2 Commits

Author	SHA1	Message	Date
Haitao Li	35c14c6b56	sys/mount_linux: use pipe for communicating mount result ... forkAndMountat forks a process to chdir then mount layers. Signals are blocked (using runtime_beforeFork) during fork. There is a race condition that the child process finishes before the parent process is scheduled and can unblock signal handling. The SIGCHLD signal sent from the finished process may have been delivered to the shim process's reaper thread and caused the parent process fail with ECHLD error. This patch sets up a pipe for communication between child and parent instead of waiting for child exit status. Fixes #4009. Signed-off-by: Haitao Li <hli@atlassian.com>	2020-04-09 09:50:41 +10:00
Wei Fu	67b54c6670	Support >= 128 layers in overlayfs snapshots ... Auto-detect longest common dir in lowerdir option and compact it if the option size is hitting one page size. If does, Use chdir + CLONE to do mount thing to avoid hitting one page argument buffer in linux kernel mount. Signed-off-by: Wei Fu <fhfuwei@163.com>	2018-08-07 10:59:36 +08:00