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, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 166 | TRANS_JOIN_NOLOCK, |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 167 | }; |
| 168 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 169 | static int may_wait_transaction(struct btrfs_root *root, int type) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 170 | { |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 171 | if (!root->fs_info->log_root_recovering && |
Josef Bacik | 249ac1e | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 172 | ((type == TRANS_START && !root->fs_info->open_ioctl_trans) || |
| 173 | type == TRANS_USERSPACE)) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 174 | return 1; |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, |
| 179 | u64 num_items, int type) |
| 180 | { |
| 181 | struct btrfs_trans_handle *h; |
| 182 | struct btrfs_transaction *cur_trans; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 183 | int ret; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 184 | |
| 185 | if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) |
| 186 | return ERR_PTR(-EROFS); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 187 | again: |
| 188 | h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); |
| 189 | if (!h) |
| 190 | return ERR_PTR(-ENOMEM); |
| 191 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 192 | if (type != TRANS_JOIN_NOLOCK) |
| 193 | mutex_lock(&root->fs_info->trans_mutex); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 194 | if (may_wait_transaction(root, type)) |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 195 | wait_current_trans(root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 196 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 197 | ret = join_transaction(root); |
| 198 | BUG_ON(ret); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 199 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 200 | cur_trans = root->fs_info->running_transaction; |
| 201 | cur_trans->use_count++; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 202 | if (type != TRANS_JOIN_NOLOCK) |
| 203 | mutex_unlock(&root->fs_info->trans_mutex); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 204 | |
| 205 | h->transid = cur_trans->transid; |
| 206 | h->transaction = cur_trans; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 207 | h->blocks_used = 0; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 208 | h->block_group = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 209 | h->bytes_reserved = 0; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 210 | h->delayed_ref_updates = 0; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 211 | h->block_rsv = NULL; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 212 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 213 | smp_mb(); |
| 214 | if (cur_trans->blocked && may_wait_transaction(root, type)) { |
| 215 | btrfs_commit_transaction(h, root); |
| 216 | goto again; |
| 217 | } |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 218 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 219 | if (num_items > 0) { |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 220 | ret = btrfs_trans_reserve_metadata(h, root, num_items); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 221 | if (ret == -EAGAIN) { |
| 222 | btrfs_commit_transaction(h, root); |
| 223 | goto again; |
| 224 | } |
| 225 | if (ret < 0) { |
| 226 | btrfs_end_transaction(h, root); |
| 227 | return ERR_PTR(ret); |
| 228 | } |
| 229 | } |
| 230 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 231 | if (type != TRANS_JOIN_NOLOCK) |
| 232 | mutex_lock(&root->fs_info->trans_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 233 | record_root_in_trans(h, root); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 234 | if (type != TRANS_JOIN_NOLOCK) |
| 235 | mutex_unlock(&root->fs_info->trans_mutex); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 236 | |
| 237 | if (!current->journal_info && type != TRANS_USERSPACE) |
| 238 | current->journal_info = h; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 239 | return h; |
| 240 | } |
| 241 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 242 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 243 | int num_items) |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 244 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 245 | return start_transaction(root, num_items, TRANS_START); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 246 | } |
| 247 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, |
| 248 | int num_blocks) |
| 249 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 250 | return start_transaction(root, 0, TRANS_JOIN); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 251 | } |
| 252 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 253 | struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root, |
| 254 | int num_blocks) |
| 255 | { |
| 256 | return start_transaction(root, 0, TRANS_JOIN_NOLOCK); |
| 257 | } |
| 258 | |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 259 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r, |
| 260 | int num_blocks) |
| 261 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 262 | return start_transaction(r, 0, TRANS_USERSPACE); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 263 | } |
| 264 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 265 | /* wait for a transaction commit to be fully complete */ |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 266 | static noinline int wait_for_commit(struct btrfs_root *root, |
| 267 | struct btrfs_transaction *commit) |
| 268 | { |
| 269 | DEFINE_WAIT(wait); |
| 270 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 271 | while (!commit->commit_done) { |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 272 | prepare_to_wait(&commit->commit_wait, &wait, |
| 273 | TASK_UNINTERRUPTIBLE); |
| 274 | if (commit->commit_done) |
| 275 | break; |
| 276 | mutex_unlock(&root->fs_info->trans_mutex); |
| 277 | schedule(); |
| 278 | mutex_lock(&root->fs_info->trans_mutex); |
| 279 | } |
| 280 | mutex_unlock(&root->fs_info->trans_mutex); |
| 281 | finish_wait(&commit->commit_wait, &wait); |
| 282 | return 0; |
| 283 | } |
| 284 | |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 285 | int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) |
| 286 | { |
| 287 | struct btrfs_transaction *cur_trans = NULL, *t; |
| 288 | int ret; |
| 289 | |
| 290 | mutex_lock(&root->fs_info->trans_mutex); |
| 291 | |
| 292 | ret = 0; |
| 293 | if (transid) { |
| 294 | if (transid <= root->fs_info->last_trans_committed) |
| 295 | goto out_unlock; |
| 296 | |
| 297 | /* find specified transaction */ |
| 298 | list_for_each_entry(t, &root->fs_info->trans_list, list) { |
| 299 | if (t->transid == transid) { |
| 300 | cur_trans = t; |
| 301 | break; |
| 302 | } |
| 303 | if (t->transid > transid) |
| 304 | break; |
| 305 | } |
| 306 | ret = -EINVAL; |
| 307 | if (!cur_trans) |
| 308 | goto out_unlock; /* bad transid */ |
| 309 | } else { |
| 310 | /* find newest transaction that is committing | committed */ |
| 311 | list_for_each_entry_reverse(t, &root->fs_info->trans_list, |
| 312 | list) { |
| 313 | if (t->in_commit) { |
| 314 | if (t->commit_done) |
| 315 | goto out_unlock; |
| 316 | cur_trans = t; |
| 317 | break; |
| 318 | } |
| 319 | } |
| 320 | if (!cur_trans) |
| 321 | goto out_unlock; /* nothing committing|committed */ |
| 322 | } |
| 323 | |
| 324 | cur_trans->use_count++; |
| 325 | mutex_unlock(&root->fs_info->trans_mutex); |
| 326 | |
| 327 | wait_for_commit(root, cur_trans); |
| 328 | |
| 329 | mutex_lock(&root->fs_info->trans_mutex); |
| 330 | put_transaction(cur_trans); |
| 331 | ret = 0; |
| 332 | out_unlock: |
| 333 | mutex_unlock(&root->fs_info->trans_mutex); |
| 334 | return ret; |
| 335 | } |
| 336 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 337 | #if 0 |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 338 | /* |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 339 | * rate limit against the drop_snapshot code. This helps to slow down new |
| 340 | * operations if the drop_snapshot code isn't able to keep up. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 341 | */ |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 342 | static void throttle_on_drops(struct btrfs_root *root) |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 343 | { |
| 344 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 345 | int harder_count = 0; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 346 | |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 347 | harder: |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 348 | if (atomic_read(&info->throttles)) { |
| 349 | DEFINE_WAIT(wait); |
| 350 | int thr; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 351 | thr = atomic_read(&info->throttle_gen); |
| 352 | |
| 353 | do { |
| 354 | prepare_to_wait(&info->transaction_throttle, |
| 355 | &wait, TASK_UNINTERRUPTIBLE); |
| 356 | if (!atomic_read(&info->throttles)) { |
| 357 | finish_wait(&info->transaction_throttle, &wait); |
| 358 | break; |
| 359 | } |
| 360 | schedule(); |
| 361 | finish_wait(&info->transaction_throttle, &wait); |
| 362 | } while (thr == atomic_read(&info->throttle_gen)); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 363 | harder_count++; |
| 364 | |
| 365 | if (root->fs_info->total_ref_cache_size > 1 * 1024 * 1024 && |
| 366 | harder_count < 2) |
| 367 | goto harder; |
| 368 | |
| 369 | if (root->fs_info->total_ref_cache_size > 5 * 1024 * 1024 && |
| 370 | harder_count < 10) |
| 371 | goto harder; |
| 372 | |
| 373 | if (root->fs_info->total_ref_cache_size > 10 * 1024 * 1024 && |
| 374 | harder_count < 20) |
| 375 | goto harder; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 376 | } |
| 377 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 378 | #endif |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 379 | |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 380 | void btrfs_throttle(struct btrfs_root *root) |
| 381 | { |
| 382 | mutex_lock(&root->fs_info->trans_mutex); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 383 | if (!root->fs_info->open_ioctl_trans) |
| 384 | wait_current_trans(root); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 385 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 37d1aee | 2008-07-31 10:48:37 -0400 | [diff] [blame] | 386 | } |
| 387 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 388 | static int should_end_transaction(struct btrfs_trans_handle *trans, |
| 389 | struct btrfs_root *root) |
| 390 | { |
| 391 | int ret; |
| 392 | ret = btrfs_block_rsv_check(trans, root, |
| 393 | &root->fs_info->global_block_rsv, 0, 5); |
| 394 | return ret ? 1 : 0; |
| 395 | } |
| 396 | |
| 397 | int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, |
| 398 | struct btrfs_root *root) |
| 399 | { |
| 400 | struct btrfs_transaction *cur_trans = trans->transaction; |
| 401 | int updates; |
| 402 | |
| 403 | if (cur_trans->blocked || cur_trans->delayed_refs.flushing) |
| 404 | return 1; |
| 405 | |
| 406 | updates = trans->delayed_ref_updates; |
| 407 | trans->delayed_ref_updates = 0; |
| 408 | if (updates) |
| 409 | btrfs_run_delayed_refs(trans, root, updates); |
| 410 | |
| 411 | return should_end_transaction(trans, root); |
| 412 | } |
| 413 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 414 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 415 | struct btrfs_root *root, int throttle, int lock) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 416 | { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 417 | struct btrfs_transaction *cur_trans = trans->transaction; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 418 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 419 | int count = 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 420 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 421 | while (count < 4) { |
| 422 | unsigned long cur = trans->delayed_ref_updates; |
| 423 | trans->delayed_ref_updates = 0; |
| 424 | if (cur && |
| 425 | trans->transaction->delayed_refs.num_heads_ready > 64) { |
| 426 | trans->delayed_ref_updates = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 427 | |
| 428 | /* |
| 429 | * do a full flush if the transaction is trying |
| 430 | * to close |
| 431 | */ |
| 432 | if (trans->transaction->delayed_refs.flushing) |
| 433 | cur = 0; |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 434 | btrfs_run_delayed_refs(trans, root, cur); |
| 435 | } else { |
| 436 | break; |
| 437 | } |
| 438 | count++; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 439 | } |
| 440 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 441 | btrfs_trans_release_metadata(trans, root); |
| 442 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 443 | if (lock && !root->fs_info->open_ioctl_trans && |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 444 | should_end_transaction(trans, root)) |
| 445 | trans->transaction->blocked = 1; |
| 446 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 447 | if (lock && cur_trans->blocked && !cur_trans->in_commit) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 448 | if (throttle) |
| 449 | return btrfs_commit_transaction(trans, root); |
| 450 | else |
| 451 | wake_up_process(info->transaction_kthread); |
| 452 | } |
| 453 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 454 | if (lock) |
| 455 | mutex_lock(&info->trans_mutex); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 456 | WARN_ON(cur_trans != info->running_transaction); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 457 | WARN_ON(cur_trans->num_writers < 1); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 458 | cur_trans->num_writers--; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 459 | |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 460 | smp_mb(); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 461 | if (waitqueue_active(&cur_trans->writer_wait)) |
| 462 | wake_up(&cur_trans->writer_wait); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 463 | put_transaction(cur_trans); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 464 | if (lock) |
| 465 | mutex_unlock(&info->trans_mutex); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 466 | |
| 467 | if (current->journal_info == trans) |
| 468 | current->journal_info = NULL; |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 469 | memset(trans, 0, sizeof(*trans)); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 470 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 471 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 472 | if (throttle) |
| 473 | btrfs_run_delayed_iputs(root); |
| 474 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 475 | return 0; |
| 476 | } |
| 477 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 478 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
| 479 | struct btrfs_root *root) |
| 480 | { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 481 | return __btrfs_end_transaction(trans, root, 0, 1); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 482 | } |
| 483 | |
| 484 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, |
| 485 | struct btrfs_root *root) |
| 486 | { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 487 | return __btrfs_end_transaction(trans, root, 1, 1); |
| 488 | } |
| 489 | |
| 490 | int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, |
| 491 | struct btrfs_root *root) |
| 492 | { |
| 493 | return __btrfs_end_transaction(trans, root, 0, 0); |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 494 | } |
| 495 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 496 | /* |
| 497 | * when btree blocks are allocated, they have some corresponding bits set for |
| 498 | * 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] | 499 | * those extents are sent to disk but does not wait on them |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 500 | */ |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 501 | int btrfs_write_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 502 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 503 | { |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 504 | int ret; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 505 | int err = 0; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 506 | int werr = 0; |
| 507 | struct page *page; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 508 | struct inode *btree_inode = root->fs_info->btree_inode; |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 509 | u64 start = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 510 | u64 end; |
| 511 | unsigned long index; |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 512 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 513 | while (1) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 514 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 515 | mark); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 516 | if (ret) |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 517 | break; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 518 | while (start <= end) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 519 | cond_resched(); |
| 520 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 521 | index = start >> PAGE_CACHE_SHIFT; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 522 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 523 | page = find_get_page(btree_inode->i_mapping, index); |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 524 | if (!page) |
| 525 | continue; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 526 | |
| 527 | btree_lock_page_hook(page); |
| 528 | if (!page->mapping) { |
| 529 | unlock_page(page); |
| 530 | page_cache_release(page); |
| 531 | continue; |
| 532 | } |
| 533 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 534 | if (PageWriteback(page)) { |
| 535 | if (PageDirty(page)) |
| 536 | wait_on_page_writeback(page); |
| 537 | else { |
| 538 | unlock_page(page); |
| 539 | page_cache_release(page); |
| 540 | continue; |
| 541 | } |
| 542 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 543 | err = write_one_page(page, 0); |
| 544 | if (err) |
| 545 | werr = err; |
| 546 | page_cache_release(page); |
| 547 | } |
| 548 | } |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 549 | if (err) |
| 550 | werr = err; |
| 551 | return werr; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * when btree blocks are allocated, they have some corresponding bits set for |
| 556 | * them in one of two extent_io trees. This is used to make sure all of |
| 557 | * those extents are on disk for transaction or log commit. We wait |
| 558 | * on all the pages and clear them from the dirty pages state tree |
| 559 | */ |
| 560 | int btrfs_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 561 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 562 | { |
| 563 | int ret; |
| 564 | int err = 0; |
| 565 | int werr = 0; |
| 566 | struct page *page; |
| 567 | struct inode *btree_inode = root->fs_info->btree_inode; |
| 568 | u64 start = 0; |
| 569 | u64 end; |
| 570 | unsigned long index; |
| 571 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 572 | while (1) { |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 573 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, |
| 574 | mark); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 575 | if (ret) |
| 576 | break; |
| 577 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 578 | clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 579 | while (start <= end) { |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 580 | index = start >> PAGE_CACHE_SHIFT; |
| 581 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
| 582 | page = find_get_page(btree_inode->i_mapping, index); |
| 583 | if (!page) |
| 584 | continue; |
| 585 | if (PageDirty(page)) { |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 586 | btree_lock_page_hook(page); |
| 587 | wait_on_page_writeback(page); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 588 | err = write_one_page(page, 0); |
| 589 | if (err) |
| 590 | werr = err; |
| 591 | } |
Chris Mason | 105d931 | 2008-11-18 12:13:12 -0500 | [diff] [blame] | 592 | wait_on_page_writeback(page); |
Chris Mason | 777e6bd | 2008-08-15 15:34:15 -0400 | [diff] [blame] | 593 | page_cache_release(page); |
| 594 | cond_resched(); |
| 595 | } |
| 596 | } |
Chris Mason | 7c4452b | 2007-04-28 09:29:35 -0400 | [diff] [blame] | 597 | if (err) |
| 598 | werr = err; |
| 599 | return werr; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 600 | } |
| 601 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 602 | /* |
| 603 | * when btree blocks are allocated, they have some corresponding bits set for |
| 604 | * them in one of two extent_io trees. This is used to make sure all of |
| 605 | * those extents are on disk for transaction or log commit |
| 606 | */ |
| 607 | int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 608 | struct extent_io_tree *dirty_pages, int mark) |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 609 | { |
| 610 | int ret; |
| 611 | int ret2; |
| 612 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 613 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
| 614 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 615 | return ret || ret2; |
| 616 | } |
| 617 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 618 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
| 619 | struct btrfs_root *root) |
| 620 | { |
| 621 | if (!trans || !trans->transaction) { |
| 622 | struct inode *btree_inode; |
| 623 | btree_inode = root->fs_info->btree_inode; |
| 624 | return filemap_write_and_wait(btree_inode->i_mapping); |
| 625 | } |
| 626 | return btrfs_write_and_wait_marked_extents(root, |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 627 | &trans->transaction->dirty_pages, |
| 628 | EXTENT_DIRTY); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 629 | } |
| 630 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 631 | /* |
| 632 | * this is used to update the root pointer in the tree of tree roots. |
| 633 | * |
| 634 | * But, in the case of the extent allocation tree, updating the root |
| 635 | * pointer may allocate blocks which may change the root of the extent |
| 636 | * allocation tree. |
| 637 | * |
| 638 | * So, this loops and repeats and makes sure the cowonly root didn't |
| 639 | * change while the root pointer was being updated in the metadata. |
| 640 | */ |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 641 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
| 642 | struct btrfs_root *root) |
| 643 | { |
| 644 | int ret; |
| 645 | u64 old_root_bytenr; |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 646 | u64 old_root_used; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 647 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 648 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 649 | old_root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 650 | btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 651 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 652 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 653 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 654 | if (old_root_bytenr == root->node->start && |
| 655 | old_root_used == btrfs_root_used(&root->root_item)) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 656 | break; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 657 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 658 | btrfs_set_root_node(&root->root_item, root->node); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 659 | ret = btrfs_update_root(trans, tree_root, |
| 660 | &root->root_key, |
| 661 | &root->root_item); |
| 662 | BUG_ON(ret); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 663 | |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 664 | old_root_used = btrfs_root_used(&root->root_item); |
Yan Zheng | 4a8c9a6 | 2009-07-22 10:07:05 -0400 | [diff] [blame] | 665 | ret = btrfs_write_dirty_block_groups(trans, root); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 666 | BUG_ON(ret); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 667 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 668 | |
| 669 | if (root != root->fs_info->extent_root) |
| 670 | switch_commit_root(root); |
| 671 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 672 | return 0; |
| 673 | } |
| 674 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 675 | /* |
| 676 | * update all the cowonly tree roots on disk |
| 677 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 678 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
| 679 | struct btrfs_root *root) |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 680 | { |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 681 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 682 | struct list_head *next; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 683 | struct extent_buffer *eb; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 684 | int ret; |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 685 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 686 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 687 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 688 | |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 689 | eb = btrfs_lock_root_node(fs_info->tree_root); |
Chris Mason | 9fa8cfe | 2009-03-13 10:24:59 -0400 | [diff] [blame] | 690 | btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 691 | btrfs_tree_unlock(eb); |
| 692 | free_extent_buffer(eb); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 693 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 694 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 695 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 696 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 697 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 698 | next = fs_info->dirty_cowonly_roots.next; |
| 699 | list_del_init(next); |
| 700 | root = list_entry(next, struct btrfs_root, dirty_list); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 701 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 702 | update_cowonly_root(trans, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 703 | } |
Yan Zheng | 276e680 | 2009-07-30 09:40:40 -0400 | [diff] [blame] | 704 | |
| 705 | down_write(&fs_info->extent_commit_sem); |
| 706 | switch_commit_root(fs_info->extent_root); |
| 707 | up_write(&fs_info->extent_commit_sem); |
| 708 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 709 | return 0; |
| 710 | } |
| 711 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 712 | /* |
| 713 | * dead roots are old snapshots that need to be deleted. This allocates |
| 714 | * a dirty root struct and adds it into the list of dead roots that need to |
| 715 | * be deleted |
| 716 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 717 | int btrfs_add_dead_root(struct btrfs_root *root) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 718 | { |
Yan Zheng | b48652c | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 719 | mutex_lock(&root->fs_info->trans_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 720 | list_add(&root->root_list, &root->fs_info->dead_roots); |
Yan Zheng | b48652c | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 721 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 722 | return 0; |
| 723 | } |
| 724 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 725 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 726 | * update all the cowonly tree roots on disk |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 727 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 728 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
| 729 | struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 730 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 731 | struct btrfs_root *gang[8]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 732 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 733 | int i; |
| 734 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 735 | int err = 0; |
| 736 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 737 | while (1) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 738 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
| 739 | (void **)gang, 0, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 740 | ARRAY_SIZE(gang), |
| 741 | BTRFS_ROOT_TRANS_TAG); |
| 742 | if (ret == 0) |
| 743 | break; |
| 744 | for (i = 0; i < ret; i++) { |
| 745 | root = gang[i]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 746 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
| 747 | (unsigned long)root->root_key.objectid, |
| 748 | BTRFS_ROOT_TRANS_TAG); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 749 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 750 | btrfs_free_log(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 751 | btrfs_update_reloc_root(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 752 | btrfs_orphan_commit_root(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 753 | |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 754 | if (root->commit_root != root->node) { |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 755 | switch_commit_root(root); |
Yan Zheng | 978d910 | 2009-06-15 20:01:02 -0400 | [diff] [blame] | 756 | btrfs_set_root_node(&root->root_item, |
| 757 | root->node); |
| 758 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 759 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 760 | err = btrfs_update_root(trans, fs_info->tree_root, |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 761 | &root->root_key, |
| 762 | &root->root_item); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 763 | if (err) |
| 764 | break; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 765 | } |
| 766 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 767 | return err; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 768 | } |
| 769 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 770 | /* |
| 771 | * defrag a given btree. If cacheonly == 1, this won't read from the disk, |
| 772 | * otherwise every leaf in the btree is read and defragged. |
| 773 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 774 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
| 775 | { |
| 776 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 777 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 778 | int ret; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 779 | unsigned long nr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 780 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 781 | if (xchg(&root->defrag_running, 1)) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 782 | return 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 783 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 784 | while (1) { |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 785 | trans = btrfs_start_transaction(root, 0); |
| 786 | if (IS_ERR(trans)) |
| 787 | return PTR_ERR(trans); |
| 788 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 789 | ret = btrfs_defrag_leaves(trans, root, cacheonly); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 790 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 791 | nr = trans->blocks_used; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 792 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 793 | btrfs_btree_balance_dirty(info->tree_root, nr); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 794 | cond_resched(); |
| 795 | |
Chris Mason | 3f157a2 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 796 | if (root->fs_info->closing || ret != -EAGAIN) |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 797 | break; |
| 798 | } |
| 799 | root->defrag_running = 0; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 800 | return ret; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 801 | } |
| 802 | |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 803 | #if 0 |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 804 | /* |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 805 | * when dropping snapshots, we generate a ton of delayed refs, and it makes |
| 806 | * sense not to join the transaction while it is trying to flush the current |
| 807 | * queue of delayed refs out. |
| 808 | * |
| 809 | * This is used by the drop snapshot code only |
| 810 | */ |
| 811 | static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info) |
| 812 | { |
| 813 | DEFINE_WAIT(wait); |
| 814 | |
| 815 | mutex_lock(&info->trans_mutex); |
| 816 | while (info->running_transaction && |
| 817 | info->running_transaction->delayed_refs.flushing) { |
| 818 | prepare_to_wait(&info->transaction_wait, &wait, |
| 819 | TASK_UNINTERRUPTIBLE); |
| 820 | mutex_unlock(&info->trans_mutex); |
Chris Mason | 59bc5c7 | 2009-04-24 14:39:25 -0400 | [diff] [blame] | 821 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 822 | schedule(); |
Chris Mason | 59bc5c7 | 2009-04-24 14:39:25 -0400 | [diff] [blame] | 823 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 824 | mutex_lock(&info->trans_mutex); |
| 825 | finish_wait(&info->transaction_wait, &wait); |
| 826 | } |
| 827 | mutex_unlock(&info->trans_mutex); |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 832 | * Given a list of roots that need to be deleted, call btrfs_drop_snapshot on |
| 833 | * all of them |
| 834 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 835 | int btrfs_drop_dead_root(struct btrfs_root *root) |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 836 | { |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 837 | struct btrfs_trans_handle *trans; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 838 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 839 | unsigned long nr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 840 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 841 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 842 | while (1) { |
| 843 | /* |
| 844 | * we don't want to jump in and create a bunch of |
| 845 | * delayed refs if the transaction is starting to close |
| 846 | */ |
| 847 | wait_transaction_pre_flush(tree_root->fs_info); |
| 848 | trans = btrfs_start_transaction(tree_root, 1); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 849 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 850 | /* |
| 851 | * we've joined a transaction, make sure it isn't |
| 852 | * closing right now |
| 853 | */ |
| 854 | if (trans->transaction->delayed_refs.flushing) { |
| 855 | btrfs_end_transaction(trans, tree_root); |
| 856 | continue; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 857 | } |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 858 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 859 | ret = btrfs_drop_snapshot(trans, root); |
| 860 | if (ret != -EAGAIN) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 861 | break; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 862 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 863 | ret = btrfs_update_root(trans, tree_root, |
| 864 | &root->root_key, |
| 865 | &root->root_item); |
| 866 | if (ret) |
| 867 | break; |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 868 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 869 | nr = trans->blocks_used; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 870 | ret = btrfs_end_transaction(trans, tree_root); |
| 871 | BUG_ON(ret); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 872 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 873 | btrfs_btree_balance_dirty(tree_root, nr); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 874 | cond_resched(); |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 875 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 876 | BUG_ON(ret); |
| 877 | |
| 878 | ret = btrfs_del_root(trans, tree_root, &root->root_key); |
| 879 | BUG_ON(ret); |
| 880 | |
| 881 | nr = trans->blocks_used; |
| 882 | ret = btrfs_end_transaction(trans, tree_root); |
| 883 | BUG_ON(ret); |
| 884 | |
| 885 | free_extent_buffer(root->node); |
| 886 | free_extent_buffer(root->commit_root); |
| 887 | kfree(root); |
| 888 | |
| 889 | btrfs_btree_balance_dirty(tree_root, nr); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 890 | return ret; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 891 | } |
Yan Zheng | 2c47e605 | 2009-06-27 21:07:35 -0400 | [diff] [blame] | 892 | #endif |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 893 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 894 | /* |
| 895 | * new snapshots need to be created at a very specific time in the |
| 896 | * transaction commit. This does the actual creation |
| 897 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 898 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 899 | struct btrfs_fs_info *fs_info, |
| 900 | struct btrfs_pending_snapshot *pending) |
| 901 | { |
| 902 | struct btrfs_key key; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 903 | struct btrfs_root_item *new_root_item; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 904 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 905 | struct btrfs_root *root = pending->root; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 906 | struct btrfs_root *parent_root; |
| 907 | struct inode *parent_inode; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 908 | struct dentry *parent; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 909 | struct dentry *dentry; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 910 | struct extent_buffer *tmp; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 911 | struct extent_buffer *old; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 912 | int ret; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 913 | u64 to_reserve = 0; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 914 | u64 index = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 915 | u64 objectid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 916 | u64 root_flags; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 917 | |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 918 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
| 919 | if (!new_root_item) { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 920 | pending->error = -ENOMEM; |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 921 | goto fail; |
| 922 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 923 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 924 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 925 | if (ret) { |
| 926 | pending->error = ret; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 927 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 928 | } |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 929 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 930 | btrfs_reloc_pre_snapshot(trans, pending, &to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 931 | btrfs_orphan_pre_snapshot(trans, pending, &to_reserve); |
| 932 | |
| 933 | if (to_reserve > 0) { |
| 934 | ret = btrfs_block_rsv_add(trans, root, &pending->block_rsv, |
Josef Bacik | 8bb8ab2 | 2010-10-15 16:52:49 -0400 | [diff] [blame] | 935 | to_reserve); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 936 | if (ret) { |
| 937 | pending->error = ret; |
| 938 | goto fail; |
| 939 | } |
| 940 | } |
| 941 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 942 | key.objectid = objectid; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 943 | key.offset = (u64)-1; |
| 944 | key.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 945 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 946 | trans->block_rsv = &pending->block_rsv; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 947 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 948 | dentry = pending->dentry; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 949 | parent = dget_parent(dentry); |
| 950 | parent_inode = parent->d_inode; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 951 | parent_root = BTRFS_I(parent_inode)->root; |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 952 | record_root_in_trans(trans, parent_root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 953 | |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 954 | /* |
| 955 | * insert the directory item |
| 956 | */ |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 957 | ret = btrfs_set_inode_index(parent_inode, &index); |
| 958 | BUG_ON(ret); |
| 959 | ret = btrfs_insert_dir_item(trans, parent_root, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 960 | dentry->d_name.name, dentry->d_name.len, |
| 961 | parent_inode->i_ino, &key, |
| 962 | BTRFS_FT_DIR, index); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 963 | BUG_ON(ret); |
| 964 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 965 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
| 966 | dentry->d_name.len * 2); |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 967 | ret = btrfs_update_inode(trans, parent_root, parent_inode); |
| 968 | BUG_ON(ret); |
| 969 | |
| 970 | record_root_in_trans(trans, root); |
| 971 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
| 972 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
| 973 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 974 | root_flags = btrfs_root_flags(new_root_item); |
| 975 | if (pending->readonly) |
| 976 | root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; |
| 977 | else |
| 978 | root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; |
| 979 | btrfs_set_root_flags(new_root_item, root_flags); |
| 980 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 981 | old = btrfs_lock_root_node(root); |
Chris Mason | 9fa8cfe | 2009-03-13 10:24:59 -0400 | [diff] [blame] | 982 | btrfs_cow_block(trans, root, old, NULL, 0, &old); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 983 | btrfs_set_lock_blocking(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 984 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 985 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
| 986 | btrfs_tree_unlock(old); |
| 987 | free_extent_buffer(old); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 988 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 989 | btrfs_set_root_node(new_root_item, tmp); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 990 | /* record when the snapshot was created in key.offset */ |
| 991 | key.offset = trans->transid; |
| 992 | ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 993 | btrfs_tree_unlock(tmp); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 994 | free_extent_buffer(tmp); |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 995 | BUG_ON(ret); |
| 996 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 997 | /* |
| 998 | * insert root back/forward references |
| 999 | */ |
| 1000 | ret = btrfs_add_root_ref(trans, tree_root, objectid, |
| 1001 | parent_root->root_key.objectid, |
| 1002 | parent_inode->i_ino, index, |
| 1003 | dentry->d_name.name, dentry->d_name.len); |
| 1004 | BUG_ON(ret); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 1005 | dput(parent); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1006 | |
| 1007 | key.offset = (u64)-1; |
| 1008 | pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); |
| 1009 | BUG_ON(IS_ERR(pending->snap)); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1010 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1011 | btrfs_reloc_post_snapshot(trans, pending); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1012 | btrfs_orphan_post_snapshot(trans, pending); |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1013 | fail: |
Sage Weil | 6bdb72d | 2010-03-15 17:27:13 +0000 | [diff] [blame] | 1014 | kfree(new_root_item); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1015 | btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1); |
| 1016 | return 0; |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1017 | } |
| 1018 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1019 | /* |
| 1020 | * create all the snapshots we've scheduled for creation |
| 1021 | */ |
Chris Mason | 80b6794 | 2008-02-01 16:35:04 -0500 | [diff] [blame] | 1022 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
| 1023 | struct btrfs_fs_info *fs_info) |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1024 | { |
| 1025 | struct btrfs_pending_snapshot *pending; |
| 1026 | struct list_head *head = &trans->transaction->pending_snapshots; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1027 | int ret; |
| 1028 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1029 | list_for_each_entry(pending, head, list) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1030 | ret = create_pending_snapshot(trans, fs_info, pending); |
| 1031 | BUG_ON(ret); |
| 1032 | } |
| 1033 | return 0; |
| 1034 | } |
| 1035 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1036 | static void update_super_roots(struct btrfs_root *root) |
| 1037 | { |
| 1038 | struct btrfs_root_item *root_item; |
| 1039 | struct btrfs_super_block *super; |
| 1040 | |
| 1041 | super = &root->fs_info->super_copy; |
| 1042 | |
| 1043 | root_item = &root->fs_info->chunk_root->root_item; |
| 1044 | super->chunk_root = root_item->bytenr; |
| 1045 | super->chunk_root_generation = root_item->generation; |
| 1046 | super->chunk_root_level = root_item->level; |
| 1047 | |
| 1048 | root_item = &root->fs_info->tree_root->root_item; |
| 1049 | super->root = root_item->bytenr; |
| 1050 | super->generation = root_item->generation; |
| 1051 | super->root_level = root_item->level; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 1052 | if (super->cache_generation != 0 || btrfs_test_opt(root, SPACE_CACHE)) |
| 1053 | super->cache_generation = root_item->generation; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1054 | } |
| 1055 | |
Chris Mason | f36f304 | 2009-07-30 10:04:48 -0400 | [diff] [blame] | 1056 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
| 1057 | { |
| 1058 | int ret = 0; |
| 1059 | spin_lock(&info->new_trans_lock); |
| 1060 | if (info->running_transaction) |
| 1061 | ret = info->running_transaction->in_commit; |
| 1062 | spin_unlock(&info->new_trans_lock); |
| 1063 | return ret; |
| 1064 | } |
| 1065 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1066 | int btrfs_transaction_blocked(struct btrfs_fs_info *info) |
| 1067 | { |
| 1068 | int ret = 0; |
| 1069 | spin_lock(&info->new_trans_lock); |
| 1070 | if (info->running_transaction) |
| 1071 | ret = info->running_transaction->blocked; |
| 1072 | spin_unlock(&info->new_trans_lock); |
| 1073 | return ret; |
| 1074 | } |
| 1075 | |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1076 | /* |
| 1077 | * wait for the current transaction commit to start and block subsequent |
| 1078 | * transaction joins |
| 1079 | */ |
| 1080 | static void wait_current_trans_commit_start(struct btrfs_root *root, |
| 1081 | struct btrfs_transaction *trans) |
| 1082 | { |
| 1083 | DEFINE_WAIT(wait); |
| 1084 | |
| 1085 | if (trans->in_commit) |
| 1086 | return; |
| 1087 | |
| 1088 | while (1) { |
| 1089 | prepare_to_wait(&root->fs_info->transaction_blocked_wait, &wait, |
| 1090 | TASK_UNINTERRUPTIBLE); |
| 1091 | if (trans->in_commit) { |
| 1092 | finish_wait(&root->fs_info->transaction_blocked_wait, |
| 1093 | &wait); |
| 1094 | break; |
| 1095 | } |
| 1096 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1097 | schedule(); |
| 1098 | mutex_lock(&root->fs_info->trans_mutex); |
| 1099 | finish_wait(&root->fs_info->transaction_blocked_wait, &wait); |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | /* |
| 1104 | * wait for the current transaction to start and then become unblocked. |
| 1105 | * caller holds ref. |
| 1106 | */ |
| 1107 | static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, |
| 1108 | struct btrfs_transaction *trans) |
| 1109 | { |
| 1110 | DEFINE_WAIT(wait); |
| 1111 | |
| 1112 | if (trans->commit_done || (trans->in_commit && !trans->blocked)) |
| 1113 | return; |
| 1114 | |
| 1115 | while (1) { |
| 1116 | prepare_to_wait(&root->fs_info->transaction_wait, &wait, |
| 1117 | TASK_UNINTERRUPTIBLE); |
| 1118 | if (trans->commit_done || |
| 1119 | (trans->in_commit && !trans->blocked)) { |
| 1120 | finish_wait(&root->fs_info->transaction_wait, |
| 1121 | &wait); |
| 1122 | break; |
| 1123 | } |
| 1124 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1125 | schedule(); |
| 1126 | mutex_lock(&root->fs_info->trans_mutex); |
| 1127 | finish_wait(&root->fs_info->transaction_wait, |
| 1128 | &wait); |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * commit transactions asynchronously. once btrfs_commit_transaction_async |
| 1134 | * returns, any subsequent transaction will not be allowed to join. |
| 1135 | */ |
| 1136 | struct btrfs_async_commit { |
| 1137 | struct btrfs_trans_handle *newtrans; |
| 1138 | struct btrfs_root *root; |
| 1139 | struct delayed_work work; |
| 1140 | }; |
| 1141 | |
| 1142 | static void do_async_commit(struct work_struct *work) |
| 1143 | { |
| 1144 | struct btrfs_async_commit *ac = |
| 1145 | container_of(work, struct btrfs_async_commit, work.work); |
| 1146 | |
| 1147 | btrfs_commit_transaction(ac->newtrans, ac->root); |
| 1148 | kfree(ac); |
| 1149 | } |
| 1150 | |
| 1151 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
| 1152 | struct btrfs_root *root, |
| 1153 | int wait_for_unblock) |
| 1154 | { |
| 1155 | struct btrfs_async_commit *ac; |
| 1156 | struct btrfs_transaction *cur_trans; |
| 1157 | |
| 1158 | ac = kmalloc(sizeof(*ac), GFP_NOFS); |
| 1159 | BUG_ON(!ac); |
| 1160 | |
| 1161 | INIT_DELAYED_WORK(&ac->work, do_async_commit); |
| 1162 | ac->root = root; |
| 1163 | ac->newtrans = btrfs_join_transaction(root, 0); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1164 | if (IS_ERR(ac->newtrans)) { |
| 1165 | int err = PTR_ERR(ac->newtrans); |
| 1166 | kfree(ac); |
| 1167 | return err; |
| 1168 | } |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1169 | |
| 1170 | /* take transaction reference */ |
| 1171 | mutex_lock(&root->fs_info->trans_mutex); |
| 1172 | cur_trans = trans->transaction; |
| 1173 | cur_trans->use_count++; |
| 1174 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1175 | |
| 1176 | btrfs_end_transaction(trans, root); |
| 1177 | schedule_delayed_work(&ac->work, 0); |
| 1178 | |
| 1179 | /* wait for transaction to start and unblock */ |
| 1180 | mutex_lock(&root->fs_info->trans_mutex); |
| 1181 | if (wait_for_unblock) |
| 1182 | wait_current_trans_commit_start_and_unblock(root, cur_trans); |
| 1183 | else |
| 1184 | wait_current_trans_commit_start(root, cur_trans); |
| 1185 | put_transaction(cur_trans); |
| 1186 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1187 | |
| 1188 | return 0; |
| 1189 | } |
| 1190 | |
| 1191 | /* |
| 1192 | * btrfs_transaction state sequence: |
| 1193 | * in_commit = 0, blocked = 0 (initial) |
| 1194 | * in_commit = 1, blocked = 1 |
| 1195 | * blocked = 0 |
| 1196 | * commit_done = 1 |
| 1197 | */ |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1198 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| 1199 | struct btrfs_root *root) |
| 1200 | { |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1201 | unsigned long joined = 0; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1202 | struct btrfs_transaction *cur_trans; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1203 | struct btrfs_transaction *prev_trans = NULL; |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1204 | DEFINE_WAIT(wait); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1205 | int ret; |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1206 | int should_grow = 0; |
| 1207 | unsigned long now = get_seconds(); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 1208 | int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1209 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1210 | btrfs_run_ordered_operations(root, 0); |
| 1211 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1212 | /* make a pass through all the delayed refs we have so far |
| 1213 | * any runnings procs may add more while we are here |
| 1214 | */ |
| 1215 | ret = btrfs_run_delayed_refs(trans, root, 0); |
| 1216 | BUG_ON(ret); |
| 1217 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1218 | btrfs_trans_release_metadata(trans, root); |
| 1219 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1220 | cur_trans = trans->transaction; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1221 | /* |
| 1222 | * set the flushing flag so procs in this transaction have to |
| 1223 | * start sending their work down. |
| 1224 | */ |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1225 | cur_trans->delayed_refs.flushing = 1; |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1226 | |
Chris Mason | c3e69d5 | 2009-03-13 10:17:05 -0400 | [diff] [blame] | 1227 | ret = btrfs_run_delayed_refs(trans, root, 0); |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1228 | BUG_ON(ret); |
| 1229 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1230 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1231 | if (cur_trans->in_commit) { |
| 1232 | cur_trans->use_count++; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1233 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1234 | btrfs_end_transaction(trans, root); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1235 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1236 | ret = wait_for_commit(root, cur_trans); |
| 1237 | BUG_ON(ret); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1238 | |
| 1239 | mutex_lock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1240 | put_transaction(cur_trans); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1241 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1242 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1243 | return 0; |
| 1244 | } |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1245 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1246 | trans->transaction->in_commit = 1; |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1247 | trans->transaction->blocked = 1; |
Sage Weil | bb9c12c | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1248 | wake_up(&root->fs_info->transaction_blocked_wait); |
| 1249 | |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1250 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
| 1251 | prev_trans = list_entry(cur_trans->list.prev, |
| 1252 | struct btrfs_transaction, list); |
| 1253 | if (!prev_trans->commit_done) { |
| 1254 | prev_trans->use_count++; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1255 | mutex_unlock(&root->fs_info->trans_mutex); |
| 1256 | |
| 1257 | wait_for_commit(root, prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1258 | |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1259 | mutex_lock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1260 | put_transaction(prev_trans); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1261 | } |
| 1262 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1263 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1264 | if (now < cur_trans->start_time || now - cur_trans->start_time < 1) |
| 1265 | should_grow = 1; |
| 1266 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1267 | do { |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1268 | int snap_pending = 0; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1269 | joined = cur_trans->num_joined; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1270 | if (!list_empty(&trans->transaction->pending_snapshots)) |
| 1271 | snap_pending = 1; |
| 1272 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1273 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1274 | mutex_unlock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1275 | |
Sage Weil | 0bdb1db | 2010-02-19 14:13:50 -0800 | [diff] [blame] | 1276 | if (flush_on_commit || snap_pending) { |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1277 | btrfs_start_delalloc_inodes(root, 1); |
| 1278 | ret = btrfs_wait_ordered_extents(root, 0, 1); |
Sage Weil | ebecd3d | 2009-07-24 13:17:44 -0400 | [diff] [blame] | 1279 | BUG_ON(ret); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1280 | } |
| 1281 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1282 | /* |
| 1283 | * rename don't use btrfs_join_transaction, so, once we |
| 1284 | * set the transaction to blocked above, we aren't going |
| 1285 | * to get any new ordered operations. We can safely run |
| 1286 | * it here and no for sure that nothing new will be added |
| 1287 | * to the list |
| 1288 | */ |
| 1289 | btrfs_run_ordered_operations(root, 1); |
| 1290 | |
Chris Mason | ed3b3d314 | 2010-05-25 10:12:41 -0400 | [diff] [blame] | 1291 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
| 1292 | TASK_UNINTERRUPTIBLE); |
| 1293 | |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1294 | smp_mb(); |
Sage Weil | 99d16cb | 2010-10-29 15:37:34 -0400 | [diff] [blame] | 1295 | if (cur_trans->num_writers > 1) |
| 1296 | schedule_timeout(MAX_SCHEDULE_TIMEOUT); |
| 1297 | else if (should_grow) |
| 1298 | schedule_timeout(1); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1299 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1300 | mutex_lock(&root->fs_info->trans_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1301 | finish_wait(&cur_trans->writer_wait, &wait); |
| 1302 | } while (cur_trans->num_writers > 1 || |
Chris Mason | 89573b9 | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1303 | (should_grow && cur_trans->num_joined != joined)); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1304 | |
Chris Mason | 3063d29 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1305 | ret = create_pending_snapshots(trans, root->fs_info); |
| 1306 | BUG_ON(ret); |
| 1307 | |
Chris Mason | 56bec29 | 2009-03-13 10:10:06 -0400 | [diff] [blame] | 1308 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
| 1309 | BUG_ON(ret); |
| 1310 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1311 | WARN_ON(cur_trans != trans->transaction); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1312 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1313 | /* btrfs_commit_tree_roots is responsible for getting the |
| 1314 | * various roots consistent with each other. Every pointer |
| 1315 | * in the tree of tree roots has to point to the most up to date |
| 1316 | * root for every subvolume and other tree. So, we have to keep |
| 1317 | * the tree logging code from jumping in and changing any |
| 1318 | * of the trees. |
| 1319 | * |
| 1320 | * At this point in the commit, there can't be any tree-log |
| 1321 | * writers, but a little lower down we drop the trans mutex |
| 1322 | * and let new people in. By holding the tree_log_mutex |
| 1323 | * from now until after the super is written, we avoid races |
| 1324 | * with the tree-log code. |
| 1325 | */ |
| 1326 | mutex_lock(&root->fs_info->tree_log_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1327 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1328 | ret = commit_fs_roots(trans, root); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1329 | BUG_ON(ret); |
| 1330 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1331 | /* 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] | 1332 | * safe to free the root of tree log roots |
| 1333 | */ |
| 1334 | btrfs_free_log_root_tree(trans, root->fs_info); |
| 1335 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1336 | ret = commit_cowonly_roots(trans, root); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1337 | BUG_ON(ret); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1338 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1339 | btrfs_prepare_extent_commit(trans, root); |
| 1340 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1341 | cur_trans = root->fs_info->running_transaction; |
Chris Mason | cee36a0 | 2008-01-15 08:40:48 -0500 | [diff] [blame] | 1342 | spin_lock(&root->fs_info->new_trans_lock); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1343 | root->fs_info->running_transaction = NULL; |
Chris Mason | cee36a0 | 2008-01-15 08:40:48 -0500 | [diff] [blame] | 1344 | spin_unlock(&root->fs_info->new_trans_lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1345 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1346 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, |
| 1347 | root->fs_info->tree_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1348 | switch_commit_root(root->fs_info->tree_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1349 | |
| 1350 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, |
| 1351 | root->fs_info->chunk_root->node); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1352 | switch_commit_root(root->fs_info->chunk_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1353 | |
| 1354 | update_super_roots(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1355 | |
| 1356 | if (!root->fs_info->log_root_recovering) { |
| 1357 | btrfs_set_super_log_root(&root->fs_info->super_copy, 0); |
| 1358 | btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0); |
| 1359 | } |
| 1360 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1361 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
| 1362 | sizeof(root->fs_info->super_copy)); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1363 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1364 | trans->transaction->blocked = 0; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1365 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1366 | wake_up(&root->fs_info->transaction_wait); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1367 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1368 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1369 | ret = btrfs_write_and_wait_transaction(trans, root); |
| 1370 | BUG_ON(ret); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 1371 | write_ctree_super(trans, root, 0); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1372 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1373 | /* |
| 1374 | * the super is written, we can safely allow the tree-loggers |
| 1375 | * to go about their business |
| 1376 | */ |
| 1377 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 1378 | |
Yan Zheng | 11833d6 | 2009-09-11 16:11:19 -0400 | [diff] [blame] | 1379 | btrfs_finish_extent_commit(trans, root); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 1380 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 1381 | mutex_lock(&root->fs_info->trans_mutex); |
| 1382 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1383 | cur_trans->commit_done = 1; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1384 | |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1385 | root->fs_info->last_trans_committed = cur_trans->transid; |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1386 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1387 | wake_up(&cur_trans->commit_wait); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1388 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1389 | put_transaction(cur_trans); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1390 | put_transaction(cur_trans); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1391 | |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1392 | mutex_unlock(&root->fs_info->trans_mutex); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1393 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1394 | if (current->journal_info == trans) |
| 1395 | current->journal_info = NULL; |
| 1396 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1397 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1398 | |
| 1399 | if (current != root->fs_info->transaction_kthread) |
| 1400 | btrfs_run_delayed_iputs(root); |
| 1401 | |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 1402 | return ret; |
| 1403 | } |
| 1404 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1405 | /* |
| 1406 | * interface function to delete all the snapshots we have scheduled for deletion |
| 1407 | */ |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1408 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
| 1409 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1410 | LIST_HEAD(list); |
| 1411 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1412 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1413 | mutex_lock(&fs_info->trans_mutex); |
| 1414 | list_splice_init(&fs_info->dead_roots, &list); |
| 1415 | mutex_unlock(&fs_info->trans_mutex); |
| 1416 | |
| 1417 | while (!list_empty(&list)) { |
| 1418 | root = list_entry(list.next, struct btrfs_root, root_list); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1419 | list_del(&root->root_list); |
| 1420 | |
| 1421 | if (btrfs_header_backref_rev(root->node) < |
| 1422 | BTRFS_MIXED_BACKREF_REV) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1423 | btrfs_drop_snapshot(root, NULL, 0); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1424 | else |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1425 | btrfs_drop_snapshot(root, NULL, 1); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1426 | } |
| 1427 | return 0; |
| 1428 | } |