linux-kernel - Re: [PATCH] uapi: fix linux/nfsd/cld.h userspace compilation errors

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Date:   Fri, 10 Mar 2017 01:31:14 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     "J. Bruce Fields" <bfields@...ldses.org>
Cc:     Jeff Layton <jlayton@...chiereds.net>, linux-nfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uapi: fix linux/nfsd/cld.h userspace compilation errors

On Thu, Mar 09, 2017 at 04:00:51PM -0500, J. Bruce Fields wrote:
> Why aren't the unitX_t types OK here?

unitX_t types are not OK here because no UAPI header defines them,
include/uapi/linux/types.h defines only their __uX/__sX analogues.

For this reason most of UAPI headers use types provided by
<linux/types.h>, see e.g. include/uapi/linux/nfsd/nfsfh.h

There are few exceptions to this rule when headers are made portable
between linux and other operating systems.

> Anyway, assuming this is right I'll apply for 4.12.  (I'm assuming it's
> not urgent since this file's always been this way.)

This should be safe to apply for 4.11 as well, but it's surely not urgent.

> --b.
> 
> On Wed, Mar 01, 2017 at 03:12:03AM +0300, Dmitry V. Levin wrote:
> > Include <linux/types.h> and consistently use types it provides
> > to fix the following linux/nfsd/cld.h userspace compilation errors:
> > 
> > /usr/include/linux/nfsd/cld.h:40:2: error: unknown type name 'uint16_t'
> >   uint16_t cn_len;    /* length of cm_id */
> > /usr/include/linux/nfsd/cld.h:46:2: error: unknown type name 'uint8_t'
> >   uint8_t  cm_vers;  /* upcall version */
> > /usr/include/linux/nfsd/cld.h:47:2: error: unknown type name 'uint8_t'
> >   uint8_t  cm_cmd;   /* upcall command */
> > /usr/include/linux/nfsd/cld.h:48:2: error: unknown type name 'int16_t'
> >   int16_t  cm_status;  /* return code */
> > /usr/include/linux/nfsd/cld.h:49:2: error: unknown type name 'uint32_t'
> >   uint32_t cm_xid;   /* transaction id */
> > /usr/include/linux/nfsd/cld.h:51:3: error: unknown type name 'int64_t'
> >    int64_t  cm_gracetime; /* grace period start time */
> > 
> > Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> > ---
> >  include/uapi/linux/nfsd/cld.h | 14 ++++++++------
> >  1 file changed, 8 insertions(+), 6 deletions(-)
> > 
> > diff --git a/include/uapi/linux/nfsd/cld.h b/include/uapi/linux/nfsd/cld.h
> > index f14a9ab..ec26027 100644
> > --- a/include/uapi/linux/nfsd/cld.h
> > +++ b/include/uapi/linux/nfsd/cld.h
> > @@ -22,6 +22,8 @@
> >  #ifndef _NFSD_CLD_H
> >  #define _NFSD_CLD_H
> >  
> > +#include <linux/types.h>
> > +
> >  /* latest upcall version available */
> >  #define CLD_UPCALL_VERSION 1
> >  
> > @@ -37,18 +39,18 @@ enum cld_command {
> >  
> >  /* representation of long-form NFSv4 client ID */
> >  struct cld_name {
> > -	uint16_t	cn_len;				/* length of cm_id */
> > +	__u16		cn_len;				/* length of cm_id */
> >  	unsigned char	cn_id[NFS4_OPAQUE_LIMIT];	/* client-provided */
> >  } __attribute__((packed));
> >  
> >  /* message struct for communication with userspace */
> >  struct cld_msg {
> > -	uint8_t		cm_vers;		/* upcall version */
> > -	uint8_t		cm_cmd;			/* upcall command */
> > -	int16_t		cm_status;		/* return code */
> > -	uint32_t	cm_xid;			/* transaction id */
> > +	__u8		cm_vers;		/* upcall version */
> > +	__u8		cm_cmd;			/* upcall command */
> > +	__s16		cm_status;		/* return code */
> > +	__u32		cm_xid;			/* transaction id */
> >  	union {
> > -		int64_t		cm_gracetime;	/* grace period start time */
> > +		__s64		cm_gracetime;	/* grace period start time */
> >  		struct cld_name	cm_name;
> >  	} __attribute__((packed)) cm_u;
> >  } __attribute__((packed));
> > -- 
> > ldv

-- 
ldv

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