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staging: lustre: osc: set lock data for readahead lock

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If osc_io_readahead() finds a lock that belongs to the previous
instance of osc_object, the lock data pointer will be null. It has
to instantiate with new instance otherwise those pages won't be
destroyed at lock cancel, and then finally hit the assertion in
osc_req_attr_set().

This patch revised dlmlock_at_pgoff() to call osc_match_base() to
find caching locks for readahead. And new osc_object will be set
to the lock if it doesn't have one yet.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8005
Reviewed-on: http://review.whamcloud.com/19453
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jinshan Xiong 2016-12-02 19:53:27 -05:00 committed by Greg Kroah-Hartman
parent 29bdcd6725
commit 923dc82c61
3 changed files with 18 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/staging/lustre/lustre/osc/osc_io.c
View File

@ -88,6 +88,7 @@ static int osc_io_read_ahead(const struct lu_env *env,
dlmlock = osc_dlmlock_at_pgoff(env, osc, start, 0);
if (dlmlock) {
LASSERT(dlmlock->l_ast_data == osc);
if (dlmlock->l_req_mode != LCK_PR) {
struct lustre_handle lockh;

7
drivers/staging/lustre/lustre/osc/osc_lock.c
View File

@ -1205,10 +1205,9 @@ struct ldlm_lock *osc_dlmlock_at_pgoff(const struct lu_env *env,
* with a uniq gid and it conflicts with all other lock modes too
*/
again:
mode = ldlm_lock_match(osc_export(obj)->exp_obd->obd_namespace,
flags, resname, LDLM_EXTENT, policy,
LCK_PR | LCK_PW | LCK_GROUP, &lockh,
dap_flags & OSC_DAP_FL_CANCELING);
mode = osc_match_base(osc_export(obj), resname, LDLM_EXTENT, policy,
LCK_PR | LCK_PW | LCK_GROUP, &flags, obj, &lockh,
dap_flags & OSC_DAP_FL_CANCELING);
if (mode != 0) {
lock = ldlm_handle2lock(&lockh);
/* RACE: the lock is cancelled so let's try again */

49
drivers/staging/lustre/lustre/osc/osc_request.c
View File

@ -1813,16 +1813,11 @@ out:
return rc;
}
static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
struct ldlm_enqueue_info *einfo)
static int osc_set_lock_data(struct ldlm_lock *lock, void *data)
{
void *data = einfo->ei_cbdata;
int set = 0;
LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
LASSERT(lock->l_resource->lr_type == einfo->ei_type);
LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
LASSERT(lock);
lock_res_and_lock(lock);
@ -1836,21 +1831,6 @@ static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
return set;
}
static int osc_set_data_with_check(struct lustre_handle *lockh,
struct ldlm_enqueue_info *einfo)
{
struct ldlm_lock *lock = ldlm_handle2lock(lockh);
int set = 0;
if (lock) {
set = osc_set_lock_data_with_check(lock, einfo);
LDLM_LOCK_PUT(lock);
} else
CERROR("lockh %p, data %p - client evicted?\n",
lockh, einfo->ei_cbdata);
return set;
}
static int osc_enqueue_fini(struct ptlrpc_request *req,
osc_enqueue_upcall_f upcall, void *cookie,
struct lustre_handle *lockh, enum ldlm_mode mode,
@ -2016,7 +1996,7 @@ int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
ldlm_lock_decref(&lockh, mode);
LDLM_LOCK_PUT(matched);
return -ECANCELED;
} else if (osc_set_lock_data_with_check(matched, einfo)) {
} else if (osc_set_lock_data(matched, einfo->ei_cbdata)) {
*flags |= LDLM_FL_LVB_READY;
/* We already have a lock, and it's referenced. */
(*upcall)(cookie, &lockh, ELDLM_LOCK_MATCHED);
@ -2128,19 +2108,18 @@ int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
rc |= LCK_PW;
rc = ldlm_lock_match(obd->obd_namespace, lflags,
res_id, type, policy, rc, lockh, unref);
if (rc) {
if (data) {
if (!osc_set_data_with_check(lockh, data)) {
if (!(lflags & LDLM_FL_TEST_LOCK))
ldlm_lock_decref(lockh, rc);
return 0;
}
}
if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
ldlm_lock_addref(lockh, LCK_PR);
ldlm_lock_decref(lockh, LCK_PW);
}
if (!rc || lflags & LDLM_FL_TEST_LOCK)
return rc;
if (data) {
struct ldlm_lock *lock = ldlm_handle2lock(lockh);
LASSERT(lock);
if (!osc_set_lock_data(lock, data)) {
ldlm_lock_decref(lockh, rc);
rc = 0;
}
LDLM_LOCK_PUT(lock);
}
return rc;
}