This is a note to let you know that I've just added the patch titled
NFSD: Make nfsd4_rename() wait before returning NFS4ERR_DELAY
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-make-nfsd4_rename-wait-before-returning-nfs4err.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 885bd12b825f43a96e8667a71cc4f98cfac5703d
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Thu Sep 8 18:14:19 2022 -0400
NFSD: Make nfsd4_rename() wait before returning NFS4ERR_DELAY
[ Upstream commit 68c522afd0b1936b48a03a4c8b81261e7597c62d ]
nfsd_rename() can kick off a CB_RECALL (via
vfs_rename() -> leases_conflict()) if a delegation is present.
Before returning NFS4ERR_DELAY, give the client holding that
delegation a chance to return it and then retry the nfsd_rename()
again, once.
This version of the patch handles renaming an existing file,
but does not deal with renaming onto an existing file. That
case will still always trigger an NFS4ERR_DELAY.
Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=354
Tested-by: Igor Mammedov <imammedo@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index e8329051dde01..4c5cc142562b2 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1698,7 +1698,15 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
.new_dir = tdir,
.new_dentry = ndentry,
};
- host_err = vfs_rename(&rd);
+ int retries;
+
+ for (retries = 1;;) {
+ host_err = vfs_rename(&rd);
+ if (host_err != -EAGAIN || !retries--)
+ break;
+ if (!nfsd_wait_for_delegreturn(rqstp, d_inode(odentry)))
+ break;
+ }
if (!host_err) {
host_err = commit_metadata(tfhp);
if (!host_err)
