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.
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