fs/romfs: return f_fsid for statfs(2)

Make romfs return f_fsid info for statfs(2).

Signed-off-by: Coly Li <coly.li@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 1e548a4975ba..10ca7d984a8b 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -408,12 +408,17 @@ static void romfs_destroy_inode(struct inode *inode)
  */
 static int romfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
+        struct super_block *sb = dentry->d_sb;
+        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
         buf->f_type = ROMFS_MAGIC;
         buf->f_namelen = ROMFS_MAXFN;
         buf->f_bsize = ROMBSIZE;
         buf->f_bfree = buf->f_bavail = buf->f_ffree;
         buf->f_blocks =
                 (romfs_maxsize(dentry->d_sb) + ROMBSIZE - 1) >> ROMBSBITS;
+        buf->f_fsid.val[0] = (u32)id;
+        buf->f_fsid.val[1] = (u32)(id >> 32);
         return 0;
 }