> On Jul 12, 2002 08:53 -0400, Richard B. Johnson wrote:
> > If file-systems are mounted upon boot with 'defaults' as options
> >
> > like /etc/fstab...
> > /dev/sdc1 /alt ext2 defaults 0 2
> >
> > mount -o remount,rw,noatime /alt
> >
> > The result is (correctly)
> > /dev/sdc1 /alt ext2 rw,noatime 0 0
> >
> > Now, if I shut down the system, properly dismounting all the drives,
> > then I reboot, the drives that were re-mounted end up being fscked
> > due to 'was not cleanly unmounted' inference. Nothing wrong is found.
> >
> > Now, if I mount the drives "noatime" from the start, i.e., from
> > /etc/fstab upon startup, there are no such errors upon re-boot.
>
> There was once a problem that if you mounted a filesystem and crashed
> shortly thereafter the filesystem would mistakenly be marked clean and
> not checked when it should be, but I haven't heard the opposite problem.
>
> I did a quick check (just mounting an ext2 filesystem on 2.4.18 from bash,
> remounting, then unmounting) and everything worked as expected. Could
> you try doing your test and running "dumpe2fs -h /dev/foo" between each
> step to check the filesystem state. It should be "not clean" until the
> filesystem is unmounted, at which point it should be "clean".
>
> Also try doing the unmount steps manually before shutdown to see if it
> is a timing issue. If you have writeback cache enabled on your disks
> and this is not being flushed to the oxide before power is lost you may
> not just be having an fsck problem, but also a data loss/corruption
> problem.
>
> Cheers, Andreas
> --
Script started on Fri Jul 12 12:54:51 2002
[9;0]#
#
#
# umount -s a
umount: /mnt: device is busy
#
#
#
# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 6211760 9548208 39% /
/dev/fd0 1423 25 1398 2% /mnt
# umount /
# dumpe2fs -h /dev/sdb1
dumpe2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: ea36cab5-82d4-4717-b572-57828567263c
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: filetype sparse_super
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 2109408
Block count: 4217054
Reserved block count: 210852
Free blocks: 2597904
Free inodes: 1867368
First block: 0
Block size: 4096
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16352
Inode blocks per group: 511
Last mount time: Fri Jul 12 12:55:11 2002
Last write time: Fri Jul 12 12:55:11 2002
Mount count: 15
Maximum mount count: 20
Last checked: Thu May 23 13:05:14 2002
Check interval: 15552000 (6 months)
Next check after: Tue Nov 19 12:05:14 2002
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
# dumpe2fs -d /dev/sdc1
dumpe2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
dumpe2fs: invalid option -- d
Usage: dumpe2fs [-bV] [-ob superblock] [-oB blocksize] device
# dumpe2fs -h /dev/sdc1
dumpe2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: c9ec8442-5c82-4e97-a010-461f3a47464b
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: filetype sparse_super
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 808000
Block count: 1614524
Reserved block count: 80726
Free blocks: 1289481
Free inodes: 759260
First block: 0
Block size: 4096
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16160
Inode blocks per group: 505
Last mount time: Fri Jul 12 04:21:17 2002
Last write time: Fri Jul 12 12:55:10 2002
Mount count: 2
Maximum mount count: 20
Last checked: Fri Jul 12 04:18:38 2002
Check interval: 15552000 (6 months)
Next check after: Wed Jan 8 03:18:38 2003
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
# cat /etc/fstab
# /etc/fstab
# static file system information
#
# This file is not used by the kernel, but rather by mount(8) and umount(8)
# (and some day fsck(8)). Comment lines have "#" in the first column.
# Entries that are to be ignored should have "none" in the directory field,
# and have type "ignore" or options "xx". Frequency and pass are numeric
# fields for dump(8) and fsck(8) that are not used yet in Linux. You can
# leave them empty if want.
# device directory type options freq pass
# -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
/dev/sdb1 / ext2 rw,noatime 0 1
/dev/sdc1 /alt ext2 rw,noatime 0 2
/dev/sdb2 none swap defaults 0 2
/dev/sdc2 none swap defaults 0 2
/dev/sdc3 /home/users ext2 rw,noatime 0 2
none /proc proc defaults 0 2
/dev/sda1 /dos/drive_C msdos defaults 0 2
/dev/sda5 /dos/drive_D msdos defaults 0 2
#/dev/sdb1 /alt ext2 defaults 0 2
#/dev/sda6 /dos/drive_E msdos defaults 0 2
#/dev/sda7 /dos/drive_F msdos defaults 0 2
#/dev/sdb1 /home/hpbd ext2 defaults 0 2
#/dev/sdc1 /home/disk3 ext2 defaults 0 2
#/dev/sdd1 /laser ext2 defaults 0 2
#/dev/sdd3 /laser/home ext2 defaults 0 2
#/dev/cdrom /cdrom iso9660 ro,user 0 2
# dumpe2fs -d h /dev/sdc3
dumpe2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 89cb684f-de7d-460f-8d09-be328b3ce3bb
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: filetype sparse_super
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 286272
Block count: 572315
Reserved block count: 28615
Free blocks: 121190
Free inodes: 197598
First block: 0
Block size: 4096
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 15904
Inode blocks per group: 497
Last mount time: Fri Jul 12 04:21:17 2002
Last write time: Fri Jul 12 12:55:10 2002
Mount count: 2
Maximum mount count: 20
Last checked: Fri Jul 12 04:19:33 2002
Check interval: 15552000 (6 months)
Next check after: Wed Jan 8 03:19:33 2003
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
# e2fsck /dev/sdb1
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
/dev/sdb1: clean, 242040/2109408 files, 1619150/4217054 blocks
# e2fsck /dev/sdc1
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
/dev/sdc1: clean, 48740/808000 files, 325043/1614524 blocks
# e2fsck /dev/sdc3
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
/dev/sdc3: clean, 88674/286272 files, 451125/572315 blocks
# e2fsck -f /dev/sdb1
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdb1: 242040/2109408 files (1.1% non-contiguous), 1619150/4217054 blocks
# mount -n -o remount /dev/sdb1 /
# mount -o remount /dev/sdb1 /
# mount -o remount,rw,noatime /dev/sdb1 /
# dumpe2fs -h /dev/sdb1
dumpe2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: ea36cab5-82d4-4717-b572-57828567263c
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: filetype sparse_super
Filesystem state: not clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 2109408
Block count: 4217054
Reserved block count: 210852
Free blocks: 2597904
Free inodes: 1867368
First block: 0
Block size: 4096
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16352
Inode blocks per group: 511
Last mount time: Fri Jul 12 13:03:01 2002
Last write time: Fri Jul 12 13:03:36 2002
Mount count: 1
Maximum mount count: 20
Last checked: Fri Jul 12 13:02:09 2002
Check interval: 15552000 (6 months)
Next check after: Wed Jan 8 12:02:09 2003
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
# umount /dev/sdb1
# dumpe2fs -h /dev/sdb1
dumpe2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: ea36cab5-82d4-4717-b572-57828567263c
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: filetype sparse_super
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 2109408
Block count: 4217054
Reserved block count: 210852
Free blocks: 2597904
Free inodes: 1867368
First block: 0
Block size: 4096
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16352
Inode blocks per group: 511
Last mount time: Fri Jul 12 13:04:15 2002
Last write time: Fri Jul 12 13:04:15 2002
Mount count: 1
Maximum mount count: 20
Last checked: Fri Jul 12 13:02:09 2002
Check interval: 15552000 (6 months)
Next check after: Wed Jan 8 12:02:09 2003
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
# >/foo
bash: /foo: Read-only file system
# cd /
# exit
exit
Script done on Fri Jul 12 13:05:19 2002
Booted with init=/bin/bash
Then I mounted a floppy off from /tmp, chdir there, and ran script.
Script started on Fri Jul 12 09:07:57 2002
bash# ls
dir dir.c makefile type.org typescri xxx.c
bash# fsck /dev/sdb1
bash: fsck: command not found
bash# e2fsck /dev/sdb1
bash: e2fsck: command not found
bash# /sbin/e2fsck /dev/sdb1
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
/dev/sdb1: was not cleanly unmounted, check forced
242040/2109408 files, 1619150/4217054 blocks
bash# /sbin/e2fsck /dev/sdc1
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
/dev/sdc1: was not cleanly unmounted, check forced
48740/808000 files, 325043/1614524 blocks
bash# /sbin/e2fsck /dev/sdc3
e2fsck 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
/dev/sdc3: clean, 88674/286272 files, 451125/572315 blocks
bash# pwd
/tmp
bash# exit
exit
Script done on Fri Jul 12 09:10:25 2002
If I don't remount with 'noatime' I don't get the unclean error
upon startup. /dev/sdc3 was clean (for some reason) while the
othet two were dirty.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Windows-2000/Professional isn't.
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