Commit 025fd3c2 authored by Andriy Skulysh's avatar Andriy Skulysh Committed by Greg Kroah-Hartman

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: default avatarAndriy Skulysh <>
Intel-bug-id: default avatarJinshan Xiong <>
Reviewed-by: default avatarBobi Jam <>
Signed-off-by: default avatarOleg Drokin <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent cb96191f
......@@ -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;
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