oslib/linux-dev-lookup.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <dirent.h>
   4 #include <string.h>
   5 #include <stdio.h>
   6 #include <unistd.h>
   7
   8 #include "../os/os.h"
   9
  10 int blktrace_lookup_device(const char *redirect, char *path, unsigned int maj,
  11                            unsigned int min)
  12 {
  13         struct dirent *dir;
  14         struct stat st;
  15         int found = 0;
  16         DIR *D;
  17
  18         D = opendir(path);
  19         if (!D)
  20                 return 0;
  21
  22         while ((dir = readdir(D)) != NULL) {
  23                 char full_path[256];
  24
  25                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
  26                         continue;
  27
  28                 sprintf(full_path, "%s%s%s", path, FIO_OS_PATH_SEPARATOR, dir->d_name);
  29                 if (lstat(full_path, &st) == -1) {
  30                         perror("lstat");
  31                         break;
  32                 }
  33
  34                 if (S_ISDIR(st.st_mode)) {
  35                         found = blktrace_lookup_device(redirect, full_path,
  36                                                                 maj, min);
  37                         if (found) {
  38                                 strcpy(path, full_path);
  39                                 break;
  40                         }
  41                 }
  42
  43                 if (!S_ISBLK(st.st_mode))
  44                         continue;
  45
  46                 /*
  47                  * If replay_redirect is set then always return this device
  48                  * upon lookup which overrides the device lookup based on
  49                  * major minor in the actual blktrace
  50                  */
  51                 if (redirect) {
  52                         strcpy(path, redirect);
  53                         found = 1;
  54                         break;
  55                 }
  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 }