linux-kernel - Re: [PATCH v2 2/5] fs, xfs: introduce FALLOC_FL_SEAL_BLOCK

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Message-ID: <20170804233140.GF21024@dastard>
Date:   Sat, 5 Aug 2017 09:31:40 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     darrick.wong@...cle.com, Jan Kara <jack@...e.cz>,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, Jeff Moyer <jmoyer@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>, luto@...nel.org,
        linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 2/5] fs, xfs: introduce FALLOC_FL_SEAL_BLOCK_MAP

On Thu, Aug 03, 2017 at 07:28:17PM -0700, Dan Williams wrote:
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index fe0f8f7f4bb7..46d8eb9e19fc 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -1393,6 +1393,107 @@ xfs_zero_file_space(
>  
>  }
>  
> +/* Return 1 if hole detected, 0 if not, and < 0 if fail to determine */
> +STATIC int
> +xfs_file_has_holes(
> +	struct xfs_inode	*ip)
> +{

Why do we need this function?

We've just run xfs_alloc_file_space() across the entire range we
are sealing, so we've already guaranteed that it won't have holes
in it.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com