Imported Upstream version 1.6.7

[platform/upstream/cryptsetup.git] / lib / utils_devpath.c

diff --git a/lib/utils_devpath.c b/lib/utils_devpath.c
index 7007f18..963785a 100644 (file)
--- a/lib/utils_devpath.c
+++ b/lib/utils_devpath.c
@@ -1,7 +1,7 @@
 /*
  * 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) 2009-2012, Red Hat, Inc. All rights reserved.
  * Copyright (C) 2009-2013, Milan Broz
@@ -31,10 +31,7 @@
 #include <limits.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include "utils_dm.h"
-
-char *crypt_lookup_dev(const char *dev_id);
-int crypt_sysfs_get_rotational(int major, int minor, int *rotational);
+#include "internal.h"
 
 static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
 {
@@ -239,6 +236,24 @@ int crypt_dev_is_partition(const char *dev_path)
        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)
 {
@@ -308,3 +323,42 @@ char *crypt_get_partition_device(const char *dev_path, uint64_t offset, uint64_t
 
        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 (dm_is_dm_kernel_name(devname))
+               return NULL;
+
+       snprintf(part_path, sizeof(part_path), "/dev/%s", devname);
+       return strdup(part_path);
+}