diff options
Diffstat (limited to 'btrfs-corrupt-block.c')
| -rw-r--r-- | btrfs-corrupt-block.c | 109 |
1 files changed, 108 insertions, 1 deletions
diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c index f0c14a9d..10cae00a 100644 --- a/btrfs-corrupt-block.c +++ b/btrfs-corrupt-block.c @@ -105,6 +105,8 @@ static void print_usage(void) "specify -i for the inode and -f for the field to corrupt)\n"); fprintf(stderr, "\t-m The metadata block to corrupt (must also " "specify -f for the field to corrupt)\n"); + fprintf(stderr, "\t-K The key to corrupt in the format " + "<num>,<num>,<num> (must also specify -f for the field)\n"); fprintf(stderr, "\t-f The field in the item to corrupt\n"); exit(1); } @@ -306,6 +308,13 @@ enum btrfs_metadata_block_field { BTRFS_METADATA_BLOCK_BAD, }; +enum btrfs_key_field { + BTRFS_KEY_OBJECTID, + BTRFS_KEY_TYPE, + BTRFS_KEY_OFFSET, + BTRFS_KEY_BAD, +}; + static enum btrfs_inode_field convert_inode_field(char *field) { if (!strncmp(field, "isize", FIELD_BUF_LEN)) @@ -328,6 +337,17 @@ convert_metadata_block_field(char *field) 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 u64 generate_u64(u64 orig) { u64 ret; @@ -337,6 +357,73 @@ static u64 generate_u64(u64 orig) return ret; } +static u8 generate_u8(u8 orig) +{ + u8 ret; + do { + ret = rand(); + } while (ret == orig); + 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; + + root = root->fs_info->fs_root; + if (corrupt_field == BTRFS_KEY_BAD) { + fprintf(stderr, "Invalid field %s\n", 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) { + fprintf(stderr, "Couldn't find the key to corrupt\n"); + 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: + fprintf(stderr, "Invalid field %s, %d\n", 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_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 inode, char *field) { @@ -548,6 +635,7 @@ static struct option long_options[] = { { "file-extent", 1, NULL, 'x'}, { "metadata-block", 1, NULL, 'm'}, { "field", 1, NULL, 'f'}, + { "key", 1, NULL, 'K'}, { 0, 0, 0, 0} }; @@ -696,6 +784,7 @@ out: int main(int ac, char **av) { struct cache_tree root_cache; + struct btrfs_key key; struct btrfs_root *root; struct extent_buffer *eb; char *dev; @@ -717,10 +806,11 @@ int main(int ac, char **av) field[0] = '\0'; srand(128); + memset(&key, 0, sizeof(key)); while(1) { int c; - c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:", long_options, + c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:", long_options, &option_index); if (c < 0) break; @@ -787,6 +877,17 @@ int main(int ac, char **av) print_usage(); } break; + case 'K': + ret = sscanf(optarg, "%llu,%u,%llu", + &key.objectid, + (unsigned int *)&key.type, + &key.offset); + if (ret != 3) { + fprintf(stderr, "error reading key " + "%d\n", errno); + print_usage(); + } + break; default: print_usage(); } @@ -882,6 +983,12 @@ int main(int ac, char **av) ret = corrupt_metadata_block(root, metadata_block, field); goto out_close; } + if (key.objectid || key.offset || key.type) { + if (!strlen(field)) + print_usage(); + ret = corrupt_key(root, &key, field); + goto out_close; + } /* * If we made it here and we have extent set then we didn't specify * inode and we're screwed. |