linux-kernel - Re: [PATCH] block: read i_size with i_size

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Message-ID: <4CD69163.1030407@fusionio.com>
Date:	Sun, 7 Nov 2010 12:45:39 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Neil Brown <neilb@...e.de>,
	"drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>
Subject: Re: [PATCH] block: read i_size with i_size_read()

On 2010-11-05 20:27, Mike Snitzer wrote:
> Convert direct reads of an inode's i_size to using i_size_read().
> 
> i_size_{read,write} use a seqcount to protect reads from accessing
> incomple writes.  Concurrent i_size_write()s require mutual exclussion
> to protect the seqcount that is used by i_size_{read,write}.  But
> i_size_read() callers do not need to use additional locking.

Thanks Mike, I'll queue this up.

-- 
Jens Axboe

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