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>
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
42 #define DEBUG_SUBSYSTEM S_LOV
44 #include "lov_cl_internal.h"
50 static inline void lov_sub_enter(struct lov_io_sub *sub)
54 static inline void lov_sub_exit(struct lov_io_sub *sub)
59 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
60 struct lov_io_sub *sub)
63 if (sub->sub_io != NULL) {
64 if (sub->sub_io_initialized) {
66 cl_io_fini(sub->sub_env, sub->sub_io);
68 sub->sub_io_initialized = 0;
69 lio->lis_active_subios--;
71 if (sub->sub_stripe == lio->lis_single_subio_index)
72 lio->lis_single_subio_index = -1;
73 else if (!sub->sub_borrowed)
74 OBD_FREE_PTR(sub->sub_io);
77 if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
78 if (!sub->sub_borrowed)
79 cl_env_put(sub->sub_env, &sub->sub_refcheck);
85 static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
86 int stripe, loff_t start, loff_t end)
88 struct lov_stripe_md *lsm = lio->lis_lsm;
89 struct cl_io *parent = lio->lis_cl.cis_io;
93 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
94 io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
95 io->u.ci_setattr.sa_capa = parent->u.ci_setattr.sa_capa;
96 if (cl_io_is_trunc(io)) {
97 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
99 new_size = lov_size_to_stripe(lsm, new_size, stripe);
100 io->u.ci_setattr.sa_attr.lvb_size = new_size;
105 struct cl_object *obj = parent->ci_obj;
106 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
108 io->u.ci_fault = parent->u.ci_fault;
109 off = lov_size_to_stripe(lsm, off, stripe);
110 io->u.ci_fault.ft_index = cl_index(obj, off);
114 io->u.ci_fsync.fi_start = start;
115 io->u.ci_fsync.fi_end = end;
116 io->u.ci_fsync.fi_capa = parent->u.ci_fsync.fi_capa;
117 io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
118 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
123 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
124 if (cl_io_is_append(parent)) {
125 io->u.ci_wr.wr_append = 1;
127 io->u.ci_rw.crw_pos = start;
128 io->u.ci_rw.crw_count = end - start;
137 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
138 struct lov_io_sub *sub)
140 struct lov_object *lov = lio->lis_object;
141 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
142 struct cl_io *sub_io;
143 struct cl_object *sub_obj;
144 struct cl_io *io = lio->lis_cl.cis_io;
146 int stripe = sub->sub_stripe;
149 LASSERT(sub->sub_io == NULL);
150 LASSERT(sub->sub_env == NULL);
151 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
155 sub->sub_io_initialized = 0;
156 sub->sub_borrowed = 0;
158 if (lio->lis_mem_frozen) {
159 LASSERT(cfs_mutex_is_locked(&ld->ld_mutex));
160 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
161 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
162 sub->sub_borrowed = 1;
166 /* obtain new environment */
167 cookie = cl_env_reenter();
168 sub->sub_env = cl_env_get(&sub->sub_refcheck);
169 cl_env_reexit(cookie);
170 if (IS_ERR(sub->sub_env))
171 result = PTR_ERR(sub->sub_env);
175 * First sub-io. Use ->lis_single_subio to
176 * avoid dynamic allocation.
178 if (lio->lis_active_subios == 0) {
179 sub->sub_io = &lio->lis_single_subio;
180 lio->lis_single_subio_index = stripe;
182 OBD_ALLOC_PTR(sub->sub_io);
183 if (sub->sub_io == NULL)
190 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
191 sub_io = sub->sub_io;
193 sub_io->ci_obj = sub_obj;
194 sub_io->ci_result = 0;
196 sub_io->ci_parent = io;
197 sub_io->ci_lockreq = io->ci_lockreq;
198 sub_io->ci_type = io->ci_type;
199 sub_io->ci_no_srvlock = io->ci_no_srvlock;
202 result = cl_io_sub_init(sub->sub_env, sub_io,
203 io->ci_type, sub_obj);
206 lio->lis_active_subios++;
207 sub->sub_io_initialized = 1;
212 lov_io_sub_fini(env, lio, sub);
216 struct lov_io_sub *lov_sub_get(const struct lu_env *env,
217 struct lov_io *lio, int stripe)
220 struct lov_io_sub *sub = &lio->lis_subs[stripe];
222 LASSERT(stripe < lio->lis_stripe_count);
225 if (!sub->sub_io_initialized) {
226 sub->sub_stripe = stripe;
227 rc = lov_io_sub_init(env, lio, sub);
237 void lov_sub_put(struct lov_io_sub *sub)
242 /*****************************************************************************
248 static int lov_page_stripe(const struct cl_page *page)
250 struct lovsub_object *subobj;
254 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
255 &lovsub_device_type));
256 LASSERT(subobj != NULL);
257 RETURN(subobj->lso_index);
260 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
261 const struct cl_page_slice *slice)
263 struct lov_stripe_md *lsm = lio->lis_lsm;
264 struct cl_page *page = slice->cpl_page;
267 LASSERT(lio->lis_cl.cis_io != NULL);
268 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
269 LASSERT(lsm != NULL);
270 LASSERT(lio->lis_nr_subios > 0);
273 stripe = lov_page_stripe(page);
274 RETURN(lov_sub_get(env, lio, stripe));
278 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
281 struct lov_stripe_md *lsm = lio->lis_lsm;
284 LASSERT(lio->lis_object != NULL);
288 * Need to be optimized, we can't afford to allocate a piece of memory
289 * when writing a page. -jay
291 OBD_ALLOC_LARGE(lio->lis_subs,
292 lsm->lsm_stripe_count * sizeof lio->lis_subs[0]);
293 if (lio->lis_subs != NULL) {
294 lio->lis_nr_subios = lio->lis_stripe_count;
295 lio->lis_single_subio_index = -1;
296 lio->lis_active_subios = 0;
303 static void lov_io_slice_init(struct lov_io *lio,
304 struct lov_object *obj, struct cl_io *io)
309 lio->lis_object = obj;
311 LASSERT(lio->lis_lsm != NULL);
312 lio->lis_stripe_count = lio->lis_lsm->lsm_stripe_count;
314 switch (io->ci_type) {
317 lio->lis_pos = io->u.ci_rw.crw_pos;
318 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
319 lio->lis_io_endpos = lio->lis_endpos;
320 if (cl_io_is_append(io)) {
321 LASSERT(io->ci_type == CIT_WRITE);
323 lio->lis_endpos = OBD_OBJECT_EOF;
328 if (cl_io_is_trunc(io))
329 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
332 lio->lis_endpos = OBD_OBJECT_EOF;
336 pgoff_t index = io->u.ci_fault.ft_index;
337 lio->lis_pos = cl_offset(io->ci_obj, index);
338 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
343 lio->lis_pos = io->u.ci_fsync.fi_start;
344 lio->lis_endpos = io->u.ci_fsync.fi_end;
350 lio->lis_endpos = OBD_OBJECT_EOF;
360 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
362 struct lov_io *lio = cl2lov_io(env, ios);
366 if (lio->lis_subs != NULL) {
367 for (i = 0; i < lio->lis_nr_subios; i++)
368 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
369 OBD_FREE_LARGE(lio->lis_subs,
370 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
371 lio->lis_nr_subios = 0;
373 lov_lsm_decref(lio->lis_object, lio->lis_lsm);
378 static obd_off lov_offset_mod(obd_off val, int delta)
380 if (val != OBD_OBJECT_EOF)
385 static int lov_io_iter_init(const struct lu_env *env,
386 const struct cl_io_slice *ios)
388 struct lov_io *lio = cl2lov_io(env, ios);
389 struct lov_stripe_md *lsm = lio->lis_lsm;
390 struct lov_io_sub *sub;
398 endpos = lov_offset_mod(lio->lis_endpos, -1);
399 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
400 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
401 endpos, &start, &end))
404 end = lov_offset_mod(end, +1);
405 sub = lov_sub_get(env, lio, stripe);
407 lov_io_sub_inherit(sub->sub_io, lio, stripe,
409 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
411 CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
417 cfs_list_add_tail(&sub->sub_linkage, &lio->lis_active);
424 static int lov_io_rw_iter_init(const struct lu_env *env,
425 const struct cl_io_slice *ios)
427 struct lov_io *lio = cl2lov_io(env, ios);
428 struct cl_io *io = ios->cis_io;
429 struct lov_stripe_md *lsm = lio->lis_lsm;
430 loff_t start = io->u.ci_rw.crw_pos;
432 unsigned long ssize = lsm->lsm_stripe_size;
434 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
437 /* fast path for common case. */
438 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
440 lov_do_div64(start, ssize);
441 next = (start + 1) * ssize;
442 if (next <= start * ssize)
445 io->ci_continue = next < lio->lis_io_endpos;
446 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
447 next) - io->u.ci_rw.crw_pos;
448 lio->lis_pos = io->u.ci_rw.crw_pos;
449 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
450 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
451 LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
452 (__u64)lio->lis_io_endpos);
455 * XXX The following call should be optimized: we know, that
456 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
458 RETURN(lov_io_iter_init(env, ios));
461 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
462 int (*iofunc)(const struct lu_env *, struct cl_io *))
464 struct cl_io *parent = lio->lis_cl.cis_io;
465 struct lov_io_sub *sub;
469 cfs_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)
485 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
488 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
491 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
494 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
498 * It's possible that lov_io_start() wasn't called against this
499 * sub-io, either because previous sub-io failed, or upper layer
502 if (io->ci_state == CIS_IO_GOING)
505 io->ci_state = CIS_IO_FINISHED;
509 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
511 cl_io_iter_fini(env, io);
515 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
517 cl_io_unlock(env, io);
521 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
525 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
529 static void lov_io_iter_fini(const struct lu_env *env,
530 const struct cl_io_slice *ios)
532 struct lov_io *lio = cl2lov_io(env, ios);
536 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
538 while (!cfs_list_empty(&lio->lis_active))
539 cfs_list_del_init(lio->lis_active.next);
543 static void lov_io_unlock(const struct lu_env *env,
544 const struct cl_io_slice *ios)
549 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
555 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
556 struct cl_page_list *qin,
559 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
563 * lov implementation of cl_operations::cio_submit() method. It takes a list
564 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
565 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
568 * Major complication of this function is a need to handle memory cleansing:
569 * cl_io_submit() is called to write out pages as a part of VM memory
570 * reclamation, and hence it may not fail due to memory shortages (system
571 * dead-locks otherwise). To deal with this, some resources (sub-lists,
572 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
573 * not-memory cleansing context), and in case of memory shortage, these
574 * pre-allocated resources are used by lov_io_submit() under
575 * lov_device::ld_mutex mutex.
577 static int lov_io_submit(const struct lu_env *env,
578 const struct cl_io_slice *ios,
579 enum cl_req_type crt, struct cl_2queue *queue)
581 struct lov_io *lio = cl2lov_io(env, ios);
582 struct lov_object *obj = lio->lis_object;
583 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
584 struct cl_page_list *qin = &queue->c2_qin;
585 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
586 struct cl_page_list *stripes_qin = NULL;
587 struct cl_page *page;
591 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
595 #if defined(__KERNEL__) && defined(__linux__)
596 !(current->flags & PF_MEMALLOC);
601 if (lio->lis_active_subios == 1) {
602 int idx = lio->lis_single_subio_index;
603 struct lov_io_sub *sub;
605 LASSERT(idx < lio->lis_nr_subios);
606 sub = lov_sub_get(env, lio, idx);
607 LASSERT(!IS_ERR(sub));
608 LASSERT(sub->sub_io == &lio->lis_single_subio);
609 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
615 LASSERT(lio->lis_subs != NULL);
617 OBD_ALLOC_LARGE(stripes_qin,
618 sizeof(*stripes_qin) * lio->lis_nr_subios);
619 if (stripes_qin == NULL)
622 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
623 cl_page_list_init(&stripes_qin[stripe]);
626 * If we get here, it means pageout & swap doesn't help.
627 * In order to not make things worse, even don't try to
628 * allocate the memory with __GFP_NOWARN. -jay
630 cfs_mutex_lock(&ld->ld_mutex);
631 lio->lis_mem_frozen = 1;
634 cl_2queue_init(cl2q);
635 cl_page_list_for_each_safe(page, tmp, qin) {
636 stripe = lov_page_stripe(page);
637 cl_page_list_move(QIN(stripe), qin, page);
640 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
641 struct lov_io_sub *sub;
642 struct cl_page_list *sub_qin = QIN(stripe);
644 if (cfs_list_empty(&sub_qin->pl_pages))
647 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
648 sub = lov_sub_get(env, lio, stripe);
650 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
655 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
656 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
661 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
662 struct cl_page_list *sub_qin = QIN(stripe);
664 if (cfs_list_empty(&sub_qin->pl_pages))
667 cl_page_list_splice(sub_qin, qin);
671 OBD_FREE_LARGE(stripes_qin,
672 sizeof(*stripes_qin) * lio->lis_nr_subios);
676 for (i = 0; i < lio->lis_nr_subios; i++) {
677 struct cl_io *cio = lio->lis_subs[i].sub_io;
679 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
680 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
682 lio->lis_mem_frozen = 0;
683 cfs_mutex_unlock(&ld->ld_mutex);
690 static int lov_io_prepare_write(const struct lu_env *env,
691 const struct cl_io_slice *ios,
692 const struct cl_page_slice *slice,
693 unsigned from, unsigned to)
695 struct lov_io *lio = cl2lov_io(env, ios);
696 struct cl_page *sub_page = lov_sub_page(slice);
697 struct lov_io_sub *sub;
701 sub = lov_page_subio(env, lio, slice);
703 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
707 result = PTR_ERR(sub);
711 static int lov_io_commit_write(const struct lu_env *env,
712 const struct cl_io_slice *ios,
713 const struct cl_page_slice *slice,
714 unsigned from, unsigned to)
716 struct lov_io *lio = cl2lov_io(env, ios);
717 struct cl_page *sub_page = lov_sub_page(slice);
718 struct lov_io_sub *sub;
722 sub = lov_page_subio(env, lio, slice);
724 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
728 result = PTR_ERR(sub);
732 static int lov_io_fault_start(const struct lu_env *env,
733 const struct cl_io_slice *ios)
735 struct cl_fault_io *fio;
737 struct lov_io_sub *sub;
740 fio = &ios->cis_io->u.ci_fault;
741 lio = cl2lov_io(env, ios);
742 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
743 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
745 RETURN(lov_io_start(env, ios));
748 static void lov_io_fsync_end(const struct lu_env *env,
749 const struct cl_io_slice *ios)
751 struct lov_io *lio = cl2lov_io(env, ios);
752 struct lov_io_sub *sub;
753 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
757 cfs_list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
758 struct cl_io *subio = sub->sub_io;
761 lov_io_end_wrapper(sub->sub_env, subio);
764 if (subio->ci_result == 0)
765 *written += subio->u.ci_fsync.fi_nr_written;
770 static const struct cl_io_operations lov_io_ops = {
773 .cio_fini = lov_io_fini,
774 .cio_iter_init = lov_io_rw_iter_init,
775 .cio_iter_fini = lov_io_iter_fini,
776 .cio_lock = lov_io_lock,
777 .cio_unlock = lov_io_unlock,
778 .cio_start = lov_io_start,
779 .cio_end = lov_io_end
782 .cio_fini = lov_io_fini,
783 .cio_iter_init = lov_io_rw_iter_init,
784 .cio_iter_fini = lov_io_iter_fini,
785 .cio_lock = lov_io_lock,
786 .cio_unlock = lov_io_unlock,
787 .cio_start = lov_io_start,
788 .cio_end = lov_io_end
791 .cio_fini = lov_io_fini,
792 .cio_iter_init = lov_io_iter_init,
793 .cio_iter_fini = lov_io_iter_fini,
794 .cio_lock = lov_io_lock,
795 .cio_unlock = lov_io_unlock,
796 .cio_start = lov_io_start,
797 .cio_end = lov_io_end
800 .cio_fini = lov_io_fini,
801 .cio_iter_init = lov_io_iter_init,
802 .cio_iter_fini = lov_io_iter_fini,
803 .cio_lock = lov_io_lock,
804 .cio_unlock = lov_io_unlock,
805 .cio_start = lov_io_fault_start,
806 .cio_end = lov_io_end
809 .cio_fini = lov_io_fini,
810 .cio_iter_init = lov_io_iter_init,
811 .cio_iter_fini = lov_io_iter_fini,
812 .cio_lock = lov_io_lock,
813 .cio_unlock = lov_io_unlock,
814 .cio_start = lov_io_start,
815 .cio_end = lov_io_fsync_end
818 .cio_fini = lov_io_fini
823 .cio_submit = lov_io_submit
826 .cio_submit = lov_io_submit
829 .cio_prepare_write = lov_io_prepare_write,
830 .cio_commit_write = lov_io_commit_write
833 /*****************************************************************************
835 * Empty lov io operations.
839 static void lov_empty_io_fini(const struct lu_env *env,
840 const struct cl_io_slice *ios)
846 static void lov_empty_impossible(const struct lu_env *env,
847 struct cl_io_slice *ios)
852 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
855 * An io operation vector for files without stripes.
857 static const struct cl_io_operations lov_empty_io_ops = {
861 .cio_fini = lov_empty_io_fini,
862 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
863 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
864 .cio_start = LOV_EMPTY_IMPOSSIBLE,
865 .cio_end = LOV_EMPTY_IMPOSSIBLE
869 .cio_fini = lov_empty_io_fini,
870 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
871 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
872 .cio_start = LOV_EMPTY_IMPOSSIBLE,
873 .cio_end = LOV_EMPTY_IMPOSSIBLE
876 .cio_fini = lov_empty_io_fini,
877 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
878 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
879 .cio_start = LOV_EMPTY_IMPOSSIBLE,
880 .cio_end = LOV_EMPTY_IMPOSSIBLE
883 .cio_fini = lov_empty_io_fini,
884 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
885 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
886 .cio_start = LOV_EMPTY_IMPOSSIBLE,
887 .cio_end = LOV_EMPTY_IMPOSSIBLE
890 .cio_fini = lov_empty_io_fini
893 .cio_fini = lov_empty_io_fini
898 .cio_submit = LOV_EMPTY_IMPOSSIBLE
901 .cio_submit = LOV_EMPTY_IMPOSSIBLE
904 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
907 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
910 struct lov_io *lio = lov_env_io(env);
911 struct lov_object *lov = cl2lov(obj);
914 CFS_INIT_LIST_HEAD(&lio->lis_active);
915 lov_io_slice_init(lio, lov, io);
916 if (io->ci_result == 0) {
917 io->ci_result = lov_io_subio_init(env, lio, io);
918 if (io->ci_result == 0)
919 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
921 RETURN(io->ci_result);
924 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
927 struct lov_io *lio = lov_env_io(env);
932 switch (io->ci_type) {
946 CERROR("Page fault on a file without stripes: "DFID"\n",
947 PFID(lu_object_fid(&obj->co_lu)));
951 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
952 io->ci_result = result;