vfs: new helper - vfs_ustat()
... and bury user_get_super()/statfs_by_dentry() - they are
purely internal now.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/statfs.c b/fs/statfs.c
index 9cf04a1..2aa6a22 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -7,6 +7,7 @@
#include <linux/statfs.h>
#include <linux/security.h>
#include <linux/uaccess.h>
+#include "internal.h"
static int flags_by_mnt(int mnt_flags)
{
@@ -45,7 +46,7 @@
flags_by_sb(mnt->mnt_sb->s_flags);
}
-int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
+static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
{
int retval;
@@ -205,19 +206,23 @@
return error;
}
-SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
+int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
{
- struct super_block *s;
- struct ustat tmp;
- struct kstatfs sbuf;
+ struct super_block *s = user_get_super(dev);
int err;
-
- s = user_get_super(new_decode_dev(dev));
if (!s)
return -EINVAL;
- err = statfs_by_dentry(s->s_root, &sbuf);
+ err = statfs_by_dentry(s->s_root, sbuf);
drop_super(s);
+ return err;
+}
+
+SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
+{
+ struct ustat tmp;
+ struct kstatfs sbuf;
+ int err = vfs_ustat(new_decode_dev(dev), &sbuf);
if (err)
return err;