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* finddev.c -- this routine attempts to find a particular device in
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* Copyright (C) 2000 Theodore Ts'o.
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* This file may be redistributed under the terms of the GNU Public
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#include <sys/types.h>
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#include <sys/mkdev.h>
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struct dir_list *next;
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* This function adds an entry to the directory list
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static void add_to_dirlist(const char *name, struct dir_list **list)
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dp = malloc(sizeof(struct dir_list));
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dp->name = malloc(strlen(name)+1);
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strcpy(dp->name, name);
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* This function frees a directory list
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static void free_dirlist(struct dir_list **list)
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struct dir_list *dp, *next;
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for (dp = *list; dp; dp = next) {
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static int scan_dir(char *dirname, dev_t device, struct dir_list **list,
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dirlen = strlen(dirname);
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if ((dir = opendir(dirname)) == NULL)
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if (dirlen + strlen(dp->d_name) + 2 >= sizeof(path))
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if (dp->d_name[0] == '.' &&
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((dp->d_name[1] == 0) ||
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((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
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sprintf(path, "%s/%s", dirname, dp->d_name);
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if (stat(path, &st) < 0)
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if (S_ISDIR(st.st_mode))
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add_to_dirlist(path, list);
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if (S_ISBLK(st.st_mode) && st.st_rdev == device) {
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cp = malloc(strlen(path)+1);
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* This function finds the pathname to a block device with a given
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* device number. It returns a pointer to allocated memory to the
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* pathname on success, and NULL on failure.
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char *ext2fs_find_block_device(dev_t device)
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struct dir_list *list = 0, *new_list = 0;
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struct dir_list *current;
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* Add the starting directories to search...
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add_to_dirlist("/devices", &list);
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add_to_dirlist("/devfs", &list);
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add_to_dirlist("/dev", &list);
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printf("Scanning directory %s\n", current->name);
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scan_dir(current->name, device, &new_list, &ret_path);
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* If we're done checking at this level, descend to
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* the next level of subdirectories. (breadth-first)
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free_dirlist(&new_list);
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int main(int argc, char** argv)
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const char *errmsg = "Couldn't parse %s: %s\n";
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if ((argc != 2) && (argc != 3)) {
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fprintf(stderr, "Usage: %s device_number\n", argv[0]);
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fprintf(stderr, "\t: %s major minor\n", argv[0]);
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device = strtoul(argv[1], &tmp, 0);
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fprintf(stderr, errmsg, "device number", argv[1]);
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major = strtoul(argv[1], &tmp, 0);
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fprintf(stderr, errmsg, "major number", argv[1]);
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minor = strtoul(argv[2], &tmp, 0);
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fprintf(stderr, errmsg, "minor number", argv[2]);
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device = makedev(major, minor);
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printf("Looking for device 0x%04x (%d:%d)\n", device,
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devname = ext2fs_find_block_device(device);
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printf("Found device! %s\n", devname);
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printf("Couldn't find device.\n");