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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_io for OSC layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
42 #define DEBUG_SUBSYSTEM S_OSC
44 #include "osc_cl_internal.h"
50 /*****************************************************************************
56 static struct osc_req *cl2osc_req(const struct cl_req_slice *slice)
58 LINVRNT(slice->crs_dev->cd_lu_dev.ld_type == &osc_device_type);
59 return container_of0(slice, struct osc_req, or_cl);
62 static struct osc_io *cl2osc_io(const struct lu_env *env,
63 const struct cl_io_slice *slice)
65 struct osc_io *oio = container_of0(slice, struct osc_io, oi_cl);
67 LINVRNT(oio == osc_env_io(env));
71 static struct osc_page *osc_cl_page_osc(struct cl_page *page)
73 const struct cl_page_slice *slice;
75 slice = cl_page_at(page, &osc_device_type);
76 LASSERT(slice != NULL);
78 return cl2osc_page(slice);
82 /*****************************************************************************
88 static void osc_io_fini(const struct lu_env *env, const struct cl_io_slice *io)
93 * An implementation of cl_io_operations::cio_io_submit() method for osc
94 * layer. Iterates over pages in the in-queue, prepares each for io by calling
95 * cl_page_prep() and then either submits them through osc_io_submit_page()
96 * or, if page is already submitted, changes osc flags through
97 * osc_set_async_flags().
99 static int osc_io_submit(const struct lu_env *env,
100 const struct cl_io_slice *ios,
101 enum cl_req_type crt, struct cl_2queue *queue)
103 struct cl_page *page;
105 struct client_obd *cli = NULL;
106 struct osc_object *osc = NULL; /* to keep gcc happy */
107 struct osc_page *opg;
111 struct cl_page_list *qin = &queue->c2_qin;
112 struct cl_page_list *qout = &queue->c2_qout;
119 LASSERT(qin->pl_nr > 0);
121 CDEBUG(D_CACHE, "%d %d\n", qin->pl_nr, crt);
123 osc = cl2osc(ios->cis_obj);
125 max_pages = cli->cl_max_pages_per_rpc;
127 cmd = crt == CRT_WRITE ? OBD_BRW_WRITE : OBD_BRW_READ;
128 brw_flags = osc_io_srvlock(cl2osc_io(env, ios)) ? OBD_BRW_SRVLOCK : 0;
131 * NOTE: here @page is a top-level page. This is done to avoid
132 * creation of sub-page-list.
134 cl_page_list_for_each_safe(page, tmp, qin) {
135 struct osc_async_page *oap;
141 opg = osc_cl_page_osc(page);
143 LASSERT(osc == oap->oap_obj);
145 if (!list_empty(&oap->oap_pending_item) ||
146 !list_empty(&oap->oap_rpc_item)) {
147 CDEBUG(D_CACHE, "Busy oap %p page %p for submit.\n",
153 result = cl_page_prep(env, io, page, crt);
156 if (result != -EALREADY)
159 * Handle -EALREADY error: for read case, the page is
160 * already in UPTODATE state; for write, the page
167 cl_page_list_move(qout, qin, page);
168 oap->oap_async_flags = ASYNC_URGENT|ASYNC_READY;
169 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
171 osc_page_submit(env, opg, crt, brw_flags);
172 list_add_tail(&oap->oap_pending_item, &list);
173 if (++queued == max_pages) {
175 result = osc_queue_sync_pages(env, osc, &list, cmd,
183 result = osc_queue_sync_pages(env, osc, &list, cmd, brw_flags);
185 CDEBUG(D_INFO, "%d/%d %d\n", qin->pl_nr, qout->pl_nr, result);
186 return qout->pl_nr > 0 ? 0 : result;
189 static void osc_page_touch_at(const struct lu_env *env,
190 struct cl_object *obj, pgoff_t idx, unsigned to)
192 struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
193 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
197 /* offset within stripe */
198 kms = cl_offset(obj, idx) + to;
200 cl_object_attr_lock(obj);
204 * ll_inode_size_lock(inode, 0); lov_stripe_lock(lsm);
208 CDEBUG(D_INODE, "stripe KMS %sincreasing %llu->%llu %llu\n",
209 kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms,
210 loi->loi_lvb.lvb_size);
213 if (kms > loi->loi_kms) {
217 if (kms > loi->loi_lvb.lvb_size) {
218 attr->cat_size = kms;
221 cl_object_attr_set(env, obj, attr, valid);
222 cl_object_attr_unlock(obj);
226 * This is called when a page is accessed within file in a way that creates
227 * new page, if one were missing (i.e., if there were a hole at that place in
228 * the file, or accessed page is beyond the current file size). Examples:
229 * ->commit_write() and ->nopage() methods.
231 * Expand stripe KMS if necessary.
233 static void osc_page_touch(const struct lu_env *env,
234 struct osc_page *opage, unsigned to)
236 struct cl_page *page = opage->ops_cl.cpl_page;
237 struct cl_object *obj = opage->ops_cl.cpl_obj;
239 osc_page_touch_at(env, obj, page->cp_index, to);
243 * Implements cl_io_operations::cio_prepare_write() method for osc layer.
245 * \retval -EIO transfer initiated against this osc will most likely fail
246 * \retval 0 transfer initiated against this osc will most likely succeed.
248 * The reason for this check is to immediately return an error to the caller
249 * in the case of a deactivated import. Note, that import can be deactivated
250 * later, while pages, dirtied by this IO, are still in the cache, but this is
251 * irrelevant, because that would still return an error to the application (if
252 * it does fsync), but many applications don't do fsync because of performance
253 * issues, and we wanted to return an -EIO at write time to notify the
256 static int osc_io_prepare_write(const struct lu_env *env,
257 const struct cl_io_slice *ios,
258 const struct cl_page_slice *slice,
259 unsigned from, unsigned to)
261 struct osc_device *dev = lu2osc_dev(slice->cpl_obj->co_lu.lo_dev);
262 struct obd_import *imp = class_exp2cliimp(dev->od_exp);
263 struct osc_io *oio = cl2osc_io(env, ios);
267 * This implements OBD_BRW_CHECK logic from old client.
270 if (imp == NULL || imp->imp_invalid)
272 if (result == 0 && oio->oi_lockless)
273 /* this page contains `invalid' data, but who cares?
274 * nobody can access the invalid data.
275 * in osc_io_commit_write(), we're going to write exact
276 * [from, to) bytes of this page to OST. -jay */
277 cl_page_export(env, slice->cpl_page, 1);
282 static int osc_io_commit_write(const struct lu_env *env,
283 const struct cl_io_slice *ios,
284 const struct cl_page_slice *slice,
285 unsigned from, unsigned to)
287 struct osc_io *oio = cl2osc_io(env, ios);
288 struct osc_page *opg = cl2osc_page(slice);
289 struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
290 struct osc_async_page *oap = &opg->ops_oap;
294 * XXX instead of calling osc_page_touch() here and in
295 * osc_io_fault_start() it might be more logical to introduce
296 * cl_page_touch() method, that generic cl_io_commit_write() and page
299 osc_page_touch(env, cl2osc_page(slice), to);
300 if (!client_is_remote(osc_export(obj)) &&
301 capable(CFS_CAP_SYS_RESOURCE))
302 oap->oap_brw_flags |= OBD_BRW_NOQUOTA;
304 if (oio->oi_lockless)
305 /* see osc_io_prepare_write() for lockless io handling. */
306 cl_page_clip(env, slice->cpl_page, from, to);
311 static int osc_io_fault_start(const struct lu_env *env,
312 const struct cl_io_slice *ios)
315 struct cl_fault_io *fio;
318 fio = &io->u.ci_fault;
319 CDEBUG(D_INFO, "%lu %d %d\n",
320 fio->ft_index, fio->ft_writable, fio->ft_nob);
322 * If mapping is writeable, adjust kms to cover this page,
323 * but do not extend kms beyond actual file size.
326 if (fio->ft_writable)
327 osc_page_touch_at(env, ios->cis_obj,
328 fio->ft_index, fio->ft_nob);
332 static int osc_async_upcall(void *a, int rc)
334 struct osc_async_cbargs *args = a;
337 complete(&args->opc_sync);
342 * Checks that there are no pages being written in the extent being truncated.
344 static int trunc_check_cb(const struct lu_env *env, struct cl_io *io,
345 struct cl_page *page, void *cbdata)
347 const struct cl_page_slice *slice;
348 struct osc_page *ops;
349 struct osc_async_page *oap;
350 __u64 start = *(__u64 *)cbdata;
352 slice = cl_page_at(page, &osc_device_type);
353 LASSERT(slice != NULL);
354 ops = cl2osc_page(slice);
357 if (oap->oap_cmd & OBD_BRW_WRITE &&
358 !list_empty(&oap->oap_pending_item))
359 CL_PAGE_DEBUG(D_ERROR, env, page, "exists %llu/%s.\n",
360 start, current->comm);
363 struct page *vmpage = cl_page_vmpage(env, page);
365 if (PageLocked(vmpage))
366 CDEBUG(D_CACHE, "page %p index %lu locked for %d.\n",
368 (oap->oap_cmd & OBD_BRW_RWMASK));
371 return CLP_GANG_OKAY;
374 static void osc_trunc_check(const struct lu_env *env, struct cl_io *io,
375 struct osc_io *oio, __u64 size)
377 struct cl_object *clob;
381 clob = oio->oi_cl.cis_obj;
382 start = cl_index(clob, size);
383 partial = cl_offset(clob, start) < size;
386 * Complain if there are pages in the truncated region.
388 cl_page_gang_lookup(env, clob, io, start + partial, CL_PAGE_EOF,
389 trunc_check_cb, (void *)&size);
392 static int osc_io_setattr_start(const struct lu_env *env,
393 const struct cl_io_slice *slice)
395 struct cl_io *io = slice->cis_io;
396 struct osc_io *oio = cl2osc_io(env, slice);
397 struct cl_object *obj = slice->cis_obj;
398 struct lov_oinfo *loi = cl2osc(obj)->oo_oinfo;
399 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
400 struct obdo *oa = &oio->oi_oa;
401 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
402 __u64 size = io->u.ci_setattr.sa_attr.lvb_size;
403 unsigned int ia_valid = io->u.ci_setattr.sa_valid;
405 struct obd_info oinfo = { { { 0 } } };
407 /* truncate cache dirty pages first */
408 if (cl_io_is_trunc(io))
409 result = osc_cache_truncate_start(env, oio, cl2osc(obj), size);
411 if (result == 0 && oio->oi_lockless == 0) {
412 cl_object_attr_lock(obj);
413 result = cl_object_attr_get(env, obj, attr);
415 struct ost_lvb *lvb = &io->u.ci_setattr.sa_attr;
416 unsigned int cl_valid = 0;
418 if (ia_valid & ATTR_SIZE) {
419 attr->cat_size = attr->cat_kms = size;
420 cl_valid = CAT_SIZE | CAT_KMS;
422 if (ia_valid & ATTR_MTIME_SET) {
423 attr->cat_mtime = lvb->lvb_mtime;
424 cl_valid |= CAT_MTIME;
426 if (ia_valid & ATTR_ATIME_SET) {
427 attr->cat_atime = lvb->lvb_atime;
428 cl_valid |= CAT_ATIME;
430 if (ia_valid & ATTR_CTIME_SET) {
431 attr->cat_ctime = lvb->lvb_ctime;
432 cl_valid |= CAT_CTIME;
434 result = cl_object_attr_set(env, obj, attr, cl_valid);
436 cl_object_attr_unlock(obj);
438 memset(oa, 0, sizeof(*oa));
440 oa->o_oi = loi->loi_oi;
441 oa->o_mtime = attr->cat_mtime;
442 oa->o_atime = attr->cat_atime;
443 oa->o_ctime = attr->cat_ctime;
444 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLATIME |
445 OBD_MD_FLCTIME | OBD_MD_FLMTIME;
446 if (ia_valid & ATTR_SIZE) {
448 oa->o_blocks = OBD_OBJECT_EOF;
449 oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
451 if (oio->oi_lockless) {
452 oa->o_flags = OBD_FL_SRVLOCK;
453 oa->o_valid |= OBD_MD_FLFLAGS;
456 LASSERT(oio->oi_lockless == 0);
460 oinfo.oi_capa = io->u.ci_setattr.sa_capa;
461 init_completion(&cbargs->opc_sync);
463 if (ia_valid & ATTR_SIZE)
464 result = osc_punch_base(osc_export(cl2osc(obj)),
465 &oinfo, osc_async_upcall,
466 cbargs, PTLRPCD_SET);
468 result = osc_setattr_async_base(osc_export(cl2osc(obj)),
471 cbargs, PTLRPCD_SET);
472 cbargs->opc_rpc_sent = result == 0;
477 static void osc_io_setattr_end(const struct lu_env *env,
478 const struct cl_io_slice *slice)
480 struct cl_io *io = slice->cis_io;
481 struct osc_io *oio = cl2osc_io(env, slice);
482 struct cl_object *obj = slice->cis_obj;
483 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
486 if (cbargs->opc_rpc_sent) {
487 wait_for_completion(&cbargs->opc_sync);
488 result = io->ci_result = cbargs->opc_rc;
491 if (oio->oi_lockless) {
492 /* lockless truncate */
493 struct osc_device *osd = lu2osc_dev(obj->co_lu.lo_dev);
495 LASSERT(cl_io_is_trunc(io));
496 /* XXX: Need a lock. */
497 osd->od_stats.os_lockless_truncates++;
501 if (cl_io_is_trunc(io)) {
502 __u64 size = io->u.ci_setattr.sa_attr.lvb_size;
504 osc_trunc_check(env, io, oio, size);
505 if (oio->oi_trunc != NULL) {
506 osc_cache_truncate_end(env, oio, cl2osc(obj));
507 oio->oi_trunc = NULL;
512 static int osc_io_read_start(const struct lu_env *env,
513 const struct cl_io_slice *slice)
515 struct cl_object *obj = slice->cis_obj;
516 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
519 if (!slice->cis_io->ci_noatime) {
520 cl_object_attr_lock(obj);
521 attr->cat_atime = LTIME_S(CURRENT_TIME);
522 rc = cl_object_attr_set(env, obj, attr, CAT_ATIME);
523 cl_object_attr_unlock(obj);
528 static int osc_io_write_start(const struct lu_env *env,
529 const struct cl_io_slice *slice)
531 struct cl_object *obj = slice->cis_obj;
532 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
535 OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_DELAY_SETTIME, 1);
536 cl_object_attr_lock(obj);
537 attr->cat_mtime = attr->cat_ctime = LTIME_S(CURRENT_TIME);
538 rc = cl_object_attr_set(env, obj, attr, CAT_MTIME | CAT_CTIME);
539 cl_object_attr_unlock(obj);
544 static int osc_fsync_ost(const struct lu_env *env, struct osc_object *obj,
545 struct cl_fsync_io *fio)
547 struct osc_io *oio = osc_env_io(env);
548 struct obdo *oa = &oio->oi_oa;
549 struct obd_info *oinfo = &oio->oi_info;
550 struct lov_oinfo *loi = obj->oo_oinfo;
551 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
554 memset(oa, 0, sizeof(*oa));
555 oa->o_oi = loi->loi_oi;
556 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
558 /* reload size abd blocks for start and end of sync range */
559 oa->o_size = fio->fi_start;
560 oa->o_blocks = fio->fi_end;
561 oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
563 obdo_set_parent_fid(oa, fio->fi_fid);
565 memset(oinfo, 0, sizeof(*oinfo));
567 oinfo->oi_capa = fio->fi_capa;
568 init_completion(&cbargs->opc_sync);
570 rc = osc_sync_base(osc_export(obj), oinfo, osc_async_upcall, cbargs,
575 static int osc_io_fsync_start(const struct lu_env *env,
576 const struct cl_io_slice *slice)
578 struct cl_io *io = slice->cis_io;
579 struct cl_fsync_io *fio = &io->u.ci_fsync;
580 struct cl_object *obj = slice->cis_obj;
581 struct osc_object *osc = cl2osc(obj);
582 pgoff_t start = cl_index(obj, fio->fi_start);
583 pgoff_t end = cl_index(obj, fio->fi_end);
586 if (fio->fi_end == OBD_OBJECT_EOF)
589 result = osc_cache_writeback_range(env, osc, start, end, 0,
590 fio->fi_mode == CL_FSYNC_DISCARD);
592 fio->fi_nr_written += result;
595 if (fio->fi_mode == CL_FSYNC_ALL) {
598 /* we have to wait for writeback to finish before we can
599 * send OST_SYNC RPC. This is bad because it causes extents
600 * to be written osc by osc. However, we usually start
601 * writeback before CL_FSYNC_ALL so this won't have any real
603 rc = osc_cache_wait_range(env, osc, start, end);
606 rc = osc_fsync_ost(env, osc, fio);
614 static void osc_io_fsync_end(const struct lu_env *env,
615 const struct cl_io_slice *slice)
617 struct cl_fsync_io *fio = &slice->cis_io->u.ci_fsync;
618 struct cl_object *obj = slice->cis_obj;
619 pgoff_t start = cl_index(obj, fio->fi_start);
620 pgoff_t end = cl_index(obj, fio->fi_end);
623 if (fio->fi_mode == CL_FSYNC_LOCAL) {
624 result = osc_cache_wait_range(env, cl2osc(obj), start, end);
625 } else if (fio->fi_mode == CL_FSYNC_ALL) {
626 struct osc_io *oio = cl2osc_io(env, slice);
627 struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
629 wait_for_completion(&cbargs->opc_sync);
631 result = cbargs->opc_rc;
633 slice->cis_io->ci_result = result;
636 static void osc_io_end(const struct lu_env *env,
637 const struct cl_io_slice *slice)
639 struct osc_io *oio = cl2osc_io(env, slice);
641 if (oio->oi_active) {
642 osc_extent_release(env, oio->oi_active);
643 oio->oi_active = NULL;
647 static const struct cl_io_operations osc_io_ops = {
650 .cio_start = osc_io_read_start,
651 .cio_fini = osc_io_fini
654 .cio_start = osc_io_write_start,
655 .cio_end = osc_io_end,
656 .cio_fini = osc_io_fini
659 .cio_start = osc_io_setattr_start,
660 .cio_end = osc_io_setattr_end
663 .cio_start = osc_io_fault_start,
664 .cio_end = osc_io_end,
665 .cio_fini = osc_io_fini
668 .cio_start = osc_io_fsync_start,
669 .cio_end = osc_io_fsync_end,
670 .cio_fini = osc_io_fini
673 .cio_fini = osc_io_fini
678 .cio_submit = osc_io_submit
681 .cio_submit = osc_io_submit
684 .cio_prepare_write = osc_io_prepare_write,
685 .cio_commit_write = osc_io_commit_write
688 /*****************************************************************************
690 * Transfer operations.
694 static int osc_req_prep(const struct lu_env *env,
695 const struct cl_req_slice *slice)
700 static void osc_req_completion(const struct lu_env *env,
701 const struct cl_req_slice *slice, int ioret)
705 or = cl2osc_req(slice);
706 OBD_SLAB_FREE_PTR(or, osc_req_kmem);
710 * Implementation of struct cl_req_operations::cro_attr_set() for osc
711 * layer. osc is responsible for struct obdo::o_id and struct obdo::o_seq
714 static void osc_req_attr_set(const struct lu_env *env,
715 const struct cl_req_slice *slice,
716 const struct cl_object *obj,
717 struct cl_req_attr *attr, u64 flags)
719 struct lov_oinfo *oinfo;
720 struct cl_req *clerq;
721 struct cl_page *apage; /* _some_ page in @clerq */
722 struct cl_lock *lock; /* _some_ lock protecting @apage */
723 struct osc_lock *olck;
724 struct osc_page *opg;
728 oinfo = cl2osc(obj)->oo_oinfo;
729 lvb = &oinfo->loi_lvb;
732 if ((flags & OBD_MD_FLMTIME) != 0) {
733 oa->o_mtime = lvb->lvb_mtime;
734 oa->o_valid |= OBD_MD_FLMTIME;
736 if ((flags & OBD_MD_FLATIME) != 0) {
737 oa->o_atime = lvb->lvb_atime;
738 oa->o_valid |= OBD_MD_FLATIME;
740 if ((flags & OBD_MD_FLCTIME) != 0) {
741 oa->o_ctime = lvb->lvb_ctime;
742 oa->o_valid |= OBD_MD_FLCTIME;
744 if (flags & OBD_MD_FLGROUP) {
745 ostid_set_seq(&oa->o_oi, ostid_seq(&oinfo->loi_oi));
746 oa->o_valid |= OBD_MD_FLGROUP;
748 if (flags & OBD_MD_FLID) {
749 ostid_set_id(&oa->o_oi, ostid_id(&oinfo->loi_oi));
750 oa->o_valid |= OBD_MD_FLID;
752 if (flags & OBD_MD_FLHANDLE) {
753 clerq = slice->crs_req;
754 LASSERT(!list_empty(&clerq->crq_pages));
755 apage = container_of(clerq->crq_pages.next,
756 struct cl_page, cp_flight);
757 opg = osc_cl_page_osc(apage);
758 apage = opg->ops_cl.cpl_page; /* now apage is a sub-page */
759 lock = cl_lock_at_page(env, apage->cp_obj, apage, NULL, 1, 1);
761 struct cl_object_header *head;
762 struct cl_lock *scan;
764 head = cl_object_header(apage->cp_obj);
765 list_for_each_entry(scan, &head->coh_locks,
767 CL_LOCK_DEBUG(D_ERROR, env, scan,
769 CL_PAGE_DEBUG(D_ERROR, env, apage,
770 "dump uncover page!\n");
775 olck = osc_lock_at(lock);
776 LASSERT(olck != NULL);
777 LASSERT(ergo(opg->ops_srvlock, olck->ols_lock == NULL));
778 /* check for lockless io. */
779 if (olck->ols_lock != NULL) {
780 oa->o_handle = olck->ols_lock->l_remote_handle;
781 oa->o_valid |= OBD_MD_FLHANDLE;
783 cl_lock_put(env, lock);
787 static const struct cl_req_operations osc_req_ops = {
788 .cro_prep = osc_req_prep,
789 .cro_attr_set = osc_req_attr_set,
790 .cro_completion = osc_req_completion
794 int osc_io_init(const struct lu_env *env,
795 struct cl_object *obj, struct cl_io *io)
797 struct osc_io *oio = osc_env_io(env);
799 CL_IO_SLICE_CLEAN(oio, oi_cl);
800 cl_io_slice_add(io, &oio->oi_cl, obj, &osc_io_ops);
804 int osc_req_init(const struct lu_env *env, struct cl_device *dev,
810 OBD_SLAB_ALLOC_PTR_GFP(or, osc_req_kmem, GFP_NOFS);
812 cl_req_slice_add(req, &or->or_cl, dev, &osc_req_ops);