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_H__
  20 #define __BTRFS_TRANSACTION_H__
  21
  22 struct btrfs_trans_handle {
  23         u64 transid;
  24         u64 alloc_exclude_start;
  25         u64 alloc_exclude_nr;
  26         unsigned long blocks_reserved;
  27         unsigned long blocks_used;
  28         struct btrfs_block_group_cache *block_group;
  29 };
  30
  31 static inline struct btrfs_trans_handle *
  32 btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
  33 {
  34         struct btrfs_fs_info *fs_info = root->fs_info;
  35         struct btrfs_trans_handle *h = malloc(sizeof(*h));
  36
  37         BUG_ON(!h);
  38         BUG_ON(root->commit_root);
  39         BUG_ON(fs_info->running_transaction);
  40         fs_info->running_transaction = h;
  41         fs_info->generation++;
  42         h->transid = fs_info->generation;
  43         h->alloc_exclude_start = 0;
  44         h->alloc_exclude_nr = 0;
  45         h->blocks_reserved = num_blocks;
  46         h->blocks_used = 0;
  47         h->block_group = NULL;
  48         root->last_trans = h->transid;
  49         root->commit_root = root->node;
  50         extent_buffer_get(root->node);
  51         return h;
  52 }
  53
  54 static inline void btrfs_free_transaction(struct btrfs_root *root,
  55                                           struct btrfs_trans_handle *handle)
  56 {
  57         memset(handle, 0, sizeof(*handle));
  58         free(handle);
  59 }
  60
  61 #endif