*
* 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.
+ * 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
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
+#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_check_crypt_segment(const char *device, uint64_t offset, uint64_t size);
-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)
{
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 devpath;
}
-static int crypt_sysfs_get_major_minor(const char *kname, int *major, int *minor)
+static int _read_uint64(const char *sysfs_path, uint64_t *value)
{
- char path[PATH_MAX], tmp[64] = {0};
- int fd, r = 0;
-
- if (snprintf(path, sizeof(path), "/sys/block/%s/dev", kname) < 0)
- return 0;
+ char tmp[64] = {0};
+ int fd, r;
- 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;
- tmp[63] = '\0';
- if (sscanf(tmp, "%d:%d", major, minor) != 2)
+ if (sscanf(tmp, "%" PRIu64, value) != 1)
return 0;
return 1;
}
-static int crypt_sysfs_get_holders_dir(const char *device, char *path, int size)
+static int _sysfs_get_uint64(int major, int minor, uint64_t *value, const char *attr)
{
- struct stat st;
+ char path[PATH_MAX];
- if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/%s",
+ major, minor, attr) < 0)
return 0;
- if (snprintf(path, size, "/sys/dev/block/%d:%d/holders",
- major(st.st_rdev), minor(st.st_rdev)) < 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 1;
+ return _read_uint64(path, value);
}
-int crypt_sysfs_check_crypt_segment(const char *device, uint64_t offset, uint64_t size)
+int crypt_dev_is_rotational(int major, int minor)
{
- DIR *dir;
- struct dirent *d;
- char path[PATH_MAX], *dmname;
- int major, minor, r = 0;
+ uint64_t val;
- if (!crypt_sysfs_get_holders_dir(device, path, sizeof(path)))
- return -EINVAL;
+ if (!_sysfs_get_uint64(major, minor, &val, "queue/rotational"))
+ return 1; /* if failed, expect rotational disk */
- if (!(dir = opendir(path)))
- return -EINVAL;
+ return val ? 1 : 0;
+}
- while (!r && (d = readdir(dir))) {
- if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
- continue;
+int crypt_dev_is_partition(const char *dev_path)
+{
+ uint64_t val;
+ struct stat st;
- if (!dm_is_dm_kernel_name(d->d_name)) {
- r = -EBUSY;
- break;
- }
+ if (stat(dev_path, &st) < 0)
+ return 0;
- if (!crypt_sysfs_get_major_minor(d->d_name, &major, &minor)) {
- r = -EINVAL;
- break;
- }
+ if (!S_ISBLK(st.st_mode))
+ return 0;
- if (!(dmname = dm_device_path(NULL, major, minor))) {
- r = -EINVAL;
- break;
- }
- r = dm_check_segment(dmname, offset, size);
- free(dmname);
- }
- closedir(dir);
+ if (!_sysfs_get_uint64(major(st.st_rdev), minor(st.st_rdev),
+ &val, "partition"))
+ return 0;
- return r;
+ return val ? 1 : 0;
}
-int crypt_sysfs_get_rotational(int major, int minor, int *rotational)
+/* 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 path[PATH_MAX], tmp[64] = {0};
- int fd, r;
+ 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 (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/queue/rotational",
- major, minor) < 0)
- return 0;
+ if (stat(dev_path, &st) < 0)
+ return NULL;
- if ((fd = open(path, O_RDONLY)) < 0)
- return 0;
- r = read(fd, tmp, sizeof(tmp));
- close(fd);
+ if (!S_ISBLK(st.st_mode))
+ return NULL;
- if (r <= 0)
- return 0;
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d",
+ major(st.st_rdev), minor(st.st_rdev)) < 0)
+ return NULL;
- if (sscanf(tmp, "%d", rotational) != 1)
- return 0;
+ len = readlink(path, link, sizeof(link) - 1);
+ if (len < 0)
+ return NULL;
- return 1;
+ /* 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;
}
projects / platform / upstream / cryptsetup.git / blobdiff