X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fioprio.c;h=da3cc460d4df4d16f3afb81fea786589948a2c18;hb=eca73214c9c50e290b8dc823b41730b01788872d;hp=89e8da112a75e46cfa6aa6bef831266b07edf835;hpb=c45aa055c32b488fc3fd73c760df372b09acf69a;p=linux-2.6-omap-h63xx.git

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 89e8da112a7..da3cc460d4d 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -25,6 +25,7 @@
 #include <linux/capability.h>
 #include <linux/syscalls.h>
 #include <linux/security.h>
+#include <linux/pid_namespace.h>
 
 static int set_task_ioprio(struct task_struct *task, int ioprio)
 {
@@ -40,18 +41,28 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
 		return err;
 
 	task_lock(task);
+	do {
+		ioc = task->io_context;
+		/* see wmb() in current_io_context() */
+		smp_read_barrier_depends();
+		if (ioc)
+			break;
 
-	task->ioprio = ioprio;
-
-	ioc = task->io_context;
-	/* see wmb() in current_io_context() */
-	smp_read_barrier_depends();
+		ioc = alloc_io_context(GFP_ATOMIC, -1);
+		if (!ioc) {
+			err = -ENOMEM;
+			break;
+		}
+		task->io_context = ioc;
+	} while (1);
 
-	if (ioc)
+	if (!err) {
+		ioc->ioprio = ioprio;
 		ioc->ioprio_changed = 1;
+	}
 
 	task_unlock(task);
-	return 0;
+	return err;
 }
 
 asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
@@ -60,6 +71,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
 	int data = IOPRIO_PRIO_DATA(ioprio);
 	struct task_struct *p, *g;
 	struct user_struct *user;
+	struct pid *pgrp;
 	int ret;
 
 	switch (class) {
@@ -73,8 +85,10 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
 
 			break;
 		case IOPRIO_CLASS_IDLE:
-			if (!capable(CAP_SYS_ADMIN))
-				return -EPERM;
+			break;
+		case IOPRIO_CLASS_NONE:
+			if (data)
+				return -EINVAL;
 			break;
 		default:
 			return -EINVAL;
@@ -92,18 +106,20 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
 			if (!who)
 				p = current;
 			else
-				p = find_task_by_pid(who);
+				p = find_task_by_vpid(who);
 			if (p)
 				ret = set_task_ioprio(p, ioprio);
 			break;
 		case IOPRIO_WHO_PGRP:
 			if (!who)
-				who = process_group(current);
-			do_each_task_pid(who, PIDTYPE_PGID, p) {
+				pgrp = task_pgrp(current);
+			else
+				pgrp = find_vpid(who);
+			do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
 				ret = set_task_ioprio(p, ioprio);
 				if (ret)
 					break;
-			} while_each_task_pid(who, PIDTYPE_PGID, p);
+			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
 			break;
 		case IOPRIO_WHO_USER:
 			if (!who)
@@ -140,7 +156,9 @@ static int get_task_ioprio(struct task_struct *p)
 	ret = security_task_getioprio(p);
 	if (ret)
 		goto out;
-	ret = p->ioprio;
+	ret = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, IOPRIO_NORM);
+	if (p->io_context)
+		ret = p->io_context->ioprio;
 out:
 	return ret;
 }
@@ -167,6 +185,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
 {
 	struct task_struct *g, *p;
 	struct user_struct *user;
+	struct pid *pgrp;
 	int ret = -ESRCH;
 	int tmpio;
 
@@ -176,14 +195,16 @@ asmlinkage long sys_ioprio_get(int which, int who)
 			if (!who)
 				p = current;
 			else
-				p = find_task_by_pid(who);
+				p = find_task_by_vpid(who);
 			if (p)
 				ret = get_task_ioprio(p);
 			break;
 		case IOPRIO_WHO_PGRP:
 			if (!who)
-				who = process_group(current);
-			do_each_task_pid(who, PIDTYPE_PGID, p) {
+				pgrp = task_pgrp(current);
+			else
+				pgrp = find_vpid(who);
+			do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
 				tmpio = get_task_ioprio(p);
 				if (tmpio < 0)
 					continue;
@@ -191,7 +212,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
 					ret = tmpio;
 				else
 					ret = ioprio_best(ret, tmpio);
-			} while_each_task_pid(who, PIDTYPE_PGID, p);
+			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
 			break;
 		case IOPRIO_WHO_USER:
 			if (!who)