[PATCH UPDATED block#for-2.6.31 2/3] block: set rq->resid_len to blk_rq_bytes() on issue

[Tejun Heo <htejun@gmail.com>]

In commit c3a4d78c580de4edc9ef0f7c59812fb02ceb037f, while introducing
rq->resid_len, the default value of residue count was changed from
full count to zero.  The conversion was done under the assumption that
when a request fails residue count wasn't defined.  However, Boaz and
James pointed out that this wasn't true and the residue count should
be preserved for failed requests too.

This patchset restores the original behavior by setting rq->resid_len
to blk_rq_bytes(rq) on issue and restoring explicit clearing in
affected drivers.  While at it, take advantage of the fact that
rq->resid_len is set to full count where applicable.

* ide-cd: rq->resid_len cleared on pc success

* mptsas: req->resid_len cleared on success

* sas_expander: rsp/req->resid_len cleared on success

* mpt2sas_transport: req->resid_len cleared on success

* ide-cd, ide-tape, mptsas, sas_host_smp, mpt2sas_transport, ub: take
  advantage of initial full count to simplify code

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Darrick J. Wong <djwong@us.ibm.com>
---
ub updated per Pete's comment.

Thanks.

 block/blk-core.c                         |    1 +
 drivers/block/ub.c                       |    6 ++++--
 drivers/ide/ide-cd.c                     |    4 ++--
 drivers/ide/ide-tape.c                   |    2 +-
 drivers/message/fusion/mptsas.c          |    3 ++-
 drivers/scsi/libsas/sas_expander.c       |    4 ++++
 drivers/scsi/libsas/sas_host_smp.c       |    3 ---
 drivers/scsi/mpt2sas/mpt2sas_transport.c |    4 ++--
 8 files changed, 16 insertions(+), 11 deletions(-)

Index: block/block/blk-core.c
===================================================================
--- block.orig/block/blk-core.c
+++ block/block/blk-core.c
@@ -2198,6 +2198,7 @@ void blk_rq_bio_prep(struct request_queu
 		rq->buffer = bio_data(bio);
 	}
 	rq->__data_len = bio->bi_size;
+	rq->resid_len = bio->bi_size;
 	rq->bio = rq->biotail = bio;
 
 	if (bio->bi_bdev)
Index: block/drivers/ide/ide-cd.c
===================================================================
--- block.orig/drivers/ide/ide-cd.c
+++ block/drivers/ide/ide-cd.c
@@ -699,6 +699,7 @@ static ide_startstop_t cdrom_newpc_intr(
 
 out_end:
 	if (blk_pc_request(rq) && rc == 0) {
+		rq->resid_len = 0;
 		blk_end_request_all(rq, 0);
 		hwif->rq = NULL;
 	} else {
@@ -718,8 +719,7 @@ out_end:
 
 		/* make sure it's fully ended */
 		if (blk_fs_request(rq) == 0) {
-			rq->resid_len = blk_rq_bytes(rq) -
-				(cmd->nbytes - cmd->nleft);
+			rq->resid_len -= cmd->nbytes - cmd->nleft;
 			if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
 				rq->resid_len += cmd->last_xfer_len;
 		}
Index: block/drivers/ide/ide-tape.c
===================================================================
--- block.orig/drivers/ide/ide-tape.c
+++ block/drivers/ide/ide-tape.c
@@ -380,7 +380,7 @@ static int ide_tape_callback(ide_drive_t
 		}
 
 		tape->first_frame += blocks;
-		rq->resid_len = blk_rq_bytes(rq) - blocks * tape->blk_size;
+		rq->resid_len -= blocks * tape->blk_size;
 
 		if (pc->error) {
 			uptodate = 0;
Index: block/drivers/message/fusion/mptsas.c
===================================================================
--- block.orig/drivers/message/fusion/mptsas.c
+++ block/drivers/message/fusion/mptsas.c
@@ -1357,7 +1357,8 @@ static int mptsas_smp_handler(struct Scs
 		smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
 		memcpy(req->sense, smprep, sizeof(*smprep));
 		req->sense_len = sizeof(*smprep);
-		rsp->resid_len = blk_rq_bytes(rsp) - smprep->ResponseDataLength;
+		req->resid_len = 0;
+		rsp->resid_len -= smprep->ResponseDataLength;
 	} else {
 		printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
 		    ioc->name, __func__);
Index: block/drivers/scsi/libsas/sas_expander.c
===================================================================
--- block.orig/drivers/scsi/libsas/sas_expander.c
+++ block/drivers/scsi/libsas/sas_expander.c
@@ -1937,7 +1937,11 @@ int sas_smp_handler(struct Scsi_Host *sh
 	if (ret > 0) {
 		/* positive number is the untransferred residual */
 		rsp->resid_len = ret;
+		req->resid_len = 0;
 		ret = 0;
+	} else if (ret == 0) {
+		rsp->resid_len = 0;
+		req->resid_len = 0;
 	}
 
 	return ret;
Index: block/drivers/scsi/libsas/sas_host_smp.c
===================================================================
--- block.orig/drivers/scsi/libsas/sas_host_smp.c
+++ block/drivers/scsi/libsas/sas_host_smp.c
@@ -176,9 +176,6 @@ int sas_smp_host_handler(struct Scsi_Hos
 	resp_data[1] = req_data[1];
 	resp_data[2] = SMP_RESP_FUNC_UNK;
 
-	req->resid_len = blk_rq_bytes(req);
-	rsp->resid_len = blk_rq_bytes(rsp);
-
 	switch (req_data[1]) {
 	case SMP_REPORT_GENERAL:
 		req->resid_len -= 8;
Index: block/drivers/scsi/mpt2sas/mpt2sas_transport.c
===================================================================
--- block.orig/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ block/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1170,8 +1170,8 @@ transport_smp_handler(struct Scsi_Host *
 
 		memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
 		req->sense_len = sizeof(*mpi_reply);
-		rsp->resid_len = blk_rq_bytes(rsp) -
-				 mpi_reply->ResponseDataLength;
+		req->resid_len = 0;
+		rsp->resid_len -= mpi_reply->ResponseDataLength;
 	} else {
 		dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
 		    "%s - no reply\n", ioc->name, __func__));
Index: block/drivers/block/ub.c
===================================================================
--- block.orig/drivers/block/ub.c
+++ block/drivers/block/ub.c
@@ -781,8 +781,10 @@ static void ub_rw_cmd_done(struct ub_dev
 
 	if (cmd->error == 0) {
 		if (blk_pc_request(rq)) {
-			if (cmd->act_len < blk_rq_bytes(rq))
-				rq->resid_len = blk_rq_bytes(rq) - cmd->act_len;
+			if (cmd->act_len >= rq->resid_len)
+				rq->resid_len = 0;
+			else
+				rq->resid_len -= cmd->act_len;
 			scsi_status = 0;
 		} else {
 			if (cmd->act_len != cmd->len) {