X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=kernel%2Fpid.c;h=83008f812f4974031178f804d847e55c083ad21e;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=23706b226f3ad8149984328b95fe73f3742089ea;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git

diff --git a/kernel/pid.c b/kernel/pid.c
index 23706b226..83008f812 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -25,10 +25,9 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/hash.h>
-#include <linux/vs_cvirt.h>
 
 #define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift)
-static struct list_head *pid_hash[PIDTYPE_MAX];
+static struct hlist_head *pid_hash[PIDTYPE_MAX];
 static int pidhash_shift;
 
 int pid_max = PID_MAX_DEFAULT;
@@ -147,73 +146,66 @@ failure:
 	return -1;
 }
 
-fastcall struct pid *find_pid(enum pid_type type, int nr)
+struct pid * fastcall find_pid(enum pid_type type, int nr)
 {
-	struct list_head *elem, *bucket = &pid_hash[type][pid_hashfn(nr)];
+	struct hlist_node *elem;
 	struct pid *pid;
 
-	__list_for_each(elem, bucket) {
-		pid = list_entry(elem, struct pid, hash_chain);
+	hlist_for_each_entry(pid, elem,
+			&pid_hash[type][pid_hashfn(nr)], pid_chain) {
 		if (pid->nr == nr)
 			return pid;
 	}
 	return NULL;
 }
 
-void fastcall link_pid(task_t *task, struct pid_link *link, struct pid *pid)
-{
-	atomic_inc(&pid->count);
-	list_add_tail(&link->pid_chain, &pid->task_list);
-	link->pidptr = pid;
-}
-
 int fastcall attach_pid(task_t *task, enum pid_type type, int nr)
 {
-	struct pid *pid = find_pid(type, nr);
-
-	if (pid)
-		atomic_inc(&pid->count);
-	else {
-		pid = &task->pids[type].pid;
-		pid->nr = nr;
-		atomic_set(&pid->count, 1);
-		INIT_LIST_HEAD(&pid->task_list);
-		pid->task = task;
-		get_task_struct(task);
-		list_add(&pid->hash_chain, &pid_hash[type][pid_hashfn(nr)]);
+	struct pid *pid, *task_pid;
+
+	task_pid = &task->pids[type];
+	pid = find_pid(type, nr);
+	if (pid == NULL) {
+		hlist_add_head(&task_pid->pid_chain,
+				&pid_hash[type][pid_hashfn(nr)]);
+		INIT_LIST_HEAD(&task_pid->pid_list);
+	} else {
+		INIT_HLIST_NODE(&task_pid->pid_chain);
+		list_add_tail(&task_pid->pid_list, &pid->pid_list);
 	}
-	list_add_tail(&task->pids[type].pid_chain, &pid->task_list);
-	task->pids[type].pidptr = pid;
+	task_pid->nr = nr;
 
 	return 0;
 }
 
 static inline int __detach_pid(task_t *task, enum pid_type type)
 {
-	struct pid_link *link = task->pids + type;
-	struct pid *pid = link->pidptr;
+	struct pid *pid, *pid_next;
 	int nr;
 
-	list_del(&link->pid_chain);
-	if (!atomic_dec_and_test(&pid->count))
-		return 0;
-
+	pid = &task->pids[type];
+	if (!hlist_unhashed(&pid->pid_chain)) {
+		hlist_del(&pid->pid_chain);
+		if (!list_empty(&pid->pid_list)) {
+			pid_next = list_entry(pid->pid_list.next,
+						struct pid, pid_list);
+			/* insert next pid from pid_list to hash */
+			hlist_add_head(&pid_next->pid_chain,
+				&pid_hash[type][pid_hashfn(pid_next->nr)]);
+		}
+	}
+	list_del(&pid->pid_list);
 	nr = pid->nr;
-	list_del(&pid->hash_chain);
-	put_task_struct(pid->task);
+	pid->nr = 0;
 
 	return nr;
 }
 
-static void _detach_pid(task_t *task, enum pid_type type)
-{
-	__detach_pid(task, type);
-}
-
 void fastcall detach_pid(task_t *task, enum pid_type type)
 {
-	int nr = __detach_pid(task, type);
+	int nr;
 
+	nr = __detach_pid(task, type);
 	if (!nr)
 		return;
 
@@ -223,17 +215,18 @@ void fastcall detach_pid(task_t *task, enum pid_type type)
 	free_pidmap(nr);
 }
 
-task_t *find_task_by_pid(int nr)
+task_t *find_task_by_pid_type(int type, int nr)
 {
-	struct pid *pid = find_pid(PIDTYPE_PID,
-		vx_rmap_tgid(current->vx_info, nr));
+	struct pid *pid;
 
+	pid = find_pid(type, nr);
 	if (!pid)
 		return NULL;
-	return pid_task(pid->task_list.next, PIDTYPE_PID);
+
+	return pid_task(&pid->pid_list, type);
 }
 
-EXPORT_SYMBOL(find_task_by_pid);
+EXPORT_SYMBOL(find_task_by_pid_type);
 
 /*
  * This function switches the PIDs if a non-leader thread calls
@@ -242,13 +235,13 @@ EXPORT_SYMBOL(find_task_by_pid);
  */
 void switch_exec_pids(task_t *leader, task_t *thread)
 {
-	_detach_pid(leader, PIDTYPE_PID);
-	_detach_pid(leader, PIDTYPE_TGID);
-	_detach_pid(leader, PIDTYPE_PGID);
-	_detach_pid(leader, PIDTYPE_SID);
+	__detach_pid(leader, PIDTYPE_PID);
+	__detach_pid(leader, PIDTYPE_TGID);
+	__detach_pid(leader, PIDTYPE_PGID);
+	__detach_pid(leader, PIDTYPE_SID);
 
-	_detach_pid(thread, PIDTYPE_PID);
-	_detach_pid(thread, PIDTYPE_TGID);
+	__detach_pid(thread, PIDTYPE_PID);
+	__detach_pid(thread, PIDTYPE_TGID);
 
 	leader->pid = leader->tgid = thread->pid;
 	thread->pid = thread->tgid;
@@ -273,23 +266,23 @@ void switch_exec_pids(task_t *leader, task_t *thread)
 void __init pidhash_init(void)
 {
 	int i, j, pidhash_size;
-	unsigned long megabytes = max_pfn >> (20 - PAGE_SHIFT);
+	unsigned long megabytes = nr_kernel_pages >> (20 - PAGE_SHIFT);
 
 	pidhash_shift = max(4, fls(megabytes * 4));
 	pidhash_shift = min(12, pidhash_shift);
 	pidhash_size = 1 << pidhash_shift;
 
-	printk("PID hash table entries: %d (order %d: %Zd bytes)\n",
+	printk("PID hash table entries: %d (order: %d, %Zd bytes)\n",
 		pidhash_size, pidhash_shift,
-		pidhash_size * sizeof(struct list_head));
+		PIDTYPE_MAX * pidhash_size * sizeof(struct hlist_head));
 
 	for (i = 0; i < PIDTYPE_MAX; i++) {
 		pid_hash[i] = alloc_bootmem(pidhash_size *
-					sizeof(struct list_head));
+					sizeof(*(pid_hash[i])));
 		if (!pid_hash[i])
 			panic("Could not alloc pidhash!\n");
 		for (j = 0; j < pidhash_size; j++)
-			INIT_LIST_HEAD(&pid_hash[i][j]);
+			INIT_HLIST_HEAD(&pid_hash[i][j]);
 	}
 }