diff options
| author |   Andriy Skulysh <andriy.skulysh@seagate.com> | 2016-06-20 16:55:50 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-20 14:28:39 -0700 |
| commit | 025fd3c20bfb4e84972f174c7246f86d693f6544 (patch) | |
| tree | 0bb4acf98a915fcd4874430b18fc086803beda2f /drivers | |
| parent | staging/lustre: Add documentation for unstable_stats in sysfs (diff) | |
| download | wireguard-linux-025fd3c20bfb4e84972f174c7246f86d693f6544.tar.xz wireguard-linux-025fd3c20bfb4e84972f174c7246f86d693f6544.zip | |
staging/lustre/osc: glimpse lock should match only with granted locks
A deadlock is possible during ccc_prep_size()->ldlm_lock_match() vs
cl_io_lock() which is waiting for a matched lock and conflicts with
already taken lock before ccc_prep_size().
It is better to send an additional lock request to avoid deadlock.
Seagate-bug-id: MRP-3312
Signed-off-by: Andriy Skulysh <andriy.skulysh@seagate.com>
Reviewed-on: http://review.whamcloud.com/18738
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7829
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/lustre/lustre/osc/osc_request.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/staging/lustre/lustre/osc/osc_request.c b/drivers/staging/lustre/lustre/osc/osc_request.c index 933434946d5b..536b868ff776 100644 --- a/drivers/staging/lustre/lustre/osc/osc_request.c +++ b/drivers/staging/lustre/lustre/osc/osc_request.c @@ -2246,7 +2246,7 @@ int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id, struct lustre_handle lockh = { 0 }; struct ptlrpc_request *req = NULL; int intent = *flags & LDLM_FL_HAS_INTENT; - __u64 match_lvb = agl ? 0 : LDLM_FL_LVB_READY; + __u64 match_flags = *flags; enum ldlm_mode mode; int rc; @@ -2281,7 +2281,11 @@ int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id, mode = einfo->ei_mode; if (einfo->ei_mode == LCK_PR) mode |= LCK_PW; - mode = ldlm_lock_match(obd->obd_namespace, *flags | match_lvb, res_id, + if (agl == 0) + match_flags |= LDLM_FL_LVB_READY; + if (intent != 0) + match_flags |= LDLM_FL_BLOCK_GRANTED; + mode = ldlm_lock_match(obd->obd_namespace, match_flags, res_id, einfo->ei_type, policy, mode, &lockh, 0); if (mode) { struct ldlm_lock *matched; |