[PATCH 3/6] fat: Hook up sb->s_uuid

[Kent Overstreet <kent.overstreet@linux.dev>]

Now that we have a standard ioctl for querying the filesystem UUID,
initialize sb->s_uuid so that it works.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---
 fs/fat/inode.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 1fac3dabf130..a3d3478442d1 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1762,6 +1762,10 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 	else /* fat 16 or 12 */
 		sbi->vol_id = bpb.fat16_vol_id;
 
+	__le32 vol_id_le = cpu_to_le32(sbi->vol_id);
+	memcpy(&sb->s_uuid, &vol_id_le, sizeof(vol_id_le));
+	sb->s_uuid_len = sizeof(vol_id_le);
+
 	sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
 	sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
 
-- 
2.43.0