/*
* devname - search for device name
*
- * Copyright (C) 2004, Jana Saout <jana@saout.de>
- * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
- * Copyright (C) 2009-2013, Milan Broz
+ * Copyright (C) 2004 Jana Saout <jana@saout.de>
+ * Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
+ * Copyright (C) 2009-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2023 Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
-#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
+#ifdef HAVE_SYS_SYSMACROS_H
+# include <sys/sysmacros.h> /* for major, minor */
+#endif
#include "internal.h"
static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
return result;
/* If it is dm, try DM dir */
- if (dm_is_dm_device(major, minor)) {
+ if (dm_is_dm_device(major)) {
strncpy(buf, dm_get_dir(), PATH_MAX);
if ((result = __lookup_dev(buf, dev, 0, 0)))
return result;
major(st.st_rdev), minor(st.st_rdev)) < 0)
return NULL;
+ dir = opendir(path);
+ if (!dir)
+ return NULL;
+
len = readlink(path, link, sizeof(link) - 1);
- if (len < 0)
+ if (len < 0) {
+ closedir(dir);
return NULL;
+ }
/* Get top level disk name for sysfs search */
link[len] = '\0';
devname = strrchr(link, '/');
- if (!devname)
+ if (!devname) {
+ closedir(dir);
return NULL;
+ }
devname++;
/* DM devices do not use kernel partitions. */
- if (dm_is_dm_kernel_name(devname))
- return NULL;
-
- dir = opendir(path);
- if (!dir)
+ if (dm_is_dm_kernel_name(devname)) {
+ closedir(dir);
return NULL;
+ }
devname_len = strlen(devname);
while((entry = readdir(dir))) {
if (dm_is_dm_kernel_name(devname))
return NULL;
- snprintf(part_path, sizeof(part_path), "/dev/%s", devname);
+ if (snprintf(part_path, sizeof(part_path), "/dev/%s", devname) < 0)
+ return NULL;
+
return strdup(part_path);
}
+
+int lookup_by_disk_id(const char *dm_uuid)
+{
+ struct dirent *entry;
+ struct stat st;
+ int r = 0; /* not found */
+ DIR *dir = opendir("/dev/disk/by-id");
+
+ if (!dir)
+ /* map ENOTDIR to ENOENT we'll handle both errors same */
+ return errno == ENOTDIR ? -ENOENT : -errno;
+
+ while ((entry = readdir(dir))) {
+ if (entry->d_name[0] == '.' ||
+ !strncmp(entry->d_name, "..", 2))
+ continue;
+
+ if (fstatat(dirfd(dir), entry->d_name, &st, AT_SYMLINK_NOFOLLOW)) {
+ r = -EINVAL;
+ break;
+ }
+
+ if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
+ continue;
+
+ if (!strncmp(entry->d_name, dm_uuid, strlen(dm_uuid))) {
+ r = 1;
+ break;
+ }
+ }
+
+ closedir(dir);
+
+ return r;
+}
+
+int lookup_by_sysfs_uuid_field(const char *dm_uuid)
+{
+ struct dirent *entry;
+ char subpath[PATH_MAX], uuid[DM_UUID_LEN];
+ ssize_t s;
+ struct stat st;
+ int fd, len, r = 0; /* not found */
+ DIR *dir = opendir("/sys/block/");
+
+ if (!dir)
+ /* map ENOTDIR to ENOENT we'll handle both errors same */
+ return errno == ENOTDIR ? -ENOENT : -errno;
+
+ while (r != 1 && (entry = readdir(dir))) {
+ if (entry->d_name[0] == '.' ||
+ !strncmp(entry->d_name, "..", 2))
+ continue;
+
+ len = snprintf(subpath, PATH_MAX, "%s/%s", entry->d_name, "dm/uuid");
+ if (len < 0 || len >= PATH_MAX) {
+ r = -EINVAL;
+ break;
+ }
+
+ /* looking for dm-X/dm/uuid file, symlinks are fine */
+ fd = openat(dirfd(dir), subpath, O_RDONLY | O_CLOEXEC);
+ if (fd < 0)
+ continue;
+
+ if (fstat(fd, &st) || !S_ISREG(st.st_mode)) {
+ close(fd);
+ continue;
+ }
+
+ /* reads binary data */
+ s = read_buffer(fd, uuid, sizeof(uuid) - 1);
+ if (s > 0) {
+ uuid[s] = '\0';
+ if (!strncmp(uuid, dm_uuid, strlen(dm_uuid)))
+ r = 1;
+ }
+
+ close(fd);
+ }
+
+ closedir(dir);
+
+ return r;
+}