From: Darrick J. Wong <djwong@xxxxxxxxxx>
Source kernel commit: 61b3f0df5c235806d372aaf696ce9aee7746d18f
If the fs has parent pointers, we need to check that each child dirent
points to a file that has a parent pointer pointing back at us.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
libxfs/xfs_parent.c | 22 ++++++++++++++++++++++
libxfs/xfs_parent.h | 5 +++++
2 files changed, 27 insertions(+)
diff --git a/libxfs/xfs_parent.c b/libxfs/xfs_parent.c
index bb0465197..8c29ba61c 100644
--- a/libxfs/xfs_parent.c
+++ b/libxfs/xfs_parent.c
@@ -288,3 +288,25 @@ xfs_parent_from_attr(
*parent_gen = be32_to_cpu(rec->p_gen);
return 0;
}
+
+/*
+ * Look up a parent pointer record (@parent_name -> @pptr) of @ip.
+ *
+ * Caller must hold at least ILOCK_SHARED. The scratchpad need not be
+ * initialized.
+ *
+ * Returns 0 if the pointer is found, -ENOATTR if there is no match, or a
+ * negative errno.
+ */
+int
+xfs_parent_lookup(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ const struct xfs_name *parent_name,
+ struct xfs_parent_rec *pptr,
+ struct xfs_da_args *scratch)
+{
+ memset(scratch, 0, sizeof(struct xfs_da_args));
+ xfs_parent_da_args_init(scratch, tp, pptr, ip, ip->i_ino, parent_name);
+ return xfs_attr_get_ilocked(scratch);
+}
diff --git a/libxfs/xfs_parent.h b/libxfs/xfs_parent.h
index d7ab09e73..977885823 100644
--- a/libxfs/xfs_parent.h
+++ b/libxfs/xfs_parent.h
@@ -96,4 +96,9 @@ int xfs_parent_from_attr(struct xfs_mount *mp, unsigned int attr_flags,
const void *value, unsigned int valuelen,
xfs_ino_t *parent_ino, uint32_t *parent_gen);
+/* Repair functions */
+int xfs_parent_lookup(struct xfs_trans *tp, struct xfs_inode *ip,
+ const struct xfs_name *name, struct xfs_parent_rec *pptr,
+ struct xfs_da_args *scratch);
+
#endif /* __XFS_PARENT_H__ */
