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docs: filesystems: convert bfs.txt to ReST

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- 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>
This commit is contained in:
Mauro Carvalho Chehab 2020-02-17 17:11:53 +01:00 committed by Jonathan Corbet
parent c54ad9a4e8
commit ee68f34d7e
2 changed files with 21 additions and 17 deletions
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37
Documentation/filesystems/bfs.txt → Documentation/filesystems/bfs.rst
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@ -1,4 +1,7 @@
BFS FILESYSTEM FOR LINUX
.. SPDX-License-Identifier: GPL-2.0
========================
BFS Filesystem for Linux
========================
The BFS filesystem is used by SCO UnixWare OS for the /stand slice, which
@ -9,22 +12,22 @@ 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:
BFS filesystem via loopback::
# losetup /dev/loop0 stand.img
# mount -t bfs /dev/loop0 /mnt/stand
# losetup /dev/loop0 stand.img
# mount -t bfs /dev/loop0 /mnt/stand
where stand.img is a file containing the image of BFS filesystem.
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:
/dev/loop0 device by::
# losetup -d /dev/loop0
# losetup -d /dev/loop0
You can simplify mounting by just typing:
You can simplify mounting by just typing::
# mount -t bfs -o loop stand.img /mnt/stand
# mount -t bfs -o loop stand.img /mnt/stand
this will allocate the first available loopback device (and load loop.o
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
@ -33,21 +36,21 @@ that modprobe is functioning. Beware that umount will not deallocate
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:
slice contains it. The command prtvtoc(1M) is your friend::
# prtvtoc /dev/rdsk/c0b0t0d0s0
# 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:
information you can use dd(1) to create the BFS image::
# umount /stand
# dd if=/dev/rdsk/c0b0t0d0sa of=stand.img bs=512
# 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:
the magic number::
# od -Ad -tx4 stand.img | more
# od -Ad -tx4 stand.img | more
The first 4 bytes should be 0x1badface.

1
Documentation/filesystems/index.rst
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@ -53,6 +53,7 @@ Documentation for filesystem implementations.
autofs
autofs-mount-control
befs
bfs
fuse
overlayfs
virtiofs