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;
117 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
122 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
123 if (cl_io_is_append(parent)) {
124 io->u.ci_wr.wr_append = 1;
126 io->u.ci_rw.crw_pos = start;
127 io->u.ci_rw.crw_count = end - start;
136 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
137 struct lov_io_sub *sub)
139 struct lov_object *lov = lio->lis_object;
140 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
141 struct cl_io *sub_io;
142 struct cl_object *sub_obj;
143 struct cl_io *io = lio->lis_cl.cis_io;
145 int stripe = sub->sub_stripe;
148 LASSERT(sub->sub_io == NULL);
149 LASSERT(sub->sub_env == NULL);
150 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
154 sub->sub_io_initialized = 0;
155 sub->sub_borrowed = 0;
157 if (lio->lis_mem_frozen) {
158 LASSERT(cfs_mutex_is_locked(&ld->ld_mutex));
159 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
160 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
161 sub->sub_borrowed = 1;
165 /* obtain new environment */
166 cookie = cl_env_reenter();
167 sub->sub_env = cl_env_get(&sub->sub_refcheck);
168 cl_env_reexit(cookie);
169 if (IS_ERR(sub->sub_env))
170 result = PTR_ERR(sub->sub_env);
174 * First sub-io. Use ->lis_single_subio to
175 * avoid dynamic allocation.
177 if (lio->lis_active_subios == 0) {
178 sub->sub_io = &lio->lis_single_subio;
179 lio->lis_single_subio_index = stripe;
181 OBD_ALLOC_PTR(sub->sub_io);
182 if (sub->sub_io == NULL)
189 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
190 sub_io = sub->sub_io;
192 sub_io->ci_obj = sub_obj;
193 sub_io->ci_result = 0;
195 sub_io->ci_parent = io;
196 sub_io->ci_lockreq = io->ci_lockreq;
197 sub_io->ci_type = io->ci_type;
198 sub_io->ci_no_srvlock = io->ci_no_srvlock;
201 result = cl_io_sub_init(sub->sub_env, sub_io,
202 io->ci_type, sub_obj);
205 lio->lis_active_subios++;
206 sub->sub_io_initialized = 1;
211 lov_io_sub_fini(env, lio, sub);
215 struct lov_io_sub *lov_sub_get(const struct lu_env *env,
216 struct lov_io *lio, int stripe)
219 struct lov_io_sub *sub = &lio->lis_subs[stripe];
221 LASSERT(stripe < lio->lis_stripe_count);
224 if (!sub->sub_io_initialized) {
225 sub->sub_stripe = stripe;
226 rc = lov_io_sub_init(env, lio, sub);
236 void lov_sub_put(struct lov_io_sub *sub)
241 /*****************************************************************************
247 static int lov_page_stripe(const struct cl_page *page)
249 struct lovsub_object *subobj;
253 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
254 &lovsub_device_type));
255 LASSERT(subobj != NULL);
256 RETURN(subobj->lso_index);
259 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
260 const struct cl_page_slice *slice)
262 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
263 struct cl_page *page = slice->cpl_page;
266 LASSERT(lio->lis_cl.cis_io != NULL);
267 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
268 LASSERT(lsm != NULL);
269 LASSERT(lio->lis_nr_subios > 0);
272 stripe = lov_page_stripe(page);
273 RETURN(lov_sub_get(env, lio, stripe));
277 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
280 struct lov_object *lov = lio->lis_object;
281 struct lov_stripe_md *lsm = lov_r0(lov)->lo_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)
306 struct lov_stripe_md *lsm = lov_r0(obj)->lo_lsm;
308 LASSERT(lsm != NULL);
312 lio->lis_object = obj;
313 lio->lis_stripe_count = lsm->lsm_stripe_count;
315 switch (io->ci_type) {
318 lio->lis_pos = io->u.ci_rw.crw_pos;
319 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
320 lio->lis_io_endpos = lio->lis_endpos;
321 if (cl_io_is_append(io)) {
322 LASSERT(io->ci_type == CIT_WRITE);
324 lio->lis_endpos = OBD_OBJECT_EOF;
329 if (cl_io_is_trunc(io))
330 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
333 lio->lis_endpos = OBD_OBJECT_EOF;
337 pgoff_t index = io->u.ci_fault.ft_index;
338 lio->lis_pos = cl_offset(io->ci_obj, index);
339 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
344 lio->lis_pos = io->u.ci_fsync.fi_start;
345 lio->lis_endpos = io->u.ci_fsync.fi_end;
351 lio->lis_endpos = OBD_OBJECT_EOF;
361 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
363 struct lov_io *lio = cl2lov_io(env, ios);
367 if (lio->lis_subs != NULL) {
368 for (i = 0; i < lio->lis_nr_subios; i++)
369 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
370 OBD_FREE_LARGE(lio->lis_subs,
371 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
372 lio->lis_nr_subios = 0;
377 static obd_off lov_offset_mod(obd_off val, int delta)
379 if (val != OBD_OBJECT_EOF)
384 static int lov_io_iter_init(const struct lu_env *env,
385 const struct cl_io_slice *ios)
387 struct lov_io *lio = cl2lov_io(env, ios);
388 struct lov_stripe_md *lsm = lov_r0(lio->lis_object)->lo_lsm;
389 struct lov_io_sub *sub;
397 endpos = lov_offset_mod(lio->lis_endpos, -1);
398 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
399 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
400 endpos, &start, &end))
403 end = lov_offset_mod(end, +1);
404 sub = lov_sub_get(env, lio, stripe);
406 lov_io_sub_inherit(sub->sub_io, lio, stripe,
408 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
410 CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
416 cfs_list_add_tail(&sub->sub_linkage, &lio->lis_active);
423 static int lov_io_rw_iter_init(const struct lu_env *env,
424 const struct cl_io_slice *ios)
426 struct lov_io *lio = cl2lov_io(env, ios);
427 struct cl_io *io = ios->cis_io;
428 struct lov_stripe_md *lsm = lov_r0(cl2lov(ios->cis_obj))->lo_lsm;
429 loff_t start = io->u.ci_rw.crw_pos;
431 unsigned long ssize = lsm->lsm_stripe_size;
433 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
436 /* fast path for common case. */
437 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
439 lov_do_div64(start, ssize);
440 next = (start + 1) * ssize;
441 if (next <= start * ssize)
444 io->ci_continue = next < lio->lis_io_endpos;
445 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
446 next) - io->u.ci_rw.crw_pos;
447 lio->lis_pos = io->u.ci_rw.crw_pos;
448 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
449 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
450 LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
451 (__u64)lio->lis_io_endpos);
454 * XXX The following call should be optimized: we know, that
455 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
457 RETURN(lov_io_iter_init(env, ios));
460 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
461 int (*iofunc)(const struct lu_env *, struct cl_io *))
463 struct cl_io *parent = lio->lis_cl.cis_io;
464 struct lov_io_sub *sub;
468 cfs_list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
470 rc = iofunc(sub->sub_env, sub->sub_io);
475 if (parent->ci_result == 0)
476 parent->ci_result = sub->sub_io->ci_result;
481 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)
490 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
493 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
497 * It's possible that lov_io_start() wasn't called against this
498 * sub-io, either because previous sub-io failed, or upper layer
501 if (io->ci_state == CIS_IO_GOING)
504 io->ci_state = CIS_IO_FINISHED;
508 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
510 cl_io_iter_fini(env, io);
514 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
516 cl_io_unlock(env, io);
520 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
524 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
528 static void lov_io_iter_fini(const struct lu_env *env,
529 const struct cl_io_slice *ios)
531 struct lov_io *lio = cl2lov_io(env, ios);
535 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
537 while (!cfs_list_empty(&lio->lis_active))
538 cfs_list_del_init(lio->lis_active.next);
542 static void lov_io_unlock(const struct lu_env *env,
543 const struct cl_io_slice *ios)
548 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
554 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
555 struct cl_page_list *qin,
558 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
562 * lov implementation of cl_operations::cio_submit() method. It takes a list
563 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
564 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
567 * Major complication of this function is a need to handle memory cleansing:
568 * cl_io_submit() is called to write out pages as a part of VM memory
569 * reclamation, and hence it may not fail due to memory shortages (system
570 * dead-locks otherwise). To deal with this, some resources (sub-lists,
571 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
572 * not-memory cleansing context), and in case of memory shortage, these
573 * pre-allocated resources are used by lov_io_submit() under
574 * lov_device::ld_mutex mutex.
576 static int lov_io_submit(const struct lu_env *env,
577 const struct cl_io_slice *ios,
578 enum cl_req_type crt, struct cl_2queue *queue)
580 struct lov_io *lio = cl2lov_io(env, ios);
581 struct lov_object *obj = lio->lis_object;
582 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
583 struct cl_page_list *qin = &queue->c2_qin;
584 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
585 struct cl_page_list *stripes_qin = NULL;
586 struct cl_page *page;
590 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
594 #if defined(__KERNEL__) && defined(__linux__)
595 !(current->flags & PF_MEMALLOC);
600 if (lio->lis_active_subios == 1) {
601 int idx = lio->lis_single_subio_index;
602 struct lov_io_sub *sub;
604 LASSERT(idx < lio->lis_nr_subios);
605 sub = lov_sub_get(env, lio, idx);
606 LASSERT(!IS_ERR(sub));
607 LASSERT(sub->sub_io == &lio->lis_single_subio);
608 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
614 LASSERT(lio->lis_subs != NULL);
616 OBD_ALLOC_LARGE(stripes_qin,
617 sizeof(*stripes_qin) * lio->lis_nr_subios);
618 if (stripes_qin == NULL)
621 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
622 cl_page_list_init(&stripes_qin[stripe]);
625 * If we get here, it means pageout & swap doesn't help.
626 * In order to not make things worse, even don't try to
627 * allocate the memory with __GFP_NOWARN. -jay
629 cfs_mutex_lock(&ld->ld_mutex);
630 lio->lis_mem_frozen = 1;
633 cl_2queue_init(cl2q);
634 cl_page_list_for_each_safe(page, tmp, qin) {
635 stripe = lov_page_stripe(page);
636 cl_page_list_move(QIN(stripe), qin, page);
639 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
640 struct lov_io_sub *sub;
641 struct cl_page_list *sub_qin = QIN(stripe);
643 if (cfs_list_empty(&sub_qin->pl_pages))
646 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
647 sub = lov_sub_get(env, lio, stripe);
649 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
654 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
655 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
660 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
661 struct cl_page_list *sub_qin = QIN(stripe);
663 if (cfs_list_empty(&sub_qin->pl_pages))
666 cl_page_list_splice(sub_qin, qin);
670 OBD_FREE_LARGE(stripes_qin,
671 sizeof(*stripes_qin) * lio->lis_nr_subios);
675 for (i = 0; i < lio->lis_nr_subios; i++) {
676 struct cl_io *cio = lio->lis_subs[i].sub_io;
678 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
679 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
681 lio->lis_mem_frozen = 0;
682 cfs_mutex_unlock(&ld->ld_mutex);
689 static int lov_io_prepare_write(const struct lu_env *env,
690 const struct cl_io_slice *ios,
691 const struct cl_page_slice *slice,
692 unsigned from, unsigned to)
694 struct lov_io *lio = cl2lov_io(env, ios);
695 struct cl_page *sub_page = lov_sub_page(slice);
696 struct lov_io_sub *sub;
700 sub = lov_page_subio(env, lio, slice);
702 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
706 result = PTR_ERR(sub);
710 static int lov_io_commit_write(const struct lu_env *env,
711 const struct cl_io_slice *ios,
712 const struct cl_page_slice *slice,
713 unsigned from, unsigned to)
715 struct lov_io *lio = cl2lov_io(env, ios);
716 struct cl_page *sub_page = lov_sub_page(slice);
717 struct lov_io_sub *sub;
721 sub = lov_page_subio(env, lio, slice);
723 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
727 result = PTR_ERR(sub);
731 static int lov_io_fault_start(const struct lu_env *env,
732 const struct cl_io_slice *ios)
734 struct cl_fault_io *fio;
736 struct lov_io_sub *sub;
739 fio = &ios->cis_io->u.ci_fault;
740 lio = cl2lov_io(env, ios);
741 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
742 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
744 RETURN(lov_io_start(env, ios));
747 static void lov_io_fsync_end(const struct lu_env *env,
748 const struct cl_io_slice *ios)
750 struct lov_io *lio = cl2lov_io(env, ios);
751 struct lov_io_sub *sub;
752 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
756 cfs_list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
757 struct cl_io *subio = sub->sub_io;
760 lov_io_end_wrapper(sub->sub_env, subio);
763 if (subio->ci_result == 0)
764 *written += subio->u.ci_fsync.fi_nr_written;
769 static const struct cl_io_operations lov_io_ops = {
772 .cio_fini = lov_io_fini,
773 .cio_iter_init = lov_io_rw_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_start,
778 .cio_end = lov_io_end
781 .cio_fini = lov_io_fini,
782 .cio_iter_init = lov_io_rw_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_end
790 .cio_fini = lov_io_fini,
791 .cio_iter_init = lov_io_iter_init,
792 .cio_iter_fini = lov_io_iter_fini,
793 .cio_lock = lov_io_lock,
794 .cio_unlock = lov_io_unlock,
795 .cio_start = lov_io_start,
796 .cio_end = lov_io_end
799 .cio_fini = lov_io_fini,
800 .cio_iter_init = lov_io_iter_init,
801 .cio_iter_fini = lov_io_iter_fini,
802 .cio_lock = lov_io_lock,
803 .cio_unlock = lov_io_unlock,
804 .cio_start = lov_io_fault_start,
805 .cio_end = lov_io_end
808 .cio_fini = lov_io_fini,
809 .cio_iter_init = lov_io_iter_init,
810 .cio_iter_fini = lov_io_iter_fini,
811 .cio_lock = lov_io_lock,
812 .cio_unlock = lov_io_unlock,
813 .cio_start = lov_io_start,
814 .cio_end = lov_io_fsync_end
817 .cio_fini = lov_io_fini
822 .cio_submit = lov_io_submit
825 .cio_submit = lov_io_submit
828 .cio_prepare_write = lov_io_prepare_write,
829 .cio_commit_write = lov_io_commit_write
832 /*****************************************************************************
834 * Empty lov io operations.
838 static void lov_empty_io_fini(const struct lu_env *env,
839 const struct cl_io_slice *ios)
845 static void lov_empty_impossible(const struct lu_env *env,
846 struct cl_io_slice *ios)
851 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
854 * An io operation vector for files without stripes.
856 static const struct cl_io_operations lov_empty_io_ops = {
860 .cio_fini = lov_empty_io_fini,
861 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
862 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
863 .cio_start = LOV_EMPTY_IMPOSSIBLE,
864 .cio_end = LOV_EMPTY_IMPOSSIBLE
868 .cio_fini = lov_empty_io_fini,
869 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
870 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
871 .cio_start = LOV_EMPTY_IMPOSSIBLE,
872 .cio_end = LOV_EMPTY_IMPOSSIBLE
875 .cio_fini = lov_empty_io_fini,
876 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
877 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
878 .cio_start = LOV_EMPTY_IMPOSSIBLE,
879 .cio_end = LOV_EMPTY_IMPOSSIBLE
882 .cio_fini = lov_empty_io_fini,
883 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
884 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
885 .cio_start = LOV_EMPTY_IMPOSSIBLE,
886 .cio_end = LOV_EMPTY_IMPOSSIBLE
889 .cio_fini = lov_empty_io_fini
892 .cio_fini = lov_empty_io_fini
897 .cio_submit = LOV_EMPTY_IMPOSSIBLE
900 .cio_submit = LOV_EMPTY_IMPOSSIBLE
903 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
906 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
909 struct lov_io *lio = lov_env_io(env);
910 struct lov_object *lov = cl2lov(obj);
913 CFS_INIT_LIST_HEAD(&lio->lis_active);
914 lov_io_slice_init(lio, lov, io);
915 if (io->ci_result == 0) {
916 LASSERT(lov_r0(lov)->lo_lsm != NULL);
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);
931 switch (io->ci_type) {
945 CERROR("Page fault on a file without stripes: "DFID"\n",
946 PFID(lu_object_fid(&obj->co_lu)));
950 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
951 io->ci_result = result;