[PATCH] Make EXT2_DEBUG work again

This patch makes EXT2_DEBUG work again.  Due to lack of proper include
file, EXT2_DEBUG was undefined in bitmap.c and ext2_count_free() is left
out.  Moved to balloc.c and removed bitmap.c entirely.

Second, debug versions of ext2_count_free_{inodes/blocks} reacquires
superblock lock.  Moved lock into callers.

Signed-off-by: Val Henson <val_henson@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ext2/Makefile

@@ -4,7 +4,7 @@
 
 obj-$(CONFIG_EXT2_FS) += ext2.o
 
-ext2-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
+ext2-y := balloc.o dir.o file.o fsync.o ialloc.o inode.o \
 	  ioctl.o namei.o super.o symlink.o
 
 ext2-$(CONFIG_EXT2_FS_XATTR)	 += xattr.o xattr_user.o xattr_trusted.o

fs/ext2/balloc.c

@@ -521,6 +521,26 @@ int ext2_new_block(struct inode *inode, unsigned long goal,
 	goto out_release;
 }
 
+#ifdef EXT2FS_DEBUG
+
+static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
+
+unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
+{
+	unsigned int i;
+	unsigned long sum = 0;
+
+	if (!map)
+		return (0);
+	for (i = 0; i < numchars; i++)
+		sum += nibblemap[map->b_data[i] & 0xf] +
+			nibblemap[(map->b_data[i] >> 4) & 0xf];
+	return (sum);
+}
+
+#endif  /*  EXT2FS_DEBUG  */
+
+/* Superblock must be locked */
 unsigned long ext2_count_free_blocks (struct super_block * sb)
 {
 	struct ext2_group_desc * desc;
@@ -530,7 +550,6 @@ unsigned long ext2_count_free_blocks (struct super_block * sb)
 	unsigned long bitmap_count, x;
 	struct ext2_super_block *es;
 
-	lock_super (sb);
 	es = EXT2_SB(sb)->s_es;
 	desc_count = 0;
 	bitmap_count = 0;
@@ -554,7 +573,6 @@ unsigned long ext2_count_free_blocks (struct super_block * sb)
 	printk("ext2_count_free_blocks: stored = %lu, computed = %lu, %lu\n",
 		(long)le32_to_cpu(es->s_free_blocks_count),
 		desc_count, bitmap_count);
-	unlock_super (sb);
 	return bitmap_count;
 #else
         for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {

fs/ext2/ialloc.c

@@ -638,6 +638,7 @@ struct inode *ext2_new_inode(struct inode *dir, int mode)
 	return ERR_PTR(err);
 }
 
+/* Superblock must be locked */
 unsigned long ext2_count_free_inodes (struct super_block * sb)
 {
 	struct ext2_group_desc *desc;
@@ -649,7 +650,6 @@ unsigned long ext2_count_free_inodes (struct super_block * sb)
 	unsigned long bitmap_count = 0;
 	struct buffer_head *bitmap_bh = NULL;
 
-	lock_super (sb);
 	es = EXT2_SB(sb)->s_es;
 	for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
 		unsigned x;
@@ -672,7 +672,6 @@ unsigned long ext2_count_free_inodes (struct super_block * sb)
 	printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
 		percpu_counter_read(&EXT2_SB(sb)->s_freeinodes_counter),
 		desc_count, bitmap_count);
-	unlock_super(sb);
 	return desc_count;
 #else
 	for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {

fs/ext2/super.c

@@ -1045,6 +1045,7 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
 	unsigned long overhead;
 	int i;
 
+	lock_super(sb);
 	if (test_opt (sb, MINIX_DF))
 		overhead = 0;
 	else {
@@ -1085,6 +1086,7 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
 	buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
 	buf->f_ffree = ext2_count_free_inodes (sb);
 	buf->f_namelen = EXT2_NAME_LEN;
+	unlock_super(sb);
 	return 0;
 }