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 2008 Sun Microsystems, Inc. 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 * Implementation of cl_io for LOV layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
41 #define DEBUG_SUBSYSTEM S_LOV
43 #include "lov_cl_internal.h"
49 static void lov_sub_enter(struct lov_io_sub *sub)
52 if (sub->sub_reenter++ == 0) {
53 sub->sub_cookie = cl_env_reenter();
54 cl_env_implant(sub->sub_env, &sub->sub_refcheck2);
59 static void lov_sub_exit(struct lov_io_sub *sub)
62 if (--sub->sub_reenter == 0) {
63 cl_env_unplant(sub->sub_env, &sub->sub_refcheck2);
64 cl_env_reexit(sub->sub_cookie);
69 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
70 struct lov_io_sub *sub)
73 if (sub->sub_io != NULL) {
74 if (sub->sub_io_initialized) {
76 cl_io_fini(sub->sub_env, sub->sub_io);
78 sub->sub_io_initialized = 0;
79 lio->lis_active_subios--;
81 if (sub->sub_stripe == lio->lis_single_subio_index)
82 lio->lis_single_subio_index = -1;
83 else if (!sub->sub_borrowed)
84 OBD_FREE_PTR(sub->sub_io);
87 if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
88 if (!sub->sub_borrowed)
89 cl_env_put(sub->sub_env, &sub->sub_refcheck);
95 static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
96 int stripe, loff_t start, loff_t end)
98 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
99 struct cl_io *parent = lio->lis_cl.cis_io;
101 switch(io->ci_type) {
103 size_t new_size = parent->u.ci_truncate.tr_size;
105 new_size = lov_size_to_stripe(lsm, new_size, stripe);
106 io->u.ci_truncate.tr_capa = parent->u.ci_truncate.tr_capa;
107 io->u.ci_truncate.tr_size = new_size;
111 struct cl_object *obj = parent->ci_obj;
112 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
114 io->u.ci_fault = parent->u.ci_fault;
115 off = lov_size_to_stripe(lsm, off, stripe);
116 io->u.ci_fault.ft_index = cl_index(obj, off);
121 if (cl_io_is_append(parent)) {
122 io->u.ci_wr.wr_append = 1;
124 io->u.ci_rw.crw_pos = start;
125 io->u.ci_rw.crw_count = end - start;
134 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
135 struct lov_io_sub *sub)
137 struct lov_object *lov = lio->lis_object;
138 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
139 struct cl_io *sub_io;
140 struct cl_object *sub_obj;
141 struct cl_io *io = lio->lis_cl.cis_io;
143 int stripe = sub->sub_stripe;
146 LASSERT(sub->sub_io == NULL);
147 LASSERT(sub->sub_env == NULL);
148 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
152 sub->sub_io_initialized = 0;
153 sub->sub_borrowed = 0;
155 if (lio->lis_mem_frozen) {
156 LASSERT(mutex_is_locked(&ld->ld_mutex));
157 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
158 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
159 sub->sub_borrowed = 1;
163 /* obtain new environment */
164 cookie = cl_env_reenter();
165 sub->sub_env = cl_env_get(&sub->sub_refcheck);
166 cl_env_reexit(cookie);
167 if (IS_ERR(sub->sub_env))
168 result = PTR_ERR(sub->sub_env);
172 * First sub-io. Use ->lis_single_subio to
173 * avoid dynamic allocation.
175 if (lio->lis_active_subios == 0) {
176 sub->sub_io = &lio->lis_single_subio;
177 lio->lis_single_subio_index = stripe;
179 OBD_ALLOC_PTR(sub->sub_io);
180 if (sub->sub_io == NULL)
187 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
188 sub_io = sub->sub_io;
190 sub_io->ci_obj = sub_obj;
191 sub_io->ci_result = 0;
193 sub_io->ci_parent = io;
194 sub_io->ci_lockreq = io->ci_lockreq;
195 sub_io->ci_type = io->ci_type;
196 sub_io->ci_no_srvlock = io->ci_no_srvlock;
199 result = cl_io_sub_init(sub->sub_env, sub_io,
200 io->ci_type, sub_obj);
203 lio->lis_active_subios++;
204 sub->sub_io_initialized = 1;
209 lov_io_sub_fini(env, lio, sub);
213 struct lov_io_sub *lov_sub_get(const struct lu_env *env,
214 struct lov_io *lio, int stripe)
217 struct lov_io_sub *sub = &lio->lis_subs[stripe];
219 LASSERT(stripe < lio->lis_stripe_count);
222 if (!sub->sub_io_initialized) {
223 sub->sub_stripe = stripe;
224 rc = lov_io_sub_init(env, lio, sub);
234 void lov_sub_put(struct lov_io_sub *sub)
239 /*****************************************************************************
245 static int lov_page_stripe(const struct cl_page *page)
247 struct lovsub_object *subobj;
251 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
252 &lovsub_device_type));
253 LASSERT(subobj != NULL);
254 RETURN(subobj->lso_index);
257 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
258 const struct cl_page_slice *slice)
260 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
261 struct cl_page *page = slice->cpl_page;
264 LASSERT(lio->lis_cl.cis_io != NULL);
265 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
266 LASSERT(lsm != NULL);
267 LASSERT(lio->lis_nr_subios > 0);
270 stripe = lov_page_stripe(page);
271 RETURN(lov_sub_get(env, lio, stripe));
275 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
278 struct lov_object *lov = lio->lis_object;
279 struct lov_stripe_md *lsm = lov_r0(lov)->lo_lsm;
282 LASSERT(lio->lis_object != NULL);
286 * Need to be optimized, we can't afford to allocate a piece of memory
287 * when writing a page. -jay
289 OBD_ALLOC(lio->lis_subs,
290 lsm->lsm_stripe_count * sizeof lio->lis_subs[0]);
291 if (lio->lis_subs != NULL) {
292 lio->lis_nr_subios = lio->lis_stripe_count;
293 lio->lis_single_subio_index = -1;
294 lio->lis_active_subios = 0;
301 static void lov_io_slice_init(struct lov_io *lio,
302 struct lov_object *obj, struct cl_io *io)
304 struct lov_stripe_md *lsm = lov_r0(obj)->lo_lsm;
306 LASSERT(lsm != NULL);
310 lio->lis_object = obj;
311 lio->lis_stripe_count = lsm->lsm_stripe_count;
313 switch (io->ci_type) {
316 lio->lis_pos = io->u.ci_rw.crw_pos;
317 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
318 lio->lis_io_endpos = lio->lis_endpos;
319 if (cl_io_is_append(io)) {
320 LASSERT(io->ci_type == CIT_WRITE);
322 lio->lis_endpos = OBD_OBJECT_EOF;
327 lio->lis_pos = io->u.ci_truncate.tr_size;
328 lio->lis_endpos = OBD_OBJECT_EOF;
332 pgoff_t index = io->u.ci_fault.ft_index;
333 lio->lis_pos = cl_offset(io->ci_obj, index);
334 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
340 lio->lis_endpos = OBD_OBJECT_EOF;
350 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
352 struct lov_io *lio = cl2lov_io(env, ios);
356 if (lio->lis_subs != NULL) {
357 for (i = 0; i < lio->lis_nr_subios; i++)
358 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
359 OBD_FREE(lio->lis_subs,
360 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
361 lio->lis_nr_subios = 0;
366 static obd_off lov_offset_mod(obd_off val, int delta)
368 if (val != OBD_OBJECT_EOF)
373 static int lov_io_iter_init(const struct lu_env *env,
374 const struct cl_io_slice *ios)
376 struct lov_io *lio = cl2lov_io(env, ios);
377 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
378 struct lov_io_sub *sub;
386 endpos = lov_offset_mod(lio->lis_endpos, -1);
387 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
388 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
389 endpos, &start, &end))
392 end = lov_offset_mod(end, +1);
393 sub = lov_sub_get(env, lio, stripe);
395 lov_io_sub_inherit(sub->sub_io, lio, stripe,
397 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
399 CDEBUG(D_VFSTRACE, "shrink: %i [%llu, %llu)\n",
405 list_add_tail(&sub->sub_linkage, &lio->lis_active);
412 static int lov_io_rw_iter_init(const struct lu_env *env,
413 const struct cl_io_slice *ios)
415 struct lov_io *lio = cl2lov_io(env, ios);
416 struct cl_io *io = ios->cis_io;
417 struct lov_stripe_md *lsm = lov_r0(cl2lov(ios->cis_obj))->lo_lsm;
418 loff_t start = io->u.ci_rw.crw_pos;
420 unsigned long ssize = lsm->lsm_stripe_size;
422 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
425 /* fast path for common case. */
426 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
428 do_div(start, ssize);
429 next = (start + 1) * ssize;
430 if (next <= start * ssize)
433 io->ci_continue = next < lio->lis_io_endpos;
434 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
435 next) - io->u.ci_rw.crw_pos;
436 lio->lis_pos = io->u.ci_rw.crw_pos;
437 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
438 CDEBUG(D_VFSTRACE, "stripe: %llu chunk: [%llu, %llu) %llu\n",
439 (__u64)start, lio->lis_pos, lio->lis_endpos,
440 (__u64)lio->lis_io_endpos);
443 * XXX The following call should be optimized: we know, that
444 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
446 RETURN(lov_io_iter_init(env, ios));
449 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
450 int (*iofunc)(const struct lu_env *, struct cl_io *))
452 struct lov_io_sub *sub;
456 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
458 rc = iofunc(sub->sub_env, sub->sub_io);
466 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
469 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
472 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
475 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
478 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
482 * It's possible that lov_io_start() wasn't called against this
483 * sub-io, either because previous sub-io failed, or upper layer
486 if (io->ci_state == CIS_IO_GOING)
489 io->ci_state = CIS_IO_FINISHED;
493 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
495 cl_io_iter_fini(env, io);
499 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
501 cl_io_unlock(env, io);
505 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
509 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
513 static void lov_io_iter_fini(const struct lu_env *env,
514 const struct cl_io_slice *ios)
516 struct lov_io *lio = cl2lov_io(env, ios);
520 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
522 while (!list_empty(&lio->lis_active))
523 list_del_init(lio->lis_active.next);
527 static void lov_io_unlock(const struct lu_env *env,
528 const struct cl_io_slice *ios)
533 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
539 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
540 struct cl_page_list *qin,
543 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
547 * lov implementation of cl_operations::cio_submit() method. It takes a list
548 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
549 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
552 * Major complication of this function is a need to handle memory cleansing:
553 * cl_io_submit() is called to write out pages as a part of VM memory
554 * reclamation, and hence it may not fail due to memory shortages (system
555 * dead-locks otherwise). To deal with this, some resources (sub-lists,
556 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
557 * not-memory cleansing context), and in case of memory shortage, these
558 * pre-allocated resources are used by lov_io_submit() under
559 * lov_device::ld_mutex mutex.
561 static int lov_io_submit(const struct lu_env *env,
562 const struct cl_io_slice *ios,
563 enum cl_req_type crt, struct cl_2queue *queue,
564 enum cl_req_priority priority)
566 struct lov_io *lio = cl2lov_io(env, ios);
567 struct lov_object *obj = lio->lis_object;
568 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
569 struct cl_page_list *qin = &queue->c2_qin;
570 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
571 struct cl_page_list *stripes_qin = NULL;
572 struct cl_page *page;
576 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
580 #if defined(__KERNEL__) && defined(__linux__)
581 !(current->flags & PF_MEMALLOC);
586 if (lio->lis_active_subios == 1) {
587 int idx = lio->lis_single_subio_index;
588 struct lov_io_sub *sub;
590 LASSERT(idx < lio->lis_nr_subios);
591 sub = lov_sub_get(env, lio, idx);
592 LASSERT(!IS_ERR(sub));
593 LASSERT(sub->sub_io == &lio->lis_single_subio);
594 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
595 crt, queue, priority);
600 LASSERT(lio->lis_subs != NULL);
602 OBD_ALLOC(stripes_qin,
603 sizeof(*stripes_qin) * lio->lis_nr_subios);
604 if (stripes_qin == NULL)
607 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
608 cl_page_list_init(&stripes_qin[stripe]);
611 * If we get here, it means pageout & swap doesn't help.
612 * In order to not make things worse, even don't try to
613 * allocate the memory with __GFP_NOWARN. -jay
615 mutex_lock(&ld->ld_mutex);
616 lio->lis_mem_frozen = 1;
619 cl_2queue_init(cl2q);
620 cl_page_list_for_each_safe(page, tmp, qin) {
621 stripe = lov_page_stripe(page);
622 cl_page_list_move(QIN(stripe), qin, page);
625 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
626 struct lov_io_sub *sub;
627 struct cl_page_list *sub_qin = QIN(stripe);
629 if (list_empty(&sub_qin->pl_pages))
632 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
633 sub = lov_sub_get(env, lio, stripe);
635 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
636 crt, cl2q, priority);
640 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
641 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
646 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
647 struct cl_page_list *sub_qin = QIN(stripe);
649 if (list_empty(&sub_qin->pl_pages))
652 cl_page_list_splice(sub_qin, qin);
656 OBD_FREE(stripes_qin,
657 sizeof(*stripes_qin) * lio->lis_nr_subios);
661 for (i = 0; i < lio->lis_nr_subios; i++) {
662 struct cl_io *cio = lio->lis_subs[i].sub_io;
664 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
665 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
667 lio->lis_mem_frozen = 0;
668 mutex_unlock(&ld->ld_mutex);
675 static int lov_io_prepare_write(const struct lu_env *env,
676 const struct cl_io_slice *ios,
677 const struct cl_page_slice *slice,
678 unsigned from, unsigned to)
680 struct lov_io *lio = cl2lov_io(env, ios);
681 struct cl_page *sub_page = lov_sub_page(slice);
682 struct lov_io_sub *sub;
686 sub = lov_page_subio(env, lio, slice);
688 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
692 result = PTR_ERR(sub);
696 static int lov_io_commit_write(const struct lu_env *env,
697 const struct cl_io_slice *ios,
698 const struct cl_page_slice *slice,
699 unsigned from, unsigned to)
701 struct lov_io *lio = cl2lov_io(env, ios);
702 struct cl_page *sub_page = lov_sub_page(slice);
703 struct lov_io_sub *sub;
707 sub = lov_page_subio(env, lio, slice);
709 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
713 result = PTR_ERR(sub);
717 static int lov_io_fault_start(const struct lu_env *env,
718 const struct cl_io_slice *ios)
720 struct cl_fault_io *fio;
722 struct lov_io_sub *sub;
725 fio = &ios->cis_io->u.ci_fault;
726 lio = cl2lov_io(env, ios);
727 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
728 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
730 RETURN(lov_io_start(env, ios));
733 static const struct cl_io_operations lov_io_ops = {
736 .cio_fini = lov_io_fini,
737 .cio_iter_init = lov_io_rw_iter_init,
738 .cio_iter_fini = lov_io_iter_fini,
739 .cio_lock = lov_io_lock,
740 .cio_unlock = lov_io_unlock,
741 .cio_start = lov_io_start,
742 .cio_end = lov_io_end
745 .cio_fini = lov_io_fini,
746 .cio_iter_init = lov_io_rw_iter_init,
747 .cio_iter_fini = lov_io_iter_fini,
748 .cio_lock = lov_io_lock,
749 .cio_unlock = lov_io_unlock,
750 .cio_start = lov_io_start,
751 .cio_end = lov_io_end
754 .cio_fini = lov_io_fini,
755 .cio_iter_init = lov_io_iter_init,
756 .cio_iter_fini = lov_io_iter_fini,
757 .cio_lock = lov_io_lock,
758 .cio_unlock = lov_io_unlock,
759 .cio_start = lov_io_start,
760 .cio_end = lov_io_end
763 .cio_fini = lov_io_fini,
764 .cio_iter_init = lov_io_iter_init,
765 .cio_iter_fini = lov_io_iter_fini,
766 .cio_lock = lov_io_lock,
767 .cio_unlock = lov_io_unlock,
768 .cio_start = lov_io_fault_start,
769 .cio_end = lov_io_end
772 .cio_fini = lov_io_fini
777 .cio_submit = lov_io_submit
780 .cio_submit = lov_io_submit
783 .cio_prepare_write = lov_io_prepare_write,
784 .cio_commit_write = lov_io_commit_write
787 /*****************************************************************************
789 * Empty lov io operations.
793 static void lov_empty_io_fini(const struct lu_env *env,
794 const struct cl_io_slice *ios)
800 static void lov_empty_impossible(const struct lu_env *env,
801 struct cl_io_slice *ios)
806 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
809 * An io operation vector for files without stripes.
811 static const struct cl_io_operations lov_empty_io_ops = {
815 .cio_fini = lov_empty_io_fini,
816 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
817 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
818 .cio_start = LOV_EMPTY_IMPOSSIBLE,
819 .cio_end = LOV_EMPTY_IMPOSSIBLE
823 .cio_fini = lov_empty_io_fini,
824 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
825 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
826 .cio_start = LOV_EMPTY_IMPOSSIBLE,
827 .cio_end = LOV_EMPTY_IMPOSSIBLE
830 .cio_fini = lov_empty_io_fini,
831 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
832 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
833 .cio_start = LOV_EMPTY_IMPOSSIBLE,
834 .cio_end = LOV_EMPTY_IMPOSSIBLE
837 .cio_fini = lov_empty_io_fini,
838 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
839 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
840 .cio_start = LOV_EMPTY_IMPOSSIBLE,
841 .cio_end = LOV_EMPTY_IMPOSSIBLE
844 .cio_fini = lov_empty_io_fini
849 .cio_submit = LOV_EMPTY_IMPOSSIBLE
852 .cio_submit = LOV_EMPTY_IMPOSSIBLE
855 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
858 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
861 struct lov_io *lio = lov_env_io(env);
862 struct lov_object *lov = cl2lov(obj);
865 CFS_INIT_LIST_HEAD(&lio->lis_active);
866 lov_io_slice_init(lio, lov, io);
867 if (io->ci_result == 0) {
868 LASSERT(lov_r0(lov)->lo_lsm != NULL);
869 io->ci_result = lov_io_subio_init(env, lio, io);
870 if (io->ci_result == 0)
871 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
873 RETURN(io->ci_result);
876 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
879 struct lov_io *lio = lov_env_io(env);
883 switch (io->ci_type) {
896 CERROR("Page fault on a file without stripes: "DFID"\n",
897 PFID(lu_object_fid(&obj->co_lu)));
901 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
902 io->ci_result = result;