1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/slab.h>
7 #include <linux/blkdev.h>
8 #include <linux/writeback.h>
9 #include <linux/sched/mm.h>
12 #include "transaction.h"
13 #include "btrfs_inode.h"
14 #include "extent_io.h"
16 #include "compression.h"
17 #include "delalloc-space.h"
19 static struct kmem_cache *btrfs_ordered_extent_cache;
21 static u64 entry_end(struct btrfs_ordered_extent *entry)
23 if (entry->file_offset + entry->len < entry->file_offset)
25 return entry->file_offset + entry->len;
28 /* returns NULL if the insertion worked, or it returns the node it did find
31 static struct rb_node *tree_insert(struct rb_root *root, u64 file_offset,
34 struct rb_node **p = &root->rb_node;
35 struct rb_node *parent = NULL;
36 struct btrfs_ordered_extent *entry;
40 entry = rb_entry(parent, struct btrfs_ordered_extent, rb_node);
42 if (file_offset < entry->file_offset)
44 else if (file_offset >= entry_end(entry))
50 rb_link_node(node, parent, p);
51 rb_insert_color(node, root);
55 static void ordered_data_tree_panic(struct inode *inode, int errno,
58 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
59 btrfs_panic(fs_info, errno,
60 "Inconsistency in ordered tree at offset %llu", offset);
64 * look for a given offset in the tree, and if it can't be found return the
67 static struct rb_node *__tree_search(struct rb_root *root, u64 file_offset,
68 struct rb_node **prev_ret)
70 struct rb_node *n = root->rb_node;
71 struct rb_node *prev = NULL;
73 struct btrfs_ordered_extent *entry;
74 struct btrfs_ordered_extent *prev_entry = NULL;
77 entry = rb_entry(n, struct btrfs_ordered_extent, rb_node);
81 if (file_offset < entry->file_offset)
83 else if (file_offset >= entry_end(entry))
91 while (prev && file_offset >= entry_end(prev_entry)) {
95 prev_entry = rb_entry(test, struct btrfs_ordered_extent,
97 if (file_offset < entry_end(prev_entry))
103 prev_entry = rb_entry(prev, struct btrfs_ordered_extent,
105 while (prev && file_offset < entry_end(prev_entry)) {
106 test = rb_prev(prev);
109 prev_entry = rb_entry(test, struct btrfs_ordered_extent,
118 * helper to check if a given offset is inside a given entry
120 static int offset_in_entry(struct btrfs_ordered_extent *entry, u64 file_offset)
122 if (file_offset < entry->file_offset ||
123 entry->file_offset + entry->len <= file_offset)
128 static int range_overlaps(struct btrfs_ordered_extent *entry, u64 file_offset,
131 if (file_offset + len <= entry->file_offset ||
132 entry->file_offset + entry->len <= file_offset)
138 * look find the first ordered struct that has this offset, otherwise
139 * the first one less than this offset
141 static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
144 struct rb_root *root = &tree->tree;
145 struct rb_node *prev = NULL;
147 struct btrfs_ordered_extent *entry;
150 entry = rb_entry(tree->last, struct btrfs_ordered_extent,
152 if (offset_in_entry(entry, file_offset))
155 ret = __tree_search(root, file_offset, &prev);
163 /* allocate and add a new ordered_extent into the per-inode tree.
164 * file_offset is the logical offset in the file
166 * start is the disk block number of an extent already reserved in the
167 * extent allocation tree
169 * len is the length of the extent
171 * The tree is given a single reference on the ordered extent that was
174 static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
175 u64 start, u64 len, u64 disk_len,
176 int type, int dio, int compress_type)
178 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
179 struct btrfs_root *root = BTRFS_I(inode)->root;
180 struct btrfs_ordered_inode_tree *tree;
181 struct rb_node *node;
182 struct btrfs_ordered_extent *entry;
184 tree = &BTRFS_I(inode)->ordered_tree;
185 entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS);
189 entry->file_offset = file_offset;
190 entry->start = start;
192 entry->disk_len = disk_len;
193 entry->bytes_left = len;
194 entry->inode = igrab(inode);
195 entry->compress_type = compress_type;
196 entry->truncated_len = (u64)-1;
197 if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
198 set_bit(type, &entry->flags);
201 percpu_counter_add_batch(&fs_info->dio_bytes, len,
202 fs_info->delalloc_batch);
203 set_bit(BTRFS_ORDERED_DIRECT, &entry->flags);
206 /* one ref for the tree */
207 refcount_set(&entry->refs, 1);
208 init_waitqueue_head(&entry->wait);
209 INIT_LIST_HEAD(&entry->list);
210 INIT_LIST_HEAD(&entry->root_extent_list);
211 INIT_LIST_HEAD(&entry->work_list);
212 init_completion(&entry->completion);
213 INIT_LIST_HEAD(&entry->log_list);
214 INIT_LIST_HEAD(&entry->trans_list);
216 trace_btrfs_ordered_extent_add(inode, entry);
218 spin_lock_irq(&tree->lock);
219 node = tree_insert(&tree->tree, file_offset,
222 ordered_data_tree_panic(inode, -EEXIST, file_offset);
223 spin_unlock_irq(&tree->lock);
225 spin_lock(&root->ordered_extent_lock);
226 list_add_tail(&entry->root_extent_list,
227 &root->ordered_extents);
228 root->nr_ordered_extents++;
229 if (root->nr_ordered_extents == 1) {
230 spin_lock(&fs_info->ordered_root_lock);
231 BUG_ON(!list_empty(&root->ordered_root));
232 list_add_tail(&root->ordered_root, &fs_info->ordered_roots);
233 spin_unlock(&fs_info->ordered_root_lock);
235 spin_unlock(&root->ordered_extent_lock);
238 * We don't need the count_max_extents here, we can assume that all of
239 * that work has been done at higher layers, so this is truly the
240 * smallest the extent is going to get.
242 spin_lock(&BTRFS_I(inode)->lock);
243 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
244 spin_unlock(&BTRFS_I(inode)->lock);
249 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
250 u64 start, u64 len, u64 disk_len, int type)
252 return __btrfs_add_ordered_extent(inode, file_offset, start, len,
254 BTRFS_COMPRESS_NONE);
257 int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
258 u64 start, u64 len, u64 disk_len, int type)
260 return __btrfs_add_ordered_extent(inode, file_offset, start, len,
262 BTRFS_COMPRESS_NONE);
265 int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
266 u64 start, u64 len, u64 disk_len,
267 int type, int compress_type)
269 return __btrfs_add_ordered_extent(inode, file_offset, start, len,
275 * Add a struct btrfs_ordered_sum into the list of checksums to be inserted
276 * when an ordered extent is finished. If the list covers more than one
277 * ordered extent, it is split across multiples.
279 void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry,
280 struct btrfs_ordered_sum *sum)
282 struct btrfs_ordered_inode_tree *tree;
284 tree = &BTRFS_I(entry->inode)->ordered_tree;
285 spin_lock_irq(&tree->lock);
286 list_add_tail(&sum->list, &entry->list);
287 spin_unlock_irq(&tree->lock);
291 * this is used to account for finished IO across a given range
292 * of the file. The IO may span ordered extents. If
293 * a given ordered_extent is completely done, 1 is returned, otherwise
296 * test_and_set_bit on a flag in the struct btrfs_ordered_extent is used
297 * to make sure this function only returns 1 once for a given ordered extent.
299 * file_offset is updated to one byte past the range that is recorded as
300 * complete. This allows you to walk forward in the file.
302 int btrfs_dec_test_first_ordered_pending(struct inode *inode,
303 struct btrfs_ordered_extent **cached,
304 u64 *file_offset, u64 io_size, int uptodate)
306 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
307 struct btrfs_ordered_inode_tree *tree;
308 struct rb_node *node;
309 struct btrfs_ordered_extent *entry = NULL;
316 tree = &BTRFS_I(inode)->ordered_tree;
317 spin_lock_irqsave(&tree->lock, flags);
318 node = tree_search(tree, *file_offset);
324 entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
325 if (!offset_in_entry(entry, *file_offset)) {
330 dec_start = max(*file_offset, entry->file_offset);
331 dec_end = min(*file_offset + io_size, entry->file_offset +
333 *file_offset = dec_end;
334 if (dec_start > dec_end) {
335 btrfs_crit(fs_info, "bad ordering dec_start %llu end %llu",
338 to_dec = dec_end - dec_start;
339 if (to_dec > entry->bytes_left) {
341 "bad ordered accounting left %llu size %llu",
342 entry->bytes_left, to_dec);
344 entry->bytes_left -= to_dec;
346 set_bit(BTRFS_ORDERED_IOERR, &entry->flags);
348 if (entry->bytes_left == 0) {
349 ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
350 /* test_and_set_bit implies a barrier */
351 cond_wake_up_nomb(&entry->wait);
356 if (!ret && cached && entry) {
358 refcount_inc(&entry->refs);
360 spin_unlock_irqrestore(&tree->lock, flags);
365 * this is used to account for finished IO across a given range
366 * of the file. The IO should not span ordered extents. If
367 * a given ordered_extent is completely done, 1 is returned, otherwise
370 * test_and_set_bit on a flag in the struct btrfs_ordered_extent is used
371 * to make sure this function only returns 1 once for a given ordered extent.
373 int btrfs_dec_test_ordered_pending(struct inode *inode,
374 struct btrfs_ordered_extent **cached,
375 u64 file_offset, u64 io_size, int uptodate)
377 struct btrfs_ordered_inode_tree *tree;
378 struct rb_node *node;
379 struct btrfs_ordered_extent *entry = NULL;
383 tree = &BTRFS_I(inode)->ordered_tree;
384 spin_lock_irqsave(&tree->lock, flags);
385 if (cached && *cached) {
390 node = tree_search(tree, file_offset);
396 entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
398 if (!offset_in_entry(entry, file_offset)) {
403 if (io_size > entry->bytes_left) {
404 btrfs_crit(BTRFS_I(inode)->root->fs_info,
405 "bad ordered accounting left %llu size %llu",
406 entry->bytes_left, io_size);
408 entry->bytes_left -= io_size;
410 set_bit(BTRFS_ORDERED_IOERR, &entry->flags);
412 if (entry->bytes_left == 0) {
413 ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
414 /* test_and_set_bit implies a barrier */
415 cond_wake_up_nomb(&entry->wait);
420 if (!ret && cached && entry) {
422 refcount_inc(&entry->refs);
424 spin_unlock_irqrestore(&tree->lock, flags);
429 * used to drop a reference on an ordered extent. This will free
430 * the extent if the last reference is dropped
432 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
434 struct list_head *cur;
435 struct btrfs_ordered_sum *sum;
437 trace_btrfs_ordered_extent_put(entry->inode, entry);
439 if (refcount_dec_and_test(&entry->refs)) {
440 ASSERT(list_empty(&entry->log_list));
441 ASSERT(list_empty(&entry->trans_list));
442 ASSERT(list_empty(&entry->root_extent_list));
443 ASSERT(RB_EMPTY_NODE(&entry->rb_node));
445 btrfs_add_delayed_iput(entry->inode);
446 while (!list_empty(&entry->list)) {
447 cur = entry->list.next;
448 sum = list_entry(cur, struct btrfs_ordered_sum, list);
449 list_del(&sum->list);
452 kmem_cache_free(btrfs_ordered_extent_cache, entry);
457 * remove an ordered extent from the tree. No references are dropped
458 * and waiters are woken up.
460 void btrfs_remove_ordered_extent(struct inode *inode,
461 struct btrfs_ordered_extent *entry)
463 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
464 struct btrfs_ordered_inode_tree *tree;
465 struct btrfs_inode *btrfs_inode = BTRFS_I(inode);
466 struct btrfs_root *root = btrfs_inode->root;
467 struct rb_node *node;
469 /* This is paired with btrfs_add_ordered_extent. */
470 spin_lock(&btrfs_inode->lock);
471 btrfs_mod_outstanding_extents(btrfs_inode, -1);
472 spin_unlock(&btrfs_inode->lock);
473 if (root != fs_info->tree_root)
474 btrfs_delalloc_release_metadata(btrfs_inode, entry->len, false);
476 if (test_bit(BTRFS_ORDERED_DIRECT, &entry->flags))
477 percpu_counter_add_batch(&fs_info->dio_bytes, -entry->len,
478 fs_info->delalloc_batch);
480 tree = &btrfs_inode->ordered_tree;
481 spin_lock_irq(&tree->lock);
482 node = &entry->rb_node;
483 rb_erase(node, &tree->tree);
485 if (tree->last == node)
487 set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags);
488 spin_unlock_irq(&tree->lock);
490 spin_lock(&root->ordered_extent_lock);
491 list_del_init(&entry->root_extent_list);
492 root->nr_ordered_extents--;
494 trace_btrfs_ordered_extent_remove(inode, entry);
496 if (!root->nr_ordered_extents) {
497 spin_lock(&fs_info->ordered_root_lock);
498 BUG_ON(list_empty(&root->ordered_root));
499 list_del_init(&root->ordered_root);
500 spin_unlock(&fs_info->ordered_root_lock);
502 spin_unlock(&root->ordered_extent_lock);
503 wake_up(&entry->wait);
506 static void btrfs_run_ordered_extent_work(struct btrfs_work *work)
508 struct btrfs_ordered_extent *ordered;
510 ordered = container_of(work, struct btrfs_ordered_extent, flush_work);
511 btrfs_start_ordered_extent(ordered->inode, ordered, 1);
512 complete(&ordered->completion);
516 * wait for all the ordered extents in a root. This is done when balancing
517 * space between drives.
519 u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
520 const u64 range_start, const u64 range_len)
522 struct btrfs_fs_info *fs_info = root->fs_info;
526 struct btrfs_ordered_extent *ordered, *next;
528 const u64 range_end = range_start + range_len;
530 mutex_lock(&root->ordered_extent_mutex);
531 spin_lock(&root->ordered_extent_lock);
532 list_splice_init(&root->ordered_extents, &splice);
533 while (!list_empty(&splice) && nr) {
534 ordered = list_first_entry(&splice, struct btrfs_ordered_extent,
537 if (range_end <= ordered->start ||
538 ordered->start + ordered->disk_len <= range_start) {
539 list_move_tail(&ordered->root_extent_list, &skipped);
540 cond_resched_lock(&root->ordered_extent_lock);
544 list_move_tail(&ordered->root_extent_list,
545 &root->ordered_extents);
546 refcount_inc(&ordered->refs);
547 spin_unlock(&root->ordered_extent_lock);
549 btrfs_init_work(&ordered->flush_work,
550 btrfs_run_ordered_extent_work, NULL, NULL);
551 list_add_tail(&ordered->work_list, &works);
552 btrfs_queue_work(fs_info->flush_workers, &ordered->flush_work);
555 spin_lock(&root->ordered_extent_lock);
560 list_splice_tail(&skipped, &root->ordered_extents);
561 list_splice_tail(&splice, &root->ordered_extents);
562 spin_unlock(&root->ordered_extent_lock);
564 list_for_each_entry_safe(ordered, next, &works, work_list) {
565 list_del_init(&ordered->work_list);
566 wait_for_completion(&ordered->completion);
567 btrfs_put_ordered_extent(ordered);
570 mutex_unlock(&root->ordered_extent_mutex);
575 u64 btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
576 const u64 range_start, const u64 range_len)
578 struct btrfs_root *root;
579 struct list_head splice;
583 INIT_LIST_HEAD(&splice);
585 mutex_lock(&fs_info->ordered_operations_mutex);
586 spin_lock(&fs_info->ordered_root_lock);
587 list_splice_init(&fs_info->ordered_roots, &splice);
588 while (!list_empty(&splice) && nr) {
589 root = list_first_entry(&splice, struct btrfs_root,
591 root = btrfs_grab_fs_root(root);
593 list_move_tail(&root->ordered_root,
594 &fs_info->ordered_roots);
595 spin_unlock(&fs_info->ordered_root_lock);
597 done = btrfs_wait_ordered_extents(root, nr,
598 range_start, range_len);
599 btrfs_put_fs_root(root);
602 spin_lock(&fs_info->ordered_root_lock);
607 list_splice_tail(&splice, &fs_info->ordered_roots);
608 spin_unlock(&fs_info->ordered_root_lock);
609 mutex_unlock(&fs_info->ordered_operations_mutex);
615 * Used to start IO or wait for a given ordered extent to finish.
617 * If wait is one, this effectively waits on page writeback for all the pages
618 * in the extent, and it waits on the io completion code to insert
619 * metadata into the btree corresponding to the extent
621 void btrfs_start_ordered_extent(struct inode *inode,
622 struct btrfs_ordered_extent *entry,
625 u64 start = entry->file_offset;
626 u64 end = start + entry->len - 1;
628 trace_btrfs_ordered_extent_start(inode, entry);
631 * pages in the range can be dirty, clean or writeback. We
632 * start IO on any dirty ones so the wait doesn't stall waiting
633 * for the flusher thread to find them
635 if (!test_bit(BTRFS_ORDERED_DIRECT, &entry->flags))
636 filemap_fdatawrite_range(inode->i_mapping, start, end);
638 wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
644 * Used to wait on ordered extents across a large range of bytes.
646 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
652 struct btrfs_ordered_extent *ordered;
654 if (start + len < start) {
655 orig_end = INT_LIMIT(loff_t);
657 orig_end = start + len - 1;
658 if (orig_end > INT_LIMIT(loff_t))
659 orig_end = INT_LIMIT(loff_t);
662 /* start IO across the range first to instantiate any delalloc
665 ret = btrfs_fdatawrite_range(inode, start, orig_end);
670 * If we have a writeback error don't return immediately. Wait first
671 * for any ordered extents that haven't completed yet. This is to make
672 * sure no one can dirty the same page ranges and call writepages()
673 * before the ordered extents complete - to avoid failures (-EEXIST)
674 * when adding the new ordered extents to the ordered tree.
676 ret_wb = filemap_fdatawait_range(inode->i_mapping, start, orig_end);
680 ordered = btrfs_lookup_first_ordered_extent(inode, end);
683 if (ordered->file_offset > orig_end) {
684 btrfs_put_ordered_extent(ordered);
687 if (ordered->file_offset + ordered->len <= start) {
688 btrfs_put_ordered_extent(ordered);
691 btrfs_start_ordered_extent(inode, ordered, 1);
692 end = ordered->file_offset;
694 * If the ordered extent had an error save the error but don't
695 * exit without waiting first for all other ordered extents in
696 * the range to complete.
698 if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags))
700 btrfs_put_ordered_extent(ordered);
701 if (end == 0 || end == start)
705 return ret_wb ? ret_wb : ret;
709 * find an ordered extent corresponding to file_offset. return NULL if
710 * nothing is found, otherwise take a reference on the extent and return it
712 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
715 struct btrfs_ordered_inode_tree *tree;
716 struct rb_node *node;
717 struct btrfs_ordered_extent *entry = NULL;
719 tree = &BTRFS_I(inode)->ordered_tree;
720 spin_lock_irq(&tree->lock);
721 node = tree_search(tree, file_offset);
725 entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
726 if (!offset_in_entry(entry, file_offset))
729 refcount_inc(&entry->refs);
731 spin_unlock_irq(&tree->lock);
735 /* Since the DIO code tries to lock a wide area we need to look for any ordered
736 * extents that exist in the range, rather than just the start of the range.
738 struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
739 struct btrfs_inode *inode, u64 file_offset, u64 len)
741 struct btrfs_ordered_inode_tree *tree;
742 struct rb_node *node;
743 struct btrfs_ordered_extent *entry = NULL;
745 tree = &inode->ordered_tree;
746 spin_lock_irq(&tree->lock);
747 node = tree_search(tree, file_offset);
749 node = tree_search(tree, file_offset + len);
755 entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
756 if (range_overlaps(entry, file_offset, len))
759 if (entry->file_offset >= file_offset + len) {
764 node = rb_next(node);
770 refcount_inc(&entry->refs);
771 spin_unlock_irq(&tree->lock);
776 * lookup and return any extent before 'file_offset'. NULL is returned
779 struct btrfs_ordered_extent *
780 btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
782 struct btrfs_ordered_inode_tree *tree;
783 struct rb_node *node;
784 struct btrfs_ordered_extent *entry = NULL;
786 tree = &BTRFS_I(inode)->ordered_tree;
787 spin_lock_irq(&tree->lock);
788 node = tree_search(tree, file_offset);
792 entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
793 refcount_inc(&entry->refs);
795 spin_unlock_irq(&tree->lock);
800 * After an extent is done, call this to conditionally update the on disk
801 * i_size. i_size is updated to cover any fully written part of the file.
803 int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
804 struct btrfs_ordered_extent *ordered)
806 struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
809 u64 i_size = i_size_read(inode);
810 struct rb_node *node;
811 struct rb_node *prev = NULL;
812 struct btrfs_ordered_extent *test;
814 u64 orig_offset = offset;
816 spin_lock_irq(&tree->lock);
818 offset = entry_end(ordered);
819 if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags))
821 ordered->file_offset +
822 ordered->truncated_len);
824 offset = ALIGN(offset, btrfs_inode_sectorsize(inode));
826 disk_i_size = BTRFS_I(inode)->disk_i_size;
830 * If ordered is not NULL, then this is called from endio and
831 * disk_i_size will be updated by either truncate itself or any
832 * in-flight IOs which are inside the disk_i_size.
834 * Because btrfs_setsize() may set i_size with disk_i_size if truncate
835 * fails somehow, we need to make sure we have a precise disk_i_size by
836 * updating it as usual.
839 if (!ordered && disk_i_size > i_size) {
840 BTRFS_I(inode)->disk_i_size = orig_offset;
846 * if the disk i_size is already at the inode->i_size, or
847 * this ordered extent is inside the disk i_size, we're done
849 if (disk_i_size == i_size)
853 * We still need to update disk_i_size if outstanding_isize is greater
856 if (offset <= disk_i_size &&
857 (!ordered || ordered->outstanding_isize <= disk_i_size))
861 * walk backward from this ordered extent to disk_i_size.
862 * if we find an ordered extent then we can't update disk i_size
866 node = rb_prev(&ordered->rb_node);
868 prev = tree_search(tree, offset);
870 * we insert file extents without involving ordered struct,
871 * so there should be no ordered struct cover this offset
874 test = rb_entry(prev, struct btrfs_ordered_extent,
876 BUG_ON(offset_in_entry(test, offset));
880 for (; node; node = rb_prev(node)) {
881 test = rb_entry(node, struct btrfs_ordered_extent, rb_node);
883 /* We treat this entry as if it doesn't exist */
884 if (test_bit(BTRFS_ORDERED_UPDATED_ISIZE, &test->flags))
887 if (entry_end(test) <= disk_i_size)
889 if (test->file_offset >= i_size)
893 * We don't update disk_i_size now, so record this undealt
894 * i_size. Or we will not know the real i_size.
896 if (test->outstanding_isize < offset)
897 test->outstanding_isize = offset;
899 ordered->outstanding_isize > test->outstanding_isize)
900 test->outstanding_isize = ordered->outstanding_isize;
903 new_i_size = min_t(u64, offset, i_size);
906 * Some ordered extents may completed before the current one, and
907 * we hold the real i_size in ->outstanding_isize.
909 if (ordered && ordered->outstanding_isize > new_i_size)
910 new_i_size = min_t(u64, ordered->outstanding_isize, i_size);
911 BTRFS_I(inode)->disk_i_size = new_i_size;
915 * We need to do this because we can't remove ordered extents until
916 * after the i_disk_size has been updated and then the inode has been
917 * updated to reflect the change, so we need to tell anybody who finds
918 * this ordered extent that we've already done all the real work, we
919 * just haven't completed all the other work.
922 set_bit(BTRFS_ORDERED_UPDATED_ISIZE, &ordered->flags);
923 spin_unlock_irq(&tree->lock);
928 * search the ordered extents for one corresponding to 'offset' and
929 * try to find a checksum. This is used because we allow pages to
930 * be reclaimed before their checksum is actually put into the btree
932 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
935 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
936 struct btrfs_ordered_sum *ordered_sum;
937 struct btrfs_ordered_extent *ordered;
938 struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
939 unsigned long num_sectors;
941 u32 sectorsize = btrfs_inode_sectorsize(inode);
942 const u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
945 ordered = btrfs_lookup_ordered_extent(inode, offset);
949 spin_lock_irq(&tree->lock);
950 list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
951 if (disk_bytenr >= ordered_sum->bytenr &&
952 disk_bytenr < ordered_sum->bytenr + ordered_sum->len) {
953 i = (disk_bytenr - ordered_sum->bytenr) >>
954 inode->i_sb->s_blocksize_bits;
955 num_sectors = ordered_sum->len >>
956 inode->i_sb->s_blocksize_bits;
957 num_sectors = min_t(int, len - index, num_sectors - i);
958 memcpy(sum + index, ordered_sum->sums + i * csum_size,
959 num_sectors * csum_size);
961 index += (int)num_sectors * csum_size;
964 disk_bytenr += num_sectors * sectorsize;
968 spin_unlock_irq(&tree->lock);
969 btrfs_put_ordered_extent(ordered);
974 * btrfs_flush_ordered_range - Lock the passed range and ensures all pending
975 * ordered extents in it are run to completion.
977 * @tree: IO tree used for locking out other users of the range
978 * @inode: Inode whose ordered tree is to be searched
979 * @start: Beginning of range to flush
980 * @end: Last byte of range to lock
981 * @cached_state: If passed, will return the extent state responsible for the
982 * locked range. It's the caller's responsibility to free the cached state.
984 * This function always returns with the given range locked, ensuring after it's
985 * called no order extent can be pending.
987 void btrfs_lock_and_flush_ordered_range(struct extent_io_tree *tree,
988 struct btrfs_inode *inode, u64 start,
990 struct extent_state **cached_state)
992 struct btrfs_ordered_extent *ordered;
993 struct extent_state *cache = NULL;
994 struct extent_state **cachedp = &cache;
997 cachedp = cached_state;
1000 lock_extent_bits(tree, start, end, cachedp);
1001 ordered = btrfs_lookup_ordered_range(inode, start,
1005 * If no external cached_state has been passed then
1006 * decrement the extra ref taken for cachedp since we
1007 * aren't exposing it outside of this function
1010 refcount_dec(&cache->refs);
1013 unlock_extent_cached(tree, start, end, cachedp);
1014 btrfs_start_ordered_extent(&inode->vfs_inode, ordered, 1);
1015 btrfs_put_ordered_extent(ordered);
1019 int __init ordered_data_init(void)
1021 btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent",
1022 sizeof(struct btrfs_ordered_extent), 0,
1025 if (!btrfs_ordered_extent_cache)
1031 void __cold ordered_data_exit(void)
1033 kmem_cache_destroy(btrfs_ordered_extent_cache);