forked from rubenslte/android_kernel_samsung_msm8226
Eric W. Biederman
80f4b770f4
Assign a unique proc inode to each namespace, and use that inode number to ensure we only allocate at most one proc inode for every namespace in proc. A single proc inode per namespace allows userspace to test to see if two processes are in the same namespace. This has been a long requested feature and only blocked because a naive implementation would put the id in a global space and would ultimately require having a namespace for the names of namespaces, making migration and certain virtualization tricks impossible. We still don't have per superblock inode numbers for proc, which appears necessary for application unaware checkpoint/restart and migrations (if the application is using namespace file descriptors) but that is now allowd by the design if it becomes important. I have preallocated the ipc and uts initial proc inode numbers so their structures can be statically initialized. Change-Id: I01d42c2f051fd74b1474d9d8378ccc78174cf3cf Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Git-commit: f80cd4676998eb352d1a8b9df0f3663537a9ce93 Git-repo: https://android.googlesource.com/kernel/common/ [schikk@codeaurora.org: Resolved merge conflicts ] CRs-Fixed: 901628 Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>