[PATCH v3 19/39] ubifs: fill ->s_dev in ubifs_fill_super

[Dongsheng Yang]

Some tools in userspace, such as quota-tools, are using
stat() to get the st_dev of a mount point then to find
out the device mounted on this mount point.

So we have to fill ->s_dev here to tell them which device
is mounted on this point.

Signed-off-by: Dongsheng Yang <yangds.fnst at cn.fujitsu.com>
Reviewed-by: Richard Weinberger <richard at nod.at>
---
 fs/ubifs/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 0e0428b..791bed47 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -36,6 +36,7 @@
 #include <linux/mount.h>
 #include <linux/math64.h>
 #include <linux/writeback.h>
+#include <linux/cdev.h>
 #include "ubifs.h"
 
 /*
@@ -2034,6 +2035,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
 
 	sb->s_bdi = &c->bdi;
 	sb->s_cdev = ubi_get_volume_cdev(c->ubi);
+	sb->s_dev = sb->s_cdev->dev;
 	sb->s_fs_info = c;
 	sb->s_magic = UBIFS_SUPER_MAGIC;
 	sb->s_blocksize = UBIFS_BLOCK_SIZE;
-- 
1.8.4.2