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From: "Steven J. Magnani" <steve@digidescorp.com>
To: Namjae Jeon <linkinjeon@gmail.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
	Al Viro <viro@zeniv.linux.org.uk>,
	akpm@linux-foundation.org, bfields@fieldses.org,
	linux-kernel@vger.kernel.org,
	Namjae Jeon <namjae.jeon@samsung.com>,
	Ravishankar N <ravi.n1@samsung.com>,
	Amit Sahrawat <a.sahrawat@samsung.com>
Subject: Re: [PATCH v2 1/5] fat: allocate persistent inode numbers
Date: Fri, 07 Sep 2012 07:15:37 -0500	[thread overview]
Message-ID: <1347020137.2223.13.camel@iscandar.digidescorp.com> (raw)
In-Reply-To: <CAKYAXd-QtSYy4SQErVTXrxcv=YhFzhOm3PKpj=HoZKmpAG7vGQ@mail.gmail.com>

On Fri, 2012-09-07 at 16:01 +0900, Namjae Jeon wrote: 
> Hi. OGAWA.
> 
> I checked read-only option for export on FAT.
> I think that there are 3 approaches as mentioned below.
> 
> 1. As per the current scenario – user already has the option of
> setting ‘ro’ in /etc/exports – so that can also be used to make it
> read-only.
> 	
> 2. Forcefully set to “read-only” while executing FAT export operation.
> -> As you know, we can set read-only(ro) export in /etc/exports.
> If we set read-only export regardless of /etc/exports, This is "HACK"
> and it will work regardless of user setting.
> 
> 3. When FAT is mounted with -onfs option,-> Make it ‘ro’ at the mount
> time itself.
> -> It is simple to implement, but VFAT of NFS Server will be set to
> read-only as well as NFS client.

I argue against (2) and (3). A change that drops any possibility of
NFS-mounting VFAT filesystems read-write will break my use case. Where
ESTALE is an issue, there are client-side solutions, either mounting
with lookupcache=none (which admittedly has a severe performance impact)
or the VFS patches to handle ESTALE that are working their way towards
mainline. I recognize that not everyone can take advantage of
client-side features, but options (2) and (3) make life worse for those
who can.
------------------------------------------------------------------------
Steven J. Magnani               "I claim this network for MARS!
www.digidescorp.com              Earthling, return my space modulator!"

#include <standard.disclaimer>



  reply	other threads:[~2012-09-07 12:15 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-04 15:57 [PATCH v2 1/5] fat: allocate persistent inode numbers Namjae Jeon
2012-09-04 16:17 ` Al Viro
2012-09-05 14:08   ` Namjae Jeon
2012-09-05 14:56     ` OGAWA Hirofumi
2012-09-06  6:46       ` Namjae Jeon
2012-09-06 12:19         ` OGAWA Hirofumi
2012-09-06 13:39           ` Namjae Jeon
2012-09-07  7:01             ` Namjae Jeon
2012-09-07 12:15               ` Steven J. Magnani [this message]
2012-09-09  9:32                 ` OGAWA Hirofumi
2012-09-09 11:29                   ` OGAWA Hirofumi
2012-09-10 12:03                     ` Namjae Jeon
2012-09-10 14:00                       ` OGAWA Hirofumi
2012-09-11 12:00                         ` Namjae Jeon
2012-09-11 12:31                           ` OGAWA Hirofumi
2012-09-11 15:13                             ` Namjae Jeon
2012-09-11 15:47                               ` OGAWA Hirofumi
2012-09-12 14:12                                 ` Namjae Jeon
2012-09-12 14:32                                   ` J. Bruce Fields
2012-09-12 17:03                                     ` OGAWA Hirofumi
2012-09-12 17:11                                       ` J. Bruce Fields
2012-09-12 17:38                                         ` OGAWA Hirofumi
2012-09-12 17:45                                           ` J. Bruce Fields
2012-09-12 18:49                                             ` OGAWA Hirofumi
2012-09-13  8:11                                               ` Namjae Jeon
2012-09-13  8:33                                                 ` OGAWA Hirofumi
2012-09-13 11:20                                                   ` J. Bruce Fields
2012-09-13 12:17                                                     ` OGAWA Hirofumi
2012-09-13 14:24                                                       ` Namjae Jeon
2012-09-13 14:46                                                         ` J. Bruce Fields
2012-09-13 15:34                                                           ` OGAWA Hirofumi
2012-09-14  8:51                                                             ` Namjae Jeon
2012-09-10 12:28                   ` Steven J. Magnani

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