From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Sat, 29 Mar 2025 21:59:50 +0000 (-0400)
Subject: bcachefs: Clear fs_path_parent on subvolume unlink
X-Git-Tag: v6.15-rc1~83^2~8
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b3981564ca8fa341a57c16dcbed1a9bd7f4e3be1;p=thirdparty%2Flinux.git

bcachefs: Clear fs_path_parent on subvolume unlink

This fixes recursive subvolume removal.

Subvolume deletion is asynchronous; fs_path_parent, and thus the entry
in the subvolume_children btree, need to be cleared when the subvolume
is unlinked from the fs heirarchy - else we'll spuriously think a
subvolume has children and deletion will fail.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/fs/bcachefs/subvolume.c b/fs/bcachefs/subvolume.c
index b7b96283c3161..cd0d8e5e44e79 100644
--- a/fs/bcachefs/subvolume.c
+++ b/fs/bcachefs/subvolume.c
@@ -561,6 +561,7 @@ int bch2_subvolume_unlink(struct btree_trans *trans, u32 subvolid)
 	}
 
 	SET_BCH_SUBVOLUME_UNLINKED(&n->v, true);
+	n->v.fs_path_parent = 0;
 	bch2_trans_iter_exit(trans, &iter);
 	return ret;
 }