Re: [PATCH 008 of 8] md/bitmap: Change md/bitmap file handling touse bmap to file blocks.

[Andrew Morton]

Paul Clements <paul.clements@xxxxxxxxxxxx> wrote:
>
> Andrew Morton wrote:
> 
> > The loss of pagecache coherency seems sad.  I assume there's never a
> > requirement for userspace to read this file.
> 
> Actually, there is. mdadm reads the bitmap file, so that would be 
> broken. Also, it's just useful for a user to be able to read the bitmap 
> (od -x, or similar) to figure out approximately how much more he's got 
> to resync to get an array in-sync. Other than reading the bitmap file, I 
> don't know of any way to determine that.

Read it with O_DIRECT :(
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