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/*
* 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.
*/
#include "kerncompat.h"
#include "transaction.h"
#include "messages.h"
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 = kzalloc(sizeof(*h), GFP_NOFS);
if (!h)
return ERR_PTR(-ENOMEM);
if (root->commit_root) {
error("commit_root aleady set when starting transaction");
kfree(h);
return ERR_PTR(-EINVAL);
}
if (fs_info->running_transaction) {
error("attempt to start transaction over already running one");
kfree(h);
return ERR_PTR(-EINVAL);
}
fs_info->running_transaction = h;
fs_info->generation++;
h->transid = fs_info->generation;
h->blocks_reserved = num_blocks;
root->last_trans = h->transid;
root->commit_root = root->node;
extent_buffer_get(root->node);
return h;
}
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