On Tue, Feb 12 2008 at 19:45 +0200, Christoph Hellwig <[EMAIL PROTECTED]> wrote: > On Sun, Feb 10, 2008 at 09:05:17PM +0200, Boaz Harrosh wrote: >> - Lots of drivers still use MAX_COMMAND_SIZE. So I have left >> that #define but equate it to BLK_MAX_CDB. The way I see it >> and is reflected in the patch below is. >> MAX_COMMAND_SIZE - means: The longest fixed-length (*) SCSI CDB >> as per the SCSI standard and is not related >> to the implementation. >> BLK_MAX_CDB. - The allocated space at the request level >> >> (*)fixed-length here means commands that their size can be determined >> by their opcode and the CDB does not carry a length specifier, like >> the VARIABLE_LENGTH_CMD(0x7f) command. This is actually not exactly >> true and the SCSI standard also defines extended commands and >> vendor specific commands that can be bigger than 16 bytes. The kernel >> will support these using the same infrastructure used for VARLEN CDB's. >> So in effect MAX_COMMAND_SIZE means the maximum size command >> scsi-ml supports without specifying a cmd_len by ULD's > > A comment like this should be near the declaration of MAX_COMMAND_SIZE > >> +#define MAX_COMMAND_SIZE 16 >> +#if (MAX_COMMAND_SIZE > BLK_MAX_CDB) >> +# error MAX_COMMAND_SIZE can not be smaller than BLK_MAX_CDB >> +#endif > > No tabs between the # and the rest of the cpp command, please. Either > nothing or a single space as indentation instead. > > Except for those two small nitpicks this looks very good to me. Nice > memory saving aswel. Agree with both comments. Thanks for the review, will fix in the next submission.
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