From: Lu Fengqi <lufq.fnst@xxxxxxxxxxxxxx>
Introduce the function check_shared_data_backref() to check the
referencer of a given shared data backref.
Signed-off-by: Lu Fengqi <lufq.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
cmds-check.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/cmds-check.c b/cmds-check.c
index 6b59397..18325f9 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -9028,6 +9028,50 @@ 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)
{
--
2.8.2
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