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';
77 if (!RB_EMPTY_NODE(&ext->oe_node))
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 kref_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)
149 return rb_entry_safe(n, struct osc_extent, oe_node);
152 static inline struct osc_extent *next_extent(struct osc_extent *ext)
157 LASSERT(!RB_EMPTY_NODE(&ext->oe_node));
158 return rb_extent(rb_next(&ext->oe_node));
161 static inline struct osc_extent *prev_extent(struct osc_extent *ext)
166 LASSERT(!RB_EMPTY_NODE(&ext->oe_node));
167 return rb_extent(rb_prev(&ext->oe_node));
170 static inline struct osc_extent *first_extent(struct osc_object *obj)
172 return rb_extent(rb_first(&obj->oo_root));
175 /* object must be locked by caller. */
176 static int osc_extent_sanity_check0(struct osc_extent *ext,
177 const char *func, const int line)
179 struct osc_object *obj = ext->oe_obj;
180 struct osc_async_page *oap;
184 assert_osc_object_is_locked(obj);
186 if (ext->oe_state >= OES_STATE_MAX)
189 if (kref_read(&ext->oe_refc) <= 0)
192 if (kref_read(&ext->oe_refc) < atomic_read(&ext->oe_users))
195 switch (ext->oe_state) {
197 if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
202 if (atomic_read(&ext->oe_users) == 0)
206 if (ext->oe_fsync_wait && !ext->oe_urgent)
210 if (ext->oe_grants == 0)
212 if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp)
216 if (atomic_read(&ext->oe_users) > 0)
220 if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start)
223 if (ext->oe_sync && ext->oe_grants > 0)
226 if (ext->oe_dlmlock != NULL &&
227 ext->oe_dlmlock->l_resource->lr_type == LDLM_EXTENT &&
228 !ldlm_is_failed(ext->oe_dlmlock)) {
229 struct ldlm_extent *extent;
231 extent = &ext->oe_dlmlock->l_policy_data.l_extent;
232 if (!(extent->start <= cl_offset(osc2cl(obj), ext->oe_start) &&
233 extent->end >= cl_offset(osc2cl(obj), ext->oe_max_end)))
236 if (!(ext->oe_dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP)))
240 if (ext->oe_nr_pages > ext->oe_mppr)
243 /* Do not verify page list if extent is in RPC. This is because an
244 * in-RPC extent is supposed to be exclusively accessible w/o lock. */
245 if (ext->oe_state > OES_CACHE)
252 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
253 pgoff_t index = osc_index(oap2osc(oap));
255 if (index > ext->oe_end || index < ext->oe_start)
258 if (page_count != ext->oe_nr_pages)
263 OSC_EXTENT_DUMP_WITH_LOC(__FILE__, func, line, D_ERROR, ext,
264 "sanity check %p failed: rc = %d\n",
269 #define sanity_check_nolock(ext) \
270 osc_extent_sanity_check0(ext, __func__, __LINE__)
272 #define sanity_check(ext) ({ \
274 osc_object_lock((ext)->oe_obj); \
275 __res = sanity_check_nolock(ext); \
276 osc_object_unlock((ext)->oe_obj); \
281 overlapped(const struct osc_extent *ex1, const struct osc_extent *ex2)
283 return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
287 * sanity check - to make sure there is no overlapped extent in the tree.
289 static int osc_extent_is_overlapped(struct osc_object *obj,
290 struct osc_extent *ext)
292 struct osc_extent *tmp;
294 assert_osc_object_is_locked(obj);
299 for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) {
302 if (overlapped(tmp, ext))
308 static void osc_extent_state_set(struct osc_extent *ext, int state)
310 assert_osc_object_is_locked(ext->oe_obj);
311 LASSERT(state >= OES_INV && state < OES_STATE_MAX);
313 /* Never try to sanity check a state changing extent :-) */
314 /* LASSERT(sanity_check_nolock(ext) == 0); */
316 /* TODO: validate the state machine */
317 smp_store_release(&ext->oe_state, state);
318 wake_up(&ext->oe_waitq);
321 static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
323 struct osc_extent *ext;
325 OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_NOFS);
329 RB_CLEAR_NODE(&ext->oe_node);
331 cl_object_get(osc2cl(obj));
332 kref_init(&ext->oe_refc);
333 atomic_set(&ext->oe_users, 0);
334 INIT_LIST_HEAD(&ext->oe_link);
335 ext->oe_state = OES_INV;
336 INIT_LIST_HEAD(&ext->oe_pages);
337 init_waitqueue_head(&ext->oe_waitq);
338 ext->oe_dlmlock = NULL;
343 static void osc_extent_free(struct kref *kref)
345 struct osc_extent *ext = container_of(kref, struct osc_extent,
348 LASSERT(list_empty(&ext->oe_link));
349 LASSERT(atomic_read(&ext->oe_users) == 0);
350 LASSERT(ext->oe_state == OES_INV);
351 LASSERT(RB_EMPTY_NODE(&ext->oe_node));
353 if (ext->oe_dlmlock) {
354 lu_ref_del(&ext->oe_dlmlock->l_reference,
356 LDLM_LOCK_PUT(ext->oe_dlmlock);
357 ext->oe_dlmlock = NULL;
360 /* If/When cl_object_put drops the need for 'env',
361 * this code can be enabled, and matching code in
362 * osc_extent_put removed.
364 cl_object_put(osc2cl(ext->oe_obj));
366 OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
370 static struct osc_extent *osc_extent_get(struct osc_extent *ext)
372 LASSERT(kref_read(&ext->oe_refc) >= 0);
373 kref_get(&ext->oe_refc);
377 static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
379 LASSERT(kref_read(&ext->oe_refc) > 0);
380 if (kref_put(&ext->oe_refc, osc_extent_free)) {
381 /* This should be in osc_extent_free(), but
382 * while we need to pass 'env' it cannot be.
384 cl_object_put(env, osc2cl(ext->oe_obj));
386 OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
391 * osc_extent_put_trust() is a special version of osc_extent_put() when
392 * it's known that the caller is not the last user. This is to address the
393 * problem of lacking of lu_env ;-).
395 static void osc_extent_put_trust(struct osc_extent *ext)
397 LASSERT(kref_read(&ext->oe_refc) > 1);
398 assert_osc_object_is_locked(ext->oe_obj);
399 osc_extent_put(NULL, ext);
403 * Return the extent which includes pgoff @index, or return the greatest
404 * previous extent in the tree.
406 static struct osc_extent *osc_extent_search(struct osc_object *obj,
409 struct rb_node *n = obj->oo_root.rb_node;
410 struct osc_extent *tmp, *p = NULL;
412 assert_osc_object_is_locked(obj);
415 if (index < tmp->oe_start) {
417 } else if (index > tmp->oe_end) {
428 * Return the extent covering @index, otherwise return NULL.
429 * caller must have held object lock.
431 static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
434 struct osc_extent *ext;
436 ext = osc_extent_search(obj, index);
437 if (ext != NULL && ext->oe_start <= index && index <= ext->oe_end)
438 return osc_extent_get(ext);
442 /* caller must have held object lock. */
443 static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
445 struct rb_node **n = &obj->oo_root.rb_node;
446 struct rb_node *parent = NULL;
447 struct osc_extent *tmp;
449 LASSERT(RB_EMPTY_NODE(&ext->oe_node));
450 LASSERT(ext->oe_obj == obj);
451 assert_osc_object_is_locked(obj);
456 if (ext->oe_end < tmp->oe_start)
458 else if (ext->oe_start > tmp->oe_end)
461 EASSERTF(0, tmp, EXTSTR"\n", EXTPARA(ext));
463 rb_link_node(&ext->oe_node, parent, n);
464 rb_insert_color(&ext->oe_node, &obj->oo_root);
468 /* caller must have held object lock. */
469 static void osc_extent_erase(struct osc_extent *ext)
471 struct osc_object *obj = ext->oe_obj;
472 assert_osc_object_is_locked(obj);
473 if (!RB_EMPTY_NODE(&ext->oe_node)) {
474 rb_erase(&ext->oe_node, &obj->oo_root);
475 RB_CLEAR_NODE(&ext->oe_node);
476 /* rbtree held a refcount */
477 osc_extent_put_trust(ext);
481 static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
483 struct osc_object *obj = ext->oe_obj;
485 assert_osc_object_is_locked(obj);
486 LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE);
487 if (ext->oe_state == OES_CACHE) {
488 osc_extent_state_set(ext, OES_ACTIVE);
489 osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages);
491 atomic_inc(&ext->oe_users);
492 list_del_init(&ext->oe_link);
493 return osc_extent_get(ext);
496 static void __osc_extent_remove(struct osc_extent *ext)
498 assert_osc_object_is_locked(ext->oe_obj);
499 LASSERT(list_empty(&ext->oe_pages));
500 osc_extent_erase(ext);
501 list_del_init(&ext->oe_link);
502 osc_extent_state_set(ext, OES_INV);
503 OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
506 static void osc_extent_remove(struct osc_extent *ext)
508 struct osc_object *obj = ext->oe_obj;
510 osc_object_lock(obj);
511 __osc_extent_remove(ext);
512 osc_object_unlock(obj);
516 * This function is used to merge extents to get better performance. It checks
517 * if @cur and @victim are contiguous at block level.
519 static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
520 struct osc_extent *victim)
522 struct osc_object *obj = cur->oe_obj;
523 struct client_obd *cli = osc_cli(obj);
528 LASSERT(cur->oe_state == OES_CACHE);
529 assert_osc_object_is_locked(obj);
533 if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
536 if (cur->oe_max_end != victim->oe_max_end)
539 LASSERT(cur->oe_dlmlock == victim->oe_dlmlock);
540 ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_SHIFT;
541 chunk_start = cur->oe_start >> ppc_bits;
542 chunk_end = cur->oe_end >> ppc_bits;
543 if (chunk_start != (victim->oe_end >> ppc_bits) + 1 &&
544 chunk_end + 1 != victim->oe_start >> ppc_bits)
547 /* overall extent size should not exceed the max supported limit
548 * reported by the server */
549 if (cur->oe_end - cur->oe_start + 1 +
550 victim->oe_end - victim->oe_start + 1 > cli->cl_max_extent_pages)
553 OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
555 cur->oe_start = min(cur->oe_start, victim->oe_start);
556 cur->oe_end = max(cur->oe_end, victim->oe_end);
557 /* per-extent tax should be accounted only once for the whole extent */
558 cur->oe_grants += victim->oe_grants - cli->cl_grant_extent_tax;
559 cur->oe_nr_pages += victim->oe_nr_pages;
560 /* only the following bits are needed to merge */
561 cur->oe_urgent |= victim->oe_urgent;
562 cur->oe_memalloc |= victim->oe_memalloc;
563 list_splice_init(&victim->oe_pages, &cur->oe_pages);
564 list_del_init(&victim->oe_link);
565 victim->oe_nr_pages = 0;
567 osc_extent_get(victim);
568 __osc_extent_remove(victim);
569 osc_extent_put(env, victim);
571 OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
576 * Drop user count of osc_extent, and unplug IO asynchronously.
578 int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
580 struct osc_object *obj = ext->oe_obj;
581 struct client_obd *cli = osc_cli(obj);
585 LASSERT(atomic_read(&ext->oe_users) > 0);
586 LASSERT(sanity_check(ext) == 0);
587 LASSERT(ext->oe_grants > 0);
589 if (atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) {
590 LASSERT(ext->oe_state == OES_ACTIVE);
591 if (ext->oe_trunc_pending) {
592 /* a truncate process is waiting for this extent.
593 * This may happen due to a race, check
594 * osc_cache_truncate_start(). */
595 osc_extent_state_set(ext, OES_TRUNC);
596 ext->oe_trunc_pending = 0;
597 osc_object_unlock(obj);
601 osc_extent_state_set(ext, OES_CACHE);
602 osc_update_pending(obj, OBD_BRW_WRITE,
605 /* try to merge the previous and next extent. */
606 if (osc_extent_merge(env, ext, prev_extent(ext)) == 0)
607 grant += cli->cl_grant_extent_tax;
608 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
609 grant += cli->cl_grant_extent_tax;
612 list_move_tail(&ext->oe_link,
614 else if (ext->oe_urgent)
615 list_move_tail(&ext->oe_link,
616 &obj->oo_urgent_exts);
617 else if (ext->oe_nr_pages == ext->oe_mppr) {
618 list_move_tail(&ext->oe_link,
621 osc_object_unlock(obj);
623 osc_unreserve_grant(cli, 0, grant);
626 osc_io_unplug_async(env, cli, obj);
628 osc_extent_put(env, ext);
633 * Find or create an extent which includes @index, core function to manage
636 static struct osc_extent *osc_extent_find(const struct lu_env *env,
637 struct osc_object *obj, pgoff_t index,
638 unsigned int *grants)
640 struct client_obd *cli = osc_cli(obj);
641 struct osc_lock *olck;
642 struct cl_lock_descr *descr;
643 struct osc_extent *cur;
644 struct osc_extent *ext;
645 struct osc_extent *conflict = NULL;
646 struct osc_extent *found = NULL;
649 unsigned int max_pages; /* max_pages_per_rpc */
650 unsigned int chunksize;
651 int ppc_bits; /* pages per chunk bits */
656 cur = osc_extent_alloc(obj);
658 RETURN(ERR_PTR(-ENOMEM));
660 olck = osc_env_io(env)->oi_write_osclock;
661 LASSERTF(olck != NULL, "page %lu is not covered by lock\n", index);
662 LASSERT(olck->ols_state == OLS_GRANTED);
664 descr = &olck->ols_cl.cls_lock->cll_descr;
665 LASSERT(descr->cld_mode >= CLM_WRITE);
667 LASSERTF(cli->cl_chunkbits >= PAGE_SHIFT,
668 "chunkbits: %u\n", cli->cl_chunkbits);
669 ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
670 chunk_mask = ~((1 << ppc_bits) - 1);
671 chunksize = 1 << cli->cl_chunkbits;
672 chunk = index >> ppc_bits;
674 /* align end to RPC edge. */
675 max_pages = cli->cl_max_pages_per_rpc;
676 if ((max_pages & ~chunk_mask) != 0) {
677 CERROR("max_pages: %#x chunkbits: %u chunk_mask: %#lx\n",
678 max_pages, cli->cl_chunkbits, chunk_mask);
679 RETURN(ERR_PTR(-EINVAL));
681 max_end = index - (index % max_pages) + max_pages - 1;
682 max_end = min_t(pgoff_t, max_end, descr->cld_end);
684 /* initialize new extent by parameters so far */
685 cur->oe_max_end = max_end;
686 cur->oe_start = index & chunk_mask;
687 cur->oe_end = ((index + ~chunk_mask + 1) & chunk_mask) - 1;
688 if (cur->oe_start < descr->cld_start)
689 cur->oe_start = descr->cld_start;
690 if (cur->oe_end > max_end)
691 cur->oe_end = max_end;
693 cur->oe_mppr = max_pages;
694 if (olck->ols_dlmlock != NULL) {
695 LASSERT(olck->ols_hold);
696 cur->oe_dlmlock = LDLM_LOCK_GET(olck->ols_dlmlock);
697 lu_ref_add(&olck->ols_dlmlock->l_reference, "osc_extent", cur);
700 /* grants has been allocated by caller */
701 LASSERTF(*grants >= chunksize + cli->cl_grant_extent_tax,
702 "%u/%u/%u.\n", *grants, chunksize, cli->cl_grant_extent_tax);
703 LASSERTF((max_end - cur->oe_start) < max_pages, EXTSTR"\n",
707 osc_object_lock(obj);
708 ext = osc_extent_search(obj, cur->oe_start);
710 ext = first_extent(obj);
711 for (; ext; ext = next_extent(ext)) {
712 pgoff_t ext_chk_start = ext->oe_start >> ppc_bits;
713 pgoff_t ext_chk_end = ext->oe_end >> ppc_bits;
715 LASSERT(sanity_check_nolock(ext) == 0);
716 if (chunk > ext_chk_end + 1 || chunk < ext_chk_start)
719 /* if covering by different locks, no chance to match */
720 if (olck->ols_dlmlock != ext->oe_dlmlock) {
721 EASSERTF(!overlapped(ext, cur), ext,
722 EXTSTR"\n", EXTPARA(cur));
727 /* discontiguous chunks? */
728 if (chunk + 1 < ext_chk_start)
731 /* ok, from now on, ext and cur have these attrs:
732 * 1. covered by the same lock
733 * 2. contiguous at chunk level or overlapping. */
735 if (overlapped(ext, cur)) {
736 /* cur is the minimum unit, so overlapping means
738 EASSERTF((ext->oe_start <= cur->oe_start &&
739 ext->oe_end >= cur->oe_end),
740 ext, EXTSTR"\n", EXTPARA(cur));
742 if (ext->oe_state > OES_CACHE || ext->oe_fsync_wait) {
743 /* for simplicity, we wait for this extent to
744 * finish before going forward. */
745 conflict = osc_extent_get(ext);
749 found = osc_extent_hold(ext);
753 /* non-overlapped extent */
754 if (ext->oe_state != OES_CACHE || ext->oe_fsync_wait)
755 /* we can't do anything for a non OES_CACHE extent, or
756 * if there is someone waiting for this extent to be
757 * flushed, try next one. */
760 /* check if they belong to the same rpc slot before trying to
761 * merge. the extents are not overlapped and contiguous at
762 * chunk level to get here. */
763 if (ext->oe_max_end != max_end)
764 /* if they don't belong to the same RPC slot or
765 * max_pages_per_rpc has ever changed, do not merge. */
768 /* check whether maximum extent size will be hit */
769 if ((ext_chk_end - ext_chk_start + 1 + 1) << ppc_bits >
770 cli->cl_max_extent_pages)
773 /* it's required that an extent must be contiguous at chunk
774 * level so that we know the whole extent is covered by grant
775 * (the pages in the extent are NOT required to be contiguous).
776 * Otherwise, it will be too much difficult to know which
777 * chunks have grants allocated. */
779 /* try to do front merge - extend ext's start */
780 if (chunk + 1 == ext_chk_start) {
781 /* ext must be chunk size aligned */
782 EASSERT((ext->oe_start & ~chunk_mask) == 0, ext);
784 /* pull ext's start back to cover cur */
785 ext->oe_start = cur->oe_start;
786 ext->oe_grants += chunksize;
787 LASSERT(*grants >= chunksize);
788 *grants -= chunksize;
790 found = osc_extent_hold(ext);
791 } else if (chunk == ext_chk_end + 1) {
793 ext->oe_end = cur->oe_end;
794 ext->oe_grants += chunksize;
795 LASSERT(*grants >= chunksize);
796 *grants -= chunksize;
798 /* try to merge with the next one because we just fill
800 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
801 /* we can save extent tax from next extent */
802 *grants += cli->cl_grant_extent_tax;
804 found = osc_extent_hold(ext);
810 osc_extent_tree_dump(D_CACHE, obj);
812 LASSERT(conflict == NULL);
813 if (!IS_ERR(found)) {
814 LASSERT(found->oe_dlmlock == cur->oe_dlmlock);
815 OSC_EXTENT_DUMP(D_CACHE, found,
816 "found caching ext for %lu.\n", index);
818 } else if (conflict == NULL) {
819 /* create a new extent */
820 EASSERT(osc_extent_is_overlapped(obj, cur) == 0, cur);
821 cur->oe_grants = chunksize + cli->cl_grant_extent_tax;
822 LASSERT(*grants >= cur->oe_grants);
823 *grants -= cur->oe_grants;
825 cur->oe_state = OES_CACHE;
826 found = osc_extent_hold(cur);
827 osc_extent_insert(obj, cur);
828 OSC_EXTENT_DUMP(D_CACHE, cur, "add into tree %lu/%lu.\n",
829 index, descr->cld_end);
831 osc_object_unlock(obj);
833 if (conflict != NULL) {
834 LASSERT(found == NULL);
836 /* waiting for IO to finish. Please notice that it's impossible
837 * to be an OES_TRUNC extent. */
838 rc = osc_extent_wait(env, conflict, OES_INV);
839 osc_extent_put(env, conflict);
842 GOTO(out, found = ERR_PTR(rc));
849 osc_extent_put(env, cur);
854 * Called when IO is finished to an extent.
856 int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
859 struct client_obd *cli = osc_cli(ext->oe_obj);
860 struct osc_async_page *oap;
861 struct osc_async_page *tmp;
862 int nr_pages = ext->oe_nr_pages;
864 int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
869 OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n");
871 ext->oe_rc = rc ?: ext->oe_nr_pages;
872 EASSERT(ergo(rc == 0, ext->oe_state == OES_RPC), ext);
874 osc_lru_add_batch(cli, &ext->oe_pages);
875 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
877 list_del_init(&oap->oap_rpc_item);
878 list_del_init(&oap->oap_pending_item);
879 if (last_off <= oap->oap_obj_off) {
880 last_off = oap->oap_obj_off;
881 last_count = oap->oap_count;
885 osc_ap_completion(env, cli, oap, sent, rc);
887 EASSERT(ext->oe_nr_pages == 0, ext);
890 lost_grant = ext->oe_grants;
891 } else if (blocksize < PAGE_SIZE &&
892 last_count != PAGE_SIZE) {
893 /* For short writes we shouldn't count parts of pages that
894 * span a whole chunk on the OST side, or our accounting goes
895 * wrong. Should match the code in filter_grant_check. */
896 int offset = last_off & ~PAGE_MASK;
897 int count = last_count + (offset & (blocksize - 1));
898 int end = (offset + last_count) & (blocksize - 1);
900 count += blocksize - end;
902 lost_grant = PAGE_SIZE - count;
904 if (ext->oe_grants > 0)
905 osc_free_grant(cli, nr_pages, lost_grant, ext->oe_grants);
907 osc_extent_remove(ext);
908 /* put the refcount for RPC */
909 osc_extent_put(env, ext);
914 * Wait for the extent's state to become @state.
916 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
917 enum osc_extent_state state)
919 struct osc_object *obj = ext->oe_obj;
923 osc_object_lock(obj);
924 LASSERT(sanity_check_nolock(ext) == 0);
925 /* `Kick' this extent only if the caller is waiting for it to be
927 if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp) {
928 if (ext->oe_state == OES_ACTIVE) {
930 } else if (ext->oe_state == OES_CACHE) {
932 osc_extent_hold(ext);
936 osc_object_unlock(obj);
938 osc_extent_release(env, ext);
940 /* wait for the extent until its state becomes @state */
941 rc = wait_event_idle_timeout(ext->oe_waitq,
942 smp_load_acquire(&ext->oe_state) == state,
943 cfs_time_seconds(600));
945 OSC_EXTENT_DUMP(D_ERROR, ext,
946 "%s: wait ext to %u timedout, recovery in progress?\n",
947 cli_name(osc_cli(obj)), state);
949 wait_event_idle(ext->oe_waitq,
950 smp_load_acquire(&ext->oe_state) == state);
960 * Discard pages with index greater than @size. If @ext is overlapped with
961 * @size, then partial truncate happens.
963 static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
968 struct osc_object *obj = ext->oe_obj;
969 struct client_obd *cli = osc_cli(obj);
970 struct osc_async_page *oap;
971 struct osc_async_page *tmp;
972 struct pagevec *pvec;
973 int pages_in_chunk = 0;
974 int ppc_bits = cli->cl_chunkbits -
976 __u64 trunc_chunk = trunc_index >> ppc_bits;
983 LASSERT(sanity_check(ext) == 0);
984 LASSERT(ext->oe_state == OES_TRUNC);
985 LASSERT(!ext->oe_urgent);
987 /* Request new lu_env.
988 * We can't use that env from osc_cache_truncate_start() because
989 * it's from lov_io_sub and not fully initialized. */
990 env = cl_env_get(&refcheck);
992 RETURN(PTR_ERR(env));
994 io = osc_env_thread_io(env);
995 io->ci_obj = cl_object_top(osc2cl(obj));
996 io->ci_ignore_layout = 1;
997 pvec = &osc_env_info(env)->oti_pagevec;
998 ll_pagevec_init(pvec, 0);
999 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
1003 /* discard all pages with index greater than trunc_index */
1004 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
1006 pgoff_t index = osc_index(oap2osc(oap));
1007 struct cl_page *page = oap2cl_page(oap);
1009 LASSERT(list_empty(&oap->oap_rpc_item));
1011 /* only discard the pages with their index greater than
1012 * trunc_index, and ... */
1013 if (index < trunc_index ||
1014 (index == trunc_index && partial)) {
1015 /* accounting how many pages remaining in the chunk
1016 * so that we can calculate grants correctly. */
1017 if (index >> ppc_bits == trunc_chunk)
1022 list_del_init(&oap->oap_pending_item);
1025 lu_ref_add(&page->cp_reference, "truncate", current);
1027 if (cl_page_own(env, io, page) == 0) {
1028 cl_page_discard(env, io, page);
1029 cl_page_disown(env, io, page);
1031 LASSERT(page->cp_state == CPS_FREEING);
1035 lu_ref_del(&page->cp_reference, "truncate", current);
1036 cl_pagevec_put(env, page, pvec);
1041 pagevec_release(pvec);
1043 EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial,
1044 ext->oe_nr_pages == 0),
1045 ext, "trunc_index %lu, partial %d\n", trunc_index, partial);
1047 osc_object_lock(obj);
1048 if (ext->oe_nr_pages == 0) {
1049 LASSERT(pages_in_chunk == 0);
1050 grants = ext->oe_grants;
1052 } else { /* calculate how many grants we can free */
1053 int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
1057 /* if there is no pages in this chunk, we can also free grants
1058 * for the last chunk */
1059 if (pages_in_chunk == 0) {
1060 /* if this is the 1st chunk and no pages in this chunk,
1061 * ext->oe_nr_pages must be zero, so we should be in
1062 * the other if-clause. */
1063 LASSERT(trunc_chunk > 0);
1068 /* this is what we can free from this extent */
1069 grants = chunks << cli->cl_chunkbits;
1070 ext->oe_grants -= grants;
1071 last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
1072 ext->oe_end = min(last_index, ext->oe_max_end);
1073 LASSERT(ext->oe_end >= ext->oe_start);
1074 LASSERT(ext->oe_grants > 0);
1076 osc_object_unlock(obj);
1078 if (grants > 0 || nr_pages > 0)
1079 osc_free_grant(cli, nr_pages, grants, grants);
1082 cl_io_fini(env, io);
1083 cl_env_put(env, &refcheck);
1088 * This function is used to make the extent prepared for transfer.
1089 * A race with flusing page - ll_writepage() has to be handled cautiously.
1091 static int osc_extent_make_ready(const struct lu_env *env,
1092 struct osc_extent *ext)
1094 struct osc_async_page *oap;
1095 struct osc_async_page *last = NULL;
1096 struct osc_object *obj = ext->oe_obj;
1097 unsigned int page_count = 0;
1101 /* we're going to grab page lock, so object lock must not be taken. */
1102 LASSERT(sanity_check(ext) == 0);
1103 /* in locking state, any process should not touch this extent. */
1104 EASSERT(ext->oe_state == OES_LOCKING, ext);
1105 EASSERT(ext->oe_owner != NULL, ext);
1107 OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
1109 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1111 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
1114 /* checking ASYNC_READY is race safe */
1115 if ((oap->oap_async_flags & ASYNC_READY) != 0)
1118 rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
1121 spin_lock(&oap->oap_lock);
1122 oap->oap_async_flags |= ASYNC_READY;
1123 spin_unlock(&oap->oap_lock);
1126 LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
1129 LASSERTF(0, "unknown return code: %d\n", rc);
1133 LASSERT(page_count == ext->oe_nr_pages);
1134 LASSERT(last != NULL);
1135 /* the last page is the only one we need to refresh its count by
1136 * the size of file. */
1137 if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
1138 int last_oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
1139 LASSERT(last_oap_count > 0);
1140 LASSERT(last->oap_page_off + last_oap_count <= PAGE_SIZE);
1141 last->oap_count = last_oap_count;
1142 spin_lock(&last->oap_lock);
1143 last->oap_async_flags |= ASYNC_COUNT_STABLE;
1144 spin_unlock(&last->oap_lock);
1147 /* for the rest of pages, we don't need to call osf_refresh_count()
1148 * because it's known they are not the last page */
1149 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1150 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
1151 oap->oap_count = PAGE_SIZE - oap->oap_page_off;
1152 spin_lock(&oap->oap_lock);
1153 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1154 spin_unlock(&oap->oap_lock);
1158 osc_object_lock(obj);
1159 osc_extent_state_set(ext, OES_RPC);
1160 osc_object_unlock(obj);
1161 /* get a refcount for RPC. */
1162 osc_extent_get(ext);
1168 * Quick and simple version of osc_extent_find(). This function is frequently
1169 * called to expand the extent for the same IO. To expand the extent, the
1170 * page index must be in the same or next chunk of ext->oe_end.
1172 static int osc_extent_expand(struct osc_extent *ext, pgoff_t index,
1173 unsigned int *grants)
1175 struct osc_object *obj = ext->oe_obj;
1176 struct client_obd *cli = osc_cli(obj);
1177 struct osc_extent *next;
1178 int ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
1179 pgoff_t chunk = index >> ppc_bits;
1182 unsigned int chunksize = 1 << cli->cl_chunkbits;
1186 LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
1187 osc_object_lock(obj);
1188 LASSERT(sanity_check_nolock(ext) == 0);
1189 end_chunk = ext->oe_end >> ppc_bits;
1190 if (chunk > end_chunk + 1)
1191 GOTO(out, rc = -ERANGE);
1193 if (end_chunk >= chunk)
1196 LASSERT(end_chunk + 1 == chunk);
1198 /* try to expand this extent to cover @index */
1199 end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
1201 /* don't go over the maximum extent size reported by server */
1202 if (end_index - ext->oe_start + 1 > cli->cl_max_extent_pages)
1203 GOTO(out, rc = -ERANGE);
1205 next = next_extent(ext);
1206 if (next != NULL && next->oe_start <= end_index)
1207 /* complex mode - overlapped with the next extent,
1208 * this case will be handled by osc_extent_find() */
1209 GOTO(out, rc = -EAGAIN);
1211 ext->oe_end = end_index;
1212 ext->oe_grants += chunksize;
1213 LASSERT(*grants >= chunksize);
1214 *grants -= chunksize;
1215 EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
1216 "overlapped after expanding for %lu.\n", index);
1220 osc_object_unlock(obj);
1224 static void osc_extent_tree_dump0(int mask, struct osc_object *obj,
1225 const char *func, int line)
1227 struct osc_extent *ext;
1230 if (!cfs_cdebug_show(mask, DEBUG_SUBSYSTEM))
1233 CDEBUG(mask, "Dump object %p extents at %s:%d, mppr: %u.\n",
1234 obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
1236 /* osc_object_lock(obj); */
1238 for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
1239 OSC_EXTENT_DUMP(mask, ext, "in tree %d.\n", cnt++);
1242 list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
1243 OSC_EXTENT_DUMP(mask, ext, "hp %d.\n", cnt++);
1246 list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
1247 OSC_EXTENT_DUMP(mask, ext, "urgent %d.\n", cnt++);
1250 list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
1251 OSC_EXTENT_DUMP(mask, ext, "reading %d.\n", cnt++);
1252 /* osc_object_unlock(obj); */
1255 /* ------------------ osc extent end ------------------ */
1257 static inline int osc_is_ready(struct osc_object *osc)
1259 return !list_empty(&osc->oo_ready_item) ||
1260 !list_empty(&osc->oo_hp_ready_item);
1263 #define OSC_IO_DEBUG(OSC, STR, args...) \
1264 CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
1265 (OSC), osc_is_ready(OSC), \
1266 list_empty_marker(&(OSC)->oo_hp_ready_item), \
1267 list_empty_marker(&(OSC)->oo_ready_item), \
1268 atomic_read(&(OSC)->oo_nr_writes), \
1269 list_empty_marker(&(OSC)->oo_hp_exts), \
1270 list_empty_marker(&(OSC)->oo_urgent_exts), \
1271 atomic_read(&(OSC)->oo_nr_reads), \
1272 list_empty_marker(&(OSC)->oo_reading_exts), \
1275 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
1278 struct osc_page *opg = oap2osc_page(oap);
1279 struct cl_page *page = oap2cl_page(oap);
1282 LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
1285 result = cl_page_make_ready(env, page, CRT_WRITE);
1287 opg->ops_submit_time = ktime_get();
1291 static int osc_refresh_count(const struct lu_env *env,
1292 struct osc_async_page *oap, int cmd)
1294 struct osc_page *opg = oap2osc_page(oap);
1295 pgoff_t index = osc_index(oap2osc(oap));
1296 struct cl_object *obj;
1297 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1301 /* readpage queues with _COUNT_STABLE, shouldn't get here. */
1302 LASSERT(!(cmd & OBD_BRW_READ));
1303 LASSERT(opg != NULL);
1304 obj = opg->ops_cl.cpl_obj;
1306 cl_object_attr_lock(obj);
1307 result = cl_object_attr_get(env, obj, attr);
1308 cl_object_attr_unlock(obj);
1311 kms = attr->cat_kms;
1312 if (cl_offset(obj, index) >= kms)
1313 /* catch race with truncate */
1315 else if (cl_offset(obj, index + 1) > kms)
1316 /* catch sub-page write at end of file */
1317 return kms & ~PAGE_MASK;
1322 static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
1325 struct osc_page *opg = oap2osc_page(oap);
1326 struct cl_page *page = oap2cl_page(oap);
1327 enum cl_req_type crt;
1332 cmd &= ~OBD_BRW_NOQUOTA;
1333 LASSERTF(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ),
1334 "cp_state:%u, cmd:%d\n", page->cp_state, cmd);
1335 LASSERTF(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE),
1336 "cp_state:%u, cmd:%d\n", page->cp_state, cmd);
1337 LASSERT(opg->ops_transfer_pinned);
1339 crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
1340 /* Clear opg->ops_transfer_pinned before VM lock is released. */
1341 opg->ops_transfer_pinned = 0;
1343 opg->ops_submit_time = ktime_set(0, 0);
1344 srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
1347 if (rc == 0 && srvlock) {
1348 struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
1349 struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
1350 size_t bytes = oap->oap_count;
1352 if (crt == CRT_READ)
1353 stats->os_lockless_reads += bytes;
1355 stats->os_lockless_writes += bytes;
1359 * This has to be the last operation with the page, as locks are
1360 * released in cl_page_completion() and nothing except for the
1361 * reference counter protects page from concurrent reclaim.
1363 lu_ref_del(&page->cp_reference, "transfer", page);
1365 cl_page_completion(env, page, crt, rc);
1366 cl_page_put(env, page);
1371 #define OSC_DUMP_GRANT(mask, cli, fmt, args...) do { \
1372 struct client_obd *__tmp = (cli); \
1373 CDEBUG(mask, "%s: grant { dirty: %ld/%ld dirty_pages: %ld/%lu " \
1374 "dropped: %ld avail: %ld, dirty_grant: %ld, " \
1375 "reserved: %ld, flight: %d } lru {in list: %ld, " \
1376 "left: %ld, waiters: %d }" fmt "\n", \
1378 __tmp->cl_dirty_pages, __tmp->cl_dirty_max_pages, \
1379 atomic_long_read(&obd_dirty_pages), obd_max_dirty_pages, \
1380 __tmp->cl_lost_grant, __tmp->cl_avail_grant, \
1381 __tmp->cl_dirty_grant, \
1382 __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, \
1383 atomic_long_read(&__tmp->cl_lru_in_list), \
1384 atomic_long_read(&__tmp->cl_lru_busy), \
1385 atomic_read(&__tmp->cl_lru_shrinkers), ##args); \
1388 /* caller must hold loi_list_lock */
1389 static void osc_consume_write_grant(struct client_obd *cli,
1390 struct brw_page *pga)
1392 assert_spin_locked(&cli->cl_loi_list_lock);
1393 LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
1394 cli->cl_dirty_pages++;
1395 pga->flag |= OBD_BRW_FROM_GRANT;
1396 CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
1397 PAGE_SIZE, pga, pga->pg);
1398 osc_update_next_shrink(cli);
1401 /* the companion to osc_consume_write_grant, called when a brw has completed.
1402 * must be called with the loi lock held. */
1403 static void osc_release_write_grant(struct client_obd *cli,
1404 struct brw_page *pga)
1408 assert_spin_locked(&cli->cl_loi_list_lock);
1409 if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
1414 pga->flag &= ~OBD_BRW_FROM_GRANT;
1415 atomic_long_dec(&obd_dirty_pages);
1416 cli->cl_dirty_pages--;
1421 * To avoid sleeping with object lock held, it's good for us allocate enough
1422 * grants before entering into critical section.
1424 * client_obd_list_lock held by caller
1426 static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
1430 if (cli->cl_avail_grant >= bytes) {
1431 cli->cl_avail_grant -= bytes;
1432 cli->cl_reserved_grant += bytes;
1438 static void __osc_unreserve_grant(struct client_obd *cli,
1439 unsigned int reserved, unsigned int unused)
1441 /* it's quite normal for us to get more grant than reserved.
1442 * Thinking about a case that two extents merged by adding a new
1443 * chunk, we can save one extent tax. If extent tax is greater than
1444 * one chunk, we can save more grant by adding a new chunk */
1445 cli->cl_reserved_grant -= reserved;
1446 if (unused > reserved) {
1447 cli->cl_avail_grant += reserved;
1448 cli->cl_lost_grant += unused - reserved;
1449 cli->cl_dirty_grant -= unused - reserved;
1451 cli->cl_avail_grant += unused;
1452 cli->cl_dirty_grant += reserved - unused;
1456 static void osc_unreserve_grant_nolock(struct client_obd *cli,
1457 unsigned int reserved,
1458 unsigned int unused)
1460 __osc_unreserve_grant(cli, reserved, unused);
1462 osc_wake_cache_waiters(cli);
1465 static void osc_unreserve_grant(struct client_obd *cli,
1466 unsigned int reserved, unsigned int unused)
1468 spin_lock(&cli->cl_loi_list_lock);
1469 osc_unreserve_grant_nolock(cli, reserved, unused);
1470 spin_unlock(&cli->cl_loi_list_lock);
1474 * Free grant after IO is finished or canceled.
1476 * @lost_grant is used to remember how many grants we have allocated but not
1477 * used, we should return these grants to OST. There're two cases where grants
1480 * 2. blocksize at OST is less than PAGE_SIZE and a partial page was
1481 * written. In this case OST may use less chunks to serve this partial
1482 * write. OSTs don't actually know the page size on the client side. so
1483 * clients have to calculate lost grant by the blocksize on the OST.
1484 * See filter_grant_check() for details.
1486 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
1487 unsigned int lost_grant, unsigned int dirty_grant)
1489 unsigned long grant;
1491 grant = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
1493 spin_lock(&cli->cl_loi_list_lock);
1494 atomic_long_sub(nr_pages, &obd_dirty_pages);
1495 cli->cl_dirty_pages -= nr_pages;
1496 cli->cl_lost_grant += lost_grant;
1497 cli->cl_dirty_grant -= dirty_grant;
1498 if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) {
1499 /* borrow some grant from truncate to avoid the case that
1500 * truncate uses up all avail grant */
1501 cli->cl_lost_grant -= grant;
1502 cli->cl_avail_grant += grant;
1504 osc_wake_cache_waiters(cli);
1505 spin_unlock(&cli->cl_loi_list_lock);
1506 CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu/%lu\n",
1507 lost_grant, cli->cl_lost_grant,
1508 cli->cl_avail_grant, cli->cl_dirty_pages << PAGE_SHIFT,
1509 cli->cl_dirty_grant);
1513 * The companion to osc_enter_cache(), called when @oap is no longer part of
1514 * the dirty accounting due to error.
1516 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
1518 spin_lock(&cli->cl_loi_list_lock);
1519 osc_release_write_grant(cli, &oap->oap_brw_page);
1520 spin_unlock(&cli->cl_loi_list_lock);
1524 * Non-blocking version of osc_enter_cache() that consumes grant only when it
1527 static int osc_enter_cache_try(struct client_obd *cli,
1528 struct osc_async_page *oap,
1533 OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
1535 rc = osc_reserve_grant(cli, bytes);
1539 if (cli->cl_dirty_pages < cli->cl_dirty_max_pages) {
1540 if (atomic_long_add_return(1, &obd_dirty_pages) <=
1541 obd_max_dirty_pages) {
1542 osc_consume_write_grant(cli, &oap->oap_brw_page);
1546 atomic_long_dec(&obd_dirty_pages);
1548 __osc_unreserve_grant(cli, bytes, bytes);
1554 /* Following two inlines exist to pass code fragments
1555 * to wait_event_idle_exclusive_timeout_cmd(). Passing
1556 * code fragments as macro args can look confusing, so
1557 * we provide inlines to encapsulate them.
1559 static inline void cli_unlock_and_unplug(const struct lu_env *env,
1560 struct client_obd *cli,
1561 struct osc_async_page *oap)
1563 spin_unlock(&cli->cl_loi_list_lock);
1564 osc_io_unplug_async(env, cli, NULL);
1566 "%s: sleeping for cache space for %p\n",
1567 cli_name(cli), oap);
1570 static inline void cli_lock_after_unplug(struct client_obd *cli)
1572 spin_lock(&cli->cl_loi_list_lock);
1575 * The main entry to reserve dirty page accounting. Usually the grant reserved
1576 * in this function will be freed in bulk in osc_free_grant() unless it fails
1577 * to add osc cache, in that case, it will be freed in osc_exit_cache().
1579 * The process will be put into sleep if it's already run out of grant.
1581 static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
1582 struct osc_async_page *oap, int bytes)
1584 struct osc_object *osc = oap->oap_obj;
1585 struct lov_oinfo *loi = osc->oo_oinfo;
1587 unsigned long timeout = cfs_time_seconds(AT_OFF ? obd_timeout : at_max);
1589 bool entered = false;
1593 OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
1595 spin_lock(&cli->cl_loi_list_lock);
1597 /* force the caller to try sync io. this can jump the list
1598 * of queued writes and create a discontiguous rpc stream */
1599 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
1600 cli->cl_dirty_max_pages == 0 ||
1601 cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) {
1602 OSC_DUMP_GRANT(D_CACHE, cli, "forced sync i/o\n");
1603 GOTO(out, rc = -EDQUOT);
1607 * We can wait here for two reasons: too many dirty pages in cache, or
1608 * run out of grants. In both cases we should write dirty pages out.
1609 * Adding a cache waiter will trigger urgent write-out no matter what
1611 * The exiting condition (other than success) is no avail grants
1612 * and no dirty pages caching, that really means there is no space
1615 remain = wait_event_idle_exclusive_timeout_cmd(
1616 cli->cl_cache_waiters,
1617 (entered = osc_enter_cache_try(cli, oap, bytes)) ||
1618 (cli->cl_dirty_pages == 0 && cli->cl_w_in_flight == 0),
1620 cli_unlock_and_unplug(env, cli, oap),
1621 cli_lock_after_unplug(cli));
1624 if (remain == timeout)
1625 OSC_DUMP_GRANT(D_CACHE, cli, "granted from cache\n");
1627 OSC_DUMP_GRANT(D_CACHE, cli,
1628 "finally got grant space\n");
1629 wake_up(&cli->cl_cache_waiters);
1631 } else if (remain == 0) {
1632 OSC_DUMP_GRANT(D_CACHE, cli,
1633 "timeout, fall back to sync i/o\n");
1634 osc_extent_tree_dump(D_CACHE, osc);
1635 /* fall back to synchronous I/O */
1637 OSC_DUMP_GRANT(D_CACHE, cli,
1638 "no grant space, fall back to sync i/o\n");
1639 wake_up_all(&cli->cl_cache_waiters);
1643 spin_unlock(&cli->cl_loi_list_lock);
1647 static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
1649 int hprpc = !!list_empty(&osc->oo_hp_exts);
1650 return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
1653 /* This maintains the lists of pending pages to read/write for a given object
1654 * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
1655 * to quickly find objects that are ready to send an RPC. */
1656 static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
1659 int invalid_import = 0;
1662 /* if we have an invalid import we want to drain the queued pages
1663 * by forcing them through rpcs that immediately fail and complete
1664 * the pages. recovery relies on this to empty the queued pages
1665 * before canceling the locks and evicting down the llite pages */
1666 if ((cli->cl_import == NULL || cli->cl_import->imp_invalid))
1669 if (cmd & OBD_BRW_WRITE) {
1670 if (atomic_read(&osc->oo_nr_writes) == 0)
1672 if (invalid_import) {
1673 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1676 if (!list_empty(&osc->oo_hp_exts)) {
1677 CDEBUG(D_CACHE, "high prio request forcing RPC\n");
1680 if (!list_empty(&osc->oo_urgent_exts)) {
1681 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1684 /* trigger a write rpc stream as long as there are dirtiers
1685 * waiting for space. as they're waiting, they're not going to
1686 * create more pages to coalesce with what's waiting..
1688 if (waitqueue_active(&cli->cl_cache_waiters)) {
1689 CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1692 if (!list_empty(&osc->oo_full_exts)) {
1693 CDEBUG(D_CACHE, "full extent ready, make an RPC\n");
1697 if (atomic_read(&osc->oo_nr_reads) == 0)
1699 if (invalid_import) {
1700 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1703 /* all read are urgent. */
1704 if (!list_empty(&osc->oo_reading_exts))
1711 static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
1713 struct client_obd *cli = osc_cli(obj);
1714 if (cmd & OBD_BRW_WRITE) {
1715 atomic_add(delta, &obj->oo_nr_writes);
1716 atomic_add(delta, &cli->cl_pending_w_pages);
1717 LASSERT(atomic_read(&obj->oo_nr_writes) >= 0);
1719 atomic_add(delta, &obj->oo_nr_reads);
1720 atomic_add(delta, &cli->cl_pending_r_pages);
1721 LASSERT(atomic_read(&obj->oo_nr_reads) >= 0);
1723 OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
1726 static int osc_makes_hprpc(struct osc_object *obj)
1728 return !list_empty(&obj->oo_hp_exts);
1731 static void on_list(struct list_head *item, struct list_head *list,
1734 if (list_empty(item) && should_be_on)
1735 list_add_tail(item, list);
1736 else if (!list_empty(item) && !should_be_on)
1737 list_del_init(item);
1740 /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
1741 * can find pages to build into rpcs quickly */
1742 static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1744 if (osc_makes_hprpc(osc)) {
1746 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
1747 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
1749 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
1750 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
1751 osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
1752 osc_makes_rpc(cli, osc, OBD_BRW_READ));
1755 on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
1756 atomic_read(&osc->oo_nr_writes) > 0);
1758 on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
1759 atomic_read(&osc->oo_nr_reads) > 0);
1761 return osc_is_ready(osc);
1764 static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1768 spin_lock(&cli->cl_loi_list_lock);
1769 is_ready = __osc_list_maint(cli, osc);
1770 spin_unlock(&cli->cl_loi_list_lock);
1775 /* this is trying to propogate async writeback errors back up to the
1776 * application. As an async write fails we record the error code for later if
1777 * the app does an fsync. As long as errors persist we force future rpcs to be
1778 * sync so that the app can get a sync error and break the cycle of queueing
1779 * pages for which writeback will fail. */
1780 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
1787 ar->ar_force_sync = 1;
1788 ar->ar_min_xid = ptlrpc_sample_next_xid();
1793 if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
1794 ar->ar_force_sync = 0;
1797 /* this must be called holding the loi list lock to give coverage to exit_cache,
1798 * async_flag maintenance, and oap_request */
1799 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
1800 struct osc_async_page *oap, int sent, int rc)
1802 struct osc_object *osc = oap->oap_obj;
1803 struct lov_oinfo *loi = osc->oo_oinfo;
1807 if (oap->oap_request != NULL) {
1808 xid = ptlrpc_req_xid(oap->oap_request);
1809 ptlrpc_req_finished(oap->oap_request);
1810 oap->oap_request = NULL;
1813 /* As the transfer for this page is being done, clear the flags */
1814 spin_lock(&oap->oap_lock);
1815 oap->oap_async_flags = 0;
1816 spin_unlock(&oap->oap_lock);
1818 if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
1819 spin_lock(&cli->cl_loi_list_lock);
1820 osc_process_ar(&cli->cl_ar, xid, rc);
1821 osc_process_ar(&loi->loi_ar, xid, rc);
1822 spin_unlock(&cli->cl_loi_list_lock);
1825 rc = osc_completion(env, oap, oap->oap_cmd, rc);
1827 CERROR("completion on oap %p obj %p returns %d.\n",
1833 struct extent_rpc_data {
1834 struct list_head *erd_rpc_list;
1835 unsigned int erd_page_count;
1836 unsigned int erd_max_pages;
1837 unsigned int erd_max_chunks;
1838 unsigned int erd_max_extents;
1841 static inline unsigned osc_extent_chunks(const struct osc_extent *ext)
1843 struct client_obd *cli = osc_cli(ext->oe_obj);
1844 unsigned ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
1846 return (ext->oe_end >> ppc_bits) - (ext->oe_start >> ppc_bits) + 1;
1850 can_merge(const struct osc_extent *ext, const struct osc_extent *in_rpc)
1852 if (ext->oe_no_merge || in_rpc->oe_no_merge)
1855 if (ext->oe_srvlock != in_rpc->oe_srvlock)
1858 if (ext->oe_ndelay != in_rpc->oe_ndelay)
1861 if (!ext->oe_grants != !in_rpc->oe_grants)
1864 if (ext->oe_dio != in_rpc->oe_dio)
1867 /* It's possible to have overlap on DIO */
1868 if (in_rpc->oe_dio && overlapped(ext, in_rpc))
1875 * Try to add extent to one RPC. We need to think about the following things:
1876 * - # of pages must not be over max_pages_per_rpc
1877 * - extent must be compatible with previous ones
1879 static int try_to_add_extent_for_io(struct client_obd *cli,
1880 struct osc_extent *ext,
1881 struct extent_rpc_data *data)
1883 struct osc_extent *tmp;
1884 unsigned int chunk_count;
1887 EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
1889 OSC_EXTENT_DUMP(D_CACHE, ext, "trying to add this extent\n");
1891 if (data->erd_max_extents == 0)
1894 chunk_count = osc_extent_chunks(ext);
1895 EASSERTF(data->erd_page_count != 0 ||
1896 chunk_count <= data->erd_max_chunks, ext,
1897 "The first extent to be fit in a RPC contains %u chunks, "
1898 "which is over the limit %u.\n", chunk_count,
1899 data->erd_max_chunks);
1900 if (chunk_count > data->erd_max_chunks)
1903 data->erd_max_pages = max(ext->oe_mppr, data->erd_max_pages);
1904 EASSERTF(data->erd_page_count != 0 ||
1905 ext->oe_nr_pages <= data->erd_max_pages, ext,
1906 "The first extent to be fit in a RPC contains %u pages, "
1907 "which is over the limit %u.\n", ext->oe_nr_pages,
1908 data->erd_max_pages);
1909 if (data->erd_page_count + ext->oe_nr_pages > data->erd_max_pages)
1912 list_for_each_entry(tmp, data->erd_rpc_list, oe_link) {
1913 EASSERT(tmp->oe_owner == current, tmp);
1915 if (!can_merge(ext, tmp))
1919 data->erd_max_extents--;
1920 data->erd_max_chunks -= chunk_count;
1921 data->erd_page_count += ext->oe_nr_pages;
1922 list_move_tail(&ext->oe_link, data->erd_rpc_list);
1923 ext->oe_owner = current;
1928 * In order to prevent multiple ptlrpcd from breaking contiguous extents,
1929 * get_write_extent() takes all appropriate extents in atomic.
1931 * The following policy is used to collect extents for IO:
1932 * 1. Add as many HP extents as possible;
1933 * 2. Add the first urgent extent in urgent extent list and take it out of
1935 * 3. Add subsequent extents of this urgent extent;
1936 * 4. If urgent list is not empty, goto 2;
1937 * 5. Traverse the extent tree from the 1st extent;
1938 * 6. Above steps exit if there is no space in this RPC.
1940 static unsigned int get_write_extents(struct osc_object *obj,
1941 struct list_head *rpclist)
1943 struct client_obd *cli = osc_cli(obj);
1944 struct osc_extent *ext;
1945 struct extent_rpc_data data = {
1946 .erd_rpc_list = rpclist,
1947 .erd_page_count = 0,
1948 .erd_max_pages = cli->cl_max_pages_per_rpc,
1949 .erd_max_chunks = osc_max_write_chunks(cli),
1950 .erd_max_extents = 256,
1953 assert_osc_object_is_locked(obj);
1954 while (!list_empty(&obj->oo_hp_exts)) {
1955 ext = list_entry(obj->oo_hp_exts.next, struct osc_extent,
1957 LASSERT(ext->oe_state == OES_CACHE);
1958 if (!try_to_add_extent_for_io(cli, ext, &data))
1959 return data.erd_page_count;
1960 EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
1962 if (data.erd_page_count == data.erd_max_pages)
1963 return data.erd_page_count;
1965 while (!list_empty(&obj->oo_urgent_exts)) {
1966 ext = list_entry(obj->oo_urgent_exts.next,
1967 struct osc_extent, oe_link);
1968 if (!try_to_add_extent_for_io(cli, ext, &data))
1969 return data.erd_page_count;
1971 if (data.erd_page_count == data.erd_max_pages)
1972 return data.erd_page_count;
1974 /* One key difference between full extents and other extents: full
1975 * extents can usually only be added if the rpclist was empty, so if we
1976 * can't add one, we continue on to trying to add normal extents. This
1977 * is so we don't miss adding extra extents to an RPC containing high
1978 * priority or urgent extents. */
1979 while (!list_empty(&obj->oo_full_exts)) {
1980 ext = list_entry(obj->oo_full_exts.next,
1981 struct osc_extent, oe_link);
1982 if (!try_to_add_extent_for_io(cli, ext, &data))
1985 if (data.erd_page_count == data.erd_max_pages)
1986 return data.erd_page_count;
1988 for (ext = first_extent(obj);
1990 ext = next_extent(ext)) {
1991 if ((ext->oe_state != OES_CACHE) ||
1992 /* this extent may be already in current rpclist */
1993 (!list_empty(&ext->oe_link) && ext->oe_owner))
1996 if (!try_to_add_extent_for_io(cli, ext, &data))
1997 return data.erd_page_count;
1999 return data.erd_page_count;
2003 osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
2004 struct osc_object *osc)
2008 struct osc_extent *ext;
2009 struct osc_extent *tmp;
2010 struct osc_extent *first = NULL;
2011 unsigned int page_count = 0;
2016 assert_osc_object_is_locked(osc);
2018 page_count = get_write_extents(osc, &rpclist);
2019 LASSERT(equi(page_count == 0, list_empty(&rpclist)));
2021 if (list_empty(&rpclist))
2024 osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
2026 list_for_each_entry(ext, &rpclist, oe_link) {
2027 LASSERT(ext->oe_state == OES_CACHE ||
2028 ext->oe_state == OES_LOCK_DONE);
2029 if (ext->oe_state == OES_CACHE)
2030 osc_extent_state_set(ext, OES_LOCKING);
2032 osc_extent_state_set(ext, OES_RPC);
2035 /* we're going to grab page lock, so release object lock because
2036 * lock order is page lock -> object lock. */
2037 osc_object_unlock(osc);
2039 list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
2040 if (ext->oe_state == OES_LOCKING) {
2041 rc = osc_extent_make_ready(env, ext);
2042 if (unlikely(rc < 0)) {
2043 list_del_init(&ext->oe_link);
2044 osc_extent_finish(env, ext, 0, rc);
2048 if (first == NULL) {
2050 srvlock = ext->oe_srvlock;
2052 LASSERT(srvlock == ext->oe_srvlock);
2056 if (!list_empty(&rpclist)) {
2057 LASSERT(page_count > 0);
2058 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE);
2059 LASSERT(list_empty(&rpclist));
2062 osc_object_lock(osc);
2067 * prepare pages for ASYNC io and put pages in send queue.
2069 * \param cmd OBD_BRW_* macroses
2070 * \param lop pending pages
2072 * \return zero if no page added to send queue.
2073 * \return 1 if pages successfully added to send queue.
2074 * \return negative on errors.
2077 osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
2078 struct osc_object *osc)
2081 struct osc_extent *ext;
2082 struct osc_extent *next;
2084 struct extent_rpc_data data = {
2085 .erd_rpc_list = &rpclist,
2086 .erd_page_count = 0,
2087 .erd_max_pages = cli->cl_max_pages_per_rpc,
2088 .erd_max_chunks = UINT_MAX,
2089 .erd_max_extents = UINT_MAX,
2094 assert_osc_object_is_locked(osc);
2095 list_for_each_entry_safe(ext, next, &osc->oo_reading_exts, oe_link) {
2096 EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
2097 if (!try_to_add_extent_for_io(cli, ext, &data))
2099 osc_extent_state_set(ext, OES_RPC);
2100 EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
2102 LASSERT(data.erd_page_count <= data.erd_max_pages);
2104 osc_update_pending(osc, OBD_BRW_READ, -data.erd_page_count);
2106 if (!list_empty(&rpclist)) {
2107 osc_object_unlock(osc);
2109 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ);
2110 LASSERT(list_empty(&rpclist));
2112 osc_object_lock(osc);
2117 #define list_to_obj(list, item) ({ \
2118 struct list_head *__tmp = (list)->next; \
2119 list_del_init(__tmp); \
2120 list_entry(__tmp, struct osc_object, oo_##item); \
2123 /* This is called by osc_check_rpcs() to find which objects have pages that
2124 * we could be sending. These lists are maintained by osc_makes_rpc(). */
2125 static struct osc_object *osc_next_obj(struct client_obd *cli)
2129 /* First return objects that have blocked locks so that they
2130 * will be flushed quickly and other clients can get the lock,
2131 * then objects which have pages ready to be stuffed into RPCs */
2132 if (!list_empty(&cli->cl_loi_hp_ready_list))
2133 RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
2134 if (!list_empty(&cli->cl_loi_ready_list))
2135 RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
2137 /* then if we have cache waiters, return all objects with queued
2138 * writes. This is especially important when many small files
2139 * have filled up the cache and not been fired into rpcs because
2140 * they don't pass the nr_pending/object threshhold
2142 if (waitqueue_active(&cli->cl_cache_waiters) &&
2143 !list_empty(&cli->cl_loi_write_list))
2144 RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
2146 /* then return all queued objects when we have an invalid import
2147 * so that they get flushed */
2148 if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2149 if (!list_empty(&cli->cl_loi_write_list))
2150 RETURN(list_to_obj(&cli->cl_loi_write_list,
2152 if (!list_empty(&cli->cl_loi_read_list))
2153 RETURN(list_to_obj(&cli->cl_loi_read_list,
2159 /* called with the loi list lock held */
2160 static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2161 __must_hold(&cli->cl_loi_list_lock)
2163 struct osc_object *osc;
2167 while ((osc = osc_next_obj(cli)) != NULL) {
2168 struct cl_object *obj = osc2cl(osc);
2169 struct lu_ref_link link;
2171 OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
2173 /* even if we have reached our max in flight RPCs, we still
2174 * allow all high-priority RPCs through to prevent their
2175 * starvation and leading to server evicting us for not
2176 * writing out pages in a timely manner LU-13131 */
2177 if (osc_max_rpc_in_flight(cli, osc) &&
2178 list_empty(&osc->oo_hp_exts)) {
2179 __osc_list_maint(cli, osc);
2184 spin_unlock(&cli->cl_loi_list_lock);
2185 lu_object_ref_add_at(&obj->co_lu, &link, "check", current);
2187 /* attempt some read/write balancing by alternating between
2188 * reads and writes in an object. The makes_rpc checks here
2189 * would be redundant if we were getting read/write work items
2190 * instead of objects. we don't want send_oap_rpc to drain a
2191 * partial read pending queue when we're given this object to
2192 * do io on writes while there are cache waiters */
2193 osc_object_lock(osc);
2194 if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
2195 rc = osc_send_write_rpc(env, cli, osc);
2197 CERROR("Write request failed with %d\n", rc);
2199 /* osc_send_write_rpc failed, mostly because of
2202 * It can't break here, because if:
2203 * - a page was submitted by osc_io_submit, so
2205 * - no request in flight
2206 * - no subsequent request
2207 * The system will be in live-lock state,
2208 * because there is no chance to call
2209 * osc_io_unplug() and osc_check_rpcs() any
2210 * more. pdflush can't help in this case,
2211 * because it might be blocked at grabbing
2212 * the page lock as we mentioned.
2214 * Anyway, continue to drain pages. */
2218 if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
2219 rc = osc_send_read_rpc(env, cli, osc);
2221 CERROR("Read request failed with %d\n", rc);
2223 osc_object_unlock(osc);
2225 osc_list_maint(cli, osc);
2226 lu_object_ref_del_at(&obj->co_lu, &link, "check", current);
2227 cl_object_put(env, obj);
2229 spin_lock(&cli->cl_loi_list_lock);
2233 int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
2234 struct osc_object *osc, int async)
2238 if (osc != NULL && osc_list_maint(cli, osc) == 0)
2242 spin_lock(&cli->cl_loi_list_lock);
2243 osc_check_rpcs(env, cli);
2244 spin_unlock(&cli->cl_loi_list_lock);
2246 CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli);
2247 LASSERT(cli->cl_writeback_work != NULL);
2248 rc = ptlrpcd_queue_work(cli->cl_writeback_work);
2252 EXPORT_SYMBOL(osc_io_unplug0);
2254 int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
2255 struct page *page, loff_t offset)
2257 struct obd_export *exp = osc_export(osc);
2258 struct osc_async_page *oap = &ops->ops_oap;
2262 return cfs_size_round(sizeof(*oap));
2264 oap->oap_magic = OAP_MAGIC;
2265 oap->oap_cli = &exp->exp_obd->u.cli;
2268 oap->oap_page = page;
2269 oap->oap_obj_off = offset;
2270 LASSERT(!(offset & ~PAGE_MASK));
2272 INIT_LIST_HEAD(&oap->oap_pending_item);
2273 INIT_LIST_HEAD(&oap->oap_rpc_item);
2275 spin_lock_init(&oap->oap_lock);
2276 CDEBUG(D_INFO, "oap %p page %p obj off %llu\n",
2277 oap, page, oap->oap_obj_off);
2280 EXPORT_SYMBOL(osc_prep_async_page);
2282 int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
2283 struct osc_page *ops, cl_commit_cbt cb)
2285 struct osc_io *oio = osc_env_io(env);
2286 struct osc_extent *ext = NULL;
2287 struct osc_async_page *oap = &ops->ops_oap;
2288 struct client_obd *cli = oap->oap_cli;
2289 struct osc_object *osc = oap->oap_obj;
2290 struct pagevec *pvec = &osc_env_info(env)->oti_pagevec;
2293 unsigned int grants = 0;
2294 u32 brw_flags = OBD_BRW_ASYNC;
2295 int cmd = OBD_BRW_WRITE;
2296 int need_release = 0;
2300 if (oap->oap_magic != OAP_MAGIC)
2303 if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2306 if (!list_empty(&oap->oap_pending_item) ||
2307 !list_empty(&oap->oap_rpc_item))
2310 /* Set the OBD_BRW_SRVLOCK before the page is queued. */
2311 brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
2312 if (oio->oi_cap_sys_resource || io->ci_noquota) {
2313 brw_flags |= OBD_BRW_NOQUOTA;
2314 cmd |= OBD_BRW_NOQUOTA;
2317 /* check if the file's owner/group is over quota */
2318 if (!(cmd & OBD_BRW_NOQUOTA)) {
2319 struct cl_object *obj;
2320 struct cl_attr *attr;
2321 unsigned int qid[LL_MAXQUOTAS];
2323 obj = cl_object_top(&osc->oo_cl);
2324 attr = &osc_env_info(env)->oti_attr;
2326 cl_object_attr_lock(obj);
2327 rc = cl_object_attr_get(env, obj, attr);
2328 cl_object_attr_unlock(obj);
2330 qid[USRQUOTA] = attr->cat_uid;
2331 qid[GRPQUOTA] = attr->cat_gid;
2332 qid[PRJQUOTA] = attr->cat_projid;
2333 if (rc == 0 && osc_quota_chkdq(cli, qid) == -EDQUOT)
2340 oap->oap_page_off = ops->ops_from;
2341 oap->oap_count = ops->ops_to - ops->ops_from;
2342 /* No need to hold a lock here,
2343 * since this page is not in any list yet. */
2344 oap->oap_async_flags = 0;
2345 oap->oap_brw_flags = brw_flags;
2347 OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
2348 oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
2350 index = osc_index(oap2osc(oap));
2352 /* Add this page into extent by the following steps:
2353 * 1. if there exists an active extent for this IO, mostly this page
2354 * can be added to the active extent and sometimes we need to
2355 * expand extent to accomodate this page;
2356 * 2. otherwise, a new extent will be allocated. */
2358 ext = oio->oi_active;
2359 if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) {
2360 /* one chunk plus extent overhead must be enough to write this
2362 grants = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
2363 if (ext->oe_end >= index)
2366 /* it doesn't need any grant to dirty this page */
2367 spin_lock(&cli->cl_loi_list_lock);
2368 rc = osc_enter_cache_try(cli, oap, grants);
2369 if (rc == 0) { /* try failed */
2372 } else if (ext->oe_end < index) {
2374 /* try to expand this extent */
2375 rc = osc_extent_expand(ext, index, &tmp);
2378 /* don't free reserved grant */
2380 OSC_EXTENT_DUMP(D_CACHE, ext,
2381 "expanded for %lu.\n", index);
2382 osc_unreserve_grant_nolock(cli, grants, tmp);
2386 spin_unlock(&cli->cl_loi_list_lock);
2388 } else if (ext != NULL) {
2389 /* index is located outside of active extent */
2393 osc_extent_release(env, ext);
2394 oio->oi_active = NULL;
2399 tmp = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
2401 /* try to find new extent to cover this page */
2402 LASSERT(oio->oi_active == NULL);
2403 /* we may have allocated grant for this page if we failed
2404 * to expand the previous active extent. */
2405 LASSERT(ergo(grants > 0, grants >= tmp));
2409 /* We haven't allocated grant for this page, and we
2410 * must not hold a page lock while we do enter_cache,
2411 * so we must mark dirty & unlock any pages in the
2412 * write commit pagevec. */
2413 if (pagevec_count(pvec)) {
2415 pagevec_reinit(pvec);
2417 rc = osc_enter_cache(env, cli, oap, tmp);
2424 ext = osc_extent_find(env, osc, index, &tmp);
2426 LASSERT(tmp == grants);
2427 osc_exit_cache(cli, oap);
2431 oio->oi_active = ext;
2435 osc_unreserve_grant(cli, grants, tmp);
2438 LASSERT(ergo(rc == 0, ext != NULL));
2440 EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
2441 ext, "index = %lu.\n", index);
2442 LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
2444 osc_object_lock(osc);
2445 if (ext->oe_nr_pages == 0)
2446 ext->oe_srvlock = ops->ops_srvlock;
2448 LASSERT(ext->oe_srvlock == ops->ops_srvlock);
2450 list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
2451 osc_object_unlock(osc);
2453 if (!ext->oe_layout_version)
2454 ext->oe_layout_version = io->ci_layout_version;
2460 int osc_teardown_async_page(const struct lu_env *env,
2461 struct osc_object *obj, struct osc_page *ops)
2463 struct osc_async_page *oap = &ops->ops_oap;
2467 LASSERT(oap->oap_magic == OAP_MAGIC);
2469 CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
2470 oap, ops, osc_index(oap2osc(oap)));
2472 if (!list_empty(&oap->oap_rpc_item)) {
2473 CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
2475 } else if (!list_empty(&oap->oap_pending_item)) {
2476 struct osc_extent *ext = NULL;
2478 osc_object_lock(obj);
2479 ext = osc_extent_lookup(obj, osc_index(oap2osc(oap)));
2480 osc_object_unlock(obj);
2481 /* only truncated pages are allowed to be taken out.
2482 * See osc_extent_truncate() and osc_cache_truncate_start()
2484 if (ext != NULL && ext->oe_state != OES_TRUNC) {
2485 OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
2486 osc_index(oap2osc(oap)));
2490 osc_extent_put(env, ext);
2496 * This is called when a page is picked up by kernel to write out.
2498 * We should find out the corresponding extent and add the whole extent
2499 * into urgent list. The extent may be being truncated or used, handle it
2502 int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
2503 struct osc_page *ops)
2505 struct osc_extent *ext = NULL;
2506 struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
2507 struct cl_page *cp = ops->ops_cl.cpl_page;
2508 pgoff_t index = osc_index(ops);
2509 struct osc_async_page *oap = &ops->ops_oap;
2510 bool unplug = false;
2514 osc_object_lock(obj);
2515 ext = osc_extent_lookup(obj, index);
2517 osc_extent_tree_dump(D_ERROR, obj);
2518 LASSERTF(0, "page index %lu is NOT covered.\n", index);
2521 switch (ext->oe_state) {
2524 CL_PAGE_DEBUG(D_ERROR, env, cp, "flush an in-rpc page?\n");
2528 /* If we know this extent is being written out, we should abort
2529 * so that the writer can make this page ready. Otherwise, there
2530 * exists a deadlock problem because other process can wait for
2531 * page writeback bit holding page lock; and meanwhile in
2532 * vvp_page_make_ready(), we need to grab page lock before
2533 * really sending the RPC. */
2535 /* race with truncate, page will be redirtied */
2537 /* The extent is active so we need to abort and let the caller
2538 * re-dirty the page. If we continued on here, and we were the
2539 * one making the extent active, we could deadlock waiting for
2540 * the page writeback to clear but it won't because the extent
2541 * is active and won't be written out. */
2542 GOTO(out, rc = -EAGAIN);
2547 rc = cl_page_prep(env, io, cp, CRT_WRITE);
2551 spin_lock(&oap->oap_lock);
2552 oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
2553 spin_unlock(&oap->oap_lock);
2555 if (memory_pressure_get())
2556 ext->oe_memalloc = 1;
2559 if (ext->oe_state == OES_CACHE) {
2560 OSC_EXTENT_DUMP(D_CACHE, ext,
2561 "flush page %p make it urgent.\n", oap);
2562 if (list_empty(&ext->oe_link))
2563 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2570 osc_object_unlock(obj);
2571 osc_extent_put(env, ext);
2573 osc_io_unplug_async(env, osc_cli(obj), obj);
2577 int osc_queue_sync_pages(const struct lu_env *env, const struct cl_io *io,
2578 struct osc_object *obj, struct list_head *list,
2581 struct client_obd *cli = osc_cli(obj);
2582 struct osc_extent *ext;
2583 struct osc_async_page *oap;
2585 int mppr = cli->cl_max_pages_per_rpc;
2586 bool can_merge = true;
2587 pgoff_t start = CL_PAGE_EOF;
2591 list_for_each_entry(oap, list, oap_pending_item) {
2592 struct osc_page *opg = oap2osc_page(oap);
2593 pgoff_t index = osc_index(opg);
2600 mppr <<= (page_count > mppr);
2602 if (unlikely(opg->ops_from > 0 || opg->ops_to < PAGE_SIZE))
2606 ext = osc_extent_alloc(obj);
2608 struct osc_async_page *tmp;
2610 list_for_each_entry_safe(oap, tmp, list, oap_pending_item) {
2611 list_del_init(&oap->oap_pending_item);
2612 osc_ap_completion(env, cli, oap, 0, -ENOMEM);
2617 ext->oe_rw = !!(brw_flags & OBD_BRW_READ);
2619 ext->oe_no_merge = !can_merge;
2621 ext->oe_start = start;
2622 ext->oe_end = ext->oe_max_end = end;
2624 ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
2625 ext->oe_ndelay = !!(brw_flags & OBD_BRW_NDELAY);
2626 ext->oe_dio = !!(brw_flags & OBD_BRW_NOCACHE);
2627 ext->oe_nr_pages = page_count;
2628 ext->oe_mppr = mppr;
2629 list_splice_init(list, &ext->oe_pages);
2630 ext->oe_layout_version = io->ci_layout_version;
2632 osc_object_lock(obj);
2633 /* Reuse the initial refcount for RPC, don't drop it */
2634 osc_extent_state_set(ext, OES_LOCK_DONE);
2635 if (!ext->oe_rw) { /* write */
2636 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2637 osc_update_pending(obj, OBD_BRW_WRITE, page_count);
2639 list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
2640 osc_update_pending(obj, OBD_BRW_READ, page_count);
2642 osc_object_unlock(obj);
2644 osc_io_unplug_async(env, cli, obj);
2649 * Called by osc_io_setattr_start() to freeze and destroy covering extents.
2651 int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
2652 __u64 size, struct osc_extent **extp)
2654 struct client_obd *cli = osc_cli(obj);
2655 struct osc_extent *ext;
2656 struct osc_extent *waiting = NULL;
2663 /* pages with index greater or equal to index will be truncated. */
2664 index = cl_index(osc2cl(obj), size);
2665 partial = size > cl_offset(osc2cl(obj), index);
2668 osc_object_lock(obj);
2669 ext = osc_extent_search(obj, index);
2671 ext = first_extent(obj);
2672 else if (ext->oe_end < index)
2673 ext = next_extent(ext);
2674 while (ext != NULL) {
2675 EASSERT(ext->oe_state != OES_TRUNC, ext);
2677 if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
2678 /* if ext is in urgent state, it means there must exist
2679 * a page already having been flushed by write_page().
2680 * We have to wait for this extent because we can't
2681 * truncate that page. */
2682 OSC_EXTENT_DUMP(D_CACHE, ext,
2683 "waiting for busy extent\n");
2684 waiting = osc_extent_get(ext);
2688 OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:%llu.\n", size);
2690 osc_extent_get(ext);
2691 if (ext->oe_state == OES_ACTIVE) {
2692 /* though we grab inode mutex for write path, but we
2693 * release it before releasing extent(in osc_io_end()),
2694 * so there is a race window that an extent is still
2695 * in OES_ACTIVE when truncate starts. */
2696 LASSERT(!ext->oe_trunc_pending);
2697 ext->oe_trunc_pending = 1;
2699 EASSERT(ext->oe_state == OES_CACHE, ext);
2700 osc_extent_state_set(ext, OES_TRUNC);
2701 osc_update_pending(obj, OBD_BRW_WRITE,
2704 /* This extent could be on the full extents list, that's OK */
2705 EASSERT(!ext->oe_hp && !ext->oe_urgent, ext);
2706 if (!list_empty(&ext->oe_link))
2707 list_move_tail(&ext->oe_link, &list);
2709 list_add_tail(&ext->oe_link, &list);
2711 ext = next_extent(ext);
2713 osc_object_unlock(obj);
2715 osc_list_maint(cli, obj);
2717 while (!list_empty(&list)) {
2720 ext = list_entry(list.next, struct osc_extent, oe_link);
2721 list_del_init(&ext->oe_link);
2723 /* extent may be in OES_ACTIVE state because inode mutex
2724 * is released before osc_io_end() in file write case */
2725 if (ext->oe_state != OES_TRUNC)
2726 osc_extent_wait(env, ext, OES_TRUNC);
2728 rc = osc_extent_truncate(ext, index, partial);
2733 OSC_EXTENT_DUMP(D_ERROR, ext,
2734 "truncate error %d\n", rc);
2735 } else if (ext->oe_nr_pages == 0) {
2736 osc_extent_remove(ext);
2738 /* this must be an overlapped extent which means only
2739 * part of pages in this extent have been truncated.
2741 EASSERTF(ext->oe_start <= index, ext,
2742 "trunc index = %lu/%d.\n", index, partial);
2743 /* fix index to skip this partially truncated extent */
2744 index = ext->oe_end + 1;
2747 /* we need to hold this extent in OES_TRUNC state so
2748 * that no writeback will happen. This is to avoid
2750 * Only partial truncate can reach here, if @size is
2751 * not zero, the caller should provide a valid @extp. */
2752 LASSERT(*extp == NULL);
2753 *extp = osc_extent_get(ext);
2754 OSC_EXTENT_DUMP(D_CACHE, ext,
2755 "trunc at %llu\n", size);
2757 osc_extent_put(env, ext);
2759 if (waiting != NULL) {
2762 /* ignore the result of osc_extent_wait the write initiator
2763 * should take care of it. */
2764 rc = osc_extent_wait(env, waiting, OES_INV);
2766 OSC_EXTENT_DUMP(D_CACHE, waiting, "error: %d.\n", rc);
2768 osc_extent_put(env, waiting);
2774 EXPORT_SYMBOL(osc_cache_truncate_start);
2777 * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
2779 void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext)
2782 struct osc_object *obj = ext->oe_obj;
2783 bool unplug = false;
2785 EASSERT(ext->oe_nr_pages > 0, ext);
2786 EASSERT(ext->oe_state == OES_TRUNC, ext);
2787 EASSERT(!ext->oe_urgent, ext);
2789 OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
2790 osc_object_lock(obj);
2791 osc_extent_state_set(ext, OES_CACHE);
2792 if (ext->oe_fsync_wait && !ext->oe_urgent) {
2794 list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
2797 osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
2798 osc_object_unlock(obj);
2799 osc_extent_put(env, ext);
2802 osc_io_unplug_async(env, osc_cli(obj), obj);
2807 * Wait for extents in a specific range to be written out.
2808 * The caller must have called osc_cache_writeback_range() to issue IO
2809 * otherwise it will take a long time for this function to finish.
2811 * Caller must hold inode_mutex , or cancel exclusive dlm lock so that
2812 * nobody else can dirty this range of file while we're waiting for
2813 * extents to be written.
2815 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
2816 pgoff_t start, pgoff_t end)
2818 struct osc_extent *ext;
2819 pgoff_t index = start;
2824 osc_object_lock(obj);
2825 ext = osc_extent_search(obj, index);
2827 ext = first_extent(obj);
2828 else if (ext->oe_end < index)
2829 ext = next_extent(ext);
2830 while (ext != NULL) {
2833 if (ext->oe_start > end)
2836 if (!ext->oe_fsync_wait) {
2837 ext = next_extent(ext);
2841 EASSERT(ergo(ext->oe_state == OES_CACHE,
2842 ext->oe_hp || ext->oe_urgent), ext);
2843 EASSERT(ergo(ext->oe_state == OES_ACTIVE,
2844 !ext->oe_hp && ext->oe_urgent), ext);
2846 index = ext->oe_end + 1;
2847 osc_extent_get(ext);
2848 osc_object_unlock(obj);
2850 rc = osc_extent_wait(env, ext, OES_INV);
2853 osc_extent_put(env, ext);
2856 osc_object_unlock(obj);
2858 OSC_IO_DEBUG(obj, "sync file range.\n");
2861 EXPORT_SYMBOL(osc_cache_wait_range);
2864 * Called to write out a range of osc object.
2866 * @hp : should be set this is caused by lock cancel;
2867 * @discard: is set if dirty pages should be dropped - file will be deleted or
2868 * truncated, this implies there is no partially discarding extents.
2870 * Return how many pages will be issued, or error code if error occurred.
2872 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
2873 pgoff_t start, pgoff_t end, int hp, int discard)
2875 struct osc_extent *ext;
2876 LIST_HEAD(discard_list);
2877 bool unplug = false;
2881 osc_object_lock(obj);
2882 ext = osc_extent_search(obj, start);
2884 ext = first_extent(obj);
2885 else if (ext->oe_end < start)
2886 ext = next_extent(ext);
2887 while (ext != NULL) {
2888 if (ext->oe_start > end)
2891 ext->oe_fsync_wait = 1;
2892 switch (ext->oe_state) {
2894 result += ext->oe_nr_pages;
2896 struct list_head *list = NULL;
2898 EASSERT(!ext->oe_hp, ext);
2900 list = &obj->oo_hp_exts;
2901 } else if (!ext->oe_urgent && !ext->oe_hp) {
2903 list = &obj->oo_urgent_exts;
2906 list_move_tail(&ext->oe_link, list);
2909 struct client_obd *cli = osc_cli(obj);
2910 int pcc_bits = cli->cl_chunkbits - PAGE_SHIFT;
2911 pgoff_t align_by = (1 << pcc_bits);
2912 pgoff_t a_start = round_down(start, align_by);
2913 pgoff_t a_end = round_up(end, align_by);
2917 a_end = CL_PAGE_EOF;
2918 /* the only discarder is lock cancelling, so
2919 * [start, end], aligned by chunk size, must
2920 * contain this extent */
2921 LASSERTF(ext->oe_start >= a_start &&
2922 ext->oe_end <= a_end,
2923 "ext [%lu, %lu] reg [%lu, %lu] "
2924 "orig [%lu %lu] align %lu bits "
2925 "%d\n", ext->oe_start, ext->oe_end,
2926 a_start, a_end, start, end,
2927 align_by, pcc_bits);
2928 osc_extent_state_set(ext, OES_LOCKING);
2929 ext->oe_owner = current;
2930 list_move_tail(&ext->oe_link,
2932 osc_update_pending(obj, OBD_BRW_WRITE,
2937 /* It's pretty bad to wait for ACTIVE extents, because
2938 * we don't know how long we will wait for it to be
2939 * flushed since it may be blocked at awaiting more
2940 * grants. We do this for the correctness of fsync. */
2941 LASSERT(hp == 0 && discard == 0);
2945 /* this extent is being truncated, can't do anything
2946 * for it now. it will be set to urgent after truncate
2947 * is finished in osc_cache_truncate_end(). */
2951 ext = next_extent(ext);
2953 osc_object_unlock(obj);
2955 LASSERT(ergo(!discard, list_empty(&discard_list)));
2956 if (!list_empty(&discard_list)) {
2957 struct osc_extent *tmp;
2960 osc_list_maint(osc_cli(obj), obj);
2961 list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
2962 list_del_init(&ext->oe_link);
2963 EASSERT(ext->oe_state == OES_LOCKING, ext);
2965 /* Discard caching pages. We don't actually write this
2966 * extent out but we complete it as if we did. */
2967 rc = osc_extent_make_ready(env, ext);
2968 if (unlikely(rc < 0)) {
2969 OSC_EXTENT_DUMP(D_ERROR, ext,
2970 "make_ready returned %d\n", rc);
2975 /* finish the extent as if the pages were sent */
2976 osc_extent_finish(env, ext, 0, 0);
2981 osc_io_unplug(env, osc_cli(obj), obj);
2983 if (hp || discard) {
2985 rc = osc_cache_wait_range(env, obj, start, end);
2986 if (result >= 0 && rc < 0)
2990 OSC_IO_DEBUG(obj, "pageout [%lu, %lu], %d.\n", start, end, result);
2993 EXPORT_SYMBOL(osc_cache_writeback_range);
2996 * Returns a list of pages by a given [start, end] of \a obj.
2998 * Gang tree lookup (radix_tree_gang_lookup()) optimization is absolutely
2999 * crucial in the face of [offset, EOF] locks.
3001 * Return at least one page in @queue unless there is no covered page.
3003 bool osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
3004 struct osc_object *osc, pgoff_t start, pgoff_t end,
3005 osc_page_gang_cbt cb, void *cbdata)
3007 struct osc_page *ops;
3008 struct pagevec *pagevec;
3015 bool tree_lock = true;
3019 pvec = osc_env_info(env)->oti_pvec;
3020 pagevec = &osc_env_info(env)->oti_pagevec;
3021 ll_pagevec_init(pagevec, 0);
3022 spin_lock(&osc->oo_tree_lock);
3023 while ((nr = radix_tree_gang_lookup(&osc->oo_tree, pvec,
3024 idx, OTI_PVEC_SIZE)) > 0) {
3025 struct cl_page *page;
3026 bool end_of_region = false;
3028 for (i = 0, j = 0; i < nr; ++i) {
3032 idx = osc_index(ops);
3034 end_of_region = true;
3038 page = ops->ops_cl.cpl_page;
3039 LASSERT(page->cp_type == CPT_CACHEABLE);
3040 if (page->cp_state == CPS_FREEING)
3044 lu_ref_add_atomic(&page->cp_reference,
3045 "gang_lookup", current);
3051 * Here a delicate locking dance is performed. Current thread
3052 * holds a reference to a page, but has to own it before it
3053 * can be placed into queue. Owning implies waiting, so
3054 * radix-tree lock is to be released. After a wait one has to
3055 * check that pages weren't truncated (cl_page_own() returns
3056 * error in the latter case).
3058 spin_unlock(&osc->oo_tree_lock);
3061 for (i = 0; i < j; ++i) {
3064 res = (*cb)(env, io, ops, cbdata);
3066 page = ops->ops_cl.cpl_page;
3067 lu_ref_del(&page->cp_reference, "gang_lookup", current);
3068 cl_pagevec_put(env, page, pagevec);
3070 pagevec_release(pagevec);
3072 if (nr < OTI_PVEC_SIZE || end_of_region)
3080 spin_lock(&osc->oo_tree_lock);
3084 spin_unlock(&osc->oo_tree_lock);
3087 EXPORT_SYMBOL(osc_page_gang_lookup);
3090 * Check if page @page is covered by an extra lock or discard it.
3092 static bool check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
3093 struct osc_page *ops, void *cbdata)
3095 struct osc_thread_info *info = osc_env_info(env);
3096 struct osc_object *osc = cbdata;
3099 index = osc_index(ops);
3100 if (index >= info->oti_fn_index) {
3101 struct ldlm_lock *tmp;
3102 struct cl_page *page = ops->ops_cl.cpl_page;
3104 /* refresh non-overlapped index */
3105 tmp = osc_dlmlock_at_pgoff(env, osc, index,
3106 OSC_DAP_FL_TEST_LOCK);
3108 __u64 end = tmp->l_policy_data.l_extent.end;
3109 /* Cache the first-non-overlapped index so as to skip
3110 * all pages within [index, oti_fn_index). This is safe
3111 * because if tmp lock is canceled, it will discard
3113 info->oti_fn_index = cl_index(osc2cl(osc), end + 1);
3114 if (end == OBD_OBJECT_EOF)
3115 info->oti_fn_index = CL_PAGE_EOF;
3117 } else if (cl_page_own(env, io, page) == 0) {
3118 /* discard the page */
3119 cl_page_discard(env, io, page);
3120 cl_page_disown(env, io, page);
3122 LASSERT(page->cp_state == CPS_FREEING);
3126 info->oti_next_index = index + 1;
3130 bool osc_discard_cb(const struct lu_env *env, struct cl_io *io,
3131 struct osc_page *ops, void *cbdata)
3133 struct osc_thread_info *info = osc_env_info(env);
3134 struct cl_page *page = ops->ops_cl.cpl_page;
3136 /* page is top page. */
3137 info->oti_next_index = osc_index(ops) + 1;
3138 if (cl_page_own(env, io, page) == 0) {
3139 if (!ergo(page->cp_type == CPT_CACHEABLE,
3140 !PageDirty(cl_page_vmpage(page))))
3141 CL_PAGE_DEBUG(D_ERROR, env, page,
3142 "discard dirty page?\n");
3144 /* discard the page */
3145 cl_page_discard(env, io, page);
3146 cl_page_disown(env, io, page);
3148 LASSERT(page->cp_state == CPS_FREEING);
3153 EXPORT_SYMBOL(osc_discard_cb);
3156 * Discard pages protected by the given lock. This function traverses radix
3157 * tree to find all covering pages and discard them. If a page is being covered
3158 * by other locks, it should remain in cache.
3160 * If error happens on any step, the process continues anyway (the reasoning
3161 * behind this being that lock cancellation cannot be delayed indefinitely).
3163 int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
3164 pgoff_t start, pgoff_t end, bool discard)
3166 struct osc_thread_info *info = osc_env_info(env);
3167 struct cl_io *io = osc_env_thread_io(env);
3168 osc_page_gang_cbt cb;
3173 io->ci_obj = cl_object_top(osc2cl(osc));
3174 io->ci_ignore_layout = 1;
3175 result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
3179 cb = discard ? osc_discard_cb : check_and_discard_cb;
3180 info->oti_fn_index = info->oti_next_index = start;
3182 osc_page_gang_lookup(env, io, osc,
3183 info->oti_next_index, end, cb, osc);
3185 cl_io_fini(env, io);