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btrfs-progs/cmds/inspect-dump-tree.c

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/*
* 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 <uuid/uuid.h>
#include <getopt.h>
#include <fcntl.h>
#include "kerncompat.h"
#include "kernel-lib/radix-tree.h"
#include "kernel-shared/ctree.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/print-tree.h"
#include "kernel-shared/transaction.h"
#include "kernel-shared/volumes.h"
#include "cmds/commands.h"
#include "common/utils.h"
#include "common/help.h"
#include "common/device-scan.h"
static void print_extents(struct extent_buffer *eb)
{
struct btrfs_fs_info *fs_info = eb->fs_info;
struct extent_buffer *next;
int i;
u32 nr;
if (!eb)
return;
if (btrfs_is_leaf(eb)) {
btrfs_print_leaf(eb);
return;
}
nr = btrfs_header_nritems(eb);
for (i = 0; i < nr; i++) {
next = read_tree_block(fs_info,
btrfs_node_blockptr(eb, i),
btrfs_node_ptr_generation(eb, i));
if (!extent_buffer_uptodate(next))
continue;
if (btrfs_is_leaf(next) && btrfs_header_level(eb) != 1) {
warning(
"eb corrupted: item %d eb level %d next level %d, skipping the rest",
i, btrfs_header_level(next),
btrfs_header_level(eb));
goto out;
}
if (btrfs_header_level(next) != btrfs_header_level(eb) - 1) {
warning(
"eb corrupted: item %d eb level %d next level %d, skipping the rest",
i, btrfs_header_level(next),
btrfs_header_level(eb));
goto out;
}
print_extents(next);
free_extent_buffer(next);
}
return;
out:
free_extent_buffer(next);
}
static void print_old_roots(struct btrfs_super_block *super)
{
struct btrfs_root_backup *backup;
int i;
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
backup = super->super_roots + i;
printf("btrfs root backup slot %d\n", i);
printf("\ttree root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_tree_root_gen(backup),
(unsigned long long)btrfs_backup_tree_root(backup));
printf("\t\textent root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_extent_root_gen(backup),
(unsigned long long)btrfs_backup_extent_root(backup));
printf("\t\tchunk root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_chunk_root_gen(backup),
(unsigned long long)btrfs_backup_chunk_root(backup));
printf("\t\tdevice root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_dev_root_gen(backup),
(unsigned long long)btrfs_backup_dev_root(backup));
printf("\t\tcsum root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_csum_root_gen(backup),
(unsigned long long)btrfs_backup_csum_root(backup));
printf("\t\tfs root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_fs_root_gen(backup),
(unsigned long long)btrfs_backup_fs_root(backup));
printf("\t\t%llu used %llu total %llu devices\n",
(unsigned long long)btrfs_backup_bytes_used(backup),
(unsigned long long)btrfs_backup_total_bytes(backup),
(unsigned long long)btrfs_backup_num_devices(backup));
}
}
/*
* Convert a tree name from various forms to the numerical id if possible
* Accepted forms:
* - case does not matter
* - same as the key name, BTRFS_ROOT_TREE_OBJECTID
* - dtto shortened, BTRFS_ROOT_TREE
* - dtto without prefix, ROOT_TREE
* - common name, ROOT, CHUNK, EXTENT, ...
* - dtto alias, DEVICE for DEV, CHECKSUM for CSUM
*
* Returns 0 if the tree id was not recognized.
*/
static u64 treeid_from_string(const char *str, const char **end)
{
int match = 0;
int i;
u64 id;
static struct treename {
const char *name;
u64 id;
} tn[] = {
{ "ROOT", BTRFS_ROOT_TREE_OBJECTID },
{ "EXTENT", BTRFS_EXTENT_TREE_OBJECTID },
{ "CHUNK", BTRFS_CHUNK_TREE_OBJECTID },
{ "DEVICE", BTRFS_DEV_TREE_OBJECTID },
{ "DEV", BTRFS_DEV_TREE_OBJECTID },
{ "FS", BTRFS_FS_TREE_OBJECTID },
{ "CSUM", BTRFS_CSUM_TREE_OBJECTID },
{ "CHECKSUM", BTRFS_CSUM_TREE_OBJECTID },
{ "QUOTA", BTRFS_QUOTA_TREE_OBJECTID },
{ "UUID", BTRFS_UUID_TREE_OBJECTID },
{ "FREE_SPACE", BTRFS_FREE_SPACE_TREE_OBJECTID },
{ "TREE_LOG_FIXUP", BTRFS_TREE_LOG_FIXUP_OBJECTID },
{ "TREE_LOG", BTRFS_TREE_LOG_OBJECTID },
{ "TREE_RELOC", BTRFS_TREE_RELOC_OBJECTID },
{ "DATA_RELOC", BTRFS_DATA_RELOC_TREE_OBJECTID }
};
if (strncasecmp("BTRFS_", str, strlen("BTRFS_")) == 0)
str += strlen("BTRFS_");
for (i = 0; i < ARRAY_SIZE(tn); i++) {
int len = strlen(tn[i].name);
if (strncasecmp(tn[i].name, str, len) == 0) {
id = tn[i].id;
match = 1;
str += len;
break;
}
}
if (!match)
return 0;
if (strncasecmp("_TREE", str, strlen("_TREE")) == 0)
str += strlen("_TREE");
if (strncasecmp("_OBJECTID", str, strlen("_OBJECTID")) == 0)
str += strlen("_OBJECTID");
*end = str;
return id;
}
static const char * const cmd_inspect_dump_tree_usage[] = {
"btrfs inspect-internal dump-tree [options] <device> [<device> ..]",
"Dump tree structures from a given device",
"Dump tree structures from a given device in textual form, expand keys to human",
"readable equivalents where possible.",
"Note: contains file names, consider that if you're asked to send the dump",
"for analysis.",
"",
"-e|--extents print only extent info: extent and device trees",
"-d|--device print only device info: tree root, chunk and device trees",
"-r|--roots print only short root node info",
"-R|--backups same as --roots plus print backup root info",
"-u|--uuid print only the uuid tree",
"-b|--block <block_num> print info from the specified block only",
" can be specified multiple times",
"-t|--tree <tree_id> print only tree with the given id (string or number)",
"--follow use with -b, to show all children tree blocks of <block_num>",
"--noscan do not scan the devices from the filesystem, use only the listed ones",
"--bfs breadth-first traversal of the trees, print nodes, then leaves (default)",
"--dfs depth-first traversal of the trees",
"--hide-names hide filenames/subvolume/xattrs and other name references",
NULL
};
/*
* Helper function to record all tree block bytenr so we don't need to put
* all code into deep indent.
*
* Return >0 if we hit a duplicated bytenr (already recorded)
* Return 0 if nothing went wrong
* Return <0 if error happens (ENOMEM)
*
* For != 0 return value, all warning/error will be outputted by this function.
*/
static int dump_add_tree_block(struct cache_tree *tree, u64 bytenr)
{
int ret;
/*
* We don't really care about the size and we don't have
* nodesize before we open the fs, so just use 1 as size here.
*/
ret = add_cache_extent(tree, bytenr, 1);
if (ret == -EEXIST) {
warning("tree block bytenr %llu is duplicated", bytenr);
return 1;
}
if (ret < 0) {
error("failed to record tree block bytenr %llu: %d(%s)",
bytenr, ret, strerror(-ret));
return ret;
}
return ret;
}
/*
* Print all tree blocks recorded.
* All tree block bytenr record will also be freed in this function.
*
* Return 0 if nothing wrong happened for *each* tree blocks
* Return <0 if anything wrong happened, and return value will be the last
* error.
*/
static int dump_print_tree_blocks(struct btrfs_fs_info *fs_info,
struct cache_tree *tree, bool follow)
{
struct cache_extent *ce;
struct extent_buffer *eb;
u64 bytenr;
int ret = 0;
ce = first_cache_extent(tree);
while (ce) {
bytenr = ce->start;
/*
* Please note that here we can't check it against nodesize,
* as it's possible a chunk is just aligned to sectorsize but
* not aligned to nodesize.
*/
if (!IS_ALIGNED(bytenr, fs_info->sectorsize)) {
error(
"tree block bytenr %llu is not aligned to sectorsize %u",
bytenr, fs_info->sectorsize);
ret = -EINVAL;
goto next;
}
eb = read_tree_block(fs_info, bytenr, 0);
if (!extent_buffer_uptodate(eb)) {
error("failed to read tree block %llu", bytenr);
ret = -EIO;
goto next;
}
btrfs_print_tree(eb, follow, BTRFS_PRINT_TREE_DEFAULT);
free_extent_buffer(eb);
next:
remove_cache_extent(tree, ce);
free(ce);
ce = first_cache_extent(tree);
}
return ret;
}
static int cmd_inspect_dump_tree(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_root *root;
struct btrfs_fs_info *info;
struct btrfs_path path;
struct btrfs_key key;
struct btrfs_root_item ri;
struct extent_buffer *leaf;
struct btrfs_disk_key disk_key;
struct btrfs_key found_key;
struct cache_tree block_root; /* for multiple --block parameters */
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
int ret = 0;
int slot;
int extent_only = 0;
int device_only = 0;
int uuid_tree_only = 0;
int roots_only = 0;
int root_backups = 0;
int traverse = BTRFS_PRINT_TREE_DEFAULT;
int dev_optind;
unsigned open_ctree_flags;
u64 block_bytenr;
struct btrfs_root *tree_root_scan;
u64 tree_id = 0;
bool follow = false;
/*
* For debug-tree, we care nothing about extent tree (it's just backref
* and usage accounting, only makes sense for RW operations).
* Use NO_BLOCK_GROUPS here could also speedup open_ctree() and allow us
* to inspect fs with corrupted extent tree blocks, and show as many good
* tree blocks as possible.
*/
open_ctree_flags = OPEN_CTREE_PARTIAL | OPEN_CTREE_NO_BLOCK_GROUPS;
cache_tree_init(&block_root);
optind = 0;
while (1) {
int c;
enum { GETOPT_VAL_FOLLOW = 256, GETOPT_VAL_DFS, GETOPT_VAL_BFS,
GETOPT_VAL_NOSCAN, GETOPT_VAL_HIDE_NAMES };
static const struct option long_options[] = {
{ "extents", no_argument, NULL, 'e'},
{ "device", no_argument, NULL, 'd'},
{ "roots", no_argument, NULL, 'r'},
{ "backups", no_argument, NULL, 'R'},
{ "uuid", no_argument, NULL, 'u'},
{ "block", required_argument, NULL, 'b'},
{ "tree", required_argument, NULL, 't'},
{ "follow", no_argument, NULL, GETOPT_VAL_FOLLOW },
{ "bfs", no_argument, NULL, GETOPT_VAL_BFS },
{ "dfs", no_argument, NULL, GETOPT_VAL_DFS },
{ "noscan", no_argument, NULL, GETOPT_VAL_NOSCAN },
{ "hide-names", no_argument, NULL, GETOPT_VAL_HIDE_NAMES },
{ NULL, 0, NULL, 0 }
};
c = getopt_long(argc, argv, "deb:rRut:", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'e':
extent_only = 1;
break;
case 'd':
device_only = 1;
break;
case 'r':
roots_only = 1;
break;
case 'u':
uuid_tree_only = 1;
break;
case 'R':
roots_only = 1;
root_backups = 1;
break;
case 'b':
/*
* If only showing one block, no need to fill roots
* other than chunk root
*/
open_ctree_flags |= __OPEN_CTREE_RETURN_CHUNK_ROOT;
block_bytenr = arg_strtou64(optarg);
ret = dump_add_tree_block(&block_root, block_bytenr);
if (ret < 0)
goto out;
break;
case 't': {
const char *end = NULL;
if (string_is_numerical(optarg))
tree_id = arg_strtou64(optarg);
else
tree_id = treeid_from_string(optarg, &end);
if (!tree_id) {
error("unrecognized tree id: %s",
optarg);
exit(1);
}
if (end && *end) {
error("unexpected tree id suffix of '%s': %s",
optarg, end);
exit(1);
}
break;
}
case GETOPT_VAL_FOLLOW:
follow = true;
break;
case GETOPT_VAL_DFS:
traverse = BTRFS_PRINT_TREE_DFS;
break;
case GETOPT_VAL_BFS:
traverse = BTRFS_PRINT_TREE_BFS;
break;
case GETOPT_VAL_NOSCAN:
open_ctree_flags |= OPEN_CTREE_NO_DEVICES;
break;
case GETOPT_VAL_HIDE_NAMES:
open_ctree_flags |= OPEN_CTREE_HIDE_NAMES;
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_min(argc - optind, 1))
return 1;
dev_optind = optind;
while (dev_optind < argc) {
int fd;
struct btrfs_fs_devices *fs_devices;
u64 num_devices;
ret = check_arg_type(argv[optind]);
if (ret != BTRFS_ARG_BLKDEV && ret != BTRFS_ARG_REG) {
if (ret < 0) {
errno = -ret;
error("invalid argument %s: %m", argv[dev_optind]);
} else {
error("not a block device or regular file: %s",
argv[dev_optind]);
}
}
fd = open(argv[dev_optind], O_RDONLY);
if (fd < 0) {
error("cannot open %s: %m", argv[dev_optind]);
return -EINVAL;
}
ret = btrfs_scan_one_device(fd, argv[dev_optind], &fs_devices,
&num_devices,
BTRFS_SUPER_INFO_OFFSET,
SBREAD_DEFAULT);
close(fd);
if (ret < 0) {
errno = -ret;
error("device scan %s: %m", argv[dev_optind]);
return ret;
}
dev_optind++;
}
printf("%s\n", PACKAGE_STRING);
info = open_ctree_fs_info(argv[optind], 0, 0, 0, open_ctree_flags);
if (!info) {
error("unable to open %s", argv[optind]);
goto out;
}
if (!cache_tree_empty(&block_root)) {
root = info->chunk_root;
ret = dump_print_tree_blocks(info, &block_root, follow);
goto close_root;
}
root = info->fs_root;
if (!root) {
error("unable to open %s", argv[optind]);
goto out;
}
if (!(extent_only || uuid_tree_only || tree_id)) {
if (roots_only) {
printf("root tree: %llu level %d\n",
(unsigned long long)info->tree_root->node->start,
btrfs_header_level(info->tree_root->node));
printf("chunk tree: %llu level %d\n",
(unsigned long long)info->chunk_root->node->start,
btrfs_header_level(info->chunk_root->node));
if (info->log_root_tree)
printf("log root tree: %llu level %d\n",
info->log_root_tree->node->start,
btrfs_header_level(
info->log_root_tree->node));
} else {
if (info->tree_root->node) {
printf("root tree\n");
btrfs_print_tree(info->tree_root->node, true,
traverse);
}
if (info->chunk_root->node) {
printf("chunk tree\n");
btrfs_print_tree(info->chunk_root->node, true,
traverse);
}
if (info->log_root_tree) {
printf("log root tree\n");
btrfs_print_tree(info->log_root_tree->node,
true, traverse);
}
}
}
tree_root_scan = info->tree_root;
btrfs_init_path(&path);
again:
if (!extent_buffer_uptodate(tree_root_scan->node))
goto no_node;
/*
* Tree's that are not pointed by the tree of tree roots
*/
if (tree_id && tree_id == BTRFS_ROOT_TREE_OBJECTID) {
if (!info->tree_root->node) {
error("cannot print root tree, invalid pointer");
goto close_root;
}
printf("root tree\n");
btrfs_print_tree(info->tree_root->node, true, traverse);
goto close_root;
}
if (tree_id && tree_id == BTRFS_CHUNK_TREE_OBJECTID) {
if (!info->chunk_root->node) {
error("cannot print chunk tree, invalid pointer");
goto close_root;
}
printf("chunk tree\n");
btrfs_print_tree(info->chunk_root->node, true, traverse);
goto close_root;
}
if (tree_id && tree_id == BTRFS_TREE_LOG_OBJECTID) {
if (!info->log_root_tree) {
error("cannot print log root tree, invalid pointer");
goto close_root;
}
printf("log root tree\n");
btrfs_print_tree(info->log_root_tree->node, true, traverse);
goto close_root;
}
key.offset = 0;
key.objectid = 0;
key.type = BTRFS_ROOT_ITEM_KEY;
ret = btrfs_search_slot(NULL, tree_root_scan, &key, &path, 0, 0);
if (ret < 0) {
errno = -ret;
error("cannot read ROOT_ITEM from tree %llu: %m",
(unsigned long long)tree_root_scan->root_key.objectid);
goto close_root;
}
while (1) {
leaf = path.nodes[0];
slot = path.slots[0];
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(tree_root_scan, &path);
if (ret != 0)
break;
leaf = path.nodes[0];
slot = path.slots[0];
}
btrfs_item_key(leaf, &disk_key, path.slots[0]);
btrfs_disk_key_to_cpu(&found_key, &disk_key);
if (found_key.type == BTRFS_ROOT_ITEM_KEY) {
unsigned long offset;
struct extent_buffer *buf;
int skip = extent_only | device_only | uuid_tree_only;
offset = btrfs_item_ptr_offset(leaf, slot);
read_extent_buffer(leaf, &ri, offset, sizeof(ri));
buf = read_tree_block(info, btrfs_root_bytenr(&ri), 0);
if (!extent_buffer_uptodate(buf))
goto next;
if (tree_id && found_key.objectid != tree_id) {
free_extent_buffer(buf);
goto next;
}
switch (found_key.objectid) {
case BTRFS_ROOT_TREE_OBJECTID:
if (!skip)
printf("root");
break;
case BTRFS_EXTENT_TREE_OBJECTID:
if (!device_only && !uuid_tree_only)
skip = 0;
if (!skip)
printf("extent");
break;
case BTRFS_CHUNK_TREE_OBJECTID:
if (!skip) {
printf("chunk");
}
break;
case BTRFS_DEV_TREE_OBJECTID:
if (!uuid_tree_only)
skip = 0;
if (!skip)
printf("device");
break;
case BTRFS_FS_TREE_OBJECTID:
if (!skip) {
printf("fs");
}
break;
case BTRFS_ROOT_TREE_DIR_OBJECTID:
skip = 0;
printf("directory");
break;
case BTRFS_CSUM_TREE_OBJECTID:
if (!skip) {
printf("checksum");
}
break;
case BTRFS_ORPHAN_OBJECTID:
if (!skip) {
printf("orphan");
}
break;
case BTRFS_TREE_LOG_OBJECTID:
if (!skip) {
printf("log");
}
break;
case BTRFS_TREE_LOG_FIXUP_OBJECTID:
if (!skip) {
printf("log fixup");
}
break;
case BTRFS_TREE_RELOC_OBJECTID:
if (!skip) {
printf("reloc");
}
break;
case BTRFS_DATA_RELOC_TREE_OBJECTID:
if (!skip) {
printf("data reloc");
}
break;
case BTRFS_EXTENT_CSUM_OBJECTID:
if (!skip) {
printf("extent checksum");
}
break;
case BTRFS_QUOTA_TREE_OBJECTID:
if (!skip) {
printf("quota");
}
break;
case BTRFS_UUID_TREE_OBJECTID:
if (!extent_only && !device_only)
skip = 0;
if (!skip)
printf("uuid");
break;
case BTRFS_FREE_SPACE_TREE_OBJECTID:
if (!skip)
printf("free space");
break;
case BTRFS_MULTIPLE_OBJECTIDS:
if (!skip) {
printf("multiple");
}
break;
default:
if (!skip) {
printf("file");
}
}
if (extent_only && !skip) {
printf(" tree ");
btrfs_print_key(&disk_key);
printf("\n");
print_extents(buf);
} else if (!skip) {
printf(" tree ");
btrfs_print_key(&disk_key);
if (roots_only) {
printf(" %llu level %d\n",
(unsigned long long)buf->start,
btrfs_header_level(buf));
} else {
printf(" \n");
btrfs_print_tree(buf, true, traverse);
}
}
free_extent_buffer(buf);
}
next:
path.slots[0]++;
}
no_node:
btrfs_release_path(&path);
if (tree_root_scan == info->tree_root && info->log_root_tree) {
tree_root_scan = info->log_root_tree;
goto again;
}
if (extent_only || device_only || uuid_tree_only)
goto close_root;
if (root_backups)
print_old_roots(info->super_copy);
printf("total bytes %llu\n",
(unsigned long long)btrfs_super_total_bytes(info->super_copy));
printf("bytes used %llu\n",
(unsigned long long)btrfs_super_bytes_used(info->super_copy));
uuidbuf[BTRFS_UUID_UNPARSED_SIZE - 1] = '\0';
uuid_unparse(info->super_copy->fsid, uuidbuf);
printf("uuid %s\n", uuidbuf);
close_root:
ret = close_ctree(root);
out:
return !!ret;
}
DEFINE_SIMPLE_COMMAND(inspect_dump_tree, "dump-tree");
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