M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Virtio 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 <glib.h> |
| 15 | #include <glib/gprintf.h> |
| 16 | #include <sys/types.h> |
| 17 | #include <dirent.h> |
| 18 | #include <sys/time.h> |
| 19 | #include <utime.h> |
| 20 | #include <sys/uio.h> |
| 21 | #include <string.h> |
| 22 | #include <stdint.h> |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 23 | #include <errno.h> |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 24 | |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 25 | #include "qemu/compiler.h" |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 26 | #include "virtio-9p-marshal.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 27 | #include "qemu/bswap.h" |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 28 | |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 29 | void v9fs_string_free(V9fsString *str) |
| 30 | { |
| 31 | g_free(str->data); |
| 32 | str->data = NULL; |
| 33 | str->size = 0; |
| 34 | } |
| 35 | |
| 36 | void v9fs_string_null(V9fsString *str) |
| 37 | { |
| 38 | v9fs_string_free(str); |
| 39 | } |
| 40 | |
| 41 | void GCC_FMT_ATTR(2, 3) |
| 42 | v9fs_string_sprintf(V9fsString *str, const char *fmt, ...) |
| 43 | { |
| 44 | va_list ap; |
| 45 | |
| 46 | v9fs_string_free(str); |
| 47 | |
| 48 | va_start(ap, fmt); |
| 49 | str->size = g_vasprintf(&str->data, fmt, ap); |
| 50 | va_end(ap); |
| 51 | } |
| 52 | |
| 53 | void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs) |
| 54 | { |
| 55 | v9fs_string_free(lhs); |
| 56 | v9fs_string_sprintf(lhs, "%s", rhs->data); |
| 57 | } |
| 58 | |
| 59 | |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 60 | static ssize_t v9fs_packunpack(void *addr, struct iovec *sg, int sg_count, |
| 61 | size_t offset, size_t size, int pack) |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 62 | { |
| 63 | int i = 0; |
| 64 | size_t copied = 0; |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 65 | size_t req_size = size; |
| 66 | |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 67 | |
| 68 | for (i = 0; size && i < sg_count; i++) { |
| 69 | size_t len; |
| 70 | if (offset >= sg[i].iov_len) { |
| 71 | /* skip this sg */ |
| 72 | offset -= sg[i].iov_len; |
| 73 | continue; |
| 74 | } else { |
| 75 | len = MIN(sg[i].iov_len - offset, size); |
| 76 | if (pack) { |
| 77 | memcpy(sg[i].iov_base + offset, addr, len); |
| 78 | } else { |
| 79 | memcpy(addr, sg[i].iov_base + offset, len); |
| 80 | } |
| 81 | size -= len; |
| 82 | copied += len; |
| 83 | addr += len; |
| 84 | if (size) { |
| 85 | offset = 0; |
| 86 | continue; |
| 87 | } |
| 88 | } |
| 89 | } |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 90 | if (copied < req_size) { |
| 91 | /* |
| 92 | * We copied less that requested size. error out |
| 93 | */ |
| 94 | return -ENOBUFS; |
| 95 | } |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 96 | return copied; |
| 97 | } |
| 98 | |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 99 | static ssize_t v9fs_unpack(void *dst, struct iovec *out_sg, int out_num, |
| 100 | size_t offset, size_t size) |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 101 | { |
| 102 | return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0); |
| 103 | } |
| 104 | |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 105 | ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset, |
| 106 | const void *src, size_t size) |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 107 | { |
| 108 | return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1); |
| 109 | } |
| 110 | |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 111 | ssize_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset, |
| 112 | int bswap, const char *fmt, ...) |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 113 | { |
| 114 | int i; |
| 115 | va_list ap; |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 116 | ssize_t copied = 0; |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 117 | size_t old_offset = offset; |
| 118 | |
| 119 | va_start(ap, fmt); |
| 120 | for (i = 0; fmt[i]; i++) { |
| 121 | switch (fmt[i]) { |
| 122 | case 'b': { |
| 123 | uint8_t *valp = va_arg(ap, uint8_t *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 124 | copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 125 | break; |
| 126 | } |
| 127 | case 'w': { |
| 128 | uint16_t val, *valp; |
| 129 | valp = va_arg(ap, uint16_t *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 130 | copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 131 | if (bswap) { |
| 132 | *valp = le16_to_cpu(val); |
| 133 | } else { |
| 134 | *valp = val; |
| 135 | } |
| 136 | break; |
| 137 | } |
| 138 | case 'd': { |
| 139 | uint32_t val, *valp; |
| 140 | valp = va_arg(ap, uint32_t *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 141 | copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 142 | if (bswap) { |
| 143 | *valp = le32_to_cpu(val); |
| 144 | } else { |
| 145 | *valp = val; |
| 146 | } |
| 147 | break; |
| 148 | } |
| 149 | case 'q': { |
| 150 | uint64_t val, *valp; |
| 151 | valp = va_arg(ap, uint64_t *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 152 | copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 153 | if (bswap) { |
| 154 | *valp = le64_to_cpu(val); |
| 155 | } else { |
| 156 | *valp = val; |
| 157 | } |
| 158 | break; |
| 159 | } |
| 160 | case 's': { |
| 161 | V9fsString *str = va_arg(ap, V9fsString *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 162 | copied = v9fs_unmarshal(out_sg, out_num, offset, bswap, |
| 163 | "w", &str->size); |
| 164 | if (copied > 0) { |
| 165 | offset += copied; |
| 166 | str->data = g_malloc(str->size + 1); |
| 167 | copied = v9fs_unpack(str->data, out_sg, out_num, offset, |
| 168 | str->size); |
| 169 | if (copied > 0) { |
| 170 | str->data[str->size] = 0; |
| 171 | } else { |
| 172 | v9fs_string_free(str); |
| 173 | } |
| 174 | } |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 175 | break; |
| 176 | } |
| 177 | case 'Q': { |
| 178 | V9fsQID *qidp = va_arg(ap, V9fsQID *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 179 | copied = v9fs_unmarshal(out_sg, out_num, offset, bswap, "bdq", |
| 180 | &qidp->type, &qidp->version, &qidp->path); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 181 | break; |
| 182 | } |
| 183 | case 'S': { |
| 184 | V9fsStat *statp = va_arg(ap, V9fsStat *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 185 | copied = v9fs_unmarshal(out_sg, out_num, offset, bswap, |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 186 | "wwdQdddqsssssddd", |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 187 | &statp->size, &statp->type, &statp->dev, |
| 188 | &statp->qid, &statp->mode, &statp->atime, |
| 189 | &statp->mtime, &statp->length, |
| 190 | &statp->name, &statp->uid, &statp->gid, |
| 191 | &statp->muid, &statp->extension, |
| 192 | &statp->n_uid, &statp->n_gid, |
| 193 | &statp->n_muid); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 194 | break; |
| 195 | } |
| 196 | case 'I': { |
| 197 | V9fsIattr *iattr = va_arg(ap, V9fsIattr *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 198 | copied = v9fs_unmarshal(out_sg, out_num, offset, bswap, |
| 199 | "ddddqqqqq", |
| 200 | &iattr->valid, &iattr->mode, |
| 201 | &iattr->uid, &iattr->gid, &iattr->size, |
| 202 | &iattr->atime_sec, &iattr->atime_nsec, |
| 203 | &iattr->mtime_sec, &iattr->mtime_nsec); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 204 | break; |
| 205 | } |
| 206 | default: |
| 207 | break; |
| 208 | } |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 209 | if (copied < 0) { |
| 210 | va_end(ap); |
| 211 | return copied; |
| 212 | } |
| 213 | offset += copied; |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 214 | } |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 215 | va_end(ap); |
| 216 | |
| 217 | return offset - old_offset; |
| 218 | } |
| 219 | |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 220 | ssize_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset, |
| 221 | int bswap, const char *fmt, ...) |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 222 | { |
| 223 | int i; |
| 224 | va_list ap; |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 225 | ssize_t copied = 0; |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 226 | size_t old_offset = offset; |
| 227 | |
| 228 | va_start(ap, fmt); |
| 229 | for (i = 0; fmt[i]; i++) { |
| 230 | switch (fmt[i]) { |
| 231 | case 'b': { |
| 232 | uint8_t val = va_arg(ap, int); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 233 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 234 | break; |
| 235 | } |
| 236 | case 'w': { |
| 237 | uint16_t val; |
| 238 | if (bswap) { |
| 239 | cpu_to_le16w(&val, va_arg(ap, int)); |
| 240 | } else { |
| 241 | val = va_arg(ap, int); |
| 242 | } |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 243 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 244 | break; |
| 245 | } |
| 246 | case 'd': { |
| 247 | uint32_t val; |
| 248 | if (bswap) { |
| 249 | cpu_to_le32w(&val, va_arg(ap, uint32_t)); |
| 250 | } else { |
| 251 | val = va_arg(ap, uint32_t); |
| 252 | } |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 253 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 254 | break; |
| 255 | } |
| 256 | case 'q': { |
| 257 | uint64_t val; |
| 258 | if (bswap) { |
| 259 | cpu_to_le64w(&val, va_arg(ap, uint64_t)); |
| 260 | } else { |
| 261 | val = va_arg(ap, uint64_t); |
| 262 | } |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 263 | copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val)); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 264 | break; |
| 265 | } |
| 266 | case 's': { |
| 267 | V9fsString *str = va_arg(ap, V9fsString *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 268 | copied = v9fs_marshal(in_sg, in_num, offset, bswap, |
| 269 | "w", str->size); |
| 270 | if (copied > 0) { |
| 271 | offset += copied; |
| 272 | copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size); |
| 273 | } |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 274 | break; |
| 275 | } |
| 276 | case 'Q': { |
| 277 | V9fsQID *qidp = va_arg(ap, V9fsQID *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 278 | copied = v9fs_marshal(in_sg, in_num, offset, bswap, "bdq", |
| 279 | qidp->type, qidp->version, qidp->path); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 280 | break; |
| 281 | } |
| 282 | case 'S': { |
| 283 | V9fsStat *statp = va_arg(ap, V9fsStat *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 284 | copied = v9fs_marshal(in_sg, in_num, offset, bswap, |
| 285 | "wwdQdddqsssssddd", |
| 286 | statp->size, statp->type, statp->dev, |
| 287 | &statp->qid, statp->mode, statp->atime, |
| 288 | statp->mtime, statp->length, &statp->name, |
| 289 | &statp->uid, &statp->gid, &statp->muid, |
| 290 | &statp->extension, statp->n_uid, |
| 291 | statp->n_gid, statp->n_muid); |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 292 | break; |
| 293 | } |
| 294 | case 'A': { |
| 295 | V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *); |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 296 | copied = v9fs_marshal(in_sg, in_num, offset, bswap, |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 297 | "qQdddqqqqqqqqqqqqqqq", |
| 298 | statp->st_result_mask, |
| 299 | &statp->qid, statp->st_mode, |
| 300 | statp->st_uid, statp->st_gid, |
| 301 | statp->st_nlink, statp->st_rdev, |
| 302 | statp->st_size, statp->st_blksize, |
| 303 | statp->st_blocks, statp->st_atime_sec, |
| 304 | statp->st_atime_nsec, statp->st_mtime_sec, |
| 305 | statp->st_mtime_nsec, statp->st_ctime_sec, |
| 306 | statp->st_ctime_nsec, statp->st_btime_sec, |
| 307 | statp->st_btime_nsec, statp->st_gen, |
| 308 | statp->st_data_version); |
| 309 | break; |
| 310 | } |
| 311 | default: |
| 312 | break; |
| 313 | } |
M. Mohan Kumar | ddca7f8 | 2011-12-14 13:49:13 +0530 | [diff] [blame] | 314 | if (copied < 0) { |
| 315 | va_end(ap); |
| 316 | return copied; |
| 317 | } |
| 318 | offset += copied; |
M. Mohan Kumar | 10925bf | 2011-12-14 13:49:06 +0530 | [diff] [blame] | 319 | } |
| 320 | va_end(ap); |
| 321 | |
| 322 | return offset - old_offset; |
| 323 | } |