[Crash-utility] Support for namespaces in mount (option -n)

Hi Dave, This patch try to support namespaces. The following sample use two processes having different namespaces. For example, /sys and /dev/shm are presents in one namespace and not in the other. Olivier. crash> mount -n 1 VFSMOUNT SUPERBLK TYPE DEVNAME DIRNAME f7eab780 f7eaf200 rootfs rootfs / f7eabf00 f784d800 tmpfs /dev /dev f7eab080 f7ce5600 ext3 /dev/root / f7eabf80 f7ea3c00 proc /proc /proc f7eab100 f7a7ae00 usbfs /proc/bus/usb /proc/bus/usb f7eab880 f7eaf400 sysfs /sys /sys f7eab980 f7d72200 devpts /dev/devpts /dev/pts f7eaba80 f7af5c00 tmpfs /dev/shm /dev/shm f7eabb00 f7029400 ext3 /dev/sda3 /mnt/sda3 f7eabb80 f7209a00 binfmt_misc none /proc/sys/fs/binfmt_misc f7eabd80 f7af6c00 rpc_pipefs sunrpc /var/lib/nfs/rpc_pipefs f7eabc00 f6de5400 autofs automount(pid2367) /net f6e44780 c1f63000 autofs automount(pid2357) /misc f6e44200 f6c4d800 nfsd nfsd /proc/fs/nfsd crash> mount -n 3287 VFSMOUNT SUPERBLK TYPE DEVNAME DIRNAME f6e44180 f7eaf200 rootfs rootfs / f6e44700 f7ce5600 ext3 /dev/root / f6e44680 f784d800 tmpfs /dev /dev f6e44600 f7d72200 devpts /dev/devpts /dev/pts f6e44580 f7ea3c00 proc /proc /proc f6e44500 f7a7ae00 usbfs /proc/bus/usb /proc/bus/usb f6e44480 f7209a00 binfmt_misc none /proc/sys/fs/binfmt_misc f6e44300 f7029400 ext3 /dev/sda3 /mnt/sda3 f6e44280 f7af6c00 rpc_pipefs sunrpc /var/lib/nfs/rpc_pipefs f7eaba00 f6de5400 autofs automount(pid2367) /net f7eabe00 c1f63000 autofs automount(pid2357) /misc ---------------------------------------------------------------- Ce message a ete envoye par IMP, grace a l'Universite Paris 10 Nanterre