mount vnode disks
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
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_dev
The options are as follows:
- 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
-Soption. 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 and
INT_MAX. DO NOT LOSE THE SALT FILE.
- Associate an encryption key with the device. All data will be encrypted using the Blowfish cipher before it is written to the disk.
- Options are specified with a
-oflag followed by a comma separated string of options. See the mount(8) man page for possible options and their meanings.
At the moment,
-ois only here for compatibility reasons, but no use is made of supplied options.
-Kis used, specify the saltfile.
- 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.
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.
vnd(4), disktab(5), fstab(5), mount(8), swapon(8), umount(8)
mount_vnd command first appeared in