mount_vnd(8) - OpenBSD manual pages (original) (raw)

NAME

mount_vnd —mount vnode disks

SYNOPSIS

DESCRIPTION

mount_vnd works similarly tovnconfig(8), but it provides an interface that can be used by thefstab(5) infrastructure, so that an image file can be configured to a device vnd_dev while booting.

For fstab(5) lines with type “ffs”, the “noauto” option must be set to prevent amount(8) of the FFS partitions before the necessary vnd devices are configured. Also, the “fs_passno” field has to be set to 0 to preventfsck(8) from checking the file system for the same reasons.

mount_vnd is invoked bymount(8) when using the following syntax:

mount [options] -t vndimage vnd_dev

The options are as follows:

-K rounds

Associate an encryption key with the device. All data will be encrypted using the Blowfish cipher before it is written to the disk. The user is asked for both a passphrase and the name of a salt file. The salt file can also be specified on the command line using the -S option. The passphrase and salt are combined according to PKCS #5 PBKDF2 for the specified number of rounds to generate the actual key used.rounds is a number between 1000 andINT_MAX. DO NOT LOSE THE SALT FILE.

-k

Associate an encryption key with the device. All data will be encrypted using the Blowfish cipher before it is written to the disk.

-o options

Options are specified with a -o flag followed by a comma separated string of options. See themount(8) man page for possible options and their meanings.

At the moment, -o is only here for compatibility reasons, but no use is made of supplied options.

-S saltfile

When -K is used, specify thesaltfile.

-t disktype

Specify a disktype entry from thedisktab(5) database. The vnd_dev will have the sector size, sectors per track, and tracks per cylinder values of the specified disktype. The defaults are 512-byte sectors, 100 sectors per track and 1 track per cylinder.

FILES

/dev/{,r}vnd*

EXAMPLES

An example fstab(5) entry is:

/tmp/cryptimg /dev/vnd0c vnd rw,noauto,-k 0 0 /dev/vnd0a /mnt ffs rw,noauto 0 0

Mounting images during the first pass offsck(8) andmount(8) is not possible, because the image to be configured to a vnd itself resides on a file system that first has to be checked and mounted.

SEE ALSO

vnd(4), disktab(5), fstab(5), mount(8), swapon(8), umount(8)

HISTORY

The mount_vnd command first appeared inOpenBSD 4.2.