Re: [linux-usb-devel] USB/hal: USB open() broken? (USB CD burner underruns, USB HDD hard resets)

[Bodo Eggert]

Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:
> Ar Maw, 2006-06-20 am 11:05 +0200, ysgrifennodd Andreas Mohr:

>> But how would HAL safely determine whether a (IDE/USB) drive is busy?
>> As my test app demonstrates (without HAL running), the *very first* open()
>> happening during an ongoing burning operation will kill it instantly, in the
>> USB case.
>> Are there any options left for HAL at all? Still seems to strongly point
>> towards a kernel issue so far.
> 
> In the IDE space O_EXCL has the needed semantics. At least it does on
> Fedora and I don't think thats a Fedora patch, not sure if this is the
> case for the USB side of things.

This does not work, since O_EXCL does not work:
http://lkml.org/lkml/2006/2/5/137

Instead, I'd (try to) use mandatory locking and prevent open() etc. from
causing the bad commands to be sent.
-- 
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.

http://david.woodhou.se/why-not-spf.html
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