Btrfs: delay commits during fsync to allow more writers

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik
2007-08-10 16:22:09 -04:00
committed by David Woodhouse
parent f2183bde1a
commit 15ee9bc7ed
7 changed files with 66 additions and 16 deletions

View File

@ -694,22 +694,36 @@ static int btrfs_sync_file(struct file *file,
{
struct inode *inode = dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
int ret = 0;
struct btrfs_trans_handle *trans;
/*
* FIXME, use inode generation number to check if we can skip the
* commit
* check the transaction that last modified this inode
* and see if its already been committed
*/
mutex_lock(&root->fs_info->fs_mutex);
if (!BTRFS_I(inode)->last_trans)
goto out;
mutex_lock(&root->fs_info->trans_mutex);
if (BTRFS_I(inode)->last_trans <=
root->fs_info->last_trans_committed) {
BTRFS_I(inode)->last_trans = 0;
mutex_unlock(&root->fs_info->trans_mutex);
goto out;
}
mutex_unlock(&root->fs_info->trans_mutex);
/*
* ok we haven't committed the transaction yet, lets do a commit
*/
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
goto out;
}
ret = btrfs_commit_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
out:
mutex_unlock(&root->fs_info->fs_mutex);
return ret > 0 ? EIO : ret;
}