affs-convert-from-semaphore-to-mutex.patch

From fa0fac3c986a7a3f0f2b5beb4da163a6a16c8bc8 Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Sun, 16 Jan 2011 20:07:06 -0500
Subject: [PATCH] affs: convert from semaphore to mutex

This is one of several extractions from the merge up to 33-rc8.

You can find the origin of this change in the tip merge commit:

     commit 5f854cfc024622e4aae14d7cf422f6ff86278688
     Merge: cc24da0 4ec62b2
     Author: Thomas Gleixner <tglx@linutronix.de>
     Date:   Sun Feb 21 20:17:22 2010 +0100

         Forward to 2.6.33-rc8

         Merge branch 'linus' into rt/head with a pile of conflicts.

         Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Normally there are not significant changes/additions in a merge commit that
are not from any other "normal" commit.  But in this case there are, so
break them out into separate explicit commits.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index 0e40caa..e76128a 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -50,9 +50,8 @@ struct affs_ext_key {
  */
 struct affs_inode_info {
 	atomic_t i_opencnt;
-	struct semaphore i_link_lock;		/* Protects internal inode access. */
-	struct semaphore i_ext_lock;		/* Protects internal inode access. */
-#define i_hash_lock i_ext_lock
+	struct mutex i_link_lock;		/* Protects internal inode access. */
+	struct mutex i_ext_lock;		/* Protects internal inode access. */
 	u32	 i_blkcnt;			/* block count */
 	u32	 i_extcnt;			/* extended block count */
 	u32	*i_lc;				/* linear cache of extended blocks */
@@ -275,30 +274,23 @@ affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 static inline void
 affs_lock_link(struct inode *inode)
 {
-	down(&AFFS_I(inode)->i_link_lock);
+	mutex_lock(&AFFS_I(inode)->i_link_lock);
 }
 static inline void
 affs_unlock_link(struct inode *inode)
 {
-	up(&AFFS_I(inode)->i_link_lock);
-}
-static inline void
-affs_lock_dir(struct inode *inode)
-{
-	down(&AFFS_I(inode)->i_hash_lock);
-}
-static inline void
-affs_unlock_dir(struct inode *inode)
-{
-	up(&AFFS_I(inode)->i_hash_lock);
+	mutex_unlock(&AFFS_I(inode)->i_link_lock);
 }
 static inline void
 affs_lock_ext(struct inode *inode)
 {
-	down(&AFFS_I(inode)->i_ext_lock);
+	mutex_lock(&AFFS_I(inode)->i_ext_lock);
 }
 static inline void
 affs_unlock_ext(struct inode *inode)
 {
-	up(&AFFS_I(inode)->i_ext_lock);
+	mutex_unlock(&AFFS_I(inode)->i_ext_lock);
 }
+
+#define affs_lock_dir(i)	affs_lock_ext(i)
+#define affs_unlock_dir(i)	affs_unlock_ext(i)
diff --git a/fs/affs/super.c b/fs/affs/super.c
index b3b1a86..f010759 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -113,8 +113,8 @@ static void init_once(void *foo)
 {
 	struct affs_inode_info *ei = (struct affs_inode_info *) foo;
 
-	semaphore_init(&ei->i_link_lock);
-	semaphore_init(&ei->i_ext_lock);
+	mutex_init(&ei->i_link_lock);
+	mutex_init(&ei->i_ext_lock);
 	inode_init_once(&ei->vfs_inode);
 }
 
-- 
1.7.1.1