From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Sun, 11 Jul 2021 17:54:07 +0000 (-0400)
Subject: bcachefs: Mask out unknown compat features when going read-write
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2680325b7803c336bb675addfe38c06c44e54273;p=linux.git

bcachefs: Mask out unknown compat features when going read-write

Compat features should be cleared if the filesystem was touched by a
version that doesn't support them.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
---

diff --git a/fs/bcachefs/super-io.c b/fs/bcachefs/super-io.c
index 403e77e2c515d..be080c407286d 100644
--- a/fs/bcachefs/super-io.c
+++ b/fs/bcachefs/super-io.c
@@ -985,6 +985,7 @@ int bch2_fs_mark_dirty(struct bch_fs *c)
 	mutex_lock(&c->sb_lock);
 	SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
 	c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALWAYS);
+	c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
 	ret = bch2_write_super(c);
 	mutex_unlock(&c->sb_lock);