X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Feventfd.c;h=08bf558d04080ffe0a3ced77a5660d4af4e1182f;hb=19b9bdb054895ba07086f0264641c9f80e0eb2c4;hp=480e2b3c4166a85be538d6f2c5edc25eace5ec6f;hpb=e1ad7468c77ddb94b0615d5f50fa255525fde0f0;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/eventfd.c b/fs/eventfd.c
index 480e2b3..08bf558 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -15,9 +15,9 @@
 #include <linux/spinlock.h>
 #include <linux/anon_inodes.h>
 #include <linux/eventfd.h>
+#include <linux/syscalls.h>
 
 struct eventfd_ctx {
-	spinlock_t lock;
 	wait_queue_head_t wqh;
 	/*
 	 * Every time that a write(2) is performed on an eventfd, the
@@ -45,13 +45,13 @@ int eventfd_signal(struct file *file, int n)
 
 	if (n < 0)
 		return -EINVAL;
-	spin_lock_irqsave(&ctx->lock, flags);
+	spin_lock_irqsave(&ctx->wqh.lock, flags);
 	if (ULLONG_MAX - ctx->count < n)
 		n = (int) (ULLONG_MAX - ctx->count);
 	ctx->count += n;
 	if (waitqueue_active(&ctx->wqh))
 		wake_up_locked(&ctx->wqh);
-	spin_unlock_irqrestore(&ctx->lock, flags);
+	spin_unlock_irqrestore(&ctx->wqh.lock, flags);
 
 	return n;
 }
@@ -70,14 +70,14 @@ static unsigned int eventfd_poll(struct file *file, poll_table *wait)
 
 	poll_wait(file, &ctx->wqh, wait);
 
-	spin_lock_irqsave(&ctx->lock, flags);
+	spin_lock_irqsave(&ctx->wqh.lock, flags);
 	if (ctx->count > 0)
 		events |= POLLIN;
 	if (ctx->count == ULLONG_MAX)
 		events |= POLLERR;
 	if (ULLONG_MAX - 1 > ctx->count)
 		events |= POLLOUT;
-	spin_unlock_irqrestore(&ctx->lock, flags);
+	spin_unlock_irqrestore(&ctx->wqh.lock, flags);
 
 	return events;
 }
@@ -92,7 +92,7 @@ static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
 
 	if (count < sizeof(ucnt))
 		return -EINVAL;
-	spin_lock_irq(&ctx->lock);
+	spin_lock_irq(&ctx->wqh.lock);
 	res = -EAGAIN;
 	ucnt = ctx->count;
 	if (ucnt > 0)
@@ -110,9 +110,9 @@ static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
 				res = -ERESTARTSYS;
 				break;
 			}
-			spin_unlock_irq(&ctx->lock);
+			spin_unlock_irq(&ctx->wqh.lock);
 			schedule();
-			spin_lock_irq(&ctx->lock);
+			spin_lock_irq(&ctx->wqh.lock);
 		}
 		__remove_wait_queue(&ctx->wqh, &wait);
 		__set_current_state(TASK_RUNNING);
@@ -122,7 +122,7 @@ static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
 		if (waitqueue_active(&ctx->wqh))
 			wake_up_locked(&ctx->wqh);
 	}
-	spin_unlock_irq(&ctx->lock);
+	spin_unlock_irq(&ctx->wqh.lock);
 	if (res > 0 && put_user(ucnt, (__u64 __user *) buf))
 		return -EFAULT;
 
@@ -143,7 +143,7 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
 		return -EFAULT;
 	if (ucnt == ULLONG_MAX)
 		return -EINVAL;
-	spin_lock_irq(&ctx->lock);
+	spin_lock_irq(&ctx->wqh.lock);
 	res = -EAGAIN;
 	if (ULLONG_MAX - ctx->count > ucnt)
 		res = sizeof(ucnt);
@@ -159,9 +159,9 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
 				res = -ERESTARTSYS;
 				break;
 			}
-			spin_unlock_irq(&ctx->lock);
+			spin_unlock_irq(&ctx->wqh.lock);
 			schedule();
-			spin_lock_irq(&ctx->lock);
+			spin_lock_irq(&ctx->wqh.lock);
 		}
 		__remove_wait_queue(&ctx->wqh, &wait);
 		__set_current_state(TASK_RUNNING);
@@ -171,7 +171,7 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
 		if (waitqueue_active(&ctx->wqh))
 			wake_up_locked(&ctx->wqh);
 	}
-	spin_unlock_irq(&ctx->lock);
+	spin_unlock_irq(&ctx->wqh.lock);
 
 	return res;
 }
@@ -198,31 +198,38 @@ struct file *eventfd_fget(int fd)
 	return file;
 }
 
-asmlinkage long sys_eventfd(unsigned int count)
+asmlinkage long sys_eventfd2(unsigned int count, int flags)
 {
-	int error, fd;
+	int fd;
 	struct eventfd_ctx *ctx;
-	struct file *file;
-	struct inode *inode;
+
+	/* Check the EFD_* constants for consistency.  */
+	BUILD_BUG_ON(EFD_CLOEXEC != O_CLOEXEC);
+	BUILD_BUG_ON(EFD_NONBLOCK != O_NONBLOCK);
+
+	if (flags & ~(EFD_CLOEXEC | EFD_NONBLOCK))
+		return -EINVAL;
 
 	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
 
 	init_waitqueue_head(&ctx->wqh);
-	spin_lock_init(&ctx->lock);
 	ctx->count = count;
 
 	/*
 	 * When we call this, the initialization must be complete, since
 	 * anon_inode_getfd() will install the fd.
 	 */
-	error = anon_inode_getfd(&fd, &inode, &file, "[eventfd]",
-				 &eventfd_fops, ctx);
-	if (!error)
-		return fd;
+	fd = anon_inode_getfd("[eventfd]", &eventfd_fops, ctx,
+			      flags & (O_CLOEXEC | O_NONBLOCK));
+	if (fd < 0)
+		kfree(ctx);
+	return fd;
+}
 
-	kfree(ctx);
-	return error;
+asmlinkage long sys_eventfd(unsigned int count)
+{
+	return sys_eventfd2(count, 0);
 }