[PATCH 08/10] block: cleanup rq->data_len usages

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With recent unification of fields, it's now guaranteed that
rq->data_len always equals blk_rq_bytes().  Convert all non-IDE direct
users to accessors.  IDE will be converted in a separate patch.

[ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Pete Zaitcev <zaitcev@xxxxxxxxxx>
Cc: Eric Moore <Eric.Moore@xxxxxxx>
Cc: Markus Lidel <Markus.Lidel@xxxxxxxxxxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Eric Moore <Eric.Moore@xxxxxxx>
Cc: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
Cc: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
 drivers/ata/libata-scsi.c                |    2 +-
 drivers/block/ub.c                       |    8 ++++----
 drivers/message/fusion/mptsas.c          |   20 ++++++++++----------
 drivers/message/i2o/i2o_block.c          |    2 +-
 drivers/scsi/libsas/sas_expander.c       |    8 ++++----
 drivers/scsi/libsas/sas_host_smp.c       |   18 +++++++++---------
 drivers/scsi/mpt2sas/mpt2sas_transport.c |   21 +++++++++++----------
 drivers/scsi/osd/osd_initiator.c         |    4 ++--
 drivers/scsi/scsi_lib.c                  |   13 ++++++-------
 drivers/scsi/scsi_tgt_lib.c              |    2 +-
 fs/exofs/osd.c                           |    4 ++--
 11 files changed, 51 insertions(+), 51 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2733b0c..6e4c600 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1084,7 +1084,7 @@ static int atapi_drain_needed(struct request *rq)
 	if (likely(!blk_pc_request(rq)))
 		return 0;
 
-	if (!rq->data_len || (rq->cmd_flags & REQ_RW))
+	if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW))
 		return 0;
 
 	return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index dc3b899..1591f61 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -747,7 +747,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
 {
 	struct request *rq = urq->rq;
 
-	if (rq->data_len == 0) {
+	if (blk_rq_bytes(rq) == 0) {
 		cmd->dir = UB_DIR_NONE;
 	} else {
 		if (rq_data_dir(rq) == WRITE)
@@ -762,7 +762,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
 	memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
 	cmd->cdb_len = rq->cmd_len;
 
-	cmd->len = rq->data_len;
+	cmd->len = blk_rq_bytes(rq);
 
 	/*
 	 * To reapply this to every URB is not as incorrect as it looks.
@@ -783,8 +783,8 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
 
 	if (cmd->error == 0) {
 		if (blk_pc_request(rq)) {
-			if (cmd->act_len < rq->data_len)
-				rq->resid_len = rq->data_len - cmd->act_len;
+			if (cmd->act_len < blk_rq_bytes(rq))
+				rq->resid_len = blk_rq_bytes(rq) - cmd->act_len;
 			scsi_status = 0;
 		} else {
 			if (cmd->act_len != cmd->len) {
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 5d5f347..4e6fcf0 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -1277,8 +1277,8 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	/* do we need to support multiple segments? */
 	if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
 		printk(MYIOC_s_ERR_FMT "%s: multiple segments req %u %u, rsp %u %u\n",
-		    ioc->name, __func__, req->bio->bi_vcnt, req->data_len,
-		    rsp->bio->bi_vcnt, rsp->data_len);
+		    ioc->name, __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
+		    rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
 		return -EINVAL;
 	}
 
@@ -1295,7 +1295,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	smpreq = (SmpPassthroughRequest_t *)mf;
 	memset(smpreq, 0, sizeof(*smpreq));
 
-	smpreq->RequestDataLength = cpu_to_le16(req->data_len - 4);
+	smpreq->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
 	smpreq->Function = MPI_FUNCTION_SMP_PASSTHROUGH;
 
 	if (rphy)
@@ -1321,10 +1321,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 		       MPI_SGE_FLAGS_END_OF_BUFFER |
 		       MPI_SGE_FLAGS_DIRECTION |
 		       mpt_addr_size()) << MPI_SGE_FLAGS_SHIFT;
-	flagsLength |= (req->data_len - 4);
+	flagsLength |= (blk_rq_bytes(req) - 4);
 
 	dma_addr_out = pci_map_single(ioc->pcidev, bio_data(req->bio),
-				      req->data_len, PCI_DMA_BIDIRECTIONAL);
+				      blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
 	if (!dma_addr_out)
 		goto put_mf;
 	mpt_add_sge(psge, flagsLength, dma_addr_out);
@@ -1332,9 +1332,9 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 
 	/* response */
 	flagsLength = MPT_SGE_FLAGS_SSIMPLE_READ;
-	flagsLength |= rsp->data_len + 4;
+	flagsLength |= blk_rq_bytes(rsp) + 4;
 	dma_addr_in =  pci_map_single(ioc->pcidev, bio_data(rsp->bio),
-				      rsp->data_len, PCI_DMA_BIDIRECTIONAL);
+				      blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
 	if (!dma_addr_in)
 		goto unmap;
 	mpt_add_sge(psge, flagsLength, dma_addr_in);
@@ -1357,7 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 		smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
 		memcpy(req->sense, smprep, sizeof(*smprep));
 		req->sense_len = sizeof(*smprep);
-		rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
+		rsp->resid_len = blk_rq_bytes(rsp) - smprep->ResponseDataLength;
 	} else {
 		printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
 		    ioc->name, __func__);
@@ -1365,10 +1365,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	}
 unmap:
 	if (dma_addr_out)
-		pci_unmap_single(ioc->pcidev, dma_addr_out, req->data_len,
+		pci_unmap_single(ioc->pcidev, dma_addr_out, blk_rq_bytes(req),
 				 PCI_DMA_BIDIRECTIONAL);
 	if (dma_addr_in)
-		pci_unmap_single(ioc->pcidev, dma_addr_in, rsp->data_len,
+		pci_unmap_single(ioc->pcidev, dma_addr_in, blk_rq_bytes(rsp),
 				 PCI_DMA_BIDIRECTIONAL);
 put_mf:
 	if (mf)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 510eb47..6b61d28 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -430,7 +430,7 @@ static void i2o_block_end_request(struct request *req, int error,
 		int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
 
 		if (blk_pc_request(req))
-			leftover = req->data_len;
+			leftover = blk_rq_bytes(req);
 
 		if (error)
 			blk_end_request(req, -EIO, leftover);
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 6605ec9..531af9e 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1927,13 +1927,13 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	/* do we need to support multiple segments? */
 	if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
 		printk("%s: multiple segments req %u %u, rsp %u %u\n",
-		       __func__, req->bio->bi_vcnt, req->data_len,
-		       rsp->bio->bi_vcnt, rsp->data_len);
+		       __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
+		       rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
 		return -EINVAL;
 	}
 
-	ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
-			       bio_data(rsp->bio), rsp->data_len);
+	ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
+			       bio_data(rsp->bio), blk_rq_bytes(rsp));
 	if (ret > 0) {
 		/* positive number is the untransferred residual */
 		rsp->resid_len = ret;
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
index 89952ed..be9a951 100644
--- a/drivers/scsi/libsas/sas_host_smp.c
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -137,21 +137,21 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 	int error = -EINVAL;
 
 	/* eight is the minimum size for request and response frames */
-	if (req->data_len < 8 || rsp->data_len < 8)
+	if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
 		goto out;
 
-	if (bio_offset(req->bio) + req->data_len > PAGE_SIZE ||
-	    bio_offset(rsp->bio) + rsp->data_len > PAGE_SIZE) {
+	if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
+	    bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
 		shost_printk(KERN_ERR, shost,
 			"SMP request/response frame crosses page boundary");
 		goto out;
 	}
 
-	req_data = kzalloc(req->data_len, GFP_KERNEL);
+	req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
 
 	/* make sure frame can always be built ... we copy
 	 * back only the requested length */
-	resp_data = kzalloc(max(rsp->data_len, 128U), GFP_KERNEL);
+	resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
 
 	if (!req_data || !resp_data) {
 		error = -ENOMEM;
@@ -160,7 +160,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 
 	local_irq_disable();
 	buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
-	memcpy(req_data, buf, req->data_len);
+	memcpy(req_data, buf, blk_rq_bytes(req));
 	kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
 	local_irq_enable();
 
@@ -176,8 +176,8 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 	resp_data[1] = req_data[1];
 	resp_data[2] = SMP_RESP_FUNC_UNK;
 
-	req->resid_len = req->data_len;
-	rsp->resid_len = rsp->data_len;
+	req->resid_len = blk_rq_bytes(req);
+	rsp->resid_len = blk_rq_bytes(rsp);
 
 	switch (req_data[1]) {
 	case SMP_REPORT_GENERAL:
@@ -264,7 +264,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
 
 	local_irq_disable();
 	buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
-	memcpy(buf, resp_data, rsp->data_len);
+	memcpy(buf, resp_data, blk_rq_bytes(rsp));
 	flush_kernel_dcache_page(bio_page(rsp->bio));
 	kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
 	local_irq_enable();
diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index 53759c5..af95a44 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1041,7 +1041,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
 		printk(MPT2SAS_ERR_FMT "%s: multiple segments req %u %u, "
 		    "rsp %u %u\n", ioc->name, __func__, req->bio->bi_vcnt,
-		    req->data_len, rsp->bio->bi_vcnt, rsp->data_len);
+		    blk_rq_bytes(req), rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
 		return -EINVAL;
 	}
 
@@ -1104,7 +1104,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	*((u64 *)&mpi_request->SASAddress) = (rphy) ?
 	    cpu_to_le64(rphy->identify.sas_address) :
 	    cpu_to_le64(ioc->sas_hba.sas_address);
-	mpi_request->RequestDataLength = cpu_to_le16(req->data_len - 4);
+	mpi_request->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
 	psge = &mpi_request->SGL;
 
 	/* WRITE sgel first */
@@ -1112,13 +1112,13 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	    MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
 	sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
 	dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
-	      req->data_len, PCI_DMA_BIDIRECTIONAL);
+		blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
 	if (!dma_addr_out) {
 		mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
 		goto unmap;
 	}
 
-	ioc->base_add_sg_single(psge, sgl_flags | (req->data_len - 4),
+	ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(req) - 4),
 	    dma_addr_out);
 
 	/* incr sgel */
@@ -1129,14 +1129,14 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
 	    MPI2_SGE_FLAGS_END_OF_LIST);
 	sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
-	dma_addr_in =  pci_map_single(ioc->pdev, bio_data(rsp->bio),
-	      rsp->data_len, PCI_DMA_BIDIRECTIONAL);
+	dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
+				     blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
 	if (!dma_addr_in) {
 		mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
 		goto unmap;
 	}
 
-	ioc->base_add_sg_single(psge, sgl_flags | (rsp->data_len + 4),
+	ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(rsp) + 4),
 	    dma_addr_in);
 
 	dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s - "
@@ -1170,7 +1170,8 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 
 		memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
 		req->sense_len = sizeof(*mpi_reply);
-		rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
+		rsp->resid_len = blk_rq_bytes(rsp) -
+				 mpi_reply->ResponseDataLength;
 	} else {
 		dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
 		    "%s - no reply\n", ioc->name, __func__));
@@ -1186,10 +1187,10 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 
  unmap:
 	if (dma_addr_out)
-		pci_unmap_single(ioc->pdev, dma_addr_out, req->data_len,
+		pci_unmap_single(ioc->pdev, dma_addr_out, blk_rq_bytes(req),
 		    PCI_DMA_BIDIRECTIONAL);
 	if (dma_addr_in)
-		pci_unmap_single(ioc->pdev, dma_addr_in, rsp->data_len,
+		pci_unmap_single(ioc->pdev, dma_addr_in, blk_rq_bytes(rsp),
 		    PCI_DMA_BIDIRECTIONAL);
 
  out:
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 2a5f077..d178a8b 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -1299,7 +1299,7 @@ int osd_finalize_request(struct osd_request *or,
 			return ret;
 		}
 		OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n",
-			_LLU(or->out.total_bytes), or->out.req->data_len);
+			_LLU(or->out.total_bytes), blk_rq_bytes(or->out.req));
 	}
 	if (or->in.bio) {
 		ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio);
@@ -1308,7 +1308,7 @@ int osd_finalize_request(struct osd_request *or,
 			return ret;
 		}
 		OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n",
-			_LLU(or->in.total_bytes), or->in.req->data_len);
+			_LLU(or->in.total_bytes), blk_rq_bytes(or->in.req));
 	}
 
 	or->out.pad_buff = sg_out_pad_buffer;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 39b3acf..3d16c70 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -682,14 +682,13 @@ EXPORT_SYMBOL(scsi_release_buffers);
 static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
 {
 	struct request *req = cmd->request;
-	unsigned int dlen = req->data_len;
-	unsigned int next_dlen = req->next_rq->data_len;
 
 	req->resid_len = scsi_out(cmd)->resid;
 	req->next_rq->resid_len = scsi_in(cmd)->resid;
 
 	/* The req and req->next_rq have not been completed */
-	BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
+	BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req),
+				    blk_rq_bytes(req->next_rq)));
 
 	scsi_release_buffers(cmd);
 
@@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
 	BUG_ON(count > sdb->table.nents);
 	sdb->table.nents = count;
 	if (blk_pc_request(req))
-		sdb->length = req->data_len;
+		sdb->length = blk_rq_bytes(req);
 	else
 		sdb->length = blk_rq_sectors(req) << 9;
 	return BLKPREP_OK;
@@ -1087,21 +1086,21 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
 		if (unlikely(ret))
 			return ret;
 	} else {
-		BUG_ON(req->data_len);
+		BUG_ON(blk_rq_bytes(req));
 
 		memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 		req->buffer = NULL;
 	}
 
 	cmd->cmd_len = req->cmd_len;
-	if (!req->data_len)
+	if (!blk_rq_bytes(req))
 		cmd->sc_data_direction = DMA_NONE;
 	else if (rq_data_dir(req) == WRITE)
 		cmd->sc_data_direction = DMA_TO_DEVICE;
 	else
 		cmd->sc_data_direction = DMA_FROM_DEVICE;
 	
-	cmd->transfersize = req->data_len;
+	cmd->transfersize = blk_rq_bytes(req);
 	cmd->allowed = req->retries;
 	return BLKPREP_OK;
 }
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index 48ba413..1030327 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -387,7 +387,7 @@ static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
 	 * we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
 	 * length for us.
 	 */
-	cmd->sdb.length = rq->data_len;
+	cmd->sdb.length = blk_rq_bytes(rq);
 
 	return 0;
 
diff --git a/fs/exofs/osd.c b/fs/exofs/osd.c
index b249ae9..c97420b 100644
--- a/fs/exofs/osd.c
+++ b/fs/exofs/osd.c
@@ -50,10 +50,10 @@ int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
 
 	/* FIXME: should be include in osd_sense_info */
 	if (in_resid)
-		*in_resid = or->in.req ? or->in.req->data_len : 0;
+		*in_resid = or->in.req ? blk_rq_bytes(or->in.req) : 0;
 
 	if (out_resid)
-		*out_resid = or->out.req ? or->out.req->data_len : 0;
+		*out_resid = or->out.req ? blk_rq_bytes(or->out.req) : 0;
 
 	return ret;
 }
-- 
1.6.0.2

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