GNU bug report logs - #10349
tail: fix --follow on FhGFS remote file systems

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Message #31 received at 10349 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Alan Curry <pacman-cu <at> kosh.dhis.org>
Cc: 10349 <at> debbugs.gnu.org, Sven Breuner <sven.breuner <at> itwm.fraunhofer.de>,
	Eric Paris <eparis <at> redhat.com>, Jim Meyering <jim <at> meyering.net>,
	Bob Proulx <bob <at> proulx.com>
Subject: Re: bug#10349: tail: fix --follow on FhGFS remote file systems
Date: Fri, 23 Dec 2011 00:08:33 +0000

On 12/22/2011 11:48 PM, Pádraig Brady wrote:
> On 12/22/2011 09:50 PM, Alan Curry wrote:
>> Bob Proulx writes:
>>>
>>> Jim Meyering wrote:
>>>> Are there so many new remote file systems coming into use now?
>>>> That are not listed in /usr/include/linux/magic.h?
>>>
>>> The past can always be enumerated.  The future is always changing.  It
>>> isn't possible to have a complete list of future items.  It is only
>>> possible to have a complete list of past items.  The future is not yet
>>> written.
>>
>> Between past and future is the present, i.e. the currently running kernel.
>> Shouldn't it return an error when you use an interface that isn't implemented
>> by the underlying filesystem? Why doesn't this happen?
> 
> That's a fair point.
> 
> Eric shouldn't some/all remote file systems in the kernel
> return ENOTSUP for inotify operations?

Oh right, as Sven points out,
a notification _is_ sent for local processes modifying a remote file.
I guess we'd need a IN_REMOTE flag (send remote events too), which
remote file systems would return ENOTSUP if they don't support that.
That's getting a bit awkward though.

cheers,
Pádraig.

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