--- /dev/null
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+//#include <sys/stat.h>
+//#include <sys/statfs.h>
+
+//#include "alloc-util.h"
+//#include "blockdev-util.h"
+//#include "btrfs-util.h"
+//#include "dirent-util.h"
+//#include "fd-util.h"
+//#include "fileio.h"
+//#include "missing.h"
+//#include "stat-util.h"
+
+int block_get_whole_disk(dev_t d, dev_t *ret) {
+ char p[SYS_BLOCK_PATH_MAX("/partition")];
+ _cleanup_free_ char *s = NULL;
+ unsigned n, m;
+ int r;
+
+ assert(ret);
+
+ /* If it has a queue this is good enough for us */
+ xsprintf_sys_block_path(p, "/queue", d);
+ if (access(p, F_OK) >= 0) {
+ *ret = d;
+ return 0;
+ }
+
+ /* If it is a partition find the originating device */
+ xsprintf_sys_block_path(p, "/partition", d);
+ if (access(p, F_OK) < 0)
+ return -ENOENT;
+
+ /* Get parent dev_t */
+ xsprintf_sys_block_path(p, "/../dev", d);
+ r = read_one_line_file(p, &s);
+ if (r < 0)
+ return r;
+
+ r = sscanf(s, "%u:%u", &m, &n);
+ if (r != 2)
+ return -EINVAL;
+
+ /* Only return this if it is really good enough for us. */
+ xsprintf_sys_block_path(p, "/queue", makedev(m, n));
+ if (access(p, F_OK) < 0)
+ return -ENOENT;
+
+ *ret = makedev(m, n);
+ return 0;
+}
+
+int get_block_device(const char *path, dev_t *dev) {
+ struct stat st;
+ struct statfs sfs;
+
+ assert(path);
+ assert(dev);
+
+ /* Get's the block device directly backing a file system. If
+ * the block device is encrypted, returns the device mapper
+ * block device. */
+
+ if (lstat(path, &st))
+ return -errno;
+
+ if (major(st.st_dev) != 0) {
+ *dev = st.st_dev;
+ return 1;
+ }
+
+ if (statfs(path, &sfs) < 0)
+ return -errno;
+
+ if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
+ return btrfs_get_block_device(path, dev);
+
+ return 0;
+}
+
+int get_block_device_harder(const char *path, dev_t *dev) {
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_free_ char *t = NULL;
+ char p[SYS_BLOCK_PATH_MAX("/slaves")];
+ struct dirent *de, *found = NULL;
+ const char *q;
+ unsigned maj, min;
+ dev_t dt;
+ int r;
+
+ assert(path);
+ assert(dev);
+
+ /* Gets the backing block device for a file system, and
+ * handles LUKS encrypted file systems, looking for its
+ * immediate parent, if there is one. */
+
+ r = get_block_device(path, &dt);
+ if (r <= 0)
+ return r;
+
+ xsprintf_sys_block_path(p, "/slaves", dt);
+ d = opendir(p);
+ if (!d) {
+ if (errno == ENOENT)
+ goto fallback;
+
+ return -errno;
+ }
+
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
+
+ if (dot_or_dot_dot(de->d_name))
+ continue;
+
+ if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN))
+ continue;
+
+ if (found) {
+ _cleanup_free_ char *u = NULL, *v = NULL, *a = NULL, *b = NULL;
+
+ /* We found a device backed by multiple other devices. We don't really support automatic
+ * discovery on such setups, with the exception of dm-verity partitions. In this case there are
+ * two backing devices: the data partition and the hash partition. We are fine with such
+ * setups, however, only if both partitions are on the same physical device. Hence, let's
+ * verify this. */
+
+ u = strjoin(p, "/", de->d_name, "/../dev");
+ if (!u)
+ return -ENOMEM;
+
+ v = strjoin(p, "/", found->d_name, "/../dev");
+ if (!v)
+ return -ENOMEM;
+
+ r = read_one_line_file(u, &a);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to read %s: %m", u);
+ goto fallback;
+ }
+
+ r = read_one_line_file(v, &b);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to read %s: %m", v);
+ goto fallback;
+ }
+
+ /* Check if the parent device is the same. If not, then the two backing devices are on
+ * different physical devices, and we don't support that. */
+ if (!streq(a, b))
+ goto fallback;
+ }
+
+ found = de;
+ }
+
+ if (!found)
+ goto fallback;
+
+ q = strjoina(p, "/", found->d_name, "/dev");
+
+ r = read_one_line_file(q, &t);
+ if (r == -ENOENT)
+ goto fallback;
+ if (r < 0)
+ return r;
+
+ if (sscanf(t, "%u:%u", &maj, &min) != 2)
+ return -EINVAL;
+
+ if (maj == 0)
+ goto fallback;
+
+ *dev = makedev(maj, min);
+ return 1;
+
+fallback:
+ *dev = dt;
+ return 1;
+}
}
#if 0 /// UNNEEDED by elogind
-int block_get_whole_disk(dev_t d, dev_t *ret) {
- char p[SYS_BLOCK_PATH_MAX("/partition")];
- _cleanup_free_ char *s = NULL;
- int r;
- unsigned n, m;
-
- assert(ret);
-
- /* If it has a queue this is good enough for us */
- xsprintf_sys_block_path(p, "/queue", d);
- if (access(p, F_OK) >= 0) {
- *ret = d;
- return 0;
- }
-
- /* If it is a partition find the originating device */
- xsprintf_sys_block_path(p, "/partition", d);
- if (access(p, F_OK) < 0)
- return -ENOENT;
-
- /* Get parent dev_t */
- xsprintf_sys_block_path(p, "/../dev", d);
- r = read_one_line_file(p, &s);
- if (r < 0)
- return r;
-
- r = sscanf(s, "%u:%u", &m, &n);
- if (r != 2)
- return -EINVAL;
-
- /* Only return this if it is really good enough for us. */
- xsprintf_sys_block_path(p, "/queue", makedev(m, n));
- if (access(p, F_OK) < 0)
- return -ENOENT;
-
- *ret = makedev(m, n);
- return 0;
-}
-
bool kexec_loaded(void) {
_cleanup_free_ char *s = NULL;
}
#if 0 /// UNNEEDED by elogind
-int get_block_device(const char *path, dev_t *dev) {
- struct stat st;
- struct statfs sfs;
-
- assert(path);
- assert(dev);
-
- /* Get's the block device directly backing a file system. If
- * the block device is encrypted, returns the device mapper
- * block device. */
-
- if (lstat(path, &st))
- return -errno;
-
- if (major(st.st_dev) != 0) {
- *dev = st.st_dev;
- return 1;
- }
-
- if (statfs(path, &sfs) < 0)
- return -errno;
-
- if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
- return btrfs_get_block_device(path, dev);
-
- return 0;
-}
-
-int get_block_device_harder(const char *path, dev_t *dev) {
- _cleanup_closedir_ DIR *d = NULL;
- _cleanup_free_ char *t = NULL;
- char p[SYS_BLOCK_PATH_MAX("/slaves")];
- struct dirent *de, *found = NULL;
- const char *q;
- unsigned maj, min;
- dev_t dt;
- int r;
-
- assert(path);
- assert(dev);
-
- /* Gets the backing block device for a file system, and
- * handles LUKS encrypted file systems, looking for its
- * immediate parent, if there is one. */
-
- r = get_block_device(path, &dt);
- if (r <= 0)
- return r;
-
- xsprintf_sys_block_path(p, "/slaves", dt);
- d = opendir(p);
- if (!d) {
- if (errno == ENOENT)
- goto fallback;
-
- return -errno;
- }
-
- FOREACH_DIRENT_ALL(de, d, return -errno) {
-
- if (dot_or_dot_dot(de->d_name))
- continue;
-
- if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN))
- continue;
-
- if (found) {
- _cleanup_free_ char *u = NULL, *v = NULL, *a = NULL, *b = NULL;
-
- /* We found a device backed by multiple other devices. We don't really support automatic
- * discovery on such setups, with the exception of dm-verity partitions. In this case there are
- * two backing devices: the data partition and the hash partition. We are fine with such
- * setups, however, only if both partitions are on the same physical device. Hence, let's
- * verify this. */
-
- u = strjoin(p, "/", de->d_name, "/../dev");
- if (!u)
- return -ENOMEM;
-
- v = strjoin(p, "/", found->d_name, "/../dev");
- if (!v)
- return -ENOMEM;
-
- r = read_one_line_file(u, &a);
- if (r < 0) {
- log_debug_errno(r, "Failed to read %s: %m", u);
- goto fallback;
- }
-
- r = read_one_line_file(v, &b);
- if (r < 0) {
- log_debug_errno(r, "Failed to read %s: %m", v);
- goto fallback;
- }
-
- /* Check if the parent device is the same. If not, then the two backing devices are on
- * different physical devices, and we don't support that. */
- if (!streq(a, b))
- goto fallback;
- }
-
- found = de;
- }
-
- if (!found)
- goto fallback;
-
- q = strjoina(p, "/", found->d_name, "/dev");
-
- r = read_one_line_file(q, &t);
- if (r == -ENOENT)
- goto fallback;
- if (r < 0)
- return r;
-
- if (sscanf(t, "%u:%u", &maj, &min) != 2)
- return -EINVAL;
-
- if (maj == 0)
- goto fallback;
-
- *dev = makedev(maj, min);
- return 1;
-
-fallback:
- *dev = dt;
- return 1;
-}
#endif // 0
~ianmdlvl / elogind.git / commitdiff