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btrfs-progs/btrfs-image.c

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/*
* Copyright (C) 2008 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.
*/
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE 1
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <zlib.h>
#include "kerncompat.h"
#include "crc32c.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "utils.h"
#include "version.h"
#include "volumes.h"
#include "extent_io.h"
#define HEADER_MAGIC 0xbd5c25e27295668bULL
#define MAX_PENDING_SIZE (256 * 1024)
#define BLOCK_SIZE 1024
#define BLOCK_MASK (BLOCK_SIZE - 1)
#define COMPRESS_NONE 0
#define COMPRESS_ZLIB 1
struct meta_cluster_item {
__le64 bytenr;
__le32 size;
} __attribute__ ((__packed__));
struct meta_cluster_header {
__le64 magic;
__le64 bytenr;
__le32 nritems;
u8 compress;
} __attribute__ ((__packed__));
/* cluster header + index items + buffers */
struct meta_cluster {
struct meta_cluster_header header;
struct meta_cluster_item items[];
} __attribute__ ((__packed__));
#define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
sizeof(struct meta_cluster_item))
struct fs_chunk {
u64 logical;
u64 physical;
u64 bytes;
struct rb_node n;
};
struct async_work {
struct list_head list;
struct list_head ordered;
u64 start;
u64 size;
u8 *buffer;
size_t bufsize;
int error;
};
struct metadump_struct {
struct btrfs_root *root;
FILE *out;
struct meta_cluster *cluster;
pthread_t *threads;
size_t num_threads;
pthread_mutex_t mutex;
pthread_cond_t cond;
struct rb_root name_tree;
struct list_head list;
struct list_head ordered;
size_t num_items;
size_t num_ready;
u64 pending_start;
u64 pending_size;
int compress_level;
int done;
int data;
int sanitize_names;
};
struct name {
struct rb_node n;
char *val;
char *sub;
u32 len;
};
struct mdrestore_struct {
FILE *in;
FILE *out;
pthread_t *threads;
size_t num_threads;
pthread_mutex_t mutex;
pthread_cond_t cond;
struct rb_root chunk_tree;
struct list_head list;
size_t num_items;
u64 leafsize;
u64 devid;
u8 uuid[BTRFS_UUID_SIZE];
u8 fsid[BTRFS_FSID_SIZE];
int compress_method;
int done;
int error;
int old_restore;
int fixup_offset;
int multi_devices;
struct btrfs_fs_info *info;
};
static void print_usage(void) __attribute__((noreturn));
static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
u64 search, u64 cluster_bytenr);
static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size);
static void csum_block(u8 *buf, size_t len)
{
char result[BTRFS_CRC32_SIZE];
u32 crc = ~(u32)0;
crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, result);
memcpy(buf, result, BTRFS_CRC32_SIZE);
}
static int has_name(struct btrfs_key *key)
{
switch (key->type) {
case BTRFS_DIR_ITEM_KEY:
case BTRFS_DIR_INDEX_KEY:
case BTRFS_INODE_REF_KEY:
case BTRFS_INODE_EXTREF_KEY:
case BTRFS_XATTR_ITEM_KEY:
return 1;
default:
break;
}
return 0;
}
static char *generate_garbage(u32 name_len)
{
char *buf = malloc(name_len);
int i;
if (!buf)
return NULL;
for (i = 0; i < name_len; i++) {
char c = rand() % 94 + 33;
if (c == '/')
c++;
buf[i] = c;
}
return buf;
}
static int name_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
{
struct name *entry = rb_entry(a, struct name, n);
struct name *ins = rb_entry(b, struct name, n);
u32 len;
len = min(ins->len, entry->len);
return memcmp(ins->val, entry->val, len);
}
static int chunk_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
{
struct fs_chunk *entry = rb_entry(a, struct fs_chunk, n);
struct fs_chunk *ins = rb_entry(b, struct fs_chunk, n);
if (fuzz && ins->logical >= entry->logical &&
ins->logical < entry->logical + entry->bytes)
return 0;
if (ins->logical < entry->logical)
return -1;
else if (ins->logical > entry->logical)
return 1;
return 0;
}
static void tree_insert(struct rb_root *root, struct rb_node *ins,
int (*cmp)(struct rb_node *a, struct rb_node *b,
int fuzz))
{
struct rb_node ** p = &root->rb_node;
struct rb_node * parent = NULL;
int dir;
while(*p) {
parent = *p;
dir = cmp(*p, ins, 0);
if (dir < 0)
p = &(*p)->rb_left;
else if (dir > 0)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(ins, parent, p);
rb_insert_color(ins, root);
}
static struct rb_node *tree_search(struct rb_root *root,
struct rb_node *search,
int (*cmp)(struct rb_node *a,
struct rb_node *b, int fuzz),
int fuzz)
{
struct rb_node *n = root->rb_node;
int dir;
while (n) {
dir = cmp(n, search, fuzz);
if (dir < 0)
n = n->rb_left;
else if (dir > 0)
n = n->rb_right;
else
return n;
}
return NULL;
}
static char *find_collision(struct metadump_struct *md, char *name,
u32 name_len)
{
struct name *val;
struct rb_node *entry;
struct name tmp;
unsigned long checksum;
int found = 0;
int i;
tmp.val = name;
tmp.len = name_len;
entry = tree_search(&md->name_tree, &tmp.n, name_cmp, 0);
if (entry) {
val = rb_entry(entry, struct name, n);
free(name);
return val->sub;
}
val = malloc(sizeof(struct name));
if (!val) {
fprintf(stderr, "Couldn't sanitize name, enomem\n");
free(name);
return NULL;
}
memset(val, 0, sizeof(*val));
val->val = name;
val->len = name_len;
val->sub = malloc(name_len);
if (!val->sub) {
fprintf(stderr, "Couldn't sanitize name, enomem\n");
free(val);
free(name);
return NULL;
}
checksum = crc32c(~1, val->val, name_len);
memset(val->sub, ' ', name_len);
i = 0;
while (1) {
if (crc32c(~1, val->sub, name_len) == checksum &&
memcmp(val->sub, val->val, val->len)) {
found = 1;
break;
}
if (val->sub[i] == 127) {
do {
i++;
if (i >= name_len)
break;
} while (val->sub[i] == 127);
if (i >= name_len)
break;
val->sub[i]++;
if (val->sub[i] == '/')
val->sub[i]++;
memset(val->sub, ' ', i);
i = 0;
continue;
} else {
val->sub[i]++;
if (val->sub[i] == '/')
val->sub[i]++;
}
}
if (!found) {
fprintf(stderr, "Couldn't find a collision for '%.*s', "
"generating normal garbage, it won't match indexes\n",
val->len, val->val);
for (i = 0; i < name_len; i++) {
char c = rand() % 94 + 33;
if (c == '/')
c++;
val->sub[i] = c;
}
}
tree_insert(&md->name_tree, &val->n, name_cmp);
return val->sub;
}
static void sanitize_dir_item(struct metadump_struct *md, struct extent_buffer *eb,
int slot)
{
struct btrfs_dir_item *dir_item;
char *buf;
char *garbage;
unsigned long name_ptr;
u32 total_len;
u32 cur = 0;
u32 this_len;
u32 name_len;
int free_garbage = (md->sanitize_names == 1);
dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
total_len = btrfs_item_size_nr(eb, slot);
while (cur < total_len) {
this_len = sizeof(*dir_item) +
btrfs_dir_name_len(eb, dir_item) +
btrfs_dir_data_len(eb, dir_item);
name_ptr = (unsigned long)(dir_item + 1);
name_len = btrfs_dir_name_len(eb, dir_item);
if (md->sanitize_names > 1) {
buf = malloc(name_len);
if (!buf) {
fprintf(stderr, "Couldn't sanitize name, "
"enomem\n");
return;
}
read_extent_buffer(eb, buf, name_ptr, name_len);
garbage = find_collision(md, buf, name_len);
} else {
garbage = generate_garbage(name_len);
}
if (!garbage) {
fprintf(stderr, "Couldn't sanitize name, enomem\n");
return;
}
write_extent_buffer(eb, garbage, name_ptr, name_len);
cur += this_len;
dir_item = (struct btrfs_dir_item *)((char *)dir_item +
this_len);
if (free_garbage)
free(garbage);
}
}
static void sanitize_inode_ref(struct metadump_struct *md,
struct extent_buffer *eb, int slot, int ext)
{
struct btrfs_inode_extref *extref;
struct btrfs_inode_ref *ref;
char *garbage, *buf;
unsigned long ptr;
unsigned long name_ptr;
u32 item_size;
u32 cur_offset = 0;
int len;
int free_garbage = (md->sanitize_names == 1);
item_size = btrfs_item_size_nr(eb, slot);
ptr = btrfs_item_ptr_offset(eb, slot);
while (cur_offset < item_size) {
if (ext) {
extref = (struct btrfs_inode_extref *)(ptr +
cur_offset);
name_ptr = (unsigned long)(&extref->name);
len = btrfs_inode_extref_name_len(eb, extref);
cur_offset += sizeof(*extref);
} else {
ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
len = btrfs_inode_ref_name_len(eb, ref);
name_ptr = (unsigned long)(ref + 1);
cur_offset += sizeof(*ref);
}
cur_offset += len;
if (md->sanitize_names > 1) {
buf = malloc(len);
if (!buf) {
fprintf(stderr, "Couldn't sanitize name, "
"enomem\n");
return;
}
read_extent_buffer(eb, buf, name_ptr, len);
garbage = find_collision(md, buf, len);
} else {
garbage = generate_garbage(len);
}
if (!garbage) {
fprintf(stderr, "Couldn't sanitize name, enomem\n");
return;
}
write_extent_buffer(eb, garbage, name_ptr, len);
if (free_garbage)
free(garbage);
}
}
static void sanitize_xattr(struct metadump_struct *md,
struct extent_buffer *eb, int slot)
{
struct btrfs_dir_item *dir_item;
unsigned long data_ptr;
u32 data_len;
dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
data_len = btrfs_dir_data_len(eb, dir_item);
data_ptr = (unsigned long)((char *)(dir_item + 1) +
btrfs_dir_name_len(eb, dir_item));
memset_extent_buffer(eb, 0, data_ptr, data_len);
}
static void sanitize_name(struct metadump_struct *md, u8 *dst,
struct extent_buffer *src, struct btrfs_key *key,
int slot)
{
struct extent_buffer *eb;
eb = alloc_dummy_eb(src->start, src->len);
if (!eb) {
fprintf(stderr, "Couldn't sanitize name, no memory\n");
return;
}
memcpy(eb->data, dst, eb->len);
switch (key->type) {
case BTRFS_DIR_ITEM_KEY:
case BTRFS_DIR_INDEX_KEY:
sanitize_dir_item(md, eb, slot);
break;
case BTRFS_INODE_REF_KEY:
sanitize_inode_ref(md, eb, slot, 0);
break;
case BTRFS_INODE_EXTREF_KEY:
sanitize_inode_ref(md, eb, slot, 1);
break;
case BTRFS_XATTR_ITEM_KEY:
sanitize_xattr(md, eb, slot);
break;
default:
break;
}
memcpy(dst, eb->data, eb->len);
free(eb);
}
/*
* zero inline extents and csum items
*/
static void zero_items(struct metadump_struct *md, u8 *dst,
struct extent_buffer *src)
{
struct btrfs_file_extent_item *fi;
struct btrfs_item *item;
struct btrfs_key key;
u32 nritems = btrfs_header_nritems(src);
size_t size;
unsigned long ptr;
int i, extent_type;
for (i = 0; i < nritems; i++) {
item = btrfs_item_nr(i);
btrfs_item_key_to_cpu(src, &key, i);
if (key.type == BTRFS_CSUM_ITEM_KEY) {
size = btrfs_item_size_nr(src, i);
memset(dst + btrfs_leaf_data(src) +
btrfs_item_offset_nr(src, i), 0, size);
continue;
}
if (md->sanitize_names && has_name(&key)) {
sanitize_name(md, dst, src, &key, i);
continue;
}
if (key.type != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(src, i, struct btrfs_file_extent_item);
extent_type = btrfs_file_extent_type(src, fi);
if (extent_type != BTRFS_FILE_EXTENT_INLINE)
continue;
ptr = btrfs_file_extent_inline_start(fi);
size = btrfs_file_extent_inline_item_len(src, item);
memset(dst + ptr, 0, size);
}
}
/*
* copy buffer and zero useless data in the buffer
*/
static void copy_buffer(struct metadump_struct *md, u8 *dst,
struct extent_buffer *src)
{
int level;
size_t size;
u32 nritems;
memcpy(dst, src->data, src->len);
if (src->start == BTRFS_SUPER_INFO_OFFSET)
return;
level = btrfs_header_level(src);
nritems = btrfs_header_nritems(src);
if (nritems == 0) {
size = sizeof(struct btrfs_header);
memset(dst + size, 0, src->len - size);
} else if (level == 0) {
size = btrfs_leaf_data(src) +
btrfs_item_offset_nr(src, nritems - 1) -
btrfs_item_nr_offset(nritems);
memset(dst + btrfs_item_nr_offset(nritems), 0, size);
zero_items(md, dst, src);
} else {
size = offsetof(struct btrfs_node, ptrs) +
sizeof(struct btrfs_key_ptr) * nritems;
memset(dst + size, 0, src->len - size);
}
csum_block(dst, src->len);
}
static void *dump_worker(void *data)
{
struct metadump_struct *md = (struct metadump_struct *)data;
struct async_work *async;
int ret;
while (1) {
pthread_mutex_lock(&md->mutex);
while (list_empty(&md->list)) {
if (md->done) {
pthread_mutex_unlock(&md->mutex);
goto out;
}
pthread_cond_wait(&md->cond, &md->mutex);
}
async = list_entry(md->list.next, struct async_work, list);
list_del_init(&async->list);
pthread_mutex_unlock(&md->mutex);
if (md->compress_level > 0) {
u8 *orig = async->buffer;
async->bufsize = compressBound(async->size);
async->buffer = malloc(async->bufsize);
ret = compress2(async->buffer,
(unsigned long *)&async->bufsize,
orig, async->size, md->compress_level);
if (ret != Z_OK)
async->error = 1;
free(orig);
}
pthread_mutex_lock(&md->mutex);
md->num_ready++;
pthread_mutex_unlock(&md->mutex);
}
out:
pthread_exit(NULL);
}
static void meta_cluster_init(struct metadump_struct *md, u64 start)
{
struct meta_cluster_header *header;
md->num_items = 0;
md->num_ready = 0;
header = &md->cluster->header;
header->magic = cpu_to_le64(HEADER_MAGIC);
header->bytenr = cpu_to_le64(start);
header->nritems = cpu_to_le32(0);
header->compress = md->compress_level > 0 ?
COMPRESS_ZLIB : COMPRESS_NONE;
}
static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
FILE *out, int num_threads, int compress_level,
int sanitize_names)
{
int i, ret = 0;
memset(md, 0, sizeof(*md));
pthread_cond_init(&md->cond, NULL);
pthread_mutex_init(&md->mutex, NULL);
INIT_LIST_HEAD(&md->list);
INIT_LIST_HEAD(&md->ordered);
md->root = root;
md->out = out;
md->pending_start = (u64)-1;
md->compress_level = compress_level;
md->cluster = calloc(1, BLOCK_SIZE);
md->sanitize_names = sanitize_names;
if (sanitize_names > 1)
crc32c_optimization_init();
if (!md->cluster) {
pthread_cond_destroy(&md->cond);
pthread_mutex_destroy(&md->mutex);
return -ENOMEM;
}
meta_cluster_init(md, 0);
if (!num_threads)
return 0;
md->name_tree.rb_node = NULL;
md->num_threads = num_threads;
md->threads = calloc(num_threads, sizeof(pthread_t));
if (!md->threads) {
free(md->cluster);
pthread_cond_destroy(&md->cond);
pthread_mutex_destroy(&md->mutex);
return -ENOMEM;
}
for (i = 0; i < num_threads; i++) {
ret = pthread_create(md->threads + i, NULL, dump_worker, md);
if (ret)
break;
}
if (ret) {
pthread_mutex_lock(&md->mutex);
md->done = 1;
pthread_cond_broadcast(&md->cond);
pthread_mutex_unlock(&md->mutex);
for (i--; i >= 0; i--)
pthread_join(md->threads[i], NULL);
pthread_cond_destroy(&md->cond);
pthread_mutex_destroy(&md->mutex);
free(md->cluster);
free(md->threads);
}
return ret;
}
static void metadump_destroy(struct metadump_struct *md)
{
int i;
struct rb_node *n;
pthread_mutex_lock(&md->mutex);
md->done = 1;
pthread_cond_broadcast(&md->cond);
pthread_mutex_unlock(&md->mutex);
for (i = 0; i < md->num_threads; i++)
pthread_join(md->threads[i], NULL);
pthread_cond_destroy(&md->cond);
pthread_mutex_destroy(&md->mutex);
while ((n = rb_first(&md->name_tree))) {
struct name *name;
name = rb_entry(n, struct name, n);
rb_erase(n, &md->name_tree);
free(name->val);
free(name->sub);
free(name);
}
free(md->threads);
free(md->cluster);
}
static int write_zero(FILE *out, size_t size)
{
static char zero[BLOCK_SIZE];
return fwrite(zero, size, 1, out);
}
static int write_buffers(struct metadump_struct *md, u64 *next)
{
struct meta_cluster_header *header = &md->cluster->header;
struct meta_cluster_item *item;
struct async_work *async;
u64 bytenr = 0;
u32 nritems = 0;
int ret;
int err = 0;
if (list_empty(&md->ordered))
goto out;
/* wait until all buffers are compressed */
while (md->num_items > md->num_ready) {
struct timespec ts = {
.tv_sec = 0,
.tv_nsec = 10000000,
};
pthread_mutex_unlock(&md->mutex);
nanosleep(&ts, NULL);
pthread_mutex_lock(&md->mutex);
}
/* setup and write index block */
list_for_each_entry(async, &md->ordered, ordered) {
item = md->cluster->items + nritems;
item->bytenr = cpu_to_le64(async->start);
item->size = cpu_to_le32(async->bufsize);
nritems++;
}
header->nritems = cpu_to_le32(nritems);
ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
if (ret != 1) {
fprintf(stderr, "Error writing out cluster: %d\n", errno);
return -EIO;
}
/* write buffers */
bytenr += le64_to_cpu(header->bytenr) + BLOCK_SIZE;
while (!list_empty(&md->ordered)) {
async = list_entry(md->ordered.next, struct async_work,
ordered);
list_del_init(&async->ordered);
bytenr += async->bufsize;
if (!err)
ret = fwrite(async->buffer, async->bufsize, 1,
md->out);
if (ret != 1) {
err = -EIO;
ret = 0;
fprintf(stderr, "Error writing out cluster: %d\n",
errno);
}
free(async->buffer);
free(async);
}
/* zero unused space in the last block */
if (!err && bytenr & BLOCK_MASK) {
size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
bytenr += size;
ret = write_zero(md->out, size);
if (ret != 1) {
fprintf(stderr, "Error zeroing out buffer: %d\n",
errno);
err = -EIO;
}
}
out:
*next = bytenr;
return err;
}
static int read_data_extent(struct metadump_struct *md,
struct async_work *async)
{
struct btrfs_multi_bio *multi = NULL;
struct btrfs_device *device;
u64 bytes_left = async->size;
u64 logical = async->start;
u64 offset = 0;
u64 bytenr;
u64 read_len;
ssize_t done;
int fd;
int ret;
while (bytes_left) {
read_len = bytes_left;
ret = btrfs_map_block(&md->root->fs_info->mapping_tree, READ,
logical, &read_len, &multi, 0, NULL);
if (ret) {
fprintf(stderr, "Couldn't map data block %d\n", ret);
return ret;
}
device = multi->stripes[0].dev;
if (device->fd == 0) {
fprintf(stderr,
"Device we need to read from is not open\n");
free(multi);
return -EIO;
}
fd = device->fd;
bytenr = multi->stripes[0].physical;
free(multi);
read_len = min(read_len, bytes_left);
done = pread64(fd, async->buffer+offset, read_len, bytenr);
if (done < read_len) {
if (done < 0)
fprintf(stderr, "Error reading extent %d\n",
errno);
else
fprintf(stderr, "Short read\n");
return -EIO;
}
bytes_left -= done;
offset += done;
logical += done;
}
return 0;
}
static int flush_pending(struct metadump_struct *md, int done)
{
struct async_work *async = NULL;
struct extent_buffer *eb;
u64 blocksize = md->root->nodesize;
u64 start;
u64 size;
size_t offset;
int ret = 0;
if (md->pending_size) {
async = calloc(1, sizeof(*async));
if (!async)
return -ENOMEM;
async->start = md->pending_start;
async->size = md->pending_size;
async->bufsize = async->size;
async->buffer = malloc(async->bufsize);
if (!async->buffer) {
free(async);
return -ENOMEM;
}
offset = 0;
start = async->start;
size = async->size;
if (md->data) {
ret = read_data_extent(md, async);
if (ret) {
free(async->buffer);
free(async);
return ret;
}
}
while (!md->data && size > 0) {
u64 this_read = min(blocksize, size);
eb = read_tree_block(md->root, start, this_read, 0);
if (!eb) {
free(async->buffer);
free(async);
fprintf(stderr,
"Error reading metadata block\n");
return -EIO;
}
copy_buffer(md, async->buffer + offset, eb);
free_extent_buffer(eb);
start += this_read;
offset += this_read;
size -= this_read;
}
md->pending_start = (u64)-1;
md->pending_size = 0;
} else if (!done) {
return 0;
}
pthread_mutex_lock(&md->mutex);
if (async) {
list_add_tail(&async->ordered, &md->ordered);
md->num_items++;
if (md->compress_level > 0) {
list_add_tail(&async->list, &md->list);
pthread_cond_signal(&md->cond);
} else {
md->num_ready++;
}
}
if (md->num_items >= ITEMS_PER_CLUSTER || done) {
ret = write_buffers(md, &start);
if (ret)
fprintf(stderr, "Error writing buffers %d\n",
errno);
else
meta_cluster_init(md, start);
}
pthread_mutex_unlock(&md->mutex);
return ret;
}
static int add_extent(u64 start, u64 size, struct metadump_struct *md,
int data)
{
int ret;
if (md->data != data ||
md->pending_size + size > MAX_PENDING_SIZE ||
md->pending_start + md->pending_size != start) {
ret = flush_pending(md, 0);
if (ret)
return ret;
md->pending_start = start;
}
readahead_tree_block(md->root, start, size, 0);
md->pending_size += size;
md->data = data;
return 0;
}
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
static int is_tree_block(struct btrfs_root *extent_root,
struct btrfs_path *path, u64 bytenr)
{
struct extent_buffer *leaf;
struct btrfs_key key;
u64 ref_objectid;
int ret;
leaf = path->nodes[0];
while (1) {
struct btrfs_extent_ref_v0 *ref_item;
path->slots[0]++;
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(extent_root, path);
if (ret < 0)
return ret;
if (ret > 0)
break;
leaf = path->nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid != bytenr)
break;
if (key.type != BTRFS_EXTENT_REF_V0_KEY)
continue;
ref_item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_ref_v0);
ref_objectid = btrfs_ref_objectid_v0(leaf, ref_item);
if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID)
return 1;
break;
}
return 0;
}
#endif
static int copy_tree_blocks(struct btrfs_root *root, struct extent_buffer *eb,
struct metadump_struct *metadump, int root_tree)
{
struct extent_buffer *tmp;
struct btrfs_root_item *ri;
struct btrfs_key key;
u64 bytenr;
int level;
int nritems = 0;
int i = 0;
int ret;
ret = add_extent(btrfs_header_bytenr(eb), root->leafsize, metadump, 0);
if (ret) {
fprintf(stderr, "Error adding metadata block\n");
return ret;
}
if (btrfs_header_level(eb) == 0 && !root_tree)
return 0;
level = btrfs_header_level(eb);
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;
ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
bytenr = btrfs_disk_root_bytenr(eb, ri);
tmp = read_tree_block(root, bytenr, root->leafsize, 0);
if (!tmp) {
fprintf(stderr,
"Error reading log root block\n");
return -EIO;
}
ret = copy_tree_blocks(root, tmp, metadump, 0);
free_extent_buffer(tmp);
if (ret)
return ret;
} else {
bytenr = btrfs_node_blockptr(eb, i);
tmp = read_tree_block(root, bytenr, root->leafsize, 0);
if (!tmp) {
fprintf(stderr, "Error reading log block\n");
return -EIO;
}
ret = copy_tree_blocks(root, tmp, metadump, root_tree);
free_extent_buffer(tmp);
if (ret)
return ret;
}
}
return 0;
}
static int copy_log_trees(struct btrfs_root *root,
struct metadump_struct *metadump,
struct btrfs_path *path)
{
u64 blocknr = btrfs_super_log_root(root->fs_info->super_copy);
if (blocknr == 0)
return 0;
if (!root->fs_info->log_root_tree ||
!root->fs_info->log_root_tree->node) {
fprintf(stderr, "Error copying tree log, it wasn't setup\n");
return -EIO;
}
return copy_tree_blocks(root, root->fs_info->log_root_tree->node,
metadump, 1);
}
static int copy_space_cache(struct btrfs_root *root,
struct metadump_struct *metadump,
struct btrfs_path *path)
{
struct extent_buffer *leaf;
struct btrfs_file_extent_item *fi;
struct btrfs_key key;
u64 bytenr, num_bytes;
int ret;
root = root->fs_info->tree_root;
key.objectid = 0;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
fprintf(stderr, "Error searching for free space inode %d\n",
ret);
return ret;
}
while (1) {
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
if (ret < 0) {
fprintf(stderr, "Error going to next leaf "
"%d\n", ret);
return ret;
}
if (ret > 0)
break;
leaf = path->nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.type != BTRFS_EXTENT_DATA_KEY) {
path->slots[0]++;
continue;
}
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(leaf, fi) !=
BTRFS_FILE_EXTENT_REG) {
path->slots[0]++;
continue;
}
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
ret = add_extent(bytenr, num_bytes, metadump, 1);
if (ret) {
fprintf(stderr, "Error adding space cache blocks %d\n",
ret);
btrfs_release_path(path);
return ret;
}
path->slots[0]++;
}
return 0;
}
static int copy_from_extent_tree(struct metadump_struct *metadump,
struct btrfs_path *path)
{
struct btrfs_root *extent_root;
struct extent_buffer *leaf;
struct btrfs_extent_item *ei;
struct btrfs_key key;
u64 bytenr;
u64 num_bytes;
int ret;
extent_root = metadump->root->fs_info->extent_root;
bytenr = BTRFS_SUPER_INFO_OFFSET + 4096;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0) {
fprintf(stderr, "Error searching extent root %d\n", ret);
return ret;
}
ret = 0;
while (1) {
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(extent_root, path);
if (ret < 0) {
fprintf(stderr, "Error going to next leaf %d"
"\n", ret);
break;
}
if (ret > 0) {
ret = 0;
break;
}
leaf = path->nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid < bytenr ||
(key.type != BTRFS_EXTENT_ITEM_KEY &&
key.type != BTRFS_METADATA_ITEM_KEY)) {
path->slots[0]++;
continue;
}
bytenr = key.objectid;
if (key.type == BTRFS_METADATA_ITEM_KEY)
num_bytes = extent_root->leafsize;
else
num_bytes = key.offset;
if (btrfs_item_size_nr(leaf, path->slots[0]) > sizeof(*ei)) {
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
if (btrfs_extent_flags(leaf, ei) &
BTRFS_EXTENT_FLAG_TREE_BLOCK) {
ret = add_extent(bytenr, num_bytes, metadump,
0);
if (ret) {
fprintf(stderr, "Error adding block "
"%d\n", ret);
break;
}
}
} else {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
ret = is_tree_block(extent_root, path, bytenr);
if (ret < 0) {
fprintf(stderr, "Error checking tree block "
"%d\n", ret);
break;
}
if (ret) {
ret = add_extent(bytenr, num_bytes, metadump,
0);
if (ret) {
fprintf(stderr, "Error adding block "
"%d\n", ret);
break;
}
}
ret = 0;
#else
fprintf(stderr, "Either extent tree corruption or "
"you haven't built with V0 support\n");
ret = -EIO;
break;
#endif
}
bytenr += num_bytes;
}
btrfs_release_path(path);
return ret;
}
static int create_metadump(const char *input, FILE *out, int num_threads,
int compress_level, int sanitize, int walk_trees)
{
struct btrfs_root *root;
struct btrfs_path *path = NULL;
struct metadump_struct metadump;
int ret;
int err = 0;
root = open_ctree(input, 0, 0);
if (!root) {
fprintf(stderr, "Open ctree failed\n");
return -EIO;
}
BUG_ON(root->nodesize != root->leafsize);
ret = metadump_init(&metadump, root, out, num_threads,
compress_level, sanitize);
if (ret) {
fprintf(stderr, "Error initing metadump %d\n", ret);
close_ctree(root);
return ret;
}
ret = add_extent(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump, 0);
if (ret) {
fprintf(stderr, "Error adding metadata %d\n", ret);
err = ret;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
fprintf(stderr, "Out of memory allocing path\n");
err = -ENOMEM;
goto out;
}
if (walk_trees) {
ret = copy_tree_blocks(root, root->fs_info->chunk_root->node,
&metadump, 1);
if (ret) {
err = ret;
goto out;
}
ret = copy_tree_blocks(root, root->fs_info->tree_root->node,
&metadump, 1);
if (ret) {
err = ret;
goto out;
}
} else {
ret = copy_from_extent_tree(&metadump, path);
if (ret) {
err = ret;
goto out;
}
}
ret = copy_log_trees(root, &metadump, path);
if (ret) {
err = ret;
goto out;
}
ret = copy_space_cache(root, &metadump, path);
out:
ret = flush_pending(&metadump, 1);
if (ret) {
if (!err)
err = ret;
fprintf(stderr, "Error flushing pending %d\n", ret);
}
metadump_destroy(&metadump);
btrfs_free_path(path);
ret = close_ctree(root);
return err ? err : ret;
}
static void update_super_old(u8 *buffer)
{
struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
struct btrfs_chunk *chunk;
struct btrfs_disk_key *key;
u32 sectorsize = btrfs_super_sectorsize(super);
u64 flags = btrfs_super_flags(super);
flags |= BTRFS_SUPER_FLAG_METADUMP;
btrfs_set_super_flags(super, flags);
key = (struct btrfs_disk_key *)(super->sys_chunk_array);
chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
sizeof(struct btrfs_disk_key));
btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
btrfs_set_disk_key_offset(key, 0);
btrfs_set_stack_chunk_length(chunk, (u64)-1);
btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
btrfs_set_stack_chunk_io_align(chunk, sectorsize);
btrfs_set_stack_chunk_io_width(chunk, sectorsize);
btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
btrfs_set_stack_chunk_num_stripes(chunk, 1);
btrfs_set_stack_chunk_sub_stripes(chunk, 0);
chunk->stripe.devid = super->dev_item.devid;
btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
csum_block(buffer, 4096);
}
static int update_super(u8 *buffer)
{
struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
struct btrfs_chunk *chunk;
struct btrfs_disk_key *disk_key;
struct btrfs_key key;
u32 new_array_size = 0;
u32 array_size;
u32 cur = 0;
u8 *ptr, *write_ptr;
int old_num_stripes;
write_ptr = ptr = super->sys_chunk_array;
array_size = btrfs_super_sys_array_size(super);
while (cur < array_size) {
disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
new_array_size += sizeof(*disk_key);
memmove(write_ptr, ptr, sizeof(*disk_key));
write_ptr += sizeof(*disk_key);
ptr += sizeof(*disk_key);
cur += sizeof(*disk_key);
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)ptr;
old_num_stripes = btrfs_stack_chunk_num_stripes(chunk);
chunk = (struct btrfs_chunk *)write_ptr;
memmove(write_ptr, ptr, sizeof(*chunk));
btrfs_set_stack_chunk_num_stripes(chunk, 1);
btrfs_set_stack_chunk_sub_stripes(chunk, 0);
btrfs_set_stack_chunk_type(chunk,
BTRFS_BLOCK_GROUP_SYSTEM);
chunk->stripe.devid = super->dev_item.devid;
memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid,
BTRFS_UUID_SIZE);
new_array_size += sizeof(*chunk);
} else {
fprintf(stderr, "Bogus key in the sys chunk array "
"%d\n", key.type);
return -EIO;
}
write_ptr += sizeof(*chunk);
ptr += btrfs_chunk_item_size(old_num_stripes);
cur += btrfs_chunk_item_size(old_num_stripes);
}
btrfs_set_super_sys_array_size(super, new_array_size);
csum_block(buffer, 4096);
return 0;
}
static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size)
{
struct extent_buffer *eb;
eb = malloc(sizeof(struct extent_buffer) + size);
if (!eb)
return NULL;
memset(eb, 0, sizeof(struct extent_buffer) + size);
eb->start = bytenr;
eb->len = size;
return eb;
}
static void truncate_item(struct extent_buffer *eb, int slot, u32 new_size)
{
struct btrfs_item *item;
u32 nritems;
u32 old_size;
u32 old_data_start;
u32 size_diff;
u32 data_end;
int i;
old_size = btrfs_item_size_nr(eb, slot);
if (old_size == new_size)
return;
nritems = btrfs_header_nritems(eb);
data_end = btrfs_item_offset_nr(eb, nritems - 1);
old_data_start = btrfs_item_offset_nr(eb, slot);
size_diff = old_size - new_size;
for (i = slot; i < nritems; i++) {
u32 ioff;
item = btrfs_item_nr(i);
ioff = btrfs_item_offset(eb, item);
btrfs_set_item_offset(eb, item, ioff + size_diff);
}
memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end + size_diff,
btrfs_leaf_data(eb) + data_end,
old_data_start + new_size - data_end);
item = btrfs_item_nr(slot);
btrfs_set_item_size(eb, item, new_size);
}
static int fixup_chunk_tree_block(struct mdrestore_struct *mdres,
struct async_work *async, u8 *buffer,
size_t size)
{
struct extent_buffer *eb;
size_t size_left = size;
u64 bytenr = async->start;
int i;
if (size_left % mdres->leafsize)
return 0;
eb = alloc_dummy_eb(bytenr, mdres->leafsize);
if (!eb)
return -ENOMEM;
while (size_left) {
eb->start = bytenr;
memcpy(eb->data, buffer, mdres->leafsize);
if (btrfs_header_bytenr(eb) != bytenr)
break;
if (memcmp(mdres->fsid,
eb->data + offsetof(struct btrfs_header, fsid),
BTRFS_FSID_SIZE))
break;
if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID)
goto next;
if (btrfs_header_level(eb) != 0)
goto next;
for (i = 0; i < btrfs_header_nritems(eb); i++) {
struct btrfs_chunk chunk;
struct btrfs_key key;
u64 type;
btrfs_item_key_to_cpu(eb, &key, i);
if (key.type != BTRFS_CHUNK_ITEM_KEY)
continue;
truncate_item(eb, i, sizeof(chunk));
read_extent_buffer(eb, &chunk,
btrfs_item_ptr_offset(eb, i),
sizeof(chunk));
/* Zero out the RAID profile */
type = btrfs_stack_chunk_type(&chunk);
type &= (BTRFS_BLOCK_GROUP_DATA |
BTRFS_BLOCK_GROUP_SYSTEM |
BTRFS_BLOCK_GROUP_METADATA |
BTRFS_BLOCK_GROUP_DUP);
btrfs_set_stack_chunk_type(&chunk, type);
btrfs_set_stack_chunk_num_stripes(&chunk, 1);
btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
btrfs_set_stack_stripe_devid(&chunk.stripe, mdres->devid);
memcpy(chunk.stripe.dev_uuid, mdres->uuid,
BTRFS_UUID_SIZE);
write_extent_buffer(eb, &chunk,
btrfs_item_ptr_offset(eb, i),
sizeof(chunk));
}
memcpy(buffer, eb->data, eb->len);
csum_block(buffer, eb->len);
next:
size_left -= mdres->leafsize;
buffer += mdres->leafsize;
bytenr += mdres->leafsize;
}
free(eb);
return 0;
}
static void write_backup_supers(int fd, u8 *buf)
{
struct btrfs_super_block *super = (struct btrfs_super_block *)buf;
struct stat st;
u64 size;
u64 bytenr;
int i;
int ret;
if (fstat(fd, &st)) {
fprintf(stderr, "Couldn't stat restore point, won't be able "
"to write backup supers: %d\n", errno);
return;
}
size = btrfs_device_size(fd, &st);
for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
bytenr = btrfs_sb_offset(i);
if (bytenr + 4096 > size)
break;
btrfs_set_super_bytenr(super, bytenr);
csum_block(buf, 4096);
ret = pwrite64(fd, buf, 4096, bytenr);
if (ret < 4096) {
if (ret < 0)
fprintf(stderr, "Problem writing out backup "
"super block %d, err %d\n", i, errno);
else
fprintf(stderr, "Short write writing out "
"backup super block\n");
break;
}
}
}
static u64 logical_to_physical(struct mdrestore_struct *mdres, u64 logical, u64 *size)
{
struct fs_chunk *fs_chunk;
struct rb_node *entry;
struct fs_chunk search;
u64 offset;
if (logical == BTRFS_SUPER_INFO_OFFSET)
return logical;
search.logical = logical;
entry = tree_search(&mdres->chunk_tree, &search.n, chunk_cmp, 1);
if (!entry) {
if (mdres->in != stdin)
printf("Couldn't find a chunk, using logical\n");
return logical;
}
fs_chunk = rb_entry(entry, struct fs_chunk, n);
if (fs_chunk->logical > logical || fs_chunk->logical + fs_chunk->bytes < logical)
BUG();
offset = search.logical - fs_chunk->logical;
*size = min(*size, fs_chunk->bytes + fs_chunk->logical - logical);
return fs_chunk->physical + offset;
}
static void *restore_worker(void *data)
{
struct mdrestore_struct *mdres = (struct mdrestore_struct *)data;
struct async_work *async;
size_t size;
u8 *buffer;
u8 *outbuf;
int outfd;
int ret;
int compress_size = MAX_PENDING_SIZE * 4;
outfd = fileno(mdres->out);
buffer = malloc(compress_size);
if (!buffer) {
fprintf(stderr, "Error allocing buffer\n");
pthread_mutex_lock(&mdres->mutex);
if (!mdres->error)
mdres->error = -ENOMEM;
pthread_mutex_unlock(&mdres->mutex);
goto out;
}
while (1) {
u64 bytenr;
off_t offset = 0;
int err = 0;
pthread_mutex_lock(&mdres->mutex);
while (!mdres->leafsize || list_empty(&mdres->list)) {
if (mdres->done) {
pthread_mutex_unlock(&mdres->mutex);
goto out;
}
pthread_cond_wait(&mdres->cond, &mdres->mutex);
}
async = list_entry(mdres->list.next, struct async_work, list);
list_del_init(&async->list);
pthread_mutex_unlock(&mdres->mutex);
if (mdres->compress_method == COMPRESS_ZLIB) {
size = compress_size;
ret = uncompress(buffer, (unsigned long *)&size,
async->buffer, async->bufsize);
if (ret != Z_OK) {
fprintf(stderr, "Error decompressing %d\n",
ret);
err = -EIO;
}
outbuf = buffer;
} else {
outbuf = async->buffer;
size = async->bufsize;
}
if (!mdres->multi_devices) {
if (async->start == BTRFS_SUPER_INFO_OFFSET) {
if (mdres->old_restore) {
update_super_old(outbuf);
} else {
ret = update_super(outbuf);
if (ret)
err = ret;
}
} else if (!mdres->old_restore) {
ret = fixup_chunk_tree_block(mdres, async, outbuf, size);
if (ret)
err = ret;
}
}
if (!mdres->fixup_offset) {
while (size) {
u64 chunk_size = size;
if (!mdres->multi_devices)
bytenr = logical_to_physical(mdres,
async->start + offset,
&chunk_size);
else
bytenr = async->start + offset;
ret = pwrite64(outfd, outbuf+offset, chunk_size,
bytenr);
if (ret != chunk_size) {
if (ret < 0) {
fprintf(stderr, "Error writing to "
"device %d\n", errno);
err = errno;
break;
} else {
fprintf(stderr, "Short write\n");
err = -EIO;
break;
}
}
size -= chunk_size;
offset += chunk_size;
}
} else if (async->start != BTRFS_SUPER_INFO_OFFSET) {
ret = write_data_to_disk(mdres->info, outbuf, async->start, size, 0);
if (ret) {
printk("Error write data\n");
exit(1);
}
}
/* backup super blocks are already there at fixup_offset stage */
if (!mdres->multi_devices && async->start == BTRFS_SUPER_INFO_OFFSET)
write_backup_supers(outfd, outbuf);
pthread_mutex_lock(&mdres->mutex);
if (err && !mdres->error)
mdres->error = err;
mdres->num_items--;
pthread_mutex_unlock(&mdres->mutex);
free(async->buffer);
free(async);
}
out:
free(buffer);
pthread_exit(NULL);
}
static void mdrestore_destroy(struct mdrestore_struct *mdres)
{
struct rb_node *n;
int i;
while ((n = rb_first(&mdres->chunk_tree))) {
struct fs_chunk *entry;
entry = rb_entry(n, struct fs_chunk, n);
rb_erase(n, &mdres->chunk_tree);
free(entry);
}
pthread_mutex_lock(&mdres->mutex);
mdres->done = 1;
pthread_cond_broadcast(&mdres->cond);
pthread_mutex_unlock(&mdres->mutex);
for (i = 0; i < mdres->num_threads; i++)
pthread_join(mdres->threads[i], NULL);
pthread_cond_destroy(&mdres->cond);
pthread_mutex_destroy(&mdres->mutex);
free(mdres->threads);
}
static int mdrestore_init(struct mdrestore_struct *mdres,
FILE *in, FILE *out, int old_restore,
int num_threads, int fixup_offset,
struct btrfs_fs_info *info, int multi_devices)
{
int i, ret = 0;
memset(mdres, 0, sizeof(*mdres));
pthread_cond_init(&mdres->cond, NULL);
pthread_mutex_init(&mdres->mutex, NULL);
INIT_LIST_HEAD(&mdres->list);
mdres->in = in;
mdres->out = out;
mdres->old_restore = old_restore;
mdres->chunk_tree.rb_node = NULL;
mdres->fixup_offset = fixup_offset;
mdres->info = info;
mdres->multi_devices = multi_devices;
if (!num_threads)
return 0;
mdres->num_threads = num_threads;
mdres->threads = calloc(num_threads, sizeof(pthread_t));
if (!mdres->threads)
return -ENOMEM;
for (i = 0; i < num_threads; i++) {
ret = pthread_create(mdres->threads + i, NULL, restore_worker,
mdres);
if (ret)
break;
}
if (ret)
mdrestore_destroy(mdres);
return ret;
}
static int fill_mdres_info(struct mdrestore_struct *mdres,
struct async_work *async)
{
struct btrfs_super_block *super;
u8 *buffer = NULL;
u8 *outbuf;
int ret;
/* We've already been initialized */
if (mdres->leafsize)
return 0;
if (mdres->compress_method == COMPRESS_ZLIB) {
size_t size = MAX_PENDING_SIZE * 2;
buffer = malloc(MAX_PENDING_SIZE * 2);
if (!buffer)
return -ENOMEM;
ret = uncompress(buffer, (unsigned long *)&size,
async->buffer, async->bufsize);
if (ret != Z_OK) {
fprintf(stderr, "Error decompressing %d\n", ret);
free(buffer);
return -EIO;
}
outbuf = buffer;
} else {
outbuf = async->buffer;
}
super = (struct btrfs_super_block *)outbuf;
mdres->leafsize = btrfs_super_leafsize(super);
memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
memcpy(mdres->uuid, super->dev_item.uuid,
BTRFS_UUID_SIZE);
mdres->devid = le64_to_cpu(super->dev_item.devid);
free(buffer);
return 0;
}
static int add_cluster(struct meta_cluster *cluster,
struct mdrestore_struct *mdres, u64 *next)
{
struct meta_cluster_item *item;
struct meta_cluster_header *header = &cluster->header;
struct async_work *async;
u64 bytenr;
u32 i, nritems;
int ret;
BUG_ON(mdres->num_items);
mdres->compress_method = header->compress;
bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
nritems = le32_to_cpu(header->nritems);
for (i = 0; i < nritems; i++) {
item = &cluster->items[i];
async = calloc(1, sizeof(*async));
if (!async) {
fprintf(stderr, "Error allocating async\n");
return -ENOMEM;
}
async->start = le64_to_cpu(item->bytenr);
async->bufsize = le32_to_cpu(item->size);
async->buffer = malloc(async->bufsize);
if (!async->buffer) {
fprintf(stderr, "Error allocing async buffer\n");
free(async);
return -ENOMEM;
}
ret = fread(async->buffer, async->bufsize, 1, mdres->in);
if (ret != 1) {
fprintf(stderr, "Error reading buffer %d\n", errno);
free(async->buffer);
free(async);
return -EIO;
}
bytenr += async->bufsize;
pthread_mutex_lock(&mdres->mutex);
if (async->start == BTRFS_SUPER_INFO_OFFSET) {
ret = fill_mdres_info(mdres, async);
if (ret) {
fprintf(stderr, "Error setting up restore\n");
pthread_mutex_unlock(&mdres->mutex);
free(async->buffer);
free(async);
return ret;
}
}
list_add_tail(&async->list, &mdres->list);
mdres->num_items++;
pthread_cond_signal(&mdres->cond);
pthread_mutex_unlock(&mdres->mutex);
}
if (bytenr & BLOCK_MASK) {
char buffer[BLOCK_MASK];
size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
bytenr += size;
ret = fread(buffer, size, 1, mdres->in);
if (ret != 1) {
fprintf(stderr, "Error reading in buffer %d\n", errno);
return -EIO;
}
}
*next = bytenr;
return 0;
}
static int wait_for_worker(struct mdrestore_struct *mdres)
{
int ret = 0;
pthread_mutex_lock(&mdres->mutex);
ret = mdres->error;
while (!ret && mdres->num_items > 0) {
struct timespec ts = {
.tv_sec = 0,
.tv_nsec = 10000000,
};
pthread_mutex_unlock(&mdres->mutex);
nanosleep(&ts, NULL);
pthread_mutex_lock(&mdres->mutex);
ret = mdres->error;
}
pthread_mutex_unlock(&mdres->mutex);
return ret;
}
static int read_chunk_block(struct mdrestore_struct *mdres, u8 *buffer,
u64 bytenr, u64 item_bytenr, u32 bufsize,
u64 cluster_bytenr)
{
struct extent_buffer *eb;
int ret = 0;
int i;
eb = alloc_dummy_eb(bytenr, mdres->leafsize);
if (!eb) {
ret = -ENOMEM;
goto out;
}
while (item_bytenr != bytenr) {
buffer += mdres->leafsize;
item_bytenr += mdres->leafsize;
}
memcpy(eb->data, buffer, mdres->leafsize);
if (btrfs_header_bytenr(eb) != bytenr) {
fprintf(stderr, "Eb bytenr doesn't match found bytenr\n");
ret = -EIO;
goto out;
}
if (memcmp(mdres->fsid, eb->data + offsetof(struct btrfs_header, fsid),
BTRFS_FSID_SIZE)) {
fprintf(stderr, "Fsid doesn't match\n");
ret = -EIO;
goto out;
}
if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID) {
fprintf(stderr, "Does not belong to the chunk tree\n");
ret = -EIO;
goto out;
}
for (i = 0; i < btrfs_header_nritems(eb); i++) {
struct btrfs_chunk chunk;
struct fs_chunk *fs_chunk;
struct btrfs_key key;
if (btrfs_header_level(eb)) {
u64 blockptr = btrfs_node_blockptr(eb, i);
ret = search_for_chunk_blocks(mdres, blockptr,
cluster_bytenr);
if (ret)
break;
continue;
}
/* Yay a leaf! We loves leafs! */
btrfs_item_key_to_cpu(eb, &key, i);
if (key.type != BTRFS_CHUNK_ITEM_KEY)
continue;
fs_chunk = malloc(sizeof(struct fs_chunk));
if (!fs_chunk) {
fprintf(stderr, "Erorr allocating chunk\n");
ret = -ENOMEM;
break;
}
memset(fs_chunk, 0, sizeof(*fs_chunk));
read_extent_buffer(eb, &chunk, btrfs_item_ptr_offset(eb, i),
sizeof(chunk));
fs_chunk->logical = key.offset;
fs_chunk->physical = btrfs_stack_stripe_offset(&chunk.stripe);
fs_chunk->bytes = btrfs_stack_chunk_length(&chunk);
tree_insert(&mdres->chunk_tree, &fs_chunk->n, chunk_cmp);
}
out:
free(eb);
return ret;
}
/* If you have to ask you aren't worthy */
static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
u64 search, u64 cluster_bytenr)
{
struct meta_cluster *cluster;
struct meta_cluster_header *header;
struct meta_cluster_item *item;
u64 current_cluster = cluster_bytenr, bytenr;
u64 item_bytenr;
u32 bufsize, nritems, i;
u32 max_size = MAX_PENDING_SIZE * 2;
u8 *buffer, *tmp = NULL;
int ret = 0;
cluster = malloc(BLOCK_SIZE);
if (!cluster) {
fprintf(stderr, "Error allocating cluster\n");
return -ENOMEM;
}
buffer = malloc(max_size);
if (!buffer) {
fprintf(stderr, "Error allocing buffer\n");
free(cluster);
return -ENOMEM;
}
if (mdres->compress_method == COMPRESS_ZLIB) {
tmp = malloc(max_size);
if (!tmp) {
fprintf(stderr, "Error allocing tmp buffer\n");
free(cluster);
free(buffer);
return -ENOMEM;
}
}
bytenr = current_cluster;
while (1) {
if (fseek(mdres->in, current_cluster, SEEK_SET)) {
fprintf(stderr, "Error seeking: %d\n", errno);
ret = -EIO;
break;
}
ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
if (ret == 0) {
if (cluster_bytenr != 0) {
cluster_bytenr = 0;
current_cluster = 0;
bytenr = 0;
continue;
}
printf("ok this is where we screwed up?\n");
ret = -EIO;
break;
} else if (ret < 0) {
fprintf(stderr, "Error reading image\n");
break;
}
ret = 0;
header = &cluster->header;
if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
le64_to_cpu(header->bytenr) != current_cluster) {
fprintf(stderr, "bad header in metadump image\n");
ret = -EIO;
break;
}
bytenr += BLOCK_SIZE;
nritems = le32_to_cpu(header->nritems);
for (i = 0; i < nritems; i++) {
size_t size;
item = &cluster->items[i];
bufsize = le32_to_cpu(item->size);
item_bytenr = le64_to_cpu(item->bytenr);
if (bufsize > max_size) {
fprintf(stderr, "item %u size %u too big\n",
i, bufsize);
ret = -EIO;
break;
}
if (mdres->compress_method == COMPRESS_ZLIB) {
ret = fread(tmp, bufsize, 1, mdres->in);
if (ret != 1) {
fprintf(stderr, "Error reading: %d\n",
errno);
ret = -EIO;
break;
}
size = max_size;
ret = uncompress(buffer,
(unsigned long *)&size, tmp,
bufsize);
if (ret != Z_OK) {
fprintf(stderr, "Error decompressing "
"%d\n", ret);
ret = -EIO;
break;
}
} else {
ret = fread(buffer, bufsize, 1, mdres->in);
if (ret != 1) {
fprintf(stderr, "Error reading: %d\n",
errno);
ret = -EIO;
break;
}
size = bufsize;
}
ret = 0;
if (item_bytenr <= search &&
item_bytenr + size > search) {
ret = read_chunk_block(mdres, buffer, search,
item_bytenr, size,
current_cluster);
if (!ret)
ret = 1;
break;
}
bytenr += bufsize;
}
if (ret) {
if (ret > 0)
ret = 0;
break;
}
if (bytenr & BLOCK_MASK)
bytenr += BLOCK_SIZE - (bytenr & BLOCK_MASK);
current_cluster = bytenr;
}
free(tmp);
free(buffer);
free(cluster);
return ret;
}
static int build_chunk_tree(struct mdrestore_struct *mdres,
struct meta_cluster *cluster)
{
struct btrfs_super_block *super;
struct meta_cluster_header *header;
struct meta_cluster_item *item = NULL;
u64 chunk_root_bytenr = 0;
u32 i, nritems;
u64 bytenr = 0;
u8 *buffer;
int ret;
/* We can't seek with stdin so don't bother doing this */
if (mdres->in == stdin)
return 0;
ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
if (ret <= 0) {
fprintf(stderr, "Error reading in cluster: %d\n", errno);
return -EIO;
}
ret = 0;
header = &cluster->header;
if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
le64_to_cpu(header->bytenr) != 0) {
fprintf(stderr, "bad header in metadump image\n");
return -EIO;
}
bytenr += BLOCK_SIZE;
mdres->compress_method = header->compress;
nritems = le32_to_cpu(header->nritems);
for (i = 0; i < nritems; i++) {
item = &cluster->items[i];
if (le64_to_cpu(item->bytenr) == BTRFS_SUPER_INFO_OFFSET)
break;
bytenr += le32_to_cpu(item->size);
if (fseek(mdres->in, le32_to_cpu(item->size), SEEK_CUR)) {
fprintf(stderr, "Error seeking: %d\n", errno);
return -EIO;
}
}
if (!item || le64_to_cpu(item->bytenr) != BTRFS_SUPER_INFO_OFFSET) {
fprintf(stderr, "Huh, didn't find the super?\n");
return -EINVAL;
}
buffer = malloc(le32_to_cpu(item->size));
if (!buffer) {
fprintf(stderr, "Error allocing buffer\n");
return -ENOMEM;
}
ret = fread(buffer, le32_to_cpu(item->size), 1, mdres->in);
if (ret != 1) {
fprintf(stderr, "Error reading buffer: %d\n", errno);
free(buffer);
return -EIO;
}
if (mdres->compress_method == COMPRESS_ZLIB) {
size_t size = MAX_PENDING_SIZE * 2;
u8 *tmp;
tmp = malloc(MAX_PENDING_SIZE * 2);
if (!tmp) {
free(buffer);
return -ENOMEM;
}
ret = uncompress(tmp, (unsigned long *)&size,
buffer, le32_to_cpu(item->size));
if (ret != Z_OK) {
fprintf(stderr, "Error decompressing %d\n", ret);
free(buffer);
free(tmp);
return -EIO;
}
free(buffer);
buffer = tmp;
}
super = (struct btrfs_super_block *)buffer;
chunk_root_bytenr = btrfs_super_chunk_root(super);
mdres->leafsize = btrfs_super_leafsize(super);
memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
memcpy(mdres->uuid, super->dev_item.uuid,
BTRFS_UUID_SIZE);
mdres->devid = le64_to_cpu(super->dev_item.devid);
free(buffer);
return search_for_chunk_blocks(mdres, chunk_root_bytenr, 0);
}
static int __restore_metadump(const char *input, FILE *out, int old_restore,
int num_threads, int fixup_offset,
const char *target, int multi_devices)
{
struct meta_cluster *cluster = NULL;
struct meta_cluster_header *header;
struct mdrestore_struct mdrestore;
struct btrfs_fs_info *info = NULL;
u64 bytenr = 0;
FILE *in = NULL;
int ret = 0;
if (!strcmp(input, "-")) {
in = stdin;
} else {
in = fopen(input, "r");
if (!in) {
perror("unable to open metadump image");
return 1;
}
}
/* NOTE: open with write mode */
if (fixup_offset) {
BUG_ON(!target);
info = open_ctree_fs_info(target, 0, 0,
OPEN_CTREE_WRITES |
OPEN_CTREE_RESTORE |
OPEN_CTREE_PARTIAL);
if (!info) {
fprintf(stderr, "%s: open ctree failed\n", __func__);
ret = -EIO;
goto failed_open;
}
}
cluster = malloc(BLOCK_SIZE);
if (!cluster) {
fprintf(stderr, "Error allocating cluster\n");
ret = -ENOMEM;
goto failed_info;
}
ret = mdrestore_init(&mdrestore, in, out, old_restore, num_threads,
fixup_offset, info, multi_devices);
if (ret) {
fprintf(stderr, "Error initing mdrestore %d\n", ret);
goto failed_cluster;
}
if (!multi_devices) {
ret = build_chunk_tree(&mdrestore, cluster);
if (ret)
goto out;
}
if (in != stdin && fseek(in, 0, SEEK_SET)) {
fprintf(stderr, "Error seeking %d\n", errno);
goto out;
}
while (1) {
ret = fread(cluster, BLOCK_SIZE, 1, in);
if (!ret)
break;
header = &cluster->header;
if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
le64_to_cpu(header->bytenr) != bytenr) {
fprintf(stderr, "bad header in metadump image\n");
ret = -EIO;
break;
}
ret = add_cluster(cluster, &mdrestore, &bytenr);
if (ret) {
fprintf(stderr, "Error adding cluster\n");
break;
}
ret = wait_for_worker(&mdrestore);
if (ret) {
fprintf(stderr, "One of the threads errored out %d\n",
ret);
break;
}
}
out:
mdrestore_destroy(&mdrestore);
failed_cluster:
free(cluster);
failed_info:
if (fixup_offset && info)
close_ctree(info->chunk_root);
failed_open:
if (in != stdin)
fclose(in);
return ret;
}
static int restore_metadump(const char *input, FILE *out, int old_restore,
int num_threads, int multi_devices)
{
return __restore_metadump(input, out, old_restore, num_threads, 0, NULL,
multi_devices);
}
static int fixup_metadump(const char *input, FILE *out, int num_threads,
const char *target)
{
return __restore_metadump(input, out, 0, num_threads, 1, target, 1);
}
static int update_disk_super_on_device(struct btrfs_fs_info *info,
const char *other_dev, u64 cur_devid)
{
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_path path;
struct btrfs_dev_item *dev_item;
struct btrfs_super_block *disk_super;
char dev_uuid[BTRFS_UUID_SIZE];
char fs_uuid[BTRFS_UUID_SIZE];
u64 devid, type, io_align, io_width;
u64 sector_size, total_bytes, bytes_used;
char *buf;
int fp;
int ret;
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = cur_devid;
btrfs_init_path(&path);
ret = btrfs_search_slot(NULL, info->chunk_root, &key, &path, 0, 0);
if (ret) {
fprintf(stderr, "search key fails\n");
exit(1);
}
leaf = path.nodes[0];
dev_item = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_dev_item);
devid = btrfs_device_id(leaf, dev_item);
if (devid != cur_devid) {
printk("devid %llu mismatch with %llu\n", devid, cur_devid);
exit(1);
}
type = btrfs_device_type(leaf, dev_item);
io_align = btrfs_device_io_align(leaf, dev_item);
io_width = btrfs_device_io_width(leaf, dev_item);
sector_size = btrfs_device_sector_size(leaf, dev_item);
total_bytes = btrfs_device_total_bytes(leaf, dev_item);
bytes_used = btrfs_device_bytes_used(leaf, dev_item);
read_extent_buffer(leaf, dev_uuid, (unsigned long)btrfs_device_uuid(dev_item), BTRFS_UUID_SIZE);
read_extent_buffer(leaf, fs_uuid, (unsigned long)btrfs_device_fsid(dev_item), BTRFS_UUID_SIZE);
btrfs_release_path(&path);
printk("update disk super on %s devid=%llu\n", other_dev, devid);
/* update other devices' super block */
fp = open(other_dev, O_CREAT | O_RDWR, 0600);
if (fp < 0) {
fprintf(stderr, "could not open %s\n", other_dev);
exit(1);
}
buf = malloc(BTRFS_SUPER_INFO_SIZE);
if (!buf) {
ret = -ENOMEM;
exit(1);
}
memcpy(buf, info->super_copy, BTRFS_SUPER_INFO_SIZE);
disk_super = (struct btrfs_super_block *)buf;
dev_item = &disk_super->dev_item;
btrfs_set_stack_device_type(dev_item, type);
btrfs_set_stack_device_id(dev_item, devid);
btrfs_set_stack_device_total_bytes(dev_item, total_bytes);
btrfs_set_stack_device_bytes_used(dev_item, bytes_used);
btrfs_set_stack_device_io_align(dev_item, io_align);
btrfs_set_stack_device_io_width(dev_item, io_width);
btrfs_set_stack_device_sector_size(dev_item, sector_size);
memcpy(dev_item->uuid, dev_uuid, BTRFS_UUID_SIZE);
memcpy(dev_item->fsid, fs_uuid, BTRFS_UUID_SIZE);
csum_block((u8 *)buf, BTRFS_SUPER_INFO_SIZE);
ret = pwrite64(fp, buf, BTRFS_SUPER_INFO_SIZE, BTRFS_SUPER_INFO_OFFSET);
if (ret != BTRFS_SUPER_INFO_SIZE) {
ret = -EIO;
goto out;
}
write_backup_supers(fp, (u8 *)buf);
out:
free(buf);
close(fp);
return 0;
}
static void print_usage(void)
{
fprintf(stderr, "usage: btrfs-image [options] source target\n");
fprintf(stderr, "\t-r \trestore metadump image\n");
fprintf(stderr, "\t-c value\tcompression level (0 ~ 9)\n");
fprintf(stderr, "\t-t value\tnumber of threads (1 ~ 32)\n");
fprintf(stderr, "\t-o \tdon't mess with the chunk tree when restoring\n");
fprintf(stderr, "\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
fprintf(stderr, "\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
exit(1);
}
int main(int argc, char *argv[])
{
char *source;
char *target;
u64 num_threads = 0;
u64 compress_level = 0;
int create = 1;
int old_restore = 0;
int walk_trees = 0;
int multi_devices = 0;
int ret;
int sanitize = 0;
int dev_cnt = 0;
FILE *out;
while (1) {
int c = getopt(argc, argv, "rc:t:oswm");
if (c < 0)
break;
switch (c) {
case 'r':
create = 0;
break;
case 't':
num_threads = arg_strtou64(optarg);
if (num_threads > 32)
print_usage();
break;
case 'c':
compress_level = arg_strtou64(optarg);
if (compress_level > 9)
print_usage();
break;
case 'o':
old_restore = 1;
break;
case 's':
sanitize++;
break;
case 'w':
walk_trees = 1;
break;
case 'm':
create = 0;
multi_devices = 1;
break;
default:
print_usage();
}
}
if ((old_restore) && create)
print_usage();
argc = argc - optind;
dev_cnt = argc - 1;
if (multi_devices && dev_cnt < 2)
print_usage();
if (!multi_devices && dev_cnt != 1)
print_usage();
source = argv[optind];
target = argv[optind + 1];
if (create && !strcmp(target, "-")) {
out = stdout;
} else {
out = fopen(target, "w+");
if (!out) {
perror("unable to create target file");
exit(1);
}
}
if (num_threads == 0 && compress_level > 0) {
num_threads = sysconf(_SC_NPROCESSORS_ONLN);
if (num_threads <= 0)
num_threads = 1;
}
if (create)
ret = create_metadump(source, out, num_threads,
compress_level, sanitize, walk_trees);
else
ret = restore_metadump(source, out, old_restore, 1,
multi_devices);
if (ret) {
printk("%s failed (%s)\n", (create) ? "create" : "restore",
strerror(errno));
goto out;
}
/* extended support for multiple devices */
if (!create && multi_devices) {
struct btrfs_fs_info *info;
u64 total_devs;
int i;
info = open_ctree_fs_info(target, 0, 0,
OPEN_CTREE_PARTIAL |
OPEN_CTREE_RESTORE);
if (!info) {
int e = errno;
fprintf(stderr, "unable to open %s error = %s\n",
target, strerror(e));
return 1;
}
total_devs = btrfs_super_num_devices(info->super_copy);
if (total_devs != dev_cnt) {
printk("it needs %llu devices but has only %d\n",
total_devs, dev_cnt);
close_ctree(info->chunk_root);
goto out;
}
/* update super block on other disks */
for (i = 2; i <= dev_cnt; i++) {
ret = update_disk_super_on_device(info,
argv[optind + i], (u64)i);
if (ret) {
printk("update disk super failed devid=%d (error=%d)\n",
i, ret);
close_ctree(info->chunk_root);
exit(1);
}
}
close_ctree(info->chunk_root);
/* fix metadata block to map correct chunk */
ret = fixup_metadump(source, out, 1, target);
if (ret) {
fprintf(stderr, "fix metadump failed (error=%d)\n",
ret);
exit(1);
}
}
out:
if (out == stdout)
fflush(out);
else
fclose(out);
return !!ret;
}
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