linux-kernel - VFAT complains that my file system may be corrupted

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Message-ID: <CA+8MBb++1CVLAo3zw4fx2O7akWsZcvybRyZpt0ac0sX7M=u5Xw@mail.gmail.com>
Date:	Mon, 6 May 2013 11:36:38 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Oleksij Rempel <bug-track@...her-privat.net>
Cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: VFAT complains that my file system may be corrupted

Built Linus' tree this morning (HEAD =
d7ab7302f970a254997687a1cdede421a5635c68) and got this message:

FAT-fs (sda1): Volume was not properly unmounted. Some data may be
corrupt. Please run fsck.

when booting my ia64 machine.  The message may well be legitimate
because I did crash the machine, so the filessytem was not unmounted
cleanly.

BUT ... If I unmount and run fsck as it suggests, then I see:

# fsck /boot/efi
fsck from util-linux-ng 2.16
dosfsck 2.11, 12 Mar 2005, FAT32, LFN
There are differences between boot sector and its backup.
Differences: (offset:original/backup)
  65:01/00
1) Copy original to backup
2) Copy backup to original
3) No action

I tried option 3 - fsck made no other changes, but I still see the
message. I tried
option 1 - and I still see the message. So I went for option 2 ... and
guess what,
I still see the message when I mount this filesystem.

Note that with either option 1 or 2 "fsck" says:

Leaving file system unchanged.
/dev/sda1: 20 files, 19865/255496 clusters

This is the first time I've ever seen this message ... but I haven't
had this system crash for some time, so not really sure when this may
have started.

-Tony
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