[PATCH] md 21 of 22 - Improve handling of MD super blocks
1/ don't free the rdev->sb on an error -- it might be accessed again later. Just wait for the device to be exported. 2/ Change md_update_sb to __md_update_sb and have it clear the sb_dirty flag. New md_update_sb locks the device and calls __md_update_sb if sb_dirty. This avoids any possbile races around updating the superblock
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