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authorEric W. Biederman <ebiederm@xmission.com>2011-06-15 21:21:48 +0400
committerEric W. Biederman <ebiederm@xmission.com>2012-11-20 16:19:49 +0400
commit98f842e675f96ffac96e6c50315790912b2812be (patch)
treeed4dee9a6e54e3443e9f3f1614c8a2fcf9b31e0a /fs/ext4/inode.c
parentbf056bfa80596a5d14b26b17276a56a0dcb080e5 (diff)
downloadlinux-98f842e675f96ffac96e6c50315790912b2812be.tar.xz
proc: Usable inode numbers for the namespace file descriptors.
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. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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