[Dovecot] How to get rid of locks

Timo Sirainen tss at iki.fi
Sun Apr 8 12:54:20 EEST 2007

On 8.4.2007, at 12.41, Miquel van Smoorenburg wrote:

> On Sat, 2007-04-07 at 22:30 +0300, Timo Sirainen wrote:
>> Although Dovecot is already read-lockless and it uses only short-
>> lived write locks, it's be really nice to just get rid of the locking
>> completely. :)
>> I just figured out that O_APPEND is pretty great. If the operating
>> system updates seek position after writing to a file opened with
>> O_APPEND, writes to Dovecot's transaction log file can be made
>> lockless.
> Doest his mean there's even less chance of indexes working on NFS  
> (where
> O_APPEND doesn't really work) ?

No. I haven't forgotten NFS users. You missed this part:

> The O_APPEND at least doesn't work with NFS, so it'll have to be  
> optional anyway.

I'm now trying to think of ways to simplify the index file handling.  
That allows me to then implement NFS workarounds more easily, such as  
forcing attribute cache flushing when it's needed.
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