RFC: [2.6 patch] remove UMSDOS

RFC: [2.6 patch] remove UMSDOS

[Adrian Bunk]

UMSDOS in 2.6 is broken, and it seems noone needs it enough to bother 
fixing it.

I'd suggest the patch below to remove UMSDOS.


diffstat output:
 Documentation/filesystems/00-INDEX |    2 -
 MAINTAINERS                        |    7 ----
 fs/Kconfig                         |   46 +----------------------------
 fs/Makefile                        |    1 
 4 files changed, 2 insertions(+), 54 deletions(-)

Additionally, the following commands are required:
  rm -r fs/umsdos
  rm include/linux/umsdos_fs.h
  rm include/linux/umsdos_fs.p
  rm include/linux/umsdos_fs_i.h
  rm Documentation/filesystems/umsdos.txt


Signed-off-by: Adrian Bunk <bunk@fs.tum.de>

--- linux-2.6.7-mm7-full/MAINTAINERS.old	2004-07-11 13:15:24.000000000 +0200
+++ linux-2.6.7-mm7-full/MAINTAINERS	2004-07-11 13:15:47.000000000 +0200
@@ -2127,13 +2127,6 @@
 W:	http://linux-udf.sourceforge.net
 S:	Maintained
 
-UMSDOS FILESYSTEM
-P:	Matija Nalis
-M:	Matija Nalis <mnalis-umsdos@voyager.hr>
-L:	linux-kernel@vger.kernel.org
-W:	http://linux.voyager.hr/umsdos/
-S:	Maintained
-
 UNIFORM CDROM DRIVER
 P:	Jens Axboe
 M:	axboe@suse.de
--- linux-2.6.7-mm7-full/fs/Kconfig.old	2004-07-11 13:15:24.000000000 +0200
+++ linux-2.6.7-mm7-full/fs/Kconfig	2004-07-11 13:19:08.000000000 +0200
@@ -555,9 +555,8 @@
 	tristate "DOS FAT fs support"
 	select NLS
 	help
-	  If you want to use one of the FAT-based file systems (the MS-DOS,
-	  VFAT (Windows 95) and UMSDOS (used to run Linux on top of an
-	  ordinary DOS partition) file systems), then you must say Y or M here
+	  If you want to use one of the FAT-based file systems (MS-DOS
+	  and VFAT (Windows 95)) then you must say Y or M here
 	  to include FAT support. You will then be able to mount partitions or
 	  diskettes with FAT-based file systems and transparently access the
 	  files on them, i.e. MSDOS files will look and behave just like all
@@ -589,9 +588,6 @@
 	  fat.  Note that if you compile the FAT support as a module, you
 	  cannot compile any of the FAT-based file systems into the kernel
 	  -- they will have to be modules as well.
-	  The file system of your root partition (the one containing the
-	  directory /) cannot be a module, so don't say M here if you intend
-	  to use UMSDOS as your root file system.
 
 config MSDOS_FS
 	tristate "MSDOS fs support"
@@ -608,10 +604,6 @@
 	  transparent, i.e. the MSDOS files look and behave just like all
 	  other Unix files.
 
-	  If you want to use UMSDOS, the Unix-like file system on top of a
-	  DOS file system, which allows you to run Linux from within a DOS
-	  partition without repartitioning, you'll have to say Y or M here.
-
 	  If you have Windows 95 or Windows NT installed on your MSDOS
 	  partitions, you should use the VFAT file system (say Y to "VFAT fs
 	  support" below), or you will not be able to see the long filenames
@@ -631,11 +623,6 @@
 	  used by Windows 95, Windows 98, Windows NT 4.0, and the Unix
 	  programs from the mtools package.
 
-	  You cannot use the VFAT file system for your Linux root partition
-	  (the one containing the directory /); use UMSDOS instead if you
-	  want to run Linux from within a DOS partition (i.e. say Y to
-	  "Unix like fs on top of std MSDOS fs", below).
-
 	  The VFAT support enlarges your kernel by about 10 KB and it only
 	  works if you said Y to the "DOS FAT fs support" above.  Please read
 	  the file <file:Documentation/filesystems/vfat.txt> for details.  If
@@ -663,35 +650,6 @@
 	  mount option for FAT filesystems.  Note that UTF8 is *not* a
 	  supported charset for FAT filesystems.
 
-config UMSDOS_FS
-#dep_tristate '    UMSDOS: Unix-like file system on top of standard MSDOS fs' CONFIG_UMSDOS_FS $CONFIG_MSDOS_FS
-# UMSDOS is temprory broken
-	bool
-	help
-	  Say Y here if you want to run Linux from within an existing DOS
-	  partition of your hard drive. The advantage of this is that you can
-	  get away without repartitioning your hard drive (which often implies
-	  backing everything up and restoring afterwards) and hence you're
-	  able to quickly try out Linux or show it to your friends; the
-	  disadvantage is that Linux becomes susceptible to DOS viruses and
-	  that UMSDOS is somewhat slower than ext2fs.  Another use of UMSDOS
-	  is to write files with long unix filenames to MSDOS floppies; it
-	  also allows Unix-style soft-links and owner/permissions of files on
-	  MSDOS floppies.  You will need a program called umssync in order to
-	  make use of UMSDOS; read
-	  <file:Documentation/filesystems/umsdos.txt>.
-
-	  To get utilities for initializing/checking UMSDOS file system, or
-	  latest patches and/or information, visit the UMSDOS home page at
-	  <http://www.voyager.hr/~mnalis/umsdos/>.
-
-	  This option enlarges your kernel by about 28 KB and it only works if
-	  you said Y to both "DOS FAT fs support" and "MSDOS fs support"
-	  above.  To compile this as a module, choose M here: the module will be
-	  called umsdos.  Note that the file system of your root partition
-	  (the one containing the directory /) cannot be a module, so saying M
-	  could be dangerous.  If unsure, say N.
-
 config NTFS_FS
 	tristate "NTFS file system support"
 	select NLS
--- linux-2.6.7-mm7-full/fs/Makefile.old	2004-07-11 13:15:24.000000000 +0200
+++ linux-2.6.7-mm7-full/fs/Makefile	2004-07-11 13:17:26.000000000 +0200
@@ -55,7 +55,6 @@
 obj-$(CONFIG_CODA_FS)		+= coda/
 obj-$(CONFIG_MINIX_FS)		+= minix/
 obj-$(CONFIG_FAT_FS)		+= fat/
-obj-$(CONFIG_UMSDOS_FS)		+= umsdos/
 obj-$(CONFIG_MSDOS_FS)		+= msdos/
 obj-$(CONFIG_VFAT_FS)		+= vfat/
 obj-$(CONFIG_BFS_FS)		+= bfs/
--- linux-2.6.7-mm7-full/Documentation/filesystems/00-INDEX.old	2004-07-11 13:15:24.000000000 +0200
+++ linux-2.6.7-mm7-full/Documentation/filesystems/00-INDEX	2004-07-11 13:17:31.000000000 +0200
@@ -42,8 +42,6 @@
 	- info and mount options for the UDF filesystem.
 ufs.txt
 	- info on the ufs filesystem.
-umsdos.txt
-	- info on the umsdos extensions to the msdos filesystem.
 vfat.txt
 	- info on using the VFAT filesystem used in Windows NT and Windows 95
 vfs.txt

Re: RFC: [2.6 patch] remove UMSDOS

[Jeff Woods]

At 7/11/2004 01:28 PM +0200, Adrian Bunk wrote:
>UMSDOS in 2.6 is broken, and it seems no one needs it enough to bother 
>fixing it.

Once upon a time, everyone using any Microsoft OS used FAT, but with the 
proliferation of Windows 2000 and XP, NTFS is becoming much more 
common.  (And note that Windows folks most likely to benefit from a 
mechanism like UMSDOS are also more likely to be using NTFS rather than 
FAT.) At the same time, the need to run Linux on a system with all the disc 
space allocated for Windows is being met by Knoppix, VMware, and similar 
techniques rather than the relative kludge of actually installing Linux on 
a FAT filesystem. The days of UMSDOS are behind us.

--
Jeff Woods <kazrak+kernel@cesmail.net> 

Re: RFC: [2.6 patch] remove UMSDOS

[H. Peter Anvin]

Followup to:  <6.1.1.1.0.20040711120748.041c8e60@no.incoming.mail>
By author:    Jeff Woods <Kazrak+kernel@cesmail.net>
In newsgroup: linux.dev.kernel
>
> At 7/11/2004 01:28 PM +0200, Adrian Bunk wrote:
> >UMSDOS in 2.6 is broken, and it seems no one needs it enough to bother 
> >fixing it.
> 
> Once upon a time, everyone using any Microsoft OS used FAT, but with the 
> proliferation of Windows 2000 and XP, NTFS is becoming much more 
> common.  (And note that Windows folks most likely to benefit from a 
> mechanism like UMSDOS are also more likely to be using NTFS rather than 
> FAT.) At the same time, the need to run Linux on a system with all the disc 
> space allocated for Windows is being met by Knoppix, VMware, and similar 
> techniques rather than the relative kludge of actually installing Linux on 
> a FAT filesystem. The days of UMSDOS are behind us.
> 

Realistically I think it's VFAT that killed it.

	-hpa

Re: RFC: [2.6 patch] remove UMSDOS

[mnalis]

On Sun, Jul 11, 2004 at 12:17:32PM -0600, Jeff Woods wrote:
> At 7/11/2004 01:28 PM +0200, Adrian Bunk wrote:
> >UMSDOS in 2.6 is broken, and it seems no one needs it enough to bother 
> >fixing it.

Just to notify anybody interested that I have started working on fixing
UMSDOS support for 2.6 kernels (as there still seems to be some people
wanting it). 

Patch that enables UMSDOS to compile and insmod is available at 
http://linux.voyager.hr/umsdos/
It still doesn't work (triggers kernel BUG() after few write ops), 
but I'll post another announcements when I get it in working condition.


-- 
Opinions above are GNU-copylefted.

Re: RFC: [2.6 patch] remove UMSDOS

[Randy.Dunlap]

On Sat, 24 Jul 2004 20:26:27 +0200 mnalis@voyager.hr wrote:

| On Sun, Jul 11, 2004 at 12:17:32PM -0600, Jeff Woods wrote:
| > At 7/11/2004 01:28 PM +0200, Adrian Bunk wrote:
| > >UMSDOS in 2.6 is broken, and it seems no one needs it enough to bother 
| > >fixing it.
| 
| Just to notify anybody interested that I have started working on fixing
| UMSDOS support for 2.6 kernels (as there still seems to be some people
| wanting it). 
| 
| Patch that enables UMSDOS to compile and insmod is available at 
| http://linux.voyager.hr/umsdos/
| It still doesn't work (triggers kernel BUG() after few write ops), 
| but I'll post another announcements when I get it in working condition.

I posted a umsdos patch (to build on 2.6.0-test) last October/2003.
See http://marc.theaimsgroup.com/?l=linux-fsdevel&m=106697862024272&w=2
and see Al Viro's reply to that.

Anyway, I just updated my patch to build on 2.6.8-rc2-bk8, so my patch
is quite similar to yours now.  Yours is a small bit ahead of mine.

  http://developer.osdl.org/rddunlap/patches/umsdos-build-268rc2bk8.patch

--
~Randy