Add time namespace support to unshare, controlled by CLONE_TIME.
Index: linux-2.6.17-mm-vtime/include/linux/sched.h
===================================================================
--- linux-2.6.17-mm-vtime.orig/include/linux/sched.h 2006-04-13 13:48:32.000000000 -0400
+++ linux-2.6.17-mm-vtime/include/linux/sched.h 2006-04-13 13:49:11.000000000 -0400
@@ -65,6 +65,7 @@ struct bio;
#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
+#define CLONE_TIME 0x04000000 /* Make a new time namespace */
/*
* List of flags we want to share for kernel threads,
Index: linux-2.6.17-mm-vtime/kernel/fork.c
===================================================================
--- linux-2.6.17-mm-vtime.orig/kernel/fork.c 2006-04-13 13:48:02.000000000 -0400
+++ linux-2.6.17-mm-vtime/kernel/fork.c 2006-04-13 13:49:11.000000000 -0400
@@ -1563,6 +1563,25 @@ static int unshare_semundo(unsigned long
return 0;
}
+static int unshare_time(unsigned long unshare_flags, struct time_ns **new)
+{
+ if(unshare_flags & CLONE_TIME){
+ *new = kmalloc(sizeof(struct time_ns), GFP_KERNEL);
+ if(*new == NULL)
+ return -ENOMEM;
+ atomic_set(&(*new)->counter, 1);
+ (*new)->offset = 0;
+ }
+
+ return 0;
+}
+
+static void put_time_ns(struct time_ns *time)
+{
+ if(atomic_sub_and_test(1, &time->counter))
+ kfree(time);
+}
+
/*
* unshare allows a process to 'unshare' part of the process
* context which was originally shared using clone. copy_*
@@ -1580,6 +1599,7 @@ asmlinkage long sys_unshare(unsigned lon
struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
struct files_struct *fd, *new_fd = NULL;
struct sem_undo_list *new_ulist = NULL;
+ struct time_ns *time, *new_time = NULL;
check_unshare_flags(&unshare_flags);
@@ -1603,8 +1623,11 @@ asmlinkage long sys_unshare(unsigned lon
goto bad_unshare_cleanup_vm;
if ((err = unshare_semundo(unshare_flags, &new_ulist)))
goto bad_unshare_cleanup_fd;
+ if ((err = unshare_time(unshare_flags, &new_time)))
+ goto bad_unshare_cleanup_fd;
- if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist) {
+ if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist ||
+ new_time) {
task_lock(current);
@@ -1641,9 +1664,18 @@ asmlinkage long sys_unshare(unsigned lon
new_fd = fd;
}
+ if(new_time) {
+ time = current->time_ns;
+ current->time_ns = new_time;
+ new_time = time;
+ }
+
task_unlock(current);
}
+ if (new_time)
+ put_time_ns(new_time);
+
bad_unshare_cleanup_fd:
if (new_fd)
put_files_struct(new_fd);
-
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