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btrfs-corrupt-block.c
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/*
* Copyright (C) 2009 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 "kerncompat.h"
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <limits.h>
#include <errno.h>
#include <string.h>
#include "kernel-shared/ctree.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/transaction.h"
#include "kernel-shared/extent_io.h"
#include "common/utils.h"
#include "common/help.h"
#include "common/extent-cache.h"
#include "common/messages.h"
#include "common/string-utils.h"
#include "cmds/commands.h"
#define FIELD_BUF_LEN 80
static int debug_corrupt_block(struct extent_buffer *eb,
struct btrfs_root *root, u64 bytenr, u32 blocksize, u64 copy)
{
int ret;
int num_copies;
int mirror_num = 1;
while (1) {
if (!copy || mirror_num == copy) {
u64 read_len = eb->len;
ret = read_data_from_disk(eb->fs_info, eb->data,
eb->start, &read_len,
mirror_num);
if (read_len < eb->len)
ret = -EIO;
if (ret < 0) {
errno = -ret;
error("cannot read eb bytenr %llu: %m", eb->start);
return ret;
}
printf("corrupting %llu copy %d\n", eb->start,
mirror_num);
memset(eb->data, 0, eb->len);
ret = write_and_map_eb(eb->fs_info, eb);
if (ret < 0) {
errno = -ret;
error("cannot write eb bytenr %llu: %m", eb->start);
return ret;
}
}
num_copies = btrfs_num_copies(root->fs_info, eb->start,
eb->len);
if (num_copies == 1)
break;
mirror_num++;
if (mirror_num > num_copies)
break;
}
return 0;
}
static const char * const corrupt_block_usage[] = {
"btrfs-corrupt-block [options] device",
"Corrupt data structures on a btrfs filesystem. For testing only!",
"",
OPTLINE("-l|--logical EXTENT", "logical extent to be corrupted"),
OPTLINE("-c|--copy COPY", "copy of the extent to be corrupted (usually 1 or 2, default: 0)"),
OPTLINE("-b|--bytes COUNT", "number of bytes to be corrupted"),
OPTLINE("-e|--extent-record", "corrupt the extent"),
OPTLINE("-E|--extent-tree", "corrupt the whole extent tree"),
OPTLINE("-u|--chunk-record", "corrupt the given chunk"),
OPTLINE("-U|--chunk-tree", "corrupt the whole whole chunk tree"),
OPTLINE("-i|--inode INODE", "inode number to corrupt (must also specify the field to corrupt)"),
OPTLINE("-x|--file-extent EXTENT",
"file extent item to corrupt (must also specify -i for the inode and -f for the field to corrupt)"),
OPTLINE("-m|--metadata-block BLOCK",
"metadata block to corrupt (must also specify -f for the field to corrupt)"),
OPTLINE("-k|--keys"," corrupt block keys (set by --logical)"),
OPTLINE("-K|--key <u64,u8,u64>",
"corrupt the given key (must also specify -f for the field and optionally -r for the root)"),
OPTLINE("-f|--field FIELD", "field name in the item to corrupt"),
OPTLINE("-I|--item", "corrupt an item corresponding to the passed key triplet "
"(must also specify the field, or a (bytes, offset, value) tuple to corrupt and root for the item)"),
OPTLINE("-D|--dir-item",
"corrupt a dir item corresponding to the passed key triplet, must also specify a field"),
OPTLINE("-d|--delete", "delete item corresponding to passed key triplet"),
OPTLINE("-r|--root", "operate on this root"),
OPTLINE("-C|--csum BYTENR", "delete a csum for the specified bytenr. When used "
"with -b it'll delete that many bytes, otherwise it's just sectorsize"),
OPTLINE("--block-group OFFSET", "corrupt the given block group"),
OPTLINE("--value VALUE", "value to use for corrupting item data"),
OPTLINE("--offset OFFSET", "offset to use for corrupting item data"),
NULL
};
static const struct cmd_struct corrupt_block_cmd = {
.usagestr = corrupt_block_usage
};
static void corrupt_keys(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct extent_buffer *eb)
{
int slot;
int bad_slot;
int nr;
struct btrfs_disk_key bad_key;;
nr = btrfs_header_nritems(eb);
if (nr == 0)
return;
slot = rand_range(nr);
bad_slot = rand_range(nr);
if (bad_slot == slot)
return;
fprintf(stderr,
"corrupting keys in block %llu slot %d swapping with %d\n",
eb->start, slot, bad_slot);
if (btrfs_header_level(eb) == 0) {
btrfs_item_key(eb, &bad_key, bad_slot);
btrfs_set_item_key(eb, &bad_key, slot);
} else {
btrfs_node_key(eb, &bad_key, bad_slot);
btrfs_set_node_key(eb, &bad_key, slot);
}
btrfs_mark_buffer_dirty(eb);
if (!trans) {
u16 csum_size = fs_info->csum_size;
u16 csum_type = fs_info->csum_type;
csum_tree_block_size(eb, csum_size, 0, csum_type);
write_and_map_eb(eb->fs_info, eb);
}
}
static int corrupt_keys_in_block(struct btrfs_fs_info *fs_info, u64 bytenr)
{
struct extent_buffer *eb;
eb = read_tree_block(fs_info, bytenr, 0);
if (!extent_buffer_uptodate(eb))
return -EIO;;
corrupt_keys(NULL, fs_info, eb);
free_extent_buffer(eb);
return 0;
}
static int corrupt_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr)
{
struct btrfs_root *extent_root;
struct btrfs_key key;
struct extent_buffer *leaf;
u32 item_size;
unsigned long ptr;
struct btrfs_path *path;
int ret;
int slot;
int should_del = rand_range(3);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = bytenr;
key.type = (u8)-1;
key.offset = (u64)-1;
extent_root = btrfs_extent_root(trans->fs_info, bytenr);
while(1) {
ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
if (ret < 0)
break;
if (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, &key, slot);
if (key.objectid != bytenr)
break;
if (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 &&
key.type != BTRFS_EXTENT_REF_V0_KEY &&
key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
key.type != BTRFS_SHARED_DATA_REF_KEY)
goto next;
if (should_del) {
fprintf(stderr,
"deleting extent record: key %llu %u %llu\n",
key.objectid, key.type, key.offset);
if (key.type == BTRFS_EXTENT_ITEM_KEY) {
/* make sure this extent doesn't get
* reused for other purposes */
btrfs_pin_extent(root->fs_info,
key.objectid, key.offset);
}
btrfs_del_item(trans, root, path);
} else {
fprintf(stderr,
"corrupting extent record: key %llu %u %llu\n",
key.objectid, key.type, key.offset);
ptr = btrfs_item_ptr_offset(leaf, slot);
item_size = btrfs_item_size(leaf, slot);
memset_extent_buffer(leaf, 0, ptr, item_size);
btrfs_mark_buffer_dirty(leaf);
}
next:
btrfs_release_path(path);
if (key.offset > 0)
key.offset--;
if (key.offset == 0)
break;
}
btrfs_free_path(path);
return 0;
}
static void btrfs_corrupt_extent_leaf(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *eb)
{
u32 nr = btrfs_header_nritems(eb);
u32 victim = rand_range(nr);
u64 objectid;
struct btrfs_key key;
btrfs_item_key_to_cpu(eb, &key, victim);
objectid = key.objectid;
corrupt_extent(trans, root, objectid);
}
static void btrfs_corrupt_extent_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *eb)
{
struct btrfs_fs_info *fs_info = root->fs_info;
int i;
if (!eb)
return;
if (btrfs_is_leaf(eb)) {
btrfs_corrupt_extent_leaf(trans, root, eb);
return;
}
if (btrfs_header_level(eb) == 1 && eb != root->node) {
if (rand_range(5))
return;
}
for (i = 0; i < btrfs_header_nritems(eb); i++) {
struct extent_buffer *next;
next = read_tree_block(fs_info, btrfs_node_blockptr(eb, i),
btrfs_node_ptr_generation(eb, i));
if (!extent_buffer_uptodate(next))
continue;
btrfs_corrupt_extent_tree(trans, root, next);
free_extent_buffer(next);
}
}
enum btrfs_inode_field {
BTRFS_INODE_FIELD_ISIZE,
BTRFS_INODE_FIELD_NBYTES,
BTRFS_INODE_FIELD_NLINK,
BTRFS_INODE_FIELD_GENERATION,
BTRFS_INODE_FIELD_TRANSID,
BTRFS_INODE_FIELD_BLOCK_GROUP,
BTRFS_INODE_FIELD_MODE,
BTRFS_INODE_FIELD_UID,
BTRFS_INODE_FIELD_GID,
BTRFS_INODE_FIELD_BAD,
};
enum btrfs_file_extent_field {
BTRFS_FILE_EXTENT_DISK_BYTENR,
BTRFS_FILE_EXTENT_TYPE,
BTRFS_FILE_EXTENT_BAD,
};
enum btrfs_dir_item_field {
BTRFS_DIR_ITEM_NAME,
BTRFS_DIR_ITEM_LOCATION_OBJECTID,
BTRFS_DIR_ITEM_BAD,
};
enum btrfs_metadata_block_field {
BTRFS_METADATA_BLOCK_GENERATION,
BTRFS_METADATA_BLOCK_SHIFT_ITEMS,
BTRFS_METADATA_BLOCK_BAD,
};
enum btrfs_item_field {
BTRFS_ITEM_OFFSET,
BTRFS_ITEM_BAD,
};
enum btrfs_key_field {
BTRFS_KEY_OBJECTID,
BTRFS_KEY_TYPE,
BTRFS_KEY_OFFSET,
BTRFS_KEY_BAD,
};
enum btrfs_block_group_field {
BTRFS_BLOCK_GROUP_ITEM_USED,
BTRFS_BLOCK_GROUP_ITEM_FLAGS,
BTRFS_BLOCK_GROUP_ITEM_CHUNK_OBJECTID,
BTRFS_BLOCK_GROUP_ITEM_BAD,
};
static enum btrfs_block_group_field convert_block_group_field(char *field)
{
if (!strncmp(field, "used", FIELD_BUF_LEN))
return BTRFS_BLOCK_GROUP_ITEM_USED;
if (!strncmp(field, "flags", FIELD_BUF_LEN))
return BTRFS_BLOCK_GROUP_ITEM_FLAGS;
if (!strncmp(field, "chunk_objectid", FIELD_BUF_LEN))
return BTRFS_BLOCK_GROUP_ITEM_CHUNK_OBJECTID;
return BTRFS_BLOCK_GROUP_ITEM_BAD;
}
static enum btrfs_inode_field convert_inode_field(char *field)
{
if (!strncmp(field, "isize", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_ISIZE;
if (!strncmp(field, "nbytes", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_NBYTES;
if (!strncmp(field, "nlink", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_NLINK;
if (!strncmp(field, "generation", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_GENERATION;
if (!strncmp(field, "transid", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_TRANSID;
if (!strncmp(field, "block_group", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_BLOCK_GROUP;
if (!strncmp(field, "mode", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_MODE;
if (!strncmp(field, "uid", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_UID;
if (!strncmp(field, "gid", FIELD_BUF_LEN))
return BTRFS_INODE_FIELD_GID;
return BTRFS_INODE_FIELD_BAD;
}
static enum btrfs_file_extent_field convert_file_extent_field(char *field)
{
if (!strncmp(field, "disk_bytenr", FIELD_BUF_LEN))
return BTRFS_FILE_EXTENT_DISK_BYTENR;
if (!strncmp(field, "type", FIELD_BUF_LEN))
return BTRFS_FILE_EXTENT_TYPE;
return BTRFS_FILE_EXTENT_BAD;
}
static enum btrfs_metadata_block_field
convert_metadata_block_field(char *field)
{
if (!strncmp(field, "generation", FIELD_BUF_LEN))
return BTRFS_METADATA_BLOCK_GENERATION;
if (!strncmp(field, "shift_items", FIELD_BUF_LEN))
return BTRFS_METADATA_BLOCK_SHIFT_ITEMS;
return BTRFS_METADATA_BLOCK_BAD;
}
static enum btrfs_key_field convert_key_field(char *field)
{
if (!strncmp(field, "objectid", FIELD_BUF_LEN))
return BTRFS_KEY_OBJECTID;
if (!strncmp(field, "type", FIELD_BUF_LEN))
return BTRFS_KEY_TYPE;
if (!strncmp(field, "offset", FIELD_BUF_LEN))
return BTRFS_KEY_OFFSET;
return BTRFS_KEY_BAD;
}
static enum btrfs_item_field convert_item_field(char *field)
{
if (!strncmp(field, "offset", FIELD_BUF_LEN))
return BTRFS_ITEM_OFFSET;
return BTRFS_ITEM_BAD;
}
static enum btrfs_dir_item_field convert_dir_item_field(char *field)
{
if (!strncmp(field, "name", FIELD_BUF_LEN))
return BTRFS_DIR_ITEM_NAME;
if (!strncmp(field, "location_objectid", FIELD_BUF_LEN))
return BTRFS_DIR_ITEM_LOCATION_OBJECTID;
return BTRFS_DIR_ITEM_BAD;
}
static u64 generate_u64(u64 orig)
{
u64 ret;
do {
ret = rand_u64();
} while (ret == orig);
return ret;
}
static u32 generate_u32(u32 orig)
{
u32 ret;
do {
ret = rand_u32();
} while (ret == orig);
return ret;
}
static u8 generate_u8(u8 orig)
{
u8 ret;
do {
ret = rand_u8();
} while (ret == orig);
return ret;
}
static int corrupt_block_group(struct btrfs_root *root, u64 bg, char *field)
{
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
struct btrfs_block_group_item *bgi;
struct btrfs_key key;
enum btrfs_block_group_field corrupt_field;
u64 orig, bogus;
int ret = 0;
root = btrfs_extent_root(root->fs_info, 0);
corrupt_field = convert_block_group_field(field);
if (corrupt_field == BTRFS_BLOCK_GROUP_ITEM_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
ret = PTR_ERR(trans);
errno = -ret;
error_msg(ERROR_MSG_START_TRANS, "%m");
return ret;
}
key.objectid = bg;
key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
error("error searching for bg %llu %d", bg, ret);
goto out;
}
ret = 0;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_BLOCK_GROUP_ITEM_KEY) {
error("couldn't find the bg %llu", bg);
goto out;
}
bgi = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_block_group_item);
switch (corrupt_field) {
case BTRFS_BLOCK_GROUP_ITEM_USED:
orig = btrfs_block_group_used(path->nodes[0], bgi);
bogus = generate_u64(orig);
btrfs_set_block_group_used(path->nodes[0], bgi, bogus);
break;
case BTRFS_BLOCK_GROUP_ITEM_CHUNK_OBJECTID:
orig = btrfs_block_group_chunk_objectid(path->nodes[0], bgi);
bogus = generate_u64(orig);
btrfs_set_block_group_chunk_objectid(path->nodes[0], bgi,
bogus);
break;
case BTRFS_BLOCK_GROUP_ITEM_FLAGS:
orig = btrfs_block_group_flags(path->nodes[0], bgi);
bogus = generate_u64(orig);
btrfs_set_block_group_flags(path->nodes[0], bgi, bogus);
break;
default:
ret = -EINVAL;
goto out;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int corrupt_key(struct btrfs_root *root, struct btrfs_key *key,
char *field)
{
enum btrfs_key_field corrupt_field = convert_key_field(field);
struct btrfs_path *path;
struct btrfs_trans_handle *trans;
int ret;
if (corrupt_field == BTRFS_KEY_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
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, key, path, 0, 1);
if (ret < 0)
goto out;
if (ret > 0) {
error("couldn't find the key to corrupt");
ret = -ENOENT;
goto out;
}
switch (corrupt_field) {
case BTRFS_KEY_OBJECTID:
key->objectid = generate_u64(key->objectid);
break;
case BTRFS_KEY_TYPE:
key->type = generate_u8(key->type);
break;
case BTRFS_KEY_OFFSET:
key->offset = generate_u64(key->objectid);
break;
default:
error("invalid field %s, %d", field, corrupt_field);
ret = -EINVAL;
goto out;
}
btrfs_set_item_key_unsafe(root, path, key);
out:
btrfs_free_path(path);
btrfs_commit_transaction(trans, root);
return ret;
}
static int corrupt_dir_item(struct btrfs_root *root, struct btrfs_key *key,
char *field)
{
struct btrfs_trans_handle *trans;
struct btrfs_dir_item *di;
struct btrfs_path *path;
char name[PATH_MAX];
struct btrfs_key location;
struct btrfs_disk_key disk_key;
unsigned long name_ptr;
enum btrfs_dir_item_field corrupt_field =
convert_dir_item_field(field);
u64 bogus;
u16 name_len;
int ret;
if (corrupt_field == BTRFS_DIR_ITEM_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
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, key, path, 0, 1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
error("error searching for dir item %d", ret);
goto out;
}
di = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_dir_item);
switch (corrupt_field) {
case BTRFS_DIR_ITEM_NAME:
name_len = btrfs_dir_name_len(path->nodes[0], di);
name_ptr = (unsigned long)(di + 1);
read_extent_buffer(path->nodes[0], name, name_ptr, name_len);
name[0]++;
write_extent_buffer(path->nodes[0], name, name_ptr, name_len);
btrfs_mark_buffer_dirty(path->nodes[0]);
goto out;
case BTRFS_DIR_ITEM_LOCATION_OBJECTID:
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
bogus = generate_u64(location.objectid);
location.objectid = bogus;
btrfs_cpu_key_to_disk(&disk_key, &location);
btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
btrfs_mark_buffer_dirty(path->nodes[0]);
goto out;
default:
ret = -EINVAL;
goto out;
}
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}
static int corrupt_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 inode, char *field)
{
struct btrfs_inode_item *ei;
struct btrfs_path *path;
struct btrfs_key key;
enum btrfs_inode_field corrupt_field = convert_inode_field(field);
u64 bogus;
u64 orig;
int ret;
if (corrupt_field == BTRFS_INODE_FIELD_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
key.objectid = inode;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = (u64)-1;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0)
goto out;
if (ret) {
if (!path->slots[0]) {
error("couldn't find inode %llu", inode);
ret = -ENOENT;
goto out;
}
path->slots[0]--;
ret = 0;
}
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.objectid != inode) {
error("couldn't find inode %llu", inode);
ret = -ENOENT;
goto out;
}
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_inode_item);
switch (corrupt_field) {
case BTRFS_INODE_FIELD_ISIZE:
orig = btrfs_inode_size(path->nodes[0], ei);
bogus = generate_u64(orig);
btrfs_set_inode_size(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_NBYTES:
orig = btrfs_inode_nbytes(path->nodes[0], ei);
bogus = generate_u64(orig);
btrfs_set_inode_nbytes(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_NLINK:
orig = btrfs_inode_nlink(path->nodes[0], ei);
bogus = generate_u32(orig);
btrfs_set_inode_nlink(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_GENERATION:
orig = btrfs_inode_generation(path->nodes[0], ei);
bogus = generate_u64(orig);
btrfs_set_inode_generation(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_TRANSID:
orig = btrfs_inode_transid(path->nodes[0], ei);
bogus = generate_u64(orig);
btrfs_set_inode_transid(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_BLOCK_GROUP:
orig = btrfs_inode_block_group(path->nodes[0], ei);
bogus = generate_u64(orig);
btrfs_set_inode_block_group(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_MODE:
orig = btrfs_inode_mode(path->nodes[0], ei);
bogus = generate_u32(orig);
btrfs_set_inode_mode(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_UID:
orig = btrfs_inode_uid(path->nodes[0], ei);
bogus = generate_u32(orig);
btrfs_set_inode_uid(path->nodes[0], ei, bogus);
break;
case BTRFS_INODE_FIELD_GID:
orig = btrfs_inode_gid(path->nodes[0], ei);
bogus = generate_u32(orig);
btrfs_set_inode_gid(path->nodes[0], ei, bogus);
break;
default:
ret = -EINVAL;
break;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_free_path(path);
return ret;
}
static int corrupt_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 inode, u64 extent,
char *field, u64 bogus)
{
struct btrfs_file_extent_item *fi;
struct btrfs_path *path;
struct btrfs_key key;
enum btrfs_file_extent_field corrupt_field;
u64 orig;
int ret = 0;
corrupt_field = convert_file_extent_field(field);
if (corrupt_field == BTRFS_FILE_EXTENT_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
key.objectid = inode;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = extent;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0)
goto out;
if (ret) {
error("couldn't find extent %llu for inode %llu",
extent, inode);
ret = -ENOENT;
goto out;
}
fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_file_extent_item);
switch (corrupt_field) {
case BTRFS_FILE_EXTENT_DISK_BYTENR:
orig = btrfs_file_extent_disk_bytenr(path->nodes[0], fi);
bogus = (bogus == (u64)-1) ? generate_u64(orig) : bogus;
btrfs_set_file_extent_disk_bytenr(path->nodes[0], fi, bogus);
break;
case BTRFS_FILE_EXTENT_TYPE:
if (bogus == (u64)-1) {
error("specify a new extent type value (-v)");
ret = -EINVAL;
goto out;
}
btrfs_set_file_extent_type(path->nodes[0], fi, (u8)bogus);
break;
default:
ret = -EINVAL;
break;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_free_path(path);
return ret;
}
static void shift_items(struct btrfs_root *root, struct extent_buffer *eb)
{
int nritems = btrfs_header_nritems(eb);
int shift_space = btrfs_leaf_free_space(eb) / 2;
int slot = nritems / 2;
int i = 0;
unsigned int data_end = btrfs_item_offset(eb, nritems - 1);
/* Shift the item data up to and including slot back by shift space */
memmove_extent_buffer(eb, btrfs_item_nr_offset(eb, 0) + data_end - shift_space,
btrfs_item_nr_offset(eb, 0) + data_end,
btrfs_item_offset(eb, slot - 1) - data_end);
/* Now update the item pointers. */
for (i = nritems - 1; i >= slot; i--) {
u32 offset = btrfs_item_offset(eb, i);
offset -= shift_space;
btrfs_set_item_offset(eb, i, offset);
}
}
static int corrupt_metadata_block(struct btrfs_fs_info *fs_info, u64 block,
char *field)
{
struct extent_buffer *eb;
enum btrfs_metadata_block_field corrupt_field;
int ret;
corrupt_field = convert_metadata_block_field(field);
if (corrupt_field == BTRFS_METADATA_BLOCK_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
eb = read_tree_block(fs_info, block, 0);
if (!extent_buffer_uptodate(eb)) {
error("couldn't read in tree block %s", field);
return -EINVAL;
}
ret = 0;
switch (corrupt_field) {
case BTRFS_METADATA_BLOCK_GENERATION:
{
u64 orig = btrfs_header_generation(eb);
u64 bogus = generate_u64(orig);
btrfs_set_header_generation(eb, bogus);
csum_tree_block_size(eb, fs_info->csum_size, 0,
fs_info->csum_type);
ret = write_and_map_eb(fs_info, eb);
free_extent_buffer(eb);
if (ret < 0) {
errno = -ret;
error("failed to write extent buffer at %llu: %m",
eb->start);
return ret;
}
break;
}
case BTRFS_METADATA_BLOCK_SHIFT_ITEMS:
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root;
struct btrfs_path *path;
struct btrfs_key key, root_key;
u64 root_objectid;
u8 level;
root_objectid = btrfs_header_owner(eb);
level = btrfs_header_level(eb);
if (level)
btrfs_node_key_to_cpu(eb, &key, 0);
else
btrfs_item_key_to_cpu(eb, &key, 0);
free_extent_buffer(eb);
root_key.objectid = root_objectid;
root_key.type = BTRFS_ROOT_ITEM_KEY;
root_key.offset = (u64)-1;
root = btrfs_read_fs_root(fs_info, &root_key);
if (IS_ERR(root)) {
error("couldn't find owner root %llu", 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);
ret = PTR_ERR(trans);
errno = -ret;
error_msg(ERROR_MSG_START_TRANS, "%m");
return ret;
}
path->lowest_level = level;
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
error("error searching to node %d", ret);
btrfs_free_path(path);
btrfs_abort_transaction(trans, ret);
return ret;
}
eb = path->nodes[level];
shift_items(root, path->nodes[level]);
btrfs_mark_buffer_dirty(path->nodes[level]);
btrfs_commit_transaction(trans, root);
break;
}
default:
ret = -EINVAL;
break;
}
return ret;
}
static int corrupt_btrfs_item(struct btrfs_root *root, struct btrfs_key *key,
char *field)
{
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
enum btrfs_item_field corrupt_field;
u32 orig, bogus;
int ret;
corrupt_field = convert_item_field(field);
if (corrupt_field == BTRFS_ITEM_BAD) {
error("invalid field %s", field);
return -EINVAL;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_free_path(path);
ret = PTR_ERR(trans);
errno = -ret;
error_msg(ERROR_MSG_START_TRANS, "%m");
return ret;
}
ret = btrfs_search_slot(trans, root, key, path, 0, 1);
if (ret != 0) {
error("error searching to node %d", ret);
goto out;
}
ret = 0;
switch (corrupt_field) {
case BTRFS_ITEM_OFFSET:
orig = btrfs_item_offset(path->nodes[0], path->slots[0]);
bogus = generate_u32(orig);
btrfs_set_item_offset(path->nodes[0], path->slots[0], bogus);
break;
default:
ret = -EINVAL;
break;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_commit_transaction(trans, root);
btrfs_free_path(path);
return ret;
}