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Tiny spacing nit.
Fix a typo, pointed out by miod@.
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and worked members. nad_worked becomes NFSAIOD_WAKEUP, which is set after if
an aiod was removed from the idle list and woken up by nfs_asyncio().
don't rely on tsleep wchans being unique, that is keep going back to sleep if
woken up unless the NFSAIOD_WAKEUP flag is set.
fix a divide by zero crash if nfs.vfs.iothreads is set to 0, as that can happen
when we recalculate the maximum buf's to queue up for each aiod.
in nfs_asyncio() set the nad_mnt to NULL before returning the aiod back to the
idle list in the case where we have already queued up to many bufs, otherwise
we trip an assertion.
minimize the time we are holding the nfs_aiodl_mtx to only when we are inserting
or removing from the lists, with the exception of nfs_set_naiod() as it would
make the loops more complicated and its uncommon in any case.
tested by myself and deraadt@
"fine with me" deraadt@
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before inserting it back into the list.
crashes debugged with help from deraadt@ who also tested this fix.
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each mount, and when work is "found", peg an aiod to that mount todo the
I/O. Make nfs_asyncio() a bit smarter when deciding when to do asyncio
and when to force it sync, this is done by keeping the aiod's one two lists,
an "idle" and an "all" list, so asyncio is only done when there are aiods
hanging around todo it for us or are already pegged to the mount.
Idea liked by at least beck@ (and I think art@).
Extensive testing done by myself and jasper and a few others on various
arch's.
Ideas/Code from Net/Free.
OK blambert@.
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