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Bug #60666 scandir doesn''t return entries on GlusterFS (redHat's) file system
Submitted: 2012-01-05 22:13 UTC Modified: 2012-01-10 13:18 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: hunter at yessoftware dot com Assigned:
Status: Open Package: Directory function related
PHP Version: 5.3.8 OS: CentOS 5.7
Private report: No CVE-ID: None
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From: hunter at yessoftware dot com
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 [2012-01-05 22:13 UTC] hunter at yessoftware dot com
Description:
------------
When I'm trying to scandir or opendir/readdir on GlusterFS Distributed volumes (mounted to some folder) I got something but not I'm expecting to obtainan: empty array even without . and .. entries, only . entry, 2-3 entries instead of >100 and so on.

Other ways (bash ls or perl opendir) works correctly.

for example:
distributed GlusterFS volume mounted to /sites/blog folder.
scandir("/sites/blog");

array(0) {
}
distributed GlusterFS volume mounted to /sites/other folder:
scandir("/sites/other");
array(1) {
  [0]=>
  string(1) "."
}
scandir("/sites/other/old");
array(3) {
  [0]=>
  string(1) "."
  [1]=>
  string(11) "1.2.0.2540"
  [2]=>
  string(11) "1.5.0.2559"
}




Test script:
---------------
<?php
clearstatcache();
var_dump(scandir('/sites/blogs'));
var_dump(scandir('/sites/other'));
var_dump(scandir('/sites/other/ms'));
?>


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 [2012-01-07 12:36 UTC] hunter at yessoftware dot com
PHP strace:
10458 open("/sites/cache", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
10458 fcntl64(3, F_SETFD, FD_CLOEXEC)   = 0
10458 getdents(3, 0x9d0640c, 32768)     = -1 EINVAL (Invalid argument)
10458 close(3)                          = 0
10458 write(1, "0\r\n", 3)              = 3
10458 open("/nonglustered/dir", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
10458 fcntl64(3, F_SETFD, FD_CLOEXEC)   = 0
10458 getdents(3, 0x9d0640c, 32768)     = 120
10458 getdents(3, 0x9d0640c, 32768)     = 0
10458 close(3)                          = 0
10458 write(1, "3\r\n", 3)              = 3
10458 close(0)                          = 0

Perl strace
open("/sites/other", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
brk(0x8608000)                          = 0x8608000
getdents64(3, /* 24 entries */, 32768)  = 1352
write(1, "12548855754ef9fb85723261.9149936"..., 38) = 38

So goal is to use getdents64 instead of getdents.

The original Linux getdents() system call did not handle large file systems and large file offsets. Consequently, Linux 2.4 added getdents64(), with wider types for the d_ino and d_off fields employed in the linux_dirent structure.
 [2012-01-10 13:18 UTC] hunter at yessoftware dot com
I solved it by rebuilding php with 
export CPPFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
./configure
 
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