2 * Copyright (C) 2009 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 500
26 #include "kerncompat.h"
30 #include "print-tree.h"
31 #include "transaction.h"
35 struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
36 u32 blocksize, int copy)
39 struct extent_buffer *eb;
41 struct btrfs_multi_bio *multi = NULL;
42 struct btrfs_device *device;
46 eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
52 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
53 eb->start, &length, &multi, mirror_num);
55 device = multi->stripes[0].dev;
58 eb->dev_bytenr = multi->stripes[0].physical;
60 fprintf(stdout, "mirror %d logical %Lu physical %Lu "
61 "device %s\n", mirror_num, (unsigned long long)bytenr,
62 (unsigned long long)eb->dev_bytenr, device->name);
65 if (!copy || mirror_num == copy) {
66 ret = read_extent_from_disk(eb);
67 printf("corrupting %llu copy %d\n", eb->start,
69 memset(eb->data, 0, eb->len);
70 write_extent_to_disk(eb);
74 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
80 if (mirror_num > num_copies)
86 static void print_usage(void)
88 fprintf(stderr, "usage: btrfs-map-logical [options] mount_point\n");
89 fprintf(stderr, "\t-l Logical extent to map\n");
90 fprintf(stderr, "\t-c Copy of the extent to read (usually 1 or 2)\n");
91 fprintf(stderr, "\t-o Output file to hold the extent\n");
92 fprintf(stderr, "\t-b Number of bytes to read\n");
96 static void corrupt_keys(struct btrfs_trans_handle *trans,
97 struct btrfs_root *root,
98 struct extent_buffer *eb)
103 struct btrfs_disk_key bad_key;;
105 nr = btrfs_header_nritems(eb);
110 bad_slot = rand() % nr;
112 if (bad_slot == slot)
115 fprintf(stderr, "corrupting keys in block %llu slot %d swapping with %d\n",
116 (unsigned long long)eb->start, slot, bad_slot);
118 if (btrfs_header_level(eb) == 0) {
119 btrfs_item_key(eb, &bad_key, bad_slot);
120 btrfs_set_item_key(eb, &bad_key, slot);
122 btrfs_node_key(eb, &bad_key, bad_slot);
123 btrfs_set_node_key(eb, &bad_key, slot);
125 btrfs_mark_buffer_dirty(eb);
127 csum_tree_block(root, eb, 0);
128 write_extent_to_disk(eb);
133 static int corrupt_keys_in_block(struct btrfs_root *root, u64 bytenr)
135 struct extent_buffer *eb;
137 eb = read_tree_block(root, bytenr, root->leafsize, 0);
141 corrupt_keys(NULL, root, eb);
142 free_extent_buffer(eb);
146 static int corrupt_extent(struct btrfs_trans_handle *trans,
147 struct btrfs_root *root, u64 bytenr, int copy)
149 struct btrfs_key key;
150 struct extent_buffer *leaf;
153 struct btrfs_path *path;
156 int should_del = rand() % 3;
158 path = btrfs_alloc_path();
160 key.objectid = bytenr;
162 key.offset = (u64)-1;
165 ret = btrfs_search_slot(trans, root->fs_info->extent_root,
171 if (path->slots[0] == 0)
176 leaf = path->nodes[0];
177 slot = path->slots[0];
178 btrfs_item_key_to_cpu(leaf, &key, slot);
179 if (key.objectid != bytenr)
182 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
183 key.type != BTRFS_TREE_BLOCK_REF_KEY &&
184 key.type != BTRFS_EXTENT_DATA_REF_KEY &&
185 key.type != BTRFS_EXTENT_REF_V0_KEY &&
186 key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
187 key.type != BTRFS_SHARED_DATA_REF_KEY)
191 fprintf(stderr, "deleting extent record: key %Lu %u %Lu\n",
192 key.objectid, key.type, key.offset);
194 if (key.type == BTRFS_EXTENT_ITEM_KEY) {
195 /* make sure this extent doesn't get
196 * reused for other purposes */
197 btrfs_pin_extent(root->fs_info,
198 key.objectid, key.offset);
201 btrfs_del_item(trans, root, path);
203 fprintf(stderr, "corrupting extent record: key %Lu %u %Lu\n",
204 key.objectid, key.type, key.offset);
205 ptr = btrfs_item_ptr_offset(leaf, slot);
206 item_size = btrfs_item_size_nr(leaf, slot);
207 memset_extent_buffer(leaf, 0, ptr, item_size);
208 btrfs_mark_buffer_dirty(leaf);
211 btrfs_release_path(NULL, path);
219 btrfs_free_path(path);
223 static void btrfs_corrupt_extent_leaf(struct btrfs_trans_handle *trans,
224 struct btrfs_root *root, struct extent_buffer *eb)
226 u32 nr = btrfs_header_nritems(eb);
227 u32 victim = rand() % nr;
229 struct btrfs_key key;
231 btrfs_item_key_to_cpu(eb, &key, victim);
232 objectid = key.objectid;
233 corrupt_extent(trans, root, objectid, 1);
236 static void btrfs_corrupt_extent_tree(struct btrfs_trans_handle *trans,
237 struct btrfs_root *root, struct extent_buffer *eb)
245 nr = btrfs_header_nritems(eb);
246 if (btrfs_is_leaf(eb)) {
247 btrfs_corrupt_extent_leaf(trans, root, eb);
251 if (btrfs_header_level(eb) == 1 && eb != root->node) {
256 for (i = 0; i < nr; i++) {
257 struct extent_buffer *next;
259 next = read_tree_block(root, btrfs_node_blockptr(eb, i),
260 root->leafsize, btrfs_node_ptr_generation(eb, i));
263 btrfs_corrupt_extent_tree(trans, root, next);
264 free_extent_buffer(next);
268 static struct option long_options[] = {
269 /* { "byte-count", 1, NULL, 'b' }, */
270 { "logical", 1, NULL, 'l' },
271 { "copy", 1, NULL, 'c' },
272 { "bytes", 1, NULL, 'b' },
273 { "extent-record", 0, NULL, 'e' },
274 { "extent-tree", 0, NULL, 'E' },
275 { "keys", 0, NULL, 'k' },
280 int main(int ac, char **av)
282 struct cache_tree root_cache;
283 struct btrfs_root *root;
284 struct extent_buffer *eb;
288 int option_index = 0;
293 int corrupt_block_keys = 0;
299 c = getopt_long(ac, av, "l:c:eEk", long_options,
305 logical = atoll(optarg);
308 "invalid extent number\n");
316 "invalid copy number\n");
321 bytes = atoll(optarg);
324 "invalid byte count\n");
335 corrupt_block_keys = 1;
344 if (logical == 0 && !extent_tree)
352 cache_tree_init(&root_cache);
354 root = open_ctree(dev, 0, 1);
356 fprintf(stderr, "Open ctree failed\n");
360 struct btrfs_trans_handle *trans;
361 trans = btrfs_start_transaction(root, 1);
362 ret = corrupt_extent (trans, root, logical, 0);
363 btrfs_commit_transaction(trans, root);
367 struct btrfs_trans_handle *trans;
368 trans = btrfs_start_transaction(root, 1);
369 btrfs_corrupt_extent_tree(trans, root->fs_info->extent_root,
370 root->fs_info->extent_root->node);
371 btrfs_commit_transaction(trans, root);
376 bytes = root->sectorsize;
378 bytes = (bytes + root->sectorsize - 1) / root->sectorsize;
379 bytes *= root->sectorsize;
382 if (corrupt_block_keys) {
383 corrupt_keys_in_block(root, logical);
385 eb = debug_corrupt_block(root, logical,
386 root->sectorsize, copy);
387 free_extent_buffer(eb);
389 logical += root->sectorsize;
390 bytes -= root->sectorsize;