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transaction.h

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __TRANSACTION__
#define __TRANSACTION__

00022 struct btrfs_trans_handle {
      u64 transid;
      u64 alloc_exclude_start;
      u64 alloc_exclude_nr;
      unsigned long blocks_reserved;
      unsigned long blocks_used;
      struct btrfs_block_group_cache *block_group;
};

static inline struct btrfs_trans_handle *
btrfs_start_transaction(struct btrfs_root *root, int num_blocks)
{
      struct btrfs_fs_info *fs_info = root->fs_info;
      struct btrfs_trans_handle *h = malloc(sizeof(*h));

      BUG_ON(root->commit_root);
      BUG_ON(fs_info->running_transaction);
      fs_info->running_transaction = h;
      fs_info->generation++;
      h->transid = fs_info->generation;
      h->alloc_exclude_start = 0;
      h->alloc_exclude_nr = 0;
      h->blocks_reserved = num_blocks;
      h->blocks_used = 0;
      h->block_group = NULL;
      root->last_trans = h->transid;
      root->commit_root = root->node;
      extent_buffer_get(root->node);
      return h;
}

static inline void btrfs_free_transaction(struct btrfs_root *root,
                                struct btrfs_trans_handle *handle)
{
      memset(handle, 0, sizeof(*handle));
      free(handle);
}

#endif

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