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 #include "ctree.h"
  24
  25 enum btrfs_trans_state {
  26         TRANS_STATE_RUNNING             = 0,
  27         TRANS_STATE_BLOCKED             = 1,
  28         TRANS_STATE_COMMIT_START        = 2,
  29         TRANS_STATE_COMMIT_DOING        = 3,
  30         TRANS_STATE_UNBLOCKED           = 4,
  31         TRANS_STATE_COMPLETED           = 5,
  32         TRANS_STATE_MAX                 = 6,
  33 };
  34
  35 struct btrfs_transaction {
  36         u64 transid;
  37         /*
  38          * total external writers(USERSPACE/START/ATTACH) in this
  39          * transaction, it must be zero before the transaction is
  40          * being committed
  41          */
  42         atomic_t num_extwriters;
  43         /*
  44          * total writers in this transaction, it must be zero before the
  45          * transaction can end
  46          */
  47         atomic_t num_writers;
  48         atomic_t use_count;
  49
  50         /*
  51          * true if there is free bgs operations in this transaction
  52          */
  53         int have_free_bgs;
  54
  55         /* Be protected by fs_info->trans_lock when we want to change it. */
  56         enum btrfs_trans_state state;
  57         struct list_head list;
  58         struct extent_io_tree dirty_pages;
  59         unsigned long start_time;
  60         wait_queue_head_t writer_wait;
  61         wait_queue_head_t commit_wait;
  62         struct list_head pending_snapshots;
  63         struct list_head pending_chunks;
  64         struct list_head pending_ordered;
  65         struct list_head switch_commits;
  66         struct list_head dirty_bgs;
  67         struct list_head io_bgs;
  68         u64 num_dirty_bgs;
  69
  70         /*
  71          * we need to make sure block group deletion doesn't race with
  72          * free space cache writeout.  This mutex keeps them from stomping
  73          * on each other
  74          */
  75         struct mutex cache_write_mutex;
  76         spinlock_t dirty_bgs_lock;
  77         struct btrfs_delayed_ref_root delayed_refs;
  78         int aborted;
  79         int dirty_bg_run;
  80 };
  81
  82 #define __TRANS_FREEZABLE       (1U << 0)
  83
  84 #define __TRANS_USERSPACE       (1U << 8)
  85 #define __TRANS_START           (1U << 9)
  86 #define __TRANS_ATTACH          (1U << 10)
  87 #define __TRANS_JOIN            (1U << 11)
  88 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  89 #define __TRANS_DUMMY           (1U << 13)
  90
  91 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  92 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  93 #define TRANS_ATTACH            (__TRANS_ATTACH)
  94 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
  95 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
  96
  97 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
  98                                  __TRANS_ATTACH)
  99
 100 #define BTRFS_SEND_TRANS_STUB   ((void *)1)
 101
 102 struct btrfs_trans_handle {
 103         u64 transid;
 104         u64 bytes_reserved;
 105         u64 qgroup_reserved;
 106         unsigned long use_count;
 107         unsigned long blocks_reserved;
 108         unsigned long delayed_ref_updates;
 109         struct btrfs_transaction *transaction;
 110         struct btrfs_block_rsv *block_rsv;
 111         struct btrfs_block_rsv *orig_rsv;
 112         short aborted;
 113         short adding_csums;
 114         bool allocating_chunk;
 115         bool reloc_reserved;
 116         bool sync;
 117         bool dirty;
 118         unsigned int type;
 119         /*
 120          * this root is only needed to validate that the root passed to
 121          * start_transaction is the same as the one passed to end_transaction.
 122          * Subvolume quota depends on this
 123          */
 124         struct btrfs_root *root;
 125         struct seq_list delayed_ref_elem;
 126         struct list_head ordered;
 127         struct list_head qgroup_ref_list;
 128         struct list_head new_bgs;
 129 };
 130
 131 struct btrfs_pending_snapshot {
 132         struct dentry *dentry;
 133         struct inode *dir;
 134         struct btrfs_root *root;
 135         struct btrfs_root *snap;
 136         struct btrfs_qgroup_inherit *inherit;
 137         /* block reservation for the operation */
 138         struct btrfs_block_rsv block_rsv;
 139         u64 qgroup_reserved;
 140         /* extra metadata reseration for relocation */
 141         int error;
 142         bool readonly;
 143         struct list_head list;
 144 };
 145
 146 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 147                                               struct inode *inode)
 148 {
 149         spin_lock(&BTRFS_I(inode)->lock);
 150         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 151         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 152         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 153         spin_unlock(&BTRFS_I(inode)->lock);
 154 }
 155
 156 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 157                           struct btrfs_root *root);
 158 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 159                                                    int num_items);
 160 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 161                                         struct btrfs_root *root, int num_items);
 162 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 163 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 164 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 165 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 166                                         struct btrfs_root *root);
 167 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 168 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 169
 170 void btrfs_add_dead_root(struct btrfs_root *root);
 171 int btrfs_defrag_root(struct btrfs_root *root);
 172 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 173 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 174                              struct btrfs_root *root);
 175 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 176                                    struct btrfs_root *root,
 177                                    int wait_for_unblock);
 178 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 179                                    struct btrfs_root *root);
 180 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 181                                  struct btrfs_root *root);
 182 void btrfs_throttle(struct btrfs_root *root);
 183 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 184                                 struct btrfs_root *root);
 185 int btrfs_write_marked_extents(struct btrfs_root *root,
 186                                 struct extent_io_tree *dirty_pages, int mark);
 187 int btrfs_wait_marked_extents(struct btrfs_root *root,
 188                                 struct extent_io_tree *dirty_pages, int mark);
 189 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 190 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 191 void btrfs_put_transaction(struct btrfs_transaction *transaction);
 192 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
 193
 194 #endif