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From: Alexander Aring <aahringo@redhat.com>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [PATCH dlm/next] fs: dlm: fix nfs async lock callback handling
Date: Tue,  6 Jun 2023 17:56:26 -0400	[thread overview]
Message-ID: <20230606215626.327239-1-aahringo@redhat.com> (raw)

This patch is fixing the current the callback handling if it's a nfs
async lock request signaled if fl_lmops is set.

When using `stress-ng --fcntl 32` on the kernel log there are several
messages like:

[11185.123533] dlm: dlm_plock_callback: vfs lock error 5d5127 file 000000002dd10f4d fl 000000007d13afae
[11185.127135] dlm: dlm_plock_callback: vfs lock error 5d5127 file 000000002dd10f4d fl 00000000a6046fa0
[11185.142668] dlm: dlm_plock_callback: vfs lock error 5d5127 file 000000002dd10f4d fl 000000001d13dfa5

The commit 40595cdc93ed ("nfs: block notification on fs with its
own ->lock") using only trylocks in an asynchronous polling behaviour. The
behaviour before was however differently by evaluating F_SETLKW or F_SETLK
and evaluating FL_SLEEP which was the case before commit 40595cdc93ed
("nfs: block notification on fs with its own ->lock"). This behaviour
seems to be broken before. This patch will fix the behaviour for the
special nfs case before commit 40595cdc93ed ("nfs: block notification on
fs with its own ->lock").

There is still a TODO of solving the case when an nfs locking request
got interrupted.

Fixes: 40595cdc93ed ("nfs: block notification on fs with its own ->lock")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
---
 fs/dlm/plock.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index 70a4752ed913..6f0ecb2176b0 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -217,27 +217,7 @@ static int dlm_plock_callback(struct plock_op *op)
 	fl = op_data->fl;
 	notify = op_data->callback;
 
-	if (op->info.rv) {
-		notify(fl, op->info.rv);
-		goto out;
-	}
-
-	/* got fs lock; bookkeep locally as well: */
-	flc->fl_flags &= ~FL_SLEEP;
-	if (posix_lock_file(file, flc, NULL)) {
-		/*
-		 * This can only happen in the case of kmalloc() failure.
-		 * The filesystem's own lock is the authoritative lock,
-		 * so a failure to get the lock locally is not a disaster.
-		 * As long as the fs cannot reliably cancel locks (especially
-		 * in a low-memory situation), we're better off ignoring
-		 * this failure than trying to recover.
-		 */
-		log_print("dlm_plock_callback: vfs lock error %llx file %p fl %p",
-			  (unsigned long long)op->info.number, file, fl);
-	}
-
-	rv = notify(fl, 0);
+	rv = notify(fl, op->info.rv);
 	if (rv) {
 		/* XXX: We need to cancel the fs lock here: */
 		log_print("dlm_plock_callback: lock granted after lock request "
-- 
2.31.1


             reply	other threads:[~2023-06-06 21:56 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-06 21:56 Alexander Aring [this message]
2023-06-06 21:58 ` [Cluster-devel] [PATCH dlm/next] fs: dlm: fix nfs async lock callback handling Alexander Aring
2023-06-07  7:35 ` Greg KH

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