Hi Alan Cox,

on 30-May-99 you wrote:

>> >at least all Fujitsu MO drives (the vast majority of MOs).
> 
> Its not all Fujitsu MO drives. It works fine on my 640AI.

This is what /proc/scsi/scsi says on my host:

Host: scsi1 Channel: 00 Id: 05 Lun: 00
  Vendor: FUJITSU  Model: M2513A           Rev: 1700
  Type:   Direct-Access                    ANSI SCSI revision: 02

> 
> The drive is reported as a scsi-removable (correctly), and if I do
> tar xvf /dev/sda
> 
> then eject and change disk, then tar xvf /dev/sda
> 
> I see two different archives

I think it may well be a problem of e2fs. Your method does not involve any
file systems.

>> >MSDOS formatted disk between two e2fs-formatted ones to force a flush 
>> in some way.
>> 
>> You can also try to mount the device without inserting a disk (you'll 

Mounting without inserting a disk does NOT fix the problem for me.

> The MS-DOS one would be a block size change causing a flush. That would
> make sense.

> Do you see a disk change notification when you change disk or not ?

I see one in the kernel log when I issue a mount command.

I have appended a piece of syslog - it shows the following:

1) I insert, mount and directly unmount an ext2 formatted MO after having
   unmounted and removed an other ext2 formatted MO.

Jun  1 15:43:08 localhost kernel: VFS: Disk change detected on device sd(8,0) 
Jun  1 15:43:08 localhost kernel: SCSI device sda: hdwr sector= 2048 bytes.
Sectors= 310352 [606 MB] [0.6 GB] 
Jun  1 15:43:08 localhost kernel: sda: Write Protect is off 
Jun  1 15:43:08 localhost kernel:  sda: unknown partition table 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 3, stored = 0,
counted = 7884 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 4, stored = 787,
counted = 4753 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 5, stored = 0,
counted = 16371 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 7, stored = 0,
counted = 3699 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 8, stored = 0,
counted = 3896 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 11, stored = 0,
counted = 16372 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 12, stored = 0,
counted = 16372 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 13, stored = 0,
counted = 14809 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 16, stored = 1467,
counted = 4692 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 17, stored =
16372, counted = 0 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count for group 18, stored = 3879,
counted = 0 
Jun  1 15:43:08 localhost kernel: EXT2-fs error (device sd(8,0)):
ext2_check_blocks_bitmap: Wrong free blocks count in super block, stored =
88967, counted = 88849 

[ 50 more lines deleted ]

2) I mount a DOS-formatted MO

Jun  1 15:44:53 localhost kernel: VFS: Disk change detected on device sd(8,0) 
Jun  1 15:44:53 localhost kernel: SCSI device sda: hdwr sector= 2048 bytes.
Sectors= 310352 [606 MB] [0.6 GB] 
Jun  1 15:44:53 localhost kernel: sda: Write Protect is off 
Jun  1 15:44:53 localhost kernel:  sda: unknown partition table 
Jun  1 15:44:53 localhost kernel: MSDOS: Hardware sector size is 2048 

3) I mount the MO from 1) again

Jun  1 15:45:35 localhost kernel: VFS: Disk change detected on device sd(8,0) 
Jun  1 15:45:35 localhost kernel: SCSI device sda: hdwr sector= 2048 bytes.
Sectors= 310352 [606 MB] [0.6 GB] 
Jun  1 15:45:35 localhost kernel: sda: Write Protect is off 
Jun  1 15:45:36 localhost kernel:  sda: unknown partition table 
Jun  1 15:45:36 localhost kernel: EXT2-fs warning: mounting fs with errors,
running e2fsck is recommended 

4) I run e2fsck

fionn@rtfm[~] e2fsck /dev/sda  
e2fsck 1.12, 9-Jul-98 for EXT2 FS 0.5b, 95/08/09
/dev/sda contains a file system with errors, check forced.
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/sda: 116/2432 files (9.5% non-contiguous), 221385/310352 blocks


Kernel used for this test: 2.3.0

Hope this helps.

Fionn

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