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