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 19a74a4b97SChris Mason #include <linux/version.h> 20e20d96d6SChris Mason #include <linux/fs.h> 21d98237b3SChris Mason #include <linux/blkdev.h> 2287cbda5cSChris Mason #include <linux/scatterlist.h> 2322b0ebdaSChris Mason #include <linux/swap.h> 240f7d52f4SChris Mason #include <linux/radix-tree.h> 2535b7e476SChris Mason #include <linux/writeback.h> 265f39d397SChris Mason #include <linux/buffer_head.h> // for block_sync_page 27ce9adaa5SChris Mason #include <linux/workqueue.h> 28a74a4b97SChris Mason #include <linux/kthread.h> 29a74a4b97SChris Mason # include <linux/freezer.h> 30a5eb62e3SMiguel #include "crc32c.h" 31eb60ceacSChris Mason #include "ctree.h" 32eb60ceacSChris Mason #include "disk-io.h" 33e089f05cSChris Mason #include "transaction.h" 340f7d52f4SChris Mason #include "btrfs_inode.h" 350b86a832SChris Mason #include "volumes.h" 36db94535dSChris Mason #include "print-tree.h" 378b712842SChris Mason #include "async-thread.h" 38925baeddSChris Mason #include "locking.h" 39017e5369SChris Mason #include "ref-cache.h" 40e02119d5SChris Mason #include "tree-log.h" 41eb60ceacSChris Mason 425f39d397SChris Mason #if 0 435f39d397SChris Mason static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) 447eccb903SChris Mason { 455f39d397SChris Mason if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) { 465f39d397SChris Mason printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n", 475f39d397SChris Mason (unsigned long long)extent_buffer_blocknr(buf), 485f39d397SChris Mason (unsigned long long)btrfs_header_blocknr(buf)); 4939279cc3SChris Mason return 1; 50d98237b3SChris Mason } 519a8dd150SChris Mason return 0; 52eb60ceacSChris Mason } 535f39d397SChris Mason #endif 54eb60ceacSChris Mason 55d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops; 568b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work); 57ce9adaa5SChris Mason 58d352ac68SChris Mason /* 59d352ac68SChris Mason * end_io_wq structs are used to do processing in task context when an IO is 60d352ac68SChris Mason * complete. This is used during reads to verify checksums, and it is used 61d352ac68SChris Mason * by writes to insert metadata for new file extents after IO is complete. 62d352ac68SChris Mason */ 63ce9adaa5SChris Mason struct end_io_wq { 64ce9adaa5SChris Mason struct bio *bio; 65ce9adaa5SChris Mason bio_end_io_t *end_io; 66ce9adaa5SChris Mason void *private; 67ce9adaa5SChris Mason struct btrfs_fs_info *info; 68ce9adaa5SChris Mason int error; 6922c59948SChris Mason int metadata; 70ce9adaa5SChris Mason struct list_head list; 718b712842SChris Mason struct btrfs_work work; 72ce9adaa5SChris Mason }; 730da5468fSChris Mason 74d352ac68SChris Mason /* 75d352ac68SChris Mason * async submit bios are used to offload expensive checksumming 76d352ac68SChris Mason * onto the worker threads. They checksum file and metadata bios 77d352ac68SChris Mason * just before they are sent down the IO stack. 78d352ac68SChris Mason */ 7944b8bd7eSChris Mason struct async_submit_bio { 8044b8bd7eSChris Mason struct inode *inode; 8144b8bd7eSChris Mason struct bio *bio; 8244b8bd7eSChris Mason struct list_head list; 834a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start; 844a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done; 8544b8bd7eSChris Mason int rw; 8644b8bd7eSChris Mason int mirror_num; 87c8b97818SChris Mason unsigned long bio_flags; 888b712842SChris Mason struct btrfs_work work; 8944b8bd7eSChris Mason }; 9044b8bd7eSChris Mason 91d352ac68SChris Mason /* 92d352ac68SChris Mason * extents on the btree inode are pretty simple, there's one extent 93d352ac68SChris Mason * that covers the entire device 94d352ac68SChris Mason */ 955f39d397SChris Mason struct extent_map *btree_get_extent(struct inode *inode, struct page *page, 96d1310b2eSChris Mason size_t page_offset, u64 start, u64 len, 975f39d397SChris Mason int create) 985f39d397SChris Mason { 995f39d397SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1005f39d397SChris Mason struct extent_map *em; 1015f39d397SChris Mason int ret; 1025f39d397SChris Mason 103d1310b2eSChris Mason spin_lock(&em_tree->lock); 104d1310b2eSChris Mason em = lookup_extent_mapping(em_tree, start, len); 105a061fc8dSChris Mason if (em) { 106a061fc8dSChris Mason em->bdev = 107a061fc8dSChris Mason BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 108d1310b2eSChris Mason spin_unlock(&em_tree->lock); 1095f39d397SChris Mason goto out; 110a061fc8dSChris Mason } 111a061fc8dSChris Mason spin_unlock(&em_tree->lock); 1127b13b7b1SChris Mason 1135f39d397SChris Mason em = alloc_extent_map(GFP_NOFS); 1145f39d397SChris Mason if (!em) { 1155f39d397SChris Mason em = ERR_PTR(-ENOMEM); 1165f39d397SChris Mason goto out; 1175f39d397SChris Mason } 1185f39d397SChris Mason em->start = 0; 1190afbaf8cSChris Mason em->len = (u64)-1; 120c8b97818SChris Mason em->block_len = (u64)-1; 1215f39d397SChris Mason em->block_start = 0; 122a061fc8dSChris Mason em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; 123d1310b2eSChris Mason 124d1310b2eSChris Mason spin_lock(&em_tree->lock); 1255f39d397SChris Mason ret = add_extent_mapping(em_tree, em); 1265f39d397SChris Mason if (ret == -EEXIST) { 1270afbaf8cSChris Mason u64 failed_start = em->start; 1280afbaf8cSChris Mason u64 failed_len = em->len; 1290afbaf8cSChris Mason 1300afbaf8cSChris Mason printk("failed to insert %Lu %Lu -> %Lu into tree\n", 1310afbaf8cSChris Mason em->start, em->len, em->block_start); 1325f39d397SChris Mason free_extent_map(em); 1337b13b7b1SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1340afbaf8cSChris Mason if (em) { 1350afbaf8cSChris Mason printk("after failing, found %Lu %Lu %Lu\n", 1360afbaf8cSChris Mason em->start, em->len, em->block_start); 1377b13b7b1SChris Mason ret = 0; 1380afbaf8cSChris Mason } else { 1390afbaf8cSChris Mason em = lookup_extent_mapping(em_tree, failed_start, 1400afbaf8cSChris Mason failed_len); 1410afbaf8cSChris Mason if (em) { 1420afbaf8cSChris Mason printk("double failure lookup gives us " 1430afbaf8cSChris Mason "%Lu %Lu -> %Lu\n", em->start, 1440afbaf8cSChris Mason em->len, em->block_start); 1450afbaf8cSChris Mason free_extent_map(em); 1460afbaf8cSChris Mason } 1477b13b7b1SChris Mason ret = -EIO; 1480afbaf8cSChris Mason } 1495f39d397SChris Mason } else if (ret) { 1507b13b7b1SChris Mason free_extent_map(em); 1517b13b7b1SChris Mason em = NULL; 1525f39d397SChris Mason } 1537b13b7b1SChris Mason spin_unlock(&em_tree->lock); 1547b13b7b1SChris Mason 1557b13b7b1SChris Mason if (ret) 1567b13b7b1SChris Mason em = ERR_PTR(ret); 1575f39d397SChris Mason out: 1585f39d397SChris Mason return em; 1595f39d397SChris Mason } 1605f39d397SChris Mason 16119c00ddcSChris Mason u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) 16219c00ddcSChris Mason { 163a5eb62e3SMiguel return btrfs_crc32c(seed, data, len); 16419c00ddcSChris Mason } 16519c00ddcSChris Mason 16619c00ddcSChris Mason void btrfs_csum_final(u32 crc, char *result) 16719c00ddcSChris Mason { 16819c00ddcSChris Mason *(__le32 *)result = ~cpu_to_le32(crc); 16919c00ddcSChris Mason } 17019c00ddcSChris Mason 171d352ac68SChris Mason /* 172d352ac68SChris Mason * compute the csum for a btree block, and either verify it or write it 173d352ac68SChris Mason * into the csum field of the block. 174d352ac68SChris Mason */ 17519c00ddcSChris Mason static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, 17619c00ddcSChris Mason int verify) 17719c00ddcSChris Mason { 17819c00ddcSChris Mason char result[BTRFS_CRC32_SIZE]; 17919c00ddcSChris Mason unsigned long len; 18019c00ddcSChris Mason unsigned long cur_len; 18119c00ddcSChris Mason unsigned long offset = BTRFS_CSUM_SIZE; 18219c00ddcSChris Mason char *map_token = NULL; 18319c00ddcSChris Mason char *kaddr; 18419c00ddcSChris Mason unsigned long map_start; 18519c00ddcSChris Mason unsigned long map_len; 18619c00ddcSChris Mason int err; 18719c00ddcSChris Mason u32 crc = ~(u32)0; 18819c00ddcSChris Mason 18919c00ddcSChris Mason len = buf->len - offset; 19019c00ddcSChris Mason while(len > 0) { 19119c00ddcSChris Mason err = map_private_extent_buffer(buf, offset, 32, 19219c00ddcSChris Mason &map_token, &kaddr, 19319c00ddcSChris Mason &map_start, &map_len, KM_USER0); 19419c00ddcSChris Mason if (err) { 19519c00ddcSChris Mason printk("failed to map extent buffer! %lu\n", 19619c00ddcSChris Mason offset); 19719c00ddcSChris Mason return 1; 19819c00ddcSChris Mason } 19919c00ddcSChris Mason cur_len = min(len, map_len - (offset - map_start)); 20019c00ddcSChris Mason crc = btrfs_csum_data(root, kaddr + offset - map_start, 20119c00ddcSChris Mason crc, cur_len); 20219c00ddcSChris Mason len -= cur_len; 20319c00ddcSChris Mason offset += cur_len; 20419c00ddcSChris Mason unmap_extent_buffer(buf, map_token, KM_USER0); 20519c00ddcSChris Mason } 20619c00ddcSChris Mason btrfs_csum_final(crc, result); 20719c00ddcSChris Mason 20819c00ddcSChris Mason if (verify) { 209e4204dedSChris Mason /* FIXME, this is not good */ 21063b10fc4SChris Mason if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) { 211e4204dedSChris Mason u32 val; 212e4204dedSChris Mason u32 found = 0; 213e4204dedSChris Mason memcpy(&found, result, BTRFS_CRC32_SIZE); 214e4204dedSChris Mason 215e4204dedSChris Mason read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE); 216e4204dedSChris Mason printk("btrfs: %s checksum verify failed on %llu " 2172dd3e67bSChris Mason "wanted %X found %X level %d\n", 21819c00ddcSChris Mason root->fs_info->sb->s_id, 2192dd3e67bSChris Mason buf->start, val, found, btrfs_header_level(buf)); 22019c00ddcSChris Mason return 1; 22119c00ddcSChris Mason } 22219c00ddcSChris Mason } else { 22319c00ddcSChris Mason write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE); 22419c00ddcSChris Mason } 22519c00ddcSChris Mason return 0; 22619c00ddcSChris Mason } 22719c00ddcSChris Mason 228d352ac68SChris Mason /* 229d352ac68SChris Mason * we can't consider a given block up to date unless the transid of the 230d352ac68SChris Mason * block matches the transid in the parent node's pointer. This is how we 231d352ac68SChris Mason * detect blocks that either didn't get written at all or got written 232d352ac68SChris Mason * in the wrong place. 233d352ac68SChris Mason */ 2341259ab75SChris Mason static int verify_parent_transid(struct extent_io_tree *io_tree, 2351259ab75SChris Mason struct extent_buffer *eb, u64 parent_transid) 2361259ab75SChris Mason { 2371259ab75SChris Mason int ret; 2381259ab75SChris Mason 2391259ab75SChris Mason if (!parent_transid || btrfs_header_generation(eb) == parent_transid) 2401259ab75SChris Mason return 0; 2411259ab75SChris Mason 2421259ab75SChris Mason lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS); 2431259ab75SChris Mason if (extent_buffer_uptodate(io_tree, eb) && 2441259ab75SChris Mason btrfs_header_generation(eb) == parent_transid) { 2451259ab75SChris Mason ret = 0; 2461259ab75SChris Mason goto out; 2471259ab75SChris Mason } 2481259ab75SChris Mason printk("parent transid verify failed on %llu wanted %llu found %llu\n", 2491259ab75SChris Mason (unsigned long long)eb->start, 2501259ab75SChris Mason (unsigned long long)parent_transid, 2511259ab75SChris Mason (unsigned long long)btrfs_header_generation(eb)); 2521259ab75SChris Mason ret = 1; 2531259ab75SChris Mason clear_extent_buffer_uptodate(io_tree, eb); 25433958dc6SChris Mason out: 2551259ab75SChris Mason unlock_extent(io_tree, eb->start, eb->start + eb->len - 1, 2561259ab75SChris Mason GFP_NOFS); 2571259ab75SChris Mason return ret; 2581259ab75SChris Mason } 2591259ab75SChris Mason 260d352ac68SChris Mason /* 261d352ac68SChris Mason * helper to read a given tree block, doing retries as required when 262d352ac68SChris Mason * the checksums don't match and we have alternate mirrors to try. 263d352ac68SChris Mason */ 264f188591eSChris Mason static int btree_read_extent_buffer_pages(struct btrfs_root *root, 265f188591eSChris Mason struct extent_buffer *eb, 266ca7a79adSChris Mason u64 start, u64 parent_transid) 267f188591eSChris Mason { 268f188591eSChris Mason struct extent_io_tree *io_tree; 269f188591eSChris Mason int ret; 270f188591eSChris Mason int num_copies = 0; 271f188591eSChris Mason int mirror_num = 0; 272f188591eSChris Mason 273f188591eSChris Mason io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 274f188591eSChris Mason while (1) { 275f188591eSChris Mason ret = read_extent_buffer_pages(io_tree, eb, start, 1, 276f188591eSChris Mason btree_get_extent, mirror_num); 2771259ab75SChris Mason if (!ret && 2781259ab75SChris Mason !verify_parent_transid(io_tree, eb, parent_transid)) 279f188591eSChris Mason return ret; 280a1b32a59SChris Mason printk("read extent buffer pages failed with ret %d mirror no %d\n", ret, mirror_num); 281f188591eSChris Mason num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, 282f188591eSChris Mason eb->start, eb->len); 2834235298eSChris Mason if (num_copies == 1) 284f188591eSChris Mason return ret; 2854235298eSChris Mason 286f188591eSChris Mason mirror_num++; 2874235298eSChris Mason if (mirror_num > num_copies) 288f188591eSChris Mason return ret; 289f188591eSChris Mason } 290f188591eSChris Mason return -EIO; 291f188591eSChris Mason } 29219c00ddcSChris Mason 293d352ac68SChris Mason /* 294d352ac68SChris Mason * checksum a dirty tree block before IO. This has extra checks to make 295d352ac68SChris Mason * sure we only fill in the checksum field in the first page of a multi-page block 296d352ac68SChris Mason */ 29719c00ddcSChris Mason int csum_dirty_buffer(struct btrfs_root *root, struct page *page) 29819c00ddcSChris Mason { 299d1310b2eSChris Mason struct extent_io_tree *tree; 30035ebb934SChris Mason u64 start = (u64)page->index << PAGE_CACHE_SHIFT; 30119c00ddcSChris Mason u64 found_start; 30219c00ddcSChris Mason int found_level; 30319c00ddcSChris Mason unsigned long len; 30419c00ddcSChris Mason struct extent_buffer *eb; 305f188591eSChris Mason int ret; 306f188591eSChris Mason 307d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 30819c00ddcSChris Mason 30919c00ddcSChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 31019c00ddcSChris Mason goto out; 31119c00ddcSChris Mason if (!page->private) 31219c00ddcSChris Mason goto out; 31319c00ddcSChris Mason len = page->private >> 2; 31419c00ddcSChris Mason if (len == 0) { 31519c00ddcSChris Mason WARN_ON(1); 31619c00ddcSChris Mason } 31719c00ddcSChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 318ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, 319ca7a79adSChris Mason btrfs_header_generation(eb)); 320f188591eSChris Mason BUG_ON(ret); 32119c00ddcSChris Mason found_start = btrfs_header_bytenr(eb); 32219c00ddcSChris Mason if (found_start != start) { 32319c00ddcSChris Mason printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n", 32419c00ddcSChris Mason start, found_start, len); 32555c69072SChris Mason WARN_ON(1); 32655c69072SChris Mason goto err; 32755c69072SChris Mason } 32855c69072SChris Mason if (eb->first_page != page) { 32955c69072SChris Mason printk("bad first page %lu %lu\n", eb->first_page->index, 33055c69072SChris Mason page->index); 33155c69072SChris Mason WARN_ON(1); 33255c69072SChris Mason goto err; 33355c69072SChris Mason } 33455c69072SChris Mason if (!PageUptodate(page)) { 33555c69072SChris Mason printk("csum not up to date page %lu\n", page->index); 33655c69072SChris Mason WARN_ON(1); 33755c69072SChris Mason goto err; 33819c00ddcSChris Mason } 33919c00ddcSChris Mason found_level = btrfs_header_level(eb); 3404bef0848SChris Mason 34119c00ddcSChris Mason csum_tree_block(root, eb, 0); 34255c69072SChris Mason err: 34319c00ddcSChris Mason free_extent_buffer(eb); 34419c00ddcSChris Mason out: 34519c00ddcSChris Mason return 0; 34619c00ddcSChris Mason } 34719c00ddcSChris Mason 3482b82032cSYan Zheng static int check_tree_block_fsid(struct btrfs_root *root, 3492b82032cSYan Zheng struct extent_buffer *eb) 3502b82032cSYan Zheng { 3512b82032cSYan Zheng struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; 3522b82032cSYan Zheng u8 fsid[BTRFS_UUID_SIZE]; 3532b82032cSYan Zheng int ret = 1; 3542b82032cSYan Zheng 3552b82032cSYan Zheng read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), 3562b82032cSYan Zheng BTRFS_FSID_SIZE); 3572b82032cSYan Zheng while (fs_devices) { 3582b82032cSYan Zheng if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { 3592b82032cSYan Zheng ret = 0; 3602b82032cSYan Zheng break; 3612b82032cSYan Zheng } 3622b82032cSYan Zheng fs_devices = fs_devices->seed; 3632b82032cSYan Zheng } 3642b82032cSYan Zheng return ret; 3652b82032cSYan Zheng } 3662b82032cSYan Zheng 367ce9adaa5SChris Mason int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, 368ce9adaa5SChris Mason struct extent_state *state) 369ce9adaa5SChris Mason { 370ce9adaa5SChris Mason struct extent_io_tree *tree; 371ce9adaa5SChris Mason u64 found_start; 372ce9adaa5SChris Mason int found_level; 373ce9adaa5SChris Mason unsigned long len; 374ce9adaa5SChris Mason struct extent_buffer *eb; 375ce9adaa5SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 376f188591eSChris Mason int ret = 0; 377ce9adaa5SChris Mason 378ce9adaa5SChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 379ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 380ce9adaa5SChris Mason goto out; 381ce9adaa5SChris Mason if (!page->private) 382ce9adaa5SChris Mason goto out; 383ce9adaa5SChris Mason len = page->private >> 2; 384ce9adaa5SChris Mason if (len == 0) { 385ce9adaa5SChris Mason WARN_ON(1); 386ce9adaa5SChris Mason } 387ce9adaa5SChris Mason eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); 388f188591eSChris Mason 389ce9adaa5SChris Mason found_start = btrfs_header_bytenr(eb); 39023a07867SChris Mason if (found_start != start) { 391a1b32a59SChris Mason printk("bad tree block start %llu %llu\n", 392a1b32a59SChris Mason (unsigned long long)found_start, 393a1b32a59SChris Mason (unsigned long long)eb->start); 394f188591eSChris Mason ret = -EIO; 395ce9adaa5SChris Mason goto err; 396ce9adaa5SChris Mason } 397ce9adaa5SChris Mason if (eb->first_page != page) { 398ce9adaa5SChris Mason printk("bad first page %lu %lu\n", eb->first_page->index, 399ce9adaa5SChris Mason page->index); 400ce9adaa5SChris Mason WARN_ON(1); 401f188591eSChris Mason ret = -EIO; 402ce9adaa5SChris Mason goto err; 403ce9adaa5SChris Mason } 4042b82032cSYan Zheng if (check_tree_block_fsid(root, eb)) { 4051259ab75SChris Mason printk("bad fsid on block %Lu\n", eb->start); 4061259ab75SChris Mason ret = -EIO; 4071259ab75SChris Mason goto err; 4081259ab75SChris Mason } 409ce9adaa5SChris Mason found_level = btrfs_header_level(eb); 410ce9adaa5SChris Mason 411ce9adaa5SChris Mason ret = csum_tree_block(root, eb, 1); 412f188591eSChris Mason if (ret) 413f188591eSChris Mason ret = -EIO; 414ce9adaa5SChris Mason 415ce9adaa5SChris Mason end = min_t(u64, eb->len, PAGE_CACHE_SIZE); 416ce9adaa5SChris Mason end = eb->start + end - 1; 417ce9adaa5SChris Mason err: 418ce9adaa5SChris Mason free_extent_buffer(eb); 419ce9adaa5SChris Mason out: 420f188591eSChris Mason return ret; 421ce9adaa5SChris Mason } 422ce9adaa5SChris Mason 423ce9adaa5SChris Mason static void end_workqueue_bio(struct bio *bio, int err) 424ce9adaa5SChris Mason { 425ce9adaa5SChris Mason struct end_io_wq *end_io_wq = bio->bi_private; 426ce9adaa5SChris Mason struct btrfs_fs_info *fs_info; 427ce9adaa5SChris Mason 428ce9adaa5SChris Mason fs_info = end_io_wq->info; 429ce9adaa5SChris Mason end_io_wq->error = err; 4308b712842SChris Mason end_io_wq->work.func = end_workqueue_fn; 4318b712842SChris Mason end_io_wq->work.flags = 0; 432e6dcd2dcSChris Mason if (bio->bi_rw & (1 << BIO_RW)) 433e6dcd2dcSChris Mason btrfs_queue_worker(&fs_info->endio_write_workers, 434e6dcd2dcSChris Mason &end_io_wq->work); 435e6dcd2dcSChris Mason else 4368b712842SChris Mason btrfs_queue_worker(&fs_info->endio_workers, &end_io_wq->work); 437ce9adaa5SChris Mason } 438ce9adaa5SChris Mason 43922c59948SChris Mason int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, 44022c59948SChris Mason int metadata) 4410b86a832SChris Mason { 442ce9adaa5SChris Mason struct end_io_wq *end_io_wq; 443ce9adaa5SChris Mason end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); 444ce9adaa5SChris Mason if (!end_io_wq) 445ce9adaa5SChris Mason return -ENOMEM; 446ce9adaa5SChris Mason 447ce9adaa5SChris Mason end_io_wq->private = bio->bi_private; 448ce9adaa5SChris Mason end_io_wq->end_io = bio->bi_end_io; 44922c59948SChris Mason end_io_wq->info = info; 450ce9adaa5SChris Mason end_io_wq->error = 0; 451ce9adaa5SChris Mason end_io_wq->bio = bio; 45222c59948SChris Mason end_io_wq->metadata = metadata; 453ce9adaa5SChris Mason 454ce9adaa5SChris Mason bio->bi_private = end_io_wq; 455ce9adaa5SChris Mason bio->bi_end_io = end_workqueue_bio; 45622c59948SChris Mason return 0; 45722c59948SChris Mason } 45822c59948SChris Mason 459b64a2851SChris Mason unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) 4604854ddd0SChris Mason { 4614854ddd0SChris Mason unsigned long limit = min_t(unsigned long, 4624854ddd0SChris Mason info->workers.max_workers, 4634854ddd0SChris Mason info->fs_devices->open_devices); 4644854ddd0SChris Mason return 256 * limit; 4654854ddd0SChris Mason } 4664854ddd0SChris Mason 467777e6bd7SChris Mason int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) 4680986fe9eSChris Mason { 469b64a2851SChris Mason return atomic_read(&info->nr_async_bios) > 470b64a2851SChris Mason btrfs_async_submit_limit(info); 4710986fe9eSChris Mason } 4720986fe9eSChris Mason 4734a69a410SChris Mason static void run_one_async_start(struct btrfs_work *work) 4744a69a410SChris Mason { 4754a69a410SChris Mason struct btrfs_fs_info *fs_info; 4764a69a410SChris Mason struct async_submit_bio *async; 4774a69a410SChris Mason 4784a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 4794a69a410SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 4804a69a410SChris Mason async->submit_bio_start(async->inode, async->rw, async->bio, 4814a69a410SChris Mason async->mirror_num, async->bio_flags); 4824a69a410SChris Mason } 4834a69a410SChris Mason 4844a69a410SChris Mason static void run_one_async_done(struct btrfs_work *work) 4858b712842SChris Mason { 4868b712842SChris Mason struct btrfs_fs_info *fs_info; 4878b712842SChris Mason struct async_submit_bio *async; 4884854ddd0SChris Mason int limit; 4898b712842SChris Mason 4908b712842SChris Mason async = container_of(work, struct async_submit_bio, work); 4918b712842SChris Mason fs_info = BTRFS_I(async->inode)->root->fs_info; 4924854ddd0SChris Mason 493b64a2851SChris Mason limit = btrfs_async_submit_limit(fs_info); 4944854ddd0SChris Mason limit = limit * 2 / 3; 4954854ddd0SChris Mason 4968b712842SChris Mason atomic_dec(&fs_info->nr_async_submits); 4970986fe9eSChris Mason 498b64a2851SChris Mason if (atomic_read(&fs_info->nr_async_submits) < limit && 499b64a2851SChris Mason waitqueue_active(&fs_info->async_submit_wait)) 5004854ddd0SChris Mason wake_up(&fs_info->async_submit_wait); 5014854ddd0SChris Mason 5024a69a410SChris Mason async->submit_bio_done(async->inode, async->rw, async->bio, 503c8b97818SChris Mason async->mirror_num, async->bio_flags); 5044a69a410SChris Mason } 5054a69a410SChris Mason 5064a69a410SChris Mason static void run_one_async_free(struct btrfs_work *work) 5074a69a410SChris Mason { 5084a69a410SChris Mason struct async_submit_bio *async; 5094a69a410SChris Mason 5104a69a410SChris Mason async = container_of(work, struct async_submit_bio, work); 5118b712842SChris Mason kfree(async); 5128b712842SChris Mason } 5138b712842SChris Mason 51444b8bd7eSChris Mason int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, 51544b8bd7eSChris Mason int rw, struct bio *bio, int mirror_num, 516c8b97818SChris Mason unsigned long bio_flags, 5174a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_start, 5184a69a410SChris Mason extent_submit_bio_hook_t *submit_bio_done) 51944b8bd7eSChris Mason { 52044b8bd7eSChris Mason struct async_submit_bio *async; 521b64a2851SChris Mason int limit = btrfs_async_submit_limit(fs_info); 52244b8bd7eSChris Mason 52344b8bd7eSChris Mason async = kmalloc(sizeof(*async), GFP_NOFS); 52444b8bd7eSChris Mason if (!async) 52544b8bd7eSChris Mason return -ENOMEM; 52644b8bd7eSChris Mason 52744b8bd7eSChris Mason async->inode = inode; 52844b8bd7eSChris Mason async->rw = rw; 52944b8bd7eSChris Mason async->bio = bio; 53044b8bd7eSChris Mason async->mirror_num = mirror_num; 5314a69a410SChris Mason async->submit_bio_start = submit_bio_start; 5324a69a410SChris Mason async->submit_bio_done = submit_bio_done; 5334a69a410SChris Mason 5344a69a410SChris Mason async->work.func = run_one_async_start; 5354a69a410SChris Mason async->work.ordered_func = run_one_async_done; 5364a69a410SChris Mason async->work.ordered_free = run_one_async_free; 5374a69a410SChris Mason 5388b712842SChris Mason async->work.flags = 0; 539c8b97818SChris Mason async->bio_flags = bio_flags; 5408c8bee1dSChris Mason 5418c8bee1dSChris Mason while(atomic_read(&fs_info->async_submit_draining) && 5428c8bee1dSChris Mason atomic_read(&fs_info->nr_async_submits)) { 5438c8bee1dSChris Mason wait_event(fs_info->async_submit_wait, 5448c8bee1dSChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 5458c8bee1dSChris Mason } 5468c8bee1dSChris Mason 547cb03c743SChris Mason atomic_inc(&fs_info->nr_async_submits); 5488b712842SChris Mason btrfs_queue_worker(&fs_info->workers, &async->work); 5494854ddd0SChris Mason 5509473f16cSChris Mason if (atomic_read(&fs_info->nr_async_submits) > limit) { 5514854ddd0SChris Mason wait_event_timeout(fs_info->async_submit_wait, 5524854ddd0SChris Mason (atomic_read(&fs_info->nr_async_submits) < limit), 5534854ddd0SChris Mason HZ/10); 5549473f16cSChris Mason 5559473f16cSChris Mason wait_event_timeout(fs_info->async_submit_wait, 5569473f16cSChris Mason (atomic_read(&fs_info->nr_async_bios) < limit), 5579473f16cSChris Mason HZ/10); 5589473f16cSChris Mason } 559771ed689SChris Mason 560771ed689SChris Mason while(atomic_read(&fs_info->async_submit_draining) && 561771ed689SChris Mason atomic_read(&fs_info->nr_async_submits)) { 562771ed689SChris Mason wait_event(fs_info->async_submit_wait, 563771ed689SChris Mason (atomic_read(&fs_info->nr_async_submits) == 0)); 564771ed689SChris Mason } 565771ed689SChris Mason 56644b8bd7eSChris Mason return 0; 56744b8bd7eSChris Mason } 56844b8bd7eSChris Mason 569ce3ed71aSChris Mason static int btree_csum_one_bio(struct bio *bio) 570ce3ed71aSChris Mason { 571ce3ed71aSChris Mason struct bio_vec *bvec = bio->bi_io_vec; 572ce3ed71aSChris Mason int bio_index = 0; 573ce3ed71aSChris Mason struct btrfs_root *root; 574ce3ed71aSChris Mason 575ce3ed71aSChris Mason WARN_ON(bio->bi_vcnt <= 0); 576ce3ed71aSChris Mason while(bio_index < bio->bi_vcnt) { 577ce3ed71aSChris Mason root = BTRFS_I(bvec->bv_page->mapping->host)->root; 578ce3ed71aSChris Mason csum_dirty_buffer(root, bvec->bv_page); 579ce3ed71aSChris Mason bio_index++; 580ce3ed71aSChris Mason bvec++; 581ce3ed71aSChris Mason } 582ce3ed71aSChris Mason return 0; 583ce3ed71aSChris Mason } 584ce3ed71aSChris Mason 5854a69a410SChris Mason static int __btree_submit_bio_start(struct inode *inode, int rw, 5864a69a410SChris Mason struct bio *bio, int mirror_num, 5874a69a410SChris Mason unsigned long bio_flags) 58822c59948SChris Mason { 5898b712842SChris Mason /* 5908b712842SChris Mason * when we're called for a write, we're already in the async 5915443be45SChris Mason * submission context. Just jump into btrfs_map_bio 5928b712842SChris Mason */ 593ce3ed71aSChris Mason btree_csum_one_bio(bio); 5944a69a410SChris Mason return 0; 59522c59948SChris Mason } 59622c59948SChris Mason 5974a69a410SChris Mason static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, 5984a69a410SChris Mason int mirror_num, unsigned long bio_flags) 5994a69a410SChris Mason { 6008b712842SChris Mason /* 6014a69a410SChris Mason * when we're called for a write, we're already in the async 6024a69a410SChris Mason * submission context. Just jump into btrfs_map_bio 6038b712842SChris Mason */ 6048b712842SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); 6050b86a832SChris Mason } 6060b86a832SChris Mason 60744b8bd7eSChris Mason static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, 608c8b97818SChris Mason int mirror_num, unsigned long bio_flags) 60944b8bd7eSChris Mason { 6108b712842SChris Mason /* 6118b712842SChris Mason * kthread helpers are used to submit writes so that checksumming 6128b712842SChris Mason * can happen in parallel across all CPUs 6138b712842SChris Mason */ 61444b8bd7eSChris Mason if (!(rw & (1 << BIO_RW))) { 6154a69a410SChris Mason int ret; 6164a69a410SChris Mason /* 6174a69a410SChris Mason * called for a read, do the setup so that checksum validation 6184a69a410SChris Mason * can happen in the async kernel threads 6194a69a410SChris Mason */ 6204a69a410SChris Mason ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, 6214a69a410SChris Mason bio, 1); 6224a69a410SChris Mason BUG_ON(ret); 6234a69a410SChris Mason 6244a69a410SChris Mason return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, 6256f3577bdSChris Mason mirror_num, 0); 62644b8bd7eSChris Mason } 62744b8bd7eSChris Mason return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, 628c8b97818SChris Mason inode, rw, bio, mirror_num, 0, 6294a69a410SChris Mason __btree_submit_bio_start, 6304a69a410SChris Mason __btree_submit_bio_done); 63144b8bd7eSChris Mason } 63244b8bd7eSChris Mason 6335f39d397SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 6345f39d397SChris Mason { 635d1310b2eSChris Mason struct extent_io_tree *tree; 636d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 6375443be45SChris Mason 6385443be45SChris Mason if (current->flags & PF_MEMALLOC) { 6395443be45SChris Mason redirty_page_for_writepage(wbc, page); 6405443be45SChris Mason unlock_page(page); 6415443be45SChris Mason return 0; 6425443be45SChris Mason } 6435f39d397SChris Mason return extent_write_full_page(tree, page, btree_get_extent, wbc); 6445f39d397SChris Mason } 6450da5468fSChris Mason 6460da5468fSChris Mason static int btree_writepages(struct address_space *mapping, 6470da5468fSChris Mason struct writeback_control *wbc) 6480da5468fSChris Mason { 649d1310b2eSChris Mason struct extent_io_tree *tree; 650d1310b2eSChris Mason tree = &BTRFS_I(mapping->host)->io_tree; 651d8d5f3e1SChris Mason if (wbc->sync_mode == WB_SYNC_NONE) { 652793955bcSChris Mason u64 num_dirty; 653793955bcSChris Mason u64 start = 0; 65424ab9cd8SChris Mason unsigned long thresh = 32 * 1024 * 1024; 655448d640bSChris Mason 656448d640bSChris Mason if (wbc->for_kupdate) 657448d640bSChris Mason return 0; 658448d640bSChris Mason 6591832a6d5SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 6601832a6d5SChris Mason thresh, EXTENT_DIRTY); 661793955bcSChris Mason if (num_dirty < thresh) { 662793955bcSChris Mason return 0; 663793955bcSChris Mason } 664793955bcSChris Mason } 6650da5468fSChris Mason return extent_writepages(tree, mapping, btree_get_extent, wbc); 6660da5468fSChris Mason } 6670da5468fSChris Mason 6685f39d397SChris Mason int btree_readpage(struct file *file, struct page *page) 6695f39d397SChris Mason { 670d1310b2eSChris Mason struct extent_io_tree *tree; 671d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 6725f39d397SChris Mason return extent_read_full_page(tree, page, btree_get_extent); 6735f39d397SChris Mason } 6745f39d397SChris Mason 67570dec807SChris Mason static int btree_releasepage(struct page *page, gfp_t gfp_flags) 6765f39d397SChris Mason { 677d1310b2eSChris Mason struct extent_io_tree *tree; 678d1310b2eSChris Mason struct extent_map_tree *map; 6795f39d397SChris Mason int ret; 6805f39d397SChris Mason 68198509cfcSChris Mason if (PageWriteback(page) || PageDirty(page)) 68298509cfcSChris Mason return 0; 68398509cfcSChris Mason 684d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 685d1310b2eSChris Mason map = &BTRFS_I(page->mapping->host)->extent_tree; 6866af118ceSChris Mason 6877b13b7b1SChris Mason ret = try_release_extent_state(map, tree, page, gfp_flags); 6886af118ceSChris Mason if (!ret) { 6896af118ceSChris Mason return 0; 6906af118ceSChris Mason } 6916af118ceSChris Mason 6926af118ceSChris Mason ret = try_release_extent_buffer(tree, page); 6935f39d397SChris Mason if (ret == 1) { 6945f39d397SChris Mason ClearPagePrivate(page); 6955f39d397SChris Mason set_page_private(page, 0); 696d98237b3SChris Mason page_cache_release(page); 6975f39d397SChris Mason } 6986af118ceSChris Mason 699d98237b3SChris Mason return ret; 700d98237b3SChris Mason } 701d98237b3SChris Mason 7025f39d397SChris Mason static void btree_invalidatepage(struct page *page, unsigned long offset) 703d98237b3SChris Mason { 704d1310b2eSChris Mason struct extent_io_tree *tree; 705d1310b2eSChris Mason tree = &BTRFS_I(page->mapping->host)->io_tree; 7065f39d397SChris Mason extent_invalidatepage(tree, page, offset); 7075f39d397SChris Mason btree_releasepage(page, GFP_NOFS); 7089ad6b7bcSChris Mason if (PagePrivate(page)) { 7096af118ceSChris Mason printk("warning page private not zero on page %Lu\n", 7106af118ceSChris Mason page_offset(page)); 7119ad6b7bcSChris Mason ClearPagePrivate(page); 7129ad6b7bcSChris Mason set_page_private(page, 0); 7139ad6b7bcSChris Mason page_cache_release(page); 7149ad6b7bcSChris Mason } 715d98237b3SChris Mason } 716d98237b3SChris Mason 7175f39d397SChris Mason #if 0 718d98237b3SChris Mason static int btree_writepage(struct page *page, struct writeback_control *wbc) 719d98237b3SChris Mason { 72087cbda5cSChris Mason struct buffer_head *bh; 7210f7d52f4SChris Mason struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; 72287cbda5cSChris Mason struct buffer_head *head; 72387cbda5cSChris Mason if (!page_has_buffers(page)) { 72487cbda5cSChris Mason create_empty_buffers(page, root->fs_info->sb->s_blocksize, 72587cbda5cSChris Mason (1 << BH_Dirty)|(1 << BH_Uptodate)); 72687cbda5cSChris Mason } 72787cbda5cSChris Mason head = page_buffers(page); 72887cbda5cSChris Mason bh = head; 72987cbda5cSChris Mason do { 73087cbda5cSChris Mason if (buffer_dirty(bh)) 73187cbda5cSChris Mason csum_tree_block(root, bh, 0); 73287cbda5cSChris Mason bh = bh->b_this_page; 73387cbda5cSChris Mason } while (bh != head); 734d98237b3SChris Mason return block_write_full_page(page, btree_get_block, wbc); 735d98237b3SChris Mason } 7365f39d397SChris Mason #endif 737d98237b3SChris Mason 738d98237b3SChris Mason static struct address_space_operations btree_aops = { 739d98237b3SChris Mason .readpage = btree_readpage, 740d98237b3SChris Mason .writepage = btree_writepage, 7410da5468fSChris Mason .writepages = btree_writepages, 7425f39d397SChris Mason .releasepage = btree_releasepage, 7435f39d397SChris Mason .invalidatepage = btree_invalidatepage, 744d98237b3SChris Mason .sync_page = block_sync_page, 745d98237b3SChris Mason }; 746123abc88SChris Mason 747ca7a79adSChris Mason int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, 748ca7a79adSChris Mason u64 parent_transid) 749090d1875SChris Mason { 7505f39d397SChris Mason struct extent_buffer *buf = NULL; 7515f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 752de428b63SChris Mason int ret = 0; 753090d1875SChris Mason 754db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 7555f39d397SChris Mason if (!buf) 756090d1875SChris Mason return 0; 757d1310b2eSChris Mason read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, 758f188591eSChris Mason buf, 0, 0, btree_get_extent, 0); 7595f39d397SChris Mason free_extent_buffer(buf); 760de428b63SChris Mason return ret; 761090d1875SChris Mason } 762090d1875SChris Mason 7630999df54SChris Mason struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, 7640999df54SChris Mason u64 bytenr, u32 blocksize) 7650999df54SChris Mason { 7660999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 7670999df54SChris Mason struct extent_buffer *eb; 7680999df54SChris Mason eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 7690999df54SChris Mason bytenr, blocksize, GFP_NOFS); 7700999df54SChris Mason return eb; 7710999df54SChris Mason } 7720999df54SChris Mason 7730999df54SChris Mason struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, 7740999df54SChris Mason u64 bytenr, u32 blocksize) 7750999df54SChris Mason { 7760999df54SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 7770999df54SChris Mason struct extent_buffer *eb; 7780999df54SChris Mason 7790999df54SChris Mason eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, 7800999df54SChris Mason bytenr, blocksize, NULL, GFP_NOFS); 7810999df54SChris Mason return eb; 7820999df54SChris Mason } 7830999df54SChris Mason 7840999df54SChris Mason 785e02119d5SChris Mason int btrfs_write_tree_block(struct extent_buffer *buf) 786e02119d5SChris Mason { 787e02119d5SChris Mason return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start, 78824ab9cd8SChris Mason buf->start + buf->len - 1, WB_SYNC_ALL); 789e02119d5SChris Mason } 790e02119d5SChris Mason 791e02119d5SChris Mason int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) 792e02119d5SChris Mason { 793e02119d5SChris Mason return btrfs_wait_on_page_writeback_range(buf->first_page->mapping, 794e02119d5SChris Mason buf->start, buf->start + buf->len -1); 795e02119d5SChris Mason } 796e02119d5SChris Mason 797db94535dSChris Mason struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, 798ca7a79adSChris Mason u32 blocksize, u64 parent_transid) 799e20d96d6SChris Mason { 8005f39d397SChris Mason struct extent_buffer *buf = NULL; 8015f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 802d1310b2eSChris Mason struct extent_io_tree *io_tree; 80319c00ddcSChris Mason int ret; 80419c00ddcSChris Mason 805d1310b2eSChris Mason io_tree = &BTRFS_I(btree_inode)->io_tree; 806e20d96d6SChris Mason 807db94535dSChris Mason buf = btrfs_find_create_tree_block(root, bytenr, blocksize); 8085f39d397SChris Mason if (!buf) 809d98237b3SChris Mason return NULL; 810e4204dedSChris Mason 811ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 812ce9adaa5SChris Mason 813ce9adaa5SChris Mason if (ret == 0) { 814ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 815a1b32a59SChris Mason } else { 816a1b32a59SChris Mason WARN_ON(1); 817ce9adaa5SChris Mason } 8185f39d397SChris Mason return buf; 819ce9adaa5SChris Mason 820eb60ceacSChris Mason } 821eb60ceacSChris Mason 822e089f05cSChris Mason int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, 8235f39d397SChris Mason struct extent_buffer *buf) 824ed2ff2cbSChris Mason { 8255f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 82655c69072SChris Mason if (btrfs_header_generation(buf) == 827925baeddSChris Mason root->fs_info->running_transaction->transid) { 828925baeddSChris Mason WARN_ON(!btrfs_tree_locked(buf)); 829d1310b2eSChris Mason clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, 83055c69072SChris Mason buf); 831925baeddSChris Mason } 8325f39d397SChris Mason return 0; 8335f39d397SChris Mason } 8345f39d397SChris Mason 835db94535dSChris Mason static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 83687ee04ebSChris Mason u32 stripesize, struct btrfs_root *root, 8379f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 838e20d96d6SChris Mason u64 objectid) 839d97e63b6SChris Mason { 840cfaa7295SChris Mason root->node = NULL; 841a28ec197SChris Mason root->commit_root = NULL; 84231153d81SYan Zheng root->ref_tree = NULL; 843db94535dSChris Mason root->sectorsize = sectorsize; 844db94535dSChris Mason root->nodesize = nodesize; 845db94535dSChris Mason root->leafsize = leafsize; 84687ee04ebSChris Mason root->stripesize = stripesize; 847123abc88SChris Mason root->ref_cows = 0; 8480b86a832SChris Mason root->track_dirty = 0; 8490b86a832SChris Mason 8509f5fae2fSChris Mason root->fs_info = fs_info; 8510f7d52f4SChris Mason root->objectid = objectid; 8520f7d52f4SChris Mason root->last_trans = 0; 8531b05da2eSChris Mason root->highest_inode = 0; 8541b05da2eSChris Mason root->last_inode_alloc = 0; 85558176a96SJosef Bacik root->name = NULL; 8564313b399SChris Mason root->in_sysfs = 0; 8570b86a832SChris Mason 8580b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 8597b128766SJosef Bacik INIT_LIST_HEAD(&root->orphan_list); 860bcc63abbSYan INIT_LIST_HEAD(&root->dead_list); 861925baeddSChris Mason spin_lock_init(&root->node_lock); 862bcc63abbSYan spin_lock_init(&root->list_lock); 863a2135011SChris Mason mutex_init(&root->objectid_mutex); 864e02119d5SChris Mason mutex_init(&root->log_mutex); 865d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 866d0c803c4SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 867017e5369SChris Mason 868017e5369SChris Mason btrfs_leaf_ref_tree_init(&root->ref_tree_struct); 869017e5369SChris Mason root->ref_tree = &root->ref_tree_struct; 870017e5369SChris Mason 8713768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 8723768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 8736702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 87458176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 8753f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 87658176a96SJosef Bacik init_completion(&root->kobj_unregister); 8776702ed49SChris Mason root->defrag_running = 0; 8786702ed49SChris Mason root->defrag_level = 0; 8794d775673SChris Mason root->root_key.objectid = objectid; 880*3394e160SChris Mason root->anon_super.s_root = NULL; 881*3394e160SChris Mason root->anon_super.s_dev = 0; 882*3394e160SChris Mason INIT_LIST_HEAD(&root->anon_super.s_list); 883*3394e160SChris Mason INIT_LIST_HEAD(&root->anon_super.s_instances); 884*3394e160SChris Mason init_rwsem(&root->anon_super.s_umount); 885*3394e160SChris Mason 8863768f368SChris Mason return 0; 8873768f368SChris Mason } 8883768f368SChris Mason 889db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 8909f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 8919f5fae2fSChris Mason u64 objectid, 892e20d96d6SChris Mason struct btrfs_root *root) 8933768f368SChris Mason { 8943768f368SChris Mason int ret; 895db94535dSChris Mason u32 blocksize; 89684234f3aSYan Zheng u64 generation; 8973768f368SChris Mason 898db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 89987ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 90087ee04ebSChris Mason root, fs_info, objectid); 9013768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 9023768f368SChris Mason &root->root_item, &root->root_key); 9033768f368SChris Mason BUG_ON(ret); 9043768f368SChris Mason 90584234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 906db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 907db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 90884234f3aSYan Zheng blocksize, generation); 9093768f368SChris Mason BUG_ON(!root->node); 910d97e63b6SChris Mason return 0; 911d97e63b6SChris Mason } 912d97e63b6SChris Mason 913e02119d5SChris Mason int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, 914e02119d5SChris Mason struct btrfs_fs_info *fs_info) 915e02119d5SChris Mason { 916e02119d5SChris Mason struct extent_buffer *eb; 917d0c803c4SChris Mason struct btrfs_root *log_root_tree = fs_info->log_root_tree; 918d0c803c4SChris Mason u64 start = 0; 919d0c803c4SChris Mason u64 end = 0; 920e02119d5SChris Mason int ret; 921e02119d5SChris Mason 922d0c803c4SChris Mason if (!log_root_tree) 923e02119d5SChris Mason return 0; 924e02119d5SChris Mason 925d0c803c4SChris Mason while(1) { 926d0c803c4SChris Mason ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, 927d0c803c4SChris Mason 0, &start, &end, EXTENT_DIRTY); 928d0c803c4SChris Mason if (ret) 929d0c803c4SChris Mason break; 930d0c803c4SChris Mason 931d0c803c4SChris Mason clear_extent_dirty(&log_root_tree->dirty_log_pages, 932d0c803c4SChris Mason start, end, GFP_NOFS); 933d0c803c4SChris Mason } 934e02119d5SChris Mason eb = fs_info->log_root_tree->node; 935e02119d5SChris Mason 936e02119d5SChris Mason WARN_ON(btrfs_header_level(eb) != 0); 937e02119d5SChris Mason WARN_ON(btrfs_header_nritems(eb) != 0); 938e02119d5SChris Mason 939d00aff00SChris Mason ret = btrfs_free_reserved_extent(fs_info->tree_root, 940d00aff00SChris Mason eb->start, eb->len); 941e02119d5SChris Mason BUG_ON(ret); 942e02119d5SChris Mason 943e02119d5SChris Mason free_extent_buffer(eb); 944e02119d5SChris Mason kfree(fs_info->log_root_tree); 945e02119d5SChris Mason fs_info->log_root_tree = NULL; 946e02119d5SChris Mason return 0; 947e02119d5SChris Mason } 948e02119d5SChris Mason 949e02119d5SChris Mason int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 950e02119d5SChris Mason struct btrfs_fs_info *fs_info) 9510f7d52f4SChris Mason { 9520f7d52f4SChris Mason struct btrfs_root *root; 9530f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 954e02119d5SChris Mason 955e02119d5SChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 956e02119d5SChris Mason if (!root) 957e02119d5SChris Mason return -ENOMEM; 958e02119d5SChris Mason 959e02119d5SChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 960e02119d5SChris Mason tree_root->sectorsize, tree_root->stripesize, 961e02119d5SChris Mason root, fs_info, BTRFS_TREE_LOG_OBJECTID); 962e02119d5SChris Mason 963e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 964e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 965e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 966e02119d5SChris Mason root->ref_cows = 0; 967e02119d5SChris Mason 968e02119d5SChris Mason root->node = btrfs_alloc_free_block(trans, root, root->leafsize, 96931840ae1SZheng Yan 0, BTRFS_TREE_LOG_OBJECTID, 97031840ae1SZheng Yan trans->transid, 0, 0, 0); 971e02119d5SChris Mason 972e02119d5SChris Mason btrfs_set_header_nritems(root->node, 0); 973e02119d5SChris Mason btrfs_set_header_level(root->node, 0); 974e02119d5SChris Mason btrfs_set_header_bytenr(root->node, root->node->start); 975e02119d5SChris Mason btrfs_set_header_generation(root->node, trans->transid); 976e02119d5SChris Mason btrfs_set_header_owner(root->node, BTRFS_TREE_LOG_OBJECTID); 977e02119d5SChris Mason 978e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 979e02119d5SChris Mason (unsigned long)btrfs_header_fsid(root->node), 980e02119d5SChris Mason BTRFS_FSID_SIZE); 981e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 982e02119d5SChris Mason btrfs_tree_unlock(root->node); 983e02119d5SChris Mason fs_info->log_root_tree = root; 984e02119d5SChris Mason return 0; 985e02119d5SChris Mason } 986e02119d5SChris Mason 987e02119d5SChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 988e02119d5SChris Mason struct btrfs_key *location) 989e02119d5SChris Mason { 990e02119d5SChris Mason struct btrfs_root *root; 991e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 9920f7d52f4SChris Mason struct btrfs_path *path; 9935f39d397SChris Mason struct extent_buffer *l; 9941b05da2eSChris Mason u64 highest_inode; 99584234f3aSYan Zheng u64 generation; 996db94535dSChris Mason u32 blocksize; 9970f7d52f4SChris Mason int ret = 0; 9980f7d52f4SChris Mason 9995eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 10000cf6c620SChris Mason if (!root) 10010f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 10020f7d52f4SChris Mason if (location->offset == (u64)-1) { 1003db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 10040f7d52f4SChris Mason location->objectid, root); 10050f7d52f4SChris Mason if (ret) { 10060f7d52f4SChris Mason kfree(root); 10070f7d52f4SChris Mason return ERR_PTR(ret); 10080f7d52f4SChris Mason } 10090f7d52f4SChris Mason goto insert; 10100f7d52f4SChris Mason } 10110f7d52f4SChris Mason 1012db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 101387ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 101487ee04ebSChris Mason root, fs_info, location->objectid); 10150f7d52f4SChris Mason 10160f7d52f4SChris Mason path = btrfs_alloc_path(); 10170f7d52f4SChris Mason BUG_ON(!path); 10180f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 10190f7d52f4SChris Mason if (ret != 0) { 10200f7d52f4SChris Mason if (ret > 0) 10210f7d52f4SChris Mason ret = -ENOENT; 10220f7d52f4SChris Mason goto out; 10230f7d52f4SChris Mason } 10245f39d397SChris Mason l = path->nodes[0]; 10255f39d397SChris Mason read_extent_buffer(l, &root->root_item, 10265f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 10270f7d52f4SChris Mason sizeof(root->root_item)); 102844b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 10290f7d52f4SChris Mason ret = 0; 10300f7d52f4SChris Mason out: 10310f7d52f4SChris Mason btrfs_release_path(root, path); 10320f7d52f4SChris Mason btrfs_free_path(path); 10330f7d52f4SChris Mason if (ret) { 10340f7d52f4SChris Mason kfree(root); 10350f7d52f4SChris Mason return ERR_PTR(ret); 10360f7d52f4SChris Mason } 103784234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1038db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1039db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 104084234f3aSYan Zheng blocksize, generation); 10410f7d52f4SChris Mason BUG_ON(!root->node); 10420f7d52f4SChris Mason insert: 1043e02119d5SChris Mason if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { 10440f7d52f4SChris Mason root->ref_cows = 1; 10455eda7b5eSChris Mason ret = btrfs_find_highest_inode(root, &highest_inode); 10465eda7b5eSChris Mason if (ret == 0) { 10475eda7b5eSChris Mason root->highest_inode = highest_inode; 10485eda7b5eSChris Mason root->last_inode_alloc = highest_inode; 10495eda7b5eSChris Mason } 1050e02119d5SChris Mason } 10515eda7b5eSChris Mason return root; 10525eda7b5eSChris Mason } 10535eda7b5eSChris Mason 1054dc17ff8fSChris Mason struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 1055dc17ff8fSChris Mason u64 root_objectid) 1056dc17ff8fSChris Mason { 1057dc17ff8fSChris Mason struct btrfs_root *root; 1058dc17ff8fSChris Mason 1059dc17ff8fSChris Mason if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) 1060dc17ff8fSChris Mason return fs_info->tree_root; 1061dc17ff8fSChris Mason if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) 1062dc17ff8fSChris Mason return fs_info->extent_root; 1063dc17ff8fSChris Mason 1064dc17ff8fSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 1065dc17ff8fSChris Mason (unsigned long)root_objectid); 1066dc17ff8fSChris Mason return root; 1067dc17ff8fSChris Mason } 1068dc17ff8fSChris Mason 1069edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 1070edbd8d4eSChris Mason struct btrfs_key *location) 10715eda7b5eSChris Mason { 10725eda7b5eSChris Mason struct btrfs_root *root; 10735eda7b5eSChris Mason int ret; 10745eda7b5eSChris Mason 1075edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1076edbd8d4eSChris Mason return fs_info->tree_root; 1077edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1078edbd8d4eSChris Mason return fs_info->extent_root; 10798f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 10808f18cf13SChris Mason return fs_info->chunk_root; 10818f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 10828f18cf13SChris Mason return fs_info->dev_root; 1083edbd8d4eSChris Mason 10845eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 10855eda7b5eSChris Mason (unsigned long)location->objectid); 10865eda7b5eSChris Mason if (root) 10875eda7b5eSChris Mason return root; 10885eda7b5eSChris Mason 1089e02119d5SChris Mason root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); 10905eda7b5eSChris Mason if (IS_ERR(root)) 10915eda7b5eSChris Mason return root; 1092*3394e160SChris Mason 1093*3394e160SChris Mason set_anon_super(&root->anon_super, NULL); 1094*3394e160SChris Mason 10952619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 10962619ba1fSChris Mason (unsigned long)root->root_key.objectid, 10970f7d52f4SChris Mason root); 10980f7d52f4SChris Mason if (ret) { 10995f39d397SChris Mason free_extent_buffer(root->node); 11000f7d52f4SChris Mason kfree(root); 11010f7d52f4SChris Mason return ERR_PTR(ret); 11020f7d52f4SChris Mason } 1103c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 1104edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 1105edbd8d4eSChris Mason root->root_key.objectid, root); 1106edbd8d4eSChris Mason BUG_ON(ret); 1107c146afadSYan Zheng btrfs_orphan_cleanup(root); 1108c146afadSYan Zheng } 1109edbd8d4eSChris Mason return root; 1110edbd8d4eSChris Mason } 1111edbd8d4eSChris Mason 1112edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 1113edbd8d4eSChris Mason struct btrfs_key *location, 1114edbd8d4eSChris Mason const char *name, int namelen) 1115edbd8d4eSChris Mason { 1116edbd8d4eSChris Mason struct btrfs_root *root; 1117edbd8d4eSChris Mason int ret; 1118edbd8d4eSChris Mason 1119edbd8d4eSChris Mason root = btrfs_read_fs_root_no_name(fs_info, location); 1120edbd8d4eSChris Mason if (!root) 1121edbd8d4eSChris Mason return NULL; 112258176a96SJosef Bacik 11234313b399SChris Mason if (root->in_sysfs) 11244313b399SChris Mason return root; 11254313b399SChris Mason 112658176a96SJosef Bacik ret = btrfs_set_root_name(root, name, namelen); 112758176a96SJosef Bacik if (ret) { 11285f39d397SChris Mason free_extent_buffer(root->node); 112958176a96SJosef Bacik kfree(root); 113058176a96SJosef Bacik return ERR_PTR(ret); 113158176a96SJosef Bacik } 113258176a96SJosef Bacik 113358176a96SJosef Bacik ret = btrfs_sysfs_add_root(root); 113458176a96SJosef Bacik if (ret) { 11355f39d397SChris Mason free_extent_buffer(root->node); 113658176a96SJosef Bacik kfree(root->name); 113758176a96SJosef Bacik kfree(root); 113858176a96SJosef Bacik return ERR_PTR(ret); 113958176a96SJosef Bacik } 11404313b399SChris Mason root->in_sysfs = 1; 11410f7d52f4SChris Mason return root; 11420f7d52f4SChris Mason } 114319c00ddcSChris Mason #if 0 114419c00ddcSChris Mason static int add_hasher(struct btrfs_fs_info *info, char *type) { 114519c00ddcSChris Mason struct btrfs_hasher *hasher; 11460f7d52f4SChris Mason 114719c00ddcSChris Mason hasher = kmalloc(sizeof(*hasher), GFP_NOFS); 114819c00ddcSChris Mason if (!hasher) 114919c00ddcSChris Mason return -ENOMEM; 115019c00ddcSChris Mason hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC); 115119c00ddcSChris Mason if (!hasher->hash_tfm) { 115219c00ddcSChris Mason kfree(hasher); 115319c00ddcSChris Mason return -EINVAL; 115419c00ddcSChris Mason } 115519c00ddcSChris Mason spin_lock(&info->hash_lock); 115619c00ddcSChris Mason list_add(&hasher->list, &info->hashers); 115719c00ddcSChris Mason spin_unlock(&info->hash_lock); 115819c00ddcSChris Mason return 0; 115919c00ddcSChris Mason } 116019c00ddcSChris Mason #endif 116104160088SChris Mason 116204160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 116304160088SChris Mason { 116404160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 116504160088SChris Mason int ret = 0; 116604160088SChris Mason struct list_head *cur; 116704160088SChris Mason struct btrfs_device *device; 116804160088SChris Mason struct backing_dev_info *bdi; 11696f3577bdSChris Mason #if 0 1170cb03c743SChris Mason if ((bdi_bits & (1 << BDI_write_congested)) && 1171777e6bd7SChris Mason btrfs_congested_async(info, 0)) 1172cb03c743SChris Mason return 1; 11736f3577bdSChris Mason #endif 117404160088SChris Mason list_for_each(cur, &info->fs_devices->devices) { 117504160088SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 1176dfe25020SChris Mason if (!device->bdev) 1177dfe25020SChris Mason continue; 117804160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 117904160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 118004160088SChris Mason ret = 1; 118104160088SChris Mason break; 118204160088SChris Mason } 118304160088SChris Mason } 118404160088SChris Mason return ret; 118504160088SChris Mason } 118604160088SChris Mason 118738b66988SChris Mason /* 118838b66988SChris Mason * this unplugs every device on the box, and it is only used when page 118938b66988SChris Mason * is null 119038b66988SChris Mason */ 119138b66988SChris Mason static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 119238b66988SChris Mason { 119338b66988SChris Mason struct list_head *cur; 119438b66988SChris Mason struct btrfs_device *device; 119538b66988SChris Mason struct btrfs_fs_info *info; 119638b66988SChris Mason 119738b66988SChris Mason info = (struct btrfs_fs_info *)bdi->unplug_io_data; 119838b66988SChris Mason list_for_each(cur, &info->fs_devices->devices) { 119938b66988SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 120038b66988SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 120138b66988SChris Mason if (bdi->unplug_io_fn) { 120238b66988SChris Mason bdi->unplug_io_fn(bdi, page); 120338b66988SChris Mason } 120438b66988SChris Mason } 120538b66988SChris Mason } 120638b66988SChris Mason 120704160088SChris Mason void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 120804160088SChris Mason { 120938b66988SChris Mason struct inode *inode; 1210f2d8d74dSChris Mason struct extent_map_tree *em_tree; 1211f2d8d74dSChris Mason struct extent_map *em; 1212bcbfce8aSChris Mason struct address_space *mapping; 121338b66988SChris Mason u64 offset; 121438b66988SChris Mason 1215bcbfce8aSChris Mason /* the generic O_DIRECT read code does this */ 121638b66988SChris Mason if (!page) { 121738b66988SChris Mason __unplug_io_fn(bdi, page); 121838b66988SChris Mason return; 121938b66988SChris Mason } 122038b66988SChris Mason 1221bcbfce8aSChris Mason /* 1222bcbfce8aSChris Mason * page->mapping may change at any time. Get a consistent copy 1223bcbfce8aSChris Mason * and use that for everything below 1224bcbfce8aSChris Mason */ 1225bcbfce8aSChris Mason smp_mb(); 1226bcbfce8aSChris Mason mapping = page->mapping; 1227bcbfce8aSChris Mason if (!mapping) 1228bcbfce8aSChris Mason return; 1229bcbfce8aSChris Mason 1230bcbfce8aSChris Mason inode = mapping->host; 1231240d5d48SChris Mason 1232240d5d48SChris Mason /* 1233240d5d48SChris Mason * don't do the expensive searching for a small number of 1234240d5d48SChris Mason * devices 1235240d5d48SChris Mason */ 1236240d5d48SChris Mason if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { 1237240d5d48SChris Mason __unplug_io_fn(bdi, page); 1238240d5d48SChris Mason return; 1239240d5d48SChris Mason } 1240240d5d48SChris Mason 124138b66988SChris Mason offset = page_offset(page); 124204160088SChris Mason 1243f2d8d74dSChris Mason em_tree = &BTRFS_I(inode)->extent_tree; 1244f2d8d74dSChris Mason spin_lock(&em_tree->lock); 1245f2d8d74dSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 1246f2d8d74dSChris Mason spin_unlock(&em_tree->lock); 124789642229SChris Mason if (!em) { 124889642229SChris Mason __unplug_io_fn(bdi, page); 1249f2d8d74dSChris Mason return; 125089642229SChris Mason } 1251f2d8d74dSChris Mason 125289642229SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 125389642229SChris Mason free_extent_map(em); 125489642229SChris Mason __unplug_io_fn(bdi, page); 125589642229SChris Mason return; 125689642229SChris Mason } 1257f2d8d74dSChris Mason offset = offset - em->start; 1258f2d8d74dSChris Mason btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, 1259f2d8d74dSChris Mason em->block_start + offset, page); 1260f2d8d74dSChris Mason free_extent_map(em); 126104160088SChris Mason } 126204160088SChris Mason 126304160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 126404160088SChris Mason { 126504160088SChris Mason bdi_init(bdi); 12664575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 126704160088SChris Mason bdi->state = 0; 126804160088SChris Mason bdi->capabilities = default_backing_dev_info.capabilities; 126904160088SChris Mason bdi->unplug_io_fn = btrfs_unplug_io_fn; 127004160088SChris Mason bdi->unplug_io_data = info; 127104160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 127204160088SChris Mason bdi->congested_data = info; 127304160088SChris Mason return 0; 127404160088SChris Mason } 127504160088SChris Mason 1276ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1277ce9adaa5SChris Mason { 1278ce9adaa5SChris Mason u64 length = 0; 1279ce9adaa5SChris Mason u64 buf_len = 0; 1280ce9adaa5SChris Mason u64 start = 0; 1281ce9adaa5SChris Mason struct page *page; 1282ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1283ce9adaa5SChris Mason struct btrfs_fs_info *info = NULL; 1284ce9adaa5SChris Mason struct bio_vec *bvec; 1285ce9adaa5SChris Mason int i; 1286ce9adaa5SChris Mason int ret; 1287ce9adaa5SChris Mason 1288ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1289ce9adaa5SChris Mason page = bvec->bv_page; 1290ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1291ce9adaa5SChris Mason length += bvec->bv_len; 1292ce9adaa5SChris Mason continue; 1293ce9adaa5SChris Mason } 1294ce9adaa5SChris Mason if (!page->private) { 1295ce9adaa5SChris Mason length += bvec->bv_len; 1296ce9adaa5SChris Mason continue; 1297ce9adaa5SChris Mason } 1298ce9adaa5SChris Mason length = bvec->bv_len; 1299ce9adaa5SChris Mason buf_len = page->private >> 2; 1300ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1301ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1302ce9adaa5SChris Mason info = BTRFS_I(page->mapping->host)->root->fs_info; 1303ce9adaa5SChris Mason } 1304ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1305ce9adaa5SChris Mason if (buf_len <= length) 1306ce9adaa5SChris Mason return 1; 1307ce9adaa5SChris Mason 1308ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1309ce9adaa5SChris Mason start + buf_len - 1); 1310ce9adaa5SChris Mason if (ret == 1) 1311ce9adaa5SChris Mason return ret; 1312ce9adaa5SChris Mason return ret; 1313ce9adaa5SChris Mason } 1314ce9adaa5SChris Mason 13158b712842SChris Mason /* 13168b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 13178b712842SChris Mason * functions. This is where read checksum verification actually happens 13188b712842SChris Mason */ 13198b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1320ce9adaa5SChris Mason { 1321ce9adaa5SChris Mason struct bio *bio; 13228b712842SChris Mason struct end_io_wq *end_io_wq; 13238b712842SChris Mason struct btrfs_fs_info *fs_info; 1324ce9adaa5SChris Mason int error; 1325ce9adaa5SChris Mason 13268b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1327ce9adaa5SChris Mason bio = end_io_wq->bio; 13288b712842SChris Mason fs_info = end_io_wq->info; 13298b712842SChris Mason 13308b712842SChris Mason /* metadata bios are special because the whole tree block must 13318b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 13328b712842SChris Mason * ram and up to date before trying to verify things. For 13338b712842SChris Mason * blocksize <= pagesize, it is basically a noop 13348b712842SChris Mason */ 133522c59948SChris Mason if (end_io_wq->metadata && !bio_ready_for_csum(bio)) { 13368b712842SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 13378b712842SChris Mason &end_io_wq->work); 1338ce9adaa5SChris Mason return; 1339ce9adaa5SChris Mason } 1340ce9adaa5SChris Mason error = end_io_wq->error; 1341ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1342ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1343ce9adaa5SChris Mason kfree(end_io_wq); 1344ce9adaa5SChris Mason bio_endio(bio, error); 1345ce9adaa5SChris Mason } 134644b8bd7eSChris Mason 1347a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1348a74a4b97SChris Mason { 1349a74a4b97SChris Mason struct btrfs_root *root = arg; 1350a74a4b97SChris Mason 1351a74a4b97SChris Mason do { 1352a74a4b97SChris Mason smp_mb(); 1353a74a4b97SChris Mason if (root->fs_info->closing) 1354a74a4b97SChris Mason break; 1355a74a4b97SChris Mason 1356a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1357a74a4b97SChris Mason mutex_lock(&root->fs_info->cleaner_mutex); 1358a74a4b97SChris Mason btrfs_clean_old_snapshots(root); 1359a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 1360a74a4b97SChris Mason 1361a74a4b97SChris Mason if (freezing(current)) { 1362a74a4b97SChris Mason refrigerator(); 1363a74a4b97SChris Mason } else { 1364a74a4b97SChris Mason smp_mb(); 1365a74a4b97SChris Mason if (root->fs_info->closing) 1366a74a4b97SChris Mason break; 1367a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 1368a74a4b97SChris Mason schedule(); 1369a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1370a74a4b97SChris Mason } 1371a74a4b97SChris Mason } while (!kthread_should_stop()); 1372a74a4b97SChris Mason return 0; 1373a74a4b97SChris Mason } 1374a74a4b97SChris Mason 1375a74a4b97SChris Mason static int transaction_kthread(void *arg) 1376a74a4b97SChris Mason { 1377a74a4b97SChris Mason struct btrfs_root *root = arg; 1378a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1379a74a4b97SChris Mason struct btrfs_transaction *cur; 1380a74a4b97SChris Mason unsigned long now; 1381a74a4b97SChris Mason unsigned long delay; 1382a74a4b97SChris Mason int ret; 1383a74a4b97SChris Mason 1384a74a4b97SChris Mason do { 1385a74a4b97SChris Mason smp_mb(); 1386a74a4b97SChris Mason if (root->fs_info->closing) 1387a74a4b97SChris Mason break; 1388a74a4b97SChris Mason 1389a74a4b97SChris Mason delay = HZ * 30; 1390a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1391a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1392a74a4b97SChris Mason 1393ab78c84dSChris Mason if (root->fs_info->total_ref_cache_size > 20 * 1024 * 1024) { 139431153d81SYan Zheng printk("btrfs: total reference cache size %Lu\n", 139531153d81SYan Zheng root->fs_info->total_ref_cache_size); 1396ab78c84dSChris Mason } 139731153d81SYan Zheng 1398a74a4b97SChris Mason mutex_lock(&root->fs_info->trans_mutex); 1399a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1400a74a4b97SChris Mason if (!cur) { 1401a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1402a74a4b97SChris Mason goto sleep; 1403a74a4b97SChris Mason } 140431153d81SYan Zheng 1405a74a4b97SChris Mason now = get_seconds(); 1406a74a4b97SChris Mason if (now < cur->start_time || now - cur->start_time < 30) { 1407a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1408a74a4b97SChris Mason delay = HZ * 5; 1409a74a4b97SChris Mason goto sleep; 1410a74a4b97SChris Mason } 1411a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1412a74a4b97SChris Mason trans = btrfs_start_transaction(root, 1); 1413a74a4b97SChris Mason ret = btrfs_commit_transaction(trans, root); 1414a74a4b97SChris Mason sleep: 1415a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1416a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1417a74a4b97SChris Mason 1418a74a4b97SChris Mason if (freezing(current)) { 1419a74a4b97SChris Mason refrigerator(); 1420a74a4b97SChris Mason } else { 1421a74a4b97SChris Mason if (root->fs_info->closing) 1422a74a4b97SChris Mason break; 1423a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 1424a74a4b97SChris Mason schedule_timeout(delay); 1425a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1426a74a4b97SChris Mason } 1427a74a4b97SChris Mason } while (!kthread_should_stop()); 1428a74a4b97SChris Mason return 0; 1429a74a4b97SChris Mason } 1430a74a4b97SChris Mason 14318a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 1432dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1433dfe25020SChris Mason char *options) 1434eb60ceacSChris Mason { 1435db94535dSChris Mason u32 sectorsize; 1436db94535dSChris Mason u32 nodesize; 1437db94535dSChris Mason u32 leafsize; 1438db94535dSChris Mason u32 blocksize; 143987ee04ebSChris Mason u32 stripesize; 144084234f3aSYan Zheng u64 generation; 14413de4586cSChris Mason struct btrfs_key location; 1442a061fc8dSChris Mason struct buffer_head *bh; 1443e02119d5SChris Mason struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), 1444e20d96d6SChris Mason GFP_NOFS); 1445e02119d5SChris Mason struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root), 1446e20d96d6SChris Mason GFP_NOFS); 14478790d502SChris Mason struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), 1448e20d96d6SChris Mason GFP_NOFS); 1449e02119d5SChris Mason struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), 14500b86a832SChris Mason GFP_NOFS); 1451e02119d5SChris Mason struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), 14520b86a832SChris Mason GFP_NOFS); 1453e02119d5SChris Mason struct btrfs_root *log_tree_root; 1454e02119d5SChris Mason 1455eb60ceacSChris Mason int ret; 1456e58ca020SYan int err = -EINVAL; 14574543df7eSChris Mason 14582c90e5d6SChris Mason struct btrfs_super_block *disk_super; 14598790d502SChris Mason 14600463bb4eSJim Meyering if (!extent_root || !tree_root || !fs_info || 14610463bb4eSJim Meyering !chunk_root || !dev_root) { 146239279cc3SChris Mason err = -ENOMEM; 146339279cc3SChris Mason goto fail; 146439279cc3SChris Mason } 14650f7d52f4SChris Mason INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); 14668fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1467facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 146819c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1469ea8c2819SChris Mason INIT_LIST_HEAD(&fs_info->delalloc_inodes); 147019c00ddcSChris Mason spin_lock_init(&fs_info->hash_lock); 14711832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1472cee36a03SChris Mason spin_lock_init(&fs_info->new_trans_lock); 147331153d81SYan Zheng spin_lock_init(&fs_info->ref_cache_lock); 147419c00ddcSChris Mason 147558176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 14769f5fae2fSChris Mason fs_info->tree_root = tree_root; 14779f5fae2fSChris Mason fs_info->extent_root = extent_root; 14780b86a832SChris Mason fs_info->chunk_root = chunk_root; 14790b86a832SChris Mason fs_info->dev_root = dev_root; 14808a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 14810b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 14826324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 14830b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1484cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 1485771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 14868c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 14870986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 1488a2135011SChris Mason atomic_set(&fs_info->throttles, 0); 1489ab78c84dSChris Mason atomic_set(&fs_info->throttle_gen, 0); 1490e20d96d6SChris Mason fs_info->sb = sb; 1491c59f8951SChris Mason fs_info->max_extent = (u64)-1; 14926f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 149304160088SChris Mason setup_bdi(fs_info, &fs_info->bdi); 1494d98237b3SChris Mason fs_info->btree_inode = new_inode(sb); 1495d98237b3SChris Mason fs_info->btree_inode->i_ino = 1; 14962c90e5d6SChris Mason fs_info->btree_inode->i_nlink = 1; 1497c8b97818SChris Mason 14984543df7eSChris Mason fs_info->thread_pool_size = min(num_online_cpus() + 2, 8); 14990afbaf8cSChris Mason 15003eaa2885SChris Mason INIT_LIST_HEAD(&fs_info->ordered_extents); 15013eaa2885SChris Mason spin_lock_init(&fs_info->ordered_extent_lock); 15023eaa2885SChris Mason 1503a061fc8dSChris Mason sb->s_blocksize = 4096; 1504a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 1505a061fc8dSChris Mason 15060afbaf8cSChris Mason /* 15070afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 15080afbaf8cSChris Mason * the real end of the address space is determined by all of 15090afbaf8cSChris Mason * the devices in the system 15100afbaf8cSChris Mason */ 15110afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 1512d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 151304160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 151404160088SChris Mason 1515d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 15165f39d397SChris Mason fs_info->btree_inode->i_mapping, 15175f39d397SChris Mason GFP_NOFS); 1518d1310b2eSChris Mason extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, 1519d1310b2eSChris Mason GFP_NOFS); 15200da5468fSChris Mason 1521d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 1522d1310b2eSChris Mason 15230f9dd46cSJosef Bacik spin_lock_init(&fs_info->block_group_cache_lock); 15240f9dd46cSJosef Bacik fs_info->block_group_cache_tree.rb_node = NULL; 15250f9dd46cSJosef Bacik 1526d1310b2eSChris Mason extent_io_tree_init(&fs_info->pinned_extents, 15271a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1528d1310b2eSChris Mason extent_io_tree_init(&fs_info->pending_del, 15291a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1530d1310b2eSChris Mason extent_io_tree_init(&fs_info->extent_ins, 15311a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1532e66f709bSChris Mason fs_info->do_barriers = 1; 1533e18e4809SChris Mason 15341a40e23bSZheng Yan INIT_LIST_HEAD(&fs_info->dead_reloc_roots); 15351a40e23bSZheng Yan btrfs_leaf_ref_tree_init(&fs_info->reloc_ref_tree); 1536e4657689SZheng Yan btrfs_leaf_ref_tree_init(&fs_info->shared_ref_tree); 1537e4657689SZheng Yan 15380f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 15390f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 15400f7d52f4SChris Mason sizeof(struct btrfs_key)); 154122b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 154239279cc3SChris Mason 154379154b1bSChris Mason mutex_init(&fs_info->trans_mutex); 1544e02119d5SChris Mason mutex_init(&fs_info->tree_log_mutex); 1545a2135011SChris Mason mutex_init(&fs_info->drop_mutex); 154625179201SJosef Bacik mutex_init(&fs_info->extent_ins_mutex); 154725179201SJosef Bacik mutex_init(&fs_info->pinned_mutex); 1548925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 1549a74a4b97SChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 1550a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 15517d9eb12cSChris Mason mutex_init(&fs_info->volume_mutex); 15521a40e23bSZheng Yan mutex_init(&fs_info->tree_reloc_mutex); 1553e6dcd2dcSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 1554f9295749SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 15554854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 1556e02119d5SChris Mason init_waitqueue_head(&fs_info->tree_log_wait); 1557e02119d5SChris Mason atomic_set(&fs_info->tree_log_commit, 0); 1558e02119d5SChris Mason atomic_set(&fs_info->tree_log_writers, 0); 1559e02119d5SChris Mason fs_info->tree_log_transid = 0; 15603768f368SChris Mason 156119c00ddcSChris Mason #if 0 156219c00ddcSChris Mason ret = add_hasher(fs_info, "crc32c"); 156319c00ddcSChris Mason if (ret) { 156419c00ddcSChris Mason printk("btrfs: failed hash setup, modprobe cryptomgr?\n"); 156519c00ddcSChris Mason err = -ENOMEM; 156619c00ddcSChris Mason goto fail_iput; 156719c00ddcSChris Mason } 156819c00ddcSChris Mason #endif 15690b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 15702c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 15717eccb903SChris Mason 1572d98237b3SChris Mason 1573a061fc8dSChris Mason bh = __bread(fs_devices->latest_bdev, 1574a061fc8dSChris Mason BTRFS_SUPER_INFO_OFFSET / 4096, 4096); 1575a061fc8dSChris Mason if (!bh) 157639279cc3SChris Mason goto fail_iput; 157739279cc3SChris Mason 1578a061fc8dSChris Mason memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); 1579a061fc8dSChris Mason brelse(bh); 15805f39d397SChris Mason 1581a061fc8dSChris Mason memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); 15820b86a832SChris Mason 15835f39d397SChris Mason disk_super = &fs_info->super_copy; 15840f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 158539279cc3SChris Mason goto fail_sb_buffer; 15860f7d52f4SChris Mason 15872b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 15882b82032cSYan Zheng if (ret) { 15892b82032cSYan Zheng err = ret; 1590edf24abeSChristoph Hellwig goto fail_sb_buffer; 15912b82032cSYan Zheng } 1592dfe25020SChris Mason 15934543df7eSChris Mason /* 15944543df7eSChris Mason * we need to start all the end_io workers up front because the 15954543df7eSChris Mason * queue work function gets called at interrupt time, and so it 15964543df7eSChris Mason * cannot dynamically grow. 15974543df7eSChris Mason */ 15985443be45SChris Mason btrfs_init_workers(&fs_info->workers, "worker", 15995443be45SChris Mason fs_info->thread_pool_size); 1600c8b97818SChris Mason 1601771ed689SChris Mason btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", 1602771ed689SChris Mason fs_info->thread_pool_size); 1603771ed689SChris Mason 16045443be45SChris Mason btrfs_init_workers(&fs_info->submit_workers, "submit", 1605b720d209SChris Mason min_t(u64, fs_devices->num_devices, 1606b720d209SChris Mason fs_info->thread_pool_size)); 160761b49440SChris Mason 160861b49440SChris Mason /* a higher idle thresh on the submit workers makes it much more 160961b49440SChris Mason * likely that bios will be send down in a sane order to the 161061b49440SChris Mason * devices 161161b49440SChris Mason */ 161261b49440SChris Mason fs_info->submit_workers.idle_thresh = 64; 161353863232SChris Mason 1614771ed689SChris Mason fs_info->workers.idle_thresh = 16; 16154a69a410SChris Mason fs_info->workers.ordered = 1; 161661b49440SChris Mason 1617771ed689SChris Mason fs_info->delalloc_workers.idle_thresh = 2; 1618771ed689SChris Mason fs_info->delalloc_workers.ordered = 1; 1619771ed689SChris Mason 16205443be45SChris Mason btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1); 16215443be45SChris Mason btrfs_init_workers(&fs_info->endio_workers, "endio", 16225443be45SChris Mason fs_info->thread_pool_size); 16235443be45SChris Mason btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", 1624e6dcd2dcSChris Mason fs_info->thread_pool_size); 162561b49440SChris Mason 162661b49440SChris Mason /* 162761b49440SChris Mason * endios are largely parallel and should have a very 162861b49440SChris Mason * low idle thresh 162961b49440SChris Mason */ 163061b49440SChris Mason fs_info->endio_workers.idle_thresh = 4; 16313a5f1d45SChris Mason fs_info->endio_write_workers.idle_thresh = 64; 163261b49440SChris Mason 16334543df7eSChris Mason btrfs_start_workers(&fs_info->workers, 1); 16341cc127b5SChris Mason btrfs_start_workers(&fs_info->submit_workers, 1); 1635771ed689SChris Mason btrfs_start_workers(&fs_info->delalloc_workers, 1); 1636247e743cSChris Mason btrfs_start_workers(&fs_info->fixup_workers, 1); 16374543df7eSChris Mason btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size); 1638e6dcd2dcSChris Mason btrfs_start_workers(&fs_info->endio_write_workers, 1639e6dcd2dcSChris Mason fs_info->thread_pool_size); 16404543df7eSChris Mason 16414575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 1642c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 1643c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 16444575c9ccSChris Mason 1645db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 1646db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 1647db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 164887ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 1649db94535dSChris Mason tree_root->nodesize = nodesize; 1650db94535dSChris Mason tree_root->leafsize = leafsize; 1651db94535dSChris Mason tree_root->sectorsize = sectorsize; 165287ee04ebSChris Mason tree_root->stripesize = stripesize; 1653a061fc8dSChris Mason 1654a061fc8dSChris Mason sb->s_blocksize = sectorsize; 1655a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 1656db94535dSChris Mason 165739279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 165839279cc3SChris Mason sizeof(disk_super->magic))) { 165939279cc3SChris Mason printk("btrfs: valid FS not found on %s\n", sb->s_id); 166039279cc3SChris Mason goto fail_sb_buffer; 166139279cc3SChris Mason } 166219c00ddcSChris Mason 1663925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 16640b86a832SChris Mason ret = btrfs_read_sys_array(tree_root); 1665925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 166684eed90fSChris Mason if (ret) { 166784eed90fSChris Mason printk("btrfs: failed to read the system array on %s\n", 166884eed90fSChris Mason sb->s_id); 166984eed90fSChris Mason goto fail_sys_array; 167084eed90fSChris Mason } 16710b86a832SChris Mason 16720b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 16730b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 167484234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 16750b86a832SChris Mason 16760b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 16770b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 16780b86a832SChris Mason 16790b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 16800b86a832SChris Mason btrfs_super_chunk_root(disk_super), 168184234f3aSYan Zheng blocksize, generation); 16820b86a832SChris Mason BUG_ON(!chunk_root->node); 16830b86a832SChris Mason 1684e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 1685e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 1686e17cade2SChris Mason BTRFS_UUID_SIZE); 1687e17cade2SChris Mason 1688925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 16890b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 1690925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 16912b82032cSYan Zheng if (ret) { 16922b82032cSYan Zheng printk("btrfs: failed to read chunk tree on %s\n", sb->s_id); 16932b82032cSYan Zheng goto fail_chunk_root; 16942b82032cSYan Zheng } 16950b86a832SChris Mason 1696dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 1697dfe25020SChris Mason 1698db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 1699db94535dSChris Mason btrfs_super_root_level(disk_super)); 170084234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 17010b86a832SChris Mason 1702e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 1703db94535dSChris Mason btrfs_super_root(disk_super), 170484234f3aSYan Zheng blocksize, generation); 170539279cc3SChris Mason if (!tree_root->node) 17062b82032cSYan Zheng goto fail_chunk_root; 17073768f368SChris Mason 1708db94535dSChris Mason 1709db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 1710e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 17110b86a832SChris Mason if (ret) 171239279cc3SChris Mason goto fail_tree_root; 17130b86a832SChris Mason extent_root->track_dirty = 1; 17140b86a832SChris Mason 17150b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 17160b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 17170b86a832SChris Mason dev_root->track_dirty = 1; 17180b86a832SChris Mason 17190b86a832SChris Mason if (ret) 17200b86a832SChris Mason goto fail_extent_root; 17213768f368SChris Mason 17229078a3e1SChris Mason btrfs_read_block_groups(extent_root); 17239078a3e1SChris Mason 1724c146afadSYan Zheng fs_info->generation = generation + 1; 1725c146afadSYan Zheng fs_info->last_trans_committed = generation; 1726d18a2c44SChris Mason fs_info->data_alloc_profile = (u64)-1; 1727d18a2c44SChris Mason fs_info->metadata_alloc_profile = (u64)-1; 1728611f0e00SChris Mason fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 1729a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 1730a74a4b97SChris Mason "btrfs-cleaner"); 1731a74a4b97SChris Mason if (!fs_info->cleaner_kthread) 1732a74a4b97SChris Mason goto fail_extent_root; 1733a74a4b97SChris Mason 1734a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 1735a74a4b97SChris Mason tree_root, 1736a74a4b97SChris Mason "btrfs-transaction"); 1737a74a4b97SChris Mason if (!fs_info->transaction_kthread) 17383f157a2fSChris Mason goto fail_cleaner; 1739a74a4b97SChris Mason 1740c146afadSYan Zheng if (sb->s_flags & MS_RDONLY) 17413de4586cSChris Mason goto read_fs_root; 1742c146afadSYan Zheng 1743e02119d5SChris Mason if (btrfs_super_log_root(disk_super) != 0) { 1744e02119d5SChris Mason u32 blocksize; 1745e02119d5SChris Mason u64 bytenr = btrfs_super_log_root(disk_super); 1746d18a2c44SChris Mason 1747e02119d5SChris Mason blocksize = 1748e02119d5SChris Mason btrfs_level_size(tree_root, 1749e02119d5SChris Mason btrfs_super_log_root_level(disk_super)); 1750e02119d5SChris Mason 1751e02119d5SChris Mason log_tree_root = kzalloc(sizeof(struct btrfs_root), 1752e02119d5SChris Mason GFP_NOFS); 1753e02119d5SChris Mason 1754e02119d5SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 1755e02119d5SChris Mason log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1756e02119d5SChris Mason 1757e02119d5SChris Mason log_tree_root->node = read_tree_block(tree_root, bytenr, 175884234f3aSYan Zheng blocksize, 175984234f3aSYan Zheng generation + 1); 1760e02119d5SChris Mason ret = btrfs_recover_log_trees(log_tree_root); 1761e02119d5SChris Mason BUG_ON(ret); 1762e02119d5SChris Mason } 17631a40e23bSZheng Yan 17641a40e23bSZheng Yan ret = btrfs_cleanup_reloc_trees(tree_root); 17651a40e23bSZheng Yan BUG_ON(ret); 17661a40e23bSZheng Yan 17673de4586cSChris Mason location.objectid = BTRFS_FS_TREE_OBJECTID; 17683de4586cSChris Mason location.type = BTRFS_ROOT_ITEM_KEY; 17693de4586cSChris Mason location.offset = (u64)-1; 17703de4586cSChris Mason 17713de4586cSChris Mason read_fs_root: 17723de4586cSChris Mason fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); 17733de4586cSChris Mason if (!fs_info->fs_root) 17743de4586cSChris Mason goto fail_cleaner; 17750f7d52f4SChris Mason return tree_root; 177639279cc3SChris Mason 17773f157a2fSChris Mason fail_cleaner: 1778a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 17790b86a832SChris Mason fail_extent_root: 17800b86a832SChris Mason free_extent_buffer(extent_root->node); 178139279cc3SChris Mason fail_tree_root: 17825f39d397SChris Mason free_extent_buffer(tree_root->node); 17832b82032cSYan Zheng fail_chunk_root: 17842b82032cSYan Zheng free_extent_buffer(chunk_root->node); 178584eed90fSChris Mason fail_sys_array: 178639279cc3SChris Mason fail_sb_buffer: 1787247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 1788771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 17898b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 17908b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 1791e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 17921cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 17934543df7eSChris Mason fail_iput: 17944543df7eSChris Mason iput(fs_info->btree_inode); 179539279cc3SChris Mason fail: 1796dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 179784eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 179884eed90fSChris Mason 179939279cc3SChris Mason kfree(extent_root); 180039279cc3SChris Mason kfree(tree_root); 18012d2ae547SChris Mason bdi_destroy(&fs_info->bdi); 180239279cc3SChris Mason kfree(fs_info); 180383afeac4SJim Meyering kfree(chunk_root); 180483afeac4SJim Meyering kfree(dev_root); 180539279cc3SChris Mason return ERR_PTR(err); 1806eb60ceacSChris Mason } 1807eb60ceacSChris Mason 1808f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 1809f2984462SChris Mason { 1810f2984462SChris Mason char b[BDEVNAME_SIZE]; 1811f2984462SChris Mason 1812f2984462SChris Mason if (uptodate) { 1813f2984462SChris Mason set_buffer_uptodate(bh); 1814f2984462SChris Mason } else { 1815f2984462SChris Mason if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { 1816f2984462SChris Mason printk(KERN_WARNING "lost page write due to " 1817f2984462SChris Mason "I/O error on %s\n", 1818f2984462SChris Mason bdevname(bh->b_bdev, b)); 1819f2984462SChris Mason } 18201259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 18211259ab75SChris Mason * our own ways of dealing with the IO errors 18221259ab75SChris Mason */ 1823f2984462SChris Mason clear_buffer_uptodate(bh); 1824f2984462SChris Mason } 1825f2984462SChris Mason unlock_buffer(bh); 1826f2984462SChris Mason put_bh(bh); 1827f2984462SChris Mason } 1828f2984462SChris Mason 1829f2984462SChris Mason int write_all_supers(struct btrfs_root *root) 1830f2984462SChris Mason { 1831f2984462SChris Mason struct list_head *cur; 1832f2984462SChris Mason struct list_head *head = &root->fs_info->fs_devices->devices; 1833f2984462SChris Mason struct btrfs_device *dev; 1834a061fc8dSChris Mason struct btrfs_super_block *sb; 1835f2984462SChris Mason struct btrfs_dev_item *dev_item; 1836f2984462SChris Mason struct buffer_head *bh; 1837f2984462SChris Mason int ret; 1838f2984462SChris Mason int do_barriers; 1839a236aed1SChris Mason int max_errors; 1840a236aed1SChris Mason int total_errors = 0; 1841a061fc8dSChris Mason u32 crc; 1842a061fc8dSChris Mason u64 flags; 1843f2984462SChris Mason 1844a236aed1SChris Mason max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; 1845f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 1846f2984462SChris Mason 1847a061fc8dSChris Mason sb = &root->fs_info->super_for_commit; 1848a061fc8dSChris Mason dev_item = &sb->dev_item; 1849f2984462SChris Mason list_for_each(cur, head) { 1850f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1851dfe25020SChris Mason if (!dev->bdev) { 1852dfe25020SChris Mason total_errors++; 1853dfe25020SChris Mason continue; 1854dfe25020SChris Mason } 18552b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 1856dfe25020SChris Mason continue; 1857dfe25020SChris Mason 18582b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 1859a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 1860a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 1861a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 1862a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 1863a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 1864a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 1865a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 1866a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 18672b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 1868a061fc8dSChris Mason flags = btrfs_super_flags(sb); 1869a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 1870f2984462SChris Mason 1871f2984462SChris Mason 1872a061fc8dSChris Mason crc = ~(u32)0; 1873a061fc8dSChris Mason crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc, 1874a061fc8dSChris Mason BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); 1875a061fc8dSChris Mason btrfs_csum_final(crc, sb->csum); 1876a061fc8dSChris Mason 1877a061fc8dSChris Mason bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 1878f2984462SChris Mason BTRFS_SUPER_INFO_SIZE); 1879f2984462SChris Mason 1880a061fc8dSChris Mason memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 1881f2984462SChris Mason dev->pending_io = bh; 1882f2984462SChris Mason 1883f2984462SChris Mason get_bh(bh); 1884f2984462SChris Mason set_buffer_uptodate(bh); 1885f2984462SChris Mason lock_buffer(bh); 1886f2984462SChris Mason bh->b_end_io = btrfs_end_buffer_write_sync; 1887f2984462SChris Mason 1888f2984462SChris Mason if (do_barriers && dev->barriers) { 1889f2984462SChris Mason ret = submit_bh(WRITE_BARRIER, bh); 1890f2984462SChris Mason if (ret == -EOPNOTSUPP) { 1891f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1892f2984462SChris Mason dev->name); 1893f2984462SChris Mason set_buffer_uptodate(bh); 1894f2984462SChris Mason dev->barriers = 0; 1895f2984462SChris Mason get_bh(bh); 1896f2984462SChris Mason lock_buffer(bh); 1897f2984462SChris Mason ret = submit_bh(WRITE, bh); 1898f2984462SChris Mason } 1899f2984462SChris Mason } else { 1900f2984462SChris Mason ret = submit_bh(WRITE, bh); 1901f2984462SChris Mason } 1902a236aed1SChris Mason if (ret) 1903a236aed1SChris Mason total_errors++; 1904f2984462SChris Mason } 1905a236aed1SChris Mason if (total_errors > max_errors) { 1906a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1907a236aed1SChris Mason BUG(); 1908a236aed1SChris Mason } 1909a236aed1SChris Mason total_errors = 0; 1910f2984462SChris Mason 1911f2984462SChris Mason list_for_each(cur, head) { 1912f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1913dfe25020SChris Mason if (!dev->bdev) 1914dfe25020SChris Mason continue; 19152b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 1916dfe25020SChris Mason continue; 1917dfe25020SChris Mason 1918f2984462SChris Mason BUG_ON(!dev->pending_io); 1919f2984462SChris Mason bh = dev->pending_io; 1920f2984462SChris Mason wait_on_buffer(bh); 1921f2984462SChris Mason if (!buffer_uptodate(dev->pending_io)) { 1922f2984462SChris Mason if (do_barriers && dev->barriers) { 1923f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1924f2984462SChris Mason dev->name); 1925f2984462SChris Mason set_buffer_uptodate(bh); 1926f2984462SChris Mason get_bh(bh); 1927f2984462SChris Mason lock_buffer(bh); 1928f2984462SChris Mason dev->barriers = 0; 1929f2984462SChris Mason ret = submit_bh(WRITE, bh); 1930f2984462SChris Mason BUG_ON(ret); 1931f2984462SChris Mason wait_on_buffer(bh); 19321259ab75SChris Mason if (!buffer_uptodate(bh)) 19331259ab75SChris Mason total_errors++; 1934f2984462SChris Mason } else { 1935a236aed1SChris Mason total_errors++; 1936f2984462SChris Mason } 1937f2984462SChris Mason 1938f2984462SChris Mason } 1939f2984462SChris Mason dev->pending_io = NULL; 1940f2984462SChris Mason brelse(bh); 1941f2984462SChris Mason } 1942a236aed1SChris Mason if (total_errors > max_errors) { 1943a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1944a236aed1SChris Mason BUG(); 1945a236aed1SChris Mason } 1946f2984462SChris Mason return 0; 1947f2984462SChris Mason } 1948f2984462SChris Mason 1949e089f05cSChris Mason int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root 195079154b1bSChris Mason *root) 1951cfaa7295SChris Mason { 1952e66f709bSChris Mason int ret; 19532c90e5d6SChris Mason 1954f2984462SChris Mason ret = write_all_supers(root); 19555f39d397SChris Mason return ret; 1956cfaa7295SChris Mason } 1957cfaa7295SChris Mason 19585eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 19592619ba1fSChris Mason { 19602619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 19612619ba1fSChris Mason (unsigned long)root->root_key.objectid); 1962*3394e160SChris Mason if (root->anon_super.s_dev) { 1963*3394e160SChris Mason down_write(&root->anon_super.s_umount); 1964*3394e160SChris Mason kill_anon_super(&root->anon_super); 1965*3394e160SChris Mason } 1966b99aa6cbSChris Mason if (root->in_sysfs) 196758176a96SJosef Bacik btrfs_sysfs_del_root(root); 19682619ba1fSChris Mason if (root->node) 19695f39d397SChris Mason free_extent_buffer(root->node); 19702619ba1fSChris Mason if (root->commit_root) 19715f39d397SChris Mason free_extent_buffer(root->commit_root); 197258176a96SJosef Bacik if (root->name) 197358176a96SJosef Bacik kfree(root->name); 19742619ba1fSChris Mason kfree(root); 19752619ba1fSChris Mason return 0; 19762619ba1fSChris Mason } 19772619ba1fSChris Mason 197835b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 19790f7d52f4SChris Mason { 19800f7d52f4SChris Mason int ret; 19810f7d52f4SChris Mason struct btrfs_root *gang[8]; 19820f7d52f4SChris Mason int i; 19830f7d52f4SChris Mason 19840f7d52f4SChris Mason while(1) { 19850f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 19860f7d52f4SChris Mason (void **)gang, 0, 19870f7d52f4SChris Mason ARRAY_SIZE(gang)); 19880f7d52f4SChris Mason if (!ret) 19890f7d52f4SChris Mason break; 19902619ba1fSChris Mason for (i = 0; i < ret; i++) 19915eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 19920f7d52f4SChris Mason } 19930f7d52f4SChris Mason return 0; 19940f7d52f4SChris Mason } 1995b4100d64SChris Mason 1996c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 1997c146afadSYan Zheng { 1998c146afadSYan Zheng u64 root_objectid = 0; 1999c146afadSYan Zheng struct btrfs_root *gang[8]; 2000c146afadSYan Zheng int i; 2001c146afadSYan Zheng int ret; 2002c146afadSYan Zheng 2003c146afadSYan Zheng while (1) { 2004c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 2005c146afadSYan Zheng (void **)gang, root_objectid, 2006c146afadSYan Zheng ARRAY_SIZE(gang)); 2007c146afadSYan Zheng if (!ret) 2008c146afadSYan Zheng break; 2009c146afadSYan Zheng for (i = 0; i < ret; i++) { 2010c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 2011c146afadSYan Zheng ret = btrfs_find_dead_roots(fs_info->tree_root, 2012c146afadSYan Zheng root_objectid, gang[i]); 2013c146afadSYan Zheng BUG_ON(ret); 2014c146afadSYan Zheng btrfs_orphan_cleanup(gang[i]); 2015c146afadSYan Zheng } 2016c146afadSYan Zheng root_objectid++; 2017c146afadSYan Zheng } 2018c146afadSYan Zheng return 0; 2019c146afadSYan Zheng } 2020c146afadSYan Zheng 2021c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 2022c146afadSYan Zheng { 2023c146afadSYan Zheng struct btrfs_trans_handle *trans; 2024c146afadSYan Zheng int ret; 2025c146afadSYan Zheng 2026c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 2027c146afadSYan Zheng btrfs_clean_old_snapshots(root); 2028c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 2029c146afadSYan Zheng trans = btrfs_start_transaction(root, 1); 2030c146afadSYan Zheng ret = btrfs_commit_transaction(trans, root); 2031c146afadSYan Zheng BUG_ON(ret); 2032c146afadSYan Zheng /* run commit again to drop the original snapshot */ 2033c146afadSYan Zheng trans = btrfs_start_transaction(root, 1); 2034c146afadSYan Zheng btrfs_commit_transaction(trans, root); 2035c146afadSYan Zheng ret = btrfs_write_and_wait_transaction(NULL, root); 2036c146afadSYan Zheng BUG_ON(ret); 2037c146afadSYan Zheng 2038c146afadSYan Zheng ret = write_ctree_super(NULL, root); 2039c146afadSYan Zheng return ret; 2040c146afadSYan Zheng } 2041c146afadSYan Zheng 2042e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 2043eb60ceacSChris Mason { 20440f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 2045c146afadSYan Zheng int ret; 2046e089f05cSChris Mason 2047facda1e7SChris Mason fs_info->closing = 1; 2048a2135011SChris Mason smp_mb(); 2049a2135011SChris Mason 2050a74a4b97SChris Mason kthread_stop(root->fs_info->transaction_kthread); 2051a74a4b97SChris Mason kthread_stop(root->fs_info->cleaner_kthread); 2052a74a4b97SChris Mason 2053c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 2054c146afadSYan Zheng ret = btrfs_commit_super(root); 2055c146afadSYan Zheng if (ret) { 2056c146afadSYan Zheng printk("btrfs: commit super returns %d\n", ret); 2057c146afadSYan Zheng } 2058c146afadSYan Zheng } 2059ed2ff2cbSChris Mason 2060b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 2061b0c68f8bSChris Mason printk("btrfs: at unmount delalloc count %Lu\n", 2062b0c68f8bSChris Mason fs_info->delalloc_bytes); 2063b0c68f8bSChris Mason } 206431153d81SYan Zheng if (fs_info->total_ref_cache_size) { 206531153d81SYan Zheng printk("btrfs: at umount reference cache size %Lu\n", 206631153d81SYan Zheng fs_info->total_ref_cache_size); 206731153d81SYan Zheng } 206831153d81SYan Zheng 20690f7d52f4SChris Mason if (fs_info->extent_root->node) 20705f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 2071f510cfecSChris Mason 20720f7d52f4SChris Mason if (fs_info->tree_root->node) 20735f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 2074f510cfecSChris Mason 20750b86a832SChris Mason if (root->fs_info->chunk_root->node); 20760b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 20770b86a832SChris Mason 20780b86a832SChris Mason if (root->fs_info->dev_root->node); 20790b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 20800b86a832SChris Mason 20819078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 2082c146afadSYan Zheng 20830f7d52f4SChris Mason del_fs_roots(fs_info); 2084d10c5f31SChris Mason 2085c146afadSYan Zheng iput(fs_info->btree_inode); 20869ad6b7bcSChris Mason 2087247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2088771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 20898b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 20908b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2091e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 20921cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 2093d6bfde87SChris Mason 209419c00ddcSChris Mason #if 0 209519c00ddcSChris Mason while(!list_empty(&fs_info->hashers)) { 209619c00ddcSChris Mason struct btrfs_hasher *hasher; 209719c00ddcSChris Mason hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher, 209819c00ddcSChris Mason hashers); 209919c00ddcSChris Mason list_del(&hasher->hashers); 210019c00ddcSChris Mason crypto_free_hash(&fs_info->hash_tfm); 210119c00ddcSChris Mason kfree(hasher); 210219c00ddcSChris Mason } 210319c00ddcSChris Mason #endif 2104dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 21050b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2106b248a415SChris Mason 210704160088SChris Mason bdi_destroy(&fs_info->bdi); 21080b86a832SChris Mason 21090f7d52f4SChris Mason kfree(fs_info->extent_root); 21100f7d52f4SChris Mason kfree(fs_info->tree_root); 21110b86a832SChris Mason kfree(fs_info->chunk_root); 21120b86a832SChris Mason kfree(fs_info->dev_root); 2113eb60ceacSChris Mason return 0; 2114eb60ceacSChris Mason } 2115eb60ceacSChris Mason 21161259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 2117ccd467d6SChris Mason { 21181259ab75SChris Mason int ret; 2119810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 21201259ab75SChris Mason 21211259ab75SChris Mason ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); 21221259ab75SChris Mason if (!ret) 21231259ab75SChris Mason return ret; 21241259ab75SChris Mason 21251259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 21261259ab75SChris Mason parent_transid); 21271259ab75SChris Mason return !ret; 21285f39d397SChris Mason } 21296702ed49SChris Mason 21305f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 21315f39d397SChris Mason { 2132810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 2133d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 21345f39d397SChris Mason buf); 21355f39d397SChris Mason } 21365f39d397SChris Mason 21375f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 21385f39d397SChris Mason { 2139810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 21405f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 21415f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 21426702ed49SChris Mason 2143925baeddSChris Mason WARN_ON(!btrfs_tree_locked(buf)); 2144ccd467d6SChris Mason if (transid != root->fs_info->generation) { 2145ccd467d6SChris Mason printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", 2146db94535dSChris Mason (unsigned long long)buf->start, 2147ccd467d6SChris Mason transid, root->fs_info->generation); 2148ccd467d6SChris Mason WARN_ON(1); 2149ccd467d6SChris Mason } 2150d1310b2eSChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); 2151eb60ceacSChris Mason } 2152eb60ceacSChris Mason 2153d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 215435b7e476SChris Mason { 2155188de649SChris Mason /* 2156188de649SChris Mason * looks as though older kernels can get into trouble with 2157188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 2158188de649SChris Mason */ 2159d6bfde87SChris Mason struct extent_io_tree *tree; 2160d6bfde87SChris Mason u64 num_dirty; 2161d6bfde87SChris Mason u64 start = 0; 2162771ed689SChris Mason unsigned long thresh = 32 * 1024 * 1024; 2163d6bfde87SChris Mason tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 2164d6bfde87SChris Mason 2165b64a2851SChris Mason if (current_is_pdflush() || current->flags & PF_MEMALLOC) 2166d6bfde87SChris Mason return; 2167d6bfde87SChris Mason 2168d6bfde87SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 2169d6bfde87SChris Mason thresh, EXTENT_DIRTY); 2170d6bfde87SChris Mason if (num_dirty > thresh) { 2171d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 2172304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 217335b7e476SChris Mason } 2174188de649SChris Mason return; 2175d6bfde87SChris Mason } 21766b80053dSChris Mason 2177ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 21786b80053dSChris Mason { 2179810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 2180ce9adaa5SChris Mason int ret; 2181ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 2182ce9adaa5SChris Mason if (ret == 0) { 2183ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 2184ce9adaa5SChris Mason } 2185ce9adaa5SChris Mason return ret; 21866b80053dSChris Mason } 21870da5468fSChris Mason 21884bef0848SChris Mason int btree_lock_page_hook(struct page *page) 21894bef0848SChris Mason { 21904bef0848SChris Mason struct inode *inode = page->mapping->host; 21914bef0848SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 21924bef0848SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 21934bef0848SChris Mason struct extent_buffer *eb; 21944bef0848SChris Mason unsigned long len; 21954bef0848SChris Mason u64 bytenr = page_offset(page); 21964bef0848SChris Mason 21974bef0848SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 21984bef0848SChris Mason goto out; 21994bef0848SChris Mason 22004bef0848SChris Mason len = page->private >> 2; 22014bef0848SChris Mason eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); 22024bef0848SChris Mason if (!eb) 22034bef0848SChris Mason goto out; 22044bef0848SChris Mason 22054bef0848SChris Mason btrfs_tree_lock(eb); 22064bef0848SChris Mason spin_lock(&root->fs_info->hash_lock); 22074bef0848SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 22084bef0848SChris Mason spin_unlock(&root->fs_info->hash_lock); 22094bef0848SChris Mason btrfs_tree_unlock(eb); 22104bef0848SChris Mason free_extent_buffer(eb); 22114bef0848SChris Mason out: 22124bef0848SChris Mason lock_page(page); 22134bef0848SChris Mason return 0; 22144bef0848SChris Mason } 22154bef0848SChris Mason 2216d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 22174bef0848SChris Mason .write_cache_pages_lock_hook = btree_lock_page_hook, 2218ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 22190b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 2220239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 2221239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 22220da5468fSChris Mason }; 2223