This is a note to let you know that I've just added the patch titled
NFSD: Use set_bit(RQ_DROPME)
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-use-set_bit-rq_dropme.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 fc5b681f66fd4ad86dc8df55d27406c9d92179ef
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Sat Jan 7 10:15:35 2023 -0500
NFSD: Use set_bit(RQ_DROPME)
[ Upstream commit 5304930dbae82d259bcf7e5611db7c81e7a42eff ]
The premise that "Once an svc thread is scheduled and executing an
RPC, no other processes will touch svc_rqst::rq_flags" is false.
svc_xprt_enqueue() examines the RQ_BUSY flag in scheduled nfsd
threads when determining which thread to wake up next.
Fixes: 9315564747cb ("NFSD: Use only RQ_DROPME to signal the need to drop a reply")
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index a5570cf75f3fd..9744443c39652 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -211,7 +211,7 @@ nfsd_proc_read(struct svc_rqst *rqstp)
if (resp->status == nfs_ok)
resp->status = fh_getattr(&resp->fh, &resp->stat);
else if (resp->status == nfserr_jukebox)
- __set_bit(RQ_DROPME, &rqstp->rq_flags);
+ set_bit(RQ_DROPME, &rqstp->rq_flags);
return rpc_success;
}
@@ -246,7 +246,7 @@ nfsd_proc_write(struct svc_rqst *rqstp)
if (resp->status == nfs_ok)
resp->status = fh_getattr(&resp->fh, &resp->stat);
else if (resp->status == nfserr_jukebox)
- __set_bit(RQ_DROPME, &rqstp->rq_flags);
+ set_bit(RQ_DROPME, &rqstp->rq_flags);
return rpc_success;
}
