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