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 if (!osc_object_is_locked(obj))
190 if (ext->oe_state >= OES_STATE_MAX)
193 if (atomic_read(&ext->oe_refc) <= 0)
196 if (atomic_read(&ext->oe_refc) < atomic_read(&ext->oe_users))
199 switch (ext->oe_state) {
201 if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
206 if (atomic_read(&ext->oe_users) == 0)
210 if (ext->oe_fsync_wait && !ext->oe_urgent)
214 if (ext->oe_grants == 0)
216 if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp)
220 if (atomic_read(&ext->oe_users) > 0)
224 if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start)
227 if (ext->oe_sync && ext->oe_grants > 0)
230 if (ext->oe_dlmlock != NULL &&
231 ext->oe_dlmlock->l_resource->lr_type == LDLM_EXTENT &&
232 !ldlm_is_failed(ext->oe_dlmlock)) {
233 struct ldlm_extent *extent;
235 extent = &ext->oe_dlmlock->l_policy_data.l_extent;
236 if (!(extent->start <= cl_offset(osc2cl(obj), ext->oe_start) &&
237 extent->end >= cl_offset(osc2cl(obj), ext->oe_max_end)))
240 if (!(ext->oe_dlmlock->l_granted_mode & (LCK_PW | LCK_GROUP)))
244 if (ext->oe_nr_pages > ext->oe_mppr)
247 /* Do not verify page list if extent is in RPC. This is because an
248 * in-RPC extent is supposed to be exclusively accessible w/o lock. */
249 if (ext->oe_state > OES_CACHE)
256 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
257 pgoff_t index = osc_index(oap2osc(oap));
259 if (index > ext->oe_end || index < ext->oe_start)
262 if (page_count != ext->oe_nr_pages)
267 OSC_EXTENT_DUMP_WITH_LOC(__FILE__, func, line, D_ERROR, ext,
268 "sanity check %p failed: rc = %d\n",
273 #define sanity_check_nolock(ext) \
274 osc_extent_sanity_check0(ext, __func__, __LINE__)
276 #define sanity_check(ext) ({ \
278 osc_object_lock((ext)->oe_obj); \
279 __res = sanity_check_nolock(ext); \
280 osc_object_unlock((ext)->oe_obj); \
286 * sanity check - to make sure there is no overlapped extent in the tree.
288 static int osc_extent_is_overlapped(struct osc_object *obj,
289 struct osc_extent *ext)
291 struct osc_extent *tmp;
293 LASSERT(osc_object_is_locked(obj));
298 for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) {
301 if (tmp->oe_end >= ext->oe_start &&
302 tmp->oe_start <= ext->oe_end)
308 static void osc_extent_state_set(struct osc_extent *ext, int state)
310 LASSERT(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 ext->oe_state = state;
318 wake_up_all(&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 atomic_set(&ext->oe_refc, 1);
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 osc_extent *ext)
345 OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
348 static struct osc_extent *osc_extent_get(struct osc_extent *ext)
350 LASSERT(atomic_read(&ext->oe_refc) >= 0);
351 atomic_inc(&ext->oe_refc);
355 static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
357 LASSERT(atomic_read(&ext->oe_refc) > 0);
358 if (atomic_dec_and_test(&ext->oe_refc)) {
359 LASSERT(list_empty(&ext->oe_link));
360 LASSERT(atomic_read(&ext->oe_users) == 0);
361 LASSERT(ext->oe_state == OES_INV);
362 LASSERT(!ext->oe_intree);
364 if (ext->oe_dlmlock != NULL) {
365 lu_ref_add(&ext->oe_dlmlock->l_reference,
367 LDLM_LOCK_PUT(ext->oe_dlmlock);
368 ext->oe_dlmlock = NULL;
370 cl_object_put(env, osc2cl(ext->oe_obj));
371 osc_extent_free(ext);
376 * osc_extent_put_trust() is a special version of osc_extent_put() when
377 * it's known that the caller is not the last user. This is to address the
378 * problem of lacking of lu_env ;-).
380 static void osc_extent_put_trust(struct osc_extent *ext)
382 LASSERT(atomic_read(&ext->oe_refc) > 1);
383 LASSERT(osc_object_is_locked(ext->oe_obj));
384 atomic_dec(&ext->oe_refc);
388 * Return the extent which includes pgoff @index, or return the greatest
389 * previous extent in the tree.
391 static struct osc_extent *osc_extent_search(struct osc_object *obj,
394 struct rb_node *n = obj->oo_root.rb_node;
395 struct osc_extent *tmp, *p = NULL;
397 LASSERT(osc_object_is_locked(obj));
400 if (index < tmp->oe_start) {
402 } else if (index > tmp->oe_end) {
413 * Return the extent covering @index, otherwise return NULL.
414 * caller must have held object lock.
416 static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
419 struct osc_extent *ext;
421 ext = osc_extent_search(obj, index);
422 if (ext != NULL && ext->oe_start <= index && index <= ext->oe_end)
423 return osc_extent_get(ext);
427 /* caller must have held object lock. */
428 static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
430 struct rb_node **n = &obj->oo_root.rb_node;
431 struct rb_node *parent = NULL;
432 struct osc_extent *tmp;
434 LASSERT(ext->oe_intree == 0);
435 LASSERT(ext->oe_obj == obj);
436 LASSERT(osc_object_is_locked(obj));
441 if (ext->oe_end < tmp->oe_start)
443 else if (ext->oe_start > tmp->oe_end)
446 EASSERTF(0, tmp, EXTSTR"\n", EXTPARA(ext));
448 rb_link_node(&ext->oe_node, parent, n);
449 rb_insert_color(&ext->oe_node, &obj->oo_root);
454 /* caller must have held object lock. */
455 static void osc_extent_erase(struct osc_extent *ext)
457 struct osc_object *obj = ext->oe_obj;
458 LASSERT(osc_object_is_locked(obj));
459 if (ext->oe_intree) {
460 rb_erase(&ext->oe_node, &obj->oo_root);
462 /* rbtree held a refcount */
463 osc_extent_put_trust(ext);
467 static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
469 struct osc_object *obj = ext->oe_obj;
471 LASSERT(osc_object_is_locked(obj));
472 LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE);
473 if (ext->oe_state == OES_CACHE) {
474 osc_extent_state_set(ext, OES_ACTIVE);
475 osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages);
477 atomic_inc(&ext->oe_users);
478 list_del_init(&ext->oe_link);
479 return osc_extent_get(ext);
482 static void __osc_extent_remove(struct osc_extent *ext)
484 LASSERT(osc_object_is_locked(ext->oe_obj));
485 LASSERT(list_empty(&ext->oe_pages));
486 osc_extent_erase(ext);
487 list_del_init(&ext->oe_link);
488 osc_extent_state_set(ext, OES_INV);
489 OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
492 static void osc_extent_remove(struct osc_extent *ext)
494 struct osc_object *obj = ext->oe_obj;
496 osc_object_lock(obj);
497 __osc_extent_remove(ext);
498 osc_object_unlock(obj);
502 * This function is used to merge extents to get better performance. It checks
503 * if @cur and @victim are contiguous at block level.
505 static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
506 struct osc_extent *victim)
508 struct osc_object *obj = cur->oe_obj;
509 struct client_obd *cli = osc_cli(obj);
514 LASSERT(cur->oe_state == OES_CACHE);
515 LASSERT(osc_object_is_locked(obj));
519 if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
522 if (cur->oe_max_end != victim->oe_max_end)
525 LASSERT(cur->oe_dlmlock == victim->oe_dlmlock);
526 ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_SHIFT;
527 chunk_start = cur->oe_start >> ppc_bits;
528 chunk_end = cur->oe_end >> ppc_bits;
529 if (chunk_start != (victim->oe_end >> ppc_bits) + 1 &&
530 chunk_end + 1 != victim->oe_start >> ppc_bits)
533 /* overall extent size should not exceed the max supported limit
534 * reported by the server */
535 if (cur->oe_end - cur->oe_start + 1 +
536 victim->oe_end - victim->oe_start + 1 > cli->cl_max_extent_pages)
539 OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
541 cur->oe_start = min(cur->oe_start, victim->oe_start);
542 cur->oe_end = max(cur->oe_end, victim->oe_end);
543 /* per-extent tax should be accounted only once for the whole extent */
544 cur->oe_grants += victim->oe_grants - cli->cl_grant_extent_tax;
545 cur->oe_nr_pages += victim->oe_nr_pages;
546 /* only the following bits are needed to merge */
547 cur->oe_urgent |= victim->oe_urgent;
548 cur->oe_memalloc |= victim->oe_memalloc;
549 list_splice_init(&victim->oe_pages, &cur->oe_pages);
550 list_del_init(&victim->oe_link);
551 victim->oe_nr_pages = 0;
553 osc_extent_get(victim);
554 __osc_extent_remove(victim);
555 osc_extent_put(env, victim);
557 OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
562 * Drop user count of osc_extent, and unplug IO asynchronously.
564 int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
566 struct osc_object *obj = ext->oe_obj;
567 struct client_obd *cli = osc_cli(obj);
571 LASSERT(atomic_read(&ext->oe_users) > 0);
572 LASSERT(sanity_check(ext) == 0);
573 LASSERT(ext->oe_grants > 0);
575 if (atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) {
576 LASSERT(ext->oe_state == OES_ACTIVE);
577 if (ext->oe_trunc_pending) {
578 /* a truncate process is waiting for this extent.
579 * This may happen due to a race, check
580 * osc_cache_truncate_start(). */
581 osc_extent_state_set(ext, OES_TRUNC);
582 ext->oe_trunc_pending = 0;
583 osc_object_unlock(obj);
587 osc_extent_state_set(ext, OES_CACHE);
588 osc_update_pending(obj, OBD_BRW_WRITE,
591 /* try to merge the previous and next extent. */
592 if (osc_extent_merge(env, ext, prev_extent(ext)) == 0)
593 grant += cli->cl_grant_extent_tax;
594 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
595 grant += cli->cl_grant_extent_tax;
598 list_move_tail(&ext->oe_link,
599 &obj->oo_urgent_exts);
600 else if (ext->oe_nr_pages == ext->oe_mppr) {
601 list_move_tail(&ext->oe_link,
604 osc_object_unlock(obj);
606 osc_unreserve_grant(cli, 0, grant);
609 osc_io_unplug_async(env, cli, obj);
611 osc_extent_put(env, ext);
616 overlapped(const struct osc_extent *ex1, const struct osc_extent *ex2)
618 return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
622 * Find or create an extent which includes @index, core function to manage
625 static struct osc_extent *osc_extent_find(const struct lu_env *env,
626 struct osc_object *obj, pgoff_t index,
627 unsigned int *grants)
629 struct client_obd *cli = osc_cli(obj);
630 struct osc_lock *olck;
631 struct cl_lock_descr *descr;
632 struct osc_extent *cur;
633 struct osc_extent *ext;
634 struct osc_extent *conflict = NULL;
635 struct osc_extent *found = NULL;
638 unsigned int max_pages; /* max_pages_per_rpc */
639 unsigned int chunksize;
640 int ppc_bits; /* pages per chunk bits */
645 cur = osc_extent_alloc(obj);
647 RETURN(ERR_PTR(-ENOMEM));
649 olck = osc_env_io(env)->oi_write_osclock;
650 LASSERTF(olck != NULL, "page %lu is not covered by lock\n", index);
651 LASSERT(olck->ols_state == OLS_GRANTED);
653 descr = &olck->ols_cl.cls_lock->cll_descr;
654 LASSERT(descr->cld_mode >= CLM_WRITE);
656 LASSERTF(cli->cl_chunkbits >= PAGE_SHIFT,
657 "chunkbits: %u\n", cli->cl_chunkbits);
658 ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
659 chunk_mask = ~((1 << ppc_bits) - 1);
660 chunksize = 1 << cli->cl_chunkbits;
661 chunk = index >> ppc_bits;
663 /* align end to RPC edge. */
664 max_pages = cli->cl_max_pages_per_rpc;
665 if ((max_pages & ~chunk_mask) != 0) {
666 CERROR("max_pages: %#x chunkbits: %u chunk_mask: %#lx\n",
667 max_pages, cli->cl_chunkbits, chunk_mask);
668 RETURN(ERR_PTR(-EINVAL));
670 max_end = index - (index % max_pages) + max_pages - 1;
671 max_end = min_t(pgoff_t, max_end, descr->cld_end);
673 /* initialize new extent by parameters so far */
674 cur->oe_max_end = max_end;
675 cur->oe_start = index & chunk_mask;
676 cur->oe_end = ((index + ~chunk_mask + 1) & chunk_mask) - 1;
677 if (cur->oe_start < descr->cld_start)
678 cur->oe_start = descr->cld_start;
679 if (cur->oe_end > max_end)
680 cur->oe_end = max_end;
682 cur->oe_mppr = max_pages;
683 if (olck->ols_dlmlock != NULL) {
684 LASSERT(olck->ols_hold);
685 cur->oe_dlmlock = LDLM_LOCK_GET(olck->ols_dlmlock);
686 lu_ref_add(&olck->ols_dlmlock->l_reference, "osc_extent", cur);
689 /* grants has been allocated by caller */
690 LASSERTF(*grants >= chunksize + cli->cl_grant_extent_tax,
691 "%u/%u/%u.\n", *grants, chunksize, cli->cl_grant_extent_tax);
692 LASSERTF((max_end - cur->oe_start) < max_pages, EXTSTR"\n",
696 osc_object_lock(obj);
697 ext = osc_extent_search(obj, cur->oe_start);
699 ext = first_extent(obj);
700 while (ext != NULL) {
701 pgoff_t ext_chk_start = ext->oe_start >> ppc_bits;
702 pgoff_t ext_chk_end = ext->oe_end >> ppc_bits;
704 LASSERT(sanity_check_nolock(ext) == 0);
705 if (chunk > ext_chk_end + 1 || chunk < ext_chk_start)
708 /* if covering by different locks, no chance to match */
709 if (olck->ols_dlmlock != ext->oe_dlmlock) {
710 EASSERTF(!overlapped(ext, cur), ext,
711 EXTSTR"\n", EXTPARA(cur));
713 ext = next_extent(ext);
717 /* discontiguous chunks? */
718 if (chunk + 1 < ext_chk_start) {
719 ext = next_extent(ext);
723 /* ok, from now on, ext and cur have these attrs:
724 * 1. covered by the same lock
725 * 2. contiguous at chunk level or overlapping. */
727 if (overlapped(ext, cur)) {
728 /* cur is the minimum unit, so overlapping means
730 EASSERTF((ext->oe_start <= cur->oe_start &&
731 ext->oe_end >= cur->oe_end),
732 ext, EXTSTR"\n", EXTPARA(cur));
734 if (ext->oe_state > OES_CACHE || ext->oe_fsync_wait) {
735 /* for simplicity, we wait for this extent to
736 * finish before going forward. */
737 conflict = osc_extent_get(ext);
741 found = osc_extent_hold(ext);
745 /* non-overlapped extent */
746 if (ext->oe_state != OES_CACHE || ext->oe_fsync_wait) {
747 /* we can't do anything for a non OES_CACHE extent, or
748 * if there is someone waiting for this extent to be
749 * flushed, try next one. */
750 ext = next_extent(ext);
754 /* check if they belong to the same rpc slot before trying to
755 * merge. the extents are not overlapped and contiguous at
756 * chunk level to get here. */
757 if (ext->oe_max_end != max_end) {
758 /* if they don't belong to the same RPC slot or
759 * max_pages_per_rpc has ever changed, do not merge. */
760 ext = next_extent(ext);
764 /* check whether maximum extent size will be hit */
765 if ((ext_chk_end - ext_chk_start + 1 + 1) << ppc_bits >
766 cli->cl_max_extent_pages) {
767 ext = next_extent(ext);
771 /* it's required that an extent must be contiguous at chunk
772 * level so that we know the whole extent is covered by grant
773 * (the pages in the extent are NOT required to be contiguous).
774 * Otherwise, it will be too much difficult to know which
775 * chunks have grants allocated. */
777 /* try to do front merge - extend ext's start */
778 if (chunk + 1 == ext_chk_start) {
779 /* ext must be chunk size aligned */
780 EASSERT((ext->oe_start & ~chunk_mask) == 0, ext);
782 /* pull ext's start back to cover cur */
783 ext->oe_start = cur->oe_start;
784 ext->oe_grants += chunksize;
785 LASSERT(*grants >= chunksize);
786 *grants -= chunksize;
788 found = osc_extent_hold(ext);
789 } else if (chunk == ext_chk_end + 1) {
791 ext->oe_end = cur->oe_end;
792 ext->oe_grants += chunksize;
793 LASSERT(*grants >= chunksize);
794 *grants -= chunksize;
796 /* try to merge with the next one because we just fill
798 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
799 /* we can save extent tax from next extent */
800 *grants += cli->cl_grant_extent_tax;
802 found = osc_extent_hold(ext);
807 ext = next_extent(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);
913 static int extent_wait_cb(struct osc_extent *ext, enum osc_extent_state state)
917 osc_object_lock(ext->oe_obj);
918 ret = ext->oe_state == state;
919 osc_object_unlock(ext->oe_obj);
925 * Wait for the extent's state to become @state.
927 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
928 enum osc_extent_state state)
930 struct osc_object *obj = ext->oe_obj;
934 osc_object_lock(obj);
935 LASSERT(sanity_check_nolock(ext) == 0);
936 /* `Kick' this extent only if the caller is waiting for it to be
938 if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp) {
939 if (ext->oe_state == OES_ACTIVE) {
941 } else if (ext->oe_state == OES_CACHE) {
943 osc_extent_hold(ext);
947 osc_object_unlock(obj);
949 osc_extent_release(env, ext);
951 /* wait for the extent until its state becomes @state */
952 rc = wait_event_idle_timeout(ext->oe_waitq, extent_wait_cb(ext, state),
953 cfs_time_seconds(600));
955 OSC_EXTENT_DUMP(D_ERROR, ext,
956 "%s: wait ext to %u timedout, recovery in progress?\n",
957 cli_name(osc_cli(obj)), state);
959 wait_event_idle(ext->oe_waitq, extent_wait_cb(ext, state));
969 * Discard pages with index greater than @size. If @ext is overlapped with
970 * @size, then partial truncate happens.
972 static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
977 struct osc_object *obj = ext->oe_obj;
978 struct client_obd *cli = osc_cli(obj);
979 struct osc_async_page *oap;
980 struct osc_async_page *tmp;
981 struct pagevec *pvec;
982 int pages_in_chunk = 0;
983 int ppc_bits = cli->cl_chunkbits -
985 __u64 trunc_chunk = trunc_index >> ppc_bits;
992 LASSERT(sanity_check(ext) == 0);
993 LASSERT(ext->oe_state == OES_TRUNC);
994 LASSERT(!ext->oe_urgent);
996 /* Request new lu_env.
997 * We can't use that env from osc_cache_truncate_start() because
998 * it's from lov_io_sub and not fully initialized. */
999 env = cl_env_get(&refcheck);
1001 RETURN(PTR_ERR(env));
1003 io = osc_env_thread_io(env);
1004 io->ci_obj = cl_object_top(osc2cl(obj));
1005 io->ci_ignore_layout = 1;
1006 pvec = &osc_env_info(env)->oti_pagevec;
1007 ll_pagevec_init(pvec, 0);
1008 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
1012 /* discard all pages with index greater than trunc_index */
1013 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
1015 pgoff_t index = osc_index(oap2osc(oap));
1016 struct cl_page *page = oap2cl_page(oap);
1018 LASSERT(list_empty(&oap->oap_rpc_item));
1020 /* only discard the pages with their index greater than
1021 * trunc_index, and ... */
1022 if (index < trunc_index ||
1023 (index == trunc_index && partial)) {
1024 /* accounting how many pages remaining in the chunk
1025 * so that we can calculate grants correctly. */
1026 if (index >> ppc_bits == trunc_chunk)
1031 list_del_init(&oap->oap_pending_item);
1034 lu_ref_add(&page->cp_reference, "truncate", current);
1036 if (cl_page_own(env, io, page) == 0) {
1037 cl_page_discard(env, io, page);
1038 cl_page_disown(env, io, page);
1040 LASSERT(page->cp_state == CPS_FREEING);
1044 lu_ref_del(&page->cp_reference, "truncate", current);
1045 cl_pagevec_put(env, page, pvec);
1050 pagevec_release(pvec);
1052 EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial,
1053 ext->oe_nr_pages == 0),
1054 ext, "trunc_index %lu, partial %d\n", trunc_index, partial);
1056 osc_object_lock(obj);
1057 if (ext->oe_nr_pages == 0) {
1058 LASSERT(pages_in_chunk == 0);
1059 grants = ext->oe_grants;
1061 } else { /* calculate how many grants we can free */
1062 int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
1066 /* if there is no pages in this chunk, we can also free grants
1067 * for the last chunk */
1068 if (pages_in_chunk == 0) {
1069 /* if this is the 1st chunk and no pages in this chunk,
1070 * ext->oe_nr_pages must be zero, so we should be in
1071 * the other if-clause. */
1072 LASSERT(trunc_chunk > 0);
1077 /* this is what we can free from this extent */
1078 grants = chunks << cli->cl_chunkbits;
1079 ext->oe_grants -= grants;
1080 last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
1081 ext->oe_end = min(last_index, ext->oe_max_end);
1082 LASSERT(ext->oe_end >= ext->oe_start);
1083 LASSERT(ext->oe_grants > 0);
1085 osc_object_unlock(obj);
1087 if (grants > 0 || nr_pages > 0)
1088 osc_free_grant(cli, nr_pages, grants, grants);
1091 cl_io_fini(env, io);
1092 cl_env_put(env, &refcheck);
1097 * This function is used to make the extent prepared for transfer.
1098 * A race with flusing page - ll_writepage() has to be handled cautiously.
1100 static int osc_extent_make_ready(const struct lu_env *env,
1101 struct osc_extent *ext)
1103 struct osc_async_page *oap;
1104 struct osc_async_page *last = NULL;
1105 struct osc_object *obj = ext->oe_obj;
1106 unsigned int page_count = 0;
1110 /* we're going to grab page lock, so object lock must not be taken. */
1111 LASSERT(sanity_check(ext) == 0);
1112 /* in locking state, any process should not touch this extent. */
1113 EASSERT(ext->oe_state == OES_LOCKING, ext);
1114 EASSERT(ext->oe_owner != NULL, ext);
1116 OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
1118 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1120 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
1123 /* checking ASYNC_READY is race safe */
1124 if ((oap->oap_async_flags & ASYNC_READY) != 0)
1127 rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
1130 spin_lock(&oap->oap_lock);
1131 oap->oap_async_flags |= ASYNC_READY;
1132 spin_unlock(&oap->oap_lock);
1135 LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
1138 LASSERTF(0, "unknown return code: %d\n", rc);
1142 LASSERT(page_count == ext->oe_nr_pages);
1143 LASSERT(last != NULL);
1144 /* the last page is the only one we need to refresh its count by
1145 * the size of file. */
1146 if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
1147 int last_oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
1148 LASSERT(last_oap_count > 0);
1149 LASSERT(last->oap_page_off + last_oap_count <= PAGE_SIZE);
1150 last->oap_count = last_oap_count;
1151 spin_lock(&last->oap_lock);
1152 last->oap_async_flags |= ASYNC_COUNT_STABLE;
1153 spin_unlock(&last->oap_lock);
1156 /* for the rest of pages, we don't need to call osf_refresh_count()
1157 * because it's known they are not the last page */
1158 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1159 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
1160 oap->oap_count = PAGE_SIZE - oap->oap_page_off;
1161 spin_lock(&oap->oap_lock);
1162 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1163 spin_unlock(&oap->oap_lock);
1167 osc_object_lock(obj);
1168 osc_extent_state_set(ext, OES_RPC);
1169 osc_object_unlock(obj);
1170 /* get a refcount for RPC. */
1171 osc_extent_get(ext);
1177 * Quick and simple version of osc_extent_find(). This function is frequently
1178 * called to expand the extent for the same IO. To expand the extent, the
1179 * page index must be in the same or next chunk of ext->oe_end.
1181 static int osc_extent_expand(struct osc_extent *ext, pgoff_t index,
1182 unsigned int *grants)
1184 struct osc_object *obj = ext->oe_obj;
1185 struct client_obd *cli = osc_cli(obj);
1186 struct osc_extent *next;
1187 int ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
1188 pgoff_t chunk = index >> ppc_bits;
1191 unsigned int chunksize = 1 << cli->cl_chunkbits;
1195 LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
1196 osc_object_lock(obj);
1197 LASSERT(sanity_check_nolock(ext) == 0);
1198 end_chunk = ext->oe_end >> ppc_bits;
1199 if (chunk > end_chunk + 1)
1200 GOTO(out, rc = -ERANGE);
1202 if (end_chunk >= chunk)
1205 LASSERT(end_chunk + 1 == chunk);
1207 /* try to expand this extent to cover @index */
1208 end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
1210 /* don't go over the maximum extent size reported by server */
1211 if (end_index - ext->oe_start + 1 > cli->cl_max_extent_pages)
1212 GOTO(out, rc = -ERANGE);
1214 next = next_extent(ext);
1215 if (next != NULL && next->oe_start <= end_index)
1216 /* complex mode - overlapped with the next extent,
1217 * this case will be handled by osc_extent_find() */
1218 GOTO(out, rc = -EAGAIN);
1220 ext->oe_end = end_index;
1221 ext->oe_grants += chunksize;
1222 LASSERT(*grants >= chunksize);
1223 *grants -= chunksize;
1224 EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
1225 "overlapped after expanding for %lu.\n", index);
1229 osc_object_unlock(obj);
1233 static void osc_extent_tree_dump0(int mask, struct osc_object *obj,
1234 const char *func, int line)
1236 struct osc_extent *ext;
1239 if (!cfs_cdebug_show(mask, DEBUG_SUBSYSTEM))
1242 CDEBUG(mask, "Dump object %p extents at %s:%d, mppr: %u.\n",
1243 obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
1245 /* osc_object_lock(obj); */
1247 for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
1248 OSC_EXTENT_DUMP(mask, ext, "in tree %d.\n", cnt++);
1251 list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
1252 OSC_EXTENT_DUMP(mask, ext, "hp %d.\n", cnt++);
1255 list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
1256 OSC_EXTENT_DUMP(mask, ext, "urgent %d.\n", cnt++);
1259 list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
1260 OSC_EXTENT_DUMP(mask, ext, "reading %d.\n", cnt++);
1261 /* osc_object_unlock(obj); */
1264 /* ------------------ osc extent end ------------------ */
1266 static inline int osc_is_ready(struct osc_object *osc)
1268 return !list_empty(&osc->oo_ready_item) ||
1269 !list_empty(&osc->oo_hp_ready_item);
1272 #define OSC_IO_DEBUG(OSC, STR, args...) \
1273 CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
1274 (OSC), osc_is_ready(OSC), \
1275 list_empty_marker(&(OSC)->oo_hp_ready_item), \
1276 list_empty_marker(&(OSC)->oo_ready_item), \
1277 atomic_read(&(OSC)->oo_nr_writes), \
1278 list_empty_marker(&(OSC)->oo_hp_exts), \
1279 list_empty_marker(&(OSC)->oo_urgent_exts), \
1280 atomic_read(&(OSC)->oo_nr_reads), \
1281 list_empty_marker(&(OSC)->oo_reading_exts), \
1284 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
1287 struct osc_page *opg = oap2osc_page(oap);
1288 struct cl_page *page = oap2cl_page(oap);
1291 LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
1294 result = cl_page_make_ready(env, page, CRT_WRITE);
1296 opg->ops_submit_time = ktime_get();
1300 static int osc_refresh_count(const struct lu_env *env,
1301 struct osc_async_page *oap, int cmd)
1303 struct osc_page *opg = oap2osc_page(oap);
1304 pgoff_t index = osc_index(oap2osc(oap));
1305 struct cl_object *obj;
1306 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1310 /* readpage queues with _COUNT_STABLE, shouldn't get here. */
1311 LASSERT(!(cmd & OBD_BRW_READ));
1312 LASSERT(opg != NULL);
1313 obj = opg->ops_cl.cpl_obj;
1315 cl_object_attr_lock(obj);
1316 result = cl_object_attr_get(env, obj, attr);
1317 cl_object_attr_unlock(obj);
1320 kms = attr->cat_kms;
1321 if (cl_offset(obj, index) >= kms)
1322 /* catch race with truncate */
1324 else if (cl_offset(obj, index + 1) > kms)
1325 /* catch sub-page write at end of file */
1326 return kms & ~PAGE_MASK;
1331 static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
1334 struct osc_page *opg = oap2osc_page(oap);
1335 struct cl_page *page = oap2cl_page(oap);
1336 enum cl_req_type crt;
1341 cmd &= ~OBD_BRW_NOQUOTA;
1342 LASSERTF(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ),
1343 "cp_state:%u, cmd:%d\n", page->cp_state, cmd);
1344 LASSERTF(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE),
1345 "cp_state:%u, cmd:%d\n", page->cp_state, cmd);
1346 LASSERT(opg->ops_transfer_pinned);
1348 crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
1349 /* Clear opg->ops_transfer_pinned before VM lock is released. */
1350 opg->ops_transfer_pinned = 0;
1352 opg->ops_submit_time = ktime_set(0, 0);
1353 srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
1356 if (rc == 0 && srvlock) {
1357 struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
1358 struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
1359 size_t bytes = oap->oap_count;
1361 if (crt == CRT_READ)
1362 stats->os_lockless_reads += bytes;
1364 stats->os_lockless_writes += bytes;
1368 * This has to be the last operation with the page, as locks are
1369 * released in cl_page_completion() and nothing except for the
1370 * reference counter protects page from concurrent reclaim.
1372 lu_ref_del(&page->cp_reference, "transfer", page);
1374 cl_page_completion(env, page, crt, rc);
1375 cl_page_put(env, page);
1380 #define OSC_DUMP_GRANT(mask, cli, fmt, args...) do { \
1381 struct client_obd *__tmp = (cli); \
1382 CDEBUG(mask, "%s: grant { dirty: %ld/%ld dirty_pages: %ld/%lu " \
1383 "dropped: %ld avail: %ld, dirty_grant: %ld, " \
1384 "reserved: %ld, flight: %d } lru {in list: %ld, " \
1385 "left: %ld, waiters: %d }" fmt "\n", \
1387 __tmp->cl_dirty_pages, __tmp->cl_dirty_max_pages, \
1388 atomic_long_read(&obd_dirty_pages), obd_max_dirty_pages, \
1389 __tmp->cl_lost_grant, __tmp->cl_avail_grant, \
1390 __tmp->cl_dirty_grant, \
1391 __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, \
1392 atomic_long_read(&__tmp->cl_lru_in_list), \
1393 atomic_long_read(&__tmp->cl_lru_busy), \
1394 atomic_read(&__tmp->cl_lru_shrinkers), ##args); \
1397 /* caller must hold loi_list_lock */
1398 static void osc_consume_write_grant(struct client_obd *cli,
1399 struct brw_page *pga)
1401 assert_spin_locked(&cli->cl_loi_list_lock);
1402 LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
1403 cli->cl_dirty_pages++;
1404 pga->flag |= OBD_BRW_FROM_GRANT;
1405 CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
1406 PAGE_SIZE, pga, pga->pg);
1407 osc_update_next_shrink(cli);
1410 /* the companion to osc_consume_write_grant, called when a brw has completed.
1411 * must be called with the loi lock held. */
1412 static void osc_release_write_grant(struct client_obd *cli,
1413 struct brw_page *pga)
1417 assert_spin_locked(&cli->cl_loi_list_lock);
1418 if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
1423 pga->flag &= ~OBD_BRW_FROM_GRANT;
1424 atomic_long_dec(&obd_dirty_pages);
1425 cli->cl_dirty_pages--;
1430 * To avoid sleeping with object lock held, it's good for us allocate enough
1431 * grants before entering into critical section.
1433 * client_obd_list_lock held by caller
1435 static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
1439 if (cli->cl_avail_grant >= bytes) {
1440 cli->cl_avail_grant -= bytes;
1441 cli->cl_reserved_grant += bytes;
1447 static void __osc_unreserve_grant(struct client_obd *cli,
1448 unsigned int reserved, unsigned int unused)
1450 /* it's quite normal for us to get more grant than reserved.
1451 * Thinking about a case that two extents merged by adding a new
1452 * chunk, we can save one extent tax. If extent tax is greater than
1453 * one chunk, we can save more grant by adding a new chunk */
1454 cli->cl_reserved_grant -= reserved;
1455 if (unused > reserved) {
1456 cli->cl_avail_grant += reserved;
1457 cli->cl_lost_grant += unused - reserved;
1458 cli->cl_dirty_grant -= unused - reserved;
1460 cli->cl_avail_grant += unused;
1461 cli->cl_dirty_grant += reserved - unused;
1465 static void osc_unreserve_grant_nolock(struct client_obd *cli,
1466 unsigned int reserved,
1467 unsigned int unused)
1469 __osc_unreserve_grant(cli, reserved, unused);
1471 osc_wake_cache_waiters(cli);
1474 static void osc_unreserve_grant(struct client_obd *cli,
1475 unsigned int reserved, unsigned int unused)
1477 spin_lock(&cli->cl_loi_list_lock);
1478 osc_unreserve_grant_nolock(cli, reserved, unused);
1479 spin_unlock(&cli->cl_loi_list_lock);
1483 * Free grant after IO is finished or canceled.
1485 * @lost_grant is used to remember how many grants we have allocated but not
1486 * used, we should return these grants to OST. There're two cases where grants
1489 * 2. blocksize at OST is less than PAGE_SIZE and a partial page was
1490 * written. In this case OST may use less chunks to serve this partial
1491 * write. OSTs don't actually know the page size on the client side. so
1492 * clients have to calculate lost grant by the blocksize on the OST.
1493 * See filter_grant_check() for details.
1495 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
1496 unsigned int lost_grant, unsigned int dirty_grant)
1498 unsigned long grant;
1500 grant = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
1502 spin_lock(&cli->cl_loi_list_lock);
1503 atomic_long_sub(nr_pages, &obd_dirty_pages);
1504 cli->cl_dirty_pages -= nr_pages;
1505 cli->cl_lost_grant += lost_grant;
1506 cli->cl_dirty_grant -= dirty_grant;
1507 if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) {
1508 /* borrow some grant from truncate to avoid the case that
1509 * truncate uses up all avail grant */
1510 cli->cl_lost_grant -= grant;
1511 cli->cl_avail_grant += grant;
1513 osc_wake_cache_waiters(cli);
1514 spin_unlock(&cli->cl_loi_list_lock);
1515 CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu/%lu\n",
1516 lost_grant, cli->cl_lost_grant,
1517 cli->cl_avail_grant, cli->cl_dirty_pages << PAGE_SHIFT,
1518 cli->cl_dirty_grant);
1522 * The companion to osc_enter_cache(), called when @oap is no longer part of
1523 * the dirty accounting due to error.
1525 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
1527 spin_lock(&cli->cl_loi_list_lock);
1528 osc_release_write_grant(cli, &oap->oap_brw_page);
1529 spin_unlock(&cli->cl_loi_list_lock);
1533 * Non-blocking version of osc_enter_cache() that consumes grant only when it
1536 static int osc_enter_cache_try(struct client_obd *cli,
1537 struct osc_async_page *oap,
1542 OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
1544 rc = osc_reserve_grant(cli, bytes);
1548 if (cli->cl_dirty_pages < cli->cl_dirty_max_pages) {
1549 if (atomic_long_add_return(1, &obd_dirty_pages) <=
1550 obd_max_dirty_pages) {
1551 osc_consume_write_grant(cli, &oap->oap_brw_page);
1555 atomic_long_dec(&obd_dirty_pages);
1557 __osc_unreserve_grant(cli, bytes, bytes);
1563 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
1566 spin_lock(&cli->cl_loi_list_lock);
1567 rc = list_empty(&ocw->ocw_entry);
1568 spin_unlock(&cli->cl_loi_list_lock);
1573 * The main entry to reserve dirty page accounting. Usually the grant reserved
1574 * in this function will be freed in bulk in osc_free_grant() unless it fails
1575 * to add osc cache, in that case, it will be freed in osc_exit_cache().
1577 * The process will be put into sleep if it's already run out of grant.
1579 static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
1580 struct osc_async_page *oap, int bytes)
1582 struct osc_object *osc = oap->oap_obj;
1583 struct lov_oinfo *loi = osc->oo_oinfo;
1584 struct osc_cache_waiter ocw;
1588 OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);
1590 spin_lock(&cli->cl_loi_list_lock);
1592 /* force the caller to try sync io. this can jump the list
1593 * of queued writes and create a discontiguous rpc stream */
1594 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
1595 cli->cl_dirty_max_pages == 0 ||
1596 cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync) {
1597 OSC_DUMP_GRANT(D_CACHE, cli, "forced sync i/o\n");
1598 GOTO(out, rc = -EDQUOT);
1601 /* Hopefully normal case - cache space and write credits available */
1602 if (list_empty(&cli->cl_cache_waiters) &&
1603 osc_enter_cache_try(cli, oap, bytes)) {
1604 OSC_DUMP_GRANT(D_CACHE, cli, "granted from cache\n");
1608 /* We can get here for two reasons: too many dirty pages in cache, or
1609 * run out of grants. In both cases we should write dirty pages out.
1610 * Adding a cache waiter will trigger urgent write-out no matter what
1612 * The exiting condition is no avail grants and no dirty pages caching,
1613 * that really means there is no space on the OST. */
1614 init_waitqueue_head(&ocw.ocw_waitq);
1616 ocw.ocw_grant = bytes;
1617 while (cli->cl_dirty_pages > 0 || cli->cl_w_in_flight > 0) {
1618 list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
1620 spin_unlock(&cli->cl_loi_list_lock);
1622 osc_io_unplug_async(env, cli, NULL);
1624 CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
1625 cli_name(cli), &ocw, oap);
1627 rc = wait_event_idle_timeout(ocw.ocw_waitq,
1628 ocw_granted(cli, &ocw),
1629 cfs_time_seconds(AT_OFF ?
1633 spin_lock(&cli->cl_loi_list_lock);
1636 /* l_wait_event is interrupted by signal or timed out */
1637 list_del_init(&ocw.ocw_entry);
1642 LASSERT(list_empty(&ocw.ocw_entry));
1647 if (osc_enter_cache_try(cli, oap, bytes)) {
1655 OSC_DUMP_GRANT(D_CACHE, cli, "finally got grant space\n");
1658 OSC_DUMP_GRANT(D_CACHE, cli,
1659 "timeout, fall back to sync i/o\n");
1660 osc_extent_tree_dump(D_CACHE, osc);
1661 /* fall back to synchronous I/O */
1665 /* Ensures restartability - LU-3581 */
1666 OSC_DUMP_GRANT(D_CACHE, cli, "interrupted\n");
1670 OSC_DUMP_GRANT(D_CACHE, cli,
1671 "no grant space, fall back to sync i/o\n");
1674 CDEBUG(D_CACHE, "%s: event for cache space @ %p never arrived "
1675 "due to %d, fall back to sync i/o\n",
1676 cli_name(cli), &ocw, rc);
1681 spin_unlock(&cli->cl_loi_list_lock);
1685 /* caller must hold loi_list_lock */
1686 void osc_wake_cache_waiters(struct client_obd *cli)
1688 struct list_head *l, *tmp;
1689 struct osc_cache_waiter *ocw;
1692 list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
1693 ocw = list_entry(l, struct osc_cache_waiter, ocw_entry);
1695 ocw->ocw_rc = -EDQUOT;
1697 if (osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant))
1700 if (ocw->ocw_rc == 0 ||
1701 !(cli->cl_dirty_pages > 0 || cli->cl_w_in_flight > 0)) {
1702 list_del_init(&ocw->ocw_entry);
1703 CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant "
1704 "%ld, %d\n", ocw, ocw->ocw_oap,
1705 cli->cl_avail_grant, ocw->ocw_rc);
1707 wake_up(&ocw->ocw_waitq);
1713 EXPORT_SYMBOL(osc_wake_cache_waiters);
1715 static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
1717 int hprpc = !!list_empty(&osc->oo_hp_exts);
1718 return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
1721 /* This maintains the lists of pending pages to read/write for a given object
1722 * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
1723 * to quickly find objects that are ready to send an RPC. */
1724 static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
1727 int invalid_import = 0;
1730 /* if we have an invalid import we want to drain the queued pages
1731 * by forcing them through rpcs that immediately fail and complete
1732 * the pages. recovery relies on this to empty the queued pages
1733 * before canceling the locks and evicting down the llite pages */
1734 if ((cli->cl_import == NULL || cli->cl_import->imp_invalid))
1737 if (cmd & OBD_BRW_WRITE) {
1738 if (atomic_read(&osc->oo_nr_writes) == 0)
1740 if (invalid_import) {
1741 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1744 if (!list_empty(&osc->oo_hp_exts)) {
1745 CDEBUG(D_CACHE, "high prio request forcing RPC\n");
1748 if (!list_empty(&osc->oo_urgent_exts)) {
1749 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1752 /* trigger a write rpc stream as long as there are dirtiers
1753 * waiting for space. as they're waiting, they're not going to
1754 * create more pages to coalesce with what's waiting.. */
1755 if (!list_empty(&cli->cl_cache_waiters)) {
1756 CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1759 if (!list_empty(&osc->oo_full_exts)) {
1760 CDEBUG(D_CACHE, "full extent ready, make an RPC\n");
1764 if (atomic_read(&osc->oo_nr_reads) == 0)
1766 if (invalid_import) {
1767 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1770 /* all read are urgent. */
1771 if (!list_empty(&osc->oo_reading_exts))
1778 static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
1780 struct client_obd *cli = osc_cli(obj);
1781 if (cmd & OBD_BRW_WRITE) {
1782 atomic_add(delta, &obj->oo_nr_writes);
1783 atomic_add(delta, &cli->cl_pending_w_pages);
1784 LASSERT(atomic_read(&obj->oo_nr_writes) >= 0);
1786 atomic_add(delta, &obj->oo_nr_reads);
1787 atomic_add(delta, &cli->cl_pending_r_pages);
1788 LASSERT(atomic_read(&obj->oo_nr_reads) >= 0);
1790 OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
1793 static int osc_makes_hprpc(struct osc_object *obj)
1795 return !list_empty(&obj->oo_hp_exts);
1798 static void on_list(struct list_head *item, struct list_head *list,
1801 if (list_empty(item) && should_be_on)
1802 list_add_tail(item, list);
1803 else if (!list_empty(item) && !should_be_on)
1804 list_del_init(item);
1807 /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
1808 * can find pages to build into rpcs quickly */
1809 static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1811 if (osc_makes_hprpc(osc)) {
1813 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
1814 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
1816 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
1817 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
1818 osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
1819 osc_makes_rpc(cli, osc, OBD_BRW_READ));
1822 on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
1823 atomic_read(&osc->oo_nr_writes) > 0);
1825 on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
1826 atomic_read(&osc->oo_nr_reads) > 0);
1828 return osc_is_ready(osc);
1831 static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1835 spin_lock(&cli->cl_loi_list_lock);
1836 is_ready = __osc_list_maint(cli, osc);
1837 spin_unlock(&cli->cl_loi_list_lock);
1842 /* this is trying to propogate async writeback errors back up to the
1843 * application. As an async write fails we record the error code for later if
1844 * the app does an fsync. As long as errors persist we force future rpcs to be
1845 * sync so that the app can get a sync error and break the cycle of queueing
1846 * pages for which writeback will fail. */
1847 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
1854 ar->ar_force_sync = 1;
1855 ar->ar_min_xid = ptlrpc_sample_next_xid();
1860 if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
1861 ar->ar_force_sync = 0;
1864 /* this must be called holding the loi list lock to give coverage to exit_cache,
1865 * async_flag maintenance, and oap_request */
1866 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
1867 struct osc_async_page *oap, int sent, int rc)
1869 struct osc_object *osc = oap->oap_obj;
1870 struct lov_oinfo *loi = osc->oo_oinfo;
1874 if (oap->oap_request != NULL) {
1875 xid = ptlrpc_req_xid(oap->oap_request);
1876 ptlrpc_req_finished(oap->oap_request);
1877 oap->oap_request = NULL;
1880 /* As the transfer for this page is being done, clear the flags */
1881 spin_lock(&oap->oap_lock);
1882 oap->oap_async_flags = 0;
1883 spin_unlock(&oap->oap_lock);
1884 oap->oap_interrupted = 0;
1886 if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
1887 spin_lock(&cli->cl_loi_list_lock);
1888 osc_process_ar(&cli->cl_ar, xid, rc);
1889 osc_process_ar(&loi->loi_ar, xid, rc);
1890 spin_unlock(&cli->cl_loi_list_lock);
1893 rc = osc_completion(env, oap, oap->oap_cmd, rc);
1895 CERROR("completion on oap %p obj %p returns %d.\n",
1901 struct extent_rpc_data {
1902 struct list_head *erd_rpc_list;
1903 unsigned int erd_page_count;
1904 unsigned int erd_max_pages;
1905 unsigned int erd_max_chunks;
1906 unsigned int erd_max_extents;
1909 static inline unsigned osc_extent_chunks(const struct osc_extent *ext)
1911 struct client_obd *cli = osc_cli(ext->oe_obj);
1912 unsigned ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
1914 return (ext->oe_end >> ppc_bits) - (ext->oe_start >> ppc_bits) + 1;
1918 can_merge(const struct osc_extent *ext, const struct osc_extent *in_rpc)
1920 if (ext->oe_no_merge || in_rpc->oe_no_merge)
1923 if (ext->oe_srvlock != in_rpc->oe_srvlock)
1926 if (ext->oe_ndelay != in_rpc->oe_ndelay)
1929 if (!ext->oe_grants != !in_rpc->oe_grants)
1932 if (ext->oe_dio != in_rpc->oe_dio)
1935 /* It's possible to have overlap on DIO */
1936 if (in_rpc->oe_dio && overlapped(ext, in_rpc))
1943 * Try to add extent to one RPC. We need to think about the following things:
1944 * - # of pages must not be over max_pages_per_rpc
1945 * - extent must be compatible with previous ones
1947 static int try_to_add_extent_for_io(struct client_obd *cli,
1948 struct osc_extent *ext,
1949 struct extent_rpc_data *data)
1951 struct osc_extent *tmp;
1952 unsigned int chunk_count;
1955 EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
1957 OSC_EXTENT_DUMP(D_CACHE, ext, "trying to add this extent\n");
1959 if (data->erd_max_extents == 0)
1962 chunk_count = osc_extent_chunks(ext);
1963 EASSERTF(data->erd_page_count != 0 ||
1964 chunk_count <= data->erd_max_chunks, ext,
1965 "The first extent to be fit in a RPC contains %u chunks, "
1966 "which is over the limit %u.\n", chunk_count,
1967 data->erd_max_chunks);
1968 if (chunk_count > data->erd_max_chunks)
1971 data->erd_max_pages = max(ext->oe_mppr, data->erd_max_pages);
1972 EASSERTF(data->erd_page_count != 0 ||
1973 ext->oe_nr_pages <= data->erd_max_pages, ext,
1974 "The first extent to be fit in a RPC contains %u pages, "
1975 "which is over the limit %u.\n", ext->oe_nr_pages,
1976 data->erd_max_pages);
1977 if (data->erd_page_count + ext->oe_nr_pages > data->erd_max_pages)
1980 list_for_each_entry(tmp, data->erd_rpc_list, oe_link) {
1981 EASSERT(tmp->oe_owner == current, tmp);
1983 if (!can_merge(ext, tmp))
1987 data->erd_max_extents--;
1988 data->erd_max_chunks -= chunk_count;
1989 data->erd_page_count += ext->oe_nr_pages;
1990 list_move_tail(&ext->oe_link, data->erd_rpc_list);
1991 ext->oe_owner = current;
1996 * In order to prevent multiple ptlrpcd from breaking contiguous extents,
1997 * get_write_extent() takes all appropriate extents in atomic.
1999 * The following policy is used to collect extents for IO:
2000 * 1. Add as many HP extents as possible;
2001 * 2. Add the first urgent extent in urgent extent list and take it out of
2003 * 3. Add subsequent extents of this urgent extent;
2004 * 4. If urgent list is not empty, goto 2;
2005 * 5. Traverse the extent tree from the 1st extent;
2006 * 6. Above steps exit if there is no space in this RPC.
2008 static unsigned int get_write_extents(struct osc_object *obj,
2009 struct list_head *rpclist)
2011 struct client_obd *cli = osc_cli(obj);
2012 struct osc_extent *ext;
2013 struct extent_rpc_data data = {
2014 .erd_rpc_list = rpclist,
2015 .erd_page_count = 0,
2016 .erd_max_pages = cli->cl_max_pages_per_rpc,
2017 .erd_max_chunks = osc_max_write_chunks(cli),
2018 .erd_max_extents = 256,
2021 LASSERT(osc_object_is_locked(obj));
2022 while (!list_empty(&obj->oo_hp_exts)) {
2023 ext = list_entry(obj->oo_hp_exts.next, struct osc_extent,
2025 LASSERT(ext->oe_state == OES_CACHE);
2026 if (!try_to_add_extent_for_io(cli, ext, &data))
2027 return data.erd_page_count;
2028 EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
2030 if (data.erd_page_count == data.erd_max_pages)
2031 return data.erd_page_count;
2033 while (!list_empty(&obj->oo_urgent_exts)) {
2034 ext = list_entry(obj->oo_urgent_exts.next,
2035 struct osc_extent, oe_link);
2036 if (!try_to_add_extent_for_io(cli, ext, &data))
2037 return data.erd_page_count;
2039 if (data.erd_page_count == data.erd_max_pages)
2040 return data.erd_page_count;
2042 /* One key difference between full extents and other extents: full
2043 * extents can usually only be added if the rpclist was empty, so if we
2044 * can't add one, we continue on to trying to add normal extents. This
2045 * is so we don't miss adding extra extents to an RPC containing high
2046 * priority or urgent extents. */
2047 while (!list_empty(&obj->oo_full_exts)) {
2048 ext = list_entry(obj->oo_full_exts.next,
2049 struct osc_extent, oe_link);
2050 if (!try_to_add_extent_for_io(cli, ext, &data))
2053 if (data.erd_page_count == data.erd_max_pages)
2054 return data.erd_page_count;
2056 ext = first_extent(obj);
2057 while (ext != NULL) {
2058 if ((ext->oe_state != OES_CACHE) ||
2059 /* this extent may be already in current rpclist */
2060 (!list_empty(&ext->oe_link) && ext->oe_owner != NULL)) {
2061 ext = next_extent(ext);
2065 if (!try_to_add_extent_for_io(cli, ext, &data))
2066 return data.erd_page_count;
2068 ext = next_extent(ext);
2070 return data.erd_page_count;
2074 osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
2075 struct osc_object *osc)
2079 struct osc_extent *ext;
2080 struct osc_extent *tmp;
2081 struct osc_extent *first = NULL;
2082 unsigned int page_count = 0;
2087 LASSERT(osc_object_is_locked(osc));
2089 page_count = get_write_extents(osc, &rpclist);
2090 LASSERT(equi(page_count == 0, list_empty(&rpclist)));
2092 if (list_empty(&rpclist))
2095 osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
2097 list_for_each_entry(ext, &rpclist, oe_link) {
2098 LASSERT(ext->oe_state == OES_CACHE ||
2099 ext->oe_state == OES_LOCK_DONE);
2100 if (ext->oe_state == OES_CACHE)
2101 osc_extent_state_set(ext, OES_LOCKING);
2103 osc_extent_state_set(ext, OES_RPC);
2106 /* we're going to grab page lock, so release object lock because
2107 * lock order is page lock -> object lock. */
2108 osc_object_unlock(osc);
2110 list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
2111 if (ext->oe_state == OES_LOCKING) {
2112 rc = osc_extent_make_ready(env, ext);
2113 if (unlikely(rc < 0)) {
2114 list_del_init(&ext->oe_link);
2115 osc_extent_finish(env, ext, 0, rc);
2119 if (first == NULL) {
2121 srvlock = ext->oe_srvlock;
2123 LASSERT(srvlock == ext->oe_srvlock);
2127 if (!list_empty(&rpclist)) {
2128 LASSERT(page_count > 0);
2129 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE);
2130 LASSERT(list_empty(&rpclist));
2133 osc_object_lock(osc);
2138 * prepare pages for ASYNC io and put pages in send queue.
2140 * \param cmd OBD_BRW_* macroses
2141 * \param lop pending pages
2143 * \return zero if no page added to send queue.
2144 * \return 1 if pages successfully added to send queue.
2145 * \return negative on errors.
2148 osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
2149 struct osc_object *osc)
2152 struct osc_extent *ext;
2153 struct osc_extent *next;
2155 struct extent_rpc_data data = {
2156 .erd_rpc_list = &rpclist,
2157 .erd_page_count = 0,
2158 .erd_max_pages = cli->cl_max_pages_per_rpc,
2159 .erd_max_chunks = UINT_MAX,
2160 .erd_max_extents = UINT_MAX,
2165 LASSERT(osc_object_is_locked(osc));
2166 list_for_each_entry_safe(ext, next, &osc->oo_reading_exts, oe_link) {
2167 EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
2168 if (!try_to_add_extent_for_io(cli, ext, &data))
2170 osc_extent_state_set(ext, OES_RPC);
2171 EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
2173 LASSERT(data.erd_page_count <= data.erd_max_pages);
2175 osc_update_pending(osc, OBD_BRW_READ, -data.erd_page_count);
2177 if (!list_empty(&rpclist)) {
2178 osc_object_unlock(osc);
2180 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ);
2181 LASSERT(list_empty(&rpclist));
2183 osc_object_lock(osc);
2188 #define list_to_obj(list, item) ({ \
2189 struct list_head *__tmp = (list)->next; \
2190 list_del_init(__tmp); \
2191 list_entry(__tmp, struct osc_object, oo_##item); \
2194 /* This is called by osc_check_rpcs() to find which objects have pages that
2195 * we could be sending. These lists are maintained by osc_makes_rpc(). */
2196 static struct osc_object *osc_next_obj(struct client_obd *cli)
2200 /* First return objects that have blocked locks so that they
2201 * will be flushed quickly and other clients can get the lock,
2202 * then objects which have pages ready to be stuffed into RPCs */
2203 if (!list_empty(&cli->cl_loi_hp_ready_list))
2204 RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
2205 if (!list_empty(&cli->cl_loi_ready_list))
2206 RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
2208 /* then if we have cache waiters, return all objects with queued
2209 * writes. This is especially important when many small files
2210 * have filled up the cache and not been fired into rpcs because
2211 * they don't pass the nr_pending/object threshhold */
2212 if (!list_empty(&cli->cl_cache_waiters) &&
2213 !list_empty(&cli->cl_loi_write_list))
2214 RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
2216 /* then return all queued objects when we have an invalid import
2217 * so that they get flushed */
2218 if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2219 if (!list_empty(&cli->cl_loi_write_list))
2220 RETURN(list_to_obj(&cli->cl_loi_write_list,
2222 if (!list_empty(&cli->cl_loi_read_list))
2223 RETURN(list_to_obj(&cli->cl_loi_read_list,
2229 /* called with the loi list lock held */
2230 static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2231 __must_hold(&cli->cl_loi_list_lock)
2233 struct osc_object *osc;
2237 while ((osc = osc_next_obj(cli)) != NULL) {
2238 struct cl_object *obj = osc2cl(osc);
2239 struct lu_ref_link link;
2241 OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
2243 if (osc_max_rpc_in_flight(cli, osc)) {
2244 __osc_list_maint(cli, osc);
2249 spin_unlock(&cli->cl_loi_list_lock);
2250 lu_object_ref_add_at(&obj->co_lu, &link, "check", current);
2252 /* attempt some read/write balancing by alternating between
2253 * reads and writes in an object. The makes_rpc checks here
2254 * would be redundant if we were getting read/write work items
2255 * instead of objects. we don't want send_oap_rpc to drain a
2256 * partial read pending queue when we're given this object to
2257 * do io on writes while there are cache waiters */
2258 osc_object_lock(osc);
2259 if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
2260 rc = osc_send_write_rpc(env, cli, osc);
2262 CERROR("Write request failed with %d\n", rc);
2264 /* osc_send_write_rpc failed, mostly because of
2267 * It can't break here, because if:
2268 * - a page was submitted by osc_io_submit, so
2270 * - no request in flight
2271 * - no subsequent request
2272 * The system will be in live-lock state,
2273 * because there is no chance to call
2274 * osc_io_unplug() and osc_check_rpcs() any
2275 * more. pdflush can't help in this case,
2276 * because it might be blocked at grabbing
2277 * the page lock as we mentioned.
2279 * Anyway, continue to drain pages. */
2283 if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
2284 rc = osc_send_read_rpc(env, cli, osc);
2286 CERROR("Read request failed with %d\n", rc);
2288 osc_object_unlock(osc);
2290 osc_list_maint(cli, osc);
2291 lu_object_ref_del_at(&obj->co_lu, &link, "check", current);
2292 cl_object_put(env, obj);
2294 spin_lock(&cli->cl_loi_list_lock);
2298 int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
2299 struct osc_object *osc, int async)
2303 if (osc != NULL && osc_list_maint(cli, osc) == 0)
2307 spin_lock(&cli->cl_loi_list_lock);
2308 osc_check_rpcs(env, cli);
2309 spin_unlock(&cli->cl_loi_list_lock);
2311 CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli);
2312 LASSERT(cli->cl_writeback_work != NULL);
2313 rc = ptlrpcd_queue_work(cli->cl_writeback_work);
2317 EXPORT_SYMBOL(osc_io_unplug0);
2319 int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
2320 struct page *page, loff_t offset)
2322 struct obd_export *exp = osc_export(osc);
2323 struct osc_async_page *oap = &ops->ops_oap;
2327 return cfs_size_round(sizeof(*oap));
2329 oap->oap_magic = OAP_MAGIC;
2330 oap->oap_cli = &exp->exp_obd->u.cli;
2333 oap->oap_page = page;
2334 oap->oap_obj_off = offset;
2335 LASSERT(!(offset & ~PAGE_MASK));
2337 INIT_LIST_HEAD(&oap->oap_pending_item);
2338 INIT_LIST_HEAD(&oap->oap_rpc_item);
2340 spin_lock_init(&oap->oap_lock);
2341 CDEBUG(D_INFO, "oap %p page %p obj off %llu\n",
2342 oap, page, oap->oap_obj_off);
2345 EXPORT_SYMBOL(osc_prep_async_page);
2347 int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
2348 struct osc_page *ops, cl_commit_cbt cb)
2350 struct osc_io *oio = osc_env_io(env);
2351 struct osc_extent *ext = NULL;
2352 struct osc_async_page *oap = &ops->ops_oap;
2353 struct client_obd *cli = oap->oap_cli;
2354 struct osc_object *osc = oap->oap_obj;
2355 struct pagevec *pvec = &osc_env_info(env)->oti_pagevec;
2358 unsigned int grants = 0;
2359 u32 brw_flags = OBD_BRW_ASYNC;
2360 int cmd = OBD_BRW_WRITE;
2361 int need_release = 0;
2365 if (oap->oap_magic != OAP_MAGIC)
2368 if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2371 if (!list_empty(&oap->oap_pending_item) ||
2372 !list_empty(&oap->oap_rpc_item))
2375 /* Set the OBD_BRW_SRVLOCK before the page is queued. */
2376 brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
2377 if (oio->oi_cap_sys_resource || io->ci_noquota) {
2378 brw_flags |= OBD_BRW_NOQUOTA;
2379 cmd |= OBD_BRW_NOQUOTA;
2382 /* check if the file's owner/group is over quota */
2383 if (!(cmd & OBD_BRW_NOQUOTA)) {
2384 struct cl_object *obj;
2385 struct cl_attr *attr;
2386 unsigned int qid[LL_MAXQUOTAS];
2388 obj = cl_object_top(&osc->oo_cl);
2389 attr = &osc_env_info(env)->oti_attr;
2391 cl_object_attr_lock(obj);
2392 rc = cl_object_attr_get(env, obj, attr);
2393 cl_object_attr_unlock(obj);
2395 qid[USRQUOTA] = attr->cat_uid;
2396 qid[GRPQUOTA] = attr->cat_gid;
2397 qid[PRJQUOTA] = attr->cat_projid;
2398 if (rc == 0 && osc_quota_chkdq(cli, qid) == -EDQUOT)
2405 oap->oap_page_off = ops->ops_from;
2406 oap->oap_count = ops->ops_to - ops->ops_from;
2407 /* No need to hold a lock here,
2408 * since this page is not in any list yet. */
2409 oap->oap_async_flags = 0;
2410 oap->oap_brw_flags = brw_flags;
2412 OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
2413 oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
2415 index = osc_index(oap2osc(oap));
2417 /* Add this page into extent by the following steps:
2418 * 1. if there exists an active extent for this IO, mostly this page
2419 * can be added to the active extent and sometimes we need to
2420 * expand extent to accomodate this page;
2421 * 2. otherwise, a new extent will be allocated. */
2423 ext = oio->oi_active;
2424 if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) {
2425 /* one chunk plus extent overhead must be enough to write this
2427 grants = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
2428 if (ext->oe_end >= index)
2431 /* it doesn't need any grant to dirty this page */
2432 spin_lock(&cli->cl_loi_list_lock);
2433 rc = osc_enter_cache_try(cli, oap, grants);
2434 if (rc == 0) { /* try failed */
2437 } else if (ext->oe_end < index) {
2439 /* try to expand this extent */
2440 rc = osc_extent_expand(ext, index, &tmp);
2443 /* don't free reserved grant */
2445 OSC_EXTENT_DUMP(D_CACHE, ext,
2446 "expanded for %lu.\n", index);
2447 osc_unreserve_grant_nolock(cli, grants, tmp);
2451 spin_unlock(&cli->cl_loi_list_lock);
2453 } else if (ext != NULL) {
2454 /* index is located outside of active extent */
2458 osc_extent_release(env, ext);
2459 oio->oi_active = NULL;
2464 tmp = (1 << cli->cl_chunkbits) + cli->cl_grant_extent_tax;
2466 /* try to find new extent to cover this page */
2467 LASSERT(oio->oi_active == NULL);
2468 /* we may have allocated grant for this page if we failed
2469 * to expand the previous active extent. */
2470 LASSERT(ergo(grants > 0, grants >= tmp));
2474 /* We haven't allocated grant for this page, and we
2475 * must not hold a page lock while we do enter_cache,
2476 * so we must mark dirty & unlock any pages in the
2477 * write commit pagevec. */
2478 if (pagevec_count(pvec)) {
2480 pagevec_reinit(pvec);
2482 rc = osc_enter_cache(env, cli, oap, tmp);
2489 ext = osc_extent_find(env, osc, index, &tmp);
2491 LASSERT(tmp == grants);
2492 osc_exit_cache(cli, oap);
2496 oio->oi_active = ext;
2500 osc_unreserve_grant(cli, grants, tmp);
2503 LASSERT(ergo(rc == 0, ext != NULL));
2505 EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
2506 ext, "index = %lu.\n", index);
2507 LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
2509 osc_object_lock(osc);
2510 if (ext->oe_nr_pages == 0)
2511 ext->oe_srvlock = ops->ops_srvlock;
2513 LASSERT(ext->oe_srvlock == ops->ops_srvlock);
2515 list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
2516 osc_object_unlock(osc);
2518 if (!ext->oe_layout_version)
2519 ext->oe_layout_version = io->ci_layout_version;
2525 int osc_teardown_async_page(const struct lu_env *env,
2526 struct osc_object *obj, struct osc_page *ops)
2528 struct osc_async_page *oap = &ops->ops_oap;
2532 LASSERT(oap->oap_magic == OAP_MAGIC);
2534 CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
2535 oap, ops, osc_index(oap2osc(oap)));
2537 if (!list_empty(&oap->oap_rpc_item)) {
2538 CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
2540 } else if (!list_empty(&oap->oap_pending_item)) {
2541 struct osc_extent *ext = NULL;
2543 osc_object_lock(obj);
2544 ext = osc_extent_lookup(obj, osc_index(oap2osc(oap)));
2545 osc_object_unlock(obj);
2546 /* only truncated pages are allowed to be taken out.
2547 * See osc_extent_truncate() and osc_cache_truncate_start()
2549 if (ext != NULL && ext->oe_state != OES_TRUNC) {
2550 OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
2551 osc_index(oap2osc(oap)));
2555 osc_extent_put(env, ext);
2561 * This is called when a page is picked up by kernel to write out.
2563 * We should find out the corresponding extent and add the whole extent
2564 * into urgent list. The extent may be being truncated or used, handle it
2567 int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
2568 struct osc_page *ops)
2570 struct osc_extent *ext = NULL;
2571 struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
2572 struct cl_page *cp = ops->ops_cl.cpl_page;
2573 pgoff_t index = osc_index(ops);
2574 struct osc_async_page *oap = &ops->ops_oap;
2575 bool unplug = false;
2579 osc_object_lock(obj);
2580 ext = osc_extent_lookup(obj, index);
2582 osc_extent_tree_dump(D_ERROR, obj);
2583 LASSERTF(0, "page index %lu is NOT covered.\n", index);
2586 switch (ext->oe_state) {
2589 CL_PAGE_DEBUG(D_ERROR, env, cp, "flush an in-rpc page?\n");
2593 /* If we know this extent is being written out, we should abort
2594 * so that the writer can make this page ready. Otherwise, there
2595 * exists a deadlock problem because other process can wait for
2596 * page writeback bit holding page lock; and meanwhile in
2597 * vvp_page_make_ready(), we need to grab page lock before
2598 * really sending the RPC. */
2600 /* race with truncate, page will be redirtied */
2602 /* The extent is active so we need to abort and let the caller
2603 * re-dirty the page. If we continued on here, and we were the
2604 * one making the extent active, we could deadlock waiting for
2605 * the page writeback to clear but it won't because the extent
2606 * is active and won't be written out. */
2607 GOTO(out, rc = -EAGAIN);
2612 rc = cl_page_prep(env, io, cp, CRT_WRITE);
2616 spin_lock(&oap->oap_lock);
2617 oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
2618 spin_unlock(&oap->oap_lock);
2620 if (memory_pressure_get())
2621 ext->oe_memalloc = 1;
2624 if (ext->oe_state == OES_CACHE) {
2625 OSC_EXTENT_DUMP(D_CACHE, ext,
2626 "flush page %p make it urgent.\n", oap);
2627 if (list_empty(&ext->oe_link))
2628 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2635 osc_object_unlock(obj);
2636 osc_extent_put(env, ext);
2638 osc_io_unplug_async(env, osc_cli(obj), obj);
2643 * this is called when a sync waiter receives an interruption. Its job is to
2644 * get the caller woken as soon as possible. If its page hasn't been put in an
2645 * rpc yet it can dequeue immediately. Otherwise it has to mark the rpc as
2646 * desiring interruption which will forcefully complete the rpc once the rpc
2649 int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops)
2651 struct osc_async_page *oap = &ops->ops_oap;
2652 struct osc_object *obj = oap->oap_obj;
2653 struct client_obd *cli = osc_cli(obj);
2654 struct osc_extent *ext;
2655 struct osc_extent *found = NULL;
2656 struct list_head *plist;
2657 pgoff_t index = osc_index(ops);
2662 LASSERT(!oap->oap_interrupted);
2663 oap->oap_interrupted = 1;
2665 /* Find out the caching extent */
2666 osc_object_lock(obj);
2667 if (oap->oap_cmd & OBD_BRW_WRITE) {
2668 plist = &obj->oo_urgent_exts;
2669 cmd = OBD_BRW_WRITE;
2671 plist = &obj->oo_reading_exts;
2674 list_for_each_entry(ext, plist, oe_link) {
2675 if (ext->oe_start <= index && ext->oe_end >= index) {
2676 LASSERT(ext->oe_state == OES_LOCK_DONE);
2677 /* For OES_LOCK_DONE state extent, it has already held
2678 * a refcount for RPC. */
2679 found = osc_extent_get(ext);
2683 if (found != NULL) {
2684 list_del_init(&found->oe_link);
2685 osc_update_pending(obj, cmd, -found->oe_nr_pages);
2686 osc_object_unlock(obj);
2688 osc_extent_finish(env, found, 0, -EINTR);
2689 osc_extent_put(env, found);
2692 osc_object_unlock(obj);
2693 /* ok, it's been put in an rpc. only one oap gets a request
2695 if (oap->oap_request != NULL) {
2696 ptlrpc_mark_interrupted(oap->oap_request);
2697 ptlrpcd_wake(oap->oap_request);
2698 ptlrpc_req_finished(oap->oap_request);
2699 oap->oap_request = NULL;
2703 osc_list_maint(cli, obj);
2707 int osc_queue_sync_pages(const struct lu_env *env, const struct cl_io *io,
2708 struct osc_object *obj, struct list_head *list,
2711 struct client_obd *cli = osc_cli(obj);
2712 struct osc_extent *ext;
2713 struct osc_async_page *oap;
2715 int mppr = cli->cl_max_pages_per_rpc;
2716 bool can_merge = true;
2717 pgoff_t start = CL_PAGE_EOF;
2721 list_for_each_entry(oap, list, oap_pending_item) {
2722 struct osc_page *opg = oap2osc_page(oap);
2723 pgoff_t index = osc_index(opg);
2730 mppr <<= (page_count > mppr);
2732 if (unlikely(opg->ops_from > 0 || opg->ops_to < PAGE_SIZE))
2736 ext = osc_extent_alloc(obj);
2738 struct osc_async_page *tmp;
2740 list_for_each_entry_safe(oap, tmp, list, oap_pending_item) {
2741 list_del_init(&oap->oap_pending_item);
2742 osc_ap_completion(env, cli, oap, 0, -ENOMEM);
2747 ext->oe_rw = !!(brw_flags & OBD_BRW_READ);
2749 ext->oe_no_merge = !can_merge;
2751 ext->oe_start = start;
2752 ext->oe_end = ext->oe_max_end = end;
2754 ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
2755 ext->oe_ndelay = !!(brw_flags & OBD_BRW_NDELAY);
2756 ext->oe_dio = !!(brw_flags & OBD_BRW_NOCACHE);
2757 ext->oe_nr_pages = page_count;
2758 ext->oe_mppr = mppr;
2759 list_splice_init(list, &ext->oe_pages);
2760 ext->oe_layout_version = io->ci_layout_version;
2762 osc_object_lock(obj);
2763 /* Reuse the initial refcount for RPC, don't drop it */
2764 osc_extent_state_set(ext, OES_LOCK_DONE);
2765 if (!ext->oe_rw) { /* write */
2766 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2767 osc_update_pending(obj, OBD_BRW_WRITE, page_count);
2769 list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
2770 osc_update_pending(obj, OBD_BRW_READ, page_count);
2772 osc_object_unlock(obj);
2774 osc_io_unplug_async(env, cli, obj);
2779 * Called by osc_io_setattr_start() to freeze and destroy covering extents.
2781 int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
2782 __u64 size, struct osc_extent **extp)
2784 struct client_obd *cli = osc_cli(obj);
2785 struct osc_extent *ext;
2786 struct osc_extent *waiting = NULL;
2793 /* pages with index greater or equal to index will be truncated. */
2794 index = cl_index(osc2cl(obj), size);
2795 partial = size > cl_offset(osc2cl(obj), index);
2798 osc_object_lock(obj);
2799 ext = osc_extent_search(obj, index);
2801 ext = first_extent(obj);
2802 else if (ext->oe_end < index)
2803 ext = next_extent(ext);
2804 while (ext != NULL) {
2805 EASSERT(ext->oe_state != OES_TRUNC, ext);
2807 if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
2808 /* if ext is in urgent state, it means there must exist
2809 * a page already having been flushed by write_page().
2810 * We have to wait for this extent because we can't
2811 * truncate that page. */
2812 OSC_EXTENT_DUMP(D_CACHE, ext,
2813 "waiting for busy extent\n");
2814 waiting = osc_extent_get(ext);
2818 OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:%llu.\n", size);
2820 osc_extent_get(ext);
2821 if (ext->oe_state == OES_ACTIVE) {
2822 /* though we grab inode mutex for write path, but we
2823 * release it before releasing extent(in osc_io_end()),
2824 * so there is a race window that an extent is still
2825 * in OES_ACTIVE when truncate starts. */
2826 LASSERT(!ext->oe_trunc_pending);
2827 ext->oe_trunc_pending = 1;
2829 EASSERT(ext->oe_state == OES_CACHE, ext);
2830 osc_extent_state_set(ext, OES_TRUNC);
2831 osc_update_pending(obj, OBD_BRW_WRITE,
2834 /* This extent could be on the full extents list, that's OK */
2835 EASSERT(!ext->oe_hp && !ext->oe_urgent, ext);
2836 if (!list_empty(&ext->oe_link))
2837 list_move_tail(&ext->oe_link, &list);
2839 list_add_tail(&ext->oe_link, &list);
2841 ext = next_extent(ext);
2843 osc_object_unlock(obj);
2845 osc_list_maint(cli, obj);
2847 while (!list_empty(&list)) {
2850 ext = list_entry(list.next, struct osc_extent, oe_link);
2851 list_del_init(&ext->oe_link);
2853 /* extent may be in OES_ACTIVE state because inode mutex
2854 * is released before osc_io_end() in file write case */
2855 if (ext->oe_state != OES_TRUNC)
2856 osc_extent_wait(env, ext, OES_TRUNC);
2858 rc = osc_extent_truncate(ext, index, partial);
2863 OSC_EXTENT_DUMP(D_ERROR, ext,
2864 "truncate error %d\n", rc);
2865 } else if (ext->oe_nr_pages == 0) {
2866 osc_extent_remove(ext);
2868 /* this must be an overlapped extent which means only
2869 * part of pages in this extent have been truncated.
2871 EASSERTF(ext->oe_start <= index, ext,
2872 "trunc index = %lu/%d.\n", index, partial);
2873 /* fix index to skip this partially truncated extent */
2874 index = ext->oe_end + 1;
2877 /* we need to hold this extent in OES_TRUNC state so
2878 * that no writeback will happen. This is to avoid
2880 * Only partial truncate can reach here, if @size is
2881 * not zero, the caller should provide a valid @extp. */
2882 LASSERT(*extp == NULL);
2883 *extp = osc_extent_get(ext);
2884 OSC_EXTENT_DUMP(D_CACHE, ext,
2885 "trunc at %llu\n", size);
2887 osc_extent_put(env, ext);
2889 if (waiting != NULL) {
2892 /* ignore the result of osc_extent_wait the write initiator
2893 * should take care of it. */
2894 rc = osc_extent_wait(env, waiting, OES_INV);
2896 OSC_EXTENT_DUMP(D_CACHE, waiting, "error: %d.\n", rc);
2898 osc_extent_put(env, waiting);
2904 EXPORT_SYMBOL(osc_cache_truncate_start);
2907 * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
2909 void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext)
2912 struct osc_object *obj = ext->oe_obj;
2913 bool unplug = false;
2915 EASSERT(ext->oe_nr_pages > 0, ext);
2916 EASSERT(ext->oe_state == OES_TRUNC, ext);
2917 EASSERT(!ext->oe_urgent, ext);
2919 OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
2920 osc_object_lock(obj);
2921 osc_extent_state_set(ext, OES_CACHE);
2922 if (ext->oe_fsync_wait && !ext->oe_urgent) {
2924 list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
2927 osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
2928 osc_object_unlock(obj);
2929 osc_extent_put(env, ext);
2932 osc_io_unplug_async(env, osc_cli(obj), obj);
2937 * Wait for extents in a specific range to be written out.
2938 * The caller must have called osc_cache_writeback_range() to issue IO
2939 * otherwise it will take a long time for this function to finish.
2941 * Caller must hold inode_mutex , or cancel exclusive dlm lock so that
2942 * nobody else can dirty this range of file while we're waiting for
2943 * extents to be written.
2945 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
2946 pgoff_t start, pgoff_t end)
2948 struct osc_extent *ext;
2949 pgoff_t index = start;
2954 osc_object_lock(obj);
2955 ext = osc_extent_search(obj, index);
2957 ext = first_extent(obj);
2958 else if (ext->oe_end < index)
2959 ext = next_extent(ext);
2960 while (ext != NULL) {
2963 if (ext->oe_start > end)
2966 if (!ext->oe_fsync_wait) {
2967 ext = next_extent(ext);
2971 EASSERT(ergo(ext->oe_state == OES_CACHE,
2972 ext->oe_hp || ext->oe_urgent), ext);
2973 EASSERT(ergo(ext->oe_state == OES_ACTIVE,
2974 !ext->oe_hp && ext->oe_urgent), ext);
2976 index = ext->oe_end + 1;
2977 osc_extent_get(ext);
2978 osc_object_unlock(obj);
2980 rc = osc_extent_wait(env, ext, OES_INV);
2983 osc_extent_put(env, ext);
2986 osc_object_unlock(obj);
2988 OSC_IO_DEBUG(obj, "sync file range.\n");
2991 EXPORT_SYMBOL(osc_cache_wait_range);
2994 * Called to write out a range of osc object.
2996 * @hp : should be set this is caused by lock cancel;
2997 * @discard: is set if dirty pages should be dropped - file will be deleted or
2998 * truncated, this implies there is no partially discarding extents.
3000 * Return how many pages will be issued, or error code if error occurred.
3002 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
3003 pgoff_t start, pgoff_t end, int hp, int discard)
3005 struct osc_extent *ext;
3006 LIST_HEAD(discard_list);
3007 bool unplug = false;
3011 osc_object_lock(obj);
3012 ext = osc_extent_search(obj, start);
3014 ext = first_extent(obj);
3015 else if (ext->oe_end < start)
3016 ext = next_extent(ext);
3017 while (ext != NULL) {
3018 if (ext->oe_start > end)
3021 ext->oe_fsync_wait = 1;
3022 switch (ext->oe_state) {
3024 result += ext->oe_nr_pages;
3026 struct list_head *list = NULL;
3028 EASSERT(!ext->oe_hp, ext);
3030 list = &obj->oo_hp_exts;
3031 } else if (!ext->oe_urgent) {
3033 list = &obj->oo_urgent_exts;
3036 list_move_tail(&ext->oe_link, list);
3039 struct client_obd *cli = osc_cli(obj);
3040 int pcc_bits = cli->cl_chunkbits - PAGE_SHIFT;
3041 pgoff_t align_by = (1 << pcc_bits);
3042 pgoff_t a_start = round_down(start, align_by);
3043 pgoff_t a_end = round_up(end, align_by);
3047 a_end = CL_PAGE_EOF;
3048 /* the only discarder is lock cancelling, so
3049 * [start, end], aligned by chunk size, must
3050 * contain this extent */
3051 LASSERTF(ext->oe_start >= a_start &&
3052 ext->oe_end <= a_end,
3053 "ext [%lu, %lu] reg [%lu, %lu] "
3054 "orig [%lu %lu] align %lu bits "
3055 "%d\n", ext->oe_start, ext->oe_end,
3056 a_start, a_end, start, end,
3057 align_by, pcc_bits);
3058 osc_extent_state_set(ext, OES_LOCKING);
3059 ext->oe_owner = current;
3060 list_move_tail(&ext->oe_link,
3062 osc_update_pending(obj, OBD_BRW_WRITE,
3067 /* It's pretty bad to wait for ACTIVE extents, because
3068 * we don't know how long we will wait for it to be
3069 * flushed since it may be blocked at awaiting more
3070 * grants. We do this for the correctness of fsync. */
3071 LASSERT(hp == 0 && discard == 0);
3075 /* this extent is being truncated, can't do anything
3076 * for it now. it will be set to urgent after truncate
3077 * is finished in osc_cache_truncate_end(). */
3081 ext = next_extent(ext);
3083 osc_object_unlock(obj);
3085 LASSERT(ergo(!discard, list_empty(&discard_list)));
3086 if (!list_empty(&discard_list)) {
3087 struct osc_extent *tmp;
3090 osc_list_maint(osc_cli(obj), obj);
3091 list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
3092 list_del_init(&ext->oe_link);
3093 EASSERT(ext->oe_state == OES_LOCKING, ext);
3095 /* Discard caching pages. We don't actually write this
3096 * extent out but we complete it as if we did. */
3097 rc = osc_extent_make_ready(env, ext);
3098 if (unlikely(rc < 0)) {
3099 OSC_EXTENT_DUMP(D_ERROR, ext,
3100 "make_ready returned %d\n", rc);
3105 /* finish the extent as if the pages were sent */
3106 osc_extent_finish(env, ext, 0, 0);
3111 osc_io_unplug(env, osc_cli(obj), obj);
3113 if (hp || discard) {
3115 rc = osc_cache_wait_range(env, obj, start, end);
3116 if (result >= 0 && rc < 0)
3120 OSC_IO_DEBUG(obj, "pageout [%lu, %lu], %d.\n", start, end, result);
3123 EXPORT_SYMBOL(osc_cache_writeback_range);
3126 * Returns a list of pages by a given [start, end] of \a obj.
3128 * \param resched If not NULL, then we give up before hogging CPU for too
3129 * long and set *resched = 1, in that case caller should implement a retry
3132 * Gang tree lookup (radix_tree_gang_lookup()) optimization is absolutely
3133 * crucial in the face of [offset, EOF] locks.
3135 * Return at least one page in @queue unless there is no covered page.
3137 int osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
3138 struct osc_object *osc, pgoff_t start, pgoff_t end,
3139 osc_page_gang_cbt cb, void *cbdata)
3141 struct osc_page *ops;
3142 struct pagevec *pagevec;
3148 int res = CLP_GANG_OKAY;
3149 bool tree_lock = true;
3153 pvec = osc_env_info(env)->oti_pvec;
3154 pagevec = &osc_env_info(env)->oti_pagevec;
3155 ll_pagevec_init(pagevec, 0);
3156 spin_lock(&osc->oo_tree_lock);
3157 while ((nr = radix_tree_gang_lookup(&osc->oo_tree, pvec,
3158 idx, OTI_PVEC_SIZE)) > 0) {
3159 struct cl_page *page;
3160 bool end_of_region = false;
3162 for (i = 0, j = 0; i < nr; ++i) {
3166 idx = osc_index(ops);
3168 end_of_region = true;
3172 page = ops->ops_cl.cpl_page;
3173 LASSERT(page->cp_type == CPT_CACHEABLE);
3174 if (page->cp_state == CPS_FREEING)
3178 lu_ref_add_atomic(&page->cp_reference,
3179 "gang_lookup", current);
3185 * Here a delicate locking dance is performed. Current thread
3186 * holds a reference to a page, but has to own it before it
3187 * can be placed into queue. Owning implies waiting, so
3188 * radix-tree lock is to be released. After a wait one has to
3189 * check that pages weren't truncated (cl_page_own() returns
3190 * error in the latter case).
3192 spin_unlock(&osc->oo_tree_lock);
3195 for (i = 0; i < j; ++i) {
3197 if (res == CLP_GANG_OKAY)
3198 res = (*cb)(env, io, ops, cbdata);
3200 page = ops->ops_cl.cpl_page;
3201 lu_ref_del(&page->cp_reference, "gang_lookup", current);
3202 cl_pagevec_put(env, page, pagevec);
3204 pagevec_release(pagevec);
3206 if (nr < OTI_PVEC_SIZE || end_of_region)
3209 if (res == CLP_GANG_OKAY && need_resched())
3210 res = CLP_GANG_RESCHED;
3211 if (res != CLP_GANG_OKAY)
3214 spin_lock(&osc->oo_tree_lock);
3218 spin_unlock(&osc->oo_tree_lock);
3221 EXPORT_SYMBOL(osc_page_gang_lookup);
3224 * Check if page @page is covered by an extra lock or discard it.
3226 static int check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
3227 struct osc_page *ops, void *cbdata)
3229 struct osc_thread_info *info = osc_env_info(env);
3230 struct osc_object *osc = cbdata;
3233 index = osc_index(ops);
3234 if (index >= info->oti_fn_index) {
3235 struct ldlm_lock *tmp;
3236 struct cl_page *page = ops->ops_cl.cpl_page;
3238 /* refresh non-overlapped index */
3239 tmp = osc_dlmlock_at_pgoff(env, osc, index,
3240 OSC_DAP_FL_TEST_LOCK);
3242 __u64 end = tmp->l_policy_data.l_extent.end;
3243 /* Cache the first-non-overlapped index so as to skip
3244 * all pages within [index, oti_fn_index). This is safe
3245 * because if tmp lock is canceled, it will discard
3247 info->oti_fn_index = cl_index(osc2cl(osc), end + 1);
3248 if (end == OBD_OBJECT_EOF)
3249 info->oti_fn_index = CL_PAGE_EOF;
3251 } else if (cl_page_own(env, io, page) == 0) {
3252 /* discard the page */
3253 cl_page_discard(env, io, page);
3254 cl_page_disown(env, io, page);
3256 LASSERT(page->cp_state == CPS_FREEING);
3260 info->oti_next_index = index + 1;
3261 return CLP_GANG_OKAY;
3264 int osc_discard_cb(const struct lu_env *env, struct cl_io *io,
3265 struct osc_page *ops, void *cbdata)
3267 struct osc_thread_info *info = osc_env_info(env);
3268 struct cl_page *page = ops->ops_cl.cpl_page;
3270 /* page is top page. */
3271 info->oti_next_index = osc_index(ops) + 1;
3272 if (cl_page_own(env, io, page) == 0) {
3273 if (!ergo(page->cp_type == CPT_CACHEABLE,
3274 !PageDirty(cl_page_vmpage(page))))
3275 CL_PAGE_DEBUG(D_ERROR, env, page,
3276 "discard dirty page?\n");
3278 /* discard the page */
3279 cl_page_discard(env, io, page);
3280 cl_page_disown(env, io, page);
3282 LASSERT(page->cp_state == CPS_FREEING);
3285 return CLP_GANG_OKAY;
3287 EXPORT_SYMBOL(osc_discard_cb);
3290 * Discard pages protected by the given lock. This function traverses radix
3291 * tree to find all covering pages and discard them. If a page is being covered
3292 * by other locks, it should remain in cache.
3294 * If error happens on any step, the process continues anyway (the reasoning
3295 * behind this being that lock cancellation cannot be delayed indefinitely).
3297 int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
3298 pgoff_t start, pgoff_t end, bool discard)
3300 struct osc_thread_info *info = osc_env_info(env);
3301 struct cl_io *io = osc_env_thread_io(env);
3302 osc_page_gang_cbt cb;
3308 io->ci_obj = cl_object_top(osc2cl(osc));
3309 io->ci_ignore_layout = 1;
3310 result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
3314 cb = discard ? osc_discard_cb : check_and_discard_cb;
3315 info->oti_fn_index = info->oti_next_index = start;
3317 res = osc_page_gang_lookup(env, io, osc,
3318 info->oti_next_index, end, cb, osc);
3319 if (info->oti_next_index > end)
3322 if (res == CLP_GANG_RESCHED)
3324 } while (res != CLP_GANG_OKAY);
3326 cl_io_fini(env, io);