From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 4/7] xfs: split direct IO write path from xfs_file_aio_write
Date: Thu, 16 Dec 2010 07:06:29 -0500 [thread overview]
Message-ID: <20101216120629.GC20445@infradead.org> (raw)
In-Reply-To: <1292376208-16282-5-git-send-email-david@fromorbit.com>
> +STATIC ssize_t
> +xfs_file_dio_aio_write(
> + struct kiocb *iocb,
> + const struct iovec *iovp,
> + unsigned long nr_segs,
> + loff_t pos,
> + size_t ocount,
> + int *need_i_mutex,
> + int *iolock)
need_i_mutex == 1 is equivalent to iolock == XFS_IOLOCK_EXCL, I think
it's a good idea to throw in a patch to remove the need_i_mutex variable
before this patch.
Maybe that patch can even add xfs_rw_lock or similar helpers to
manipulate the i_mutex, the iolock, and the iolock variable together?
Speaking of that, shouldn't xfs_file_aio_read also take the iolock
exclusive during the page invalidation and then demote it, just like
the write case? The above helpers would enforce that nicely.
> + if ((pos & target->bt_smask) || (count & target->bt_smask))
> + return XFS_ERROR(-EINVAL);
For the error traps to work this needs to be
-XFS_ERROR(EINVAL);
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next prev parent reply other threads:[~2010-12-16 12:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-15 1:23 [PATCH 0/7] xfs: serialise unaligned direct IOs Dave Chinner
2010-12-15 1:23 ` [PATCH 1/7] xfs: ensure sync write errors are returned Dave Chinner
2010-12-16 11:57 ` Christoph Hellwig
2010-12-16 21:57 ` Dave Chinner
2010-12-16 20:50 ` Alex Elder
2010-12-17 6:43 ` Dave Chinner
2010-12-15 1:23 ` [PATCH 2/7] xfs: factor common post-write isize handling code Dave Chinner
2010-12-15 1:23 ` [PATCH 4/7] xfs: split direct IO write path from xfs_file_aio_write Dave Chinner
2010-12-16 12:06 ` Christoph Hellwig [this message]
2010-12-17 7:31 ` Dave Chinner
2010-12-20 11:29 ` Christoph Hellwig
2010-12-21 0:51 ` Dave Chinner
2010-12-15 1:23 ` [PATCH 5/7] xfs: split buffered " Dave Chinner
2010-12-15 1:23 ` [PATCH 6/7] xfs: factor common write setup code Dave Chinner
2010-12-15 1:23 ` [PATCH 7/7] xfs: serialise unaligned direct IOs Dave Chinner
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