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SubjectRe: Journaling: Surviving or allowing unclean shutdown?
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...

--

ciao -
Stefan

" ( cd /lib ; ln -s libBrokenLocale-2.2.so libNiedersachsen.so ) "

Stefan Traby Linux/ia32 fax: +43-3133-6107-9
Mitterlasznitzstr. 13 Linux/alpha phone: +43-3133-6107-2
8302 Nestelbach Linux/sparc http://www.hello-penguin.com
Austria mailto://st.traby@opengroup.org
Europe mailto://stefan@hello-penguin.com
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