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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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Last updated: Sun Jan 17 20:01:23 2021 UTC |
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.