On 09/28/2010 11:27 AM, Mark Morgan Lloyd wr
The bottom line is that when a system gets a powerfail signal it will
unmount all filesystems and shut down. But the action of unmounting
rewrites (something equivalent to) the superblock to reset the dirty
flag, and that requires that power remains stable.
Yes. This is why unmounting might make the system even less safe. If
some data is not written back at all only those are bad. But it you
unmount and thus rewrite the superblock immediately before power down
the card might trash more and more important data.
-Michael
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