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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2010 ProFUSION embedded systems
***/
#include <linux/major.h>
#include <linux/raid/md_u.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "sd-device.h"
#include "alloc-util.h"
#include "blockdev-util.h"
#include "detach-md.h"
#include "device-util.h"
#include "devnum-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "string-util.h"
typedef struct RaidDevice {
char *path;
dev_t devnum;
LIST_FIELDS(struct RaidDevice, raid_device);
} RaidDevice;
static void raid_device_free(RaidDevice **head, RaidDevice *m) {
assert(head);
assert(m);
LIST_REMOVE(raid_device, *head, m);
free(m->path);
free(m);
}
static void raid_device_list_free(RaidDevice **head) {
assert(head);
while (*head)
raid_device_free(head, *head);
}
static int md_list_get(RaidDevice **head) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
int r;
assert(head);
r = sd_device_enumerator_new(&e);
if (r < 0)
return r;
r = sd_device_enumerator_allow_uninitialized(e);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_subsystem(e, "block", true);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_sysname(e, "md*");
if (r < 0)
return r;
/* Filter out partitions. */
r = sd_device_enumerator_add_match_property(e, "DEVTYPE", "disk");
if (r < 0)
return r;
FOREACH_DEVICE(e, d) {
_cleanup_free_ char *p = NULL;
const char *dn, *md_level;
RaidDevice *m;
dev_t devnum;
r = sd_device_get_devname(d, &dn);
if (r < 0) {
log_device_warning_errno(d, r, "Failed to get name of enumerated device, ignoring: %m");
continue;
}
r = sd_device_get_devnum(d, &devnum);
if (r < 0) {
log_device_warning_errno(d, r, "Failed to get devno of enumerated device '%s', ignoring device: %m", dn);
continue;
}
/* MD "containers" are a special type of MD devices, used for external metadata. Since they
* don't provide RAID functionality in themselves we don't need to stop them. Note that the
* MD_LEVEL udev property is set by mdadm in userspace, which is an optional package. Hence
* let's handle gracefully if the property is missing. */
r = sd_device_get_property_value(d, "MD_LEVEL", &md_level);
if (r < 0)
log_device_full_errno(d,
r == -ENOENT ? LOG_DEBUG : LOG_WARNING,
r,
"Failed to get MD_LEVEL property for %s, assuming regular MD device, not a container: %m", dn);
else if (streq(md_level, "container")) {
log_device_debug(d, "Skipping MD device '%s' because it is a container MD device.", dn);
continue;
}
p = strdup(dn);
if (!p)
return -ENOMEM;
m = new(RaidDevice, 1);
if (!m)
return -ENOMEM;
*m = (RaidDevice) {
.path = TAKE_PTR(p),
.devnum = devnum,
};
LIST_PREPEND(raid_device, *head, m);
}
return 0;
}
static int delete_md(RaidDevice *m) {
_cleanup_close_ int fd = -EBADF;
assert(m);
assert(major(m->devnum) != 0);
assert(m->path);
fd = open(m->path, O_RDONLY|O_CLOEXEC|O_EXCL);
if (fd < 0)
return -errno;
if (fsync(fd) < 0)
log_debug_errno(errno, "Failed to sync MD block device %s, ignoring: %m", m->path);
return RET_NERRNO(ioctl(fd, STOP_ARRAY, NULL));
}
static int md_points_list_detach(RaidDevice **head, bool *changed, bool last_try) {
int n_failed = 0, r;
dev_t rootdev = 0, usrdev = 0;
assert(head);
assert(changed);
(void) get_block_device("/", &rootdev);
(void) get_block_device("/usr", &usrdev);
LIST_FOREACH(raid_device, m, *head) {
if ((major(rootdev) != 0 && rootdev == m->devnum) ||
(major(usrdev) != 0 && usrdev == m->devnum)) {
log_debug("Not detaching MD %s that backs the OS itself, skipping.", m->path);
n_failed++;
continue;
}
log_info("Stopping MD %s (" DEVNUM_FORMAT_STR ").", m->path, DEVNUM_FORMAT_VAL(m->devnum));
r = delete_md(m);
if (r < 0) {
log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Could not stop MD %s: %m", m->path);
n_failed++;
continue;
}
*changed = true;
raid_device_free(head, m);
}
return n_failed;
}
int md_detach_all(bool *changed, bool last_try) {
_cleanup_(raid_device_list_free) LIST_HEAD(RaidDevice, md_list_head);
int r;
assert(changed);
LIST_HEAD_INIT(md_list_head);
r = md_list_get(&md_list_head);
if (r < 0)
return r;
return md_points_list_detach(&md_list_head, changed, last_try);
}
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