Re: [PATCH] reworked IDE/general tagged command queueing

[Jens Axboe <axboe@suse.de>]

On Wed, May 01 2002, Martin Dalecki wrote:
> >Well after a short cross over look at it I agree.
> >The generic interface looks sane for me as well. However
> >I will have to look a bit deeper, becouse at the first sight
> >the double pointer to tag_index looks a bit "overelaborate"
> >to me. But I may change my opinnion after looking at the
> >actual usage - so please take this small bit of critique
> >with a good grain of salt...
> >
> >+#define BLK_TAGS_PER_LONG    (sizeof(unsigned long) * 8)
> >+#define BLK_TAGS_MASK        (BLK_TAGS_PER_LONG - 1)
> >+
> >+struct blk_queue_tag {
> >+ struct request **tag_index;    /* map of busy tags */
> >+ unsigned long *tag_map;        /* bit map of free/busy tags */
> >+ struct list_head busy_list;    /* fifo list of busy tags */
> >+ int busy;            /* current depth */
> >+ int max_depth;
> >+};
> >+
> 
> Well I revoke my objections. tag_index is fine :-).

It should be, it's just an index of pointer to request, so no double
indirections :)

-- 
Jens Axboe