shithub: gefs

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fs: sync the dl before updating the tree, add write barrier before syncing snaps

--- a/fs.c

+++ b/fs.c

@@ -73,6 +73,10 @@

 		nexterror();

 	}

+	/* 

+	 * Wait for data that we're syncing to hit disk

+	 */

+	wrbarrier();

 	/*

 	 * pass 0: Update all open snapshots, and

 	 *  pack the blocks we want to sync. Snap

@@ -83,10 +87,10 @@

          */

 	qlock(&fs->mutlk);

 	lock(&fs->mountlk);

+	dlsync();

 	for(mnt = fs->mounts; mnt != nil; mnt = mnt->next)

 		updatesnap(&mnt->root, mnt->root, mnt->name);

 	unlock(&fs->mountlk);

-	dlsync();

 	for(i = 0; i < fs->narena; i++){

 		a = &fs->arenas[i];

 		qlock(a);