Re: [PATCH v2 1/5] fat: allocate persistent inode numbers

[Steven J. Magnani]

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 â user already has the option of
> setting âroâ in /etc/exports â so that can also be used to make it
> read-only.
> 	
> 2. Forcefully set to âread-onlyâ 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 âroâ 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>


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