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 const struct cl_page_slice *slice;
249 slice = cl_page_at(page, &lov_device_type);
250 LASSERT(slice->cpl_obj);
252 return cl2lov_page(slice)->lps_stripe;
255 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
256 const struct cl_page_slice *slice)
258 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
259 struct cl_page *page = slice->cpl_page;
262 LASSERT(lio->lis_cl.cis_io);
263 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
265 LASSERT(lio->lis_nr_subios > 0);
267 stripe = lov_page_stripe(page);
268 return lov_sub_get(env, lio, stripe);
271 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
274 struct lov_stripe_md *lsm;
277 LASSERT(lio->lis_object);
278 lsm = lio->lis_object->lo_lsm;
281 * Need to be optimized, we can't afford to allocate a piece of memory
282 * when writing a page. -jay
285 libcfs_kvzalloc(lsm->lsm_stripe_count *
286 sizeof(lio->lis_subs[0]),
289 lio->lis_nr_subios = lio->lis_stripe_count;
290 lio->lis_single_subio_index = -1;
291 lio->lis_active_subios = 0;
299 static int lov_io_slice_init(struct lov_io *lio, struct lov_object *obj,
303 lio->lis_object = obj;
305 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
307 switch (io->ci_type) {
310 lio->lis_pos = io->u.ci_rw.crw_pos;
311 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
312 lio->lis_io_endpos = lio->lis_endpos;
313 if (cl_io_is_append(io)) {
314 LASSERT(io->ci_type == CIT_WRITE);
317 * If there is LOV EA hole, then we may cannot locate
318 * the current file-tail exactly.
320 if (unlikely(obj->lo_lsm->lsm_pattern &
325 lio->lis_endpos = OBD_OBJECT_EOF;
330 if (cl_io_is_trunc(io))
331 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
334 lio->lis_endpos = OBD_OBJECT_EOF;
338 pgoff_t index = io->u.ci_fault.ft_index;
340 lio->lis_pos = cl_offset(io->ci_obj, index);
341 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
346 lio->lis_pos = io->u.ci_fsync.fi_start;
347 lio->lis_endpos = io->u.ci_fsync.fi_end;
353 lio->lis_endpos = OBD_OBJECT_EOF;
362 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
364 struct lov_io *lio = cl2lov_io(env, ios);
365 struct lov_object *lov = cl2lov(ios->cis_obj);
369 for (i = 0; i < lio->lis_nr_subios; i++)
370 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
371 kvfree(lio->lis_subs);
372 lio->lis_nr_subios = 0;
375 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
376 if (atomic_dec_and_test(&lov->lo_active_ios))
377 wake_up_all(&lov->lo_waitq);
380 static u64 lov_offset_mod(u64 val, int delta)
382 if (val != OBD_OBJECT_EOF)
387 static int lov_io_iter_init(const struct lu_env *env,
388 const struct cl_io_slice *ios)
390 struct lov_io *lio = cl2lov_io(env, ios);
391 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
392 struct lov_io_sub *sub;
399 endpos = lov_offset_mod(lio->lis_endpos, -1);
400 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
401 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
402 endpos, &start, &end))
405 if (unlikely(!lov_r0(lio->lis_object)->lo_sub[stripe])) {
406 if (ios->cis_io->ci_type == CIT_READ ||
407 ios->cis_io->ci_type == CIT_WRITE ||
408 ios->cis_io->ci_type == CIT_FAULT)
414 end = lov_offset_mod(end, 1);
415 sub = lov_sub_get(env, lio, stripe);
417 lov_io_sub_inherit(sub->sub_io, lio, stripe,
419 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
421 CDEBUG(D_VFSTRACE, "shrink: %d [%llu, %llu)\n",
428 list_add_tail(&sub->sub_linkage, &lio->lis_active);
435 static int lov_io_rw_iter_init(const struct lu_env *env,
436 const struct cl_io_slice *ios)
438 struct lov_io *lio = cl2lov_io(env, ios);
439 struct cl_io *io = ios->cis_io;
440 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
441 __u64 start = io->u.ci_rw.crw_pos;
443 unsigned long ssize = lsm->lsm_stripe_size;
445 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
447 /* fast path for common case. */
448 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
449 lov_do_div64(start, ssize);
450 next = (start + 1) * ssize;
451 if (next <= start * ssize)
454 io->ci_continue = next < lio->lis_io_endpos;
455 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
456 next) - io->u.ci_rw.crw_pos;
457 lio->lis_pos = io->u.ci_rw.crw_pos;
458 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
459 CDEBUG(D_VFSTRACE, "stripe: %llu chunk: [%llu, %llu) %llu\n",
460 (__u64)start, lio->lis_pos, lio->lis_endpos,
461 (__u64)lio->lis_io_endpos);
464 * XXX The following call should be optimized: we know, that
465 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
467 return lov_io_iter_init(env, ios);
470 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
471 int (*iofunc)(const struct lu_env *, struct cl_io *))
473 struct cl_io *parent = lio->lis_cl.cis_io;
474 struct lov_io_sub *sub;
477 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
479 rc = iofunc(sub->sub_env, sub->sub_io);
484 if (parent->ci_result == 0)
485 parent->ci_result = sub->sub_io->ci_result;
490 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
492 return lov_io_call(env, cl2lov_io(env, ios), cl_io_lock);
495 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
497 return lov_io_call(env, cl2lov_io(env, ios), cl_io_start);
500 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
503 * It's possible that lov_io_start() wasn't called against this
504 * sub-io, either because previous sub-io failed, or upper layer
507 if (io->ci_state == CIS_IO_GOING)
510 io->ci_state = CIS_IO_FINISHED;
514 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
516 cl_io_iter_fini(env, io);
520 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
522 cl_io_unlock(env, io);
526 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
530 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
534 static void lov_io_iter_fini(const struct lu_env *env,
535 const struct cl_io_slice *ios)
537 struct lov_io *lio = cl2lov_io(env, ios);
540 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
542 while (!list_empty(&lio->lis_active))
543 list_del_init(lio->lis_active.next);
546 static void lov_io_unlock(const struct lu_env *env,
547 const struct cl_io_slice *ios)
551 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
556 * lov implementation of cl_operations::cio_submit() method. It takes a list
557 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
558 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
561 * Major complication of this function is a need to handle memory cleansing:
562 * cl_io_submit() is called to write out pages as a part of VM memory
563 * reclamation, and hence it may not fail due to memory shortages (system
564 * dead-locks otherwise). To deal with this, some resources (sub-lists,
565 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
566 * not-memory cleansing context), and in case of memory shortage, these
567 * pre-allocated resources are used by lov_io_submit() under
568 * lov_device::ld_mutex mutex.
570 static int lov_io_submit(const struct lu_env *env,
571 const struct cl_io_slice *ios,
572 enum cl_req_type crt, struct cl_2queue *queue)
574 struct cl_page_list *qin = &queue->c2_qin;
575 struct lov_io *lio = cl2lov_io(env, ios);
576 struct lov_io_sub *sub;
577 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
578 struct cl_page *page;
583 if (lio->lis_active_subios == 1) {
584 int idx = lio->lis_single_subio_index;
586 LASSERT(idx < lio->lis_nr_subios);
587 sub = lov_sub_get(env, lio, idx);
588 LASSERT(!IS_ERR(sub));
589 LASSERT(sub->sub_io == &lio->lis_single_subio);
590 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
596 LASSERT(lio->lis_subs);
598 cl_page_list_init(plist);
599 while (qin->pl_nr > 0) {
600 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
602 cl_2queue_init(cl2q);
604 page = cl_page_list_first(qin);
605 cl_page_list_move(&cl2q->c2_qin, qin, page);
607 stripe = lov_page_stripe(page);
608 while (qin->pl_nr > 0) {
609 page = cl_page_list_first(qin);
610 if (stripe != lov_page_stripe(page))
613 cl_page_list_move(&cl2q->c2_qin, qin, page);
616 sub = lov_sub_get(env, lio, stripe);
618 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
625 cl_page_list_splice(&cl2q->c2_qin, plist);
626 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
627 cl_2queue_fini(env, cl2q);
633 cl_page_list_splice(plist, qin);
634 cl_page_list_fini(env, plist);
639 static int lov_io_commit_async(const struct lu_env *env,
640 const struct cl_io_slice *ios,
641 struct cl_page_list *queue, int from, int to,
644 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
645 struct lov_io *lio = cl2lov_io(env, ios);
646 struct lov_io_sub *sub;
647 struct cl_page *page;
650 if (lio->lis_active_subios == 1) {
651 int idx = lio->lis_single_subio_index;
653 LASSERT(idx < lio->lis_nr_subios);
654 sub = lov_sub_get(env, lio, idx);
655 LASSERT(!IS_ERR(sub));
656 LASSERT(sub->sub_io == &lio->lis_single_subio);
657 rc = cl_io_commit_async(sub->sub_env, sub->sub_io, queue,
663 LASSERT(lio->lis_subs);
665 cl_page_list_init(plist);
666 while (queue->pl_nr > 0) {
670 LASSERT(plist->pl_nr == 0);
671 page = cl_page_list_first(queue);
672 cl_page_list_move(plist, queue, page);
674 stripe = lov_page_stripe(page);
675 while (queue->pl_nr > 0) {
676 page = cl_page_list_first(queue);
677 if (stripe != lov_page_stripe(page))
680 cl_page_list_move(plist, queue, page);
683 if (queue->pl_nr > 0) /* still has more pages */
684 stripe_to = PAGE_SIZE;
686 sub = lov_sub_get(env, lio, stripe);
688 rc = cl_io_commit_async(sub->sub_env, sub->sub_io,
689 plist, from, stripe_to, cb);
696 if (plist->pl_nr > 0) /* short write */
702 /* for error case, add the page back into the qin list */
703 LASSERT(ergo(rc == 0, plist->pl_nr == 0));
704 while (plist->pl_nr > 0) {
705 /* error occurred, add the uncommitted pages back into queue */
706 page = cl_page_list_last(plist);
707 cl_page_list_move_head(queue, plist, page);
713 static int lov_io_fault_start(const struct lu_env *env,
714 const struct cl_io_slice *ios)
716 struct cl_fault_io *fio;
718 struct lov_io_sub *sub;
720 fio = &ios->cis_io->u.ci_fault;
721 lio = cl2lov_io(env, ios);
722 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
725 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
727 return lov_io_start(env, ios);
730 static void lov_io_fsync_end(const struct lu_env *env,
731 const struct cl_io_slice *ios)
733 struct lov_io *lio = cl2lov_io(env, ios);
734 struct lov_io_sub *sub;
735 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
738 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
739 struct cl_io *subio = sub->sub_io;
742 lov_io_end_wrapper(sub->sub_env, subio);
745 if (subio->ci_result == 0)
746 *written += subio->u.ci_fsync.fi_nr_written;
750 static const struct cl_io_operations lov_io_ops = {
753 .cio_fini = lov_io_fini,
754 .cio_iter_init = lov_io_rw_iter_init,
755 .cio_iter_fini = lov_io_iter_fini,
756 .cio_lock = lov_io_lock,
757 .cio_unlock = lov_io_unlock,
758 .cio_start = lov_io_start,
759 .cio_end = lov_io_end
762 .cio_fini = lov_io_fini,
763 .cio_iter_init = lov_io_rw_iter_init,
764 .cio_iter_fini = lov_io_iter_fini,
765 .cio_lock = lov_io_lock,
766 .cio_unlock = lov_io_unlock,
767 .cio_start = lov_io_start,
768 .cio_end = lov_io_end
771 .cio_fini = lov_io_fini,
772 .cio_iter_init = lov_io_iter_init,
773 .cio_iter_fini = lov_io_iter_fini,
774 .cio_lock = lov_io_lock,
775 .cio_unlock = lov_io_unlock,
776 .cio_start = lov_io_start,
777 .cio_end = lov_io_end
780 .cio_fini = lov_io_fini,
781 .cio_iter_init = lov_io_iter_init,
782 .cio_iter_fini = lov_io_iter_fini,
783 .cio_lock = lov_io_lock,
784 .cio_unlock = lov_io_unlock,
785 .cio_start = lov_io_fault_start,
786 .cio_end = lov_io_end
789 .cio_fini = lov_io_fini,
790 .cio_iter_init = lov_io_iter_init,
791 .cio_iter_fini = lov_io_iter_fini,
792 .cio_lock = lov_io_lock,
793 .cio_unlock = lov_io_unlock,
794 .cio_start = lov_io_start,
795 .cio_end = lov_io_fsync_end
798 .cio_fini = lov_io_fini
801 .cio_submit = lov_io_submit,
802 .cio_commit_async = lov_io_commit_async,
805 /*****************************************************************************
807 * Empty lov io operations.
811 static void lov_empty_io_fini(const struct lu_env *env,
812 const struct cl_io_slice *ios)
814 struct lov_object *lov = cl2lov(ios->cis_obj);
816 if (atomic_dec_and_test(&lov->lo_active_ios))
817 wake_up_all(&lov->lo_waitq);
820 static void lov_empty_impossible(const struct lu_env *env,
821 struct cl_io_slice *ios)
826 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
829 * An io operation vector for files without stripes.
831 static const struct cl_io_operations lov_empty_io_ops = {
834 .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
843 .cio_fini = lov_empty_io_fini,
844 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
845 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
846 .cio_start = LOV_EMPTY_IMPOSSIBLE,
847 .cio_end = LOV_EMPTY_IMPOSSIBLE
850 .cio_fini = lov_empty_io_fini,
851 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
852 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
853 .cio_start = LOV_EMPTY_IMPOSSIBLE,
854 .cio_end = LOV_EMPTY_IMPOSSIBLE
857 .cio_fini = lov_empty_io_fini,
858 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
859 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
860 .cio_start = LOV_EMPTY_IMPOSSIBLE,
861 .cio_end = LOV_EMPTY_IMPOSSIBLE
864 .cio_fini = lov_empty_io_fini
867 .cio_fini = lov_empty_io_fini
870 .cio_submit = LOV_EMPTY_IMPOSSIBLE,
871 .cio_commit_async = LOV_EMPTY_IMPOSSIBLE
874 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
877 struct lov_io *lio = lov_env_io(env);
878 struct lov_object *lov = cl2lov(obj);
880 INIT_LIST_HEAD(&lio->lis_active);
881 io->ci_result = lov_io_slice_init(lio, lov, io);
882 if (io->ci_result == 0) {
883 io->ci_result = lov_io_subio_init(env, lio, io);
884 if (io->ci_result == 0) {
885 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
886 atomic_inc(&lov->lo_active_ios);
889 return io->ci_result;
892 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
895 struct lov_object *lov = cl2lov(obj);
896 struct lov_io *lio = lov_env_io(env);
899 lio->lis_object = lov;
900 switch (io->ci_type) {
916 CERROR("Page fault on a file without stripes: "DFID"\n",
917 PFID(lu_object_fid(&obj->co_lu)));
921 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
922 atomic_inc(&lov->lo_active_ios);
925 io->ci_result = result < 0 ? result : 0;
929 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
932 struct lov_object *lov = cl2lov(obj);
933 struct lov_io *lio = lov_env_io(env);
936 LASSERT(lov->lo_lsm);
937 lio->lis_object = lov;
939 switch (io->ci_type) {
941 LASSERTF(0, "invalid type %d\n", io->ci_type);
947 /* the truncate to 0 is managed by MDT:
948 * - in open, for open O_TRUNC
949 * - in setattr, for truncate
951 /* the truncate is for size > 0 so triggers a restore */
952 if (cl_io_is_trunc(io))
953 io->ci_restore_needed = 1;
959 io->ci_restore_needed = 1;
964 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
965 atomic_inc(&lov->lo_active_ios);
968 io->ci_result = result < 0 ? result : 0;