NAME
mount_vnd
—
mount vnode disks
SYNOPSIS
mount_vnd |
[-k ] [-K
rounds] [-o
options] [-S
saltfile] [-t
disktype] image vnd_dev |
DESCRIPTION
mount_vnd
works similarly to
vnconfig(8), but it
provides an interface that can be used by the
fstab(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 a mount(8) of the FFS partitions before the necessary vnd devices are configured. Also, the “fs_passno” field has to be set to 0 to prevent fsck(8) from checking the file system for the same reasons.
mount_vnd
is invoked by
mount(8) when using the
following syntax:
mount
[options] -t vnd
image vnd_devThe 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 the mount(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 the saltfile. -t
disktype- Specify a disktype entry from the disktab(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 of fsck(8) and mount(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 in
OpenBSD 4.2.