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 | d3c2fdc | 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" |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 30 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 31 | #define BTRFS_ROOT_TRANS_TAG 0 |
| 32 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 33 | static noinline void put_transaction(struct btrfs_transaction *transaction) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 34 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 35 | WARN_ON(transaction->use_count == 0); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 36 | transaction->use_count--; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 37 | if (transaction->use_count == 0) { |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 38 | list_del_init(&transaction->list); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 39 | memset(transaction, 0, sizeof(*transaction)); |
| 40 | kmem_cache_free(btrfs_transaction_cachep, transaction); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 41 | } |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 42 | } |
| 43 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 44 | static noinline void switch_commit_root(struct btrfs_root *root) |
| 45 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 46 | free_extent_buffer(root->commit_root); |
| 47 | root->commit_root = btrfs_root_node(root); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 48 | } |
| 49 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 50 | /* |
| 51 | * either allocate a new transaction or hop into the existing one |
| 52 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 53 | static noinline int join_transaction(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 54 | { |
| 55 | struct btrfs_transaction *cur_trans; |
| 56 | cur_trans = root->fs_info->running_transaction; |
| 57 | if (!cur_trans) { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 58 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
| 59 | GFP_NOFS); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 60 | BUG_ON(!cur_trans); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 61 | root->fs_info->generation++; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 62 | cur_trans->num_writers = 1; |
| 63 | cur_trans->num_joined = 0; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 64 | cur_trans->transid = root->fs_info->generation; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 65 | init_waitqueue_head(&cur_trans->writer_wait); |
| 66 | init_waitqueue_head(&cur_trans->commit_wait); |
| 67 | cur_trans->in_commit = 0; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 68 | cur_trans->blocked = 0; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 69 | cur_trans->use_count = 1; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 70 | cur_trans->commit_done = 0; |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 71 | cur_trans->start_time = get_seconds(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 72 | |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 73 | cur_trans->delayed_refs.root = RB_ROOT; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 74 | cur_trans->delayed_refs.num_entries = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 75 | cur_trans->delayed_refs.num_heads_ready = 0; |
| 76 | cur_trans->delayed_refs.num_heads = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 77 | cur_trans->delayed_refs.flushing = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 78 | cur_trans->delayed_refs.run_delayed_start = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 79 | spin_lock_init(&cur_trans->delayed_refs.lock); |
| 80 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 81 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 82 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 83 | extent_io_tree_init(&cur_trans->dirty_pages, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 84 | root->fs_info->btree_inode->i_mapping, |
| 85 | GFP_NOFS); |
Chris Mason | 48ec2cf | 2008-06-09 09:35:50 -0400 | [diff] [blame] | 86 | spin_lock(&root->fs_info->new_trans_lock); |
| 87 | root->fs_info->running_transaction = cur_trans; |
| 88 | spin_unlock(&root->fs_info->new_trans_lock); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 89 | } else { |
| 90 | cur_trans->num_writers++; |
| 91 | cur_trans->num_joined++; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 92 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 93 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 94 | return 0; |
| 95 | } |
| 96 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 97 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 98 | * this does all the record keeping required to make sure that a reference |
| 99 | * counted root is properly recorded in a given transaction. This is required |
| 100 | * to make sure the old root from before we joined the transaction is deleted |
| 101 | * when the transaction commits |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 102 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 103 | static noinline int record_root_in_trans(struct btrfs_trans_handle *trans, |
| 104 | struct btrfs_root *root) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 105 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 106 | if (root->ref_cows && root->last_trans < trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 107 | WARN_ON(root == root->fs_info->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 108 | WARN_ON(root->commit_root != root->node); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 109 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 110 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, |
| 111 | (unsigned long)root->root_key.objectid, |
| 112 | BTRFS_ROOT_TRANS_TAG); |
| 113 | root->last_trans = trans->transid; |
| 114 | btrfs_init_reloc_root(trans, root); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 115 | } |
| 116 | return 0; |
| 117 | } |
| 118 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 119 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
| 120 | struct btrfs_root *root) |
| 121 | { |
| 122 | if (!root->ref_cows) |
| 123 | return 0; |
| 124 | |
| 125 | mutex_lock(&root->fs_info->trans_mutex); |
| 126 | if (root->last_trans == trans->transid) { |
| 127 | mutex_unlock(&root->fs_info->trans_mutex); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | record_root_in_trans(trans, root); |
| 132 | mutex_unlock(&root->fs_info->trans_mutex); |
| 133 | return 0; |
| 134 | } |
| 135 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 136 | /* wait for commit against the current transaction to become unblocked |
| 137 | * when this is done, it is safe to start a new transaction, but the current |
| 138 | * transaction might not be fully on disk. |
| 139 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 140 | static void wait_current_trans(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 141 | { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 142 | struct btrfs_transaction *cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 143 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 144 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 145 | if (cur_trans && cur_trans->blocked) { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 146 | DEFINE_WAIT(wait); |
| 147 | cur_trans->use_count++; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 148 | while (1) { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 149 | prepare_to_wait(&root->fs_info->transaction_wait, &wait, |
| 150 | TASK_UNINTERRUPTIBLE); |
Zhao Lei | 471fa17 | 2010-03-25 12:35:14 +0000 | [diff] [blame] | 151 | if (!cur_trans->blocked) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 152 | break; |
Zhao Lei | 471fa17 | 2010-03-25 12:35:14 +0000 | [diff] [blame] | 153 | mutex_unlock(&root->fs_info->trans_mutex); |
| 154 | schedule(); |
| 155 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 156 | } |
Zhao Lei | 471fa17 | 2010-03-25 12:35:14 +0000 | [diff] [blame] | 157 | finish_wait(&root->fs_info->transaction_wait, &wait); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 158 | put_transaction(cur_trans); |
| 159 | } |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 160 | } |
| 161 | |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 162 | enum btrfs_trans_type { |
| 163 | TRANS_START, |
| 164 | TRANS_JOIN, |
| 165 | TRANS_USERSPACE, |
| 166 | }; |
| 167 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 168 | static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 169 | int num_blocks, int type) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 170 | { |
| 171 | struct btrfs_trans_handle *h = |
| 172 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); |
| 173 | int ret; |
| 174 | |
| 175 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 176 | if (!root->fs_info->log_root_recovering && |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 177 | ((type == TRANS_START && !root->fs_info->open_ioctl_trans) || |
| 178 | type == TRANS_USERSPACE)) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 179 | wait_current_trans(root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 180 | ret = join_transaction(root); |
| 181 | BUG_ON(ret); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 182 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 183 | h->transid = root->fs_info->running_transaction->transid; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 184 | h->transaction = root->fs_info->running_transaction; |
| 185 | h->blocks_reserved = num_blocks; |
| 186 | h->blocks_used = 0; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 187 | h->block_group = 0; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 188 | h->alloc_exclude_nr = 0; |
| 189 | h->alloc_exclude_start = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 190 | h->delayed_ref_updates = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 191 | |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 192 | if (!current->journal_info && type != TRANS_USERSPACE) |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 193 | current->journal_info = h; |
| 194 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 195 | root->fs_info->running_transaction->use_count++; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 196 | record_root_in_trans(h, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 197 | mutex_unlock(&root->fs_info->trans_mutex); |
| 198 | return h; |
| 199 | } |
| 200 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 201 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
| 202 | int num_blocks) |
| 203 | { |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 204 | return start_transaction(root, num_blocks, TRANS_START); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 205 | } |
| 206 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, |
| 207 | int num_blocks) |
| 208 | { |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 209 | return start_transaction(root, num_blocks, TRANS_JOIN); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 210 | } |
| 211 | |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 212 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r, |
| 213 | int num_blocks) |
| 214 | { |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 215 | return start_transaction(r, num_blocks, TRANS_USERSPACE); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 216 | } |
| 217 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 218 | /* wait for a transaction commit to be fully complete */ |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 219 | static noinline int wait_for_commit(struct btrfs_root *root, |
| 220 | struct btrfs_transaction *commit) |
| 221 | { |
| 222 | DEFINE_WAIT(wait); |
| 223 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 224 | while (!commit->commit_done) { |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 225 | prepare_to_wait(&commit->commit_wait, &wait, |
| 226 | TASK_UNINTERRUPTIBLE); |
| 227 | if (commit->commit_done) |
| 228 | break; |
| 229 | mutex_unlock(&root->fs_info->trans_mutex); |
| 230 | schedule(); |
| 231 | mutex_lock(&root->fs_info->trans_mutex); |
| 232 | } |
| 233 | mutex_unlock(&root->fs_info->trans_mutex); |
| 234 | finish_wait(&commit->commit_wait, &wait); |
| 235 | return 0; |
| 236 | } |
| 237 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 238 | #if 0 |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 239 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 240 | * rate limit against the drop_snapshot code. This helps to slow down new |
| 241 | * operations if the drop_snapshot code isn't able to keep up. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 242 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 243 | static void throttle_on_drops(struct btrfs_root *root) |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 244 | { |
| 245 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 246 | int harder_count = 0; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 247 | |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 248 | harder: |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 249 | if (atomic_read(&info->throttles)) { |
| 250 | DEFINE_WAIT(wait); |
| 251 | int thr; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 252 | thr = atomic_read(&info->throttle_gen); |
| 253 | |
| 254 | do { |
| 255 | prepare_to_wait(&info->transaction_throttle, |
| 256 | &wait, TASK_UNINTERRUPTIBLE); |
| 257 | if (!atomic_read(&info->throttles)) { |
| 258 | finish_wait(&info->transaction_throttle, &wait); |
| 259 | break; |
| 260 | } |
| 261 | schedule(); |
| 262 | finish_wait(&info->transaction_throttle, &wait); |
| 263 | } while (thr == atomic_read(&info->throttle_gen)); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 264 | harder_count++; |
| 265 | |
| 266 | if (root->fs_info->total_ref_cache_size > 1 * 1024 * 1024 && |
| 267 | harder_count < 2) |
| 268 | goto harder; |
| 269 | |
| 270 | if (root->fs_info->total_ref_cache_size > 5 * 1024 * 1024 && |
| 271 | harder_count < 10) |
| 272 | goto harder; |
| 273 | |
| 274 | if (root->fs_info->total_ref_cache_size > 10 * 1024 * 1024 && |
| 275 | harder_count < 20) |
| 276 | goto harder; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 277 | } |
| 278 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 279 | #endif |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 280 | |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 281 | void btrfs_throttle(struct btrfs_root *root) |
| 282 | { |
| 283 | mutex_lock(&root->fs_info->trans_mutex); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 284 | if (!root->fs_info->open_ioctl_trans) |
| 285 | wait_current_trans(root); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 286 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 287 | } |
| 288 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 289 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 290 | struct btrfs_root *root, int throttle) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 291 | { |
| 292 | struct btrfs_transaction *cur_trans; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 293 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 294 | int count = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 295 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 296 | while (count < 4) { |
| 297 | unsigned long cur = trans->delayed_ref_updates; |
| 298 | trans->delayed_ref_updates = 0; |
| 299 | if (cur && |
| 300 | trans->transaction->delayed_refs.num_heads_ready > 64) { |
| 301 | trans->delayed_ref_updates = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 302 | |
| 303 | /* |
| 304 | * do a full flush if the transaction is trying |
| 305 | * to close |
| 306 | */ |
| 307 | if (trans->transaction->delayed_refs.flushing) |
| 308 | cur = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 309 | btrfs_run_delayed_refs(trans, root, cur); |
| 310 | } else { |
| 311 | break; |
| 312 | } |
| 313 | count++; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 314 | } |
| 315 | |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 316 | mutex_lock(&info->trans_mutex); |
| 317 | cur_trans = info->running_transaction; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 318 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 319 | WARN_ON(cur_trans->num_writers < 1); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 320 | cur_trans->num_writers--; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 321 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 322 | if (waitqueue_active(&cur_trans->writer_wait)) |
| 323 | wake_up(&cur_trans->writer_wait); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 324 | put_transaction(cur_trans); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 325 | mutex_unlock(&info->trans_mutex); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 326 | |
| 327 | if (current->journal_info == trans) |
| 328 | current->journal_info = NULL; |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 329 | memset(trans, 0, sizeof(*trans)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 330 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 331 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 332 | if (throttle) |
| 333 | btrfs_run_delayed_iputs(root); |
| 334 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 335 | return 0; |
| 336 | } |
| 337 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 338 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 339 | struct btrfs_root *root) |
| 340 | { |
| 341 | return __btrfs_end_transaction(trans, root, 0); |
| 342 | } |
| 343 | |
| 344 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, |
| 345 | struct btrfs_root *root) |
| 346 | { |
| 347 | return __btrfs_end_transaction(trans, root, 1); |
| 348 | } |
| 349 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 350 | /* |
| 351 | * when btree blocks are allocated, they have some corresponding bits set for |
| 352 | * 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] | 353 | * those extents are sent to disk but does not wait on them |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 354 | */ |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 355 | int btrfs_write_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 356 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 357 | { |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 358 | int ret; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 359 | int err = 0; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 360 | int werr = 0; |
| 361 | struct page *page; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 362 | struct inode *btree_inode = root->fs_info->btree_inode; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 363 | u64 start = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 364 | u64 end; |
| 365 | unsigned long index; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 366 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 367 | while (1) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 368 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 369 | mark); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 370 | if (ret) |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 371 | break; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 372 | while (start <= end) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 373 | cond_resched(); |
| 374 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 375 | index = start >> PAGE_CACHE_SHIFT; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 376 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 377 | page = find_get_page(btree_inode->i_mapping, index); |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 378 | if (!page) |
| 379 | continue; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 380 | |
| 381 | btree_lock_page_hook(page); |
| 382 | if (!page->mapping) { |
| 383 | unlock_page(page); |
| 384 | page_cache_release(page); |
| 385 | continue; |
| 386 | } |
| 387 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 388 | if (PageWriteback(page)) { |
| 389 | if (PageDirty(page)) |
| 390 | wait_on_page_writeback(page); |
| 391 | else { |
| 392 | unlock_page(page); |
| 393 | page_cache_release(page); |
| 394 | continue; |
| 395 | } |
| 396 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 397 | err = write_one_page(page, 0); |
| 398 | if (err) |
| 399 | werr = err; |
| 400 | page_cache_release(page); |
| 401 | } |
| 402 | } |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 403 | if (err) |
| 404 | werr = err; |
| 405 | return werr; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * when btree blocks are allocated, they have some corresponding bits set for |
| 410 | * them in one of two extent_io trees. This is used to make sure all of |
| 411 | * those extents are on disk for transaction or log commit. We wait |
| 412 | * on all the pages and clear them from the dirty pages state tree |
| 413 | */ |
| 414 | int btrfs_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 415 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 416 | { |
| 417 | int ret; |
| 418 | int err = 0; |
| 419 | int werr = 0; |
| 420 | struct page *page; |
| 421 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 422 | u64 start = 0; |
| 423 | u64 end; |
| 424 | unsigned long index; |
| 425 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 426 | while (1) { |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 427 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, |
| 428 | mark); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 429 | if (ret) |
| 430 | break; |
| 431 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 432 | clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 433 | while (start <= end) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 434 | index = start >> PAGE_CACHE_SHIFT; |
| 435 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
| 436 | page = find_get_page(btree_inode->i_mapping, index); |
| 437 | if (!page) |
| 438 | continue; |
| 439 | if (PageDirty(page)) { |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 440 | btree_lock_page_hook(page); |
| 441 | wait_on_page_writeback(page); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 442 | err = write_one_page(page, 0); |
| 443 | if (err) |
| 444 | werr = err; |
| 445 | } |
Chris Mason | 105d931 | 2008-11-18 12:13:12 -0500 | [diff] [blame] | 446 | wait_on_page_writeback(page); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 447 | page_cache_release(page); |
| 448 | cond_resched(); |
| 449 | } |
| 450 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 451 | if (err) |
| 452 | werr = err; |
| 453 | return werr; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 454 | } |
| 455 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 456 | /* |
| 457 | * when btree blocks are allocated, they have some corresponding bits set for |
| 458 | * them in one of two extent_io trees. This is used to make sure all of |
| 459 | * those extents are on disk for transaction or log commit |
| 460 | */ |
| 461 | int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 462 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 463 | { |
| 464 | int ret; |
| 465 | int ret2; |
| 466 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 467 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
| 468 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 469 | return ret || ret2; |
| 470 | } |
| 471 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 472 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
| 473 | struct btrfs_root *root) |
| 474 | { |
| 475 | if (!trans || !trans->transaction) { |
| 476 | struct inode *btree_inode; |
| 477 | btree_inode = root->fs_info->btree_inode; |
| 478 | return filemap_write_and_wait(btree_inode->i_mapping); |
| 479 | } |
| 480 | return btrfs_write_and_wait_marked_extents(root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 481 | &trans->transaction->dirty_pages, |
| 482 | EXTENT_DIRTY); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 483 | } |
| 484 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 485 | /* |
| 486 | * this is used to update the root pointer in the tree of tree roots. |
| 487 | * |
| 488 | * But, in the case of the extent allocation tree, updating the root |
| 489 | * pointer may allocate blocks which may change the root of the extent |
| 490 | * allocation tree. |
| 491 | * |
| 492 | * So, this loops and repeats and makes sure the cowonly root didn't |
| 493 | * change while the root pointer was being updated in the metadata. |
| 494 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 495 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
| 496 | struct btrfs_root *root) |
| 497 | { |
| 498 | int ret; |
| 499 | u64 old_root_bytenr; |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 500 | u64 old_root_used; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 501 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 502 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 503 | old_root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 504 | btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 505 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 506 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 507 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 508 | if (old_root_bytenr == root->node->start && |
| 509 | old_root_used == btrfs_root_used(&root->root_item)) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 510 | break; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 511 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 512 | btrfs_set_root_node(&root->root_item, root->node); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 513 | ret = btrfs_update_root(trans, tree_root, |
| 514 | &root->root_key, |
| 515 | &root->root_item); |
| 516 | BUG_ON(ret); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 517 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 518 | old_root_used = btrfs_root_used(&root->root_item); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 519 | ret = btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 520 | BUG_ON(ret); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 521 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 522 | |
| 523 | if (root != root->fs_info->extent_root) |
| 524 | switch_commit_root(root); |
| 525 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 526 | return 0; |
| 527 | } |
| 528 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 529 | /* |
| 530 | * update all the cowonly tree roots on disk |
| 531 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 532 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
| 533 | struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 534 | { |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 535 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 536 | struct list_head *next; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 537 | struct extent_buffer *eb; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 538 | int ret; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 539 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 540 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 541 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 542 | |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 543 | eb = btrfs_lock_root_node(fs_info->tree_root); |
Chris Mason | 9fa8cfe | 2009-03-13 10:24:59 -0400 | [diff] [blame] | 544 | btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 545 | btrfs_tree_unlock(eb); |
| 546 | free_extent_buffer(eb); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 547 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 548 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 549 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 550 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 551 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 552 | next = fs_info->dirty_cowonly_roots.next; |
| 553 | list_del_init(next); |
| 554 | root = list_entry(next, struct btrfs_root, dirty_list); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 555 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 556 | update_cowonly_root(trans, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 557 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 558 | |
| 559 | down_write(&fs_info->extent_commit_sem); |
| 560 | switch_commit_root(fs_info->extent_root); |
| 561 | up_write(&fs_info->extent_commit_sem); |
| 562 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 563 | return 0; |
| 564 | } |
| 565 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 566 | /* |
| 567 | * dead roots are old snapshots that need to be deleted. This allocates |
| 568 | * a dirty root struct and adds it into the list of dead roots that need to |
| 569 | * be deleted |
| 570 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 571 | int btrfs_add_dead_root(struct btrfs_root *root) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 572 | { |
Yan Zheng | b48652c | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 573 | mutex_lock(&root->fs_info->trans_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 574 | list_add(&root->root_list, &root->fs_info->dead_roots); |
Yan Zheng | b48652c | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 575 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 576 | return 0; |
| 577 | } |
| 578 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 579 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 580 | * update all the cowonly tree roots on disk |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 581 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 582 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
| 583 | struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 584 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 585 | struct btrfs_root *gang[8]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 586 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 587 | int i; |
| 588 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 589 | int err = 0; |
| 590 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 591 | while (1) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 592 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
| 593 | (void **)gang, 0, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 594 | ARRAY_SIZE(gang), |
| 595 | BTRFS_ROOT_TRANS_TAG); |
| 596 | if (ret == 0) |
| 597 | break; |
| 598 | for (i = 0; i < ret; i++) { |
| 599 | root = gang[i]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 600 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
| 601 | (unsigned long)root->root_key.objectid, |
| 602 | BTRFS_ROOT_TRANS_TAG); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 603 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 604 | btrfs_free_log(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 605 | btrfs_update_reloc_root(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 606 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 607 | if (root->commit_root != root->node) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 608 | switch_commit_root(root); |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 609 | btrfs_set_root_node(&root->root_item, |
| 610 | root->node); |
| 611 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 612 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 613 | err = btrfs_update_root(trans, fs_info->tree_root, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 614 | &root->root_key, |
| 615 | &root->root_item); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 616 | if (err) |
| 617 | break; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 618 | } |
| 619 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 620 | return err; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 621 | } |
| 622 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 623 | /* |
| 624 | * defrag a given btree. If cacheonly == 1, this won't read from the disk, |
| 625 | * otherwise every leaf in the btree is read and defragged. |
| 626 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 627 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
| 628 | { |
| 629 | struct btrfs_fs_info *info = root->fs_info; |
| 630 | int ret; |
| 631 | struct btrfs_trans_handle *trans; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 632 | unsigned long nr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 633 | |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 634 | smp_mb(); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 635 | if (root->defrag_running) |
| 636 | return 0; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 637 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 638 | while (1) { |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 639 | root->defrag_running = 1; |
| 640 | ret = btrfs_defrag_leaves(trans, root, cacheonly); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 641 | nr = trans->blocks_used; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 642 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 643 | btrfs_btree_balance_dirty(info->tree_root, nr); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 644 | cond_resched(); |
| 645 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 646 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 3f157a2 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 647 | if (root->fs_info->closing || ret != -EAGAIN) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 648 | break; |
| 649 | } |
| 650 | root->defrag_running = 0; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 651 | smp_mb(); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 652 | btrfs_end_transaction(trans, root); |
| 653 | return 0; |
| 654 | } |
| 655 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 656 | #if 0 |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 657 | /* |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 658 | * when dropping snapshots, we generate a ton of delayed refs, and it makes |
| 659 | * sense not to join the transaction while it is trying to flush the current |
| 660 | * queue of delayed refs out. |
| 661 | * |
| 662 | * This is used by the drop snapshot code only |
| 663 | */ |
| 664 | static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info) |
| 665 | { |
| 666 | DEFINE_WAIT(wait); |
| 667 | |
| 668 | mutex_lock(&info->trans_mutex); |
| 669 | while (info->running_transaction && |
| 670 | info->running_transaction->delayed_refs.flushing) { |
| 671 | prepare_to_wait(&info->transaction_wait, &wait, |
| 672 | TASK_UNINTERRUPTIBLE); |
| 673 | mutex_unlock(&info->trans_mutex); |
Chris Mason | 59bc5c7 | 2009-04-24 14:39:25 -0400 | [diff] [blame] | 674 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 675 | schedule(); |
Chris Mason | 59bc5c7 | 2009-04-24 14:39:25 -0400 | [diff] [blame] | 676 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 677 | mutex_lock(&info->trans_mutex); |
| 678 | finish_wait(&info->transaction_wait, &wait); |
| 679 | } |
| 680 | mutex_unlock(&info->trans_mutex); |
| 681 | return 0; |
| 682 | } |
| 683 | |
| 684 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 685 | * Given a list of roots that need to be deleted, call btrfs_drop_snapshot on |
| 686 | * all of them |
| 687 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 688 | int btrfs_drop_dead_root(struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 689 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 690 | struct btrfs_trans_handle *trans; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 691 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 692 | unsigned long nr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 693 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 694 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 695 | while (1) { |
| 696 | /* |
| 697 | * we don't want to jump in and create a bunch of |
| 698 | * delayed refs if the transaction is starting to close |
| 699 | */ |
| 700 | wait_transaction_pre_flush(tree_root->fs_info); |
| 701 | trans = btrfs_start_transaction(tree_root, 1); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 702 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 703 | /* |
| 704 | * we've joined a transaction, make sure it isn't |
| 705 | * closing right now |
| 706 | */ |
| 707 | if (trans->transaction->delayed_refs.flushing) { |
| 708 | btrfs_end_transaction(trans, tree_root); |
| 709 | continue; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 710 | } |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 711 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 712 | ret = btrfs_drop_snapshot(trans, root); |
| 713 | if (ret != -EAGAIN) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 714 | break; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 715 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 716 | ret = btrfs_update_root(trans, tree_root, |
| 717 | &root->root_key, |
| 718 | &root->root_item); |
| 719 | if (ret) |
| 720 | break; |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 721 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 722 | nr = trans->blocks_used; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 723 | ret = btrfs_end_transaction(trans, tree_root); |
| 724 | BUG_ON(ret); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 725 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 726 | btrfs_btree_balance_dirty(tree_root, nr); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 727 | cond_resched(); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 728 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 729 | BUG_ON(ret); |
| 730 | |
| 731 | ret = btrfs_del_root(trans, tree_root, &root->root_key); |
| 732 | BUG_ON(ret); |
| 733 | |
| 734 | nr = trans->blocks_used; |
| 735 | ret = btrfs_end_transaction(trans, tree_root); |
| 736 | BUG_ON(ret); |
| 737 | |
| 738 | free_extent_buffer(root->node); |
| 739 | free_extent_buffer(root->commit_root); |
| 740 | kfree(root); |
| 741 | |
| 742 | btrfs_btree_balance_dirty(tree_root, nr); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 743 | return ret; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 744 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 745 | #endif |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 746 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 747 | /* |
| 748 | * new snapshots need to be created at a very specific time in the |
| 749 | * transaction commit. This does the actual creation |
| 750 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 751 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 752 | struct btrfs_fs_info *fs_info, |
| 753 | struct btrfs_pending_snapshot *pending) |
| 754 | { |
| 755 | struct btrfs_key key; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 756 | struct btrfs_root_item *new_root_item; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 757 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 758 | struct btrfs_root *root = pending->root; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 759 | struct btrfs_root *parent_root; |
| 760 | struct inode *parent_inode; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 761 | struct extent_buffer *tmp; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 762 | struct extent_buffer *old; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 763 | int ret; |
| 764 | u64 objectid; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 765 | int namelen; |
| 766 | u64 index = 0; |
| 767 | |
| 768 | parent_inode = pending->dentry->d_parent->d_inode; |
| 769 | parent_root = BTRFS_I(parent_inode)->root; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 770 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 771 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
| 772 | if (!new_root_item) { |
| 773 | ret = -ENOMEM; |
| 774 | goto fail; |
| 775 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 776 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
| 777 | if (ret) |
| 778 | goto fail; |
| 779 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 780 | key.objectid = objectid; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 781 | /* record when the snapshot was created in key.offset */ |
| 782 | key.offset = trans->transid; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 783 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 784 | |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 785 | memcpy(&pending->root_key, &key, sizeof(key)); |
| 786 | pending->root_key.offset = (u64)-1; |
| 787 | |
| 788 | record_root_in_trans(trans, parent_root); |
| 789 | /* |
| 790 | * insert the directory item |
| 791 | */ |
| 792 | namelen = strlen(pending->name); |
| 793 | ret = btrfs_set_inode_index(parent_inode, &index); |
| 794 | BUG_ON(ret); |
| 795 | ret = btrfs_insert_dir_item(trans, parent_root, |
| 796 | pending->name, namelen, |
| 797 | parent_inode->i_ino, |
| 798 | &pending->root_key, BTRFS_FT_DIR, index); |
| 799 | BUG_ON(ret); |
| 800 | |
| 801 | btrfs_i_size_write(parent_inode, parent_inode->i_size + namelen * 2); |
| 802 | ret = btrfs_update_inode(trans, parent_root, parent_inode); |
| 803 | BUG_ON(ret); |
| 804 | |
| 805 | record_root_in_trans(trans, root); |
| 806 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
| 807 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
| 808 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 809 | old = btrfs_lock_root_node(root); |
Chris Mason | 9fa8cfe | 2009-03-13 10:24:59 -0400 | [diff] [blame] | 810 | btrfs_cow_block(trans, root, old, NULL, 0, &old); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 811 | btrfs_set_lock_blocking(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 812 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 813 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
| 814 | btrfs_tree_unlock(old); |
| 815 | free_extent_buffer(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 816 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 817 | btrfs_set_root_node(new_root_item, tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 818 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 819 | new_root_item); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 820 | BUG_ON(ret); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 821 | btrfs_tree_unlock(tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 822 | free_extent_buffer(tmp); |
Yan Zheng | 52c2617 | 2009-01-05 15:43:43 -0500 | [diff] [blame] | 823 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 824 | ret = btrfs_add_root_ref(trans, parent_root->fs_info->tree_root, |
| 825 | pending->root_key.objectid, |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 826 | parent_root->root_key.objectid, |
| 827 | parent_inode->i_ino, index, pending->name, |
| 828 | namelen); |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 829 | BUG_ON(ret); |
| 830 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 831 | fail: |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 832 | kfree(new_root_item); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 833 | return ret; |
| 834 | } |
| 835 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 836 | /* |
| 837 | * create all the snapshots we've scheduled for creation |
| 838 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 839 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
| 840 | struct btrfs_fs_info *fs_info) |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 841 | { |
| 842 | struct btrfs_pending_snapshot *pending; |
| 843 | struct list_head *head = &trans->transaction->pending_snapshots; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 844 | int ret; |
| 845 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 846 | list_for_each_entry(pending, head, list) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 847 | ret = create_pending_snapshot(trans, fs_info, pending); |
| 848 | BUG_ON(ret); |
| 849 | } |
| 850 | return 0; |
| 851 | } |
| 852 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 853 | static void update_super_roots(struct btrfs_root *root) |
| 854 | { |
| 855 | struct btrfs_root_item *root_item; |
| 856 | struct btrfs_super_block *super; |
| 857 | |
| 858 | super = &root->fs_info->super_copy; |
| 859 | |
| 860 | root_item = &root->fs_info->chunk_root->root_item; |
| 861 | super->chunk_root = root_item->bytenr; |
| 862 | super->chunk_root_generation = root_item->generation; |
| 863 | super->chunk_root_level = root_item->level; |
| 864 | |
| 865 | root_item = &root->fs_info->tree_root->root_item; |
| 866 | super->root = root_item->bytenr; |
| 867 | super->generation = root_item->generation; |
| 868 | super->root_level = root_item->level; |
| 869 | } |
| 870 | |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 871 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
| 872 | { |
| 873 | int ret = 0; |
| 874 | spin_lock(&info->new_trans_lock); |
| 875 | if (info->running_transaction) |
| 876 | ret = info->running_transaction->in_commit; |
| 877 | spin_unlock(&info->new_trans_lock); |
| 878 | return ret; |
| 879 | } |
| 880 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 881 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| 882 | struct btrfs_root *root) |
| 883 | { |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 884 | unsigned long joined = 0; |
| 885 | unsigned long timeout = 1; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 886 | struct btrfs_transaction *cur_trans; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 887 | struct btrfs_transaction *prev_trans = NULL; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 888 | DEFINE_WAIT(wait); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 889 | int ret; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 890 | int should_grow = 0; |
| 891 | unsigned long now = get_seconds(); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 892 | int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 893 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 894 | btrfs_run_ordered_operations(root, 0); |
| 895 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 896 | /* make a pass through all the delayed refs we have so far |
| 897 | * any runnings procs may add more while we are here |
| 898 | */ |
| 899 | ret = btrfs_run_delayed_refs(trans, root, 0); |
| 900 | BUG_ON(ret); |
| 901 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 902 | cur_trans = trans->transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 903 | /* |
| 904 | * set the flushing flag so procs in this transaction have to |
| 905 | * start sending their work down. |
| 906 | */ |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 907 | cur_trans->delayed_refs.flushing = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 908 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 909 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 910 | BUG_ON(ret); |
| 911 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 912 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 913 | if (cur_trans->in_commit) { |
| 914 | cur_trans->use_count++; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 915 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 916 | btrfs_end_transaction(trans, root); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 917 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 918 | ret = wait_for_commit(root, cur_trans); |
| 919 | BUG_ON(ret); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 920 | |
| 921 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 922 | put_transaction(cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 923 | mutex_unlock(&root->fs_info->trans_mutex); |
| 924 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 925 | return 0; |
| 926 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 927 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 928 | trans->transaction->in_commit = 1; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 929 | trans->transaction->blocked = 1; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 930 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
| 931 | prev_trans = list_entry(cur_trans->list.prev, |
| 932 | struct btrfs_transaction, list); |
| 933 | if (!prev_trans->commit_done) { |
| 934 | prev_trans->use_count++; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 935 | mutex_unlock(&root->fs_info->trans_mutex); |
| 936 | |
| 937 | wait_for_commit(root, prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 938 | |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 939 | mutex_lock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 940 | put_transaction(prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 941 | } |
| 942 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 943 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 944 | if (now < cur_trans->start_time || now - cur_trans->start_time < 1) |
| 945 | should_grow = 1; |
| 946 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 947 | do { |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 948 | int snap_pending = 0; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 949 | joined = cur_trans->num_joined; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 950 | if (!list_empty(&trans->transaction->pending_snapshots)) |
| 951 | snap_pending = 1; |
| 952 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 953 | WARN_ON(cur_trans != trans->transaction); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 954 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 955 | TASK_UNINTERRUPTIBLE); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 956 | |
| 957 | if (cur_trans->num_writers > 1) |
| 958 | timeout = MAX_SCHEDULE_TIMEOUT; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 959 | else if (should_grow) |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 960 | timeout = 1; |
| 961 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 962 | mutex_unlock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 963 | |
Sage Weil | 0bdb1db | 2010-02-19 14:13:50 -0800 | [diff] [blame] | 964 | if (flush_on_commit || snap_pending) { |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 965 | btrfs_start_delalloc_inodes(root, 1); |
| 966 | ret = btrfs_wait_ordered_extents(root, 0, 1); |
Sage Weil | ebecd3d | 2009-07-24 13:17:44 -0400 | [diff] [blame] | 967 | BUG_ON(ret); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 968 | } |
| 969 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 970 | /* |
| 971 | * rename don't use btrfs_join_transaction, so, once we |
| 972 | * set the transaction to blocked above, we aren't going |
| 973 | * to get any new ordered operations. We can safely run |
| 974 | * it here and no for sure that nothing new will be added |
| 975 | * to the list |
| 976 | */ |
| 977 | btrfs_run_ordered_operations(root, 1); |
| 978 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 979 | smp_mb(); |
| 980 | if (cur_trans->num_writers > 1 || should_grow) |
| 981 | schedule_timeout(timeout); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 982 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 983 | mutex_lock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 984 | finish_wait(&cur_trans->writer_wait, &wait); |
| 985 | } while (cur_trans->num_writers > 1 || |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 986 | (should_grow && cur_trans->num_joined != joined)); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 987 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 988 | ret = create_pending_snapshots(trans, root->fs_info); |
| 989 | BUG_ON(ret); |
| 990 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 991 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 992 | BUG_ON(ret); |
| 993 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 994 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 995 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 996 | /* btrfs_commit_tree_roots is responsible for getting the |
| 997 | * various roots consistent with each other. Every pointer |
| 998 | * in the tree of tree roots has to point to the most up to date |
| 999 | * root for every subvolume and other tree. So, we have to keep |
| 1000 | * the tree logging code from jumping in and changing any |
| 1001 | * of the trees. |
| 1002 | * |
| 1003 | * At this point in the commit, there can't be any tree-log |
| 1004 | * writers, but a little lower down we drop the trans mutex |
| 1005 | * and let new people in. By holding the tree_log_mutex |
| 1006 | * from now until after the super is written, we avoid races |
| 1007 | * with the tree-log code. |
| 1008 | */ |
| 1009 | mutex_lock(&root->fs_info->tree_log_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1010 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1011 | ret = commit_fs_roots(trans, root); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1012 | BUG_ON(ret); |
| 1013 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1014 | /* 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] | 1015 | * safe to free the root of tree log roots |
| 1016 | */ |
| 1017 | btrfs_free_log_root_tree(trans, root->fs_info); |
| 1018 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1019 | ret = commit_cowonly_roots(trans, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1020 | BUG_ON(ret); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1021 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1022 | btrfs_prepare_extent_commit(trans, root); |
| 1023 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1024 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | cee36a0 | 2008-01-15 08:40:48 -0500 | [diff] [blame] | 1025 | spin_lock(&root->fs_info->new_trans_lock); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1026 | root->fs_info->running_transaction = NULL; |
Chris Mason | cee36a0 | 2008-01-15 08:40:48 -0500 | [diff] [blame] | 1027 | spin_unlock(&root->fs_info->new_trans_lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1028 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1029 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, |
| 1030 | root->fs_info->tree_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1031 | switch_commit_root(root->fs_info->tree_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1032 | |
| 1033 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, |
| 1034 | root->fs_info->chunk_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1035 | switch_commit_root(root->fs_info->chunk_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1036 | |
| 1037 | update_super_roots(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1038 | |
| 1039 | if (!root->fs_info->log_root_recovering) { |
| 1040 | btrfs_set_super_log_root(&root->fs_info->super_copy, 0); |
| 1041 | btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0); |
| 1042 | } |
| 1043 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1044 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
| 1045 | sizeof(root->fs_info->super_copy)); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1046 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1047 | trans->transaction->blocked = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1048 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1049 | wake_up(&root->fs_info->transaction_wait); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1050 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1051 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1052 | ret = btrfs_write_and_wait_transaction(trans, root); |
| 1053 | BUG_ON(ret); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 1054 | write_ctree_super(trans, root, 0); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1055 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1056 | /* |
| 1057 | * the super is written, we can safely allow the tree-loggers |
| 1058 | * to go about their business |
| 1059 | */ |
| 1060 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1061 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1062 | btrfs_finish_extent_commit(trans, root); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1063 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1064 | mutex_lock(&root->fs_info->trans_mutex); |
| 1065 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1066 | cur_trans->commit_done = 1; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1067 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1068 | root->fs_info->last_trans_committed = cur_trans->transid; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1069 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1070 | wake_up(&cur_trans->commit_wait); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1071 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1072 | put_transaction(cur_trans); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1073 | put_transaction(cur_trans); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1074 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1075 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1076 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1077 | if (current->journal_info == trans) |
| 1078 | current->journal_info = NULL; |
| 1079 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1080 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1081 | |
| 1082 | if (current != root->fs_info->transaction_kthread) |
| 1083 | btrfs_run_delayed_iputs(root); |
| 1084 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1085 | return ret; |
| 1086 | } |
| 1087 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1088 | /* |
| 1089 | * interface function to delete all the snapshots we have scheduled for deletion |
| 1090 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1091 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
| 1092 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1093 | LIST_HEAD(list); |
| 1094 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1095 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1096 | mutex_lock(&fs_info->trans_mutex); |
| 1097 | list_splice_init(&fs_info->dead_roots, &list); |
| 1098 | mutex_unlock(&fs_info->trans_mutex); |
| 1099 | |
| 1100 | while (!list_empty(&list)) { |
| 1101 | root = list_entry(list.next, struct btrfs_root, root_list); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1102 | list_del(&root->root_list); |
| 1103 | |
| 1104 | if (btrfs_header_backref_rev(root->node) < |
| 1105 | BTRFS_MIXED_BACKREF_REV) |
| 1106 | btrfs_drop_snapshot(root, 0); |
| 1107 | else |
| 1108 | btrfs_drop_snapshot(root, 1); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1109 | } |
| 1110 | return 0; |
| 1111 | } |