1 files changed, 28 insertions, 0 deletions

diff --git a/fs/compat.c b/fs/compat.c
index 0949b43794a4..5e374aad33f7 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -378,6 +378,34 @@ out:
         return error;
 }
 
+/*
+ * This is a copy of sys_ustat, just dealing with a structure layout.
+ * Given how simple this syscall is that apporach is more maintainable
+ * than the various conversion hacks.
+ */
+asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
+{
+        struct super_block *sb;
+        struct compat_ustat tmp;
+        struct kstatfs sbuf;
+        int err;
+
+        sb = user_get_super(new_decode_dev(dev));
+        if (!sb)
+                return -EINVAL;
+        err = vfs_statfs(sb->s_root, &sbuf);
+        drop_super(sb);
+        if (err)
+                return err;
+
+        memset(&tmp, 0, sizeof(struct compat_ustat));
+        tmp.f_tfree = sbuf.f_bfree;
+        tmp.f_tinode = sbuf.f_ffree;
+        if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
+                return -EFAULT;
+        return 0;
+}
+
 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
 {
         if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||