/*
* 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
#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)
{
return devpath;
}
-int crypt_sysfs_get_rotational(int major, int minor, int *rotational)
+static int _read_uint64(const char *sysfs_path, uint64_t *value)
{
- char path[PATH_MAX], tmp[64] = {0};
+ char 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)
+ 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, "%d", rotational) != 1)
+ 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 (dm_is_dm_kernel_name(devname))
+ return NULL;
+
+ snprintf(part_path, sizeof(part_path), "/dev/%s", devname);
+ return strdup(part_path);
+}
projects / platform / upstream / cryptsetup.git / blobdiff