[Dovecot] 1.0-test17 Maildir bug

[Timo Sirainen]

On 19.6.2004, at 20:50, Moe Wibble wrote:

>> Actually it is a syncing problem, but not like the others. It happens
>> when Dovecot tries to update maildir (flags, expunges) but finds out
>> that some file is missing, so it tries to sync the maildir to find it.
>> Except it is already in the middle of syncing index, so it crashes. 
>> Have
>> to think a while what is the right fix for this.
>
> Sounds confusing.
> Shouldn't the index-sync just be delayed if there's one in progress 
> already?
> I imagine something like while ( log->index->log_locked ) usleep(500);.
> After all it's locked, isn't it?

But it's then syncing the index itself, so sleeping wouldn't help :) It 
basically goes like:

  - begin index sync
  - commit each change to maildir
    - maildir files may change their names, so if it's lost, we have to 
find it again:
      - read everything in maildir and store them
      - begin index sync, so we can store the changes in it
        - oops, we're already syncing index, crash
  - finish index sync

Anyway, the fix was pretty simple. Just update the maildir filenames 
and leave the index syncing later.

I'll release test19 sometimes later after some more mbox fixes.
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