linux refused to mount a valid partition

Question

My setup is a linux box with 1 partition used thought LVM - has been working for years.

I add a freeze and after the reboot the partition cannot be mounted:

mount -r -t ext3 /dev/pve/data /mnt/pve-data

mount: wrong fs type, bad option, bad superblock on /dev/mapper/pve-data, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

However fsck doesn't see any problem with it:

fsck.ext3 -fp /dev/pve/data

/dev/pve/data: 3024076/60366848 files (0.6% non-contiguous), 156921642/241435648 blocks

There's nothing in dmegs nor the syslog.

I'm puzzled, what's wrong with my partition?

Thanks in advance

greg

debian 5.0.10

LVM 2.02.39

Answer 1

The partition in question probably is ext4 and not ext3. Thus when the mount command notices this and then gives the error.

Answer 2

Check that the filesystem you are trying to mount has a loaded driver.

Run under root (or via sudo):

to get the filesystem type

blkid

root@kontron:~# blkid
/dev/sda1: UUID="9de9be9f-04c9-4542-b0e0-3f9a2cb1c785" TYPE="ext3"
/dev/sda5: UUID="0958ee8b-55d8-462a-8dcf-1674c7212690" TYPE="swap"

to list loaded kernel modules

lsmod

root@kontron:~# lsmod | grep ext
ext3                   94204  1 
jbd                    32269  1 ext3
mbcache                 3762  1 ext3

if module isn't loaded try finding it under the corresponding modules folder

ls -la /lib/modules/$(uname -r)/kernel/fs
drwxr-xr-x 59 root root  4096 Jul  7 13:42 .
drwxr-xr-x 10 root root  4096 Jul  7 13:42 ..
drwxr-xr-x  2 root root  4096 Jul  7 13:42 ext2
drwxr-xr-x  2 root root  4096 Jul  7 13:42 ext3
drwxr-xr-x  2 root root  4096 Jul  7 13:42 ext4

*Please note that if you are executing tese under initramfs sometimes it requires installing additional kernel modules and rebuilding the initramfs

try loading the necessary module

modprobe -v ext3

and repeat the mount

mount -r -t ext3 /dev/pve/data /mnt/pve-data