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         spinlock_t dirty_bgs_lock;
  68         struct btrfs_delayed_ref_root delayed_refs;
  69         int aborted;
  70 };
  71
  72 #define __TRANS_FREEZABLE       (1U << 0)
  73
  74 #define __TRANS_USERSPACE       (1U << 8)
  75 #define __TRANS_START           (1U << 9)
  76 #define __TRANS_ATTACH          (1U << 10)
  77 #define __TRANS_JOIN            (1U << 11)
  78 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  79 #define __TRANS_DUMMY           (1U << 13)
  80
  81 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  82 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  83 #define TRANS_ATTACH            (__TRANS_ATTACH)
  84 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
  85 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
  86
  87 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
  88                                  __TRANS_ATTACH)
  89
  90 #define BTRFS_SEND_TRANS_STUB   ((void *)1)
  91
  92 struct btrfs_trans_handle {
  93         u64 transid;
  94         u64 bytes_reserved;
  95         u64 qgroup_reserved;
  96         unsigned long use_count;
  97         unsigned long blocks_reserved;
  98         unsigned long blocks_used;
  99         unsigned long delayed_ref_updates;
 100         struct btrfs_transaction *transaction;
 101         struct btrfs_block_rsv *block_rsv;
 102         struct btrfs_block_rsv *orig_rsv;
 103         short aborted;
 104         short adding_csums;
 105         bool allocating_chunk;
 106         bool reloc_reserved;
 107         bool sync;
 108         unsigned int type;
 109         /*
 110          * this root is only needed to validate that the root passed to
 111          * start_transaction is the same as the one passed to end_transaction.
 112          * Subvolume quota depends on this
 113          */
 114         struct btrfs_root *root;
 115         struct seq_list delayed_ref_elem;
 116         struct list_head ordered;
 117         struct list_head qgroup_ref_list;
 118         struct list_head new_bgs;
 119 };
 120
 121 struct btrfs_pending_snapshot {
 122         struct dentry *dentry;
 123         struct inode *dir;
 124         struct btrfs_root *root;
 125         struct btrfs_root *snap;
 126         struct btrfs_qgroup_inherit *inherit;
 127         /* block reservation for the operation */
 128         struct btrfs_block_rsv block_rsv;
 129         u64 qgroup_reserved;
 130         /* extra metadata reseration for relocation */
 131         int error;
 132         bool readonly;
 133         struct list_head list;
 134 };
 135
 136 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 137                                               struct inode *inode)
 138 {
 139         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 140         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 141         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 142 }
 143
 144 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 145                           struct btrfs_root *root);
 146 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 147                                                    int num_items);
 148 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 149                                         struct btrfs_root *root, int num_items);
 150 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 151 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 152 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 153 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 154                                         struct btrfs_root *root);
 155 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 156 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 157
 158 void btrfs_add_dead_root(struct btrfs_root *root);
 159 int btrfs_defrag_root(struct btrfs_root *root);
 160 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 161 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 162                              struct btrfs_root *root);
 163 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 164                                    struct btrfs_root *root,
 165                                    int wait_for_unblock);
 166 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 167                                    struct btrfs_root *root);
 168 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 169                                  struct btrfs_root *root);
 170 void btrfs_throttle(struct btrfs_root *root);
 171 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 172                                 struct btrfs_root *root);
 173 int btrfs_write_marked_extents(struct btrfs_root *root,
 174                                 struct extent_io_tree *dirty_pages, int mark);
 175 int btrfs_wait_marked_extents(struct btrfs_root *root,
 176                                 struct extent_io_tree *dirty_pages, int mark);
 177 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 178 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 179 void btrfs_put_transaction(struct btrfs_transaction *transaction);
 180 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
 181
 182 #endif