Re: Journaling: Surviving or allowing unclean shutdown?

Stefan Traby (stefan@hello-penguin.com)
Thu, 4 Jan 2001 22:08:21 +0100


On Thu, Jan 04, 2001 at 07:21:04PM +0000, Stephen C. Tweedie wrote:

> ext3 does the recovery automatically during mount(8), so user space
> will never see an unrecovered filesystem. (There are filesystem flags
> set by the journal code to make sure that an unrecovered filesystem
> never gets mounted by a kernel which doesn't know how to do the
> appropriate recovery.)

I did not follow the ext3 development recently, how did you solve
the "read-only mount(2) (optionally on write protected media)" issue ?

Does the mount fail, or does the code virtually replays (without writing)
only ?

I think any other action (only replaying on rw mount and presenting
a broken filesystem on ro) is quite fatal, at least if I think of
a replay on -remount,rw :)

Also, an unconditional hidden replay even if "ro" is specified is not nice.

This is especially critical on root filesystem, because there is IMHO
no way to specify mount arguments to the "/" mount, except ro/rw.

-- 

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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/