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Bug 520092

Summary: statfs on NFS partition always returns 0
Product: Red Hat Enterprise Linux 4 Reporter: Jeff Layton <jlayton>
Component: kernelAssignee: Jeff Layton <jlayton>
Status: CLOSED DUPLICATE QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: high Docs Contact:
Priority: high    
Version: 4.8CC: rwheeler, staubach, steved, tao, tumeya
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 519112 Environment:
Last Closed: 2009-09-01 20:09:33 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 519112    
Bug Blocks:    

Description Jeff Layton 2009-08-28 10:40:54 UTC 
+++ This bug was initially created as a clone of Bug #519112 +++

Escalated to Bugzilla from IssueTracker

--- Additional comment from tumeya on 2009-08-25 04:36:48 EDT ---

Description of problem:
statfs on NFS partition always returns 0 regardless of success/fail. 

Steps to Reproduce:
1. Start NFS service:
    # echo "/test        *(rw,no_root_squash)" >> /etc/exports
    # service nfs start
2. Setup client:
    # mount -t nfs -o soft,timeo=5 server:/test /mnt/nfs
3. Stop NFS service:
    # service nfs stop
4. From the client, run the attached test program:

Actual results:
The program returns with 0, which actually should return negative number according to statfs(2) but returns 0. 

Expected results: 
Should return negative number. 

According to the call trace nfs_statfs is not returning the value properly. 
sys_statfs() => return 0
  vfs_statfs() => return 0
    nfs_statfs() => return 0
      nfs3_proc_statfs() => return -5

The patch is already upstream: 
1a0ba9ae485c5fd17d0bff2f14d9dd75b8985593

--- Additional comment from tumeya on 2009-08-25 04:40:03 EDT ---

Created an attachment (id=358536)
proposed patch

--- Additional comment from tumeya on 2009-08-25 04:51:55 EDT ---

Created an attachment (id=358538)
reproducer code

--- Additional comment from jlayton on 2009-08-28 06:39:36 EDT ---

I've added the above patch to my test kernels:

http://people.redhat.com/jlayton

...if you or they are able to test it and verify that it works, then that would be helpful.
Comment 1 Jeff Layton 2009-09-01 20:09:33 UTC 
Cloned this bug by accident. Closing as not

*** This bug has been marked as a duplicate of bug 520018 ***