Messages in this thread | | | From | Andreas Dilger <> | Date | Wed, 6 Nov 2002 01:41:43 -0700 | Subject | Re: 2.4.20-rc1 dirty ext2 mount error |
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On Nov 06, 2002 17:26 +1100, Keith Owens wrote: > Unclean shutdown, reboot. > > LILO boot: 2.4.20-rc1 > Loading 2.4.20-rc1........................ > Linux version 2.4.20-rc1 (kaos@sherman) (gcc version 3.2 20020822 (Red Hat Linux Rawhide 3.2-4)) #10 SMP Wed Nov 6 16:10:31 EST 2002 > Kernel command line: auto BOOT_IMAGE=2.4.20-rc1 ro root=801 BOOT_FILE=/lib/modules/2.4.20-rc1/bzImage console=tty0 console=ttyS0,38400 mem=127M > EXT2-fs: sd(8,1): couldn't mount because of unsupported optional features (4). > Kernel panic: VFS: Unable to mount root fs on 08:01 > > Entering kdb (current=0xc11f4000, pid 1) on processor 1 due to KDB_ENTER() > [1]kdb> reboot > > Come up on 2.4.18-14 from RH. It detects ext3 and cleans the journal, > even though fstab says ext2. Then ext2 does fsck.ext2 -a /dev/sda1. I > guess the question is why ext3 is being used when fstab says ext2? > Especially when that stuffs up booting into other kernels that do not > have ext3 support at all.
/etc/fstab is not available until after the kernel mounts the root filesystem, so what is in /etc/fstab is totally irrelevant here.
If you don't simultaneously crash your system running ext3, and then reboot into a kernel which does not support ext3 you will be fine. A clean shutdown will clear the "needs_recovery" flag (and any ext2-only kernel can blissfully use that filesystem), any ext3-aware kernel can also mount it again and do a journal flush, or any modern (last year or two) e2fsck will clean it up too (from a rescue disk if desparate).
Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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