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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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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2013, 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)
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_object->lo_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(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;
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);
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 int lov_page_stripe(const struct cl_page *page)
251 struct lovsub_object *subobj;
252 const struct cl_page_slice *slice;
255 slice = cl_page_at(page, &lovsub_device_type);
256 LASSERT(slice != NULL);
257 LASSERT(slice->cpl_obj != NULL);
259 subobj = cl2lovsub(slice->cpl_obj);
260 RETURN(subobj->lso_index);
263 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
264 const struct cl_page_slice *slice)
266 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
267 struct cl_page *page = slice->cpl_page;
270 LASSERT(lio->lis_cl.cis_io != NULL);
271 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
272 LASSERT(lsm != NULL);
273 LASSERT(lio->lis_nr_subios > 0);
276 stripe = lov_page_stripe(page);
277 RETURN(lov_sub_get(env, lio, stripe));
281 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
284 struct lov_stripe_md *lsm;
288 LASSERT(lio->lis_object != NULL);
289 lsm = lio->lis_object->lo_lsm;
292 * Need to be optimized, we can't afford to allocate a piece of memory
293 * when writing a page. -jay
295 OBD_ALLOC_LARGE(lio->lis_subs,
296 lsm->lsm_stripe_count * sizeof lio->lis_subs[0]);
297 if (lio->lis_subs != NULL) {
298 lio->lis_nr_subios = lio->lis_stripe_count;
299 lio->lis_single_subio_index = -1;
300 lio->lis_active_subios = 0;
307 static void lov_io_slice_init(struct lov_io *lio,
308 struct lov_object *obj, struct cl_io *io)
313 lio->lis_object = obj;
315 LASSERT(obj->lo_lsm != NULL);
316 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
318 switch (io->ci_type) {
321 lio->lis_pos = io->u.ci_rw.crw_pos;
322 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
323 lio->lis_io_endpos = lio->lis_endpos;
324 if (cl_io_is_append(io)) {
325 LASSERT(io->ci_type == CIT_WRITE);
327 lio->lis_endpos = OBD_OBJECT_EOF;
332 if (cl_io_is_trunc(io))
333 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
336 lio->lis_endpos = OBD_OBJECT_EOF;
340 pgoff_t index = io->u.ci_fault.ft_index;
341 lio->lis_pos = cl_offset(io->ci_obj, index);
342 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
347 lio->lis_pos = io->u.ci_fsync.fi_start;
348 lio->lis_endpos = io->u.ci_fsync.fi_end;
354 lio->lis_endpos = OBD_OBJECT_EOF;
364 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
366 struct lov_io *lio = cl2lov_io(env, ios);
367 struct lov_object *lov = cl2lov(ios->cis_obj);
371 if (lio->lis_subs != NULL) {
372 for (i = 0; i < lio->lis_nr_subios; i++)
373 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
374 OBD_FREE_LARGE(lio->lis_subs,
375 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
376 lio->lis_nr_subios = 0;
379 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
380 if (atomic_dec_and_test(&lov->lo_active_ios))
381 wake_up_all(&lov->lo_waitq);
385 static obd_off lov_offset_mod(obd_off val, int delta)
387 if (val != OBD_OBJECT_EOF)
392 static int lov_io_iter_init(const struct lu_env *env,
393 const struct cl_io_slice *ios)
395 struct lov_io *lio = cl2lov_io(env, ios);
396 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
397 struct lov_io_sub *sub;
405 endpos = lov_offset_mod(lio->lis_endpos, -1);
406 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
407 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
408 endpos, &start, &end))
411 end = lov_offset_mod(end, +1);
412 sub = lov_sub_get(env, lio, stripe);
414 lov_io_sub_inherit(sub->sub_io, lio, stripe,
416 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
418 CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
424 cfs_list_add_tail(&sub->sub_linkage, &lio->lis_active);
431 static int lov_io_rw_iter_init(const struct lu_env *env,
432 const struct cl_io_slice *ios)
434 struct lov_io *lio = cl2lov_io(env, ios);
435 struct cl_io *io = ios->cis_io;
436 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
437 loff_t start = io->u.ci_rw.crw_pos;
439 unsigned long ssize = lsm->lsm_stripe_size;
441 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
444 /* fast path for common case. */
445 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
447 lov_do_div64(start, ssize);
448 next = (start + 1) * ssize;
449 if (next <= start * ssize)
452 io->ci_continue = next < lio->lis_io_endpos;
453 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
454 next) - io->u.ci_rw.crw_pos;
455 lio->lis_pos = io->u.ci_rw.crw_pos;
456 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
457 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
458 LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
459 (__u64)lio->lis_io_endpos);
462 * XXX The following call should be optimized: we know, that
463 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
465 RETURN(lov_io_iter_init(env, ios));
468 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
469 int (*iofunc)(const struct lu_env *, struct cl_io *))
471 struct cl_io *parent = lio->lis_cl.cis_io;
472 struct lov_io_sub *sub;
476 cfs_list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
478 rc = iofunc(sub->sub_env, sub->sub_io);
483 if (parent->ci_result == 0)
484 parent->ci_result = sub->sub_io->ci_result;
489 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
492 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
495 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
498 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
501 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
505 * It's possible that lov_io_start() wasn't called against this
506 * sub-io, either because previous sub-io failed, or upper layer
509 if (io->ci_state == CIS_IO_GOING)
512 io->ci_state = CIS_IO_FINISHED;
516 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
518 cl_io_iter_fini(env, io);
522 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
524 cl_io_unlock(env, io);
528 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
532 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
536 static void lov_io_iter_fini(const struct lu_env *env,
537 const struct cl_io_slice *ios)
539 struct lov_io *lio = cl2lov_io(env, ios);
543 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
545 while (!cfs_list_empty(&lio->lis_active))
546 cfs_list_del_init(lio->lis_active.next);
550 static void lov_io_unlock(const struct lu_env *env,
551 const struct cl_io_slice *ios)
556 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
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 cl_page_list *qin = &queue->c2_qin;
581 struct lov_io *lio = cl2lov_io(env, ios);
582 struct lov_io_sub *sub;
583 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
584 struct cl_page *page;
589 if (lio->lis_active_subios == 1) {
590 int idx = lio->lis_single_subio_index;
592 LASSERT(idx < lio->lis_nr_subios);
593 sub = lov_sub_get(env, lio, idx);
594 LASSERT(!IS_ERR(sub));
595 LASSERT(sub->sub_io == &lio->lis_single_subio);
596 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
602 LASSERT(lio->lis_subs != NULL);
604 cl_page_list_init(plist);
605 while (qin->pl_nr > 0) {
606 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
608 cl_2queue_init(cl2q);
610 page = cl_page_list_first(qin);
611 cl_page_list_move(&cl2q->c2_qin, qin, page);
613 stripe = lov_page_stripe(page);
614 while (qin->pl_nr > 0) {
615 page = cl_page_list_first(qin);
616 if (stripe != lov_page_stripe(page))
619 cl_page_list_move(&cl2q->c2_qin, qin, page);
622 sub = lov_sub_get(env, lio, stripe);
624 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
631 cl_page_list_splice(&cl2q->c2_qin, plist);
632 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
633 cl_2queue_fini(env, cl2q);
639 cl_page_list_splice(plist, qin);
640 cl_page_list_fini(env, plist);
645 static int lov_io_commit_async(const struct lu_env *env,
646 const struct cl_io_slice *ios,
647 struct cl_page_list *queue, int from, int to,
650 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
651 struct lov_io *lio = cl2lov_io(env, ios);
652 struct lov_io_sub *sub;
653 struct cl_page *page;
657 if (lio->lis_active_subios == 1) {
658 int idx = lio->lis_single_subio_index;
660 LASSERT(idx < lio->lis_nr_subios);
661 sub = lov_sub_get(env, lio, idx);
662 LASSERT(!IS_ERR(sub));
663 LASSERT(sub->sub_io == &lio->lis_single_subio);
664 rc = cl_io_commit_async(sub->sub_env, sub->sub_io, queue,
670 LASSERT(lio->lis_subs != NULL);
672 cl_page_list_init(plist);
673 while (queue->pl_nr > 0) {
677 LASSERT(plist->pl_nr == 0);
678 page = cl_page_list_first(queue);
679 cl_page_list_move(plist, queue, page);
681 stripe = lov_page_stripe(page);
682 while (queue->pl_nr > 0) {
683 page = cl_page_list_first(queue);
684 if (stripe != lov_page_stripe(page))
687 cl_page_list_move(plist, queue, page);
690 if (queue->pl_nr > 0) /* still has more pages */
691 stripe_to = PAGE_SIZE;
693 sub = lov_sub_get(env, lio, stripe);
695 rc = cl_io_commit_async(sub->sub_env, sub->sub_io,
696 plist, from, stripe_to, cb);
703 if (plist->pl_nr > 0) /* short write */
709 /* for error case, add the page back into the qin list */
710 LASSERT(ergo(rc == 0, plist->pl_nr == 0));
711 while (plist->pl_nr > 0) {
712 /* error occurred, add the uncommitted pages back into queue */
713 page = cl_page_list_last(plist);
714 cl_page_list_move_head(queue, plist, page);
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;
728 fio = &ios->cis_io->u.ci_fault;
729 lio = cl2lov_io(env, ios);
730 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
731 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
733 RETURN(lov_io_start(env, ios));
736 static void lov_io_fsync_end(const struct lu_env *env,
737 const struct cl_io_slice *ios)
739 struct lov_io *lio = cl2lov_io(env, ios);
740 struct lov_io_sub *sub;
741 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
745 cfs_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;
758 static const struct cl_io_operations lov_io_ops = {
761 .cio_fini = lov_io_fini,
762 .cio_iter_init = lov_io_rw_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_rw_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_start,
776 .cio_end = lov_io_end
779 .cio_fini = lov_io_fini,
780 .cio_iter_init = lov_io_iter_init,
781 .cio_iter_fini = lov_io_iter_fini,
782 .cio_lock = lov_io_lock,
783 .cio_unlock = lov_io_unlock,
784 .cio_start = lov_io_start,
785 .cio_end = lov_io_end
788 .cio_fini = lov_io_fini,
789 .cio_iter_init = lov_io_iter_init,
790 .cio_iter_fini = lov_io_iter_fini,
791 .cio_lock = lov_io_lock,
792 .cio_unlock = lov_io_unlock,
793 .cio_start = lov_io_fault_start,
794 .cio_end = lov_io_end
797 .cio_fini = lov_io_fini,
798 .cio_iter_init = lov_io_iter_init,
799 .cio_iter_fini = lov_io_iter_fini,
800 .cio_lock = lov_io_lock,
801 .cio_unlock = lov_io_unlock,
802 .cio_start = lov_io_start,
803 .cio_end = lov_io_fsync_end
806 .cio_fini = lov_io_fini
809 .cio_submit = lov_io_submit,
810 .cio_commit_async = lov_io_commit_async,
813 /*****************************************************************************
815 * Empty lov io operations.
819 static void lov_empty_io_fini(const struct lu_env *env,
820 const struct cl_io_slice *ios)
822 struct lov_object *lov = cl2lov(ios->cis_obj);
825 if (atomic_dec_and_test(&lov->lo_active_ios))
826 wake_up_all(&lov->lo_waitq);
830 static void lov_empty_impossible(const struct lu_env *env,
831 struct cl_io_slice *ios)
836 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
839 * An io operation vector for files without stripes.
841 static const struct cl_io_operations lov_empty_io_ops = {
844 .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
853 .cio_fini = lov_empty_io_fini,
854 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
855 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
856 .cio_start = LOV_EMPTY_IMPOSSIBLE,
857 .cio_end = LOV_EMPTY_IMPOSSIBLE
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
867 .cio_fini = lov_empty_io_fini,
868 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
869 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
870 .cio_start = LOV_EMPTY_IMPOSSIBLE,
871 .cio_end = LOV_EMPTY_IMPOSSIBLE
874 .cio_fini = lov_empty_io_fini
877 .cio_fini = lov_empty_io_fini
880 .cio_submit = LOV_EMPTY_IMPOSSIBLE,
881 .cio_commit_async = LOV_EMPTY_IMPOSSIBLE
884 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
887 struct lov_io *lio = lov_env_io(env);
888 struct lov_object *lov = cl2lov(obj);
891 INIT_LIST_HEAD(&lio->lis_active);
892 lov_io_slice_init(lio, lov, io);
893 if (io->ci_result == 0) {
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);
897 atomic_inc(&lov->lo_active_ios);
900 RETURN(io->ci_result);
903 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
906 struct lov_object *lov = cl2lov(obj);
907 struct lov_io *lio = lov_env_io(env);
911 lio->lis_object = lov;
912 switch (io->ci_type) {
928 CERROR("Page fault on a file without stripes: "DFID"\n",
929 PFID(lu_object_fid(&obj->co_lu)));
933 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
934 atomic_inc(&lov->lo_active_ios);
937 io->ci_result = result < 0 ? result : 0;
941 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
944 struct lov_object *lov = cl2lov(obj);
945 struct lov_io *lio = lov_env_io(env);
949 LASSERT(lov->lo_lsm != NULL);
950 lio->lis_object = lov;
952 switch (io->ci_type) {
954 LASSERTF(0, "invalid type %d\n", io->ci_type);
960 /* the truncate to 0 is managed by MDT:
961 * - in open, for open O_TRUNC
962 * - in setattr, for truncate
964 /* the truncate is for size > 0 so triggers a restore */
965 if (cl_io_is_trunc(io))
966 io->ci_restore_needed = 1;
972 io->ci_restore_needed = 1;
977 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
978 atomic_inc(&lov->lo_active_ios);
981 io->ci_result = result < 0 ? result : 0;