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From 00ee9938c9c2333dc445b44e475974a3d3e37c10 Mon Sep 17 00:00:00 2001
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From: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
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Date: Tue, 29 Mar 2022 12:49:54 +0200
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Subject: [PATCH] shutdown: get only active md arrays.
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Current md_list_get() implementation filters all block devices, started from
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"md*". This is ambiguous because list could contain:
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- partitions created upon md device (mdXpY)
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- external metadata container- specific type of md array.
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For partitions there is no issue, because they aren't handle STOP_ARRAY
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ioctl sent later. It generates misleading errors only.
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Second case is more problematic because containers are not locked in kernel.
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They are stopped even if container member array is active. For that reason
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reboot or shutdown flow could be blocked because metadata manager cannot be
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restarted after switch root on shutdown.
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Add filters to remove partitions and containers from md_list. Partitions
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can be excluded by DEVTYPE. Containers are determined by MD_LEVEL
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property, we are excluding all with "container" value.
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Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
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(cherry picked from commit 3a3b022d2cc112803ea7b9beea98bbcad110368a)
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Resolves: #2047682
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---
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src/shutdown/umount.c | 18 +++++++++++++++++-
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1 file changed, 17 insertions(+), 1 deletion(-)
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diff --git a/src/shutdown/umount.c b/src/shutdown/umount.c
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index f5a2cb20c1..6b08d9de74 100644
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--- a/src/shutdown/umount.c
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+++ b/src/shutdown/umount.c
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@@ -352,9 +352,14 @@ static int md_list_get(MountPoint **head) {
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if (r < 0)
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return r;
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+ /* Filter out partitions. */
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+ r = sd_device_enumerator_add_match_property(e, "DEVTYPE", "disk");
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+ if (r < 0)
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+ return r;
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+
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FOREACH_DEVICE(e, d) {
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_cleanup_free_ char *p = NULL;
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- const char *dn;
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+ const char *dn, *md_level;
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MountPoint *m;
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dev_t devnum;
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@@ -362,6 +367,17 @@ static int md_list_get(MountPoint **head) {
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sd_device_get_devname(d, &dn) < 0)
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continue;
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+ r = sd_device_get_property_value(d, "MD_LEVEL", &md_level);
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+ if (r < 0) {
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+ log_warning_errno(r, "Failed to get MD_LEVEL property for %s, ignoring: %m", dn);
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+ continue;
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+ }
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+
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+ /* MD "containers" are a special type of MD devices, used for external metadata.
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+ * Since it doesn't provide RAID functionality in itself we don't need to stop it. */
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+ if (streq(md_level, "container"))
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+ continue;
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+
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p = strdup(dn);
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if (!p)
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return -ENOMEM;
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