ext3: quota macros cleanup [V2]

Currently all quota block reservation macros contains hardcoded "2"
aka MAXQUOTAS value. This is no good because in some places it is not
obvious to understand what does this digit represent. Let's introduce
new macro with self descriptive name.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index ad14227..455e6e6 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -970,7 +970,7 @@
 		if (max_blocks > DIO_MAX_BLOCKS)
 			max_blocks = DIO_MAX_BLOCKS;
 		handle = ext3_journal_start(inode, DIO_CREDITS +
-				2 * EXT3_QUOTA_TRANS_BLOCKS(inode->i_sb));
+				EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
 		if (IS_ERR(handle)) {
 			ret = PTR_ERR(handle);
 			goto out;
@@ -3146,8 +3146,8 @@
 
 		/* (user+group)*(old+new) structure, inode write (sb,
 		 * inode block, ? - but truncate inode update has it) */
-		handle = ext3_journal_start(inode, 2*(EXT3_QUOTA_INIT_BLOCKS(inode->i_sb)+
-					EXT3_QUOTA_DEL_BLOCKS(inode->i_sb))+3);
+		handle = ext3_journal_start(inode, EXT3_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+
+					EXT3_MAXQUOTAS_DEL_BLOCKS(inode->i_sb)+3);
 		if (IS_ERR(handle)) {
 			error = PTR_ERR(handle);
 			goto err_out;
@@ -3239,7 +3239,7 @@
 #ifdef CONFIG_QUOTA
 	/* We know that structure was already allocated during vfs_dq_init so
 	 * we will be updating only the data blocks + inodes */
-	ret += 2*EXT3_QUOTA_TRANS_BLOCKS(inode->i_sb);
+	ret += EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
 #endif
 
 	return ret;