Re: [PATCH -next] nfs: fsinfo: fix build when CONFIG_NFS_V4 is not enabled

[Trond Myklebust <trondmy@hammerspace.com>]

On Fri, 2020-05-15 at 10:27 -0700, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@infradead.org>
> 
> Fix multiple build errors when CONFIG_NFS_V4 is not enabled.
> 
> ../fs/nfs/fsinfo.c: In function 'nfs_fsinfo_get_supports':
> ../fs/nfs/fsinfo.c:153:12: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if (server->attr_bitmask[0] & FATTR4_WORD0_SIZE)
>             ^~
> ../fs/nfs/fsinfo.c:155:12: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if (server->attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
>             ^~
> ../fs/nfs/fsinfo.c:158:12: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if (server->attr_bitmask[0] & FATTR4_WORD0_ARCHIVE)
>             ^~
> ../fs/nfs/fsinfo.c:160:12: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if (server->attr_bitmask[0] & FATTR4_WORD0_HIDDEN)
>             ^~
> ../fs/nfs/fsinfo.c:162:12: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if (server->attr_bitmask[1] & FATTR4_WORD1_SYSTEM)
>             ^~
> ../fs/nfs/fsinfo.c: In function 'nfs_fsinfo_get_features':
> ../fs/nfs/fsinfo.c:205:12: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if (server->attr_bitmask[0] & FATTR4_WORD0_CASE_INSENSITIVE)
>             ^~
> ../fs/nfs/fsinfo.c:207:13: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>   if ((server->attr_bitmask[0] & FATTR4_WORD0_ARCHIVE) ||
>              ^~
> ../fs/nfs/fsinfo.c:208:13: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>       (server->attr_bitmask[0] & FATTR4_WORD0_HIDDEN) ||
>              ^~
> ../fs/nfs/fsinfo.c:209:13: error: 'const struct nfs_server' has no
> member named 'attr_bitmask'
>       (server->attr_bitmask[1] & FATTR4_WORD1_SYSTEM))
>              ^~
> 
> 
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Cc: linux-nfs@vger.kernel.org
> Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
> Cc: Anna Schumaker <anna.schumaker@netapp.com>
> Cc: Alexander Viro <viro@zeniv.linux.org.uk>
> Cc: linux-fsdevel@vger.kernel.org
> Cc: David Howells <dhowells@redhat.com>
> ---
>  fs/nfs/fsinfo.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> --- linux-next-20200515.orig/fs/nfs/fsinfo.c
> +++ linux-next-20200515/fs/nfs/fsinfo.c
> @@ -5,6 +5,7 @@
>   * Written by David Howells (dhowells@redhat.com)
>   */
>  
> +#include <linux/kconfig.h>
>  #include <linux/nfs_fs.h>
>  #include <linux/windows.h>
>  #include "internal.h"
> @@ -150,6 +151,7 @@ static int nfs_fsinfo_get_supports(struc
>  		sup->stx_mask |= STATX_CTIME;
>  	if (server->caps & NFS_CAP_MTIME)
>  		sup->stx_mask |= STATX_MTIME;
> +#if IS_ENABLED(CONFIG_NFS_V4)
>  	if (server->attr_bitmask[0] & FATTR4_WORD0_SIZE)
>  		sup->stx_mask |= STATX_SIZE;
>  	if (server->attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
> @@ -161,6 +163,7 @@ static int nfs_fsinfo_get_supports(struc
>  		sup->win_file_attrs |= ATTR_HIDDEN;
>  	if (server->attr_bitmask[1] & FATTR4_WORD1_SYSTEM)
>  		sup->win_file_attrs |= ATTR_SYSTEM;
> +#endif
>  
>  	sup->stx_attributes = STATX_ATTR_AUTOMOUNT;
>  	return sizeof(*sup);
> @@ -202,12 +205,14 @@ static int nfs_fsinfo_get_features(struc
>  	if (server->caps & NFS_CAP_MTIME)
>  		fsinfo_set_feature(ft, FSINFO_FEAT_HAS_MTIME);
>  
> +#if IS_ENABLED(CONFIG_NFS_V4)
>  	if (server->attr_bitmask[0] & FATTR4_WORD0_CASE_INSENSITIVE)
>  		fsinfo_set_feature(ft, FSINFO_FEAT_NAME_CASE_INDEP);
>  	if ((server->attr_bitmask[0] & FATTR4_WORD0_ARCHIVE) ||
>  	    (server->attr_bitmask[0] & FATTR4_WORD0_HIDDEN) ||
>  	    (server->attr_bitmask[1] & FATTR4_WORD1_SYSTEM))
>  		fsinfo_set_feature(ft, FSINFO_FEAT_WINDOWS_ATTRS);
> +#endif
>  
>  	return sizeof(*ft);
>  }

This whole thing needs to be reviewed and acked by the NFS community,
and quite frankly I'm inclined to NAK this. This is the second time
David tries to push this unwanted rewrite of totally unrelated code.

> 
-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@hammerspace.com