Re: FAILED: patch "[PATCH] nfsd: lock_rename() needs both directories to live on the" failed to apply to 5.4-stable tree

[Al Viro <viro@zeniv.linux.org.uk>]

On Fri, Oct 27, 2023 at 02:18:01PM +0200, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 5.4-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.

Trivial context change in that one, really.  The if (...) following the
second chunk has changed; git cherry-pick is unhappy about it.  See below
for rebased diff (identical to the original except for the post-chunk
context):

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index b6f4b552c9af..6aa968bee0ce 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1689,6 +1689,12 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
 	if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
 		goto out;
 
+	err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
+	if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
+		goto out;
+	if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry)
+		goto out;
+
 retry:
 	host_err = fh_want_write(ffhp);
 	if (host_err) {
@@ -1723,12 +1729,6 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
 	if (ndentry == trap)
 		goto out_dput_new;
 
-	host_err = -EXDEV;
-	if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
-		goto out_dput_new;
-	if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry)
-		goto out_dput_new;
-
 	if (nfsd_has_cached_files(ndentry)) {
 		has_cached = true;
 		goto out_dput_old;