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 1979154b1bSChris Mason #include <linux/fs.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 2134088780SChris Mason #include <linux/sched.h> 22d3c2fdcfSChris Mason #include <linux/writeback.h> 235f39d397SChris Mason #include <linux/pagemap.h> 245f2cc086SChris Mason #include <linux/blkdev.h> 2579154b1bSChris Mason #include "ctree.h" 2679154b1bSChris Mason #include "disk-io.h" 2779154b1bSChris Mason #include "transaction.h" 28925baeddSChris Mason #include "locking.h" 29e02119d5SChris Mason #include "tree-log.h" 30581bb050SLi Zefan #include "inode-map.h" 31733f4fbbSStefan Behrens #include "volumes.h" 3279154b1bSChris Mason 330f7d52f4SChris Mason #define BTRFS_ROOT_TRANS_TAG 0 340f7d52f4SChris Mason 3549b25e05SJeff Mahoney void put_transaction(struct btrfs_transaction *transaction) 3679154b1bSChris Mason { 3713c5a93eSJosef Bacik WARN_ON(atomic_read(&transaction->use_count) == 0); 3813c5a93eSJosef Bacik if (atomic_dec_and_test(&transaction->use_count)) { 39a4abeea4SJosef Bacik BUG_ON(!list_empty(&transaction->list)); 4000f04b88SArne Jansen WARN_ON(transaction->delayed_refs.root.rb_node); 4100f04b88SArne Jansen WARN_ON(!list_empty(&transaction->delayed_refs.seq_head)); 422c90e5d6SChris Mason memset(transaction, 0, sizeof(*transaction)); 432c90e5d6SChris Mason kmem_cache_free(btrfs_transaction_cachep, transaction); 4479154b1bSChris Mason } 4578fae27eSChris Mason } 4679154b1bSChris Mason 47817d52f8SJosef Bacik static noinline void switch_commit_root(struct btrfs_root *root) 48817d52f8SJosef Bacik { 49817d52f8SJosef Bacik free_extent_buffer(root->commit_root); 50817d52f8SJosef Bacik root->commit_root = btrfs_root_node(root); 51817d52f8SJosef Bacik } 52817d52f8SJosef Bacik 53d352ac68SChris Mason /* 54d352ac68SChris Mason * either allocate a new transaction or hop into the existing one 55d352ac68SChris Mason */ 56a4abeea4SJosef Bacik static noinline int join_transaction(struct btrfs_root *root, int nofail) 5779154b1bSChris Mason { 5879154b1bSChris Mason struct btrfs_transaction *cur_trans; 5919ae4e81SJan Schmidt struct btrfs_fs_info *fs_info = root->fs_info; 60a4abeea4SJosef Bacik 6119ae4e81SJan Schmidt spin_lock(&fs_info->trans_lock); 62d43317dcSChris Mason loop: 6349b25e05SJeff Mahoney /* The file system has been taken offline. No new transactions. */ 6419ae4e81SJan Schmidt if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 6519ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 6649b25e05SJeff Mahoney return -EROFS; 6749b25e05SJeff Mahoney } 6849b25e05SJeff Mahoney 6919ae4e81SJan Schmidt if (fs_info->trans_no_join) { 70a4abeea4SJosef Bacik if (!nofail) { 7119ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 72a4abeea4SJosef Bacik return -EBUSY; 73a4abeea4SJosef Bacik } 74a4abeea4SJosef Bacik } 75a4abeea4SJosef Bacik 7619ae4e81SJan Schmidt cur_trans = fs_info->running_transaction; 77a4abeea4SJosef Bacik if (cur_trans) { 78871383beSDavid Sterba if (cur_trans->aborted) { 7919ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 8049b25e05SJeff Mahoney return cur_trans->aborted; 81871383beSDavid Sterba } 82a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 83a4abeea4SJosef Bacik atomic_inc(&cur_trans->num_writers); 84a4abeea4SJosef Bacik cur_trans->num_joined++; 8519ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 86a4abeea4SJosef Bacik return 0; 87a4abeea4SJosef Bacik } 8819ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 89a4abeea4SJosef Bacik 90a4abeea4SJosef Bacik cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); 91db5b493aSTsutomu Itoh if (!cur_trans) 92db5b493aSTsutomu Itoh return -ENOMEM; 93d43317dcSChris Mason 9419ae4e81SJan Schmidt spin_lock(&fs_info->trans_lock); 9519ae4e81SJan Schmidt if (fs_info->running_transaction) { 96d43317dcSChris Mason /* 97d43317dcSChris Mason * someone started a transaction after we unlocked. Make sure 98d43317dcSChris Mason * to redo the trans_no_join checks above 99d43317dcSChris Mason */ 100a4abeea4SJosef Bacik kmem_cache_free(btrfs_transaction_cachep, cur_trans); 10119ae4e81SJan Schmidt cur_trans = fs_info->running_transaction; 102d43317dcSChris Mason goto loop; 1037b8b92afSJosef Bacik } else if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 1047b8b92afSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1057b8b92afSJosef Bacik kmem_cache_free(btrfs_transaction_cachep, cur_trans); 1067b8b92afSJosef Bacik return -EROFS; 107a4abeea4SJosef Bacik } 108d43317dcSChris Mason 10913c5a93eSJosef Bacik atomic_set(&cur_trans->num_writers, 1); 11015ee9bc7SJosef Bacik cur_trans->num_joined = 0; 11179154b1bSChris Mason init_waitqueue_head(&cur_trans->writer_wait); 11279154b1bSChris Mason init_waitqueue_head(&cur_trans->commit_wait); 11379154b1bSChris Mason cur_trans->in_commit = 0; 114f9295749SChris Mason cur_trans->blocked = 0; 115a4abeea4SJosef Bacik /* 116a4abeea4SJosef Bacik * One for this trans handle, one so it will live on until we 117a4abeea4SJosef Bacik * commit the transaction. 118a4abeea4SJosef Bacik */ 119a4abeea4SJosef Bacik atomic_set(&cur_trans->use_count, 2); 12079154b1bSChris Mason cur_trans->commit_done = 0; 12108607c1bSChris Mason cur_trans->start_time = get_seconds(); 12256bec294SChris Mason 1236bef4d31SEric Paris cur_trans->delayed_refs.root = RB_ROOT; 12456bec294SChris Mason cur_trans->delayed_refs.num_entries = 0; 125c3e69d58SChris Mason cur_trans->delayed_refs.num_heads_ready = 0; 126c3e69d58SChris Mason cur_trans->delayed_refs.num_heads = 0; 12756bec294SChris Mason cur_trans->delayed_refs.flushing = 0; 128c3e69d58SChris Mason cur_trans->delayed_refs.run_delayed_start = 0; 12900f04b88SArne Jansen cur_trans->delayed_refs.seq = 1; 13020b297d6SJan Schmidt 13120b297d6SJan Schmidt /* 13220b297d6SJan Schmidt * although the tree mod log is per file system and not per transaction, 13320b297d6SJan Schmidt * the log must never go across transaction boundaries. 13420b297d6SJan Schmidt */ 13520b297d6SJan Schmidt smp_mb(); 13620b297d6SJan Schmidt if (!list_empty(&fs_info->tree_mod_seq_list)) { 13720b297d6SJan Schmidt printk(KERN_ERR "btrfs: tree_mod_seq_list not empty when " 13820b297d6SJan Schmidt "creating a fresh transaction\n"); 13920b297d6SJan Schmidt WARN_ON(1); 14020b297d6SJan Schmidt } 14120b297d6SJan Schmidt if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) { 14220b297d6SJan Schmidt printk(KERN_ERR "btrfs: tree_mod_log rb tree not empty when " 14320b297d6SJan Schmidt "creating a fresh transaction\n"); 14420b297d6SJan Schmidt WARN_ON(1); 14520b297d6SJan Schmidt } 14620b297d6SJan Schmidt atomic_set(&fs_info->tree_mod_seq, 0); 14720b297d6SJan Schmidt 148a168650cSJan Schmidt init_waitqueue_head(&cur_trans->delayed_refs.seq_wait); 149a4abeea4SJosef Bacik spin_lock_init(&cur_trans->commit_lock); 15056bec294SChris Mason spin_lock_init(&cur_trans->delayed_refs.lock); 15100f04b88SArne Jansen INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head); 15256bec294SChris Mason 1533063d29fSChris Mason INIT_LIST_HEAD(&cur_trans->pending_snapshots); 15419ae4e81SJan Schmidt list_add_tail(&cur_trans->list, &fs_info->trans_list); 155d1310b2eSChris Mason extent_io_tree_init(&cur_trans->dirty_pages, 15619ae4e81SJan Schmidt fs_info->btree_inode->i_mapping); 15719ae4e81SJan Schmidt fs_info->generation++; 15819ae4e81SJan Schmidt cur_trans->transid = fs_info->generation; 15919ae4e81SJan Schmidt fs_info->running_transaction = cur_trans; 16049b25e05SJeff Mahoney cur_trans->aborted = 0; 16119ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 16215ee9bc7SJosef Bacik 16379154b1bSChris Mason return 0; 16479154b1bSChris Mason } 16579154b1bSChris Mason 166d352ac68SChris Mason /* 167d397712bSChris Mason * this does all the record keeping required to make sure that a reference 168d397712bSChris Mason * counted root is properly recorded in a given transaction. This is required 169d397712bSChris Mason * to make sure the old root from before we joined the transaction is deleted 170d397712bSChris Mason * when the transaction commits 171d352ac68SChris Mason */ 1727585717fSChris Mason static int record_root_in_trans(struct btrfs_trans_handle *trans, 1735d4f98a2SYan Zheng struct btrfs_root *root) 1746702ed49SChris Mason { 1755d4f98a2SYan Zheng if (root->ref_cows && root->last_trans < trans->transid) { 1766702ed49SChris Mason WARN_ON(root == root->fs_info->extent_root); 1775d4f98a2SYan Zheng WARN_ON(root->commit_root != root->node); 1785d4f98a2SYan Zheng 1797585717fSChris Mason /* 1807585717fSChris Mason * see below for in_trans_setup usage rules 1817585717fSChris Mason * we have the reloc mutex held now, so there 1827585717fSChris Mason * is only one writer in this function 1837585717fSChris Mason */ 1847585717fSChris Mason root->in_trans_setup = 1; 1857585717fSChris Mason 1867585717fSChris Mason /* make sure readers find in_trans_setup before 1877585717fSChris Mason * they find our root->last_trans update 1887585717fSChris Mason */ 1897585717fSChris Mason smp_wmb(); 1907585717fSChris Mason 191a4abeea4SJosef Bacik spin_lock(&root->fs_info->fs_roots_radix_lock); 192a4abeea4SJosef Bacik if (root->last_trans == trans->transid) { 193a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 194a4abeea4SJosef Bacik return 0; 195a4abeea4SJosef Bacik } 1966702ed49SChris Mason radix_tree_tag_set(&root->fs_info->fs_roots_radix, 1976702ed49SChris Mason (unsigned long)root->root_key.objectid, 1986702ed49SChris Mason BTRFS_ROOT_TRANS_TAG); 199a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 2007585717fSChris Mason root->last_trans = trans->transid; 2017585717fSChris Mason 2027585717fSChris Mason /* this is pretty tricky. We don't want to 2037585717fSChris Mason * take the relocation lock in btrfs_record_root_in_trans 2047585717fSChris Mason * unless we're really doing the first setup for this root in 2057585717fSChris Mason * this transaction. 2067585717fSChris Mason * 2077585717fSChris Mason * Normally we'd use root->last_trans as a flag to decide 2087585717fSChris Mason * if we want to take the expensive mutex. 2097585717fSChris Mason * 2107585717fSChris Mason * But, we have to set root->last_trans before we 2117585717fSChris Mason * init the relocation root, otherwise, we trip over warnings 2127585717fSChris Mason * in ctree.c. The solution used here is to flag ourselves 2137585717fSChris Mason * with root->in_trans_setup. When this is 1, we're still 2147585717fSChris Mason * fixing up the reloc trees and everyone must wait. 2157585717fSChris Mason * 2167585717fSChris Mason * When this is zero, they can trust root->last_trans and fly 2177585717fSChris Mason * through btrfs_record_root_in_trans without having to take the 2187585717fSChris Mason * lock. smp_wmb() makes sure that all the writes above are 2197585717fSChris Mason * done before we pop in the zero below 2207585717fSChris Mason */ 2215d4f98a2SYan Zheng btrfs_init_reloc_root(trans, root); 2227585717fSChris Mason smp_wmb(); 2237585717fSChris Mason root->in_trans_setup = 0; 2246702ed49SChris Mason } 2255d4f98a2SYan Zheng return 0; 2266702ed49SChris Mason } 2275d4f98a2SYan Zheng 2287585717fSChris Mason 2297585717fSChris Mason int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 2307585717fSChris Mason struct btrfs_root *root) 2317585717fSChris Mason { 2327585717fSChris Mason if (!root->ref_cows) 2337585717fSChris Mason return 0; 2347585717fSChris Mason 2357585717fSChris Mason /* 2367585717fSChris Mason * see record_root_in_trans for comments about in_trans_setup usage 2377585717fSChris Mason * and barriers 2387585717fSChris Mason */ 2397585717fSChris Mason smp_rmb(); 2407585717fSChris Mason if (root->last_trans == trans->transid && 2417585717fSChris Mason !root->in_trans_setup) 2427585717fSChris Mason return 0; 2437585717fSChris Mason 2447585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 2457585717fSChris Mason record_root_in_trans(trans, root); 2467585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 2477585717fSChris Mason 2487585717fSChris Mason return 0; 2497585717fSChris Mason } 2507585717fSChris Mason 251d352ac68SChris Mason /* wait for commit against the current transaction to become unblocked 252d352ac68SChris Mason * when this is done, it is safe to start a new transaction, but the current 253d352ac68SChris Mason * transaction might not be fully on disk. 254d352ac68SChris Mason */ 25537d1aeeeSChris Mason static void wait_current_trans(struct btrfs_root *root) 25679154b1bSChris Mason { 257f9295749SChris Mason struct btrfs_transaction *cur_trans; 25879154b1bSChris Mason 259a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 260f9295749SChris Mason cur_trans = root->fs_info->running_transaction; 26137d1aeeeSChris Mason if (cur_trans && cur_trans->blocked) { 26213c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 263a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 26472d63ed6SLi Zefan 26572d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 26672d63ed6SLi Zefan !cur_trans->blocked); 267f9295749SChris Mason put_transaction(cur_trans); 268a4abeea4SJosef Bacik } else { 269a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 270f9295749SChris Mason } 27137d1aeeeSChris Mason } 27237d1aeeeSChris Mason 273249ac1e5SJosef Bacik enum btrfs_trans_type { 274249ac1e5SJosef Bacik TRANS_START, 275249ac1e5SJosef Bacik TRANS_JOIN, 276249ac1e5SJosef Bacik TRANS_USERSPACE, 2770af3d00bSJosef Bacik TRANS_JOIN_NOLOCK, 278249ac1e5SJosef Bacik }; 279249ac1e5SJosef Bacik 280a22285a6SYan, Zheng static int may_wait_transaction(struct btrfs_root *root, int type) 28137d1aeeeSChris Mason { 282a4abeea4SJosef Bacik if (root->fs_info->log_root_recovering) 283a4abeea4SJosef Bacik return 0; 284a4abeea4SJosef Bacik 285a4abeea4SJosef Bacik if (type == TRANS_USERSPACE) 286a22285a6SYan, Zheng return 1; 287a4abeea4SJosef Bacik 288a4abeea4SJosef Bacik if (type == TRANS_START && 289a4abeea4SJosef Bacik !atomic_read(&root->fs_info->open_ioctl_trans)) 290a4abeea4SJosef Bacik return 1; 291a4abeea4SJosef Bacik 292a22285a6SYan, Zheng return 0; 293a22285a6SYan, Zheng } 294a22285a6SYan, Zheng 295a22285a6SYan, Zheng static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, 296a22285a6SYan, Zheng u64 num_items, int type) 297a22285a6SYan, Zheng { 298a22285a6SYan, Zheng struct btrfs_trans_handle *h; 299a22285a6SYan, Zheng struct btrfs_transaction *cur_trans; 300b5009945SJosef Bacik u64 num_bytes = 0; 301a22285a6SYan, Zheng int ret; 302acce952bSliubo 303acce952bSliubo if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) 304acce952bSliubo return ERR_PTR(-EROFS); 3052a1eb461SJosef Bacik 3062a1eb461SJosef Bacik if (current->journal_info) { 3072a1eb461SJosef Bacik WARN_ON(type != TRANS_JOIN && type != TRANS_JOIN_NOLOCK); 3082a1eb461SJosef Bacik h = current->journal_info; 3092a1eb461SJosef Bacik h->use_count++; 3102a1eb461SJosef Bacik h->orig_rsv = h->block_rsv; 3112a1eb461SJosef Bacik h->block_rsv = NULL; 3122a1eb461SJosef Bacik goto got_it; 3132a1eb461SJosef Bacik } 314b5009945SJosef Bacik 315b5009945SJosef Bacik /* 316b5009945SJosef Bacik * Do the reservation before we join the transaction so we can do all 317b5009945SJosef Bacik * the appropriate flushing if need be. 318b5009945SJosef Bacik */ 319b5009945SJosef Bacik if (num_items > 0 && root != root->fs_info->chunk_root) { 320b5009945SJosef Bacik num_bytes = btrfs_calc_trans_metadata_size(root, num_items); 3214a92b1b8SJosef Bacik ret = btrfs_block_rsv_add(root, 322b5009945SJosef Bacik &root->fs_info->trans_block_rsv, 323b5009945SJosef Bacik num_bytes); 324b5009945SJosef Bacik if (ret) 325b5009945SJosef Bacik return ERR_PTR(ret); 326b5009945SJosef Bacik } 327a22285a6SYan, Zheng again: 328a22285a6SYan, Zheng h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); 329a22285a6SYan, Zheng if (!h) 330a22285a6SYan, Zheng return ERR_PTR(-ENOMEM); 331a22285a6SYan, Zheng 332b2b5ef5cSJan Kara sb_start_intwrite(root->fs_info->sb); 333b2b5ef5cSJan Kara 334a22285a6SYan, Zheng if (may_wait_transaction(root, type)) 33537d1aeeeSChris Mason wait_current_trans(root); 336a22285a6SYan, Zheng 337a4abeea4SJosef Bacik do { 338a4abeea4SJosef Bacik ret = join_transaction(root, type == TRANS_JOIN_NOLOCK); 339a4abeea4SJosef Bacik if (ret == -EBUSY) 340a4abeea4SJosef Bacik wait_current_trans(root); 341a4abeea4SJosef Bacik } while (ret == -EBUSY); 342a4abeea4SJosef Bacik 343db5b493aSTsutomu Itoh if (ret < 0) { 344b2b5ef5cSJan Kara sb_end_intwrite(root->fs_info->sb); 3456e8df2aeSYoshinori Sano kmem_cache_free(btrfs_trans_handle_cachep, h); 346db5b493aSTsutomu Itoh return ERR_PTR(ret); 347db5b493aSTsutomu Itoh } 3480f7d52f4SChris Mason 349a22285a6SYan, Zheng cur_trans = root->fs_info->running_transaction; 350a22285a6SYan, Zheng 351a22285a6SYan, Zheng h->transid = cur_trans->transid; 352a22285a6SYan, Zheng h->transaction = cur_trans; 35379154b1bSChris Mason h->blocks_used = 0; 354a22285a6SYan, Zheng h->bytes_reserved = 0; 35556bec294SChris Mason h->delayed_ref_updates = 0; 3562a1eb461SJosef Bacik h->use_count = 1; 357f0486c68SYan, Zheng h->block_rsv = NULL; 3582a1eb461SJosef Bacik h->orig_rsv = NULL; 35949b25e05SJeff Mahoney h->aborted = 0; 360b7ec40d7SChris Mason 361a22285a6SYan, Zheng smp_mb(); 362a22285a6SYan, Zheng if (cur_trans->blocked && may_wait_transaction(root, type)) { 363a22285a6SYan, Zheng btrfs_commit_transaction(h, root); 364a22285a6SYan, Zheng goto again; 365a22285a6SYan, Zheng } 3669ed74f2dSJosef Bacik 367b5009945SJosef Bacik if (num_bytes) { 3688c2a3ca2SJosef Bacik trace_btrfs_space_reservation(root->fs_info, "transaction", 3692bcc0328SLiu Bo h->transid, num_bytes, 1); 370b5009945SJosef Bacik h->block_rsv = &root->fs_info->trans_block_rsv; 371b5009945SJosef Bacik h->bytes_reserved = num_bytes; 372a22285a6SYan, Zheng } 373a22285a6SYan, Zheng 3742a1eb461SJosef Bacik got_it: 375a4abeea4SJosef Bacik btrfs_record_root_in_trans(h, root); 376a22285a6SYan, Zheng 377a22285a6SYan, Zheng if (!current->journal_info && type != TRANS_USERSPACE) 378a22285a6SYan, Zheng current->journal_info = h; 37979154b1bSChris Mason return h; 38079154b1bSChris Mason } 38179154b1bSChris Mason 382f9295749SChris Mason struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 383a22285a6SYan, Zheng int num_items) 384f9295749SChris Mason { 385a22285a6SYan, Zheng return start_transaction(root, num_items, TRANS_START); 386f9295749SChris Mason } 3877a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) 388f9295749SChris Mason { 389a22285a6SYan, Zheng return start_transaction(root, 0, TRANS_JOIN); 390f9295749SChris Mason } 391f9295749SChris Mason 3927a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) 3930af3d00bSJosef Bacik { 3940af3d00bSJosef Bacik return start_transaction(root, 0, TRANS_JOIN_NOLOCK); 3950af3d00bSJosef Bacik } 3960af3d00bSJosef Bacik 3977a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) 3989ca9ee09SSage Weil { 3997a7eaa40SJosef Bacik return start_transaction(root, 0, TRANS_USERSPACE); 4009ca9ee09SSage Weil } 4019ca9ee09SSage Weil 402d352ac68SChris Mason /* wait for a transaction commit to be fully complete */ 403b9c8300cSLi Zefan static noinline void wait_for_commit(struct btrfs_root *root, 40489ce8a63SChris Mason struct btrfs_transaction *commit) 40589ce8a63SChris Mason { 40672d63ed6SLi Zefan wait_event(commit->commit_wait, commit->commit_done); 40789ce8a63SChris Mason } 40889ce8a63SChris Mason 40946204592SSage Weil int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) 41046204592SSage Weil { 41146204592SSage Weil struct btrfs_transaction *cur_trans = NULL, *t; 41246204592SSage Weil int ret; 41346204592SSage Weil 41446204592SSage Weil ret = 0; 41546204592SSage Weil if (transid) { 41646204592SSage Weil if (transid <= root->fs_info->last_trans_committed) 417a4abeea4SJosef Bacik goto out; 41846204592SSage Weil 41946204592SSage Weil /* find specified transaction */ 420a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 42146204592SSage Weil list_for_each_entry(t, &root->fs_info->trans_list, list) { 42246204592SSage Weil if (t->transid == transid) { 42346204592SSage Weil cur_trans = t; 424a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 42546204592SSage Weil break; 42646204592SSage Weil } 42746204592SSage Weil if (t->transid > transid) 42846204592SSage Weil break; 42946204592SSage Weil } 430a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 43146204592SSage Weil ret = -EINVAL; 43246204592SSage Weil if (!cur_trans) 433a4abeea4SJosef Bacik goto out; /* bad transid */ 43446204592SSage Weil } else { 43546204592SSage Weil /* find newest transaction that is committing | committed */ 436a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 43746204592SSage Weil list_for_each_entry_reverse(t, &root->fs_info->trans_list, 43846204592SSage Weil list) { 43946204592SSage Weil if (t->in_commit) { 44046204592SSage Weil if (t->commit_done) 4413473f3c0SJosef Bacik break; 44246204592SSage Weil cur_trans = t; 443a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 44446204592SSage Weil break; 44546204592SSage Weil } 44646204592SSage Weil } 447a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 44846204592SSage Weil if (!cur_trans) 449a4abeea4SJosef Bacik goto out; /* nothing committing|committed */ 45046204592SSage Weil } 45146204592SSage Weil 45246204592SSage Weil wait_for_commit(root, cur_trans); 45346204592SSage Weil 45446204592SSage Weil put_transaction(cur_trans); 45546204592SSage Weil ret = 0; 456a4abeea4SJosef Bacik out: 45746204592SSage Weil return ret; 45846204592SSage Weil } 45946204592SSage Weil 46037d1aeeeSChris Mason void btrfs_throttle(struct btrfs_root *root) 46137d1aeeeSChris Mason { 462a4abeea4SJosef Bacik if (!atomic_read(&root->fs_info->open_ioctl_trans)) 46337d1aeeeSChris Mason wait_current_trans(root); 46437d1aeeeSChris Mason } 46537d1aeeeSChris Mason 4668929ecfaSYan, Zheng static int should_end_transaction(struct btrfs_trans_handle *trans, 4678929ecfaSYan, Zheng struct btrfs_root *root) 4688929ecfaSYan, Zheng { 4698929ecfaSYan, Zheng int ret; 47036ba022aSJosef Bacik 47136ba022aSJosef Bacik ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); 4728929ecfaSYan, Zheng return ret ? 1 : 0; 4738929ecfaSYan, Zheng } 4748929ecfaSYan, Zheng 4758929ecfaSYan, Zheng int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 4768929ecfaSYan, Zheng struct btrfs_root *root) 4778929ecfaSYan, Zheng { 4788929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 4799c8d86dbSJosef Bacik struct btrfs_block_rsv *rsv = trans->block_rsv; 4808929ecfaSYan, Zheng int updates; 48149b25e05SJeff Mahoney int err; 4828929ecfaSYan, Zheng 483a4abeea4SJosef Bacik smp_mb(); 4848929ecfaSYan, Zheng if (cur_trans->blocked || cur_trans->delayed_refs.flushing) 4858929ecfaSYan, Zheng return 1; 4868929ecfaSYan, Zheng 4879c8d86dbSJosef Bacik /* 4889c8d86dbSJosef Bacik * We need to do this in case we're deleting csums so the global block 4899c8d86dbSJosef Bacik * rsv get's used instead of the csum block rsv. 4909c8d86dbSJosef Bacik */ 4919c8d86dbSJosef Bacik trans->block_rsv = NULL; 4929c8d86dbSJosef Bacik 4938929ecfaSYan, Zheng updates = trans->delayed_ref_updates; 4948929ecfaSYan, Zheng trans->delayed_ref_updates = 0; 49549b25e05SJeff Mahoney if (updates) { 49649b25e05SJeff Mahoney err = btrfs_run_delayed_refs(trans, root, updates); 49749b25e05SJeff Mahoney if (err) /* Error code will also eval true */ 49849b25e05SJeff Mahoney return err; 49949b25e05SJeff Mahoney } 5008929ecfaSYan, Zheng 5019c8d86dbSJosef Bacik trans->block_rsv = rsv; 5029c8d86dbSJosef Bacik 5038929ecfaSYan, Zheng return should_end_transaction(trans, root); 5048929ecfaSYan, Zheng } 5058929ecfaSYan, Zheng 50689ce8a63SChris Mason static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, 5070af3d00bSJosef Bacik struct btrfs_root *root, int throttle, int lock) 50879154b1bSChris Mason { 5098929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 510ab78c84dSChris Mason struct btrfs_fs_info *info = root->fs_info; 511c3e69d58SChris Mason int count = 0; 5124edc2ca3SDave Jones int err = 0; 513d6e4a428SChris Mason 5142a1eb461SJosef Bacik if (--trans->use_count) { 5152a1eb461SJosef Bacik trans->block_rsv = trans->orig_rsv; 5162a1eb461SJosef Bacik return 0; 5172a1eb461SJosef Bacik } 5182a1eb461SJosef Bacik 519b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 5204c13d758SJosef Bacik trans->block_rsv = NULL; 521203bf287SChris Mason while (count < 2) { 522c3e69d58SChris Mason unsigned long cur = trans->delayed_ref_updates; 523c3e69d58SChris Mason trans->delayed_ref_updates = 0; 524c3e69d58SChris Mason if (cur && 525c3e69d58SChris Mason trans->transaction->delayed_refs.num_heads_ready > 64) { 526c3e69d58SChris Mason trans->delayed_ref_updates = 0; 527c3e69d58SChris Mason btrfs_run_delayed_refs(trans, root, cur); 528c3e69d58SChris Mason } else { 529c3e69d58SChris Mason break; 530c3e69d58SChris Mason } 531c3e69d58SChris Mason count++; 53256bec294SChris Mason } 53356bec294SChris Mason 534b2b5ef5cSJan Kara sb_end_intwrite(root->fs_info->sb); 535b2b5ef5cSJan Kara 536a4abeea4SJosef Bacik if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && 537a4abeea4SJosef Bacik should_end_transaction(trans, root)) { 5388929ecfaSYan, Zheng trans->transaction->blocked = 1; 539a4abeea4SJosef Bacik smp_wmb(); 540a4abeea4SJosef Bacik } 5418929ecfaSYan, Zheng 5420af3d00bSJosef Bacik if (lock && cur_trans->blocked && !cur_trans->in_commit) { 54381317fdeSJosef Bacik if (throttle) { 54481317fdeSJosef Bacik /* 54581317fdeSJosef Bacik * We may race with somebody else here so end up having 54681317fdeSJosef Bacik * to call end_transaction on ourselves again, so inc 54781317fdeSJosef Bacik * our use_count. 54881317fdeSJosef Bacik */ 54981317fdeSJosef Bacik trans->use_count++; 5508929ecfaSYan, Zheng return btrfs_commit_transaction(trans, root); 55181317fdeSJosef Bacik } else { 5528929ecfaSYan, Zheng wake_up_process(info->transaction_kthread); 5538929ecfaSYan, Zheng } 55481317fdeSJosef Bacik } 5558929ecfaSYan, Zheng 5568929ecfaSYan, Zheng WARN_ON(cur_trans != info->running_transaction); 55713c5a93eSJosef Bacik WARN_ON(atomic_read(&cur_trans->num_writers) < 1); 55813c5a93eSJosef Bacik atomic_dec(&cur_trans->num_writers); 55989ce8a63SChris Mason 56099d16cbcSSage Weil smp_mb(); 56179154b1bSChris Mason if (waitqueue_active(&cur_trans->writer_wait)) 56279154b1bSChris Mason wake_up(&cur_trans->writer_wait); 56379154b1bSChris Mason put_transaction(cur_trans); 5649ed74f2dSJosef Bacik 5659ed74f2dSJosef Bacik if (current->journal_info == trans) 5669ed74f2dSJosef Bacik current->journal_info = NULL; 567ab78c84dSChris Mason 56824bbcf04SYan, Zheng if (throttle) 56924bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 57024bbcf04SYan, Zheng 57149b25e05SJeff Mahoney if (trans->aborted || 57249b25e05SJeff Mahoney root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 5734edc2ca3SDave Jones err = -EIO; 57449b25e05SJeff Mahoney } 57549b25e05SJeff Mahoney 5764edc2ca3SDave Jones memset(trans, 0, sizeof(*trans)); 5774edc2ca3SDave Jones kmem_cache_free(btrfs_trans_handle_cachep, trans); 5784edc2ca3SDave Jones return err; 57979154b1bSChris Mason } 58079154b1bSChris Mason 58189ce8a63SChris Mason int btrfs_end_transaction(struct btrfs_trans_handle *trans, 58289ce8a63SChris Mason struct btrfs_root *root) 58389ce8a63SChris Mason { 58416cdcec7SMiao Xie int ret; 58516cdcec7SMiao Xie 58616cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 0, 1); 58716cdcec7SMiao Xie if (ret) 58816cdcec7SMiao Xie return ret; 58916cdcec7SMiao Xie return 0; 59089ce8a63SChris Mason } 59189ce8a63SChris Mason 59289ce8a63SChris Mason int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 59389ce8a63SChris Mason struct btrfs_root *root) 59489ce8a63SChris Mason { 59516cdcec7SMiao Xie int ret; 59616cdcec7SMiao Xie 59716cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 1, 1); 59816cdcec7SMiao Xie if (ret) 59916cdcec7SMiao Xie return ret; 60016cdcec7SMiao Xie return 0; 6010af3d00bSJosef Bacik } 6020af3d00bSJosef Bacik 6030af3d00bSJosef Bacik int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, 6040af3d00bSJosef Bacik struct btrfs_root *root) 6050af3d00bSJosef Bacik { 60616cdcec7SMiao Xie int ret; 60716cdcec7SMiao Xie 60816cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 0, 0); 60916cdcec7SMiao Xie if (ret) 61016cdcec7SMiao Xie return ret; 61116cdcec7SMiao Xie return 0; 61216cdcec7SMiao Xie } 61316cdcec7SMiao Xie 61416cdcec7SMiao Xie int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans, 61516cdcec7SMiao Xie struct btrfs_root *root) 61616cdcec7SMiao Xie { 61716cdcec7SMiao Xie return __btrfs_end_transaction(trans, root, 1, 1); 61889ce8a63SChris Mason } 61989ce8a63SChris Mason 620d352ac68SChris Mason /* 621d352ac68SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 622d352ac68SChris Mason * them in one of two extent_io trees. This is used to make sure all of 623690587d1SChris Mason * those extents are sent to disk but does not wait on them 624d352ac68SChris Mason */ 625690587d1SChris Mason int btrfs_write_marked_extents(struct btrfs_root *root, 6268cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 62779154b1bSChris Mason { 628777e6bd7SChris Mason int err = 0; 6297c4452b9SChris Mason int werr = 0; 6301728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 631777e6bd7SChris Mason u64 start = 0; 6325f39d397SChris Mason u64 end; 6337c4452b9SChris Mason 6341728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 6351728366eSJosef Bacik mark)) { 6361728366eSJosef Bacik convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, mark, 6371728366eSJosef Bacik GFP_NOFS); 6381728366eSJosef Bacik err = filemap_fdatawrite_range(mapping, start, end); 6397c4452b9SChris Mason if (err) 6407c4452b9SChris Mason werr = err; 6411728366eSJosef Bacik cond_resched(); 6421728366eSJosef Bacik start = end + 1; 6437c4452b9SChris Mason } 644690587d1SChris Mason if (err) 645690587d1SChris Mason werr = err; 646690587d1SChris Mason return werr; 647690587d1SChris Mason } 648690587d1SChris Mason 649690587d1SChris Mason /* 650690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 651690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 652690587d1SChris Mason * those extents are on disk for transaction or log commit. We wait 653690587d1SChris Mason * on all the pages and clear them from the dirty pages state tree 654690587d1SChris Mason */ 655690587d1SChris Mason int btrfs_wait_marked_extents(struct btrfs_root *root, 6568cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 657690587d1SChris Mason { 658690587d1SChris Mason int err = 0; 659690587d1SChris Mason int werr = 0; 6601728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 661690587d1SChris Mason u64 start = 0; 662690587d1SChris Mason u64 end; 663690587d1SChris Mason 6641728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 6651728366eSJosef Bacik EXTENT_NEED_WAIT)) { 6661728366eSJosef Bacik clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS); 6671728366eSJosef Bacik err = filemap_fdatawait_range(mapping, start, end); 668777e6bd7SChris Mason if (err) 669777e6bd7SChris Mason werr = err; 670777e6bd7SChris Mason cond_resched(); 6711728366eSJosef Bacik start = end + 1; 672777e6bd7SChris Mason } 6737c4452b9SChris Mason if (err) 6747c4452b9SChris Mason werr = err; 6757c4452b9SChris Mason return werr; 67679154b1bSChris Mason } 67779154b1bSChris Mason 678690587d1SChris Mason /* 679690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 680690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 681690587d1SChris Mason * those extents are on disk for transaction or log commit 682690587d1SChris Mason */ 683690587d1SChris Mason int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, 6848cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 685690587d1SChris Mason { 686690587d1SChris Mason int ret; 687690587d1SChris Mason int ret2; 688690587d1SChris Mason 6898cef4e16SYan, Zheng ret = btrfs_write_marked_extents(root, dirty_pages, mark); 6908cef4e16SYan, Zheng ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); 691bf0da8c1SChris Mason 692bf0da8c1SChris Mason if (ret) 693bf0da8c1SChris Mason return ret; 694bf0da8c1SChris Mason if (ret2) 695bf0da8c1SChris Mason return ret2; 696bf0da8c1SChris Mason return 0; 697690587d1SChris Mason } 698690587d1SChris Mason 699d0c803c4SChris Mason int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, 700d0c803c4SChris Mason struct btrfs_root *root) 701d0c803c4SChris Mason { 702d0c803c4SChris Mason if (!trans || !trans->transaction) { 703d0c803c4SChris Mason struct inode *btree_inode; 704d0c803c4SChris Mason btree_inode = root->fs_info->btree_inode; 705d0c803c4SChris Mason return filemap_write_and_wait(btree_inode->i_mapping); 706d0c803c4SChris Mason } 707d0c803c4SChris Mason return btrfs_write_and_wait_marked_extents(root, 7088cef4e16SYan, Zheng &trans->transaction->dirty_pages, 7098cef4e16SYan, Zheng EXTENT_DIRTY); 710d0c803c4SChris Mason } 711d0c803c4SChris Mason 712d352ac68SChris Mason /* 713d352ac68SChris Mason * this is used to update the root pointer in the tree of tree roots. 714d352ac68SChris Mason * 715d352ac68SChris Mason * But, in the case of the extent allocation tree, updating the root 716d352ac68SChris Mason * pointer may allocate blocks which may change the root of the extent 717d352ac68SChris Mason * allocation tree. 718d352ac68SChris Mason * 719d352ac68SChris Mason * So, this loops and repeats and makes sure the cowonly root didn't 720d352ac68SChris Mason * change while the root pointer was being updated in the metadata. 721d352ac68SChris Mason */ 7220b86a832SChris Mason static int update_cowonly_root(struct btrfs_trans_handle *trans, 72379154b1bSChris Mason struct btrfs_root *root) 72479154b1bSChris Mason { 72579154b1bSChris Mason int ret; 7260b86a832SChris Mason u64 old_root_bytenr; 72786b9f2ecSYan, Zheng u64 old_root_used; 7280b86a832SChris Mason struct btrfs_root *tree_root = root->fs_info->tree_root; 72979154b1bSChris Mason 73086b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 7310b86a832SChris Mason btrfs_write_dirty_block_groups(trans, root); 73256bec294SChris Mason 73379154b1bSChris Mason while (1) { 7340b86a832SChris Mason old_root_bytenr = btrfs_root_bytenr(&root->root_item); 73586b9f2ecSYan, Zheng if (old_root_bytenr == root->node->start && 73686b9f2ecSYan, Zheng old_root_used == btrfs_root_used(&root->root_item)) 73779154b1bSChris Mason break; 73887ef2bb4SChris Mason 7395d4f98a2SYan Zheng btrfs_set_root_node(&root->root_item, root->node); 74079154b1bSChris Mason ret = btrfs_update_root(trans, tree_root, 7410b86a832SChris Mason &root->root_key, 7420b86a832SChris Mason &root->root_item); 74349b25e05SJeff Mahoney if (ret) 74449b25e05SJeff Mahoney return ret; 74556bec294SChris Mason 74686b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 7474a8c9a62SYan Zheng ret = btrfs_write_dirty_block_groups(trans, root); 74849b25e05SJeff Mahoney if (ret) 74949b25e05SJeff Mahoney return ret; 7500b86a832SChris Mason } 751276e680dSYan Zheng 752276e680dSYan Zheng if (root != root->fs_info->extent_root) 753817d52f8SJosef Bacik switch_commit_root(root); 754276e680dSYan Zheng 7550b86a832SChris Mason return 0; 7560b86a832SChris Mason } 7570b86a832SChris Mason 758d352ac68SChris Mason /* 759d352ac68SChris Mason * update all the cowonly tree roots on disk 76049b25e05SJeff Mahoney * 76149b25e05SJeff Mahoney * The error handling in this function may not be obvious. Any of the 76249b25e05SJeff Mahoney * failures will cause the file system to go offline. We still need 76349b25e05SJeff Mahoney * to clean up the delayed refs. 764d352ac68SChris Mason */ 7655d4f98a2SYan Zheng static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, 7660b86a832SChris Mason struct btrfs_root *root) 7670b86a832SChris Mason { 7680b86a832SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 7690b86a832SChris Mason struct list_head *next; 77084234f3aSYan Zheng struct extent_buffer *eb; 77156bec294SChris Mason int ret; 77284234f3aSYan Zheng 77356bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 77449b25e05SJeff Mahoney if (ret) 77549b25e05SJeff Mahoney return ret; 77687ef2bb4SChris Mason 77784234f3aSYan Zheng eb = btrfs_lock_root_node(fs_info->tree_root); 77849b25e05SJeff Mahoney ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 77949b25e05SJeff Mahoney 0, &eb); 78084234f3aSYan Zheng btrfs_tree_unlock(eb); 78184234f3aSYan Zheng free_extent_buffer(eb); 7820b86a832SChris Mason 78349b25e05SJeff Mahoney if (ret) 78449b25e05SJeff Mahoney return ret; 78549b25e05SJeff Mahoney 78656bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 78749b25e05SJeff Mahoney if (ret) 78849b25e05SJeff Mahoney return ret; 78987ef2bb4SChris Mason 790733f4fbbSStefan Behrens ret = btrfs_run_dev_stats(trans, root->fs_info); 791733f4fbbSStefan Behrens BUG_ON(ret); 792733f4fbbSStefan Behrens 7930b86a832SChris Mason while (!list_empty(&fs_info->dirty_cowonly_roots)) { 7940b86a832SChris Mason next = fs_info->dirty_cowonly_roots.next; 7950b86a832SChris Mason list_del_init(next); 7960b86a832SChris Mason root = list_entry(next, struct btrfs_root, dirty_list); 79787ef2bb4SChris Mason 79849b25e05SJeff Mahoney ret = update_cowonly_root(trans, root); 79949b25e05SJeff Mahoney if (ret) 80049b25e05SJeff Mahoney return ret; 80179154b1bSChris Mason } 802276e680dSYan Zheng 803276e680dSYan Zheng down_write(&fs_info->extent_commit_sem); 804276e680dSYan Zheng switch_commit_root(fs_info->extent_root); 805276e680dSYan Zheng up_write(&fs_info->extent_commit_sem); 806276e680dSYan Zheng 80779154b1bSChris Mason return 0; 80879154b1bSChris Mason } 80979154b1bSChris Mason 810d352ac68SChris Mason /* 811d352ac68SChris Mason * dead roots are old snapshots that need to be deleted. This allocates 812d352ac68SChris Mason * a dirty root struct and adds it into the list of dead roots that need to 813d352ac68SChris Mason * be deleted 814d352ac68SChris Mason */ 8155d4f98a2SYan Zheng int btrfs_add_dead_root(struct btrfs_root *root) 8165eda7b5eSChris Mason { 817a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 8185d4f98a2SYan Zheng list_add(&root->root_list, &root->fs_info->dead_roots); 819a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 8205eda7b5eSChris Mason return 0; 8215eda7b5eSChris Mason } 8225eda7b5eSChris Mason 823d352ac68SChris Mason /* 8245d4f98a2SYan Zheng * update all the cowonly tree roots on disk 825d352ac68SChris Mason */ 8265d4f98a2SYan Zheng static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, 8275d4f98a2SYan Zheng struct btrfs_root *root) 8280f7d52f4SChris Mason { 8290f7d52f4SChris Mason struct btrfs_root *gang[8]; 8305d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 8310f7d52f4SChris Mason int i; 8320f7d52f4SChris Mason int ret; 83354aa1f4dSChris Mason int err = 0; 83454aa1f4dSChris Mason 835a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 8360f7d52f4SChris Mason while (1) { 8375d4f98a2SYan Zheng ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, 8385d4f98a2SYan Zheng (void **)gang, 0, 8390f7d52f4SChris Mason ARRAY_SIZE(gang), 8400f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 8410f7d52f4SChris Mason if (ret == 0) 8420f7d52f4SChris Mason break; 8430f7d52f4SChris Mason for (i = 0; i < ret; i++) { 8440f7d52f4SChris Mason root = gang[i]; 8455d4f98a2SYan Zheng radix_tree_tag_clear(&fs_info->fs_roots_radix, 8462619ba1fSChris Mason (unsigned long)root->root_key.objectid, 8470f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 848a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 84931153d81SYan Zheng 850e02119d5SChris Mason btrfs_free_log(trans, root); 8515d4f98a2SYan Zheng btrfs_update_reloc_root(trans, root); 852d68fc57bSYan, Zheng btrfs_orphan_commit_root(trans, root); 853e02119d5SChris Mason 85482d5902dSLi Zefan btrfs_save_ino_cache(root, trans); 85582d5902dSLi Zefan 856f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 857f1ebcc74SLiu Bo root->force_cow = 0; 858f1ebcc74SLiu Bo smp_wmb(); 859f1ebcc74SLiu Bo 860978d910dSYan Zheng if (root->commit_root != root->node) { 861581bb050SLi Zefan mutex_lock(&root->fs_commit_mutex); 862817d52f8SJosef Bacik switch_commit_root(root); 863581bb050SLi Zefan btrfs_unpin_free_ino(root); 864581bb050SLi Zefan mutex_unlock(&root->fs_commit_mutex); 865581bb050SLi Zefan 866978d910dSYan Zheng btrfs_set_root_node(&root->root_item, 867978d910dSYan Zheng root->node); 868978d910dSYan Zheng } 86931153d81SYan Zheng 8705d4f98a2SYan Zheng err = btrfs_update_root(trans, fs_info->tree_root, 8710f7d52f4SChris Mason &root->root_key, 8720f7d52f4SChris Mason &root->root_item); 873a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 87454aa1f4dSChris Mason if (err) 87554aa1f4dSChris Mason break; 8760f7d52f4SChris Mason } 8779f3a7427SChris Mason } 878a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 87954aa1f4dSChris Mason return err; 8800f7d52f4SChris Mason } 8810f7d52f4SChris Mason 882d352ac68SChris Mason /* 883d352ac68SChris Mason * defrag a given btree. If cacheonly == 1, this won't read from the disk, 884d352ac68SChris Mason * otherwise every leaf in the btree is read and defragged. 885d352ac68SChris Mason */ 886e9d0b13bSChris Mason int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) 887e9d0b13bSChris Mason { 888e9d0b13bSChris Mason struct btrfs_fs_info *info = root->fs_info; 889e9d0b13bSChris Mason struct btrfs_trans_handle *trans; 8908929ecfaSYan, Zheng int ret; 891d3c2fdcfSChris Mason unsigned long nr; 892e9d0b13bSChris Mason 8938929ecfaSYan, Zheng if (xchg(&root->defrag_running, 1)) 894e9d0b13bSChris Mason return 0; 8958929ecfaSYan, Zheng 8966b80053dSChris Mason while (1) { 8978929ecfaSYan, Zheng trans = btrfs_start_transaction(root, 0); 8988929ecfaSYan, Zheng if (IS_ERR(trans)) 8998929ecfaSYan, Zheng return PTR_ERR(trans); 9008929ecfaSYan, Zheng 901e9d0b13bSChris Mason ret = btrfs_defrag_leaves(trans, root, cacheonly); 9028929ecfaSYan, Zheng 903d3c2fdcfSChris Mason nr = trans->blocks_used; 904e9d0b13bSChris Mason btrfs_end_transaction(trans, root); 905d3c2fdcfSChris Mason btrfs_btree_balance_dirty(info->tree_root, nr); 906e9d0b13bSChris Mason cond_resched(); 907e9d0b13bSChris Mason 9087841cb28SDavid Sterba if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) 909e9d0b13bSChris Mason break; 910e9d0b13bSChris Mason } 911e9d0b13bSChris Mason root->defrag_running = 0; 9128929ecfaSYan, Zheng return ret; 913e9d0b13bSChris Mason } 914e9d0b13bSChris Mason 915d352ac68SChris Mason /* 916d352ac68SChris Mason * new snapshots need to be created at a very specific time in the 917d352ac68SChris Mason * transaction commit. This does the actual creation 918d352ac68SChris Mason */ 91980b6794dSChris Mason static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, 9203063d29fSChris Mason struct btrfs_fs_info *fs_info, 9213063d29fSChris Mason struct btrfs_pending_snapshot *pending) 9223063d29fSChris Mason { 9233063d29fSChris Mason struct btrfs_key key; 92480b6794dSChris Mason struct btrfs_root_item *new_root_item; 9253063d29fSChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 9263063d29fSChris Mason struct btrfs_root *root = pending->root; 9276bdb72deSSage Weil struct btrfs_root *parent_root; 92898c9942aSLiu Bo struct btrfs_block_rsv *rsv; 9296bdb72deSSage Weil struct inode *parent_inode; 9306a912213SJosef Bacik struct dentry *parent; 931a22285a6SYan, Zheng struct dentry *dentry; 9323063d29fSChris Mason struct extent_buffer *tmp; 933925baeddSChris Mason struct extent_buffer *old; 9343063d29fSChris Mason int ret; 935d68fc57bSYan, Zheng u64 to_reserve = 0; 9366bdb72deSSage Weil u64 index = 0; 937a22285a6SYan, Zheng u64 objectid; 938b83cc969SLi Zefan u64 root_flags; 9393063d29fSChris Mason 94098c9942aSLiu Bo rsv = trans->block_rsv; 94198c9942aSLiu Bo 94280b6794dSChris Mason new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); 94380b6794dSChris Mason if (!new_root_item) { 94449b25e05SJeff Mahoney ret = pending->error = -ENOMEM; 94580b6794dSChris Mason goto fail; 94680b6794dSChris Mason } 947a22285a6SYan, Zheng 948581bb050SLi Zefan ret = btrfs_find_free_objectid(tree_root, &objectid); 949a22285a6SYan, Zheng if (ret) { 950a22285a6SYan, Zheng pending->error = ret; 9513063d29fSChris Mason goto fail; 952a22285a6SYan, Zheng } 9533063d29fSChris Mason 9543fd0a558SYan, Zheng btrfs_reloc_pre_snapshot(trans, pending, &to_reserve); 955d68fc57bSYan, Zheng 956d68fc57bSYan, Zheng if (to_reserve > 0) { 95762f30c54SMiao Xie ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv, 9588bb8ab2eSJosef Bacik to_reserve); 959d68fc57bSYan, Zheng if (ret) { 960d68fc57bSYan, Zheng pending->error = ret; 961d68fc57bSYan, Zheng goto fail; 962d68fc57bSYan, Zheng } 963d68fc57bSYan, Zheng } 964d68fc57bSYan, Zheng 9653063d29fSChris Mason key.objectid = objectid; 966a22285a6SYan, Zheng key.offset = (u64)-1; 967a22285a6SYan, Zheng key.type = BTRFS_ROOT_ITEM_KEY; 9683063d29fSChris Mason 969a22285a6SYan, Zheng trans->block_rsv = &pending->block_rsv; 9706bdb72deSSage Weil 971a22285a6SYan, Zheng dentry = pending->dentry; 9726a912213SJosef Bacik parent = dget_parent(dentry); 9736a912213SJosef Bacik parent_inode = parent->d_inode; 974a22285a6SYan, Zheng parent_root = BTRFS_I(parent_inode)->root; 9757585717fSChris Mason record_root_in_trans(trans, parent_root); 976a22285a6SYan, Zheng 9776bdb72deSSage Weil /* 9786bdb72deSSage Weil * insert the directory item 9796bdb72deSSage Weil */ 9806bdb72deSSage Weil ret = btrfs_set_inode_index(parent_inode, &index); 98149b25e05SJeff Mahoney BUG_ON(ret); /* -ENOMEM */ 9826bdb72deSSage Weil ret = btrfs_insert_dir_item(trans, parent_root, 983a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len, 98416cdcec7SMiao Xie parent_inode, &key, 985a22285a6SYan, Zheng BTRFS_FT_DIR, index); 98679787eaaSJeff Mahoney if (ret == -EEXIST) { 987fe66a05aSChris Mason pending->error = -EEXIST; 988fe66a05aSChris Mason dput(parent); 989fe66a05aSChris Mason goto fail; 99079787eaaSJeff Mahoney } else if (ret) { 99179787eaaSJeff Mahoney goto abort_trans_dput; 99279787eaaSJeff Mahoney } 9936bdb72deSSage Weil 994a22285a6SYan, Zheng btrfs_i_size_write(parent_inode, parent_inode->i_size + 995a22285a6SYan, Zheng dentry->d_name.len * 2); 9966bdb72deSSage Weil ret = btrfs_update_inode(trans, parent_root, parent_inode); 99749b25e05SJeff Mahoney if (ret) 99879787eaaSJeff Mahoney goto abort_trans_dput; 9996bdb72deSSage Weil 1000e999376fSChris Mason /* 1001e999376fSChris Mason * pull in the delayed directory update 1002e999376fSChris Mason * and the delayed inode item 1003e999376fSChris Mason * otherwise we corrupt the FS during 1004e999376fSChris Mason * snapshot 1005e999376fSChris Mason */ 1006e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 100779787eaaSJeff Mahoney if (ret) { /* Transaction aborted */ 100879787eaaSJeff Mahoney dput(parent); 100949b25e05SJeff Mahoney goto fail; 101079787eaaSJeff Mahoney } 1011e999376fSChris Mason 10127585717fSChris Mason record_root_in_trans(trans, root); 10136bdb72deSSage Weil btrfs_set_root_last_snapshot(&root->root_item, trans->transid); 10146bdb72deSSage Weil memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); 101508fe4db1SLi Zefan btrfs_check_and_init_root_item(new_root_item); 10166bdb72deSSage Weil 1017b83cc969SLi Zefan root_flags = btrfs_root_flags(new_root_item); 1018b83cc969SLi Zefan if (pending->readonly) 1019b83cc969SLi Zefan root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; 1020b83cc969SLi Zefan else 1021b83cc969SLi Zefan root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; 1022b83cc969SLi Zefan btrfs_set_root_flags(new_root_item, root_flags); 1023b83cc969SLi Zefan 1024925baeddSChris Mason old = btrfs_lock_root_node(root); 102549b25e05SJeff Mahoney ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); 102679787eaaSJeff Mahoney if (ret) { 102779787eaaSJeff Mahoney btrfs_tree_unlock(old); 102879787eaaSJeff Mahoney free_extent_buffer(old); 102979787eaaSJeff Mahoney goto abort_trans_dput; 103079787eaaSJeff Mahoney } 103149b25e05SJeff Mahoney 10325d4f98a2SYan Zheng btrfs_set_lock_blocking(old); 10333063d29fSChris Mason 103449b25e05SJeff Mahoney ret = btrfs_copy_root(trans, root, old, &tmp, objectid); 103579787eaaSJeff Mahoney /* clean up in any case */ 1036925baeddSChris Mason btrfs_tree_unlock(old); 1037925baeddSChris Mason free_extent_buffer(old); 103879787eaaSJeff Mahoney if (ret) 103979787eaaSJeff Mahoney goto abort_trans_dput; 10403063d29fSChris Mason 1041f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 1042f1ebcc74SLiu Bo root->force_cow = 1; 1043f1ebcc74SLiu Bo smp_wmb(); 1044f1ebcc74SLiu Bo 10455d4f98a2SYan Zheng btrfs_set_root_node(new_root_item, tmp); 1046a22285a6SYan, Zheng /* record when the snapshot was created in key.offset */ 1047a22285a6SYan, Zheng key.offset = trans->transid; 1048a22285a6SYan, Zheng ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); 1049925baeddSChris Mason btrfs_tree_unlock(tmp); 10503063d29fSChris Mason free_extent_buffer(tmp); 105149b25e05SJeff Mahoney if (ret) 105279787eaaSJeff Mahoney goto abort_trans_dput; 10530660b5afSChris Mason 1054a22285a6SYan, Zheng /* 1055a22285a6SYan, Zheng * insert root back/forward references 1056a22285a6SYan, Zheng */ 1057a22285a6SYan, Zheng ret = btrfs_add_root_ref(trans, tree_root, objectid, 1058a22285a6SYan, Zheng parent_root->root_key.objectid, 105933345d01SLi Zefan btrfs_ino(parent_inode), index, 1060a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len); 106179787eaaSJeff Mahoney dput(parent); 106249b25e05SJeff Mahoney if (ret) 106349b25e05SJeff Mahoney goto fail; 1064a22285a6SYan, Zheng 1065a22285a6SYan, Zheng key.offset = (u64)-1; 1066a22285a6SYan, Zheng pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); 106779787eaaSJeff Mahoney if (IS_ERR(pending->snap)) { 106879787eaaSJeff Mahoney ret = PTR_ERR(pending->snap); 106949b25e05SJeff Mahoney goto abort_trans; 107079787eaaSJeff Mahoney } 1071d68fc57bSYan, Zheng 107249b25e05SJeff Mahoney ret = btrfs_reloc_post_snapshot(trans, pending); 107349b25e05SJeff Mahoney if (ret) 107449b25e05SJeff Mahoney goto abort_trans; 107549b25e05SJeff Mahoney ret = 0; 10763063d29fSChris Mason fail: 10776bdb72deSSage Weil kfree(new_root_item); 107898c9942aSLiu Bo trans->block_rsv = rsv; 1079a22285a6SYan, Zheng btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1); 108049b25e05SJeff Mahoney return ret; 108149b25e05SJeff Mahoney 108279787eaaSJeff Mahoney abort_trans_dput: 108379787eaaSJeff Mahoney dput(parent); 108449b25e05SJeff Mahoney abort_trans: 108549b25e05SJeff Mahoney btrfs_abort_transaction(trans, root, ret); 108649b25e05SJeff Mahoney goto fail; 10873063d29fSChris Mason } 10883063d29fSChris Mason 1089d352ac68SChris Mason /* 1090d352ac68SChris Mason * create all the snapshots we've scheduled for creation 1091d352ac68SChris Mason */ 109280b6794dSChris Mason static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, 10933063d29fSChris Mason struct btrfs_fs_info *fs_info) 10943063d29fSChris Mason { 10953063d29fSChris Mason struct btrfs_pending_snapshot *pending; 10963063d29fSChris Mason struct list_head *head = &trans->transaction->pending_snapshots; 10973de4586cSChris Mason 1098fe66a05aSChris Mason list_for_each_entry(pending, head, list) 1099fe66a05aSChris Mason create_pending_snapshot(trans, fs_info, pending); 11003de4586cSChris Mason return 0; 11013de4586cSChris Mason } 11023de4586cSChris Mason 11035d4f98a2SYan Zheng static void update_super_roots(struct btrfs_root *root) 11045d4f98a2SYan Zheng { 11055d4f98a2SYan Zheng struct btrfs_root_item *root_item; 11065d4f98a2SYan Zheng struct btrfs_super_block *super; 11075d4f98a2SYan Zheng 11086c41761fSDavid Sterba super = root->fs_info->super_copy; 11095d4f98a2SYan Zheng 11105d4f98a2SYan Zheng root_item = &root->fs_info->chunk_root->root_item; 11115d4f98a2SYan Zheng super->chunk_root = root_item->bytenr; 11125d4f98a2SYan Zheng super->chunk_root_generation = root_item->generation; 11135d4f98a2SYan Zheng super->chunk_root_level = root_item->level; 11145d4f98a2SYan Zheng 11155d4f98a2SYan Zheng root_item = &root->fs_info->tree_root->root_item; 11165d4f98a2SYan Zheng super->root = root_item->bytenr; 11175d4f98a2SYan Zheng super->generation = root_item->generation; 11185d4f98a2SYan Zheng super->root_level = root_item->level; 111973bc1876SJosef Bacik if (btrfs_test_opt(root, SPACE_CACHE)) 11200af3d00bSJosef Bacik super->cache_generation = root_item->generation; 11215d4f98a2SYan Zheng } 11225d4f98a2SYan Zheng 1123f36f3042SChris Mason int btrfs_transaction_in_commit(struct btrfs_fs_info *info) 1124f36f3042SChris Mason { 1125f36f3042SChris Mason int ret = 0; 1126a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 1127f36f3042SChris Mason if (info->running_transaction) 1128f36f3042SChris Mason ret = info->running_transaction->in_commit; 1129a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 1130f36f3042SChris Mason return ret; 1131f36f3042SChris Mason } 1132f36f3042SChris Mason 11338929ecfaSYan, Zheng int btrfs_transaction_blocked(struct btrfs_fs_info *info) 11348929ecfaSYan, Zheng { 11358929ecfaSYan, Zheng int ret = 0; 1136a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 11378929ecfaSYan, Zheng if (info->running_transaction) 11388929ecfaSYan, Zheng ret = info->running_transaction->blocked; 1139a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 11408929ecfaSYan, Zheng return ret; 11418929ecfaSYan, Zheng } 11428929ecfaSYan, Zheng 1143bb9c12c9SSage Weil /* 1144bb9c12c9SSage Weil * wait for the current transaction commit to start and block subsequent 1145bb9c12c9SSage Weil * transaction joins 1146bb9c12c9SSage Weil */ 1147bb9c12c9SSage Weil static void wait_current_trans_commit_start(struct btrfs_root *root, 1148bb9c12c9SSage Weil struct btrfs_transaction *trans) 1149bb9c12c9SSage Weil { 115072d63ed6SLi Zefan wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit); 1151bb9c12c9SSage Weil } 1152bb9c12c9SSage Weil 1153bb9c12c9SSage Weil /* 1154bb9c12c9SSage Weil * wait for the current transaction to start and then become unblocked. 1155bb9c12c9SSage Weil * caller holds ref. 1156bb9c12c9SSage Weil */ 1157bb9c12c9SSage Weil static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, 1158bb9c12c9SSage Weil struct btrfs_transaction *trans) 1159bb9c12c9SSage Weil { 116072d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 116172d63ed6SLi Zefan trans->commit_done || (trans->in_commit && !trans->blocked)); 1162bb9c12c9SSage Weil } 1163bb9c12c9SSage Weil 1164bb9c12c9SSage Weil /* 1165bb9c12c9SSage Weil * commit transactions asynchronously. once btrfs_commit_transaction_async 1166bb9c12c9SSage Weil * returns, any subsequent transaction will not be allowed to join. 1167bb9c12c9SSage Weil */ 1168bb9c12c9SSage Weil struct btrfs_async_commit { 1169bb9c12c9SSage Weil struct btrfs_trans_handle *newtrans; 1170bb9c12c9SSage Weil struct btrfs_root *root; 1171bb9c12c9SSage Weil struct delayed_work work; 1172bb9c12c9SSage Weil }; 1173bb9c12c9SSage Weil 1174bb9c12c9SSage Weil static void do_async_commit(struct work_struct *work) 1175bb9c12c9SSage Weil { 1176bb9c12c9SSage Weil struct btrfs_async_commit *ac = 1177bb9c12c9SSage Weil container_of(work, struct btrfs_async_commit, work.work); 1178bb9c12c9SSage Weil 1179bb9c12c9SSage Weil btrfs_commit_transaction(ac->newtrans, ac->root); 1180bb9c12c9SSage Weil kfree(ac); 1181bb9c12c9SSage Weil } 1182bb9c12c9SSage Weil 1183bb9c12c9SSage Weil int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 1184bb9c12c9SSage Weil struct btrfs_root *root, 1185bb9c12c9SSage Weil int wait_for_unblock) 1186bb9c12c9SSage Weil { 1187bb9c12c9SSage Weil struct btrfs_async_commit *ac; 1188bb9c12c9SSage Weil struct btrfs_transaction *cur_trans; 1189bb9c12c9SSage Weil 1190bb9c12c9SSage Weil ac = kmalloc(sizeof(*ac), GFP_NOFS); 1191db5b493aSTsutomu Itoh if (!ac) 1192db5b493aSTsutomu Itoh return -ENOMEM; 1193bb9c12c9SSage Weil 1194bb9c12c9SSage Weil INIT_DELAYED_WORK(&ac->work, do_async_commit); 1195bb9c12c9SSage Weil ac->root = root; 11967a7eaa40SJosef Bacik ac->newtrans = btrfs_join_transaction(root); 11973612b495STsutomu Itoh if (IS_ERR(ac->newtrans)) { 11983612b495STsutomu Itoh int err = PTR_ERR(ac->newtrans); 11993612b495STsutomu Itoh kfree(ac); 12003612b495STsutomu Itoh return err; 12013612b495STsutomu Itoh } 1202bb9c12c9SSage Weil 1203bb9c12c9SSage Weil /* take transaction reference */ 1204bb9c12c9SSage Weil cur_trans = trans->transaction; 120513c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 1206bb9c12c9SSage Weil 1207bb9c12c9SSage Weil btrfs_end_transaction(trans, root); 1208bb9c12c9SSage Weil schedule_delayed_work(&ac->work, 0); 1209bb9c12c9SSage Weil 1210bb9c12c9SSage Weil /* wait for transaction to start and unblock */ 1211bb9c12c9SSage Weil if (wait_for_unblock) 1212bb9c12c9SSage Weil wait_current_trans_commit_start_and_unblock(root, cur_trans); 1213bb9c12c9SSage Weil else 1214bb9c12c9SSage Weil wait_current_trans_commit_start(root, cur_trans); 1215bb9c12c9SSage Weil 121638e88054SSage Weil if (current->journal_info == trans) 121738e88054SSage Weil current->journal_info = NULL; 121838e88054SSage Weil 121938e88054SSage Weil put_transaction(cur_trans); 1220bb9c12c9SSage Weil return 0; 1221bb9c12c9SSage Weil } 1222bb9c12c9SSage Weil 122349b25e05SJeff Mahoney 122449b25e05SJeff Mahoney static void cleanup_transaction(struct btrfs_trans_handle *trans, 12257b8b92afSJosef Bacik struct btrfs_root *root, int err) 122649b25e05SJeff Mahoney { 122749b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 122849b25e05SJeff Mahoney 122949b25e05SJeff Mahoney WARN_ON(trans->use_count > 1); 123049b25e05SJeff Mahoney 12317b8b92afSJosef Bacik btrfs_abort_transaction(trans, root, err); 12327b8b92afSJosef Bacik 123349b25e05SJeff Mahoney spin_lock(&root->fs_info->trans_lock); 123449b25e05SJeff Mahoney list_del_init(&cur_trans->list); 1235d7096fc3SJosef Bacik if (cur_trans == root->fs_info->running_transaction) { 1236d7096fc3SJosef Bacik root->fs_info->running_transaction = NULL; 1237d7096fc3SJosef Bacik root->fs_info->trans_no_join = 0; 1238d7096fc3SJosef Bacik } 123949b25e05SJeff Mahoney spin_unlock(&root->fs_info->trans_lock); 124049b25e05SJeff Mahoney 124149b25e05SJeff Mahoney btrfs_cleanup_one_transaction(trans->transaction, root); 124249b25e05SJeff Mahoney 124349b25e05SJeff Mahoney put_transaction(cur_trans); 124449b25e05SJeff Mahoney put_transaction(cur_trans); 124549b25e05SJeff Mahoney 124649b25e05SJeff Mahoney trace_btrfs_transaction_commit(root); 124749b25e05SJeff Mahoney 124849b25e05SJeff Mahoney btrfs_scrub_continue(root); 124949b25e05SJeff Mahoney 125049b25e05SJeff Mahoney if (current->journal_info == trans) 125149b25e05SJeff Mahoney current->journal_info = NULL; 125249b25e05SJeff Mahoney 125349b25e05SJeff Mahoney kmem_cache_free(btrfs_trans_handle_cachep, trans); 125449b25e05SJeff Mahoney } 125549b25e05SJeff Mahoney 1256bb9c12c9SSage Weil /* 1257bb9c12c9SSage Weil * btrfs_transaction state sequence: 1258bb9c12c9SSage Weil * in_commit = 0, blocked = 0 (initial) 1259bb9c12c9SSage Weil * in_commit = 1, blocked = 1 1260bb9c12c9SSage Weil * blocked = 0 1261bb9c12c9SSage Weil * commit_done = 1 1262bb9c12c9SSage Weil */ 126379154b1bSChris Mason int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 126479154b1bSChris Mason struct btrfs_root *root) 126579154b1bSChris Mason { 126615ee9bc7SJosef Bacik unsigned long joined = 0; 126749b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 12688fd17795SChris Mason struct btrfs_transaction *prev_trans = NULL; 126979154b1bSChris Mason DEFINE_WAIT(wait); 127049b25e05SJeff Mahoney int ret = -EIO; 127189573b9cSChris Mason int should_grow = 0; 127289573b9cSChris Mason unsigned long now = get_seconds(); 1273dccae999SSage Weil int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); 127479154b1bSChris Mason 12755a3f23d5SChris Mason btrfs_run_ordered_operations(root, 0); 12765a3f23d5SChris Mason 1277b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 12789c8d86dbSJosef Bacik trans->block_rsv = NULL; 12799c8d86dbSJosef Bacik 128049b25e05SJeff Mahoney if (cur_trans->aborted) 128149b25e05SJeff Mahoney goto cleanup_transaction; 128249b25e05SJeff Mahoney 128356bec294SChris Mason /* make a pass through all the delayed refs we have so far 128456bec294SChris Mason * any runnings procs may add more while we are here 128556bec294SChris Mason */ 128656bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 128749b25e05SJeff Mahoney if (ret) 128849b25e05SJeff Mahoney goto cleanup_transaction; 128956bec294SChris Mason 1290b7ec40d7SChris Mason cur_trans = trans->transaction; 129149b25e05SJeff Mahoney 129256bec294SChris Mason /* 129356bec294SChris Mason * set the flushing flag so procs in this transaction have to 129456bec294SChris Mason * start sending their work down. 129556bec294SChris Mason */ 1296b7ec40d7SChris Mason cur_trans->delayed_refs.flushing = 1; 129756bec294SChris Mason 1298c3e69d58SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 129949b25e05SJeff Mahoney if (ret) 130049b25e05SJeff Mahoney goto cleanup_transaction; 130156bec294SChris Mason 1302a4abeea4SJosef Bacik spin_lock(&cur_trans->commit_lock); 1303b7ec40d7SChris Mason if (cur_trans->in_commit) { 1304a4abeea4SJosef Bacik spin_unlock(&cur_trans->commit_lock); 130513c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 130649b25e05SJeff Mahoney ret = btrfs_end_transaction(trans, root); 1307ccd467d6SChris Mason 1308b9c8300cSLi Zefan wait_for_commit(root, cur_trans); 130915ee9bc7SJosef Bacik 131079154b1bSChris Mason put_transaction(cur_trans); 131115ee9bc7SJosef Bacik 131249b25e05SJeff Mahoney return ret; 131379154b1bSChris Mason } 13144313b399SChris Mason 13152c90e5d6SChris Mason trans->transaction->in_commit = 1; 1316f9295749SChris Mason trans->transaction->blocked = 1; 1317a4abeea4SJosef Bacik spin_unlock(&cur_trans->commit_lock); 1318bb9c12c9SSage Weil wake_up(&root->fs_info->transaction_blocked_wait); 1319bb9c12c9SSage Weil 1320a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1321ccd467d6SChris Mason if (cur_trans->list.prev != &root->fs_info->trans_list) { 1322ccd467d6SChris Mason prev_trans = list_entry(cur_trans->list.prev, 1323ccd467d6SChris Mason struct btrfs_transaction, list); 1324ccd467d6SChris Mason if (!prev_trans->commit_done) { 132513c5a93eSJosef Bacik atomic_inc(&prev_trans->use_count); 1326a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1327ccd467d6SChris Mason 1328ccd467d6SChris Mason wait_for_commit(root, prev_trans); 1329ccd467d6SChris Mason 133015ee9bc7SJosef Bacik put_transaction(prev_trans); 1331a4abeea4SJosef Bacik } else { 1332a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1333ccd467d6SChris Mason } 1334a4abeea4SJosef Bacik } else { 1335a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1336ccd467d6SChris Mason } 133715ee9bc7SJosef Bacik 133889573b9cSChris Mason if (now < cur_trans->start_time || now - cur_trans->start_time < 1) 133989573b9cSChris Mason should_grow = 1; 134089573b9cSChris Mason 134115ee9bc7SJosef Bacik do { 13427ea394f1SYan Zheng int snap_pending = 0; 1343a4abeea4SJosef Bacik 134415ee9bc7SJosef Bacik joined = cur_trans->num_joined; 13457ea394f1SYan Zheng if (!list_empty(&trans->transaction->pending_snapshots)) 13467ea394f1SYan Zheng snap_pending = 1; 13477ea394f1SYan Zheng 13482c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 134915ee9bc7SJosef Bacik 13500bdb1db2SSage Weil if (flush_on_commit || snap_pending) { 135124bbcf04SYan, Zheng btrfs_start_delalloc_inodes(root, 1); 1352143bede5SJeff Mahoney btrfs_wait_ordered_extents(root, 0, 1); 13537ea394f1SYan Zheng } 13547ea394f1SYan Zheng 135516cdcec7SMiao Xie ret = btrfs_run_delayed_items(trans, root); 135649b25e05SJeff Mahoney if (ret) 135749b25e05SJeff Mahoney goto cleanup_transaction; 135816cdcec7SMiao Xie 13595a3f23d5SChris Mason /* 13605a3f23d5SChris Mason * rename don't use btrfs_join_transaction, so, once we 13615a3f23d5SChris Mason * set the transaction to blocked above, we aren't going 13625a3f23d5SChris Mason * to get any new ordered operations. We can safely run 13635a3f23d5SChris Mason * it here and no for sure that nothing new will be added 13645a3f23d5SChris Mason * to the list 13655a3f23d5SChris Mason */ 13665a3f23d5SChris Mason btrfs_run_ordered_operations(root, 1); 13675a3f23d5SChris Mason 1368ed3b3d31SChris Mason prepare_to_wait(&cur_trans->writer_wait, &wait, 1369ed3b3d31SChris Mason TASK_UNINTERRUPTIBLE); 1370ed3b3d31SChris Mason 137113c5a93eSJosef Bacik if (atomic_read(&cur_trans->num_writers) > 1) 137299d16cbcSSage Weil schedule_timeout(MAX_SCHEDULE_TIMEOUT); 137399d16cbcSSage Weil else if (should_grow) 137499d16cbcSSage Weil schedule_timeout(1); 137515ee9bc7SJosef Bacik 137615ee9bc7SJosef Bacik finish_wait(&cur_trans->writer_wait, &wait); 1377ed0ca140SJosef Bacik } while (atomic_read(&cur_trans->num_writers) > 1 || 1378ed0ca140SJosef Bacik (should_grow && cur_trans->num_joined != joined)); 1379ed0ca140SJosef Bacik 1380ed0ca140SJosef Bacik /* 1381ed0ca140SJosef Bacik * Ok now we need to make sure to block out any other joins while we 1382ed0ca140SJosef Bacik * commit the transaction. We could have started a join before setting 1383ed0ca140SJosef Bacik * no_join so make sure to wait for num_writers to == 1 again. 1384ed0ca140SJosef Bacik */ 1385a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1386a4abeea4SJosef Bacik root->fs_info->trans_no_join = 1; 1387a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1388ed0ca140SJosef Bacik wait_event(cur_trans->writer_wait, 1389ed0ca140SJosef Bacik atomic_read(&cur_trans->num_writers) == 1); 139015ee9bc7SJosef Bacik 13917585717fSChris Mason /* 13927585717fSChris Mason * the reloc mutex makes sure that we stop 13937585717fSChris Mason * the balancing code from coming in and moving 13947585717fSChris Mason * extents around in the middle of the commit 13957585717fSChris Mason */ 13967585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 13977585717fSChris Mason 1398e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 139949b25e05SJeff Mahoney if (ret) { 140049b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 140149b25e05SJeff Mahoney goto cleanup_transaction; 140249b25e05SJeff Mahoney } 14033063d29fSChris Mason 1404e999376fSChris Mason ret = create_pending_snapshots(trans, root->fs_info); 140549b25e05SJeff Mahoney if (ret) { 140649b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 140749b25e05SJeff Mahoney goto cleanup_transaction; 140849b25e05SJeff Mahoney } 140916cdcec7SMiao Xie 141056bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 141149b25e05SJeff Mahoney if (ret) { 141249b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 141349b25e05SJeff Mahoney goto cleanup_transaction; 141449b25e05SJeff Mahoney } 141556bec294SChris Mason 1416e999376fSChris Mason /* 1417e999376fSChris Mason * make sure none of the code above managed to slip in a 1418e999376fSChris Mason * delayed item 1419e999376fSChris Mason */ 1420e999376fSChris Mason btrfs_assert_delayed_root_empty(root); 1421e999376fSChris Mason 14222c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 1423dc17ff8fSChris Mason 1424a2de733cSArne Jansen btrfs_scrub_pause(root); 1425e02119d5SChris Mason /* btrfs_commit_tree_roots is responsible for getting the 1426e02119d5SChris Mason * various roots consistent with each other. Every pointer 1427e02119d5SChris Mason * in the tree of tree roots has to point to the most up to date 1428e02119d5SChris Mason * root for every subvolume and other tree. So, we have to keep 1429e02119d5SChris Mason * the tree logging code from jumping in and changing any 1430e02119d5SChris Mason * of the trees. 1431e02119d5SChris Mason * 1432e02119d5SChris Mason * At this point in the commit, there can't be any tree-log 1433e02119d5SChris Mason * writers, but a little lower down we drop the trans mutex 1434e02119d5SChris Mason * and let new people in. By holding the tree_log_mutex 1435e02119d5SChris Mason * from now until after the super is written, we avoid races 1436e02119d5SChris Mason * with the tree-log code. 1437e02119d5SChris Mason */ 1438e02119d5SChris Mason mutex_lock(&root->fs_info->tree_log_mutex); 14391a40e23bSZheng Yan 14405d4f98a2SYan Zheng ret = commit_fs_roots(trans, root); 144149b25e05SJeff Mahoney if (ret) { 144249b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 1443871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 144449b25e05SJeff Mahoney goto cleanup_transaction; 144549b25e05SJeff Mahoney } 144654aa1f4dSChris Mason 14475d4f98a2SYan Zheng /* commit_fs_roots gets rid of all the tree log roots, it is now 1448e02119d5SChris Mason * safe to free the root of tree log roots 1449e02119d5SChris Mason */ 1450e02119d5SChris Mason btrfs_free_log_root_tree(trans, root->fs_info); 1451e02119d5SChris Mason 14525d4f98a2SYan Zheng ret = commit_cowonly_roots(trans, root); 145349b25e05SJeff Mahoney if (ret) { 145449b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 1455871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 145649b25e05SJeff Mahoney goto cleanup_transaction; 145749b25e05SJeff Mahoney } 145854aa1f4dSChris Mason 145911833d66SYan Zheng btrfs_prepare_extent_commit(trans, root); 146011833d66SYan Zheng 146178fae27eSChris Mason cur_trans = root->fs_info->running_transaction; 14625f39d397SChris Mason 14635d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->tree_root->root_item, 14645d4f98a2SYan Zheng root->fs_info->tree_root->node); 1465817d52f8SJosef Bacik switch_commit_root(root->fs_info->tree_root); 14665d4f98a2SYan Zheng 14675d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->chunk_root->root_item, 14685d4f98a2SYan Zheng root->fs_info->chunk_root->node); 1469817d52f8SJosef Bacik switch_commit_root(root->fs_info->chunk_root); 14705d4f98a2SYan Zheng 14715d4f98a2SYan Zheng update_super_roots(root); 1472e02119d5SChris Mason 1473e02119d5SChris Mason if (!root->fs_info->log_root_recovering) { 14746c41761fSDavid Sterba btrfs_set_super_log_root(root->fs_info->super_copy, 0); 14756c41761fSDavid Sterba btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); 1476e02119d5SChris Mason } 1477e02119d5SChris Mason 14786c41761fSDavid Sterba memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, 14796c41761fSDavid Sterba sizeof(*root->fs_info->super_copy)); 1480ccd467d6SChris Mason 1481f9295749SChris Mason trans->transaction->blocked = 0; 1482a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1483a4abeea4SJosef Bacik root->fs_info->running_transaction = NULL; 1484a4abeea4SJosef Bacik root->fs_info->trans_no_join = 0; 1485a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 14867585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 1487b7ec40d7SChris Mason 1488f9295749SChris Mason wake_up(&root->fs_info->transaction_wait); 1489e6dcd2dcSChris Mason 149079154b1bSChris Mason ret = btrfs_write_and_wait_transaction(trans, root); 149149b25e05SJeff Mahoney if (ret) { 149249b25e05SJeff Mahoney btrfs_error(root->fs_info, ret, 149349b25e05SJeff Mahoney "Error while writing out transaction."); 149449b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 149549b25e05SJeff Mahoney goto cleanup_transaction; 149649b25e05SJeff Mahoney } 149749b25e05SJeff Mahoney 149849b25e05SJeff Mahoney ret = write_ctree_super(trans, root, 0); 149949b25e05SJeff Mahoney if (ret) { 150049b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 150149b25e05SJeff Mahoney goto cleanup_transaction; 150249b25e05SJeff Mahoney } 15034313b399SChris Mason 1504e02119d5SChris Mason /* 1505e02119d5SChris Mason * the super is written, we can safely allow the tree-loggers 1506e02119d5SChris Mason * to go about their business 1507e02119d5SChris Mason */ 1508e02119d5SChris Mason mutex_unlock(&root->fs_info->tree_log_mutex); 1509e02119d5SChris Mason 151011833d66SYan Zheng btrfs_finish_extent_commit(trans, root); 15114313b399SChris Mason 15122c90e5d6SChris Mason cur_trans->commit_done = 1; 1513b7ec40d7SChris Mason 151415ee9bc7SJosef Bacik root->fs_info->last_trans_committed = cur_trans->transid; 1515817d52f8SJosef Bacik 15162c90e5d6SChris Mason wake_up(&cur_trans->commit_wait); 15173de4586cSChris Mason 1518a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 151913c5a93eSJosef Bacik list_del_init(&cur_trans->list); 1520a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1521a4abeea4SJosef Bacik 152279154b1bSChris Mason put_transaction(cur_trans); 152378fae27eSChris Mason put_transaction(cur_trans); 152458176a96SJosef Bacik 1525b2b5ef5cSJan Kara sb_end_intwrite(root->fs_info->sb); 1526b2b5ef5cSJan Kara 15271abe9b8aSliubo trace_btrfs_transaction_commit(root); 15281abe9b8aSliubo 1529a2de733cSArne Jansen btrfs_scrub_continue(root); 1530a2de733cSArne Jansen 15319ed74f2dSJosef Bacik if (current->journal_info == trans) 15329ed74f2dSJosef Bacik current->journal_info = NULL; 15339ed74f2dSJosef Bacik 15342c90e5d6SChris Mason kmem_cache_free(btrfs_trans_handle_cachep, trans); 153524bbcf04SYan, Zheng 153624bbcf04SYan, Zheng if (current != root->fs_info->transaction_kthread) 153724bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 153824bbcf04SYan, Zheng 153979154b1bSChris Mason return ret; 154049b25e05SJeff Mahoney 154149b25e05SJeff Mahoney cleanup_transaction: 154249b25e05SJeff Mahoney btrfs_printk(root->fs_info, "Skipping commit of aborted transaction.\n"); 154349b25e05SJeff Mahoney // WARN_ON(1); 154449b25e05SJeff Mahoney if (current->journal_info == trans) 154549b25e05SJeff Mahoney current->journal_info = NULL; 15467b8b92afSJosef Bacik cleanup_transaction(trans, root, ret); 154749b25e05SJeff Mahoney 154849b25e05SJeff Mahoney return ret; 154979154b1bSChris Mason } 155079154b1bSChris Mason 1551d352ac68SChris Mason /* 1552d352ac68SChris Mason * interface function to delete all the snapshots we have scheduled for deletion 1553d352ac68SChris Mason */ 1554e9d0b13bSChris Mason int btrfs_clean_old_snapshots(struct btrfs_root *root) 1555e9d0b13bSChris Mason { 15565d4f98a2SYan Zheng LIST_HEAD(list); 15575d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 1558e9d0b13bSChris Mason 1559a4abeea4SJosef Bacik spin_lock(&fs_info->trans_lock); 15605d4f98a2SYan Zheng list_splice_init(&fs_info->dead_roots, &list); 1561a4abeea4SJosef Bacik spin_unlock(&fs_info->trans_lock); 15625d4f98a2SYan Zheng 15635d4f98a2SYan Zheng while (!list_empty(&list)) { 15642c536799SJeff Mahoney int ret; 15652c536799SJeff Mahoney 15665d4f98a2SYan Zheng root = list_entry(list.next, struct btrfs_root, root_list); 156776dda93cSYan, Zheng list_del(&root->root_list); 156876dda93cSYan, Zheng 156916cdcec7SMiao Xie btrfs_kill_all_delayed_nodes(root); 157016cdcec7SMiao Xie 157176dda93cSYan, Zheng if (btrfs_header_backref_rev(root->node) < 157276dda93cSYan, Zheng BTRFS_MIXED_BACKREF_REV) 15732c536799SJeff Mahoney ret = btrfs_drop_snapshot(root, NULL, 0, 0); 157476dda93cSYan, Zheng else 15752c536799SJeff Mahoney ret =btrfs_drop_snapshot(root, NULL, 1, 0); 15762c536799SJeff Mahoney BUG_ON(ret < 0); 1577e9d0b13bSChris Mason } 1578e9d0b13bSChris Mason return 0; 1579e9d0b13bSChris Mason } 1580