void blkid__scan_dir(char *dirname, dev_t devno, struct dir_list **list,
char **devname)
{
DIR *dir;
struct dirent *dp;
struct stat st;
if ((dir = opendir(dirname)) == NULL)
return;
while ((dp = readdir(dir)) != NULL) {
#ifdef _DIRENT_HAVE_D_TYPE
if (dp->d_type != DT_UNKNOWN && dp->d_type != DT_BLK &&
dp->d_type != DT_LNK && dp->d_type != DT_DIR)
continue;
#endif
if (dp->d_name[0] == '.' &&
((dp->d_name[1] == 0) ||
((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
continue;
if (fstat_at(dirfd(dir), dirname, dp->d_name, &st, 0))
continue;
if (S_ISBLK(st.st_mode) && st.st_rdev == devno) {
*devname = blkid_strconcat(dirname, "/", dp->d_name);
DBG(DEBUG_DEVNO,
printf("found 0x%llx at %s\n", (long long)devno,
*devname));
break;
}
if (!list || !S_ISDIR(st.st_mode))
continue;
/* add subdirectory (but not symlink) to the list */
#ifdef _DIRENT_HAVE_D_TYPE
if (dp->d_type == DT_LNK)
continue;
if (dp->d_type == DT_UNKNOWN)
#endif
{
if (fstat_at(dirfd(dir), dirname, dp->d_name, &st, 1) ||
!S_ISDIR(st.st_mode))
continue; /* symlink or lstat() failed */
}
if (*dp->d_name == '.' || (
#ifdef _DIRENT_HAVE_D_TYPE
dp->d_type == DT_DIR &&
#endif
strcmp(dp->d_name, "shm") == 0))
/* ignore /dev/.{udev,mount,mdadm} and /dev/shm */
continue;
add_to_dirlist(dirname, dp->d_name, list);
}
closedir(dir);
return;
}
/*
* This function finds the pathname to a block device with a given
* device number. It returns a pointer to allocated memory to the
* pathname on success, and NULL on failure.
*/
char *ext2fs_find_block_device(dev_t device)
{
struct dir_list *list = NULL, *new_list = NULL;
struct dir_list *current;
char *ret_path = NULL;
/*
* Add the starting directories to search...
*/
add_to_dirlist("/devices", &list);
add_to_dirlist("/devfs", &list);
add_to_dirlist("/dev", &list);
while (list) {
current = list;
list = list->next;
#ifdef DEBUG
printf("Scanning directory %s\n", current->name);
#endif
scan_dir(current->name, device, &new_list, &ret_path);
free(current->name);
free(current);
if (ret_path)
break;
/*
* If we're done checking at this level, descend to
* the next level of subdirectories. (breadth-first)
*/
if (list == 0) {
list = new_list;
new_list = 0;
}
}
free_dirlist(&list);
free_dirlist(&new_list);
return ret_path;
}
/**
* blkid_devno_to_devname:
* @devno: device number
*
* This function finds the pathname to a block device with a given
* device number.
*
* Returns: a pointer to allocated memory to the pathname on success,
* and NULL on failure.
*/
char *blkid_devno_to_devname(dev_t devno)
{
struct dir_list *list = NULL, *new_list = NULL;
char *devname = NULL;
const char **dir;
/*
* Add the starting directories to search in reverse order of
* importance, since we are using a stack...
*/
for (dir = devdirs; *dir; dir++)
add_to_dirlist(*dir, NULL, &list);
while (list) {
struct dir_list *current = list;
list = list->next;
DBG(DEBUG_DEVNO, printf("directory %s\n", current->name));
blkid__scan_dir(current->name, devno, &new_list, &devname);
free(current->name);
free(current);
if (devname)
break;
/*
* If we're done checking at this level, descend to
* the next level of subdirectories. (breadth-first)
*/
if (list == NULL) {
list = new_list;
new_list = NULL;
}
}
free_dirlist(&list);
free_dirlist(&new_list);
if (!devname) {
DBG(DEBUG_DEVNO,
printf("blkid: couldn't find devno 0x%04lx\n",
(unsigned long) devno));
} else {
DBG(DEBUG_DEVNO,
printf("found devno 0x%04llx as %s\n", (long long)devno, devname));
}
return devname;
}
static int scan_dir(char *dirname, dev_t device, struct dir_list **list,
char **ret_path)
{
DIR *dir;
struct dirent *dp;
char path[1024], *cp;
int dirlen;
struct stat st;
dirlen = strlen(dirname);
if ((dir = opendir(dirname)) == NULL)
return errno;
dp = readdir(dir);
while (dp) {
if (dirlen + strlen(dp->d_name) + 2 >= sizeof(path))
goto skip_to_next;
if (dp->d_name[0] == '.' &&
((dp->d_name[1] == 0) ||
((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
goto skip_to_next;
sprintf(path, "%s/%s", dirname, dp->d_name);
if (stat(path, &st) < 0)
goto skip_to_next;
if (S_ISDIR(st.st_mode))
add_to_dirlist(path, list);
if (S_ISBLK(st.st_mode) && st.st_rdev == device) {
cp = malloc(strlen(path)+1);
if (!cp) {
closedir(dir);
return ENOMEM;
}
strcpy(cp, path);
*ret_path = cp;
goto success;
}
skip_to_next:
dp = readdir(dir);
}
success:
closedir(dir);
return 0;
}
void blkid__scan_dir(char *dirname, dev_t devno, struct dir_list **list,
char **devname)
{
DIR *dir;
struct dirent *dp;
char path[1024];
int dirlen;
struct stat st;
if ((dir = opendir(dirname)) == NULL)
return;
dirlen = strlen(dirname) + 2;
while ((dp = readdir(dir)) != 0) {
if (dirlen + strlen(dp->d_name) >= sizeof(path))
continue;
if (dp->d_name[0] == '.' &&
((dp->d_name[1] == 0) ||
((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
continue;
sprintf(path, "%s/%s", dirname, dp->d_name);
if (stat(path, &st) < 0)
continue;
if (S_ISBLK(st.st_mode) && st.st_rdev == devno) {
*devname = blkid_strdup(path);
DBG(DEBUG_DEVNO,
printf("found 0x%llx at %s (%p)\n", (long long)devno,
path, *devname));
break;
}
if (list && S_ISDIR(st.st_mode) && !lstat(path, &st) &&
S_ISDIR(st.st_mode))
add_to_dirlist(path, list);
}
closedir(dir);
return;
}
static char *scandev_devno_to_devpath(dev_t devno)
{
struct dir_list *list = NULL, *new_list = NULL;
char *devname = NULL;
const char **dir;
/*
* Add the starting directories to search in reverse order of
* importance, since we are using a stack...
*/
for (dir = devdirs; *dir; dir++)
add_to_dirlist(*dir, NULL, &list);
while (list) {
struct dir_list *current = list;
list = list->next;
DBG(DEVNO, ul_debug("directory %s", current->name));
blkid__scan_dir(current->name, devno, &new_list, &devname);
free(current->name);
free(current);
if (devname)
break;
/*
* If we're done checking at this level, descend to
* the next level of subdirectories. (breadth-first)
*/
if (list == NULL) {
list = new_list;
new_list = NULL;
}
}
free_dirlist(&list);
free_dirlist(&new_list);
return devname;
}
