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zdev: Add build option to update initial RAM-disk by default

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Some Linux distributions always include a copy of all persistent device
configuration data when updating the initial RAM-disk. This makes
chzdev's persistent device configuration changes ineffective because
device configuration directives applied in the RAM-disk take precedence
over those stored in the root filesystem.

This patch introduces a new build-time switch which allows distributions
to specify that whenever there is a persistent device configuration
change, the RAM-disk is updated automatically.

This feature can be enabled by adding 'ZDEV_ALWAYS_UPDATE_INITRD=1' as
a zdev build option. Where, by default ZDEV_ALWAYS_UPDATE_INITRD is 0.

Co-developed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Vineeth Vijayan
2020-12-10 18:52:27 +01:00
committed by Jan Höppner
parent 663262c962
commit 7dd03eaeec
5 changed files with 95 additions and 15 deletions
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2
zdev/src/chzdev.c
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@@ -3027,7 +3027,7 @@ int main(int argc, char *argv[])
!dryrun) {
/* If the root device/device type or early devices have been
* modified, additional work might be necessary. */
rc = root_check();
rc = initrd_check(ZDEV_ALWAYS_UPDATE_INITRD);
if (rc && !drc)
drc = rc;
}