Bug 52403 - exportfs -u doesn't work
exportfs -u doesn't work
Product: Red Hat Linux
Classification: Retired
Component: nfs-utils (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Pete Zaitcev
Brian Brock
Depends On:
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Reported: 2001-08-23 11:55 EDT by Marty Shannon
Modified: 2007-04-18 12:36 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2004-04-19 11:57:06 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Marty Shannon 2001-08-23 11:55:16 EDT
Description of Problem:
exportfs -u fails to unexport a previously exported filesystem

Version-Release number of selected component (if applicable):

How Reproducible:

Steps to Reproduce:
1. add "/mnt/cdrom *" to /etc/exports
2. exportfs -a
3. on client, "mount server:/mnt/cdrom /mnt/s-cdrom"
4. on client, "du /mnt/s-cdrom"
5. on client, "umount /mnt/s-cdrom"
6. on server, "exportfs -u client:/home/test"
7. on server, "umount /mnt/cdrom"

Actual Results:
step 7 fails because step 6 actually failed to remove the entry from the
kernel's table, so the kernel still has (presumably the root inode) still
open, preventing the umount from succeeding

Expected Results:
step 7 should succeed, because step 6 should tell the kernel to let go

Additional Information:
If (after step 7) you comment out the line added in step 1, then execute
"exportfs -r", re-executing step 7 works as expected, so there is something
 done correctly by the "-r" path that is not being done in the "-u" path.
Comment 1 Bob Matthews 2001-08-23 15:04:43 EDT
It appears as if mountd is honoring UMOUNT requests from clients, but not
notifying the server's kernel that the exported directory is no longer in use. 
This is also reflected in /var/lib/nfs/rmtab, which is supposed to list those
file systems which mountd currently thinks are mounted by clients.

Your workaround ("exportfs -r") must force rpc.mountd to rebuild it's list and
notify the kernel.

I will notify the nfs-utils maintainers.
Comment 2 Glen Foster 2001-08-24 13:08:34 EDT
This defect is considered SHOULD-FIX for Fairfax.
Comment 3 Pete Zaitcev 2004-04-19 11:57:06 EDT
The bug fell over the horizon due to manpower constraints, closing.
If Fedora still fails to unexport, please refile.

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