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" |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 33 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 34 | #define BTRFS_ROOT_TRANS_TAG 0 |
| 35 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 36 | void put_transaction(struct btrfs_transaction *transaction) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 37 | { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 38 | WARN_ON(atomic_read(&transaction->use_count) == 0); |
| 39 | if (atomic_dec_and_test(&transaction->use_count)) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 40 | BUG_ON(!list_empty(&transaction->list)); |
Arne Jansen | 00f04b8 | 2011-09-14 12:37:00 +0200 | [diff] [blame] | 41 | WARN_ON(transaction->delayed_refs.root.rb_node); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 42 | memset(transaction, 0, sizeof(*transaction)); |
| 43 | kmem_cache_free(btrfs_transaction_cachep, transaction); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 44 | } |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 45 | } |
| 46 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 47 | static noinline void switch_commit_root(struct btrfs_root *root) |
| 48 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 49 | free_extent_buffer(root->commit_root); |
| 50 | root->commit_root = btrfs_root_node(root); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 51 | } |
| 52 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 53 | /* |
| 54 | * either allocate a new transaction or hop into the existing one |
| 55 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 56 | static noinline int join_transaction(struct btrfs_root *root, int nofail) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 57 | { |
| 58 | struct btrfs_transaction *cur_trans; |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 59 | struct btrfs_fs_info *fs_info = root->fs_info; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 60 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 61 | spin_lock(&fs_info->trans_lock); |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 62 | loop: |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 63 | /* The file system has been taken offline. No new transactions. */ |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 64 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 65 | spin_unlock(&fs_info->trans_lock); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 66 | return -EROFS; |
| 67 | } |
| 68 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 69 | if (fs_info->trans_no_join) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 70 | if (!nofail) { |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 71 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 72 | return -EBUSY; |
| 73 | } |
| 74 | } |
| 75 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 76 | cur_trans = fs_info->running_transaction; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 77 | if (cur_trans) { |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 78 | if (cur_trans->aborted) { |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 79 | spin_unlock(&fs_info->trans_lock); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 80 | return cur_trans->aborted; |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 81 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 82 | atomic_inc(&cur_trans->use_count); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 83 | atomic_inc(&cur_trans->num_writers); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 84 | cur_trans->num_joined++; |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 85 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 86 | return 0; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 87 | } |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 88 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 89 | |
| 90 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); |
| 91 | if (!cur_trans) |
| 92 | return -ENOMEM; |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 93 | |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 94 | spin_lock(&fs_info->trans_lock); |
| 95 | if (fs_info->running_transaction) { |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 96 | /* |
| 97 | * someone started a transaction after we unlocked. Make sure |
| 98 | * to redo the trans_no_join checks above |
| 99 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 100 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 101 | cur_trans = fs_info->running_transaction; |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 102 | goto loop; |
Dan Carpenter | e4b50e1 | 2012-06-19 13:30:11 +0300 | [diff] [blame] | 103 | } else if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 104 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 105 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
| 106 | return -EROFS; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 107 | } |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 108 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 109 | atomic_set(&cur_trans->num_writers, 1); |
| 110 | cur_trans->num_joined = 0; |
| 111 | init_waitqueue_head(&cur_trans->writer_wait); |
| 112 | init_waitqueue_head(&cur_trans->commit_wait); |
| 113 | cur_trans->in_commit = 0; |
| 114 | cur_trans->blocked = 0; |
| 115 | /* |
| 116 | * One for this trans handle, one so it will live on until we |
| 117 | * commit the transaction. |
| 118 | */ |
| 119 | atomic_set(&cur_trans->use_count, 2); |
| 120 | cur_trans->commit_done = 0; |
| 121 | cur_trans->start_time = get_seconds(); |
| 122 | |
| 123 | cur_trans->delayed_refs.root = RB_ROOT; |
| 124 | cur_trans->delayed_refs.num_entries = 0; |
| 125 | cur_trans->delayed_refs.num_heads_ready = 0; |
| 126 | cur_trans->delayed_refs.num_heads = 0; |
| 127 | cur_trans->delayed_refs.flushing = 0; |
| 128 | cur_trans->delayed_refs.run_delayed_start = 0; |
Jan Schmidt | 20b297d | 2012-05-20 15:43:53 +0200 | [diff] [blame] | 129 | |
| 130 | /* |
| 131 | * although the tree mod log is per file system and not per transaction, |
| 132 | * the log must never go across transaction boundaries. |
| 133 | */ |
| 134 | smp_mb(); |
| 135 | if (!list_empty(&fs_info->tree_mod_seq_list)) { |
| 136 | printk(KERN_ERR "btrfs: tree_mod_seq_list not empty when " |
| 137 | "creating a fresh transaction\n"); |
| 138 | WARN_ON(1); |
| 139 | } |
| 140 | if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) { |
| 141 | printk(KERN_ERR "btrfs: tree_mod_log rb tree not empty when " |
| 142 | "creating a fresh transaction\n"); |
| 143 | WARN_ON(1); |
| 144 | } |
| 145 | atomic_set(&fs_info->tree_mod_seq, 0); |
| 146 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 147 | spin_lock_init(&cur_trans->commit_lock); |
| 148 | spin_lock_init(&cur_trans->delayed_refs.lock); |
| 149 | |
| 150 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 151 | list_add_tail(&cur_trans->list, &fs_info->trans_list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 152 | extent_io_tree_init(&cur_trans->dirty_pages, |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 153 | fs_info->btree_inode->i_mapping); |
| 154 | fs_info->generation++; |
| 155 | cur_trans->transid = fs_info->generation; |
| 156 | fs_info->running_transaction = cur_trans; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 157 | cur_trans->aborted = 0; |
Jan Schmidt | 19ae4e8 | 2012-05-20 15:42:19 +0200 | [diff] [blame] | 158 | spin_unlock(&fs_info->trans_lock); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 159 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 160 | return 0; |
| 161 | } |
| 162 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 163 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 164 | * this does all the record keeping required to make sure that a reference |
| 165 | * counted root is properly recorded in a given transaction. This is required |
| 166 | * to make sure the old root from before we joined the transaction is deleted |
| 167 | * when the transaction commits |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 168 | */ |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 169 | static int record_root_in_trans(struct btrfs_trans_handle *trans, |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 170 | struct btrfs_root *root) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 171 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 172 | if (root->ref_cows && root->last_trans < trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 173 | WARN_ON(root == root->fs_info->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 174 | WARN_ON(root->commit_root != root->node); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 175 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 176 | /* |
| 177 | * see below for in_trans_setup usage rules |
| 178 | * we have the reloc mutex held now, so there |
| 179 | * is only one writer in this function |
| 180 | */ |
| 181 | root->in_trans_setup = 1; |
| 182 | |
| 183 | /* make sure readers find in_trans_setup before |
| 184 | * they find our root->last_trans update |
| 185 | */ |
| 186 | smp_wmb(); |
| 187 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 188 | spin_lock(&root->fs_info->fs_roots_radix_lock); |
| 189 | if (root->last_trans == trans->transid) { |
| 190 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
| 191 | return 0; |
| 192 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 193 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, |
| 194 | (unsigned long)root->root_key.objectid, |
| 195 | BTRFS_ROOT_TRANS_TAG); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 196 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 197 | root->last_trans = trans->transid; |
| 198 | |
| 199 | /* this is pretty tricky. We don't want to |
| 200 | * take the relocation lock in btrfs_record_root_in_trans |
| 201 | * unless we're really doing the first setup for this root in |
| 202 | * this transaction. |
| 203 | * |
| 204 | * Normally we'd use root->last_trans as a flag to decide |
| 205 | * if we want to take the expensive mutex. |
| 206 | * |
| 207 | * But, we have to set root->last_trans before we |
| 208 | * init the relocation root, otherwise, we trip over warnings |
| 209 | * in ctree.c. The solution used here is to flag ourselves |
| 210 | * with root->in_trans_setup. When this is 1, we're still |
| 211 | * fixing up the reloc trees and everyone must wait. |
| 212 | * |
| 213 | * When this is zero, they can trust root->last_trans and fly |
| 214 | * through btrfs_record_root_in_trans without having to take the |
| 215 | * lock. smp_wmb() makes sure that all the writes above are |
| 216 | * done before we pop in the zero below |
| 217 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 218 | btrfs_init_reloc_root(trans, root); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 219 | smp_wmb(); |
| 220 | root->in_trans_setup = 0; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 221 | } |
| 222 | return 0; |
| 223 | } |
| 224 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 225 | |
| 226 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
| 227 | struct btrfs_root *root) |
| 228 | { |
| 229 | if (!root->ref_cows) |
| 230 | return 0; |
| 231 | |
| 232 | /* |
| 233 | * see record_root_in_trans for comments about in_trans_setup usage |
| 234 | * and barriers |
| 235 | */ |
| 236 | smp_rmb(); |
| 237 | if (root->last_trans == trans->transid && |
| 238 | !root->in_trans_setup) |
| 239 | return 0; |
| 240 | |
| 241 | mutex_lock(&root->fs_info->reloc_mutex); |
| 242 | record_root_in_trans(trans, root); |
| 243 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 248 | /* wait for commit against the current transaction to become unblocked |
| 249 | * when this is done, it is safe to start a new transaction, but the current |
| 250 | * transaction might not be fully on disk. |
| 251 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 252 | static void wait_current_trans(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 253 | { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 254 | struct btrfs_transaction *cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 255 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 256 | spin_lock(&root->fs_info->trans_lock); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 257 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 258 | if (cur_trans && cur_trans->blocked) { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 259 | atomic_inc(&cur_trans->use_count); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 260 | spin_unlock(&root->fs_info->trans_lock); |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 261 | |
| 262 | wait_event(root->fs_info->transaction_wait, |
| 263 | !cur_trans->blocked); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 264 | put_transaction(cur_trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 265 | } else { |
| 266 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 267 | } |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 268 | } |
| 269 | |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 270 | enum btrfs_trans_type { |
| 271 | TRANS_START, |
| 272 | TRANS_JOIN, |
| 273 | TRANS_USERSPACE, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 274 | TRANS_JOIN_NOLOCK, |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 275 | }; |
| 276 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 277 | static int may_wait_transaction(struct btrfs_root *root, int type) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 278 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 279 | if (root->fs_info->log_root_recovering) |
| 280 | return 0; |
| 281 | |
| 282 | if (type == TRANS_USERSPACE) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 283 | return 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 284 | |
| 285 | if (type == TRANS_START && |
| 286 | !atomic_read(&root->fs_info->open_ioctl_trans)) |
| 287 | return 1; |
| 288 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, |
| 293 | u64 num_items, int type) |
| 294 | { |
| 295 | struct btrfs_trans_handle *h; |
| 296 | struct btrfs_transaction *cur_trans; |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 297 | u64 num_bytes = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 298 | int ret; |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 299 | u64 qgroup_reserved = 0; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 300 | |
| 301 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) |
| 302 | return ERR_PTR(-EROFS); |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 303 | |
| 304 | if (current->journal_info) { |
| 305 | WARN_ON(type != TRANS_JOIN && type != TRANS_JOIN_NOLOCK); |
| 306 | h = current->journal_info; |
| 307 | h->use_count++; |
| 308 | h->orig_rsv = h->block_rsv; |
| 309 | h->block_rsv = NULL; |
| 310 | goto got_it; |
| 311 | } |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 312 | |
| 313 | /* |
| 314 | * Do the reservation before we join the transaction so we can do all |
| 315 | * the appropriate flushing if need be. |
| 316 | */ |
| 317 | if (num_items > 0 && root != root->fs_info->chunk_root) { |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 318 | if (root->fs_info->quota_enabled && |
| 319 | is_fstree(root->root_key.objectid)) { |
| 320 | qgroup_reserved = num_items * root->leafsize; |
| 321 | ret = btrfs_qgroup_reserve(root, qgroup_reserved); |
| 322 | if (ret) |
| 323 | return ERR_PTR(ret); |
| 324 | } |
| 325 | |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 326 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 327 | ret = btrfs_block_rsv_add(root, |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 328 | &root->fs_info->trans_block_rsv, |
| 329 | num_bytes); |
| 330 | if (ret) |
| 331 | return ERR_PTR(ret); |
| 332 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 333 | again: |
| 334 | h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); |
| 335 | if (!h) |
| 336 | return ERR_PTR(-ENOMEM); |
| 337 | |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 338 | sb_start_intwrite(root->fs_info->sb); |
| 339 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 340 | if (may_wait_transaction(root, type)) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 341 | wait_current_trans(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 342 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 343 | do { |
| 344 | ret = join_transaction(root, type == TRANS_JOIN_NOLOCK); |
| 345 | if (ret == -EBUSY) |
| 346 | wait_current_trans(root); |
| 347 | } while (ret == -EBUSY); |
| 348 | |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 349 | if (ret < 0) { |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 350 | sb_end_intwrite(root->fs_info->sb); |
Yoshinori Sano | 6e8df2a | 2011-04-03 12:31:28 +0000 | [diff] [blame] | 351 | kmem_cache_free(btrfs_trans_handle_cachep, h); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 352 | return ERR_PTR(ret); |
| 353 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 354 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 355 | cur_trans = root->fs_info->running_transaction; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 356 | |
| 357 | h->transid = cur_trans->transid; |
| 358 | h->transaction = cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 359 | h->blocks_used = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 360 | h->bytes_reserved = 0; |
Arne Jansen | d13603e | 2011-09-13 11:40:09 +0200 | [diff] [blame] | 361 | h->root = root; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 362 | h->delayed_ref_updates = 0; |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 363 | h->use_count = 1; |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 364 | h->adding_csums = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 365 | h->block_rsv = NULL; |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 366 | h->orig_rsv = NULL; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 367 | h->aborted = 0; |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 368 | h->qgroup_reserved = qgroup_reserved; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 369 | h->delayed_ref_elem.seq = 0; |
| 370 | INIT_LIST_HEAD(&h->qgroup_ref_list); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 371 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 372 | smp_mb(); |
| 373 | if (cur_trans->blocked && may_wait_transaction(root, type)) { |
| 374 | btrfs_commit_transaction(h, root); |
| 375 | goto again; |
| 376 | } |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 377 | |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 378 | if (num_bytes) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 379 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 380 | h->transid, num_bytes, 1); |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 381 | h->block_rsv = &root->fs_info->trans_block_rsv; |
| 382 | h->bytes_reserved = num_bytes; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 383 | } |
| 384 | |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 385 | got_it: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 386 | btrfs_record_root_in_trans(h, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 387 | |
| 388 | if (!current->journal_info && type != TRANS_USERSPACE) |
| 389 | current->journal_info = h; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 390 | return h; |
| 391 | } |
| 392 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 393 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 394 | int num_items) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 395 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 396 | return start_transaction(root, num_items, TRANS_START); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 397 | } |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 398 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 399 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 400 | return start_transaction(root, 0, TRANS_JOIN); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 401 | } |
| 402 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 403 | struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 404 | { |
| 405 | return start_transaction(root, 0, TRANS_JOIN_NOLOCK); |
| 406 | } |
| 407 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 408 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 409 | { |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 410 | return start_transaction(root, 0, TRANS_USERSPACE); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 411 | } |
| 412 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 413 | /* wait for a transaction commit to be fully complete */ |
Li Zefan | b9c8300 | 2011-07-14 03:17:14 +0000 | [diff] [blame] | 414 | static noinline void wait_for_commit(struct btrfs_root *root, |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 415 | struct btrfs_transaction *commit) |
| 416 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 417 | wait_event(commit->commit_wait, commit->commit_done); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 418 | } |
| 419 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 420 | int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) |
| 421 | { |
| 422 | struct btrfs_transaction *cur_trans = NULL, *t; |
| 423 | int ret; |
| 424 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 425 | ret = 0; |
| 426 | if (transid) { |
| 427 | if (transid <= root->fs_info->last_trans_committed) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 428 | goto out; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 429 | |
| 430 | /* find specified transaction */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 431 | spin_lock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 432 | list_for_each_entry(t, &root->fs_info->trans_list, list) { |
| 433 | if (t->transid == transid) { |
| 434 | cur_trans = t; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 435 | atomic_inc(&cur_trans->use_count); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 436 | break; |
| 437 | } |
| 438 | if (t->transid > transid) |
| 439 | break; |
| 440 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 441 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 442 | ret = -EINVAL; |
| 443 | if (!cur_trans) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 444 | goto out; /* bad transid */ |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 445 | } else { |
| 446 | /* find newest transaction that is committing | committed */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 447 | spin_lock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 448 | list_for_each_entry_reverse(t, &root->fs_info->trans_list, |
| 449 | list) { |
| 450 | if (t->in_commit) { |
| 451 | if (t->commit_done) |
Josef Bacik | 3473f3c | 2011-06-09 10:15:17 -0400 | [diff] [blame] | 452 | break; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 453 | cur_trans = t; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 454 | atomic_inc(&cur_trans->use_count); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 455 | break; |
| 456 | } |
| 457 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 458 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 459 | if (!cur_trans) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 460 | goto out; /* nothing committing|committed */ |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 461 | } |
| 462 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 463 | wait_for_commit(root, cur_trans); |
| 464 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 465 | put_transaction(cur_trans); |
| 466 | ret = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 467 | out: |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 468 | return ret; |
| 469 | } |
| 470 | |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 471 | void btrfs_throttle(struct btrfs_root *root) |
| 472 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 473 | if (!atomic_read(&root->fs_info->open_ioctl_trans)) |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 474 | wait_current_trans(root); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 475 | } |
| 476 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 477 | static int should_end_transaction(struct btrfs_trans_handle *trans, |
| 478 | struct btrfs_root *root) |
| 479 | { |
| 480 | int ret; |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 481 | |
| 482 | ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 483 | return ret ? 1 : 0; |
| 484 | } |
| 485 | |
| 486 | int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, |
| 487 | struct btrfs_root *root) |
| 488 | { |
| 489 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 490 | int updates; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 491 | int err; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 492 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 493 | smp_mb(); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 494 | if (cur_trans->blocked || cur_trans->delayed_refs.flushing) |
| 495 | return 1; |
| 496 | |
| 497 | updates = trans->delayed_ref_updates; |
| 498 | trans->delayed_ref_updates = 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 499 | if (updates) { |
| 500 | err = btrfs_run_delayed_refs(trans, root, updates); |
| 501 | if (err) /* Error code will also eval true */ |
| 502 | return err; |
| 503 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 504 | |
| 505 | return should_end_transaction(trans, root); |
| 506 | } |
| 507 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 508 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 509 | struct btrfs_root *root, int throttle, int lock) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 510 | { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 511 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 512 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 513 | int count = 0; |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 514 | int err = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 515 | |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 516 | if (--trans->use_count) { |
| 517 | trans->block_rsv = trans->orig_rsv; |
| 518 | return 0; |
| 519 | } |
| 520 | |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 521 | /* |
| 522 | * do the qgroup accounting as early as possible |
| 523 | */ |
| 524 | err = btrfs_delayed_refs_qgroup_accounting(trans, info); |
| 525 | |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 526 | btrfs_trans_release_metadata(trans, root); |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 527 | trans->block_rsv = NULL; |
Arne Jansen | d13603e | 2011-09-13 11:40:09 +0200 | [diff] [blame] | 528 | /* |
| 529 | * the same root has to be passed to start_transaction and |
| 530 | * end_transaction. Subvolume quota depends on this. |
| 531 | */ |
| 532 | WARN_ON(trans->root != root); |
Arne Jansen | c556723 | 2011-09-14 15:44:05 +0200 | [diff] [blame] | 533 | |
| 534 | if (trans->qgroup_reserved) { |
| 535 | btrfs_qgroup_free(root, trans->qgroup_reserved); |
| 536 | trans->qgroup_reserved = 0; |
| 537 | } |
| 538 | |
Chris Mason | 203bf28 | 2012-01-06 15:23:57 -0500 | [diff] [blame] | 539 | while (count < 2) { |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 540 | unsigned long cur = trans->delayed_ref_updates; |
| 541 | trans->delayed_ref_updates = 0; |
| 542 | if (cur && |
| 543 | trans->transaction->delayed_refs.num_heads_ready > 64) { |
| 544 | trans->delayed_ref_updates = 0; |
| 545 | btrfs_run_delayed_refs(trans, root, cur); |
| 546 | } else { |
| 547 | break; |
| 548 | } |
| 549 | count++; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 550 | } |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 551 | btrfs_trans_release_metadata(trans, root); |
| 552 | trans->block_rsv = NULL; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 553 | |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 554 | sb_end_intwrite(root->fs_info->sb); |
| 555 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 556 | if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && |
| 557 | should_end_transaction(trans, root)) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 558 | trans->transaction->blocked = 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 559 | smp_wmb(); |
| 560 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 561 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 562 | if (lock && cur_trans->blocked && !cur_trans->in_commit) { |
Josef Bacik | 81317fd | 2011-07-24 15:45:34 -0400 | [diff] [blame] | 563 | if (throttle) { |
| 564 | /* |
| 565 | * We may race with somebody else here so end up having |
| 566 | * to call end_transaction on ourselves again, so inc |
| 567 | * our use_count. |
| 568 | */ |
| 569 | trans->use_count++; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 570 | return btrfs_commit_transaction(trans, root); |
Josef Bacik | 81317fd | 2011-07-24 15:45:34 -0400 | [diff] [blame] | 571 | } else { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 572 | wake_up_process(info->transaction_kthread); |
Josef Bacik | 81317fd | 2011-07-24 15:45:34 -0400 | [diff] [blame] | 573 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 574 | } |
| 575 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 576 | WARN_ON(cur_trans != info->running_transaction); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 577 | WARN_ON(atomic_read(&cur_trans->num_writers) < 1); |
| 578 | atomic_dec(&cur_trans->num_writers); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 579 | |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 580 | smp_mb(); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 581 | if (waitqueue_active(&cur_trans->writer_wait)) |
| 582 | wake_up(&cur_trans->writer_wait); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 583 | put_transaction(cur_trans); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 584 | |
| 585 | if (current->journal_info == trans) |
| 586 | current->journal_info = NULL; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 587 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 588 | if (throttle) |
| 589 | btrfs_run_delayed_iputs(root); |
| 590 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 591 | if (trans->aborted || |
| 592 | root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 593 | err = -EIO; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 594 | } |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 595 | assert_qgroups_uptodate(trans); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 596 | |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 597 | memset(trans, 0, sizeof(*trans)); |
| 598 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
| 599 | return err; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 600 | } |
| 601 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 602 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 603 | struct btrfs_root *root) |
| 604 | { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 605 | int ret; |
| 606 | |
| 607 | ret = __btrfs_end_transaction(trans, root, 0, 1); |
| 608 | if (ret) |
| 609 | return ret; |
| 610 | return 0; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, |
| 614 | struct btrfs_root *root) |
| 615 | { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 616 | int ret; |
| 617 | |
| 618 | ret = __btrfs_end_transaction(trans, root, 1, 1); |
| 619 | if (ret) |
| 620 | return ret; |
| 621 | return 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, |
| 625 | struct btrfs_root *root) |
| 626 | { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 627 | int ret; |
| 628 | |
| 629 | ret = __btrfs_end_transaction(trans, root, 0, 0); |
| 630 | if (ret) |
| 631 | return ret; |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans, |
| 636 | struct btrfs_root *root) |
| 637 | { |
| 638 | return __btrfs_end_transaction(trans, root, 1, 1); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 639 | } |
| 640 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 641 | /* |
| 642 | * when btree blocks are allocated, they have some corresponding bits set for |
| 643 | * 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] | 644 | * those extents are sent to disk but does not wait on them |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 645 | */ |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 646 | int btrfs_write_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 647 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 648 | { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 649 | int err = 0; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 650 | int werr = 0; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 651 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 652 | u64 start = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 653 | u64 end; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 654 | |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 655 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
| 656 | mark)) { |
| 657 | convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, mark, |
| 658 | GFP_NOFS); |
| 659 | err = filemap_fdatawrite_range(mapping, start, end); |
| 660 | if (err) |
| 661 | werr = err; |
| 662 | cond_resched(); |
| 663 | start = end + 1; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 664 | } |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 665 | if (err) |
| 666 | werr = err; |
| 667 | return werr; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * when btree blocks are allocated, they have some corresponding bits set for |
| 672 | * them in one of two extent_io trees. This is used to make sure all of |
| 673 | * those extents are on disk for transaction or log commit. We wait |
| 674 | * on all the pages and clear them from the dirty pages state tree |
| 675 | */ |
| 676 | int btrfs_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 677 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 678 | { |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 679 | int err = 0; |
| 680 | int werr = 0; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 681 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 682 | u64 start = 0; |
| 683 | u64 end; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 684 | |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 685 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
| 686 | EXTENT_NEED_WAIT)) { |
| 687 | clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS); |
| 688 | err = filemap_fdatawait_range(mapping, start, end); |
| 689 | if (err) |
| 690 | werr = err; |
| 691 | cond_resched(); |
| 692 | start = end + 1; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 693 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 694 | if (err) |
| 695 | werr = err; |
| 696 | return werr; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 697 | } |
| 698 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 699 | /* |
| 700 | * when btree blocks are allocated, they have some corresponding bits set for |
| 701 | * them in one of two extent_io trees. This is used to make sure all of |
| 702 | * those extents are on disk for transaction or log commit |
| 703 | */ |
| 704 | int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 705 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 706 | { |
| 707 | int ret; |
| 708 | int ret2; |
| 709 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 710 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
| 711 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
Chris Mason | bf0da8c | 2011-11-04 12:29:37 -0400 | [diff] [blame] | 712 | |
| 713 | if (ret) |
| 714 | return ret; |
| 715 | if (ret2) |
| 716 | return ret2; |
| 717 | return 0; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 718 | } |
| 719 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 720 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
| 721 | struct btrfs_root *root) |
| 722 | { |
| 723 | if (!trans || !trans->transaction) { |
| 724 | struct inode *btree_inode; |
| 725 | btree_inode = root->fs_info->btree_inode; |
| 726 | return filemap_write_and_wait(btree_inode->i_mapping); |
| 727 | } |
| 728 | return btrfs_write_and_wait_marked_extents(root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 729 | &trans->transaction->dirty_pages, |
| 730 | EXTENT_DIRTY); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 731 | } |
| 732 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 733 | /* |
| 734 | * this is used to update the root pointer in the tree of tree roots. |
| 735 | * |
| 736 | * But, in the case of the extent allocation tree, updating the root |
| 737 | * pointer may allocate blocks which may change the root of the extent |
| 738 | * allocation tree. |
| 739 | * |
| 740 | * So, this loops and repeats and makes sure the cowonly root didn't |
| 741 | * change while the root pointer was being updated in the metadata. |
| 742 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 743 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
| 744 | struct btrfs_root *root) |
| 745 | { |
| 746 | int ret; |
| 747 | u64 old_root_bytenr; |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 748 | u64 old_root_used; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 749 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 750 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 751 | old_root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 752 | btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 753 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 754 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 755 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 756 | if (old_root_bytenr == root->node->start && |
| 757 | old_root_used == btrfs_root_used(&root->root_item)) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 758 | break; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 759 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 760 | btrfs_set_root_node(&root->root_item, root->node); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 761 | ret = btrfs_update_root(trans, tree_root, |
| 762 | &root->root_key, |
| 763 | &root->root_item); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 764 | if (ret) |
| 765 | return ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 766 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 767 | old_root_used = btrfs_root_used(&root->root_item); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 768 | ret = btrfs_write_dirty_block_groups(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 769 | if (ret) |
| 770 | return ret; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 771 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 772 | |
| 773 | if (root != root->fs_info->extent_root) |
| 774 | switch_commit_root(root); |
| 775 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 776 | return 0; |
| 777 | } |
| 778 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 779 | /* |
| 780 | * update all the cowonly tree roots on disk |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 781 | * |
| 782 | * The error handling in this function may not be obvious. Any of the |
| 783 | * failures will cause the file system to go offline. We still need |
| 784 | * to clean up the delayed refs. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 785 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 786 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
| 787 | struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 788 | { |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 789 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 790 | struct list_head *next; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 791 | struct extent_buffer *eb; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 792 | int ret; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 793 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 794 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 795 | if (ret) |
| 796 | return ret; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 797 | |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 798 | eb = btrfs_lock_root_node(fs_info->tree_root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 799 | ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, |
| 800 | 0, &eb); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 801 | btrfs_tree_unlock(eb); |
| 802 | free_extent_buffer(eb); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 803 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 804 | if (ret) |
| 805 | return ret; |
| 806 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 807 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 808 | if (ret) |
| 809 | return ret; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 810 | |
Stefan Behrens | 733f4fb | 2012-05-25 16:06:10 +0200 | [diff] [blame] | 811 | ret = btrfs_run_dev_stats(trans, root->fs_info); |
| 812 | BUG_ON(ret); |
| 813 | |
Jan Schmidt | 546adb0 | 2012-06-14 16:37:44 +0200 | [diff] [blame] | 814 | ret = btrfs_run_qgroups(trans, root->fs_info); |
| 815 | BUG_ON(ret); |
| 816 | |
| 817 | /* run_qgroups might have added some more refs */ |
| 818 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 819 | BUG_ON(ret); |
| 820 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 821 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 822 | next = fs_info->dirty_cowonly_roots.next; |
| 823 | list_del_init(next); |
| 824 | root = list_entry(next, struct btrfs_root, dirty_list); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 825 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 826 | ret = update_cowonly_root(trans, root); |
| 827 | if (ret) |
| 828 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 829 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 830 | |
| 831 | down_write(&fs_info->extent_commit_sem); |
| 832 | switch_commit_root(fs_info->extent_root); |
| 833 | up_write(&fs_info->extent_commit_sem); |
| 834 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 835 | return 0; |
| 836 | } |
| 837 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 838 | /* |
| 839 | * dead roots are old snapshots that need to be deleted. This allocates |
| 840 | * a dirty root struct and adds it into the list of dead roots that need to |
| 841 | * be deleted |
| 842 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 843 | int btrfs_add_dead_root(struct btrfs_root *root) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 844 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 845 | spin_lock(&root->fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 846 | list_add(&root->root_list, &root->fs_info->dead_roots); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 847 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 848 | return 0; |
| 849 | } |
| 850 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 851 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 852 | * update all the cowonly tree roots on disk |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 853 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 854 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
| 855 | struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 856 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 857 | struct btrfs_root *gang[8]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 858 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 859 | int i; |
| 860 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 861 | int err = 0; |
| 862 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 863 | spin_lock(&fs_info->fs_roots_radix_lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 864 | while (1) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 865 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
| 866 | (void **)gang, 0, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 867 | ARRAY_SIZE(gang), |
| 868 | BTRFS_ROOT_TRANS_TAG); |
| 869 | if (ret == 0) |
| 870 | break; |
| 871 | for (i = 0; i < ret; i++) { |
| 872 | root = gang[i]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 873 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
| 874 | (unsigned long)root->root_key.objectid, |
| 875 | BTRFS_ROOT_TRANS_TAG); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 876 | spin_unlock(&fs_info->fs_roots_radix_lock); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 877 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 878 | btrfs_free_log(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 879 | btrfs_update_reloc_root(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 880 | btrfs_orphan_commit_root(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 881 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 882 | btrfs_save_ino_cache(root, trans); |
| 883 | |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 884 | /* see comments in should_cow_block() */ |
| 885 | root->force_cow = 0; |
| 886 | smp_wmb(); |
| 887 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 888 | if (root->commit_root != root->node) { |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 889 | mutex_lock(&root->fs_commit_mutex); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 890 | switch_commit_root(root); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 891 | btrfs_unpin_free_ino(root); |
| 892 | mutex_unlock(&root->fs_commit_mutex); |
| 893 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 894 | btrfs_set_root_node(&root->root_item, |
| 895 | root->node); |
| 896 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 897 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 898 | err = btrfs_update_root(trans, fs_info->tree_root, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 899 | &root->root_key, |
| 900 | &root->root_item); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 901 | spin_lock(&fs_info->fs_roots_radix_lock); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 902 | if (err) |
| 903 | break; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 904 | } |
| 905 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 906 | spin_unlock(&fs_info->fs_roots_radix_lock); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 907 | return err; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 908 | } |
| 909 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 910 | /* |
| 911 | * defrag a given btree. If cacheonly == 1, this won't read from the disk, |
| 912 | * otherwise every leaf in the btree is read and defragged. |
| 913 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 914 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
| 915 | { |
| 916 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 917 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 918 | int ret; |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 919 | unsigned long nr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 920 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 921 | if (xchg(&root->defrag_running, 1)) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 922 | return 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 923 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 924 | while (1) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 925 | trans = btrfs_start_transaction(root, 0); |
| 926 | if (IS_ERR(trans)) |
| 927 | return PTR_ERR(trans); |
| 928 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 929 | ret = btrfs_defrag_leaves(trans, root, cacheonly); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 930 | |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 931 | nr = trans->blocks_used; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 932 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 933 | btrfs_btree_balance_dirty(info->tree_root, nr); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 934 | cond_resched(); |
| 935 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 936 | if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 937 | break; |
| 938 | } |
| 939 | root->defrag_running = 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 940 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 941 | } |
| 942 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 943 | /* |
| 944 | * new snapshots need to be created at a very specific time in the |
| 945 | * transaction commit. This does the actual creation |
| 946 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 947 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 948 | struct btrfs_fs_info *fs_info, |
| 949 | struct btrfs_pending_snapshot *pending) |
| 950 | { |
| 951 | struct btrfs_key key; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 952 | struct btrfs_root_item *new_root_item; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 953 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 954 | struct btrfs_root *root = pending->root; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 955 | struct btrfs_root *parent_root; |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 956 | struct btrfs_block_rsv *rsv; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 957 | struct inode *parent_inode; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 958 | struct dentry *parent; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 959 | struct dentry *dentry; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 960 | struct extent_buffer *tmp; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 961 | struct extent_buffer *old; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 962 | struct timespec cur_time = CURRENT_TIME; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 963 | int ret; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 964 | u64 to_reserve = 0; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 965 | u64 index = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 966 | u64 objectid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 967 | u64 root_flags; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 968 | uuid_le new_uuid; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 969 | |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 970 | rsv = trans->block_rsv; |
| 971 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 972 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
| 973 | if (!new_root_item) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 974 | ret = pending->error = -ENOMEM; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 975 | goto fail; |
| 976 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 977 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 978 | ret = btrfs_find_free_objectid(tree_root, &objectid); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 979 | if (ret) { |
| 980 | pending->error = ret; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 981 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 982 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 983 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 984 | btrfs_reloc_pre_snapshot(trans, pending, &to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 985 | |
| 986 | if (to_reserve > 0) { |
Miao Xie | 62f30c5 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 987 | ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv, |
| 988 | to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 989 | if (ret) { |
| 990 | pending->error = ret; |
| 991 | goto fail; |
| 992 | } |
| 993 | } |
| 994 | |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 995 | ret = btrfs_qgroup_inherit(trans, fs_info, root->root_key.objectid, |
| 996 | objectid, pending->inherit); |
| 997 | kfree(pending->inherit); |
| 998 | if (ret) { |
| 999 | pending->error = ret; |
| 1000 | goto fail; |
| 1001 | } |
| 1002 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1003 | key.objectid = objectid; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1004 | key.offset = (u64)-1; |
| 1005 | key.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1006 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1007 | trans->block_rsv = &pending->block_rsv; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1008 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1009 | dentry = pending->dentry; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 1010 | parent = dget_parent(dentry); |
| 1011 | parent_inode = parent->d_inode; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1012 | parent_root = BTRFS_I(parent_inode)->root; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1013 | record_root_in_trans(trans, parent_root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1014 | |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1015 | /* |
| 1016 | * insert the directory item |
| 1017 | */ |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1018 | ret = btrfs_set_inode_index(parent_inode, &index); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1019 | BUG_ON(ret); /* -ENOMEM */ |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1020 | ret = btrfs_insert_dir_item(trans, parent_root, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1021 | dentry->d_name.name, dentry->d_name.len, |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1022 | parent_inode, &key, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1023 | BTRFS_FT_DIR, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1024 | if (ret == -EEXIST) { |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 1025 | pending->error = -EEXIST; |
| 1026 | dput(parent); |
| 1027 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1028 | } else if (ret) { |
| 1029 | goto abort_trans_dput; |
| 1030 | } |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1031 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1032 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
| 1033 | dentry->d_name.len * 2); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1034 | ret = btrfs_update_inode(trans, parent_root, parent_inode); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1035 | if (ret) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1036 | goto abort_trans_dput; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1037 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1038 | /* |
| 1039 | * pull in the delayed directory update |
| 1040 | * and the delayed inode item |
| 1041 | * otherwise we corrupt the FS during |
| 1042 | * snapshot |
| 1043 | */ |
| 1044 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1045 | if (ret) { /* Transaction aborted */ |
| 1046 | dput(parent); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1047 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1048 | } |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1049 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1050 | record_root_in_trans(trans, root); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1051 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
| 1052 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 1053 | btrfs_check_and_init_root_item(new_root_item); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1054 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1055 | root_flags = btrfs_root_flags(new_root_item); |
| 1056 | if (pending->readonly) |
| 1057 | root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; |
| 1058 | else |
| 1059 | root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; |
| 1060 | btrfs_set_root_flags(new_root_item, root_flags); |
| 1061 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 1062 | btrfs_set_root_generation_v2(new_root_item, |
| 1063 | trans->transid); |
| 1064 | uuid_le_gen(&new_uuid); |
| 1065 | memcpy(new_root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); |
| 1066 | memcpy(new_root_item->parent_uuid, root->root_item.uuid, |
| 1067 | BTRFS_UUID_SIZE); |
| 1068 | new_root_item->otime.sec = cpu_to_le64(cur_time.tv_sec); |
| 1069 | new_root_item->otime.nsec = cpu_to_le64(cur_time.tv_nsec); |
| 1070 | btrfs_set_root_otransid(new_root_item, trans->transid); |
| 1071 | memset(&new_root_item->stime, 0, sizeof(new_root_item->stime)); |
| 1072 | memset(&new_root_item->rtime, 0, sizeof(new_root_item->rtime)); |
| 1073 | btrfs_set_root_stransid(new_root_item, 0); |
| 1074 | btrfs_set_root_rtransid(new_root_item, 0); |
| 1075 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1076 | old = btrfs_lock_root_node(root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1077 | ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1078 | if (ret) { |
| 1079 | btrfs_tree_unlock(old); |
| 1080 | free_extent_buffer(old); |
| 1081 | goto abort_trans_dput; |
| 1082 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1083 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1084 | btrfs_set_lock_blocking(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1085 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1086 | ret = btrfs_copy_root(trans, root, old, &tmp, objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1087 | /* clean up in any case */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1088 | btrfs_tree_unlock(old); |
| 1089 | free_extent_buffer(old); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1090 | if (ret) |
| 1091 | goto abort_trans_dput; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1092 | |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 1093 | /* see comments in should_cow_block() */ |
| 1094 | root->force_cow = 1; |
| 1095 | smp_wmb(); |
| 1096 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1097 | btrfs_set_root_node(new_root_item, tmp); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1098 | /* record when the snapshot was created in key.offset */ |
| 1099 | key.offset = trans->transid; |
| 1100 | ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1101 | btrfs_tree_unlock(tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1102 | free_extent_buffer(tmp); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1103 | if (ret) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1104 | goto abort_trans_dput; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 1105 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1106 | /* |
| 1107 | * insert root back/forward references |
| 1108 | */ |
| 1109 | ret = btrfs_add_root_ref(trans, tree_root, objectid, |
| 1110 | parent_root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1111 | btrfs_ino(parent_inode), index, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1112 | dentry->d_name.name, dentry->d_name.len); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1113 | dput(parent); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1114 | if (ret) |
| 1115 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1116 | |
| 1117 | key.offset = (u64)-1; |
| 1118 | pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1119 | if (IS_ERR(pending->snap)) { |
| 1120 | ret = PTR_ERR(pending->snap); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1121 | goto abort_trans; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1122 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1123 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1124 | ret = btrfs_reloc_post_snapshot(trans, pending); |
| 1125 | if (ret) |
| 1126 | goto abort_trans; |
| 1127 | ret = 0; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1128 | fail: |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1129 | kfree(new_root_item); |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1130 | trans->block_rsv = rsv; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1131 | btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1132 | return ret; |
| 1133 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1134 | abort_trans_dput: |
| 1135 | dput(parent); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1136 | abort_trans: |
| 1137 | btrfs_abort_transaction(trans, root, ret); |
| 1138 | goto fail; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1139 | } |
| 1140 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1141 | /* |
| 1142 | * create all the snapshots we've scheduled for creation |
| 1143 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1144 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
| 1145 | struct btrfs_fs_info *fs_info) |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1146 | { |
| 1147 | struct btrfs_pending_snapshot *pending; |
| 1148 | struct list_head *head = &trans->transaction->pending_snapshots; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1149 | |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 1150 | list_for_each_entry(pending, head, list) |
| 1151 | create_pending_snapshot(trans, fs_info, pending); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1152 | return 0; |
| 1153 | } |
| 1154 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1155 | static void update_super_roots(struct btrfs_root *root) |
| 1156 | { |
| 1157 | struct btrfs_root_item *root_item; |
| 1158 | struct btrfs_super_block *super; |
| 1159 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1160 | super = root->fs_info->super_copy; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1161 | |
| 1162 | root_item = &root->fs_info->chunk_root->root_item; |
| 1163 | super->chunk_root = root_item->bytenr; |
| 1164 | super->chunk_root_generation = root_item->generation; |
| 1165 | super->chunk_root_level = root_item->level; |
| 1166 | |
| 1167 | root_item = &root->fs_info->tree_root->root_item; |
| 1168 | super->root = root_item->bytenr; |
| 1169 | super->generation = root_item->generation; |
| 1170 | super->root_level = root_item->level; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 1171 | if (btrfs_test_opt(root, SPACE_CACHE)) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 1172 | super->cache_generation = root_item->generation; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1173 | } |
| 1174 | |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1175 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
| 1176 | { |
| 1177 | int ret = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1178 | spin_lock(&info->trans_lock); |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1179 | if (info->running_transaction) |
| 1180 | ret = info->running_transaction->in_commit; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1181 | spin_unlock(&info->trans_lock); |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1182 | return ret; |
| 1183 | } |
| 1184 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1185 | int btrfs_transaction_blocked(struct btrfs_fs_info *info) |
| 1186 | { |
| 1187 | int ret = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1188 | spin_lock(&info->trans_lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1189 | if (info->running_transaction) |
| 1190 | ret = info->running_transaction->blocked; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1191 | spin_unlock(&info->trans_lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1192 | return ret; |
| 1193 | } |
| 1194 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1195 | /* |
| 1196 | * wait for the current transaction commit to start and block subsequent |
| 1197 | * transaction joins |
| 1198 | */ |
| 1199 | static void wait_current_trans_commit_start(struct btrfs_root *root, |
| 1200 | struct btrfs_transaction *trans) |
| 1201 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 1202 | wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1203 | } |
| 1204 | |
| 1205 | /* |
| 1206 | * wait for the current transaction to start and then become unblocked. |
| 1207 | * caller holds ref. |
| 1208 | */ |
| 1209 | static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, |
| 1210 | struct btrfs_transaction *trans) |
| 1211 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 1212 | wait_event(root->fs_info->transaction_wait, |
| 1213 | trans->commit_done || (trans->in_commit && !trans->blocked)); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1214 | } |
| 1215 | |
| 1216 | /* |
| 1217 | * commit transactions asynchronously. once btrfs_commit_transaction_async |
| 1218 | * returns, any subsequent transaction will not be allowed to join. |
| 1219 | */ |
| 1220 | struct btrfs_async_commit { |
| 1221 | struct btrfs_trans_handle *newtrans; |
| 1222 | struct btrfs_root *root; |
| 1223 | struct delayed_work work; |
| 1224 | }; |
| 1225 | |
| 1226 | static void do_async_commit(struct work_struct *work) |
| 1227 | { |
| 1228 | struct btrfs_async_commit *ac = |
| 1229 | container_of(work, struct btrfs_async_commit, work.work); |
| 1230 | |
| 1231 | btrfs_commit_transaction(ac->newtrans, ac->root); |
| 1232 | kfree(ac); |
| 1233 | } |
| 1234 | |
| 1235 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
| 1236 | struct btrfs_root *root, |
| 1237 | int wait_for_unblock) |
| 1238 | { |
| 1239 | struct btrfs_async_commit *ac; |
| 1240 | struct btrfs_transaction *cur_trans; |
| 1241 | |
| 1242 | ac = kmalloc(sizeof(*ac), GFP_NOFS); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 1243 | if (!ac) |
| 1244 | return -ENOMEM; |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1245 | |
| 1246 | INIT_DELAYED_WORK(&ac->work, do_async_commit); |
| 1247 | ac->root = root; |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1248 | ac->newtrans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1249 | if (IS_ERR(ac->newtrans)) { |
| 1250 | int err = PTR_ERR(ac->newtrans); |
| 1251 | kfree(ac); |
| 1252 | return err; |
| 1253 | } |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1254 | |
| 1255 | /* take transaction reference */ |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1256 | cur_trans = trans->transaction; |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1257 | atomic_inc(&cur_trans->use_count); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1258 | |
| 1259 | btrfs_end_transaction(trans, root); |
| 1260 | schedule_delayed_work(&ac->work, 0); |
| 1261 | |
| 1262 | /* wait for transaction to start and unblock */ |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1263 | if (wait_for_unblock) |
| 1264 | wait_current_trans_commit_start_and_unblock(root, cur_trans); |
| 1265 | else |
| 1266 | wait_current_trans_commit_start(root, cur_trans); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1267 | |
Sage Weil | 38e8805 | 2011-06-10 18:43:13 +0000 | [diff] [blame] | 1268 | if (current->journal_info == trans) |
| 1269 | current->journal_info = NULL; |
| 1270 | |
| 1271 | put_transaction(cur_trans); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1272 | return 0; |
| 1273 | } |
| 1274 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1275 | |
| 1276 | static void cleanup_transaction(struct btrfs_trans_handle *trans, |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 1277 | struct btrfs_root *root, int err) |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1278 | { |
| 1279 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 1280 | |
| 1281 | WARN_ON(trans->use_count > 1); |
| 1282 | |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 1283 | btrfs_abort_transaction(trans, root, err); |
| 1284 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1285 | spin_lock(&root->fs_info->trans_lock); |
| 1286 | list_del_init(&cur_trans->list); |
Josef Bacik | d7096fc | 2012-05-31 15:49:57 -0400 | [diff] [blame] | 1287 | if (cur_trans == root->fs_info->running_transaction) { |
| 1288 | root->fs_info->running_transaction = NULL; |
| 1289 | root->fs_info->trans_no_join = 0; |
| 1290 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1291 | spin_unlock(&root->fs_info->trans_lock); |
| 1292 | |
| 1293 | btrfs_cleanup_one_transaction(trans->transaction, root); |
| 1294 | |
| 1295 | put_transaction(cur_trans); |
| 1296 | put_transaction(cur_trans); |
| 1297 | |
| 1298 | trace_btrfs_transaction_commit(root); |
| 1299 | |
| 1300 | btrfs_scrub_continue(root); |
| 1301 | |
| 1302 | if (current->journal_info == trans) |
| 1303 | current->journal_info = NULL; |
| 1304 | |
| 1305 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
| 1306 | } |
| 1307 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1308 | /* |
| 1309 | * btrfs_transaction state sequence: |
| 1310 | * in_commit = 0, blocked = 0 (initial) |
| 1311 | * in_commit = 1, blocked = 1 |
| 1312 | * blocked = 0 |
| 1313 | * commit_done = 1 |
| 1314 | */ |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1315 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| 1316 | struct btrfs_root *root) |
| 1317 | { |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1318 | unsigned long joined = 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1319 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1320 | struct btrfs_transaction *prev_trans = NULL; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1321 | DEFINE_WAIT(wait); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1322 | int ret = -EIO; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1323 | int should_grow = 0; |
| 1324 | unsigned long now = get_seconds(); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 1325 | int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1326 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1327 | btrfs_run_ordered_operations(root, 0); |
| 1328 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1329 | if (cur_trans->aborted) |
| 1330 | goto cleanup_transaction; |
| 1331 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1332 | /* make a pass through all the delayed refs we have so far |
| 1333 | * any runnings procs may add more while we are here |
| 1334 | */ |
| 1335 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1336 | if (ret) |
| 1337 | goto cleanup_transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1338 | |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 1339 | btrfs_trans_release_metadata(trans, root); |
| 1340 | trans->block_rsv = NULL; |
| 1341 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1342 | cur_trans = trans->transaction; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1343 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1344 | /* |
| 1345 | * set the flushing flag so procs in this transaction have to |
| 1346 | * start sending their work down. |
| 1347 | */ |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1348 | cur_trans->delayed_refs.flushing = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1349 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1350 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1351 | if (ret) |
| 1352 | goto cleanup_transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1353 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1354 | spin_lock(&cur_trans->commit_lock); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1355 | if (cur_trans->in_commit) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1356 | spin_unlock(&cur_trans->commit_lock); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1357 | atomic_inc(&cur_trans->use_count); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1358 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1359 | |
Li Zefan | b9c8300 | 2011-07-14 03:17:14 +0000 | [diff] [blame] | 1360 | wait_for_commit(root, cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1361 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1362 | put_transaction(cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1363 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1364 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1365 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1366 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1367 | trans->transaction->in_commit = 1; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1368 | trans->transaction->blocked = 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1369 | spin_unlock(&cur_trans->commit_lock); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1370 | wake_up(&root->fs_info->transaction_blocked_wait); |
| 1371 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1372 | spin_lock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1373 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
| 1374 | prev_trans = list_entry(cur_trans->list.prev, |
| 1375 | struct btrfs_transaction, list); |
| 1376 | if (!prev_trans->commit_done) { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1377 | atomic_inc(&prev_trans->use_count); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1378 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1379 | |
| 1380 | wait_for_commit(root, prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1381 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1382 | put_transaction(prev_trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1383 | } else { |
| 1384 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1385 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1386 | } else { |
| 1387 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1388 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1389 | |
Chris Mason | e39e64a | 2012-07-23 15:23:45 -0400 | [diff] [blame] | 1390 | if (!btrfs_test_opt(root, SSD) && |
| 1391 | (now < cur_trans->start_time || now - cur_trans->start_time < 1)) |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1392 | should_grow = 1; |
| 1393 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1394 | do { |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1395 | int snap_pending = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1396 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1397 | joined = cur_trans->num_joined; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1398 | if (!list_empty(&trans->transaction->pending_snapshots)) |
| 1399 | snap_pending = 1; |
| 1400 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1401 | WARN_ON(cur_trans != trans->transaction); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1402 | |
Sage Weil | 0bdb1db | 2010-02-19 14:13:50 -0800 | [diff] [blame] | 1403 | if (flush_on_commit || snap_pending) { |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1404 | btrfs_start_delalloc_inodes(root, 1); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1405 | btrfs_wait_ordered_extents(root, 0, 1); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1406 | } |
| 1407 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1408 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1409 | if (ret) |
| 1410 | goto cleanup_transaction; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1411 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1412 | /* |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 1413 | * running the delayed items may have added new refs. account |
| 1414 | * them now so that they hinder processing of more delayed refs |
| 1415 | * as little as possible. |
| 1416 | */ |
| 1417 | btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info); |
| 1418 | |
| 1419 | /* |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1420 | * rename don't use btrfs_join_transaction, so, once we |
| 1421 | * set the transaction to blocked above, we aren't going |
| 1422 | * to get any new ordered operations. We can safely run |
| 1423 | * it here and no for sure that nothing new will be added |
| 1424 | * to the list |
| 1425 | */ |
| 1426 | btrfs_run_ordered_operations(root, 1); |
| 1427 | |
Chris Mason | ed3b3d314 | 2010-05-25 10:12:41 -0400 | [diff] [blame] | 1428 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
| 1429 | TASK_UNINTERRUPTIBLE); |
| 1430 | |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1431 | if (atomic_read(&cur_trans->num_writers) > 1) |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1432 | schedule_timeout(MAX_SCHEDULE_TIMEOUT); |
| 1433 | else if (should_grow) |
| 1434 | schedule_timeout(1); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1435 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1436 | finish_wait(&cur_trans->writer_wait, &wait); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1437 | } while (atomic_read(&cur_trans->num_writers) > 1 || |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1438 | (should_grow && cur_trans->num_joined != joined)); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1439 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1440 | /* |
Josef Bacik | ed0ca14 | 2011-06-14 16:22:15 -0400 | [diff] [blame] | 1441 | * Ok now we need to make sure to block out any other joins while we |
| 1442 | * commit the transaction. We could have started a join before setting |
| 1443 | * no_join so make sure to wait for num_writers to == 1 again. |
| 1444 | */ |
| 1445 | spin_lock(&root->fs_info->trans_lock); |
| 1446 | root->fs_info->trans_no_join = 1; |
| 1447 | spin_unlock(&root->fs_info->trans_lock); |
| 1448 | wait_event(cur_trans->writer_wait, |
| 1449 | atomic_read(&cur_trans->num_writers) == 1); |
| 1450 | |
Chris Mason | e038dca | 2011-06-17 14:16:13 -0400 | [diff] [blame] | 1451 | /* |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1452 | * the reloc mutex makes sure that we stop |
| 1453 | * the balancing code from coming in and moving |
| 1454 | * extents around in the middle of the commit |
| 1455 | */ |
| 1456 | mutex_lock(&root->fs_info->reloc_mutex); |
| 1457 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1458 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1459 | if (ret) { |
| 1460 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 1461 | goto cleanup_transaction; |
| 1462 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1463 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1464 | ret = create_pending_snapshots(trans, root->fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1465 | if (ret) { |
| 1466 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 1467 | goto cleanup_transaction; |
| 1468 | } |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1469 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1470 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1471 | if (ret) { |
| 1472 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 1473 | goto cleanup_transaction; |
| 1474 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1475 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1476 | /* |
| 1477 | * make sure none of the code above managed to slip in a |
| 1478 | * delayed item |
| 1479 | */ |
| 1480 | btrfs_assert_delayed_root_empty(root); |
| 1481 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1482 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1483 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1484 | btrfs_scrub_pause(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1485 | /* btrfs_commit_tree_roots is responsible for getting the |
| 1486 | * various roots consistent with each other. Every pointer |
| 1487 | * in the tree of tree roots has to point to the most up to date |
| 1488 | * root for every subvolume and other tree. So, we have to keep |
| 1489 | * the tree logging code from jumping in and changing any |
| 1490 | * of the trees. |
| 1491 | * |
| 1492 | * At this point in the commit, there can't be any tree-log |
| 1493 | * writers, but a little lower down we drop the trans mutex |
| 1494 | * and let new people in. By holding the tree_log_mutex |
| 1495 | * from now until after the super is written, we avoid races |
| 1496 | * with the tree-log code. |
| 1497 | */ |
| 1498 | mutex_lock(&root->fs_info->tree_log_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1499 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1500 | ret = commit_fs_roots(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1501 | if (ret) { |
| 1502 | mutex_unlock(&root->fs_info->tree_log_mutex); |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 1503 | mutex_unlock(&root->fs_info->reloc_mutex); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1504 | goto cleanup_transaction; |
| 1505 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1506 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1507 | /* 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] | 1508 | * safe to free the root of tree log roots |
| 1509 | */ |
| 1510 | btrfs_free_log_root_tree(trans, root->fs_info); |
| 1511 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1512 | ret = commit_cowonly_roots(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1513 | if (ret) { |
| 1514 | mutex_unlock(&root->fs_info->tree_log_mutex); |
David Sterba | 871383b | 2012-04-02 18:31:37 +0200 | [diff] [blame] | 1515 | mutex_unlock(&root->fs_info->reloc_mutex); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1516 | goto cleanup_transaction; |
| 1517 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1518 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1519 | btrfs_prepare_extent_commit(trans, root); |
| 1520 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1521 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1522 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1523 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, |
| 1524 | root->fs_info->tree_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1525 | switch_commit_root(root->fs_info->tree_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1526 | |
| 1527 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, |
| 1528 | root->fs_info->chunk_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1529 | switch_commit_root(root->fs_info->chunk_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1530 | |
Jan Schmidt | edf3927 | 2012-06-28 18:04:55 +0200 | [diff] [blame] | 1531 | assert_qgroups_uptodate(trans); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1532 | update_super_roots(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1533 | |
| 1534 | if (!root->fs_info->log_root_recovering) { |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1535 | btrfs_set_super_log_root(root->fs_info->super_copy, 0); |
| 1536 | btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1537 | } |
| 1538 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1539 | memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, |
| 1540 | sizeof(*root->fs_info->super_copy)); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1541 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1542 | trans->transaction->blocked = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1543 | spin_lock(&root->fs_info->trans_lock); |
| 1544 | root->fs_info->running_transaction = NULL; |
| 1545 | root->fs_info->trans_no_join = 0; |
| 1546 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1547 | mutex_unlock(&root->fs_info->reloc_mutex); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1548 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1549 | wake_up(&root->fs_info->transaction_wait); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1550 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1551 | ret = btrfs_write_and_wait_transaction(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1552 | if (ret) { |
| 1553 | btrfs_error(root->fs_info, ret, |
| 1554 | "Error while writing out transaction."); |
| 1555 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1556 | goto cleanup_transaction; |
| 1557 | } |
| 1558 | |
| 1559 | ret = write_ctree_super(trans, root, 0); |
| 1560 | if (ret) { |
| 1561 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1562 | goto cleanup_transaction; |
| 1563 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1564 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1565 | /* |
| 1566 | * the super is written, we can safely allow the tree-loggers |
| 1567 | * to go about their business |
| 1568 | */ |
| 1569 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1570 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1571 | btrfs_finish_extent_commit(trans, root); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1572 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1573 | cur_trans->commit_done = 1; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1574 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1575 | root->fs_info->last_trans_committed = cur_trans->transid; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1576 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1577 | wake_up(&cur_trans->commit_wait); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1578 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1579 | spin_lock(&root->fs_info->trans_lock); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1580 | list_del_init(&cur_trans->list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1581 | spin_unlock(&root->fs_info->trans_lock); |
| 1582 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1583 | put_transaction(cur_trans); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1584 | put_transaction(cur_trans); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1585 | |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 1586 | sb_end_intwrite(root->fs_info->sb); |
| 1587 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 1588 | trace_btrfs_transaction_commit(root); |
| 1589 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1590 | btrfs_scrub_continue(root); |
| 1591 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1592 | if (current->journal_info == trans) |
| 1593 | current->journal_info = NULL; |
| 1594 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1595 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1596 | |
| 1597 | if (current != root->fs_info->transaction_kthread) |
| 1598 | btrfs_run_delayed_iputs(root); |
| 1599 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1600 | return ret; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1601 | |
| 1602 | cleanup_transaction: |
Josef Bacik | 0e72110 | 2012-06-26 16:13:18 -0400 | [diff] [blame] | 1603 | btrfs_trans_release_metadata(trans, root); |
| 1604 | trans->block_rsv = NULL; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1605 | btrfs_printk(root->fs_info, "Skipping commit of aborted transaction.\n"); |
| 1606 | // WARN_ON(1); |
| 1607 | if (current->journal_info == trans) |
| 1608 | current->journal_info = NULL; |
Josef Bacik | 7b8b92a | 2012-05-31 15:52:43 -0400 | [diff] [blame] | 1609 | cleanup_transaction(trans, root, ret); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1610 | |
| 1611 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1612 | } |
| 1613 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1614 | /* |
| 1615 | * interface function to delete all the snapshots we have scheduled for deletion |
| 1616 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1617 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
| 1618 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1619 | LIST_HEAD(list); |
| 1620 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1621 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1622 | spin_lock(&fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1623 | list_splice_init(&fs_info->dead_roots, &list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1624 | spin_unlock(&fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1625 | |
| 1626 | while (!list_empty(&list)) { |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 1627 | int ret; |
| 1628 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1629 | root = list_entry(list.next, struct btrfs_root, root_list); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1630 | list_del(&root->root_list); |
| 1631 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1632 | btrfs_kill_all_delayed_nodes(root); |
| 1633 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1634 | if (btrfs_header_backref_rev(root->node) < |
| 1635 | BTRFS_MIXED_BACKREF_REV) |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 1636 | ret = btrfs_drop_snapshot(root, NULL, 0, 0); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1637 | else |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 1638 | ret =btrfs_drop_snapshot(root, NULL, 1, 0); |
| 1639 | BUG_ON(ret < 0); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1640 | } |
| 1641 | return 0; |
| 1642 | } |