From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@infradead.org>, xfs@oss.sgi.com
Subject: Re: [PATCH 4/5] xfs: push the ilock into xfs_zero_eof
Date: Tue, 27 Mar 2012 01:48:27 -0400 [thread overview]
Message-ID: <20120327054827.GA11976@infradead.org> (raw)
In-Reply-To: <20120327011540.GS5091@dastard>
On Tue, Mar 27, 2012 at 12:15:40PM +1100, Dave Chinner wrote:
> > + xfs_ilock(ip, XFS_ILOCK_EXCL);
> > error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
> > + xfs_iunlock(ip, XFS_ILOCK_EXCL);
>
> Does that even need to be an exclusive lock? a shared lock is all
> that is needed to do a lookup, and this is just a lookup...
It has to be a xfs_ilock_map_shared - but given that we hold the iolock
exclusive anyway I didn't bother to optimize this further.
Same for the second xfs_bmapi_read call.
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next prev parent reply other threads:[~2012-03-27 5:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-26 21:14 [PATCH 0/5] reduce exclusive ilock hold times Christoph Hellwig
2012-03-26 21:14 ` [PATCH 1/5] xfs: avoid taking the ilock unnessecarily in xfs_qm_dqattach Christoph Hellwig
2012-03-26 22:13 ` Dave Chinner
2012-03-26 21:14 ` [PATCH 2/5] xfs: reduce ilock hold times in xfs_file_aio_write_checks Christoph Hellwig
2012-03-26 22:15 ` Dave Chinner
2012-03-26 21:14 ` [PATCH 3/5] xfs: reduce ilock hold times in xfs_setattr_size Christoph Hellwig
2012-03-26 22:17 ` Dave Chinner
2012-03-26 21:14 ` [PATCH 4/5] xfs: push the ilock into xfs_zero_eof Christoph Hellwig
2012-03-27 1:15 ` Dave Chinner
2012-03-27 5:48 ` Christoph Hellwig [this message]
2012-03-27 6:11 ` Dave Chinner
2012-03-26 21:14 ` [PATCH 5/5] xfs: use shared ilock mode for direct IO writes by default Christoph Hellwig
2012-03-27 1:39 ` Dave Chinner
2012-03-27 6:08 ` [PATCH 0/5] reduce exclusive ilock hold times Dave Chinner
-- strict thread matches above, loose matches on Subject: below --
2012-03-27 14:34 [PATCH 0/5] reduce exclusive ilock hold times V2 Christoph Hellwig
2012-03-27 14:34 ` [PATCH 4/5] xfs: push the ilock into xfs_zero_eof Christoph Hellwig
2012-04-02 20:39 ` Mark Tinguely
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