From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Wed, 12 Oct 2022 20:12:27 +0000 (-0400)
Subject: bcachefs: Don't allow hardlinks when inherited attrs would change
X-Git-Tag: io_uring-6.7-2023-11-10~119^2~724
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=bf9cb250edf776454d0600b4341c6667974bedb8;p=linux-block.git

bcachefs: Don't allow hardlinks when inherited attrs would change

This is the right thing to do, and conforms with our own behaviour on
rename and xfs's behaviour on hardlink.

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

diff --git a/fs/bcachefs/fs-common.c b/fs/bcachefs/fs-common.c
index 53ffc684223c..e9dd1d13ec7e 100644
--- a/fs/bcachefs/fs-common.c
+++ b/fs/bcachefs/fs-common.c
@@ -212,6 +212,11 @@ int bch2_link_trans(struct btree_trans *trans,
 	if (ret)
 		goto err;
 
+	if (bch2_reinherit_attrs(inode_u, dir_u)) {
+		ret = -EXDEV;
+		goto err;
+	}
+
 	dir_u->bi_mtime = dir_u->bi_ctime = now;
 
 	dir_hash = bch2_hash_info_init(c, dir_u);