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         struct list_head list;
  62         struct extent_io_tree dirty_pages;
  63         unsigned long start_time;
  64         wait_queue_head_t writer_wait;
  65         wait_queue_head_t commit_wait;
  66         wait_queue_head_t pending_wait;
  67         struct list_head pending_snapshots;
  68         struct list_head pending_chunks;
  69         struct list_head switch_commits;
  70         struct list_head dirty_bgs;
  71         struct list_head io_bgs;
  72         struct list_head dropped_roots;
  73         u64 num_dirty_bgs;
  74
  75         /*
  76          * we need to make sure block group deletion doesn't race with
  77          * free space cache writeout.  This mutex keeps them from stomping
  78          * on each other
  79          */
  80         struct mutex cache_write_mutex;
  81         spinlock_t dirty_bgs_lock;
  82         /* Protected by spin lock fs_info->unused_bgs_lock. */
  83         struct list_head deleted_bgs;
  84         spinlock_t dropped_roots_lock;
  85         struct btrfs_delayed_ref_root delayed_refs;
  86         int aborted;
  87         struct btrfs_fs_info *fs_info;
  88 };
  89
  90 #define __TRANS_FREEZABLE       (1U << 0)
  91
  92 #define __TRANS_USERSPACE       (1U << 8)
  93 #define __TRANS_START           (1U << 9)
  94 #define __TRANS_ATTACH          (1U << 10)
  95 #define __TRANS_JOIN            (1U << 11)
  96 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  97 #define __TRANS_DUMMY           (1U << 13)
  98
  99 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
 100 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
 101 #define TRANS_ATTACH            (__TRANS_ATTACH)
 102 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
 103 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
 104
 105 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
 106                                  __TRANS_ATTACH)
 107
 108 #define BTRFS_SEND_TRANS_STUB   ((void *)1)
 109
 110 struct btrfs_trans_handle {
 111         u64 transid;
 112         u64 bytes_reserved;
 113         u64 chunk_bytes_reserved;
 114         unsigned long use_count;
 115         unsigned long blocks_reserved;
 116         unsigned long delayed_ref_updates;
 117         struct btrfs_transaction *transaction;
 118         struct btrfs_block_rsv *block_rsv;
 119         struct btrfs_block_rsv *orig_rsv;
 120         short aborted;
 121         short adding_csums;
 122         bool allocating_chunk;
 123         bool can_flush_pending_bgs;
 124         bool reloc_reserved;
 125         bool sync;
 126         bool dirty;
 127         unsigned int type;
 128         struct btrfs_root *root;
 129         struct btrfs_fs_info *fs_info;
 130         struct list_head new_bgs;
 131 };
 132
 133 struct btrfs_pending_snapshot {
 134         struct dentry *dentry;
 135         struct inode *dir;
 136         struct btrfs_root *root;
 137         struct btrfs_root_item *root_item;
 138         struct btrfs_root *snap;
 139         struct btrfs_qgroup_inherit *inherit;
 140         struct btrfs_path *path;
 141         /* block reservation for the operation */
 142         struct btrfs_block_rsv block_rsv;
 143         u64 qgroup_reserved;
 144         /* extra metadata reservation for relocation */
 145         int error;
 146         bool readonly;
 147         struct list_head list;
 148 };
 149
 150 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 151                                               struct inode *inode)
 152 {
 153         spin_lock(&BTRFS_I(inode)->lock);
 154         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 155         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 156         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 157         spin_unlock(&BTRFS_I(inode)->lock);
 158 }
 159
 160 /*
 161  * Make qgroup codes to skip given qgroupid, means the old/new_roots for
 162  * qgroup won't contain the qgroupid in it.
 163  */
 164 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
 165                                          u64 qgroupid)
 166 {
 167         struct btrfs_delayed_ref_root *delayed_refs;
 168
 169         delayed_refs = &trans->transaction->delayed_refs;
 170         WARN_ON(delayed_refs->qgroup_to_skip);
 171         delayed_refs->qgroup_to_skip = qgroupid;
 172 }
 173
 174 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
 175 {
 176         struct btrfs_delayed_ref_root *delayed_refs;
 177
 178         delayed_refs = &trans->transaction->delayed_refs;
 179         WARN_ON(!delayed_refs->qgroup_to_skip);
 180         delayed_refs->qgroup_to_skip = 0;
 181 }
 182
 183 int btrfs_end_transaction(struct btrfs_trans_handle *trans);
 184 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 185                                                    unsigned int num_items);
 186 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
 187                                         struct btrfs_root *root,
 188                                         unsigned int num_items,
 189                                         int min_factor);
 190 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 191                                         struct btrfs_root *root,
 192                                         unsigned int num_items);
 193 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 194 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 195 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 196 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 197                                         struct btrfs_root *root);
 198 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 199 int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid);
 200
 201 void btrfs_add_dead_root(struct btrfs_root *root);
 202 int btrfs_defrag_root(struct btrfs_root *root);
 203 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 204 int btrfs_commit_transaction(struct btrfs_trans_handle *trans);
 205 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 206                                    int wait_for_unblock);
 207 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans);
 208 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans);
 209 void btrfs_throttle(struct btrfs_fs_info *fs_info);
 210 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 211                                 struct btrfs_root *root);
 212 int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
 213                                 struct extent_io_tree *dirty_pages, int mark);
 214 int btrfs_wait_extents(struct btrfs_fs_info *fs_info,
 215                        struct extent_io_tree *dirty_pages);
 216 int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark);
 217 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 218 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 219 void btrfs_put_transaction(struct btrfs_transaction *transaction);
 220 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
 221 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
 222                             struct btrfs_root *root);
 223 #endif