From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Layton Subject: [PATCH v3 5/6] locks: report l_pid as -1 for FL_FILE_PVT locks Date: Tue, 10 Dec 2013 14:17:34 -0500 Message-ID: <1386703055-22308-6-git-send-email-jlayton@redhat.com> References: <1386703055-22308-1-git-send-email-jlayton@redhat.com> Cc: nfs-ganesha-devel@lists.sourceforge.net, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org To: linux-fsdevel@vger.kernel.org Return-path: In-Reply-To: <1386703055-22308-1-git-send-email-jlayton@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: samba-technical-bounces@lists.samba.org Errors-To: samba-technical-bounces@lists.samba.org List-Id: linux-fsdevel.vger.kernel.org FL_FILE_PVT locks are no longer tied to a particular pid, and are instead inheritable by child processes. Report a l_pid of '-1' for these sorts of locks since the pid is somewhat meaningless for them. This precedent comes from FreeBSD. There, POSIX and flock() locks can conflict with one another. If fcntl(F_GETLK, ...) returns a lock set with flock() then the l_pid member cannot be a process ID because the lock is not held by a process as such. Signed-off-by: Jeff Layton --- fs/locks.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/locks.c b/fs/locks.c index e163a30..5372ddd 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1899,7 +1899,7 @@ EXPORT_SYMBOL_GPL(vfs_test_lock); static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl) { - flock->l_pid = fl->fl_pid; + flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid; #if BITS_PER_LONG == 32 /* * Make sure we can represent the posix lock via @@ -1921,7 +1921,7 @@ static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl) #if BITS_PER_LONG == 32 static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl) { - flock->l_pid = fl->fl_pid; + flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid; flock->l_start = fl->fl_start; flock->l_len = fl->fl_end == OFFSET_MAX ? 0 : fl->fl_end - fl->fl_start + 1; -- 1.8.4.2