md: Fix unfortunate interaction with evms

evms configures md arrays by:
  open device
  send ioctl
  close device

for each different ioctl needed.
Since 2.6.29, the device can disappear after the 'close'
unless a significant configuration has happened to the device.
The change made by "SET_ARRAY_INFO" can too minor to stop the device
from disappearing, but important enough that losing the change is bad.

So: make sure SET_ARRAY_INFO sets mddev->ctime, and keep the device
active as long as ctime is non-zero (it gets zeroed with lots of other
things when the array is stopped).

This is suitable for -stable kernels since 2.6.29.

Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@kernel.org

diff --git a/drivers/md/md.c b/drivers/md/md.c
index f4f5f82..7862231 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -386,7 +386,9 @@ static void mddev_put(mddev_t *mddev)
        if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
                return;
        if (!mddev->raid_disks && list_empty(&mddev->disks) &&
-           !mddev->hold_active) {
+           mddev->ctime == 0 && !mddev->hold_active) {
+               /* Array is not configured at all, and not held active,
+                * so destroy it */
                list_del(&mddev->all_mddevs);
                if (mddev->gendisk) {
                        /* we did a probe so need to clean up.
@@ -5262,6 +5264,10 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
                mddev->minor_version = info->minor_version;
                mddev->patch_version = info->patch_version;
                mddev->persistent = !info->not_persistent;
+               /* ensure mddev_put doesn't delete this now that there
+                * is some minimal configuration.
+                */
+               mddev->ctime         = get_seconds();
                return 0;
        }
        mddev->major_version = MD_MAJOR_VERSION;