diff options
Diffstat (limited to 'btrfs-corrupt-block.c')
| -rw-r--r-- | btrfs-corrupt-block.c | 103 |
1 files changed, 102 insertions, 1 deletions
diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c index 474d48fa..75dca6eb 100644 --- a/btrfs-corrupt-block.c +++ b/btrfs-corrupt-block.c @@ -108,6 +108,7 @@ static void print_usage(void) 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"); + fprintf(stderr, "\t-D Corrupt a dir item, must specify key and field\n"); exit(1); } @@ -301,6 +302,12 @@ enum btrfs_file_extent_field { 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_BAD, @@ -346,6 +353,15 @@ static enum btrfs_key_field convert_key_field(char *field) return BTRFS_KEY_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; @@ -421,6 +437,80 @@ out: 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; + 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) { + 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) { + if (ret > 0) + ret = -ENOENT; + fprintf(stderr, "Error searching for dir item %d\n", 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 = malloc(name_len); + if (!name) { + ret = -ENOMEM; + goto out; + } + 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]); + free(name); + 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) @@ -634,6 +724,7 @@ static struct option long_options[] = { { "metadata-block", 1, NULL, 'm'}, { "field", 1, NULL, 'f'}, { "key", 1, NULL, 'K'}, + { "dir-item", 0, NULL, 'D'}, { 0, 0, 0, 0} }; @@ -797,6 +888,7 @@ int main(int ac, char **av) int corrupt_block_keys = 0; int chunk_rec = 0; int chunk_tree = 0; + int corrupt_di = 0; u64 metadata_block = 0; u64 inode = 0; u64 file_extent = (u64)-1; @@ -808,7 +900,7 @@ int main(int ac, char **av) while(1) { int c; - c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:", long_options, + c = getopt_long(ac, av, "l:c:b:eEkuUi:f:x:m:K:D", long_options, &option_index); if (c < 0) break; @@ -859,6 +951,9 @@ int main(int ac, char **av) print_usage(); } break; + case 'D': + corrupt_di = 1; + break; default: print_usage(); } @@ -955,6 +1050,12 @@ int main(int ac, char **av) ret = corrupt_metadata_block(root, metadata_block, field); goto out_close; } + if (corrupt_di) { + if (!key.objectid || !strlen(field)) + print_usage(); + ret = corrupt_dir_item(root, &key, field); + goto out_close; + } if (key.objectid || key.offset || key.type) { if (!strlen(field)) print_usage(); |