Commit ea43ddd8 authored Oct 13, 2008 by NeilBrown

md: Allow metadata_version to be updated for externally managed metadata.



For externally managed metadata, the 'metadata_version' sysfs
attribute is really just a channel for user-space programs to
communicate about how the array is being managed.
It can be useful for this to be changed while the array is active.

Normally changes to metadata_version are not permitted while the array
is active.  Change that so that if the metadata is externally managed,
the metadata_version can be changed to a different flavour of external
management.

Signed-off-by: NeilBrown <neilb@suse.de>

parent 7d3c6f87

drivers/md/md.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -2943,7 +2943,13 @@ metadata_store(mddev_t mddev, const char buf, size_t len)
		{
		int major, minor;
		char *e;
		if (!list_empty(&mddev->disks))
		/* Changing the details of 'external' metadata is
		* always permitted. Otherwise there must be
		* no devices attached to the array.
		*/
		if (mddev->external && strncmp(buf, "external:", 9) == 0)
		;
		else if (!list_empty(&mddev->disks))
		return -EBUSY;

		if (cmd_match(buf, "none")) {