Corruption caused by umount not flushing the buffer cache.

[James Bottomley]

alan en lxorguk.ukuu.org.uk said:
> Solve policy problems in user space. If you want a umount to do that
> put it in the _application_. I don't want my caches flushing all the
> time just because I remount stuff 

I can certainly live with this.  The problem I had was just that the semantics 
were unexpected and undocumented.

I've talked to our kernel group about this and we agree that not invalidating 
the buffer cache makes a lot of sense, particularly if people use automounted 
block devices.

> I can't find anything  in the posix or SuS about this. In fact I can't
> find anything in the V7 manual about it either. 

Historically it comes from Unixware which is used as the SysV4 reference 
platform.  I've asked our standards person to enquire but I think there won't 
be any documentation since issues that only impact clustering are seldom 
documented.

James Bottomley



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