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" 3179154b1bSChris Mason 320f7d52f4SChris Mason #define BTRFS_ROOT_TRANS_TAG 0 330f7d52f4SChris Mason 3449b25e05SJeff Mahoney void put_transaction(struct btrfs_transaction *transaction) 3579154b1bSChris Mason { 3613c5a93eSJosef Bacik WARN_ON(atomic_read(&transaction->use_count) == 0); 3713c5a93eSJosef Bacik if (atomic_dec_and_test(&transaction->use_count)) { 38a4abeea4SJosef Bacik BUG_ON(!list_empty(&transaction->list)); 3900f04b88SArne Jansen WARN_ON(transaction->delayed_refs.root.rb_node); 4000f04b88SArne Jansen WARN_ON(!list_empty(&transaction->delayed_refs.seq_head)); 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; 102a4abeea4SJosef Bacik } 103d43317dcSChris Mason 10413c5a93eSJosef Bacik atomic_set(&cur_trans->num_writers, 1); 10515ee9bc7SJosef Bacik cur_trans->num_joined = 0; 10679154b1bSChris Mason init_waitqueue_head(&cur_trans->writer_wait); 10779154b1bSChris Mason init_waitqueue_head(&cur_trans->commit_wait); 10879154b1bSChris Mason cur_trans->in_commit = 0; 109f9295749SChris Mason cur_trans->blocked = 0; 110a4abeea4SJosef Bacik /* 111a4abeea4SJosef Bacik * One for this trans handle, one so it will live on until we 112a4abeea4SJosef Bacik * commit the transaction. 113a4abeea4SJosef Bacik */ 114a4abeea4SJosef Bacik atomic_set(&cur_trans->use_count, 2); 11579154b1bSChris Mason cur_trans->commit_done = 0; 11608607c1bSChris Mason cur_trans->start_time = get_seconds(); 11756bec294SChris Mason 1186bef4d31SEric Paris cur_trans->delayed_refs.root = RB_ROOT; 11956bec294SChris Mason cur_trans->delayed_refs.num_entries = 0; 120c3e69d58SChris Mason cur_trans->delayed_refs.num_heads_ready = 0; 121c3e69d58SChris Mason cur_trans->delayed_refs.num_heads = 0; 12256bec294SChris Mason cur_trans->delayed_refs.flushing = 0; 123c3e69d58SChris Mason cur_trans->delayed_refs.run_delayed_start = 0; 12400f04b88SArne Jansen cur_trans->delayed_refs.seq = 1; 12520b297d6SJan Schmidt 12620b297d6SJan Schmidt /* 12720b297d6SJan Schmidt * although the tree mod log is per file system and not per transaction, 12820b297d6SJan Schmidt * the log must never go across transaction boundaries. 12920b297d6SJan Schmidt */ 13020b297d6SJan Schmidt smp_mb(); 13120b297d6SJan Schmidt if (!list_empty(&fs_info->tree_mod_seq_list)) { 13220b297d6SJan Schmidt printk(KERN_ERR "btrfs: tree_mod_seq_list not empty when " 13320b297d6SJan Schmidt "creating a fresh transaction\n"); 13420b297d6SJan Schmidt WARN_ON(1); 13520b297d6SJan Schmidt } 13620b297d6SJan Schmidt if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) { 13720b297d6SJan Schmidt printk(KERN_ERR "btrfs: tree_mod_log rb tree not empty when " 13820b297d6SJan Schmidt "creating a fresh transaction\n"); 13920b297d6SJan Schmidt WARN_ON(1); 14020b297d6SJan Schmidt } 14120b297d6SJan Schmidt atomic_set(&fs_info->tree_mod_seq, 0); 14220b297d6SJan Schmidt 143a168650cSJan Schmidt init_waitqueue_head(&cur_trans->delayed_refs.seq_wait); 144a4abeea4SJosef Bacik spin_lock_init(&cur_trans->commit_lock); 14556bec294SChris Mason spin_lock_init(&cur_trans->delayed_refs.lock); 14600f04b88SArne Jansen INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head); 14756bec294SChris Mason 1483063d29fSChris Mason INIT_LIST_HEAD(&cur_trans->pending_snapshots); 14919ae4e81SJan Schmidt list_add_tail(&cur_trans->list, &fs_info->trans_list); 150d1310b2eSChris Mason extent_io_tree_init(&cur_trans->dirty_pages, 15119ae4e81SJan Schmidt fs_info->btree_inode->i_mapping); 15219ae4e81SJan Schmidt fs_info->generation++; 15319ae4e81SJan Schmidt cur_trans->transid = fs_info->generation; 15419ae4e81SJan Schmidt fs_info->running_transaction = cur_trans; 15549b25e05SJeff Mahoney cur_trans->aborted = 0; 15619ae4e81SJan Schmidt spin_unlock(&fs_info->trans_lock); 15715ee9bc7SJosef Bacik 15879154b1bSChris Mason return 0; 15979154b1bSChris Mason } 16079154b1bSChris Mason 161d352ac68SChris Mason /* 162d397712bSChris Mason * this does all the record keeping required to make sure that a reference 163d397712bSChris Mason * counted root is properly recorded in a given transaction. This is required 164d397712bSChris Mason * to make sure the old root from before we joined the transaction is deleted 165d397712bSChris Mason * when the transaction commits 166d352ac68SChris Mason */ 1677585717fSChris Mason static int record_root_in_trans(struct btrfs_trans_handle *trans, 1685d4f98a2SYan Zheng struct btrfs_root *root) 1696702ed49SChris Mason { 1705d4f98a2SYan Zheng if (root->ref_cows && root->last_trans < trans->transid) { 1716702ed49SChris Mason WARN_ON(root == root->fs_info->extent_root); 1725d4f98a2SYan Zheng WARN_ON(root->commit_root != root->node); 1735d4f98a2SYan Zheng 1747585717fSChris Mason /* 1757585717fSChris Mason * see below for in_trans_setup usage rules 1767585717fSChris Mason * we have the reloc mutex held now, so there 1777585717fSChris Mason * is only one writer in this function 1787585717fSChris Mason */ 1797585717fSChris Mason root->in_trans_setup = 1; 1807585717fSChris Mason 1817585717fSChris Mason /* make sure readers find in_trans_setup before 1827585717fSChris Mason * they find our root->last_trans update 1837585717fSChris Mason */ 1847585717fSChris Mason smp_wmb(); 1857585717fSChris Mason 186a4abeea4SJosef Bacik spin_lock(&root->fs_info->fs_roots_radix_lock); 187a4abeea4SJosef Bacik if (root->last_trans == trans->transid) { 188a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 189a4abeea4SJosef Bacik return 0; 190a4abeea4SJosef Bacik } 1916702ed49SChris Mason radix_tree_tag_set(&root->fs_info->fs_roots_radix, 1926702ed49SChris Mason (unsigned long)root->root_key.objectid, 1936702ed49SChris Mason BTRFS_ROOT_TRANS_TAG); 194a4abeea4SJosef Bacik spin_unlock(&root->fs_info->fs_roots_radix_lock); 1957585717fSChris Mason root->last_trans = trans->transid; 1967585717fSChris Mason 1977585717fSChris Mason /* this is pretty tricky. We don't want to 1987585717fSChris Mason * take the relocation lock in btrfs_record_root_in_trans 1997585717fSChris Mason * unless we're really doing the first setup for this root in 2007585717fSChris Mason * this transaction. 2017585717fSChris Mason * 2027585717fSChris Mason * Normally we'd use root->last_trans as a flag to decide 2037585717fSChris Mason * if we want to take the expensive mutex. 2047585717fSChris Mason * 2057585717fSChris Mason * But, we have to set root->last_trans before we 2067585717fSChris Mason * init the relocation root, otherwise, we trip over warnings 2077585717fSChris Mason * in ctree.c. The solution used here is to flag ourselves 2087585717fSChris Mason * with root->in_trans_setup. When this is 1, we're still 2097585717fSChris Mason * fixing up the reloc trees and everyone must wait. 2107585717fSChris Mason * 2117585717fSChris Mason * When this is zero, they can trust root->last_trans and fly 2127585717fSChris Mason * through btrfs_record_root_in_trans without having to take the 2137585717fSChris Mason * lock. smp_wmb() makes sure that all the writes above are 2147585717fSChris Mason * done before we pop in the zero below 2157585717fSChris Mason */ 2165d4f98a2SYan Zheng btrfs_init_reloc_root(trans, root); 2177585717fSChris Mason smp_wmb(); 2187585717fSChris Mason root->in_trans_setup = 0; 2196702ed49SChris Mason } 2205d4f98a2SYan Zheng return 0; 2216702ed49SChris Mason } 2225d4f98a2SYan Zheng 2237585717fSChris Mason 2247585717fSChris Mason int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 2257585717fSChris Mason struct btrfs_root *root) 2267585717fSChris Mason { 2277585717fSChris Mason if (!root->ref_cows) 2287585717fSChris Mason return 0; 2297585717fSChris Mason 2307585717fSChris Mason /* 2317585717fSChris Mason * see record_root_in_trans for comments about in_trans_setup usage 2327585717fSChris Mason * and barriers 2337585717fSChris Mason */ 2347585717fSChris Mason smp_rmb(); 2357585717fSChris Mason if (root->last_trans == trans->transid && 2367585717fSChris Mason !root->in_trans_setup) 2377585717fSChris Mason return 0; 2387585717fSChris Mason 2397585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 2407585717fSChris Mason record_root_in_trans(trans, root); 2417585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 2427585717fSChris Mason 2437585717fSChris Mason return 0; 2447585717fSChris Mason } 2457585717fSChris Mason 246d352ac68SChris Mason /* wait for commit against the current transaction to become unblocked 247d352ac68SChris Mason * when this is done, it is safe to start a new transaction, but the current 248d352ac68SChris Mason * transaction might not be fully on disk. 249d352ac68SChris Mason */ 25037d1aeeeSChris Mason static void wait_current_trans(struct btrfs_root *root) 25179154b1bSChris Mason { 252f9295749SChris Mason struct btrfs_transaction *cur_trans; 25379154b1bSChris Mason 254a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 255f9295749SChris Mason cur_trans = root->fs_info->running_transaction; 25637d1aeeeSChris Mason if (cur_trans && cur_trans->blocked) { 25713c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 258a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 25972d63ed6SLi Zefan 26072d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 26172d63ed6SLi Zefan !cur_trans->blocked); 262f9295749SChris Mason put_transaction(cur_trans); 263a4abeea4SJosef Bacik } else { 264a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 265f9295749SChris Mason } 26637d1aeeeSChris Mason } 26737d1aeeeSChris Mason 268249ac1e5SJosef Bacik enum btrfs_trans_type { 269249ac1e5SJosef Bacik TRANS_START, 270249ac1e5SJosef Bacik TRANS_JOIN, 271249ac1e5SJosef Bacik TRANS_USERSPACE, 2720af3d00bSJosef Bacik TRANS_JOIN_NOLOCK, 273249ac1e5SJosef Bacik }; 274249ac1e5SJosef Bacik 275a22285a6SYan, Zheng static int may_wait_transaction(struct btrfs_root *root, int type) 27637d1aeeeSChris Mason { 277a4abeea4SJosef Bacik if (root->fs_info->log_root_recovering) 278a4abeea4SJosef Bacik return 0; 279a4abeea4SJosef Bacik 280a4abeea4SJosef Bacik if (type == TRANS_USERSPACE) 281a22285a6SYan, Zheng return 1; 282a4abeea4SJosef Bacik 283a4abeea4SJosef Bacik if (type == TRANS_START && 284a4abeea4SJosef Bacik !atomic_read(&root->fs_info->open_ioctl_trans)) 285a4abeea4SJosef Bacik return 1; 286a4abeea4SJosef Bacik 287a22285a6SYan, Zheng return 0; 288a22285a6SYan, Zheng } 289a22285a6SYan, Zheng 290a22285a6SYan, Zheng static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, 291a22285a6SYan, Zheng u64 num_items, int type) 292a22285a6SYan, Zheng { 293a22285a6SYan, Zheng struct btrfs_trans_handle *h; 294a22285a6SYan, Zheng struct btrfs_transaction *cur_trans; 295b5009945SJosef Bacik u64 num_bytes = 0; 296a22285a6SYan, Zheng int ret; 297acce952bSliubo 298acce952bSliubo if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) 299acce952bSliubo return ERR_PTR(-EROFS); 3002a1eb461SJosef Bacik 3012a1eb461SJosef Bacik if (current->journal_info) { 3022a1eb461SJosef Bacik WARN_ON(type != TRANS_JOIN && type != TRANS_JOIN_NOLOCK); 3032a1eb461SJosef Bacik h = current->journal_info; 3042a1eb461SJosef Bacik h->use_count++; 3052a1eb461SJosef Bacik h->orig_rsv = h->block_rsv; 3062a1eb461SJosef Bacik h->block_rsv = NULL; 3072a1eb461SJosef Bacik goto got_it; 3082a1eb461SJosef Bacik } 309b5009945SJosef Bacik 310b5009945SJosef Bacik /* 311b5009945SJosef Bacik * Do the reservation before we join the transaction so we can do all 312b5009945SJosef Bacik * the appropriate flushing if need be. 313b5009945SJosef Bacik */ 314b5009945SJosef Bacik if (num_items > 0 && root != root->fs_info->chunk_root) { 315b5009945SJosef Bacik num_bytes = btrfs_calc_trans_metadata_size(root, num_items); 3164a92b1b8SJosef Bacik ret = btrfs_block_rsv_add(root, 317b5009945SJosef Bacik &root->fs_info->trans_block_rsv, 318b5009945SJosef Bacik num_bytes); 319b5009945SJosef Bacik if (ret) 320b5009945SJosef Bacik return ERR_PTR(ret); 321b5009945SJosef Bacik } 322a22285a6SYan, Zheng again: 323a22285a6SYan, Zheng h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); 324a22285a6SYan, Zheng if (!h) 325a22285a6SYan, Zheng return ERR_PTR(-ENOMEM); 326a22285a6SYan, Zheng 327a22285a6SYan, Zheng if (may_wait_transaction(root, type)) 32837d1aeeeSChris Mason wait_current_trans(root); 329a22285a6SYan, Zheng 330a4abeea4SJosef Bacik do { 331a4abeea4SJosef Bacik ret = join_transaction(root, type == TRANS_JOIN_NOLOCK); 332a4abeea4SJosef Bacik if (ret == -EBUSY) 333a4abeea4SJosef Bacik wait_current_trans(root); 334a4abeea4SJosef Bacik } while (ret == -EBUSY); 335a4abeea4SJosef Bacik 336db5b493aSTsutomu Itoh if (ret < 0) { 3376e8df2aeSYoshinori Sano kmem_cache_free(btrfs_trans_handle_cachep, h); 338db5b493aSTsutomu Itoh return ERR_PTR(ret); 339db5b493aSTsutomu Itoh } 3400f7d52f4SChris Mason 341a22285a6SYan, Zheng cur_trans = root->fs_info->running_transaction; 342a22285a6SYan, Zheng 343a22285a6SYan, Zheng h->transid = cur_trans->transid; 344a22285a6SYan, Zheng h->transaction = cur_trans; 34579154b1bSChris Mason h->blocks_used = 0; 346a22285a6SYan, Zheng h->bytes_reserved = 0; 34756bec294SChris Mason h->delayed_ref_updates = 0; 3482a1eb461SJosef Bacik h->use_count = 1; 349f0486c68SYan, Zheng h->block_rsv = NULL; 3502a1eb461SJosef Bacik h->orig_rsv = NULL; 35149b25e05SJeff Mahoney h->aborted = 0; 352b7ec40d7SChris Mason 353a22285a6SYan, Zheng smp_mb(); 354a22285a6SYan, Zheng if (cur_trans->blocked && may_wait_transaction(root, type)) { 355a22285a6SYan, Zheng btrfs_commit_transaction(h, root); 356a22285a6SYan, Zheng goto again; 357a22285a6SYan, Zheng } 3589ed74f2dSJosef Bacik 359b5009945SJosef Bacik if (num_bytes) { 3608c2a3ca2SJosef Bacik trace_btrfs_space_reservation(root->fs_info, "transaction", 3612bcc0328SLiu Bo h->transid, num_bytes, 1); 362b5009945SJosef Bacik h->block_rsv = &root->fs_info->trans_block_rsv; 363b5009945SJosef Bacik h->bytes_reserved = num_bytes; 364a22285a6SYan, Zheng } 365a22285a6SYan, Zheng 3662a1eb461SJosef Bacik got_it: 367a4abeea4SJosef Bacik btrfs_record_root_in_trans(h, root); 368a22285a6SYan, Zheng 369a22285a6SYan, Zheng if (!current->journal_info && type != TRANS_USERSPACE) 370a22285a6SYan, Zheng current->journal_info = h; 37179154b1bSChris Mason return h; 37279154b1bSChris Mason } 37379154b1bSChris Mason 374f9295749SChris Mason struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 375a22285a6SYan, Zheng int num_items) 376f9295749SChris Mason { 377a22285a6SYan, Zheng return start_transaction(root, num_items, TRANS_START); 378f9295749SChris Mason } 3797a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) 380f9295749SChris Mason { 381a22285a6SYan, Zheng return start_transaction(root, 0, TRANS_JOIN); 382f9295749SChris Mason } 383f9295749SChris Mason 3847a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) 3850af3d00bSJosef Bacik { 3860af3d00bSJosef Bacik return start_transaction(root, 0, TRANS_JOIN_NOLOCK); 3870af3d00bSJosef Bacik } 3880af3d00bSJosef Bacik 3897a7eaa40SJosef Bacik struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) 3909ca9ee09SSage Weil { 3917a7eaa40SJosef Bacik return start_transaction(root, 0, TRANS_USERSPACE); 3929ca9ee09SSage Weil } 3939ca9ee09SSage Weil 394d352ac68SChris Mason /* wait for a transaction commit to be fully complete */ 395b9c8300cSLi Zefan static noinline void wait_for_commit(struct btrfs_root *root, 39689ce8a63SChris Mason struct btrfs_transaction *commit) 39789ce8a63SChris Mason { 39872d63ed6SLi Zefan wait_event(commit->commit_wait, commit->commit_done); 39989ce8a63SChris Mason } 40089ce8a63SChris Mason 40146204592SSage Weil int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) 40246204592SSage Weil { 40346204592SSage Weil struct btrfs_transaction *cur_trans = NULL, *t; 40446204592SSage Weil int ret; 40546204592SSage Weil 40646204592SSage Weil ret = 0; 40746204592SSage Weil if (transid) { 40846204592SSage Weil if (transid <= root->fs_info->last_trans_committed) 409a4abeea4SJosef Bacik goto out; 41046204592SSage Weil 41146204592SSage Weil /* find specified transaction */ 412a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 41346204592SSage Weil list_for_each_entry(t, &root->fs_info->trans_list, list) { 41446204592SSage Weil if (t->transid == transid) { 41546204592SSage Weil cur_trans = t; 416a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 41746204592SSage Weil break; 41846204592SSage Weil } 41946204592SSage Weil if (t->transid > transid) 42046204592SSage Weil break; 42146204592SSage Weil } 422a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 42346204592SSage Weil ret = -EINVAL; 42446204592SSage Weil if (!cur_trans) 425a4abeea4SJosef Bacik goto out; /* bad transid */ 42646204592SSage Weil } else { 42746204592SSage Weil /* find newest transaction that is committing | committed */ 428a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 42946204592SSage Weil list_for_each_entry_reverse(t, &root->fs_info->trans_list, 43046204592SSage Weil list) { 43146204592SSage Weil if (t->in_commit) { 43246204592SSage Weil if (t->commit_done) 4333473f3c0SJosef Bacik break; 43446204592SSage Weil cur_trans = t; 435a4abeea4SJosef Bacik atomic_inc(&cur_trans->use_count); 43646204592SSage Weil break; 43746204592SSage Weil } 43846204592SSage Weil } 439a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 44046204592SSage Weil if (!cur_trans) 441a4abeea4SJosef Bacik goto out; /* nothing committing|committed */ 44246204592SSage Weil } 44346204592SSage Weil 44446204592SSage Weil wait_for_commit(root, cur_trans); 44546204592SSage Weil 44646204592SSage Weil put_transaction(cur_trans); 44746204592SSage Weil ret = 0; 448a4abeea4SJosef Bacik out: 44946204592SSage Weil return ret; 45046204592SSage Weil } 45146204592SSage Weil 45237d1aeeeSChris Mason void btrfs_throttle(struct btrfs_root *root) 45337d1aeeeSChris Mason { 454a4abeea4SJosef Bacik if (!atomic_read(&root->fs_info->open_ioctl_trans)) 45537d1aeeeSChris Mason wait_current_trans(root); 45637d1aeeeSChris Mason } 45737d1aeeeSChris Mason 4588929ecfaSYan, Zheng static int should_end_transaction(struct btrfs_trans_handle *trans, 4598929ecfaSYan, Zheng struct btrfs_root *root) 4608929ecfaSYan, Zheng { 4618929ecfaSYan, Zheng int ret; 46236ba022aSJosef Bacik 46336ba022aSJosef Bacik ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); 4648929ecfaSYan, Zheng return ret ? 1 : 0; 4658929ecfaSYan, Zheng } 4668929ecfaSYan, Zheng 4678929ecfaSYan, Zheng int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 4688929ecfaSYan, Zheng struct btrfs_root *root) 4698929ecfaSYan, Zheng { 4708929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 4719c8d86dbSJosef Bacik struct btrfs_block_rsv *rsv = trans->block_rsv; 4728929ecfaSYan, Zheng int updates; 47349b25e05SJeff Mahoney int err; 4748929ecfaSYan, Zheng 475a4abeea4SJosef Bacik smp_mb(); 4768929ecfaSYan, Zheng if (cur_trans->blocked || cur_trans->delayed_refs.flushing) 4778929ecfaSYan, Zheng return 1; 4788929ecfaSYan, Zheng 4799c8d86dbSJosef Bacik /* 4809c8d86dbSJosef Bacik * We need to do this in case we're deleting csums so the global block 4819c8d86dbSJosef Bacik * rsv get's used instead of the csum block rsv. 4829c8d86dbSJosef Bacik */ 4839c8d86dbSJosef Bacik trans->block_rsv = NULL; 4849c8d86dbSJosef Bacik 4858929ecfaSYan, Zheng updates = trans->delayed_ref_updates; 4868929ecfaSYan, Zheng trans->delayed_ref_updates = 0; 48749b25e05SJeff Mahoney if (updates) { 48849b25e05SJeff Mahoney err = btrfs_run_delayed_refs(trans, root, updates); 48949b25e05SJeff Mahoney if (err) /* Error code will also eval true */ 49049b25e05SJeff Mahoney return err; 49149b25e05SJeff Mahoney } 4928929ecfaSYan, Zheng 4939c8d86dbSJosef Bacik trans->block_rsv = rsv; 4949c8d86dbSJosef Bacik 4958929ecfaSYan, Zheng return should_end_transaction(trans, root); 4968929ecfaSYan, Zheng } 4978929ecfaSYan, Zheng 49889ce8a63SChris Mason static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, 4990af3d00bSJosef Bacik struct btrfs_root *root, int throttle, int lock) 50079154b1bSChris Mason { 5018929ecfaSYan, Zheng struct btrfs_transaction *cur_trans = trans->transaction; 502ab78c84dSChris Mason struct btrfs_fs_info *info = root->fs_info; 503c3e69d58SChris Mason int count = 0; 5044edc2ca3SDave Jones int err = 0; 505d6e4a428SChris Mason 5062a1eb461SJosef Bacik if (--trans->use_count) { 5072a1eb461SJosef Bacik trans->block_rsv = trans->orig_rsv; 5082a1eb461SJosef Bacik return 0; 5092a1eb461SJosef Bacik } 5102a1eb461SJosef Bacik 511b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 5124c13d758SJosef Bacik trans->block_rsv = NULL; 513203bf287SChris Mason while (count < 2) { 514c3e69d58SChris Mason unsigned long cur = trans->delayed_ref_updates; 515c3e69d58SChris Mason trans->delayed_ref_updates = 0; 516c3e69d58SChris Mason if (cur && 517c3e69d58SChris Mason trans->transaction->delayed_refs.num_heads_ready > 64) { 518c3e69d58SChris Mason trans->delayed_ref_updates = 0; 519c3e69d58SChris Mason btrfs_run_delayed_refs(trans, root, cur); 520c3e69d58SChris Mason } else { 521c3e69d58SChris Mason break; 522c3e69d58SChris Mason } 523c3e69d58SChris Mason count++; 52456bec294SChris Mason } 52556bec294SChris Mason 526a4abeea4SJosef Bacik if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && 527a4abeea4SJosef Bacik should_end_transaction(trans, root)) { 5288929ecfaSYan, Zheng trans->transaction->blocked = 1; 529a4abeea4SJosef Bacik smp_wmb(); 530a4abeea4SJosef Bacik } 5318929ecfaSYan, Zheng 5320af3d00bSJosef Bacik if (lock && cur_trans->blocked && !cur_trans->in_commit) { 53381317fdeSJosef Bacik if (throttle) { 53481317fdeSJosef Bacik /* 53581317fdeSJosef Bacik * We may race with somebody else here so end up having 53681317fdeSJosef Bacik * to call end_transaction on ourselves again, so inc 53781317fdeSJosef Bacik * our use_count. 53881317fdeSJosef Bacik */ 53981317fdeSJosef Bacik trans->use_count++; 5408929ecfaSYan, Zheng return btrfs_commit_transaction(trans, root); 54181317fdeSJosef Bacik } else { 5428929ecfaSYan, Zheng wake_up_process(info->transaction_kthread); 5438929ecfaSYan, Zheng } 54481317fdeSJosef Bacik } 5458929ecfaSYan, Zheng 5468929ecfaSYan, Zheng WARN_ON(cur_trans != info->running_transaction); 54713c5a93eSJosef Bacik WARN_ON(atomic_read(&cur_trans->num_writers) < 1); 54813c5a93eSJosef Bacik atomic_dec(&cur_trans->num_writers); 54989ce8a63SChris Mason 55099d16cbcSSage Weil smp_mb(); 55179154b1bSChris Mason if (waitqueue_active(&cur_trans->writer_wait)) 55279154b1bSChris Mason wake_up(&cur_trans->writer_wait); 55379154b1bSChris Mason put_transaction(cur_trans); 5549ed74f2dSJosef Bacik 5559ed74f2dSJosef Bacik if (current->journal_info == trans) 5569ed74f2dSJosef Bacik current->journal_info = NULL; 557ab78c84dSChris Mason 55824bbcf04SYan, Zheng if (throttle) 55924bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 56024bbcf04SYan, Zheng 56149b25e05SJeff Mahoney if (trans->aborted || 56249b25e05SJeff Mahoney root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 5634edc2ca3SDave Jones err = -EIO; 56449b25e05SJeff Mahoney } 56549b25e05SJeff Mahoney 5664edc2ca3SDave Jones memset(trans, 0, sizeof(*trans)); 5674edc2ca3SDave Jones kmem_cache_free(btrfs_trans_handle_cachep, trans); 5684edc2ca3SDave Jones return err; 56979154b1bSChris Mason } 57079154b1bSChris Mason 57189ce8a63SChris Mason int btrfs_end_transaction(struct btrfs_trans_handle *trans, 57289ce8a63SChris Mason struct btrfs_root *root) 57389ce8a63SChris Mason { 57416cdcec7SMiao Xie int ret; 57516cdcec7SMiao Xie 57616cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 0, 1); 57716cdcec7SMiao Xie if (ret) 57816cdcec7SMiao Xie return ret; 57916cdcec7SMiao Xie return 0; 58089ce8a63SChris Mason } 58189ce8a63SChris Mason 58289ce8a63SChris Mason int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 58389ce8a63SChris Mason struct btrfs_root *root) 58489ce8a63SChris Mason { 58516cdcec7SMiao Xie int ret; 58616cdcec7SMiao Xie 58716cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 1, 1); 58816cdcec7SMiao Xie if (ret) 58916cdcec7SMiao Xie return ret; 59016cdcec7SMiao Xie return 0; 5910af3d00bSJosef Bacik } 5920af3d00bSJosef Bacik 5930af3d00bSJosef Bacik int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, 5940af3d00bSJosef Bacik struct btrfs_root *root) 5950af3d00bSJosef Bacik { 59616cdcec7SMiao Xie int ret; 59716cdcec7SMiao Xie 59816cdcec7SMiao Xie ret = __btrfs_end_transaction(trans, root, 0, 0); 59916cdcec7SMiao Xie if (ret) 60016cdcec7SMiao Xie return ret; 60116cdcec7SMiao Xie return 0; 60216cdcec7SMiao Xie } 60316cdcec7SMiao Xie 60416cdcec7SMiao Xie int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans, 60516cdcec7SMiao Xie struct btrfs_root *root) 60616cdcec7SMiao Xie { 60716cdcec7SMiao Xie return __btrfs_end_transaction(trans, root, 1, 1); 60889ce8a63SChris Mason } 60989ce8a63SChris Mason 610d352ac68SChris Mason /* 611d352ac68SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 612d352ac68SChris Mason * them in one of two extent_io trees. This is used to make sure all of 613690587d1SChris Mason * those extents are sent to disk but does not wait on them 614d352ac68SChris Mason */ 615690587d1SChris Mason int btrfs_write_marked_extents(struct btrfs_root *root, 6168cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 61779154b1bSChris Mason { 618777e6bd7SChris Mason int err = 0; 6197c4452b9SChris Mason int werr = 0; 6201728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 621777e6bd7SChris Mason u64 start = 0; 6225f39d397SChris Mason u64 end; 6237c4452b9SChris Mason 6241728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 6251728366eSJosef Bacik mark)) { 6261728366eSJosef Bacik convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, mark, 6271728366eSJosef Bacik GFP_NOFS); 6281728366eSJosef Bacik err = filemap_fdatawrite_range(mapping, start, end); 6297c4452b9SChris Mason if (err) 6307c4452b9SChris Mason werr = err; 6311728366eSJosef Bacik cond_resched(); 6321728366eSJosef Bacik start = end + 1; 6337c4452b9SChris Mason } 634690587d1SChris Mason if (err) 635690587d1SChris Mason werr = err; 636690587d1SChris Mason return werr; 637690587d1SChris Mason } 638690587d1SChris Mason 639690587d1SChris Mason /* 640690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 641690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 642690587d1SChris Mason * those extents are on disk for transaction or log commit. We wait 643690587d1SChris Mason * on all the pages and clear them from the dirty pages state tree 644690587d1SChris Mason */ 645690587d1SChris Mason int btrfs_wait_marked_extents(struct btrfs_root *root, 6468cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 647690587d1SChris Mason { 648690587d1SChris Mason int err = 0; 649690587d1SChris Mason int werr = 0; 6501728366eSJosef Bacik struct address_space *mapping = root->fs_info->btree_inode->i_mapping; 651690587d1SChris Mason u64 start = 0; 652690587d1SChris Mason u64 end; 653690587d1SChris Mason 6541728366eSJosef Bacik while (!find_first_extent_bit(dirty_pages, start, &start, &end, 6551728366eSJosef Bacik EXTENT_NEED_WAIT)) { 6561728366eSJosef Bacik clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS); 6571728366eSJosef Bacik err = filemap_fdatawait_range(mapping, start, end); 658777e6bd7SChris Mason if (err) 659777e6bd7SChris Mason werr = err; 660777e6bd7SChris Mason cond_resched(); 6611728366eSJosef Bacik start = end + 1; 662777e6bd7SChris Mason } 6637c4452b9SChris Mason if (err) 6647c4452b9SChris Mason werr = err; 6657c4452b9SChris Mason return werr; 66679154b1bSChris Mason } 66779154b1bSChris Mason 668690587d1SChris Mason /* 669690587d1SChris Mason * when btree blocks are allocated, they have some corresponding bits set for 670690587d1SChris Mason * them in one of two extent_io trees. This is used to make sure all of 671690587d1SChris Mason * those extents are on disk for transaction or log commit 672690587d1SChris Mason */ 673690587d1SChris Mason int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, 6748cef4e16SYan, Zheng struct extent_io_tree *dirty_pages, int mark) 675690587d1SChris Mason { 676690587d1SChris Mason int ret; 677690587d1SChris Mason int ret2; 678690587d1SChris Mason 6798cef4e16SYan, Zheng ret = btrfs_write_marked_extents(root, dirty_pages, mark); 6808cef4e16SYan, Zheng ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); 681bf0da8c1SChris Mason 682bf0da8c1SChris Mason if (ret) 683bf0da8c1SChris Mason return ret; 684bf0da8c1SChris Mason if (ret2) 685bf0da8c1SChris Mason return ret2; 686bf0da8c1SChris Mason return 0; 687690587d1SChris Mason } 688690587d1SChris Mason 689d0c803c4SChris Mason int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, 690d0c803c4SChris Mason struct btrfs_root *root) 691d0c803c4SChris Mason { 692d0c803c4SChris Mason if (!trans || !trans->transaction) { 693d0c803c4SChris Mason struct inode *btree_inode; 694d0c803c4SChris Mason btree_inode = root->fs_info->btree_inode; 695d0c803c4SChris Mason return filemap_write_and_wait(btree_inode->i_mapping); 696d0c803c4SChris Mason } 697d0c803c4SChris Mason return btrfs_write_and_wait_marked_extents(root, 6988cef4e16SYan, Zheng &trans->transaction->dirty_pages, 6998cef4e16SYan, Zheng EXTENT_DIRTY); 700d0c803c4SChris Mason } 701d0c803c4SChris Mason 702d352ac68SChris Mason /* 703d352ac68SChris Mason * this is used to update the root pointer in the tree of tree roots. 704d352ac68SChris Mason * 705d352ac68SChris Mason * But, in the case of the extent allocation tree, updating the root 706d352ac68SChris Mason * pointer may allocate blocks which may change the root of the extent 707d352ac68SChris Mason * allocation tree. 708d352ac68SChris Mason * 709d352ac68SChris Mason * So, this loops and repeats and makes sure the cowonly root didn't 710d352ac68SChris Mason * change while the root pointer was being updated in the metadata. 711d352ac68SChris Mason */ 7120b86a832SChris Mason static int update_cowonly_root(struct btrfs_trans_handle *trans, 71379154b1bSChris Mason struct btrfs_root *root) 71479154b1bSChris Mason { 71579154b1bSChris Mason int ret; 7160b86a832SChris Mason u64 old_root_bytenr; 71786b9f2ecSYan, Zheng u64 old_root_used; 7180b86a832SChris Mason struct btrfs_root *tree_root = root->fs_info->tree_root; 71979154b1bSChris Mason 72086b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 7210b86a832SChris Mason btrfs_write_dirty_block_groups(trans, root); 72256bec294SChris Mason 72379154b1bSChris Mason while (1) { 7240b86a832SChris Mason old_root_bytenr = btrfs_root_bytenr(&root->root_item); 72586b9f2ecSYan, Zheng if (old_root_bytenr == root->node->start && 72686b9f2ecSYan, Zheng old_root_used == btrfs_root_used(&root->root_item)) 72779154b1bSChris Mason break; 72887ef2bb4SChris Mason 7295d4f98a2SYan Zheng btrfs_set_root_node(&root->root_item, root->node); 73079154b1bSChris Mason ret = btrfs_update_root(trans, tree_root, 7310b86a832SChris Mason &root->root_key, 7320b86a832SChris Mason &root->root_item); 73349b25e05SJeff Mahoney if (ret) 73449b25e05SJeff Mahoney return ret; 73556bec294SChris Mason 73686b9f2ecSYan, Zheng old_root_used = btrfs_root_used(&root->root_item); 7374a8c9a62SYan Zheng ret = btrfs_write_dirty_block_groups(trans, root); 73849b25e05SJeff Mahoney if (ret) 73949b25e05SJeff Mahoney return ret; 7400b86a832SChris Mason } 741276e680dSYan Zheng 742276e680dSYan Zheng if (root != root->fs_info->extent_root) 743817d52f8SJosef Bacik switch_commit_root(root); 744276e680dSYan Zheng 7450b86a832SChris Mason return 0; 7460b86a832SChris Mason } 7470b86a832SChris Mason 748d352ac68SChris Mason /* 749d352ac68SChris Mason * update all the cowonly tree roots on disk 75049b25e05SJeff Mahoney * 75149b25e05SJeff Mahoney * The error handling in this function may not be obvious. Any of the 75249b25e05SJeff Mahoney * failures will cause the file system to go offline. We still need 75349b25e05SJeff Mahoney * to clean up the delayed refs. 754d352ac68SChris Mason */ 7555d4f98a2SYan Zheng static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, 7560b86a832SChris Mason struct btrfs_root *root) 7570b86a832SChris Mason { 7580b86a832SChris Mason struct btrfs_fs_info *fs_info = root->fs_info; 7590b86a832SChris Mason struct list_head *next; 76084234f3aSYan Zheng struct extent_buffer *eb; 76156bec294SChris Mason int ret; 76284234f3aSYan Zheng 76356bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 76449b25e05SJeff Mahoney if (ret) 76549b25e05SJeff Mahoney return ret; 76687ef2bb4SChris Mason 76784234f3aSYan Zheng eb = btrfs_lock_root_node(fs_info->tree_root); 76849b25e05SJeff Mahoney ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 76949b25e05SJeff Mahoney 0, &eb); 77084234f3aSYan Zheng btrfs_tree_unlock(eb); 77184234f3aSYan Zheng free_extent_buffer(eb); 7720b86a832SChris Mason 77349b25e05SJeff Mahoney if (ret) 77449b25e05SJeff Mahoney return ret; 77549b25e05SJeff Mahoney 77656bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 77749b25e05SJeff Mahoney if (ret) 77849b25e05SJeff Mahoney return ret; 77987ef2bb4SChris Mason 7800b86a832SChris Mason while (!list_empty(&fs_info->dirty_cowonly_roots)) { 7810b86a832SChris Mason next = fs_info->dirty_cowonly_roots.next; 7820b86a832SChris Mason list_del_init(next); 7830b86a832SChris Mason root = list_entry(next, struct btrfs_root, dirty_list); 78487ef2bb4SChris Mason 78549b25e05SJeff Mahoney ret = update_cowonly_root(trans, root); 78649b25e05SJeff Mahoney if (ret) 78749b25e05SJeff Mahoney return ret; 78879154b1bSChris Mason } 789276e680dSYan Zheng 790276e680dSYan Zheng down_write(&fs_info->extent_commit_sem); 791276e680dSYan Zheng switch_commit_root(fs_info->extent_root); 792276e680dSYan Zheng up_write(&fs_info->extent_commit_sem); 793276e680dSYan Zheng 79479154b1bSChris Mason return 0; 79579154b1bSChris Mason } 79679154b1bSChris Mason 797d352ac68SChris Mason /* 798d352ac68SChris Mason * dead roots are old snapshots that need to be deleted. This allocates 799d352ac68SChris Mason * a dirty root struct and adds it into the list of dead roots that need to 800d352ac68SChris Mason * be deleted 801d352ac68SChris Mason */ 8025d4f98a2SYan Zheng int btrfs_add_dead_root(struct btrfs_root *root) 8035eda7b5eSChris Mason { 804a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 8055d4f98a2SYan Zheng list_add(&root->root_list, &root->fs_info->dead_roots); 806a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 8075eda7b5eSChris Mason return 0; 8085eda7b5eSChris Mason } 8095eda7b5eSChris Mason 810d352ac68SChris Mason /* 8115d4f98a2SYan Zheng * update all the cowonly tree roots on disk 812d352ac68SChris Mason */ 8135d4f98a2SYan Zheng static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, 8145d4f98a2SYan Zheng struct btrfs_root *root) 8150f7d52f4SChris Mason { 8160f7d52f4SChris Mason struct btrfs_root *gang[8]; 8175d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 8180f7d52f4SChris Mason int i; 8190f7d52f4SChris Mason int ret; 82054aa1f4dSChris Mason int err = 0; 82154aa1f4dSChris Mason 822a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 8230f7d52f4SChris Mason while (1) { 8245d4f98a2SYan Zheng ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, 8255d4f98a2SYan Zheng (void **)gang, 0, 8260f7d52f4SChris Mason ARRAY_SIZE(gang), 8270f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 8280f7d52f4SChris Mason if (ret == 0) 8290f7d52f4SChris Mason break; 8300f7d52f4SChris Mason for (i = 0; i < ret; i++) { 8310f7d52f4SChris Mason root = gang[i]; 8325d4f98a2SYan Zheng radix_tree_tag_clear(&fs_info->fs_roots_radix, 8332619ba1fSChris Mason (unsigned long)root->root_key.objectid, 8340f7d52f4SChris Mason BTRFS_ROOT_TRANS_TAG); 835a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 83631153d81SYan Zheng 837e02119d5SChris Mason btrfs_free_log(trans, root); 8385d4f98a2SYan Zheng btrfs_update_reloc_root(trans, root); 839d68fc57bSYan, Zheng btrfs_orphan_commit_root(trans, root); 840e02119d5SChris Mason 84182d5902dSLi Zefan btrfs_save_ino_cache(root, trans); 84282d5902dSLi Zefan 843f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 844f1ebcc74SLiu Bo root->force_cow = 0; 845f1ebcc74SLiu Bo smp_wmb(); 846f1ebcc74SLiu Bo 847978d910dSYan Zheng if (root->commit_root != root->node) { 848581bb050SLi Zefan mutex_lock(&root->fs_commit_mutex); 849817d52f8SJosef Bacik switch_commit_root(root); 850581bb050SLi Zefan btrfs_unpin_free_ino(root); 851581bb050SLi Zefan mutex_unlock(&root->fs_commit_mutex); 852581bb050SLi Zefan 853978d910dSYan Zheng btrfs_set_root_node(&root->root_item, 854978d910dSYan Zheng root->node); 855978d910dSYan Zheng } 85631153d81SYan Zheng 8575d4f98a2SYan Zheng err = btrfs_update_root(trans, fs_info->tree_root, 8580f7d52f4SChris Mason &root->root_key, 8590f7d52f4SChris Mason &root->root_item); 860a4abeea4SJosef Bacik spin_lock(&fs_info->fs_roots_radix_lock); 86154aa1f4dSChris Mason if (err) 86254aa1f4dSChris Mason break; 8630f7d52f4SChris Mason } 8649f3a7427SChris Mason } 865a4abeea4SJosef Bacik spin_unlock(&fs_info->fs_roots_radix_lock); 86654aa1f4dSChris Mason return err; 8670f7d52f4SChris Mason } 8680f7d52f4SChris Mason 869d352ac68SChris Mason /* 870d352ac68SChris Mason * defrag a given btree. If cacheonly == 1, this won't read from the disk, 871d352ac68SChris Mason * otherwise every leaf in the btree is read and defragged. 872d352ac68SChris Mason */ 873e9d0b13bSChris Mason int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) 874e9d0b13bSChris Mason { 875e9d0b13bSChris Mason struct btrfs_fs_info *info = root->fs_info; 876e9d0b13bSChris Mason struct btrfs_trans_handle *trans; 8778929ecfaSYan, Zheng int ret; 878d3c2fdcfSChris Mason unsigned long nr; 879e9d0b13bSChris Mason 8808929ecfaSYan, Zheng if (xchg(&root->defrag_running, 1)) 881e9d0b13bSChris Mason return 0; 8828929ecfaSYan, Zheng 8836b80053dSChris Mason while (1) { 8848929ecfaSYan, Zheng trans = btrfs_start_transaction(root, 0); 8858929ecfaSYan, Zheng if (IS_ERR(trans)) 8868929ecfaSYan, Zheng return PTR_ERR(trans); 8878929ecfaSYan, Zheng 888e9d0b13bSChris Mason ret = btrfs_defrag_leaves(trans, root, cacheonly); 8898929ecfaSYan, Zheng 890d3c2fdcfSChris Mason nr = trans->blocks_used; 891e9d0b13bSChris Mason btrfs_end_transaction(trans, root); 892d3c2fdcfSChris Mason btrfs_btree_balance_dirty(info->tree_root, nr); 893e9d0b13bSChris Mason cond_resched(); 894e9d0b13bSChris Mason 8957841cb28SDavid Sterba if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) 896e9d0b13bSChris Mason break; 897e9d0b13bSChris Mason } 898e9d0b13bSChris Mason root->defrag_running = 0; 8998929ecfaSYan, Zheng return ret; 900e9d0b13bSChris Mason } 901e9d0b13bSChris Mason 902d352ac68SChris Mason /* 903d352ac68SChris Mason * new snapshots need to be created at a very specific time in the 904d352ac68SChris Mason * transaction commit. This does the actual creation 905d352ac68SChris Mason */ 90680b6794dSChris Mason static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, 9073063d29fSChris Mason struct btrfs_fs_info *fs_info, 9083063d29fSChris Mason struct btrfs_pending_snapshot *pending) 9093063d29fSChris Mason { 9103063d29fSChris Mason struct btrfs_key key; 91180b6794dSChris Mason struct btrfs_root_item *new_root_item; 9123063d29fSChris Mason struct btrfs_root *tree_root = fs_info->tree_root; 9133063d29fSChris Mason struct btrfs_root *root = pending->root; 9146bdb72deSSage Weil struct btrfs_root *parent_root; 91598c9942aSLiu Bo struct btrfs_block_rsv *rsv; 9166bdb72deSSage Weil struct inode *parent_inode; 9176a912213SJosef Bacik struct dentry *parent; 918a22285a6SYan, Zheng struct dentry *dentry; 9193063d29fSChris Mason struct extent_buffer *tmp; 920925baeddSChris Mason struct extent_buffer *old; 9213063d29fSChris Mason int ret; 922d68fc57bSYan, Zheng u64 to_reserve = 0; 9236bdb72deSSage Weil u64 index = 0; 924a22285a6SYan, Zheng u64 objectid; 925b83cc969SLi Zefan u64 root_flags; 9263063d29fSChris Mason 92798c9942aSLiu Bo rsv = trans->block_rsv; 92898c9942aSLiu Bo 92980b6794dSChris Mason new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); 93080b6794dSChris Mason if (!new_root_item) { 93149b25e05SJeff Mahoney ret = pending->error = -ENOMEM; 93280b6794dSChris Mason goto fail; 93380b6794dSChris Mason } 934a22285a6SYan, Zheng 935581bb050SLi Zefan ret = btrfs_find_free_objectid(tree_root, &objectid); 936a22285a6SYan, Zheng if (ret) { 937a22285a6SYan, Zheng pending->error = ret; 9383063d29fSChris Mason goto fail; 939a22285a6SYan, Zheng } 9403063d29fSChris Mason 9413fd0a558SYan, Zheng btrfs_reloc_pre_snapshot(trans, pending, &to_reserve); 942d68fc57bSYan, Zheng 943d68fc57bSYan, Zheng if (to_reserve > 0) { 94462f30c54SMiao Xie ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv, 9458bb8ab2eSJosef Bacik to_reserve); 946d68fc57bSYan, Zheng if (ret) { 947d68fc57bSYan, Zheng pending->error = ret; 948d68fc57bSYan, Zheng goto fail; 949d68fc57bSYan, Zheng } 950d68fc57bSYan, Zheng } 951d68fc57bSYan, Zheng 9523063d29fSChris Mason key.objectid = objectid; 953a22285a6SYan, Zheng key.offset = (u64)-1; 954a22285a6SYan, Zheng key.type = BTRFS_ROOT_ITEM_KEY; 9553063d29fSChris Mason 956a22285a6SYan, Zheng trans->block_rsv = &pending->block_rsv; 9576bdb72deSSage Weil 958a22285a6SYan, Zheng dentry = pending->dentry; 9596a912213SJosef Bacik parent = dget_parent(dentry); 9606a912213SJosef Bacik parent_inode = parent->d_inode; 961a22285a6SYan, Zheng parent_root = BTRFS_I(parent_inode)->root; 9627585717fSChris Mason record_root_in_trans(trans, parent_root); 963a22285a6SYan, Zheng 9646bdb72deSSage Weil /* 9656bdb72deSSage Weil * insert the directory item 9666bdb72deSSage Weil */ 9676bdb72deSSage Weil ret = btrfs_set_inode_index(parent_inode, &index); 96849b25e05SJeff Mahoney BUG_ON(ret); /* -ENOMEM */ 9696bdb72deSSage Weil ret = btrfs_insert_dir_item(trans, parent_root, 970a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len, 97116cdcec7SMiao Xie parent_inode, &key, 972a22285a6SYan, Zheng BTRFS_FT_DIR, index); 97379787eaaSJeff Mahoney if (ret == -EEXIST) { 974fe66a05aSChris Mason pending->error = -EEXIST; 975fe66a05aSChris Mason dput(parent); 976fe66a05aSChris Mason goto fail; 97779787eaaSJeff Mahoney } else if (ret) { 97879787eaaSJeff Mahoney goto abort_trans_dput; 97979787eaaSJeff Mahoney } 9806bdb72deSSage Weil 981a22285a6SYan, Zheng btrfs_i_size_write(parent_inode, parent_inode->i_size + 982a22285a6SYan, Zheng dentry->d_name.len * 2); 9836bdb72deSSage Weil ret = btrfs_update_inode(trans, parent_root, parent_inode); 98449b25e05SJeff Mahoney if (ret) 98579787eaaSJeff Mahoney goto abort_trans_dput; 9866bdb72deSSage Weil 987e999376fSChris Mason /* 988e999376fSChris Mason * pull in the delayed directory update 989e999376fSChris Mason * and the delayed inode item 990e999376fSChris Mason * otherwise we corrupt the FS during 991e999376fSChris Mason * snapshot 992e999376fSChris Mason */ 993e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 99479787eaaSJeff Mahoney if (ret) { /* Transaction aborted */ 99579787eaaSJeff Mahoney dput(parent); 99649b25e05SJeff Mahoney goto fail; 99779787eaaSJeff Mahoney } 998e999376fSChris Mason 9997585717fSChris Mason record_root_in_trans(trans, root); 10006bdb72deSSage Weil btrfs_set_root_last_snapshot(&root->root_item, trans->transid); 10016bdb72deSSage Weil memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); 100208fe4db1SLi Zefan btrfs_check_and_init_root_item(new_root_item); 10036bdb72deSSage Weil 1004b83cc969SLi Zefan root_flags = btrfs_root_flags(new_root_item); 1005b83cc969SLi Zefan if (pending->readonly) 1006b83cc969SLi Zefan root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; 1007b83cc969SLi Zefan else 1008b83cc969SLi Zefan root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; 1009b83cc969SLi Zefan btrfs_set_root_flags(new_root_item, root_flags); 1010b83cc969SLi Zefan 1011925baeddSChris Mason old = btrfs_lock_root_node(root); 101249b25e05SJeff Mahoney ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); 101379787eaaSJeff Mahoney if (ret) { 101479787eaaSJeff Mahoney btrfs_tree_unlock(old); 101579787eaaSJeff Mahoney free_extent_buffer(old); 101679787eaaSJeff Mahoney goto abort_trans_dput; 101779787eaaSJeff Mahoney } 101849b25e05SJeff Mahoney 10195d4f98a2SYan Zheng btrfs_set_lock_blocking(old); 10203063d29fSChris Mason 102149b25e05SJeff Mahoney ret = btrfs_copy_root(trans, root, old, &tmp, objectid); 102279787eaaSJeff Mahoney /* clean up in any case */ 1023925baeddSChris Mason btrfs_tree_unlock(old); 1024925baeddSChris Mason free_extent_buffer(old); 102579787eaaSJeff Mahoney if (ret) 102679787eaaSJeff Mahoney goto abort_trans_dput; 10273063d29fSChris Mason 1028f1ebcc74SLiu Bo /* see comments in should_cow_block() */ 1029f1ebcc74SLiu Bo root->force_cow = 1; 1030f1ebcc74SLiu Bo smp_wmb(); 1031f1ebcc74SLiu Bo 10325d4f98a2SYan Zheng btrfs_set_root_node(new_root_item, tmp); 1033a22285a6SYan, Zheng /* record when the snapshot was created in key.offset */ 1034a22285a6SYan, Zheng key.offset = trans->transid; 1035a22285a6SYan, Zheng ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); 1036925baeddSChris Mason btrfs_tree_unlock(tmp); 10373063d29fSChris Mason free_extent_buffer(tmp); 103849b25e05SJeff Mahoney if (ret) 103979787eaaSJeff Mahoney goto abort_trans_dput; 10400660b5afSChris Mason 1041a22285a6SYan, Zheng /* 1042a22285a6SYan, Zheng * insert root back/forward references 1043a22285a6SYan, Zheng */ 1044a22285a6SYan, Zheng ret = btrfs_add_root_ref(trans, tree_root, objectid, 1045a22285a6SYan, Zheng parent_root->root_key.objectid, 104633345d01SLi Zefan btrfs_ino(parent_inode), index, 1047a22285a6SYan, Zheng dentry->d_name.name, dentry->d_name.len); 104879787eaaSJeff Mahoney dput(parent); 104949b25e05SJeff Mahoney if (ret) 105049b25e05SJeff Mahoney goto fail; 1051a22285a6SYan, Zheng 1052a22285a6SYan, Zheng key.offset = (u64)-1; 1053a22285a6SYan, Zheng pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); 105479787eaaSJeff Mahoney if (IS_ERR(pending->snap)) { 105579787eaaSJeff Mahoney ret = PTR_ERR(pending->snap); 105649b25e05SJeff Mahoney goto abort_trans; 105779787eaaSJeff Mahoney } 1058d68fc57bSYan, Zheng 105949b25e05SJeff Mahoney ret = btrfs_reloc_post_snapshot(trans, pending); 106049b25e05SJeff Mahoney if (ret) 106149b25e05SJeff Mahoney goto abort_trans; 106249b25e05SJeff Mahoney ret = 0; 10633063d29fSChris Mason fail: 10646bdb72deSSage Weil kfree(new_root_item); 106598c9942aSLiu Bo trans->block_rsv = rsv; 1066a22285a6SYan, Zheng btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1); 106749b25e05SJeff Mahoney return ret; 106849b25e05SJeff Mahoney 106979787eaaSJeff Mahoney abort_trans_dput: 107079787eaaSJeff Mahoney dput(parent); 107149b25e05SJeff Mahoney abort_trans: 107249b25e05SJeff Mahoney btrfs_abort_transaction(trans, root, ret); 107349b25e05SJeff Mahoney goto fail; 10743063d29fSChris Mason } 10753063d29fSChris Mason 1076d352ac68SChris Mason /* 1077d352ac68SChris Mason * create all the snapshots we've scheduled for creation 1078d352ac68SChris Mason */ 107980b6794dSChris Mason static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, 10803063d29fSChris Mason struct btrfs_fs_info *fs_info) 10813063d29fSChris Mason { 10823063d29fSChris Mason struct btrfs_pending_snapshot *pending; 10833063d29fSChris Mason struct list_head *head = &trans->transaction->pending_snapshots; 10843de4586cSChris Mason 1085fe66a05aSChris Mason list_for_each_entry(pending, head, list) 1086fe66a05aSChris Mason create_pending_snapshot(trans, fs_info, pending); 10873de4586cSChris Mason return 0; 10883de4586cSChris Mason } 10893de4586cSChris Mason 10905d4f98a2SYan Zheng static void update_super_roots(struct btrfs_root *root) 10915d4f98a2SYan Zheng { 10925d4f98a2SYan Zheng struct btrfs_root_item *root_item; 10935d4f98a2SYan Zheng struct btrfs_super_block *super; 10945d4f98a2SYan Zheng 10956c41761fSDavid Sterba super = root->fs_info->super_copy; 10965d4f98a2SYan Zheng 10975d4f98a2SYan Zheng root_item = &root->fs_info->chunk_root->root_item; 10985d4f98a2SYan Zheng super->chunk_root = root_item->bytenr; 10995d4f98a2SYan Zheng super->chunk_root_generation = root_item->generation; 11005d4f98a2SYan Zheng super->chunk_root_level = root_item->level; 11015d4f98a2SYan Zheng 11025d4f98a2SYan Zheng root_item = &root->fs_info->tree_root->root_item; 11035d4f98a2SYan Zheng super->root = root_item->bytenr; 11045d4f98a2SYan Zheng super->generation = root_item->generation; 11055d4f98a2SYan Zheng super->root_level = root_item->level; 110673bc1876SJosef Bacik if (btrfs_test_opt(root, SPACE_CACHE)) 11070af3d00bSJosef Bacik super->cache_generation = root_item->generation; 11085d4f98a2SYan Zheng } 11095d4f98a2SYan Zheng 1110f36f3042SChris Mason int btrfs_transaction_in_commit(struct btrfs_fs_info *info) 1111f36f3042SChris Mason { 1112f36f3042SChris Mason int ret = 0; 1113a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 1114f36f3042SChris Mason if (info->running_transaction) 1115f36f3042SChris Mason ret = info->running_transaction->in_commit; 1116a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 1117f36f3042SChris Mason return ret; 1118f36f3042SChris Mason } 1119f36f3042SChris Mason 11208929ecfaSYan, Zheng int btrfs_transaction_blocked(struct btrfs_fs_info *info) 11218929ecfaSYan, Zheng { 11228929ecfaSYan, Zheng int ret = 0; 1123a4abeea4SJosef Bacik spin_lock(&info->trans_lock); 11248929ecfaSYan, Zheng if (info->running_transaction) 11258929ecfaSYan, Zheng ret = info->running_transaction->blocked; 1126a4abeea4SJosef Bacik spin_unlock(&info->trans_lock); 11278929ecfaSYan, Zheng return ret; 11288929ecfaSYan, Zheng } 11298929ecfaSYan, Zheng 1130bb9c12c9SSage Weil /* 1131bb9c12c9SSage Weil * wait for the current transaction commit to start and block subsequent 1132bb9c12c9SSage Weil * transaction joins 1133bb9c12c9SSage Weil */ 1134bb9c12c9SSage Weil static void wait_current_trans_commit_start(struct btrfs_root *root, 1135bb9c12c9SSage Weil struct btrfs_transaction *trans) 1136bb9c12c9SSage Weil { 113772d63ed6SLi Zefan wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit); 1138bb9c12c9SSage Weil } 1139bb9c12c9SSage Weil 1140bb9c12c9SSage Weil /* 1141bb9c12c9SSage Weil * wait for the current transaction to start and then become unblocked. 1142bb9c12c9SSage Weil * caller holds ref. 1143bb9c12c9SSage Weil */ 1144bb9c12c9SSage Weil static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, 1145bb9c12c9SSage Weil struct btrfs_transaction *trans) 1146bb9c12c9SSage Weil { 114772d63ed6SLi Zefan wait_event(root->fs_info->transaction_wait, 114872d63ed6SLi Zefan trans->commit_done || (trans->in_commit && !trans->blocked)); 1149bb9c12c9SSage Weil } 1150bb9c12c9SSage Weil 1151bb9c12c9SSage Weil /* 1152bb9c12c9SSage Weil * commit transactions asynchronously. once btrfs_commit_transaction_async 1153bb9c12c9SSage Weil * returns, any subsequent transaction will not be allowed to join. 1154bb9c12c9SSage Weil */ 1155bb9c12c9SSage Weil struct btrfs_async_commit { 1156bb9c12c9SSage Weil struct btrfs_trans_handle *newtrans; 1157bb9c12c9SSage Weil struct btrfs_root *root; 1158bb9c12c9SSage Weil struct delayed_work work; 1159bb9c12c9SSage Weil }; 1160bb9c12c9SSage Weil 1161bb9c12c9SSage Weil static void do_async_commit(struct work_struct *work) 1162bb9c12c9SSage Weil { 1163bb9c12c9SSage Weil struct btrfs_async_commit *ac = 1164bb9c12c9SSage Weil container_of(work, struct btrfs_async_commit, work.work); 1165bb9c12c9SSage Weil 1166bb9c12c9SSage Weil btrfs_commit_transaction(ac->newtrans, ac->root); 1167bb9c12c9SSage Weil kfree(ac); 1168bb9c12c9SSage Weil } 1169bb9c12c9SSage Weil 1170bb9c12c9SSage Weil int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 1171bb9c12c9SSage Weil struct btrfs_root *root, 1172bb9c12c9SSage Weil int wait_for_unblock) 1173bb9c12c9SSage Weil { 1174bb9c12c9SSage Weil struct btrfs_async_commit *ac; 1175bb9c12c9SSage Weil struct btrfs_transaction *cur_trans; 1176bb9c12c9SSage Weil 1177bb9c12c9SSage Weil ac = kmalloc(sizeof(*ac), GFP_NOFS); 1178db5b493aSTsutomu Itoh if (!ac) 1179db5b493aSTsutomu Itoh return -ENOMEM; 1180bb9c12c9SSage Weil 1181bb9c12c9SSage Weil INIT_DELAYED_WORK(&ac->work, do_async_commit); 1182bb9c12c9SSage Weil ac->root = root; 11837a7eaa40SJosef Bacik ac->newtrans = btrfs_join_transaction(root); 11843612b495STsutomu Itoh if (IS_ERR(ac->newtrans)) { 11853612b495STsutomu Itoh int err = PTR_ERR(ac->newtrans); 11863612b495STsutomu Itoh kfree(ac); 11873612b495STsutomu Itoh return err; 11883612b495STsutomu Itoh } 1189bb9c12c9SSage Weil 1190bb9c12c9SSage Weil /* take transaction reference */ 1191bb9c12c9SSage Weil cur_trans = trans->transaction; 119213c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 1193bb9c12c9SSage Weil 1194bb9c12c9SSage Weil btrfs_end_transaction(trans, root); 1195bb9c12c9SSage Weil schedule_delayed_work(&ac->work, 0); 1196bb9c12c9SSage Weil 1197bb9c12c9SSage Weil /* wait for transaction to start and unblock */ 1198bb9c12c9SSage Weil if (wait_for_unblock) 1199bb9c12c9SSage Weil wait_current_trans_commit_start_and_unblock(root, cur_trans); 1200bb9c12c9SSage Weil else 1201bb9c12c9SSage Weil wait_current_trans_commit_start(root, cur_trans); 1202bb9c12c9SSage Weil 120338e88054SSage Weil if (current->journal_info == trans) 120438e88054SSage Weil current->journal_info = NULL; 120538e88054SSage Weil 120638e88054SSage Weil put_transaction(cur_trans); 1207bb9c12c9SSage Weil return 0; 1208bb9c12c9SSage Weil } 1209bb9c12c9SSage Weil 121049b25e05SJeff Mahoney 121149b25e05SJeff Mahoney static void cleanup_transaction(struct btrfs_trans_handle *trans, 121249b25e05SJeff Mahoney struct btrfs_root *root) 121349b25e05SJeff Mahoney { 121449b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 121549b25e05SJeff Mahoney 121649b25e05SJeff Mahoney WARN_ON(trans->use_count > 1); 121749b25e05SJeff Mahoney 121849b25e05SJeff Mahoney spin_lock(&root->fs_info->trans_lock); 121949b25e05SJeff Mahoney list_del_init(&cur_trans->list); 122049b25e05SJeff Mahoney spin_unlock(&root->fs_info->trans_lock); 122149b25e05SJeff Mahoney 122249b25e05SJeff Mahoney btrfs_cleanup_one_transaction(trans->transaction, root); 122349b25e05SJeff Mahoney 122449b25e05SJeff Mahoney put_transaction(cur_trans); 122549b25e05SJeff Mahoney put_transaction(cur_trans); 122649b25e05SJeff Mahoney 122749b25e05SJeff Mahoney trace_btrfs_transaction_commit(root); 122849b25e05SJeff Mahoney 122949b25e05SJeff Mahoney btrfs_scrub_continue(root); 123049b25e05SJeff Mahoney 123149b25e05SJeff Mahoney if (current->journal_info == trans) 123249b25e05SJeff Mahoney current->journal_info = NULL; 123349b25e05SJeff Mahoney 123449b25e05SJeff Mahoney kmem_cache_free(btrfs_trans_handle_cachep, trans); 123549b25e05SJeff Mahoney } 123649b25e05SJeff Mahoney 1237bb9c12c9SSage Weil /* 1238bb9c12c9SSage Weil * btrfs_transaction state sequence: 1239bb9c12c9SSage Weil * in_commit = 0, blocked = 0 (initial) 1240bb9c12c9SSage Weil * in_commit = 1, blocked = 1 1241bb9c12c9SSage Weil * blocked = 0 1242bb9c12c9SSage Weil * commit_done = 1 1243bb9c12c9SSage Weil */ 124479154b1bSChris Mason int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 124579154b1bSChris Mason struct btrfs_root *root) 124679154b1bSChris Mason { 124715ee9bc7SJosef Bacik unsigned long joined = 0; 124849b25e05SJeff Mahoney struct btrfs_transaction *cur_trans = trans->transaction; 12498fd17795SChris Mason struct btrfs_transaction *prev_trans = NULL; 125079154b1bSChris Mason DEFINE_WAIT(wait); 125149b25e05SJeff Mahoney int ret = -EIO; 125289573b9cSChris Mason int should_grow = 0; 125389573b9cSChris Mason unsigned long now = get_seconds(); 1254dccae999SSage Weil int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); 125579154b1bSChris Mason 12565a3f23d5SChris Mason btrfs_run_ordered_operations(root, 0); 12575a3f23d5SChris Mason 1258b24e03dbSJosef Bacik btrfs_trans_release_metadata(trans, root); 12599c8d86dbSJosef Bacik trans->block_rsv = NULL; 12609c8d86dbSJosef Bacik 126149b25e05SJeff Mahoney if (cur_trans->aborted) 126249b25e05SJeff Mahoney goto cleanup_transaction; 126349b25e05SJeff Mahoney 126456bec294SChris Mason /* make a pass through all the delayed refs we have so far 126556bec294SChris Mason * any runnings procs may add more while we are here 126656bec294SChris Mason */ 126756bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 126849b25e05SJeff Mahoney if (ret) 126949b25e05SJeff Mahoney goto cleanup_transaction; 127056bec294SChris Mason 1271b7ec40d7SChris Mason cur_trans = trans->transaction; 127249b25e05SJeff Mahoney 127356bec294SChris Mason /* 127456bec294SChris Mason * set the flushing flag so procs in this transaction have to 127556bec294SChris Mason * start sending their work down. 127656bec294SChris Mason */ 1277b7ec40d7SChris Mason cur_trans->delayed_refs.flushing = 1; 127856bec294SChris Mason 1279c3e69d58SChris Mason ret = btrfs_run_delayed_refs(trans, root, 0); 128049b25e05SJeff Mahoney if (ret) 128149b25e05SJeff Mahoney goto cleanup_transaction; 128256bec294SChris Mason 1283a4abeea4SJosef Bacik spin_lock(&cur_trans->commit_lock); 1284b7ec40d7SChris Mason if (cur_trans->in_commit) { 1285a4abeea4SJosef Bacik spin_unlock(&cur_trans->commit_lock); 128613c5a93eSJosef Bacik atomic_inc(&cur_trans->use_count); 128749b25e05SJeff Mahoney ret = btrfs_end_transaction(trans, root); 1288ccd467d6SChris Mason 1289b9c8300cSLi Zefan wait_for_commit(root, cur_trans); 129015ee9bc7SJosef Bacik 129179154b1bSChris Mason put_transaction(cur_trans); 129215ee9bc7SJosef Bacik 129349b25e05SJeff Mahoney return ret; 129479154b1bSChris Mason } 12954313b399SChris Mason 12962c90e5d6SChris Mason trans->transaction->in_commit = 1; 1297f9295749SChris Mason trans->transaction->blocked = 1; 1298a4abeea4SJosef Bacik spin_unlock(&cur_trans->commit_lock); 1299bb9c12c9SSage Weil wake_up(&root->fs_info->transaction_blocked_wait); 1300bb9c12c9SSage Weil 1301a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1302ccd467d6SChris Mason if (cur_trans->list.prev != &root->fs_info->trans_list) { 1303ccd467d6SChris Mason prev_trans = list_entry(cur_trans->list.prev, 1304ccd467d6SChris Mason struct btrfs_transaction, list); 1305ccd467d6SChris Mason if (!prev_trans->commit_done) { 130613c5a93eSJosef Bacik atomic_inc(&prev_trans->use_count); 1307a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1308ccd467d6SChris Mason 1309ccd467d6SChris Mason wait_for_commit(root, prev_trans); 1310ccd467d6SChris Mason 131115ee9bc7SJosef Bacik put_transaction(prev_trans); 1312a4abeea4SJosef Bacik } else { 1313a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1314ccd467d6SChris Mason } 1315a4abeea4SJosef Bacik } else { 1316a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1317ccd467d6SChris Mason } 131815ee9bc7SJosef Bacik 131989573b9cSChris Mason if (now < cur_trans->start_time || now - cur_trans->start_time < 1) 132089573b9cSChris Mason should_grow = 1; 132189573b9cSChris Mason 132215ee9bc7SJosef Bacik do { 13237ea394f1SYan Zheng int snap_pending = 0; 1324a4abeea4SJosef Bacik 132515ee9bc7SJosef Bacik joined = cur_trans->num_joined; 13267ea394f1SYan Zheng if (!list_empty(&trans->transaction->pending_snapshots)) 13277ea394f1SYan Zheng snap_pending = 1; 13287ea394f1SYan Zheng 13292c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 133015ee9bc7SJosef Bacik 13310bdb1db2SSage Weil if (flush_on_commit || snap_pending) { 133224bbcf04SYan, Zheng btrfs_start_delalloc_inodes(root, 1); 1333143bede5SJeff Mahoney btrfs_wait_ordered_extents(root, 0, 1); 13347ea394f1SYan Zheng } 13357ea394f1SYan Zheng 133616cdcec7SMiao Xie ret = btrfs_run_delayed_items(trans, root); 133749b25e05SJeff Mahoney if (ret) 133849b25e05SJeff Mahoney goto cleanup_transaction; 133916cdcec7SMiao Xie 13405a3f23d5SChris Mason /* 13415a3f23d5SChris Mason * rename don't use btrfs_join_transaction, so, once we 13425a3f23d5SChris Mason * set the transaction to blocked above, we aren't going 13435a3f23d5SChris Mason * to get any new ordered operations. We can safely run 13445a3f23d5SChris Mason * it here and no for sure that nothing new will be added 13455a3f23d5SChris Mason * to the list 13465a3f23d5SChris Mason */ 13475a3f23d5SChris Mason btrfs_run_ordered_operations(root, 1); 13485a3f23d5SChris Mason 1349ed3b3d31SChris Mason prepare_to_wait(&cur_trans->writer_wait, &wait, 1350ed3b3d31SChris Mason TASK_UNINTERRUPTIBLE); 1351ed3b3d31SChris Mason 135213c5a93eSJosef Bacik if (atomic_read(&cur_trans->num_writers) > 1) 135399d16cbcSSage Weil schedule_timeout(MAX_SCHEDULE_TIMEOUT); 135499d16cbcSSage Weil else if (should_grow) 135599d16cbcSSage Weil schedule_timeout(1); 135615ee9bc7SJosef Bacik 135715ee9bc7SJosef Bacik finish_wait(&cur_trans->writer_wait, &wait); 1358ed0ca140SJosef Bacik } while (atomic_read(&cur_trans->num_writers) > 1 || 1359ed0ca140SJosef Bacik (should_grow && cur_trans->num_joined != joined)); 1360ed0ca140SJosef Bacik 1361ed0ca140SJosef Bacik /* 1362ed0ca140SJosef Bacik * Ok now we need to make sure to block out any other joins while we 1363ed0ca140SJosef Bacik * commit the transaction. We could have started a join before setting 1364ed0ca140SJosef Bacik * no_join so make sure to wait for num_writers to == 1 again. 1365ed0ca140SJosef Bacik */ 1366a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1367a4abeea4SJosef Bacik root->fs_info->trans_no_join = 1; 1368a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1369ed0ca140SJosef Bacik wait_event(cur_trans->writer_wait, 1370ed0ca140SJosef Bacik atomic_read(&cur_trans->num_writers) == 1); 137115ee9bc7SJosef Bacik 13727585717fSChris Mason /* 13737585717fSChris Mason * the reloc mutex makes sure that we stop 13747585717fSChris Mason * the balancing code from coming in and moving 13757585717fSChris Mason * extents around in the middle of the commit 13767585717fSChris Mason */ 13777585717fSChris Mason mutex_lock(&root->fs_info->reloc_mutex); 13787585717fSChris Mason 1379e999376fSChris Mason ret = btrfs_run_delayed_items(trans, root); 138049b25e05SJeff Mahoney if (ret) { 138149b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 138249b25e05SJeff Mahoney goto cleanup_transaction; 138349b25e05SJeff Mahoney } 13843063d29fSChris Mason 1385e999376fSChris Mason ret = create_pending_snapshots(trans, root->fs_info); 138649b25e05SJeff Mahoney if (ret) { 138749b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 138849b25e05SJeff Mahoney goto cleanup_transaction; 138949b25e05SJeff Mahoney } 139016cdcec7SMiao Xie 139156bec294SChris Mason ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); 139249b25e05SJeff Mahoney if (ret) { 139349b25e05SJeff Mahoney mutex_unlock(&root->fs_info->reloc_mutex); 139449b25e05SJeff Mahoney goto cleanup_transaction; 139549b25e05SJeff Mahoney } 139656bec294SChris Mason 1397e999376fSChris Mason /* 1398e999376fSChris Mason * make sure none of the code above managed to slip in a 1399e999376fSChris Mason * delayed item 1400e999376fSChris Mason */ 1401e999376fSChris Mason btrfs_assert_delayed_root_empty(root); 1402e999376fSChris Mason 14032c90e5d6SChris Mason WARN_ON(cur_trans != trans->transaction); 1404dc17ff8fSChris Mason 1405a2de733cSArne Jansen btrfs_scrub_pause(root); 1406e02119d5SChris Mason /* btrfs_commit_tree_roots is responsible for getting the 1407e02119d5SChris Mason * various roots consistent with each other. Every pointer 1408e02119d5SChris Mason * in the tree of tree roots has to point to the most up to date 1409e02119d5SChris Mason * root for every subvolume and other tree. So, we have to keep 1410e02119d5SChris Mason * the tree logging code from jumping in and changing any 1411e02119d5SChris Mason * of the trees. 1412e02119d5SChris Mason * 1413e02119d5SChris Mason * At this point in the commit, there can't be any tree-log 1414e02119d5SChris Mason * writers, but a little lower down we drop the trans mutex 1415e02119d5SChris Mason * and let new people in. By holding the tree_log_mutex 1416e02119d5SChris Mason * from now until after the super is written, we avoid races 1417e02119d5SChris Mason * with the tree-log code. 1418e02119d5SChris Mason */ 1419e02119d5SChris Mason mutex_lock(&root->fs_info->tree_log_mutex); 14201a40e23bSZheng Yan 14215d4f98a2SYan Zheng ret = commit_fs_roots(trans, root); 142249b25e05SJeff Mahoney if (ret) { 142349b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 1424871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 142549b25e05SJeff Mahoney goto cleanup_transaction; 142649b25e05SJeff Mahoney } 142754aa1f4dSChris Mason 14285d4f98a2SYan Zheng /* commit_fs_roots gets rid of all the tree log roots, it is now 1429e02119d5SChris Mason * safe to free the root of tree log roots 1430e02119d5SChris Mason */ 1431e02119d5SChris Mason btrfs_free_log_root_tree(trans, root->fs_info); 1432e02119d5SChris Mason 14335d4f98a2SYan Zheng ret = commit_cowonly_roots(trans, root); 143449b25e05SJeff Mahoney if (ret) { 143549b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 1436871383beSDavid Sterba mutex_unlock(&root->fs_info->reloc_mutex); 143749b25e05SJeff Mahoney goto cleanup_transaction; 143849b25e05SJeff Mahoney } 143954aa1f4dSChris Mason 144011833d66SYan Zheng btrfs_prepare_extent_commit(trans, root); 144111833d66SYan Zheng 144278fae27eSChris Mason cur_trans = root->fs_info->running_transaction; 14435f39d397SChris Mason 14445d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->tree_root->root_item, 14455d4f98a2SYan Zheng root->fs_info->tree_root->node); 1446817d52f8SJosef Bacik switch_commit_root(root->fs_info->tree_root); 14475d4f98a2SYan Zheng 14485d4f98a2SYan Zheng btrfs_set_root_node(&root->fs_info->chunk_root->root_item, 14495d4f98a2SYan Zheng root->fs_info->chunk_root->node); 1450817d52f8SJosef Bacik switch_commit_root(root->fs_info->chunk_root); 14515d4f98a2SYan Zheng 14525d4f98a2SYan Zheng update_super_roots(root); 1453e02119d5SChris Mason 1454e02119d5SChris Mason if (!root->fs_info->log_root_recovering) { 14556c41761fSDavid Sterba btrfs_set_super_log_root(root->fs_info->super_copy, 0); 14566c41761fSDavid Sterba btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); 1457e02119d5SChris Mason } 1458e02119d5SChris Mason 14596c41761fSDavid Sterba memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, 14606c41761fSDavid Sterba sizeof(*root->fs_info->super_copy)); 1461ccd467d6SChris Mason 1462f9295749SChris Mason trans->transaction->blocked = 0; 1463a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 1464a4abeea4SJosef Bacik root->fs_info->running_transaction = NULL; 1465a4abeea4SJosef Bacik root->fs_info->trans_no_join = 0; 1466a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 14677585717fSChris Mason mutex_unlock(&root->fs_info->reloc_mutex); 1468b7ec40d7SChris Mason 1469f9295749SChris Mason wake_up(&root->fs_info->transaction_wait); 1470e6dcd2dcSChris Mason 147179154b1bSChris Mason ret = btrfs_write_and_wait_transaction(trans, root); 147249b25e05SJeff Mahoney if (ret) { 147349b25e05SJeff Mahoney btrfs_error(root->fs_info, ret, 147449b25e05SJeff Mahoney "Error while writing out transaction."); 147549b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 147649b25e05SJeff Mahoney goto cleanup_transaction; 147749b25e05SJeff Mahoney } 147849b25e05SJeff Mahoney 147949b25e05SJeff Mahoney ret = write_ctree_super(trans, root, 0); 148049b25e05SJeff Mahoney if (ret) { 148149b25e05SJeff Mahoney mutex_unlock(&root->fs_info->tree_log_mutex); 148249b25e05SJeff Mahoney goto cleanup_transaction; 148349b25e05SJeff Mahoney } 14844313b399SChris Mason 1485e02119d5SChris Mason /* 1486e02119d5SChris Mason * the super is written, we can safely allow the tree-loggers 1487e02119d5SChris Mason * to go about their business 1488e02119d5SChris Mason */ 1489e02119d5SChris Mason mutex_unlock(&root->fs_info->tree_log_mutex); 1490e02119d5SChris Mason 149111833d66SYan Zheng btrfs_finish_extent_commit(trans, root); 14924313b399SChris Mason 14932c90e5d6SChris Mason cur_trans->commit_done = 1; 1494b7ec40d7SChris Mason 149515ee9bc7SJosef Bacik root->fs_info->last_trans_committed = cur_trans->transid; 1496817d52f8SJosef Bacik 14972c90e5d6SChris Mason wake_up(&cur_trans->commit_wait); 14983de4586cSChris Mason 1499a4abeea4SJosef Bacik spin_lock(&root->fs_info->trans_lock); 150013c5a93eSJosef Bacik list_del_init(&cur_trans->list); 1501a4abeea4SJosef Bacik spin_unlock(&root->fs_info->trans_lock); 1502a4abeea4SJosef Bacik 150379154b1bSChris Mason put_transaction(cur_trans); 150478fae27eSChris Mason put_transaction(cur_trans); 150558176a96SJosef Bacik 15061abe9b8aSliubo trace_btrfs_transaction_commit(root); 15071abe9b8aSliubo 1508a2de733cSArne Jansen btrfs_scrub_continue(root); 1509a2de733cSArne Jansen 15109ed74f2dSJosef Bacik if (current->journal_info == trans) 15119ed74f2dSJosef Bacik current->journal_info = NULL; 15129ed74f2dSJosef Bacik 15132c90e5d6SChris Mason kmem_cache_free(btrfs_trans_handle_cachep, trans); 151424bbcf04SYan, Zheng 151524bbcf04SYan, Zheng if (current != root->fs_info->transaction_kthread) 151624bbcf04SYan, Zheng btrfs_run_delayed_iputs(root); 151724bbcf04SYan, Zheng 151879154b1bSChris Mason return ret; 151949b25e05SJeff Mahoney 152049b25e05SJeff Mahoney cleanup_transaction: 152149b25e05SJeff Mahoney btrfs_printk(root->fs_info, "Skipping commit of aborted transaction.\n"); 152249b25e05SJeff Mahoney // WARN_ON(1); 152349b25e05SJeff Mahoney if (current->journal_info == trans) 152449b25e05SJeff Mahoney current->journal_info = NULL; 152549b25e05SJeff Mahoney cleanup_transaction(trans, root); 152649b25e05SJeff Mahoney 152749b25e05SJeff Mahoney return ret; 152879154b1bSChris Mason } 152979154b1bSChris Mason 1530d352ac68SChris Mason /* 1531d352ac68SChris Mason * interface function to delete all the snapshots we have scheduled for deletion 1532d352ac68SChris Mason */ 1533e9d0b13bSChris Mason int btrfs_clean_old_snapshots(struct btrfs_root *root) 1534e9d0b13bSChris Mason { 15355d4f98a2SYan Zheng LIST_HEAD(list); 15365d4f98a2SYan Zheng struct btrfs_fs_info *fs_info = root->fs_info; 1537e9d0b13bSChris Mason 1538a4abeea4SJosef Bacik spin_lock(&fs_info->trans_lock); 15395d4f98a2SYan Zheng list_splice_init(&fs_info->dead_roots, &list); 1540a4abeea4SJosef Bacik spin_unlock(&fs_info->trans_lock); 15415d4f98a2SYan Zheng 15425d4f98a2SYan Zheng while (!list_empty(&list)) { 15432c536799SJeff Mahoney int ret; 15442c536799SJeff Mahoney 15455d4f98a2SYan Zheng root = list_entry(list.next, struct btrfs_root, root_list); 154676dda93cSYan, Zheng list_del(&root->root_list); 154776dda93cSYan, Zheng 154816cdcec7SMiao Xie btrfs_kill_all_delayed_nodes(root); 154916cdcec7SMiao Xie 155076dda93cSYan, Zheng if (btrfs_header_backref_rev(root->node) < 155176dda93cSYan, Zheng BTRFS_MIXED_BACKREF_REV) 15522c536799SJeff Mahoney ret = btrfs_drop_snapshot(root, NULL, 0, 0); 155376dda93cSYan, Zheng else 15542c536799SJeff Mahoney ret =btrfs_drop_snapshot(root, NULL, 1, 0); 15552c536799SJeff Mahoney BUG_ON(ret < 0); 1556e9d0b13bSChris Mason } 1557e9d0b13bSChris Mason return 0; 1558e9d0b13bSChris Mason } 1559