linux-ext4 - Re: [PATCHv5 1/6] ext4: Add IOMAP_F_MERGED for non-extent based mapping

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Message-ID: <20200228152614.GF8036@magnolia>
Date:   Fri, 28 Feb 2020 07:26:14 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org, jack@...e.cz, tytso@....edu,
        adilger.kernel@...ger.ca, linux-fsdevel@...r.kernel.org,
        hch@...radead.org, cmaiolino@...hat.com, david@...morbit.com
Subject: Re: [PATCHv5 1/6] ext4: Add IOMAP_F_MERGED for non-extent based
 mapping

On Fri, Feb 28, 2020 at 02:56:54PM +0530, Ritesh Harjani wrote:
> IOMAP_F_MERGED needs to be set in case of non-extent based mapping.
> This is needed in later patches for conversion of ext4_fiemap to use iomap.
> 
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> Reviewed-by: Jan Kara <jack@...e.cz>

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

--D

> ---
>  fs/ext4/inode.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index d035acab5b2a..6cf3b969dc86 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3335,6 +3335,10 @@ static void ext4_set_iomap(struct inode *inode, struct iomap *iomap,
>  	iomap->offset = (u64) map->m_lblk << blkbits;
>  	iomap->length = (u64) map->m_len << blkbits;
>  
> +	if ((map->m_flags & EXT4_MAP_MAPPED) &&
> +	    !ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
> +		iomap->flags |= IOMAP_F_MERGED;
> +
>  	/*
>  	 * Flags passed to ext4_map_blocks() for direct I/O writes can result
>  	 * in m_flags having both EXT4_MAP_MAPPED and EXT4_MAP_UNWRITTEN bits
> -- 
> 2.21.0
>