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) ? That's a pity, as a lot of larger sites use NFS. They are already forced to use indexes on local disk - and dovecot seems to rely on indexes more and more (fulltext index, shared mailboxes, etc). And mailbox formats like dbox don't even work without an index. I had hoped that the existing index code would be made more reliable and network-filesystem safe first. Mike.
