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
  23 struct btrfs_transaction {
  24         u64 transid;
  25         unsigned long num_writers;
  26         unsigned long num_joined;
  27         int in_commit;
  28         int use_count;
  29         int commit_done;
  30         struct list_head list;
  31         struct extent_io_tree dirty_pages;
  32         unsigned long start_time;
  33         wait_queue_head_t writer_wait;
  34         wait_queue_head_t commit_wait;
  35         struct list_head pending_snapshots;
  36 };
  37
  38 struct btrfs_trans_handle {
  39         u64 transid;
  40         unsigned long blocks_reserved;
  41         unsigned long blocks_used;
  42         struct btrfs_transaction *transaction;
  43         struct btrfs_block_group_cache *block_group;
  44         u64 alloc_exclude_start;
  45         u64 alloc_exclude_nr;
  46 };
  47
  48 struct btrfs_pending_snapshot {
  49         struct btrfs_root *root;
  50         char *name;
  51         struct list_head list;
  52 };
  53
  54
  55 static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
  56                                                struct inode *inode)
  57 {
  58         trans->block_group = BTRFS_I(inode)->block_group;
  59 }
  60
  61 static inline void btrfs_update_inode_block_group(struct
  62                                                   btrfs_trans_handle *trans,
  63                                                   struct inode *inode)
  64 {
  65         BTRFS_I(inode)->block_group = trans->block_group;
  66 }
  67
  68 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  69                                               struct inode *inode)
  70 {
  71         BTRFS_I(inode)->last_trans = trans->transaction->transid;
  72 }
  73
  74 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
  75                           struct btrfs_root *root);
  76 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
  77                                                    int num_blocks);
  78 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
  79                                      struct btrfs_root *root);
  80 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
  81                             struct btrfs_root *root);
  82
  83 int btrfs_add_dead_root(struct btrfs_root *root, struct btrfs_root *latest,
  84                         struct list_head *dead_list);
  85 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
  86 int btrfs_clean_old_snapshots(struct btrfs_root *root);
  87 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
  88                              struct btrfs_root *root);
  89 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
  90                                    struct btrfs_root *root);
  91 #endif