[PATCH AUTOSEL for 4.14 054/161] btrfs: fail mount when sb flag is not in BTRFS_SUPER_FLAG_SUPP

Sasha Levin
2018-04-09T03:18:47Z

From: Anand Jain <Anand.Jain@oracle.com>

[ Upstream commit 6f794e3c5c8f8fdd3b5bb20d9ded894e685b5bbe ]

It appears from the original commit [1] that there isn't any design
specific reason not to fail the mount instead of just warning. This
patch will change it to fail.

[1]
commit 319e4d0661e5323c9f9945f0f8fb5905e5fe74c3
btrfs: Enhance super validation check

Fixes: 319e4d0661e5323 ("btrfs: Enhance super validation check")
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
fs/btrfs/disk-io.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 167ce43cabe8..79f0f282a0ef 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4063,9 +4063,11 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info)
btrfs_err(fs_info, "no valid FS found");
ret = -EINVAL;
}
- if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP)
- btrfs_warn(fs_info, "unrecognized super flag: %llu",
+ if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
+ btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
+ ret = -EINVAL;
+ }
if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
btrfs_err(fs_info, "tree_root level too big: %d >= %d",
btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
--
2.15.1