From f583f4924d669d36de677e0cc2422ee95203d444 Mon Sep 17 00:00:00 2001 From: David C Somayajulu Date: Wed, 4 Oct 2006 08:27:25 +0200 Subject: [PATCH] [PATCH] helper function for retrieving scsi_cmd given host based block layer tag This was necessitated by the need for a function to get back to a scsi_cmnd, when an hba the posts its (corresponding) completion interrupt with a block layer tag as its reference. Signed-off-by: Mike Christie Signed-off-by: David Somayajulu Signed-off-by: Jens Axboe --- block/ll_rw_blk.c | 7 +------ include/linux/blkdev.h | 8 ++++++++ include/scsi/scsi_tcq.h | 20 ++++++++++++++++++++ 3 files changed, 29 insertions(+), 6 deletions(-) diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 83425fb3c8db..c847e17e5caa 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -840,12 +840,7 @@ EXPORT_SYMBOL(blk_queue_dma_alignment); **/ struct request *blk_queue_find_tag(request_queue_t *q, int tag) { - struct blk_queue_tag *bqt = q->queue_tags; - - if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) - return NULL; - - return bqt->tag_index[tag]; + return blk_map_queue_find_tag(q->queue_tags, tag); } EXPORT_SYMBOL(blk_queue_find_tag); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1d79b8d4ca6d..26f7856ff812 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -769,6 +769,14 @@ extern struct blk_queue_tag *blk_init_tags(int); extern void blk_free_tags(struct blk_queue_tag *); extern void blk_congestion_end(int rw); +static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, + int tag) +{ + if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) + return NULL; + return bqt->tag_index[tag]; +} + extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *); extern int blkdev_issue_flush(struct block_device *, sector_t *); diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h index c247a28259bc..cf4c219c0b5c 100644 --- a/include/scsi/scsi_tcq.h +++ b/include/scsi/scsi_tcq.h @@ -144,5 +144,25 @@ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth) return shost->bqt ? 0 : -ENOMEM; } +/** + * scsi_host_find_tag - find the tagged command by host + * @shost: pointer to scsi_host + * @tag: tag of the scsi_cmnd + * + * Notes: + * Only works with tags allocated by the generic blk layer. + **/ +static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, + int tag) +{ + struct request *req; + + if (tag != SCSI_NO_TAG) { + req = blk_map_queue_find_tag(shost->bqt, tag); + return req ? (struct scsi_cmnd *)req->special : NULL; + } + return NULL; +} + #endif /* CONFIG_BLOCK */ #endif /* _SCSI_SCSI_TCQ_H */