1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/osc/osc_create.c
37 * For testing and management it is treated as an obd_device,
38 * although * it does not export a full OBD method table (the
39 * requests are coming * in over the wire, so object target modules
40 * do not have a full * method table.)
42 * Author: Peter Braam <braam@clusterfs.com>
46 # define EXPORT_SYMTAB
48 #define DEBUG_SUBSYSTEM S_OSC
51 # include <libcfs/libcfs.h>
52 #else /* __KERNEL__ */
53 # include <liblustre.h>
60 #include <lustre_dlm.h>
61 #include <obd_class.h>
62 #include "osc_internal.h"
64 /* XXX need AT adjust ? */
65 #define osc_create_timeout (obd_timeout / 2)
67 struct osc_create_async_args {
68 struct osc_creator *rq_oscc;
69 struct lov_stripe_md *rq_lsm;
70 struct obd_info *rq_oinfo;
73 static int oscc_internal_create(struct osc_creator *oscc);
74 static int handle_async_create(struct ptlrpc_request *req, int rc);
76 static int osc_interpret_create(const struct lu_env *env,
77 struct ptlrpc_request *req, void *data, int rc)
79 struct osc_creator *oscc;
80 struct ost_body *body = NULL;
81 struct ptlrpc_request *fake_req, *pos;
85 body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
86 if (body == NULL && rc == 0)
90 oscc = req->rq_async_args.pointer_arg[0];
91 LASSERT(oscc && (oscc->oscc_obd != LP_POISON));
93 cfs_spin_lock(&oscc->oscc_lock);
94 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
98 int diff =ostid_id(&body->oa.o_oi)- oscc->oscc_last_id;
100 /* oscc_internal_create() stores the original value of
101 * grow_count in rq_async_args.space[0].
102 * We can't compare against oscc_grow_count directly,
103 * because it may have been increased while the RPC
104 * is in flight, so we would always find ourselves
105 * having created fewer objects and decreasing the
106 * precreate request size. b=18577 */
107 if (diff < (int) req->rq_async_args.space[0]) {
108 /* the OST has not managed to create all the
109 * objects we asked for */
110 oscc->oscc_grow_count = max(diff,
112 /* don't bump grow_count next time */
113 oscc->oscc_flags |= OSCC_FLAG_LOW;
115 /* the OST is able to keep up with the work,
116 * we could consider increasing grow_count
117 * next time if needed */
118 oscc->oscc_flags &= ~OSCC_FLAG_LOW;
120 oscc->oscc_last_id = ostid_id(&body->oa.o_oi);
122 cfs_spin_unlock(&oscc->oscc_lock);
126 oscc->oscc_flags |= OSCC_FLAG_RDONLY;
130 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
131 if (body && rc == -ENOSPC) {
132 oscc->oscc_last_id = body->oa.o_id;
133 oscc->oscc_grow_count = OST_MIN_PRECREATE;
136 cfs_spin_unlock(&oscc->oscc_lock);
137 DEBUG_REQ(D_INODE, req, "OST out of space, flagging");
140 /* filter always set body->oa.o_id as the last_id
141 * of filter (see filter_handle_precreate for detail)*/
142 if (body && body->oa.o_id > oscc->oscc_last_id)
143 oscc->oscc_last_id = body->oa.o_id;
144 cfs_spin_unlock(&oscc->oscc_lock);
149 /* aka EAGAIN we should not delay create if import failed -
150 * this avoid client stick in create and avoid race with
152 /* EINTR say - old create request is killed due mds<>ost
153 * eviction - OSCC_FLAG_RECOVERING can already set due
154 * IMP_DISCONN event */
155 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
156 /* oscc->oscc_grow_count = OST_MIN_PRECREATE; */
157 cfs_spin_unlock(&oscc->oscc_lock);
161 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
162 oscc->oscc_grow_count = OST_MIN_PRECREATE;
163 cfs_spin_unlock(&oscc->oscc_lock);
164 DEBUG_REQ(D_ERROR, req,
165 "Unknown rc %d from async create: failing oscc", rc);
166 ptlrpc_fail_import(req->rq_import,
167 lustre_msg_get_conn_cnt(req->rq_reqmsg));
171 CDEBUG(D_HA, "preallocated through id "LPU64" (next to use "LPU64")\n",
172 oscc->oscc_last_id, oscc->oscc_next_id);
174 cfs_spin_lock(&oscc->oscc_lock);
175 cfs_list_for_each_entry_safe(fake_req, pos,
176 &oscc->oscc_wait_create_list, rq_list) {
177 if (handle_async_create(fake_req, rc) == -EAGAIN) {
178 oscc_internal_create(oscc);
179 /* sending request should be never fail because
180 * osc use preallocated requests pool */
181 GOTO(exit_wakeup, rc);
184 cfs_spin_unlock(&oscc->oscc_lock);
187 cfs_waitq_signal(&oscc->oscc_waitq);
191 static int oscc_internal_create(struct osc_creator *oscc)
193 struct ptlrpc_request *request;
194 struct ost_body *body;
197 LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
199 /* Do not check for a degraded OST here - bug21563/bug18539 */
200 if (oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
201 cfs_spin_unlock(&oscc->oscc_lock);
205 /* we need check it before OSCC_FLAG_CREATING - because need
206 * see lower number of precreate objects */
207 if (oscc->oscc_grow_count < oscc->oscc_max_grow_count &&
208 ((oscc->oscc_flags & OSCC_FLAG_LOW) == 0) &&
209 (__s64)(oscc->oscc_last_id - oscc->oscc_next_id) <=
210 (oscc->oscc_grow_count / 4 + 1)) {
211 oscc->oscc_flags |= OSCC_FLAG_LOW;
212 oscc->oscc_grow_count *= 2;
215 if (oscc->oscc_flags & OSCC_FLAG_CREATING) {
216 cfs_spin_unlock(&oscc->oscc_lock);
220 if (oscc->oscc_grow_count > oscc->oscc_max_grow_count / 2)
221 oscc->oscc_grow_count = oscc->oscc_max_grow_count / 2;
223 oscc->oscc_flags |= OSCC_FLAG_CREATING;
224 cfs_spin_unlock(&oscc->oscc_lock);
226 request = ptlrpc_request_alloc_pack(oscc->oscc_obd->u.cli.cl_import,
228 LUSTRE_OST_VERSION, OST_CREATE);
229 if (request == NULL) {
230 cfs_spin_lock(&oscc->oscc_lock);
231 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
232 cfs_spin_unlock(&oscc->oscc_lock);
236 request->rq_request_portal = OST_CREATE_PORTAL;
237 ptlrpc_at_set_req_timeout(request);
238 body = req_capsule_client_get(&request->rq_pill, &RMF_OST_BODY);
240 cfs_spin_lock(&oscc->oscc_lock);
242 if (likely(fid_seq_is_mdt(oscc->oscc_oa.o_seq))) {
243 body->oa.o_oi.oi_seq = oscc->oscc_oa.o_seq;
244 body->oa.o_oi.oi_id = oscc->oscc_last_id +
245 oscc->oscc_grow_count;
247 /*Just warning here currently, since not sure how fid-on-ost
248 *will be implemented here */
249 CWARN("o_seq: "LPU64" is not indicate any MDTs.\n",
250 oscc->oscc_oa.o_seq);
253 body->oa.o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
254 request->rq_async_args.space[0] = oscc->oscc_grow_count;
255 cfs_spin_unlock(&oscc->oscc_lock);
256 CDEBUG(D_RPCTRACE, "prealloc through id "LPU64" (last seen "LPU64")\n",
257 body->oa.o_id, oscc->oscc_last_id);
259 /* we should not resend create request - anyway we will have delorphan
260 * and kill these objects */
261 request->rq_no_delay = request->rq_no_resend = 1;
262 ptlrpc_request_set_replen(request);
264 request->rq_async_args.pointer_arg[0] = oscc;
265 request->rq_interpret_reply = osc_interpret_create;
266 ptlrpcd_add_req(request, PSCOPE_OTHER);
271 static int oscc_has_objects_nolock(struct osc_creator *oscc, int count)
273 return ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
277 static int oscc_has_objects(struct osc_creator *oscc, int count)
281 cfs_spin_lock(&oscc->oscc_lock);
282 have_objs = oscc_has_objects_nolock(oscc, count);
283 cfs_spin_unlock(&oscc->oscc_lock);
288 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
293 ost_unusable = oscc->oscc_obd->u.cli.cl_import->imp_invalid;
295 cfs_spin_lock(&oscc->oscc_lock);
296 ost_unusable |= (OSCC_FLAG_NOSPC | OSCC_FLAG_RDONLY |
297 OSCC_FLAG_EXITING) & oscc->oscc_flags;
298 have_objs = oscc_has_objects_nolock(oscc, count);
300 if (!ost_unusable && !have_objs)
301 /* they release lock himself */
302 have_objs = oscc_internal_create(oscc);
304 cfs_spin_unlock(&oscc->oscc_lock);
306 return have_objs || ost_unusable;
309 static int oscc_precreate(struct osc_creator *oscc)
311 struct l_wait_info lwi;
315 if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
318 /* we should be not block forever - because client's create rpc can
319 * stick in mds for long time and forbid client reconnect */
320 lwi = LWI_TIMEOUT(cfs_timeout_cap(cfs_time_seconds(osc_create_timeout)),
323 rc = l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
327 static int oscc_in_sync(struct osc_creator *oscc)
331 cfs_spin_lock(&oscc->oscc_lock);
332 sync = oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS;
333 cfs_spin_unlock(&oscc->oscc_lock);
338 /* decide if the OST has remaining object, return value :
339 0 : the OST has remaining object, and don't need to do precreate.
340 1 : the OST has no remaining object, and will send a RPC for precreate.
341 2 : the OST has no remaining object, and will not get any for
342 a potentially very long time
345 int osc_precreate(struct obd_export *exp)
347 struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
348 struct obd_import *imp = exp->exp_imp_reverse;
351 LASSERT(oscc != NULL);
352 if (imp != NULL && imp->imp_deactive)
355 /* Handle critical states first */
356 cfs_spin_lock(&oscc->oscc_lock);
357 if (oscc->oscc_flags & OSCC_FLAG_NOSPC ||
358 oscc->oscc_flags & OSCC_FLAG_RDONLY ||
359 oscc->oscc_flags & OSCC_FLAG_EXITING) {
360 cfs_spin_unlock(&oscc->oscc_lock);
364 if ((oscc->oscc_flags & OSCC_FLAG_RECOVERING) ||
365 (oscc->oscc_flags & OSCC_FLAG_DEGRADED)) {
366 cfs_spin_unlock(&oscc->oscc_lock);
370 if (oscc_has_objects_nolock(oscc, oscc->oscc_grow_count / 2)) {
371 cfs_spin_unlock(&oscc->oscc_lock);
375 /* Do not check for OSCC_FLAG_CREATING flag here, let
376 * osc_precreate() call oscc_internal_create() and
377 * adjust oscc_grow_count bug21563 */
378 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
379 cfs_spin_unlock(&oscc->oscc_lock);
383 if (oscc_internal_create(oscc))
388 static int handle_async_create(struct ptlrpc_request *req, int rc)
390 struct osc_create_async_args *args = ptlrpc_req_async_args(req);
391 struct osc_creator *oscc = args->rq_oscc;
392 struct lov_stripe_md *lsm = args->rq_lsm;
393 struct obd_info *oinfo = args->rq_oinfo;
394 struct obdo *oa = oinfo->oi_oa;
396 LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
401 /* Handle the critical type errors first.
402 * Should we also test cl_import state as well ? */
403 if (oscc->oscc_flags & OSCC_FLAG_EXITING)
404 GOTO(out_wake, rc = -EIO);
406 if (oscc->oscc_flags & OSCC_FLAG_NOSPC)
407 GOTO(out_wake, rc = -ENOSPC);
409 if (oscc->oscc_flags & OSCC_FLAG_RDONLY)
410 GOTO(out_wake, rc = -EROFS);
412 /* should be try wait until recovery finished */
413 if((oscc->oscc_flags & OSCC_FLAG_RECOVERING) ||
414 (oscc->oscc_flags & OSCC_FLAG_DEGRADED))
417 if (oscc_has_objects_nolock(oscc, 1)) {
418 memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
419 oa->o_id = oscc->oscc_next_id;
420 lsm->lsm_object_id = oscc->oscc_next_id;
421 oscc->oscc_next_id++;
423 CDEBUG(D_RPCTRACE, " set oscc_next_id = "LPU64"\n",
425 GOTO(out_wake, rc = 0);
428 /* we don't have objects now - continue wait */
433 rc = oinfo->oi_cb_up(oinfo, rc);
434 ptlrpc_fakereq_finished(req);
439 static int async_create_interpret(const struct lu_env *env,
440 struct ptlrpc_request *req, void *data,
443 struct osc_create_async_args *args = ptlrpc_req_async_args(req);
444 struct osc_creator *oscc = args->rq_oscc;
447 cfs_spin_lock(&oscc->oscc_lock);
448 ret = handle_async_create(req, rc);
449 cfs_spin_unlock(&oscc->oscc_lock);
454 int osc_create_async(struct obd_export *exp, struct obd_info *oinfo,
455 struct lov_stripe_md **ea, struct obd_trans_info *oti)
458 struct ptlrpc_request *fake_req;
459 struct osc_create_async_args *args;
460 struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
461 struct obdo *oa = oinfo->oi_oa;
464 if ((oa->o_valid & OBD_MD_FLGROUP) && !fid_seq_is_mdt(oa->o_seq)) {
465 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
466 rc = oinfo->oi_cb_up(oinfo, rc);
470 if ((oa->o_valid & OBD_MD_FLFLAGS) &&
471 oa->o_flags == OBD_FL_RECREATE_OBJS) {
472 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
473 rc = oinfo->oi_cb_up(oinfo, rc);
477 LASSERT((*ea) != NULL);
479 fake_req = ptlrpc_prep_fakereq(oscc->oscc_obd->u.cli.cl_import,
481 async_create_interpret);
482 if (fake_req == NULL) {
483 rc = oinfo->oi_cb_up(oinfo, -ENOMEM);
487 args = ptlrpc_req_async_args(fake_req);
488 CLASSERT(sizeof(*args) <= sizeof(fake_req->rq_async_args));
490 args->rq_oscc = oscc;
492 args->rq_oinfo = oinfo;
494 cfs_spin_lock(&oscc->oscc_lock);
496 rc = handle_async_create(fake_req, 0);
499 /* we not have objects - try wait */
500 is_add = ptlrpcd_add_req(fake_req, PSCOPE_OTHER);
502 cfs_list_add(&fake_req->rq_list,
503 &oscc->oscc_wait_create_list);
507 cfs_spin_unlock(&oscc->oscc_lock);
510 /* need free request if was error hit or
511 * objects already allocated */
512 ptlrpc_req_finished(fake_req);
514 /* EAGAIN mean - request is delayed */
520 int osc_create(struct obd_export *exp, struct obdo *oa,
521 struct lov_stripe_md **ea, struct obd_trans_info *oti)
523 struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
524 struct obd_import *imp = exp->exp_obd->u.cli.cl_import;
525 struct lov_stripe_md *lsm;
526 int del_orphan = 0, rc = 0;
531 LASSERT(oa->o_valid & OBD_MD_FLGROUP);
533 if ((oa->o_valid & OBD_MD_FLFLAGS) &&
534 oa->o_flags == OBD_FL_RECREATE_OBJS) {
535 RETURN(osc_real_create(exp, oa, ea, oti));
538 if (!fid_seq_is_mdt(oa->o_seq))
539 RETURN(osc_real_create(exp, oa, ea, oti));
541 /* this is the special case where create removes orphans */
542 if (oa->o_valid & OBD_MD_FLFLAGS &&
543 oa->o_flags == OBD_FL_DELORPHAN) {
544 cfs_spin_lock(&oscc->oscc_lock);
545 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
546 cfs_spin_unlock(&oscc->oscc_lock);
549 if (!(oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
550 cfs_spin_unlock(&oscc->oscc_lock);
554 oscc->oscc_flags |= OSCC_FLAG_SYNC_IN_PROGRESS;
555 /* seting flag LOW we prevent extra grow precreate size
556 * and enforce use last assigned size */
557 oscc->oscc_flags |= OSCC_FLAG_LOW;
558 cfs_spin_unlock(&oscc->oscc_lock);
559 CDEBUG(D_HA, "%s: oscc recovery started - delete to "LPU64"\n",
560 oscc->oscc_obd->obd_name, oscc->oscc_next_id - 1);
564 /* delete from next_id on up */
565 oa->o_valid |= OBD_MD_FLID;
566 oa->o_id = oscc->oscc_next_id - 1;
568 rc = osc_real_create(exp, oa, ea, NULL);
570 cfs_spin_lock(&oscc->oscc_lock);
571 oscc->oscc_flags &= ~OSCC_FLAG_SYNC_IN_PROGRESS;
572 if (rc == 0 || rc == -ENOSPC) {
573 struct obd_connect_data *ocd;
576 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
577 oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
579 oscc->oscc_last_id = oa->o_id;
580 ocd = &imp->imp_connect_data;
581 if (ocd->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN) {
582 CDEBUG(D_HA, "%s: Skip orphan set, reset last "
583 "objid\n", oscc->oscc_obd->obd_name);
584 oscc->oscc_next_id = oa->o_id + 1;
587 /* sanity check for next objid. see bug 17025 */
588 LASSERT(oscc->oscc_next_id == oa->o_id + 1);
590 CDEBUG(D_HA, "%s: oscc recovery finished, last_id: "
591 LPU64", rc: %d\n", oscc->oscc_obd->obd_name,
592 oscc->oscc_last_id, rc);
594 CDEBUG(D_ERROR, "%s: oscc recovery failed: %d\n",
595 oscc->oscc_obd->obd_name, rc);
598 cfs_waitq_signal(&oscc->oscc_waitq);
599 cfs_spin_unlock(&oscc->oscc_lock);
607 rc = obd_alloc_memmd(exp, &lsm);
613 if (oscc_in_sync(oscc))
614 CDEBUG(D_HA,"%s: oscc recovery in progress, waiting\n",
615 oscc->oscc_obd->obd_name);
617 rc = oscc_precreate(oscc);
619 CDEBUG(D_HA,"%s: error create %d\n",
620 oscc->oscc_obd->obd_name, rc);
622 cfs_spin_lock(&oscc->oscc_lock);
624 /* wakeup but recovery did not finished */
625 if ((oscc->oscc_obd->u.cli.cl_import->imp_invalid) ||
626 (oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
628 cfs_spin_unlock(&oscc->oscc_lock);
632 if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
634 cfs_spin_unlock(&oscc->oscc_lock);
638 if (oscc->oscc_flags & OSCC_FLAG_RDONLY) {
640 cfs_spin_unlock(&oscc->oscc_lock);
644 // Should we report -EIO error ?
645 if (oscc->oscc_flags & OSCC_FLAG_EXITING) {
646 cfs_spin_unlock(&oscc->oscc_lock);
651 * If this is DELORPHAN process, no need create object here,
652 * otherwise this will create a gap of object id, and MDS
653 * might create some orphan log (mds_lov_update_objids), then
654 * remove objects wrongly on OST. Bug 21379.
656 if (oa->o_valid & OBD_MD_FLFLAGS &&
657 oa->o_flags == OBD_FL_DELORPHAN) {
658 cfs_spin_unlock(&oscc->oscc_lock);
662 if (oscc_has_objects_nolock(oscc, 1)) {
663 memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
664 oa->o_id = oscc->oscc_next_id;
665 lsm->lsm_object_id = oscc->oscc_next_id;
667 oscc->oscc_next_id++;
668 cfs_spin_unlock(&oscc->oscc_lock);
670 CDEBUG(D_RPCTRACE, "%s: set oscc_next_id = "LPU64"\n",
671 exp->exp_obd->obd_name, oscc->oscc_next_id);
675 cfs_spin_unlock(&oscc->oscc_lock);
679 CDEBUG(D_INFO, "%s: returning objid "LPU64"\n",
680 obd2cli_tgt(oscc->oscc_obd), lsm->lsm_object_id);
683 obd_free_memmd(exp, &lsm);
684 if (del_orphan != 0 && rc != -EIO)
685 /* Ignore non-IO precreate error for clear orphan */
691 void oscc_init(struct obd_device *obd)
693 struct osc_creator *oscc;
698 oscc = &obd->u.cli.cl_oscc;
700 memset(oscc, 0, sizeof(*oscc));
702 cfs_waitq_init(&oscc->oscc_waitq);
703 cfs_spin_lock_init(&oscc->oscc_lock);
704 oscc->oscc_obd = obd;
705 oscc->oscc_grow_count = OST_MIN_PRECREATE;
706 oscc->oscc_max_grow_count = OST_MAX_PRECREATE;
708 oscc->oscc_next_id = 2;
709 oscc->oscc_last_id = 1;
710 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
712 CFS_INIT_LIST_HEAD(&oscc->oscc_wait_create_list);
714 /* XXX the export handle should give the oscc the last object */
715 /* oed->oed_oscc.oscc_last_id = exph->....; */
718 void oscc_fini(struct obd_device *obd)
720 struct osc_creator *oscc = &obd->u.cli.cl_oscc;
724 cfs_spin_lock(&oscc->oscc_lock);
725 oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
726 oscc->oscc_flags |= OSCC_FLAG_EXITING;
727 cfs_spin_unlock(&oscc->oscc_lock);