| 360 | } |
| 361 | |
| 362 | const char * |
| 363 | Span::init(const char *path, int64_t size) |
| 364 | { |
| 365 | struct stat sbuf; |
| 366 | struct statvfs vbuf; |
| 367 | span_error_t serr; |
| 368 | ink_device_geometry geometry; |
| 369 | |
| 370 | ats_scoped_fd fd(safe_open(path, O_RDONLY)); |
| 371 | if (fd < 0) { |
| 372 | serr = make_span_error(errno); |
| 373 | Warning("unable to open '%s': %s", path, strerror(errno)); |
| 374 | goto fail; |
| 375 | } |
| 376 | |
| 377 | if (fstat(fd, &sbuf) == -1) { |
| 378 | serr = make_span_error(errno); |
| 379 | Warning("unable to stat '%s': %s (%d)", path, strerror(errno), errno); |
| 380 | goto fail; |
| 381 | } |
| 382 | |
| 383 | if (fstatvfs(fd, &vbuf) == -1) { |
| 384 | serr = make_span_error(errno); |
| 385 | Warning("unable to statvfs '%s': %s (%d)", path, strerror(errno), errno); |
| 386 | goto fail; |
| 387 | } |
| 388 | |
| 389 | // Directories require an explicit size parameter. For device nodes and files, we use |
| 390 | // the existing size. |
| 391 | if (S_ISDIR(sbuf.st_mode)) { |
| 392 | if (size <= 0) { |
| 393 | Warning("cache %s '%s' requires a size > 0", span_file_typename(sbuf.st_mode), path); |
| 394 | serr = SPAN_ERROR_MISSING_SIZE; |
| 395 | goto fail; |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | // Should regular files use the IO size (vbuf.f_bsize), or the |
| 400 | // fundamental filesystem block size (vbuf.f_frsize)? That depends |
| 401 | // on whether we are using that block size for performance or for |
| 402 | // reliability. |
| 403 | |
| 404 | switch (sbuf.st_mode & S_IFMT) { |
| 405 | case S_IFBLK: |
| 406 | case S_IFCHR: |
| 407 | |
| 408 | #if defined(__linux__) |
| 409 | if (major(sbuf.st_rdev) == RAW_MAJOR && minor(sbuf.st_rdev) == 0) { |
| 410 | Warning("cache %s '%s' is the raw device control interface", span_file_typename(sbuf.st_mode), path); |
| 411 | serr = SPAN_ERROR_UNSUPPORTED_DEVTYPE; |
| 412 | goto fail; |
| 413 | } |
| 414 | #endif |
| 415 | |
| 416 | if (!ink_file_get_geometry(fd, geometry)) { |
| 417 | serr = make_span_error(errno); |
| 418 | |
| 419 | if (errno == ENOTSUP) { |