Re: [PATCH 14/23] xfs: use the common helper uuid_is_null()

[Brian Foster <bfoster@redhat.com>]

On Thu, May 18, 2017 at 08:26:56AM +0200, Christoph Hellwig wrote:
> From: Amir Goldstein <amir73il@gmail.com>
> 
> Use the common helper uuid_is_null() and remove the xfs specific
> helper uuid_is_nil().
> 
> The common helper does not check for the NULL pointer value as
> xfs helper did, but xfs code never calls the helper with a pointer
> that can be NULL.
> 
> Conform comments and warning strings to use the term 'null uuid'
> instead of 'nil uuid', because this is the terminology used by
> lib/uuid.c and its users. It is also the terminology used in
> userspace by libuuid and xfsprogs.
> 
> Signed-off-by: Amir Goldstein <amir73il@gmail.com>
> [hch: remove now unused uuid.[ch]]
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/Makefile          |  3 +--
>  fs/xfs/uuid.c            | 32 --------------------------------
>  fs/xfs/uuid.h            | 23 -----------------------
>  fs/xfs/xfs_linux.h       |  1 -
>  fs/xfs/xfs_log_recover.c |  6 +++---
>  fs/xfs/xfs_mount.c       |  8 ++++----
>  6 files changed, 8 insertions(+), 65 deletions(-)
>  delete mode 100644 fs/xfs/uuid.c
>  delete mode 100644 fs/xfs/uuid.h
> 
> diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
> index 5c90f82b8f6b..a6e955bfead8 100644
> --- a/fs/xfs/Makefile
> +++ b/fs/xfs/Makefile
> @@ -98,8 +98,7 @@ xfs-y				+= xfs_aops.o \
>  				   xfs_sysfs.o \
>  				   xfs_trans.o \
>  				   xfs_xattr.o \
> -				   kmem.o \
> -				   uuid.o
> +				   kmem.o
>  
>  # low-level transaction/log code
>  xfs-y				+= xfs_log.o \
> diff --git a/fs/xfs/uuid.c b/fs/xfs/uuid.c
> deleted file mode 100644
> index 737c186ea98b..000000000000
> --- a/fs/xfs/uuid.c
> +++ /dev/null
> @@ -1,32 +0,0 @@
> -/*
> - * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
> - * All Rights Reserved.
> - *
> - * This program is free software; you can redistribute it and/or
> - * modify it under the terms of the GNU General Public License as
> - * published by the Free Software Foundation.
> - *
> - * This program is distributed in the hope that it would be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> - * GNU General Public License for more details.
> - *
> - * You should have received a copy of the GNU General Public License
> - * along with this program; if not, write the Free Software Foundation,
> - * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> - */
> -#include <xfs.h>
> -
> -int
> -uuid_is_nil(uuid_t *uuid)
> -{
> -	int	i;
> -	char	*cp = (char *)uuid;
> -
> -	if (uuid == NULL)
> -		return 0;
> -	/* implied check of version number here... */
> -	for (i = 0; i < sizeof *uuid; i++)
> -		if (*cp++) return 0;	/* not nil */
> -	return 1;	/* is nil */
> -}
> diff --git a/fs/xfs/uuid.h b/fs/xfs/uuid.h
> deleted file mode 100644
> index 5aea49bf0963..000000000000
> --- a/fs/xfs/uuid.h
> +++ /dev/null
> @@ -1,23 +0,0 @@
> -/*
> - * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
> - * All Rights Reserved.
> - *
> - * This program is free software; you can redistribute it and/or
> - * modify it under the terms of the GNU General Public License as
> - * published by the Free Software Foundation.
> - *
> - * This program is distributed in the hope that it would be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> - * GNU General Public License for more details.
> - *
> - * You should have received a copy of the GNU General Public License
> - * along with this program; if not, write the Free Software Foundation,
> - * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> - */
> -#ifndef __XFS_SUPPORT_UUID_H__
> -#define __XFS_SUPPORT_UUID_H__
> -
> -extern int uuid_is_nil(uuid_t *uuid);
> -
> -#endif	/* __XFS_SUPPORT_UUID_H__ */
> diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
> index 2c33d915e550..2d167fe643ec 100644
> --- a/fs/xfs/xfs_linux.h
> +++ b/fs/xfs/xfs_linux.h
> @@ -43,7 +43,6 @@ typedef __u32			xfs_nlink_t;
>  
>  #include "kmem.h"
>  #include "mrlock.h"
> -#include "uuid.h"
>  
>  #include <linux/semaphore.h>
>  #include <linux/mm.h>
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index cd0b077deb35..8cec1e5505a4 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -352,13 +352,13 @@ xlog_header_check_mount(
>  {
>  	ASSERT(head->h_magicno == cpu_to_be32(XLOG_HEADER_MAGIC_NUM));
>  
> -	if (uuid_is_nil(&head->h_fs_uuid)) {
> +	if (uuid_is_null(&head->h_fs_uuid)) {
>  		/*
>  		 * IRIX doesn't write the h_fs_uuid or h_fmt fields. If
> -		 * h_fs_uuid is nil, we assume this log was last mounted
> +		 * h_fs_uuid is null, we assume this log was last mounted
>  		 * by IRIX and continue.
>  		 */
> -		xfs_warn(mp, "nil uuid in log - IRIX style log");
> +		xfs_warn(mp, "null uuid in log - IRIX style log");
>  	} else if (unlikely(!uuid_equal(&mp->m_sb.sb_uuid, &head->h_fs_uuid))) {
>  		xfs_warn(mp, "log has mismatched uuid - can't recover");
>  		xlog_header_check_dump(mp, head);
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index 742e4a61c0bc..682b336a7a6a 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -80,14 +80,14 @@ xfs_uuid_mount(
>  	if (mp->m_flags & XFS_MOUNT_NOUUID)
>  		return 0;
>  
> -	if (uuid_is_nil(uuid)) {
> -		xfs_warn(mp, "Filesystem has nil UUID - can't mount");
> +	if (uuid_is_null(uuid)) {
> +		xfs_warn(mp, "Filesystem has null UUID - can't mount");
>  		return -EINVAL;
>  	}
>  
>  	mutex_lock(&xfs_uuid_table_mutex);
>  	for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
> -		if (uuid_is_nil(&xfs_uuid_table[i])) {
> +		if (uuid_is_null(&xfs_uuid_table[i])) {
>  			hole = i;
>  			continue;
>  		}
> @@ -124,7 +124,7 @@ xfs_uuid_unmount(
>  
>  	mutex_lock(&xfs_uuid_table_mutex);
>  	for (i = 0; i < xfs_uuid_table_size; i++) {
> -		if (uuid_is_nil(&xfs_uuid_table[i]))
> +		if (uuid_is_null(&xfs_uuid_table[i]))
>  			continue;
>  		if (!uuid_equal(uuid, &xfs_uuid_table[i]))
>  			continue;
> -- 
> 2.11.0
> 
> --
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