1 .. SPDX-License-Identifier: GPL-2.0 2 3 ======================== 4 BFS Filesystem for Linux 5 ======================== 6 7 The BFS filesystem is used by SCO UnixWare OS for the /stand slice, which 8 usually contains the kernel image and a few other files required for the 9 boot process. 10 11 In order to access /stand partition under Linux you obviously need to 12 know the partition number and the kernel must support UnixWare disk slices 13 (CONFIG_UNIXWARE_DISKLABEL config option). However BFS support does not 14 depend on having UnixWare disklabel support because one can also mount 15 BFS filesystem via loopback:: 16 17 # losetup /dev/loop0 stand.img 18 # mount -t bfs /dev/loop0 /mnt/stand 19 20 where stand.img is a file containing the image of BFS filesystem. 21 When you have finished using it and umounted you need to also deallocate 22 /dev/loop0 device by:: 23 24 # losetup -d /dev/loop0 25 26 You can simplify mounting by just typing:: 27 28 # mount -t bfs -o loop stand.img /mnt/stand 29 30 this will allocate the first available loopback device (and load loop.o 31 kernel module if necessary) automatically. If the loopback driver is not 32 loaded automatically, make sure that you have compiled the module and 33 that modprobe is functioning. Beware that umount will not deallocate 34 /dev/loopN device if /etc/mtab file on your system is a symbolic link to 35 /proc/mounts. You will need to do it manually using "-d" switch of 36 losetup(8). Read losetup(8) manpage for more info. 37 38 To create the BFS image under UnixWare you need to find out first which 39 slice contains it. The command prtvtoc(1M) is your friend:: 40 41 # prtvtoc /dev/rdsk/c0b0t0d0s0 42 43 (assuming your root disk is on target=0, lun=0, bus=0, controller=0). Then you 44 look for the slice with tag "STAND", which is usually slice 10. With this 45 information you can use dd(1) to create the BFS image:: 46 47 # umount /stand 48 # dd if=/dev/rdsk/c0b0t0d0sa of=stand.img bs=512 49 50 Just in case, you can verify that you have done the right thing by checking 51 the magic number:: 52 53 # od -Ad -tx4 stand.img | more 54 55 The first 4 bytes should be 0x1badface. 56 57 If you have any patches, questions or suggestions regarding this BFS 58 implementation please contact the author: 59 60 Tigran Aivazian <aivazian.tigran@gmail.com>
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