From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
A medium access request is defined as an internal regular request that
operates on a whole number of logical blocks of the storage medium.
These include REQ_OP_READ, REQ_OP_WRITE, REQ_OP_FLUSH, REQ_OP_DISCARD,
REQ_OP_SECURE_ERASE, REQ_OP_WRITE_SAME and REQ_OP_WRITE_ZEROES.
Zoned block device requests (REQ_OP_ZONE_REPORT and REQ_OP_ZONE_RESET)
as well as SCSI passthrough and driver private commands are not
considered medium access request.
Reshuffle enum req_opf definitions grouping medium access request up
to REQ_OP_MEDIUM_LAST and introduce the helper function
blk_rq_accesses_medium() to test a request.
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
---
include/linux/blk_types.h | 17 ++++++++++-------
include/linux/blkdev.h | 12 ++++++++++++
2 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index d703acb..6420057 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -151,16 +151,19 @@ enum req_opf {
REQ_OP_FLUSH = 2,
/* discard sectors */
REQ_OP_DISCARD = 3,
- /* get zone information */
- REQ_OP_ZONE_REPORT = 4,
/* securely erase sectors */
- REQ_OP_SECURE_ERASE = 5,
- /* seset a zone write pointer */
- REQ_OP_ZONE_RESET = 6,
+ REQ_OP_SECURE_ERASE = 4,
/* write the same sector many times */
- REQ_OP_WRITE_SAME = 7,
+ REQ_OP_WRITE_SAME = 5,
/* write the zero filled sector many times */
- REQ_OP_WRITE_ZEROES = 8,
+ REQ_OP_WRITE_ZEROES = 6,
+
+ REQ_OP_MEDIUM_LAST = REQ_OP_WRITE_ZEROES,
+
+ /* get zone information */
+ REQ_OP_ZONE_REPORT = 16,
+ /* reset a zone write pointer */
+ REQ_OP_ZONE_RESET = 17,
/* SCSI passthrough using struct scsi_request */
REQ_OP_SCSI_IN = 32,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index aecca0e..7d1ce2d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -248,6 +248,18 @@ static inline bool blk_rq_is_passthrough(struct request *rq)
return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
}
+/**
+ * blk_rq_accesses_medium - test if a request is a medium access request
+ * @rq: A block layer request.
+ *
+ * A medium access request is a regular internal request that operates on
+ * a whole number of logical blocks of the storage medium.
+ */
+static inline bool blk_rq_accesses_medium(const struct request *rq)
+{
+ return req_op(rq) <= REQ_OP_MEDIUM_LAST;
+}
+
static inline unsigned short req_get_ioprio(struct request *req)
{
return req->ioprio;
--
2.9.3
