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3 Commits

Author SHA1 Message Date
Derek McGowan c13a985fa1 Avoid fork on mount for overlay2 in common case 
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)
 2016-08-22 11:43:10 -07:00
Derek McGowan ad4b3e11fe overlay2: close read end of pipe on mount exec 
Use StdinPipe to ensure pipe is properly closed after startup

Fixes #23686

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
 2016-06-28 13:23:00 -07:00
Derek McGowan 23e5c94cfb Add separate overlay2 driver 
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)
 2016-06-08 00:16:01 -07:00