[PATCH 6/20] fs/fat: return f_fsid for statfs(2)

[Coly Li]

This patch makes fat return f_fsid info for statfs(2).

Signed-off-by: Coly Li <coly.li@xxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
---
 fs/fat/inode.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 6b74d09..c093b7f 100644
--- 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;
-- 
Coly Li
SuSE Labs



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