Re: [PATCH] Use of getblk differs between locations

From: Pavel Machek
Date: Fri Oct 14 2005 - 04:29:12 EST


> >>- the write of these data waits until the dialog window is
> >>displayed,
> >>user inserts the device and clicks 'OK'
> >
> >No, it's not, and deadlock is definitely possible. However, if we're
> >at
> >the point where memory is tight enough that it's an issue, the timer
> >can
> >expire and all the pending i/o is dropped just as it would be without
> >the multipath code enabled.
> >
> >I'm not saying it's a solution ready for production, just a good
> >starting point.
> But discarding data sometimes on USB unplug is even worse than
> discarding data always --- users will by experimenting learn that

*Good starting point*.

Anyway, one solution would be to simply mlockall() on that
replugitd and/or make dirty data hdd based
(not ram based) and/or
restricting dirty buffers to 10MB for removable media.

64 bytes from icmp_seq=28 ttl=51 time=448769.1 ms

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