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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_io for LOV layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_LOV
40 #include "lov_cl_internal.h"
46 static inline struct lov_io_sub *lov_sub_alloc(struct lov_io *lio, int index)
48 struct lov_io_sub *sub;
50 if (lio->lis_nr_subios == 0) {
51 LASSERT(lio->lis_single_subio_index == -1);
52 sub = &lio->lis_single_subio;
53 lio->lis_single_subio_index = index;
54 memset(sub, 0, sizeof(*sub));
60 INIT_LIST_HEAD(&sub->sub_list);
61 INIT_LIST_HEAD(&sub->sub_linkage);
62 sub->sub_subio_index = index;
68 static inline void lov_sub_free(struct lov_io *lio, struct lov_io_sub *sub)
70 if (sub->sub_subio_index == lio->lis_single_subio_index) {
71 LASSERT(sub == &lio->lis_single_subio);
72 lio->lis_single_subio_index = -1;
78 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
79 struct lov_io_sub *sub)
83 cl_io_fini(sub->sub_env, &sub->sub_io);
85 if (sub->sub_env && !IS_ERR(sub->sub_env)) {
86 cl_env_put(sub->sub_env, &sub->sub_refcheck);
93 is_index_within_mirror(struct lov_object *lov, int index, int mirror_index)
95 struct lov_layout_composite *comp = &lov->u.composite;
96 struct lov_mirror_entry *lre = &comp->lo_mirrors[mirror_index];
98 return (index >= lre->lre_start && index <= lre->lre_end);
101 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
102 struct lov_io_sub *sub)
104 struct lov_object *lov = lio->lis_object;
105 struct cl_io *sub_io;
106 struct cl_object *sub_obj;
107 struct cl_io *io = lio->lis_cl.cis_io;
108 int index = lov_comp_entry(sub->sub_subio_index);
109 int stripe = lov_comp_stripe(sub->sub_subio_index);
111 LASSERT(sub->sub_env == NULL);
114 if (unlikely(!lov_r0(lov, index)->lo_sub ||
115 !lov_r0(lov, index)->lo_sub[stripe]))
118 LASSERTF(is_index_within_mirror(lov, index, lio->lis_mirror_index),
119 DFID "iot = %d, index = %d, mirror = %d\n",
120 PFID(lu_object_fid(lov2lu(lov))), io->ci_type, index,
121 lio->lis_mirror_index);
123 /* obtain new environment */
124 sub->sub_env = cl_env_get(&sub->sub_refcheck);
125 if (IS_ERR(sub->sub_env)) {
126 result = PTR_ERR(sub->sub_env);
130 sub_obj = lovsub2cl(lov_r0(lov, index)->lo_sub[stripe]);
131 sub_io = &sub->sub_io;
133 sub_io->ci_obj = sub_obj;
134 sub_io->ci_result = 0;
136 sub_io->ci_parent = io;
137 sub_io->ci_lockreq = io->ci_lockreq;
138 sub_io->ci_type = io->ci_type;
139 sub_io->ci_no_srvlock = io->ci_no_srvlock;
140 sub_io->ci_noatime = io->ci_noatime;
141 sub_io->ci_lock_no_expand = io->ci_lock_no_expand;
142 sub_io->ci_ndelay = io->ci_ndelay;
143 sub_io->ci_layout_version = io->ci_layout_version;
145 result = cl_io_sub_init(sub->sub_env, sub_io, io->ci_type, sub_obj);
148 lov_io_sub_fini(env, lio, sub);
153 struct lov_io_sub *lov_sub_get(const struct lu_env *env,
154 struct lov_io *lio, int index)
156 struct lov_io_sub *sub;
161 list_for_each_entry(sub, &lio->lis_subios, sub_list) {
162 if (sub->sub_subio_index == index) {
169 sub = lov_sub_alloc(lio, index);
171 GOTO(out, rc = -ENOMEM);
173 rc = lov_io_sub_init(env, lio, sub);
175 lov_sub_free(lio, sub);
179 list_add_tail(&sub->sub_list, &lio->lis_subios);
180 lio->lis_nr_subios++;
188 /*****************************************************************************
194 int lov_page_index(const struct cl_page *page)
196 const struct cl_page_slice *slice;
199 slice = cl_page_at(page, &lov_device_type);
200 LASSERT(slice != NULL);
201 LASSERT(slice->cpl_obj != NULL);
203 RETURN(cl2lov_page(slice)->lps_index);
206 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
211 LASSERT(lio->lis_object != NULL);
213 INIT_LIST_HEAD(&lio->lis_subios);
214 lio->lis_single_subio_index = -1;
215 lio->lis_nr_subios = 0;
221 * Decide if it will need write intent RPC
223 static int lov_io_mirror_write_intent(struct lov_io *lio,
224 struct lov_object *obj, struct cl_io *io)
226 struct lov_layout_composite *comp = &obj->u.composite;
227 struct lu_extent *ext = &io->ci_write_intent;
228 struct lov_mirror_entry *lre;
229 struct lov_mirror_entry *primary;
230 struct lov_layout_entry *lle;
234 *ext = (typeof(*ext)) { lio->lis_pos, lio->lis_endpos };
235 io->ci_need_write_intent = 0;
237 if (!(io->ci_type == CIT_WRITE || cl_io_is_trunc(io) ||
238 cl_io_is_mkwrite(io)))
242 * FLR: check if it needs to send a write intent RPC to server.
243 * Writing to sync_pending file needs write intent RPC to change
244 * the file state back to write_pending, so that the layout version
245 * can be increased when the state changes to sync_pending at a later
246 * time. Otherwise there exists a chance that an evicted client may
247 * dirty the file data while resync client is working on it.
248 * Designated I/O is allowed for resync workload.
250 if (lov_flr_state(obj) == LCM_FL_RDONLY ||
251 (lov_flr_state(obj) == LCM_FL_SYNC_PENDING &&
252 io->ci_designated_mirror == 0)) {
253 io->ci_need_write_intent = 1;
257 LASSERT((lov_flr_state(obj) == LCM_FL_WRITE_PENDING));
258 LASSERT(comp->lo_preferred_mirror >= 0);
261 * need to iterate all components to see if there are
262 * multiple components covering the writing component
264 primary = &comp->lo_mirrors[comp->lo_preferred_mirror];
265 LASSERT(!primary->lre_stale);
266 lov_foreach_mirror_layout_entry(obj, lle, primary) {
267 LASSERT(lle->lle_valid);
268 if (!lu_extent_is_overlapped(ext, lle->lle_extent))
271 ext->e_start = MIN(ext->e_start, lle->lle_extent->e_start);
272 ext->e_end = MAX(ext->e_end, lle->lle_extent->e_end);
276 CERROR(DFID ": cannot find any valid components covering "
277 "file extent "DEXT", mirror: %d\n",
278 PFID(lu_object_fid(lov2lu(obj))), PEXT(ext),
279 primary->lre_mirror_id);
284 lov_foreach_mirror_entry(obj, lre) {
288 lov_foreach_mirror_layout_entry(obj, lle, lre) {
292 if (lu_extent_is_overlapped(ext, lle->lle_extent)) {
299 CDEBUG(D_VFSTRACE, DFID "there are %zd components to be staled to "
300 "modify file extent "DEXT", iot: %d\n",
301 PFID(lu_object_fid(lov2lu(obj))), count, PEXT(ext), io->ci_type);
303 io->ci_need_write_intent = count > 0;
308 static int lov_io_mirror_init(struct lov_io *lio, struct lov_object *obj,
311 struct lov_layout_composite *comp = &obj->u.composite;
317 if (!lov_is_flr(obj)) {
318 LASSERT(comp->lo_preferred_mirror == 0);
319 lio->lis_mirror_index = comp->lo_preferred_mirror;
324 /* transfer the layout version for verification */
325 if (io->ci_layout_version == 0)
326 io->ci_layout_version = obj->lo_lsm->lsm_layout_gen;
328 /* find the corresponding mirror for designated mirror IO */
329 if (io->ci_designated_mirror > 0) {
330 struct lov_mirror_entry *entry;
332 LASSERT(!io->ci_ndelay);
334 CDEBUG(D_LAYOUT, "designated I/O mirror state: %d\n",
337 if ((cl_io_is_trunc(io) || io->ci_type == CIT_WRITE) &&
338 (io->ci_layout_version != obj->lo_lsm->lsm_layout_gen)) {
340 * For resync I/O, the ci_layout_version was the layout
341 * version when resync starts. If it doesn't match the
342 * current object layout version, it means the layout
348 io->ci_layout_version |= LU_LAYOUT_RESYNC;
351 lio->lis_mirror_index = -1;
352 lov_foreach_mirror_entry(obj, entry) {
353 if (entry->lre_mirror_id ==
354 io->ci_designated_mirror) {
355 lio->lis_mirror_index = index;
362 RETURN(lio->lis_mirror_index < 0 ? -EINVAL : 0);
365 result = lov_io_mirror_write_intent(lio, obj, io);
369 if (io->ci_need_write_intent) {
370 CDEBUG(D_VFSTRACE, DFID " need write intent for [%llu, %llu)\n",
371 PFID(lu_object_fid(lov2lu(obj))),
372 lio->lis_pos, lio->lis_endpos);
374 if (cl_io_is_trunc(io)) {
376 * for truncate, we uses [size, EOF) to judge whether
377 * a write intent needs to be send, but we need to
378 * restore the write extent to [0, size).
380 io->ci_write_intent.e_start = 0;
381 io->ci_write_intent.e_end =
382 io->u.ci_setattr.sa_attr.lvb_size;
384 /* stop cl_io_init() loop */
388 if (io->ci_ndelay_tried == 0 || /* first time to try */
389 /* reset the mirror index if layout has changed */
390 lio->lis_mirror_layout_gen != obj->lo_lsm->lsm_layout_gen) {
391 lio->lis_mirror_layout_gen = obj->lo_lsm->lsm_layout_gen;
392 index = lio->lis_mirror_index = comp->lo_preferred_mirror;
394 index = lio->lis_mirror_index;
397 /* move mirror index to the next one */
398 index = (index + 1) % comp->lo_mirror_count;
401 for (i = 0; i < comp->lo_mirror_count; i++) {
402 struct lu_extent ext = { .e_start = lio->lis_pos,
403 .e_end = lio->lis_pos + 1 };
404 struct lov_mirror_entry *lre;
405 struct lov_layout_entry *lle;
408 lre = &comp->lo_mirrors[(index + i) % comp->lo_mirror_count];
412 lov_foreach_mirror_layout_entry(obj, lle, lre) {
416 if (lu_extent_is_overlapped(&ext, lle->lle_extent)) {
423 index = (index + i) % comp->lo_mirror_count;
427 if (i == comp->lo_mirror_count) {
428 CERROR(DFID": failed to find a component covering "
429 "I/O region at %llu\n",
430 PFID(lu_object_fid(lov2lu(obj))), lio->lis_pos);
432 dump_lsm(D_ERROR, obj->lo_lsm);
437 CDEBUG(D_VFSTRACE, DFID ": flr state: %d, move mirror from %d to %d, "
438 "have retried: %d, mirror count: %d\n",
439 PFID(lu_object_fid(lov2lu(obj))), lov_flr_state(obj),
440 lio->lis_mirror_index, index, io->ci_ndelay_tried,
441 comp->lo_mirror_count);
443 lio->lis_mirror_index = index;
446 * FLR: if all mirrors have been tried once, most likely the network
447 * of this client has been partitioned. We should relinquish CPU for
448 * a while before trying again.
450 ++io->ci_ndelay_tried;
451 if (io->ci_ndelay && io->ci_ndelay_tried >= comp->lo_mirror_count) {
452 set_current_state(TASK_INTERRUPTIBLE);
453 schedule_timeout(msecs_to_jiffies(MSEC_PER_SEC)); /* 10ms */
454 if (signal_pending(current))
457 /* reset retry counter */
458 io->ci_ndelay_tried = 1;
461 CDEBUG(D_VFSTRACE, "use %sdelayed RPC state for this IO\n",
462 io->ci_ndelay ? "non-" : "");
467 static int lov_io_slice_init(struct lov_io *lio,
468 struct lov_object *obj, struct cl_io *io)
475 lio->lis_object = obj;
477 LASSERT(obj->lo_lsm != NULL);
479 switch (io->ci_type) {
482 lio->lis_pos = io->u.ci_rw.crw_pos;
483 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
484 lio->lis_io_endpos = lio->lis_endpos;
485 if (cl_io_is_append(io)) {
486 LASSERT(io->ci_type == CIT_WRITE);
489 * If there is LOV EA hole, then we may cannot locate
490 * the current file-tail exactly.
492 if (unlikely(obj->lo_lsm->lsm_entries[0]->lsme_pattern &
494 GOTO(out, result = -EIO);
497 lio->lis_endpos = OBD_OBJECT_EOF;
502 if (cl_io_is_trunc(io))
503 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
506 lio->lis_endpos = OBD_OBJECT_EOF;
509 case CIT_DATA_VERSION:
511 lio->lis_endpos = OBD_OBJECT_EOF;
515 pgoff_t index = io->u.ci_fault.ft_index;
517 lio->lis_pos = cl_offset(io->ci_obj, index);
518 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
523 lio->lis_pos = io->u.ci_fsync.fi_start;
524 lio->lis_endpos = io->u.ci_fsync.fi_end;
529 lio->lis_pos = io->u.ci_ladvise.li_start;
530 lio->lis_endpos = io->u.ci_ladvise.li_end;
536 lio->lis_endpos = OBD_OBJECT_EOF;
538 if (lov_flr_state(obj) == LCM_FL_RDONLY &&
539 !OBD_FAIL_CHECK(OBD_FAIL_FLR_GLIMPSE_IMMUTABLE))
540 /* SoM is accurate, no need glimpse */
541 GOTO(out, result = 1);
546 lio->lis_endpos = OBD_OBJECT_EOF;
553 result = lov_io_mirror_init(lio, obj, io);
557 /* check if it needs to instantiate layout */
558 if (!(io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io) ||
559 (cl_io_is_trunc(io) && io->u.ci_setattr.sa_attr.lvb_size > 0)))
560 GOTO(out, result = 0);
563 * for truncate, it only needs to instantiate the components
564 * before the truncated size.
566 if (cl_io_is_trunc(io)) {
567 io->ci_write_intent.e_start = 0;
568 io->ci_write_intent.e_end = io->u.ci_setattr.sa_attr.lvb_size;
570 io->ci_write_intent.e_start = lio->lis_pos;
571 io->ci_write_intent.e_end = lio->lis_endpos;
575 lov_foreach_io_layout(index, lio, &io->ci_write_intent) {
576 if (!lsm_entry_inited(obj->lo_lsm, index)) {
577 io->ci_need_write_intent = 1;
582 if (io->ci_need_write_intent && io->ci_designated_mirror > 0) {
584 * REINT_SYNC RPC has already tried to instantiate all of the
585 * components involved, obviously it didn't succeed. Skip this
586 * mirror for now. The server won't be able to figure out
587 * which mirror it should instantiate components
589 CERROR(DFID": trying to instantiate components for designated "
590 "I/O, file state: %d\n",
591 PFID(lu_object_fid(lov2lu(obj))), lov_flr_state(obj));
593 io->ci_need_write_intent = 0;
594 GOTO(out, result = -EIO);
597 if (io->ci_need_write_intent)
598 GOTO(out, result = 1);
606 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
608 struct lov_io *lio = cl2lov_io(env, ios);
609 struct lov_object *lov = cl2lov(ios->cis_obj);
613 LASSERT(list_empty(&lio->lis_active));
615 while (!list_empty(&lio->lis_subios)) {
616 struct lov_io_sub *sub = list_entry(lio->lis_subios.next,
620 list_del_init(&sub->sub_list);
621 lio->lis_nr_subios--;
623 lov_io_sub_fini(env, lio, sub);
624 lov_sub_free(lio, sub);
626 LASSERT(lio->lis_nr_subios == 0);
628 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
629 if (atomic_dec_and_test(&lov->lo_active_ios))
630 wake_up_all(&lov->lo_waitq);
634 static void lov_io_sub_inherit(struct lov_io_sub *sub, struct lov_io *lio,
635 loff_t start, loff_t end)
637 struct cl_io *io = &sub->sub_io;
638 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
639 struct cl_io *parent = lio->lis_cl.cis_io;
640 int index = lov_comp_entry(sub->sub_subio_index);
641 int stripe = lov_comp_stripe(sub->sub_subio_index);
643 switch (io->ci_type) {
645 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
646 io->u.ci_setattr.sa_attr_flags =
647 parent->u.ci_setattr.sa_attr_flags;
648 io->u.ci_setattr.sa_avalid = parent->u.ci_setattr.sa_avalid;
649 io->u.ci_setattr.sa_xvalid = parent->u.ci_setattr.sa_xvalid;
650 io->u.ci_setattr.sa_stripe_index = stripe;
651 io->u.ci_setattr.sa_parent_fid =
652 parent->u.ci_setattr.sa_parent_fid;
653 if (cl_io_is_trunc(io)) {
654 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
656 new_size = lov_size_to_stripe(lsm, index, new_size,
658 io->u.ci_setattr.sa_attr.lvb_size = new_size;
660 lov_lsm2layout(lsm, lsm->lsm_entries[index],
661 &io->u.ci_setattr.sa_layout);
664 case CIT_DATA_VERSION: {
665 io->u.ci_data_version.dv_data_version = 0;
666 io->u.ci_data_version.dv_flags =
667 parent->u.ci_data_version.dv_flags;
671 struct cl_object *obj = parent->ci_obj;
672 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
674 io->u.ci_fault = parent->u.ci_fault;
675 off = lov_size_to_stripe(lsm, index, off, stripe);
676 io->u.ci_fault.ft_index = cl_index(obj, off);
680 io->u.ci_fsync.fi_start = start;
681 io->u.ci_fsync.fi_end = end;
682 io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
683 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
688 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
689 if (cl_io_is_append(parent)) {
690 io->u.ci_wr.wr_append = 1;
692 io->u.ci_rw.crw_pos = start;
693 io->u.ci_rw.crw_count = end - start;
698 io->u.ci_ladvise.li_start = start;
699 io->u.ci_ladvise.li_end = end;
700 io->u.ci_ladvise.li_fid = parent->u.ci_ladvise.li_fid;
701 io->u.ci_ladvise.li_advice = parent->u.ci_ladvise.li_advice;
702 io->u.ci_ladvise.li_flags = parent->u.ci_ladvise.li_flags;
712 static loff_t lov_offset_mod(loff_t val, int delta)
714 if (val != OBD_OBJECT_EOF)
719 static int lov_io_iter_init(const struct lu_env *env,
720 const struct cl_io_slice *ios)
722 struct lov_io *lio = cl2lov_io(env, ios);
723 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
724 struct lov_io_sub *sub;
725 struct lu_extent ext;
731 ext.e_start = lio->lis_pos;
732 ext.e_end = lio->lis_endpos;
734 lov_foreach_io_layout(index, lio, &ext) {
735 struct lov_layout_entry *le = lov_entry(lio->lis_object, index);
736 struct lov_layout_raid0 *r0 = &le->lle_raid0;
741 CDEBUG(D_VFSTRACE, "component[%d] flags %#x\n",
742 index, lsm->lsm_entries[index]->lsme_flags);
743 if (!lsm_entry_inited(lsm, index)) {
745 * Read from uninitialized components should return
751 if (!le->lle_valid && !ios->cis_io->ci_designated_mirror) {
752 CERROR("I/O to invalid component: %d, mirror: %d\n",
753 index, lio->lis_mirror_index);
757 for (stripe = 0; stripe < r0->lo_nr; stripe++) {
758 if (!lov_stripe_intersects(lsm, index, stripe,
762 if (unlikely(!r0->lo_sub[stripe])) {
763 if (ios->cis_io->ci_type == CIT_READ ||
764 ios->cis_io->ci_type == CIT_WRITE ||
765 ios->cis_io->ci_type == CIT_FAULT)
771 end = lov_offset_mod(end, 1);
772 sub = lov_sub_get(env, lio,
773 lov_comp_index(index, stripe));
779 lov_io_sub_inherit(sub, lio, start, end);
780 rc = cl_io_iter_init(sub->sub_env, &sub->sub_io);
782 cl_io_iter_fini(sub->sub_env, &sub->sub_io);
786 CDEBUG(D_VFSTRACE, "shrink: %d [%llu, %llu)\n",
789 list_add_tail(&sub->sub_linkage, &lio->lis_active);
797 static int lov_io_rw_iter_init(const struct lu_env *env,
798 const struct cl_io_slice *ios)
800 struct lov_io *lio = cl2lov_io(env, ios);
801 struct cl_io *io = ios->cis_io;
802 struct lov_stripe_md_entry *lse;
803 loff_t start = io->u.ci_rw.crw_pos;
807 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
810 if (cl_io_is_append(io))
811 RETURN(lov_io_iter_init(env, ios));
813 index = lov_io_layout_at(lio, io->u.ci_rw.crw_pos);
814 if (index < 0) { /* non-existing layout component */
815 if (io->ci_type == CIT_READ) {
817 * TODO: it needs to detect the next component and
818 * then set the next pos
822 RETURN(lov_io_iter_init(env, ios));
828 if (!lov_entry(lio->lis_object, index)->lle_valid &&
829 !io->ci_designated_mirror)
830 RETURN(io->ci_type == CIT_READ ? -EAGAIN : -EIO);
832 lse = lov_lse(lio->lis_object, index);
834 next = MAX_LFS_FILESIZE;
835 if (lse->lsme_stripe_count > 1) {
836 unsigned long ssize = lse->lsme_stripe_size;
838 lov_do_div64(start, ssize);
839 next = (start + 1) * ssize;
840 if (next <= start * ssize)
841 next = MAX_LFS_FILESIZE;
844 LASSERTF(io->u.ci_rw.crw_pos >= lse->lsme_extent.e_start,
845 "pos %lld, [%lld, %lld)\n", io->u.ci_rw.crw_pos,
846 lse->lsme_extent.e_start, lse->lsme_extent.e_end);
847 next = min_t(__u64, next, lse->lsme_extent.e_end);
848 next = min_t(loff_t, next, lio->lis_io_endpos);
850 io->ci_continue = next < lio->lis_io_endpos;
851 io->u.ci_rw.crw_count = next - io->u.ci_rw.crw_pos;
852 lio->lis_pos = io->u.ci_rw.crw_pos;
853 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
855 "stripe: %llu chunk: [%llu, %llu) %llu, %zd\n",
856 (__u64)start, lio->lis_pos, lio->lis_endpos,
857 (__u64)lio->lis_io_endpos, io->u.ci_rw.crw_count);
860 * XXX The following call should be optimized: we know, that
861 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
863 RETURN(lov_io_iter_init(env, ios));
866 static int lov_io_setattr_iter_init(const struct lu_env *env,
867 const struct cl_io_slice *ios)
869 struct lov_io *lio = cl2lov_io(env, ios);
870 struct cl_io *io = ios->cis_io;
874 if (cl_io_is_trunc(io) && lio->lis_pos > 0) {
875 index = lov_io_layout_at(lio, lio->lis_pos - 1);
876 /* no entry found for such offset */
878 RETURN(io->ci_result = -ENODATA);
881 RETURN(lov_io_iter_init(env, ios));
884 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
885 int (*iofunc)(const struct lu_env *, struct cl_io *))
887 struct cl_io *parent = lio->lis_cl.cis_io;
888 struct lov_io_sub *sub;
892 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
893 rc = iofunc(sub->sub_env, &sub->sub_io);
897 if (parent->ci_result == 0)
898 parent->ci_result = sub->sub_io.ci_result;
903 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
906 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_lock));
909 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
912 RETURN(lov_io_call(env, cl2lov_io(env, ios), cl_io_start));
915 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
919 * It's possible that lov_io_start() wasn't called against this
920 * sub-io, either because previous sub-io failed, or upper layer
923 if (io->ci_state == CIS_IO_GOING)
926 io->ci_state = CIS_IO_FINISHED;
930 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
932 cl_io_iter_fini(env, io);
936 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
938 cl_io_unlock(env, io);
942 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
946 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
951 lov_io_data_version_end(const struct lu_env *env, const struct cl_io_slice *ios)
953 struct lov_io *lio = cl2lov_io(env, ios);
954 struct cl_io *parent = lio->lis_cl.cis_io;
955 struct cl_data_version_io *pdv = &parent->u.ci_data_version;
956 struct lov_io_sub *sub;
959 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
960 struct cl_data_version_io *sdv = &sub->sub_io.u.ci_data_version;
962 lov_io_end_wrapper(sub->sub_env, &sub->sub_io);
964 pdv->dv_data_version += sdv->dv_data_version;
965 if (pdv->dv_layout_version > sdv->dv_layout_version)
966 pdv->dv_layout_version = sdv->dv_layout_version;
968 if (parent->ci_result == 0)
969 parent->ci_result = sub->sub_io.ci_result;
975 static void lov_io_iter_fini(const struct lu_env *env,
976 const struct cl_io_slice *ios)
978 struct lov_io *lio = cl2lov_io(env, ios);
982 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
984 while (!list_empty(&lio->lis_active))
985 list_del_init(lio->lis_active.next);
989 static void lov_io_unlock(const struct lu_env *env,
990 const struct cl_io_slice *ios)
995 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
1000 static int lov_io_read_ahead(const struct lu_env *env,
1001 const struct cl_io_slice *ios,
1002 pgoff_t start, struct cl_read_ahead *ra)
1004 struct lov_io *lio = cl2lov_io(env, ios);
1005 struct lov_object *loo = lio->lis_object;
1006 struct cl_object *obj = lov2cl(loo);
1007 struct lov_layout_raid0 *r0;
1008 struct lov_io_sub *sub;
1012 unsigned int pps; /* pages per stripe */
1018 offset = cl_offset(obj, start);
1019 index = lov_io_layout_at(lio, offset);
1020 if (index < 0 || !lsm_entry_inited(loo->lo_lsm, index))
1023 /* avoid readahead to expand to stale components */
1024 if (!lov_entry(loo, index)->lle_valid)
1027 stripe = lov_stripe_number(loo->lo_lsm, index, offset);
1029 r0 = lov_r0(loo, index);
1030 if (unlikely(!r0->lo_sub[stripe]))
1033 sub = lov_sub_get(env, lio, lov_comp_index(index, stripe));
1035 RETURN(PTR_ERR(sub));
1037 lov_stripe_offset(loo->lo_lsm, index, offset, stripe, &suboff);
1038 rc = cl_io_read_ahead(sub->sub_env, &sub->sub_io,
1039 cl_index(lovsub2cl(r0->lo_sub[stripe]), suboff),
1042 CDEBUG(D_READA, DFID " cra_end = %lu, stripes = %d, rc = %d\n",
1043 PFID(lu_object_fid(lov2lu(loo))), ra->cra_end, r0->lo_nr, rc);
1048 * Adjust the stripe index by layout of comp. ra->cra_end is the
1049 * maximum page index covered by an underlying DLM lock.
1050 * This function converts cra_end from stripe level to file level, and
1051 * make sure it's not beyond stripe and component boundary.
1054 /* cra_end is stripe level, convert it into file level */
1055 ra_end = ra->cra_end;
1056 if (ra_end != CL_PAGE_EOF)
1057 ra->cra_end = lov_stripe_pgoff(loo->lo_lsm, index,
1060 /* boundary of current component */
1061 ra_end = cl_index(obj, (loff_t)lov_io_extent(lio, index)->e_end);
1062 if (ra_end != CL_PAGE_EOF && ra->cra_end >= ra_end)
1063 ra->cra_end = ra_end - 1;
1065 if (r0->lo_nr == 1) /* single stripe file */
1068 pps = lov_lse(loo, index)->lsme_stripe_size >> PAGE_SHIFT;
1070 CDEBUG(D_READA, DFID " max_index = %lu, pps = %u, index = %u, "
1071 "stripe_size = %u, stripe no = %u, start index = %lu\n",
1072 PFID(lu_object_fid(lov2lu(loo))), ra->cra_end, pps, index,
1073 lov_lse(loo, index)->lsme_stripe_size, stripe, start);
1075 /* never exceed the end of the stripe */
1076 ra->cra_end = min_t(pgoff_t,
1077 ra->cra_end, start + pps - start % pps - 1);
1082 * lov implementation of cl_operations::cio_submit() method. It takes a list
1083 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
1084 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
1087 * Major complication of this function is a need to handle memory cleansing:
1088 * cl_io_submit() is called to write out pages as a part of VM memory
1089 * reclamation, and hence it may not fail due to memory shortages (system
1090 * dead-locks otherwise). To deal with this, some resources (sub-lists,
1091 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
1092 * not-memory cleansing context), and in case of memory shortage, these
1093 * pre-allocated resources are used by lov_io_submit() under
1094 * lov_device::ld_mutex mutex.
1096 static int lov_io_submit(const struct lu_env *env,
1097 const struct cl_io_slice *ios,
1098 enum cl_req_type crt, struct cl_2queue *queue)
1100 struct cl_page_list *qin = &queue->c2_qin;
1101 struct lov_io *lio = cl2lov_io(env, ios);
1102 struct lov_io_sub *sub;
1103 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
1104 struct cl_page *page;
1109 cl_page_list_init(plist);
1110 while (qin->pl_nr > 0) {
1111 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
1113 page = cl_page_list_first(qin);
1114 if (lov_page_is_empty(page)) {
1115 cl_page_list_move(&queue->c2_qout, qin, page);
1118 * it could only be mirror read to get here therefore
1119 * the pages will be transient. We don't care about
1120 * the return code of cl_page_prep() at all.
1122 (void) cl_page_prep(env, ios->cis_io, page, crt);
1123 cl_page_completion(env, page, crt, 0);
1127 cl_2queue_init(cl2q);
1128 cl_page_list_move(&cl2q->c2_qin, qin, page);
1130 index = lov_page_index(page);
1131 while (qin->pl_nr > 0) {
1132 page = cl_page_list_first(qin);
1133 if (index != lov_page_index(page))
1136 cl_page_list_move(&cl2q->c2_qin, qin, page);
1139 sub = lov_sub_get(env, lio, index);
1141 rc = cl_io_submit_rw(sub->sub_env, &sub->sub_io,
1147 cl_page_list_splice(&cl2q->c2_qin, plist);
1148 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
1149 cl_2queue_fini(env, cl2q);
1155 cl_page_list_splice(plist, qin);
1156 cl_page_list_fini(env, plist);
1161 static int lov_io_commit_async(const struct lu_env *env,
1162 const struct cl_io_slice *ios,
1163 struct cl_page_list *queue, int from, int to,
1166 struct cl_page_list *plist = &lov_env_info(env)->lti_plist;
1167 struct lov_io *lio = cl2lov_io(env, ios);
1168 struct lov_io_sub *sub;
1169 struct cl_page *page;
1173 if (lio->lis_nr_subios == 1) {
1174 int idx = lio->lis_single_subio_index;
1176 LASSERT(!lov_page_is_empty(cl_page_list_first(queue)));
1178 sub = lov_sub_get(env, lio, idx);
1179 LASSERT(!IS_ERR(sub));
1180 LASSERT(sub == &lio->lis_single_subio);
1181 rc = cl_io_commit_async(sub->sub_env, &sub->sub_io, queue,
1186 cl_page_list_init(plist);
1187 while (queue->pl_nr > 0) {
1191 LASSERT(plist->pl_nr == 0);
1192 page = cl_page_list_first(queue);
1193 LASSERT(!lov_page_is_empty(page));
1195 cl_page_list_move(plist, queue, page);
1197 index = lov_page_index(page);
1198 while (queue->pl_nr > 0) {
1199 page = cl_page_list_first(queue);
1200 if (index != lov_page_index(page))
1203 cl_page_list_move(plist, queue, page);
1206 if (queue->pl_nr > 0) /* still has more pages */
1207 stripe_to = PAGE_SIZE;
1209 sub = lov_sub_get(env, lio, index);
1211 rc = cl_io_commit_async(sub->sub_env, &sub->sub_io,
1212 plist, from, stripe_to, cb);
1218 if (plist->pl_nr > 0) /* short write */
1224 /* for error case, add the page back into the qin list */
1225 LASSERT(ergo(rc == 0, plist->pl_nr == 0));
1226 while (plist->pl_nr > 0) {
1227 /* error occurred, add the uncommitted pages back into queue */
1228 page = cl_page_list_last(plist);
1229 cl_page_list_move_head(queue, plist, page);
1235 static int lov_io_fault_start(const struct lu_env *env,
1236 const struct cl_io_slice *ios)
1238 struct cl_fault_io *fio;
1240 struct lov_io_sub *sub;
1244 fio = &ios->cis_io->u.ci_fault;
1245 lio = cl2lov_io(env, ios);
1246 sub = lov_sub_get(env, lio, lov_page_index(fio->ft_page));
1247 sub->sub_io.u.ci_fault.ft_nob = fio->ft_nob;
1249 RETURN(lov_io_start(env, ios));
1252 static void lov_io_fsync_end(const struct lu_env *env,
1253 const struct cl_io_slice *ios)
1255 struct lov_io *lio = cl2lov_io(env, ios);
1256 struct lov_io_sub *sub;
1257 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
1261 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
1262 struct cl_io *subio = &sub->sub_io;
1264 lov_io_end_wrapper(sub->sub_env, subio);
1266 if (subio->ci_result == 0)
1267 *written += subio->u.ci_fsync.fi_nr_written;
1272 static const struct cl_io_operations lov_io_ops = {
1275 .cio_fini = lov_io_fini,
1276 .cio_iter_init = lov_io_rw_iter_init,
1277 .cio_iter_fini = lov_io_iter_fini,
1278 .cio_lock = lov_io_lock,
1279 .cio_unlock = lov_io_unlock,
1280 .cio_start = lov_io_start,
1281 .cio_end = lov_io_end
1284 .cio_fini = lov_io_fini,
1285 .cio_iter_init = lov_io_rw_iter_init,
1286 .cio_iter_fini = lov_io_iter_fini,
1287 .cio_lock = lov_io_lock,
1288 .cio_unlock = lov_io_unlock,
1289 .cio_start = lov_io_start,
1290 .cio_end = lov_io_end
1293 .cio_fini = lov_io_fini,
1294 .cio_iter_init = lov_io_setattr_iter_init,
1295 .cio_iter_fini = lov_io_iter_fini,
1296 .cio_lock = lov_io_lock,
1297 .cio_unlock = lov_io_unlock,
1298 .cio_start = lov_io_start,
1299 .cio_end = lov_io_end
1301 [CIT_DATA_VERSION] = {
1302 .cio_fini = lov_io_fini,
1303 .cio_iter_init = lov_io_iter_init,
1304 .cio_iter_fini = lov_io_iter_fini,
1305 .cio_lock = lov_io_lock,
1306 .cio_unlock = lov_io_unlock,
1307 .cio_start = lov_io_start,
1308 .cio_end = lov_io_data_version_end,
1311 .cio_fini = lov_io_fini,
1312 .cio_iter_init = lov_io_iter_init,
1313 .cio_iter_fini = lov_io_iter_fini,
1314 .cio_lock = lov_io_lock,
1315 .cio_unlock = lov_io_unlock,
1316 .cio_start = lov_io_fault_start,
1317 .cio_end = lov_io_end
1320 .cio_fini = lov_io_fini,
1321 .cio_iter_init = lov_io_iter_init,
1322 .cio_iter_fini = lov_io_iter_fini,
1323 .cio_lock = lov_io_lock,
1324 .cio_unlock = lov_io_unlock,
1325 .cio_start = lov_io_start,
1326 .cio_end = lov_io_fsync_end
1329 .cio_fini = lov_io_fini,
1330 .cio_iter_init = lov_io_iter_init,
1331 .cio_iter_fini = lov_io_iter_fini,
1332 .cio_lock = lov_io_lock,
1333 .cio_unlock = lov_io_unlock,
1334 .cio_start = lov_io_start,
1335 .cio_end = lov_io_end
1338 .cio_fini = lov_io_fini,
1341 .cio_fini = lov_io_fini
1344 .cio_read_ahead = lov_io_read_ahead,
1345 .cio_submit = lov_io_submit,
1346 .cio_commit_async = lov_io_commit_async,
1349 /*****************************************************************************
1351 * Empty lov io operations.
1355 static void lov_empty_io_fini(const struct lu_env *env,
1356 const struct cl_io_slice *ios)
1358 struct lov_object *lov = cl2lov(ios->cis_obj);
1361 if (atomic_dec_and_test(&lov->lo_active_ios))
1362 wake_up_all(&lov->lo_waitq);
1366 static int lov_empty_io_submit(const struct lu_env *env,
1367 const struct cl_io_slice *ios,
1368 enum cl_req_type crt, struct cl_2queue *queue)
1373 static void lov_empty_impossible(const struct lu_env *env,
1374 struct cl_io_slice *ios)
1379 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
1382 * An io operation vector for files without stripes.
1384 static const struct cl_io_operations lov_empty_io_ops = {
1387 .cio_fini = lov_empty_io_fini,
1389 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
1390 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
1391 .cio_start = LOV_EMPTY_IMPOSSIBLE,
1392 .cio_end = LOV_EMPTY_IMPOSSIBLE
1396 .cio_fini = lov_empty_io_fini,
1397 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
1398 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
1399 .cio_start = LOV_EMPTY_IMPOSSIBLE,
1400 .cio_end = LOV_EMPTY_IMPOSSIBLE
1403 .cio_fini = lov_empty_io_fini,
1404 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
1405 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
1406 .cio_start = LOV_EMPTY_IMPOSSIBLE,
1407 .cio_end = LOV_EMPTY_IMPOSSIBLE
1410 .cio_fini = lov_empty_io_fini,
1411 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
1412 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
1413 .cio_start = LOV_EMPTY_IMPOSSIBLE,
1414 .cio_end = LOV_EMPTY_IMPOSSIBLE
1417 .cio_fini = lov_empty_io_fini
1420 .cio_fini = lov_empty_io_fini
1423 .cio_fini = lov_empty_io_fini
1426 .cio_fini = lov_empty_io_fini
1429 .cio_submit = lov_empty_io_submit,
1430 .cio_commit_async = LOV_EMPTY_IMPOSSIBLE
1433 int lov_io_init_composite(const struct lu_env *env, struct cl_object *obj,
1436 struct lov_io *lio = lov_env_io(env);
1437 struct lov_object *lov = cl2lov(obj);
1442 INIT_LIST_HEAD(&lio->lis_active);
1443 result = lov_io_slice_init(lio, lov, io);
1447 result = lov_io_subio_init(env, lio, io);
1449 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
1450 atomic_inc(&lov->lo_active_ios);
1454 io->ci_result = result < 0 ? result : 0;
1458 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
1461 struct lov_object *lov = cl2lov(obj);
1462 struct lov_io *lio = lov_env_io(env);
1466 lio->lis_object = lov;
1467 switch (io->ci_type) {
1478 case CIT_DATA_VERSION:
1486 CERROR("Page fault on a file without stripes: "DFID"\n",
1487 PFID(lu_object_fid(&obj->co_lu)));
1491 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
1492 atomic_inc(&lov->lo_active_ios);
1495 io->ci_result = result < 0 ? result : 0;
1499 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
1502 struct lov_object *lov = cl2lov(obj);
1503 struct lov_io *lio = lov_env_io(env);
1507 LASSERT(lov->lo_lsm != NULL);
1508 lio->lis_object = lov;
1510 switch (io->ci_type) {
1512 LASSERTF(0, "invalid type %d\n", io->ci_type);
1513 result = -EOPNOTSUPP;
1519 case CIT_DATA_VERSION:
1524 * the truncate to 0 is managed by MDT:
1525 * - in open, for open O_TRUNC
1526 * - in setattr, for truncate
1528 /* the truncate is for size > 0 so triggers a restore */
1529 if (cl_io_is_trunc(io)) {
1530 io->ci_restore_needed = 1;
1538 io->ci_restore_needed = 1;
1544 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
1545 atomic_inc(&lov->lo_active_ios);
1548 io->ci_result = result < 0 ? result : 0;
1553 * Return the index in composite:lo_entries by the file offset
1555 int lov_io_layout_at(struct lov_io *lio, __u64 offset)
1557 struct lov_object *lov = lio->lis_object;
1558 struct lov_layout_composite *comp = &lov->u.composite;
1559 int start_index = 0;
1560 int end_index = comp->lo_entry_count - 1;
1563 LASSERT(lov->lo_type == LLT_COMP);
1565 /* This is actual file offset so nothing can cover eof. */
1566 if (offset == LUSTRE_EOF)
1569 if (lov_is_flr(lov)) {
1570 struct lov_mirror_entry *lre;
1572 LASSERT(lio->lis_mirror_index >= 0);
1574 lre = &comp->lo_mirrors[lio->lis_mirror_index];
1575 start_index = lre->lre_start;
1576 end_index = lre->lre_end;
1579 for (i = start_index; i <= end_index; i++) {
1580 struct lov_layout_entry *lle = lov_entry(lov, i);
1582 if ((offset >= lle->lle_extent->e_start &&
1583 offset < lle->lle_extent->e_end) ||
1584 (offset == OBD_OBJECT_EOF &&
1585 lle->lle_extent->e_end == OBD_OBJECT_EOF))