Messages in this thread | | | Date | Sat, 06 Jan 2001 15:35:02 -0500 | From | Chris Mason <> | Subject | Re: Journaling: Surviving or allowing unclean shutdown? |
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On Saturday, January 06, 2001 09:09:51 PM +0100 Stefan Traby <stefan@hello-penguin.com> wrote:
> On Sat, Jan 06, 2001 at 08:57:26PM +0100, Marc Lehmann wrote: > >> reply. Sure, you can do virtual log replays, but for example the reiserfs >> log is currently 32mb. Pinning down that much memory for a virtual log >> reply is not possible on low-memory machines. > > Nobody with working brain would read it completely into memory. > One just put the block-# that are in the journal into a hash-table > and read the block out of the journal when it's requested. > Because there may be multiple copies of the same block in the > journal, one should take the newest one that can be found in > the last commited transaction. > > IMHO Chris Mason already wrote such code, at least he talked about > it... > Talked about it, but never wrote it. However, I know there was code to do this for grub, I'm not sure if it ever made it into their releases.
-chris
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