orangefs: simplify compat ioctl handling

no need to mess with copy_in_user(), etc...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/orangefs/devorangefs-req.c b/fs/orangefs/devorangefs-req.c
index 66369ec900201e3f4fd458e965f4719cbd747a09..8581daf1963493b078feb2392ec2cef692d03223 100644 (file)
--- a/fs/orangefs/devorangefs-req.c
+++ b/fs/orangefs/devorangefs-req.c
@@ -716,37 +716,6 @@ struct ORANGEFS_dev_map_desc32 {
        __s32 count;
 };
 
-static unsigned long translate_dev_map26(unsigned long args, long *error)
-{
-       struct ORANGEFS_dev_map_desc32 __user *p32 = (void __user *)args;
-       /*
-        * Depending on the architecture, allocate some space on the
-        * user-call-stack based on our expected layout.
-        */
-       struct ORANGEFS_dev_map_desc __user *p =
-           compat_alloc_user_space(sizeof(*p));
-       compat_uptr_t addr;
-
-       *error = 0;
-       /* get the ptr from the 32 bit user-space */
-       if (get_user(addr, &p32->ptr))
-               goto err;
-       /* try to put that into a 64-bit layout */
-       if (put_user(compat_ptr(addr), &p->ptr))
-               goto err;
-       /* copy the remaining fields */
-       if (copy_in_user(&p->total_size, &p32->total_size, sizeof(__s32)))
-               goto err;
-       if (copy_in_user(&p->size, &p32->size, sizeof(__s32)))
-               goto err;
-       if (copy_in_user(&p->count, &p32->count, sizeof(__s32)))
-               goto err;
-       return (unsigned long)p;
-err:
-       *error = -EFAULT;
-       return 0;
-}
-
 /*
  * 32 bit user-space apps' ioctl handlers when kernel modules
  * is compiled as a 64 bit one
@@ -755,25 +724,26 @@ static long orangefs_devreq_compat_ioctl(struct file *filp, unsigned int cmd,
                                      unsigned long args)
 {
        long ret;
-       unsigned long arg = args;
 
        /* Check for properly constructed commands */
        ret = check_ioctl_command(cmd);
        if (ret < 0)
                return ret;
        if (cmd == ORANGEFS_DEV_MAP) {
-               /*
-                * convert the arguments to what we expect internally
-                * in kernel space
-                */
-               arg = translate_dev_map26(args, &ret);
-               if (ret < 0) {
-                       gossip_err("Could not translate dev map\n");
-                       return ret;
-               }
+               struct ORANGEFS_dev_map_desc desc;
+               struct ORANGEFS_dev_map_desc32 d32;
+
+               if (copy_from_user(&d32, (void __user *)args, sizeof(d32)))
+                       return -EFAULT;
+
+               desc.ptr = compat_ptr(d32.ptr);
+               desc.total_size = d32.total_size;
+               desc.size = d32.size;
+               desc.count = d32.count;
+               return orangefs_bufmap_initialize(&desc);
        }
        /* no other ioctl requires translation */
-       return dispatch_ioctl_command(cmd, arg);
+       return dispatch_ioctl_command(cmd, args);
 }
 
 #endif /* CONFIG_COMPAT is in .config */