ext4: Rename read_block_bitmap() to ext4_read_block_bitmap()

Since this a non-static function, make it be ext4 specific to avoid
conflicts with potentially other filesystems.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6d69dd9..21ee6d4 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2326,7 +2326,7 @@
 			meta_group_info[j]->bb_bitmap =
 				kmalloc(sb->s_blocksize, GFP_KERNEL);
 			BUG_ON(meta_group_info[j]->bb_bitmap == NULL);
-			bh = read_block_bitmap(sb, i);
+			bh = ext4_read_block_bitmap(sb, i);
 			BUG_ON(bh == NULL);
 			memcpy(meta_group_info[j]->bb_bitmap, bh->b_data,
 					sb->s_blocksize);
@@ -2769,7 +2769,7 @@
 
 
 	err = -EIO;
-	bitmap_bh = read_block_bitmap(sb, ac->ac_b_ex.fe_group);
+	bitmap_bh = ext4_read_block_bitmap(sb, ac->ac_b_ex.fe_group);
 	if (!bitmap_bh)
 		goto out_err;
 
@@ -3589,7 +3589,7 @@
 	if (list_empty(&grp->bb_prealloc_list))
 		return 0;
 
-	bitmap_bh = read_block_bitmap(sb, group);
+	bitmap_bh = ext4_read_block_bitmap(sb, group);
 	if (bitmap_bh == NULL) {
 		/* error handling here */
 		ext4_mb_release_desc(&e4b);
@@ -3763,7 +3763,7 @@
 		err = ext4_mb_load_buddy(sb, group, &e4b);
 		BUG_ON(err != 0); /* error handling here */
 
-		bitmap_bh = read_block_bitmap(sb, group);
+		bitmap_bh = ext4_read_block_bitmap(sb, group);
 		if (bitmap_bh == NULL) {
 			/* error handling here */
 			ext4_mb_release_desc(&e4b);
@@ -4262,7 +4262,7 @@
 		overflow = bit + count - EXT4_BLOCKS_PER_GROUP(sb);
 		count -= overflow;
 	}
-	bitmap_bh = read_block_bitmap(sb, block_group);
+	bitmap_bh = ext4_read_block_bitmap(sb, block_group);
 	if (!bitmap_bh)
 		goto error_return;
 	gdp = ext4_get_group_desc(sb, block_group, &gd_bh);