Re: [PATCH 07/15] xfs: move the di_flushiter field to struct xfs_inode

From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 07/15] xfs: move the di_flushiter field to struct xfs_inode
Date: Tue, 30 Jun 2020 10:48:59 -0700	[thread overview]
Message-ID: <20200630174859.GD7606@magnolia> (raw)
In-Reply-To: <20200620071102.462554-8-hch@lst.de>

On Sat, Jun 20, 2020 at 09:10:54AM +0200, Christoph Hellwig wrote:
> In preparation of removing the historic icinode struct, move the
> flushiter field into the containing xfs_inode structure.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

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

--D

> ---
>  fs/xfs/libxfs/xfs_inode_buf.c |  4 ++--
>  fs/xfs/libxfs/xfs_inode_buf.h |  1 -
>  fs/xfs/xfs_icache.c           |  2 +-
>  fs/xfs/xfs_inode.c            | 19 +++++++++----------
>  fs/xfs/xfs_inode.h            |  1 +
>  fs/xfs/xfs_inode_item.c       |  2 +-
>  6 files changed, 14 insertions(+), 15 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
> index 860e35611e001a..03bd7cdd0ddc81 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.c
> +++ b/fs/xfs/libxfs/xfs_inode_buf.c
> @@ -205,7 +205,7 @@ xfs_inode_from_disk(
>  	 * inode. If the inode is unused, mode is zero and we shouldn't mess
>  	 * with the unitialized part of it.
>  	 */
> -	to->di_flushiter = be16_to_cpu(from->di_flushiter);
> +	ip->i_flushiter = be16_to_cpu(from->di_flushiter);
>  	inode->i_generation = be32_to_cpu(from->di_gen);
>  	inode->i_mode = be16_to_cpu(from->di_mode);
>  	if (!inode->i_mode)
> @@ -329,7 +329,7 @@ xfs_inode_to_disk(
>  		to->di_flushiter = 0;
>  	} else {
>  		to->di_version = 2;
> -		to->di_flushiter = cpu_to_be16(from->di_flushiter);
> +		to->di_flushiter = cpu_to_be16(ip->i_flushiter);
>  	}
>  }
>  
> diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
> index 663a97fa78f05f..8cc96f2766ff4f 100644
> --- a/fs/xfs/libxfs/xfs_inode_buf.h
> +++ b/fs/xfs/libxfs/xfs_inode_buf.h
> @@ -16,7 +16,6 @@ struct xfs_dinode;
>   * format specific structures at the appropriate time.
>   */
>  struct xfs_icdinode {
> -	uint16_t	di_flushiter;	/* incremented on flush */
>  	uint8_t		di_forkoff;	/* attr fork offs, <<3 for 64b align */
>  	uint32_t	di_dmevmask;	/* DMIG event mask */
>  	uint16_t	di_dmstate;	/* DMIG state info */
> diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> index ad01e694f3ab9b..e6b40f7035aa5a 100644
> --- a/fs/xfs/xfs_icache.c
> +++ b/fs/xfs/xfs_icache.c
> @@ -521,7 +521,7 @@ xfs_iget_cache_miss(
>  	 * simply build the new inode core with a random generation number.
>  	 *
>  	 * For version 4 (and older) superblocks, log recovery is dependent on
> -	 * the di_flushiter field being initialised from the current on-disk
> +	 * the i_flushiter field being initialised from the current on-disk
>  	 * value and hence we must also read the inode off disk even when
>  	 * initializing new inodes.
>  	 */
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index f1893824cd4e2f..5e0336e0dbae44 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -3765,16 +3765,15 @@ xfs_iflush_int(
>  	}
>  
>  	/*
> -	 * Inode item log recovery for v2 inodes are dependent on the
> -	 * di_flushiter count for correct sequencing. We bump the flush
> -	 * iteration count so we can detect flushes which postdate a log record
> -	 * during recovery. This is redundant as we now log every change and
> -	 * hence this can't happen but we need to still do it to ensure
> -	 * backwards compatibility with old kernels that predate logging all
> -	 * inode changes.
> +	 * Inode item log recovery for v2 inodes are dependent on the flushiter
> +	 * count for correct sequencing.  We bump the flush iteration count so
> +	 * we can detect flushes which postdate a log record during recovery.
> +	 * This is redundant as we now log every change and hence this can't
> +	 * happen but we need to still do it to ensure backwards compatibility
> +	 * with old kernels that predate logging all inode changes.
>  	 */
>  	if (!xfs_sb_version_has_v3inode(&mp->m_sb))
> -		ip->i_d.di_flushiter++;
> +		ip->i_flushiter++;
>  
>  	/*
>  	 * If there are inline format data / attr forks attached to this inode,
> @@ -3795,8 +3794,8 @@ xfs_iflush_int(
>  	xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
>  
>  	/* Wrap, we never let the log put out DI_MAX_FLUSH */
> -	if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
> -		ip->i_d.di_flushiter = 0;
> +	if (ip->i_flushiter == DI_MAX_FLUSH)
> +		ip->i_flushiter = 0;
>  
>  	xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
>  	if (XFS_IFORK_Q(ip))
> diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
> index 2cdb7b6b298852..581618ea1156da 100644
> --- a/fs/xfs/xfs_inode.h
> +++ b/fs/xfs/xfs_inode.h
> @@ -59,6 +59,7 @@ typedef struct xfs_inode {
>  	uint32_t		i_projid;	/* owner's project id */
>  	xfs_extlen_t		i_extsize;	/* basic/minimum extent size */
>  	xfs_extlen_t		i_cowextsize;	/* basic cow extent size */
> +	uint16_t		i_flushiter;	/* incremented on flush */
>  
>  	struct xfs_icdinode	i_d;		/* most of ondisk inode */
>  
> diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
> index ab0d8cf8ceb6ab..8357fe37d3eb8a 100644
> --- a/fs/xfs/xfs_inode_item.c
> +++ b/fs/xfs/xfs_inode_item.c
> @@ -351,7 +351,7 @@ xfs_inode_to_log_dinode(
>  		to->di_flushiter = 0;
>  	} else {
>  		to->di_version = 2;
> -		to->di_flushiter = from->di_flushiter;
> +		to->di_flushiter = ip->i_flushiter;
>  	}
>  }
>  
> -- 
> 2.26.2
> 