Can someone explain this: writable partition becomes read-only ?

[pavlo_7]

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Partition is writable (/dev/hda4 /mnt/hda4 ext3 rw 0 0), but when i try to alter it, it becomes read-only (/dev/hda4 /mnt/hda4 ext3 ro 0 0):

root@ttyp2[/]# cat /proc/mounts

rootfs / rootfs rw 0 0
/dev/root.old / ext2 rw 0 0
/proc /proc proc rw,nodiratime 0 0
/dev/pts /dev/pts devpts rw 0 0
/sys /sys sysfs rw 0 0
/dev/scd0 /cdrom iso9660 ro 0 0
/dev/cloop /KNOPPIX iso9660 ro 0 0
/ramdisk /ramdisk tmpfs rw 0 0
/proc/bus/usb /proc/bus/usb usbdevfs rw 0 0
automount(pid1569) /mnt/auto autofs rw 0 0
/dev/cdrom /mnt/auto/cdrom iso9660 ro,nosuid,nodev 0 0
/dev/hdc4 /mnt/hdc4 ext3 rw 0 0

root@ttyp2[/]# mount /dev/hda4 /mnt/hda4

root@ttyp2[/]# ls /mnt/hda4/opt/force/sources

linux-2.6.12.1  linux-2.6.12.1.tar.bz2  make-3.80.tar.gz  ncurses-5.4.tar.gz

root@ttyp2[/]# cat /proc/mounts

rootfs / rootfs rw 0 0
/dev/root.old / ext2 rw 0 0
/proc /proc proc rw,nodiratime 0 0
/dev/pts /dev/pts devpts rw 0 0
/sys /sys sysfs rw 0 0
/dev/scd0 /cdrom iso9660 ro 0 0
/dev/cloop /KNOPPIX iso9660 ro 0 0
/ramdisk /ramdisk tmpfs rw 0 0
/proc/bus/usb /proc/bus/usb usbdevfs rw 0 0
automount(pid1569) /mnt/auto autofs rw 0 0
/dev/cdrom /mnt/auto/cdrom iso9660 ro,nosuid,nodev 0 0
/dev/hdc4 /mnt/hdc4 ext3 rw 0 0
/dev/hda4 /mnt/hda4 ext3 rw 0 0

root@ttyp2[/]# rm -rf /mnt/hda4/opt/force/sources/linux-2.6.12.1

rm: cannot remove directory `/mnt/hda4/opt/force/sources/linux-2.6.12.1': Read-only file system

root@ttyp2[/]# cat /proc/mounts

rootfs / rootfs rw 0 0
/dev/root.old / ext2 rw 0 0
/proc /proc proc rw,nodiratime 0 0
/dev/pts /dev/pts devpts rw 0 0
/sys /sys sysfs rw 0 0
/dev/scd0 /cdrom iso9660 ro 0 0
/dev/cloop /KNOPPIX iso9660 ro 0 0
/ramdisk /ramdisk tmpfs rw 0 0
/proc/bus/usb /proc/bus/usb usbdevfs rw 0 0
automount(pid1569) /mnt/auto autofs rw 0 0
/dev/cdrom /mnt/auto/cdrom iso9660 ro,nosuid,nodev 0 0
/dev/hdc4 /mnt/hdc4 ext3 rw 0 0
/dev/hda4 /mnt/hda4 ext3 ro 0 0

root@ttyp2[/]#

Can someone explain why this happens?
Thank you!

[borromini]

Can you post the contents of /etc/fstab?

[pavlo_7]

Can you post the contents of /etc/fstab?

this is the contents:

root@ttyp2[/]# cat /etc/fstab
/proc      /proc       proc   defaults            0 0
/sys       /sys        sysfs  noauto              0 0
/dev/pts   /dev/pts    devpts mode=0622           0 0
/dev/fd0   /mnt/auto/floppy auto   user,noauto,exec,umask=000    0 0
/dev/cdrom /mnt/auto/cdrom  auto   user,noauto,exec,ro 0 0
/dev/cdrom1 /mnt/auto/cdrom1  auto   users,noauto,exec,ro 0 0
# Added by KNOPPIX
/dev/hda1 /mnt/hda1 vfat noauto,users,exec,umask=000,uid=knoppix,gid=knoppix 0 0
# Added by KNOPPIX
/dev/hda3 /mnt/hda3 ext3 noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda4 /mnt/hda4 ext3 noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda5 /mnt/hda5 ntfs noauto,users,exec,ro,umask=000,uid=knoppix,gid=knoppix 0 0
# Added by KNOPPIX
/dev/hda6 /mnt/hda6 vfat noauto,users,exec,umask=000,uid=knoppix,gid=knoppix 0 0
# Added by KNOPPIX
/dev/hda7 none swap defaults 0 0
# Added by KNOPPIX
/dev/hdc1 /mnt/hdc1 ext2 noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hdc2 none swap defaults 0 0
# Added by KNOPPIX
/dev/hdc3 /mnt/hdc3 ext3 noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hdc4 /mnt/hdc4 ext3 noauto,users,exec 0 0
root@ttyp2[/]#

thanks for fast reply!

[sharkyro]

Change the line in fstab to:

/dev/hda4   /mnt/d      vfat mask=0222,dmask=0000,uid=0002,gid=users,users 0 0

and the partition will be mounted as read/write.

[pavlo_7]

thanks, I will try adding the line to fstab

[pavlo_7]

Change the line in fstab to:

/dev/hda4   /mnt/d      vfat mask=0222,dmask=0000,uid=0002,gid=users,users 0 0

and the partition will be mounted as read/write.

tried to do that.
actually, /dev/hda4 is ext3, not a vfat (fat32).
So ... I used your code, but replaced vfat with ext3.
I also tried chroot to that partition and delete the file.
Still the same result: writable partition becomes read-only.
Don't know what else to do.
Edit: I am actually doing it from Knoppix. But think I would get the same results even if I changed fstab on an installed Linux, and tried to alter that partition.