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Message-ID: <20090910061227.GF25883@us.ibm.com>
Date: Wed, 9 Sep 2009 23:12:27 -0700
From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: Oren Laadan <orenl@...columbia.edu>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Alexey Dobriyan <adobriyan@...il.com>,
Pavel Emelyanov <xemul@...nvz.org>,
Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
Nathan Lynch <nathanl@...tin.ibm.com>, arnd@...db.de,
Containers <containers@...ts.linux-foundation.org>,
sukadev@...ibm.com
Subject: [RFC][v6][PATCH 7/9]: Define do_fork_with_pids()
Subject: [RFC][v6][PATCH 7/9]: Define do_fork_with_pids()
do_fork_with_pids() is same as do_fork(), except that it takes an
additional, 'pid_set', parameter. This parameter, currently unused,
specifies the set of target pids of the process in each of its pid
namespaces.
Changelog[v6]:
- (Nathan Lynch, Arnd Bergmann, H. Peter Anvin, Linus Torvalds)
Change 'pid_set.pids' to a 'pid_t pids[]' so size of 'struct pid_set'
is constant across architectures.
- (Nathan Lynch) Change 'pid_set.num_pids' to 'unsigned int'.
Changelog[v4]:
- Rename 'struct target_pid_set' to 'struct pid_set' since it may
be useful in other contexts.
Changelog[v3]:
- Fix "long-line" warning from checkpatch.pl
Changelog[v2]:
- To facilitate moving architecture-inpdendent code to kernel/fork.c
pass in 'struct target_pid_set __user *' to do_fork_with_pids()
rather than 'pid_t *' (next patch moves the arch-independent
code to kernel/fork.c)
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Acked-by: Serge Hallyn <serue@...ibm.com>
Reviewed-by: Oren Laadan <orenl@...columbia.edu>
---
include/linux/sched.h | 3 +++
include/linux/types.h | 5 +++++
kernel/fork.c | 16 ++++++++++++++--
3 files changed, 22 insertions(+), 2 deletions(-)
Index: linux-2.6/include/linux/sched.h
===================================================================
--- linux-2.6.orig/include/linux/sched.h 2009-09-09 19:06:20.000000000 -0700
+++ linux-2.6/include/linux/sched.h 2009-09-09 19:07:45.000000000 -0700
@@ -2054,6 +2054,9 @@ extern int disallow_signal(int);
extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
+extern long do_fork_with_pids(unsigned long, unsigned long, struct pt_regs *,
+ unsigned long, int __user *, int __user *,
+ struct pid_set __user *pid_set);
struct task_struct *fork_idle(int);
extern void set_task_comm(struct task_struct *tsk, char *from);
Index: linux-2.6/include/linux/types.h
===================================================================
--- linux-2.6.orig/include/linux/types.h 2009-09-09 19:06:20.000000000 -0700
+++ linux-2.6/include/linux/types.h 2009-09-09 19:07:45.000000000 -0700
@@ -204,6 +204,11 @@ struct ustat {
char f_fpack[6];
};
+struct pid_set {
+ unsigned int num_pids;
+ pid_t pids[];
+};
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_TYPES_H */
Index: linux-2.6/kernel/fork.c
===================================================================
--- linux-2.6.orig/kernel/fork.c 2009-09-09 19:07:40.000000000 -0700
+++ linux-2.6/kernel/fork.c 2009-09-09 19:07:45.000000000 -0700
@@ -1332,12 +1332,13 @@ struct task_struct * __cpuinit fork_idle
* It copies the process, and if successful kick-starts
* it and waits for it to finish using the VM if required.
*/
-long do_fork(unsigned long clone_flags,
+long do_fork_with_pids(unsigned long clone_flags,
unsigned long stack_start,
struct pt_regs *regs,
unsigned long stack_size,
int __user *parent_tidptr,
- int __user *child_tidptr)
+ int __user *child_tidptr,
+ struct pid_set __user *pid_setp)
{
struct task_struct *p;
int trace = 0;
@@ -1440,6 +1441,17 @@ long do_fork(unsigned long clone_flags,
return nr;
}
+long do_fork(unsigned long clone_flags,
+ unsigned long stack_start,
+ struct pt_regs *regs,
+ unsigned long stack_size,
+ int __user *parent_tidptr,
+ int __user *child_tidptr)
+{
+ return do_fork_with_pids(clone_flags, stack_start, regs, stack_size,
+ parent_tidptr, child_tidptr, NULL);
+}
+
#ifndef ARCH_MIN_MMSTRUCT_ALIGN
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif
--
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