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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>
master
Lu Fengqi 2016-04-24 13:33:47 +08:00 committed by David Sterba
parent 4e6bbaebb8
commit bf5e74204e
1 changed files with 44 additions and 0 deletions
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44
cmds-check.c
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@ -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)
{