From b58d91547fb17c65ad621f3f98b1f2c228c812a5 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Thu, 16 Nov 2006 19:24:10 +0900 Subject: [SCSI] export scsi-ml functions needed by tgt_scsi_lib and its LLDs This patch contains the needed changes to the scsi-ml for the target mode support. Note, per the last review we moved almost all the fields we added to the scsi_cmnd to our internal data structure which we are going to try and kill off when we can replace it with support from other parts of the kernel. The one field we left on was the offset variable. This is needed to handle the case where the target gets request that is so large that it cannot execute it in one dma operation. So max_secotors or a segment limit may limit the size of the transfer. In this case our tgt core code will break up the command into managable transfers and send them to the LLD one at a time. The offset is then used to tell the LLD where in the command we are at. Is there another field on the scsi_cmd for that? Signed-off-by: Mike Christie Signed-off-by: FUJITA Tomonori Signed-off-by: James Bottomley --- drivers/scsi/scsi_lib.c | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) (limited to 'drivers/scsi/scsi_lib.c') diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 2f12f9f..fb616c6 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -704,7 +704,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate, return NULL; } -static struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask) +struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask) { struct scsi_host_sg_pool *sgp; struct scatterlist *sgl; @@ -745,7 +745,9 @@ static struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_m return sgl; } -static void scsi_free_sgtable(struct scatterlist *sgl, int index) +EXPORT_SYMBOL(scsi_alloc_sgtable); + +void scsi_free_sgtable(struct scatterlist *sgl, int index) { struct scsi_host_sg_pool *sgp; @@ -755,6 +757,8 @@ static void scsi_free_sgtable(struct scatterlist *sgl, int index) mempool_free(sgl, sgp->pool); } +EXPORT_SYMBOL(scsi_free_sgtable); + /* * Function: scsi_release_buffers() * @@ -1567,29 +1571,40 @@ u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost) } EXPORT_SYMBOL(scsi_calculate_bounce_limit); -struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) +struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, + request_fn_proc *request_fn) { - struct Scsi_Host *shost = sdev->host; struct request_queue *q; - q = blk_init_queue(scsi_request_fn, NULL); + q = blk_init_queue(request_fn, NULL); if (!q) return NULL; - blk_queue_prep_rq(q, scsi_prep_fn); - blk_queue_max_hw_segments(q, shost->sg_tablesize); blk_queue_max_phys_segments(q, SCSI_MAX_PHYS_SEGMENTS); blk_queue_max_sectors(q, shost->max_sectors); blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost)); blk_queue_segment_boundary(q, shost->dma_boundary); - blk_queue_issue_flush_fn(q, scsi_issue_flush_fn); - blk_queue_softirq_done(q, scsi_softirq_done); if (!shost->use_clustering) clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); return q; } +EXPORT_SYMBOL(__scsi_alloc_queue); + +struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) +{ + struct request_queue *q; + + q = __scsi_alloc_queue(sdev->host, scsi_request_fn); + if (!q) + return NULL; + + blk_queue_prep_rq(q, scsi_prep_fn); + blk_queue_issue_flush_fn(q, scsi_issue_flush_fn); + blk_queue_softirq_done(q, scsi_softirq_done); + return q; +} void scsi_free_queue(struct request_queue *q) { -- cgit v1.1