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Subject[PATCH] nfs: local_lock: handle async processing of F_SETLK with FL_SLEEP
Date
nfsd and lockd use F_SETLK cmd with the FL_SLEEP flag set to request
asynchronous processing of blocking locks.

Currently nfs mounted with 'local_lock' option use locks_lock_file_wait()
function blocked on such requests.

To handle such requests properly, non-blocking posix_file_lock()
function should be used instead.

https://bugzilla.kernel.org/show_bug.cgi?id=215383
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
fs/nfs/file.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 24e7dccce355..c9c974ee2f43 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -769,9 +769,11 @@ do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
*/
if (!is_local)
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
+ else if ((fl->fl_flags && FL_SLEEP) && IS_SETLK(cmd))
+ status = posix_lock_file(filp, fl, NULL);
else
status = locks_lock_file_wait(filp, fl);
- if (status < 0)
+ if (status)
goto out;

/*
--
2.25.1
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