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authorJeff Layton <jlayton@redhat.com>2014-04-15 08:44:12 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-13 14:11:31 +0200
commit08f36d9d2cbe95df935378c220215791fc1dd111 (patch)
tree5789ef0e64f0251484a83a44854cd728cc2f3409
parente45d91ae6e931aec803c5cbbe36b53e64c3e3077 (diff)
locks: allow __break_lease to sleep even when break_time is 0
commit 4991a628a789dc5954e98e79476d9808812292ec upstream. A fl->fl_break_time of 0 has a special meaning to the lease break code that basically means "never break the lease". knfsd uses this to ensure that leases don't disappear out from under it. Unfortunately, the code in __break_lease can end up passing this value to wait_event_interruptible as a timeout, which prevents it from going to sleep at all. This causes __break_lease to spin in a tight loop and causes soft lockups. Fix this by ensuring that we pass a minimum value of 1 as a timeout instead. Cc: J. Bruce Fields <bfields@fieldses.org> Reported-by: Terry Barnaby <terry1@beam.ltd.uk> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/locks.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/locks.c b/fs/locks.c
index fcc50ab71cc6..d4f1d89d9bc6 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1253,11 +1253,10 @@ int __break_lease(struct inode *inode, unsigned int mode)
restart:
break_time = flock->fl_break_time;
- if (break_time != 0) {
+ if (break_time != 0)
break_time -= jiffies;
- if (break_time == 0)
- break_time++;
- }
+ if (break_time == 0)
+ break_time++;
locks_insert_block(flock, new_fl);
unlock_flocks();
error = wait_event_interruptible_timeout(new_fl->fl_wait,