DBMOUNT(8)

NAME
dbmount, dbumount - mount and dismount "DouBle" compressed block devices

SYNOPSIS
dbmount special double_dev dbumount special dbumount double_dev mount [options] -t dble special cdouble_dev umount [options] special umount [options] cdouble_dev

DESCRIPTION
The dbmount and mount -t dble commands can be used to map a virtual double_dev (normally /dev/doubleN with major = 19 and minor = N for dbmount) or cdouble_dev (/dev/cdoubleN, with minor = 128+N for mount) block device where non compressed blocks can be accessed, to a special device or file where data is compressed. dbmount takes no option. for mount options, refer to mount(8). The dbumount and umount commands release the virtual double_dev (or cdouble_dev) block device from the special file. dbumount takes no option. for umount options, refer to umount(8).

NOTES
These utilities require the "DouBle" patches to be compiled in the Linux kernel. umount can only be used for a device mounted with the mount -t dble command and dbumount must be used for a device that has been mounted with the dbmount command.

SEE ALSO
mount(8),umount(8),mkdble(8),dbck(8),dbmode(8)

BUGS
dbmounting (read/write) a file which is located on a read-only filesystem may yield unexpected results. Files on filesystems that do not implement the bmap function call, such as some MS-DOS filesystems, cannot be used with the "DouBle" compression driver.

AUTHOR
Jean-Marc Verbavatz <jmv@achaz.saclay.cea.fr>