2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
20 #include <linux/blkdev.h>
21 #include <linux/scatterlist.h>
22 #include <linux/swap.h>
23 #include <linux/radix-tree.h>
24 #include <linux/writeback.h>
25 #include <linux/buffer_head.h> // for block_sync_page
26 #include <linux/workqueue.h>
30 #include "transaction.h"
31 #include "btrfs_inode.h"
33 #include "print-tree.h"
36 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
38 if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
39 printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
40 (unsigned long long)extent_buffer_blocknr(buf),
41 (unsigned long long)btrfs_header_blocknr(buf));
48 static struct extent_io_ops btree_extent_io_ops;
49 static struct workqueue_struct *end_io_workqueue;
50 static struct workqueue_struct *async_submit_workqueue;
56 struct btrfs_fs_info *info;
59 struct list_head list;
62 struct async_submit_bio {
65 struct list_head list;
66 extent_submit_bio_hook_t *submit_bio_hook;
71 struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
72 size_t page_offset, u64 start, u64 len,
75 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
76 struct extent_map *em;
79 spin_lock(&em_tree->lock);
80 em = lookup_extent_mapping(em_tree, start, len);
83 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
84 spin_unlock(&em_tree->lock);
87 spin_unlock(&em_tree->lock);
89 em = alloc_extent_map(GFP_NOFS);
91 em = ERR_PTR(-ENOMEM);
97 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
99 spin_lock(&em_tree->lock);
100 ret = add_extent_mapping(em_tree, em);
101 if (ret == -EEXIST) {
102 u64 failed_start = em->start;
103 u64 failed_len = em->len;
105 printk("failed to insert %Lu %Lu -> %Lu into tree\n",
106 em->start, em->len, em->block_start);
108 em = lookup_extent_mapping(em_tree, start, len);
110 printk("after failing, found %Lu %Lu %Lu\n",
111 em->start, em->len, em->block_start);
114 em = lookup_extent_mapping(em_tree, failed_start,
117 printk("double failure lookup gives us "
118 "%Lu %Lu -> %Lu\n", em->start,
119 em->len, em->block_start);
128 spin_unlock(&em_tree->lock);
136 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
138 return btrfs_crc32c(seed, data, len);
141 void btrfs_csum_final(u32 crc, char *result)
143 *(__le32 *)result = ~cpu_to_le32(crc);
146 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
149 char result[BTRFS_CRC32_SIZE];
151 unsigned long cur_len;
152 unsigned long offset = BTRFS_CSUM_SIZE;
153 char *map_token = NULL;
155 unsigned long map_start;
156 unsigned long map_len;
160 len = buf->len - offset;
162 err = map_private_extent_buffer(buf, offset, 32,
164 &map_start, &map_len, KM_USER0);
166 printk("failed to map extent buffer! %lu\n",
170 cur_len = min(len, map_len - (offset - map_start));
171 crc = btrfs_csum_data(root, kaddr + offset - map_start,
175 unmap_extent_buffer(buf, map_token, KM_USER0);
177 btrfs_csum_final(crc, result);
180 int from_this_trans = 0;
182 if (root->fs_info->running_transaction &&
183 btrfs_header_generation(buf) ==
184 root->fs_info->running_transaction->transid)
187 /* FIXME, this is not good */
188 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
191 memcpy(&found, result, BTRFS_CRC32_SIZE);
193 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
194 printk("btrfs: %s checksum verify failed on %llu "
195 "wanted %X found %X from_this_trans %d "
197 root->fs_info->sb->s_id,
198 buf->start, val, found, from_this_trans,
199 btrfs_header_level(buf));
203 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
208 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
209 struct extent_buffer *eb,
210 u64 start, u64 parent_transid)
212 struct extent_io_tree *io_tree;
217 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
219 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
220 btree_get_extent, mirror_num);
224 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
230 if (mirror_num > num_copies)
236 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
238 struct extent_io_tree *tree;
239 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
243 struct extent_buffer *eb;
246 tree = &BTRFS_I(page->mapping->host)->io_tree;
248 if (page->private == EXTENT_PAGE_PRIVATE)
252 len = page->private >> 2;
256 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
257 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
258 btrfs_header_generation(eb));
260 btrfs_clear_buffer_defrag(eb);
261 found_start = btrfs_header_bytenr(eb);
262 if (found_start != start) {
263 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
264 start, found_start, len);
268 if (eb->first_page != page) {
269 printk("bad first page %lu %lu\n", eb->first_page->index,
274 if (!PageUptodate(page)) {
275 printk("csum not up to date page %lu\n", page->index);
279 found_level = btrfs_header_level(eb);
280 spin_lock(&root->fs_info->hash_lock);
281 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
282 spin_unlock(&root->fs_info->hash_lock);
283 csum_tree_block(root, eb, 0);
285 free_extent_buffer(eb);
290 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
292 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
294 csum_dirty_buffer(root, page);
298 int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
299 struct extent_state *state)
301 struct extent_io_tree *tree;
305 struct extent_buffer *eb;
306 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
309 tree = &BTRFS_I(page->mapping->host)->io_tree;
310 if (page->private == EXTENT_PAGE_PRIVATE)
314 len = page->private >> 2;
318 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
320 btrfs_clear_buffer_defrag(eb);
321 found_start = btrfs_header_bytenr(eb);
322 if (found_start != start) {
326 if (eb->first_page != page) {
327 printk("bad first page %lu %lu\n", eb->first_page->index,
333 found_level = btrfs_header_level(eb);
335 ret = csum_tree_block(root, eb, 1);
339 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
340 end = eb->start + end - 1;
341 release_extent_buffer_tail_pages(eb);
343 free_extent_buffer(eb);
348 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
349 static void end_workqueue_bio(struct bio *bio, int err)
351 static int end_workqueue_bio(struct bio *bio,
352 unsigned int bytes_done, int err)
355 struct end_io_wq *end_io_wq = bio->bi_private;
356 struct btrfs_fs_info *fs_info;
359 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
364 fs_info = end_io_wq->info;
365 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
366 end_io_wq->error = err;
367 list_add_tail(&end_io_wq->list, &fs_info->end_io_work_list);
368 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
369 queue_work(end_io_workqueue, &fs_info->end_io_work);
371 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
376 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
379 struct end_io_wq *end_io_wq;
380 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
384 end_io_wq->private = bio->bi_private;
385 end_io_wq->end_io = bio->bi_end_io;
386 end_io_wq->info = info;
387 end_io_wq->error = 0;
388 end_io_wq->bio = bio;
389 end_io_wq->metadata = metadata;
391 bio->bi_private = end_io_wq;
392 bio->bi_end_io = end_workqueue_bio;
396 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
397 int rw, struct bio *bio, int mirror_num,
398 extent_submit_bio_hook_t *submit_bio_hook)
400 struct async_submit_bio *async;
403 * inline writerback should stay inline, only hop to the async
404 * queue if we're pdflush
406 if (!current_is_pdflush())
407 return submit_bio_hook(inode, rw, bio, mirror_num);
409 async = kmalloc(sizeof(*async), GFP_NOFS);
413 async->inode = inode;
416 async->mirror_num = mirror_num;
417 async->submit_bio_hook = submit_bio_hook;
419 spin_lock(&fs_info->async_submit_work_lock);
420 list_add_tail(&async->list, &fs_info->async_submit_work_list);
421 spin_unlock(&fs_info->async_submit_work_lock);
423 queue_work(async_submit_workqueue, &fs_info->async_submit_work);
427 static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
430 struct btrfs_root *root = BTRFS_I(inode)->root;
434 offset = bio->bi_sector << 9;
436 if (rw & (1 << BIO_RW)) {
437 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
440 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
443 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
446 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
449 if (!(rw & (1 << BIO_RW))) {
450 return __btree_submit_bio_hook(inode, rw, bio, mirror_num);
452 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
453 inode, rw, bio, mirror_num,
454 __btree_submit_bio_hook);
457 static int btree_writepage(struct page *page, struct writeback_control *wbc)
459 struct extent_io_tree *tree;
460 tree = &BTRFS_I(page->mapping->host)->io_tree;
461 return extent_write_full_page(tree, page, btree_get_extent, wbc);
464 static int btree_writepages(struct address_space *mapping,
465 struct writeback_control *wbc)
467 struct extent_io_tree *tree;
468 tree = &BTRFS_I(mapping->host)->io_tree;
469 if (wbc->sync_mode == WB_SYNC_NONE) {
472 unsigned long thresh = 96 * 1024 * 1024;
474 if (wbc->for_kupdate)
477 if (current_is_pdflush()) {
478 thresh = 96 * 1024 * 1024;
480 thresh = 8 * 1024 * 1024;
482 num_dirty = count_range_bits(tree, &start, (u64)-1,
483 thresh, EXTENT_DIRTY);
484 if (num_dirty < thresh) {
488 return extent_writepages(tree, mapping, btree_get_extent, wbc);
491 int btree_readpage(struct file *file, struct page *page)
493 struct extent_io_tree *tree;
494 tree = &BTRFS_I(page->mapping->host)->io_tree;
495 return extent_read_full_page(tree, page, btree_get_extent);
498 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
500 struct extent_io_tree *tree;
501 struct extent_map_tree *map;
504 if (page_count(page) > 3) {
505 /* once for page->private, once for the caller, once
506 * once for the page cache
510 tree = &BTRFS_I(page->mapping->host)->io_tree;
511 map = &BTRFS_I(page->mapping->host)->extent_tree;
512 ret = try_release_extent_state(map, tree, page, gfp_flags);
514 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
515 ClearPagePrivate(page);
516 set_page_private(page, 0);
517 page_cache_release(page);
522 static void btree_invalidatepage(struct page *page, unsigned long offset)
524 struct extent_io_tree *tree;
525 tree = &BTRFS_I(page->mapping->host)->io_tree;
526 extent_invalidatepage(tree, page, offset);
527 btree_releasepage(page, GFP_NOFS);
528 if (PagePrivate(page)) {
529 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
530 ClearPagePrivate(page);
531 set_page_private(page, 0);
532 page_cache_release(page);
537 static int btree_writepage(struct page *page, struct writeback_control *wbc)
539 struct buffer_head *bh;
540 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
541 struct buffer_head *head;
542 if (!page_has_buffers(page)) {
543 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
544 (1 << BH_Dirty)|(1 << BH_Uptodate));
546 head = page_buffers(page);
549 if (buffer_dirty(bh))
550 csum_tree_block(root, bh, 0);
551 bh = bh->b_this_page;
552 } while (bh != head);
553 return block_write_full_page(page, btree_get_block, wbc);
557 static struct address_space_operations btree_aops = {
558 .readpage = btree_readpage,
559 .writepage = btree_writepage,
560 .writepages = btree_writepages,
561 .releasepage = btree_releasepage,
562 .invalidatepage = btree_invalidatepage,
563 .sync_page = block_sync_page,
566 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
569 struct extent_buffer *buf = NULL;
570 struct inode *btree_inode = root->fs_info->btree_inode;
573 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
576 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
577 buf, 0, 0, btree_get_extent, 0);
578 free_extent_buffer(buf);
582 static int close_all_devices(struct btrfs_fs_info *fs_info)
584 struct list_head *list;
585 struct list_head *next;
586 struct btrfs_device *device;
588 list = &fs_info->fs_devices->devices;
589 list_for_each(next, list) {
590 device = list_entry(next, struct btrfs_device, dev_list);
591 close_bdev_excl(device->bdev);
597 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
598 u64 bytenr, u32 blocksize)
600 struct inode *btree_inode = root->fs_info->btree_inode;
601 struct extent_buffer *eb;
602 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
603 bytenr, blocksize, GFP_NOFS);
607 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
608 u64 bytenr, u32 blocksize)
610 struct inode *btree_inode = root->fs_info->btree_inode;
611 struct extent_buffer *eb;
613 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
614 bytenr, blocksize, NULL, GFP_NOFS);
619 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
620 u32 blocksize, u64 parent_transid)
622 struct extent_buffer *buf = NULL;
623 struct inode *btree_inode = root->fs_info->btree_inode;
624 struct extent_io_tree *io_tree;
627 io_tree = &BTRFS_I(btree_inode)->io_tree;
629 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
633 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
636 buf->flags |= EXTENT_UPTODATE;
642 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
643 struct extent_buffer *buf)
645 struct inode *btree_inode = root->fs_info->btree_inode;
646 if (btrfs_header_generation(buf) ==
647 root->fs_info->running_transaction->transid)
648 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
653 int wait_on_tree_block_writeback(struct btrfs_root *root,
654 struct extent_buffer *buf)
656 struct inode *btree_inode = root->fs_info->btree_inode;
657 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
662 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
663 u32 stripesize, struct btrfs_root *root,
664 struct btrfs_fs_info *fs_info,
669 root->commit_root = NULL;
670 root->sectorsize = sectorsize;
671 root->nodesize = nodesize;
672 root->leafsize = leafsize;
673 root->stripesize = stripesize;
675 root->track_dirty = 0;
677 root->fs_info = fs_info;
678 root->objectid = objectid;
679 root->last_trans = 0;
680 root->highest_inode = 0;
681 root->last_inode_alloc = 0;
685 INIT_LIST_HEAD(&root->dirty_list);
686 memset(&root->root_key, 0, sizeof(root->root_key));
687 memset(&root->root_item, 0, sizeof(root->root_item));
688 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
689 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
690 init_completion(&root->kobj_unregister);
691 root->defrag_running = 0;
692 root->defrag_level = 0;
693 root->root_key.objectid = objectid;
697 static int find_and_setup_root(struct btrfs_root *tree_root,
698 struct btrfs_fs_info *fs_info,
700 struct btrfs_root *root)
705 __setup_root(tree_root->nodesize, tree_root->leafsize,
706 tree_root->sectorsize, tree_root->stripesize,
707 root, fs_info, objectid);
708 ret = btrfs_find_last_root(tree_root, objectid,
709 &root->root_item, &root->root_key);
712 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
713 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
719 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
720 struct btrfs_key *location)
722 struct btrfs_root *root;
723 struct btrfs_root *tree_root = fs_info->tree_root;
724 struct btrfs_path *path;
725 struct extent_buffer *l;
730 root = kzalloc(sizeof(*root), GFP_NOFS);
732 return ERR_PTR(-ENOMEM);
733 if (location->offset == (u64)-1) {
734 ret = find_and_setup_root(tree_root, fs_info,
735 location->objectid, root);
743 __setup_root(tree_root->nodesize, tree_root->leafsize,
744 tree_root->sectorsize, tree_root->stripesize,
745 root, fs_info, location->objectid);
747 path = btrfs_alloc_path();
749 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
756 read_extent_buffer(l, &root->root_item,
757 btrfs_item_ptr_offset(l, path->slots[0]),
758 sizeof(root->root_item));
759 memcpy(&root->root_key, location, sizeof(*location));
762 btrfs_release_path(root, path);
763 btrfs_free_path(path);
768 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
769 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
774 ret = btrfs_find_highest_inode(root, &highest_inode);
776 root->highest_inode = highest_inode;
777 root->last_inode_alloc = highest_inode;
782 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
785 struct btrfs_root *root;
787 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
788 return fs_info->tree_root;
789 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
790 return fs_info->extent_root;
792 root = radix_tree_lookup(&fs_info->fs_roots_radix,
793 (unsigned long)root_objectid);
797 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
798 struct btrfs_key *location)
800 struct btrfs_root *root;
803 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
804 return fs_info->tree_root;
805 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
806 return fs_info->extent_root;
807 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
808 return fs_info->chunk_root;
809 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
810 return fs_info->dev_root;
812 root = radix_tree_lookup(&fs_info->fs_roots_radix,
813 (unsigned long)location->objectid);
817 root = btrfs_read_fs_root_no_radix(fs_info, location);
820 ret = radix_tree_insert(&fs_info->fs_roots_radix,
821 (unsigned long)root->root_key.objectid,
824 free_extent_buffer(root->node);
828 ret = btrfs_find_dead_roots(fs_info->tree_root,
829 root->root_key.objectid, root);
835 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
836 struct btrfs_key *location,
837 const char *name, int namelen)
839 struct btrfs_root *root;
842 root = btrfs_read_fs_root_no_name(fs_info, location);
849 ret = btrfs_set_root_name(root, name, namelen);
851 free_extent_buffer(root->node);
856 ret = btrfs_sysfs_add_root(root);
858 free_extent_buffer(root->node);
867 static int add_hasher(struct btrfs_fs_info *info, char *type) {
868 struct btrfs_hasher *hasher;
870 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
873 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
874 if (!hasher->hash_tfm) {
878 spin_lock(&info->hash_lock);
879 list_add(&hasher->list, &info->hashers);
880 spin_unlock(&info->hash_lock);
885 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
887 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
889 struct list_head *cur;
890 struct btrfs_device *device;
891 struct backing_dev_info *bdi;
893 list_for_each(cur, &info->fs_devices->devices) {
894 device = list_entry(cur, struct btrfs_device, dev_list);
895 bdi = blk_get_backing_dev_info(device->bdev);
896 if (bdi && bdi_congested(bdi, bdi_bits)) {
905 * this unplugs every device on the box, and it is only used when page
908 static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
910 struct list_head *cur;
911 struct btrfs_device *device;
912 struct btrfs_fs_info *info;
914 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
915 list_for_each(cur, &info->fs_devices->devices) {
916 device = list_entry(cur, struct btrfs_device, dev_list);
917 bdi = blk_get_backing_dev_info(device->bdev);
918 if (bdi->unplug_io_fn) {
919 bdi->unplug_io_fn(bdi, page);
924 void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
927 struct extent_map_tree *em_tree;
928 struct extent_map *em;
929 struct address_space *mapping;
932 /* the generic O_DIRECT read code does this */
934 __unplug_io_fn(bdi, page);
939 * page->mapping may change at any time. Get a consistent copy
940 * and use that for everything below
943 mapping = page->mapping;
947 inode = mapping->host;
948 offset = page_offset(page);
950 em_tree = &BTRFS_I(inode)->extent_tree;
951 spin_lock(&em_tree->lock);
952 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
953 spin_unlock(&em_tree->lock);
957 offset = offset - em->start;
958 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
959 em->block_start + offset, page);
963 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
965 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
968 bdi->ra_pages = default_backing_dev_info.ra_pages;
970 bdi->capabilities = default_backing_dev_info.capabilities;
971 bdi->unplug_io_fn = btrfs_unplug_io_fn;
972 bdi->unplug_io_data = info;
973 bdi->congested_fn = btrfs_congested_fn;
974 bdi->congested_data = info;
978 static int bio_ready_for_csum(struct bio *bio)
984 struct extent_io_tree *io_tree = NULL;
985 struct btrfs_fs_info *info = NULL;
986 struct bio_vec *bvec;
990 bio_for_each_segment(bvec, bio, i) {
991 page = bvec->bv_page;
992 if (page->private == EXTENT_PAGE_PRIVATE) {
993 length += bvec->bv_len;
996 if (!page->private) {
997 length += bvec->bv_len;
1000 length = bvec->bv_len;
1001 buf_len = page->private >> 2;
1002 start = page_offset(page) + bvec->bv_offset;
1003 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1004 info = BTRFS_I(page->mapping->host)->root->fs_info;
1006 /* are we fully contained in this bio? */
1007 if (buf_len <= length)
1010 ret = extent_range_uptodate(io_tree, start + length,
1011 start + buf_len - 1);
1017 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1018 static void btrfs_end_io_csum(void *p)
1020 static void btrfs_end_io_csum(struct work_struct *work)
1023 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1024 struct btrfs_fs_info *fs_info = p;
1026 struct btrfs_fs_info *fs_info = container_of(work,
1027 struct btrfs_fs_info,
1030 unsigned long flags;
1031 struct end_io_wq *end_io_wq;
1033 struct list_head *next;
1038 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
1039 if (list_empty(&fs_info->end_io_work_list)) {
1040 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1044 next = fs_info->end_io_work_list.next;
1046 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
1048 end_io_wq = list_entry(next, struct end_io_wq, list);
1050 bio = end_io_wq->bio;
1051 if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
1052 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
1053 was_empty = list_empty(&fs_info->end_io_work_list);
1054 list_add_tail(&end_io_wq->list,
1055 &fs_info->end_io_work_list);
1056 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1062 error = end_io_wq->error;
1063 bio->bi_private = end_io_wq->private;
1064 bio->bi_end_io = end_io_wq->end_io;
1066 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
1067 bio_endio(bio, bio->bi_size, error);
1069 bio_endio(bio, error);
1074 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1075 static void btrfs_async_submit_work(void *p)
1077 static void btrfs_async_submit_work(struct work_struct *work)
1080 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1081 struct btrfs_fs_info *fs_info = p;
1083 struct btrfs_fs_info *fs_info = container_of(work,
1084 struct btrfs_fs_info,
1087 struct async_submit_bio *async;
1088 struct list_head *next;
1091 spin_lock(&fs_info->async_submit_work_lock);
1092 if (list_empty(&fs_info->async_submit_work_list)) {
1093 spin_unlock(&fs_info->async_submit_work_lock);
1096 next = fs_info->async_submit_work_list.next;
1098 spin_unlock(&fs_info->async_submit_work_lock);
1100 async = list_entry(next, struct async_submit_bio, list);
1101 async->submit_bio_hook(async->inode, async->rw, async->bio,
1107 struct btrfs_root *open_ctree(struct super_block *sb,
1108 struct btrfs_fs_devices *fs_devices)
1115 struct buffer_head *bh;
1116 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
1118 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
1120 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
1122 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
1124 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
1128 struct btrfs_super_block *disk_super;
1130 if (!extent_root || !tree_root || !fs_info) {
1134 end_io_workqueue = create_workqueue("btrfs-end-io");
1135 BUG_ON(!end_io_workqueue);
1136 async_submit_workqueue = create_workqueue("btrfs-async-submit");
1138 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
1139 INIT_LIST_HEAD(&fs_info->trans_list);
1140 INIT_LIST_HEAD(&fs_info->dead_roots);
1141 INIT_LIST_HEAD(&fs_info->hashers);
1142 INIT_LIST_HEAD(&fs_info->end_io_work_list);
1143 INIT_LIST_HEAD(&fs_info->async_submit_work_list);
1144 spin_lock_init(&fs_info->hash_lock);
1145 spin_lock_init(&fs_info->end_io_work_lock);
1146 spin_lock_init(&fs_info->async_submit_work_lock);
1147 spin_lock_init(&fs_info->delalloc_lock);
1148 spin_lock_init(&fs_info->new_trans_lock);
1150 init_completion(&fs_info->kobj_unregister);
1151 fs_info->tree_root = tree_root;
1152 fs_info->extent_root = extent_root;
1153 fs_info->chunk_root = chunk_root;
1154 fs_info->dev_root = dev_root;
1155 fs_info->fs_devices = fs_devices;
1156 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
1157 INIT_LIST_HEAD(&fs_info->space_info);
1158 btrfs_mapping_init(&fs_info->mapping_tree);
1160 fs_info->max_extent = (u64)-1;
1161 fs_info->max_inline = 8192 * 1024;
1162 setup_bdi(fs_info, &fs_info->bdi);
1163 fs_info->btree_inode = new_inode(sb);
1164 fs_info->btree_inode->i_ino = 1;
1165 fs_info->btree_inode->i_nlink = 1;
1167 sb->s_blocksize = 4096;
1168 sb->s_blocksize_bits = blksize_bits(4096);
1171 * we set the i_size on the btree inode to the max possible int.
1172 * the real end of the address space is determined by all of
1173 * the devices in the system
1175 fs_info->btree_inode->i_size = OFFSET_MAX;
1176 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
1177 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1179 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
1180 fs_info->btree_inode->i_mapping,
1182 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1185 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1187 extent_io_tree_init(&fs_info->free_space_cache,
1188 fs_info->btree_inode->i_mapping, GFP_NOFS);
1189 extent_io_tree_init(&fs_info->block_group_cache,
1190 fs_info->btree_inode->i_mapping, GFP_NOFS);
1191 extent_io_tree_init(&fs_info->pinned_extents,
1192 fs_info->btree_inode->i_mapping, GFP_NOFS);
1193 extent_io_tree_init(&fs_info->pending_del,
1194 fs_info->btree_inode->i_mapping, GFP_NOFS);
1195 extent_io_tree_init(&fs_info->extent_ins,
1196 fs_info->btree_inode->i_mapping, GFP_NOFS);
1197 fs_info->do_barriers = 1;
1199 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1200 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum, fs_info);
1201 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work,
1203 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
1205 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum);
1206 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work);
1207 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
1209 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1210 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1211 sizeof(struct btrfs_key));
1212 insert_inode_hash(fs_info->btree_inode);
1213 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
1215 mutex_init(&fs_info->trans_mutex);
1216 mutex_init(&fs_info->fs_mutex);
1219 ret = add_hasher(fs_info, "crc32c");
1221 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
1226 __setup_root(4096, 4096, 4096, 4096, tree_root,
1227 fs_info, BTRFS_ROOT_TREE_OBJECTID);
1230 bh = __bread(fs_devices->latest_bdev,
1231 BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
1235 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
1238 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
1240 disk_super = &fs_info->super_copy;
1241 if (!btrfs_super_root(disk_super))
1242 goto fail_sb_buffer;
1244 if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
1245 printk("Btrfs: wanted %llu devices, but found %llu\n",
1246 (unsigned long long)btrfs_super_num_devices(disk_super),
1247 (unsigned long long)fs_devices->num_devices);
1248 goto fail_sb_buffer;
1250 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
1252 nodesize = btrfs_super_nodesize(disk_super);
1253 leafsize = btrfs_super_leafsize(disk_super);
1254 sectorsize = btrfs_super_sectorsize(disk_super);
1255 stripesize = btrfs_super_stripesize(disk_super);
1256 tree_root->nodesize = nodesize;
1257 tree_root->leafsize = leafsize;
1258 tree_root->sectorsize = sectorsize;
1259 tree_root->stripesize = stripesize;
1261 sb->s_blocksize = sectorsize;
1262 sb->s_blocksize_bits = blksize_bits(sectorsize);
1264 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1265 sizeof(disk_super->magic))) {
1266 printk("btrfs: valid FS not found on %s\n", sb->s_id);
1267 goto fail_sb_buffer;
1270 mutex_lock(&fs_info->fs_mutex);
1272 ret = btrfs_read_sys_array(tree_root);
1274 printk("btrfs: failed to read the system array on %s\n",
1276 goto fail_sys_array;
1279 blocksize = btrfs_level_size(tree_root,
1280 btrfs_super_chunk_root_level(disk_super));
1282 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1283 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1285 chunk_root->node = read_tree_block(chunk_root,
1286 btrfs_super_chunk_root(disk_super),
1288 BUG_ON(!chunk_root->node);
1290 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
1291 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1294 ret = btrfs_read_chunk_tree(chunk_root);
1297 blocksize = btrfs_level_size(tree_root,
1298 btrfs_super_root_level(disk_super));
1301 tree_root->node = read_tree_block(tree_root,
1302 btrfs_super_root(disk_super),
1304 if (!tree_root->node)
1305 goto fail_sb_buffer;
1308 ret = find_and_setup_root(tree_root, fs_info,
1309 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
1311 goto fail_tree_root;
1312 extent_root->track_dirty = 1;
1314 ret = find_and_setup_root(tree_root, fs_info,
1315 BTRFS_DEV_TREE_OBJECTID, dev_root);
1316 dev_root->track_dirty = 1;
1319 goto fail_extent_root;
1321 btrfs_read_block_groups(extent_root);
1323 fs_info->generation = btrfs_super_generation(disk_super) + 1;
1324 fs_info->data_alloc_profile = (u64)-1;
1325 fs_info->metadata_alloc_profile = (u64)-1;
1326 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1328 mutex_unlock(&fs_info->fs_mutex);
1332 free_extent_buffer(extent_root->node);
1334 free_extent_buffer(tree_root->node);
1336 mutex_unlock(&fs_info->fs_mutex);
1338 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1340 iput(fs_info->btree_inode);
1342 close_all_devices(fs_info);
1343 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1347 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1348 bdi_destroy(&fs_info->bdi);
1351 return ERR_PTR(err);
1354 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
1356 char b[BDEVNAME_SIZE];
1359 set_buffer_uptodate(bh);
1361 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
1362 printk(KERN_WARNING "lost page write due to "
1363 "I/O error on %s\n",
1364 bdevname(bh->b_bdev, b));
1366 set_buffer_write_io_error(bh);
1367 clear_buffer_uptodate(bh);
1373 int write_all_supers(struct btrfs_root *root)
1375 struct list_head *cur;
1376 struct list_head *head = &root->fs_info->fs_devices->devices;
1377 struct btrfs_device *dev;
1378 struct btrfs_super_block *sb;
1379 struct btrfs_dev_item *dev_item;
1380 struct buffer_head *bh;
1384 int total_errors = 0;
1388 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
1389 do_barriers = !btrfs_test_opt(root, NOBARRIER);
1391 sb = &root->fs_info->super_for_commit;
1392 dev_item = &sb->dev_item;
1393 list_for_each(cur, head) {
1394 dev = list_entry(cur, struct btrfs_device, dev_list);
1395 btrfs_set_stack_device_type(dev_item, dev->type);
1396 btrfs_set_stack_device_id(dev_item, dev->devid);
1397 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1398 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1399 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1400 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1401 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1402 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1403 flags = btrfs_super_flags(sb);
1404 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1408 crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc,
1409 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1410 btrfs_csum_final(crc, sb->csum);
1412 bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096,
1413 BTRFS_SUPER_INFO_SIZE);
1415 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
1416 dev->pending_io = bh;
1419 set_buffer_uptodate(bh);
1421 bh->b_end_io = btrfs_end_buffer_write_sync;
1423 if (do_barriers && dev->barriers) {
1424 ret = submit_bh(WRITE_BARRIER, bh);
1425 if (ret == -EOPNOTSUPP) {
1426 printk("btrfs: disabling barriers on dev %s\n",
1428 set_buffer_uptodate(bh);
1432 ret = submit_bh(WRITE, bh);
1435 ret = submit_bh(WRITE, bh);
1440 if (total_errors > max_errors) {
1441 printk("btrfs: %d errors while writing supers\n", total_errors);
1446 list_for_each(cur, head) {
1447 dev = list_entry(cur, struct btrfs_device, dev_list);
1448 BUG_ON(!dev->pending_io);
1449 bh = dev->pending_io;
1451 if (!buffer_uptodate(dev->pending_io)) {
1452 if (do_barriers && dev->barriers) {
1453 printk("btrfs: disabling barriers on dev %s\n",
1455 set_buffer_uptodate(bh);
1459 ret = submit_bh(WRITE, bh);
1462 BUG_ON(!buffer_uptodate(bh));
1468 dev->pending_io = NULL;
1471 if (total_errors > max_errors) {
1472 printk("btrfs: %d errors while writing supers\n", total_errors);
1478 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
1483 ret = write_all_supers(root);
1487 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
1489 radix_tree_delete(&fs_info->fs_roots_radix,
1490 (unsigned long)root->root_key.objectid);
1492 btrfs_sysfs_del_root(root);
1496 free_extent_buffer(root->node);
1497 if (root->commit_root)
1498 free_extent_buffer(root->commit_root);
1505 static int del_fs_roots(struct btrfs_fs_info *fs_info)
1508 struct btrfs_root *gang[8];
1512 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
1517 for (i = 0; i < ret; i++)
1518 btrfs_free_fs_root(fs_info, gang[i]);
1523 int close_ctree(struct btrfs_root *root)
1526 struct btrfs_trans_handle *trans;
1527 struct btrfs_fs_info *fs_info = root->fs_info;
1529 fs_info->closing = 1;
1530 btrfs_transaction_flush_work(root);
1531 mutex_lock(&fs_info->fs_mutex);
1532 btrfs_defrag_dirty_roots(root->fs_info);
1533 trans = btrfs_start_transaction(root, 1);
1534 ret = btrfs_commit_transaction(trans, root);
1535 /* run commit again to drop the original snapshot */
1536 trans = btrfs_start_transaction(root, 1);
1537 btrfs_commit_transaction(trans, root);
1538 ret = btrfs_write_and_wait_transaction(NULL, root);
1541 write_ctree_super(NULL, root);
1542 mutex_unlock(&fs_info->fs_mutex);
1544 btrfs_transaction_flush_work(root);
1546 if (fs_info->delalloc_bytes) {
1547 printk("btrfs: at unmount delalloc count %Lu\n",
1548 fs_info->delalloc_bytes);
1550 if (fs_info->extent_root->node)
1551 free_extent_buffer(fs_info->extent_root->node);
1553 if (fs_info->tree_root->node)
1554 free_extent_buffer(fs_info->tree_root->node);
1556 if (root->fs_info->chunk_root->node);
1557 free_extent_buffer(root->fs_info->chunk_root->node);
1559 if (root->fs_info->dev_root->node);
1560 free_extent_buffer(root->fs_info->dev_root->node);
1562 btrfs_free_block_groups(root->fs_info);
1563 del_fs_roots(fs_info);
1565 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1567 extent_io_tree_empty_lru(&fs_info->free_space_cache);
1568 extent_io_tree_empty_lru(&fs_info->block_group_cache);
1569 extent_io_tree_empty_lru(&fs_info->pinned_extents);
1570 extent_io_tree_empty_lru(&fs_info->pending_del);
1571 extent_io_tree_empty_lru(&fs_info->extent_ins);
1572 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1574 flush_workqueue(async_submit_workqueue);
1575 flush_workqueue(end_io_workqueue);
1577 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
1579 flush_workqueue(async_submit_workqueue);
1580 destroy_workqueue(async_submit_workqueue);
1582 flush_workqueue(end_io_workqueue);
1583 destroy_workqueue(end_io_workqueue);
1585 iput(fs_info->btree_inode);
1587 while(!list_empty(&fs_info->hashers)) {
1588 struct btrfs_hasher *hasher;
1589 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
1591 list_del(&hasher->hashers);
1592 crypto_free_hash(&fs_info->hash_tfm);
1596 close_all_devices(fs_info);
1597 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1599 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1600 bdi_destroy(&fs_info->bdi);
1603 kfree(fs_info->extent_root);
1604 kfree(fs_info->tree_root);
1605 kfree(fs_info->chunk_root);
1606 kfree(fs_info->dev_root);
1610 int btrfs_buffer_uptodate(struct extent_buffer *buf)
1612 struct inode *btree_inode = buf->first_page->mapping->host;
1613 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
1616 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1618 struct inode *btree_inode = buf->first_page->mapping->host;
1619 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1623 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1625 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1626 u64 transid = btrfs_header_generation(buf);
1627 struct inode *btree_inode = root->fs_info->btree_inode;
1629 if (transid != root->fs_info->generation) {
1630 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1631 (unsigned long long)buf->start,
1632 transid, root->fs_info->generation);
1635 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1638 void btrfs_throttle(struct btrfs_root *root)
1640 struct backing_dev_info *bdi;
1642 bdi = &root->fs_info->bdi;
1643 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
1644 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
1645 congestion_wait(WRITE, HZ/20);
1647 blk_congestion_wait(WRITE, HZ/20);
1652 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1655 * looks as though older kernels can get into trouble with
1656 * this code, they end up stuck in balance_dirty_pages forever
1658 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1659 struct extent_io_tree *tree;
1662 unsigned long thresh = 16 * 1024 * 1024;
1663 tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
1665 if (current_is_pdflush())
1668 num_dirty = count_range_bits(tree, &start, (u64)-1,
1669 thresh, EXTENT_DIRTY);
1670 if (num_dirty > thresh) {
1671 balance_dirty_pages_ratelimited_nr(
1672 root->fs_info->btree_inode->i_mapping, 1);
1679 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
1681 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1682 struct inode *btree_inode = root->fs_info->btree_inode;
1683 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1684 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
1687 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
1689 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1690 struct inode *btree_inode = root->fs_info->btree_inode;
1691 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1692 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
1696 int btrfs_buffer_defrag(struct extent_buffer *buf)
1698 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1699 struct inode *btree_inode = root->fs_info->btree_inode;
1700 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1701 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
1704 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
1706 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1707 struct inode *btree_inode = root->fs_info->btree_inode;
1708 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1709 buf->start, buf->start + buf->len - 1,
1710 EXTENT_DEFRAG_DONE, 0);
1713 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
1715 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1716 struct inode *btree_inode = root->fs_info->btree_inode;
1717 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1718 buf->start, buf->start + buf->len - 1,
1719 EXTENT_DEFRAG_DONE, GFP_NOFS);
1722 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
1724 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1725 struct inode *btree_inode = root->fs_info->btree_inode;
1726 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1727 buf->start, buf->start + buf->len - 1,
1728 EXTENT_DEFRAG, GFP_NOFS);
1731 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
1733 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1735 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
1737 buf->flags |= EXTENT_UPTODATE;
1742 static struct extent_io_ops btree_extent_io_ops = {
1743 .writepage_io_hook = btree_writepage_io_hook,
1744 .readpage_end_io_hook = btree_readpage_end_io_hook,
1745 .submit_bio_hook = btree_submit_bio_hook,
1746 /* note we're sharing with inode.c for the merge bio hook */
1747 .merge_bio_hook = btrfs_merge_bio_hook,