On Wed, 30 Nov 2011 23:34:13 -0700 Marcus Sorensen <shadowsor@xxxxxxxxx> wrote: > I would appreciate being pointed to any sort of in-depth documentation > on how the write intent bitmap works. To make my question quick, I'm > wondering how the write-intent bitmap holds up to writeback caching. > It seems like md would assume that the cached writes had made it to > disk, and only rebuild writes that happened since the disk was > removed, leaving an inconsistent array. > md writes bitmaps with REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA If that returns before the data is truly safe, then you have a bug somewhere. i.e. md tries to write-through an cache that might be in the way. NeilBrown
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