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Diffstat (limited to '')
| -rw-r--r-- | src/shutdown/detach-md.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/shutdown/detach-md.c b/src/shutdown/detach-md.c new file mode 100644 index 0000000..cf3130d --- /dev/null +++ b/src/shutdown/detach-md.c @@ -0,0 +1,188 @@ +/* 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); +} |