Hi Miklos, Is there an update on this patch? I checked OverlayFS in 4.1-rc5 and noticed that the issue is still there. I also observed something interesting/confusing applying this patch to 3.18. When Docker 1.5 sets up a container, the path into OverlayFS for a bind mounted file is not visible in /proc/<pid>/mountinfo which means that the patch has been effective. But when using Docker 1.7, the path is visible again. See below as an example for /etc/hosts: Using Docker 1.5 # docker run -d busybox:latest ... # cat /proc/<pid>/mountinfo ... 123 114 8:2 /docker/containers/<container-id>/hosts /etc/hosts rw,relatime - ext4 /dev/sda2 rw,data=ordered Using Docker 1.7 # docker run -d busybox:latest ... # cat /proc/<pid>/mountinfo ... 77 68 8:2 /docker/containers/<container-id>/hosts /sda2/docker/overlay/<container-id>/merged/etc/hosts rw,relatime - ext4 /dev/sda2 rw,data=ordered I verified that the mount system call to set up the container's filesystem is identical between Docker 1.5 and 1.7. Any idea as to what may be causing this problem? --Saied On Wed, Apr 15, 2015 at 8:07 AM, Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > On Wed, Apr 15, 2015 at 10:50 AM, Andrew Vagin <avagin@xxxxxxxx> wrote: >> Hello Miklos and Everyone else, >> >> We have a report that a container with overlayfs can't be checkpointed. >> >> To dump file descriptors we get information from /proc/pid/fd/ and /proc/pid/fdinfo. >> >> But in case of overlayfs we see unexpected values there. >> >> /proc/PID/fdinfo/FD contains mnt_id which isn't presented in /proc/pid/mountinfo. >> /proc/PID/fd/FD does not contain an absolute path to the opened file. >> >> Can someone help to fix these issues? > > See this: > > https://lkml.org/lkml/2015/3/20/372 > > Al didn't like that patch. But it definitely will be fixed, one way > or the other, in the near future. > > Thanks, > Miklos -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
