mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 16:11:38 +00:00
ee68f34d7e
- Add a SPDX header; - Adjust document title; - Some whitespace fixes and new line breaks; - Mark literal blocks as such; - Add it to filesystems/index.rst. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/93991bcc05e419368ee1e585c81057fb2c7c8d2b.1581955849.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
61 lines
2.2 KiB
ReStructuredText
61 lines
2.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
========================
|
|
BFS Filesystem for Linux
|
|
========================
|
|
|
|
The BFS filesystem is used by SCO UnixWare OS for the /stand slice, which
|
|
usually contains the kernel image and a few other files required for the
|
|
boot process.
|
|
|
|
In order to access /stand partition under Linux you obviously need to
|
|
know the partition number and the kernel must support UnixWare disk slices
|
|
(CONFIG_UNIXWARE_DISKLABEL config option). However BFS support does not
|
|
depend on having UnixWare disklabel support because one can also mount
|
|
BFS filesystem via loopback::
|
|
|
|
# losetup /dev/loop0 stand.img
|
|
# mount -t bfs /dev/loop0 /mnt/stand
|
|
|
|
where stand.img is a file containing the image of BFS filesystem.
|
|
When you have finished using it and umounted you need to also deallocate
|
|
/dev/loop0 device by::
|
|
|
|
# losetup -d /dev/loop0
|
|
|
|
You can simplify mounting by just typing::
|
|
|
|
# mount -t bfs -o loop stand.img /mnt/stand
|
|
|
|
this will allocate the first available loopback device (and load loop.o
|
|
kernel module if necessary) automatically. If the loopback driver is not
|
|
loaded automatically, make sure that you have compiled the module and
|
|
that modprobe is functioning. Beware that umount will not deallocate
|
|
/dev/loopN device if /etc/mtab file on your system is a symbolic link to
|
|
/proc/mounts. You will need to do it manually using "-d" switch of
|
|
losetup(8). Read losetup(8) manpage for more info.
|
|
|
|
To create the BFS image under UnixWare you need to find out first which
|
|
slice contains it. The command prtvtoc(1M) is your friend::
|
|
|
|
# prtvtoc /dev/rdsk/c0b0t0d0s0
|
|
|
|
(assuming your root disk is on target=0, lun=0, bus=0, controller=0). Then you
|
|
look for the slice with tag "STAND", which is usually slice 10. With this
|
|
information you can use dd(1) to create the BFS image::
|
|
|
|
# umount /stand
|
|
# dd if=/dev/rdsk/c0b0t0d0sa of=stand.img bs=512
|
|
|
|
Just in case, you can verify that you have done the right thing by checking
|
|
the magic number::
|
|
|
|
# od -Ad -tx4 stand.img | more
|
|
|
|
The first 4 bytes should be 0x1badface.
|
|
|
|
If you have any patches, questions or suggestions regarding this BFS
|
|
implementation please contact the author:
|
|
|
|
Tigran Aivazian <aivazian.tigran@gmail.com>
|