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staging: add Lustre file system client support
[mirror_ubuntu-hirsute-kernel.git] / drivers / staging / lustre / lustre / osc / osc_cache.c
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d7e09d03
PT		 1/*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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
19 *
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
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26/*
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, Intel Corporation.
31 *
32 */
33/*
34 * This file is part of Lustre, http://www.lustre.org/
35 * Lustre is a trademark of Sun Microsystems, Inc.
36 *
37 * osc cache management.
38 *
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
40 */
41
42#define DEBUG_SUBSYSTEM S_OSC
43
44#include "osc_cl_internal.h"
45#include "osc_internal.h"
46
47static int extent_debug; /* set it to be true for more debug */
48
49static void osc_update_pending(struct osc_object *obj, int cmd, int delta);
50static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
51 int state);
52static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
53 struct osc_async_page *oap, int sent, int rc);
54static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
55 int cmd);
56static int osc_refresh_count(const struct lu_env *env,
57 struct osc_async_page *oap, int cmd);
58static int osc_io_unplug_async(const struct lu_env *env,
59 struct client_obd *cli, struct osc_object *osc);
60static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
61 unsigned int lost_grant);
62
63static 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__)
67
68/** \addtogroup osc
69 * @{
70 */
71
72/* ------------------ osc extent ------------------ */
73static inline char *ext_flags(struct osc_extent *ext, char *flags)
74{
75 char *buf = flags;
76 *buf++ = ext->oe_rw ? 'r' : 'w';
77 if (ext->oe_intree)
78 *buf++ = 'i';
79 if (ext->oe_srvlock)
80 *buf++ = 's';
81 if (ext->oe_hp)
82 *buf++ = 'h';
83 if (ext->oe_urgent)
84 *buf++ = 'u';
85 if (ext->oe_memalloc)
86 *buf++ = 'm';
87 if (ext->oe_trunc_pending)
88 *buf++ = 't';
89 if (ext->oe_fsync_wait)
90 *buf++ = 'Y';
91 *buf = 0;
92 return flags;
93}
94
95static inline char list_empty_marker(struct list_head *list)
96{
97 return list_empty(list) ? '-' : '+';
98}
99
100#define EXTSTR "[%lu -> %lu/%lu]"
101#define EXTPARA(ext) (ext)->oe_start, (ext)->oe_end, (ext)->oe_max_end
102
103#define OSC_EXTENT_DUMP(lvl, extent, fmt, ...) do { \
104 struct osc_extent *__ext = (extent); \
105 const char *__str[] = OES_STRINGS; \
106 char __buf[16]; \
107 \
108 CDEBUG(lvl, \
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 atomic_read(&__ext->oe_refc), \
115 atomic_read(&__ext->oe_users), \
116 list_empty_marker(&__ext->oe_link), \
117 __str[__ext->oe_state], ext_flags(__ext, __buf), \
118 __ext->oe_obj, \
119 /* ----- part 2 ----- */ \
120 __ext->oe_grants, __ext->oe_nr_pages, \
121 list_empty_marker(&__ext->oe_pages), \
122 waitqueue_active(&__ext->oe_waitq) ? '+' : '-', \
123 __ext->oe_osclock, __ext->oe_mppr, __ext->oe_owner, \
124 /* ----- part 4 ----- */ \
125 ## __VA_ARGS__); \
126} while (0)
127
128#undef EASSERTF
129#define EASSERTF(expr, ext, fmt, args...) do { \
130 if (!(expr)) { \
131 OSC_EXTENT_DUMP(D_ERROR, (ext), fmt, ##args); \
132 osc_extent_tree_dump(D_ERROR, (ext)->oe_obj); \
133 LASSERT(expr); \
134 } \
135} while (0)
136
137#undef EASSERT
138#define EASSERT(expr, ext) EASSERTF(expr, ext, "\n")
139
140static inline struct osc_extent *rb_extent(struct rb_node *n)
141{
142 if (n == NULL)
143 return NULL;
144
145 return container_of(n, struct osc_extent, oe_node);
146}
147
148static inline struct osc_extent *next_extent(struct osc_extent *ext)
149{
150 if (ext == NULL)
151 return NULL;
152
153 LASSERT(ext->oe_intree);
154 return rb_extent(rb_next(&ext->oe_node));
155}
156
157static inline struct osc_extent *prev_extent(struct osc_extent *ext)
158{
159 if (ext == NULL)
160 return NULL;
161
162 LASSERT(ext->oe_intree);
163 return rb_extent(rb_prev(&ext->oe_node));
164}
165
166static inline struct osc_extent *first_extent(struct osc_object *obj)
167{
168 return rb_extent(rb_first(&obj->oo_root));
169}
170
171/* object must be locked by caller. */
172static int osc_extent_sanity_check0(struct osc_extent *ext,
173 const char *func, const int line)
174{
175 struct osc_object *obj = ext->oe_obj;
176 struct osc_async_page *oap;
177 int page_count;
178 int rc = 0;
179
180 if (!osc_object_is_locked(obj))
181 GOTO(out, rc = 9);
182
183 if (ext->oe_state >= OES_STATE_MAX)
184 GOTO(out, rc = 10);
185
186 if (atomic_read(&ext->oe_refc) <= 0)
187 GOTO(out, rc = 20);
188
189 if (atomic_read(&ext->oe_refc) < atomic_read(&ext->oe_users))
190 GOTO(out, rc = 30);
191
192 switch (ext->oe_state) {
193 case OES_INV:
194 if (ext->oe_nr_pages > 0 || !list_empty(&ext->oe_pages))
195 GOTO(out, rc = 35);
196 GOTO(out, rc = 0);
197 break;
198 case OES_ACTIVE:
199 if (atomic_read(&ext->oe_users) == 0)
200 GOTO(out, rc = 40);
201 if (ext->oe_hp)
202 GOTO(out, rc = 50);
203 if (ext->oe_fsync_wait && !ext->oe_urgent)
204 GOTO(out, rc = 55);
205 break;
206 case OES_CACHE:
207 if (ext->oe_grants == 0)
208 GOTO(out, rc = 60);
209 if (ext->oe_fsync_wait && !ext->oe_urgent && !ext->oe_hp)
210 GOTO(out, rc = 65);
211 default:
212 if (atomic_read(&ext->oe_users) > 0)
213 GOTO(out, rc = 70);
214 }
215
216 if (ext->oe_max_end < ext->oe_end || ext->oe_end < ext->oe_start)
217 GOTO(out, rc = 80);
218
219 if (ext->oe_osclock == NULL && ext->oe_grants > 0)
220 GOTO(out, rc = 90);
221
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))
227 GOTO(out, rc = 100);
228 }
229
230 if (ext->oe_nr_pages > ext->oe_mppr)
231 GOTO(out, rc = 105);
232
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)
236 GOTO(out, rc = 0);
237
238 if (!extent_debug)
239 GOTO(out, rc = 0);
240
241 page_count = 0;
242 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
243 pgoff_t index = oap2cl_page(oap)->cp_index;
244 ++page_count;
245 if (index > ext->oe_end || index < ext->oe_start)
246 GOTO(out, rc = 110);
247 }
248 if (page_count != ext->oe_nr_pages)
249 GOTO(out, rc = 120);
250
251out:
252 if (rc != 0)
253 OSC_EXTENT_DUMP(D_ERROR, ext,
254 "%s:%d sanity check %p failed with rc = %d\n",
255 func, line, ext, rc);
256 return rc;
257}
258
259#define sanity_check_nolock(ext) \
260 osc_extent_sanity_check0(ext, __func__, __LINE__)
261
262#define sanity_check(ext) ({ \
263 int __res; \
264 osc_object_lock((ext)->oe_obj); \
265 __res = sanity_check_nolock(ext); \
266 osc_object_unlock((ext)->oe_obj); \
267 __res; \
268})
269
270
271/**
272 * sanity check - to make sure there is no overlapped extent in the tree.
273 */
274static int osc_extent_is_overlapped(struct osc_object *obj,
275 struct osc_extent *ext)
276{
277 struct osc_extent *tmp;
278
279 LASSERT(osc_object_is_locked(obj));
280
281 if (!extent_debug)
282 return 0;
283
284 for (tmp = first_extent(obj); tmp != NULL; tmp = next_extent(tmp)) {
285 if (tmp == ext)
286 continue;
287 if (tmp->oe_end >= ext->oe_start &&
288 tmp->oe_start <= ext->oe_end)
289 return 1;
290 }
291 return 0;
292}
293
294static void osc_extent_state_set(struct osc_extent *ext, int state)
295{
296 LASSERT(osc_object_is_locked(ext->oe_obj));
297 LASSERT(state >= OES_INV && state < OES_STATE_MAX);
298
299 /* Never try to sanity check a state changing extent :-) */
300 /* LASSERT(sanity_check_nolock(ext) == 0); */
301
302 /* TODO: validate the state machine */
303 ext->oe_state = state;
304 wake_up_all(&ext->oe_waitq);
305}
306
307static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
308{
309 struct osc_extent *ext;
310
311 OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_IOFS);
312 if (ext == NULL)
313 return NULL;
314
315 RB_CLEAR_NODE(&ext->oe_node);
316 ext->oe_obj = obj;
317 atomic_set(&ext->oe_refc, 1);
318 atomic_set(&ext->oe_users, 0);
319 INIT_LIST_HEAD(&ext->oe_link);
320 ext->oe_state = OES_INV;
321 INIT_LIST_HEAD(&ext->oe_pages);
322 init_waitqueue_head(&ext->oe_waitq);
323 ext->oe_osclock = NULL;
324
325 return ext;
326}
327
328static void osc_extent_free(struct osc_extent *ext)
329{
330 OBD_SLAB_FREE_PTR(ext, osc_extent_kmem);
331}
332
333static struct osc_extent *osc_extent_get(struct osc_extent *ext)
334{
335 LASSERT(atomic_read(&ext->oe_refc) >= 0);
336 atomic_inc(&ext->oe_refc);
337 return ext;
338}
339
340static void osc_extent_put(const struct lu_env *env, struct osc_extent *ext)
341{
342 LASSERT(atomic_read(&ext->oe_refc) > 0);
343 if (atomic_dec_and_test(&ext->oe_refc)) {
344 LASSERT(list_empty(&ext->oe_link));
345 LASSERT(atomic_read(&ext->oe_users) == 0);
346 LASSERT(ext->oe_state == OES_INV);
347 LASSERT(!ext->oe_intree);
348
349 if (ext->oe_osclock) {
350 cl_lock_put(env, ext->oe_osclock);
351 ext->oe_osclock = NULL;
352 }
353 osc_extent_free(ext);
354 }
355}
356
357/**
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 ;-).
361 */
362static void osc_extent_put_trust(struct osc_extent *ext)
363{
364 LASSERT(atomic_read(&ext->oe_refc) > 1);
365 LASSERT(osc_object_is_locked(ext->oe_obj));
366 atomic_dec(&ext->oe_refc);
367}
368
369/**
370 * Return the extent which includes pgoff @index, or return the greatest
371 * previous extent in the tree.
372 */
373static struct osc_extent *osc_extent_search(struct osc_object *obj,
374 pgoff_t index)
375{
376 struct rb_node *n = obj->oo_root.rb_node;
377 struct osc_extent *tmp, *p = NULL;
378
379 LASSERT(osc_object_is_locked(obj));
380 while (n != NULL) {
381 tmp = rb_extent(n);
382 if (index < tmp->oe_start) {
383 n = n->rb_left;
384 } else if (index > tmp->oe_end) {
385 p = rb_extent(n);
386 n = n->rb_right;
387 } else {
388 return tmp;
389 }
390 }
391 return p;
392}
393
394/*
395 * Return the extent covering @index, otherwise return NULL.
396 * caller must have held object lock.
397 */
398static struct osc_extent *osc_extent_lookup(struct osc_object *obj,
399 pgoff_t index)
400{
401 struct osc_extent *ext;
402
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);
406 return NULL;
407}
408
409/* caller must have held object lock. */
410static void osc_extent_insert(struct osc_object *obj, struct osc_extent *ext)
411{
412 struct rb_node **n = &obj->oo_root.rb_node;
413 struct rb_node *parent = NULL;
414 struct osc_extent *tmp;
415
416 LASSERT(ext->oe_intree == 0);
417 LASSERT(ext->oe_obj == obj);
418 LASSERT(osc_object_is_locked(obj));
419 while (*n != NULL) {
420 tmp = rb_extent(*n);
421 parent = *n;
422
423 if (ext->oe_end < tmp->oe_start)
424 n = &(*n)->rb_left;
425 else if (ext->oe_start > tmp->oe_end)
426 n = &(*n)->rb_right;
427 else
428 EASSERTF(0, tmp, EXTSTR, EXTPARA(ext));
429 }
430 rb_link_node(&ext->oe_node, parent, n);
431 rb_insert_color(&ext->oe_node, &obj->oo_root);
432 osc_extent_get(ext);
433 ext->oe_intree = 1;
434}
435
436/* caller must have held object lock. */
437static void osc_extent_erase(struct osc_extent *ext)
438{
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);
443 ext->oe_intree = 0;
444 /* rbtree held a refcount */
445 osc_extent_put_trust(ext);
446 }
447}
448
449static struct osc_extent *osc_extent_hold(struct osc_extent *ext)
450{
451 struct osc_object *obj = ext->oe_obj;
452
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);
458 }
459 atomic_inc(&ext->oe_users);
460 list_del_init(&ext->oe_link);
461 return osc_extent_get(ext);
462}
463
464static void __osc_extent_remove(struct osc_extent *ext)
465{
466 LASSERT(osc_object_is_locked(ext->oe_obj));
467 LASSERT(list_empty(&ext->oe_pages));
468 osc_extent_erase(ext);
469 list_del_init(&ext->oe_link);
470 osc_extent_state_set(ext, OES_INV);
471 OSC_EXTENT_DUMP(D_CACHE, ext, "destroyed.\n");
472}
473
474static void osc_extent_remove(struct osc_extent *ext)
475{
476 struct osc_object *obj = ext->oe_obj;
477
478 osc_object_lock(obj);
479 __osc_extent_remove(ext);
480 osc_object_unlock(obj);
481}
482
483/**
484 * This function is used to merge extents to get better performance. It checks
485 * if @cur and @victim are contiguous at chunk level.
486 */
487static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
488 struct osc_extent *victim)
489{
490 struct osc_object *obj = cur->oe_obj;
491 pgoff_t chunk_start;
492 pgoff_t chunk_end;
493 int ppc_bits;
494
495 LASSERT(cur->oe_state == OES_CACHE);
496 LASSERT(osc_object_is_locked(obj));
497 if (victim == NULL)
498 return -EINVAL;
499
500 if (victim->oe_state != OES_CACHE || victim->oe_fsync_wait)
501 return -EBUSY;
502
503 if (cur->oe_max_end != victim->oe_max_end)
504 return -ERANGE;
505
506 LASSERT(cur->oe_osclock == victim->oe_osclock);
507 ppc_bits = osc_cli(obj)->cl_chunkbits - PAGE_CACHE_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)
512 return -ERANGE;
513
514 OSC_EXTENT_DUMP(D_CACHE, victim, "will be merged by %p.\n", cur);
515
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 list_splice_init(&victim->oe_pages, &cur->oe_pages);
524 list_del_init(&victim->oe_link);
525 victim->oe_nr_pages = 0;
526
527 osc_extent_get(victim);
528 __osc_extent_remove(victim);
529 osc_extent_put(env, victim);
530
531 OSC_EXTENT_DUMP(D_CACHE, cur, "after merging %p.\n", victim);
532 return 0;
533}
534
535/**
536 * Drop user count of osc_extent, and unplug IO asynchronously.
537 */
538int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
539{
540 struct osc_object *obj = ext->oe_obj;
541 int rc = 0;
542 ENTRY;
543
544 LASSERT(atomic_read(&ext->oe_users) > 0);
545 LASSERT(sanity_check(ext) == 0);
546 LASSERT(ext->oe_grants > 0);
547
548 if (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;
556 } else {
557 osc_extent_state_set(ext, OES_CACHE);
558 osc_update_pending(obj, OBD_BRW_WRITE,
559 ext->oe_nr_pages);
560
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));
564
565 if (ext->oe_urgent)
566 list_move_tail(&ext->oe_link,
567 &obj->oo_urgent_exts);
568 }
569 osc_object_unlock(obj);
570
571 osc_io_unplug_async(env, osc_cli(obj), obj);
572 }
573 osc_extent_put(env, ext);
574 RETURN(rc);
575}
576
577static inline int overlapped(struct osc_extent *ex1, struct osc_extent *ex2)
578{
579 return !(ex1->oe_end < ex2->oe_start || ex2->oe_end < ex1->oe_start);
580}
581
582/**
583 * Find or create an extent which includes @index, core function to manage
584 * extent tree.
585 */
586struct osc_extent *osc_extent_find(const struct lu_env *env,
587 struct osc_object *obj, pgoff_t index,
588 int *grants)
589
590{
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;
597 pgoff_t chunk;
598 pgoff_t max_end;
599 int max_pages; /* max_pages_per_rpc */
600 int chunksize;
601 int ppc_bits; /* pages per chunk bits */
602 int chunk_mask;
603 int rc;
604 ENTRY;
605
606 cur = osc_extent_alloc(obj);
607 if (cur == NULL)
608 RETURN(ERR_PTR(-ENOMEM));
609
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);
613
614 LASSERT(cli->cl_chunkbits >= PAGE_CACHE_SHIFT);
615 ppc_bits = cli->cl_chunkbits - PAGE_CACHE_SHIFT;
616 chunk_mask = ~((1 << ppc_bits) - 1);
617 chunksize = 1 << cli->cl_chunkbits;
618 chunk = index >> ppc_bits;
619
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);
625
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;
635 cur->oe_grants = 0;
636 cur->oe_mppr = max_pages;
637
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));
642
643restart:
644 osc_object_lock(obj);
645 ext = osc_extent_search(obj, cur->oe_start);
646 if (ext == NULL)
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;
651
652 LASSERT(sanity_check_nolock(ext) == 0);
653 if (chunk > ext_chk_end + 1)
654 break;
655
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));
660
661 ext = next_extent(ext);
662 continue;
663 }
664
665 /* discontiguous chunks? */
666 if (chunk + 1 < ext_chk_start) {
667 ext = next_extent(ext);
668 continue;
669 }
670
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. */
674
675 if (overlapped(ext, cur)) {
676 /* cur is the minimum unit, so overlapping means
677 * full contain. */
678 EASSERTF((ext->oe_start <= cur->oe_start &&
679 ext->oe_end >= cur->oe_end),
680 ext, EXTSTR, EXTPARA(cur));
681
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);
686 break;
687 }
688
689 found = osc_extent_hold(ext);
690 break;
691 }
692
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);
699 continue;
700 }
701
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);
709 continue;
710 }
711
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. */
717
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);
722
723 /* pull ext's start back to cover cur */
724 ext->oe_start = cur->oe_start;
725 ext->oe_grants += chunksize;
726 *grants -= chunksize;
727
728 found = osc_extent_hold(ext);
729 } else if (chunk == ext_chk_end + 1) {
730 /* rear merge */
731 ext->oe_end = cur->oe_end;
732 ext->oe_grants += chunksize;
733 *grants -= chunksize;
734
735 /* try to merge with the next one because we just fill
736 * in a gap */
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;
740
741 found = osc_extent_hold(ext);
742 }
743 if (found != NULL)
744 break;
745
746 ext = next_extent(ext);
747 }
748
749 osc_extent_tree_dump(D_CACHE, obj);
750 if (found != NULL) {
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);
756 }
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);
763
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);
769 }
770 osc_object_unlock(obj);
771
772 if (conflict != NULL) {
773 LASSERT(found == NULL);
774
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);
779 conflict = NULL;
780 if (rc < 0)
781 GOTO(out, found = ERR_PTR(rc));
782
783 goto restart;
784 }
785 EXIT;
786
787out:
788 osc_extent_put(env, cur);
789 LASSERT(*grants >= 0);
790 return found;
791}
792
793/**
794 * Called when IO is finished to an extent.
795 */
796int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
797 int sent, int rc)
798{
799 struct client_obd *cli = osc_cli(ext->oe_obj);
800 struct osc_async_page *oap;
801 struct osc_async_page *tmp;
802 int nr_pages = ext->oe_nr_pages;
803 int lost_grant = 0;
804 int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
805 __u64 last_off = 0;
806 int last_count = -1;
807 ENTRY;
808
809 OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n");
810
811 ext->oe_rc = rc ?: ext->oe_nr_pages;
812 EASSERT(ergo(rc == 0, ext->oe_state == OES_RPC), ext);
813 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
814 oap_pending_item) {
815 list_del_init(&oap->oap_rpc_item);
816 list_del_init(&oap->oap_pending_item);
817 if (last_off <= oap->oap_obj_off) {
818 last_off = oap->oap_obj_off;
819 last_count = oap->oap_count;
820 }
821
822 --ext->oe_nr_pages;
823 osc_ap_completion(env, cli, oap, sent, rc);
824 }
825 EASSERT(ext->oe_nr_pages == 0, ext);
826
827 if (!sent) {
828 lost_grant = ext->oe_grants;
829 } else if (blocksize < PAGE_CACHE_SIZE &&
830 last_count != PAGE_CACHE_SIZE) {
831 /* For short writes we shouldn't count parts of pages that
832 * span a whole chunk on the OST side, or our accounting goes
833 * wrong. Should match the code in filter_grant_check. */
834 int offset = oap->oap_page_off & ~CFS_PAGE_MASK;
835 int count = oap->oap_count + (offset & (blocksize - 1));
836 int end = (offset + oap->oap_count) & (blocksize - 1);
837 if (end)
838 count += blocksize - end;
839
840 lost_grant = PAGE_CACHE_SIZE - count;
841 }
842 if (ext->oe_grants > 0)
843 osc_free_grant(cli, nr_pages, lost_grant);
844
845 osc_extent_remove(ext);
846 /* put the refcount for RPC */
847 osc_extent_put(env, ext);
848 RETURN(0);
849}
850
851static int extent_wait_cb(struct osc_extent *ext, int state)
852{
853 int ret;
854
855 osc_object_lock(ext->oe_obj);
856 ret = ext->oe_state == state;
857 osc_object_unlock(ext->oe_obj);
858
859 return ret;
860}
861
862/**
863 * Wait for the extent's state to become @state.
864 */
865static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
866 int state)
867{
868 struct osc_object *obj = ext->oe_obj;
869 struct l_wait_info lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(600), NULL,
870 LWI_ON_SIGNAL_NOOP, NULL);
871 int rc = 0;
872 ENTRY;
873
874 osc_object_lock(obj);
875 LASSERT(sanity_check_nolock(ext) == 0);
876 /* `Kick' this extent only if the caller is waiting for it to be
877 * written out. */
878 if (state == OES_INV && !ext->oe_urgent && !ext->oe_hp) {
879 if (ext->oe_state == OES_ACTIVE) {
880 ext->oe_urgent = 1;
881 } else if (ext->oe_state == OES_CACHE) {
882 ext->oe_urgent = 1;
883 osc_extent_hold(ext);
884 rc = 1;
885 }
886 }
887 osc_object_unlock(obj);
888 if (rc == 1)
889 osc_extent_release(env, ext);
890
891 /* wait for the extent until its state becomes @state */
892 rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state), &lwi);
893 if (rc == -ETIMEDOUT) {
894 OSC_EXTENT_DUMP(D_ERROR, ext,
895 "%s: wait ext to %d timedout, recovery in progress?\n",
896 osc_export(obj)->exp_obd->obd_name, state);
897
898 lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
899 rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state),
900 &lwi);
901 }
902 if (rc == 0 && ext->oe_rc < 0)
903 rc = ext->oe_rc;
904 RETURN(rc);
905}
906
907/**
908 * Discard pages with index greater than @size. If @ext is overlapped with
909 * @size, then partial truncate happens.
910 */
911static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
912 bool partial)
913{
914 struct cl_env_nest nest;
915 struct lu_env *env;
916 struct cl_io *io;
917 struct osc_object *obj = ext->oe_obj;
918 struct client_obd *cli = osc_cli(obj);
919 struct osc_async_page *oap;
920 struct osc_async_page *tmp;
921 int pages_in_chunk = 0;
922 int ppc_bits = cli->cl_chunkbits - PAGE_CACHE_SHIFT;
923 __u64 trunc_chunk = trunc_index >> ppc_bits;
924 int grants = 0;
925 int nr_pages = 0;
926 int rc = 0;
927 ENTRY;
928
929 LASSERT(sanity_check(ext) == 0);
930 LASSERT(ext->oe_state == OES_TRUNC);
931 LASSERT(!ext->oe_urgent);
932
933 /* Request new lu_env.
934 * We can't use that env from osc_cache_truncate_start() because
935 * it's from lov_io_sub and not fully initialized. */
936 env = cl_env_nested_get(&nest);
937 io = &osc_env_info(env)->oti_io;
938 io->ci_obj = cl_object_top(osc2cl(obj));
939 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
940 if (rc < 0)
941 GOTO(out, rc);
942
943 /* discard all pages with index greater then trunc_index */
944 list_for_each_entry_safe(oap, tmp, &ext->oe_pages,
945 oap_pending_item) {
946 struct cl_page *sub = oap2cl_page(oap);
947 struct cl_page *page = cl_page_top(sub);
948
949 LASSERT(list_empty(&oap->oap_rpc_item));
950
951 /* only discard the pages with their index greater than
952 * trunc_index, and ... */
953 if (sub->cp_index < trunc_index ||
954 (sub->cp_index == trunc_index && partial)) {
955 /* accounting how many pages remaining in the chunk
956 * so that we can calculate grants correctly. */
957 if (sub->cp_index >> ppc_bits == trunc_chunk)
958 ++pages_in_chunk;
959 continue;
960 }
961
962 list_del_init(&oap->oap_pending_item);
963
964 cl_page_get(page);
965 lu_ref_add(&page->cp_reference, "truncate", current);
966
967 if (cl_page_own(env, io, page) == 0) {
968 cl_page_unmap(env, io, page);
969 cl_page_discard(env, io, page);
970 cl_page_disown(env, io, page);
971 } else {
972 LASSERT(page->cp_state == CPS_FREEING);
973 LASSERT(0);
974 }
975
976 lu_ref_del(&page->cp_reference, "truncate", current);
977 cl_page_put(env, page);
978
979 --ext->oe_nr_pages;
980 ++nr_pages;
981 }
982 EASSERTF(ergo(ext->oe_start >= trunc_index + !!partial,
983 ext->oe_nr_pages == 0),
984 ext, "trunc_index %lu, partial %d\n", trunc_index, partial);
985
986 osc_object_lock(obj);
987 if (ext->oe_nr_pages == 0) {
988 LASSERT(pages_in_chunk == 0);
989 grants = ext->oe_grants;
990 ext->oe_grants = 0;
991 } else { /* calculate how many grants we can free */
992 int chunks = (ext->oe_end >> ppc_bits) - trunc_chunk;
993 pgoff_t last_index;
994
995
996 /* if there is no pages in this chunk, we can also free grants
997 * for the last chunk */
998 if (pages_in_chunk == 0) {
999 /* if this is the 1st chunk and no pages in this chunk,
1000 * ext->oe_nr_pages must be zero, so we should be in
1001 * the other if-clause. */
1002 LASSERT(trunc_chunk > 0);
1003 --trunc_chunk;
1004 ++chunks;
1005 }
1006
1007 /* this is what we can free from this extent */
1008 grants = chunks << cli->cl_chunkbits;
1009 ext->oe_grants -= grants;
1010 last_index = ((trunc_chunk + 1) << ppc_bits) - 1;
1011 ext->oe_end = min(last_index, ext->oe_max_end);
1012 LASSERT(ext->oe_end >= ext->oe_start);
1013 LASSERT(ext->oe_grants > 0);
1014 }
1015 osc_object_unlock(obj);
1016
1017 if (grants > 0 || nr_pages > 0)
1018 osc_free_grant(cli, nr_pages, grants);
1019
1020out:
1021 cl_io_fini(env, io);
1022 cl_env_nested_put(&nest, env);
1023 RETURN(rc);
1024}
1025
1026/**
1027 * This function is used to make the extent prepared for transfer.
1028 * A race with flusing page - ll_writepage() has to be handled cautiously.
1029 */
1030static int osc_extent_make_ready(const struct lu_env *env,
1031 struct osc_extent *ext)
1032{
1033 struct osc_async_page *oap;
1034 struct osc_async_page *last = NULL;
1035 struct osc_object *obj = ext->oe_obj;
1036 int page_count = 0;
1037 int rc;
1038 ENTRY;
1039
1040 /* we're going to grab page lock, so object lock must not be taken. */
1041 LASSERT(sanity_check(ext) == 0);
1042 /* in locking state, any process should not touch this extent. */
1043 EASSERT(ext->oe_state == OES_LOCKING, ext);
1044 EASSERT(ext->oe_owner != NULL, ext);
1045
1046 OSC_EXTENT_DUMP(D_CACHE, ext, "make ready\n");
1047
1048 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1049 ++page_count;
1050 if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
1051 last = oap;
1052
1053 /* checking ASYNC_READY is race safe */
1054 if ((oap->oap_async_flags & ASYNC_READY) != 0)
1055 continue;
1056
1057 rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
1058 switch (rc) {
1059 case 0:
1060 spin_lock(&oap->oap_lock);
1061 oap->oap_async_flags |= ASYNC_READY;
1062 spin_unlock(&oap->oap_lock);
1063 break;
1064 case -EALREADY:
1065 LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
1066 break;
1067 default:
1068 LASSERTF(0, "unknown return code: %d\n", rc);
1069 }
1070 }
1071
1072 LASSERT(page_count == ext->oe_nr_pages);
1073 LASSERT(last != NULL);
1074 /* the last page is the only one we need to refresh its count by
1075 * the size of file. */
1076 if (!(last->oap_async_flags & ASYNC_COUNT_STABLE)) {
1077 last->oap_count = osc_refresh_count(env, last, OBD_BRW_WRITE);
1078 LASSERT(last->oap_count > 0);
1079 LASSERT(last->oap_page_off + last->oap_count <= PAGE_CACHE_SIZE);
1080 last->oap_async_flags |= ASYNC_COUNT_STABLE;
1081 }
1082
1083 /* for the rest of pages, we don't need to call osf_refresh_count()
1084 * because it's known they are not the last page */
1085 list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
1086 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
1087 oap->oap_count = PAGE_CACHE_SIZE - oap->oap_page_off;
1088 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
1089 }
1090 }
1091
1092 osc_object_lock(obj);
1093 osc_extent_state_set(ext, OES_RPC);
1094 osc_object_unlock(obj);
1095 /* get a refcount for RPC. */
1096 osc_extent_get(ext);
1097
1098 RETURN(0);
1099}
1100
1101/**
1102 * Quick and simple version of osc_extent_find(). This function is frequently
1103 * called to expand the extent for the same IO. To expand the extent, the
1104 * page index must be in the same or next chunk of ext->oe_end.
1105 */
1106static int osc_extent_expand(struct osc_extent *ext, pgoff_t index, int *grants)
1107{
1108 struct osc_object *obj = ext->oe_obj;
1109 struct client_obd *cli = osc_cli(obj);
1110 struct osc_extent *next;
1111 int ppc_bits = cli->cl_chunkbits - PAGE_CACHE_SHIFT;
1112 pgoff_t chunk = index >> ppc_bits;
1113 pgoff_t end_chunk;
1114 pgoff_t end_index;
1115 int chunksize = 1 << cli->cl_chunkbits;
1116 int rc = 0;
1117 ENTRY;
1118
1119 LASSERT(ext->oe_max_end >= index && ext->oe_start <= index);
1120 osc_object_lock(obj);
1121 LASSERT(sanity_check_nolock(ext) == 0);
1122 end_chunk = ext->oe_end >> ppc_bits;
1123 if (chunk > end_chunk + 1)
1124 GOTO(out, rc = -ERANGE);
1125
1126 if (end_chunk >= chunk)
1127 GOTO(out, rc = 0);
1128
1129 LASSERT(end_chunk + 1 == chunk);
1130 /* try to expand this extent to cover @index */
1131 end_index = min(ext->oe_max_end, ((chunk + 1) << ppc_bits) - 1);
1132
1133 next = next_extent(ext);
1134 if (next != NULL && next->oe_start <= end_index)
1135 /* complex mode - overlapped with the next extent,
1136 * this case will be handled by osc_extent_find() */
1137 GOTO(out, rc = -EAGAIN);
1138
1139 ext->oe_end = end_index;
1140 ext->oe_grants += chunksize;
1141 *grants -= chunksize;
1142 LASSERT(*grants >= 0);
1143 EASSERTF(osc_extent_is_overlapped(obj, ext) == 0, ext,
1144 "overlapped after expanding for %lu.\n", index);
1145 EXIT;
1146
1147out:
1148 osc_object_unlock(obj);
1149 RETURN(rc);
1150}
1151
1152static void osc_extent_tree_dump0(int level, struct osc_object *obj,
1153 const char *func, int line)
1154{
1155 struct osc_extent *ext;
1156 int cnt;
1157
1158 CDEBUG(level, "Dump object %p extents at %s:%d, mppr: %u.\n",
1159 obj, func, line, osc_cli(obj)->cl_max_pages_per_rpc);
1160
1161 /* osc_object_lock(obj); */
1162 cnt = 1;
1163 for (ext = first_extent(obj); ext != NULL; ext = next_extent(ext))
1164 OSC_EXTENT_DUMP(level, ext, "in tree %d.\n", cnt++);
1165
1166 cnt = 1;
1167 list_for_each_entry(ext, &obj->oo_hp_exts, oe_link)
1168 OSC_EXTENT_DUMP(level, ext, "hp %d.\n", cnt++);
1169
1170 cnt = 1;
1171 list_for_each_entry(ext, &obj->oo_urgent_exts, oe_link)
1172 OSC_EXTENT_DUMP(level, ext, "urgent %d.\n", cnt++);
1173
1174 cnt = 1;
1175 list_for_each_entry(ext, &obj->oo_reading_exts, oe_link)
1176 OSC_EXTENT_DUMP(level, ext, "reading %d.\n", cnt++);
1177 /* osc_object_unlock(obj); */
1178}
1179
1180/* ------------------ osc extent end ------------------ */
1181
1182static inline int osc_is_ready(struct osc_object *osc)
1183{
1184 return !list_empty(&osc->oo_ready_item) ||
1185 !list_empty(&osc->oo_hp_ready_item);
1186}
1187
1188#define OSC_IO_DEBUG(OSC, STR, args...) \
1189 CDEBUG(D_CACHE, "obj %p ready %d|%c|%c wr %d|%c|%c rd %d|%c " STR, \
1190 (OSC), osc_is_ready(OSC), \
1191 list_empty_marker(&(OSC)->oo_hp_ready_item), \
1192 list_empty_marker(&(OSC)->oo_ready_item), \
1193 atomic_read(&(OSC)->oo_nr_writes), \
1194 list_empty_marker(&(OSC)->oo_hp_exts), \
1195 list_empty_marker(&(OSC)->oo_urgent_exts), \
1196 atomic_read(&(OSC)->oo_nr_reads), \
1197 list_empty_marker(&(OSC)->oo_reading_exts), \
1198 ##args)
1199
1200static int osc_make_ready(const struct lu_env *env, struct osc_async_page *oap,
1201 int cmd)
1202{
1203 struct osc_page *opg = oap2osc_page(oap);
1204 struct cl_page *page = cl_page_top(oap2cl_page(oap));
1205 int result;
1206
1207 LASSERT(cmd == OBD_BRW_WRITE); /* no cached reads */
1208
1209 ENTRY;
1210 result = cl_page_make_ready(env, page, CRT_WRITE);
1211 if (result == 0)
1212 opg->ops_submit_time = cfs_time_current();
1213 RETURN(result);
1214}
1215
1216static int osc_refresh_count(const struct lu_env *env,
1217 struct osc_async_page *oap, int cmd)
1218{
1219 struct osc_page *opg = oap2osc_page(oap);
1220 struct cl_page *page = oap2cl_page(oap);
1221 struct cl_object *obj;
1222 struct cl_attr *attr = &osc_env_info(env)->oti_attr;
1223
1224 int result;
1225 loff_t kms;
1226
1227 /* readpage queues with _COUNT_STABLE, shouldn't get here. */
1228 LASSERT(!(cmd & OBD_BRW_READ));
1229 LASSERT(opg != NULL);
1230 obj = opg->ops_cl.cpl_obj;
1231
1232 cl_object_attr_lock(obj);
1233 result = cl_object_attr_get(env, obj, attr);
1234 cl_object_attr_unlock(obj);
1235 if (result < 0)
1236 return result;
1237 kms = attr->cat_kms;
1238 if (cl_offset(obj, page->cp_index) >= kms)
1239 /* catch race with truncate */
1240 return 0;
1241 else if (cl_offset(obj, page->cp_index + 1) > kms)
1242 /* catch sub-page write at end of file */
1243 return kms % PAGE_CACHE_SIZE;
1244 else
1245 return PAGE_CACHE_SIZE;
1246}
1247
1248static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
1249 int cmd, int rc)
1250{
1251 struct osc_page *opg = oap2osc_page(oap);
1252 struct cl_page *page = cl_page_top(oap2cl_page(oap));
1253 struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
1254 enum cl_req_type crt;
1255 int srvlock;
1256
1257 ENTRY;
1258
1259 cmd &= ~OBD_BRW_NOQUOTA;
1260 LASSERT(equi(page->cp_state == CPS_PAGEIN, cmd == OBD_BRW_READ));
1261 LASSERT(equi(page->cp_state == CPS_PAGEOUT, cmd == OBD_BRW_WRITE));
1262 LASSERT(opg->ops_transfer_pinned);
1263
1264 /*
1265 * page->cp_req can be NULL if io submission failed before
1266 * cl_req was allocated.
1267 */
1268 if (page->cp_req != NULL)
1269 cl_req_page_done(env, page);
1270 LASSERT(page->cp_req == NULL);
1271
1272 crt = cmd == OBD_BRW_READ ? CRT_READ : CRT_WRITE;
1273 /* Clear opg->ops_transfer_pinned before VM lock is released. */
1274 opg->ops_transfer_pinned = 0;
1275
1276 spin_lock(&obj->oo_seatbelt);
1277 LASSERT(opg->ops_submitter != NULL);
1278 LASSERT(!list_empty(&opg->ops_inflight));
1279 list_del_init(&opg->ops_inflight);
1280 opg->ops_submitter = NULL;
1281 spin_unlock(&obj->oo_seatbelt);
1282
1283 opg->ops_submit_time = 0;
1284 srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
1285
1286 /* statistic */
1287 if (rc == 0 && srvlock) {
1288 struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
1289 struct osc_stats *stats = &lu2osc_dev(ld)->od_stats;
1290 int bytes = oap->oap_count;
1291
1292 if (crt == CRT_READ)
1293 stats->os_lockless_reads += bytes;
1294 else
1295 stats->os_lockless_writes += bytes;
1296 }
1297
1298 /*
1299 * This has to be the last operation with the page, as locks are
1300 * released in cl_page_completion() and nothing except for the
1301 * reference counter protects page from concurrent reclaim.
1302 */
1303 lu_ref_del(&page->cp_reference, "transfer", page);
1304
1305 cl_page_completion(env, page, crt, rc);
1306
1307 RETURN(0);
1308}
1309
1310#define OSC_DUMP_GRANT(cli, fmt, args...) do { \
1311 struct client_obd *__tmp = (cli); \
1312 CDEBUG(D_CACHE, "%s: { dirty: %ld/%ld dirty_pages: %d/%d " \
1313 "unstable_pages: %d/%d dropped: %ld avail: %ld, " \
1314 "reserved: %ld, flight: %d } " fmt, \
1315 __tmp->cl_import->imp_obd->obd_name, \
1316 __tmp->cl_dirty, __tmp->cl_dirty_max, \
1317 atomic_read(&obd_dirty_pages), obd_max_dirty_pages, \
1318 atomic_read(&obd_unstable_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); \
1321} while (0)
1322
1323/* caller must hold loi_list_lock */
1324static void osc_consume_write_grant(struct client_obd *cli,
1325 struct brw_page *pga)
1326{
1327 LASSERT(spin_is_locked(&cli->cl_loi_list_lock.lock));
1328 LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
1329 atomic_inc(&obd_dirty_pages);
1330 cli->cl_dirty += PAGE_CACHE_SIZE;
1331 pga->flag |= OBD_BRW_FROM_GRANT;
1332 CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
1333 PAGE_CACHE_SIZE, pga, pga->pg);
1334 osc_update_next_shrink(cli);
1335}
1336
1337/* the companion to osc_consume_write_grant, called when a brw has completed.
1338 * must be called with the loi lock held. */
1339static void osc_release_write_grant(struct client_obd *cli,
1340 struct brw_page *pga)
1341{
1342 ENTRY;
1343
1344 LASSERT(spin_is_locked(&cli->cl_loi_list_lock.lock));
1345 if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
1346 EXIT;
1347 return;
1348 }
1349
1350 pga->flag &= ~OBD_BRW_FROM_GRANT;
1351 atomic_dec(&obd_dirty_pages);
1352 cli->cl_dirty -= PAGE_CACHE_SIZE;
1353 if (pga->flag & OBD_BRW_NOCACHE) {
1354 pga->flag &= ~OBD_BRW_NOCACHE;
1355 atomic_dec(&obd_dirty_transit_pages);
1356 cli->cl_dirty_transit -= PAGE_CACHE_SIZE;
1357 }
1358 EXIT;
1359}
1360
1361/**
1362 * To avoid sleeping with object lock held, it's good for us allocate enough
1363 * grants before entering into critical section.
1364 *
1365 * client_obd_list_lock held by caller
1366 */
1367static int osc_reserve_grant(struct client_obd *cli, unsigned int bytes)
1368{
1369 int rc = -EDQUOT;
1370
1371 if (cli->cl_avail_grant >= bytes) {
1372 cli->cl_avail_grant -= bytes;
1373 cli->cl_reserved_grant += bytes;
1374 rc = 0;
1375 }
1376 return rc;
1377}
1378
1379static void __osc_unreserve_grant(struct client_obd *cli,
1380 unsigned int reserved, unsigned int unused)
1381{
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;
1390 } else {
1391 cli->cl_avail_grant += unused;
1392 }
1393}
1394
1395void osc_unreserve_grant(struct client_obd *cli,
1396 unsigned int reserved, unsigned int unused)
1397{
1398 client_obd_list_lock(&cli->cl_loi_list_lock);
1399 __osc_unreserve_grant(cli, reserved, unused);
1400 if (unused > 0)
1401 osc_wake_cache_waiters(cli);
1402 client_obd_list_unlock(&cli->cl_loi_list_lock);
1403}
1404
1405/**
1406 * Free grant after IO is finished or canceled.
1407 *
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
1410 * can be lost:
1411 * 1. truncate;
1412 * 2. blocksize at OST is less than PAGE_CACHE_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.
1417 */
1418static void osc_free_grant(struct client_obd *cli, unsigned int nr_pages,
1419 unsigned int lost_grant)
1420{
1421 int grant = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
1422
1423 client_obd_list_lock(&cli->cl_loi_list_lock);
1424 atomic_sub(nr_pages, &obd_dirty_pages);
1425 cli->cl_dirty -= nr_pages << PAGE_CACHE_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;
1432 }
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);
1438}
1439
1440/**
1441 * The companion to osc_enter_cache(), called when @oap is no longer part of
1442 * the dirty accounting due to error.
1443 */
1444static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
1445{
1446 client_obd_list_lock(&cli->cl_loi_list_lock);
1447 osc_release_write_grant(cli, &oap->oap_brw_page);
1448 client_obd_list_unlock(&cli->cl_loi_list_lock);
1449}
1450
1451/**
1452 * Non-blocking version of osc_enter_cache() that consumes grant only when it
1453 * is available.
1454 */
1455static int osc_enter_cache_try(struct client_obd *cli,
1456 struct osc_async_page *oap,
1457 int bytes, int transient)
1458{
1459 int rc;
1460
1461 OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
1462
1463 rc = osc_reserve_grant(cli, bytes);
1464 if (rc < 0)
1465 return 0;
1466
1467 if (cli->cl_dirty + PAGE_CACHE_SIZE <= cli->cl_dirty_max &&
1468 atomic_read(&obd_unstable_pages) + 1 +
1469 atomic_read(&obd_dirty_pages) <= obd_max_dirty_pages) {
1470 osc_consume_write_grant(cli, &oap->oap_brw_page);
1471 if (transient) {
1472 cli->cl_dirty_transit += PAGE_CACHE_SIZE;
1473 atomic_inc(&obd_dirty_transit_pages);
1474 oap->oap_brw_flags |= OBD_BRW_NOCACHE;
1475 }
1476 rc = 1;
1477 } else {
1478 __osc_unreserve_grant(cli, bytes, bytes);
1479 rc = 0;
1480 }
1481 return rc;
1482}
1483
1484static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
1485{
1486 int rc;
1487 client_obd_list_lock(&cli->cl_loi_list_lock);
1488 rc = list_empty(&ocw->ocw_entry);
1489 client_obd_list_unlock(&cli->cl_loi_list_lock);
1490 return rc;
1491}
1492
1493/**
1494 * The main entry to reserve dirty page accounting. Usually the grant reserved
1495 * in this function will be freed in bulk in osc_free_grant() unless it fails
1496 * to add osc cache, in that case, it will be freed in osc_exit_cache().
1497 *
1498 * The process will be put into sleep if it's already run out of grant.
1499 */
1500static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
1501 struct osc_async_page *oap, int bytes)
1502{
1503 struct osc_object *osc = oap->oap_obj;
1504 struct lov_oinfo *loi = osc->oo_oinfo;
1505 struct osc_cache_waiter ocw;
1506 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1507 int rc = -EDQUOT;
1508 ENTRY;
1509
1510 OSC_DUMP_GRANT(cli, "need:%d.\n", bytes);
1511
1512 client_obd_list_lock(&cli->cl_loi_list_lock);
1513
1514 /* force the caller to try sync io. this can jump the list
1515 * of queued writes and create a discontiguous rpc stream */
1516 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_NO_GRANT) ||
1517 cli->cl_dirty_max < PAGE_CACHE_SIZE ||
1518 cli->cl_ar.ar_force_sync || loi->loi_ar.ar_force_sync)
1519 GOTO(out, rc = -EDQUOT);
1520
1521 /* Hopefully normal case - cache space and write credits available */
1522 if (osc_enter_cache_try(cli, oap, bytes, 0))
1523 GOTO(out, rc = 0);
1524
1525 /* We can get here for two reasons: too many dirty pages in cache, or
1526 * run out of grants. In both cases we should write dirty pages out.
1527 * Adding a cache waiter will trigger urgent write-out no matter what
1528 * RPC size will be.
1529 * The exiting condition is no avail grants and no dirty pages caching,
1530 * that really means there is no space on the OST. */
1531 init_waitqueue_head(&ocw.ocw_waitq);
1532 ocw.ocw_oap = oap;
1533 ocw.ocw_grant = bytes;
1534 while (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) {
1535 list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
1536 ocw.ocw_rc = 0;
1537 client_obd_list_unlock(&cli->cl_loi_list_lock);
1538
1539 osc_io_unplug_async(env, cli, NULL);
1540
1541 CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
1542 cli->cl_import->imp_obd->obd_name, &ocw, oap);
1543
1544 rc = l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
1545
1546 client_obd_list_lock(&cli->cl_loi_list_lock);
1547
1548 /* l_wait_event is interrupted by signal */
1549 if (rc < 0) {
1550 list_del_init(&ocw.ocw_entry);
1551 GOTO(out, rc);
1552 }
1553
1554 LASSERT(list_empty(&ocw.ocw_entry));
1555 rc = ocw.ocw_rc;
1556
1557 if (rc != -EDQUOT)
1558 GOTO(out, rc);
1559 if (osc_enter_cache_try(cli, oap, bytes, 0))
1560 GOTO(out, rc = 0);
1561 }
1562 EXIT;
1563out:
1564 client_obd_list_unlock(&cli->cl_loi_list_lock);
1565 OSC_DUMP_GRANT(cli, "returned %d.\n", rc);
1566 RETURN(rc);
1567}
1568
1569/* caller must hold loi_list_lock */
1570void osc_wake_cache_waiters(struct client_obd *cli)
1571{
1572 struct list_head *l, *tmp;
1573 struct osc_cache_waiter *ocw;
1574
1575 ENTRY;
1576 list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
1577 ocw = list_entry(l, struct osc_cache_waiter, ocw_entry);
1578 list_del_init(&ocw->ocw_entry);
1579
1580 ocw->ocw_rc = -EDQUOT;
1581 /* we can't dirty more */
1582 if (cli->cl_dirty + PAGE_CACHE_SIZE > cli->cl_dirty_max ||
1583 atomic_read(&obd_unstable_pages) + 1 +
1584 atomic_read(&obd_dirty_pages) > obd_max_dirty_pages) {
1585 CDEBUG(D_CACHE, "no dirty room: dirty: %ld "
1586 "osc max %ld, sys max %d\n", cli->cl_dirty,
1587 cli->cl_dirty_max, obd_max_dirty_pages);
1588 goto wakeup;
1589 }
1590
1591 ocw->ocw_rc = 0;
1592 if (!osc_enter_cache_try(cli, ocw->ocw_oap, ocw->ocw_grant, 0))
1593 ocw->ocw_rc = -EDQUOT;
1594
1595wakeup:
1596 CDEBUG(D_CACHE, "wake up %p for oap %p, avail grant %ld, %d\n",
1597 ocw, ocw->ocw_oap, cli->cl_avail_grant, ocw->ocw_rc);
1598
1599 wake_up(&ocw->ocw_waitq);
1600 }
1601
1602 EXIT;
1603}
1604
1605static int osc_max_rpc_in_flight(struct client_obd *cli, struct osc_object *osc)
1606{
1607 int hprpc = !!list_empty(&osc->oo_hp_exts);
1608 return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
1609}
1610
1611/* This maintains the lists of pending pages to read/write for a given object
1612 * (lop). This is used by osc_check_rpcs->osc_next_obj() and osc_list_maint()
1613 * to quickly find objects that are ready to send an RPC. */
1614static int osc_makes_rpc(struct client_obd *cli, struct osc_object *osc,
1615 int cmd)
1616{
1617 int invalid_import = 0;
1618 ENTRY;
1619
1620 /* if we have an invalid import we want to drain the queued pages
1621 * by forcing them through rpcs that immediately fail and complete
1622 * the pages. recovery relies on this to empty the queued pages
1623 * before canceling the locks and evicting down the llite pages */
1624 if ((cli->cl_import == NULL || cli->cl_import->imp_invalid))
1625 invalid_import = 1;
1626
1627 if (cmd & OBD_BRW_WRITE) {
1628 if (atomic_read(&osc->oo_nr_writes) == 0)
1629 RETURN(0);
1630 if (invalid_import) {
1631 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1632 RETURN(1);
1633 }
1634 if (!list_empty(&osc->oo_hp_exts)) {
1635 CDEBUG(D_CACHE, "high prio request forcing RPC\n");
1636 RETURN(1);
1637 }
1638 if (!list_empty(&osc->oo_urgent_exts)) {
1639 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1640 RETURN(1);
1641 }
1642 /* trigger a write rpc stream as long as there are dirtiers
1643 * waiting for space. as they're waiting, they're not going to
1644 * create more pages to coalesce with what's waiting.. */
1645 if (!list_empty(&cli->cl_cache_waiters)) {
1646 CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1647 RETURN(1);
1648 }
1649 if (atomic_read(&osc->oo_nr_writes) >=
1650 cli->cl_max_pages_per_rpc)
1651 RETURN(1);
1652 } else {
1653 if (atomic_read(&osc->oo_nr_reads) == 0)
1654 RETURN(0);
1655 if (invalid_import) {
1656 CDEBUG(D_CACHE, "invalid import forcing RPC\n");
1657 RETURN(1);
1658 }
1659 /* all read are urgent. */
1660 if (!list_empty(&osc->oo_reading_exts))
1661 RETURN(1);
1662 }
1663
1664 RETURN(0);
1665}
1666
1667static void osc_update_pending(struct osc_object *obj, int cmd, int delta)
1668{
1669 struct client_obd *cli = osc_cli(obj);
1670 if (cmd & OBD_BRW_WRITE) {
1671 atomic_add(delta, &obj->oo_nr_writes);
1672 atomic_add(delta, &cli->cl_pending_w_pages);
1673 LASSERT(atomic_read(&obj->oo_nr_writes) >= 0);
1674 } else {
1675 atomic_add(delta, &obj->oo_nr_reads);
1676 atomic_add(delta, &cli->cl_pending_r_pages);
1677 LASSERT(atomic_read(&obj->oo_nr_reads) >= 0);
1678 }
1679 OSC_IO_DEBUG(obj, "update pending cmd %d delta %d.\n", cmd, delta);
1680}
1681
1682static int osc_makes_hprpc(struct osc_object *obj)
1683{
1684 return !list_empty(&obj->oo_hp_exts);
1685}
1686
1687static void on_list(struct list_head *item, struct list_head *list, int should_be_on)
1688{
1689 if (list_empty(item) && should_be_on)
1690 list_add_tail(item, list);
1691 else if (!list_empty(item) && !should_be_on)
1692 list_del_init(item);
1693}
1694
1695/* maintain the osc's cli list membership invariants so that osc_send_oap_rpc
1696 * can find pages to build into rpcs quickly */
1697static int __osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1698{
1699 if (osc_makes_hprpc(osc)) {
1700 /* HP rpc */
1701 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list, 0);
1702 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
1703 } else {
1704 on_list(&osc->oo_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
1705 on_list(&osc->oo_ready_item, &cli->cl_loi_ready_list,
1706 osc_makes_rpc(cli, osc, OBD_BRW_WRITE) ||
1707 osc_makes_rpc(cli, osc, OBD_BRW_READ));
1708 }
1709
1710 on_list(&osc->oo_write_item, &cli->cl_loi_write_list,
1711 atomic_read(&osc->oo_nr_writes) > 0);
1712
1713 on_list(&osc->oo_read_item, &cli->cl_loi_read_list,
1714 atomic_read(&osc->oo_nr_reads) > 0);
1715
1716 return osc_is_ready(osc);
1717}
1718
1719static int osc_list_maint(struct client_obd *cli, struct osc_object *osc)
1720{
1721 int is_ready;
1722
1723 client_obd_list_lock(&cli->cl_loi_list_lock);
1724 is_ready = __osc_list_maint(cli, osc);
1725 client_obd_list_unlock(&cli->cl_loi_list_lock);
1726
1727 return is_ready;
1728}
1729
1730/* this is trying to propogate async writeback errors back up to the
1731 * application. As an async write fails we record the error code for later if
1732 * the app does an fsync. As long as errors persist we force future rpcs to be
1733 * sync so that the app can get a sync error and break the cycle of queueing
1734 * pages for which writeback will fail. */
1735static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
1736 int rc)
1737{
1738 if (rc) {
1739 if (!ar->ar_rc)
1740 ar->ar_rc = rc;
1741
1742 ar->ar_force_sync = 1;
1743 ar->ar_min_xid = ptlrpc_sample_next_xid();
1744 return;
1745
1746 }
1747
1748 if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
1749 ar->ar_force_sync = 0;
1750}
1751
1752/* Performs "unstable" page accounting. This function balances the
1753 * increment operations performed in osc_inc_unstable_pages. It is
1754 * registered as the RPC request callback, and is executed when the
1755 * bulk RPC is committed on the server. Thus at this point, the pages
1756 * involved in the bulk transfer are no longer considered unstable. */
1757void osc_dec_unstable_pages(struct ptlrpc_request *req)
1758{
1759 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
1760 struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
1761 obd_count page_count = desc->bd_iov_count;
1762 int i;
1763
1764 /* No unstable page tracking */
1765 if (cli->cl_cache == NULL)
1766 return;
1767
1768 LASSERT(page_count >= 0);
1769
1770 for (i = 0; i < page_count; i++)
1771 dec_zone_page_state(desc->bd_iov[i].kiov_page, NR_UNSTABLE_NFS);
1772
1773 atomic_sub(page_count, &cli->cl_cache->ccc_unstable_nr);
1774 LASSERT(atomic_read(&cli->cl_cache->ccc_unstable_nr) >= 0);
1775
1776 atomic_sub(page_count, &obd_unstable_pages);
1777 LASSERT(atomic_read(&obd_unstable_pages) >= 0);
1778
1779 spin_lock(&req->rq_lock);
1780 req->rq_committed = 1;
1781 req->rq_unstable = 0;
1782 spin_unlock(&req->rq_lock);
1783
1784 wake_up_all(&cli->cl_cache->ccc_unstable_waitq);
1785}
1786
1787/* "unstable" page accounting. See: osc_dec_unstable_pages. */
1788void osc_inc_unstable_pages(struct ptlrpc_request *req)
1789{
1790 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
1791 struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
1792 obd_count page_count = desc->bd_iov_count;
1793 int i;
1794
1795 /* No unstable page tracking */
1796 if (cli->cl_cache == NULL)
1797 return;
1798
1799 LASSERT(page_count >= 0);
1800
1801 for (i = 0; i < page_count; i++)
1802 inc_zone_page_state(desc->bd_iov[i].kiov_page, NR_UNSTABLE_NFS);
1803
1804 LASSERT(atomic_read(&cli->cl_cache->ccc_unstable_nr) >= 0);
1805 atomic_add(page_count, &cli->cl_cache->ccc_unstable_nr);
1806
1807 LASSERT(atomic_read(&obd_unstable_pages) >= 0);
1808 atomic_add(page_count, &obd_unstable_pages);
1809
1810 spin_lock(&req->rq_lock);
1811
1812 /* If the request has already been committed (i.e. brw_commit
1813 * called via rq_commit_cb), we need to undo the unstable page
1814 * increments we just performed because rq_commit_cb wont be
1815 * called again. Otherwise, just set the commit callback so the
1816 * unstable page accounting is properly updated when the request
1817 * is committed */
1818 if (req->rq_committed) {
1819 /* Drop lock before calling osc_dec_unstable_pages */
1820 spin_unlock(&req->rq_lock);
1821 osc_dec_unstable_pages(req);
1822 spin_lock(&req->rq_lock);
1823 } else {
1824 req->rq_unstable = 1;
1825 req->rq_commit_cb = osc_dec_unstable_pages;
1826 }
1827
1828 spin_unlock(&req->rq_lock);
1829}
1830
1831/* this must be called holding the loi list lock to give coverage to exit_cache,
1832 * async_flag maintenance, and oap_request */
1833static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
1834 struct osc_async_page *oap, int sent, int rc)
1835{
1836 struct osc_object *osc = oap->oap_obj;
1837 struct lov_oinfo *loi = osc->oo_oinfo;
1838 __u64 xid = 0;
1839
1840 ENTRY;
1841 if (oap->oap_request != NULL) {
1842 if (rc == 0)
1843 osc_inc_unstable_pages(oap->oap_request);
1844
1845 xid = ptlrpc_req_xid(oap->oap_request);
1846 ptlrpc_req_finished(oap->oap_request);
1847 oap->oap_request = NULL;
1848 }
1849
1850 /* As the transfer for this page is being done, clear the flags */
1851 spin_lock(&oap->oap_lock);
1852 oap->oap_async_flags = 0;
1853 spin_unlock(&oap->oap_lock);
1854 oap->oap_interrupted = 0;
1855
1856 if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
1857 client_obd_list_lock(&cli->cl_loi_list_lock);
1858 osc_process_ar(&cli->cl_ar, xid, rc);
1859 osc_process_ar(&loi->loi_ar, xid, rc);
1860 client_obd_list_unlock(&cli->cl_loi_list_lock);
1861 }
1862
1863 rc = osc_completion(env, oap, oap->oap_cmd, rc);
1864 if (rc)
1865 CERROR("completion on oap %p obj %p returns %d.\n",
1866 oap, osc, rc);
1867
1868 EXIT;
1869}
1870
1871/**
1872 * Try to add extent to one RPC. We need to think about the following things:
1873 * - # of pages must not be over max_pages_per_rpc
1874 * - extent must be compatible with previous ones
1875 */
1876static int try_to_add_extent_for_io(struct client_obd *cli,
1877 struct osc_extent *ext, struct list_head *rpclist,
1878 int *pc, unsigned int *max_pages)
1879{
1880 struct osc_extent *tmp;
1881 ENTRY;
1882
1883 EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
1884 ext);
1885
1886 *max_pages = max(ext->oe_mppr, *max_pages);
1887 if (*pc + ext->oe_nr_pages > *max_pages)
1888 RETURN(0);
1889
1890 list_for_each_entry(tmp, rpclist, oe_link) {
1891 EASSERT(tmp->oe_owner == current, tmp);
1892#if 0
1893 if (overlapped(tmp, ext)) {
1894 OSC_EXTENT_DUMP(D_ERROR, tmp, "overlapped %p.\n", ext);
1895 EASSERT(0, ext);
1896 }
1897#endif
1898
1899 if (tmp->oe_srvlock != ext->oe_srvlock ||
1900 !tmp->oe_grants != !ext->oe_grants)
1901 RETURN(0);
1902
1903 /* remove break for strict check */
1904 break;
1905 }
1906
1907 *pc += ext->oe_nr_pages;
1908 list_move_tail(&ext->oe_link, rpclist);
1909 ext->oe_owner = current;
1910 RETURN(1);
1911}
1912
1913/**
1914 * In order to prevent multiple ptlrpcd from breaking contiguous extents,
1915 * get_write_extent() takes all appropriate extents in atomic.
1916 *
1917 * The following policy is used to collect extents for IO:
1918 * 1. Add as many HP extents as possible;
1919 * 2. Add the first urgent extent in urgent extent list and take it out of
1920 * urgent list;
1921 * 3. Add subsequent extents of this urgent extent;
1922 * 4. If urgent list is not empty, goto 2;
1923 * 5. Traverse the extent tree from the 1st extent;
1924 * 6. Above steps exit if there is no space in this RPC.
1925 */
1926static int get_write_extents(struct osc_object *obj, struct list_head *rpclist)
1927{
1928 struct client_obd *cli = osc_cli(obj);
1929 struct osc_extent *ext;
1930 int page_count = 0;
1931 unsigned int max_pages = cli->cl_max_pages_per_rpc;
1932
1933 LASSERT(osc_object_is_locked(obj));
1934 while (!list_empty(&obj->oo_hp_exts)) {
1935 ext = list_entry(obj->oo_hp_exts.next, struct osc_extent,
1936 oe_link);
1937 LASSERT(ext->oe_state == OES_CACHE);
1938 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1939 &max_pages))
1940 return page_count;
1941 EASSERT(ext->oe_nr_pages <= max_pages, ext);
1942 }
1943 if (page_count == max_pages)
1944 return page_count;
1945
1946 while (!list_empty(&obj->oo_urgent_exts)) {
1947 ext = list_entry(obj->oo_urgent_exts.next,
1948 struct osc_extent, oe_link);
1949 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1950 &max_pages))
1951 return page_count;
1952
1953 if (!ext->oe_intree)
1954 continue;
1955
1956 while ((ext = next_extent(ext)) != NULL) {
1957 if ((ext->oe_state != OES_CACHE) ||
1958 (!list_empty(&ext->oe_link) &&
1959 ext->oe_owner != NULL))
1960 continue;
1961
1962 if (!try_to_add_extent_for_io(cli, ext, rpclist,
1963 &page_count, &max_pages))
1964 return page_count;
1965 }
1966 }
1967 if (page_count == max_pages)
1968 return page_count;
1969
1970 ext = first_extent(obj);
1971 while (ext != NULL) {
1972 if ((ext->oe_state != OES_CACHE) ||
1973 /* this extent may be already in current rpclist */
1974 (!list_empty(&ext->oe_link) && ext->oe_owner != NULL)) {
1975 ext = next_extent(ext);
1976 continue;
1977 }
1978
1979 if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
1980 &max_pages))
1981 return page_count;
1982
1983 ext = next_extent(ext);
1984 }
1985 return page_count;
1986}
1987
1988static int
1989osc_send_write_rpc(const struct lu_env *env, struct client_obd *cli,
1990 struct osc_object *osc, pdl_policy_t pol)
1991{
1992 LIST_HEAD(rpclist);
1993 struct osc_extent *ext;
1994 struct osc_extent *tmp;
1995 struct osc_extent *first = NULL;
1996 obd_count page_count = 0;
1997 int srvlock = 0;
1998 int rc = 0;
1999 ENTRY;
2000
2001 LASSERT(osc_object_is_locked(osc));
2002
2003 page_count = get_write_extents(osc, &rpclist);
2004 LASSERT(equi(page_count == 0, list_empty(&rpclist)));
2005
2006 if (list_empty(&rpclist))
2007 RETURN(0);
2008
2009 osc_update_pending(osc, OBD_BRW_WRITE, -page_count);
2010
2011 list_for_each_entry(ext, &rpclist, oe_link) {
2012 LASSERT(ext->oe_state == OES_CACHE ||
2013 ext->oe_state == OES_LOCK_DONE);
2014 if (ext->oe_state == OES_CACHE)
2015 osc_extent_state_set(ext, OES_LOCKING);
2016 else
2017 osc_extent_state_set(ext, OES_RPC);
2018 }
2019
2020 /* we're going to grab page lock, so release object lock because
2021 * lock order is page lock -> object lock. */
2022 osc_object_unlock(osc);
2023
2024 list_for_each_entry_safe(ext, tmp, &rpclist, oe_link) {
2025 if (ext->oe_state == OES_LOCKING) {
2026 rc = osc_extent_make_ready(env, ext);
2027 if (unlikely(rc < 0)) {
2028 list_del_init(&ext->oe_link);
2029 osc_extent_finish(env, ext, 0, rc);
2030 continue;
2031 }
2032 }
2033 if (first == NULL) {
2034 first = ext;
2035 srvlock = ext->oe_srvlock;
2036 } else {
2037 LASSERT(srvlock == ext->oe_srvlock);
2038 }
2039 }
2040
2041 if (!list_empty(&rpclist)) {
2042 LASSERT(page_count > 0);
2043 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_WRITE, pol);
2044 LASSERT(list_empty(&rpclist));
2045 }
2046
2047 osc_object_lock(osc);
2048 RETURN(rc);
2049}
2050
2051/**
2052 * prepare pages for ASYNC io and put pages in send queue.
2053 *
2054 * \param cmd OBD_BRW_* macroses
2055 * \param lop pending pages
2056 *
2057 * \return zero if no page added to send queue.
2058 * \return 1 if pages successfully added to send queue.
2059 * \return negative on errors.
2060 */
2061static int
2062osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
2063 struct osc_object *osc, pdl_policy_t pol)
2064{
2065 struct osc_extent *ext;
2066 struct osc_extent *next;
2067 LIST_HEAD(rpclist);
2068 int page_count = 0;
2069 unsigned int max_pages = cli->cl_max_pages_per_rpc;
2070 int rc = 0;
2071 ENTRY;
2072
2073 LASSERT(osc_object_is_locked(osc));
2074 list_for_each_entry_safe(ext, next,
2075 &osc->oo_reading_exts, oe_link) {
2076 EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
2077 if (!try_to_add_extent_for_io(cli, ext, &rpclist, &page_count,
2078 &max_pages))
2079 break;
2080 osc_extent_state_set(ext, OES_RPC);
2081 EASSERT(ext->oe_nr_pages <= max_pages, ext);
2082 }
2083 LASSERT(page_count <= max_pages);
2084
2085 osc_update_pending(osc, OBD_BRW_READ, -page_count);
2086
2087 if (!list_empty(&rpclist)) {
2088 osc_object_unlock(osc);
2089
2090 LASSERT(page_count > 0);
2091 rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ, pol);
2092 LASSERT(list_empty(&rpclist));
2093
2094 osc_object_lock(osc);
2095 }
2096 RETURN(rc);
2097}
2098
2099#define list_to_obj(list, item) ({ \
2100 struct list_head *__tmp = (list)->next; \
2101 list_del_init(__tmp); \
2102 list_entry(__tmp, struct osc_object, oo_##item); \
2103})
2104
2105/* This is called by osc_check_rpcs() to find which objects have pages that
2106 * we could be sending. These lists are maintained by osc_makes_rpc(). */
2107static struct osc_object *osc_next_obj(struct client_obd *cli)
2108{
2109 ENTRY;
2110
2111 /* First return objects that have blocked locks so that they
2112 * will be flushed quickly and other clients can get the lock,
2113 * then objects which have pages ready to be stuffed into RPCs */
2114 if (!list_empty(&cli->cl_loi_hp_ready_list))
2115 RETURN(list_to_obj(&cli->cl_loi_hp_ready_list, hp_ready_item));
2116 if (!list_empty(&cli->cl_loi_ready_list))
2117 RETURN(list_to_obj(&cli->cl_loi_ready_list, ready_item));
2118
2119 /* then if we have cache waiters, return all objects with queued
2120 * writes. This is especially important when many small files
2121 * have filled up the cache and not been fired into rpcs because
2122 * they don't pass the nr_pending/object threshhold */
2123 if (!list_empty(&cli->cl_cache_waiters) &&
2124 !list_empty(&cli->cl_loi_write_list))
2125 RETURN(list_to_obj(&cli->cl_loi_write_list, write_item));
2126
2127 /* then return all queued objects when we have an invalid import
2128 * so that they get flushed */
2129 if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2130 if (!list_empty(&cli->cl_loi_write_list))
2131 RETURN(list_to_obj(&cli->cl_loi_write_list,
2132 write_item));
2133 if (!list_empty(&cli->cl_loi_read_list))
2134 RETURN(list_to_obj(&cli->cl_loi_read_list,
2135 read_item));
2136 }
2137 RETURN(NULL);
2138}
2139
2140/* called with the loi list lock held */
2141static void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli,
2142 pdl_policy_t pol)
2143{
2144 struct osc_object *osc;
2145 int rc = 0;
2146 ENTRY;
2147
2148 while ((osc = osc_next_obj(cli)) != NULL) {
2149 struct cl_object *obj = osc2cl(osc);
2150 struct lu_ref_link *link;
2151
2152 OSC_IO_DEBUG(osc, "%lu in flight\n", rpcs_in_flight(cli));
2153
2154 if (osc_max_rpc_in_flight(cli, osc)) {
2155 __osc_list_maint(cli, osc);
2156 break;
2157 }
2158
2159 cl_object_get(obj);
2160 client_obd_list_unlock(&cli->cl_loi_list_lock);
2161 link = lu_object_ref_add(&obj->co_lu, "check", current);
2162
2163 /* attempt some read/write balancing by alternating between
2164 * reads and writes in an object. The makes_rpc checks here
2165 * would be redundant if we were getting read/write work items
2166 * instead of objects. we don't want send_oap_rpc to drain a
2167 * partial read pending queue when we're given this object to
2168 * do io on writes while there are cache waiters */
2169 osc_object_lock(osc);
2170 if (osc_makes_rpc(cli, osc, OBD_BRW_WRITE)) {
2171 rc = osc_send_write_rpc(env, cli, osc, pol);
2172 if (rc < 0) {
2173 CERROR("Write request failed with %d\n", rc);
2174
2175 /* osc_send_write_rpc failed, mostly because of
2176 * memory pressure.
2177 *
2178 * It can't break here, because if:
2179 * - a page was submitted by osc_io_submit, so
2180 * page locked;
2181 * - no request in flight
2182 * - no subsequent request
2183 * The system will be in live-lock state,
2184 * because there is no chance to call
2185 * osc_io_unplug() and osc_check_rpcs() any
2186 * more. pdflush can't help in this case,
2187 * because it might be blocked at grabbing
2188 * the page lock as we mentioned.
2189 *
2190 * Anyway, continue to drain pages. */
2191 /* break; */
2192 }
2193 }
2194 if (osc_makes_rpc(cli, osc, OBD_BRW_READ)) {
2195 rc = osc_send_read_rpc(env, cli, osc, pol);
2196 if (rc < 0)
2197 CERROR("Read request failed with %d\n", rc);
2198 }
2199 osc_object_unlock(osc);
2200
2201 osc_list_maint(cli, osc);
2202 lu_object_ref_del_at(&obj->co_lu, link, "check", current);
2203 cl_object_put(env, obj);
2204
2205 client_obd_list_lock(&cli->cl_loi_list_lock);
2206 }
2207}
2208
2209static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
2210 struct osc_object *osc, pdl_policy_t pol, int async)
2211{
2212 int has_rpcs = 1;
2213 int rc = 0;
2214
2215 client_obd_list_lock(&cli->cl_loi_list_lock);
2216 if (osc != NULL)
2217 has_rpcs = __osc_list_maint(cli, osc);
2218 if (has_rpcs) {
2219 if (!async) {
2220 /* disable osc_lru_shrink() temporarily to avoid
2221 * potential stack overrun problem. LU-2859 */
2222 atomic_inc(&cli->cl_lru_shrinkers);
2223 osc_check_rpcs(env, cli, pol);
2224 atomic_dec(&cli->cl_lru_shrinkers);
2225 } else {
2226 CDEBUG(D_CACHE, "Queue writeback work for client %p.\n",
2227 cli);
2228 LASSERT(cli->cl_writeback_work != NULL);
2229 rc = ptlrpcd_queue_work(cli->cl_writeback_work);
2230 }
2231 }
2232 client_obd_list_unlock(&cli->cl_loi_list_lock);
2233 return rc;
2234}
2235
2236static int osc_io_unplug_async(const struct lu_env *env,
2237 struct client_obd *cli, struct osc_object *osc)
2238{
2239 /* XXX: policy is no use actually. */
2240 return osc_io_unplug0(env, cli, osc, PDL_POLICY_ROUND, 1);
2241}
2242
2243void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
2244 struct osc_object *osc, pdl_policy_t pol)
2245{
2246 (void)osc_io_unplug0(env, cli, osc, pol, 0);
2247}
2248
2249int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
2250 struct page *page, loff_t offset)
2251{
2252 struct obd_export *exp = osc_export(osc);
2253 struct osc_async_page *oap = &ops->ops_oap;
2254 ENTRY;
2255
2256 if (!page)
2257 return cfs_size_round(sizeof(*oap));
2258
2259 oap->oap_magic = OAP_MAGIC;
2260 oap->oap_cli = &exp->exp_obd->u.cli;
2261 oap->oap_obj = osc;
2262
2263 oap->oap_page = page;
2264 oap->oap_obj_off = offset;
2265 LASSERT(!(offset & ~CFS_PAGE_MASK));
2266
2267 if (!client_is_remote(exp) && cfs_capable(CFS_CAP_SYS_RESOURCE))
2268 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2269
2270 INIT_LIST_HEAD(&oap->oap_pending_item);
2271 INIT_LIST_HEAD(&oap->oap_rpc_item);
2272
2273 spin_lock_init(&oap->oap_lock);
2274 CDEBUG(D_INFO, "oap %p page %p obj off "LPU64"\n",
2275 oap, page, oap->oap_obj_off);
2276 RETURN(0);
2277}
2278
2279int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
2280 struct osc_page *ops)
2281{
2282 struct osc_io *oio = osc_env_io(env);
2283 struct osc_extent *ext = NULL;
2284 struct osc_async_page *oap = &ops->ops_oap;
2285 struct client_obd *cli = oap->oap_cli;
2286 struct osc_object *osc = oap->oap_obj;
2287 pgoff_t index;
2288 int grants = 0;
2289 int brw_flags = OBD_BRW_ASYNC;
2290 int cmd = OBD_BRW_WRITE;
2291 int need_release = 0;
2292 int rc = 0;
2293 ENTRY;
2294
2295 if (oap->oap_magic != OAP_MAGIC)
2296 RETURN(-EINVAL);
2297
2298 if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2299 RETURN(-EIO);
2300
2301 if (!list_empty(&oap->oap_pending_item) ||
2302 !list_empty(&oap->oap_rpc_item))
2303 RETURN(-EBUSY);
2304
2305 /* Set the OBD_BRW_SRVLOCK before the page is queued. */
2306 brw_flags |= ops->ops_srvlock ? OBD_BRW_SRVLOCK : 0;
2307 if (!client_is_remote(osc_export(osc)) &&
2308 cfs_capable(CFS_CAP_SYS_RESOURCE)) {
2309 brw_flags |= OBD_BRW_NOQUOTA;
2310 cmd |= OBD_BRW_NOQUOTA;
2311 }
2312
2313 /* check if the file's owner/group is over quota */
2314 if (!(cmd & OBD_BRW_NOQUOTA)) {
2315 struct cl_object *obj;
2316 struct cl_attr *attr;
2317 unsigned int qid[MAXQUOTAS];
2318
2319 obj = cl_object_top(&osc->oo_cl);
2320 attr = &osc_env_info(env)->oti_attr;
2321
2322 cl_object_attr_lock(obj);
2323 rc = cl_object_attr_get(env, obj, attr);
2324 cl_object_attr_unlock(obj);
2325
2326 qid[USRQUOTA] = attr->cat_uid;
2327 qid[GRPQUOTA] = attr->cat_gid;
2328 if (rc == 0 && osc_quota_chkdq(cli, qid) == NO_QUOTA)
2329 rc = -EDQUOT;
2330 if (rc)
2331 RETURN(rc);
2332 }
2333
2334 oap->oap_cmd = cmd;
2335 oap->oap_page_off = ops->ops_from;
2336 oap->oap_count = ops->ops_to - ops->ops_from;
2337 oap->oap_async_flags = 0;
2338 oap->oap_brw_flags = brw_flags;
2339
2340 OSC_IO_DEBUG(osc, "oap %p page %p added for cmd %d\n",
2341 oap, oap->oap_page, oap->oap_cmd & OBD_BRW_RWMASK);
2342
2343 index = oap2cl_page(oap)->cp_index;
2344
2345 /* Add this page into extent by the following steps:
2346 * 1. if there exists an active extent for this IO, mostly this page
2347 * can be added to the active extent and sometimes we need to
2348 * expand extent to accomodate this page;
2349 * 2. otherwise, a new extent will be allocated. */
2350
2351 ext = oio->oi_active;
2352 if (ext != NULL && ext->oe_start <= index && ext->oe_max_end >= index) {
2353 /* one chunk plus extent overhead must be enough to write this
2354 * page */
2355 grants = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
2356 if (ext->oe_end >= index)
2357 grants = 0;
2358
2359 /* it doesn't need any grant to dirty this page */
2360 client_obd_list_lock(&cli->cl_loi_list_lock);
2361 rc = osc_enter_cache_try(cli, oap, grants, 0);
2362 client_obd_list_unlock(&cli->cl_loi_list_lock);
2363 if (rc == 0) { /* try failed */
2364 grants = 0;
2365 need_release = 1;
2366 } else if (ext->oe_end < index) {
2367 int tmp = grants;
2368 /* try to expand this extent */
2369 rc = osc_extent_expand(ext, index, &tmp);
2370 if (rc < 0) {
2371 need_release = 1;
2372 /* don't free reserved grant */
2373 } else {
2374 OSC_EXTENT_DUMP(D_CACHE, ext,
2375 "expanded for %lu.\n", index);
2376 osc_unreserve_grant(cli, grants, tmp);
2377 grants = 0;
2378 }
2379 }
2380 rc = 0;
2381 } else if (ext != NULL) {
2382 /* index is located outside of active extent */
2383 need_release = 1;
2384 }
2385 if (need_release) {
2386 osc_extent_release(env, ext);
2387 oio->oi_active = NULL;
2388 ext = NULL;
2389 }
2390
2391 if (ext == NULL) {
2392 int tmp = (1 << cli->cl_chunkbits) + cli->cl_extent_tax;
2393
2394 /* try to find new extent to cover this page */
2395 LASSERT(oio->oi_active == NULL);
2396 /* we may have allocated grant for this page if we failed
2397 * to expand the previous active extent. */
2398 LASSERT(ergo(grants > 0, grants >= tmp));
2399
2400 rc = 0;
2401 if (grants == 0) {
2402 /* we haven't allocated grant for this page. */
2403 rc = osc_enter_cache(env, cli, oap, tmp);
2404 if (rc == 0)
2405 grants = tmp;
2406 }
2407
2408 tmp = grants;
2409 if (rc == 0) {
2410 ext = osc_extent_find(env, osc, index, &tmp);
2411 if (IS_ERR(ext)) {
2412 LASSERT(tmp == grants);
2413 osc_exit_cache(cli, oap);
2414 rc = PTR_ERR(ext);
2415 ext = NULL;
2416 } else {
2417 oio->oi_active = ext;
2418 }
2419 }
2420 if (grants > 0)
2421 osc_unreserve_grant(cli, grants, tmp);
2422 }
2423
2424 LASSERT(ergo(rc == 0, ext != NULL));
2425 if (ext != NULL) {
2426 EASSERTF(ext->oe_end >= index && ext->oe_start <= index,
2427 ext, "index = %lu.\n", index);
2428 LASSERT((oap->oap_brw_flags & OBD_BRW_FROM_GRANT) != 0);
2429
2430 osc_object_lock(osc);
2431 if (ext->oe_nr_pages == 0)
2432 ext->oe_srvlock = ops->ops_srvlock;
2433 else
2434 LASSERT(ext->oe_srvlock == ops->ops_srvlock);
2435 ++ext->oe_nr_pages;
2436 list_add_tail(&oap->oap_pending_item, &ext->oe_pages);
2437 osc_object_unlock(osc);
2438 }
2439 RETURN(rc);
2440}
2441
2442int osc_teardown_async_page(const struct lu_env *env,
2443 struct osc_object *obj, struct osc_page *ops)
2444{
2445 struct osc_async_page *oap = &ops->ops_oap;
2446 struct osc_extent *ext = NULL;
2447 int rc = 0;
2448 ENTRY;
2449
2450 LASSERT(oap->oap_magic == OAP_MAGIC);
2451
2452 CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
2453 oap, ops, oap2cl_page(oap)->cp_index);
2454
2455 osc_object_lock(obj);
2456 if (!list_empty(&oap->oap_rpc_item)) {
2457 CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
2458 rc = -EBUSY;
2459 } else if (!list_empty(&oap->oap_pending_item)) {
2460 ext = osc_extent_lookup(obj, oap2cl_page(oap)->cp_index);
2461 /* only truncated pages are allowed to be taken out.
2462 * See osc_extent_truncate() and osc_cache_truncate_start()
2463 * for details. */
2464 if (ext != NULL && ext->oe_state != OES_TRUNC) {
2465 OSC_EXTENT_DUMP(D_ERROR, ext, "trunc at %lu.\n",
2466 oap2cl_page(oap)->cp_index);
2467 rc = -EBUSY;
2468 }
2469 }
2470 osc_object_unlock(obj);
2471 if (ext != NULL)
2472 osc_extent_put(env, ext);
2473 RETURN(rc);
2474}
2475
2476/**
2477 * This is called when a page is picked up by kernel to write out.
2478 *
2479 * We should find out the corresponding extent and add the whole extent
2480 * into urgent list. The extent may be being truncated or used, handle it
2481 * carefully.
2482 */
2483int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
2484 struct osc_page *ops)
2485{
2486 struct osc_extent *ext = NULL;
2487 struct osc_object *obj = cl2osc(ops->ops_cl.cpl_obj);
2488 struct cl_page *cp = ops->ops_cl.cpl_page;
2489 pgoff_t index = cp->cp_index;
2490 struct osc_async_page *oap = &ops->ops_oap;
2491 bool unplug = false;
2492 int rc = 0;
2493 ENTRY;
2494
2495 osc_object_lock(obj);
2496 ext = osc_extent_lookup(obj, index);
2497 if (ext == NULL) {
2498 osc_extent_tree_dump(D_ERROR, obj);
2499 LASSERTF(0, "page index %lu is NOT covered.\n", index);
2500 }
2501
2502 switch (ext->oe_state) {
2503 case OES_RPC:
2504 case OES_LOCK_DONE:
2505 CL_PAGE_DEBUG(D_ERROR, env, cl_page_top(cp),
2506 "flush an in-rpc page?\n");
2507 LASSERT(0);
2508 break;
2509 case OES_LOCKING:
2510 /* If we know this extent is being written out, we should abort
2511 * so that the writer can make this page ready. Otherwise, there
2512 * exists a deadlock problem because other process can wait for
2513 * page writeback bit holding page lock; and meanwhile in
2514 * vvp_page_make_ready(), we need to grab page lock before
2515 * really sending the RPC. */
2516 case OES_TRUNC:
2517 /* race with truncate, page will be redirtied */
2518 GOTO(out, rc = -EAGAIN);
2519 default:
2520 break;
2521 }
2522
2523 rc = cl_page_prep(env, io, cl_page_top(cp), CRT_WRITE);
2524 if (rc)
2525 GOTO(out, rc);
2526
2527 spin_lock(&oap->oap_lock);
2528 oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
2529 spin_unlock(&oap->oap_lock);
2530
2531 if (memory_pressure_get())
2532 ext->oe_memalloc = 1;
2533
2534 ext->oe_urgent = 1;
2535 if (ext->oe_state == OES_CACHE) {
2536 OSC_EXTENT_DUMP(D_CACHE, ext,
2537 "flush page %p make it urgent.\n", oap);
2538 if (list_empty(&ext->oe_link))
2539 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2540 unplug = true;
2541 }
2542 rc = 0;
2543 EXIT;
2544
2545out:
2546 osc_object_unlock(obj);
2547 osc_extent_put(env, ext);
2548 if (unplug)
2549 osc_io_unplug_async(env, osc_cli(obj), obj);
2550 return rc;
2551}
2552
2553/**
2554 * this is called when a sync waiter receives an interruption. Its job is to
2555 * get the caller woken as soon as possible. If its page hasn't been put in an
2556 * rpc yet it can dequeue immediately. Otherwise it has to mark the rpc as
2557 * desiring interruption which will forcefully complete the rpc once the rpc
2558 * has timed out.
2559 */
2560int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops)
2561{
2562 struct osc_async_page *oap = &ops->ops_oap;
2563 struct osc_object *obj = oap->oap_obj;
2564 struct client_obd *cli = osc_cli(obj);
2565 struct osc_extent *ext;
2566 struct osc_extent *found = NULL;
2567 struct list_head *plist;
2568 pgoff_t index = oap2cl_page(oap)->cp_index;
2569 int rc = -EBUSY;
2570 int cmd;
2571 ENTRY;
2572
2573 LASSERT(!oap->oap_interrupted);
2574 oap->oap_interrupted = 1;
2575
2576 /* Find out the caching extent */
2577 osc_object_lock(obj);
2578 if (oap->oap_cmd & OBD_BRW_WRITE) {
2579 plist = &obj->oo_urgent_exts;
2580 cmd = OBD_BRW_WRITE;
2581 } else {
2582 plist = &obj->oo_reading_exts;
2583 cmd = OBD_BRW_READ;
2584 }
2585 list_for_each_entry(ext, plist, oe_link) {
2586 if (ext->oe_start <= index && ext->oe_end >= index) {
2587 LASSERT(ext->oe_state == OES_LOCK_DONE);
2588 /* For OES_LOCK_DONE state extent, it has already held
2589 * a refcount for RPC. */
2590 found = osc_extent_get(ext);
2591 break;
2592 }
2593 }
2594 if (found != NULL) {
2595 list_del_init(&found->oe_link);
2596 osc_update_pending(obj, cmd, -found->oe_nr_pages);
2597 osc_object_unlock(obj);
2598
2599 osc_extent_finish(env, found, 0, -EINTR);
2600 osc_extent_put(env, found);
2601 rc = 0;
2602 } else {
2603 osc_object_unlock(obj);
2604 /* ok, it's been put in an rpc. only one oap gets a request
2605 * reference */
2606 if (oap->oap_request != NULL) {
2607 ptlrpc_mark_interrupted(oap->oap_request);
2608 ptlrpcd_wake(oap->oap_request);
2609 ptlrpc_req_finished(oap->oap_request);
2610 oap->oap_request = NULL;
2611 }
2612 }
2613
2614 osc_list_maint(cli, obj);
2615 RETURN(rc);
2616}
2617
2618int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
2619 struct list_head *list, int cmd, int brw_flags)
2620{
2621 struct client_obd *cli = osc_cli(obj);
2622 struct osc_extent *ext;
2623 struct osc_async_page *oap;
2624 int page_count = 0;
2625 int mppr = cli->cl_max_pages_per_rpc;
2626 pgoff_t start = CL_PAGE_EOF;
2627 pgoff_t end = 0;
2628 ENTRY;
2629
2630 list_for_each_entry(oap, list, oap_pending_item) {
2631 struct cl_page *cp = oap2cl_page(oap);
2632 if (cp->cp_index > end)
2633 end = cp->cp_index;
2634 if (cp->cp_index < start)
2635 start = cp->cp_index;
2636 ++page_count;
2637 mppr <<= (page_count > mppr);
2638 }
2639
2640 ext = osc_extent_alloc(obj);
2641 if (ext == NULL) {
2642 list_for_each_entry(oap, list, oap_pending_item) {
2643 list_del_init(&oap->oap_pending_item);
2644 osc_ap_completion(env, cli, oap, 0, -ENOMEM);
2645 }
2646 RETURN(-ENOMEM);
2647 }
2648
2649 ext->oe_rw = !!(cmd & OBD_BRW_READ);
2650 ext->oe_urgent = 1;
2651 ext->oe_start = start;
2652 ext->oe_end = ext->oe_max_end = end;
2653 ext->oe_obj = obj;
2654 ext->oe_srvlock = !!(brw_flags & OBD_BRW_SRVLOCK);
2655 ext->oe_nr_pages = page_count;
2656 ext->oe_mppr = mppr;
2657 list_splice_init(list, &ext->oe_pages);
2658
2659 osc_object_lock(obj);
2660 /* Reuse the initial refcount for RPC, don't drop it */
2661 osc_extent_state_set(ext, OES_LOCK_DONE);
2662 if (cmd & OBD_BRW_WRITE) {
2663 list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
2664 osc_update_pending(obj, OBD_BRW_WRITE, page_count);
2665 } else {
2666 list_add_tail(&ext->oe_link, &obj->oo_reading_exts);
2667 osc_update_pending(obj, OBD_BRW_READ, page_count);
2668 }
2669 osc_object_unlock(obj);
2670
2671 osc_io_unplug(env, cli, obj, PDL_POLICY_ROUND);
2672 RETURN(0);
2673}
2674
2675/**
2676 * Called by osc_io_setattr_start() to freeze and destroy covering extents.
2677 */
2678int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
2679 struct osc_object *obj, __u64 size)
2680{
2681 struct client_obd *cli = osc_cli(obj);
2682 struct osc_extent *ext;
2683 struct osc_extent *waiting = NULL;
2684 pgoff_t index;
2685 LIST_HEAD(list);
2686 int result = 0;
2687 bool partial;
2688 ENTRY;
2689
2690 /* pages with index greater or equal to index will be truncated. */
2691 index = cl_index(osc2cl(obj), size);
2692 partial = size > cl_offset(osc2cl(obj), index);
2693
2694again:
2695 osc_object_lock(obj);
2696 ext = osc_extent_search(obj, index);
2697 if (ext == NULL)
2698 ext = first_extent(obj);
2699 else if (ext->oe_end < index)
2700 ext = next_extent(ext);
2701 while (ext != NULL) {
2702 EASSERT(ext->oe_state != OES_TRUNC, ext);
2703
2704 if (ext->oe_state > OES_CACHE || ext->oe_urgent) {
2705 /* if ext is in urgent state, it means there must exist
2706 * a page already having been flushed by write_page().
2707 * We have to wait for this extent because we can't
2708 * truncate that page. */
2709 LASSERT(!ext->oe_hp);
2710 OSC_EXTENT_DUMP(D_CACHE, ext,
2711 "waiting for busy extent\n");
2712 waiting = osc_extent_get(ext);
2713 break;
2714 }
2715
2716 OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:"LPU64".\n", size);
2717
2718 osc_extent_get(ext);
2719 if (ext->oe_state == OES_ACTIVE) {
2720 /* though we grab inode mutex for write path, but we
2721 * release it before releasing extent(in osc_io_end()),
2722 * so there is a race window that an extent is still
2723 * in OES_ACTIVE when truncate starts. */
2724 LASSERT(!ext->oe_trunc_pending);
2725 ext->oe_trunc_pending = 1;
2726 } else {
2727 EASSERT(ext->oe_state == OES_CACHE, ext);
2728 osc_extent_state_set(ext, OES_TRUNC);
2729 osc_update_pending(obj, OBD_BRW_WRITE,
2730 -ext->oe_nr_pages);
2731 }
2732 EASSERT(list_empty(&ext->oe_link), ext);
2733 list_add_tail(&ext->oe_link, &list);
2734
2735 ext = next_extent(ext);
2736 }
2737 osc_object_unlock(obj);
2738
2739 osc_list_maint(cli, obj);
2740
2741 while (!list_empty(&list)) {
2742 int rc;
2743
2744 ext = list_entry(list.next, struct osc_extent, oe_link);
2745 list_del_init(&ext->oe_link);
2746
2747 /* extent may be in OES_ACTIVE state because inode mutex
2748 * is released before osc_io_end() in file write case */
2749 if (ext->oe_state != OES_TRUNC)
2750 osc_extent_wait(env, ext, OES_TRUNC);
2751
2752 rc = osc_extent_truncate(ext, index, partial);
2753 if (rc < 0) {
2754 if (result == 0)
2755 result = rc;
2756
2757 OSC_EXTENT_DUMP(D_ERROR, ext,
2758 "truncate error %d\n", rc);
2759 } else if (ext->oe_nr_pages == 0) {
2760 osc_extent_remove(ext);
2761 } else {
2762 /* this must be an overlapped extent which means only
2763 * part of pages in this extent have been truncated.
2764 */
2765 EASSERTF(ext->oe_start <= index, ext,
2766 "trunc index = %lu/%d.\n", index, partial);
2767 /* fix index to skip this partially truncated extent */
2768 index = ext->oe_end + 1;
2769 partial = false;
2770
2771 /* we need to hold this extent in OES_TRUNC state so
2772 * that no writeback will happen. This is to avoid
2773 * BUG 17397. */
2774 LASSERT(oio->oi_trunc == NULL);
2775 oio->oi_trunc = osc_extent_get(ext);
2776 OSC_EXTENT_DUMP(D_CACHE, ext,
2777 "trunc at "LPU64"\n", size);
2778 }
2779 osc_extent_put(env, ext);
2780 }
2781 if (waiting != NULL) {
2782 int rc;
2783
2784 /* ignore the result of osc_extent_wait the write initiator
2785 * should take care of it. */
2786 rc = osc_extent_wait(env, waiting, OES_INV);
2787 if (rc < 0)
2788 OSC_EXTENT_DUMP(D_CACHE, ext, "wait error: %d.\n", rc);
2789
2790 osc_extent_put(env, waiting);
2791 waiting = NULL;
2792 goto again;
2793 }
2794 RETURN(result);
2795}
2796
2797/**
2798 * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
2799 */
2800void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
2801 struct osc_object *obj)
2802{
2803 struct osc_extent *ext = oio->oi_trunc;
2804
2805 oio->oi_trunc = NULL;
2806 if (ext != NULL) {
2807 bool unplug = false;
2808
2809 EASSERT(ext->oe_nr_pages > 0, ext);
2810 EASSERT(ext->oe_state == OES_TRUNC, ext);
2811 EASSERT(!ext->oe_urgent, ext);
2812
2813 OSC_EXTENT_DUMP(D_CACHE, ext, "trunc -> cache.\n");
2814 osc_object_lock(obj);
2815 osc_extent_state_set(ext, OES_CACHE);
2816 if (ext->oe_fsync_wait && !ext->oe_urgent) {
2817 ext->oe_urgent = 1;
2818 list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
2819 unplug = true;
2820 }
2821 osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
2822 osc_object_unlock(obj);
2823 osc_extent_put(env, ext);
2824
2825 if (unplug)
2826 osc_io_unplug_async(env, osc_cli(obj), obj);
2827 }
2828}
2829
2830/**
2831 * Wait for extents in a specific range to be written out.
2832 * The caller must have called osc_cache_writeback_range() to issue IO
2833 * otherwise it will take a long time for this function to finish.
2834 *
2835 * Caller must hold inode_mutex , or cancel exclusive dlm lock so that
2836 * nobody else can dirty this range of file while we're waiting for
2837 * extents to be written.
2838 */
2839int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
2840 pgoff_t start, pgoff_t end)
2841{
2842 struct osc_extent *ext;
2843 pgoff_t index = start;
2844 int result = 0;
2845 ENTRY;
2846
2847again:
2848 osc_object_lock(obj);
2849 ext = osc_extent_search(obj, index);
2850 if (ext == NULL)
2851 ext = first_extent(obj);
2852 else if (ext->oe_end < index)
2853 ext = next_extent(ext);
2854 while (ext != NULL) {
2855 int rc;
2856
2857 if (ext->oe_start > end)
2858 break;
2859
2860 if (!ext->oe_fsync_wait) {
2861 ext = next_extent(ext);
2862 continue;
2863 }
2864
2865 EASSERT(ergo(ext->oe_state == OES_CACHE,
2866 ext->oe_hp || ext->oe_urgent), ext);
2867 EASSERT(ergo(ext->oe_state == OES_ACTIVE,
2868 !ext->oe_hp && ext->oe_urgent), ext);
2869
2870 index = ext->oe_end + 1;
2871 osc_extent_get(ext);
2872 osc_object_unlock(obj);
2873
2874 rc = osc_extent_wait(env, ext, OES_INV);
2875 if (result == 0)
2876 result = rc;
2877 osc_extent_put(env, ext);
2878 goto again;
2879 }
2880 osc_object_unlock(obj);
2881
2882 OSC_IO_DEBUG(obj, "sync file range.\n");
2883 RETURN(result);
2884}
2885
2886/**
2887 * Called to write out a range of osc object.
2888 *
2889 * @hp : should be set this is caused by lock cancel;
2890 * @discard: is set if dirty pages should be dropped - file will be deleted or
2891 * truncated, this implies there is no partially discarding extents.
2892 *
2893 * Return how many pages will be issued, or error code if error occurred.
2894 */
2895int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
2896 pgoff_t start, pgoff_t end, int hp, int discard)
2897{
2898 struct osc_extent *ext;
2899 LIST_HEAD(discard_list);
2900 bool unplug = false;
2901 int result = 0;
2902 ENTRY;
2903
2904 osc_object_lock(obj);
2905 ext = osc_extent_search(obj, start);
2906 if (ext == NULL)
2907 ext = first_extent(obj);
2908 else if (ext->oe_end < start)
2909 ext = next_extent(ext);
2910 while (ext != NULL) {
2911 if (ext->oe_start > end)
2912 break;
2913
2914 ext->oe_fsync_wait = 1;
2915 switch (ext->oe_state) {
2916 case OES_CACHE:
2917 result += ext->oe_nr_pages;
2918 if (!discard) {
2919 struct list_head *list = NULL;
2920 if (hp) {
2921 EASSERT(!ext->oe_hp, ext);
2922 ext->oe_hp = 1;
2923 list = &obj->oo_hp_exts;
2924 } else if (!ext->oe_urgent) {
2925 ext->oe_urgent = 1;
2926 list = &obj->oo_urgent_exts;
2927 }
2928 if (list != NULL)
2929 list_move_tail(&ext->oe_link, list);
2930 unplug = true;
2931 } else {
2932 /* the only discarder is lock cancelling, so
2933 * [start, end] must contain this extent */
2934 EASSERT(ext->oe_start >= start &&
2935 ext->oe_max_end <= end, ext);
2936 osc_extent_state_set(ext, OES_LOCKING);
2937 ext->oe_owner = current;
2938 list_move_tail(&ext->oe_link,
2939 &discard_list);
2940 osc_update_pending(obj, OBD_BRW_WRITE,
2941 -ext->oe_nr_pages);
2942 }
2943 break;
2944 case OES_ACTIVE:
2945 /* It's pretty bad to wait for ACTIVE extents, because
2946 * we don't know how long we will wait for it to be
2947 * flushed since it may be blocked at awaiting more
2948 * grants. We do this for the correctness of fsync. */
2949 LASSERT(hp == 0 && discard == 0);
2950 ext->oe_urgent = 1;
2951 break;
2952 case OES_TRUNC:
2953 /* this extent is being truncated, can't do anything
2954 * for it now. it will be set to urgent after truncate
2955 * is finished in osc_cache_truncate_end(). */
2956 default:
2957 break;
2958 }
2959 ext = next_extent(ext);
2960 }
2961 osc_object_unlock(obj);
2962
2963 LASSERT(ergo(!discard, list_empty(&discard_list)));
2964 if (!list_empty(&discard_list)) {
2965 struct osc_extent *tmp;
2966 int rc;
2967
2968 osc_list_maint(osc_cli(obj), obj);
2969 list_for_each_entry_safe(ext, tmp, &discard_list, oe_link) {
2970 list_del_init(&ext->oe_link);
2971 EASSERT(ext->oe_state == OES_LOCKING, ext);
2972
2973 /* Discard caching pages. We don't actually write this
2974 * extent out but we complete it as if we did. */
2975 rc = osc_extent_make_ready(env, ext);
2976 if (unlikely(rc < 0)) {
2977 OSC_EXTENT_DUMP(D_ERROR, ext,
2978 "make_ready returned %d\n", rc);
2979 if (result >= 0)
2980 result = rc;
2981 }
2982
2983 /* finish the extent as if the pages were sent */
2984 osc_extent_finish(env, ext, 0, 0);
2985 }
2986 }
2987
2988 if (unplug)
2989 osc_io_unplug(env, osc_cli(obj), obj, PDL_POLICY_ROUND);
2990
2991 if (hp || discard) {
2992 int rc;
2993 rc = osc_cache_wait_range(env, obj, start, end);
2994 if (result >= 0 && rc < 0)
2995 result = rc;
2996 }
2997
2998 OSC_IO_DEBUG(obj, "cache page out.\n");
2999 RETURN(result);
3000}
3001
3002/** @} osc */
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