[3442] in linux-scsi channel archive
Re: Important: fs corruption with 2.0.33 and removable media
daemon@ATHENA.MIT.EDU (C.J. Oster)
Tue Mar 3 20:41:02 1998
Date: Tue, 3 Mar 1998 18:50:38 -0500
To: Wolfram@informatik.uni-bonn.de
From: cjo@pobox.com (C.J. Oster)
Cc: linux-scsi@vger.rutgers.edu
No problem here, AHA1520B, Syquest EZ135. Perhapse it's an optical thing.
I'll hook up my pd drive soon and see if that makes a difference.
-CJO-
>There is a very disastrous bug in 2.0.33 (untested with 2.1.x):
>The disc change detection with removable media is not 100% working !
>This has a destroying effect if your computer has enough RAM for caching.
>[tested... :-(((( ]
>
>Please test the following with your hardware: (reproduce able for me)
>-mount the media and unmount it
>-eject the media
>-insert another media
>-wait ~ 30 min. without doing anything at your computer (important !)
>-mount this media (better mount it ro for safety !)
>-no disc change detection.... (look at the kernel logs)
>
>It looks like the disc change has been forgotten in these 30 min.
>The disc change detection works normal if the change and mount happens within
>less time.
>
>The hardware: Fujitsu M2512A2 (230MB MO Drive & 230MB Media)
> ncr53c825 SCSI interface (with Gerard Roudier's driver)
>
>
>Is this reproduce able by other people ?
>
>Is there any possibility to fix this bug inside the kernel ?
>E.g. test every minute for disc change detection ?
>
>
>PS:
>A little fix for ext2:
>Don't flood the kernel logs with "Remounting filesystem read-only" messages if
>it has been done already.
>
>--- /usr/src/linux/fs/ext2/super.c~ Tue Jul 15 12:54:04 1997
>+++ /usr/src/linux/fs/ext2/super.c Tue Mar 3 12:48:02 1998
>@@ -56,7 +56,8 @@
> if (test_opt (sb, ERRORS_RO) ||
> (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
> !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
>- printk ("Remounting filesystem read-only\n");
>+ if (!(sb->s_flags & MS_RDONLY))
>+ printk(KERN_ALERT "Remounting filesystem read-only\n");
> sb->s_flags |= MS_RDONLY;
> }
> }
>
>
>
>-
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C.J. Oster
cjo@pobox.com
FUllnet Communications
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