Merge git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
[sfrench/cifs-2.6.git] / include / linux / ceph / decode.h
1 #ifndef __CEPH_DECODE_H
2 #define __CEPH_DECODE_H
3
4 #include <linux/bug.h>
5 #include <linux/time.h>
6 #include <asm/unaligned.h>
7
8 #include "types.h"
9
10 /*
11  * in all cases,
12  *   void **p     pointer to position pointer
13  *   void *end    pointer to end of buffer (last byte + 1)
14  */
15
16 static inline u64 ceph_decode_64(void **p)
17 {
18         u64 v = get_unaligned_le64(*p);
19         *p += sizeof(u64);
20         return v;
21 }
22 static inline u32 ceph_decode_32(void **p)
23 {
24         u32 v = get_unaligned_le32(*p);
25         *p += sizeof(u32);
26         return v;
27 }
28 static inline u16 ceph_decode_16(void **p)
29 {
30         u16 v = get_unaligned_le16(*p);
31         *p += sizeof(u16);
32         return v;
33 }
34 static inline u8 ceph_decode_8(void **p)
35 {
36         u8 v = *(u8 *)*p;
37         (*p)++;
38         return v;
39 }
40 static inline void ceph_decode_copy(void **p, void *pv, size_t n)
41 {
42         memcpy(pv, *p, n);
43         *p += n;
44 }
45
46 /*
47  * bounds check input.
48  */
49 static inline int ceph_has_room(void **p, void *end, size_t n)
50 {
51         return end >= *p && n <= end - *p;
52 }
53
54 #define ceph_decode_need(p, end, n, bad)                \
55         do {                                            \
56                 if (!likely(ceph_has_room(p, end, n)))  \
57                         goto bad;                       \
58         } while (0)
59
60 #define ceph_decode_64_safe(p, end, v, bad)                     \
61         do {                                                    \
62                 ceph_decode_need(p, end, sizeof(u64), bad);     \
63                 v = ceph_decode_64(p);                          \
64         } while (0)
65 #define ceph_decode_32_safe(p, end, v, bad)                     \
66         do {                                                    \
67                 ceph_decode_need(p, end, sizeof(u32), bad);     \
68                 v = ceph_decode_32(p);                          \
69         } while (0)
70 #define ceph_decode_16_safe(p, end, v, bad)                     \
71         do {                                                    \
72                 ceph_decode_need(p, end, sizeof(u16), bad);     \
73                 v = ceph_decode_16(p);                          \
74         } while (0)
75 #define ceph_decode_8_safe(p, end, v, bad)                      \
76         do {                                                    \
77                 ceph_decode_need(p, end, sizeof(u8), bad);      \
78                 v = ceph_decode_8(p);                           \
79         } while (0)
80
81 #define ceph_decode_copy_safe(p, end, pv, n, bad)               \
82         do {                                                    \
83                 ceph_decode_need(p, end, n, bad);               \
84                 ceph_decode_copy(p, pv, n);                     \
85         } while (0)
86
87 /*
88  * struct ceph_timespec <-> struct timespec
89  */
90 static inline void ceph_decode_timespec(struct timespec *ts,
91                                         const struct ceph_timespec *tv)
92 {
93         ts->tv_sec = le32_to_cpu(tv->tv_sec);
94         ts->tv_nsec = le32_to_cpu(tv->tv_nsec);
95 }
96 static inline void ceph_encode_timespec(struct ceph_timespec *tv,
97                                         const struct timespec *ts)
98 {
99         tv->tv_sec = cpu_to_le32(ts->tv_sec);
100         tv->tv_nsec = cpu_to_le32(ts->tv_nsec);
101 }
102
103 /*
104  * sockaddr_storage <-> ceph_sockaddr
105  */
106 static inline void ceph_encode_addr(struct ceph_entity_addr *a)
107 {
108         __be16 ss_family = htons(a->in_addr.ss_family);
109         a->in_addr.ss_family = *(__u16 *)&ss_family;
110 }
111 static inline void ceph_decode_addr(struct ceph_entity_addr *a)
112 {
113         __be16 ss_family = *(__be16 *)&a->in_addr.ss_family;
114         a->in_addr.ss_family = ntohs(ss_family);
115         WARN_ON(a->in_addr.ss_family == 512);
116 }
117
118 /*
119  * encoders
120  */
121 static inline void ceph_encode_64(void **p, u64 v)
122 {
123         put_unaligned_le64(v, (__le64 *)*p);
124         *p += sizeof(u64);
125 }
126 static inline void ceph_encode_32(void **p, u32 v)
127 {
128         put_unaligned_le32(v, (__le32 *)*p);
129         *p += sizeof(u32);
130 }
131 static inline void ceph_encode_16(void **p, u16 v)
132 {
133         put_unaligned_le16(v, (__le16 *)*p);
134         *p += sizeof(u16);
135 }
136 static inline void ceph_encode_8(void **p, u8 v)
137 {
138         *(u8 *)*p = v;
139         (*p)++;
140 }
141 static inline void ceph_encode_copy(void **p, const void *s, int len)
142 {
143         memcpy(*p, s, len);
144         *p += len;
145 }
146
147 /*
148  * filepath, string encoders
149  */
150 static inline void ceph_encode_filepath(void **p, void *end,
151                                         u64 ino, const char *path)
152 {
153         u32 len = path ? strlen(path) : 0;
154         BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end);
155         ceph_encode_8(p, 1);
156         ceph_encode_64(p, ino);
157         ceph_encode_32(p, len);
158         if (len)
159                 memcpy(*p, path, len);
160         *p += len;
161 }
162
163 static inline void ceph_encode_string(void **p, void *end,
164                                       const char *s, u32 len)
165 {
166         BUG_ON(*p + sizeof(len) + len > end);
167         ceph_encode_32(p, len);
168         if (len)
169                 memcpy(*p, s, len);
170         *p += len;
171 }
172
173 #define ceph_encode_need(p, end, n, bad)                \
174         do {                                            \
175                 if (!likely(ceph_has_room(p, end, n)))  \
176                         goto bad;                       \
177         } while (0)
178
179 #define ceph_encode_64_safe(p, end, v, bad)                     \
180         do {                                                    \
181                 ceph_encode_need(p, end, sizeof(u64), bad);     \
182                 ceph_encode_64(p, v);                           \
183         } while (0)
184 #define ceph_encode_32_safe(p, end, v, bad)                     \
185         do {                                                    \
186                 ceph_encode_need(p, end, sizeof(u32), bad);     \
187                 ceph_encode_32(p, v);                   \
188         } while (0)
189 #define ceph_encode_16_safe(p, end, v, bad)                     \
190         do {                                                    \
191                 ceph_encode_need(p, end, sizeof(u16), bad);     \
192                 ceph_encode_16(p, v);                   \
193         } while (0)
194
195 #define ceph_encode_copy_safe(p, end, pv, n, bad)               \
196         do {                                                    \
197                 ceph_encode_need(p, end, n, bad);               \
198                 ceph_encode_copy(p, pv, n);                     \
199         } while (0)
200 #define ceph_encode_string_safe(p, end, s, n, bad)              \
201         do {                                                    \
202                 ceph_encode_need(p, end, n, bad);               \
203                 ceph_encode_string(p, end, s, n);               \
204         } while (0)
205
206
207 #endif