16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 19e20d96d6SChris Mason #include <linux/fs.h> 20d98237b3SChris Mason #include <linux/blkdev.h> 2187cbda5cSChris Mason #include <linux/scatterlist.h> 2222b0ebdaSChris Mason #include <linux/swap.h> 230f7d52f4SChris Mason #include <linux/radix-tree.h> 2435b7e476SChris Mason #include <linux/writeback.h> 255f39d397SChris Mason #include <linux/buffer_head.h> // for block_sync_page 26ce9adaa5SChris Mason #include <linux/workqueue.h> 27a5eb62e3SMiguel #include "crc32c.h" 28eb60ceacSChris Mason #include "ctree.h" 29eb60ceacSChris Mason #include "disk-io.h" 30e089f05cSChris Mason #include "transaction.h" 310f7d52f4SChris Mason #include "btrfs_inode.h" 320b86a832SChris Mason #include "volumes.h" 33db94535dSChris Mason #include "print-tree.h" 34eb60ceacSChris Mason 355f39d397SChris Mason #if 0 365f39d397SChris Mason static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) 377eccb903SChris Mason { 385f39d397SChris Mason if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) { 395f39d397SChris Mason printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n", 405f39d397SChris Mason (unsigned long long)extent_buffer_blocknr(buf), 415f39d397SChris Mason (unsigned long long)btrfs_header_blocknr(buf)); 4239279cc3SChris Mason return 1; 43d98237b3SChris Mason } 449a8dd150SChris Mason return 0; 45eb60ceacSChris Mason } 465f39d397SChris Mason #endif 47eb60ceacSChris Mason 48d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops; 49ce9adaa5SChris Mason static struct workqueue_struct *end_io_workqueue; 5044b8bd7eSChris Mason static struct workqueue_struct *async_submit_workqueue; 51ce9adaa5SChris Mason 52ce9adaa5SChris Mason struct end_io_wq { 53ce9adaa5SChris Mason struct bio *bio; 54ce9adaa5SChris Mason bio_end_io_t *end_io; 55ce9adaa5SChris Mason void *private; 56ce9adaa5SChris Mason struct btrfs_fs_info *info; 57ce9adaa5SChris Mason int error; 5822c59948SChris Mason int metadata; 59ce9adaa5SChris Mason struct list_head list; 60ce9adaa5SChris Mason }; 610da5468fSChris Mason 6244b8bd7eSChris Mason struct async_submit_bio { 6344b8bd7eSChris Mason struct inode *inode; 6444b8bd7eSChris Mason struct bio *bio; 6544b8bd7eSChris Mason struct list_head list; 6644b8bd7eSChris Mason extent_submit_bio_hook_t *submit_bio_hook; 6744b8bd7eSChris Mason int rw; 6844b8bd7eSChris Mason int mirror_num; 6944b8bd7eSChris Mason }; 7044b8bd7eSChris Mason 715f39d397SChris Mason struct extent_map *btree_get_extent(struct inode *inode, struct page *page, 72d1310b2eSChris Mason size_t page_offset, u64 start, u64 len, 735f39d397SChris Mason int create) 745f39d397SChris Mason { 755f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 765f39d397SChris Mason struct extent_map *em; 775f39d397SChris Mason int ret; 785f39d397SChris Mason 79d1310b2eSChris Mason spin_lock(&em_tree->lock); 80d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 81a061fc8dSChris Mason if (em) { 82a061fc8dSChris Mason em->bdev = 83a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 84d1310b2eSChris Mason spin_unlock(&em_tree->lock); 855f39d397SChris Mason goto out; 86a061fc8dSChris Mason } 87a061fc8dSChris Mason spin_unlock(&em_tree->lock); 887b13b7b1SChris Mason 895f39d397SChris Mason em = alloc_extent_map(GFP_NOFS); 905f39d397SChris Mason if (!em) { 915f39d397SChris Mason em = ERR_PTR(-ENOMEM); 925f39d397SChris Mason goto out; 935f39d397SChris Mason } 945f39d397SChris Mason em->start = 0; 950afbaf8cSChris Mason em->len = (u64)-1; 965f39d397SChris Mason em->block_start = 0; 97a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 98d1310b2eSChris Mason 99d1310b2eSChris Mason spin_lock(&em_tree->lock); 1005f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 1015f39d397SChris Mason if (ret == -EEXIST) { 1020afbaf8cSChris Mason u64 failed_start = em->start; 1030afbaf8cSChris Mason u64 failed_len = em->len; 1040afbaf8cSChris Mason 1050afbaf8cSChris Mason printk("failed to insert %Lu %Lu -> %Lu into tree\n", 1060afbaf8cSChris Mason em->start, em->len, em->block_start); 1075f39d397SChris Mason free_extent_map(em); 1087b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1090afbaf8cSChris Mason if (em) { 1100afbaf8cSChris Mason printk("after failing, found %Lu %Lu %Lu\n", 1110afbaf8cSChris Mason em->start, em->len, em->block_start); 1127b13b7b1SChris Mason ret = 0; 1130afbaf8cSChris Mason } else { 1140afbaf8cSChris Mason em = lookup_extent_mapping(em_tree, failed_start, 1150afbaf8cSChris Mason failed_len); 1160afbaf8cSChris Mason if (em) { 1170afbaf8cSChris Mason printk("double failure lookup gives us " 1180afbaf8cSChris Mason "%Lu %Lu -> %Lu\n", em->start, 1190afbaf8cSChris Mason em->len, em->block_start); 1200afbaf8cSChris Mason free_extent_map(em); 1210afbaf8cSChris Mason } 1227b13b7b1SChris Mason ret = -EIO; 1230afbaf8cSChris Mason } 1245f39d397SChris Mason } else if (ret) { 1257b13b7b1SChris Mason free_extent_map(em); 1267b13b7b1SChris Mason em = NULL; 1275f39d397SChris Mason } 1287b13b7b1SChris Mason spin_unlock(&em_tree->lock); 1297b13b7b1SChris Mason 1307b13b7b1SChris Mason if (ret) 1317b13b7b1SChris Mason em = ERR_PTR(ret); 1325f39d397SChris Mason out: 1335f39d397SChris Mason return em; 1345f39d397SChris Mason } 1355f39d397SChris Mason 13619c00ddcSChris Mason u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) 13719c00ddcSChris Mason { 138a5eb62e3SMiguel return btrfs_crc32c(seed, data, len); 13919c00ddcSChris Mason } 14019c00ddcSChris Mason 14119c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 14219c00ddcSChris Mason { 14319c00ddcSChris Mason *(__le32 *)result = ~cpu_to_le32(crc); 14419c00ddcSChris Mason } 14519c00ddcSChris Mason 14619c00ddcSChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 14719c00ddcSChris Mason int verify) 14819c00ddcSChris Mason { 14919c00ddcSChris Mason char result[BTRFS_CRC32_SIZE]; 15019c00ddcSChris Mason unsigned long len; 15119c00ddcSChris Mason unsigned long cur_len; 15219c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 15319c00ddcSChris Mason char *map_token = NULL; 15419c00ddcSChris Mason char *kaddr; 15519c00ddcSChris Mason unsigned long map_start; 15619c00ddcSChris Mason unsigned long map_len; 15719c00ddcSChris Mason int err; 15819c00ddcSChris Mason u32 crc = ~(u32)0; 15919c00ddcSChris Mason 16019c00ddcSChris Mason len = buf->len - offset; 16119c00ddcSChris Mason while(len > 0) { 16219c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 16319c00ddcSChris Mason &map_token, &kaddr, 16419c00ddcSChris Mason &map_start, &map_len, KM_USER0); 16519c00ddcSChris Mason if (err) { 16619c00ddcSChris Mason printk("failed to map extent buffer! %lu\n", 16719c00ddcSChris Mason offset); 16819c00ddcSChris Mason return 1; 16919c00ddcSChris Mason } 17019c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 17119c00ddcSChris Mason crc = btrfs_csum_data(root, kaddr + offset - map_start, 17219c00ddcSChris Mason crc, cur_len); 17319c00ddcSChris Mason len -= cur_len; 17419c00ddcSChris Mason offset += cur_len; 17519c00ddcSChris Mason unmap_extent_buffer(buf, map_token, KM_USER0); 17619c00ddcSChris Mason } 17719c00ddcSChris Mason btrfs_csum_final(crc, result); 17819c00ddcSChris Mason 17919c00ddcSChris Mason if (verify) { 180e4204dedSChris Mason int from_this_trans = 0; 181e4204dedSChris Mason 182e4204dedSChris Mason if (root->fs_info->running_transaction && 183e4204dedSChris Mason btrfs_header_generation(buf) == 184e4204dedSChris Mason root->fs_info->running_transaction->transid) 185e4204dedSChris Mason from_this_trans = 1; 186e4204dedSChris Mason 187e4204dedSChris Mason /* FIXME, this is not good */ 18863b10fc4SChris Mason if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) { 189e4204dedSChris Mason u32 val; 190e4204dedSChris Mason u32 found = 0; 191e4204dedSChris Mason memcpy(&found, result, BTRFS_CRC32_SIZE); 192e4204dedSChris Mason 193e4204dedSChris Mason read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE); 194e4204dedSChris Mason printk("btrfs: %s checksum verify failed on %llu " 19563b10fc4SChris Mason "wanted %X found %X from_this_trans %d " 19663b10fc4SChris Mason "level %d\n", 19719c00ddcSChris Mason root->fs_info->sb->s_id, 19863b10fc4SChris Mason buf->start, val, found, from_this_trans, 19963b10fc4SChris Mason btrfs_header_level(buf)); 20019c00ddcSChris Mason return 1; 20119c00ddcSChris Mason } 20219c00ddcSChris Mason } else { 20319c00ddcSChris Mason write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE); 20419c00ddcSChris Mason } 20519c00ddcSChris Mason return 0; 20619c00ddcSChris Mason } 20719c00ddcSChris Mason 208f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 209f188591eSChris Mason struct extent_buffer *eb, 210f188591eSChris Mason u64 start) 211f188591eSChris Mason { 212f188591eSChris Mason struct extent_io_tree *io_tree; 213f188591eSChris Mason int ret; 214f188591eSChris Mason int num_copies = 0; 215f188591eSChris Mason int mirror_num = 0; 216f188591eSChris Mason 217f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 218f188591eSChris Mason while (1) { 219f188591eSChris Mason ret = read_extent_buffer_pages(io_tree, eb, start, 1, 220f188591eSChris Mason btree_get_extent, mirror_num); 2214235298eSChris Mason if (!ret) 222f188591eSChris Mason return ret; 2234235298eSChris Mason 224f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 225f188591eSChris Mason eb->start, eb->len); 2264235298eSChris Mason if (num_copies == 1) 227f188591eSChris Mason return ret; 2284235298eSChris Mason 229f188591eSChris Mason mirror_num++; 2304235298eSChris Mason if (mirror_num > num_copies) 231f188591eSChris Mason return ret; 232f188591eSChris Mason } 233f188591eSChris Mason return -EIO; 234f188591eSChris Mason } 23519c00ddcSChris Mason 23619c00ddcSChris Mason int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 23719c00ddcSChris Mason { 238d1310b2eSChris Mason struct extent_io_tree *tree; 23935ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 24019c00ddcSChris Mason u64 found_start; 24119c00ddcSChris Mason int found_level; 24219c00ddcSChris Mason unsigned long len; 24319c00ddcSChris Mason struct extent_buffer *eb; 244f188591eSChris Mason int ret; 245f188591eSChris Mason 246d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 24719c00ddcSChris Mason 24819c00ddcSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 24919c00ddcSChris Mason goto out; 25019c00ddcSChris Mason if (!page->private) 25119c00ddcSChris Mason goto out; 25219c00ddcSChris Mason len = page->private >> 2; 25319c00ddcSChris Mason if (len == 0) { 25419c00ddcSChris Mason WARN_ON(1); 25519c00ddcSChris Mason } 25619c00ddcSChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 257f188591eSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE); 258f188591eSChris Mason BUG_ON(ret); 259e18e4809SChris Mason btrfs_clear_buffer_defrag(eb); 26019c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 26119c00ddcSChris Mason if (found_start != start) { 26219c00ddcSChris Mason printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n", 26319c00ddcSChris Mason start, found_start, len); 26455c69072SChris Mason WARN_ON(1); 26555c69072SChris Mason goto err; 26655c69072SChris Mason } 26755c69072SChris Mason if (eb->first_page != page) { 26855c69072SChris Mason printk("bad first page %lu %lu\n", eb->first_page->index, 26955c69072SChris Mason page->index); 27055c69072SChris Mason WARN_ON(1); 27155c69072SChris Mason goto err; 27255c69072SChris Mason } 27355c69072SChris Mason if (!PageUptodate(page)) { 27455c69072SChris Mason printk("csum not up to date page %lu\n", page->index); 27555c69072SChris Mason WARN_ON(1); 27655c69072SChris Mason goto err; 27719c00ddcSChris Mason } 27819c00ddcSChris Mason found_level = btrfs_header_level(eb); 27963b10fc4SChris Mason spin_lock(&root->fs_info->hash_lock); 28063b10fc4SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 28163b10fc4SChris Mason spin_unlock(&root->fs_info->hash_lock); 28219c00ddcSChris Mason csum_tree_block(root, eb, 0); 28355c69072SChris Mason err: 28419c00ddcSChris Mason free_extent_buffer(eb); 28519c00ddcSChris Mason out: 28619c00ddcSChris Mason return 0; 28719c00ddcSChris Mason } 28819c00ddcSChris Mason 2890da5468fSChris Mason static int btree_writepage_io_hook(struct page *page, u64 start, u64 end) 2900da5468fSChris Mason { 2910da5468fSChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 2920da5468fSChris Mason 2930da5468fSChris Mason csum_dirty_buffer(root, page); 2940da5468fSChris Mason return 0; 2950da5468fSChris Mason } 2960da5468fSChris Mason 297ce9adaa5SChris Mason int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 298ce9adaa5SChris Mason struct extent_state *state) 299ce9adaa5SChris Mason { 300ce9adaa5SChris Mason struct extent_io_tree *tree; 301ce9adaa5SChris Mason u64 found_start; 302ce9adaa5SChris Mason int found_level; 303ce9adaa5SChris Mason unsigned long len; 304ce9adaa5SChris Mason struct extent_buffer *eb; 305ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 306f188591eSChris Mason int ret = 0; 307ce9adaa5SChris Mason 308ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 309ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 310ce9adaa5SChris Mason goto out; 311ce9adaa5SChris Mason if (!page->private) 312ce9adaa5SChris Mason goto out; 313ce9adaa5SChris Mason len = page->private >> 2; 314ce9adaa5SChris Mason if (len == 0) { 315ce9adaa5SChris Mason WARN_ON(1); 316ce9adaa5SChris Mason } 317ce9adaa5SChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 318f188591eSChris Mason 319ce9adaa5SChris Mason btrfs_clear_buffer_defrag(eb); 320ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 321ce9adaa5SChris Mason if (found_start != start) { 322f188591eSChris Mason ret = -EIO; 323ce9adaa5SChris Mason goto err; 324ce9adaa5SChris Mason } 325ce9adaa5SChris Mason if (eb->first_page != page) { 326ce9adaa5SChris Mason printk("bad first page %lu %lu\n", eb->first_page->index, 327ce9adaa5SChris Mason page->index); 328ce9adaa5SChris Mason WARN_ON(1); 329f188591eSChris Mason ret = -EIO; 330ce9adaa5SChris Mason goto err; 331ce9adaa5SChris Mason } 332ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 333ce9adaa5SChris Mason 334ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 335f188591eSChris Mason if (ret) 336f188591eSChris Mason ret = -EIO; 337ce9adaa5SChris Mason 338ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 339ce9adaa5SChris Mason end = eb->start + end - 1; 340ce9adaa5SChris Mason release_extent_buffer_tail_pages(eb); 341ce9adaa5SChris Mason err: 342ce9adaa5SChris Mason free_extent_buffer(eb); 343ce9adaa5SChris Mason out: 344f188591eSChris Mason return ret; 345ce9adaa5SChris Mason } 346ce9adaa5SChris Mason 347ce9adaa5SChris Mason #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) 348ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 349ce9adaa5SChris Mason #else 350ce9adaa5SChris Mason static int end_workqueue_bio(struct bio *bio, 351ce9adaa5SChris Mason unsigned int bytes_done, int err) 352ce9adaa5SChris Mason #endif 353ce9adaa5SChris Mason { 354ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 355ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 356ce9adaa5SChris Mason unsigned long flags; 357ce9adaa5SChris Mason 358ce9adaa5SChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) 359ce9adaa5SChris Mason if (bio->bi_size) 360ce9adaa5SChris Mason return 1; 361ce9adaa5SChris Mason #endif 362ce9adaa5SChris Mason 363ce9adaa5SChris Mason fs_info = end_io_wq->info; 364ce9adaa5SChris Mason spin_lock_irqsave(&fs_info->end_io_work_lock, flags); 365ce9adaa5SChris Mason end_io_wq->error = err; 366ce9adaa5SChris Mason list_add_tail(&end_io_wq->list, &fs_info->end_io_work_list); 367ce9adaa5SChris Mason spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags); 368ce9adaa5SChris Mason queue_work(end_io_workqueue, &fs_info->end_io_work); 369ce9adaa5SChris Mason 370ce9adaa5SChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) 371ce9adaa5SChris Mason return 0; 372ce9adaa5SChris Mason #endif 373ce9adaa5SChris Mason } 374ce9adaa5SChris Mason 37522c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 37622c59948SChris Mason int metadata) 3770b86a832SChris Mason { 378ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 379ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 380ce9adaa5SChris Mason if (!end_io_wq) 381ce9adaa5SChris Mason return -ENOMEM; 382ce9adaa5SChris Mason 383ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 384ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 38522c59948SChris Mason end_io_wq->info = info; 386ce9adaa5SChris Mason end_io_wq->error = 0; 387ce9adaa5SChris Mason end_io_wq->bio = bio; 38822c59948SChris Mason end_io_wq->metadata = metadata; 389ce9adaa5SChris Mason 390ce9adaa5SChris Mason bio->bi_private = end_io_wq; 391ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 39222c59948SChris Mason return 0; 39322c59948SChris Mason } 39422c59948SChris Mason 39544b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 39644b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 39744b8bd7eSChris Mason extent_submit_bio_hook_t *submit_bio_hook) 39844b8bd7eSChris Mason { 39944b8bd7eSChris Mason struct async_submit_bio *async; 40044b8bd7eSChris Mason 4017b859fe7SChris Mason /* 4027b859fe7SChris Mason * inline writerback should stay inline, only hop to the async 4037b859fe7SChris Mason * queue if we're pdflush 4047b859fe7SChris Mason */ 4057b859fe7SChris Mason if (!current_is_pdflush()) 4067b859fe7SChris Mason return submit_bio_hook(inode, rw, bio, mirror_num); 4077b859fe7SChris Mason 40844b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 40944b8bd7eSChris Mason if (!async) 41044b8bd7eSChris Mason return -ENOMEM; 41144b8bd7eSChris Mason 41244b8bd7eSChris Mason async->inode = inode; 41344b8bd7eSChris Mason async->rw = rw; 41444b8bd7eSChris Mason async->bio = bio; 41544b8bd7eSChris Mason async->mirror_num = mirror_num; 41644b8bd7eSChris Mason async->submit_bio_hook = submit_bio_hook; 41744b8bd7eSChris Mason 41844b8bd7eSChris Mason spin_lock(&fs_info->async_submit_work_lock); 41944b8bd7eSChris Mason list_add_tail(&async->list, &fs_info->async_submit_work_list); 42044b8bd7eSChris Mason spin_unlock(&fs_info->async_submit_work_lock); 42144b8bd7eSChris Mason 42244b8bd7eSChris Mason queue_work(async_submit_workqueue, &fs_info->async_submit_work); 42344b8bd7eSChris Mason return 0; 42444b8bd7eSChris Mason } 42544b8bd7eSChris Mason 42644b8bd7eSChris Mason static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 427f188591eSChris Mason int mirror_num) 42822c59948SChris Mason { 42922c59948SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 43022c59948SChris Mason u64 offset; 43122c59948SChris Mason int ret; 43222c59948SChris Mason 43322c59948SChris Mason offset = bio->bi_sector << 9; 43422c59948SChris Mason 43522c59948SChris Mason if (rw & (1 << BIO_RW)) { 436f188591eSChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num); 43722c59948SChris Mason } 43822c59948SChris Mason 43922c59948SChris Mason ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1); 44022c59948SChris Mason BUG_ON(ret); 441ce9adaa5SChris Mason 442f188591eSChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num); 4430b86a832SChris Mason } 4440b86a832SChris Mason 44544b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 44644b8bd7eSChris Mason int mirror_num) 44744b8bd7eSChris Mason { 44844b8bd7eSChris Mason if (!(rw & (1 << BIO_RW))) { 44944b8bd7eSChris Mason return __btree_submit_bio_hook(inode, rw, bio, mirror_num); 45044b8bd7eSChris Mason } 45144b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 45244b8bd7eSChris Mason inode, rw, bio, mirror_num, 45344b8bd7eSChris Mason __btree_submit_bio_hook); 45444b8bd7eSChris Mason } 45544b8bd7eSChris Mason 4565f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 4575f39d397SChris Mason { 458d1310b2eSChris Mason struct extent_io_tree *tree; 459d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 4605f39d397SChris Mason return extent_write_full_page(tree, page, btree_get_extent, wbc); 4615f39d397SChris Mason } 4620da5468fSChris Mason 4630da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 4640da5468fSChris Mason struct writeback_control *wbc) 4650da5468fSChris Mason { 466d1310b2eSChris Mason struct extent_io_tree *tree; 467d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 468d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 469793955bcSChris Mason u64 num_dirty; 470793955bcSChris Mason u64 start = 0; 471793955bcSChris Mason unsigned long thresh = 96 * 1024 * 1024; 472448d640bSChris Mason 473448d640bSChris Mason if (wbc->for_kupdate) 474448d640bSChris Mason return 0; 475448d640bSChris Mason 476ca664626SChris Mason if (current_is_pdflush()) { 477ca664626SChris Mason thresh = 96 * 1024 * 1024; 478ca664626SChris Mason } else { 479ca664626SChris Mason thresh = 8 * 1024 * 1024; 480ca664626SChris Mason } 4811832a6d5SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 4821832a6d5SChris Mason thresh, EXTENT_DIRTY); 483793955bcSChris Mason if (num_dirty < thresh) { 484793955bcSChris Mason return 0; 485793955bcSChris Mason } 486793955bcSChris Mason } 4870da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 4880da5468fSChris Mason } 4890da5468fSChris Mason 4905f39d397SChris Mason int btree_readpage(struct file *file, struct page *page) 4915f39d397SChris Mason { 492d1310b2eSChris Mason struct extent_io_tree *tree; 493d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 4945f39d397SChris Mason return extent_read_full_page(tree, page, btree_get_extent); 4955f39d397SChris Mason } 4965f39d397SChris Mason 49770dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 4985f39d397SChris Mason { 499d1310b2eSChris Mason struct extent_io_tree *tree; 500d1310b2eSChris Mason struct extent_map_tree *map; 5015f39d397SChris Mason int ret; 5025f39d397SChris Mason 5033dd39914SChris Mason if (page_count(page) > 3) { 5043dd39914SChris Mason /* once for page->private, once for the caller, once 5053dd39914SChris Mason * once for the page cache 5063dd39914SChris Mason */ 5073dd39914SChris Mason return 0; 5083dd39914SChris Mason } 509d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 510d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 5117b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 5125f39d397SChris Mason if (ret == 1) { 513728131d8SChris Mason invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); 5145f39d397SChris Mason ClearPagePrivate(page); 5155f39d397SChris Mason set_page_private(page, 0); 516d98237b3SChris Mason page_cache_release(page); 5175f39d397SChris Mason } 518d98237b3SChris Mason return ret; 519d98237b3SChris Mason } 520d98237b3SChris Mason 5215f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 522d98237b3SChris Mason { 523d1310b2eSChris Mason struct extent_io_tree *tree; 524d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 5255f39d397SChris Mason extent_invalidatepage(tree, page, offset); 5265f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 5279ad6b7bcSChris Mason if (PagePrivate(page)) { 5284ef64eaeSChris Mason invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); 5299ad6b7bcSChris Mason ClearPagePrivate(page); 5309ad6b7bcSChris Mason set_page_private(page, 0); 5319ad6b7bcSChris Mason page_cache_release(page); 5329ad6b7bcSChris Mason } 533d98237b3SChris Mason } 534d98237b3SChris Mason 5355f39d397SChris Mason #if 0 536d98237b3SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 537d98237b3SChris Mason { 53887cbda5cSChris Mason struct buffer_head *bh; 5390f7d52f4SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 54087cbda5cSChris Mason struct buffer_head *head; 54187cbda5cSChris Mason if (!page_has_buffers(page)) { 54287cbda5cSChris Mason create_empty_buffers(page, root->fs_info->sb->s_blocksize, 54387cbda5cSChris Mason (1 << BH_Dirty)|(1 << BH_Uptodate)); 54487cbda5cSChris Mason } 54587cbda5cSChris Mason head = page_buffers(page); 54687cbda5cSChris Mason bh = head; 54787cbda5cSChris Mason do { 54887cbda5cSChris Mason if (buffer_dirty(bh)) 54987cbda5cSChris Mason csum_tree_block(root, bh, 0); 55087cbda5cSChris Mason bh = bh->b_this_page; 55187cbda5cSChris Mason } while (bh != head); 552d98237b3SChris Mason return block_write_full_page(page, btree_get_block, wbc); 553d98237b3SChris Mason } 5545f39d397SChris Mason #endif 555d98237b3SChris Mason 556d98237b3SChris Mason static struct address_space_operations btree_aops = { 557d98237b3SChris Mason .readpage = btree_readpage, 558d98237b3SChris Mason .writepage = btree_writepage, 5590da5468fSChris Mason .writepages = btree_writepages, 5605f39d397SChris Mason .releasepage = btree_releasepage, 5615f39d397SChris Mason .invalidatepage = btree_invalidatepage, 562d98237b3SChris Mason .sync_page = block_sync_page, 563d98237b3SChris Mason }; 564123abc88SChris Mason 565db94535dSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize) 566090d1875SChris Mason { 5675f39d397SChris Mason struct extent_buffer *buf = NULL; 5685f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 569de428b63SChris Mason int ret = 0; 570090d1875SChris Mason 571db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 5725f39d397SChris Mason if (!buf) 573090d1875SChris Mason return 0; 574d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 575f188591eSChris Mason buf, 0, 0, btree_get_extent, 0); 5765f39d397SChris Mason free_extent_buffer(buf); 577de428b63SChris Mason return ret; 578090d1875SChris Mason } 579090d1875SChris Mason 5800b86a832SChris Mason static int close_all_devices(struct btrfs_fs_info *fs_info) 5810b86a832SChris Mason { 5820b86a832SChris Mason struct list_head *list; 5830b86a832SChris Mason struct list_head *next; 5840b86a832SChris Mason struct btrfs_device *device; 5850b86a832SChris Mason 5868a4b83ccSChris Mason list = &fs_info->fs_devices->devices; 5878a4b83ccSChris Mason list_for_each(next, list) { 5880b86a832SChris Mason device = list_entry(next, struct btrfs_device, dev_list); 5898a4b83ccSChris Mason close_bdev_excl(device->bdev); 5908a4b83ccSChris Mason device->bdev = NULL; 5910b86a832SChris Mason } 5920b86a832SChris Mason return 0; 5930b86a832SChris Mason } 5940b86a832SChris Mason 5950999df54SChris Mason int btrfs_verify_block_csum(struct btrfs_root *root, 5960999df54SChris Mason struct extent_buffer *buf) 5970999df54SChris Mason { 598ce9adaa5SChris Mason return btrfs_buffer_uptodate(buf); 5990999df54SChris Mason } 6000999df54SChris Mason 6010999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 6020999df54SChris Mason u64 bytenr, u32 blocksize) 6030999df54SChris Mason { 6040999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 6050999df54SChris Mason struct extent_buffer *eb; 6060999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 6070999df54SChris Mason bytenr, blocksize, GFP_NOFS); 6080999df54SChris Mason return eb; 6090999df54SChris Mason } 6100999df54SChris Mason 6110999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 6120999df54SChris Mason u64 bytenr, u32 blocksize) 6130999df54SChris Mason { 6140999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 6150999df54SChris Mason struct extent_buffer *eb; 6160999df54SChris Mason 6170999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 6180999df54SChris Mason bytenr, blocksize, NULL, GFP_NOFS); 6190999df54SChris Mason return eb; 6200999df54SChris Mason } 6210999df54SChris Mason 6220999df54SChris Mason 623db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 624db94535dSChris Mason u32 blocksize) 625e20d96d6SChris Mason { 6265f39d397SChris Mason struct extent_buffer *buf = NULL; 6275f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 628d1310b2eSChris Mason struct extent_io_tree *io_tree; 62919c00ddcSChris Mason int ret; 63019c00ddcSChris Mason 631d1310b2eSChris Mason io_tree = &BTRFS_I(btree_inode)->io_tree; 632e20d96d6SChris Mason 633db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 6345f39d397SChris Mason if (!buf) 635d98237b3SChris Mason return NULL; 636e4204dedSChris Mason 637f188591eSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0); 638ce9adaa5SChris Mason 639ce9adaa5SChris Mason if (ret == 0) { 640ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 641ce9adaa5SChris Mason } 6425f39d397SChris Mason return buf; 643ce9adaa5SChris Mason 644eb60ceacSChris Mason } 645eb60ceacSChris Mason 646e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 6475f39d397SChris Mason struct extent_buffer *buf) 648ed2ff2cbSChris Mason { 6495f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 65055c69072SChris Mason if (btrfs_header_generation(buf) == 65155c69072SChris Mason root->fs_info->running_transaction->transid) 652d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 65355c69072SChris Mason buf); 6545f39d397SChris Mason return 0; 6555f39d397SChris Mason } 6565f39d397SChris Mason 6575f39d397SChris Mason int wait_on_tree_block_writeback(struct btrfs_root *root, 6585f39d397SChris Mason struct extent_buffer *buf) 6595f39d397SChris Mason { 6605f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 661d1310b2eSChris Mason wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree, 6625f39d397SChris Mason buf); 6635f39d397SChris Mason return 0; 6645f39d397SChris Mason } 6655f39d397SChris Mason 666db94535dSChris Mason static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 66787ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 6689f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 669e20d96d6SChris Mason u64 objectid) 670d97e63b6SChris Mason { 671cfaa7295SChris Mason root->node = NULL; 6720f7d52f4SChris Mason root->inode = NULL; 673a28ec197SChris Mason root->commit_root = NULL; 674db94535dSChris Mason root->sectorsize = sectorsize; 675db94535dSChris Mason root->nodesize = nodesize; 676db94535dSChris Mason root->leafsize = leafsize; 67787ee04ebSChris Mason root->stripesize = stripesize; 678123abc88SChris Mason root->ref_cows = 0; 6790b86a832SChris Mason root->track_dirty = 0; 6800b86a832SChris Mason 6819f5fae2fSChris Mason root->fs_info = fs_info; 6820f7d52f4SChris Mason root->objectid = objectid; 6830f7d52f4SChris Mason root->last_trans = 0; 6841b05da2eSChris Mason root->highest_inode = 0; 6851b05da2eSChris Mason root->last_inode_alloc = 0; 68658176a96SJosef Bacik root->name = NULL; 6874313b399SChris Mason root->in_sysfs = 0; 6880b86a832SChris Mason 6890b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 6903768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 6913768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 6926702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 69358176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 69458176a96SJosef Bacik init_completion(&root->kobj_unregister); 6956702ed49SChris Mason root->defrag_running = 0; 6966702ed49SChris Mason root->defrag_level = 0; 6974d775673SChris Mason root->root_key.objectid = objectid; 6983768f368SChris Mason return 0; 6993768f368SChris Mason } 7003768f368SChris Mason 701db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 7029f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 7039f5fae2fSChris Mason u64 objectid, 704e20d96d6SChris Mason struct btrfs_root *root) 7053768f368SChris Mason { 7063768f368SChris Mason int ret; 707db94535dSChris Mason u32 blocksize; 7083768f368SChris Mason 709db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 71087ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 71187ee04ebSChris Mason root, fs_info, objectid); 7123768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 7133768f368SChris Mason &root->root_item, &root->root_key); 7143768f368SChris Mason BUG_ON(ret); 7153768f368SChris Mason 716db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 717db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 718db94535dSChris Mason blocksize); 7193768f368SChris Mason BUG_ON(!root->node); 720d97e63b6SChris Mason return 0; 721d97e63b6SChris Mason } 722d97e63b6SChris Mason 7235eda7b5eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info, 7240f7d52f4SChris Mason struct btrfs_key *location) 7250f7d52f4SChris Mason { 7260f7d52f4SChris Mason struct btrfs_root *root; 7270f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 7280f7d52f4SChris Mason struct btrfs_path *path; 7295f39d397SChris Mason struct extent_buffer *l; 7301b05da2eSChris Mason u64 highest_inode; 731db94535dSChris Mason u32 blocksize; 7320f7d52f4SChris Mason int ret = 0; 7330f7d52f4SChris Mason 7345eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 7350cf6c620SChris Mason if (!root) 7360f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 7370f7d52f4SChris Mason if (location->offset == (u64)-1) { 738db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 7390f7d52f4SChris Mason location->objectid, root); 7400f7d52f4SChris Mason if (ret) { 7410f7d52f4SChris Mason kfree(root); 7420f7d52f4SChris Mason return ERR_PTR(ret); 7430f7d52f4SChris Mason } 7440f7d52f4SChris Mason goto insert; 7450f7d52f4SChris Mason } 7460f7d52f4SChris Mason 747db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 74887ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 74987ee04ebSChris Mason root, fs_info, location->objectid); 7500f7d52f4SChris Mason 7510f7d52f4SChris Mason path = btrfs_alloc_path(); 7520f7d52f4SChris Mason BUG_ON(!path); 7530f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 7540f7d52f4SChris Mason if (ret != 0) { 7550f7d52f4SChris Mason if (ret > 0) 7560f7d52f4SChris Mason ret = -ENOENT; 7570f7d52f4SChris Mason goto out; 7580f7d52f4SChris Mason } 7595f39d397SChris Mason l = path->nodes[0]; 7605f39d397SChris Mason read_extent_buffer(l, &root->root_item, 7615f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 7620f7d52f4SChris Mason sizeof(root->root_item)); 76344b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 7640f7d52f4SChris Mason ret = 0; 7650f7d52f4SChris Mason out: 7660f7d52f4SChris Mason btrfs_release_path(root, path); 7670f7d52f4SChris Mason btrfs_free_path(path); 7680f7d52f4SChris Mason if (ret) { 7690f7d52f4SChris Mason kfree(root); 7700f7d52f4SChris Mason return ERR_PTR(ret); 7710f7d52f4SChris Mason } 772db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 773db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 774db94535dSChris Mason blocksize); 7750f7d52f4SChris Mason BUG_ON(!root->node); 7760f7d52f4SChris Mason insert: 7770f7d52f4SChris Mason root->ref_cows = 1; 7785eda7b5eSChris Mason ret = btrfs_find_highest_inode(root, &highest_inode); 7795eda7b5eSChris Mason if (ret == 0) { 7805eda7b5eSChris Mason root->highest_inode = highest_inode; 7815eda7b5eSChris Mason root->last_inode_alloc = highest_inode; 7825eda7b5eSChris Mason } 7835eda7b5eSChris Mason return root; 7845eda7b5eSChris Mason } 7855eda7b5eSChris Mason 786dc17ff8fSChris Mason struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 787dc17ff8fSChris Mason u64 root_objectid) 788dc17ff8fSChris Mason { 789dc17ff8fSChris Mason struct btrfs_root *root; 790dc17ff8fSChris Mason 791dc17ff8fSChris Mason if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) 792dc17ff8fSChris Mason return fs_info->tree_root; 793dc17ff8fSChris Mason if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) 794dc17ff8fSChris Mason return fs_info->extent_root; 795dc17ff8fSChris Mason 796dc17ff8fSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 797dc17ff8fSChris Mason (unsigned long)root_objectid); 798dc17ff8fSChris Mason return root; 799dc17ff8fSChris Mason } 800dc17ff8fSChris Mason 801edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 802edbd8d4eSChris Mason struct btrfs_key *location) 8035eda7b5eSChris Mason { 8045eda7b5eSChris Mason struct btrfs_root *root; 8055eda7b5eSChris Mason int ret; 8065eda7b5eSChris Mason 807edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 808edbd8d4eSChris Mason return fs_info->tree_root; 809edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 810edbd8d4eSChris Mason return fs_info->extent_root; 8118f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 8128f18cf13SChris Mason return fs_info->chunk_root; 8138f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 8148f18cf13SChris Mason return fs_info->dev_root; 815edbd8d4eSChris Mason 8165eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 8175eda7b5eSChris Mason (unsigned long)location->objectid); 8185eda7b5eSChris Mason if (root) 8195eda7b5eSChris Mason return root; 8205eda7b5eSChris Mason 8215eda7b5eSChris Mason root = btrfs_read_fs_root_no_radix(fs_info, location); 8225eda7b5eSChris Mason if (IS_ERR(root)) 8235eda7b5eSChris Mason return root; 8242619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 8252619ba1fSChris Mason (unsigned long)root->root_key.objectid, 8260f7d52f4SChris Mason root); 8270f7d52f4SChris Mason if (ret) { 8285f39d397SChris Mason free_extent_buffer(root->node); 8290f7d52f4SChris Mason kfree(root); 8300f7d52f4SChris Mason return ERR_PTR(ret); 8310f7d52f4SChris Mason } 832edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 833edbd8d4eSChris Mason root->root_key.objectid, root); 834edbd8d4eSChris Mason BUG_ON(ret); 835edbd8d4eSChris Mason 836edbd8d4eSChris Mason return root; 837edbd8d4eSChris Mason } 838edbd8d4eSChris Mason 839edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 840edbd8d4eSChris Mason struct btrfs_key *location, 841edbd8d4eSChris Mason const char *name, int namelen) 842edbd8d4eSChris Mason { 843edbd8d4eSChris Mason struct btrfs_root *root; 844edbd8d4eSChris Mason int ret; 845edbd8d4eSChris Mason 846edbd8d4eSChris Mason root = btrfs_read_fs_root_no_name(fs_info, location); 847edbd8d4eSChris Mason if (!root) 848edbd8d4eSChris Mason return NULL; 84958176a96SJosef Bacik 8504313b399SChris Mason if (root->in_sysfs) 8514313b399SChris Mason return root; 8524313b399SChris Mason 85358176a96SJosef Bacik ret = btrfs_set_root_name(root, name, namelen); 85458176a96SJosef Bacik if (ret) { 8555f39d397SChris Mason free_extent_buffer(root->node); 85658176a96SJosef Bacik kfree(root); 85758176a96SJosef Bacik return ERR_PTR(ret); 85858176a96SJosef Bacik } 85958176a96SJosef Bacik 86058176a96SJosef Bacik ret = btrfs_sysfs_add_root(root); 86158176a96SJosef Bacik if (ret) { 8625f39d397SChris Mason free_extent_buffer(root->node); 86358176a96SJosef Bacik kfree(root->name); 86458176a96SJosef Bacik kfree(root); 86558176a96SJosef Bacik return ERR_PTR(ret); 86658176a96SJosef Bacik } 8674313b399SChris Mason root->in_sysfs = 1; 8680f7d52f4SChris Mason return root; 8690f7d52f4SChris Mason } 87019c00ddcSChris Mason #if 0 87119c00ddcSChris Mason static int add_hasher(struct btrfs_fs_info *info, char *type) { 87219c00ddcSChris Mason struct btrfs_hasher *hasher; 8730f7d52f4SChris Mason 87419c00ddcSChris Mason hasher = kmalloc(sizeof(*hasher), GFP_NOFS); 87519c00ddcSChris Mason if (!hasher) 87619c00ddcSChris Mason return -ENOMEM; 87719c00ddcSChris Mason hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC); 87819c00ddcSChris Mason if (!hasher->hash_tfm) { 87919c00ddcSChris Mason kfree(hasher); 88019c00ddcSChris Mason return -EINVAL; 88119c00ddcSChris Mason } 88219c00ddcSChris Mason spin_lock(&info->hash_lock); 88319c00ddcSChris Mason list_add(&hasher->list, &info->hashers); 88419c00ddcSChris Mason spin_unlock(&info->hash_lock); 88519c00ddcSChris Mason return 0; 88619c00ddcSChris Mason } 88719c00ddcSChris Mason #endif 88804160088SChris Mason 88904160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 89004160088SChris Mason { 89104160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 89204160088SChris Mason int ret = 0; 89304160088SChris Mason struct list_head *cur; 89404160088SChris Mason struct btrfs_device *device; 89504160088SChris Mason struct backing_dev_info *bdi; 89604160088SChris Mason 89704160088SChris Mason list_for_each(cur, &info->fs_devices->devices) { 89804160088SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 89904160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 90004160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 90104160088SChris Mason ret = 1; 90204160088SChris Mason break; 90304160088SChris Mason } 90404160088SChris Mason } 90504160088SChris Mason return ret; 90604160088SChris Mason } 90704160088SChris Mason 90838b66988SChris Mason /* 90938b66988SChris Mason * this unplugs every device on the box, and it is only used when page 91038b66988SChris Mason * is null 91138b66988SChris Mason */ 91238b66988SChris Mason static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 91338b66988SChris Mason { 91438b66988SChris Mason struct list_head *cur; 91538b66988SChris Mason struct btrfs_device *device; 91638b66988SChris Mason struct btrfs_fs_info *info; 91738b66988SChris Mason 91838b66988SChris Mason info = (struct btrfs_fs_info *)bdi->unplug_io_data; 91938b66988SChris Mason list_for_each(cur, &info->fs_devices->devices) { 92038b66988SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 92138b66988SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 92238b66988SChris Mason if (bdi->unplug_io_fn) { 92338b66988SChris Mason bdi->unplug_io_fn(bdi, page); 92438b66988SChris Mason } 92538b66988SChris Mason } 92638b66988SChris Mason } 92738b66988SChris Mason 92804160088SChris Mason void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 92904160088SChris Mason { 93038b66988SChris Mason struct inode *inode; 931f2d8d74dSChris Mason struct extent_map_tree *em_tree; 932f2d8d74dSChris Mason struct extent_map *em; 933bcbfce8aSChris Mason struct address_space *mapping; 93438b66988SChris Mason u64 offset; 93538b66988SChris Mason 936bcbfce8aSChris Mason /* the generic O_DIRECT read code does this */ 93738b66988SChris Mason if (!page) { 93838b66988SChris Mason __unplug_io_fn(bdi, page); 93938b66988SChris Mason return; 94038b66988SChris Mason } 94138b66988SChris Mason 942bcbfce8aSChris Mason /* 943bcbfce8aSChris Mason * page->mapping may change at any time. Get a consistent copy 944bcbfce8aSChris Mason * and use that for everything below 945bcbfce8aSChris Mason */ 946bcbfce8aSChris Mason smp_mb(); 947bcbfce8aSChris Mason mapping = page->mapping; 948bcbfce8aSChris Mason if (!mapping) 949bcbfce8aSChris Mason return; 950bcbfce8aSChris Mason 951bcbfce8aSChris Mason inode = mapping->host; 95238b66988SChris Mason offset = page_offset(page); 95304160088SChris Mason 954f2d8d74dSChris Mason em_tree = &BTRFS_I(inode)->extent_tree; 955f2d8d74dSChris Mason spin_lock(&em_tree->lock); 956f2d8d74dSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 957f2d8d74dSChris Mason spin_unlock(&em_tree->lock); 958f2d8d74dSChris Mason if (!em) 959f2d8d74dSChris Mason return; 960f2d8d74dSChris Mason 961f2d8d74dSChris Mason offset = offset - em->start; 962f2d8d74dSChris Mason btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, 963f2d8d74dSChris Mason em->block_start + offset, page); 964f2d8d74dSChris Mason free_extent_map(em); 96504160088SChris Mason } 96604160088SChris Mason 96704160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 96804160088SChris Mason { 969b248a415SChris Mason #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) 97004160088SChris Mason bdi_init(bdi); 971b248a415SChris Mason #endif 9724575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 97304160088SChris Mason bdi->state = 0; 97404160088SChris Mason bdi->capabilities = default_backing_dev_info.capabilities; 97504160088SChris Mason bdi->unplug_io_fn = btrfs_unplug_io_fn; 97604160088SChris Mason bdi->unplug_io_data = info; 97704160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 97804160088SChris Mason bdi->congested_data = info; 97904160088SChris Mason return 0; 98004160088SChris Mason } 98104160088SChris Mason 982ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 983ce9adaa5SChris Mason { 984ce9adaa5SChris Mason u64 length = 0; 985ce9adaa5SChris Mason u64 buf_len = 0; 986ce9adaa5SChris Mason u64 start = 0; 987ce9adaa5SChris Mason struct page *page; 988ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 989ce9adaa5SChris Mason struct btrfs_fs_info *info = NULL; 990ce9adaa5SChris Mason struct bio_vec *bvec; 991ce9adaa5SChris Mason int i; 992ce9adaa5SChris Mason int ret; 993ce9adaa5SChris Mason 994ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 995ce9adaa5SChris Mason page = bvec->bv_page; 996ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 997ce9adaa5SChris Mason length += bvec->bv_len; 998ce9adaa5SChris Mason continue; 999ce9adaa5SChris Mason } 1000ce9adaa5SChris Mason if (!page->private) { 1001ce9adaa5SChris Mason length += bvec->bv_len; 1002ce9adaa5SChris Mason continue; 1003ce9adaa5SChris Mason } 1004ce9adaa5SChris Mason length = bvec->bv_len; 1005ce9adaa5SChris Mason buf_len = page->private >> 2; 1006ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1007ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1008ce9adaa5SChris Mason info = BTRFS_I(page->mapping->host)->root->fs_info; 1009ce9adaa5SChris Mason } 1010ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1011ce9adaa5SChris Mason if (buf_len <= length) 1012ce9adaa5SChris Mason return 1; 1013ce9adaa5SChris Mason 1014ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1015ce9adaa5SChris Mason start + buf_len - 1); 1016ce9adaa5SChris Mason if (ret == 1) 1017ce9adaa5SChris Mason return ret; 1018ce9adaa5SChris Mason return ret; 1019ce9adaa5SChris Mason } 1020ce9adaa5SChris Mason 1021ce9adaa5SChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 102244b8bd7eSChris Mason static void btrfs_end_io_csum(void *p) 1023ce9adaa5SChris Mason #else 102444b8bd7eSChris Mason static void btrfs_end_io_csum(struct work_struct *work) 1025ce9adaa5SChris Mason #endif 1026ce9adaa5SChris Mason { 1027ce9adaa5SChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 1028ce9adaa5SChris Mason struct btrfs_fs_info *fs_info = p; 1029ce9adaa5SChris Mason #else 1030ce9adaa5SChris Mason struct btrfs_fs_info *fs_info = container_of(work, 1031ce9adaa5SChris Mason struct btrfs_fs_info, 1032ce9adaa5SChris Mason end_io_work); 1033ce9adaa5SChris Mason #endif 1034ce9adaa5SChris Mason unsigned long flags; 1035ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 1036ce9adaa5SChris Mason struct bio *bio; 1037ce9adaa5SChris Mason struct list_head *next; 1038ce9adaa5SChris Mason int error; 1039ce9adaa5SChris Mason int was_empty; 1040ce9adaa5SChris Mason 1041ce9adaa5SChris Mason while(1) { 1042ce9adaa5SChris Mason spin_lock_irqsave(&fs_info->end_io_work_lock, flags); 1043ce9adaa5SChris Mason if (list_empty(&fs_info->end_io_work_list)) { 1044ce9adaa5SChris Mason spin_unlock_irqrestore(&fs_info->end_io_work_lock, 1045ce9adaa5SChris Mason flags); 1046ce9adaa5SChris Mason return; 1047ce9adaa5SChris Mason } 1048ce9adaa5SChris Mason next = fs_info->end_io_work_list.next; 1049ce9adaa5SChris Mason list_del(next); 1050ce9adaa5SChris Mason spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags); 1051ce9adaa5SChris Mason 1052ce9adaa5SChris Mason end_io_wq = list_entry(next, struct end_io_wq, list); 1053ce9adaa5SChris Mason 1054ce9adaa5SChris Mason bio = end_io_wq->bio; 105522c59948SChris Mason if (end_io_wq->metadata && !bio_ready_for_csum(bio)) { 1056ce9adaa5SChris Mason spin_lock_irqsave(&fs_info->end_io_work_lock, flags); 1057ce9adaa5SChris Mason was_empty = list_empty(&fs_info->end_io_work_list); 1058ce9adaa5SChris Mason list_add_tail(&end_io_wq->list, 1059ce9adaa5SChris Mason &fs_info->end_io_work_list); 1060ce9adaa5SChris Mason spin_unlock_irqrestore(&fs_info->end_io_work_lock, 1061ce9adaa5SChris Mason flags); 1062ce9adaa5SChris Mason if (was_empty) 1063ce9adaa5SChris Mason return; 1064ce9adaa5SChris Mason continue; 1065ce9adaa5SChris Mason } 1066ce9adaa5SChris Mason error = end_io_wq->error; 1067ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1068ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1069ce9adaa5SChris Mason kfree(end_io_wq); 107073f61b2aSMiguel #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) 1071b248a415SChris Mason bio_endio(bio, bio->bi_size, error); 107273f61b2aSMiguel #else 1073ce9adaa5SChris Mason bio_endio(bio, error); 107473f61b2aSMiguel #endif 1075ce9adaa5SChris Mason } 1076ce9adaa5SChris Mason } 1077ce9adaa5SChris Mason 107844b8bd7eSChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 107944b8bd7eSChris Mason static void btrfs_async_submit_work(void *p) 108044b8bd7eSChris Mason #else 108144b8bd7eSChris Mason static void btrfs_async_submit_work(struct work_struct *work) 108244b8bd7eSChris Mason #endif 108344b8bd7eSChris Mason { 108444b8bd7eSChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 108544b8bd7eSChris Mason struct btrfs_fs_info *fs_info = p; 108644b8bd7eSChris Mason #else 108744b8bd7eSChris Mason struct btrfs_fs_info *fs_info = container_of(work, 108844b8bd7eSChris Mason struct btrfs_fs_info, 108944b8bd7eSChris Mason async_submit_work); 109044b8bd7eSChris Mason #endif 109144b8bd7eSChris Mason struct async_submit_bio *async; 109244b8bd7eSChris Mason struct list_head *next; 109344b8bd7eSChris Mason 109444b8bd7eSChris Mason while(1) { 109544b8bd7eSChris Mason spin_lock(&fs_info->async_submit_work_lock); 109644b8bd7eSChris Mason if (list_empty(&fs_info->async_submit_work_list)) { 109744b8bd7eSChris Mason spin_unlock(&fs_info->async_submit_work_lock); 109844b8bd7eSChris Mason return; 109944b8bd7eSChris Mason } 110044b8bd7eSChris Mason next = fs_info->async_submit_work_list.next; 110144b8bd7eSChris Mason list_del(next); 110244b8bd7eSChris Mason spin_unlock(&fs_info->async_submit_work_lock); 110344b8bd7eSChris Mason 110444b8bd7eSChris Mason async = list_entry(next, struct async_submit_bio, list); 110544b8bd7eSChris Mason async->submit_bio_hook(async->inode, async->rw, async->bio, 110644b8bd7eSChris Mason async->mirror_num); 110744b8bd7eSChris Mason kfree(async); 110844b8bd7eSChris Mason } 110944b8bd7eSChris Mason } 111044b8bd7eSChris Mason 11118a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 11128a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices) 1113eb60ceacSChris Mason { 1114db94535dSChris Mason u32 sectorsize; 1115db94535dSChris Mason u32 nodesize; 1116db94535dSChris Mason u32 leafsize; 1117db94535dSChris Mason u32 blocksize; 111887ee04ebSChris Mason u32 stripesize; 1119a061fc8dSChris Mason struct buffer_head *bh; 1120e20d96d6SChris Mason struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), 1121e20d96d6SChris Mason GFP_NOFS); 1122e20d96d6SChris Mason struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), 1123e20d96d6SChris Mason GFP_NOFS); 11248790d502SChris Mason struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), 1125e20d96d6SChris Mason GFP_NOFS); 11260b86a832SChris Mason struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root), 11270b86a832SChris Mason GFP_NOFS); 11280b86a832SChris Mason struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root), 11290b86a832SChris Mason GFP_NOFS); 1130eb60ceacSChris Mason int ret; 1131e58ca020SYan int err = -EINVAL; 11322c90e5d6SChris Mason struct btrfs_super_block *disk_super; 11338790d502SChris Mason 113439279cc3SChris Mason if (!extent_root || !tree_root || !fs_info) { 113539279cc3SChris Mason err = -ENOMEM; 113639279cc3SChris Mason goto fail; 113739279cc3SChris Mason } 1138ce9adaa5SChris Mason end_io_workqueue = create_workqueue("btrfs-end-io"); 1139ce9adaa5SChris Mason BUG_ON(!end_io_workqueue); 114044b8bd7eSChris Mason async_submit_workqueue = create_workqueue("btrfs-async-submit"); 1141ce9adaa5SChris Mason 11420f7d52f4SChris Mason INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); 11438fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1144facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 114519c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1146ce9adaa5SChris Mason INIT_LIST_HEAD(&fs_info->end_io_work_list); 114744b8bd7eSChris Mason INIT_LIST_HEAD(&fs_info->async_submit_work_list); 114819c00ddcSChris Mason spin_lock_init(&fs_info->hash_lock); 1149ce9adaa5SChris Mason spin_lock_init(&fs_info->end_io_work_lock); 115044b8bd7eSChris Mason spin_lock_init(&fs_info->async_submit_work_lock); 11511832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1152cee36a03SChris Mason spin_lock_init(&fs_info->new_trans_lock); 115319c00ddcSChris Mason 115458176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 11559f5fae2fSChris Mason fs_info->tree_root = tree_root; 11569f5fae2fSChris Mason fs_info->extent_root = extent_root; 11570b86a832SChris Mason fs_info->chunk_root = chunk_root; 11580b86a832SChris Mason fs_info->dev_root = dev_root; 11598a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 11600b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 11616324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 11620b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1163e20d96d6SChris Mason fs_info->sb = sb; 1164c59f8951SChris Mason fs_info->max_extent = (u64)-1; 11656f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 116604160088SChris Mason setup_bdi(fs_info, &fs_info->bdi); 1167d98237b3SChris Mason fs_info->btree_inode = new_inode(sb); 1168d98237b3SChris Mason fs_info->btree_inode->i_ino = 1; 11692c90e5d6SChris Mason fs_info->btree_inode->i_nlink = 1; 11700afbaf8cSChris Mason 1171a061fc8dSChris Mason sb->s_blocksize = 4096; 1172a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 1173a061fc8dSChris Mason 11740afbaf8cSChris Mason /* 11750afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 11760afbaf8cSChris Mason * the real end of the address space is determined by all of 11770afbaf8cSChris Mason * the devices in the system 11780afbaf8cSChris Mason */ 11790afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 1180d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 118104160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 118204160088SChris Mason 1183d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 11845f39d397SChris Mason fs_info->btree_inode->i_mapping, 11855f39d397SChris Mason GFP_NOFS); 1186d1310b2eSChris Mason extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, 1187d1310b2eSChris Mason GFP_NOFS); 11880da5468fSChris Mason 1189d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 1190d1310b2eSChris Mason 1191d1310b2eSChris Mason extent_io_tree_init(&fs_info->free_space_cache, 1192f510cfecSChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1193d1310b2eSChris Mason extent_io_tree_init(&fs_info->block_group_cache, 119496b5179dSChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1195d1310b2eSChris Mason extent_io_tree_init(&fs_info->pinned_extents, 11961a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1197d1310b2eSChris Mason extent_io_tree_init(&fs_info->pending_del, 11981a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1199d1310b2eSChris Mason extent_io_tree_init(&fs_info->extent_ins, 12001a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1201e66f709bSChris Mason fs_info->do_barriers = 1; 1202e18e4809SChris Mason 12036da6abaeSChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 1204b248a415SChris Mason INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum, fs_info); 120544b8bd7eSChris Mason INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work, 120644b8bd7eSChris Mason fs_info); 12076da6abaeSChris Mason INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info); 12086da6abaeSChris Mason #else 1209b248a415SChris Mason INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum); 121044b8bd7eSChris Mason INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work); 121108607c1bSChris Mason INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner); 12126da6abaeSChris Mason #endif 12130f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 12140f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 12150f7d52f4SChris Mason sizeof(struct btrfs_key)); 121622b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 1217d98237b3SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 121839279cc3SChris Mason 121979154b1bSChris Mason mutex_init(&fs_info->trans_mutex); 1220d561c025SChris Mason mutex_init(&fs_info->fs_mutex); 12213768f368SChris Mason 122219c00ddcSChris Mason #if 0 122319c00ddcSChris Mason ret = add_hasher(fs_info, "crc32c"); 122419c00ddcSChris Mason if (ret) { 122519c00ddcSChris Mason printk("btrfs: failed hash setup, modprobe cryptomgr?\n"); 122619c00ddcSChris Mason err = -ENOMEM; 122719c00ddcSChris Mason goto fail_iput; 122819c00ddcSChris Mason } 122919c00ddcSChris Mason #endif 12300b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 12312c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 12327eccb903SChris Mason 1233d98237b3SChris Mason 1234a061fc8dSChris Mason bh = __bread(fs_devices->latest_bdev, 1235a061fc8dSChris Mason BTRFS_SUPER_INFO_OFFSET / 4096, 4096); 1236a061fc8dSChris Mason if (!bh) 123739279cc3SChris Mason goto fail_iput; 123839279cc3SChris Mason 1239a061fc8dSChris Mason memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); 1240a061fc8dSChris Mason brelse(bh); 12415f39d397SChris Mason 1242a061fc8dSChris Mason memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); 12430b86a832SChris Mason 12445f39d397SChris Mason disk_super = &fs_info->super_copy; 12450f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 124639279cc3SChris Mason goto fail_sb_buffer; 12470f7d52f4SChris Mason 12488a4b83ccSChris Mason if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) { 12498a4b83ccSChris Mason printk("Btrfs: wanted %llu devices, but found %llu\n", 12508a4b83ccSChris Mason (unsigned long long)btrfs_super_num_devices(disk_super), 12518a4b83ccSChris Mason (unsigned long long)fs_devices->num_devices); 12528a4b83ccSChris Mason goto fail_sb_buffer; 12538a4b83ccSChris Mason } 12544575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 12554575c9ccSChris Mason 1256db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 1257db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 1258db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 125987ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 1260db94535dSChris Mason tree_root->nodesize = nodesize; 1261db94535dSChris Mason tree_root->leafsize = leafsize; 1262db94535dSChris Mason tree_root->sectorsize = sectorsize; 126387ee04ebSChris Mason tree_root->stripesize = stripesize; 1264a061fc8dSChris Mason 1265a061fc8dSChris Mason sb->s_blocksize = sectorsize; 1266a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 1267db94535dSChris Mason 126839279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 126939279cc3SChris Mason sizeof(disk_super->magic))) { 127039279cc3SChris Mason printk("btrfs: valid FS not found on %s\n", sb->s_id); 127139279cc3SChris Mason goto fail_sb_buffer; 127239279cc3SChris Mason } 127319c00ddcSChris Mason 12740b86a832SChris Mason mutex_lock(&fs_info->fs_mutex); 12750d81ba5dSChris Mason 12760b86a832SChris Mason ret = btrfs_read_sys_array(tree_root); 127784eed90fSChris Mason if (ret) { 127884eed90fSChris Mason printk("btrfs: failed to read the system array on %s\n", 127984eed90fSChris Mason sb->s_id); 128084eed90fSChris Mason goto fail_sys_array; 128184eed90fSChris Mason } 12820b86a832SChris Mason 12830b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 12840b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 12850b86a832SChris Mason 12860b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 12870b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 12880b86a832SChris Mason 12890b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 12900b86a832SChris Mason btrfs_super_chunk_root(disk_super), 12910b86a832SChris Mason blocksize); 12920b86a832SChris Mason BUG_ON(!chunk_root->node); 12930b86a832SChris Mason 1294e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 1295e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 1296e17cade2SChris Mason BTRFS_UUID_SIZE); 1297e17cade2SChris Mason 12980b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 12990b86a832SChris Mason BUG_ON(ret); 13000b86a832SChris Mason 1301db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 1302db94535dSChris Mason btrfs_super_root_level(disk_super)); 130319c00ddcSChris Mason 13040b86a832SChris Mason 1305e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 1306db94535dSChris Mason btrfs_super_root(disk_super), 1307db94535dSChris Mason blocksize); 130839279cc3SChris Mason if (!tree_root->node) 130939279cc3SChris Mason goto fail_sb_buffer; 13103768f368SChris Mason 1311db94535dSChris Mason 1312db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 1313e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 13140b86a832SChris Mason if (ret) 131539279cc3SChris Mason goto fail_tree_root; 13160b86a832SChris Mason extent_root->track_dirty = 1; 13170b86a832SChris Mason 13180b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 13190b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 13200b86a832SChris Mason dev_root->track_dirty = 1; 13210b86a832SChris Mason 13220b86a832SChris Mason if (ret) 13230b86a832SChris Mason goto fail_extent_root; 13243768f368SChris Mason 13259078a3e1SChris Mason btrfs_read_block_groups(extent_root); 13269078a3e1SChris Mason 13270f7d52f4SChris Mason fs_info->generation = btrfs_super_generation(disk_super) + 1; 1328d18a2c44SChris Mason fs_info->data_alloc_profile = (u64)-1; 1329d18a2c44SChris Mason fs_info->metadata_alloc_profile = (u64)-1; 1330611f0e00SChris Mason fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 1331d18a2c44SChris Mason 13325be6f7f1SChris Mason mutex_unlock(&fs_info->fs_mutex); 13330f7d52f4SChris Mason return tree_root; 133439279cc3SChris Mason 13350b86a832SChris Mason fail_extent_root: 13360b86a832SChris Mason free_extent_buffer(extent_root->node); 133739279cc3SChris Mason fail_tree_root: 13385f39d397SChris Mason free_extent_buffer(tree_root->node); 133984eed90fSChris Mason fail_sys_array: 134084eed90fSChris Mason mutex_unlock(&fs_info->fs_mutex); 134139279cc3SChris Mason fail_sb_buffer: 13422d2ae547SChris Mason extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree); 134339279cc3SChris Mason fail_iput: 134439279cc3SChris Mason iput(fs_info->btree_inode); 134539279cc3SChris Mason fail: 13468a4b83ccSChris Mason close_all_devices(fs_info); 134784eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 134884eed90fSChris Mason 134939279cc3SChris Mason kfree(extent_root); 135039279cc3SChris Mason kfree(tree_root); 1351b248a415SChris Mason #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) 13522d2ae547SChris Mason bdi_destroy(&fs_info->bdi); 1353b248a415SChris Mason #endif 135439279cc3SChris Mason kfree(fs_info); 135539279cc3SChris Mason return ERR_PTR(err); 1356eb60ceacSChris Mason } 1357eb60ceacSChris Mason 1358f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 1359f2984462SChris Mason { 1360f2984462SChris Mason char b[BDEVNAME_SIZE]; 1361f2984462SChris Mason 1362f2984462SChris Mason if (uptodate) { 1363f2984462SChris Mason set_buffer_uptodate(bh); 1364f2984462SChris Mason } else { 1365f2984462SChris Mason if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { 1366f2984462SChris Mason printk(KERN_WARNING "lost page write due to " 1367f2984462SChris Mason "I/O error on %s\n", 1368f2984462SChris Mason bdevname(bh->b_bdev, b)); 1369f2984462SChris Mason } 1370f2984462SChris Mason set_buffer_write_io_error(bh); 1371f2984462SChris Mason clear_buffer_uptodate(bh); 1372f2984462SChris Mason } 1373f2984462SChris Mason unlock_buffer(bh); 1374f2984462SChris Mason put_bh(bh); 1375f2984462SChris Mason } 1376f2984462SChris Mason 1377f2984462SChris Mason int write_all_supers(struct btrfs_root *root) 1378f2984462SChris Mason { 1379f2984462SChris Mason struct list_head *cur; 1380f2984462SChris Mason struct list_head *head = &root->fs_info->fs_devices->devices; 1381f2984462SChris Mason struct btrfs_device *dev; 1382a061fc8dSChris Mason struct btrfs_super_block *sb; 1383f2984462SChris Mason struct btrfs_dev_item *dev_item; 1384f2984462SChris Mason struct buffer_head *bh; 1385f2984462SChris Mason int ret; 1386f2984462SChris Mason int do_barriers; 1387a236aed1SChris Mason int max_errors; 1388a236aed1SChris Mason int total_errors = 0; 1389a061fc8dSChris Mason u32 crc; 1390a061fc8dSChris Mason u64 flags; 1391f2984462SChris Mason 1392a236aed1SChris Mason max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; 1393f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 1394f2984462SChris Mason 1395a061fc8dSChris Mason sb = &root->fs_info->super_for_commit; 1396a061fc8dSChris Mason dev_item = &sb->dev_item; 1397f2984462SChris Mason list_for_each(cur, head) { 1398f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1399a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 1400a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 1401a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 1402a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 1403a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 1404a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 1405a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 1406a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 1407a061fc8dSChris Mason flags = btrfs_super_flags(sb); 1408a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 1409f2984462SChris Mason 1410f2984462SChris Mason 1411a061fc8dSChris Mason crc = ~(u32)0; 1412a061fc8dSChris Mason crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc, 1413a061fc8dSChris Mason BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); 1414a061fc8dSChris Mason btrfs_csum_final(crc, sb->csum); 1415a061fc8dSChris Mason 1416a061fc8dSChris Mason bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 1417f2984462SChris Mason BTRFS_SUPER_INFO_SIZE); 1418f2984462SChris Mason 1419a061fc8dSChris Mason memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 1420f2984462SChris Mason dev->pending_io = bh; 1421f2984462SChris Mason 1422f2984462SChris Mason get_bh(bh); 1423f2984462SChris Mason set_buffer_uptodate(bh); 1424f2984462SChris Mason lock_buffer(bh); 1425f2984462SChris Mason bh->b_end_io = btrfs_end_buffer_write_sync; 1426f2984462SChris Mason 1427f2984462SChris Mason if (do_barriers && dev->barriers) { 1428f2984462SChris Mason ret = submit_bh(WRITE_BARRIER, bh); 1429f2984462SChris Mason if (ret == -EOPNOTSUPP) { 1430f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1431f2984462SChris Mason dev->name); 1432f2984462SChris Mason set_buffer_uptodate(bh); 1433f2984462SChris Mason dev->barriers = 0; 1434f2984462SChris Mason get_bh(bh); 1435f2984462SChris Mason lock_buffer(bh); 1436f2984462SChris Mason ret = submit_bh(WRITE, bh); 1437f2984462SChris Mason } 1438f2984462SChris Mason } else { 1439f2984462SChris Mason ret = submit_bh(WRITE, bh); 1440f2984462SChris Mason } 1441a236aed1SChris Mason if (ret) 1442a236aed1SChris Mason total_errors++; 1443f2984462SChris Mason } 1444a236aed1SChris Mason if (total_errors > max_errors) { 1445a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1446a236aed1SChris Mason BUG(); 1447a236aed1SChris Mason } 1448a236aed1SChris Mason total_errors = 0; 1449f2984462SChris Mason 1450f2984462SChris Mason list_for_each(cur, head) { 1451f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1452f2984462SChris Mason BUG_ON(!dev->pending_io); 1453f2984462SChris Mason bh = dev->pending_io; 1454f2984462SChris Mason wait_on_buffer(bh); 1455f2984462SChris Mason if (!buffer_uptodate(dev->pending_io)) { 1456f2984462SChris Mason if (do_barriers && dev->barriers) { 1457f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1458f2984462SChris Mason dev->name); 1459f2984462SChris Mason set_buffer_uptodate(bh); 1460f2984462SChris Mason get_bh(bh); 1461f2984462SChris Mason lock_buffer(bh); 1462f2984462SChris Mason dev->barriers = 0; 1463f2984462SChris Mason ret = submit_bh(WRITE, bh); 1464f2984462SChris Mason BUG_ON(ret); 1465f2984462SChris Mason wait_on_buffer(bh); 1466f2984462SChris Mason BUG_ON(!buffer_uptodate(bh)); 1467f2984462SChris Mason } else { 1468a236aed1SChris Mason total_errors++; 1469f2984462SChris Mason } 1470f2984462SChris Mason 1471f2984462SChris Mason } 1472f2984462SChris Mason dev->pending_io = NULL; 1473f2984462SChris Mason brelse(bh); 1474f2984462SChris Mason } 1475a236aed1SChris Mason if (total_errors > max_errors) { 1476a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1477a236aed1SChris Mason BUG(); 1478a236aed1SChris Mason } 1479f2984462SChris Mason return 0; 1480f2984462SChris Mason } 1481f2984462SChris Mason 1482e089f05cSChris Mason int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root 148379154b1bSChris Mason *root) 1484cfaa7295SChris Mason { 1485e66f709bSChris Mason int ret; 14862c90e5d6SChris Mason 1487f2984462SChris Mason ret = write_all_supers(root); 14885f39d397SChris Mason return ret; 1489cfaa7295SChris Mason } 1490cfaa7295SChris Mason 14915eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 14922619ba1fSChris Mason { 14932619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 14942619ba1fSChris Mason (unsigned long)root->root_key.objectid); 1495b99aa6cbSChris Mason if (root->in_sysfs) 149658176a96SJosef Bacik btrfs_sysfs_del_root(root); 14972619ba1fSChris Mason if (root->inode) 14982619ba1fSChris Mason iput(root->inode); 14992619ba1fSChris Mason if (root->node) 15005f39d397SChris Mason free_extent_buffer(root->node); 15012619ba1fSChris Mason if (root->commit_root) 15025f39d397SChris Mason free_extent_buffer(root->commit_root); 150358176a96SJosef Bacik if (root->name) 150458176a96SJosef Bacik kfree(root->name); 15052619ba1fSChris Mason kfree(root); 15062619ba1fSChris Mason return 0; 15072619ba1fSChris Mason } 15082619ba1fSChris Mason 150935b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 15100f7d52f4SChris Mason { 15110f7d52f4SChris Mason int ret; 15120f7d52f4SChris Mason struct btrfs_root *gang[8]; 15130f7d52f4SChris Mason int i; 15140f7d52f4SChris Mason 15150f7d52f4SChris Mason while(1) { 15160f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 15170f7d52f4SChris Mason (void **)gang, 0, 15180f7d52f4SChris Mason ARRAY_SIZE(gang)); 15190f7d52f4SChris Mason if (!ret) 15200f7d52f4SChris Mason break; 15212619ba1fSChris Mason for (i = 0; i < ret; i++) 15225eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 15230f7d52f4SChris Mason } 15240f7d52f4SChris Mason return 0; 15250f7d52f4SChris Mason } 1526b4100d64SChris Mason 1527e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 1528eb60ceacSChris Mason { 15293768f368SChris Mason int ret; 1530e089f05cSChris Mason struct btrfs_trans_handle *trans; 15310f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 1532e089f05cSChris Mason 1533facda1e7SChris Mason fs_info->closing = 1; 153408607c1bSChris Mason btrfs_transaction_flush_work(root); 15350f7d52f4SChris Mason mutex_lock(&fs_info->fs_mutex); 15366702ed49SChris Mason btrfs_defrag_dirty_roots(root->fs_info); 153779154b1bSChris Mason trans = btrfs_start_transaction(root, 1); 153854aa1f4dSChris Mason ret = btrfs_commit_transaction(trans, root); 153979154b1bSChris Mason /* run commit again to drop the original snapshot */ 154079154b1bSChris Mason trans = btrfs_start_transaction(root, 1); 154179154b1bSChris Mason btrfs_commit_transaction(trans, root); 154279154b1bSChris Mason ret = btrfs_write_and_wait_transaction(NULL, root); 15439f5fae2fSChris Mason BUG_ON(ret); 1544d6bfde87SChris Mason 154579154b1bSChris Mason write_ctree_super(NULL, root); 15460f7d52f4SChris Mason mutex_unlock(&fs_info->fs_mutex); 1547ed2ff2cbSChris Mason 15489ad6b7bcSChris Mason btrfs_transaction_flush_work(root); 15499ad6b7bcSChris Mason 1550b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 1551b0c68f8bSChris Mason printk("btrfs: at unmount delalloc count %Lu\n", 1552b0c68f8bSChris Mason fs_info->delalloc_bytes); 1553b0c68f8bSChris Mason } 15540f7d52f4SChris Mason if (fs_info->extent_root->node) 15555f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 1556f510cfecSChris Mason 15570f7d52f4SChris Mason if (fs_info->tree_root->node) 15585f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 1559f510cfecSChris Mason 15600b86a832SChris Mason if (root->fs_info->chunk_root->node); 15610b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 15620b86a832SChris Mason 15630b86a832SChris Mason if (root->fs_info->dev_root->node); 15640b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 15650b86a832SChris Mason 15669078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 15670f7d52f4SChris Mason del_fs_roots(fs_info); 1568d10c5f31SChris Mason 1569d10c5f31SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 1570d10c5f31SChris Mason 1571d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->free_space_cache); 1572d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->block_group_cache); 1573d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->pinned_extents); 1574d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->pending_del); 1575d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->extent_ins); 1576d1310b2eSChris Mason extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree); 1577d10c5f31SChris Mason 15789ad6b7bcSChris Mason flush_workqueue(async_submit_workqueue); 1579d6bfde87SChris Mason flush_workqueue(end_io_workqueue); 15809ad6b7bcSChris Mason 1581db94535dSChris Mason truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); 15829ad6b7bcSChris Mason 158344b8bd7eSChris Mason flush_workqueue(async_submit_workqueue); 158444b8bd7eSChris Mason destroy_workqueue(async_submit_workqueue); 158544b8bd7eSChris Mason 1586d6bfde87SChris Mason flush_workqueue(end_io_workqueue); 1587d6bfde87SChris Mason destroy_workqueue(end_io_workqueue); 1588d6bfde87SChris Mason 1589db94535dSChris Mason iput(fs_info->btree_inode); 159019c00ddcSChris Mason #if 0 159119c00ddcSChris Mason while(!list_empty(&fs_info->hashers)) { 159219c00ddcSChris Mason struct btrfs_hasher *hasher; 159319c00ddcSChris Mason hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher, 159419c00ddcSChris Mason hashers); 159519c00ddcSChris Mason list_del(&hasher->hashers); 159619c00ddcSChris Mason crypto_free_hash(&fs_info->hash_tfm); 159719c00ddcSChris Mason kfree(hasher); 159819c00ddcSChris Mason } 159919c00ddcSChris Mason #endif 16000b86a832SChris Mason close_all_devices(fs_info); 16010b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 1602b248a415SChris Mason 1603b248a415SChris Mason #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) 160404160088SChris Mason bdi_destroy(&fs_info->bdi); 1605b248a415SChris Mason #endif 16060b86a832SChris Mason 16070f7d52f4SChris Mason kfree(fs_info->extent_root); 16080f7d52f4SChris Mason kfree(fs_info->tree_root); 16090b86a832SChris Mason kfree(fs_info->chunk_root); 16100b86a832SChris Mason kfree(fs_info->dev_root); 1611eb60ceacSChris Mason return 0; 1612eb60ceacSChris Mason } 1613eb60ceacSChris Mason 16145f39d397SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf) 1615ccd467d6SChris Mason { 1616810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 1617d1310b2eSChris Mason return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); 16185f39d397SChris Mason } 16196702ed49SChris Mason 16205f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 16215f39d397SChris Mason { 1622810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 1623d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 16245f39d397SChris Mason buf); 16255f39d397SChris Mason } 16265f39d397SChris Mason 16275f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 16285f39d397SChris Mason { 1629810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 16305f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 16315f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 16326702ed49SChris Mason 1633ccd467d6SChris Mason if (transid != root->fs_info->generation) { 1634ccd467d6SChris Mason printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", 1635db94535dSChris Mason (unsigned long long)buf->start, 1636ccd467d6SChris Mason transid, root->fs_info->generation); 1637ccd467d6SChris Mason WARN_ON(1); 1638ccd467d6SChris Mason } 1639d1310b2eSChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); 1640eb60ceacSChris Mason } 1641eb60ceacSChris Mason 1642e2008b61SChris Mason void btrfs_throttle(struct btrfs_root *root) 1643e2008b61SChris Mason { 164455c69072SChris Mason struct backing_dev_info *bdi; 164555c69072SChris Mason 1646a061fc8dSChris Mason bdi = &root->fs_info->bdi; 164704005cc7SChris Mason if (root->fs_info->throttles && bdi_write_congested(bdi)) { 164804005cc7SChris Mason #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18) 164955c69072SChris Mason congestion_wait(WRITE, HZ/20); 165004005cc7SChris Mason #else 165104005cc7SChris Mason blk_congestion_wait(WRITE, HZ/20); 165204005cc7SChris Mason #endif 165304005cc7SChris Mason } 1654e2008b61SChris Mason } 1655e2008b61SChris Mason 1656d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 165735b7e476SChris Mason { 1658d6bfde87SChris Mason struct extent_io_tree *tree; 1659d6bfde87SChris Mason u64 num_dirty; 1660d6bfde87SChris Mason u64 start = 0; 1661d6bfde87SChris Mason unsigned long thresh = 16 * 1024 * 1024; 1662d6bfde87SChris Mason tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 1663d6bfde87SChris Mason 1664d6bfde87SChris Mason if (current_is_pdflush()) 1665d6bfde87SChris Mason return; 1666d6bfde87SChris Mason 1667d6bfde87SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 1668d6bfde87SChris Mason thresh, EXTENT_DIRTY); 1669d6bfde87SChris Mason if (num_dirty > thresh) { 1670d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 1671304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 167235b7e476SChris Mason } 1673d6bfde87SChris Mason } 16746b80053dSChris Mason 16756b80053dSChris Mason void btrfs_set_buffer_defrag(struct extent_buffer *buf) 16766b80053dSChris Mason { 1677810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 16786b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1679d1310b2eSChris Mason set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start, 16806b80053dSChris Mason buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS); 16816b80053dSChris Mason } 16826b80053dSChris Mason 16836b80053dSChris Mason void btrfs_set_buffer_defrag_done(struct extent_buffer *buf) 16846b80053dSChris Mason { 1685810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 16866b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1687d1310b2eSChris Mason set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start, 16886b80053dSChris Mason buf->start + buf->len - 1, EXTENT_DEFRAG_DONE, 16896b80053dSChris Mason GFP_NOFS); 16906b80053dSChris Mason } 16916b80053dSChris Mason 16926b80053dSChris Mason int btrfs_buffer_defrag(struct extent_buffer *buf) 16936b80053dSChris Mason { 1694810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 16956b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1696d1310b2eSChris Mason return test_range_bit(&BTRFS_I(btree_inode)->io_tree, 16976b80053dSChris Mason buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0); 16986b80053dSChris Mason } 16996b80053dSChris Mason 17006b80053dSChris Mason int btrfs_buffer_defrag_done(struct extent_buffer *buf) 17016b80053dSChris Mason { 1702810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17036b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1704d1310b2eSChris Mason return test_range_bit(&BTRFS_I(btree_inode)->io_tree, 17056b80053dSChris Mason buf->start, buf->start + buf->len - 1, 17066b80053dSChris Mason EXTENT_DEFRAG_DONE, 0); 17076b80053dSChris Mason } 17086b80053dSChris Mason 17096b80053dSChris Mason int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf) 17106b80053dSChris Mason { 1711810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17126b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1713d1310b2eSChris Mason return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree, 17146b80053dSChris Mason buf->start, buf->start + buf->len - 1, 17156b80053dSChris Mason EXTENT_DEFRAG_DONE, GFP_NOFS); 17166b80053dSChris Mason } 17176b80053dSChris Mason 17186b80053dSChris Mason int btrfs_clear_buffer_defrag(struct extent_buffer *buf) 17196b80053dSChris Mason { 1720810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17216b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1722d1310b2eSChris Mason return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree, 17236b80053dSChris Mason buf->start, buf->start + buf->len - 1, 17246b80053dSChris Mason EXTENT_DEFRAG, GFP_NOFS); 17256b80053dSChris Mason } 17266b80053dSChris Mason 17276b80053dSChris Mason int btrfs_read_buffer(struct extent_buffer *buf) 17286b80053dSChris Mason { 1729810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 1730ce9adaa5SChris Mason int ret; 1731f188591eSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0); 1732ce9adaa5SChris Mason if (ret == 0) { 1733ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 1734ce9adaa5SChris Mason } 1735ce9adaa5SChris Mason return ret; 17366b80053dSChris Mason } 17370da5468fSChris Mason 1738d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 17390da5468fSChris Mason .writepage_io_hook = btree_writepage_io_hook, 1740ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 17410b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 1742239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 1743239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 17440da5468fSChris Mason }; 1745