[PATCH] Remove ext3's buffer_head cache

Removes ext3's open-coded inode and allocation bitmap LRUs.

This patch includes a cleanup to ext3_new_block().  The local variables
`bh', `bh2', `i', `j', `k' and `tmp' have been renamed to something
more palatable.

fs/ext3/super.c

@@ -417,10 +417,6 @@ void ext3_put_super (struct super_block * sb)
 	for (i = 0; i < sbi->s_gdb_count; i++)
 		brelse(sbi->s_group_desc[i]);
 	kfree(sbi->s_group_desc);
-	for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++)
-		brelse(sbi->s_inode_bitmap[i]);
-	for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++)
-		brelse(sbi->s_block_bitmap[i]);
 	brelse(sbi->s_sbh);
 
 	/* Debugging code just in case the in-memory inode orphan list
@@ -1150,14 +1146,6 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 		printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
 		goto failed_mount2;
 	}
-	for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++) {
-		sbi->s_inode_bitmap_number[i] = 0;
-		sbi->s_inode_bitmap[i] = NULL;
-		sbi->s_block_bitmap_number[i] = 0;
-		sbi->s_block_bitmap[i] = NULL;
-	}
-	sbi->s_loaded_inode_bitmaps = 0;
-	sbi->s_loaded_block_bitmaps = 0;
 	sbi->s_gdb_count = db_count;
 	/*
 	 * set up enough so that it can read an inode

include/linux/ext3_fs_sb.h

@@ -21,14 +21,6 @@
 #include <linux/wait.h>
 #endif
 
-/*
- * The following is not needed anymore since the descriptors buffer
- * heads are now dynamically allocated
- */
-/* #define EXT3_MAX_GROUP_DESC	8 */
-
-#define EXT3_MAX_GROUP_LOADED	8
-
 /*
  * third extended-fs super-block data in memory
  */
@@ -46,12 +38,6 @@ struct ext3_sb_info {
 	struct buffer_head * s_sbh;	/* Buffer containing the super block */
 	struct ext3_super_block * s_es;	/* Pointer to the super block in the buffer */
 	struct buffer_head ** s_group_desc;
-	unsigned short s_loaded_inode_bitmaps;
-	unsigned short s_loaded_block_bitmaps;
-	unsigned long s_inode_bitmap_number[EXT3_MAX_GROUP_LOADED];
-	struct buffer_head * s_inode_bitmap[EXT3_MAX_GROUP_LOADED];
-	unsigned long s_block_bitmap_number[EXT3_MAX_GROUP_LOADED];
-	struct buffer_head * s_block_bitmap[EXT3_MAX_GROUP_LOADED];
 	unsigned long  s_mount_opt;
 	uid_t s_resuid;
 	gid_t s_resgid;