Bug 52403

Summary: exportfs -u doesn't work
Product: [Retired] Red Hat Linux Reporter: Marty Shannon <martys>
Component: nfs-utilsAssignee: Pete Zaitcev <zaitcev>
Status: CLOSED WONTFIX QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.3   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2004-04-19 15:57:06 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Marty Shannon 2001-08-23 15:55:16 UTC 
Description of Problem:
exportfs -u fails to unexport a previously exported filesystem

Version-Release number of selected component (if applicable):
0.3.1-12

How Reproducible:
100%

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 19:04:43 UTC 
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 17:08:34 UTC 
This defect is considered SHOULD-FIX for Fairfax.
Comment 3 Pete Zaitcev 2004-04-19 15:57:06 UTC 
The bug fell over the horizon due to manpower constraints, closing.
If Fedora still fails to unexport, please refile.