[PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[Bas Peters]

This patch adds a missing conditional group that has been causing build
breakages due to undefined struct members being referenced when
CONFIG_NFSD_v3 is not set.

This patch applies against linux-next.

Signed-off-by: Bas Peters <baspeters93@gmail.com>
---
 fs/nfsd/xdr4.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 0bda93e..5d1597f 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -630,9 +630,11 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op);
 static inline void
 set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
 {
+	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
+
+#ifdef CONFIG_NFSD_V3
 	BUG_ON(!fhp->fh_pre_saved);
 	cinfo->atomic = fhp->fh_post_saved;
-	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
 
 	cinfo->before_change = fhp->fh_pre_change;
 	cinfo->after_change = fhp->fh_post_change;
@@ -640,7 +642,7 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
 	cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
 	cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
 	cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
-
+#endif
 }
 
 int nfs4svc_encode_voidres(struct svc_rqst *, __be32 *, void *);
-- 
2.1.0

Re: [PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[Guenter Roeck]

On Thu, Feb 12, 2015 at 11:09:13PM +0100, Bas Peters wrote:
> This patch adds a missing conditional group that has been causing build
> breakages due to undefined struct members being referenced when
> CONFIG_NFSD_v3 is not set.
> 
> This patch applies against linux-next.
> 
> Signed-off-by: Bas Peters <baspeters93-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  fs/nfsd/xdr4.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> index 0bda93e..5d1597f 100644
> --- a/fs/nfsd/xdr4.h
> +++ b/fs/nfsd/xdr4.h
> @@ -630,9 +630,11 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op);
>  static inline void
>  set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
>  {
> +	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
> +
> +#ifdef CONFIG_NFSD_V3
>  	BUG_ON(!fhp->fh_pre_saved);
>  	cinfo->atomic = fhp->fh_post_saved;
> -	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
>  
>  	cinfo->before_change = fhp->fh_pre_change;
>  	cinfo->after_change = fhp->fh_post_change;
> @@ -640,7 +642,7 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
>  	cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
>  	cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
>  	cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
> -
> +#endif
>  }

You'll want to include and example of the build failure in the description,
bisect results after the '---' line, and a Fixes: line pointing to the patch
breaking the build.

In this case, I am not sure if the above really fixes the problem,
or if it just hides it behind an #ifdef. To determine that, it will
probably be necessary to know which patch actually caused the problem.
This even more true since the code in question was not changed since 
around 2010, so making it conditional looks really suspicious.

In the curent case, I suspect that the problem may have been introduced by
commit 9cf514ccfac ("nfsd: implement pNFS operations"). That is just a guess,
though; I didn't run bisect myself. The key really is to figure out why the
code now fails to build, and not just to comment out the code that is causing
the failure.

Thanks,
Guenter
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Re: [PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[J. Bruce Fields]

On Thu, Feb 12, 2015 at 03:02:01PM -0800, Guenter Roeck wrote:
> On Thu, Feb 12, 2015 at 11:09:13PM +0100, Bas Peters wrote:
> > This patch adds a missing conditional group that has been causing build
> > breakages due to undefined struct members being referenced when
> > CONFIG_NFSD_v3 is not set.
> > 
> > This patch applies against linux-next.
> > 
> > Signed-off-by: Bas Peters <baspeters93-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > ---
> >  fs/nfsd/xdr4.h | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> > index 0bda93e..5d1597f 100644
> > --- a/fs/nfsd/xdr4.h
> > +++ b/fs/nfsd/xdr4.h
> > @@ -630,9 +630,11 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op);
> >  static inline void
> >  set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
> >  {
> > +	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
> > +
> > +#ifdef CONFIG_NFSD_V3
> >  	BUG_ON(!fhp->fh_pre_saved);
> >  	cinfo->atomic = fhp->fh_post_saved;
> > -	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
> >  
> >  	cinfo->before_change = fhp->fh_pre_change;
> >  	cinfo->after_change = fhp->fh_post_change;
> > @@ -640,7 +642,7 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
> >  	cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
> >  	cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
> >  	cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
> > -
> > +#endif
> >  }
> 
> You'll want to include and example of the build failure in the description,
> bisect results after the '---' line, and a Fixes: line pointing to the patch
> breaking the build.
> 
> In this case, I am not sure if the above really fixes the problem,
> or if it just hides it behind an #ifdef. To determine that, it will
> probably be necessary to know which patch actually caused the problem.
> This even more true since the code in question was not changed since 
> around 2010, so making it conditional looks really suspicious.
> 
> In the curent case, I suspect that the problem may have been introduced by
> commit 9cf514ccfac ("nfsd: implement pNFS operations"). That is just a guess,
> though; I didn't run bisect myself. The key really is to figure out why the
> code now fails to build, and not just to comment out the code that is causing
> the failure.

Yeah, when Jim Davis reported this I took a quick look at the history,
didn't see an obvious explanation, and figured well maybe this is just
the first time anyone's hit that particular config in a while.  Sounds
like this actually is a recent regression?

--b.
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Re: [PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[Guenter Roeck]

On 02/13/2015 06:51 AM, J. Bruce Fields wrote:
> On Thu, Feb 12, 2015 at 03:02:01PM -0800, Guenter Roeck wrote:
>> On Thu, Feb 12, 2015 at 11:09:13PM +0100, Bas Peters wrote:
>>> This patch adds a missing conditional group that has been causing build
>>> breakages due to undefined struct members being referenced when
>>> CONFIG_NFSD_v3 is not set.
>>>
>>> This patch applies against linux-next.
>>>
>>> Signed-off-by: Bas Peters <baspeters93@gmail.com>
>>> ---
>>>   fs/nfsd/xdr4.h | 6 ++++--
>>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
>>> index 0bda93e..5d1597f 100644
>>> --- a/fs/nfsd/xdr4.h
>>> +++ b/fs/nfsd/xdr4.h
>>> @@ -630,9 +630,11 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op);
>>>   static inline void
>>>   set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
>>>   {
>>> +	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
>>> +
>>> +#ifdef CONFIG_NFSD_V3
>>>   	BUG_ON(!fhp->fh_pre_saved);
>>>   	cinfo->atomic = fhp->fh_post_saved;
>>> -	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
>>>
>>>   	cinfo->before_change = fhp->fh_pre_change;
>>>   	cinfo->after_change = fhp->fh_post_change;
>>> @@ -640,7 +642,7 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
>>>   	cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
>>>   	cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
>>>   	cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
>>> -
>>> +#endif
>>>   }
>>
>> You'll want to include and example of the build failure in the description,
>> bisect results after the '---' line, and a Fixes: line pointing to the patch
>> breaking the build.
>>
>> In this case, I am not sure if the above really fixes the problem,
>> or if it just hides it behind an #ifdef. To determine that, it will
>> probably be necessary to know which patch actually caused the problem.
>> This even more true since the code in question was not changed since
>> around 2010, so making it conditional looks really suspicious.
>>
>> In the curent case, I suspect that the problem may have been introduced by
>> commit 9cf514ccfac ("nfsd: implement pNFS operations"). That is just a guess,
>> though; I didn't run bisect myself. The key really is to figure out why the
>> code now fails to build, and not just to comment out the code that is causing
>> the failure.
>
> Yeah, when Jim Davis reported this I took a quick look at the history,
> didn't see an obvious explanation, and figured well maybe this is just
> the first time anyone's hit that particular config in a while.  Sounds
> like this actually is a recent regression?
>

It was intruduced by 9cf514ccfac. Problem is that xdr4.h is only supposed to
be used and included by NFSv4 code but is now included even if NFSv3 and/or
NFSv4 are not configured. The variables in fhp accessed above do not exist
unless NFSv3 is configured.

The patch here is therefore really just a kludge, though I don't really know
an easy real fix.

If you ask me, I'd say that 9cf514ccfac was rushed into mainline a bit.
It showed up in next on Feb 10 and pushed into mainline just a day or two
later. Result is that every build with NFS configured but not NSFv3 is
now broken.

Guenter

Re: [PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[J. Bruce Fields]

On Fri, Feb 13, 2015 at 08:52:57AM -0800, Guenter Roeck wrote:
> On 02/13/2015 06:51 AM, J. Bruce Fields wrote:
> >On Thu, Feb 12, 2015 at 03:02:01PM -0800, Guenter Roeck wrote:
> >>On Thu, Feb 12, 2015 at 11:09:13PM +0100, Bas Peters wrote:
> >>>This patch adds a missing conditional group that has been causing build
> >>>breakages due to undefined struct members being referenced when
> >>>CONFIG_NFSD_v3 is not set.
> >>>
> >>>This patch applies against linux-next.
> >>>
> >>>Signed-off-by: Bas Peters <baspeters93@gmail.com>
> >>>---
> >>>  fs/nfsd/xdr4.h | 6 ++++--
> >>>  1 file changed, 4 insertions(+), 2 deletions(-)
> >>>
> >>>diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> >>>index 0bda93e..5d1597f 100644
> >>>--- a/fs/nfsd/xdr4.h
> >>>+++ b/fs/nfsd/xdr4.h
> >>>@@ -630,9 +630,11 @@ void warn_on_nonidempotent_op(struct nfsd4_op *op);
> >>>  static inline void
> >>>  set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
> >>>  {
> >>>+	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
> >>>+
> >>>+#ifdef CONFIG_NFSD_V3
> >>>  	BUG_ON(!fhp->fh_pre_saved);
> >>>  	cinfo->atomic = fhp->fh_post_saved;
> >>>-	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
> >>>
> >>>  	cinfo->before_change = fhp->fh_pre_change;
> >>>  	cinfo->after_change = fhp->fh_post_change;
> >>>@@ -640,7 +642,7 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
> >>>  	cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
> >>>  	cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
> >>>  	cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
> >>>-
> >>>+#endif
> >>>  }
> >>
> >>You'll want to include and example of the build failure in the description,
> >>bisect results after the '---' line, and a Fixes: line pointing to the patch
> >>breaking the build.
> >>
> >>In this case, I am not sure if the above really fixes the problem,
> >>or if it just hides it behind an #ifdef. To determine that, it will
> >>probably be necessary to know which patch actually caused the problem.
> >>This even more true since the code in question was not changed since
> >>around 2010, so making it conditional looks really suspicious.
> >>
> >>In the curent case, I suspect that the problem may have been introduced by
> >>commit 9cf514ccfac ("nfsd: implement pNFS operations"). That is just a guess,
> >>though; I didn't run bisect myself. The key really is to figure out why the
> >>code now fails to build, and not just to comment out the code that is causing
> >>the failure.
> >
> >Yeah, when Jim Davis reported this I took a quick look at the history,
> >didn't see an obvious explanation, and figured well maybe this is just
> >the first time anyone's hit that particular config in a while.  Sounds
> >like this actually is a recent regression?
> >
> 
> It was intruduced by 9cf514ccfac. Problem is that xdr4.h is only supposed to
> be used and included by NFSv4 code but is now included even if NFSv3 and/or
> NFSv4 are not configured. The variables in fhp accessed above do not exist
> unless NFSv3 is configured.
> 
> The patch here is therefore really just a kludge, though I don't really know
> an easy real fix.
> 
> If you ask me, I'd say that 9cf514ccfac was rushed into mainline a bit.
> It showed up in next on Feb 10 and pushed into mainline just a day or two
> later.

Blame me for that decision.

> Result is that every build with NFS configured but not NSFv3 is
> now broken.

Fortunately a v2-only server would be pretty unusual these days.

I don't know, maybe this?

--b.

commit 535c381153631af3bc708a97e267a2a6a86ee030
Author: J. Bruce Fields <bfields@redhat.com>
Date:   Fri Feb 13 12:27:39 2015 -0500

    nfsd4: fix v3-less build
    
    Includes of pnfs.h in export.c and fcntl.c also bring in xdr4.h, which
    won't build without CONFIG_NFSD_V3, breaking non-V3 builds.  Ifdef-out
    most of pnfs.h in that case.
    
    Reported-by: Bas Peters <baspeters93@gmail.com>
    Reported-by: Jim Davis <jim.epost@gmail.com>
    Fixes: 9cf514ccfac "nfsd: implement pNFS operations"
    Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/pnfs.h b/fs/nfsd/pnfs.h
index fedb4d6..d4c4453 100644
--- a/fs/nfsd/pnfs.h
+++ b/fs/nfsd/pnfs.h
@@ -1,6 +1,7 @@
 #ifndef _FS_NFSD_PNFS_H
 #define _FS_NFSD_PNFS_H 1
 
+#ifdef CONFIG_NFSD_V4
 #include <linux/exportfs.h>
 #include <linux/nfsd/export.h>
 
@@ -50,6 +51,7 @@ __be32 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
 int nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
 		u32 device_generation);
 struct nfsd4_deviceid_map *nfsd4_find_devid_map(int idx);
+#endif /* CONFIG_NFSD_V4 */
 
 #ifdef CONFIG_NFSD_PNFS
 void nfsd4_setup_layout_type(struct svc_export *exp);
@@ -59,6 +61,9 @@ void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
 int nfsd4_init_pnfs(void);
 void nfsd4_exit_pnfs(void);
 #else
+struct nfs4_client;
+struct nfs4_file;
+
 static inline void nfsd4_setup_layout_type(struct svc_export *exp)
 {
 }

Re: [PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[Guenter Roeck]

On 02/13/2015 09:33 AM, J. Bruce Fields wrote:

>> Result is that every build with NFS configured but not NSFv3 is
>> now broken.
>
> Fortunately a v2-only server would be pretty unusual these days.
>
> I don't know, maybe this?
>
I applied the patch below on top of current mainline and passed it
to my build farm. I'll let you know how it goes.

Guenter

> --b.
>
> commit 535c381153631af3bc708a97e267a2a6a86ee030
> Author: J. Bruce Fields <bfields@redhat.com>
> Date:   Fri Feb 13 12:27:39 2015 -0500
>
>      nfsd4: fix v3-less build
>
>      Includes of pnfs.h in export.c and fcntl.c also bring in xdr4.h, which
>      won't build without CONFIG_NFSD_V3, breaking non-V3 builds.  Ifdef-out
>      most of pnfs.h in that case.
>
>      Reported-by: Bas Peters <baspeters93@gmail.com>
>      Reported-by: Jim Davis <jim.epost@gmail.com>
>      Fixes: 9cf514ccfac "nfsd: implement pNFS operations"
>      Signed-off-by: J. Bruce Fields <bfields@redhat.com>
>
> diff --git a/fs/nfsd/pnfs.h b/fs/nfsd/pnfs.h
> index fedb4d6..d4c4453 100644
> --- a/fs/nfsd/pnfs.h
> +++ b/fs/nfsd/pnfs.h
> @@ -1,6 +1,7 @@
>   #ifndef _FS_NFSD_PNFS_H
>   #define _FS_NFSD_PNFS_H 1
>
> +#ifdef CONFIG_NFSD_V4
>   #include <linux/exportfs.h>
>   #include <linux/nfsd/export.h>
>
> @@ -50,6 +51,7 @@ __be32 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
>   int nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
>   		u32 device_generation);
>   struct nfsd4_deviceid_map *nfsd4_find_devid_map(int idx);
> +#endif /* CONFIG_NFSD_V4 */
>
>   #ifdef CONFIG_NFSD_PNFS
>   void nfsd4_setup_layout_type(struct svc_export *exp);
> @@ -59,6 +61,9 @@ void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
>   int nfsd4_init_pnfs(void);
>   void nfsd4_exit_pnfs(void);
>   #else
> +struct nfs4_client;
> +struct nfs4_file;
> +
>   static inline void nfsd4_setup_layout_type(struct svc_export *exp)
>   {
>   }
>

Re: [PATCH] fs: nfsd:xdr4.h: add missing conditional group CONFIG_NFSD_V3

[Guenter Roeck]

On 02/13/2015 09:33 AM, J. Bruce Fields wrote:
[...]
>
>> Result is that every build with NFS configured but not NSFv3 is
>> now broken.
>
> Fortunately a v2-only server would be pretty unusual these days.
>
> I don't know, maybe this?
>
> --b.
>
> commit 535c381153631af3bc708a97e267a2a6a86ee030
> Author: J. Bruce Fields <bfields@redhat.com>
> Date:   Fri Feb 13 12:27:39 2015 -0500
>
>      nfsd4: fix v3-less build
>
>      Includes of pnfs.h in export.c and fcntl.c also bring in xdr4.h, which
>      won't build without CONFIG_NFSD_V3, breaking non-V3 builds.  Ifdef-out
>      most of pnfs.h in that case.
>
>      Reported-by: Bas Peters <baspeters93@gmail.com>
>      Reported-by: Jim Davis <jim.epost@gmail.com>
>      Fixes: 9cf514ccfac "nfsd: implement pNFS operations"
>     Signed-off-by: J. Bruce Fields <bfields@redhat.com>

Passes all my build and runtime tests.

Tested-by: Guenter Roeck <linux@roeck-us.net>

Guenter