nilfs2: return f_fsid for statfs2

This follows the change of Coly Li's series ("fs: return f_fsid for
statfs(2)"), and make nilfs2 return f_fsid info for statfs(2).

Acked-by: Coly Li <coly.li@suse.de>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index e117e1ea9bff..8a965f9523aa 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -476,11 +476,12 @@ static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
         struct super_block *sb = dentry->d_sb;
         struct nilfs_sb_info *sbi = NILFS_SB(sb);
+        struct the_nilfs *nilfs = sbi->s_nilfs;
+        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
         unsigned long long blocks;
         unsigned long overhead;
         unsigned long nrsvblocks;
         sector_t nfreeblocks;
-        struct the_nilfs *nilfs = sbi->s_nilfs;
         int err;
 
         /*
@@ -514,6 +515,9 @@ static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_files = atomic_read(&sbi->s_inodes_count);
         buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
         buf->f_namelen = NILFS_NAME_LEN;
+        buf->f_fsid.val[0] = (u32)id;
+        buf->f_fsid.val[1] = (u32)(id >> 32);
+
         return 0;
 }