From 7cf34c761db8827818a27e23c50756f8b821a9b0 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 23 Mar 2006 03:00:36 -0800
Subject: [PATCH] [PATCH] sem2mutex: fs/libfs.c

Semaphore to mutex conversion.

The conversion was generated via scripts, and the result was validated
automatically via a script as well.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/libfs.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/libfs.c b/fs/libfs.c
index 71fd08fa4103..4fdeaceb892c 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -7,6 +7,8 @@
 #include <linux/pagemap.h>
 #include <linux/mount.h>
 #include <linux/vfs.h>
+#include <linux/mutex.h>
+
 #include <asm/uaccess.h>
 
 int simple_getattr(struct vfsmount *mnt, struct dentry *dentry,
@@ -530,7 +532,7 @@ struct simple_attr {
 	char set_buf[24];
 	void *data;
 	const char *fmt;	/* format for read operation */
-	struct semaphore sem;	/* protects access to these buffers */
+	struct mutex mutex;	/* protects access to these buffers */
 };
 
 /* simple_attr_open is called by an actual attribute open file operation
@@ -549,7 +551,7 @@ int simple_attr_open(struct inode *inode, struct file *file,
 	attr->set = set;
 	attr->data = inode->u.generic_ip;
 	attr->fmt = fmt;
-	init_MUTEX(&attr->sem);
+	mutex_init(&attr->mutex);
 
 	file->private_data = attr;
 
@@ -575,7 +577,7 @@ ssize_t simple_attr_read(struct file *file, char __user *buf,
 	if (!attr->get)
 		return -EACCES;
 
-	down(&attr->sem);
+	mutex_lock(&attr->mutex);
 	if (*ppos) /* continued read */
 		size = strlen(attr->get_buf);
 	else	  /* first read */
@@ -584,7 +586,7 @@ ssize_t simple_attr_read(struct file *file, char __user *buf,
 				 (unsigned long long)attr->get(attr->data));
 
 	ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size);
-	up(&attr->sem);
+	mutex_unlock(&attr->mutex);
 	return ret;
 }
 
@@ -602,7 +604,7 @@ ssize_t simple_attr_write(struct file *file, const char __user *buf,
 	if (!attr->set)
 		return -EACCES;
 
-	down(&attr->sem);
+	mutex_lock(&attr->mutex);
 	ret = -EFAULT;
 	size = min(sizeof(attr->set_buf) - 1, len);
 	if (copy_from_user(attr->set_buf, buf, size))
@@ -613,7 +615,7 @@ ssize_t simple_attr_write(struct file *file, const char __user *buf,
 	val = simple_strtol(attr->set_buf, NULL, 0);
 	attr->set(attr->data, val);
 out:
-	up(&attr->sem);
+	mutex_unlock(&attr->mutex);
 	return ret;
 }