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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011 Whamcloud, Inc.
34 * This file is part of Lustre, http://www.lustre.org/
35 * Lustre is a trademark of Sun Microsystems, Inc.
37 * osc cache management.
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
42 #define DEBUG_SUBSYSTEM S_OSC
44 #include "osc_cl_internal.h"
45 #include "osc_internal.h"
47 static int extent_debug; /* set it to be true for more debug */
49 static void osc_update_pending(struct osc_object *obj, int cmd, int delta);
50 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
52 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
53 struct osc_async_page *oap, int sent, int rc);
54 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
56 static int osc_refresh_count(const struct lu_env *env,
57 struct osc_async_page *oap, int cmd);
58 static int osc_io_unplug_async(const struct lu_env *env,
59 struct client_obd *cli, struct osc_object *osc);
60 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
61 unsigned int lost_grant);
63 static void osc_extent_tree_dump0(int level, struct osc_object *obj,
64 const char *func, int line);
65 #define osc_extent_tree_dump(lvl, obj) \
66 osc_extent_tree_dump0(lvl, obj, __func__, __LINE__)
72 /* ------------------ osc extent ------------------ */
73 static inline char *ext_flags(struct osc_extent *ext, char *flags)
76 *buf++ = ext->oe_rw ? 'r' : 'w';
87 if (ext->oe_trunc_pending)
89 if (ext->oe_fsync_wait)
95 static inline char list_empty_marker(cfs_list_t *list)
97 return cfs_list_empty(list) ? '-' : '+';
100 #define EXTSTR "[%lu -> %lu/%lu]"
101 #define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end
103 #define OSC_EXTENT_DUMP(lvl, extent, fmt, ...) do { \
104 struct osc_extent *__ext = (extent); \
105 const char *__str[] = OES_STRINGS; \
109 "extent %p@{" EXTSTR ", " \
110 "[%d|%d|%c|%s|%s|%p], [%d|%d|%c|%c|%p|%u|%p]} " fmt, \
111 /* ----- extent part 0 ----- */ \
112 __ext, EXTPARA(__ext), \
113 /* ----- part 1 ----- */ \
114 cfs_atomic_read(&__ext->oe_refc), \
115 cfs_atomic_read(&__ext->oe_users), \
116 list_empty_marker(&__ext->oe_link), \
117 __str[__ext->oe_state], ext_flags(__ext, __buf), \
119 /* ----- part 2 ----- */ \
120 __ext->oe_grants, __ext->oe_nr_pages, \
121 list_empty_marker(&__ext->oe_pages), \
122 cfs_waitq_active(&__ext->oe_waitq) ? '+' : '-', \
123 __ext->oe_osclock, __ext->oe_mppr, __ext->oe_owner, \
124 /* ----- part 4 ----- */ \
129 #define EASSERTF(expr, ext, fmt, args...) do { \
131 OSC_EXTENT_DUMP(D_ERROR, (ext), fmt, ##args); \
132 osc_extent_tree_dump(D_ERROR, (ext)->oe_obj); \
138 #define EASSERT(expr, ext) EASSERTF(expr, ext, "\n")
140 static inline struct osc_extent *rb_extent(struct rb_node *n)
145 return container_of(n, struct osc_extent, oe_node);
148 static inline struct osc_extent *next_extent(struct osc_extent *ext)
153 LASSERT(ext->oe_intree);
154 return rb_extent(rb_next(&ext->oe_node));
157 static inline struct osc_extent *prev_extent(struct osc_extent *ext)
162 LASSERT(ext->oe_intree);
163 return rb_extent(rb_prev(&ext->oe_node));
166 static inline struct osc_extent *first_extent(struct osc_object *obj)
168 return rb_extent(rb_first(&obj->oo_root));
171 /* object must be locked by caller. */
172 static int osc_extent_sanity_check0(struct osc_extent *ext,
173 const char *func, const int line)
175 struct osc_object *obj = ext->oe_obj;
176 struct osc_async_page *oap;
180 if (!osc_object_is_locked(obj))
183 if (ext->oe_state >= OES_STATE_MAX)
186 if (cfs_atomic_read(&ext->oe_refc) <= 0)
189 if (cfs_atomic_read(&ext->oe_refc) < cfs_atomic_read(&ext->oe_users))
192 switch (ext->oe_state) {
194 if (ext->oe_nr_pages > 0 || !cfs_list_empty(&ext->oe_pages))
199 if (cfs_atomic_read(&ext->oe_users) == 0)
203 if (ext->oe_fsync_wait && !ext->oe_urgent)
207 if (ext->oe_grants == 0)
209 if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp)
212 if (cfs_atomic_read(&ext->oe_users) > 0)
216 if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start)
219 if (ext->oe_osclock == NULL && ext->oe_grants > 0)
222 if (ext->oe_osclock) {
223 struct cl_lock_descr *descr;
224 descr = &ext->oe_osclock->cll_descr;
225 if (!(descr->cld_start <= ext->oe_start &&
226 descr->cld_end >= ext->oe_max_end))
230 if (ext->oe_nr_pages > ext->oe_mppr)
233 /* Do not verify page list if extent is in RPC. This is because an
234 * in-RPC extent is supposed to be exclusively accessible w/o lock. */
235 if (ext->oe_state > OES_CACHE)
242 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
243 pgoff_t index = oap2cl_page(oap)->cp_index;
245 if (index > ext->oe_end || index < ext->oe_start)
248 if (page_count != ext->oe_nr_pages)
253 OSC_EXTENT_DUMP(D_ERROR, ext,
254 "%s:%d sanity check %p failed with rc = %d\n",
255 func, line, ext, rc);
259 #define sanity_check_nolock(ext) \
260 osc_extent_sanity_check0(ext, __func__, __LINE__)
262 #define sanity_check(ext) ({ \
264 osc_object_lock((ext)->oe_obj); \
265 __res = sanity_check_nolock(ext); \
266 osc_object_unlock((ext)->oe_obj); \
272 * sanity check - to make sure there is no overlapped extent in the tree.
274 static int osc_extent_is_overlapped(struct osc_object *obj,
275 struct osc_extent *ext)
277 struct osc_extent *tmp;
279 LASSERT(osc_object_is_locked(obj));
284 for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) {
287 if (tmp->oe_end >= ext->oe_start &&
288 tmp->oe_start <= ext->oe_end)
294 static void osc_extent_state_set(struct osc_extent *ext, int state)
296 LASSERT(osc_object_is_locked(ext->oe_obj));
297 LASSERT(state >= OES_INV && state < OES_STATE_MAX);
299 /* Never try to sanity check a state changing extent :-) */
300 /* LASSERT(sanity_check_nolock(ext) == 0); */
302 /* TODO: validate the state machine */
303 ext->oe_state = state;
304 cfs_waitq_broadcast(&ext->oe_waitq);
307 static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
309 struct osc_extent *ext;
311 OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, CFS_ALLOC_STD);
315 RB_CLEAR_NODE(&ext->oe_node);
317 cfs_atomic_set(&ext->oe_refc, 1);
318 cfs_atomic_set(&ext->oe_users, 0);
319 CFS_INIT_LIST_HEAD(&ext->oe_link);
320 ext->oe_state = OES_INV;
321 CFS_INIT_LIST_HEAD(&ext->oe_pages);
322 cfs_waitq_init(&ext->oe_waitq);
323 ext->oe_osclock = NULL;
328 static void osc_extent_free(struct osc_extent *ext)
330 OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
333 static struct osc_extent *osc_extent_get(struct osc_extent *ext)
335 LASSERT(cfs_atomic_read(&ext->oe_refc) >= 0);
336 cfs_atomic_inc(&ext->oe_refc);
340 static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
342 LASSERT(cfs_atomic_read(&ext->oe_refc) > 0);
343 if (cfs_atomic_dec_and_test(&ext->oe_refc)) {
344 LASSERT(cfs_list_empty(&ext->oe_link));
345 LASSERT(cfs_atomic_read(&ext->oe_users) == 0);
346 LASSERT(ext->oe_state == OES_INV);
347 LASSERT(!ext->oe_intree);
349 if (ext->oe_osclock) {
350 cl_lock_put(env, ext->oe_osclock);
351 ext->oe_osclock = NULL;
353 osc_extent_free(ext);
358 * osc_extent_put_trust() is a special version of osc_extent_put() when
359 * it's known that the caller is not the last user. This is to address the
360 * problem of lacking of lu_env ;-).
362 static void osc_extent_put_trust(struct osc_extent *ext)
364 LASSERT(cfs_atomic_read(&ext->oe_refc) > 1);
365 LASSERT(osc_object_is_locked(ext->oe_obj));
366 cfs_atomic_dec(&ext->oe_refc);
370 * Return the extent which includes pgoff @index, or return the greatest
371 * previous extent in the tree.
373 static struct osc_extent *osc_extent_search(struct osc_object *obj,
376 struct rb_node *n = obj->oo_root.rb_node;
377 struct osc_extent *tmp, *p = NULL;
379 LASSERT(osc_object_is_locked(obj));
382 if (index < tmp->oe_start) {
384 } else if (index > tmp->oe_end) {
395 * Return the extent covering @index, otherwise return NULL.
396 * caller must have held object lock.
398 static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
401 struct osc_extent *ext;
403 ext = osc_extent_search(obj, index);
404 if (ext != NULL && ext->oe_start <= index && index <= ext->oe_end)
405 return osc_extent_get(ext);
409 /* caller must have held object lock. */
410 static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
412 struct rb_node **n = &obj->oo_root.rb_node;
413 struct rb_node *parent = NULL;
414 struct osc_extent *tmp;
416 LASSERT(ext->oe_intree == 0);
417 LASSERT(ext->oe_obj == obj);
418 LASSERT(osc_object_is_locked(obj));
423 if (ext->oe_end < tmp->oe_start)
425 else if (ext->oe_start > tmp->oe_end)
428 EASSERTF(0, tmp, EXTSTR, EXTPARA(ext));
430 rb_link_node(&ext->oe_node, parent, n);
431 rb_insert_color(&ext->oe_node, &obj->oo_root);
436 /* caller must have held object lock. */
437 static void osc_extent_erase(struct osc_extent *ext)
439 struct osc_object *obj = ext->oe_obj;
440 LASSERT(osc_object_is_locked(obj));
441 if (ext->oe_intree) {
442 rb_erase(&ext->oe_node, &obj->oo_root);
444 /* rbtree held a refcount */
445 osc_extent_put_trust(ext);
449 static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
451 struct osc_object *obj = ext->oe_obj;
453 LASSERT(osc_object_is_locked(obj));
454 LASSERT(ext->oe_state == OES_ACTIVE || ext->oe_state == OES_CACHE);
455 if (ext->oe_state == OES_CACHE) {
456 osc_extent_state_set(ext, OES_ACTIVE);
457 osc_update_pending(obj, OBD_BRW_WRITE, -ext->oe_nr_pages);
459 cfs_atomic_inc(&ext->oe_users);
460 cfs_list_del_init(&ext->oe_link);
461 return osc_extent_get(ext);
464 static void __osc_extent_remove(struct osc_extent *ext)
466 LASSERT(osc_object_is_locked(ext->oe_obj));
467 LASSERT(cfs_list_empty(&ext->oe_pages));
468 osc_extent_erase(ext);
469 cfs_list_del_init(&ext->oe_link);
470 osc_extent_state_set(ext, OES_INV);
471 OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
474 static void osc_extent_remove(struct osc_extent *ext)
476 struct osc_object *obj = ext->oe_obj;
478 osc_object_lock(obj);
479 __osc_extent_remove(ext);
480 osc_object_unlock(obj);
484 * This function is used to merge extents to get better performance. It checks
485 * if @cur and @victim are contiguous at chunk level.
487 static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
488 struct osc_extent *victim)
490 struct osc_object *obj = cur->oe_obj;
495 LASSERT(cur->oe_state == OES_CACHE);
496 LASSERT(osc_object_is_locked(obj));
500 if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
503 if (cur->oe_max_end != victim->oe_max_end)
506 LASSERT(cur->oe_osclock == victim->oe_osclock);
507 ppc_bits = osc_cli(obj)->cl_chunkbits - CFS_PAGE_SHIFT;
508 chunk_start = cur->oe_start >> ppc_bits;
509 chunk_end = cur->oe_end >> ppc_bits;
510 if (chunk_start != (victim->oe_end >> ppc_bits) + 1 &&
511 chunk_end + 1 != victim->oe_start >> ppc_bits)
514 OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
516 cur->oe_start = min(cur->oe_start, victim->oe_start);
517 cur->oe_end = max(cur->oe_end, victim->oe_end);
518 cur->oe_grants += victim->oe_grants;
519 cur->oe_nr_pages += victim->oe_nr_pages;
520 /* only the following bits are needed to merge */
521 cur->oe_urgent |= victim->oe_urgent;
522 cur->oe_memalloc |= victim->oe_memalloc;
523 cfs_list_splice_init(&victim->oe_pages, &cur->oe_pages);
524 cfs_list_del_init(&victim->oe_link);
525 victim->oe_nr_pages = 0;
527 osc_extent_get(victim);
528 __osc_extent_remove(victim);
529 osc_extent_put(env, victim);
531 OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
536 * Drop user count of osc_extent, and unplug IO asynchronously.
538 int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
540 struct osc_object *obj = ext->oe_obj;
544 LASSERT(cfs_atomic_read(&ext->oe_users) > 0);
545 LASSERT(sanity_check(ext) == 0);
546 LASSERT(ext->oe_grants > 0);
548 if (cfs_atomic_dec_and_lock(&ext->oe_users, &obj->oo_lock)) {
549 LASSERT(ext->oe_state == OES_ACTIVE);
550 if (ext->oe_trunc_pending) {
551 /* a truncate process is waiting for this extent.
552 * This may happen due to a race, check
553 * osc_cache_truncate_start(). */
554 osc_extent_state_set(ext, OES_TRUNC);
555 ext->oe_trunc_pending = 0;
557 osc_extent_state_set(ext, OES_CACHE);
558 osc_update_pending(obj, OBD_BRW_WRITE,
561 /* try to merge the previous and next extent. */
562 osc_extent_merge(env, ext, prev_extent(ext));
563 osc_extent_merge(env, ext, next_extent(ext));
566 cfs_list_move_tail(&ext->oe_link,
567 &obj->oo_urgent_exts);
569 osc_object_unlock(obj);
571 osc_io_unplug_async(env, osc_cli(obj), obj);
573 osc_extent_put(env, ext);
577 static inline int overlapped(struct osc_extent *ex1, struct osc_extent *ex2)
579 return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
583 * Find or create an extent which includes @index, core function to manage
586 struct osc_extent *osc_extent_find(const struct lu_env *env,
587 struct osc_object *obj, pgoff_t index,
591 struct client_obd *cli = osc_cli(obj);
592 struct cl_lock *lock;
593 struct osc_extent *cur;
594 struct osc_extent *ext;
595 struct osc_extent *conflict = NULL;
596 struct osc_extent *found = NULL;
599 int max_pages; /* max_pages_per_rpc */
601 int ppc_bits; /* pages per chunk bits */
606 cur = osc_extent_alloc(obj);
608 RETURN(ERR_PTR(-ENOMEM));
610 lock = cl_lock_at_pgoff(env, osc2cl(obj), index, NULL, 1, 0);
611 LASSERT(lock != NULL);
612 LASSERT(lock->cll_descr.cld_mode >= CLM_WRITE);
614 LASSERT(cli->cl_chunkbits >= CFS_PAGE_SHIFT);
615 ppc_bits = cli->cl_chunkbits - CFS_PAGE_SHIFT;
616 chunk_mask = ~((1 << ppc_bits) - 1);
617 chunksize = 1 << cli->cl_chunkbits;
618 chunk = index >> ppc_bits;
620 /* align end to rpc edge, rpc size may not be a power 2 integer. */
621 max_pages = cli->cl_max_pages_per_rpc;
622 LASSERT((max_pages & ~chunk_mask) == 0);
623 max_end = index - (index % max_pages) + max_pages - 1;
624 max_end = min_t(pgoff_t, max_end, lock->cll_descr.cld_end);
626 /* initialize new extent by parameters so far */
627 cur->oe_max_end = max_end;
628 cur->oe_start = index & chunk_mask;
629 cur->oe_end = ((index + ~chunk_mask + 1) & chunk_mask) - 1;
630 if (cur->oe_start < lock->cll_descr.cld_start)
631 cur->oe_start = lock->cll_descr.cld_start;
632 if (cur->oe_end > max_end)
633 cur->oe_end = max_end;
634 cur->oe_osclock = lock;
636 cur->oe_mppr = max_pages;
638 /* grants has been allocated by caller */
639 LASSERTF(*grants >= chunksize + cli->cl_extent_tax,
640 "%u/%u/%u.\n", *grants, chunksize, cli->cl_extent_tax);
641 LASSERTF((max_end - cur->oe_start) < max_pages, EXTSTR, EXTPARA(cur));
644 osc_object_lock(obj);
645 ext = osc_extent_search(obj, cur->oe_start);
647 ext = first_extent(obj);
648 while (ext != NULL) {
649 loff_t ext_chk_start = ext->oe_start >> ppc_bits;
650 loff_t ext_chk_end = ext->oe_end >> ppc_bits;
652 LASSERT(sanity_check_nolock(ext) == 0);
653 if (chunk > ext_chk_end + 1)
656 /* if covering by different locks, no chance to match */
657 if (lock != ext->oe_osclock) {
658 EASSERTF(!overlapped(ext, cur), ext,
659 EXTSTR, EXTPARA(cur));
661 ext = next_extent(ext);
665 /* discontiguous chunks? */
666 if (chunk + 1 < ext_chk_start) {
667 ext = next_extent(ext);
671 /* ok, from now on, ext and cur have these attrs:
672 * 1. covered by the same lock
673 * 2. contiguous at chunk level or overlapping. */
675 if (overlapped(ext, cur)) {
676 /* cur is the minimum unit, so overlapping means
678 EASSERTF((ext->oe_start <= cur->oe_start &&
679 ext->oe_end >= cur->oe_end),
680 ext, EXTSTR, EXTPARA(cur));
682 if (ext->oe_state > OES_CACHE || ext->oe_fsync_wait) {
683 /* for simplicity, we wait for this extent to
684 * finish before going forward. */
685 conflict = osc_extent_get(ext);
689 found = osc_extent_hold(ext);
693 /* non-overlapped extent */
694 if (ext->oe_state != OES_CACHE || ext->oe_fsync_wait) {
695 /* we can't do anything for a non OES_CACHE extent, or
696 * if there is someone waiting for this extent to be
697 * flushed, try next one. */
698 ext = next_extent(ext);
702 /* check if they belong to the same rpc slot before trying to
703 * merge. the extents are not overlapped and contiguous at
704 * chunk level to get here. */
705 if (ext->oe_max_end != max_end) {
706 /* if they don't belong to the same RPC slot or
707 * max_pages_per_rpc has ever changed, do not merge. */
708 ext = next_extent(ext);
712 /* it's required that an extent must be contiguous at chunk
713 * level so that we know the whole extent is covered by grant
714 * (the pages in the extent are NOT required to be contiguous).
715 * Otherwise, it will be too much difficult to know which
716 * chunks have grants allocated. */
718 /* try to do front merge - extend ext's start */
719 if (chunk + 1 == ext_chk_start) {
720 /* ext must be chunk size aligned */
721 EASSERT((ext->oe_start & ~chunk_mask) == 0, ext);
723 /* pull ext's start back to cover cur */
724 ext->oe_start = cur->oe_start;
725 ext->oe_grants += chunksize;
726 *grants -= chunksize;
728 found = osc_extent_hold(ext);
729 } else if (chunk == ext_chk_end + 1) {
731 ext->oe_end = cur->oe_end;
732 ext->oe_grants += chunksize;
733 *grants -= chunksize;
735 /* try to merge with the next one because we just fill
737 if (osc_extent_merge(env, ext, next_extent(ext)) == 0)
738 /* we can save extent tax from next extent */
739 *grants += cli->cl_extent_tax;
741 found = osc_extent_hold(ext);
746 ext = next_extent(ext);
749 osc_extent_tree_dump(D_CACHE, obj);
751 LASSERT(conflict == NULL);
752 if (!IS_ERR(found)) {
753 LASSERT(found->oe_osclock == cur->oe_osclock);
754 OSC_EXTENT_DUMP(D_CACHE, found,
755 "found caching ext for %lu.\n", index);
757 } else if (conflict == NULL) {
758 /* create a new extent */
759 EASSERT(osc_extent_is_overlapped(obj, cur) == 0, cur);
760 cur->oe_grants = chunksize + cli->cl_extent_tax;
761 *grants -= cur->oe_grants;
762 LASSERT(*grants >= 0);
764 cur->oe_state = OES_CACHE;
765 found = osc_extent_hold(cur);
766 osc_extent_insert(obj, cur);
767 OSC_EXTENT_DUMP(D_CACHE, cur, "add into tree %lu/%lu.\n",
768 index, lock->cll_descr.cld_end);
770 osc_object_unlock(obj);
772 if (conflict != NULL) {
773 LASSERT(found == NULL);
775 /* waiting for IO to finish. Please notice that it's impossible
776 * to be an OES_TRUNC extent. */
777 rc = osc_extent_wait(env, conflict, OES_INV);
778 osc_extent_put(env, conflict);
781 GOTO(out, found = ERR_PTR(rc));
788 osc_extent_put(env, cur);
789 LASSERT(*grants >= 0);
794 * Called when IO is finished to an extent.
796 int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
799 struct client_obd *cli = osc_cli(ext->oe_obj);
800 struct osc_async_page *oap;
801 struct osc_async_page *tmp;
802 struct osc_async_page *last = NULL;
803 int nr_pages = ext->oe_nr_pages;
805 int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
808 OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n");
810 ext->oe_rc = rc ?: ext->oe_nr_pages;
811 EASSERT(ergo(rc == 0, ext->oe_state == OES_RPC), ext);
812 cfs_list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
814 cfs_list_del_init(&oap->oap_rpc_item);
815 cfs_list_del_init(&oap->oap_pending_item);
816 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
820 osc_ap_completion(env, cli, oap, sent, rc);
822 EASSERT(ext->oe_nr_pages == 0, ext);
825 lost_grant = ext->oe_grants;
826 } else if (blocksize < CFS_PAGE_SIZE &&
827 last->oap_count != CFS_PAGE_SIZE) {
828 /* For short writes we shouldn't count parts of pages that
829 * span a whole chunk on the OST side, or our accounting goes
830 * wrong. Should match the code in filter_grant_check. */
831 int offset = oap->oap_page_off & ~CFS_PAGE_MASK;
832 int count = oap->oap_count + (offset & (blocksize - 1));
833 int end = (offset + oap->oap_count) & (blocksize - 1);
835 count += blocksize - end;
837 lost_grant = CFS_PAGE_SIZE - count;
839 if (ext->oe_grants > 0)
840 osc_free_grant(cli, nr_pages, lost_grant);
842 osc_extent_remove(ext);
843 /* put the refcount for RPC */
844 osc_extent_put(env, ext);
849 * Wait for the extent's state to become @state.
851 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
854 struct osc_object *obj = ext->oe_obj;
855 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
859 osc_object_lock(obj);
860 LASSERT(sanity_check_nolock(ext) == 0);
861 /* `Kick' this extent only if the caller is waiting for it to be
863 if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp) {
864 if (ext->oe_state == OES_ACTIVE) {
866 } else if (ext->oe_state == OES_CACHE) {
868 osc_extent_hold(ext);
872 osc_object_unlock(obj);
874 osc_extent_release(env, ext);
876 /* wait for the extent until its state becomes @state */
877 rc = l_wait_event(ext->oe_waitq, ext->oe_state == state, &lwi);
878 if (rc == 0 && ext->oe_rc < 0)
884 * Discard pages with index greater than @size. If @ext is overlapped with
885 * @size, then partial truncate happens.
887 static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index)
889 struct cl_env_nest nest;
892 struct osc_object *obj = ext->oe_obj;
893 struct client_obd *cli = osc_cli(obj);
894 struct osc_async_page *oap;
895 struct osc_async_page *tmp;
896 int pages_in_chunk = 0;
897 int ppc_bits = cli->cl_chunkbits - CFS_PAGE_SHIFT;
898 __u64 trunc_chunk = trunc_index >> ppc_bits;
904 LASSERT(sanity_check(ext) == 0);
905 LASSERT(ext->oe_state == OES_TRUNC);
906 LASSERT(!ext->oe_urgent);
908 /* Request new lu_env.
909 * We can't use that env from osc_cache_truncate_start() because
910 * it's from lov_io_sub and not fully initialized. */
911 env = cl_env_nested_get(&nest);
912 io = &osc_env_info(env)->oti_io;
913 io->ci_obj = cl_object_top(osc2cl(obj));
914 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
918 /* discard all pages with index greater then trunc_index */
919 cfs_list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
921 struct cl_page *sub = oap2cl_page(oap);
922 struct cl_page *page = cl_page_top(sub);
924 LASSERT(cfs_list_empty(&oap->oap_rpc_item));
926 /* only discard the pages with their index greater than
927 * trunc_index, and ... */
928 if (sub->cp_index < trunc_index) {
929 /* accounting how many pages remaining in the chunk
930 * so that we can calculate grants correctly. */
931 if (sub->cp_index >> ppc_bits == trunc_chunk)
936 cfs_list_del_init(&oap->oap_pending_item);
939 lu_ref_add(&page->cp_reference, "truncate", cfs_current());
941 if (cl_page_own(env, io, page) == 0) {
942 cl_page_unmap(env, io, page);
943 cl_page_discard(env, io, page);
944 cl_page_disown(env, io, page);
946 LASSERT(page->cp_state == CPS_FREEING);
950 lu_ref_del(&page->cp_reference, "truncate", cfs_current());
951 cl_page_put(env, page);
956 EASSERTF(ergo(ext->oe_start >= trunc_index, ext->oe_nr_pages == 0),
957 ext, "trunc_index %lu\n", trunc_index);
959 osc_object_lock(obj);
960 if (ext->oe_nr_pages == 0) {
961 LASSERT(pages_in_chunk == 0);
962 grants = ext->oe_grants;
964 } else { /* calculate how many grants we can free */
965 int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
969 /* if there is no pages in this chunk, we can also free grants
970 * for the last chunk */
971 if (pages_in_chunk == 0) {
972 /* if this is the 1st chunk and no pages in this chunk,
973 * ext->oe_nr_pages must be zero, so we should be in
974 * the other if-clause. */
975 LASSERT(trunc_chunk > 0);
980 /* this is what we can free from this extent */
981 grants = chunks << cli->cl_chunkbits;
982 ext->oe_grants -= grants;
983 last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
984 ext->oe_end = min(last_index, ext->oe_max_end);
985 LASSERT(ext->oe_end >= ext->oe_start);
986 LASSERT(ext->oe_grants > 0);
988 osc_object_unlock(obj);
990 if (grants > 0 || nr_pages > 0)
991 osc_free_grant(cli, nr_pages, grants);
995 cl_env_nested_put(&nest, env);
1000 * This function is used to make the extent prepared for transfer.
1001 * A race with flusing page - ll_writepage() has to be handled cautiously.
1003 static int osc_extent_make_ready(const struct lu_env *env,
1004 struct osc_extent *ext)
1006 struct osc_async_page *oap;
1007 struct osc_async_page *last = NULL;
1008 struct osc_object *obj = ext->oe_obj;
1013 /* we're going to grab page lock, so object lock must not be taken. */
1014 LASSERT(sanity_check(ext) == 0);
1015 /* in locking state, any process should not touch this extent. */
1016 EASSERT(ext->oe_state == OES_LOCKING, ext);
1017 EASSERT(ext->oe_owner != NULL, ext);
1019 OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
1021 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1023 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
1026 /* checking ASYNC_READY is race safe */
1027 if ((oap->oap_async_flags & ASYNC_READY) != 0)
1030 rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
1033 cfs_spin_lock(&oap->oap_lock);
1034 oap->oap_async_flags |= ASYNC_READY;
1035 cfs_spin_unlock(&oap->oap_lock);
1038 LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
1041 LASSERTF(0, "unknown return code: %d\n", rc);
1045 LASSERT(page_count == ext->oe_nr_pages);
1046 LASSERT(last != NULL);
1047 /* the last page is the only one we need to refresh its count by
1048 * the size of file. */
1049 if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
1050 last->oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
1051 LASSERT(last->oap_count > 0);
1052 LASSERT(last->oap_page_off + last->oap_count <= CFS_PAGE_SIZE);
1053 last->oap_async_flags |= ASYNC_COUNT_STABLE;
1056 /* for the rest of pages, we don't need to call osf_refresh_count()
1057 * because it's known they are not the last page */
1058 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1059 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
1060 oap->oap_count = CFS_PAGE_SIZE - oap->oap_page_off;
1061 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1065 osc_object_lock(obj);
1066 osc_extent_state_set(ext, OES_RPC);
1067 osc_object_unlock(obj);
1068 /* get a refcount for RPC. */
1069 osc_extent_get(ext);
1075 * Quick and simple version of osc_extent_find(). This function is frequently
1076 * called to expand the extent for the same IO. To expand the extent, the
1077 * page index must be in the same or next chunk of ext->oe_end.
1079 static int osc_extent_expand(struct osc_extent *ext, pgoff_t index, int *grants)
1081 struct osc_object *obj = ext->oe_obj;
1082 struct client_obd *cli = osc_cli(obj);
1083 struct osc_extent *next;
1084 int ppc_bits = cli->cl_chunkbits - CFS_PAGE_SHIFT;
1085 pgoff_t chunk = index >> ppc_bits;
1088 int chunksize = 1 << cli->cl_chunkbits;
1092 LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
1093 osc_object_lock(obj);
1094 LASSERT(sanity_check_nolock(ext) == 0);
1095 end_chunk = ext->oe_end >> ppc_bits;
1096 if (chunk > end_chunk + 1)
1097 GOTO(out, rc = -ERANGE);
1099 if (end_chunk >= chunk)
1102 LASSERT(end_chunk + 1 == chunk);
1103 /* try to expand this extent to cover @index */
1104 end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
1106 next = next_extent(ext);
1107 if (next != NULL && next->oe_start <= end_index)
1108 /* complex mode - overlapped with the next extent,
1109 * this case will be handled by osc_extent_find() */
1110 GOTO(out, rc = -EAGAIN);
1112 ext->oe_end = end_index;
1113 ext->oe_grants += chunksize;
1114 *grants -= chunksize;
1115 LASSERT(*grants >= 0);
1116 EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
1117 "overlapped after expanding for %lu.\n", index);
1121 osc_object_unlock(obj);
1125 static void osc_extent_tree_dump0(int level, struct osc_object *obj,
1126 const char *func, int line)
1128 struct osc_extent *ext;
1131 CDEBUG(level, "Dump object %p extents at %s:%d, mppr: %u.\n",
1132 obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
1134 /* osc_object_lock(obj); */
1136 for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
1137 OSC_EXTENT_DUMP(level, ext, "in tree %d.\n", cnt++);
1140 cfs_list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
1141 OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++);
1144 cfs_list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
1145 OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++);
1148 cfs_list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
1149 OSC_EXTENT_DUMP(level, ext, "reading %d.\n", cnt++);
1150 /* osc_object_unlock(obj); */
1153 /* ------------------ osc extent end ------------------ */
1155 static inline int osc_is_ready(struct osc_object *osc)
1157 return !cfs_list_empty(&osc->oo_ready_item) ||
1158 !cfs_list_empty(&osc->oo_hp_ready_item);
1161 #define OSC_IO_DEBUG(OSC, STR, args...) \
1162 CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
1163 (OSC), osc_is_ready(OSC), \
1164 list_empty_marker(&(OSC)->oo_hp_ready_item), \
1165 list_empty_marker(&(OSC)->oo_ready_item), \
1166 cfs_atomic_read(&(OSC)->oo_nr_writes), \
1167 list_empty_marker(&(OSC)->oo_hp_exts), \
1168 list_empty_marker(&(OSC)->oo_urgent_exts), \
1169 cfs_atomic_read(&(OSC)->oo_nr_reads), \
1170 list_empty_marker(&(OSC)->oo_reading_exts), \
1173 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
1176 struct osc_page *opg = oap2osc_page(oap);
1177 struct cl_page *page = cl_page_top(oap2cl_page(oap));
1180 LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
1183 result = cl_page_make_ready(env, page, CRT_WRITE);
1185 opg->ops_submit_time = cfs_time_current();
1189 static int osc_refresh_count(const struct lu_env *env,
1190 struct osc_async_page *oap, int cmd)
1192 struct osc_page *opg = oap2osc_page(oap);
1193 struct cl_page *page = oap2cl_page(oap);
1194 struct cl_object *obj;
1195 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1200 /* readpage queues with _COUNT_STABLE, shouldn't get here. */
1201 LASSERT(!(cmd & OBD_BRW_READ));
1202 LASSERT(opg != NULL);
1203 obj = opg->ops_cl.cpl_obj;
1205 cl_object_attr_lock(obj);
1206 result = cl_object_attr_get(env, obj, attr);
1207 cl_object_attr_unlock(obj);
1210 kms = attr->cat_kms;
1211 if (cl_offset(obj, page->cp_index) >= kms)
1212 /* catch race with truncate */
1214 else if (cl_offset(obj, page->cp_index + 1) > kms)
1215 /* catch sub-page write at end of file */
1216 return kms % CFS_PAGE_SIZE;
1218 return CFS_PAGE_SIZE;
1221 static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
1224 struct osc_page *opg = oap2osc_page(oap);
1225 struct cl_page *page = cl_page_top(oap2cl_page(oap));
1226 struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
1227 enum cl_req_type crt;
1232 cmd &= ~OBD_BRW_NOQUOTA;
1233 LASSERT(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ));
1234 LASSERT(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE));
1235 LASSERT(opg->ops_transfer_pinned);
1238 * page->cp_req can be NULL if io submission failed before
1239 * cl_req was allocated.
1241 if (page->cp_req != NULL)
1242 cl_req_page_done(env, page);
1243 LASSERT(page->cp_req == NULL);
1245 crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
1246 /* Clear opg->ops_transfer_pinned before VM lock is released. */
1247 opg->ops_transfer_pinned = 0;
1249 cfs_spin_lock(&obj->oo_seatbelt);
1250 LASSERT(opg->ops_submitter != NULL);
1251 LASSERT(!cfs_list_empty(&opg->ops_inflight));
1252 cfs_list_del_init(&opg->ops_inflight);
1253 opg->ops_submitter = NULL;
1254 cfs_spin_unlock(&obj->oo_seatbelt);
1256 opg->ops_submit_time = 0;
1257 srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
1259 cl_page_completion(env, page, crt, rc);
1262 if (rc == 0 && srvlock) {
1263 struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
1264 struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
1265 int bytes = oap->oap_count;
1267 if (crt == CRT_READ)
1268 stats->os_lockless_reads += bytes;
1270 stats->os_lockless_writes += bytes;
1274 * This has to be the last operation with the page, as locks are
1275 * released in cl_page_completion() and nothing except for the
1276 * reference counter protects page from concurrent reclaim.
1278 lu_ref_del(&page->cp_reference, "transfer", page);
1280 * As page->cp_obj is pinned by a reference from page->cp_req, it is
1281 * safe to call cl_page_put() without risking object destruction in a
1282 * non-blocking context.
1284 cl_page_put(env, page);
1288 #define OSC_DUMP_GRANT(cli, fmt, args...) do { \
1289 struct client_obd *__tmp = (cli); \
1290 CDEBUG(D_CACHE, "%s: { dirty: %ld/%ld dirty_pages: %d/%d " \
1291 "dropped: %ld avail: %ld, reserved: %ld, flight: %d } " fmt, \
1292 __tmp->cl_import->imp_obd->obd_name, \
1293 __tmp->cl_dirty, __tmp->cl_dirty_max, \
1294 cfs_atomic_read(&obd_dirty_pages), obd_max_dirty_pages, \
1295 __tmp->cl_lost_grant, __tmp->cl_avail_grant, \
1296 __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, ##args); \
1299 /* caller must hold loi_list_lock */
1300 static void osc_consume_write_grant(struct client_obd *cli,
1301 struct brw_page *pga)
1303 LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
1304 LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
1305 cfs_atomic_inc(&obd_dirty_pages);
1306 cli->cl_dirty += CFS_PAGE_SIZE;
1307 pga->flag |= OBD_BRW_FROM_GRANT;
1308 CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
1309 CFS_PAGE_SIZE, pga, pga->pg);
1310 osc_update_next_shrink(cli);
1313 /* the companion to osc_consume_write_grant, called when a brw has completed.
1314 * must be called with the loi lock held. */
1315 static void osc_release_write_grant(struct client_obd *cli,
1316 struct brw_page *pga)
1320 LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
1321 if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
1326 pga->flag &= ~OBD_BRW_FROM_GRANT;
1327 cfs_atomic_dec(&obd_dirty_pages);
1328 cli->cl_dirty -= CFS_PAGE_SIZE;
1329 if (pga->flag & OBD_BRW_NOCACHE) {
1330 pga->flag &= ~OBD_BRW_NOCACHE;
1331 cfs_atomic_dec(&obd_dirty_transit_pages);
1332 cli->cl_dirty_transit -= CFS_PAGE_SIZE;
1338 * To avoid sleeping with object lock held, it's good for us allocate enough
1339 * grants before entering into critical section.
1341 * client_obd_list_lock held by caller
1343 static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
1347 if (cli->cl_avail_grant >= bytes) {
1348 cli->cl_avail_grant -= bytes;
1349 cli->cl_reserved_grant += bytes;
1355 static void __osc_unreserve_grant(struct client_obd *cli,
1356 unsigned int reserved, unsigned int unused)
1358 /* it's quite normal for us to get more grant than reserved.
1359 * Thinking about a case that two extents merged by adding a new
1360 * chunk, we can save one extent tax. If extent tax is greater than
1361 * one chunk, we can save more grant by adding a new chunk */
1362 cli->cl_reserved_grant -= reserved;
1363 if (unused > reserved) {
1364 cli->cl_avail_grant += reserved;
1365 cli->cl_lost_grant += unused - reserved;
1367 cli->cl_avail_grant += unused;
1370 osc_wake_cache_waiters(cli);
1373 void osc_unreserve_grant(struct client_obd *cli,
1374 unsigned int reserved, unsigned int unused)
1376 client_obd_list_lock(&cli->cl_loi_list_lock);
1377 __osc_unreserve_grant(cli, reserved, unused);
1378 client_obd_list_unlock(&cli->cl_loi_list_lock);
1382 * Free grant after IO is finished or canceled.
1384 * @lost_grant is used to remember how many grants we have allocated but not
1385 * used, we should return these grants to OST. There're two cases where grants
1388 * 2. blocksize at OST is less than CFS_PAGE_SIZE and a partial page was
1389 * written. In this case OST may use less chunks to serve this partial
1390 * write. OSTs don't actually know the page size on the client side. so
1391 * clients have to calculate lost grant by the blocksize on the OST.
1392 * See filter_grant_check() for details.
1394 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
1395 unsigned int lost_grant)
1397 int grant = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
1399 client_obd_list_lock(&cli->cl_loi_list_lock);
1400 cfs_atomic_sub(nr_pages, &obd_dirty_pages);
1401 cli->cl_dirty -= nr_pages << CFS_PAGE_SHIFT;
1402 cli->cl_lost_grant += lost_grant;
1403 if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) {
1404 /* borrow some grant from truncate to avoid the case that
1405 * truncate uses up all avail grant */
1406 cli->cl_lost_grant -= grant;
1407 cli->cl_avail_grant += grant;
1409 osc_wake_cache_waiters(cli);
1410 client_obd_list_unlock(&cli->cl_loi_list_lock);
1411 CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu\n",
1412 lost_grant, cli->cl_lost_grant,
1413 cli->cl_avail_grant, cli->cl_dirty);
1416 /* The companion to osc_enter_cache(), called when @oap is no longer part of
1417 * the dirty accounting. Writeback completes or truncate happens before
1418 * writing starts. Must be called with the loi lock held. */
1419 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
1421 osc_release_write_grant(cli, &oap->oap_brw_page);
1425 * Non-blocking version of osc_enter_cache() that consumes grant only when it
1428 static int osc_enter_cache_try(struct client_obd *cli,
1429 struct osc_async_page *oap,
1430 int bytes, int transient)
1434 OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
1436 rc = osc_reserve_grant(cli, bytes);
1440 if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
1441 cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages) {
1442 osc_consume_write_grant(cli, &oap->oap_brw_page);
1444 cli->cl_dirty_transit += CFS_PAGE_SIZE;
1445 cfs_atomic_inc(&obd_dirty_transit_pages);
1446 oap->oap_brw_flags |= OBD_BRW_NOCACHE;
1450 __osc_unreserve_grant(cli, bytes, bytes);
1456 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
1457 * grant or cache space. */
1458 static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
1459 struct osc_async_page *oap, int bytes)
1461 struct osc_object *osc = oap->oap_obj;
1462 struct lov_oinfo *loi = osc->oo_oinfo;
1463 struct osc_cache_waiter ocw;
1464 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1468 OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
1470 client_obd_list_lock(&cli->cl_loi_list_lock);
1472 /* force the caller to try sync io. this can jump the list
1473 * of queued writes and create a discontiguous rpc stream */
1474 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
1475 cli->cl_dirty_max < CFS_PAGE_SIZE ||
1476 cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync)
1477 GOTO(out, rc = -EDQUOT);
1479 /* Hopefully normal case - cache space and write credits available */
1480 if (osc_enter_cache_try(cli, oap, bytes, 0))
1483 /* We can get here for two reasons: too many dirty pages in cache, or
1484 * run out of grants. In both cases we should write dirty pages out.
1485 * Adding a cache waiter will trigger urgent write-out no matter what
1487 * The exiting condition is no avail grants and no dirty pages caching,
1488 * that really means there is no space on the OST. */
1489 cfs_waitq_init(&ocw.ocw_waitq);
1491 ocw.ocw_grant = bytes;
1492 while (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) {
1493 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
1495 client_obd_list_unlock(&cli->cl_loi_list_lock);
1497 osc_io_unplug(env, cli, osc, PDL_POLICY_ROUND);
1499 CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
1500 cli->cl_import->imp_obd->obd_name, &ocw, oap);
1502 rc = l_wait_event(ocw.ocw_waitq,
1503 cfs_list_empty(&ocw.ocw_entry), &lwi);
1505 client_obd_list_lock(&cli->cl_loi_list_lock);
1506 cfs_list_del_init(&ocw.ocw_entry);
1513 if (osc_enter_cache_try(cli, oap, bytes, 0)) {
1521 client_obd_list_unlock(&cli->cl_loi_list_lock);
1522 OSC_DUMP_GRANT(cli, "returned %d.\n", rc);
1526 /* caller must hold loi_list_lock */
1527 void osc_wake_cache_waiters(struct client_obd *cli)
1529 cfs_list_t *l, *tmp;
1530 struct osc_cache_waiter *ocw;
1533 cfs_list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
1534 /* if we can't dirty more, we must wait until some is written */
1535 if ((cli->cl_dirty + CFS_PAGE_SIZE > cli->cl_dirty_max) ||
1536 (cfs_atomic_read(&obd_dirty_pages) + 1 >
1537 obd_max_dirty_pages)) {
1538 CDEBUG(D_CACHE, "no dirty room: dirty: %ld "
1539 "osc max %ld, sys max %d\n", cli->cl_dirty,
1540 cli->cl_dirty_max, obd_max_dirty_pages);
1544 /* if still dirty cache but no grant wait for pending RPCs that
1545 * may yet return us some grant before doing sync writes */
1546 if (cli->cl_w_in_flight && cli->cl_avail_grant < CFS_PAGE_SIZE) {
1547 CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n",
1548 cli->cl_w_in_flight);
1552 ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry);
1553 cfs_list_del_init(&ocw->ocw_entry);
1556 if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0))
1557 ocw->ocw_rc = -EDQUOT;
1559 CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld, %d\n",
1560 ocw, ocw->ocw_oap, cli->cl_avail_grant, ocw->ocw_rc);
1562 cfs_waitq_signal(&ocw->ocw_waitq);
1568 static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
1570 int hprpc = !!cfs_list_empty(&osc->oo_hp_exts);
1571 return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
1574 /* This maintains the lists of pending pages to read/write for a given object
1575 * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
1576 * to quickly find objects that are ready to send an RPC. */
1577 static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
1580 int invalid_import = 0;
1583 /* if we have an invalid import we want to drain the queued pages
1584 * by forcing them through rpcs that immediately fail and complete
1585 * the pages. recovery relies on this to empty the queued pages
1586 * before canceling the locks and evicting down the llite pages */
1587 if ((cli->cl_import == NULL || cli->cl_import->imp_invalid))
1590 if (cmd & OBD_BRW_WRITE) {
1591 if (cfs_atomic_read(&osc->oo_nr_writes) == 0)
1593 if (invalid_import) {
1594 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1597 if (!cfs_list_empty(&osc->oo_hp_exts)) {
1598 CDEBUG(D_CACHE, "high prio request forcing RPC\n");
1601 if (!cfs_list_empty(&osc->oo_urgent_exts)) {
1602 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1605 /* trigger a write rpc stream as long as there are dirtiers
1606 * waiting for space. as they're waiting, they're not going to
1607 * create more pages to coalesce with what's waiting.. */
1608 if (!cfs_list_empty(&cli->cl_cache_waiters)) {
1609 CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1612 if (cfs_atomic_read(&osc->oo_nr_writes) >=
1613 cli->cl_max_pages_per_rpc)
1616 if (cfs_atomic_read(&osc->oo_nr_reads) == 0)
1618 if (invalid_import) {
1619 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1622 /* all read are urgent. */
1623 if (!cfs_list_empty(&osc->oo_reading_exts))
1630 static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
1632 struct client_obd *cli = osc_cli(obj);
1633 if (cmd & OBD_BRW_WRITE) {
1634 cfs_atomic_add(delta, &obj->oo_nr_writes);
1635 cfs_atomic_add(delta, &cli->cl_pending_w_pages);
1636 LASSERT(cfs_atomic_read(&obj->oo_nr_writes) >= 0);
1638 cfs_atomic_add(delta, &obj->oo_nr_reads);
1639 cfs_atomic_add(delta, &cli->cl_pending_r_pages);
1640 LASSERT(cfs_atomic_read(&obj->oo_nr_reads) >= 0);
1642 OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
1645 static int osc_makes_hprpc(struct osc_object *obj)
1647 return !cfs_list_empty(&obj->oo_hp_exts);
1650 static void on_list(cfs_list_t *item, cfs_list_t *list, int should_be_on)
1652 if (cfs_list_empty(item) && should_be_on)
1653 cfs_list_add_tail(item, list);
1654 else if (!cfs_list_empty(item) && !should_be_on)
1655 cfs_list_del_init(item);
1658 /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
1659 * can find pages to build into rpcs quickly */
1660 static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1662 if (osc_makes_hprpc(osc)) {
1664 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
1665 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
1667 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
1668 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
1669 osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
1670 osc_makes_rpc(cli, osc, OBD_BRW_READ));
1673 on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
1674 cfs_atomic_read(&osc->oo_nr_writes) > 0);
1676 on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
1677 cfs_atomic_read(&osc->oo_nr_reads) > 0);
1679 return osc_is_ready(osc);
1682 static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1686 client_obd_list_lock(&cli->cl_loi_list_lock);
1687 is_ready = __osc_list_maint(cli, osc);
1688 client_obd_list_unlock(&cli->cl_loi_list_lock);
1693 /* this is trying to propogate async writeback errors back up to the
1694 * application. As an async write fails we record the error code for later if
1695 * the app does an fsync. As long as errors persist we force future rpcs to be
1696 * sync so that the app can get a sync error and break the cycle of queueing
1697 * pages for which writeback will fail. */
1698 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
1705 ar->ar_force_sync = 1;
1706 ar->ar_min_xid = ptlrpc_sample_next_xid();
1711 if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
1712 ar->ar_force_sync = 0;
1715 /* this must be called holding the loi list lock to give coverage to exit_cache,
1716 * async_flag maintenance, and oap_request */
1717 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
1718 struct osc_async_page *oap, int sent, int rc)
1720 struct osc_object *osc = oap->oap_obj;
1721 struct lov_oinfo *loi = osc->oo_oinfo;
1725 if (oap->oap_request != NULL) {
1726 xid = ptlrpc_req_xid(oap->oap_request);
1727 ptlrpc_req_finished(oap->oap_request);
1728 oap->oap_request = NULL;
1731 /* As the transfer for this page is being done, clear the flags */
1732 cfs_spin_lock(&oap->oap_lock);
1733 oap->oap_async_flags = 0;
1734 cfs_spin_unlock(&oap->oap_lock);
1735 oap->oap_interrupted = 0;
1737 if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
1738 client_obd_list_lock(&cli->cl_loi_list_lock);
1739 osc_process_ar(&cli->cl_ar, xid, rc);
1740 osc_process_ar(&loi->loi_ar, xid, rc);
1741 client_obd_list_unlock(&cli->cl_loi_list_lock);
1744 rc = osc_completion(env, oap, oap->oap_cmd, rc);
1746 CERROR("completion on oap %p obj %p returns %d.\n",
1753 * Try to add extent to one RPC. We need to think about the following things:
1754 * - # of pages must not be over max_pages_per_rpc
1755 * - extent must be compatible with previous ones
1757 static int try_to_add_extent_for_io(struct client_obd *cli,
1758 struct osc_extent *ext, cfs_list_t *rpclist,
1759 int *pc, unsigned int *max_pages)
1761 struct osc_extent *tmp;
1764 EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
1767 *max_pages = max(ext->oe_mppr, *max_pages);
1768 if (*pc + ext->oe_nr_pages > *max_pages)
1771 cfs_list_for_each_entry(tmp, rpclist, oe_link) {
1772 EASSERT(tmp->oe_owner == cfs_current(), tmp);
1774 if (overlapped(tmp, ext)) {
1775 OSC_EXTENT_DUMP(D_ERROR, tmp, "overlapped %p.\n", ext);
1780 if (tmp->oe_srvlock != ext->oe_srvlock ||
1781 !tmp->oe_grants != !ext->oe_grants)
1784 /* remove break for strict check */
1788 *pc += ext->oe_nr_pages;
1789 cfs_list_move_tail(&ext->oe_link, rpclist);
1790 ext->oe_owner = cfs_current();
1795 * In order to prevent multiple ptlrpcd from breaking contiguous extents,
1796 * get_write_extent() takes all appropriate extents in atomic.
1798 * The following policy is used to collect extents for IO:
1799 * 1. Add as many HP extents as possible;
1800 * 2. Add the first urgent extent in urgent extent list and take it out of
1802 * 3. Add subsequent extents of this urgent extent;
1803 * 4. If urgent list is not empty, goto 2;
1804 * 5. Traverse the extent tree from the 1st extent;
1805 * 6. Above steps exit if there is no space in this RPC.
1807 static int get_write_extents(struct osc_object *obj, cfs_list_t *rpclist)
1809 struct client_obd *cli = osc_cli(obj);
1810 struct osc_extent *ext;
1812 unsigned int max_pages = cli->cl_max_pages_per_rpc;
1814 LASSERT(osc_object_is_locked(obj));
1815 while (!cfs_list_empty(&obj->oo_hp_exts)) {
1816 ext = cfs_list_entry(obj->oo_hp_exts.next, struct osc_extent,
1818 LASSERT(ext->oe_state == OES_CACHE);
1819 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1822 EASSERT(ext->oe_nr_pages <= max_pages, ext);
1824 if (page_count == max_pages)
1827 while (!cfs_list_empty(&obj->oo_urgent_exts)) {
1828 ext = cfs_list_entry(obj->oo_urgent_exts.next,
1829 struct osc_extent, oe_link);
1830 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1834 if (!ext->oe_intree)
1837 while ((ext = next_extent(ext)) != NULL) {
1838 if ((ext->oe_state != OES_CACHE) ||
1839 (!cfs_list_empty(&ext->oe_link) &&
1840 ext->oe_owner != NULL))
1843 if (!try_to_add_extent_for_io(cli, ext, rpclist,
1844 &page_count, &max_pages))
1848 if (page_count == max_pages)
1851 ext = first_extent(obj);
1852 while (ext != NULL) {
1853 if ((ext->oe_state != OES_CACHE) ||
1854 /* this extent may be already in current rpclist */
1855 (!cfs_list_empty(&ext->oe_link) && ext->oe_owner != NULL)) {
1856 ext = next_extent(ext);
1860 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1864 ext = next_extent(ext);
1870 osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
1871 struct osc_object *osc, pdl_policy_t pol)
1873 CFS_LIST_HEAD(rpclist);
1874 struct osc_extent *ext;
1875 struct osc_extent *tmp;
1876 struct osc_extent *first = NULL;
1877 obd_count page_count = 0;
1882 LASSERT(osc_object_is_locked(osc));
1884 page_count = get_write_extents(osc, &rpclist);
1885 LASSERT(equi(page_count == 0, cfs_list_empty(&rpclist)));
1887 if (cfs_list_empty(&rpclist))
1890 osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
1892 cfs_list_for_each_entry(ext, &rpclist, oe_link) {
1893 LASSERT(ext->oe_state == OES_CACHE ||
1894 ext->oe_state == OES_LOCK_DONE);
1895 if (ext->oe_state == OES_CACHE)
1896 osc_extent_state_set(ext, OES_LOCKING);
1898 osc_extent_state_set(ext, OES_RPC);
1901 /* we're going to grab page lock, so release object lock because
1902 * lock order is page lock -> object lock. */
1903 osc_object_unlock(osc);
1905 cfs_list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
1906 if (ext->oe_state == OES_LOCKING) {
1907 rc = osc_extent_make_ready(env, ext);
1908 if (unlikely(rc < 0)) {
1909 cfs_list_del_init(&ext->oe_link);
1910 osc_extent_finish(env, ext, 0, rc);
1914 if (first == NULL) {
1916 srvlock = ext->oe_srvlock;
1918 LASSERT(srvlock == ext->oe_srvlock);
1922 if (!cfs_list_empty(&rpclist)) {
1923 LASSERT(page_count > 0);
1924 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE, pol);
1925 LASSERT(cfs_list_empty(&rpclist));
1928 osc_object_lock(osc);
1933 * prepare pages for ASYNC io and put pages in send queue.
1935 * \param cmd OBD_BRW_* macroses
1936 * \param lop pending pages
1938 * \return zero if no page added to send queue.
1939 * \return 1 if pages successfully added to send queue.
1940 * \return negative on errors.
1943 osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
1944 struct osc_object *osc, pdl_policy_t pol)
1946 struct osc_extent *ext;
1947 struct osc_extent *next;
1948 CFS_LIST_HEAD(rpclist);
1950 unsigned int max_pages = cli->cl_max_pages_per_rpc;
1954 LASSERT(osc_object_is_locked(osc));
1955 cfs_list_for_each_entry_safe(ext, next,
1956 &osc->oo_reading_exts, oe_link) {
1957 EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
1958 if (!try_to_add_extent_for_io(cli, ext, &rpclist, &page_count,
1961 osc_extent_state_set(ext, OES_RPC);
1962 EASSERT(ext->oe_nr_pages <= max_pages, ext);
1964 LASSERT(page_count <= max_pages);
1966 osc_update_pending(osc, OBD_BRW_READ, -page_count);
1968 if (!cfs_list_empty(&rpclist)) {
1969 osc_object_unlock(osc);
1971 LASSERT(page_count > 0);
1972 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ, pol);
1973 LASSERT(cfs_list_empty(&rpclist));
1975 osc_object_lock(osc);
1980 #define list_to_obj(list, item) ({ \
1981 cfs_list_t *__tmp = (list)->next; \
1982 cfs_list_del_init(__tmp); \
1983 cfs_list_entry(__tmp, struct osc_object, oo_##item); \
1986 /* This is called by osc_check_rpcs() to find which objects have pages that
1987 * we could be sending. These lists are maintained by osc_makes_rpc(). */
1988 static struct osc_object *osc_next_obj(struct client_obd *cli)
1992 /* First return objects that have blocked locks so that they
1993 * will be flushed quickly and other clients can get the lock,
1994 * then objects which have pages ready to be stuffed into RPCs */
1995 if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
1996 RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
1997 if (!cfs_list_empty(&cli->cl_loi_ready_list))
1998 RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
2000 /* then if we have cache waiters, return all objects with queued
2001 * writes. This is especially important when many small files
2002 * have filled up the cache and not been fired into rpcs because
2003 * they don't pass the nr_pending/object threshhold */
2004 if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2005 !cfs_list_empty(&cli->cl_loi_write_list))
2006 RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
2008 /* then return all queued objects when we have an invalid import
2009 * so that they get flushed */
2010 if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2011 if (!cfs_list_empty(&cli->cl_loi_write_list))
2012 RETURN(list_to_obj(&cli->cl_loi_write_list,
2014 if (!cfs_list_empty(&cli->cl_loi_read_list))
2015 RETURN(list_to_obj(&cli->cl_loi_read_list,
2021 /* called with the loi list lock held */
2022 static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli,
2025 struct osc_object *osc;
2029 while ((osc = osc_next_obj(cli)) != NULL) {
2030 struct cl_object *obj = osc2cl(osc);
2031 struct lu_ref_link *link;
2033 OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
2035 if (osc_max_rpc_in_flight(cli, osc)) {
2036 __osc_list_maint(cli, osc);
2041 client_obd_list_unlock(&cli->cl_loi_list_lock);
2042 link = lu_object_ref_add(&obj->co_lu, "check", cfs_current());
2044 /* attempt some read/write balancing by alternating between
2045 * reads and writes in an object. The makes_rpc checks here
2046 * would be redundant if we were getting read/write work items
2047 * instead of objects. we don't want send_oap_rpc to drain a
2048 * partial read pending queue when we're given this object to
2049 * do io on writes while there are cache waiters */
2050 osc_object_lock(osc);
2051 if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
2052 rc = osc_send_write_rpc(env, cli, osc, pol);
2054 CERROR("Write request failed with %d\n", rc);
2056 /* osc_send_write_rpc failed, mostly because of
2059 * It can't break here, because if:
2060 * - a page was submitted by osc_io_submit, so
2062 * - no request in flight
2063 * - no subsequent request
2064 * The system will be in live-lock state,
2065 * because there is no chance to call
2066 * osc_io_unplug() and osc_check_rpcs() any
2067 * more. pdflush can't help in this case,
2068 * because it might be blocked at grabbing
2069 * the page lock as we mentioned.
2071 * Anyway, continue to drain pages. */
2075 if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
2076 rc = osc_send_read_rpc(env, cli, osc, pol);
2078 CERROR("Read request failed with %d\n", rc);
2080 osc_object_unlock(osc);
2082 osc_list_maint(cli, osc);
2083 lu_object_ref_del_at(&obj->co_lu, link, "check", cfs_current());
2084 cl_object_put(env, obj);
2086 client_obd_list_lock(&cli->cl_loi_list_lock);
2090 static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
2091 struct osc_object *osc, pdl_policy_t pol, int async)
2096 client_obd_list_lock(&cli->cl_loi_list_lock);
2098 has_rpcs = __osc_list_maint(cli, osc);
2101 osc_check_rpcs(env, cli, pol);
2103 CDEBUG(D_CACHE, "Queue writeback work for client %p.\n",
2105 LASSERT(cli->cl_writeback_work != NULL);
2106 rc = ptlrpcd_queue_work(cli->cl_writeback_work);
2109 client_obd_list_unlock(&cli->cl_loi_list_lock);
2113 static int osc_io_unplug_async(const struct lu_env *env,
2114 struct client_obd *cli, struct osc_object *osc)
2116 /* XXX: policy is no use actually. */
2117 return osc_io_unplug0(env, cli, osc, PDL_POLICY_ROUND, 1);
2120 void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
2121 struct osc_object *osc, pdl_policy_t pol)
2123 (void)osc_io_unplug0(env, cli, osc, pol, 0);
2126 int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
2127 cfs_page_t *page, loff_t offset)
2129 struct obd_export *exp = osc_export(osc);
2130 struct osc_async_page *oap = &ops->ops_oap;
2134 return cfs_size_round(sizeof(*oap));
2136 oap->oap_magic = OAP_MAGIC;
2137 oap->oap_cli = &exp->exp_obd->u.cli;
2140 oap->oap_page = page;
2141 oap->oap_obj_off = offset;
2142 LASSERT(!(offset & ~CFS_PAGE_MASK));
2144 if (!client_is_remote(exp) && cfs_capable(CFS_CAP_SYS_RESOURCE))
2145 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2147 CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2148 CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2150 cfs_spin_lock_init(&oap->oap_lock);
2151 CDEBUG(D_INFO, "oap %p page %p obj off "LPU64"\n",
2152 oap, page, oap->oap_obj_off);
2156 int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
2157 struct osc_page *ops)
2159 struct osc_io *oio = osc_env_io(env);
2160 struct osc_extent *ext = NULL;
2161 struct osc_async_page *oap = &ops->ops_oap;
2162 struct client_obd *cli = oap->oap_cli;
2163 struct osc_object *osc = oap->oap_obj;
2166 int brw_flags = OBD_BRW_ASYNC;
2167 int cmd = OBD_BRW_WRITE;
2168 int need_release = 0;
2172 if (oap->oap_magic != OAP_MAGIC)
2175 if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2178 if (!cfs_list_empty(&oap->oap_pending_item) ||
2179 !cfs_list_empty(&oap->oap_rpc_item))
2182 /* Set the OBD_BRW_SRVLOCK before the page is queued. */
2183 brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
2184 if (!client_is_remote(osc_export(osc)) &&
2185 cfs_capable(CFS_CAP_SYS_RESOURCE)) {
2186 brw_flags |= OBD_BRW_NOQUOTA;
2187 cmd |= OBD_BRW_NOQUOTA;
2190 /* check if the file's owner/group is over quota */
2191 if (!(cmd & OBD_BRW_NOQUOTA)) {
2192 struct cl_object *obj;
2193 struct cl_attr *attr;
2194 unsigned int qid[MAXQUOTAS];
2196 obj = cl_object_top(&osc->oo_cl);
2197 attr = &osc_env_info(env)->oti_attr;
2199 cl_object_attr_lock(obj);
2200 rc = cl_object_attr_get(env, obj, attr);
2201 cl_object_attr_unlock(obj);
2203 qid[USRQUOTA] = attr->cat_uid;
2204 qid[GRPQUOTA] = attr->cat_gid;
2205 if (rc == 0 && osc_quota_chkdq(cli, qid) == NO_QUOTA)
2212 oap->oap_page_off = ops->ops_from;
2213 oap->oap_count = ops->ops_to - ops->ops_from;
2214 oap->oap_async_flags = 0;
2215 oap->oap_brw_flags = brw_flags;
2217 OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
2218 oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
2220 index = oap2cl_page(oap)->cp_index;
2222 /* Add this page into extent by the following steps:
2223 * 1. if there exists an active extent for this IO, mostly this page
2224 * can be added to the active extent and sometimes we need to
2225 * expand extent to accomodate this page;
2226 * 2. otherwise, a new extent will be allocated. */
2228 ext = oio->oi_active;
2229 if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) {
2230 /* one chunk plus extent overhead must be enough to write this
2232 grants = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
2233 if (ext->oe_end >= index)
2236 /* it doesn't need any grant to dirty this page */
2237 client_obd_list_lock(&cli->cl_loi_list_lock);
2238 rc = osc_enter_cache_try(cli, oap, grants, 0);
2239 client_obd_list_unlock(&cli->cl_loi_list_lock);
2240 if (rc == 0) { /* try failed */
2243 } else if (ext->oe_end < index) {
2245 /* try to expand this extent */
2246 rc = osc_extent_expand(ext, index, &tmp);
2249 /* don't free reserved grant */
2251 OSC_EXTENT_DUMP(D_CACHE, ext,
2252 "expanded for %lu.\n", index);
2253 osc_unreserve_grant(cli, grants, tmp);
2258 } else if (ext != NULL) {
2259 /* index is located outside of active extent */
2263 osc_extent_release(env, ext);
2264 oio->oi_active = NULL;
2269 int tmp = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
2271 /* try to find new extent to cover this page */
2272 LASSERT(oio->oi_active == NULL);
2273 /* we may have allocated grant for this page if we failed
2274 * to expand the previous active extent. */
2275 LASSERT(ergo(grants > 0, grants >= tmp));
2279 /* we haven't allocated grant for this page. */
2280 rc = osc_enter_cache(env, cli, oap, tmp);
2287 ext = osc_extent_find(env, osc, index, &tmp);
2289 LASSERT(tmp == grants);
2290 osc_exit_cache(cli, oap);
2294 oio->oi_active = ext;
2298 osc_unreserve_grant(cli, grants, tmp);
2301 LASSERT(ergo(rc == 0, ext != NULL));
2303 EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
2304 ext, "index = %lu.\n", index);
2305 LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
2307 osc_object_lock(osc);
2308 if (ext->oe_nr_pages == 0)
2309 ext->oe_srvlock = ops->ops_srvlock;
2311 LASSERT(ext->oe_srvlock == ops->ops_srvlock);
2313 cfs_list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
2314 osc_object_unlock(osc);
2319 int osc_teardown_async_page(const struct lu_env *env,
2320 struct osc_object *obj, struct osc_page *ops)
2322 struct osc_async_page *oap = &ops->ops_oap;
2323 struct osc_extent *ext = NULL;
2327 LASSERT(oap->oap_magic == OAP_MAGIC);
2329 CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
2330 oap, ops, oap2cl_page(oap)->cp_index);
2332 osc_object_lock(obj);
2333 if (!cfs_list_empty(&oap->oap_rpc_item)) {
2334 CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
2336 } else if (!cfs_list_empty(&oap->oap_pending_item)) {
2337 ext = osc_extent_lookup(obj, oap2cl_page(oap)->cp_index);
2338 /* only truncated pages are allowed to be taken out.
2339 * See osc_extent_truncate() and osc_cache_truncate_start()
2341 if (ext != NULL && ext->oe_state != OES_TRUNC) {
2342 OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
2343 oap2cl_page(oap)->cp_index);
2347 osc_object_unlock(obj);
2349 osc_extent_put(env, ext);
2354 * This is called when a page is picked up by kernel to write out.
2356 * We should find out the corresponding extent and add the whole extent
2357 * into urgent list. The extent may be being truncated or used, handle it
2360 int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
2361 struct osc_page *ops)
2363 struct osc_extent *ext = NULL;
2364 struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
2365 struct cl_page *cp = ops->ops_cl.cpl_page;
2366 pgoff_t index = cp->cp_index;
2367 struct osc_async_page *oap = &ops->ops_oap;
2372 osc_object_lock(obj);
2373 ext = osc_extent_lookup(obj, index);
2375 osc_extent_tree_dump(D_ERROR, obj);
2376 LASSERTF(0, "page index %lu is NOT covered.\n", index);
2379 switch (ext->oe_state) {
2382 CL_PAGE_DEBUG(D_ERROR, env, cl_page_top(cp),
2383 "flush an in-rpc page?\n");
2387 /* If we know this extent is being written out, we should abort
2388 * so that the writer can make this page ready. Otherwise, there
2389 * exists a deadlock problem because other process can wait for
2390 * page writeback bit holding page lock; and meanwhile in
2391 * vvp_page_make_ready(), we need to grab page lock before
2392 * really sending the RPC. */
2394 /* race with truncate, page will be redirtied */
2395 GOTO(out, rc = -EAGAIN);
2400 rc = cl_page_prep(env, io, cl_page_top(cp), CRT_WRITE);
2404 cfs_spin_lock(&oap->oap_lock);
2405 oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
2406 cfs_spin_unlock(&oap->oap_lock);
2408 if (cfs_memory_pressure_get())
2409 ext->oe_memalloc = 1;
2412 if (ext->oe_state == OES_CACHE && cfs_list_empty(&ext->oe_link)) {
2413 OSC_EXTENT_DUMP(D_CACHE, ext,
2414 "flush page %p make it urgent.\n", oap);
2415 cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2422 osc_object_unlock(obj);
2423 osc_extent_put(env, ext);
2425 osc_io_unplug_async(env, osc_cli(obj), obj);
2430 * this is called when a sync waiter receives an interruption. Its job is to
2431 * get the caller woken as soon as possible. If its page hasn't been put in an
2432 * rpc yet it can dequeue immediately. Otherwise it has to mark the rpc as
2433 * desiring interruption which will forcefully complete the rpc once the rpc
2436 int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops)
2438 struct osc_async_page *oap = &ops->ops_oap;
2439 struct osc_object *obj = oap->oap_obj;
2440 struct client_obd *cli = osc_cli(obj);
2441 struct osc_extent *ext;
2442 struct osc_extent *found = NULL;
2444 pgoff_t index = oap2cl_page(oap)->cp_index;
2449 LASSERT(!oap->oap_interrupted);
2450 oap->oap_interrupted = 1;
2452 /* Find out the caching extent */
2453 osc_object_lock(obj);
2454 if (oap->oap_cmd & OBD_BRW_WRITE) {
2455 plist = &obj->oo_urgent_exts;
2456 cmd = OBD_BRW_WRITE;
2458 plist = &obj->oo_reading_exts;
2461 cfs_list_for_each_entry(ext, plist, oe_link) {
2462 if (ext->oe_start <= index && ext->oe_end >= index) {
2463 LASSERT(ext->oe_state == OES_LOCK_DONE);
2464 /* For OES_LOCK_DONE state extent, it has already held
2465 * a refcount for RPC. */
2466 found = osc_extent_get(ext);
2470 if (found != NULL) {
2471 cfs_list_del_init(&found->oe_link);
2472 osc_update_pending(obj, cmd, -found->oe_nr_pages);
2473 osc_object_unlock(obj);
2475 osc_extent_finish(env, found, 0, -EINTR);
2476 osc_extent_put(env, found);
2479 osc_object_unlock(obj);
2480 /* ok, it's been put in an rpc. only one oap gets a request
2482 if (oap->oap_request != NULL) {
2483 ptlrpc_mark_interrupted(oap->oap_request);
2484 ptlrpcd_wake(oap->oap_request);
2485 ptlrpc_req_finished(oap->oap_request);
2486 oap->oap_request = NULL;
2490 osc_list_maint(cli, obj);
2494 int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
2495 cfs_list_t *list, int cmd, int brw_flags)
2497 struct client_obd *cli = osc_cli(obj);
2498 struct osc_extent *ext;
2499 struct osc_async_page *oap;
2501 int mppr = cli->cl_max_pages_per_rpc;
2502 pgoff_t start = CL_PAGE_EOF;
2506 cfs_list_for_each_entry(oap, list, oap_pending_item) {
2507 struct cl_page *cp = oap2cl_page(oap);
2508 if (cp->cp_index > end)
2510 if (cp->cp_index < start)
2511 start = cp->cp_index;
2513 mppr <<= (page_count > mppr);
2516 ext = osc_extent_alloc(obj);
2518 cfs_list_for_each_entry(oap, list, oap_pending_item) {
2519 cfs_list_del_init(&oap->oap_pending_item);
2520 osc_ap_completion(env, cli, oap, 0, -ENOMEM);
2525 ext->oe_rw = !!(cmd & OBD_BRW_READ);
2527 ext->oe_start = start;
2528 ext->oe_end = ext->oe_max_end = end;
2530 ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
2531 ext->oe_nr_pages = page_count;
2532 ext->oe_mppr = mppr;
2533 cfs_list_splice_init(list, &ext->oe_pages);
2535 osc_object_lock(obj);
2536 /* Reuse the initial refcount for RPC, don't drop it */
2537 osc_extent_state_set(ext, OES_LOCK_DONE);
2538 if (cmd & OBD_BRW_WRITE) {
2539 cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2540 osc_update_pending(obj, OBD_BRW_WRITE, page_count);
2542 cfs_list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
2543 osc_update_pending(obj, OBD_BRW_READ, page_count);
2545 osc_object_unlock(obj);
2547 osc_io_unplug(env, cli, obj, PDL_POLICY_ROUND);
2552 * Called by osc_io_setattr_start() to freeze and destroy covering extents.
2554 int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
2555 struct osc_object *obj, __u64 size)
2557 struct client_obd *cli = osc_cli(obj);
2558 struct osc_extent *ext;
2559 struct osc_extent *waiting = NULL;
2561 CFS_LIST_HEAD(list);
2565 /* pages with index greater or equal to index will be truncated. */
2566 index = cl_index(osc2cl(obj), size + CFS_PAGE_SIZE - 1);
2569 osc_object_lock(obj);
2570 ext = osc_extent_search(obj, index);
2572 ext = first_extent(obj);
2573 else if (ext->oe_end < index)
2574 ext = next_extent(ext);
2575 while (ext != NULL) {
2576 EASSERT(ext->oe_state != OES_TRUNC, ext);
2578 if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
2579 /* if ext is in urgent state, it means there must exist
2580 * a page already having been flushed by write_page().
2581 * We have to wait for this extent because we can't
2582 * truncate that page. */
2583 LASSERT(!ext->oe_hp);
2584 OSC_EXTENT_DUMP(D_CACHE, ext,
2585 "waiting for busy extent\n");
2586 waiting = osc_extent_get(ext);
2590 osc_extent_get(ext);
2591 if (ext->oe_state == OES_ACTIVE) {
2592 /* though we grab inode mutex for write path, but we
2593 * release it before releasing extent(in osc_io_end()),
2594 * so there is a race window that an extent is still
2595 * in OES_ACTIVE when truncate starts. */
2596 LASSERT(!ext->oe_trunc_pending);
2597 ext->oe_trunc_pending = 1;
2599 EASSERT(ext->oe_state == OES_CACHE, ext);
2600 osc_extent_state_set(ext, OES_TRUNC);
2601 osc_update_pending(obj, OBD_BRW_WRITE,
2604 EASSERT(cfs_list_empty(&ext->oe_link), ext);
2605 cfs_list_add_tail(&ext->oe_link, &list);
2607 ext = next_extent(ext);
2609 osc_object_unlock(obj);
2611 osc_list_maint(cli, obj);
2613 while (!cfs_list_empty(&list)) {
2616 ext = cfs_list_entry(list.next, struct osc_extent, oe_link);
2617 cfs_list_del_init(&ext->oe_link);
2619 /* extent may be in OES_ACTIVE state because inode mutex
2620 * is released before osc_io_end() in file write case */
2621 if (ext->oe_state != OES_TRUNC)
2622 osc_extent_wait(env, ext, OES_TRUNC);
2624 rc = osc_extent_truncate(ext, index);
2629 OSC_EXTENT_DUMP(D_ERROR, ext,
2630 "truncate error %d\n", rc);
2631 } else if (ext->oe_nr_pages == 0) {
2632 osc_extent_remove(ext);
2634 /* this must be an overlapped extent which means only
2635 * part of pages in this extent have been truncated.
2637 EASSERTF(ext->oe_start < index, ext,
2638 "trunc index = %lu.\n", index);
2639 /* fix index to skip this partially truncated extent */
2640 index = ext->oe_end + 1;
2642 /* we need to hold this extent in OES_TRUNC state so
2643 * that no writeback will happen. This is to avoid
2645 LASSERT(oio->oi_trunc == NULL);
2646 oio->oi_trunc = osc_extent_get(ext);
2647 OSC_EXTENT_DUMP(D_CACHE, ext,
2648 "trunc at "LPU64"\n", size);
2650 osc_extent_put(env, ext);
2652 if (waiting != NULL) {
2654 result = osc_extent_wait(env, waiting, OES_INV);
2656 osc_extent_put(env, waiting);
2665 * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
2667 void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
2668 struct osc_object *obj)
2670 struct osc_extent *ext = oio->oi_trunc;
2672 oio->oi_trunc = NULL;
2674 EASSERT(ext->oe_nr_pages > 0, ext);
2675 EASSERT(ext->oe_state == OES_TRUNC, ext);
2676 EASSERT(!ext->oe_urgent, ext);
2678 OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
2679 osc_object_lock(obj);
2680 osc_extent_state_set(ext, OES_CACHE);
2681 osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
2682 osc_object_unlock(obj);
2683 osc_extent_put(env, ext);
2685 osc_list_maint(osc_cli(obj), obj);
2690 * Wait for extents in a specific range to be written out.
2691 * The caller must have called osc_cache_writeback_range() to issue IO
2692 * otherwise it will take a long time for this function to finish.
2694 * Caller must hold inode_mutex and i_alloc_sem, or cancel exclusive
2695 * dlm lock so that nobody else can dirty this range of file while we're
2696 * waiting for extents to be written.
2698 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
2699 pgoff_t start, pgoff_t end)
2701 struct osc_extent *ext;
2702 pgoff_t index = start;
2707 osc_object_lock(obj);
2708 ext = osc_extent_search(obj, index);
2710 ext = first_extent(obj);
2711 else if (ext->oe_end < index)
2712 ext = next_extent(ext);
2713 while (ext != NULL) {
2716 if (ext->oe_start > end)
2719 if (!ext->oe_fsync_wait) {
2720 ext = next_extent(ext);
2724 EASSERT(ergo(ext->oe_state == OES_CACHE,
2725 ext->oe_hp || ext->oe_urgent), ext);
2726 EASSERT(ergo(ext->oe_state == OES_ACTIVE,
2727 !ext->oe_hp && ext->oe_urgent), ext);
2729 index = ext->oe_end + 1;
2730 osc_extent_get(ext);
2731 osc_object_unlock(obj);
2733 rc = osc_extent_wait(env, ext, OES_INV);
2736 osc_extent_put(env, ext);
2739 osc_object_unlock(obj);
2741 OSC_IO_DEBUG(obj, "sync file range.\n");
2746 * Called to write out a range of osc object.
2748 * @hp : should be set this is caused by lock cancel;
2749 * @discard: is set if dirty pages should be dropped - file will be deleted or
2750 * truncated, this implies there is no partially discarding extents.
2752 * Return how many pages will be issued, or error code if error occurred.
2754 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
2755 pgoff_t start, pgoff_t end, int hp, int discard)
2757 struct osc_extent *ext;
2758 CFS_LIST_HEAD(discard_list);
2763 osc_object_lock(obj);
2764 ext = osc_extent_search(obj, start);
2766 ext = first_extent(obj);
2767 else if (ext->oe_end < start)
2768 ext = next_extent(ext);
2769 while (ext != NULL) {
2770 if (ext->oe_start > end)
2773 ext->oe_fsync_wait = 1;
2774 switch (ext->oe_state) {
2776 result += ext->oe_nr_pages;
2778 cfs_list_t *list = NULL;
2780 EASSERT(!ext->oe_hp, ext);
2782 list = &obj->oo_hp_exts;
2783 } else if (!ext->oe_urgent) {
2785 list = &obj->oo_urgent_exts;
2788 cfs_list_move_tail(&ext->oe_link, list);
2792 /* the only discarder is lock cancelling, so
2793 * [start, end] must contain this extent */
2794 EASSERT(ext->oe_start >= start &&
2795 ext->oe_max_end <= end, ext);
2796 osc_extent_state_set(ext, OES_LOCKING);
2797 ext->oe_owner = cfs_current();
2798 cfs_list_move_tail(&ext->oe_link,
2800 osc_update_pending(obj, OBD_BRW_WRITE,
2805 /* It's pretty bad to wait for ACTIVE extents, because
2806 * we don't know how long we will wait for it to be
2807 * flushed since it may be blocked at awaiting more
2808 * grants. We do this for the correctness of fsync. */
2809 LASSERT(hp == 0 && discard == 0);
2814 ext = next_extent(ext);
2816 osc_object_unlock(obj);
2818 LASSERT(ergo(!discard, cfs_list_empty(&discard_list)));
2819 if (!cfs_list_empty(&discard_list)) {
2820 struct osc_extent *tmp;
2823 osc_list_maint(osc_cli(obj), obj);
2824 cfs_list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
2825 cfs_list_del_init(&ext->oe_link);
2826 EASSERT(ext->oe_state == OES_LOCKING, ext);
2828 /* Discard caching pages. We don't actually write this
2829 * extent out but we complete it as if we did. */
2830 rc = osc_extent_make_ready(env, ext);
2831 if (unlikely(rc < 0)) {
2832 OSC_EXTENT_DUMP(D_ERROR, ext,
2833 "make_ready returned %d\n", rc);
2838 /* finish the extent as if the pages were sent */
2839 osc_extent_finish(env, ext, 0, 0);
2844 osc_io_unplug(env, osc_cli(obj), obj, PDL_POLICY_ROUND);
2846 if (hp || discard) {
2848 rc = osc_cache_wait_range(env, obj, start, end);
2849 if (result >= 0 && rc < 0)
2853 OSC_IO_DEBUG(obj, "cache page out.\n");