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    pid namespaces: changes to show virtual ids to user · b488893a
    Pavel Emelyanov 提交于
    This is the largest patch in the set. Make all (I hope) the places where
    the pid is shown to or get from user operate on the virtual pids.
    
    The idea is:
     - all in-kernel data structures must store either struct pid itself
       or the pid's global nr, obtained with pid_nr() call;
     - when seeking the task from kernel code with the stored id one
       should use find_task_by_pid() call that works with global pids;
     - when showing pid's numerical value to the user the virtual one
       should be used, but however when one shows task's pid outside this
       task's namespace the global one is to be used;
     - when getting the pid from userspace one need to consider this as
       the virtual one and use appropriate task/pid-searching functions.
    
    [akpm@linux-foundation.org: build fix]
    [akpm@linux-foundation.org: nuther build fix]
    [akpm@linux-foundation.org: yet nuther build fix]
    [akpm@linux-foundation.org: remove unneeded casts]
    Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
    Signed-off-by: NAlexey Dobriyan <adobriyan@openvz.org>
    Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
    Cc: Oleg Nesterov <oleg@tv-sign.ru>
    Cc: Paul Menage <menage@google.com>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    b488893a
migrate.c 22.8 KB