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 /* we write the mirror info to stdout unless they are dumping the data
38 static FILE *info_file;
40 struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
41 u32 blocksize, int copy)
44 struct extent_buffer *eb;
46 struct btrfs_multi_bio *multi = NULL;
47 struct btrfs_device *device;
51 eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
57 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
58 eb->start, &length, &multi, mirror_num);
60 device = multi->stripes[0].dev;
63 eb->dev_bytenr = multi->stripes[0].physical;
65 fprintf(info_file, "mirror %d logical %Lu physical %Lu "
66 "device %s\n", mirror_num, (unsigned long long)bytenr,
67 (unsigned long long)eb->dev_bytenr, device->name);
70 if (!copy || mirror_num == copy) {
71 ret = read_extent_from_disk(eb);
72 printf("corrupting %llu copy %d\n", eb->start,
74 memset(eb->data, 0, eb->len);
75 write_extent_to_disk(eb);
79 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
85 if (mirror_num > num_copies)
91 static void print_usage(void)
93 fprintf(stderr, "usage: btrfs-map-logical [options] mount_point\n");
94 fprintf(stderr, "\t-l Logical extent to map\n");
95 fprintf(stderr, "\t-c Copy of the extent to read (usually 1 or 2)\n");
96 fprintf(stderr, "\t-o Output file to hold the extent\n");
97 fprintf(stderr, "\t-b Number of bytes to read\n");
101 static struct option long_options[] = {
102 /* { "byte-count", 1, NULL, 'b' }, */
103 { "logical", 1, NULL, 'l' },
104 { "copy", 1, NULL, 'c' },
105 { "bytes", 1, NULL, 'b' },
109 int main(int ac, char **av)
111 struct cache_tree root_cache;
112 struct btrfs_root *root;
113 struct extent_buffer *eb;
115 char *output_file = NULL;
118 int option_index = 0;
126 c = getopt_long(ac, av, "l:c:", long_options,
132 logical = atoll(optarg);
135 "invalid extent number\n");
143 "invalid copy number\n");
148 bytes = atoll(optarg);
151 "invalid byte count\n");
170 cache_tree_init(&root_cache);
172 root = open_ctree(dev, 0, 1);
174 fprintf(stderr, "Open ctree failed\n");
180 if (strcmp(output_file, "-") == 0) {
184 out_fd = open(output_file, O_RDWR | O_CREAT, 0600);
187 err = ftruncate(out_fd, 0);
197 bytes = root->sectorsize;
199 bytes = (bytes + root->sectorsize - 1) / root->sectorsize;
200 bytes *= root->sectorsize;
203 eb = debug_corrupt_block(root, logical, root->sectorsize, copy);
204 if (eb && output_file) {
205 err = write(out_fd, eb->data, eb->len);
206 if (err < 0 || err != eb->len) {
207 fprintf(stderr, "output file write failed\n");
211 free_extent_buffer(eb);
212 logical += root->sectorsize;
213 bytes -= root->sectorsize;
217 if (output_file && out_fd != 1)