Date:	Fri, 30 Dec 2011 20:00:46 +0200
From:	Konstantinos Skarlatos <k.skarlatos@...il.com>
To:	Jeff Layton <jlayton@...hat.com>
CC:	linux-kernel@...r.kernel.org, linux-cifs@...r.kernel.org
Subject: Re: cifs: ls of mount point gives input/output error (probably related
 to CIFS: getdents() broken for large dirs)

On 30/12/2011 3:11 μμ, Jeff Layton wrote:
> On Fri, 30 Dec 2011 11:04:59 +0200
> Konstantinos Skarlatos<k.skarlatos@...il.com>  wrote:
>
>> On 29/12/2011 3:54 μμ, Konstantinos Skarlatos wrote:
>>> On Πέμπτη, 29 Δεκέμβριος 2011 3:39:30 μμ, Jeff Layton wrote:
>>>> On Thu, 29 Dec 2011 12:30:18 +0200
>>>> Konstantinos Skarlatos<k.skarlatos@...il.com>   wrote:
>>>>
>>>>> On 29/12/2011 4:04 πμ, Jeff Layton wrote:
>>>>>> On Thu, 29 Dec 2011 02:08:57 +0200
>>>>>> Konstantinos Skarlatos<k.skarlatos@...il.com>    wrote:
>>>>>>
>>>>>>> I mount via cifs a windows XP share, df gives me correct sizes,
>>>>>>> but when
>>>>>>> I ls the mount point i get input/output error.
>>>>>>> strace: http://pastebin.com/WXf8M1nu
>>>>>>>
>>>>>>> mount --verbose -t cifs -o username=administrator,password=blahblah
>>>>>>> //192.168.0.11/jobs /mnt/backups/montaz/jobs
>>>>>>> mount.cifs kernel mount options:
>>>>>>> ip=192.168.0.11,unc=\\192.168.0.11\jobs,,ver=1,user=administrator,pass=********
>>>>>>>
>>>>>>>
>>>>>>> df
>>>>>>> //192.168.0.11/jobs                                       114464
>>>>>>> 105196      9268  92% /mnt/backups/montaz/jobs
>>>>>>>
>>>>>>> ls /mnt/backups/montaz/jobs/
>>>>>>> ls: reading directory /mnt/backups/montaz/jobs/: Input/output error
>>>>>>> total 0
>>>>>>>
>>>>>>> the fun thing is that i can cd to a lower level directory, and ls
>>>>>>> works
>>>>>>> fine there! only the mount point has the problem
>>>>>>>
>>>>>>> ls /mnt/backups/montaz/jobs/test
>>>>>>> total 44K
>>>>>>> drwxr-xr-x 1 root root    0 Apr 30  2010 blah blah/
>>>>>>> ......
>>>>>>>
>>>>>>> kernel version 3.2rc7
>>>>>>>
>>>>>>> this seems to be related to :
>>>>>>> https://lkml.org/lkml/2011/8/1/427
>>>>>>> Re: [3.0.0+][Regression][Bisected] CIFS: getdents() broken for
>>>>>>> large dirs
>>>>>>>
>>>>>> Hmmm, maybe. What makes you think that it's related? What sort of
>>>>>> server are you seeing this against?
>>>>> Windows XP service pack 2 (greek)
>>>>
>>>> How many files are in the directory?
>>>>
>>> 140 folders and 20 files
>>>
>> Attached is a tcp dump of my session.
> I tried reproducing this here, but wasn't able to. Testing against my
> xp box worked fine.
>
> Most likely, the FIND_FILE responses are falling afoul of the code in
> coalesce_t2 or check2ndT2. Unfortunately that code is pretty
> complicated and I'm not certain what the problem actually is...
>
> One thing that's interesting is that the total data being sent in the
> request is rather large (16336 bytes). I think that's legit, but maybe
> it's exceeding the end of the buffer once we try to coalesce it.
>
> Would it be possible to get the cFYI output from this test?
I did not get a cFYI output from that test, but i redid a 
mount-ls-umount and am attaching the tcpdump
Also here http://pastebin.com/J20uC6kU you can find the cifsFYI and the 
contents of /proc/fs/cifs/DebugData form the same test
>
> Is this a regression? Did it work with earlier kernels and only
> recently start failing?
>
I do not know, and i am a bit afraid to downgrade this machine below 3.0 
due to some changes arch linux has introduced recently. I can always set 
up a few virtual machines though, and i can even request permission from 
my company to give you shell access if you like. Which kernel versions 
would you like me to test?

Download attachment "cifs-traffic2.pcap" of type "application/octet-stream" (23203 bytes)

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