btrfs-corrupt-block: add -E option to randomly corrupt the extent_root
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
f5c4c4f3b7
commit
08e2cb625e
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@ -93,17 +93,9 @@ static void print_usage(void)
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exit(1);
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}
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static struct option long_options[] = {
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/* { "byte-count", 1, NULL, 'b' }, */
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{ "logical", 1, NULL, 'l' },
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{ "copy", 1, NULL, 'c' },
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{ "bytes", 1, NULL, 'b' },
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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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static int corrupt_extent(struct btrfs_trans_handle *trans,
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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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@ -111,8 +103,8 @@ static int corrupt_extent(struct btrfs_root *root, u64 bytenr, int copy)
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struct btrfs_path *path;
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int ret;
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int slot;
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int should_del = rand() % 3;
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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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@ -121,7 +113,7 @@ static int corrupt_extent(struct btrfs_root *root, u64 bytenr, int copy)
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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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&key, path, -1, 1);
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if (ret < 0)
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break;
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@ -129,6 +121,7 @@ static int corrupt_extent(struct btrfs_root *root, u64 bytenr, int copy)
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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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ret = 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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@ -144,13 +137,26 @@ static int corrupt_extent(struct btrfs_root *root, u64 bytenr, int copy)
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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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if (should_del) {
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fprintf(stderr, "deleting 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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if (key.type == BTRFS_EXTENT_ITEM_KEY) {
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/* make sure this extent doesn't get
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* reused for other purposes */
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btrfs_pin_extent(root->fs_info,
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key.objectid, key.offset);
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}
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btrfs_del_item(trans, root, path);
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} else {
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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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}
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next:
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btrfs_release_path(NULL, path);
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@ -161,12 +167,65 @@ next:
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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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static void btrfs_corrupt_extent_leaf(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct extent_buffer *eb)
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{
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u32 nr = btrfs_header_nritems(eb);
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u32 victim = rand() % nr;
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u64 objectid;
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struct btrfs_key key;
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btrfs_item_key_to_cpu(eb, &key, victim);
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objectid = key.objectid;
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corrupt_extent(trans, root, objectid, 1);
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}
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static void btrfs_corrupt_extent_tree(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct extent_buffer *eb)
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{
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int i;
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u32 nr;
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if (!eb)
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return;
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nr = btrfs_header_nritems(eb);
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if (btrfs_is_leaf(eb)) {
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btrfs_corrupt_extent_leaf(trans, root, eb);
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return;
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}
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if (btrfs_header_level(eb) == 1 && eb != root->node) {
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if (rand() % 5)
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return;
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}
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for (i = 0; i < nr; i++) {
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struct extent_buffer *next;
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next = read_tree_block(root, btrfs_node_blockptr(eb, i),
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root->leafsize, btrfs_node_ptr_generation(eb, i));
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if (!next)
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continue;
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btrfs_corrupt_extent_tree(trans, root, next);
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free_extent_buffer(next);
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}
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}
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static struct option long_options[] = {
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/* { "byte-count", 1, NULL, 'b' }, */
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{ "logical", 1, NULL, 'l' },
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{ "copy", 1, NULL, 'c' },
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{ "bytes", 1, NULL, 'b' },
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{ "extent-record", 0, NULL, 'e' },
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{ "extent-tree", 0, NULL, 'E' },
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{ 0, 0, 0, 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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@ -178,11 +237,14 @@ int main(int ac, char **av)
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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 extent_rec;
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int extent_rec = 0;
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int extent_tree = 0;
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srand(128);
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while(1) {
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int c;
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c = getopt_long(ac, av, "l:c:e", long_options,
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c = getopt_long(ac, av, "l:c:eE", long_options,
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&option_index);
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if (c < 0)
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break;
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@ -214,6 +276,9 @@ int main(int ac, char **av)
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case 'e':
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extent_rec = 1;
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break;
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case 'E':
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extent_tree = 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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@ -221,7 +286,7 @@ int main(int ac, char **av)
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ac = ac - optind;
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if (ac == 0)
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print_usage();
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if (logical == 0)
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if (logical == 0 && !extent_tree)
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print_usage();
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if (copy < 0)
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print_usage();
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@ -237,8 +302,19 @@ int main(int ac, char **av)
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exit(1);
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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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struct btrfs_trans_handle *trans;
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trans = btrfs_start_transaction(root, 1);
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ret = corrupt_extent (trans, root, logical, 0);
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btrfs_commit_transaction(trans, root);
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goto out_close;
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}
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if (extent_tree) {
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struct btrfs_trans_handle *trans;
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trans = btrfs_start_transaction(root, 1);
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btrfs_corrupt_extent_tree(trans, root->fs_info->extent_root,
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root->fs_info->extent_root->node);
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btrfs_commit_transaction(trans, root);
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goto out_close;
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}
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if (bytes == 0)
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@ -253,6 +329,8 @@ int main(int ac, char **av)
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logical += root->sectorsize;
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bytes -= root->sectorsize;
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}
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out:
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return ret;
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out_close:
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close_ctree(root);
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return ret;
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}
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@ -1083,7 +1083,9 @@ static int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
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ptr += sizeof(struct btrfs_tree_block_info);
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BUG_ON(ptr > end);
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} else {
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BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA));
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if (!(flags & BTRFS_EXTENT_FLAG_DATA)) {
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return -EIO;
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}
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}
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err = -ENOENT;
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@ -2120,8 +2122,6 @@ static int __free_extent(struct btrfs_trans_handle *trans,
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extent_slot = path->slots[0];
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}
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} else {
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btrfs_print_leaf(extent_root, path->nodes[0]);
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WARN_ON(1);
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printk(KERN_ERR "btrfs unable to find ref byte nr %llu "
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"parent %llu root %llu owner %llu offset %llu\n",
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(unsigned long long)bytenr,
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@ -2129,6 +2129,8 @@ static int __free_extent(struct btrfs_trans_handle *trans,
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(unsigned long long)root_objectid,
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(unsigned long long)owner_objectid,
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(unsigned long long)owner_offset);
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ret = -EIO;
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goto fail;
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}
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leaf = path->nodes[0];
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@ -2238,6 +2240,7 @@ static int __free_extent(struct btrfs_trans_handle *trans,
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mark_free);
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BUG_ON(ret);
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}
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fail:
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btrfs_free_path(path);
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finish_current_insert(trans, extent_root);
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return ret;
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