Re: [coLinux-devel] Possible bug with unionfs and colinux

[Sergio P. <spa...@zi...>]

Hi Henri,

> What type of filesystem is under the unionfs?
> Are the mounts different between coLinux and native Linux? Please check 
> differences from `mount` and `cat /proc/mounts`.
> 

I am using squashfs.

NATIVE LINUX:

ubuntu@live:~$ mount
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
tmpfs on /lib/modules/2.6.28-11-generic/volatile type tmpfs
(rw,mode=0755)
varrun on /var/run type tmpfs (rw,noexec,nosuid,nodev,mode=0755)
varlock on /var/lock type tmpfs (rw,noexec,nosuid,nodev,mode=1777)
udev on /dev type tmpfs (rw,mode=0755)
devshm on /dev/shm type tmpfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /tmp type tmpfs (rw,nodev,size=2022196k)
securityfs on /sys/kernel/security type securityfs (rw)
/sys/bus/usb on /proc/bus/usb type usbfs (rw)

ubuntu@live:~$ cat /proc/mounts

rootfs / rootfs rw 0 0
none /sys sysfs rw,nosuid,nodev,noexec 0 0
none /proc proc rw,nosuid,nodev,noexec 0 0
udev /dev tmpfs rw,mode=755 0 0
/dev/sdc1 /cdrom vfat
rw,noatime,fmask=0022,dmask=0022,codepage=cp437,iocharset=
iso8859-1 0 0
/dev/mapper/uncrypted /rofs squashfs ro 0 0
/dev/mapper/persist /media/pers ext3 rw,errors=continue,data=ordered 0 0
/dev/mapper/data /media/data ext3 rw,errors=continue,data=ordered 0 0
tmpfs /cow tmpfs rw,noatime 0 0
unionfs / unionfs
rw,noatime,dirs=/cow=rw:/rofs=ro,debug=4294967295,delete=white
out 0 0
unionfs /dev/.static/dev unionfs
rw,noatime,dirs=/cow=rw:/rofs=ro,debug=42949672
95,delete=whiteout 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec,mode=755 0 0
tmpfs /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /dev/shm tmpfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec,mode=755 0 0
tmpfs /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /tmp tmpfs rw,nodev,size=2022196k 0 0
securityfs /sys/kernel/security securityfs rw 0 0
/sys/bus/usb /proc/bus/usb usbfs rw 0 0

root@live:/home/ubuntu# modinfo squashfs
filename:       /lib/modules/2.6.28-11-generic/kernel/ubuntu/squashfs/squashfs.ko
license:        GPL
author:         Phillip Lougher <ph...@lo...>
description:    squashfs 3.2-r2-CVS, a compressed read-only filesystem
srcversion:     7626F567E1FBB5EDCFF9F67
depends:        
vermagic:       2.6.28-11-generic SMP mod_unload modversions 586 
root@live:/home/ubuntu# modinfo unionfs
filename:       /lib/modules/2.6.28-11-generic/kernel/ubuntu/unionfs/unionfs.ko
license:        GPL
description:    Unionfs 1.4 (http://unionfs.filesystems.org/)
author:         Filesystems and Storage Lab, Stony Brook University
(http://www.fsl.cs.sunysb.edu/)
srcversion:     61DAFD752F65FAF0D40207F
depends:        
vermagic:       2.6.28-11-generic SMP mod_unload modversions 586 
parm:           debug:Initial Unionfs debug value. (int)
root@live:/home/ubuntu# 

COLINUX:

ubuntu@live:~$ mount
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
tmpfs on /lib/modules/2.6.28-11-generic/volatile type tmpfs
(rw,mode=0755)
varrun on /var/run type tmpfs (rw,noexec,nosuid,nodev,mode=0755)
varlock on /var/lock type tmpfs (rw,noexec,nosuid,nodev,mode=1777)
udev on /dev type tmpfs (rw,mode=0755)
devshm on /dev/shm type tmpfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
securityfs on /sys/kernel/security type securityfs (rw)

ubuntu@live:~$ cat /proc/mounts

rootfs / rootfs rw 0 0
none /sys sysfs rw,nosuid,nodev,noexec 0 0
none /proc proc rw,nosuid,nodev,noexec 0 0
udev /dev tmpfs rw 0 0
fusectl /sys/fs/fuse/connections fusectl 0 0 
/dev/sda /cdrom vfat
rw,noatime,fmask=0022,dmask=0022,codepage=cp437,iocharset=
iso8859-1 0 0 0
tmpfs /cow tmpfs rw,noatime 0 0
unionfs / unionfs rw,noatime,dirs=/cow=rw:/rofs=ro 0 0
unionfs /dev/.static/dev unionfs rw,noatime,dirs=/cow=rw:/rofs=ro 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /dev/shm tmpfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec,mode=755 0 0
tmpfs /var/lock tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /tmp tmpfs rw,nodev,size=2022196k 0 0
securityfs /sys/kernel/security securityfs rw 0 0

root@live:/home/ubuntu# modinfo squashfs
filename:       /lib/modules/2.6.22.18-co-0.7.6/kernel/fs/squashfs/squashfs.ko
license:        GPL
author:         Phillip Lougher <ph...@lo...>
description:    squashfs 3.4, a compressed read-only filesystem
depends:        
vermagic:       2.6.22-18-co-0.7.6 preemp mod_unload 586 

root@live:/home/ubuntu# modinfo unionfs
filename:       /lib/modules/2.6.22.18-co-0.7.6/kernel/fs/unionfs/unionfs.ko
license:        GPL
description:    Unionfs 2.5.4 (for 2.6.22.19)
(http://unionfs.filesystems.org/)
author:         Filesystems and Storage Lab, Stony Brook University
(http://www.fsl.cs.sunysb.edu/)
depends:        
vermagic:        2.6.22.18-co-0.7.6 preemp mod_unload 586 
root@live:/home/ubuntu#