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authorNeilBrown <neilb@suse.de>2008-10-13 11:55:11 +1100
committerNeilBrown <neilb@suse.de>2008-10-13 11:55:11 +1100
commitea43ddd8491feccf36267349748ea91b1194481e (patch)
tree89ca77c1f9794994eefa16b76f985b502326cfcd /drivers/md
parent7d3c6f8717ee6c2bf6cba5fa0bda3b28fbda6015 (diff)
downloadop-kernel-dev-ea43ddd8491feccf36267349748ea91b1194481e.zip
op-kernel-dev-ea43ddd8491feccf36267349748ea91b1194481e.tar.gz
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>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7d8c2bb..13dd7b2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -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")) {
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