From: Jens Axboe <jaxboe@fusionio.com>
To: Mike Snitzer <snitzer@redhat.com>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Neil Brown <neilb@suse.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"drbd-dev@lists.linbit.com" <drbd-dev@lists.linbit.com>
Subject: Re: [Drbd-dev] [PATCH] block: read i_size with i_size_read()
Date: Sun, 7 Nov 2010 12:45:39 +0100 [thread overview]
Message-ID: <4CD69163.1030407@fusionio.com> (raw)
In-Reply-To: <1288985241-3515-1-git-send-email-snitzer@redhat.com>
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
WARNING: multiple messages have this Message-ID (diff)
From: Jens Axboe <jaxboe@fusionio.com>
To: Mike Snitzer <snitzer@redhat.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Neil Brown <neilb@suse.de>,
"drbd-dev@lists.linbit.com" <drbd-dev@lists.linbit.com>
Subject: Re: [PATCH] block: read i_size with i_size_read()
Date: Sun, 7 Nov 2010 12:45:39 +0100 [thread overview]
Message-ID: <4CD69163.1030407@fusionio.com> (raw)
In-Reply-To: <1288985241-3515-1-git-send-email-snitzer@redhat.com>
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
next prev parent reply other threads:[~2010-11-07 12:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-05 19:27 [Drbd-dev] [PATCH] block: read i_size with i_size_read() Mike Snitzer
2010-11-05 19:27 ` Mike Snitzer
2010-11-05 19:37 ` [Drbd-dev] " Neil Brown
2010-11-05 19:37 ` Neil Brown
2010-11-05 19:37 ` Neil Brown
2010-11-05 21:04 ` [Drbd-dev] " Lars Ellenberg
2010-11-05 21:04 ` Lars Ellenberg
2010-11-05 21:04 ` [Drbd-dev] " Lars Ellenberg
2010-11-07 11:45 ` Jens Axboe [this message]
2010-11-07 11:45 ` Jens Axboe
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