On Mon, Dec 05, 2011 at 11:40:15AM -0500, Ted Ts'o wrote:

On Mon, Nov 28, 2011 at 03:27:25PM -0800, Darrick J. Wong wrote:

quoted

 /*
+ * This is the extent tail on-disk structure.
+ * All other extent structures are 12 bytes long.  It turns out that
+ * block_size % 12 >= 4 for all valid block sizes (1k, 2k, 4k).

More generally, block_size % 12 is >= 4 for all powers of 2 greater
than 12 bytes.  I'd probably remove (1k, 2k, 4k) because that might
scare people who might say, "hey!  I'm using a 16k block size on my
HPC system running on a Power or Itanium box --- am I going to be OK?".
Valid block sizes go up to the page size of the hardware in question...

Ok.

--D