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 #include "kerncompat.h"
  23 #include "ctree.h"
  24
  25 struct btrfs_trans_handle {
  26         u64 transid;
  27         u64 alloc_exclude_start;
  28         u64 alloc_exclude_nr;
  29         unsigned long blocks_reserved;
  30         unsigned long blocks_used;
  31         struct btrfs_block_group_cache *block_group;
  32 };
  33
  34 static inline struct btrfs_trans_handle *
  35 btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
  36 {
  37         struct btrfs_fs_info *fs_info = root->fs_info;
  38         struct btrfs_trans_handle *h = malloc(sizeof(*h));
  39
  40         BUG_ON(!h);
  41         BUG_ON(root->commit_root);
  42         BUG_ON(fs_info->running_transaction);
  43         fs_info->running_transaction = h;
  44         fs_info->generation++;
  45         h->transid = fs_info->generation;
  46         h->alloc_exclude_start = 0;
  47         h->alloc_exclude_nr = 0;
  48         h->blocks_reserved = num_blocks;
  49         h->blocks_used = 0;
  50         h->block_group = NULL;
  51         root->last_trans = h->transid;
  52         root->commit_root = root->node;
  53         extent_buffer_get(root->node);
  54         return h;
  55 }
  56
  57 static inline void btrfs_free_transaction(struct btrfs_root *root,
  58                                           struct btrfs_trans_handle *handle)
  59 {
  60         memset(handle, 0, sizeof(*handle));
  61         free(handle);
  62 }
  63
  64 #endif