The following reply was made to PR kern/35457; it has been noted by GNATS.

From: Christian Biere <christianbiere@gmx.de>
To: gnats-bugs@NetBSD.org
Cc: netbsd-bugs@netbsd.org
Subject: Re: kern/35457: can't mount msdos fs on floppy anymore
Date: Sun, 21 Jan 2007 23:25:44 +0100

 > mount_msdos: /dev/fd0a on /mnt/tmp: Inappropriate ioctl for device
 > 
 > Tracing mount_msdos:
 > 
 >   5936  1 mount_msdos CALL  mount(0x8049222,0xbfbfebee,0,0xbfbfe964)
 >   5936  1 mount_msdos NAMI  "/mnt/tmp"
 >   5936  1 mount_msdos NAMI  "/dev/fd0a"
 >   5936  1 mount_msdos RET   mount -1 errno 25 Inappropriate ioctl for device
 
 I can't tell whether the following is a complete fix but it seems to restore
 the original behaviour with respect to floppies. I've checked it under qemu.
 
 --- /sys/fs/msdosfs/msdosfs_vfsops.c.orig	2006-12-26 15:47:02.000000000 +0100
 +++ /sys/fs/msdosfs/msdosfs_vfsops.c	2007-01-21 22:58:58.000000000 +0100
 @@ -428,6 +428,7 @@
  	u_int8_t SecPerClust;
  	int	ronly, error;
  	int	bsize = 0, dtype = 0, tmp;
 +	uint32_t p_size;
  
  	/* Flush out any old buffers remaining from a previous use. */
  	if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0)
 @@ -449,12 +450,20 @@
  	 * Let's root them out...
  	 */
  	error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, l);
 -	if (error)
 -		goto error_exit;
 -	if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
 +	if (error) {
 +		if (error != ENOTTY)
 +			goto error_exit;
 +		tmp = FS_MSDOS;
 +		dtype = DTYPE_FLOPPY;
 +		bsize = 512;
 +		p_size = -1;
 +	} else {
  		tmp   = dpart.part->p_fstype;
  		dtype = dpart.disklab->d_type;
  		bsize = dpart.disklab->d_secsize;
 +		p_size = dpart.part->p_size;
 +	}
 +	if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
  		if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
  			error = EINVAL;
  			goto error_exit;
 @@ -465,8 +474,7 @@
  	 * Read the boot sector of the filesystem, and then check the
  	 * boot signature.  If not a dos boot sector then error out.
  	 */
 -	if ((error = bread(devvp, 0, dpart.disklab->d_secsize, NOCRED,
 -	    &bp)) != 0)
 +	if ((error = bread(devvp, 0, bsize, NOCRED, &bp)) != 0)
  		goto error_exit;
  	bp->b_flags |= B_AGE;
  	bsp = (union bootsector *)bp->b_data;
 @@ -565,7 +573,7 @@
  		  || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
  		  || (pmp->pm_HugeSectors == 0)
  		  || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize)
 -							> dpart.part->p_size)
 +							> p_size)
  		   ) {
  			error = EINVAL;
  			goto error_exit;