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> 258ea05e3aSAlexander Block #include <linux/uuid.h> 2679154b1bSChris Mason #include "ctree.h" 2779154b1bSChris Mason #include "disk-io.h" 2879154b1bSChris Mason #include "transaction.h" 29925baeddSChris Mason #include "locking.h" 30e02119d5SChris Mason #include "tree-log.h" 31581bb050SLi Zefan #include "inode-map.h" 32733f4fbbSStefan Behrens #include "volumes.h" 338dabb742SStefan Behrens #include "dev-replace.h" 34fcebe456SJosef Bacik #include "qgroup.h" 3579154b1bSChris Mason 360f7d52f4SChris Mason #define BTRFS_ROOT_TRANS_TAG 0 370f7d52f4SChris Mason 38e8c9f186SDavid Sterba static const unsigned int btrfs_blocked_trans_types[TRANS_STATE_MAX] = { 394a9d8bdeSMiao Xie [TRANS_STATE_RUNNING] = 0U, 404a9d8bdeSMiao Xie [TRANS_STATE_BLOCKED] = (__TRANS_USERSPACE | 414a9d8bdeSMiao Xie __TRANS_START), 424a9d8bdeSMiao Xie [TRANS_STATE_COMMIT_START] = (__TRANS_USERSPACE | 434a9d8bdeSMiao Xie __TRANS_START | 444a9d8bdeSMiao Xie __TRANS_ATTACH), 454a9d8bdeSMiao Xie [TRANS_STATE_COMMIT_DOING] = (__TRANS_USERSPACE | 464a9d8bdeSMiao Xie __TRANS_START | 474a9d8bdeSMiao Xie __TRANS_ATTACH | 484a9d8bdeSMiao Xie __TRANS_JOIN), 494a9d8bdeSMiao Xie [TRANS_STATE_UNBLOCKED] = (__TRANS_USERSPACE | 504a9d8bdeSMiao Xie __TRANS_START | 514a9d8bdeSMiao Xie __TRANS_ATTACH | 524a9d8bdeSMiao Xie __TRANS_JOIN | 534a9d8bdeSMiao Xie __TRANS_JOIN_NOLOCK), 544a9d8bdeSMiao Xie [TRANS_STATE_COMPLETED] = (__TRANS_USERSPACE | 554a9d8bdeSMiao Xie __TRANS_START | 564a9d8bdeSMiao Xie __TRANS_ATTACH | 574a9d8bdeSMiao Xie __TRANS_JOIN | 584a9d8bdeSMiao Xie __TRANS_JOIN_NOLOCK), 594a9d8bdeSMiao Xie }; 604a9d8bdeSMiao Xie 61724e2315SJosef Bacik void btrfs_put_transaction(struct btrfs_transaction *transaction) 6279154b1bSChris Mason { 6313c5a93eSJosef Bacik WARN_ON(atomic_read(&transaction->use_count) == 0); 6413c5a93eSJosef Bacik if (atomic_dec_and_test(&transaction->use_count)) { 65a4abeea4SJosef Bacik BUG_ON(!list_empty(&transaction->list)); 66c46effa6SLiu Bo WARN_ON(!RB_EMPTY_ROOT(&transaction->delayed_refs.href_root)); 671262133bSJosef Bacik if (transaction->delayed_refs.pending_csums) 681262133bSJosef Bacik printk(KERN_ERR "pending csums is %llu\n", 691262133bSJosef Bacik transaction->delayed_refs.pending_csums); 706df9a95eSJosef Bacik while (!list_empty(&transaction->pending_chunks)) { 716df9a95eSJosef Bacik struct extent_map *em; 726df9a95eSJosef Bacik 736df9a95eSJosef Bacik em = list_first_entry(&transaction->pending_chunks, 746df9a95eSJosef Bacik struct extent_map, list); 756df9a95eSJosef Bacik list_del_init(&em->list); 766df9a95eSJosef Bacik free_extent_map(em); 776df9a95eSJosef Bacik } 782c90e5d6SChris Mason kmem_cache_free(btrfs_transaction_cachep, transaction); 7979154b1bSChris Mason } 8078fae27eSChris Mason } 8179154b1bSChris Mason 82663dfbb0SFilipe Manana static void clear_btree_io_tree(struct extent_io_tree *tree) 83663dfbb0SFilipe Manana { 84663dfbb0SFilipe Manana spin_lock(&tree->lock); 85b666a9cdSDavid Sterba /* 86b666a9cdSDavid Sterba * Do a single barrier for the waitqueue_active check here, the state 87b666a9cdSDavid Sterba * of the waitqueue should not change once clear_btree_io_tree is 88b666a9cdSDavid Sterba * called. 89b666a9cdSDavid Sterba */ 90b666a9cdSDavid Sterba smp_mb(); 91663dfbb0SFilipe Manana while (!RB_EMPTY_ROOT(&tree->state)) { 92663dfbb0SFilipe Manana struct rb_node *node; 93663dfbb0SFilipe Manana struct extent_state *state; 94663dfbb0SFilipe Manana 95663dfbb0SFilipe Manana node = rb_first(&tree->state); 96663dfbb0SFilipe Manana state = rb_entry(node, struct extent_state, rb_node); 97663dfbb0SFilipe Manana rb_erase(&state->rb_node, &tree->state); 98663dfbb0SFilipe Manana RB_CLEAR_NODE(&state->rb_node); 99663dfbb0SFilipe Manana /* 100663dfbb0SFilipe Manana * btree io trees aren't supposed to have tasks waiting for 101663dfbb0SFilipe Manana * changes in the flags of extent states ever. 102663dfbb0SFilipe Manana */ 103663dfbb0SFilipe Manana ASSERT(!waitqueue_active(&state->wq)); 104663dfbb0SFilipe Manana free_extent_state(state); 105351810c1SDavid Sterba 106351810c1SDavid Sterba cond_resched_lock(&tree->lock); 107663dfbb0SFilipe Manana } 108663dfbb0SFilipe Manana spin_unlock(&tree->lock); 109663dfbb0SFilipe Manana } 110663dfbb0SFilipe Manana 1119e351cc8SJosef Bacik static noinline void switch_commit_roots(struct btrfs_transaction *trans, 1129e351cc8SJosef Bacik struct btrfs_fs_info *fs_info) 113817d52f8SJosef Bacik { 1149e351cc8SJosef Bacik struct btrfs_root *root, *tmp; 1159e351cc8SJosef Bacik 1169e351cc8SJosef Bacik down_write(&fs_info->commit_root_sem); 1179e351cc8SJosef Bacik list_for_each_entry_safe(root, tmp, &trans->switch_commits, 1189e351cc8SJosef Bacik dirty_list) { 1199e351cc8SJosef Bacik list_del_init(&root->dirty_list); 120817d52f8SJosef Bacik free_extent_buffer(root->commit_root); 121817d52f8SJosef Bacik root->commit_root = btrfs_root_node(root); 1229e351cc8SJosef Bacik if (is_fstree(root->objectid)) 1239e351cc8SJosef Bacik btrfs_unpin_free_ino(root); 124663dfbb0SFilipe Manana clear_btree_io_tree(&root->dirty_log_pages); 1259e351cc8SJosef Bacik } 1262b9dbef2SJosef Bacik 1272b9dbef2SJosef Bacik /* We can free old roots now. */ 1282b9dbef2SJosef Bacik spin_lock(&trans->dropped_roots_lock); 1292b9dbef2SJosef Bacik while (!list_empty(&trans->dropped_roots)) { 1302b9dbef2SJosef Bacik root = list_first_entry(&trans->dropped_roots, 1312b9dbef2SJosef Bacik struct btrfs_root, root_list); 1322b9dbef2SJosef Bacik list_del_init(&root->root_list); 1332b9dbef2SJosef Bacik spin_unlock(&trans->dropped_roots_lock); 1342b9dbef2SJosef Bacik btrfs_drop_and_free_fs_root(fs_info, root); 1352b9dbef2SJosef Bacik spin_lock(&trans->dropped_roots_lock); 1362b9dbef2SJosef Bacik } 1372b9dbef2SJosef Bacik spin_unlock(&trans->dropped_roots_lock); 1389e351cc8SJosef Bacik up_write(&fs_info->commit_root_sem); 139817d52f8SJosef Bacik } 140817d52f8SJosef Bacik 1410860adfdSMiao Xie static inline void extwriter_counter_inc(struct btrfs_transaction *trans, 1420860adfdSMiao Xie unsigned int type) 1430860adfdSMiao Xie { 1440860adfdSMiao Xie if (type & TRANS_EXTWRITERS) 1450860adfdSMiao Xie atomic_inc(&trans->num_extwriters); 1460860adfdSMiao Xie } 1470860adfdSMiao Xie 1480860adfdSMiao Xie static inline void extwriter_counter_dec(struct btrfs_transaction *trans, 1490860adfdSMiao Xie unsigned int type) 1500860adfdSMiao Xie { 1510860adfdSMiao Xie if (type & TRANS_EXTWRITERS) 1520860adfdSMiao Xie atomic_dec(&trans->num_extwriters); 1530860adfdSMiao Xie } 1540860adfdSMiao Xie 1550860adfdSMiao Xie static inline void extwriter_counter_init(struct btrfs_transaction *trans, 1560860adfdSMiao Xie unsigned int type) 1570860adfdSMiao Xie { 1580860adfdSMiao Xie atomic_set(&trans->num_extwriters, ((type & TRANS_EXTWRITERS) ? 1 : 0)); 1590860adfdSMiao Xie } 1600860adfdSMiao Xie 1610860adfdSMiao Xie static inline int extwriter_counter_read(struct btrfs_transaction *trans) 1620860adfdSMiao Xie { 1630860adfdSMiao Xie return atomic_read(&trans->num_extwriters); 164178260b2SMiao Xie } 165178260b2SMiao Xie 166d352ac68SChris Mason /* 167d352ac68SChris Mason * either allocate a new transaction or hop into the existing one 168d352ac68SChris Mason */ 1690860adfdSMiao Xie static noinline int join_transaction(struct btrfs_root *root, unsigned int type) 17079154b1bSChris Mason { 17179154b1bSChris Mason struct btrfs_transaction *cur_trans; 17219ae4e81SJan Schmidt struct btrfs_fs_info *fs_info = root->fs_info; 173a4abeea4SJosef Bacik 17419ae4e81SJan Schmidt spin_lock(&fs_info->trans_lock); 175d43317dcSChris Mason loop: 17649b25e05SJeff Mahoney /* The file system has been taken offline. No new transactions. */ 17787533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 17819ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 17949b25e05SJeff Mahoney return -EROFS; 18049b25e05SJeff Mahoney } 18149b25e05SJeff Mahoney 18219ae4e81SJan Schmidt cur_trans = fs_info->running_transaction; 183a4abeea4SJosef Bacik if (cur_trans) { 184871383beSDavid Sterba if (cur_trans->aborted) { 18519ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 18649b25e05SJeff Mahoney return cur_trans->aborted; 187871383beSDavid Sterba } 1884a9d8bdeSMiao Xie if (btrfs_blocked_trans_types[cur_trans->state] & type) { 189178260b2SMiao Xie spin_unlock(&fs_info->trans_lock); 190178260b2SMiao Xie return -EBUSY; 191178260b2SMiao Xie } 192a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 193a4abeea4SJosef Bacik atomic_inc(&cur_trans->num_writers); 1940860adfdSMiao Xie extwriter_counter_inc(cur_trans, type); 19519ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 196a4abeea4SJosef Bacik return 0; 197a4abeea4SJosef Bacik } 19819ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 199a4abeea4SJosef Bacik 200354aa0fbSMiao Xie /* 201354aa0fbSMiao Xie * If we are ATTACH, we just want to catch the current transaction, 202354aa0fbSMiao Xie * and commit it. If there is no transaction, just return ENOENT. 203354aa0fbSMiao Xie */ 204354aa0fbSMiao Xie if (type == TRANS_ATTACH) 205354aa0fbSMiao Xie return -ENOENT; 206354aa0fbSMiao Xie 2074a9d8bdeSMiao Xie /* 2084a9d8bdeSMiao Xie * JOIN_NOLOCK only happens during the transaction commit, so 2094a9d8bdeSMiao Xie * it is impossible that ->running_transaction is NULL 2104a9d8bdeSMiao Xie */ 2114a9d8bdeSMiao Xie BUG_ON(type == TRANS_JOIN_NOLOCK); 2124a9d8bdeSMiao Xie 213a4abeea4SJosef Bacik cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); 214db5b493aSTsutomu Itoh if (!cur_trans) 215db5b493aSTsutomu Itoh return -ENOMEM; 216d43317dcSChris Mason 21719ae4e81SJan Schmidt spin_lock(&fs_info->trans_lock); 21819ae4e81SJan Schmidt if (fs_info->running_transaction) { 219d43317dcSChris Mason /* 220d43317dcSChris Mason * someone started a transaction after we unlocked. Make sure 2214a9d8bdeSMiao Xie * to redo the checks above 222d43317dcSChris Mason */ 223a4abeea4SJosef Bacik kmem_cache_free(btrfs_transaction_cachep, cur_trans); 224d43317dcSChris Mason goto loop; 22587533c47SMiao Xie } else if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 226e4b50e14SDan Carpenter spin_unlock(&fs_info->trans_lock); 2277b8b92afSJosef Bacik kmem_cache_free(btrfs_transaction_cachep, cur_trans); 2287b8b92afSJosef Bacik return -EROFS; 229a4abeea4SJosef Bacik } 230d43317dcSChris Mason 23113c5a93eSJosef Bacik atomic_set(&cur_trans->num_writers, 1); 2320860adfdSMiao Xie extwriter_counter_init(cur_trans, type); 23379154b1bSChris Mason init_waitqueue_head(&cur_trans->writer_wait); 23479154b1bSChris Mason init_waitqueue_head(&cur_trans->commit_wait); 2354a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_RUNNING; 236a4abeea4SJosef Bacik /* 237a4abeea4SJosef Bacik * One for this trans handle, one so it will live on until we 238a4abeea4SJosef Bacik * commit the transaction. 239a4abeea4SJosef Bacik */ 240a4abeea4SJosef Bacik atomic_set(&cur_trans->use_count, 2); 24113212b54SZhao Lei cur_trans->have_free_bgs = 0; 24208607c1bSChris Mason cur_trans->start_time = get_seconds(); 2431bbc621eSChris Mason cur_trans->dirty_bg_run = 0; 24456bec294SChris Mason 245c46effa6SLiu Bo cur_trans->delayed_refs.href_root = RB_ROOT; 2463368d001SQu Wenruo cur_trans->delayed_refs.dirty_extent_root = RB_ROOT; 247d7df2c79SJosef Bacik atomic_set(&cur_trans->delayed_refs.num_entries, 0); 248c3e69d58SChris Mason cur_trans->delayed_refs.num_heads_ready = 0; 2491262133bSJosef Bacik cur_trans->delayed_refs.pending_csums = 0; 250c3e69d58SChris Mason cur_trans->delayed_refs.num_heads = 0; 25156bec294SChris Mason cur_trans->delayed_refs.flushing = 0; 252c3e69d58SChris Mason cur_trans->delayed_refs.run_delayed_start = 0; 2539086db86SQu Wenruo cur_trans->delayed_refs.qgroup_to_skip = 0; 25420b297d6SJan Schmidt 25520b297d6SJan Schmidt /* 25620b297d6SJan Schmidt * although the tree mod log is per file system and not per transaction, 25720b297d6SJan Schmidt * the log must never go across transaction boundaries. 25820b297d6SJan Schmidt */ 25920b297d6SJan Schmidt smp_mb(); 26031b1a2bdSJulia Lawall if (!list_empty(&fs_info->tree_mod_seq_list)) 261efe120a0SFrank Holton WARN(1, KERN_ERR "BTRFS: tree_mod_seq_list not empty when " 26220b297d6SJan Schmidt "creating a fresh transaction\n"); 26331b1a2bdSJulia Lawall if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) 264efe120a0SFrank Holton WARN(1, KERN_ERR "BTRFS: tree_mod_log rb tree not empty when " 26520b297d6SJan Schmidt "creating a fresh transaction\n"); 266fc36ed7eSJan Schmidt atomic64_set(&fs_info->tree_mod_seq, 0); 26720b297d6SJan Schmidt 26856bec294SChris Mason spin_lock_init(&cur_trans->delayed_refs.lock); 26956bec294SChris Mason 2703063d29fSChris Mason INIT_LIST_HEAD(&cur_trans->pending_snapshots); 2716df9a95eSJosef Bacik INIT_LIST_HEAD(&cur_trans->pending_chunks); 2729e351cc8SJosef Bacik INIT_LIST_HEAD(&cur_trans->switch_commits); 27350d9aa99SJosef Bacik INIT_LIST_HEAD(&cur_trans->pending_ordered); 274ce93ec54SJosef Bacik INIT_LIST_HEAD(&cur_trans->dirty_bgs); 2751bbc621eSChris Mason INIT_LIST_HEAD(&cur_trans->io_bgs); 2762b9dbef2SJosef Bacik INIT_LIST_HEAD(&cur_trans->dropped_roots); 2771bbc621eSChris Mason mutex_init(&cur_trans->cache_write_mutex); 278cb723e49SJosef Bacik cur_trans->num_dirty_bgs = 0; 279ce93ec54SJosef Bacik spin_lock_init(&cur_trans->dirty_bgs_lock); 280e33e17eeSJeff Mahoney INIT_LIST_HEAD(&cur_trans->deleted_bgs); 281e33e17eeSJeff Mahoney spin_lock_init(&cur_trans->deleted_bgs_lock); 2822b9dbef2SJosef Bacik spin_lock_init(&cur_trans->dropped_roots_lock); 28319ae4e81SJan Schmidt list_add_tail(&cur_trans->list, &fs_info->trans_list); 284d1310b2eSChris Mason extent_io_tree_init(&cur_trans->dirty_pages, 28519ae4e81SJan Schmidt fs_info->btree_inode->i_mapping); 28619ae4e81SJan Schmidt fs_info->generation++; 28719ae4e81SJan Schmidt cur_trans->transid = fs_info->generation; 28819ae4e81SJan Schmidt fs_info->running_transaction = cur_trans; 28949b25e05SJeff Mahoney cur_trans->aborted = 0; 29019ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 29115ee9bc7SJosef Bacik 29279154b1bSChris Mason return 0; 29379154b1bSChris Mason } 29479154b1bSChris Mason 295d352ac68SChris Mason /* 296d397712bSChris Mason * this does all the record keeping required to make sure that a reference 297d397712bSChris Mason * counted root is properly recorded in a given transaction. This is required 298d397712bSChris Mason * to make sure the old root from before we joined the transaction is deleted 299d397712bSChris Mason * when the transaction commits 300d352ac68SChris Mason */ 3017585717fSChris Mason static int record_root_in_trans(struct btrfs_trans_handle *trans, 3025d4f98a2SYan Zheng struct btrfs_root *root) 3036702ed49SChris Mason { 30427cdeb70SMiao Xie if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) && 30527cdeb70SMiao Xie root->last_trans < trans->transid) { 3066702ed49SChris Mason WARN_ON(root == root->fs_info->extent_root); 3075d4f98a2SYan Zheng WARN_ON(root->commit_root != root->node); 3085d4f98a2SYan Zheng 3097585717fSChris Mason /* 31027cdeb70SMiao Xie * see below for IN_TRANS_SETUP usage rules 3117585717fSChris Mason * we have the reloc mutex held now, so there 3127585717fSChris Mason * is only one writer in this function 3137585717fSChris Mason */ 31427cdeb70SMiao Xie set_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state); 3157585717fSChris Mason 31627cdeb70SMiao Xie /* make sure readers find IN_TRANS_SETUP before 3177585717fSChris Mason * they find our root->last_trans update 3187585717fSChris Mason */ 3197585717fSChris Mason smp_wmb(); 3207585717fSChris Mason 321a4abeea4SJosef Bacik spin_lock(&root->fs_info->fs_roots_radix_lock); 322a4abeea4SJosef Bacik if (root->last_trans == trans->transid) { 323a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 324a4abeea4SJosef Bacik return 0; 325a4abeea4SJosef Bacik } 3266702ed49SChris Mason radix_tree_tag_set(&root->fs_info->fs_roots_radix, 3276702ed49SChris Mason (unsigned long)root->root_key.objectid, 3286702ed49SChris Mason BTRFS_ROOT_TRANS_TAG); 329a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 3307585717fSChris Mason root->last_trans = trans->transid; 3317585717fSChris Mason 3327585717fSChris Mason /* this is pretty tricky. We don't want to 3337585717fSChris Mason * take the relocation lock in btrfs_record_root_in_trans 3347585717fSChris Mason * unless we're really doing the first setup for this root in 3357585717fSChris Mason * this transaction. 3367585717fSChris Mason * 3377585717fSChris Mason * Normally we'd use root->last_trans as a flag to decide 3387585717fSChris Mason * if we want to take the expensive mutex. 3397585717fSChris Mason * 3407585717fSChris Mason * But, we have to set root->last_trans before we 3417585717fSChris Mason * init the relocation root, otherwise, we trip over warnings 3427585717fSChris Mason * in ctree.c. The solution used here is to flag ourselves 34327cdeb70SMiao Xie * with root IN_TRANS_SETUP. When this is 1, we're still 3447585717fSChris Mason * fixing up the reloc trees and everyone must wait. 3457585717fSChris Mason * 3467585717fSChris Mason * When this is zero, they can trust root->last_trans and fly 3477585717fSChris Mason * through btrfs_record_root_in_trans without having to take the 3487585717fSChris Mason * lock. smp_wmb() makes sure that all the writes above are 3497585717fSChris Mason * done before we pop in the zero below 3507585717fSChris Mason */ 3515d4f98a2SYan Zheng btrfs_init_reloc_root(trans, root); 352c7548af6SChris Mason smp_mb__before_atomic(); 35327cdeb70SMiao Xie clear_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state); 3546702ed49SChris Mason } 3555d4f98a2SYan Zheng return 0; 3566702ed49SChris Mason } 3575d4f98a2SYan Zheng 3587585717fSChris Mason 3592b9dbef2SJosef Bacik void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, 3602b9dbef2SJosef Bacik struct btrfs_root *root) 3612b9dbef2SJosef Bacik { 3622b9dbef2SJosef Bacik struct btrfs_transaction *cur_trans = trans->transaction; 3632b9dbef2SJosef Bacik 3642b9dbef2SJosef Bacik /* Add ourselves to the transaction dropped list */ 3652b9dbef2SJosef Bacik spin_lock(&cur_trans->dropped_roots_lock); 3662b9dbef2SJosef Bacik list_add_tail(&root->root_list, &cur_trans->dropped_roots); 3672b9dbef2SJosef Bacik spin_unlock(&cur_trans->dropped_roots_lock); 3682b9dbef2SJosef Bacik 3692b9dbef2SJosef Bacik /* Make sure we don't try to update the root at commit time */ 3702b9dbef2SJosef Bacik spin_lock(&root->fs_info->fs_roots_radix_lock); 3712b9dbef2SJosef Bacik radix_tree_tag_clear(&root->fs_info->fs_roots_radix, 3722b9dbef2SJosef Bacik (unsigned long)root->root_key.objectid, 3732b9dbef2SJosef Bacik BTRFS_ROOT_TRANS_TAG); 3742b9dbef2SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 3752b9dbef2SJosef Bacik } 3762b9dbef2SJosef Bacik 3777585717fSChris Mason int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 3787585717fSChris Mason struct btrfs_root *root) 3797585717fSChris Mason { 38027cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 3817585717fSChris Mason return 0; 3827585717fSChris Mason 3837585717fSChris Mason /* 38427cdeb70SMiao Xie * see record_root_in_trans for comments about IN_TRANS_SETUP usage 3857585717fSChris Mason * and barriers 3867585717fSChris Mason */ 3877585717fSChris Mason smp_rmb(); 3887585717fSChris Mason if (root->last_trans == trans->transid && 38927cdeb70SMiao Xie !test_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state)) 3907585717fSChris Mason return 0; 3917585717fSChris Mason 3927585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 3937585717fSChris Mason record_root_in_trans(trans, root); 3947585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 3957585717fSChris Mason 3967585717fSChris Mason return 0; 3977585717fSChris Mason } 3987585717fSChris Mason 3994a9d8bdeSMiao Xie static inline int is_transaction_blocked(struct btrfs_transaction *trans) 4004a9d8bdeSMiao Xie { 4014a9d8bdeSMiao Xie return (trans->state >= TRANS_STATE_BLOCKED && 402501407aaSJosef Bacik trans->state < TRANS_STATE_UNBLOCKED && 403501407aaSJosef Bacik !trans->aborted); 4044a9d8bdeSMiao Xie } 4054a9d8bdeSMiao Xie 406d352ac68SChris Mason /* wait for commit against the current transaction to become unblocked 407d352ac68SChris Mason * when this is done, it is safe to start a new transaction, but the current 408d352ac68SChris Mason * transaction might not be fully on disk. 409d352ac68SChris Mason */ 41037d1aeeeSChris Mason static void wait_current_trans(struct btrfs_root *root) 41179154b1bSChris Mason { 412f9295749SChris Mason struct btrfs_transaction *cur_trans; 41379154b1bSChris Mason 414a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 415f9295749SChris Mason cur_trans = root->fs_info->running_transaction; 4164a9d8bdeSMiao Xie if (cur_trans && is_transaction_blocked(cur_trans)) { 41713c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 418a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 41972d63ed6SLi Zefan 42072d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 421501407aaSJosef Bacik cur_trans->state >= TRANS_STATE_UNBLOCKED || 422501407aaSJosef Bacik cur_trans->aborted); 423724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 424a4abeea4SJosef Bacik } else { 425a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 426f9295749SChris Mason } 42737d1aeeeSChris Mason } 42837d1aeeeSChris Mason 429a22285a6SYan, Zheng static int may_wait_transaction(struct btrfs_root *root, int type) 43037d1aeeeSChris Mason { 431a4abeea4SJosef Bacik if (root->fs_info->log_root_recovering) 432a4abeea4SJosef Bacik return 0; 433a4abeea4SJosef Bacik 434a4abeea4SJosef Bacik if (type == TRANS_USERSPACE) 435a22285a6SYan, Zheng return 1; 436a4abeea4SJosef Bacik 437a4abeea4SJosef Bacik if (type == TRANS_START && 438a4abeea4SJosef Bacik !atomic_read(&root->fs_info->open_ioctl_trans)) 439a4abeea4SJosef Bacik return 1; 440a4abeea4SJosef Bacik 441a22285a6SYan, Zheng return 0; 442a22285a6SYan, Zheng } 443a22285a6SYan, Zheng 44420dd2cbfSMiao Xie static inline bool need_reserve_reloc_root(struct btrfs_root *root) 44520dd2cbfSMiao Xie { 44620dd2cbfSMiao Xie if (!root->fs_info->reloc_ctl || 44727cdeb70SMiao Xie !test_bit(BTRFS_ROOT_REF_COWS, &root->state) || 44820dd2cbfSMiao Xie root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID || 44920dd2cbfSMiao Xie root->reloc_root) 45020dd2cbfSMiao Xie return false; 45120dd2cbfSMiao Xie 45220dd2cbfSMiao Xie return true; 45320dd2cbfSMiao Xie } 45420dd2cbfSMiao Xie 45508e007d2SMiao Xie static struct btrfs_trans_handle * 4560860adfdSMiao Xie start_transaction(struct btrfs_root *root, u64 num_items, unsigned int type, 45708e007d2SMiao Xie enum btrfs_reserve_flush_enum flush) 458a22285a6SYan, Zheng { 459a22285a6SYan, Zheng struct btrfs_trans_handle *h; 460a22285a6SYan, Zheng struct btrfs_transaction *cur_trans; 461b5009945SJosef Bacik u64 num_bytes = 0; 462c5567237SArne Jansen u64 qgroup_reserved = 0; 46320dd2cbfSMiao Xie bool reloc_reserved = false; 46420dd2cbfSMiao Xie int ret; 465acce952bSliubo 46646c4e71eSFilipe Manana /* Send isn't supposed to start transactions. */ 4672755a0deSDavid Sterba ASSERT(current->journal_info != BTRFS_SEND_TRANS_STUB); 46846c4e71eSFilipe Manana 46987533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) 470acce952bSliubo return ERR_PTR(-EROFS); 4712a1eb461SJosef Bacik 47246c4e71eSFilipe Manana if (current->journal_info) { 4730860adfdSMiao Xie WARN_ON(type & TRANS_EXTWRITERS); 4742a1eb461SJosef Bacik h = current->journal_info; 4752a1eb461SJosef Bacik h->use_count++; 476b7d5b0a8SMiao Xie WARN_ON(h->use_count > 2); 4772a1eb461SJosef Bacik h->orig_rsv = h->block_rsv; 4782a1eb461SJosef Bacik h->block_rsv = NULL; 4792a1eb461SJosef Bacik goto got_it; 4802a1eb461SJosef Bacik } 481b5009945SJosef Bacik 482b5009945SJosef Bacik /* 483b5009945SJosef Bacik * Do the reservation before we join the transaction so we can do all 484b5009945SJosef Bacik * the appropriate flushing if need be. 485b5009945SJosef Bacik */ 486b5009945SJosef Bacik if (num_items > 0 && root != root->fs_info->chunk_root) { 487c5567237SArne Jansen if (root->fs_info->quota_enabled && 488c5567237SArne Jansen is_fstree(root->root_key.objectid)) { 489707e8a07SDavid Sterba qgroup_reserved = num_items * root->nodesize; 490c5567237SArne Jansen ret = btrfs_qgroup_reserve(root, qgroup_reserved); 491c5567237SArne Jansen if (ret) 492c5567237SArne Jansen return ERR_PTR(ret); 493c5567237SArne Jansen } 494c5567237SArne Jansen 495b5009945SJosef Bacik num_bytes = btrfs_calc_trans_metadata_size(root, num_items); 49620dd2cbfSMiao Xie /* 49720dd2cbfSMiao Xie * Do the reservation for the relocation root creation 49820dd2cbfSMiao Xie */ 499ee39b432SDavid Sterba if (need_reserve_reloc_root(root)) { 50020dd2cbfSMiao Xie num_bytes += root->nodesize; 50120dd2cbfSMiao Xie reloc_reserved = true; 50220dd2cbfSMiao Xie } 50320dd2cbfSMiao Xie 5044a92b1b8SJosef Bacik ret = btrfs_block_rsv_add(root, 505b5009945SJosef Bacik &root->fs_info->trans_block_rsv, 50608e007d2SMiao Xie num_bytes, flush); 507b5009945SJosef Bacik if (ret) 508843fcf35SMiao Xie goto reserve_fail; 509b5009945SJosef Bacik } 510a22285a6SYan, Zheng again: 511a22285a6SYan, Zheng h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); 512843fcf35SMiao Xie if (!h) { 513843fcf35SMiao Xie ret = -ENOMEM; 514843fcf35SMiao Xie goto alloc_fail; 515843fcf35SMiao Xie } 516a22285a6SYan, Zheng 51798114659SJosef Bacik /* 51898114659SJosef Bacik * If we are JOIN_NOLOCK we're already committing a transaction and 51998114659SJosef Bacik * waiting on this guy, so we don't need to do the sb_start_intwrite 52098114659SJosef Bacik * because we're already holding a ref. We need this because we could 52198114659SJosef Bacik * have raced in and did an fsync() on a file which can kick a commit 52298114659SJosef Bacik * and then we deadlock with somebody doing a freeze. 523354aa0fbSMiao Xie * 524354aa0fbSMiao Xie * If we are ATTACH, it means we just want to catch the current 525354aa0fbSMiao Xie * transaction and commit it, so we needn't do sb_start_intwrite(). 52698114659SJosef Bacik */ 5270860adfdSMiao Xie if (type & __TRANS_FREEZABLE) 528b2b5ef5cSJan Kara sb_start_intwrite(root->fs_info->sb); 529b2b5ef5cSJan Kara 530a22285a6SYan, Zheng if (may_wait_transaction(root, type)) 53137d1aeeeSChris Mason wait_current_trans(root); 532a22285a6SYan, Zheng 533a4abeea4SJosef Bacik do { 534354aa0fbSMiao Xie ret = join_transaction(root, type); 535178260b2SMiao Xie if (ret == -EBUSY) { 536a4abeea4SJosef Bacik wait_current_trans(root); 537178260b2SMiao Xie if (unlikely(type == TRANS_ATTACH)) 538178260b2SMiao Xie ret = -ENOENT; 539178260b2SMiao Xie } 540a4abeea4SJosef Bacik } while (ret == -EBUSY); 541a4abeea4SJosef Bacik 542db5b493aSTsutomu Itoh if (ret < 0) { 543354aa0fbSMiao Xie /* We must get the transaction if we are JOIN_NOLOCK. */ 544354aa0fbSMiao Xie BUG_ON(type == TRANS_JOIN_NOLOCK); 545843fcf35SMiao Xie goto join_fail; 546db5b493aSTsutomu Itoh } 5470f7d52f4SChris Mason 548a22285a6SYan, Zheng cur_trans = root->fs_info->running_transaction; 549a22285a6SYan, Zheng 550a22285a6SYan, Zheng h->transid = cur_trans->transid; 551a22285a6SYan, Zheng h->transaction = cur_trans; 55279154b1bSChris Mason h->blocks_used = 0; 553a22285a6SYan, Zheng h->bytes_reserved = 0; 5544fbcdf66SFilipe Manana h->chunk_bytes_reserved = 0; 555d13603efSArne Jansen h->root = root; 55656bec294SChris Mason h->delayed_ref_updates = 0; 5572a1eb461SJosef Bacik h->use_count = 1; 5580e721106SJosef Bacik h->adding_csums = 0; 559f0486c68SYan, Zheng h->block_rsv = NULL; 5602a1eb461SJosef Bacik h->orig_rsv = NULL; 56149b25e05SJeff Mahoney h->aborted = 0; 5624b824906SMiao Xie h->qgroup_reserved = 0; 563bed92eaeSArne Jansen h->delayed_ref_elem.seq = 0; 564a698d075SMiao Xie h->type = type; 565c6b305a8SJosef Bacik h->allocating_chunk = false; 56620dd2cbfSMiao Xie h->reloc_reserved = false; 5675039eddcSJosef Bacik h->sync = false; 568bed92eaeSArne Jansen INIT_LIST_HEAD(&h->qgroup_ref_list); 569ea658badSJosef Bacik INIT_LIST_HEAD(&h->new_bgs); 57050d9aa99SJosef Bacik INIT_LIST_HEAD(&h->ordered); 571b7ec40d7SChris Mason 572a22285a6SYan, Zheng smp_mb(); 5734a9d8bdeSMiao Xie if (cur_trans->state >= TRANS_STATE_BLOCKED && 5744a9d8bdeSMiao Xie may_wait_transaction(root, type)) { 575abdd2e80SFilipe Manana current->journal_info = h; 576a22285a6SYan, Zheng btrfs_commit_transaction(h, root); 577a22285a6SYan, Zheng goto again; 578a22285a6SYan, Zheng } 5799ed74f2dSJosef Bacik 580b5009945SJosef Bacik if (num_bytes) { 5818c2a3ca2SJosef Bacik trace_btrfs_space_reservation(root->fs_info, "transaction", 5822bcc0328SLiu Bo h->transid, num_bytes, 1); 583b5009945SJosef Bacik h->block_rsv = &root->fs_info->trans_block_rsv; 584b5009945SJosef Bacik h->bytes_reserved = num_bytes; 58520dd2cbfSMiao Xie h->reloc_reserved = reloc_reserved; 586a22285a6SYan, Zheng } 5874b824906SMiao Xie h->qgroup_reserved = qgroup_reserved; 588a22285a6SYan, Zheng 5892a1eb461SJosef Bacik got_it: 590a4abeea4SJosef Bacik btrfs_record_root_in_trans(h, root); 591a22285a6SYan, Zheng 592a22285a6SYan, Zheng if (!current->journal_info && type != TRANS_USERSPACE) 593a22285a6SYan, Zheng current->journal_info = h; 59479154b1bSChris Mason return h; 595843fcf35SMiao Xie 596843fcf35SMiao Xie join_fail: 5970860adfdSMiao Xie if (type & __TRANS_FREEZABLE) 598843fcf35SMiao Xie sb_end_intwrite(root->fs_info->sb); 599843fcf35SMiao Xie kmem_cache_free(btrfs_trans_handle_cachep, h); 600843fcf35SMiao Xie alloc_fail: 601843fcf35SMiao Xie if (num_bytes) 602843fcf35SMiao Xie btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv, 603843fcf35SMiao Xie num_bytes); 604843fcf35SMiao Xie reserve_fail: 605843fcf35SMiao Xie if (qgroup_reserved) 606843fcf35SMiao Xie btrfs_qgroup_free(root, qgroup_reserved); 607843fcf35SMiao Xie return ERR_PTR(ret); 60879154b1bSChris Mason } 60979154b1bSChris Mason 610f9295749SChris Mason struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 611a22285a6SYan, Zheng int num_items) 612f9295749SChris Mason { 61308e007d2SMiao Xie return start_transaction(root, num_items, TRANS_START, 61408e007d2SMiao Xie BTRFS_RESERVE_FLUSH_ALL); 615f9295749SChris Mason } 6168407aa46SMiao Xie 61708e007d2SMiao Xie struct btrfs_trans_handle *btrfs_start_transaction_lflush( 6188407aa46SMiao Xie struct btrfs_root *root, int num_items) 6198407aa46SMiao Xie { 62008e007d2SMiao Xie return start_transaction(root, num_items, TRANS_START, 62108e007d2SMiao Xie BTRFS_RESERVE_FLUSH_LIMIT); 6228407aa46SMiao Xie } 6238407aa46SMiao Xie 6247a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) 625f9295749SChris Mason { 6268407aa46SMiao Xie return start_transaction(root, 0, TRANS_JOIN, 0); 627f9295749SChris Mason } 628f9295749SChris Mason 6297a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) 6300af3d00bSJosef Bacik { 6318407aa46SMiao Xie return start_transaction(root, 0, TRANS_JOIN_NOLOCK, 0); 6320af3d00bSJosef Bacik } 6330af3d00bSJosef Bacik 6347a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) 6359ca9ee09SSage Weil { 6368407aa46SMiao Xie return start_transaction(root, 0, TRANS_USERSPACE, 0); 6379ca9ee09SSage Weil } 6389ca9ee09SSage Weil 639d4edf39bSMiao Xie /* 640d4edf39bSMiao Xie * btrfs_attach_transaction() - catch the running transaction 641d4edf39bSMiao Xie * 642d4edf39bSMiao Xie * It is used when we want to commit the current the transaction, but 643d4edf39bSMiao Xie * don't want to start a new one. 644d4edf39bSMiao Xie * 645d4edf39bSMiao Xie * Note: If this function return -ENOENT, it just means there is no 646d4edf39bSMiao Xie * running transaction. But it is possible that the inactive transaction 647d4edf39bSMiao Xie * is still in the memory, not fully on disk. If you hope there is no 648d4edf39bSMiao Xie * inactive transaction in the fs when -ENOENT is returned, you should 649d4edf39bSMiao Xie * invoke 650d4edf39bSMiao Xie * btrfs_attach_transaction_barrier() 651d4edf39bSMiao Xie */ 652354aa0fbSMiao Xie struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root) 65360376ce4SJosef Bacik { 654354aa0fbSMiao Xie return start_transaction(root, 0, TRANS_ATTACH, 0); 65560376ce4SJosef Bacik } 65660376ce4SJosef Bacik 657d4edf39bSMiao Xie /* 65890b6d283SWang Sheng-Hui * btrfs_attach_transaction_barrier() - catch the running transaction 659d4edf39bSMiao Xie * 660d4edf39bSMiao Xie * It is similar to the above function, the differentia is this one 661d4edf39bSMiao Xie * will wait for all the inactive transactions until they fully 662d4edf39bSMiao Xie * complete. 663d4edf39bSMiao Xie */ 664d4edf39bSMiao Xie struct btrfs_trans_handle * 665d4edf39bSMiao Xie btrfs_attach_transaction_barrier(struct btrfs_root *root) 666d4edf39bSMiao Xie { 667d4edf39bSMiao Xie struct btrfs_trans_handle *trans; 668d4edf39bSMiao Xie 669d4edf39bSMiao Xie trans = start_transaction(root, 0, TRANS_ATTACH, 0); 670d4edf39bSMiao Xie if (IS_ERR(trans) && PTR_ERR(trans) == -ENOENT) 671d4edf39bSMiao Xie btrfs_wait_for_commit(root, 0); 672d4edf39bSMiao Xie 673d4edf39bSMiao Xie return trans; 674d4edf39bSMiao Xie } 675d4edf39bSMiao Xie 676d352ac68SChris Mason /* wait for a transaction commit to be fully complete */ 677b9c8300cSLi Zefan static noinline void wait_for_commit(struct btrfs_root *root, 67889ce8a63SChris Mason struct btrfs_transaction *commit) 67989ce8a63SChris Mason { 6804a9d8bdeSMiao Xie wait_event(commit->commit_wait, commit->state == TRANS_STATE_COMPLETED); 68189ce8a63SChris Mason } 68289ce8a63SChris Mason 68346204592SSage Weil int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) 68446204592SSage Weil { 68546204592SSage Weil struct btrfs_transaction *cur_trans = NULL, *t; 6868cd2807fSMiao Xie int ret = 0; 68746204592SSage Weil 68846204592SSage Weil if (transid) { 68946204592SSage Weil if (transid <= root->fs_info->last_trans_committed) 690a4abeea4SJosef Bacik goto out; 69146204592SSage Weil 69246204592SSage Weil /* find specified transaction */ 693a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 69446204592SSage Weil list_for_each_entry(t, &root->fs_info->trans_list, list) { 69546204592SSage Weil if (t->transid == transid) { 69646204592SSage Weil cur_trans = t; 697a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 6988cd2807fSMiao Xie ret = 0; 69946204592SSage Weil break; 70046204592SSage Weil } 7018cd2807fSMiao Xie if (t->transid > transid) { 7028cd2807fSMiao Xie ret = 0; 70346204592SSage Weil break; 70446204592SSage Weil } 7058cd2807fSMiao Xie } 706a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 70742383020SSage Weil 70842383020SSage Weil /* 70942383020SSage Weil * The specified transaction doesn't exist, or we 71042383020SSage Weil * raced with btrfs_commit_transaction 71142383020SSage Weil */ 71242383020SSage Weil if (!cur_trans) { 71342383020SSage Weil if (transid > root->fs_info->last_trans_committed) 71442383020SSage Weil ret = -EINVAL; 7158cd2807fSMiao Xie goto out; 71642383020SSage Weil } 71746204592SSage Weil } else { 71846204592SSage Weil /* find newest transaction that is committing | committed */ 719a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 72046204592SSage Weil list_for_each_entry_reverse(t, &root->fs_info->trans_list, 72146204592SSage Weil list) { 7224a9d8bdeSMiao Xie if (t->state >= TRANS_STATE_COMMIT_START) { 7234a9d8bdeSMiao Xie if (t->state == TRANS_STATE_COMPLETED) 7243473f3c0SJosef Bacik break; 72546204592SSage Weil cur_trans = t; 726a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 72746204592SSage Weil break; 72846204592SSage Weil } 72946204592SSage Weil } 730a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 73146204592SSage Weil if (!cur_trans) 732a4abeea4SJosef Bacik goto out; /* nothing committing|committed */ 73346204592SSage Weil } 73446204592SSage Weil 73546204592SSage Weil wait_for_commit(root, cur_trans); 736724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 737a4abeea4SJosef Bacik out: 73846204592SSage Weil return ret; 73946204592SSage Weil } 74046204592SSage Weil 74137d1aeeeSChris Mason void btrfs_throttle(struct btrfs_root *root) 74237d1aeeeSChris Mason { 743a4abeea4SJosef Bacik if (!atomic_read(&root->fs_info->open_ioctl_trans)) 74437d1aeeeSChris Mason wait_current_trans(root); 74537d1aeeeSChris Mason } 74637d1aeeeSChris Mason 7478929ecfaSYan, Zheng static int should_end_transaction(struct btrfs_trans_handle *trans, 7488929ecfaSYan, Zheng struct btrfs_root *root) 7498929ecfaSYan, Zheng { 7501be41b78SJosef Bacik if (root->fs_info->global_block_rsv.space_info->full && 7510a2b2a84SJosef Bacik btrfs_check_space_for_delayed_refs(trans, root)) 7521be41b78SJosef Bacik return 1; 75336ba022aSJosef Bacik 7541be41b78SJosef Bacik return !!btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); 7558929ecfaSYan, Zheng } 7568929ecfaSYan, Zheng 7578929ecfaSYan, Zheng int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 7588929ecfaSYan, Zheng struct btrfs_root *root) 7598929ecfaSYan, Zheng { 7608929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 7618929ecfaSYan, Zheng int updates; 76249b25e05SJeff Mahoney int err; 7638929ecfaSYan, Zheng 764a4abeea4SJosef Bacik smp_mb(); 7654a9d8bdeSMiao Xie if (cur_trans->state >= TRANS_STATE_BLOCKED || 7664a9d8bdeSMiao Xie cur_trans->delayed_refs.flushing) 7678929ecfaSYan, Zheng return 1; 7688929ecfaSYan, Zheng 7698929ecfaSYan, Zheng updates = trans->delayed_ref_updates; 7708929ecfaSYan, Zheng trans->delayed_ref_updates = 0; 77149b25e05SJeff Mahoney if (updates) { 77228ed1345SChris Mason err = btrfs_run_delayed_refs(trans, root, updates * 2); 77349b25e05SJeff Mahoney if (err) /* Error code will also eval true */ 77449b25e05SJeff Mahoney return err; 77549b25e05SJeff Mahoney } 7768929ecfaSYan, Zheng 7778929ecfaSYan, Zheng return should_end_transaction(trans, root); 7788929ecfaSYan, Zheng } 7798929ecfaSYan, Zheng 78089ce8a63SChris Mason static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, 781a698d075SMiao Xie struct btrfs_root *root, int throttle) 78279154b1bSChris Mason { 7838929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 784ab78c84dSChris Mason struct btrfs_fs_info *info = root->fs_info; 7851be41b78SJosef Bacik unsigned long cur = trans->delayed_ref_updates; 786a698d075SMiao Xie int lock = (trans->type != TRANS_JOIN_NOLOCK); 7874edc2ca3SDave Jones int err = 0; 788a79b7d4bSChris Mason int must_run_delayed_refs = 0; 789d6e4a428SChris Mason 7903bbb24b2SJosef Bacik if (trans->use_count > 1) { 7913bbb24b2SJosef Bacik trans->use_count--; 7922a1eb461SJosef Bacik trans->block_rsv = trans->orig_rsv; 7932a1eb461SJosef Bacik return 0; 7942a1eb461SJosef Bacik } 7952a1eb461SJosef Bacik 796b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 7974c13d758SJosef Bacik trans->block_rsv = NULL; 798c5567237SArne Jansen 799ea658badSJosef Bacik if (!list_empty(&trans->new_bgs)) 800ea658badSJosef Bacik btrfs_create_pending_block_groups(trans, root); 801ea658badSJosef Bacik 80250d9aa99SJosef Bacik if (!list_empty(&trans->ordered)) { 80350d9aa99SJosef Bacik spin_lock(&info->trans_lock); 804d3efe084SFilipe Manana list_splice_init(&trans->ordered, &cur_trans->pending_ordered); 80550d9aa99SJosef Bacik spin_unlock(&info->trans_lock); 80650d9aa99SJosef Bacik } 80750d9aa99SJosef Bacik 808c3e69d58SChris Mason trans->delayed_ref_updates = 0; 809a79b7d4bSChris Mason if (!trans->sync) { 810a79b7d4bSChris Mason must_run_delayed_refs = 811a79b7d4bSChris Mason btrfs_should_throttle_delayed_refs(trans, root); 8120a2b2a84SJosef Bacik cur = max_t(unsigned long, cur, 32); 813a79b7d4bSChris Mason 814a79b7d4bSChris Mason /* 815a79b7d4bSChris Mason * don't make the caller wait if they are from a NOLOCK 816a79b7d4bSChris Mason * or ATTACH transaction, it will deadlock with commit 817a79b7d4bSChris Mason */ 818a79b7d4bSChris Mason if (must_run_delayed_refs == 1 && 819a79b7d4bSChris Mason (trans->type & (__TRANS_JOIN_NOLOCK | __TRANS_ATTACH))) 820a79b7d4bSChris Mason must_run_delayed_refs = 2; 82156bec294SChris Mason } 822bb721703SChris Mason 823fcebe456SJosef Bacik if (trans->qgroup_reserved) { 824fcebe456SJosef Bacik /* 825fcebe456SJosef Bacik * the same root has to be passed here between start_transaction 826fcebe456SJosef Bacik * and end_transaction. Subvolume quota depends on this. 827fcebe456SJosef Bacik */ 828fcebe456SJosef Bacik btrfs_qgroup_free(trans->root, trans->qgroup_reserved); 829fcebe456SJosef Bacik trans->qgroup_reserved = 0; 830fcebe456SJosef Bacik } 831fcebe456SJosef Bacik 8320e721106SJosef Bacik btrfs_trans_release_metadata(trans, root); 8330e721106SJosef Bacik trans->block_rsv = NULL; 83456bec294SChris Mason 835ea658badSJosef Bacik if (!list_empty(&trans->new_bgs)) 836ea658badSJosef Bacik btrfs_create_pending_block_groups(trans, root); 837ea658badSJosef Bacik 8384fbcdf66SFilipe Manana btrfs_trans_release_chunk_metadata(trans); 8394fbcdf66SFilipe Manana 840a4abeea4SJosef Bacik if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && 8414a9d8bdeSMiao Xie should_end_transaction(trans, root) && 8424a9d8bdeSMiao Xie ACCESS_ONCE(cur_trans->state) == TRANS_STATE_RUNNING) { 8434a9d8bdeSMiao Xie spin_lock(&info->trans_lock); 8444a9d8bdeSMiao Xie if (cur_trans->state == TRANS_STATE_RUNNING) 8454a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_BLOCKED; 8464a9d8bdeSMiao Xie spin_unlock(&info->trans_lock); 847a4abeea4SJosef Bacik } 8488929ecfaSYan, Zheng 8494a9d8bdeSMiao Xie if (lock && ACCESS_ONCE(cur_trans->state) == TRANS_STATE_BLOCKED) { 8503bbb24b2SJosef Bacik if (throttle) 8518929ecfaSYan, Zheng return btrfs_commit_transaction(trans, root); 8523bbb24b2SJosef Bacik else 8538929ecfaSYan, Zheng wake_up_process(info->transaction_kthread); 8548929ecfaSYan, Zheng } 8558929ecfaSYan, Zheng 8560860adfdSMiao Xie if (trans->type & __TRANS_FREEZABLE) 8576df7881aSJosef Bacik sb_end_intwrite(root->fs_info->sb); 8586df7881aSJosef Bacik 8598929ecfaSYan, Zheng WARN_ON(cur_trans != info->running_transaction); 86013c5a93eSJosef Bacik WARN_ON(atomic_read(&cur_trans->num_writers) < 1); 86113c5a93eSJosef Bacik atomic_dec(&cur_trans->num_writers); 8620860adfdSMiao Xie extwriter_counter_dec(cur_trans, trans->type); 86389ce8a63SChris Mason 86499d16cbcSSage Weil smp_mb(); 86579154b1bSChris Mason if (waitqueue_active(&cur_trans->writer_wait)) 86679154b1bSChris Mason wake_up(&cur_trans->writer_wait); 867724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 8689ed74f2dSJosef Bacik 8699ed74f2dSJosef Bacik if (current->journal_info == trans) 8709ed74f2dSJosef Bacik current->journal_info = NULL; 871ab78c84dSChris Mason 87224bbcf04SYan, Zheng if (throttle) 87324bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 87424bbcf04SYan, Zheng 87549b25e05SJeff Mahoney if (trans->aborted || 8764e121c06SJosef Bacik test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { 8774e121c06SJosef Bacik wake_up_process(info->transaction_kthread); 8784edc2ca3SDave Jones err = -EIO; 8794e121c06SJosef Bacik } 880edf39272SJan Schmidt assert_qgroups_uptodate(trans); 88149b25e05SJeff Mahoney 8824edc2ca3SDave Jones kmem_cache_free(btrfs_trans_handle_cachep, trans); 883a79b7d4bSChris Mason if (must_run_delayed_refs) { 884a79b7d4bSChris Mason btrfs_async_run_delayed_refs(root, cur, 885a79b7d4bSChris Mason must_run_delayed_refs == 1); 886a79b7d4bSChris Mason } 8874edc2ca3SDave Jones return err; 88879154b1bSChris Mason } 88979154b1bSChris Mason 89089ce8a63SChris Mason int btrfs_end_transaction(struct btrfs_trans_handle *trans, 89189ce8a63SChris Mason struct btrfs_root *root) 89289ce8a63SChris Mason { 89398ad43beSWang Shilong return __btrfs_end_transaction(trans, root, 0); 89489ce8a63SChris Mason } 89589ce8a63SChris Mason 89689ce8a63SChris Mason int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 89789ce8a63SChris Mason struct btrfs_root *root) 89889ce8a63SChris Mason { 89998ad43beSWang Shilong return __btrfs_end_transaction(trans, root, 1); 90016cdcec7SMiao Xie } 90116cdcec7SMiao Xie 902d352ac68SChris Mason /* 903d352ac68SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 904d352ac68SChris Mason * them in one of two extent_io trees. This is used to make sure all of 905690587d1SChris Mason * those extents are sent to disk but does not wait on them 906d352ac68SChris Mason */ 907690587d1SChris Mason int btrfs_write_marked_extents(struct btrfs_root *root, 9088cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 90979154b1bSChris Mason { 910777e6bd7SChris Mason int err = 0; 9117c4452b9SChris Mason int werr = 0; 9121728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 913e6138876SJosef Bacik struct extent_state *cached_state = NULL; 914777e6bd7SChris Mason u64 start = 0; 9155f39d397SChris Mason u64 end; 9167c4452b9SChris Mason 9171728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 918e6138876SJosef Bacik mark, &cached_state)) { 919663dfbb0SFilipe Manana bool wait_writeback = false; 920663dfbb0SFilipe Manana 921663dfbb0SFilipe Manana err = convert_extent_bit(dirty_pages, start, end, 922663dfbb0SFilipe Manana EXTENT_NEED_WAIT, 923e6138876SJosef Bacik mark, &cached_state, GFP_NOFS); 924663dfbb0SFilipe Manana /* 925663dfbb0SFilipe Manana * convert_extent_bit can return -ENOMEM, which is most of the 926663dfbb0SFilipe Manana * time a temporary error. So when it happens, ignore the error 927663dfbb0SFilipe Manana * and wait for writeback of this range to finish - because we 928663dfbb0SFilipe Manana * failed to set the bit EXTENT_NEED_WAIT for the range, a call 929663dfbb0SFilipe Manana * to btrfs_wait_marked_extents() would not know that writeback 930663dfbb0SFilipe Manana * for this range started and therefore wouldn't wait for it to 931663dfbb0SFilipe Manana * finish - we don't want to commit a superblock that points to 932663dfbb0SFilipe Manana * btree nodes/leafs for which writeback hasn't finished yet 933663dfbb0SFilipe Manana * (and without errors). 934663dfbb0SFilipe Manana * We cleanup any entries left in the io tree when committing 935663dfbb0SFilipe Manana * the transaction (through clear_btree_io_tree()). 936663dfbb0SFilipe Manana */ 937663dfbb0SFilipe Manana if (err == -ENOMEM) { 938663dfbb0SFilipe Manana err = 0; 939663dfbb0SFilipe Manana wait_writeback = true; 940663dfbb0SFilipe Manana } 941663dfbb0SFilipe Manana if (!err) 9421728366eSJosef Bacik err = filemap_fdatawrite_range(mapping, start, end); 9437c4452b9SChris Mason if (err) 9447c4452b9SChris Mason werr = err; 945663dfbb0SFilipe Manana else if (wait_writeback) 946663dfbb0SFilipe Manana werr = filemap_fdatawait_range(mapping, start, end); 947e38e2ed7SFilipe Manana free_extent_state(cached_state); 948663dfbb0SFilipe Manana cached_state = NULL; 9491728366eSJosef Bacik cond_resched(); 9501728366eSJosef Bacik start = end + 1; 9517c4452b9SChris Mason } 952690587d1SChris Mason return werr; 953690587d1SChris Mason } 954690587d1SChris Mason 955690587d1SChris Mason /* 956690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 957690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 958690587d1SChris Mason * those extents are on disk for transaction or log commit. We wait 959690587d1SChris Mason * on all the pages and clear them from the dirty pages state tree 960690587d1SChris Mason */ 961690587d1SChris Mason int btrfs_wait_marked_extents(struct btrfs_root *root, 9628cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 963690587d1SChris Mason { 964690587d1SChris Mason int err = 0; 965690587d1SChris Mason int werr = 0; 9661728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 967e6138876SJosef Bacik struct extent_state *cached_state = NULL; 968690587d1SChris Mason u64 start = 0; 969690587d1SChris Mason u64 end; 970656f30dbSFilipe Manana struct btrfs_inode *btree_ino = BTRFS_I(root->fs_info->btree_inode); 971656f30dbSFilipe Manana bool errors = false; 972690587d1SChris Mason 9731728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 974e6138876SJosef Bacik EXTENT_NEED_WAIT, &cached_state)) { 975663dfbb0SFilipe Manana /* 976663dfbb0SFilipe Manana * Ignore -ENOMEM errors returned by clear_extent_bit(). 977663dfbb0SFilipe Manana * When committing the transaction, we'll remove any entries 978663dfbb0SFilipe Manana * left in the io tree. For a log commit, we don't remove them 979663dfbb0SFilipe Manana * after committing the log because the tree can be accessed 980663dfbb0SFilipe Manana * concurrently - we do it only at transaction commit time when 981663dfbb0SFilipe Manana * it's safe to do it (through clear_btree_io_tree()). 982663dfbb0SFilipe Manana */ 983663dfbb0SFilipe Manana err = clear_extent_bit(dirty_pages, start, end, 984663dfbb0SFilipe Manana EXTENT_NEED_WAIT, 985e6138876SJosef Bacik 0, 0, &cached_state, GFP_NOFS); 986663dfbb0SFilipe Manana if (err == -ENOMEM) 987663dfbb0SFilipe Manana err = 0; 988663dfbb0SFilipe Manana if (!err) 9891728366eSJosef Bacik err = filemap_fdatawait_range(mapping, start, end); 990777e6bd7SChris Mason if (err) 991777e6bd7SChris Mason werr = err; 992e38e2ed7SFilipe Manana free_extent_state(cached_state); 993e38e2ed7SFilipe Manana cached_state = NULL; 994777e6bd7SChris Mason cond_resched(); 9951728366eSJosef Bacik start = end + 1; 996777e6bd7SChris Mason } 9977c4452b9SChris Mason if (err) 9987c4452b9SChris Mason werr = err; 999656f30dbSFilipe Manana 1000656f30dbSFilipe Manana if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { 1001656f30dbSFilipe Manana if ((mark & EXTENT_DIRTY) && 1002656f30dbSFilipe Manana test_and_clear_bit(BTRFS_INODE_BTREE_LOG1_ERR, 1003656f30dbSFilipe Manana &btree_ino->runtime_flags)) 1004656f30dbSFilipe Manana errors = true; 1005656f30dbSFilipe Manana 1006656f30dbSFilipe Manana if ((mark & EXTENT_NEW) && 1007656f30dbSFilipe Manana test_and_clear_bit(BTRFS_INODE_BTREE_LOG2_ERR, 1008656f30dbSFilipe Manana &btree_ino->runtime_flags)) 1009656f30dbSFilipe Manana errors = true; 1010656f30dbSFilipe Manana } else { 1011656f30dbSFilipe Manana if (test_and_clear_bit(BTRFS_INODE_BTREE_ERR, 1012656f30dbSFilipe Manana &btree_ino->runtime_flags)) 1013656f30dbSFilipe Manana errors = true; 1014656f30dbSFilipe Manana } 1015656f30dbSFilipe Manana 1016656f30dbSFilipe Manana if (errors && !werr) 1017656f30dbSFilipe Manana werr = -EIO; 1018656f30dbSFilipe Manana 10197c4452b9SChris Mason return werr; 102079154b1bSChris Mason } 102179154b1bSChris Mason 1022690587d1SChris Mason /* 1023690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 1024690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 1025690587d1SChris Mason * those extents are on disk for transaction or log commit 1026690587d1SChris Mason */ 1027171170c1SSergei Trofimovich static int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, 10288cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 1029690587d1SChris Mason { 1030690587d1SChris Mason int ret; 1031690587d1SChris Mason int ret2; 1032c6adc9ccSMiao Xie struct blk_plug plug; 1033690587d1SChris Mason 1034c6adc9ccSMiao Xie blk_start_plug(&plug); 10358cef4e16SYan, Zheng ret = btrfs_write_marked_extents(root, dirty_pages, mark); 1036c6adc9ccSMiao Xie blk_finish_plug(&plug); 10378cef4e16SYan, Zheng ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); 1038bf0da8c1SChris Mason 1039bf0da8c1SChris Mason if (ret) 1040bf0da8c1SChris Mason return ret; 1041bf0da8c1SChris Mason if (ret2) 1042bf0da8c1SChris Mason return ret2; 1043bf0da8c1SChris Mason return 0; 1044690587d1SChris Mason } 1045690587d1SChris Mason 1046663dfbb0SFilipe Manana static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, 1047d0c803c4SChris Mason struct btrfs_root *root) 1048d0c803c4SChris Mason { 1049663dfbb0SFilipe Manana int ret; 1050663dfbb0SFilipe Manana 1051663dfbb0SFilipe Manana ret = btrfs_write_and_wait_marked_extents(root, 10528cef4e16SYan, Zheng &trans->transaction->dirty_pages, 10538cef4e16SYan, Zheng EXTENT_DIRTY); 1054663dfbb0SFilipe Manana clear_btree_io_tree(&trans->transaction->dirty_pages); 1055663dfbb0SFilipe Manana 1056663dfbb0SFilipe Manana return ret; 1057d0c803c4SChris Mason } 1058d0c803c4SChris Mason 1059d352ac68SChris Mason /* 1060d352ac68SChris Mason * this is used to update the root pointer in the tree of tree roots. 1061d352ac68SChris Mason * 1062d352ac68SChris Mason * But, in the case of the extent allocation tree, updating the root 1063d352ac68SChris Mason * pointer may allocate blocks which may change the root of the extent 1064d352ac68SChris Mason * allocation tree. 1065d352ac68SChris Mason * 1066d352ac68SChris Mason * So, this loops and repeats and makes sure the cowonly root didn't 1067d352ac68SChris Mason * change while the root pointer was being updated in the metadata. 1068d352ac68SChris Mason */ 10690b86a832SChris Mason static int update_cowonly_root(struct btrfs_trans_handle *trans, 107079154b1bSChris Mason struct btrfs_root *root) 107179154b1bSChris Mason { 107279154b1bSChris Mason int ret; 10730b86a832SChris Mason u64 old_root_bytenr; 107486b9f2ecSYan, Zheng u64 old_root_used; 10750b86a832SChris Mason struct btrfs_root *tree_root = root->fs_info->tree_root; 107679154b1bSChris Mason 107786b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 107856bec294SChris Mason 107979154b1bSChris Mason while (1) { 10800b86a832SChris Mason old_root_bytenr = btrfs_root_bytenr(&root->root_item); 108186b9f2ecSYan, Zheng if (old_root_bytenr == root->node->start && 1082ea526d18SJosef Bacik old_root_used == btrfs_root_used(&root->root_item)) 108379154b1bSChris Mason break; 108487ef2bb4SChris Mason 10855d4f98a2SYan Zheng btrfs_set_root_node(&root->root_item, root->node); 108679154b1bSChris Mason ret = btrfs_update_root(trans, tree_root, 10870b86a832SChris Mason &root->root_key, 10880b86a832SChris Mason &root->root_item); 108949b25e05SJeff Mahoney if (ret) 109049b25e05SJeff Mahoney return ret; 109156bec294SChris Mason 109286b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 1093e7070be1SJosef Bacik } 1094276e680dSYan Zheng 10950b86a832SChris Mason return 0; 10960b86a832SChris Mason } 10970b86a832SChris Mason 1098d352ac68SChris Mason /* 1099d352ac68SChris Mason * update all the cowonly tree roots on disk 110049b25e05SJeff Mahoney * 110149b25e05SJeff Mahoney * The error handling in this function may not be obvious. Any of the 110249b25e05SJeff Mahoney * failures will cause the file system to go offline. We still need 110349b25e05SJeff Mahoney * to clean up the delayed refs. 1104d352ac68SChris Mason */ 11055d4f98a2SYan Zheng static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, 11060b86a832SChris Mason struct btrfs_root *root) 11070b86a832SChris Mason { 11080b86a832SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 1109ea526d18SJosef Bacik struct list_head *dirty_bgs = &trans->transaction->dirty_bgs; 11101bbc621eSChris Mason struct list_head *io_bgs = &trans->transaction->io_bgs; 11110b86a832SChris Mason struct list_head *next; 111284234f3aSYan Zheng struct extent_buffer *eb; 111356bec294SChris Mason int ret; 111484234f3aSYan Zheng 111584234f3aSYan Zheng eb = btrfs_lock_root_node(fs_info->tree_root); 111649b25e05SJeff Mahoney ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 111749b25e05SJeff Mahoney 0, &eb); 111884234f3aSYan Zheng btrfs_tree_unlock(eb); 111984234f3aSYan Zheng free_extent_buffer(eb); 11200b86a832SChris Mason 112149b25e05SJeff Mahoney if (ret) 112249b25e05SJeff Mahoney return ret; 112349b25e05SJeff Mahoney 112456bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 112549b25e05SJeff Mahoney if (ret) 112649b25e05SJeff Mahoney return ret; 112787ef2bb4SChris Mason 1128733f4fbbSStefan Behrens ret = btrfs_run_dev_stats(trans, root->fs_info); 1129c16ce190SJosef Bacik if (ret) 1130c16ce190SJosef Bacik return ret; 11318dabb742SStefan Behrens ret = btrfs_run_dev_replace(trans, root->fs_info); 1132c16ce190SJosef Bacik if (ret) 1133c16ce190SJosef Bacik return ret; 1134546adb0dSJan Schmidt ret = btrfs_run_qgroups(trans, root->fs_info); 1135c16ce190SJosef Bacik if (ret) 1136c16ce190SJosef Bacik return ret; 1137546adb0dSJan Schmidt 1138dcdf7f6dSJosef Bacik ret = btrfs_setup_space_cache(trans, root); 1139dcdf7f6dSJosef Bacik if (ret) 1140dcdf7f6dSJosef Bacik return ret; 1141dcdf7f6dSJosef Bacik 1142546adb0dSJan Schmidt /* run_qgroups might have added some more refs */ 1143546adb0dSJan Schmidt ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 1144c16ce190SJosef Bacik if (ret) 1145c16ce190SJosef Bacik return ret; 1146ea526d18SJosef Bacik again: 11470b86a832SChris Mason while (!list_empty(&fs_info->dirty_cowonly_roots)) { 11480b86a832SChris Mason next = fs_info->dirty_cowonly_roots.next; 11490b86a832SChris Mason list_del_init(next); 11500b86a832SChris Mason root = list_entry(next, struct btrfs_root, dirty_list); 1151e7070be1SJosef Bacik clear_bit(BTRFS_ROOT_DIRTY, &root->state); 115287ef2bb4SChris Mason 11539e351cc8SJosef Bacik if (root != fs_info->extent_root) 11549e351cc8SJosef Bacik list_add_tail(&root->dirty_list, 11559e351cc8SJosef Bacik &trans->transaction->switch_commits); 115649b25e05SJeff Mahoney ret = update_cowonly_root(trans, root); 115749b25e05SJeff Mahoney if (ret) 115849b25e05SJeff Mahoney return ret; 1159ea526d18SJosef Bacik ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 1160ea526d18SJosef Bacik if (ret) 1161ea526d18SJosef Bacik return ret; 116279154b1bSChris Mason } 1163276e680dSYan Zheng 11641bbc621eSChris Mason while (!list_empty(dirty_bgs) || !list_empty(io_bgs)) { 1165ea526d18SJosef Bacik ret = btrfs_write_dirty_block_groups(trans, root); 1166ea526d18SJosef Bacik if (ret) 1167ea526d18SJosef Bacik return ret; 1168ea526d18SJosef Bacik ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 1169ea526d18SJosef Bacik if (ret) 1170ea526d18SJosef Bacik return ret; 1171ea526d18SJosef Bacik } 1172ea526d18SJosef Bacik 1173ea526d18SJosef Bacik if (!list_empty(&fs_info->dirty_cowonly_roots)) 1174ea526d18SJosef Bacik goto again; 1175ea526d18SJosef Bacik 11769e351cc8SJosef Bacik list_add_tail(&fs_info->extent_root->dirty_list, 11779e351cc8SJosef Bacik &trans->transaction->switch_commits); 11788dabb742SStefan Behrens btrfs_after_dev_replace_commit(fs_info); 11798dabb742SStefan Behrens 118079154b1bSChris Mason return 0; 118179154b1bSChris Mason } 118279154b1bSChris Mason 1183d352ac68SChris Mason /* 1184d352ac68SChris Mason * dead roots are old snapshots that need to be deleted. This allocates 1185d352ac68SChris Mason * a dirty root struct and adds it into the list of dead roots that need to 1186d352ac68SChris Mason * be deleted 1187d352ac68SChris Mason */ 1188cfad392bSJosef Bacik void btrfs_add_dead_root(struct btrfs_root *root) 11895eda7b5eSChris Mason { 1190a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1191cfad392bSJosef Bacik if (list_empty(&root->root_list)) 11929d1a2a3aSDavid Sterba list_add_tail(&root->root_list, &root->fs_info->dead_roots); 1193a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 11945eda7b5eSChris Mason } 11955eda7b5eSChris Mason 1196d352ac68SChris Mason /* 11975d4f98a2SYan Zheng * update all the cowonly tree roots on disk 1198d352ac68SChris Mason */ 11995d4f98a2SYan Zheng static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, 12005d4f98a2SYan Zheng struct btrfs_root *root) 12010f7d52f4SChris Mason { 12020f7d52f4SChris Mason struct btrfs_root *gang[8]; 12035d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 12040f7d52f4SChris Mason int i; 12050f7d52f4SChris Mason int ret; 120654aa1f4dSChris Mason int err = 0; 120754aa1f4dSChris Mason 1208a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 12090f7d52f4SChris Mason while (1) { 12105d4f98a2SYan Zheng ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, 12115d4f98a2SYan Zheng (void **)gang, 0, 12120f7d52f4SChris Mason ARRAY_SIZE(gang), 12130f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 12140f7d52f4SChris Mason if (ret == 0) 12150f7d52f4SChris Mason break; 12160f7d52f4SChris Mason for (i = 0; i < ret; i++) { 12170f7d52f4SChris Mason root = gang[i]; 12185d4f98a2SYan Zheng radix_tree_tag_clear(&fs_info->fs_roots_radix, 12192619ba1fSChris Mason (unsigned long)root->root_key.objectid, 12200f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 1221a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 122231153d81SYan Zheng 1223e02119d5SChris Mason btrfs_free_log(trans, root); 12245d4f98a2SYan Zheng btrfs_update_reloc_root(trans, root); 1225d68fc57bSYan, Zheng btrfs_orphan_commit_root(trans, root); 1226e02119d5SChris Mason 122782d5902dSLi Zefan btrfs_save_ino_cache(root, trans); 122882d5902dSLi Zefan 1229f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 123027cdeb70SMiao Xie clear_bit(BTRFS_ROOT_FORCE_COW, &root->state); 1231c7548af6SChris Mason smp_mb__after_atomic(); 1232f1ebcc74SLiu Bo 1233978d910dSYan Zheng if (root->commit_root != root->node) { 12349e351cc8SJosef Bacik list_add_tail(&root->dirty_list, 12359e351cc8SJosef Bacik &trans->transaction->switch_commits); 1236978d910dSYan Zheng btrfs_set_root_node(&root->root_item, 1237978d910dSYan Zheng root->node); 1238978d910dSYan Zheng } 123931153d81SYan Zheng 12405d4f98a2SYan Zheng err = btrfs_update_root(trans, fs_info->tree_root, 12410f7d52f4SChris Mason &root->root_key, 12420f7d52f4SChris Mason &root->root_item); 1243a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 124454aa1f4dSChris Mason if (err) 124554aa1f4dSChris Mason break; 12460f7d52f4SChris Mason } 12479f3a7427SChris Mason } 1248a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 124954aa1f4dSChris Mason return err; 12500f7d52f4SChris Mason } 12510f7d52f4SChris Mason 1252d352ac68SChris Mason /* 1253de78b51aSEric Sandeen * defrag a given btree. 1254de78b51aSEric Sandeen * Every leaf in the btree is read and defragged. 1255d352ac68SChris Mason */ 1256de78b51aSEric Sandeen int btrfs_defrag_root(struct btrfs_root *root) 1257e9d0b13bSChris Mason { 1258e9d0b13bSChris Mason struct btrfs_fs_info *info = root->fs_info; 1259e9d0b13bSChris Mason struct btrfs_trans_handle *trans; 12608929ecfaSYan, Zheng int ret; 1261e9d0b13bSChris Mason 126227cdeb70SMiao Xie if (test_and_set_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state)) 1263e9d0b13bSChris Mason return 0; 12648929ecfaSYan, Zheng 12656b80053dSChris Mason while (1) { 12668929ecfaSYan, Zheng trans = btrfs_start_transaction(root, 0); 12678929ecfaSYan, Zheng if (IS_ERR(trans)) 12688929ecfaSYan, Zheng return PTR_ERR(trans); 12698929ecfaSYan, Zheng 1270de78b51aSEric Sandeen ret = btrfs_defrag_leaves(trans, root); 12718929ecfaSYan, Zheng 1272e9d0b13bSChris Mason btrfs_end_transaction(trans, root); 1273b53d3f5dSLiu Bo btrfs_btree_balance_dirty(info->tree_root); 1274e9d0b13bSChris Mason cond_resched(); 1275e9d0b13bSChris Mason 12767841cb28SDavid Sterba if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) 1277e9d0b13bSChris Mason break; 1278210549ebSDavid Sterba 1279210549ebSDavid Sterba if (btrfs_defrag_cancelled(root->fs_info)) { 1280efe120a0SFrank Holton pr_debug("BTRFS: defrag_root cancelled\n"); 1281210549ebSDavid Sterba ret = -EAGAIN; 1282210549ebSDavid Sterba break; 1283210549ebSDavid Sterba } 1284e9d0b13bSChris Mason } 128527cdeb70SMiao Xie clear_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state); 12868929ecfaSYan, Zheng return ret; 1287e9d0b13bSChris Mason } 1288e9d0b13bSChris Mason 1289d352ac68SChris Mason /* 1290d352ac68SChris Mason * new snapshots need to be created at a very specific time in the 1291aec8030aSMiao Xie * transaction commit. This does the actual creation. 1292aec8030aSMiao Xie * 1293aec8030aSMiao Xie * Note: 1294aec8030aSMiao Xie * If the error which may affect the commitment of the current transaction 1295aec8030aSMiao Xie * happens, we should return the error number. If the error which just affect 1296aec8030aSMiao Xie * the creation of the pending snapshots, just return 0. 1297d352ac68SChris Mason */ 129880b6794dSChris Mason static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, 12993063d29fSChris Mason struct btrfs_fs_info *fs_info, 13003063d29fSChris Mason struct btrfs_pending_snapshot *pending) 13013063d29fSChris Mason { 13023063d29fSChris Mason struct btrfs_key key; 130380b6794dSChris Mason struct btrfs_root_item *new_root_item; 13043063d29fSChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 13053063d29fSChris Mason struct btrfs_root *root = pending->root; 13066bdb72deSSage Weil struct btrfs_root *parent_root; 130798c9942aSLiu Bo struct btrfs_block_rsv *rsv; 13086bdb72deSSage Weil struct inode *parent_inode; 130942874b3dSMiao Xie struct btrfs_path *path; 131042874b3dSMiao Xie struct btrfs_dir_item *dir_item; 1311a22285a6SYan, Zheng struct dentry *dentry; 13123063d29fSChris Mason struct extent_buffer *tmp; 1313925baeddSChris Mason struct extent_buffer *old; 13148ea05e3aSAlexander Block struct timespec cur_time = CURRENT_TIME; 1315aec8030aSMiao Xie int ret = 0; 1316d68fc57bSYan, Zheng u64 to_reserve = 0; 13176bdb72deSSage Weil u64 index = 0; 1318a22285a6SYan, Zheng u64 objectid; 1319b83cc969SLi Zefan u64 root_flags; 13208ea05e3aSAlexander Block uuid_le new_uuid; 13213063d29fSChris Mason 132242874b3dSMiao Xie path = btrfs_alloc_path(); 132342874b3dSMiao Xie if (!path) { 1324aec8030aSMiao Xie pending->error = -ENOMEM; 1325aec8030aSMiao Xie return 0; 132642874b3dSMiao Xie } 132742874b3dSMiao Xie 132880b6794dSChris Mason new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); 132980b6794dSChris Mason if (!new_root_item) { 1330aec8030aSMiao Xie pending->error = -ENOMEM; 13316fa9700eSMiao Xie goto root_item_alloc_fail; 133280b6794dSChris Mason } 1333a22285a6SYan, Zheng 1334aec8030aSMiao Xie pending->error = btrfs_find_free_objectid(tree_root, &objectid); 1335aec8030aSMiao Xie if (pending->error) 13366fa9700eSMiao Xie goto no_free_objectid; 13373063d29fSChris Mason 1338d6726335SQu Wenruo /* 1339d6726335SQu Wenruo * Make qgroup to skip current new snapshot's qgroupid, as it is 1340d6726335SQu Wenruo * accounted by later btrfs_qgroup_inherit(). 1341d6726335SQu Wenruo */ 1342d6726335SQu Wenruo btrfs_set_skip_qgroup(trans, objectid); 1343d6726335SQu Wenruo 1344147d256eSZhaolei btrfs_reloc_pre_snapshot(pending, &to_reserve); 1345d68fc57bSYan, Zheng 1346d68fc57bSYan, Zheng if (to_reserve > 0) { 1347aec8030aSMiao Xie pending->error = btrfs_block_rsv_add(root, 1348aec8030aSMiao Xie &pending->block_rsv, 134908e007d2SMiao Xie to_reserve, 135008e007d2SMiao Xie BTRFS_RESERVE_NO_FLUSH); 1351aec8030aSMiao Xie if (pending->error) 1352d6726335SQu Wenruo goto clear_skip_qgroup; 1353d68fc57bSYan, Zheng } 1354d68fc57bSYan, Zheng 13553063d29fSChris Mason key.objectid = objectid; 1356a22285a6SYan, Zheng key.offset = (u64)-1; 1357a22285a6SYan, Zheng key.type = BTRFS_ROOT_ITEM_KEY; 13583063d29fSChris Mason 13596fa9700eSMiao Xie rsv = trans->block_rsv; 1360a22285a6SYan, Zheng trans->block_rsv = &pending->block_rsv; 13612382c5ccSLiu Bo trans->bytes_reserved = trans->block_rsv->reserved; 13626bdb72deSSage Weil 1363a22285a6SYan, Zheng dentry = pending->dentry; 1364e9662f70SMiao Xie parent_inode = pending->dir; 1365a22285a6SYan, Zheng parent_root = BTRFS_I(parent_inode)->root; 13667585717fSChris Mason record_root_in_trans(trans, parent_root); 1367a22285a6SYan, Zheng 13686bdb72deSSage Weil /* 13696bdb72deSSage Weil * insert the directory item 13706bdb72deSSage Weil */ 13716bdb72deSSage Weil ret = btrfs_set_inode_index(parent_inode, &index); 137249b25e05SJeff Mahoney BUG_ON(ret); /* -ENOMEM */ 137342874b3dSMiao Xie 137442874b3dSMiao Xie /* check if there is a file/dir which has the same name. */ 137542874b3dSMiao Xie dir_item = btrfs_lookup_dir_item(NULL, parent_root, path, 137642874b3dSMiao Xie btrfs_ino(parent_inode), 137742874b3dSMiao Xie dentry->d_name.name, 137842874b3dSMiao Xie dentry->d_name.len, 0); 137942874b3dSMiao Xie if (dir_item != NULL && !IS_ERR(dir_item)) { 1380fe66a05aSChris Mason pending->error = -EEXIST; 1381aec8030aSMiao Xie goto dir_item_existed; 138242874b3dSMiao Xie } else if (IS_ERR(dir_item)) { 138342874b3dSMiao Xie ret = PTR_ERR(dir_item); 13848732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 13858732d44fSMiao Xie goto fail; 138679787eaaSJeff Mahoney } 138742874b3dSMiao Xie btrfs_release_path(path); 13886bdb72deSSage Weil 1389e999376fSChris Mason /* 1390e999376fSChris Mason * pull in the delayed directory update 1391e999376fSChris Mason * and the delayed inode item 1392e999376fSChris Mason * otherwise we corrupt the FS during 1393e999376fSChris Mason * snapshot 1394e999376fSChris Mason */ 1395e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 13968732d44fSMiao Xie if (ret) { /* Transaction aborted */ 13978732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 13988732d44fSMiao Xie goto fail; 13998732d44fSMiao Xie } 1400e999376fSChris Mason 14017585717fSChris Mason record_root_in_trans(trans, root); 14026bdb72deSSage Weil btrfs_set_root_last_snapshot(&root->root_item, trans->transid); 14036bdb72deSSage Weil memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); 140408fe4db1SLi Zefan btrfs_check_and_init_root_item(new_root_item); 14056bdb72deSSage Weil 1406b83cc969SLi Zefan root_flags = btrfs_root_flags(new_root_item); 1407b83cc969SLi Zefan if (pending->readonly) 1408b83cc969SLi Zefan root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; 1409b83cc969SLi Zefan else 1410b83cc969SLi Zefan root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; 1411b83cc969SLi Zefan btrfs_set_root_flags(new_root_item, root_flags); 1412b83cc969SLi Zefan 14138ea05e3aSAlexander Block btrfs_set_root_generation_v2(new_root_item, 14148ea05e3aSAlexander Block trans->transid); 14158ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 14168ea05e3aSAlexander Block memcpy(new_root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); 14178ea05e3aSAlexander Block memcpy(new_root_item->parent_uuid, root->root_item.uuid, 14188ea05e3aSAlexander Block BTRFS_UUID_SIZE); 141970023da2SStefan Behrens if (!(root_flags & BTRFS_ROOT_SUBVOL_RDONLY)) { 142070023da2SStefan Behrens memset(new_root_item->received_uuid, 0, 142170023da2SStefan Behrens sizeof(new_root_item->received_uuid)); 14228ea05e3aSAlexander Block memset(&new_root_item->stime, 0, sizeof(new_root_item->stime)); 14238ea05e3aSAlexander Block memset(&new_root_item->rtime, 0, sizeof(new_root_item->rtime)); 14248ea05e3aSAlexander Block btrfs_set_root_stransid(new_root_item, 0); 14258ea05e3aSAlexander Block btrfs_set_root_rtransid(new_root_item, 0); 142670023da2SStefan Behrens } 14273cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&new_root_item->otime, cur_time.tv_sec); 14283cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&new_root_item->otime, cur_time.tv_nsec); 142970023da2SStefan Behrens btrfs_set_root_otransid(new_root_item, trans->transid); 14308ea05e3aSAlexander Block 1431925baeddSChris Mason old = btrfs_lock_root_node(root); 143249b25e05SJeff Mahoney ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); 143379787eaaSJeff Mahoney if (ret) { 143479787eaaSJeff Mahoney btrfs_tree_unlock(old); 143579787eaaSJeff Mahoney free_extent_buffer(old); 14368732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14378732d44fSMiao Xie goto fail; 143879787eaaSJeff Mahoney } 143949b25e05SJeff Mahoney 14405d4f98a2SYan Zheng btrfs_set_lock_blocking(old); 14413063d29fSChris Mason 144249b25e05SJeff Mahoney ret = btrfs_copy_root(trans, root, old, &tmp, objectid); 144379787eaaSJeff Mahoney /* clean up in any case */ 1444925baeddSChris Mason btrfs_tree_unlock(old); 1445925baeddSChris Mason free_extent_buffer(old); 14468732d44fSMiao Xie if (ret) { 14478732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14488732d44fSMiao Xie goto fail; 14498732d44fSMiao Xie } 1450f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 145127cdeb70SMiao Xie set_bit(BTRFS_ROOT_FORCE_COW, &root->state); 1452f1ebcc74SLiu Bo smp_wmb(); 1453f1ebcc74SLiu Bo 14545d4f98a2SYan Zheng btrfs_set_root_node(new_root_item, tmp); 1455a22285a6SYan, Zheng /* record when the snapshot was created in key.offset */ 1456a22285a6SYan, Zheng key.offset = trans->transid; 1457a22285a6SYan, Zheng ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); 1458925baeddSChris Mason btrfs_tree_unlock(tmp); 14593063d29fSChris Mason free_extent_buffer(tmp); 14608732d44fSMiao Xie if (ret) { 14618732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14628732d44fSMiao Xie goto fail; 14638732d44fSMiao Xie } 14640660b5afSChris Mason 1465a22285a6SYan, Zheng /* 1466a22285a6SYan, Zheng * insert root back/forward references 1467a22285a6SYan, Zheng */ 1468a22285a6SYan, Zheng ret = btrfs_add_root_ref(trans, tree_root, objectid, 1469a22285a6SYan, Zheng parent_root->root_key.objectid, 147033345d01SLi Zefan btrfs_ino(parent_inode), index, 1471a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len); 14728732d44fSMiao Xie if (ret) { 14738732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14748732d44fSMiao Xie goto fail; 14758732d44fSMiao Xie } 1476a22285a6SYan, Zheng 1477a22285a6SYan, Zheng key.offset = (u64)-1; 1478a22285a6SYan, Zheng pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); 147979787eaaSJeff Mahoney if (IS_ERR(pending->snap)) { 148079787eaaSJeff Mahoney ret = PTR_ERR(pending->snap); 14818732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14828732d44fSMiao Xie goto fail; 148379787eaaSJeff Mahoney } 1484d68fc57bSYan, Zheng 148549b25e05SJeff Mahoney ret = btrfs_reloc_post_snapshot(trans, pending); 14868732d44fSMiao Xie if (ret) { 14878732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14888732d44fSMiao Xie goto fail; 14898732d44fSMiao Xie } 1490361048f5SMiao Xie 1491361048f5SMiao Xie ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 14928732d44fSMiao Xie if (ret) { 14938732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 14948732d44fSMiao Xie goto fail; 14958732d44fSMiao Xie } 149642874b3dSMiao Xie 149742874b3dSMiao Xie ret = btrfs_insert_dir_item(trans, parent_root, 149842874b3dSMiao Xie dentry->d_name.name, dentry->d_name.len, 149942874b3dSMiao Xie parent_inode, &key, 150042874b3dSMiao Xie BTRFS_FT_DIR, index); 150142874b3dSMiao Xie /* We have check then name at the beginning, so it is impossible. */ 15029c52057cSChris Mason BUG_ON(ret == -EEXIST || ret == -EOVERFLOW); 15038732d44fSMiao Xie if (ret) { 15048732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 15058732d44fSMiao Xie goto fail; 15068732d44fSMiao Xie } 150742874b3dSMiao Xie 150842874b3dSMiao Xie btrfs_i_size_write(parent_inode, parent_inode->i_size + 150942874b3dSMiao Xie dentry->d_name.len * 2); 151042874b3dSMiao Xie parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; 1511be6aef60SJosef Bacik ret = btrfs_update_inode_fallback(trans, parent_root, parent_inode); 1512dd5f9615SStefan Behrens if (ret) { 15138732d44fSMiao Xie btrfs_abort_transaction(trans, root, ret); 1514dd5f9615SStefan Behrens goto fail; 1515dd5f9615SStefan Behrens } 1516dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, new_uuid.b, 1517dd5f9615SStefan Behrens BTRFS_UUID_KEY_SUBVOL, objectid); 1518dd5f9615SStefan Behrens if (ret) { 1519dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 1520dd5f9615SStefan Behrens goto fail; 1521dd5f9615SStefan Behrens } 1522dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(new_root_item->received_uuid)) { 1523dd5f9615SStefan Behrens ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, 1524dd5f9615SStefan Behrens new_root_item->received_uuid, 1525dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 1526dd5f9615SStefan Behrens objectid); 1527dd5f9615SStefan Behrens if (ret && ret != -EEXIST) { 1528dd5f9615SStefan Behrens btrfs_abort_transaction(trans, root, ret); 1529dd5f9615SStefan Behrens goto fail; 1530dd5f9615SStefan Behrens } 1531dd5f9615SStefan Behrens } 1532d6726335SQu Wenruo 1533d6726335SQu Wenruo ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 1534d6726335SQu Wenruo if (ret) { 1535d6726335SQu Wenruo btrfs_abort_transaction(trans, root, ret); 1536d6726335SQu Wenruo goto fail; 1537d6726335SQu Wenruo } 1538d6726335SQu Wenruo 1539d6726335SQu Wenruo /* 1540d6726335SQu Wenruo * account qgroup counters before qgroup_inherit() 1541d6726335SQu Wenruo */ 1542d6726335SQu Wenruo ret = btrfs_qgroup_prepare_account_extents(trans, fs_info); 1543d6726335SQu Wenruo if (ret) 1544d6726335SQu Wenruo goto fail; 1545d6726335SQu Wenruo ret = btrfs_qgroup_account_extents(trans, fs_info); 1546d6726335SQu Wenruo if (ret) 1547d6726335SQu Wenruo goto fail; 1548d6726335SQu Wenruo ret = btrfs_qgroup_inherit(trans, fs_info, 1549d6726335SQu Wenruo root->root_key.objectid, 1550d6726335SQu Wenruo objectid, pending->inherit); 1551d6726335SQu Wenruo if (ret) { 1552d6726335SQu Wenruo btrfs_abort_transaction(trans, root, ret); 1553d6726335SQu Wenruo goto fail; 1554d6726335SQu Wenruo } 1555d6726335SQu Wenruo 15563063d29fSChris Mason fail: 1557aec8030aSMiao Xie pending->error = ret; 1558aec8030aSMiao Xie dir_item_existed: 155998c9942aSLiu Bo trans->block_rsv = rsv; 15602382c5ccSLiu Bo trans->bytes_reserved = 0; 1561d6726335SQu Wenruo clear_skip_qgroup: 1562d6726335SQu Wenruo btrfs_clear_skip_qgroup(trans); 15636fa9700eSMiao Xie no_free_objectid: 15646fa9700eSMiao Xie kfree(new_root_item); 15656fa9700eSMiao Xie root_item_alloc_fail: 156642874b3dSMiao Xie btrfs_free_path(path); 156749b25e05SJeff Mahoney return ret; 15683063d29fSChris Mason } 15693063d29fSChris Mason 1570d352ac68SChris Mason /* 1571d352ac68SChris Mason * create all the snapshots we've scheduled for creation 1572d352ac68SChris Mason */ 157380b6794dSChris Mason static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, 15743063d29fSChris Mason struct btrfs_fs_info *fs_info) 15753063d29fSChris Mason { 1576aec8030aSMiao Xie struct btrfs_pending_snapshot *pending, *next; 15773063d29fSChris Mason struct list_head *head = &trans->transaction->pending_snapshots; 1578aec8030aSMiao Xie int ret = 0; 15793de4586cSChris Mason 1580aec8030aSMiao Xie list_for_each_entry_safe(pending, next, head, list) { 1581aec8030aSMiao Xie list_del(&pending->list); 1582aec8030aSMiao Xie ret = create_pending_snapshot(trans, fs_info, pending); 1583aec8030aSMiao Xie if (ret) 1584aec8030aSMiao Xie break; 1585aec8030aSMiao Xie } 1586aec8030aSMiao Xie return ret; 15873de4586cSChris Mason } 15883de4586cSChris Mason 15895d4f98a2SYan Zheng static void update_super_roots(struct btrfs_root *root) 15905d4f98a2SYan Zheng { 15915d4f98a2SYan Zheng struct btrfs_root_item *root_item; 15925d4f98a2SYan Zheng struct btrfs_super_block *super; 15935d4f98a2SYan Zheng 15946c41761fSDavid Sterba super = root->fs_info->super_copy; 15955d4f98a2SYan Zheng 15965d4f98a2SYan Zheng root_item = &root->fs_info->chunk_root->root_item; 15975d4f98a2SYan Zheng super->chunk_root = root_item->bytenr; 15985d4f98a2SYan Zheng super->chunk_root_generation = root_item->generation; 15995d4f98a2SYan Zheng super->chunk_root_level = root_item->level; 16005d4f98a2SYan Zheng 16015d4f98a2SYan Zheng root_item = &root->fs_info->tree_root->root_item; 16025d4f98a2SYan Zheng super->root = root_item->bytenr; 16035d4f98a2SYan Zheng super->generation = root_item->generation; 16045d4f98a2SYan Zheng super->root_level = root_item->level; 160573bc1876SJosef Bacik if (btrfs_test_opt(root, SPACE_CACHE)) 16060af3d00bSJosef Bacik super->cache_generation = root_item->generation; 160770f80175SStefan Behrens if (root->fs_info->update_uuid_tree_gen) 160826432799SStefan Behrens super->uuid_tree_generation = root_item->generation; 16095d4f98a2SYan Zheng } 16105d4f98a2SYan Zheng 1611f36f3042SChris Mason int btrfs_transaction_in_commit(struct btrfs_fs_info *info) 1612f36f3042SChris Mason { 16134a9d8bdeSMiao Xie struct btrfs_transaction *trans; 1614f36f3042SChris Mason int ret = 0; 16154a9d8bdeSMiao Xie 1616a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 16174a9d8bdeSMiao Xie trans = info->running_transaction; 16184a9d8bdeSMiao Xie if (trans) 16194a9d8bdeSMiao Xie ret = (trans->state >= TRANS_STATE_COMMIT_START); 1620a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 1621f36f3042SChris Mason return ret; 1622f36f3042SChris Mason } 1623f36f3042SChris Mason 16248929ecfaSYan, Zheng int btrfs_transaction_blocked(struct btrfs_fs_info *info) 16258929ecfaSYan, Zheng { 16264a9d8bdeSMiao Xie struct btrfs_transaction *trans; 16278929ecfaSYan, Zheng int ret = 0; 16284a9d8bdeSMiao Xie 1629a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 16304a9d8bdeSMiao Xie trans = info->running_transaction; 16314a9d8bdeSMiao Xie if (trans) 16324a9d8bdeSMiao Xie ret = is_transaction_blocked(trans); 1633a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 16348929ecfaSYan, Zheng return ret; 16358929ecfaSYan, Zheng } 16368929ecfaSYan, Zheng 1637bb9c12c9SSage Weil /* 1638bb9c12c9SSage Weil * wait for the current transaction commit to start and block subsequent 1639bb9c12c9SSage Weil * transaction joins 1640bb9c12c9SSage Weil */ 1641bb9c12c9SSage Weil static void wait_current_trans_commit_start(struct btrfs_root *root, 1642bb9c12c9SSage Weil struct btrfs_transaction *trans) 1643bb9c12c9SSage Weil { 16444a9d8bdeSMiao Xie wait_event(root->fs_info->transaction_blocked_wait, 1645501407aaSJosef Bacik trans->state >= TRANS_STATE_COMMIT_START || 1646501407aaSJosef Bacik trans->aborted); 1647bb9c12c9SSage Weil } 1648bb9c12c9SSage Weil 1649bb9c12c9SSage Weil /* 1650bb9c12c9SSage Weil * wait for the current transaction to start and then become unblocked. 1651bb9c12c9SSage Weil * caller holds ref. 1652bb9c12c9SSage Weil */ 1653bb9c12c9SSage Weil static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, 1654bb9c12c9SSage Weil struct btrfs_transaction *trans) 1655bb9c12c9SSage Weil { 165672d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 1657501407aaSJosef Bacik trans->state >= TRANS_STATE_UNBLOCKED || 1658501407aaSJosef Bacik trans->aborted); 1659bb9c12c9SSage Weil } 1660bb9c12c9SSage Weil 1661bb9c12c9SSage Weil /* 1662bb9c12c9SSage Weil * commit transactions asynchronously. once btrfs_commit_transaction_async 1663bb9c12c9SSage Weil * returns, any subsequent transaction will not be allowed to join. 1664bb9c12c9SSage Weil */ 1665bb9c12c9SSage Weil struct btrfs_async_commit { 1666bb9c12c9SSage Weil struct btrfs_trans_handle *newtrans; 1667bb9c12c9SSage Weil struct btrfs_root *root; 16687892b5afSMiao Xie struct work_struct work; 1669bb9c12c9SSage Weil }; 1670bb9c12c9SSage Weil 1671bb9c12c9SSage Weil static void do_async_commit(struct work_struct *work) 1672bb9c12c9SSage Weil { 1673bb9c12c9SSage Weil struct btrfs_async_commit *ac = 16747892b5afSMiao Xie container_of(work, struct btrfs_async_commit, work); 1675bb9c12c9SSage Weil 16766fc4e354SSage Weil /* 16776fc4e354SSage Weil * We've got freeze protection passed with the transaction. 16786fc4e354SSage Weil * Tell lockdep about it. 16796fc4e354SSage Weil */ 1680b1a06a4bSLiu Bo if (ac->newtrans->type & __TRANS_FREEZABLE) 1681bee9182dSOleg Nesterov __sb_writers_acquired(ac->root->fs_info->sb, SB_FREEZE_FS); 16826fc4e354SSage Weil 1683e209db7aSSage Weil current->journal_info = ac->newtrans; 1684e209db7aSSage Weil 1685bb9c12c9SSage Weil btrfs_commit_transaction(ac->newtrans, ac->root); 1686bb9c12c9SSage Weil kfree(ac); 1687bb9c12c9SSage Weil } 1688bb9c12c9SSage Weil 1689bb9c12c9SSage Weil int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 1690bb9c12c9SSage Weil struct btrfs_root *root, 1691bb9c12c9SSage Weil int wait_for_unblock) 1692bb9c12c9SSage Weil { 1693bb9c12c9SSage Weil struct btrfs_async_commit *ac; 1694bb9c12c9SSage Weil struct btrfs_transaction *cur_trans; 1695bb9c12c9SSage Weil 1696bb9c12c9SSage Weil ac = kmalloc(sizeof(*ac), GFP_NOFS); 1697db5b493aSTsutomu Itoh if (!ac) 1698db5b493aSTsutomu Itoh return -ENOMEM; 1699bb9c12c9SSage Weil 17007892b5afSMiao Xie INIT_WORK(&ac->work, do_async_commit); 1701bb9c12c9SSage Weil ac->root = root; 17027a7eaa40SJosef Bacik ac->newtrans = btrfs_join_transaction(root); 17033612b495STsutomu Itoh if (IS_ERR(ac->newtrans)) { 17043612b495STsutomu Itoh int err = PTR_ERR(ac->newtrans); 17053612b495STsutomu Itoh kfree(ac); 17063612b495STsutomu Itoh return err; 17073612b495STsutomu Itoh } 1708bb9c12c9SSage Weil 1709bb9c12c9SSage Weil /* take transaction reference */ 1710bb9c12c9SSage Weil cur_trans = trans->transaction; 171113c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 1712bb9c12c9SSage Weil 1713bb9c12c9SSage Weil btrfs_end_transaction(trans, root); 17146fc4e354SSage Weil 17156fc4e354SSage Weil /* 17166fc4e354SSage Weil * Tell lockdep we've released the freeze rwsem, since the 17176fc4e354SSage Weil * async commit thread will be the one to unlock it. 17186fc4e354SSage Weil */ 1719b1a06a4bSLiu Bo if (ac->newtrans->type & __TRANS_FREEZABLE) 1720bee9182dSOleg Nesterov __sb_writers_release(root->fs_info->sb, SB_FREEZE_FS); 17216fc4e354SSage Weil 17227892b5afSMiao Xie schedule_work(&ac->work); 1723bb9c12c9SSage Weil 1724bb9c12c9SSage Weil /* wait for transaction to start and unblock */ 1725bb9c12c9SSage Weil if (wait_for_unblock) 1726bb9c12c9SSage Weil wait_current_trans_commit_start_and_unblock(root, cur_trans); 1727bb9c12c9SSage Weil else 1728bb9c12c9SSage Weil wait_current_trans_commit_start(root, cur_trans); 1729bb9c12c9SSage Weil 173038e88054SSage Weil if (current->journal_info == trans) 173138e88054SSage Weil current->journal_info = NULL; 173238e88054SSage Weil 1733724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 1734bb9c12c9SSage Weil return 0; 1735bb9c12c9SSage Weil } 1736bb9c12c9SSage Weil 173749b25e05SJeff Mahoney 173849b25e05SJeff Mahoney static void cleanup_transaction(struct btrfs_trans_handle *trans, 17397b8b92afSJosef Bacik struct btrfs_root *root, int err) 174049b25e05SJeff Mahoney { 174149b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 1742f094ac32SLiu Bo DEFINE_WAIT(wait); 174349b25e05SJeff Mahoney 174449b25e05SJeff Mahoney WARN_ON(trans->use_count > 1); 174549b25e05SJeff Mahoney 17467b8b92afSJosef Bacik btrfs_abort_transaction(trans, root, err); 17477b8b92afSJosef Bacik 174849b25e05SJeff Mahoney spin_lock(&root->fs_info->trans_lock); 174966b6135bSLiu Bo 175025d8c284SMiao Xie /* 175125d8c284SMiao Xie * If the transaction is removed from the list, it means this 175225d8c284SMiao Xie * transaction has been committed successfully, so it is impossible 175325d8c284SMiao Xie * to call the cleanup function. 175425d8c284SMiao Xie */ 175525d8c284SMiao Xie BUG_ON(list_empty(&cur_trans->list)); 175666b6135bSLiu Bo 175749b25e05SJeff Mahoney list_del_init(&cur_trans->list); 1758d7096fc3SJosef Bacik if (cur_trans == root->fs_info->running_transaction) { 17594a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_COMMIT_DOING; 1760f094ac32SLiu Bo spin_unlock(&root->fs_info->trans_lock); 1761f094ac32SLiu Bo wait_event(cur_trans->writer_wait, 1762f094ac32SLiu Bo atomic_read(&cur_trans->num_writers) == 1); 1763f094ac32SLiu Bo 1764f094ac32SLiu Bo spin_lock(&root->fs_info->trans_lock); 1765d7096fc3SJosef Bacik } 176649b25e05SJeff Mahoney spin_unlock(&root->fs_info->trans_lock); 176749b25e05SJeff Mahoney 176849b25e05SJeff Mahoney btrfs_cleanup_one_transaction(trans->transaction, root); 176949b25e05SJeff Mahoney 17704a9d8bdeSMiao Xie spin_lock(&root->fs_info->trans_lock); 17714a9d8bdeSMiao Xie if (cur_trans == root->fs_info->running_transaction) 17724a9d8bdeSMiao Xie root->fs_info->running_transaction = NULL; 17734a9d8bdeSMiao Xie spin_unlock(&root->fs_info->trans_lock); 17744a9d8bdeSMiao Xie 1775e0228285SJosef Bacik if (trans->type & __TRANS_FREEZABLE) 1776e0228285SJosef Bacik sb_end_intwrite(root->fs_info->sb); 1777724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 1778724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 177949b25e05SJeff Mahoney 178049b25e05SJeff Mahoney trace_btrfs_transaction_commit(root); 178149b25e05SJeff Mahoney 178249b25e05SJeff Mahoney if (current->journal_info == trans) 178349b25e05SJeff Mahoney current->journal_info = NULL; 1784c0af8f0bSWang Shilong btrfs_scrub_cancel(root->fs_info); 178549b25e05SJeff Mahoney 178649b25e05SJeff Mahoney kmem_cache_free(btrfs_trans_handle_cachep, trans); 178749b25e05SJeff Mahoney } 178849b25e05SJeff Mahoney 178982436617SMiao Xie static inline int btrfs_start_delalloc_flush(struct btrfs_fs_info *fs_info) 179082436617SMiao Xie { 179182436617SMiao Xie if (btrfs_test_opt(fs_info->tree_root, FLUSHONCOMMIT)) 17926c255e67SMiao Xie return btrfs_start_delalloc_roots(fs_info, 1, -1); 179382436617SMiao Xie return 0; 179482436617SMiao Xie } 179582436617SMiao Xie 179682436617SMiao Xie static inline void btrfs_wait_delalloc_flush(struct btrfs_fs_info *fs_info) 179782436617SMiao Xie { 179882436617SMiao Xie if (btrfs_test_opt(fs_info->tree_root, FLUSHONCOMMIT)) 1799b0244199SMiao Xie btrfs_wait_ordered_roots(fs_info, -1); 180082436617SMiao Xie } 180182436617SMiao Xie 180250d9aa99SJosef Bacik static inline void 180350d9aa99SJosef Bacik btrfs_wait_pending_ordered(struct btrfs_transaction *cur_trans, 180450d9aa99SJosef Bacik struct btrfs_fs_info *fs_info) 180550d9aa99SJosef Bacik { 180650d9aa99SJosef Bacik struct btrfs_ordered_extent *ordered; 180750d9aa99SJosef Bacik 180850d9aa99SJosef Bacik spin_lock(&fs_info->trans_lock); 180950d9aa99SJosef Bacik while (!list_empty(&cur_trans->pending_ordered)) { 181050d9aa99SJosef Bacik ordered = list_first_entry(&cur_trans->pending_ordered, 181150d9aa99SJosef Bacik struct btrfs_ordered_extent, 181250d9aa99SJosef Bacik trans_list); 181350d9aa99SJosef Bacik list_del_init(&ordered->trans_list); 181450d9aa99SJosef Bacik spin_unlock(&fs_info->trans_lock); 181550d9aa99SJosef Bacik 181650d9aa99SJosef Bacik wait_event(ordered->wait, test_bit(BTRFS_ORDERED_COMPLETE, 181750d9aa99SJosef Bacik &ordered->flags)); 181850d9aa99SJosef Bacik btrfs_put_ordered_extent(ordered); 181950d9aa99SJosef Bacik spin_lock(&fs_info->trans_lock); 182050d9aa99SJosef Bacik } 182150d9aa99SJosef Bacik spin_unlock(&fs_info->trans_lock); 182250d9aa99SJosef Bacik } 182350d9aa99SJosef Bacik 182479154b1bSChris Mason int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 182579154b1bSChris Mason struct btrfs_root *root) 182679154b1bSChris Mason { 182749b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 18288fd17795SChris Mason struct btrfs_transaction *prev_trans = NULL; 1829656f30dbSFilipe Manana struct btrfs_inode *btree_ino = BTRFS_I(root->fs_info->btree_inode); 183025287e0aSMiao Xie int ret; 183179154b1bSChris Mason 18328d25a086SMiao Xie /* Stop the commit early if ->aborted is set */ 18338d25a086SMiao Xie if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { 183425287e0aSMiao Xie ret = cur_trans->aborted; 1835e4a2bcacSJosef Bacik btrfs_end_transaction(trans, root); 1836e4a2bcacSJosef Bacik return ret; 183725287e0aSMiao Xie } 183849b25e05SJeff Mahoney 183956bec294SChris Mason /* make a pass through all the delayed refs we have so far 184056bec294SChris Mason * any runnings procs may add more while we are here 184156bec294SChris Mason */ 184256bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 1843e4a2bcacSJosef Bacik if (ret) { 1844e4a2bcacSJosef Bacik btrfs_end_transaction(trans, root); 1845e4a2bcacSJosef Bacik return ret; 1846e4a2bcacSJosef Bacik } 184756bec294SChris Mason 18480e721106SJosef Bacik btrfs_trans_release_metadata(trans, root); 18490e721106SJosef Bacik trans->block_rsv = NULL; 1850272d26d0SMiao Xie if (trans->qgroup_reserved) { 1851272d26d0SMiao Xie btrfs_qgroup_free(root, trans->qgroup_reserved); 1852272d26d0SMiao Xie trans->qgroup_reserved = 0; 1853272d26d0SMiao Xie } 18540e721106SJosef Bacik 1855b7ec40d7SChris Mason cur_trans = trans->transaction; 185649b25e05SJeff Mahoney 185756bec294SChris Mason /* 185856bec294SChris Mason * set the flushing flag so procs in this transaction have to 185956bec294SChris Mason * start sending their work down. 186056bec294SChris Mason */ 1861b7ec40d7SChris Mason cur_trans->delayed_refs.flushing = 1; 18621be41b78SJosef Bacik smp_wmb(); 186356bec294SChris Mason 1864ea658badSJosef Bacik if (!list_empty(&trans->new_bgs)) 1865ea658badSJosef Bacik btrfs_create_pending_block_groups(trans, root); 1866ea658badSJosef Bacik 1867c3e69d58SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 1868e4a2bcacSJosef Bacik if (ret) { 1869e4a2bcacSJosef Bacik btrfs_end_transaction(trans, root); 1870e4a2bcacSJosef Bacik return ret; 1871e4a2bcacSJosef Bacik } 187256bec294SChris Mason 18731bbc621eSChris Mason if (!cur_trans->dirty_bg_run) { 18741bbc621eSChris Mason int run_it = 0; 18751bbc621eSChris Mason 18761bbc621eSChris Mason /* this mutex is also taken before trying to set 18771bbc621eSChris Mason * block groups readonly. We need to make sure 18781bbc621eSChris Mason * that nobody has set a block group readonly 18791bbc621eSChris Mason * after a extents from that block group have been 18801bbc621eSChris Mason * allocated for cache files. btrfs_set_block_group_ro 18811bbc621eSChris Mason * will wait for the transaction to commit if it 18821bbc621eSChris Mason * finds dirty_bg_run = 1 18831bbc621eSChris Mason * 18841bbc621eSChris Mason * The dirty_bg_run flag is also used to make sure only 18851bbc621eSChris Mason * one process starts all the block group IO. It wouldn't 18861bbc621eSChris Mason * hurt to have more than one go through, but there's no 18871bbc621eSChris Mason * real advantage to it either. 18881bbc621eSChris Mason */ 18891bbc621eSChris Mason mutex_lock(&root->fs_info->ro_block_group_mutex); 18901bbc621eSChris Mason if (!cur_trans->dirty_bg_run) { 18911bbc621eSChris Mason run_it = 1; 18921bbc621eSChris Mason cur_trans->dirty_bg_run = 1; 18931bbc621eSChris Mason } 18941bbc621eSChris Mason mutex_unlock(&root->fs_info->ro_block_group_mutex); 18951bbc621eSChris Mason 18961bbc621eSChris Mason if (run_it) 18971bbc621eSChris Mason ret = btrfs_start_dirty_block_groups(trans, root); 18981bbc621eSChris Mason } 18991bbc621eSChris Mason if (ret) { 19001bbc621eSChris Mason btrfs_end_transaction(trans, root); 19011bbc621eSChris Mason return ret; 19021bbc621eSChris Mason } 19031bbc621eSChris Mason 19044a9d8bdeSMiao Xie spin_lock(&root->fs_info->trans_lock); 1905d3efe084SFilipe Manana list_splice_init(&trans->ordered, &cur_trans->pending_ordered); 19064a9d8bdeSMiao Xie if (cur_trans->state >= TRANS_STATE_COMMIT_START) { 19074a9d8bdeSMiao Xie spin_unlock(&root->fs_info->trans_lock); 190813c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 190949b25e05SJeff Mahoney ret = btrfs_end_transaction(trans, root); 1910ccd467d6SChris Mason 1911b9c8300cSLi Zefan wait_for_commit(root, cur_trans); 191215ee9bc7SJosef Bacik 1913b4924a0fSLiu Bo if (unlikely(cur_trans->aborted)) 1914b4924a0fSLiu Bo ret = cur_trans->aborted; 1915b4924a0fSLiu Bo 1916724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 191715ee9bc7SJosef Bacik 191849b25e05SJeff Mahoney return ret; 191979154b1bSChris Mason } 19204313b399SChris Mason 19214a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_COMMIT_START; 1922bb9c12c9SSage Weil wake_up(&root->fs_info->transaction_blocked_wait); 1923bb9c12c9SSage Weil 1924ccd467d6SChris Mason if (cur_trans->list.prev != &root->fs_info->trans_list) { 1925ccd467d6SChris Mason prev_trans = list_entry(cur_trans->list.prev, 1926ccd467d6SChris Mason struct btrfs_transaction, list); 19274a9d8bdeSMiao Xie if (prev_trans->state != TRANS_STATE_COMPLETED) { 192813c5a93eSJosef Bacik atomic_inc(&prev_trans->use_count); 1929a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1930ccd467d6SChris Mason 1931ccd467d6SChris Mason wait_for_commit(root, prev_trans); 19321f9b8c8fSFilipe Manana ret = prev_trans->aborted; 1933ccd467d6SChris Mason 1934724e2315SJosef Bacik btrfs_put_transaction(prev_trans); 19351f9b8c8fSFilipe Manana if (ret) 19361f9b8c8fSFilipe Manana goto cleanup_transaction; 1937a4abeea4SJosef Bacik } else { 1938a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1939ccd467d6SChris Mason } 1940a4abeea4SJosef Bacik } else { 1941a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1942ccd467d6SChris Mason } 194315ee9bc7SJosef Bacik 19440860adfdSMiao Xie extwriter_counter_dec(cur_trans, trans->type); 19450860adfdSMiao Xie 194682436617SMiao Xie ret = btrfs_start_delalloc_flush(root->fs_info); 194782436617SMiao Xie if (ret) 194882436617SMiao Xie goto cleanup_transaction; 194982436617SMiao Xie 19508d875f95SChris Mason ret = btrfs_run_delayed_items(trans, root); 195149b25e05SJeff Mahoney if (ret) 195249b25e05SJeff Mahoney goto cleanup_transaction; 195316cdcec7SMiao Xie 1954581227d0SMiao Xie wait_event(cur_trans->writer_wait, 1955581227d0SMiao Xie extwriter_counter_read(cur_trans) == 0); 1956ed3b3d31SChris Mason 1957581227d0SMiao Xie /* some pending stuffs might be added after the previous flush. */ 19588d875f95SChris Mason ret = btrfs_run_delayed_items(trans, root); 1959ca469637SMiao Xie if (ret) 1960ca469637SMiao Xie goto cleanup_transaction; 1961ca469637SMiao Xie 196282436617SMiao Xie btrfs_wait_delalloc_flush(root->fs_info); 1963cb7ab021SWang Shilong 196450d9aa99SJosef Bacik btrfs_wait_pending_ordered(cur_trans, root->fs_info); 196550d9aa99SJosef Bacik 1966cb7ab021SWang Shilong btrfs_scrub_pause(root); 1967ed0ca140SJosef Bacik /* 1968ed0ca140SJosef Bacik * Ok now we need to make sure to block out any other joins while we 1969ed0ca140SJosef Bacik * commit the transaction. We could have started a join before setting 19704a9d8bdeSMiao Xie * COMMIT_DOING so make sure to wait for num_writers to == 1 again. 1971ed0ca140SJosef Bacik */ 1972a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 19734a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_COMMIT_DOING; 1974a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1975ed0ca140SJosef Bacik wait_event(cur_trans->writer_wait, 1976ed0ca140SJosef Bacik atomic_read(&cur_trans->num_writers) == 1); 197715ee9bc7SJosef Bacik 19782cba30f1SMiao Xie /* ->aborted might be set after the previous check, so check it */ 19792cba30f1SMiao Xie if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { 19802cba30f1SMiao Xie ret = cur_trans->aborted; 19816cf7f77eSWang Shilong goto scrub_continue; 19822cba30f1SMiao Xie } 19837585717fSChris Mason /* 19847585717fSChris Mason * the reloc mutex makes sure that we stop 19857585717fSChris Mason * the balancing code from coming in and moving 19867585717fSChris Mason * extents around in the middle of the commit 19877585717fSChris Mason */ 19887585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 19897585717fSChris Mason 199042874b3dSMiao Xie /* 199142874b3dSMiao Xie * We needn't worry about the delayed items because we will 199242874b3dSMiao Xie * deal with them in create_pending_snapshot(), which is the 199342874b3dSMiao Xie * core function of the snapshot creation. 199442874b3dSMiao Xie */ 199542874b3dSMiao Xie ret = create_pending_snapshots(trans, root->fs_info); 199649b25e05SJeff Mahoney if (ret) { 199749b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 19986cf7f77eSWang Shilong goto scrub_continue; 199949b25e05SJeff Mahoney } 20003063d29fSChris Mason 200142874b3dSMiao Xie /* 200242874b3dSMiao Xie * We insert the dir indexes of the snapshots and update the inode 200342874b3dSMiao Xie * of the snapshots' parents after the snapshot creation, so there 200442874b3dSMiao Xie * are some delayed items which are not dealt with. Now deal with 200542874b3dSMiao Xie * them. 200642874b3dSMiao Xie * 200742874b3dSMiao Xie * We needn't worry that this operation will corrupt the snapshots, 200842874b3dSMiao Xie * because all the tree which are snapshoted will be forced to COW 200942874b3dSMiao Xie * the nodes and leaves. 201042874b3dSMiao Xie */ 201142874b3dSMiao Xie ret = btrfs_run_delayed_items(trans, root); 201249b25e05SJeff Mahoney if (ret) { 201349b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 20146cf7f77eSWang Shilong goto scrub_continue; 201549b25e05SJeff Mahoney } 201616cdcec7SMiao Xie 201756bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 201849b25e05SJeff Mahoney if (ret) { 201949b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 20206cf7f77eSWang Shilong goto scrub_continue; 202149b25e05SJeff Mahoney } 202256bec294SChris Mason 20230ed4792aSQu Wenruo /* Reocrd old roots for later qgroup accounting */ 20240ed4792aSQu Wenruo ret = btrfs_qgroup_prepare_account_extents(trans, root->fs_info); 20250ed4792aSQu Wenruo if (ret) { 20260ed4792aSQu Wenruo mutex_unlock(&root->fs_info->reloc_mutex); 20270ed4792aSQu Wenruo goto scrub_continue; 20280ed4792aSQu Wenruo } 20290ed4792aSQu Wenruo 2030e999376fSChris Mason /* 2031e999376fSChris Mason * make sure none of the code above managed to slip in a 2032e999376fSChris Mason * delayed item 2033e999376fSChris Mason */ 2034e999376fSChris Mason btrfs_assert_delayed_root_empty(root); 2035e999376fSChris Mason 20362c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 2037dc17ff8fSChris Mason 2038e02119d5SChris Mason /* btrfs_commit_tree_roots is responsible for getting the 2039e02119d5SChris Mason * various roots consistent with each other. Every pointer 2040e02119d5SChris Mason * in the tree of tree roots has to point to the most up to date 2041e02119d5SChris Mason * root for every subvolume and other tree. So, we have to keep 2042e02119d5SChris Mason * the tree logging code from jumping in and changing any 2043e02119d5SChris Mason * of the trees. 2044e02119d5SChris Mason * 2045e02119d5SChris Mason * At this point in the commit, there can't be any tree-log 2046e02119d5SChris Mason * writers, but a little lower down we drop the trans mutex 2047e02119d5SChris Mason * and let new people in. By holding the tree_log_mutex 2048e02119d5SChris Mason * from now until after the super is written, we avoid races 2049e02119d5SChris Mason * with the tree-log code. 2050e02119d5SChris Mason */ 2051e02119d5SChris Mason mutex_lock(&root->fs_info->tree_log_mutex); 20521a40e23bSZheng Yan 20535d4f98a2SYan Zheng ret = commit_fs_roots(trans, root); 205449b25e05SJeff Mahoney if (ret) { 205549b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 2056871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 20576cf7f77eSWang Shilong goto scrub_continue; 205849b25e05SJeff Mahoney } 205954aa1f4dSChris Mason 20603818aea2SQu Wenruo /* 20617e1876acSDavid Sterba * Since the transaction is done, we can apply the pending changes 20627e1876acSDavid Sterba * before the next transaction. 20633818aea2SQu Wenruo */ 2064572d9ab7SDavid Sterba btrfs_apply_pending_changes(root->fs_info); 20653818aea2SQu Wenruo 20665d4f98a2SYan Zheng /* commit_fs_roots gets rid of all the tree log roots, it is now 2067e02119d5SChris Mason * safe to free the root of tree log roots 2068e02119d5SChris Mason */ 2069e02119d5SChris Mason btrfs_free_log_root_tree(trans, root->fs_info); 2070e02119d5SChris Mason 20710ed4792aSQu Wenruo /* 20720ed4792aSQu Wenruo * Since fs roots are all committed, we can get a quite accurate 20730ed4792aSQu Wenruo * new_roots. So let's do quota accounting. 20740ed4792aSQu Wenruo */ 20750ed4792aSQu Wenruo ret = btrfs_qgroup_account_extents(trans, root->fs_info); 20760ed4792aSQu Wenruo if (ret < 0) { 20770ed4792aSQu Wenruo mutex_unlock(&root->fs_info->tree_log_mutex); 20780ed4792aSQu Wenruo mutex_unlock(&root->fs_info->reloc_mutex); 20790ed4792aSQu Wenruo goto scrub_continue; 20800ed4792aSQu Wenruo } 20810ed4792aSQu Wenruo 20825d4f98a2SYan Zheng ret = commit_cowonly_roots(trans, root); 208349b25e05SJeff Mahoney if (ret) { 208449b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 2085871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 20866cf7f77eSWang Shilong goto scrub_continue; 208749b25e05SJeff Mahoney } 208854aa1f4dSChris Mason 20892cba30f1SMiao Xie /* 20902cba30f1SMiao Xie * The tasks which save the space cache and inode cache may also 20912cba30f1SMiao Xie * update ->aborted, check it. 20922cba30f1SMiao Xie */ 20932cba30f1SMiao Xie if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { 20942cba30f1SMiao Xie ret = cur_trans->aborted; 20952cba30f1SMiao Xie mutex_unlock(&root->fs_info->tree_log_mutex); 20962cba30f1SMiao Xie mutex_unlock(&root->fs_info->reloc_mutex); 20976cf7f77eSWang Shilong goto scrub_continue; 20982cba30f1SMiao Xie } 20992cba30f1SMiao Xie 210011833d66SYan Zheng btrfs_prepare_extent_commit(trans, root); 210111833d66SYan Zheng 210278fae27eSChris Mason cur_trans = root->fs_info->running_transaction; 21035f39d397SChris Mason 21045d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->tree_root->root_item, 21055d4f98a2SYan Zheng root->fs_info->tree_root->node); 21069e351cc8SJosef Bacik list_add_tail(&root->fs_info->tree_root->dirty_list, 21079e351cc8SJosef Bacik &cur_trans->switch_commits); 21085d4f98a2SYan Zheng 21095d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->chunk_root->root_item, 21105d4f98a2SYan Zheng root->fs_info->chunk_root->node); 21119e351cc8SJosef Bacik list_add_tail(&root->fs_info->chunk_root->dirty_list, 21129e351cc8SJosef Bacik &cur_trans->switch_commits); 21139e351cc8SJosef Bacik 21149e351cc8SJosef Bacik switch_commit_roots(cur_trans, root->fs_info); 21155d4f98a2SYan Zheng 2116edf39272SJan Schmidt assert_qgroups_uptodate(trans); 2117ce93ec54SJosef Bacik ASSERT(list_empty(&cur_trans->dirty_bgs)); 21181bbc621eSChris Mason ASSERT(list_empty(&cur_trans->io_bgs)); 21195d4f98a2SYan Zheng update_super_roots(root); 2120e02119d5SChris Mason 21216c41761fSDavid Sterba btrfs_set_super_log_root(root->fs_info->super_copy, 0); 21226c41761fSDavid Sterba btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); 21236c41761fSDavid Sterba memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, 21246c41761fSDavid Sterba sizeof(*root->fs_info->super_copy)); 2125ccd467d6SChris Mason 2126935e5cc9SMiao Xie btrfs_update_commit_device_size(root->fs_info); 2127ce7213c7SMiao Xie btrfs_update_commit_device_bytes_used(root, cur_trans); 2128935e5cc9SMiao Xie 2129656f30dbSFilipe Manana clear_bit(BTRFS_INODE_BTREE_LOG1_ERR, &btree_ino->runtime_flags); 2130656f30dbSFilipe Manana clear_bit(BTRFS_INODE_BTREE_LOG2_ERR, &btree_ino->runtime_flags); 2131656f30dbSFilipe Manana 21324fbcdf66SFilipe Manana btrfs_trans_release_chunk_metadata(trans); 21334fbcdf66SFilipe Manana 2134a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 21354a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_UNBLOCKED; 2136a4abeea4SJosef Bacik root->fs_info->running_transaction = NULL; 2137a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 21387585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 2139b7ec40d7SChris Mason 2140f9295749SChris Mason wake_up(&root->fs_info->transaction_wait); 2141e6dcd2dcSChris Mason 214279154b1bSChris Mason ret = btrfs_write_and_wait_transaction(trans, root); 214349b25e05SJeff Mahoney if (ret) { 214449b25e05SJeff Mahoney btrfs_error(root->fs_info, ret, 214508748810SDavid Sterba "Error while writing out transaction"); 214649b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 21476cf7f77eSWang Shilong goto scrub_continue; 214849b25e05SJeff Mahoney } 214949b25e05SJeff Mahoney 215049b25e05SJeff Mahoney ret = write_ctree_super(trans, root, 0); 215149b25e05SJeff Mahoney if (ret) { 215249b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 21536cf7f77eSWang Shilong goto scrub_continue; 215449b25e05SJeff Mahoney } 21554313b399SChris Mason 2156e02119d5SChris Mason /* 2157e02119d5SChris Mason * the super is written, we can safely allow the tree-loggers 2158e02119d5SChris Mason * to go about their business 2159e02119d5SChris Mason */ 2160e02119d5SChris Mason mutex_unlock(&root->fs_info->tree_log_mutex); 2161e02119d5SChris Mason 216211833d66SYan Zheng btrfs_finish_extent_commit(trans, root); 21634313b399SChris Mason 216413212b54SZhao Lei if (cur_trans->have_free_bgs) 216513212b54SZhao Lei btrfs_clear_space_info_full(root->fs_info); 216613212b54SZhao Lei 216715ee9bc7SJosef Bacik root->fs_info->last_trans_committed = cur_trans->transid; 21684a9d8bdeSMiao Xie /* 21694a9d8bdeSMiao Xie * We needn't acquire the lock here because there is no other task 21704a9d8bdeSMiao Xie * which can change it. 21714a9d8bdeSMiao Xie */ 21724a9d8bdeSMiao Xie cur_trans->state = TRANS_STATE_COMPLETED; 21732c90e5d6SChris Mason wake_up(&cur_trans->commit_wait); 21743de4586cSChris Mason 2175a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 217613c5a93eSJosef Bacik list_del_init(&cur_trans->list); 2177a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 2178a4abeea4SJosef Bacik 2179724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 2180724e2315SJosef Bacik btrfs_put_transaction(cur_trans); 218158176a96SJosef Bacik 21820860adfdSMiao Xie if (trans->type & __TRANS_FREEZABLE) 2183b2b5ef5cSJan Kara sb_end_intwrite(root->fs_info->sb); 2184b2b5ef5cSJan Kara 21851abe9b8aSliubo trace_btrfs_transaction_commit(root); 21861abe9b8aSliubo 2187a2de733cSArne Jansen btrfs_scrub_continue(root); 2188a2de733cSArne Jansen 21899ed74f2dSJosef Bacik if (current->journal_info == trans) 21909ed74f2dSJosef Bacik current->journal_info = NULL; 21919ed74f2dSJosef Bacik 21922c90e5d6SChris Mason kmem_cache_free(btrfs_trans_handle_cachep, trans); 219324bbcf04SYan, Zheng 21948a733013SZhao Lei if (current != root->fs_info->transaction_kthread && 21958a733013SZhao Lei current != root->fs_info->cleaner_kthread) 219624bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 219724bbcf04SYan, Zheng 219879154b1bSChris Mason return ret; 219949b25e05SJeff Mahoney 22006cf7f77eSWang Shilong scrub_continue: 22016cf7f77eSWang Shilong btrfs_scrub_continue(root); 220249b25e05SJeff Mahoney cleanup_transaction: 22030e721106SJosef Bacik btrfs_trans_release_metadata(trans, root); 22044fbcdf66SFilipe Manana btrfs_trans_release_chunk_metadata(trans); 22050e721106SJosef Bacik trans->block_rsv = NULL; 2206272d26d0SMiao Xie if (trans->qgroup_reserved) { 2207272d26d0SMiao Xie btrfs_qgroup_free(root, trans->qgroup_reserved); 2208272d26d0SMiao Xie trans->qgroup_reserved = 0; 2209272d26d0SMiao Xie } 2210c2cf52ebSSimon Kirby btrfs_warn(root->fs_info, "Skipping commit of aborted transaction."); 221149b25e05SJeff Mahoney if (current->journal_info == trans) 221249b25e05SJeff Mahoney current->journal_info = NULL; 22137b8b92afSJosef Bacik cleanup_transaction(trans, root, ret); 221449b25e05SJeff Mahoney 221549b25e05SJeff Mahoney return ret; 221679154b1bSChris Mason } 221779154b1bSChris Mason 2218d352ac68SChris Mason /* 22199d1a2a3aSDavid Sterba * return < 0 if error 22209d1a2a3aSDavid Sterba * 0 if there are no more dead_roots at the time of call 22219d1a2a3aSDavid Sterba * 1 there are more to be processed, call me again 22229d1a2a3aSDavid Sterba * 22239d1a2a3aSDavid Sterba * The return value indicates there are certainly more snapshots to delete, but 22249d1a2a3aSDavid Sterba * if there comes a new one during processing, it may return 0. We don't mind, 22259d1a2a3aSDavid Sterba * because btrfs_commit_super will poke cleaner thread and it will process it a 22269d1a2a3aSDavid Sterba * few seconds later. 2227d352ac68SChris Mason */ 22289d1a2a3aSDavid Sterba int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root) 2229e9d0b13bSChris Mason { 22309d1a2a3aSDavid Sterba int ret; 22315d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 2232e9d0b13bSChris Mason 2233a4abeea4SJosef Bacik spin_lock(&fs_info->trans_lock); 22349d1a2a3aSDavid Sterba if (list_empty(&fs_info->dead_roots)) { 22359d1a2a3aSDavid Sterba spin_unlock(&fs_info->trans_lock); 22369d1a2a3aSDavid Sterba return 0; 22379d1a2a3aSDavid Sterba } 22389d1a2a3aSDavid Sterba root = list_first_entry(&fs_info->dead_roots, 22399d1a2a3aSDavid Sterba struct btrfs_root, root_list); 2240cfad392bSJosef Bacik list_del_init(&root->root_list); 2241a4abeea4SJosef Bacik spin_unlock(&fs_info->trans_lock); 22425d4f98a2SYan Zheng 2243efe120a0SFrank Holton pr_debug("BTRFS: cleaner removing %llu\n", root->objectid); 224476dda93cSYan, Zheng 224516cdcec7SMiao Xie btrfs_kill_all_delayed_nodes(root); 224616cdcec7SMiao Xie 224776dda93cSYan, Zheng if (btrfs_header_backref_rev(root->node) < 224876dda93cSYan, Zheng BTRFS_MIXED_BACKREF_REV) 22492c536799SJeff Mahoney ret = btrfs_drop_snapshot(root, NULL, 0, 0); 225076dda93cSYan, Zheng else 22512c536799SJeff Mahoney ret = btrfs_drop_snapshot(root, NULL, 1, 0); 225232471dc2SDavid Sterba 22536596a928SJosef Bacik return (ret < 0) ? 0 : 1; 2254e9d0b13bSChris Mason } 2255572d9ab7SDavid Sterba 2256572d9ab7SDavid Sterba void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info) 2257572d9ab7SDavid Sterba { 2258572d9ab7SDavid Sterba unsigned long prev; 2259572d9ab7SDavid Sterba unsigned long bit; 2260572d9ab7SDavid Sterba 22616c9fe14fSQu Wenruo prev = xchg(&fs_info->pending_changes, 0); 2262572d9ab7SDavid Sterba if (!prev) 2263572d9ab7SDavid Sterba return; 2264572d9ab7SDavid Sterba 22657e1876acSDavid Sterba bit = 1 << BTRFS_PENDING_SET_INODE_MAP_CACHE; 22667e1876acSDavid Sterba if (prev & bit) 22677e1876acSDavid Sterba btrfs_set_opt(fs_info->mount_opt, INODE_MAP_CACHE); 22687e1876acSDavid Sterba prev &= ~bit; 22697e1876acSDavid Sterba 22707e1876acSDavid Sterba bit = 1 << BTRFS_PENDING_CLEAR_INODE_MAP_CACHE; 22717e1876acSDavid Sterba if (prev & bit) 22727e1876acSDavid Sterba btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE); 22737e1876acSDavid Sterba prev &= ~bit; 22747e1876acSDavid Sterba 2275d51033d0SDavid Sterba bit = 1 << BTRFS_PENDING_COMMIT; 2276d51033d0SDavid Sterba if (prev & bit) 2277d51033d0SDavid Sterba btrfs_debug(fs_info, "pending commit done"); 2278d51033d0SDavid Sterba prev &= ~bit; 2279d51033d0SDavid Sterba 2280572d9ab7SDavid Sterba if (prev) 2281572d9ab7SDavid Sterba btrfs_warn(fs_info, 2282572d9ab7SDavid Sterba "unknown pending changes left 0x%lx, ignoring", prev); 2283572d9ab7SDavid Sterba } 2284