D13428.diff
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	Index: head/sys/ufs/ffs/ffs_alloc.c
	===================================================================
	--- head/sys/ufs/ffs/ffs_alloc.c
	+++ head/sys/ufs/ffs/ffs_alloc.c
	@@ -1958,6 +1958,16 @@
	}

	/*
	+ * Synchronous inode initialization is needed only when barrier writes do not
	+ * work as advertised, and will impose a heavy cost on file creation in a newly
	+ * created filesystem.
	+ */
	+static int doasyncinodeinit = 1;
	+SYSCTL_INT(_vfs_ffs, OID_AUTO, doasyncinodeinit, CTLFLAG_RWTUN,
	+ &doasyncinodeinit, 0,
	+ "Perform inode block initialization using asynchronous writes");
	+
	+/*
	* Determine whether an inode can be allocated.
	*
	* Check to see if an inode is available, and if it is,
	@@ -2065,6 +2075,7 @@
	dp2->di_gen = arc4random();
	dp2++;
	}
	+
	/*
	* Rather than adding a soft updates dependency to ensure
	* that the new inode block is written before it is claimed
	@@ -2074,7 +2085,10 @@
	* written. The barrier write should only slow down bulk
	* loading of newly created filesystems.
	*/
	- babarrierwrite(ibp);
	+ if (doasyncinodeinit)
	+ babarrierwrite(ibp);
	+ else
	+ bwrite(ibp);

	/*
	* After the inode block is written, try to update the