linux-kernel - Wtrlt: Q: NFS: directory XX/YYY contains a readdir loop.Please contact your server vendor.

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Message-Id: <520E162A020000A100012427@gwsmtp1.uni-regensburg.de>
Date:	Fri, 16 Aug 2013 12:08:10 +0200
From:	"Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
To:	<linux-kernel@...r.kernel.org>
Subject: Wtrlt: Q:  NFS: directory XX/YYY contains a readdir
 loop.Please contact your server vendor.

Re-sent due to "5.7.1 Content-Policy reject msg: The capital Triple-X in subject is way too often associated with junk email, please rephrase. ":

>>> "Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de> schrieb am 16.08.2013 um
10:29 in Nachricht <520E15EF.ED38.00A1.0@...uni-regensburg.de>:
> Hi,
> 
> recently I found out that we his the "NFS: directory in/mdoc contains a 
> readdir loop.Please contact your server vendor." frequently on an NFS-Client 
> running SLES11 SP2 (3.0.80-0.7-default). The NFS server is also SLES11 SP2, and 
> the exported filesystem is ext3 with "dir_index" on.
> 
> SLES support suggested to turn off "dir_index" in ext3, which "should be 
> safe".
> 
> I googled the problem, and I found some (to me) vague description by Ted Tso 
> ("If not readdir() then what?") back in 2011 referring to ext3.
> 
> Now I wonder: Is this problem restricted to just ext3, or to any filesystem?
> 
> We have (and I cannot change it) directories with many files, even if just 
> temporary.
> 
> The statistics say: "122431/524288 files (3.4% non-contiguous), 
> 1230006/2097152 blocks"
> 
> The biggest directory has almost 1MB in size, but just about 16513 directory 
> entries.
> 
> I'm wondering whether "directory compaction" (compact slots of removed 
> entries) would help with the problem. In HP-UX VxFS you could do directory 
> compation online...
> 
> If you can explain the relationship of ext3 and other filesystems with this 
> bug, please reply keeping the CC:
> 
> Thank you,
> Ulrich




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