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Date:   Fri, 28 Feb 2020 07:26:14 -0800
From:   "Darrick J. Wong" <darrick.wong@oracle.com>
To:     Ritesh Harjani <riteshh@linux.ibm.com>
Cc:     linux-ext4@vger.kernel.org, jack@suse.cz, tytso@mit.edu,
        adilger.kernel@dilger.ca, linux-fsdevel@vger.kernel.org,
        hch@infradead.org, cmaiolino@redhat.com, david@fromorbit.com
Subject: Re: [PATCHv5 1/6] ext4: Add IOMAP_F_MERGED for non-extent based
 mapping
Message-ID: <20200228152614.GF8036@magnolia>
References: <cover.1582880246.git.riteshh@linux.ibm.com>
 <a4764c91c08c16d4d4a4b36defb2a08625b0e9b3.1582880246.git.riteshh@linux.ibm.com>
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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@linux.ibm.com>
> Reviewed-by: Jan Kara <jack@suse.cz>

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