xfs: create a hashname function for parent pointers

Although directory entry and parent pointer recordsets look very similar
(name -> ino), there's one major difference between them: a file can be
hardlinked from multiple parent directories with the same filename.
This is common in shared container environments where a base directory
tree might be hardlink-copied multiple times.  IOWs the same 'ls'
program might be hardlinked to multiple /srv/*/bin/ls paths.

We don't want parent pointer operations to bog down on hash collisions
between the same dirent name, so create a special hash function that
mixes in the parent directory inode number.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/libxfs/xfs_attr.c

@@ -437,6 +437,9 @@ xfs_attr_hashval(
 {
 	ASSERT(xfs_attr_check_namespace(attr_flags));
 
+	if (attr_flags & XFS_ATTR_PARENT)
+		return xfs_parent_hashattr(mp, name, namelen, value, valuelen);
+
 	return xfs_attr_hashname(name, namelen);
 }
 

fs/xfs/libxfs/xfs_parent.c

@@ -90,3 +90,50 @@ xfs_parent_valuecheck(
 
 	return true;
 }
+
+/* Compute the attribute name hash for a parent pointer. */
+xfs_dahash_t
+xfs_parent_hashval(
+	struct xfs_mount		*mp,
+	const uint8_t			*name,
+	int				namelen,
+	xfs_ino_t			parent_ino)
+{
+	struct xfs_name			xname = {
+		.name			= name,
+		.len			= namelen,
+	};
+
+	/*
+	 * Use the same dirent name hash as would be used on the directory, but
+	 * mix in the parent inode number to avoid collisions on hardlinked
+	 * files with identical names but different parents.
+	 */
+	return xfs_dir2_hashname(mp, &xname) ^
+		upper_32_bits(parent_ino) ^ lower_32_bits(parent_ino);
+}
+
+/* Compute the attribute name hash from the xattr components. */
+xfs_dahash_t
+xfs_parent_hashattr(
+	struct xfs_mount		*mp,
+	const uint8_t			*name,
+	int				namelen,
+	const void			*value,
+	int				valuelen)
+{
+	const struct xfs_parent_rec	*rec = value;
+
+	/* Requires a local attr value in xfs_parent_rec format */
+	if (valuelen != sizeof(struct xfs_parent_rec)) {
+		ASSERT(valuelen == sizeof(struct xfs_parent_rec));
+		return 0;
+	}
+
+	if (!value) {
+		ASSERT(value != NULL);
+		return 0;
+	}
+
+	return xfs_parent_hashval(mp, name, namelen, be64_to_cpu(rec->p_ino));
+}

fs/xfs/libxfs/xfs_parent.h

@@ -12,4 +12,9 @@ bool xfs_parent_namecheck(unsigned int attr_flags, const void *name,
 bool xfs_parent_valuecheck(struct xfs_mount *mp, const void *value,
 		size_t valuelen);
 
+xfs_dahash_t xfs_parent_hashval(struct xfs_mount *mp, const uint8_t *name,
+		int namelen, xfs_ino_t parent_ino);
+xfs_dahash_t xfs_parent_hashattr(struct xfs_mount *mp, const uint8_t *name,
+		int namelen, const void *value, int valuelen);
+
 #endif /* __XFS_PARENT_H__ */

fs/xfs/scrub/attr.c

@@ -536,6 +536,10 @@ xchk_xattr_rec(
 			xchk_da_set_corrupt(ds, level);
 			goto out;
 		}
+		if (ent->flags & XFS_ATTR_PARENT) {
+			xchk_da_set_corrupt(ds, level);
+			goto out;
+		}
 		calc_hash = xfs_attr_hashval(mp, ent->flags, rentry->name,
 					     rentry->namelen, NULL,
 					     be32_to_cpu(rentry->valuelen));