On Wed, 5 Jun 2002, Greywolf wrote:

> On Wed, 5 Jun 2002, Bill Studenmund wrote:
>
> # > I think you don't see what it's doing up there.
> # >
> # > fsbtodb converts filesystem _blocks_ to physical sectors, not frags.
> #
> # Yes, and at this level of the code, a file system block is a fragment.
> # i.e. on an 8k/1k ffs, dbtofsb() converts to the 1k things, not the 8k
> # things.
>
> What?!?
>
> You mean to tell me that fs_bsize is representative of the fragment size
> and not the block size...?
>
> That's confusing to read.  Why isn't it using fs_fsize instead?

No, I'm not saying that fs_bsize is the fragment size.

I'm saying that fsbtodb converts from "fragments" to disk blocks.

Here's a portion of a dump of an 8k/1k ffs I have:

bsize   8192    shift   13      mask    0xffffe000
fsize   1024    shift   10      mask    0xfffffc00
frag    8       shift   3       fsbtodb 1

As you can see, fsbtodb only makes sense to convert between fragments (1k)
and disk blocks.

Also, don't forget that fragments, not "blocks" are the fundamental
allocation unit for ffs. :-)

Take care,

Bill