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 verify_parent_transid(struct extent_io_tree *io_tree,
209 struct extent_buffer *eb, u64 parent_transid)
213 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
216 lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS);
217 if (extent_buffer_uptodate(io_tree, eb) &&
218 btrfs_header_generation(eb) == parent_transid) {
222 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
223 (unsigned long long)eb->start,
224 (unsigned long long)parent_transid,
225 (unsigned long long)btrfs_header_generation(eb));
228 clear_extent_buffer_uptodate(io_tree, eb);
229 unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
235 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
236 struct extent_buffer *eb,
237 u64 start, u64 parent_transid)
239 struct extent_io_tree *io_tree;
244 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
246 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
247 btree_get_extent, mirror_num);
249 !verify_parent_transid(io_tree, eb, parent_transid))
252 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
258 if (mirror_num > num_copies)
264 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
266 struct extent_io_tree *tree;
267 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
271 struct extent_buffer *eb;
274 tree = &BTRFS_I(page->mapping->host)->io_tree;
276 if (page->private == EXTENT_PAGE_PRIVATE)
280 len = page->private >> 2;
284 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
285 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
286 btrfs_header_generation(eb));
288 btrfs_clear_buffer_defrag(eb);
289 found_start = btrfs_header_bytenr(eb);
290 if (found_start != start) {
291 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
292 start, found_start, len);
296 if (eb->first_page != page) {
297 printk("bad first page %lu %lu\n", eb->first_page->index,
302 if (!PageUptodate(page)) {
303 printk("csum not up to date page %lu\n", page->index);
307 found_level = btrfs_header_level(eb);
308 spin_lock(&root->fs_info->hash_lock);
309 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
310 spin_unlock(&root->fs_info->hash_lock);
311 csum_tree_block(root, eb, 0);
313 free_extent_buffer(eb);
318 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
320 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
322 csum_dirty_buffer(root, page);
326 int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
327 struct extent_state *state)
329 struct extent_io_tree *tree;
333 struct extent_buffer *eb;
334 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
337 tree = &BTRFS_I(page->mapping->host)->io_tree;
338 if (page->private == EXTENT_PAGE_PRIVATE)
342 len = page->private >> 2;
346 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
348 btrfs_clear_buffer_defrag(eb);
349 found_start = btrfs_header_bytenr(eb);
350 if (found_start != start) {
354 if (eb->first_page != page) {
355 printk("bad first page %lu %lu\n", eb->first_page->index,
361 if (memcmp_extent_buffer(eb, root->fs_info->fsid,
362 (unsigned long)btrfs_header_fsid(eb),
364 printk("bad fsid on block %Lu\n", eb->start);
368 found_level = btrfs_header_level(eb);
370 ret = csum_tree_block(root, eb, 1);
374 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
375 end = eb->start + end - 1;
376 release_extent_buffer_tail_pages(eb);
378 free_extent_buffer(eb);
383 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
384 static void end_workqueue_bio(struct bio *bio, int err)
386 static int end_workqueue_bio(struct bio *bio,
387 unsigned int bytes_done, int err)
390 struct end_io_wq *end_io_wq = bio->bi_private;
391 struct btrfs_fs_info *fs_info;
394 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
399 fs_info = end_io_wq->info;
400 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
401 end_io_wq->error = err;
402 list_add_tail(&end_io_wq->list, &fs_info->end_io_work_list);
403 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
404 queue_work(end_io_workqueue, &fs_info->end_io_work);
406 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
411 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
414 struct end_io_wq *end_io_wq;
415 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
419 end_io_wq->private = bio->bi_private;
420 end_io_wq->end_io = bio->bi_end_io;
421 end_io_wq->info = info;
422 end_io_wq->error = 0;
423 end_io_wq->bio = bio;
424 end_io_wq->metadata = metadata;
426 bio->bi_private = end_io_wq;
427 bio->bi_end_io = end_workqueue_bio;
431 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
432 int rw, struct bio *bio, int mirror_num,
433 extent_submit_bio_hook_t *submit_bio_hook)
435 struct async_submit_bio *async;
437 async = kmalloc(sizeof(*async), GFP_NOFS);
441 async->inode = inode;
444 async->mirror_num = mirror_num;
445 async->submit_bio_hook = submit_bio_hook;
447 spin_lock(&fs_info->async_submit_work_lock);
448 list_add_tail(&async->list, &fs_info->async_submit_work_list);
449 atomic_inc(&fs_info->nr_async_submits);
450 spin_unlock(&fs_info->async_submit_work_lock);
452 queue_work(async_submit_workqueue, &fs_info->async_submit_work);
456 static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
459 struct btrfs_root *root = BTRFS_I(inode)->root;
463 offset = bio->bi_sector << 9;
465 if (rw & (1 << BIO_RW)) {
466 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
469 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
472 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
475 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
478 if (!(rw & (1 << BIO_RW))) {
479 return __btree_submit_bio_hook(inode, rw, bio, mirror_num);
481 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
482 inode, rw, bio, mirror_num,
483 __btree_submit_bio_hook);
486 static int btree_writepage(struct page *page, struct writeback_control *wbc)
488 struct extent_io_tree *tree;
489 tree = &BTRFS_I(page->mapping->host)->io_tree;
490 return extent_write_full_page(tree, page, btree_get_extent, wbc);
493 static int btree_writepages(struct address_space *mapping,
494 struct writeback_control *wbc)
496 struct extent_io_tree *tree;
497 tree = &BTRFS_I(mapping->host)->io_tree;
498 if (wbc->sync_mode == WB_SYNC_NONE) {
501 unsigned long thresh = 96 * 1024 * 1024;
503 if (wbc->for_kupdate)
506 if (current_is_pdflush()) {
507 thresh = 96 * 1024 * 1024;
509 thresh = 8 * 1024 * 1024;
511 num_dirty = count_range_bits(tree, &start, (u64)-1,
512 thresh, EXTENT_DIRTY);
513 if (num_dirty < thresh) {
517 return extent_writepages(tree, mapping, btree_get_extent, wbc);
520 int btree_readpage(struct file *file, struct page *page)
522 struct extent_io_tree *tree;
523 tree = &BTRFS_I(page->mapping->host)->io_tree;
524 return extent_read_full_page(tree, page, btree_get_extent);
527 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
529 struct extent_io_tree *tree;
530 struct extent_map_tree *map;
533 if (page_count(page) > 3) {
534 /* once for page->private, once for the caller, once
535 * once for the page cache
539 tree = &BTRFS_I(page->mapping->host)->io_tree;
540 map = &BTRFS_I(page->mapping->host)->extent_tree;
541 ret = try_release_extent_state(map, tree, page, gfp_flags);
543 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
544 ClearPagePrivate(page);
545 set_page_private(page, 0);
546 page_cache_release(page);
551 static void btree_invalidatepage(struct page *page, unsigned long offset)
553 struct extent_io_tree *tree;
554 tree = &BTRFS_I(page->mapping->host)->io_tree;
555 extent_invalidatepage(tree, page, offset);
556 btree_releasepage(page, GFP_NOFS);
557 if (PagePrivate(page)) {
558 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
559 ClearPagePrivate(page);
560 set_page_private(page, 0);
561 page_cache_release(page);
566 static int btree_writepage(struct page *page, struct writeback_control *wbc)
568 struct buffer_head *bh;
569 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
570 struct buffer_head *head;
571 if (!page_has_buffers(page)) {
572 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
573 (1 << BH_Dirty)|(1 << BH_Uptodate));
575 head = page_buffers(page);
578 if (buffer_dirty(bh))
579 csum_tree_block(root, bh, 0);
580 bh = bh->b_this_page;
581 } while (bh != head);
582 return block_write_full_page(page, btree_get_block, wbc);
586 static struct address_space_operations btree_aops = {
587 .readpage = btree_readpage,
588 .writepage = btree_writepage,
589 .writepages = btree_writepages,
590 .releasepage = btree_releasepage,
591 .invalidatepage = btree_invalidatepage,
592 .sync_page = block_sync_page,
595 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
598 struct extent_buffer *buf = NULL;
599 struct inode *btree_inode = root->fs_info->btree_inode;
602 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
605 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
606 buf, 0, 0, btree_get_extent, 0);
607 free_extent_buffer(buf);
611 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
612 u64 bytenr, u32 blocksize)
614 struct inode *btree_inode = root->fs_info->btree_inode;
615 struct extent_buffer *eb;
616 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
617 bytenr, blocksize, GFP_NOFS);
621 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
622 u64 bytenr, u32 blocksize)
624 struct inode *btree_inode = root->fs_info->btree_inode;
625 struct extent_buffer *eb;
627 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
628 bytenr, blocksize, NULL, GFP_NOFS);
633 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
634 u32 blocksize, u64 parent_transid)
636 struct extent_buffer *buf = NULL;
637 struct inode *btree_inode = root->fs_info->btree_inode;
638 struct extent_io_tree *io_tree;
641 io_tree = &BTRFS_I(btree_inode)->io_tree;
643 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
647 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
650 buf->flags |= EXTENT_UPTODATE;
656 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
657 struct extent_buffer *buf)
659 struct inode *btree_inode = root->fs_info->btree_inode;
660 if (btrfs_header_generation(buf) ==
661 root->fs_info->running_transaction->transid)
662 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
667 int wait_on_tree_block_writeback(struct btrfs_root *root,
668 struct extent_buffer *buf)
670 struct inode *btree_inode = root->fs_info->btree_inode;
671 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
676 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
677 u32 stripesize, struct btrfs_root *root,
678 struct btrfs_fs_info *fs_info,
683 root->commit_root = NULL;
684 root->sectorsize = sectorsize;
685 root->nodesize = nodesize;
686 root->leafsize = leafsize;
687 root->stripesize = stripesize;
689 root->track_dirty = 0;
691 root->fs_info = fs_info;
692 root->objectid = objectid;
693 root->last_trans = 0;
694 root->highest_inode = 0;
695 root->last_inode_alloc = 0;
699 INIT_LIST_HEAD(&root->dirty_list);
700 memset(&root->root_key, 0, sizeof(root->root_key));
701 memset(&root->root_item, 0, sizeof(root->root_item));
702 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
703 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
704 init_completion(&root->kobj_unregister);
705 root->defrag_running = 0;
706 root->defrag_level = 0;
707 root->root_key.objectid = objectid;
711 static int find_and_setup_root(struct btrfs_root *tree_root,
712 struct btrfs_fs_info *fs_info,
714 struct btrfs_root *root)
719 __setup_root(tree_root->nodesize, tree_root->leafsize,
720 tree_root->sectorsize, tree_root->stripesize,
721 root, fs_info, objectid);
722 ret = btrfs_find_last_root(tree_root, objectid,
723 &root->root_item, &root->root_key);
726 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
727 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
733 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
734 struct btrfs_key *location)
736 struct btrfs_root *root;
737 struct btrfs_root *tree_root = fs_info->tree_root;
738 struct btrfs_path *path;
739 struct extent_buffer *l;
744 root = kzalloc(sizeof(*root), GFP_NOFS);
746 return ERR_PTR(-ENOMEM);
747 if (location->offset == (u64)-1) {
748 ret = find_and_setup_root(tree_root, fs_info,
749 location->objectid, root);
757 __setup_root(tree_root->nodesize, tree_root->leafsize,
758 tree_root->sectorsize, tree_root->stripesize,
759 root, fs_info, location->objectid);
761 path = btrfs_alloc_path();
763 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
770 read_extent_buffer(l, &root->root_item,
771 btrfs_item_ptr_offset(l, path->slots[0]),
772 sizeof(root->root_item));
773 memcpy(&root->root_key, location, sizeof(*location));
776 btrfs_release_path(root, path);
777 btrfs_free_path(path);
782 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
783 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
788 ret = btrfs_find_highest_inode(root, &highest_inode);
790 root->highest_inode = highest_inode;
791 root->last_inode_alloc = highest_inode;
796 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
799 struct btrfs_root *root;
801 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
802 return fs_info->tree_root;
803 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
804 return fs_info->extent_root;
806 root = radix_tree_lookup(&fs_info->fs_roots_radix,
807 (unsigned long)root_objectid);
811 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
812 struct btrfs_key *location)
814 struct btrfs_root *root;
817 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
818 return fs_info->tree_root;
819 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
820 return fs_info->extent_root;
821 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
822 return fs_info->chunk_root;
823 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
824 return fs_info->dev_root;
826 root = radix_tree_lookup(&fs_info->fs_roots_radix,
827 (unsigned long)location->objectid);
831 root = btrfs_read_fs_root_no_radix(fs_info, location);
834 ret = radix_tree_insert(&fs_info->fs_roots_radix,
835 (unsigned long)root->root_key.objectid,
838 free_extent_buffer(root->node);
842 ret = btrfs_find_dead_roots(fs_info->tree_root,
843 root->root_key.objectid, root);
849 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
850 struct btrfs_key *location,
851 const char *name, int namelen)
853 struct btrfs_root *root;
856 root = btrfs_read_fs_root_no_name(fs_info, location);
863 ret = btrfs_set_root_name(root, name, namelen);
865 free_extent_buffer(root->node);
870 ret = btrfs_sysfs_add_root(root);
872 free_extent_buffer(root->node);
881 static int add_hasher(struct btrfs_fs_info *info, char *type) {
882 struct btrfs_hasher *hasher;
884 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
887 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
888 if (!hasher->hash_tfm) {
892 spin_lock(&info->hash_lock);
893 list_add(&hasher->list, &info->hashers);
894 spin_unlock(&info->hash_lock);
899 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
901 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
903 int limit = 256 * info->fs_devices->open_devices;
904 struct list_head *cur;
905 struct btrfs_device *device;
906 struct backing_dev_info *bdi;
908 if ((bdi_bits & (1 << BDI_write_congested)) &&
909 atomic_read(&info->nr_async_submits) > limit) {
913 list_for_each(cur, &info->fs_devices->devices) {
914 device = list_entry(cur, struct btrfs_device, dev_list);
917 bdi = blk_get_backing_dev_info(device->bdev);
918 if (bdi && bdi_congested(bdi, bdi_bits)) {
927 * this unplugs every device on the box, and it is only used when page
930 static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
932 struct list_head *cur;
933 struct btrfs_device *device;
934 struct btrfs_fs_info *info;
936 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
937 list_for_each(cur, &info->fs_devices->devices) {
938 device = list_entry(cur, struct btrfs_device, dev_list);
939 bdi = blk_get_backing_dev_info(device->bdev);
940 if (bdi->unplug_io_fn) {
941 bdi->unplug_io_fn(bdi, page);
946 void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
949 struct extent_map_tree *em_tree;
950 struct extent_map *em;
951 struct address_space *mapping;
954 /* the generic O_DIRECT read code does this */
956 __unplug_io_fn(bdi, page);
961 * page->mapping may change at any time. Get a consistent copy
962 * and use that for everything below
965 mapping = page->mapping;
969 inode = mapping->host;
970 offset = page_offset(page);
972 em_tree = &BTRFS_I(inode)->extent_tree;
973 spin_lock(&em_tree->lock);
974 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
975 spin_unlock(&em_tree->lock);
979 offset = offset - em->start;
980 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
981 em->block_start + offset, page);
985 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
987 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
990 bdi->ra_pages = default_backing_dev_info.ra_pages;
992 bdi->capabilities = default_backing_dev_info.capabilities;
993 bdi->unplug_io_fn = btrfs_unplug_io_fn;
994 bdi->unplug_io_data = info;
995 bdi->congested_fn = btrfs_congested_fn;
996 bdi->congested_data = info;
1000 static int bio_ready_for_csum(struct bio *bio)
1006 struct extent_io_tree *io_tree = NULL;
1007 struct btrfs_fs_info *info = NULL;
1008 struct bio_vec *bvec;
1012 bio_for_each_segment(bvec, bio, i) {
1013 page = bvec->bv_page;
1014 if (page->private == EXTENT_PAGE_PRIVATE) {
1015 length += bvec->bv_len;
1018 if (!page->private) {
1019 length += bvec->bv_len;
1022 length = bvec->bv_len;
1023 buf_len = page->private >> 2;
1024 start = page_offset(page) + bvec->bv_offset;
1025 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1026 info = BTRFS_I(page->mapping->host)->root->fs_info;
1028 /* are we fully contained in this bio? */
1029 if (buf_len <= length)
1032 ret = extent_range_uptodate(io_tree, start + length,
1033 start + buf_len - 1);
1039 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1040 static void btrfs_end_io_csum(void *p)
1042 static void btrfs_end_io_csum(struct work_struct *work)
1045 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1046 struct btrfs_fs_info *fs_info = p;
1048 struct btrfs_fs_info *fs_info = container_of(work,
1049 struct btrfs_fs_info,
1052 unsigned long flags;
1053 struct end_io_wq *end_io_wq;
1055 struct list_head *next;
1060 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
1061 if (list_empty(&fs_info->end_io_work_list)) {
1062 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1066 next = fs_info->end_io_work_list.next;
1068 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
1070 end_io_wq = list_entry(next, struct end_io_wq, list);
1072 bio = end_io_wq->bio;
1073 if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
1074 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
1075 was_empty = list_empty(&fs_info->end_io_work_list);
1076 list_add_tail(&end_io_wq->list,
1077 &fs_info->end_io_work_list);
1078 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1084 error = end_io_wq->error;
1085 bio->bi_private = end_io_wq->private;
1086 bio->bi_end_io = end_io_wq->end_io;
1088 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
1089 bio_endio(bio, bio->bi_size, error);
1091 bio_endio(bio, error);
1096 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1097 static void btrfs_async_submit_work(void *p)
1099 static void btrfs_async_submit_work(struct work_struct *work)
1102 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1103 struct btrfs_fs_info *fs_info = p;
1105 struct btrfs_fs_info *fs_info = container_of(work,
1106 struct btrfs_fs_info,
1109 struct async_submit_bio *async;
1110 struct list_head *next;
1113 spin_lock(&fs_info->async_submit_work_lock);
1114 if (list_empty(&fs_info->async_submit_work_list)) {
1115 spin_unlock(&fs_info->async_submit_work_lock);
1118 next = fs_info->async_submit_work_list.next;
1120 atomic_dec(&fs_info->nr_async_submits);
1121 spin_unlock(&fs_info->async_submit_work_lock);
1123 async = list_entry(next, struct async_submit_bio, list);
1124 async->submit_bio_hook(async->inode, async->rw, async->bio,
1130 struct btrfs_root *open_ctree(struct super_block *sb,
1131 struct btrfs_fs_devices *fs_devices,
1139 struct buffer_head *bh;
1140 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
1142 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
1144 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
1146 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
1148 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
1152 struct btrfs_super_block *disk_super;
1154 if (!extent_root || !tree_root || !fs_info) {
1158 end_io_workqueue = create_workqueue("btrfs-end-io");
1159 BUG_ON(!end_io_workqueue);
1160 async_submit_workqueue = create_workqueue("btrfs-async-submit");
1162 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
1163 INIT_LIST_HEAD(&fs_info->trans_list);
1164 INIT_LIST_HEAD(&fs_info->dead_roots);
1165 INIT_LIST_HEAD(&fs_info->hashers);
1166 INIT_LIST_HEAD(&fs_info->end_io_work_list);
1167 INIT_LIST_HEAD(&fs_info->async_submit_work_list);
1168 spin_lock_init(&fs_info->hash_lock);
1169 spin_lock_init(&fs_info->end_io_work_lock);
1170 spin_lock_init(&fs_info->async_submit_work_lock);
1171 spin_lock_init(&fs_info->delalloc_lock);
1172 spin_lock_init(&fs_info->new_trans_lock);
1174 init_completion(&fs_info->kobj_unregister);
1175 fs_info->tree_root = tree_root;
1176 fs_info->extent_root = extent_root;
1177 fs_info->chunk_root = chunk_root;
1178 fs_info->dev_root = dev_root;
1179 fs_info->fs_devices = fs_devices;
1180 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
1181 INIT_LIST_HEAD(&fs_info->space_info);
1182 btrfs_mapping_init(&fs_info->mapping_tree);
1183 atomic_set(&fs_info->nr_async_submits, 0);
1185 fs_info->max_extent = (u64)-1;
1186 fs_info->max_inline = 8192 * 1024;
1187 setup_bdi(fs_info, &fs_info->bdi);
1188 fs_info->btree_inode = new_inode(sb);
1189 fs_info->btree_inode->i_ino = 1;
1190 fs_info->btree_inode->i_nlink = 1;
1192 sb->s_blocksize = 4096;
1193 sb->s_blocksize_bits = blksize_bits(4096);
1196 * we set the i_size on the btree inode to the max possible int.
1197 * the real end of the address space is determined by all of
1198 * the devices in the system
1200 fs_info->btree_inode->i_size = OFFSET_MAX;
1201 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
1202 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1204 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
1205 fs_info->btree_inode->i_mapping,
1207 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1210 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1212 extent_io_tree_init(&fs_info->free_space_cache,
1213 fs_info->btree_inode->i_mapping, GFP_NOFS);
1214 extent_io_tree_init(&fs_info->block_group_cache,
1215 fs_info->btree_inode->i_mapping, GFP_NOFS);
1216 extent_io_tree_init(&fs_info->pinned_extents,
1217 fs_info->btree_inode->i_mapping, GFP_NOFS);
1218 extent_io_tree_init(&fs_info->pending_del,
1219 fs_info->btree_inode->i_mapping, GFP_NOFS);
1220 extent_io_tree_init(&fs_info->extent_ins,
1221 fs_info->btree_inode->i_mapping, GFP_NOFS);
1222 fs_info->do_barriers = 1;
1224 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1225 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum, fs_info);
1226 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work,
1228 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
1230 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum);
1231 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work);
1232 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
1234 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1235 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1236 sizeof(struct btrfs_key));
1237 insert_inode_hash(fs_info->btree_inode);
1238 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
1240 mutex_init(&fs_info->trans_mutex);
1241 mutex_init(&fs_info->fs_mutex);
1244 ret = add_hasher(fs_info, "crc32c");
1246 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
1251 __setup_root(4096, 4096, 4096, 4096, tree_root,
1252 fs_info, BTRFS_ROOT_TREE_OBJECTID);
1255 bh = __bread(fs_devices->latest_bdev,
1256 BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
1260 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
1263 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
1265 disk_super = &fs_info->super_copy;
1266 if (!btrfs_super_root(disk_super))
1267 goto fail_sb_buffer;
1269 err = btrfs_parse_options(tree_root, options);
1271 goto fail_sb_buffer;
1274 if (btrfs_super_num_devices(disk_super) > fs_devices->open_devices) {
1275 printk("Btrfs: wanted %llu devices, but found %llu\n",
1276 (unsigned long long)btrfs_super_num_devices(disk_super),
1277 (unsigned long long)fs_devices->open_devices);
1278 if (btrfs_test_opt(tree_root, DEGRADED))
1279 printk("continuing in degraded mode\n");
1281 goto fail_sb_buffer;
1285 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
1287 nodesize = btrfs_super_nodesize(disk_super);
1288 leafsize = btrfs_super_leafsize(disk_super);
1289 sectorsize = btrfs_super_sectorsize(disk_super);
1290 stripesize = btrfs_super_stripesize(disk_super);
1291 tree_root->nodesize = nodesize;
1292 tree_root->leafsize = leafsize;
1293 tree_root->sectorsize = sectorsize;
1294 tree_root->stripesize = stripesize;
1296 sb->s_blocksize = sectorsize;
1297 sb->s_blocksize_bits = blksize_bits(sectorsize);
1299 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1300 sizeof(disk_super->magic))) {
1301 printk("btrfs: valid FS not found on %s\n", sb->s_id);
1302 goto fail_sb_buffer;
1305 mutex_lock(&fs_info->fs_mutex);
1307 ret = btrfs_read_sys_array(tree_root);
1309 printk("btrfs: failed to read the system array on %s\n",
1311 goto fail_sys_array;
1314 blocksize = btrfs_level_size(tree_root,
1315 btrfs_super_chunk_root_level(disk_super));
1317 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1318 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1320 chunk_root->node = read_tree_block(chunk_root,
1321 btrfs_super_chunk_root(disk_super),
1323 BUG_ON(!chunk_root->node);
1325 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
1326 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1329 ret = btrfs_read_chunk_tree(chunk_root);
1332 btrfs_close_extra_devices(fs_devices);
1334 blocksize = btrfs_level_size(tree_root,
1335 btrfs_super_root_level(disk_super));
1338 tree_root->node = read_tree_block(tree_root,
1339 btrfs_super_root(disk_super),
1341 if (!tree_root->node)
1342 goto fail_sb_buffer;
1345 ret = find_and_setup_root(tree_root, fs_info,
1346 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
1348 goto fail_tree_root;
1349 extent_root->track_dirty = 1;
1351 ret = find_and_setup_root(tree_root, fs_info,
1352 BTRFS_DEV_TREE_OBJECTID, dev_root);
1353 dev_root->track_dirty = 1;
1356 goto fail_extent_root;
1358 btrfs_read_block_groups(extent_root);
1360 fs_info->generation = btrfs_super_generation(disk_super) + 1;
1361 fs_info->data_alloc_profile = (u64)-1;
1362 fs_info->metadata_alloc_profile = (u64)-1;
1363 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1365 mutex_unlock(&fs_info->fs_mutex);
1369 free_extent_buffer(extent_root->node);
1371 free_extent_buffer(tree_root->node);
1373 mutex_unlock(&fs_info->fs_mutex);
1375 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1377 iput(fs_info->btree_inode);
1379 btrfs_close_devices(fs_info->fs_devices);
1380 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1384 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
1385 bdi_destroy(&fs_info->bdi);
1388 return ERR_PTR(err);
1391 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
1393 char b[BDEVNAME_SIZE];
1396 set_buffer_uptodate(bh);
1398 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
1399 printk(KERN_WARNING "lost page write due to "
1400 "I/O error on %s\n",
1401 bdevname(bh->b_bdev, b));
1403 /* note, we dont' set_buffer_write_io_error because we have
1404 * our own ways of dealing with the IO errors
1406 clear_buffer_uptodate(bh);
1412 int write_all_supers(struct btrfs_root *root)
1414 struct list_head *cur;
1415 struct list_head *head = &root->fs_info->fs_devices->devices;
1416 struct btrfs_device *dev;
1417 struct btrfs_super_block *sb;
1418 struct btrfs_dev_item *dev_item;
1419 struct buffer_head *bh;
1423 int total_errors = 0;
1427 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
1428 do_barriers = !btrfs_test_opt(root, NOBARRIER);
1430 sb = &root->fs_info->super_for_commit;
1431 dev_item = &sb->dev_item;
1432 list_for_each(cur, head) {
1433 dev = list_entry(cur, struct btrfs_device, dev_list);
1438 if (!dev->in_fs_metadata)
1441 btrfs_set_stack_device_type(dev_item, dev->type);
1442 btrfs_set_stack_device_id(dev_item, dev->devid);
1443 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1444 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1445 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1446 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1447 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1448 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1449 flags = btrfs_super_flags(sb);
1450 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1454 crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc,
1455 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1456 btrfs_csum_final(crc, sb->csum);
1458 bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096,
1459 BTRFS_SUPER_INFO_SIZE);
1461 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
1462 dev->pending_io = bh;
1465 set_buffer_uptodate(bh);
1467 bh->b_end_io = btrfs_end_buffer_write_sync;
1469 if (do_barriers && dev->barriers) {
1470 ret = submit_bh(WRITE_BARRIER, bh);
1471 if (ret == -EOPNOTSUPP) {
1472 printk("btrfs: disabling barriers on dev %s\n",
1474 set_buffer_uptodate(bh);
1478 ret = submit_bh(WRITE, bh);
1481 ret = submit_bh(WRITE, bh);
1486 if (total_errors > max_errors) {
1487 printk("btrfs: %d errors while writing supers\n", total_errors);
1492 list_for_each(cur, head) {
1493 dev = list_entry(cur, struct btrfs_device, dev_list);
1496 if (!dev->in_fs_metadata)
1499 BUG_ON(!dev->pending_io);
1500 bh = dev->pending_io;
1502 if (!buffer_uptodate(dev->pending_io)) {
1503 if (do_barriers && dev->barriers) {
1504 printk("btrfs: disabling barriers on dev %s\n",
1506 set_buffer_uptodate(bh);
1510 ret = submit_bh(WRITE, bh);
1513 if (!buffer_uptodate(bh))
1520 dev->pending_io = NULL;
1523 if (total_errors > max_errors) {
1524 printk("btrfs: %d errors while writing supers\n", total_errors);
1530 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
1535 ret = write_all_supers(root);
1539 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
1541 radix_tree_delete(&fs_info->fs_roots_radix,
1542 (unsigned long)root->root_key.objectid);
1544 btrfs_sysfs_del_root(root);
1548 free_extent_buffer(root->node);
1549 if (root->commit_root)
1550 free_extent_buffer(root->commit_root);
1557 static int del_fs_roots(struct btrfs_fs_info *fs_info)
1560 struct btrfs_root *gang[8];
1564 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
1569 for (i = 0; i < ret; i++)
1570 btrfs_free_fs_root(fs_info, gang[i]);
1575 int close_ctree(struct btrfs_root *root)
1578 struct btrfs_trans_handle *trans;
1579 struct btrfs_fs_info *fs_info = root->fs_info;
1581 fs_info->closing = 1;
1582 btrfs_transaction_flush_work(root);
1583 mutex_lock(&fs_info->fs_mutex);
1584 btrfs_defrag_dirty_roots(root->fs_info);
1585 trans = btrfs_start_transaction(root, 1);
1586 ret = btrfs_commit_transaction(trans, root);
1587 /* run commit again to drop the original snapshot */
1588 trans = btrfs_start_transaction(root, 1);
1589 btrfs_commit_transaction(trans, root);
1590 ret = btrfs_write_and_wait_transaction(NULL, root);
1593 write_ctree_super(NULL, root);
1594 mutex_unlock(&fs_info->fs_mutex);
1596 btrfs_transaction_flush_work(root);
1598 if (fs_info->delalloc_bytes) {
1599 printk("btrfs: at unmount delalloc count %Lu\n",
1600 fs_info->delalloc_bytes);
1602 if (fs_info->extent_root->node)
1603 free_extent_buffer(fs_info->extent_root->node);
1605 if (fs_info->tree_root->node)
1606 free_extent_buffer(fs_info->tree_root->node);
1608 if (root->fs_info->chunk_root->node);
1609 free_extent_buffer(root->fs_info->chunk_root->node);
1611 if (root->fs_info->dev_root->node);
1612 free_extent_buffer(root->fs_info->dev_root->node);
1614 btrfs_free_block_groups(root->fs_info);
1615 del_fs_roots(fs_info);
1617 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1619 extent_io_tree_empty_lru(&fs_info->free_space_cache);
1620 extent_io_tree_empty_lru(&fs_info->block_group_cache);
1621 extent_io_tree_empty_lru(&fs_info->pinned_extents);
1622 extent_io_tree_empty_lru(&fs_info->pending_del);
1623 extent_io_tree_empty_lru(&fs_info->extent_ins);
1624 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1626 flush_workqueue(async_submit_workqueue);
1627 flush_workqueue(end_io_workqueue);
1629 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
1631 flush_workqueue(async_submit_workqueue);
1632 destroy_workqueue(async_submit_workqueue);
1634 flush_workqueue(end_io_workqueue);
1635 destroy_workqueue(end_io_workqueue);
1637 iput(fs_info->btree_inode);
1639 while(!list_empty(&fs_info->hashers)) {
1640 struct btrfs_hasher *hasher;
1641 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
1643 list_del(&hasher->hashers);
1644 crypto_free_hash(&fs_info->hash_tfm);
1648 btrfs_close_devices(fs_info->fs_devices);
1649 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1651 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
1652 bdi_destroy(&fs_info->bdi);
1655 kfree(fs_info->extent_root);
1656 kfree(fs_info->tree_root);
1657 kfree(fs_info->chunk_root);
1658 kfree(fs_info->dev_root);
1662 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1665 struct inode *btree_inode = buf->first_page->mapping->host;
1667 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
1671 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
1676 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1678 struct inode *btree_inode = buf->first_page->mapping->host;
1679 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1683 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1685 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1686 u64 transid = btrfs_header_generation(buf);
1687 struct inode *btree_inode = root->fs_info->btree_inode;
1689 if (transid != root->fs_info->generation) {
1690 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1691 (unsigned long long)buf->start,
1692 transid, root->fs_info->generation);
1695 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1698 void btrfs_throttle(struct btrfs_root *root)
1700 struct backing_dev_info *bdi;
1702 bdi = &root->fs_info->bdi;
1703 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
1704 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
1705 congestion_wait(WRITE, HZ/20);
1707 blk_congestion_wait(WRITE, HZ/20);
1712 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1715 * looks as though older kernels can get into trouble with
1716 * this code, they end up stuck in balance_dirty_pages forever
1718 struct extent_io_tree *tree;
1721 unsigned long thresh = 16 * 1024 * 1024;
1722 tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
1724 if (current_is_pdflush())
1727 num_dirty = count_range_bits(tree, &start, (u64)-1,
1728 thresh, EXTENT_DIRTY);
1729 if (num_dirty > thresh) {
1730 balance_dirty_pages_ratelimited_nr(
1731 root->fs_info->btree_inode->i_mapping, 1);
1736 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
1738 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1739 struct inode *btree_inode = root->fs_info->btree_inode;
1740 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1741 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
1744 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
1746 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1747 struct inode *btree_inode = root->fs_info->btree_inode;
1748 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1749 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
1753 int btrfs_buffer_defrag(struct extent_buffer *buf)
1755 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1756 struct inode *btree_inode = root->fs_info->btree_inode;
1757 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1758 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
1761 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
1763 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1764 struct inode *btree_inode = root->fs_info->btree_inode;
1765 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1766 buf->start, buf->start + buf->len - 1,
1767 EXTENT_DEFRAG_DONE, 0);
1770 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
1772 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1773 struct inode *btree_inode = root->fs_info->btree_inode;
1774 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1775 buf->start, buf->start + buf->len - 1,
1776 EXTENT_DEFRAG_DONE, GFP_NOFS);
1779 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
1781 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1782 struct inode *btree_inode = root->fs_info->btree_inode;
1783 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1784 buf->start, buf->start + buf->len - 1,
1785 EXTENT_DEFRAG, GFP_NOFS);
1788 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
1790 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1792 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
1794 buf->flags |= EXTENT_UPTODATE;
1799 static struct extent_io_ops btree_extent_io_ops = {
1800 .writepage_io_hook = btree_writepage_io_hook,
1801 .readpage_end_io_hook = btree_readpage_end_io_hook,
1802 .submit_bio_hook = btree_submit_bio_hook,
1803 /* note we're sharing with inode.c for the merge bio hook */
1804 .merge_bio_hook = btrfs_merge_bio_hook,