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) 2012, 2017, Intel Corporation.
30 * This file is part of Lustre, http://www.lustre.org/
31 * Lustre is a trademark of Sun Microsystems, Inc.
33 * osc cache management.
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_OSC
40 #include <lustre_osc.h>
42 #include "osc_internal.h"
44 static int extent_debug; /* set it to be true for more debug */
46 static void osc_update_pending(struct osc_object *obj, int cmd, int delta);
47 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
48 enum osc_extent_state state);
49 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
50 struct osc_async_page *oap, int sent, int rc);
51 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
53 static int osc_refresh_count(const struct lu_env *env,
54 struct osc_async_page *oap, int cmd);
55 static int osc_io_unplug_async(const struct lu_env *env,
56 struct client_obd *cli, struct osc_object *osc);
57 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
58 unsigned int lost_grant, unsigned int dirty_grant);
60 static void osc_extent_tree_dump0(int mask, struct osc_object *obj,
61 const char *func, int line);
62 #define osc_extent_tree_dump(mask, obj) \
63 osc_extent_tree_dump0(mask, obj, __func__, __LINE__)
65 static void osc_unreserve_grant(struct client_obd *cli, unsigned int reserved,
72 /* ------------------ osc extent ------------------ */
73 static inline char *ext_flags(struct osc_extent *ext, char *flags)
76 *buf++ = ext->oe_rw ? 'r' : 'w';
89 if (ext->oe_trunc_pending)
91 if (ext->oe_fsync_wait)
97 #define EXTSTR "[%lu -> %lu/%lu]"
98 #define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end
99 static const char *oes_strings[] = {
100 "inv", "active", "cache", "locking", "lockdone", "rpc", "trunc", NULL };
102 #define OSC_EXTENT_DUMP_WITH_LOC(file, func, line, mask, extent, fmt, ...) do {\
103 static struct cfs_debug_limit_state cdls; \
104 struct osc_extent *__ext = (extent); \
107 __CDEBUG_WITH_LOC(file, func, line, mask, &cdls, \
108 "extent %p@{" EXTSTR ", " \
109 "[%d|%d|%c|%s|%s|%p], [%d|%d|%c|%c|%p|%u|%p]} " fmt, \
110 /* ----- extent part 0 ----- */ \
111 __ext, EXTPARA(__ext), \
112 /* ----- part 1 ----- */ \
113 atomic_read(&__ext->oe_refc), \
114 atomic_read(&__ext->oe_users), \
115 list_empty_marker(&__ext->oe_link), \
116 oes_strings[__ext->oe_state], ext_flags(__ext, __buf), \
118 /* ----- part 2 ----- */ \
119 __ext->oe_grants, __ext->oe_nr_pages, \
120 list_empty_marker(&__ext->oe_pages), \
121 waitqueue_active(&__ext->oe_waitq) ? '+' : '-', \
122 __ext->oe_dlmlock, __ext->oe_mppr, __ext->oe_owner, \
123 /* ----- part 4 ----- */ \
125 if (mask == D_ERROR && __ext->oe_dlmlock != NULL) \
126 LDLM_ERROR(__ext->oe_dlmlock, "extent: %p", __ext); \
128 LDLM_DEBUG(__ext->oe_dlmlock, "extent: %p", __ext); \
131 #define OSC_EXTENT_DUMP(mask, ext, fmt, ...) \
132 OSC_EXTENT_DUMP_WITH_LOC(__FILE__, __func__, __LINE__, \
133 mask, ext, fmt, ## __VA_ARGS__)
136 #define EASSERTF(expr, ext, fmt, args...) do { \
138 OSC_EXTENT_DUMP(D_ERROR, (ext), fmt, ##args); \
139 osc_extent_tree_dump(D_ERROR, (ext)->oe_obj); \
145 #define EASSERT(expr, ext) EASSERTF(expr, ext, "\n")
147 static inline struct osc_extent *rb_extent(struct rb_node *n)
152 return container_of(n, struct osc_extent, oe_node);
155 static inline struct osc_extent *next_extent(struct osc_extent *ext)
160 LASSERT(ext->oe_intree);
161 return rb_extent(rb_next(&ext->oe_node));
164 static inline struct osc_extent *prev_extent(struct osc_extent *ext)
169 LASSERT(ext->oe_intree);
170 return rb_extent(rb_prev(&ext->oe_node));
173 static inline struct osc_extent *first_extent(struct osc_object *obj)
175 return rb_extent(rb_first(&obj->oo_root));
178 /* object must be locked by caller. */
179 static int osc_extent_sanity_check0(struct osc_extent *ext,
180 const char *func, const int line)
182 struct osc_object *obj = ext->oe_obj;
183 struct osc_async_page *oap;
187 assert_osc_object_is_locked(obj);
189 if (ext->oe_state >= OES_STATE_MAX)
192 if (atomic_read(&ext->oe_refc) <= 0)
195 if (atomic_read(&ext->oe_refc) < atomic_read(&ext->oe_users))
198 switch (ext->oe_state) {
200 if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
205 if (atomic_read(&ext->oe_users) == 0)
209 if (ext->oe_fsync_wait && !ext->oe_urgent)
213 if (ext->oe_grants == 0)
215 if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp)
219 if (atomic_read(&ext->oe_users) > 0)
223 if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start)
226 if (ext->oe_sync && ext->oe_grants > 0)
229 if (ext->oe_dlmlock != NULL &&
230 ext->oe_dlmlock->l_resource->lr_type == LDLM_EXTENT &&
231 !ldlm_is_failed(ext->oe_dlmlock)) {
232 struct ldlm_extent *extent;
234 extent = &ext->oe_dlmlock->l_policy_data.l_extent;
235 if (!(extent->start <= cl_offset(osc2cl(obj), ext->oe_start) &&
236 extent->end >= cl_offset(osc2cl(obj), ext->oe_max_end)))
239 if (!(ext->oe_dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP)))
243 if (ext->oe_nr_pages > ext->oe_mppr)
246 /* Do not verify page list if extent is in RPC. This is because an
247 * in-RPC extent is supposed to be exclusively accessible w/o lock. */
248 if (ext->oe_state > OES_CACHE)
255 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
256 pgoff_t index = osc_index(oap2osc(oap));
258 if (index > ext->oe_end || index < ext->oe_start)
261 if (page_count != ext->oe_nr_pages)
266 OSC_EXTENT_DUMP_WITH_LOC(__FILE__, func, line, D_ERROR, ext,
267 "sanity check %p failed: rc = %d\n",
272 #define sanity_check_nolock(ext) \
273 osc_extent_sanity_check0(ext, __func__, __LINE__)
275 #define sanity_check(ext) ({ \
277 osc_object_lock((ext)->oe_obj); \
278 __res = sanity_check_nolock(ext); \
279 osc_object_unlock((ext)->oe_obj); \
284 overlapped(const struct osc_extent *ex1, const struct osc_extent *ex2)
286 return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
290 * sanity check - to make sure there is no overlapped extent in the tree.
292 static int osc_extent_is_overlapped(struct osc_object *obj,
293 struct osc_extent *ext)
295 struct osc_extent *tmp;
297 assert_osc_object_is_locked(obj);
302 for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) {
305 if (overlapped(tmp, ext))
311 static void osc_extent_state_set(struct osc_extent *ext, int state)
313 assert_osc_object_is_locked(ext->oe_obj);
314 LASSERT(state >= OES_INV && state < OES_STATE_MAX);
316 /* Never try to sanity check a state changing extent :-) */
317 /* LASSERT(sanity_check_nolock(ext) == 0); */
319 /* TODO: validate the state machine */
320 ext->oe_state = state;
321 wake_up_all(&ext->oe_waitq);
324 static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
326 struct osc_extent *ext;
328 OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_NOFS);
332 RB_CLEAR_NODE(&ext->oe_node);
334 cl_object_get(osc2cl(obj));
335 atomic_set(&ext->oe_refc, 1);
336 atomic_set(&ext->oe_users, 0);
337 INIT_LIST_HEAD(&ext->oe_link);
338 ext->oe_state = OES_INV;
339 INIT_LIST_HEAD(&ext->oe_pages);
340 init_waitqueue_head(&ext->oe_waitq);
341 ext->oe_dlmlock = NULL;
346 static void osc_extent_free(struct osc_extent *ext)
348 OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
351 static struct osc_extent *osc_extent_get(struct osc_extent *ext)
353 LASSERT(atomic_read(&ext->oe_refc) >= 0);
354 atomic_inc(&ext->oe_refc);
358 static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
360 LASSERT(atomic_read(&ext->oe_refc) > 0);
361 if (atomic_dec_and_test(&ext->oe_refc)) {
362 LASSERT(list_empty(&ext->oe_link));
363 LASSERT(atomic_read(&ext->oe_users) == 0);
364 LASSERT(ext->oe_state == OES_INV);
365 LASSERT(!ext->oe_intree);
367 if (ext->oe_dlmlock != NULL) {
368 lu_ref_add(&ext->oe_dlmlock->l_reference,
370 LDLM_LOCK_PUT(ext->oe_dlmlock);
371 ext->oe_dlmlock = NULL;
373 cl_object_put(env, osc2cl(ext->oe_obj));
374 osc_extent_free(ext);
379 * osc_extent_put_trust() is a special version of osc_extent_put() when
380 * it's known that the caller is not the last user. This is to address the
381 * problem of lacking of lu_env ;-).
383 static void osc_extent_put_trust(struct osc_extent *ext)
385 LASSERT(atomic_read(&ext->oe_refc) > 1);
386 assert_osc_object_is_locked(ext->oe_obj);
387 atomic_dec(&ext->oe_refc);
391 * Return the extent which includes pgoff @index, or return the greatest
392 * previous extent in the tree.
394 static struct osc_extent *osc_extent_search(struct osc_object *obj,
397 struct rb_node *n = obj->oo_root.rb_node;
398 struct osc_extent *tmp, *p = NULL;
400 assert_osc_object_is_locked(obj);
403 if (index < tmp->oe_start) {
405 } else if (index > tmp->oe_end) {
416 * Return the extent covering @index, otherwise return NULL.
417 * caller must have held object lock.
419 static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
422 struct osc_extent *ext;
424 ext = osc_extent_search(obj, index);
425 if (ext != NULL && ext->oe_start <= index && index <= ext->oe_end)
426 return osc_extent_get(ext);
430 /* caller must have held object lock. */
431 static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
433 struct rb_node **n = &obj->oo_root.rb_node;
434 struct rb_node *parent = NULL;
435 struct osc_extent *tmp;
437 LASSERT(ext->oe_intree == 0);
438 LASSERT(ext->oe_obj == obj);
439 assert_osc_object_is_locked(obj);
444 if (ext->oe_end < tmp->oe_start)
446 else if (ext->oe_start > tmp->oe_end)
449 EASSERTF(0, tmp, EXTSTR"\n", EXTPARA(ext));
451 rb_link_node(&ext->oe_node, parent, n);
452 rb_insert_color(&ext->oe_node, &obj->oo_root);
457 /* caller must have held object lock. */
458 static void osc_extent_erase(struct osc_extent *ext)
460 struct osc_object *obj = ext->oe_obj;
461 assert_osc_object_is_locked(obj);
462 if (ext->oe_intree) {
463 rb_erase(&ext->oe_node, &obj->oo_root);
465 /* rbtree held a refcount */
466 osc_extent_put_trust(ext);
470 static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
472 struct osc_object *obj = ext->oe_obj;
474 assert_osc_object_is_locked(obj);
475 LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE);
476 if (ext->oe_state == OES_CACHE) {
477 osc_extent_state_set(ext, OES_ACTIVE);
478 osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages);
480 atomic_inc(&ext->oe_users);
481 list_del_init(&ext->oe_link);
482 return osc_extent_get(ext);
485 static void __osc_extent_remove(struct osc_extent *ext)
487 assert_osc_object_is_locked(ext->oe_obj);
488 LASSERT(list_empty(&ext->oe_pages));
489 osc_extent_erase(ext);
490 list_del_init(&ext->oe_link);
491 osc_extent_state_set(ext, OES_INV);
492 OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
495 static void osc_extent_remove(struct osc_extent *ext)
497 struct osc_object *obj = ext->oe_obj;
499 osc_object_lock(obj);
500 __osc_extent_remove(ext);
501 osc_object_unlock(obj);
505 * This function is used to merge extents to get better performance. It checks
506 * if @cur and @victim are contiguous at block level.
508 static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
509 struct osc_extent *victim)
511 struct osc_object *obj = cur->oe_obj;
512 struct client_obd *cli = osc_cli(obj);
517 LASSERT(cur->oe_state == OES_CACHE);
518 assert_osc_object_is_locked(obj);
522 if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
525 if (cur->oe_max_end != victim->oe_max_end)
528 LASSERT(cur->oe_dlmlock == victim->oe_dlmlock);
529 ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_SHIFT;
530 chunk_start = cur->oe_start >> ppc_bits;
531 chunk_end = cur->oe_end >> ppc_bits;
532 if (chunk_start != (victim->oe_end >> ppc_bits) + 1 &&
533 chunk_end + 1 != victim->oe_start >> ppc_bits)
536 /* overall extent size should not exceed the max supported limit
537 * reported by the server */
538 if (cur->oe_end - cur->oe_start + 1 +
539 victim->oe_end - victim->oe_start + 1 > cli->cl_max_extent_pages)
542 OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
544 cur->oe_start = min(cur->oe_start, victim->oe_start);
545 cur->oe_end = max(cur->oe_end, victim->oe_end);
546 /* per-extent tax should be accounted only once for the whole extent */
547 cur->oe_grants += victim->oe_grants - cli->cl_grant_extent_tax;
548 cur->oe_nr_pages += victim->oe_nr_pages;
549 /* only the following bits are needed to merge */
550 cur->oe_urgent |= victim->oe_urgent;
551 cur->oe_memalloc |= victim->oe_memalloc;
552 list_splice_init(&victim->oe_pages, &cur->oe_pages);
553 list_del_init(&victim->oe_link);
554 victim->oe_nr_pages = 0;
556 osc_extent_get(victim);
557 __osc_extent_remove(victim);
558 osc_extent_put(env, victim);
560 OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
565 * Drop user count of osc_extent, and unplug IO asynchronously.
567 int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
569 struct osc_object *obj = ext->oe_obj;
570 struct client_obd *cli = osc_cli(obj);
574 LASSERT(atomic_read(&ext->oe_users) > 0);
575 LASSERT(sanity_check(ext) == 0);
576 LASSERT(ext->oe_grants > 0);
578 if (atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) {
579 LASSERT(ext->oe_state == OES_ACTIVE);
580 if (ext->oe_trunc_pending) {
581 /* a truncate process is waiting for this extent.
582 * This may happen due to a race, check
583 * osc_cache_truncate_start(). */
584 osc_extent_state_set(ext, OES_TRUNC);
585 ext->oe_trunc_pending = 0;
586 osc_object_unlock(obj);
590 osc_extent_state_set(ext, OES_CACHE);
591 osc_update_pending(obj, OBD_BRW_WRITE,
594 /* try to merge the previous and next extent. */
595 if (osc_extent_merge(env, ext, prev_extent(ext)) == 0)
596 grant += cli->cl_grant_extent_tax;
597 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
598 grant += cli->cl_grant_extent_tax;
601 list_move_tail(&ext->oe_link,
602 &obj->oo_urgent_exts);
603 else if (ext->oe_nr_pages == ext->oe_mppr) {
604 list_move_tail(&ext->oe_link,
607 osc_object_unlock(obj);
609 osc_unreserve_grant(cli, 0, grant);
612 osc_io_unplug_async(env, cli, obj);
614 osc_extent_put(env, ext);
619 * Find or create an extent which includes @index, core function to manage
622 static struct osc_extent *osc_extent_find(const struct lu_env *env,
623 struct osc_object *obj, pgoff_t index,
624 unsigned int *grants)
626 struct client_obd *cli = osc_cli(obj);
627 struct osc_lock *olck;
628 struct cl_lock_descr *descr;
629 struct osc_extent *cur;
630 struct osc_extent *ext;
631 struct osc_extent *conflict = NULL;
632 struct osc_extent *found = NULL;
635 unsigned int max_pages; /* max_pages_per_rpc */
636 unsigned int chunksize;
637 int ppc_bits; /* pages per chunk bits */
642 cur = osc_extent_alloc(obj);
644 RETURN(ERR_PTR(-ENOMEM));
646 olck = osc_env_io(env)->oi_write_osclock;
647 LASSERTF(olck != NULL, "page %lu is not covered by lock\n", index);
648 LASSERT(olck->ols_state == OLS_GRANTED);
650 descr = &olck->ols_cl.cls_lock->cll_descr;
651 LASSERT(descr->cld_mode >= CLM_WRITE);
653 LASSERTF(cli->cl_chunkbits >= PAGE_SHIFT,
654 "chunkbits: %u\n", cli->cl_chunkbits);
655 ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
656 chunk_mask = ~((1 << ppc_bits) - 1);
657 chunksize = 1 << cli->cl_chunkbits;
658 chunk = index >> ppc_bits;
660 /* align end to RPC edge. */
661 max_pages = cli->cl_max_pages_per_rpc;
662 if ((max_pages & ~chunk_mask) != 0) {
663 CERROR("max_pages: %#x chunkbits: %u chunk_mask: %#lx\n",
664 max_pages, cli->cl_chunkbits, chunk_mask);
665 RETURN(ERR_PTR(-EINVAL));
667 max_end = index - (index % max_pages) + max_pages - 1;
668 max_end = min_t(pgoff_t, max_end, descr->cld_end);
670 /* initialize new extent by parameters so far */
671 cur->oe_max_end = max_end;
672 cur->oe_start = index & chunk_mask;
673 cur->oe_end = ((index + ~chunk_mask + 1) & chunk_mask) - 1;
674 if (cur->oe_start < descr->cld_start)
675 cur->oe_start = descr->cld_start;
676 if (cur->oe_end > max_end)
677 cur->oe_end = max_end;
679 cur->oe_mppr = max_pages;
680 if (olck->ols_dlmlock != NULL) {
681 LASSERT(olck->ols_hold);
682 cur->oe_dlmlock = LDLM_LOCK_GET(olck->ols_dlmlock);
683 lu_ref_add(&olck->ols_dlmlock->l_reference, "osc_extent", cur);
686 /* grants has been allocated by caller */
687 LASSERTF(*grants >= chunksize + cli->cl_grant_extent_tax,
688 "%u/%u/%u.\n", *grants, chunksize, cli->cl_grant_extent_tax);
689 LASSERTF((max_end - cur->oe_start) < max_pages, EXTSTR"\n",
693 osc_object_lock(obj);
694 ext = osc_extent_search(obj, cur->oe_start);
696 ext = first_extent(obj);
697 while (ext != NULL) {
698 pgoff_t ext_chk_start = ext->oe_start >> ppc_bits;
699 pgoff_t ext_chk_end = ext->oe_end >> ppc_bits;
701 LASSERT(sanity_check_nolock(ext) == 0);
702 if (chunk > ext_chk_end + 1 || chunk < ext_chk_start)
705 /* if covering by different locks, no chance to match */
706 if (olck->ols_dlmlock != ext->oe_dlmlock) {
707 EASSERTF(!overlapped(ext, cur), ext,
708 EXTSTR"\n", EXTPARA(cur));
710 ext = next_extent(ext);
714 /* discontiguous chunks? */
715 if (chunk + 1 < ext_chk_start) {
716 ext = next_extent(ext);
720 /* ok, from now on, ext and cur have these attrs:
721 * 1. covered by the same lock
722 * 2. contiguous at chunk level or overlapping. */
724 if (overlapped(ext, cur)) {
725 /* cur is the minimum unit, so overlapping means
727 EASSERTF((ext->oe_start <= cur->oe_start &&
728 ext->oe_end >= cur->oe_end),
729 ext, EXTSTR"\n", EXTPARA(cur));
731 if (ext->oe_state > OES_CACHE || ext->oe_fsync_wait) {
732 /* for simplicity, we wait for this extent to
733 * finish before going forward. */
734 conflict = osc_extent_get(ext);
738 found = osc_extent_hold(ext);
742 /* non-overlapped extent */
743 if (ext->oe_state != OES_CACHE || ext->oe_fsync_wait) {
744 /* we can't do anything for a non OES_CACHE extent, or
745 * if there is someone waiting for this extent to be
746 * flushed, try next one. */
747 ext = next_extent(ext);
751 /* check if they belong to the same rpc slot before trying to
752 * merge. the extents are not overlapped and contiguous at
753 * chunk level to get here. */
754 if (ext->oe_max_end != max_end) {
755 /* if they don't belong to the same RPC slot or
756 * max_pages_per_rpc has ever changed, do not merge. */
757 ext = next_extent(ext);
761 /* check whether maximum extent size will be hit */
762 if ((ext_chk_end - ext_chk_start + 1 + 1) << ppc_bits >
763 cli->cl_max_extent_pages) {
764 ext = next_extent(ext);
768 /* it's required that an extent must be contiguous at chunk
769 * level so that we know the whole extent is covered by grant
770 * (the pages in the extent are NOT required to be contiguous).
771 * Otherwise, it will be too much difficult to know which
772 * chunks have grants allocated. */
774 /* try to do front merge - extend ext's start */
775 if (chunk + 1 == ext_chk_start) {
776 /* ext must be chunk size aligned */
777 EASSERT((ext->oe_start & ~chunk_mask) == 0, ext);
779 /* pull ext's start back to cover cur */
780 ext->oe_start = cur->oe_start;
781 ext->oe_grants += chunksize;
782 LASSERT(*grants >= chunksize);
783 *grants -= chunksize;
785 found = osc_extent_hold(ext);
786 } else if (chunk == ext_chk_end + 1) {
788 ext->oe_end = cur->oe_end;
789 ext->oe_grants += chunksize;
790 LASSERT(*grants >= chunksize);
791 *grants -= chunksize;
793 /* try to merge with the next one because we just fill
795 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
796 /* we can save extent tax from next extent */
797 *grants += cli->cl_grant_extent_tax;
799 found = osc_extent_hold(ext);
804 ext = next_extent(ext);
807 osc_extent_tree_dump(D_CACHE, obj);
809 LASSERT(conflict == NULL);
810 if (!IS_ERR(found)) {
811 LASSERT(found->oe_dlmlock == cur->oe_dlmlock);
812 OSC_EXTENT_DUMP(D_CACHE, found,
813 "found caching ext for %lu.\n", index);
815 } else if (conflict == NULL) {
816 /* create a new extent */
817 EASSERT(osc_extent_is_overlapped(obj, cur) == 0, cur);
818 cur->oe_grants = chunksize + cli->cl_grant_extent_tax;
819 LASSERT(*grants >= cur->oe_grants);
820 *grants -= cur->oe_grants;
822 cur->oe_state = OES_CACHE;
823 found = osc_extent_hold(cur);
824 osc_extent_insert(obj, cur);
825 OSC_EXTENT_DUMP(D_CACHE, cur, "add into tree %lu/%lu.\n",
826 index, descr->cld_end);
828 osc_object_unlock(obj);
830 if (conflict != NULL) {
831 LASSERT(found == NULL);
833 /* waiting for IO to finish. Please notice that it's impossible
834 * to be an OES_TRUNC extent. */
835 rc = osc_extent_wait(env, conflict, OES_INV);
836 osc_extent_put(env, conflict);
839 GOTO(out, found = ERR_PTR(rc));
846 osc_extent_put(env, cur);
851 * Called when IO is finished to an extent.
853 int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
856 struct client_obd *cli = osc_cli(ext->oe_obj);
857 struct osc_async_page *oap;
858 struct osc_async_page *tmp;
859 int nr_pages = ext->oe_nr_pages;
861 int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
866 OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n");
868 ext->oe_rc = rc ?: ext->oe_nr_pages;
869 EASSERT(ergo(rc == 0, ext->oe_state == OES_RPC), ext);
871 osc_lru_add_batch(cli, &ext->oe_pages);
872 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
874 list_del_init(&oap->oap_rpc_item);
875 list_del_init(&oap->oap_pending_item);
876 if (last_off <= oap->oap_obj_off) {
877 last_off = oap->oap_obj_off;
878 last_count = oap->oap_count;
882 osc_ap_completion(env, cli, oap, sent, rc);
884 EASSERT(ext->oe_nr_pages == 0, ext);
887 lost_grant = ext->oe_grants;
888 } else if (blocksize < PAGE_SIZE &&
889 last_count != PAGE_SIZE) {
890 /* For short writes we shouldn't count parts of pages that
891 * span a whole chunk on the OST side, or our accounting goes
892 * wrong. Should match the code in filter_grant_check. */
893 int offset = last_off & ~PAGE_MASK;
894 int count = last_count + (offset & (blocksize - 1));
895 int end = (offset + last_count) & (blocksize - 1);
897 count += blocksize - end;
899 lost_grant = PAGE_SIZE - count;
901 if (ext->oe_grants > 0)
902 osc_free_grant(cli, nr_pages, lost_grant, ext->oe_grants);
904 osc_extent_remove(ext);
905 /* put the refcount for RPC */
906 osc_extent_put(env, ext);
910 static int extent_wait_cb(struct osc_extent *ext, enum osc_extent_state state)
914 osc_object_lock(ext->oe_obj);
915 ret = ext->oe_state == state;
916 osc_object_unlock(ext->oe_obj);
922 * Wait for the extent's state to become @state.
924 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
925 enum osc_extent_state state)
927 struct osc_object *obj = ext->oe_obj;
931 osc_object_lock(obj);
932 LASSERT(sanity_check_nolock(ext) == 0);
933 /* `Kick' this extent only if the caller is waiting for it to be
935 if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp) {
936 if (ext->oe_state == OES_ACTIVE) {
938 } else if (ext->oe_state == OES_CACHE) {
940 osc_extent_hold(ext);
944 osc_object_unlock(obj);
946 osc_extent_release(env, ext);
948 /* wait for the extent until its state becomes @state */
949 rc = wait_event_idle_timeout(ext->oe_waitq, extent_wait_cb(ext, state),
950 cfs_time_seconds(600));
952 OSC_EXTENT_DUMP(D_ERROR, ext,
953 "%s: wait ext to %u timedout, recovery in progress?\n",
954 cli_name(osc_cli(obj)), state);
956 wait_event_idle(ext->oe_waitq, extent_wait_cb(ext, state));
966 * Discard pages with index greater than @size. If @ext is overlapped with
967 * @size, then partial truncate happens.
969 static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
974 struct osc_object *obj = ext->oe_obj;
975 struct client_obd *cli = osc_cli(obj);
976 struct osc_async_page *oap;
977 struct osc_async_page *tmp;
978 struct pagevec *pvec;
979 int pages_in_chunk = 0;
980 int ppc_bits = cli->cl_chunkbits -
982 __u64 trunc_chunk = trunc_index >> ppc_bits;
989 LASSERT(sanity_check(ext) == 0);
990 LASSERT(ext->oe_state == OES_TRUNC);
991 LASSERT(!ext->oe_urgent);
993 /* Request new lu_env.
994 * We can't use that env from osc_cache_truncate_start() because
995 * it's from lov_io_sub and not fully initialized. */
996 env = cl_env_get(&refcheck);
998 RETURN(PTR_ERR(env));
1000 io = osc_env_thread_io(env);
1001 io->ci_obj = cl_object_top(osc2cl(obj));
1002 io->ci_ignore_layout = 1;
1003 pvec = &osc_env_info(env)->oti_pagevec;
1004 ll_pagevec_init(pvec, 0);
1005 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
1009 /* discard all pages with index greater than trunc_index */
1010 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
1012 pgoff_t index = osc_index(oap2osc(oap));
1013 struct cl_page *page = oap2cl_page(oap);
1015 LASSERT(list_empty(&oap->oap_rpc_item));
1017 /* only discard the pages with their index greater than
1018 * trunc_index, and ... */
1019 if (index < trunc_index ||
1020 (index == trunc_index && partial)) {
1021 /* accounting how many pages remaining in the chunk
1022 * so that we can calculate grants correctly. */
1023 if (index >> ppc_bits == trunc_chunk)
1028 list_del_init(&oap->oap_pending_item);
1031 lu_ref_add(&page->cp_reference, "truncate", current);
1033 if (cl_page_own(env, io, page) == 0) {
1034 cl_page_discard(env, io, page);
1035 cl_page_disown(env, io, page);
1037 LASSERT(page->cp_state == CPS_FREEING);
1041 lu_ref_del(&page->cp_reference, "truncate", current);
1042 cl_pagevec_put(env, page, pvec);
1047 pagevec_release(pvec);
1049 EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial,
1050 ext->oe_nr_pages == 0),
1051 ext, "trunc_index %lu, partial %d\n", trunc_index, partial);
1053 osc_object_lock(obj);
1054 if (ext->oe_nr_pages == 0) {
1055 LASSERT(pages_in_chunk == 0);
1056 grants = ext->oe_grants;
1058 } else { /* calculate how many grants we can free */
1059 int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
1063 /* if there is no pages in this chunk, we can also free grants
1064 * for the last chunk */
1065 if (pages_in_chunk == 0) {
1066 /* if this is the 1st chunk and no pages in this chunk,
1067 * ext->oe_nr_pages must be zero, so we should be in
1068 * the other if-clause. */
1069 LASSERT(trunc_chunk > 0);
1074 /* this is what we can free from this extent */
1075 grants = chunks << cli->cl_chunkbits;
1076 ext->oe_grants -= grants;
1077 last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
1078 ext->oe_end = min(last_index, ext->oe_max_end);
1079 LASSERT(ext->oe_end >= ext->oe_start);
1080 LASSERT(ext->oe_grants > 0);
1082 osc_object_unlock(obj);
1084 if (grants > 0 || nr_pages > 0)
1085 osc_free_grant(cli, nr_pages, grants, grants);
1088 cl_io_fini(env, io);
1089 cl_env_put(env, &refcheck);
1094 * This function is used to make the extent prepared for transfer.
1095 * A race with flusing page - ll_writepage() has to be handled cautiously.
1097 static int osc_extent_make_ready(const struct lu_env *env,
1098 struct osc_extent *ext)
1100 struct osc_async_page *oap;
1101 struct osc_async_page *last = NULL;
1102 struct osc_object *obj = ext->oe_obj;
1103 unsigned int page_count = 0;
1107 /* we're going to grab page lock, so object lock must not be taken. */
1108 LASSERT(sanity_check(ext) == 0);
1109 /* in locking state, any process should not touch this extent. */
1110 EASSERT(ext->oe_state == OES_LOCKING, ext);
1111 EASSERT(ext->oe_owner != NULL, ext);
1113 OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
1115 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1117 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
1120 /* checking ASYNC_READY is race safe */
1121 if ((oap->oap_async_flags & ASYNC_READY) != 0)
1124 rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
1127 spin_lock(&oap->oap_lock);
1128 oap->oap_async_flags |= ASYNC_READY;
1129 spin_unlock(&oap->oap_lock);
1132 LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
1135 LASSERTF(0, "unknown return code: %d\n", rc);
1139 LASSERT(page_count == ext->oe_nr_pages);
1140 LASSERT(last != NULL);
1141 /* the last page is the only one we need to refresh its count by
1142 * the size of file. */
1143 if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
1144 int last_oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
1145 LASSERT(last_oap_count > 0);
1146 LASSERT(last->oap_page_off + last_oap_count <= PAGE_SIZE);
1147 last->oap_count = last_oap_count;
1148 spin_lock(&last->oap_lock);
1149 last->oap_async_flags |= ASYNC_COUNT_STABLE;
1150 spin_unlock(&last->oap_lock);
1153 /* for the rest of pages, we don't need to call osf_refresh_count()
1154 * because it's known they are not the last page */
1155 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1156 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
1157 oap->oap_count = PAGE_SIZE - oap->oap_page_off;
1158 spin_lock(&oap->oap_lock);
1159 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1160 spin_unlock(&oap->oap_lock);
1164 osc_object_lock(obj);
1165 osc_extent_state_set(ext, OES_RPC);
1166 osc_object_unlock(obj);
1167 /* get a refcount for RPC. */
1168 osc_extent_get(ext);
1174 * Quick and simple version of osc_extent_find(). This function is frequently
1175 * called to expand the extent for the same IO. To expand the extent, the
1176 * page index must be in the same or next chunk of ext->oe_end.
1178 static int osc_extent_expand(struct osc_extent *ext, pgoff_t index,
1179 unsigned int *grants)
1181 struct osc_object *obj = ext->oe_obj;
1182 struct client_obd *cli = osc_cli(obj);
1183 struct osc_extent *next;
1184 int ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
1185 pgoff_t chunk = index >> ppc_bits;
1188 unsigned int chunksize = 1 << cli->cl_chunkbits;
1192 LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
1193 osc_object_lock(obj);
1194 LASSERT(sanity_check_nolock(ext) == 0);
1195 end_chunk = ext->oe_end >> ppc_bits;
1196 if (chunk > end_chunk + 1)
1197 GOTO(out, rc = -ERANGE);
1199 if (end_chunk >= chunk)
1202 LASSERT(end_chunk + 1 == chunk);
1204 /* try to expand this extent to cover @index */
1205 end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
1207 /* don't go over the maximum extent size reported by server */
1208 if (end_index - ext->oe_start + 1 > cli->cl_max_extent_pages)
1209 GOTO(out, rc = -ERANGE);
1211 next = next_extent(ext);
1212 if (next != NULL && next->oe_start <= end_index)
1213 /* complex mode - overlapped with the next extent,
1214 * this case will be handled by osc_extent_find() */
1215 GOTO(out, rc = -EAGAIN);
1217 ext->oe_end = end_index;
1218 ext->oe_grants += chunksize;
1219 LASSERT(*grants >= chunksize);
1220 *grants -= chunksize;
1221 EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
1222 "overlapped after expanding for %lu.\n", index);
1226 osc_object_unlock(obj);
1230 static void osc_extent_tree_dump0(int mask, struct osc_object *obj,
1231 const char *func, int line)
1233 struct osc_extent *ext;
1236 if (!cfs_cdebug_show(mask, DEBUG_SUBSYSTEM))
1239 CDEBUG(mask, "Dump object %p extents at %s:%d, mppr: %u.\n",
1240 obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
1242 /* osc_object_lock(obj); */
1244 for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
1245 OSC_EXTENT_DUMP(mask, ext, "in tree %d.\n", cnt++);
1248 list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
1249 OSC_EXTENT_DUMP(mask, ext, "hp %d.\n", cnt++);
1252 list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
1253 OSC_EXTENT_DUMP(mask, ext, "urgent %d.\n", cnt++);
1256 list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
1257 OSC_EXTENT_DUMP(mask, ext, "reading %d.\n", cnt++);
1258 /* osc_object_unlock(obj); */
1261 /* ------------------ osc extent end ------------------ */
1263 static inline int osc_is_ready(struct osc_object *osc)
1265 return !list_empty(&osc->oo_ready_item) ||
1266 !list_empty(&osc->oo_hp_ready_item);
1269 #define OSC_IO_DEBUG(OSC, STR, args...) \
1270 CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
1271 (OSC), osc_is_ready(OSC), \
1272 list_empty_marker(&(OSC)->oo_hp_ready_item), \
1273 list_empty_marker(&(OSC)->oo_ready_item), \
1274 atomic_read(&(OSC)->oo_nr_writes), \
1275 list_empty_marker(&(OSC)->oo_hp_exts), \
1276 list_empty_marker(&(OSC)->oo_urgent_exts), \
1277 atomic_read(&(OSC)->oo_nr_reads), \
1278 list_empty_marker(&(OSC)->oo_reading_exts), \
1281 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
1284 struct osc_page *opg = oap2osc_page(oap);
1285 struct cl_page *page = oap2cl_page(oap);
1288 LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
1291 result = cl_page_make_ready(env, page, CRT_WRITE);
1293 opg->ops_submit_time = ktime_get();
1297 static int osc_refresh_count(const struct lu_env *env,
1298 struct osc_async_page *oap, int cmd)
1300 struct osc_page *opg = oap2osc_page(oap);
1301 pgoff_t index = osc_index(oap2osc(oap));
1302 struct cl_object *obj;
1303 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1307 /* readpage queues with _COUNT_STABLE, shouldn't get here. */
1308 LASSERT(!(cmd & OBD_BRW_READ));
1309 LASSERT(opg != NULL);
1310 obj = opg->ops_cl.cpl_obj;
1312 cl_object_attr_lock(obj);
1313 result = cl_object_attr_get(env, obj, attr);
1314 cl_object_attr_unlock(obj);
1317 kms = attr->cat_kms;
1318 if (cl_offset(obj, index) >= kms)
1319 /* catch race with truncate */
1321 else if (cl_offset(obj, index + 1) > kms)
1322 /* catch sub-page write at end of file */
1323 return kms & ~PAGE_MASK;
1328 static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
1331 struct osc_page *opg = oap2osc_page(oap);
1332 struct cl_page *page = oap2cl_page(oap);
1333 enum cl_req_type crt;
1338 cmd &= ~OBD_BRW_NOQUOTA;
1339 LASSERTF(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ),
1340 "cp_state:%u, cmd:%d\n", page->cp_state, cmd);
1341 LASSERTF(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE),
1342 "cp_state:%u, cmd:%d\n", page->cp_state, cmd);
1343 LASSERT(opg->ops_transfer_pinned);
1345 crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
1346 /* Clear opg->ops_transfer_pinned before VM lock is released. */
1347 opg->ops_transfer_pinned = 0;
1349 opg->ops_submit_time = ktime_set(0, 0);
1350 srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
1353 if (rc == 0 && srvlock) {
1354 struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
1355 struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
1356 size_t bytes = oap->oap_count;
1358 if (crt == CRT_READ)
1359 stats->os_lockless_reads += bytes;
1361 stats->os_lockless_writes += bytes;
1365 * This has to be the last operation with the page, as locks are
1366 * released in cl_page_completion() and nothing except for the
1367 * reference counter protects page from concurrent reclaim.
1369 lu_ref_del(&page->cp_reference, "transfer", page);
1371 cl_page_completion(env, page, crt, rc);
1372 cl_page_put(env, page);
1377 #define OSC_DUMP_GRANT(mask, cli, fmt, args...) do { \
1378 struct client_obd *__tmp = (cli); \
1379 CDEBUG(mask, "%s: grant { dirty: %ld/%ld dirty_pages: %ld/%lu " \
1380 "dropped: %ld avail: %ld, dirty_grant: %ld, " \
1381 "reserved: %ld, flight: %d } lru {in list: %ld, " \
1382 "left: %ld, waiters: %d }" fmt "\n", \
1384 __tmp->cl_dirty_pages, __tmp->cl_dirty_max_pages, \
1385 atomic_long_read(&obd_dirty_pages), obd_max_dirty_pages, \
1386 __tmp->cl_lost_grant, __tmp->cl_avail_grant, \
1387 __tmp->cl_dirty_grant, \
1388 __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, \
1389 atomic_long_read(&__tmp->cl_lru_in_list), \
1390 atomic_long_read(&__tmp->cl_lru_busy), \
1391 atomic_read(&__tmp->cl_lru_shrinkers), ##args); \
1394 /* caller must hold loi_list_lock */
1395 static void osc_consume_write_grant(struct client_obd *cli,
1396 struct brw_page *pga)
1398 assert_spin_locked(&cli->cl_loi_list_lock);
1399 LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
1400 cli->cl_dirty_pages++;
1401 pga->flag |= OBD_BRW_FROM_GRANT;
1402 CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
1403 PAGE_SIZE, pga, pga->pg);
1404 osc_update_next_shrink(cli);
1407 /* the companion to osc_consume_write_grant, called when a brw has completed.
1408 * must be called with the loi lock held. */
1409 static void osc_release_write_grant(struct client_obd *cli,
1410 struct brw_page *pga)
1414 assert_spin_locked(&cli->cl_loi_list_lock);
1415 if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
1420 pga->flag &= ~OBD_BRW_FROM_GRANT;
1421 atomic_long_dec(&obd_dirty_pages);
1422 cli->cl_dirty_pages--;
1427 * To avoid sleeping with object lock held, it's good for us allocate enough
1428 * grants before entering into critical section.
1430 * client_obd_list_lock held by caller
1432 static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
1436 if (cli->cl_avail_grant >= bytes) {
1437 cli->cl_avail_grant -= bytes;
1438 cli->cl_reserved_grant += bytes;
1444 static void __osc_unreserve_grant(struct client_obd *cli,
1445 unsigned int reserved, unsigned int unused)
1447 /* it's quite normal for us to get more grant than reserved.
1448 * Thinking about a case that two extents merged by adding a new
1449 * chunk, we can save one extent tax. If extent tax is greater than
1450 * one chunk, we can save more grant by adding a new chunk */
1451 cli->cl_reserved_grant -= reserved;
1452 if (unused > reserved) {
1453 cli->cl_avail_grant += reserved;
1454 cli->cl_lost_grant += unused - reserved;
1455 cli->cl_dirty_grant -= unused - reserved;
1457 cli->cl_avail_grant += unused;
1458 cli->cl_dirty_grant += reserved - unused;
1462 static void osc_unreserve_grant_nolock(struct client_obd *cli,
1463 unsigned int reserved,
1464 unsigned int unused)
1466 __osc_unreserve_grant(cli, reserved, unused);
1468 osc_wake_cache_waiters(cli);
1471 static void osc_unreserve_grant(struct client_obd *cli,
1472 unsigned int reserved, unsigned int unused)
1474 spin_lock(&cli->cl_loi_list_lock);
1475 osc_unreserve_grant_nolock(cli, reserved, unused);
1476 spin_unlock(&cli->cl_loi_list_lock);
1480 * Free grant after IO is finished or canceled.
1482 * @lost_grant is used to remember how many grants we have allocated but not
1483 * used, we should return these grants to OST. There're two cases where grants
1486 * 2. blocksize at OST is less than PAGE_SIZE and a partial page was
1487 * written. In this case OST may use less chunks to serve this partial
1488 * write. OSTs don't actually know the page size on the client side. so
1489 * clients have to calculate lost grant by the blocksize on the OST.
1490 * See filter_grant_check() for details.
1492 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
1493 unsigned int lost_grant, unsigned int dirty_grant)
1495 unsigned long grant;
1497 grant = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
1499 spin_lock(&cli->cl_loi_list_lock);
1500 atomic_long_sub(nr_pages, &obd_dirty_pages);
1501 cli->cl_dirty_pages -= nr_pages;
1502 cli->cl_lost_grant += lost_grant;
1503 cli->cl_dirty_grant -= dirty_grant;
1504 if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) {
1505 /* borrow some grant from truncate to avoid the case that
1506 * truncate uses up all avail grant */
1507 cli->cl_lost_grant -= grant;
1508 cli->cl_avail_grant += grant;
1510 osc_wake_cache_waiters(cli);
1511 spin_unlock(&cli->cl_loi_list_lock);
1512 CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu/%lu\n",
1513 lost_grant, cli->cl_lost_grant,
1514 cli->cl_avail_grant, cli->cl_dirty_pages << PAGE_SHIFT,
1515 cli->cl_dirty_grant);
1519 * The companion to osc_enter_cache(), called when @oap is no longer part of
1520 * the dirty accounting due to error.
1522 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
1524 spin_lock(&cli->cl_loi_list_lock);
1525 osc_release_write_grant(cli, &oap->oap_brw_page);
1526 spin_unlock(&cli->cl_loi_list_lock);
1530 * Non-blocking version of osc_enter_cache() that consumes grant only when it
1533 static int osc_enter_cache_try(struct client_obd *cli,
1534 struct osc_async_page *oap,
1539 OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
1541 rc = osc_reserve_grant(cli, bytes);
1545 if (cli->cl_dirty_pages < cli->cl_dirty_max_pages) {
1546 if (atomic_long_add_return(1, &obd_dirty_pages) <=
1547 obd_max_dirty_pages) {
1548 osc_consume_write_grant(cli, &oap->oap_brw_page);
1552 atomic_long_dec(&obd_dirty_pages);
1554 __osc_unreserve_grant(cli, bytes, bytes);
1560 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
1563 spin_lock(&cli->cl_loi_list_lock);
1564 rc = list_empty(&ocw->ocw_entry);
1565 spin_unlock(&cli->cl_loi_list_lock);
1570 * The main entry to reserve dirty page accounting. Usually the grant reserved
1571 * in this function will be freed in bulk in osc_free_grant() unless it fails
1572 * to add osc cache, in that case, it will be freed in osc_exit_cache().
1574 * The process will be put into sleep if it's already run out of grant.
1576 static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
1577 struct osc_async_page *oap, int bytes)
1579 struct osc_object *osc = oap->oap_obj;
1580 struct lov_oinfo *loi = osc->oo_oinfo;
1581 struct osc_cache_waiter ocw;
1585 OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
1587 spin_lock(&cli->cl_loi_list_lock);
1589 /* force the caller to try sync io. this can jump the list
1590 * of queued writes and create a discontiguous rpc stream */
1591 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
1592 cli->cl_dirty_max_pages == 0 ||
1593 cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) {
1594 OSC_DUMP_GRANT(D_CACHE, cli, "forced sync i/o\n");
1595 GOTO(out, rc = -EDQUOT);
1598 /* Hopefully normal case - cache space and write credits available */
1599 if (list_empty(&cli->cl_cache_waiters) &&
1600 osc_enter_cache_try(cli, oap, bytes)) {
1601 OSC_DUMP_GRANT(D_CACHE, cli, "granted from cache\n");
1605 /* We can get here for two reasons: too many dirty pages in cache, or
1606 * run out of grants. In both cases we should write dirty pages out.
1607 * Adding a cache waiter will trigger urgent write-out no matter what
1609 * The exiting condition is no avail grants and no dirty pages caching,
1610 * that really means there is no space on the OST. */
1611 init_waitqueue_head(&ocw.ocw_waitq);
1613 ocw.ocw_grant = bytes;
1614 while (cli->cl_dirty_pages > 0 || cli->cl_w_in_flight > 0) {
1615 list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
1617 spin_unlock(&cli->cl_loi_list_lock);
1619 osc_io_unplug_async(env, cli, NULL);
1621 CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
1622 cli_name(cli), &ocw, oap);
1624 rc = wait_event_idle_timeout(ocw.ocw_waitq,
1625 ocw_granted(cli, &ocw),
1626 cfs_time_seconds(AT_OFF ?
1630 spin_lock(&cli->cl_loi_list_lock);
1633 /* l_wait_event is interrupted by signal or timed out */
1634 list_del_init(&ocw.ocw_entry);
1639 LASSERT(list_empty(&ocw.ocw_entry));
1644 if (osc_enter_cache_try(cli, oap, bytes)) {
1652 OSC_DUMP_GRANT(D_CACHE, cli, "finally got grant space\n");
1655 OSC_DUMP_GRANT(D_CACHE, cli,
1656 "timeout, fall back to sync i/o\n");
1657 osc_extent_tree_dump(D_CACHE, osc);
1658 /* fall back to synchronous I/O */
1662 /* Ensures restartability - LU-3581 */
1663 OSC_DUMP_GRANT(D_CACHE, cli, "interrupted\n");
1667 OSC_DUMP_GRANT(D_CACHE, cli,
1668 "no grant space, fall back to sync i/o\n");
1671 CDEBUG(D_CACHE, "%s: event for cache space @ %p never arrived "
1672 "due to %d, fall back to sync i/o\n",
1673 cli_name(cli), &ocw, rc);
1678 spin_unlock(&cli->cl_loi_list_lock);
1682 /* caller must hold loi_list_lock */
1683 void osc_wake_cache_waiters(struct client_obd *cli)
1685 struct list_head *l, *tmp;
1686 struct osc_cache_waiter *ocw;
1689 list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
1690 ocw = list_entry(l, struct osc_cache_waiter, ocw_entry);
1692 ocw->ocw_rc = -EDQUOT;
1694 if (osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant))
1697 if (ocw->ocw_rc == 0 ||
1698 !(cli->cl_dirty_pages > 0 || cli->cl_w_in_flight > 0)) {
1699 list_del_init(&ocw->ocw_entry);
1700 CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant "
1701 "%ld, %d\n", ocw, ocw->ocw_oap,
1702 cli->cl_avail_grant, ocw->ocw_rc);
1704 wake_up(&ocw->ocw_waitq);
1710 EXPORT_SYMBOL(osc_wake_cache_waiters);
1712 static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
1714 int hprpc = !!list_empty(&osc->oo_hp_exts);
1715 return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
1718 /* This maintains the lists of pending pages to read/write for a given object
1719 * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
1720 * to quickly find objects that are ready to send an RPC. */
1721 static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
1724 int invalid_import = 0;
1727 /* if we have an invalid import we want to drain the queued pages
1728 * by forcing them through rpcs that immediately fail and complete
1729 * the pages. recovery relies on this to empty the queued pages
1730 * before canceling the locks and evicting down the llite pages */
1731 if ((cli->cl_import == NULL || cli->cl_import->imp_invalid))
1734 if (cmd & OBD_BRW_WRITE) {
1735 if (atomic_read(&osc->oo_nr_writes) == 0)
1737 if (invalid_import) {
1738 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1741 if (!list_empty(&osc->oo_hp_exts)) {
1742 CDEBUG(D_CACHE, "high prio request forcing RPC\n");
1745 if (!list_empty(&osc->oo_urgent_exts)) {
1746 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1749 /* trigger a write rpc stream as long as there are dirtiers
1750 * waiting for space. as they're waiting, they're not going to
1751 * create more pages to coalesce with what's waiting.. */
1752 if (!list_empty(&cli->cl_cache_waiters)) {
1753 CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1756 if (!list_empty(&osc->oo_full_exts)) {
1757 CDEBUG(D_CACHE, "full extent ready, make an RPC\n");
1761 if (atomic_read(&osc->oo_nr_reads) == 0)
1763 if (invalid_import) {
1764 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1767 /* all read are urgent. */
1768 if (!list_empty(&osc->oo_reading_exts))
1775 static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
1777 struct client_obd *cli = osc_cli(obj);
1778 if (cmd & OBD_BRW_WRITE) {
1779 atomic_add(delta, &obj->oo_nr_writes);
1780 atomic_add(delta, &cli->cl_pending_w_pages);
1781 LASSERT(atomic_read(&obj->oo_nr_writes) >= 0);
1783 atomic_add(delta, &obj->oo_nr_reads);
1784 atomic_add(delta, &cli->cl_pending_r_pages);
1785 LASSERT(atomic_read(&obj->oo_nr_reads) >= 0);
1787 OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
1790 static int osc_makes_hprpc(struct osc_object *obj)
1792 return !list_empty(&obj->oo_hp_exts);
1795 static void on_list(struct list_head *item, struct list_head *list,
1798 if (list_empty(item) && should_be_on)
1799 list_add_tail(item, list);
1800 else if (!list_empty(item) && !should_be_on)
1801 list_del_init(item);
1804 /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
1805 * can find pages to build into rpcs quickly */
1806 static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1808 if (osc_makes_hprpc(osc)) {
1810 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
1811 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
1813 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
1814 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
1815 osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
1816 osc_makes_rpc(cli, osc, OBD_BRW_READ));
1819 on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
1820 atomic_read(&osc->oo_nr_writes) > 0);
1822 on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
1823 atomic_read(&osc->oo_nr_reads) > 0);
1825 return osc_is_ready(osc);
1828 static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1832 spin_lock(&cli->cl_loi_list_lock);
1833 is_ready = __osc_list_maint(cli, osc);
1834 spin_unlock(&cli->cl_loi_list_lock);
1839 /* this is trying to propogate async writeback errors back up to the
1840 * application. As an async write fails we record the error code for later if
1841 * the app does an fsync. As long as errors persist we force future rpcs to be
1842 * sync so that the app can get a sync error and break the cycle of queueing
1843 * pages for which writeback will fail. */
1844 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
1851 ar->ar_force_sync = 1;
1852 ar->ar_min_xid = ptlrpc_sample_next_xid();
1857 if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
1858 ar->ar_force_sync = 0;
1861 /* this must be called holding the loi list lock to give coverage to exit_cache,
1862 * async_flag maintenance, and oap_request */
1863 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
1864 struct osc_async_page *oap, int sent, int rc)
1866 struct osc_object *osc = oap->oap_obj;
1867 struct lov_oinfo *loi = osc->oo_oinfo;
1871 if (oap->oap_request != NULL) {
1872 xid = ptlrpc_req_xid(oap->oap_request);
1873 ptlrpc_req_finished(oap->oap_request);
1874 oap->oap_request = NULL;
1877 /* As the transfer for this page is being done, clear the flags */
1878 spin_lock(&oap->oap_lock);
1879 oap->oap_async_flags = 0;
1880 spin_unlock(&oap->oap_lock);
1882 if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
1883 spin_lock(&cli->cl_loi_list_lock);
1884 osc_process_ar(&cli->cl_ar, xid, rc);
1885 osc_process_ar(&loi->loi_ar, xid, rc);
1886 spin_unlock(&cli->cl_loi_list_lock);
1889 rc = osc_completion(env, oap, oap->oap_cmd, rc);
1891 CERROR("completion on oap %p obj %p returns %d.\n",
1897 struct extent_rpc_data {
1898 struct list_head *erd_rpc_list;
1899 unsigned int erd_page_count;
1900 unsigned int erd_max_pages;
1901 unsigned int erd_max_chunks;
1902 unsigned int erd_max_extents;
1905 static inline unsigned osc_extent_chunks(const struct osc_extent *ext)
1907 struct client_obd *cli = osc_cli(ext->oe_obj);
1908 unsigned ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
1910 return (ext->oe_end >> ppc_bits) - (ext->oe_start >> ppc_bits) + 1;
1914 can_merge(const struct osc_extent *ext, const struct osc_extent *in_rpc)
1916 if (ext->oe_no_merge || in_rpc->oe_no_merge)
1919 if (ext->oe_srvlock != in_rpc->oe_srvlock)
1922 if (ext->oe_ndelay != in_rpc->oe_ndelay)
1925 if (!ext->oe_grants != !in_rpc->oe_grants)
1928 if (ext->oe_dio != in_rpc->oe_dio)
1931 /* It's possible to have overlap on DIO */
1932 if (in_rpc->oe_dio && overlapped(ext, in_rpc))
1939 * Try to add extent to one RPC. We need to think about the following things:
1940 * - # of pages must not be over max_pages_per_rpc
1941 * - extent must be compatible with previous ones
1943 static int try_to_add_extent_for_io(struct client_obd *cli,
1944 struct osc_extent *ext,
1945 struct extent_rpc_data *data)
1947 struct osc_extent *tmp;
1948 unsigned int chunk_count;
1951 EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
1953 OSC_EXTENT_DUMP(D_CACHE, ext, "trying to add this extent\n");
1955 if (data->erd_max_extents == 0)
1958 chunk_count = osc_extent_chunks(ext);
1959 EASSERTF(data->erd_page_count != 0 ||
1960 chunk_count <= data->erd_max_chunks, ext,
1961 "The first extent to be fit in a RPC contains %u chunks, "
1962 "which is over the limit %u.\n", chunk_count,
1963 data->erd_max_chunks);
1964 if (chunk_count > data->erd_max_chunks)
1967 data->erd_max_pages = max(ext->oe_mppr, data->erd_max_pages);
1968 EASSERTF(data->erd_page_count != 0 ||
1969 ext->oe_nr_pages <= data->erd_max_pages, ext,
1970 "The first extent to be fit in a RPC contains %u pages, "
1971 "which is over the limit %u.\n", ext->oe_nr_pages,
1972 data->erd_max_pages);
1973 if (data->erd_page_count + ext->oe_nr_pages > data->erd_max_pages)
1976 list_for_each_entry(tmp, data->erd_rpc_list, oe_link) {
1977 EASSERT(tmp->oe_owner == current, tmp);
1979 if (!can_merge(ext, tmp))
1983 data->erd_max_extents--;
1984 data->erd_max_chunks -= chunk_count;
1985 data->erd_page_count += ext->oe_nr_pages;
1986 list_move_tail(&ext->oe_link, data->erd_rpc_list);
1987 ext->oe_owner = current;
1992 * In order to prevent multiple ptlrpcd from breaking contiguous extents,
1993 * get_write_extent() takes all appropriate extents in atomic.
1995 * The following policy is used to collect extents for IO:
1996 * 1. Add as many HP extents as possible;
1997 * 2. Add the first urgent extent in urgent extent list and take it out of
1999 * 3. Add subsequent extents of this urgent extent;
2000 * 4. If urgent list is not empty, goto 2;
2001 * 5. Traverse the extent tree from the 1st extent;
2002 * 6. Above steps exit if there is no space in this RPC.
2004 static unsigned int get_write_extents(struct osc_object *obj,
2005 struct list_head *rpclist)
2007 struct client_obd *cli = osc_cli(obj);
2008 struct osc_extent *ext;
2009 struct extent_rpc_data data = {
2010 .erd_rpc_list = rpclist,
2011 .erd_page_count = 0,
2012 .erd_max_pages = cli->cl_max_pages_per_rpc,
2013 .erd_max_chunks = osc_max_write_chunks(cli),
2014 .erd_max_extents = 256,
2017 assert_osc_object_is_locked(obj);
2018 while (!list_empty(&obj->oo_hp_exts)) {
2019 ext = list_entry(obj->oo_hp_exts.next, struct osc_extent,
2021 LASSERT(ext->oe_state == OES_CACHE);
2022 if (!try_to_add_extent_for_io(cli, ext, &data))
2023 return data.erd_page_count;
2024 EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
2026 if (data.erd_page_count == data.erd_max_pages)
2027 return data.erd_page_count;
2029 while (!list_empty(&obj->oo_urgent_exts)) {
2030 ext = list_entry(obj->oo_urgent_exts.next,
2031 struct osc_extent, oe_link);
2032 if (!try_to_add_extent_for_io(cli, ext, &data))
2033 return data.erd_page_count;
2035 if (data.erd_page_count == data.erd_max_pages)
2036 return data.erd_page_count;
2038 /* One key difference between full extents and other extents: full
2039 * extents can usually only be added if the rpclist was empty, so if we
2040 * can't add one, we continue on to trying to add normal extents. This
2041 * is so we don't miss adding extra extents to an RPC containing high
2042 * priority or urgent extents. */
2043 while (!list_empty(&obj->oo_full_exts)) {
2044 ext = list_entry(obj->oo_full_exts.next,
2045 struct osc_extent, oe_link);
2046 if (!try_to_add_extent_for_io(cli, ext, &data))
2049 if (data.erd_page_count == data.erd_max_pages)
2050 return data.erd_page_count;
2052 ext = first_extent(obj);
2053 while (ext != NULL) {
2054 if ((ext->oe_state != OES_CACHE) ||
2055 /* this extent may be already in current rpclist */
2056 (!list_empty(&ext->oe_link) && ext->oe_owner != NULL)) {
2057 ext = next_extent(ext);
2061 if (!try_to_add_extent_for_io(cli, ext, &data))
2062 return data.erd_page_count;
2064 ext = next_extent(ext);
2066 return data.erd_page_count;
2070 osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
2071 struct osc_object *osc)
2075 struct osc_extent *ext;
2076 struct osc_extent *tmp;
2077 struct osc_extent *first = NULL;
2078 unsigned int page_count = 0;
2083 assert_osc_object_is_locked(osc);
2085 page_count = get_write_extents(osc, &rpclist);
2086 LASSERT(equi(page_count == 0, list_empty(&rpclist)));
2088 if (list_empty(&rpclist))
2091 osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
2093 list_for_each_entry(ext, &rpclist, oe_link) {
2094 LASSERT(ext->oe_state == OES_CACHE ||
2095 ext->oe_state == OES_LOCK_DONE);
2096 if (ext->oe_state == OES_CACHE)
2097 osc_extent_state_set(ext, OES_LOCKING);
2099 osc_extent_state_set(ext, OES_RPC);
2102 /* we're going to grab page lock, so release object lock because
2103 * lock order is page lock -> object lock. */
2104 osc_object_unlock(osc);
2106 list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
2107 if (ext->oe_state == OES_LOCKING) {
2108 rc = osc_extent_make_ready(env, ext);
2109 if (unlikely(rc < 0)) {
2110 list_del_init(&ext->oe_link);
2111 osc_extent_finish(env, ext, 0, rc);
2115 if (first == NULL) {
2117 srvlock = ext->oe_srvlock;
2119 LASSERT(srvlock == ext->oe_srvlock);
2123 if (!list_empty(&rpclist)) {
2124 LASSERT(page_count > 0);
2125 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE);
2126 LASSERT(list_empty(&rpclist));
2129 osc_object_lock(osc);
2134 * prepare pages for ASYNC io and put pages in send queue.
2136 * \param cmd OBD_BRW_* macroses
2137 * \param lop pending pages
2139 * \return zero if no page added to send queue.
2140 * \return 1 if pages successfully added to send queue.
2141 * \return negative on errors.
2144 osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
2145 struct osc_object *osc)
2148 struct osc_extent *ext;
2149 struct osc_extent *next;
2151 struct extent_rpc_data data = {
2152 .erd_rpc_list = &rpclist,
2153 .erd_page_count = 0,
2154 .erd_max_pages = cli->cl_max_pages_per_rpc,
2155 .erd_max_chunks = UINT_MAX,
2156 .erd_max_extents = UINT_MAX,
2161 assert_osc_object_is_locked(osc);
2162 list_for_each_entry_safe(ext, next, &osc->oo_reading_exts, oe_link) {
2163 EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
2164 if (!try_to_add_extent_for_io(cli, ext, &data))
2166 osc_extent_state_set(ext, OES_RPC);
2167 EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
2169 LASSERT(data.erd_page_count <= data.erd_max_pages);
2171 osc_update_pending(osc, OBD_BRW_READ, -data.erd_page_count);
2173 if (!list_empty(&rpclist)) {
2174 osc_object_unlock(osc);
2176 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ);
2177 LASSERT(list_empty(&rpclist));
2179 osc_object_lock(osc);
2184 #define list_to_obj(list, item) ({ \
2185 struct list_head *__tmp = (list)->next; \
2186 list_del_init(__tmp); \
2187 list_entry(__tmp, struct osc_object, oo_##item); \
2190 /* This is called by osc_check_rpcs() to find which objects have pages that
2191 * we could be sending. These lists are maintained by osc_makes_rpc(). */
2192 static struct osc_object *osc_next_obj(struct client_obd *cli)
2196 /* First return objects that have blocked locks so that they
2197 * will be flushed quickly and other clients can get the lock,
2198 * then objects which have pages ready to be stuffed into RPCs */
2199 if (!list_empty(&cli->cl_loi_hp_ready_list))
2200 RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
2201 if (!list_empty(&cli->cl_loi_ready_list))
2202 RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
2204 /* then if we have cache waiters, return all objects with queued
2205 * writes. This is especially important when many small files
2206 * have filled up the cache and not been fired into rpcs because
2207 * they don't pass the nr_pending/object threshhold */
2208 if (!list_empty(&cli->cl_cache_waiters) &&
2209 !list_empty(&cli->cl_loi_write_list))
2210 RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
2212 /* then return all queued objects when we have an invalid import
2213 * so that they get flushed */
2214 if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2215 if (!list_empty(&cli->cl_loi_write_list))
2216 RETURN(list_to_obj(&cli->cl_loi_write_list,
2218 if (!list_empty(&cli->cl_loi_read_list))
2219 RETURN(list_to_obj(&cli->cl_loi_read_list,
2225 /* called with the loi list lock held */
2226 static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2227 __must_hold(&cli->cl_loi_list_lock)
2229 struct osc_object *osc;
2233 while ((osc = osc_next_obj(cli)) != NULL) {
2234 struct cl_object *obj = osc2cl(osc);
2235 struct lu_ref_link link;
2237 OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
2239 if (osc_max_rpc_in_flight(cli, osc)) {
2240 __osc_list_maint(cli, osc);
2245 spin_unlock(&cli->cl_loi_list_lock);
2246 lu_object_ref_add_at(&obj->co_lu, &link, "check", current);
2248 /* attempt some read/write balancing by alternating between
2249 * reads and writes in an object. The makes_rpc checks here
2250 * would be redundant if we were getting read/write work items
2251 * instead of objects. we don't want send_oap_rpc to drain a
2252 * partial read pending queue when we're given this object to
2253 * do io on writes while there are cache waiters */
2254 osc_object_lock(osc);
2255 if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
2256 rc = osc_send_write_rpc(env, cli, osc);
2258 CERROR("Write request failed with %d\n", rc);
2260 /* osc_send_write_rpc failed, mostly because of
2263 * It can't break here, because if:
2264 * - a page was submitted by osc_io_submit, so
2266 * - no request in flight
2267 * - no subsequent request
2268 * The system will be in live-lock state,
2269 * because there is no chance to call
2270 * osc_io_unplug() and osc_check_rpcs() any
2271 * more. pdflush can't help in this case,
2272 * because it might be blocked at grabbing
2273 * the page lock as we mentioned.
2275 * Anyway, continue to drain pages. */
2279 if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
2280 rc = osc_send_read_rpc(env, cli, osc);
2282 CERROR("Read request failed with %d\n", rc);
2284 osc_object_unlock(osc);
2286 osc_list_maint(cli, osc);
2287 lu_object_ref_del_at(&obj->co_lu, &link, "check", current);
2288 cl_object_put(env, obj);
2290 spin_lock(&cli->cl_loi_list_lock);
2294 int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
2295 struct osc_object *osc, int async)
2299 if (osc != NULL && osc_list_maint(cli, osc) == 0)
2303 spin_lock(&cli->cl_loi_list_lock);
2304 osc_check_rpcs(env, cli);
2305 spin_unlock(&cli->cl_loi_list_lock);
2307 CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli);
2308 LASSERT(cli->cl_writeback_work != NULL);
2309 rc = ptlrpcd_queue_work(cli->cl_writeback_work);
2313 EXPORT_SYMBOL(osc_io_unplug0);
2315 int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
2316 struct page *page, loff_t offset)
2318 struct obd_export *exp = osc_export(osc);
2319 struct osc_async_page *oap = &ops->ops_oap;
2323 return cfs_size_round(sizeof(*oap));
2325 oap->oap_magic = OAP_MAGIC;
2326 oap->oap_cli = &exp->exp_obd->u.cli;
2329 oap->oap_page = page;
2330 oap->oap_obj_off = offset;
2331 LASSERT(!(offset & ~PAGE_MASK));
2333 INIT_LIST_HEAD(&oap->oap_pending_item);
2334 INIT_LIST_HEAD(&oap->oap_rpc_item);
2336 spin_lock_init(&oap->oap_lock);
2337 CDEBUG(D_INFO, "oap %p page %p obj off %llu\n",
2338 oap, page, oap->oap_obj_off);
2341 EXPORT_SYMBOL(osc_prep_async_page);
2343 int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
2344 struct osc_page *ops, cl_commit_cbt cb)
2346 struct osc_io *oio = osc_env_io(env);
2347 struct osc_extent *ext = NULL;
2348 struct osc_async_page *oap = &ops->ops_oap;
2349 struct client_obd *cli = oap->oap_cli;
2350 struct osc_object *osc = oap->oap_obj;
2351 struct pagevec *pvec = &osc_env_info(env)->oti_pagevec;
2354 unsigned int grants = 0;
2355 u32 brw_flags = OBD_BRW_ASYNC;
2356 int cmd = OBD_BRW_WRITE;
2357 int need_release = 0;
2361 if (oap->oap_magic != OAP_MAGIC)
2364 if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2367 if (!list_empty(&oap->oap_pending_item) ||
2368 !list_empty(&oap->oap_rpc_item))
2371 /* Set the OBD_BRW_SRVLOCK before the page is queued. */
2372 brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
2373 if (oio->oi_cap_sys_resource || io->ci_noquota) {
2374 brw_flags |= OBD_BRW_NOQUOTA;
2375 cmd |= OBD_BRW_NOQUOTA;
2378 /* check if the file's owner/group is over quota */
2379 if (!(cmd & OBD_BRW_NOQUOTA)) {
2380 struct cl_object *obj;
2381 struct cl_attr *attr;
2382 unsigned int qid[LL_MAXQUOTAS];
2384 obj = cl_object_top(&osc->oo_cl);
2385 attr = &osc_env_info(env)->oti_attr;
2387 cl_object_attr_lock(obj);
2388 rc = cl_object_attr_get(env, obj, attr);
2389 cl_object_attr_unlock(obj);
2391 qid[USRQUOTA] = attr->cat_uid;
2392 qid[GRPQUOTA] = attr->cat_gid;
2393 qid[PRJQUOTA] = attr->cat_projid;
2394 if (rc == 0 && osc_quota_chkdq(cli, qid) == -EDQUOT)
2401 oap->oap_page_off = ops->ops_from;
2402 oap->oap_count = ops->ops_to - ops->ops_from;
2403 /* No need to hold a lock here,
2404 * since this page is not in any list yet. */
2405 oap->oap_async_flags = 0;
2406 oap->oap_brw_flags = brw_flags;
2408 OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
2409 oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
2411 index = osc_index(oap2osc(oap));
2413 /* Add this page into extent by the following steps:
2414 * 1. if there exists an active extent for this IO, mostly this page
2415 * can be added to the active extent and sometimes we need to
2416 * expand extent to accomodate this page;
2417 * 2. otherwise, a new extent will be allocated. */
2419 ext = oio->oi_active;
2420 if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) {
2421 /* one chunk plus extent overhead must be enough to write this
2423 grants = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
2424 if (ext->oe_end >= index)
2427 /* it doesn't need any grant to dirty this page */
2428 spin_lock(&cli->cl_loi_list_lock);
2429 rc = osc_enter_cache_try(cli, oap, grants);
2430 if (rc == 0) { /* try failed */
2433 } else if (ext->oe_end < index) {
2435 /* try to expand this extent */
2436 rc = osc_extent_expand(ext, index, &tmp);
2439 /* don't free reserved grant */
2441 OSC_EXTENT_DUMP(D_CACHE, ext,
2442 "expanded for %lu.\n", index);
2443 osc_unreserve_grant_nolock(cli, grants, tmp);
2447 spin_unlock(&cli->cl_loi_list_lock);
2449 } else if (ext != NULL) {
2450 /* index is located outside of active extent */
2454 osc_extent_release(env, ext);
2455 oio->oi_active = NULL;
2460 tmp = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
2462 /* try to find new extent to cover this page */
2463 LASSERT(oio->oi_active == NULL);
2464 /* we may have allocated grant for this page if we failed
2465 * to expand the previous active extent. */
2466 LASSERT(ergo(grants > 0, grants >= tmp));
2470 /* We haven't allocated grant for this page, and we
2471 * must not hold a page lock while we do enter_cache,
2472 * so we must mark dirty & unlock any pages in the
2473 * write commit pagevec. */
2474 if (pagevec_count(pvec)) {
2476 pagevec_reinit(pvec);
2478 rc = osc_enter_cache(env, cli, oap, tmp);
2485 ext = osc_extent_find(env, osc, index, &tmp);
2487 LASSERT(tmp == grants);
2488 osc_exit_cache(cli, oap);
2492 oio->oi_active = ext;
2496 osc_unreserve_grant(cli, grants, tmp);
2499 LASSERT(ergo(rc == 0, ext != NULL));
2501 EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
2502 ext, "index = %lu.\n", index);
2503 LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
2505 osc_object_lock(osc);
2506 if (ext->oe_nr_pages == 0)
2507 ext->oe_srvlock = ops->ops_srvlock;
2509 LASSERT(ext->oe_srvlock == ops->ops_srvlock);
2511 list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
2512 osc_object_unlock(osc);
2514 if (!ext->oe_layout_version)
2515 ext->oe_layout_version = io->ci_layout_version;
2521 int osc_teardown_async_page(const struct lu_env *env,
2522 struct osc_object *obj, struct osc_page *ops)
2524 struct osc_async_page *oap = &ops->ops_oap;
2528 LASSERT(oap->oap_magic == OAP_MAGIC);
2530 CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
2531 oap, ops, osc_index(oap2osc(oap)));
2533 if (!list_empty(&oap->oap_rpc_item)) {
2534 CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
2536 } else if (!list_empty(&oap->oap_pending_item)) {
2537 struct osc_extent *ext = NULL;
2539 osc_object_lock(obj);
2540 ext = osc_extent_lookup(obj, osc_index(oap2osc(oap)));
2541 osc_object_unlock(obj);
2542 /* only truncated pages are allowed to be taken out.
2543 * See osc_extent_truncate() and osc_cache_truncate_start()
2545 if (ext != NULL && ext->oe_state != OES_TRUNC) {
2546 OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
2547 osc_index(oap2osc(oap)));
2551 osc_extent_put(env, ext);
2557 * This is called when a page is picked up by kernel to write out.
2559 * We should find out the corresponding extent and add the whole extent
2560 * into urgent list. The extent may be being truncated or used, handle it
2563 int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
2564 struct osc_page *ops)
2566 struct osc_extent *ext = NULL;
2567 struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
2568 struct cl_page *cp = ops->ops_cl.cpl_page;
2569 pgoff_t index = osc_index(ops);
2570 struct osc_async_page *oap = &ops->ops_oap;
2571 bool unplug = false;
2575 osc_object_lock(obj);
2576 ext = osc_extent_lookup(obj, index);
2578 osc_extent_tree_dump(D_ERROR, obj);
2579 LASSERTF(0, "page index %lu is NOT covered.\n", index);
2582 switch (ext->oe_state) {
2585 CL_PAGE_DEBUG(D_ERROR, env, cp, "flush an in-rpc page?\n");
2589 /* If we know this extent is being written out, we should abort
2590 * so that the writer can make this page ready. Otherwise, there
2591 * exists a deadlock problem because other process can wait for
2592 * page writeback bit holding page lock; and meanwhile in
2593 * vvp_page_make_ready(), we need to grab page lock before
2594 * really sending the RPC. */
2596 /* race with truncate, page will be redirtied */
2598 /* The extent is active so we need to abort and let the caller
2599 * re-dirty the page. If we continued on here, and we were the
2600 * one making the extent active, we could deadlock waiting for
2601 * the page writeback to clear but it won't because the extent
2602 * is active and won't be written out. */
2603 GOTO(out, rc = -EAGAIN);
2608 rc = cl_page_prep(env, io, cp, CRT_WRITE);
2612 spin_lock(&oap->oap_lock);
2613 oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
2614 spin_unlock(&oap->oap_lock);
2616 if (memory_pressure_get())
2617 ext->oe_memalloc = 1;
2620 if (ext->oe_state == OES_CACHE) {
2621 OSC_EXTENT_DUMP(D_CACHE, ext,
2622 "flush page %p make it urgent.\n", oap);
2623 if (list_empty(&ext->oe_link))
2624 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2631 osc_object_unlock(obj);
2632 osc_extent_put(env, ext);
2634 osc_io_unplug_async(env, osc_cli(obj), obj);
2638 int osc_queue_sync_pages(const struct lu_env *env, const struct cl_io *io,
2639 struct osc_object *obj, struct list_head *list,
2642 struct client_obd *cli = osc_cli(obj);
2643 struct osc_extent *ext;
2644 struct osc_async_page *oap;
2646 int mppr = cli->cl_max_pages_per_rpc;
2647 bool can_merge = true;
2648 pgoff_t start = CL_PAGE_EOF;
2652 list_for_each_entry(oap, list, oap_pending_item) {
2653 struct osc_page *opg = oap2osc_page(oap);
2654 pgoff_t index = osc_index(opg);
2661 mppr <<= (page_count > mppr);
2663 if (unlikely(opg->ops_from > 0 || opg->ops_to < PAGE_SIZE))
2667 ext = osc_extent_alloc(obj);
2669 struct osc_async_page *tmp;
2671 list_for_each_entry_safe(oap, tmp, list, oap_pending_item) {
2672 list_del_init(&oap->oap_pending_item);
2673 osc_ap_completion(env, cli, oap, 0, -ENOMEM);
2678 ext->oe_rw = !!(brw_flags & OBD_BRW_READ);
2680 ext->oe_no_merge = !can_merge;
2682 ext->oe_start = start;
2683 ext->oe_end = ext->oe_max_end = end;
2685 ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
2686 ext->oe_ndelay = !!(brw_flags & OBD_BRW_NDELAY);
2687 ext->oe_dio = !!(brw_flags & OBD_BRW_NOCACHE);
2688 ext->oe_nr_pages = page_count;
2689 ext->oe_mppr = mppr;
2690 list_splice_init(list, &ext->oe_pages);
2691 ext->oe_layout_version = io->ci_layout_version;
2693 osc_object_lock(obj);
2694 /* Reuse the initial refcount for RPC, don't drop it */
2695 osc_extent_state_set(ext, OES_LOCK_DONE);
2696 if (!ext->oe_rw) { /* write */
2697 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2698 osc_update_pending(obj, OBD_BRW_WRITE, page_count);
2700 list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
2701 osc_update_pending(obj, OBD_BRW_READ, page_count);
2703 osc_object_unlock(obj);
2705 osc_io_unplug_async(env, cli, obj);
2710 * Called by osc_io_setattr_start() to freeze and destroy covering extents.
2712 int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
2713 __u64 size, struct osc_extent **extp)
2715 struct client_obd *cli = osc_cli(obj);
2716 struct osc_extent *ext;
2717 struct osc_extent *waiting = NULL;
2724 /* pages with index greater or equal to index will be truncated. */
2725 index = cl_index(osc2cl(obj), size);
2726 partial = size > cl_offset(osc2cl(obj), index);
2729 osc_object_lock(obj);
2730 ext = osc_extent_search(obj, index);
2732 ext = first_extent(obj);
2733 else if (ext->oe_end < index)
2734 ext = next_extent(ext);
2735 while (ext != NULL) {
2736 EASSERT(ext->oe_state != OES_TRUNC, ext);
2738 if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
2739 /* if ext is in urgent state, it means there must exist
2740 * a page already having been flushed by write_page().
2741 * We have to wait for this extent because we can't
2742 * truncate that page. */
2743 OSC_EXTENT_DUMP(D_CACHE, ext,
2744 "waiting for busy extent\n");
2745 waiting = osc_extent_get(ext);
2749 OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:%llu.\n", size);
2751 osc_extent_get(ext);
2752 if (ext->oe_state == OES_ACTIVE) {
2753 /* though we grab inode mutex for write path, but we
2754 * release it before releasing extent(in osc_io_end()),
2755 * so there is a race window that an extent is still
2756 * in OES_ACTIVE when truncate starts. */
2757 LASSERT(!ext->oe_trunc_pending);
2758 ext->oe_trunc_pending = 1;
2760 EASSERT(ext->oe_state == OES_CACHE, ext);
2761 osc_extent_state_set(ext, OES_TRUNC);
2762 osc_update_pending(obj, OBD_BRW_WRITE,
2765 /* This extent could be on the full extents list, that's OK */
2766 EASSERT(!ext->oe_hp && !ext->oe_urgent, ext);
2767 if (!list_empty(&ext->oe_link))
2768 list_move_tail(&ext->oe_link, &list);
2770 list_add_tail(&ext->oe_link, &list);
2772 ext = next_extent(ext);
2774 osc_object_unlock(obj);
2776 osc_list_maint(cli, obj);
2778 while (!list_empty(&list)) {
2781 ext = list_entry(list.next, struct osc_extent, oe_link);
2782 list_del_init(&ext->oe_link);
2784 /* extent may be in OES_ACTIVE state because inode mutex
2785 * is released before osc_io_end() in file write case */
2786 if (ext->oe_state != OES_TRUNC)
2787 osc_extent_wait(env, ext, OES_TRUNC);
2789 rc = osc_extent_truncate(ext, index, partial);
2794 OSC_EXTENT_DUMP(D_ERROR, ext,
2795 "truncate error %d\n", rc);
2796 } else if (ext->oe_nr_pages == 0) {
2797 osc_extent_remove(ext);
2799 /* this must be an overlapped extent which means only
2800 * part of pages in this extent have been truncated.
2802 EASSERTF(ext->oe_start <= index, ext,
2803 "trunc index = %lu/%d.\n", index, partial);
2804 /* fix index to skip this partially truncated extent */
2805 index = ext->oe_end + 1;
2808 /* we need to hold this extent in OES_TRUNC state so
2809 * that no writeback will happen. This is to avoid
2811 * Only partial truncate can reach here, if @size is
2812 * not zero, the caller should provide a valid @extp. */
2813 LASSERT(*extp == NULL);
2814 *extp = osc_extent_get(ext);
2815 OSC_EXTENT_DUMP(D_CACHE, ext,
2816 "trunc at %llu\n", size);
2818 osc_extent_put(env, ext);
2820 if (waiting != NULL) {
2823 /* ignore the result of osc_extent_wait the write initiator
2824 * should take care of it. */
2825 rc = osc_extent_wait(env, waiting, OES_INV);
2827 OSC_EXTENT_DUMP(D_CACHE, waiting, "error: %d.\n", rc);
2829 osc_extent_put(env, waiting);
2835 EXPORT_SYMBOL(osc_cache_truncate_start);
2838 * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
2840 void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext)
2843 struct osc_object *obj = ext->oe_obj;
2844 bool unplug = false;
2846 EASSERT(ext->oe_nr_pages > 0, ext);
2847 EASSERT(ext->oe_state == OES_TRUNC, ext);
2848 EASSERT(!ext->oe_urgent, ext);
2850 OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
2851 osc_object_lock(obj);
2852 osc_extent_state_set(ext, OES_CACHE);
2853 if (ext->oe_fsync_wait && !ext->oe_urgent) {
2855 list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
2858 osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
2859 osc_object_unlock(obj);
2860 osc_extent_put(env, ext);
2863 osc_io_unplug_async(env, osc_cli(obj), obj);
2868 * Wait for extents in a specific range to be written out.
2869 * The caller must have called osc_cache_writeback_range() to issue IO
2870 * otherwise it will take a long time for this function to finish.
2872 * Caller must hold inode_mutex , or cancel exclusive dlm lock so that
2873 * nobody else can dirty this range of file while we're waiting for
2874 * extents to be written.
2876 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
2877 pgoff_t start, pgoff_t end)
2879 struct osc_extent *ext;
2880 pgoff_t index = start;
2885 osc_object_lock(obj);
2886 ext = osc_extent_search(obj, index);
2888 ext = first_extent(obj);
2889 else if (ext->oe_end < index)
2890 ext = next_extent(ext);
2891 while (ext != NULL) {
2894 if (ext->oe_start > end)
2897 if (!ext->oe_fsync_wait) {
2898 ext = next_extent(ext);
2902 EASSERT(ergo(ext->oe_state == OES_CACHE,
2903 ext->oe_hp || ext->oe_urgent), ext);
2904 EASSERT(ergo(ext->oe_state == OES_ACTIVE,
2905 !ext->oe_hp && ext->oe_urgent), ext);
2907 index = ext->oe_end + 1;
2908 osc_extent_get(ext);
2909 osc_object_unlock(obj);
2911 rc = osc_extent_wait(env, ext, OES_INV);
2914 osc_extent_put(env, ext);
2917 osc_object_unlock(obj);
2919 OSC_IO_DEBUG(obj, "sync file range.\n");
2922 EXPORT_SYMBOL(osc_cache_wait_range);
2925 * Called to write out a range of osc object.
2927 * @hp : should be set this is caused by lock cancel;
2928 * @discard: is set if dirty pages should be dropped - file will be deleted or
2929 * truncated, this implies there is no partially discarding extents.
2931 * Return how many pages will be issued, or error code if error occurred.
2933 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
2934 pgoff_t start, pgoff_t end, int hp, int discard)
2936 struct osc_extent *ext;
2937 LIST_HEAD(discard_list);
2938 bool unplug = false;
2942 osc_object_lock(obj);
2943 ext = osc_extent_search(obj, start);
2945 ext = first_extent(obj);
2946 else if (ext->oe_end < start)
2947 ext = next_extent(ext);
2948 while (ext != NULL) {
2949 if (ext->oe_start > end)
2952 ext->oe_fsync_wait = 1;
2953 switch (ext->oe_state) {
2955 result += ext->oe_nr_pages;
2957 struct list_head *list = NULL;
2959 EASSERT(!ext->oe_hp, ext);
2961 list = &obj->oo_hp_exts;
2962 } else if (!ext->oe_urgent) {
2964 list = &obj->oo_urgent_exts;
2967 list_move_tail(&ext->oe_link, list);
2970 struct client_obd *cli = osc_cli(obj);
2971 int pcc_bits = cli->cl_chunkbits - PAGE_SHIFT;
2972 pgoff_t align_by = (1 << pcc_bits);
2973 pgoff_t a_start = round_down(start, align_by);
2974 pgoff_t a_end = round_up(end, align_by);
2978 a_end = CL_PAGE_EOF;
2979 /* the only discarder is lock cancelling, so
2980 * [start, end], aligned by chunk size, must
2981 * contain this extent */
2982 LASSERTF(ext->oe_start >= a_start &&
2983 ext->oe_end <= a_end,
2984 "ext [%lu, %lu] reg [%lu, %lu] "
2985 "orig [%lu %lu] align %lu bits "
2986 "%d\n", ext->oe_start, ext->oe_end,
2987 a_start, a_end, start, end,
2988 align_by, pcc_bits);
2989 osc_extent_state_set(ext, OES_LOCKING);
2990 ext->oe_owner = current;
2991 list_move_tail(&ext->oe_link,
2993 osc_update_pending(obj, OBD_BRW_WRITE,
2998 /* It's pretty bad to wait for ACTIVE extents, because
2999 * we don't know how long we will wait for it to be
3000 * flushed since it may be blocked at awaiting more
3001 * grants. We do this for the correctness of fsync. */
3002 LASSERT(hp == 0 && discard == 0);
3006 /* this extent is being truncated, can't do anything
3007 * for it now. it will be set to urgent after truncate
3008 * is finished in osc_cache_truncate_end(). */
3012 ext = next_extent(ext);
3014 osc_object_unlock(obj);
3016 LASSERT(ergo(!discard, list_empty(&discard_list)));
3017 if (!list_empty(&discard_list)) {
3018 struct osc_extent *tmp;
3021 osc_list_maint(osc_cli(obj), obj);
3022 list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
3023 list_del_init(&ext->oe_link);
3024 EASSERT(ext->oe_state == OES_LOCKING, ext);
3026 /* Discard caching pages. We don't actually write this
3027 * extent out but we complete it as if we did. */
3028 rc = osc_extent_make_ready(env, ext);
3029 if (unlikely(rc < 0)) {
3030 OSC_EXTENT_DUMP(D_ERROR, ext,
3031 "make_ready returned %d\n", rc);
3036 /* finish the extent as if the pages were sent */
3037 osc_extent_finish(env, ext, 0, 0);
3042 osc_io_unplug(env, osc_cli(obj), obj);
3044 if (hp || discard) {
3046 rc = osc_cache_wait_range(env, obj, start, end);
3047 if (result >= 0 && rc < 0)
3051 OSC_IO_DEBUG(obj, "pageout [%lu, %lu], %d.\n", start, end, result);
3054 EXPORT_SYMBOL(osc_cache_writeback_range);
3057 * Returns a list of pages by a given [start, end] of \a obj.
3059 * \param resched If not NULL, then we give up before hogging CPU for too
3060 * long and set *resched = 1, in that case caller should implement a retry
3063 * Gang tree lookup (radix_tree_gang_lookup()) optimization is absolutely
3064 * crucial in the face of [offset, EOF] locks.
3066 * Return at least one page in @queue unless there is no covered page.
3068 int osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
3069 struct osc_object *osc, pgoff_t start, pgoff_t end,
3070 osc_page_gang_cbt cb, void *cbdata)
3072 struct osc_page *ops;
3073 struct pagevec *pagevec;
3079 int res = CLP_GANG_OKAY;
3080 bool tree_lock = true;
3084 pvec = osc_env_info(env)->oti_pvec;
3085 pagevec = &osc_env_info(env)->oti_pagevec;
3086 ll_pagevec_init(pagevec, 0);
3087 spin_lock(&osc->oo_tree_lock);
3088 while ((nr = radix_tree_gang_lookup(&osc->oo_tree, pvec,
3089 idx, OTI_PVEC_SIZE)) > 0) {
3090 struct cl_page *page;
3091 bool end_of_region = false;
3093 for (i = 0, j = 0; i < nr; ++i) {
3097 idx = osc_index(ops);
3099 end_of_region = true;
3103 page = ops->ops_cl.cpl_page;
3104 LASSERT(page->cp_type == CPT_CACHEABLE);
3105 if (page->cp_state == CPS_FREEING)
3109 lu_ref_add_atomic(&page->cp_reference,
3110 "gang_lookup", current);
3116 * Here a delicate locking dance is performed. Current thread
3117 * holds a reference to a page, but has to own it before it
3118 * can be placed into queue. Owning implies waiting, so
3119 * radix-tree lock is to be released. After a wait one has to
3120 * check that pages weren't truncated (cl_page_own() returns
3121 * error in the latter case).
3123 spin_unlock(&osc->oo_tree_lock);
3126 for (i = 0; i < j; ++i) {
3128 if (res == CLP_GANG_OKAY)
3129 res = (*cb)(env, io, ops, cbdata);
3131 page = ops->ops_cl.cpl_page;
3132 lu_ref_del(&page->cp_reference, "gang_lookup", current);
3133 cl_pagevec_put(env, page, pagevec);
3135 pagevec_release(pagevec);
3137 if (nr < OTI_PVEC_SIZE || end_of_region)
3140 if (res == CLP_GANG_OKAY && need_resched())
3141 res = CLP_GANG_RESCHED;
3142 if (res != CLP_GANG_OKAY)
3145 spin_lock(&osc->oo_tree_lock);
3149 spin_unlock(&osc->oo_tree_lock);
3152 EXPORT_SYMBOL(osc_page_gang_lookup);
3155 * Check if page @page is covered by an extra lock or discard it.
3157 static int check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
3158 struct osc_page *ops, void *cbdata)
3160 struct osc_thread_info *info = osc_env_info(env);
3161 struct osc_object *osc = cbdata;
3164 index = osc_index(ops);
3165 if (index >= info->oti_fn_index) {
3166 struct ldlm_lock *tmp;
3167 struct cl_page *page = ops->ops_cl.cpl_page;
3169 /* refresh non-overlapped index */
3170 tmp = osc_dlmlock_at_pgoff(env, osc, index,
3171 OSC_DAP_FL_TEST_LOCK);
3173 __u64 end = tmp->l_policy_data.l_extent.end;
3174 /* Cache the first-non-overlapped index so as to skip
3175 * all pages within [index, oti_fn_index). This is safe
3176 * because if tmp lock is canceled, it will discard
3178 info->oti_fn_index = cl_index(osc2cl(osc), end + 1);
3179 if (end == OBD_OBJECT_EOF)
3180 info->oti_fn_index = CL_PAGE_EOF;
3182 } else if (cl_page_own(env, io, page) == 0) {
3183 /* discard the page */
3184 cl_page_discard(env, io, page);
3185 cl_page_disown(env, io, page);
3187 LASSERT(page->cp_state == CPS_FREEING);
3191 info->oti_next_index = index + 1;
3192 return CLP_GANG_OKAY;
3195 int osc_discard_cb(const struct lu_env *env, struct cl_io *io,
3196 struct osc_page *ops, void *cbdata)
3198 struct osc_thread_info *info = osc_env_info(env);
3199 struct cl_page *page = ops->ops_cl.cpl_page;
3201 /* page is top page. */
3202 info->oti_next_index = osc_index(ops) + 1;
3203 if (cl_page_own(env, io, page) == 0) {
3204 if (!ergo(page->cp_type == CPT_CACHEABLE,
3205 !PageDirty(cl_page_vmpage(page))))
3206 CL_PAGE_DEBUG(D_ERROR, env, page,
3207 "discard dirty page?\n");
3209 /* discard the page */
3210 cl_page_discard(env, io, page);
3211 cl_page_disown(env, io, page);
3213 LASSERT(page->cp_state == CPS_FREEING);
3216 return CLP_GANG_OKAY;
3218 EXPORT_SYMBOL(osc_discard_cb);
3221 * Discard pages protected by the given lock. This function traverses radix
3222 * tree to find all covering pages and discard them. If a page is being covered
3223 * by other locks, it should remain in cache.
3225 * If error happens on any step, the process continues anyway (the reasoning
3226 * behind this being that lock cancellation cannot be delayed indefinitely).
3228 int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
3229 pgoff_t start, pgoff_t end, bool discard)
3231 struct osc_thread_info *info = osc_env_info(env);
3232 struct cl_io *io = osc_env_thread_io(env);
3233 osc_page_gang_cbt cb;
3239 io->ci_obj = cl_object_top(osc2cl(osc));
3240 io->ci_ignore_layout = 1;
3241 result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
3245 cb = discard ? osc_discard_cb : check_and_discard_cb;
3246 info->oti_fn_index = info->oti_next_index = start;
3248 res = osc_page_gang_lookup(env, io, osc,
3249 info->oti_next_index, end, cb, osc);
3250 if (info->oti_next_index > end)
3253 if (res == CLP_GANG_RESCHED)
3255 } while (res != CLP_GANG_OKAY);
3257 cl_io_fini(env, io);