GNU bug report logs - #9812
Problem with "tail -f" on GPFS filesystem // coreutils package

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Package: coreutils;

Reported by: Martial-externe BORNET <martial-externe.bornet <at> edf.fr>

Date: Thu, 20 Oct 2011 16:21:02 UTC

Severity: normal

Done: Pádraig Brady <P <at> draigBrady.com>

Bug is archived. No further changes may be made.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Martial-externe BORNET <martial-externe.bornet <at> edf.fr>
Subject: bug#9812: closed (Re: bug#9812: Problem with "tail -f" on GPFS
 filesystem // coreutils package)
Date: Thu, 20 Oct 2011 18:38:02 +0000
[Message part 1 (text/plain, inline)]
Your bug report

#9812: Problem with "tail -f" on GPFS filesystem // coreutils package

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 9812 <at> debbugs.gnu.org.

-- 
9812: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9812
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
[Message part 2 (message/rfc822, inline)]
From: Pádraig Brady <P <at> draigBrady.com>
To: Martial-externe BORNET <martial-externe.bornet <at> edf.fr>
Cc: meskes <at> debian.org, Laurent LE-SAOUT <laurent.le-saout <at> edf.fr>,
	Antonio-externe RUSSO <antonio-externe.russo <at> edf.fr>,
	marc_millot <at> fr.ibm.com,
	Loic-externe LAUREOTE <loic-externe.laureote <at> edf.fr>,
	9812-done <at> debbugs.gnu.org, Remi PALANCHER <remi.palancher <at> edf.fr>,
	Christian SOBRADO <christian.sobrado <at> edf.fr>,
	Dominique PERRUCHON <dominique.perruchon <at> edf.fr>,
	Stephan GORGET <stephan.gorget <at> edf.fr>,
	Bruno-externe AGNERAY <bruno-externe.agneray <at> edf.fr>
Subject: Re: bug#9812: Problem with "tail -f" on GPFS filesystem // coreutils
	package
Date: Thu, 20 Oct 2011 19:29:26 +0100
On 10/20/2011 03:52 PM, Martial-externe BORNET wrote:
> Good afternoon,
> 
> Could you please add the following line to the src/fs.h file :
> 
> # define S_MAGIC_GPFS 0x47504653

That was actually done in the recently released 8.13

> 
> and add the following line to the switch() of the fremote() function in 
> the src/tail.c file, in the coreutils package :
> 
> case S_MAGIC_GPFS:
> 
> or do you prefer me to send you a patch for these files ? (I'm not used to 
> that yet, but I'll do it if you need it).
> 
> These addings fix a "tail -f" problem with the GPFS filesystem.
> 
> I'm waiting for your reply.
> Thank you for your help regarding this fix.

Since you took the time to identify the fix
I'm applying this in your name.
Please advise if you'd like a different email address.
Note one can work around the issue without a patch
for the moment by using the currently undocumented ---disable-inotify option.

cheers,
Pádraig.

commit c0ca70013d7bbe60143910828e32146f3e94cc02
Author: Martial Bornet <martial-externe.bornet <at> edf.fr>
Date:   Thu Oct 20 19:22:31 2011 +0100

    tail: fix --follow on GPFS remote file systems

    * src/tail.c (fremote): Recognize GPFS as a remote
    file system outside the scope of inotify.

diff --git a/src/tail.c b/src/tail.c
index f315776..1641a12 100644
--- a/src/tail.c
+++ b/src/tail.c
@@ -904,6 +904,7 @@ fremote (int fd, const char *name)
         case S_MAGIC_FUSEBLK:
         case S_MAGIC_FUSECTL:
         case S_MAGIC_GFS:
+        case S_MAGIC_GPFS:
         case S_MAGIC_KAFS:
         case S_MAGIC_LUSTRE:
         case S_MAGIC_NCP:

[Message part 3 (message/rfc822, inline)]
From: Martial-externe BORNET <martial-externe.bornet <at> edf.fr>
To: bug-coreutils <at> gnu.org,
	meskes <at> debian.org
Cc: Laurent LE-SAOUT <laurent.le-saout <at> edf.fr>,
	Antonio-externe RUSSO <antonio-externe.russo <at> edf.fr>,
	marc_millot <at> fr.ibm.com,
	Loic-externe LAUREOTE <loic-externe.laureote <at> edf.fr>,
	Dominique PERRUCHON <dominique.perruchon <at> edf.fr>,
	Remi PALANCHER <remi.palancher <at> edf.fr>,
	Christian SOBRADO <christian.sobrado <at> edf.fr>,
	Stephan GORGET <stephan.gorget <at> edf.fr>,
	Bruno-externe AGNERAY <bruno-externe.agneray <at> edf.fr>
Subject: Problem with "tail -f" on GPFS filesystem // coreutils package
Date: Thu, 20 Oct 2011 16:52:15 +0200
[Message part 4 (text/plain, inline)]
Good afternoon,

Could you please add the following line to the src/fs.h file :

# define S_MAGIC_GPFS 0x47504653

and add the following line to the switch() of the fremote() function in 
the src/tail.c file, in the coreutils package :

case S_MAGIC_GPFS:

or do you prefer me to send you a patch for these files ? (I'm not used to 
that yet, but I'll do it if you need it).

These addings fix a "tail -f" problem with the GPFS filesystem.

I'm waiting for your reply.
Thank you for your help regarding this fix.

Kind regards,

Martial Bornet
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