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author | Lu Fengqi <lufq.fnst@cn.fujitsu.com> | 2016-04-24 13:33:47 +0800 |
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committer | David Sterba <dsterba@suse.com> | 2016-08-17 18:51:20 +0200 |
commit | bf5e74204e5d40545cc97a9a79d340b1615003a4 (patch) | |
tree | 0d666af2df3d94f0a8e103196a5f5e62b994133a /cmds-check.c | |
parent | 4e6bbaebb8fc99dade80418db0ffd6b17d64b98f (diff) |
btrfs-progs: check: introduce function to check shared data backref
Introduce the function check_shared_data_backref() to check the
referencer of a given shared data backref.
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'cmds-check.c')
-rw-r--r-- | cmds-check.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/cmds-check.c b/cmds-check.c index 3bf1b357..32e2e121 100644 --- a/cmds-check.c +++ b/cmds-check.c @@ -9177,6 +9177,50 @@ out: return 0; } +/* + * Check if the referencer of a shared data backref exists + */ +static int check_shared_data_backref(struct btrfs_fs_info *fs_info, + u64 parent, u64 bytenr) +{ + struct extent_buffer *eb; + struct btrfs_key key; + struct btrfs_file_extent_item *fi; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + u32 nr; + int found_parent = 0; + int i; + + eb = read_tree_block_fs_info(fs_info, parent, nodesize, 0); + if (!extent_buffer_uptodate(eb)) + goto out; + + nr = btrfs_header_nritems(eb); + for (i = 0; i < nr; i++) { + btrfs_item_key_to_cpu(eb, &key, i); + if (key.type != BTRFS_EXTENT_DATA_KEY) + continue; + + fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); + if (btrfs_file_extent_type(eb, fi) == BTRFS_FILE_EXTENT_INLINE) + continue; + + if (btrfs_file_extent_disk_bytenr(eb, fi) == bytenr) { + found_parent = 1; + break; + } + } + +out: + free_extent_buffer(eb); + if (!found_parent) { + error("shared extent %llu referencer lost (parent: %llu)", + bytenr, parent); + return REFERENCER_MISSING; + } + return 0; +} + static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, int overwrite) { |