Re: [PATCH 2/3] block layer varlen-cdb

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On Sun, Feb 10, 2008 at 09:09:41PM +0200, Boaz Harrosh wrote:
> - add varlen_cdb and varlen_cdb_len to hold a large user cdb
>   if needed. They start as empty. Allocation of buffer must
>   be done by user and held until request execution is done.
> - Since there can be either a fix_length command up to 16 bytes
>   or a variable_length, larger then 16 bytes, commands but never
>   both, we hold the two types in a union to save space. The
>   presence of varlen_cdb_len and cmd_len==0 signals a varlen_cdb
>   mode.

this one I'm a bit confused by, why can't we just set the length
of the variable length command in cmd_len aswell, and if cmd_len >
the length of the cmd array it's a variable length command?

Note that this is both to keep the logic simpler and not to grow
struct request further.  Especially for the rather rare case
of a bidi command.
-
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