linux-ext4 - Re: [PATCH v15 6/7] ext4: disable map

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Date:   Sun, 7 Jul 2019 12:34:15 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     dm-devel@...hat.com, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
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        qemu-devel@...gnu.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, dan.j.williams@...el.com,
        zwisler@...nel.org, vishal.l.verma@...el.com, dave.jiang@...el.com,
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Subject: Re: [PATCH v15 6/7] ext4: disable map_sync for async flush

On Fri, Jul 05, 2019 at 07:33:27PM +0530, Pankaj Gupta wrote:
> Dont support 'MAP_SYNC' with non-DAX files and DAX files
> with asynchronous dax_device. Virtio pmem provides
> asynchronous host page cache flush mechanism. We don't
> support 'MAP_SYNC' with virtio pmem and ext4.
> 
> Signed-off-by: Pankaj Gupta <pagupta@...hat.com>
> Reviewed-by: Jan Kara <jack@...e.cz>

Acked-by: Theodore Ts'o <tytso@....edu>