[PATCH v4 03/36] scsi: Add struct for args to execution functions

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This begins to move the SCSI execution functions to use a struct for
passing in args. This patch adds the new struct, converts the low level
helpers and then adds a new helper the next patches will convert the rest
of the code to.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
Reviewed-by: Martin Wilck <mwilck@xxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 drivers/scsi/scsi_lib.c    | 69 +++++++++++++++-----------------------
 include/scsi/scsi_device.h | 69 ++++++++++++++++++++++++++++++--------
 2 files changed, 82 insertions(+), 56 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index eae438d53ac5..f0c55e2621da 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -185,55 +185,39 @@ void scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
 	__scsi_queue_insert(cmd, reason, true);
 }
 
-
 /**
- * __scsi_execute - insert request and wait for the result
- * @sdev:	scsi device
- * @cmd:	scsi command
- * @data_direction: data direction
- * @buffer:	data buffer
- * @bufflen:	len of buffer
- * @sense:	optional sense buffer
- * @sshdr:	optional decoded sense header
- * @timeout:	request timeout in HZ
- * @retries:	number of times to retry request
- * @flags:	flags for ->cmd_flags
- * @rq_flags:	flags for ->rq_flags
- * @resid:	optional residual length
+ * __scsi_exec_req - insert request and wait for the result
+ * @scsi_exec_args: See struct definition for description of each field
  *
  * Returns the scsi_cmnd result field if a command was executed, or a negative
  * Linux error code if we didn't get that far.
  */
-int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
-		 int data_direction, void *buffer, unsigned bufflen,
-		 unsigned char *sense, struct scsi_sense_hdr *sshdr,
-		 int timeout, int retries, blk_opf_t flags,
-		 req_flags_t rq_flags, int *resid)
+int __scsi_exec_req(const struct scsi_exec_args *args)
 {
 	struct request *req;
 	struct scsi_cmnd *scmd;
 	int ret;
 
-	req = scsi_alloc_request(sdev->request_queue,
-			data_direction == DMA_TO_DEVICE ?
-			REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
-			rq_flags & RQF_PM ? BLK_MQ_REQ_PM : 0);
+	req = scsi_alloc_request(args->sdev->request_queue,
+				 args->data_dir == DMA_TO_DEVICE ?
+				 REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
+				 args->req_flags & RQF_PM ? BLK_MQ_REQ_PM : 0);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
-	if (bufflen) {
-		ret = blk_rq_map_kern(sdev->request_queue, req,
-				      buffer, bufflen, GFP_NOIO);
+	if (args->buf) {
+		ret = blk_rq_map_kern(args->sdev->request_queue, req, args->buf,
+				      args->buf_len, GFP_NOIO);
 		if (ret)
 			goto out;
 	}
 	scmd = blk_mq_rq_to_pdu(req);
-	scmd->cmd_len = COMMAND_SIZE(cmd[0]);
-	memcpy(scmd->cmnd, cmd, scmd->cmd_len);
-	scmd->allowed = retries;
-	req->timeout = timeout;
-	req->cmd_flags |= flags;
-	req->rq_flags |= rq_flags | RQF_QUIET;
+	scmd->cmd_len = COMMAND_SIZE(args->cmd[0]);
+	memcpy(scmd->cmnd, args->cmd, scmd->cmd_len);
+	scmd->allowed = args->retries;
+	req->timeout = args->timeout;
+	req->cmd_flags |= args->op_flags;
+	req->rq_flags |= args->req_flags | RQF_QUIET;
 
 	/*
 	 * head injection *required* here otherwise quiesce won't work
@@ -246,23 +230,24 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 	 * is invalid.  Prevent the garbage from being misinterpreted
 	 * and prevent security leaks by zeroing out the excess data.
 	 */
-	if (unlikely(scmd->resid_len > 0 && scmd->resid_len <= bufflen))
-		memset(buffer + bufflen - scmd->resid_len, 0, scmd->resid_len);
-
-	if (resid)
-		*resid = scmd->resid_len;
-	if (sense && scmd->sense_len)
-		memcpy(sense, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
-	if (sshdr)
+	if (unlikely(scmd->resid_len > 0 && scmd->resid_len <= args->buf_len))
+		memset(args->buf + args->buf_len - scmd->resid_len, 0,
+		       scmd->resid_len);
+
+	if (args->resid)
+		*args->resid = scmd->resid_len;
+	if (args->sense && scmd->sense_len)
+		memcpy(args->sense, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
+	if (args->sshdr)
 		scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
-				     sshdr);
+				     args->sshdr);
 	ret = scmd->result;
  out:
 	blk_mq_free_request(req);
 
 	return ret;
 }
-EXPORT_SYMBOL(__scsi_execute);
+EXPORT_SYMBOL(__scsi_exec_req);
 
 /*
  * Wake up the error handler if necessary. Avoid as follows that the error
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index c36656d8ac6c..d49a7157d7c1 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -455,28 +455,69 @@ extern const char *scsi_device_state_name(enum scsi_device_state);
 extern int scsi_is_sdev_device(const struct device *);
 extern int scsi_is_target_device(const struct device *);
 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
-extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
-			int data_direction, void *buffer, unsigned bufflen,
-			unsigned char *sense, struct scsi_sense_hdr *sshdr,
-			int timeout, int retries, blk_opf_t flags,
-			req_flags_t rq_flags, int *resid);
+
+struct scsi_exec_args {
+	struct scsi_device *sdev;	/* scsi device */
+	const unsigned char *cmd;	/* scsi command */
+	int data_dir;			/* DMA direction */
+	void *buf;			/* data buffer */
+	unsigned int buf_len;		/* len of buffer */
+	unsigned char *sense;		/* optional sense buffer */
+	unsigned int sense_len;		/* optional sense buffer len */
+	struct scsi_sense_hdr *sshdr;	/* optional decoded sense header */
+	int timeout;			/* request timeout in HZ */
+	int retries;			/* number of times to retry request */
+	blk_opf_t op_flags;		/* flags for ->cmd_flags */
+	req_flags_t req_flags;		/* flags for ->rq_flags */
+	int *resid;			/* optional residual length */
+};
+
+extern int __scsi_exec_req(const struct scsi_exec_args *args);
+/* Make sure any sense buffer is the correct size. */
+#define scsi_exec_req(args)						\
+({									\
+	BUILD_BUG_ON(args.sense &&					\
+		     args.sense_len != SCSI_SENSE_BUFFERSIZE);		\
+	__scsi_exec_req(&args);					\
+})
+
 /* Make sure any sense buffer is the correct size. */
-#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense,	\
-		     sshdr, timeout, retries, flags, rq_flags, resid)	\
+#define scsi_execute(_sdev, _cmd, _data_dir, _buffer, _bufflen, _sense,	\
+		     _sshdr, _timeout, _retries, _flags, _rq_flags,	\
+		     _resid)						\
 ({									\
-	BUILD_BUG_ON((sense) != NULL &&					\
-		     sizeof(sense) != SCSI_SENSE_BUFFERSIZE);		\
-	__scsi_execute(sdev, cmd, data_direction, buffer, bufflen,	\
-		       sense, sshdr, timeout, retries, flags, rq_flags,	\
-		       resid);						\
+	BUILD_BUG_ON((_sense) != NULL &&				\
+		     sizeof(_sense) != SCSI_SENSE_BUFFERSIZE);		\
+	__scsi_exec_req(&((struct scsi_exec_args) {			\
+				.sdev = _sdev,				\
+				.cmd = _cmd,				\
+				.data_dir = _data_dir,			\
+				.buf = _buffer,				\
+				.buf_len = _bufflen,			\
+				.sense = _sense,			\
+				.sshdr = _sshdr,			\
+				.timeout = _timeout,			\
+				.retries = _retries,			\
+				.op_flags = _flags,			\
+				.req_flags = _rq_flags,			\
+				.resid = _resid, }));			\
 })
+
 static inline int scsi_execute_req(struct scsi_device *sdev,
 	const unsigned char *cmd, int data_direction, void *buffer,
 	unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 	int retries, int *resid)
 {
-	return scsi_execute(sdev, cmd, data_direction, buffer,
-		bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
+	return __scsi_exec_req(&(struct scsi_exec_args) {
+					.sdev = sdev,
+					.cmd = cmd,
+					.data_dir = data_direction,
+					.buf = buffer,
+					.buf_len = bufflen,
+					.sshdr = sshdr,
+					.timeout = timeout,
+					.retries = retries,
+					.resid = resid });
 }
 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 extern void sdev_enable_disk_events(struct scsi_device *sdev);
-- 
2.25.1




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