linux-ext4 - Re: [PATCH] ext4: Implement swap

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Message-ID: <20200907071308.GC27898@infradead.org>
Date:   Mon, 7 Sep 2020 08:13:08 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org, jack@...e.cz, tytso@....edu,
        linux-fsdevel@...r.kernel.org, darrick.wong@...cle.com,
        linux-kernel@...r.kernel.org, Yuxuan Shui <yshuiv7@...il.com>
Subject: Re: [PATCH] ext4: Implement swap_activate aops using iomap

On Fri, Sep 04, 2020 at 02:46:53PM +0530, Ritesh Harjani wrote:
> After moving ext4's bmap to iomap interface, swapon functionality
> on files created using fallocate (which creates unwritten extents) are
> failing. This is since iomap_bmap interface returns 0 for unwritten
> extents and thus generic_swapfile_activate considers this as holes
> and hence bail out with below kernel msg :-
> 
> [340.915835] swapon: swapfile has holes
> 
> To fix this we need to implement ->swap_activate aops in ext4
> which will use ext4_iomap_report_ops. Since we only need to return
> the list of extents so ext4_iomap_report_ops should be enough.

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>