This is a note to let you know that I've just added the patch titled
NFSD: Write verifier might go backwards
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-write-verifier-might-go-backwards.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 dd983c1648ada5d79f92575cfedb05e5189c90ef
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Thu Dec 30 10:26:18 2021 -0500
NFSD: Write verifier might go backwards
[ Upstream commit cdc556600c0133575487cc69fb3128440b3c3e92 ]
When vfs_iter_write() starts to fail because a file system is full,
a bunch of writes can fail at once with ENOSPC. These writes
repeatedly invoke nfsd_reset_boot_verifier() in quick succession.
Ensure that the time it grabs doesn't go backwards due to an ntp
adjustment going on at the same time.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 8554bc7ff4322..4d1d8aa6d7f9d 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -363,7 +363,7 @@ void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn)
static void nfsd_reset_boot_verifier_locked(struct nfsd_net *nn)
{
- ktime_get_real_ts64(&nn->nfssvc_boot);
+ ktime_get_raw_ts64(&nn->nfssvc_boot);
}
void nfsd_reset_boot_verifier(struct nfsd_net *nn)
