linux-kernel - Re: [PATCH 12/23] xfs: remove uuid_getnodeuniq and xfs_uu

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Date:   Thu, 18 May 2017 16:35:17 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        David Howells <dhowells@...hat.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        linux-xfs@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-nvdimm@...1.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/23] xfs: remove uuid_getnodeuniq and xfs_uu_t

On Thu, May 18, 2017 at 08:26:54AM +0200, Christoph Hellwig wrote:
> Directly use the v1 intepretation of uuid_t instead.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  fs/xfs/uuid.c      | 25 -------------------------
>  fs/xfs/uuid.h      |  1 -
>  fs/xfs/xfs_mount.c |  6 +++++-
>  3 files changed, 5 insertions(+), 27 deletions(-)
> 
> diff --git a/fs/xfs/uuid.c b/fs/xfs/uuid.c
> index 29ed78c8637b..737c186ea98b 100644
> --- a/fs/xfs/uuid.c
> +++ b/fs/xfs/uuid.c
> @@ -17,31 +17,6 @@
>   */
>  #include <xfs.h>
>  
> -/* IRIX interpretation of an uuid_t */
> -typedef struct {
> -	__be32	uu_timelow;
> -	__be16	uu_timemid;
> -	__be16	uu_timehi;
> -	__be16	uu_clockseq;
> -	__be16	uu_node[3];
> -} xfs_uu_t;
> -
> -/*
> - * uuid_getnodeuniq - obtain the node unique fields of a UUID.
> - *
> - * This is not in any way a standard or condoned UUID function;
> - * it just something that's needed for user-level file handles.
> - */
> -void
> -uuid_getnodeuniq(uuid_t *uuid, int fsid [2])
> -{
> -	xfs_uu_t *uup = (xfs_uu_t *)uuid;
> -
> -	fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) |
> -		   be16_to_cpu(uup->uu_timemid);
> -	fsid[1] = be32_to_cpu(uup->uu_timelow);
> -}
> -
>  int
>  uuid_is_nil(uuid_t *uuid)
>  {
> diff --git a/fs/xfs/uuid.h b/fs/xfs/uuid.h
> index 86bbed071e79..5aea49bf0963 100644
> --- a/fs/xfs/uuid.h
> +++ b/fs/xfs/uuid.h
> @@ -19,6 +19,5 @@
>  #define __XFS_SUPPORT_UUID_H__
>  
>  extern int uuid_is_nil(uuid_t *uuid);
> -extern void uuid_getnodeuniq(uuid_t *uuid, int fsid [2]);
>  
>  #endif	/* __XFS_SUPPORT_UUID_H__ */
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index 2eaf81859166..742e4a61c0bc 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -793,7 +793,11 @@ xfs_mountfs(
>  	 *  Copies the low order bits of the timestamp and the randomly
>  	 *  set "sequence" number out of a UUID.
>  	 */
> -	uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
> +	mp->m_fixedfsid[0] =
> +		((u32)sbp->sb_uuid.v1.clock_seq_hi_and_reserved << 24) |
> +		((u32)sbp->sb_uuid.v1.clock_seq_low << 16) |
> +		 be16_to_cpu(sbp->sb_uuid.v1.time_mid);
> +	mp->m_fixedfsid[1] = be32_to_cpu(sbp->sb_uuid.v1.time_low);
>  
>  	mp->m_dmevmask = 0;	/* not persistent; set after each mount */
>  
> -- 
> 2.11.0
> 
> --
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