misc/61400: Unmount md from CD fails.

[Peter Schmiedeskamp]

>Number:         61400
>Category:       misc
>Synopsis:       Unmount md from CD fails.
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 15 15:20:14 PST 2004
>Closed-Date:
>Last-Modified:
>Originator:     Peter Schmiedeskamp
>Release:        5.2-RELEASE
>Organization:
n/a
>Environment:
FreeBSD bsdbuilder.XXXXXXXXXXX 5.2-RELEASE FreeBSD 5.2-RELEASE #0: Sun Jan 11 04:21:45 GMT 2004     root at wv1u.btc.adaptec.com:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
When I mdconfig and mount a file that resides on a CD, I am unable to unconfigure that file or unmount the /dev/mdX device.  When these files reside elsewhere (not on a CD device), unmounting and unconfiguring an md device works as expected.
>How-To-Repeat:
bsdbuilder}~# umount /cdrom

bsdbuilder}~# mount /cdrom

bsdbuilder}~# cd /cdrom/floppies 

bsdbuilder}/cdrom/floppies# ls
CHECKSUM.MD5    README.TXT      drivers.flp     kern.flp
DRIVERS.TXT     boot.flp        fixit.flp       mfsroot.flp

bsdbuilder}/cdrom/floppies# mdconfig -a -t vnode -u 0 -f mfsroot.flp 

bsdbuilder}/cdrom/floppies# mount /dev/md0 /mnt/floppy

bsdbuilder}/cdrom/floppies# ls /mnt/floppy
.snap           mfsroot.gz

bsdbuilder}/cdrom/floppies# umount /mnt/floppy
umount: unmount of /mnt/floppy failed: Resource temporarily unavailable

bsdbuilder}/cdrom/floppies# mdconfig -d -u 0
mdconfig: ioctl(/dev/mdctl): Device busy

bsdbuilder}/cdrom/floppies# 

>Fix:
No fix is known.
>Release-Note:
>Audit-Trail:
>Unformatted: