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" 348b712842SChris Mason #include "async-thread.h" 35925baeddSChris Mason #include "locking.h" 36eb60ceacSChris Mason 375f39d397SChris Mason #if 0 385f39d397SChris Mason static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) 397eccb903SChris Mason { 405f39d397SChris Mason if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) { 415f39d397SChris Mason printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n", 425f39d397SChris Mason (unsigned long long)extent_buffer_blocknr(buf), 435f39d397SChris Mason (unsigned long long)btrfs_header_blocknr(buf)); 4439279cc3SChris Mason return 1; 45d98237b3SChris Mason } 469a8dd150SChris Mason return 0; 47eb60ceacSChris Mason } 485f39d397SChris Mason #endif 49eb60ceacSChris Mason 50d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops; 518b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 52ce9adaa5SChris Mason 53ce9adaa5SChris Mason struct end_io_wq { 54ce9adaa5SChris Mason struct bio *bio; 55ce9adaa5SChris Mason bio_end_io_t *end_io; 56ce9adaa5SChris Mason void *private; 57ce9adaa5SChris Mason struct btrfs_fs_info *info; 58ce9adaa5SChris Mason int error; 5922c59948SChris Mason int metadata; 60ce9adaa5SChris Mason struct list_head list; 618b712842SChris Mason struct btrfs_work work; 62ce9adaa5SChris Mason }; 630da5468fSChris Mason 6444b8bd7eSChris Mason struct async_submit_bio { 6544b8bd7eSChris Mason struct inode *inode; 6644b8bd7eSChris Mason struct bio *bio; 6744b8bd7eSChris Mason struct list_head list; 6844b8bd7eSChris Mason extent_submit_bio_hook_t *submit_bio_hook; 6944b8bd7eSChris Mason int rw; 7044b8bd7eSChris Mason int mirror_num; 718b712842SChris Mason struct btrfs_work work; 7244b8bd7eSChris Mason }; 7344b8bd7eSChris Mason 745f39d397SChris Mason struct extent_map *btree_get_extent(struct inode *inode, struct page *page, 75d1310b2eSChris Mason size_t page_offset, u64 start, u64 len, 765f39d397SChris Mason int create) 775f39d397SChris Mason { 785f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 795f39d397SChris Mason struct extent_map *em; 805f39d397SChris Mason int ret; 815f39d397SChris Mason 82d1310b2eSChris Mason spin_lock(&em_tree->lock); 83d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 84a061fc8dSChris Mason if (em) { 85a061fc8dSChris Mason em->bdev = 86a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 87d1310b2eSChris Mason spin_unlock(&em_tree->lock); 885f39d397SChris Mason goto out; 89a061fc8dSChris Mason } 90a061fc8dSChris Mason spin_unlock(&em_tree->lock); 917b13b7b1SChris Mason 925f39d397SChris Mason em = alloc_extent_map(GFP_NOFS); 935f39d397SChris Mason if (!em) { 945f39d397SChris Mason em = ERR_PTR(-ENOMEM); 955f39d397SChris Mason goto out; 965f39d397SChris Mason } 975f39d397SChris Mason em->start = 0; 980afbaf8cSChris Mason em->len = (u64)-1; 995f39d397SChris Mason em->block_start = 0; 100a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 101d1310b2eSChris Mason 102d1310b2eSChris Mason spin_lock(&em_tree->lock); 1035f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 1045f39d397SChris Mason if (ret == -EEXIST) { 1050afbaf8cSChris Mason u64 failed_start = em->start; 1060afbaf8cSChris Mason u64 failed_len = em->len; 1070afbaf8cSChris Mason 1080afbaf8cSChris Mason printk("failed to insert %Lu %Lu -> %Lu into tree\n", 1090afbaf8cSChris Mason em->start, em->len, em->block_start); 1105f39d397SChris Mason free_extent_map(em); 1117b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1120afbaf8cSChris Mason if (em) { 1130afbaf8cSChris Mason printk("after failing, found %Lu %Lu %Lu\n", 1140afbaf8cSChris Mason em->start, em->len, em->block_start); 1157b13b7b1SChris Mason ret = 0; 1160afbaf8cSChris Mason } else { 1170afbaf8cSChris Mason em = lookup_extent_mapping(em_tree, failed_start, 1180afbaf8cSChris Mason failed_len); 1190afbaf8cSChris Mason if (em) { 1200afbaf8cSChris Mason printk("double failure lookup gives us " 1210afbaf8cSChris Mason "%Lu %Lu -> %Lu\n", em->start, 1220afbaf8cSChris Mason em->len, em->block_start); 1230afbaf8cSChris Mason free_extent_map(em); 1240afbaf8cSChris Mason } 1257b13b7b1SChris Mason ret = -EIO; 1260afbaf8cSChris Mason } 1275f39d397SChris Mason } else if (ret) { 1287b13b7b1SChris Mason free_extent_map(em); 1297b13b7b1SChris Mason em = NULL; 1305f39d397SChris Mason } 1317b13b7b1SChris Mason spin_unlock(&em_tree->lock); 1327b13b7b1SChris Mason 1337b13b7b1SChris Mason if (ret) 1347b13b7b1SChris Mason em = ERR_PTR(ret); 1355f39d397SChris Mason out: 1365f39d397SChris Mason return em; 1375f39d397SChris Mason } 1385f39d397SChris Mason 13919c00ddcSChris Mason u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) 14019c00ddcSChris Mason { 141a5eb62e3SMiguel return btrfs_crc32c(seed, data, len); 14219c00ddcSChris Mason } 14319c00ddcSChris Mason 14419c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 14519c00ddcSChris Mason { 14619c00ddcSChris Mason *(__le32 *)result = ~cpu_to_le32(crc); 14719c00ddcSChris Mason } 14819c00ddcSChris Mason 14919c00ddcSChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 15019c00ddcSChris Mason int verify) 15119c00ddcSChris Mason { 15219c00ddcSChris Mason char result[BTRFS_CRC32_SIZE]; 15319c00ddcSChris Mason unsigned long len; 15419c00ddcSChris Mason unsigned long cur_len; 15519c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 15619c00ddcSChris Mason char *map_token = NULL; 15719c00ddcSChris Mason char *kaddr; 15819c00ddcSChris Mason unsigned long map_start; 15919c00ddcSChris Mason unsigned long map_len; 16019c00ddcSChris Mason int err; 16119c00ddcSChris Mason u32 crc = ~(u32)0; 16219c00ddcSChris Mason 16319c00ddcSChris Mason len = buf->len - offset; 16419c00ddcSChris Mason while(len > 0) { 16519c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 16619c00ddcSChris Mason &map_token, &kaddr, 16719c00ddcSChris Mason &map_start, &map_len, KM_USER0); 16819c00ddcSChris Mason if (err) { 16919c00ddcSChris Mason printk("failed to map extent buffer! %lu\n", 17019c00ddcSChris Mason offset); 17119c00ddcSChris Mason return 1; 17219c00ddcSChris Mason } 17319c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 17419c00ddcSChris Mason crc = btrfs_csum_data(root, kaddr + offset - map_start, 17519c00ddcSChris Mason crc, cur_len); 17619c00ddcSChris Mason len -= cur_len; 17719c00ddcSChris Mason offset += cur_len; 17819c00ddcSChris Mason unmap_extent_buffer(buf, map_token, KM_USER0); 17919c00ddcSChris Mason } 18019c00ddcSChris Mason btrfs_csum_final(crc, result); 18119c00ddcSChris Mason 18219c00ddcSChris Mason if (verify) { 183e4204dedSChris Mason int from_this_trans = 0; 184e4204dedSChris Mason 185e4204dedSChris Mason if (root->fs_info->running_transaction && 186e4204dedSChris Mason btrfs_header_generation(buf) == 187e4204dedSChris Mason root->fs_info->running_transaction->transid) 188e4204dedSChris Mason from_this_trans = 1; 189e4204dedSChris Mason 190e4204dedSChris Mason /* FIXME, this is not good */ 19163b10fc4SChris Mason if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) { 192e4204dedSChris Mason u32 val; 193e4204dedSChris Mason u32 found = 0; 194e4204dedSChris Mason memcpy(&found, result, BTRFS_CRC32_SIZE); 195e4204dedSChris Mason 196e4204dedSChris Mason read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE); 197e4204dedSChris Mason printk("btrfs: %s checksum verify failed on %llu " 19863b10fc4SChris Mason "wanted %X found %X from_this_trans %d " 19963b10fc4SChris Mason "level %d\n", 20019c00ddcSChris Mason root->fs_info->sb->s_id, 20163b10fc4SChris Mason buf->start, val, found, from_this_trans, 20263b10fc4SChris Mason btrfs_header_level(buf)); 20319c00ddcSChris Mason return 1; 20419c00ddcSChris Mason } 20519c00ddcSChris Mason } else { 20619c00ddcSChris Mason write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE); 20719c00ddcSChris Mason } 20819c00ddcSChris Mason return 0; 20919c00ddcSChris Mason } 21019c00ddcSChris Mason 2111259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 2121259ab75SChris Mason struct extent_buffer *eb, u64 parent_transid) 2131259ab75SChris Mason { 2141259ab75SChris Mason int ret; 2151259ab75SChris Mason 2161259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 2171259ab75SChris Mason return 0; 2181259ab75SChris Mason 2191259ab75SChris Mason lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS); 2201259ab75SChris Mason if (extent_buffer_uptodate(io_tree, eb) && 2211259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 2221259ab75SChris Mason ret = 0; 2231259ab75SChris Mason goto out; 2241259ab75SChris Mason } 2251259ab75SChris Mason printk("parent transid verify failed on %llu wanted %llu found %llu\n", 2261259ab75SChris Mason (unsigned long long)eb->start, 2271259ab75SChris Mason (unsigned long long)parent_transid, 2281259ab75SChris Mason (unsigned long long)btrfs_header_generation(eb)); 2291259ab75SChris Mason ret = 1; 2301259ab75SChris Mason out: 2311259ab75SChris Mason clear_extent_buffer_uptodate(io_tree, eb); 2321259ab75SChris Mason unlock_extent(io_tree, eb->start, eb->start + eb->len - 1, 2331259ab75SChris Mason GFP_NOFS); 2341259ab75SChris Mason return ret; 2351259ab75SChris Mason 2361259ab75SChris Mason } 2371259ab75SChris Mason 238f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 239f188591eSChris Mason struct extent_buffer *eb, 240ca7a79adSChris Mason u64 start, u64 parent_transid) 241f188591eSChris Mason { 242f188591eSChris Mason struct extent_io_tree *io_tree; 243f188591eSChris Mason int ret; 244f188591eSChris Mason int num_copies = 0; 245f188591eSChris Mason int mirror_num = 0; 246f188591eSChris Mason 247f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 248f188591eSChris Mason while (1) { 249f188591eSChris Mason ret = read_extent_buffer_pages(io_tree, eb, start, 1, 250f188591eSChris Mason btree_get_extent, mirror_num); 2511259ab75SChris Mason if (!ret && 2521259ab75SChris Mason !verify_parent_transid(io_tree, eb, parent_transid)) 253f188591eSChris Mason return ret; 2544235298eSChris Mason 255f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 256f188591eSChris Mason eb->start, eb->len); 2574235298eSChris Mason if (num_copies == 1) 258f188591eSChris Mason return ret; 2594235298eSChris Mason 260f188591eSChris Mason mirror_num++; 2614235298eSChris Mason if (mirror_num > num_copies) 262f188591eSChris Mason return ret; 263f188591eSChris Mason } 264f188591eSChris Mason return -EIO; 265f188591eSChris Mason } 26619c00ddcSChris Mason 26719c00ddcSChris Mason int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 26819c00ddcSChris Mason { 269d1310b2eSChris Mason struct extent_io_tree *tree; 27035ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 27119c00ddcSChris Mason u64 found_start; 27219c00ddcSChris Mason int found_level; 27319c00ddcSChris Mason unsigned long len; 27419c00ddcSChris Mason struct extent_buffer *eb; 275f188591eSChris Mason int ret; 276f188591eSChris Mason 277d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 27819c00ddcSChris Mason 27919c00ddcSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 28019c00ddcSChris Mason goto out; 28119c00ddcSChris Mason if (!page->private) 28219c00ddcSChris Mason goto out; 28319c00ddcSChris Mason len = page->private >> 2; 28419c00ddcSChris Mason if (len == 0) { 28519c00ddcSChris Mason WARN_ON(1); 28619c00ddcSChris Mason } 28719c00ddcSChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 288ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, 289ca7a79adSChris Mason btrfs_header_generation(eb)); 290f188591eSChris Mason BUG_ON(ret); 291e18e4809SChris Mason btrfs_clear_buffer_defrag(eb); 29219c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 29319c00ddcSChris Mason if (found_start != start) { 29419c00ddcSChris Mason printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n", 29519c00ddcSChris Mason start, found_start, len); 29655c69072SChris Mason WARN_ON(1); 29755c69072SChris Mason goto err; 29855c69072SChris Mason } 29955c69072SChris Mason if (eb->first_page != page) { 30055c69072SChris Mason printk("bad first page %lu %lu\n", eb->first_page->index, 30155c69072SChris Mason page->index); 30255c69072SChris Mason WARN_ON(1); 30355c69072SChris Mason goto err; 30455c69072SChris Mason } 30555c69072SChris Mason if (!PageUptodate(page)) { 30655c69072SChris Mason printk("csum not up to date page %lu\n", page->index); 30755c69072SChris Mason WARN_ON(1); 30855c69072SChris Mason goto err; 30919c00ddcSChris Mason } 31019c00ddcSChris Mason found_level = btrfs_header_level(eb); 31163b10fc4SChris Mason spin_lock(&root->fs_info->hash_lock); 31263b10fc4SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 31363b10fc4SChris Mason spin_unlock(&root->fs_info->hash_lock); 31419c00ddcSChris Mason csum_tree_block(root, eb, 0); 31555c69072SChris Mason err: 31619c00ddcSChris Mason free_extent_buffer(eb); 31719c00ddcSChris Mason out: 31819c00ddcSChris Mason return 0; 31919c00ddcSChris Mason } 32019c00ddcSChris Mason 3210da5468fSChris Mason static int btree_writepage_io_hook(struct page *page, u64 start, u64 end) 3220da5468fSChris Mason { 3230da5468fSChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 3240da5468fSChris Mason 3250da5468fSChris Mason csum_dirty_buffer(root, page); 3260da5468fSChris Mason return 0; 3270da5468fSChris Mason } 3280da5468fSChris Mason 329ce9adaa5SChris Mason int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 330ce9adaa5SChris Mason struct extent_state *state) 331ce9adaa5SChris Mason { 332ce9adaa5SChris Mason struct extent_io_tree *tree; 333ce9adaa5SChris Mason u64 found_start; 334ce9adaa5SChris Mason int found_level; 335ce9adaa5SChris Mason unsigned long len; 336ce9adaa5SChris Mason struct extent_buffer *eb; 337ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 338f188591eSChris Mason int ret = 0; 339ce9adaa5SChris Mason 340ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 341ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 342ce9adaa5SChris Mason goto out; 343ce9adaa5SChris Mason if (!page->private) 344ce9adaa5SChris Mason goto out; 345ce9adaa5SChris Mason len = page->private >> 2; 346ce9adaa5SChris Mason if (len == 0) { 347ce9adaa5SChris Mason WARN_ON(1); 348ce9adaa5SChris Mason } 349ce9adaa5SChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 350f188591eSChris Mason 351ce9adaa5SChris Mason btrfs_clear_buffer_defrag(eb); 352ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 353ce9adaa5SChris Mason if (found_start != start) { 354f188591eSChris Mason ret = -EIO; 355ce9adaa5SChris Mason goto err; 356ce9adaa5SChris Mason } 357ce9adaa5SChris Mason if (eb->first_page != page) { 358ce9adaa5SChris Mason printk("bad first page %lu %lu\n", eb->first_page->index, 359ce9adaa5SChris Mason page->index); 360ce9adaa5SChris Mason WARN_ON(1); 361f188591eSChris Mason ret = -EIO; 362ce9adaa5SChris Mason goto err; 363ce9adaa5SChris Mason } 3641259ab75SChris Mason if (memcmp_extent_buffer(eb, root->fs_info->fsid, 3651259ab75SChris Mason (unsigned long)btrfs_header_fsid(eb), 3661259ab75SChris Mason BTRFS_FSID_SIZE)) { 3671259ab75SChris Mason printk("bad fsid on block %Lu\n", eb->start); 3681259ab75SChris Mason ret = -EIO; 3691259ab75SChris Mason goto err; 3701259ab75SChris Mason } 371ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 372ce9adaa5SChris Mason 373ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 374f188591eSChris Mason if (ret) 375f188591eSChris Mason ret = -EIO; 376ce9adaa5SChris Mason 377ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 378ce9adaa5SChris Mason end = eb->start + end - 1; 379ce9adaa5SChris Mason release_extent_buffer_tail_pages(eb); 380ce9adaa5SChris Mason err: 381ce9adaa5SChris Mason free_extent_buffer(eb); 382ce9adaa5SChris Mason out: 383f188591eSChris Mason return ret; 384ce9adaa5SChris Mason } 385ce9adaa5SChris Mason 386ce9adaa5SChris Mason #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) 387ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 388ce9adaa5SChris Mason #else 389ce9adaa5SChris Mason static int end_workqueue_bio(struct bio *bio, 390ce9adaa5SChris Mason unsigned int bytes_done, int err) 391ce9adaa5SChris Mason #endif 392ce9adaa5SChris Mason { 393ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 394ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 395ce9adaa5SChris Mason 396ce9adaa5SChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) 397ce9adaa5SChris Mason if (bio->bi_size) 398ce9adaa5SChris Mason return 1; 399ce9adaa5SChris Mason #endif 400ce9adaa5SChris Mason 401ce9adaa5SChris Mason fs_info = end_io_wq->info; 402ce9adaa5SChris Mason end_io_wq->error = err; 4038b712842SChris Mason end_io_wq->work.func = end_workqueue_fn; 4048b712842SChris Mason end_io_wq->work.flags = 0; 4058b712842SChris Mason btrfs_queue_worker(&fs_info->endio_workers, &end_io_wq->work); 406ce9adaa5SChris Mason 407ce9adaa5SChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) 408ce9adaa5SChris Mason return 0; 409ce9adaa5SChris Mason #endif 410ce9adaa5SChris Mason } 411ce9adaa5SChris Mason 41222c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 41322c59948SChris Mason int metadata) 4140b86a832SChris Mason { 415ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 416ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 417ce9adaa5SChris Mason if (!end_io_wq) 418ce9adaa5SChris Mason return -ENOMEM; 419ce9adaa5SChris Mason 420ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 421ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 42222c59948SChris Mason end_io_wq->info = info; 423ce9adaa5SChris Mason end_io_wq->error = 0; 424ce9adaa5SChris Mason end_io_wq->bio = bio; 42522c59948SChris Mason end_io_wq->metadata = metadata; 426ce9adaa5SChris Mason 427ce9adaa5SChris Mason bio->bi_private = end_io_wq; 428ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 42922c59948SChris Mason return 0; 43022c59948SChris Mason } 43122c59948SChris Mason 4328b712842SChris Mason static void run_one_async_submit(struct btrfs_work *work) 4338b712842SChris Mason { 4348b712842SChris Mason struct btrfs_fs_info *fs_info; 4358b712842SChris Mason struct async_submit_bio *async; 4368b712842SChris Mason 4378b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 4388b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 4398b712842SChris Mason atomic_dec(&fs_info->nr_async_submits); 4408b712842SChris Mason async->submit_bio_hook(async->inode, async->rw, async->bio, 4418b712842SChris Mason async->mirror_num); 4428b712842SChris Mason kfree(async); 4438b712842SChris Mason } 4448b712842SChris Mason 44544b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 44644b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 44744b8bd7eSChris Mason extent_submit_bio_hook_t *submit_bio_hook) 44844b8bd7eSChris Mason { 44944b8bd7eSChris Mason struct async_submit_bio *async; 45044b8bd7eSChris Mason 45144b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 45244b8bd7eSChris Mason if (!async) 45344b8bd7eSChris Mason return -ENOMEM; 45444b8bd7eSChris Mason 45544b8bd7eSChris Mason async->inode = inode; 45644b8bd7eSChris Mason async->rw = rw; 45744b8bd7eSChris Mason async->bio = bio; 45844b8bd7eSChris Mason async->mirror_num = mirror_num; 45944b8bd7eSChris Mason async->submit_bio_hook = submit_bio_hook; 4608b712842SChris Mason async->work.func = run_one_async_submit; 4618b712842SChris Mason async->work.flags = 0; 462cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 4638b712842SChris Mason btrfs_queue_worker(&fs_info->workers, &async->work); 46444b8bd7eSChris Mason return 0; 46544b8bd7eSChris Mason } 46644b8bd7eSChris Mason 46744b8bd7eSChris Mason static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 468f188591eSChris Mason int mirror_num) 46922c59948SChris Mason { 47022c59948SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 47122c59948SChris Mason u64 offset; 47222c59948SChris Mason int ret; 47322c59948SChris Mason 47422c59948SChris Mason offset = bio->bi_sector << 9; 47522c59948SChris Mason 4768b712842SChris Mason /* 4778b712842SChris Mason * when we're called for a write, we're already in the async 4788b712842SChris Mason * submission context. Just jump ingo btrfs_map_bio 4798b712842SChris Mason */ 48022c59948SChris Mason if (rw & (1 << BIO_RW)) { 4818b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 4828b712842SChris Mason mirror_num, 0); 48322c59948SChris Mason } 48422c59948SChris Mason 4858b712842SChris Mason /* 4868b712842SChris Mason * called for a read, do the setup so that checksum validation 4878b712842SChris Mason * can happen in the async kernel threads 4888b712842SChris Mason */ 48922c59948SChris Mason ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1); 49022c59948SChris Mason BUG_ON(ret); 491ce9adaa5SChris Mason 4928b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 4930b86a832SChris Mason } 4940b86a832SChris Mason 49544b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 49644b8bd7eSChris Mason int mirror_num) 49744b8bd7eSChris Mason { 4988b712842SChris Mason /* 4998b712842SChris Mason * kthread helpers are used to submit writes so that checksumming 5008b712842SChris Mason * can happen in parallel across all CPUs 5018b712842SChris Mason */ 50244b8bd7eSChris Mason if (!(rw & (1 << BIO_RW))) { 50344b8bd7eSChris Mason return __btree_submit_bio_hook(inode, rw, bio, mirror_num); 50444b8bd7eSChris Mason } 50544b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 50644b8bd7eSChris Mason inode, rw, bio, mirror_num, 50744b8bd7eSChris Mason __btree_submit_bio_hook); 50844b8bd7eSChris Mason } 50944b8bd7eSChris Mason 5105f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 5115f39d397SChris Mason { 512d1310b2eSChris Mason struct extent_io_tree *tree; 513d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 5145f39d397SChris Mason return extent_write_full_page(tree, page, btree_get_extent, wbc); 5155f39d397SChris Mason } 5160da5468fSChris Mason 5170da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 5180da5468fSChris Mason struct writeback_control *wbc) 5190da5468fSChris Mason { 520d1310b2eSChris Mason struct extent_io_tree *tree; 521d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 522d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 523793955bcSChris Mason u64 num_dirty; 524793955bcSChris Mason u64 start = 0; 525793955bcSChris Mason unsigned long thresh = 96 * 1024 * 1024; 526448d640bSChris Mason 527448d640bSChris Mason if (wbc->for_kupdate) 528448d640bSChris Mason return 0; 529448d640bSChris Mason 530ca664626SChris Mason if (current_is_pdflush()) { 531ca664626SChris Mason thresh = 96 * 1024 * 1024; 532ca664626SChris Mason } else { 533ca664626SChris Mason thresh = 8 * 1024 * 1024; 534ca664626SChris Mason } 5351832a6d5SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 5361832a6d5SChris Mason thresh, EXTENT_DIRTY); 537793955bcSChris Mason if (num_dirty < thresh) { 538793955bcSChris Mason return 0; 539793955bcSChris Mason } 540793955bcSChris Mason } 5410da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 5420da5468fSChris Mason } 5430da5468fSChris Mason 5445f39d397SChris Mason int btree_readpage(struct file *file, struct page *page) 5455f39d397SChris Mason { 546d1310b2eSChris Mason struct extent_io_tree *tree; 547d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 5485f39d397SChris Mason return extent_read_full_page(tree, page, btree_get_extent); 5495f39d397SChris Mason } 5505f39d397SChris Mason 55170dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 5525f39d397SChris Mason { 553d1310b2eSChris Mason struct extent_io_tree *tree; 554d1310b2eSChris Mason struct extent_map_tree *map; 5555f39d397SChris Mason int ret; 5565f39d397SChris Mason 5573dd39914SChris Mason if (page_count(page) > 3) { 5583dd39914SChris Mason /* once for page->private, once for the caller, once 5593dd39914SChris Mason * once for the page cache 5603dd39914SChris Mason */ 5613dd39914SChris Mason return 0; 5623dd39914SChris Mason } 563d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 564d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 5657b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 5665f39d397SChris Mason if (ret == 1) { 567728131d8SChris Mason invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); 5685f39d397SChris Mason ClearPagePrivate(page); 5695f39d397SChris Mason set_page_private(page, 0); 570d98237b3SChris Mason page_cache_release(page); 5715f39d397SChris Mason } 572d98237b3SChris Mason return ret; 573d98237b3SChris Mason } 574d98237b3SChris Mason 5755f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 576d98237b3SChris Mason { 577d1310b2eSChris Mason struct extent_io_tree *tree; 578d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 5795f39d397SChris Mason extent_invalidatepage(tree, page, offset); 5805f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 5819ad6b7bcSChris Mason if (PagePrivate(page)) { 5824ef64eaeSChris Mason invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); 5839ad6b7bcSChris Mason ClearPagePrivate(page); 5849ad6b7bcSChris Mason set_page_private(page, 0); 5859ad6b7bcSChris Mason page_cache_release(page); 5869ad6b7bcSChris Mason } 587d98237b3SChris Mason } 588d98237b3SChris Mason 5895f39d397SChris Mason #if 0 590d98237b3SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 591d98237b3SChris Mason { 59287cbda5cSChris Mason struct buffer_head *bh; 5930f7d52f4SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 59487cbda5cSChris Mason struct buffer_head *head; 59587cbda5cSChris Mason if (!page_has_buffers(page)) { 59687cbda5cSChris Mason create_empty_buffers(page, root->fs_info->sb->s_blocksize, 59787cbda5cSChris Mason (1 << BH_Dirty)|(1 << BH_Uptodate)); 59887cbda5cSChris Mason } 59987cbda5cSChris Mason head = page_buffers(page); 60087cbda5cSChris Mason bh = head; 60187cbda5cSChris Mason do { 60287cbda5cSChris Mason if (buffer_dirty(bh)) 60387cbda5cSChris Mason csum_tree_block(root, bh, 0); 60487cbda5cSChris Mason bh = bh->b_this_page; 60587cbda5cSChris Mason } while (bh != head); 606d98237b3SChris Mason return block_write_full_page(page, btree_get_block, wbc); 607d98237b3SChris Mason } 6085f39d397SChris Mason #endif 609d98237b3SChris Mason 610d98237b3SChris Mason static struct address_space_operations btree_aops = { 611d98237b3SChris Mason .readpage = btree_readpage, 612d98237b3SChris Mason .writepage = btree_writepage, 6130da5468fSChris Mason .writepages = btree_writepages, 6145f39d397SChris Mason .releasepage = btree_releasepage, 6155f39d397SChris Mason .invalidatepage = btree_invalidatepage, 616d98237b3SChris Mason .sync_page = block_sync_page, 617d98237b3SChris Mason }; 618123abc88SChris Mason 619ca7a79adSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, 620ca7a79adSChris Mason u64 parent_transid) 621090d1875SChris Mason { 6225f39d397SChris Mason struct extent_buffer *buf = NULL; 6235f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 624de428b63SChris Mason int ret = 0; 625090d1875SChris Mason 626db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 6275f39d397SChris Mason if (!buf) 628090d1875SChris Mason return 0; 629d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 630f188591eSChris Mason buf, 0, 0, btree_get_extent, 0); 6315f39d397SChris Mason free_extent_buffer(buf); 632de428b63SChris Mason return ret; 633090d1875SChris Mason } 634090d1875SChris Mason 6350999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 6360999df54SChris Mason u64 bytenr, u32 blocksize) 6370999df54SChris Mason { 6380999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 6390999df54SChris Mason struct extent_buffer *eb; 6400999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 6410999df54SChris Mason bytenr, blocksize, GFP_NOFS); 6420999df54SChris Mason return eb; 6430999df54SChris Mason } 6440999df54SChris Mason 6450999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 6460999df54SChris Mason u64 bytenr, u32 blocksize) 6470999df54SChris Mason { 6480999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 6490999df54SChris Mason struct extent_buffer *eb; 6500999df54SChris Mason 6510999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 6520999df54SChris Mason bytenr, blocksize, NULL, GFP_NOFS); 6530999df54SChris Mason return eb; 6540999df54SChris Mason } 6550999df54SChris Mason 6560999df54SChris Mason 657db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 658ca7a79adSChris Mason u32 blocksize, u64 parent_transid) 659e20d96d6SChris Mason { 6605f39d397SChris Mason struct extent_buffer *buf = NULL; 6615f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 662d1310b2eSChris Mason struct extent_io_tree *io_tree; 66319c00ddcSChris Mason int ret; 66419c00ddcSChris Mason 665d1310b2eSChris Mason io_tree = &BTRFS_I(btree_inode)->io_tree; 666e20d96d6SChris Mason 667db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 6685f39d397SChris Mason if (!buf) 669d98237b3SChris Mason return NULL; 670e4204dedSChris Mason 671ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 672ce9adaa5SChris Mason 673ce9adaa5SChris Mason if (ret == 0) { 674ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 675ce9adaa5SChris Mason } 6765f39d397SChris Mason return buf; 677ce9adaa5SChris Mason 678eb60ceacSChris Mason } 679eb60ceacSChris Mason 680e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 6815f39d397SChris Mason struct extent_buffer *buf) 682ed2ff2cbSChris Mason { 6835f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 68455c69072SChris Mason if (btrfs_header_generation(buf) == 685925baeddSChris Mason root->fs_info->running_transaction->transid) { 686925baeddSChris Mason WARN_ON(!btrfs_tree_locked(buf)); 687d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 68855c69072SChris Mason buf); 689925baeddSChris Mason } 6905f39d397SChris Mason return 0; 6915f39d397SChris Mason } 6925f39d397SChris Mason 6935f39d397SChris Mason int wait_on_tree_block_writeback(struct btrfs_root *root, 6945f39d397SChris Mason struct extent_buffer *buf) 6955f39d397SChris Mason { 6965f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 697d1310b2eSChris Mason wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree, 6985f39d397SChris Mason buf); 6995f39d397SChris Mason return 0; 7005f39d397SChris Mason } 7015f39d397SChris Mason 702db94535dSChris Mason static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 70387ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 7049f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 705e20d96d6SChris Mason u64 objectid) 706d97e63b6SChris Mason { 707cfaa7295SChris Mason root->node = NULL; 7080f7d52f4SChris Mason root->inode = NULL; 709a28ec197SChris Mason root->commit_root = NULL; 710db94535dSChris Mason root->sectorsize = sectorsize; 711db94535dSChris Mason root->nodesize = nodesize; 712db94535dSChris Mason root->leafsize = leafsize; 71387ee04ebSChris Mason root->stripesize = stripesize; 714123abc88SChris Mason root->ref_cows = 0; 7150b86a832SChris Mason root->track_dirty = 0; 7160b86a832SChris Mason 7179f5fae2fSChris Mason root->fs_info = fs_info; 7180f7d52f4SChris Mason root->objectid = objectid; 7190f7d52f4SChris Mason root->last_trans = 0; 7201b05da2eSChris Mason root->highest_inode = 0; 7211b05da2eSChris Mason root->last_inode_alloc = 0; 72258176a96SJosef Bacik root->name = NULL; 7234313b399SChris Mason root->in_sysfs = 0; 7240b86a832SChris Mason 7250b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 726925baeddSChris Mason spin_lock_init(&root->node_lock); 7273768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 7283768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 7296702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 73058176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 73158176a96SJosef Bacik init_completion(&root->kobj_unregister); 7326702ed49SChris Mason root->defrag_running = 0; 7336702ed49SChris Mason root->defrag_level = 0; 7344d775673SChris Mason root->root_key.objectid = objectid; 7353768f368SChris Mason return 0; 7363768f368SChris Mason } 7373768f368SChris Mason 738db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 7399f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 7409f5fae2fSChris Mason u64 objectid, 741e20d96d6SChris Mason struct btrfs_root *root) 7423768f368SChris Mason { 7433768f368SChris Mason int ret; 744db94535dSChris Mason u32 blocksize; 7453768f368SChris Mason 746db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 74787ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 74887ee04ebSChris Mason root, fs_info, objectid); 7493768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 7503768f368SChris Mason &root->root_item, &root->root_key); 7513768f368SChris Mason BUG_ON(ret); 7523768f368SChris Mason 753db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 754db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 755ca7a79adSChris Mason blocksize, 0); 7563768f368SChris Mason BUG_ON(!root->node); 757d97e63b6SChris Mason return 0; 758d97e63b6SChris Mason } 759d97e63b6SChris Mason 7605eda7b5eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info, 7610f7d52f4SChris Mason struct btrfs_key *location) 7620f7d52f4SChris Mason { 7630f7d52f4SChris Mason struct btrfs_root *root; 7640f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 7650f7d52f4SChris Mason struct btrfs_path *path; 7665f39d397SChris Mason struct extent_buffer *l; 7671b05da2eSChris Mason u64 highest_inode; 768db94535dSChris Mason u32 blocksize; 7690f7d52f4SChris Mason int ret = 0; 7700f7d52f4SChris Mason 7715eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 7720cf6c620SChris Mason if (!root) 7730f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 7740f7d52f4SChris Mason if (location->offset == (u64)-1) { 775db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 7760f7d52f4SChris Mason location->objectid, root); 7770f7d52f4SChris Mason if (ret) { 7780f7d52f4SChris Mason kfree(root); 7790f7d52f4SChris Mason return ERR_PTR(ret); 7800f7d52f4SChris Mason } 7810f7d52f4SChris Mason goto insert; 7820f7d52f4SChris Mason } 7830f7d52f4SChris Mason 784db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 78587ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 78687ee04ebSChris Mason root, fs_info, location->objectid); 7870f7d52f4SChris Mason 7880f7d52f4SChris Mason path = btrfs_alloc_path(); 7890f7d52f4SChris Mason BUG_ON(!path); 7900f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 7910f7d52f4SChris Mason if (ret != 0) { 7920f7d52f4SChris Mason if (ret > 0) 7930f7d52f4SChris Mason ret = -ENOENT; 7940f7d52f4SChris Mason goto out; 7950f7d52f4SChris Mason } 7965f39d397SChris Mason l = path->nodes[0]; 7975f39d397SChris Mason read_extent_buffer(l, &root->root_item, 7985f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 7990f7d52f4SChris Mason sizeof(root->root_item)); 80044b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 8010f7d52f4SChris Mason ret = 0; 8020f7d52f4SChris Mason out: 8030f7d52f4SChris Mason btrfs_release_path(root, path); 8040f7d52f4SChris Mason btrfs_free_path(path); 8050f7d52f4SChris Mason if (ret) { 8060f7d52f4SChris Mason kfree(root); 8070f7d52f4SChris Mason return ERR_PTR(ret); 8080f7d52f4SChris Mason } 809db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 810db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 811ca7a79adSChris Mason blocksize, 0); 8120f7d52f4SChris Mason BUG_ON(!root->node); 8130f7d52f4SChris Mason insert: 8140f7d52f4SChris Mason root->ref_cows = 1; 8155eda7b5eSChris Mason ret = btrfs_find_highest_inode(root, &highest_inode); 8165eda7b5eSChris Mason if (ret == 0) { 8175eda7b5eSChris Mason root->highest_inode = highest_inode; 8185eda7b5eSChris Mason root->last_inode_alloc = highest_inode; 8195eda7b5eSChris Mason } 8205eda7b5eSChris Mason return root; 8215eda7b5eSChris Mason } 8225eda7b5eSChris Mason 823dc17ff8fSChris Mason struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 824dc17ff8fSChris Mason u64 root_objectid) 825dc17ff8fSChris Mason { 826dc17ff8fSChris Mason struct btrfs_root *root; 827dc17ff8fSChris Mason 828dc17ff8fSChris Mason if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) 829dc17ff8fSChris Mason return fs_info->tree_root; 830dc17ff8fSChris Mason if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) 831dc17ff8fSChris Mason return fs_info->extent_root; 832dc17ff8fSChris Mason 833dc17ff8fSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 834dc17ff8fSChris Mason (unsigned long)root_objectid); 835dc17ff8fSChris Mason return root; 836dc17ff8fSChris Mason } 837dc17ff8fSChris Mason 838edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 839edbd8d4eSChris Mason struct btrfs_key *location) 8405eda7b5eSChris Mason { 8415eda7b5eSChris Mason struct btrfs_root *root; 8425eda7b5eSChris Mason int ret; 8435eda7b5eSChris Mason 844edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 845edbd8d4eSChris Mason return fs_info->tree_root; 846edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 847edbd8d4eSChris Mason return fs_info->extent_root; 8488f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 8498f18cf13SChris Mason return fs_info->chunk_root; 8508f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 8518f18cf13SChris Mason return fs_info->dev_root; 852edbd8d4eSChris Mason 8535eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 8545eda7b5eSChris Mason (unsigned long)location->objectid); 8555eda7b5eSChris Mason if (root) 8565eda7b5eSChris Mason return root; 8575eda7b5eSChris Mason 8585eda7b5eSChris Mason root = btrfs_read_fs_root_no_radix(fs_info, location); 8595eda7b5eSChris Mason if (IS_ERR(root)) 8605eda7b5eSChris Mason return root; 8612619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 8622619ba1fSChris Mason (unsigned long)root->root_key.objectid, 8630f7d52f4SChris Mason root); 8640f7d52f4SChris Mason if (ret) { 8655f39d397SChris Mason free_extent_buffer(root->node); 8660f7d52f4SChris Mason kfree(root); 8670f7d52f4SChris Mason return ERR_PTR(ret); 8680f7d52f4SChris Mason } 869edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 870edbd8d4eSChris Mason root->root_key.objectid, root); 871edbd8d4eSChris Mason BUG_ON(ret); 872edbd8d4eSChris Mason 873edbd8d4eSChris Mason return root; 874edbd8d4eSChris Mason } 875edbd8d4eSChris Mason 876edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 877edbd8d4eSChris Mason struct btrfs_key *location, 878edbd8d4eSChris Mason const char *name, int namelen) 879edbd8d4eSChris Mason { 880edbd8d4eSChris Mason struct btrfs_root *root; 881edbd8d4eSChris Mason int ret; 882edbd8d4eSChris Mason 883edbd8d4eSChris Mason root = btrfs_read_fs_root_no_name(fs_info, location); 884edbd8d4eSChris Mason if (!root) 885edbd8d4eSChris Mason return NULL; 88658176a96SJosef Bacik 8874313b399SChris Mason if (root->in_sysfs) 8884313b399SChris Mason return root; 8894313b399SChris Mason 89058176a96SJosef Bacik ret = btrfs_set_root_name(root, name, namelen); 89158176a96SJosef Bacik if (ret) { 8925f39d397SChris Mason free_extent_buffer(root->node); 89358176a96SJosef Bacik kfree(root); 89458176a96SJosef Bacik return ERR_PTR(ret); 89558176a96SJosef Bacik } 89658176a96SJosef Bacik 89758176a96SJosef Bacik ret = btrfs_sysfs_add_root(root); 89858176a96SJosef Bacik if (ret) { 8995f39d397SChris Mason free_extent_buffer(root->node); 90058176a96SJosef Bacik kfree(root->name); 90158176a96SJosef Bacik kfree(root); 90258176a96SJosef Bacik return ERR_PTR(ret); 90358176a96SJosef Bacik } 9044313b399SChris Mason root->in_sysfs = 1; 9050f7d52f4SChris Mason return root; 9060f7d52f4SChris Mason } 90719c00ddcSChris Mason #if 0 90819c00ddcSChris Mason static int add_hasher(struct btrfs_fs_info *info, char *type) { 90919c00ddcSChris Mason struct btrfs_hasher *hasher; 9100f7d52f4SChris Mason 91119c00ddcSChris Mason hasher = kmalloc(sizeof(*hasher), GFP_NOFS); 91219c00ddcSChris Mason if (!hasher) 91319c00ddcSChris Mason return -ENOMEM; 91419c00ddcSChris Mason hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC); 91519c00ddcSChris Mason if (!hasher->hash_tfm) { 91619c00ddcSChris Mason kfree(hasher); 91719c00ddcSChris Mason return -EINVAL; 91819c00ddcSChris Mason } 91919c00ddcSChris Mason spin_lock(&info->hash_lock); 92019c00ddcSChris Mason list_add(&hasher->list, &info->hashers); 92119c00ddcSChris Mason spin_unlock(&info->hash_lock); 92219c00ddcSChris Mason return 0; 92319c00ddcSChris Mason } 92419c00ddcSChris Mason #endif 92504160088SChris Mason 92604160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 92704160088SChris Mason { 92804160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 92904160088SChris Mason int ret = 0; 930cb03c743SChris Mason int limit = 256 * info->fs_devices->open_devices; 93104160088SChris Mason struct list_head *cur; 93204160088SChris Mason struct btrfs_device *device; 93304160088SChris Mason struct backing_dev_info *bdi; 93404160088SChris Mason 935cb03c743SChris Mason if ((bdi_bits & (1 << BDI_write_congested)) && 936cb03c743SChris Mason atomic_read(&info->nr_async_submits) > limit) { 937cb03c743SChris Mason return 1; 938cb03c743SChris Mason } 939cb03c743SChris Mason 94004160088SChris Mason list_for_each(cur, &info->fs_devices->devices) { 94104160088SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 942dfe25020SChris Mason if (!device->bdev) 943dfe25020SChris Mason continue; 94404160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 94504160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 94604160088SChris Mason ret = 1; 94704160088SChris Mason break; 94804160088SChris Mason } 94904160088SChris Mason } 95004160088SChris Mason return ret; 95104160088SChris Mason } 95204160088SChris Mason 95338b66988SChris Mason /* 95438b66988SChris Mason * this unplugs every device on the box, and it is only used when page 95538b66988SChris Mason * is null 95638b66988SChris Mason */ 95738b66988SChris Mason static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 95838b66988SChris Mason { 95938b66988SChris Mason struct list_head *cur; 96038b66988SChris Mason struct btrfs_device *device; 96138b66988SChris Mason struct btrfs_fs_info *info; 96238b66988SChris Mason 96338b66988SChris Mason info = (struct btrfs_fs_info *)bdi->unplug_io_data; 96438b66988SChris Mason list_for_each(cur, &info->fs_devices->devices) { 96538b66988SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 96638b66988SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 96738b66988SChris Mason if (bdi->unplug_io_fn) { 96838b66988SChris Mason bdi->unplug_io_fn(bdi, page); 96938b66988SChris Mason } 97038b66988SChris Mason } 97138b66988SChris Mason } 97238b66988SChris Mason 97304160088SChris Mason void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 97404160088SChris Mason { 97538b66988SChris Mason struct inode *inode; 976f2d8d74dSChris Mason struct extent_map_tree *em_tree; 977f2d8d74dSChris Mason struct extent_map *em; 978bcbfce8aSChris Mason struct address_space *mapping; 97938b66988SChris Mason u64 offset; 98038b66988SChris Mason 981bcbfce8aSChris Mason /* the generic O_DIRECT read code does this */ 98238b66988SChris Mason if (!page) { 98338b66988SChris Mason __unplug_io_fn(bdi, page); 98438b66988SChris Mason return; 98538b66988SChris Mason } 98638b66988SChris Mason 987bcbfce8aSChris Mason /* 988bcbfce8aSChris Mason * page->mapping may change at any time. Get a consistent copy 989bcbfce8aSChris Mason * and use that for everything below 990bcbfce8aSChris Mason */ 991bcbfce8aSChris Mason smp_mb(); 992bcbfce8aSChris Mason mapping = page->mapping; 993bcbfce8aSChris Mason if (!mapping) 994bcbfce8aSChris Mason return; 995bcbfce8aSChris Mason 996bcbfce8aSChris Mason inode = mapping->host; 99738b66988SChris Mason offset = page_offset(page); 99804160088SChris Mason 999f2d8d74dSChris Mason em_tree = &BTRFS_I(inode)->extent_tree; 1000f2d8d74dSChris Mason spin_lock(&em_tree->lock); 1001f2d8d74dSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 1002f2d8d74dSChris Mason spin_unlock(&em_tree->lock); 1003f2d8d74dSChris Mason if (!em) 1004f2d8d74dSChris Mason return; 1005f2d8d74dSChris Mason 1006f2d8d74dSChris Mason offset = offset - em->start; 1007f2d8d74dSChris Mason btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, 1008f2d8d74dSChris Mason em->block_start + offset, page); 1009f2d8d74dSChris Mason free_extent_map(em); 101004160088SChris Mason } 101104160088SChris Mason 101204160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 101304160088SChris Mason { 101451ebc0d3SJan Engelhardt #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) 101504160088SChris Mason bdi_init(bdi); 1016b248a415SChris Mason #endif 10174575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 101804160088SChris Mason bdi->state = 0; 101904160088SChris Mason bdi->capabilities = default_backing_dev_info.capabilities; 102004160088SChris Mason bdi->unplug_io_fn = btrfs_unplug_io_fn; 102104160088SChris Mason bdi->unplug_io_data = info; 102204160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 102304160088SChris Mason bdi->congested_data = info; 102404160088SChris Mason return 0; 102504160088SChris Mason } 102604160088SChris Mason 1027ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1028ce9adaa5SChris Mason { 1029ce9adaa5SChris Mason u64 length = 0; 1030ce9adaa5SChris Mason u64 buf_len = 0; 1031ce9adaa5SChris Mason u64 start = 0; 1032ce9adaa5SChris Mason struct page *page; 1033ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1034ce9adaa5SChris Mason struct btrfs_fs_info *info = NULL; 1035ce9adaa5SChris Mason struct bio_vec *bvec; 1036ce9adaa5SChris Mason int i; 1037ce9adaa5SChris Mason int ret; 1038ce9adaa5SChris Mason 1039ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1040ce9adaa5SChris Mason page = bvec->bv_page; 1041ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1042ce9adaa5SChris Mason length += bvec->bv_len; 1043ce9adaa5SChris Mason continue; 1044ce9adaa5SChris Mason } 1045ce9adaa5SChris Mason if (!page->private) { 1046ce9adaa5SChris Mason length += bvec->bv_len; 1047ce9adaa5SChris Mason continue; 1048ce9adaa5SChris Mason } 1049ce9adaa5SChris Mason length = bvec->bv_len; 1050ce9adaa5SChris Mason buf_len = page->private >> 2; 1051ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1052ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1053ce9adaa5SChris Mason info = BTRFS_I(page->mapping->host)->root->fs_info; 1054ce9adaa5SChris Mason } 1055ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1056ce9adaa5SChris Mason if (buf_len <= length) 1057ce9adaa5SChris Mason return 1; 1058ce9adaa5SChris Mason 1059ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1060ce9adaa5SChris Mason start + buf_len - 1); 1061ce9adaa5SChris Mason if (ret == 1) 1062ce9adaa5SChris Mason return ret; 1063ce9adaa5SChris Mason return ret; 1064ce9adaa5SChris Mason } 1065ce9adaa5SChris Mason 10668b712842SChris Mason /* 10678b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 10688b712842SChris Mason * functions. This is where read checksum verification actually happens 10698b712842SChris Mason */ 10708b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1071ce9adaa5SChris Mason { 1072ce9adaa5SChris Mason struct bio *bio; 10738b712842SChris Mason struct end_io_wq *end_io_wq; 10748b712842SChris Mason struct btrfs_fs_info *fs_info; 1075ce9adaa5SChris Mason int error; 1076ce9adaa5SChris Mason 10778b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1078ce9adaa5SChris Mason bio = end_io_wq->bio; 10798b712842SChris Mason fs_info = end_io_wq->info; 10808b712842SChris Mason 10818b712842SChris Mason /* metadata bios are special because the whole tree block must 10828b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 10838b712842SChris Mason * ram and up to date before trying to verify things. For 10848b712842SChris Mason * blocksize <= pagesize, it is basically a noop 10858b712842SChris Mason */ 108622c59948SChris Mason if (end_io_wq->metadata && !bio_ready_for_csum(bio)) { 10878b712842SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 10888b712842SChris Mason &end_io_wq->work); 1089ce9adaa5SChris Mason return; 1090ce9adaa5SChris Mason } 1091ce9adaa5SChris Mason error = end_io_wq->error; 1092ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1093ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1094ce9adaa5SChris Mason kfree(end_io_wq); 109573f61b2aSMiguel #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) 1096b248a415SChris Mason bio_endio(bio, bio->bi_size, error); 109773f61b2aSMiguel #else 1098ce9adaa5SChris Mason bio_endio(bio, error); 109973f61b2aSMiguel #endif 1100ce9adaa5SChris Mason } 110144b8bd7eSChris Mason 11028a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 1103dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1104dfe25020SChris Mason char *options) 1105eb60ceacSChris Mason { 1106db94535dSChris Mason u32 sectorsize; 1107db94535dSChris Mason u32 nodesize; 1108db94535dSChris Mason u32 leafsize; 1109db94535dSChris Mason u32 blocksize; 111087ee04ebSChris Mason u32 stripesize; 1111a061fc8dSChris Mason struct buffer_head *bh; 1112e20d96d6SChris Mason struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), 1113e20d96d6SChris Mason GFP_NOFS); 1114e20d96d6SChris Mason struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), 1115e20d96d6SChris Mason GFP_NOFS); 11168790d502SChris Mason struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), 1117e20d96d6SChris Mason GFP_NOFS); 11180b86a832SChris Mason struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root), 11190b86a832SChris Mason GFP_NOFS); 11200b86a832SChris Mason struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root), 11210b86a832SChris Mason GFP_NOFS); 1122eb60ceacSChris Mason int ret; 1123e58ca020SYan int err = -EINVAL; 11244543df7eSChris Mason 11252c90e5d6SChris Mason struct btrfs_super_block *disk_super; 11268790d502SChris Mason 112739279cc3SChris Mason if (!extent_root || !tree_root || !fs_info) { 112839279cc3SChris Mason err = -ENOMEM; 112939279cc3SChris Mason goto fail; 113039279cc3SChris Mason } 11310f7d52f4SChris Mason INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); 11328fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1133facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 113419c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 113519c00ddcSChris Mason spin_lock_init(&fs_info->hash_lock); 11361832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1137cee36a03SChris Mason spin_lock_init(&fs_info->new_trans_lock); 113819c00ddcSChris Mason 113958176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 11409f5fae2fSChris Mason fs_info->tree_root = tree_root; 11419f5fae2fSChris Mason fs_info->extent_root = extent_root; 11420b86a832SChris Mason fs_info->chunk_root = chunk_root; 11430b86a832SChris Mason fs_info->dev_root = dev_root; 11448a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 11450b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 11466324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 11470b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1148cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 1149e20d96d6SChris Mason fs_info->sb = sb; 1150c59f8951SChris Mason fs_info->max_extent = (u64)-1; 11516f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 115204160088SChris Mason setup_bdi(fs_info, &fs_info->bdi); 1153d98237b3SChris Mason fs_info->btree_inode = new_inode(sb); 1154d98237b3SChris Mason fs_info->btree_inode->i_ino = 1; 11552c90e5d6SChris Mason fs_info->btree_inode->i_nlink = 1; 11564543df7eSChris Mason fs_info->thread_pool_size = min(num_online_cpus() + 2, 8); 11570afbaf8cSChris Mason 1158a061fc8dSChris Mason sb->s_blocksize = 4096; 1159a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 1160a061fc8dSChris Mason 11610afbaf8cSChris Mason /* 11620afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 11630afbaf8cSChris Mason * the real end of the address space is determined by all of 11640afbaf8cSChris Mason * the devices in the system 11650afbaf8cSChris Mason */ 11660afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 1167d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 116804160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 116904160088SChris Mason 1170d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 11715f39d397SChris Mason fs_info->btree_inode->i_mapping, 11725f39d397SChris Mason GFP_NOFS); 1173d1310b2eSChris Mason extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, 1174d1310b2eSChris Mason GFP_NOFS); 11750da5468fSChris Mason 1176d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 1177d1310b2eSChris Mason 1178d1310b2eSChris Mason extent_io_tree_init(&fs_info->free_space_cache, 1179f510cfecSChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1180d1310b2eSChris Mason extent_io_tree_init(&fs_info->block_group_cache, 118196b5179dSChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1182d1310b2eSChris Mason extent_io_tree_init(&fs_info->pinned_extents, 11831a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1184d1310b2eSChris Mason extent_io_tree_init(&fs_info->pending_del, 11851a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1186d1310b2eSChris Mason extent_io_tree_init(&fs_info->extent_ins, 11871a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1188e66f709bSChris Mason fs_info->do_barriers = 1; 1189e18e4809SChris Mason 11906da6abaeSChris Mason #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) 11916da6abaeSChris Mason INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info); 11926da6abaeSChris Mason #else 119308607c1bSChris Mason INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner); 11946da6abaeSChris Mason #endif 11950f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 11960f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 11970f7d52f4SChris Mason sizeof(struct btrfs_key)); 119822b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 1199d98237b3SChris Mason mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); 120039279cc3SChris Mason 120179154b1bSChris Mason mutex_init(&fs_info->trans_mutex); 1202d561c025SChris Mason mutex_init(&fs_info->fs_mutex); 1203925baeddSChris Mason mutex_init(&fs_info->alloc_mutex); 1204925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 12053768f368SChris Mason 120619c00ddcSChris Mason #if 0 120719c00ddcSChris Mason ret = add_hasher(fs_info, "crc32c"); 120819c00ddcSChris Mason if (ret) { 120919c00ddcSChris Mason printk("btrfs: failed hash setup, modprobe cryptomgr?\n"); 121019c00ddcSChris Mason err = -ENOMEM; 121119c00ddcSChris Mason goto fail_iput; 121219c00ddcSChris Mason } 121319c00ddcSChris Mason #endif 12140b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 12152c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 12167eccb903SChris Mason 1217d98237b3SChris Mason 1218a061fc8dSChris Mason bh = __bread(fs_devices->latest_bdev, 1219a061fc8dSChris Mason BTRFS_SUPER_INFO_OFFSET / 4096, 4096); 1220a061fc8dSChris Mason if (!bh) 122139279cc3SChris Mason goto fail_iput; 122239279cc3SChris Mason 1223a061fc8dSChris Mason memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); 1224a061fc8dSChris Mason brelse(bh); 12255f39d397SChris Mason 1226a061fc8dSChris Mason memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); 12270b86a832SChris Mason 12285f39d397SChris Mason disk_super = &fs_info->super_copy; 12290f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 123039279cc3SChris Mason goto fail_sb_buffer; 12310f7d52f4SChris Mason 1232edf24abeSChristoph Hellwig err = btrfs_parse_options(tree_root, options); 1233edf24abeSChristoph Hellwig if (err) 1234edf24abeSChristoph Hellwig goto fail_sb_buffer; 1235dfe25020SChris Mason 12364543df7eSChris Mason /* 12374543df7eSChris Mason * we need to start all the end_io workers up front because the 12384543df7eSChris Mason * queue work function gets called at interrupt time, and so it 12394543df7eSChris Mason * cannot dynamically grow. 12404543df7eSChris Mason */ 12414543df7eSChris Mason btrfs_init_workers(&fs_info->workers, fs_info->thread_pool_size); 12421cc127b5SChris Mason btrfs_init_workers(&fs_info->submit_workers, fs_info->thread_pool_size); 12434543df7eSChris Mason btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size); 12444543df7eSChris Mason btrfs_start_workers(&fs_info->workers, 1); 12451cc127b5SChris Mason btrfs_start_workers(&fs_info->submit_workers, 1); 12464543df7eSChris Mason btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size); 12474543df7eSChris Mason 12484543df7eSChris Mason 1249edf24abeSChristoph Hellwig err = -EINVAL; 1250a0af469bSChris Mason if (btrfs_super_num_devices(disk_super) > fs_devices->open_devices) { 12518a4b83ccSChris Mason printk("Btrfs: wanted %llu devices, but found %llu\n", 12528a4b83ccSChris Mason (unsigned long long)btrfs_super_num_devices(disk_super), 1253a0af469bSChris Mason (unsigned long long)fs_devices->open_devices); 1254dfe25020SChris Mason if (btrfs_test_opt(tree_root, DEGRADED)) 1255dfe25020SChris Mason printk("continuing in degraded mode\n"); 1256dfe25020SChris Mason else { 12578a4b83ccSChris Mason goto fail_sb_buffer; 12588a4b83ccSChris Mason } 1259dfe25020SChris Mason } 1260dfe25020SChris Mason 12614575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 12624575c9ccSChris Mason 1263db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 1264db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 1265db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 126687ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 1267db94535dSChris Mason tree_root->nodesize = nodesize; 1268db94535dSChris Mason tree_root->leafsize = leafsize; 1269db94535dSChris Mason tree_root->sectorsize = sectorsize; 127087ee04ebSChris Mason tree_root->stripesize = stripesize; 1271a061fc8dSChris Mason 1272a061fc8dSChris Mason sb->s_blocksize = sectorsize; 1273a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 1274db94535dSChris Mason 127539279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 127639279cc3SChris Mason sizeof(disk_super->magic))) { 127739279cc3SChris Mason printk("btrfs: valid FS not found on %s\n", sb->s_id); 127839279cc3SChris Mason goto fail_sb_buffer; 127939279cc3SChris Mason } 128019c00ddcSChris Mason 12810b86a832SChris Mason mutex_lock(&fs_info->fs_mutex); 12820d81ba5dSChris Mason 1283925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 12840b86a832SChris Mason ret = btrfs_read_sys_array(tree_root); 1285925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 128684eed90fSChris Mason if (ret) { 128784eed90fSChris Mason printk("btrfs: failed to read the system array on %s\n", 128884eed90fSChris Mason sb->s_id); 128984eed90fSChris Mason goto fail_sys_array; 129084eed90fSChris Mason } 12910b86a832SChris Mason 12920b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 12930b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 12940b86a832SChris Mason 12950b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 12960b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 12970b86a832SChris Mason 12980b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 12990b86a832SChris Mason btrfs_super_chunk_root(disk_super), 1300ca7a79adSChris Mason blocksize, 0); 13010b86a832SChris Mason BUG_ON(!chunk_root->node); 13020b86a832SChris Mason 1303e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 1304e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 1305e17cade2SChris Mason BTRFS_UUID_SIZE); 1306e17cade2SChris Mason 1307925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 13080b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 1309925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 13100b86a832SChris Mason BUG_ON(ret); 13110b86a832SChris Mason 1312dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 1313dfe25020SChris Mason 1314db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 1315db94535dSChris Mason btrfs_super_root_level(disk_super)); 131619c00ddcSChris Mason 13170b86a832SChris Mason 1318e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 1319db94535dSChris Mason btrfs_super_root(disk_super), 1320ca7a79adSChris Mason blocksize, 0); 132139279cc3SChris Mason if (!tree_root->node) 132239279cc3SChris Mason goto fail_sb_buffer; 13233768f368SChris Mason 1324db94535dSChris Mason 1325db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 1326e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 13270b86a832SChris Mason if (ret) 132839279cc3SChris Mason goto fail_tree_root; 13290b86a832SChris Mason extent_root->track_dirty = 1; 13300b86a832SChris Mason 13310b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 13320b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 13330b86a832SChris Mason dev_root->track_dirty = 1; 13340b86a832SChris Mason 13350b86a832SChris Mason if (ret) 13360b86a832SChris Mason goto fail_extent_root; 13373768f368SChris Mason 13389078a3e1SChris Mason btrfs_read_block_groups(extent_root); 13399078a3e1SChris Mason 13400f7d52f4SChris Mason fs_info->generation = btrfs_super_generation(disk_super) + 1; 1341d18a2c44SChris Mason fs_info->data_alloc_profile = (u64)-1; 1342d18a2c44SChris Mason fs_info->metadata_alloc_profile = (u64)-1; 1343611f0e00SChris Mason fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 1344d18a2c44SChris Mason 13455be6f7f1SChris Mason mutex_unlock(&fs_info->fs_mutex); 13460f7d52f4SChris Mason return tree_root; 134739279cc3SChris Mason 13480b86a832SChris Mason fail_extent_root: 13490b86a832SChris Mason free_extent_buffer(extent_root->node); 135039279cc3SChris Mason fail_tree_root: 13515f39d397SChris Mason free_extent_buffer(tree_root->node); 135284eed90fSChris Mason fail_sys_array: 135384eed90fSChris Mason mutex_unlock(&fs_info->fs_mutex); 135439279cc3SChris Mason fail_sb_buffer: 13552d2ae547SChris Mason extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree); 13568b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 13578b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 13581cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 13594543df7eSChris Mason fail_iput: 13604543df7eSChris Mason iput(fs_info->btree_inode); 136139279cc3SChris Mason fail: 1362dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 136384eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 136484eed90fSChris Mason 136539279cc3SChris Mason kfree(extent_root); 136639279cc3SChris Mason kfree(tree_root); 136751ebc0d3SJan Engelhardt #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) 13682d2ae547SChris Mason bdi_destroy(&fs_info->bdi); 1369b248a415SChris Mason #endif 137039279cc3SChris Mason kfree(fs_info); 137139279cc3SChris Mason return ERR_PTR(err); 1372eb60ceacSChris Mason } 1373eb60ceacSChris Mason 1374f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 1375f2984462SChris Mason { 1376f2984462SChris Mason char b[BDEVNAME_SIZE]; 1377f2984462SChris Mason 1378f2984462SChris Mason if (uptodate) { 1379f2984462SChris Mason set_buffer_uptodate(bh); 1380f2984462SChris Mason } else { 1381f2984462SChris Mason if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { 1382f2984462SChris Mason printk(KERN_WARNING "lost page write due to " 1383f2984462SChris Mason "I/O error on %s\n", 1384f2984462SChris Mason bdevname(bh->b_bdev, b)); 1385f2984462SChris Mason } 13861259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 13871259ab75SChris Mason * our own ways of dealing with the IO errors 13881259ab75SChris Mason */ 1389f2984462SChris Mason clear_buffer_uptodate(bh); 1390f2984462SChris Mason } 1391f2984462SChris Mason unlock_buffer(bh); 1392f2984462SChris Mason put_bh(bh); 1393f2984462SChris Mason } 1394f2984462SChris Mason 1395f2984462SChris Mason int write_all_supers(struct btrfs_root *root) 1396f2984462SChris Mason { 1397f2984462SChris Mason struct list_head *cur; 1398f2984462SChris Mason struct list_head *head = &root->fs_info->fs_devices->devices; 1399f2984462SChris Mason struct btrfs_device *dev; 1400a061fc8dSChris Mason struct btrfs_super_block *sb; 1401f2984462SChris Mason struct btrfs_dev_item *dev_item; 1402f2984462SChris Mason struct buffer_head *bh; 1403f2984462SChris Mason int ret; 1404f2984462SChris Mason int do_barriers; 1405a236aed1SChris Mason int max_errors; 1406a236aed1SChris Mason int total_errors = 0; 1407a061fc8dSChris Mason u32 crc; 1408a061fc8dSChris Mason u64 flags; 1409f2984462SChris Mason 1410a236aed1SChris Mason max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; 1411f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 1412f2984462SChris Mason 1413a061fc8dSChris Mason sb = &root->fs_info->super_for_commit; 1414a061fc8dSChris Mason dev_item = &sb->dev_item; 1415f2984462SChris Mason list_for_each(cur, head) { 1416f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1417dfe25020SChris Mason if (!dev->bdev) { 1418dfe25020SChris Mason total_errors++; 1419dfe25020SChris Mason continue; 1420dfe25020SChris Mason } 1421dfe25020SChris Mason if (!dev->in_fs_metadata) 1422dfe25020SChris Mason continue; 1423dfe25020SChris Mason 1424a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 1425a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 1426a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 1427a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 1428a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 1429a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 1430a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 1431a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 1432a061fc8dSChris Mason flags = btrfs_super_flags(sb); 1433a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 1434f2984462SChris Mason 1435f2984462SChris Mason 1436a061fc8dSChris Mason crc = ~(u32)0; 1437a061fc8dSChris Mason crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc, 1438a061fc8dSChris Mason BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); 1439a061fc8dSChris Mason btrfs_csum_final(crc, sb->csum); 1440a061fc8dSChris Mason 1441a061fc8dSChris Mason bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 1442f2984462SChris Mason BTRFS_SUPER_INFO_SIZE); 1443f2984462SChris Mason 1444a061fc8dSChris Mason memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 1445f2984462SChris Mason dev->pending_io = bh; 1446f2984462SChris Mason 1447f2984462SChris Mason get_bh(bh); 1448f2984462SChris Mason set_buffer_uptodate(bh); 1449f2984462SChris Mason lock_buffer(bh); 1450f2984462SChris Mason bh->b_end_io = btrfs_end_buffer_write_sync; 1451f2984462SChris Mason 1452f2984462SChris Mason if (do_barriers && dev->barriers) { 1453f2984462SChris Mason ret = submit_bh(WRITE_BARRIER, bh); 1454f2984462SChris Mason if (ret == -EOPNOTSUPP) { 1455f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1456f2984462SChris Mason dev->name); 1457f2984462SChris Mason set_buffer_uptodate(bh); 1458f2984462SChris Mason dev->barriers = 0; 1459f2984462SChris Mason get_bh(bh); 1460f2984462SChris Mason lock_buffer(bh); 1461f2984462SChris Mason ret = submit_bh(WRITE, bh); 1462f2984462SChris Mason } 1463f2984462SChris Mason } else { 1464f2984462SChris Mason ret = submit_bh(WRITE, bh); 1465f2984462SChris Mason } 1466a236aed1SChris Mason if (ret) 1467a236aed1SChris Mason total_errors++; 1468f2984462SChris Mason } 1469a236aed1SChris Mason if (total_errors > max_errors) { 1470a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1471a236aed1SChris Mason BUG(); 1472a236aed1SChris Mason } 1473a236aed1SChris Mason total_errors = 0; 1474f2984462SChris Mason 1475f2984462SChris Mason list_for_each(cur, head) { 1476f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1477dfe25020SChris Mason if (!dev->bdev) 1478dfe25020SChris Mason continue; 1479dfe25020SChris Mason if (!dev->in_fs_metadata) 1480dfe25020SChris Mason continue; 1481dfe25020SChris Mason 1482f2984462SChris Mason BUG_ON(!dev->pending_io); 1483f2984462SChris Mason bh = dev->pending_io; 1484f2984462SChris Mason wait_on_buffer(bh); 1485f2984462SChris Mason if (!buffer_uptodate(dev->pending_io)) { 1486f2984462SChris Mason if (do_barriers && dev->barriers) { 1487f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1488f2984462SChris Mason dev->name); 1489f2984462SChris Mason set_buffer_uptodate(bh); 1490f2984462SChris Mason get_bh(bh); 1491f2984462SChris Mason lock_buffer(bh); 1492f2984462SChris Mason dev->barriers = 0; 1493f2984462SChris Mason ret = submit_bh(WRITE, bh); 1494f2984462SChris Mason BUG_ON(ret); 1495f2984462SChris Mason wait_on_buffer(bh); 14961259ab75SChris Mason if (!buffer_uptodate(bh)) 14971259ab75SChris Mason total_errors++; 1498f2984462SChris Mason } else { 1499a236aed1SChris Mason total_errors++; 1500f2984462SChris Mason } 1501f2984462SChris Mason 1502f2984462SChris Mason } 1503f2984462SChris Mason dev->pending_io = NULL; 1504f2984462SChris Mason brelse(bh); 1505f2984462SChris Mason } 1506a236aed1SChris Mason if (total_errors > max_errors) { 1507a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1508a236aed1SChris Mason BUG(); 1509a236aed1SChris Mason } 1510f2984462SChris Mason return 0; 1511f2984462SChris Mason } 1512f2984462SChris Mason 1513e089f05cSChris Mason int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root 151479154b1bSChris Mason *root) 1515cfaa7295SChris Mason { 1516e66f709bSChris Mason int ret; 15172c90e5d6SChris Mason 1518f2984462SChris Mason ret = write_all_supers(root); 15195f39d397SChris Mason return ret; 1520cfaa7295SChris Mason } 1521cfaa7295SChris Mason 15225eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 15232619ba1fSChris Mason { 15242619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 15252619ba1fSChris Mason (unsigned long)root->root_key.objectid); 1526b99aa6cbSChris Mason if (root->in_sysfs) 152758176a96SJosef Bacik btrfs_sysfs_del_root(root); 15282619ba1fSChris Mason if (root->inode) 15292619ba1fSChris Mason iput(root->inode); 15302619ba1fSChris Mason if (root->node) 15315f39d397SChris Mason free_extent_buffer(root->node); 15322619ba1fSChris Mason if (root->commit_root) 15335f39d397SChris Mason free_extent_buffer(root->commit_root); 153458176a96SJosef Bacik if (root->name) 153558176a96SJosef Bacik kfree(root->name); 15362619ba1fSChris Mason kfree(root); 15372619ba1fSChris Mason return 0; 15382619ba1fSChris Mason } 15392619ba1fSChris Mason 154035b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 15410f7d52f4SChris Mason { 15420f7d52f4SChris Mason int ret; 15430f7d52f4SChris Mason struct btrfs_root *gang[8]; 15440f7d52f4SChris Mason int i; 15450f7d52f4SChris Mason 15460f7d52f4SChris Mason while(1) { 15470f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 15480f7d52f4SChris Mason (void **)gang, 0, 15490f7d52f4SChris Mason ARRAY_SIZE(gang)); 15500f7d52f4SChris Mason if (!ret) 15510f7d52f4SChris Mason break; 15522619ba1fSChris Mason for (i = 0; i < ret; i++) 15535eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 15540f7d52f4SChris Mason } 15550f7d52f4SChris Mason return 0; 15560f7d52f4SChris Mason } 1557b4100d64SChris Mason 1558e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 1559eb60ceacSChris Mason { 15603768f368SChris Mason int ret; 1561e089f05cSChris Mason struct btrfs_trans_handle *trans; 15620f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 1563e089f05cSChris Mason 1564facda1e7SChris Mason fs_info->closing = 1; 156508607c1bSChris Mason btrfs_transaction_flush_work(root); 15660f7d52f4SChris Mason mutex_lock(&fs_info->fs_mutex); 15676702ed49SChris Mason btrfs_defrag_dirty_roots(root->fs_info); 156879154b1bSChris Mason trans = btrfs_start_transaction(root, 1); 156954aa1f4dSChris Mason ret = btrfs_commit_transaction(trans, root); 157079154b1bSChris Mason /* run commit again to drop the original snapshot */ 157179154b1bSChris Mason trans = btrfs_start_transaction(root, 1); 157279154b1bSChris Mason btrfs_commit_transaction(trans, root); 157379154b1bSChris Mason ret = btrfs_write_and_wait_transaction(NULL, root); 15749f5fae2fSChris Mason BUG_ON(ret); 1575d6bfde87SChris Mason 157679154b1bSChris Mason write_ctree_super(NULL, root); 15770f7d52f4SChris Mason mutex_unlock(&fs_info->fs_mutex); 1578ed2ff2cbSChris Mason 15799ad6b7bcSChris Mason btrfs_transaction_flush_work(root); 15809ad6b7bcSChris Mason 1581b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 1582b0c68f8bSChris Mason printk("btrfs: at unmount delalloc count %Lu\n", 1583b0c68f8bSChris Mason fs_info->delalloc_bytes); 1584b0c68f8bSChris Mason } 15850f7d52f4SChris Mason if (fs_info->extent_root->node) 15865f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 1587f510cfecSChris Mason 15880f7d52f4SChris Mason if (fs_info->tree_root->node) 15895f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 1590f510cfecSChris Mason 15910b86a832SChris Mason if (root->fs_info->chunk_root->node); 15920b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 15930b86a832SChris Mason 15940b86a832SChris Mason if (root->fs_info->dev_root->node); 15950b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 15960b86a832SChris Mason 15979078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 15980f7d52f4SChris Mason del_fs_roots(fs_info); 1599d10c5f31SChris Mason 1600d10c5f31SChris Mason filemap_write_and_wait(fs_info->btree_inode->i_mapping); 1601d10c5f31SChris Mason 1602d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->free_space_cache); 1603d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->block_group_cache); 1604d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->pinned_extents); 1605d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->pending_del); 1606d1310b2eSChris Mason extent_io_tree_empty_lru(&fs_info->extent_ins); 1607d1310b2eSChris Mason extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree); 1608d10c5f31SChris Mason 1609db94535dSChris Mason truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); 16109ad6b7bcSChris Mason 16118b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 16128b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 16131cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 1614d6bfde87SChris Mason 1615db94535dSChris Mason iput(fs_info->btree_inode); 161619c00ddcSChris Mason #if 0 161719c00ddcSChris Mason while(!list_empty(&fs_info->hashers)) { 161819c00ddcSChris Mason struct btrfs_hasher *hasher; 161919c00ddcSChris Mason hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher, 162019c00ddcSChris Mason hashers); 162119c00ddcSChris Mason list_del(&hasher->hashers); 162219c00ddcSChris Mason crypto_free_hash(&fs_info->hash_tfm); 162319c00ddcSChris Mason kfree(hasher); 162419c00ddcSChris Mason } 162519c00ddcSChris Mason #endif 1626dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 16270b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 1628b248a415SChris Mason 162951ebc0d3SJan Engelhardt #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) 163004160088SChris Mason bdi_destroy(&fs_info->bdi); 1631b248a415SChris Mason #endif 16320b86a832SChris Mason 16330f7d52f4SChris Mason kfree(fs_info->extent_root); 16340f7d52f4SChris Mason kfree(fs_info->tree_root); 16350b86a832SChris Mason kfree(fs_info->chunk_root); 16360b86a832SChris Mason kfree(fs_info->dev_root); 1637eb60ceacSChris Mason return 0; 1638eb60ceacSChris Mason } 1639eb60ceacSChris Mason 16401259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 1641ccd467d6SChris Mason { 16421259ab75SChris Mason int ret; 1643810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 16441259ab75SChris Mason 16451259ab75SChris Mason ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); 16461259ab75SChris Mason if (!ret) 16471259ab75SChris Mason return ret; 16481259ab75SChris Mason 16491259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 16501259ab75SChris Mason parent_transid); 16511259ab75SChris Mason return !ret; 16525f39d397SChris Mason } 16536702ed49SChris Mason 16545f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 16555f39d397SChris Mason { 1656810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 1657d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 16585f39d397SChris Mason buf); 16595f39d397SChris Mason } 16605f39d397SChris Mason 16615f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 16625f39d397SChris Mason { 1663810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 16645f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 16655f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 16666702ed49SChris Mason 1667925baeddSChris Mason WARN_ON(!btrfs_tree_locked(buf)); 1668ccd467d6SChris Mason if (transid != root->fs_info->generation) { 1669ccd467d6SChris Mason printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", 1670db94535dSChris Mason (unsigned long long)buf->start, 1671ccd467d6SChris Mason transid, root->fs_info->generation); 1672ccd467d6SChris Mason WARN_ON(1); 1673ccd467d6SChris Mason } 1674d1310b2eSChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); 1675eb60ceacSChris Mason } 1676eb60ceacSChris Mason 1677e2008b61SChris Mason void btrfs_throttle(struct btrfs_root *root) 1678e2008b61SChris Mason { 167955c69072SChris Mason struct backing_dev_info *bdi; 168055c69072SChris Mason 1681a061fc8dSChris Mason bdi = &root->fs_info->bdi; 168204005cc7SChris Mason if (root->fs_info->throttles && bdi_write_congested(bdi)) { 168304005cc7SChris Mason #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18) 168455c69072SChris Mason congestion_wait(WRITE, HZ/20); 168504005cc7SChris Mason #else 168604005cc7SChris Mason blk_congestion_wait(WRITE, HZ/20); 168704005cc7SChris Mason #endif 168804005cc7SChris Mason } 1689e2008b61SChris Mason } 1690e2008b61SChris Mason 1691d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 169235b7e476SChris Mason { 1693188de649SChris Mason /* 1694188de649SChris Mason * looks as though older kernels can get into trouble with 1695188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 1696188de649SChris Mason */ 1697d6bfde87SChris Mason struct extent_io_tree *tree; 1698d6bfde87SChris Mason u64 num_dirty; 1699d6bfde87SChris Mason u64 start = 0; 1700d6bfde87SChris Mason unsigned long thresh = 16 * 1024 * 1024; 1701d6bfde87SChris Mason tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 1702d6bfde87SChris Mason 1703d6bfde87SChris Mason if (current_is_pdflush()) 1704d6bfde87SChris Mason return; 1705d6bfde87SChris Mason 1706d6bfde87SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 1707d6bfde87SChris Mason thresh, EXTENT_DIRTY); 1708d6bfde87SChris Mason if (num_dirty > thresh) { 1709d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 1710304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 171135b7e476SChris Mason } 1712188de649SChris Mason return; 1713d6bfde87SChris Mason } 17146b80053dSChris Mason 17156b80053dSChris Mason void btrfs_set_buffer_defrag(struct extent_buffer *buf) 17166b80053dSChris Mason { 1717810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17186b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1719d1310b2eSChris Mason set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start, 17206b80053dSChris Mason buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS); 17216b80053dSChris Mason } 17226b80053dSChris Mason 17236b80053dSChris Mason void btrfs_set_buffer_defrag_done(struct extent_buffer *buf) 17246b80053dSChris Mason { 1725810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17266b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1727d1310b2eSChris Mason set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start, 17286b80053dSChris Mason buf->start + buf->len - 1, EXTENT_DEFRAG_DONE, 17296b80053dSChris Mason GFP_NOFS); 17306b80053dSChris Mason } 17316b80053dSChris Mason 17326b80053dSChris Mason int btrfs_buffer_defrag(struct extent_buffer *buf) 17336b80053dSChris Mason { 1734810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17356b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1736d1310b2eSChris Mason return test_range_bit(&BTRFS_I(btree_inode)->io_tree, 17376b80053dSChris Mason buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0); 17386b80053dSChris Mason } 17396b80053dSChris Mason 17406b80053dSChris Mason int btrfs_buffer_defrag_done(struct extent_buffer *buf) 17416b80053dSChris Mason { 1742810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17436b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1744d1310b2eSChris Mason return test_range_bit(&BTRFS_I(btree_inode)->io_tree, 17456b80053dSChris Mason buf->start, buf->start + buf->len - 1, 17466b80053dSChris Mason EXTENT_DEFRAG_DONE, 0); 17476b80053dSChris Mason } 17486b80053dSChris Mason 17496b80053dSChris Mason int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf) 17506b80053dSChris Mason { 1751810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17526b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1753d1310b2eSChris Mason return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree, 17546b80053dSChris Mason buf->start, buf->start + buf->len - 1, 17556b80053dSChris Mason EXTENT_DEFRAG_DONE, GFP_NOFS); 17566b80053dSChris Mason } 17576b80053dSChris Mason 17586b80053dSChris Mason int btrfs_clear_buffer_defrag(struct extent_buffer *buf) 17596b80053dSChris Mason { 1760810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 17616b80053dSChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 1762d1310b2eSChris Mason return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree, 17636b80053dSChris Mason buf->start, buf->start + buf->len - 1, 17646b80053dSChris Mason EXTENT_DEFRAG, GFP_NOFS); 17656b80053dSChris Mason } 17666b80053dSChris Mason 1767ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 17686b80053dSChris Mason { 1769810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 1770ce9adaa5SChris Mason int ret; 1771ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 1772ce9adaa5SChris Mason if (ret == 0) { 1773ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 1774ce9adaa5SChris Mason } 1775ce9adaa5SChris Mason return ret; 17766b80053dSChris Mason } 17770da5468fSChris Mason 1778d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 17790da5468fSChris Mason .writepage_io_hook = btree_writepage_io_hook, 1780ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 17810b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 1782239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 1783239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 17840da5468fSChris Mason }; 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