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Date: Mon, 16 Apr 2001 09:54:20 -0700 (PDT)
From: fredette@mit.edu
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/26618: unmount(2) can't unmount a filesystem whose device has been lost
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>Number:         26618
>Category:       kern
>Synopsis:       unmount(2) can't unmount a filesystem whose device has been lost
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Apr 16 10:00:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Matthew Fredette
>Release:        4.2_RELEASE
>Organization:
self
>Environment:
FreeBSD test1.home 4.2-RELEASE FreeBSD 4.2-RELEASE #7: Fri Apr 13 17:11:46 EDT 2001 root@home:/usr/src/sys/compile/TEST1  i386
>Description:
unmount(2) can't unmount a filesystem on a device that has been lost.
When the namei() call on the mountpoint fails with ENXIO, unmount
gives up and returns immediately.
>How-To-Repeat:
Mount a single filesystem read-only from a SCSI disk.  Power down
the disk, use 'camcontrol rescan' as appropriate to lose the device.
Now try to unmount the filesystem.
>Fix:
When namei() returns ENXIO on the mountpoint, umount could walk
the list of mounted filesystems looking for the mountpoint itself.
I'll attach a patch to this PR that does this in a followup email.
>Release-Note:
>Audit-Trail:
>Unformatted:

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