NFSv2 directory cannot longer be exported in 3.14, 3.13 works fine

NFSv2 directory cannot longer be exported in 3.14, 3.13 works fine

[Toralf Förster]

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At a user mode linux image (32 bit Gentoo Linux) the recent kernel gives this error while trying to mount a NFSv2 directory:
mount.nfs: mount point /mnt/nfsv2 is not a directory      


The hostname is n22stab4, contents of the files follows.


/etc/fstab:
tmpfs                   /mnt/ramdisk    tmpfs   auto,size=300M
n22stab4:/mnt/ramdisk   /mnt/nfsv2      nfs     auto,bg,intr,soft,nfsvers=2


/etc/exports:
/mnt/ramdisk    192.168.0.0/16(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)


/var/log/messages:
Apr  4 23:55:45 n22stab4 kernel: init_special_inode: bogus i_mode (1777) for inode 0:24:818

- -- 
MfG/Sincerely
Toralf Förster
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Re: NFSv2 directory cannot longer be exported in 3.14, 3.13 works fine

[Toralf Förster]

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On 04/04/2014 11:57 PM, Toralf Förster wrote:
> At a user mode linux image (32 bit Gentoo Linux) the recent kernel gives this error while trying to mount a NFSv2 directory:
> mount.nfs: mount point /mnt/nfsv2 is not a directory
> 

A bisect points to :

6e14b46b91fee8a049b0940333ce13a820beaaa5 is the first bad commit
commit 6e14b46b91fee8a049b0940333ce13a820beaaa5
Author: Albert Fluegel <af@muc.de>
Date:   Mon Nov 18 12:18:01 2013 -0500

    nfsd: don't return high mode bits

    The Linux NFS server replies among other things to a "Check access permission"
    the following:

    NFS:    File type = 2 (Directory)
    NFS:    Mode = 040755

    A netapp server replies here:
    NFS:    File type = 2 (Directory)
    NFS:    Mode = 0755

    The RFC 1813 i read:
       fattr3

          struct fattr3 {
             ftype3     type;
             mode3      mode;
             uint32     nlink;
    ...
    For the mode bits only the lowest 9 are defined in the RFC

    As far as I can tell, knfsd has always done this, so apparently it's harmless.
    Nevertheless, it appears to be wrong.

    Note this is already correct in the NFSv4 case, only v2 and v3 need
    fixing.

    Signed-off-by: J. Bruce Fields <bfields@redhat.com>

:040000 040000 a60e55f5a9749db3977e12e8baa08d45fadba225 b982c02ec1069c5d969ccb71197e5569fe93b075 M fs

- -- 
MfG/Sincerely
Toralf Förster
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Re: NFSv2 directory cannot longer be exported in 3.14, 3.13 works fine

[Jeff Layton]

On Sat, 05 Apr 2014 14:17:27 +0200
Toralf Förster <toralf.foerster@gmx.de> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> On 04/04/2014 11:57 PM, Toralf Förster wrote:
> > At a user mode linux image (32 bit Gentoo Linux) the recent kernel gives this error while trying to mount a NFSv2 directory:
> > mount.nfs: mount point /mnt/nfsv2 is not a directory
> > 
> 
> A bisect points to :
> 
> 6e14b46b91fee8a049b0940333ce13a820beaaa5 is the first bad commit
> commit 6e14b46b91fee8a049b0940333ce13a820beaaa5
> Author: Albert Fluegel <af@muc.de>
> Date:   Mon Nov 18 12:18:01 2013 -0500
> 
>     nfsd: don't return high mode bits
> 
>     The Linux NFS server replies among other things to a "Check access permission"
>     the following:
> 
>     NFS:    File type = 2 (Directory)
>     NFS:    Mode = 040755
> 
>     A netapp server replies here:
>     NFS:    File type = 2 (Directory)
>     NFS:    Mode = 0755
> 
>     The RFC 1813 i read:
>        fattr3
> 
>           struct fattr3 {
>              ftype3     type;
>              mode3      mode;
>              uint32     nlink;
>     ...
>     For the mode bits only the lowest 9 are defined in the RFC
> 
>     As far as I can tell, knfsd has always done this, so apparently it's harmless.
>     Nevertheless, it appears to be wrong.
> 
>     Note this is already correct in the NFSv4 case, only v2 and v3 need
>     fixing.
> 
>     Signed-off-by: J. Bruce Fields <bfields@redhat.com>
> 
> :040000 040000 a60e55f5a9749db3977e12e8baa08d45fadba225 b982c02ec1069c5d969ccb71197e5569fe93b075 M fs
> 
> - -- 
> MfG/Sincerely
> Toralf Förster
> pgp finger print:1A37 6F99 4A9D 026F 13E2 4DCF C4EA CDDE 0076 E94E
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This was already tracked down earlier this week. Bruce has a patch
queued to fix it in his nfsd-next branch. See this thread from earlier
this week:

    Subject: Re: linux-3.14 nfsd regression

-- 
Jeff Layton <jlayton@redhat.com>

Re: NFSv2 directory cannot longer be exported in 3.14, 3.13 works fine

[Toralf Förster]

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On 04/05/2014 02:51 PM, Jeff Layton wrote:
> This was already tracked down earlier this week. Bruce has a patch 
> queued to fix it in his nfsd-next branch. See this thread from
> earlier this week:
> 
> Subject: Re: linux-3.14 nfsd regression
yep - fixed the issue here

- -- 
MfG/Sincerely
Toralf Förster
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