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btrfs-progs: check: introduce function to check shared block ref

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Introduce function check_shared_block_backref() to check shared block
ref.

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>
This commit is contained in:
Lu Fengqi 2016-04-23 16:35:04 +08:00 committed by David Sterba
parent d07873c007
commit 1035ca5118
1 changed files with 43 additions and 0 deletions
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43
cmds-check.c
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@ -9034,6 +9034,49 @@ out:
return err;
}
/*
* Check referencer for shared block backref
* If level == -1, this function will resolve the level.
*/
static int check_shared_block_backref(struct btrfs_fs_info *fs_info,
u64 parent, u64 bytenr, int level)
{
struct extent_buffer *eb;
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;
if (level == -1)
level = query_tree_block_level(fs_info, bytenr);
if (level < 0)
goto out;
if (level + 1 != btrfs_header_level(eb))
goto out;
nr = btrfs_header_nritems(eb);
for (i = 0; i < nr; i++) {
if (bytenr == btrfs_node_blockptr(eb, i)) {
found_parent = 1;
break;
}
}
out:
free_extent_buffer(eb);
if (!found_parent) {
error(
"shared extent[%llu %u] lost its parent (parent: %llu, level: %u)",
bytenr, nodesize, parent, level);
return REFERENCER_MISSING;
}
return 0;
}
static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int overwrite)
{