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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
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1 changed files with 7 additions and 1 deletions
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@ -386,7 +386,9 @@ static void mddev_put(mddev_t *mddev)
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if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
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return;
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if (!mddev->raid_disks && list_empty(&mddev->disks) &&
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!mddev->hold_active) {
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mddev->ctime == 0 && !mddev->hold_active) {
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/* Array is not configured at all, and not held active,
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* so destroy it */
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list_del(&mddev->all_mddevs);
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if (mddev->gendisk) {
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/* we did a probe so need to clean up.
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@ -5262,6 +5264,10 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
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mddev->minor_version = info->minor_version;
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mddev->patch_version = info->patch_version;
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mddev->persistent = !info->not_persistent;
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/* ensure mddev_put doesn't delete this now that there
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* is some minimal configuration.
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*/
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mddev->ctime = get_seconds();
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return 0;
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}
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mddev->major_version = MD_MAJOR_VERSION;
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