| 1 | #include <sys/types.h> |
| 2 | #include <sys/stat.h> |
| 3 | #include <sys/sysmacros.h> |
| 4 | #include <dirent.h> |
| 5 | #include <string.h> |
| 6 | #include <stdio.h> |
| 7 | #include <unistd.h> |
| 8 | |
| 9 | #include "linux-dev-lookup.h" |
| 10 | |
| 11 | int blktrace_lookup_device(const char *redirect, char *path, unsigned int maj, |
| 12 | unsigned int min) |
| 13 | { |
| 14 | struct dirent *dir; |
| 15 | struct stat st; |
| 16 | int found = 0; |
| 17 | DIR *D; |
| 18 | |
| 19 | /* |
| 20 | * If replay_redirect is set then always return this device |
| 21 | * upon lookup which overrides the device lookup based on |
| 22 | * major minor in the actual blktrace |
| 23 | */ |
| 24 | if (redirect) { |
| 25 | strcpy(path, redirect); |
| 26 | return 1; |
| 27 | } |
| 28 | |
| 29 | D = opendir(path); |
| 30 | if (!D) |
| 31 | return 0; |
| 32 | |
| 33 | while ((dir = readdir(D)) != NULL) { |
| 34 | char full_path[257]; |
| 35 | |
| 36 | if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")) |
| 37 | continue; |
| 38 | |
| 39 | sprintf(full_path, "%s/%s", path, dir->d_name); |
| 40 | if (lstat(full_path, &st) == -1) { |
| 41 | perror("lstat"); |
| 42 | break; |
| 43 | } |
| 44 | |
| 45 | if (S_ISDIR(st.st_mode)) { |
| 46 | found = blktrace_lookup_device(redirect, full_path, |
| 47 | maj, min); |
| 48 | if (found) { |
| 49 | strcpy(path, full_path); |
| 50 | break; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | if (!S_ISBLK(st.st_mode)) |
| 55 | continue; |
| 56 | |
| 57 | if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) { |
| 58 | strcpy(path, full_path); |
| 59 | found = 1; |
| 60 | break; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | closedir(D); |
| 65 | return found; |
| 66 | } |