From: NeilBrown <neilb@suse.de>
Date: Fri, 13 Aug 2010 11:32:11 +0000 (+1000)
Subject: roll: don't update index if block address hasn't changed.
X-Git-Url: http://git.neil.brown.name/?a=commitdiff_plain;h=8fe5e3c7862aff271286e2fa4f36bb5182e725c2;p=LaFS.git

roll: don't update index if block address hasn't changed.

This is quite possible if the block was pushed out in the previous
phase, and could save some work

Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/roll.c b/roll.c
index e6f605b..c75b1b4 100644
--- a/roll.c
+++ b/roll.c
@@ -327,6 +327,9 @@ roll_block(struct fs *fs, int fsnum, int inum, int trunc, int flg,
 		err = lafs_find_block(blk, ADOPT);
 		if (err)
 			break;
+		if (blk->b.physaddr == baddr)
+			/* already correctly indexed */
+			break;
 
 		/* FIXME do I need to dirty the inode to flush
 		 * this change into the datablock?