Re: Flames over -- Re: Which is simpler?

[Pavel Machek <pavel@suse.cz>]

Hi!


> >You are ignoring the question of how the kernel can tell whether two 
> >devices are in fact the same.  There is no safe way to do this, 
> >other than having the hardware verify that the device was connected 
> >the whole time.
> >
> >  
> If there is no better way to tell for sure that the device that is 
> now there is not the same as the one that was there, then the kernel 
> must assume the user did not do something stupid and continue to use 

Must?! Are you Linus or what?

> the device as if it was not disconnected ( because odds are, it in 
> fact, was not ).  In other words, which is more safe?  ALLWAYS 
> loosing data because you can't be absolutely sure that the device is 
> the same, or only loosing data if the user does something as foolish 
> as swapping drives while suspended, and you can't tell they did?

You are missing this. In 1st case, no data is actually lost, because of
sync in suspend code;
while second case is "goodbye, filesystem".
				Pavel
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