btrfs: Remove code referencing unused TRANS_USERSPACE
[sfrench/cifs-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
22 #include <linux/refcount.h>
23 #include "btrfs_inode.h"
24 #include "delayed-ref.h"
25 #include "ctree.h"
26
27 enum btrfs_trans_state {
28         TRANS_STATE_RUNNING             = 0,
29         TRANS_STATE_BLOCKED             = 1,
30         TRANS_STATE_COMMIT_START        = 2,
31         TRANS_STATE_COMMIT_DOING        = 3,
32         TRANS_STATE_UNBLOCKED           = 4,
33         TRANS_STATE_COMPLETED           = 5,
34         TRANS_STATE_MAX                 = 6,
35 };
36
37 #define BTRFS_TRANS_HAVE_FREE_BGS       0
38 #define BTRFS_TRANS_DIRTY_BG_RUN        1
39 #define BTRFS_TRANS_CACHE_ENOSPC        2
40
41 struct btrfs_transaction {
42         u64 transid;
43         /*
44          * total external writers(USERSPACE/START/ATTACH) in this
45          * transaction, it must be zero before the transaction is
46          * being committed
47          */
48         atomic_t num_extwriters;
49         /*
50          * total writers in this transaction, it must be zero before the
51          * transaction can end
52          */
53         atomic_t num_writers;
54         refcount_t use_count;
55         atomic_t pending_ordered;
56
57         unsigned long flags;
58
59         /* Be protected by fs_info->trans_lock when we want to change it. */
60         enum btrfs_trans_state state;
61         int aborted;
62         struct list_head list;
63         struct extent_io_tree dirty_pages;
64         unsigned long start_time;
65         wait_queue_head_t writer_wait;
66         wait_queue_head_t commit_wait;
67         wait_queue_head_t pending_wait;
68         struct list_head pending_snapshots;
69         struct list_head pending_chunks;
70         struct list_head switch_commits;
71         struct list_head dirty_bgs;
72
73         /*
74          * There is no explicit lock which protects io_bgs, rather its
75          * consistency is implied by the fact that all the sites which modify
76          * it do so under some form of transaction critical section, namely:
77          *
78          * - btrfs_start_dirty_block_groups - This function can only ever be
79          *   run by one of the transaction committers. Refer to
80          *   BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction
81          *
82          * - btrfs_write_dirty_blockgroups - this is called by
83          *   commit_cowonly_roots from transaction critical section
84          *   (TRANS_STATE_COMMIT_DOING)
85          *
86          * - btrfs_cleanup_dirty_bgs - called on transaction abort
87          */
88         struct list_head io_bgs;
89         struct list_head dropped_roots;
90
91         /*
92          * we need to make sure block group deletion doesn't race with
93          * free space cache writeout.  This mutex keeps them from stomping
94          * on each other
95          */
96         struct mutex cache_write_mutex;
97         spinlock_t dirty_bgs_lock;
98         unsigned int num_dirty_bgs;
99         /* Protected by spin lock fs_info->unused_bgs_lock. */
100         struct list_head deleted_bgs;
101         spinlock_t dropped_roots_lock;
102         struct btrfs_delayed_ref_root delayed_refs;
103         struct btrfs_fs_info *fs_info;
104 };
105
106 #define __TRANS_FREEZABLE       (1U << 0)
107
108 #define __TRANS_START           (1U << 9)
109 #define __TRANS_ATTACH          (1U << 10)
110 #define __TRANS_JOIN            (1U << 11)
111 #define __TRANS_JOIN_NOLOCK     (1U << 12)
112 #define __TRANS_DUMMY           (1U << 13)
113
114 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
115 #define TRANS_ATTACH            (__TRANS_ATTACH)
116 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
117 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
118
119 #define TRANS_EXTWRITERS        (__TRANS_START | __TRANS_ATTACH)
120
121 #define BTRFS_SEND_TRANS_STUB   ((void *)1)
122
123 struct btrfs_trans_handle {
124         u64 transid;
125         u64 bytes_reserved;
126         u64 chunk_bytes_reserved;
127         unsigned long delayed_ref_updates;
128         struct btrfs_transaction *transaction;
129         struct btrfs_block_rsv *block_rsv;
130         struct btrfs_block_rsv *orig_rsv;
131         refcount_t use_count;
132         unsigned int type;
133         short aborted;
134         bool adding_csums;
135         bool allocating_chunk;
136         bool can_flush_pending_bgs;
137         bool reloc_reserved;
138         bool sync;
139         bool dirty;
140         struct btrfs_root *root;
141         struct btrfs_fs_info *fs_info;
142         struct list_head new_bgs;
143 };
144
145 struct btrfs_pending_snapshot {
146         struct dentry *dentry;
147         struct inode *dir;
148         struct btrfs_root *root;
149         struct btrfs_root_item *root_item;
150         struct btrfs_root *snap;
151         struct btrfs_qgroup_inherit *inherit;
152         struct btrfs_path *path;
153         /* block reservation for the operation */
154         struct btrfs_block_rsv block_rsv;
155         u64 qgroup_reserved;
156         /* extra metadata reservation for relocation */
157         int error;
158         bool readonly;
159         struct list_head list;
160 };
161
162 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
163                                               struct inode *inode)
164 {
165         spin_lock(&BTRFS_I(inode)->lock);
166         BTRFS_I(inode)->last_trans = trans->transaction->transid;
167         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
168         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
169         spin_unlock(&BTRFS_I(inode)->lock);
170 }
171
172 /*
173  * Make qgroup codes to skip given qgroupid, means the old/new_roots for
174  * qgroup won't contain the qgroupid in it.
175  */
176 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
177                                          u64 qgroupid)
178 {
179         struct btrfs_delayed_ref_root *delayed_refs;
180
181         delayed_refs = &trans->transaction->delayed_refs;
182         WARN_ON(delayed_refs->qgroup_to_skip);
183         delayed_refs->qgroup_to_skip = qgroupid;
184 }
185
186 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
187 {
188         struct btrfs_delayed_ref_root *delayed_refs;
189
190         delayed_refs = &trans->transaction->delayed_refs;
191         WARN_ON(!delayed_refs->qgroup_to_skip);
192         delayed_refs->qgroup_to_skip = 0;
193 }
194
195 int btrfs_end_transaction(struct btrfs_trans_handle *trans);
196 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
197                                                    unsigned int num_items);
198 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
199                                         struct btrfs_root *root,
200                                         unsigned int num_items,
201                                         int min_factor);
202 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
203 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
204 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
205 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
206                                         struct btrfs_root *root);
207 int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid);
208
209 void btrfs_add_dead_root(struct btrfs_root *root);
210 int btrfs_defrag_root(struct btrfs_root *root);
211 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
212 int btrfs_commit_transaction(struct btrfs_trans_handle *trans);
213 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
214                                    int wait_for_unblock);
215 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans);
216 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans);
217 void btrfs_throttle(struct btrfs_fs_info *fs_info);
218 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
219                                 struct btrfs_root *root);
220 int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
221                                 struct extent_io_tree *dirty_pages, int mark);
222 int btrfs_wait_extents(struct btrfs_fs_info *fs_info,
223                        struct extent_io_tree *dirty_pages);
224 int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark);
225 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
226 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
227 void btrfs_put_transaction(struct btrfs_transaction *transaction);
228 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
229 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
230                             struct btrfs_root *root);
231 #endif