From: NeilBrown <neilb@suse.de>
Date: Sun, 27 Jun 2010 23:13:17 +0000 (+1000)
Subject: Get block ref in lafs_add_block_address
X-Git-Url: http://git.neil.brown.name/?a=commitdiff_plain;h=7505f46be2b5cd2db2cd82d42c1ef04e645efaad;p=LaFS.git

Get block ref in lafs_add_block_address

It is possible to lose the ref on the parent that we
have before the final use to unlock, so make sure to
hold our own reference.

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

diff --git a/index.c b/index.c
index 0607988..07ff762 100644
--- a/index.c
+++ b/index.c
@@ -1993,10 +1993,14 @@ int lafs_add_block_address(struct fs *fs, struct block *blk)
 		return 1;
 	} else {
 		spin_unlock(&blk->inode->i_data.private_lock);
-
+		/* We own a ref through blk->parent now, but
+		 * after lafs_incorporate, we might not
+		 */
+		getiref(p,MKREF("addblock"));
 		lafs_iolock_written(&p->b);
 		lafs_incorporate(fs, p);
 		lafs_iounlock_block(&p->b);
+		putiref(p,MKREF("addblock"));
 		return 0;
 	}
 }