TITLE: Supermount Hint LFS VERSION: ALL AUTHOR: Dave Watson SYNOPSIS: This hint explains how to get supermount and install it. Supermount is a kernel patch that allows one to use removable media without mounting/unmounting it. HINT: First off, a little background. As far as I know, the newest supermount that exists 'officially' is for version 2.4.0 of the kernel. There also exists a version for 2.4.5, ported by Jonas Berlin. Also, Mandrake has a version of supermount in their 8.1 relase, with kernel 2.4.8. These are the latest patches I could find, so you need to be using one of these kernel versions, or do the porting yourself. Update 20/4/03: Moritz Moeller-Herrmann says one can find patches for 2.4.20 kernels here: http://members.optusnet.com.au/ckolivas/kernel/ Update 14/5/02: Michael Monreal pointed out that supermount patches agains the linus' tree can be found at the address below for 2.4.18. Also, it seems -jp7 patchset has removed the supermount patch for the time being, the link is marked below as (old), so use the new link for the time being. Also noted that supermount should be added to the 2.5 tree soon. Update 20/3/02: Michael Wu was kind enough to let me know that there is now a new supermount available for kernel versions 2.4.18 (may work on other close relatives also). Download -------- You can download supermount here: 2.4.5 http://outerspace.dyndns.org/html/personal_pages/xkr47/kernel-patches/ 2.4.0 http://www.geocities.com/alexismikhailov/supermount.html 2.4.8 http://www.linux-mandrake.com/ 2.4.18 (old) http://infolinux.de/jp7 2.4.18 http://people.mandrakesoft.com/~quintela/supermount/ 2.4.20 http://members.optusnet.com.au/ckolivas/kernel/004_supermount_030408_ck_2.4.20.patch.bz2 As far as I know Mandrake has not released a seperate patch for the 2.4.8 kernel, so the whole Mandrake linux kernel must be used. Personally I use kernel 2.4.18. New kernels can be gotten here: http://www.kernel.org/ Make sure you download the correct version. Installation ------------ Unpack the kernel somewhere under /usr/src, just like you did for the book. For this example, we'll be using /usr/src/linux-2.4.5. Put the supermount patch in /usr/src. After the kernel is unpacked, change into the directory: cd /usr/src/linux-2.4.5 Then, apply the supermount patch... Kernels 2.4.5 and earlier: patch -Np1 -i ../supermount-0.5.3-2.4.5.diff Kernel 2.4.18 and newer: [new] Apply all patches at the web-address given above that pertain to your kernel version (either 2.4.18 or 2.4.18-pre8). [jp7 -- old] You need the jp7 patchset, and after bunzip *bz2 in the patchset directory, you need to install patches 22-27, or all of them, to make it work. Something like this should work to apply all the patchs: patch -p1<../directory/to/patches/[00-99]* Finally, follow the kernel installation as in the lfs book, but make sure you enable the option 'Supermount removable media support' under 'file systems' when you configure the kernel. After you build/install the kernel, your'e done! Configuration ------------- The only file you should need to edit is /etc/fstab. To enable supermount support for a cdrom, do something like this: /dev/hdc /mnt/cdrom supermount fs=iso9660,dev=/dev/hdc 0 0 This will mount device hdc on /mnt/cdrom (this directory must exist), using the supermount file system, allow users to mount/umount it (no su'ing needed), tell supermount to mount using iso9660 filesystem, and then tell supermount where the device is. This is only an example, change the paramaters to your needs. Here is another example for a floppy: /dev/fd0 /mnt/floppy supermount fs=vfat,dev=/dev/fd0 0 0 Same as before, but use fd0, mount on /mnt/floppy, and use the vfat filesystem. More detailes on exactly what options can be passed are available under the kernel tree in Documentation/filesystems/supermount.txt, after the tree has been patched. Using ----- Simple. After you have everything set up correctly, simply change to /mnt/cdrom, or any directory you specified in /etc/fstab, and if there is media in the drive it will be automatically mounted. Unmounting is even more simple....just eject the cd or floppy! Commands such as cp or mv will not return until they finish with the write, so as long as no commands are running on the device, it is ok to remove them. Corrections ----------- If you notice something wrong here, please let djwatson@u.washington.edu know so that he can fix it. I personally have only tested supermount on kernels 2.4.5 and 2.4.18, so I know both of these work. I have also seen a working Mandrake distro, and I know it works there...but I haven't tested it myself. Thanks ------ Michael Monreal for letting my know about 2.4.18 version for linus' kernel. Michael Wu for letting me know about 2.4.18-jp7 supermount version.