Btrfs: check free space in block group before searching for a cluster
[linux-2.6.git] / fs / btrfs / transaction.h
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
19 #ifndef __BTRFS_TRANSACTION__
20 #define __BTRFS_TRANSACTION__
21 #include "btrfs_inode.h"
22 #include "delayed-ref.h"
23
24 struct btrfs_transaction {
25         u64 transid;
26         /*
27          * total writers in this transaction, it must be zero before the
28          * transaction can end
29          */
30         unsigned long num_writers;
31
32         unsigned long num_joined;
33         int in_commit;
34         int use_count;
35         int commit_done;
36         int blocked;
37         struct list_head list;
38         struct extent_io_tree dirty_pages;
39         unsigned long start_time;
40         wait_queue_head_t writer_wait;
41         wait_queue_head_t commit_wait;
42         struct list_head pending_snapshots;
43         struct btrfs_delayed_ref_root delayed_refs;
44 };
45
46 struct btrfs_trans_handle {
47         u64 transid;
48         u64 block_group;
49         u64 bytes_reserved;
50         unsigned long blocks_reserved;
51         unsigned long blocks_used;
52         unsigned long delayed_ref_updates;
53         struct btrfs_transaction *transaction;
54         struct btrfs_block_rsv *block_rsv;
55 };
56
57 struct btrfs_pending_snapshot {
58         struct dentry *dentry;
59         struct btrfs_root *root;
60         struct btrfs_root *snap;
61         /* block reservation for the operation */
62         struct btrfs_block_rsv block_rsv;
63         /* extra metadata reseration for relocation */
64         int error;
65         bool readonly;
66         struct list_head list;
67 };
68
69 static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
70                                                struct inode *inode)
71 {
72         trans->block_group = BTRFS_I(inode)->block_group;
73 }
74
75 static inline void btrfs_update_inode_block_group(
76                                           struct btrfs_trans_handle *trans,
77                                           struct inode *inode)
78 {
79         BTRFS_I(inode)->block_group = trans->block_group;
80 }
81
82 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
83                                               struct inode *inode)
84 {
85         BTRFS_I(inode)->last_trans = trans->transaction->transid;
86         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
87 }
88
89 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
90                           struct btrfs_root *root);
91 int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
92                                  struct btrfs_root *root);
93 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
94                                                    int num_items);
95 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
96                                                   int num_blocks);
97 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root,
98                                                           int num_blocks);
99 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
100                                                          int num_blocks);
101 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
102 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
103                                      struct btrfs_root *root);
104 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
105                             struct btrfs_root *root);
106
107 int btrfs_add_dead_root(struct btrfs_root *root);
108 int btrfs_drop_dead_root(struct btrfs_root *root);
109 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
110 int btrfs_clean_old_snapshots(struct btrfs_root *root);
111 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
112                              struct btrfs_root *root);
113 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
114                                    struct btrfs_root *root,
115                                    int wait_for_unblock);
116 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
117                                    struct btrfs_root *root);
118 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
119                                  struct btrfs_root *root);
120 void btrfs_throttle(struct btrfs_root *root);
121 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
122                                 struct btrfs_root *root);
123 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
124                                 struct extent_io_tree *dirty_pages, int mark);
125 int btrfs_write_marked_extents(struct btrfs_root *root,
126                                 struct extent_io_tree *dirty_pages, int mark);
127 int btrfs_wait_marked_extents(struct btrfs_root *root,
128                                 struct extent_io_tree *dirty_pages, int mark);
129 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
130 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
131 #endif