linux-ext4 - Re: [PATCH] ext4: delayed inode update for the consistency of file size after a crash

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Date:   Mon, 18 Dec 2017 04:32:02 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Theodore Ts'o <tytso@....edu>,
        Seongbae Son <seongbae.son@...il.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: delayed inode update for the consistency of file
 size after a crash

> that update of the timestamp and i_size needs to be moved to an I/O
> completion handler.  We do this already to convert unwritten requests
> to be written in fs/ext4/page_io.c.  See ext4_put_io_end_defer() in
> fs/ext4/page_io.c; if we need to convert unwritten extents the
> EXT4_IO_END_UNWRITTEN flag is set, and ext4_add_complete_io() tacks
> the io_end queue onto a workqueue.  This infrastructure could be made
> more general so that it can do other work after the I/O has been
> completed, including the i_size update.

That's what we do for the i_size update in XFS.