On Friday, 20 July 2007 19:31, Jeremy Maitin-Shepard wrote: > Milton Miller <miltonm@xxxxxxx> writes: > > [snip] > > >>>> (7) how to avoid corrupting filesystems mounted by the hibernated kernel > >>> > >>> I didn't realize this was a discussion item. I thought the options were > >>> clear, for some filesystem types you can mount them read-only, but for > >>> ext3 (and possilby other less common ones) you just plain cannot touch > >>> them. > >> > >> That's correct. And since you cannot thouch ext3, you need either to assume > >> that you won't touch filesystems at all, or to have a code to recognize the > >> filesystem you're dealing with. > > > Or add a small bit of infrastructure that errors writes at make_request if you > > don't have a magic "i am a direct block device write from userspace" flag on the > > bio. > > I still don't understand why there is this fixation on accessing dirty > filesystems in use by the hibernated system. Even if you avoid > corrupting the filesystem by avoiding writing to the block device, there > isn't any real guarantee about the state of the data, except for a > filesystem that specifically makes guarantees about such data (and I > don't believe any of the existing ones do). > > It isn't necessary to be able to access such filesystems: everything can > be done from an initramfs/initrd. That's correct, but you need an additional ramdisk for that (yet another complication). Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
