linux-ext4 - Re: [PATCH 11/13] dax, iomap: Add support for synchronous faults

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Message-ID: <20170824123451.GA6187@quack2.suse.cz>
Date:   Thu, 24 Aug 2017 14:34:51 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
        linux-nvdimm@...ts.01.org, Andy Lutomirski <luto@...nel.org>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Boaz Harrosh <boazh@...app.com>
Subject: Re: [PATCH 11/13] dax, iomap: Add support for synchronous faults

On Thu 24-08-17 05:27:20, Christoph Hellwig wrote:
> Just curious:  how does IOMAP_F_NEEDDSYNC practically differ
> from IOMAP_F_NEW?

In a subtle but important way ;). The main difference is that if the extent
has been already allocated by previous write, but the changing transaction
is not yet committed, we will return IOMAP_F_NEEDDSYNC but not IOMAP_F_NEW.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR