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> |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 25 | #include "ctree.h" |
| 26 | #include "disk-io.h" |
| 27 | #include "transaction.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 28 | #include "locking.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 29 | #include "tree-log.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 30 | #include "inode-map.h" |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 31 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 32 | #define BTRFS_ROOT_TRANS_TAG 0 |
| 33 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 34 | void put_transaction(struct btrfs_transaction *transaction) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 35 | { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 36 | WARN_ON(atomic_read(&transaction->use_count) == 0); |
| 37 | if (atomic_dec_and_test(&transaction->use_count)) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 38 | BUG_ON(!list_empty(&transaction->list)); |
Arne Jansen | 00f04b8 | 2011-09-14 12:37:00 +0200 | [diff] [blame] | 39 | WARN_ON(transaction->delayed_refs.root.rb_node); |
| 40 | WARN_ON(!list_empty(&transaction->delayed_refs.seq_head)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 41 | memset(transaction, 0, sizeof(*transaction)); |
| 42 | kmem_cache_free(btrfs_transaction_cachep, transaction); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 43 | } |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 44 | } |
| 45 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 46 | static noinline void switch_commit_root(struct btrfs_root *root) |
| 47 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 48 | free_extent_buffer(root->commit_root); |
| 49 | root->commit_root = btrfs_root_node(root); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 50 | } |
| 51 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 52 | /* |
| 53 | * either allocate a new transaction or hop into the existing one |
| 54 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 55 | static noinline int join_transaction(struct btrfs_root *root, int nofail) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 56 | { |
| 57 | struct btrfs_transaction *cur_trans; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 58 | |
| 59 | spin_lock(&root->fs_info->trans_lock); |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 60 | loop: |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 61 | /* The file system has been taken offline. No new transactions. */ |
| 62 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 63 | spin_unlock(&root->fs_info->trans_lock); |
| 64 | return -EROFS; |
| 65 | } |
| 66 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 67 | if (root->fs_info->trans_no_join) { |
| 68 | if (!nofail) { |
| 69 | spin_unlock(&root->fs_info->trans_lock); |
| 70 | return -EBUSY; |
| 71 | } |
| 72 | } |
| 73 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 74 | cur_trans = root->fs_info->running_transaction; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 75 | if (cur_trans) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 76 | if (cur_trans->aborted) |
| 77 | return cur_trans->aborted; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 78 | atomic_inc(&cur_trans->use_count); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 79 | atomic_inc(&cur_trans->num_writers); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 80 | cur_trans->num_joined++; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 81 | spin_unlock(&root->fs_info->trans_lock); |
| 82 | return 0; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 83 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 84 | spin_unlock(&root->fs_info->trans_lock); |
| 85 | |
| 86 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); |
| 87 | if (!cur_trans) |
| 88 | return -ENOMEM; |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 89 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 90 | spin_lock(&root->fs_info->trans_lock); |
| 91 | if (root->fs_info->running_transaction) { |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 92 | /* |
| 93 | * someone started a transaction after we unlocked. Make sure |
| 94 | * to redo the trans_no_join checks above |
| 95 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 96 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
| 97 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 98 | goto loop; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 99 | } |
Chris Mason | d43317d | 2011-11-06 03:26:19 -0500 | [diff] [blame] | 100 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 101 | atomic_set(&cur_trans->num_writers, 1); |
| 102 | cur_trans->num_joined = 0; |
| 103 | init_waitqueue_head(&cur_trans->writer_wait); |
| 104 | init_waitqueue_head(&cur_trans->commit_wait); |
| 105 | cur_trans->in_commit = 0; |
| 106 | cur_trans->blocked = 0; |
| 107 | /* |
| 108 | * One for this trans handle, one so it will live on until we |
| 109 | * commit the transaction. |
| 110 | */ |
| 111 | atomic_set(&cur_trans->use_count, 2); |
| 112 | cur_trans->commit_done = 0; |
| 113 | cur_trans->start_time = get_seconds(); |
| 114 | |
| 115 | cur_trans->delayed_refs.root = RB_ROOT; |
| 116 | cur_trans->delayed_refs.num_entries = 0; |
| 117 | cur_trans->delayed_refs.num_heads_ready = 0; |
| 118 | cur_trans->delayed_refs.num_heads = 0; |
| 119 | cur_trans->delayed_refs.flushing = 0; |
| 120 | cur_trans->delayed_refs.run_delayed_start = 0; |
Arne Jansen | 00f04b8 | 2011-09-14 12:37:00 +0200 | [diff] [blame] | 121 | cur_trans->delayed_refs.seq = 1; |
Jan Schmidt | a168650 | 2011-12-12 16:10:07 +0100 | [diff] [blame] | 122 | init_waitqueue_head(&cur_trans->delayed_refs.seq_wait); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 123 | spin_lock_init(&cur_trans->commit_lock); |
| 124 | spin_lock_init(&cur_trans->delayed_refs.lock); |
Arne Jansen | 00f04b8 | 2011-09-14 12:37:00 +0200 | [diff] [blame] | 125 | INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 126 | |
| 127 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
| 128 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
| 129 | extent_io_tree_init(&cur_trans->dirty_pages, |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 130 | root->fs_info->btree_inode->i_mapping); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 131 | root->fs_info->generation++; |
| 132 | cur_trans->transid = root->fs_info->generation; |
| 133 | root->fs_info->running_transaction = cur_trans; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 134 | cur_trans->aborted = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 135 | spin_unlock(&root->fs_info->trans_lock); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 136 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 137 | return 0; |
| 138 | } |
| 139 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 140 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 141 | * this does all the record keeping required to make sure that a reference |
| 142 | * counted root is properly recorded in a given transaction. This is required |
| 143 | * to make sure the old root from before we joined the transaction is deleted |
| 144 | * when the transaction commits |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 145 | */ |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 146 | static int record_root_in_trans(struct btrfs_trans_handle *trans, |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 147 | struct btrfs_root *root) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 148 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 149 | if (root->ref_cows && root->last_trans < trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 150 | WARN_ON(root == root->fs_info->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 151 | WARN_ON(root->commit_root != root->node); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 152 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 153 | /* |
| 154 | * see below for in_trans_setup usage rules |
| 155 | * we have the reloc mutex held now, so there |
| 156 | * is only one writer in this function |
| 157 | */ |
| 158 | root->in_trans_setup = 1; |
| 159 | |
| 160 | /* make sure readers find in_trans_setup before |
| 161 | * they find our root->last_trans update |
| 162 | */ |
| 163 | smp_wmb(); |
| 164 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 165 | spin_lock(&root->fs_info->fs_roots_radix_lock); |
| 166 | if (root->last_trans == trans->transid) { |
| 167 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
| 168 | return 0; |
| 169 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 170 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, |
| 171 | (unsigned long)root->root_key.objectid, |
| 172 | BTRFS_ROOT_TRANS_TAG); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 173 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 174 | root->last_trans = trans->transid; |
| 175 | |
| 176 | /* this is pretty tricky. We don't want to |
| 177 | * take the relocation lock in btrfs_record_root_in_trans |
| 178 | * unless we're really doing the first setup for this root in |
| 179 | * this transaction. |
| 180 | * |
| 181 | * Normally we'd use root->last_trans as a flag to decide |
| 182 | * if we want to take the expensive mutex. |
| 183 | * |
| 184 | * But, we have to set root->last_trans before we |
| 185 | * init the relocation root, otherwise, we trip over warnings |
| 186 | * in ctree.c. The solution used here is to flag ourselves |
| 187 | * with root->in_trans_setup. When this is 1, we're still |
| 188 | * fixing up the reloc trees and everyone must wait. |
| 189 | * |
| 190 | * When this is zero, they can trust root->last_trans and fly |
| 191 | * through btrfs_record_root_in_trans without having to take the |
| 192 | * lock. smp_wmb() makes sure that all the writes above are |
| 193 | * done before we pop in the zero below |
| 194 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 195 | btrfs_init_reloc_root(trans, root); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 196 | smp_wmb(); |
| 197 | root->in_trans_setup = 0; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 202 | |
| 203 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
| 204 | struct btrfs_root *root) |
| 205 | { |
| 206 | if (!root->ref_cows) |
| 207 | return 0; |
| 208 | |
| 209 | /* |
| 210 | * see record_root_in_trans for comments about in_trans_setup usage |
| 211 | * and barriers |
| 212 | */ |
| 213 | smp_rmb(); |
| 214 | if (root->last_trans == trans->transid && |
| 215 | !root->in_trans_setup) |
| 216 | return 0; |
| 217 | |
| 218 | mutex_lock(&root->fs_info->reloc_mutex); |
| 219 | record_root_in_trans(trans, root); |
| 220 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 225 | /* wait for commit against the current transaction to become unblocked |
| 226 | * when this is done, it is safe to start a new transaction, but the current |
| 227 | * transaction might not be fully on disk. |
| 228 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 229 | static void wait_current_trans(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 230 | { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 231 | struct btrfs_transaction *cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 232 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 233 | spin_lock(&root->fs_info->trans_lock); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 234 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 235 | if (cur_trans && cur_trans->blocked) { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 236 | atomic_inc(&cur_trans->use_count); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 237 | spin_unlock(&root->fs_info->trans_lock); |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 238 | |
| 239 | wait_event(root->fs_info->transaction_wait, |
| 240 | !cur_trans->blocked); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 241 | put_transaction(cur_trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 242 | } else { |
| 243 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 244 | } |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 245 | } |
| 246 | |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 247 | enum btrfs_trans_type { |
| 248 | TRANS_START, |
| 249 | TRANS_JOIN, |
| 250 | TRANS_USERSPACE, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 251 | TRANS_JOIN_NOLOCK, |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 252 | }; |
| 253 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 254 | static int may_wait_transaction(struct btrfs_root *root, int type) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 255 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 256 | if (root->fs_info->log_root_recovering) |
| 257 | return 0; |
| 258 | |
| 259 | if (type == TRANS_USERSPACE) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 260 | return 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 261 | |
| 262 | if (type == TRANS_START && |
| 263 | !atomic_read(&root->fs_info->open_ioctl_trans)) |
| 264 | return 1; |
| 265 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, |
| 270 | u64 num_items, int type) |
| 271 | { |
| 272 | struct btrfs_trans_handle *h; |
| 273 | struct btrfs_transaction *cur_trans; |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 274 | u64 num_bytes = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 275 | int ret; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 276 | |
| 277 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) |
| 278 | return ERR_PTR(-EROFS); |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 279 | |
| 280 | if (current->journal_info) { |
| 281 | WARN_ON(type != TRANS_JOIN && type != TRANS_JOIN_NOLOCK); |
| 282 | h = current->journal_info; |
| 283 | h->use_count++; |
| 284 | h->orig_rsv = h->block_rsv; |
| 285 | h->block_rsv = NULL; |
| 286 | goto got_it; |
| 287 | } |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 288 | |
| 289 | /* |
| 290 | * Do the reservation before we join the transaction so we can do all |
| 291 | * the appropriate flushing if need be. |
| 292 | */ |
| 293 | if (num_items > 0 && root != root->fs_info->chunk_root) { |
| 294 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); |
Josef Bacik | 4a92b1b | 2011-08-30 12:34:28 -0400 | [diff] [blame] | 295 | ret = btrfs_block_rsv_add(root, |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 296 | &root->fs_info->trans_block_rsv, |
| 297 | num_bytes); |
| 298 | if (ret) |
| 299 | return ERR_PTR(ret); |
| 300 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 301 | again: |
| 302 | h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); |
| 303 | if (!h) |
| 304 | return ERR_PTR(-ENOMEM); |
| 305 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 306 | if (may_wait_transaction(root, type)) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 307 | wait_current_trans(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 308 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 309 | do { |
| 310 | ret = join_transaction(root, type == TRANS_JOIN_NOLOCK); |
| 311 | if (ret == -EBUSY) |
| 312 | wait_current_trans(root); |
| 313 | } while (ret == -EBUSY); |
| 314 | |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 315 | if (ret < 0) { |
Yoshinori Sano | 6e8df2a | 2011-04-03 12:31:28 +0000 | [diff] [blame] | 316 | kmem_cache_free(btrfs_trans_handle_cachep, h); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 317 | return ERR_PTR(ret); |
| 318 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 319 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 320 | cur_trans = root->fs_info->running_transaction; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 321 | |
| 322 | h->transid = cur_trans->transid; |
| 323 | h->transaction = cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 324 | h->blocks_used = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 325 | h->bytes_reserved = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 326 | h->delayed_ref_updates = 0; |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 327 | h->use_count = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 328 | h->block_rsv = NULL; |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 329 | h->orig_rsv = NULL; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 330 | h->aborted = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 331 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 332 | smp_mb(); |
| 333 | if (cur_trans->blocked && may_wait_transaction(root, type)) { |
| 334 | btrfs_commit_transaction(h, root); |
| 335 | goto again; |
| 336 | } |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 337 | |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 338 | if (num_bytes) { |
Josef Bacik | 8c2a3ca | 2012-01-10 10:31:31 -0500 | [diff] [blame] | 339 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
Liu Bo | 2bcc032 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 340 | h->transid, num_bytes, 1); |
Josef Bacik | b500994 | 2011-06-07 15:07:51 -0400 | [diff] [blame] | 341 | h->block_rsv = &root->fs_info->trans_block_rsv; |
| 342 | h->bytes_reserved = num_bytes; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 345 | got_it: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 346 | btrfs_record_root_in_trans(h, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 347 | |
| 348 | if (!current->journal_info && type != TRANS_USERSPACE) |
| 349 | current->journal_info = h; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 350 | return h; |
| 351 | } |
| 352 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 353 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 354 | int num_items) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 355 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 356 | return start_transaction(root, num_items, TRANS_START); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 357 | } |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 358 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 359 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 360 | return start_transaction(root, 0, TRANS_JOIN); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 361 | } |
| 362 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 363 | struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 364 | { |
| 365 | return start_transaction(root, 0, TRANS_JOIN_NOLOCK); |
| 366 | } |
| 367 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 368 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 369 | { |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 370 | return start_transaction(root, 0, TRANS_USERSPACE); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 371 | } |
| 372 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 373 | /* wait for a transaction commit to be fully complete */ |
Li Zefan | b9c8300 | 2011-07-14 03:17:14 +0000 | [diff] [blame] | 374 | static noinline void wait_for_commit(struct btrfs_root *root, |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 375 | struct btrfs_transaction *commit) |
| 376 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 377 | wait_event(commit->commit_wait, commit->commit_done); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 378 | } |
| 379 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 380 | int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) |
| 381 | { |
| 382 | struct btrfs_transaction *cur_trans = NULL, *t; |
| 383 | int ret; |
| 384 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 385 | ret = 0; |
| 386 | if (transid) { |
| 387 | if (transid <= root->fs_info->last_trans_committed) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 388 | goto out; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 389 | |
| 390 | /* find specified transaction */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 391 | spin_lock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 392 | list_for_each_entry(t, &root->fs_info->trans_list, list) { |
| 393 | if (t->transid == transid) { |
| 394 | cur_trans = t; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 395 | atomic_inc(&cur_trans->use_count); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 396 | break; |
| 397 | } |
| 398 | if (t->transid > transid) |
| 399 | break; |
| 400 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 401 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 402 | ret = -EINVAL; |
| 403 | if (!cur_trans) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 404 | goto out; /* bad transid */ |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 405 | } else { |
| 406 | /* find newest transaction that is committing | committed */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 407 | spin_lock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 408 | list_for_each_entry_reverse(t, &root->fs_info->trans_list, |
| 409 | list) { |
| 410 | if (t->in_commit) { |
| 411 | if (t->commit_done) |
Josef Bacik | 3473f3c | 2011-06-09 10:15:17 -0400 | [diff] [blame] | 412 | break; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 413 | cur_trans = t; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 414 | atomic_inc(&cur_trans->use_count); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 415 | break; |
| 416 | } |
| 417 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 418 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 419 | if (!cur_trans) |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 420 | goto out; /* nothing committing|committed */ |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 421 | } |
| 422 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 423 | wait_for_commit(root, cur_trans); |
| 424 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 425 | put_transaction(cur_trans); |
| 426 | ret = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 427 | out: |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 428 | return ret; |
| 429 | } |
| 430 | |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 431 | void btrfs_throttle(struct btrfs_root *root) |
| 432 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 433 | if (!atomic_read(&root->fs_info->open_ioctl_trans)) |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 434 | wait_current_trans(root); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 435 | } |
| 436 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 437 | static int should_end_transaction(struct btrfs_trans_handle *trans, |
| 438 | struct btrfs_root *root) |
| 439 | { |
| 440 | int ret; |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 441 | |
| 442 | 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] | 443 | return ret ? 1 : 0; |
| 444 | } |
| 445 | |
| 446 | int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, |
| 447 | struct btrfs_root *root) |
| 448 | { |
| 449 | struct btrfs_transaction *cur_trans = trans->transaction; |
Josef Bacik | 9c8d86d | 2011-09-19 11:58:54 -0400 | [diff] [blame] | 450 | struct btrfs_block_rsv *rsv = trans->block_rsv; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 451 | int updates; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 452 | int err; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 453 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 454 | smp_mb(); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 455 | if (cur_trans->blocked || cur_trans->delayed_refs.flushing) |
| 456 | return 1; |
| 457 | |
Josef Bacik | 9c8d86d | 2011-09-19 11:58:54 -0400 | [diff] [blame] | 458 | /* |
| 459 | * We need to do this in case we're deleting csums so the global block |
| 460 | * rsv get's used instead of the csum block rsv. |
| 461 | */ |
| 462 | trans->block_rsv = NULL; |
| 463 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 464 | updates = trans->delayed_ref_updates; |
| 465 | trans->delayed_ref_updates = 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 466 | if (updates) { |
| 467 | err = btrfs_run_delayed_refs(trans, root, updates); |
| 468 | if (err) /* Error code will also eval true */ |
| 469 | return err; |
| 470 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 471 | |
Josef Bacik | 9c8d86d | 2011-09-19 11:58:54 -0400 | [diff] [blame] | 472 | trans->block_rsv = rsv; |
| 473 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 474 | return should_end_transaction(trans, root); |
| 475 | } |
| 476 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 477 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 478 | struct btrfs_root *root, int throttle, int lock) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 479 | { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 480 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 481 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 482 | int count = 0; |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 483 | int err = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 484 | |
Josef Bacik | 2a1eb46 | 2011-04-13 15:15:59 -0400 | [diff] [blame] | 485 | if (--trans->use_count) { |
| 486 | trans->block_rsv = trans->orig_rsv; |
| 487 | return 0; |
| 488 | } |
| 489 | |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 490 | btrfs_trans_release_metadata(trans, root); |
Josef Bacik | 4c13d75 | 2011-08-30 11:31:29 -0400 | [diff] [blame] | 491 | trans->block_rsv = NULL; |
Chris Mason | 203bf28 | 2012-01-06 15:23:57 -0500 | [diff] [blame] | 492 | while (count < 2) { |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 493 | unsigned long cur = trans->delayed_ref_updates; |
| 494 | trans->delayed_ref_updates = 0; |
| 495 | if (cur && |
| 496 | trans->transaction->delayed_refs.num_heads_ready > 64) { |
| 497 | trans->delayed_ref_updates = 0; |
| 498 | btrfs_run_delayed_refs(trans, root, cur); |
| 499 | } else { |
| 500 | break; |
| 501 | } |
| 502 | count++; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 503 | } |
| 504 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 505 | if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && |
| 506 | should_end_transaction(trans, root)) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 507 | trans->transaction->blocked = 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 508 | smp_wmb(); |
| 509 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 510 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 511 | if (lock && cur_trans->blocked && !cur_trans->in_commit) { |
Josef Bacik | 81317fd | 2011-07-24 15:45:34 -0400 | [diff] [blame] | 512 | if (throttle) { |
| 513 | /* |
| 514 | * We may race with somebody else here so end up having |
| 515 | * to call end_transaction on ourselves again, so inc |
| 516 | * our use_count. |
| 517 | */ |
| 518 | trans->use_count++; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 519 | return btrfs_commit_transaction(trans, root); |
Josef Bacik | 81317fd | 2011-07-24 15:45:34 -0400 | [diff] [blame] | 520 | } else { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 521 | wake_up_process(info->transaction_kthread); |
Josef Bacik | 81317fd | 2011-07-24 15:45:34 -0400 | [diff] [blame] | 522 | } |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 523 | } |
| 524 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 525 | WARN_ON(cur_trans != info->running_transaction); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 526 | WARN_ON(atomic_read(&cur_trans->num_writers) < 1); |
| 527 | atomic_dec(&cur_trans->num_writers); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 528 | |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 529 | smp_mb(); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 530 | if (waitqueue_active(&cur_trans->writer_wait)) |
| 531 | wake_up(&cur_trans->writer_wait); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 532 | put_transaction(cur_trans); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 533 | |
| 534 | if (current->journal_info == trans) |
| 535 | current->journal_info = NULL; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 536 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 537 | if (throttle) |
| 538 | btrfs_run_delayed_iputs(root); |
| 539 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 540 | if (trans->aborted || |
| 541 | root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 542 | err = -EIO; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 543 | } |
| 544 | |
Dave Jones | 4edc2ca | 2012-04-12 16:03:56 -0400 | [diff] [blame] | 545 | memset(trans, 0, sizeof(*trans)); |
| 546 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
| 547 | return err; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 548 | } |
| 549 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 550 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 551 | struct btrfs_root *root) |
| 552 | { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 553 | int ret; |
| 554 | |
| 555 | ret = __btrfs_end_transaction(trans, root, 0, 1); |
| 556 | if (ret) |
| 557 | return ret; |
| 558 | return 0; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, |
| 562 | struct btrfs_root *root) |
| 563 | { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 564 | int ret; |
| 565 | |
| 566 | ret = __btrfs_end_transaction(trans, root, 1, 1); |
| 567 | if (ret) |
| 568 | return ret; |
| 569 | return 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, |
| 573 | struct btrfs_root *root) |
| 574 | { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 575 | int ret; |
| 576 | |
| 577 | ret = __btrfs_end_transaction(trans, root, 0, 0); |
| 578 | if (ret) |
| 579 | return ret; |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans, |
| 584 | struct btrfs_root *root) |
| 585 | { |
| 586 | return __btrfs_end_transaction(trans, root, 1, 1); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 587 | } |
| 588 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 589 | /* |
| 590 | * when btree blocks are allocated, they have some corresponding bits set for |
| 591 | * 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] | 592 | * those extents are sent to disk but does not wait on them |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 593 | */ |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 594 | int btrfs_write_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 595 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 596 | { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 597 | int err = 0; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 598 | int werr = 0; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 599 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 600 | u64 start = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 601 | u64 end; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 602 | |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 603 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
| 604 | mark)) { |
| 605 | convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, mark, |
| 606 | GFP_NOFS); |
| 607 | err = filemap_fdatawrite_range(mapping, start, end); |
| 608 | if (err) |
| 609 | werr = err; |
| 610 | cond_resched(); |
| 611 | start = end + 1; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 612 | } |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 613 | if (err) |
| 614 | werr = err; |
| 615 | return werr; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * when btree blocks are allocated, they have some corresponding bits set for |
| 620 | * them in one of two extent_io trees. This is used to make sure all of |
| 621 | * those extents are on disk for transaction or log commit. We wait |
| 622 | * on all the pages and clear them from the dirty pages state tree |
| 623 | */ |
| 624 | int btrfs_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 625 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 626 | { |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 627 | int err = 0; |
| 628 | int werr = 0; |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 629 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 630 | u64 start = 0; |
| 631 | u64 end; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 632 | |
Josef Bacik | 1728366 | 2011-09-26 13:58:47 -0400 | [diff] [blame] | 633 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
| 634 | EXTENT_NEED_WAIT)) { |
| 635 | clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS); |
| 636 | err = filemap_fdatawait_range(mapping, start, end); |
| 637 | if (err) |
| 638 | werr = err; |
| 639 | cond_resched(); |
| 640 | start = end + 1; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 641 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 642 | if (err) |
| 643 | werr = err; |
| 644 | return werr; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 645 | } |
| 646 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 647 | /* |
| 648 | * when btree blocks are allocated, they have some corresponding bits set for |
| 649 | * them in one of two extent_io trees. This is used to make sure all of |
| 650 | * those extents are on disk for transaction or log commit |
| 651 | */ |
| 652 | int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 653 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 654 | { |
| 655 | int ret; |
| 656 | int ret2; |
| 657 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 658 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
| 659 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
Chris Mason | bf0da8c | 2011-11-04 12:29:37 -0400 | [diff] [blame] | 660 | |
| 661 | if (ret) |
| 662 | return ret; |
| 663 | if (ret2) |
| 664 | return ret2; |
| 665 | return 0; |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 666 | } |
| 667 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 668 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
| 669 | struct btrfs_root *root) |
| 670 | { |
| 671 | if (!trans || !trans->transaction) { |
| 672 | struct inode *btree_inode; |
| 673 | btree_inode = root->fs_info->btree_inode; |
| 674 | return filemap_write_and_wait(btree_inode->i_mapping); |
| 675 | } |
| 676 | return btrfs_write_and_wait_marked_extents(root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 677 | &trans->transaction->dirty_pages, |
| 678 | EXTENT_DIRTY); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 679 | } |
| 680 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 681 | /* |
| 682 | * this is used to update the root pointer in the tree of tree roots. |
| 683 | * |
| 684 | * But, in the case of the extent allocation tree, updating the root |
| 685 | * pointer may allocate blocks which may change the root of the extent |
| 686 | * allocation tree. |
| 687 | * |
| 688 | * So, this loops and repeats and makes sure the cowonly root didn't |
| 689 | * change while the root pointer was being updated in the metadata. |
| 690 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 691 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
| 692 | struct btrfs_root *root) |
| 693 | { |
| 694 | int ret; |
| 695 | u64 old_root_bytenr; |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 696 | u64 old_root_used; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 697 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 698 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 699 | old_root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 700 | btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 701 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 702 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 703 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 704 | if (old_root_bytenr == root->node->start && |
| 705 | old_root_used == btrfs_root_used(&root->root_item)) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 706 | break; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 707 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 708 | btrfs_set_root_node(&root->root_item, root->node); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 709 | ret = btrfs_update_root(trans, tree_root, |
| 710 | &root->root_key, |
| 711 | &root->root_item); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 712 | if (ret) |
| 713 | return ret; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 714 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 715 | old_root_used = btrfs_root_used(&root->root_item); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 716 | ret = btrfs_write_dirty_block_groups(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 717 | if (ret) |
| 718 | return ret; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 719 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 720 | |
| 721 | if (root != root->fs_info->extent_root) |
| 722 | switch_commit_root(root); |
| 723 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 724 | return 0; |
| 725 | } |
| 726 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 727 | /* |
| 728 | * update all the cowonly tree roots on disk |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 729 | * |
| 730 | * The error handling in this function may not be obvious. Any of the |
| 731 | * failures will cause the file system to go offline. We still need |
| 732 | * to clean up the delayed refs. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 733 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 734 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
| 735 | struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 736 | { |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 737 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 738 | struct list_head *next; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 739 | struct extent_buffer *eb; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 740 | int ret; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 741 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 742 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 743 | if (ret) |
| 744 | return ret; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 745 | |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 746 | eb = btrfs_lock_root_node(fs_info->tree_root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 747 | ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, |
| 748 | 0, &eb); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 749 | btrfs_tree_unlock(eb); |
| 750 | free_extent_buffer(eb); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 751 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 752 | if (ret) |
| 753 | return ret; |
| 754 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 755 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 756 | if (ret) |
| 757 | return ret; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 758 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 759 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 760 | next = fs_info->dirty_cowonly_roots.next; |
| 761 | list_del_init(next); |
| 762 | root = list_entry(next, struct btrfs_root, dirty_list); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 763 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 764 | ret = update_cowonly_root(trans, root); |
| 765 | if (ret) |
| 766 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 767 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 768 | |
| 769 | down_write(&fs_info->extent_commit_sem); |
| 770 | switch_commit_root(fs_info->extent_root); |
| 771 | up_write(&fs_info->extent_commit_sem); |
| 772 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 773 | return 0; |
| 774 | } |
| 775 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 776 | /* |
| 777 | * dead roots are old snapshots that need to be deleted. This allocates |
| 778 | * a dirty root struct and adds it into the list of dead roots that need to |
| 779 | * be deleted |
| 780 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 781 | int btrfs_add_dead_root(struct btrfs_root *root) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 782 | { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 783 | spin_lock(&root->fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 784 | list_add(&root->root_list, &root->fs_info->dead_roots); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 785 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 786 | return 0; |
| 787 | } |
| 788 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 789 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 790 | * update all the cowonly tree roots on disk |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 791 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 792 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
| 793 | struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 794 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 795 | struct btrfs_root *gang[8]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 796 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 797 | int i; |
| 798 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 799 | int err = 0; |
| 800 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 801 | spin_lock(&fs_info->fs_roots_radix_lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 802 | while (1) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 803 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
| 804 | (void **)gang, 0, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 805 | ARRAY_SIZE(gang), |
| 806 | BTRFS_ROOT_TRANS_TAG); |
| 807 | if (ret == 0) |
| 808 | break; |
| 809 | for (i = 0; i < ret; i++) { |
| 810 | root = gang[i]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 811 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
| 812 | (unsigned long)root->root_key.objectid, |
| 813 | BTRFS_ROOT_TRANS_TAG); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 814 | spin_unlock(&fs_info->fs_roots_radix_lock); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 815 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 816 | btrfs_free_log(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 817 | btrfs_update_reloc_root(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 818 | btrfs_orphan_commit_root(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 819 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 820 | btrfs_save_ino_cache(root, trans); |
| 821 | |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 822 | /* see comments in should_cow_block() */ |
| 823 | root->force_cow = 0; |
| 824 | smp_wmb(); |
| 825 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 826 | if (root->commit_root != root->node) { |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 827 | mutex_lock(&root->fs_commit_mutex); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 828 | switch_commit_root(root); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 829 | btrfs_unpin_free_ino(root); |
| 830 | mutex_unlock(&root->fs_commit_mutex); |
| 831 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 832 | btrfs_set_root_node(&root->root_item, |
| 833 | root->node); |
| 834 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 835 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 836 | err = btrfs_update_root(trans, fs_info->tree_root, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 837 | &root->root_key, |
| 838 | &root->root_item); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 839 | spin_lock(&fs_info->fs_roots_radix_lock); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 840 | if (err) |
| 841 | break; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 842 | } |
| 843 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 844 | spin_unlock(&fs_info->fs_roots_radix_lock); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 845 | return err; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 846 | } |
| 847 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 848 | /* |
| 849 | * defrag a given btree. If cacheonly == 1, this won't read from the disk, |
| 850 | * otherwise every leaf in the btree is read and defragged. |
| 851 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 852 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
| 853 | { |
| 854 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 855 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 856 | int ret; |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 857 | unsigned long nr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 858 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 859 | if (xchg(&root->defrag_running, 1)) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 860 | return 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 861 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 862 | while (1) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 863 | trans = btrfs_start_transaction(root, 0); |
| 864 | if (IS_ERR(trans)) |
| 865 | return PTR_ERR(trans); |
| 866 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 867 | ret = btrfs_defrag_leaves(trans, root, cacheonly); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 868 | |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 869 | nr = trans->blocks_used; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 870 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 871 | btrfs_btree_balance_dirty(info->tree_root, nr); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 872 | cond_resched(); |
| 873 | |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 874 | if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 875 | break; |
| 876 | } |
| 877 | root->defrag_running = 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 878 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 879 | } |
| 880 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 881 | /* |
| 882 | * new snapshots need to be created at a very specific time in the |
| 883 | * transaction commit. This does the actual creation |
| 884 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 885 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 886 | struct btrfs_fs_info *fs_info, |
| 887 | struct btrfs_pending_snapshot *pending) |
| 888 | { |
| 889 | struct btrfs_key key; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 890 | struct btrfs_root_item *new_root_item; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 891 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 892 | struct btrfs_root *root = pending->root; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 893 | struct btrfs_root *parent_root; |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 894 | struct btrfs_block_rsv *rsv; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 895 | struct inode *parent_inode; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 896 | struct dentry *parent; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 897 | struct dentry *dentry; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 898 | struct extent_buffer *tmp; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 899 | struct extent_buffer *old; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 900 | int ret; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 901 | u64 to_reserve = 0; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 902 | u64 index = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 903 | u64 objectid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 904 | u64 root_flags; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 905 | |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 906 | rsv = trans->block_rsv; |
| 907 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 908 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
| 909 | if (!new_root_item) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 910 | ret = pending->error = -ENOMEM; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 911 | goto fail; |
| 912 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 913 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 914 | ret = btrfs_find_free_objectid(tree_root, &objectid); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 915 | if (ret) { |
| 916 | pending->error = ret; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 917 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 918 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 919 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 920 | btrfs_reloc_pre_snapshot(trans, pending, &to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 921 | |
| 922 | if (to_reserve > 0) { |
Miao Xie | 62f30c5 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 923 | ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv, |
| 924 | to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 925 | if (ret) { |
| 926 | pending->error = ret; |
| 927 | goto fail; |
| 928 | } |
| 929 | } |
| 930 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 931 | key.objectid = objectid; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 932 | key.offset = (u64)-1; |
| 933 | key.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 934 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 935 | trans->block_rsv = &pending->block_rsv; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 936 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 937 | dentry = pending->dentry; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 938 | parent = dget_parent(dentry); |
| 939 | parent_inode = parent->d_inode; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 940 | parent_root = BTRFS_I(parent_inode)->root; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 941 | record_root_in_trans(trans, parent_root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 942 | |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 943 | /* |
| 944 | * insert the directory item |
| 945 | */ |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 946 | ret = btrfs_set_inode_index(parent_inode, &index); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 947 | BUG_ON(ret); /* -ENOMEM */ |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 948 | ret = btrfs_insert_dir_item(trans, parent_root, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 949 | dentry->d_name.name, dentry->d_name.len, |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 950 | parent_inode, &key, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 951 | BTRFS_FT_DIR, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 952 | if (ret == -EEXIST) { |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 953 | pending->error = -EEXIST; |
| 954 | dput(parent); |
| 955 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 956 | } else if (ret) { |
| 957 | goto abort_trans_dput; |
| 958 | } |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 959 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 960 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
| 961 | dentry->d_name.len * 2); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 962 | ret = btrfs_update_inode(trans, parent_root, parent_inode); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 963 | if (ret) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 964 | goto abort_trans_dput; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 965 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 966 | /* |
| 967 | * pull in the delayed directory update |
| 968 | * and the delayed inode item |
| 969 | * otherwise we corrupt the FS during |
| 970 | * snapshot |
| 971 | */ |
| 972 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 973 | if (ret) { /* Transaction aborted */ |
| 974 | dput(parent); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 975 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 976 | } |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 977 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 978 | record_root_in_trans(trans, root); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 979 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
| 980 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 981 | btrfs_check_and_init_root_item(new_root_item); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 982 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 983 | root_flags = btrfs_root_flags(new_root_item); |
| 984 | if (pending->readonly) |
| 985 | root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; |
| 986 | else |
| 987 | root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; |
| 988 | btrfs_set_root_flags(new_root_item, root_flags); |
| 989 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 990 | old = btrfs_lock_root_node(root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 991 | ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 992 | if (ret) { |
| 993 | btrfs_tree_unlock(old); |
| 994 | free_extent_buffer(old); |
| 995 | goto abort_trans_dput; |
| 996 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 997 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 998 | btrfs_set_lock_blocking(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 999 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1000 | ret = btrfs_copy_root(trans, root, old, &tmp, objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1001 | /* clean up in any case */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1002 | btrfs_tree_unlock(old); |
| 1003 | free_extent_buffer(old); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1004 | if (ret) |
| 1005 | goto abort_trans_dput; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1006 | |
Liu Bo | f1ebcc7 | 2011-11-14 20:48:06 -0500 | [diff] [blame] | 1007 | /* see comments in should_cow_block() */ |
| 1008 | root->force_cow = 1; |
| 1009 | smp_wmb(); |
| 1010 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1011 | btrfs_set_root_node(new_root_item, tmp); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1012 | /* record when the snapshot was created in key.offset */ |
| 1013 | key.offset = trans->transid; |
| 1014 | ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1015 | btrfs_tree_unlock(tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1016 | free_extent_buffer(tmp); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1017 | if (ret) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1018 | goto abort_trans_dput; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 1019 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1020 | /* |
| 1021 | * insert root back/forward references |
| 1022 | */ |
| 1023 | ret = btrfs_add_root_ref(trans, tree_root, objectid, |
| 1024 | parent_root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1025 | btrfs_ino(parent_inode), index, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1026 | dentry->d_name.name, dentry->d_name.len); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1027 | dput(parent); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1028 | if (ret) |
| 1029 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1030 | |
| 1031 | key.offset = (u64)-1; |
| 1032 | pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1033 | if (IS_ERR(pending->snap)) { |
| 1034 | ret = PTR_ERR(pending->snap); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1035 | goto abort_trans; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1036 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1037 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1038 | ret = btrfs_reloc_post_snapshot(trans, pending); |
| 1039 | if (ret) |
| 1040 | goto abort_trans; |
| 1041 | ret = 0; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1042 | fail: |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1043 | kfree(new_root_item); |
Liu Bo | 98c9942 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1044 | trans->block_rsv = rsv; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1045 | btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1046 | return ret; |
| 1047 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1048 | abort_trans_dput: |
| 1049 | dput(parent); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1050 | abort_trans: |
| 1051 | btrfs_abort_transaction(trans, root, ret); |
| 1052 | goto fail; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1053 | } |
| 1054 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1055 | /* |
| 1056 | * create all the snapshots we've scheduled for creation |
| 1057 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1058 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
| 1059 | struct btrfs_fs_info *fs_info) |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1060 | { |
| 1061 | struct btrfs_pending_snapshot *pending; |
| 1062 | struct list_head *head = &trans->transaction->pending_snapshots; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1063 | |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 1064 | list_for_each_entry(pending, head, list) |
| 1065 | create_pending_snapshot(trans, fs_info, pending); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1066 | return 0; |
| 1067 | } |
| 1068 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1069 | static void update_super_roots(struct btrfs_root *root) |
| 1070 | { |
| 1071 | struct btrfs_root_item *root_item; |
| 1072 | struct btrfs_super_block *super; |
| 1073 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1074 | super = root->fs_info->super_copy; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1075 | |
| 1076 | root_item = &root->fs_info->chunk_root->root_item; |
| 1077 | super->chunk_root = root_item->bytenr; |
| 1078 | super->chunk_root_generation = root_item->generation; |
| 1079 | super->chunk_root_level = root_item->level; |
| 1080 | |
| 1081 | root_item = &root->fs_info->tree_root->root_item; |
| 1082 | super->root = root_item->bytenr; |
| 1083 | super->generation = root_item->generation; |
| 1084 | super->root_level = root_item->level; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 1085 | if (btrfs_test_opt(root, SPACE_CACHE)) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 1086 | super->cache_generation = root_item->generation; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1087 | } |
| 1088 | |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1089 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
| 1090 | { |
| 1091 | int ret = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1092 | spin_lock(&info->trans_lock); |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1093 | if (info->running_transaction) |
| 1094 | ret = info->running_transaction->in_commit; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1095 | spin_unlock(&info->trans_lock); |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1096 | return ret; |
| 1097 | } |
| 1098 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1099 | int btrfs_transaction_blocked(struct btrfs_fs_info *info) |
| 1100 | { |
| 1101 | int ret = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1102 | spin_lock(&info->trans_lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1103 | if (info->running_transaction) |
| 1104 | ret = info->running_transaction->blocked; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1105 | spin_unlock(&info->trans_lock); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1106 | return ret; |
| 1107 | } |
| 1108 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1109 | /* |
| 1110 | * wait for the current transaction commit to start and block subsequent |
| 1111 | * transaction joins |
| 1112 | */ |
| 1113 | static void wait_current_trans_commit_start(struct btrfs_root *root, |
| 1114 | struct btrfs_transaction *trans) |
| 1115 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 1116 | wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * wait for the current transaction to start and then become unblocked. |
| 1121 | * caller holds ref. |
| 1122 | */ |
| 1123 | static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, |
| 1124 | struct btrfs_transaction *trans) |
| 1125 | { |
Li Zefan | 72d63ed | 2011-07-14 03:17:00 +0000 | [diff] [blame] | 1126 | wait_event(root->fs_info->transaction_wait, |
| 1127 | trans->commit_done || (trans->in_commit && !trans->blocked)); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1128 | } |
| 1129 | |
| 1130 | /* |
| 1131 | * commit transactions asynchronously. once btrfs_commit_transaction_async |
| 1132 | * returns, any subsequent transaction will not be allowed to join. |
| 1133 | */ |
| 1134 | struct btrfs_async_commit { |
| 1135 | struct btrfs_trans_handle *newtrans; |
| 1136 | struct btrfs_root *root; |
| 1137 | struct delayed_work work; |
| 1138 | }; |
| 1139 | |
| 1140 | static void do_async_commit(struct work_struct *work) |
| 1141 | { |
| 1142 | struct btrfs_async_commit *ac = |
| 1143 | container_of(work, struct btrfs_async_commit, work.work); |
| 1144 | |
| 1145 | btrfs_commit_transaction(ac->newtrans, ac->root); |
| 1146 | kfree(ac); |
| 1147 | } |
| 1148 | |
| 1149 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
| 1150 | struct btrfs_root *root, |
| 1151 | int wait_for_unblock) |
| 1152 | { |
| 1153 | struct btrfs_async_commit *ac; |
| 1154 | struct btrfs_transaction *cur_trans; |
| 1155 | |
| 1156 | ac = kmalloc(sizeof(*ac), GFP_NOFS); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 1157 | if (!ac) |
| 1158 | return -ENOMEM; |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1159 | |
| 1160 | INIT_DELAYED_WORK(&ac->work, do_async_commit); |
| 1161 | ac->root = root; |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1162 | ac->newtrans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1163 | if (IS_ERR(ac->newtrans)) { |
| 1164 | int err = PTR_ERR(ac->newtrans); |
| 1165 | kfree(ac); |
| 1166 | return err; |
| 1167 | } |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1168 | |
| 1169 | /* take transaction reference */ |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1170 | cur_trans = trans->transaction; |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1171 | atomic_inc(&cur_trans->use_count); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1172 | |
| 1173 | btrfs_end_transaction(trans, root); |
| 1174 | schedule_delayed_work(&ac->work, 0); |
| 1175 | |
| 1176 | /* wait for transaction to start and unblock */ |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1177 | if (wait_for_unblock) |
| 1178 | wait_current_trans_commit_start_and_unblock(root, cur_trans); |
| 1179 | else |
| 1180 | wait_current_trans_commit_start(root, cur_trans); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1181 | |
Sage Weil | 38e8805 | 2011-06-10 18:43:13 +0000 | [diff] [blame] | 1182 | if (current->journal_info == trans) |
| 1183 | current->journal_info = NULL; |
| 1184 | |
| 1185 | put_transaction(cur_trans); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1186 | return 0; |
| 1187 | } |
| 1188 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1189 | |
| 1190 | static void cleanup_transaction(struct btrfs_trans_handle *trans, |
| 1191 | struct btrfs_root *root) |
| 1192 | { |
| 1193 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 1194 | |
| 1195 | WARN_ON(trans->use_count > 1); |
| 1196 | |
| 1197 | spin_lock(&root->fs_info->trans_lock); |
| 1198 | list_del_init(&cur_trans->list); |
| 1199 | spin_unlock(&root->fs_info->trans_lock); |
| 1200 | |
| 1201 | btrfs_cleanup_one_transaction(trans->transaction, root); |
| 1202 | |
| 1203 | put_transaction(cur_trans); |
| 1204 | put_transaction(cur_trans); |
| 1205 | |
| 1206 | trace_btrfs_transaction_commit(root); |
| 1207 | |
| 1208 | btrfs_scrub_continue(root); |
| 1209 | |
| 1210 | if (current->journal_info == trans) |
| 1211 | current->journal_info = NULL; |
| 1212 | |
| 1213 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
| 1214 | } |
| 1215 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1216 | /* |
| 1217 | * btrfs_transaction state sequence: |
| 1218 | * in_commit = 0, blocked = 0 (initial) |
| 1219 | * in_commit = 1, blocked = 1 |
| 1220 | * blocked = 0 |
| 1221 | * commit_done = 1 |
| 1222 | */ |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1223 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| 1224 | struct btrfs_root *root) |
| 1225 | { |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1226 | unsigned long joined = 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1227 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1228 | struct btrfs_transaction *prev_trans = NULL; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1229 | DEFINE_WAIT(wait); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1230 | int ret = -EIO; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1231 | int should_grow = 0; |
| 1232 | unsigned long now = get_seconds(); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 1233 | int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1234 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1235 | btrfs_run_ordered_operations(root, 0); |
| 1236 | |
Josef Bacik | b24e03d | 2011-10-14 14:40:17 -0400 | [diff] [blame] | 1237 | btrfs_trans_release_metadata(trans, root); |
Josef Bacik | 9c8d86d | 2011-09-19 11:58:54 -0400 | [diff] [blame] | 1238 | trans->block_rsv = NULL; |
| 1239 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1240 | if (cur_trans->aborted) |
| 1241 | goto cleanup_transaction; |
| 1242 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1243 | /* make a pass through all the delayed refs we have so far |
| 1244 | * any runnings procs may add more while we are here |
| 1245 | */ |
| 1246 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1247 | if (ret) |
| 1248 | goto cleanup_transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1249 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1250 | cur_trans = trans->transaction; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1251 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1252 | /* |
| 1253 | * set the flushing flag so procs in this transaction have to |
| 1254 | * start sending their work down. |
| 1255 | */ |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1256 | cur_trans->delayed_refs.flushing = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1257 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1258 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1259 | if (ret) |
| 1260 | goto cleanup_transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1261 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1262 | spin_lock(&cur_trans->commit_lock); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1263 | if (cur_trans->in_commit) { |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1264 | spin_unlock(&cur_trans->commit_lock); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1265 | atomic_inc(&cur_trans->use_count); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1266 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1267 | |
Li Zefan | b9c8300 | 2011-07-14 03:17:14 +0000 | [diff] [blame] | 1268 | wait_for_commit(root, cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1269 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1270 | put_transaction(cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1271 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1272 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1273 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1274 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1275 | trans->transaction->in_commit = 1; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1276 | trans->transaction->blocked = 1; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1277 | spin_unlock(&cur_trans->commit_lock); |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1278 | wake_up(&root->fs_info->transaction_blocked_wait); |
| 1279 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1280 | spin_lock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1281 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
| 1282 | prev_trans = list_entry(cur_trans->list.prev, |
| 1283 | struct btrfs_transaction, list); |
| 1284 | if (!prev_trans->commit_done) { |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1285 | atomic_inc(&prev_trans->use_count); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1286 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1287 | |
| 1288 | wait_for_commit(root, prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1289 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1290 | put_transaction(prev_trans); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1291 | } else { |
| 1292 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1293 | } |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1294 | } else { |
| 1295 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1296 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1297 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1298 | if (now < cur_trans->start_time || now - cur_trans->start_time < 1) |
| 1299 | should_grow = 1; |
| 1300 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1301 | do { |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1302 | int snap_pending = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1303 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1304 | joined = cur_trans->num_joined; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1305 | if (!list_empty(&trans->transaction->pending_snapshots)) |
| 1306 | snap_pending = 1; |
| 1307 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1308 | WARN_ON(cur_trans != trans->transaction); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1309 | |
Sage Weil | 0bdb1db | 2010-02-19 14:13:50 -0800 | [diff] [blame] | 1310 | if (flush_on_commit || snap_pending) { |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1311 | btrfs_start_delalloc_inodes(root, 1); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1312 | btrfs_wait_ordered_extents(root, 0, 1); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1313 | } |
| 1314 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1315 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1316 | if (ret) |
| 1317 | goto cleanup_transaction; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1318 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1319 | /* |
| 1320 | * rename don't use btrfs_join_transaction, so, once we |
| 1321 | * set the transaction to blocked above, we aren't going |
| 1322 | * to get any new ordered operations. We can safely run |
| 1323 | * it here and no for sure that nothing new will be added |
| 1324 | * to the list |
| 1325 | */ |
| 1326 | btrfs_run_ordered_operations(root, 1); |
| 1327 | |
Chris Mason | ed3b3d314 | 2010-05-25 10:12:41 -0400 | [diff] [blame] | 1328 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
| 1329 | TASK_UNINTERRUPTIBLE); |
| 1330 | |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1331 | if (atomic_read(&cur_trans->num_writers) > 1) |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1332 | schedule_timeout(MAX_SCHEDULE_TIMEOUT); |
| 1333 | else if (should_grow) |
| 1334 | schedule_timeout(1); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1335 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1336 | finish_wait(&cur_trans->writer_wait, &wait); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1337 | } while (atomic_read(&cur_trans->num_writers) > 1 || |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1338 | (should_grow && cur_trans->num_joined != joined)); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1339 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1340 | /* |
Josef Bacik | ed0ca14 | 2011-06-14 16:22:15 -0400 | [diff] [blame] | 1341 | * Ok now we need to make sure to block out any other joins while we |
| 1342 | * commit the transaction. We could have started a join before setting |
| 1343 | * no_join so make sure to wait for num_writers to == 1 again. |
| 1344 | */ |
| 1345 | spin_lock(&root->fs_info->trans_lock); |
| 1346 | root->fs_info->trans_no_join = 1; |
| 1347 | spin_unlock(&root->fs_info->trans_lock); |
| 1348 | wait_event(cur_trans->writer_wait, |
| 1349 | atomic_read(&cur_trans->num_writers) == 1); |
| 1350 | |
Chris Mason | e038dca | 2011-06-17 14:16:13 -0400 | [diff] [blame] | 1351 | /* |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1352 | * the reloc mutex makes sure that we stop |
| 1353 | * the balancing code from coming in and moving |
| 1354 | * extents around in the middle of the commit |
| 1355 | */ |
| 1356 | mutex_lock(&root->fs_info->reloc_mutex); |
| 1357 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1358 | ret = btrfs_run_delayed_items(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1359 | if (ret) { |
| 1360 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 1361 | goto cleanup_transaction; |
| 1362 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1363 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1364 | ret = create_pending_snapshots(trans, root->fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1365 | if (ret) { |
| 1366 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 1367 | goto cleanup_transaction; |
| 1368 | } |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1369 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1370 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1371 | if (ret) { |
| 1372 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 1373 | goto cleanup_transaction; |
| 1374 | } |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1375 | |
Chris Mason | e999376 | 2011-06-17 16:14:09 -0400 | [diff] [blame] | 1376 | /* |
| 1377 | * make sure none of the code above managed to slip in a |
| 1378 | * delayed item |
| 1379 | */ |
| 1380 | btrfs_assert_delayed_root_empty(root); |
| 1381 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1382 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1383 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1384 | btrfs_scrub_pause(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1385 | /* btrfs_commit_tree_roots is responsible for getting the |
| 1386 | * various roots consistent with each other. Every pointer |
| 1387 | * in the tree of tree roots has to point to the most up to date |
| 1388 | * root for every subvolume and other tree. So, we have to keep |
| 1389 | * the tree logging code from jumping in and changing any |
| 1390 | * of the trees. |
| 1391 | * |
| 1392 | * At this point in the commit, there can't be any tree-log |
| 1393 | * writers, but a little lower down we drop the trans mutex |
| 1394 | * and let new people in. By holding the tree_log_mutex |
| 1395 | * from now until after the super is written, we avoid races |
| 1396 | * with the tree-log code. |
| 1397 | */ |
| 1398 | mutex_lock(&root->fs_info->tree_log_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1399 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1400 | ret = commit_fs_roots(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1401 | if (ret) { |
| 1402 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1403 | goto cleanup_transaction; |
| 1404 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1405 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1406 | /* 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] | 1407 | * safe to free the root of tree log roots |
| 1408 | */ |
| 1409 | btrfs_free_log_root_tree(trans, root->fs_info); |
| 1410 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1411 | ret = commit_cowonly_roots(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1412 | if (ret) { |
| 1413 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1414 | goto cleanup_transaction; |
| 1415 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1416 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1417 | btrfs_prepare_extent_commit(trans, root); |
| 1418 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1419 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1420 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1421 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, |
| 1422 | root->fs_info->tree_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1423 | switch_commit_root(root->fs_info->tree_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1424 | |
| 1425 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, |
| 1426 | root->fs_info->chunk_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1427 | switch_commit_root(root->fs_info->chunk_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1428 | |
| 1429 | update_super_roots(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1430 | |
| 1431 | if (!root->fs_info->log_root_recovering) { |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1432 | btrfs_set_super_log_root(root->fs_info->super_copy, 0); |
| 1433 | btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1434 | } |
| 1435 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1436 | memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, |
| 1437 | sizeof(*root->fs_info->super_copy)); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1438 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1439 | trans->transaction->blocked = 0; |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1440 | spin_lock(&root->fs_info->trans_lock); |
| 1441 | root->fs_info->running_transaction = NULL; |
| 1442 | root->fs_info->trans_no_join = 0; |
| 1443 | spin_unlock(&root->fs_info->trans_lock); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1444 | mutex_unlock(&root->fs_info->reloc_mutex); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1445 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1446 | wake_up(&root->fs_info->transaction_wait); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1447 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1448 | ret = btrfs_write_and_wait_transaction(trans, root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1449 | if (ret) { |
| 1450 | btrfs_error(root->fs_info, ret, |
| 1451 | "Error while writing out transaction."); |
| 1452 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1453 | goto cleanup_transaction; |
| 1454 | } |
| 1455 | |
| 1456 | ret = write_ctree_super(trans, root, 0); |
| 1457 | if (ret) { |
| 1458 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1459 | goto cleanup_transaction; |
| 1460 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1461 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1462 | /* |
| 1463 | * the super is written, we can safely allow the tree-loggers |
| 1464 | * to go about their business |
| 1465 | */ |
| 1466 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1467 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1468 | btrfs_finish_extent_commit(trans, root); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1469 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1470 | cur_trans->commit_done = 1; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1471 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1472 | root->fs_info->last_trans_committed = cur_trans->transid; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1473 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1474 | wake_up(&cur_trans->commit_wait); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1475 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1476 | spin_lock(&root->fs_info->trans_lock); |
Josef Bacik | 13c5a93 | 2011-04-11 15:45:29 -0400 | [diff] [blame] | 1477 | list_del_init(&cur_trans->list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1478 | spin_unlock(&root->fs_info->trans_lock); |
| 1479 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1480 | put_transaction(cur_trans); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1481 | put_transaction(cur_trans); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1482 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 1483 | trace_btrfs_transaction_commit(root); |
| 1484 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1485 | btrfs_scrub_continue(root); |
| 1486 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1487 | if (current->journal_info == trans) |
| 1488 | current->journal_info = NULL; |
| 1489 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1490 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1491 | |
| 1492 | if (current != root->fs_info->transaction_kthread) |
| 1493 | btrfs_run_delayed_iputs(root); |
| 1494 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1495 | return ret; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1496 | |
| 1497 | cleanup_transaction: |
| 1498 | btrfs_printk(root->fs_info, "Skipping commit of aborted transaction.\n"); |
| 1499 | // WARN_ON(1); |
| 1500 | if (current->journal_info == trans) |
| 1501 | current->journal_info = NULL; |
| 1502 | cleanup_transaction(trans, root); |
| 1503 | |
| 1504 | return ret; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1505 | } |
| 1506 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1507 | /* |
| 1508 | * interface function to delete all the snapshots we have scheduled for deletion |
| 1509 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1510 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
| 1511 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1512 | LIST_HEAD(list); |
| 1513 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1514 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1515 | spin_lock(&fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1516 | list_splice_init(&fs_info->dead_roots, &list); |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1517 | spin_unlock(&fs_info->trans_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1518 | |
| 1519 | while (!list_empty(&list)) { |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 1520 | int ret; |
| 1521 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1522 | root = list_entry(list.next, struct btrfs_root, root_list); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1523 | list_del(&root->root_list); |
| 1524 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1525 | btrfs_kill_all_delayed_nodes(root); |
| 1526 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1527 | if (btrfs_header_backref_rev(root->node) < |
| 1528 | BTRFS_MIXED_BACKREF_REV) |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 1529 | ret = btrfs_drop_snapshot(root, NULL, 0, 0); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1530 | else |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 1531 | ret =btrfs_drop_snapshot(root, NULL, 1, 0); |
| 1532 | BUG_ON(ret < 0); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1533 | } |
| 1534 | return 0; |
| 1535 | } |