[PATCH stable 5.15] xfs: remove incorrect ASSERT in xfs_rename

[Kuniyuki Iwashima <kuniyu@amazon.com>]

From: Eric Sandeen <sandeen@redhat.com>

commit e445976537ad139162980bee015b7364e5b64fff upstream.

Ayushman Dutta reported our 5.10 kernel hit the warning.  It was because
the original commit misses a Fixes tag and was not backported to the stable
tree.  The fix is merged in 5.16, so please backport it to 5.15 first.

This ASSERT in xfs_rename is a) incorrect, because
(RENAME_WHITEOUT|RENAME_NOREPLACE) is a valid combination, and
b) unnecessary, because actual invalid flag combinations are already
handled at the vfs level in do_renameat2() before we get called.
So, remove it.

Reported-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Fixes: 7dcf5c3e4527 ("xfs: add RENAME_WHITEOUT support")
Reported-by: Ayushman Dutta <ayudutta@amazon.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
I will send another patch for 4.9 - 5.4 because of a conflict with idmapped
mount changes.
---
 fs/xfs/xfs_inode.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 2477e301fa82..c19f3ca605af 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3128,7 +3128,6 @@ xfs_rename(
 	 * appropriately.
 	 */
 	if (flags & RENAME_WHITEOUT) {
-		ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
 		error = xfs_rename_alloc_whiteout(mnt_userns, target_dp, &wip);
 		if (error)
 			return error;
-- 
2.30.2