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> |
Chris Mason | 3408878 | 2007-06-12 11:36:58 -0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 21 | #include <linux/writeback.h> |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 22 | #include <linux/pagemap.h> |
Chris Mason | 5f2cc08 | 2008-11-07 18:22:45 -0500 | [diff] [blame] | 23 | #include <linux/blkdev.h> |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 24 | #include "ctree.h" |
| 25 | #include "disk-io.h" |
| 26 | #include "transaction.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 27 | #include "locking.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 28 | #include "tree-log.h" |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 29 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 30 | #define BTRFS_ROOT_TRANS_TAG 0 |
| 31 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 32 | static noinline void put_transaction(struct btrfs_transaction *transaction) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 33 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 34 | WARN_ON(transaction->use_count == 0); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 35 | transaction->use_count--; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 36 | if (transaction->use_count == 0) { |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 37 | list_del_init(&transaction->list); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 38 | memset(transaction, 0, sizeof(*transaction)); |
| 39 | kmem_cache_free(btrfs_transaction_cachep, transaction); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 40 | } |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 41 | } |
| 42 | |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 43 | static noinline void switch_commit_root(struct btrfs_root *root) |
| 44 | { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 45 | free_extent_buffer(root->commit_root); |
| 46 | root->commit_root = btrfs_root_node(root); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 47 | } |
| 48 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 49 | /* |
| 50 | * either allocate a new transaction or hop into the existing one |
| 51 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 52 | static noinline int join_transaction(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 53 | { |
| 54 | struct btrfs_transaction *cur_trans; |
| 55 | cur_trans = root->fs_info->running_transaction; |
| 56 | if (!cur_trans) { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 57 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
| 58 | GFP_NOFS); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 59 | BUG_ON(!cur_trans); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 60 | root->fs_info->generation++; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 61 | cur_trans->num_writers = 1; |
| 62 | cur_trans->num_joined = 0; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 63 | cur_trans->transid = root->fs_info->generation; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 64 | init_waitqueue_head(&cur_trans->writer_wait); |
| 65 | init_waitqueue_head(&cur_trans->commit_wait); |
| 66 | cur_trans->in_commit = 0; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 67 | cur_trans->blocked = 0; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 68 | cur_trans->use_count = 1; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 69 | cur_trans->commit_done = 0; |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 70 | cur_trans->start_time = get_seconds(); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 71 | |
| 72 | cur_trans->delayed_refs.root.rb_node = NULL; |
| 73 | cur_trans->delayed_refs.num_entries = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 74 | cur_trans->delayed_refs.num_heads_ready = 0; |
| 75 | cur_trans->delayed_refs.num_heads = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 76 | cur_trans->delayed_refs.flushing = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 77 | cur_trans->delayed_refs.run_delayed_start = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 78 | spin_lock_init(&cur_trans->delayed_refs.lock); |
| 79 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 80 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 81 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 82 | extent_io_tree_init(&cur_trans->dirty_pages, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 83 | root->fs_info->btree_inode->i_mapping, |
| 84 | GFP_NOFS); |
Chris Mason | 48ec2cf | 2008-06-09 09:35:50 -0400 | [diff] [blame] | 85 | spin_lock(&root->fs_info->new_trans_lock); |
| 86 | root->fs_info->running_transaction = cur_trans; |
| 87 | spin_unlock(&root->fs_info->new_trans_lock); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 88 | } else { |
| 89 | cur_trans->num_writers++; |
| 90 | cur_trans->num_joined++; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 91 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 92 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 93 | return 0; |
| 94 | } |
| 95 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 96 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 97 | * this does all the record keeping required to make sure that a reference |
| 98 | * counted root is properly recorded in a given transaction. This is required |
| 99 | * to make sure the old root from before we joined the transaction is deleted |
| 100 | * when the transaction commits |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 101 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 102 | static noinline int record_root_in_trans(struct btrfs_trans_handle *trans, |
| 103 | struct btrfs_root *root) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 104 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 105 | if (root->ref_cows && root->last_trans < trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 106 | WARN_ON(root == root->fs_info->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 107 | WARN_ON(root->commit_root != root->node); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 108 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 109 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, |
| 110 | (unsigned long)root->root_key.objectid, |
| 111 | BTRFS_ROOT_TRANS_TAG); |
| 112 | root->last_trans = trans->transid; |
| 113 | btrfs_init_reloc_root(trans, root); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 114 | } |
| 115 | return 0; |
| 116 | } |
| 117 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 118 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
| 119 | struct btrfs_root *root) |
| 120 | { |
| 121 | if (!root->ref_cows) |
| 122 | return 0; |
| 123 | |
| 124 | mutex_lock(&root->fs_info->trans_mutex); |
| 125 | if (root->last_trans == trans->transid) { |
| 126 | mutex_unlock(&root->fs_info->trans_mutex); |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | record_root_in_trans(trans, root); |
| 131 | mutex_unlock(&root->fs_info->trans_mutex); |
| 132 | return 0; |
| 133 | } |
| 134 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 135 | /* wait for commit against the current transaction to become unblocked |
| 136 | * when this is done, it is safe to start a new transaction, but the current |
| 137 | * transaction might not be fully on disk. |
| 138 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 139 | static void wait_current_trans(struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 140 | { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 141 | struct btrfs_transaction *cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 142 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 143 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 144 | if (cur_trans && cur_trans->blocked) { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 145 | DEFINE_WAIT(wait); |
| 146 | cur_trans->use_count++; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 147 | while (1) { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 148 | prepare_to_wait(&root->fs_info->transaction_wait, &wait, |
| 149 | TASK_UNINTERRUPTIBLE); |
| 150 | if (cur_trans->blocked) { |
| 151 | mutex_unlock(&root->fs_info->trans_mutex); |
| 152 | schedule(); |
| 153 | mutex_lock(&root->fs_info->trans_mutex); |
| 154 | finish_wait(&root->fs_info->transaction_wait, |
| 155 | &wait); |
| 156 | } else { |
| 157 | finish_wait(&root->fs_info->transaction_wait, |
| 158 | &wait); |
| 159 | break; |
| 160 | } |
| 161 | } |
| 162 | put_transaction(cur_trans); |
| 163 | } |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 164 | } |
| 165 | |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 166 | enum btrfs_trans_type { |
| 167 | TRANS_START, |
| 168 | TRANS_JOIN, |
| 169 | TRANS_USERSPACE, |
| 170 | }; |
| 171 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 172 | static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 173 | int num_blocks, int type) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 174 | { |
| 175 | struct btrfs_trans_handle *h = |
| 176 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); |
| 177 | int ret; |
| 178 | |
| 179 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 180 | if (!root->fs_info->log_root_recovering && |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 181 | ((type == TRANS_START && !root->fs_info->open_ioctl_trans) || |
| 182 | type == TRANS_USERSPACE)) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 183 | wait_current_trans(root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 184 | ret = join_transaction(root); |
| 185 | BUG_ON(ret); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 186 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 187 | h->transid = root->fs_info->running_transaction->transid; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 188 | h->transaction = root->fs_info->running_transaction; |
| 189 | h->blocks_reserved = num_blocks; |
| 190 | h->blocks_used = 0; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 191 | h->block_group = 0; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 192 | h->alloc_exclude_nr = 0; |
| 193 | h->alloc_exclude_start = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 194 | h->delayed_ref_updates = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 195 | |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 196 | if (!current->journal_info && type != TRANS_USERSPACE) |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 197 | current->journal_info = h; |
| 198 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 199 | root->fs_info->running_transaction->use_count++; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 200 | record_root_in_trans(h, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 201 | mutex_unlock(&root->fs_info->trans_mutex); |
| 202 | return h; |
| 203 | } |
| 204 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 205 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
| 206 | int num_blocks) |
| 207 | { |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 208 | return start_transaction(root, num_blocks, TRANS_START); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 209 | } |
| 210 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, |
| 211 | int num_blocks) |
| 212 | { |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 213 | return start_transaction(root, num_blocks, TRANS_JOIN); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 214 | } |
| 215 | |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 216 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r, |
| 217 | int num_blocks) |
| 218 | { |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 219 | return start_transaction(r, num_blocks, TRANS_USERSPACE); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 220 | } |
| 221 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 222 | /* wait for a transaction commit to be fully complete */ |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 223 | static noinline int wait_for_commit(struct btrfs_root *root, |
| 224 | struct btrfs_transaction *commit) |
| 225 | { |
| 226 | DEFINE_WAIT(wait); |
| 227 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 228 | while (!commit->commit_done) { |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 229 | prepare_to_wait(&commit->commit_wait, &wait, |
| 230 | TASK_UNINTERRUPTIBLE); |
| 231 | if (commit->commit_done) |
| 232 | break; |
| 233 | mutex_unlock(&root->fs_info->trans_mutex); |
| 234 | schedule(); |
| 235 | mutex_lock(&root->fs_info->trans_mutex); |
| 236 | } |
| 237 | mutex_unlock(&root->fs_info->trans_mutex); |
| 238 | finish_wait(&commit->commit_wait, &wait); |
| 239 | return 0; |
| 240 | } |
| 241 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 242 | #if 0 |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 243 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 244 | * rate limit against the drop_snapshot code. This helps to slow down new |
| 245 | * operations if the drop_snapshot code isn't able to keep up. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 246 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 247 | static void throttle_on_drops(struct btrfs_root *root) |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 248 | { |
| 249 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 250 | int harder_count = 0; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 251 | |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 252 | harder: |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 253 | if (atomic_read(&info->throttles)) { |
| 254 | DEFINE_WAIT(wait); |
| 255 | int thr; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 256 | thr = atomic_read(&info->throttle_gen); |
| 257 | |
| 258 | do { |
| 259 | prepare_to_wait(&info->transaction_throttle, |
| 260 | &wait, TASK_UNINTERRUPTIBLE); |
| 261 | if (!atomic_read(&info->throttles)) { |
| 262 | finish_wait(&info->transaction_throttle, &wait); |
| 263 | break; |
| 264 | } |
| 265 | schedule(); |
| 266 | finish_wait(&info->transaction_throttle, &wait); |
| 267 | } while (thr == atomic_read(&info->throttle_gen)); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 268 | harder_count++; |
| 269 | |
| 270 | if (root->fs_info->total_ref_cache_size > 1 * 1024 * 1024 && |
| 271 | harder_count < 2) |
| 272 | goto harder; |
| 273 | |
| 274 | if (root->fs_info->total_ref_cache_size > 5 * 1024 * 1024 && |
| 275 | harder_count < 10) |
| 276 | goto harder; |
| 277 | |
| 278 | if (root->fs_info->total_ref_cache_size > 10 * 1024 * 1024 && |
| 279 | harder_count < 20) |
| 280 | goto harder; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 281 | } |
| 282 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 283 | #endif |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 284 | |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 285 | void btrfs_throttle(struct btrfs_root *root) |
| 286 | { |
| 287 | mutex_lock(&root->fs_info->trans_mutex); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 288 | if (!root->fs_info->open_ioctl_trans) |
| 289 | wait_current_trans(root); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 290 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 291 | } |
| 292 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 293 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 294 | struct btrfs_root *root, int throttle) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 295 | { |
| 296 | struct btrfs_transaction *cur_trans; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 297 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 298 | int count = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 299 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 300 | while (count < 4) { |
| 301 | unsigned long cur = trans->delayed_ref_updates; |
| 302 | trans->delayed_ref_updates = 0; |
| 303 | if (cur && |
| 304 | trans->transaction->delayed_refs.num_heads_ready > 64) { |
| 305 | trans->delayed_ref_updates = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 306 | |
| 307 | /* |
| 308 | * do a full flush if the transaction is trying |
| 309 | * to close |
| 310 | */ |
| 311 | if (trans->transaction->delayed_refs.flushing) |
| 312 | cur = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 313 | btrfs_run_delayed_refs(trans, root, cur); |
| 314 | } else { |
| 315 | break; |
| 316 | } |
| 317 | count++; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 318 | } |
| 319 | |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 320 | mutex_lock(&info->trans_mutex); |
| 321 | cur_trans = info->running_transaction; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 322 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 323 | WARN_ON(cur_trans->num_writers < 1); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 324 | cur_trans->num_writers--; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 325 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 326 | if (waitqueue_active(&cur_trans->writer_wait)) |
| 327 | wake_up(&cur_trans->writer_wait); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 328 | put_transaction(cur_trans); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 329 | mutex_unlock(&info->trans_mutex); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 330 | |
| 331 | if (current->journal_info == trans) |
| 332 | current->journal_info = NULL; |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 333 | memset(trans, 0, sizeof(*trans)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 334 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 335 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 336 | return 0; |
| 337 | } |
| 338 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 339 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 340 | struct btrfs_root *root) |
| 341 | { |
| 342 | return __btrfs_end_transaction(trans, root, 0); |
| 343 | } |
| 344 | |
| 345 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, |
| 346 | struct btrfs_root *root) |
| 347 | { |
| 348 | return __btrfs_end_transaction(trans, root, 1); |
| 349 | } |
| 350 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 351 | /* |
| 352 | * when btree blocks are allocated, they have some corresponding bits set for |
| 353 | * 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] | 354 | * those extents are sent to disk but does not wait on them |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 355 | */ |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 356 | int btrfs_write_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 357 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 358 | { |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 359 | int ret; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 360 | int err = 0; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 361 | int werr = 0; |
| 362 | struct page *page; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 363 | struct inode *btree_inode = root->fs_info->btree_inode; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 364 | u64 start = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 365 | u64 end; |
| 366 | unsigned long index; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 367 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 368 | while (1) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 369 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 370 | mark); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 371 | if (ret) |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 372 | break; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 373 | while (start <= end) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 374 | cond_resched(); |
| 375 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 376 | index = start >> PAGE_CACHE_SHIFT; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 377 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 378 | page = find_get_page(btree_inode->i_mapping, index); |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 379 | if (!page) |
| 380 | continue; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 381 | |
| 382 | btree_lock_page_hook(page); |
| 383 | if (!page->mapping) { |
| 384 | unlock_page(page); |
| 385 | page_cache_release(page); |
| 386 | continue; |
| 387 | } |
| 388 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 389 | if (PageWriteback(page)) { |
| 390 | if (PageDirty(page)) |
| 391 | wait_on_page_writeback(page); |
| 392 | else { |
| 393 | unlock_page(page); |
| 394 | page_cache_release(page); |
| 395 | continue; |
| 396 | } |
| 397 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 398 | err = write_one_page(page, 0); |
| 399 | if (err) |
| 400 | werr = err; |
| 401 | page_cache_release(page); |
| 402 | } |
| 403 | } |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 404 | if (err) |
| 405 | werr = err; |
| 406 | return werr; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * when btree blocks are allocated, they have some corresponding bits set for |
| 411 | * them in one of two extent_io trees. This is used to make sure all of |
| 412 | * those extents are on disk for transaction or log commit. We wait |
| 413 | * on all the pages and clear them from the dirty pages state tree |
| 414 | */ |
| 415 | int btrfs_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 416 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 417 | { |
| 418 | int ret; |
| 419 | int err = 0; |
| 420 | int werr = 0; |
| 421 | struct page *page; |
| 422 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 423 | u64 start = 0; |
| 424 | u64 end; |
| 425 | unsigned long index; |
| 426 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 427 | while (1) { |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 428 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, |
| 429 | mark); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 430 | if (ret) |
| 431 | break; |
| 432 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 433 | clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 434 | while (start <= end) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 435 | index = start >> PAGE_CACHE_SHIFT; |
| 436 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
| 437 | page = find_get_page(btree_inode->i_mapping, index); |
| 438 | if (!page) |
| 439 | continue; |
| 440 | if (PageDirty(page)) { |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 441 | btree_lock_page_hook(page); |
| 442 | wait_on_page_writeback(page); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 443 | err = write_one_page(page, 0); |
| 444 | if (err) |
| 445 | werr = err; |
| 446 | } |
Chris Mason | 105d931 | 2008-11-18 12:13:12 -0500 | [diff] [blame] | 447 | wait_on_page_writeback(page); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 448 | page_cache_release(page); |
| 449 | cond_resched(); |
| 450 | } |
| 451 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 452 | if (err) |
| 453 | werr = err; |
| 454 | return werr; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 455 | } |
| 456 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 457 | /* |
| 458 | * when btree blocks are allocated, they have some corresponding bits set for |
| 459 | * them in one of two extent_io trees. This is used to make sure all of |
| 460 | * those extents are on disk for transaction or log commit |
| 461 | */ |
| 462 | int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 463 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 464 | { |
| 465 | int ret; |
| 466 | int ret2; |
| 467 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 468 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
| 469 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 470 | return ret || ret2; |
| 471 | } |
| 472 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 473 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
| 474 | struct btrfs_root *root) |
| 475 | { |
| 476 | if (!trans || !trans->transaction) { |
| 477 | struct inode *btree_inode; |
| 478 | btree_inode = root->fs_info->btree_inode; |
| 479 | return filemap_write_and_wait(btree_inode->i_mapping); |
| 480 | } |
| 481 | return btrfs_write_and_wait_marked_extents(root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 482 | &trans->transaction->dirty_pages, |
| 483 | EXTENT_DIRTY); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 484 | } |
| 485 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 486 | /* |
| 487 | * this is used to update the root pointer in the tree of tree roots. |
| 488 | * |
| 489 | * But, in the case of the extent allocation tree, updating the root |
| 490 | * pointer may allocate blocks which may change the root of the extent |
| 491 | * allocation tree. |
| 492 | * |
| 493 | * So, this loops and repeats and makes sure the cowonly root didn't |
| 494 | * change while the root pointer was being updated in the metadata. |
| 495 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 496 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
| 497 | struct btrfs_root *root) |
| 498 | { |
| 499 | int ret; |
| 500 | u64 old_root_bytenr; |
| 501 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 502 | |
| 503 | btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 504 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 505 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 506 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
| 507 | if (old_root_bytenr == root->node->start) |
| 508 | break; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 509 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 510 | btrfs_set_root_node(&root->root_item, root->node); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 511 | ret = btrfs_update_root(trans, tree_root, |
| 512 | &root->root_key, |
| 513 | &root->root_item); |
| 514 | BUG_ON(ret); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 515 | |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 516 | ret = btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 517 | BUG_ON(ret); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 518 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 519 | |
| 520 | if (root != root->fs_info->extent_root) |
| 521 | switch_commit_root(root); |
| 522 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 523 | return 0; |
| 524 | } |
| 525 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 526 | /* |
| 527 | * update all the cowonly tree roots on disk |
| 528 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 529 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
| 530 | struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 531 | { |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 532 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 533 | struct list_head *next; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 534 | struct extent_buffer *eb; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 535 | int ret; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 536 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 537 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 538 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 539 | |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 540 | eb = btrfs_lock_root_node(fs_info->tree_root); |
Chris Mason | 9fa8cfe | 2009-03-13 10:24:59 -0400 | [diff] [blame] | 541 | btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 542 | btrfs_tree_unlock(eb); |
| 543 | free_extent_buffer(eb); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 544 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 545 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 546 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 547 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 548 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 549 | next = fs_info->dirty_cowonly_roots.next; |
| 550 | list_del_init(next); |
| 551 | root = list_entry(next, struct btrfs_root, dirty_list); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 552 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 553 | update_cowonly_root(trans, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 554 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 555 | |
| 556 | down_write(&fs_info->extent_commit_sem); |
| 557 | switch_commit_root(fs_info->extent_root); |
| 558 | up_write(&fs_info->extent_commit_sem); |
| 559 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 560 | return 0; |
| 561 | } |
| 562 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 563 | /* |
| 564 | * dead roots are old snapshots that need to be deleted. This allocates |
| 565 | * a dirty root struct and adds it into the list of dead roots that need to |
| 566 | * be deleted |
| 567 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 568 | int btrfs_add_dead_root(struct btrfs_root *root) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 569 | { |
Yan Zheng | b48652c | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 570 | mutex_lock(&root->fs_info->trans_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 571 | list_add(&root->root_list, &root->fs_info->dead_roots); |
Yan Zheng | b48652c | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 572 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 573 | return 0; |
| 574 | } |
| 575 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 576 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 577 | * update all the cowonly tree roots on disk |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 578 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 579 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
| 580 | struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 581 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 582 | struct btrfs_root *gang[8]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 583 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 584 | int i; |
| 585 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 586 | int err = 0; |
| 587 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 588 | while (1) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 589 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
| 590 | (void **)gang, 0, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 591 | ARRAY_SIZE(gang), |
| 592 | BTRFS_ROOT_TRANS_TAG); |
| 593 | if (ret == 0) |
| 594 | break; |
| 595 | for (i = 0; i < ret; i++) { |
| 596 | root = gang[i]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 597 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
| 598 | (unsigned long)root->root_key.objectid, |
| 599 | BTRFS_ROOT_TRANS_TAG); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 600 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 601 | btrfs_free_log(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 602 | btrfs_update_reloc_root(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 603 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 604 | if (root->commit_root != root->node) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 605 | switch_commit_root(root); |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 606 | btrfs_set_root_node(&root->root_item, |
| 607 | root->node); |
| 608 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 609 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 610 | err = btrfs_update_root(trans, fs_info->tree_root, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 611 | &root->root_key, |
| 612 | &root->root_item); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 613 | if (err) |
| 614 | break; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 615 | } |
| 616 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 617 | return err; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 618 | } |
| 619 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 620 | /* |
| 621 | * defrag a given btree. If cacheonly == 1, this won't read from the disk, |
| 622 | * otherwise every leaf in the btree is read and defragged. |
| 623 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 624 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
| 625 | { |
| 626 | struct btrfs_fs_info *info = root->fs_info; |
| 627 | int ret; |
| 628 | struct btrfs_trans_handle *trans; |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 629 | unsigned long nr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 630 | |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 631 | smp_mb(); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 632 | if (root->defrag_running) |
| 633 | return 0; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 634 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 635 | while (1) { |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 636 | root->defrag_running = 1; |
| 637 | ret = btrfs_defrag_leaves(trans, root, cacheonly); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 638 | nr = trans->blocks_used; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 639 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 640 | btrfs_btree_balance_dirty(info->tree_root, nr); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 641 | cond_resched(); |
| 642 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 643 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 3f157a2 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 644 | if (root->fs_info->closing || ret != -EAGAIN) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 645 | break; |
| 646 | } |
| 647 | root->defrag_running = 0; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 648 | smp_mb(); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 649 | btrfs_end_transaction(trans, root); |
| 650 | return 0; |
| 651 | } |
| 652 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 653 | #if 0 |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 654 | /* |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 655 | * when dropping snapshots, we generate a ton of delayed refs, and it makes |
| 656 | * sense not to join the transaction while it is trying to flush the current |
| 657 | * queue of delayed refs out. |
| 658 | * |
| 659 | * This is used by the drop snapshot code only |
| 660 | */ |
| 661 | static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info) |
| 662 | { |
| 663 | DEFINE_WAIT(wait); |
| 664 | |
| 665 | mutex_lock(&info->trans_mutex); |
| 666 | while (info->running_transaction && |
| 667 | info->running_transaction->delayed_refs.flushing) { |
| 668 | prepare_to_wait(&info->transaction_wait, &wait, |
| 669 | TASK_UNINTERRUPTIBLE); |
| 670 | mutex_unlock(&info->trans_mutex); |
Chris Mason | 59bc5c7 | 2009-04-24 14:39:25 -0400 | [diff] [blame] | 671 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 672 | schedule(); |
Chris Mason | 59bc5c7 | 2009-04-24 14:39:25 -0400 | [diff] [blame] | 673 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 674 | mutex_lock(&info->trans_mutex); |
| 675 | finish_wait(&info->transaction_wait, &wait); |
| 676 | } |
| 677 | mutex_unlock(&info->trans_mutex); |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 682 | * Given a list of roots that need to be deleted, call btrfs_drop_snapshot on |
| 683 | * all of them |
| 684 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 685 | int btrfs_drop_dead_root(struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 686 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 687 | struct btrfs_trans_handle *trans; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 688 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 689 | unsigned long nr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 690 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 691 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 692 | while (1) { |
| 693 | /* |
| 694 | * we don't want to jump in and create a bunch of |
| 695 | * delayed refs if the transaction is starting to close |
| 696 | */ |
| 697 | wait_transaction_pre_flush(tree_root->fs_info); |
| 698 | trans = btrfs_start_transaction(tree_root, 1); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 699 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 700 | /* |
| 701 | * we've joined a transaction, make sure it isn't |
| 702 | * closing right now |
| 703 | */ |
| 704 | if (trans->transaction->delayed_refs.flushing) { |
| 705 | btrfs_end_transaction(trans, tree_root); |
| 706 | continue; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 707 | } |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 708 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 709 | ret = btrfs_drop_snapshot(trans, root); |
| 710 | if (ret != -EAGAIN) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 711 | break; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 712 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 713 | ret = btrfs_update_root(trans, tree_root, |
| 714 | &root->root_key, |
| 715 | &root->root_item); |
| 716 | if (ret) |
| 717 | break; |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 718 | |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 719 | nr = trans->blocks_used; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 720 | ret = btrfs_end_transaction(trans, tree_root); |
| 721 | BUG_ON(ret); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 722 | |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 723 | btrfs_btree_balance_dirty(tree_root, nr); |
Chris Mason | 4dc11904 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 724 | cond_resched(); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 725 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 726 | BUG_ON(ret); |
| 727 | |
| 728 | ret = btrfs_del_root(trans, tree_root, &root->root_key); |
| 729 | BUG_ON(ret); |
| 730 | |
| 731 | nr = trans->blocks_used; |
| 732 | ret = btrfs_end_transaction(trans, tree_root); |
| 733 | BUG_ON(ret); |
| 734 | |
| 735 | free_extent_buffer(root->node); |
| 736 | free_extent_buffer(root->commit_root); |
| 737 | kfree(root); |
| 738 | |
| 739 | btrfs_btree_balance_dirty(tree_root, nr); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 740 | return ret; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 741 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 742 | #endif |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 743 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 744 | /* |
| 745 | * new snapshots need to be created at a very specific time in the |
| 746 | * transaction commit. This does the actual creation |
| 747 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 748 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 749 | struct btrfs_fs_info *fs_info, |
| 750 | struct btrfs_pending_snapshot *pending) |
| 751 | { |
| 752 | struct btrfs_key key; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 753 | struct btrfs_root_item *new_root_item; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 754 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 755 | struct btrfs_root *root = pending->root; |
| 756 | struct extent_buffer *tmp; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 757 | struct extent_buffer *old; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 758 | int ret; |
| 759 | u64 objectid; |
| 760 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 761 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
| 762 | if (!new_root_item) { |
| 763 | ret = -ENOMEM; |
| 764 | goto fail; |
| 765 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 766 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
| 767 | if (ret) |
| 768 | goto fail; |
| 769 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 770 | record_root_in_trans(trans, root); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 771 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 772 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 773 | |
| 774 | key.objectid = objectid; |
Yan, Zheng | 1c4850e | 2009-09-21 15:55:59 -0400 | [diff] [blame] | 775 | /* record when the snapshot was created in key.offset */ |
| 776 | key.offset = trans->transid; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 777 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 778 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 779 | old = btrfs_lock_root_node(root); |
Chris Mason | 9fa8cfe | 2009-03-13 10:24:59 -0400 | [diff] [blame] | 780 | btrfs_cow_block(trans, root, old, NULL, 0, &old); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 781 | btrfs_set_lock_blocking(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 782 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 783 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
| 784 | btrfs_tree_unlock(old); |
| 785 | free_extent_buffer(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 786 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 787 | btrfs_set_root_node(new_root_item, tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 788 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 789 | new_root_item); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 790 | btrfs_tree_unlock(tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 791 | free_extent_buffer(tmp); |
| 792 | if (ret) |
| 793 | goto fail; |
| 794 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 795 | key.offset = (u64)-1; |
| 796 | memcpy(&pending->root_key, &key, sizeof(key)); |
| 797 | fail: |
| 798 | kfree(new_root_item); |
| 799 | return ret; |
| 800 | } |
| 801 | |
| 802 | static noinline int finish_pending_snapshot(struct btrfs_fs_info *fs_info, |
| 803 | struct btrfs_pending_snapshot *pending) |
| 804 | { |
| 805 | int ret; |
| 806 | int namelen; |
| 807 | u64 index = 0; |
| 808 | struct btrfs_trans_handle *trans; |
| 809 | struct inode *parent_inode; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 810 | struct btrfs_root *parent_root; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 811 | |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 812 | parent_inode = pending->dentry->d_parent->d_inode; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 813 | parent_root = BTRFS_I(parent_inode)->root; |
Yan Zheng | 180591b | 2009-01-06 09:58:06 -0500 | [diff] [blame] | 814 | trans = btrfs_join_transaction(parent_root, 1); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 815 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 816 | /* |
| 817 | * insert the directory item |
| 818 | */ |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 819 | namelen = strlen(pending->name); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 820 | ret = btrfs_set_inode_index(parent_inode, &index); |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 821 | ret = btrfs_insert_dir_item(trans, parent_root, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 822 | pending->name, namelen, |
| 823 | parent_inode->i_ino, |
| 824 | &pending->root_key, BTRFS_FT_DIR, index); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 825 | |
| 826 | if (ret) |
| 827 | goto fail; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 828 | |
Yan Zheng | 52c2617 | 2009-01-05 15:43:43 -0500 | [diff] [blame] | 829 | btrfs_i_size_write(parent_inode, parent_inode->i_size + namelen * 2); |
| 830 | ret = btrfs_update_inode(trans, parent_root, parent_inode); |
| 831 | BUG_ON(ret); |
| 832 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 833 | ret = btrfs_add_root_ref(trans, parent_root->fs_info->tree_root, |
| 834 | pending->root_key.objectid, |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 835 | parent_root->root_key.objectid, |
| 836 | parent_inode->i_ino, index, pending->name, |
| 837 | namelen); |
| 838 | |
| 839 | BUG_ON(ret); |
| 840 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 841 | fail: |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 842 | btrfs_end_transaction(trans, fs_info->fs_root); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 843 | return ret; |
| 844 | } |
| 845 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 846 | /* |
| 847 | * create all the snapshots we've scheduled for creation |
| 848 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 849 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
| 850 | struct btrfs_fs_info *fs_info) |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 851 | { |
| 852 | struct btrfs_pending_snapshot *pending; |
| 853 | struct list_head *head = &trans->transaction->pending_snapshots; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 854 | int ret; |
| 855 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 856 | list_for_each_entry(pending, head, list) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 857 | ret = create_pending_snapshot(trans, fs_info, pending); |
| 858 | BUG_ON(ret); |
| 859 | } |
| 860 | return 0; |
| 861 | } |
| 862 | |
| 863 | static noinline int finish_pending_snapshots(struct btrfs_trans_handle *trans, |
| 864 | struct btrfs_fs_info *fs_info) |
| 865 | { |
| 866 | struct btrfs_pending_snapshot *pending; |
| 867 | struct list_head *head = &trans->transaction->pending_snapshots; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 868 | int ret; |
| 869 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 870 | while (!list_empty(head)) { |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 871 | pending = list_entry(head->next, |
| 872 | struct btrfs_pending_snapshot, list); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 873 | ret = finish_pending_snapshot(fs_info, pending); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 874 | BUG_ON(ret); |
| 875 | list_del(&pending->list); |
| 876 | kfree(pending->name); |
| 877 | kfree(pending); |
| 878 | } |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 879 | return 0; |
| 880 | } |
| 881 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 882 | static void update_super_roots(struct btrfs_root *root) |
| 883 | { |
| 884 | struct btrfs_root_item *root_item; |
| 885 | struct btrfs_super_block *super; |
| 886 | |
| 887 | super = &root->fs_info->super_copy; |
| 888 | |
| 889 | root_item = &root->fs_info->chunk_root->root_item; |
| 890 | super->chunk_root = root_item->bytenr; |
| 891 | super->chunk_root_generation = root_item->generation; |
| 892 | super->chunk_root_level = root_item->level; |
| 893 | |
| 894 | root_item = &root->fs_info->tree_root->root_item; |
| 895 | super->root = root_item->bytenr; |
| 896 | super->generation = root_item->generation; |
| 897 | super->root_level = root_item->level; |
| 898 | } |
| 899 | |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 900 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
| 901 | { |
| 902 | int ret = 0; |
| 903 | spin_lock(&info->new_trans_lock); |
| 904 | if (info->running_transaction) |
| 905 | ret = info->running_transaction->in_commit; |
| 906 | spin_unlock(&info->new_trans_lock); |
| 907 | return ret; |
| 908 | } |
| 909 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 910 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| 911 | struct btrfs_root *root) |
| 912 | { |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 913 | unsigned long joined = 0; |
| 914 | unsigned long timeout = 1; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 915 | struct btrfs_transaction *cur_trans; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 916 | struct btrfs_transaction *prev_trans = NULL; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 917 | DEFINE_WAIT(wait); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 918 | int ret; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 919 | int should_grow = 0; |
| 920 | unsigned long now = get_seconds(); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 921 | int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 922 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 923 | btrfs_run_ordered_operations(root, 0); |
| 924 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 925 | /* make a pass through all the delayed refs we have so far |
| 926 | * any runnings procs may add more while we are here |
| 927 | */ |
| 928 | ret = btrfs_run_delayed_refs(trans, root, 0); |
| 929 | BUG_ON(ret); |
| 930 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 931 | cur_trans = trans->transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 932 | /* |
| 933 | * set the flushing flag so procs in this transaction have to |
| 934 | * start sending their work down. |
| 935 | */ |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 936 | cur_trans->delayed_refs.flushing = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 937 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 938 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 939 | BUG_ON(ret); |
| 940 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 941 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 942 | if (cur_trans->in_commit) { |
| 943 | cur_trans->use_count++; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 944 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 945 | btrfs_end_transaction(trans, root); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 946 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 947 | ret = wait_for_commit(root, cur_trans); |
| 948 | BUG_ON(ret); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 949 | |
| 950 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 951 | put_transaction(cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 952 | mutex_unlock(&root->fs_info->trans_mutex); |
| 953 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 954 | return 0; |
| 955 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 956 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 957 | trans->transaction->in_commit = 1; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 958 | trans->transaction->blocked = 1; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 959 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
| 960 | prev_trans = list_entry(cur_trans->list.prev, |
| 961 | struct btrfs_transaction, list); |
| 962 | if (!prev_trans->commit_done) { |
| 963 | prev_trans->use_count++; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 964 | mutex_unlock(&root->fs_info->trans_mutex); |
| 965 | |
| 966 | wait_for_commit(root, prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 967 | |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 968 | mutex_lock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 969 | put_transaction(prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 970 | } |
| 971 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 972 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 973 | if (now < cur_trans->start_time || now - cur_trans->start_time < 1) |
| 974 | should_grow = 1; |
| 975 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 976 | do { |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 977 | int snap_pending = 0; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 978 | joined = cur_trans->num_joined; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 979 | if (!list_empty(&trans->transaction->pending_snapshots)) |
| 980 | snap_pending = 1; |
| 981 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 982 | WARN_ON(cur_trans != trans->transaction); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 983 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 984 | TASK_UNINTERRUPTIBLE); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 985 | |
| 986 | if (cur_trans->num_writers > 1) |
| 987 | timeout = MAX_SCHEDULE_TIMEOUT; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 988 | else if (should_grow) |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 989 | timeout = 1; |
| 990 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 991 | mutex_unlock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 992 | |
Sage Weil | ebecd3d | 2009-07-24 13:17:44 -0400 | [diff] [blame] | 993 | if (flush_on_commit) { |
| 994 | btrfs_start_delalloc_inodes(root); |
| 995 | ret = btrfs_wait_ordered_extents(root, 0); |
| 996 | BUG_ON(ret); |
| 997 | } else if (snap_pending) { |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 998 | ret = btrfs_wait_ordered_extents(root, 1); |
| 999 | BUG_ON(ret); |
| 1000 | } |
| 1001 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1002 | /* |
| 1003 | * rename don't use btrfs_join_transaction, so, once we |
| 1004 | * set the transaction to blocked above, we aren't going |
| 1005 | * to get any new ordered operations. We can safely run |
| 1006 | * it here and no for sure that nothing new will be added |
| 1007 | * to the list |
| 1008 | */ |
| 1009 | btrfs_run_ordered_operations(root, 1); |
| 1010 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1011 | smp_mb(); |
| 1012 | if (cur_trans->num_writers > 1 || should_grow) |
| 1013 | schedule_timeout(timeout); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1014 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1015 | mutex_lock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1016 | finish_wait(&cur_trans->writer_wait, &wait); |
| 1017 | } while (cur_trans->num_writers > 1 || |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1018 | (should_grow && cur_trans->num_joined != joined)); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1019 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1020 | ret = create_pending_snapshots(trans, root->fs_info); |
| 1021 | BUG_ON(ret); |
| 1022 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1023 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 1024 | BUG_ON(ret); |
| 1025 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1026 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1027 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1028 | /* btrfs_commit_tree_roots is responsible for getting the |
| 1029 | * various roots consistent with each other. Every pointer |
| 1030 | * in the tree of tree roots has to point to the most up to date |
| 1031 | * root for every subvolume and other tree. So, we have to keep |
| 1032 | * the tree logging code from jumping in and changing any |
| 1033 | * of the trees. |
| 1034 | * |
| 1035 | * At this point in the commit, there can't be any tree-log |
| 1036 | * writers, but a little lower down we drop the trans mutex |
| 1037 | * and let new people in. By holding the tree_log_mutex |
| 1038 | * from now until after the super is written, we avoid races |
| 1039 | * with the tree-log code. |
| 1040 | */ |
| 1041 | mutex_lock(&root->fs_info->tree_log_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1042 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1043 | ret = commit_fs_roots(trans, root); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1044 | BUG_ON(ret); |
| 1045 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1046 | /* 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] | 1047 | * safe to free the root of tree log roots |
| 1048 | */ |
| 1049 | btrfs_free_log_root_tree(trans, root->fs_info); |
| 1050 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1051 | ret = commit_cowonly_roots(trans, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1052 | BUG_ON(ret); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1053 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1054 | btrfs_prepare_extent_commit(trans, root); |
| 1055 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1056 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | cee36a0 | 2008-01-15 08:40:48 -0500 | [diff] [blame] | 1057 | spin_lock(&root->fs_info->new_trans_lock); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1058 | root->fs_info->running_transaction = NULL; |
Chris Mason | cee36a0 | 2008-01-15 08:40:48 -0500 | [diff] [blame] | 1059 | spin_unlock(&root->fs_info->new_trans_lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1060 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1061 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, |
| 1062 | root->fs_info->tree_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1063 | switch_commit_root(root->fs_info->tree_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1064 | |
| 1065 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, |
| 1066 | root->fs_info->chunk_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1067 | switch_commit_root(root->fs_info->chunk_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1068 | |
| 1069 | update_super_roots(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1070 | |
| 1071 | if (!root->fs_info->log_root_recovering) { |
| 1072 | btrfs_set_super_log_root(&root->fs_info->super_copy, 0); |
| 1073 | btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0); |
| 1074 | } |
| 1075 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1076 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
| 1077 | sizeof(root->fs_info->super_copy)); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1078 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1079 | trans->transaction->blocked = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1080 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1081 | wake_up(&root->fs_info->transaction_wait); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1082 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1083 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1084 | ret = btrfs_write_and_wait_transaction(trans, root); |
| 1085 | BUG_ON(ret); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 1086 | write_ctree_super(trans, root, 0); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1087 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1088 | /* |
| 1089 | * the super is written, we can safely allow the tree-loggers |
| 1090 | * to go about their business |
| 1091 | */ |
| 1092 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1093 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1094 | btrfs_finish_extent_commit(trans, root); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1095 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1096 | /* do the directory inserts of any pending snapshot creations */ |
| 1097 | finish_pending_snapshots(trans, root->fs_info); |
| 1098 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1099 | mutex_lock(&root->fs_info->trans_mutex); |
| 1100 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1101 | cur_trans->commit_done = 1; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1102 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1103 | root->fs_info->last_trans_committed = cur_trans->transid; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1104 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1105 | wake_up(&cur_trans->commit_wait); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1106 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1107 | put_transaction(cur_trans); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1108 | put_transaction(cur_trans); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1109 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1110 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1111 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1112 | if (current->journal_info == trans) |
| 1113 | current->journal_info = NULL; |
| 1114 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1115 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1116 | return ret; |
| 1117 | } |
| 1118 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1119 | /* |
| 1120 | * interface function to delete all the snapshots we have scheduled for deletion |
| 1121 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1122 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
| 1123 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1124 | LIST_HEAD(list); |
| 1125 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1126 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1127 | mutex_lock(&fs_info->trans_mutex); |
| 1128 | list_splice_init(&fs_info->dead_roots, &list); |
| 1129 | mutex_unlock(&fs_info->trans_mutex); |
| 1130 | |
| 1131 | while (!list_empty(&list)) { |
| 1132 | root = list_entry(list.next, struct btrfs_root, root_list); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1133 | list_del(&root->root_list); |
| 1134 | |
| 1135 | if (btrfs_header_backref_rev(root->node) < |
| 1136 | BTRFS_MIXED_BACKREF_REV) |
| 1137 | btrfs_drop_snapshot(root, 0); |
| 1138 | else |
| 1139 | btrfs_drop_snapshot(root, 1); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1140 | } |
| 1141 | return 0; |
| 1142 | } |