diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2013-10-16 14:20:25 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-05-05 15:21:59 +0200 |
| commit | 7aa1bde8f6143b2db33e6567a8c3a4debaa246f4 (patch) | |
| tree | 6ed593c0b6b2e7b207c78c690fe972c8d0a66281 | |
| parent | 3756888c2a2da9c7291d39cacd1184171111b49d (diff) | |
dlm: Avoid that dlm_release_lockspace() incorrectly returns -EBUSY
commit a97f4a66d8ee4faf0f31cc4ad3f4aa0baef23fc7 upstream.
When dlm_release_lockspace(ls, 1) is invoked on a busy system
immediately after the last dlm_unlock() AST has finished it can occur
that lkb_idr_is_local() is invoked for the unlocked LKB since removal
from ls_lkbidr only occurs after the AST has returned. If that happens
dlm_release_lockspace(ls, 1) will return -EBUSY instead of releasing
the lockspace. Fix this race condition by changing lkb_idr_is_local()
such that it only returns true for LKB's that have not yet been
unlocked.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | fs/dlm/lockspace.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c index 88556dc0458..d5abafd56a6 100644 --- a/fs/dlm/lockspace.c +++ b/fs/dlm/lockspace.c @@ -706,9 +706,7 @@ static int lkb_idr_is_local(int id, void *p, void *data) { struct dlm_lkb *lkb = p; - if (!lkb->lkb_nodeid) - return 1; - return 0; + return lkb->lkb_nodeid == 0 && lkb->lkb_grmode != DLM_LOCK_IV; } static int lkb_idr_is_any(int id, void *p, void *data) |