From 1cf8e5de4055f85383405a21a0a7c3c4348bf2ed Mon Sep 17 00:00:00 2001 From: Konstantin Khorenko Date: Fri, 8 Jun 2018 17:27:12 +0300 Subject: fs/lock: show locks taken by processes from another pidns Currently if we face a lock taken by a process invisible in the current pidns we skip the lock completely, but this 1) makes the output not that nice (root@vz7)/: cat /proc/${PID_A2}/fdinfo/3 pos: 4 flags: 02100002 mnt_id: 257 lock: (root@vz7)/: 2) makes it more difficult to debug issues with leaked flocks if you get error on lock, but don't see any locks in /proc/$id/fdinfo/$file Let's show information about such locks again as previously, but show zero in the owner pid field. After the patch: =============== (root@vz7)/:cat /proc/${PID_A2}/fdinfo/3 pos: 4 flags: 02100002 mnt_id: 295 lock: 1: FLOCK ADVISORY WRITE 0 b6:f8a61:529946 0 EOF Fixes: 9d5b86ac13c5 ("fs/locks: Remove fl_nspid and use fs-specific l_pid for remote locks") Signed-off-by: Konstantin Khorenko Acked-by: Andrey Vagin Reviewed-by: Benjamin Coddington Signed-off-by: Jeff Layton --- fs/locks.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'fs/locks.c') diff --git a/fs/locks.c b/fs/locks.c index bfee5b7f2862..e533623e2e99 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -2633,12 +2633,10 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl, fl_pid = locks_translate_pid(fl, proc_pidns); /* - * If there isn't a fl_pid don't display who is waiting on - * the lock if we are called from locks_show, or if we are - * called from __show_fd_info - skip lock entirely + * If lock owner is dead (and pid is freed) or not visible in current + * pidns, zero is shown as a pid value. Check lock info from + * init_pid_ns to get saved lock pid value. */ - if (fl_pid == 0) - return; if (fl->fl_file != NULL) inode = locks_inode(fl->fl_file); -- cgit v1.2.3