/* SPDX-License-Identifier: LGPL-2.1+ */
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-***/
#include <sys/stat.h>
#include <sys/statfs.h>
#include "fd-util.h"
#include "fileio.h"
#include "missing.h"
+#include "parse-util.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;
+ dev_t devt;
int r;
assert(ret);
if (r < 0)
return r;
- r = sscanf(s, "%u:%u", &m, &n);
- if (r != 2)
- return -EINVAL;
+ r = parse_dev(s, &devt);
+ if (r < 0)
+ return r;
/* Only return this if it is really good enough for us. */
- xsprintf_sys_block_path(p, "/queue", makedev(m, n));
+ xsprintf_sys_block_path(p, "/queue", devt);
if (access(p, F_OK) < 0)
return -ENOENT;
- *ret = makedev(m, n);
+ *ret = devt;
return 0;
}
assert(path);
assert(dev);
- /* Get's the block device directly backing a file system. If
+ /* Gets the block device directly backing a file system. If
* the block device is encrypted, returns the device mapper
* block device. */
if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
return btrfs_get_block_device(path, dev);
+ *dev = 0;
return 0;
}
-int get_block_device_harder(const char *path, dev_t *dev) {
+int block_get_originating(dev_t dt, dev_t *ret) {
_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;
+ dev_t devt;
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;
+ /* For the specified block device tries to chase it through the layers, in case LUKS-style DM stacking is used,
+ * trying to find the next underlying layer. */
xsprintf_sys_block_path(p, "/slaves", dt);
d = opendir(p);
- if (!d) {
- if (errno == ENOENT)
- goto fallback;
-
+ if (!d)
return -errno;
- }
FOREACH_DIRENT_ALL(de, d, return -errno) {
return -ENOMEM;
r = read_one_line_file(u, &a);
- if (r < 0) {
- log_debug_errno(r, "Failed to read %s: %m", u);
- goto fallback;
- }
+ if (r < 0)
+ return log_debug_errno(r, "Failed to read %s: %m", u);
r = read_one_line_file(v, &b);
- if (r < 0) {
- log_debug_errno(r, "Failed to read %s: %m", v);
- goto fallback;
- }
+ if (r < 0)
+ return log_debug_errno(r, "Failed to read %s: %m", v);
/* 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;
+ return -ENOTUNIQ;
}
found = de;
}
if (!found)
- goto fallback;
+ return -ENOENT;
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)
+ r = parse_dev(t, &devt);
+ if (r < 0)
return -EINVAL;
- if (maj == 0)
- goto fallback;
+ if (major(devt) == 0)
+ return -ENOENT;
- *dev = makedev(maj, min);
+ *ret = devt;
return 1;
+}
+
+int get_block_device_harder(const char *path, dev_t *ret) {
+ int r;
+
+ assert(path);
+ assert(ret);
+
+ /* 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, ret);
+ if (r <= 0)
+ return r;
+
+ r = block_get_originating(*ret, ret);
+ if (r < 0)
+ log_debug_errno(r, "Failed to chase block device '%s', ignoring: %m", path);
-fallback:
- *dev = dt;
return 1;
}