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- Log -----------------------------------------------------------------
commit 1c9932d3cc533daedac7cfb3a50b7d6ff8d07990
Author: David Teigland <teigland@redhat.com>
Date: Thu Feb 28 09:49:26 2008 -0600

lock_dlm: skip busy plocks in unlock

bz 432707

Another problem with multiple threads manipulating the same
plocks (also see bz 383391). In this case thread1 was waiting
on a plock that was in the dlm, when thread2 came and tried to
unlock it (due to the process exiting and closing all files).
dlm returns EBUSY for the unlock, which causes lock_dlm to assert
(another work around could be to just not assert on EBUSY.)
The "busy" flag was recently added to plocks to work around
another similar problem with multiple threads; use that to
just skip the unlock on any plock that's busy.

4.6.z bz#440665

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

Summary of changes:
gfs-kernel/src/dlm/plock.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/gfs-kernel/src/dlm/plock.c b/gfs-kernel/src/dlm/plock.c
index bc4cfc4..e1bc46d 100644
--- a/gfs-kernel/src/dlm/plock.c
+++ b/gfs-kernel/src/dlm/plock.c
@@ -833,6 +833,8 @@ static int punlock_internal(struct dlm_resource *r, unsigned long owner,
list_for_each_entry_safe(po, safe, &r->locks, list) {
if (po->owner != owner)
continue;
+ if (po->busy)
+ continue;
if (!ranges_overlap(po->start, po->end, start, end))
continue;



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