From: Simon Ruderich Subject: Re: Unexpected writes seen on a Read-only, DAX enabled EXT4 fs Date: Tue, 12 Sep 2017 11:03:49 +0200 Message-ID: <20170912090349.6ow4bv56px2uoqw3@ruderich.org> References: <2036030243.251059.1504977026265.ref@mail.yahoo.com> <2036030243.251059.1504977026265@mail.yahoo.com> <20170911182112.GA20005@linux.intel.com> <9F35007B-F0D9-4FB9-A52D-604E410AB389@dilger.ca> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="=_zucker.schokokeks.org-32653-1505207029-0001-2" Cc: Ross Zwisler , Soccer Liu , linux-ext4@vger.kernel.org, "linux-nvdimm@lists.01.org" To: Andreas Dilger Return-path: Received: from zucker2.schokokeks.org ([178.63.68.90]:35483 "EHLO zucker2.schokokeks.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751430AbdILJIz (ORCPT ); Tue, 12 Sep 2017 05:08:55 -0400 Content-Disposition: inline In-Reply-To: <9F35007B-F0D9-4FB9-A52D-604E410AB389@dilger.ca> Sender: linux-ext4-owner@vger.kernel.org List-ID: This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_zucker.schokokeks.org-32653-1505207029-0001-2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Sep 11, 2017 at 02:31:41PM -0600, Andreas Dilger wrote: > On Sep 11, 2017, at 12:21 PM, Ross Zwisler wrote: >> >> On Sat, Sep 09, 2017 at 05:10:26PM +0000, Soccer Liu wrote: >>> [snip] >>> >>> Based on the following Mount documentation below, I did mount this ext = fs >>> with ro and noloadAre there any other options that I could use to total= ly >>> eliminate those unexpected writes? > > [snip] > > Also, ext4 journal recovery will be done on the filesystem regardless of > whether it is mounted read-only or not. I thought the noload option should prevent journal recovery and thus be truly read-only. At least it worked on a read-only device for me. Regards Simon --=20 + privacy is necessary + using gnupg http://gnupg.org + public key id: 0x92FEFDB7E44C32F9 --=_zucker.schokokeks.org-32653-1505207029-0001-2 Content-Type: application/pgp-signature; name="signature.asc" Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEO7rfWMMObpFkF3n0kv79t+RMMvkFAlm3oukACgkQkv79t+RM MvkljhAAgL8vaZnFbstn2XSYgs7IZCUABJLur5cKUUwUFryZ/WDzWAQATaZvXh3V PP0i4X+sTKGMQPOqseu2mScFk+eauceN+T3NGkgGn9r3q95AbamLt7JPd/dnK1oG rRUB/kkEJlP69UAYbZQLgPcjzywy8RTqpntUWhFpNa9Kp/4KbreqR8vIJGL8Atzp gr1WC+mH7f6jwD4J/cB7NVRxReFgS3pY/dXm2JJvCMPcHE0x9dRSLtgE9jPSYktK ztMYXj243fJ+KCr1swlY8+UAfdvr2kpWXONGlcA33fPXVV90tBtnjSiXkm7Tm+fa +ZEmSOnCVGqKfVnWMJY6A9icrNv1lcMAAI7yt4YZXYCfiBG/9Bz3Zz36GNLKv46s zT0fsHNlBME/p8DsIOOIY4I2xTeDwsCwDcBmKb4lt1ylE8sgqjd1NGLW9WhoLFxj FN0Vk7zbuh6XDTowC2knfz2cZdYdtbqLmZHkXquuDRfPpASkoPUzkZZfHni0OpTT bNV+QNMs8ulZjMkfXun8LpwVaXdIq1hv82Xl5bfaRNCdaxG3JNHuCIaR6BetstNb L+AdPHrDoiZmOxhDW5RsHVVZMNe5ygQ1ENnUe6thIUa2A1V5djkDdraK/WG6BL3r YYF+OZ3K+ZpebTMpGgqGye+W7H2Jwrjjqeo0GBfv/yf+M1WKY/Y= =xnvw -----END PGP SIGNATURE----- --=_zucker.schokokeks.org-32653-1505207029-0001-2--