| 1 | /* |
| 2 | * 9p backend |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2010 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Anthony Liguori <aliguori@us.ibm.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 10 | * the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include "qemu/osdep.h" |
| 15 | #include <glib/gprintf.h> |
| 16 | #include <utime.h> |
| 17 | |
| 18 | #include "9p-iov-marshal.h" |
| 19 | #include "qemu/bswap.h" |
| 20 | |
| 21 | static ssize_t v9fs_packunpack(void *addr, struct iovec *sg, int sg_count, |
| 22 | size_t offset, size_t size, int pack) |
| 23 | { |
| 24 | int i = 0; |
| 25 | size_t copied = 0; |
| 26 | size_t req_size = size; |
| 27 | |
| 28 | |
| 29 | for (i = 0; size && i < sg_count; i++) { |
| 30 | size_t len; |
| 31 | if (offset >= sg[i].iov_len) { |
| 32 | /* skip this sg */ |
| 33 | offset -= sg[i].iov_len; |
| 34 | continue; |
| 35 | } else { |
| 36 | len = MIN(sg[i].iov_len - offset, size); |
| 37 | if (pack) { |
| 38 | memcpy(sg[i].iov_base + offset, addr, len); |
| 39 | } else { |
| 40 | memcpy(addr, sg[i].iov_base + offset, len); |
| 41 | } |
| 42 | size -= len; |
| 43 | copied += len; |
| 44 | addr += len; |
| 45 | if (size) { |
| 46 | offset = 0; |
| 47 | continue; |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | if (copied < req_size) { |
| 52 | /* |
| 53 | * We copied less that requested size. error out |
| 54 | */ |
| 55 | return -ENOBUFS; |
| 56 | } |
| 57 | return copied; |
| 58 | } |
| 59 | |
| 60 | static ssize_t v9fs_unpack(void *dst, struct iovec *out_sg, int out_num, |
| 61 | size_t offset, size_t size) |
| 62 | { |
| 63 | return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0); |
| 64 | } |
| 65 | |
| 66 | ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset, |
| 67 | const void *src, size_t size) |
| 68 | { |
| 69 | return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1); |
| 70 | } |
| 71 | |
| 72 | ssize_t v9fs_iov_vunmarshal(struct iovec *out_sg, int out_num, size_t offset, |
| 73 | int bswap, const char *fmt, va_list ap) |
| 74 | { |
| 75 | int i; |
| 76 | ssize_t copied = 0; |
| 77 | size_t old_offset = offset; |
| 78 | |
| 79 | for (i = 0; fmt[i]; i++) { |
| 80 | switch (fmt[i]) { |
| 81 | case 'b': { |
| 82 | uint8_t *valp = va_arg(ap, uint8_t *); |
| 83 | copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp)); |
| 84 | break; |
| 85 | } |
| 86 | case 'w': { |
| 87 | uint16_t val = 0, *valp; |
| 88 | valp = va_arg(ap, uint16_t *); |
| 89 | copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val)); |
| 90 | if (copied <= 0) { |
| 91 | break; |
| 92 | } |
| 93 | if (bswap) { |
| 94 | *valp = le16_to_cpu(val); |
| 95 | } else { |
| 96 | *valp = val; |
| 97 | } |
| 98 | break; |
| 99 | } |
| 100 | case 'd': { |
| 101 | uint32_t val = 0, *valp; |
| 102 | valp = va_arg(ap, uint32_t *); |
| 103 | copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val)); |
| 104 | if (copied <= 0) { |
| 105 | break; |
| 106 | } |
| 107 | if (bswap) { |
| 108 | *valp = le32_to_cpu(val); |
| 109 | } else { |
| 110 | *valp = val; |
| 111 | } |
| 112 | break; |
| 113 | } |
| 114 | case 'q': { |
| 115 | uint64_t val = 0, *valp; |
| 116 | valp = va_arg(ap, uint64_t *); |
| 117 | copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val)); |
| 118 | if (copied <= 0) { |
| 119 | break; |
| 120 | } |
| 121 | if (bswap) { |
| 122 | *valp = le64_to_cpu(val); |
| 123 | } else { |
| 124 | *valp = val; |
| 125 | } |
| 126 | break; |
| 127 | } |
| 128 | case 's': { |
| 129 | V9fsString *str = va_arg(ap, V9fsString *); |
| 130 | copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap, |
| 131 | "w", &str->size); |
| 132 | if (copied > 0) { |
| 133 | offset += copied; |
| 134 | str->data = g_malloc(str->size + 1); |
| 135 | copied = v9fs_unpack(str->data, out_sg, out_num, offset, |
| 136 | str->size); |
| 137 | if (copied >= 0) { |
| 138 | str->data[str->size] = 0; |
| 139 | } else { |
| 140 | v9fs_string_free(str); |
| 141 | } |
| 142 | } |
| 143 | break; |
| 144 | } |
| 145 | case 'Q': { |
| 146 | V9fsQID *qidp = va_arg(ap, V9fsQID *); |
| 147 | copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap, |
| 148 | "bdq", &qidp->type, &qidp->version, |
| 149 | &qidp->path); |
| 150 | break; |
| 151 | } |
| 152 | case 'S': { |
| 153 | V9fsStat *statp = va_arg(ap, V9fsStat *); |
| 154 | copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap, |
| 155 | "wwdQdddqsssssddd", |
| 156 | &statp->size, &statp->type, |
| 157 | &statp->dev, &statp->qid, |
| 158 | &statp->mode, &statp->atime, |
| 159 | &statp->mtime, &statp->length, |
| 160 | &statp->name, &statp->uid, |
| 161 | &statp->gid, &statp->muid, |
| 162 | &statp->extension, |
| 163 | &statp->n_uid, &statp->n_gid, |
| 164 | &statp->n_muid); |
| 165 | break; |
| 166 | } |
| 167 | case 'I': { |
| 168 | V9fsIattr *iattr = va_arg(ap, V9fsIattr *); |
| 169 | copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap, |
| 170 | "ddddqqqqq", |
| 171 | &iattr->valid, &iattr->mode, |
| 172 | &iattr->uid, &iattr->gid, |
| 173 | &iattr->size, &iattr->atime_sec, |
| 174 | &iattr->atime_nsec, |
| 175 | &iattr->mtime_sec, |
| 176 | &iattr->mtime_nsec); |
| 177 | break; |
| 178 | } |
| 179 | default: |
| 180 | g_assert_not_reached(); |
| 181 | } |
| 182 | if (copied < 0) { |
| 183 | return copied; |
| 184 | } |
| 185 | offset += copied; |
| 186 | } |
| 187 | |
| 188 | return offset - old_offset; |
| 189 | } |
| 190 | |
| 191 | ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset, |
| 192 | int bswap, const char *fmt, ...) |
| 193 | { |
| 194 | ssize_t ret; |
| 195 | va_list ap; |
| 196 | |
| 197 | va_start(ap, fmt); |
| 198 | ret = v9fs_iov_vunmarshal(out_sg, out_num, offset, bswap, fmt, ap); |
| 199 | va_end(ap); |
| 200 | |
| 201 | return ret; |
| 202 | } |
| 203 | |
| 204 | ssize_t v9fs_iov_vmarshal(struct iovec *in_sg, int in_num, size_t offset, |
| 205 | int bswap, const char *fmt, va_list ap) |
| 206 | { |
| 207 | int i; |
| 208 | ssize_t copied = 0; |
| 209 | size_t old_offset = offset; |
| 210 | |
| 211 | for (i = 0; fmt[i]; i++) { |
| 212 | switch (fmt[i]) { |
| 213 | case 'b': { |
| 214 | uint8_t val = va_arg(ap, int); |
| 215 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
| 216 | break; |
| 217 | } |
| 218 | case 'w': { |
| 219 | uint16_t val = va_arg(ap, int); |
| 220 | if (bswap) { |
| 221 | val = cpu_to_le16(val); |
| 222 | } |
| 223 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
| 224 | break; |
| 225 | } |
| 226 | case 'd': { |
| 227 | uint32_t val = va_arg(ap, uint32_t); |
| 228 | if (bswap) { |
| 229 | val = cpu_to_le32(val); |
| 230 | } |
| 231 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
| 232 | break; |
| 233 | } |
| 234 | case 'q': { |
| 235 | uint64_t val = va_arg(ap, uint64_t); |
| 236 | if (bswap) { |
| 237 | val = cpu_to_le64(val); |
| 238 | } |
| 239 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
| 240 | break; |
| 241 | } |
| 242 | case 's': { |
| 243 | V9fsString *str = va_arg(ap, V9fsString *); |
| 244 | copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, |
| 245 | "w", str->size); |
| 246 | if (copied > 0) { |
| 247 | offset += copied; |
| 248 | copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size); |
| 249 | } |
| 250 | break; |
| 251 | } |
| 252 | case 'Q': { |
| 253 | V9fsQID *qidp = va_arg(ap, V9fsQID *); |
| 254 | copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, "bdq", |
| 255 | qidp->type, qidp->version, |
| 256 | qidp->path); |
| 257 | break; |
| 258 | } |
| 259 | case 'S': { |
| 260 | V9fsStat *statp = va_arg(ap, V9fsStat *); |
| 261 | copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, |
| 262 | "wwdQdddqsssssddd", |
| 263 | statp->size, statp->type, statp->dev, |
| 264 | &statp->qid, statp->mode, statp->atime, |
| 265 | statp->mtime, statp->length, |
| 266 | &statp->name, |
| 267 | &statp->uid, &statp->gid, &statp->muid, |
| 268 | &statp->extension, statp->n_uid, |
| 269 | statp->n_gid, statp->n_muid); |
| 270 | break; |
| 271 | } |
| 272 | case 'A': { |
| 273 | V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *); |
| 274 | copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, |
| 275 | "qQdddqqqqqqqqqqqqqqq", |
| 276 | statp->st_result_mask, |
| 277 | &statp->qid, statp->st_mode, |
| 278 | statp->st_uid, statp->st_gid, |
| 279 | statp->st_nlink, statp->st_rdev, |
| 280 | statp->st_size, statp->st_blksize, |
| 281 | statp->st_blocks, statp->st_atime_sec, |
| 282 | statp->st_atime_nsec, |
| 283 | statp->st_mtime_sec, |
| 284 | statp->st_mtime_nsec, |
| 285 | statp->st_ctime_sec, |
| 286 | statp->st_ctime_nsec, |
| 287 | statp->st_btime_sec, |
| 288 | statp->st_btime_nsec, statp->st_gen, |
| 289 | statp->st_data_version); |
| 290 | break; |
| 291 | } |
| 292 | default: |
| 293 | g_assert_not_reached(); |
| 294 | } |
| 295 | if (copied < 0) { |
| 296 | return copied; |
| 297 | } |
| 298 | offset += copied; |
| 299 | } |
| 300 | |
| 301 | return offset - old_offset; |
| 302 | } |
| 303 | |
| 304 | ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset, |
| 305 | int bswap, const char *fmt, ...) |
| 306 | { |
| 307 | ssize_t ret; |
| 308 | va_list ap; |
| 309 | |
| 310 | va_start(ap, fmt); |
| 311 | ret = v9fs_iov_vmarshal(in_sg, in_num, offset, bswap, fmt, ap); |
| 312 | va_end(ap); |
| 313 | |
| 314 | return ret; |
| 315 | } |