VFS/XFS: directio updates to ease COW handling

xfs

VFS/XFS: directio updates to ease COW handling

To:	linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, ocfs2-devel@xxxxxxxxxxxxxx
Subject:	VFS/XFS: directio updates to ease COW handling
From:	Christoph Hellwig <hch@xxxxxx>
Date:	Tue, 2 Feb 2016 21:17:34 +0100
Cc:	darrick.wong@xxxxxxxxxx
Delivered-to:	xfs@xxxxxxxxxxx

The first patch ensures ->end_io is always called for direct I/O requests
that pass it in, even if there was a zero length write, or if an error
occured.  The existing users have been updated to ignore it, but XFS
will make use of it in the future, and a comment in ext4 suggests it
might be useful for it as well.

The other two simplify the XFS direct I/O code.

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VFS/XFS: directio updates to ease COW handling, Christoph Hellwig <= [PATCH 2/3] xfs: don't use ioends for direct write completions, Christoph Hellwig Re: [PATCH 2/3] xfs: don't use ioends for direct write completions, Brian Foster [PATCH 1/3] direct-io: always call ->end_io if non-NULL, Christoph Hellwig Re: [PATCH 1/3] direct-io: always call ->end_io if non-NULL, Darrick J. Wong Re: [PATCH 1/3] direct-io: always call ->end_io if non-NULL, Christoph Hellwig [PATCH 3/3] xfs: fold xfs_vm_do_dio into xfs_vm_direct_IO, Christoph Hellwig Re: [PATCH 3/3] xfs: fold xfs_vm_do_dio into xfs_vm_direct_IO, Brian Foster

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