forked from Mirrors/btrfs-progs
btrfs-corrupt-block: add -e option to corrupt the extent record
This will zero out the extent allocation tree records for the extent. Signed-off-by: Chris Mason <chris.mason@oracle.com>master
Chris Mason
parent
712c23e38e
commit
34c0fea109
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@ -32,11 +32,6 @@
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#include "list.h"
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#include "version.h"
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/* we write the mirror info to stdout unless they are dumping the data
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* to stdout
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* */
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static FILE *info_file;
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struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
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u32 blocksize, int copy)
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{
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@ -62,7 +57,7 @@ struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
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device->total_ios++;
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eb->dev_bytenr = multi->stripes[0].physical;
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fprintf(info_file, "mirror %d logical %Lu physical %Lu "
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fprintf(stdout, "mirror %d logical %Lu physical %Lu "
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"device %s\n", mirror_num, (unsigned long long)bytenr,
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(unsigned long long)eb->dev_bytenr, device->name);
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kfree(multi);
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@ -106,24 +101,88 @@ static struct option long_options[] = {
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{ 0, 0, 0, 0}
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};
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static int corrupt_extent(struct btrfs_root *root, u64 bytenr, int copy)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_key key;
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struct extent_buffer *leaf;
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u32 item_size;
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unsigned long ptr;
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struct btrfs_path *path;
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int ret;
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int slot;
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trans = btrfs_start_transaction(root, 1);
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path = btrfs_alloc_path();
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key.objectid = bytenr;
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key.type = (u8)-1;
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key.offset = (u64)-1;
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while(1) {
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ret = btrfs_search_slot(trans, root->fs_info->extent_root,
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&key, path, 0, 1);
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if (ret < 0)
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break;
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if (ret > 0) {
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if (path->slots[0] == 0)
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break;
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path->slots[0]--;
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}
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leaf = path->nodes[0];
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slot = path->slots[0];
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btrfs_item_key_to_cpu(leaf, &key, slot);
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if (key.objectid != bytenr)
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break;
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if (key.type != BTRFS_EXTENT_ITEM_KEY &&
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key.type != BTRFS_TREE_BLOCK_REF_KEY &&
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key.type != BTRFS_EXTENT_DATA_REF_KEY &&
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key.type != BTRFS_EXTENT_REF_V0_KEY &&
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key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
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key.type != BTRFS_SHARED_DATA_REF_KEY)
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goto next;
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fprintf(stderr, "corrupting extent record: key %Lu %u %Lu\n",
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key.objectid, key.type, key.offset);
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ptr = btrfs_item_ptr_offset(leaf, slot);
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item_size = btrfs_item_size_nr(leaf, slot);
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memset_extent_buffer(leaf, 0, ptr, item_size);
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btrfs_mark_buffer_dirty(leaf);
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next:
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btrfs_release_path(NULL, path);
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if (key.offset > 0)
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key.offset--;
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if (key.offset == 0)
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break;
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}
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btrfs_free_path(path);
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btrfs_commit_transaction(trans, root);
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ret = close_ctree(root);
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BUG_ON(ret);
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return 0;
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}
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int main(int ac, char **av)
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{
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struct cache_tree root_cache;
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struct btrfs_root *root;
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struct extent_buffer *eb;
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char *dev;
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char *output_file = NULL;
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u64 logical = 0;
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int ret = 0;
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int option_index = 0;
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int copy = 0;
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u64 bytes = 4096;
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int out_fd = 0;
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int err;
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int extent_rec;
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while(1) {
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int c;
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c = getopt_long(ac, av, "l:c:", long_options,
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c = getopt_long(ac, av, "l:c:e", long_options,
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&option_index);
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if (c < 0)
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break;
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@ -152,6 +211,9 @@ int main(int ac, char **av)
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print_usage();
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}
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break;
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case 'e':
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extent_rec = 1;
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break;
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default:
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print_usage();
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}
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@ -174,23 +236,9 @@ int main(int ac, char **av)
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fprintf(stderr, "Open ctree failed\n");
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exit(1);
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}
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info_file = stdout;
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if (output_file) {
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if (strcmp(output_file, "-") == 0) {
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out_fd = 1;
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info_file = stderr;
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} else {
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out_fd = open(output_file, O_RDWR | O_CREAT, 0600);
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if (out_fd < 0)
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goto close;
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err = ftruncate(out_fd, 0);
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if (err) {
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close(out_fd);
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goto close;
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}
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info_file = stdout;
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}
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if (extent_rec) {
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ret = corrupt_extent (root, logical, 0);
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goto out;
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}
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if (bytes == 0)
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@ -201,21 +249,10 @@ int main(int ac, char **av)
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while (bytes > 0) {
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eb = debug_corrupt_block(root, logical, root->sectorsize, copy);
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if (eb && output_file) {
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err = write(out_fd, eb->data, eb->len);
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if (err < 0 || err != eb->len) {
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fprintf(stderr, "output file write failed\n");
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goto out_close_fd;
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}
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}
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free_extent_buffer(eb);
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logical += root->sectorsize;
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bytes -= root->sectorsize;
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}
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out_close_fd:
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if (output_file && out_fd != 1)
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close(out_fd);
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close:
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out:
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return ret;
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}
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