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; 8410f7d52f4SChris Mason root->inode = NULL; 842a28ec197SChris Mason root->commit_root = NULL; 84331153d81SYan Zheng root->ref_tree = NULL; 844db94535dSChris Mason root->sectorsize = sectorsize; 845db94535dSChris Mason root->nodesize = nodesize; 846db94535dSChris Mason root->leafsize = leafsize; 84787ee04ebSChris Mason root->stripesize = stripesize; 848123abc88SChris Mason root->ref_cows = 0; 8490b86a832SChris Mason root->track_dirty = 0; 8500b86a832SChris Mason 8519f5fae2fSChris Mason root->fs_info = fs_info; 8520f7d52f4SChris Mason root->objectid = objectid; 8530f7d52f4SChris Mason root->last_trans = 0; 8541b05da2eSChris Mason root->highest_inode = 0; 8551b05da2eSChris Mason root->last_inode_alloc = 0; 85658176a96SJosef Bacik root->name = NULL; 8574313b399SChris Mason root->in_sysfs = 0; 8580b86a832SChris Mason 8590b86a832SChris Mason INIT_LIST_HEAD(&root->dirty_list); 8607b128766SJosef Bacik INIT_LIST_HEAD(&root->orphan_list); 861bcc63abbSYan INIT_LIST_HEAD(&root->dead_list); 862925baeddSChris Mason spin_lock_init(&root->node_lock); 863bcc63abbSYan spin_lock_init(&root->list_lock); 864a2135011SChris Mason mutex_init(&root->objectid_mutex); 865e02119d5SChris Mason mutex_init(&root->log_mutex); 866d0c803c4SChris Mason extent_io_tree_init(&root->dirty_log_pages, 867d0c803c4SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 868017e5369SChris Mason 869017e5369SChris Mason btrfs_leaf_ref_tree_init(&root->ref_tree_struct); 870017e5369SChris Mason root->ref_tree = &root->ref_tree_struct; 871017e5369SChris Mason 8723768f368SChris Mason memset(&root->root_key, 0, sizeof(root->root_key)); 8733768f368SChris Mason memset(&root->root_item, 0, sizeof(root->root_item)); 8746702ed49SChris Mason memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); 87558176a96SJosef Bacik memset(&root->root_kobj, 0, sizeof(root->root_kobj)); 8763f157a2fSChris Mason root->defrag_trans_start = fs_info->generation; 87758176a96SJosef Bacik init_completion(&root->kobj_unregister); 8786702ed49SChris Mason root->defrag_running = 0; 8796702ed49SChris Mason root->defrag_level = 0; 8804d775673SChris Mason root->root_key.objectid = objectid; 8813768f368SChris Mason return 0; 8823768f368SChris Mason } 8833768f368SChris Mason 884db94535dSChris Mason static int find_and_setup_root(struct btrfs_root *tree_root, 8859f5fae2fSChris Mason struct btrfs_fs_info *fs_info, 8869f5fae2fSChris Mason u64 objectid, 887e20d96d6SChris Mason struct btrfs_root *root) 8883768f368SChris Mason { 8893768f368SChris Mason int ret; 890db94535dSChris Mason u32 blocksize; 89184234f3aSYan Zheng u64 generation; 8923768f368SChris Mason 893db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 89487ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 89587ee04ebSChris Mason root, fs_info, objectid); 8963768f368SChris Mason ret = btrfs_find_last_root(tree_root, objectid, 8973768f368SChris Mason &root->root_item, &root->root_key); 8983768f368SChris Mason BUG_ON(ret); 8993768f368SChris Mason 90084234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 901db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 902db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 90384234f3aSYan Zheng blocksize, generation); 9043768f368SChris Mason BUG_ON(!root->node); 905d97e63b6SChris Mason return 0; 906d97e63b6SChris Mason } 907d97e63b6SChris Mason 908e02119d5SChris Mason int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, 909e02119d5SChris Mason struct btrfs_fs_info *fs_info) 910e02119d5SChris Mason { 911e02119d5SChris Mason struct extent_buffer *eb; 912d0c803c4SChris Mason struct btrfs_root *log_root_tree = fs_info->log_root_tree; 913d0c803c4SChris Mason u64 start = 0; 914d0c803c4SChris Mason u64 end = 0; 915e02119d5SChris Mason int ret; 916e02119d5SChris Mason 917d0c803c4SChris Mason if (!log_root_tree) 918e02119d5SChris Mason return 0; 919e02119d5SChris Mason 920d0c803c4SChris Mason while(1) { 921d0c803c4SChris Mason ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, 922d0c803c4SChris Mason 0, &start, &end, EXTENT_DIRTY); 923d0c803c4SChris Mason if (ret) 924d0c803c4SChris Mason break; 925d0c803c4SChris Mason 926d0c803c4SChris Mason clear_extent_dirty(&log_root_tree->dirty_log_pages, 927d0c803c4SChris Mason start, end, GFP_NOFS); 928d0c803c4SChris Mason } 929e02119d5SChris Mason eb = fs_info->log_root_tree->node; 930e02119d5SChris Mason 931e02119d5SChris Mason WARN_ON(btrfs_header_level(eb) != 0); 932e02119d5SChris Mason WARN_ON(btrfs_header_nritems(eb) != 0); 933e02119d5SChris Mason 934d00aff00SChris Mason ret = btrfs_free_reserved_extent(fs_info->tree_root, 935d00aff00SChris Mason eb->start, eb->len); 936e02119d5SChris Mason BUG_ON(ret); 937e02119d5SChris Mason 938e02119d5SChris Mason free_extent_buffer(eb); 939e02119d5SChris Mason kfree(fs_info->log_root_tree); 940e02119d5SChris Mason fs_info->log_root_tree = NULL; 941e02119d5SChris Mason return 0; 942e02119d5SChris Mason } 943e02119d5SChris Mason 944e02119d5SChris Mason int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, 945e02119d5SChris Mason struct btrfs_fs_info *fs_info) 9460f7d52f4SChris Mason { 9470f7d52f4SChris Mason struct btrfs_root *root; 9480f7d52f4SChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 949e02119d5SChris Mason 950e02119d5SChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 951e02119d5SChris Mason if (!root) 952e02119d5SChris Mason return -ENOMEM; 953e02119d5SChris Mason 954e02119d5SChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 955e02119d5SChris Mason tree_root->sectorsize, tree_root->stripesize, 956e02119d5SChris Mason root, fs_info, BTRFS_TREE_LOG_OBJECTID); 957e02119d5SChris Mason 958e02119d5SChris Mason root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; 959e02119d5SChris Mason root->root_key.type = BTRFS_ROOT_ITEM_KEY; 960e02119d5SChris Mason root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; 961e02119d5SChris Mason root->ref_cows = 0; 962e02119d5SChris Mason 963e02119d5SChris Mason root->node = btrfs_alloc_free_block(trans, root, root->leafsize, 96431840ae1SZheng Yan 0, BTRFS_TREE_LOG_OBJECTID, 96531840ae1SZheng Yan trans->transid, 0, 0, 0); 966e02119d5SChris Mason 967e02119d5SChris Mason btrfs_set_header_nritems(root->node, 0); 968e02119d5SChris Mason btrfs_set_header_level(root->node, 0); 969e02119d5SChris Mason btrfs_set_header_bytenr(root->node, root->node->start); 970e02119d5SChris Mason btrfs_set_header_generation(root->node, trans->transid); 971e02119d5SChris Mason btrfs_set_header_owner(root->node, BTRFS_TREE_LOG_OBJECTID); 972e02119d5SChris Mason 973e02119d5SChris Mason write_extent_buffer(root->node, root->fs_info->fsid, 974e02119d5SChris Mason (unsigned long)btrfs_header_fsid(root->node), 975e02119d5SChris Mason BTRFS_FSID_SIZE); 976e02119d5SChris Mason btrfs_mark_buffer_dirty(root->node); 977e02119d5SChris Mason btrfs_tree_unlock(root->node); 978e02119d5SChris Mason fs_info->log_root_tree = root; 979e02119d5SChris Mason return 0; 980e02119d5SChris Mason } 981e02119d5SChris Mason 982e02119d5SChris Mason struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, 983e02119d5SChris Mason struct btrfs_key *location) 984e02119d5SChris Mason { 985e02119d5SChris Mason struct btrfs_root *root; 986e02119d5SChris Mason struct btrfs_fs_info *fs_info = tree_root->fs_info; 9870f7d52f4SChris Mason struct btrfs_path *path; 9885f39d397SChris Mason struct extent_buffer *l; 9891b05da2eSChris Mason u64 highest_inode; 99084234f3aSYan Zheng u64 generation; 991db94535dSChris Mason u32 blocksize; 9920f7d52f4SChris Mason int ret = 0; 9930f7d52f4SChris Mason 9945eda7b5eSChris Mason root = kzalloc(sizeof(*root), GFP_NOFS); 9950cf6c620SChris Mason if (!root) 9960f7d52f4SChris Mason return ERR_PTR(-ENOMEM); 9970f7d52f4SChris Mason if (location->offset == (u64)-1) { 998db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 9990f7d52f4SChris Mason location->objectid, root); 10000f7d52f4SChris Mason if (ret) { 10010f7d52f4SChris Mason kfree(root); 10020f7d52f4SChris Mason return ERR_PTR(ret); 10030f7d52f4SChris Mason } 10040f7d52f4SChris Mason goto insert; 10050f7d52f4SChris Mason } 10060f7d52f4SChris Mason 1007db94535dSChris Mason __setup_root(tree_root->nodesize, tree_root->leafsize, 100887ee04ebSChris Mason tree_root->sectorsize, tree_root->stripesize, 100987ee04ebSChris Mason root, fs_info, location->objectid); 10100f7d52f4SChris Mason 10110f7d52f4SChris Mason path = btrfs_alloc_path(); 10120f7d52f4SChris Mason BUG_ON(!path); 10130f7d52f4SChris Mason ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); 10140f7d52f4SChris Mason if (ret != 0) { 10150f7d52f4SChris Mason if (ret > 0) 10160f7d52f4SChris Mason ret = -ENOENT; 10170f7d52f4SChris Mason goto out; 10180f7d52f4SChris Mason } 10195f39d397SChris Mason l = path->nodes[0]; 10205f39d397SChris Mason read_extent_buffer(l, &root->root_item, 10215f39d397SChris Mason btrfs_item_ptr_offset(l, path->slots[0]), 10220f7d52f4SChris Mason sizeof(root->root_item)); 102344b36eb2SYan Zheng memcpy(&root->root_key, location, sizeof(*location)); 10240f7d52f4SChris Mason ret = 0; 10250f7d52f4SChris Mason out: 10260f7d52f4SChris Mason btrfs_release_path(root, path); 10270f7d52f4SChris Mason btrfs_free_path(path); 10280f7d52f4SChris Mason if (ret) { 10290f7d52f4SChris Mason kfree(root); 10300f7d52f4SChris Mason return ERR_PTR(ret); 10310f7d52f4SChris Mason } 103284234f3aSYan Zheng generation = btrfs_root_generation(&root->root_item); 1033db94535dSChris Mason blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); 1034db94535dSChris Mason root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), 103584234f3aSYan Zheng blocksize, generation); 10360f7d52f4SChris Mason BUG_ON(!root->node); 10370f7d52f4SChris Mason insert: 1038e02119d5SChris Mason if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { 10390f7d52f4SChris Mason root->ref_cows = 1; 10405eda7b5eSChris Mason ret = btrfs_find_highest_inode(root, &highest_inode); 10415eda7b5eSChris Mason if (ret == 0) { 10425eda7b5eSChris Mason root->highest_inode = highest_inode; 10435eda7b5eSChris Mason root->last_inode_alloc = highest_inode; 10445eda7b5eSChris Mason } 1045e02119d5SChris Mason } 10465eda7b5eSChris Mason return root; 10475eda7b5eSChris Mason } 10485eda7b5eSChris Mason 1049dc17ff8fSChris Mason struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, 1050dc17ff8fSChris Mason u64 root_objectid) 1051dc17ff8fSChris Mason { 1052dc17ff8fSChris Mason struct btrfs_root *root; 1053dc17ff8fSChris Mason 1054dc17ff8fSChris Mason if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) 1055dc17ff8fSChris Mason return fs_info->tree_root; 1056dc17ff8fSChris Mason if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) 1057dc17ff8fSChris Mason return fs_info->extent_root; 1058dc17ff8fSChris Mason 1059dc17ff8fSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 1060dc17ff8fSChris Mason (unsigned long)root_objectid); 1061dc17ff8fSChris Mason return root; 1062dc17ff8fSChris Mason } 1063dc17ff8fSChris Mason 1064edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 1065edbd8d4eSChris Mason struct btrfs_key *location) 10665eda7b5eSChris Mason { 10675eda7b5eSChris Mason struct btrfs_root *root; 10685eda7b5eSChris Mason int ret; 10695eda7b5eSChris Mason 1070edbd8d4eSChris Mason if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) 1071edbd8d4eSChris Mason return fs_info->tree_root; 1072edbd8d4eSChris Mason if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) 1073edbd8d4eSChris Mason return fs_info->extent_root; 10748f18cf13SChris Mason if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) 10758f18cf13SChris Mason return fs_info->chunk_root; 10768f18cf13SChris Mason if (location->objectid == BTRFS_DEV_TREE_OBJECTID) 10778f18cf13SChris Mason return fs_info->dev_root; 1078edbd8d4eSChris Mason 10795eda7b5eSChris Mason root = radix_tree_lookup(&fs_info->fs_roots_radix, 10805eda7b5eSChris Mason (unsigned long)location->objectid); 10815eda7b5eSChris Mason if (root) 10825eda7b5eSChris Mason return root; 10835eda7b5eSChris Mason 1084e02119d5SChris Mason root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); 10855eda7b5eSChris Mason if (IS_ERR(root)) 10865eda7b5eSChris Mason return root; 10872619ba1fSChris Mason ret = radix_tree_insert(&fs_info->fs_roots_radix, 10882619ba1fSChris Mason (unsigned long)root->root_key.objectid, 10890f7d52f4SChris Mason root); 10900f7d52f4SChris Mason if (ret) { 10915f39d397SChris Mason free_extent_buffer(root->node); 10920f7d52f4SChris Mason kfree(root); 10930f7d52f4SChris Mason return ERR_PTR(ret); 10940f7d52f4SChris Mason } 1095c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 1096edbd8d4eSChris Mason ret = btrfs_find_dead_roots(fs_info->tree_root, 1097edbd8d4eSChris Mason root->root_key.objectid, root); 1098edbd8d4eSChris Mason BUG_ON(ret); 1099c146afadSYan Zheng btrfs_orphan_cleanup(root); 1100c146afadSYan Zheng } 1101edbd8d4eSChris Mason return root; 1102edbd8d4eSChris Mason } 1103edbd8d4eSChris Mason 1104edbd8d4eSChris Mason struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, 1105edbd8d4eSChris Mason struct btrfs_key *location, 1106edbd8d4eSChris Mason const char *name, int namelen) 1107edbd8d4eSChris Mason { 1108edbd8d4eSChris Mason struct btrfs_root *root; 1109edbd8d4eSChris Mason int ret; 1110edbd8d4eSChris Mason 1111edbd8d4eSChris Mason root = btrfs_read_fs_root_no_name(fs_info, location); 1112edbd8d4eSChris Mason if (!root) 1113edbd8d4eSChris Mason return NULL; 111458176a96SJosef Bacik 11154313b399SChris Mason if (root->in_sysfs) 11164313b399SChris Mason return root; 11174313b399SChris Mason 111858176a96SJosef Bacik ret = btrfs_set_root_name(root, name, namelen); 111958176a96SJosef Bacik if (ret) { 11205f39d397SChris Mason free_extent_buffer(root->node); 112158176a96SJosef Bacik kfree(root); 112258176a96SJosef Bacik return ERR_PTR(ret); 112358176a96SJosef Bacik } 112458176a96SJosef Bacik 112558176a96SJosef Bacik ret = btrfs_sysfs_add_root(root); 112658176a96SJosef Bacik if (ret) { 11275f39d397SChris Mason free_extent_buffer(root->node); 112858176a96SJosef Bacik kfree(root->name); 112958176a96SJosef Bacik kfree(root); 113058176a96SJosef Bacik return ERR_PTR(ret); 113158176a96SJosef Bacik } 11324313b399SChris Mason root->in_sysfs = 1; 11330f7d52f4SChris Mason return root; 11340f7d52f4SChris Mason } 113519c00ddcSChris Mason #if 0 113619c00ddcSChris Mason static int add_hasher(struct btrfs_fs_info *info, char *type) { 113719c00ddcSChris Mason struct btrfs_hasher *hasher; 11380f7d52f4SChris Mason 113919c00ddcSChris Mason hasher = kmalloc(sizeof(*hasher), GFP_NOFS); 114019c00ddcSChris Mason if (!hasher) 114119c00ddcSChris Mason return -ENOMEM; 114219c00ddcSChris Mason hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC); 114319c00ddcSChris Mason if (!hasher->hash_tfm) { 114419c00ddcSChris Mason kfree(hasher); 114519c00ddcSChris Mason return -EINVAL; 114619c00ddcSChris Mason } 114719c00ddcSChris Mason spin_lock(&info->hash_lock); 114819c00ddcSChris Mason list_add(&hasher->list, &info->hashers); 114919c00ddcSChris Mason spin_unlock(&info->hash_lock); 115019c00ddcSChris Mason return 0; 115119c00ddcSChris Mason } 115219c00ddcSChris Mason #endif 115304160088SChris Mason 115404160088SChris Mason static int btrfs_congested_fn(void *congested_data, int bdi_bits) 115504160088SChris Mason { 115604160088SChris Mason struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; 115704160088SChris Mason int ret = 0; 115804160088SChris Mason struct list_head *cur; 115904160088SChris Mason struct btrfs_device *device; 116004160088SChris Mason struct backing_dev_info *bdi; 11616f3577bdSChris Mason #if 0 1162cb03c743SChris Mason if ((bdi_bits & (1 << BDI_write_congested)) && 1163777e6bd7SChris Mason btrfs_congested_async(info, 0)) 1164cb03c743SChris Mason return 1; 11656f3577bdSChris Mason #endif 116604160088SChris Mason list_for_each(cur, &info->fs_devices->devices) { 116704160088SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 1168dfe25020SChris Mason if (!device->bdev) 1169dfe25020SChris Mason continue; 117004160088SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 117104160088SChris Mason if (bdi && bdi_congested(bdi, bdi_bits)) { 117204160088SChris Mason ret = 1; 117304160088SChris Mason break; 117404160088SChris Mason } 117504160088SChris Mason } 117604160088SChris Mason return ret; 117704160088SChris Mason } 117804160088SChris Mason 117938b66988SChris Mason /* 118038b66988SChris Mason * this unplugs every device on the box, and it is only used when page 118138b66988SChris Mason * is null 118238b66988SChris Mason */ 118338b66988SChris Mason static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 118438b66988SChris Mason { 118538b66988SChris Mason struct list_head *cur; 118638b66988SChris Mason struct btrfs_device *device; 118738b66988SChris Mason struct btrfs_fs_info *info; 118838b66988SChris Mason 118938b66988SChris Mason info = (struct btrfs_fs_info *)bdi->unplug_io_data; 119038b66988SChris Mason list_for_each(cur, &info->fs_devices->devices) { 119138b66988SChris Mason device = list_entry(cur, struct btrfs_device, dev_list); 119238b66988SChris Mason bdi = blk_get_backing_dev_info(device->bdev); 119338b66988SChris Mason if (bdi->unplug_io_fn) { 119438b66988SChris Mason bdi->unplug_io_fn(bdi, page); 119538b66988SChris Mason } 119638b66988SChris Mason } 119738b66988SChris Mason } 119838b66988SChris Mason 119904160088SChris Mason void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 120004160088SChris Mason { 120138b66988SChris Mason struct inode *inode; 1202f2d8d74dSChris Mason struct extent_map_tree *em_tree; 1203f2d8d74dSChris Mason struct extent_map *em; 1204bcbfce8aSChris Mason struct address_space *mapping; 120538b66988SChris Mason u64 offset; 120638b66988SChris Mason 1207bcbfce8aSChris Mason /* the generic O_DIRECT read code does this */ 120838b66988SChris Mason if (!page) { 120938b66988SChris Mason __unplug_io_fn(bdi, page); 121038b66988SChris Mason return; 121138b66988SChris Mason } 121238b66988SChris Mason 1213bcbfce8aSChris Mason /* 1214bcbfce8aSChris Mason * page->mapping may change at any time. Get a consistent copy 1215bcbfce8aSChris Mason * and use that for everything below 1216bcbfce8aSChris Mason */ 1217bcbfce8aSChris Mason smp_mb(); 1218bcbfce8aSChris Mason mapping = page->mapping; 1219bcbfce8aSChris Mason if (!mapping) 1220bcbfce8aSChris Mason return; 1221bcbfce8aSChris Mason 1222bcbfce8aSChris Mason inode = mapping->host; 1223240d5d48SChris Mason 1224240d5d48SChris Mason /* 1225240d5d48SChris Mason * don't do the expensive searching for a small number of 1226240d5d48SChris Mason * devices 1227240d5d48SChris Mason */ 1228240d5d48SChris Mason if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { 1229240d5d48SChris Mason __unplug_io_fn(bdi, page); 1230240d5d48SChris Mason return; 1231240d5d48SChris Mason } 1232240d5d48SChris Mason 123338b66988SChris Mason offset = page_offset(page); 123404160088SChris Mason 1235f2d8d74dSChris Mason em_tree = &BTRFS_I(inode)->extent_tree; 1236f2d8d74dSChris Mason spin_lock(&em_tree->lock); 1237f2d8d74dSChris Mason em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); 1238f2d8d74dSChris Mason spin_unlock(&em_tree->lock); 123989642229SChris Mason if (!em) { 124089642229SChris Mason __unplug_io_fn(bdi, page); 1241f2d8d74dSChris Mason return; 124289642229SChris Mason } 1243f2d8d74dSChris Mason 124489642229SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 124589642229SChris Mason free_extent_map(em); 124689642229SChris Mason __unplug_io_fn(bdi, page); 124789642229SChris Mason return; 124889642229SChris Mason } 1249f2d8d74dSChris Mason offset = offset - em->start; 1250f2d8d74dSChris Mason btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, 1251f2d8d74dSChris Mason em->block_start + offset, page); 1252f2d8d74dSChris Mason free_extent_map(em); 125304160088SChris Mason } 125404160088SChris Mason 125504160088SChris Mason static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) 125604160088SChris Mason { 125704160088SChris Mason bdi_init(bdi); 12584575c9ccSChris Mason bdi->ra_pages = default_backing_dev_info.ra_pages; 125904160088SChris Mason bdi->state = 0; 126004160088SChris Mason bdi->capabilities = default_backing_dev_info.capabilities; 126104160088SChris Mason bdi->unplug_io_fn = btrfs_unplug_io_fn; 126204160088SChris Mason bdi->unplug_io_data = info; 126304160088SChris Mason bdi->congested_fn = btrfs_congested_fn; 126404160088SChris Mason bdi->congested_data = info; 126504160088SChris Mason return 0; 126604160088SChris Mason } 126704160088SChris Mason 1268ce9adaa5SChris Mason static int bio_ready_for_csum(struct bio *bio) 1269ce9adaa5SChris Mason { 1270ce9adaa5SChris Mason u64 length = 0; 1271ce9adaa5SChris Mason u64 buf_len = 0; 1272ce9adaa5SChris Mason u64 start = 0; 1273ce9adaa5SChris Mason struct page *page; 1274ce9adaa5SChris Mason struct extent_io_tree *io_tree = NULL; 1275ce9adaa5SChris Mason struct btrfs_fs_info *info = NULL; 1276ce9adaa5SChris Mason struct bio_vec *bvec; 1277ce9adaa5SChris Mason int i; 1278ce9adaa5SChris Mason int ret; 1279ce9adaa5SChris Mason 1280ce9adaa5SChris Mason bio_for_each_segment(bvec, bio, i) { 1281ce9adaa5SChris Mason page = bvec->bv_page; 1282ce9adaa5SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) { 1283ce9adaa5SChris Mason length += bvec->bv_len; 1284ce9adaa5SChris Mason continue; 1285ce9adaa5SChris Mason } 1286ce9adaa5SChris Mason if (!page->private) { 1287ce9adaa5SChris Mason length += bvec->bv_len; 1288ce9adaa5SChris Mason continue; 1289ce9adaa5SChris Mason } 1290ce9adaa5SChris Mason length = bvec->bv_len; 1291ce9adaa5SChris Mason buf_len = page->private >> 2; 1292ce9adaa5SChris Mason start = page_offset(page) + bvec->bv_offset; 1293ce9adaa5SChris Mason io_tree = &BTRFS_I(page->mapping->host)->io_tree; 1294ce9adaa5SChris Mason info = BTRFS_I(page->mapping->host)->root->fs_info; 1295ce9adaa5SChris Mason } 1296ce9adaa5SChris Mason /* are we fully contained in this bio? */ 1297ce9adaa5SChris Mason if (buf_len <= length) 1298ce9adaa5SChris Mason return 1; 1299ce9adaa5SChris Mason 1300ce9adaa5SChris Mason ret = extent_range_uptodate(io_tree, start + length, 1301ce9adaa5SChris Mason start + buf_len - 1); 1302ce9adaa5SChris Mason if (ret == 1) 1303ce9adaa5SChris Mason return ret; 1304ce9adaa5SChris Mason return ret; 1305ce9adaa5SChris Mason } 1306ce9adaa5SChris Mason 13078b712842SChris Mason /* 13088b712842SChris Mason * called by the kthread helper functions to finally call the bio end_io 13098b712842SChris Mason * functions. This is where read checksum verification actually happens 13108b712842SChris Mason */ 13118b712842SChris Mason static void end_workqueue_fn(struct btrfs_work *work) 1312ce9adaa5SChris Mason { 1313ce9adaa5SChris Mason struct bio *bio; 13148b712842SChris Mason struct end_io_wq *end_io_wq; 13158b712842SChris Mason struct btrfs_fs_info *fs_info; 1316ce9adaa5SChris Mason int error; 1317ce9adaa5SChris Mason 13188b712842SChris Mason end_io_wq = container_of(work, struct end_io_wq, work); 1319ce9adaa5SChris Mason bio = end_io_wq->bio; 13208b712842SChris Mason fs_info = end_io_wq->info; 13218b712842SChris Mason 13228b712842SChris Mason /* metadata bios are special because the whole tree block must 13238b712842SChris Mason * be checksummed at once. This makes sure the entire block is in 13248b712842SChris Mason * ram and up to date before trying to verify things. For 13258b712842SChris Mason * blocksize <= pagesize, it is basically a noop 13268b712842SChris Mason */ 132722c59948SChris Mason if (end_io_wq->metadata && !bio_ready_for_csum(bio)) { 13288b712842SChris Mason btrfs_queue_worker(&fs_info->endio_workers, 13298b712842SChris Mason &end_io_wq->work); 1330ce9adaa5SChris Mason return; 1331ce9adaa5SChris Mason } 1332ce9adaa5SChris Mason error = end_io_wq->error; 1333ce9adaa5SChris Mason bio->bi_private = end_io_wq->private; 1334ce9adaa5SChris Mason bio->bi_end_io = end_io_wq->end_io; 1335ce9adaa5SChris Mason kfree(end_io_wq); 1336ce9adaa5SChris Mason bio_endio(bio, error); 1337ce9adaa5SChris Mason } 133844b8bd7eSChris Mason 1339a74a4b97SChris Mason static int cleaner_kthread(void *arg) 1340a74a4b97SChris Mason { 1341a74a4b97SChris Mason struct btrfs_root *root = arg; 1342a74a4b97SChris Mason 1343a74a4b97SChris Mason do { 1344a74a4b97SChris Mason smp_mb(); 1345a74a4b97SChris Mason if (root->fs_info->closing) 1346a74a4b97SChris Mason break; 1347a74a4b97SChris Mason 1348a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1349a74a4b97SChris Mason mutex_lock(&root->fs_info->cleaner_mutex); 1350a74a4b97SChris Mason btrfs_clean_old_snapshots(root); 1351a74a4b97SChris Mason mutex_unlock(&root->fs_info->cleaner_mutex); 1352a74a4b97SChris Mason 1353a74a4b97SChris Mason if (freezing(current)) { 1354a74a4b97SChris Mason refrigerator(); 1355a74a4b97SChris Mason } else { 1356a74a4b97SChris Mason smp_mb(); 1357a74a4b97SChris Mason if (root->fs_info->closing) 1358a74a4b97SChris Mason break; 1359a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 1360a74a4b97SChris Mason schedule(); 1361a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1362a74a4b97SChris Mason } 1363a74a4b97SChris Mason } while (!kthread_should_stop()); 1364a74a4b97SChris Mason return 0; 1365a74a4b97SChris Mason } 1366a74a4b97SChris Mason 1367a74a4b97SChris Mason static int transaction_kthread(void *arg) 1368a74a4b97SChris Mason { 1369a74a4b97SChris Mason struct btrfs_root *root = arg; 1370a74a4b97SChris Mason struct btrfs_trans_handle *trans; 1371a74a4b97SChris Mason struct btrfs_transaction *cur; 1372a74a4b97SChris Mason unsigned long now; 1373a74a4b97SChris Mason unsigned long delay; 1374a74a4b97SChris Mason int ret; 1375a74a4b97SChris Mason 1376a74a4b97SChris Mason do { 1377a74a4b97SChris Mason smp_mb(); 1378a74a4b97SChris Mason if (root->fs_info->closing) 1379a74a4b97SChris Mason break; 1380a74a4b97SChris Mason 1381a74a4b97SChris Mason delay = HZ * 30; 1382a74a4b97SChris Mason vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); 1383a74a4b97SChris Mason mutex_lock(&root->fs_info->transaction_kthread_mutex); 1384a74a4b97SChris Mason 1385ab78c84dSChris Mason if (root->fs_info->total_ref_cache_size > 20 * 1024 * 1024) { 138631153d81SYan Zheng printk("btrfs: total reference cache size %Lu\n", 138731153d81SYan Zheng root->fs_info->total_ref_cache_size); 1388ab78c84dSChris Mason } 138931153d81SYan Zheng 1390a74a4b97SChris Mason mutex_lock(&root->fs_info->trans_mutex); 1391a74a4b97SChris Mason cur = root->fs_info->running_transaction; 1392a74a4b97SChris Mason if (!cur) { 1393a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1394a74a4b97SChris Mason goto sleep; 1395a74a4b97SChris Mason } 139631153d81SYan Zheng 1397a74a4b97SChris Mason now = get_seconds(); 1398a74a4b97SChris Mason if (now < cur->start_time || now - cur->start_time < 30) { 1399a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1400a74a4b97SChris Mason delay = HZ * 5; 1401a74a4b97SChris Mason goto sleep; 1402a74a4b97SChris Mason } 1403a74a4b97SChris Mason mutex_unlock(&root->fs_info->trans_mutex); 1404a74a4b97SChris Mason trans = btrfs_start_transaction(root, 1); 1405a74a4b97SChris Mason ret = btrfs_commit_transaction(trans, root); 1406a74a4b97SChris Mason sleep: 1407a74a4b97SChris Mason wake_up_process(root->fs_info->cleaner_kthread); 1408a74a4b97SChris Mason mutex_unlock(&root->fs_info->transaction_kthread_mutex); 1409a74a4b97SChris Mason 1410a74a4b97SChris Mason if (freezing(current)) { 1411a74a4b97SChris Mason refrigerator(); 1412a74a4b97SChris Mason } else { 1413a74a4b97SChris Mason if (root->fs_info->closing) 1414a74a4b97SChris Mason break; 1415a74a4b97SChris Mason set_current_state(TASK_INTERRUPTIBLE); 1416a74a4b97SChris Mason schedule_timeout(delay); 1417a74a4b97SChris Mason __set_current_state(TASK_RUNNING); 1418a74a4b97SChris Mason } 1419a74a4b97SChris Mason } while (!kthread_should_stop()); 1420a74a4b97SChris Mason return 0; 1421a74a4b97SChris Mason } 1422a74a4b97SChris Mason 14238a4b83ccSChris Mason struct btrfs_root *open_ctree(struct super_block *sb, 1424dfe25020SChris Mason struct btrfs_fs_devices *fs_devices, 1425dfe25020SChris Mason char *options) 1426eb60ceacSChris Mason { 1427db94535dSChris Mason u32 sectorsize; 1428db94535dSChris Mason u32 nodesize; 1429db94535dSChris Mason u32 leafsize; 1430db94535dSChris Mason u32 blocksize; 143187ee04ebSChris Mason u32 stripesize; 143284234f3aSYan Zheng u64 generation; 1433a061fc8dSChris Mason struct buffer_head *bh; 1434e02119d5SChris Mason struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), 1435e20d96d6SChris Mason GFP_NOFS); 1436e02119d5SChris Mason struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root), 1437e20d96d6SChris Mason GFP_NOFS); 14388790d502SChris Mason struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), 1439e20d96d6SChris Mason GFP_NOFS); 1440e02119d5SChris Mason struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), 14410b86a832SChris Mason GFP_NOFS); 1442e02119d5SChris Mason struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), 14430b86a832SChris Mason GFP_NOFS); 1444e02119d5SChris Mason struct btrfs_root *log_tree_root; 1445e02119d5SChris Mason 1446eb60ceacSChris Mason int ret; 1447e58ca020SYan int err = -EINVAL; 14484543df7eSChris Mason 14492c90e5d6SChris Mason struct btrfs_super_block *disk_super; 14508790d502SChris Mason 14510463bb4eSJim Meyering if (!extent_root || !tree_root || !fs_info || 14520463bb4eSJim Meyering !chunk_root || !dev_root) { 145339279cc3SChris Mason err = -ENOMEM; 145439279cc3SChris Mason goto fail; 145539279cc3SChris Mason } 14560f7d52f4SChris Mason INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); 14578fd17795SChris Mason INIT_LIST_HEAD(&fs_info->trans_list); 1458facda1e7SChris Mason INIT_LIST_HEAD(&fs_info->dead_roots); 145919c00ddcSChris Mason INIT_LIST_HEAD(&fs_info->hashers); 1460ea8c2819SChris Mason INIT_LIST_HEAD(&fs_info->delalloc_inodes); 146119c00ddcSChris Mason spin_lock_init(&fs_info->hash_lock); 14621832a6d5SChris Mason spin_lock_init(&fs_info->delalloc_lock); 1463cee36a03SChris Mason spin_lock_init(&fs_info->new_trans_lock); 146431153d81SYan Zheng spin_lock_init(&fs_info->ref_cache_lock); 146519c00ddcSChris Mason 146658176a96SJosef Bacik init_completion(&fs_info->kobj_unregister); 14679f5fae2fSChris Mason fs_info->tree_root = tree_root; 14689f5fae2fSChris Mason fs_info->extent_root = extent_root; 14690b86a832SChris Mason fs_info->chunk_root = chunk_root; 14700b86a832SChris Mason fs_info->dev_root = dev_root; 14718a4b83ccSChris Mason fs_info->fs_devices = fs_devices; 14720b86a832SChris Mason INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); 14736324fbf3SChris Mason INIT_LIST_HEAD(&fs_info->space_info); 14740b86a832SChris Mason btrfs_mapping_init(&fs_info->mapping_tree); 1475cb03c743SChris Mason atomic_set(&fs_info->nr_async_submits, 0); 1476771ed689SChris Mason atomic_set(&fs_info->async_delalloc_pages, 0); 14778c8bee1dSChris Mason atomic_set(&fs_info->async_submit_draining, 0); 14780986fe9eSChris Mason atomic_set(&fs_info->nr_async_bios, 0); 1479a2135011SChris Mason atomic_set(&fs_info->throttles, 0); 1480ab78c84dSChris Mason atomic_set(&fs_info->throttle_gen, 0); 1481e20d96d6SChris Mason fs_info->sb = sb; 1482c59f8951SChris Mason fs_info->max_extent = (u64)-1; 14836f568d35SChris Mason fs_info->max_inline = 8192 * 1024; 148404160088SChris Mason setup_bdi(fs_info, &fs_info->bdi); 1485d98237b3SChris Mason fs_info->btree_inode = new_inode(sb); 1486d98237b3SChris Mason fs_info->btree_inode->i_ino = 1; 14872c90e5d6SChris Mason fs_info->btree_inode->i_nlink = 1; 1488c8b97818SChris Mason 14894543df7eSChris Mason fs_info->thread_pool_size = min(num_online_cpus() + 2, 8); 14900afbaf8cSChris Mason 14913eaa2885SChris Mason INIT_LIST_HEAD(&fs_info->ordered_extents); 14923eaa2885SChris Mason spin_lock_init(&fs_info->ordered_extent_lock); 14933eaa2885SChris Mason 1494a061fc8dSChris Mason sb->s_blocksize = 4096; 1495a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(4096); 1496a061fc8dSChris Mason 14970afbaf8cSChris Mason /* 14980afbaf8cSChris Mason * we set the i_size on the btree inode to the max possible int. 14990afbaf8cSChris Mason * the real end of the address space is determined by all of 15000afbaf8cSChris Mason * the devices in the system 15010afbaf8cSChris Mason */ 15020afbaf8cSChris Mason fs_info->btree_inode->i_size = OFFSET_MAX; 1503d98237b3SChris Mason fs_info->btree_inode->i_mapping->a_ops = &btree_aops; 150404160088SChris Mason fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; 150504160088SChris Mason 1506d1310b2eSChris Mason extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, 15075f39d397SChris Mason fs_info->btree_inode->i_mapping, 15085f39d397SChris Mason GFP_NOFS); 1509d1310b2eSChris Mason extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, 1510d1310b2eSChris Mason GFP_NOFS); 15110da5468fSChris Mason 1512d1310b2eSChris Mason BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; 1513d1310b2eSChris Mason 15140f9dd46cSJosef Bacik spin_lock_init(&fs_info->block_group_cache_lock); 15150f9dd46cSJosef Bacik fs_info->block_group_cache_tree.rb_node = NULL; 15160f9dd46cSJosef Bacik 1517d1310b2eSChris Mason extent_io_tree_init(&fs_info->pinned_extents, 15181a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1519d1310b2eSChris Mason extent_io_tree_init(&fs_info->pending_del, 15201a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1521d1310b2eSChris Mason extent_io_tree_init(&fs_info->extent_ins, 15221a5bc167SChris Mason fs_info->btree_inode->i_mapping, GFP_NOFS); 1523e66f709bSChris Mason fs_info->do_barriers = 1; 1524e18e4809SChris Mason 15251a40e23bSZheng Yan INIT_LIST_HEAD(&fs_info->dead_reloc_roots); 15261a40e23bSZheng Yan btrfs_leaf_ref_tree_init(&fs_info->reloc_ref_tree); 1527e4657689SZheng Yan btrfs_leaf_ref_tree_init(&fs_info->shared_ref_tree); 1528e4657689SZheng Yan 15290f7d52f4SChris Mason BTRFS_I(fs_info->btree_inode)->root = tree_root; 15300f7d52f4SChris Mason memset(&BTRFS_I(fs_info->btree_inode)->location, 0, 15310f7d52f4SChris Mason sizeof(struct btrfs_key)); 153222b0ebdaSChris Mason insert_inode_hash(fs_info->btree_inode); 153339279cc3SChris Mason 153479154b1bSChris Mason mutex_init(&fs_info->trans_mutex); 1535e02119d5SChris Mason mutex_init(&fs_info->tree_log_mutex); 1536a2135011SChris Mason mutex_init(&fs_info->drop_mutex); 153725179201SJosef Bacik mutex_init(&fs_info->extent_ins_mutex); 153825179201SJosef Bacik mutex_init(&fs_info->pinned_mutex); 1539925baeddSChris Mason mutex_init(&fs_info->chunk_mutex); 1540a74a4b97SChris Mason mutex_init(&fs_info->transaction_kthread_mutex); 1541a74a4b97SChris Mason mutex_init(&fs_info->cleaner_mutex); 15427d9eb12cSChris Mason mutex_init(&fs_info->volume_mutex); 15431a40e23bSZheng Yan mutex_init(&fs_info->tree_reloc_mutex); 1544e6dcd2dcSChris Mason init_waitqueue_head(&fs_info->transaction_throttle); 1545f9295749SChris Mason init_waitqueue_head(&fs_info->transaction_wait); 15464854ddd0SChris Mason init_waitqueue_head(&fs_info->async_submit_wait); 1547e02119d5SChris Mason init_waitqueue_head(&fs_info->tree_log_wait); 1548e02119d5SChris Mason atomic_set(&fs_info->tree_log_commit, 0); 1549e02119d5SChris Mason atomic_set(&fs_info->tree_log_writers, 0); 1550e02119d5SChris Mason fs_info->tree_log_transid = 0; 15513768f368SChris Mason 155219c00ddcSChris Mason #if 0 155319c00ddcSChris Mason ret = add_hasher(fs_info, "crc32c"); 155419c00ddcSChris Mason if (ret) { 155519c00ddcSChris Mason printk("btrfs: failed hash setup, modprobe cryptomgr?\n"); 155619c00ddcSChris Mason err = -ENOMEM; 155719c00ddcSChris Mason goto fail_iput; 155819c00ddcSChris Mason } 155919c00ddcSChris Mason #endif 15600b86a832SChris Mason __setup_root(4096, 4096, 4096, 4096, tree_root, 15612c90e5d6SChris Mason fs_info, BTRFS_ROOT_TREE_OBJECTID); 15627eccb903SChris Mason 1563d98237b3SChris Mason 1564a061fc8dSChris Mason bh = __bread(fs_devices->latest_bdev, 1565a061fc8dSChris Mason BTRFS_SUPER_INFO_OFFSET / 4096, 4096); 1566a061fc8dSChris Mason if (!bh) 156739279cc3SChris Mason goto fail_iput; 156839279cc3SChris Mason 1569a061fc8dSChris Mason memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); 1570a061fc8dSChris Mason brelse(bh); 15715f39d397SChris Mason 1572a061fc8dSChris Mason memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); 15730b86a832SChris Mason 15745f39d397SChris Mason disk_super = &fs_info->super_copy; 15750f7d52f4SChris Mason if (!btrfs_super_root(disk_super)) 157639279cc3SChris Mason goto fail_sb_buffer; 15770f7d52f4SChris Mason 15782b82032cSYan Zheng ret = btrfs_parse_options(tree_root, options); 15792b82032cSYan Zheng if (ret) { 15802b82032cSYan Zheng err = ret; 1581edf24abeSChristoph Hellwig goto fail_sb_buffer; 15822b82032cSYan Zheng } 1583dfe25020SChris Mason 15844543df7eSChris Mason /* 15854543df7eSChris Mason * we need to start all the end_io workers up front because the 15864543df7eSChris Mason * queue work function gets called at interrupt time, and so it 15874543df7eSChris Mason * cannot dynamically grow. 15884543df7eSChris Mason */ 15895443be45SChris Mason btrfs_init_workers(&fs_info->workers, "worker", 15905443be45SChris Mason fs_info->thread_pool_size); 1591c8b97818SChris Mason 1592771ed689SChris Mason btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", 1593771ed689SChris Mason fs_info->thread_pool_size); 1594771ed689SChris Mason 15955443be45SChris Mason btrfs_init_workers(&fs_info->submit_workers, "submit", 1596b720d209SChris Mason min_t(u64, fs_devices->num_devices, 1597b720d209SChris Mason fs_info->thread_pool_size)); 159861b49440SChris Mason 159961b49440SChris Mason /* a higher idle thresh on the submit workers makes it much more 160061b49440SChris Mason * likely that bios will be send down in a sane order to the 160161b49440SChris Mason * devices 160261b49440SChris Mason */ 160361b49440SChris Mason fs_info->submit_workers.idle_thresh = 64; 160453863232SChris Mason 1605771ed689SChris Mason fs_info->workers.idle_thresh = 16; 16064a69a410SChris Mason fs_info->workers.ordered = 1; 160761b49440SChris Mason 1608771ed689SChris Mason fs_info->delalloc_workers.idle_thresh = 2; 1609771ed689SChris Mason fs_info->delalloc_workers.ordered = 1; 1610771ed689SChris Mason 16115443be45SChris Mason btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1); 16125443be45SChris Mason btrfs_init_workers(&fs_info->endio_workers, "endio", 16135443be45SChris Mason fs_info->thread_pool_size); 16145443be45SChris Mason btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", 1615e6dcd2dcSChris Mason fs_info->thread_pool_size); 161661b49440SChris Mason 161761b49440SChris Mason /* 161861b49440SChris Mason * endios are largely parallel and should have a very 161961b49440SChris Mason * low idle thresh 162061b49440SChris Mason */ 162161b49440SChris Mason fs_info->endio_workers.idle_thresh = 4; 16223a5f1d45SChris Mason fs_info->endio_write_workers.idle_thresh = 64; 162361b49440SChris Mason 16244543df7eSChris Mason btrfs_start_workers(&fs_info->workers, 1); 16251cc127b5SChris Mason btrfs_start_workers(&fs_info->submit_workers, 1); 1626771ed689SChris Mason btrfs_start_workers(&fs_info->delalloc_workers, 1); 1627247e743cSChris Mason btrfs_start_workers(&fs_info->fixup_workers, 1); 16284543df7eSChris Mason btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size); 1629e6dcd2dcSChris Mason btrfs_start_workers(&fs_info->endio_write_workers, 1630e6dcd2dcSChris Mason fs_info->thread_pool_size); 16314543df7eSChris Mason 16324575c9ccSChris Mason fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); 1633c8b97818SChris Mason fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, 1634c8b97818SChris Mason 4 * 1024 * 1024 / PAGE_CACHE_SIZE); 16354575c9ccSChris Mason 1636db94535dSChris Mason nodesize = btrfs_super_nodesize(disk_super); 1637db94535dSChris Mason leafsize = btrfs_super_leafsize(disk_super); 1638db94535dSChris Mason sectorsize = btrfs_super_sectorsize(disk_super); 163987ee04ebSChris Mason stripesize = btrfs_super_stripesize(disk_super); 1640db94535dSChris Mason tree_root->nodesize = nodesize; 1641db94535dSChris Mason tree_root->leafsize = leafsize; 1642db94535dSChris Mason tree_root->sectorsize = sectorsize; 164387ee04ebSChris Mason tree_root->stripesize = stripesize; 1644a061fc8dSChris Mason 1645a061fc8dSChris Mason sb->s_blocksize = sectorsize; 1646a061fc8dSChris Mason sb->s_blocksize_bits = blksize_bits(sectorsize); 1647db94535dSChris Mason 164839279cc3SChris Mason if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, 164939279cc3SChris Mason sizeof(disk_super->magic))) { 165039279cc3SChris Mason printk("btrfs: valid FS not found on %s\n", sb->s_id); 165139279cc3SChris Mason goto fail_sb_buffer; 165239279cc3SChris Mason } 165319c00ddcSChris Mason 1654925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 16550b86a832SChris Mason ret = btrfs_read_sys_array(tree_root); 1656925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 165784eed90fSChris Mason if (ret) { 165884eed90fSChris Mason printk("btrfs: failed to read the system array on %s\n", 165984eed90fSChris Mason sb->s_id); 166084eed90fSChris Mason goto fail_sys_array; 166184eed90fSChris Mason } 16620b86a832SChris Mason 16630b86a832SChris Mason blocksize = btrfs_level_size(tree_root, 16640b86a832SChris Mason btrfs_super_chunk_root_level(disk_super)); 166584234f3aSYan Zheng generation = btrfs_super_chunk_root_generation(disk_super); 16660b86a832SChris Mason 16670b86a832SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 16680b86a832SChris Mason chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); 16690b86a832SChris Mason 16700b86a832SChris Mason chunk_root->node = read_tree_block(chunk_root, 16710b86a832SChris Mason btrfs_super_chunk_root(disk_super), 167284234f3aSYan Zheng blocksize, generation); 16730b86a832SChris Mason BUG_ON(!chunk_root->node); 16740b86a832SChris Mason 1675e17cade2SChris Mason read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, 1676e17cade2SChris Mason (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), 1677e17cade2SChris Mason BTRFS_UUID_SIZE); 1678e17cade2SChris Mason 1679925baeddSChris Mason mutex_lock(&fs_info->chunk_mutex); 16800b86a832SChris Mason ret = btrfs_read_chunk_tree(chunk_root); 1681925baeddSChris Mason mutex_unlock(&fs_info->chunk_mutex); 16822b82032cSYan Zheng if (ret) { 16832b82032cSYan Zheng printk("btrfs: failed to read chunk tree on %s\n", sb->s_id); 16842b82032cSYan Zheng goto fail_chunk_root; 16852b82032cSYan Zheng } 16860b86a832SChris Mason 1687dfe25020SChris Mason btrfs_close_extra_devices(fs_devices); 1688dfe25020SChris Mason 1689db94535dSChris Mason blocksize = btrfs_level_size(tree_root, 1690db94535dSChris Mason btrfs_super_root_level(disk_super)); 169184234f3aSYan Zheng generation = btrfs_super_generation(disk_super); 16920b86a832SChris Mason 1693e20d96d6SChris Mason tree_root->node = read_tree_block(tree_root, 1694db94535dSChris Mason btrfs_super_root(disk_super), 169584234f3aSYan Zheng blocksize, generation); 169639279cc3SChris Mason if (!tree_root->node) 16972b82032cSYan Zheng goto fail_chunk_root; 16983768f368SChris Mason 1699db94535dSChris Mason 1700db94535dSChris Mason ret = find_and_setup_root(tree_root, fs_info, 1701e20d96d6SChris Mason BTRFS_EXTENT_TREE_OBJECTID, extent_root); 17020b86a832SChris Mason if (ret) 170339279cc3SChris Mason goto fail_tree_root; 17040b86a832SChris Mason extent_root->track_dirty = 1; 17050b86a832SChris Mason 17060b86a832SChris Mason ret = find_and_setup_root(tree_root, fs_info, 17070b86a832SChris Mason BTRFS_DEV_TREE_OBJECTID, dev_root); 17080b86a832SChris Mason dev_root->track_dirty = 1; 17090b86a832SChris Mason 17100b86a832SChris Mason if (ret) 17110b86a832SChris Mason goto fail_extent_root; 17123768f368SChris Mason 17139078a3e1SChris Mason btrfs_read_block_groups(extent_root); 17149078a3e1SChris Mason 1715c146afadSYan Zheng fs_info->generation = generation + 1; 1716c146afadSYan Zheng fs_info->last_trans_committed = generation; 1717d18a2c44SChris Mason fs_info->data_alloc_profile = (u64)-1; 1718d18a2c44SChris Mason fs_info->metadata_alloc_profile = (u64)-1; 1719611f0e00SChris Mason fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; 1720a74a4b97SChris Mason fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, 1721a74a4b97SChris Mason "btrfs-cleaner"); 1722a74a4b97SChris Mason if (!fs_info->cleaner_kthread) 1723a74a4b97SChris Mason goto fail_extent_root; 1724a74a4b97SChris Mason 1725a74a4b97SChris Mason fs_info->transaction_kthread = kthread_run(transaction_kthread, 1726a74a4b97SChris Mason tree_root, 1727a74a4b97SChris Mason "btrfs-transaction"); 1728a74a4b97SChris Mason if (!fs_info->transaction_kthread) 17293f157a2fSChris Mason goto fail_cleaner; 1730a74a4b97SChris Mason 1731c146afadSYan Zheng if (sb->s_flags & MS_RDONLY) 1732c146afadSYan Zheng return tree_root; 1733c146afadSYan Zheng 1734e02119d5SChris Mason if (btrfs_super_log_root(disk_super) != 0) { 1735e02119d5SChris Mason u32 blocksize; 1736e02119d5SChris Mason u64 bytenr = btrfs_super_log_root(disk_super); 1737d18a2c44SChris Mason 1738e02119d5SChris Mason blocksize = 1739e02119d5SChris Mason btrfs_level_size(tree_root, 1740e02119d5SChris Mason btrfs_super_log_root_level(disk_super)); 1741e02119d5SChris Mason 1742e02119d5SChris Mason log_tree_root = kzalloc(sizeof(struct btrfs_root), 1743e02119d5SChris Mason GFP_NOFS); 1744e02119d5SChris Mason 1745e02119d5SChris Mason __setup_root(nodesize, leafsize, sectorsize, stripesize, 1746e02119d5SChris Mason log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); 1747e02119d5SChris Mason 1748e02119d5SChris Mason log_tree_root->node = read_tree_block(tree_root, bytenr, 174984234f3aSYan Zheng blocksize, 175084234f3aSYan Zheng generation + 1); 1751e02119d5SChris Mason ret = btrfs_recover_log_trees(log_tree_root); 1752e02119d5SChris Mason BUG_ON(ret); 1753e02119d5SChris Mason } 17541a40e23bSZheng Yan 17551a40e23bSZheng Yan ret = btrfs_cleanup_reloc_trees(tree_root); 17561a40e23bSZheng Yan BUG_ON(ret); 17571a40e23bSZheng Yan 17580f7d52f4SChris Mason return tree_root; 175939279cc3SChris Mason 17603f157a2fSChris Mason fail_cleaner: 1761a74a4b97SChris Mason kthread_stop(fs_info->cleaner_kthread); 17620b86a832SChris Mason fail_extent_root: 17630b86a832SChris Mason free_extent_buffer(extent_root->node); 176439279cc3SChris Mason fail_tree_root: 17655f39d397SChris Mason free_extent_buffer(tree_root->node); 17662b82032cSYan Zheng fail_chunk_root: 17672b82032cSYan Zheng free_extent_buffer(chunk_root->node); 176884eed90fSChris Mason fail_sys_array: 176939279cc3SChris Mason fail_sb_buffer: 1770247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 1771771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 17728b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 17738b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 1774e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 17751cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 17764543df7eSChris Mason fail_iput: 17774543df7eSChris Mason iput(fs_info->btree_inode); 177839279cc3SChris Mason fail: 1779dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 178084eed90fSChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 178184eed90fSChris Mason 178239279cc3SChris Mason kfree(extent_root); 178339279cc3SChris Mason kfree(tree_root); 17842d2ae547SChris Mason bdi_destroy(&fs_info->bdi); 178539279cc3SChris Mason kfree(fs_info); 178683afeac4SJim Meyering kfree(chunk_root); 178783afeac4SJim Meyering kfree(dev_root); 178839279cc3SChris Mason return ERR_PTR(err); 1789eb60ceacSChris Mason } 1790eb60ceacSChris Mason 1791f2984462SChris Mason static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) 1792f2984462SChris Mason { 1793f2984462SChris Mason char b[BDEVNAME_SIZE]; 1794f2984462SChris Mason 1795f2984462SChris Mason if (uptodate) { 1796f2984462SChris Mason set_buffer_uptodate(bh); 1797f2984462SChris Mason } else { 1798f2984462SChris Mason if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { 1799f2984462SChris Mason printk(KERN_WARNING "lost page write due to " 1800f2984462SChris Mason "I/O error on %s\n", 1801f2984462SChris Mason bdevname(bh->b_bdev, b)); 1802f2984462SChris Mason } 18031259ab75SChris Mason /* note, we dont' set_buffer_write_io_error because we have 18041259ab75SChris Mason * our own ways of dealing with the IO errors 18051259ab75SChris Mason */ 1806f2984462SChris Mason clear_buffer_uptodate(bh); 1807f2984462SChris Mason } 1808f2984462SChris Mason unlock_buffer(bh); 1809f2984462SChris Mason put_bh(bh); 1810f2984462SChris Mason } 1811f2984462SChris Mason 1812f2984462SChris Mason int write_all_supers(struct btrfs_root *root) 1813f2984462SChris Mason { 1814f2984462SChris Mason struct list_head *cur; 1815f2984462SChris Mason struct list_head *head = &root->fs_info->fs_devices->devices; 1816f2984462SChris Mason struct btrfs_device *dev; 1817a061fc8dSChris Mason struct btrfs_super_block *sb; 1818f2984462SChris Mason struct btrfs_dev_item *dev_item; 1819f2984462SChris Mason struct buffer_head *bh; 1820f2984462SChris Mason int ret; 1821f2984462SChris Mason int do_barriers; 1822a236aed1SChris Mason int max_errors; 1823a236aed1SChris Mason int total_errors = 0; 1824a061fc8dSChris Mason u32 crc; 1825a061fc8dSChris Mason u64 flags; 1826f2984462SChris Mason 1827a236aed1SChris Mason max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; 1828f2984462SChris Mason do_barriers = !btrfs_test_opt(root, NOBARRIER); 1829f2984462SChris Mason 1830a061fc8dSChris Mason sb = &root->fs_info->super_for_commit; 1831a061fc8dSChris Mason dev_item = &sb->dev_item; 1832f2984462SChris Mason list_for_each(cur, head) { 1833f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1834dfe25020SChris Mason if (!dev->bdev) { 1835dfe25020SChris Mason total_errors++; 1836dfe25020SChris Mason continue; 1837dfe25020SChris Mason } 18382b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 1839dfe25020SChris Mason continue; 1840dfe25020SChris Mason 18412b82032cSYan Zheng btrfs_set_stack_device_generation(dev_item, 0); 1842a061fc8dSChris Mason btrfs_set_stack_device_type(dev_item, dev->type); 1843a061fc8dSChris Mason btrfs_set_stack_device_id(dev_item, dev->devid); 1844a061fc8dSChris Mason btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); 1845a061fc8dSChris Mason btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); 1846a061fc8dSChris Mason btrfs_set_stack_device_io_align(dev_item, dev->io_align); 1847a061fc8dSChris Mason btrfs_set_stack_device_io_width(dev_item, dev->io_width); 1848a061fc8dSChris Mason btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); 1849a061fc8dSChris Mason memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); 18502b82032cSYan Zheng memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 1851a061fc8dSChris Mason flags = btrfs_super_flags(sb); 1852a061fc8dSChris Mason btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); 1853f2984462SChris Mason 1854f2984462SChris Mason 1855a061fc8dSChris Mason crc = ~(u32)0; 1856a061fc8dSChris Mason crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc, 1857a061fc8dSChris Mason BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); 1858a061fc8dSChris Mason btrfs_csum_final(crc, sb->csum); 1859a061fc8dSChris Mason 1860a061fc8dSChris Mason bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 1861f2984462SChris Mason BTRFS_SUPER_INFO_SIZE); 1862f2984462SChris Mason 1863a061fc8dSChris Mason memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); 1864f2984462SChris Mason dev->pending_io = bh; 1865f2984462SChris Mason 1866f2984462SChris Mason get_bh(bh); 1867f2984462SChris Mason set_buffer_uptodate(bh); 1868f2984462SChris Mason lock_buffer(bh); 1869f2984462SChris Mason bh->b_end_io = btrfs_end_buffer_write_sync; 1870f2984462SChris Mason 1871f2984462SChris Mason if (do_barriers && dev->barriers) { 1872f2984462SChris Mason ret = submit_bh(WRITE_BARRIER, bh); 1873f2984462SChris Mason if (ret == -EOPNOTSUPP) { 1874f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1875f2984462SChris Mason dev->name); 1876f2984462SChris Mason set_buffer_uptodate(bh); 1877f2984462SChris Mason dev->barriers = 0; 1878f2984462SChris Mason get_bh(bh); 1879f2984462SChris Mason lock_buffer(bh); 1880f2984462SChris Mason ret = submit_bh(WRITE, bh); 1881f2984462SChris Mason } 1882f2984462SChris Mason } else { 1883f2984462SChris Mason ret = submit_bh(WRITE, bh); 1884f2984462SChris Mason } 1885a236aed1SChris Mason if (ret) 1886a236aed1SChris Mason total_errors++; 1887f2984462SChris Mason } 1888a236aed1SChris Mason if (total_errors > max_errors) { 1889a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1890a236aed1SChris Mason BUG(); 1891a236aed1SChris Mason } 1892a236aed1SChris Mason total_errors = 0; 1893f2984462SChris Mason 1894f2984462SChris Mason list_for_each(cur, head) { 1895f2984462SChris Mason dev = list_entry(cur, struct btrfs_device, dev_list); 1896dfe25020SChris Mason if (!dev->bdev) 1897dfe25020SChris Mason continue; 18982b82032cSYan Zheng if (!dev->in_fs_metadata || !dev->writeable) 1899dfe25020SChris Mason continue; 1900dfe25020SChris Mason 1901f2984462SChris Mason BUG_ON(!dev->pending_io); 1902f2984462SChris Mason bh = dev->pending_io; 1903f2984462SChris Mason wait_on_buffer(bh); 1904f2984462SChris Mason if (!buffer_uptodate(dev->pending_io)) { 1905f2984462SChris Mason if (do_barriers && dev->barriers) { 1906f2984462SChris Mason printk("btrfs: disabling barriers on dev %s\n", 1907f2984462SChris Mason dev->name); 1908f2984462SChris Mason set_buffer_uptodate(bh); 1909f2984462SChris Mason get_bh(bh); 1910f2984462SChris Mason lock_buffer(bh); 1911f2984462SChris Mason dev->barriers = 0; 1912f2984462SChris Mason ret = submit_bh(WRITE, bh); 1913f2984462SChris Mason BUG_ON(ret); 1914f2984462SChris Mason wait_on_buffer(bh); 19151259ab75SChris Mason if (!buffer_uptodate(bh)) 19161259ab75SChris Mason total_errors++; 1917f2984462SChris Mason } else { 1918a236aed1SChris Mason total_errors++; 1919f2984462SChris Mason } 1920f2984462SChris Mason 1921f2984462SChris Mason } 1922f2984462SChris Mason dev->pending_io = NULL; 1923f2984462SChris Mason brelse(bh); 1924f2984462SChris Mason } 1925a236aed1SChris Mason if (total_errors > max_errors) { 1926a236aed1SChris Mason printk("btrfs: %d errors while writing supers\n", total_errors); 1927a236aed1SChris Mason BUG(); 1928a236aed1SChris Mason } 1929f2984462SChris Mason return 0; 1930f2984462SChris Mason } 1931f2984462SChris Mason 1932e089f05cSChris Mason int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root 193379154b1bSChris Mason *root) 1934cfaa7295SChris Mason { 1935e66f709bSChris Mason int ret; 19362c90e5d6SChris Mason 1937f2984462SChris Mason ret = write_all_supers(root); 19385f39d397SChris Mason return ret; 1939cfaa7295SChris Mason } 1940cfaa7295SChris Mason 19415eda7b5eSChris Mason int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) 19422619ba1fSChris Mason { 19432619ba1fSChris Mason radix_tree_delete(&fs_info->fs_roots_radix, 19442619ba1fSChris Mason (unsigned long)root->root_key.objectid); 1945b99aa6cbSChris Mason if (root->in_sysfs) 194658176a96SJosef Bacik btrfs_sysfs_del_root(root); 19472619ba1fSChris Mason if (root->inode) 19482619ba1fSChris Mason iput(root->inode); 19492619ba1fSChris Mason if (root->node) 19505f39d397SChris Mason free_extent_buffer(root->node); 19512619ba1fSChris Mason if (root->commit_root) 19525f39d397SChris Mason free_extent_buffer(root->commit_root); 195358176a96SJosef Bacik if (root->name) 195458176a96SJosef Bacik kfree(root->name); 19552619ba1fSChris Mason kfree(root); 19562619ba1fSChris Mason return 0; 19572619ba1fSChris Mason } 19582619ba1fSChris Mason 195935b7e476SChris Mason static int del_fs_roots(struct btrfs_fs_info *fs_info) 19600f7d52f4SChris Mason { 19610f7d52f4SChris Mason int ret; 19620f7d52f4SChris Mason struct btrfs_root *gang[8]; 19630f7d52f4SChris Mason int i; 19640f7d52f4SChris Mason 19650f7d52f4SChris Mason while(1) { 19660f7d52f4SChris Mason ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 19670f7d52f4SChris Mason (void **)gang, 0, 19680f7d52f4SChris Mason ARRAY_SIZE(gang)); 19690f7d52f4SChris Mason if (!ret) 19700f7d52f4SChris Mason break; 19712619ba1fSChris Mason for (i = 0; i < ret; i++) 19725eda7b5eSChris Mason btrfs_free_fs_root(fs_info, gang[i]); 19730f7d52f4SChris Mason } 19740f7d52f4SChris Mason return 0; 19750f7d52f4SChris Mason } 1976b4100d64SChris Mason 1977c146afadSYan Zheng int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) 1978c146afadSYan Zheng { 1979c146afadSYan Zheng u64 root_objectid = 0; 1980c146afadSYan Zheng struct btrfs_root *gang[8]; 1981c146afadSYan Zheng int i; 1982c146afadSYan Zheng int ret; 1983c146afadSYan Zheng 1984c146afadSYan Zheng while (1) { 1985c146afadSYan Zheng ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, 1986c146afadSYan Zheng (void **)gang, root_objectid, 1987c146afadSYan Zheng ARRAY_SIZE(gang)); 1988c146afadSYan Zheng if (!ret) 1989c146afadSYan Zheng break; 1990c146afadSYan Zheng for (i = 0; i < ret; i++) { 1991c146afadSYan Zheng root_objectid = gang[i]->root_key.objectid; 1992c146afadSYan Zheng ret = btrfs_find_dead_roots(fs_info->tree_root, 1993c146afadSYan Zheng root_objectid, gang[i]); 1994c146afadSYan Zheng BUG_ON(ret); 1995c146afadSYan Zheng btrfs_orphan_cleanup(gang[i]); 1996c146afadSYan Zheng } 1997c146afadSYan Zheng root_objectid++; 1998c146afadSYan Zheng } 1999c146afadSYan Zheng return 0; 2000c146afadSYan Zheng } 2001c146afadSYan Zheng 2002c146afadSYan Zheng int btrfs_commit_super(struct btrfs_root *root) 2003c146afadSYan Zheng { 2004c146afadSYan Zheng struct btrfs_trans_handle *trans; 2005c146afadSYan Zheng int ret; 2006c146afadSYan Zheng 2007c146afadSYan Zheng mutex_lock(&root->fs_info->cleaner_mutex); 2008c146afadSYan Zheng btrfs_clean_old_snapshots(root); 2009c146afadSYan Zheng mutex_unlock(&root->fs_info->cleaner_mutex); 2010c146afadSYan Zheng trans = btrfs_start_transaction(root, 1); 2011c146afadSYan Zheng ret = btrfs_commit_transaction(trans, root); 2012c146afadSYan Zheng BUG_ON(ret); 2013c146afadSYan Zheng /* run commit again to drop the original snapshot */ 2014c146afadSYan Zheng trans = btrfs_start_transaction(root, 1); 2015c146afadSYan Zheng btrfs_commit_transaction(trans, root); 2016c146afadSYan Zheng ret = btrfs_write_and_wait_transaction(NULL, root); 2017c146afadSYan Zheng BUG_ON(ret); 2018c146afadSYan Zheng 2019c146afadSYan Zheng ret = write_ctree_super(NULL, root); 2020c146afadSYan Zheng return ret; 2021c146afadSYan Zheng } 2022c146afadSYan Zheng 2023e20d96d6SChris Mason int close_ctree(struct btrfs_root *root) 2024eb60ceacSChris Mason { 20250f7d52f4SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 2026c146afadSYan Zheng int ret; 2027e089f05cSChris Mason 2028facda1e7SChris Mason fs_info->closing = 1; 2029a2135011SChris Mason smp_mb(); 2030a2135011SChris Mason 2031a74a4b97SChris Mason kthread_stop(root->fs_info->transaction_kthread); 2032a74a4b97SChris Mason kthread_stop(root->fs_info->cleaner_kthread); 2033a74a4b97SChris Mason 2034c146afadSYan Zheng if (!(fs_info->sb->s_flags & MS_RDONLY)) { 2035c146afadSYan Zheng ret = btrfs_commit_super(root); 2036c146afadSYan Zheng if (ret) { 2037c146afadSYan Zheng printk("btrfs: commit super returns %d\n", ret); 2038c146afadSYan Zheng } 2039c146afadSYan Zheng } 2040ed2ff2cbSChris Mason 2041b0c68f8bSChris Mason if (fs_info->delalloc_bytes) { 2042b0c68f8bSChris Mason printk("btrfs: at unmount delalloc count %Lu\n", 2043b0c68f8bSChris Mason fs_info->delalloc_bytes); 2044b0c68f8bSChris Mason } 204531153d81SYan Zheng if (fs_info->total_ref_cache_size) { 204631153d81SYan Zheng printk("btrfs: at umount reference cache size %Lu\n", 204731153d81SYan Zheng fs_info->total_ref_cache_size); 204831153d81SYan Zheng } 204931153d81SYan Zheng 20500f7d52f4SChris Mason if (fs_info->extent_root->node) 20515f39d397SChris Mason free_extent_buffer(fs_info->extent_root->node); 2052f510cfecSChris Mason 20530f7d52f4SChris Mason if (fs_info->tree_root->node) 20545f39d397SChris Mason free_extent_buffer(fs_info->tree_root->node); 2055f510cfecSChris Mason 20560b86a832SChris Mason if (root->fs_info->chunk_root->node); 20570b86a832SChris Mason free_extent_buffer(root->fs_info->chunk_root->node); 20580b86a832SChris Mason 20590b86a832SChris Mason if (root->fs_info->dev_root->node); 20600b86a832SChris Mason free_extent_buffer(root->fs_info->dev_root->node); 20610b86a832SChris Mason 20629078a3e1SChris Mason btrfs_free_block_groups(root->fs_info); 2063c146afadSYan Zheng 20640f7d52f4SChris Mason del_fs_roots(fs_info); 2065d10c5f31SChris Mason 2066c146afadSYan Zheng iput(fs_info->btree_inode); 20679ad6b7bcSChris Mason 2068247e743cSChris Mason btrfs_stop_workers(&fs_info->fixup_workers); 2069771ed689SChris Mason btrfs_stop_workers(&fs_info->delalloc_workers); 20708b712842SChris Mason btrfs_stop_workers(&fs_info->workers); 20718b712842SChris Mason btrfs_stop_workers(&fs_info->endio_workers); 2072e6dcd2dcSChris Mason btrfs_stop_workers(&fs_info->endio_write_workers); 20731cc127b5SChris Mason btrfs_stop_workers(&fs_info->submit_workers); 2074d6bfde87SChris Mason 207519c00ddcSChris Mason #if 0 207619c00ddcSChris Mason while(!list_empty(&fs_info->hashers)) { 207719c00ddcSChris Mason struct btrfs_hasher *hasher; 207819c00ddcSChris Mason hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher, 207919c00ddcSChris Mason hashers); 208019c00ddcSChris Mason list_del(&hasher->hashers); 208119c00ddcSChris Mason crypto_free_hash(&fs_info->hash_tfm); 208219c00ddcSChris Mason kfree(hasher); 208319c00ddcSChris Mason } 208419c00ddcSChris Mason #endif 2085dfe25020SChris Mason btrfs_close_devices(fs_info->fs_devices); 20860b86a832SChris Mason btrfs_mapping_tree_free(&fs_info->mapping_tree); 2087b248a415SChris Mason 208804160088SChris Mason bdi_destroy(&fs_info->bdi); 20890b86a832SChris Mason 20900f7d52f4SChris Mason kfree(fs_info->extent_root); 20910f7d52f4SChris Mason kfree(fs_info->tree_root); 20920b86a832SChris Mason kfree(fs_info->chunk_root); 20930b86a832SChris Mason kfree(fs_info->dev_root); 2094eb60ceacSChris Mason return 0; 2095eb60ceacSChris Mason } 2096eb60ceacSChris Mason 20971259ab75SChris Mason int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) 2098ccd467d6SChris Mason { 20991259ab75SChris Mason int ret; 2100810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 21011259ab75SChris Mason 21021259ab75SChris Mason ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); 21031259ab75SChris Mason if (!ret) 21041259ab75SChris Mason return ret; 21051259ab75SChris Mason 21061259ab75SChris Mason ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, 21071259ab75SChris Mason parent_transid); 21081259ab75SChris Mason return !ret; 21095f39d397SChris Mason } 21106702ed49SChris Mason 21115f39d397SChris Mason int btrfs_set_buffer_uptodate(struct extent_buffer *buf) 21125f39d397SChris Mason { 2113810191ffSChris Mason struct inode *btree_inode = buf->first_page->mapping->host; 2114d1310b2eSChris Mason return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, 21155f39d397SChris Mason buf); 21165f39d397SChris Mason } 21175f39d397SChris Mason 21185f39d397SChris Mason void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 21195f39d397SChris Mason { 2120810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 21215f39d397SChris Mason u64 transid = btrfs_header_generation(buf); 21225f39d397SChris Mason struct inode *btree_inode = root->fs_info->btree_inode; 21236702ed49SChris Mason 2124925baeddSChris Mason WARN_ON(!btrfs_tree_locked(buf)); 2125ccd467d6SChris Mason if (transid != root->fs_info->generation) { 2126ccd467d6SChris Mason printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", 2127db94535dSChris Mason (unsigned long long)buf->start, 2128ccd467d6SChris Mason transid, root->fs_info->generation); 2129ccd467d6SChris Mason WARN_ON(1); 2130ccd467d6SChris Mason } 2131d1310b2eSChris Mason set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); 2132eb60ceacSChris Mason } 2133eb60ceacSChris Mason 2134d3c2fdcfSChris Mason void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) 213535b7e476SChris Mason { 2136188de649SChris Mason /* 2137188de649SChris Mason * looks as though older kernels can get into trouble with 2138188de649SChris Mason * this code, they end up stuck in balance_dirty_pages forever 2139188de649SChris Mason */ 2140d6bfde87SChris Mason struct extent_io_tree *tree; 2141d6bfde87SChris Mason u64 num_dirty; 2142d6bfde87SChris Mason u64 start = 0; 2143771ed689SChris Mason unsigned long thresh = 32 * 1024 * 1024; 2144d6bfde87SChris Mason tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; 2145d6bfde87SChris Mason 2146b64a2851SChris Mason if (current_is_pdflush() || current->flags & PF_MEMALLOC) 2147d6bfde87SChris Mason return; 2148d6bfde87SChris Mason 2149d6bfde87SChris Mason num_dirty = count_range_bits(tree, &start, (u64)-1, 2150d6bfde87SChris Mason thresh, EXTENT_DIRTY); 2151d6bfde87SChris Mason if (num_dirty > thresh) { 2152d3c2fdcfSChris Mason balance_dirty_pages_ratelimited_nr( 2153304fced6SChris Mason root->fs_info->btree_inode->i_mapping, 1); 215435b7e476SChris Mason } 2155188de649SChris Mason return; 2156d6bfde87SChris Mason } 21576b80053dSChris Mason 2158ca7a79adSChris Mason int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 21596b80053dSChris Mason { 2160810191ffSChris Mason struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; 2161ce9adaa5SChris Mason int ret; 2162ca7a79adSChris Mason ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); 2163ce9adaa5SChris Mason if (ret == 0) { 2164ce9adaa5SChris Mason buf->flags |= EXTENT_UPTODATE; 2165ce9adaa5SChris Mason } 2166ce9adaa5SChris Mason return ret; 21676b80053dSChris Mason } 21680da5468fSChris Mason 21694bef0848SChris Mason int btree_lock_page_hook(struct page *page) 21704bef0848SChris Mason { 21714bef0848SChris Mason struct inode *inode = page->mapping->host; 21724bef0848SChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 21734bef0848SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 21744bef0848SChris Mason struct extent_buffer *eb; 21754bef0848SChris Mason unsigned long len; 21764bef0848SChris Mason u64 bytenr = page_offset(page); 21774bef0848SChris Mason 21784bef0848SChris Mason if (page->private == EXTENT_PAGE_PRIVATE) 21794bef0848SChris Mason goto out; 21804bef0848SChris Mason 21814bef0848SChris Mason len = page->private >> 2; 21824bef0848SChris Mason eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); 21834bef0848SChris Mason if (!eb) 21844bef0848SChris Mason goto out; 21854bef0848SChris Mason 21864bef0848SChris Mason btrfs_tree_lock(eb); 21874bef0848SChris Mason spin_lock(&root->fs_info->hash_lock); 21884bef0848SChris Mason btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); 21894bef0848SChris Mason spin_unlock(&root->fs_info->hash_lock); 21904bef0848SChris Mason btrfs_tree_unlock(eb); 21914bef0848SChris Mason free_extent_buffer(eb); 21924bef0848SChris Mason out: 21934bef0848SChris Mason lock_page(page); 21944bef0848SChris Mason return 0; 21954bef0848SChris Mason } 21964bef0848SChris Mason 2197d1310b2eSChris Mason static struct extent_io_ops btree_extent_io_ops = { 21984bef0848SChris Mason .write_cache_pages_lock_hook = btree_lock_page_hook, 2199ce9adaa5SChris Mason .readpage_end_io_hook = btree_readpage_end_io_hook, 22000b86a832SChris Mason .submit_bio_hook = btree_submit_bio_hook, 2201239b14b3SChris Mason /* note we're sharing with inode.c for the merge bio hook */ 2202239b14b3SChris Mason .merge_bio_hook = btrfs_merge_bio_hook, 22030da5468fSChris Mason }; 2204