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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
25#define BTRFS_DELAYED_WRITEBACK 400
26#define BTRFS_DELAYED_BACKGROUND 100
27
28static struct kmem_cache *delayed_node_cache;
29
30int __init btrfs_delayed_inode_init(void)
31{
32 delayed_node_cache = kmem_cache_create("delayed_node",
33 sizeof(struct btrfs_delayed_node),
34 0,
35 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
36 NULL);
37 if (!delayed_node_cache)
38 return -ENOMEM;
39 return 0;
40}
41
42void btrfs_delayed_inode_exit(void)
43{
44 if (delayed_node_cache)
45 kmem_cache_destroy(delayed_node_cache);
46}
47
48static inline void btrfs_init_delayed_node(
49 struct btrfs_delayed_node *delayed_node,
50 struct btrfs_root *root, u64 inode_id)
51{
52 delayed_node->root = root;
53 delayed_node->inode_id = inode_id;
54 atomic_set(&delayed_node->refs, 0);
55 delayed_node->count = 0;
56 delayed_node->in_list = 0;
57 delayed_node->inode_dirty = 0;
58 delayed_node->ins_root = RB_ROOT;
59 delayed_node->del_root = RB_ROOT;
60 mutex_init(&delayed_node->mutex);
61 delayed_node->index_cnt = 0;
62 INIT_LIST_HEAD(&delayed_node->n_list);
63 INIT_LIST_HEAD(&delayed_node->p_list);
64 delayed_node->bytes_reserved = 0;
65}
66
67static inline int btrfs_is_continuous_delayed_item(
68 struct btrfs_delayed_item *item1,
69 struct btrfs_delayed_item *item2)
70{
71 if (item1->key.type == BTRFS_DIR_INDEX_KEY &&
72 item1->key.objectid == item2->key.objectid &&
73 item1->key.type == item2->key.type &&
74 item1->key.offset + 1 == item2->key.offset)
75 return 1;
76 return 0;
77}
78
79static inline struct btrfs_delayed_root *btrfs_get_delayed_root(
80 struct btrfs_root *root)
81{
82 return root->fs_info->delayed_root;
83}
84
85static struct btrfs_delayed_node *btrfs_get_delayed_node(struct inode *inode)
86{
87 struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
88 struct btrfs_root *root = btrfs_inode->root;
89 u64 ino = btrfs_ino(inode);
90 struct btrfs_delayed_node *node;
91
92 node = ACCESS_ONCE(btrfs_inode->delayed_node);
93 if (node) {
94 atomic_inc(&node->refs);
95 return node;
96 }
97
98 spin_lock(&root->inode_lock);
99 node = radix_tree_lookup(&root->delayed_nodes_tree, ino);
100 if (node) {
101 if (btrfs_inode->delayed_node) {
102 atomic_inc(&node->refs); /* can be accessed */
103 BUG_ON(btrfs_inode->delayed_node != node);
104 spin_unlock(&root->inode_lock);
105 return node;
106 }
107 btrfs_inode->delayed_node = node;
108 atomic_inc(&node->refs); /* can be accessed */
109 atomic_inc(&node->refs); /* cached in the inode */
110 spin_unlock(&root->inode_lock);
111 return node;
112 }
113 spin_unlock(&root->inode_lock);
114
115 return NULL;
116}
117
118static struct btrfs_delayed_node *btrfs_get_or_create_delayed_node(
119 struct inode *inode)
120{
121 struct btrfs_delayed_node *node;
122 struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
123 struct btrfs_root *root = btrfs_inode->root;
124 u64 ino = btrfs_ino(inode);
125 int ret;
126
127again:
128 node = btrfs_get_delayed_node(inode);
129 if (node)
130 return node;
131
132 node = kmem_cache_alloc(delayed_node_cache, GFP_NOFS);
133 if (!node)
134 return ERR_PTR(-ENOMEM);
135 btrfs_init_delayed_node(node, root, ino);
136
137 atomic_inc(&node->refs); /* cached in the btrfs inode */
138 atomic_inc(&node->refs); /* can be accessed */
139
140 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
141 if (ret) {
142 kmem_cache_free(delayed_node_cache, node);
143 return ERR_PTR(ret);
144 }
145
146 spin_lock(&root->inode_lock);
147 ret = radix_tree_insert(&root->delayed_nodes_tree, ino, node);
148 if (ret == -EEXIST) {
149 kmem_cache_free(delayed_node_cache, node);
150 spin_unlock(&root->inode_lock);
151 radix_tree_preload_end();
152 goto again;
153 }
154 btrfs_inode->delayed_node = node;
155 spin_unlock(&root->inode_lock);
156 radix_tree_preload_end();
157
158 return node;
159}
160
161/*
162 * Call it when holding delayed_node->mutex
163 *
164 * If mod = 1, add this node into the prepared list.
165 */
166static void btrfs_queue_delayed_node(struct btrfs_delayed_root *root,
167 struct btrfs_delayed_node *node,
168 int mod)
169{
170 spin_lock(&root->lock);
171 if (node->in_list) {
172 if (!list_empty(&node->p_list))
173 list_move_tail(&node->p_list, &root->prepare_list);
174 else if (mod)
175 list_add_tail(&node->p_list, &root->prepare_list);
176 } else {
177 list_add_tail(&node->n_list, &root->node_list);
178 list_add_tail(&node->p_list, &root->prepare_list);
179 atomic_inc(&node->refs); /* inserted into list */
180 root->nodes++;
181 node->in_list = 1;
182 }
183 spin_unlock(&root->lock);
184}
185
186/* Call it when holding delayed_node->mutex */
187static void btrfs_dequeue_delayed_node(struct btrfs_delayed_root *root,
188 struct btrfs_delayed_node *node)
189{
190 spin_lock(&root->lock);
191 if (node->in_list) {
192 root->nodes--;
193 atomic_dec(&node->refs); /* not in the list */
194 list_del_init(&node->n_list);
195 if (!list_empty(&node->p_list))
196 list_del_init(&node->p_list);
197 node->in_list = 0;
198 }
199 spin_unlock(&root->lock);
200}
201
202struct btrfs_delayed_node *btrfs_first_delayed_node(
203 struct btrfs_delayed_root *delayed_root)
204{
205 struct list_head *p;
206 struct btrfs_delayed_node *node = NULL;
207
208 spin_lock(&delayed_root->lock);
209 if (list_empty(&delayed_root->node_list))
210 goto out;
211
212 p = delayed_root->node_list.next;
213 node = list_entry(p, struct btrfs_delayed_node, n_list);
214 atomic_inc(&node->refs);
215out:
216 spin_unlock(&delayed_root->lock);
217
218 return node;
219}
220
221struct btrfs_delayed_node *btrfs_next_delayed_node(
222 struct btrfs_delayed_node *node)
223{
224 struct btrfs_delayed_root *delayed_root;
225 struct list_head *p;
226 struct btrfs_delayed_node *next = NULL;
227
228 delayed_root = node->root->fs_info->delayed_root;
229 spin_lock(&delayed_root->lock);
230 if (!node->in_list) { /* not in the list */
231 if (list_empty(&delayed_root->node_list))
232 goto out;
233 p = delayed_root->node_list.next;
234 } else if (list_is_last(&node->n_list, &delayed_root->node_list))
235 goto out;
236 else
237 p = node->n_list.next;
238
239 next = list_entry(p, struct btrfs_delayed_node, n_list);
240 atomic_inc(&next->refs);
241out:
242 spin_unlock(&delayed_root->lock);
243
244 return next;
245}
246
247static void __btrfs_release_delayed_node(
248 struct btrfs_delayed_node *delayed_node,
249 int mod)
250{
251 struct btrfs_delayed_root *delayed_root;
252
253 if (!delayed_node)
254 return;
255
256 delayed_root = delayed_node->root->fs_info->delayed_root;
257
258 mutex_lock(&delayed_node->mutex);
259 if (delayed_node->count)
260 btrfs_queue_delayed_node(delayed_root, delayed_node, mod);
261 else
262 btrfs_dequeue_delayed_node(delayed_root, delayed_node);
263 mutex_unlock(&delayed_node->mutex);
264
265 if (atomic_dec_and_test(&delayed_node->refs)) {
266 struct btrfs_root *root = delayed_node->root;
267 spin_lock(&root->inode_lock);
268 if (atomic_read(&delayed_node->refs) == 0) {
269 radix_tree_delete(&root->delayed_nodes_tree,
270 delayed_node->inode_id);
271 kmem_cache_free(delayed_node_cache, delayed_node);
272 }
273 spin_unlock(&root->inode_lock);
274 }
275}
276
277static inline void btrfs_release_delayed_node(struct btrfs_delayed_node *node)
278{
279 __btrfs_release_delayed_node(node, 0);
280}
281
282struct btrfs_delayed_node *btrfs_first_prepared_delayed_node(
283 struct btrfs_delayed_root *delayed_root)
284{
285 struct list_head *p;
286 struct btrfs_delayed_node *node = NULL;
287
288 spin_lock(&delayed_root->lock);
289 if (list_empty(&delayed_root->prepare_list))
290 goto out;
291
292 p = delayed_root->prepare_list.next;
293 list_del_init(p);
294 node = list_entry(p, struct btrfs_delayed_node, p_list);
295 atomic_inc(&node->refs);
296out:
297 spin_unlock(&delayed_root->lock);
298
299 return node;
300}
301
302static inline void btrfs_release_prepared_delayed_node(
303 struct btrfs_delayed_node *node)
304{
305 __btrfs_release_delayed_node(node, 1);
306}
307
308struct btrfs_delayed_item *btrfs_alloc_delayed_item(u32 data_len)
309{
310 struct btrfs_delayed_item *item;
311 item = kmalloc(sizeof(*item) + data_len, GFP_NOFS);
312 if (item) {
313 item->data_len = data_len;
314 item->ins_or_del = 0;
315 item->bytes_reserved = 0;
316 item->delayed_node = NULL;
317 atomic_set(&item->refs, 1);
318 }
319 return item;
320}
321
322/*
323 * __btrfs_lookup_delayed_item - look up the delayed item by key
324 * @delayed_node: pointer to the delayed node
325 * @key: the key to look up
326 * @prev: used to store the prev item if the right item isn't found
327 * @next: used to store the next item if the right item isn't found
328 *
329 * Note: if we don't find the right item, we will return the prev item and
330 * the next item.
331 */
332static struct btrfs_delayed_item *__btrfs_lookup_delayed_item(
333 struct rb_root *root,
334 struct btrfs_key *key,
335 struct btrfs_delayed_item **prev,
336 struct btrfs_delayed_item **next)
337{
338 struct rb_node *node, *prev_node = NULL;
339 struct btrfs_delayed_item *delayed_item = NULL;
340 int ret = 0;
341
342 node = root->rb_node;
343
344 while (node) {
345 delayed_item = rb_entry(node, struct btrfs_delayed_item,
346 rb_node);
347 prev_node = node;
348 ret = btrfs_comp_cpu_keys(&delayed_item->key, key);
349 if (ret < 0)
350 node = node->rb_right;
351 else if (ret > 0)
352 node = node->rb_left;
353 else
354 return delayed_item;
355 }
356
357 if (prev) {
358 if (!prev_node)
359 *prev = NULL;
360 else if (ret < 0)
361 *prev = delayed_item;
362 else if ((node = rb_prev(prev_node)) != NULL) {
363 *prev = rb_entry(node, struct btrfs_delayed_item,
364 rb_node);
365 } else
366 *prev = NULL;
367 }
368
369 if (next) {
370 if (!prev_node)
371 *next = NULL;
372 else if (ret > 0)
373 *next = delayed_item;
374 else if ((node = rb_next(prev_node)) != NULL) {
375 *next = rb_entry(node, struct btrfs_delayed_item,
376 rb_node);
377 } else
378 *next = NULL;
379 }
380 return NULL;
381}
382
383struct btrfs_delayed_item *__btrfs_lookup_delayed_insertion_item(
384 struct btrfs_delayed_node *delayed_node,
385 struct btrfs_key *key)
386{
387 struct btrfs_delayed_item *item;
388
389 item = __btrfs_lookup_delayed_item(&delayed_node->ins_root, key,
390 NULL, NULL);
391 return item;
392}
393
394struct btrfs_delayed_item *__btrfs_lookup_delayed_deletion_item(
395 struct btrfs_delayed_node *delayed_node,
396 struct btrfs_key *key)
397{
398 struct btrfs_delayed_item *item;
399
400 item = __btrfs_lookup_delayed_item(&delayed_node->del_root, key,
401 NULL, NULL);
402 return item;
403}
404
405struct btrfs_delayed_item *__btrfs_search_delayed_insertion_item(
406 struct btrfs_delayed_node *delayed_node,
407 struct btrfs_key *key)
408{
409 struct btrfs_delayed_item *item, *next;
410
411 item = __btrfs_lookup_delayed_item(&delayed_node->ins_root, key,
412 NULL, &next);
413 if (!item)
414 item = next;
415
416 return item;
417}
418
419struct btrfs_delayed_item *__btrfs_search_delayed_deletion_item(
420 struct btrfs_delayed_node *delayed_node,
421 struct btrfs_key *key)
422{
423 struct btrfs_delayed_item *item, *next;
424
425 item = __btrfs_lookup_delayed_item(&delayed_node->del_root, key,
426 NULL, &next);
427 if (!item)
428 item = next;
429
430 return item;
431}
432
433static int __btrfs_add_delayed_item(struct btrfs_delayed_node *delayed_node,
434 struct btrfs_delayed_item *ins,
435 int action)
436{
437 struct rb_node **p, *node;
438 struct rb_node *parent_node = NULL;
439 struct rb_root *root;
440 struct btrfs_delayed_item *item;
441 int cmp;
442
443 if (action == BTRFS_DELAYED_INSERTION_ITEM)
444 root = &delayed_node->ins_root;
445 else if (action == BTRFS_DELAYED_DELETION_ITEM)
446 root = &delayed_node->del_root;
447 else
448 BUG();
449 p = &root->rb_node;
450 node = &ins->rb_node;
451
452 while (*p) {
453 parent_node = *p;
454 item = rb_entry(parent_node, struct btrfs_delayed_item,
455 rb_node);
456
457 cmp = btrfs_comp_cpu_keys(&item->key, &ins->key);
458 if (cmp < 0)
459 p = &(*p)->rb_right;
460 else if (cmp > 0)
461 p = &(*p)->rb_left;
462 else
463 return -EEXIST;
464 }
465
466 rb_link_node(node, parent_node, p);
467 rb_insert_color(node, root);
468 ins->delayed_node = delayed_node;
469 ins->ins_or_del = action;
470
471 if (ins->key.type == BTRFS_DIR_INDEX_KEY &&
472 action == BTRFS_DELAYED_INSERTION_ITEM &&
473 ins->key.offset >= delayed_node->index_cnt)
474 delayed_node->index_cnt = ins->key.offset + 1;
475
476 delayed_node->count++;
477 atomic_inc(&delayed_node->root->fs_info->delayed_root->items);
478 return 0;
479}
480
481static int __btrfs_add_delayed_insertion_item(struct btrfs_delayed_node *node,
482 struct btrfs_delayed_item *item)
483{
484 return __btrfs_add_delayed_item(node, item,
485 BTRFS_DELAYED_INSERTION_ITEM);
486}
487
488static int __btrfs_add_delayed_deletion_item(struct btrfs_delayed_node *node,
489 struct btrfs_delayed_item *item)
490{
491 return __btrfs_add_delayed_item(node, item,
492 BTRFS_DELAYED_DELETION_ITEM);
493}
494
495static void __btrfs_remove_delayed_item(struct btrfs_delayed_item *delayed_item)
496{
497 struct rb_root *root;
498 struct btrfs_delayed_root *delayed_root;
499
500 delayed_root = delayed_item->delayed_node->root->fs_info->delayed_root;
501
502 BUG_ON(!delayed_root);
503 BUG_ON(delayed_item->ins_or_del != BTRFS_DELAYED_DELETION_ITEM &&
504 delayed_item->ins_or_del != BTRFS_DELAYED_INSERTION_ITEM);
505
506 if (delayed_item->ins_or_del == BTRFS_DELAYED_INSERTION_ITEM)
507 root = &delayed_item->delayed_node->ins_root;
508 else
509 root = &delayed_item->delayed_node->del_root;
510
511 rb_erase(&delayed_item->rb_node, root);
512 delayed_item->delayed_node->count--;
513 atomic_dec(&delayed_root->items);
514 if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND &&
515 waitqueue_active(&delayed_root->wait))
516 wake_up(&delayed_root->wait);
517}
518
519static void btrfs_release_delayed_item(struct btrfs_delayed_item *item)
520{
521 if (item) {
522 __btrfs_remove_delayed_item(item);
523 if (atomic_dec_and_test(&item->refs))
524 kfree(item);
525 }
526}
527
528struct btrfs_delayed_item *__btrfs_first_delayed_insertion_item(
529 struct btrfs_delayed_node *delayed_node)
530{
531 struct rb_node *p;
532 struct btrfs_delayed_item *item = NULL;
533
534 p = rb_first(&delayed_node->ins_root);
535 if (p)
536 item = rb_entry(p, struct btrfs_delayed_item, rb_node);
537
538 return item;
539}
540
541struct btrfs_delayed_item *__btrfs_first_delayed_deletion_item(
542 struct btrfs_delayed_node *delayed_node)
543{
544 struct rb_node *p;
545 struct btrfs_delayed_item *item = NULL;
546
547 p = rb_first(&delayed_node->del_root);
548 if (p)
549 item = rb_entry(p, struct btrfs_delayed_item, rb_node);
550
551 return item;
552}
553
554struct btrfs_delayed_item *__btrfs_next_delayed_item(
555 struct btrfs_delayed_item *item)
556{
557 struct rb_node *p;
558 struct btrfs_delayed_item *next = NULL;
559
560 p = rb_next(&item->rb_node);
561 if (p)
562 next = rb_entry(p, struct btrfs_delayed_item, rb_node);
563
564 return next;
565}
566
567static inline struct btrfs_root *btrfs_get_fs_root(struct btrfs_root *root,
568 u64 root_id)
569{
570 struct btrfs_key root_key;
571
572 if (root->objectid == root_id)
573 return root;
574
575 root_key.objectid = root_id;
576 root_key.type = BTRFS_ROOT_ITEM_KEY;
577 root_key.offset = (u64)-1;
578 return btrfs_read_fs_root_no_name(root->fs_info, &root_key);
579}
580
581static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans,
582 struct btrfs_root *root,
583 struct btrfs_delayed_item *item)
584{
585 struct btrfs_block_rsv *src_rsv;
586 struct btrfs_block_rsv *dst_rsv;
587 u64 num_bytes;
588 int ret;
589
590 if (!trans->bytes_reserved)
591 return 0;
592
593 src_rsv = trans->block_rsv;
594 dst_rsv = &root->fs_info->global_block_rsv;
595
596 num_bytes = btrfs_calc_trans_metadata_size(root, 1);
597 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
598 if (!ret)
599 item->bytes_reserved = num_bytes;
600
601 return ret;
602}
603
604static void btrfs_delayed_item_release_metadata(struct btrfs_root *root,
605 struct btrfs_delayed_item *item)
606{
607 struct btrfs_block_rsv *rsv;
608
609 if (!item->bytes_reserved)
610 return;
611
612 rsv = &root->fs_info->global_block_rsv;
613 btrfs_block_rsv_release(root, rsv,
614 item->bytes_reserved);
615}
616
617static int btrfs_delayed_inode_reserve_metadata(
618 struct btrfs_trans_handle *trans,
619 struct btrfs_root *root,
620 struct btrfs_delayed_node *node)
621{
622 struct btrfs_block_rsv *src_rsv;
623 struct btrfs_block_rsv *dst_rsv;
624 u64 num_bytes;
625 int ret;
626
627 if (!trans->bytes_reserved)
628 return 0;
629
630 src_rsv = trans->block_rsv;
631 dst_rsv = &root->fs_info->global_block_rsv;
632
633 num_bytes = btrfs_calc_trans_metadata_size(root, 1);
634 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
635 if (!ret)
636 node->bytes_reserved = num_bytes;
637
638 return ret;
639}
640
641static void btrfs_delayed_inode_release_metadata(struct btrfs_root *root,
642 struct btrfs_delayed_node *node)
643{
644 struct btrfs_block_rsv *rsv;
645
646 if (!node->bytes_reserved)
647 return;
648
649 rsv = &root->fs_info->global_block_rsv;
650 btrfs_block_rsv_release(root, rsv,
651 node->bytes_reserved);
652 node->bytes_reserved = 0;
653}
654
655/*
656 * This helper will insert some continuous items into the same leaf according
657 * to the free space of the leaf.
658 */
659static int btrfs_batch_insert_items(struct btrfs_trans_handle *trans,
660 struct btrfs_root *root,
661 struct btrfs_path *path,
662 struct btrfs_delayed_item *item)
663{
664 struct btrfs_delayed_item *curr, *next;
665 int free_space;
666 int total_data_size = 0, total_size = 0;
667 struct extent_buffer *leaf;
668 char *data_ptr;
669 struct btrfs_key *keys;
670 u32 *data_size;
671 struct list_head head;
672 int slot;
673 int nitems;
674 int i;
675 int ret = 0;
676
677 BUG_ON(!path->nodes[0]);
678
679 leaf = path->nodes[0];
680 free_space = btrfs_leaf_free_space(root, leaf);
681 INIT_LIST_HEAD(&head);
682
683 next = item;
684 nitems = 0;
685
686 /*
687 * count the number of the continuous items that we can insert in batch
688 */
689 while (total_size + next->data_len + sizeof(struct btrfs_item) <=
690 free_space) {
691 total_data_size += next->data_len;
692 total_size += next->data_len + sizeof(struct btrfs_item);
693 list_add_tail(&next->tree_list, &head);
694 nitems++;
695
696 curr = next;
697 next = __btrfs_next_delayed_item(curr);
698 if (!next)
699 break;
700
701 if (!btrfs_is_continuous_delayed_item(curr, next))
702 break;
703 }
704
705 if (!nitems) {
706 ret = 0;
707 goto out;
708 }
709
710 /*
711 * we need allocate some memory space, but it might cause the task
712 * to sleep, so we set all locked nodes in the path to blocking locks
713 * first.
714 */
715 btrfs_set_path_blocking(path);
716
717 keys = kmalloc(sizeof(struct btrfs_key) * nitems, GFP_NOFS);
718 if (!keys) {
719 ret = -ENOMEM;
720 goto out;
721 }
722
723 data_size = kmalloc(sizeof(u32) * nitems, GFP_NOFS);
724 if (!data_size) {
725 ret = -ENOMEM;
726 goto error;
727 }
728
729 /* get keys of all the delayed items */
730 i = 0;
731 list_for_each_entry(next, &head, tree_list) {
732 keys[i] = next->key;
733 data_size[i] = next->data_len;
734 i++;
735 }
736
737 /* reset all the locked nodes in the patch to spinning locks. */
738 btrfs_clear_path_blocking(path, NULL, 0);
739
740 /* insert the keys of the items */
741 ret = setup_items_for_insert(trans, root, path, keys, data_size,
742 total_data_size, total_size, nitems);
743 if (ret)
744 goto error;
745
746 /* insert the dir index items */
747 slot = path->slots[0];
748 list_for_each_entry_safe(curr, next, &head, tree_list) {
749 data_ptr = btrfs_item_ptr(leaf, slot, char);
750 write_extent_buffer(leaf, &curr->data,
751 (unsigned long)data_ptr,
752 curr->data_len);
753 slot++;
754
755 btrfs_delayed_item_release_metadata(root, curr);
756
757 list_del(&curr->tree_list);
758 btrfs_release_delayed_item(curr);
759 }
760
761error:
762 kfree(data_size);
763 kfree(keys);
764out:
765 return ret;
766}
767
768/*
769 * This helper can just do simple insertion that needn't extend item for new
770 * data, such as directory name index insertion, inode insertion.
771 */
772static int btrfs_insert_delayed_item(struct btrfs_trans_handle *trans,
773 struct btrfs_root *root,
774 struct btrfs_path *path,
775 struct btrfs_delayed_item *delayed_item)
776{
777 struct extent_buffer *leaf;
778 struct btrfs_item *item;
779 char *ptr;
780 int ret;
781
782 ret = btrfs_insert_empty_item(trans, root, path, &delayed_item->key,
783 delayed_item->data_len);
784 if (ret < 0 && ret != -EEXIST)
785 return ret;
786
787 leaf = path->nodes[0];
788
789 item = btrfs_item_nr(leaf, path->slots[0]);
790 ptr = btrfs_item_ptr(leaf, path->slots[0], char);
791
792 write_extent_buffer(leaf, delayed_item->data, (unsigned long)ptr,
793 delayed_item->data_len);
794 btrfs_mark_buffer_dirty(leaf);
795
796 btrfs_delayed_item_release_metadata(root, delayed_item);
797 return 0;
798}
799
800/*
801 * we insert an item first, then if there are some continuous items, we try
802 * to insert those items into the same leaf.
803 */
804static int btrfs_insert_delayed_items(struct btrfs_trans_handle *trans,
805 struct btrfs_path *path,
806 struct btrfs_root *root,
807 struct btrfs_delayed_node *node)
808{
809 struct btrfs_delayed_item *curr, *prev;
810 int ret = 0;
811
812do_again:
813 mutex_lock(&node->mutex);
814 curr = __btrfs_first_delayed_insertion_item(node);
815 if (!curr)
816 goto insert_end;
817
818 ret = btrfs_insert_delayed_item(trans, root, path, curr);
819 if (ret < 0) {
820 btrfs_release_path(path);
821 goto insert_end;
822 }
823
824 prev = curr;
825 curr = __btrfs_next_delayed_item(prev);
826 if (curr && btrfs_is_continuous_delayed_item(prev, curr)) {
827 /* insert the continuous items into the same leaf */
828 path->slots[0]++;
829 btrfs_batch_insert_items(trans, root, path, curr);
830 }
831 btrfs_release_delayed_item(prev);
832 btrfs_mark_buffer_dirty(path->nodes[0]);
833
834 btrfs_release_path(path);
835 mutex_unlock(&node->mutex);
836 goto do_again;
837
838insert_end:
839 mutex_unlock(&node->mutex);
840 return ret;
841}
842
843static int btrfs_batch_delete_items(struct btrfs_trans_handle *trans,
844 struct btrfs_root *root,
845 struct btrfs_path *path,
846 struct btrfs_delayed_item *item)
847{
848 struct btrfs_delayed_item *curr, *next;
849 struct extent_buffer *leaf;
850 struct btrfs_key key;
851 struct list_head head;
852 int nitems, i, last_item;
853 int ret = 0;
854
855 BUG_ON(!path->nodes[0]);
856
857 leaf = path->nodes[0];
858
859 i = path->slots[0];
860 last_item = btrfs_header_nritems(leaf) - 1;
861 if (i > last_item)
862 return -ENOENT; /* FIXME: Is errno suitable? */
863
864 next = item;
865 INIT_LIST_HEAD(&head);
866 btrfs_item_key_to_cpu(leaf, &key, i);
867 nitems = 0;
868 /*
869 * count the number of the dir index items that we can delete in batch
870 */
871 while (btrfs_comp_cpu_keys(&next->key, &key) == 0) {
872 list_add_tail(&next->tree_list, &head);
873 nitems++;
874
875 curr = next;
876 next = __btrfs_next_delayed_item(curr);
877 if (!next)
878 break;
879
880 if (!btrfs_is_continuous_delayed_item(curr, next))
881 break;
882
883 i++;
884 if (i > last_item)
885 break;
886 btrfs_item_key_to_cpu(leaf, &key, i);
887 }
888
889 if (!nitems)
890 return 0;
891
892 ret = btrfs_del_items(trans, root, path, path->slots[0], nitems);
893 if (ret)
894 goto out;
895
896 list_for_each_entry_safe(curr, next, &head, tree_list) {
897 btrfs_delayed_item_release_metadata(root, curr);
898 list_del(&curr->tree_list);
899 btrfs_release_delayed_item(curr);
900 }
901
902out:
903 return ret;
904}
905
906static int btrfs_delete_delayed_items(struct btrfs_trans_handle *trans,
907 struct btrfs_path *path,
908 struct btrfs_root *root,
909 struct btrfs_delayed_node *node)
910{
911 struct btrfs_delayed_item *curr, *prev;
912 int ret = 0;
913
914do_again:
915 mutex_lock(&node->mutex);
916 curr = __btrfs_first_delayed_deletion_item(node);
917 if (!curr)
918 goto delete_fail;
919
920 ret = btrfs_search_slot(trans, root, &curr->key, path, -1, 1);
921 if (ret < 0)
922 goto delete_fail;
923 else if (ret > 0) {
924 /*
925 * can't find the item which the node points to, so this node
926 * is invalid, just drop it.
927 */
928 prev = curr;
929 curr = __btrfs_next_delayed_item(prev);
930 btrfs_release_delayed_item(prev);
931 ret = 0;
932 btrfs_release_path(path);
933 if (curr)
934 goto do_again;
935 else
936 goto delete_fail;
937 }
938
939 btrfs_batch_delete_items(trans, root, path, curr);
940 btrfs_release_path(path);
941 mutex_unlock(&node->mutex);
942 goto do_again;
943
944delete_fail:
945 btrfs_release_path(path);
946 mutex_unlock(&node->mutex);
947 return ret;
948}
949
950static void btrfs_release_delayed_inode(struct btrfs_delayed_node *delayed_node)
951{
952 struct btrfs_delayed_root *delayed_root;
953
954 if (delayed_node && delayed_node->inode_dirty) {
955 BUG_ON(!delayed_node->root);
956 delayed_node->inode_dirty = 0;
957 delayed_node->count--;
958
959 delayed_root = delayed_node->root->fs_info->delayed_root;
960 atomic_dec(&delayed_root->items);
961 if (atomic_read(&delayed_root->items) <
962 BTRFS_DELAYED_BACKGROUND &&
963 waitqueue_active(&delayed_root->wait))
964 wake_up(&delayed_root->wait);
965 }
966}
967
968static int btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
969 struct btrfs_root *root,
970 struct btrfs_path *path,
971 struct btrfs_delayed_node *node)
972{
973 struct btrfs_key key;
974 struct btrfs_inode_item *inode_item;
975 struct extent_buffer *leaf;
976 int ret;
977
978 mutex_lock(&node->mutex);
979 if (!node->inode_dirty) {
980 mutex_unlock(&node->mutex);
981 return 0;
982 }
983
984 key.objectid = node->inode_id;
985 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
986 key.offset = 0;
987 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
988 if (ret > 0) {
989 btrfs_release_path(path);
990 mutex_unlock(&node->mutex);
991 return -ENOENT;
992 } else if (ret < 0) {
993 mutex_unlock(&node->mutex);
994 return ret;
995 }
996
997 btrfs_unlock_up_safe(path, 1);
998 leaf = path->nodes[0];
999 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1000 struct btrfs_inode_item);
1001 write_extent_buffer(leaf, &node->inode_item, (unsigned long)inode_item,
1002 sizeof(struct btrfs_inode_item));
1003 btrfs_mark_buffer_dirty(leaf);
1004 btrfs_release_path(path);
1005
1006 btrfs_delayed_inode_release_metadata(root, node);
1007 btrfs_release_delayed_inode(node);
1008 mutex_unlock(&node->mutex);
1009
1010 return 0;
1011}
1012
1013/* Called when committing the transaction. */
1014int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
1015 struct btrfs_root *root)
1016{
1017 struct btrfs_delayed_root *delayed_root;
1018 struct btrfs_delayed_node *curr_node, *prev_node;
1019 struct btrfs_path *path;
1020 struct btrfs_block_rsv *block_rsv;
1021 int ret = 0;
1022
1023 path = btrfs_alloc_path();
1024 if (!path)
1025 return -ENOMEM;
1026 path->leave_spinning = 1;
1027
1028 block_rsv = trans->block_rsv;
1029 trans->block_rsv = &root->fs_info->global_block_rsv;
1030
1031 delayed_root = btrfs_get_delayed_root(root);
1032
1033 curr_node = btrfs_first_delayed_node(delayed_root);
1034 while (curr_node) {
1035 root = curr_node->root;
1036 ret = btrfs_insert_delayed_items(trans, path, root,
1037 curr_node);
1038 if (!ret)
1039 ret = btrfs_delete_delayed_items(trans, path, root,
1040 curr_node);
1041 if (!ret)
1042 ret = btrfs_update_delayed_inode(trans, root, path,
1043 curr_node);
1044 if (ret) {
1045 btrfs_release_delayed_node(curr_node);
1046 break;
1047 }
1048
1049 prev_node = curr_node;
1050 curr_node = btrfs_next_delayed_node(curr_node);
1051 btrfs_release_delayed_node(prev_node);
1052 }
1053
1054 btrfs_free_path(path);
1055 trans->block_rsv = block_rsv;
1056 return ret;
1057}
1058
1059static int __btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
1060 struct btrfs_delayed_node *node)
1061{
1062 struct btrfs_path *path;
1063 struct btrfs_block_rsv *block_rsv;
1064 int ret;
1065
1066 path = btrfs_alloc_path();
1067 if (!path)
1068 return -ENOMEM;
1069 path->leave_spinning = 1;
1070
1071 block_rsv = trans->block_rsv;
1072 trans->block_rsv = &node->root->fs_info->global_block_rsv;
1073
1074 ret = btrfs_insert_delayed_items(trans, path, node->root, node);
1075 if (!ret)
1076 ret = btrfs_delete_delayed_items(trans, path, node->root, node);
1077 if (!ret)
1078 ret = btrfs_update_delayed_inode(trans, node->root, path, node);
1079 btrfs_free_path(path);
1080
1081 trans->block_rsv = block_rsv;
1082 return ret;
1083}
1084
1085int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
1086 struct inode *inode)
1087{
1088 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1089 int ret;
1090
1091 if (!delayed_node)
1092 return 0;
1093
1094 mutex_lock(&delayed_node->mutex);
1095 if (!delayed_node->count) {
1096 mutex_unlock(&delayed_node->mutex);
1097 btrfs_release_delayed_node(delayed_node);
1098 return 0;
1099 }
1100 mutex_unlock(&delayed_node->mutex);
1101
1102 ret = __btrfs_commit_inode_delayed_items(trans, delayed_node);
1103 btrfs_release_delayed_node(delayed_node);
1104 return ret;
1105}
1106
1107void btrfs_remove_delayed_node(struct inode *inode)
1108{
1109 struct btrfs_delayed_node *delayed_node;
1110
1111 delayed_node = ACCESS_ONCE(BTRFS_I(inode)->delayed_node);
1112 if (!delayed_node)
1113 return;
1114
1115 BTRFS_I(inode)->delayed_node = NULL;
1116 btrfs_release_delayed_node(delayed_node);
1117}
1118
1119struct btrfs_async_delayed_node {
1120 struct btrfs_root *root;
1121 struct btrfs_delayed_node *delayed_node;
1122 struct btrfs_work work;
1123};
1124
1125static void btrfs_async_run_delayed_node_done(struct btrfs_work *work)
1126{
1127 struct btrfs_async_delayed_node *async_node;
1128 struct btrfs_trans_handle *trans;
1129 struct btrfs_path *path;
1130 struct btrfs_delayed_node *delayed_node = NULL;
1131 struct btrfs_root *root;
1132 struct btrfs_block_rsv *block_rsv;
1133 unsigned long nr = 0;
1134 int need_requeue = 0;
1135 int ret;
1136
1137 async_node = container_of(work, struct btrfs_async_delayed_node, work);
1138
1139 path = btrfs_alloc_path();
1140 if (!path)
1141 goto out;
1142 path->leave_spinning = 1;
1143
1144 delayed_node = async_node->delayed_node;
1145 root = delayed_node->root;
1146
1147 trans = btrfs_join_transaction(root);
1148 if (IS_ERR(trans))
1149 goto free_path;
1150
1151 block_rsv = trans->block_rsv;
1152 trans->block_rsv = &root->fs_info->global_block_rsv;
1153
1154 ret = btrfs_insert_delayed_items(trans, path, root, delayed_node);
1155 if (!ret)
1156 ret = btrfs_delete_delayed_items(trans, path, root,
1157 delayed_node);
1158
1159 if (!ret)
1160 btrfs_update_delayed_inode(trans, root, path, delayed_node);
1161
1162 /*
1163 * Maybe new delayed items have been inserted, so we need requeue
1164 * the work. Besides that, we must dequeue the empty delayed nodes
1165 * to avoid the race between delayed items balance and the worker.
1166 * The race like this:
1167 * Task1 Worker thread
1168 * count == 0, needn't requeue
1169 * also needn't insert the
1170 * delayed node into prepare
1171 * list again.
1172 * add lots of delayed items
1173 * queue the delayed node
1174 * already in the list,
1175 * and not in the prepare
1176 * list, it means the delayed
1177 * node is being dealt with
1178 * by the worker.
1179 * do delayed items balance
1180 * the delayed node is being
1181 * dealt with by the worker
1182 * now, just wait.
1183 * the worker goto idle.
1184 * Task1 will sleep until the transaction is commited.
1185 */
1186 mutex_lock(&delayed_node->mutex);
1187 if (delayed_node->count)
1188 need_requeue = 1;
1189 else
1190 btrfs_dequeue_delayed_node(root->fs_info->delayed_root,
1191 delayed_node);
1192 mutex_unlock(&delayed_node->mutex);
1193
1194 nr = trans->blocks_used;
1195
1196 trans->block_rsv = block_rsv;
1197 btrfs_end_transaction_dmeta(trans, root);
1198 __btrfs_btree_balance_dirty(root, nr);
1199free_path:
1200 btrfs_free_path(path);
1201out:
1202 if (need_requeue)
1203 btrfs_requeue_work(&async_node->work);
1204 else {
1205 btrfs_release_prepared_delayed_node(delayed_node);
1206 kfree(async_node);
1207 }
1208}
1209
1210static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
1211 struct btrfs_root *root, int all)
1212{
1213 struct btrfs_async_delayed_node *async_node;
1214 struct btrfs_delayed_node *curr;
1215 int count = 0;
1216
1217again:
1218 curr = btrfs_first_prepared_delayed_node(delayed_root);
1219 if (!curr)
1220 return 0;
1221
1222 async_node = kmalloc(sizeof(*async_node), GFP_NOFS);
1223 if (!async_node) {
1224 btrfs_release_prepared_delayed_node(curr);
1225 return -ENOMEM;
1226 }
1227
1228 async_node->root = root;
1229 async_node->delayed_node = curr;
1230
1231 async_node->work.func = btrfs_async_run_delayed_node_done;
1232 async_node->work.flags = 0;
1233
1234 btrfs_queue_worker(&root->fs_info->delayed_workers, &async_node->work);
1235 count++;
1236
1237 if (all || count < 4)
1238 goto again;
1239
1240 return 0;
1241}
1242
1243void btrfs_assert_delayed_root_empty(struct btrfs_root *root)
1244{
1245 struct btrfs_delayed_root *delayed_root;
1246 delayed_root = btrfs_get_delayed_root(root);
1247 WARN_ON(btrfs_first_delayed_node(delayed_root));
1248}
1249
1250void btrfs_balance_delayed_items(struct btrfs_root *root)
1251{
1252 struct btrfs_delayed_root *delayed_root;
1253
1254 delayed_root = btrfs_get_delayed_root(root);
1255
1256 if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
1257 return;
1258
1259 if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
1260 int ret;
1261 ret = btrfs_wq_run_delayed_node(delayed_root, root, 1);
1262 if (ret)
1263 return;
1264
1265 wait_event_interruptible_timeout(
1266 delayed_root->wait,
1267 (atomic_read(&delayed_root->items) <
1268 BTRFS_DELAYED_BACKGROUND),
1269 HZ);
1270 return;
1271 }
1272
1273 btrfs_wq_run_delayed_node(delayed_root, root, 0);
1274}
1275
1276int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
1277 struct btrfs_root *root, const char *name,
1278 int name_len, struct inode *dir,
1279 struct btrfs_disk_key *disk_key, u8 type,
1280 u64 index)
1281{
1282 struct btrfs_delayed_node *delayed_node;
1283 struct btrfs_delayed_item *delayed_item;
1284 struct btrfs_dir_item *dir_item;
1285 int ret;
1286
1287 delayed_node = btrfs_get_or_create_delayed_node(dir);
1288 if (IS_ERR(delayed_node))
1289 return PTR_ERR(delayed_node);
1290
1291 delayed_item = btrfs_alloc_delayed_item(sizeof(*dir_item) + name_len);
1292 if (!delayed_item) {
1293 ret = -ENOMEM;
1294 goto release_node;
1295 }
1296
1297 ret = btrfs_delayed_item_reserve_metadata(trans, root, delayed_item);
1298 /*
1299 * we have reserved enough space when we start a new transaction,
1300 * so reserving metadata failure is impossible
1301 */
1302 BUG_ON(ret);
1303
1304 delayed_item->key.objectid = btrfs_ino(dir);
1305 btrfs_set_key_type(&delayed_item->key, BTRFS_DIR_INDEX_KEY);
1306 delayed_item->key.offset = index;
1307
1308 dir_item = (struct btrfs_dir_item *)delayed_item->data;
1309 dir_item->location = *disk_key;
1310 dir_item->transid = cpu_to_le64(trans->transid);
1311 dir_item->data_len = 0;
1312 dir_item->name_len = cpu_to_le16(name_len);
1313 dir_item->type = type;
1314 memcpy((char *)(dir_item + 1), name, name_len);
1315
1316 mutex_lock(&delayed_node->mutex);
1317 ret = __btrfs_add_delayed_insertion_item(delayed_node, delayed_item);
1318 if (unlikely(ret)) {
1319 printk(KERN_ERR "err add delayed dir index item(name: %s) into "
1320 "the insertion tree of the delayed node"
1321 "(root id: %llu, inode id: %llu, errno: %d)\n",
1322 name,
1323 (unsigned long long)delayed_node->root->objectid,
1324 (unsigned long long)delayed_node->inode_id,
1325 ret);
1326 BUG();
1327 }
1328 mutex_unlock(&delayed_node->mutex);
1329
1330release_node:
1331 btrfs_release_delayed_node(delayed_node);
1332 return ret;
1333}
1334
1335static int btrfs_delete_delayed_insertion_item(struct btrfs_root *root,
1336 struct btrfs_delayed_node *node,
1337 struct btrfs_key *key)
1338{
1339 struct btrfs_delayed_item *item;
1340
1341 mutex_lock(&node->mutex);
1342 item = __btrfs_lookup_delayed_insertion_item(node, key);
1343 if (!item) {
1344 mutex_unlock(&node->mutex);
1345 return 1;
1346 }
1347
1348 btrfs_delayed_item_release_metadata(root, item);
1349 btrfs_release_delayed_item(item);
1350 mutex_unlock(&node->mutex);
1351 return 0;
1352}
1353
1354int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
1355 struct btrfs_root *root, struct inode *dir,
1356 u64 index)
1357{
1358 struct btrfs_delayed_node *node;
1359 struct btrfs_delayed_item *item;
1360 struct btrfs_key item_key;
1361 int ret;
1362
1363 node = btrfs_get_or_create_delayed_node(dir);
1364 if (IS_ERR(node))
1365 return PTR_ERR(node);
1366
1367 item_key.objectid = btrfs_ino(dir);
1368 btrfs_set_key_type(&item_key, BTRFS_DIR_INDEX_KEY);
1369 item_key.offset = index;
1370
1371 ret = btrfs_delete_delayed_insertion_item(root, node, &item_key);
1372 if (!ret)
1373 goto end;
1374
1375 item = btrfs_alloc_delayed_item(0);
1376 if (!item) {
1377 ret = -ENOMEM;
1378 goto end;
1379 }
1380
1381 item->key = item_key;
1382
1383 ret = btrfs_delayed_item_reserve_metadata(trans, root, item);
1384 /*
1385 * we have reserved enough space when we start a new transaction,
1386 * so reserving metadata failure is impossible.
1387 */
1388 BUG_ON(ret);
1389
1390 mutex_lock(&node->mutex);
1391 ret = __btrfs_add_delayed_deletion_item(node, item);
1392 if (unlikely(ret)) {
1393 printk(KERN_ERR "err add delayed dir index item(index: %llu) "
1394 "into the deletion tree of the delayed node"
1395 "(root id: %llu, inode id: %llu, errno: %d)\n",
1396 (unsigned long long)index,
1397 (unsigned long long)node->root->objectid,
1398 (unsigned long long)node->inode_id,
1399 ret);
1400 BUG();
1401 }
1402 mutex_unlock(&node->mutex);
1403end:
1404 btrfs_release_delayed_node(node);
1405 return ret;
1406}
1407
1408int btrfs_inode_delayed_dir_index_count(struct inode *inode)
1409{
1410 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1411
1412 if (!delayed_node)
1413 return -ENOENT;
1414
1415 /*
1416 * Since we have held i_mutex of this directory, it is impossible that
1417 * a new directory index is added into the delayed node and index_cnt
1418 * is updated now. So we needn't lock the delayed node.
1419 */
1420 if (!delayed_node->index_cnt) {
1421 btrfs_release_delayed_node(delayed_node);
1422 return -EINVAL;
1423 }
1424
1425 BTRFS_I(inode)->index_cnt = delayed_node->index_cnt;
1426 btrfs_release_delayed_node(delayed_node);
1427 return 0;
1428}
1429
1430void btrfs_get_delayed_items(struct inode *inode, struct list_head *ins_list,
1431 struct list_head *del_list)
1432{
1433 struct btrfs_delayed_node *delayed_node;
1434 struct btrfs_delayed_item *item;
1435
1436 delayed_node = btrfs_get_delayed_node(inode);
1437 if (!delayed_node)
1438 return;
1439
1440 mutex_lock(&delayed_node->mutex);
1441 item = __btrfs_first_delayed_insertion_item(delayed_node);
1442 while (item) {
1443 atomic_inc(&item->refs);
1444 list_add_tail(&item->readdir_list, ins_list);
1445 item = __btrfs_next_delayed_item(item);
1446 }
1447
1448 item = __btrfs_first_delayed_deletion_item(delayed_node);
1449 while (item) {
1450 atomic_inc(&item->refs);
1451 list_add_tail(&item->readdir_list, del_list);
1452 item = __btrfs_next_delayed_item(item);
1453 }
1454 mutex_unlock(&delayed_node->mutex);
1455 /*
1456 * This delayed node is still cached in the btrfs inode, so refs
1457 * must be > 1 now, and we needn't check it is going to be freed
1458 * or not.
1459 *
1460 * Besides that, this function is used to read dir, we do not
1461 * insert/delete delayed items in this period. So we also needn't
1462 * requeue or dequeue this delayed node.
1463 */
1464 atomic_dec(&delayed_node->refs);
1465}
1466
1467void btrfs_put_delayed_items(struct list_head *ins_list,
1468 struct list_head *del_list)
1469{
1470 struct btrfs_delayed_item *curr, *next;
1471
1472 list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
1473 list_del(&curr->readdir_list);
1474 if (atomic_dec_and_test(&curr->refs))
1475 kfree(curr);
1476 }
1477
1478 list_for_each_entry_safe(curr, next, del_list, readdir_list) {
1479 list_del(&curr->readdir_list);
1480 if (atomic_dec_and_test(&curr->refs))
1481 kfree(curr);
1482 }
1483}
1484
1485int btrfs_should_delete_dir_index(struct list_head *del_list,
1486 u64 index)
1487{
1488 struct btrfs_delayed_item *curr, *next;
1489 int ret;
1490
1491 if (list_empty(del_list))
1492 return 0;
1493
1494 list_for_each_entry_safe(curr, next, del_list, readdir_list) {
1495 if (curr->key.offset > index)
1496 break;
1497
1498 list_del(&curr->readdir_list);
1499 ret = (curr->key.offset == index);
1500
1501 if (atomic_dec_and_test(&curr->refs))
1502 kfree(curr);
1503
1504 if (ret)
1505 return 1;
1506 else
1507 continue;
1508 }
1509 return 0;
1510}
1511
1512/*
1513 * btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree
1514 *
1515 */
1516int btrfs_readdir_delayed_dir_index(struct file *filp, void *dirent,
1517 filldir_t filldir,
1518 struct list_head *ins_list)
1519{
1520 struct btrfs_dir_item *di;
1521 struct btrfs_delayed_item *curr, *next;
1522 struct btrfs_key location;
1523 char *name;
1524 int name_len;
1525 int over = 0;
1526 unsigned char d_type;
1527
1528 if (list_empty(ins_list))
1529 return 0;
1530
1531 /*
1532 * Changing the data of the delayed item is impossible. So
1533 * we needn't lock them. And we have held i_mutex of the
1534 * directory, nobody can delete any directory indexes now.
1535 */
1536 list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
1537 list_del(&curr->readdir_list);
1538
1539 if (curr->key.offset < filp->f_pos) {
1540 if (atomic_dec_and_test(&curr->refs))
1541 kfree(curr);
1542 continue;
1543 }
1544
1545 filp->f_pos = curr->key.offset;
1546
1547 di = (struct btrfs_dir_item *)curr->data;
1548 name = (char *)(di + 1);
1549 name_len = le16_to_cpu(di->name_len);
1550
1551 d_type = btrfs_filetype_table[di->type];
1552 btrfs_disk_key_to_cpu(&location, &di->location);
1553
1554 over = filldir(dirent, name, name_len, curr->key.offset,
1555 location.objectid, d_type);
1556
1557 if (atomic_dec_and_test(&curr->refs))
1558 kfree(curr);
1559
1560 if (over)
1561 return 1;
1562 }
1563 return 0;
1564}
1565
1566BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1567 generation, 64);
1568BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1569 sequence, 64);
1570BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1571 transid, 64);
1572BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1573BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1574 nbytes, 64);
1575BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1576 block_group, 64);
1577BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1578BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1579BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1580BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1581BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1582BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1583
1584BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1585BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1586
1587static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
1588 struct btrfs_inode_item *inode_item,
1589 struct inode *inode)
1590{
1591 btrfs_set_stack_inode_uid(inode_item, inode->i_uid);
1592 btrfs_set_stack_inode_gid(inode_item, inode->i_gid);
1593 btrfs_set_stack_inode_size(inode_item, BTRFS_I(inode)->disk_i_size);
1594 btrfs_set_stack_inode_mode(inode_item, inode->i_mode);
1595 btrfs_set_stack_inode_nlink(inode_item, inode->i_nlink);
1596 btrfs_set_stack_inode_nbytes(inode_item, inode_get_bytes(inode));
1597 btrfs_set_stack_inode_generation(inode_item,
1598 BTRFS_I(inode)->generation);
1599 btrfs_set_stack_inode_sequence(inode_item, BTRFS_I(inode)->sequence);
1600 btrfs_set_stack_inode_transid(inode_item, trans->transid);
1601 btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
1602 btrfs_set_stack_inode_flags(inode_item, BTRFS_I(inode)->flags);
1603 btrfs_set_stack_inode_block_group(inode_item, 0);
1604
1605 btrfs_set_stack_timespec_sec(btrfs_inode_atime(inode_item),
1606 inode->i_atime.tv_sec);
1607 btrfs_set_stack_timespec_nsec(btrfs_inode_atime(inode_item),
1608 inode->i_atime.tv_nsec);
1609
1610 btrfs_set_stack_timespec_sec(btrfs_inode_mtime(inode_item),
1611 inode->i_mtime.tv_sec);
1612 btrfs_set_stack_timespec_nsec(btrfs_inode_mtime(inode_item),
1613 inode->i_mtime.tv_nsec);
1614
1615 btrfs_set_stack_timespec_sec(btrfs_inode_ctime(inode_item),
1616 inode->i_ctime.tv_sec);
1617 btrfs_set_stack_timespec_nsec(btrfs_inode_ctime(inode_item),
1618 inode->i_ctime.tv_nsec);
1619}
1620
1621int btrfs_fill_inode(struct inode *inode, u32 *rdev)
1622{
1623 struct btrfs_delayed_node *delayed_node;
1624 struct btrfs_inode_item *inode_item;
1625 struct btrfs_timespec *tspec;
1626
1627 delayed_node = btrfs_get_delayed_node(inode);
1628 if (!delayed_node)
1629 return -ENOENT;
1630
1631 mutex_lock(&delayed_node->mutex);
1632 if (!delayed_node->inode_dirty) {
1633 mutex_unlock(&delayed_node->mutex);
1634 btrfs_release_delayed_node(delayed_node);
1635 return -ENOENT;
1636 }
1637
1638 inode_item = &delayed_node->inode_item;
1639
1640 inode->i_uid = btrfs_stack_inode_uid(inode_item);
1641 inode->i_gid = btrfs_stack_inode_gid(inode_item);
1642 btrfs_i_size_write(inode, btrfs_stack_inode_size(inode_item));
1643 inode->i_mode = btrfs_stack_inode_mode(inode_item);
1644 inode->i_nlink = btrfs_stack_inode_nlink(inode_item);
1645 inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
1646 BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
1647 BTRFS_I(inode)->sequence = btrfs_stack_inode_sequence(inode_item);
1648 inode->i_rdev = 0;
1649 *rdev = btrfs_stack_inode_rdev(inode_item);
1650 BTRFS_I(inode)->flags = btrfs_stack_inode_flags(inode_item);
1651
1652 tspec = btrfs_inode_atime(inode_item);
1653 inode->i_atime.tv_sec = btrfs_stack_timespec_sec(tspec);
1654 inode->i_atime.tv_nsec = btrfs_stack_timespec_nsec(tspec);
1655
1656 tspec = btrfs_inode_mtime(inode_item);
1657 inode->i_mtime.tv_sec = btrfs_stack_timespec_sec(tspec);
1658 inode->i_mtime.tv_nsec = btrfs_stack_timespec_nsec(tspec);
1659
1660 tspec = btrfs_inode_ctime(inode_item);
1661 inode->i_ctime.tv_sec = btrfs_stack_timespec_sec(tspec);
1662 inode->i_ctime.tv_nsec = btrfs_stack_timespec_nsec(tspec);
1663
1664 inode->i_generation = BTRFS_I(inode)->generation;
1665 BTRFS_I(inode)->index_cnt = (u64)-1;
1666
1667 mutex_unlock(&delayed_node->mutex);
1668 btrfs_release_delayed_node(delayed_node);
1669 return 0;
1670}
1671
1672int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
1673 struct btrfs_root *root, struct inode *inode)
1674{
1675 struct btrfs_delayed_node *delayed_node;
1676 int ret = 0;
1677
1678 delayed_node = btrfs_get_or_create_delayed_node(inode);
1679 if (IS_ERR(delayed_node))
1680 return PTR_ERR(delayed_node);
1681
1682 mutex_lock(&delayed_node->mutex);
1683 if (delayed_node->inode_dirty) {
1684 fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
1685 goto release_node;
1686 }
1687
1688 ret = btrfs_delayed_inode_reserve_metadata(trans, root, delayed_node);
1689 /*
1690 * we must reserve enough space when we start a new transaction,
1691 * so reserving metadata failure is impossible
1692 */
1693 BUG_ON(ret);
1694
1695 fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
1696 delayed_node->inode_dirty = 1;
1697 delayed_node->count++;
1698 atomic_inc(&root->fs_info->delayed_root->items);
1699release_node:
1700 mutex_unlock(&delayed_node->mutex);
1701 btrfs_release_delayed_node(delayed_node);
1702 return ret;
1703}
1704
1705static void __btrfs_kill_delayed_node(struct btrfs_delayed_node *delayed_node)
1706{
1707 struct btrfs_root *root = delayed_node->root;
1708 struct btrfs_delayed_item *curr_item, *prev_item;
1709
1710 mutex_lock(&delayed_node->mutex);
1711 curr_item = __btrfs_first_delayed_insertion_item(delayed_node);
1712 while (curr_item) {
1713 btrfs_delayed_item_release_metadata(root, curr_item);
1714 prev_item = curr_item;
1715 curr_item = __btrfs_next_delayed_item(prev_item);
1716 btrfs_release_delayed_item(prev_item);
1717 }
1718
1719 curr_item = __btrfs_first_delayed_deletion_item(delayed_node);
1720 while (curr_item) {
1721 btrfs_delayed_item_release_metadata(root, curr_item);
1722 prev_item = curr_item;
1723 curr_item = __btrfs_next_delayed_item(prev_item);
1724 btrfs_release_delayed_item(prev_item);
1725 }
1726
1727 if (delayed_node->inode_dirty) {
1728 btrfs_delayed_inode_release_metadata(root, delayed_node);
1729 btrfs_release_delayed_inode(delayed_node);
1730 }
1731 mutex_unlock(&delayed_node->mutex);
1732}
1733
1734void btrfs_kill_delayed_inode_items(struct inode *inode)
1735{
1736 struct btrfs_delayed_node *delayed_node;
1737
1738 delayed_node = btrfs_get_delayed_node(inode);
1739 if (!delayed_node)
1740 return;
1741
1742 __btrfs_kill_delayed_node(delayed_node);
1743 btrfs_release_delayed_node(delayed_node);
1744}
1745
1746void btrfs_kill_all_delayed_nodes(struct btrfs_root *root)
1747{
1748 u64 inode_id = 0;
1749 struct btrfs_delayed_node *delayed_nodes[8];
1750 int i, n;
1751
1752 while (1) {
1753 spin_lock(&root->inode_lock);
1754 n = radix_tree_gang_lookup(&root->delayed_nodes_tree,
1755 (void **)delayed_nodes, inode_id,
1756 ARRAY_SIZE(delayed_nodes));
1757 if (!n) {
1758 spin_unlock(&root->inode_lock);
1759 break;
1760 }
1761
1762 inode_id = delayed_nodes[n - 1]->inode_id + 1;
1763
1764 for (i = 0; i < n; i++)
1765 atomic_inc(&delayed_nodes[i]->refs);
1766 spin_unlock(&root->inode_lock);
1767
1768 for (i = 0; i < n; i++) {
1769 __btrfs_kill_delayed_node(delayed_nodes[i]);
1770 btrfs_release_delayed_node(delayed_nodes[i]);
1771 }
1772 }
1773}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2011 Fujitsu. All rights reserved.
4 * Written by Miao Xie <miaox@cn.fujitsu.com>
5 */
6
7#include <linux/slab.h>
8#include <linux/iversion.h>
9#include "ctree.h"
10#include "fs.h"
11#include "messages.h"
12#include "misc.h"
13#include "delayed-inode.h"
14#include "disk-io.h"
15#include "transaction.h"
16#include "qgroup.h"
17#include "locking.h"
18#include "inode-item.h"
19#include "space-info.h"
20#include "accessors.h"
21#include "file-item.h"
22
23#define BTRFS_DELAYED_WRITEBACK 512
24#define BTRFS_DELAYED_BACKGROUND 128
25#define BTRFS_DELAYED_BATCH 16
26
27static struct kmem_cache *delayed_node_cache;
28
29int __init btrfs_delayed_inode_init(void)
30{
31 delayed_node_cache = KMEM_CACHE(btrfs_delayed_node, 0);
32 if (!delayed_node_cache)
33 return -ENOMEM;
34 return 0;
35}
36
37void __cold btrfs_delayed_inode_exit(void)
38{
39 kmem_cache_destroy(delayed_node_cache);
40}
41
42void btrfs_init_delayed_root(struct btrfs_delayed_root *delayed_root)
43{
44 atomic_set(&delayed_root->items, 0);
45 atomic_set(&delayed_root->items_seq, 0);
46 delayed_root->nodes = 0;
47 spin_lock_init(&delayed_root->lock);
48 init_waitqueue_head(&delayed_root->wait);
49 INIT_LIST_HEAD(&delayed_root->node_list);
50 INIT_LIST_HEAD(&delayed_root->prepare_list);
51}
52
53static inline void btrfs_init_delayed_node(
54 struct btrfs_delayed_node *delayed_node,
55 struct btrfs_root *root, u64 inode_id)
56{
57 delayed_node->root = root;
58 delayed_node->inode_id = inode_id;
59 refcount_set(&delayed_node->refs, 0);
60 delayed_node->ins_root = RB_ROOT_CACHED;
61 delayed_node->del_root = RB_ROOT_CACHED;
62 mutex_init(&delayed_node->mutex);
63 INIT_LIST_HEAD(&delayed_node->n_list);
64 INIT_LIST_HEAD(&delayed_node->p_list);
65}
66
67static struct btrfs_delayed_node *btrfs_get_delayed_node(
68 struct btrfs_inode *btrfs_inode)
69{
70 struct btrfs_root *root = btrfs_inode->root;
71 u64 ino = btrfs_ino(btrfs_inode);
72 struct btrfs_delayed_node *node;
73
74 node = READ_ONCE(btrfs_inode->delayed_node);
75 if (node) {
76 refcount_inc(&node->refs);
77 return node;
78 }
79
80 spin_lock(&root->inode_lock);
81 node = xa_load(&root->delayed_nodes, ino);
82
83 if (node) {
84 if (btrfs_inode->delayed_node) {
85 refcount_inc(&node->refs); /* can be accessed */
86 BUG_ON(btrfs_inode->delayed_node != node);
87 spin_unlock(&root->inode_lock);
88 return node;
89 }
90
91 /*
92 * It's possible that we're racing into the middle of removing
93 * this node from the xarray. In this case, the refcount
94 * was zero and it should never go back to one. Just return
95 * NULL like it was never in the xarray at all; our release
96 * function is in the process of removing it.
97 *
98 * Some implementations of refcount_inc refuse to bump the
99 * refcount once it has hit zero. If we don't do this dance
100 * here, refcount_inc() may decide to just WARN_ONCE() instead
101 * of actually bumping the refcount.
102 *
103 * If this node is properly in the xarray, we want to bump the
104 * refcount twice, once for the inode and once for this get
105 * operation.
106 */
107 if (refcount_inc_not_zero(&node->refs)) {
108 refcount_inc(&node->refs);
109 btrfs_inode->delayed_node = node;
110 } else {
111 node = NULL;
112 }
113
114 spin_unlock(&root->inode_lock);
115 return node;
116 }
117 spin_unlock(&root->inode_lock);
118
119 return NULL;
120}
121
122/* Will return either the node or PTR_ERR(-ENOMEM) */
123static struct btrfs_delayed_node *btrfs_get_or_create_delayed_node(
124 struct btrfs_inode *btrfs_inode)
125{
126 struct btrfs_delayed_node *node;
127 struct btrfs_root *root = btrfs_inode->root;
128 u64 ino = btrfs_ino(btrfs_inode);
129 int ret;
130 void *ptr;
131
132again:
133 node = btrfs_get_delayed_node(btrfs_inode);
134 if (node)
135 return node;
136
137 node = kmem_cache_zalloc(delayed_node_cache, GFP_NOFS);
138 if (!node)
139 return ERR_PTR(-ENOMEM);
140 btrfs_init_delayed_node(node, root, ino);
141
142 /* Cached in the inode and can be accessed. */
143 refcount_set(&node->refs, 2);
144
145 /* Allocate and reserve the slot, from now it can return a NULL from xa_load(). */
146 ret = xa_reserve(&root->delayed_nodes, ino, GFP_NOFS);
147 if (ret == -ENOMEM) {
148 kmem_cache_free(delayed_node_cache, node);
149 return ERR_PTR(-ENOMEM);
150 }
151 spin_lock(&root->inode_lock);
152 ptr = xa_load(&root->delayed_nodes, ino);
153 if (ptr) {
154 /* Somebody inserted it, go back and read it. */
155 spin_unlock(&root->inode_lock);
156 kmem_cache_free(delayed_node_cache, node);
157 node = NULL;
158 goto again;
159 }
160 ptr = xa_store(&root->delayed_nodes, ino, node, GFP_ATOMIC);
161 ASSERT(xa_err(ptr) != -EINVAL);
162 ASSERT(xa_err(ptr) != -ENOMEM);
163 ASSERT(ptr == NULL);
164 btrfs_inode->delayed_node = node;
165 spin_unlock(&root->inode_lock);
166
167 return node;
168}
169
170/*
171 * Call it when holding delayed_node->mutex
172 *
173 * If mod = 1, add this node into the prepared list.
174 */
175static void btrfs_queue_delayed_node(struct btrfs_delayed_root *root,
176 struct btrfs_delayed_node *node,
177 int mod)
178{
179 spin_lock(&root->lock);
180 if (test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
181 if (!list_empty(&node->p_list))
182 list_move_tail(&node->p_list, &root->prepare_list);
183 else if (mod)
184 list_add_tail(&node->p_list, &root->prepare_list);
185 } else {
186 list_add_tail(&node->n_list, &root->node_list);
187 list_add_tail(&node->p_list, &root->prepare_list);
188 refcount_inc(&node->refs); /* inserted into list */
189 root->nodes++;
190 set_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags);
191 }
192 spin_unlock(&root->lock);
193}
194
195/* Call it when holding delayed_node->mutex */
196static void btrfs_dequeue_delayed_node(struct btrfs_delayed_root *root,
197 struct btrfs_delayed_node *node)
198{
199 spin_lock(&root->lock);
200 if (test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
201 root->nodes--;
202 refcount_dec(&node->refs); /* not in the list */
203 list_del_init(&node->n_list);
204 if (!list_empty(&node->p_list))
205 list_del_init(&node->p_list);
206 clear_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags);
207 }
208 spin_unlock(&root->lock);
209}
210
211static struct btrfs_delayed_node *btrfs_first_delayed_node(
212 struct btrfs_delayed_root *delayed_root)
213{
214 struct list_head *p;
215 struct btrfs_delayed_node *node = NULL;
216
217 spin_lock(&delayed_root->lock);
218 if (list_empty(&delayed_root->node_list))
219 goto out;
220
221 p = delayed_root->node_list.next;
222 node = list_entry(p, struct btrfs_delayed_node, n_list);
223 refcount_inc(&node->refs);
224out:
225 spin_unlock(&delayed_root->lock);
226
227 return node;
228}
229
230static struct btrfs_delayed_node *btrfs_next_delayed_node(
231 struct btrfs_delayed_node *node)
232{
233 struct btrfs_delayed_root *delayed_root;
234 struct list_head *p;
235 struct btrfs_delayed_node *next = NULL;
236
237 delayed_root = node->root->fs_info->delayed_root;
238 spin_lock(&delayed_root->lock);
239 if (!test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
240 /* not in the list */
241 if (list_empty(&delayed_root->node_list))
242 goto out;
243 p = delayed_root->node_list.next;
244 } else if (list_is_last(&node->n_list, &delayed_root->node_list))
245 goto out;
246 else
247 p = node->n_list.next;
248
249 next = list_entry(p, struct btrfs_delayed_node, n_list);
250 refcount_inc(&next->refs);
251out:
252 spin_unlock(&delayed_root->lock);
253
254 return next;
255}
256
257static void __btrfs_release_delayed_node(
258 struct btrfs_delayed_node *delayed_node,
259 int mod)
260{
261 struct btrfs_delayed_root *delayed_root;
262
263 if (!delayed_node)
264 return;
265
266 delayed_root = delayed_node->root->fs_info->delayed_root;
267
268 mutex_lock(&delayed_node->mutex);
269 if (delayed_node->count)
270 btrfs_queue_delayed_node(delayed_root, delayed_node, mod);
271 else
272 btrfs_dequeue_delayed_node(delayed_root, delayed_node);
273 mutex_unlock(&delayed_node->mutex);
274
275 if (refcount_dec_and_test(&delayed_node->refs)) {
276 struct btrfs_root *root = delayed_node->root;
277
278 spin_lock(&root->inode_lock);
279 /*
280 * Once our refcount goes to zero, nobody is allowed to bump it
281 * back up. We can delete it now.
282 */
283 ASSERT(refcount_read(&delayed_node->refs) == 0);
284 xa_erase(&root->delayed_nodes, delayed_node->inode_id);
285 spin_unlock(&root->inode_lock);
286 kmem_cache_free(delayed_node_cache, delayed_node);
287 }
288}
289
290static inline void btrfs_release_delayed_node(struct btrfs_delayed_node *node)
291{
292 __btrfs_release_delayed_node(node, 0);
293}
294
295static struct btrfs_delayed_node *btrfs_first_prepared_delayed_node(
296 struct btrfs_delayed_root *delayed_root)
297{
298 struct list_head *p;
299 struct btrfs_delayed_node *node = NULL;
300
301 spin_lock(&delayed_root->lock);
302 if (list_empty(&delayed_root->prepare_list))
303 goto out;
304
305 p = delayed_root->prepare_list.next;
306 list_del_init(p);
307 node = list_entry(p, struct btrfs_delayed_node, p_list);
308 refcount_inc(&node->refs);
309out:
310 spin_unlock(&delayed_root->lock);
311
312 return node;
313}
314
315static inline void btrfs_release_prepared_delayed_node(
316 struct btrfs_delayed_node *node)
317{
318 __btrfs_release_delayed_node(node, 1);
319}
320
321static struct btrfs_delayed_item *btrfs_alloc_delayed_item(u16 data_len,
322 struct btrfs_delayed_node *node,
323 enum btrfs_delayed_item_type type)
324{
325 struct btrfs_delayed_item *item;
326
327 item = kmalloc(struct_size(item, data, data_len), GFP_NOFS);
328 if (item) {
329 item->data_len = data_len;
330 item->type = type;
331 item->bytes_reserved = 0;
332 item->delayed_node = node;
333 RB_CLEAR_NODE(&item->rb_node);
334 INIT_LIST_HEAD(&item->log_list);
335 item->logged = false;
336 refcount_set(&item->refs, 1);
337 }
338 return item;
339}
340
341/*
342 * Look up the delayed item by key.
343 *
344 * @delayed_node: pointer to the delayed node
345 * @index: the dir index value to lookup (offset of a dir index key)
346 *
347 * Note: if we don't find the right item, we will return the prev item and
348 * the next item.
349 */
350static struct btrfs_delayed_item *__btrfs_lookup_delayed_item(
351 struct rb_root *root,
352 u64 index)
353{
354 struct rb_node *node = root->rb_node;
355 struct btrfs_delayed_item *delayed_item = NULL;
356
357 while (node) {
358 delayed_item = rb_entry(node, struct btrfs_delayed_item,
359 rb_node);
360 if (delayed_item->index < index)
361 node = node->rb_right;
362 else if (delayed_item->index > index)
363 node = node->rb_left;
364 else
365 return delayed_item;
366 }
367
368 return NULL;
369}
370
371static int __btrfs_add_delayed_item(struct btrfs_delayed_node *delayed_node,
372 struct btrfs_delayed_item *ins)
373{
374 struct rb_node **p, *node;
375 struct rb_node *parent_node = NULL;
376 struct rb_root_cached *root;
377 struct btrfs_delayed_item *item;
378 bool leftmost = true;
379
380 if (ins->type == BTRFS_DELAYED_INSERTION_ITEM)
381 root = &delayed_node->ins_root;
382 else
383 root = &delayed_node->del_root;
384
385 p = &root->rb_root.rb_node;
386 node = &ins->rb_node;
387
388 while (*p) {
389 parent_node = *p;
390 item = rb_entry(parent_node, struct btrfs_delayed_item,
391 rb_node);
392
393 if (item->index < ins->index) {
394 p = &(*p)->rb_right;
395 leftmost = false;
396 } else if (item->index > ins->index) {
397 p = &(*p)->rb_left;
398 } else {
399 return -EEXIST;
400 }
401 }
402
403 rb_link_node(node, parent_node, p);
404 rb_insert_color_cached(node, root, leftmost);
405
406 if (ins->type == BTRFS_DELAYED_INSERTION_ITEM &&
407 ins->index >= delayed_node->index_cnt)
408 delayed_node->index_cnt = ins->index + 1;
409
410 delayed_node->count++;
411 atomic_inc(&delayed_node->root->fs_info->delayed_root->items);
412 return 0;
413}
414
415static void finish_one_item(struct btrfs_delayed_root *delayed_root)
416{
417 int seq = atomic_inc_return(&delayed_root->items_seq);
418
419 /* atomic_dec_return implies a barrier */
420 if ((atomic_dec_return(&delayed_root->items) <
421 BTRFS_DELAYED_BACKGROUND || seq % BTRFS_DELAYED_BATCH == 0))
422 cond_wake_up_nomb(&delayed_root->wait);
423}
424
425static void __btrfs_remove_delayed_item(struct btrfs_delayed_item *delayed_item)
426{
427 struct btrfs_delayed_node *delayed_node = delayed_item->delayed_node;
428 struct rb_root_cached *root;
429 struct btrfs_delayed_root *delayed_root;
430
431 /* Not inserted, ignore it. */
432 if (RB_EMPTY_NODE(&delayed_item->rb_node))
433 return;
434
435 /* If it's in a rbtree, then we need to have delayed node locked. */
436 lockdep_assert_held(&delayed_node->mutex);
437
438 delayed_root = delayed_node->root->fs_info->delayed_root;
439
440 if (delayed_item->type == BTRFS_DELAYED_INSERTION_ITEM)
441 root = &delayed_node->ins_root;
442 else
443 root = &delayed_node->del_root;
444
445 rb_erase_cached(&delayed_item->rb_node, root);
446 RB_CLEAR_NODE(&delayed_item->rb_node);
447 delayed_node->count--;
448
449 finish_one_item(delayed_root);
450}
451
452static void btrfs_release_delayed_item(struct btrfs_delayed_item *item)
453{
454 if (item) {
455 __btrfs_remove_delayed_item(item);
456 if (refcount_dec_and_test(&item->refs))
457 kfree(item);
458 }
459}
460
461static struct btrfs_delayed_item *__btrfs_first_delayed_insertion_item(
462 struct btrfs_delayed_node *delayed_node)
463{
464 struct rb_node *p;
465 struct btrfs_delayed_item *item = NULL;
466
467 p = rb_first_cached(&delayed_node->ins_root);
468 if (p)
469 item = rb_entry(p, struct btrfs_delayed_item, rb_node);
470
471 return item;
472}
473
474static struct btrfs_delayed_item *__btrfs_first_delayed_deletion_item(
475 struct btrfs_delayed_node *delayed_node)
476{
477 struct rb_node *p;
478 struct btrfs_delayed_item *item = NULL;
479
480 p = rb_first_cached(&delayed_node->del_root);
481 if (p)
482 item = rb_entry(p, struct btrfs_delayed_item, rb_node);
483
484 return item;
485}
486
487static struct btrfs_delayed_item *__btrfs_next_delayed_item(
488 struct btrfs_delayed_item *item)
489{
490 struct rb_node *p;
491 struct btrfs_delayed_item *next = NULL;
492
493 p = rb_next(&item->rb_node);
494 if (p)
495 next = rb_entry(p, struct btrfs_delayed_item, rb_node);
496
497 return next;
498}
499
500static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans,
501 struct btrfs_delayed_item *item)
502{
503 struct btrfs_block_rsv *src_rsv;
504 struct btrfs_block_rsv *dst_rsv;
505 struct btrfs_fs_info *fs_info = trans->fs_info;
506 u64 num_bytes;
507 int ret;
508
509 if (!trans->bytes_reserved)
510 return 0;
511
512 src_rsv = trans->block_rsv;
513 dst_rsv = &fs_info->delayed_block_rsv;
514
515 num_bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
516
517 /*
518 * Here we migrate space rsv from transaction rsv, since have already
519 * reserved space when starting a transaction. So no need to reserve
520 * qgroup space here.
521 */
522 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, true);
523 if (!ret) {
524 trace_btrfs_space_reservation(fs_info, "delayed_item",
525 item->delayed_node->inode_id,
526 num_bytes, 1);
527 /*
528 * For insertions we track reserved metadata space by accounting
529 * for the number of leaves that will be used, based on the delayed
530 * node's curr_index_batch_size and index_item_leaves fields.
531 */
532 if (item->type == BTRFS_DELAYED_DELETION_ITEM)
533 item->bytes_reserved = num_bytes;
534 }
535
536 return ret;
537}
538
539static void btrfs_delayed_item_release_metadata(struct btrfs_root *root,
540 struct btrfs_delayed_item *item)
541{
542 struct btrfs_block_rsv *rsv;
543 struct btrfs_fs_info *fs_info = root->fs_info;
544
545 if (!item->bytes_reserved)
546 return;
547
548 rsv = &fs_info->delayed_block_rsv;
549 /*
550 * Check btrfs_delayed_item_reserve_metadata() to see why we don't need
551 * to release/reserve qgroup space.
552 */
553 trace_btrfs_space_reservation(fs_info, "delayed_item",
554 item->delayed_node->inode_id,
555 item->bytes_reserved, 0);
556 btrfs_block_rsv_release(fs_info, rsv, item->bytes_reserved, NULL);
557}
558
559static void btrfs_delayed_item_release_leaves(struct btrfs_delayed_node *node,
560 unsigned int num_leaves)
561{
562 struct btrfs_fs_info *fs_info = node->root->fs_info;
563 const u64 bytes = btrfs_calc_insert_metadata_size(fs_info, num_leaves);
564
565 /* There are no space reservations during log replay, bail out. */
566 if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
567 return;
568
569 trace_btrfs_space_reservation(fs_info, "delayed_item", node->inode_id,
570 bytes, 0);
571 btrfs_block_rsv_release(fs_info, &fs_info->delayed_block_rsv, bytes, NULL);
572}
573
574static int btrfs_delayed_inode_reserve_metadata(
575 struct btrfs_trans_handle *trans,
576 struct btrfs_root *root,
577 struct btrfs_delayed_node *node)
578{
579 struct btrfs_fs_info *fs_info = root->fs_info;
580 struct btrfs_block_rsv *src_rsv;
581 struct btrfs_block_rsv *dst_rsv;
582 u64 num_bytes;
583 int ret;
584
585 src_rsv = trans->block_rsv;
586 dst_rsv = &fs_info->delayed_block_rsv;
587
588 num_bytes = btrfs_calc_metadata_size(fs_info, 1);
589
590 /*
591 * btrfs_dirty_inode will update the inode under btrfs_join_transaction
592 * which doesn't reserve space for speed. This is a problem since we
593 * still need to reserve space for this update, so try to reserve the
594 * space.
595 *
596 * Now if src_rsv == delalloc_block_rsv we'll let it just steal since
597 * we always reserve enough to update the inode item.
598 */
599 if (!src_rsv || (!trans->bytes_reserved &&
600 src_rsv->type != BTRFS_BLOCK_RSV_DELALLOC)) {
601 ret = btrfs_qgroup_reserve_meta(root, num_bytes,
602 BTRFS_QGROUP_RSV_META_PREALLOC, true);
603 if (ret < 0)
604 return ret;
605 ret = btrfs_block_rsv_add(fs_info, dst_rsv, num_bytes,
606 BTRFS_RESERVE_NO_FLUSH);
607 /* NO_FLUSH could only fail with -ENOSPC */
608 ASSERT(ret == 0 || ret == -ENOSPC);
609 if (ret)
610 btrfs_qgroup_free_meta_prealloc(root, num_bytes);
611 } else {
612 ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, true);
613 }
614
615 if (!ret) {
616 trace_btrfs_space_reservation(fs_info, "delayed_inode",
617 node->inode_id, num_bytes, 1);
618 node->bytes_reserved = num_bytes;
619 }
620
621 return ret;
622}
623
624static void btrfs_delayed_inode_release_metadata(struct btrfs_fs_info *fs_info,
625 struct btrfs_delayed_node *node,
626 bool qgroup_free)
627{
628 struct btrfs_block_rsv *rsv;
629
630 if (!node->bytes_reserved)
631 return;
632
633 rsv = &fs_info->delayed_block_rsv;
634 trace_btrfs_space_reservation(fs_info, "delayed_inode",
635 node->inode_id, node->bytes_reserved, 0);
636 btrfs_block_rsv_release(fs_info, rsv, node->bytes_reserved, NULL);
637 if (qgroup_free)
638 btrfs_qgroup_free_meta_prealloc(node->root,
639 node->bytes_reserved);
640 else
641 btrfs_qgroup_convert_reserved_meta(node->root,
642 node->bytes_reserved);
643 node->bytes_reserved = 0;
644}
645
646/*
647 * Insert a single delayed item or a batch of delayed items, as many as possible
648 * that fit in a leaf. The delayed items (dir index keys) are sorted by their key
649 * in the rbtree, and if there's a gap between two consecutive dir index items,
650 * then it means at some point we had delayed dir indexes to add but they got
651 * removed (by btrfs_delete_delayed_dir_index()) before we attempted to flush them
652 * into the subvolume tree. Dir index keys also have their offsets coming from a
653 * monotonically increasing counter, so we can't get new keys with an offset that
654 * fits within a gap between delayed dir index items.
655 */
656static int btrfs_insert_delayed_item(struct btrfs_trans_handle *trans,
657 struct btrfs_root *root,
658 struct btrfs_path *path,
659 struct btrfs_delayed_item *first_item)
660{
661 struct btrfs_fs_info *fs_info = root->fs_info;
662 struct btrfs_delayed_node *node = first_item->delayed_node;
663 LIST_HEAD(item_list);
664 struct btrfs_delayed_item *curr;
665 struct btrfs_delayed_item *next;
666 const int max_size = BTRFS_LEAF_DATA_SIZE(fs_info);
667 struct btrfs_item_batch batch;
668 struct btrfs_key first_key;
669 const u32 first_data_size = first_item->data_len;
670 int total_size;
671 char *ins_data = NULL;
672 int ret;
673 bool continuous_keys_only = false;
674
675 lockdep_assert_held(&node->mutex);
676
677 /*
678 * During normal operation the delayed index offset is continuously
679 * increasing, so we can batch insert all items as there will not be any
680 * overlapping keys in the tree.
681 *
682 * The exception to this is log replay, where we may have interleaved
683 * offsets in the tree, so our batch needs to be continuous keys only in
684 * order to ensure we do not end up with out of order items in our leaf.
685 */
686 if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
687 continuous_keys_only = true;
688
689 /*
690 * For delayed items to insert, we track reserved metadata bytes based
691 * on the number of leaves that we will use.
692 * See btrfs_insert_delayed_dir_index() and
693 * btrfs_delayed_item_reserve_metadata()).
694 */
695 ASSERT(first_item->bytes_reserved == 0);
696
697 list_add_tail(&first_item->tree_list, &item_list);
698 batch.total_data_size = first_data_size;
699 batch.nr = 1;
700 total_size = first_data_size + sizeof(struct btrfs_item);
701 curr = first_item;
702
703 while (true) {
704 int next_size;
705
706 next = __btrfs_next_delayed_item(curr);
707 if (!next)
708 break;
709
710 /*
711 * We cannot allow gaps in the key space if we're doing log
712 * replay.
713 */
714 if (continuous_keys_only && (next->index != curr->index + 1))
715 break;
716
717 ASSERT(next->bytes_reserved == 0);
718
719 next_size = next->data_len + sizeof(struct btrfs_item);
720 if (total_size + next_size > max_size)
721 break;
722
723 list_add_tail(&next->tree_list, &item_list);
724 batch.nr++;
725 total_size += next_size;
726 batch.total_data_size += next->data_len;
727 curr = next;
728 }
729
730 if (batch.nr == 1) {
731 first_key.objectid = node->inode_id;
732 first_key.type = BTRFS_DIR_INDEX_KEY;
733 first_key.offset = first_item->index;
734 batch.keys = &first_key;
735 batch.data_sizes = &first_data_size;
736 } else {
737 struct btrfs_key *ins_keys;
738 u32 *ins_sizes;
739 int i = 0;
740
741 ins_data = kmalloc(batch.nr * sizeof(u32) +
742 batch.nr * sizeof(struct btrfs_key), GFP_NOFS);
743 if (!ins_data) {
744 ret = -ENOMEM;
745 goto out;
746 }
747 ins_sizes = (u32 *)ins_data;
748 ins_keys = (struct btrfs_key *)(ins_data + batch.nr * sizeof(u32));
749 batch.keys = ins_keys;
750 batch.data_sizes = ins_sizes;
751 list_for_each_entry(curr, &item_list, tree_list) {
752 ins_keys[i].objectid = node->inode_id;
753 ins_keys[i].type = BTRFS_DIR_INDEX_KEY;
754 ins_keys[i].offset = curr->index;
755 ins_sizes[i] = curr->data_len;
756 i++;
757 }
758 }
759
760 ret = btrfs_insert_empty_items(trans, root, path, &batch);
761 if (ret)
762 goto out;
763
764 list_for_each_entry(curr, &item_list, tree_list) {
765 char *data_ptr;
766
767 data_ptr = btrfs_item_ptr(path->nodes[0], path->slots[0], char);
768 write_extent_buffer(path->nodes[0], &curr->data,
769 (unsigned long)data_ptr, curr->data_len);
770 path->slots[0]++;
771 }
772
773 /*
774 * Now release our path before releasing the delayed items and their
775 * metadata reservations, so that we don't block other tasks for more
776 * time than needed.
777 */
778 btrfs_release_path(path);
779
780 ASSERT(node->index_item_leaves > 0);
781
782 /*
783 * For normal operations we will batch an entire leaf's worth of delayed
784 * items, so if there are more items to process we can decrement
785 * index_item_leaves by 1 as we inserted 1 leaf's worth of items.
786 *
787 * However for log replay we may not have inserted an entire leaf's
788 * worth of items, we may have not had continuous items, so decrementing
789 * here would mess up the index_item_leaves accounting. For this case
790 * only clean up the accounting when there are no items left.
791 */
792 if (next && !continuous_keys_only) {
793 /*
794 * We inserted one batch of items into a leaf a there are more
795 * items to flush in a future batch, now release one unit of
796 * metadata space from the delayed block reserve, corresponding
797 * the leaf we just flushed to.
798 */
799 btrfs_delayed_item_release_leaves(node, 1);
800 node->index_item_leaves--;
801 } else if (!next) {
802 /*
803 * There are no more items to insert. We can have a number of
804 * reserved leaves > 1 here - this happens when many dir index
805 * items are added and then removed before they are flushed (file
806 * names with a very short life, never span a transaction). So
807 * release all remaining leaves.
808 */
809 btrfs_delayed_item_release_leaves(node, node->index_item_leaves);
810 node->index_item_leaves = 0;
811 }
812
813 list_for_each_entry_safe(curr, next, &item_list, tree_list) {
814 list_del(&curr->tree_list);
815 btrfs_release_delayed_item(curr);
816 }
817out:
818 kfree(ins_data);
819 return ret;
820}
821
822static int btrfs_insert_delayed_items(struct btrfs_trans_handle *trans,
823 struct btrfs_path *path,
824 struct btrfs_root *root,
825 struct btrfs_delayed_node *node)
826{
827 int ret = 0;
828
829 while (ret == 0) {
830 struct btrfs_delayed_item *curr;
831
832 mutex_lock(&node->mutex);
833 curr = __btrfs_first_delayed_insertion_item(node);
834 if (!curr) {
835 mutex_unlock(&node->mutex);
836 break;
837 }
838 ret = btrfs_insert_delayed_item(trans, root, path, curr);
839 mutex_unlock(&node->mutex);
840 }
841
842 return ret;
843}
844
845static int btrfs_batch_delete_items(struct btrfs_trans_handle *trans,
846 struct btrfs_root *root,
847 struct btrfs_path *path,
848 struct btrfs_delayed_item *item)
849{
850 const u64 ino = item->delayed_node->inode_id;
851 struct btrfs_fs_info *fs_info = root->fs_info;
852 struct btrfs_delayed_item *curr, *next;
853 struct extent_buffer *leaf = path->nodes[0];
854 LIST_HEAD(batch_list);
855 int nitems, slot, last_slot;
856 int ret;
857 u64 total_reserved_size = item->bytes_reserved;
858
859 ASSERT(leaf != NULL);
860
861 slot = path->slots[0];
862 last_slot = btrfs_header_nritems(leaf) - 1;
863 /*
864 * Our caller always gives us a path pointing to an existing item, so
865 * this can not happen.
866 */
867 ASSERT(slot <= last_slot);
868 if (WARN_ON(slot > last_slot))
869 return -ENOENT;
870
871 nitems = 1;
872 curr = item;
873 list_add_tail(&curr->tree_list, &batch_list);
874
875 /*
876 * Keep checking if the next delayed item matches the next item in the
877 * leaf - if so, we can add it to the batch of items to delete from the
878 * leaf.
879 */
880 while (slot < last_slot) {
881 struct btrfs_key key;
882
883 next = __btrfs_next_delayed_item(curr);
884 if (!next)
885 break;
886
887 slot++;
888 btrfs_item_key_to_cpu(leaf, &key, slot);
889 if (key.objectid != ino ||
890 key.type != BTRFS_DIR_INDEX_KEY ||
891 key.offset != next->index)
892 break;
893 nitems++;
894 curr = next;
895 list_add_tail(&curr->tree_list, &batch_list);
896 total_reserved_size += curr->bytes_reserved;
897 }
898
899 ret = btrfs_del_items(trans, root, path, path->slots[0], nitems);
900 if (ret)
901 return ret;
902
903 /* In case of BTRFS_FS_LOG_RECOVERING items won't have reserved space */
904 if (total_reserved_size > 0) {
905 /*
906 * Check btrfs_delayed_item_reserve_metadata() to see why we
907 * don't need to release/reserve qgroup space.
908 */
909 trace_btrfs_space_reservation(fs_info, "delayed_item", ino,
910 total_reserved_size, 0);
911 btrfs_block_rsv_release(fs_info, &fs_info->delayed_block_rsv,
912 total_reserved_size, NULL);
913 }
914
915 list_for_each_entry_safe(curr, next, &batch_list, tree_list) {
916 list_del(&curr->tree_list);
917 btrfs_release_delayed_item(curr);
918 }
919
920 return 0;
921}
922
923static int btrfs_delete_delayed_items(struct btrfs_trans_handle *trans,
924 struct btrfs_path *path,
925 struct btrfs_root *root,
926 struct btrfs_delayed_node *node)
927{
928 struct btrfs_key key;
929 int ret = 0;
930
931 key.objectid = node->inode_id;
932 key.type = BTRFS_DIR_INDEX_KEY;
933
934 while (ret == 0) {
935 struct btrfs_delayed_item *item;
936
937 mutex_lock(&node->mutex);
938 item = __btrfs_first_delayed_deletion_item(node);
939 if (!item) {
940 mutex_unlock(&node->mutex);
941 break;
942 }
943
944 key.offset = item->index;
945 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
946 if (ret > 0) {
947 /*
948 * There's no matching item in the leaf. This means we
949 * have already deleted this item in a past run of the
950 * delayed items. We ignore errors when running delayed
951 * items from an async context, through a work queue job
952 * running btrfs_async_run_delayed_root(), and don't
953 * release delayed items that failed to complete. This
954 * is because we will retry later, and at transaction
955 * commit time we always run delayed items and will
956 * then deal with errors if they fail to run again.
957 *
958 * So just release delayed items for which we can't find
959 * an item in the tree, and move to the next item.
960 */
961 btrfs_release_path(path);
962 btrfs_release_delayed_item(item);
963 ret = 0;
964 } else if (ret == 0) {
965 ret = btrfs_batch_delete_items(trans, root, path, item);
966 btrfs_release_path(path);
967 }
968
969 /*
970 * We unlock and relock on each iteration, this is to prevent
971 * blocking other tasks for too long while we are being run from
972 * the async context (work queue job). Those tasks are typically
973 * running system calls like creat/mkdir/rename/unlink/etc which
974 * need to add delayed items to this delayed node.
975 */
976 mutex_unlock(&node->mutex);
977 }
978
979 return ret;
980}
981
982static void btrfs_release_delayed_inode(struct btrfs_delayed_node *delayed_node)
983{
984 struct btrfs_delayed_root *delayed_root;
985
986 if (delayed_node &&
987 test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
988 ASSERT(delayed_node->root);
989 clear_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags);
990 delayed_node->count--;
991
992 delayed_root = delayed_node->root->fs_info->delayed_root;
993 finish_one_item(delayed_root);
994 }
995}
996
997static void btrfs_release_delayed_iref(struct btrfs_delayed_node *delayed_node)
998{
999
1000 if (test_and_clear_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags)) {
1001 struct btrfs_delayed_root *delayed_root;
1002
1003 ASSERT(delayed_node->root);
1004 delayed_node->count--;
1005
1006 delayed_root = delayed_node->root->fs_info->delayed_root;
1007 finish_one_item(delayed_root);
1008 }
1009}
1010
1011static int __btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
1012 struct btrfs_root *root,
1013 struct btrfs_path *path,
1014 struct btrfs_delayed_node *node)
1015{
1016 struct btrfs_fs_info *fs_info = root->fs_info;
1017 struct btrfs_key key;
1018 struct btrfs_inode_item *inode_item;
1019 struct extent_buffer *leaf;
1020 int mod;
1021 int ret;
1022
1023 key.objectid = node->inode_id;
1024 key.type = BTRFS_INODE_ITEM_KEY;
1025 key.offset = 0;
1026
1027 if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &node->flags))
1028 mod = -1;
1029 else
1030 mod = 1;
1031
1032 ret = btrfs_lookup_inode(trans, root, path, &key, mod);
1033 if (ret > 0)
1034 ret = -ENOENT;
1035 if (ret < 0)
1036 goto out;
1037
1038 leaf = path->nodes[0];
1039 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1040 struct btrfs_inode_item);
1041 write_extent_buffer(leaf, &node->inode_item, (unsigned long)inode_item,
1042 sizeof(struct btrfs_inode_item));
1043 btrfs_mark_buffer_dirty(trans, leaf);
1044
1045 if (!test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &node->flags))
1046 goto out;
1047
1048 /*
1049 * Now we're going to delete the INODE_REF/EXTREF, which should be the
1050 * only one ref left. Check if the next item is an INODE_REF/EXTREF.
1051 *
1052 * But if we're the last item already, release and search for the last
1053 * INODE_REF/EXTREF.
1054 */
1055 if (path->slots[0] + 1 >= btrfs_header_nritems(leaf)) {
1056 key.objectid = node->inode_id;
1057 key.type = BTRFS_INODE_EXTREF_KEY;
1058 key.offset = (u64)-1;
1059
1060 btrfs_release_path(path);
1061 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
1062 if (ret < 0)
1063 goto err_out;
1064 ASSERT(ret > 0);
1065 ASSERT(path->slots[0] > 0);
1066 ret = 0;
1067 path->slots[0]--;
1068 leaf = path->nodes[0];
1069 } else {
1070 path->slots[0]++;
1071 }
1072 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1073 if (key.objectid != node->inode_id)
1074 goto out;
1075 if (key.type != BTRFS_INODE_REF_KEY &&
1076 key.type != BTRFS_INODE_EXTREF_KEY)
1077 goto out;
1078
1079 /*
1080 * Delayed iref deletion is for the inode who has only one link,
1081 * so there is only one iref. The case that several irefs are
1082 * in the same item doesn't exist.
1083 */
1084 ret = btrfs_del_item(trans, root, path);
1085out:
1086 btrfs_release_delayed_iref(node);
1087 btrfs_release_path(path);
1088err_out:
1089 btrfs_delayed_inode_release_metadata(fs_info, node, (ret < 0));
1090 btrfs_release_delayed_inode(node);
1091
1092 /*
1093 * If we fail to update the delayed inode we need to abort the
1094 * transaction, because we could leave the inode with the improper
1095 * counts behind.
1096 */
1097 if (ret && ret != -ENOENT)
1098 btrfs_abort_transaction(trans, ret);
1099
1100 return ret;
1101}
1102
1103static inline int btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
1104 struct btrfs_root *root,
1105 struct btrfs_path *path,
1106 struct btrfs_delayed_node *node)
1107{
1108 int ret;
1109
1110 mutex_lock(&node->mutex);
1111 if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &node->flags)) {
1112 mutex_unlock(&node->mutex);
1113 return 0;
1114 }
1115
1116 ret = __btrfs_update_delayed_inode(trans, root, path, node);
1117 mutex_unlock(&node->mutex);
1118 return ret;
1119}
1120
1121static inline int
1122__btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
1123 struct btrfs_path *path,
1124 struct btrfs_delayed_node *node)
1125{
1126 int ret;
1127
1128 ret = btrfs_insert_delayed_items(trans, path, node->root, node);
1129 if (ret)
1130 return ret;
1131
1132 ret = btrfs_delete_delayed_items(trans, path, node->root, node);
1133 if (ret)
1134 return ret;
1135
1136 ret = btrfs_record_root_in_trans(trans, node->root);
1137 if (ret)
1138 return ret;
1139 ret = btrfs_update_delayed_inode(trans, node->root, path, node);
1140 return ret;
1141}
1142
1143/*
1144 * Called when committing the transaction.
1145 * Returns 0 on success.
1146 * Returns < 0 on error and returns with an aborted transaction with any
1147 * outstanding delayed items cleaned up.
1148 */
1149static int __btrfs_run_delayed_items(struct btrfs_trans_handle *trans, int nr)
1150{
1151 struct btrfs_fs_info *fs_info = trans->fs_info;
1152 struct btrfs_delayed_root *delayed_root;
1153 struct btrfs_delayed_node *curr_node, *prev_node;
1154 struct btrfs_path *path;
1155 struct btrfs_block_rsv *block_rsv;
1156 int ret = 0;
1157 bool count = (nr > 0);
1158
1159 if (TRANS_ABORTED(trans))
1160 return -EIO;
1161
1162 path = btrfs_alloc_path();
1163 if (!path)
1164 return -ENOMEM;
1165
1166 block_rsv = trans->block_rsv;
1167 trans->block_rsv = &fs_info->delayed_block_rsv;
1168
1169 delayed_root = fs_info->delayed_root;
1170
1171 curr_node = btrfs_first_delayed_node(delayed_root);
1172 while (curr_node && (!count || nr--)) {
1173 ret = __btrfs_commit_inode_delayed_items(trans, path,
1174 curr_node);
1175 if (ret) {
1176 btrfs_abort_transaction(trans, ret);
1177 break;
1178 }
1179
1180 prev_node = curr_node;
1181 curr_node = btrfs_next_delayed_node(curr_node);
1182 /*
1183 * See the comment below about releasing path before releasing
1184 * node. If the commit of delayed items was successful the path
1185 * should always be released, but in case of an error, it may
1186 * point to locked extent buffers (a leaf at the very least).
1187 */
1188 ASSERT(path->nodes[0] == NULL);
1189 btrfs_release_delayed_node(prev_node);
1190 }
1191
1192 /*
1193 * Release the path to avoid a potential deadlock and lockdep splat when
1194 * releasing the delayed node, as that requires taking the delayed node's
1195 * mutex. If another task starts running delayed items before we take
1196 * the mutex, it will first lock the mutex and then it may try to lock
1197 * the same btree path (leaf).
1198 */
1199 btrfs_free_path(path);
1200
1201 if (curr_node)
1202 btrfs_release_delayed_node(curr_node);
1203 trans->block_rsv = block_rsv;
1204
1205 return ret;
1206}
1207
1208int btrfs_run_delayed_items(struct btrfs_trans_handle *trans)
1209{
1210 return __btrfs_run_delayed_items(trans, -1);
1211}
1212
1213int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr)
1214{
1215 return __btrfs_run_delayed_items(trans, nr);
1216}
1217
1218int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
1219 struct btrfs_inode *inode)
1220{
1221 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1222 struct btrfs_path *path;
1223 struct btrfs_block_rsv *block_rsv;
1224 int ret;
1225
1226 if (!delayed_node)
1227 return 0;
1228
1229 mutex_lock(&delayed_node->mutex);
1230 if (!delayed_node->count) {
1231 mutex_unlock(&delayed_node->mutex);
1232 btrfs_release_delayed_node(delayed_node);
1233 return 0;
1234 }
1235 mutex_unlock(&delayed_node->mutex);
1236
1237 path = btrfs_alloc_path();
1238 if (!path) {
1239 btrfs_release_delayed_node(delayed_node);
1240 return -ENOMEM;
1241 }
1242
1243 block_rsv = trans->block_rsv;
1244 trans->block_rsv = &delayed_node->root->fs_info->delayed_block_rsv;
1245
1246 ret = __btrfs_commit_inode_delayed_items(trans, path, delayed_node);
1247
1248 btrfs_release_delayed_node(delayed_node);
1249 btrfs_free_path(path);
1250 trans->block_rsv = block_rsv;
1251
1252 return ret;
1253}
1254
1255int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode)
1256{
1257 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1258 struct btrfs_trans_handle *trans;
1259 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1260 struct btrfs_path *path;
1261 struct btrfs_block_rsv *block_rsv;
1262 int ret;
1263
1264 if (!delayed_node)
1265 return 0;
1266
1267 mutex_lock(&delayed_node->mutex);
1268 if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
1269 mutex_unlock(&delayed_node->mutex);
1270 btrfs_release_delayed_node(delayed_node);
1271 return 0;
1272 }
1273 mutex_unlock(&delayed_node->mutex);
1274
1275 trans = btrfs_join_transaction(delayed_node->root);
1276 if (IS_ERR(trans)) {
1277 ret = PTR_ERR(trans);
1278 goto out;
1279 }
1280
1281 path = btrfs_alloc_path();
1282 if (!path) {
1283 ret = -ENOMEM;
1284 goto trans_out;
1285 }
1286
1287 block_rsv = trans->block_rsv;
1288 trans->block_rsv = &fs_info->delayed_block_rsv;
1289
1290 mutex_lock(&delayed_node->mutex);
1291 if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags))
1292 ret = __btrfs_update_delayed_inode(trans, delayed_node->root,
1293 path, delayed_node);
1294 else
1295 ret = 0;
1296 mutex_unlock(&delayed_node->mutex);
1297
1298 btrfs_free_path(path);
1299 trans->block_rsv = block_rsv;
1300trans_out:
1301 btrfs_end_transaction(trans);
1302 btrfs_btree_balance_dirty(fs_info);
1303out:
1304 btrfs_release_delayed_node(delayed_node);
1305
1306 return ret;
1307}
1308
1309void btrfs_remove_delayed_node(struct btrfs_inode *inode)
1310{
1311 struct btrfs_delayed_node *delayed_node;
1312
1313 delayed_node = READ_ONCE(inode->delayed_node);
1314 if (!delayed_node)
1315 return;
1316
1317 inode->delayed_node = NULL;
1318 btrfs_release_delayed_node(delayed_node);
1319}
1320
1321struct btrfs_async_delayed_work {
1322 struct btrfs_delayed_root *delayed_root;
1323 int nr;
1324 struct btrfs_work work;
1325};
1326
1327static void btrfs_async_run_delayed_root(struct btrfs_work *work)
1328{
1329 struct btrfs_async_delayed_work *async_work;
1330 struct btrfs_delayed_root *delayed_root;
1331 struct btrfs_trans_handle *trans;
1332 struct btrfs_path *path;
1333 struct btrfs_delayed_node *delayed_node = NULL;
1334 struct btrfs_root *root;
1335 struct btrfs_block_rsv *block_rsv;
1336 int total_done = 0;
1337
1338 async_work = container_of(work, struct btrfs_async_delayed_work, work);
1339 delayed_root = async_work->delayed_root;
1340
1341 path = btrfs_alloc_path();
1342 if (!path)
1343 goto out;
1344
1345 do {
1346 if (atomic_read(&delayed_root->items) <
1347 BTRFS_DELAYED_BACKGROUND / 2)
1348 break;
1349
1350 delayed_node = btrfs_first_prepared_delayed_node(delayed_root);
1351 if (!delayed_node)
1352 break;
1353
1354 root = delayed_node->root;
1355
1356 trans = btrfs_join_transaction(root);
1357 if (IS_ERR(trans)) {
1358 btrfs_release_path(path);
1359 btrfs_release_prepared_delayed_node(delayed_node);
1360 total_done++;
1361 continue;
1362 }
1363
1364 block_rsv = trans->block_rsv;
1365 trans->block_rsv = &root->fs_info->delayed_block_rsv;
1366
1367 __btrfs_commit_inode_delayed_items(trans, path, delayed_node);
1368
1369 trans->block_rsv = block_rsv;
1370 btrfs_end_transaction(trans);
1371 btrfs_btree_balance_dirty_nodelay(root->fs_info);
1372
1373 btrfs_release_path(path);
1374 btrfs_release_prepared_delayed_node(delayed_node);
1375 total_done++;
1376
1377 } while ((async_work->nr == 0 && total_done < BTRFS_DELAYED_WRITEBACK)
1378 || total_done < async_work->nr);
1379
1380 btrfs_free_path(path);
1381out:
1382 wake_up(&delayed_root->wait);
1383 kfree(async_work);
1384}
1385
1386
1387static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
1388 struct btrfs_fs_info *fs_info, int nr)
1389{
1390 struct btrfs_async_delayed_work *async_work;
1391
1392 async_work = kmalloc(sizeof(*async_work), GFP_NOFS);
1393 if (!async_work)
1394 return -ENOMEM;
1395
1396 async_work->delayed_root = delayed_root;
1397 btrfs_init_work(&async_work->work, btrfs_async_run_delayed_root, NULL);
1398 async_work->nr = nr;
1399
1400 btrfs_queue_work(fs_info->delayed_workers, &async_work->work);
1401 return 0;
1402}
1403
1404void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info)
1405{
1406 WARN_ON(btrfs_first_delayed_node(fs_info->delayed_root));
1407}
1408
1409static int could_end_wait(struct btrfs_delayed_root *delayed_root, int seq)
1410{
1411 int val = atomic_read(&delayed_root->items_seq);
1412
1413 if (val < seq || val >= seq + BTRFS_DELAYED_BATCH)
1414 return 1;
1415
1416 if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
1417 return 1;
1418
1419 return 0;
1420}
1421
1422void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info)
1423{
1424 struct btrfs_delayed_root *delayed_root = fs_info->delayed_root;
1425
1426 if ((atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND) ||
1427 btrfs_workqueue_normal_congested(fs_info->delayed_workers))
1428 return;
1429
1430 if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
1431 int seq;
1432 int ret;
1433
1434 seq = atomic_read(&delayed_root->items_seq);
1435
1436 ret = btrfs_wq_run_delayed_node(delayed_root, fs_info, 0);
1437 if (ret)
1438 return;
1439
1440 wait_event_interruptible(delayed_root->wait,
1441 could_end_wait(delayed_root, seq));
1442 return;
1443 }
1444
1445 btrfs_wq_run_delayed_node(delayed_root, fs_info, BTRFS_DELAYED_BATCH);
1446}
1447
1448static void btrfs_release_dir_index_item_space(struct btrfs_trans_handle *trans)
1449{
1450 struct btrfs_fs_info *fs_info = trans->fs_info;
1451 const u64 bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
1452
1453 if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
1454 return;
1455
1456 /*
1457 * Adding the new dir index item does not require touching another
1458 * leaf, so we can release 1 unit of metadata that was previously
1459 * reserved when starting the transaction. This applies only to
1460 * the case where we had a transaction start and excludes the
1461 * transaction join case (when replaying log trees).
1462 */
1463 trace_btrfs_space_reservation(fs_info, "transaction",
1464 trans->transid, bytes, 0);
1465 btrfs_block_rsv_release(fs_info, trans->block_rsv, bytes, NULL);
1466 ASSERT(trans->bytes_reserved >= bytes);
1467 trans->bytes_reserved -= bytes;
1468}
1469
1470/* Will return 0, -ENOMEM or -EEXIST (index number collision, unexpected). */
1471int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
1472 const char *name, int name_len,
1473 struct btrfs_inode *dir,
1474 struct btrfs_disk_key *disk_key, u8 flags,
1475 u64 index)
1476{
1477 struct btrfs_fs_info *fs_info = trans->fs_info;
1478 const unsigned int leaf_data_size = BTRFS_LEAF_DATA_SIZE(fs_info);
1479 struct btrfs_delayed_node *delayed_node;
1480 struct btrfs_delayed_item *delayed_item;
1481 struct btrfs_dir_item *dir_item;
1482 bool reserve_leaf_space;
1483 u32 data_len;
1484 int ret;
1485
1486 delayed_node = btrfs_get_or_create_delayed_node(dir);
1487 if (IS_ERR(delayed_node))
1488 return PTR_ERR(delayed_node);
1489
1490 delayed_item = btrfs_alloc_delayed_item(sizeof(*dir_item) + name_len,
1491 delayed_node,
1492 BTRFS_DELAYED_INSERTION_ITEM);
1493 if (!delayed_item) {
1494 ret = -ENOMEM;
1495 goto release_node;
1496 }
1497
1498 delayed_item->index = index;
1499
1500 dir_item = (struct btrfs_dir_item *)delayed_item->data;
1501 dir_item->location = *disk_key;
1502 btrfs_set_stack_dir_transid(dir_item, trans->transid);
1503 btrfs_set_stack_dir_data_len(dir_item, 0);
1504 btrfs_set_stack_dir_name_len(dir_item, name_len);
1505 btrfs_set_stack_dir_flags(dir_item, flags);
1506 memcpy((char *)(dir_item + 1), name, name_len);
1507
1508 data_len = delayed_item->data_len + sizeof(struct btrfs_item);
1509
1510 mutex_lock(&delayed_node->mutex);
1511
1512 /*
1513 * First attempt to insert the delayed item. This is to make the error
1514 * handling path simpler in case we fail (-EEXIST). There's no risk of
1515 * any other task coming in and running the delayed item before we do
1516 * the metadata space reservation below, because we are holding the
1517 * delayed node's mutex and that mutex must also be locked before the
1518 * node's delayed items can be run.
1519 */
1520 ret = __btrfs_add_delayed_item(delayed_node, delayed_item);
1521 if (unlikely(ret)) {
1522 btrfs_err(trans->fs_info,
1523"error adding delayed dir index item, name: %.*s, index: %llu, root: %llu, dir: %llu, dir->index_cnt: %llu, delayed_node->index_cnt: %llu, error: %d",
1524 name_len, name, index, btrfs_root_id(delayed_node->root),
1525 delayed_node->inode_id, dir->index_cnt,
1526 delayed_node->index_cnt, ret);
1527 btrfs_release_delayed_item(delayed_item);
1528 btrfs_release_dir_index_item_space(trans);
1529 mutex_unlock(&delayed_node->mutex);
1530 goto release_node;
1531 }
1532
1533 if (delayed_node->index_item_leaves == 0 ||
1534 delayed_node->curr_index_batch_size + data_len > leaf_data_size) {
1535 delayed_node->curr_index_batch_size = data_len;
1536 reserve_leaf_space = true;
1537 } else {
1538 delayed_node->curr_index_batch_size += data_len;
1539 reserve_leaf_space = false;
1540 }
1541
1542 if (reserve_leaf_space) {
1543 ret = btrfs_delayed_item_reserve_metadata(trans, delayed_item);
1544 /*
1545 * Space was reserved for a dir index item insertion when we
1546 * started the transaction, so getting a failure here should be
1547 * impossible.
1548 */
1549 if (WARN_ON(ret)) {
1550 btrfs_release_delayed_item(delayed_item);
1551 mutex_unlock(&delayed_node->mutex);
1552 goto release_node;
1553 }
1554
1555 delayed_node->index_item_leaves++;
1556 } else {
1557 btrfs_release_dir_index_item_space(trans);
1558 }
1559 mutex_unlock(&delayed_node->mutex);
1560
1561release_node:
1562 btrfs_release_delayed_node(delayed_node);
1563 return ret;
1564}
1565
1566static int btrfs_delete_delayed_insertion_item(struct btrfs_fs_info *fs_info,
1567 struct btrfs_delayed_node *node,
1568 u64 index)
1569{
1570 struct btrfs_delayed_item *item;
1571
1572 mutex_lock(&node->mutex);
1573 item = __btrfs_lookup_delayed_item(&node->ins_root.rb_root, index);
1574 if (!item) {
1575 mutex_unlock(&node->mutex);
1576 return 1;
1577 }
1578
1579 /*
1580 * For delayed items to insert, we track reserved metadata bytes based
1581 * on the number of leaves that we will use.
1582 * See btrfs_insert_delayed_dir_index() and
1583 * btrfs_delayed_item_reserve_metadata()).
1584 */
1585 ASSERT(item->bytes_reserved == 0);
1586 ASSERT(node->index_item_leaves > 0);
1587
1588 /*
1589 * If there's only one leaf reserved, we can decrement this item from the
1590 * current batch, otherwise we can not because we don't know which leaf
1591 * it belongs to. With the current limit on delayed items, we rarely
1592 * accumulate enough dir index items to fill more than one leaf (even
1593 * when using a leaf size of 4K).
1594 */
1595 if (node->index_item_leaves == 1) {
1596 const u32 data_len = item->data_len + sizeof(struct btrfs_item);
1597
1598 ASSERT(node->curr_index_batch_size >= data_len);
1599 node->curr_index_batch_size -= data_len;
1600 }
1601
1602 btrfs_release_delayed_item(item);
1603
1604 /* If we now have no more dir index items, we can release all leaves. */
1605 if (RB_EMPTY_ROOT(&node->ins_root.rb_root)) {
1606 btrfs_delayed_item_release_leaves(node, node->index_item_leaves);
1607 node->index_item_leaves = 0;
1608 }
1609
1610 mutex_unlock(&node->mutex);
1611 return 0;
1612}
1613
1614int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
1615 struct btrfs_inode *dir, u64 index)
1616{
1617 struct btrfs_delayed_node *node;
1618 struct btrfs_delayed_item *item;
1619 int ret;
1620
1621 node = btrfs_get_or_create_delayed_node(dir);
1622 if (IS_ERR(node))
1623 return PTR_ERR(node);
1624
1625 ret = btrfs_delete_delayed_insertion_item(trans->fs_info, node, index);
1626 if (!ret)
1627 goto end;
1628
1629 item = btrfs_alloc_delayed_item(0, node, BTRFS_DELAYED_DELETION_ITEM);
1630 if (!item) {
1631 ret = -ENOMEM;
1632 goto end;
1633 }
1634
1635 item->index = index;
1636
1637 ret = btrfs_delayed_item_reserve_metadata(trans, item);
1638 /*
1639 * we have reserved enough space when we start a new transaction,
1640 * so reserving metadata failure is impossible.
1641 */
1642 if (ret < 0) {
1643 btrfs_err(trans->fs_info,
1644"metadata reservation failed for delayed dir item deltiona, should have been reserved");
1645 btrfs_release_delayed_item(item);
1646 goto end;
1647 }
1648
1649 mutex_lock(&node->mutex);
1650 ret = __btrfs_add_delayed_item(node, item);
1651 if (unlikely(ret)) {
1652 btrfs_err(trans->fs_info,
1653 "err add delayed dir index item(index: %llu) into the deletion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)",
1654 index, node->root->root_key.objectid,
1655 node->inode_id, ret);
1656 btrfs_delayed_item_release_metadata(dir->root, item);
1657 btrfs_release_delayed_item(item);
1658 }
1659 mutex_unlock(&node->mutex);
1660end:
1661 btrfs_release_delayed_node(node);
1662 return ret;
1663}
1664
1665int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode)
1666{
1667 struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
1668
1669 if (!delayed_node)
1670 return -ENOENT;
1671
1672 /*
1673 * Since we have held i_mutex of this directory, it is impossible that
1674 * a new directory index is added into the delayed node and index_cnt
1675 * is updated now. So we needn't lock the delayed node.
1676 */
1677 if (!delayed_node->index_cnt) {
1678 btrfs_release_delayed_node(delayed_node);
1679 return -EINVAL;
1680 }
1681
1682 inode->index_cnt = delayed_node->index_cnt;
1683 btrfs_release_delayed_node(delayed_node);
1684 return 0;
1685}
1686
1687bool btrfs_readdir_get_delayed_items(struct inode *inode,
1688 u64 last_index,
1689 struct list_head *ins_list,
1690 struct list_head *del_list)
1691{
1692 struct btrfs_delayed_node *delayed_node;
1693 struct btrfs_delayed_item *item;
1694
1695 delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
1696 if (!delayed_node)
1697 return false;
1698
1699 /*
1700 * We can only do one readdir with delayed items at a time because of
1701 * item->readdir_list.
1702 */
1703 btrfs_inode_unlock(BTRFS_I(inode), BTRFS_ILOCK_SHARED);
1704 btrfs_inode_lock(BTRFS_I(inode), 0);
1705
1706 mutex_lock(&delayed_node->mutex);
1707 item = __btrfs_first_delayed_insertion_item(delayed_node);
1708 while (item && item->index <= last_index) {
1709 refcount_inc(&item->refs);
1710 list_add_tail(&item->readdir_list, ins_list);
1711 item = __btrfs_next_delayed_item(item);
1712 }
1713
1714 item = __btrfs_first_delayed_deletion_item(delayed_node);
1715 while (item && item->index <= last_index) {
1716 refcount_inc(&item->refs);
1717 list_add_tail(&item->readdir_list, del_list);
1718 item = __btrfs_next_delayed_item(item);
1719 }
1720 mutex_unlock(&delayed_node->mutex);
1721 /*
1722 * This delayed node is still cached in the btrfs inode, so refs
1723 * must be > 1 now, and we needn't check it is going to be freed
1724 * or not.
1725 *
1726 * Besides that, this function is used to read dir, we do not
1727 * insert/delete delayed items in this period. So we also needn't
1728 * requeue or dequeue this delayed node.
1729 */
1730 refcount_dec(&delayed_node->refs);
1731
1732 return true;
1733}
1734
1735void btrfs_readdir_put_delayed_items(struct inode *inode,
1736 struct list_head *ins_list,
1737 struct list_head *del_list)
1738{
1739 struct btrfs_delayed_item *curr, *next;
1740
1741 list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
1742 list_del(&curr->readdir_list);
1743 if (refcount_dec_and_test(&curr->refs))
1744 kfree(curr);
1745 }
1746
1747 list_for_each_entry_safe(curr, next, del_list, readdir_list) {
1748 list_del(&curr->readdir_list);
1749 if (refcount_dec_and_test(&curr->refs))
1750 kfree(curr);
1751 }
1752
1753 /*
1754 * The VFS is going to do up_read(), so we need to downgrade back to a
1755 * read lock.
1756 */
1757 downgrade_write(&inode->i_rwsem);
1758}
1759
1760int btrfs_should_delete_dir_index(struct list_head *del_list,
1761 u64 index)
1762{
1763 struct btrfs_delayed_item *curr;
1764 int ret = 0;
1765
1766 list_for_each_entry(curr, del_list, readdir_list) {
1767 if (curr->index > index)
1768 break;
1769 if (curr->index == index) {
1770 ret = 1;
1771 break;
1772 }
1773 }
1774 return ret;
1775}
1776
1777/*
1778 * Read dir info stored in the delayed tree.
1779 */
1780int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
1781 struct list_head *ins_list)
1782{
1783 struct btrfs_dir_item *di;
1784 struct btrfs_delayed_item *curr, *next;
1785 struct btrfs_key location;
1786 char *name;
1787 int name_len;
1788 int over = 0;
1789 unsigned char d_type;
1790
1791 /*
1792 * Changing the data of the delayed item is impossible. So
1793 * we needn't lock them. And we have held i_mutex of the
1794 * directory, nobody can delete any directory indexes now.
1795 */
1796 list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
1797 list_del(&curr->readdir_list);
1798
1799 if (curr->index < ctx->pos) {
1800 if (refcount_dec_and_test(&curr->refs))
1801 kfree(curr);
1802 continue;
1803 }
1804
1805 ctx->pos = curr->index;
1806
1807 di = (struct btrfs_dir_item *)curr->data;
1808 name = (char *)(di + 1);
1809 name_len = btrfs_stack_dir_name_len(di);
1810
1811 d_type = fs_ftype_to_dtype(btrfs_dir_flags_to_ftype(di->type));
1812 btrfs_disk_key_to_cpu(&location, &di->location);
1813
1814 over = !dir_emit(ctx, name, name_len,
1815 location.objectid, d_type);
1816
1817 if (refcount_dec_and_test(&curr->refs))
1818 kfree(curr);
1819
1820 if (over)
1821 return 1;
1822 ctx->pos++;
1823 }
1824 return 0;
1825}
1826
1827static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
1828 struct btrfs_inode_item *inode_item,
1829 struct inode *inode)
1830{
1831 u64 flags;
1832
1833 btrfs_set_stack_inode_uid(inode_item, i_uid_read(inode));
1834 btrfs_set_stack_inode_gid(inode_item, i_gid_read(inode));
1835 btrfs_set_stack_inode_size(inode_item, BTRFS_I(inode)->disk_i_size);
1836 btrfs_set_stack_inode_mode(inode_item, inode->i_mode);
1837 btrfs_set_stack_inode_nlink(inode_item, inode->i_nlink);
1838 btrfs_set_stack_inode_nbytes(inode_item, inode_get_bytes(inode));
1839 btrfs_set_stack_inode_generation(inode_item,
1840 BTRFS_I(inode)->generation);
1841 btrfs_set_stack_inode_sequence(inode_item,
1842 inode_peek_iversion(inode));
1843 btrfs_set_stack_inode_transid(inode_item, trans->transid);
1844 btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
1845 flags = btrfs_inode_combine_flags(BTRFS_I(inode)->flags,
1846 BTRFS_I(inode)->ro_flags);
1847 btrfs_set_stack_inode_flags(inode_item, flags);
1848 btrfs_set_stack_inode_block_group(inode_item, 0);
1849
1850 btrfs_set_stack_timespec_sec(&inode_item->atime,
1851 inode_get_atime_sec(inode));
1852 btrfs_set_stack_timespec_nsec(&inode_item->atime,
1853 inode_get_atime_nsec(inode));
1854
1855 btrfs_set_stack_timespec_sec(&inode_item->mtime,
1856 inode_get_mtime_sec(inode));
1857 btrfs_set_stack_timespec_nsec(&inode_item->mtime,
1858 inode_get_mtime_nsec(inode));
1859
1860 btrfs_set_stack_timespec_sec(&inode_item->ctime,
1861 inode_get_ctime_sec(inode));
1862 btrfs_set_stack_timespec_nsec(&inode_item->ctime,
1863 inode_get_ctime_nsec(inode));
1864
1865 btrfs_set_stack_timespec_sec(&inode_item->otime, BTRFS_I(inode)->i_otime_sec);
1866 btrfs_set_stack_timespec_nsec(&inode_item->otime, BTRFS_I(inode)->i_otime_nsec);
1867}
1868
1869int btrfs_fill_inode(struct inode *inode, u32 *rdev)
1870{
1871 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
1872 struct btrfs_delayed_node *delayed_node;
1873 struct btrfs_inode_item *inode_item;
1874
1875 delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
1876 if (!delayed_node)
1877 return -ENOENT;
1878
1879 mutex_lock(&delayed_node->mutex);
1880 if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
1881 mutex_unlock(&delayed_node->mutex);
1882 btrfs_release_delayed_node(delayed_node);
1883 return -ENOENT;
1884 }
1885
1886 inode_item = &delayed_node->inode_item;
1887
1888 i_uid_write(inode, btrfs_stack_inode_uid(inode_item));
1889 i_gid_write(inode, btrfs_stack_inode_gid(inode_item));
1890 btrfs_i_size_write(BTRFS_I(inode), btrfs_stack_inode_size(inode_item));
1891 btrfs_inode_set_file_extent_range(BTRFS_I(inode), 0,
1892 round_up(i_size_read(inode), fs_info->sectorsize));
1893 inode->i_mode = btrfs_stack_inode_mode(inode_item);
1894 set_nlink(inode, btrfs_stack_inode_nlink(inode_item));
1895 inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
1896 BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
1897 BTRFS_I(inode)->last_trans = btrfs_stack_inode_transid(inode_item);
1898
1899 inode_set_iversion_queried(inode,
1900 btrfs_stack_inode_sequence(inode_item));
1901 inode->i_rdev = 0;
1902 *rdev = btrfs_stack_inode_rdev(inode_item);
1903 btrfs_inode_split_flags(btrfs_stack_inode_flags(inode_item),
1904 &BTRFS_I(inode)->flags, &BTRFS_I(inode)->ro_flags);
1905
1906 inode_set_atime(inode, btrfs_stack_timespec_sec(&inode_item->atime),
1907 btrfs_stack_timespec_nsec(&inode_item->atime));
1908
1909 inode_set_mtime(inode, btrfs_stack_timespec_sec(&inode_item->mtime),
1910 btrfs_stack_timespec_nsec(&inode_item->mtime));
1911
1912 inode_set_ctime(inode, btrfs_stack_timespec_sec(&inode_item->ctime),
1913 btrfs_stack_timespec_nsec(&inode_item->ctime));
1914
1915 BTRFS_I(inode)->i_otime_sec = btrfs_stack_timespec_sec(&inode_item->otime);
1916 BTRFS_I(inode)->i_otime_nsec = btrfs_stack_timespec_nsec(&inode_item->otime);
1917
1918 inode->i_generation = BTRFS_I(inode)->generation;
1919 BTRFS_I(inode)->index_cnt = (u64)-1;
1920
1921 mutex_unlock(&delayed_node->mutex);
1922 btrfs_release_delayed_node(delayed_node);
1923 return 0;
1924}
1925
1926int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
1927 struct btrfs_inode *inode)
1928{
1929 struct btrfs_root *root = inode->root;
1930 struct btrfs_delayed_node *delayed_node;
1931 int ret = 0;
1932
1933 delayed_node = btrfs_get_or_create_delayed_node(inode);
1934 if (IS_ERR(delayed_node))
1935 return PTR_ERR(delayed_node);
1936
1937 mutex_lock(&delayed_node->mutex);
1938 if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
1939 fill_stack_inode_item(trans, &delayed_node->inode_item,
1940 &inode->vfs_inode);
1941 goto release_node;
1942 }
1943
1944 ret = btrfs_delayed_inode_reserve_metadata(trans, root, delayed_node);
1945 if (ret)
1946 goto release_node;
1947
1948 fill_stack_inode_item(trans, &delayed_node->inode_item, &inode->vfs_inode);
1949 set_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags);
1950 delayed_node->count++;
1951 atomic_inc(&root->fs_info->delayed_root->items);
1952release_node:
1953 mutex_unlock(&delayed_node->mutex);
1954 btrfs_release_delayed_node(delayed_node);
1955 return ret;
1956}
1957
1958int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode)
1959{
1960 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1961 struct btrfs_delayed_node *delayed_node;
1962
1963 /*
1964 * we don't do delayed inode updates during log recovery because it
1965 * leads to enospc problems. This means we also can't do
1966 * delayed inode refs
1967 */
1968 if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
1969 return -EAGAIN;
1970
1971 delayed_node = btrfs_get_or_create_delayed_node(inode);
1972 if (IS_ERR(delayed_node))
1973 return PTR_ERR(delayed_node);
1974
1975 /*
1976 * We don't reserve space for inode ref deletion is because:
1977 * - We ONLY do async inode ref deletion for the inode who has only
1978 * one link(i_nlink == 1), it means there is only one inode ref.
1979 * And in most case, the inode ref and the inode item are in the
1980 * same leaf, and we will deal with them at the same time.
1981 * Since we are sure we will reserve the space for the inode item,
1982 * it is unnecessary to reserve space for inode ref deletion.
1983 * - If the inode ref and the inode item are not in the same leaf,
1984 * We also needn't worry about enospc problem, because we reserve
1985 * much more space for the inode update than it needs.
1986 * - At the worst, we can steal some space from the global reservation.
1987 * It is very rare.
1988 */
1989 mutex_lock(&delayed_node->mutex);
1990 if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags))
1991 goto release_node;
1992
1993 set_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags);
1994 delayed_node->count++;
1995 atomic_inc(&fs_info->delayed_root->items);
1996release_node:
1997 mutex_unlock(&delayed_node->mutex);
1998 btrfs_release_delayed_node(delayed_node);
1999 return 0;
2000}
2001
2002static void __btrfs_kill_delayed_node(struct btrfs_delayed_node *delayed_node)
2003{
2004 struct btrfs_root *root = delayed_node->root;
2005 struct btrfs_fs_info *fs_info = root->fs_info;
2006 struct btrfs_delayed_item *curr_item, *prev_item;
2007
2008 mutex_lock(&delayed_node->mutex);
2009 curr_item = __btrfs_first_delayed_insertion_item(delayed_node);
2010 while (curr_item) {
2011 prev_item = curr_item;
2012 curr_item = __btrfs_next_delayed_item(prev_item);
2013 btrfs_release_delayed_item(prev_item);
2014 }
2015
2016 if (delayed_node->index_item_leaves > 0) {
2017 btrfs_delayed_item_release_leaves(delayed_node,
2018 delayed_node->index_item_leaves);
2019 delayed_node->index_item_leaves = 0;
2020 }
2021
2022 curr_item = __btrfs_first_delayed_deletion_item(delayed_node);
2023 while (curr_item) {
2024 btrfs_delayed_item_release_metadata(root, curr_item);
2025 prev_item = curr_item;
2026 curr_item = __btrfs_next_delayed_item(prev_item);
2027 btrfs_release_delayed_item(prev_item);
2028 }
2029
2030 btrfs_release_delayed_iref(delayed_node);
2031
2032 if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
2033 btrfs_delayed_inode_release_metadata(fs_info, delayed_node, false);
2034 btrfs_release_delayed_inode(delayed_node);
2035 }
2036 mutex_unlock(&delayed_node->mutex);
2037}
2038
2039void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode)
2040{
2041 struct btrfs_delayed_node *delayed_node;
2042
2043 delayed_node = btrfs_get_delayed_node(inode);
2044 if (!delayed_node)
2045 return;
2046
2047 __btrfs_kill_delayed_node(delayed_node);
2048 btrfs_release_delayed_node(delayed_node);
2049}
2050
2051void btrfs_kill_all_delayed_nodes(struct btrfs_root *root)
2052{
2053 unsigned long index = 0;
2054 struct btrfs_delayed_node *delayed_nodes[8];
2055
2056 while (1) {
2057 struct btrfs_delayed_node *node;
2058 int count;
2059
2060 spin_lock(&root->inode_lock);
2061 if (xa_empty(&root->delayed_nodes)) {
2062 spin_unlock(&root->inode_lock);
2063 return;
2064 }
2065
2066 count = 0;
2067 xa_for_each_start(&root->delayed_nodes, index, node, index) {
2068 /*
2069 * Don't increase refs in case the node is dead and
2070 * about to be removed from the tree in the loop below
2071 */
2072 if (refcount_inc_not_zero(&node->refs)) {
2073 delayed_nodes[count] = node;
2074 count++;
2075 }
2076 if (count >= ARRAY_SIZE(delayed_nodes))
2077 break;
2078 }
2079 spin_unlock(&root->inode_lock);
2080 index++;
2081
2082 for (int i = 0; i < count; i++) {
2083 __btrfs_kill_delayed_node(delayed_nodes[i]);
2084 btrfs_release_delayed_node(delayed_nodes[i]);
2085 }
2086 }
2087}
2088
2089void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info)
2090{
2091 struct btrfs_delayed_node *curr_node, *prev_node;
2092
2093 curr_node = btrfs_first_delayed_node(fs_info->delayed_root);
2094 while (curr_node) {
2095 __btrfs_kill_delayed_node(curr_node);
2096
2097 prev_node = curr_node;
2098 curr_node = btrfs_next_delayed_node(curr_node);
2099 btrfs_release_delayed_node(prev_node);
2100 }
2101}
2102
2103void btrfs_log_get_delayed_items(struct btrfs_inode *inode,
2104 struct list_head *ins_list,
2105 struct list_head *del_list)
2106{
2107 struct btrfs_delayed_node *node;
2108 struct btrfs_delayed_item *item;
2109
2110 node = btrfs_get_delayed_node(inode);
2111 if (!node)
2112 return;
2113
2114 mutex_lock(&node->mutex);
2115 item = __btrfs_first_delayed_insertion_item(node);
2116 while (item) {
2117 /*
2118 * It's possible that the item is already in a log list. This
2119 * can happen in case two tasks are trying to log the same
2120 * directory. For example if we have tasks A and task B:
2121 *
2122 * Task A collected the delayed items into a log list while
2123 * under the inode's log_mutex (at btrfs_log_inode()), but it
2124 * only releases the items after logging the inodes they point
2125 * to (if they are new inodes), which happens after unlocking
2126 * the log mutex;
2127 *
2128 * Task B enters btrfs_log_inode() and acquires the log_mutex
2129 * of the same directory inode, before task B releases the
2130 * delayed items. This can happen for example when logging some
2131 * inode we need to trigger logging of its parent directory, so
2132 * logging two files that have the same parent directory can
2133 * lead to this.
2134 *
2135 * If this happens, just ignore delayed items already in a log
2136 * list. All the tasks logging the directory are under a log
2137 * transaction and whichever finishes first can not sync the log
2138 * before the other completes and leaves the log transaction.
2139 */
2140 if (!item->logged && list_empty(&item->log_list)) {
2141 refcount_inc(&item->refs);
2142 list_add_tail(&item->log_list, ins_list);
2143 }
2144 item = __btrfs_next_delayed_item(item);
2145 }
2146
2147 item = __btrfs_first_delayed_deletion_item(node);
2148 while (item) {
2149 /* It may be non-empty, for the same reason mentioned above. */
2150 if (!item->logged && list_empty(&item->log_list)) {
2151 refcount_inc(&item->refs);
2152 list_add_tail(&item->log_list, del_list);
2153 }
2154 item = __btrfs_next_delayed_item(item);
2155 }
2156 mutex_unlock(&node->mutex);
2157
2158 /*
2159 * We are called during inode logging, which means the inode is in use
2160 * and can not be evicted before we finish logging the inode. So we never
2161 * have the last reference on the delayed inode.
2162 * Also, we don't use btrfs_release_delayed_node() because that would
2163 * requeue the delayed inode (change its order in the list of prepared
2164 * nodes) and we don't want to do such change because we don't create or
2165 * delete delayed items.
2166 */
2167 ASSERT(refcount_read(&node->refs) > 1);
2168 refcount_dec(&node->refs);
2169}
2170
2171void btrfs_log_put_delayed_items(struct btrfs_inode *inode,
2172 struct list_head *ins_list,
2173 struct list_head *del_list)
2174{
2175 struct btrfs_delayed_node *node;
2176 struct btrfs_delayed_item *item;
2177 struct btrfs_delayed_item *next;
2178
2179 node = btrfs_get_delayed_node(inode);
2180 if (!node)
2181 return;
2182
2183 mutex_lock(&node->mutex);
2184
2185 list_for_each_entry_safe(item, next, ins_list, log_list) {
2186 item->logged = true;
2187 list_del_init(&item->log_list);
2188 if (refcount_dec_and_test(&item->refs))
2189 kfree(item);
2190 }
2191
2192 list_for_each_entry_safe(item, next, del_list, log_list) {
2193 item->logged = true;
2194 list_del_init(&item->log_list);
2195 if (refcount_dec_and_test(&item->refs))
2196 kfree(item);
2197 }
2198
2199 mutex_unlock(&node->mutex);
2200
2201 /*
2202 * We are called during inode logging, which means the inode is in use
2203 * and can not be evicted before we finish logging the inode. So we never
2204 * have the last reference on the delayed inode.
2205 * Also, we don't use btrfs_release_delayed_node() because that would
2206 * requeue the delayed inode (change its order in the list of prepared
2207 * nodes) and we don't want to do such change because we don't create or
2208 * delete delayed items.
2209 */
2210 ASSERT(refcount_read(&node->refs) > 1);
2211 refcount_dec(&node->refs);
2212}