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Bug 609097 - mount -o remount <cifs> creates additional entries in /etc/mtab
mount -o remount <cifs> creates additional entries in /etc/mtab
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: samba (Show other bugs)
All Linux
low Severity medium
: rc
: ---
Assigned To: Jeff Layton
Depends On:
Blocks: 770004 1109448
  Show dependency treegraph
Reported: 2010-06-29 08:32 EDT by Brett Maton
Modified: 2014-06-18 03:40 EDT (History)
5 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 770004 (view as bug list)
Last Closed: 2012-01-10 15:22:07 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Brett Maton 2010-06-29 08:32:44 EDT
Description of problem:

If you remount a cifs file share an additional entry is added to /etc/mtab instead of updating the existing entry. 

/proc/mounts is correct however. 

The problem/confusion is that if you run mount -v to view current mounted volumes you'll get the extras from /etc/mtab displayed. 

If you try to umount these spurious volumes you'll get an error something like: 

This utility only unmounts cifs filesystems. 
This utility only unmounts cifs filesystems. 

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


How reproducible:
Every time

Steps to Reproduce:
1. mount -v
//cifs_server/my_share  /mnt/my_share

2. mount -o remount /mnt/my_share

3. mount -v
//cifs_server/my_share  /mnt/my_share
//cifs_server/my_share  /mnt/my_share
Actual results:

Additional entry added to /etc/mtab

Expected results:

Existing entry should have been updated

Additional info:

/proc/mounts  contains correct mount information.
Comment 1 Karel Zak 2010-06-29 09:14:22 EDT
Reassigning to samba, mount(8) does not update the mtab file, it calls /sbin/mount.cifs.
Comment 2 Brett Maton 2010-07-08 07:45:47 EDT
This is causing automated tools that check the output of mount -v to fail.

Severity raised from low ot medium.
Comment 3 Brett Maton 2010-08-06 03:58:56 EDT
Anything happening with regards to this bug?
Comment 4 Jeff Layton 2010-08-06 07:18:25 EDT
FWIW, -o remount is a noop for CIFS. In fact, this command probably ought to return an error. I'll see about pushing something upstream when I have time.
Comment 5 Brett Maton 2010-08-09 08:20:13 EDT
This issue also occurs on Red Hat Enterprise Linux Server release 5.5 (Tikanga)
Comment 6 Tru Huynh 2010-10-06 09:12:45 EDT
Comment 7 Jeff Layton 2012-01-10 15:22:07 EST
There's a patch in progress for this upstream by Carlos Maolino, but I don't think this is probably going to meet the criticality threshold for RHEL4. I'm going to close this WONTFIX. If you want to make a case for backporting this to RHEL4, then please open a RH support case and request that this be reopened.

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