/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <getopt.h>
#include <uuid/uuid.h>
#include "ctree.h"
#include "volumes.h"
#include "repair.h"
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
#include "utils.h"
#include "commands.h"
#include "free-space-cache.h"
#include "btrfsck.h"
#include "qgroup-verify.h"
#include "rbtree-utils.h"
#include "backref.h"
#include "ulist.h"
static u64 bytes_used = 0;
static u64 total_csum_bytes = 0;
static u64 total_btree_bytes = 0;
static u64 total_fs_tree_bytes = 0;
static u64 total_extent_tree_bytes = 0;
static u64 btree_space_waste = 0;
static u64 data_bytes_allocated = 0;
static u64 data_bytes_referenced = 0;
static int found_old_backref = 0;
static LIST_HEAD(duplicate_extents);
static LIST_HEAD(delete_items);
static int repair = 0;
static int no_holes = 0;
static int init_extent_tree = 0;
static int check_data_csum = 0;
struct extent_backref {
struct list_head list;
unsigned int is_data:1;
unsigned int found_extent_tree:1;
unsigned int full_backref:1;
unsigned int found_ref:1;
unsigned int broken:1;
};
struct data_backref {
struct extent_backref node;
union {
u64 parent;
u64 root;
};
u64 owner;
u64 offset;
u64 disk_bytenr;
u64 bytes;
u64 ram_bytes;
u32 num_refs;
u32 found_ref;
};
/*
* Much like data_backref, just removed the undetermined members
* and change it to use list_head.
* During extent scan, it is stored in root->orphan_data_extent.
* During fs tree scan, it is then moved to inode_rec->orphan_data_extents.
*/
struct orphan_data_extent {
struct list_head list;
u64 root;
u64 objectid;
u64 offset;
u64 disk_bytenr;
u64 disk_len;
};
struct tree_backref {
struct extent_backref node;
union {
u64 parent;
u64 root;
};
};
struct extent_record {
struct list_head backrefs;
struct list_head dups;
struct list_head list;
struct cache_extent cache;
struct btrfs_disk_key parent_key;
u64 start;
u64 max_size;
u64 nr;
u64 refs;
u64 extent_item_refs;
u64 generation;
u64 parent_generation;
u64 info_objectid;
u32 num_duplicates;
u8 info_level;
int flag_block_full_backref;
unsigned int found_rec:1;
unsigned int content_checked:1;
unsigned int owner_ref_checked:1;
unsigned int is_root:1;
unsigned int metadata:1;
unsigned int bad_full_backref:1;
};
struct inode_backref {
struct list_head list;
unsigned int found_dir_item:1;
unsigned int found_dir_index:1;
unsigned int found_inode_ref:1;
unsigned int filetype:8;
int errors;
unsigned int ref_type;
u64 dir;
u64 index;
u16 namelen;
char name[0];
};
struct root_item_record {
struct list_head list;
u64 objectid;
u64 bytenr;
u64 last_snapshot;
u8 level;
u8 drop_level;
int level_size;
struct btrfs_key drop_key;
};
#define REF_ERR_NO_DIR_ITEM (1 << 0)
#define REF_ERR_NO_DIR_INDEX (1 << 1)
#define REF_ERR_NO_INODE_REF (1 << 2)
#define REF_ERR_DUP_DIR_ITEM (1 << 3)
#define REF_ERR_DUP_DIR_INDEX (1 << 4)
#define REF_ERR_DUP_INODE_REF (1 << 5)
#define REF_ERR_INDEX_UNMATCH (1 << 6)
#define REF_ERR_FILETYPE_UNMATCH (1 << 7)
#define REF_ERR_NAME_TOO_LONG (1 << 8) // 100
#define REF_ERR_NO_ROOT_REF (1 << 9)
#define REF_ERR_NO_ROOT_BACKREF (1 << 10)
#define REF_ERR_DUP_ROOT_REF (1 << 11)
#define REF_ERR_DUP_ROOT_BACKREF (1 << 12)
struct file_extent_hole {
struct rb_node node;
u64 start;
u64 len;
};
/* Compatible function to allow reuse of old codes */
static u64 first_extent_gap(struct rb_root *holes)
{
struct file_extent_hole *hole;
if (RB_EMPTY_ROOT(holes))
return (u64)-1;
hole = rb_entry(rb_first(holes), struct file_extent_hole, node);
return hole->start;
}
int compare_hole(struct rb_node *node1, struct rb_node *node2)
{
struct file_extent_hole *hole1;
struct file_extent_hole *hole2;
hole1 = rb_entry(node1, struct file_extent_hole, node);
hole2 = rb_entry(node2, struct file_extent_hole, node);
if (hole1->start > hole2->start)
return -1;
if (hole1->start < hole2->start)
return 1;
/* Now hole1->start == hole2->start */
if (hole1->len >= hole2->len)
/*
* Hole 1 will be merge center
* Same hole will be merged later
*/
return -1;
/* Hole 2 will be merge center */
return 1;
}
/*
* Add a hole to the record
*
* This will do hole merge for copy_file_extent_holes(),
* which will ensure there won't be continuous holes.
*/
static int add_file_extent_hole(struct rb_root *holes,
u64 start, u64 len)
{
struct file_extent_hole *hole;
struct file_extent_hole *prev = NULL;
struct file_extent_hole *next = NULL;
hole = malloc(sizeof(*hole));
if (!hole)
return -ENOMEM;
hole->start = start;
hole->len = len;
/* Since compare will not return 0, no -EEXIST will happen */
rb_insert(holes, &hole->node, compare_hole);
/* simple merge with previous hole */
if (rb_prev(&hole->node))
prev = rb_entry(rb_prev(&hole->node), struct file_extent_hole,
node);
if (prev && prev->start + prev->len >= hole->start) {
hole->len = hole->start + hole->len - prev->start;
hole->start = prev->start;
rb_erase(&prev->node, holes);
free(prev);
prev = NULL;
}
/* iterate merge with next holes */
while (1) {
if (!rb_next(&hole->node))
break;
next = rb_entry(rb_next(&hole->node), struct file_extent_hole,
node);
if (hole->start + hole->len >= next->start) {
if (hole->start + hole->len <= next->start + next->len)
hole->len = next->start + next->len -
hole->start;
rb_erase(&next->node, holes);
free(next);
next = NULL;
} else
break;
}
return 0;
}
static int compare_hole_range(struct rb_node *node, void *data)
{
struct file_extent_hole *hole;
u64 start;
hole = (struct file_extent_hole *)data;
start = hole->start;
hole = rb_entry(node, struct file_extent_hole, node);
if (start < hole->start)
return -1;
if (start >= hole->start && start < hole->start + hole->len)
return 0;
return 1;
}
/*
* Delete a hole in the record
*
* This will do the hole split and is much restrict than add.
*/
static int del_file_extent_hole(struct rb_root *holes,
u64 start, u64 len)
{
struct file_extent_hole *hole;
struct file_extent_hole tmp;
u64 prev_start = 0;
u64 prev_len = 0;
u64 next_start = 0;
u64 next_len = 0;
struct rb_node *node;
int have_prev = 0;
int have_next = 0;
int ret = 0;
tmp.start = start;
tmp.len = len;
node = rb_search(holes, &tmp, compare_hole_range, NULL);
if (!node)
return -EEXIST;
hole = rb_entry(node, struct file_extent_hole, node);
if (start + len > hole->start + hole->len)
return -EEXIST;
/*
* Now there will be no overflap, delete the hole and re-add the
* split(s) if they exists.
*/
if (start > hole->start) {
prev_start = hole->start;
prev_len = start - hole->start;
have_prev = 1;
}
if (hole->start + hole->len > start + len) {
next_start = start + len;
next_len = hole->start + hole->len - start - len;
have_next = 1;
}
rb_erase(node, holes);
free(hole);
if (have_prev) {
ret = add_file_extent_hole(holes, prev_start, prev_len);
if (ret < 0)
return ret;
}
if (have_next) {
ret = add_file_extent_hole(holes, next_start, next_len);
if (ret < 0)
return ret;
}
return 0;
}
static int copy_file_extent_holes(struct rb_root *dst,
struct rb_root *src)
{
struct file_extent_hole *hole;
struct rb_node *node;
int ret = 0;
node = rb_first(src);
while (node) {
hole = rb_entry(node, struct file_extent_hole, node);
ret = add_file_extent_hole(dst, hole->start, hole->len);
if (ret)
break;
node = rb_next(node);
}
return ret;
}
static void free_file_extent_holes(struct rb_root *holes)
{
struct rb_node *node;
struct file_extent_hole *hole;
node = rb_first(holes);
while (node) {
hole = rb_entry(node, struct file_extent_hole, node);
rb_erase(node, holes);
free(hole);
node = rb_first(holes);
}
}
struct inode_record {
struct list_head backrefs;
unsigned int checked:1;
unsigned int merging:1;
unsigned int found_inode_item:1;
unsigned int found_dir_item:1;
unsigned int found_file_extent:1;
unsigned int found_csum_item:1;
unsigned int some_csum_missing:1;
unsigned int nodatasum:1;
int errors;
u64 ino;
u32 nlink;
u32 imode;
u64 isize;
u64 nbytes;
u32 found_link;
u64 found_size;
u64 extent_start;
u64 extent_end;
struct rb_root holes;
struct list_head orphan_extents;
u32 refs;
};
#define I_ERR_NO_INODE_ITEM (1 << 0)
#define I_ERR_NO_ORPHAN_ITEM (1 << 1)
#define I_ERR_DUP_INODE_ITEM (1 << 2)
#define I_ERR_DUP_DIR_INDEX (1 << 3)
#define I_ERR_ODD_DIR_ITEM (1 << 4)
#define I_ERR_ODD_FILE_EXTENT (1 << 5)
#define I_ERR_BAD_FILE_EXTENT (1 << 6)
#define I_ERR_FILE_EXTENT_OVERLAP (1 << 7)
#define I_ERR_FILE_EXTENT_DISCOUNT (1 << 8) // 100
#define I_ERR_DIR_ISIZE_WRONG (1 << 9)
#define I_ERR_FILE_NBYTES_WRONG (1 << 10) // 400
#define I_ERR_ODD_CSUM_ITEM (1 << 11)
#define I_ERR_SOME_CSUM_MISSING (1 << 12)
#define I_ERR_LINK_COUNT_WRONG (1 << 13)
#define I_ERR_FILE_EXTENT_ORPHAN (1 << 14)
struct root_backref {
struct list_head list;
unsigned int found_dir_item:1;
unsigned int found_dir_index:1;
unsigned int found_back_ref:1;
unsigned int found_forward_ref:1;
unsigned int reachable:1;
int errors;
u64 ref_root;
u64 dir;
u64 index;
u16 namelen;
char name[0];
};
struct root_record {
struct list_head backrefs;
struct cache_extent cache;
unsigned int found_root_item:1;
u64 objectid;
u32 found_ref;
};
struct ptr_node {
struct cache_extent cache;
void *data;
};
struct shared_node {
struct cache_extent cache;
struct cache_tree root_cache;
struct cache_tree inode_cache;
struct inode_record *current;
u32 refs;
};
struct block_info {
u64 start;
u32 size;
};
struct walk_control {
struct cache_tree shared;
struct shared_node *nodes[BTRFS_MAX_LEVEL];
int active_node;
int root_level;
};
struct bad_item {
struct btrfs_key key;
u64 root_id;
struct list_head list;
};
static void reset_cached_block_groups(struct btrfs_fs_info *fs_info);
static void record_root_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
if (root->last_trans != trans->transid) {
root->track_dirty = 1;
root->last_trans = trans->transid;
root->commit_root = root->node;
extent_buffer_get(root->node);
}
}
static u8 imode_to_type(u32 imode)
{
#define S_SHIFT 12
static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
[S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
[S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
[S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
[S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
[S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
[S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
};
return btrfs_type_by_mode[(imode & S_IFMT) >> S_SHIFT];
#undef S_SHIFT
}
static int device_record_compare(struct rb_node *node1, struct rb_node *node2)
{
struct device_record *rec1;
struct device_record *rec2;
rec1 = rb_entry(node1, struct device_record, node);
rec2 = rb_entry(node2, struct device_record, node);
if (rec1->devid > rec2->devid)
return -1;
else if (rec1->devid < rec2->devid)
return 1;
else
return 0;
}
static struct inode_record *clone_inode_rec(struct inode_record *orig_rec)
{
struct inode_record *rec;
struct inode_backref *backref;
struct inode_backref *orig;
struct orphan_data_extent *src_orphan;
struct orphan_data_extent *dst_orphan;
size_t size;
int ret;
rec = malloc(sizeof(*rec));
memcpy(rec, orig_rec, sizeof(*rec));
rec->refs = 1;
INIT_LIST_HEAD(&rec->backrefs);
INIT_LIST_HEAD(&rec->orphan_extents);
rec->holes = RB_ROOT;
list_for_each_entry(orig, &orig_rec->backrefs, list) {
size = sizeof(*orig) + orig->namelen + 1;
backref = malloc(size);
memcpy(backref, orig, size);
list_add_tail(&backref->list, &rec->backrefs);
}
list_for_each_entry(src_orphan, &orig_rec->orphan_extents, list) {
dst_orphan = malloc(sizeof(*dst_orphan));
/* TODO: Fix all the HELL of un-catched -ENOMEM case */
BUG_ON(!dst_orphan);
memcpy(dst_orphan, src_orphan, sizeof(*src_orphan));
list_add_tail(&dst_orphan->list, &rec->orphan_extents);
}
ret = copy_file_extent_holes(&rec->holes, &orig_rec->holes);
BUG_ON(ret < 0);
return rec;
}
static void print_orphan_data_extents(struct list_head *orphan_extents,
u64 objectid)
{
struct orphan_data_extent *orphan;
if (list_empty(orphan_extents))
return;
printf("The following data extent is lost in tree %llu:\n",
objectid);
list_for_each_entry(orphan, orphan_extents, list) {
printf("\tinode: %llu, offset:%llu, disk_bytenr: %llu, disk_len: %llu\n",
orphan->objectid, orphan->offset, orphan->disk_bytenr,
orphan->disk_len);
}
}
static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
{
u64 root_objectid = root->root_key.objectid;
int errors = rec->errors;
if (!errors)
return;
/* reloc root errors, we print its corresponding fs root objectid*/
if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) {
root_objectid = root->root_key.offset;
fprintf(stderr, "reloc");
}
fprintf(stderr, "root %llu inode %llu errors %x",
(unsigned long long) root_objectid,
(unsigned long long) rec->ino, rec->errors);
if (errors & I_ERR_NO_INODE_ITEM)
fprintf(stderr, ", no inode item");
if (errors & I_ERR_NO_ORPHAN_ITEM)
fprintf(stderr, ", no orphan item");
if (errors & I_ERR_DUP_INODE_ITEM)
fprintf(stderr, ", dup inode item");
if (errors & I_ERR_DUP_DIR_INDEX)
fprintf(stderr, ", dup dir index");
if (errors & I_ERR_ODD_DIR_ITEM)
fprintf(stderr, ", odd dir item");
if (errors & I_ERR_ODD_FILE_EXTENT)
fprintf(stderr, ", odd file extent");
if (errors & I_ERR_BAD_FILE_EXTENT)
fprintf(stderr, ", bad file extent");
if (errors & I_ERR_FILE_EXTENT_OVERLAP)
fprintf(stderr, ", file extent overlap");
if (errors & I_ERR_FILE_EXTENT_DISCOUNT)
fprintf(stderr, ", file extent discount");
if (errors & I_ERR_DIR_ISIZE_WRONG)
fprintf(stderr, ", dir isize wrong");
if (errors & I_ERR_FILE_NBYTES_WRONG)
fprintf(stderr, ", nbytes wrong");
if (errors & I_ERR_ODD_CSUM_ITEM)
fprintf(stderr, ", odd csum item");
if (errors & I_ERR_SOME_CSUM_MISSING)
fprintf(stderr, ", some csum missing");
if (errors & I_ERR_LINK_COUNT_WRONG)
fprintf(stderr, ", link count wrong");
if (errors & I_ERR_FILE_EXTENT_ORPHAN)
fprintf(stderr, ", orphan file extent");
fprintf(stderr, "\n");
/* Print the orphan extents if needed */
if (errors & I_ERR_FILE_EXTENT_ORPHAN)
print_orphan_data_extents(&rec->orphan_extents, root->objectid);
/* Print the holes if needed */
if (errors & I_ERR_FILE_EXTENT_DISCOUNT) {
struct file_extent_hole *hole;
struct rb_node *node;
node = rb_first(&rec->holes);
fprintf(stderr, "Found file extent holes:\n");
while (node) {
hole = rb_entry(node, struct file_extent_hole, node);
fprintf(stderr, "\tstart: %llu, len:%llu\n",
hole->start, hole->len);
node = rb_next(node);
}
}
}
static void print_ref_error(int errors)
{
if (errors & REF_ERR_NO_DIR_ITEM)
fprintf(stderr, ", no dir item");
if (errors & REF_ERR_NO_DIR_INDEX)
fprintf(stderr, ", no dir index");
if (errors & REF_ERR_NO_INODE_REF)
fprintf(stderr, ", no inode ref");
if (errors & REF_ERR_DUP_DIR_ITEM)
fprintf(stderr, ", dup dir item");
if (errors & REF_ERR_DUP_DIR_INDEX)
fprintf(stderr, ", dup dir index");
if (errors & REF_ERR_DUP_INODE_REF)
fprintf(stderr, ", dup inode ref");
if (errors & REF_ERR_INDEX_UNMATCH)
fprintf(stderr, ", index unmatch");
if (errors & REF_ERR_FILETYPE_UNMATCH)
fprintf(stderr, ", filetype unmatch");
if (errors & REF_ERR_NAME_TOO_LONG)
fprintf(stderr, ", name too long");
if (errors & REF_ERR_NO_ROOT_REF)
fprintf(stderr, ", no root ref");
if (errors & REF_ERR_NO_ROOT_BACKREF)
fprintf(stderr, ", no root backref");
if (errors & REF_ERR_DUP_ROOT_REF)
fprintf(stderr, ", dup root ref");
if (errors & REF_ERR_DUP_ROOT_BACKREF)
fprintf(stderr, ", dup root backref");
fprintf(stderr, "\n");
}
static struct inode_record *get_inode_rec(struct cache_tree *inode_cache,
u64 ino, int mod)
{
struct ptr_node *node;
struct cache_extent *cache;
struct inode_record *rec = NULL;
int ret;
cache = lookup_cache_extent(inode_cache, ino, 1);
if (cache) {
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
if (mod && rec->refs > 1) {
node->data = clone_inode_rec(rec);
rec->refs--;
rec = node->data;
}
} else if (mod) {
rec = calloc(1, sizeof(*rec));
rec->ino = ino;
rec->extent_start = (u64)-1;
rec->refs = 1;
INIT_LIST_HEAD(&rec->backrefs);
INIT_LIST_HEAD(&rec->orphan_extents);
rec->holes = RB_ROOT;
node = malloc(sizeof(*node));
node->cache.start = ino;
node->cache.size = 1;
node->data = rec;
if (ino == BTRFS_FREE_INO_OBJECTID)
rec->found_link = 1;
ret = insert_cache_extent(inode_cache, &node->cache);
BUG_ON(ret);
}
return rec;
}
static void free_orphan_data_extents(struct list_head *orphan_extents)
{
struct orphan_data_extent *orphan;
while (!list_empty(orphan_extents)) {
orphan = list_entry(orphan_extents->next,
struct orphan_data_extent, list);
list_del(&orphan->list);
free(orphan);
}
}
static void free_inode_rec(struct inode_record *rec)
{
struct inode_backref *backref;
if (--rec->refs > 0)
return;
while (!list_empty(&rec->backrefs)) {
backref = list_entry(rec->backrefs.next,
struct inode_backref, list);
list_del(&backref->list);
free(backref);
}
free_orphan_data_extents(&rec->orphan_extents);
free_file_extent_holes(&rec->holes);
free(rec);
}
static int can_free_inode_rec(struct inode_record *rec)
{
if (!rec->errors && rec->checked && rec->found_inode_item &&
rec->nlink == rec->found_link && list_empty(&rec->backrefs))
return 1;
return 0;
}
static void maybe_free_inode_rec(struct cache_tree *inode_cache,
struct inode_record *rec)
{
struct cache_extent *cache;
struct inode_backref *tmp, *backref;
struct ptr_node *node;
unsigned char filetype;
if (!rec->found_inode_item)
return;
filetype = imode_to_type(rec->imode);
list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) {
if (backref->found_dir_item && backref->found_dir_index) {
if (backref->filetype != filetype)
backref->errors |= REF_ERR_FILETYPE_UNMATCH;
if (!backref->errors && backref->found_inode_ref) {
list_del(&backref->list);
free(backref);
}
}
}
if (!rec->checked || rec->merging)
return;
if (S_ISDIR(rec->imode)) {
if (rec->found_size != rec->isize)
rec->errors |= I_ERR_DIR_ISIZE_WRONG;
if (rec->found_file_extent)
rec->errors |= I_ERR_ODD_FILE_EXTENT;
} else if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) {
if (rec->found_dir_item)
rec->errors |= I_ERR_ODD_DIR_ITEM;
if (rec->found_size != rec->nbytes)
rec->errors |= I_ERR_FILE_NBYTES_WRONG;
if (rec->nlink > 0 && !no_holes &&
(rec->extent_end < rec->isize ||
first_extent_gap(&rec->holes) < rec->isize))
rec->errors |= I_ERR_FILE_EXTENT_DISCOUNT;
}
if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) {
if (rec->found_csum_item && rec->nodatasum)
rec->errors |= I_ERR_ODD_CSUM_ITEM;
if (rec->some_csum_missing && !rec->nodatasum)
rec->errors |= I_ERR_SOME_CSUM_MISSING;
}
BUG_ON(rec->refs != 1);
if (can_free_inode_rec(rec)) {
cache = lookup_cache_extent(inode_cache, rec->ino, 1);
node = container_of(cache, struct ptr_node, cache);
BUG_ON(node->data != rec);
remove_cache_extent(inode_cache, &node->cache);
free(node);
free_inode_rec(rec);
}
}
static int check_orphan_item(struct btrfs_root *root, u64 ino)
{
struct btrfs_path path;
struct btrfs_key key;
int ret;
key.objectid = BTRFS_ORPHAN_OBJECTID;
key.type = BTRFS_ORPHAN_ITEM_KEY;
key.offset = ino;
btrfs_init_path(&path);
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
btrfs_release_path(&path);
if (ret > 0)
ret = -ENOENT;
return ret;
}
static int process_inode_item(struct extent_buffer *eb,
int slot, struct btrfs_key *key,
struct shared_node *active_node)
{
struct inode_record *rec;
struct btrfs_inode_item *item;
rec = active_node->current;
BUG_ON(rec->ino != key->objectid || rec->refs > 1);
if (rec->found_inode_item) {
rec->errors |= I_ERR_DUP_INODE_ITEM;
return 1;
}
item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item);
rec->nlink = btrfs_inode_nlink(eb, item);
rec->isize = btrfs_inode_size(eb, item);
rec->nbytes = btrfs_inode_nbytes(eb, item);
rec->imode = btrfs_inode_mode(eb, item);
if (btrfs_inode_flags(eb, item) & BTRFS_INODE_NODATASUM)
rec->nodatasum = 1;
rec->found_inode_item = 1;
if (rec->nlink == 0)
rec->errors |= I_ERR_NO_ORPHAN_ITEM;
maybe_free_inode_rec(&active_node->inode_cache, rec);
return 0;
}
static struct inode_backref *get_inode_backref(struct inode_record *rec,
const char *name,
int namelen, u64 dir)
{
struct inode_backref *backref;
list_for_each_entry(backref, &rec->backrefs, list) {
if (rec->ino == BTRFS_MULTIPLE_OBJECTIDS)
break;
if (backref->dir != dir || backref->namelen != namelen)
continue;
if (memcmp(name, backref->name, namelen))
continue;
return backref;
}
backref = malloc(sizeof(*backref) + namelen + 1);
memset(backref, 0, sizeof(*backref));
backref->dir = dir;
backref->namelen = namelen;
memcpy(backref->name, name, namelen);
backref->name[namelen] = '\0';
list_add_tail(&backref->list, &rec->backrefs);
return backref;
}
static int add_inode_backref(struct cache_tree *inode_cache,
u64 ino, u64 dir, u64 index,
const char *name, int namelen,
int filetype, int itemtype, int errors)
{
struct inode_record *rec;
struct inode_backref *backref;
rec = get_inode_rec(inode_cache, ino, 1);
backref = get_inode_backref(rec, name, namelen, dir);
if (errors)
backref->errors |= errors;
if (itemtype == BTRFS_DIR_INDEX_KEY) {
if (backref->found_dir_index)
backref->errors |= REF_ERR_DUP_DIR_INDEX;
if (backref->found_inode_ref && backref->index != index)
backref->errors |= REF_ERR_INDEX_UNMATCH;
if (backref->found_dir_item && backref->filetype != filetype)
backref->errors |= REF_ERR_FILETYPE_UNMATCH;
backref->index = index;
backref->filetype = filetype;
backref->found_dir_index = 1;
} else if (itemtype == BTRFS_DIR_ITEM_KEY) {
rec->found_link++;
if (backref->found_dir_item)
backref->errors |= REF_ERR_DUP_DIR_ITEM;
if (backref->found_dir_index && backref->filetype != filetype)
backref->errors |= REF_ERR_FILETYPE_UNMATCH;
backref->filetype = filetype;
backref->found_dir_item = 1;
} else if ((itemtype == BTRFS_INODE_REF_KEY) ||
(itemtype == BTRFS_INODE_EXTREF_KEY)) {
if (backref->found_inode_ref)
backref->errors |= REF_ERR_DUP_INODE_REF;
if (backref->found_dir_index && backref->index != index)
backref->errors |= REF_ERR_INDEX_UNMATCH;
else
backref->index = index;
backref->ref_type = itemtype;
backref->found_inode_ref = 1;
} else {
BUG_ON(1);
}
maybe_free_inode_rec(inode_cache, rec);
return 0;
}
static int merge_inode_recs(struct inode_record *src, struct inode_record *dst,
struct cache_tree *dst_cache)
{
struct inode_backref *backref;
u32 dir_count = 0;
int ret = 0;
dst->merging = 1;
list_for_each_entry(backref, &src->backrefs, list) {
if (backref->found_dir_index) {
add_inode_backref(dst_cache, dst->ino, backref->dir,
backref->index, backref->name,
backref->namelen, backref->filetype,
BTRFS_DIR_INDEX_KEY, backref->errors);
}
if (backref->found_dir_item) {
dir_count++;
add_inode_backref(dst_cache, dst->ino,
backref->dir, 0, backref->name,
backref->namelen, backref->filetype,
BTRFS_DIR_ITEM_KEY, backref->errors);
}
if (backref->found_inode_ref) {
add_inode_backref(dst_cache, dst->ino,
backref->dir, backref->index,
backref->name, backref->namelen, 0,
backref->ref_type, backref->errors);
}
}
if (src->found_dir_item)
dst->found_dir_item = 1;
if (src->found_file_extent)
dst->found_file_extent = 1;
if (src->found_csum_item)
dst->found_csum_item = 1;
if (src->some_csum_missing)
dst->some_csum_missing = 1;
if (first_extent_gap(&dst->holes) > first_extent_gap(&src->holes)) {
ret = copy_file_extent_holes(&dst->holes, &src->holes);
if (ret < 0)
return ret;
}
BUG_ON(src->found_link < dir_count);
dst->found_link += src->found_link - dir_count;
dst->found_size += src->found_size;
if (src->extent_start != (u64)-1) {
if (dst->extent_start == (u64)-1) {
dst->extent_start = src->extent_start;
dst->extent_end = src->extent_end;
} else {
if (dst->extent_end > src->extent_start)
dst->errors |= I_ERR_FILE_EXTENT_OVERLAP;
else if (dst->extent_end < src->extent_start) {
ret = add_file_extent_hole(&dst->holes,
dst->extent_end,
src->extent_start - dst->extent_end);
}
if (dst->extent_end < src->extent_end)
dst->extent_end = src->extent_end;
}
}
dst->errors |= src->errors;
if (src->found_inode_item) {
if (!dst->found_inode_item) {
dst->nlink = src->nlink;
dst->isize = src->isize;
dst->nbytes = src->nbytes;
dst->imode = src->imode;
dst->nodatasum = src->nodatasum;
dst->found_inode_item = 1;
} else {
dst->errors |= I_ERR_DUP_INODE_ITEM;
}
}
dst->merging = 0;
return 0;
}
static int splice_shared_node(struct shared_node *src_node,
struct shared_node *dst_node)
{
struct cache_extent *cache;
struct ptr_node *node, *ins;
struct cache_tree *src, *dst;
struct inode_record *rec, *conflict;
u64 current_ino = 0;
int splice = 0;
int ret;
if (--src_node->refs == 0)
splice = 1;
if (src_node->current)
current_ino = src_node->current->ino;
src = &src_node->root_cache;
dst = &dst_node->root_cache;
again:
cache = search_cache_extent(src, 0);
while (cache) {
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
cache = next_cache_extent(cache);
if (splice) {
remove_cache_extent(src, &node->cache);
ins = node;
} else {
ins = malloc(sizeof(*ins));
ins->cache.start = node->cache.start;
ins->cache.size = node->cache.size;
ins->data = rec;
rec->refs++;
}
ret = insert_cache_extent(dst, &ins->cache);
if (ret == -EEXIST) {
conflict = get_inode_rec(dst, rec->ino, 1);
merge_inode_recs(rec, conflict, dst);
if (rec->checked) {
conflict->checked = 1;
if (dst_node->current == conflict)
dst_node->current = NULL;
}
maybe_free_inode_rec(dst, conflict);
free_inode_rec(rec);
free(ins);
} else {
BUG_ON(ret);
}
}
if (src == &src_node->root_cache) {
src = &src_node->inode_cache;
dst = &dst_node->inode_cache;
goto again;
}
if (current_ino > 0 && (!dst_node->current ||
current_ino > dst_node->current->ino)) {
if (dst_node->current) {
dst_node->current->checked = 1;
maybe_free_inode_rec(dst, dst_node->current);
}
dst_node->current = get_inode_rec(dst, current_ino, 1);
}
return 0;
}
static void free_inode_ptr(struct cache_extent *cache)
{
struct ptr_node *node;
struct inode_record *rec;
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
free_inode_rec(rec);
free(node);
}
FREE_EXTENT_CACHE_BASED_TREE(inode_recs, free_inode_ptr);
static struct shared_node *find_shared_node(struct cache_tree *shared,
u64 bytenr)
{
struct cache_extent *cache;
struct shared_node *node;
cache = lookup_cache_extent(shared, bytenr, 1);
if (cache) {
node = container_of(cache, struct shared_node, cache);
return node;
}
return NULL;
}
static int add_shared_node(struct cache_tree *shared, u64 bytenr, u32 refs)
{
int ret;
struct shared_node *node;
node = calloc(1, sizeof(*node));
node->cache.start = bytenr;
node->cache.size = 1;
cache_tree_init(&node->root_cache);
cache_tree_init(&node->inode_cache);
node->refs = refs;
ret = insert_cache_extent(shared, &node->cache);
BUG_ON(ret);
return 0;
}
static int enter_shared_node(struct btrfs_root *root, u64 bytenr, u32 refs,
struct walk_control *wc, int level)
{
struct shared_node *node;
struct shared_node *dest;
if (level == wc->active_node)
return 0;
BUG_ON(wc->active_node <= level);
node = find_shared_node(&wc->shared, bytenr);
if (!node) {
add_shared_node(&wc->shared, bytenr, refs);
node = find_shared_node(&wc->shared, bytenr);
wc->nodes[level] = node;
wc->active_node = level;
return 0;
}
if (wc->root_level == wc->active_node &&
btrfs_root_refs(&root->root_item) == 0) {
if (--node->refs == 0) {
free_inode_recs_tree(&node->root_cache);
free_inode_recs_tree(&node->inode_cache);
remove_cache_extent(&wc->shared, &node->cache);
free(node);
}
return 1;
}
dest = wc->nodes[wc->active_node];
splice_shared_node(node, dest);
if (node->refs == 0) {
remove_cache_extent(&wc->shared, &node->cache);
free(node);
}
return 1;
}
static int leave_shared_node(struct btrfs_root *root,
struct walk_control *wc, int level)
{
struct shared_node *node;
struct shared_node *dest;
int i;
if (level == wc->root_level)
return 0;
for (i = level + 1; i < BTRFS_MAX_LEVEL; i++) {
if (wc->nodes[i])
break;
}
BUG_ON(i >= BTRFS_MAX_LEVEL);
node = wc->nodes[wc->active_node];
wc->nodes[wc->active_node] = NULL;
wc->active_node = i;
dest = wc->nodes[wc->active_node];
if (wc->active_node < wc->root_level ||
btrfs_root_refs(&root->root_item) > 0) {
BUG_ON(node->refs <= 1);
splice_shared_node(node, dest);
} else {
BUG_ON(node->refs < 2);
node->refs--;
}
return 0;
}
/*
* Returns:
* < 0 - on error
* 1 - if the root with id child_root_id is a child of root parent_root_id
* 0 - if the root child_root_id isn't a child of the root parent_root_id but
* has other root(s) as parent(s)
* 2 - if the root child_root_id doesn't have any parent roots
*/
static int is_child_root(struct btrfs_root *root, u64 parent_root_id,
u64 child_root_id)
{
struct btrfs_path path;
struct btrfs_key key;
struct extent_buffer *leaf;
int has_parent = 0;
int ret;
btrfs_init_path(&path);
key.objectid = parent_root_id;
key.type = BTRFS_ROOT_REF_KEY;
key.offset = child_root_id;
ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path,
0, 0);
if (ret < 0)
return ret;
btrfs_release_path(&path);
if (!ret)
return 1;
key.objectid = child_root_id;
key.type = BTRFS_ROOT_BACKREF_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path,
0, 0);
if (ret < 0)
goto out;
while (1) {
leaf = path.nodes[0];
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root->fs_info->tree_root, &path);
if (ret)
break;
leaf = path.nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
if (key.objectid != child_root_id ||
key.type != BTRFS_ROOT_BACKREF_KEY)
break;
has_parent = 1;
if (key.offset == parent_root_id) {
btrfs_release_path(&path);
return 1;
}
path.slots[0]++;
}
out:
btrfs_release_path(&path);
if (ret < 0)
return ret;
return has_parent ? 0 : 2;
}
static int process_dir_item(struct btrfs_root *root,
struct extent_buffer *eb,
int slot, struct btrfs_key *key,
struct shared_node *active_node)
{
u32 total;
u32 cur = 0;
u32 len;
u32 name_len;
u32 data_len;
int error;
int nritems = 0;
int filetype;
struct btrfs_dir_item *di;
struct inode_record *rec;
struct cache_tree *root_cache;
struct cache_tree *inode_cache;
struct btrfs_key location;
char namebuf[BTRFS_NAME_LEN];
root_cache = &active_node->root_cache;
inode_cache = &active_node->inode_cache;
rec = active_node->current;
rec->found_dir_item = 1;
di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
total = btrfs_item_size_nr(eb, slot);
while (cur < total) {
nritems++;
btrfs_dir_item_key_to_cpu(eb, di, &location);
name_len = btrfs_dir_name_len(eb, di);
data_len = btrfs_dir_data_len(eb, di);
filetype = btrfs_dir_type(eb, di);
rec->found_size += name_len;
if (name_len <= BTRFS_NAME_LEN) {
len = name_len;
error = 0;
} else {
len = BTRFS_NAME_LEN;
error = REF_ERR_NAME_TOO_LONG;
}
read_extent_buffer(eb, namebuf, (unsigned long)(di + 1), len);
if (location.type == BTRFS_INODE_ITEM_KEY) {
add_inode_backref(inode_cache, location.objectid,
key->objectid, key->offset, namebuf,
len, filetype, key->type, error);
} else if (location.type == BTRFS_ROOT_ITEM_KEY) {
add_inode_backref(root_cache, location.objectid,
key->objectid, key->offset,
namebuf, len, filetype,
key->type, error);
} else {
fprintf(stderr, "invalid location in dir item %u\n",
location.type);
add_inode_backref(inode_cache, BTRFS_MULTIPLE_OBJECTIDS,
key->objectid, key->offset, namebuf,
len, filetype, key->type, error);
}
len = sizeof(*di) + name_len + data_len;
di = (struct btrfs_dir_item *)((char *)di + len);
cur += len;
}
if (key->type == BTRFS_DIR_INDEX_KEY && nritems > 1)
rec->errors |= I_ERR_DUP_DIR_INDEX;
return 0;
}
static int process_inode_ref(struct extent_buffer *eb,
int slot, struct btrfs_key *key,
struct shared_node *active_node)
{
u32 total;
u32 cur = 0;
u32 len;
u32 name_len;
u64 index;
int error;
struct cache_tree *inode_cache;
struct btrfs_inode_ref *ref;
char namebuf[BTRFS_NAME_LEN];
inode_cache = &active_node->inode_cache;
ref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);
total = btrfs_item_size_nr(eb, slot);
while (cur < total) {
name_len = btrfs_inode_ref_name_len(eb, ref);
index = btrfs_inode_ref_index(eb, ref);
if (name_len <= BTRFS_NAME_LEN) {
len = name_len;
error = 0;
} else {
len = BTRFS_NAME_LEN;
error = REF_ERR_NAME_TOO_LONG;
}
read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len);
add_inode_backref(inode_cache, key->objectid, key->offset,
index, namebuf, len, 0, key->type, error);
len = sizeof(*ref) + name_len;
ref = (struct btrfs_inode_ref *)((char *)ref + len);
cur += len;
}
return 0;
}
static int process_inode_extref(struct extent_buffer *eb,
int slot, struct btrfs_key *key,
struct shared_node *active_node)
{
u32 total;
u32 cur = 0;
u32 len;
u32 name_len;
u64 index;
u64 parent;
int error;
struct cache_tree *inode_cache;
struct btrfs_inode_extref *extref;
char namebuf[BTRFS_NAME_LEN];
inode_cache = &active_node->inode_cache;
extref = btrfs_item_ptr(eb, slot, struct btrfs_inode_extref);
total = btrfs_item_size_nr(eb, slot);
while (cur < total) {
name_len = btrfs_inode_extref_name_len(eb, extref);
index = btrfs_inode_extref_index(eb, extref);
parent = btrfs_inode_extref_parent(eb, extref);
if (name_len <= BTRFS_NAME_LEN) {
len = name_len;
error = 0;
} else {
len = BTRFS_NAME_LEN;
error = REF_ERR_NAME_TOO_LONG;
}
read_extent_buffer(eb, namebuf,
(unsigned long)(extref + 1), len);
add_inode_backref(inode_cache, key->objectid, parent,
index, namebuf, len, 0, key->type, error);
len = sizeof(*extref) + name_len;
extref = (struct btrfs_inode_extref *)((char *)extref + len);
cur += len;
}
return 0;
}
static int count_csum_range(struct btrfs_root *root, u64 start,
u64 len, u64 *found)
{
struct btrfs_key key;
struct btrfs_path path;
struct extent_buffer *leaf;
int ret;
size_t size;
*found = 0;
u64 csum_end;
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
btrfs_init_path(&path);
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
key.offset = start;
key.type = BTRFS_EXTENT_CSUM_KEY;
ret = btrfs_search_slot(NULL, root->fs_info->csum_root,
&key, &path, 0, 0);
if (ret < 0)
goto out;
if (ret > 0 && path.slots[0] > 0) {
leaf = path.nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path.slots[0] - 1);
if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
key.type == BTRFS_EXTENT_CSUM_KEY)
path.slots[0]--;
}
while (len > 0) {
leaf = path.nodes[0];
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root->fs_info->csum_root, &path);
if (ret > 0)
break;
else if (ret < 0)
goto out;
leaf = path.nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
key.type != BTRFS_EXTENT_CSUM_KEY)
break;
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
if (key.offset >= start + len)
break;
if (key.offset > start)
start = key.offset;
size = btrfs_item_size_nr(leaf, path.slots[0]);
csum_end = key.offset + (size / csum_size) * root->sectorsize;
if (csum_end > start) {
size = min(csum_end - start, len);
len -= size;
start += size;
*found += size;
}
path.slots[0]++;
}
out:
btrfs_release_path(&path);
if (ret < 0)
return ret;
return 0;
}
static int process_file_extent(struct btrfs_root *root,
struct extent_buffer *eb,
int slot, struct btrfs_key *key,
struct shared_node *active_node)
{
struct inode_record *rec;
struct btrfs_file_extent_item *fi;
u64 num_bytes = 0;
u64 disk_bytenr = 0;
u64 extent_offset = 0;
u64 mask = root->sectorsize - 1;
int extent_type;
int ret;
rec = active_node->current;
BUG_ON(rec->ino != key->objectid || rec->refs > 1);
rec->found_file_extent = 1;
if (rec->extent_start == (u64)-1) {
rec->extent_start = key->offset;
rec->extent_end = key->offset;
}
if (rec->extent_end > key->offset)
rec->errors |= I_ERR_FILE_EXTENT_OVERLAP;
else if (rec->extent_end < key->offset) {
ret = add_file_extent_hole(&rec->holes, rec->extent_end,
key->offset - rec->extent_end);
if (ret < 0)
return ret;
}
fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
extent_type = btrfs_file_extent_type(eb, fi);
if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
num_bytes = btrfs_file_extent_inline_len(eb, slot, fi);
if (num_bytes == 0)
rec->errors |= I_ERR_BAD_FILE_EXTENT;
rec->found_size += num_bytes;
num_bytes = (num_bytes + mask) & ~mask;
} else if (extent_type == BTRFS_FILE_EXTENT_REG ||
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
num_bytes = btrfs_file_extent_num_bytes(eb, fi);
disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
extent_offset = btrfs_file_extent_offset(eb, fi);
if (num_bytes == 0 || (num_bytes & mask))
rec->errors |= I_ERR_BAD_FILE_EXTENT;
if (num_bytes + extent_offset >
btrfs_file_extent_ram_bytes(eb, fi))
rec->errors |= I_ERR_BAD_FILE_EXTENT;
if (extent_type == BTRFS_FILE_EXTENT_PREALLOC &&
(btrfs_file_extent_compression(eb, fi) ||
btrfs_file_extent_encryption(eb, fi) ||
btrfs_file_extent_other_encoding(eb, fi)))
rec->errors |= I_ERR_BAD_FILE_EXTENT;
if (disk_bytenr > 0)
rec->found_size += num_bytes;
} else {
rec->errors |= I_ERR_BAD_FILE_EXTENT;
}
rec->extent_end = key->offset + num_bytes;
/*
* The data reloc tree will copy full extents into its inode and then
* copy the corresponding csums. Because the extent it copied could be
* a preallocated extent that hasn't been written to yet there may be no
* csums to copy, ergo we won't have csums for our file extent. This is
* ok so just don't bother checking csums if the inode belongs to the
* data reloc tree.
*/
if (disk_bytenr > 0 &&
btrfs_header_owner(eb) != BTRFS_DATA_RELOC_TREE_OBJECTID) {
u64 found;
if (btrfs_file_extent_compression(eb, fi))
num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
else
disk_bytenr += extent_offset;
ret = count_csum_range(root, disk_bytenr, num_bytes, &found);
if (ret < 0)
return ret;
if (extent_type == BTRFS_FILE_EXTENT_REG) {
if (found > 0)
rec->found_csum_item = 1;
if (found < num_bytes)
rec->some_csum_missing = 1;
} else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
if (found > 0)
rec->errors |= I_ERR_ODD_CSUM_ITEM;
}
}
return 0;
}
static int process_one_leaf(struct btrfs_root *root, struct extent_buffer *eb,
struct walk_control *wc)
{
struct btrfs_key key;
u32 nritems;
int i;
int ret = 0;
struct cache_tree *inode_cache;
struct shared_node *active_node;
if (wc->root_level == wc->active_node &&
btrfs_root_refs(&root->root_item) == 0)
return 0;
active_node = wc->nodes[wc->active_node];
inode_cache = &active_node->inode_cache;
nritems = btrfs_header_nritems(eb);
for (i = 0; i < nritems; i++) {
btrfs_item_key_to_cpu(eb, &key, i);
if (key.objectid == BTRFS_FREE_SPACE_OBJECTID)
continue;
if (key.type == BTRFS_ORPHAN_ITEM_KEY)
continue;
if (active_node->current == NULL ||
active_node->current->ino < key.objectid) {
if (active_node->current) {
active_node->current->checked = 1;
maybe_free_inode_rec(inode_cache,
active_node->current);
}
active_node->current = get_inode_rec(inode_cache,
key.objectid, 1);
}
switch (key.type) {
case BTRFS_DIR_ITEM_KEY:
case BTRFS_DIR_INDEX_KEY:
ret = process_dir_item(root, eb, i, &key, active_node);
break;
case BTRFS_INODE_REF_KEY:
ret = process_inode_ref(eb, i, &key, active_node);
break;
case BTRFS_INODE_EXTREF_KEY:
ret = process_inode_extref(eb, i, &key, active_node);
break;
case BTRFS_INODE_ITEM_KEY:
ret = process_inode_item(eb, i, &key, active_node);
break;
case BTRFS_EXTENT_DATA_KEY:
ret = process_file_extent(root, eb, i, &key,
active_node);
break;
default:
break;
};
}
return ret;
}
static void reada_walk_down(struct btrfs_root *root,
struct extent_buffer *node, int slot)
{
u64 bytenr;
u64 ptr_gen;
u32 nritems;
u32 blocksize;
int i;
int level;
level = btrfs_header_level(node);
if (level != 1)
return;
nritems = btrfs_header_nritems(node);
blocksize = btrfs_level_size(root, level - 1);
for (i = slot; i < nritems; i++) {
bytenr = btrfs_node_blockptr(node, i);
ptr_gen = btrfs_node_ptr_generation(node, i);
readahead_tree_block(root, bytenr, blocksize, ptr_gen);
}
}
/*
* Check the child node/leaf by the following condition:
* 1. the first item key of the node/leaf should be the same with the one
* in parent.
* 2. block in parent node should match the child node/leaf.
* 3. generation of parent node and child's header should be consistent.
*
* Or the child node/leaf pointed by the key in parent is not valid.
*
* We hope to check leaf owner too, but since subvol may share leaves,
* which makes leaf owner check not so strong, key check should be
* sufficient enough for that case.
*/
static int check_child_node(struct btrfs_root *root,
struct extent_buffer *parent, int slot,
struct extent_buffer *child)
{
struct btrfs_key parent_key;
struct btrfs_key child_key;
int ret = 0;
btrfs_node_key_to_cpu(parent, &parent_key, slot);
if (btrfs_header_level(child) == 0)
btrfs_item_key_to_cpu(child, &child_key, 0);
else
btrfs_node_key_to_cpu(child, &child_key, 0);
if (memcmp(&parent_key, &child_key, sizeof(parent_key))) {
ret = -EINVAL;
fprintf(stderr,
"Wrong key of child node/leaf, wanted: (%llu, %u, %llu), have: (%llu, %u, %llu)\n",
parent_key.objectid, parent_key.type, parent_key.offset,
child_key.objectid, child_key.type, child_key.offset);
}
if (btrfs_header_bytenr(child) != btrfs_node_blockptr(parent, slot)) {
ret = -EINVAL;
fprintf(stderr, "Wrong block of child node/leaf, wanted: %llu, have: %llu\n",
btrfs_node_blockptr(parent, slot),
btrfs_header_bytenr(child));
}
if (btrfs_node_ptr_generation(parent, slot) !=
btrfs_header_generation(child)) {
ret = -EINVAL;
fprintf(stderr, "Wrong generation of child node/leaf, wanted: %llu, have: %llu\n",
btrfs_header_generation(child),
btrfs_node_ptr_generation(parent, slot));
}
return ret;
}
static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path,
struct walk_control *wc, int *level)
{
enum btrfs_tree_block_status status;
u64 bytenr;
u64 ptr_gen;
struct extent_buffer *next;
struct extent_buffer *cur;
u32 blocksize;
int ret, err = 0;
u64 refs;
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
ret = btrfs_lookup_extent_info(NULL, root,
path->nodes[*level]->start,
*level, 1, &refs, NULL);
if (ret < 0) {
err = ret;
goto out;
}
if (refs > 1) {
ret = enter_shared_node(root, path->nodes[*level]->start,
refs, wc, *level);
if (ret > 0) {
err = ret;
goto out;
}
}
while (*level >= 0) {
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
cur = path->nodes[*level];
if (btrfs_header_level(cur) != *level)
WARN_ON(1);
if (path->slots[*level] >= btrfs_header_nritems(cur))
break;
if (*level == 0) {
ret = process_one_leaf(root, cur, wc);
if (ret < 0)
err = ret;
break;
}
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
blocksize = btrfs_level_size(root, *level - 1);
ret = btrfs_lookup_extent_info(NULL, root, bytenr, *level - 1,
1, &refs, NULL);
if (ret < 0)
refs = 0;
if (refs > 1) {
ret = enter_shared_node(root, bytenr, refs,
wc, *level - 1);
if (ret > 0) {
path->slots[*level]++;
continue;
}
}
next = btrfs_find_tree_block(root, bytenr, blocksize);
if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
free_extent_buffer(next);
reada_walk_down(root, cur, path->slots[*level]);
next = read_tree_block(root, bytenr, blocksize,
ptr_gen);
if (!extent_buffer_uptodate(next)) {
struct btrfs_key node_key;
btrfs_node_key_to_cpu(path->nodes[*level],
&node_key,
path->slots[*level]);
btrfs_add_corrupt_extent_record(root->fs_info,
&node_key,
path->nodes[*level]->start,
root->leafsize, *level);
err = -EIO;
goto out;
}
}
ret = check_child_node(root, cur, path->slots[*level], next);
if (ret) {
err = ret;
goto out;
}
if (btrfs_is_leaf(next))
status = btrfs_check_leaf(root, NULL, next);
else
status = btrfs_check_node(root, NULL, next);
if (status != BTRFS_TREE_BLOCK_CLEAN) {
free_extent_buffer(next);
err = -EIO;
goto out;
}
*level = *level - 1;
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = next;
path->slots[*level] = 0;
}
out:
path->slots[*level] = btrfs_header_nritems(path->nodes[*level]);
return err;
}
static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path,
struct walk_control *wc, int *level)
{
int i;
struct extent_buffer *leaf;
for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
leaf = path->nodes[i];
if (path->slots[i] + 1 < btrfs_header_nritems(leaf)) {
path->slots[i]++;
*level = i;
return 0;
} else {
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
BUG_ON(*level > wc->active_node);
if (*level == wc->active_node)
leave_shared_node(root, wc, *level);
*level = i + 1;
}
}
return 1;
}
static int check_root_dir(struct inode_record *rec)
{
struct inode_backref *backref;
int ret = -1;
if (!rec->found_inode_item || rec->errors)
goto out;
if (rec->nlink != 1 || rec->found_link != 0)
goto out;
if (list_empty(&rec->backrefs))
goto out;
backref = list_entry(rec->backrefs.next, struct inode_backref, list);
if (!backref->found_inode_ref)
goto out;
if (backref->index != 0 || backref->namelen != 2 ||
memcmp(backref->name, "..", 2))
goto out;
if (backref->found_dir_index || backref->found_dir_item)
goto out;
ret = 0;
out:
return ret;
}
static int repair_inode_isize(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct inode_record *rec)
{
struct btrfs_inode_item *ei;
struct btrfs_key key;
int ret;
key.objectid = rec->ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = (u64)-1;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0)
goto out;
if (ret) {
if (!path->slots[0]) {
ret = -ENOENT;
goto out;
}
path->slots[0]--;
ret = 0;
}
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.objectid != rec->ino) {
ret = -ENOENT;
goto out;
}
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_inode_item);
btrfs_set_inode_size(path->nodes[0], ei, rec->found_size);
btrfs_mark_buffer_dirty(path->nodes[0]);
rec->errors &= ~I_ERR_DIR_ISIZE_WRONG;
printf("reset isize for dir %Lu root %Lu\n", rec->ino,
root->root_key.objectid);
out:
btrfs_release_path(path);
return ret;
}
static int repair_inode_orphan_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
int ret;
ret = btrfs_add_orphan_item(trans, root, path, rec->ino);
btrfs_release_path(path);
if (!ret)
rec->errors &= ~I_ERR_NO_ORPHAN_ITEM;
return ret;
}
static int add_missing_dir_index(struct btrfs_root *root,
struct cache_tree *inode_cache,
struct inode_record *rec,
struct inode_backref *backref)
{
struct btrfs_path *path;
struct btrfs_trans_handle *trans;
struct btrfs_dir_item *dir_item;
struct extent_buffer *leaf;
struct btrfs_key key;
struct btrfs_disk_key disk_key;
struct inode_record *dir_rec;
unsigned long name_ptr;
u32 data_size = sizeof(*dir_item) + backref->namelen;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
return PTR_ERR(trans);
}
fprintf(stderr, "repairing missing dir index item for inode %llu\n",
(unsigned long long)rec->ino);
key.objectid = backref->dir;
key.type = BTRFS_DIR_INDEX_KEY;
key.offset = backref->index;
ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
BUG_ON(ret);
leaf = path->nodes[0];
dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
disk_key.objectid = cpu_to_le64(rec->ino);
disk_key.type = BTRFS_INODE_ITEM_KEY;
disk_key.offset = 0;
btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
btrfs_set_dir_type(leaf, dir_item, imode_to_type(rec->imode));
btrfs_set_dir_data_len(leaf, dir_item, 0);
btrfs_set_dir_name_len(leaf, dir_item, backref->namelen);
name_ptr = (unsigned long)(dir_item + 1);
write_extent_buffer(leaf, backref->name, name_ptr, backref->namelen);
btrfs_mark_buffer_dirty(leaf);
btrfs_free_path(path);
btrfs_commit_transaction(trans, root);
backref->found_dir_index = 1;
dir_rec = get_inode_rec(inode_cache, backref->dir, 0);
if (!dir_rec)
return 0;
dir_rec->found_size += backref->namelen;
if (dir_rec->found_size == dir_rec->isize &&
(dir_rec->errors & I_ERR_DIR_ISIZE_WRONG))
dir_rec->errors &= ~I_ERR_DIR_ISIZE_WRONG;
if (dir_rec->found_size != dir_rec->isize)
dir_rec->errors |= I_ERR_DIR_ISIZE_WRONG;
return 0;
}
static int delete_dir_index(struct btrfs_root *root,
struct cache_tree *inode_cache,
struct inode_record *rec,
struct inode_backref *backref)
{
struct btrfs_trans_handle *trans;
struct btrfs_dir_item *di;
struct btrfs_path *path;
int ret = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
return PTR_ERR(trans);
}
fprintf(stderr, "Deleting bad dir index [%llu,%u,%llu] root %llu\n",
(unsigned long long)backref->dir,
BTRFS_DIR_INDEX_KEY, (unsigned long long)backref->index,
(unsigned long long)root->objectid);
di = btrfs_lookup_dir_index(trans, root, path, backref->dir,
backref->name, backref->namelen,
backref->index, -1);
if (IS_ERR(di)) {
ret = PTR_ERR(di);
btrfs_free_path(path);
btrfs_commit_transaction(trans, root);
if (ret == -ENOENT)
return 0;
return ret;
}
if (!di)
ret = btrfs_del_item(trans, root, path);
else
ret = btrfs_delete_one_dir_name(trans, root, path, di);
BUG_ON(ret);
btrfs_free_path(path);
btrfs_commit_transaction(trans, root);
return ret;
}
static int create_inode_item(struct btrfs_root *root,
struct inode_record *rec,
struct inode_backref *backref, int root_dir)
{
struct btrfs_trans_handle *trans;
struct btrfs_inode_item inode_item;
time_t now = time(NULL);
int ret;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
return ret;
}
fprintf(stderr, "root %llu inode %llu recreating inode item, this may "
"be incomplete, please check permissions and content after "
"the fsck completes.\n", (unsigned long long)root->objectid,
(unsigned long long)rec->ino);
memset(&inode_item, 0, sizeof(inode_item));
btrfs_set_stack_inode_generation(&inode_item, trans->transid);
if (root_dir)
btrfs_set_stack_inode_nlink(&inode_item, 1);
else
btrfs_set_stack_inode_nlink(&inode_item, rec->found_link);
btrfs_set_stack_inode_nbytes(&inode_item, rec->found_size);
if (rec->found_dir_item) {
if (rec->found_file_extent)
fprintf(stderr, "root %llu inode %llu has both a dir "
"item and extents, unsure if it is a dir or a "
"regular file so setting it as a directory\n",
(unsigned long long)root->objectid,
(unsigned long long)rec->ino);
btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
btrfs_set_stack_inode_size(&inode_item, rec->found_size);
} else if (!rec->found_dir_item) {
btrfs_set_stack_inode_size(&inode_item, rec->extent_end);
btrfs_set_stack_inode_mode(&inode_item, S_IFREG | 0755);
}
btrfs_set_stack_timespec_sec(&inode_item.atime, now);
btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
ret = btrfs_insert_inode(trans, root, rec->ino, &inode_item);
BUG_ON(ret);
btrfs_commit_transaction(trans, root);
return 0;
}
static int repair_inode_backrefs(struct btrfs_root *root,
struct inode_record *rec,
struct cache_tree *inode_cache,
int delete)
{
struct inode_backref *tmp, *backref;
u64 root_dirid = btrfs_root_dirid(&root->root_item);
int ret = 0;
int repaired = 0;
list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) {
if (!delete && rec->ino == root_dirid) {
if (!rec->found_inode_item) {
ret = create_inode_item(root, rec, backref, 1);
if (ret)
break;
repaired++;
}
}
/* Index 0 for root dir's are special, don't mess with it */
if (rec->ino == root_dirid && backref->index == 0)
continue;
if (delete &&
((backref->found_dir_index && !backref->found_inode_ref) ||
(backref->found_dir_index && backref->found_inode_ref &&
(backref->errors & REF_ERR_INDEX_UNMATCH)))) {
ret = delete_dir_index(root, inode_cache, rec, backref);
if (ret)
break;
repaired++;
list_del(&backref->list);
free(backref);
}
if (!delete && !backref->found_dir_index &&
backref->found_dir_item && backref->found_inode_ref) {
ret = add_missing_dir_index(root, inode_cache, rec,
backref);
if (ret)
break;
repaired++;
if (backref->found_dir_item &&
backref->found_dir_index &&
backref->found_dir_index) {
if (!backref->errors &&
backref->found_inode_ref) {
list_del(&backref->list);
free(backref);
}
}
}
if (!delete && (!backref->found_dir_index &&
!backref->found_dir_item &&
backref->found_inode_ref)) {
struct btrfs_trans_handle *trans;
struct btrfs_key location;
ret = check_dir_conflict(root, backref->name,
backref->namelen,
backref->dir,
backref->index);
if (ret) {
/*
* let nlink fixing routine to handle it,
* which can do it better.
*/
ret = 0;
break;
}
location.objectid = rec->ino;
location.type = BTRFS_INODE_ITEM_KEY;
location.offset = 0;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
break;
}
fprintf(stderr, "adding missing dir index/item pair "
"for inode %llu\n",
(unsigned long long)rec->ino);
ret = btrfs_insert_dir_item(trans, root, backref->name,
backref->namelen,
backref->dir, &location,
imode_to_type(rec->imode),
backref->index);
BUG_ON(ret);
btrfs_commit_transaction(trans, root);
repaired++;
}
if (!delete && (backref->found_inode_ref &&
backref->found_dir_index &&
backref->found_dir_item &&
!(backref->errors & REF_ERR_INDEX_UNMATCH) &&
!rec->found_inode_item)) {
ret = create_inode_item(root, rec, backref, 0);
if (ret)
break;
repaired++;
}
}
return ret ? ret : repaired;
}
/*
* To determine the file type for nlink/inode_item repair
*
* Return 0 if file type is found and BTRFS_FT_* is stored into type.
* Return -ENOENT if file type is not found.
*/
static int find_file_type(struct inode_record *rec, u8 *type)
{
struct inode_backref *backref;
/* For inode item recovered case */
if (rec->found_inode_item) {
*type = imode_to_type(rec->imode);
return 0;
}
list_for_each_entry(backref, &rec->backrefs, list) {
if (backref->found_dir_index || backref->found_dir_item) {
*type = backref->filetype;
return 0;
}
}
return -ENOENT;
}
/*
* To determine the file name for nlink repair
*
* Return 0 if file name is found, set name and namelen.
* Return -ENOENT if file name is not found.
*/
static int find_file_name(struct inode_record *rec,
char *name, int *namelen)
{
struct inode_backref *backref;
list_for_each_entry(backref, &rec->backrefs, list) {
if (backref->found_dir_index || backref->found_dir_item ||
backref->found_inode_ref) {
memcpy(name, backref->name, backref->namelen);
*namelen = backref->namelen;
return 0;
}
}
return -ENOENT;
}
/* Reset the nlink of the inode to the correct one */
static int reset_nlink(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
struct inode_backref *backref;
struct inode_backref *tmp;
struct btrfs_key key;
struct btrfs_inode_item *inode_item;
int ret = 0;
/* We don't believe this either, reset it and iterate backref */
rec->found_link = 0;
/* Remove all backref including the valid ones */
list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) {
ret = btrfs_unlink(trans, root, rec->ino, backref->dir,
backref->index, backref->name,
backref->namelen, 0);
if (ret < 0)
goto out;
/* remove invalid backref, so it won't be added back */
if (!(backref->found_dir_index &&
backref->found_dir_item &&
backref->found_inode_ref)) {
list_del(&backref->list);
free(backref);
} else {
rec->found_link++;
}
}
/* Set nlink to 0 */
key.objectid = rec->ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_inode_item);
btrfs_set_inode_nlink(path->nodes[0], inode_item, 0);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(path);
/*
* Add back valid inode_ref/dir_item/dir_index,
* add_link() will handle the nlink inc, so new nlink must be correct
*/
list_for_each_entry(backref, &rec->backrefs, list) {
ret = btrfs_add_link(trans, root, rec->ino, backref->dir,
backref->name, backref->namelen,
backref->ref_type, &backref->index, 1);
if (ret < 0)
goto out;
}
out:
btrfs_release_path(path);
return ret;
}
static int repair_inode_nlinks(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
char *dir_name = "lost+found";
char namebuf[BTRFS_NAME_LEN] = {0};
u64 lost_found_ino;
u32 mode = 0700;
u8 type = 0;
int namelen = 0;
int name_recovered = 0;
int type_recovered = 0;
int ret = 0;
/*
* Get file name and type first before these invalid inode ref
* are deleted by remove_all_invalid_backref()
*/
name_recovered = !find_file_name(rec, namebuf, &namelen);
type_recovered = !find_file_type(rec, &type);
if (!name_recovered) {
printf("Can't get file name for inode %llu, using '%llu' as fallback\n",
rec->ino, rec->ino);
namelen = count_digits(rec->ino);
sprintf(namebuf, "%llu", rec->ino);
name_recovered = 1;
}
if (!type_recovered) {
printf("Can't get file type for inode %llu, using FILE as fallback\n",
rec->ino);
type = BTRFS_FT_REG_FILE;
type_recovered = 1;
}
ret = reset_nlink(trans, root, path, rec);
if (ret < 0) {
fprintf(stderr,
"Failed to reset nlink for inode %llu: %s\n",
rec->ino, strerror(-ret));
goto out;
}
if (rec->found_link == 0) {
lost_found_ino = root->highest_inode;
if (lost_found_ino >= BTRFS_LAST_FREE_OBJECTID) {
ret = -EOVERFLOW;
goto out;
}
lost_found_ino++;
ret = btrfs_mkdir(trans, root, dir_name, strlen(dir_name),
BTRFS_FIRST_FREE_OBJECTID, &lost_found_ino,
mode);
if (ret < 0) {
fprintf(stderr, "Failed to create '%s' dir: %s",
dir_name, strerror(-ret));
goto out;
}
ret = btrfs_add_link(trans, root, rec->ino, lost_found_ino,
namebuf, namelen, type, NULL, 1);
/*
* Add ".INO" suffix several times to handle case where
* "FILENAME.INO" is already taken by another file.
*/
while (ret == -EEXIST) {
/*
* Conflicting file name, add ".INO" as suffix * +1 for '.'
*/
if (namelen + count_digits(rec->ino) + 1 >
BTRFS_NAME_LEN) {
ret = -EFBIG;
goto out;
}
snprintf(namebuf + namelen, BTRFS_NAME_LEN - namelen,
".%llu", rec->ino);
namelen += count_digits(rec->ino) + 1;
ret = btrfs_add_link(trans, root, rec->ino,
lost_found_ino, namebuf,
namelen, type, NULL, 1);
}
if (ret < 0) {
fprintf(stderr,
"Failed to link the inode %llu to %s dir: %s",
rec->ino, dir_name, strerror(-ret));
goto out;
}
/*
* Just increase the found_link, don't actually add the
* backref. This will make things easier and this inode
* record will be freed after the repair is done.
* So fsck will not report problem about this inode.
*/
rec->found_link++;
printf("Moving file '%.*s' to '%s' dir since it has no valid backref\n",
namelen, namebuf, dir_name);
}
printf("Fixed the nlink of inode %llu\n", rec->ino);
out:
/*
* Clear the flag anyway, or we will loop forever for the same inode
* as it will not be removed from the bad inode list and the dead loop
* happens.
*/
rec->errors &= ~I_ERR_LINK_COUNT_WRONG;
btrfs_release_path(path);
return ret;
}
/*
* Check if there is any normal(reg or prealloc) file extent for given
* ino.
* This is used to determine the file type when neither its dir_index/item or
* inode_item exists.
*
* This will *NOT* report error, if any error happens, just consider it does
* not have any normal file extent.
*/
static int find_normal_file_extent(struct btrfs_root *root, u64 ino)
{
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_file_extent_item *fi;
u8 type;
int ret = 0;
path = btrfs_alloc_path();
if (!path)
goto out;
key.objectid = ino;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
ret = 0;
goto out;
}
if (ret && path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret) {
ret = 0;
goto out;
}
}
while (1) {
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
if (found_key.objectid != ino ||
found_key.type != BTRFS_EXTENT_DATA_KEY)
break;
fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_file_extent_item);
type = btrfs_file_extent_type(path->nodes[0], fi);
if (type != BTRFS_FILE_EXTENT_INLINE) {
ret = 1;
goto out;
}
}
out:
btrfs_free_path(path);
return ret;
}
static u32 btrfs_type_to_imode(u8 type)
{
static u32 imode_by_btrfs_type[] = {
[BTRFS_FT_REG_FILE] = S_IFREG,
[BTRFS_FT_DIR] = S_IFDIR,
[BTRFS_FT_CHRDEV] = S_IFCHR,
[BTRFS_FT_BLKDEV] = S_IFBLK,
[BTRFS_FT_FIFO] = S_IFIFO,
[BTRFS_FT_SOCK] = S_IFSOCK,
[BTRFS_FT_SYMLINK] = S_IFLNK,
};
return imode_by_btrfs_type[(type)];
}
static int repair_inode_no_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
u8 filetype;
u32 mode = 0700;
int type_recovered = 0;
int ret = 0;
printf("Trying to rebuild inode:%llu\n", rec->ino);
type_recovered = !find_file_type(rec, &filetype);
/*
* Try to determine inode type if type not found.
*
* For found regular file extent, it must be FILE.
* For found dir_item/index, it must be DIR.
*
* For undetermined one, use FILE as fallback.
*
* TODO:
* 1. If found backref(inode_index/item is already handled) to it,
* it must be DIR.
* Need new inode-inode ref structure to allow search for that.
*/
if (!type_recovered) {
if (rec->found_file_extent &&
find_normal_file_extent(root, rec->ino)) {
type_recovered = 1;
filetype = BTRFS_FT_REG_FILE;
} else if (rec->found_dir_item) {
type_recovered = 1;
filetype = BTRFS_FT_DIR;
} else if (!list_empty(&rec->orphan_extents)) {
type_recovered = 1;
filetype = BTRFS_FT_REG_FILE;
} else{
printf("Can't determint the filetype for inode %llu, assume it is a normal file\n",
rec->ino);
type_recovered = 1;
filetype = BTRFS_FT_REG_FILE;
}
}
ret = btrfs_new_inode(trans, root, rec->ino,
mode | btrfs_type_to_imode(filetype));
if (ret < 0)
goto out;
/*
* Here inode rebuild is done, we only rebuild the inode item,
* don't repair the nlink(like move to lost+found).
* That is the job of nlink repair.
*
* We just fill the record and return
*/
rec->found_dir_item = 1;
rec->imode = mode | btrfs_type_to_imode(filetype);
rec->nlink = 0;
rec->errors &= ~I_ERR_NO_INODE_ITEM;
/* Ensure the inode_nlinks repair function will be called */
rec->errors |= I_ERR_LINK_COUNT_WRONG;
out:
return ret;
}
static int repair_inode_orphan_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
struct orphan_data_extent *orphan;
struct orphan_data_extent *tmp;
int ret = 0;
list_for_each_entry_safe(orphan, tmp, &rec->orphan_extents, list) {
/*
* Check for conflicting file extents
*
* Here we don't know whether the extents is compressed or not,
* so we can only assume it not compressed nor data offset,
* and use its disk_len as extent length.
*/
ret = btrfs_get_extent(NULL, root, path, orphan->objectid,
orphan->offset, orphan->disk_len, 0);
btrfs_release_path(path);
if (ret < 0)
goto out;
if (!ret) {
fprintf(stderr,
"orphan extent (%llu, %llu) conflicts, delete the orphan\n",
orphan->disk_bytenr, orphan->disk_len);
ret = btrfs_free_extent(trans,
root->fs_info->extent_root,
orphan->disk_bytenr, orphan->disk_len,
0, root->objectid, orphan->objectid,
orphan->offset);
if (ret < 0)
goto out;
}
ret = btrfs_insert_file_extent(trans, root, orphan->objectid,
orphan->offset, orphan->disk_bytenr,
orphan->disk_len, orphan->disk_len);
if (ret < 0)
goto out;
/* Update file size info */
rec->found_size += orphan->disk_len;
if (rec->found_size == rec->nbytes)
rec->errors &= ~I_ERR_FILE_NBYTES_WRONG;
/* Update the file extent hole info too */
ret = del_file_extent_hole(&rec->holes, orphan->offset,
orphan->disk_len);
if (ret < 0)
goto out;
if (RB_EMPTY_ROOT(&rec->holes))
rec->errors &= ~I_ERR_FILE_EXTENT_DISCOUNT;
list_del(&orphan->list);
free(orphan);
}
rec->errors &= ~I_ERR_FILE_EXTENT_ORPHAN;
out:
return ret;
}
static int repair_inode_discount_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
struct rb_node *node;
struct file_extent_hole *hole;
int ret = 0;
node = rb_first(&rec->holes);
while (node) {
hole = rb_entry(node, struct file_extent_hole, node);
ret = btrfs_punch_hole(trans, root, rec->ino,
hole->start, hole->len);
if (ret < 0)
goto out;
ret = del_file_extent_hole(&rec->holes, hole->start,
hole->len);
if (ret < 0)
goto out;
if (RB_EMPTY_ROOT(&rec->holes))
rec->errors &= ~I_ERR_FILE_EXTENT_DISCOUNT;
node = rb_first(&rec->holes);
}
printf("Fixed discount file extents for inode: %llu in root: %llu\n",
rec->ino, root->objectid);
out:
return ret;
}
static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
{
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
int ret = 0;
if (!(rec->errors & (I_ERR_DIR_ISIZE_WRONG |
I_ERR_NO_ORPHAN_ITEM |
I_ERR_LINK_COUNT_WRONG |
I_ERR_NO_INODE_ITEM |
I_ERR_FILE_EXTENT_ORPHAN |
I_ERR_FILE_EXTENT_DISCOUNT)))
return rec->errors;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/*
* For nlink repair, it may create a dir and add link, so
* 2 for parent(256)'s dir_index and dir_item
* 2 for lost+found dir's inode_item and inode_ref
* 1 for the new inode_ref of the file
* 2 for lost+found dir's dir_index and dir_item for the file
*/
trans = btrfs_start_transaction(root, 7);
if (IS_ERR(trans)) {
btrfs_free_path(path);
return PTR_ERR(trans);
}
if (rec->errors & I_ERR_NO_INODE_ITEM)
ret = repair_inode_no_item(trans, root, path, rec);
if (!ret && rec->errors & I_ERR_FILE_EXTENT_ORPHAN)
ret = repair_inode_orphan_extent(trans, root, path, rec);
if (!ret && rec->errors & I_ERR_FILE_EXTENT_DISCOUNT)
ret = repair_inode_discount_extent(trans, root, path, rec);
if (!ret && rec->errors & I_ERR_DIR_ISIZE_WRONG)
ret = repair_inode_isize(trans, root, path, rec);
if (!ret && rec->errors & I_ERR_NO_ORPHAN_ITEM)
ret = repair_inode_orphan_item(trans, root, path, rec);
if (!ret && rec->errors & I_ERR_LINK_COUNT_WRONG)
ret = repair_inode_nlinks(trans, root, path, rec);
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int check_inode_recs(struct btrfs_root *root,
struct cache_tree *inode_cache)
{
struct cache_extent *cache;
struct ptr_node *node;
struct inode_record *rec;
struct inode_backref *backref;
int stage = 0;
int ret = 0;
int err = 0;
u64 error = 0;
u64 root_dirid = btrfs_root_dirid(&root->root_item);
if (btrfs_root_refs(&root->root_item) == 0) {
if (!cache_tree_empty(inode_cache))
fprintf(stderr, "warning line %d\n", __LINE__);
return 0;
}
/*
* We need to record the highest inode number for later 'lost+found'
* dir creation.
* We must select a ino not used/refered by any existing inode, or
* 'lost+found' ino may be a missing ino in a corrupted leaf,
* this may cause 'lost+found' dir has wrong nlinks.
*/
cache = last_cache_extent(inode_cache);
if (cache) {
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
if (rec->ino > root->highest_inode)
root->highest_inode = rec->ino;
}
/*
* We need to repair backrefs first because we could change some of the
* errors in the inode recs.
*
* We also need to go through and delete invalid backrefs first and then
* add the correct ones second. We do this because we may get EEXIST
* when adding back the correct index because we hadn't yet deleted the
* invalid index.
*
* For example, if we were missing a dir index then the directories
* isize would be wrong, so if we fixed the isize to what we thought it
* would be and then fixed the backref we'd still have a invalid fs, so
* we need to add back the dir index and then check to see if the isize
* is still wrong.
*/
while (stage < 3) {
stage++;
if (stage == 3 && !err)
break;
cache = search_cache_extent(inode_cache, 0);
while (repair && cache) {
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
cache = next_cache_extent(cache);
/* Need to free everything up and rescan */
if (stage == 3) {
remove_cache_extent(inode_cache, &node->cache);
free(node);
free_inode_rec(rec);
continue;
}
if (list_empty(&rec->backrefs))
continue;
ret = repair_inode_backrefs(root, rec, inode_cache,
stage == 1);
if (ret < 0) {
err = ret;
stage = 2;
break;
} if (ret > 0) {
err = -EAGAIN;
}
}
}
if (err)
return err;
rec = get_inode_rec(inode_cache, root_dirid, 0);
if (rec) {
ret = check_root_dir(rec);
if (ret) {
fprintf(stderr, "root %llu root dir %llu error\n",
(unsigned long long)root->root_key.objectid,
(unsigned long long)root_dirid);
print_inode_error(root, rec);
error++;
}
} else {
if (repair) {
struct btrfs_trans_handle *trans;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
return err;
}
fprintf(stderr,
"root %llu missing its root dir, recreating\n",
(unsigned long long)root->objectid);
ret = btrfs_make_root_dir(trans, root, root_dirid);
BUG_ON(ret);
btrfs_commit_transaction(trans, root);
return -EAGAIN;
}
fprintf(stderr, "root %llu root dir %llu not found\n",
(unsigned long long)root->root_key.objectid,
(unsigned long long)root_dirid);
}
while (1) {
cache = search_cache_extent(inode_cache, 0);
if (!cache)
break;
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
remove_cache_extent(inode_cache, &node->cache);
free(node);
if (rec->ino == root_dirid ||
rec->ino == BTRFS_ORPHAN_OBJECTID) {
free_inode_rec(rec);
continue;
}
if (rec->errors & I_ERR_NO_ORPHAN_ITEM) {
ret = check_orphan_item(root, rec->ino);
if (ret == 0)
rec->errors &= ~I_ERR_NO_ORPHAN_ITEM;
if (can_free_inode_rec(rec)) {
free_inode_rec(rec);
continue;
}
}
if (!rec->found_inode_item)
rec->errors |= I_ERR_NO_INODE_ITEM;
if (rec->found_link != rec->nlink)
rec->errors |= I_ERR_LINK_COUNT_WRONG;
if (repair) {
ret = try_repair_inode(root, rec);
if (ret == 0 && can_free_inode_rec(rec)) {
free_inode_rec(rec);
continue;
}
ret = 0;
}
if (!(repair && ret == 0))
error++;
print_inode_error(root, rec);
list_for_each_entry(backref, &rec->backrefs, list) {
if (!backref->found_dir_item)
backref->errors |= REF_ERR_NO_DIR_ITEM;
if (!backref->found_dir_index)
backref->errors |= REF_ERR_NO_DIR_INDEX;
if (!backref->found_inode_ref)
backref->errors |= REF_ERR_NO_INODE_REF;
fprintf(stderr, "\tunresolved ref dir %llu index %llu"
" namelen %u name %s filetype %d errors %x",
(unsigned long long)backref->dir,
(unsigned long long)backref->index,
backref->namelen, backref->name,
backref->filetype, backref->errors);
print_ref_error(backref->errors);
}
free_inode_rec(rec);
}
return (error > 0) ? -1 : 0;
}
static struct root_record *get_root_rec(struct cache_tree *root_cache,
u64 objectid)
{
struct cache_extent *cache;
struct root_record *rec = NULL;
int ret;
cache = lookup_cache_extent(root_cache, objectid, 1);
if (cache) {
rec = container_of(cache, struct root_record, cache);
} else {
rec = calloc(1, sizeof(*rec));
rec->objectid = objectid;
INIT_LIST_HEAD(&rec->backrefs);
rec->cache.start = objectid;
rec->cache.size = 1;
ret = insert_cache_extent(root_cache, &rec->cache);
BUG_ON(ret);
}
return rec;
}
static struct root_backref *get_root_backref(struct root_record *rec,
u64 ref_root, u64 dir, u64 index,
const char *name, int namelen)
{
struct root_backref *backref;
list_for_each_entry(backref, &rec->backrefs, list) {
if (backref->ref_root != ref_root || backref->dir != dir ||
backref->namelen != namelen)
continue;
if (memcmp(name, backref->name, namelen))
continue;
return backref;
}
backref = malloc(sizeof(*backref) + namelen + 1);
memset(backref, 0, sizeof(*backref));
backref->ref_root = ref_root;
backref->dir = dir;
backref->index = index;
backref->namelen = namelen;
memcpy(backref->name, name, namelen);
backref->name[namelen] = '\0';
list_add_tail(&backref->list, &rec->backrefs);
return backref;
}
static void free_root_record(struct cache_extent *cache)
{
struct root_record *rec;
struct root_backref *backref;
rec = container_of(cache, struct root_record, cache);
while (!list_empty(&rec->backrefs)) {
backref = list_entry(rec->backrefs.next,
struct root_backref, list);
list_del(&backref->list);
free(backref);
}
kfree(rec);
}
FREE_EXTENT_CACHE_BASED_TREE(root_recs, free_root_record);
static int add_root_backref(struct cache_tree *root_cache,
u64 root_id, u64 ref_root, u64 dir, u64 index,
const char *name, int namelen,
int item_type, int errors)
{
struct root_record *rec;
struct root_backref *backref;
rec = get_root_rec(root_cache, root_id);
backref = get_root_backref(rec, ref_root, dir, index, name, namelen);
backref->errors |= errors;
if (item_type != BTRFS_DIR_ITEM_KEY) {
if (backref->found_dir_index || backref->found_back_ref ||
backref->found_forward_ref) {
if (backref->index != index)
backref->errors |= REF_ERR_INDEX_UNMATCH;
} else {
backref->index = index;
}
}
if (item_type == BTRFS_DIR_ITEM_KEY) {
if (backref->found_forward_ref)
rec->found_ref++;
backref->found_dir_item = 1;
} else if (item_type == BTRFS_DIR_INDEX_KEY) {
backref->found_dir_index = 1;
} else if (item_type == BTRFS_ROOT_REF_KEY) {
if (backref->found_forward_ref)
backref->errors |= REF_ERR_DUP_ROOT_REF;
else if (backref->found_dir_item)
rec->found_ref++;
backref->found_forward_ref = 1;
} else if (item_type == BTRFS_ROOT_BACKREF_KEY) {
if (backref->found_back_ref)
backref->errors |= REF_ERR_DUP_ROOT_BACKREF;
backref->found_back_ref = 1;
} else {
BUG_ON(1);
}
if (backref->found_forward_ref && backref->found_dir_item)
backref->reachable = 1;
return 0;
}
static int merge_root_recs(struct btrfs_root *root,
struct cache_tree *src_cache,
struct cache_tree *dst_cache)
{
struct cache_extent *cache;
struct ptr_node *node;
struct inode_record *rec;
struct inode_backref *backref;
int ret = 0;
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
free_inode_recs_tree(src_cache);
return 0;
}
while (1) {
cache = search_cache_extent(src_cache, 0);
if (!cache)
break;
node = container_of(cache, struct ptr_node, cache);
rec = node->data;
remove_cache_extent(src_cache, &node->cache);
free(node);
ret = is_child_root(root, root->objectid, rec->ino);
if (ret < 0)
break;
else if (ret == 0)
goto skip;
list_for_each_entry(backref, &rec->backrefs, list) {
BUG_ON(backref->found_inode_ref);
if (backref->found_dir_item)
add_root_backref(dst_cache, rec->ino,
root->root_key.objectid, backref->dir,
backref->index, backref->name,
backref->namelen, BTRFS_DIR_ITEM_KEY,
backref->errors);
if (backref->found_dir_index)
add_root_backref(dst_cache, rec->ino,
root->root_key.objectid, backref->dir,
backref->index, backref->name,
backref->namelen, BTRFS_DIR_INDEX_KEY,
backref->errors);
}
skip:
free_inode_rec(rec);
}
if (ret < 0)
return ret;
return 0;
}
static int check_root_refs(struct btrfs_root *root,
struct cache_tree *root_cache)
{
struct root_record *rec;
struct root_record *ref_root;
struct root_backref *backref;
struct cache_extent *cache;
int loop = 1;
int ret;
int error;
int errors = 0;
rec = get_root_rec(root_cache, BTRFS_FS_TREE_OBJECTID);
rec->found_ref = 1;
/* fixme: this can not detect circular references */
while (loop) {
loop = 0;
cache = search_cache_extent(root_cache, 0);
while (1) {
if (!cache)
break;
rec = container_of(cache, struct root_record, cache);
cache = next_cache_extent(cache);
if (rec->found_ref == 0)
continue;
list_for_each_entry(backref, &rec->backrefs, list) {
if (!backref->reachable)
continue;
ref_root = get_root_rec(root_cache,
backref->ref_root);
if (ref_root->found_ref > 0)
continue;
backref->reachable = 0;
rec->found_ref--;
if (rec->found_ref == 0)
loop = 1;
}
}
}
cache = search_cache_extent(root_cache, 0);
while (1) {
if (!cache)
break;
rec = container_of(cache, struct root_record, cache);
cache = next_cache_extent(cache);
if (rec->found_ref == 0 &&
rec->objectid >= BTRFS_FIRST_FREE_OBJECTID &&
rec->objectid <= BTRFS_LAST_FREE_OBJECTID) {
ret = check_orphan_item(root->fs_info->tree_root,
rec->objectid);
if (ret == 0)
continue;
/*
* If we don't have a root item then we likely just have
* a dir item in a snapshot for this root but no actual
* ref key or anything so it's meaningless.
*/
if (!rec->found_root_item)
continue;
errors++;
fprintf(stderr, "fs tree %llu not referenced\n",
(unsigned long long)rec->objectid);
}
error = 0;
if (rec->found_ref > 0 && !rec->found_root_item)
error = 1;
list_for_each_entry(backref, &rec->backrefs, list) {
if (!backref->found_dir_item)
backref->errors |= REF_ERR_NO_DIR_ITEM;
if (!backref->found_dir_index)
backref->errors |= REF_ERR_NO_DIR_INDEX;
if (!backref->found_back_ref)
backref->errors |= REF_ERR_NO_ROOT_BACKREF;
if (!backref->found_forward_ref)
backref->errors |= REF_ERR_NO_ROOT_REF;
if (backref->reachable && backref->errors)
error = 1;
}
if (!error)
continue;
errors++;
fprintf(stderr, "fs tree %llu refs %u %s\n",
(unsigned long long)rec->objectid, rec->found_ref,
rec->found_root_item ? "" : "not found");
list_for_each_entry(backref, &rec->backrefs, list) {
if (!backref->reachable)
continue;
if (!backref->errors && rec->found_root_item)
continue;
fprintf(stderr, "\tunresolved ref root %llu dir %llu"
" index %llu namelen %u name %s errors %x\n",
(unsigned long long)backref->ref_root,
(unsigned long long)backref->dir,
(unsigned long long)backref->index,
backref->namelen, backref->name,
backref->errors);
print_ref_error(backref->errors);
}
}
return errors > 0 ? 1 : 0;
}
static int process_root_ref(struct extent_buffer *eb, int slot,
struct btrfs_key *key,
struct cache_tree *root_cache)
{
u64 dirid;
u64 index;
u32 len;
u32 name_len;
struct btrfs_root_ref *ref;
char namebuf[BTRFS_NAME_LEN];
int error;
ref = btrfs_item_ptr(eb, slot, struct btrfs_root_ref);
dirid = btrfs_root_ref_dirid(eb, ref);
index = btrfs_root_ref_sequence(eb, ref);
name_len = btrfs_root_ref_name_len(eb, ref);
if (name_len <= BTRFS_NAME_LEN) {
len = name_len;
error = 0;
} else {
len = BTRFS_NAME_LEN;
error = REF_ERR_NAME_TOO_LONG;
}
read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len);
if (key->type == BTRFS_ROOT_REF_KEY) {
add_root_backref(root_cache, key->offset, key->objectid, dirid,
index, namebuf, len, key->type, error);
} else {
add_root_backref(root_cache, key->objectid, key->offset, dirid,
index, namebuf, len, key->type, error);
}
return 0;
}
static void free_corrupt_block(struct cache_extent *cache)
{
struct btrfs_corrupt_block *corrupt;
corrupt = container_of(cache, struct btrfs_corrupt_block, cache);
free(corrupt);
}
FREE_EXTENT_CACHE_BASED_TREE(corrupt_blocks, free_corrupt_block);
/*
* Repair the btree of the given root.
*
* The fix is to remove the node key in corrupt_blocks cache_tree.
* and rebalance the tree.
* After the fix, the btree should be writeable.
*/
static int repair_btree(struct btrfs_root *root,
struct cache_tree *corrupt_blocks)
{
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
struct btrfs_corrupt_block *corrupt;
struct cache_extent *cache;
struct btrfs_key key;
u64 offset;
int level;
int ret = 0;
if (cache_tree_empty(corrupt_blocks))
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
fprintf(stderr, "Error starting transaction: %s\n",
strerror(-ret));
goto out_free_path;
}
cache = first_cache_extent(corrupt_blocks);
while (cache) {
corrupt = container_of(cache, struct btrfs_corrupt_block,
cache);
level = corrupt->level;
path->lowest_level = level;
key.objectid = corrupt->key.objectid;
key.type = corrupt->key.type;
key.offset = corrupt->key.offset;
/*
* Here we don't want to do any tree balance, since it may
* cause a balance with corrupted brother leaf/node,
* so ins_len set to 0 here.
* Balance will be done after all corrupt node/leaf is deleted.
*/
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0)
goto out;
offset = btrfs_node_blockptr(path->nodes[level],
path->slots[level]);
/* Remove the ptr */
ret = btrfs_del_ptr(trans, root, path, level,
path->slots[level]);
if (ret < 0)
goto out;
/*
* Remove the corresponding extent
* return value is not concerned.
*/
btrfs_release_path(path);
ret = btrfs_free_extent(trans, root, offset, root->nodesize,
0, root->root_key.objectid,
level - 1, 0);
cache = next_cache_extent(cache);
}
/* Balance the btree using btrfs_search_slot() */
cache = first_cache_extent(corrupt_blocks);
while (cache) {
corrupt = container_of(cache, struct btrfs_corrupt_block,
cache);
memcpy(&key, &corrupt->key, sizeof(key));
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;
/* return will always >0 since it won't find the item */
ret = 0;
btrfs_release_path(path);
cache = next_cache_extent(cache);
}
out:
btrfs_commit_transaction(trans, root);
out_free_path:
btrfs_free_path(path);
return ret;
}
static int check_fs_root(struct btrfs_root *root,
struct cache_tree *root_cache,
struct walk_control *wc)
{
int ret = 0;
int err = 0;
int wret;
int level;
struct btrfs_path path;
struct shared_node root_node;
struct root_record *rec;
struct btrfs_root_item *root_item = &root->root_item;
struct cache_tree corrupt_blocks;
struct orphan_data_extent *orphan;
struct orphan_data_extent *tmp;
enum btrfs_tree_block_status status;
/*
* Reuse the corrupt_block cache tree to record corrupted tree block
*
* Unlike the usage in extent tree check, here we do it in a per
* fs/subvol tree base.
*/
cache_tree_init(&corrupt_blocks);
root->fs_info->corrupt_blocks = &corrupt_blocks;
if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
rec = get_root_rec(root_cache, root->root_key.objectid);
if (btrfs_root_refs(root_item) > 0)
rec->found_root_item = 1;
}
btrfs_init_path(&path);
memset(&root_node, 0, sizeof(root_node));
cache_tree_init(&root_node.root_cache);
cache_tree_init(&root_node.inode_cache);
/* Move the orphan extent record to corresponding inode_record */
list_for_each_entry_safe(orphan, tmp,
&root->orphan_data_extents, list) {
struct inode_record *inode;
inode = get_inode_rec(&root_node.inode_cache, orphan->objectid,
1);
inode->errors |= I_ERR_FILE_EXTENT_ORPHAN;
list_move(&orphan->list, &inode->orphan_extents);
}
level = btrfs_header_level(root->node);
memset(wc->nodes, 0, sizeof(wc->nodes));
wc->nodes[level] = &root_node;
wc->active_node = level;
wc->root_level = level;
/* We may not have checked the root block, lets do that now */
if (btrfs_is_leaf(root->node))
status = btrfs_check_leaf(root, NULL, root->node);
else
status = btrfs_check_node(root, NULL, root->node);
if (status != BTRFS_TREE_BLOCK_CLEAN)
return -EIO;
if (btrfs_root_refs(root_item) > 0 ||
btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
path.nodes[level] = root->node;
extent_buffer_get(root->node);
path.slots[level] = 0;
} else {
struct btrfs_key key;
struct btrfs_disk_key found_key;
btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
level = root_item->drop_level;
path.lowest_level = level;
wret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (wret < 0)
goto skip_walking;
btrfs_node_key(path.nodes[level], &found_key,
path.slots[level]);
WARN_ON(memcmp(&found_key, &root_item->drop_progress,
sizeof(found_key)));
}
while (1) {
wret = walk_down_tree(root, &path, wc, &level);
if (wret < 0)
ret = wret;
if (wret != 0)
break;
wret = walk_up_tree(root, &path, wc, &level);
if (wret < 0)
ret = wret;
if (wret != 0)
break;
}
skip_walking:
btrfs_release_path(&path);
if (!cache_tree_empty(&corrupt_blocks)) {
struct cache_extent *cache;
struct btrfs_corrupt_block *corrupt;
printf("The following tree block(s) is corrupted in tree %llu:\n",
root->root_key.objectid);
cache = first_cache_extent(&corrupt_blocks);
while (cache) {
corrupt = container_of(cache,
struct btrfs_corrupt_block,
cache);
printf("\ttree block bytenr: %llu, level: %d, node key: (%llu, %u, %llu)\n",
cache->start, corrupt->level,
corrupt->key.objectid, corrupt->key.type,
corrupt->key.offset);
cache = next_cache_extent(cache);
}
if (repair) {
printf("Try to repair the btree for root %llu\n",
root->root_key.objectid);
ret = repair_btree(root, &corrupt_blocks);
if (ret < 0)
fprintf(stderr, "Failed to repair btree: %s\n",
strerror(-ret));
if (!ret)
printf("Btree for root %llu is fixed\n",
root->root_key.objectid);
}
}
err = merge_root_recs(root, &root_node.root_cache, root_cache);
if (err < 0)
ret = err;
if (root_node.current) {
root_node.current->checked = 1;
maybe_free_inode_rec(&root_node.inode_cache,
root_node.current);
}
err = check_inode_recs(root, &root_node.inode_cache);
if (!ret)
ret = err;
free_corrupt_blocks_tree(&corrupt_blocks);
root->fs_info->corrupt_blocks = NULL;
free_orphan_data_extents(&root->orphan_data_extents);
return ret;
}
static int fs_root_objectid(u64 objectid)
{
if (objectid == BTRFS_TREE_RELOC_OBJECTID ||
objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
return 1;
return is_fstree(objectid);
}
static int check_fs_roots(struct btrfs_root *root,
struct cache_tree *root_cache)
{
struct btrfs_path path;
struct btrfs_key key;
struct walk_control wc;
struct extent_buffer *leaf, *tree_node;
struct btrfs_root *tmp_root;
struct btrfs_root *tree_root = root->fs_info->tree_root;
int ret;
int err = 0;
/*
* Just in case we made any changes to the extent tree that weren't
* reflected into the free space cache yet.
*/
if (repair)
reset_cached_block_groups(root->fs_info);
memset(&wc, 0, sizeof(wc));
cache_tree_init(&wc.shared);
btrfs_init_path(&path);
again:
key.offset = 0;
key.objectid = 0;
key.type = BTRFS_ROOT_ITEM_KEY;
ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0);
if (ret < 0) {
err = 1;
goto out;
}
tree_node = tree_root->node;
while (1) {
if (tree_node != tree_root->node) {
free_root_recs_tree(root_cache);
btrfs_release_path(&path);
goto again;
}
leaf = path.nodes[0];
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(tree_root, &path);
if (ret) {
if (ret < 0)
err = 1;
break;
}
leaf = path.nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
if (key.type == BTRFS_ROOT_ITEM_KEY &&
fs_root_objectid(key.objectid)) {
if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
tmp_root = btrfs_read_fs_root_no_cache(
root->fs_info, &key);
} else {
key.offset = (u64)-1;
tmp_root = btrfs_read_fs_root(
root->fs_info, &key);
}
if (IS_ERR(tmp_root)) {
err = 1;
goto next;
}
ret = check_fs_root(tmp_root, root_cache, &wc);
if (ret == -EAGAIN) {
free_root_recs_tree(root_cache);
btrfs_release_path(&path);
goto again;
}
if (ret)
err = 1;
if (key.objectid == BTRFS_TREE_RELOC_OBJECTID)
btrfs_free_fs_root(tmp_root);
} else if (key.type == BTRFS_ROOT_REF_KEY ||
key.type == BTRFS_ROOT_BACKREF_KEY) {
process_root_ref(leaf, path.slots[0], &key,
root_cache);
}
next:
path.slots[0]++;
}
out:
btrfs_release_path(&path);
if (err)
free_extent_cache_tree(&wc.shared);
if (!cache_tree_empty(&wc.shared))
fprintf(stderr, "warning line %d\n", __LINE__);
return err;
}
static int all_backpointers_checked(struct extent_record *rec, int print_errs)
{
struct list_head *cur = rec->backrefs.next;
struct extent_backref *back;
struct tree_backref *tback;
struct data_backref *dback;
u64 found = 0;
int err = 0;
while(cur != &rec->backrefs) {
back = list_entry(cur, struct extent_backref, list);
cur = cur->next;
if (!back->found_extent_tree) {
err = 1;
if (!print_errs)
goto out;
if (back->is_data) {
dback = (struct data_backref *)back;
fprintf(stderr, "Backref %llu %s %llu"
" owner %llu offset %llu num_refs %lu"
" not found in extent tree\n",
(unsigned long long)rec->start,
back->full_backref ?
"parent" : "root",
back->full_backref ?
(unsigned long long)dback->parent:
(unsigned long long)dback->root,
(unsigned long long)dback->owner,
(unsigned long long)dback->offset,
(unsigned long)dback->num_refs);
} else {
tback = (struct tree_backref *)back;
fprintf(stderr, "Backref %llu parent %llu"
" root %llu not found in extent tree\n",
(unsigned long long)rec->start,
(unsigned long long)tback->parent,
(unsigned long long)tback->root);
}
}
if (!back->is_data && !back->found_ref) {
err = 1;
if (!print_errs)
goto out;
tback = (struct tree_backref *)back;
fprintf(stderr, "Backref %llu %s %llu not referenced back %p\n",
(unsigned long long)rec->start,
back->full_backref ? "parent" : "root",
back->full_backref ?
(unsigned long long)tback->parent :
(unsigned long long)tback->root, back);
}
if (back->is_data) {
dback = (struct data_backref *)back;
if (dback->found_ref != dback->num_refs) {
err = 1;
if (!print_errs)
goto out;
fprintf(stderr, "Incorrect local backref count"
" on %llu %s %llu owner %llu"
" offset %llu found %u wanted %u back %p\n",
(unsigned long long)rec->start,
back->full_backref ?
"parent" : "root",
back->full_backref ?
(unsigned long long)dback->parent:
(unsigned long long)dback->root,
(unsigned long long)dback->owner,
(unsigned long long)dback->offset,
dback->found_ref, dback->num_refs, back);
}
if (dback->disk_bytenr != rec->start) {
err = 1;
if (!print_errs)
goto out;
fprintf(stderr, "Backref disk bytenr does not"
" match extent record, bytenr=%llu, "
"ref bytenr=%llu\n",
(unsigned long long)rec->start,
(unsigned long long)dback->disk_bytenr);
}
if (dback->bytes != rec->nr) {
err = 1;
if (!print_errs)
goto out;
fprintf(stderr, "Backref bytes do not match "
"extent backref, bytenr=%llu, ref "
"bytes=%llu, backref bytes=%llu\n",
(unsigned long long)rec->start,
(unsigned long long)rec->nr,
(unsigned long long)dback->bytes);
}
}
if (!back->is_data) {
found += 1;
} else {
dback = (struct data_backref *)back;
found += dback->found_ref;
}
}
if (found != rec->refs) {
err = 1;
if (!print_errs)
goto out;
fprintf(stderr, "Incorrect global backref count "
"on %llu found %llu wanted %llu\n",
(unsigned long long)rec->start,
(unsigned long long)found,
(unsigned long long)rec->refs);
}
out:
return err;
}
static int free_all_extent_backrefs(struct extent_record *rec)
{
struct extent_backref *back;
struct list_head *cur;
while (!list_empty(&rec->backrefs)) {
cur = rec->backrefs.next;
back = list_entry(cur, struct extent_backref, list);
list_del(cur);
free(back);
}
return 0;
}
static void free_extent_record_cache(struct btrfs_fs_info *fs_info,
struct cache_tree *extent_cache)
{
struct cache_extent *cache;
struct extent_record *rec;
while (1) {
cache = first_cache_extent(extent_cache);
if (!cache)
break;
rec = container_of(cache, struct extent_record, cache);
remove_cache_extent(extent_cache, cache);
free_all_extent_backrefs(rec);
free(rec);
}
}
static int maybe_free_extent_rec(struct cache_tree *extent_cache,
struct extent_record *rec)
{
if (rec->content_checked && rec->owner_ref_checked &&
rec->extent_item_refs == rec->refs && rec->refs > 0 &&
rec->num_duplicates == 0 && !all_backpointers_checked(rec, 0) &&
!rec->bad_full_backref) {
remove_cache_extent(extent_cache, &rec->cache);
free_all_extent_backrefs(rec);
list_del_init(&rec->list);
free(rec);
}
return 0;
}
static int check_owner_ref(struct btrfs_root *root,
struct extent_record *rec,
struct extent_buffer *buf)
{
struct extent_backref *node;
struct tree_backref *back;
struct btrfs_root *ref_root;
struct btrfs_key key;
struct btrfs_path path;
struct extent_buffer *parent;
int level;
int found = 0;
int ret;
list_for_each_entry(node, &rec->backrefs, list) {
if (node->is_data)
continue;
if (!node->found_ref)
continue;
if (node->full_backref)
continue;
back = (struct tree_backref *)node;
if (btrfs_header_owner(buf) == back->root)
return 0;
}
BUG_ON(rec->is_root);
/* try to find the block by search corresponding fs tree */
key.objectid = btrfs_header_owner(buf);
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
ref_root = btrfs_read_fs_root(root->fs_info, &key);
if (IS_ERR(ref_root))
return 1;
level = btrfs_header_level(buf);
if (level == 0)
btrfs_item_key_to_cpu(buf, &key, 0);
else
btrfs_node_key_to_cpu(buf, &key, 0);
btrfs_init_path(&path);
path.lowest_level = level + 1;
ret = btrfs_search_slot(NULL, ref_root, &key, &path, 0, 0);
if (ret < 0)
return 0;
parent = path.nodes[level + 1];
if (parent && buf->start == btrfs_node_blockptr(parent,
path.slots[level + 1]))
found = 1;
btrfs_release_path(&path);
return found ? 0 : 1;
}
static int is_extent_tree_record(struct extent_record *rec)
{
struct list_head *cur = rec->backrefs.next;
struct extent_backref *node;
struct tree_backref *back;
int is_extent = 0;
while(cur != &rec->backrefs) {
node = list_entry(cur, struct extent_backref, list);
cur = cur->next;
if (node->is_data)
return 0;
back = (struct tree_backref *)node;
if (node->full_backref)
return 0;
if (back->root == BTRFS_EXTENT_TREE_OBJECTID)
is_extent = 1;
}
return is_extent;
}
static int record_bad_block_io(struct btrfs_fs_info *info,
struct cache_tree *extent_cache,
u64 start, u64 len)
{
struct extent_record *rec;
struct cache_extent *cache;
struct btrfs_key key;
cache = lookup_cache_extent(extent_cache, start, len);
if (!cache)
return 0;
rec = container_of(cache, struct extent_record, cache);
if (!is_extent_tree_record(rec))
return 0;
btrfs_disk_key_to_cpu(&key, &rec->parent_key);
return btrfs_add_corrupt_extent_record(info, &key, start, len, 0);
}
static int swap_values(struct btrfs_root *root, struct btrfs_path *path,
struct extent_buffer *buf, int slot)
{
if (btrfs_header_level(buf)) {
struct btrfs_key_ptr ptr1, ptr2;
read_extent_buffer(buf, &ptr1, btrfs_node_key_ptr_offset(slot),
sizeof(struct btrfs_key_ptr));
read_extent_buffer(buf, &ptr2,
btrfs_node_key_ptr_offset(slot + 1),
sizeof(struct btrfs_key_ptr));
write_extent_buffer(buf, &ptr1,
btrfs_node_key_ptr_offset(slot + 1),
sizeof(struct btrfs_key_ptr));
write_extent_buffer(buf, &ptr2,
btrfs_node_key_ptr_offset(slot),
sizeof(struct btrfs_key_ptr));
if (slot == 0) {
struct btrfs_disk_key key;
btrfs_node_key(buf, &key, 0);
btrfs_fixup_low_keys(root, path, &key,
btrfs_header_level(buf) + 1);
}
} else {
struct btrfs_item *item1, *item2;
struct btrfs_key k1, k2;
char *item1_data, *item2_data;
u32 item1_offset, item2_offset, item1_size, item2_size;
item1 = btrfs_item_nr(slot);
item2 = btrfs_item_nr(slot + 1);
btrfs_item_key_to_cpu(buf, &k1, slot);
btrfs_item_key_to_cpu(buf, &k2, slot + 1);
item1_offset = btrfs_item_offset(buf, item1);
item2_offset = btrfs_item_offset(buf, item2);
item1_size = btrfs_item_size(buf, item1);
item2_size = btrfs_item_size(buf, item2);
item1_data = malloc(item1_size);
if (!item1_data)
return -ENOMEM;
item2_data = malloc(item2_size);
if (!item2_data) {
free(item1_data);
return -ENOMEM;
}
read_extent_buffer(buf, item1_data, item1_offset, item1_size);
read_extent_buffer(buf, item2_data, item2_offset, item2_size);
write_extent_buffer(buf, item1_data, item2_offset, item2_size);
write_extent_buffer(buf, item2_data, item1_offset, item1_size);
free(item1_data);
free(item2_data);
btrfs_set_item_offset(buf, item1, item2_offset);
btrfs_set_item_offset(buf, item2, item1_offset);
btrfs_set_item_size(buf, item1, item2_size);
btrfs_set_item_size(buf, item2, item1_size);
path->slots[0] = slot;
btrfs_set_item_key_unsafe(root, path, &k2);
path->slots[0] = slot + 1;
btrfs_set_item_key_unsafe(root, path, &k1);
}
return 0;
}
static int fix_key_order(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path)
{
struct extent_buffer *buf;
struct btrfs_key k1, k2;
int i;
int level = path->lowest_level;
int ret = -EIO;
buf = path->nodes[level];
for (i = 0; i < btrfs_header_nritems(buf) - 1; i++) {
if (level) {
btrfs_node_key_to_cpu(buf, &k1, i);
btrfs_node_key_to_cpu(buf, &k2, i + 1);
} else {
btrfs_item_key_to_cpu(buf, &k1, i);
btrfs_item_key_to_cpu(buf, &k2, i + 1);
}
if (btrfs_comp_cpu_keys(&k1, &k2) < 0)
continue;
ret = swap_values(root, path, buf, i);
if (ret)
break;
btrfs_mark_buffer_dirty(buf);
i = 0;
}
return ret;
}
static int delete_bogus_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct extent_buffer *buf, int slot)
{
struct btrfs_key key;
int nritems = btrfs_header_nritems(buf);
btrfs_item_key_to_cpu(buf, &key, slot);
/* These are all the keys we can deal with missing. */
if (key.type != BTRFS_DIR_INDEX_KEY &&
key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY &&
key.type != BTRFS_TREE_BLOCK_REF_KEY &&
key.type != BTRFS_EXTENT_DATA_REF_KEY)
return -1;
printf("Deleting bogus item [%llu,%u,%llu] at slot %d on block %llu\n",
(unsigned long long)key.objectid, key.type,
(unsigned long long)key.offset, slot, buf->start);
memmove_extent_buffer(buf, btrfs_item_nr_offset(slot),
btrfs_item_nr_offset(slot + 1),
sizeof(struct btrfs_item) *
(nritems - slot - 1));
btrfs_set_header_nritems(buf, nritems - 1);
if (slot == 0) {
struct btrfs_disk_key disk_key;
btrfs_item_key(buf, &disk_key, 0);
btrfs_fixup_low_keys(root, path, &disk_key, 1);
}
btrfs_mark_buffer_dirty(buf);
return 0;
}
static int fix_item_offset(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path)
{
struct extent_buffer *buf;
int i;
int ret = 0;
/* We should only get this for leaves */
BUG_ON(path->lowest_level);
buf = path->nodes[0];
again:
for (i = 0; i < btrfs_header_nritems(buf); i++) {
unsigned int shift = 0, offset;
if (i == 0 && btrfs_item_end_nr(buf, i) !=
BTRFS_LEAF_DATA_SIZE(root)) {
if (btrfs_item_end_nr(buf, i) >
BTRFS_LEAF_DATA_SIZE(root)) {
ret = delete_bogus_item(trans, root, path,
buf, i);
if (!ret)
goto again;
fprintf(stderr, "item is off the end of the "
"leaf, can't fix\n");
ret = -EIO;
break;
}
shift = BTRFS_LEAF_DATA_SIZE(root) -
btrfs_item_end_nr(buf, i);
} else if (i > 0 && btrfs_item_end_nr(buf, i) !=
btrfs_item_offset_nr(buf, i - 1)) {
if (btrfs_item_end_nr(buf, i) >
btrfs_item_offset_nr(buf, i - 1)) {
ret = delete_bogus_item(trans, root, path,
buf, i);
if (!ret)
goto again;
fprintf(stderr, "items overlap, can't fix\n");
ret = -EIO;
break;
}
shift = btrfs_item_offset_nr(buf, i - 1) -
btrfs_item_end_nr(buf, i);
}
if (!shift)
continue;
printf("Shifting item nr %d by %u bytes in block %llu\n",
i, shift, (unsigned long long)buf->start);
offset = btrfs_item_offset_nr(buf, i);
memmove_extent_buffer(buf,
btrfs_leaf_data(buf) + offset + shift,
btrfs_leaf_data(buf) + offset,
btrfs_item_size_nr(buf, i));
btrfs_set_item_offset(buf, btrfs_item_nr(i),
offset + shift);
btrfs_mark_buffer_dirty(buf);
}
/*
* We may have moved things, in which case we want to exit so we don't
* write those changes out. Once we have proper abort functionality in
* progs this can be changed to something nicer.
*/
BUG_ON(ret);
return ret;
}
/*
* Attempt to fix basic block failures. If we can't fix it for whatever reason
* then just return -EIO.
*/
static int try_to_fix_bad_block(struct btrfs_root *root,
struct extent_buffer *buf,
enum btrfs_tree_block_status status)
{
struct btrfs_trans_handle *trans;
struct ulist *roots;
struct ulist_node *node;
struct btrfs_root *search_root;
struct btrfs_path *path;
struct ulist_iterator iter;
struct btrfs_key root_key, key;
int ret;
if (status != BTRFS_TREE_BLOCK_BAD_KEY_ORDER &&
status != BTRFS_TREE_BLOCK_INVALID_OFFSETS)
return -EIO;
path = btrfs_alloc_path();
if (!path)
return -EIO;
ret = btrfs_find_all_roots(NULL, root->fs_info, buf->start,
0, &roots);
if (ret) {
btrfs_free_path(path);
return -EIO;
}
ULIST_ITER_INIT(&iter);
while ((node = ulist_next(roots, &iter))) {
root_key.objectid = node->val;
root_key.type = BTRFS_ROOT_ITEM_KEY;
root_key.offset = (u64)-1;
search_root = btrfs_read_fs_root(root->fs_info, &root_key);
if (IS_ERR(root)) {
ret = -EIO;
break;
}
trans = btrfs_start_transaction(search_root, 0);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
break;
}
path->lowest_level = btrfs_header_level(buf);
path->skip_check_block = 1;
if (path->lowest_level)
btrfs_node_key_to_cpu(buf, &key, 0);
else
btrfs_item_key_to_cpu(buf, &key, 0);
ret = btrfs_search_slot(trans, search_root, &key, path, 0, 1);
if (ret) {
ret = -EIO;
btrfs_commit_transaction(trans, search_root);
break;
}
if (status == BTRFS_TREE_BLOCK_BAD_KEY_ORDER)
ret = fix_key_order(trans, search_root, path);
else if (status == BTRFS_TREE_BLOCK_INVALID_OFFSETS)
ret = fix_item_offset(trans, search_root, path);
if (ret) {
btrfs_commit_transaction(trans, search_root);
break;
}
btrfs_release_path(path);
btrfs_commit_transaction(trans, search_root);
}
ulist_free(roots);
btrfs_free_path(path);
return ret;
}
static int check_block(struct btrfs_root *root,
struct cache_tree *extent_cache,
struct extent_buffer *buf, u64 flags)
{
struct extent_record *rec;
struct cache_extent *cache;
struct btrfs_key key;
enum btrfs_tree_block_status status;
int ret = 0;
int level;
cache = lookup_cache_extent(extent_cache, buf->start, buf->len);
if (!cache)
return 1;
rec = container_of(cache, struct extent_record, cache);
rec->generation = btrfs_header_generation(buf);
level = btrfs_header_level(buf);
if (btrfs_header_nritems(buf) > 0) {
if (level == 0)
btrfs_item_key_to_cpu(buf, &key, 0);
else
btrfs_node_key_to_cpu(buf, &key, 0);
rec->info_objectid = key.objectid;
}
rec->info_level = level;
if (btrfs_is_leaf(buf))
status = btrfs_check_leaf(root, &rec->parent_key, buf);
else
status = btrfs_check_node(root, &rec->parent_key, buf);
if (status != BTRFS_TREE_BLOCK_CLEAN) {
if (repair)
status = try_to_fix_bad_block(root, buf, status);
if (status != BTRFS_TREE_BLOCK_CLEAN) {
ret = -EIO;
fprintf(stderr, "bad block %llu\n",
(unsigned long long)buf->start);
} else {
/*
* Signal to callers we need to start the scan over
* again since we'll have cow'ed blocks.
*/
ret = -EAGAIN;
}
} else {
rec->content_checked = 1;
if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)
rec->owner_ref_checked = 1;
else {
ret = check_owner_ref(root, rec, buf);
if (!ret)
rec->owner_ref_checked = 1;
}
}
if (!ret)
maybe_free_extent_rec(extent_cache, rec);
return ret;
}
static struct tree_backref *find_tree_backref(struct extent_record *rec,
u64 parent, u64 root)
{
struct list_head *cur = rec->backrefs.next;
struct extent_backref *node;
struct tree_backref *back;
while(cur != &rec->backrefs) {
node = list_entry(cur, struct extent_backref, list);
cur = cur->next;
if (node->is_data)
continue;
back = (struct tree_backref *)node;
if (parent > 0) {
if (!node->full_backref)
continue;
if (parent == back->parent)
return back;
} else {
if (node->full_backref)
continue;
if (back->root == root)
return back;
}
}
return NULL;
}
static struct tree_backref *alloc_tree_backref(struct extent_record *rec,
u64 parent, u64 root)
{
struct tree_backref *ref = malloc(sizeof(*ref));
memset(&ref->node, 0, sizeof(ref->node));
if (parent > 0) {
ref->parent = parent;
ref->node.full_backref = 1;
} else {
ref->root = root;
ref->node.full_backref = 0;
}
list_add_tail(&ref->node.list, &rec->backrefs);
return ref;
}
static struct data_backref *find_data_backref(struct extent_record *rec,
u64 parent, u64 root,
u64 owner, u64 offset,
int found_ref,
u64 disk_bytenr, u64 bytes)
{
struct list_head *cur = rec->backrefs.next;
struct extent_backref *node;
struct data_backref *back;
while(cur != &rec->backrefs) {
node = list_entry(cur, struct extent_backref, list);
cur = cur->next;
if (!node->is_data)
continue;
back = (struct data_backref *)node;
if (parent > 0) {
if (!node->full_backref)
continue;
if (parent == back->parent)
return back;
} else {
if (node->full_backref)
continue;
if (back->root == root && back->owner == owner &&
back->offset == offset) {
if (found_ref && node->found_ref &&
(back->bytes != bytes ||
back->disk_bytenr != disk_bytenr))
continue;
return back;
}
}
}
return NULL;
}
static struct data_backref *alloc_data_backref(struct extent_record *rec,
u64 parent, u64 root,
u64 owner, u64 offset,
u64 max_size)
{
struct data_backref *ref = malloc(sizeof(*ref));
memset(&ref->node, 0, sizeof(ref->node));
ref->node.is_data = 1;
if (parent > 0) {
ref->parent = parent;
ref->owner = 0;
ref->offset = 0;
ref->node.full_backref = 1;
} else {
ref->root = root;
ref->owner = owner;
ref->offset = offset;
ref->node.full_backref = 0;
}
ref->bytes = max_size;
ref->found_ref = 0;
ref->num_refs = 0;
list_add_tail(&ref->node.list, &rec->backrefs);
if (max_size > rec->max_size)
rec->max_size = max_size;
return ref;
}
static int add_extent_rec(struct cache_tree *extent_cache,
struct btrfs_key *parent_key, u64 parent_gen,
u64 start, u64 nr, u64 extent_item_refs,
int is_root, int inc_ref, int set_checked,
int metadata, int extent_rec, u64 max_size)
{
struct extent_record *rec;
struct cache_extent *cache;
int ret = 0;
int dup = 0;
cache = lookup_cache_extent(extent_cache, start, nr);
if (cache) {
rec = container_of(cache, struct extent_record, cache);
if (inc_ref)
rec->refs++;
if (rec->nr == 1)
rec->nr = max(nr, max_size);
/*
* We need to make sure to reset nr to whatever the extent
* record says was the real size, this way we can compare it to
* the backrefs.
*/
if (extent_rec) {
if (start != rec->start || rec->found_rec) {
struct extent_record *tmp;
dup = 1;
if (list_empty(&rec->list))
list_add_tail(&rec->list,
&duplicate_extents);
/*
* We have to do this song and dance in case we
* find an extent record that falls inside of
* our current extent record but does not have
* the same objectid.
*/
tmp = malloc(sizeof(*tmp));
if (!tmp)
return -ENOMEM;
tmp->start = start;
tmp->max_size = max_size;
tmp->nr = nr;
tmp->found_rec = 1;
tmp->metadata = metadata;
tmp->extent_item_refs = extent_item_refs;
INIT_LIST_HEAD(&tmp->list);
list_add_tail(&tmp->list, &rec->dups);
rec->num_duplicates++;
} else {
rec->nr = nr;
rec->found_rec = 1;
}
}
if (extent_item_refs && !dup) {
if (rec->extent_item_refs) {
fprintf(stderr, "block %llu rec "
"extent_item_refs %llu, passed %llu\n",
(unsigned long long)start,
(unsigned long long)
rec->extent_item_refs,
(unsigned long long)extent_item_refs);
}
rec->extent_item_refs = extent_item_refs;
}
if (is_root)
rec->is_root = 1;
if (set_checked) {
rec->content_checked = 1;
rec->owner_ref_checked = 1;
}
if (parent_key)
btrfs_cpu_key_to_disk(&rec->parent_key, parent_key);
if (parent_gen)
rec->parent_generation = parent_gen;
if (rec->max_size < max_size)
rec->max_size = max_size;
maybe_free_extent_rec(extent_cache, rec);
return ret;
}
rec = malloc(sizeof(*rec));
rec->start = start;
rec->max_size = max_size;
rec->nr = max(nr, max_size);
rec->found_rec = !!extent_rec;
rec->content_checked = 0;
rec->owner_ref_checked = 0;
rec->num_duplicates = 0;
rec->metadata = metadata;
rec->flag_block_full_backref = -1;
rec->bad_full_backref = 0;
INIT_LIST_HEAD(&rec->backrefs);
INIT_LIST_HEAD(&rec->dups);
INIT_LIST_HEAD(&rec->list);
if (is_root)
rec->is_root = 1;
else
rec->is_root = 0;
if (inc_ref)
rec->refs = 1;
else
rec->refs = 0;
if (extent_item_refs)
rec->extent_item_refs = extent_item_refs;
else
rec->extent_item_refs = 0;
if (parent_key)
btrfs_cpu_key_to_disk(&rec->parent_key, parent_key);
else
memset(&rec->parent_key, 0, sizeof(*parent_key));
if (parent_gen)
rec->parent_generation = parent_gen;
else
rec->parent_generation = 0;
rec->cache.start = start;
rec->cache.size = nr;
ret = insert_cache_extent(extent_cache, &rec->cache);
BUG_ON(ret);
bytes_used += nr;
if (set_checked) {
rec->content_checked = 1;
rec->owner_ref_checked = 1;
}
return ret;
}
static int add_tree_backref(struct cache_tree *extent_cache, u64 bytenr,
u64 parent, u64 root, int found_ref)
{
struct extent_record *rec;
struct tree_backref *back;
struct cache_extent *cache;
cache = lookup_cache_extent(extent_cache, bytenr, 1);
if (!cache) {
add_extent_rec(extent_cache, NULL, 0, bytenr,
1, 0, 0, 0, 0, 1, 0, 0);
cache = lookup_cache_extent(extent_cache, bytenr, 1);
if (!cache)
abort();
}
rec = container_of(cache, struct extent_record, cache);
if (rec->start != bytenr) {
abort();
}
back = find_tree_backref(rec, parent, root);
if (!back)
back = alloc_tree_backref(rec, parent, root);
if (found_ref) {
if (back->node.found_ref) {
fprintf(stderr, "Extent back ref already exists "
"for %llu parent %llu root %llu \n",
(unsigned long long)bytenr,
(unsigned long long)parent,
(unsigned long long)root);
}
back->node.found_ref = 1;
} else {
if (back->node.found_extent_tree) {
fprintf(stderr, "Extent back ref already exists "
"for %llu parent %llu root %llu \n",
(unsigned long long)bytenr,
(unsigned long long)parent,
(unsigned long long)root);
}
back->node.found_extent_tree = 1;
}
maybe_free_extent_rec(extent_cache, rec);
return 0;
}
static int add_data_backref(struct cache_tree *extent_cache, u64 bytenr,
u64 parent, u64 root, u64 owner, u64 offset,
u32 num_refs, int found_ref, u64 max_size)
{
struct extent_record *rec;
struct data_backref *back;
struct cache_extent *cache;
cache = lookup_cache_extent(extent_cache, bytenr, 1);
if (!cache) {
add_extent_rec(extent_cache, NULL, 0, bytenr, 1, 0, 0, 0, 0,
0, 0, max_size);
cache = lookup_cache_extent(extent_cache, bytenr, 1);
if (!cache)
abort();
}
rec = container_of(cache, struct extent_record, cache);
if (rec->max_size < max_size)
rec->max_size = max_size;
/*
* If found_ref is set then max_size is the real size and must match the
* existing refs. So if we have already found a ref then we need to
* make sure that this ref matches the existing one, otherwise we need
* to add a new backref so we can notice that the backrefs don't match
* and we need to figure out who is telling the truth. This is to
* account for that awful fsync bug I introduced where we'd end up with
* a btrfs_file_extent_item that would have its length include multiple
* prealloc extents or point inside of a prealloc extent.
*/
back = find_data_backref(rec, parent, root, owner, offset, found_ref,
bytenr, max_size);
if (!back)
back = alloc_data_backref(rec, parent, root, owner, offset,
max_size);
if (found_ref) {
BUG_ON(num_refs != 1);
if (back->node.found_ref)
BUG_ON(back->bytes != max_size);
back->node.found_ref = 1;
back->found_ref += 1;
back->bytes = max_size;
back->disk_bytenr = bytenr;
rec->refs += 1;
rec->content_checked = 1;
rec->owner_ref_checked = 1;
} else {
if (back->node.found_extent_tree) {
fprintf(stderr, "Extent back ref already exists "
"for %llu parent %llu root %llu "
"owner %llu offset %llu num_refs %lu\n",
(unsigned long long)bytenr,
(unsigned long long)parent,
(unsigned long long)root,
(unsigned long long)owner,
(unsigned long long)offset,
(unsigned long)num_refs);
}
back->num_refs = num_refs;
back->node.found_extent_tree = 1;
}
maybe_free_extent_rec(extent_cache, rec);
return 0;
}
static int add_pending(struct cache_tree *pending,
struct cache_tree *seen, u64 bytenr, u32 size)
{
int ret;
ret = add_cache_extent(seen, bytenr, size);
if (ret)
return ret;
add_cache_extent(pending, bytenr, size);
return 0;
}
static int pick_next_pending(struct cache_tree *pending,
struct cache_tree *reada,
struct cache_tree *nodes,
u64 last, struct block_info *bits, int bits_nr,
int *reada_bits)
{
unsigned long node_start = last;
struct cache_extent *cache;
int ret;
cache = search_cache_extent(reada, 0);
if (cache) {
bits[0].start = cache->start;
bits[0].size = cache->size;
*reada_bits = 1;
return 1;
}
*reada_bits = 0;
if (node_start > 32768)
node_start -= 32768;
cache = search_cache_extent(nodes, node_start);
if (!cache)
cache = search_cache_extent(nodes, 0);
if (!cache) {
cache = search_cache_extent(pending, 0);
if (!cache)
return 0;
ret = 0;
do {
bits[ret].start = cache->start;
bits[ret].size = cache->size;
cache = next_cache_extent(cache);
ret++;
} while (cache && ret < bits_nr);
return ret;
}
ret = 0;
do {
bits[ret].start = cache->start;
bits[ret].size = cache->size;
cache = next_cache_extent(cache);
ret++;
} while (cache && ret < bits_nr);
if (bits_nr - ret > 8) {
u64 lookup = bits[0].start + bits[0].size;
struct cache_extent *next;
next = search_cache_extent(pending, lookup);
while(next) {
if (next->start - lookup > 32768)
break;
bits[ret].start = next->start;
bits[ret].size = next->size;
lookup = next->start + next->size;
ret++;
if (ret == bits_nr)
break;
next = next_cache_extent(next);
if (!next)
break;
}
}
return ret;
}
static void free_chunk_record(struct cache_extent *cache)
{
struct chunk_record *rec;
rec = container_of(cache, struct chunk_record, cache);
list_del_init(&rec->list);
list_del_init(&rec->dextents);
free(rec);
}
void free_chunk_cache_tree(struct cache_tree *chunk_cache)
{
cache_tree_free_extents(chunk_cache, free_chunk_record);
}
static void free_device_record(struct rb_node *node)
{
struct device_record *rec;
rec = container_of(node, struct device_record, node);
free(rec);
}
FREE_RB_BASED_TREE(device_cache, free_device_record);
int insert_block_group_record(struct block_group_tree *tree,
struct block_group_record *bg_rec)
{
int ret;
ret = insert_cache_extent(&tree->tree, &bg_rec->cache);
if (ret)
return ret;
list_add_tail(&bg_rec->list, &tree->block_groups);
return 0;
}
static void free_block_group_record(struct cache_extent *cache)
{
struct block_group_record *rec;
rec = container_of(cache, struct block_group_record, cache);
list_del_init(&rec->list);
free(rec);
}
void free_block_group_tree(struct block_group_tree *tree)
{
cache_tree_free_extents(&tree->tree, free_block_group_record);
}
int insert_device_extent_record(struct device_extent_tree *tree,
struct device_extent_record *de_rec)
{
int ret;
/*
* Device extent is a bit different from the other extents, because
* the extents which belong to the different devices may have the
* same start and size, so we need use the special extent cache
* search/insert functions.
*/
ret = insert_cache_extent2(&tree->tree, &de_rec->cache);
if (ret)
return ret;
list_add_tail(&de_rec->chunk_list, &tree->no_chunk_orphans);
list_add_tail(&de_rec->device_list, &tree->no_device_orphans);
return 0;
}
static void free_device_extent_record(struct cache_extent *cache)
{
struct device_extent_record *rec;
rec = container_of(cache, struct device_extent_record, cache);
if (!list_empty(&rec->chunk_list))
list_del_init(&rec->chunk_list);
if (!list_empty(&rec->device_list))
list_del_init(&rec->device_list);
free(rec);
}
void free_device_extent_tree(struct device_extent_tree *tree)
{
cache_tree_free_extents(&tree->tree, free_device_extent_record);
}
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
static int process_extent_ref_v0(struct cache_tree *extent_cache,
struct extent_buffer *leaf, int slot)
{
struct btrfs_extent_ref_v0 *ref0;
struct btrfs_key key;
btrfs_item_key_to_cpu(leaf, &key, slot);
ref0 = btrfs_item_ptr(leaf, slot, struct btrfs_extent_ref_v0);
if (btrfs_ref_objectid_v0(leaf, ref0) < BTRFS_FIRST_FREE_OBJECTID) {
add_tree_backref(extent_cache, key.objectid, key.offset, 0, 0);
} else {
add_data_backref(extent_cache, key.objectid, key.offset, 0,
0, 0, btrfs_ref_count_v0(leaf, ref0), 0, 0);
}
return 0;
}
#endif
struct chunk_record *btrfs_new_chunk_record(struct extent_buffer *leaf,
struct btrfs_key *key,
int slot)
{
struct btrfs_chunk *ptr;
struct chunk_record *rec;
int num_stripes, i;
ptr = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
num_stripes = btrfs_chunk_num_stripes(leaf, ptr);
rec = malloc(btrfs_chunk_record_size(num_stripes));
if (!rec) {
fprintf(stderr, "memory allocation failed\n");
exit(-1);
}
memset(rec, 0, btrfs_chunk_record_size(num_stripes));
INIT_LIST_HEAD(&rec->list);
INIT_LIST_HEAD(&rec->dextents);
rec->bg_rec = NULL;
rec->cache.start = key->offset;
rec->cache.size = btrfs_chunk_length(leaf, ptr);
rec->generation = btrfs_header_generation(leaf);
rec->objectid = key->objectid;
rec->type = key->type;
rec->offset = key->offset;
rec->length = rec->cache.size;
rec->owner = btrfs_chunk_owner(leaf, ptr);
rec->stripe_len = btrfs_chunk_stripe_len(leaf, ptr);
rec->type_flags = btrfs_chunk_type(leaf, ptr);
rec->io_width = btrfs_chunk_io_width(leaf, ptr);
rec->io_align = btrfs_chunk_io_align(leaf, ptr);
rec->sector_size = btrfs_chunk_sector_size(leaf, ptr);
rec->num_stripes = num_stripes;
rec->sub_stripes = btrfs_chunk_sub_stripes(leaf, ptr);
for (i = 0; i < rec->num_stripes; ++i) {
rec->stripes[i].devid =
btrfs_stripe_devid_nr(leaf, ptr, i);
rec->stripes[i].offset =
btrfs_stripe_offset_nr(leaf, ptr, i);
read_extent_buffer(leaf, rec->stripes[i].dev_uuid,
(unsigned long)btrfs_stripe_dev_uuid_nr(ptr, i),
BTRFS_UUID_SIZE);
}
return rec;
}
static int process_chunk_item(struct cache_tree *chunk_cache,
struct btrfs_key *key, struct extent_buffer *eb,
int slot)
{
struct chunk_record *rec;
int ret = 0;
rec = btrfs_new_chunk_record(eb, key, slot);
ret = insert_cache_extent(chunk_cache, &rec->cache);
if (ret) {
fprintf(stderr, "Chunk[%llu, %llu] existed.\n",
rec->offset, rec->length);
free(rec);
}
return ret;
}
static int process_device_item(struct rb_root *dev_cache,
struct btrfs_key *key, struct extent_buffer *eb, int slot)
{
struct btrfs_dev_item *ptr;
struct device_record *rec;
int ret = 0;
ptr = btrfs_item_ptr(eb,
slot, struct btrfs_dev_item);
rec = malloc(sizeof(*rec));
if (!rec) {
fprintf(stderr, "memory allocation failed\n");
return -ENOMEM;
}
rec->devid = key->offset;
rec->generation = btrfs_header_generation(eb);
rec->objectid = key->objectid;
rec->type = key->type;
rec->offset = key->offset;
rec->devid = btrfs_device_id(eb, ptr);
rec->total_byte = btrfs_device_total_bytes(eb, ptr);
rec->byte_used = btrfs_device_bytes_used(eb, ptr);
ret = rb_insert(dev_cache, &rec->node, device_record_compare);
if (ret) {
fprintf(stderr, "Device[%llu] existed.\n", rec->devid);
free(rec);
}
return ret;
}
struct block_group_record *
btrfs_new_block_group_record(struct extent_buffer *leaf, struct btrfs_key *key,
int slot)
{
struct btrfs_block_group_item *ptr;
struct block_group_record *rec;
rec = malloc(sizeof(*rec));
if (!rec) {
fprintf(stderr, "memory allocation failed\n");
exit(-1);
}
memset(rec, 0, sizeof(*rec));
rec->cache.start = key->objectid;
rec->cache.size = key->offset;
rec->generation = btrfs_header_generation(leaf);
rec->objectid = key->objectid;
rec->type = key->type;
rec->offset = key->offset;
ptr = btrfs_item_ptr(leaf, slot, struct btrfs_block_group_item);
rec->flags = btrfs_disk_block_group_flags(leaf, ptr);
INIT_LIST_HEAD(&rec->list);
return rec;
}
static int process_block_group_item(struct block_group_tree *block_group_cache,
struct btrfs_key *key,
struct extent_buffer *eb, int slot)
{
struct block_group_record *rec;
int ret = 0;
rec = btrfs_new_block_group_record(eb, key, slot);
ret = insert_block_group_record(block_group_cache, rec);
if (ret) {
fprintf(stderr, "Block Group[%llu, %llu] existed.\n",
rec->objectid, rec->offset);
free(rec);
}
return ret;
}
struct device_extent_record *
btrfs_new_device_extent_record(struct extent_buffer *leaf,
struct btrfs_key *key, int slot)
{
struct device_extent_record *rec;
struct btrfs_dev_extent *ptr;
rec = malloc(sizeof(*rec));
if (!rec) {
fprintf(stderr, "memory allocation failed\n");
exit(-1);
}
memset(rec, 0, sizeof(*rec));
rec->cache.objectid = key->objectid;
rec->cache.start = key->offset;
rec->generation = btrfs_header_generation(leaf);
rec->objectid = key->objectid;
rec->type = key->type;
rec->offset = key->offset;
ptr = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent);
rec->chunk_objecteid =
btrfs_dev_extent_chunk_objectid(leaf, ptr);
rec->chunk_offset =
btrfs_dev_extent_chunk_offset(leaf, ptr);
rec->length = btrfs_dev_extent_length(leaf, ptr);
rec->cache.size = rec->length;
INIT_LIST_HEAD(&rec->chunk_list);
INIT_LIST_HEAD(&rec->device_list);
return rec;
}
static int
process_device_extent_item(struct device_extent_tree *dev_extent_cache,
struct btrfs_key *key, struct extent_buffer *eb,
int slot)
{
struct device_extent_record *rec;
int ret;
rec = btrfs_new_device_extent_record(eb, key, slot);
ret = insert_device_extent_record(dev_extent_cache, rec);
if (ret) {
fprintf(stderr,
"Device extent[%llu, %llu, %llu] existed.\n",
rec->objectid, rec->offset, rec->length);
free(rec);
}
return ret;
}
static int process_extent_item(struct btrfs_root *root,
struct cache_tree *extent_cache,
struct extent_buffer *eb, int slot)
{
struct btrfs_extent_item *ei;
struct btrfs_extent_inline_ref *iref;
struct btrfs_extent_data_ref *dref;
struct btrfs_shared_data_ref *sref;
struct btrfs_key key;
unsigned long end;
unsigned long ptr;
int type;
u32 item_size = btrfs_item_size_nr(eb, slot);
u64 refs = 0;
u64 offset;
u64 num_bytes;
int metadata = 0;
btrfs_item_key_to_cpu(eb, &key, slot);
if (key.type == BTRFS_METADATA_ITEM_KEY) {
metadata = 1;
num_bytes = root->leafsize;
} else {
num_bytes = key.offset;
}
if (item_size < sizeof(*ei)) {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
struct btrfs_extent_item_v0 *ei0;
BUG_ON(item_size != sizeof(*ei0));
ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0);
refs = btrfs_extent_refs_v0(eb, ei0);
#else
BUG();
#endif
return add_extent_rec(extent_cache, NULL, 0, key.objectid,
num_bytes, refs, 0, 0, 0, metadata, 1,
num_bytes);
}
ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
refs = btrfs_extent_refs(eb, ei);
add_extent_rec(extent_cache, NULL, 0, key.objectid, num_bytes,
refs, 0, 0, 0, metadata, 1, num_bytes);
ptr = (unsigned long)(ei + 1);
if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK &&
key.type == BTRFS_EXTENT_ITEM_KEY)
ptr += sizeof(struct btrfs_tree_block_info);
end = (unsigned long)ei + item_size;
while (ptr < end) {
iref = (struct btrfs_extent_inline_ref *)ptr;
type = btrfs_extent_inline_ref_type(eb, iref);
offset = btrfs_extent_inline_ref_offset(eb, iref);
switch (type) {
case BTRFS_TREE_BLOCK_REF_KEY:
add_tree_backref(extent_cache, key.objectid,
0, offset, 0);
break;
case BTRFS_SHARED_BLOCK_REF_KEY:
add_tree_backref(extent_cache, key.objectid,
offset, 0, 0);
break;
case BTRFS_EXTENT_DATA_REF_KEY:
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
add_data_backref(extent_cache, key.objectid, 0,
btrfs_extent_data_ref_root(eb, dref),
btrfs_extent_data_ref_objectid(eb,
dref),
btrfs_extent_data_ref_offset(eb, dref),
btrfs_extent_data_ref_count(eb, dref),
0, num_bytes);
break;
case BTRFS_SHARED_DATA_REF_KEY:
sref = (struct btrfs_shared_data_ref *)(iref + 1);
add_data_backref(extent_cache, key.objectid, offset,
0, 0, 0,
btrfs_shared_data_ref_count(eb, sref),
0, num_bytes);
break;
default:
fprintf(stderr, "corrupt extent record: key %Lu %u %Lu\n",
key.objectid, key.type, num_bytes);
goto out;
}
ptr += btrfs_extent_inline_ref_size(type);
}
WARN_ON(ptr > end);
out:
return 0;
}
static int check_cache_range(struct btrfs_root *root,
struct btrfs_block_group_cache *cache,
u64 offset, u64 bytes)
{
struct btrfs_free_space *entry;
u64 *logical;
u64 bytenr;
int stripe_len;
int i, nr, ret;
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
bytenr = btrfs_sb_offset(i);
ret = btrfs_rmap_block(&root->fs_info->mapping_tree,
cache->key.objectid, bytenr, 0,
&logical, &nr, &stripe_len);
if (ret)
return ret;
while (nr--) {
if (logical[nr] + stripe_len <= offset)
continue;
if (offset + bytes <= logical[nr])
continue;
if (logical[nr] == offset) {
if (stripe_len >= bytes) {
kfree(logical);
return 0;
}
bytes -= stripe_len;
offset += stripe_len;
} else if (logical[nr] < offset) {
if (logical[nr] + stripe_len >=
offset + bytes) {
kfree(logical);
return 0;
}
bytes = (offset + bytes) -
(logical[nr] + stripe_len);
offset = logical[nr] + stripe_len;
} else {
/*
* Could be tricky, the super may land in the
* middle of the area we're checking. First
* check the easiest case, it's at the end.
*/
if (logical[nr] + stripe_len >=
bytes + offset) {
bytes = logical[nr] - offset;
continue;
}
/* Check the left side */
ret = check_cache_range(root, cache,
offset,
logical[nr] - offset);
if (ret) {
kfree(logical);
return ret;
}
/* Now we continue with the right side */
bytes = (offset + bytes) -
(logical[nr] + stripe_len);
offset = logical[nr] + stripe_len;
}
}
kfree(logical);
}
entry = btrfs_find_free_space(cache->free_space_ctl, offset, bytes);
if (!entry) {
fprintf(stderr, "There is no free space entry for %Lu-%Lu\n",
offset, offset+bytes);
return -EINVAL;
}
if (entry->offset != offset) {
fprintf(stderr, "Wanted offset %Lu, found %Lu\n", offset,
entry->offset);
return -EINVAL;
}
if (entry->bytes != bytes) {
fprintf(stderr, "Wanted bytes %Lu, found %Lu for off %Lu\n",
bytes, entry->bytes, offset);
return -EINVAL;
}
unlink_free_space(cache->free_space_ctl, entry);
free(entry);
return 0;
}
static int verify_space_cache(struct btrfs_root *root,
struct btrfs_block_group_cache *cache)
{
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
u64 last;
int ret = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
root = root->fs_info->extent_root;
last = max_t(u64, cache->key.objectid, BTRFS_SUPER_INFO_OFFSET);
key.objectid = last;
key.offset = 0;
key.type = BTRFS_EXTENT_ITEM_KEY;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
ret = 0;
while (1) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
break;
}
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid >= cache->key.offset + cache->key.objectid)
break;
if (key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY) {
path->slots[0]++;
continue;
}
if (last == key.objectid) {
if (key.type == BTRFS_EXTENT_ITEM_KEY)
last = key.objectid + key.offset;
else
last = key.objectid + root->leafsize;
path->slots[0]++;
continue;
}
ret = check_cache_range(root, cache, last,
key.objectid - last);
if (ret)
break;
if (key.type == BTRFS_EXTENT_ITEM_KEY)
last = key.objectid + key.offset;
else
last = key.objectid + root->leafsize;
path->slots[0]++;
}
if (last < cache->key.objectid + cache->key.offset)
ret = check_cache_range(root, cache, last,
cache->key.objectid +
cache->key.offset - last);
out:
btrfs_free_path(path);
if (!ret &&
!RB_EMPTY_ROOT(&cache->free_space_ctl->free_space_offset)) {
fprintf(stderr, "There are still entries left in the space "
"cache\n");
ret = -EINVAL;
}
return ret;
}
static int check_space_cache(struct btrfs_root *root)
{
struct btrfs_block_group_cache *cache;
u64 start = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE;
int ret;
int error = 0;
if (btrfs_super_cache_generation(root->fs_info->super_copy) != -1ULL &&
btrfs_super_generation(root->fs_info->super_copy) !=
btrfs_super_cache_generation(root->fs_info->super_copy)) {
printf("cache and super generation don't match, space cache "
"will be invalidated\n");
return 0;
}
while (1) {
cache = btrfs_lookup_first_block_group(root->fs_info, start);
if (!cache)
break;
start = cache->key.objectid + cache->key.offset;
if (!cache->free_space_ctl) {
if (btrfs_init_free_space_ctl(cache,
root->sectorsize)) {
ret = -ENOMEM;
break;
}
} else {
btrfs_remove_free_space_cache(cache);
}
ret = load_free_space_cache(root->fs_info, cache);
if (!ret)
continue;
ret = verify_space_cache(root, cache);
if (ret) {
fprintf(stderr, "cache appears valid but isnt %Lu\n",
cache->key.objectid);
error++;
}
}
return error ? -EINVAL : 0;
}
static int check_extent_csums(struct btrfs_root *root, u64 bytenr,
u64 num_bytes, unsigned long leaf_offset,
struct extent_buffer *eb) {
u64 offset = 0;
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
char *data;
unsigned long csum_offset;
u32 csum;
u32 csum_expected;
u64 read_len;
u64 data_checked = 0;
u64 tmp;
int ret = 0;
int mirror;
int num_copies;
if (num_bytes % root->sectorsize)
return -EINVAL;
data = malloc(num_bytes);
if (!data)
return -ENOMEM;
while (offset < num_bytes) {
mirror = 0;
again:
read_len = num_bytes - offset;
/* read as much space once a time */
ret = read_extent_data(root, data + offset,
bytenr + offset, &read_len, mirror);
if (ret)
goto out;
data_checked = 0;
/* verify every 4k data's checksum */
while (data_checked < read_len) {
csum = ~(u32)0;
tmp = offset + data_checked;
csum = btrfs_csum_data(NULL, (char *)data + tmp,
csum, root->sectorsize);
btrfs_csum_final(csum, (char *)&csum);
csum_offset = leaf_offset +
tmp / root->sectorsize * csum_size;
read_extent_buffer(eb, (char *)&csum_expected,
csum_offset, csum_size);
/* try another mirror */
if (csum != csum_expected) {
fprintf(stderr, "mirror %d bytenr %llu csum %u expected csum %u\n",
mirror, bytenr + tmp,
csum, csum_expected);
num_copies = btrfs_num_copies(
&root->fs_info->mapping_tree,
bytenr, num_bytes);
if (mirror < num_copies - 1) {
mirror += 1;
goto again;
}
}
data_checked += root->sectorsize;
}
offset += read_len;
}
out:
free(data);
return ret;
}
static int check_extent_exists(struct btrfs_root *root, u64 bytenr,
u64 num_bytes)
{
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
int ret;
path = btrfs_alloc_path();
if (!path) {
fprintf(stderr, "Error allocing path\n");
return -ENOMEM;
}
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = (u64)-1;
again:
ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path,
0, 0);
if (ret < 0) {
fprintf(stderr, "Error looking up extent record %d\n", ret);
btrfs_free_path(path);
return ret;
} else if (ret) {
if (path->slots[0] > 0) {
path->slots[0]--;
} else {
ret = btrfs_prev_leaf(root, path);
if (ret < 0) {
goto out;
} else if (ret > 0) {
ret = 0;
goto out;
}
}
}
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
/*
* Block group items come before extent items if they have the same
* bytenr, so walk back one more just in case. Dear future traveler,
* first congrats on mastering time travel. Now if it's not too much
* trouble could you go back to 2006 and tell Chris to make the
* BLOCK_GROUP_ITEM_KEY (and BTRFS_*_REF_KEY) lower than the
* EXTENT_ITEM_KEY please?
*/
while (key.type > BTRFS_EXTENT_ITEM_KEY) {
if (path->slots[0] > 0) {
path->slots[0]--;
} else {
ret = btrfs_prev_leaf(root, path);
if (ret < 0) {
goto out;
} else if (ret > 0) {
ret = 0;
goto out;
}
}
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
}
while (num_bytes) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret < 0) {
fprintf(stderr, "Error going to next leaf "
"%d\n", ret);
btrfs_free_path(path);
return ret;
} else if (ret) {
break;
}
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.type != BTRFS_EXTENT_ITEM_KEY) {
path->slots[0]++;
continue;
}
if (key.objectid + key.offset < bytenr) {
path->slots[0]++;
continue;
}
if (key.objectid > bytenr + num_bytes)
break;
if (key.objectid == bytenr) {
if (key.offset >= num_bytes) {
num_bytes = 0;
break;
}
num_bytes -= key.offset;
bytenr += key.offset;
} else if (key.objectid < bytenr) {
if (key.objectid + key.offset >= bytenr + num_bytes) {
num_bytes = 0;
break;
}
num_bytes = (bytenr + num_bytes) -
(key.objectid + key.offset);
bytenr = key.objectid + key.offset;
} else {
if (key.objectid + key.offset < bytenr + num_bytes) {
u64 new_start = key.objectid + key.offset;
u64 new_bytes = bytenr + num_bytes - new_start;
/*
* Weird case, the extent is in the middle of
* our range, we'll have to search one side
* and then the other. Not sure if this happens
* in real life, but no harm in coding it up
* anyway just in case.
*/
btrfs_release_path(path);
ret = check_extent_exists(root, new_start,
new_bytes);
if (ret) {
fprintf(stderr, "Right section didn't "
"have a record\n");
break;
}
num_bytes = key.objectid - bytenr;
goto again;
}
num_bytes = key.objectid - bytenr;
}
path->slots[0]++;
}
ret = 0;
out:
if (num_bytes && !ret) {
fprintf(stderr, "There are no extents for csum range "
"%Lu-%Lu\n", bytenr, bytenr+num_bytes);
ret = 1;
}
btrfs_free_path(path);
return ret;
}
static int check_csums(struct btrfs_root *root)
{
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
u64 offset = 0, num_bytes = 0;
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
int errors = 0;
int ret;
u64 data_len;
unsigned long leaf_offset;
root = root->fs_info->csum_root;
if (!extent_buffer_uptodate(root->node)) {
fprintf(stderr, "No valid csum tree found\n");
return -ENOENT;
}
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
key.type = BTRFS_EXTENT_CSUM_KEY;
key.offset = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
fprintf(stderr, "Error searching csum tree %d\n", ret);
btrfs_free_path(path);
return ret;
}
if (ret > 0 && path->slots[0])
path->slots[0]--;
ret = 0;
while (1) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret < 0) {
fprintf(stderr, "Error going to next leaf "
"%d\n", ret);
break;
}
if (ret)
break;
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.type != BTRFS_EXTENT_CSUM_KEY) {
path->slots[0]++;
continue;
}
data_len = (btrfs_item_size_nr(leaf, path->slots[0]) /
csum_size) * root->sectorsize;
if (!check_data_csum)
goto skip_csum_check;
leaf_offset = btrfs_item_ptr_offset(leaf, path->slots[0]);
ret = check_extent_csums(root, key.offset, data_len,
leaf_offset, leaf);
if (ret)
break;
skip_csum_check:
if (!num_bytes) {
offset = key.offset;
} else if (key.offset != offset + num_bytes) {
ret = check_extent_exists(root, offset, num_bytes);
if (ret) {
fprintf(stderr, "Csum exists for %Lu-%Lu but "
"there is no extent record\n",
offset, offset+num_bytes);
errors++;
}
offset = key.offset;
num_bytes = 0;
}
num_bytes += data_len;
path->slots[0]++;
}
btrfs_free_path(path);
return errors;
}
static int is_dropped_key(struct btrfs_key *key,
struct btrfs_key *drop_key) {
if (key->objectid < drop_key->objectid)
return 1;
else if (key->objectid == drop_key->objectid) {
if (key->type < drop_key->type)
return 1;
else if (key->type == drop_key->type) {
if (key->offset < drop_key->offset)
return 1;
}
}
return 0;
}
/*
* Here are the rules for FULL_BACKREF.
*
* 1) If BTRFS_HEADER_FLAG_RELOC is set then we have FULL_BACKREF set.
* 2) If btrfs_header_owner(buf) no longer points to buf then we have
* FULL_BACKREF set.
* 3) We cow'ed the block walking down a reloc tree. This is impossible to tell
* if it happened after the relocation occurred since we'll have dropped the
* reloc root, so it's entirely possible to have FULL_BACKREF set on buf and
* have no real way to know for sure.
*
* We process the blocks one root at a time, and we start from the lowest root
* objectid and go to the highest. So we can just lookup the owner backref for
* the record and if we don't find it then we know it doesn't exist and we have
* a FULL BACKREF.
*
* FIXME: if we ever start reclaiming root objectid's then we need to fix this
* assumption and simply indicate that we _think_ that the FULL BACKREF needs to
* be set or not and then we can check later once we've gathered all the refs.
*/
static int calc_extent_flag(struct btrfs_root *root,
struct cache_tree *extent_cache,
struct extent_buffer *buf,
struct root_item_record *ri,
u64 *flags)
{
struct extent_record *rec;
struct cache_extent *cache;
struct tree_backref *tback;
u64 owner = 0;
cache = lookup_cache_extent(extent_cache, buf->start, 1);
/* we have added this extent before */
BUG_ON(!cache);
rec = container_of(cache, struct extent_record, cache);
/*
* Except file/reloc tree, we can not have
* FULL BACKREF MODE
*/
if (ri->objectid < BTRFS_FIRST_FREE_OBJECTID)
goto normal;
/*
* root node
*/
if (buf->start == ri->bytenr)
goto normal;
if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC))
goto full_backref;
owner = btrfs_header_owner(buf);
if (owner == ri->objectid)
goto normal;
tback = find_tree_backref(rec, 0, owner);
if (!tback)
goto full_backref;
normal:
*flags = 0;
if (rec->flag_block_full_backref != -1 &&
rec->flag_block_full_backref != 0)
rec->bad_full_backref = 1;
return 0;
full_backref:
*flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
if (rec->flag_block_full_backref != -1 &&
rec->flag_block_full_backref != 1)
rec->bad_full_backref = 1;
return 0;
}
static int run_next_block(struct btrfs_root *root,
struct block_info *bits,
int bits_nr,
u64 *last,
struct cache_tree *pending,
struct cache_tree *seen,
struct cache_tree *reada,
struct cache_tree *nodes,
struct cache_tree *extent_cache,
struct cache_tree *chunk_cache,
struct rb_root *dev_cache,
struct block_group_tree *block_group_cache,
struct device_extent_tree *dev_extent_cache,
struct root_item_record *ri)
{
struct extent_buffer *buf;
struct extent_record *rec = NULL;
u64 bytenr;
u32 size;
u64 parent;
u64 owner;
u64 flags;
u64 ptr;
u64 gen = 0;
int ret = 0;
int i;
int nritems;
struct btrfs_key key;
struct cache_extent *cache;
int reada_bits;
nritems = pick_next_pending(pending, reada, nodes, *last, bits,
bits_nr, &reada_bits);
if (nritems == 0)
return 1;
if (!reada_bits) {
for(i = 0; i < nritems; i++) {
ret = add_cache_extent(reada, bits[i].start,
bits[i].size);
if (ret == -EEXIST)
continue;
/* fixme, get the parent transid */
readahead_tree_block(root, bits[i].start,
bits[i].size, 0);
}
}
*last = bits[0].start;
bytenr = bits[0].start;
size = bits[0].size;
cache = lookup_cache_extent(pending, bytenr, size);
if (cache) {
remove_cache_extent(pending, cache);
free(cache);
}
cache = lookup_cache_extent(reada, bytenr, size);
if (cache) {
remove_cache_extent(reada, cache);
free(cache);
}
cache = lookup_cache_extent(nodes, bytenr, size);
if (cache) {
remove_cache_extent(nodes, cache);
free(cache);
}
cache = lookup_cache_extent(extent_cache, bytenr, size);
if (cache) {
rec = container_of(cache, struct extent_record, cache);
gen = rec->parent_generation;
}
/* fixme, get the real parent transid */
buf = read_tree_block(root, bytenr, size, gen);
if (!extent_buffer_uptodate(buf)) {
record_bad_block_io(root->fs_info,
extent_cache, bytenr, size);
goto out;
}
nritems = btrfs_header_nritems(buf);
flags = 0;
if (!init_extent_tree) {
ret = btrfs_lookup_extent_info(NULL, root, bytenr,
btrfs_header_level(buf), 1, NULL,
&flags);
if (ret < 0) {
ret = calc_extent_flag(root, extent_cache, buf, ri, &flags);
if (ret < 0) {
fprintf(stderr, "Couldn't calc extent flags\n");
flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
}
}
} else {
flags = 0;
ret = calc_extent_flag(root, extent_cache, buf, ri, &flags);
if (ret < 0) {
fprintf(stderr, "Couldn't calc extent flags\n");
flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
}
}
if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
if (ri != NULL &&
ri->objectid != BTRFS_TREE_RELOC_OBJECTID &&
ri->objectid == btrfs_header_owner(buf)) {
/*
* Ok we got to this block from it's original owner and
* we have FULL_BACKREF set. Relocation can leave
* converted blocks over so this is altogether possible,
* however it's not possible if the generation > the
* last snapshot, so check for this case.
*/
if (!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC) &&
btrfs_header_generation(buf) > ri->last_snapshot) {
flags &= ~BTRFS_BLOCK_FLAG_FULL_BACKREF;
rec->bad_full_backref = 1;
}
}
} else {
if (ri != NULL &&
(ri->objectid == BTRFS_TREE_RELOC_OBJECTID ||
btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC))) {
flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
rec->bad_full_backref = 1;
}
}
if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
rec->flag_block_full_backref = 1;
parent = bytenr;
owner = 0;
} else {
rec->flag_block_full_backref = 0;
parent = 0;
owner = btrfs_header_owner(buf);
}
ret = check_block(root, extent_cache, buf, flags);
if (ret)
goto out;
if (btrfs_is_leaf(buf)) {
btree_space_waste += btrfs_leaf_free_space(root, buf);
for (i = 0; i < nritems; i++) {
struct btrfs_file_extent_item *fi;
btrfs_item_key_to_cpu(buf, &key, i);
if (key.type == BTRFS_EXTENT_ITEM_KEY) {
process_extent_item(root, extent_cache, buf,
i);
continue;
}
if (key.type == BTRFS_METADATA_ITEM_KEY) {
process_extent_item(root, extent_cache, buf,
i);
continue;
}
if (key.type == BTRFS_EXTENT_CSUM_KEY) {
total_csum_bytes +=
btrfs_item_size_nr(buf, i);
continue;
}
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
process_chunk_item(chunk_cache, &key, buf, i);
continue;
}
if (key.type == BTRFS_DEV_ITEM_KEY) {
process_device_item(dev_cache, &key, buf, i);
continue;
}
if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
process_block_group_item(block_group_cache,
&key, buf, i);
continue;
}
if (key.type == BTRFS_DEV_EXTENT_KEY) {
process_device_extent_item(dev_extent_cache,
&key, buf, i);
continue;
}
if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
process_extent_ref_v0(extent_cache, buf, i);
#else
BUG();
#endif
continue;
}
if (key.type == BTRFS_TREE_BLOCK_REF_KEY) {
add_tree_backref(extent_cache, key.objectid, 0,
key.offset, 0);
continue;
}
if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) {
add_tree_backref(extent_cache, key.objectid,
key.offset, 0, 0);
continue;
}
if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
struct btrfs_extent_data_ref *ref;
ref = btrfs_item_ptr(buf, i,
struct btrfs_extent_data_ref);
add_data_backref(extent_cache,
key.objectid, 0,
btrfs_extent_data_ref_root(buf, ref),
btrfs_extent_data_ref_objectid(buf,
ref),
btrfs_extent_data_ref_offset(buf, ref),
btrfs_extent_data_ref_count(buf, ref),
0, root->sectorsize);
continue;
}
if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
struct btrfs_shared_data_ref *ref;
ref = btrfs_item_ptr(buf, i,
struct btrfs_shared_data_ref);
add_data_backref(extent_cache,
key.objectid, key.offset, 0, 0, 0,
btrfs_shared_data_ref_count(buf, ref),
0, root->sectorsize);
continue;
}
if (key.type == BTRFS_ORPHAN_ITEM_KEY) {
struct bad_item *bad;
if (key.objectid == BTRFS_ORPHAN_OBJECTID)
continue;
if (!owner)
continue;
bad = malloc(sizeof(struct bad_item));
if (!bad)
continue;
INIT_LIST_HEAD(&bad->list);
memcpy(&bad->key, &key,
sizeof(struct btrfs_key));
bad->root_id = owner;
list_add_tail(&bad->list, &delete_items);
continue;
}
if (key.type != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(buf, i,
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(buf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
if (btrfs_file_extent_disk_bytenr(buf, fi) == 0)
continue;
data_bytes_allocated +=
btrfs_file_extent_disk_num_bytes(buf, fi);
if (data_bytes_allocated < root->sectorsize) {
abort();
}
data_bytes_referenced +=
btrfs_file_extent_num_bytes(buf, fi);
add_data_backref(extent_cache,
btrfs_file_extent_disk_bytenr(buf, fi),
parent, owner, key.objectid, key.offset -
btrfs_file_extent_offset(buf, fi), 1, 1,
btrfs_file_extent_disk_num_bytes(buf, fi));
}
} else {
int level;
struct btrfs_key first_key;
first_key.objectid = 0;
if (nritems > 0)
btrfs_item_key_to_cpu(buf, &first_key, 0);
level = btrfs_header_level(buf);
for (i = 0; i < nritems; i++) {
ptr = btrfs_node_blockptr(buf, i);
size = btrfs_level_size(root, level - 1);
btrfs_node_key_to_cpu(buf, &key, i);
if (ri != NULL) {
if ((level == ri->drop_level)
&& is_dropped_key(&key, &ri->drop_key)) {
continue;
}
}
ret = add_extent_rec(extent_cache, &key,
btrfs_node_ptr_generation(buf, i),
ptr, size, 0, 0, 1, 0, 1, 0,
size);
BUG_ON(ret);
add_tree_backref(extent_cache, ptr, parent, owner, 1);
if (level > 1) {
add_pending(nodes, seen, ptr, size);
} else {
add_pending(pending, seen, ptr, size);
}
}
btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(root) -
nritems) * sizeof(struct btrfs_key_ptr);
}
total_btree_bytes += buf->len;
if (fs_root_objectid(btrfs_header_owner(buf)))
total_fs_tree_bytes += buf->len;
if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID)
total_extent_tree_bytes += buf->len;
if (!found_old_backref &&
btrfs_header_owner(buf) == BTRFS_TREE_RELOC_OBJECTID &&
btrfs_header_backref_rev(buf) == BTRFS_MIXED_BACKREF_REV &&
!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC))
found_old_backref = 1;
out:
free_extent_buffer(buf);
return ret;
}
static int add_root_to_pending(struct extent_buffer *buf,
struct cache_tree *extent_cache,
struct cache_tree *pending,
struct cache_tree *seen,
struct cache_tree *nodes,
u64 objectid)
{
if (btrfs_header_level(buf) > 0)
add_pending(nodes, seen, buf->start, buf->len);
else
add_pending(pending, seen, buf->start, buf->len);
add_extent_rec(extent_cache, NULL, 0, buf->start, buf->len,
0, 1, 1, 0, 1, 0, buf->len);
if (objectid == BTRFS_TREE_RELOC_OBJECTID ||
btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
add_tree_backref(extent_cache, buf->start, buf->start,
0, 1);
else
add_tree_backref(extent_cache, buf->start, 0, objectid, 1);
return 0;
}
/* as we fix the tree, we might be deleting blocks that
* we're tracking for repair. This hook makes sure we
* remove any backrefs for blocks as we are fixing them.
*/
static int free_extent_hook(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner, u64 offset,
int refs_to_drop)
{
struct extent_record *rec;
struct cache_extent *cache;
int is_data;
struct cache_tree *extent_cache = root->fs_info->fsck_extent_cache;
is_data = owner >= BTRFS_FIRST_FREE_OBJECTID;
cache = lookup_cache_extent(extent_cache, bytenr, num_bytes);
if (!cache)
return 0;
rec = container_of(cache, struct extent_record, cache);
if (is_data) {
struct data_backref *back;
back = find_data_backref(rec, parent, root_objectid, owner,
offset, 1, bytenr, num_bytes);
if (!back)
goto out;
if (back->node.found_ref) {
back->found_ref -= refs_to_drop;
if (rec->refs)
rec->refs -= refs_to_drop;
}
if (back->node.found_extent_tree) {
back->num_refs -= refs_to_drop;
if (rec->extent_item_refs)
rec->extent_item_refs -= refs_to_drop;
}
if (back->found_ref == 0)
back->node.found_ref = 0;
if (back->num_refs == 0)
back->node.found_extent_tree = 0;
if (!back->node.found_extent_tree && back->node.found_ref) {
list_del(&back->node.list);
free(back);
}
} else {
struct tree_backref *back;
back = find_tree_backref(rec, parent, root_objectid);
if (!back)
goto out;
if (back->node.found_ref) {
if (rec->refs)
rec->refs--;
back->node.found_ref = 0;
}
if (back->node.found_extent_tree) {
if (rec->extent_item_refs)
rec->extent_item_refs--;
back->node.found_extent_tree = 0;
}
if (!back->node.found_extent_tree && back->node.found_ref) {
list_del(&back->node.list);
free(back);
}
}
maybe_free_extent_rec(extent_cache, rec);
out:
return 0;
}
static int delete_extent_records(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 bytenr, u64 new_len)
{
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
int ret;
int slot;
key.objectid = bytenr;
key.type = (u8)-1;
key.offset = (u64)-1;
while(1) {
ret = btrfs_search_slot(trans, root->fs_info->extent_root,
&key, path, 0, 1);
if (ret < 0)
break;
if (ret > 0) {
ret = 0;
if (path->slots[0] == 0)
break;
path->slots[0]--;
}
ret = 0;
leaf = path->nodes[0];
slot = path->slots[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid != bytenr)
break;
if (found_key.type != BTRFS_EXTENT_ITEM_KEY &&
found_key.type != BTRFS_METADATA_ITEM_KEY &&
found_key.type != BTRFS_TREE_BLOCK_REF_KEY &&
found_key.type != BTRFS_EXTENT_DATA_REF_KEY &&
found_key.type != BTRFS_EXTENT_REF_V0_KEY &&
found_key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
found_key.type != BTRFS_SHARED_DATA_REF_KEY) {
btrfs_release_path(path);
if (found_key.type == 0) {
if (found_key.offset == 0)
break;
key.offset = found_key.offset - 1;
key.type = found_key.type;
}
key.type = found_key.type - 1;
key.offset = (u64)-1;
continue;
}
fprintf(stderr, "repair deleting extent record: key %Lu %u %Lu\n",
found_key.objectid, found_key.type, found_key.offset);
ret = btrfs_del_item(trans, root->fs_info->extent_root, path);
if (ret)
break;
btrfs_release_path(path);
if (found_key.type == BTRFS_EXTENT_ITEM_KEY ||
found_key.type == BTRFS_METADATA_ITEM_KEY) {
u64 bytes = (found_key.type == BTRFS_EXTENT_ITEM_KEY) ?
found_key.offset : root->leafsize;
ret = btrfs_update_block_group(trans, root, bytenr,
bytes, 0, 0);
if (ret)
break;
}
}
btrfs_release_path(path);
return ret;
}
/*
* for a single backref, this will allocate a new extent
* and add the backref to it.
*/
static int record_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *info,
struct btrfs_path *path,
struct extent_record *rec,
struct extent_backref *back,
int allocated, u64 flags)
{
int ret;
struct btrfs_root *extent_root = info->extent_root;
struct extent_buffer *leaf;
struct btrfs_key ins_key;
struct btrfs_extent_item *ei;
struct tree_backref *tback;
struct data_backref *dback;
struct btrfs_tree_block_info *bi;
if (!back->is_data)
rec->max_size = max_t(u64, rec->max_size,
info->extent_root->leafsize);
if (!allocated) {
u32 item_size = sizeof(*ei);
if (!back->is_data)
item_size += sizeof(*bi);
ins_key.objectid = rec->start;
ins_key.offset = rec->max_size;
ins_key.type = BTRFS_EXTENT_ITEM_KEY;
ret = btrfs_insert_empty_item(trans, extent_root, path,
&ins_key, item_size);
if (ret)
goto fail;
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
btrfs_set_extent_refs(leaf, ei, 0);
btrfs_set_extent_generation(leaf, ei, rec->generation);
if (back->is_data) {
btrfs_set_extent_flags(leaf, ei,
BTRFS_EXTENT_FLAG_DATA);
} else {
struct btrfs_disk_key copy_key;;
tback = (struct tree_backref *)back;
bi = (struct btrfs_tree_block_info *)(ei + 1);
memset_extent_buffer(leaf, 0, (unsigned long)bi,
sizeof(*bi));
btrfs_set_disk_key_objectid(©_key,
rec->info_objectid);
btrfs_set_disk_key_type(©_key, 0);
btrfs_set_disk_key_offset(©_key, 0);
btrfs_set_tree_block_level(leaf, bi, rec->info_level);
btrfs_set_tree_block_key(leaf, bi, ©_key);
btrfs_set_extent_flags(leaf, ei,
BTRFS_EXTENT_FLAG_TREE_BLOCK | flags);
}
btrfs_mark_buffer_dirty(leaf);
ret = btrfs_update_block_group(trans, extent_root, rec->start,
rec->max_size, 1, 0);
if (ret)
goto fail;
btrfs_release_path(path);
}
if (back->is_data) {
u64 parent;
int i;
dback = (struct data_backref *)back;
if (back->full_backref)
parent = dback->parent;
else
parent = 0;
for (i = 0; i < dback->found_ref; i++) {
/* if parent != 0, we're doing a full backref
* passing BTRFS_FIRST_FREE_OBJECTID as the owner
* just makes the backref allocator create a data
* backref
*/
ret = btrfs_inc_extent_ref(trans, info->extent_root,
rec->start, rec->max_size,
parent,
dback->root,
parent ?
BTRFS_FIRST_FREE_OBJECTID :
dback->owner,
dback->offset);
if (ret)
break;
}
fprintf(stderr, "adding new data backref"
" on %llu %s %llu owner %llu"
" offset %llu found %d\n",
(unsigned long long)rec->start,
back->full_backref ?
"parent" : "root",
back->full_backref ?
(unsigned long long)parent :
(unsigned long long)dback->root,
(unsigned long long)dback->owner,
(unsigned long long)dback->offset,
dback->found_ref);
} else {
u64 parent;
tback = (struct tree_backref *)back;
if (back->full_backref)
parent = tback->parent;
else
parent = 0;
ret = btrfs_inc_extent_ref(trans, info->extent_root,
rec->start, rec->max_size,
parent, tback->root, 0, 0);
fprintf(stderr, "adding new tree backref on "
"start %llu len %llu parent %llu root %llu\n",
rec->start, rec->max_size, parent, tback->root);
}
if (ret)
goto fail;
fail:
btrfs_release_path(path);
return ret;
}
struct extent_entry {
u64 bytenr;
u64 bytes;
int count;
int broken;
struct list_head list;
};
static struct extent_entry *find_entry(struct list_head *entries,
u64 bytenr, u64 bytes)
{
struct extent_entry *entry = NULL;
list_for_each_entry(entry, entries, list) {
if (entry->bytenr == bytenr && entry->bytes == bytes)
return entry;
}
return NULL;
}
static struct extent_entry *find_most_right_entry(struct list_head *entries)
{
struct extent_entry *entry, *best = NULL, *prev = NULL;
list_for_each_entry(entry, entries, list) {
if (!prev) {
prev = entry;
continue;
}
/*
* If there are as many broken entries as entries then we know
* not to trust this particular entry.
*/
if (entry->broken == entry->count)
continue;
/*
* If our current entry == best then we can't be sure our best
* is really the best, so we need to keep searching.
*/
if (best && best->count == entry->count) {
prev = entry;
best = NULL;
continue;
}
/* Prev == entry, not good enough, have to keep searching */
if (!prev->broken && prev->count == entry->count)
continue;
if (!best)
best = (prev->count > entry->count) ? prev : entry;
else if (best->count < entry->count)
best = entry;
prev = entry;
}
return best;
}
static int repair_ref(struct btrfs_fs_info *info, struct btrfs_path *path,
struct data_backref *dback, struct extent_entry *entry)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root;
struct btrfs_file_extent_item *fi;
struct extent_buffer *leaf;
struct btrfs_key key;
u64 bytenr, bytes;
int ret, err;
key.objectid = dback->root;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root(info, &key);
if (IS_ERR(root)) {
fprintf(stderr, "Couldn't find root for our ref\n");
return -EINVAL;
}
/*
* The backref points to the original offset of the extent if it was
* split, so we need to search down to the offset we have and then walk
* forward until we find the backref we're looking for.
*/
key.objectid = dback->owner;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = dback->offset;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
fprintf(stderr, "Error looking up ref %d\n", ret);
return ret;
}
while (1) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret) {
fprintf(stderr, "Couldn't find our ref, next\n");
return -EINVAL;
}
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid != dback->owner ||
key.type != BTRFS_EXTENT_DATA_KEY) {
fprintf(stderr, "Couldn't find our ref, search\n");
return -EINVAL;
}
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
if (bytenr == dback->disk_bytenr && bytes == dback->bytes)
break;
path->slots[0]++;
}
btrfs_release_path(path);
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans))
return PTR_ERR(trans);
/*
* Ok we have the key of the file extent we want to fix, now we can cow
* down to the thing and fix it.
*/
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
fprintf(stderr, "Error cowing down to ref [%Lu, %u, %Lu]: %d\n",
key.objectid, key.type, key.offset, ret);
goto out;
}
if (ret > 0) {
fprintf(stderr, "Well that's odd, we just found this key "
"[%Lu, %u, %Lu]\n", key.objectid, key.type,
key.offset);
ret = -EINVAL;
goto out;
}
leaf = path->nodes[0];
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
if (btrfs_file_extent_compression(leaf, fi) &&
dback->disk_bytenr != entry->bytenr) {
fprintf(stderr, "Ref doesn't match the record start and is "
"compressed, please take a btrfs-image of this file "
"system and send it to a btrfs developer so they can "
"complete this functionality for bytenr %Lu\n",
dback->disk_bytenr);
ret = -EINVAL;
goto out;
}
if (dback->node.broken && dback->disk_bytenr != entry->bytenr) {
btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr);
} else if (dback->disk_bytenr > entry->bytenr) {
u64 off_diff, offset;
off_diff = dback->disk_bytenr - entry->bytenr;
offset = btrfs_file_extent_offset(leaf, fi);
if (dback->disk_bytenr + offset +
btrfs_file_extent_num_bytes(leaf, fi) >
entry->bytenr + entry->bytes) {
fprintf(stderr, "Ref is past the entry end, please "
"take a btrfs-image of this file system and "
"send it to a btrfs developer, ref %Lu\n",
dback->disk_bytenr);
ret = -EINVAL;
goto out;
}
offset += off_diff;
btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr);
btrfs_set_file_extent_offset(leaf, fi, offset);
} else if (dback->disk_bytenr < entry->bytenr) {
u64 offset;
offset = btrfs_file_extent_offset(leaf, fi);
if (dback->disk_bytenr + offset < entry->bytenr) {
fprintf(stderr, "Ref is before the entry start, please"
" take a btrfs-image of this file system and "
"send it to a btrfs developer, ref %Lu\n",
dback->disk_bytenr);
ret = -EINVAL;
goto out;
}
offset += dback->disk_bytenr;
offset -= entry->bytenr;
btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr);
btrfs_set_file_extent_offset(leaf, fi, offset);
}
btrfs_set_file_extent_disk_num_bytes(leaf, fi, entry->bytes);
/*
* Chances are if disk_num_bytes were wrong then so is ram_bytes, but
* only do this if we aren't using compression, otherwise it's a
* trickier case.
*/
if (!btrfs_file_extent_compression(leaf, fi))
btrfs_set_file_extent_ram_bytes(leaf, fi, entry->bytes);
else
printf("ram bytes may be wrong?\n");
btrfs_mark_buffer_dirty(leaf);
out:
err = btrfs_commit_transaction(trans, root);
btrfs_release_path(path);
return ret ? ret : err;
}
static int verify_backrefs(struct btrfs_fs_info *info, struct btrfs_path *path,
struct extent_record *rec)
{
struct extent_backref *back;
struct data_backref *dback;
struct extent_entry *entry, *best = NULL;
LIST_HEAD(entries);
int nr_entries = 0;
int broken_entries = 0;
int ret = 0;
short mismatch = 0;
/*
* Metadata is easy and the backrefs should always agree on bytenr and
* size, if not we've got bigger issues.
*/
if (rec->metadata)
return 0;
list_for_each_entry(back, &rec->backrefs, list) {
if (back->full_backref || !back->is_data)
continue;
dback = (struct data_backref *)back;
/*
* We only pay attention to backrefs that we found a real
* backref for.
*/
if (dback->found_ref == 0)
continue;
/*
* For now we only catch when the bytes don't match, not the
* bytenr. We can easily do this at the same time, but I want
* to have a fs image to test on before we just add repair
* functionality willy-nilly so we know we won't screw up the
* repair.
*/
entry = find_entry(&entries, dback->disk_bytenr,
dback->bytes);
if (!entry) {
entry = malloc(sizeof(struct extent_entry));
if (!entry) {
ret = -ENOMEM;
goto out;
}
memset(entry, 0, sizeof(*entry));
entry->bytenr = dback->disk_bytenr;
entry->bytes = dback->bytes;
list_add_tail(&entry->list, &entries);
nr_entries++;
}
/*
* If we only have on entry we may think the entries agree when
* in reality they don't so we have to do some extra checking.
*/
if (dback->disk_bytenr != rec->start ||
dback->bytes != rec->nr || back->broken)
mismatch = 1;
if (back->broken) {
entry->broken++;
broken_entries++;
}
entry->count++;
}
/* Yay all the backrefs agree, carry on good sir */
if (nr_entries <= 1 && !mismatch)
goto out;
fprintf(stderr, "attempting to repair backref discrepency for bytenr "
"%Lu\n", rec->start);
/*
* First we want to see if the backrefs can agree amongst themselves who
* is right, so figure out which one of the entries has the highest
* count.
*/
best = find_most_right_entry(&entries);
/*
* Ok so we may have an even split between what the backrefs think, so
* this is where we use the extent ref to see what it thinks.
*/
if (!best) {
entry = find_entry(&entries, rec->start, rec->nr);
if (!entry && (!broken_entries || !rec->found_rec)) {
fprintf(stderr, "Backrefs don't agree with each other "
"and extent record doesn't agree with anybody,"
" so we can't fix bytenr %Lu bytes %Lu\n",
rec->start, rec->nr);
ret = -EINVAL;
goto out;
} else if (!entry) {
/*
* Ok our backrefs were broken, we'll assume this is the
* correct value and add an entry for this range.
*/
entry = malloc(sizeof(struct extent_entry));
if (!entry) {
ret = -ENOMEM;
goto out;
}
memset(entry, 0, sizeof(*entry));
entry->bytenr = rec->start;
entry->bytes = rec->nr;
list_add_tail(&entry->list, &entries);
nr_entries++;
}
entry->count++;
best = find_most_right_entry(&entries);
if (!best) {
fprintf(stderr, "Backrefs and extent record evenly "
"split on who is right, this is going to "
"require user input to fix bytenr %Lu bytes "
"%Lu\n", rec->start, rec->nr);
ret = -EINVAL;
goto out;
}
}
/*
* I don't think this can happen currently as we'll abort() if we catch
* this case higher up, but in case somebody removes that we still can't
* deal with it properly here yet, so just bail out of that's the case.
*/
if (best->bytenr != rec->start) {
fprintf(stderr, "Extent start and backref starts don't match, "
"please use btrfs-image on this file system and send "
"it to a btrfs developer so they can make fsck fix "
"this particular case. bytenr is %Lu, bytes is %Lu\n",
rec->start, rec->nr);
ret = -EINVAL;
goto out;
}
/*
* Ok great we all agreed on an extent record, let's go find the real
* references and fix up the ones that don't match.
*/
list_for_each_entry(back, &rec->backrefs, list) {
if (back->full_backref || !back->is_data)
continue;
dback = (struct data_backref *)back;
/*
* Still ignoring backrefs that don't have a real ref attached
* to them.
*/
if (dback->found_ref == 0)
continue;
if (dback->bytes == best->bytes &&
dback->disk_bytenr == best->bytenr)
continue;
ret = repair_ref(info, path, dback, best);
if (ret)
goto out;
}
/*
* Ok we messed with the actual refs, which means we need to drop our
* entire cache and go back and rescan. I know this is a huge pain and
* adds a lot of extra work, but it's the only way to be safe. Once all
* the backrefs agree we may not need to do anything to the extent
* record itself.
*/
ret = -EAGAIN;
out:
while (!list_empty(&entries)) {
entry = list_entry(entries.next, struct extent_entry, list);
list_del_init(&entry->list);
free(entry);
}
return ret;
}
static int process_duplicates(struct btrfs_root *root,
struct cache_tree *extent_cache,
struct extent_record *rec)
{
struct extent_record *good, *tmp;
struct cache_extent *cache;
int ret;
/*
* If we found a extent record for this extent then return, or if we
* have more than one duplicate we are likely going to need to delete
* something.
*/
if (rec->found_rec || rec->num_duplicates > 1)
return 0;
/* Shouldn't happen but just in case */
BUG_ON(!rec->num_duplicates);
/*
* So this happens if we end up with a backref that doesn't match the
* actual extent entry. So either the backref is bad or the extent
* entry is bad. Either way we want to have the extent_record actually
* reflect what we found in the extent_tree, so we need to take the
* duplicate out and use that as the extent_record since the only way we
* get a duplicate is if we find a real life BTRFS_EXTENT_ITEM_KEY.
*/
remove_cache_extent(extent_cache, &rec->cache);
good = list_entry(rec->dups.next, struct extent_record, list);
list_del_init(&good->list);
INIT_LIST_HEAD(&good->backrefs);
INIT_LIST_HEAD(&good->dups);
good->cache.start = good->start;
good->cache.size = good->nr;
good->content_checked = 0;
good->owner_ref_checked = 0;
good->num_duplicates = 0;
good->refs = rec->refs;
list_splice_init(&rec->backrefs, &good->backrefs);
while (1) {
cache = lookup_cache_extent(extent_cache, good->start,
good->nr);
if (!cache)
break;
tmp = container_of(cache, struct extent_record, cache);
/*
* If we find another overlapping extent and it's found_rec is
* set then it's a duplicate and we need to try and delete
* something.
*/
if (tmp->found_rec || tmp->num_duplicates > 0) {
if (list_empty(&good->list))
list_add_tail(&good->list,
&duplicate_extents);
good->num_duplicates += tmp->num_duplicates + 1;
list_splice_init(&tmp->dups, &good->dups);
list_del_init(&tmp->list);
list_add_tail(&tmp->list, &good->dups);
remove_cache_extent(extent_cache, &tmp->cache);
continue;
}
/*
* Ok we have another non extent item backed extent rec, so lets
* just add it to this extent and carry on like we did above.
*/
good->refs += tmp->refs;
list_splice_init(&tmp->backrefs, &good->backrefs);
remove_cache_extent(extent_cache, &tmp->cache);
free(tmp);
}
ret = insert_cache_extent(extent_cache, &good->cache);
BUG_ON(ret);
free(rec);
return good->num_duplicates ? 0 : 1;
}
static int delete_duplicate_records(struct btrfs_root *root,
struct extent_record *rec)
{
struct btrfs_trans_handle *trans;
LIST_HEAD(delete_list);
struct btrfs_path *path;
struct extent_record *tmp, *good, *n;
int nr_del = 0;
int ret = 0, err;
struct btrfs_key key;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
good = rec;
/* Find the record that covers all of the duplicates. */
list_for_each_entry(tmp, &rec->dups, list) {
if (good->start < tmp->start)
continue;
if (good->nr > tmp->nr)
continue;
if (tmp->start + tmp->nr < good->start + good->nr) {
fprintf(stderr, "Ok we have overlapping extents that "
"aren't completely covered by eachother, this "
"is going to require more careful thought. "
"The extents are [%Lu-%Lu] and [%Lu-%Lu]\n",
tmp->start, tmp->nr, good->start, good->nr);
abort();
}
good = tmp;
}
if (good != rec)
list_add_tail(&rec->list, &delete_list);
list_for_each_entry_safe(tmp, n, &rec->dups, list) {
if (tmp == good)
continue;
list_move_tail(&tmp->list, &delete_list);
}
root = root->fs_info->extent_root;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
list_for_each_entry(tmp, &delete_list, list) {
if (tmp->found_rec == 0)
continue;
key.objectid = tmp->start;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = tmp->nr;
/* Shouldn't happen but just in case */
if (tmp->metadata) {
fprintf(stderr, "Well this shouldn't happen, extent "
"record overlaps but is metadata? "
"[%Lu, %Lu]\n", tmp->start, tmp->nr);
abort();
}
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret) {
if (ret > 0)
ret = -EINVAL;
break;
}
ret = btrfs_del_item(trans, root, path);
if (ret)
break;
btrfs_release_path(path);
nr_del++;
}
err = btrfs_commit_transaction(trans, root);
if (err && !ret)
ret = err;
out:
while (!list_empty(&delete_list)) {
tmp = list_entry(delete_list.next, struct extent_record, list);
list_del_init(&tmp->list);
if (tmp == rec)
continue;
free(tmp);
}
while (!list_empty(&rec->dups)) {
tmp = list_entry(rec->dups.next, struct extent_record, list);
list_del_init(&tmp->list);
free(tmp);
}
btrfs_free_path(path);
if (!ret && !nr_del)
rec->num_duplicates = 0;
return ret ? ret : nr_del;
}
static int find_possible_backrefs(struct btrfs_fs_info *info,
struct btrfs_path *path,
struct cache_tree *extent_cache,
struct extent_record *rec)
{
struct btrfs_root *root;
struct extent_backref *back;
struct data_backref *dback;
struct cache_extent *cache;
struct btrfs_file_extent_item *fi;
struct btrfs_key key;
u64 bytenr, bytes;
int ret;
list_for_each_entry(back, &rec->backrefs, list) {
/* Don't care about full backrefs (poor unloved backrefs) */
if (back->full_backref || !back->is_data)
continue;
dback = (struct data_backref *)back;
/* We found this one, we don't need to do a lookup */
if (dback->found_ref)
continue;
key.objectid = dback->root;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root(info, &key);
/* No root, definitely a bad ref, skip */
if (IS_ERR(root) && PTR_ERR(root) == -ENOENT)
continue;
/* Other err, exit */
if (IS_ERR(root))
return PTR_ERR(root);
key.objectid = dback->owner;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = dback->offset;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret) {
btrfs_release_path(path);
if (ret < 0)
return ret;
/* Didn't find it, we can carry on */
ret = 0;
continue;
}
fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_file_extent_item);
bytenr = btrfs_file_extent_disk_bytenr(path->nodes[0], fi);
bytes = btrfs_file_extent_disk_num_bytes(path->nodes[0], fi);
btrfs_release_path(path);
cache = lookup_cache_extent(extent_cache, bytenr, 1);
if (cache) {
struct extent_record *tmp;
tmp = container_of(cache, struct extent_record, cache);
/*
* If we found an extent record for the bytenr for this
* particular backref then we can't add it to our
* current extent record. We only want to add backrefs
* that don't have a corresponding extent item in the
* extent tree since they likely belong to this record
* and we need to fix it if it doesn't match bytenrs.
*/
if (tmp->found_rec)
continue;
}
dback->found_ref += 1;
dback->disk_bytenr = bytenr;
dback->bytes = bytes;
/*
* Set this so the verify backref code knows not to trust the
* values in this backref.
*/
back->broken = 1;
}
return 0;
}
/*
* Record orphan data ref into corresponding root.
*
* Return 0 if the extent item contains data ref and recorded.
* Return 1 if the extent item contains no useful data ref
* On that case, it may contains only shared_dataref or metadata backref
* or the file extent exists(this should be handled by the extent bytenr
* recovery routine)
* Return <0 if something goes wrong.
*/
static int record_orphan_data_extents(struct btrfs_fs_info *fs_info,
struct extent_record *rec)
{
struct btrfs_key key;
struct btrfs_root *dest_root;
struct extent_backref *back;
struct data_backref *dback;
struct orphan_data_extent *orphan;
struct btrfs_path *path;
int recorded_data_ref = 0;
int ret = 0;
if (rec->metadata)
return 1;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
list_for_each_entry(back, &rec->backrefs, list) {
if (back->full_backref || !back->is_data ||
!back->found_extent_tree)
continue;
dback = (struct data_backref *)back;
if (dback->found_ref)
continue;
key.objectid = dback->root;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
dest_root = btrfs_read_fs_root(fs_info, &key);
/* For non-exist root we just skip it */
if (IS_ERR(dest_root) || !dest_root)
continue;
key.objectid = dback->owner;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = dback->offset;
ret = btrfs_search_slot(NULL, dest_root, &key, path, 0, 0);
/*
* For ret < 0, it's OK since the fs-tree may be corrupted,
* we need to record it for inode/file extent rebuild.
* For ret > 0, we record it only for file extent rebuild.
* For ret == 0, the file extent exists but only bytenr
* mismatch, let the original bytenr fix routine to handle,
* don't record it.
*/
if (ret == 0)
continue;
ret = 0;
orphan = malloc(sizeof(*orphan));
if (!orphan) {
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&orphan->list);
orphan->root = dback->root;
orphan->objectid = dback->owner;
orphan->offset = dback->offset;
orphan->disk_bytenr = rec->cache.start;
orphan->disk_len = rec->cache.size;
list_add(&dest_root->orphan_data_extents, &orphan->list);
recorded_data_ref = 1;
}
out:
btrfs_free_path(path);
if (!ret)
return !recorded_data_ref;
else
return ret;
}
/*
* when an incorrect extent item is found, this will delete
* all of the existing entries for it and recreate them
* based on what the tree scan found.
*/
static int fixup_extent_refs(struct btrfs_fs_info *info,
struct cache_tree *extent_cache,
struct extent_record *rec)
{
struct btrfs_trans_handle *trans = NULL;
int ret;
struct btrfs_path *path;
struct list_head *cur = rec->backrefs.next;
struct cache_extent *cache;
struct extent_backref *back;
int allocated = 0;
u64 flags = 0;
if (rec->flag_block_full_backref)
flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
if (rec->refs != rec->extent_item_refs && !rec->metadata) {
/*
* Sometimes the backrefs themselves are so broken they don't
* get attached to any meaningful rec, so first go back and
* check any of our backrefs that we couldn't find and throw
* them into the list if we find the backref so that
* verify_backrefs can figure out what to do.
*/
ret = find_possible_backrefs(info, path, extent_cache, rec);
if (ret < 0)
goto out;
}
/* step one, make sure all of the backrefs agree */
ret = verify_backrefs(info, path, rec);
if (ret < 0)
goto out;
trans = btrfs_start_transaction(info->extent_root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
/* step two, delete all the existing records */
ret = delete_extent_records(trans, info->extent_root, path,
rec->start, rec->max_size);
if (ret < 0)
goto out;
/* was this block corrupt? If so, don't add references to it */
cache = lookup_cache_extent(info->corrupt_blocks,
rec->start, rec->max_size);
if (cache) {
ret = 0;
goto out;
}
/* step three, recreate all the refs we did find */
while(cur != &rec->backrefs) {
back = list_entry(cur, struct extent_backref, list);
cur = cur->next;
/*
* if we didn't find any references, don't create a
* new extent record
*/
if (!back->found_ref)
continue;
rec->bad_full_backref = 0;
ret = record_extent(trans, info, path, rec, back, allocated, flags);
allocated = 1;
if (ret)
goto out;
}
out:
if (trans) {
int err = btrfs_commit_transaction(trans, info->extent_root);
if (!ret)
ret = err;
}
btrfs_free_path(path);
return ret;
}
static int fixup_extent_flags(struct btrfs_fs_info *fs_info,
struct extent_record *rec)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_path *path;
struct btrfs_extent_item *ei;
struct btrfs_key key;
u64 flags;
int ret = 0;
key.objectid = rec->start;
if (rec->metadata) {
key.type = BTRFS_METADATA_ITEM_KEY;
key.offset = rec->info_level;
} else {
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = rec->max_size;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
btrfs_free_path(path);
return PTR_ERR(trans);
}
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
btrfs_free_path(path);
btrfs_commit_transaction(trans, root);
return ret;
} else if (ret) {
fprintf(stderr, "Didn't find extent for %llu\n",
(unsigned long long)rec->start);
btrfs_free_path(path);
btrfs_commit_transaction(trans, root);
return -ENOENT;
}
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_item);
flags = btrfs_extent_flags(path->nodes[0], ei);
if (rec->flag_block_full_backref) {
fprintf(stderr, "setting full backref on %llu\n",
(unsigned long long)key.objectid);
flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
} else {
fprintf(stderr, "clearing full backref on %llu\n",
(unsigned long long)key.objectid);
flags &= ~BTRFS_BLOCK_FLAG_FULL_BACKREF;
}
btrfs_set_extent_flags(path->nodes[0], ei, flags);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
return btrfs_commit_transaction(trans, root);
}
/* right now we only prune from the extent allocation tree */
static int prune_one_block(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *info,
struct btrfs_corrupt_block *corrupt)
{
int ret;
struct btrfs_path path;
struct extent_buffer *eb;
u64 found;
int slot;
int nritems;
int level = corrupt->level + 1;
btrfs_init_path(&path);
again:
/* we want to stop at the parent to our busted block */
path.lowest_level = level;
ret = btrfs_search_slot(trans, info->extent_root,
&corrupt->key, &path, -1, 1);
if (ret < 0)
goto out;
eb = path.nodes[level];
if (!eb) {
ret = -ENOENT;
goto out;
}
/*
* hopefully the search gave us the block we want to prune,
* lets try that first
*/
slot = path.slots[level];
found = btrfs_node_blockptr(eb, slot);
if (found == corrupt->cache.start)
goto del_ptr;
nritems = btrfs_header_nritems(eb);
/* the search failed, lets scan this node and hope we find it */
for (slot = 0; slot < nritems; slot++) {
found = btrfs_node_blockptr(eb, slot);
if (found == corrupt->cache.start)
goto del_ptr;
}
/*
* we couldn't find the bad block. TODO, search all the nodes for pointers
* to this block
*/
if (eb == info->extent_root->node) {
ret = -ENOENT;
goto out;
} else {
level++;
btrfs_release_path(&path);
goto again;
}
del_ptr:
printk("deleting pointer to block %Lu\n", corrupt->cache.start);
ret = btrfs_del_ptr(trans, info->extent_root, &path, level, slot);
out:
btrfs_release_path(&path);
return ret;
}
static int prune_corrupt_blocks(struct btrfs_fs_info *info)
{
struct btrfs_trans_handle *trans = NULL;
struct cache_extent *cache;
struct btrfs_corrupt_block *corrupt;
while (1) {
cache = search_cache_extent(info->corrupt_blocks, 0);
if (!cache)
break;
if (!trans) {
trans = btrfs_start_transaction(info->extent_root, 1);
if (IS_ERR(trans))
return PTR_ERR(trans);
}
corrupt = container_of(cache, struct btrfs_corrupt_block, cache);
prune_one_block(trans, info, corrupt);
remove_cache_extent(info->corrupt_blocks, cache);
}
if (trans)
return btrfs_commit_transaction(trans, info->extent_root);
return 0;
}
static void reset_cached_block_groups(struct btrfs_fs_info *fs_info)
{
struct btrfs_block_group_cache *cache;
u64 start, end;
int ret;
while (1) {
ret = find_first_extent_bit(&fs_info->free_space_cache, 0,
&start, &end, EXTENT_DIRTY);
if (ret)
break;
clear_extent_dirty(&fs_info->free_space_cache, start, end,
GFP_NOFS);
}
start = 0;
while (1) {
cache = btrfs_lookup_first_block_group(fs_info, start);
if (!cache)
break;
if (cache->cached)
cache->cached = 0;
start = cache->key.objectid + cache->key.offset;
}
}
static int check_extent_refs(struct btrfs_root *root,
struct cache_tree *extent_cache)
{
struct extent_record *rec;
struct cache_extent *cache;
int err = 0;
int ret = 0;
int fixed = 0;
int had_dups = 0;
int recorded = 0;
if (repair) {
/*
* if we're doing a repair, we have to make sure
* we don't allocate from the problem extents.
* In the worst case, this will be all the
* extents in the FS
*/
cache = search_cache_extent(extent_cache, 0);
while(cache) {
rec = container_of(cache, struct extent_record, cache);
set_extent_dirty(root->fs_info->excluded_extents,
rec->start,
rec->start + rec->max_size - 1,
GFP_NOFS);
cache = next_cache_extent(cache);
}
/* pin down all the corrupted blocks too */
cache = search_cache_extent(root->fs_info->corrupt_blocks, 0);
while(cache) {
set_extent_dirty(root->fs_info->excluded_extents,
cache->start,
cache->start + cache->size - 1,
GFP_NOFS);
cache = next_cache_extent(cache);
}
prune_corrupt_blocks(root->fs_info);
reset_cached_block_groups(root->fs_info);
}
reset_cached_block_groups(root->fs_info);
/*
* We need to delete any duplicate entries we find first otherwise we
* could mess up the extent tree when we have backrefs that actually
* belong to a different extent item and not the weird duplicate one.
*/
while (repair && !list_empty(&duplicate_extents)) {
rec = list_entry(duplicate_extents.next, struct extent_record,
list);
list_del_init(&rec->list);
/* Sometimes we can find a backref before we find an actual
* extent, so we need to process it a little bit to see if there
* truly are multiple EXTENT_ITEM_KEY's for the same range, or
* if this is a backref screwup. If we need to delete stuff
* process_duplicates() will return 0, otherwise it will return
* 1 and we
*/
if (process_duplicates(root, extent_cache, rec))
continue;
ret = delete_duplicate_records(root, rec);
if (ret < 0)
return ret;
/*
* delete_duplicate_records will return the number of entries
* deleted, so if it's greater than 0 then we know we actually
* did something and we need to remove.
*/
if (ret)
had_dups = 1;
}
if (had_dups)
return -EAGAIN;
while(1) {
int cur_err = 0;
fixed = 0;
recorded = 0;
cache = search_cache_extent(extent_cache, 0);
if (!cache)
break;
rec = container_of(cache, struct extent_record, cache);
if (rec->num_duplicates) {
fprintf(stderr, "extent item %llu has multiple extent "
"items\n", (unsigned long long)rec->start);
err = 1;
cur_err = 1;
}
if (rec->refs != rec->extent_item_refs) {
fprintf(stderr, "ref mismatch on [%llu %llu] ",
(unsigned long long)rec->start,
(unsigned long long)rec->nr);
fprintf(stderr, "extent item %llu, found %llu\n",
(unsigned long long)rec->extent_item_refs,
(unsigned long long)rec->refs);
ret = record_orphan_data_extents(root->fs_info, rec);
if (ret < 0)
goto repair_abort;
if (ret == 0) {
recorded = 1;
} else {
/*
* we can't use the extent to repair file
* extent, let the fallback method handle it.
*/
if (!fixed && repair) {
ret = fixup_extent_refs(
root->fs_info,
extent_cache, rec);
if (ret)
goto repair_abort;
fixed = 1;
}
}
err = 1;
cur_err = 1;
}
if (all_backpointers_checked(rec, 1)) {
fprintf(stderr, "backpointer mismatch on [%llu %llu]\n",
(unsigned long long)rec->start,
(unsigned long long)rec->nr);
if (!fixed && !recorded && repair) {
ret = fixup_extent_refs(root->fs_info,
extent_cache, rec);
if (ret)
goto repair_abort;
fixed = 1;
}
cur_err = 1;
err = 1;
}
if (!rec->owner_ref_checked) {
fprintf(stderr, "owner ref check failed [%llu %llu]\n",
(unsigned long long)rec->start,
(unsigned long long)rec->nr);
if (!fixed && !recorded && repair) {
ret = fixup_extent_refs(root->fs_info,
extent_cache, rec);
if (ret)
goto repair_abort;
fixed = 1;
}
err = 1;
cur_err = 1;
}
if (rec->bad_full_backref) {
fprintf(stderr, "bad full backref, on [%llu]\n",
(unsigned long long)rec->start);
if (repair) {
ret = fixup_extent_flags(root->fs_info, rec);
if (ret)
goto repair_abort;
fixed = 1;
}
err = 1;
cur_err = 1;
}
remove_cache_extent(extent_cache, cache);
free_all_extent_backrefs(rec);
if (!init_extent_tree && repair && (!cur_err || fixed))
clear_extent_dirty(root->fs_info->excluded_extents,
rec->start,
rec->start + rec->max_size - 1,
GFP_NOFS);
free(rec);
}
repair_abort:
if (repair) {
if (ret && ret != -EAGAIN) {
fprintf(stderr, "failed to repair damaged filesystem, aborting\n");
exit(1);
} else if (!ret) {
struct btrfs_trans_handle *trans;
root = root->fs_info->extent_root;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto repair_abort;
}
btrfs_fix_block_accounting(trans, root);
ret = btrfs_commit_transaction(trans, root);
if (ret)
goto repair_abort;
}
if (err)
fprintf(stderr, "repaired damaged extent references\n");
return ret;
}
return err;
}
u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
{
u64 stripe_size;
if (type & BTRFS_BLOCK_GROUP_RAID0) {
stripe_size = length;
stripe_size /= num_stripes;
} else if (type & BTRFS_BLOCK_GROUP_RAID10) {
stripe_size = length * 2;
stripe_size /= num_stripes;
} else if (type & BTRFS_BLOCK_GROUP_RAID5) {
stripe_size = length;
stripe_size /= (num_stripes - 1);
} else if (type & BTRFS_BLOCK_GROUP_RAID6) {
stripe_size = length;
stripe_size /= (num_stripes - 2);
} else {
stripe_size = length;
}
return stripe_size;
}
/*
* Check the chunk with its block group/dev list ref:
* Return 0 if all refs seems valid.
* Return 1 if part of refs seems valid, need later check for rebuild ref
* like missing block group and needs to search extent tree to rebuild them.
* Return -1 if essential refs are missing and unable to rebuild.
*/
static int check_chunk_refs(struct chunk_record *chunk_rec,
struct block_group_tree *block_group_cache,
struct device_extent_tree *dev_extent_cache,
int silent)
{
struct cache_extent *block_group_item;
struct block_group_record *block_group_rec;
struct cache_extent *dev_extent_item;
struct device_extent_record *dev_extent_rec;
u64 devid;
u64 offset;
u64 length;
int metadump_v2 = 0;
int i;
int ret = 0;
block_group_item = lookup_cache_extent(&block_group_cache->tree,
chunk_rec->offset,
chunk_rec->length);
if (block_group_item) {
block_group_rec = container_of(block_group_item,
struct block_group_record,
cache);
if (chunk_rec->length != block_group_rec->offset ||
chunk_rec->offset != block_group_rec->objectid ||
(!metadump_v2 &&
chunk_rec->type_flags != block_group_rec->flags)) {
if (!silent)
fprintf(stderr,
"Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) mismatch with block group[%llu, %u, %llu]: offset(%llu), objectid(%llu), flags(%llu)\n",
chunk_rec->objectid,
chunk_rec->type,
chunk_rec->offset,
chunk_rec->length,
chunk_rec->offset,
chunk_rec->type_flags,
block_group_rec->objectid,
block_group_rec->type,
block_group_rec->offset,
block_group_rec->offset,
block_group_rec->objectid,
block_group_rec->flags);
ret = -1;
} else {
list_del_init(&block_group_rec->list);
chunk_rec->bg_rec = block_group_rec;
}
} else {
if (!silent)
fprintf(stderr,
"Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) is not found in block group\n",
chunk_rec->objectid,
chunk_rec->type,
chunk_rec->offset,
chunk_rec->length,
chunk_rec->offset,
chunk_rec->type_flags);
ret = 1;
}
if (metadump_v2)
return ret;
length = calc_stripe_length(chunk_rec->type_flags, chunk_rec->length,
chunk_rec->num_stripes);
for (i = 0; i < chunk_rec->num_stripes; ++i) {
devid = chunk_rec->stripes[i].devid;
offset = chunk_rec->stripes[i].offset;
dev_extent_item = lookup_cache_extent2(&dev_extent_cache->tree,
devid, offset, length);
if (dev_extent_item) {
dev_extent_rec = container_of(dev_extent_item,
struct device_extent_record,
cache);
if (dev_extent_rec->objectid != devid ||
dev_extent_rec->offset != offset ||
dev_extent_rec->chunk_offset != chunk_rec->offset ||
dev_extent_rec->length != length) {
if (!silent)
fprintf(stderr,
"Chunk[%llu, %u, %llu] stripe[%llu, %llu] dismatch dev extent[%llu, %llu, %llu]\n",
chunk_rec->objectid,
chunk_rec->type,
chunk_rec->offset,
chunk_rec->stripes[i].devid,
chunk_rec->stripes[i].offset,
dev_extent_rec->objectid,
dev_extent_rec->offset,
dev_extent_rec->length);
ret = -1;
} else {
list_move(&dev_extent_rec->chunk_list,
&chunk_rec->dextents);
}
} else {
if (!silent)
fprintf(stderr,
"Chunk[%llu, %u, %llu] stripe[%llu, %llu] is not found in dev extent\n",
chunk_rec->objectid,
chunk_rec->type,
chunk_rec->offset,
chunk_rec->stripes[i].devid,
chunk_rec->stripes[i].offset);
ret = -1;
}
}
return ret;
}
/* check btrfs_chunk -> btrfs_dev_extent / btrfs_block_group_item */
int check_chunks(struct cache_tree *chunk_cache,
struct block_group_tree *block_group_cache,
struct device_extent_tree *dev_extent_cache,
struct list_head *good, struct list_head *bad,
struct list_head *rebuild, int silent)
{
struct cache_extent *chunk_item;
struct chunk_record *chunk_rec;
struct block_group_record *bg_rec;
struct device_extent_record *dext_rec;
int err;
int ret = 0;
chunk_item = first_cache_extent(chunk_cache);
while (chunk_item) {
chunk_rec = container_of(chunk_item, struct chunk_record,
cache);
err = check_chunk_refs(chunk_rec, block_group_cache,
dev_extent_cache, silent);
if (err < 0)
ret = err;
if (err == 0 && good)
list_add_tail(&chunk_rec->list, good);
if (err > 0 && rebuild)
list_add_tail(&chunk_rec->list, rebuild);
if (err < 0 && bad)
list_add_tail(&chunk_rec->list, bad);
chunk_item = next_cache_extent(chunk_item);
}
list_for_each_entry(bg_rec, &block_group_cache->block_groups, list) {
if (!silent)
fprintf(stderr,
"Block group[%llu, %llu] (flags = %llu) didn't find the relative chunk.\n",
bg_rec->objectid,
bg_rec->offset,
bg_rec->flags);
if (!ret)
ret = 1;
}
list_for_each_entry(dext_rec, &dev_extent_cache->no_chunk_orphans,
chunk_list) {
if (!silent)
fprintf(stderr,
"Device extent[%llu, %llu, %llu] didn't find the relative chunk.\n",
dext_rec->objectid,
dext_rec->offset,
dext_rec->length);
if (!ret)
ret = 1;
}
return ret;
}
static int check_device_used(struct device_record *dev_rec,
struct device_extent_tree *dext_cache)
{
struct cache_extent *cache;
struct device_extent_record *dev_extent_rec;
u64 total_byte = 0;
cache = search_cache_extent2(&dext_cache->tree, dev_rec->devid, 0);
while (cache) {
dev_extent_rec = container_of(cache,
struct device_extent_record,
cache);
if (dev_extent_rec->objectid != dev_rec->devid)
break;
list_del_init(&dev_extent_rec->device_list);
total_byte += dev_extent_rec->length;
cache = next_cache_extent(cache);
}
if (total_byte != dev_rec->byte_used) {
fprintf(stderr,
"Dev extent's total-byte(%llu) is not equal to byte-used(%llu) in dev[%llu, %u, %llu]\n",
total_byte, dev_rec->byte_used, dev_rec->objectid,
dev_rec->type, dev_rec->offset);
return -1;
} else {
return 0;
}
}
/* check btrfs_dev_item -> btrfs_dev_extent */
static int check_devices(struct rb_root *dev_cache,
struct device_extent_tree *dev_extent_cache)
{
struct rb_node *dev_node;
struct device_record *dev_rec;
struct device_extent_record *dext_rec;
int err;
int ret = 0;
dev_node = rb_first(dev_cache);
while (dev_node) {
dev_rec = container_of(dev_node, struct device_record, node);
err = check_device_used(dev_rec, dev_extent_cache);
if (err)
ret = err;
dev_node = rb_next(dev_node);
}
list_for_each_entry(dext_rec, &dev_extent_cache->no_device_orphans,
device_list) {
fprintf(stderr,
"Device extent[%llu, %llu, %llu] didn't find its device.\n",
dext_rec->objectid, dext_rec->offset, dext_rec->length);
if (!ret)
ret = 1;
}
return ret;
}
static int add_root_item_to_list(struct list_head *head,
u64 objectid, u64 bytenr, u64 last_snapshot,
u8 level, u8 drop_level,
int level_size, struct btrfs_key *drop_key)
{
struct root_item_record *ri_rec;
ri_rec = malloc(sizeof(*ri_rec));
if (!ri_rec)
return -ENOMEM;
ri_rec->bytenr = bytenr;
ri_rec->objectid = objectid;
ri_rec->level = level;
ri_rec->level_size = level_size;
ri_rec->drop_level = drop_level;
ri_rec->last_snapshot = last_snapshot;
if (drop_key)
memcpy(&ri_rec->drop_key, drop_key, sizeof(*drop_key));
list_add_tail(&ri_rec->list, head);
return 0;
}
static void free_root_item_list(struct list_head *list)
{
struct root_item_record *ri_rec;
while (!list_empty(list)) {
ri_rec = list_first_entry(list, struct root_item_record,
list);
list_del_init(&ri_rec->list);
free(ri_rec);
}
}
static int deal_root_from_list(struct list_head *list,
struct btrfs_root *root,
struct block_info *bits,
int bits_nr,
struct cache_tree *pending,
struct cache_tree *seen,
struct cache_tree *reada,
struct cache_tree *nodes,
struct cache_tree *extent_cache,
struct cache_tree *chunk_cache,
struct rb_root *dev_cache,
struct block_group_tree *block_group_cache,
struct device_extent_tree *dev_extent_cache)
{
int ret = 0;
u64 last;
while (!list_empty(list)) {
struct root_item_record *rec;
struct extent_buffer *buf;
rec = list_entry(list->next,
struct root_item_record, list);
last = 0;
buf = read_tree_block(root->fs_info->tree_root,
rec->bytenr, rec->level_size, 0);
if (!extent_buffer_uptodate(buf)) {
free_extent_buffer(buf);
ret = -EIO;
break;
}
add_root_to_pending(buf, extent_cache, pending,
seen, nodes, rec->objectid);
/*
* To rebuild extent tree, we need deal with snapshot
* one by one, otherwise we deal with node firstly which
* can maximize readahead.
*/
while (1) {
ret = run_next_block(root, bits, bits_nr, &last,
pending, seen, reada, nodes,
extent_cache, chunk_cache,
dev_cache, block_group_cache,
dev_extent_cache, rec);
if (ret != 0)
break;
}
free_extent_buffer(buf);
list_del(&rec->list);
free(rec);
if (ret < 0)
break;
}
while (ret >= 0) {
ret = run_next_block(root, bits, bits_nr, &last, pending, seen,
reada, nodes, extent_cache, chunk_cache,
dev_cache, block_group_cache,
dev_extent_cache, NULL);
if (ret != 0) {
if (ret > 0)
ret = 0;
break;
}
}
return ret;
}
static int check_chunks_and_extents(struct btrfs_root *root)
{
struct rb_root dev_cache;
struct cache_tree chunk_cache;
struct block_group_tree block_group_cache;
struct device_extent_tree dev_extent_cache;
struct cache_tree extent_cache;
struct cache_tree seen;
struct cache_tree pending;
struct cache_tree reada;
struct cache_tree nodes;
struct extent_io_tree excluded_extents;
struct cache_tree corrupt_blocks;
struct btrfs_path path;
struct btrfs_key key;
struct btrfs_key found_key;
int ret, err = 0;
struct block_info *bits;
int bits_nr;
struct extent_buffer *leaf;
int slot;
struct btrfs_root_item ri;
struct list_head dropping_trees;
struct list_head normal_trees;
struct btrfs_root *root1;
u64 objectid;
u32 level_size;
u8 level;
dev_cache = RB_ROOT;
cache_tree_init(&chunk_cache);
block_group_tree_init(&block_group_cache);
device_extent_tree_init(&dev_extent_cache);
cache_tree_init(&extent_cache);
cache_tree_init(&seen);
cache_tree_init(&pending);
cache_tree_init(&nodes);
cache_tree_init(&reada);
cache_tree_init(&corrupt_blocks);
extent_io_tree_init(&excluded_extents);
INIT_LIST_HEAD(&dropping_trees);
INIT_LIST_HEAD(&normal_trees);
if (repair) {
root->fs_info->excluded_extents = &excluded_extents;
root->fs_info->fsck_extent_cache = &extent_cache;
root->fs_info->free_extent_hook = free_extent_hook;
root->fs_info->corrupt_blocks = &corrupt_blocks;
}
bits_nr = 1024;
bits = malloc(bits_nr * sizeof(struct block_info));
if (!bits) {
perror("malloc");
exit(1);
}
again:
root1 = root->fs_info->tree_root;
level = btrfs_header_level(root1->node);
ret = add_root_item_to_list(&normal_trees, root1->root_key.objectid,
root1->node->start, 0, level, 0,
btrfs_level_size(root1, level), NULL);
if (ret < 0)
goto out;
root1 = root->fs_info->chunk_root;
level = btrfs_header_level(root1->node);
ret = add_root_item_to_list(&normal_trees, root1->root_key.objectid,
root1->node->start, 0, level, 0,
btrfs_level_size(root1, level), NULL);
if (ret < 0)
goto out;
btrfs_init_path(&path);
key.offset = 0;
key.objectid = 0;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
&key, &path, 0, 0);
if (ret < 0)
goto out;
while(1) {
leaf = path.nodes[0];
slot = path.slots[0];
if (slot >= btrfs_header_nritems(path.nodes[0])) {
ret = btrfs_next_leaf(root, &path);
if (ret != 0)
break;
leaf = path.nodes[0];
slot = path.slots[0];
}
btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
unsigned long offset;
u64 last_snapshot;
offset = btrfs_item_ptr_offset(leaf, path.slots[0]);
read_extent_buffer(leaf, &ri, offset, sizeof(ri));
last_snapshot = btrfs_root_last_snapshot(&ri);
if (btrfs_disk_key_objectid(&ri.drop_progress) == 0) {
level = btrfs_root_level(&ri);
level_size = btrfs_level_size(root, level);
ret = add_root_item_to_list(&normal_trees,
found_key.objectid,
btrfs_root_bytenr(&ri),
last_snapshot, level,
0, level_size, NULL);
if (ret < 0)
goto out;
} else {
level = btrfs_root_level(&ri);
level_size = btrfs_level_size(root, level);
objectid = found_key.objectid;
btrfs_disk_key_to_cpu(&found_key,
&ri.drop_progress);
ret = add_root_item_to_list(&dropping_trees,
objectid,
btrfs_root_bytenr(&ri),
last_snapshot, level,
ri.drop_level,
level_size, &found_key);
if (ret < 0)
goto out;
}
}
path.slots[0]++;
}
btrfs_release_path(&path);
/*
* check_block can return -EAGAIN if it fixes something, please keep
* this in mind when dealing with return values from these functions, if
* we get -EAGAIN we want to fall through and restart the loop.
*/
ret = deal_root_from_list(&normal_trees, root, bits, bits_nr, &pending,
&seen, &reada, &nodes, &extent_cache,
&chunk_cache, &dev_cache, &block_group_cache,
&dev_extent_cache);
if (ret < 0) {
if (ret == -EAGAIN)
goto loop;
goto out;
}
ret = deal_root_from_list(&dropping_trees, root, bits, bits_nr,
&pending, &seen, &reada, &nodes,
&extent_cache, &chunk_cache, &dev_cache,
&block_group_cache, &dev_extent_cache);
if (ret < 0) {
if (ret == -EAGAIN)
goto loop;
goto out;
}
err = check_chunks(&chunk_cache, &block_group_cache,
&dev_extent_cache, NULL, NULL, NULL, 0);
if (err) {
if (err == -EAGAIN)
goto loop;
if (!ret)
ret = err;
}
ret = check_extent_refs(root, &extent_cache);
if (ret < 0) {
if (ret == -EAGAIN)
goto loop;
goto out;
}
err = check_devices(&dev_cache, &dev_extent_cache);
if (err && !ret)
ret = err;
out:
if (repair) {
free_corrupt_blocks_tree(root->fs_info->corrupt_blocks);
extent_io_tree_cleanup(&excluded_extents);
root->fs_info->fsck_extent_cache = NULL;
root->fs_info->free_extent_hook = NULL;
root->fs_info->corrupt_blocks = NULL;
root->fs_info->excluded_extents = NULL;
}
free(bits);
free_chunk_cache_tree(&chunk_cache);
free_device_cache_tree(&dev_cache);
free_block_group_tree(&block_group_cache);
free_device_extent_tree(&dev_extent_cache);
free_extent_cache_tree(&seen);
free_extent_cache_tree(&pending);
free_extent_cache_tree(&reada);
free_extent_cache_tree(&nodes);
return ret;
loop:
free_corrupt_blocks_tree(root->fs_info->corrupt_blocks);
free_extent_cache_tree(&seen);
free_extent_cache_tree(&pending);
free_extent_cache_tree(&reada);
free_extent_cache_tree(&nodes);
free_chunk_cache_tree(&chunk_cache);
free_block_group_tree(&block_group_cache);
free_device_cache_tree(&dev_cache);
free_device_extent_tree(&dev_extent_cache);
free_extent_record_cache(root->fs_info, &extent_cache);
free_root_item_list(&normal_trees);
free_root_item_list(&dropping_trees);
extent_io_tree_cleanup(&excluded_extents);
goto again;
}
static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int overwrite)
{
struct extent_buffer *c;
struct extent_buffer *old = root->node;
int level;
int ret;
struct btrfs_disk_key disk_key = {0,0,0};
level = 0;
if (overwrite) {
c = old;
extent_buffer_get(c);
goto init;
}
c = btrfs_alloc_free_block(trans, root,
btrfs_level_size(root, 0),
root->root_key.objectid,
&disk_key, level, 0, 0);
if (IS_ERR(c)) {
c = old;
extent_buffer_get(c);
overwrite = 1;
}
init:
memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_level(c, level);
btrfs_set_header_bytenr(c, c->start);
btrfs_set_header_generation(c, trans->transid);
btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(c, root->root_key.objectid);
write_extent_buffer(c, root->fs_info->fsid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(c),
BTRFS_UUID_SIZE);
btrfs_mark_buffer_dirty(c);
/*
* this case can happen in the following case:
*
* 1.overwrite previous root.
*
* 2.reinit reloc data root, this is because we skip pin
* down reloc data tree before which means we can allocate
* same block bytenr here.
*/
if (old->start == c->start) {
btrfs_set_root_generation(&root->root_item,
trans->transid);
root->root_item.level = btrfs_header_level(root->node);
ret = btrfs_update_root(trans, root->fs_info->tree_root,
&root->root_key, &root->root_item);
if (ret) {
free_extent_buffer(c);
return ret;
}
}
free_extent_buffer(old);
root->node = c;
add_root_to_dirty_list(root);
return 0;
}
static int pin_down_tree_blocks(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb, int tree_root)
{
struct extent_buffer *tmp;
struct btrfs_root_item *ri;
struct btrfs_key key;
u64 bytenr;
u32 leafsize;
int level = btrfs_header_level(eb);
int nritems;
int ret;
int i;
/*
* If we have pinned this block before, don't pin it again.
* This can not only avoid forever loop with broken filesystem
* but also give us some speedups.
*/
if (test_range_bit(&fs_info->pinned_extents, eb->start,
eb->start + eb->len - 1, EXTENT_DIRTY, 0))
return 0;
btrfs_pin_extent(fs_info, eb->start, eb->len);
leafsize = btrfs_super_leafsize(fs_info->super_copy);
nritems = btrfs_header_nritems(eb);
for (i = 0; i < nritems; i++) {
if (level == 0) {
btrfs_item_key_to_cpu(eb, &key, i);
if (key.type != BTRFS_ROOT_ITEM_KEY)
continue;
/* Skip the extent root and reloc roots */
if (key.objectid == BTRFS_EXTENT_TREE_OBJECTID ||
key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
continue;
ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
bytenr = btrfs_disk_root_bytenr(eb, ri);
/*
* If at any point we start needing the real root we
* will have to build a stump root for the root we are
* in, but for now this doesn't actually use the root so
* just pass in extent_root.
*/
tmp = read_tree_block(fs_info->extent_root, bytenr,
leafsize, 0);
if (!extent_buffer_uptodate(tmp)) {
fprintf(stderr, "Error reading root block\n");
return -EIO;
}
ret = pin_down_tree_blocks(fs_info, tmp, 0);
free_extent_buffer(tmp);
if (ret)
return ret;
} else {
bytenr = btrfs_node_blockptr(eb, i);
/* If we aren't the tree root don't read the block */
if (level == 1 && !tree_root) {
btrfs_pin_extent(fs_info, bytenr, leafsize);
continue;
}
tmp = read_tree_block(fs_info->extent_root, bytenr,
leafsize, 0);
if (!extent_buffer_uptodate(tmp)) {
fprintf(stderr, "Error reading tree block\n");
return -EIO;
}
ret = pin_down_tree_blocks(fs_info, tmp, tree_root);
free_extent_buffer(tmp);
if (ret)
return ret;
}
}
return 0;
}
static int pin_metadata_blocks(struct btrfs_fs_info *fs_info)
{
int ret;
ret = pin_down_tree_blocks(fs_info, fs_info->chunk_root->node, 0);
if (ret)
return ret;
return pin_down_tree_blocks(fs_info, fs_info->tree_root->node, 1);
}
static int reset_block_groups(struct btrfs_fs_info *fs_info)
{
struct btrfs_block_group_cache *cache;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_chunk *chunk;
struct btrfs_key key;
int ret;
u64 start;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_CHUNK_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0);
if (ret < 0) {
btrfs_free_path(path);
return ret;
}
/*
* We do this in case the block groups were screwed up and had alloc
* bits that aren't actually set on the chunks. This happens with
* restored images every time and could happen in real life I guess.
*/
fs_info->avail_data_alloc_bits = 0;
fs_info->avail_metadata_alloc_bits = 0;
fs_info->avail_system_alloc_bits = 0;
/* First we need to create the in-memory block groups */
while (1) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(fs_info->chunk_root, path);
if (ret < 0) {
btrfs_free_path(path);
return ret;
}
if (ret) {
ret = 0;
break;
}
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.type != BTRFS_CHUNK_ITEM_KEY) {
path->slots[0]++;
continue;
}
chunk = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_chunk);
btrfs_add_block_group(fs_info, 0,
btrfs_chunk_type(leaf, chunk),
key.objectid, key.offset,
btrfs_chunk_length(leaf, chunk));
set_extent_dirty(&fs_info->free_space_cache, key.offset,
key.offset + btrfs_chunk_length(leaf, chunk),
GFP_NOFS);
path->slots[0]++;
}
start = 0;
while (1) {
cache = btrfs_lookup_first_block_group(fs_info, start);
if (!cache)
break;
cache->cached = 1;
start = cache->key.objectid + cache->key.offset;
}
btrfs_free_path(path);
return 0;
}
static int reset_balance(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
int del_slot, del_nr = 0;
int ret;
int found = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = BTRFS_BALANCE_OBJECTID;
key.type = BTRFS_BALANCE_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret) {
if (ret > 0)
ret = 0;
if (!ret)
goto reinit_data_reloc;
else
goto out;
}
ret = btrfs_del_item(trans, root, path);
if (ret)
goto out;
btrfs_release_path(path);
key.objectid = BTRFS_TREE_RELOC_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;
while (1) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
if (!found)
break;
if (del_nr) {
ret = btrfs_del_items(trans, root, path,
del_slot, del_nr);
del_nr = 0;
if (ret)
goto out;
}
key.offset++;
btrfs_release_path(path);
found = 0;
ret = btrfs_search_slot(trans, root, &key, path,
-1, 1);
if (ret < 0)
goto out;
continue;
}
found = 1;
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid > BTRFS_TREE_RELOC_OBJECTID)
break;
if (key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
path->slots[0]++;
continue;
}
if (!del_nr) {
del_slot = path->slots[0];
del_nr = 1;
} else {
del_nr++;
}
path->slots[0]++;
}
if (del_nr) {
ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
if (ret)
goto out;
}
btrfs_release_path(path);
reinit_data_reloc:
key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root(fs_info, &key);
if (IS_ERR(root)) {
fprintf(stderr, "Error reading data reloc tree\n");
ret = PTR_ERR(root);
goto out;
}
record_root_in_trans(trans, root);
ret = btrfs_fsck_reinit_root(trans, root, 0);
if (ret)
goto out;
ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
out:
btrfs_free_path(path);
return ret;
}
static int reinit_extent_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{
u64 start = 0;
int ret;
/*
* The only reason we don't do this is because right now we're just
* walking the trees we find and pinning down their bytes, we don't look
* at any of the leaves. In order to do mixed groups we'd have to check
* the leaves of any fs roots and pin down the bytes for any file
* extents we find. Not hard but why do it if we don't have to?
*/
if (btrfs_fs_incompat(fs_info, BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)) {
fprintf(stderr, "We don't support re-initing the extent tree "
"for mixed block groups yet, please notify a btrfs "
"developer you want to do this so they can add this "
"functionality.\n");
return -EINVAL;
}
/*
* first we need to walk all of the trees except the extent tree and pin
* down the bytes that are in use so we don't overwrite any existing
* metadata.
*/
ret = pin_metadata_blocks(fs_info);
if (ret) {
fprintf(stderr, "error pinning down used bytes\n");
return ret;
}
/*
* Need to drop all the block groups since we're going to recreate all
* of them again.
*/
btrfs_free_block_groups(fs_info);
ret = reset_block_groups(fs_info);
if (ret) {
fprintf(stderr, "error resetting the block groups\n");
return ret;
}
/* Ok we can allocate now, reinit the extent root */
ret = btrfs_fsck_reinit_root(trans, fs_info->extent_root, 0);
if (ret) {
fprintf(stderr, "extent root initialization failed\n");
/*
* When the transaction code is updated we should end the
* transaction, but for now progs only knows about commit so
* just return an error.
*/
return ret;
}
/*
* Now we have all the in-memory block groups setup so we can make
* allocations properly, and the metadata we care about is safe since we
* pinned all of it above.
*/
while (1) {
struct btrfs_block_group_cache *cache;
cache = btrfs_lookup_first_block_group(fs_info, start);
if (!cache)
break;
start = cache->key.objectid + cache->key.offset;
ret = btrfs_insert_item(trans, fs_info->extent_root,
&cache->key, &cache->item,
sizeof(cache->item));
if (ret) {
fprintf(stderr, "Error adding block group\n");
return ret;
}
btrfs_extent_post_op(trans, fs_info->extent_root);
}
ret = reset_balance(trans, fs_info);
if (ret)
fprintf(stderr, "error reseting the pending balance\n");
return ret;
}
static int recow_extent_buffer(struct btrfs_root *root, struct extent_buffer *eb)
{
struct btrfs_path *path;
struct btrfs_trans_handle *trans;
struct btrfs_key key;
int ret;
printf("Recowing metadata block %llu\n", eb->start);
key.objectid = btrfs_header_owner(eb);
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root(root->fs_info, &key);
if (IS_ERR(root)) {
fprintf(stderr, "Couldn't find owner root %llu\n",
key.objectid);
return PTR_ERR(root);
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
return PTR_ERR(trans);
}
path->lowest_level = btrfs_header_level(eb);
if (path->lowest_level)
btrfs_node_key_to_cpu(eb, &key, 0);
else
btrfs_item_key_to_cpu(eb, &key, 0);
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int delete_bad_item(struct btrfs_root *root, struct bad_item *bad)
{
struct btrfs_path *path;
struct btrfs_trans_handle *trans;
struct btrfs_key key;
int ret;
printf("Deleting bad item [%llu,%u,%llu]\n", bad->key.objectid,
bad->key.type, bad->key.offset);
key.objectid = bad->root_id;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root(root->fs_info, &key);
if (IS_ERR(root)) {
fprintf(stderr, "Couldn't find owner root %llu\n",
key.objectid);
return PTR_ERR(root);
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
return PTR_ERR(trans);
}
ret = btrfs_search_slot(trans, root, &bad->key, path, -1, 1);
if (ret) {
if (ret > 0)
ret = 0;
goto out;
}
ret = btrfs_del_item(trans, root, path);
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int zero_log_tree(struct btrfs_root *root)
{
struct btrfs_trans_handle *trans;
int ret;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
return ret;
}
btrfs_set_super_log_root(root->fs_info->super_copy, 0);
btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
ret = btrfs_commit_transaction(trans, root);
return ret;
}
static int populate_csum(struct btrfs_trans_handle *trans,
struct btrfs_root *csum_root, char *buf, u64 start,
u64 len)
{
u64 offset = 0;
u64 sectorsize;
int ret = 0;
while (offset < len) {
sectorsize = csum_root->sectorsize;
ret = read_extent_data(csum_root, buf, start + offset,
§orsize, 0);
if (ret)
break;
ret = btrfs_csum_file_block(trans, csum_root, start + len,
start + offset, buf, sectorsize);
if (ret)
break;
offset += sectorsize;
}
return ret;
}
static int fill_csum_tree_from_one_fs_root(struct btrfs_trans_handle *trans,
struct btrfs_root *csum_root,
struct btrfs_root *cur_root)
{
struct btrfs_path *path;
struct btrfs_key key;
struct extent_buffer *node;
struct btrfs_file_extent_item *fi;
char *buf = NULL;
u64 start = 0;
u64 len = 0;
int slot = 0;
int ret = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
buf = malloc(cur_root->fs_info->csum_root->sectorsize);
if (!buf) {
ret = -ENOMEM;
goto out;
}
key.objectid = 0;
key.offset = 0;
key.type = 0;
ret = btrfs_search_slot(NULL, cur_root, &key, path, 0, 0);
if (ret < 0)
goto out;
/* Iterate all regular file extents and fill its csum */
while (1) {
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_EXTENT_DATA_KEY)
goto next;
node = path->nodes[0];
slot = path->slots[0];
fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item);
if (btrfs_file_extent_type(node, fi) != BTRFS_FILE_EXTENT_REG)
goto next;
start = btrfs_file_extent_disk_bytenr(node, fi);
len = btrfs_file_extent_disk_num_bytes(node, fi);
ret = populate_csum(trans, csum_root, buf, start, len);
if (ret == -EEXIST)
ret = 0;
if (ret < 0)
goto out;
next:
/*
* TODO: if next leaf is corrupted, jump to nearest next valid
* leaf.
*/
ret = btrfs_next_item(cur_root, path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
goto out;
}
}
out:
btrfs_free_path(path);
free(buf);
return ret;
}
static int fill_csum_tree_from_fs(struct btrfs_trans_handle *trans,
struct btrfs_root *csum_root)
{
struct btrfs_fs_info *fs_info = csum_root->fs_info;
struct btrfs_path *path;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *cur_root;
struct extent_buffer *node;
struct btrfs_key key;
int slot = 0;
int ret = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = BTRFS_FS_TREE_OBJECTID;
key.offset = 0;
key.type = BTRFS_ROOT_ITEM_KEY;
ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (ret > 0) {
ret = -ENOENT;
goto out;
}
while (1) {
node = path->nodes[0];
slot = path->slots[0];
btrfs_item_key_to_cpu(node, &key, slot);
if (key.objectid > BTRFS_LAST_FREE_OBJECTID)
goto out;
if (key.type != BTRFS_ROOT_ITEM_KEY)
goto next;
if (!is_fstree(key.objectid))
goto next;
key.offset = (u64)-1;
cur_root = btrfs_read_fs_root(fs_info, &key);
if (IS_ERR(cur_root) || !cur_root) {
fprintf(stderr, "Fail to read fs/subvol tree: %lld\n",
key.objectid);
goto out;
}
ret = fill_csum_tree_from_one_fs_root(trans, csum_root,
cur_root);
if (ret < 0)
goto out;
next:
ret = btrfs_next_item(tree_root, path);
if (ret > 0) {
ret = 0;
goto out;
}
if (ret < 0)
goto out;
}
out:
btrfs_free_path(path);
return ret;
}
static int fill_csum_tree_from_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *csum_root)
{
struct btrfs_root *extent_root = csum_root->fs_info->extent_root;
struct btrfs_path *path;
struct btrfs_extent_item *ei;
struct extent_buffer *leaf;
char *buf;
struct btrfs_key key;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0) {
btrfs_free_path(path);
return ret;
}
buf = malloc(csum_root->sectorsize);
if (!buf) {
btrfs_free_path(path);
return -ENOMEM;
}
while (1) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(extent_root, path);
if (ret < 0)
break;
if (ret) {
ret = 0;
break;
}
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.type != BTRFS_EXTENT_ITEM_KEY) {
path->slots[0]++;
continue;
}
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
if (!(btrfs_extent_flags(leaf, ei) &
BTRFS_EXTENT_FLAG_DATA)) {
path->slots[0]++;
continue;
}
ret = populate_csum(trans, csum_root, buf, key.objectid,
key.offset);
if (ret)
break;
path->slots[0]++;
}
btrfs_free_path(path);
free(buf);
return ret;
}
/*
* Recalculate the csum and put it into the csum tree.
*
* Extent tree init will wipe out all the extent info, so in that case, we
* can't depend on extent tree, but use fs tree. If search_fs_tree is set, we
* will use fs/subvol trees to init the csum tree.
*/
static int fill_csum_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *csum_root,
int search_fs_tree)
{
if (search_fs_tree)
return fill_csum_tree_from_fs(trans, csum_root);
else
return fill_csum_tree_from_extent(trans, csum_root);
}
struct root_item_info {
/* level of the root */
u8 level;
/* number of nodes at this level, must be 1 for a root */
int node_count;
u64 bytenr;
u64 gen;
struct cache_extent cache_extent;
};
static struct cache_tree *roots_info_cache = NULL;
static void free_roots_info_cache(void)
{
if (!roots_info_cache)
return;
while (!cache_tree_empty(roots_info_cache)) {
struct cache_extent *entry;
struct root_item_info *rii;
entry = first_cache_extent(roots_info_cache);
if (!entry)
break;
remove_cache_extent(roots_info_cache, entry);
rii = container_of(entry, struct root_item_info, cache_extent);
free(rii);
}
free(roots_info_cache);
roots_info_cache = NULL;
}
static int build_roots_info_cache(struct btrfs_fs_info *info)
{
int ret = 0;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_path *path;
if (!roots_info_cache) {
roots_info_cache = malloc(sizeof(*roots_info_cache));
if (!roots_info_cache)
return -ENOMEM;
cache_tree_init(roots_info_cache);
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, info->extent_root, &key, path, 0, 0);
if (ret < 0)
goto out;
leaf = path->nodes[0];
while (1) {
struct btrfs_key found_key;
struct btrfs_extent_item *ei;
struct btrfs_extent_inline_ref *iref;
int slot = path->slots[0];
int type;
u64 flags;
u64 root_id;
u8 level;
struct cache_extent *entry;
struct root_item_info *rii;
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(info->extent_root, path);
if (ret < 0) {
break;
} else if (ret) {
ret = 0;
break;
}
leaf = path->nodes[0];
slot = path->slots[0];
}
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.type != BTRFS_EXTENT_ITEM_KEY &&
found_key.type != BTRFS_METADATA_ITEM_KEY)
goto next;
ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
flags = btrfs_extent_flags(leaf, ei);
if (found_key.type == BTRFS_EXTENT_ITEM_KEY &&
!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK))
goto next;
if (found_key.type == BTRFS_METADATA_ITEM_KEY) {
iref = (struct btrfs_extent_inline_ref *)(ei + 1);
level = found_key.offset;
} else {
struct btrfs_tree_block_info *info;
info = (struct btrfs_tree_block_info *)(ei + 1);
iref = (struct btrfs_extent_inline_ref *)(info + 1);
level = btrfs_tree_block_level(leaf, info);
}
/*
* For a root extent, it must be of the following type and the
* first (and only one) iref in the item.
*/
type = btrfs_extent_inline_ref_type(leaf, iref);
if (type != BTRFS_TREE_BLOCK_REF_KEY)
goto next;
root_id = btrfs_extent_inline_ref_offset(leaf, iref);
entry = lookup_cache_extent(roots_info_cache, root_id, 1);
if (!entry) {
rii = malloc(sizeof(struct root_item_info));
if (!rii) {
ret = -ENOMEM;
goto out;
}
rii->cache_extent.start = root_id;
rii->cache_extent.size = 1;
rii->level = (u8)-1;
entry = &rii->cache_extent;
ret = insert_cache_extent(roots_info_cache, entry);
ASSERT(ret == 0);
} else {
rii = container_of(entry, struct root_item_info,
cache_extent);
}
ASSERT(rii->cache_extent.start == root_id);
ASSERT(rii->cache_extent.size == 1);
if (level > rii->level || rii->level == (u8)-1) {
rii->level = level;
rii->bytenr = found_key.objectid;
rii->gen = btrfs_extent_generation(leaf, ei);
rii->node_count = 1;
} else if (level == rii->level) {
rii->node_count++;
}
next:
path->slots[0]++;
}
out:
btrfs_free_path(path);
return ret;
}
static int maybe_repair_root_item(struct btrfs_fs_info *info,
struct btrfs_path *path,
const struct btrfs_key *root_key,
const int read_only_mode)
{
const u64 root_id = root_key->objectid;
struct cache_extent *entry;
struct root_item_info *rii;
struct btrfs_root_item ri;
unsigned long offset;
entry = lookup_cache_extent(roots_info_cache, root_id, 1);
if (!entry) {
fprintf(stderr,
"Error: could not find extent items for root %llu\n",
root_key->objectid);
return -ENOENT;
}
rii = container_of(entry, struct root_item_info, cache_extent);
ASSERT(rii->cache_extent.start == root_id);
ASSERT(rii->cache_extent.size == 1);
if (rii->node_count != 1) {
fprintf(stderr,
"Error: could not find btree root extent for root %llu\n",
root_id);
return -ENOENT;
}
offset = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]);
read_extent_buffer(path->nodes[0], &ri, offset, sizeof(ri));
if (btrfs_root_bytenr(&ri) != rii->bytenr ||
btrfs_root_level(&ri) != rii->level ||
btrfs_root_generation(&ri) != rii->gen) {
/*
* If we're in repair mode but our caller told us to not update
* the root item, i.e. just check if it needs to be updated, don't
* print this message, since the caller will call us again shortly
* for the same root item without read only mode (the caller will
* open a transaction first).
*/
if (!(read_only_mode && repair))
fprintf(stderr,
"%sroot item for root %llu,"
" current bytenr %llu, current gen %llu, current level %u,"
" new bytenr %llu, new gen %llu, new level %u\n",
(read_only_mode ? "" : "fixing "),
root_id,
btrfs_root_bytenr(&ri), btrfs_root_generation(&ri),
btrfs_root_level(&ri),
rii->bytenr, rii->gen, rii->level);
if (btrfs_root_generation(&ri) > rii->gen) {
fprintf(stderr,
"root %llu has a root item with a more recent gen (%llu) compared to the found root node (%llu)\n",
root_id, btrfs_root_generation(&ri), rii->gen);
return -EINVAL;
}
if (!read_only_mode) {
btrfs_set_root_bytenr(&ri, rii->bytenr);
btrfs_set_root_level(&ri, rii->level);
btrfs_set_root_generation(&ri, rii->gen);
write_extent_buffer(path->nodes[0], &ri,
offset, sizeof(ri));
}
return 1;
}
return 0;
}
/*
* A regression introduced in the 3.17 kernel (more specifically in 3.17-rc2),
* caused read-only snapshots to be corrupted if they were created at a moment
* when the source subvolume/snapshot had orphan items. The issue was that the
* on-disk root items became incorrect, referring to the pre orphan cleanup root
* node instead of the post orphan cleanup root node.
* So this function, and its callees, just detects and fixes those cases. Even
* though the regression was for read-only snapshots, this function applies to
* any snapshot/subvolume root.
* This must be run before any other repair code - not doing it so, makes other
* repair code delete or modify backrefs in the extent tree for example, which
* will result in an inconsistent fs after repairing the root items.
*/
static int repair_root_items(struct btrfs_fs_info *info)
{
struct btrfs_path *path = NULL;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_trans_handle *trans = NULL;
int ret = 0;
int bad_roots = 0;
int need_trans = 0;
ret = build_roots_info_cache(info);
if (ret)
goto out;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = 0;
again:
/*
* Avoid opening and committing transactions if a leaf doesn't have
* any root items that need to be fixed, so that we avoid rotating
* backup roots unnecessarily.
*/
if (need_trans) {
trans = btrfs_start_transaction(info->tree_root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
}
ret = btrfs_search_slot(trans, info->tree_root, &key, path,
0, trans ? 1 : 0);
if (ret < 0)
goto out;
leaf = path->nodes[0];
while (1) {
struct btrfs_key found_key;
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
int no_more_keys = find_next_key(path, &key);
btrfs_release_path(path);
if (trans) {
ret = btrfs_commit_transaction(trans,
info->tree_root);
trans = NULL;
if (ret < 0)
goto out;
}
need_trans = 0;
if (no_more_keys)
break;
goto again;
}
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.type != BTRFS_ROOT_ITEM_KEY)
goto next;
if (found_key.objectid == BTRFS_TREE_RELOC_OBJECTID)
goto next;
ret = maybe_repair_root_item(info, path, &found_key,
trans ? 0 : 1);
if (ret < 0)
goto out;
if (ret) {
if (!trans && repair) {
need_trans = 1;
key = found_key;
btrfs_release_path(path);
goto again;
}
bad_roots++;
}
next:
path->slots[0]++;
}
ret = 0;
out:
free_roots_info_cache();
if (path)
btrfs_free_path(path);
if (trans)
btrfs_commit_transaction(trans, info->tree_root);
if (ret < 0)
return ret;
return bad_roots;
}
const char * const cmd_check_usage[] = {
"btrfs check [options] <device>",
"Check an unmounted btrfs filesystem.",
"",
"-s|--super <superblock> use this superblock copy",
"-b|--backup use the backup root copy",
"--repair try to repair the filesystem",
"--init-csum-tree create a new CRC tree",
"--init-extent-tree create a new extent tree",
"--check-data-csum verify checkums of data blocks",
"--qgroup-report print a report on qgroup consistency",
"--subvol-extents <subvolid> print subvolume extents and sharing state",
"--tree-root <bytenr> use the given bytenr for the tree root",
NULL
};
int cmd_check(int argc, char **argv)
{
struct cache_tree root_cache;
struct btrfs_root *root;
struct btrfs_fs_info *info;
u64 bytenr = 0;
u64 subvolid = 0;
u64 tree_root_bytenr = 0;
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
int ret;
u64 num;
int init_csum_tree = 0;
int readonly = 0;
int qgroup_report = 0;
enum btrfs_open_ctree_flags ctree_flags = OPEN_CTREE_EXCLUSIVE;
while(1) {
int c;
enum { OPT_REPAIR = 257, OPT_INIT_CSUM, OPT_INIT_EXTENT,
OPT_CHECK_CSUM, OPT_READONLY };
static const struct option long_options[] = {
{ "super", required_argument, NULL, 's' },
{ "repair", no_argument, NULL, OPT_REPAIR },
{ "readonly", no_argument, NULL, OPT_READONLY },
{ "init-csum-tree", no_argument, NULL, OPT_INIT_CSUM },
{ "init-extent-tree", no_argument, NULL, OPT_INIT_EXTENT },
{ "check-data-csum", no_argument, NULL, OPT_CHECK_CSUM },
{ "backup", no_argument, NULL, 'b' },
{ "subvol-extents", required_argument, NULL, 'E' },
{ "qgroup-report", no_argument, NULL, 'Q' },
{ "tree-root", required_argument, NULL, 'r' },
{ NULL, 0, NULL, 0}
};
c = getopt_long(argc, argv, "as:br:", long_options, NULL);
if (c < 0)
break;
switch(c) {
case 'a': /* ignored */ break;
case 'b':
ctree_flags |= OPEN_CTREE_BACKUP_ROOT;
break;
case 's':
num = arg_strtou64(optarg);
if (num >= BTRFS_SUPER_MIRROR_MAX) {
fprintf(stderr,
"ERROR: super mirror should be less than: %d\n",
BTRFS_SUPER_MIRROR_MAX);
exit(1);
}
bytenr = btrfs_sb_offset(((int)num));
printf("using SB copy %llu, bytenr %llu\n", num,
(unsigned long long)bytenr);
break;
case 'Q':
qgroup_report = 1;
break;
case 'E':
subvolid = arg_strtou64(optarg);
break;
case 'r':
tree_root_bytenr = arg_strtou64(optarg);
break;
case '?':
case 'h':
usage(cmd_check_usage);
case OPT_REPAIR:
printf("enabling repair mode\n");
repair = 1;
ctree_flags |= OPEN_CTREE_WRITES;
break;
case OPT_READONLY:
readonly = 1;
break;
case OPT_INIT_CSUM:
printf("Creating a new CRC tree\n");
init_csum_tree = 1;
repair = 1;
ctree_flags |= OPEN_CTREE_WRITES;
break;
case OPT_INIT_EXTENT:
init_extent_tree = 1;
ctree_flags |= (OPEN_CTREE_WRITES |
OPEN_CTREE_NO_BLOCK_GROUPS);
repair = 1;
break;
case OPT_CHECK_CSUM:
check_data_csum = 1;
break;
}
}
argc = argc - optind;
if (check_argc_exact(argc, 1))
usage(cmd_check_usage);
/* This check is the only reason for --readonly to exist */
if (readonly && repair) {
fprintf(stderr, "Repair options are not compatible with --readonly\n");
exit(1);
}
radix_tree_init();
cache_tree_init(&root_cache);
if((ret = check_mounted(argv[optind])) < 0) {
fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret));
goto err_out;
} else if(ret) {
fprintf(stderr, "%s is currently mounted. Aborting.\n", argv[optind]);
ret = -EBUSY;
goto err_out;
}
/* only allow partial opening under repair mode */
if (repair)
ctree_flags |= OPEN_CTREE_PARTIAL;
info = open_ctree_fs_info(argv[optind], bytenr, tree_root_bytenr,
ctree_flags);
if (!info) {
fprintf(stderr, "Couldn't open file system\n");
ret = -EIO;
goto err_out;
}
root = info->fs_root;
/*
* repair mode will force us to commit transaction which
* will make us fail to load log tree when mounting.
*/
if (repair && btrfs_super_log_root(info->super_copy)) {
ret = ask_user("repair mode will force to clear out log tree, Are you sure?");
if (!ret) {
ret = 1;
goto close_out;
}
ret = zero_log_tree(root);
if (ret) {
fprintf(stderr, "fail to zero log tree\n");
goto close_out;
}
}
uuid_unparse(info->super_copy->fsid, uuidbuf);
if (qgroup_report) {
printf("Print quota groups for %s\nUUID: %s\n", argv[optind],
uuidbuf);
ret = qgroup_verify_all(info);
if (ret == 0)
print_qgroup_report(1);
goto close_out;
}
if (subvolid) {
printf("Print extent state for subvolume %llu on %s\nUUID: %s\n",
subvolid, argv[optind], uuidbuf);
ret = print_extent_state(info, subvolid);
goto close_out;
}
printf("Checking filesystem on %s\nUUID: %s\n", argv[optind], uuidbuf);
if (!extent_buffer_uptodate(info->tree_root->node) ||
!extent_buffer_uptodate(info->dev_root->node) ||
!extent_buffer_uptodate(info->chunk_root->node)) {
fprintf(stderr, "Critical roots corrupted, unable to fsck the FS\n");
ret = -EIO;
goto close_out;
}
if (init_extent_tree || init_csum_tree) {
struct btrfs_trans_handle *trans;
trans = btrfs_start_transaction(info->extent_root, 0);
if (IS_ERR(trans)) {
fprintf(stderr, "Error starting transaction\n");
ret = PTR_ERR(trans);
goto close_out;
}
if (init_extent_tree) {
printf("Creating a new extent tree\n");
ret = reinit_extent_tree(trans, info);
if (ret)
goto close_out;
}
if (init_csum_tree) {
fprintf(stderr, "Reinit crc root\n");
ret = btrfs_fsck_reinit_root(trans, info->csum_root, 0);
if (ret) {
fprintf(stderr, "crc root initialization failed\n");
ret = -EIO;
goto close_out;
}
ret = fill_csum_tree(trans, info->csum_root,
init_extent_tree);
if (ret) {
fprintf(stderr, "crc refilling failed\n");
return -EIO;
}
}
/*
* Ok now we commit and run the normal fsck, which will add
* extent entries for all of the items it finds.
*/
ret = btrfs_commit_transaction(trans, info->extent_root);
if (ret)
goto close_out;
}
if (!extent_buffer_uptodate(info->extent_root->node)) {
fprintf(stderr, "Critical roots corrupted, unable to fsck the FS\n");
ret = -EIO;
goto close_out;
}
if (!extent_buffer_uptodate(info->csum_root->node)) {
fprintf(stderr, "Checksum root corrupted, rerun with --init-csum-tree option\n");
ret = -EIO;
goto close_out;
}
fprintf(stderr, "checking extents\n");
ret = check_chunks_and_extents(root);
if (ret)
fprintf(stderr, "Errors found in extent allocation tree or chunk allocation\n");
ret = repair_root_items(info);
if (ret < 0)
goto close_out;
if (repair) {
fprintf(stderr, "Fixed %d roots.\n", ret);
ret = 0;
} else if (ret > 0) {
fprintf(stderr,
"Found %d roots with an outdated root item.\n",
ret);
fprintf(stderr,
"Please run a filesystem check with the option --repair to fix them.\n");
ret = 1;
goto close_out;
}
fprintf(stderr, "checking free space cache\n");
ret = check_space_cache(root);
if (ret)
goto out;
/*
* We used to have to have these hole extents in between our real
* extents so if we don't have this flag set we need to make sure there
* are no gaps in the file extents for inodes, otherwise we can just
* ignore it when this happens.
*/
no_holes = btrfs_fs_incompat(root->fs_info,
BTRFS_FEATURE_INCOMPAT_NO_HOLES);
fprintf(stderr, "checking fs roots\n");
ret = check_fs_roots(root, &root_cache);
if (ret)
goto out;
fprintf(stderr, "checking csums\n");
ret = check_csums(root);
if (ret)
goto out;
fprintf(stderr, "checking root refs\n");
ret = check_root_refs(root, &root_cache);
if (ret)
goto out;
while (repair && !list_empty(&root->fs_info->recow_ebs)) {
struct extent_buffer *eb;
eb = list_first_entry(&root->fs_info->recow_ebs,
struct extent_buffer, recow);
list_del_init(&eb->recow);
ret = recow_extent_buffer(root, eb);
if (ret)
break;
}
while (!list_empty(&delete_items)) {
struct bad_item *bad;
bad = list_first_entry(&delete_items, struct bad_item, list);
list_del_init(&bad->list);
if (repair)
ret = delete_bad_item(root, bad);
free(bad);
}
if (info->quota_enabled) {
int err;
fprintf(stderr, "checking quota groups\n");
err = qgroup_verify_all(info);
if (err)
goto out;
}
if (!list_empty(&root->fs_info->recow_ebs)) {
fprintf(stderr, "Transid errors in file system\n");
ret = 1;
}
out:
print_qgroup_report(0);
if (found_old_backref) { /*
* there was a disk format change when mixed
* backref was in testing tree. The old format
* existed about one week.
*/
printf("\n * Found old mixed backref format. "
"The old format is not supported! *"
"\n * Please mount the FS in readonly mode, "
"backup data and re-format the FS. *\n\n");
ret = 1;
}
printf("found %llu bytes used err is %d\n",
(unsigned long long)bytes_used, ret);
printf("total csum bytes: %llu\n",(unsigned long long)total_csum_bytes);
printf("total tree bytes: %llu\n",
(unsigned long long)total_btree_bytes);
printf("total fs tree bytes: %llu\n",
(unsigned long long)total_fs_tree_bytes);
printf("total extent tree bytes: %llu\n",
(unsigned long long)total_extent_tree_bytes);
printf("btree space waste bytes: %llu\n",
(unsigned long long)btree_space_waste);
printf("file data blocks allocated: %llu\n referenced %llu\n",
(unsigned long long)data_bytes_allocated,
(unsigned long long)data_bytes_referenced);
printf("%s\n", PACKAGE_STRING);
free_root_recs_tree(&root_cache);
close_out:
close_ctree(root);
err_out:
return ret;
}