Re:mount namespaces issue

["remaper" <yp.fangdong@xxxxxxxxx>]

i test this on centos and ubuntu, in a tmp dir, method:
touch root.img
mkdir hda
dd if=/dev/zero of=./root.img bs=1M count=100
mkfs.ext3 root.img
strace mount -o loop root.img hda/ 2>log

and then: cat log | grep hda

on centos:
execve("/bin/mount", ["mount", "-o", "loop", "root.img", "hda/"], [/* 28 vars */]) = 0
open("/proc/mounts", O_RDONLY|O_LARGEFILE) = 3
stat64("/sbin/mount.ext3", 0xbfaa4484)  = -1 ENOENT (No such file or directory)
mount("/dev/loop0", "hda/", "ext3", MS_MGC_VAL, NULL) = 0

on ubuntu:
execve("/bin/mount", ["mount", "-o", "loop", "rootfs.img", "hda/"], [/* 53 vars */]) = 0
stat64("/sbin/mount.ext3", 0xbfa83590)  = -1 ENOENT (No such file or directory)
mount("/dev/loop0", "hda/", "ext3", MS_MGC_VAL, NULL) = 0

may be you can see here, the different between centos and ubuntu:
open("/proc/mounts", O_RDONLY|O_LARGEFILE) = 3

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