diff options
Diffstat (limited to 'transaction.c')
-rw-r--r-- | transaction.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/transaction.c b/transaction.c new file mode 100644 index 00000000..b9280015 --- /dev/null +++ b/transaction.c @@ -0,0 +1,49 @@ +/* + * 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; +} |