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);
848 static int extent_wait_cb(struct osc_extent *ext, int state)
852 osc_object_lock(ext->oe_obj);
853 ret = ext->oe_state == state;
854 osc_object_unlock(ext->oe_obj);
860 * Wait for the extent's state to become @state.
862 static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
865 struct osc_object *obj = ext->oe_obj;
866 struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL,
867 LWI_ON_SIGNAL_NOOP, NULL);
871 osc_object_lock(obj);
872 LASSERT(sanity_check_nolock(ext) == 0);
873 /* `Kick' this extent only if the caller is waiting for it to be
875 if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp) {
876 if (ext->oe_state == OES_ACTIVE) {
878 } else if (ext->oe_state == OES_CACHE) {
880 osc_extent_hold(ext);
884 osc_object_unlock(obj);
886 osc_extent_release(env, ext);
888 /* wait for the extent until its state becomes @state */
889 rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state), &lwi);
890 if (rc == -ETIMEDOUT) {
891 OSC_EXTENT_DUMP(D_ERROR, ext,
892 "%s: wait ext to %d timedout, recovery in progress?\n",
893 osc_export(obj)->exp_obd->obd_name, state);
895 lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
896 rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state),
899 if (rc == 0 && ext->oe_rc < 0)
905 * Discard pages with index greater than @size. If @ext is overlapped with
906 * @size, then partial truncate happens.
908 static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
911 struct cl_env_nest nest;
914 struct osc_object *obj = ext->oe_obj;
915 struct client_obd *cli = osc_cli(obj);
916 struct osc_async_page *oap;
917 struct osc_async_page *tmp;
918 int pages_in_chunk = 0;
919 int ppc_bits = cli->cl_chunkbits - CFS_PAGE_SHIFT;
920 __u64 trunc_chunk = trunc_index >> ppc_bits;
926 LASSERT(sanity_check(ext) == 0);
927 LASSERT(ext->oe_state == OES_TRUNC);
928 LASSERT(!ext->oe_urgent);
930 /* Request new lu_env.
931 * We can't use that env from osc_cache_truncate_start() because
932 * it's from lov_io_sub and not fully initialized. */
933 env = cl_env_nested_get(&nest);
934 io = &osc_env_info(env)->oti_io;
935 io->ci_obj = cl_object_top(osc2cl(obj));
936 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
940 /* discard all pages with index greater then trunc_index */
941 cfs_list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
943 struct cl_page *sub = oap2cl_page(oap);
944 struct cl_page *page = cl_page_top(sub);
946 LASSERT(cfs_list_empty(&oap->oap_rpc_item));
948 /* only discard the pages with their index greater than
949 * trunc_index, and ... */
950 if (sub->cp_index < trunc_index ||
951 (sub->cp_index == trunc_index && partial)) {
952 /* accounting how many pages remaining in the chunk
953 * so that we can calculate grants correctly. */
954 if (sub->cp_index >> ppc_bits == trunc_chunk)
959 cfs_list_del_init(&oap->oap_pending_item);
962 lu_ref_add(&page->cp_reference, "truncate", cfs_current());
964 if (cl_page_own(env, io, page) == 0) {
965 cl_page_unmap(env, io, page);
966 cl_page_discard(env, io, page);
967 cl_page_disown(env, io, page);
969 LASSERT(page->cp_state == CPS_FREEING);
973 lu_ref_del(&page->cp_reference, "truncate", cfs_current());
974 cl_page_put(env, page);
979 EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial,
980 ext->oe_nr_pages == 0),
981 ext, "trunc_index %lu, partial %d\n", trunc_index, partial);
983 osc_object_lock(obj);
984 if (ext->oe_nr_pages == 0) {
985 LASSERT(pages_in_chunk == 0);
986 grants = ext->oe_grants;
988 } else { /* calculate how many grants we can free */
989 int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
993 /* if there is no pages in this chunk, we can also free grants
994 * for the last chunk */
995 if (pages_in_chunk == 0) {
996 /* if this is the 1st chunk and no pages in this chunk,
997 * ext->oe_nr_pages must be zero, so we should be in
998 * the other if-clause. */
999 LASSERT(trunc_chunk > 0);
1004 /* this is what we can free from this extent */
1005 grants = chunks << cli->cl_chunkbits;
1006 ext->oe_grants -= grants;
1007 last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
1008 ext->oe_end = min(last_index, ext->oe_max_end);
1009 LASSERT(ext->oe_end >= ext->oe_start);
1010 LASSERT(ext->oe_grants > 0);
1012 osc_object_unlock(obj);
1014 if (grants > 0 || nr_pages > 0)
1015 osc_free_grant(cli, nr_pages, grants);
1018 cl_io_fini(env, io);
1019 cl_env_nested_put(&nest, env);
1024 * This function is used to make the extent prepared for transfer.
1025 * A race with flusing page - ll_writepage() has to be handled cautiously.
1027 static int osc_extent_make_ready(const struct lu_env *env,
1028 struct osc_extent *ext)
1030 struct osc_async_page *oap;
1031 struct osc_async_page *last = NULL;
1032 struct osc_object *obj = ext->oe_obj;
1037 /* we're going to grab page lock, so object lock must not be taken. */
1038 LASSERT(sanity_check(ext) == 0);
1039 /* in locking state, any process should not touch this extent. */
1040 EASSERT(ext->oe_state == OES_LOCKING, ext);
1041 EASSERT(ext->oe_owner != NULL, ext);
1043 OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
1045 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1047 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
1050 /* checking ASYNC_READY is race safe */
1051 if ((oap->oap_async_flags & ASYNC_READY) != 0)
1054 rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
1057 cfs_spin_lock(&oap->oap_lock);
1058 oap->oap_async_flags |= ASYNC_READY;
1059 cfs_spin_unlock(&oap->oap_lock);
1062 LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
1065 LASSERTF(0, "unknown return code: %d\n", rc);
1069 LASSERT(page_count == ext->oe_nr_pages);
1070 LASSERT(last != NULL);
1071 /* the last page is the only one we need to refresh its count by
1072 * the size of file. */
1073 if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
1074 last->oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
1075 LASSERT(last->oap_count > 0);
1076 LASSERT(last->oap_page_off + last->oap_count <= CFS_PAGE_SIZE);
1077 last->oap_async_flags |= ASYNC_COUNT_STABLE;
1080 /* for the rest of pages, we don't need to call osf_refresh_count()
1081 * because it's known they are not the last page */
1082 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1083 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
1084 oap->oap_count = CFS_PAGE_SIZE - oap->oap_page_off;
1085 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1089 osc_object_lock(obj);
1090 osc_extent_state_set(ext, OES_RPC);
1091 osc_object_unlock(obj);
1092 /* get a refcount for RPC. */
1093 osc_extent_get(ext);
1099 * Quick and simple version of osc_extent_find(). This function is frequently
1100 * called to expand the extent for the same IO. To expand the extent, the
1101 * page index must be in the same or next chunk of ext->oe_end.
1103 static int osc_extent_expand(struct osc_extent *ext, pgoff_t index, int *grants)
1105 struct osc_object *obj = ext->oe_obj;
1106 struct client_obd *cli = osc_cli(obj);
1107 struct osc_extent *next;
1108 int ppc_bits = cli->cl_chunkbits - CFS_PAGE_SHIFT;
1109 pgoff_t chunk = index >> ppc_bits;
1112 int chunksize = 1 << cli->cl_chunkbits;
1116 LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
1117 osc_object_lock(obj);
1118 LASSERT(sanity_check_nolock(ext) == 0);
1119 end_chunk = ext->oe_end >> ppc_bits;
1120 if (chunk > end_chunk + 1)
1121 GOTO(out, rc = -ERANGE);
1123 if (end_chunk >= chunk)
1126 LASSERT(end_chunk + 1 == chunk);
1127 /* try to expand this extent to cover @index */
1128 end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
1130 next = next_extent(ext);
1131 if (next != NULL && next->oe_start <= end_index)
1132 /* complex mode - overlapped with the next extent,
1133 * this case will be handled by osc_extent_find() */
1134 GOTO(out, rc = -EAGAIN);
1136 ext->oe_end = end_index;
1137 ext->oe_grants += chunksize;
1138 *grants -= chunksize;
1139 LASSERT(*grants >= 0);
1140 EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
1141 "overlapped after expanding for %lu.\n", index);
1145 osc_object_unlock(obj);
1149 static void osc_extent_tree_dump0(int level, struct osc_object *obj,
1150 const char *func, int line)
1152 struct osc_extent *ext;
1155 CDEBUG(level, "Dump object %p extents at %s:%d, mppr: %u.\n",
1156 obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
1158 /* osc_object_lock(obj); */
1160 for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
1161 OSC_EXTENT_DUMP(level, ext, "in tree %d.\n", cnt++);
1164 cfs_list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
1165 OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++);
1168 cfs_list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
1169 OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++);
1172 cfs_list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
1173 OSC_EXTENT_DUMP(level, ext, "reading %d.\n", cnt++);
1174 /* osc_object_unlock(obj); */
1177 /* ------------------ osc extent end ------------------ */
1179 static inline int osc_is_ready(struct osc_object *osc)
1181 return !cfs_list_empty(&osc->oo_ready_item) ||
1182 !cfs_list_empty(&osc->oo_hp_ready_item);
1185 #define OSC_IO_DEBUG(OSC, STR, args...) \
1186 CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
1187 (OSC), osc_is_ready(OSC), \
1188 list_empty_marker(&(OSC)->oo_hp_ready_item), \
1189 list_empty_marker(&(OSC)->oo_ready_item), \
1190 cfs_atomic_read(&(OSC)->oo_nr_writes), \
1191 list_empty_marker(&(OSC)->oo_hp_exts), \
1192 list_empty_marker(&(OSC)->oo_urgent_exts), \
1193 cfs_atomic_read(&(OSC)->oo_nr_reads), \
1194 list_empty_marker(&(OSC)->oo_reading_exts), \
1197 static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
1200 struct osc_page *opg = oap2osc_page(oap);
1201 struct cl_page *page = cl_page_top(oap2cl_page(oap));
1204 LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
1207 result = cl_page_make_ready(env, page, CRT_WRITE);
1209 opg->ops_submit_time = cfs_time_current();
1213 static int osc_refresh_count(const struct lu_env *env,
1214 struct osc_async_page *oap, int cmd)
1216 struct osc_page *opg = oap2osc_page(oap);
1217 struct cl_page *page = oap2cl_page(oap);
1218 struct cl_object *obj;
1219 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1224 /* readpage queues with _COUNT_STABLE, shouldn't get here. */
1225 LASSERT(!(cmd & OBD_BRW_READ));
1226 LASSERT(opg != NULL);
1227 obj = opg->ops_cl.cpl_obj;
1229 cl_object_attr_lock(obj);
1230 result = cl_object_attr_get(env, obj, attr);
1231 cl_object_attr_unlock(obj);
1234 kms = attr->cat_kms;
1235 if (cl_offset(obj, page->cp_index) >= kms)
1236 /* catch race with truncate */
1238 else if (cl_offset(obj, page->cp_index + 1) > kms)
1239 /* catch sub-page write at end of file */
1240 return kms % CFS_PAGE_SIZE;
1242 return CFS_PAGE_SIZE;
1245 static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
1248 struct osc_page *opg = oap2osc_page(oap);
1249 struct cl_page *page = cl_page_top(oap2cl_page(oap));
1250 struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
1251 enum cl_req_type crt;
1256 cmd &= ~OBD_BRW_NOQUOTA;
1257 LASSERT(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ));
1258 LASSERT(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE));
1259 LASSERT(opg->ops_transfer_pinned);
1262 * page->cp_req can be NULL if io submission failed before
1263 * cl_req was allocated.
1265 if (page->cp_req != NULL)
1266 cl_req_page_done(env, page);
1267 LASSERT(page->cp_req == NULL);
1269 crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
1270 /* Clear opg->ops_transfer_pinned before VM lock is released. */
1271 opg->ops_transfer_pinned = 0;
1273 cfs_spin_lock(&obj->oo_seatbelt);
1274 LASSERT(opg->ops_submitter != NULL);
1275 LASSERT(!cfs_list_empty(&opg->ops_inflight));
1276 cfs_list_del_init(&opg->ops_inflight);
1277 opg->ops_submitter = NULL;
1278 cfs_spin_unlock(&obj->oo_seatbelt);
1280 opg->ops_submit_time = 0;
1281 srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
1283 cl_page_completion(env, page, crt, rc);
1286 if (rc == 0 && srvlock) {
1287 struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
1288 struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
1289 int bytes = oap->oap_count;
1291 if (crt == CRT_READ)
1292 stats->os_lockless_reads += bytes;
1294 stats->os_lockless_writes += bytes;
1298 * This has to be the last operation with the page, as locks are
1299 * released in cl_page_completion() and nothing except for the
1300 * reference counter protects page from concurrent reclaim.
1302 lu_ref_del(&page->cp_reference, "transfer", page);
1304 * As page->cp_obj is pinned by a reference from page->cp_req, it is
1305 * safe to call cl_page_put() without risking object destruction in a
1306 * non-blocking context.
1308 cl_page_put(env, page);
1312 #define OSC_DUMP_GRANT(cli, fmt, args...) do { \
1313 struct client_obd *__tmp = (cli); \
1314 CDEBUG(D_CACHE, "%s: { dirty: %ld/%ld dirty_pages: %d/%d " \
1315 "dropped: %ld avail: %ld, reserved: %ld, flight: %d } " fmt, \
1316 __tmp->cl_import->imp_obd->obd_name, \
1317 __tmp->cl_dirty, __tmp->cl_dirty_max, \
1318 cfs_atomic_read(&obd_dirty_pages), obd_max_dirty_pages, \
1319 __tmp->cl_lost_grant, __tmp->cl_avail_grant, \
1320 __tmp->cl_reserved_grant, __tmp->cl_w_in_flight, ##args); \
1323 /* caller must hold loi_list_lock */
1324 static void osc_consume_write_grant(struct client_obd *cli,
1325 struct brw_page *pga)
1327 LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
1328 LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
1329 cfs_atomic_inc(&obd_dirty_pages);
1330 cli->cl_dirty += CFS_PAGE_SIZE;
1331 pga->flag |= OBD_BRW_FROM_GRANT;
1332 CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
1333 CFS_PAGE_SIZE, pga, pga->pg);
1334 osc_update_next_shrink(cli);
1337 /* the companion to osc_consume_write_grant, called when a brw has completed.
1338 * must be called with the loi lock held. */
1339 static void osc_release_write_grant(struct client_obd *cli,
1340 struct brw_page *pga)
1344 LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
1345 if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
1350 pga->flag &= ~OBD_BRW_FROM_GRANT;
1351 cfs_atomic_dec(&obd_dirty_pages);
1352 cli->cl_dirty -= CFS_PAGE_SIZE;
1353 if (pga->flag & OBD_BRW_NOCACHE) {
1354 pga->flag &= ~OBD_BRW_NOCACHE;
1355 cfs_atomic_dec(&obd_dirty_transit_pages);
1356 cli->cl_dirty_transit -= CFS_PAGE_SIZE;
1362 * To avoid sleeping with object lock held, it's good for us allocate enough
1363 * grants before entering into critical section.
1365 * client_obd_list_lock held by caller
1367 static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
1371 if (cli->cl_avail_grant >= bytes) {
1372 cli->cl_avail_grant -= bytes;
1373 cli->cl_reserved_grant += bytes;
1379 static void __osc_unreserve_grant(struct client_obd *cli,
1380 unsigned int reserved, unsigned int unused)
1382 /* it's quite normal for us to get more grant than reserved.
1383 * Thinking about a case that two extents merged by adding a new
1384 * chunk, we can save one extent tax. If extent tax is greater than
1385 * one chunk, we can save more grant by adding a new chunk */
1386 cli->cl_reserved_grant -= reserved;
1387 if (unused > reserved) {
1388 cli->cl_avail_grant += reserved;
1389 cli->cl_lost_grant += unused - reserved;
1391 cli->cl_avail_grant += unused;
1394 osc_wake_cache_waiters(cli);
1397 void osc_unreserve_grant(struct client_obd *cli,
1398 unsigned int reserved, unsigned int unused)
1400 client_obd_list_lock(&cli->cl_loi_list_lock);
1401 __osc_unreserve_grant(cli, reserved, unused);
1402 client_obd_list_unlock(&cli->cl_loi_list_lock);
1406 * Free grant after IO is finished or canceled.
1408 * @lost_grant is used to remember how many grants we have allocated but not
1409 * used, we should return these grants to OST. There're two cases where grants
1412 * 2. blocksize at OST is less than CFS_PAGE_SIZE and a partial page was
1413 * written. In this case OST may use less chunks to serve this partial
1414 * write. OSTs don't actually know the page size on the client side. so
1415 * clients have to calculate lost grant by the blocksize on the OST.
1416 * See filter_grant_check() for details.
1418 static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
1419 unsigned int lost_grant)
1421 int grant = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
1423 client_obd_list_lock(&cli->cl_loi_list_lock);
1424 cfs_atomic_sub(nr_pages, &obd_dirty_pages);
1425 cli->cl_dirty -= nr_pages << CFS_PAGE_SHIFT;
1426 cli->cl_lost_grant += lost_grant;
1427 if (cli->cl_avail_grant < grant && cli->cl_lost_grant >= grant) {
1428 /* borrow some grant from truncate to avoid the case that
1429 * truncate uses up all avail grant */
1430 cli->cl_lost_grant -= grant;
1431 cli->cl_avail_grant += grant;
1433 osc_wake_cache_waiters(cli);
1434 client_obd_list_unlock(&cli->cl_loi_list_lock);
1435 CDEBUG(D_CACHE, "lost %u grant: %lu avail: %lu dirty: %lu\n",
1436 lost_grant, cli->cl_lost_grant,
1437 cli->cl_avail_grant, cli->cl_dirty);
1440 /* The companion to osc_enter_cache(), called when @oap is no longer part of
1441 * the dirty accounting. Writeback completes or truncate happens before
1442 * writing starts. Must be called with the loi lock held. */
1443 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
1445 osc_release_write_grant(cli, &oap->oap_brw_page);
1449 * Non-blocking version of osc_enter_cache() that consumes grant only when it
1452 static int osc_enter_cache_try(struct client_obd *cli,
1453 struct osc_async_page *oap,
1454 int bytes, int transient)
1458 OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
1460 rc = osc_reserve_grant(cli, bytes);
1464 if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
1465 cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages) {
1466 osc_consume_write_grant(cli, &oap->oap_brw_page);
1468 cli->cl_dirty_transit += CFS_PAGE_SIZE;
1469 cfs_atomic_inc(&obd_dirty_transit_pages);
1470 oap->oap_brw_flags |= OBD_BRW_NOCACHE;
1474 __osc_unreserve_grant(cli, bytes, bytes);
1480 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
1481 * grant or cache space. */
1482 static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
1483 struct osc_async_page *oap, int bytes)
1485 struct osc_object *osc = oap->oap_obj;
1486 struct lov_oinfo *loi = osc->oo_oinfo;
1487 struct osc_cache_waiter ocw;
1488 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1492 OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
1494 client_obd_list_lock(&cli->cl_loi_list_lock);
1496 /* force the caller to try sync io. this can jump the list
1497 * of queued writes and create a discontiguous rpc stream */
1498 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
1499 cli->cl_dirty_max < CFS_PAGE_SIZE ||
1500 cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync)
1501 GOTO(out, rc = -EDQUOT);
1503 /* Hopefully normal case - cache space and write credits available */
1504 if (osc_enter_cache_try(cli, oap, bytes, 0))
1507 /* We can get here for two reasons: too many dirty pages in cache, or
1508 * run out of grants. In both cases we should write dirty pages out.
1509 * Adding a cache waiter will trigger urgent write-out no matter what
1511 * The exiting condition is no avail grants and no dirty pages caching,
1512 * that really means there is no space on the OST. */
1513 cfs_waitq_init(&ocw.ocw_waitq);
1515 ocw.ocw_grant = bytes;
1516 while (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) {
1517 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
1519 client_obd_list_unlock(&cli->cl_loi_list_lock);
1521 osc_io_unplug(env, cli, osc, PDL_POLICY_ROUND);
1523 CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
1524 cli->cl_import->imp_obd->obd_name, &ocw, oap);
1526 rc = l_wait_event(ocw.ocw_waitq,
1527 cfs_list_empty(&ocw.ocw_entry), &lwi);
1529 client_obd_list_lock(&cli->cl_loi_list_lock);
1530 cfs_list_del_init(&ocw.ocw_entry);
1537 if (osc_enter_cache_try(cli, oap, bytes, 0)) {
1545 client_obd_list_unlock(&cli->cl_loi_list_lock);
1546 OSC_DUMP_GRANT(cli, "returned %d.\n", rc);
1550 /* caller must hold loi_list_lock */
1551 void osc_wake_cache_waiters(struct client_obd *cli)
1553 cfs_list_t *l, *tmp;
1554 struct osc_cache_waiter *ocw;
1557 cfs_list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
1558 /* if we can't dirty more, we must wait until some is written */
1559 if ((cli->cl_dirty + CFS_PAGE_SIZE > cli->cl_dirty_max) ||
1560 (cfs_atomic_read(&obd_dirty_pages) + 1 >
1561 obd_max_dirty_pages)) {
1562 CDEBUG(D_CACHE, "no dirty room: dirty: %ld "
1563 "osc max %ld, sys max %d\n", cli->cl_dirty,
1564 cli->cl_dirty_max, obd_max_dirty_pages);
1568 /* if still dirty cache but no grant wait for pending RPCs that
1569 * may yet return us some grant before doing sync writes */
1570 if (cli->cl_w_in_flight && cli->cl_avail_grant < CFS_PAGE_SIZE) {
1571 CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n",
1572 cli->cl_w_in_flight);
1576 ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry);
1577 cfs_list_del_init(&ocw->ocw_entry);
1580 if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0))
1581 ocw->ocw_rc = -EDQUOT;
1583 CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld, %d\n",
1584 ocw, ocw->ocw_oap, cli->cl_avail_grant, ocw->ocw_rc);
1586 cfs_waitq_signal(&ocw->ocw_waitq);
1592 static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
1594 int hprpc = !!cfs_list_empty(&osc->oo_hp_exts);
1595 return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
1598 /* This maintains the lists of pending pages to read/write for a given object
1599 * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
1600 * to quickly find objects that are ready to send an RPC. */
1601 static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
1604 int invalid_import = 0;
1607 /* if we have an invalid import we want to drain the queued pages
1608 * by forcing them through rpcs that immediately fail and complete
1609 * the pages. recovery relies on this to empty the queued pages
1610 * before canceling the locks and evicting down the llite pages */
1611 if ((cli->cl_import == NULL || cli->cl_import->imp_invalid))
1614 if (cmd & OBD_BRW_WRITE) {
1615 if (cfs_atomic_read(&osc->oo_nr_writes) == 0)
1617 if (invalid_import) {
1618 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1621 if (!cfs_list_empty(&osc->oo_hp_exts)) {
1622 CDEBUG(D_CACHE, "high prio request forcing RPC\n");
1625 if (!cfs_list_empty(&osc->oo_urgent_exts)) {
1626 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1629 /* trigger a write rpc stream as long as there are dirtiers
1630 * waiting for space. as they're waiting, they're not going to
1631 * create more pages to coalesce with what's waiting.. */
1632 if (!cfs_list_empty(&cli->cl_cache_waiters)) {
1633 CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1636 if (cfs_atomic_read(&osc->oo_nr_writes) >=
1637 cli->cl_max_pages_per_rpc)
1640 if (cfs_atomic_read(&osc->oo_nr_reads) == 0)
1642 if (invalid_import) {
1643 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1646 /* all read are urgent. */
1647 if (!cfs_list_empty(&osc->oo_reading_exts))
1654 static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
1656 struct client_obd *cli = osc_cli(obj);
1657 if (cmd & OBD_BRW_WRITE) {
1658 cfs_atomic_add(delta, &obj->oo_nr_writes);
1659 cfs_atomic_add(delta, &cli->cl_pending_w_pages);
1660 LASSERT(cfs_atomic_read(&obj->oo_nr_writes) >= 0);
1662 cfs_atomic_add(delta, &obj->oo_nr_reads);
1663 cfs_atomic_add(delta, &cli->cl_pending_r_pages);
1664 LASSERT(cfs_atomic_read(&obj->oo_nr_reads) >= 0);
1666 OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
1669 static int osc_makes_hprpc(struct osc_object *obj)
1671 return !cfs_list_empty(&obj->oo_hp_exts);
1674 static void on_list(cfs_list_t *item, cfs_list_t *list, int should_be_on)
1676 if (cfs_list_empty(item) && should_be_on)
1677 cfs_list_add_tail(item, list);
1678 else if (!cfs_list_empty(item) && !should_be_on)
1679 cfs_list_del_init(item);
1682 /* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
1683 * can find pages to build into rpcs quickly */
1684 static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1686 if (osc_makes_hprpc(osc)) {
1688 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
1689 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
1691 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
1692 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
1693 osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
1694 osc_makes_rpc(cli, osc, OBD_BRW_READ));
1697 on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
1698 cfs_atomic_read(&osc->oo_nr_writes) > 0);
1700 on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
1701 cfs_atomic_read(&osc->oo_nr_reads) > 0);
1703 return osc_is_ready(osc);
1706 static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1710 client_obd_list_lock(&cli->cl_loi_list_lock);
1711 is_ready = __osc_list_maint(cli, osc);
1712 client_obd_list_unlock(&cli->cl_loi_list_lock);
1717 /* this is trying to propogate async writeback errors back up to the
1718 * application. As an async write fails we record the error code for later if
1719 * the app does an fsync. As long as errors persist we force future rpcs to be
1720 * sync so that the app can get a sync error and break the cycle of queueing
1721 * pages for which writeback will fail. */
1722 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
1729 ar->ar_force_sync = 1;
1730 ar->ar_min_xid = ptlrpc_sample_next_xid();
1735 if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
1736 ar->ar_force_sync = 0;
1739 /* this must be called holding the loi list lock to give coverage to exit_cache,
1740 * async_flag maintenance, and oap_request */
1741 static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
1742 struct osc_async_page *oap, int sent, int rc)
1744 struct osc_object *osc = oap->oap_obj;
1745 struct lov_oinfo *loi = osc->oo_oinfo;
1749 if (oap->oap_request != NULL) {
1750 xid = ptlrpc_req_xid(oap->oap_request);
1751 ptlrpc_req_finished(oap->oap_request);
1752 oap->oap_request = NULL;
1755 /* As the transfer for this page is being done, clear the flags */
1756 cfs_spin_lock(&oap->oap_lock);
1757 oap->oap_async_flags = 0;
1758 cfs_spin_unlock(&oap->oap_lock);
1759 oap->oap_interrupted = 0;
1761 if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
1762 client_obd_list_lock(&cli->cl_loi_list_lock);
1763 osc_process_ar(&cli->cl_ar, xid, rc);
1764 osc_process_ar(&loi->loi_ar, xid, rc);
1765 client_obd_list_unlock(&cli->cl_loi_list_lock);
1768 rc = osc_completion(env, oap, oap->oap_cmd, rc);
1770 CERROR("completion on oap %p obj %p returns %d.\n",
1777 * Try to add extent to one RPC. We need to think about the following things:
1778 * - # of pages must not be over max_pages_per_rpc
1779 * - extent must be compatible with previous ones
1781 static int try_to_add_extent_for_io(struct client_obd *cli,
1782 struct osc_extent *ext, cfs_list_t *rpclist,
1783 int *pc, unsigned int *max_pages)
1785 struct osc_extent *tmp;
1788 EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
1791 *max_pages = max(ext->oe_mppr, *max_pages);
1792 if (*pc + ext->oe_nr_pages > *max_pages)
1795 cfs_list_for_each_entry(tmp, rpclist, oe_link) {
1796 EASSERT(tmp->oe_owner == cfs_current(), tmp);
1798 if (overlapped(tmp, ext)) {
1799 OSC_EXTENT_DUMP(D_ERROR, tmp, "overlapped %p.\n", ext);
1804 if (tmp->oe_srvlock != ext->oe_srvlock ||
1805 !tmp->oe_grants != !ext->oe_grants)
1808 /* remove break for strict check */
1812 *pc += ext->oe_nr_pages;
1813 cfs_list_move_tail(&ext->oe_link, rpclist);
1814 ext->oe_owner = cfs_current();
1819 * In order to prevent multiple ptlrpcd from breaking contiguous extents,
1820 * get_write_extent() takes all appropriate extents in atomic.
1822 * The following policy is used to collect extents for IO:
1823 * 1. Add as many HP extents as possible;
1824 * 2. Add the first urgent extent in urgent extent list and take it out of
1826 * 3. Add subsequent extents of this urgent extent;
1827 * 4. If urgent list is not empty, goto 2;
1828 * 5. Traverse the extent tree from the 1st extent;
1829 * 6. Above steps exit if there is no space in this RPC.
1831 static int get_write_extents(struct osc_object *obj, cfs_list_t *rpclist)
1833 struct client_obd *cli = osc_cli(obj);
1834 struct osc_extent *ext;
1836 unsigned int max_pages = cli->cl_max_pages_per_rpc;
1838 LASSERT(osc_object_is_locked(obj));
1839 while (!cfs_list_empty(&obj->oo_hp_exts)) {
1840 ext = cfs_list_entry(obj->oo_hp_exts.next, struct osc_extent,
1842 LASSERT(ext->oe_state == OES_CACHE);
1843 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1846 EASSERT(ext->oe_nr_pages <= max_pages, ext);
1848 if (page_count == max_pages)
1851 while (!cfs_list_empty(&obj->oo_urgent_exts)) {
1852 ext = cfs_list_entry(obj->oo_urgent_exts.next,
1853 struct osc_extent, oe_link);
1854 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1858 if (!ext->oe_intree)
1861 while ((ext = next_extent(ext)) != NULL) {
1862 if ((ext->oe_state != OES_CACHE) ||
1863 (!cfs_list_empty(&ext->oe_link) &&
1864 ext->oe_owner != NULL))
1867 if (!try_to_add_extent_for_io(cli, ext, rpclist,
1868 &page_count, &max_pages))
1872 if (page_count == max_pages)
1875 ext = first_extent(obj);
1876 while (ext != NULL) {
1877 if ((ext->oe_state != OES_CACHE) ||
1878 /* this extent may be already in current rpclist */
1879 (!cfs_list_empty(&ext->oe_link) && ext->oe_owner != NULL)) {
1880 ext = next_extent(ext);
1884 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1888 ext = next_extent(ext);
1894 osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
1895 struct osc_object *osc, pdl_policy_t pol)
1897 CFS_LIST_HEAD(rpclist);
1898 struct osc_extent *ext;
1899 struct osc_extent *tmp;
1900 struct osc_extent *first = NULL;
1901 obd_count page_count = 0;
1906 LASSERT(osc_object_is_locked(osc));
1908 page_count = get_write_extents(osc, &rpclist);
1909 LASSERT(equi(page_count == 0, cfs_list_empty(&rpclist)));
1911 if (cfs_list_empty(&rpclist))
1914 osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
1916 cfs_list_for_each_entry(ext, &rpclist, oe_link) {
1917 LASSERT(ext->oe_state == OES_CACHE ||
1918 ext->oe_state == OES_LOCK_DONE);
1919 if (ext->oe_state == OES_CACHE)
1920 osc_extent_state_set(ext, OES_LOCKING);
1922 osc_extent_state_set(ext, OES_RPC);
1925 /* we're going to grab page lock, so release object lock because
1926 * lock order is page lock -> object lock. */
1927 osc_object_unlock(osc);
1929 cfs_list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
1930 if (ext->oe_state == OES_LOCKING) {
1931 rc = osc_extent_make_ready(env, ext);
1932 if (unlikely(rc < 0)) {
1933 cfs_list_del_init(&ext->oe_link);
1934 osc_extent_finish(env, ext, 0, rc);
1938 if (first == NULL) {
1940 srvlock = ext->oe_srvlock;
1942 LASSERT(srvlock == ext->oe_srvlock);
1946 if (!cfs_list_empty(&rpclist)) {
1947 LASSERT(page_count > 0);
1948 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE, pol);
1949 LASSERT(cfs_list_empty(&rpclist));
1952 osc_object_lock(osc);
1957 * prepare pages for ASYNC io and put pages in send queue.
1959 * \param cmd OBD_BRW_* macroses
1960 * \param lop pending pages
1962 * \return zero if no page added to send queue.
1963 * \return 1 if pages successfully added to send queue.
1964 * \return negative on errors.
1967 osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
1968 struct osc_object *osc, pdl_policy_t pol)
1970 struct osc_extent *ext;
1971 struct osc_extent *next;
1972 CFS_LIST_HEAD(rpclist);
1974 unsigned int max_pages = cli->cl_max_pages_per_rpc;
1978 LASSERT(osc_object_is_locked(osc));
1979 cfs_list_for_each_entry_safe(ext, next,
1980 &osc->oo_reading_exts, oe_link) {
1981 EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
1982 if (!try_to_add_extent_for_io(cli, ext, &rpclist, &page_count,
1985 osc_extent_state_set(ext, OES_RPC);
1986 EASSERT(ext->oe_nr_pages <= max_pages, ext);
1988 LASSERT(page_count <= max_pages);
1990 osc_update_pending(osc, OBD_BRW_READ, -page_count);
1992 if (!cfs_list_empty(&rpclist)) {
1993 osc_object_unlock(osc);
1995 LASSERT(page_count > 0);
1996 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ, pol);
1997 LASSERT(cfs_list_empty(&rpclist));
1999 osc_object_lock(osc);
2004 #define list_to_obj(list, item) ({ \
2005 cfs_list_t *__tmp = (list)->next; \
2006 cfs_list_del_init(__tmp); \
2007 cfs_list_entry(__tmp, struct osc_object, oo_##item); \
2010 /* This is called by osc_check_rpcs() to find which objects have pages that
2011 * we could be sending. These lists are maintained by osc_makes_rpc(). */
2012 static struct osc_object *osc_next_obj(struct client_obd *cli)
2016 /* First return objects that have blocked locks so that they
2017 * will be flushed quickly and other clients can get the lock,
2018 * then objects which have pages ready to be stuffed into RPCs */
2019 if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
2020 RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
2021 if (!cfs_list_empty(&cli->cl_loi_ready_list))
2022 RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
2024 /* then if we have cache waiters, return all objects with queued
2025 * writes. This is especially important when many small files
2026 * have filled up the cache and not been fired into rpcs because
2027 * they don't pass the nr_pending/object threshhold */
2028 if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2029 !cfs_list_empty(&cli->cl_loi_write_list))
2030 RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
2032 /* then return all queued objects when we have an invalid import
2033 * so that they get flushed */
2034 if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2035 if (!cfs_list_empty(&cli->cl_loi_write_list))
2036 RETURN(list_to_obj(&cli->cl_loi_write_list,
2038 if (!cfs_list_empty(&cli->cl_loi_read_list))
2039 RETURN(list_to_obj(&cli->cl_loi_read_list,
2045 /* called with the loi list lock held */
2046 static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli,
2049 struct osc_object *osc;
2053 while ((osc = osc_next_obj(cli)) != NULL) {
2054 struct cl_object *obj = osc2cl(osc);
2055 struct lu_ref_link *link;
2057 OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
2059 if (osc_max_rpc_in_flight(cli, osc)) {
2060 __osc_list_maint(cli, osc);
2065 client_obd_list_unlock(&cli->cl_loi_list_lock);
2066 link = lu_object_ref_add(&obj->co_lu, "check", cfs_current());
2068 /* attempt some read/write balancing by alternating between
2069 * reads and writes in an object. The makes_rpc checks here
2070 * would be redundant if we were getting read/write work items
2071 * instead of objects. we don't want send_oap_rpc to drain a
2072 * partial read pending queue when we're given this object to
2073 * do io on writes while there are cache waiters */
2074 osc_object_lock(osc);
2075 if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
2076 rc = osc_send_write_rpc(env, cli, osc, pol);
2078 CERROR("Write request failed with %d\n", rc);
2080 /* osc_send_write_rpc failed, mostly because of
2083 * It can't break here, because if:
2084 * - a page was submitted by osc_io_submit, so
2086 * - no request in flight
2087 * - no subsequent request
2088 * The system will be in live-lock state,
2089 * because there is no chance to call
2090 * osc_io_unplug() and osc_check_rpcs() any
2091 * more. pdflush can't help in this case,
2092 * because it might be blocked at grabbing
2093 * the page lock as we mentioned.
2095 * Anyway, continue to drain pages. */
2099 if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
2100 rc = osc_send_read_rpc(env, cli, osc, pol);
2102 CERROR("Read request failed with %d\n", rc);
2104 osc_object_unlock(osc);
2106 osc_list_maint(cli, osc);
2107 lu_object_ref_del_at(&obj->co_lu, link, "check", cfs_current());
2108 cl_object_put(env, obj);
2110 client_obd_list_lock(&cli->cl_loi_list_lock);
2114 static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
2115 struct osc_object *osc, pdl_policy_t pol, int async)
2120 client_obd_list_lock(&cli->cl_loi_list_lock);
2122 has_rpcs = __osc_list_maint(cli, osc);
2125 osc_check_rpcs(env, cli, pol);
2127 CDEBUG(D_CACHE, "Queue writeback work for client %p.\n",
2129 LASSERT(cli->cl_writeback_work != NULL);
2130 rc = ptlrpcd_queue_work(cli->cl_writeback_work);
2133 client_obd_list_unlock(&cli->cl_loi_list_lock);
2137 static int osc_io_unplug_async(const struct lu_env *env,
2138 struct client_obd *cli, struct osc_object *osc)
2140 /* XXX: policy is no use actually. */
2141 return osc_io_unplug0(env, cli, osc, PDL_POLICY_ROUND, 1);
2144 void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
2145 struct osc_object *osc, pdl_policy_t pol)
2147 (void)osc_io_unplug0(env, cli, osc, pol, 0);
2150 int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
2151 cfs_page_t *page, loff_t offset)
2153 struct obd_export *exp = osc_export(osc);
2154 struct osc_async_page *oap = &ops->ops_oap;
2158 return cfs_size_round(sizeof(*oap));
2160 oap->oap_magic = OAP_MAGIC;
2161 oap->oap_cli = &exp->exp_obd->u.cli;
2164 oap->oap_page = page;
2165 oap->oap_obj_off = offset;
2166 LASSERT(!(offset & ~CFS_PAGE_MASK));
2168 if (!client_is_remote(exp) && cfs_capable(CFS_CAP_SYS_RESOURCE))
2169 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2171 CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2172 CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2174 cfs_spin_lock_init(&oap->oap_lock);
2175 CDEBUG(D_INFO, "oap %p page %p obj off "LPU64"\n",
2176 oap, page, oap->oap_obj_off);
2180 int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
2181 struct osc_page *ops)
2183 struct osc_io *oio = osc_env_io(env);
2184 struct osc_extent *ext = NULL;
2185 struct osc_async_page *oap = &ops->ops_oap;
2186 struct client_obd *cli = oap->oap_cli;
2187 struct osc_object *osc = oap->oap_obj;
2190 int brw_flags = OBD_BRW_ASYNC;
2191 int cmd = OBD_BRW_WRITE;
2192 int need_release = 0;
2196 if (oap->oap_magic != OAP_MAGIC)
2199 if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2202 if (!cfs_list_empty(&oap->oap_pending_item) ||
2203 !cfs_list_empty(&oap->oap_rpc_item))
2206 /* Set the OBD_BRW_SRVLOCK before the page is queued. */
2207 brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
2208 if (!client_is_remote(osc_export(osc)) &&
2209 cfs_capable(CFS_CAP_SYS_RESOURCE)) {
2210 brw_flags |= OBD_BRW_NOQUOTA;
2211 cmd |= OBD_BRW_NOQUOTA;
2214 /* check if the file's owner/group is over quota */
2215 if (!(cmd & OBD_BRW_NOQUOTA)) {
2216 struct cl_object *obj;
2217 struct cl_attr *attr;
2218 unsigned int qid[MAXQUOTAS];
2220 obj = cl_object_top(&osc->oo_cl);
2221 attr = &osc_env_info(env)->oti_attr;
2223 cl_object_attr_lock(obj);
2224 rc = cl_object_attr_get(env, obj, attr);
2225 cl_object_attr_unlock(obj);
2227 qid[USRQUOTA] = attr->cat_uid;
2228 qid[GRPQUOTA] = attr->cat_gid;
2229 if (rc == 0 && osc_quota_chkdq(cli, qid) == NO_QUOTA)
2236 oap->oap_page_off = ops->ops_from;
2237 oap->oap_count = ops->ops_to - ops->ops_from;
2238 oap->oap_async_flags = 0;
2239 oap->oap_brw_flags = brw_flags;
2241 OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
2242 oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
2244 index = oap2cl_page(oap)->cp_index;
2246 /* Add this page into extent by the following steps:
2247 * 1. if there exists an active extent for this IO, mostly this page
2248 * can be added to the active extent and sometimes we need to
2249 * expand extent to accomodate this page;
2250 * 2. otherwise, a new extent will be allocated. */
2252 ext = oio->oi_active;
2253 if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) {
2254 /* one chunk plus extent overhead must be enough to write this
2256 grants = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
2257 if (ext->oe_end >= index)
2260 /* it doesn't need any grant to dirty this page */
2261 client_obd_list_lock(&cli->cl_loi_list_lock);
2262 rc = osc_enter_cache_try(cli, oap, grants, 0);
2263 client_obd_list_unlock(&cli->cl_loi_list_lock);
2264 if (rc == 0) { /* try failed */
2267 } else if (ext->oe_end < index) {
2269 /* try to expand this extent */
2270 rc = osc_extent_expand(ext, index, &tmp);
2273 /* don't free reserved grant */
2275 OSC_EXTENT_DUMP(D_CACHE, ext,
2276 "expanded for %lu.\n", index);
2277 osc_unreserve_grant(cli, grants, tmp);
2282 } else if (ext != NULL) {
2283 /* index is located outside of active extent */
2287 osc_extent_release(env, ext);
2288 oio->oi_active = NULL;
2293 int tmp = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
2295 /* try to find new extent to cover this page */
2296 LASSERT(oio->oi_active == NULL);
2297 /* we may have allocated grant for this page if we failed
2298 * to expand the previous active extent. */
2299 LASSERT(ergo(grants > 0, grants >= tmp));
2303 /* we haven't allocated grant for this page. */
2304 rc = osc_enter_cache(env, cli, oap, tmp);
2311 ext = osc_extent_find(env, osc, index, &tmp);
2313 LASSERT(tmp == grants);
2314 osc_exit_cache(cli, oap);
2318 oio->oi_active = ext;
2322 osc_unreserve_grant(cli, grants, tmp);
2325 LASSERT(ergo(rc == 0, ext != NULL));
2327 EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
2328 ext, "index = %lu.\n", index);
2329 LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
2331 osc_object_lock(osc);
2332 if (ext->oe_nr_pages == 0)
2333 ext->oe_srvlock = ops->ops_srvlock;
2335 LASSERT(ext->oe_srvlock == ops->ops_srvlock);
2337 cfs_list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
2338 osc_object_unlock(osc);
2343 int osc_teardown_async_page(const struct lu_env *env,
2344 struct osc_object *obj, struct osc_page *ops)
2346 struct osc_async_page *oap = &ops->ops_oap;
2347 struct osc_extent *ext = NULL;
2351 LASSERT(oap->oap_magic == OAP_MAGIC);
2353 CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
2354 oap, ops, oap2cl_page(oap)->cp_index);
2356 osc_object_lock(obj);
2357 if (!cfs_list_empty(&oap->oap_rpc_item)) {
2358 CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
2360 } else if (!cfs_list_empty(&oap->oap_pending_item)) {
2361 ext = osc_extent_lookup(obj, oap2cl_page(oap)->cp_index);
2362 /* only truncated pages are allowed to be taken out.
2363 * See osc_extent_truncate() and osc_cache_truncate_start()
2365 if (ext != NULL && ext->oe_state != OES_TRUNC) {
2366 OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
2367 oap2cl_page(oap)->cp_index);
2371 osc_object_unlock(obj);
2373 osc_extent_put(env, ext);
2378 * This is called when a page is picked up by kernel to write out.
2380 * We should find out the corresponding extent and add the whole extent
2381 * into urgent list. The extent may be being truncated or used, handle it
2384 int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
2385 struct osc_page *ops)
2387 struct osc_extent *ext = NULL;
2388 struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
2389 struct cl_page *cp = ops->ops_cl.cpl_page;
2390 pgoff_t index = cp->cp_index;
2391 struct osc_async_page *oap = &ops->ops_oap;
2396 osc_object_lock(obj);
2397 ext = osc_extent_lookup(obj, index);
2399 osc_extent_tree_dump(D_ERROR, obj);
2400 LASSERTF(0, "page index %lu is NOT covered.\n", index);
2403 switch (ext->oe_state) {
2406 CL_PAGE_DEBUG(D_ERROR, env, cl_page_top(cp),
2407 "flush an in-rpc page?\n");
2411 /* If we know this extent is being written out, we should abort
2412 * so that the writer can make this page ready. Otherwise, there
2413 * exists a deadlock problem because other process can wait for
2414 * page writeback bit holding page lock; and meanwhile in
2415 * vvp_page_make_ready(), we need to grab page lock before
2416 * really sending the RPC. */
2418 /* race with truncate, page will be redirtied */
2419 GOTO(out, rc = -EAGAIN);
2424 rc = cl_page_prep(env, io, cl_page_top(cp), CRT_WRITE);
2428 cfs_spin_lock(&oap->oap_lock);
2429 oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
2430 cfs_spin_unlock(&oap->oap_lock);
2432 if (cfs_memory_pressure_get())
2433 ext->oe_memalloc = 1;
2436 if (ext->oe_state == OES_CACHE && cfs_list_empty(&ext->oe_link)) {
2437 OSC_EXTENT_DUMP(D_CACHE, ext,
2438 "flush page %p make it urgent.\n", oap);
2439 cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2446 osc_object_unlock(obj);
2447 osc_extent_put(env, ext);
2449 osc_io_unplug_async(env, osc_cli(obj), obj);
2454 * this is called when a sync waiter receives an interruption. Its job is to
2455 * get the caller woken as soon as possible. If its page hasn't been put in an
2456 * rpc yet it can dequeue immediately. Otherwise it has to mark the rpc as
2457 * desiring interruption which will forcefully complete the rpc once the rpc
2460 int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops)
2462 struct osc_async_page *oap = &ops->ops_oap;
2463 struct osc_object *obj = oap->oap_obj;
2464 struct client_obd *cli = osc_cli(obj);
2465 struct osc_extent *ext;
2466 struct osc_extent *found = NULL;
2468 pgoff_t index = oap2cl_page(oap)->cp_index;
2473 LASSERT(!oap->oap_interrupted);
2474 oap->oap_interrupted = 1;
2476 /* Find out the caching extent */
2477 osc_object_lock(obj);
2478 if (oap->oap_cmd & OBD_BRW_WRITE) {
2479 plist = &obj->oo_urgent_exts;
2480 cmd = OBD_BRW_WRITE;
2482 plist = &obj->oo_reading_exts;
2485 cfs_list_for_each_entry(ext, plist, oe_link) {
2486 if (ext->oe_start <= index && ext->oe_end >= index) {
2487 LASSERT(ext->oe_state == OES_LOCK_DONE);
2488 /* For OES_LOCK_DONE state extent, it has already held
2489 * a refcount for RPC. */
2490 found = osc_extent_get(ext);
2494 if (found != NULL) {
2495 cfs_list_del_init(&found->oe_link);
2496 osc_update_pending(obj, cmd, -found->oe_nr_pages);
2497 osc_object_unlock(obj);
2499 osc_extent_finish(env, found, 0, -EINTR);
2500 osc_extent_put(env, found);
2503 osc_object_unlock(obj);
2504 /* ok, it's been put in an rpc. only one oap gets a request
2506 if (oap->oap_request != NULL) {
2507 ptlrpc_mark_interrupted(oap->oap_request);
2508 ptlrpcd_wake(oap->oap_request);
2509 ptlrpc_req_finished(oap->oap_request);
2510 oap->oap_request = NULL;
2514 osc_list_maint(cli, obj);
2518 int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
2519 cfs_list_t *list, int cmd, int brw_flags)
2521 struct client_obd *cli = osc_cli(obj);
2522 struct osc_extent *ext;
2523 struct osc_async_page *oap;
2525 int mppr = cli->cl_max_pages_per_rpc;
2526 pgoff_t start = CL_PAGE_EOF;
2530 cfs_list_for_each_entry(oap, list, oap_pending_item) {
2531 struct cl_page *cp = oap2cl_page(oap);
2532 if (cp->cp_index > end)
2534 if (cp->cp_index < start)
2535 start = cp->cp_index;
2537 mppr <<= (page_count > mppr);
2540 ext = osc_extent_alloc(obj);
2542 cfs_list_for_each_entry(oap, list, oap_pending_item) {
2543 cfs_list_del_init(&oap->oap_pending_item);
2544 osc_ap_completion(env, cli, oap, 0, -ENOMEM);
2549 ext->oe_rw = !!(cmd & OBD_BRW_READ);
2551 ext->oe_start = start;
2552 ext->oe_end = ext->oe_max_end = end;
2554 ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
2555 ext->oe_nr_pages = page_count;
2556 ext->oe_mppr = mppr;
2557 cfs_list_splice_init(list, &ext->oe_pages);
2559 osc_object_lock(obj);
2560 /* Reuse the initial refcount for RPC, don't drop it */
2561 osc_extent_state_set(ext, OES_LOCK_DONE);
2562 if (cmd & OBD_BRW_WRITE) {
2563 cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2564 osc_update_pending(obj, OBD_BRW_WRITE, page_count);
2566 cfs_list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
2567 osc_update_pending(obj, OBD_BRW_READ, page_count);
2569 osc_object_unlock(obj);
2571 osc_io_unplug(env, cli, obj, PDL_POLICY_ROUND);
2576 * Called by osc_io_setattr_start() to freeze and destroy covering extents.
2578 int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
2579 struct osc_object *obj, __u64 size)
2581 struct client_obd *cli = osc_cli(obj);
2582 struct osc_extent *ext;
2583 struct osc_extent *waiting = NULL;
2585 CFS_LIST_HEAD(list);
2590 /* pages with index greater or equal to index will be truncated. */
2591 index = cl_index(osc2cl(obj), size);
2592 partial = size > cl_offset(osc2cl(obj), index);
2595 osc_object_lock(obj);
2596 ext = osc_extent_search(obj, index);
2598 ext = first_extent(obj);
2599 else if (ext->oe_end < index)
2600 ext = next_extent(ext);
2601 while (ext != NULL) {
2602 EASSERT(ext->oe_state != OES_TRUNC, ext);
2604 if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
2605 /* if ext is in urgent state, it means there must exist
2606 * a page already having been flushed by write_page().
2607 * We have to wait for this extent because we can't
2608 * truncate that page. */
2609 LASSERT(!ext->oe_hp);
2610 OSC_EXTENT_DUMP(D_CACHE, ext,
2611 "waiting for busy extent\n");
2612 waiting = osc_extent_get(ext);
2616 osc_extent_get(ext);
2617 if (ext->oe_state == OES_ACTIVE) {
2618 /* though we grab inode mutex for write path, but we
2619 * release it before releasing extent(in osc_io_end()),
2620 * so there is a race window that an extent is still
2621 * in OES_ACTIVE when truncate starts. */
2622 LASSERT(!ext->oe_trunc_pending);
2623 ext->oe_trunc_pending = 1;
2625 EASSERT(ext->oe_state == OES_CACHE, ext);
2626 osc_extent_state_set(ext, OES_TRUNC);
2627 osc_update_pending(obj, OBD_BRW_WRITE,
2630 EASSERT(cfs_list_empty(&ext->oe_link), ext);
2631 cfs_list_add_tail(&ext->oe_link, &list);
2633 ext = next_extent(ext);
2635 osc_object_unlock(obj);
2637 osc_list_maint(cli, obj);
2639 while (!cfs_list_empty(&list)) {
2642 ext = cfs_list_entry(list.next, struct osc_extent, oe_link);
2643 cfs_list_del_init(&ext->oe_link);
2645 /* extent may be in OES_ACTIVE state because inode mutex
2646 * is released before osc_io_end() in file write case */
2647 if (ext->oe_state != OES_TRUNC)
2648 osc_extent_wait(env, ext, OES_TRUNC);
2650 rc = osc_extent_truncate(ext, index, partial);
2655 OSC_EXTENT_DUMP(D_ERROR, ext,
2656 "truncate error %d\n", rc);
2657 } else if (ext->oe_nr_pages == 0) {
2658 osc_extent_remove(ext);
2660 /* this must be an overlapped extent which means only
2661 * part of pages in this extent have been truncated.
2663 EASSERTF(ext->oe_start <= index, ext,
2664 "trunc index = %lu/%d.\n", index, partial);
2665 /* fix index to skip this partially truncated extent */
2666 index = ext->oe_end + 1;
2669 /* we need to hold this extent in OES_TRUNC state so
2670 * that no writeback will happen. This is to avoid
2672 LASSERT(oio->oi_trunc == NULL);
2673 oio->oi_trunc = osc_extent_get(ext);
2674 OSC_EXTENT_DUMP(D_CACHE, ext,
2675 "trunc at "LPU64"\n", size);
2677 osc_extent_put(env, ext);
2679 if (waiting != NULL) {
2681 result = osc_extent_wait(env, waiting, OES_INV);
2683 osc_extent_put(env, waiting);
2692 * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
2694 void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
2695 struct osc_object *obj)
2697 struct osc_extent *ext = oio->oi_trunc;
2699 oio->oi_trunc = NULL;
2701 EASSERT(ext->oe_nr_pages > 0, ext);
2702 EASSERT(ext->oe_state == OES_TRUNC, ext);
2703 EASSERT(!ext->oe_urgent, ext);
2705 OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
2706 osc_object_lock(obj);
2707 osc_extent_state_set(ext, OES_CACHE);
2708 if (ext->oe_fsync_wait && !ext->oe_urgent) {
2710 cfs_list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
2712 osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
2713 osc_object_unlock(obj);
2714 osc_extent_put(env, ext);
2716 osc_list_maint(osc_cli(obj), obj);
2721 * Wait for extents in a specific range to be written out.
2722 * The caller must have called osc_cache_writeback_range() to issue IO
2723 * otherwise it will take a long time for this function to finish.
2725 * Caller must hold inode_mutex , or cancel exclusive dlm lock so that
2726 * nobody else can dirty this range of file while we're waiting for
2727 * extents to be written.
2729 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
2730 pgoff_t start, pgoff_t end)
2732 struct osc_extent *ext;
2733 pgoff_t index = start;
2738 osc_object_lock(obj);
2739 ext = osc_extent_search(obj, index);
2741 ext = first_extent(obj);
2742 else if (ext->oe_end < index)
2743 ext = next_extent(ext);
2744 while (ext != NULL) {
2747 if (ext->oe_start > end)
2750 if (!ext->oe_fsync_wait) {
2751 ext = next_extent(ext);
2755 EASSERT(ergo(ext->oe_state == OES_CACHE,
2756 ext->oe_hp || ext->oe_urgent), ext);
2757 EASSERT(ergo(ext->oe_state == OES_ACTIVE,
2758 !ext->oe_hp && ext->oe_urgent), ext);
2760 index = ext->oe_end + 1;
2761 osc_extent_get(ext);
2762 osc_object_unlock(obj);
2764 rc = osc_extent_wait(env, ext, OES_INV);
2767 osc_extent_put(env, ext);
2770 osc_object_unlock(obj);
2772 OSC_IO_DEBUG(obj, "sync file range.\n");
2777 * Called to write out a range of osc object.
2779 * @hp : should be set this is caused by lock cancel;
2780 * @discard: is set if dirty pages should be dropped - file will be deleted or
2781 * truncated, this implies there is no partially discarding extents.
2783 * Return how many pages will be issued, or error code if error occurred.
2785 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
2786 pgoff_t start, pgoff_t end, int hp, int discard)
2788 struct osc_extent *ext;
2789 CFS_LIST_HEAD(discard_list);
2794 osc_object_lock(obj);
2795 ext = osc_extent_search(obj, start);
2797 ext = first_extent(obj);
2798 else if (ext->oe_end < start)
2799 ext = next_extent(ext);
2800 while (ext != NULL) {
2801 if (ext->oe_start > end)
2804 ext->oe_fsync_wait = 1;
2805 switch (ext->oe_state) {
2807 result += ext->oe_nr_pages;
2809 cfs_list_t *list = NULL;
2811 EASSERT(!ext->oe_hp, ext);
2813 list = &obj->oo_hp_exts;
2814 } else if (!ext->oe_urgent) {
2816 list = &obj->oo_urgent_exts;
2819 cfs_list_move_tail(&ext->oe_link, list);
2823 /* the only discarder is lock cancelling, so
2824 * [start, end] must contain this extent */
2825 EASSERT(ext->oe_start >= start &&
2826 ext->oe_max_end <= end, ext);
2827 osc_extent_state_set(ext, OES_LOCKING);
2828 ext->oe_owner = cfs_current();
2829 cfs_list_move_tail(&ext->oe_link,
2831 osc_update_pending(obj, OBD_BRW_WRITE,
2836 /* It's pretty bad to wait for ACTIVE extents, because
2837 * we don't know how long we will wait for it to be
2838 * flushed since it may be blocked at awaiting more
2839 * grants. We do this for the correctness of fsync. */
2840 LASSERT(hp == 0 && discard == 0);
2844 /* this extent is being truncated, can't do anything
2845 * for it now. it will be set to urgent after truncate
2846 * is finished in osc_cache_truncate_end(). */
2850 ext = next_extent(ext);
2852 osc_object_unlock(obj);
2854 LASSERT(ergo(!discard, cfs_list_empty(&discard_list)));
2855 if (!cfs_list_empty(&discard_list)) {
2856 struct osc_extent *tmp;
2859 osc_list_maint(osc_cli(obj), obj);
2860 cfs_list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
2861 cfs_list_del_init(&ext->oe_link);
2862 EASSERT(ext->oe_state == OES_LOCKING, ext);
2864 /* Discard caching pages. We don't actually write this
2865 * extent out but we complete it as if we did. */
2866 rc = osc_extent_make_ready(env, ext);
2867 if (unlikely(rc < 0)) {
2868 OSC_EXTENT_DUMP(D_ERROR, ext,
2869 "make_ready returned %d\n", rc);
2874 /* finish the extent as if the pages were sent */
2875 osc_extent_finish(env, ext, 0, 0);
2880 osc_io_unplug(env, osc_cli(obj), obj, PDL_POLICY_ROUND);
2882 if (hp || discard) {
2884 rc = osc_cache_wait_range(env, obj, start, end);
2885 if (result >= 0 && rc < 0)
2889 OSC_IO_DEBUG(obj, "cache page out.\n");