cygwin 1.7.6: find skipping over some directories on NTFS mount points

[Rolf Campbell]

On 2010-08-19 04:31, Corinna Vinschen wrote:
> On Aug 18 18:50, Rolf Campbell wrote:
>> I have an 2nd NTFS disk mounted in a directory in my primary NTFS
>> disk.  When I use 'find' (with no arguments), it only displays a
>> small fraction of the files in the current directory.
>>
>> Using cygwin 1.7.5, it displayed about 100,000 files.
>> Using cygwin 1.7.6, it only displays the content of the first
>> top-level directory and then just stops.
>>
>> I tried out all the snapshots and narrowed it down to "20100618".
>> It worked correctly in "20100614" and does not work correctly in
>> "20100618".
>>
>> If I mount the disk as a normal drive and access it using
>> "/cygdrive", it displays all 100,0000 files with both 1.7.5 and
>> 1.7.6.
>
> That narrows down the problem to a specific change, but unfortunately
> I can not reproduce the problem.
>
> I assume, when you say you "mounted" the 2nd drive, you didn't mean a
> Cygwin mount but rather a Windows junction point, so your drive doesn't
> show up as D:, but as C:\DriveD in Windows, correct?
>
> At least, that's what I tested.  The drive has 1577 files and
> directories in multiple levels, and `find' always prints all of them,
> regardless whether the drive is mounted as drive or as juntion point.
> I also tried a Cygwin mount additionally, with the same result.
>
> Here are a couple of questions.  They are all related to the mount
> using a junction point.
>
> - When you call `ls -l' in the top-level dir of the junction point,
>    are directories recognized as directories?
>    How many links do the directories supposedly have (should be 1)?
>
> - Is it possible that this has something to do with permissions?
>    "acl" vs. "noacl".  Your cygcheck output doesn't point that out,
>    but who knows.
>
> - Eventually, under Cygwin 1.7.6, can you please send us the output of
>    `ls -l' of the top-level dir, and call `strace -o find.trace find' in
>    the top-level dir and send the strace output?  Please don't try this
>    with the *working* scenario, the strace of a find finding 100000 files
>    would be a bit... swollen.
>
>
> Corinna
>

NTFS Junction point: yes.  I used the builtin windowns tool "mountvol" 
to mount the disk in an empty directory.  It's technically mounted as 
"C:\.timemachine\3".

Output from "ls -l"
$ /bin/ls -l
total 6680
drwx------+ 1 Rolf           None         0 2010-04-17 16:06 ATI
drwx------+ 1 Rolf           None         0 2010-07-25 22:31 Books
drwx------+ 1 Rolf           None         0 2010-08-12 22:41 Config.Msi
drwx------+ 1 Rolf           None         0 2010-05-30 22:31 Documents 
and Settings
drwx------+ 1 Rolf           None         0 2010-08-08 16:40 Lisa
drwx------+ 1 Rolf           None         0 2010-07-28 09:18 Mail
drwx------+ 1 Rolf           None         0 2010-05-24 23:18 Old
drwx------+ 1 Rolf           None         0 2010-06-01 22:53 Pictures
drwx------+ 1 Rolf           None         0 2010-08-11 21:46 Programs
drwx------+ 1 Rolf           None         0 2010-08-18 22:11 RECYCLER
drwx------+ 1 Rolf           None         0 2010-08-11 20:59 Saves
d---rwx---+ 1 Administrators SYSTEM       0 2010-06-19 19:09 System 
Volume Information
drwx------+ 1 Rolf           None         0 2010-08-10 08:34 Torrent
drwx------+ 1 Rolf           None         0 2010-06-08 21:49 cygwin
-rwx------+ 2 Rolf           None   6839239 2010-08-19 08:43 list.txt
drwx------+ 1 Rolf           None         0 2010-08-10 08:34 mp3
drwxr-xr-x+ 1 Rolf           None         0 2010-05-22 14:52 shaRepot


I do not set the CYGWIN environmental variable when running find.

I noticed something of interest, if I run "find", then it only descends 
into the "ATI" directory.  After exhausting every file/dir under ATI, it 
terminates.  But, if I run "find -maxdepth 2", it shows all correct 
output (it correctly enters all top-level and 2nd level directories -- 
it does NOT stop after leaving ATI).

Also, ls -R works just fine (showing all 100,000 files).

I've attached the strace output from find (compressed because it was > 
1Meg).

I tried different maxdepth settings, they all worked up until 6, then 
they fail as find exits the ATI directory.
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