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[RFC,2/4] btrfs: don't BUG_ON() in btrfs_link_subvol()

Message ID 20180805104001.5488-3-lufq.fnst@cn.fujitsu.com (mailing list archive)
State New, archived
Headers show
Series undelete subvolume online version | expand

Commit Message

Lu Fengqi Aug. 5, 2018, 10:39 a.m. UTC 
Both of btrfs_update_inode() and btrfs_add_root_ref() may fail because
of ENOMEM. So there's no reason to panic here, we can replace BUG_ON()
with btrfs_abort_transaction() here.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
---
 fs/btrfs/ioctl.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
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Patch

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d37c26f69112..e0b5a8fb15e7 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -572,11 +572,17 @@  static int btrfs_link_subvol(struct btrfs_trans_handle *trans,
 
 	btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
 	ret = btrfs_update_inode(trans, root, dir);
-	BUG_ON(ret);
+	if (ret) {
+		btrfs_abort_transaction(trans, ret);
+		return ret;
+	}
 
 	ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
 				 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
-	BUG_ON(ret);
+	if (ret) {
+		btrfs_abort_transaction(trans, ret);
+		return ret;
+	}
 
 	return ret;
 }