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    Subject[patch 42/56] md: Allow metadata_version to be updated for externally managed metadata.
    2.6.27-stable review patch.  If anyone has any objections, please let us know.

    From: NeilBrown <>

    commit ea43ddd8491feccf36267349748ea91b1194481e upstream.

    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

    Signed-off-by: NeilBrown <>
    Signed-off-by: Greg Kroah-Hartman <>

    drivers/md/md.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    --- a/drivers/md/md.c
    +++ b/drivers/md/md.c
    @@ -2960,7 +2960,13 @@ metadata_store(mddev_t *mddev, const cha
    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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