man: document db_persist udev rules OPTION

Fixes #1551
2019-01-22 08:20:09 +01:00
parent 61a38e0265
commit 07d16cc098
1 changed files with 12 additions and 0 deletions
@@ -566,6 +566,18 @@
                  <para>Disable the watching of a device node with inotify.</para>
                </listitem>
              </varlistentry>
+              <varlistentry>
+                <term><option>db_persist</option></term>
+                <listitem>
+                  <para>Set the flag (sticky bit) on the udev database entry
+                  of the event device. Device properties are then kept in the
+                  database even when
+                  <command>udevadm info --cleanup-db</command> is called.
+                  This option can be useful in certain cases
+                  (e.g. Device Mapper devices) for persisting device state
+                  on the transition from initramfs.</para>
+                </listitem>
+              </varlistentry>
            </variablelist>
          </listitem>
        </varlistentry>