xfs: revert commit 44af6c7e59

BugLink: https://bugs.launchpad.net/bugs/2097575

commit 2a009397eb5ae178670cbd7101e9635cf6412b35 upstream.

[backport: resolve conflicts due to new xattr walk helper]

In my haste to fix what I thought was a performance problem in the attr
scrub code, I neglected to notice that the xfs_attr_get_ilocked also had
the effect of checking that attributes can actually be looked up through
the attr dabtree.  Fix this.

Fixes: 44af6c7e59 ("xfs: don't load local xattr values during scrub")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

fs/xfs/scrub/attr.c

@@ -199,14 +199,6 @@ xchk_xattr_listent(
 		goto fail_xref;
 	}
 
-	/*
-	 * Local xattr values are stored in the attr leaf block, so we don't
-	 * need to retrieve the value from a remote block to detect corruption
-	 * problems.
-	 */
-	if (flags & XFS_ATTR_LOCAL)
-		goto fail_xref;
-
 	/*
 	 * Try to allocate enough memory to extrat the attr value.  If that
 	 * doesn't work, we overload the seen_enough variable to convey
@@ -222,6 +214,11 @@ xchk_xattr_listent(
 
 	args.value = ab->value;
 
+	/*
+	 * Get the attr value to ensure that lookup can find this attribute
+	 * through the dabtree indexing and that remote value retrieval also
+	 * works correctly.
+	 */
 	error = xfs_attr_get_ilocked(&args);
 	/* ENODATA means the hash lookup failed and the attr is bad */
 	if (error == -ENODATA)