In the common case where the user is using /var/lib/docker and
an image with less than 60 layers, forking is not needed. Calculate
whether absolute paths can be used and avoid forking to mount in
those cases.
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Add option to skip kernel check for older kernels which have been patched to support multiple lower directories in overlayfs.
Fixes#24023
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Symlinks are currently not getting cleaned up when removing layers since only the root directory is removed.
On remove, read the link file and remove the associated link from the link directory.
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Adds a new overlay driver which uses multiple lower directories to create the union fs.
Additionally it uses symlinks and relative mount paths to allow a depth of 128 and stay within the mount page size limit.
Diffs and done directly over a single directory allowing diffs to be done efficiently and without the need fo the naive diff driver.
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
