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