linux-kernel - Re: [patch 1/2] HFS: Convert bitmap

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Date:	Sun, 11 May 2008 20:15:30 +0200
From:	Matthias Kaehlcke <matthias@...hlcke.net>
To:	zippel@...ux-m68k.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [patch 1/2] HFS: Convert bitmap_lock in a mutex

Apple Macintosh file system: The semaphore bitmap_lock is used as a mutex. 
Convert it to the mutex API

Signed-off-by: Matthias Kaehlcke <matthias@...hlcke.net>

--

Index: linux-2.6/fs/hfs/bitmap.c
===================================================================
--- linux-2.6.orig/fs/hfs/bitmap.c	2008-05-11 20:10:11.000000000 +0200
+++ linux-2.6/fs/hfs/bitmap.c	2008-05-11 20:10:18.000000000 +0200
@@ -145,7 +145,7 @@
 	if (!*num_bits)
 		return 0;
 
-	down(&HFS_SB(sb)->bitmap_lock);
+	mutex_lock(&HFS_SB(sb)->bitmap_lock);
 	bitmap = HFS_SB(sb)->bitmap;
 
 	pos = hfs_find_set_zero_bits(bitmap, HFS_SB(sb)->fs_ablocks, goal, num_bits);
@@ -162,7 +162,7 @@
 	HFS_SB(sb)->free_ablocks -= *num_bits;
 	hfs_bitmap_dirty(sb);
 out:
-	up(&HFS_SB(sb)->bitmap_lock);
+	mutex_unlock(&HFS_SB(sb)->bitmap_lock);
 	return pos;
 }
 
@@ -205,7 +205,7 @@
 	if ((start + count) > HFS_SB(sb)->fs_ablocks)
 		return -2;
 
-	down(&HFS_SB(sb)->bitmap_lock);
+	mutex_lock(&HFS_SB(sb)->bitmap_lock);
 	/* bitmap is always on a 32-bit boundary */
 	curr = HFS_SB(sb)->bitmap + (start / 32);
 	len = count;
@@ -236,7 +236,7 @@
 	}
 out:
 	HFS_SB(sb)->free_ablocks += len;
-	up(&HFS_SB(sb)->bitmap_lock);
+	mutex_unlock(&HFS_SB(sb)->bitmap_lock);
 	hfs_bitmap_dirty(sb);
 
 	return 0;
Index: linux-2.6/fs/hfs/hfs_fs.h
===================================================================
--- linux-2.6.orig/fs/hfs/hfs_fs.h	2008-05-11 20:10:11.000000000 +0200
+++ linux-2.6/fs/hfs/hfs_fs.h	2008-05-11 20:14:08.000000000 +0200
@@ -11,6 +11,7 @@
 
 #include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/mutex.h>
 #include <linux/buffer_head.h>
 #include <linux/fs.h>
 
@@ -139,7 +140,7 @@
 
 	struct nls_table *nls_io, *nls_disk;
 
-	struct semaphore bitmap_lock;
+	struct mutex bitmap_lock;
 
 	unsigned long flags;
 
Index: linux-2.6/fs/hfs/super.c
===================================================================
--- linux-2.6.orig/fs/hfs/super.c	2008-05-11 20:10:11.000000000 +0200
+++ linux-2.6/fs/hfs/super.c	2008-05-11 20:10:18.000000000 +0200
@@ -372,7 +372,7 @@
 
 	sb->s_op = &hfs_super_operations;
 	sb->s_flags |= MS_NODIRATIME;
-	init_MUTEX(&sbi->bitmap_lock);
+	mutex_init(&sbi->bitmap_lock);
 
 	res = hfs_mdb_get(sb);
 	if (res) {

-- 
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona

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