| 278 | } |
| 279 | |
| 280 | static int |
| 281 | get_seg_fd(char *path, int buflen, struct hugepage_info *hi, |
| 282 | unsigned int list_idx, unsigned int seg_idx, |
| 283 | bool *dirty) |
| 284 | { |
| 285 | int fd; |
| 286 | int *out_fd; |
| 287 | struct stat st; |
| 288 | int ret; |
| 289 | const struct internal_config *internal_conf = |
| 290 | eal_get_internal_configuration(); |
| 291 | |
| 292 | if (dirty != NULL) |
| 293 | *dirty = false; |
| 294 | |
| 295 | /* for in-memory mode, we only make it here when we're sure we support |
| 296 | * memfd, and this is a special case. |
| 297 | */ |
| 298 | if (internal_conf->in_memory) |
| 299 | return get_seg_memfd(hi, list_idx, seg_idx); |
| 300 | |
| 301 | if (internal_conf->single_file_segments) { |
| 302 | out_fd = &fd_list[list_idx].memseg_list_fd; |
| 303 | eal_get_hugefile_path(path, buflen, hi->hugedir, list_idx); |
| 304 | } else { |
| 305 | out_fd = &fd_list[list_idx].fds[seg_idx]; |
| 306 | eal_get_hugefile_path(path, buflen, hi->hugedir, |
| 307 | list_idx * RTE_MAX_MEMSEG_PER_LIST + seg_idx); |
| 308 | } |
| 309 | fd = *out_fd; |
| 310 | if (fd >= 0) |
| 311 | return fd; |
| 312 | |
| 313 | /* |
| 314 | * There is no TOCTOU between stat() and unlink()/open() |
| 315 | * because the hugepage directory is locked. |
| 316 | */ |
| 317 | ret = stat(path, &st); |
| 318 | if (ret < 0 && errno != ENOENT) { |
| 319 | RTE_LOG(DEBUG, EAL, "%s(): stat() for '%s' failed: %s\n", |
| 320 | __func__, path, strerror(errno)); |
| 321 | return -1; |
| 322 | } |
| 323 | if (!internal_conf->hugepage_file.unlink_existing && ret == 0 && |
| 324 | dirty != NULL) |
| 325 | *dirty = true; |
| 326 | |
| 327 | /* |
| 328 | * The kernel clears a hugepage only when it is mapped |
| 329 | * from a particular file for the first time. |
| 330 | * If the file already exists, the old content will be mapped. |
| 331 | * If the memory manager assumes all mapped pages to be clean, |
| 332 | * the file must be removed and created anew. |
| 333 | * Otherwise, the primary caller must be notified |
| 334 | * that mapped pages will be dirty |
| 335 | * (secondary callers receive the segment state from the primary one). |
| 336 | * When multiple hugepages are mapped from the same file, |
| 337 | * whether they will be dirty depends on the part that is mapped. |
no test coverage detected