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);
81 spin_unlock(&em_tree->lock);
85 em = alloc_extent_map(GFP_NOFS);
87 em = ERR_PTR(-ENOMEM);
93 em->bdev = inode->i_sb->s_bdev;
95 spin_lock(&em_tree->lock);
96 ret = add_extent_mapping(em_tree, em);
98 u64 failed_start = em->start;
99 u64 failed_len = em->len;
101 printk("failed to insert %Lu %Lu -> %Lu into tree\n",
102 em->start, em->len, em->block_start);
104 em = lookup_extent_mapping(em_tree, start, len);
106 printk("after failing, found %Lu %Lu %Lu\n",
107 em->start, em->len, em->block_start);
110 em = lookup_extent_mapping(em_tree, failed_start,
113 printk("double failure lookup gives us "
114 "%Lu %Lu -> %Lu\n", em->start,
115 em->len, em->block_start);
124 spin_unlock(&em_tree->lock);
132 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
134 return btrfs_crc32c(seed, data, len);
137 void btrfs_csum_final(u32 crc, char *result)
139 *(__le32 *)result = ~cpu_to_le32(crc);
142 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
145 char result[BTRFS_CRC32_SIZE];
147 unsigned long cur_len;
148 unsigned long offset = BTRFS_CSUM_SIZE;
149 char *map_token = NULL;
151 unsigned long map_start;
152 unsigned long map_len;
156 len = buf->len - offset;
158 err = map_private_extent_buffer(buf, offset, 32,
160 &map_start, &map_len, KM_USER0);
162 printk("failed to map extent buffer! %lu\n",
166 cur_len = min(len, map_len - (offset - map_start));
167 crc = btrfs_csum_data(root, kaddr + offset - map_start,
171 unmap_extent_buffer(buf, map_token, KM_USER0);
173 btrfs_csum_final(crc, result);
176 int from_this_trans = 0;
178 if (root->fs_info->running_transaction &&
179 btrfs_header_generation(buf) ==
180 root->fs_info->running_transaction->transid)
183 /* FIXME, this is not good */
184 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
187 memcpy(&found, result, BTRFS_CRC32_SIZE);
189 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
190 printk("btrfs: %s checksum verify failed on %llu "
191 "wanted %X found %X from_this_trans %d "
193 root->fs_info->sb->s_id,
194 buf->start, val, found, from_this_trans,
195 btrfs_header_level(buf));
199 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
204 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
205 struct extent_buffer *eb,
208 struct extent_io_tree *io_tree;
213 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
215 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
216 btree_get_extent, mirror_num);
220 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
226 if (mirror_num > num_copies)
232 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
234 struct extent_io_tree *tree;
235 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
239 struct extent_buffer *eb;
242 tree = &BTRFS_I(page->mapping->host)->io_tree;
244 if (page->private == EXTENT_PAGE_PRIVATE)
248 len = page->private >> 2;
252 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
253 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE);
255 btrfs_clear_buffer_defrag(eb);
256 found_start = btrfs_header_bytenr(eb);
257 if (found_start != start) {
258 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
259 start, found_start, len);
263 if (eb->first_page != page) {
264 printk("bad first page %lu %lu\n", eb->first_page->index,
269 if (!PageUptodate(page)) {
270 printk("csum not up to date page %lu\n", page->index);
274 found_level = btrfs_header_level(eb);
275 spin_lock(&root->fs_info->hash_lock);
276 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
277 spin_unlock(&root->fs_info->hash_lock);
278 csum_tree_block(root, eb, 0);
280 free_extent_buffer(eb);
285 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
287 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
289 csum_dirty_buffer(root, page);
293 int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
294 struct extent_state *state)
296 struct extent_io_tree *tree;
300 struct extent_buffer *eb;
301 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
304 tree = &BTRFS_I(page->mapping->host)->io_tree;
305 if (page->private == EXTENT_PAGE_PRIVATE)
309 len = page->private >> 2;
313 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
315 btrfs_clear_buffer_defrag(eb);
316 found_start = btrfs_header_bytenr(eb);
317 if (found_start != start) {
321 if (eb->first_page != page) {
322 printk("bad first page %lu %lu\n", eb->first_page->index,
328 found_level = btrfs_header_level(eb);
330 ret = csum_tree_block(root, eb, 1);
334 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
335 end = eb->start + end - 1;
336 release_extent_buffer_tail_pages(eb);
338 free_extent_buffer(eb);
343 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
344 static void end_workqueue_bio(struct bio *bio, int err)
346 static int end_workqueue_bio(struct bio *bio,
347 unsigned int bytes_done, int err)
350 struct end_io_wq *end_io_wq = bio->bi_private;
351 struct btrfs_fs_info *fs_info;
354 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
359 fs_info = end_io_wq->info;
360 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
361 end_io_wq->error = err;
362 list_add_tail(&end_io_wq->list, &fs_info->end_io_work_list);
363 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
364 queue_work(end_io_workqueue, &fs_info->end_io_work);
366 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
371 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
374 struct end_io_wq *end_io_wq;
375 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
379 end_io_wq->private = bio->bi_private;
380 end_io_wq->end_io = bio->bi_end_io;
381 end_io_wq->info = info;
382 end_io_wq->error = 0;
383 end_io_wq->bio = bio;
384 end_io_wq->metadata = metadata;
386 bio->bi_private = end_io_wq;
387 bio->bi_end_io = end_workqueue_bio;
391 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
392 int rw, struct bio *bio, int mirror_num,
393 extent_submit_bio_hook_t *submit_bio_hook)
395 struct async_submit_bio *async;
398 * inline writerback should stay inline, only hop to the async
399 * queue if we're pdflush
401 if (!current_is_pdflush())
402 return submit_bio_hook(inode, rw, bio, mirror_num);
404 async = kmalloc(sizeof(*async), GFP_NOFS);
408 async->inode = inode;
411 async->mirror_num = mirror_num;
412 async->submit_bio_hook = submit_bio_hook;
414 spin_lock(&fs_info->async_submit_work_lock);
415 list_add_tail(&async->list, &fs_info->async_submit_work_list);
416 spin_unlock(&fs_info->async_submit_work_lock);
418 queue_work(async_submit_workqueue, &fs_info->async_submit_work);
422 static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
425 struct btrfs_root *root = BTRFS_I(inode)->root;
429 offset = bio->bi_sector << 9;
431 if (rw & (1 << BIO_RW)) {
432 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
435 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
438 if (offset == BTRFS_SUPER_INFO_OFFSET) {
439 bio->bi_bdev = root->fs_info->fs_devices->latest_bdev;
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)
568 struct extent_buffer *buf = NULL;
569 struct inode *btree_inode = root->fs_info->btree_inode;
572 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
575 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
576 buf, 0, 0, btree_get_extent, 0);
577 free_extent_buffer(buf);
581 static int close_all_devices(struct btrfs_fs_info *fs_info)
583 struct list_head *list;
584 struct list_head *next;
585 struct btrfs_device *device;
587 list = &fs_info->fs_devices->devices;
588 list_for_each(next, list) {
589 device = list_entry(next, struct btrfs_device, dev_list);
590 if (device->bdev && device->bdev != fs_info->sb->s_bdev)
591 close_bdev_excl(device->bdev);
597 int btrfs_verify_block_csum(struct btrfs_root *root,
598 struct extent_buffer *buf)
600 return btrfs_buffer_uptodate(buf);
603 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
604 u64 bytenr, u32 blocksize)
606 struct inode *btree_inode = root->fs_info->btree_inode;
607 struct extent_buffer *eb;
608 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
609 bytenr, blocksize, GFP_NOFS);
613 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
614 u64 bytenr, u32 blocksize)
616 struct inode *btree_inode = root->fs_info->btree_inode;
617 struct extent_buffer *eb;
619 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
620 bytenr, blocksize, NULL, GFP_NOFS);
625 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
628 struct extent_buffer *buf = NULL;
629 struct inode *btree_inode = root->fs_info->btree_inode;
630 struct extent_io_tree *io_tree;
633 io_tree = &BTRFS_I(btree_inode)->io_tree;
635 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
639 ret = btree_read_extent_buffer_pages(root, buf, 0);
642 buf->flags |= EXTENT_UPTODATE;
648 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
649 struct extent_buffer *buf)
651 struct inode *btree_inode = root->fs_info->btree_inode;
652 if (btrfs_header_generation(buf) ==
653 root->fs_info->running_transaction->transid)
654 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
659 int wait_on_tree_block_writeback(struct btrfs_root *root,
660 struct extent_buffer *buf)
662 struct inode *btree_inode = root->fs_info->btree_inode;
663 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
668 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
669 u32 stripesize, struct btrfs_root *root,
670 struct btrfs_fs_info *fs_info,
675 root->commit_root = NULL;
676 root->sectorsize = sectorsize;
677 root->nodesize = nodesize;
678 root->leafsize = leafsize;
679 root->stripesize = stripesize;
681 root->track_dirty = 0;
683 root->fs_info = fs_info;
684 root->objectid = objectid;
685 root->last_trans = 0;
686 root->highest_inode = 0;
687 root->last_inode_alloc = 0;
691 INIT_LIST_HEAD(&root->dirty_list);
692 memset(&root->root_key, 0, sizeof(root->root_key));
693 memset(&root->root_item, 0, sizeof(root->root_item));
694 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
695 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
696 init_completion(&root->kobj_unregister);
697 root->defrag_running = 0;
698 root->defrag_level = 0;
699 root->root_key.objectid = objectid;
703 static int find_and_setup_root(struct btrfs_root *tree_root,
704 struct btrfs_fs_info *fs_info,
706 struct btrfs_root *root)
711 __setup_root(tree_root->nodesize, tree_root->leafsize,
712 tree_root->sectorsize, tree_root->stripesize,
713 root, fs_info, objectid);
714 ret = btrfs_find_last_root(tree_root, objectid,
715 &root->root_item, &root->root_key);
718 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
719 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
725 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
726 struct btrfs_key *location)
728 struct btrfs_root *root;
729 struct btrfs_root *tree_root = fs_info->tree_root;
730 struct btrfs_path *path;
731 struct extent_buffer *l;
736 root = kzalloc(sizeof(*root), GFP_NOFS);
738 return ERR_PTR(-ENOMEM);
739 if (location->offset == (u64)-1) {
740 ret = find_and_setup_root(tree_root, fs_info,
741 location->objectid, root);
749 __setup_root(tree_root->nodesize, tree_root->leafsize,
750 tree_root->sectorsize, tree_root->stripesize,
751 root, fs_info, location->objectid);
753 path = btrfs_alloc_path();
755 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
762 read_extent_buffer(l, &root->root_item,
763 btrfs_item_ptr_offset(l, path->slots[0]),
764 sizeof(root->root_item));
765 memcpy(&root->root_key, location, sizeof(*location));
768 btrfs_release_path(root, path);
769 btrfs_free_path(path);
774 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
775 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
780 ret = btrfs_find_highest_inode(root, &highest_inode);
782 root->highest_inode = highest_inode;
783 root->last_inode_alloc = highest_inode;
788 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
791 struct btrfs_root *root;
793 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
794 return fs_info->tree_root;
795 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
796 return fs_info->extent_root;
798 root = radix_tree_lookup(&fs_info->fs_roots_radix,
799 (unsigned long)root_objectid);
803 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
804 struct btrfs_key *location)
806 struct btrfs_root *root;
809 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
810 return fs_info->tree_root;
811 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
812 return fs_info->extent_root;
813 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
814 return fs_info->chunk_root;
815 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
816 return fs_info->dev_root;
818 root = radix_tree_lookup(&fs_info->fs_roots_radix,
819 (unsigned long)location->objectid);
823 root = btrfs_read_fs_root_no_radix(fs_info, location);
826 ret = radix_tree_insert(&fs_info->fs_roots_radix,
827 (unsigned long)root->root_key.objectid,
830 free_extent_buffer(root->node);
834 ret = btrfs_find_dead_roots(fs_info->tree_root,
835 root->root_key.objectid, root);
841 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
842 struct btrfs_key *location,
843 const char *name, int namelen)
845 struct btrfs_root *root;
848 root = btrfs_read_fs_root_no_name(fs_info, location);
855 ret = btrfs_set_root_name(root, name, namelen);
857 free_extent_buffer(root->node);
862 ret = btrfs_sysfs_add_root(root);
864 free_extent_buffer(root->node);
873 static int add_hasher(struct btrfs_fs_info *info, char *type) {
874 struct btrfs_hasher *hasher;
876 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
879 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
880 if (!hasher->hash_tfm) {
884 spin_lock(&info->hash_lock);
885 list_add(&hasher->list, &info->hashers);
886 spin_unlock(&info->hash_lock);
891 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
893 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
895 struct list_head *cur;
896 struct btrfs_device *device;
897 struct backing_dev_info *bdi;
899 list_for_each(cur, &info->fs_devices->devices) {
900 device = list_entry(cur, struct btrfs_device, dev_list);
901 bdi = blk_get_backing_dev_info(device->bdev);
902 if (bdi && bdi_congested(bdi, bdi_bits)) {
911 * this unplugs every device on the box, and it is only used when page
914 static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
916 struct list_head *cur;
917 struct btrfs_device *device;
918 struct btrfs_fs_info *info;
920 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
921 list_for_each(cur, &info->fs_devices->devices) {
922 device = list_entry(cur, struct btrfs_device, dev_list);
923 bdi = blk_get_backing_dev_info(device->bdev);
924 if (bdi->unplug_io_fn) {
925 bdi->unplug_io_fn(bdi, page);
930 void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
933 struct extent_map_tree *em_tree;
934 struct extent_map *em;
935 struct address_space *mapping;
938 /* the generic O_DIRECT read code does this */
940 __unplug_io_fn(bdi, page);
945 * page->mapping may change at any time. Get a consistent copy
946 * and use that for everything below
949 mapping = page->mapping;
953 inode = mapping->host;
954 offset = page_offset(page);
956 em_tree = &BTRFS_I(inode)->extent_tree;
957 spin_lock(&em_tree->lock);
958 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
959 spin_unlock(&em_tree->lock);
963 offset = offset - em->start;
964 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
965 em->block_start + offset, page);
969 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
971 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
974 bdi->ra_pages = default_backing_dev_info.ra_pages;
976 bdi->capabilities = default_backing_dev_info.capabilities;
977 bdi->unplug_io_fn = btrfs_unplug_io_fn;
978 bdi->unplug_io_data = info;
979 bdi->congested_fn = btrfs_congested_fn;
980 bdi->congested_data = info;
984 static int bio_ready_for_csum(struct bio *bio)
990 struct extent_io_tree *io_tree = NULL;
991 struct btrfs_fs_info *info = NULL;
992 struct bio_vec *bvec;
996 bio_for_each_segment(bvec, bio, i) {
997 page = bvec->bv_page;
998 if (page->private == EXTENT_PAGE_PRIVATE) {
999 length += bvec->bv_len;
1002 if (!page->private) {
1003 length += bvec->bv_len;
1006 length = bvec->bv_len;
1007 buf_len = page->private >> 2;
1008 start = page_offset(page) + bvec->bv_offset;
1009 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1010 info = BTRFS_I(page->mapping->host)->root->fs_info;
1012 /* are we fully contained in this bio? */
1013 if (buf_len <= length)
1016 ret = extent_range_uptodate(io_tree, start + length,
1017 start + buf_len - 1);
1023 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1024 static void btrfs_end_io_csum(void *p)
1026 static void btrfs_end_io_csum(struct work_struct *work)
1029 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1030 struct btrfs_fs_info *fs_info = p;
1032 struct btrfs_fs_info *fs_info = container_of(work,
1033 struct btrfs_fs_info,
1036 unsigned long flags;
1037 struct end_io_wq *end_io_wq;
1039 struct list_head *next;
1044 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
1045 if (list_empty(&fs_info->end_io_work_list)) {
1046 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1050 next = fs_info->end_io_work_list.next;
1052 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
1054 end_io_wq = list_entry(next, struct end_io_wq, list);
1056 bio = end_io_wq->bio;
1057 if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
1058 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
1059 was_empty = list_empty(&fs_info->end_io_work_list);
1060 list_add_tail(&end_io_wq->list,
1061 &fs_info->end_io_work_list);
1062 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1068 error = end_io_wq->error;
1069 bio->bi_private = end_io_wq->private;
1070 bio->bi_end_io = end_io_wq->end_io;
1072 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
1073 bio_endio(bio, bio->bi_size, error);
1075 bio_endio(bio, error);
1080 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1081 static void btrfs_async_submit_work(void *p)
1083 static void btrfs_async_submit_work(struct work_struct *work)
1086 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1087 struct btrfs_fs_info *fs_info = p;
1089 struct btrfs_fs_info *fs_info = container_of(work,
1090 struct btrfs_fs_info,
1093 struct async_submit_bio *async;
1094 struct list_head *next;
1097 spin_lock(&fs_info->async_submit_work_lock);
1098 if (list_empty(&fs_info->async_submit_work_list)) {
1099 spin_unlock(&fs_info->async_submit_work_lock);
1102 next = fs_info->async_submit_work_list.next;
1104 spin_unlock(&fs_info->async_submit_work_lock);
1106 async = list_entry(next, struct async_submit_bio, list);
1107 async->submit_bio_hook(async->inode, async->rw, async->bio,
1113 struct btrfs_root *open_ctree(struct super_block *sb,
1114 struct btrfs_fs_devices *fs_devices)
1121 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
1123 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
1125 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
1127 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
1129 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
1133 struct btrfs_super_block *disk_super;
1135 if (!extent_root || !tree_root || !fs_info) {
1139 end_io_workqueue = create_workqueue("btrfs-end-io");
1140 BUG_ON(!end_io_workqueue);
1141 async_submit_workqueue = create_workqueue("btrfs-async-submit");
1143 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
1144 INIT_LIST_HEAD(&fs_info->trans_list);
1145 INIT_LIST_HEAD(&fs_info->dead_roots);
1146 INIT_LIST_HEAD(&fs_info->hashers);
1147 INIT_LIST_HEAD(&fs_info->end_io_work_list);
1148 INIT_LIST_HEAD(&fs_info->async_submit_work_list);
1149 spin_lock_init(&fs_info->hash_lock);
1150 spin_lock_init(&fs_info->end_io_work_lock);
1151 spin_lock_init(&fs_info->async_submit_work_lock);
1152 spin_lock_init(&fs_info->delalloc_lock);
1153 spin_lock_init(&fs_info->new_trans_lock);
1155 init_completion(&fs_info->kobj_unregister);
1156 sb_set_blocksize(sb, BTRFS_SUPER_INFO_SIZE);
1157 fs_info->tree_root = tree_root;
1158 fs_info->extent_root = extent_root;
1159 fs_info->chunk_root = chunk_root;
1160 fs_info->dev_root = dev_root;
1161 fs_info->fs_devices = fs_devices;
1162 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
1163 INIT_LIST_HEAD(&fs_info->space_info);
1164 btrfs_mapping_init(&fs_info->mapping_tree);
1166 fs_info->max_extent = (u64)-1;
1167 fs_info->max_inline = 8192 * 1024;
1168 setup_bdi(fs_info, &fs_info->bdi);
1169 fs_info->btree_inode = new_inode(sb);
1170 fs_info->btree_inode->i_ino = 1;
1171 fs_info->btree_inode->i_nlink = 1;
1174 * we set the i_size on the btree inode to the max possible int.
1175 * the real end of the address space is determined by all of
1176 * the devices in the system
1178 fs_info->btree_inode->i_size = OFFSET_MAX;
1179 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
1180 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1182 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
1183 fs_info->btree_inode->i_mapping,
1185 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1188 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1190 extent_io_tree_init(&fs_info->free_space_cache,
1191 fs_info->btree_inode->i_mapping, GFP_NOFS);
1192 extent_io_tree_init(&fs_info->block_group_cache,
1193 fs_info->btree_inode->i_mapping, GFP_NOFS);
1194 extent_io_tree_init(&fs_info->pinned_extents,
1195 fs_info->btree_inode->i_mapping, GFP_NOFS);
1196 extent_io_tree_init(&fs_info->pending_del,
1197 fs_info->btree_inode->i_mapping, GFP_NOFS);
1198 extent_io_tree_init(&fs_info->extent_ins,
1199 fs_info->btree_inode->i_mapping, GFP_NOFS);
1200 fs_info->do_barriers = 1;
1202 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1203 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum, fs_info);
1204 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work,
1206 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
1208 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum);
1209 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work);
1210 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
1212 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1213 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1214 sizeof(struct btrfs_key));
1215 insert_inode_hash(fs_info->btree_inode);
1216 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
1218 mutex_init(&fs_info->trans_mutex);
1219 mutex_init(&fs_info->fs_mutex);
1222 ret = add_hasher(fs_info, "crc32c");
1224 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
1229 __setup_root(4096, 4096, 4096, 4096, tree_root,
1230 fs_info, BTRFS_ROOT_TREE_OBJECTID);
1232 fs_info->sb_buffer = read_tree_block(tree_root,
1233 BTRFS_SUPER_INFO_OFFSET,
1236 if (!fs_info->sb_buffer)
1239 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
1240 sizeof(fs_info->super_copy));
1242 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
1243 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
1246 disk_super = &fs_info->super_copy;
1247 if (!btrfs_super_root(disk_super))
1248 goto fail_sb_buffer;
1250 if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
1251 printk("Btrfs: wanted %llu devices, but found %llu\n",
1252 (unsigned long long)btrfs_super_num_devices(disk_super),
1253 (unsigned long long)fs_devices->num_devices);
1254 goto fail_sb_buffer;
1256 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
1258 nodesize = btrfs_super_nodesize(disk_super);
1259 leafsize = btrfs_super_leafsize(disk_super);
1260 sectorsize = btrfs_super_sectorsize(disk_super);
1261 stripesize = btrfs_super_stripesize(disk_super);
1262 tree_root->nodesize = nodesize;
1263 tree_root->leafsize = leafsize;
1264 tree_root->sectorsize = sectorsize;
1265 tree_root->stripesize = stripesize;
1266 sb_set_blocksize(sb, sectorsize);
1268 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1269 sizeof(disk_super->magic))) {
1270 printk("btrfs: valid FS not found on %s\n", sb->s_id);
1271 goto fail_sb_buffer;
1274 mutex_lock(&fs_info->fs_mutex);
1276 ret = btrfs_read_sys_array(tree_root);
1278 printk("btrfs: failed to read the system array on %s\n",
1280 goto fail_sys_array;
1283 blocksize = btrfs_level_size(tree_root,
1284 btrfs_super_chunk_root_level(disk_super));
1286 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1287 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1289 chunk_root->node = read_tree_block(chunk_root,
1290 btrfs_super_chunk_root(disk_super),
1292 BUG_ON(!chunk_root->node);
1294 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
1295 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1298 ret = btrfs_read_chunk_tree(chunk_root);
1301 blocksize = btrfs_level_size(tree_root,
1302 btrfs_super_root_level(disk_super));
1305 tree_root->node = read_tree_block(tree_root,
1306 btrfs_super_root(disk_super),
1308 if (!tree_root->node)
1309 goto fail_sb_buffer;
1312 ret = find_and_setup_root(tree_root, fs_info,
1313 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
1315 goto fail_tree_root;
1316 extent_root->track_dirty = 1;
1318 ret = find_and_setup_root(tree_root, fs_info,
1319 BTRFS_DEV_TREE_OBJECTID, dev_root);
1320 dev_root->track_dirty = 1;
1323 goto fail_extent_root;
1325 btrfs_read_block_groups(extent_root);
1327 fs_info->generation = btrfs_super_generation(disk_super) + 1;
1328 fs_info->data_alloc_profile = (u64)-1;
1329 fs_info->metadata_alloc_profile = (u64)-1;
1330 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1332 mutex_unlock(&fs_info->fs_mutex);
1336 free_extent_buffer(extent_root->node);
1338 free_extent_buffer(tree_root->node);
1340 mutex_unlock(&fs_info->fs_mutex);
1342 free_extent_buffer(fs_info->sb_buffer);
1343 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1345 iput(fs_info->btree_inode);
1347 close_all_devices(fs_info);
1348 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1352 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1353 bdi_destroy(&fs_info->bdi);
1356 return ERR_PTR(err);
1359 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
1361 char b[BDEVNAME_SIZE];
1364 set_buffer_uptodate(bh);
1366 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
1367 printk(KERN_WARNING "lost page write due to "
1368 "I/O error on %s\n",
1369 bdevname(bh->b_bdev, b));
1371 set_buffer_write_io_error(bh);
1372 clear_buffer_uptodate(bh);
1378 int write_all_supers(struct btrfs_root *root)
1380 struct list_head *cur;
1381 struct list_head *head = &root->fs_info->fs_devices->devices;
1382 struct btrfs_device *dev;
1383 struct extent_buffer *sb;
1384 struct btrfs_dev_item *dev_item;
1385 struct buffer_head *bh;
1389 int total_errors = 0;
1391 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
1392 do_barriers = !btrfs_test_opt(root, NOBARRIER);
1394 sb = root->fs_info->sb_buffer;
1395 dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
1397 list_for_each(cur, head) {
1398 dev = list_entry(cur, struct btrfs_device, dev_list);
1399 btrfs_set_device_type(sb, dev_item, dev->type);
1400 btrfs_set_device_id(sb, dev_item, dev->devid);
1401 btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
1402 btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
1403 btrfs_set_device_io_align(sb, dev_item, dev->io_align);
1404 btrfs_set_device_io_width(sb, dev_item, dev->io_width);
1405 btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
1406 write_extent_buffer(sb, dev->uuid,
1407 (unsigned long)btrfs_device_uuid(dev_item),
1410 btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
1411 csum_tree_block(root, sb, 0);
1413 bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET /
1414 root->fs_info->sb->s_blocksize,
1415 BTRFS_SUPER_INFO_SIZE);
1417 read_extent_buffer(sb, bh->b_data, 0, BTRFS_SUPER_INFO_SIZE);
1418 dev->pending_io = bh;
1421 set_buffer_uptodate(bh);
1423 bh->b_end_io = btrfs_end_buffer_write_sync;
1425 if (do_barriers && dev->barriers) {
1426 ret = submit_bh(WRITE_BARRIER, bh);
1427 if (ret == -EOPNOTSUPP) {
1428 printk("btrfs: disabling barriers on dev %s\n",
1430 set_buffer_uptodate(bh);
1434 ret = submit_bh(WRITE, bh);
1437 ret = submit_bh(WRITE, bh);
1442 if (total_errors > max_errors) {
1443 printk("btrfs: %d errors while writing supers\n", total_errors);
1448 list_for_each(cur, head) {
1449 dev = list_entry(cur, struct btrfs_device, dev_list);
1450 BUG_ON(!dev->pending_io);
1451 bh = dev->pending_io;
1453 if (!buffer_uptodate(dev->pending_io)) {
1454 if (do_barriers && dev->barriers) {
1455 printk("btrfs: disabling barriers on dev %s\n",
1457 set_buffer_uptodate(bh);
1461 ret = submit_bh(WRITE, bh);
1464 BUG_ON(!buffer_uptodate(bh));
1470 dev->pending_io = NULL;
1473 if (total_errors > max_errors) {
1474 printk("btrfs: %d errors while writing supers\n", total_errors);
1480 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
1485 ret = write_all_supers(root);
1487 if (!btrfs_test_opt(root, NOBARRIER))
1488 blkdev_issue_flush(sb->s_bdev, NULL);
1489 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
1490 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
1491 super->start, super->len);
1492 if (!btrfs_test_opt(root, NOBARRIER))
1493 blkdev_issue_flush(sb->s_bdev, NULL);
1498 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
1500 radix_tree_delete(&fs_info->fs_roots_radix,
1501 (unsigned long)root->root_key.objectid);
1503 btrfs_sysfs_del_root(root);
1507 free_extent_buffer(root->node);
1508 if (root->commit_root)
1509 free_extent_buffer(root->commit_root);
1516 static int del_fs_roots(struct btrfs_fs_info *fs_info)
1519 struct btrfs_root *gang[8];
1523 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
1528 for (i = 0; i < ret; i++)
1529 btrfs_free_fs_root(fs_info, gang[i]);
1534 int close_ctree(struct btrfs_root *root)
1537 struct btrfs_trans_handle *trans;
1538 struct btrfs_fs_info *fs_info = root->fs_info;
1540 fs_info->closing = 1;
1541 btrfs_transaction_flush_work(root);
1542 mutex_lock(&fs_info->fs_mutex);
1543 btrfs_defrag_dirty_roots(root->fs_info);
1544 trans = btrfs_start_transaction(root, 1);
1545 ret = btrfs_commit_transaction(trans, root);
1546 /* run commit again to drop the original snapshot */
1547 trans = btrfs_start_transaction(root, 1);
1548 btrfs_commit_transaction(trans, root);
1549 ret = btrfs_write_and_wait_transaction(NULL, root);
1552 write_ctree_super(NULL, root);
1553 mutex_unlock(&fs_info->fs_mutex);
1555 btrfs_transaction_flush_work(root);
1557 if (fs_info->delalloc_bytes) {
1558 printk("btrfs: at unmount delalloc count %Lu\n",
1559 fs_info->delalloc_bytes);
1561 if (fs_info->extent_root->node)
1562 free_extent_buffer(fs_info->extent_root->node);
1564 if (fs_info->tree_root->node)
1565 free_extent_buffer(fs_info->tree_root->node);
1567 if (root->fs_info->chunk_root->node);
1568 free_extent_buffer(root->fs_info->chunk_root->node);
1570 if (root->fs_info->dev_root->node);
1571 free_extent_buffer(root->fs_info->dev_root->node);
1573 free_extent_buffer(fs_info->sb_buffer);
1575 btrfs_free_block_groups(root->fs_info);
1576 del_fs_roots(fs_info);
1578 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1580 extent_io_tree_empty_lru(&fs_info->free_space_cache);
1581 extent_io_tree_empty_lru(&fs_info->block_group_cache);
1582 extent_io_tree_empty_lru(&fs_info->pinned_extents);
1583 extent_io_tree_empty_lru(&fs_info->pending_del);
1584 extent_io_tree_empty_lru(&fs_info->extent_ins);
1585 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1587 flush_workqueue(async_submit_workqueue);
1588 flush_workqueue(end_io_workqueue);
1590 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
1592 flush_workqueue(async_submit_workqueue);
1593 destroy_workqueue(async_submit_workqueue);
1595 flush_workqueue(end_io_workqueue);
1596 destroy_workqueue(end_io_workqueue);
1598 iput(fs_info->btree_inode);
1600 while(!list_empty(&fs_info->hashers)) {
1601 struct btrfs_hasher *hasher;
1602 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
1604 list_del(&hasher->hashers);
1605 crypto_free_hash(&fs_info->hash_tfm);
1609 close_all_devices(fs_info);
1610 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1612 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1613 bdi_destroy(&fs_info->bdi);
1616 kfree(fs_info->extent_root);
1617 kfree(fs_info->tree_root);
1618 kfree(fs_info->chunk_root);
1619 kfree(fs_info->dev_root);
1623 int btrfs_buffer_uptodate(struct extent_buffer *buf)
1625 struct inode *btree_inode = buf->first_page->mapping->host;
1626 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
1629 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1631 struct inode *btree_inode = buf->first_page->mapping->host;
1632 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1636 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1638 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1639 u64 transid = btrfs_header_generation(buf);
1640 struct inode *btree_inode = root->fs_info->btree_inode;
1642 if (transid != root->fs_info->generation) {
1643 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1644 (unsigned long long)buf->start,
1645 transid, root->fs_info->generation);
1648 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1651 void btrfs_throttle(struct btrfs_root *root)
1653 struct backing_dev_info *bdi;
1655 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
1656 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
1657 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
1658 congestion_wait(WRITE, HZ/20);
1660 blk_congestion_wait(WRITE, HZ/20);
1665 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1667 struct extent_io_tree *tree;
1670 unsigned long thresh = 16 * 1024 * 1024;
1671 tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
1673 if (current_is_pdflush())
1676 num_dirty = count_range_bits(tree, &start, (u64)-1,
1677 thresh, EXTENT_DIRTY);
1678 if (num_dirty > thresh) {
1679 balance_dirty_pages_ratelimited_nr(
1680 root->fs_info->btree_inode->i_mapping, 1);
1684 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
1686 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1687 struct inode *btree_inode = root->fs_info->btree_inode;
1688 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1689 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
1692 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
1694 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1695 struct inode *btree_inode = root->fs_info->btree_inode;
1696 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1697 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
1701 int btrfs_buffer_defrag(struct extent_buffer *buf)
1703 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1704 struct inode *btree_inode = root->fs_info->btree_inode;
1705 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1706 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
1709 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
1711 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1712 struct inode *btree_inode = root->fs_info->btree_inode;
1713 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1714 buf->start, buf->start + buf->len - 1,
1715 EXTENT_DEFRAG_DONE, 0);
1718 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
1720 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1721 struct inode *btree_inode = root->fs_info->btree_inode;
1722 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1723 buf->start, buf->start + buf->len - 1,
1724 EXTENT_DEFRAG_DONE, GFP_NOFS);
1727 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
1729 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1730 struct inode *btree_inode = root->fs_info->btree_inode;
1731 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1732 buf->start, buf->start + buf->len - 1,
1733 EXTENT_DEFRAG, GFP_NOFS);
1736 int btrfs_read_buffer(struct extent_buffer *buf)
1738 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1740 ret = btree_read_extent_buffer_pages(root, buf, 0);
1742 buf->flags |= EXTENT_UPTODATE;
1747 static struct extent_io_ops btree_extent_io_ops = {
1748 .writepage_io_hook = btree_writepage_io_hook,
1749 .readpage_end_io_hook = btree_readpage_end_io_hook,
1750 .submit_bio_hook = btree_submit_bio_hook,
1751 /* note we're sharing with inode.c for the merge bio hook */
1752 .merge_bio_hook = btrfs_merge_bio_hook,