1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6 * Copyright (c) 2015 François Tigeot 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 #ifndef _LINUX_UACCESS_H_ 33 #define _LINUX_UACCESS_H_ 34 35 #include <linux/compiler.h> 36 37 #define __get_user(_x, _p) ({ \ 38 int __err; \ 39 __typeof(*(_p)) __x; \ 40 __err = -copyin((_p), &(__x), sizeof(*(_p))); \ 41 (_x) = __x; \ 42 __err; \ 43 }) 44 #define __put_user(_x, _p) ({ \ 45 __typeof(*(_p)) __x = (_x); \ 46 -copyout(&(__x), (_p), sizeof(*(_p))); \ 47 }) 48 #define get_user(_x, _p) -copyin((_p), &(_x), sizeof(*(_p))) 49 #define put_user(_x, _p) -copyout(&(_x), (_p), sizeof(*(_p))) 50 51 /* 52 * NOTE: The returned value from pagefault_disable() must be stored 53 * and passed to pagefault_enable(). Else possible recursion on the 54 * state can be lost. 55 */ 56 static inline int __must_check 57 pagefault_disable(void) 58 { 59 return (vm_fault_disable_pagefaults()); 60 } 61 62 static inline void 63 pagefault_enable(int save) 64 { 65 vm_fault_enable_pagefaults(save); 66 } 67 68 #endif /* _LINUX_UACCESS_H_ */ 69