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authorChristoph Hellwig <hch@lst.de>2014-11-03 12:47:47 +0100
committerChristoph Hellwig <hch@lst.de>2014-11-12 11:19:40 +0100
commit125c99bc8b6b108d251169a86324a7ed3c6f3cce (patch)
tree58c721993e8b2be80e2993ea864529923c904b29 /include/scsi
parenta62182f338b39a22035531c6afc0a8d2928b1df2 (diff)
scsi: add new scsi-command flag for tagged commands
Currently scsi piggy backs on the block layer to define the concept of a tagged command. But we want to be able to have block-level host-wide tags assigned even for untagged commands like the initial INQUIRY, so add a new SCSI-level flag for commands that are tagged at the scsi level, so that even commands without that set can have tags assigned to them. Note that this alredy is the case for the blk-mq code path, and this just lets the old path catch up with it. We also set this flag based upon sdev->simple_tags instead of the block queue flag, so that it is entirely independent of the block layer tagging, and thus always correct even if a driver doesn't use block level tagging yet. Also remove the old blk_rq_tagged; it was only used by SCSI drivers, and removing it forces them to look for the proper replacement. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi_cmnd.h4
-rw-r--r--include/scsi/scsi_tcq.h6
2 files changed, 6 insertions, 4 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 522a5f27f553..e119142e565e 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -53,6 +53,9 @@ struct scsi_pointer {
volatile int phase;
};
+/* for scmd->flags */
+#define SCMD_TAGGED (1 << 0)
+
struct scsi_cmnd {
struct scsi_device *device;
struct list_head list; /* scsi_cmnd participates in queue lists */
@@ -132,6 +135,7 @@ struct scsi_cmnd {
* to be at an address < 16Mb). */
int result; /* Status code from lower level driver */
+ int flags; /* Command flags */
unsigned char tag; /* SCSI-II queued command tag */
};
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index 1712dab6e00e..032df74b66d7 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -101,11 +101,9 @@ static inline void scsi_deactivate_tcq(struct scsi_device *sdev, int depth)
**/
static inline int scsi_populate_tag_msg(struct scsi_cmnd *cmd, char *msg)
{
- struct request *req = cmd->request;
-
- if (blk_rq_tagged(req)) {
+ if (cmd->flags & SCMD_TAGGED) {
*msg++ = MSG_SIMPLE_TAG;
- *msg++ = req->tag;
+ *msg++ = cmd->request->tag;
return 2;
}