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,
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10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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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, 2012, Intel Corporation.
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)
55 static inline void lov_sub_exit(struct lov_io_sub *sub)
60 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
61 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)
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);
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 = lio->lis_object->lo_lsm;
88 struct cl_io *parent = lio->lis_cl.cis_io;
90 switch (io->ci_type) {
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 if (cl_io_is_trunc(io)) {
95 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
97 new_size = lov_size_to_stripe(lsm, new_size, stripe);
98 io->u.ci_setattr.sa_attr.lvb_size = new_size;
103 struct cl_object *obj = parent->ci_obj;
104 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
106 io->u.ci_fault = parent->u.ci_fault;
107 off = lov_size_to_stripe(lsm, off, stripe);
108 io->u.ci_fault.ft_index = cl_index(obj, off);
112 io->u.ci_fsync.fi_start = start;
113 io->u.ci_fsync.fi_end = end;
114 io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
115 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
120 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
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);
150 if (unlikely(lov_r0(lov)->lo_sub[stripe] == NULL))
154 sub->sub_io_initialized = 0;
155 sub->sub_borrowed = 0;
157 if (lio->lis_mem_frozen) {
158 LASSERT(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 sub->sub_io = kzalloc(sizeof(*sub->sub_io),
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;
200 sub_io->ci_noatime = io->ci_noatime;
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);
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;
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 = 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);
271 stripe = lov_page_stripe(page);
272 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_stripe_md *lsm = lio->lis_object->lo_lsm;
281 LASSERT(lio->lis_object != NULL);
284 * Need to be optimized, we can't afford to allocate a piece of memory
285 * when writing a page. -jay
288 libcfs_kvzalloc(lsm->lsm_stripe_count *
289 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)
305 lio->lis_object = obj;
307 LASSERT(obj->lo_lsm != NULL);
308 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
310 switch (io->ci_type) {
313 lio->lis_pos = io->u.ci_rw.crw_pos;
314 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
315 lio->lis_io_endpos = lio->lis_endpos;
316 if (cl_io_is_append(io)) {
317 LASSERT(io->ci_type == CIT_WRITE);
319 lio->lis_endpos = OBD_OBJECT_EOF;
324 if (cl_io_is_trunc(io))
325 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
328 lio->lis_endpos = OBD_OBJECT_EOF;
332 pgoff_t index = io->u.ci_fault.ft_index;
334 lio->lis_pos = cl_offset(io->ci_obj, index);
335 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
340 lio->lis_pos = io->u.ci_fsync.fi_start;
341 lio->lis_endpos = io->u.ci_fsync.fi_end;
347 lio->lis_endpos = OBD_OBJECT_EOF;
355 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
357 struct lov_io *lio = cl2lov_io(env, ios);
358 struct lov_object *lov = cl2lov(ios->cis_obj);
361 if (lio->lis_subs != NULL) {
362 for (i = 0; i < lio->lis_nr_subios; i++)
363 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
364 kvfree(lio->lis_subs);
365 lio->lis_nr_subios = 0;
368 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
369 if (atomic_dec_and_test(&lov->lo_active_ios))
370 wake_up_all(&lov->lo_waitq);
373 static u64 lov_offset_mod(u64 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 = lio->lis_object->lo_lsm;
385 struct lov_io_sub *sub;
392 endpos = lov_offset_mod(lio->lis_endpos, -1);
393 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
394 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
395 endpos, &start, &end))
398 if (unlikely(lov_r0(lio->lis_object)->lo_sub[stripe] == NULL)) {
399 if (ios->cis_io->ci_type == CIT_READ ||
400 ios->cis_io->ci_type == CIT_WRITE ||
401 ios->cis_io->ci_type == CIT_FAULT)
407 end = lov_offset_mod(end, 1);
408 sub = lov_sub_get(env, lio, stripe);
410 lov_io_sub_inherit(sub->sub_io, lio, stripe,
412 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
414 CDEBUG(D_VFSTRACE, "shrink: %d [%llu, %llu)\n",
420 list_add_tail(&sub->sub_linkage, &lio->lis_active);
427 static int lov_io_rw_iter_init(const struct lu_env *env,
428 const struct cl_io_slice *ios)
430 struct lov_io *lio = cl2lov_io(env, ios);
431 struct cl_io *io = ios->cis_io;
432 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
433 __u64 start = io->u.ci_rw.crw_pos;
435 unsigned long ssize = lsm->lsm_stripe_size;
437 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
439 /* fast path for common case. */
440 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
442 lov_do_div64(start, ssize);
443 next = (start + 1) * ssize;
444 if (next <= start * ssize)
447 io->ci_continue = next < lio->lis_io_endpos;
448 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
449 next) - io->u.ci_rw.crw_pos;
450 lio->lis_pos = io->u.ci_rw.crw_pos;
451 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
452 CDEBUG(D_VFSTRACE, "stripe: %llu chunk: [%llu, %llu) %llu\n",
453 (__u64)start, lio->lis_pos, lio->lis_endpos,
454 (__u64)lio->lis_io_endpos);
457 * XXX The following call should be optimized: we know, that
458 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
460 return lov_io_iter_init(env, ios);
463 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
464 int (*iofunc)(const struct lu_env *, struct cl_io *))
466 struct cl_io *parent = lio->lis_cl.cis_io;
467 struct lov_io_sub *sub;
470 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
472 rc = iofunc(sub->sub_env, sub->sub_io);
477 if (parent->ci_result == 0)
478 parent->ci_result = sub->sub_io->ci_result;
483 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)
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)
496 * It's possible that lov_io_start() wasn't called against this
497 * sub-io, either because previous sub-io failed, or upper layer
500 if (io->ci_state == CIS_IO_GOING)
503 io->ci_state = CIS_IO_FINISHED;
507 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
509 cl_io_iter_fini(env, io);
513 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
515 cl_io_unlock(env, io);
519 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
523 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
527 static void lov_io_iter_fini(const struct lu_env *env,
528 const struct cl_io_slice *ios)
530 struct lov_io *lio = cl2lov_io(env, ios);
533 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
535 while (!list_empty(&lio->lis_active))
536 list_del_init(lio->lis_active.next);
539 static void lov_io_unlock(const struct lu_env *env,
540 const struct cl_io_slice *ios)
544 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
548 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
549 struct cl_page_list *qin,
552 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
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 lov_io *lio = cl2lov_io(env, ios);
575 struct lov_object *obj = lio->lis_object;
576 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
577 struct cl_page_list *qin = &queue->c2_qin;
578 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
579 struct cl_page_list *stripes_qin = NULL;
580 struct cl_page *page;
584 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
588 !(current->flags & PF_MEMALLOC);
590 if (lio->lis_active_subios == 1) {
591 int idx = lio->lis_single_subio_index;
592 struct lov_io_sub *sub;
594 LASSERT(idx < lio->lis_nr_subios);
595 sub = lov_sub_get(env, lio, idx);
596 LASSERT(!IS_ERR(sub));
597 LASSERT(sub->sub_io == &lio->lis_single_subio);
598 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
604 LASSERT(lio->lis_subs != NULL);
607 libcfs_kvzalloc(sizeof(*stripes_qin) *
610 if (stripes_qin == NULL)
613 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
614 cl_page_list_init(&stripes_qin[stripe]);
617 * If we get here, it means pageout & swap doesn't help.
618 * In order to not make things worse, even don't try to
619 * allocate the memory with __GFP_NOWARN. -jay
621 mutex_lock(&ld->ld_mutex);
622 lio->lis_mem_frozen = 1;
625 cl_2queue_init(cl2q);
626 cl_page_list_for_each_safe(page, tmp, qin) {
627 stripe = lov_page_stripe(page);
628 cl_page_list_move(QIN(stripe), qin, page);
631 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
632 struct lov_io_sub *sub;
633 struct cl_page_list *sub_qin = QIN(stripe);
635 if (list_empty(&sub_qin->pl_pages))
638 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
639 sub = lov_sub_get(env, lio, stripe);
641 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
646 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
647 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
652 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
653 struct cl_page_list *sub_qin = QIN(stripe);
655 if (list_empty(&sub_qin->pl_pages))
658 cl_page_list_splice(sub_qin, qin);
666 for (i = 0; i < lio->lis_nr_subios; i++) {
667 struct cl_io *cio = lio->lis_subs[i].sub_io;
669 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
670 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
672 lio->lis_mem_frozen = 0;
673 mutex_unlock(&ld->ld_mutex);
680 static int lov_io_prepare_write(const struct lu_env *env,
681 const struct cl_io_slice *ios,
682 const struct cl_page_slice *slice,
683 unsigned from, unsigned to)
685 struct lov_io *lio = cl2lov_io(env, ios);
686 struct cl_page *sub_page = lov_sub_page(slice);
687 struct lov_io_sub *sub;
690 sub = lov_page_subio(env, lio, slice);
692 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
696 result = PTR_ERR(sub);
700 static int lov_io_commit_write(const struct lu_env *env,
701 const struct cl_io_slice *ios,
702 const struct cl_page_slice *slice,
703 unsigned from, unsigned to)
705 struct lov_io *lio = cl2lov_io(env, ios);
706 struct cl_page *sub_page = lov_sub_page(slice);
707 struct lov_io_sub *sub;
710 sub = lov_page_subio(env, lio, slice);
712 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
716 result = PTR_ERR(sub);
720 static int lov_io_fault_start(const struct lu_env *env,
721 const struct cl_io_slice *ios)
723 struct cl_fault_io *fio;
725 struct lov_io_sub *sub;
727 fio = &ios->cis_io->u.ci_fault;
728 lio = cl2lov_io(env, ios);
729 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
732 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
734 return lov_io_start(env, ios);
737 static void lov_io_fsync_end(const struct lu_env *env,
738 const struct cl_io_slice *ios)
740 struct lov_io *lio = cl2lov_io(env, ios);
741 struct lov_io_sub *sub;
742 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
745 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
746 struct cl_io *subio = sub->sub_io;
749 lov_io_end_wrapper(sub->sub_env, subio);
752 if (subio->ci_result == 0)
753 *written += subio->u.ci_fsync.fi_nr_written;
757 static const struct cl_io_operations lov_io_ops = {
760 .cio_fini = lov_io_fini,
761 .cio_iter_init = lov_io_rw_iter_init,
762 .cio_iter_fini = lov_io_iter_fini,
763 .cio_lock = lov_io_lock,
764 .cio_unlock = lov_io_unlock,
765 .cio_start = lov_io_start,
766 .cio_end = lov_io_end
769 .cio_fini = lov_io_fini,
770 .cio_iter_init = lov_io_rw_iter_init,
771 .cio_iter_fini = lov_io_iter_fini,
772 .cio_lock = lov_io_lock,
773 .cio_unlock = lov_io_unlock,
774 .cio_start = lov_io_start,
775 .cio_end = lov_io_end
778 .cio_fini = lov_io_fini,
779 .cio_iter_init = lov_io_iter_init,
780 .cio_iter_fini = lov_io_iter_fini,
781 .cio_lock = lov_io_lock,
782 .cio_unlock = lov_io_unlock,
783 .cio_start = lov_io_start,
784 .cio_end = lov_io_end
787 .cio_fini = lov_io_fini,
788 .cio_iter_init = lov_io_iter_init,
789 .cio_iter_fini = lov_io_iter_fini,
790 .cio_lock = lov_io_lock,
791 .cio_unlock = lov_io_unlock,
792 .cio_start = lov_io_fault_start,
793 .cio_end = lov_io_end
796 .cio_fini = lov_io_fini,
797 .cio_iter_init = lov_io_iter_init,
798 .cio_iter_fini = lov_io_iter_fini,
799 .cio_lock = lov_io_lock,
800 .cio_unlock = lov_io_unlock,
801 .cio_start = lov_io_start,
802 .cio_end = lov_io_fsync_end
805 .cio_fini = lov_io_fini
810 .cio_submit = lov_io_submit
813 .cio_submit = lov_io_submit
816 .cio_prepare_write = lov_io_prepare_write,
817 .cio_commit_write = lov_io_commit_write
820 /*****************************************************************************
822 * Empty lov io operations.
826 static void lov_empty_io_fini(const struct lu_env *env,
827 const struct cl_io_slice *ios)
829 struct lov_object *lov = cl2lov(ios->cis_obj);
831 if (atomic_dec_and_test(&lov->lo_active_ios))
832 wake_up_all(&lov->lo_waitq);
835 static void lov_empty_impossible(const struct lu_env *env,
836 struct cl_io_slice *ios)
841 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
844 * An io operation vector for files without stripes.
846 static const struct cl_io_operations lov_empty_io_ops = {
849 .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
858 .cio_fini = lov_empty_io_fini,
859 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
860 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
861 .cio_start = LOV_EMPTY_IMPOSSIBLE,
862 .cio_end = LOV_EMPTY_IMPOSSIBLE
865 .cio_fini = lov_empty_io_fini,
866 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
867 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
868 .cio_start = LOV_EMPTY_IMPOSSIBLE,
869 .cio_end = LOV_EMPTY_IMPOSSIBLE
872 .cio_fini = lov_empty_io_fini,
873 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
874 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
875 .cio_start = LOV_EMPTY_IMPOSSIBLE,
876 .cio_end = LOV_EMPTY_IMPOSSIBLE
879 .cio_fini = lov_empty_io_fini
882 .cio_fini = lov_empty_io_fini
887 .cio_submit = LOV_EMPTY_IMPOSSIBLE
890 .cio_submit = LOV_EMPTY_IMPOSSIBLE
893 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
896 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
899 struct lov_io *lio = lov_env_io(env);
900 struct lov_object *lov = cl2lov(obj);
902 INIT_LIST_HEAD(&lio->lis_active);
903 lov_io_slice_init(lio, lov, io);
904 if (io->ci_result == 0) {
905 io->ci_result = lov_io_subio_init(env, lio, io);
906 if (io->ci_result == 0) {
907 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
908 atomic_inc(&lov->lo_active_ios);
911 return io->ci_result;
914 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
917 struct lov_object *lov = cl2lov(obj);
918 struct lov_io *lio = lov_env_io(env);
921 lio->lis_object = lov;
922 switch (io->ci_type) {
938 CERROR("Page fault on a file without stripes: "DFID"\n",
939 PFID(lu_object_fid(&obj->co_lu)));
943 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
944 atomic_inc(&lov->lo_active_ios);
947 io->ci_result = result < 0 ? result : 0;
951 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
954 struct lov_object *lov = cl2lov(obj);
955 struct lov_io *lio = lov_env_io(env);
958 LASSERT(lov->lo_lsm != NULL);
959 lio->lis_object = lov;
961 switch (io->ci_type) {
963 LASSERTF(0, "invalid type %d\n", io->ci_type);
969 /* the truncate to 0 is managed by MDT:
970 * - in open, for open O_TRUNC
971 * - in setattr, for truncate
973 /* the truncate is for size > 0 so triggers a restore */
974 if (cl_io_is_trunc(io))
975 io->ci_restore_needed = 1;
981 io->ci_restore_needed = 1;
986 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
987 atomic_inc(&lov->lo_active_ios);
990 io->ci_result = result < 0 ? result : 0;