1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001 Cluster File Systems, Inc. <braam@clusterfs.com>
6 * This file is part of InterMezzo, http://www.inter-mezzo.org.
8 * InterMezzo is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * InterMezzo is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with InterMezzo; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * Data structures unpacking/packing macros & inlines
25 #ifndef _INTERMEZZO_LIB_H
26 #define _INTERMEZZO_LIB_H
29 # include <linux/types.h>
32 # include <sys/types.h>
35 static inline int size_round (int val)
37 return (val + 3) & (~0x3);
40 static inline int size_round0(int val)
44 return (val + 1 + 3) & (~0x3);
47 static inline size_t round_strlen(char *fset)
49 return size_round(strlen(fset) + 1);
53 # define NTOH__u32(var) le32_to_cpu(var)
54 # define NTOH__u64(var) le64_to_cpu(var)
55 # define HTON__u32(var) cpu_to_le32(var)
56 # define HTON__u64(var) cpu_to_le64(var)
59 # define NTOH__u32(var) GUINT32_FROM_LE(var)
60 # define NTOH__u64(var) GUINT64_FROM_LE(var)
61 # define HTON__u32(var) GUINT32_TO_LE(var)
62 # define HTON__u64(var) GUINT64_TO_LE(var)
66 * copy sizeof(type) bytes from pointer to var and move ptr forward.
67 * return EFAULT if pointer goes beyond end
69 #define UNLOGV(var,type,ptr,end) \
72 ptr += sizeof(type); \
77 /* the following two macros convert to little endian */
78 /* type MUST be __u32 or __u64 */
79 #define LUNLOGV(var,type,ptr,end) \
81 var = NTOH##type(*(type *)ptr); \
82 ptr += sizeof(type); \
88 #define LOGV(var,type,ptr) \
90 *((type *)ptr) = var; \
91 ptr += sizeof(type); \
94 /* and in network order */
95 #define LLOGV(var,type,ptr) \
97 *((type *)ptr) = HTON##type(var); \
98 ptr += sizeof(type); \
103 * set var to point at (type *)ptr, move ptr forward with sizeof(type)
104 * return from function with EFAULT if ptr goes beyond end
106 #define UNLOGP(var,type,ptr,end) \
109 ptr += sizeof(type); \
114 #define LOGP(var,type,ptr) \
116 memcpy(ptr, var, sizeof(type)); \
117 ptr += sizeof(type); \
121 * set var to point at (char *)ptr, move ptr forward by size_round(len);
122 * return from function with EFAULT if ptr goes beyond end
124 #define UNLOGL(var,type,len,ptr,end) \
130 ptr += size_round(len * sizeof(type)); \
136 #define UNLOGL0(var,type,len,ptr,end) \
138 UNLOGL(var,type,len+1,ptr,end); \
139 if ( *((char *)ptr - size_round(len+1) + len) != '\0') \
143 #define LOGL(var,len,ptr) \
145 size_t __fill = size_round(len); \
146 /* Prevent data leakage. */ \
148 memset((char *)ptr, 0, __fill); \
149 memcpy((char *)ptr, (const char *)var, len); \
153 #define LOGL0(var,len,ptr) \
156 memcpy((char *)ptr, (const char *)var, len); \
157 *((char *)(ptr) + len) = 0; \
158 ptr += size_round(len + 1); \
161 #endif /* _INTERMEZZO_LIB_H */