1 files changed, 33 insertions, 553 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index bc8879c822a..304b5410d74 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -106,537 +106,6 @@ EXPORT_SYMBOL(cad_pid);
 
 void (*pm_power_off_prepare)(void);
 
-/*
- *	Notifier list for kernel code which wants to be called
- *	at shutdown. This is used to stop any idling DMA operations
- *	and the like. 
- */
-
-static BLOCKING_NOTIFIER_HEAD(reboot_notifier_list);
-
-/*
- *	Notifier chain core routines.  The exported routines below
- *	are layered on top of these, with appropriate locking added.
- */
-
-static int notifier_chain_register(struct notifier_block **nl,
-		struct notifier_block *n)
-{
-	while ((*nl) != NULL) {
-		if (n->priority > (*nl)->priority)
-			break;
-		nl = &((*nl)->next);
-	}
-	n->next = *nl;
-	rcu_assign_pointer(*nl, n);
-	return 0;
-}
-
-static int notifier_chain_unregister(struct notifier_block **nl,
-		struct notifier_block *n)
-{
-	while ((*nl) != NULL) {
-		if ((*nl) == n) {
-			rcu_assign_pointer(*nl, n->next);
-			return 0;
-		}
-		nl = &((*nl)->next);
-	}
-	return -ENOENT;
-}
-
-/**
- * notifier_call_chain - Informs the registered notifiers about an event.
- *	@nl:		Pointer to head of the blocking notifier chain
- *	@val:		Value passed unmodified to notifier function
- *	@v:		Pointer passed unmodified to notifier function
- *	@nr_to_call:	Number of notifier functions to be called. Don't care
- *		     	value of this parameter is -1.
- *	@nr_calls:	Records the number of notifications sent. Don't care
- *		   	value of this field is NULL.
- * 	@returns:	notifier_call_chain returns the value returned by the
- *			last notifier function called.
- */
-
-static int __kprobes notifier_call_chain(struct notifier_block **nl,
-					unsigned long val, void *v,
-					int nr_to_call,	int *nr_calls)
-{
-	int ret = NOTIFY_DONE;
-	struct notifier_block *nb, *next_nb;
-
-	nb = rcu_dereference(*nl);
-
-	while (nb && nr_to_call) {
-		next_nb = rcu_dereference(nb->next);
-		ret = nb->notifier_call(nb, val, v);
-
-		if (nr_calls)
-			(*nr_calls)++;
-
-		if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK)
-			break;
-		nb = next_nb;
-		nr_to_call--;
-	}
-	return ret;
-}
-
-/*
- *	Atomic notifier chain routines.  Registration and unregistration
- *	use a spinlock, and call_chain is synchronized by RCU (no locks).
- */
-
-/**
- *	atomic_notifier_chain_register - Add notifier to an atomic notifier chain
- *	@nh: Pointer to head of the atomic notifier chain
- *	@n: New entry in notifier chain
- *
- *	Adds a notifier to an atomic notifier chain.
- *
- *	Currently always returns zero.
- */
-
-int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
-		struct notifier_block *n)
-{
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&nh->lock, flags);
-	ret = notifier_chain_register(&nh->head, n);
-	spin_unlock_irqrestore(&nh->lock, flags);
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(atomic_notifier_chain_register);
-
-/**
- *	atomic_notifier_chain_unregister - Remove notifier from an atomic notifier chain
- *	@nh: Pointer to head of the atomic notifier chain
- *	@n: Entry to remove from notifier chain
- *
- *	Removes a notifier from an atomic notifier chain.
- *
- *	Returns zero on success or %-ENOENT on failure.
- */
-int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
-		struct notifier_block *n)
-{
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&nh->lock, flags);
-	ret = notifier_chain_unregister(&nh->head, n);
-	spin_unlock_irqrestore(&nh->lock, flags);
-	synchronize_rcu();
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister);
-
-/**
- *	__atomic_notifier_call_chain - Call functions in an atomic notifier chain
- *	@nh: Pointer to head of the atomic notifier chain
- *	@val: Value passed unmodified to notifier function
- *	@v: Pointer passed unmodified to notifier function
- *	@nr_to_call: See the comment for notifier_call_chain.
- *	@nr_calls: See the comment for notifier_call_chain.
- *
- *	Calls each function in a notifier chain in turn.  The functions
- *	run in an atomic context, so they must not block.
- *	This routine uses RCU to synchronize with changes to the chain.
- *
- *	If the return value of the notifier can be and'ed
- *	with %NOTIFY_STOP_MASK then atomic_notifier_call_chain()
- *	will return immediately, with the return value of
- *	the notifier function which halted execution.
- *	Otherwise the return value is the return value
- *	of the last notifier function called.
- */
- 
-int __kprobes __atomic_notifier_call_chain(struct atomic_notifier_head *nh,
-					unsigned long val, void *v,
-					int nr_to_call, int *nr_calls)
-{
-	int ret;
-
-	rcu_read_lock();
-	ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls);
-	rcu_read_unlock();
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(__atomic_notifier_call_chain);
-
-int __kprobes atomic_notifier_call_chain(struct atomic_notifier_head *nh,
-		unsigned long val, void *v)
-{
-	return __atomic_notifier_call_chain(nh, val, v, -1, NULL);
-}
-
-EXPORT_SYMBOL_GPL(atomic_notifier_call_chain);
-/*
- *	Blocking notifier chain routines.  All access to the chain is
- *	synchronized by an rwsem.
- */
-
-/**
- *	blocking_notifier_chain_register - Add notifier to a blocking notifier chain
- *	@nh: Pointer to head of the blocking notifier chain
- *	@n: New entry in notifier chain
- *
- *	Adds a notifier to a blocking notifier chain.
- *	Must be called in process context.
- *
- *	Currently always returns zero.
- */
- 
-int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
-		struct notifier_block *n)
-{
-	int ret;
-
-	/*
-	 * This code gets used during boot-up, when task switching is
-	 * not yet working and interrupts must remain disabled.  At
-	 * such times we must not call down_write().
-	 */
-	if (unlikely(system_state == SYSTEM_BOOTING))
-		return notifier_chain_register(&nh->head, n);
-
-	down_write(&nh->rwsem);
-	ret = notifier_chain_register(&nh->head, n);
-	up_write(&nh->rwsem);
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(blocking_notifier_chain_register);
-
-/**
- *	blocking_notifier_chain_unregister - Remove notifier from a blocking notifier chain
- *	@nh: Pointer to head of the blocking notifier chain
- *	@n: Entry to remove from notifier chain
- *
- *	Removes a notifier from a blocking notifier chain.
- *	Must be called from process context.
- *
- *	Returns zero on success or %-ENOENT on failure.
- */
-int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
-		struct notifier_block *n)
-{
-	int ret;
-
-	/*
-	 * This code gets used during boot-up, when task switching is
-	 * not yet working and interrupts must remain disabled.  At
-	 * such times we must not call down_write().
-	 */
-	if (unlikely(system_state == SYSTEM_BOOTING))
-		return notifier_chain_unregister(&nh->head, n);
-
-	down_write(&nh->rwsem);
-	ret = notifier_chain_unregister(&nh->head, n);
-	up_write(&nh->rwsem);
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(blocking_notifier_chain_unregister);
-
-/**
- *	__blocking_notifier_call_chain - Call functions in a blocking notifier chain
- *	@nh: Pointer to head of the blocking notifier chain
- *	@val: Value passed unmodified to notifier function
- *	@v: Pointer passed unmodified to notifier function
- *	@nr_to_call: See comment for notifier_call_chain.
- *	@nr_calls: See comment for notifier_call_chain.
- *
- *	Calls each function in a notifier chain in turn.  The functions
- *	run in a process context, so they are allowed to block.
- *
- *	If the return value of the notifier can be and'ed
- *	with %NOTIFY_STOP_MASK then blocking_notifier_call_chain()
- *	will return immediately, with the return value of
- *	the notifier function which halted execution.
- *	Otherwise the return value is the return value
- *	of the last notifier function called.
- */
- 
-int __blocking_notifier_call_chain(struct blocking_notifier_head *nh,
-				   unsigned long val, void *v,
-				   int nr_to_call, int *nr_calls)
-{
-	int ret = NOTIFY_DONE;
-
-	/*
-	 * We check the head outside the lock, but if this access is
-	 * racy then it does not matter what the result of the test
-	 * is, we re-check the list after having taken the lock anyway:
-	 */
-	if (rcu_dereference(nh->head)) {
-		down_read(&nh->rwsem);
-		ret = notifier_call_chain(&nh->head, val, v, nr_to_call,
-					nr_calls);
-		up_read(&nh->rwsem);
-	}
-	return ret;
-}
-EXPORT_SYMBOL_GPL(__blocking_notifier_call_chain);
-
-int blocking_notifier_call_chain(struct blocking_notifier_head *nh,
-		unsigned long val, void *v)
-{
-	return __blocking_notifier_call_chain(nh, val, v, -1, NULL);
-}
-EXPORT_SYMBOL_GPL(blocking_notifier_call_chain);
-
-/*
- *	Raw notifier chain routines.  There is no protection;
- *	the caller must provide it.  Use at your own risk!
- */
-
-/**
- *	raw_notifier_chain_register - Add notifier to a raw notifier chain
- *	@nh: Pointer to head of the raw notifier chain
- *	@n: New entry in notifier chain
- *
- *	Adds a notifier to a raw notifier chain.
- *	All locking must be provided by the caller.
- *
- *	Currently always returns zero.
- */
-
-int raw_notifier_chain_register(struct raw_notifier_head *nh,
-		struct notifier_block *n)
-{
-	return notifier_chain_register(&nh->head, n);
-}
-
-EXPORT_SYMBOL_GPL(raw_notifier_chain_register);
-
-/**
- *	raw_notifier_chain_unregister - Remove notifier from a raw notifier chain
- *	@nh: Pointer to head of the raw notifier chain
- *	@n: Entry to remove from notifier chain
- *
- *	Removes a notifier from a raw notifier chain.
- *	All locking must be provided by the caller.
- *
- *	Returns zero on success or %-ENOENT on failure.
- */
-int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
-		struct notifier_block *n)
-{
-	return notifier_chain_unregister(&nh->head, n);
-}
-
-EXPORT_SYMBOL_GPL(raw_notifier_chain_unregister);
-
-/**
- *	__raw_notifier_call_chain - Call functions in a raw notifier chain
- *	@nh: Pointer to head of the raw notifier chain
- *	@val: Value passed unmodified to notifier function
- *	@v: Pointer passed unmodified to notifier function
- *	@nr_to_call: See comment for notifier_call_chain.
- *	@nr_calls: See comment for notifier_call_chain
- *
- *	Calls each function in a notifier chain in turn.  The functions
- *	run in an undefined context.
- *	All locking must be provided by the caller.
- *
- *	If the return value of the notifier can be and'ed
- *	with %NOTIFY_STOP_MASK then raw_notifier_call_chain()
- *	will return immediately, with the return value of
- *	the notifier function which halted execution.
- *	Otherwise the return value is the return value
- *	of the last notifier function called.
- */
-
-int __raw_notifier_call_chain(struct raw_notifier_head *nh,
-			      unsigned long val, void *v,
-			      int nr_to_call, int *nr_calls)
-{
-	return notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls);
-}
-
-EXPORT_SYMBOL_GPL(__raw_notifier_call_chain);
-
-int raw_notifier_call_chain(struct raw_notifier_head *nh,
-		unsigned long val, void *v)
-{
-	return __raw_notifier_call_chain(nh, val, v, -1, NULL);
-}
-
-EXPORT_SYMBOL_GPL(raw_notifier_call_chain);
-
-/*
- *	SRCU notifier chain routines.    Registration and unregistration
- *	use a mutex, and call_chain is synchronized by SRCU (no locks).
- */
-
-/**
- *	srcu_notifier_chain_register - Add notifier to an SRCU notifier chain
- *	@nh: Pointer to head of the SRCU notifier chain
- *	@n: New entry in notifier chain
- *
- *	Adds a notifier to an SRCU notifier chain.
- *	Must be called in process context.
- *
- *	Currently always returns zero.
- */
-
-int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
-		struct notifier_block *n)
-{
-	int ret;
-
-	/*
-	 * This code gets used during boot-up, when task switching is
-	 * not yet working and interrupts must remain disabled.  At
-	 * such times we must not call mutex_lock().
-	 */
-	if (unlikely(system_state == SYSTEM_BOOTING))
-		return notifier_chain_register(&nh->head, n);
-
-	mutex_lock(&nh->mutex);
-	ret = notifier_chain_register(&nh->head, n);
-	mutex_unlock(&nh->mutex);
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(srcu_notifier_chain_register);
-
-/**
- *	srcu_notifier_chain_unregister - Remove notifier from an SRCU notifier chain
- *	@nh: Pointer to head of the SRCU notifier chain
- *	@n: Entry to remove from notifier chain
- *
- *	Removes a notifier from an SRCU notifier chain.
- *	Must be called from process context.
- *
- *	Returns zero on success or %-ENOENT on failure.
- */
-int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
-		struct notifier_block *n)
-{
-	int ret;
-
-	/*
-	 * This code gets used during boot-up, when task switching is
-	 * not yet working and interrupts must remain disabled.  At
-	 * such times we must not call mutex_lock().
-	 */
-	if (unlikely(system_state == SYSTEM_BOOTING))
-		return notifier_chain_unregister(&nh->head, n);
-
-	mutex_lock(&nh->mutex);
-	ret = notifier_chain_unregister(&nh->head, n);
-	mutex_unlock(&nh->mutex);
-	synchronize_srcu(&nh->srcu);
-	return ret;
-}
-
-EXPORT_SYMBOL_GPL(srcu_notifier_chain_unregister);
-
-/**
- *	__srcu_notifier_call_chain - Call functions in an SRCU notifier chain
- *	@nh: Pointer to head of the SRCU notifier chain
- *	@val: Value passed unmodified to notifier function
- *	@v: Pointer passed unmodified to notifier function
- *	@nr_to_call: See comment for notifier_call_chain.
- *	@nr_calls: See comment for notifier_call_chain
- *
- *	Calls each function in a notifier chain in turn.  The functions
- *	run in a process context, so they are allowed to block.
- *
- *	If the return value of the notifier can be and'ed
- *	with %NOTIFY_STOP_MASK then srcu_notifier_call_chain()
- *	will return immediately, with the return value of
- *	the notifier function which halted execution.
- *	Otherwise the return value is the return value
- *	of the last notifier function called.
- */
-
-int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
-			       unsigned long val, void *v,
-			       int nr_to_call, int *nr_calls)
-{
-	int ret;
-	int idx;
-
-	idx = srcu_read_lock(&nh->srcu);
-	ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls);
-	srcu_read_unlock(&nh->srcu, idx);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(__srcu_notifier_call_chain);
-
-int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
-		unsigned long val, void *v)
-{
-	return __srcu_notifier_call_chain(nh, val, v, -1, NULL);
-}
-EXPORT_SYMBOL_GPL(srcu_notifier_call_chain);
-
-/**
- *	srcu_init_notifier_head - Initialize an SRCU notifier head
- *	@nh: Pointer to head of the srcu notifier chain
- *
- *	Unlike other sorts of notifier heads, SRCU notifier heads require
- *	dynamic initialization.  Be sure to call this routine before
- *	calling any of the other SRCU notifier routines for this head.
- *
- *	If an SRCU notifier head is deallocated, it must first be cleaned
- *	up by calling srcu_cleanup_notifier_head().  Otherwise the head's
- *	per-cpu data (used by the SRCU mechanism) will leak.
- */
-
-void srcu_init_notifier_head(struct srcu_notifier_head *nh)
-{
-	mutex_init(&nh->mutex);
-	if (init_srcu_struct(&nh->srcu) < 0)
-		BUG();
-	nh->head = NULL;
-}
-
-EXPORT_SYMBOL_GPL(srcu_init_notifier_head);
-
-/**
- *	register_reboot_notifier - Register function to be called at reboot time
- *	@nb: Info about notifier function to be called
- *
- *	Registers a function with the list of functions
- *	to be called at reboot time.
- *
- *	Currently always returns zero, as blocking_notifier_chain_register()
- *	always returns zero.
- */
- 
-int register_reboot_notifier(struct notifier_block * nb)
-{
-	return blocking_notifier_chain_register(&reboot_notifier_list, nb);
-}
-
-EXPORT_SYMBOL(register_reboot_notifier);
-
-/**
- *	unregister_reboot_notifier - Unregister previously registered reboot notifier
- *	@nb: Hook to be unregistered
- *
- *	Unregisters a previously registered reboot
- *	notifier function.
- *
- *	Returns zero on success, or %-ENOENT on failure.
- */
- 
-int unregister_reboot_notifier(struct notifier_block * nb)
-{
-	return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
-}
-
-EXPORT_SYMBOL(unregister_reboot_notifier);
-
 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {
 	int no_nice;
@@ -683,7 +152,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
 	switch (which) {
 		case PRIO_PROCESS:
 			if (who)
-				p = find_task_by_pid(who);
+				p = find_task_by_vpid(who);
 			else
 				p = current;
 			if (p)
@@ -691,7 +160,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
 			break;
 		case PRIO_PGRP:
 			if (who)
-				pgrp = find_pid(who);
+				pgrp = find_vpid(who);
 			else
 				pgrp = task_pgrp(current);
 			do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
@@ -740,7 +209,7 @@ asmlinkage long sys_getpriority(int which, int who)
 	switch (which) {
 		case PRIO_PROCESS:
 			if (who)
-				p = find_task_by_pid(who);
+				p = find_task_by_vpid(who);
 			else
 				p = current;
 			if (p) {
@@ -751,7 +220,7 @@ asmlinkage long sys_getpriority(int which, int who)
 			break;
 		case PRIO_PGRP:
 			if (who)
-				pgrp = find_pid(who);
+				pgrp = find_vpid(who);
 			else
 				pgrp = task_pgrp(current);
 			do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
@@ -1448,9 +917,10 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	struct task_struct *p;
 	struct task_struct *group_leader = current->group_leader;
 	int err = -EINVAL;
+	struct pid_namespace *ns;
 
 	if (!pid)
-		pid = group_leader->pid;
+		pid = task_pid_vnr(group_leader);
 	if (!pgid)
 		pgid = pid;
 	if (pgid < 0)
@@ -1459,10 +929,12 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	/* From this point forward we keep holding onto the tasklist lock
 	 * so that our parent does not change from under us. -DaveM
 	 */
+	ns = current->nsproxy->pid_ns;
+
 	write_lock_irq(&tasklist_lock);
 
 	err = -ESRCH;
-	p = find_task_by_pid(pid);
+	p = find_task_by_pid_ns(pid, ns);
 	if (!p)
 		goto out;
 
@@ -1488,9 +960,9 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 		goto out;
 
 	if (pgid != pid) {
-		struct task_struct *g =
-			find_task_by_pid_type(PIDTYPE_PGID, pgid);
+		struct task_struct *g;
 
+		g = find_task_by_pid_type_ns(PIDTYPE_PGID, pgid, ns);
 		if (!g || task_session(g) != task_session(group_leader))
 			goto out;
 	}
@@ -1499,10 +971,13 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	if (err)
 		goto out;
 
-	if (process_group(p) != pgid) {
+	if (task_pgrp_nr_ns(p, ns) != pgid) {
+		struct pid *pid;
+
 		detach_pid(p, PIDTYPE_PGID);
-		p->signal->pgrp = pgid;
-		attach_pid(p, PIDTYPE_PGID, find_pid(pgid));
+		pid = find_vpid(pgid);
+		attach_pid(p, PIDTYPE_PGID, pid);
+		set_task_pgrp(p, pid_nr(pid));
 	}
 
 	err = 0;
@@ -1515,19 +990,21 @@ out:
 asmlinkage long sys_getpgid(pid_t pid)
 {
 	if (!pid)
-		return process_group(current);
+		return task_pgrp_vnr(current);
 	else {
 		int retval;
 		struct task_struct *p;
+		struct pid_namespace *ns;
 
-		read_lock(&tasklist_lock);
-		p = find_task_by_pid(pid);
+		ns = current->nsproxy->pid_ns;
 
+		read_lock(&tasklist_lock);
+		p = find_task_by_pid_ns(pid, ns);
 		retval = -ESRCH;
 		if (p) {
 			retval = security_task_getpgid(p);
 			if (!retval)
-				retval = process_group(p);
+				retval = task_pgrp_nr_ns(p, ns);
 		}
 		read_unlock(&tasklist_lock);
 		return retval;
@@ -1539,7 +1016,7 @@ asmlinkage long sys_getpgid(pid_t pid)
 asmlinkage long sys_getpgrp(void)
 {
 	/* SMP - assuming writes are word atomic this is fine */
-	return process_group(current);
+	return task_pgrp_vnr(current);
 }
 
 #endif
@@ -1547,19 +1024,21 @@ asmlinkage long sys_getpgrp(void)
 asmlinkage long sys_getsid(pid_t pid)
 {
 	if (!pid)
-		return process_session(current);
+		return task_session_vnr(current);
 	else {
 		int retval;
 		struct task_struct *p;
+		struct pid_namespace *ns;
 
-		read_lock(&tasklist_lock);
-		p = find_task_by_pid(pid);
+		ns = current->nsproxy->pid_ns;
 
+		read_lock(&tasklist_lock);
+		p = find_task_by_pid_ns(pid, ns);
 		retval = -ESRCH;
 		if (p) {
 			retval = security_task_getsid(p);
 			if (!retval)
-				retval = process_session(p);
+				retval = task_session_nr_ns(p, ns);
 		}
 		read_unlock(&tasklist_lock);
 		return retval;
@@ -1586,7 +1065,8 @@ asmlinkage long sys_setsid(void)
 	 * session id and so the check will always fail and make it so
 	 * init cannot successfully call setsid.
 	 */
-	if (session > 1 && find_task_by_pid_type(PIDTYPE_PGID, session))
+	if (session > 1 && find_task_by_pid_type_ns(PIDTYPE_PGID,
+				session, &init_pid_ns))
 		goto out;
 
 	group_leader->signal->leader = 1;
@@ -1596,7 +1076,7 @@ asmlinkage long sys_setsid(void)
 	group_leader->signal->tty = NULL;
 	spin_unlock(&group_leader->sighand->siglock);
 
-	err = process_group(group_leader);
+	err = task_pgrp_vnr(group_leader);
 out:
 	write_unlock_irq(&tasklist_lock);
 	return err;