Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 19 | #include <linux/fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Chris Mason | 3408878 | 2007-06-12 11:36:58 -0400 | [diff] [blame] | 21 | #include <linux/sched.h> |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 22 | #include <linux/writeback.h> |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 23 | #include <linux/pagemap.h> |
Chris Mason | 5f2cc08 | 2008-11-07 18:22:45 -0500 | [diff] [blame] | 24 | #include <linux/blkdev.h> |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 25 | #include <linux/uuid.h> |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 26 | #include "ctree.h" |
| 27 | #include "disk-io.h" |
| 28 | #include "transaction.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 29 | #include "locking.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 30 | #include "tree-log.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 31 | #include "inode-map.h" |
Stefan Behrens | 733f4fb | 2012-05-25 16:06:10 +0200 | [diff] [blame] | 32 | #include "volumes.h" |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 33 | #include "dev-replace.h" |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 34 | #include "qgroup.h" |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 35 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 36 | #define BTRFS_ROOT_TRANS_TAG 0 |
| 37 | |
David Sterba | e8c9f18 | 2015-01-02 18:23:10 +0100 | [diff] [blame] | 38 | static const unsigned int btrfs_blocked_trans_types[TRANS_STATE_MAX] = { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 39 | [TRANS_STATE_RUNNING] = 0U, |
| 40 | [TRANS_STATE_BLOCKED] = (__TRANS_USERSPACE | |
| 41 | __TRANS_START), |
| 42 | [TRANS_STATE_COMMIT_START] = (__TRANS_USERSPACE | |
| 43 | __TRANS_START | |
| 44 | __TRANS_ATTACH), |
| 45 | [TRANS_STATE_COMMIT_DOING] = (__TRANS_USERSPACE | |
| 46 | __TRANS_START | |
| 47 | __TRANS_ATTACH | |
| 48 | __TRANS_JOIN), |
| 49 | [TRANS_STATE_UNBLOCKED] = (__TRANS_USERSPACE | |
| 50 | __TRANS_START | |
| 51 | __TRANS_ATTACH | |
| 52 | __TRANS_JOIN | |
| 53 | __TRANS_JOIN_NOLOCK), |
| 54 | [TRANS_STATE_COMPLETED] = (__TRANS_USERSPACE | |
| 55 | __TRANS_START | |
| 56 | __TRANS_ATTACH | |
| 57 | __TRANS_JOIN | |
| 58 | __TRANS_JOIN_NOLOCK), |
| 59 | }; |
| 60 | |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 61 | void btrfs_put_transaction(struct btrfs_transaction *transaction) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 62 | { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 63 | WARN_ON(atomic_read(&transaction->use_count) == 0); |
| 64 | if (atomic_dec_and_test(&transaction->use_count)) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 65 | BUG_ON(!list_empty(&transaction->list)); |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 66 | WARN_ON(!RB_EMPTY_ROOT(&transaction->delayed_refs.href_root)); |
Josef Bacik | 1262133 | 2015-02-03 07:50:16 -0800 | [diff] [blame] | 67 | if (transaction->delayed_refs.pending_csums) |
| 68 | printk(KERN_ERR "pending csums is %llu\n", |
| 69 | transaction->delayed_refs.pending_csums); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 70 | while (!list_empty(&transaction->pending_chunks)) { |
| 71 | struct extent_map *em; |
| 72 | |
| 73 | em = list_first_entry(&transaction->pending_chunks, |
| 74 | struct extent_map, list); |
| 75 | list_del_init(&em->list); |
| 76 | free_extent_map(em); |
| 77 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 78 | kmem_cache_free(btrfs_transaction_cachep, transaction); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 79 | } |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 80 | } |
| 81 | |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 82 | static void clear_btree_io_tree(struct extent_io_tree *tree) |
| 83 | { |
| 84 | spin_lock(&tree->lock); |
David Sterba | b666a9c | 2015-10-10 18:24:48 +0200 | [diff] [blame] | 85 | /* |
| 86 | * Do a single barrier for the waitqueue_active check here, the state |
| 87 | * of the waitqueue should not change once clear_btree_io_tree is |
| 88 | * called. |
| 89 | */ |
| 90 | smp_mb(); |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 91 | while (!RB_EMPTY_ROOT(&tree->state)) { |
| 92 | struct rb_node *node; |
| 93 | struct extent_state *state; |
| 94 | |
| 95 | node = rb_first(&tree->state); |
| 96 | state = rb_entry(node, struct extent_state, rb_node); |
| 97 | rb_erase(&state->rb_node, &tree->state); |
| 98 | RB_CLEAR_NODE(&state->rb_node); |
| 99 | /* |
| 100 | * btree io trees aren't supposed to have tasks waiting for |
| 101 | * changes in the flags of extent states ever. |
| 102 | */ |
| 103 | ASSERT(!waitqueue_active(&state->wq)); |
| 104 | free_extent_state(state); |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 105 | |
| 106 | cond_resched_lock(&tree->lock); |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 107 | } |
| 108 | spin_unlock(&tree->lock); |
| 109 | } |
| 110 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 111 | static noinline void switch_commit_roots(struct btrfs_transaction *trans, |
| 112 | struct btrfs_fs_info *fs_info) |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 113 | { |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 114 | struct btrfs_root *root, *tmp; |
| 115 | |
| 116 | down_write(&fs_info->commit_root_sem); |
| 117 | list_for_each_entry_safe(root, tmp, &trans->switch_commits, |
| 118 | dirty_list) { |
| 119 | list_del_init(&root->dirty_list); |
| 120 | free_extent_buffer(root->commit_root); |
| 121 | root->commit_root = btrfs_root_node(root); |
| 122 | if (is_fstree(root->objectid)) |
| 123 | btrfs_unpin_free_ino(root); |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 124 | clear_btree_io_tree(&root->dirty_log_pages); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 125 | } |
Josef Bacik | 2b9dbef | 2015-09-15 10:07:04 -0400 | [diff] [blame] | 126 | |
| 127 | /* We can free old roots now. */ |
| 128 | spin_lock(&trans->dropped_roots_lock); |
| 129 | while (!list_empty(&trans->dropped_roots)) { |
| 130 | root = list_first_entry(&trans->dropped_roots, |
| 131 | struct btrfs_root, root_list); |
| 132 | list_del_init(&root->root_list); |
| 133 | spin_unlock(&trans->dropped_roots_lock); |
| 134 | btrfs_drop_and_free_fs_root(fs_info, root); |
| 135 | spin_lock(&trans->dropped_roots_lock); |
| 136 | } |
| 137 | spin_unlock(&trans->dropped_roots_lock); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 138 | up_write(&fs_info->commit_root_sem); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 139 | } |
| 140 | |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 141 | static inline void extwriter_counter_inc(struct btrfs_transaction *trans, |
| 142 | unsigned int type) |
| 143 | { |
| 144 | if (type & TRANS_EXTWRITERS) |
| 145 | atomic_inc(&trans->num_extwriters); |
| 146 | } |
| 147 | |
| 148 | static inline void extwriter_counter_dec(struct btrfs_transaction *trans, |
| 149 | unsigned int type) |
| 150 | { |
| 151 | if (type & TRANS_EXTWRITERS) |
| 152 | atomic_dec(&trans->num_extwriters); |
| 153 | } |
| 154 | |
| 155 | static inline void extwriter_counter_init(struct btrfs_transaction *trans, |
| 156 | unsigned int type) |
| 157 | { |
| 158 | atomic_set(&trans->num_extwriters, ((type & TRANS_EXTWRITERS) ? 1 : 0)); |
| 159 | } |
| 160 | |
| 161 | static inline int extwriter_counter_read(struct btrfs_transaction *trans) |
| 162 | { |
| 163 | return atomic_read(&trans->num_extwriters); |
Miao Xie | 178260b | 2013-02-20 09:16:24 +0000 | [diff] [blame] | 164 | } |
| 165 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 166 | /* |
| 167 | * either allocate a new transaction or hop into the existing one |
| 168 | */ |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 169 | static noinline int join_transaction(struct btrfs_root *root, unsigned int type) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 170 | { |
| 171 | struct btrfs_transaction *cur_trans; |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 172 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 173 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 174 | spin_lock(&fs_info->trans_lock); |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 175 | loop: |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 176 | /* The file system has been taken offline. No new transactions. */ |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 177 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 178 | spin_unlock(&fs_info->trans_lock); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 179 | return -EROFS; |
| 180 | } |
| 181 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 182 | cur_trans = fs_info->running_transaction; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 183 | if (cur_trans) { |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 184 | if (cur_trans->aborted) { |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 185 | spin_unlock(&fs_info->trans_lock); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 186 | return cur_trans->aborted; |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 187 | } |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 188 | if (btrfs_blocked_trans_types[cur_trans->state] & type) { |
Miao Xie | 178260b | 2013-02-20 09:16:24 +0000 | [diff] [blame] | 189 | spin_unlock(&fs_info->trans_lock); |
| 190 | return -EBUSY; |
| 191 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 192 | atomic_inc(&cur_trans->use_count); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 193 | atomic_inc(&cur_trans->num_writers); |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 194 | extwriter_counter_inc(cur_trans, type); |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 195 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 196 | return 0; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 197 | } |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 198 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 199 | |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 200 | /* |
| 201 | * If we are ATTACH, we just want to catch the current transaction, |
| 202 | * and commit it. If there is no transaction, just return ENOENT. |
| 203 | */ |
| 204 | if (type == TRANS_ATTACH) |
| 205 | return -ENOENT; |
| 206 | |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 207 | /* |
| 208 | * JOIN_NOLOCK only happens during the transaction commit, so |
| 209 | * it is impossible that ->running_transaction is NULL |
| 210 | */ |
| 211 | BUG_ON(type == TRANS_JOIN_NOLOCK); |
| 212 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 213 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); |
| 214 | if (!cur_trans) |
| 215 | return -ENOMEM; |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 216 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 217 | spin_lock(&fs_info->trans_lock); |
| 218 | if (fs_info->running_transaction) { |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 219 | /* |
| 220 | * someone started a transaction after we unlocked. Make sure |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 221 | * to redo the checks above |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 222 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 223 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 224 | goto loop; |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 225 | } else if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
Dan Carpenter | e4b50e1 | 2012-06-19 13:30:11 +0300 | [diff] [blame] | 226 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 227 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
| 228 | return -EROFS; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 229 | } |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 230 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 231 | atomic_set(&cur_trans->num_writers, 1); |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 232 | extwriter_counter_init(cur_trans, type); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 233 | init_waitqueue_head(&cur_trans->writer_wait); |
| 234 | init_waitqueue_head(&cur_trans->commit_wait); |
Josef Bacik | 161c3549 | 2015-09-24 16:17:39 -0400 | [diff] [blame] | 235 | init_waitqueue_head(&cur_trans->pending_wait); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 236 | cur_trans->state = TRANS_STATE_RUNNING; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 237 | /* |
| 238 | * One for this trans handle, one so it will live on until we |
| 239 | * commit the transaction. |
| 240 | */ |
| 241 | atomic_set(&cur_trans->use_count, 2); |
Josef Bacik | 161c3549 | 2015-09-24 16:17:39 -0400 | [diff] [blame] | 242 | atomic_set(&cur_trans->pending_ordered, 0); |
Josef Bacik | 3204d33 | 2015-09-24 10:46:10 -0400 | [diff] [blame] | 243 | cur_trans->flags = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 244 | cur_trans->start_time = get_seconds(); |
| 245 | |
Alexandru Moise | a099d0f | 2015-09-07 17:24:37 +0300 | [diff] [blame] | 246 | memset(&cur_trans->delayed_refs, 0, sizeof(cur_trans->delayed_refs)); |
| 247 | |
Liu Bo | c46effa | 2013-10-14 12:59:45 +0800 | [diff] [blame] | 248 | cur_trans->delayed_refs.href_root = RB_ROOT; |
Qu Wenruo | 3368d00 | 2015-04-16 14:34:17 +0800 | [diff] [blame] | 249 | cur_trans->delayed_refs.dirty_extent_root = RB_ROOT; |
Josef Bacik | d7df2c7 | 2014-01-23 09:21:38 -0500 | [diff] [blame] | 250 | atomic_set(&cur_trans->delayed_refs.num_entries, 0); |
Jan Schmidt | 20b297d | 2012-05-20 15:43:53 +0200 | [diff] [blame] | 251 | |
| 252 | /* |
| 253 | * although the tree mod log is per file system and not per transaction, |
| 254 | * the log must never go across transaction boundaries. |
| 255 | */ |
| 256 | smp_mb(); |
Julia Lawall | 31b1a2b | 2012-11-03 10:58:34 +0000 | [diff] [blame] | 257 | if (!list_empty(&fs_info->tree_mod_seq_list)) |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 258 | WARN(1, KERN_ERR "BTRFS: tree_mod_seq_list not empty when " |
Jan Schmidt | 20b297d | 2012-05-20 15:43:53 +0200 | [diff] [blame] | 259 | "creating a fresh transaction\n"); |
Julia Lawall | 31b1a2b | 2012-11-03 10:58:34 +0000 | [diff] [blame] | 260 | if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 261 | WARN(1, KERN_ERR "BTRFS: tree_mod_log rb tree not empty when " |
Jan Schmidt | 20b297d | 2012-05-20 15:43:53 +0200 | [diff] [blame] | 262 | "creating a fresh transaction\n"); |
Jan Schmidt | fc36ed7e | 2013-04-24 16:57:33 +0000 | [diff] [blame] | 263 | atomic64_set(&fs_info->tree_mod_seq, 0); |
Jan Schmidt | 20b297d | 2012-05-20 15:43:53 +0200 | [diff] [blame] | 264 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 265 | spin_lock_init(&cur_trans->delayed_refs.lock); |
| 266 | |
| 267 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
Josef Bacik | 6df9a95 | 2013-06-27 13:22:46 -0400 | [diff] [blame] | 268 | INIT_LIST_HEAD(&cur_trans->pending_chunks); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 269 | INIT_LIST_HEAD(&cur_trans->switch_commits); |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 270 | INIT_LIST_HEAD(&cur_trans->dirty_bgs); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 271 | INIT_LIST_HEAD(&cur_trans->io_bgs); |
Josef Bacik | 2b9dbef | 2015-09-15 10:07:04 -0400 | [diff] [blame] | 272 | INIT_LIST_HEAD(&cur_trans->dropped_roots); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 273 | mutex_init(&cur_trans->cache_write_mutex); |
Josef Bacik | cb723e4 | 2015-02-18 08:06:57 -0800 | [diff] [blame] | 274 | cur_trans->num_dirty_bgs = 0; |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 275 | spin_lock_init(&cur_trans->dirty_bgs_lock); |
Jeff Mahoney | e33e17e | 2015-06-15 09:41:19 -0400 | [diff] [blame] | 276 | INIT_LIST_HEAD(&cur_trans->deleted_bgs); |
| 277 | spin_lock_init(&cur_trans->deleted_bgs_lock); |
Josef Bacik | 2b9dbef | 2015-09-15 10:07:04 -0400 | [diff] [blame] | 278 | spin_lock_init(&cur_trans->dropped_roots_lock); |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 279 | list_add_tail(&cur_trans->list, &fs_info->trans_list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 280 | extent_io_tree_init(&cur_trans->dirty_pages, |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 281 | fs_info->btree_inode->i_mapping); |
| 282 | fs_info->generation++; |
| 283 | cur_trans->transid = fs_info->generation; |
| 284 | fs_info->running_transaction = cur_trans; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 285 | cur_trans->aborted = 0; |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 286 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 287 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 288 | return 0; |
| 289 | } |
| 290 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 291 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 292 | * this does all the record keeping required to make sure that a reference |
| 293 | * counted root is properly recorded in a given transaction. This is required |
| 294 | * to make sure the old root from before we joined the transaction is deleted |
| 295 | * when the transaction commits |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 296 | */ |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 297 | static int record_root_in_trans(struct btrfs_trans_handle *trans, |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 298 | struct btrfs_root *root) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 299 | { |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 300 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) && |
| 301 | root->last_trans < trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 302 | WARN_ON(root == root->fs_info->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 303 | WARN_ON(root->commit_root != root->node); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 304 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 305 | /* |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 306 | * see below for IN_TRANS_SETUP usage rules |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 307 | * we have the reloc mutex held now, so there |
| 308 | * is only one writer in this function |
| 309 | */ |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 310 | set_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 311 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 312 | /* make sure readers find IN_TRANS_SETUP before |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 313 | * they find our root->last_trans update |
| 314 | */ |
| 315 | smp_wmb(); |
| 316 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 317 | spin_lock(&root->fs_info->fs_roots_radix_lock); |
| 318 | if (root->last_trans == trans->transid) { |
| 319 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
| 320 | return 0; |
| 321 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 322 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, |
| 323 | (unsigned long)root->root_key.objectid, |
| 324 | BTRFS_ROOT_TRANS_TAG); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 325 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 326 | root->last_trans = trans->transid; |
| 327 | |
| 328 | /* this is pretty tricky. We don't want to |
| 329 | * take the relocation lock in btrfs_record_root_in_trans |
| 330 | * unless we're really doing the first setup for this root in |
| 331 | * this transaction. |
| 332 | * |
| 333 | * Normally we'd use root->last_trans as a flag to decide |
| 334 | * if we want to take the expensive mutex. |
| 335 | * |
| 336 | * But, we have to set root->last_trans before we |
| 337 | * init the relocation root, otherwise, we trip over warnings |
| 338 | * in ctree.c. The solution used here is to flag ourselves |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 339 | * with root IN_TRANS_SETUP. When this is 1, we're still |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 340 | * fixing up the reloc trees and everyone must wait. |
| 341 | * |
| 342 | * When this is zero, they can trust root->last_trans and fly |
| 343 | * through btrfs_record_root_in_trans without having to take the |
| 344 | * lock. smp_wmb() makes sure that all the writes above are |
| 345 | * done before we pop in the zero below |
| 346 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 347 | btrfs_init_reloc_root(trans, root); |
Chris Mason | c7548af | 2014-06-10 13:06:56 -0700 | [diff] [blame] | 348 | smp_mb__before_atomic(); |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 349 | clear_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 350 | } |
| 351 | return 0; |
| 352 | } |
| 353 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 354 | |
Josef Bacik | 2b9dbef | 2015-09-15 10:07:04 -0400 | [diff] [blame] | 355 | void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, |
| 356 | struct btrfs_root *root) |
| 357 | { |
| 358 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 359 | |
| 360 | /* Add ourselves to the transaction dropped list */ |
| 361 | spin_lock(&cur_trans->dropped_roots_lock); |
| 362 | list_add_tail(&root->root_list, &cur_trans->dropped_roots); |
| 363 | spin_unlock(&cur_trans->dropped_roots_lock); |
| 364 | |
| 365 | /* Make sure we don't try to update the root at commit time */ |
| 366 | spin_lock(&root->fs_info->fs_roots_radix_lock); |
| 367 | radix_tree_tag_clear(&root->fs_info->fs_roots_radix, |
| 368 | (unsigned long)root->root_key.objectid, |
| 369 | BTRFS_ROOT_TRANS_TAG); |
| 370 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
| 371 | } |
| 372 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 373 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
| 374 | struct btrfs_root *root) |
| 375 | { |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 376 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 377 | return 0; |
| 378 | |
| 379 | /* |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 380 | * see record_root_in_trans for comments about IN_TRANS_SETUP usage |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 381 | * and barriers |
| 382 | */ |
| 383 | smp_rmb(); |
| 384 | if (root->last_trans == trans->transid && |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 385 | !test_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state)) |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 386 | return 0; |
| 387 | |
| 388 | mutex_lock(&root->fs_info->reloc_mutex); |
| 389 | record_root_in_trans(trans, root); |
| 390 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 395 | static inline int is_transaction_blocked(struct btrfs_transaction *trans) |
| 396 | { |
| 397 | return (trans->state >= TRANS_STATE_BLOCKED && |
Josef Bacik | 501407a | 2013-06-10 16:47:23 -0400 | [diff] [blame] | 398 | trans->state < TRANS_STATE_UNBLOCKED && |
| 399 | !trans->aborted); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 400 | } |
| 401 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 402 | /* wait for commit against the current transaction to become unblocked |
| 403 | * when this is done, it is safe to start a new transaction, but the current |
| 404 | * transaction might not be fully on disk. |
| 405 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 406 | static void wait_current_trans(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 407 | { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 408 | struct btrfs_transaction *cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 409 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 410 | spin_lock(&root->fs_info->trans_lock); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 411 | cur_trans = root->fs_info->running_transaction; |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 412 | if (cur_trans && is_transaction_blocked(cur_trans)) { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 413 | atomic_inc(&cur_trans->use_count); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 414 | spin_unlock(&root->fs_info->trans_lock); |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 415 | |
| 416 | wait_event(root->fs_info->transaction_wait, |
Josef Bacik | 501407a | 2013-06-10 16:47:23 -0400 | [diff] [blame] | 417 | cur_trans->state >= TRANS_STATE_UNBLOCKED || |
| 418 | cur_trans->aborted); |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 419 | btrfs_put_transaction(cur_trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 420 | } else { |
| 421 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 422 | } |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 423 | } |
| 424 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 425 | static int may_wait_transaction(struct btrfs_root *root, int type) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 426 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 427 | if (root->fs_info->log_root_recovering) |
| 428 | return 0; |
| 429 | |
| 430 | if (type == TRANS_USERSPACE) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 431 | return 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 432 | |
| 433 | if (type == TRANS_START && |
| 434 | !atomic_read(&root->fs_info->open_ioctl_trans)) |
| 435 | return 1; |
| 436 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 437 | return 0; |
| 438 | } |
| 439 | |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 440 | static inline bool need_reserve_reloc_root(struct btrfs_root *root) |
| 441 | { |
| 442 | if (!root->fs_info->reloc_ctl || |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 443 | !test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 444 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID || |
| 445 | root->reloc_root) |
| 446 | return false; |
| 447 | |
| 448 | return true; |
| 449 | } |
| 450 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 451 | static struct btrfs_trans_handle * |
Alexandru Moise | 5aed1dd | 2015-09-22 20:59:15 +0000 | [diff] [blame] | 452 | start_transaction(struct btrfs_root *root, unsigned int num_items, |
| 453 | unsigned int type, enum btrfs_reserve_flush_enum flush) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 454 | { |
| 455 | struct btrfs_trans_handle *h; |
| 456 | struct btrfs_transaction *cur_trans; |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 457 | u64 num_bytes = 0; |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 458 | u64 qgroup_reserved = 0; |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 459 | bool reloc_reserved = false; |
| 460 | int ret; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 461 | |
Filipe Manana | 46c4e71 | 2014-06-24 17:48:28 +0100 | [diff] [blame] | 462 | /* Send isn't supposed to start transactions. */ |
David Sterba | 2755a0d | 2014-07-31 00:43:18 +0200 | [diff] [blame] | 463 | ASSERT(current->journal_info != BTRFS_SEND_TRANS_STUB); |
Filipe Manana | 46c4e71 | 2014-06-24 17:48:28 +0100 | [diff] [blame] | 464 | |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 465 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 466 | return ERR_PTR(-EROFS); |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 467 | |
Filipe Manana | 46c4e71 | 2014-06-24 17:48:28 +0100 | [diff] [blame] | 468 | if (current->journal_info) { |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 469 | WARN_ON(type & TRANS_EXTWRITERS); |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 470 | h = current->journal_info; |
| 471 | h->use_count++; |
Miao Xie | b7d5b0a | 2012-11-01 07:32:18 +0000 | [diff] [blame] | 472 | WARN_ON(h->use_count > 2); |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 473 | h->orig_rsv = h->block_rsv; |
| 474 | h->block_rsv = NULL; |
| 475 | goto got_it; |
| 476 | } |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 477 | |
| 478 | /* |
| 479 | * Do the reservation before we join the transaction so we can do all |
| 480 | * the appropriate flushing if need be. |
| 481 | */ |
| 482 | if (num_items > 0 && root != root->fs_info->chunk_root) { |
Qu Wenruo | 7174109 | 2015-09-08 17:22:41 +0800 | [diff] [blame] | 483 | qgroup_reserved = num_items * root->nodesize; |
| 484 | ret = btrfs_qgroup_reserve_meta(root, qgroup_reserved); |
| 485 | if (ret) |
| 486 | return ERR_PTR(ret); |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 487 | |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 488 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 489 | /* |
| 490 | * Do the reservation for the relocation root creation |
| 491 | */ |
David Sterba | ee39b43 | 2014-09-30 01:33:33 +0200 | [diff] [blame] | 492 | if (need_reserve_reloc_root(root)) { |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 493 | num_bytes += root->nodesize; |
| 494 | reloc_reserved = true; |
| 495 | } |
| 496 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 497 | ret = btrfs_block_rsv_add(root, |
| 498 | &root->fs_info->trans_block_rsv, |
| 499 | num_bytes, flush); |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 500 | if (ret) |
Miao Xie | 843fcf3 | 2013-01-28 12:36:22 +0000 | [diff] [blame] | 501 | goto reserve_fail; |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 502 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 503 | again: |
Alexandru Moise | f2f767e | 2015-08-27 23:53:45 +0000 | [diff] [blame] | 504 | h = kmem_cache_zalloc(btrfs_trans_handle_cachep, GFP_NOFS); |
Miao Xie | 843fcf3 | 2013-01-28 12:36:22 +0000 | [diff] [blame] | 505 | if (!h) { |
| 506 | ret = -ENOMEM; |
| 507 | goto alloc_fail; |
| 508 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 509 | |
Josef Bacik | 9811465 | 2012-09-14 11:22:38 -0400 | [diff] [blame] | 510 | /* |
| 511 | * If we are JOIN_NOLOCK we're already committing a transaction and |
| 512 | * waiting on this guy, so we don't need to do the sb_start_intwrite |
| 513 | * because we're already holding a ref. We need this because we could |
| 514 | * have raced in and did an fsync() on a file which can kick a commit |
| 515 | * and then we deadlock with somebody doing a freeze. |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 516 | * |
| 517 | * If we are ATTACH, it means we just want to catch the current |
| 518 | * transaction and commit it, so we needn't do sb_start_intwrite(). |
Josef Bacik | 9811465 | 2012-09-14 11:22:38 -0400 | [diff] [blame] | 519 | */ |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 520 | if (type & __TRANS_FREEZABLE) |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 521 | sb_start_intwrite(root->fs_info->sb); |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 522 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 523 | if (may_wait_transaction(root, type)) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 524 | wait_current_trans(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 525 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 526 | do { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 527 | ret = join_transaction(root, type); |
Miao Xie | 178260b | 2013-02-20 09:16:24 +0000 | [diff] [blame] | 528 | if (ret == -EBUSY) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 529 | wait_current_trans(root); |
Miao Xie | 178260b | 2013-02-20 09:16:24 +0000 | [diff] [blame] | 530 | if (unlikely(type == TRANS_ATTACH)) |
| 531 | ret = -ENOENT; |
| 532 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 533 | } while (ret == -EBUSY); |
| 534 | |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 535 | if (ret < 0) { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 536 | /* We must get the transaction if we are JOIN_NOLOCK. */ |
| 537 | BUG_ON(type == TRANS_JOIN_NOLOCK); |
Miao Xie | 843fcf3 | 2013-01-28 12:36:22 +0000 | [diff] [blame] | 538 | goto join_fail; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 539 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 540 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 541 | cur_trans = root->fs_info->running_transaction; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 542 | |
| 543 | h->transid = cur_trans->transid; |
| 544 | h->transaction = cur_trans; |
Arne Jansen | d13603e | 2011-09-13 11:40:09 +0200 | [diff] [blame] | 545 | h->root = root; |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 546 | h->use_count = 1; |
Qu Wenruo | 7174109 | 2015-09-08 17:22:41 +0800 | [diff] [blame] | 547 | |
Miao Xie | a698d075 | 2012-09-20 01:51:59 -0600 | [diff] [blame] | 548 | h->type = type; |
Filipe Manana | d9a0540 | 2015-10-03 13:13:13 +0100 | [diff] [blame] | 549 | h->can_flush_pending_bgs = true; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 550 | INIT_LIST_HEAD(&h->qgroup_ref_list); |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 551 | INIT_LIST_HEAD(&h->new_bgs); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 552 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 553 | smp_mb(); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 554 | if (cur_trans->state >= TRANS_STATE_BLOCKED && |
| 555 | may_wait_transaction(root, type)) { |
Filipe Manana | abdd2e8 | 2014-06-24 17:46:58 +0100 | [diff] [blame] | 556 | current->journal_info = h; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 557 | btrfs_commit_transaction(h, root); |
| 558 | goto again; |
| 559 | } |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 560 | |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 561 | if (num_bytes) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 562 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 563 | h->transid, num_bytes, 1); |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 564 | h->block_rsv = &root->fs_info->trans_block_rsv; |
| 565 | h->bytes_reserved = num_bytes; |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 566 | h->reloc_reserved = reloc_reserved; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 567 | } |
| 568 | |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 569 | got_it: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 570 | btrfs_record_root_in_trans(h, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 571 | |
| 572 | if (!current->journal_info && type != TRANS_USERSPACE) |
| 573 | current->journal_info = h; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 574 | return h; |
Miao Xie | 843fcf3 | 2013-01-28 12:36:22 +0000 | [diff] [blame] | 575 | |
| 576 | join_fail: |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 577 | if (type & __TRANS_FREEZABLE) |
Miao Xie | 843fcf3 | 2013-01-28 12:36:22 +0000 | [diff] [blame] | 578 | sb_end_intwrite(root->fs_info->sb); |
| 579 | kmem_cache_free(btrfs_trans_handle_cachep, h); |
| 580 | alloc_fail: |
| 581 | if (num_bytes) |
| 582 | btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv, |
| 583 | num_bytes); |
| 584 | reserve_fail: |
Qu Wenruo | 7174109 | 2015-09-08 17:22:41 +0800 | [diff] [blame] | 585 | btrfs_qgroup_free_meta(root, qgroup_reserved); |
Miao Xie | 843fcf3 | 2013-01-28 12:36:22 +0000 | [diff] [blame] | 586 | return ERR_PTR(ret); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 587 | } |
| 588 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 589 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
Alexandru Moise | 5aed1dd | 2015-09-22 20:59:15 +0000 | [diff] [blame] | 590 | unsigned int num_items) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 591 | { |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 592 | return start_transaction(root, num_items, TRANS_START, |
| 593 | BTRFS_RESERVE_FLUSH_ALL); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 594 | } |
Filipe Manana | 8eab77f | 2015-11-13 23:57:16 +0000 | [diff] [blame] | 595 | struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( |
| 596 | struct btrfs_root *root, |
| 597 | unsigned int num_items, |
| 598 | int min_factor) |
| 599 | { |
| 600 | struct btrfs_trans_handle *trans; |
| 601 | u64 num_bytes; |
| 602 | int ret; |
| 603 | |
| 604 | trans = btrfs_start_transaction(root, num_items); |
| 605 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
| 606 | return trans; |
| 607 | |
| 608 | trans = btrfs_start_transaction(root, 0); |
| 609 | if (IS_ERR(trans)) |
| 610 | return trans; |
| 611 | |
| 612 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); |
| 613 | ret = btrfs_cond_migrate_bytes(root->fs_info, |
| 614 | &root->fs_info->trans_block_rsv, |
| 615 | num_bytes, |
| 616 | min_factor); |
| 617 | if (ret) { |
| 618 | btrfs_end_transaction(trans, root); |
| 619 | return ERR_PTR(ret); |
| 620 | } |
| 621 | |
| 622 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
| 623 | trans->bytes_reserved = num_bytes; |
| 624 | |
| 625 | return trans; |
| 626 | } |
Miao Xie | 8407aa4 | 2012-09-07 01:43:32 -0600 | [diff] [blame] | 627 | |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 628 | struct btrfs_trans_handle *btrfs_start_transaction_lflush( |
Alexandru Moise | 5aed1dd | 2015-09-22 20:59:15 +0000 | [diff] [blame] | 629 | struct btrfs_root *root, |
| 630 | unsigned int num_items) |
Miao Xie | 8407aa4 | 2012-09-07 01:43:32 -0600 | [diff] [blame] | 631 | { |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 632 | return start_transaction(root, num_items, TRANS_START, |
| 633 | BTRFS_RESERVE_FLUSH_LIMIT); |
Miao Xie | 8407aa4 | 2012-09-07 01:43:32 -0600 | [diff] [blame] | 634 | } |
| 635 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 636 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 637 | { |
Miao Xie | 8407aa4 | 2012-09-07 01:43:32 -0600 | [diff] [blame] | 638 | return start_transaction(root, 0, TRANS_JOIN, 0); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 639 | } |
| 640 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 641 | struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 642 | { |
Miao Xie | 8407aa4 | 2012-09-07 01:43:32 -0600 | [diff] [blame] | 643 | return start_transaction(root, 0, TRANS_JOIN_NOLOCK, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 644 | } |
| 645 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 646 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 647 | { |
Miao Xie | 8407aa4 | 2012-09-07 01:43:32 -0600 | [diff] [blame] | 648 | return start_transaction(root, 0, TRANS_USERSPACE, 0); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 649 | } |
| 650 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 651 | /* |
| 652 | * btrfs_attach_transaction() - catch the running transaction |
| 653 | * |
| 654 | * It is used when we want to commit the current the transaction, but |
| 655 | * don't want to start a new one. |
| 656 | * |
| 657 | * Note: If this function return -ENOENT, it just means there is no |
| 658 | * running transaction. But it is possible that the inactive transaction |
| 659 | * is still in the memory, not fully on disk. If you hope there is no |
| 660 | * inactive transaction in the fs when -ENOENT is returned, you should |
| 661 | * invoke |
| 662 | * btrfs_attach_transaction_barrier() |
| 663 | */ |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 664 | struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root) |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 665 | { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 666 | return start_transaction(root, 0, TRANS_ATTACH, 0); |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 667 | } |
| 668 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 669 | /* |
Wang Sheng-Hui | 90b6d28 | 2013-06-14 16:21:24 +0800 | [diff] [blame] | 670 | * btrfs_attach_transaction_barrier() - catch the running transaction |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 671 | * |
| 672 | * It is similar to the above function, the differentia is this one |
| 673 | * will wait for all the inactive transactions until they fully |
| 674 | * complete. |
| 675 | */ |
| 676 | struct btrfs_trans_handle * |
| 677 | btrfs_attach_transaction_barrier(struct btrfs_root *root) |
| 678 | { |
| 679 | struct btrfs_trans_handle *trans; |
| 680 | |
| 681 | trans = start_transaction(root, 0, TRANS_ATTACH, 0); |
| 682 | if (IS_ERR(trans) && PTR_ERR(trans) == -ENOENT) |
| 683 | btrfs_wait_for_commit(root, 0); |
| 684 | |
| 685 | return trans; |
| 686 | } |
| 687 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 688 | /* wait for a transaction commit to be fully complete */ |
Li Zefan | b9c8300 | 2011-07-14 03:17:14 +0000 | [diff] [blame] | 689 | static noinline void wait_for_commit(struct btrfs_root *root, |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 690 | struct btrfs_transaction *commit) |
| 691 | { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 692 | wait_event(commit->commit_wait, commit->state == TRANS_STATE_COMPLETED); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 693 | } |
| 694 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 695 | int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) |
| 696 | { |
| 697 | struct btrfs_transaction *cur_trans = NULL, *t; |
Miao Xie | 8cd2807 | 2012-11-26 08:42:07 +0000 | [diff] [blame] | 698 | int ret = 0; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 699 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 700 | if (transid) { |
| 701 | if (transid <= root->fs_info->last_trans_committed) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 702 | goto out; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 703 | |
| 704 | /* find specified transaction */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 705 | spin_lock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 706 | list_for_each_entry(t, &root->fs_info->trans_list, list) { |
| 707 | if (t->transid == transid) { |
| 708 | cur_trans = t; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 709 | atomic_inc(&cur_trans->use_count); |
Miao Xie | 8cd2807 | 2012-11-26 08:42:07 +0000 | [diff] [blame] | 710 | ret = 0; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 711 | break; |
| 712 | } |
Miao Xie | 8cd2807 | 2012-11-26 08:42:07 +0000 | [diff] [blame] | 713 | if (t->transid > transid) { |
| 714 | ret = 0; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 715 | break; |
Miao Xie | 8cd2807 | 2012-11-26 08:42:07 +0000 | [diff] [blame] | 716 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 717 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 718 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 4238302 | 2014-09-26 08:30:06 -0700 | [diff] [blame] | 719 | |
| 720 | /* |
| 721 | * The specified transaction doesn't exist, or we |
| 722 | * raced with btrfs_commit_transaction |
| 723 | */ |
| 724 | if (!cur_trans) { |
| 725 | if (transid > root->fs_info->last_trans_committed) |
| 726 | ret = -EINVAL; |
Miao Xie | 8cd2807 | 2012-11-26 08:42:07 +0000 | [diff] [blame] | 727 | goto out; |
Sage Weil | 4238302 | 2014-09-26 08:30:06 -0700 | [diff] [blame] | 728 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 729 | } else { |
| 730 | /* find newest transaction that is committing | committed */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 731 | spin_lock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 732 | list_for_each_entry_reverse(t, &root->fs_info->trans_list, |
| 733 | list) { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 734 | if (t->state >= TRANS_STATE_COMMIT_START) { |
| 735 | if (t->state == TRANS_STATE_COMPLETED) |
Josef Bacik | 3473f3c | 2011-06-09 10:15:17 -0400 | [diff] [blame] | 736 | break; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 737 | cur_trans = t; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 738 | atomic_inc(&cur_trans->use_count); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 739 | break; |
| 740 | } |
| 741 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 742 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 743 | if (!cur_trans) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 744 | goto out; /* nothing committing|committed */ |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 745 | } |
| 746 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 747 | wait_for_commit(root, cur_trans); |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 748 | btrfs_put_transaction(cur_trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 749 | out: |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 750 | return ret; |
| 751 | } |
| 752 | |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 753 | void btrfs_throttle(struct btrfs_root *root) |
| 754 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 755 | if (!atomic_read(&root->fs_info->open_ioctl_trans)) |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 756 | wait_current_trans(root); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 757 | } |
| 758 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 759 | static int should_end_transaction(struct btrfs_trans_handle *trans, |
| 760 | struct btrfs_root *root) |
| 761 | { |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 762 | if (root->fs_info->global_block_rsv.space_info->full && |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 763 | btrfs_check_space_for_delayed_refs(trans, root)) |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 764 | return 1; |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 765 | |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 766 | return !!btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, |
| 770 | struct btrfs_root *root) |
| 771 | { |
| 772 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 773 | int updates; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 774 | int err; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 775 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 776 | smp_mb(); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 777 | if (cur_trans->state >= TRANS_STATE_BLOCKED || |
| 778 | cur_trans->delayed_refs.flushing) |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 779 | return 1; |
| 780 | |
| 781 | updates = trans->delayed_ref_updates; |
| 782 | trans->delayed_ref_updates = 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 783 | if (updates) { |
Chris Mason | 28ed134 | 2014-12-17 09:41:04 -0800 | [diff] [blame] | 784 | err = btrfs_run_delayed_refs(trans, root, updates * 2); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 785 | if (err) /* Error code will also eval true */ |
| 786 | return err; |
| 787 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 788 | |
| 789 | return should_end_transaction(trans, root); |
| 790 | } |
| 791 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 792 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
Miao Xie | a698d075 | 2012-09-20 01:51:59 -0600 | [diff] [blame] | 793 | struct btrfs_root *root, int throttle) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 794 | { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 795 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 796 | struct btrfs_fs_info *info = root->fs_info; |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 797 | unsigned long cur = trans->delayed_ref_updates; |
Miao Xie | a698d075 | 2012-09-20 01:51:59 -0600 | [diff] [blame] | 798 | int lock = (trans->type != TRANS_JOIN_NOLOCK); |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 799 | int err = 0; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 800 | int must_run_delayed_refs = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 801 | |
Josef Bacik | 3bbb24b | 2014-03-06 19:01:07 -0500 | [diff] [blame] | 802 | if (trans->use_count > 1) { |
| 803 | trans->use_count--; |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 804 | trans->block_rsv = trans->orig_rsv; |
| 805 | return 0; |
| 806 | } |
| 807 | |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 808 | btrfs_trans_release_metadata(trans, root); |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 809 | trans->block_rsv = NULL; |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 810 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 811 | if (!list_empty(&trans->new_bgs)) |
| 812 | btrfs_create_pending_block_groups(trans, root); |
| 813 | |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 814 | trans->delayed_ref_updates = 0; |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 815 | if (!trans->sync) { |
| 816 | must_run_delayed_refs = |
| 817 | btrfs_should_throttle_delayed_refs(trans, root); |
Josef Bacik | 0a2b2a8 | 2014-01-23 10:54:11 -0500 | [diff] [blame] | 818 | cur = max_t(unsigned long, cur, 32); |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 819 | |
| 820 | /* |
| 821 | * don't make the caller wait if they are from a NOLOCK |
| 822 | * or ATTACH transaction, it will deadlock with commit |
| 823 | */ |
| 824 | if (must_run_delayed_refs == 1 && |
| 825 | (trans->type & (__TRANS_JOIN_NOLOCK | __TRANS_ATTACH))) |
| 826 | must_run_delayed_refs = 2; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 827 | } |
Chris Mason | bb72170 | 2013-01-29 18:44:12 -0500 | [diff] [blame] | 828 | |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 829 | btrfs_trans_release_metadata(trans, root); |
| 830 | trans->block_rsv = NULL; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 831 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 832 | if (!list_empty(&trans->new_bgs)) |
| 833 | btrfs_create_pending_block_groups(trans, root); |
| 834 | |
Filipe Manana | 4fbcdf6 | 2015-05-20 14:01:54 +0100 | [diff] [blame] | 835 | btrfs_trans_release_chunk_metadata(trans); |
| 836 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 837 | if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 838 | should_end_transaction(trans, root) && |
| 839 | ACCESS_ONCE(cur_trans->state) == TRANS_STATE_RUNNING) { |
| 840 | spin_lock(&info->trans_lock); |
| 841 | if (cur_trans->state == TRANS_STATE_RUNNING) |
| 842 | cur_trans->state = TRANS_STATE_BLOCKED; |
| 843 | spin_unlock(&info->trans_lock); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 844 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 845 | |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 846 | if (lock && ACCESS_ONCE(cur_trans->state) == TRANS_STATE_BLOCKED) { |
Josef Bacik | 3bbb24b | 2014-03-06 19:01:07 -0500 | [diff] [blame] | 847 | if (throttle) |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 848 | return btrfs_commit_transaction(trans, root); |
Josef Bacik | 3bbb24b | 2014-03-06 19:01:07 -0500 | [diff] [blame] | 849 | else |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 850 | wake_up_process(info->transaction_kthread); |
| 851 | } |
| 852 | |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 853 | if (trans->type & __TRANS_FREEZABLE) |
Josef Bacik | 9811465 | 2012-09-14 11:22:38 -0400 | [diff] [blame] | 854 | sb_end_intwrite(root->fs_info->sb); |
Josef Bacik | 6df7881 | 2012-09-05 08:08:30 -0600 | [diff] [blame] | 855 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 856 | WARN_ON(cur_trans != info->running_transaction); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 857 | WARN_ON(atomic_read(&cur_trans->num_writers) < 1); |
| 858 | atomic_dec(&cur_trans->num_writers); |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 859 | extwriter_counter_dec(cur_trans, trans->type); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 860 | |
David Sterba | a83342a | 2015-02-16 19:36:47 +0100 | [diff] [blame] | 861 | /* |
| 862 | * Make sure counter is updated before we wake up waiters. |
| 863 | */ |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 864 | smp_mb(); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 865 | if (waitqueue_active(&cur_trans->writer_wait)) |
| 866 | wake_up(&cur_trans->writer_wait); |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 867 | btrfs_put_transaction(cur_trans); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 868 | |
| 869 | if (current->journal_info == trans) |
| 870 | current->journal_info = NULL; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 871 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 872 | if (throttle) |
| 873 | btrfs_run_delayed_iputs(root); |
| 874 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 875 | if (trans->aborted || |
Josef Bacik | 4e121c0 | 2013-09-27 16:32:39 -0400 | [diff] [blame] | 876 | test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
| 877 | wake_up_process(info->transaction_kthread); |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 878 | err = -EIO; |
Josef Bacik | 4e121c0 | 2013-09-27 16:32:39 -0400 | [diff] [blame] | 879 | } |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 880 | assert_qgroups_uptodate(trans); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 881 | |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 882 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Chris Mason | a79b7d4 | 2014-05-22 16:18:52 -0700 | [diff] [blame] | 883 | if (must_run_delayed_refs) { |
| 884 | btrfs_async_run_delayed_refs(root, cur, |
| 885 | must_run_delayed_refs == 1); |
| 886 | } |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 887 | return err; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 888 | } |
| 889 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 890 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 891 | struct btrfs_root *root) |
| 892 | { |
Wang Shilong | 98ad43be | 2013-04-14 14:08:49 +0000 | [diff] [blame] | 893 | return __btrfs_end_transaction(trans, root, 0); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, |
| 897 | struct btrfs_root *root) |
| 898 | { |
Wang Shilong | 98ad43be | 2013-04-14 14:08:49 +0000 | [diff] [blame] | 899 | return __btrfs_end_transaction(trans, root, 1); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 900 | } |
| 901 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 902 | /* |
| 903 | * when btree blocks are allocated, they have some corresponding bits set for |
| 904 | * them in one of two extent_io trees. This is used to make sure all of |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 905 | * those extents are sent to disk but does not wait on them |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 906 | */ |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 907 | int btrfs_write_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 908 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 909 | { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 910 | int err = 0; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 911 | int werr = 0; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 912 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 913 | struct extent_state *cached_state = NULL; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 914 | u64 start = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 915 | u64 end; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 916 | |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 917 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 918 | mark, &cached_state)) { |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 919 | bool wait_writeback = false; |
| 920 | |
| 921 | err = convert_extent_bit(dirty_pages, start, end, |
| 922 | EXTENT_NEED_WAIT, |
| 923 | mark, &cached_state, GFP_NOFS); |
| 924 | /* |
| 925 | * convert_extent_bit can return -ENOMEM, which is most of the |
| 926 | * time a temporary error. So when it happens, ignore the error |
| 927 | * and wait for writeback of this range to finish - because we |
| 928 | * failed to set the bit EXTENT_NEED_WAIT for the range, a call |
| 929 | * to btrfs_wait_marked_extents() would not know that writeback |
| 930 | * for this range started and therefore wouldn't wait for it to |
| 931 | * finish - we don't want to commit a superblock that points to |
| 932 | * btree nodes/leafs for which writeback hasn't finished yet |
| 933 | * (and without errors). |
| 934 | * We cleanup any entries left in the io tree when committing |
| 935 | * the transaction (through clear_btree_io_tree()). |
| 936 | */ |
| 937 | if (err == -ENOMEM) { |
| 938 | err = 0; |
| 939 | wait_writeback = true; |
| 940 | } |
| 941 | if (!err) |
| 942 | err = filemap_fdatawrite_range(mapping, start, end); |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 943 | if (err) |
| 944 | werr = err; |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 945 | else if (wait_writeback) |
| 946 | werr = filemap_fdatawait_range(mapping, start, end); |
Filipe Manana | e38e2ed | 2014-10-13 12:28:38 +0100 | [diff] [blame] | 947 | free_extent_state(cached_state); |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 948 | cached_state = NULL; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 949 | cond_resched(); |
| 950 | start = end + 1; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 951 | } |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 952 | return werr; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * when btree blocks are allocated, they have some corresponding bits set for |
| 957 | * them in one of two extent_io trees. This is used to make sure all of |
| 958 | * those extents are on disk for transaction or log commit. We wait |
| 959 | * on all the pages and clear them from the dirty pages state tree |
| 960 | */ |
| 961 | int btrfs_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 962 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 963 | { |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 964 | int err = 0; |
| 965 | int werr = 0; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 966 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 967 | struct extent_state *cached_state = NULL; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 968 | u64 start = 0; |
| 969 | u64 end; |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 970 | struct btrfs_inode *btree_ino = BTRFS_I(root->fs_info->btree_inode); |
| 971 | bool errors = false; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 972 | |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 973 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 974 | EXTENT_NEED_WAIT, &cached_state)) { |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 975 | /* |
| 976 | * Ignore -ENOMEM errors returned by clear_extent_bit(). |
| 977 | * When committing the transaction, we'll remove any entries |
| 978 | * left in the io tree. For a log commit, we don't remove them |
| 979 | * after committing the log because the tree can be accessed |
| 980 | * concurrently - we do it only at transaction commit time when |
| 981 | * it's safe to do it (through clear_btree_io_tree()). |
| 982 | */ |
| 983 | err = clear_extent_bit(dirty_pages, start, end, |
| 984 | EXTENT_NEED_WAIT, |
| 985 | 0, 0, &cached_state, GFP_NOFS); |
| 986 | if (err == -ENOMEM) |
| 987 | err = 0; |
| 988 | if (!err) |
| 989 | err = filemap_fdatawait_range(mapping, start, end); |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 990 | if (err) |
| 991 | werr = err; |
Filipe Manana | e38e2ed | 2014-10-13 12:28:38 +0100 | [diff] [blame] | 992 | free_extent_state(cached_state); |
| 993 | cached_state = NULL; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 994 | cond_resched(); |
| 995 | start = end + 1; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 996 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 997 | if (err) |
| 998 | werr = err; |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 999 | |
| 1000 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
| 1001 | if ((mark & EXTENT_DIRTY) && |
| 1002 | test_and_clear_bit(BTRFS_INODE_BTREE_LOG1_ERR, |
| 1003 | &btree_ino->runtime_flags)) |
| 1004 | errors = true; |
| 1005 | |
| 1006 | if ((mark & EXTENT_NEW) && |
| 1007 | test_and_clear_bit(BTRFS_INODE_BTREE_LOG2_ERR, |
| 1008 | &btree_ino->runtime_flags)) |
| 1009 | errors = true; |
| 1010 | } else { |
| 1011 | if (test_and_clear_bit(BTRFS_INODE_BTREE_ERR, |
| 1012 | &btree_ino->runtime_flags)) |
| 1013 | errors = true; |
| 1014 | } |
| 1015 | |
| 1016 | if (errors && !werr) |
| 1017 | werr = -EIO; |
| 1018 | |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 1019 | return werr; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1020 | } |
| 1021 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 1022 | /* |
| 1023 | * when btree blocks are allocated, they have some corresponding bits set for |
| 1024 | * them in one of two extent_io trees. This is used to make sure all of |
| 1025 | * those extents are on disk for transaction or log commit |
| 1026 | */ |
Sergei Trofimovich | 171170c | 2013-08-14 23:27:46 +0300 | [diff] [blame] | 1027 | static int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 1028 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 1029 | { |
| 1030 | int ret; |
| 1031 | int ret2; |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 1032 | struct blk_plug plug; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 1033 | |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 1034 | blk_start_plug(&plug); |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 1035 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 1036 | blk_finish_plug(&plug); |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 1037 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
Chris Mason | bf0da8c | 2011-11-04 12:29:37 -0400 | [diff] [blame] | 1038 | |
| 1039 | if (ret) |
| 1040 | return ret; |
| 1041 | if (ret2) |
| 1042 | return ret2; |
| 1043 | return 0; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 1044 | } |
| 1045 | |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 1046 | static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 1047 | struct btrfs_root *root) |
| 1048 | { |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 1049 | int ret; |
| 1050 | |
| 1051 | ret = btrfs_write_and_wait_marked_extents(root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 1052 | &trans->transaction->dirty_pages, |
| 1053 | EXTENT_DIRTY); |
Filipe Manana | 663dfbb | 2014-10-13 12:28:37 +0100 | [diff] [blame] | 1054 | clear_btree_io_tree(&trans->transaction->dirty_pages); |
| 1055 | |
| 1056 | return ret; |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 1057 | } |
| 1058 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1059 | /* |
| 1060 | * this is used to update the root pointer in the tree of tree roots. |
| 1061 | * |
| 1062 | * But, in the case of the extent allocation tree, updating the root |
| 1063 | * pointer may allocate blocks which may change the root of the extent |
| 1064 | * allocation tree. |
| 1065 | * |
| 1066 | * So, this loops and repeats and makes sure the cowonly root didn't |
| 1067 | * change while the root pointer was being updated in the metadata. |
| 1068 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1069 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
| 1070 | struct btrfs_root *root) |
| 1071 | { |
| 1072 | int ret; |
| 1073 | u64 old_root_bytenr; |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 1074 | u64 old_root_used; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1075 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 1076 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 1077 | old_root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1078 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1079 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1080 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 1081 | if (old_root_bytenr == root->node->start && |
Josef Bacik | ea526d1 | 2015-03-13 16:40:45 -0400 | [diff] [blame] | 1082 | old_root_used == btrfs_root_used(&root->root_item)) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1083 | break; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1084 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1085 | btrfs_set_root_node(&root->root_item, root->node); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1086 | ret = btrfs_update_root(trans, tree_root, |
| 1087 | &root->root_key, |
| 1088 | &root->root_item); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1089 | if (ret) |
| 1090 | return ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1091 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 1092 | old_root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1093 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 1094 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1095 | return 0; |
| 1096 | } |
| 1097 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1098 | /* |
| 1099 | * update all the cowonly tree roots on disk |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1100 | * |
| 1101 | * The error handling in this function may not be obvious. Any of the |
| 1102 | * failures will cause the file system to go offline. We still need |
| 1103 | * to clean up the delayed refs. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1104 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1105 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
| 1106 | struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1107 | { |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1108 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | ea526d1 | 2015-03-13 16:40:45 -0400 | [diff] [blame] | 1109 | struct list_head *dirty_bgs = &trans->transaction->dirty_bgs; |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1110 | struct list_head *io_bgs = &trans->transaction->io_bgs; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1111 | struct list_head *next; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1112 | struct extent_buffer *eb; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1113 | int ret; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1114 | |
| 1115 | eb = btrfs_lock_root_node(fs_info->tree_root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1116 | ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, |
| 1117 | 0, &eb); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1118 | btrfs_tree_unlock(eb); |
| 1119 | free_extent_buffer(eb); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1120 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1121 | if (ret) |
| 1122 | return ret; |
| 1123 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1124 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1125 | if (ret) |
| 1126 | return ret; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1127 | |
Stefan Behrens | 733f4fb | 2012-05-25 16:06:10 +0200 | [diff] [blame] | 1128 | ret = btrfs_run_dev_stats(trans, root->fs_info); |
Josef Bacik | c16ce19 | 2013-09-27 16:38:20 -0400 | [diff] [blame] | 1129 | if (ret) |
| 1130 | return ret; |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1131 | ret = btrfs_run_dev_replace(trans, root->fs_info); |
Josef Bacik | c16ce19 | 2013-09-27 16:38:20 -0400 | [diff] [blame] | 1132 | if (ret) |
| 1133 | return ret; |
Jan Schmidt | 546adb0 | 2012-06-14 16:37:44 +0200 | [diff] [blame] | 1134 | ret = btrfs_run_qgroups(trans, root->fs_info); |
Josef Bacik | c16ce19 | 2013-09-27 16:38:20 -0400 | [diff] [blame] | 1135 | if (ret) |
| 1136 | return ret; |
Jan Schmidt | 546adb0 | 2012-06-14 16:37:44 +0200 | [diff] [blame] | 1137 | |
Josef Bacik | dcdf7f6 | 2015-03-02 16:37:31 -0500 | [diff] [blame] | 1138 | ret = btrfs_setup_space_cache(trans, root); |
| 1139 | if (ret) |
| 1140 | return ret; |
| 1141 | |
Jan Schmidt | 546adb0 | 2012-06-14 16:37:44 +0200 | [diff] [blame] | 1142 | /* run_qgroups might have added some more refs */ |
| 1143 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Josef Bacik | c16ce19 | 2013-09-27 16:38:20 -0400 | [diff] [blame] | 1144 | if (ret) |
| 1145 | return ret; |
Josef Bacik | ea526d1 | 2015-03-13 16:40:45 -0400 | [diff] [blame] | 1146 | again: |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1147 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1148 | next = fs_info->dirty_cowonly_roots.next; |
| 1149 | list_del_init(next); |
| 1150 | root = list_entry(next, struct btrfs_root, dirty_list); |
Josef Bacik | e7070be | 2014-12-16 08:54:43 -0800 | [diff] [blame] | 1151 | clear_bit(BTRFS_ROOT_DIRTY, &root->state); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1152 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 1153 | if (root != fs_info->extent_root) |
| 1154 | list_add_tail(&root->dirty_list, |
| 1155 | &trans->transaction->switch_commits); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1156 | ret = update_cowonly_root(trans, root); |
| 1157 | if (ret) |
| 1158 | return ret; |
Josef Bacik | ea526d1 | 2015-03-13 16:40:45 -0400 | [diff] [blame] | 1159 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 1160 | if (ret) |
| 1161 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1162 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 1163 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1164 | while (!list_empty(dirty_bgs) || !list_empty(io_bgs)) { |
Josef Bacik | ea526d1 | 2015-03-13 16:40:45 -0400 | [diff] [blame] | 1165 | ret = btrfs_write_dirty_block_groups(trans, root); |
| 1166 | if (ret) |
| 1167 | return ret; |
| 1168 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 1169 | if (ret) |
| 1170 | return ret; |
| 1171 | } |
| 1172 | |
| 1173 | if (!list_empty(&fs_info->dirty_cowonly_roots)) |
| 1174 | goto again; |
| 1175 | |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 1176 | list_add_tail(&fs_info->extent_root->dirty_list, |
| 1177 | &trans->transaction->switch_commits); |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1178 | btrfs_after_dev_replace_commit(fs_info); |
| 1179 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1180 | return 0; |
| 1181 | } |
| 1182 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1183 | /* |
| 1184 | * dead roots are old snapshots that need to be deleted. This allocates |
| 1185 | * a dirty root struct and adds it into the list of dead roots that need to |
| 1186 | * be deleted |
| 1187 | */ |
Josef Bacik | cfad392 | 2013-07-25 15:11:47 -0400 | [diff] [blame] | 1188 | void btrfs_add_dead_root(struct btrfs_root *root) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1189 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1190 | spin_lock(&root->fs_info->trans_lock); |
Josef Bacik | cfad392 | 2013-07-25 15:11:47 -0400 | [diff] [blame] | 1191 | if (list_empty(&root->root_list)) |
| 1192 | list_add_tail(&root->root_list, &root->fs_info->dead_roots); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1193 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1194 | } |
| 1195 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1196 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1197 | * update all the cowonly tree roots on disk |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1198 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1199 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
| 1200 | struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1201 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1202 | struct btrfs_root *gang[8]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1203 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1204 | int i; |
| 1205 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1206 | int err = 0; |
| 1207 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1208 | spin_lock(&fs_info->fs_roots_radix_lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1209 | while (1) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1210 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
| 1211 | (void **)gang, 0, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1212 | ARRAY_SIZE(gang), |
| 1213 | BTRFS_ROOT_TRANS_TAG); |
| 1214 | if (ret == 0) |
| 1215 | break; |
| 1216 | for (i = 0; i < ret; i++) { |
| 1217 | root = gang[i]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1218 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
| 1219 | (unsigned long)root->root_key.objectid, |
| 1220 | BTRFS_ROOT_TRANS_TAG); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1221 | spin_unlock(&fs_info->fs_roots_radix_lock); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1222 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1223 | btrfs_free_log(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1224 | btrfs_update_reloc_root(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1225 | btrfs_orphan_commit_root(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1226 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1227 | btrfs_save_ino_cache(root, trans); |
| 1228 | |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 1229 | /* see comments in should_cow_block() */ |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 1230 | clear_bit(BTRFS_ROOT_FORCE_COW, &root->state); |
Chris Mason | c7548af | 2014-06-10 13:06:56 -0700 | [diff] [blame] | 1231 | smp_mb__after_atomic(); |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 1232 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 1233 | if (root->commit_root != root->node) { |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 1234 | list_add_tail(&root->dirty_list, |
| 1235 | &trans->transaction->switch_commits); |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 1236 | btrfs_set_root_node(&root->root_item, |
| 1237 | root->node); |
| 1238 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 1239 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1240 | err = btrfs_update_root(trans, fs_info->tree_root, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1241 | &root->root_key, |
| 1242 | &root->root_item); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1243 | spin_lock(&fs_info->fs_roots_radix_lock); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1244 | if (err) |
| 1245 | break; |
Qu Wenruo | 7174109 | 2015-09-08 17:22:41 +0800 | [diff] [blame] | 1246 | btrfs_qgroup_free_meta_all(root); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1247 | } |
| 1248 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1249 | spin_unlock(&fs_info->fs_roots_radix_lock); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1250 | return err; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 1251 | } |
| 1252 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1253 | /* |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 1254 | * defrag a given btree. |
| 1255 | * Every leaf in the btree is read and defragged. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1256 | */ |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 1257 | int btrfs_defrag_root(struct btrfs_root *root) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1258 | { |
| 1259 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1260 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1261 | int ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1262 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 1263 | if (test_and_set_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state)) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1264 | return 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1265 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 1266 | while (1) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1267 | trans = btrfs_start_transaction(root, 0); |
| 1268 | if (IS_ERR(trans)) |
| 1269 | return PTR_ERR(trans); |
| 1270 | |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 1271 | ret = btrfs_defrag_leaves(trans, root); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1272 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1273 | btrfs_end_transaction(trans, root); |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 1274 | btrfs_btree_balance_dirty(info->tree_root); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1275 | cond_resched(); |
| 1276 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 1277 | if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1278 | break; |
David Sterba | 210549e | 2013-02-09 23:38:06 +0000 | [diff] [blame] | 1279 | |
| 1280 | if (btrfs_defrag_cancelled(root->fs_info)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1281 | pr_debug("BTRFS: defrag_root cancelled\n"); |
David Sterba | 210549e | 2013-02-09 23:38:06 +0000 | [diff] [blame] | 1282 | ret = -EAGAIN; |
| 1283 | break; |
| 1284 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1285 | } |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 1286 | clear_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1287 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1288 | } |
| 1289 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1290 | /* |
| 1291 | * new snapshots need to be created at a very specific time in the |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1292 | * transaction commit. This does the actual creation. |
| 1293 | * |
| 1294 | * Note: |
| 1295 | * If the error which may affect the commitment of the current transaction |
| 1296 | * happens, we should return the error number. If the error which just affect |
| 1297 | * the creation of the pending snapshots, just return 0. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1298 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1299 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1300 | struct btrfs_fs_info *fs_info, |
| 1301 | struct btrfs_pending_snapshot *pending) |
| 1302 | { |
| 1303 | struct btrfs_key key; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1304 | struct btrfs_root_item *new_root_item; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1305 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 1306 | struct btrfs_root *root = pending->root; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1307 | struct btrfs_root *parent_root; |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1308 | struct btrfs_block_rsv *rsv; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1309 | struct inode *parent_inode; |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1310 | struct btrfs_path *path; |
| 1311 | struct btrfs_dir_item *dir_item; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1312 | struct dentry *dentry; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1313 | struct extent_buffer *tmp; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1314 | struct extent_buffer *old; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 1315 | struct timespec cur_time = CURRENT_TIME; |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1316 | int ret = 0; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1317 | u64 to_reserve = 0; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1318 | u64 index = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1319 | u64 objectid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1320 | u64 root_flags; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 1321 | uuid_le new_uuid; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1322 | |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1323 | path = btrfs_alloc_path(); |
| 1324 | if (!path) { |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1325 | pending->error = -ENOMEM; |
| 1326 | return 0; |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1327 | } |
| 1328 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1329 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
| 1330 | if (!new_root_item) { |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1331 | pending->error = -ENOMEM; |
Miao Xie | 6fa9700 | 2012-09-06 04:00:32 -0600 | [diff] [blame] | 1332 | goto root_item_alloc_fail; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1333 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1334 | |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1335 | pending->error = btrfs_find_free_objectid(tree_root, &objectid); |
| 1336 | if (pending->error) |
Miao Xie | 6fa9700 | 2012-09-06 04:00:32 -0600 | [diff] [blame] | 1337 | goto no_free_objectid; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1338 | |
Qu Wenruo | d672633 | 2015-04-20 10:09:06 +0800 | [diff] [blame] | 1339 | /* |
| 1340 | * Make qgroup to skip current new snapshot's qgroupid, as it is |
| 1341 | * accounted by later btrfs_qgroup_inherit(). |
| 1342 | */ |
| 1343 | btrfs_set_skip_qgroup(trans, objectid); |
| 1344 | |
Zhaolei | 147d256 | 2015-08-06 20:58:11 +0800 | [diff] [blame] | 1345 | btrfs_reloc_pre_snapshot(pending, &to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1346 | |
| 1347 | if (to_reserve > 0) { |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1348 | pending->error = btrfs_block_rsv_add(root, |
| 1349 | &pending->block_rsv, |
| 1350 | to_reserve, |
| 1351 | BTRFS_RESERVE_NO_FLUSH); |
| 1352 | if (pending->error) |
Qu Wenruo | d672633 | 2015-04-20 10:09:06 +0800 | [diff] [blame] | 1353 | goto clear_skip_qgroup; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1354 | } |
| 1355 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1356 | key.objectid = objectid; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1357 | key.offset = (u64)-1; |
| 1358 | key.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1359 | |
Miao Xie | 6fa9700 | 2012-09-06 04:00:32 -0600 | [diff] [blame] | 1360 | rsv = trans->block_rsv; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1361 | trans->block_rsv = &pending->block_rsv; |
Liu Bo | 2382c5c | 2013-02-22 04:33:36 +0000 | [diff] [blame] | 1362 | trans->bytes_reserved = trans->block_rsv->reserved; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1363 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1364 | dentry = pending->dentry; |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 1365 | parent_inode = pending->dir; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1366 | parent_root = BTRFS_I(parent_inode)->root; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1367 | record_root_in_trans(trans, parent_root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1368 | |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1369 | /* |
| 1370 | * insert the directory item |
| 1371 | */ |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1372 | ret = btrfs_set_inode_index(parent_inode, &index); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1373 | BUG_ON(ret); /* -ENOMEM */ |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1374 | |
| 1375 | /* check if there is a file/dir which has the same name. */ |
| 1376 | dir_item = btrfs_lookup_dir_item(NULL, parent_root, path, |
| 1377 | btrfs_ino(parent_inode), |
| 1378 | dentry->d_name.name, |
| 1379 | dentry->d_name.len, 0); |
| 1380 | if (dir_item != NULL && !IS_ERR(dir_item)) { |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 1381 | pending->error = -EEXIST; |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1382 | goto dir_item_existed; |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1383 | } else if (IS_ERR(dir_item)) { |
| 1384 | ret = PTR_ERR(dir_item); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1385 | btrfs_abort_transaction(trans, root, ret); |
| 1386 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1387 | } |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1388 | btrfs_release_path(path); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1389 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1390 | /* |
| 1391 | * pull in the delayed directory update |
| 1392 | * and the delayed inode item |
| 1393 | * otherwise we corrupt the FS during |
| 1394 | * snapshot |
| 1395 | */ |
| 1396 | ret = btrfs_run_delayed_items(trans, root); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1397 | if (ret) { /* Transaction aborted */ |
| 1398 | btrfs_abort_transaction(trans, root, ret); |
| 1399 | goto fail; |
| 1400 | } |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1401 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1402 | record_root_in_trans(trans, root); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1403 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
| 1404 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 1405 | btrfs_check_and_init_root_item(new_root_item); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1406 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1407 | root_flags = btrfs_root_flags(new_root_item); |
| 1408 | if (pending->readonly) |
| 1409 | root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; |
| 1410 | else |
| 1411 | root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; |
| 1412 | btrfs_set_root_flags(new_root_item, root_flags); |
| 1413 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 1414 | btrfs_set_root_generation_v2(new_root_item, |
| 1415 | trans->transid); |
| 1416 | uuid_le_gen(&new_uuid); |
| 1417 | memcpy(new_root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); |
| 1418 | memcpy(new_root_item->parent_uuid, root->root_item.uuid, |
| 1419 | BTRFS_UUID_SIZE); |
Stefan Behrens | 70023da | 2013-04-17 09:11:47 +0000 | [diff] [blame] | 1420 | if (!(root_flags & BTRFS_ROOT_SUBVOL_RDONLY)) { |
| 1421 | memset(new_root_item->received_uuid, 0, |
| 1422 | sizeof(new_root_item->received_uuid)); |
| 1423 | memset(&new_root_item->stime, 0, sizeof(new_root_item->stime)); |
| 1424 | memset(&new_root_item->rtime, 0, sizeof(new_root_item->rtime)); |
| 1425 | btrfs_set_root_stransid(new_root_item, 0); |
| 1426 | btrfs_set_root_rtransid(new_root_item, 0); |
| 1427 | } |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 1428 | btrfs_set_stack_timespec_sec(&new_root_item->otime, cur_time.tv_sec); |
| 1429 | btrfs_set_stack_timespec_nsec(&new_root_item->otime, cur_time.tv_nsec); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 1430 | btrfs_set_root_otransid(new_root_item, trans->transid); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 1431 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1432 | old = btrfs_lock_root_node(root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1433 | ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1434 | if (ret) { |
| 1435 | btrfs_tree_unlock(old); |
| 1436 | free_extent_buffer(old); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1437 | btrfs_abort_transaction(trans, root, ret); |
| 1438 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1439 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1440 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1441 | btrfs_set_lock_blocking(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1442 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1443 | ret = btrfs_copy_root(trans, root, old, &tmp, objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1444 | /* clean up in any case */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1445 | btrfs_tree_unlock(old); |
| 1446 | free_extent_buffer(old); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1447 | if (ret) { |
| 1448 | btrfs_abort_transaction(trans, root, ret); |
| 1449 | goto fail; |
| 1450 | } |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 1451 | /* see comments in should_cow_block() */ |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 1452 | set_bit(BTRFS_ROOT_FORCE_COW, &root->state); |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 1453 | smp_wmb(); |
| 1454 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1455 | btrfs_set_root_node(new_root_item, tmp); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1456 | /* record when the snapshot was created in key.offset */ |
| 1457 | key.offset = trans->transid; |
| 1458 | ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1459 | btrfs_tree_unlock(tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1460 | free_extent_buffer(tmp); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1461 | if (ret) { |
| 1462 | btrfs_abort_transaction(trans, root, ret); |
| 1463 | goto fail; |
| 1464 | } |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 1465 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1466 | /* |
| 1467 | * insert root back/forward references |
| 1468 | */ |
| 1469 | ret = btrfs_add_root_ref(trans, tree_root, objectid, |
| 1470 | parent_root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1471 | btrfs_ino(parent_inode), index, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1472 | dentry->d_name.name, dentry->d_name.len); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1473 | if (ret) { |
| 1474 | btrfs_abort_transaction(trans, root, ret); |
| 1475 | goto fail; |
| 1476 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1477 | |
| 1478 | key.offset = (u64)-1; |
| 1479 | pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1480 | if (IS_ERR(pending->snap)) { |
| 1481 | ret = PTR_ERR(pending->snap); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1482 | btrfs_abort_transaction(trans, root, ret); |
| 1483 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1484 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1485 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1486 | ret = btrfs_reloc_post_snapshot(trans, pending); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1487 | if (ret) { |
| 1488 | btrfs_abort_transaction(trans, root, ret); |
| 1489 | goto fail; |
| 1490 | } |
Miao Xie | 361048f | 2012-09-06 04:00:57 -0600 | [diff] [blame] | 1491 | |
| 1492 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1493 | if (ret) { |
| 1494 | btrfs_abort_transaction(trans, root, ret); |
| 1495 | goto fail; |
| 1496 | } |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1497 | |
| 1498 | ret = btrfs_insert_dir_item(trans, parent_root, |
| 1499 | dentry->d_name.name, dentry->d_name.len, |
| 1500 | parent_inode, &key, |
| 1501 | BTRFS_FT_DIR, index); |
| 1502 | /* We have check then name at the beginning, so it is impossible. */ |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 1503 | BUG_ON(ret == -EEXIST || ret == -EOVERFLOW); |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1504 | if (ret) { |
| 1505 | btrfs_abort_transaction(trans, root, ret); |
| 1506 | goto fail; |
| 1507 | } |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1508 | |
| 1509 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
| 1510 | dentry->d_name.len * 2); |
| 1511 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
Josef Bacik | be6aef6 | 2012-10-22 15:43:12 -0400 | [diff] [blame] | 1512 | ret = btrfs_update_inode_fallback(trans, parent_root, parent_inode); |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 1513 | if (ret) { |
Miao Xie | 8732d44 | 2012-09-17 23:52:38 -0600 | [diff] [blame] | 1514 | btrfs_abort_transaction(trans, root, ret); |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 1515 | goto fail; |
| 1516 | } |
| 1517 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, new_uuid.b, |
| 1518 | BTRFS_UUID_KEY_SUBVOL, objectid); |
| 1519 | if (ret) { |
| 1520 | btrfs_abort_transaction(trans, root, ret); |
| 1521 | goto fail; |
| 1522 | } |
| 1523 | if (!btrfs_is_empty_uuid(new_root_item->received_uuid)) { |
| 1524 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, |
| 1525 | new_root_item->received_uuid, |
| 1526 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 1527 | objectid); |
| 1528 | if (ret && ret != -EEXIST) { |
| 1529 | btrfs_abort_transaction(trans, root, ret); |
| 1530 | goto fail; |
| 1531 | } |
| 1532 | } |
Qu Wenruo | d672633 | 2015-04-20 10:09:06 +0800 | [diff] [blame] | 1533 | |
| 1534 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 1535 | if (ret) { |
| 1536 | btrfs_abort_transaction(trans, root, ret); |
| 1537 | goto fail; |
| 1538 | } |
| 1539 | |
| 1540 | /* |
| 1541 | * account qgroup counters before qgroup_inherit() |
| 1542 | */ |
| 1543 | ret = btrfs_qgroup_prepare_account_extents(trans, fs_info); |
| 1544 | if (ret) |
| 1545 | goto fail; |
| 1546 | ret = btrfs_qgroup_account_extents(trans, fs_info); |
| 1547 | if (ret) |
| 1548 | goto fail; |
| 1549 | ret = btrfs_qgroup_inherit(trans, fs_info, |
| 1550 | root->root_key.objectid, |
| 1551 | objectid, pending->inherit); |
| 1552 | if (ret) { |
| 1553 | btrfs_abort_transaction(trans, root, ret); |
| 1554 | goto fail; |
| 1555 | } |
| 1556 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1557 | fail: |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1558 | pending->error = ret; |
| 1559 | dir_item_existed: |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1560 | trans->block_rsv = rsv; |
Liu Bo | 2382c5c | 2013-02-22 04:33:36 +0000 | [diff] [blame] | 1561 | trans->bytes_reserved = 0; |
Qu Wenruo | d672633 | 2015-04-20 10:09:06 +0800 | [diff] [blame] | 1562 | clear_skip_qgroup: |
| 1563 | btrfs_clear_skip_qgroup(trans); |
Miao Xie | 6fa9700 | 2012-09-06 04:00:32 -0600 | [diff] [blame] | 1564 | no_free_objectid: |
| 1565 | kfree(new_root_item); |
| 1566 | root_item_alloc_fail: |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1567 | btrfs_free_path(path); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1568 | return ret; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1569 | } |
| 1570 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1571 | /* |
| 1572 | * create all the snapshots we've scheduled for creation |
| 1573 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1574 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
| 1575 | struct btrfs_fs_info *fs_info) |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1576 | { |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1577 | struct btrfs_pending_snapshot *pending, *next; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1578 | struct list_head *head = &trans->transaction->pending_snapshots; |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1579 | int ret = 0; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1580 | |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 1581 | list_for_each_entry_safe(pending, next, head, list) { |
| 1582 | list_del(&pending->list); |
| 1583 | ret = create_pending_snapshot(trans, fs_info, pending); |
| 1584 | if (ret) |
| 1585 | break; |
| 1586 | } |
| 1587 | return ret; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1588 | } |
| 1589 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1590 | static void update_super_roots(struct btrfs_root *root) |
| 1591 | { |
| 1592 | struct btrfs_root_item *root_item; |
| 1593 | struct btrfs_super_block *super; |
| 1594 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1595 | super = root->fs_info->super_copy; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1596 | |
| 1597 | root_item = &root->fs_info->chunk_root->root_item; |
| 1598 | super->chunk_root = root_item->bytenr; |
| 1599 | super->chunk_root_generation = root_item->generation; |
| 1600 | super->chunk_root_level = root_item->level; |
| 1601 | |
| 1602 | root_item = &root->fs_info->tree_root->root_item; |
| 1603 | super->root = root_item->bytenr; |
| 1604 | super->generation = root_item->generation; |
| 1605 | super->root_level = root_item->level; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 1606 | if (btrfs_test_opt(root, SPACE_CACHE)) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 1607 | super->cache_generation = root_item->generation; |
Stefan Behrens | 70f8017 | 2013-08-15 17:11:23 +0200 | [diff] [blame] | 1608 | if (root->fs_info->update_uuid_tree_gen) |
| 1609 | super->uuid_tree_generation = root_item->generation; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1610 | } |
| 1611 | |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1612 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
| 1613 | { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1614 | struct btrfs_transaction *trans; |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1615 | int ret = 0; |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1616 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1617 | spin_lock(&info->trans_lock); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1618 | trans = info->running_transaction; |
| 1619 | if (trans) |
| 1620 | ret = (trans->state >= TRANS_STATE_COMMIT_START); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1621 | spin_unlock(&info->trans_lock); |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1622 | return ret; |
| 1623 | } |
| 1624 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1625 | int btrfs_transaction_blocked(struct btrfs_fs_info *info) |
| 1626 | { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1627 | struct btrfs_transaction *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1628 | int ret = 0; |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1629 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1630 | spin_lock(&info->trans_lock); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1631 | trans = info->running_transaction; |
| 1632 | if (trans) |
| 1633 | ret = is_transaction_blocked(trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1634 | spin_unlock(&info->trans_lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1635 | return ret; |
| 1636 | } |
| 1637 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1638 | /* |
| 1639 | * wait for the current transaction commit to start and block subsequent |
| 1640 | * transaction joins |
| 1641 | */ |
| 1642 | static void wait_current_trans_commit_start(struct btrfs_root *root, |
| 1643 | struct btrfs_transaction *trans) |
| 1644 | { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1645 | wait_event(root->fs_info->transaction_blocked_wait, |
Josef Bacik | 501407a | 2013-06-10 16:47:23 -0400 | [diff] [blame] | 1646 | trans->state >= TRANS_STATE_COMMIT_START || |
| 1647 | trans->aborted); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1648 | } |
| 1649 | |
| 1650 | /* |
| 1651 | * wait for the current transaction to start and then become unblocked. |
| 1652 | * caller holds ref. |
| 1653 | */ |
| 1654 | static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, |
| 1655 | struct btrfs_transaction *trans) |
| 1656 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 1657 | wait_event(root->fs_info->transaction_wait, |
Josef Bacik | 501407a | 2013-06-10 16:47:23 -0400 | [diff] [blame] | 1658 | trans->state >= TRANS_STATE_UNBLOCKED || |
| 1659 | trans->aborted); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1660 | } |
| 1661 | |
| 1662 | /* |
| 1663 | * commit transactions asynchronously. once btrfs_commit_transaction_async |
| 1664 | * returns, any subsequent transaction will not be allowed to join. |
| 1665 | */ |
| 1666 | struct btrfs_async_commit { |
| 1667 | struct btrfs_trans_handle *newtrans; |
| 1668 | struct btrfs_root *root; |
Miao Xie | 7892b5a | 2012-11-15 08:14:47 +0000 | [diff] [blame] | 1669 | struct work_struct work; |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1670 | }; |
| 1671 | |
| 1672 | static void do_async_commit(struct work_struct *work) |
| 1673 | { |
| 1674 | struct btrfs_async_commit *ac = |
Miao Xie | 7892b5a | 2012-11-15 08:14:47 +0000 | [diff] [blame] | 1675 | container_of(work, struct btrfs_async_commit, work); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1676 | |
Sage Weil | 6fc4e3548 | 2012-08-30 16:26:15 -0600 | [diff] [blame] | 1677 | /* |
| 1678 | * We've got freeze protection passed with the transaction. |
| 1679 | * Tell lockdep about it. |
| 1680 | */ |
Liu Bo | b1a06a4 | 2013-11-06 16:57:55 +0800 | [diff] [blame] | 1681 | if (ac->newtrans->type & __TRANS_FREEZABLE) |
Oleg Nesterov | bee9182 | 2015-07-19 23:48:20 +0200 | [diff] [blame] | 1682 | __sb_writers_acquired(ac->root->fs_info->sb, SB_FREEZE_FS); |
Sage Weil | 6fc4e3548 | 2012-08-30 16:26:15 -0600 | [diff] [blame] | 1683 | |
Sage Weil | e209db7 | 2012-08-30 16:26:16 -0600 | [diff] [blame] | 1684 | current->journal_info = ac->newtrans; |
| 1685 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1686 | btrfs_commit_transaction(ac->newtrans, ac->root); |
| 1687 | kfree(ac); |
| 1688 | } |
| 1689 | |
| 1690 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
| 1691 | struct btrfs_root *root, |
| 1692 | int wait_for_unblock) |
| 1693 | { |
| 1694 | struct btrfs_async_commit *ac; |
| 1695 | struct btrfs_transaction *cur_trans; |
| 1696 | |
| 1697 | ac = kmalloc(sizeof(*ac), GFP_NOFS); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 1698 | if (!ac) |
| 1699 | return -ENOMEM; |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1700 | |
Miao Xie | 7892b5a | 2012-11-15 08:14:47 +0000 | [diff] [blame] | 1701 | INIT_WORK(&ac->work, do_async_commit); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1702 | ac->root = root; |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1703 | ac->newtrans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1704 | if (IS_ERR(ac->newtrans)) { |
| 1705 | int err = PTR_ERR(ac->newtrans); |
| 1706 | kfree(ac); |
| 1707 | return err; |
| 1708 | } |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1709 | |
| 1710 | /* take transaction reference */ |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1711 | cur_trans = trans->transaction; |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1712 | atomic_inc(&cur_trans->use_count); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1713 | |
| 1714 | btrfs_end_transaction(trans, root); |
Sage Weil | 6fc4e3548 | 2012-08-30 16:26:15 -0600 | [diff] [blame] | 1715 | |
| 1716 | /* |
| 1717 | * Tell lockdep we've released the freeze rwsem, since the |
| 1718 | * async commit thread will be the one to unlock it. |
| 1719 | */ |
Liu Bo | b1a06a4 | 2013-11-06 16:57:55 +0800 | [diff] [blame] | 1720 | if (ac->newtrans->type & __TRANS_FREEZABLE) |
Oleg Nesterov | bee9182 | 2015-07-19 23:48:20 +0200 | [diff] [blame] | 1721 | __sb_writers_release(root->fs_info->sb, SB_FREEZE_FS); |
Sage Weil | 6fc4e3548 | 2012-08-30 16:26:15 -0600 | [diff] [blame] | 1722 | |
Miao Xie | 7892b5a | 2012-11-15 08:14:47 +0000 | [diff] [blame] | 1723 | schedule_work(&ac->work); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1724 | |
| 1725 | /* wait for transaction to start and unblock */ |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1726 | if (wait_for_unblock) |
| 1727 | wait_current_trans_commit_start_and_unblock(root, cur_trans); |
| 1728 | else |
| 1729 | wait_current_trans_commit_start(root, cur_trans); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1730 | |
Sage Weil | 38e8805 | 2011-06-10 18:43:13 +0000 | [diff] [blame] | 1731 | if (current->journal_info == trans) |
| 1732 | current->journal_info = NULL; |
| 1733 | |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 1734 | btrfs_put_transaction(cur_trans); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1735 | return 0; |
| 1736 | } |
| 1737 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1738 | |
| 1739 | static void cleanup_transaction(struct btrfs_trans_handle *trans, |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 1740 | struct btrfs_root *root, int err) |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1741 | { |
| 1742 | struct btrfs_transaction *cur_trans = trans->transaction; |
Liu Bo | f094ac3 | 2013-02-27 13:28:25 +0000 | [diff] [blame] | 1743 | DEFINE_WAIT(wait); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1744 | |
| 1745 | WARN_ON(trans->use_count > 1); |
| 1746 | |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 1747 | btrfs_abort_transaction(trans, root, err); |
| 1748 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1749 | spin_lock(&root->fs_info->trans_lock); |
Liu Bo | 66b6135 | 2013-03-04 16:25:41 +0000 | [diff] [blame] | 1750 | |
Miao Xie | 25d8c28 | 2013-05-15 07:48:26 +0000 | [diff] [blame] | 1751 | /* |
| 1752 | * If the transaction is removed from the list, it means this |
| 1753 | * transaction has been committed successfully, so it is impossible |
| 1754 | * to call the cleanup function. |
| 1755 | */ |
| 1756 | BUG_ON(list_empty(&cur_trans->list)); |
Liu Bo | 66b6135 | 2013-03-04 16:25:41 +0000 | [diff] [blame] | 1757 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1758 | list_del_init(&cur_trans->list); |
Josef Bacik | d7096fc | 2012-05-31 15:49:57 -0400 | [diff] [blame] | 1759 | if (cur_trans == root->fs_info->running_transaction) { |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1760 | cur_trans->state = TRANS_STATE_COMMIT_DOING; |
Liu Bo | f094ac3 | 2013-02-27 13:28:25 +0000 | [diff] [blame] | 1761 | spin_unlock(&root->fs_info->trans_lock); |
| 1762 | wait_event(cur_trans->writer_wait, |
| 1763 | atomic_read(&cur_trans->num_writers) == 1); |
| 1764 | |
| 1765 | spin_lock(&root->fs_info->trans_lock); |
Josef Bacik | d7096fc | 2012-05-31 15:49:57 -0400 | [diff] [blame] | 1766 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1767 | spin_unlock(&root->fs_info->trans_lock); |
| 1768 | |
| 1769 | btrfs_cleanup_one_transaction(trans->transaction, root); |
| 1770 | |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1771 | spin_lock(&root->fs_info->trans_lock); |
| 1772 | if (cur_trans == root->fs_info->running_transaction) |
| 1773 | root->fs_info->running_transaction = NULL; |
| 1774 | spin_unlock(&root->fs_info->trans_lock); |
| 1775 | |
Josef Bacik | e022828 | 2013-09-20 22:26:29 -0400 | [diff] [blame] | 1776 | if (trans->type & __TRANS_FREEZABLE) |
| 1777 | sb_end_intwrite(root->fs_info->sb); |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 1778 | btrfs_put_transaction(cur_trans); |
| 1779 | btrfs_put_transaction(cur_trans); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1780 | |
| 1781 | trace_btrfs_transaction_commit(root); |
| 1782 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1783 | if (current->journal_info == trans) |
| 1784 | current->journal_info = NULL; |
Wang Shilong | c0af8f0 | 2014-02-19 19:24:18 +0800 | [diff] [blame] | 1785 | btrfs_scrub_cancel(root->fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1786 | |
| 1787 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
| 1788 | } |
| 1789 | |
Miao Xie | 8243661 | 2013-05-15 07:48:28 +0000 | [diff] [blame] | 1790 | static inline int btrfs_start_delalloc_flush(struct btrfs_fs_info *fs_info) |
| 1791 | { |
| 1792 | if (btrfs_test_opt(fs_info->tree_root, FLUSHONCOMMIT)) |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 1793 | return btrfs_start_delalloc_roots(fs_info, 1, -1); |
Miao Xie | 8243661 | 2013-05-15 07:48:28 +0000 | [diff] [blame] | 1794 | return 0; |
| 1795 | } |
| 1796 | |
| 1797 | static inline void btrfs_wait_delalloc_flush(struct btrfs_fs_info *fs_info) |
| 1798 | { |
| 1799 | if (btrfs_test_opt(fs_info->tree_root, FLUSHONCOMMIT)) |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 1800 | btrfs_wait_ordered_roots(fs_info, -1); |
Miao Xie | 8243661 | 2013-05-15 07:48:28 +0000 | [diff] [blame] | 1801 | } |
| 1802 | |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 1803 | static inline void |
Josef Bacik | 161c3549 | 2015-09-24 16:17:39 -0400 | [diff] [blame] | 1804 | btrfs_wait_pending_ordered(struct btrfs_transaction *cur_trans) |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 1805 | { |
Josef Bacik | 161c3549 | 2015-09-24 16:17:39 -0400 | [diff] [blame] | 1806 | wait_event(cur_trans->pending_wait, |
| 1807 | atomic_read(&cur_trans->pending_ordered) == 0); |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 1808 | } |
| 1809 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1810 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| 1811 | struct btrfs_root *root) |
| 1812 | { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1813 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1814 | struct btrfs_transaction *prev_trans = NULL; |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 1815 | struct btrfs_inode *btree_ino = BTRFS_I(root->fs_info->btree_inode); |
Miao Xie | 25287e0 | 2012-10-25 09:31:03 +0000 | [diff] [blame] | 1816 | int ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1817 | |
Miao Xie | 8d25a08 | 2013-01-15 06:27:25 +0000 | [diff] [blame] | 1818 | /* Stop the commit early if ->aborted is set */ |
| 1819 | if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { |
Miao Xie | 25287e0 | 2012-10-25 09:31:03 +0000 | [diff] [blame] | 1820 | ret = cur_trans->aborted; |
Josef Bacik | e4a2bca | 2013-02-06 16:55:41 -0500 | [diff] [blame] | 1821 | btrfs_end_transaction(trans, root); |
| 1822 | return ret; |
Miao Xie | 25287e0 | 2012-10-25 09:31:03 +0000 | [diff] [blame] | 1823 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1824 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1825 | /* make a pass through all the delayed refs we have so far |
| 1826 | * any runnings procs may add more while we are here |
| 1827 | */ |
| 1828 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Josef Bacik | e4a2bca | 2013-02-06 16:55:41 -0500 | [diff] [blame] | 1829 | if (ret) { |
| 1830 | btrfs_end_transaction(trans, root); |
| 1831 | return ret; |
| 1832 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1833 | |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 1834 | btrfs_trans_release_metadata(trans, root); |
| 1835 | trans->block_rsv = NULL; |
| 1836 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1837 | cur_trans = trans->transaction; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1838 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1839 | /* |
| 1840 | * set the flushing flag so procs in this transaction have to |
| 1841 | * start sending their work down. |
| 1842 | */ |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1843 | cur_trans->delayed_refs.flushing = 1; |
Josef Bacik | 1be41b7 | 2013-06-12 13:56:06 -0400 | [diff] [blame] | 1844 | smp_wmb(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1845 | |
Josef Bacik | ea658ba | 2012-09-11 16:57:25 -0400 | [diff] [blame] | 1846 | if (!list_empty(&trans->new_bgs)) |
| 1847 | btrfs_create_pending_block_groups(trans, root); |
| 1848 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1849 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Josef Bacik | e4a2bca | 2013-02-06 16:55:41 -0500 | [diff] [blame] | 1850 | if (ret) { |
| 1851 | btrfs_end_transaction(trans, root); |
| 1852 | return ret; |
| 1853 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1854 | |
Josef Bacik | 3204d33 | 2015-09-24 10:46:10 -0400 | [diff] [blame] | 1855 | if (!test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &cur_trans->flags)) { |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1856 | int run_it = 0; |
| 1857 | |
| 1858 | /* this mutex is also taken before trying to set |
| 1859 | * block groups readonly. We need to make sure |
| 1860 | * that nobody has set a block group readonly |
| 1861 | * after a extents from that block group have been |
| 1862 | * allocated for cache files. btrfs_set_block_group_ro |
| 1863 | * will wait for the transaction to commit if it |
Josef Bacik | 3204d33 | 2015-09-24 10:46:10 -0400 | [diff] [blame] | 1864 | * finds BTRFS_TRANS_DIRTY_BG_RUN set. |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1865 | * |
Josef Bacik | 3204d33 | 2015-09-24 10:46:10 -0400 | [diff] [blame] | 1866 | * The BTRFS_TRANS_DIRTY_BG_RUN flag is also used to make sure |
| 1867 | * only one process starts all the block group IO. It wouldn't |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1868 | * hurt to have more than one go through, but there's no |
| 1869 | * real advantage to it either. |
| 1870 | */ |
| 1871 | mutex_lock(&root->fs_info->ro_block_group_mutex); |
Josef Bacik | 3204d33 | 2015-09-24 10:46:10 -0400 | [diff] [blame] | 1872 | if (!test_and_set_bit(BTRFS_TRANS_DIRTY_BG_RUN, |
| 1873 | &cur_trans->flags)) |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1874 | run_it = 1; |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1875 | mutex_unlock(&root->fs_info->ro_block_group_mutex); |
| 1876 | |
| 1877 | if (run_it) |
| 1878 | ret = btrfs_start_dirty_block_groups(trans, root); |
| 1879 | } |
| 1880 | if (ret) { |
| 1881 | btrfs_end_transaction(trans, root); |
| 1882 | return ret; |
| 1883 | } |
| 1884 | |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1885 | spin_lock(&root->fs_info->trans_lock); |
| 1886 | if (cur_trans->state >= TRANS_STATE_COMMIT_START) { |
| 1887 | spin_unlock(&root->fs_info->trans_lock); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1888 | atomic_inc(&cur_trans->use_count); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1889 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1890 | |
Li Zefan | b9c8300 | 2011-07-14 03:17:14 +0000 | [diff] [blame] | 1891 | wait_for_commit(root, cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1892 | |
Liu Bo | b4924a0 | 2015-03-06 20:23:44 +0800 | [diff] [blame] | 1893 | if (unlikely(cur_trans->aborted)) |
| 1894 | ret = cur_trans->aborted; |
| 1895 | |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 1896 | btrfs_put_transaction(cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1897 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1898 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1899 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1900 | |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1901 | cur_trans->state = TRANS_STATE_COMMIT_START; |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1902 | wake_up(&root->fs_info->transaction_blocked_wait); |
| 1903 | |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1904 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
| 1905 | prev_trans = list_entry(cur_trans->list.prev, |
| 1906 | struct btrfs_transaction, list); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1907 | if (prev_trans->state != TRANS_STATE_COMPLETED) { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1908 | atomic_inc(&prev_trans->use_count); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1909 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1910 | |
| 1911 | wait_for_commit(root, prev_trans); |
Filipe Manana | 1f9b8c8 | 2015-08-12 11:54:35 +0100 | [diff] [blame] | 1912 | ret = prev_trans->aborted; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1913 | |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 1914 | btrfs_put_transaction(prev_trans); |
Filipe Manana | 1f9b8c8 | 2015-08-12 11:54:35 +0100 | [diff] [blame] | 1915 | if (ret) |
| 1916 | goto cleanup_transaction; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1917 | } else { |
| 1918 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1919 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1920 | } else { |
| 1921 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1922 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1923 | |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 1924 | extwriter_counter_dec(cur_trans, trans->type); |
| 1925 | |
Miao Xie | 8243661 | 2013-05-15 07:48:28 +0000 | [diff] [blame] | 1926 | ret = btrfs_start_delalloc_flush(root->fs_info); |
| 1927 | if (ret) |
| 1928 | goto cleanup_transaction; |
| 1929 | |
Chris Mason | 8d875f9 | 2014-08-12 10:47:42 -0700 | [diff] [blame] | 1930 | ret = btrfs_run_delayed_items(trans, root); |
Miao Xie | 581227d | 2013-05-15 07:48:30 +0000 | [diff] [blame] | 1931 | if (ret) |
| 1932 | goto cleanup_transaction; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1933 | |
Miao Xie | 581227d | 2013-05-15 07:48:30 +0000 | [diff] [blame] | 1934 | wait_event(cur_trans->writer_wait, |
| 1935 | extwriter_counter_read(cur_trans) == 0); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1936 | |
Miao Xie | 581227d | 2013-05-15 07:48:30 +0000 | [diff] [blame] | 1937 | /* some pending stuffs might be added after the previous flush. */ |
Chris Mason | 8d875f9 | 2014-08-12 10:47:42 -0700 | [diff] [blame] | 1938 | ret = btrfs_run_delayed_items(trans, root); |
Miao Xie | ca46963 | 2012-11-01 07:33:14 +0000 | [diff] [blame] | 1939 | if (ret) |
| 1940 | goto cleanup_transaction; |
| 1941 | |
Miao Xie | 8243661 | 2013-05-15 07:48:28 +0000 | [diff] [blame] | 1942 | btrfs_wait_delalloc_flush(root->fs_info); |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 1943 | |
Josef Bacik | 161c3549 | 2015-09-24 16:17:39 -0400 | [diff] [blame] | 1944 | btrfs_wait_pending_ordered(cur_trans); |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 1945 | |
Wang Shilong | cb7ab02 | 2013-12-04 21:16:53 +0800 | [diff] [blame] | 1946 | btrfs_scrub_pause(root); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1947 | /* |
Josef Bacik | ed0ca14 | 2011-06-14 16:22:15 -0400 | [diff] [blame] | 1948 | * Ok now we need to make sure to block out any other joins while we |
| 1949 | * commit the transaction. We could have started a join before setting |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1950 | * COMMIT_DOING so make sure to wait for num_writers to == 1 again. |
Josef Bacik | ed0ca14 | 2011-06-14 16:22:15 -0400 | [diff] [blame] | 1951 | */ |
| 1952 | spin_lock(&root->fs_info->trans_lock); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 1953 | cur_trans->state = TRANS_STATE_COMMIT_DOING; |
Josef Bacik | ed0ca14 | 2011-06-14 16:22:15 -0400 | [diff] [blame] | 1954 | spin_unlock(&root->fs_info->trans_lock); |
| 1955 | wait_event(cur_trans->writer_wait, |
| 1956 | atomic_read(&cur_trans->num_writers) == 1); |
| 1957 | |
Miao Xie | 2cba30f | 2013-01-15 06:29:12 +0000 | [diff] [blame] | 1958 | /* ->aborted might be set after the previous check, so check it */ |
| 1959 | if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { |
| 1960 | ret = cur_trans->aborted; |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 1961 | goto scrub_continue; |
Miao Xie | 2cba30f | 2013-01-15 06:29:12 +0000 | [diff] [blame] | 1962 | } |
Chris Mason | e038dca | 2011-06-17 14:16:13 -0400 | [diff] [blame] | 1963 | /* |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1964 | * the reloc mutex makes sure that we stop |
| 1965 | * the balancing code from coming in and moving |
| 1966 | * extents around in the middle of the commit |
| 1967 | */ |
| 1968 | mutex_lock(&root->fs_info->reloc_mutex); |
| 1969 | |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1970 | /* |
| 1971 | * We needn't worry about the delayed items because we will |
| 1972 | * deal with them in create_pending_snapshot(), which is the |
| 1973 | * core function of the snapshot creation. |
| 1974 | */ |
| 1975 | ret = create_pending_snapshots(trans, root->fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1976 | if (ret) { |
| 1977 | mutex_unlock(&root->fs_info->reloc_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 1978 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1979 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1980 | |
Miao Xie | 42874b3 | 2012-09-06 04:03:32 -0600 | [diff] [blame] | 1981 | /* |
| 1982 | * We insert the dir indexes of the snapshots and update the inode |
| 1983 | * of the snapshots' parents after the snapshot creation, so there |
| 1984 | * are some delayed items which are not dealt with. Now deal with |
| 1985 | * them. |
| 1986 | * |
| 1987 | * We needn't worry that this operation will corrupt the snapshots, |
| 1988 | * because all the tree which are snapshoted will be forced to COW |
| 1989 | * the nodes and leaves. |
| 1990 | */ |
| 1991 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1992 | if (ret) { |
| 1993 | mutex_unlock(&root->fs_info->reloc_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 1994 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1995 | } |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1996 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1997 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1998 | if (ret) { |
| 1999 | mutex_unlock(&root->fs_info->reloc_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2000 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2001 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 2002 | |
Qu Wenruo | 0ed4792 | 2015-04-16 16:55:08 +0800 | [diff] [blame] | 2003 | /* Reocrd old roots for later qgroup accounting */ |
| 2004 | ret = btrfs_qgroup_prepare_account_extents(trans, root->fs_info); |
| 2005 | if (ret) { |
| 2006 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 2007 | goto scrub_continue; |
| 2008 | } |
| 2009 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 2010 | /* |
| 2011 | * make sure none of the code above managed to slip in a |
| 2012 | * delayed item |
| 2013 | */ |
| 2014 | btrfs_assert_delayed_root_empty(root); |
| 2015 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2016 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 2017 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2018 | /* btrfs_commit_tree_roots is responsible for getting the |
| 2019 | * various roots consistent with each other. Every pointer |
| 2020 | * in the tree of tree roots has to point to the most up to date |
| 2021 | * root for every subvolume and other tree. So, we have to keep |
| 2022 | * the tree logging code from jumping in and changing any |
| 2023 | * of the trees. |
| 2024 | * |
| 2025 | * At this point in the commit, there can't be any tree-log |
| 2026 | * writers, but a little lower down we drop the trans mutex |
| 2027 | * and let new people in. By holding the tree_log_mutex |
| 2028 | * from now until after the super is written, we avoid races |
| 2029 | * with the tree-log code. |
| 2030 | */ |
| 2031 | mutex_lock(&root->fs_info->tree_log_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 2032 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2033 | ret = commit_fs_roots(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2034 | if (ret) { |
| 2035 | mutex_unlock(&root->fs_info->tree_log_mutex); |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 2036 | mutex_unlock(&root->fs_info->reloc_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2037 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2038 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2039 | |
Qu Wenruo | 3818aea | 2014-01-13 13:36:06 +0800 | [diff] [blame] | 2040 | /* |
David Sterba | 7e1876a | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 2041 | * Since the transaction is done, we can apply the pending changes |
| 2042 | * before the next transaction. |
Qu Wenruo | 3818aea | 2014-01-13 13:36:06 +0800 | [diff] [blame] | 2043 | */ |
David Sterba | 572d9ab | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 2044 | btrfs_apply_pending_changes(root->fs_info); |
Qu Wenruo | 3818aea | 2014-01-13 13:36:06 +0800 | [diff] [blame] | 2045 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2046 | /* commit_fs_roots gets rid of all the tree log roots, it is now |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2047 | * safe to free the root of tree log roots |
| 2048 | */ |
| 2049 | btrfs_free_log_root_tree(trans, root->fs_info); |
| 2050 | |
Qu Wenruo | 0ed4792 | 2015-04-16 16:55:08 +0800 | [diff] [blame] | 2051 | /* |
| 2052 | * Since fs roots are all committed, we can get a quite accurate |
| 2053 | * new_roots. So let's do quota accounting. |
| 2054 | */ |
| 2055 | ret = btrfs_qgroup_account_extents(trans, root->fs_info); |
| 2056 | if (ret < 0) { |
| 2057 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 2058 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 2059 | goto scrub_continue; |
| 2060 | } |
| 2061 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2062 | ret = commit_cowonly_roots(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2063 | if (ret) { |
| 2064 | mutex_unlock(&root->fs_info->tree_log_mutex); |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 2065 | mutex_unlock(&root->fs_info->reloc_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2066 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2067 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2068 | |
Miao Xie | 2cba30f | 2013-01-15 06:29:12 +0000 | [diff] [blame] | 2069 | /* |
| 2070 | * The tasks which save the space cache and inode cache may also |
| 2071 | * update ->aborted, check it. |
| 2072 | */ |
| 2073 | if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { |
| 2074 | ret = cur_trans->aborted; |
| 2075 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 2076 | mutex_unlock(&root->fs_info->reloc_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2077 | goto scrub_continue; |
Miao Xie | 2cba30f | 2013-01-15 06:29:12 +0000 | [diff] [blame] | 2078 | } |
| 2079 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2080 | btrfs_prepare_extent_commit(trans, root); |
| 2081 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2082 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2083 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2084 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, |
| 2085 | root->fs_info->tree_root->node); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 2086 | list_add_tail(&root->fs_info->tree_root->dirty_list, |
| 2087 | &cur_trans->switch_commits); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2088 | |
| 2089 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, |
| 2090 | root->fs_info->chunk_root->node); |
Josef Bacik | 9e351cc | 2014-03-13 15:42:13 -0400 | [diff] [blame] | 2091 | list_add_tail(&root->fs_info->chunk_root->dirty_list, |
| 2092 | &cur_trans->switch_commits); |
| 2093 | |
| 2094 | switch_commit_roots(cur_trans, root->fs_info); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2095 | |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 2096 | assert_qgroups_uptodate(trans); |
Josef Bacik | ce93ec5 | 2014-11-17 15:45:48 -0500 | [diff] [blame] | 2097 | ASSERT(list_empty(&cur_trans->dirty_bgs)); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 2098 | ASSERT(list_empty(&cur_trans->io_bgs)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2099 | update_super_roots(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2100 | |
Josef Bacik | 60e7cd3 | 2013-09-30 14:10:43 -0400 | [diff] [blame] | 2101 | btrfs_set_super_log_root(root->fs_info->super_copy, 0); |
| 2102 | btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 2103 | memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, |
| 2104 | sizeof(*root->fs_info->super_copy)); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2105 | |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 2106 | btrfs_update_commit_device_size(root->fs_info); |
Miao Xie | ce7213c | 2014-09-03 21:35:34 +0800 | [diff] [blame] | 2107 | btrfs_update_commit_device_bytes_used(root, cur_trans); |
Miao Xie | 935e5cc | 2014-09-03 21:35:33 +0800 | [diff] [blame] | 2108 | |
Filipe Manana | 656f30d | 2014-09-26 12:25:56 +0100 | [diff] [blame] | 2109 | clear_bit(BTRFS_INODE_BTREE_LOG1_ERR, &btree_ino->runtime_flags); |
| 2110 | clear_bit(BTRFS_INODE_BTREE_LOG2_ERR, &btree_ino->runtime_flags); |
| 2111 | |
Filipe Manana | 4fbcdf6 | 2015-05-20 14:01:54 +0100 | [diff] [blame] | 2112 | btrfs_trans_release_chunk_metadata(trans); |
| 2113 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2114 | spin_lock(&root->fs_info->trans_lock); |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 2115 | cur_trans->state = TRANS_STATE_UNBLOCKED; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2116 | root->fs_info->running_transaction = NULL; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2117 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 2118 | mutex_unlock(&root->fs_info->reloc_mutex); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 2119 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 2120 | wake_up(&root->fs_info->transaction_wait); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2121 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 2122 | ret = btrfs_write_and_wait_transaction(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2123 | if (ret) { |
Anand Jain | a4553fe | 2015-09-25 14:43:01 +0800 | [diff] [blame] | 2124 | btrfs_std_error(root->fs_info, ret, |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 2125 | "Error while writing out transaction"); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2126 | mutex_unlock(&root->fs_info->tree_log_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2127 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2128 | } |
| 2129 | |
| 2130 | ret = write_ctree_super(trans, root, 0); |
| 2131 | if (ret) { |
| 2132 | mutex_unlock(&root->fs_info->tree_log_mutex); |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2133 | goto scrub_continue; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2134 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2135 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2136 | /* |
| 2137 | * the super is written, we can safely allow the tree-loggers |
| 2138 | * to go about their business |
| 2139 | */ |
| 2140 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 2141 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 2142 | btrfs_finish_extent_commit(trans, root); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2143 | |
Josef Bacik | 3204d33 | 2015-09-24 10:46:10 -0400 | [diff] [blame] | 2144 | if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS, &cur_trans->flags)) |
Zhao Lei | 13212b5 | 2015-02-12 14:18:17 +0800 | [diff] [blame] | 2145 | btrfs_clear_space_info_full(root->fs_info); |
| 2146 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 2147 | root->fs_info->last_trans_committed = cur_trans->transid; |
Miao Xie | 4a9d8bd | 2013-05-17 03:53:43 +0000 | [diff] [blame] | 2148 | /* |
| 2149 | * We needn't acquire the lock here because there is no other task |
| 2150 | * which can change it. |
| 2151 | */ |
| 2152 | cur_trans->state = TRANS_STATE_COMPLETED; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2153 | wake_up(&cur_trans->commit_wait); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 2154 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2155 | spin_lock(&root->fs_info->trans_lock); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 2156 | list_del_init(&cur_trans->list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2157 | spin_unlock(&root->fs_info->trans_lock); |
| 2158 | |
Josef Bacik | 724e231 | 2013-09-30 11:36:38 -0400 | [diff] [blame] | 2159 | btrfs_put_transaction(cur_trans); |
| 2160 | btrfs_put_transaction(cur_trans); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2161 | |
Miao Xie | 0860adf | 2013-05-15 07:48:27 +0000 | [diff] [blame] | 2162 | if (trans->type & __TRANS_FREEZABLE) |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 2163 | sb_end_intwrite(root->fs_info->sb); |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 2164 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 2165 | trace_btrfs_transaction_commit(root); |
| 2166 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 2167 | btrfs_scrub_continue(root); |
| 2168 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 2169 | if (current->journal_info == trans) |
| 2170 | current->journal_info = NULL; |
| 2171 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2172 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 2173 | |
Zhao Lei | 8a73301 | 2015-07-15 11:48:14 +0800 | [diff] [blame] | 2174 | if (current != root->fs_info->transaction_kthread && |
| 2175 | current != root->fs_info->cleaner_kthread) |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 2176 | btrfs_run_delayed_iputs(root); |
| 2177 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 2178 | return ret; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2179 | |
Wang Shilong | 6cf7f77 | 2014-02-19 19:24:16 +0800 | [diff] [blame] | 2180 | scrub_continue: |
| 2181 | btrfs_scrub_continue(root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2182 | cleanup_transaction: |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 2183 | btrfs_trans_release_metadata(trans, root); |
Filipe Manana | 4fbcdf6 | 2015-05-20 14:01:54 +0100 | [diff] [blame] | 2184 | btrfs_trans_release_chunk_metadata(trans); |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 2185 | trans->block_rsv = NULL; |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 2186 | btrfs_warn(root->fs_info, "Skipping commit of aborted transaction."); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2187 | if (current->journal_info == trans) |
| 2188 | current->journal_info = NULL; |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 2189 | cleanup_transaction(trans, root, ret); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 2190 | |
| 2191 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 2192 | } |
| 2193 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2194 | /* |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 2195 | * return < 0 if error |
| 2196 | * 0 if there are no more dead_roots at the time of call |
| 2197 | * 1 there are more to be processed, call me again |
| 2198 | * |
| 2199 | * The return value indicates there are certainly more snapshots to delete, but |
| 2200 | * if there comes a new one during processing, it may return 0. We don't mind, |
| 2201 | * because btrfs_commit_super will poke cleaner thread and it will process it a |
| 2202 | * few seconds later. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2203 | */ |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 2204 | int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2205 | { |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 2206 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2207 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2208 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2209 | spin_lock(&fs_info->trans_lock); |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 2210 | if (list_empty(&fs_info->dead_roots)) { |
| 2211 | spin_unlock(&fs_info->trans_lock); |
| 2212 | return 0; |
| 2213 | } |
| 2214 | root = list_first_entry(&fs_info->dead_roots, |
| 2215 | struct btrfs_root, root_list); |
Josef Bacik | cfad392 | 2013-07-25 15:11:47 -0400 | [diff] [blame] | 2216 | list_del_init(&root->root_list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 2217 | spin_unlock(&fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2218 | |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2219 | pr_debug("BTRFS: cleaner removing %llu\n", root->objectid); |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 2220 | |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 2221 | btrfs_kill_all_delayed_nodes(root); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2222 | |
David Sterba | 9d1a2a3 | 2013-03-12 15:13:28 +0000 | [diff] [blame] | 2223 | if (btrfs_header_backref_rev(root->node) < |
| 2224 | BTRFS_MIXED_BACKREF_REV) |
| 2225 | ret = btrfs_drop_snapshot(root, NULL, 0, 0); |
| 2226 | else |
| 2227 | ret = btrfs_drop_snapshot(root, NULL, 1, 0); |
David Sterba | 32471dc | 2014-02-05 02:03:47 +0100 | [diff] [blame] | 2228 | |
Josef Bacik | 6596a928 | 2013-07-31 10:28:05 -0400 | [diff] [blame] | 2229 | return (ret < 0) ? 0 : 1; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2230 | } |
David Sterba | 572d9ab | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 2231 | |
| 2232 | void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info) |
| 2233 | { |
| 2234 | unsigned long prev; |
| 2235 | unsigned long bit; |
| 2236 | |
Qu Wenruo | 6c9fe14 | 2015-01-20 17:05:33 +0800 | [diff] [blame] | 2237 | prev = xchg(&fs_info->pending_changes, 0); |
David Sterba | 572d9ab | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 2238 | if (!prev) |
| 2239 | return; |
| 2240 | |
David Sterba | 7e1876a | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 2241 | bit = 1 << BTRFS_PENDING_SET_INODE_MAP_CACHE; |
| 2242 | if (prev & bit) |
| 2243 | btrfs_set_opt(fs_info->mount_opt, INODE_MAP_CACHE); |
| 2244 | prev &= ~bit; |
| 2245 | |
| 2246 | bit = 1 << BTRFS_PENDING_CLEAR_INODE_MAP_CACHE; |
| 2247 | if (prev & bit) |
| 2248 | btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE); |
| 2249 | prev &= ~bit; |
| 2250 | |
David Sterba | d51033d | 2014-11-12 14:24:35 +0100 | [diff] [blame] | 2251 | bit = 1 << BTRFS_PENDING_COMMIT; |
| 2252 | if (prev & bit) |
| 2253 | btrfs_debug(fs_info, "pending commit done"); |
| 2254 | prev &= ~bit; |
| 2255 | |
David Sterba | 572d9ab | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 2256 | if (prev) |
| 2257 | btrfs_warn(fs_info, |
| 2258 | "unknown pending changes left 0x%lx, ignoring", prev); |
| 2259 | } |