This is a note to let you know that I've just added the patch titled
NFSD: Make nfsd4_remove() 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_remove-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 ebb78dad626e89222ccb62e82042430e87eca39a
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Thu Sep 8 18:14:25 2022 -0400
NFSD: Make nfsd4_remove() wait before returning NFS4ERR_DELAY
[ Upstream commit 5f5f8b6d655fd947e899b1771c2f7cb581a06764 ]
nfsd_unlink() can kick off a CB_RECALL (via
vfs_unlink() -> 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_unlink()
again, once.
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 4c5cc142562b2..d17377148b669 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1790,9 +1790,18 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
fh_fill_pre_attrs(fhp);
if (type != S_IFDIR) {
+ int retries;
+
if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK)
nfsd_close_cached_files(rdentry);
- host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL);
+
+ for (retries = 1;;) {
+ host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL);
+ if (host_err != -EAGAIN || !retries--)
+ break;
+ if (!nfsd_wait_for_delegreturn(rqstp, rinode))
+ break;
+ }
} else {
host_err = vfs_rmdir(&init_user_ns, dirp, rdentry);
}
