On 7/27/06, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:
That should be three I think. frevoke and revoke should not return until
all the existing outstanding is dead. For devices that means we need to
wake up the device where possible and really suggests we need a device
->revoke method. TTY devices need this to allow us to re-implement
vhangup in terms of revoke. Other devices devices are not all
sufficiently secure without this check. Some may also want to use this
hook to ensure that any security context is dead (eg cached crypto
keys).
Don't device drivers already do that for f_ops->flush (filp_close) and
vm_ops->close (munmap)? What revoke and frevoke do is basically
unmap/fsync/close on all the open file descriptors.
Pekka
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