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[5.186.122.168]) by smtp.gmail.com with ESMTPSA id m44sm10962346edm.54.2019.01.23.10.27.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 23 Jan 2019 10:27:16 -0800 (PST) From: =?utf-8?Q?Javier_Gonz=C3=A1lez?= Message-Id: Content-Type: multipart/signed; boundary="Apple-Mail=_6C7901A7-5D20-4C9C-B665-8EEA100B55D5"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 12.1 \(3445.101.1\)) Subject: Re: [PATCH 2/4] introduce four macros for in-kernel hints Date: Wed, 23 Jan 2019 19:27:12 +0100 In-Reply-To: <1547047861-7271-3-git-send-email-joshi.k@samsung.com> Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nvme@lists.infradead.org, jack@suse.com, david@fromorbit.com, tytso@mit.edu, prakash.v@samsung.com To: Kanchan Joshi References: <1547047861-7271-1-git-send-email-joshi.k@samsung.com> <1547047861-7271-3-git-send-email-joshi.k@samsung.com> X-Mailer: Apple Mail (2.3445.101.1) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org --Apple-Mail=_6C7901A7-5D20-4C9C-B665-8EEA100B55D5 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii > On 9 Jan 2019, at 16.30, Kanchan Joshi wrote: > > Exiting write-hints are exposed to user-mode. There is a possiblity > of conflict if kernel happens to use those. This patch introduces four > write-hints for exclusive kernel-mode use. > > Signed-off-by: Kanchan Joshi > --- > include/linux/fs.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/include/linux/fs.h b/include/linux/fs.h > index 811c777..e8548eb 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -291,6 +291,11 @@ enum rw_hint { > WRITE_LIFE_MEDIUM = RWH_WRITE_LIFE_MEDIUM, > WRITE_LIFE_LONG = RWH_WRITE_LIFE_LONG, > WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, > +/* below ones are meant for in-kernel use */ > + KERN_WRITE_LIFE_SHORT, > + KERN_WRITE_LIFE_MEDIUM, > + KERN_WRITE_LIFE_LONG, > + KERN_WRITE_LIFE_EXTREME > }; > I think Jens and Dave meant kernel hints to go top down. This would also give space for supporting more hints / streams from both ends for user and kernel. Javier --Apple-Mail=_6C7901A7-5D20-4C9C-B665-8EEA100B55D5 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEU1dMZpvMIkj0jATvPEYBfS0leOAFAlxIsgAACgkQPEYBfS0l eODI9g//dR040m0StXwBm+NOgmUh3cPN5zgCnWTJq1ZEQDwkRwrlqT7deA9se6Dw cuI1L1XlPzA7vKgqzmPou6WFcE/EwxzyLNXHILMXZAxZI53OHtTDuC0HD5p1KghI +NV/IpSunToiOmKXuzCwAz08i5TeoXvZXX4ytoYpTTKfwt7H+OgR439haKzb0xqI Hr8Ftu5Wbt6Bg54r3AfxPMqiKYL0XxTbeMocyQc+d/zR+UhSZUTPyCPaaXKY6T9x Ud5mflJWS+t5eiztVi+yDQEQb5V+8NaIrU8+lM1pCpmK2snDCy4pq2R6fOia16yq u3fknZzU4uV/QTWzwQQ24hdimsqNbm2aOAuD1f1lOEJDAziiH+S7J5d2NnLjZzAc 18Xvqemq2w7Z/3aq+PwNXHAK1i8pbmLQImEmWfQAZqKeEVwjYxKzDkUP3uCt4DVf 9/jAHRd+EAaioNyevpQ128DO6jtuGHZ2x7fekVqCzhN/Mwh1NSL/NLtCe1o5U1sM U9yCaJparFCsb2GV69XhqlZaSwuHPnpdU+x+zUHdUAJRFj4TLtSmQm5Sp5pSYLQP Fv2RoYAQTJ0jjc1WDXf+a0Pry7t65DHagRG/mmkebXKZDyH3bqV/YKvS40X9jGR1 nNwdSp8ShN71zFahUoNuijSAzMTrjODTMC2wPKVcrmeRXvI+/pY= =+41p -----END PGP SIGNATURE----- --Apple-Mail=_6C7901A7-5D20-4C9C-B665-8EEA100B55D5--