Re: [PATCH md 0 of 4] Introduction

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NeilBrown <neilb@xxxxxxxxxxxxxxx> wrote:
> The second two fix bugs that were introduced by the recent 
> bitmap-based-intent-logging patches and so are not relevant

Neil - can you describe for me (us all?) what is meant by
intent­logging here.

Well, I can guess - I suppose the driver marks the bitmap before a write
(or group of writes) and unmarks it when they have completed
successfully.  Is that it?

If so, how does it manage to mark what it is _going_ to do (without
psychic powers) on the disk bitmap?  Unmarking is easy - that needs a
queue of things due to be unmarked in the bitmap, and a point in time at
which they are all unmarked at once on disk.

Then resync would only deal with the marked blocks.

Peter

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