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authorEric W. Biederman <ebiederm@xmission.com>2007-02-12 11:52:56 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-12 20:48:31 +0300
commit04a2e6a5cbf84e85fe86de0a18f6509b147e1d89 (patch)
tree67dd67d2c4c18e5c36654dfe569e3085bd262ba5 /include/linux/kernel.h
parent8d42db189ca99703f0f4f91c477cb54808c8eaaa (diff)
downloadlinux-04a2e6a5cbf84e85fe86de0a18f6509b147e1d89.tar.xz
[PATCH] pid: make session_of_pgrp use struct pid instead of pid_t
To properly implement a pid namespace I need to deal exclusively in terms of struct pid, because pid_t values become ambiguous. To this end session_of_pgrp is transformed to take and return a struct pid pointer. To avoid the need to worry about reference counting I now require my caller to hold the appropriate locks. Leaving callers repsonsible for increasing the reference count if they need access to the result outside of the locks. Since session_of_pgrp currently only has one caller and that caller simply uses only test the result for equality with another process group, the locking change means I don't actually have to acquire the tasklist_lock at all. tiocspgrp is also modified to take and release the lock. The logic there is a little more complicated but nothing I won't need when I convert pgrp of a tty to a struct pid pointer. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kernel.h')
-rw-r--r--include/linux/kernel.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 3531764318f2..9ddf25c21538 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -134,7 +134,8 @@ extern unsigned long long memparse(char *ptr, char **retptr);
extern int core_kernel_text(unsigned long addr);
extern int __kernel_text_address(unsigned long addr);
extern int kernel_text_address(unsigned long addr);
-extern int session_of_pgrp(int pgrp);
+struct pid;
+extern struct pid *session_of_pgrp(struct pid *pgrp);
extern void dump_thread(struct pt_regs *regs, struct user *dump);