[Containers] Start using struct pid.
Eric W. Biederman
ebiederm at xmission.com
Tue Aug 15 11:21:11 PDT 2006
In the last round of cleaning up the pid hash table a more
general struct pid was introduced, that can be referenced
counted.
With the more general struct pid most if not all places where
we store a pid_t we can now store a struct pid * and remove
the need for a hash table lookup, and avoid any possible problems
with pid roll over.
Looking forward to the pid namespaces struct pid * gives us
an absolute form a pid so we can compare and use them without
caring which pid namespace we are in.
This patchset introduces the infrastructure needed to use
struct pid instead of pid_t, and then it goes on to convert
two different kernel users that currently store a pid_t value.
There are a lot more places to go but this is enough to get the
basic idea.
Before we can merge a pid namespace patch all of the kernel pid_t
users need to be examined. Those that deal with user space processes
need to be converted to using a struct pid *. Those that deal with
kernel processes need to converted to using the kthread api. A rare
few that only use their current processes pid values get to be left
alone.
Eric
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