From: Liu Bo Date: Fri, 22 Feb 2013 04:33:36 +0000 (+0000) Subject: Btrfs: use reserved space for creating a snapshot X-Git-Tag: MMI-PSA29.97-13-9~14657^2~46 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2382c5cc7ed0396b61a359765bf5ee125b0a2f46;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git 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: Liu Bo Reviewed-by: Miao Xie Signed-off-by: Josef Bacik --- diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index a83d486cc70c..4330433b7b4f 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -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: