[PATCH 5.17 042/772] btrfs: add "0x" prefix for unsupported optional features

Greg Kroah-Hartman
2022-06-07T20:21:31Z

From: Qu Wenruo <wqu@suse.com>

commit d5321a0fa8bc49f11bea0b470800962c17d92d8f upstream.

The following error message lack the "0x" obviously:

cannot mount because of unsupported optional features (4000)

Add the prefix to make it less confusing. This can happen on older
kernels that try to mount a filesystem with newer features so it makes
sense to backport to older trees.

CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/disk-io.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3522,7 +3522,7 @@ int __cold open_ctree(struct super_block
~BTRFS_FEATURE_INCOMPAT_SUPP;
if (features) {
btrfs_err(fs_info,
- "cannot mount because of unsupported optional features (%llx)",
+ "cannot mount because of unsupported optional features (0x%llx)",
features);
err = -EINVAL;
goto fail_alloc;
@@ -3560,7 +3560,7 @@ int __cold open_ctree(struct super_block
~BTRFS_FEATURE_COMPAT_RO_SUPP;
if (!sb_rdonly(sb) && features) {
btrfs_err(fs_info,
- "cannot mount read-write because of unsupported optional features (%llx)",
+ "cannot mount read-write because of unsupported optional features (0x%llx)",
features);
err = -EINVAL;
goto fail_alloc;