linux-ext4 - Re: [PATCH] ext4: optimize ext4 direct I/O locking for reading

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Message-ID: <20161003074103.GE6457@quack2.suse.cz>
Date:   Mon, 3 Oct 2016 09:41:03 +0200
From:   Jan Kara <jack@...e.cz>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] ext4: optimize ext4 direct I/O locking for reading

On Fri 30-09-16 01:22:33, Ted Tso wrote:
> I've been looking at your patch and testing it, and it looks like
> works fine as-is.

Glad to hear that!

> The other thing I like about this patch is it allows us to drop
> ext4_inode_{block,resume}_unlocked_dio() and EXT4_STATE_DIOREAD_LOCK.

Well, not completely - we still need to deal with unlocked writes that
happen in ext4_direct_IO_write() when overwrite == 1. But that should be
doable in a similar way. We could just demote inode_lock to a shared mode
instead of dropping it in ext4_direct_IO_write() and then we could drop the
bits you mention above. I can look into that when I'll be looking into
converting ext4 into the new iomap infrastructure but that's definitely
material for the next merge window.

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