*
* Copyright (C) 2004, Christophe Saout <christophe@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.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
*
* 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 <stdlib.h>
#include <unistd.h>
#include <dirent.h>
+#include <fcntl.h>
+#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "utils_dm.h"
+char *crypt_lookup_dev(const char *dev_id);
+int crypt_sysfs_check_crypt_segment(const char *device, uint64_t offset, uint64_t size);
+int crypt_sysfs_get_rotational(int major, int minor, int *rotational);
+
static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
{
struct dirent *entry;
devname++;
if (dm_is_dm_kernel_name(devname))
- devpath = dm_device_path(major, minor);
+ devpath = dm_device_path("/dev/mapper/", major, minor);
else if (snprintf(path, sizeof(path), "/dev/%s", devname) > 0)
devpath = strdup(path);
return devpath;
}
+
+static int crypt_sysfs_get_major_minor(const char *kname, int *major, int *minor)
+{
+ char path[PATH_MAX], tmp[64] = {0};
+ int fd, r = 0;
+
+ if (snprintf(path, sizeof(path), "/sys/block/%s/dev", kname) < 0)
+ return 0;
+
+ if ((fd = open(path, O_RDONLY)) < 0)
+ return 0;
+ r = read(fd, tmp, sizeof(tmp));
+ close(fd);
+
+ if (r <= 0)
+ return 0;
+
+ tmp[63] = '\0';
+ if (sscanf(tmp, "%d:%d", major, minor) != 2)
+ return 0;
+
+ return 1;
+}
+
+static int crypt_sysfs_get_holders_dir(const char *device, char *path, int size)
+{
+ struct stat st;
+
+ if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
+ return 0;
+
+ if (snprintf(path, size, "/sys/dev/block/%d:%d/holders",
+ major(st.st_rdev), minor(st.st_rdev)) < 0)
+ return 0;
+
+ return 1;
+}
+
+int crypt_sysfs_check_crypt_segment(const char *device, uint64_t offset, uint64_t size)
+{
+ DIR *dir;
+ struct dirent *d;
+ char path[PATH_MAX], *dmname;
+ int major, minor, r = 0;
+
+ if (!crypt_sysfs_get_holders_dir(device, path, sizeof(path)))
+ return -EINVAL;
+
+ if (!(dir = opendir(path)))
+ return -EINVAL;
+
+ while (!r && (d = readdir(dir))) {
+ if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+ continue;
+
+ if (!dm_is_dm_kernel_name(d->d_name)) {
+ r = -EBUSY;
+ break;
+ }
+
+ if (!crypt_sysfs_get_major_minor(d->d_name, &major, &minor)) {
+ r = -EINVAL;
+ break;
+ }
+
+ if (!(dmname = dm_device_path(NULL, major, minor))) {
+ r = -EINVAL;
+ break;
+ }
+ r = dm_check_segment(dmname, offset, size);
+ free(dmname);
+ }
+ closedir(dir);
+
+ return r;
+}
+
+int crypt_sysfs_get_rotational(int major, int minor, int *rotational)
+{
+ char path[PATH_MAX], tmp[64] = {0};
+ int fd, r;
+
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/queue/rotational",
+ major, minor) < 0)
+ return 0;
+
+ if ((fd = open(path, O_RDONLY)) < 0)
+ return 0;
+ r = read(fd, tmp, sizeof(tmp));
+ close(fd);
+
+ if (r <= 0)
+ return 0;
+
+ if (sscanf(tmp, "%d", rotational) != 1)
+ return 0;
+
+ return 1;
+}