btrfs: use GFP_KERNEL in create_snapshot

We don't need to use GFP_NOFS here as this is called from ioctls an the
only lock held is the subvol_sem, which is of a high level and protects
creation/renames/deletion and is never held in the writeout paths.
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

@@ -670,12 +670,12 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
 	if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
 		return -EINVAL;
 
-	pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
+	pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
 	if (!pending_snapshot)
 		return -ENOMEM;
 
 	pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
-			GFP_NOFS);
+			GFP_KERNEL);
 	pending_snapshot->path = btrfs_alloc_path();
 	if (!pending_snapshot->root_item || !pending_snapshot->path) {
 		ret = -ENOMEM;