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 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
104 io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
105 io->u.ci_setattr.sa_capa = parent->u.ci_setattr.sa_capa;
106 if (cl_io_is_trunc(io)) {
107 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
109 new_size = lov_size_to_stripe(lsm, new_size, stripe);
110 io->u.ci_setattr.sa_attr.lvb_size = new_size;
115 struct cl_object *obj = parent->ci_obj;
116 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
118 io->u.ci_fault = parent->u.ci_fault;
119 off = lov_size_to_stripe(lsm, off, stripe);
120 io->u.ci_fault.ft_index = cl_index(obj, off);
125 if (cl_io_is_append(parent)) {
126 io->u.ci_wr.wr_append = 1;
128 io->u.ci_rw.crw_pos = start;
129 io->u.ci_rw.crw_count = end - start;
138 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
139 struct lov_io_sub *sub)
141 struct lov_object *lov = lio->lis_object;
142 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
143 struct cl_io *sub_io;
144 struct cl_object *sub_obj;
145 struct cl_io *io = lio->lis_cl.cis_io;
147 int stripe = sub->sub_stripe;
150 LASSERT(sub->sub_io == NULL);
151 LASSERT(sub->sub_env == NULL);
152 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
156 sub->sub_io_initialized = 0;
157 sub->sub_borrowed = 0;
159 if (lio->lis_mem_frozen) {
160 LASSERT(cfs_mutex_is_locked(&ld->ld_mutex));
161 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
162 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
163 sub->sub_borrowed = 1;
167 /* obtain new environment */
168 cookie = cl_env_reenter();
169 sub->sub_env = cl_env_get(&sub->sub_refcheck);
170 cl_env_reexit(cookie);
171 if (IS_ERR(sub->sub_env))
172 result = PTR_ERR(sub->sub_env);
176 * First sub-io. Use ->lis_single_subio to
177 * avoid dynamic allocation.
179 if (lio->lis_active_subios == 0) {
180 sub->sub_io = &lio->lis_single_subio;
181 lio->lis_single_subio_index = stripe;
183 OBD_ALLOC_PTR(sub->sub_io);
184 if (sub->sub_io == NULL)
191 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
192 sub_io = sub->sub_io;
194 sub_io->ci_obj = sub_obj;
195 sub_io->ci_result = 0;
197 sub_io->ci_parent = io;
198 sub_io->ci_lockreq = io->ci_lockreq;
199 sub_io->ci_type = io->ci_type;
200 sub_io->ci_no_srvlock = io->ci_no_srvlock;
203 result = cl_io_sub_init(sub->sub_env, sub_io,
204 io->ci_type, sub_obj);
207 lio->lis_active_subios++;
208 sub->sub_io_initialized = 1;
213 lov_io_sub_fini(env, lio, sub);
217 struct lov_io_sub *lov_sub_get(const struct lu_env *env,
218 struct lov_io *lio, int stripe)
221 struct lov_io_sub *sub = &lio->lis_subs[stripe];
223 LASSERT(stripe < lio->lis_stripe_count);
226 if (!sub->sub_io_initialized) {
227 sub->sub_stripe = stripe;
228 rc = lov_io_sub_init(env, lio, sub);
238 void lov_sub_put(struct lov_io_sub *sub)
243 /*****************************************************************************
249 static int lov_page_stripe(const struct cl_page *page)
251 struct lovsub_object *subobj;
255 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
256 &lovsub_device_type));
257 LASSERT(subobj != NULL);
258 RETURN(subobj->lso_index);
261 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
262 const struct cl_page_slice *slice)
264 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
265 struct cl_page *page = slice->cpl_page;
268 LASSERT(lio->lis_cl.cis_io != NULL);
269 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
270 LASSERT(lsm != NULL);
271 LASSERT(lio->lis_nr_subios > 0);
274 stripe = lov_page_stripe(page);
275 RETURN(lov_sub_get(env, lio, stripe));
279 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
282 struct lov_object *lov = lio->lis_object;
283 struct lov_stripe_md *lsm = lov_r0(lov)->lo_lsm;
286 LASSERT(lio->lis_object != NULL);
290 * Need to be optimized, we can't afford to allocate a piece of memory
291 * when writing a page. -jay
293 OBD_ALLOC(lio->lis_subs,
294 lsm->lsm_stripe_count * sizeof lio->lis_subs[0]);
295 if (lio->lis_subs != NULL) {
296 lio->lis_nr_subios = lio->lis_stripe_count;
297 lio->lis_single_subio_index = -1;
298 lio->lis_active_subios = 0;
305 static void lov_io_slice_init(struct lov_io *lio,
306 struct lov_object *obj, struct cl_io *io)
308 struct lov_stripe_md *lsm = lov_r0(obj)->lo_lsm;
310 LASSERT(lsm != NULL);
314 lio->lis_object = obj;
315 lio->lis_stripe_count = lsm->lsm_stripe_count;
317 switch (io->ci_type) {
320 lio->lis_pos = io->u.ci_rw.crw_pos;
321 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
322 lio->lis_io_endpos = lio->lis_endpos;
323 if (cl_io_is_append(io)) {
324 LASSERT(io->ci_type == CIT_WRITE);
326 lio->lis_endpos = OBD_OBJECT_EOF;
331 if (cl_io_is_trunc(io))
332 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
335 lio->lis_endpos = OBD_OBJECT_EOF;
339 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);
347 lio->lis_endpos = OBD_OBJECT_EOF;
357 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
359 struct lov_io *lio = cl2lov_io(env, ios);
363 if (lio->lis_subs != NULL) {
364 for (i = 0; i < lio->lis_nr_subios; i++)
365 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
366 OBD_FREE(lio->lis_subs,
367 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
368 lio->lis_nr_subios = 0;
373 static obd_off lov_offset_mod(obd_off val, int delta)
375 if (val != OBD_OBJECT_EOF)
380 static int lov_io_iter_init(const struct lu_env *env,
381 const struct cl_io_slice *ios)
383 struct lov_io *lio = cl2lov_io(env, ios);
384 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
385 struct lov_io_sub *sub;
393 endpos = lov_offset_mod(lio->lis_endpos, -1);
394 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
395 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
396 endpos, &start, &end))
399 end = lov_offset_mod(end, +1);
400 sub = lov_sub_get(env, lio, stripe);
402 lov_io_sub_inherit(sub->sub_io, lio, stripe,
404 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
406 CDEBUG(D_VFSTRACE, "shrink: %i ["LPU64", "LPU64")\n",
412 cfs_list_add_tail(&sub->sub_linkage, &lio->lis_active);
419 static int lov_io_rw_iter_init(const struct lu_env *env,
420 const struct cl_io_slice *ios)
422 struct lov_io *lio = cl2lov_io(env, ios);
423 struct cl_io *io = ios->cis_io;
424 struct lov_stripe_md *lsm = lov_r0(cl2lov(ios->cis_obj))->lo_lsm;
425 loff_t start = io->u.ci_rw.crw_pos;
427 unsigned long ssize = lsm->lsm_stripe_size;
429 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
432 /* fast path for common case. */
433 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
435 do_div(start, ssize);
436 next = (start + 1) * ssize;
437 if (next <= start * ssize)
440 io->ci_continue = next < lio->lis_io_endpos;
441 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
442 next) - io->u.ci_rw.crw_pos;
443 lio->lis_pos = io->u.ci_rw.crw_pos;
444 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
445 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "LPU64"\n",
446 (__u64)start, lio->lis_pos, lio->lis_endpos,
447 (__u64)lio->lis_io_endpos);
450 * XXX The following call should be optimized: we know, that
451 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
453 RETURN(lov_io_iter_init(env, ios));
456 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
457 int (*iofunc)(const struct lu_env *, struct cl_io *))
459 struct lov_io_sub *sub;
463 cfs_list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
465 rc = iofunc(sub->sub_env, sub->sub_io);
473 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
476 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
479 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
482 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
485 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
489 * It's possible that lov_io_start() wasn't called against this
490 * sub-io, either because previous sub-io failed, or upper layer
493 if (io->ci_state == CIS_IO_GOING)
496 io->ci_state = CIS_IO_FINISHED;
500 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
502 cl_io_iter_fini(env, io);
506 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
508 cl_io_unlock(env, io);
512 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
516 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
520 static void lov_io_iter_fini(const struct lu_env *env,
521 const struct cl_io_slice *ios)
523 struct lov_io *lio = cl2lov_io(env, ios);
527 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
529 while (!cfs_list_empty(&lio->lis_active))
530 cfs_list_del_init(lio->lis_active.next);
534 static void lov_io_unlock(const struct lu_env *env,
535 const struct cl_io_slice *ios)
540 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
546 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
547 struct cl_page_list *qin,
550 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
554 * lov implementation of cl_operations::cio_submit() method. It takes a list
555 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
556 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
559 * Major complication of this function is a need to handle memory cleansing:
560 * cl_io_submit() is called to write out pages as a part of VM memory
561 * reclamation, and hence it may not fail due to memory shortages (system
562 * dead-locks otherwise). To deal with this, some resources (sub-lists,
563 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
564 * not-memory cleansing context), and in case of memory shortage, these
565 * pre-allocated resources are used by lov_io_submit() under
566 * lov_device::ld_mutex mutex.
568 static int lov_io_submit(const struct lu_env *env,
569 const struct cl_io_slice *ios,
570 enum cl_req_type crt, struct cl_2queue *queue,
571 enum cl_req_priority priority)
573 struct lov_io *lio = cl2lov_io(env, ios);
574 struct lov_object *obj = lio->lis_object;
575 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
576 struct cl_page_list *qin = &queue->c2_qin;
577 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
578 struct cl_page_list *stripes_qin = NULL;
579 struct cl_page *page;
583 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
587 #if defined(__KERNEL__) && defined(__linux__)
588 !(current->flags & PF_MEMALLOC);
593 if (lio->lis_active_subios == 1) {
594 int idx = lio->lis_single_subio_index;
595 struct lov_io_sub *sub;
597 LASSERT(idx < lio->lis_nr_subios);
598 sub = lov_sub_get(env, lio, idx);
599 LASSERT(!IS_ERR(sub));
600 LASSERT(sub->sub_io == &lio->lis_single_subio);
601 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
602 crt, queue, priority);
607 LASSERT(lio->lis_subs != NULL);
609 OBD_ALLOC(stripes_qin,
610 sizeof(*stripes_qin) * lio->lis_nr_subios);
611 if (stripes_qin == NULL)
614 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
615 cl_page_list_init(&stripes_qin[stripe]);
618 * If we get here, it means pageout & swap doesn't help.
619 * In order to not make things worse, even don't try to
620 * allocate the memory with __GFP_NOWARN. -jay
622 cfs_mutex_lock(&ld->ld_mutex);
623 lio->lis_mem_frozen = 1;
626 cl_2queue_init(cl2q);
627 cl_page_list_for_each_safe(page, tmp, qin) {
628 stripe = lov_page_stripe(page);
629 cl_page_list_move(QIN(stripe), qin, page);
632 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
633 struct lov_io_sub *sub;
634 struct cl_page_list *sub_qin = QIN(stripe);
636 if (cfs_list_empty(&sub_qin->pl_pages))
639 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
640 sub = lov_sub_get(env, lio, stripe);
642 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
643 crt, cl2q, priority);
647 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
648 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
653 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
654 struct cl_page_list *sub_qin = QIN(stripe);
656 if (cfs_list_empty(&sub_qin->pl_pages))
659 cl_page_list_splice(sub_qin, qin);
663 OBD_FREE(stripes_qin,
664 sizeof(*stripes_qin) * lio->lis_nr_subios);
668 for (i = 0; i < lio->lis_nr_subios; i++) {
669 struct cl_io *cio = lio->lis_subs[i].sub_io;
671 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
672 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
674 lio->lis_mem_frozen = 0;
675 cfs_mutex_unlock(&ld->ld_mutex);
682 static int lov_io_prepare_write(const struct lu_env *env,
683 const struct cl_io_slice *ios,
684 const struct cl_page_slice *slice,
685 unsigned from, unsigned to)
687 struct lov_io *lio = cl2lov_io(env, ios);
688 struct cl_page *sub_page = lov_sub_page(slice);
689 struct lov_io_sub *sub;
693 sub = lov_page_subio(env, lio, slice);
695 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
699 result = PTR_ERR(sub);
703 static int lov_io_commit_write(const struct lu_env *env,
704 const struct cl_io_slice *ios,
705 const struct cl_page_slice *slice,
706 unsigned from, unsigned to)
708 struct lov_io *lio = cl2lov_io(env, ios);
709 struct cl_page *sub_page = lov_sub_page(slice);
710 struct lov_io_sub *sub;
714 sub = lov_page_subio(env, lio, slice);
716 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
720 result = PTR_ERR(sub);
724 static int lov_io_fault_start(const struct lu_env *env,
725 const struct cl_io_slice *ios)
727 struct cl_fault_io *fio;
729 struct lov_io_sub *sub;
732 fio = &ios->cis_io->u.ci_fault;
733 lio = cl2lov_io(env, ios);
734 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
735 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
737 RETURN(lov_io_start(env, ios));
740 static const struct cl_io_operations lov_io_ops = {
743 .cio_fini = lov_io_fini,
744 .cio_iter_init = lov_io_rw_iter_init,
745 .cio_iter_fini = lov_io_iter_fini,
746 .cio_lock = lov_io_lock,
747 .cio_unlock = lov_io_unlock,
748 .cio_start = lov_io_start,
749 .cio_end = lov_io_end
752 .cio_fini = lov_io_fini,
753 .cio_iter_init = lov_io_rw_iter_init,
754 .cio_iter_fini = lov_io_iter_fini,
755 .cio_lock = lov_io_lock,
756 .cio_unlock = lov_io_unlock,
757 .cio_start = lov_io_start,
758 .cio_end = lov_io_end
761 .cio_fini = lov_io_fini,
762 .cio_iter_init = lov_io_iter_init,
763 .cio_iter_fini = lov_io_iter_fini,
764 .cio_lock = lov_io_lock,
765 .cio_unlock = lov_io_unlock,
766 .cio_start = lov_io_start,
767 .cio_end = lov_io_end
770 .cio_fini = lov_io_fini,
771 .cio_iter_init = lov_io_iter_init,
772 .cio_iter_fini = lov_io_iter_fini,
773 .cio_lock = lov_io_lock,
774 .cio_unlock = lov_io_unlock,
775 .cio_start = lov_io_fault_start,
776 .cio_end = lov_io_end
779 .cio_fini = lov_io_fini
784 .cio_submit = lov_io_submit
787 .cio_submit = lov_io_submit
790 .cio_prepare_write = lov_io_prepare_write,
791 .cio_commit_write = lov_io_commit_write
794 /*****************************************************************************
796 * Empty lov io operations.
800 static void lov_empty_io_fini(const struct lu_env *env,
801 const struct cl_io_slice *ios)
807 static void lov_empty_impossible(const struct lu_env *env,
808 struct cl_io_slice *ios)
813 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
816 * An io operation vector for files without stripes.
818 static const struct cl_io_operations lov_empty_io_ops = {
822 .cio_fini = lov_empty_io_fini,
823 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
824 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
825 .cio_start = LOV_EMPTY_IMPOSSIBLE,
826 .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,
845 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
846 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
847 .cio_start = LOV_EMPTY_IMPOSSIBLE,
848 .cio_end = LOV_EMPTY_IMPOSSIBLE
851 .cio_fini = lov_empty_io_fini
856 .cio_submit = LOV_EMPTY_IMPOSSIBLE
859 .cio_submit = LOV_EMPTY_IMPOSSIBLE
862 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
865 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
868 struct lov_io *lio = lov_env_io(env);
869 struct lov_object *lov = cl2lov(obj);
872 CFS_INIT_LIST_HEAD(&lio->lis_active);
873 lov_io_slice_init(lio, lov, io);
874 if (io->ci_result == 0) {
875 LASSERT(lov_r0(lov)->lo_lsm != NULL);
876 io->ci_result = lov_io_subio_init(env, lio, io);
877 if (io->ci_result == 0)
878 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
880 RETURN(io->ci_result);
883 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
886 struct lov_io *lio = lov_env_io(env);
890 switch (io->ci_type) {
903 CERROR("Page fault on a file without stripes: "DFID"\n",
904 PFID(lu_object_fid(&obj->co_lu)));
908 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
909 io->ci_result = result;