[Dovecot] Various uidlist and index errors with 1.1 on NFS

[Timo Sirainen]

I'm beginning to understand the problem. Or at least one of them. :)

Dovecot is currently flushing attribute cache for files it wants to
stat/open. But that's not enough. It also has to flush attribute cache
for the directory, or it might stat/open a file that has already been
unlinked (but which still has links somewhere in the filesystem so that
it doesn't fail with ESTALE).

dotlock_use_excl=yes seems to help somewhat with this problem for now.
It also gives better performance.

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