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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Enable custom path to be ignored on shutdown umount cycle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=56837">56837</a>
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<th>Assignee</th>
<td>systemd-bugs@lists.freedesktop.org
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<th>Summary</th>
<td>Enable custom path to be ignored on shutdown umount cycle
</td>
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<th>QA Contact</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Reporter</th>
<td>aleksei.lissitsin@gmail.com
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Component</th>
<td>general
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<th>Product</th>
<td>systemd
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<p>
<div>
<pre>In systemd it should be possible to specify which mountpoints must not be
unmounted on shutdown.
I have the following setup:
Archlinux (guest) is installed into a file on an ntfs partition (host).
Initrd mounts the host (say, /dev/sda2) into its (initrd's) filesystem using
an executable whose name starts with @ (so that the process would not be killed
by systemd on shutdown).
Then initrd creates a loop device using the file on the host and proceeds to
start the guest using it as the root device.
But I still want to access the host from the guest, so initrd bind-mounts
the host to a path in guest's filesystem (I cannot mount it later from guest
because /dev/sda2 would be busy as already mounted).
This causes /dev/sda2 to appear in guest's mountinfo, so that systemd will try
(and succeed) to unmount it while there are still some processes writing to
guest's filesystem. --> BAD THINGS HAPPEN THEN
I currently solve the issue by the following patch
(my host is mounted to /host in guest filesystem)
--- a/src/core/mount-setup.c
+++ b/src/core/mount-setup.c
@@ -127,7 +127,7 @@ bool mount_point_ignore(const char *path) {
if (path_equal(path, i))
return true;
- return false;
+ return path_startswith(path, "/host");
}
static int mount_one(const MountPoint *p, bool relabel) {
But I think that using predefined prefixes is not the best solution and systemd
should allow one to somehow specify exactly which mountpoints not to unmount on
shutdown.</pre>
</div>
</p>
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