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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, Whamcloud, Inc.
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 inline void lov_sub_enter(struct lov_io_sub *sub)
53 static inline void lov_sub_exit(struct lov_io_sub *sub)
58 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
59 struct lov_io_sub *sub)
62 if (sub->sub_io != NULL) {
63 if (sub->sub_io_initialized) {
65 cl_io_fini(sub->sub_env, sub->sub_io);
67 sub->sub_io_initialized = 0;
68 lio->lis_active_subios--;
70 if (sub->sub_stripe == lio->lis_single_subio_index)
71 lio->lis_single_subio_index = -1;
72 else if (!sub->sub_borrowed)
73 OBD_FREE_PTR(sub->sub_io);
76 if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
77 if (!sub->sub_borrowed)
78 cl_env_put(sub->sub_env, &sub->sub_refcheck);
84 static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
85 int stripe, loff_t start, loff_t end)
87 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
88 struct cl_io *parent = lio->lis_cl.cis_io;
92 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
93 io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
94 io->u.ci_setattr.sa_capa = parent->u.ci_setattr.sa_capa;
95 if (cl_io_is_trunc(io)) {
96 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
98 new_size = lov_size_to_stripe(lsm, new_size, stripe);
99 io->u.ci_setattr.sa_attr.lvb_size = new_size;
104 struct cl_object *obj = parent->ci_obj;
105 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
107 io->u.ci_fault = parent->u.ci_fault;
108 off = lov_size_to_stripe(lsm, off, stripe);
109 io->u.ci_fault.ft_index = cl_index(obj, off);
113 io->u.ci_fsync.fi_start = start;
114 io->u.ci_fsync.fi_end = end;
115 io->u.ci_fsync.fi_capa = parent->u.ci_fsync.fi_capa;
116 io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
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(cfs_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_LARGE(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 if (cl_io_is_trunc(io))
328 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
331 lio->lis_endpos = OBD_OBJECT_EOF;
335 pgoff_t index = io->u.ci_fault.ft_index;
336 lio->lis_pos = cl_offset(io->ci_obj, index);
337 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
342 lio->lis_pos = io->u.ci_fsync.fi_start;
343 lio->lis_endpos = io->u.ci_fsync.fi_end;
349 lio->lis_endpos = OBD_OBJECT_EOF;
359 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
361 struct lov_io *lio = cl2lov_io(env, ios);
365 if (lio->lis_subs != NULL) {
366 for (i = 0; i < lio->lis_nr_subios; i++)
367 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
368 OBD_FREE_LARGE(lio->lis_subs,
369 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
370 lio->lis_nr_subios = 0;
375 static obd_off lov_offset_mod(obd_off val, int delta)
377 if (val != OBD_OBJECT_EOF)
382 static int lov_io_iter_init(const struct lu_env *env,
383 const struct cl_io_slice *ios)
385 struct lov_io *lio = cl2lov_io(env, ios);
386 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
387 struct lov_io_sub *sub;
395 endpos = lov_offset_mod(lio->lis_endpos, -1);
396 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
397 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
398 endpos, &start, &end))
401 end = lov_offset_mod(end, +1);
402 sub = lov_sub_get(env, lio, stripe);
404 lov_io_sub_inherit(sub->sub_io, lio, stripe,
406 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
408 CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
414 cfs_list_add_tail(&sub->sub_linkage, &lio->lis_active);
421 static int lov_io_rw_iter_init(const struct lu_env *env,
422 const struct cl_io_slice *ios)
424 struct lov_io *lio = cl2lov_io(env, ios);
425 struct cl_io *io = ios->cis_io;
426 struct lov_stripe_md *lsm = lov_r0(cl2lov(ios->cis_obj))->lo_lsm;
427 loff_t start = io->u.ci_rw.crw_pos;
429 unsigned long ssize = lsm->lsm_stripe_size;
431 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
434 /* fast path for common case. */
435 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
437 lov_do_div64(start, ssize);
438 next = (start + 1) * ssize;
439 if (next <= start * ssize)
442 io->ci_continue = next < lio->lis_io_endpos;
443 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
444 next) - io->u.ci_rw.crw_pos;
445 lio->lis_pos = io->u.ci_rw.crw_pos;
446 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
447 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
448 LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
449 (__u64)lio->lis_io_endpos);
452 * XXX The following call should be optimized: we know, that
453 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
455 RETURN(lov_io_iter_init(env, ios));
458 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
459 int (*iofunc)(const struct lu_env *, struct cl_io *))
461 struct cl_io *parent = lio->lis_cl.cis_io;
462 struct lov_io_sub *sub;
466 cfs_list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
468 rc = iofunc(sub->sub_env, sub->sub_io);
473 if (parent->ci_result == 0)
474 parent->ci_result = sub->sub_io->ci_result;
479 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
482 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
485 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
488 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
491 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);
533 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
535 while (!cfs_list_empty(&lio->lis_active))
536 cfs_list_del_init(lio->lis_active.next);
540 static void lov_io_unlock(const struct lu_env *env,
541 const struct cl_io_slice *ios)
546 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
552 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
553 struct cl_page_list *qin,
556 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
560 * lov implementation of cl_operations::cio_submit() method. It takes a list
561 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
562 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
565 * Major complication of this function is a need to handle memory cleansing:
566 * cl_io_submit() is called to write out pages as a part of VM memory
567 * reclamation, and hence it may not fail due to memory shortages (system
568 * dead-locks otherwise). To deal with this, some resources (sub-lists,
569 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
570 * not-memory cleansing context), and in case of memory shortage, these
571 * pre-allocated resources are used by lov_io_submit() under
572 * lov_device::ld_mutex mutex.
574 static int lov_io_submit(const struct lu_env *env,
575 const struct cl_io_slice *ios,
576 enum cl_req_type crt, struct cl_2queue *queue,
577 enum cl_req_priority priority)
579 struct lov_io *lio = cl2lov_io(env, ios);
580 struct lov_object *obj = lio->lis_object;
581 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
582 struct cl_page_list *qin = &queue->c2_qin;
583 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
584 struct cl_page_list *stripes_qin = NULL;
585 struct cl_page *page;
589 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
593 #if defined(__KERNEL__) && defined(__linux__)
594 !(current->flags & PF_MEMALLOC);
599 if (lio->lis_active_subios == 1) {
600 int idx = lio->lis_single_subio_index;
601 struct lov_io_sub *sub;
603 LASSERT(idx < lio->lis_nr_subios);
604 sub = lov_sub_get(env, lio, idx);
605 LASSERT(!IS_ERR(sub));
606 LASSERT(sub->sub_io == &lio->lis_single_subio);
607 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
608 crt, queue, priority);
613 LASSERT(lio->lis_subs != NULL);
615 OBD_ALLOC_LARGE(stripes_qin,
616 sizeof(*stripes_qin) * lio->lis_nr_subios);
617 if (stripes_qin == NULL)
620 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
621 cl_page_list_init(&stripes_qin[stripe]);
624 * If we get here, it means pageout & swap doesn't help.
625 * In order to not make things worse, even don't try to
626 * allocate the memory with __GFP_NOWARN. -jay
628 cfs_mutex_lock(&ld->ld_mutex);
629 lio->lis_mem_frozen = 1;
632 cl_2queue_init(cl2q);
633 cl_page_list_for_each_safe(page, tmp, qin) {
634 stripe = lov_page_stripe(page);
635 cl_page_list_move(QIN(stripe), qin, page);
638 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
639 struct lov_io_sub *sub;
640 struct cl_page_list *sub_qin = QIN(stripe);
642 if (cfs_list_empty(&sub_qin->pl_pages))
645 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
646 sub = lov_sub_get(env, lio, stripe);
648 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
649 crt, cl2q, priority);
653 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
654 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
659 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
660 struct cl_page_list *sub_qin = QIN(stripe);
662 if (cfs_list_empty(&sub_qin->pl_pages))
665 cl_page_list_splice(sub_qin, qin);
669 OBD_FREE_LARGE(stripes_qin,
670 sizeof(*stripes_qin) * lio->lis_nr_subios);
674 for (i = 0; i < lio->lis_nr_subios; i++) {
675 struct cl_io *cio = lio->lis_subs[i].sub_io;
677 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
678 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
680 lio->lis_mem_frozen = 0;
681 cfs_mutex_unlock(&ld->ld_mutex);
688 static int lov_io_prepare_write(const struct lu_env *env,
689 const struct cl_io_slice *ios,
690 const struct cl_page_slice *slice,
691 unsigned from, unsigned to)
693 struct lov_io *lio = cl2lov_io(env, ios);
694 struct cl_page *sub_page = lov_sub_page(slice);
695 struct lov_io_sub *sub;
699 sub = lov_page_subio(env, lio, slice);
701 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
705 result = PTR_ERR(sub);
709 static int lov_io_commit_write(const struct lu_env *env,
710 const struct cl_io_slice *ios,
711 const struct cl_page_slice *slice,
712 unsigned from, unsigned to)
714 struct lov_io *lio = cl2lov_io(env, ios);
715 struct cl_page *sub_page = lov_sub_page(slice);
716 struct lov_io_sub *sub;
720 sub = lov_page_subio(env, lio, slice);
722 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
726 result = PTR_ERR(sub);
730 static int lov_io_fault_start(const struct lu_env *env,
731 const struct cl_io_slice *ios)
733 struct cl_fault_io *fio;
735 struct lov_io_sub *sub;
738 fio = &ios->cis_io->u.ci_fault;
739 lio = cl2lov_io(env, ios);
740 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
741 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
743 RETURN(lov_io_start(env, ios));
746 static const struct cl_io_operations lov_io_ops = {
749 .cio_fini = lov_io_fini,
750 .cio_iter_init = lov_io_rw_iter_init,
751 .cio_iter_fini = lov_io_iter_fini,
752 .cio_lock = lov_io_lock,
753 .cio_unlock = lov_io_unlock,
754 .cio_start = lov_io_start,
755 .cio_end = lov_io_end
758 .cio_fini = lov_io_fini,
759 .cio_iter_init = lov_io_rw_iter_init,
760 .cio_iter_fini = lov_io_iter_fini,
761 .cio_lock = lov_io_lock,
762 .cio_unlock = lov_io_unlock,
763 .cio_start = lov_io_start,
764 .cio_end = lov_io_end
767 .cio_fini = lov_io_fini,
768 .cio_iter_init = lov_io_iter_init,
769 .cio_iter_fini = lov_io_iter_fini,
770 .cio_lock = lov_io_lock,
771 .cio_unlock = lov_io_unlock,
772 .cio_start = lov_io_start,
773 .cio_end = lov_io_end
776 .cio_fini = lov_io_fini,
777 .cio_iter_init = lov_io_iter_init,
778 .cio_iter_fini = lov_io_iter_fini,
779 .cio_lock = lov_io_lock,
780 .cio_unlock = lov_io_unlock,
781 .cio_start = lov_io_fault_start,
782 .cio_end = lov_io_end
785 .cio_fini = lov_io_fini,
786 .cio_iter_init = lov_io_iter_init,
787 .cio_iter_fini = lov_io_iter_fini,
788 .cio_lock = lov_io_lock,
789 .cio_unlock = lov_io_unlock,
790 .cio_start = lov_io_start,
791 .cio_end = lov_io_end
794 .cio_fini = lov_io_fini
799 .cio_submit = lov_io_submit
802 .cio_submit = lov_io_submit
805 .cio_prepare_write = lov_io_prepare_write,
806 .cio_commit_write = lov_io_commit_write
809 /*****************************************************************************
811 * Empty lov io operations.
815 static void lov_empty_io_fini(const struct lu_env *env,
816 const struct cl_io_slice *ios)
822 static void lov_empty_impossible(const struct lu_env *env,
823 struct cl_io_slice *ios)
828 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
831 * An io operation vector for files without stripes.
833 static const struct cl_io_operations lov_empty_io_ops = {
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
845 .cio_fini = lov_empty_io_fini,
846 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
847 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
848 .cio_start = LOV_EMPTY_IMPOSSIBLE,
849 .cio_end = LOV_EMPTY_IMPOSSIBLE
852 .cio_fini = lov_empty_io_fini,
853 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
854 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
855 .cio_start = LOV_EMPTY_IMPOSSIBLE,
856 .cio_end = LOV_EMPTY_IMPOSSIBLE
859 .cio_fini = lov_empty_io_fini,
860 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
861 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
862 .cio_start = LOV_EMPTY_IMPOSSIBLE,
863 .cio_end = LOV_EMPTY_IMPOSSIBLE
866 .cio_fini = lov_empty_io_fini
869 .cio_fini = lov_empty_io_fini
874 .cio_submit = LOV_EMPTY_IMPOSSIBLE
877 .cio_submit = LOV_EMPTY_IMPOSSIBLE
880 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
883 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
886 struct lov_io *lio = lov_env_io(env);
887 struct lov_object *lov = cl2lov(obj);
890 CFS_INIT_LIST_HEAD(&lio->lis_active);
891 lov_io_slice_init(lio, lov, io);
892 if (io->ci_result == 0) {
893 LASSERT(lov_r0(lov)->lo_lsm != NULL);
894 io->ci_result = lov_io_subio_init(env, lio, io);
895 if (io->ci_result == 0)
896 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
898 RETURN(io->ci_result);
901 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
904 struct lov_io *lio = lov_env_io(env);
908 switch (io->ci_type) {
922 CERROR("Page fault on a file without stripes: "DFID"\n",
923 PFID(lu_object_fid(&obj->co_lu)));
927 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
928 io->ci_result = result;