linux-kernel - Re: [PATCH] fuse: Add support for fuse stacked I/O

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Date:	Wed, 13 Jan 2016 20:57:16 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Nikhilesh Reddy <reddyn@...eaurora.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk,
	Richard Weinberger <richard.weinberger@...il.com>,
	Theodore Ts'o <tytso@....edu>, jack@...e.cz,
	Antonio SJ Musumeci <trapexit@...wn.link>, sven.utcke@....de,
	Nikolaus Rath <nikolaus@...h.org>
Subject: Re: [PATCH] fuse: Add support for fuse stacked I/O

On Wed, Jan 13, 2016 at 03:53:10PM -0800, Nikhilesh Reddy wrote:
> Add support for filesystem stacked read/write of files
> when enabled through a userspace init option of FUSE_STACKED_IO.
> 
> When FUSE_STACKED_IO is enabled all the reads and writes
> to the fuse mount point go directly to the native filesystem
> rather than through the fuse daemon. All requests that aren't
> read/write still go thought the userspace code.
> 
> Mmaped I/O is still not supported through stacking and can be
> added in.
> 
> This allows for significantly better performance on read and writes.
> The difference in performance  between fuse and the native lower
> filesystem is negligible.
> 
> There is also a significant cpu/power savings that is achieved which
> is really important on embedded systems that use fuse for I/O.
> 
> Signed-off-by: Nikhilesh Reddy <reddyn@...eaurora.org>
> ---
>  fs/fuse/Makefile          |   2 +-
>  fs/fuse/dev.c             |   4 ++
>  fs/fuse/dir.c             |   3 ++
>  fs/fuse/file.c            |  37 +++++++++++++--
>  fs/fuse/fuse_i.h          |  10 ++++
>  fs/fuse/fuse_stacked.h    |  31 +++++++++++++
>  fs/fuse/inode.c           |   5 ++
>  fs/fuse/stacked_io.c      | 113
> ++++++++++++++++++++++++++++++++++++++++++++++

Your patch is line-wrapped and impossible to apply.

And why cc: me?  This isn't my area of the kernel...

greg k-h