It certainly isn't.
On Fri, 27 Apr 2007, Nigel Cunningham wrote:
You don't need to modify other programs. You just need to display the
progress bar and block _user input_. I don't even claim to know X, but I
would be extremely surprised if you technically can't say "don't let
the user touch any other windows except this one." The user couldn't care
less whether tasks are frozen or not by the kernel. What matters is that
the user can't shoot himself in the foot while snapshotting.
Furthermore, we probably do need to do other things to ensure safety, like
remounting filesystems read-only but again, this has nothing to do with
snapshotting per se. What the kernel needs to worry about is (1) providing
an atomic snapshot that is consistent and (2) resuming to that snapshot
safely. If the _user_ loses data that was generated between snapshot +
shutdown, it's absolutely no concern for the snapshot operation!
On Fri, 27 Apr 2007, Nigel Cunningham wrote:
But you just explained how we can! We shouldn't bend over backwards for
snapshotting just because the filesystems don't currently support
something we need.
On Fri, 27 Apr 2007, Nigel Cunningham wrote:
Don't worry, I am used to cold water :-).
Pekka
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