16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 1979154b1bSChris Mason #include <linux/fs.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 2134088780SChris Mason #include <linux/sched.h> 22d3c2fdcfSChris Mason #include <linux/writeback.h> 235f39d397SChris Mason #include <linux/pagemap.h> 245f2cc086SChris Mason #include <linux/blkdev.h> 2579154b1bSChris Mason #include "ctree.h" 2679154b1bSChris Mason #include "disk-io.h" 2779154b1bSChris Mason #include "transaction.h" 28925baeddSChris Mason #include "locking.h" 29e02119d5SChris Mason #include "tree-log.h" 30581bb050SLi Zefan #include "inode-map.h" 31733f4fbbSStefan Behrens #include "volumes.h" 3279154b1bSChris Mason 330f7d52f4SChris Mason #define BTRFS_ROOT_TRANS_TAG 0 340f7d52f4SChris Mason 3549b25e05SJeff Mahoney void put_transaction(struct btrfs_transaction *transaction) 3679154b1bSChris Mason { 3713c5a93eSJosef Bacik WARN_ON(atomic_read(&transaction->use_count) == 0); 3813c5a93eSJosef Bacik if (atomic_dec_and_test(&transaction->use_count)) { 39a4abeea4SJosef Bacik BUG_ON(!list_empty(&transaction->list)); 4000f04b88SArne Jansen WARN_ON(transaction->delayed_refs.root.rb_node); 412c90e5d6SChris Mason memset(transaction, 0, sizeof(*transaction)); 422c90e5d6SChris Mason kmem_cache_free(btrfs_transaction_cachep, transaction); 4379154b1bSChris Mason } 4478fae27eSChris Mason } 4579154b1bSChris Mason 46817d52f8SJosef Bacik static noinline void switch_commit_root(struct btrfs_root *root) 47817d52f8SJosef Bacik { 48817d52f8SJosef Bacik free_extent_buffer(root->commit_root); 49817d52f8SJosef Bacik root->commit_root = btrfs_root_node(root); 50817d52f8SJosef Bacik } 51817d52f8SJosef Bacik 52d352ac68SChris Mason /* 53d352ac68SChris Mason * either allocate a new transaction or hop into the existing one 54d352ac68SChris Mason */ 55a4abeea4SJosef Bacik static noinline int join_transaction(struct btrfs_root *root, int nofail) 5679154b1bSChris Mason { 5779154b1bSChris Mason struct btrfs_transaction *cur_trans; 5819ae4e81SJan Schmidt struct btrfs_fs_info *fs_info = root->fs_info; 59a4abeea4SJosef Bacik 6019ae4e81SJan Schmidt spin_lock(&fs_info->trans_lock); 61d43317dcSChris Mason loop: 6249b25e05SJeff Mahoney /* The file system has been taken offline. No new transactions. */ 6319ae4e81SJan Schmidt if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 6419ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 6549b25e05SJeff Mahoney return -EROFS; 6649b25e05SJeff Mahoney } 6749b25e05SJeff Mahoney 6819ae4e81SJan Schmidt if (fs_info->trans_no_join) { 69a4abeea4SJosef Bacik if (!nofail) { 7019ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 71a4abeea4SJosef Bacik return -EBUSY; 72a4abeea4SJosef Bacik } 73a4abeea4SJosef Bacik } 74a4abeea4SJosef Bacik 7519ae4e81SJan Schmidt cur_trans = fs_info->running_transaction; 76a4abeea4SJosef Bacik if (cur_trans) { 77871383beSDavid Sterba if (cur_trans->aborted) { 7819ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 7949b25e05SJeff Mahoney return cur_trans->aborted; 80871383beSDavid Sterba } 81a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 82a4abeea4SJosef Bacik atomic_inc(&cur_trans->num_writers); 83a4abeea4SJosef Bacik cur_trans->num_joined++; 8419ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 85a4abeea4SJosef Bacik return 0; 86a4abeea4SJosef Bacik } 8719ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 88a4abeea4SJosef Bacik 89a4abeea4SJosef Bacik cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); 90db5b493aSTsutomu Itoh if (!cur_trans) 91db5b493aSTsutomu Itoh return -ENOMEM; 92d43317dcSChris Mason 9319ae4e81SJan Schmidt spin_lock(&fs_info->trans_lock); 9419ae4e81SJan Schmidt if (fs_info->running_transaction) { 95d43317dcSChris Mason /* 96d43317dcSChris Mason * someone started a transaction after we unlocked. Make sure 97d43317dcSChris Mason * to redo the trans_no_join checks above 98d43317dcSChris Mason */ 99a4abeea4SJosef Bacik kmem_cache_free(btrfs_transaction_cachep, cur_trans); 10019ae4e81SJan Schmidt cur_trans = fs_info->running_transaction; 101d43317dcSChris Mason goto loop; 1027b8b92afSJosef Bacik } else if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 1037b8b92afSJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1047b8b92afSJosef Bacik kmem_cache_free(btrfs_transaction_cachep, cur_trans); 1057b8b92afSJosef Bacik return -EROFS; 106a4abeea4SJosef Bacik } 107d43317dcSChris Mason 10813c5a93eSJosef Bacik atomic_set(&cur_trans->num_writers, 1); 10915ee9bc7SJosef Bacik cur_trans->num_joined = 0; 11079154b1bSChris Mason init_waitqueue_head(&cur_trans->writer_wait); 11179154b1bSChris Mason init_waitqueue_head(&cur_trans->commit_wait); 11279154b1bSChris Mason cur_trans->in_commit = 0; 113f9295749SChris Mason cur_trans->blocked = 0; 114a4abeea4SJosef Bacik /* 115a4abeea4SJosef Bacik * One for this trans handle, one so it will live on until we 116a4abeea4SJosef Bacik * commit the transaction. 117a4abeea4SJosef Bacik */ 118a4abeea4SJosef Bacik atomic_set(&cur_trans->use_count, 2); 11979154b1bSChris Mason cur_trans->commit_done = 0; 12008607c1bSChris Mason cur_trans->start_time = get_seconds(); 12156bec294SChris Mason 1226bef4d31SEric Paris cur_trans->delayed_refs.root = RB_ROOT; 12356bec294SChris Mason cur_trans->delayed_refs.num_entries = 0; 124c3e69d58SChris Mason cur_trans->delayed_refs.num_heads_ready = 0; 125c3e69d58SChris Mason cur_trans->delayed_refs.num_heads = 0; 12656bec294SChris Mason cur_trans->delayed_refs.flushing = 0; 127c3e69d58SChris Mason cur_trans->delayed_refs.run_delayed_start = 0; 12820b297d6SJan Schmidt 12920b297d6SJan Schmidt /* 13020b297d6SJan Schmidt * although the tree mod log is per file system and not per transaction, 13120b297d6SJan Schmidt * the log must never go across transaction boundaries. 13220b297d6SJan Schmidt */ 13320b297d6SJan Schmidt smp_mb(); 13420b297d6SJan Schmidt if (!list_empty(&fs_info->tree_mod_seq_list)) { 13520b297d6SJan Schmidt printk(KERN_ERR "btrfs: tree_mod_seq_list not empty when " 13620b297d6SJan Schmidt "creating a fresh transaction\n"); 13720b297d6SJan Schmidt WARN_ON(1); 13820b297d6SJan Schmidt } 13920b297d6SJan Schmidt if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) { 14020b297d6SJan Schmidt printk(KERN_ERR "btrfs: tree_mod_log rb tree not empty when " 14120b297d6SJan Schmidt "creating a fresh transaction\n"); 14220b297d6SJan Schmidt WARN_ON(1); 14320b297d6SJan Schmidt } 14420b297d6SJan Schmidt atomic_set(&fs_info->tree_mod_seq, 0); 14520b297d6SJan Schmidt 146a4abeea4SJosef Bacik spin_lock_init(&cur_trans->commit_lock); 14756bec294SChris Mason spin_lock_init(&cur_trans->delayed_refs.lock); 14856bec294SChris Mason 1493063d29fSChris Mason INIT_LIST_HEAD(&cur_trans->pending_snapshots); 15019ae4e81SJan Schmidt list_add_tail(&cur_trans->list, &fs_info->trans_list); 151d1310b2eSChris Mason extent_io_tree_init(&cur_trans->dirty_pages, 15219ae4e81SJan Schmidt fs_info->btree_inode->i_mapping); 15319ae4e81SJan Schmidt fs_info->generation++; 15419ae4e81SJan Schmidt cur_trans->transid = fs_info->generation; 15519ae4e81SJan Schmidt fs_info->running_transaction = cur_trans; 15649b25e05SJeff Mahoney cur_trans->aborted = 0; 15719ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 15815ee9bc7SJosef Bacik 15979154b1bSChris Mason return 0; 16079154b1bSChris Mason } 16179154b1bSChris Mason 162d352ac68SChris Mason /* 163d397712bSChris Mason * this does all the record keeping required to make sure that a reference 164d397712bSChris Mason * counted root is properly recorded in a given transaction. This is required 165d397712bSChris Mason * to make sure the old root from before we joined the transaction is deleted 166d397712bSChris Mason * when the transaction commits 167d352ac68SChris Mason */ 1687585717fSChris Mason static int record_root_in_trans(struct btrfs_trans_handle *trans, 1695d4f98a2SYan Zheng struct btrfs_root *root) 1706702ed49SChris Mason { 1715d4f98a2SYan Zheng if (root->ref_cows && root->last_trans < trans->transid) { 1726702ed49SChris Mason WARN_ON(root == root->fs_info->extent_root); 1735d4f98a2SYan Zheng WARN_ON(root->commit_root != root->node); 1745d4f98a2SYan Zheng 1757585717fSChris Mason /* 1767585717fSChris Mason * see below for in_trans_setup usage rules 1777585717fSChris Mason * we have the reloc mutex held now, so there 1787585717fSChris Mason * is only one writer in this function 1797585717fSChris Mason */ 1807585717fSChris Mason root->in_trans_setup = 1; 1817585717fSChris Mason 1827585717fSChris Mason /* make sure readers find in_trans_setup before 1837585717fSChris Mason * they find our root->last_trans update 1847585717fSChris Mason */ 1857585717fSChris Mason smp_wmb(); 1867585717fSChris Mason 187a4abeea4SJosef Bacik spin_lock(&root->fs_info->fs_roots_radix_lock); 188a4abeea4SJosef Bacik if (root->last_trans == trans->transid) { 189a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 190a4abeea4SJosef Bacik return 0; 191a4abeea4SJosef Bacik } 1926702ed49SChris Mason radix_tree_tag_set(&root->fs_info->fs_roots_radix, 1936702ed49SChris Mason (unsigned long)root->root_key.objectid, 1946702ed49SChris Mason BTRFS_ROOT_TRANS_TAG); 195a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 1967585717fSChris Mason root->last_trans = trans->transid; 1977585717fSChris Mason 1987585717fSChris Mason /* this is pretty tricky. We don't want to 1997585717fSChris Mason * take the relocation lock in btrfs_record_root_in_trans 2007585717fSChris Mason * unless we're really doing the first setup for this root in 2017585717fSChris Mason * this transaction. 2027585717fSChris Mason * 2037585717fSChris Mason * Normally we'd use root->last_trans as a flag to decide 2047585717fSChris Mason * if we want to take the expensive mutex. 2057585717fSChris Mason * 2067585717fSChris Mason * But, we have to set root->last_trans before we 2077585717fSChris Mason * init the relocation root, otherwise, we trip over warnings 2087585717fSChris Mason * in ctree.c. The solution used here is to flag ourselves 2097585717fSChris Mason * with root->in_trans_setup. When this is 1, we're still 2107585717fSChris Mason * fixing up the reloc trees and everyone must wait. 2117585717fSChris Mason * 2127585717fSChris Mason * When this is zero, they can trust root->last_trans and fly 2137585717fSChris Mason * through btrfs_record_root_in_trans without having to take the 2147585717fSChris Mason * lock. smp_wmb() makes sure that all the writes above are 2157585717fSChris Mason * done before we pop in the zero below 2167585717fSChris Mason */ 2175d4f98a2SYan Zheng btrfs_init_reloc_root(trans, root); 2187585717fSChris Mason smp_wmb(); 2197585717fSChris Mason root->in_trans_setup = 0; 2206702ed49SChris Mason } 2215d4f98a2SYan Zheng return 0; 2226702ed49SChris Mason } 2235d4f98a2SYan Zheng 2247585717fSChris Mason 2257585717fSChris Mason int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 2267585717fSChris Mason struct btrfs_root *root) 2277585717fSChris Mason { 2287585717fSChris Mason if (!root->ref_cows) 2297585717fSChris Mason return 0; 2307585717fSChris Mason 2317585717fSChris Mason /* 2327585717fSChris Mason * see record_root_in_trans for comments about in_trans_setup usage 2337585717fSChris Mason * and barriers 2347585717fSChris Mason */ 2357585717fSChris Mason smp_rmb(); 2367585717fSChris Mason if (root->last_trans == trans->transid && 2377585717fSChris Mason !root->in_trans_setup) 2387585717fSChris Mason return 0; 2397585717fSChris Mason 2407585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 2417585717fSChris Mason record_root_in_trans(trans, root); 2427585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 2437585717fSChris Mason 2447585717fSChris Mason return 0; 2457585717fSChris Mason } 2467585717fSChris Mason 247d352ac68SChris Mason /* wait for commit against the current transaction to become unblocked 248d352ac68SChris Mason * when this is done, it is safe to start a new transaction, but the current 249d352ac68SChris Mason * transaction might not be fully on disk. 250d352ac68SChris Mason */ 25137d1aeeeSChris Mason static void wait_current_trans(struct btrfs_root *root) 25279154b1bSChris Mason { 253f9295749SChris Mason struct btrfs_transaction *cur_trans; 25479154b1bSChris Mason 255a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 256f9295749SChris Mason cur_trans = root->fs_info->running_transaction; 25737d1aeeeSChris Mason if (cur_trans && cur_trans->blocked) { 25813c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 259a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 26072d63ed6SLi Zefan 26172d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 26272d63ed6SLi Zefan !cur_trans->blocked); 263f9295749SChris Mason put_transaction(cur_trans); 264a4abeea4SJosef Bacik } else { 265a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 266f9295749SChris Mason } 26737d1aeeeSChris Mason } 26837d1aeeeSChris Mason 269249ac1e5SJosef Bacik enum btrfs_trans_type { 270249ac1e5SJosef Bacik TRANS_START, 271249ac1e5SJosef Bacik TRANS_JOIN, 272249ac1e5SJosef Bacik TRANS_USERSPACE, 2730af3d00bSJosef Bacik TRANS_JOIN_NOLOCK, 274249ac1e5SJosef Bacik }; 275249ac1e5SJosef Bacik 276a22285a6SYan, Zheng static int may_wait_transaction(struct btrfs_root *root, int type) 27737d1aeeeSChris Mason { 278a4abeea4SJosef Bacik if (root->fs_info->log_root_recovering) 279a4abeea4SJosef Bacik return 0; 280a4abeea4SJosef Bacik 281a4abeea4SJosef Bacik if (type == TRANS_USERSPACE) 282a22285a6SYan, Zheng return 1; 283a4abeea4SJosef Bacik 284a4abeea4SJosef Bacik if (type == TRANS_START && 285a4abeea4SJosef Bacik !atomic_read(&root->fs_info->open_ioctl_trans)) 286a4abeea4SJosef Bacik return 1; 287a4abeea4SJosef Bacik 288a22285a6SYan, Zheng return 0; 289a22285a6SYan, Zheng } 290a22285a6SYan, Zheng 291a22285a6SYan, Zheng static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, 292a22285a6SYan, Zheng u64 num_items, int type) 293a22285a6SYan, Zheng { 294a22285a6SYan, Zheng struct btrfs_trans_handle *h; 295a22285a6SYan, Zheng struct btrfs_transaction *cur_trans; 296b5009945SJosef Bacik u64 num_bytes = 0; 297a22285a6SYan, Zheng int ret; 298acce952bSliubo 299acce952bSliubo if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) 300acce952bSliubo return ERR_PTR(-EROFS); 3012a1eb461SJosef Bacik 3022a1eb461SJosef Bacik if (current->journal_info) { 3032a1eb461SJosef Bacik WARN_ON(type != TRANS_JOIN && type != TRANS_JOIN_NOLOCK); 3042a1eb461SJosef Bacik h = current->journal_info; 3052a1eb461SJosef Bacik h->use_count++; 3062a1eb461SJosef Bacik h->orig_rsv = h->block_rsv; 3072a1eb461SJosef Bacik h->block_rsv = NULL; 3082a1eb461SJosef Bacik goto got_it; 3092a1eb461SJosef Bacik } 310b5009945SJosef Bacik 311b5009945SJosef Bacik /* 312b5009945SJosef Bacik * Do the reservation before we join the transaction so we can do all 313b5009945SJosef Bacik * the appropriate flushing if need be. 314b5009945SJosef Bacik */ 315b5009945SJosef Bacik if (num_items > 0 && root != root->fs_info->chunk_root) { 316b5009945SJosef Bacik num_bytes = btrfs_calc_trans_metadata_size(root, num_items); 3174a92b1b8SJosef Bacik ret = btrfs_block_rsv_add(root, 318b5009945SJosef Bacik &root->fs_info->trans_block_rsv, 319b5009945SJosef Bacik num_bytes); 320b5009945SJosef Bacik if (ret) 321b5009945SJosef Bacik return ERR_PTR(ret); 322b5009945SJosef Bacik } 323a22285a6SYan, Zheng again: 324a22285a6SYan, Zheng h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); 325a22285a6SYan, Zheng if (!h) 326a22285a6SYan, Zheng return ERR_PTR(-ENOMEM); 327a22285a6SYan, Zheng 328a22285a6SYan, Zheng if (may_wait_transaction(root, type)) 32937d1aeeeSChris Mason wait_current_trans(root); 330a22285a6SYan, Zheng 331a4abeea4SJosef Bacik do { 332a4abeea4SJosef Bacik ret = join_transaction(root, type == TRANS_JOIN_NOLOCK); 333a4abeea4SJosef Bacik if (ret == -EBUSY) 334a4abeea4SJosef Bacik wait_current_trans(root); 335a4abeea4SJosef Bacik } while (ret == -EBUSY); 336a4abeea4SJosef Bacik 337db5b493aSTsutomu Itoh if (ret < 0) { 3386e8df2aeSYoshinori Sano kmem_cache_free(btrfs_trans_handle_cachep, h); 339db5b493aSTsutomu Itoh return ERR_PTR(ret); 340db5b493aSTsutomu Itoh } 3410f7d52f4SChris Mason 342a22285a6SYan, Zheng cur_trans = root->fs_info->running_transaction; 343a22285a6SYan, Zheng 344a22285a6SYan, Zheng h->transid = cur_trans->transid; 345a22285a6SYan, Zheng h->transaction = cur_trans; 34679154b1bSChris Mason h->blocks_used = 0; 347a22285a6SYan, Zheng h->bytes_reserved = 0; 348d13603efSArne Jansen h->root = root; 34956bec294SChris Mason h->delayed_ref_updates = 0; 3502a1eb461SJosef Bacik h->use_count = 1; 351f0486c68SYan, Zheng h->block_rsv = NULL; 3522a1eb461SJosef Bacik h->orig_rsv = NULL; 35349b25e05SJeff Mahoney h->aborted = 0; 354bed92eaeSArne Jansen h->delayed_ref_elem.seq = 0; 355bed92eaeSArne Jansen INIT_LIST_HEAD(&h->qgroup_ref_list); 356b7ec40d7SChris Mason 357a22285a6SYan, Zheng smp_mb(); 358a22285a6SYan, Zheng if (cur_trans->blocked && may_wait_transaction(root, type)) { 359a22285a6SYan, Zheng btrfs_commit_transaction(h, root); 360a22285a6SYan, Zheng goto again; 361a22285a6SYan, Zheng } 3629ed74f2dSJosef Bacik 363b5009945SJosef Bacik if (num_bytes) { 3648c2a3ca2SJosef Bacik trace_btrfs_space_reservation(root->fs_info, "transaction", 3652bcc0328SLiu Bo h->transid, num_bytes, 1); 366b5009945SJosef Bacik h->block_rsv = &root->fs_info->trans_block_rsv; 367b5009945SJosef Bacik h->bytes_reserved = num_bytes; 368a22285a6SYan, Zheng } 369a22285a6SYan, Zheng 3702a1eb461SJosef Bacik got_it: 371a4abeea4SJosef Bacik btrfs_record_root_in_trans(h, root); 372a22285a6SYan, Zheng 373a22285a6SYan, Zheng if (!current->journal_info && type != TRANS_USERSPACE) 374a22285a6SYan, Zheng current->journal_info = h; 37579154b1bSChris Mason return h; 37679154b1bSChris Mason } 37779154b1bSChris Mason 378f9295749SChris Mason struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 379a22285a6SYan, Zheng int num_items) 380f9295749SChris Mason { 381a22285a6SYan, Zheng return start_transaction(root, num_items, TRANS_START); 382f9295749SChris Mason } 3837a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) 384f9295749SChris Mason { 385a22285a6SYan, Zheng return start_transaction(root, 0, TRANS_JOIN); 386f9295749SChris Mason } 387f9295749SChris Mason 3887a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) 3890af3d00bSJosef Bacik { 3900af3d00bSJosef Bacik return start_transaction(root, 0, TRANS_JOIN_NOLOCK); 3910af3d00bSJosef Bacik } 3920af3d00bSJosef Bacik 3937a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) 3949ca9ee09SSage Weil { 3957a7eaa40SJosef Bacik return start_transaction(root, 0, TRANS_USERSPACE); 3969ca9ee09SSage Weil } 3979ca9ee09SSage Weil 398d352ac68SChris Mason /* wait for a transaction commit to be fully complete */ 399b9c8300cSLi Zefan static noinline void wait_for_commit(struct btrfs_root *root, 40089ce8a63SChris Mason struct btrfs_transaction *commit) 40189ce8a63SChris Mason { 40272d63ed6SLi Zefan wait_event(commit->commit_wait, commit->commit_done); 40389ce8a63SChris Mason } 40489ce8a63SChris Mason 40546204592SSage Weil int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) 40646204592SSage Weil { 40746204592SSage Weil struct btrfs_transaction *cur_trans = NULL, *t; 40846204592SSage Weil int ret; 40946204592SSage Weil 41046204592SSage Weil ret = 0; 41146204592SSage Weil if (transid) { 41246204592SSage Weil if (transid <= root->fs_info->last_trans_committed) 413a4abeea4SJosef Bacik goto out; 41446204592SSage Weil 41546204592SSage Weil /* find specified transaction */ 416a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 41746204592SSage Weil list_for_each_entry(t, &root->fs_info->trans_list, list) { 41846204592SSage Weil if (t->transid == transid) { 41946204592SSage Weil cur_trans = t; 420a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 42146204592SSage Weil break; 42246204592SSage Weil } 42346204592SSage Weil if (t->transid > transid) 42446204592SSage Weil break; 42546204592SSage Weil } 426a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 42746204592SSage Weil ret = -EINVAL; 42846204592SSage Weil if (!cur_trans) 429a4abeea4SJosef Bacik goto out; /* bad transid */ 43046204592SSage Weil } else { 43146204592SSage Weil /* find newest transaction that is committing | committed */ 432a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 43346204592SSage Weil list_for_each_entry_reverse(t, &root->fs_info->trans_list, 43446204592SSage Weil list) { 43546204592SSage Weil if (t->in_commit) { 43646204592SSage Weil if (t->commit_done) 4373473f3c0SJosef Bacik break; 43846204592SSage Weil cur_trans = t; 439a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 44046204592SSage Weil break; 44146204592SSage Weil } 44246204592SSage Weil } 443a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 44446204592SSage Weil if (!cur_trans) 445a4abeea4SJosef Bacik goto out; /* nothing committing|committed */ 44646204592SSage Weil } 44746204592SSage Weil 44846204592SSage Weil wait_for_commit(root, cur_trans); 44946204592SSage Weil 45046204592SSage Weil put_transaction(cur_trans); 45146204592SSage Weil ret = 0; 452a4abeea4SJosef Bacik out: 45346204592SSage Weil return ret; 45446204592SSage Weil } 45546204592SSage Weil 45637d1aeeeSChris Mason void btrfs_throttle(struct btrfs_root *root) 45737d1aeeeSChris Mason { 458a4abeea4SJosef Bacik if (!atomic_read(&root->fs_info->open_ioctl_trans)) 45937d1aeeeSChris Mason wait_current_trans(root); 46037d1aeeeSChris Mason } 46137d1aeeeSChris Mason 4628929ecfaSYan, Zheng static int should_end_transaction(struct btrfs_trans_handle *trans, 4638929ecfaSYan, Zheng struct btrfs_root *root) 4648929ecfaSYan, Zheng { 4658929ecfaSYan, Zheng int ret; 46636ba022aSJosef Bacik 46736ba022aSJosef Bacik ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); 4688929ecfaSYan, Zheng return ret ? 1 : 0; 4698929ecfaSYan, Zheng } 4708929ecfaSYan, Zheng 4718929ecfaSYan, Zheng int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 4728929ecfaSYan, Zheng struct btrfs_root *root) 4738929ecfaSYan, Zheng { 4748929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 4759c8d86dbSJosef Bacik struct btrfs_block_rsv *rsv = trans->block_rsv; 4768929ecfaSYan, Zheng int updates; 47749b25e05SJeff Mahoney int err; 4788929ecfaSYan, Zheng 479a4abeea4SJosef Bacik smp_mb(); 4808929ecfaSYan, Zheng if (cur_trans->blocked || cur_trans->delayed_refs.flushing) 4818929ecfaSYan, Zheng return 1; 4828929ecfaSYan, Zheng 4839c8d86dbSJosef Bacik /* 4849c8d86dbSJosef Bacik * We need to do this in case we're deleting csums so the global block 4859c8d86dbSJosef Bacik * rsv get's used instead of the csum block rsv. 4869c8d86dbSJosef Bacik */ 4879c8d86dbSJosef Bacik trans->block_rsv = NULL; 4889c8d86dbSJosef Bacik 4898929ecfaSYan, Zheng updates = trans->delayed_ref_updates; 4908929ecfaSYan, Zheng trans->delayed_ref_updates = 0; 49149b25e05SJeff Mahoney if (updates) { 49249b25e05SJeff Mahoney err = btrfs_run_delayed_refs(trans, root, updates); 49349b25e05SJeff Mahoney if (err) /* Error code will also eval true */ 49449b25e05SJeff Mahoney return err; 49549b25e05SJeff Mahoney } 4968929ecfaSYan, Zheng 4979c8d86dbSJosef Bacik trans->block_rsv = rsv; 4989c8d86dbSJosef Bacik 4998929ecfaSYan, Zheng return should_end_transaction(trans, root); 5008929ecfaSYan, Zheng } 5018929ecfaSYan, Zheng 50289ce8a63SChris Mason static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, 5030af3d00bSJosef Bacik struct btrfs_root *root, int throttle, int lock) 50479154b1bSChris Mason { 5058929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 506ab78c84dSChris Mason struct btrfs_fs_info *info = root->fs_info; 507c3e69d58SChris Mason int count = 0; 5084edc2ca3SDave Jones int err = 0; 509d6e4a428SChris Mason 5102a1eb461SJosef Bacik if (--trans->use_count) { 5112a1eb461SJosef Bacik trans->block_rsv = trans->orig_rsv; 5122a1eb461SJosef Bacik return 0; 5132a1eb461SJosef Bacik } 5142a1eb461SJosef Bacik 515b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 5164c13d758SJosef Bacik trans->block_rsv = NULL; 517d13603efSArne Jansen /* 518d13603efSArne Jansen * the same root has to be passed to start_transaction and 519d13603efSArne Jansen * end_transaction. Subvolume quota depends on this. 520d13603efSArne Jansen */ 521d13603efSArne Jansen WARN_ON(trans->root != root); 522203bf287SChris Mason while (count < 2) { 523c3e69d58SChris Mason unsigned long cur = trans->delayed_ref_updates; 524c3e69d58SChris Mason trans->delayed_ref_updates = 0; 525c3e69d58SChris Mason if (cur && 526c3e69d58SChris Mason trans->transaction->delayed_refs.num_heads_ready > 64) { 527c3e69d58SChris Mason trans->delayed_ref_updates = 0; 528c3e69d58SChris Mason btrfs_run_delayed_refs(trans, root, cur); 529c3e69d58SChris Mason } else { 530c3e69d58SChris Mason break; 531c3e69d58SChris Mason } 532c3e69d58SChris Mason count++; 53356bec294SChris Mason } 53456bec294SChris Mason 535a4abeea4SJosef Bacik if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && 536a4abeea4SJosef Bacik should_end_transaction(trans, root)) { 5378929ecfaSYan, Zheng trans->transaction->blocked = 1; 538a4abeea4SJosef Bacik smp_wmb(); 539a4abeea4SJosef Bacik } 5408929ecfaSYan, Zheng 5410af3d00bSJosef Bacik if (lock && cur_trans->blocked && !cur_trans->in_commit) { 54281317fdeSJosef Bacik if (throttle) { 54381317fdeSJosef Bacik /* 54481317fdeSJosef Bacik * We may race with somebody else here so end up having 54581317fdeSJosef Bacik * to call end_transaction on ourselves again, so inc 54681317fdeSJosef Bacik * our use_count. 54781317fdeSJosef Bacik */ 54881317fdeSJosef Bacik trans->use_count++; 5498929ecfaSYan, Zheng return btrfs_commit_transaction(trans, root); 55081317fdeSJosef Bacik } else { 5518929ecfaSYan, Zheng wake_up_process(info->transaction_kthread); 5528929ecfaSYan, Zheng } 55381317fdeSJosef Bacik } 5548929ecfaSYan, Zheng 5558929ecfaSYan, Zheng WARN_ON(cur_trans != info->running_transaction); 55613c5a93eSJosef Bacik WARN_ON(atomic_read(&cur_trans->num_writers) < 1); 55713c5a93eSJosef Bacik atomic_dec(&cur_trans->num_writers); 55889ce8a63SChris Mason 55999d16cbcSSage Weil smp_mb(); 56079154b1bSChris Mason if (waitqueue_active(&cur_trans->writer_wait)) 56179154b1bSChris Mason wake_up(&cur_trans->writer_wait); 56279154b1bSChris Mason put_transaction(cur_trans); 5639ed74f2dSJosef Bacik 5649ed74f2dSJosef Bacik if (current->journal_info == trans) 5659ed74f2dSJosef Bacik current->journal_info = NULL; 566ab78c84dSChris Mason 56724bbcf04SYan, Zheng if (throttle) 56824bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 56924bbcf04SYan, Zheng 57049b25e05SJeff Mahoney if (trans->aborted || 57149b25e05SJeff Mahoney root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 5724edc2ca3SDave Jones err = -EIO; 57349b25e05SJeff Mahoney } 57449b25e05SJeff Mahoney 5754edc2ca3SDave Jones memset(trans, 0, sizeof(*trans)); 5764edc2ca3SDave Jones kmem_cache_free(btrfs_trans_handle_cachep, trans); 5774edc2ca3SDave Jones return err; 57879154b1bSChris Mason } 57979154b1bSChris Mason 58089ce8a63SChris Mason int btrfs_end_transaction(struct btrfs_trans_handle *trans, 58189ce8a63SChris Mason struct btrfs_root *root) 58289ce8a63SChris Mason { 58316cdcec7SMiao Xie int ret; 58416cdcec7SMiao Xie 58516cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 0, 1); 58616cdcec7SMiao Xie if (ret) 58716cdcec7SMiao Xie return ret; 58816cdcec7SMiao Xie return 0; 58989ce8a63SChris Mason } 59089ce8a63SChris Mason 59189ce8a63SChris Mason int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 59289ce8a63SChris Mason struct btrfs_root *root) 59389ce8a63SChris Mason { 59416cdcec7SMiao Xie int ret; 59516cdcec7SMiao Xie 59616cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 1, 1); 59716cdcec7SMiao Xie if (ret) 59816cdcec7SMiao Xie return ret; 59916cdcec7SMiao Xie return 0; 6000af3d00bSJosef Bacik } 6010af3d00bSJosef Bacik 6020af3d00bSJosef Bacik int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, 6030af3d00bSJosef Bacik struct btrfs_root *root) 6040af3d00bSJosef Bacik { 60516cdcec7SMiao Xie int ret; 60616cdcec7SMiao Xie 60716cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 0, 0); 60816cdcec7SMiao Xie if (ret) 60916cdcec7SMiao Xie return ret; 61016cdcec7SMiao Xie return 0; 61116cdcec7SMiao Xie } 61216cdcec7SMiao Xie 61316cdcec7SMiao Xie int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans, 61416cdcec7SMiao Xie struct btrfs_root *root) 61516cdcec7SMiao Xie { 61616cdcec7SMiao Xie return __btrfs_end_transaction(trans, root, 1, 1); 61789ce8a63SChris Mason } 61889ce8a63SChris Mason 619d352ac68SChris Mason /* 620d352ac68SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 621d352ac68SChris Mason * them in one of two extent_io trees. This is used to make sure all of 622690587d1SChris Mason * those extents are sent to disk but does not wait on them 623d352ac68SChris Mason */ 624690587d1SChris Mason int btrfs_write_marked_extents(struct btrfs_root *root, 6258cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 62679154b1bSChris Mason { 627777e6bd7SChris Mason int err = 0; 6287c4452b9SChris Mason int werr = 0; 6291728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 630777e6bd7SChris Mason u64 start = 0; 6315f39d397SChris Mason u64 end; 6327c4452b9SChris Mason 6331728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 6341728366eSJosef Bacik mark)) { 6351728366eSJosef Bacik convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, mark, 6361728366eSJosef Bacik GFP_NOFS); 6371728366eSJosef Bacik err = filemap_fdatawrite_range(mapping, start, end); 6387c4452b9SChris Mason if (err) 6397c4452b9SChris Mason werr = err; 6401728366eSJosef Bacik cond_resched(); 6411728366eSJosef Bacik start = end + 1; 6427c4452b9SChris Mason } 643690587d1SChris Mason if (err) 644690587d1SChris Mason werr = err; 645690587d1SChris Mason return werr; 646690587d1SChris Mason } 647690587d1SChris Mason 648690587d1SChris Mason /* 649690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 650690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 651690587d1SChris Mason * those extents are on disk for transaction or log commit. We wait 652690587d1SChris Mason * on all the pages and clear them from the dirty pages state tree 653690587d1SChris Mason */ 654690587d1SChris Mason int btrfs_wait_marked_extents(struct btrfs_root *root, 6558cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 656690587d1SChris Mason { 657690587d1SChris Mason int err = 0; 658690587d1SChris Mason int werr = 0; 6591728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 660690587d1SChris Mason u64 start = 0; 661690587d1SChris Mason u64 end; 662690587d1SChris Mason 6631728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 6641728366eSJosef Bacik EXTENT_NEED_WAIT)) { 6651728366eSJosef Bacik clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS); 6661728366eSJosef Bacik err = filemap_fdatawait_range(mapping, start, end); 667777e6bd7SChris Mason if (err) 668777e6bd7SChris Mason werr = err; 669777e6bd7SChris Mason cond_resched(); 6701728366eSJosef Bacik start = end + 1; 671777e6bd7SChris Mason } 6727c4452b9SChris Mason if (err) 6737c4452b9SChris Mason werr = err; 6747c4452b9SChris Mason return werr; 67579154b1bSChris Mason } 67679154b1bSChris Mason 677690587d1SChris Mason /* 678690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 679690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 680690587d1SChris Mason * those extents are on disk for transaction or log commit 681690587d1SChris Mason */ 682690587d1SChris Mason int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, 6838cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 684690587d1SChris Mason { 685690587d1SChris Mason int ret; 686690587d1SChris Mason int ret2; 687690587d1SChris Mason 6888cef4e16SYan, Zheng ret = btrfs_write_marked_extents(root, dirty_pages, mark); 6898cef4e16SYan, Zheng ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); 690bf0da8c1SChris Mason 691bf0da8c1SChris Mason if (ret) 692bf0da8c1SChris Mason return ret; 693bf0da8c1SChris Mason if (ret2) 694bf0da8c1SChris Mason return ret2; 695bf0da8c1SChris Mason return 0; 696690587d1SChris Mason } 697690587d1SChris Mason 698d0c803c4SChris Mason int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, 699d0c803c4SChris Mason struct btrfs_root *root) 700d0c803c4SChris Mason { 701d0c803c4SChris Mason if (!trans || !trans->transaction) { 702d0c803c4SChris Mason struct inode *btree_inode; 703d0c803c4SChris Mason btree_inode = root->fs_info->btree_inode; 704d0c803c4SChris Mason return filemap_write_and_wait(btree_inode->i_mapping); 705d0c803c4SChris Mason } 706d0c803c4SChris Mason return btrfs_write_and_wait_marked_extents(root, 7078cef4e16SYan, Zheng &trans->transaction->dirty_pages, 7088cef4e16SYan, Zheng EXTENT_DIRTY); 709d0c803c4SChris Mason } 710d0c803c4SChris Mason 711d352ac68SChris Mason /* 712d352ac68SChris Mason * this is used to update the root pointer in the tree of tree roots. 713d352ac68SChris Mason * 714d352ac68SChris Mason * But, in the case of the extent allocation tree, updating the root 715d352ac68SChris Mason * pointer may allocate blocks which may change the root of the extent 716d352ac68SChris Mason * allocation tree. 717d352ac68SChris Mason * 718d352ac68SChris Mason * So, this loops and repeats and makes sure the cowonly root didn't 719d352ac68SChris Mason * change while the root pointer was being updated in the metadata. 720d352ac68SChris Mason */ 7210b86a832SChris Mason static int update_cowonly_root(struct btrfs_trans_handle *trans, 72279154b1bSChris Mason struct btrfs_root *root) 72379154b1bSChris Mason { 72479154b1bSChris Mason int ret; 7250b86a832SChris Mason u64 old_root_bytenr; 72686b9f2ecSYan, Zheng u64 old_root_used; 7270b86a832SChris Mason struct btrfs_root *tree_root = root->fs_info->tree_root; 72879154b1bSChris Mason 72986b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 7300b86a832SChris Mason btrfs_write_dirty_block_groups(trans, root); 73156bec294SChris Mason 73279154b1bSChris Mason while (1) { 7330b86a832SChris Mason old_root_bytenr = btrfs_root_bytenr(&root->root_item); 73486b9f2ecSYan, Zheng if (old_root_bytenr == root->node->start && 73586b9f2ecSYan, Zheng old_root_used == btrfs_root_used(&root->root_item)) 73679154b1bSChris Mason break; 73787ef2bb4SChris Mason 7385d4f98a2SYan Zheng btrfs_set_root_node(&root->root_item, root->node); 73979154b1bSChris Mason ret = btrfs_update_root(trans, tree_root, 7400b86a832SChris Mason &root->root_key, 7410b86a832SChris Mason &root->root_item); 74249b25e05SJeff Mahoney if (ret) 74349b25e05SJeff Mahoney return ret; 74456bec294SChris Mason 74586b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 7464a8c9a62SYan Zheng ret = btrfs_write_dirty_block_groups(trans, root); 74749b25e05SJeff Mahoney if (ret) 74849b25e05SJeff Mahoney return ret; 7490b86a832SChris Mason } 750276e680dSYan Zheng 751276e680dSYan Zheng if (root != root->fs_info->extent_root) 752817d52f8SJosef Bacik switch_commit_root(root); 753276e680dSYan Zheng 7540b86a832SChris Mason return 0; 7550b86a832SChris Mason } 7560b86a832SChris Mason 757d352ac68SChris Mason /* 758d352ac68SChris Mason * update all the cowonly tree roots on disk 75949b25e05SJeff Mahoney * 76049b25e05SJeff Mahoney * The error handling in this function may not be obvious. Any of the 76149b25e05SJeff Mahoney * failures will cause the file system to go offline. We still need 76249b25e05SJeff Mahoney * to clean up the delayed refs. 763d352ac68SChris Mason */ 7645d4f98a2SYan Zheng static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, 7650b86a832SChris Mason struct btrfs_root *root) 7660b86a832SChris Mason { 7670b86a832SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 7680b86a832SChris Mason struct list_head *next; 76984234f3aSYan Zheng struct extent_buffer *eb; 77056bec294SChris Mason int ret; 77184234f3aSYan Zheng 77256bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 77349b25e05SJeff Mahoney if (ret) 77449b25e05SJeff Mahoney return ret; 77587ef2bb4SChris Mason 77684234f3aSYan Zheng eb = btrfs_lock_root_node(fs_info->tree_root); 77749b25e05SJeff Mahoney ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 77849b25e05SJeff Mahoney 0, &eb); 77984234f3aSYan Zheng btrfs_tree_unlock(eb); 78084234f3aSYan Zheng free_extent_buffer(eb); 7810b86a832SChris Mason 78249b25e05SJeff Mahoney if (ret) 78349b25e05SJeff Mahoney return ret; 78449b25e05SJeff Mahoney 78556bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 78649b25e05SJeff Mahoney if (ret) 78749b25e05SJeff Mahoney return ret; 78887ef2bb4SChris Mason 789733f4fbbSStefan Behrens ret = btrfs_run_dev_stats(trans, root->fs_info); 790733f4fbbSStefan Behrens BUG_ON(ret); 791733f4fbbSStefan Behrens 7920b86a832SChris Mason while (!list_empty(&fs_info->dirty_cowonly_roots)) { 7930b86a832SChris Mason next = fs_info->dirty_cowonly_roots.next; 7940b86a832SChris Mason list_del_init(next); 7950b86a832SChris Mason root = list_entry(next, struct btrfs_root, dirty_list); 79687ef2bb4SChris Mason 79749b25e05SJeff Mahoney ret = update_cowonly_root(trans, root); 79849b25e05SJeff Mahoney if (ret) 79949b25e05SJeff Mahoney return ret; 80079154b1bSChris Mason } 801276e680dSYan Zheng 802276e680dSYan Zheng down_write(&fs_info->extent_commit_sem); 803276e680dSYan Zheng switch_commit_root(fs_info->extent_root); 804276e680dSYan Zheng up_write(&fs_info->extent_commit_sem); 805276e680dSYan Zheng 80679154b1bSChris Mason return 0; 80779154b1bSChris Mason } 80879154b1bSChris Mason 809d352ac68SChris Mason /* 810d352ac68SChris Mason * dead roots are old snapshots that need to be deleted. This allocates 811d352ac68SChris Mason * a dirty root struct and adds it into the list of dead roots that need to 812d352ac68SChris Mason * be deleted 813d352ac68SChris Mason */ 8145d4f98a2SYan Zheng int btrfs_add_dead_root(struct btrfs_root *root) 8155eda7b5eSChris Mason { 816a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 8175d4f98a2SYan Zheng list_add(&root->root_list, &root->fs_info->dead_roots); 818a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 8195eda7b5eSChris Mason return 0; 8205eda7b5eSChris Mason } 8215eda7b5eSChris Mason 822d352ac68SChris Mason /* 8235d4f98a2SYan Zheng * update all the cowonly tree roots on disk 824d352ac68SChris Mason */ 8255d4f98a2SYan Zheng static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, 8265d4f98a2SYan Zheng struct btrfs_root *root) 8270f7d52f4SChris Mason { 8280f7d52f4SChris Mason struct btrfs_root *gang[8]; 8295d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 8300f7d52f4SChris Mason int i; 8310f7d52f4SChris Mason int ret; 83254aa1f4dSChris Mason int err = 0; 83354aa1f4dSChris Mason 834a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 8350f7d52f4SChris Mason while (1) { 8365d4f98a2SYan Zheng ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, 8375d4f98a2SYan Zheng (void **)gang, 0, 8380f7d52f4SChris Mason ARRAY_SIZE(gang), 8390f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 8400f7d52f4SChris Mason if (ret == 0) 8410f7d52f4SChris Mason break; 8420f7d52f4SChris Mason for (i = 0; i < ret; i++) { 8430f7d52f4SChris Mason root = gang[i]; 8445d4f98a2SYan Zheng radix_tree_tag_clear(&fs_info->fs_roots_radix, 8452619ba1fSChris Mason (unsigned long)root->root_key.objectid, 8460f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 847a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 84831153d81SYan Zheng 849e02119d5SChris Mason btrfs_free_log(trans, root); 8505d4f98a2SYan Zheng btrfs_update_reloc_root(trans, root); 851d68fc57bSYan, Zheng btrfs_orphan_commit_root(trans, root); 852e02119d5SChris Mason 85382d5902dSLi Zefan btrfs_save_ino_cache(root, trans); 85482d5902dSLi Zefan 855f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 856f1ebcc74SLiu Bo root->force_cow = 0; 857f1ebcc74SLiu Bo smp_wmb(); 858f1ebcc74SLiu Bo 859978d910dSYan Zheng if (root->commit_root != root->node) { 860581bb050SLi Zefan mutex_lock(&root->fs_commit_mutex); 861817d52f8SJosef Bacik switch_commit_root(root); 862581bb050SLi Zefan btrfs_unpin_free_ino(root); 863581bb050SLi Zefan mutex_unlock(&root->fs_commit_mutex); 864581bb050SLi Zefan 865978d910dSYan Zheng btrfs_set_root_node(&root->root_item, 866978d910dSYan Zheng root->node); 867978d910dSYan Zheng } 86831153d81SYan Zheng 8695d4f98a2SYan Zheng err = btrfs_update_root(trans, fs_info->tree_root, 8700f7d52f4SChris Mason &root->root_key, 8710f7d52f4SChris Mason &root->root_item); 872a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 87354aa1f4dSChris Mason if (err) 87454aa1f4dSChris Mason break; 8750f7d52f4SChris Mason } 8769f3a7427SChris Mason } 877a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 87854aa1f4dSChris Mason return err; 8790f7d52f4SChris Mason } 8800f7d52f4SChris Mason 881d352ac68SChris Mason /* 882d352ac68SChris Mason * defrag a given btree. If cacheonly == 1, this won't read from the disk, 883d352ac68SChris Mason * otherwise every leaf in the btree is read and defragged. 884d352ac68SChris Mason */ 885e9d0b13bSChris Mason int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) 886e9d0b13bSChris Mason { 887e9d0b13bSChris Mason struct btrfs_fs_info *info = root->fs_info; 888e9d0b13bSChris Mason struct btrfs_trans_handle *trans; 8898929ecfaSYan, Zheng int ret; 890d3c2fdcfSChris Mason unsigned long nr; 891e9d0b13bSChris Mason 8928929ecfaSYan, Zheng if (xchg(&root->defrag_running, 1)) 893e9d0b13bSChris Mason return 0; 8948929ecfaSYan, Zheng 8956b80053dSChris Mason while (1) { 8968929ecfaSYan, Zheng trans = btrfs_start_transaction(root, 0); 8978929ecfaSYan, Zheng if (IS_ERR(trans)) 8988929ecfaSYan, Zheng return PTR_ERR(trans); 8998929ecfaSYan, Zheng 900e9d0b13bSChris Mason ret = btrfs_defrag_leaves(trans, root, cacheonly); 9018929ecfaSYan, Zheng 902d3c2fdcfSChris Mason nr = trans->blocks_used; 903e9d0b13bSChris Mason btrfs_end_transaction(trans, root); 904d3c2fdcfSChris Mason btrfs_btree_balance_dirty(info->tree_root, nr); 905e9d0b13bSChris Mason cond_resched(); 906e9d0b13bSChris Mason 9077841cb28SDavid Sterba if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) 908e9d0b13bSChris Mason break; 909e9d0b13bSChris Mason } 910e9d0b13bSChris Mason root->defrag_running = 0; 9118929ecfaSYan, Zheng return ret; 912e9d0b13bSChris Mason } 913e9d0b13bSChris Mason 914d352ac68SChris Mason /* 915d352ac68SChris Mason * new snapshots need to be created at a very specific time in the 916d352ac68SChris Mason * transaction commit. This does the actual creation 917d352ac68SChris Mason */ 91880b6794dSChris Mason static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, 9193063d29fSChris Mason struct btrfs_fs_info *fs_info, 9203063d29fSChris Mason struct btrfs_pending_snapshot *pending) 9213063d29fSChris Mason { 9223063d29fSChris Mason struct btrfs_key key; 92380b6794dSChris Mason struct btrfs_root_item *new_root_item; 9243063d29fSChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 9253063d29fSChris Mason struct btrfs_root *root = pending->root; 9266bdb72deSSage Weil struct btrfs_root *parent_root; 92798c9942aSLiu Bo struct btrfs_block_rsv *rsv; 9286bdb72deSSage Weil struct inode *parent_inode; 9296a912213SJosef Bacik struct dentry *parent; 930a22285a6SYan, Zheng struct dentry *dentry; 9313063d29fSChris Mason struct extent_buffer *tmp; 932925baeddSChris Mason struct extent_buffer *old; 9333063d29fSChris Mason int ret; 934d68fc57bSYan, Zheng u64 to_reserve = 0; 9356bdb72deSSage Weil u64 index = 0; 936a22285a6SYan, Zheng u64 objectid; 937b83cc969SLi Zefan u64 root_flags; 9383063d29fSChris Mason 93998c9942aSLiu Bo rsv = trans->block_rsv; 94098c9942aSLiu Bo 94180b6794dSChris Mason new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); 94280b6794dSChris Mason if (!new_root_item) { 94349b25e05SJeff Mahoney ret = pending->error = -ENOMEM; 94480b6794dSChris Mason goto fail; 94580b6794dSChris Mason } 946a22285a6SYan, Zheng 947581bb050SLi Zefan ret = btrfs_find_free_objectid(tree_root, &objectid); 948a22285a6SYan, Zheng if (ret) { 949a22285a6SYan, Zheng pending->error = ret; 9503063d29fSChris Mason goto fail; 951a22285a6SYan, Zheng } 9523063d29fSChris Mason 9533fd0a558SYan, Zheng btrfs_reloc_pre_snapshot(trans, pending, &to_reserve); 954d68fc57bSYan, Zheng 955d68fc57bSYan, Zheng if (to_reserve > 0) { 95662f30c54SMiao Xie ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv, 9578bb8ab2eSJosef Bacik to_reserve); 958d68fc57bSYan, Zheng if (ret) { 959d68fc57bSYan, Zheng pending->error = ret; 960d68fc57bSYan, Zheng goto fail; 961d68fc57bSYan, Zheng } 962d68fc57bSYan, Zheng } 963d68fc57bSYan, Zheng 9643063d29fSChris Mason key.objectid = objectid; 965a22285a6SYan, Zheng key.offset = (u64)-1; 966a22285a6SYan, Zheng key.type = BTRFS_ROOT_ITEM_KEY; 9673063d29fSChris Mason 968a22285a6SYan, Zheng trans->block_rsv = &pending->block_rsv; 9696bdb72deSSage Weil 970a22285a6SYan, Zheng dentry = pending->dentry; 9716a912213SJosef Bacik parent = dget_parent(dentry); 9726a912213SJosef Bacik parent_inode = parent->d_inode; 973a22285a6SYan, Zheng parent_root = BTRFS_I(parent_inode)->root; 9747585717fSChris Mason record_root_in_trans(trans, parent_root); 975a22285a6SYan, Zheng 9766bdb72deSSage Weil /* 9776bdb72deSSage Weil * insert the directory item 9786bdb72deSSage Weil */ 9796bdb72deSSage Weil ret = btrfs_set_inode_index(parent_inode, &index); 98049b25e05SJeff Mahoney BUG_ON(ret); /* -ENOMEM */ 9816bdb72deSSage Weil ret = btrfs_insert_dir_item(trans, parent_root, 982a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len, 98316cdcec7SMiao Xie parent_inode, &key, 984a22285a6SYan, Zheng BTRFS_FT_DIR, index); 98579787eaaSJeff Mahoney if (ret == -EEXIST) { 986fe66a05aSChris Mason pending->error = -EEXIST; 987fe66a05aSChris Mason dput(parent); 988fe66a05aSChris Mason goto fail; 98979787eaaSJeff Mahoney } else if (ret) { 99079787eaaSJeff Mahoney goto abort_trans_dput; 99179787eaaSJeff Mahoney } 9926bdb72deSSage Weil 993a22285a6SYan, Zheng btrfs_i_size_write(parent_inode, parent_inode->i_size + 994a22285a6SYan, Zheng dentry->d_name.len * 2); 9956bdb72deSSage Weil ret = btrfs_update_inode(trans, parent_root, parent_inode); 99649b25e05SJeff Mahoney if (ret) 99779787eaaSJeff Mahoney goto abort_trans_dput; 9986bdb72deSSage Weil 999e999376fSChris Mason /* 1000e999376fSChris Mason * pull in the delayed directory update 1001e999376fSChris Mason * and the delayed inode item 1002e999376fSChris Mason * otherwise we corrupt the FS during 1003e999376fSChris Mason * snapshot 1004e999376fSChris Mason */ 1005e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 100679787eaaSJeff Mahoney if (ret) { /* Transaction aborted */ 100779787eaaSJeff Mahoney dput(parent); 100849b25e05SJeff Mahoney goto fail; 100979787eaaSJeff Mahoney } 1010e999376fSChris Mason 10117585717fSChris Mason record_root_in_trans(trans, root); 10126bdb72deSSage Weil btrfs_set_root_last_snapshot(&root->root_item, trans->transid); 10136bdb72deSSage Weil memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); 101408fe4db1SLi Zefan btrfs_check_and_init_root_item(new_root_item); 10156bdb72deSSage Weil 1016b83cc969SLi Zefan root_flags = btrfs_root_flags(new_root_item); 1017b83cc969SLi Zefan if (pending->readonly) 1018b83cc969SLi Zefan root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; 1019b83cc969SLi Zefan else 1020b83cc969SLi Zefan root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; 1021b83cc969SLi Zefan btrfs_set_root_flags(new_root_item, root_flags); 1022b83cc969SLi Zefan 1023925baeddSChris Mason old = btrfs_lock_root_node(root); 102449b25e05SJeff Mahoney ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); 102579787eaaSJeff Mahoney if (ret) { 102679787eaaSJeff Mahoney btrfs_tree_unlock(old); 102779787eaaSJeff Mahoney free_extent_buffer(old); 102879787eaaSJeff Mahoney goto abort_trans_dput; 102979787eaaSJeff Mahoney } 103049b25e05SJeff Mahoney 10315d4f98a2SYan Zheng btrfs_set_lock_blocking(old); 10323063d29fSChris Mason 103349b25e05SJeff Mahoney ret = btrfs_copy_root(trans, root, old, &tmp, objectid); 103479787eaaSJeff Mahoney /* clean up in any case */ 1035925baeddSChris Mason btrfs_tree_unlock(old); 1036925baeddSChris Mason free_extent_buffer(old); 103779787eaaSJeff Mahoney if (ret) 103879787eaaSJeff Mahoney goto abort_trans_dput; 10393063d29fSChris Mason 1040f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 1041f1ebcc74SLiu Bo root->force_cow = 1; 1042f1ebcc74SLiu Bo smp_wmb(); 1043f1ebcc74SLiu Bo 10445d4f98a2SYan Zheng btrfs_set_root_node(new_root_item, tmp); 1045a22285a6SYan, Zheng /* record when the snapshot was created in key.offset */ 1046a22285a6SYan, Zheng key.offset = trans->transid; 1047a22285a6SYan, Zheng ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); 1048925baeddSChris Mason btrfs_tree_unlock(tmp); 10493063d29fSChris Mason free_extent_buffer(tmp); 105049b25e05SJeff Mahoney if (ret) 105179787eaaSJeff Mahoney goto abort_trans_dput; 10520660b5afSChris Mason 1053a22285a6SYan, Zheng /* 1054a22285a6SYan, Zheng * insert root back/forward references 1055a22285a6SYan, Zheng */ 1056a22285a6SYan, Zheng ret = btrfs_add_root_ref(trans, tree_root, objectid, 1057a22285a6SYan, Zheng parent_root->root_key.objectid, 105833345d01SLi Zefan btrfs_ino(parent_inode), index, 1059a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len); 106079787eaaSJeff Mahoney dput(parent); 106149b25e05SJeff Mahoney if (ret) 106249b25e05SJeff Mahoney goto fail; 1063a22285a6SYan, Zheng 1064a22285a6SYan, Zheng key.offset = (u64)-1; 1065a22285a6SYan, Zheng pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); 106679787eaaSJeff Mahoney if (IS_ERR(pending->snap)) { 106779787eaaSJeff Mahoney ret = PTR_ERR(pending->snap); 106849b25e05SJeff Mahoney goto abort_trans; 106979787eaaSJeff Mahoney } 1070d68fc57bSYan, Zheng 107149b25e05SJeff Mahoney ret = btrfs_reloc_post_snapshot(trans, pending); 107249b25e05SJeff Mahoney if (ret) 107349b25e05SJeff Mahoney goto abort_trans; 107449b25e05SJeff Mahoney ret = 0; 10753063d29fSChris Mason fail: 10766bdb72deSSage Weil kfree(new_root_item); 107798c9942aSLiu Bo trans->block_rsv = rsv; 1078a22285a6SYan, Zheng btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1); 107949b25e05SJeff Mahoney return ret; 108049b25e05SJeff Mahoney 108179787eaaSJeff Mahoney abort_trans_dput: 108279787eaaSJeff Mahoney dput(parent); 108349b25e05SJeff Mahoney abort_trans: 108449b25e05SJeff Mahoney btrfs_abort_transaction(trans, root, ret); 108549b25e05SJeff Mahoney goto fail; 10863063d29fSChris Mason } 10873063d29fSChris Mason 1088d352ac68SChris Mason /* 1089d352ac68SChris Mason * create all the snapshots we've scheduled for creation 1090d352ac68SChris Mason */ 109180b6794dSChris Mason static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, 10923063d29fSChris Mason struct btrfs_fs_info *fs_info) 10933063d29fSChris Mason { 10943063d29fSChris Mason struct btrfs_pending_snapshot *pending; 10953063d29fSChris Mason struct list_head *head = &trans->transaction->pending_snapshots; 10963de4586cSChris Mason 1097fe66a05aSChris Mason list_for_each_entry(pending, head, list) 1098fe66a05aSChris Mason create_pending_snapshot(trans, fs_info, pending); 10993de4586cSChris Mason return 0; 11003de4586cSChris Mason } 11013de4586cSChris Mason 11025d4f98a2SYan Zheng static void update_super_roots(struct btrfs_root *root) 11035d4f98a2SYan Zheng { 11045d4f98a2SYan Zheng struct btrfs_root_item *root_item; 11055d4f98a2SYan Zheng struct btrfs_super_block *super; 11065d4f98a2SYan Zheng 11076c41761fSDavid Sterba super = root->fs_info->super_copy; 11085d4f98a2SYan Zheng 11095d4f98a2SYan Zheng root_item = &root->fs_info->chunk_root->root_item; 11105d4f98a2SYan Zheng super->chunk_root = root_item->bytenr; 11115d4f98a2SYan Zheng super->chunk_root_generation = root_item->generation; 11125d4f98a2SYan Zheng super->chunk_root_level = root_item->level; 11135d4f98a2SYan Zheng 11145d4f98a2SYan Zheng root_item = &root->fs_info->tree_root->root_item; 11155d4f98a2SYan Zheng super->root = root_item->bytenr; 11165d4f98a2SYan Zheng super->generation = root_item->generation; 11175d4f98a2SYan Zheng super->root_level = root_item->level; 111873bc1876SJosef Bacik if (btrfs_test_opt(root, SPACE_CACHE)) 11190af3d00bSJosef Bacik super->cache_generation = root_item->generation; 11205d4f98a2SYan Zheng } 11215d4f98a2SYan Zheng 1122f36f3042SChris Mason int btrfs_transaction_in_commit(struct btrfs_fs_info *info) 1123f36f3042SChris Mason { 1124f36f3042SChris Mason int ret = 0; 1125a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 1126f36f3042SChris Mason if (info->running_transaction) 1127f36f3042SChris Mason ret = info->running_transaction->in_commit; 1128a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 1129f36f3042SChris Mason return ret; 1130f36f3042SChris Mason } 1131f36f3042SChris Mason 11328929ecfaSYan, Zheng int btrfs_transaction_blocked(struct btrfs_fs_info *info) 11338929ecfaSYan, Zheng { 11348929ecfaSYan, Zheng int ret = 0; 1135a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 11368929ecfaSYan, Zheng if (info->running_transaction) 11378929ecfaSYan, Zheng ret = info->running_transaction->blocked; 1138a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 11398929ecfaSYan, Zheng return ret; 11408929ecfaSYan, Zheng } 11418929ecfaSYan, Zheng 1142bb9c12c9SSage Weil /* 1143bb9c12c9SSage Weil * wait for the current transaction commit to start and block subsequent 1144bb9c12c9SSage Weil * transaction joins 1145bb9c12c9SSage Weil */ 1146bb9c12c9SSage Weil static void wait_current_trans_commit_start(struct btrfs_root *root, 1147bb9c12c9SSage Weil struct btrfs_transaction *trans) 1148bb9c12c9SSage Weil { 114972d63ed6SLi Zefan wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit); 1150bb9c12c9SSage Weil } 1151bb9c12c9SSage Weil 1152bb9c12c9SSage Weil /* 1153bb9c12c9SSage Weil * wait for the current transaction to start and then become unblocked. 1154bb9c12c9SSage Weil * caller holds ref. 1155bb9c12c9SSage Weil */ 1156bb9c12c9SSage Weil static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, 1157bb9c12c9SSage Weil struct btrfs_transaction *trans) 1158bb9c12c9SSage Weil { 115972d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 116072d63ed6SLi Zefan trans->commit_done || (trans->in_commit && !trans->blocked)); 1161bb9c12c9SSage Weil } 1162bb9c12c9SSage Weil 1163bb9c12c9SSage Weil /* 1164bb9c12c9SSage Weil * commit transactions asynchronously. once btrfs_commit_transaction_async 1165bb9c12c9SSage Weil * returns, any subsequent transaction will not be allowed to join. 1166bb9c12c9SSage Weil */ 1167bb9c12c9SSage Weil struct btrfs_async_commit { 1168bb9c12c9SSage Weil struct btrfs_trans_handle *newtrans; 1169bb9c12c9SSage Weil struct btrfs_root *root; 1170bb9c12c9SSage Weil struct delayed_work work; 1171bb9c12c9SSage Weil }; 1172bb9c12c9SSage Weil 1173bb9c12c9SSage Weil static void do_async_commit(struct work_struct *work) 1174bb9c12c9SSage Weil { 1175bb9c12c9SSage Weil struct btrfs_async_commit *ac = 1176bb9c12c9SSage Weil container_of(work, struct btrfs_async_commit, work.work); 1177bb9c12c9SSage Weil 1178bb9c12c9SSage Weil btrfs_commit_transaction(ac->newtrans, ac->root); 1179bb9c12c9SSage Weil kfree(ac); 1180bb9c12c9SSage Weil } 1181bb9c12c9SSage Weil 1182bb9c12c9SSage Weil int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 1183bb9c12c9SSage Weil struct btrfs_root *root, 1184bb9c12c9SSage Weil int wait_for_unblock) 1185bb9c12c9SSage Weil { 1186bb9c12c9SSage Weil struct btrfs_async_commit *ac; 1187bb9c12c9SSage Weil struct btrfs_transaction *cur_trans; 1188bb9c12c9SSage Weil 1189bb9c12c9SSage Weil ac = kmalloc(sizeof(*ac), GFP_NOFS); 1190db5b493aSTsutomu Itoh if (!ac) 1191db5b493aSTsutomu Itoh return -ENOMEM; 1192bb9c12c9SSage Weil 1193bb9c12c9SSage Weil INIT_DELAYED_WORK(&ac->work, do_async_commit); 1194bb9c12c9SSage Weil ac->root = root; 11957a7eaa40SJosef Bacik ac->newtrans = btrfs_join_transaction(root); 11963612b495STsutomu Itoh if (IS_ERR(ac->newtrans)) { 11973612b495STsutomu Itoh int err = PTR_ERR(ac->newtrans); 11983612b495STsutomu Itoh kfree(ac); 11993612b495STsutomu Itoh return err; 12003612b495STsutomu Itoh } 1201bb9c12c9SSage Weil 1202bb9c12c9SSage Weil /* take transaction reference */ 1203bb9c12c9SSage Weil cur_trans = trans->transaction; 120413c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 1205bb9c12c9SSage Weil 1206bb9c12c9SSage Weil btrfs_end_transaction(trans, root); 1207bb9c12c9SSage Weil schedule_delayed_work(&ac->work, 0); 1208bb9c12c9SSage Weil 1209bb9c12c9SSage Weil /* wait for transaction to start and unblock */ 1210bb9c12c9SSage Weil if (wait_for_unblock) 1211bb9c12c9SSage Weil wait_current_trans_commit_start_and_unblock(root, cur_trans); 1212bb9c12c9SSage Weil else 1213bb9c12c9SSage Weil wait_current_trans_commit_start(root, cur_trans); 1214bb9c12c9SSage Weil 121538e88054SSage Weil if (current->journal_info == trans) 121638e88054SSage Weil current->journal_info = NULL; 121738e88054SSage Weil 121838e88054SSage Weil put_transaction(cur_trans); 1219bb9c12c9SSage Weil return 0; 1220bb9c12c9SSage Weil } 1221bb9c12c9SSage Weil 122249b25e05SJeff Mahoney 122349b25e05SJeff Mahoney static void cleanup_transaction(struct btrfs_trans_handle *trans, 12247b8b92afSJosef Bacik struct btrfs_root *root, int err) 122549b25e05SJeff Mahoney { 122649b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 122749b25e05SJeff Mahoney 122849b25e05SJeff Mahoney WARN_ON(trans->use_count > 1); 122949b25e05SJeff Mahoney 12307b8b92afSJosef Bacik btrfs_abort_transaction(trans, root, err); 12317b8b92afSJosef Bacik 123249b25e05SJeff Mahoney spin_lock(&root->fs_info->trans_lock); 123349b25e05SJeff Mahoney list_del_init(&cur_trans->list); 1234d7096fc3SJosef Bacik if (cur_trans == root->fs_info->running_transaction) { 1235d7096fc3SJosef Bacik root->fs_info->running_transaction = NULL; 1236d7096fc3SJosef Bacik root->fs_info->trans_no_join = 0; 1237d7096fc3SJosef Bacik } 123849b25e05SJeff Mahoney spin_unlock(&root->fs_info->trans_lock); 123949b25e05SJeff Mahoney 124049b25e05SJeff Mahoney btrfs_cleanup_one_transaction(trans->transaction, root); 124149b25e05SJeff Mahoney 124249b25e05SJeff Mahoney put_transaction(cur_trans); 124349b25e05SJeff Mahoney put_transaction(cur_trans); 124449b25e05SJeff Mahoney 124549b25e05SJeff Mahoney trace_btrfs_transaction_commit(root); 124649b25e05SJeff Mahoney 124749b25e05SJeff Mahoney btrfs_scrub_continue(root); 124849b25e05SJeff Mahoney 124949b25e05SJeff Mahoney if (current->journal_info == trans) 125049b25e05SJeff Mahoney current->journal_info = NULL; 125149b25e05SJeff Mahoney 125249b25e05SJeff Mahoney kmem_cache_free(btrfs_trans_handle_cachep, trans); 125349b25e05SJeff Mahoney } 125449b25e05SJeff Mahoney 1255bb9c12c9SSage Weil /* 1256bb9c12c9SSage Weil * btrfs_transaction state sequence: 1257bb9c12c9SSage Weil * in_commit = 0, blocked = 0 (initial) 1258bb9c12c9SSage Weil * in_commit = 1, blocked = 1 1259bb9c12c9SSage Weil * blocked = 0 1260bb9c12c9SSage Weil * commit_done = 1 1261bb9c12c9SSage Weil */ 126279154b1bSChris Mason int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 126379154b1bSChris Mason struct btrfs_root *root) 126479154b1bSChris Mason { 126515ee9bc7SJosef Bacik unsigned long joined = 0; 126649b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 12678fd17795SChris Mason struct btrfs_transaction *prev_trans = NULL; 126879154b1bSChris Mason DEFINE_WAIT(wait); 126949b25e05SJeff Mahoney int ret = -EIO; 127089573b9cSChris Mason int should_grow = 0; 127189573b9cSChris Mason unsigned long now = get_seconds(); 1272dccae999SSage Weil int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); 127379154b1bSChris Mason 12745a3f23d5SChris Mason btrfs_run_ordered_operations(root, 0); 12755a3f23d5SChris Mason 1276b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 12779c8d86dbSJosef Bacik trans->block_rsv = NULL; 12789c8d86dbSJosef Bacik 127949b25e05SJeff Mahoney if (cur_trans->aborted) 128049b25e05SJeff Mahoney goto cleanup_transaction; 128149b25e05SJeff Mahoney 128256bec294SChris Mason /* make a pass through all the delayed refs we have so far 128356bec294SChris Mason * any runnings procs may add more while we are here 128456bec294SChris Mason */ 128556bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 128649b25e05SJeff Mahoney if (ret) 128749b25e05SJeff Mahoney goto cleanup_transaction; 128856bec294SChris Mason 1289b7ec40d7SChris Mason cur_trans = trans->transaction; 129049b25e05SJeff Mahoney 129156bec294SChris Mason /* 129256bec294SChris Mason * set the flushing flag so procs in this transaction have to 129356bec294SChris Mason * start sending their work down. 129456bec294SChris Mason */ 1295b7ec40d7SChris Mason cur_trans->delayed_refs.flushing = 1; 129656bec294SChris Mason 1297c3e69d58SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 129849b25e05SJeff Mahoney if (ret) 129949b25e05SJeff Mahoney goto cleanup_transaction; 130056bec294SChris Mason 1301a4abeea4SJosef Bacik spin_lock(&cur_trans->commit_lock); 1302b7ec40d7SChris Mason if (cur_trans->in_commit) { 1303a4abeea4SJosef Bacik spin_unlock(&cur_trans->commit_lock); 130413c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 130549b25e05SJeff Mahoney ret = btrfs_end_transaction(trans, root); 1306ccd467d6SChris Mason 1307b9c8300cSLi Zefan wait_for_commit(root, cur_trans); 130815ee9bc7SJosef Bacik 130979154b1bSChris Mason put_transaction(cur_trans); 131015ee9bc7SJosef Bacik 131149b25e05SJeff Mahoney return ret; 131279154b1bSChris Mason } 13134313b399SChris Mason 13142c90e5d6SChris Mason trans->transaction->in_commit = 1; 1315f9295749SChris Mason trans->transaction->blocked = 1; 1316a4abeea4SJosef Bacik spin_unlock(&cur_trans->commit_lock); 1317bb9c12c9SSage Weil wake_up(&root->fs_info->transaction_blocked_wait); 1318bb9c12c9SSage Weil 1319a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1320ccd467d6SChris Mason if (cur_trans->list.prev != &root->fs_info->trans_list) { 1321ccd467d6SChris Mason prev_trans = list_entry(cur_trans->list.prev, 1322ccd467d6SChris Mason struct btrfs_transaction, list); 1323ccd467d6SChris Mason if (!prev_trans->commit_done) { 132413c5a93eSJosef Bacik atomic_inc(&prev_trans->use_count); 1325a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1326ccd467d6SChris Mason 1327ccd467d6SChris Mason wait_for_commit(root, prev_trans); 1328ccd467d6SChris Mason 132915ee9bc7SJosef Bacik put_transaction(prev_trans); 1330a4abeea4SJosef Bacik } else { 1331a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1332ccd467d6SChris Mason } 1333a4abeea4SJosef Bacik } else { 1334a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1335ccd467d6SChris Mason } 133615ee9bc7SJosef Bacik 133789573b9cSChris Mason if (now < cur_trans->start_time || now - cur_trans->start_time < 1) 133889573b9cSChris Mason should_grow = 1; 133989573b9cSChris Mason 134015ee9bc7SJosef Bacik do { 13417ea394f1SYan Zheng int snap_pending = 0; 1342a4abeea4SJosef Bacik 134315ee9bc7SJosef Bacik joined = cur_trans->num_joined; 13447ea394f1SYan Zheng if (!list_empty(&trans->transaction->pending_snapshots)) 13457ea394f1SYan Zheng snap_pending = 1; 13467ea394f1SYan Zheng 13472c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 134815ee9bc7SJosef Bacik 13490bdb1db2SSage Weil if (flush_on_commit || snap_pending) { 135024bbcf04SYan, Zheng btrfs_start_delalloc_inodes(root, 1); 1351143bede5SJeff Mahoney btrfs_wait_ordered_extents(root, 0, 1); 13527ea394f1SYan Zheng } 13537ea394f1SYan Zheng 135416cdcec7SMiao Xie ret = btrfs_run_delayed_items(trans, root); 135549b25e05SJeff Mahoney if (ret) 135649b25e05SJeff Mahoney goto cleanup_transaction; 135716cdcec7SMiao Xie 13585a3f23d5SChris Mason /* 13595a3f23d5SChris Mason * rename don't use btrfs_join_transaction, so, once we 13605a3f23d5SChris Mason * set the transaction to blocked above, we aren't going 13615a3f23d5SChris Mason * to get any new ordered operations. We can safely run 13625a3f23d5SChris Mason * it here and no for sure that nothing new will be added 13635a3f23d5SChris Mason * to the list 13645a3f23d5SChris Mason */ 13655a3f23d5SChris Mason btrfs_run_ordered_operations(root, 1); 13665a3f23d5SChris Mason 1367ed3b3d31SChris Mason prepare_to_wait(&cur_trans->writer_wait, &wait, 1368ed3b3d31SChris Mason TASK_UNINTERRUPTIBLE); 1369ed3b3d31SChris Mason 137013c5a93eSJosef Bacik if (atomic_read(&cur_trans->num_writers) > 1) 137199d16cbcSSage Weil schedule_timeout(MAX_SCHEDULE_TIMEOUT); 137299d16cbcSSage Weil else if (should_grow) 137399d16cbcSSage Weil schedule_timeout(1); 137415ee9bc7SJosef Bacik 137515ee9bc7SJosef Bacik finish_wait(&cur_trans->writer_wait, &wait); 1376ed0ca140SJosef Bacik } while (atomic_read(&cur_trans->num_writers) > 1 || 1377ed0ca140SJosef Bacik (should_grow && cur_trans->num_joined != joined)); 1378ed0ca140SJosef Bacik 1379ed0ca140SJosef Bacik /* 1380ed0ca140SJosef Bacik * Ok now we need to make sure to block out any other joins while we 1381ed0ca140SJosef Bacik * commit the transaction. We could have started a join before setting 1382ed0ca140SJosef Bacik * no_join so make sure to wait for num_writers to == 1 again. 1383ed0ca140SJosef Bacik */ 1384a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1385a4abeea4SJosef Bacik root->fs_info->trans_no_join = 1; 1386a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1387ed0ca140SJosef Bacik wait_event(cur_trans->writer_wait, 1388ed0ca140SJosef Bacik atomic_read(&cur_trans->num_writers) == 1); 138915ee9bc7SJosef Bacik 13907585717fSChris Mason /* 13917585717fSChris Mason * the reloc mutex makes sure that we stop 13927585717fSChris Mason * the balancing code from coming in and moving 13937585717fSChris Mason * extents around in the middle of the commit 13947585717fSChris Mason */ 13957585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 13967585717fSChris Mason 1397e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 139849b25e05SJeff Mahoney if (ret) { 139949b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 140049b25e05SJeff Mahoney goto cleanup_transaction; 140149b25e05SJeff Mahoney } 14023063d29fSChris Mason 1403e999376fSChris Mason ret = create_pending_snapshots(trans, root->fs_info); 140449b25e05SJeff Mahoney if (ret) { 140549b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 140649b25e05SJeff Mahoney goto cleanup_transaction; 140749b25e05SJeff Mahoney } 140816cdcec7SMiao Xie 140956bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 141049b25e05SJeff Mahoney if (ret) { 141149b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 141249b25e05SJeff Mahoney goto cleanup_transaction; 141349b25e05SJeff Mahoney } 141456bec294SChris Mason 1415e999376fSChris Mason /* 1416e999376fSChris Mason * make sure none of the code above managed to slip in a 1417e999376fSChris Mason * delayed item 1418e999376fSChris Mason */ 1419e999376fSChris Mason btrfs_assert_delayed_root_empty(root); 1420e999376fSChris Mason 14212c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 1422dc17ff8fSChris Mason 1423a2de733cSArne Jansen btrfs_scrub_pause(root); 1424e02119d5SChris Mason /* btrfs_commit_tree_roots is responsible for getting the 1425e02119d5SChris Mason * various roots consistent with each other. Every pointer 1426e02119d5SChris Mason * in the tree of tree roots has to point to the most up to date 1427e02119d5SChris Mason * root for every subvolume and other tree. So, we have to keep 1428e02119d5SChris Mason * the tree logging code from jumping in and changing any 1429e02119d5SChris Mason * of the trees. 1430e02119d5SChris Mason * 1431e02119d5SChris Mason * At this point in the commit, there can't be any tree-log 1432e02119d5SChris Mason * writers, but a little lower down we drop the trans mutex 1433e02119d5SChris Mason * and let new people in. By holding the tree_log_mutex 1434e02119d5SChris Mason * from now until after the super is written, we avoid races 1435e02119d5SChris Mason * with the tree-log code. 1436e02119d5SChris Mason */ 1437e02119d5SChris Mason mutex_lock(&root->fs_info->tree_log_mutex); 14381a40e23bSZheng Yan 14395d4f98a2SYan Zheng ret = commit_fs_roots(trans, root); 144049b25e05SJeff Mahoney if (ret) { 144149b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 1442871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 144349b25e05SJeff Mahoney goto cleanup_transaction; 144449b25e05SJeff Mahoney } 144554aa1f4dSChris Mason 14465d4f98a2SYan Zheng /* commit_fs_roots gets rid of all the tree log roots, it is now 1447e02119d5SChris Mason * safe to free the root of tree log roots 1448e02119d5SChris Mason */ 1449e02119d5SChris Mason btrfs_free_log_root_tree(trans, root->fs_info); 1450e02119d5SChris Mason 14515d4f98a2SYan Zheng ret = commit_cowonly_roots(trans, root); 145249b25e05SJeff Mahoney if (ret) { 145349b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 1454871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 145549b25e05SJeff Mahoney goto cleanup_transaction; 145649b25e05SJeff Mahoney } 145754aa1f4dSChris Mason 145811833d66SYan Zheng btrfs_prepare_extent_commit(trans, root); 145911833d66SYan Zheng 146078fae27eSChris Mason cur_trans = root->fs_info->running_transaction; 14615f39d397SChris Mason 14625d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->tree_root->root_item, 14635d4f98a2SYan Zheng root->fs_info->tree_root->node); 1464817d52f8SJosef Bacik switch_commit_root(root->fs_info->tree_root); 14655d4f98a2SYan Zheng 14665d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->chunk_root->root_item, 14675d4f98a2SYan Zheng root->fs_info->chunk_root->node); 1468817d52f8SJosef Bacik switch_commit_root(root->fs_info->chunk_root); 14695d4f98a2SYan Zheng 14705d4f98a2SYan Zheng update_super_roots(root); 1471e02119d5SChris Mason 1472e02119d5SChris Mason if (!root->fs_info->log_root_recovering) { 14736c41761fSDavid Sterba btrfs_set_super_log_root(root->fs_info->super_copy, 0); 14746c41761fSDavid Sterba btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); 1475e02119d5SChris Mason } 1476e02119d5SChris Mason 14776c41761fSDavid Sterba memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, 14786c41761fSDavid Sterba sizeof(*root->fs_info->super_copy)); 1479ccd467d6SChris Mason 1480f9295749SChris Mason trans->transaction->blocked = 0; 1481a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1482a4abeea4SJosef Bacik root->fs_info->running_transaction = NULL; 1483a4abeea4SJosef Bacik root->fs_info->trans_no_join = 0; 1484a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 14857585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 1486b7ec40d7SChris Mason 1487f9295749SChris Mason wake_up(&root->fs_info->transaction_wait); 1488e6dcd2dcSChris Mason 148979154b1bSChris Mason ret = btrfs_write_and_wait_transaction(trans, root); 149049b25e05SJeff Mahoney if (ret) { 149149b25e05SJeff Mahoney btrfs_error(root->fs_info, ret, 149249b25e05SJeff Mahoney "Error while writing out transaction."); 149349b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 149449b25e05SJeff Mahoney goto cleanup_transaction; 149549b25e05SJeff Mahoney } 149649b25e05SJeff Mahoney 149749b25e05SJeff Mahoney ret = write_ctree_super(trans, root, 0); 149849b25e05SJeff Mahoney if (ret) { 149949b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 150049b25e05SJeff Mahoney goto cleanup_transaction; 150149b25e05SJeff Mahoney } 15024313b399SChris Mason 1503e02119d5SChris Mason /* 1504e02119d5SChris Mason * the super is written, we can safely allow the tree-loggers 1505e02119d5SChris Mason * to go about their business 1506e02119d5SChris Mason */ 1507e02119d5SChris Mason mutex_unlock(&root->fs_info->tree_log_mutex); 1508e02119d5SChris Mason 150911833d66SYan Zheng btrfs_finish_extent_commit(trans, root); 15104313b399SChris Mason 15112c90e5d6SChris Mason cur_trans->commit_done = 1; 1512b7ec40d7SChris Mason 151315ee9bc7SJosef Bacik root->fs_info->last_trans_committed = cur_trans->transid; 1514817d52f8SJosef Bacik 15152c90e5d6SChris Mason wake_up(&cur_trans->commit_wait); 15163de4586cSChris Mason 1517a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 151813c5a93eSJosef Bacik list_del_init(&cur_trans->list); 1519a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1520a4abeea4SJosef Bacik 152179154b1bSChris Mason put_transaction(cur_trans); 152278fae27eSChris Mason put_transaction(cur_trans); 152358176a96SJosef Bacik 15241abe9b8aSliubo trace_btrfs_transaction_commit(root); 15251abe9b8aSliubo 1526a2de733cSArne Jansen btrfs_scrub_continue(root); 1527a2de733cSArne Jansen 15289ed74f2dSJosef Bacik if (current->journal_info == trans) 15299ed74f2dSJosef Bacik current->journal_info = NULL; 15309ed74f2dSJosef Bacik 15312c90e5d6SChris Mason kmem_cache_free(btrfs_trans_handle_cachep, trans); 153224bbcf04SYan, Zheng 153324bbcf04SYan, Zheng if (current != root->fs_info->transaction_kthread) 153424bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 153524bbcf04SYan, Zheng 153679154b1bSChris Mason return ret; 153749b25e05SJeff Mahoney 153849b25e05SJeff Mahoney cleanup_transaction: 153949b25e05SJeff Mahoney btrfs_printk(root->fs_info, "Skipping commit of aborted transaction.\n"); 154049b25e05SJeff Mahoney // WARN_ON(1); 154149b25e05SJeff Mahoney if (current->journal_info == trans) 154249b25e05SJeff Mahoney current->journal_info = NULL; 15437b8b92afSJosef Bacik cleanup_transaction(trans, root, ret); 154449b25e05SJeff Mahoney 154549b25e05SJeff Mahoney return ret; 154679154b1bSChris Mason } 154779154b1bSChris Mason 1548d352ac68SChris Mason /* 1549d352ac68SChris Mason * interface function to delete all the snapshots we have scheduled for deletion 1550d352ac68SChris Mason */ 1551e9d0b13bSChris Mason int btrfs_clean_old_snapshots(struct btrfs_root *root) 1552e9d0b13bSChris Mason { 15535d4f98a2SYan Zheng LIST_HEAD(list); 15545d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 1555e9d0b13bSChris Mason 1556a4abeea4SJosef Bacik spin_lock(&fs_info->trans_lock); 15575d4f98a2SYan Zheng list_splice_init(&fs_info->dead_roots, &list); 1558a4abeea4SJosef Bacik spin_unlock(&fs_info->trans_lock); 15595d4f98a2SYan Zheng 15605d4f98a2SYan Zheng while (!list_empty(&list)) { 15612c536799SJeff Mahoney int ret; 15622c536799SJeff Mahoney 15635d4f98a2SYan Zheng root = list_entry(list.next, struct btrfs_root, root_list); 156476dda93cSYan, Zheng list_del(&root->root_list); 156576dda93cSYan, Zheng 156616cdcec7SMiao Xie btrfs_kill_all_delayed_nodes(root); 156716cdcec7SMiao Xie 156876dda93cSYan, Zheng if (btrfs_header_backref_rev(root->node) < 156976dda93cSYan, Zheng BTRFS_MIXED_BACKREF_REV) 15702c536799SJeff Mahoney ret = btrfs_drop_snapshot(root, NULL, 0, 0); 157176dda93cSYan, Zheng else 15722c536799SJeff Mahoney ret =btrfs_drop_snapshot(root, NULL, 1, 0); 15732c536799SJeff Mahoney BUG_ON(ret < 0); 1574e9d0b13bSChris Mason } 1575e9d0b13bSChris Mason return 0; 1576e9d0b13bSChris Mason } 1577