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Subject[PATCH 4.4 30/87] locks: dont check for race with close when setting OFD lock
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Layton <jeff.layton@primarydata.com>

commit 0752ba807b04ccd69cb4bc8bbf829a80ee208a3c upstream.

We don't clean out OFD locks on close(), so there's no need to check
for a race with them here. They'll get cleaned out at the same time
that flock locks are.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Acked-by: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>


---
fs/locks.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2220,10 +2220,12 @@ int fcntl_setlk(unsigned int fd, struct
error = do_lock_file_wait(filp, cmd, file_lock);

/*
- * Attempt to detect a close/fcntl race and recover by
- * releasing the lock that was just acquired.
+ * Attempt to detect a close/fcntl race and recover by releasing the
+ * lock that was just acquired. There is no need to do that when we're
+ * unlocking though, or for OFD locks.
*/
- if (!error && file_lock->fl_type != F_UNLCK) {
+ if (!error && file_lock->fl_type != F_UNLCK &&
+ !(file_lock->fl_flags & FL_OFDLCK)) {
/*
* We need that spin_lock here - it prevents reordering between
* update of i_flctx->flc_posix and check for it done in
@@ -2362,10 +2364,12 @@ int fcntl_setlk64(unsigned int fd, struc
error = do_lock_file_wait(filp, cmd, file_lock);

/*
- * Attempt to detect a close/fcntl race and recover by
- * releasing the lock that was just acquired.
+ * Attempt to detect a close/fcntl race and recover by releasing the
+ * lock that was just acquired. There is no need to do that when we're
+ * unlocking though, or for OFD locks.
*/
- if (!error && file_lock->fl_type != F_UNLCK) {
+ if (!error && file_lock->fl_type != F_UNLCK &&
+ !(file_lock->fl_flags & FL_OFDLCK)) {
/*
* We need that spin_lock here - it prevents reordering between
* update of i_flctx->flc_posix and check for it done in

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