4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_io for LOV layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_LOV
40 #include "lov_cl_internal.h"
46 static inline void lov_sub_enter(struct lov_io_sub *sub)
51 static inline void lov_sub_exit(struct lov_io_sub *sub)
56 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
57 struct lov_io_sub *sub)
60 if (sub->sub_io_initialized) {
62 cl_io_fini(sub->sub_env, sub->sub_io);
64 sub->sub_io_initialized = 0;
65 lio->lis_active_subios--;
67 if (sub->sub_stripe == lio->lis_single_subio_index)
68 lio->lis_single_subio_index = -1;
69 else if (!sub->sub_borrowed)
73 if (!IS_ERR_OR_NULL(sub->sub_env)) {
74 if (!sub->sub_borrowed)
75 cl_env_put(sub->sub_env, &sub->sub_refcheck);
80 static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
81 int stripe, loff_t start, loff_t end)
83 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
84 struct cl_io *parent = lio->lis_cl.cis_io;
86 switch (io->ci_type) {
88 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
89 io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
90 if (cl_io_is_trunc(io)) {
91 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
93 new_size = lov_size_to_stripe(lsm, new_size, stripe);
94 io->u.ci_setattr.sa_attr.lvb_size = new_size;
99 struct cl_object *obj = parent->ci_obj;
100 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
102 io->u.ci_fault = parent->u.ci_fault;
103 off = lov_size_to_stripe(lsm, off, stripe);
104 io->u.ci_fault.ft_index = cl_index(obj, off);
108 io->u.ci_fsync.fi_start = start;
109 io->u.ci_fsync.fi_end = end;
110 io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
111 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
116 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
117 if (cl_io_is_append(parent)) {
118 io->u.ci_wr.wr_append = 1;
120 io->u.ci_rw.crw_pos = start;
121 io->u.ci_rw.crw_count = end - start;
130 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
131 struct lov_io_sub *sub)
133 struct lov_object *lov = lio->lis_object;
134 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
135 struct cl_io *sub_io;
136 struct cl_object *sub_obj;
137 struct cl_io *io = lio->lis_cl.cis_io;
139 int stripe = sub->sub_stripe;
142 LASSERT(!sub->sub_io);
143 LASSERT(!sub->sub_env);
144 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
146 if (unlikely(!lov_r0(lov)->lo_sub[stripe]))
150 sub->sub_io_initialized = 0;
151 sub->sub_borrowed = 0;
153 if (lio->lis_mem_frozen) {
154 LASSERT(mutex_is_locked(&ld->ld_mutex));
155 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
156 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
157 sub->sub_borrowed = 1;
161 /* obtain new environment */
162 cookie = cl_env_reenter();
163 sub->sub_env = cl_env_get(&sub->sub_refcheck);
164 cl_env_reexit(cookie);
165 if (IS_ERR(sub->sub_env))
166 result = PTR_ERR(sub->sub_env);
170 * First sub-io. Use ->lis_single_subio to
171 * avoid dynamic allocation.
173 if (lio->lis_active_subios == 0) {
174 sub->sub_io = &lio->lis_single_subio;
175 lio->lis_single_subio_index = stripe;
177 sub->sub_io = kzalloc(sizeof(*sub->sub_io),
186 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
187 sub_io = sub->sub_io;
189 sub_io->ci_obj = sub_obj;
190 sub_io->ci_result = 0;
192 sub_io->ci_parent = io;
193 sub_io->ci_lockreq = io->ci_lockreq;
194 sub_io->ci_type = io->ci_type;
195 sub_io->ci_no_srvlock = io->ci_no_srvlock;
196 sub_io->ci_noatime = io->ci_noatime;
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);
221 if (!sub->sub_io_initialized) {
222 sub->sub_stripe = stripe;
223 rc = lov_io_sub_init(env, lio, sub);
234 void lov_sub_put(struct lov_io_sub *sub)
239 /*****************************************************************************
245 int lov_page_stripe(const struct cl_page *page)
247 struct lovsub_object *subobj;
248 const struct cl_page_slice *slice;
250 slice = cl_page_at(page, &lovsub_device_type);
251 LASSERT(slice->cpl_obj);
253 subobj = cl2lovsub(slice->cpl_obj);
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 = lio->lis_object->lo_lsm;
261 struct cl_page *page = slice->cpl_page;
264 LASSERT(lio->lis_cl.cis_io);
265 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
267 LASSERT(lio->lis_nr_subios > 0);
269 stripe = lov_page_stripe(page);
270 return lov_sub_get(env, lio, stripe);
273 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
276 struct lov_stripe_md *lsm;
279 LASSERT(lio->lis_object);
280 lsm = lio->lis_object->lo_lsm;
283 * Need to be optimized, we can't afford to allocate a piece of memory
284 * when writing a page. -jay
287 libcfs_kvzalloc(lsm->lsm_stripe_count *
288 sizeof(lio->lis_subs[0]),
291 lio->lis_nr_subios = lio->lis_stripe_count;
292 lio->lis_single_subio_index = -1;
293 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)
305 lio->lis_object = obj;
307 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
309 switch (io->ci_type) {
312 lio->lis_pos = io->u.ci_rw.crw_pos;
313 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
314 lio->lis_io_endpos = lio->lis_endpos;
315 if (cl_io_is_append(io)) {
316 LASSERT(io->ci_type == CIT_WRITE);
318 lio->lis_endpos = OBD_OBJECT_EOF;
323 if (cl_io_is_trunc(io))
324 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
327 lio->lis_endpos = OBD_OBJECT_EOF;
331 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);
339 lio->lis_pos = io->u.ci_fsync.fi_start;
340 lio->lis_endpos = io->u.ci_fsync.fi_end;
346 lio->lis_endpos = OBD_OBJECT_EOF;
354 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
356 struct lov_io *lio = cl2lov_io(env, ios);
357 struct lov_object *lov = cl2lov(ios->cis_obj);
361 for (i = 0; i < lio->lis_nr_subios; i++)
362 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
363 kvfree(lio->lis_subs);
364 lio->lis_nr_subios = 0;
367 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
368 if (atomic_dec_and_test(&lov->lo_active_ios))
369 wake_up_all(&lov->lo_waitq);
372 static u64 lov_offset_mod(u64 val, int delta)
374 if (val != OBD_OBJECT_EOF)
379 static int lov_io_iter_init(const struct lu_env *env,
380 const struct cl_io_slice *ios)
382 struct lov_io *lio = cl2lov_io(env, ios);
383 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
384 struct lov_io_sub *sub;
391 endpos = lov_offset_mod(lio->lis_endpos, -1);
392 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
393 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
394 endpos, &start, &end))
397 if (unlikely(!lov_r0(lio->lis_object)->lo_sub[stripe])) {
398 if (ios->cis_io->ci_type == CIT_READ ||
399 ios->cis_io->ci_type == CIT_WRITE ||
400 ios->cis_io->ci_type == CIT_FAULT)
406 end = lov_offset_mod(end, 1);
407 sub = lov_sub_get(env, lio, stripe);
409 lov_io_sub_inherit(sub->sub_io, lio, stripe,
411 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
413 CDEBUG(D_VFSTRACE, "shrink: %d [%llu, %llu)\n",
420 list_add_tail(&sub->sub_linkage, &lio->lis_active);
427 static int lov_io_rw_iter_init(const struct lu_env *env,
428 const struct cl_io_slice *ios)
430 struct lov_io *lio = cl2lov_io(env, ios);
431 struct cl_io *io = ios->cis_io;
432 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
433 __u64 start = io->u.ci_rw.crw_pos;
435 unsigned long ssize = lsm->lsm_stripe_size;
437 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
439 /* fast path for common case. */
440 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
441 lov_do_div64(start, ssize);
442 next = (start + 1) * ssize;
443 if (next <= start * ssize)
446 io->ci_continue = next < lio->lis_io_endpos;
447 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
448 next) - io->u.ci_rw.crw_pos;
449 lio->lis_pos = io->u.ci_rw.crw_pos;
450 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
451 CDEBUG(D_VFSTRACE, "stripe: %llu chunk: [%llu, %llu) %llu\n",
452 (__u64)start, lio->lis_pos, lio->lis_endpos,
453 (__u64)lio->lis_io_endpos);
456 * XXX The following call should be optimized: we know, that
457 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
459 return lov_io_iter_init(env, ios);
462 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
463 int (*iofunc)(const struct lu_env *, struct cl_io *))
465 struct cl_io *parent = lio->lis_cl.cis_io;
466 struct lov_io_sub *sub;
469 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
471 rc = iofunc(sub->sub_env, sub->sub_io);
476 if (parent->ci_result == 0)
477 parent->ci_result = sub->sub_io->ci_result;
482 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
484 return lov_io_call(env, cl2lov_io(env, ios), cl_io_lock);
487 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
489 return lov_io_call(env, cl2lov_io(env, ios), cl_io_start);
492 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
495 * It's possible that lov_io_start() wasn't called against this
496 * sub-io, either because previous sub-io failed, or upper layer
499 if (io->ci_state == CIS_IO_GOING)
502 io->ci_state = CIS_IO_FINISHED;
506 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
508 cl_io_iter_fini(env, io);
512 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
514 cl_io_unlock(env, io);
518 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
522 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
526 static void lov_io_iter_fini(const struct lu_env *env,
527 const struct cl_io_slice *ios)
529 struct lov_io *lio = cl2lov_io(env, ios);
532 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
534 while (!list_empty(&lio->lis_active))
535 list_del_init(lio->lis_active.next);
538 static void lov_io_unlock(const struct lu_env *env,
539 const struct cl_io_slice *ios)
543 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
548 * lov implementation of cl_operations::cio_submit() method. It takes a list
549 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
550 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
553 * Major complication of this function is a need to handle memory cleansing:
554 * cl_io_submit() is called to write out pages as a part of VM memory
555 * reclamation, and hence it may not fail due to memory shortages (system
556 * dead-locks otherwise). To deal with this, some resources (sub-lists,
557 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
558 * not-memory cleansing context), and in case of memory shortage, these
559 * pre-allocated resources are used by lov_io_submit() under
560 * lov_device::ld_mutex mutex.
562 static int lov_io_submit(const struct lu_env *env,
563 const struct cl_io_slice *ios,
564 enum cl_req_type crt, struct cl_2queue *queue)
566 struct cl_page_list *qin = &queue->c2_qin;
567 struct lov_io *lio = cl2lov_io(env, ios);
568 struct lov_io_sub *sub;
569 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
570 struct cl_page *page;
575 if (lio->lis_active_subios == 1) {
576 int idx = lio->lis_single_subio_index;
578 LASSERT(idx < lio->lis_nr_subios);
579 sub = lov_sub_get(env, lio, idx);
580 LASSERT(!IS_ERR(sub));
581 LASSERT(sub->sub_io == &lio->lis_single_subio);
582 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
588 LASSERT(lio->lis_subs);
590 cl_page_list_init(plist);
591 while (qin->pl_nr > 0) {
592 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
594 cl_2queue_init(cl2q);
596 page = cl_page_list_first(qin);
597 cl_page_list_move(&cl2q->c2_qin, qin, page);
599 stripe = lov_page_stripe(page);
600 while (qin->pl_nr > 0) {
601 page = cl_page_list_first(qin);
602 if (stripe != lov_page_stripe(page))
605 cl_page_list_move(&cl2q->c2_qin, qin, page);
608 sub = lov_sub_get(env, lio, stripe);
610 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
617 cl_page_list_splice(&cl2q->c2_qin, plist);
618 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
619 cl_2queue_fini(env, cl2q);
625 cl_page_list_splice(plist, qin);
626 cl_page_list_fini(env, plist);
631 static int lov_io_commit_async(const struct lu_env *env,
632 const struct cl_io_slice *ios,
633 struct cl_page_list *queue, int from, int to,
636 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
637 struct lov_io *lio = cl2lov_io(env, ios);
638 struct lov_io_sub *sub;
639 struct cl_page *page;
642 if (lio->lis_active_subios == 1) {
643 int idx = lio->lis_single_subio_index;
645 LASSERT(idx < lio->lis_nr_subios);
646 sub = lov_sub_get(env, lio, idx);
647 LASSERT(!IS_ERR(sub));
648 LASSERT(sub->sub_io == &lio->lis_single_subio);
649 rc = cl_io_commit_async(sub->sub_env, sub->sub_io, queue,
655 LASSERT(lio->lis_subs);
657 cl_page_list_init(plist);
658 while (queue->pl_nr > 0) {
662 LASSERT(plist->pl_nr == 0);
663 page = cl_page_list_first(queue);
664 cl_page_list_move(plist, queue, page);
666 stripe = lov_page_stripe(page);
667 while (queue->pl_nr > 0) {
668 page = cl_page_list_first(queue);
669 if (stripe != lov_page_stripe(page))
672 cl_page_list_move(plist, queue, page);
675 if (queue->pl_nr > 0) /* still has more pages */
676 stripe_to = PAGE_SIZE;
678 sub = lov_sub_get(env, lio, stripe);
680 rc = cl_io_commit_async(sub->sub_env, sub->sub_io,
681 plist, from, stripe_to, cb);
688 if (plist->pl_nr > 0) /* short write */
694 /* for error case, add the page back into the qin list */
695 LASSERT(ergo(rc == 0, plist->pl_nr == 0));
696 while (plist->pl_nr > 0) {
697 /* error occurred, add the uncommitted pages back into queue */
698 page = cl_page_list_last(plist);
699 cl_page_list_move_head(queue, plist, page);
705 static int lov_io_fault_start(const struct lu_env *env,
706 const struct cl_io_slice *ios)
708 struct cl_fault_io *fio;
710 struct lov_io_sub *sub;
712 fio = &ios->cis_io->u.ci_fault;
713 lio = cl2lov_io(env, ios);
714 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
717 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
719 return lov_io_start(env, ios);
722 static void lov_io_fsync_end(const struct lu_env *env,
723 const struct cl_io_slice *ios)
725 struct lov_io *lio = cl2lov_io(env, ios);
726 struct lov_io_sub *sub;
727 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
730 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
731 struct cl_io *subio = sub->sub_io;
734 lov_io_end_wrapper(sub->sub_env, subio);
737 if (subio->ci_result == 0)
738 *written += subio->u.ci_fsync.fi_nr_written;
742 static const struct cl_io_operations lov_io_ops = {
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_rw_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_start,
769 .cio_end = lov_io_end
772 .cio_fini = lov_io_fini,
773 .cio_iter_init = lov_io_iter_init,
774 .cio_iter_fini = lov_io_iter_fini,
775 .cio_lock = lov_io_lock,
776 .cio_unlock = lov_io_unlock,
777 .cio_start = lov_io_fault_start,
778 .cio_end = lov_io_end
781 .cio_fini = lov_io_fini,
782 .cio_iter_init = lov_io_iter_init,
783 .cio_iter_fini = lov_io_iter_fini,
784 .cio_lock = lov_io_lock,
785 .cio_unlock = lov_io_unlock,
786 .cio_start = lov_io_start,
787 .cio_end = lov_io_fsync_end
790 .cio_fini = lov_io_fini
793 .cio_submit = lov_io_submit,
794 .cio_commit_async = lov_io_commit_async,
797 /*****************************************************************************
799 * Empty lov io operations.
803 static void lov_empty_io_fini(const struct lu_env *env,
804 const struct cl_io_slice *ios)
806 struct lov_object *lov = cl2lov(ios->cis_obj);
808 if (atomic_dec_and_test(&lov->lo_active_ios))
809 wake_up_all(&lov->lo_waitq);
812 static void lov_empty_impossible(const struct lu_env *env,
813 struct cl_io_slice *ios)
818 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
821 * An io operation vector for files without stripes.
823 static const struct cl_io_operations lov_empty_io_ops = {
826 .cio_fini = lov_empty_io_fini,
828 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
829 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
830 .cio_start = LOV_EMPTY_IMPOSSIBLE,
831 .cio_end = LOV_EMPTY_IMPOSSIBLE
835 .cio_fini = lov_empty_io_fini,
836 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
837 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
838 .cio_start = LOV_EMPTY_IMPOSSIBLE,
839 .cio_end = LOV_EMPTY_IMPOSSIBLE
842 .cio_fini = lov_empty_io_fini,
843 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
844 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
845 .cio_start = LOV_EMPTY_IMPOSSIBLE,
846 .cio_end = LOV_EMPTY_IMPOSSIBLE
849 .cio_fini = lov_empty_io_fini,
850 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
851 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
852 .cio_start = LOV_EMPTY_IMPOSSIBLE,
853 .cio_end = LOV_EMPTY_IMPOSSIBLE
856 .cio_fini = lov_empty_io_fini
859 .cio_fini = lov_empty_io_fini
862 .cio_submit = LOV_EMPTY_IMPOSSIBLE,
863 .cio_commit_async = LOV_EMPTY_IMPOSSIBLE
866 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
869 struct lov_io *lio = lov_env_io(env);
870 struct lov_object *lov = cl2lov(obj);
872 INIT_LIST_HEAD(&lio->lis_active);
873 lov_io_slice_init(lio, lov, io);
874 if (io->ci_result == 0) {
875 io->ci_result = lov_io_subio_init(env, lio, io);
876 if (io->ci_result == 0) {
877 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
878 atomic_inc(&lov->lo_active_ios);
881 return io->ci_result;
884 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
887 struct lov_object *lov = cl2lov(obj);
888 struct lov_io *lio = lov_env_io(env);
891 lio->lis_object = lov;
892 switch (io->ci_type) {
908 CERROR("Page fault on a file without stripes: "DFID"\n",
909 PFID(lu_object_fid(&obj->co_lu)));
913 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
914 atomic_inc(&lov->lo_active_ios);
917 io->ci_result = result < 0 ? result : 0;
921 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
924 struct lov_object *lov = cl2lov(obj);
925 struct lov_io *lio = lov_env_io(env);
928 LASSERT(lov->lo_lsm);
929 lio->lis_object = lov;
931 switch (io->ci_type) {
933 LASSERTF(0, "invalid type %d\n", io->ci_type);
939 /* the truncate to 0 is managed by MDT:
940 * - in open, for open O_TRUNC
941 * - in setattr, for truncate
943 /* the truncate is for size > 0 so triggers a restore */
944 if (cl_io_is_trunc(io))
945 io->ci_restore_needed = 1;
951 io->ci_restore_needed = 1;
956 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
957 atomic_inc(&lov->lo_active_ios);
960 io->ci_result = result < 0 ? result : 0;