Re: [PATCH] Use of getblk differs between locations

From: Mikulas Patocka
Date: Wed Oct 12 2005 - 19:23:32 EST

On Thu, 13 Oct 2005, Jamie Lokier wrote:

Mikulas Patocka wrote:
But discarding data sometimes on USB unplug is even worse than discarding
data always --- users will by experimenting learn that linux doesn't
discard write-cached data and reminds them to replug the device --- and
one day, randomly, they lose their data because of some memory management

It should not happen provided the total amount of dirty data for
detachable devices is restricted to allow enough room for opening a

That is possible ... you must also make sure that you do not hold an important semaphore while waiting for some removable device (auditing VFS for this will be a bit harder...)


That's no different, in principle, than the restrictions that are used
to ensure some types of kernel memory allocation always succeed.

There's no exact calculation, just a notion of "this many megabytes
should be enough for a dialog".

-- Jamie

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