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Linux 3.12.28
[linux/fpc-iii.git] / fs / btrfs / delayed-inode.c
blobcbd9523ad09cae0ffff1688371b370a756aef2f5
1 /*
2 * Copyright (C) 2011 Fujitsu. All rights reserved.
3 * Written by Miao Xie <miaox@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
18 */
19
20 #include <linux/slab.h>
21 #include "delayed-inode.h"
22 #include "disk-io.h"
23 #include "transaction.h"
24 #include "ctree.h"
25
26 #define BTRFS_DELAYED_WRITEBACK 512
27 #define BTRFS_DELAYED_BACKGROUND 128
28 #define BTRFS_DELAYED_BATCH 16
29
30 static struct kmem_cache *delayed_node_cache;
31
32 int __init btrfs_delayed_inode_init(void)
33 {
34 delayed_node_cache = kmem_cache_create("btrfs_delayed_node",
35 sizeof(struct btrfs_delayed_node),
36 0,
37 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
38 NULL);
39 if (!delayed_node_cache)
40 return -ENOMEM;
41 return 0;
42 }
43
44 void btrfs_delayed_inode_exit(void)
45 {
46 if (delayed_node_cache)
47 kmem_cache_destroy(delayed_node_cache);
48 }
49
50 static inline void btrfs_init_delayed_node(
51 struct btrfs_delayed_node *delayed_node,
52 struct btrfs_root *root, u64 inode_id)
53 {
54 delayed_node->root = root;
55 delayed_node->inode_id = inode_id;
56 atomic_set(&delayed_node->refs, 0);
57 delayed_node->count = 0;
58 delayed_node->in_list = 0;
59 delayed_node->inode_dirty = 0;
60 delayed_node->ins_root = RB_ROOT;
61 delayed_node->del_root = RB_ROOT;
62 mutex_init(&delayed_node->mutex);
63 delayed_node->index_cnt = 0;
64 INIT_LIST_HEAD(&delayed_node->n_list);
65 INIT_LIST_HEAD(&delayed_node->p_list);
66 delayed_node->bytes_reserved = 0;
67 memset(&delayed_node->inode_item, 0, sizeof(delayed_node->inode_item));
68 }
69
70 static inline int btrfs_is_continuous_delayed_item(
71 struct btrfs_delayed_item *item1,
72 struct btrfs_delayed_item *item2)
73 {
74 if (item1->key.type == BTRFS_DIR_INDEX_KEY &&
75 item1->key.objectid == item2->key.objectid &&
76 item1->key.type == item2->key.type &&
77 item1->key.offset + 1 == item2->key.offset)
78 return 1;
79 return 0;
80 }
81
82 static inline struct btrfs_delayed_root *btrfs_get_delayed_root(
83 struct btrfs_root *root)
84 {
85 return root->fs_info->delayed_root;
86 }
87
88 static struct btrfs_delayed_node *btrfs_get_delayed_node(struct inode *inode)
89 {
90 struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
91 struct btrfs_root *root = btrfs_inode->root;
92 u64 ino = btrfs_ino(inode);
93 struct btrfs_delayed_node *node;
94
95 node = ACCESS_ONCE(btrfs_inode->delayed_node);
96 if (node) {
97 atomic_inc(&node->refs);
98 return node;
99 }
100
101 spin_lock(&root->inode_lock);
102 node = radix_tree_lookup(&root->delayed_nodes_tree, ino);
103 if (node) {
104 if (btrfs_inode->delayed_node) {
105 atomic_inc(&node->refs); /* can be accessed */
106 BUG_ON(btrfs_inode->delayed_node != node);
107 spin_unlock(&root->inode_lock);
108 return node;
109 }
110 btrfs_inode->delayed_node = node;
111 atomic_inc(&node->refs); /* can be accessed */
112 atomic_inc(&node->refs); /* cached in the inode */
113 spin_unlock(&root->inode_lock);
114 return node;
115 }
116 spin_unlock(&root->inode_lock);
117
118 return NULL;
119 }
120
121 /* Will return either the node or PTR_ERR(-ENOMEM) */
122 static struct btrfs_delayed_node *btrfs_get_or_create_delayed_node(
123 struct inode *inode)
124 {
125 struct btrfs_delayed_node *node;
126 struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
127 struct btrfs_root *root = btrfs_inode->root;
128 u64 ino = btrfs_ino(inode);
129 int ret;
130
131 again:
132 node = btrfs_get_delayed_node(inode);
133 if (node)
134 return node;
135
136 node = kmem_cache_alloc(delayed_node_cache, GFP_NOFS);
137 if (!node)
138 return ERR_PTR(-ENOMEM);
139 btrfs_init_delayed_node(node, root, ino);
140
141 atomic_inc(&node->refs); /* cached in the btrfs inode */
142 atomic_inc(&node->refs); /* can be accessed */
143
144 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
145 if (ret) {
146 kmem_cache_free(delayed_node_cache, node);
147 return ERR_PTR(ret);
148 }
149
150 spin_lock(&root->inode_lock);
151 ret = radix_tree_insert(&root->delayed_nodes_tree, ino, node);
152 if (ret == -EEXIST) {
153 kmem_cache_free(delayed_node_cache, node);
154 spin_unlock(&root->inode_lock);
155 radix_tree_preload_end();
156 goto again;
157 }
158 btrfs_inode->delayed_node = node;
159 spin_unlock(&root->inode_lock);
160 radix_tree_preload_end();
161
162 return node;
163 }
164
165 /*
166 * Call it when holding delayed_node->mutex
167 *
168 * If mod = 1, add this node into the prepared list.
169 */
170 static void btrfs_queue_delayed_node(struct btrfs_delayed_root *root,
171 struct btrfs_delayed_node *node,
172 int mod)
173 {
174 spin_lock(&root->lock);
175 if (node->in_list) {
176 if (!list_empty(&node->p_list))
177 list_move_tail(&node->p_list, &root->prepare_list);
178 else if (mod)
179 list_add_tail(&node->p_list, &root->prepare_list);
180 } else {
181 list_add_tail(&node->n_list, &root->node_list);
182 list_add_tail(&node->p_list, &root->prepare_list);
183 atomic_inc(&node->refs); /* inserted into list */
184 root->nodes++;
185 node->in_list = 1;
186 }
187 spin_unlock(&root->lock);
188 }
189
190 /* Call it when holding delayed_node->mutex */
191 static void btrfs_dequeue_delayed_node(struct btrfs_delayed_root *root,
192 struct btrfs_delayed_node *node)
193 {
194 spin_lock(&root->lock);
195 if (node->in_list) {
196 root->nodes--;
197 atomic_dec(&node->refs); /* not in the list */
198 list_del_init(&node->n_list);
199 if (!list_empty(&node->p_list))
200 list_del_init(&node->p_list);
201 node->in_list = 0;
202 }
203 spin_unlock(&root->lock);
204 }
205
206 static struct btrfs_delayed_node *btrfs_first_delayed_node(
207 struct btrfs_delayed_root *delayed_root)
208 {
209 struct list_head *p;
210 struct btrfs_delayed_node *node = NULL;
211
212 spin_lock(&delayed_root->lock);
213 if (list_empty(&delayed_root->node_list))
214 goto out;
215
216 p = delayed_root->node_list.next;
217 node = list_entry(p, struct btrfs_delayed_node, n_list);
218 atomic_inc(&node->refs);
219 out:
220 spin_unlock(&delayed_root->lock);
221
222 return node;
223 }
224
225 static struct btrfs_delayed_node *btrfs_next_delayed_node(
226 struct btrfs_delayed_node *node)
227 {
228 struct btrfs_delayed_root *delayed_root;
229 struct list_head *p;
230 struct btrfs_delayed_node *next = NULL;
231
232 delayed_root = node->root->fs_info->delayed_root;
233 spin_lock(&delayed_root->lock);
234 if (!node->in_list) { /* not in the list */
235 if (list_empty(&delayed_root->node_list))
236 goto out;
237 p = delayed_root->node_list.next;
238 } else if (list_is_last(&node->n_list, &delayed_root->node_list))
239 goto out;
240 else
241 p = node->n_list.next;
242
243 next = list_entry(p, struct btrfs_delayed_node, n_list);
244 atomic_inc(&next->refs);
245 out:
246 spin_unlock(&delayed_root->lock);
247
248 return next;
249 }
250
251 static void __btrfs_release_delayed_node(
252 struct btrfs_delayed_node *delayed_node,
253 int mod)
254 {
255 struct btrfs_delayed_root *delayed_root;
256
257 if (!delayed_node)
258 return;
259
260 delayed_root = delayed_node->root->fs_info->delayed_root;
261
262 mutex_lock(&delayed_node->mutex);
263 if (delayed_node->count)
264 btrfs_queue_delayed_node(delayed_root, delayed_node, mod);
265 else
266 btrfs_dequeue_delayed_node(delayed_root, delayed_node);
267 mutex_unlock(&delayed_node->mutex);
268
269 if (atomic_dec_and_test(&delayed_node->refs)) {
270 struct btrfs_root *root = delayed_node->root;
271 spin_lock(&root->inode_lock);
272 if (atomic_read(&delayed_node->refs) == 0) {
273 radix_tree_delete(&root->delayed_nodes_tree,
274 delayed_node->inode_id);
275 kmem_cache_free(delayed_node_cache, delayed_node);
276 }
277 spin_unlock(&root->inode_lock);
278 }
279 }
280
281 static inline void btrfs_release_delayed_node(struct btrfs_delayed_node *node)
282 {
283 __btrfs_release_delayed_node(node, 0);
284 }
285
286 static struct btrfs_delayed_node *btrfs_first_prepared_delayed_node(
287 struct btrfs_delayed_root *delayed_root)
288 {
289 struct list_head *p;
290 struct btrfs_delayed_node *node = NULL;
291
292 spin_lock(&delayed_root->lock);
293 if (list_empty(&delayed_root->prepare_list))
294 goto out;
295
296 p = delayed_root->prepare_list.next;
297 list_del_init(p);
298 node = list_entry(p, struct btrfs_delayed_node, p_list);
299 atomic_inc(&node->refs);
300 out:
301 spin_unlock(&delayed_root->lock);
302
303 return node;
304 }
305
306 static inline void btrfs_release_prepared_delayed_node(
307 struct btrfs_delayed_node *node)
308 {
309 __btrfs_release_delayed_node(node, 1);
310 }
311
312 static struct btrfs_delayed_item *btrfs_alloc_delayed_item(u32 data_len)
313 {
314 struct btrfs_delayed_item *item;
315 item = kmalloc(sizeof(*item) + data_len, GFP_NOFS);
316 if (item) {
317 item->data_len = data_len;
318 item->ins_or_del = 0;
319 item->bytes_reserved = 0;
320 item->delayed_node = NULL;
321 atomic_set(&item->refs, 1);
322 }
323 return item;
324 }
325
326 /*
327 * __btrfs_lookup_delayed_item - look up the delayed item by key
328 * @delayed_node: pointer to the delayed node
329 * @key: the key to look up
330 * @prev: used to store the prev item if the right item isn't found
331 * @next: used to store the next item if the right item isn't found
332 *
333 * Note: if we don't find the right item, we will return the prev item and
334 * the next item.
335 */
336 static struct btrfs_delayed_item *__btrfs_lookup_delayed_item(
337 struct rb_root *root,
338 struct btrfs_key *key,
339 struct btrfs_delayed_item **prev,
340 struct btrfs_delayed_item **next)
341 {
342 struct rb_node *node, *prev_node = NULL;
343 struct btrfs_delayed_item *delayed_item = NULL;
344 int ret = 0;
345
346 node = root->rb_node;
347
348 while (node) {
349 delayed_item = rb_entry(node, struct btrfs_delayed_item,
350 rb_node);
351 prev_node = node;
352 ret = btrfs_comp_cpu_keys(&delayed_item->key, key);
353 if (ret < 0)
354 node = node->rb_right;
355 else if (ret > 0)
356 node = node->rb_left;
357 else
358 return delayed_item;
359 }
360
361 if (prev) {
362 if (!prev_node)
363 *prev = NULL;
364 else if (ret < 0)
365 *prev = delayed_item;
366 else if ((node = rb_prev(prev_node)) != NULL) {
367 *prev = rb_entry(node, struct btrfs_delayed_item,
368 rb_node);
369 } else
370 *prev = NULL;
371 }
372
373 if (next) {
374 if (!prev_node)
375 *next = NULL;
376 else if (ret > 0)
377 *next = delayed_item;
378 else if ((node = rb_next(prev_node)) != NULL) {
379 *next = rb_entry(node, struct btrfs_delayed_item,
380 rb_node);
381 } else
382 *next = NULL;
383 }
384 return NULL;
385 }
386
387 static struct btrfs_delayed_item *__btrfs_lookup_delayed_insertion_item(
388 struct btrfs_delayed_node *delayed_node,
389 struct btrfs_key *key)
390 {
391 struct btrfs_delayed_item *item;
392
393 item = __btrfs_lookup_delayed_item(&delayed_node->ins_root, key,
394 NULL, NULL);
395 return item;
396 }
397
398 static int __btrfs_add_delayed_item(struct btrfs_delayed_node *delayed_node,
399 struct btrfs_delayed_item *ins,
400 int action)
401 {
402 struct rb_node **p, *node;
403 struct rb_node *parent_node = NULL;
404 struct rb_root *root;
405 struct btrfs_delayed_item *item;
406 int cmp;
407
408 if (action == BTRFS_DELAYED_INSERTION_ITEM)
409 root = &delayed_node->ins_root;
410 else if (action == BTRFS_DELAYED_DELETION_ITEM)
411 root = &delayed_node->del_root;
412 else
413 BUG();
414 p = &root->rb_node;
415 node = &ins->rb_node;
416
417 while (*p) {
418 parent_node = *p;
419 item = rb_entry(parent_node, struct btrfs_delayed_item,
420 rb_node);
421
422 cmp = btrfs_comp_cpu_keys(&item->key, &ins->key);
423 if (cmp < 0)
424 p = &(*p)->rb_right;
425 else if (cmp > 0)
426 p = &(*p)->rb_left;
427 else
428 return -EEXIST;
429 }
430
431 rb_link_node(node, parent_node, p);
432 rb_insert_color(node, root);
433 ins->delayed_node = delayed_node;
434 ins->ins_or_del = action;
435
436 if (ins->key.type == BTRFS_DIR_INDEX_KEY &&
437 action == BTRFS_DELAYED_INSERTION_ITEM &&
438 ins->key.offset >= delayed_node->index_cnt)
439 delayed_node->index_cnt = ins->key.offset + 1;
440
441 delayed_node->count++;
442 atomic_inc(&delayed_node->root->fs_info->delayed_root->items);
443 return 0;
444 }
445
446 static int __btrfs_add_delayed_insertion_item(struct btrfs_delayed_node *node,
447 struct btrfs_delayed_item *item)
448 {
449 return __btrfs_add_delayed_item(node, item,
450 BTRFS_DELAYED_INSERTION_ITEM);
451 }
452
453 static int __btrfs_add_delayed_deletion_item(struct btrfs_delayed_node *node,
454 struct btrfs_delayed_item *item)
455 {
456 return __btrfs_add_delayed_item(node, item,
457 BTRFS_DELAYED_DELETION_ITEM);
458 }
459
460 static void finish_one_item(struct btrfs_delayed_root *delayed_root)
461 {
462 int seq = atomic_inc_return(&delayed_root->items_seq);
463 if ((atomic_dec_return(&delayed_root->items) <
464 BTRFS_DELAYED_BACKGROUND || seq % BTRFS_DELAYED_BATCH == 0) &&
465 waitqueue_active(&delayed_root->wait))
466 wake_up(&delayed_root->wait);
467 }
468
469 static void __btrfs_remove_delayed_item(struct btrfs_delayed_item *delayed_item)
470 {
471 struct rb_root *root;
472 struct btrfs_delayed_root *delayed_root;
473
474 delayed_root = delayed_item->delayed_node->root->fs_info->delayed_root;
475
476 BUG_ON(!delayed_root);
477 BUG_ON(delayed_item->ins_or_del != BTRFS_DELAYED_DELETION_ITEM &&
478 delayed_item->ins_or_del != BTRFS_DELAYED_INSERTION_ITEM);
479
480 if (delayed_item->ins_or_del == BTRFS_DELAYED_INSERTION_ITEM)
481 root = &delayed_item->delayed_node->ins_root;
482 else
483 root = &delayed_item->delayed_node->del_root;
484
485 rb_erase(&delayed_item->rb_node, root);
486 delayed_item->delayed_node->count--;
487
488 finish_one_item(delayed_root);
489 }
490
491 static void btrfs_release_delayed_item(struct btrfs_delayed_item *item)
492 {
493 if (item) {
494 __btrfs_remove_delayed_item(item);
495 if (atomic_dec_and_test(&item->refs))
496 kfree(item);
497 }
498 }
499
500 static struct btrfs_delayed_item *__btrfs_first_delayed_insertion_item(
501 struct btrfs_delayed_node *delayed_node)
502 {
503 struct rb_node *p;
504 struct btrfs_delayed_item *item = NULL;
505
506 p = rb_first(&delayed_node->ins_root);
507 if (p)
508 item = rb_entry(p, struct btrfs_delayed_item, rb_node);
509
510 return item;
511 }
512
513 static struct btrfs_delayed_item *__btrfs_first_delayed_deletion_item(
514 struct btrfs_delayed_node *delayed_node)
515 {
516 struct rb_node *p;
517 struct btrfs_delayed_item *item = NULL;
518
519 p = rb_first(&delayed_node->del_root);
520 if (p)
521 item = rb_entry(p, struct btrfs_delayed_item, rb_node);
522
523 return item;
524 }
525
526 static struct btrfs_delayed_item *__btrfs_next_delayed_item(
527 struct btrfs_delayed_item *item)
528 {
529 struct rb_node *p;
530 struct btrfs_delayed_item *next = NULL;
531
532 p = rb_next(&item->rb_node);
533 if (p)
534 next = rb_entry(p, struct btrfs_delayed_item, rb_node);
535
536 return next;
537 }
538
539 static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans,
540 struct btrfs_root *root,
541 struct btrfs_delayed_item *item)
542 {
543 struct btrfs_block_rsv *src_rsv;
544 struct btrfs_block_rsv *dst_rsv;
545 u64 num_bytes;
546 int ret;
547
548 if (!trans->bytes_reserved)
549 return 0;
550
551 src_rsv = trans->block_rsv;
552 dst_rsv = &root->fs_info->delayed_block_rsv;
553
554 num_bytes = btrfs_calc_trans_metadata_size(root, 1);
555 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
556 if (!ret) {
557 trace_btrfs_space_reservation(root->fs_info, "delayed_item",
558 item->key.objectid,
559 num_bytes, 1);
560 item->bytes_reserved = num_bytes;
561 }
562
563 return ret;
564 }
565
566 static void btrfs_delayed_item_release_metadata(struct btrfs_root *root,
567 struct btrfs_delayed_item *item)
568 {
569 struct btrfs_block_rsv *rsv;
570
571 if (!item->bytes_reserved)
572 return;
573
574 rsv = &root->fs_info->delayed_block_rsv;
575 trace_btrfs_space_reservation(root->fs_info, "delayed_item",
576 item->key.objectid, item->bytes_reserved,
577 0);
578 btrfs_block_rsv_release(root, rsv,
579 item->bytes_reserved);
580 }
581
582 static int btrfs_delayed_inode_reserve_metadata(
583 struct btrfs_trans_handle *trans,
584 struct btrfs_root *root,
585 struct inode *inode,
586 struct btrfs_delayed_node *node)
587 {
588 struct btrfs_block_rsv *src_rsv;
589 struct btrfs_block_rsv *dst_rsv;
590 u64 num_bytes;
591 int ret;
592 bool release = false;
593
594 src_rsv = trans->block_rsv;
595 dst_rsv = &root->fs_info->delayed_block_rsv;
596
597 num_bytes = btrfs_calc_trans_metadata_size(root, 1);
598
599 /*
600 * btrfs_dirty_inode will update the inode under btrfs_join_transaction
601 * which doesn't reserve space for speed. This is a problem since we
602 * still need to reserve space for this update, so try to reserve the
603 * space.
604 *
605 * Now if src_rsv == delalloc_block_rsv we'll let it just steal since
606 * we're accounted for.
607 */
608 if (!src_rsv || (!trans->bytes_reserved &&
609 src_rsv->type != BTRFS_BLOCK_RSV_DELALLOC)) {
610 ret = btrfs_block_rsv_add(root, dst_rsv, num_bytes,
611 BTRFS_RESERVE_NO_FLUSH);
612 /*
613 * Since we're under a transaction reserve_metadata_bytes could
614 * try to commit the transaction which will make it return
615 * EAGAIN to make us stop the transaction we have, so return
616 * ENOSPC instead so that btrfs_dirty_inode knows what to do.
617 */
618 if (ret == -EAGAIN)
619 ret = -ENOSPC;
620 if (!ret) {
621 node->bytes_reserved = num_bytes;
622 trace_btrfs_space_reservation(root->fs_info,
623 "delayed_inode",
624 btrfs_ino(inode),
625 num_bytes, 1);
626 }
627 return ret;
628 } else if (src_rsv->type == BTRFS_BLOCK_RSV_DELALLOC) {
629 spin_lock(&BTRFS_I(inode)->lock);
630 if (test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED,
631 &BTRFS_I(inode)->runtime_flags)) {
632 spin_unlock(&BTRFS_I(inode)->lock);
633 release = true;
634 goto migrate;
635 }
636 spin_unlock(&BTRFS_I(inode)->lock);
637
638 /* Ok we didn't have space pre-reserved. This shouldn't happen
639 * too often but it can happen if we do delalloc to an existing
640 * inode which gets dirtied because of the time update, and then
641 * isn't touched again until after the transaction commits and
642 * then we try to write out the data. First try to be nice and
643 * reserve something strictly for us. If not be a pain and try
644 * to steal from the delalloc block rsv.
645 */
646 ret = btrfs_block_rsv_add(root, dst_rsv, num_bytes,
647 BTRFS_RESERVE_NO_FLUSH);
648 if (!ret)
649 goto out;
650
651 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
652 if (!ret)
653 goto out;
654
655 /*
656 * Ok this is a problem, let's just steal from the global rsv
657 * since this really shouldn't happen that often.
658 */
659 WARN_ON(1);
660 ret = btrfs_block_rsv_migrate(&root->fs_info->global_block_rsv,
661 dst_rsv, num_bytes);
662 goto out;
663 }
664
665 migrate:
666 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
667
668 out:
669 /*
670 * Migrate only takes a reservation, it doesn't touch the size of the
671 * block_rsv. This is to simplify people who don't normally have things
672 * migrated from their block rsv. If they go to release their
673 * reservation, that will decrease the size as well, so if migrate
674 * reduced size we'd end up with a negative size. But for the
675 * delalloc_meta_reserved stuff we will only know to drop 1 reservation,
676 * but we could in fact do this reserve/migrate dance several times
677 * between the time we did the original reservation and we'd clean it
678 * up. So to take care of this, release the space for the meta
679 * reservation here. I think it may be time for a documentation page on
680 * how block rsvs. work.
681 */
682 if (!ret) {
683 trace_btrfs_space_reservation(root->fs_info, "delayed_inode",
684 btrfs_ino(inode), num_bytes, 1);
685 node->bytes_reserved = num_bytes;
686 }
687
688 if (release) {
689 trace_btrfs_space_reservation(root->fs_info, "delalloc",
690 btrfs_ino(inode), num_bytes, 0);
691 btrfs_block_rsv_release(root, src_rsv, num_bytes);
692 }
693
694 return ret;
695 }
696
697 static void btrfs_delayed_inode_release_metadata(struct btrfs_root *root,
698 struct btrfs_delayed_node *node)
699 {
700 struct btrfs_block_rsv *rsv;
701
702 if (!node->bytes_reserved)
703 return;
704
705 rsv = &root->fs_info->delayed_block_rsv;
706 trace_btrfs_space_reservation(root->fs_info, "delayed_inode",
707 node->inode_id, node->bytes_reserved, 0);
708 btrfs_block_rsv_release(root, rsv,
709 node->bytes_reserved);
710 node->bytes_reserved = 0;
711 }
712
713 /*
714 * This helper will insert some continuous items into the same leaf according
715 * to the free space of the leaf.
716 */
717 static int btrfs_batch_insert_items(struct btrfs_root *root,
718 struct btrfs_path *path,
719 struct btrfs_delayed_item *item)
720 {
721 struct btrfs_delayed_item *curr, *next;
722 int free_space;
723 int total_data_size = 0, total_size = 0;
724 struct extent_buffer *leaf;
725 char *data_ptr;
726 struct btrfs_key *keys;
727 u32 *data_size;
728 struct list_head head;
729 int slot;
730 int nitems;
731 int i;
732 int ret = 0;
733
734 BUG_ON(!path->nodes[0]);
735
736 leaf = path->nodes[0];
737 free_space = btrfs_leaf_free_space(root, leaf);
738 INIT_LIST_HEAD(&head);
739
740 next = item;
741 nitems = 0;
742
743 /*
744 * count the number of the continuous items that we can insert in batch
745 */
746 while (total_size + next->data_len + sizeof(struct btrfs_item) <=
747 free_space) {
748 total_data_size += next->data_len;
749 total_size += next->data_len + sizeof(struct btrfs_item);
750 list_add_tail(&next->tree_list, &head);
751 nitems++;
752
753 curr = next;
754 next = __btrfs_next_delayed_item(curr);
755 if (!next)
756 break;
757
758 if (!btrfs_is_continuous_delayed_item(curr, next))
759 break;
760 }
761
762 if (!nitems) {
763 ret = 0;
764 goto out;
765 }
766
767 /*
768 * we need allocate some memory space, but it might cause the task
769 * to sleep, so we set all locked nodes in the path to blocking locks
770 * first.
771 */
772 btrfs_set_path_blocking(path);
773
774 keys = kmalloc(sizeof(struct btrfs_key) * nitems, GFP_NOFS);
775 if (!keys) {
776 ret = -ENOMEM;
777 goto out;
778 }
779
780 data_size = kmalloc(sizeof(u32) * nitems, GFP_NOFS);
781 if (!data_size) {
782 ret = -ENOMEM;
783 goto error;
784 }
785
786 /* get keys of all the delayed items */
787 i = 0;
788 list_for_each_entry(next, &head, tree_list) {
789 keys[i] = next->key;
790 data_size[i] = next->data_len;
791 i++;
792 }
793
794 /* reset all the locked nodes in the patch to spinning locks. */
795 btrfs_clear_path_blocking(path, NULL, 0);
796
797 /* insert the keys of the items */
798 setup_items_for_insert(root, path, keys, data_size,
799 total_data_size, total_size, nitems);
800
801 /* insert the dir index items */
802 slot = path->slots[0];
803 list_for_each_entry_safe(curr, next, &head, tree_list) {
804 data_ptr = btrfs_item_ptr(leaf, slot, char);
805 write_extent_buffer(leaf, &curr->data,
806 (unsigned long)data_ptr,
807 curr->data_len);
808 slot++;
809
810 btrfs_delayed_item_release_metadata(root, curr);
811
812 list_del(&curr->tree_list);
813 btrfs_release_delayed_item(curr);
814 }
815
816 error:
817 kfree(data_size);
818 kfree(keys);
819 out:
820 return ret;
821 }
822
823 /*
824 * This helper can just do simple insertion that needn't extend item for new
825 * data, such as directory name index insertion, inode insertion.
826 */
827 static int btrfs_insert_delayed_item(struct btrfs_trans_handle *trans,
828 struct btrfs_root *root,
829 struct btrfs_path *path,
830 struct btrfs_delayed_item *delayed_item)
831 {
832 struct extent_buffer *leaf;
833 char *ptr;
834 int ret;
835
836 ret = btrfs_insert_empty_item(trans, root, path, &delayed_item->key,
837 delayed_item->data_len);
838 if (ret < 0 && ret != -EEXIST)
839 return ret;
840
841 leaf = path->nodes[0];
842
843 ptr = btrfs_item_ptr(leaf, path->slots[0], char);
844
845 write_extent_buffer(leaf, delayed_item->data, (unsigned long)ptr,
846 delayed_item->data_len);
847 btrfs_mark_buffer_dirty(leaf);
848
849 btrfs_delayed_item_release_metadata(root, delayed_item);
850 return 0;
851 }
852
853 /*
854 * we insert an item first, then if there are some continuous items, we try
855 * to insert those items into the same leaf.
856 */
857 static int btrfs_insert_delayed_items(struct btrfs_trans_handle *trans,
858 struct btrfs_path *path,
859 struct btrfs_root *root,
860 struct btrfs_delayed_node *node)
861 {
862 struct btrfs_delayed_item *curr, *prev;
863 int ret = 0;
864
865 do_again:
866 mutex_lock(&node->mutex);
867 curr = __btrfs_first_delayed_insertion_item(node);
868 if (!curr)
869 goto insert_end;
870
871 ret = btrfs_insert_delayed_item(trans, root, path, curr);
872 if (ret < 0) {
873 btrfs_release_path(path);
874 goto insert_end;
875 }
876
877 prev = curr;
878 curr = __btrfs_next_delayed_item(prev);
879 if (curr && btrfs_is_continuous_delayed_item(prev, curr)) {
880 /* insert the continuous items into the same leaf */
881 path->slots[0]++;
882 btrfs_batch_insert_items(root, path, curr);
883 }
884 btrfs_release_delayed_item(prev);
885 btrfs_mark_buffer_dirty(path->nodes[0]);
886
887 btrfs_release_path(path);
888 mutex_unlock(&node->mutex);
889 goto do_again;
890
891 insert_end:
892 mutex_unlock(&node->mutex);
893 return ret;
894 }
895
896 static int btrfs_batch_delete_items(struct btrfs_trans_handle *trans,
897 struct btrfs_root *root,
898 struct btrfs_path *path,
899 struct btrfs_delayed_item *item)
900 {
901 struct btrfs_delayed_item *curr, *next;
902 struct extent_buffer *leaf;
903 struct btrfs_key key;
904 struct list_head head;
905 int nitems, i, last_item;
906 int ret = 0;
907
908 BUG_ON(!path->nodes[0]);
909
910 leaf = path->nodes[0];
911
912 i = path->slots[0];
913 last_item = btrfs_header_nritems(leaf) - 1;
914 if (i > last_item)
915 return -ENOENT; /* FIXME: Is errno suitable? */
916
917 next = item;
918 INIT_LIST_HEAD(&head);
919 btrfs_item_key_to_cpu(leaf, &key, i);
920 nitems = 0;
921 /*
922 * count the number of the dir index items that we can delete in batch
923 */
924 while (btrfs_comp_cpu_keys(&next->key, &key) == 0) {
925 list_add_tail(&next->tree_list, &head);
926 nitems++;
927
928 curr = next;
929 next = __btrfs_next_delayed_item(curr);
930 if (!next)
931 break;
932
933 if (!btrfs_is_continuous_delayed_item(curr, next))
934 break;
935
936 i++;
937 if (i > last_item)
938 break;
939 btrfs_item_key_to_cpu(leaf, &key, i);
940 }
941
942 if (!nitems)
943 return 0;
944
945 ret = btrfs_del_items(trans, root, path, path->slots[0], nitems);
946 if (ret)
947 goto out;
948
949 list_for_each_entry_safe(curr, next, &head, tree_list) {
950 btrfs_delayed_item_release_metadata(root, curr);
951 list_del(&curr->tree_list);
952 btrfs_release_delayed_item(curr);
953 }
954
955 out:
956 return ret;
957 }
958
959 static int btrfs_delete_delayed_items(struct btrfs_trans_handle *trans,
960 struct btrfs_path *path,
961 struct btrfs_root *root,
962 struct btrfs_delayed_node *node)
963 {
964 struct btrfs_delayed_item *curr, *prev;
965 int ret = 0;
966
967 do_again:
968 mutex_lock(&node->mutex);
969 curr = __btrfs_first_delayed_deletion_item(node);
970 if (!curr)
971 goto delete_fail;
972
973 ret = btrfs_search_slot(trans, root, &curr->key, path, -1, 1);
974 if (ret < 0)
975 goto delete_fail;
976 else if (ret > 0) {
977 /*
978 * can't find the item which the node points to, so this node
979 * is invalid, just drop it.
980 */
981 prev = curr;
982 curr = __btrfs_next_delayed_item(prev);
983 btrfs_release_delayed_item(prev);
984 ret = 0;
985 btrfs_release_path(path);
986 if (curr) {
987 mutex_unlock(&node->mutex);
988 goto do_again;
989 } else
990 goto delete_fail;
991 }
992
993 btrfs_batch_delete_items(trans, root, path, curr);
994 btrfs_release_path(path);
995 mutex_unlock(&node->mutex);
996 goto do_again;
997
998 delete_fail:
999 btrfs_release_path(path);
1000 mutex_unlock(&node->mutex);
1001 return ret;
1002 }
1003
1004 static void btrfs_release_delayed_inode(struct btrfs_delayed_node *delayed_node)
1005 {
1006 struct btrfs_delayed_root *delayed_root;
1007
1008 if (delayed_node && delayed_node->inode_dirty) {
1009 BUG_ON(!delayed_node->root);
1010 delayed_node->inode_dirty = 0;
1011 delayed_node->count--;
1012
1013 delayed_root = delayed_node->root->fs_info->delayed_root;
1014 finish_one_item(delayed_root);
1015 }
1016 }
1017
1018 static int __btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
1019 struct btrfs_root *root,
1020 struct btrfs_path *path,
1021 struct btrfs_delayed_node *node)
1022 {
1023 struct btrfs_key key;
1024 struct btrfs_inode_item *inode_item;
1025 struct extent_buffer *leaf;
1026 int ret;
1027
1028 key.objectid = node->inode_id;
1029 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1030 key.offset = 0;
1031
1032 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1033 if (ret > 0) {
1034 btrfs_release_path(path);
1035 return -ENOENT;
1036 } else if (ret < 0) {
1037 return ret;
1038 }
1039
1040 btrfs_unlock_up_safe(path, 1);
1041 leaf = path->nodes[0];
1042 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1043 struct btrfs_inode_item);
1044 write_extent_buffer(leaf, &node->inode_item, (unsigned long)inode_item,
1045 sizeof(struct btrfs_inode_item));
1046 btrfs_mark_buffer_dirty(leaf);
1047 btrfs_release_path(path);
1048
1049 btrfs_delayed_inode_release_metadata(root, node);
1050 btrfs_release_delayed_inode(node);
1051
1052 return 0;
1053 }
1054
1055 static inline int btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root,
1057 struct btrfs_path *path,
1058 struct btrfs_delayed_node *node)
1059 {
1060 int ret;
1061
1062 mutex_lock(&node->mutex);
1063 if (!node->inode_dirty) {
1064 mutex_unlock(&node->mutex);
1065 return 0;
1066 }
1067
1068 ret = __btrfs_update_delayed_inode(trans, root, path, node);
1069 mutex_unlock(&node->mutex);
1070 return ret;
1071 }
1072
1073 static inline int
1074 __btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
1075 struct btrfs_path *path,
1076 struct btrfs_delayed_node *node)
1077 {
1078 int ret;
1079
1080 ret = btrfs_insert_delayed_items(trans, path, node->root, node);
1081 if (ret)
1082 return ret;
1083
1084 ret = btrfs_delete_delayed_items(trans, path, node->root, node);
1085 if (ret)
1086 return ret;
1087
1088 ret = btrfs_update_delayed_inode(trans, node->root, path, node);
1089 return ret;
1090 }
1091
1092 /*
1093 * Called when committing the transaction.
1094 * Returns 0 on success.
1095 * Returns < 0 on error and returns with an aborted transaction with any
1096 * outstanding delayed items cleaned up.
1097 */
1098 static int __btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
1099 struct btrfs_root *root, int nr)
1100 {
1101 struct btrfs_delayed_root *delayed_root;
1102 struct btrfs_delayed_node *curr_node, *prev_node;
1103 struct btrfs_path *path;
1104 struct btrfs_block_rsv *block_rsv;
1105 int ret = 0;
1106 bool count = (nr > 0);
1107
1108 if (trans->aborted)
1109 return -EIO;
1110
1111 path = btrfs_alloc_path();
1112 if (!path)
1113 return -ENOMEM;
1114 path->leave_spinning = 1;
1115
1116 block_rsv = trans->block_rsv;
1117 trans->block_rsv = &root->fs_info->delayed_block_rsv;
1118
1119 delayed_root = btrfs_get_delayed_root(root);
1120
1121 curr_node = btrfs_first_delayed_node(delayed_root);
1122 while (curr_node && (!count || (count && nr--))) {
1123 ret = __btrfs_commit_inode_delayed_items(trans, path,
1124 curr_node);
1125 if (ret) {
1126 btrfs_release_delayed_node(curr_node);
1127 curr_node = NULL;
1128 btrfs_abort_transaction(trans, root, ret);
1129 break;
1130 }
1131
1132 prev_node = curr_node;
1133 curr_node = btrfs_next_delayed_node(curr_node);
1134 btrfs_release_delayed_node(prev_node);
1135 }
1136
1137 if (curr_node)
1138 btrfs_release_delayed_node(curr_node);
1139 btrfs_free_path(path);
1140 trans->block_rsv = block_rsv;
1141
1142 return ret;
1143 }
1144
1145 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
1146 struct btrfs_root *root)
1147 {
1148 return __btrfs_run_delayed_items(trans, root, -1);
1149 }
1150
1151 int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans,
1152 struct btrfs_root *root, int nr)
1153 {
1154 return __btrfs_run_delayed_items(trans, root, nr);
1155 }
1156
1157 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
1158 struct inode *inode)
1159 {
1160 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1161 struct btrfs_path *path;
1162 struct btrfs_block_rsv *block_rsv;
1163 int ret;
1164
1165 if (!delayed_node)
1166 return 0;
1167
1168 mutex_lock(&delayed_node->mutex);
1169 if (!delayed_node->count) {
1170 mutex_unlock(&delayed_node->mutex);
1171 btrfs_release_delayed_node(delayed_node);
1172 return 0;
1173 }
1174 mutex_unlock(&delayed_node->mutex);
1175
1176 path = btrfs_alloc_path();
1177 if (!path)
1178 return -ENOMEM;
1179 path->leave_spinning = 1;
1180
1181 block_rsv = trans->block_rsv;
1182 trans->block_rsv = &delayed_node->root->fs_info->delayed_block_rsv;
1183
1184 ret = __btrfs_commit_inode_delayed_items(trans, path, delayed_node);
1185
1186 btrfs_release_delayed_node(delayed_node);
1187 btrfs_free_path(path);
1188 trans->block_rsv = block_rsv;
1189
1190 return ret;
1191 }
1192
1193 int btrfs_commit_inode_delayed_inode(struct inode *inode)
1194 {
1195 struct btrfs_trans_handle *trans;
1196 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1197 struct btrfs_path *path;
1198 struct btrfs_block_rsv *block_rsv;
1199 int ret;
1200
1201 if (!delayed_node)
1202 return 0;
1203
1204 mutex_lock(&delayed_node->mutex);
1205 if (!delayed_node->inode_dirty) {
1206 mutex_unlock(&delayed_node->mutex);
1207 btrfs_release_delayed_node(delayed_node);
1208 return 0;
1209 }
1210 mutex_unlock(&delayed_node->mutex);
1211
1212 trans = btrfs_join_transaction(delayed_node->root);
1213 if (IS_ERR(trans)) {
1214 ret = PTR_ERR(trans);
1215 goto out;
1216 }
1217
1218 path = btrfs_alloc_path();
1219 if (!path) {
1220 ret = -ENOMEM;
1221 goto trans_out;
1222 }
1223 path->leave_spinning = 1;
1224
1225 block_rsv = trans->block_rsv;
1226 trans->block_rsv = &delayed_node->root->fs_info->delayed_block_rsv;
1227
1228 mutex_lock(&delayed_node->mutex);
1229 if (delayed_node->inode_dirty)
1230 ret = __btrfs_update_delayed_inode(trans, delayed_node->root,
1231 path, delayed_node);
1232 else
1233 ret = 0;
1234 mutex_unlock(&delayed_node->mutex);
1235
1236 btrfs_free_path(path);
1237 trans->block_rsv = block_rsv;
1238 trans_out:
1239 btrfs_end_transaction(trans, delayed_node->root);
1240 btrfs_btree_balance_dirty(delayed_node->root);
1241 out:
1242 btrfs_release_delayed_node(delayed_node);
1243
1244 return ret;
1245 }
1246
1247 void btrfs_remove_delayed_node(struct inode *inode)
1248 {
1249 struct btrfs_delayed_node *delayed_node;
1250
1251 delayed_node = ACCESS_ONCE(BTRFS_I(inode)->delayed_node);
1252 if (!delayed_node)
1253 return;
1254
1255 BTRFS_I(inode)->delayed_node = NULL;
1256 btrfs_release_delayed_node(delayed_node);
1257 }
1258
1259 struct btrfs_async_delayed_work {
1260 struct btrfs_delayed_root *delayed_root;
1261 int nr;
1262 struct btrfs_work work;
1263 };
1264
1265 static void btrfs_async_run_delayed_root(struct btrfs_work *work)
1266 {
1267 struct btrfs_async_delayed_work *async_work;
1268 struct btrfs_delayed_root *delayed_root;
1269 struct btrfs_trans_handle *trans;
1270 struct btrfs_path *path;
1271 struct btrfs_delayed_node *delayed_node = NULL;
1272 struct btrfs_root *root;
1273 struct btrfs_block_rsv *block_rsv;
1274 int total_done = 0;
1275
1276 async_work = container_of(work, struct btrfs_async_delayed_work, work);
1277 delayed_root = async_work->delayed_root;
1278
1279 path = btrfs_alloc_path();
1280 if (!path)
1281 goto out;
1282
1283 again:
1284 if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND / 2)
1285 goto free_path;
1286
1287 delayed_node = btrfs_first_prepared_delayed_node(delayed_root);
1288 if (!delayed_node)
1289 goto free_path;
1290
1291 path->leave_spinning = 1;
1292 root = delayed_node->root;
1293
1294 trans = btrfs_join_transaction(root);
1295 if (IS_ERR(trans))
1296 goto release_path;
1297
1298 block_rsv = trans->block_rsv;
1299 trans->block_rsv = &root->fs_info->delayed_block_rsv;
1300
1301 __btrfs_commit_inode_delayed_items(trans, path, delayed_node);
1302 /*
1303 * Maybe new delayed items have been inserted, so we need requeue
1304 * the work. Besides that, we must dequeue the empty delayed nodes
1305 * to avoid the race between delayed items balance and the worker.
1306 * The race like this:
1307 * Task1 Worker thread
1308 * count == 0, needn't requeue
1309 * also needn't insert the
1310 * delayed node into prepare
1311 * list again.
1312 * add lots of delayed items
1313 * queue the delayed node
1314 * already in the list,
1315 * and not in the prepare
1316 * list, it means the delayed
1317 * node is being dealt with
1318 * by the worker.
1319 * do delayed items balance
1320 * the delayed node is being
1321 * dealt with by the worker
1322 * now, just wait.
1323 * the worker goto idle.
1324 * Task1 will sleep until the transaction is commited.
1325 */
1326 mutex_lock(&delayed_node->mutex);
1327 btrfs_dequeue_delayed_node(root->fs_info->delayed_root, delayed_node);
1328 mutex_unlock(&delayed_node->mutex);
1329
1330 trans->block_rsv = block_rsv;
1331 btrfs_end_transaction_dmeta(trans, root);
1332 btrfs_btree_balance_dirty_nodelay(root);
1333
1334 release_path:
1335 btrfs_release_path(path);
1336 total_done++;
1337
1338 btrfs_release_prepared_delayed_node(delayed_node);
1339 if (async_work->nr == 0 || total_done < async_work->nr)
1340 goto again;
1341
1342 free_path:
1343 btrfs_free_path(path);
1344 out:
1345 wake_up(&delayed_root->wait);
1346 kfree(async_work);
1347 }
1348
1349
1350 static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
1351 struct btrfs_root *root, int nr)
1352 {
1353 struct btrfs_async_delayed_work *async_work;
1354
1355 if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
1356 return 0;
1357
1358 async_work = kmalloc(sizeof(*async_work), GFP_NOFS);
1359 if (!async_work)
1360 return -ENOMEM;
1361
1362 async_work->delayed_root = delayed_root;
1363 async_work->work.func = btrfs_async_run_delayed_root;
1364 async_work->work.flags = 0;
1365 async_work->nr = nr;
1366
1367 btrfs_queue_worker(&root->fs_info->delayed_workers, &async_work->work);
1368 return 0;
1369 }
1370
1371 void btrfs_assert_delayed_root_empty(struct btrfs_root *root)
1372 {
1373 struct btrfs_delayed_root *delayed_root;
1374 delayed_root = btrfs_get_delayed_root(root);
1375 WARN_ON(btrfs_first_delayed_node(delayed_root));
1376 }
1377
1378 static int refs_newer(struct btrfs_delayed_root *delayed_root,
1379 int seq, int count)
1380 {
1381 int val = atomic_read(&delayed_root->items_seq);
1382
1383 if (val < seq || val >= seq + count)
1384 return 1;
1385 return 0;
1386 }
1387
1388 void btrfs_balance_delayed_items(struct btrfs_root *root)
1389 {
1390 struct btrfs_delayed_root *delayed_root;
1391 int seq;
1392
1393 delayed_root = btrfs_get_delayed_root(root);
1394
1395 if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
1396 return;
1397
1398 seq = atomic_read(&delayed_root->items_seq);
1399
1400 if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
1401 int ret;
1402 DEFINE_WAIT(__wait);
1403
1404 ret = btrfs_wq_run_delayed_node(delayed_root, root, 0);
1405 if (ret)
1406 return;
1407
1408 while (1) {
1409 prepare_to_wait(&delayed_root->wait, &__wait,
1410 TASK_INTERRUPTIBLE);
1411
1412 if (refs_newer(delayed_root, seq,
1413 BTRFS_DELAYED_BATCH) ||
1414 atomic_read(&delayed_root->items) <
1415 BTRFS_DELAYED_BACKGROUND) {
1416 break;
1417 }
1418 if (!signal_pending(current))
1419 schedule();
1420 else
1421 break;
1422 }
1423 finish_wait(&delayed_root->wait, &__wait);
1424 }
1425
1426 btrfs_wq_run_delayed_node(delayed_root, root, BTRFS_DELAYED_BATCH);
1427 }
1428
1429 /* Will return 0 or -ENOMEM */
1430 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
1431 struct btrfs_root *root, const char *name,
1432 int name_len, struct inode *dir,
1433 struct btrfs_disk_key *disk_key, u8 type,
1434 u64 index)
1435 {
1436 struct btrfs_delayed_node *delayed_node;
1437 struct btrfs_delayed_item *delayed_item;
1438 struct btrfs_dir_item *dir_item;
1439 int ret;
1440
1441 delayed_node = btrfs_get_or_create_delayed_node(dir);
1442 if (IS_ERR(delayed_node))
1443 return PTR_ERR(delayed_node);
1444
1445 delayed_item = btrfs_alloc_delayed_item(sizeof(*dir_item) + name_len);
1446 if (!delayed_item) {
1447 ret = -ENOMEM;
1448 goto release_node;
1449 }
1450
1451 delayed_item->key.objectid = btrfs_ino(dir);
1452 btrfs_set_key_type(&delayed_item->key, BTRFS_DIR_INDEX_KEY);
1453 delayed_item->key.offset = index;
1454
1455 dir_item = (struct btrfs_dir_item *)delayed_item->data;
1456 dir_item->location = *disk_key;
1457 btrfs_set_stack_dir_transid(dir_item, trans->transid);
1458 btrfs_set_stack_dir_data_len(dir_item, 0);
1459 btrfs_set_stack_dir_name_len(dir_item, name_len);
1460 btrfs_set_stack_dir_type(dir_item, type);
1461 memcpy((char *)(dir_item + 1), name, name_len);
1462
1463 ret = btrfs_delayed_item_reserve_metadata(trans, root, delayed_item);
1464 /*
1465 * we have reserved enough space when we start a new transaction,
1466 * so reserving metadata failure is impossible
1467 */
1468 BUG_ON(ret);
1469
1470
1471 mutex_lock(&delayed_node->mutex);
1472 ret = __btrfs_add_delayed_insertion_item(delayed_node, delayed_item);
1473 if (unlikely(ret)) {
1474 printk(KERN_ERR "err add delayed dir index item(name: %.*s) "
1475 "into the insertion tree of the delayed node"
1476 "(root id: %llu, inode id: %llu, errno: %d)\n",
1477 name_len, name, delayed_node->root->objectid,
1478 delayed_node->inode_id, ret);
1479 BUG();
1480 }
1481 mutex_unlock(&delayed_node->mutex);
1482
1483 release_node:
1484 btrfs_release_delayed_node(delayed_node);
1485 return ret;
1486 }
1487
1488 static int btrfs_delete_delayed_insertion_item(struct btrfs_root *root,
1489 struct btrfs_delayed_node *node,
1490 struct btrfs_key *key)
1491 {
1492 struct btrfs_delayed_item *item;
1493
1494 mutex_lock(&node->mutex);
1495 item = __btrfs_lookup_delayed_insertion_item(node, key);
1496 if (!item) {
1497 mutex_unlock(&node->mutex);
1498 return 1;
1499 }
1500
1501 btrfs_delayed_item_release_metadata(root, item);
1502 btrfs_release_delayed_item(item);
1503 mutex_unlock(&node->mutex);
1504 return 0;
1505 }
1506
1507 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
1508 struct btrfs_root *root, struct inode *dir,
1509 u64 index)
1510 {
1511 struct btrfs_delayed_node *node;
1512 struct btrfs_delayed_item *item;
1513 struct btrfs_key item_key;
1514 int ret;
1515
1516 node = btrfs_get_or_create_delayed_node(dir);
1517 if (IS_ERR(node))
1518 return PTR_ERR(node);
1519
1520 item_key.objectid = btrfs_ino(dir);
1521 btrfs_set_key_type(&item_key, BTRFS_DIR_INDEX_KEY);
1522 item_key.offset = index;
1523
1524 ret = btrfs_delete_delayed_insertion_item(root, node, &item_key);
1525 if (!ret)
1526 goto end;
1527
1528 item = btrfs_alloc_delayed_item(0);
1529 if (!item) {
1530 ret = -ENOMEM;
1531 goto end;
1532 }
1533
1534 item->key = item_key;
1535
1536 ret = btrfs_delayed_item_reserve_metadata(trans, root, item);
1537 /*
1538 * we have reserved enough space when we start a new transaction,
1539 * so reserving metadata failure is impossible.
1540 */
1541 BUG_ON(ret);
1542
1543 mutex_lock(&node->mutex);
1544 ret = __btrfs_add_delayed_deletion_item(node, item);
1545 if (unlikely(ret)) {
1546 printk(KERN_ERR "err add delayed dir index item(index: %llu) "
1547 "into the deletion tree of the delayed node"
1548 "(root id: %llu, inode id: %llu, errno: %d)\n",
1549 index, node->root->objectid, node->inode_id,
1550 ret);
1551 BUG();
1552 }
1553 mutex_unlock(&node->mutex);
1554 end:
1555 btrfs_release_delayed_node(node);
1556 return ret;
1557 }
1558
1559 int btrfs_inode_delayed_dir_index_count(struct inode *inode)
1560 {
1561 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1562
1563 if (!delayed_node)
1564 return -ENOENT;
1565
1566 /*
1567 * Since we have held i_mutex of this directory, it is impossible that
1568 * a new directory index is added into the delayed node and index_cnt
1569 * is updated now. So we needn't lock the delayed node.
1570 */
1571 if (!delayed_node->index_cnt) {
1572 btrfs_release_delayed_node(delayed_node);
1573 return -EINVAL;
1574 }
1575
1576 BTRFS_I(inode)->index_cnt = delayed_node->index_cnt;
1577 btrfs_release_delayed_node(delayed_node);
1578 return 0;
1579 }
1580
1581 void btrfs_get_delayed_items(struct inode *inode, struct list_head *ins_list,
1582 struct list_head *del_list)
1583 {
1584 struct btrfs_delayed_node *delayed_node;
1585 struct btrfs_delayed_item *item;
1586
1587 delayed_node = btrfs_get_delayed_node(inode);
1588 if (!delayed_node)
1589 return;
1590
1591 mutex_lock(&delayed_node->mutex);
1592 item = __btrfs_first_delayed_insertion_item(delayed_node);
1593 while (item) {
1594 atomic_inc(&item->refs);
1595 list_add_tail(&item->readdir_list, ins_list);
1596 item = __btrfs_next_delayed_item(item);
1597 }
1598
1599 item = __btrfs_first_delayed_deletion_item(delayed_node);
1600 while (item) {
1601 atomic_inc(&item->refs);
1602 list_add_tail(&item->readdir_list, del_list);
1603 item = __btrfs_next_delayed_item(item);
1604 }
1605 mutex_unlock(&delayed_node->mutex);
1606 /*
1607 * This delayed node is still cached in the btrfs inode, so refs
1608 * must be > 1 now, and we needn't check it is going to be freed
1609 * or not.
1610 *
1611 * Besides that, this function is used to read dir, we do not
1612 * insert/delete delayed items in this period. So we also needn't
1613 * requeue or dequeue this delayed node.
1614 */
1615 atomic_dec(&delayed_node->refs);
1616 }
1617
1618 void btrfs_put_delayed_items(struct list_head *ins_list,
1619 struct list_head *del_list)
1620 {
1621 struct btrfs_delayed_item *curr, *next;
1622
1623 list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
1624 list_del(&curr->readdir_list);
1625 if (atomic_dec_and_test(&curr->refs))
1626 kfree(curr);
1627 }
1628
1629 list_for_each_entry_safe(curr, next, del_list, readdir_list) {
1630 list_del(&curr->readdir_list);
1631 if (atomic_dec_and_test(&curr->refs))
1632 kfree(curr);
1633 }
1634 }
1635
1636 int btrfs_should_delete_dir_index(struct list_head *del_list,
1637 u64 index)
1638 {
1639 struct btrfs_delayed_item *curr, *next;
1640 int ret;
1641
1642 if (list_empty(del_list))
1643 return 0;
1644
1645 list_for_each_entry_safe(curr, next, del_list, readdir_list) {
1646 if (curr->key.offset > index)
1647 break;
1648
1649 list_del(&curr->readdir_list);
1650 ret = (curr->key.offset == index);
1651
1652 if (atomic_dec_and_test(&curr->refs))
1653 kfree(curr);
1654
1655 if (ret)
1656 return 1;
1657 else
1658 continue;
1659 }
1660 return 0;
1661 }
1662
1663 /*
1664 * btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree
1665 *
1666 */
1667 int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
1668 struct list_head *ins_list)
1669 {
1670 struct btrfs_dir_item *di;
1671 struct btrfs_delayed_item *curr, *next;
1672 struct btrfs_key location;
1673 char *name;
1674 int name_len;
1675 int over = 0;
1676 unsigned char d_type;
1677
1678 if (list_empty(ins_list))
1679 return 0;
1680
1681 /*
1682 * Changing the data of the delayed item is impossible. So
1683 * we needn't lock them. And we have held i_mutex of the
1684 * directory, nobody can delete any directory indexes now.
1685 */
1686 list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
1687 list_del(&curr->readdir_list);
1688
1689 if (curr->key.offset < ctx->pos) {
1690 if (atomic_dec_and_test(&curr->refs))
1691 kfree(curr);
1692 continue;
1693 }
1694
1695 ctx->pos = curr->key.offset;
1696
1697 di = (struct btrfs_dir_item *)curr->data;
1698 name = (char *)(di + 1);
1699 name_len = btrfs_stack_dir_name_len(di);
1700
1701 d_type = btrfs_filetype_table[di->type];
1702 btrfs_disk_key_to_cpu(&location, &di->location);
1703
1704 over = !dir_emit(ctx, name, name_len,
1705 location.objectid, d_type);
1706
1707 if (atomic_dec_and_test(&curr->refs))
1708 kfree(curr);
1709
1710 if (over)
1711 return 1;
1712 }
1713 return 0;
1714 }
1715
1716 static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
1717 struct btrfs_inode_item *inode_item,
1718 struct inode *inode)
1719 {
1720 btrfs_set_stack_inode_uid(inode_item, i_uid_read(inode));
1721 btrfs_set_stack_inode_gid(inode_item, i_gid_read(inode));
1722 btrfs_set_stack_inode_size(inode_item, BTRFS_I(inode)->disk_i_size);
1723 btrfs_set_stack_inode_mode(inode_item, inode->i_mode);
1724 btrfs_set_stack_inode_nlink(inode_item, inode->i_nlink);
1725 btrfs_set_stack_inode_nbytes(inode_item, inode_get_bytes(inode));
1726 btrfs_set_stack_inode_generation(inode_item,
1727 BTRFS_I(inode)->generation);
1728 btrfs_set_stack_inode_sequence(inode_item, inode->i_version);
1729 btrfs_set_stack_inode_transid(inode_item, trans->transid);
1730 btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
1731 btrfs_set_stack_inode_flags(inode_item, BTRFS_I(inode)->flags);
1732 btrfs_set_stack_inode_block_group(inode_item, 0);
1733
1734 btrfs_set_stack_timespec_sec(btrfs_inode_atime(inode_item),
1735 inode->i_atime.tv_sec);
1736 btrfs_set_stack_timespec_nsec(btrfs_inode_atime(inode_item),
1737 inode->i_atime.tv_nsec);
1738
1739 btrfs_set_stack_timespec_sec(btrfs_inode_mtime(inode_item),
1740 inode->i_mtime.tv_sec);
1741 btrfs_set_stack_timespec_nsec(btrfs_inode_mtime(inode_item),
1742 inode->i_mtime.tv_nsec);
1743
1744 btrfs_set_stack_timespec_sec(btrfs_inode_ctime(inode_item),
1745 inode->i_ctime.tv_sec);
1746 btrfs_set_stack_timespec_nsec(btrfs_inode_ctime(inode_item),
1747 inode->i_ctime.tv_nsec);
1748 }
1749
1750 int btrfs_fill_inode(struct inode *inode, u32 *rdev)
1751 {
1752 struct btrfs_delayed_node *delayed_node;
1753 struct btrfs_inode_item *inode_item;
1754 struct btrfs_timespec *tspec;
1755
1756 delayed_node = btrfs_get_delayed_node(inode);
1757 if (!delayed_node)
1758 return -ENOENT;
1759
1760 mutex_lock(&delayed_node->mutex);
1761 if (!delayed_node->inode_dirty) {
1762 mutex_unlock(&delayed_node->mutex);
1763 btrfs_release_delayed_node(delayed_node);
1764 return -ENOENT;
1765 }
1766
1767 inode_item = &delayed_node->inode_item;
1768
1769 i_uid_write(inode, btrfs_stack_inode_uid(inode_item));
1770 i_gid_write(inode, btrfs_stack_inode_gid(inode_item));
1771 btrfs_i_size_write(inode, btrfs_stack_inode_size(inode_item));
1772 inode->i_mode = btrfs_stack_inode_mode(inode_item);
1773 set_nlink(inode, btrfs_stack_inode_nlink(inode_item));
1774 inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
1775 BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
1776 inode->i_version = btrfs_stack_inode_sequence(inode_item);
1777 inode->i_rdev = 0;
1778 *rdev = btrfs_stack_inode_rdev(inode_item);
1779 BTRFS_I(inode)->flags = btrfs_stack_inode_flags(inode_item);
1780
1781 tspec = btrfs_inode_atime(inode_item);
1782 inode->i_atime.tv_sec = btrfs_stack_timespec_sec(tspec);
1783 inode->i_atime.tv_nsec = btrfs_stack_timespec_nsec(tspec);
1784
1785 tspec = btrfs_inode_mtime(inode_item);
1786 inode->i_mtime.tv_sec = btrfs_stack_timespec_sec(tspec);
1787 inode->i_mtime.tv_nsec = btrfs_stack_timespec_nsec(tspec);
1788
1789 tspec = btrfs_inode_ctime(inode_item);
1790 inode->i_ctime.tv_sec = btrfs_stack_timespec_sec(tspec);
1791 inode->i_ctime.tv_nsec = btrfs_stack_timespec_nsec(tspec);
1792
1793 inode->i_generation = BTRFS_I(inode)->generation;
1794 BTRFS_I(inode)->index_cnt = (u64)-1;
1795
1796 mutex_unlock(&delayed_node->mutex);
1797 btrfs_release_delayed_node(delayed_node);
1798 return 0;
1799 }
1800
1801 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
1802 struct btrfs_root *root, struct inode *inode)
1803 {
1804 struct btrfs_delayed_node *delayed_node;
1805 int ret = 0;
1806
1807 delayed_node = btrfs_get_or_create_delayed_node(inode);
1808 if (IS_ERR(delayed_node))
1809 return PTR_ERR(delayed_node);
1810
1811 mutex_lock(&delayed_node->mutex);
1812 if (delayed_node->inode_dirty) {
1813 fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
1814 goto release_node;
1815 }
1816
1817 ret = btrfs_delayed_inode_reserve_metadata(trans, root, inode,
1818 delayed_node);
1819 if (ret)
1820 goto release_node;
1821
1822 fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
1823 delayed_node->inode_dirty = 1;
1824 delayed_node->count++;
1825 atomic_inc(&root->fs_info->delayed_root->items);
1826 release_node:
1827 mutex_unlock(&delayed_node->mutex);
1828 btrfs_release_delayed_node(delayed_node);
1829 return ret;
1830 }
1831
1832 static void __btrfs_kill_delayed_node(struct btrfs_delayed_node *delayed_node)
1833 {
1834 struct btrfs_root *root = delayed_node->root;
1835 struct btrfs_delayed_item *curr_item, *prev_item;
1836
1837 mutex_lock(&delayed_node->mutex);
1838 curr_item = __btrfs_first_delayed_insertion_item(delayed_node);
1839 while (curr_item) {
1840 btrfs_delayed_item_release_metadata(root, curr_item);
1841 prev_item = curr_item;
1842 curr_item = __btrfs_next_delayed_item(prev_item);
1843 btrfs_release_delayed_item(prev_item);
1844 }
1845
1846 curr_item = __btrfs_first_delayed_deletion_item(delayed_node);
1847 while (curr_item) {
1848 btrfs_delayed_item_release_metadata(root, curr_item);
1849 prev_item = curr_item;
1850 curr_item = __btrfs_next_delayed_item(prev_item);
1851 btrfs_release_delayed_item(prev_item);
1852 }
1853
1854 if (delayed_node->inode_dirty) {
1855 btrfs_delayed_inode_release_metadata(root, delayed_node);
1856 btrfs_release_delayed_inode(delayed_node);
1857 }
1858 mutex_unlock(&delayed_node->mutex);
1859 }
1860
1861 void btrfs_kill_delayed_inode_items(struct inode *inode)
1862 {
1863 struct btrfs_delayed_node *delayed_node;
1864
1865 delayed_node = btrfs_get_delayed_node(inode);
1866 if (!delayed_node)
1867 return;
1868
1869 __btrfs_kill_delayed_node(delayed_node);
1870 btrfs_release_delayed_node(delayed_node);
1871 }
1872
1873 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root)
1874 {
1875 u64 inode_id = 0;
1876 struct btrfs_delayed_node *delayed_nodes[8];
1877 int i, n;
1878
1879 while (1) {
1880 spin_lock(&root->inode_lock);
1881 n = radix_tree_gang_lookup(&root->delayed_nodes_tree,
1882 (void **)delayed_nodes, inode_id,
1883 ARRAY_SIZE(delayed_nodes));
1884 if (!n) {
1885 spin_unlock(&root->inode_lock);
1886 break;
1887 }
1888
1889 inode_id = delayed_nodes[n - 1]->inode_id + 1;
1890
1891 for (i = 0; i < n; i++)
1892 atomic_inc(&delayed_nodes[i]->refs);
1893 spin_unlock(&root->inode_lock);
1894
1895 for (i = 0; i < n; i++) {
1896 __btrfs_kill_delayed_node(delayed_nodes[i]);
1897 btrfs_release_delayed_node(delayed_nodes[i]);
1898 }
1899 }
1900 }
1901
1902 void btrfs_destroy_delayed_inodes(struct btrfs_root *root)
1903 {
1904 struct btrfs_delayed_root *delayed_root;
1905 struct btrfs_delayed_node *curr_node, *prev_node;
1906
1907 delayed_root = btrfs_get_delayed_root(root);
1908
1909 curr_node = btrfs_first_delayed_node(delayed_root);
1910 while (curr_node) {
1911 __btrfs_kill_delayed_node(curr_node);
1912
1913 prev_node = curr_node;
1914 curr_node = btrfs_next_delayed_node(curr_node);
1915 btrfs_release_delayed_node(prev_node);
1916 }
1917 }
1918
Linux with added FPC-III support