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Btrfs: don't start a new transaction when starting sync 

If there is no running transaction in the fs, we needn't start a new one when
we want to start sync.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Miao Xie 2012-11-26 08:41:29 +00:00 committed by Chris Mason
parent 9a8c28bec1
commit ff7c1d3355
2 changed files with 18 additions and 9 deletions
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14
fs/btrfs/ioctl.c
View File

@ -3065,16 +3065,22 @@ static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
u64 transid;
int ret;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
trans = btrfs_attach_transaction(root);
if (IS_ERR(trans)) {
if (PTR_ERR(trans) != -ENOENT)
return PTR_ERR(trans);
/* No running transaction, don't bother */
transid = root->fs_info->last_trans_committed;
goto out;
}
transid = trans->transid;
ret = btrfs_commit_transaction_async(trans, root, 0);
if (ret) {
btrfs_end_transaction(trans, root);
return ret;
}
out:
if (argp)
if (copy_to_user(argp, &transid, sizeof(transid)))
return -EFAULT;

13
fs/btrfs/transaction.c
View File

@ -1307,9 +1307,10 @@ static void do_async_commit(struct work_struct *work)
* We've got freeze protection passed with the transaction.
* Tell lockdep about it.
*/
rwsem_acquire_read(
&ac->root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
0, 1, _THIS_IP_);
if (ac->newtrans->type < TRANS_JOIN_NOLOCK)
rwsem_acquire_read(
&ac->root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
0, 1, _THIS_IP_);
current->journal_info = ac->newtrans;
@ -1347,8 +1348,10 @@ int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
* Tell lockdep we've released the freeze rwsem, since the
* async commit thread will be the one to unlock it.
*/
rwsem_release(&root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
1, _THIS_IP_);
if (trans->type < TRANS_JOIN_NOLOCK)
rwsem_release(
&root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
1, _THIS_IP_);
schedule_delayed_work(&ac->work, 0);