Re: cifs: ls of mount point gives input/output error (probably related to CIFS: getdents() broken for large dirs)

Konstantinos Skarlatos
2011-12-30T18:00:52Z

[-- Attachment #1: Type: text/plain, Size: 3320 bytes --]

On 30/12/2011 3:11 μμ, Jeff Layton wrote:
> On Fri, 30 Dec 2011 11:04:59 +0200
> Konstantinos Skarlatos<k.skarlatos@gmail.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@gmail.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@gmail.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?

[-- Attachment #2: cifs-traffic2.pcap --]
[-- Type: application/octet-stream, Size: 23203 bytes --]