/*
* devname - search for device name
*
- * Copyright (C) 2004, Christophe Saout <christophe@saout.de>
+ * Copyright (C) 2004, Jana Saout <jana@saout.de>
* Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2009-2011, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2013, Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include <stdio.h>
+#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>
#include "internal.h"
-#define DEVICE_DIR "/dev"
-
static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
{
struct dirent *entry;
!strncmp(entry->d_name, "..", 2))
continue;
+ if (dir_level == 0 &&
+ (!strcmp(entry->d_name, "shm") ||
+ !strcmp(entry->d_name, "fd") ||
+ !strcmp(entry->d_name, "char") ||
+ !strcmp(entry->d_name, "pts")))
+ continue;
+
strncpy(ptr, entry->d_name, space);
if (stat(path, &st) < 0)
continue;
break;
} else if (S_ISBLK(st.st_mode)) {
/* workaround: ignore dm-X devices, these are internal kernel names */
- if (dir_level == 0 && !strncmp(entry->d_name, "dm-", 3))
+ if (dir_level == 0 && dm_is_dm_kernel_name(entry->d_name))
continue;
if (st.st_rdev == dev) {
result = strdup(path);
/*
* Non-udev systemd need to scan for device here.
*/
-static char *lookup_dev_old(const char *dev_id)
+static char *lookup_dev_old(int major, int minor)
{
- int major, minor;
dev_t dev;
char *result = NULL, buf[PATH_MAX + 1];
- if (sscanf(dev_id, "%d:%d", &major, &minor) != 2)
- return NULL;
-
dev = makedev(major, minor);
- strncpy(buf, DEVICE_DIR, PATH_MAX);
+ strncpy(buf, "/dev", PATH_MAX);
buf[PATH_MAX] = '\0';
/* First try low level device */
return result;
/* If it is dm, try DM dir */
- if (dm_is_dm_device(major)) {
+ if (dm_is_dm_device(major, minor)) {
strncpy(buf, dm_get_dir(), PATH_MAX);
if ((result = __lookup_dev(buf, dev, 0, 0)))
return result;
}
- strncpy(buf, DEVICE_DIR, PATH_MAX);
- result = __lookup_dev(buf, dev, 0, 4);
-
- /* If not found, return NULL */
- return result;
+ strncpy(buf, "/dev", PATH_MAX);
+ return __lookup_dev(buf, dev, 0, 4);
}
+/*
+ * Returns string pointing to device in /dev according to "major:minor" dev_id
+ */
char *crypt_lookup_dev(const char *dev_id)
{
- char link[PATH_MAX], path[PATH_MAX], *devname;
+ int major, minor;
+ char link[PATH_MAX], path[PATH_MAX], *devname, *devpath = NULL;
struct stat st;
ssize_t len;
+ if (sscanf(dev_id, "%d:%d", &major, &minor) != 2)
+ return NULL;
+
if (snprintf(path, sizeof(path), "/sys/dev/block/%s", dev_id) < 0)
return NULL;
- len = readlink(path, link, sizeof(link));
+ len = readlink(path, link, sizeof(link) - 1);
if (len < 0) {
+ /* Without /sys use old scan */
if (stat("/sys/dev/block", &st) < 0)
- return lookup_dev_old(dev_id);
+ return lookup_dev_old(major, minor);
return NULL;
}
return NULL;
devname++;
- if (!strncmp(devname, "dm-", 3))
- return dm_device_path(dev_id);
+ if (dm_is_dm_kernel_name(devname))
+ devpath = dm_device_path("/dev/mapper/", major, minor);
+ else if (snprintf(path, sizeof(path), "/dev/%s", devname) > 0)
+ devpath = strdup(path);
+
+ /*
+ * Check that path is correct.
+ */
+ if (devpath && ((stat(devpath, &st) < 0) ||
+ !S_ISBLK(st.st_mode) ||
+ (st.st_rdev != makedev(major, minor)))) {
+ free(devpath);
+ /* Should never happen unless user mangles with dev nodes. */
+ return lookup_dev_old(major, minor);
+ }
+
+ return devpath;
+}
+
+static int _read_uint64(const char *sysfs_path, uint64_t *value)
+{
+ char tmp[64] = {0};
+ int fd, r;
+
+ if ((fd = open(sysfs_path, O_RDONLY)) < 0)
+ return 0;
+ r = read(fd, tmp, sizeof(tmp));
+ close(fd);
+
+ if (r <= 0)
+ return 0;
+
+ if (sscanf(tmp, "%" PRIu64, value) != 1)
+ return 0;
+
+ return 1;
+}
+
+static int _sysfs_get_uint64(int major, int minor, uint64_t *value, const char *attr)
+{
+ char path[PATH_MAX];
+
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/%s",
+ major, minor, attr) < 0)
+ return 0;
+
+ return _read_uint64(path, value);
+}
+
+static int _path_get_uint64(const char *sysfs_path, uint64_t *value, const char *attr)
+{
+ char path[PATH_MAX];
+
+ if (snprintf(path, sizeof(path), "%s/%s",
+ sysfs_path, attr) < 0)
+ return 0;
+
+ return _read_uint64(path, value);
+}
+
+int crypt_dev_is_rotational(int major, int minor)
+{
+ uint64_t val;
+
+ if (!_sysfs_get_uint64(major, minor, &val, "queue/rotational"))
+ return 1; /* if failed, expect rotational disk */
+
+ return val ? 1 : 0;
+}
+
+int crypt_dev_is_partition(const char *dev_path)
+{
+ uint64_t val;
+ struct stat st;
+
+ if (stat(dev_path, &st) < 0)
+ return 0;
+
+ if (!S_ISBLK(st.st_mode))
+ return 0;
+
+ if (!_sysfs_get_uint64(major(st.st_rdev), minor(st.st_rdev),
+ &val, "partition"))
+ return 0;
+
+ return val ? 1 : 0;
+}
+
+uint64_t crypt_dev_partition_offset(const char *dev_path)
+{
+ uint64_t val;
+ struct stat st;
+
+ if (!crypt_dev_is_partition(dev_path))
+ return 0;
+
+ if (stat(dev_path, &st) < 0)
+ return 0;
+
+ if (!_sysfs_get_uint64(major(st.st_rdev), minor(st.st_rdev),
+ &val, "start"))
+ return 0;
+
+ return val;
+}
+
+/* Try to find partition which match offset and size on top level device */
+char *crypt_get_partition_device(const char *dev_path, uint64_t offset, uint64_t size)
+{
+ char link[PATH_MAX], path[PATH_MAX], part_path[PATH_MAX], *devname;
+ char *result = NULL;
+ struct stat st;
+ size_t devname_len;
+ ssize_t len;
+ struct dirent *entry;
+ DIR *dir;
+ uint64_t part_offset, part_size;
+
+ if (stat(dev_path, &st) < 0)
+ return NULL;
+
+ if (!S_ISBLK(st.st_mode))
+ return NULL;
+
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d",
+ major(st.st_rdev), minor(st.st_rdev)) < 0)
+ return NULL;
+
+ len = readlink(path, link, sizeof(link) - 1);
+ if (len < 0)
+ return NULL;
+
+ /* Get top level disk name for sysfs search */
+ link[len] = '\0';
+ devname = strrchr(link, '/');
+ if (!devname)
+ return NULL;
+ devname++;
+
+ /* DM devices do not use kernel partitions. */
+ if (dm_is_dm_kernel_name(devname))
+ return NULL;
+
+ dir = opendir(path);
+ if (!dir)
+ return NULL;
+
+ devname_len = strlen(devname);
+ while((entry = readdir(dir))) {
+ if (strncmp(entry->d_name, devname, devname_len))
+ continue;
+
+ if (snprintf(part_path, sizeof(part_path), "%s/%s",
+ path, entry->d_name) < 0)
+ continue;
+
+ if (stat(part_path, &st) < 0)
+ continue;
+
+ if (S_ISDIR(st.st_mode)) {
+ if (!_path_get_uint64(part_path, &part_offset, "start") ||
+ !_path_get_uint64(part_path, &part_size, "size"))
+ continue;
+ if (part_offset == offset && part_size == size &&
+ snprintf(part_path, sizeof(part_path), "/dev/%s",
+ entry->d_name) > 0) {
+ result = strdup(part_path);
+ break;
+ }
+ }
+ }
+ closedir(dir);
+
+ return result;
+}
+
+/* Try to find base device from partition */
+char *crypt_get_base_device(const char *dev_path)
+{
+ char link[PATH_MAX], path[PATH_MAX], part_path[PATH_MAX], *devname;
+ struct stat st;
+ ssize_t len;
+
+ if (!crypt_dev_is_partition(dev_path))
+ return NULL;
+
+ if (stat(dev_path, &st) < 0)
+ return NULL;
+
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d",
+ major(st.st_rdev), minor(st.st_rdev)) < 0)
+ return NULL;
+
+ len = readlink(path, link, sizeof(link) - 1);
+ if (len < 0)
+ return NULL;
+
+ /* Get top level disk name for sysfs search */
+ link[len] = '\0';
+ devname = strrchr(link, '/');
+ if (!devname)
+ return NULL;
+ *devname = '\0';
+ devname = strrchr(link, '/');
+ if (!devname)
+ return NULL;
+ devname++;
- if (snprintf(path, sizeof(path), "/dev/%s", devname) < 0)
+ if (dm_is_dm_kernel_name(devname))
return NULL;
- return strdup(path);
+ snprintf(part_path, sizeof(part_path), "/dev/%s", devname);
+ return strdup(part_path);
}
projects / platform / upstream / cryptsetup.git / blobdiff