Commit 2382c5cc authored by Liu Bo's avatar Liu Bo Committed by Josef Bacik

Btrfs: use reserved space for creating a snapshot

While inserting dir index and updating inode for a snapshot, we'd
add delayed items which consume trans->block_rsv, if we don't have
any space reserved in this trans handle, we either just return or
reserve space again.

But before creating pending snapshots during committing transaction,
we've done a release on this trans handle, so we don't have space reserved
in it at this stage.

What we're using is block_rsv of pending snapshots which has already
reserved well enough space for both inserting dir index and updating
inode, so we need to set trans handle to indicate that we have space
now.
Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
parent a81cb9a2
......@@ -1123,6 +1123,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
rsv = trans->block_rsv;
trans->block_rsv = &pending->block_rsv;
trans->bytes_reserved = trans->block_rsv->reserved;
dentry = pending->dentry;
parent = dget_parent(dentry);
......@@ -1276,6 +1277,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
fail:
dput(parent);
trans->block_rsv = rsv;
trans->bytes_reserved = 0;
no_free_objectid:
kfree(new_root_item);
root_item_alloc_fail:
......
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