Re: [fuse-devel] [PATCH 0/6] fuse: process direct IO asynchronously

["Maxim V. Patlasov" <mpatlasov@parallels.com>]

12/13/2012 11:43 PM, Zach Brown пишет:
> (I'm jumping in mid-thread, I don't *really* know the context.)
>
>> In the other words, if it's sync, it's enough to wake up someone in
>> kernel (who called wait_on_sync_kiocb()) and return. Otherwise,
>> aio_complete() performs some steps to wake up user (who called
>> io_getevents()). What we need for fuse is another binary attribute:
>> iocb was generated by libaio vs. read(2)/write(2). Then we could use
>> aio_complete() and wait_on_sync_kiocb() for any iocb which was not
>> generated by libaio. E.g. to process sync dio in async way, we'd
>> allocate iocb in fuse_direct_IO on stack (as you suggested), but
>> initialize it as async iocb and pass it to __fuse_direct_read/write,
>> then call wait_on_sync_kiocb(), not to return -EIOCBQUEUED.
> It sounds like you might be interested in the aio in-kernel interface
> that is being worked on in a patch series that gets loop issuing aio
> instead of doing sync io.
>
>   http://thread.gmane.org/gmane.linux.file-systems/69326/focus=1398723

Thanks, Zach! I've already considered using this patch, but thank you 
anyway.

Maxim

>
> - z
>
>

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