fs/fat: return f_fsid for statfs(2)

Make fat return f_fsid info for statfs(2).

Signed-off-by: Coly Li <coly.li@suse.de>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index de0004fe6e0049c8a09a494444d19831313da64c..2cc952e4c3dc37279a8fde4f1279408c4151d474 100644 (file)
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -523,7 +523,9 @@ static int fat_remount(struct super_block *sb, int *flags, char *data)
 
 static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
-       struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
+       struct super_block *sb = dentry->d_sb;
+       struct msdos_sb_info *sbi = MSDOS_SB(sb);
+       u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 
        /* If the count of free cluster is still unknown, counts it here. */
        if (sbi->free_clusters == -1 || !sbi->free_clus_valid) {
@@ -537,6 +539,8 @@ static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
        buf->f_blocks = sbi->max_cluster - FAT_START_ENT;
        buf->f_bfree = sbi->free_clusters;
        buf->f_bavail = sbi->free_clusters;
+       buf->f_fsid.val[0] = (u32)id;
+       buf->f_fsid.val[1] = (u32)(id >> 32);
        buf->f_namelen = sbi->options.isvfat ? 260 : 12;
 
        return 0;