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| author | NeilBrown <neilb@suse.de> | 2008-10-13 02:55:11 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2008-10-13 02:55:11 +0200 |
| commit | ea43ddd8491feccf36267349748ea91b1194481e (patch) | |
| tree | 89ca77c1f9794994eefa16b76f985b502326cfcd | |
| parent | md: Fix rdev_size_store with size == 0 (diff) | |
| download | linux-ea43ddd8491feccf36267349748ea91b1194481e.tar.xz linux-ea43ddd8491feccf36267349748ea91b1194481e.zip | |
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>
| -rw-r--r-- | drivers/md/md.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 7d8c2bb0a67c..13dd7b276150 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")) { |