linux-kernel - Re: [PATCH v4] fuse: Add support for passthrough read/write

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Message-ID: <56A0D2F8.4020004@nod.at>
Date:	Thu, 21 Jan 2016 13:45:44 +0100
From:	Richard Weinberger <richard@....at>
To:	Bernd Schubert <bernd.schubert@...tmail.fm>,
	Nikhilesh Reddy <reddyn@...eaurora.org>,
	torvalds@...ux-foundation.org, Miklos Szeredi <miklos@...redi.hu>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	gregkh@...uxfoundation.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>,
	Jann Horn <jannhorn@...glemail.com>
Subject: Re: [PATCH v4] fuse: Add support for passthrough read/write

Am 21.01.2016 um 13:38 schrieb Bernd Schubert:
> On 01/21/2016 01:16 AM, Nikhilesh Reddy wrote:
>> Add support for filesystem passthrough read/write of files
>> when enabled in userspace through the option FUSE_PASSTHROUGH.
>>
>> There are many FUSE based filesystems that perform checks or
>> enforce policy or perform some kind of decision making in certain
>> functions like the "open" call but simply act as a "passthrough"
>> when performing operations such as read or write.
>>
>> When FUSE_PASSTHROUGH is enabled all the reads and writes
>> to the fuse mount point go directly to the passthrough filesystem
>> i.e a native filesystem that actually hosts the files rather than
>> through the fuse daemon. All requests that aren't read/write still
>> go thought the userspace code.
>>
>> 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>
> 
> I think it is common style to add a change log between patch set
> versions in the patch description.

And please slow down a bit. Collect a few review comments and then
do another version of your patch. :-)

Thanks,
//richard