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authorYihao Wu <wuyihao@linux.alibaba.com>2019-05-13 14:58:22 +0800
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-05-30 15:51:07 -0400
commitba851a39c9703f09684a541885ed176f8fb7c868 (patch)
treed3b3da1cb56a5fac1005fadccd3b391e7ab2ee76 /fs/nfs
parent52b042ab9948cc367b61f9ca9c18603aa7813c3a (diff)
downloadlinux-ba851a39c9703f09684a541885ed176f8fb7c868.tar.bz2
NFSv4.1: Fix bug only first CB_NOTIFY_LOCK is handled
When a waiter is waked by CB_NOTIFY_LOCK, it will retry nfs4_proc_setlk(). The waiter may fail to nfs4_proc_setlk() and sleep again. However, the waiter is already removed from clp->cl_lock_waitq when handling CB_NOTIFY_LOCK in nfs4_wake_lock_waiter(). So any subsequent CB_NOTIFY_LOCK won't wake this waiter anymore. We should put the waiter back to clp->cl_lock_waitq before retrying. Cc: stable@vger.kernel.org #4.9+ Signed-off-by: Yihao Wu <wuyihao@linux.alibaba.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4proc.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5f89bbd177c6..e38f4af20950 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6987,20 +6987,22 @@ nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
init_wait(&wait);
wait.private = &waiter;
wait.func = nfs4_wake_lock_waiter;
- add_wait_queue(q, &wait);
while(!signalled()) {
+ add_wait_queue(q, &wait);
status = nfs4_proc_setlk(state, cmd, request);
- if ((status != -EAGAIN) || IS_SETLK(cmd))
+ if ((status != -EAGAIN) || IS_SETLK(cmd)) {
+ finish_wait(q, &wait);
break;
+ }
status = -ERESTARTSYS;
freezer_do_not_count();
wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
freezer_count();
+ finish_wait(q, &wait);
}
- finish_wait(q, &wait);
return status;
}
#else /* !CONFIG_NFS_V4_1 */