linux-kernel - [PATCH 06/32] xen blkback: prepare for bi

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Message-Id: <1446674909-5371-7-git-send-email-mchristi@redhat.com>
Date:	Wed,  4 Nov 2015 16:08:03 -0600
From:	mchristi@...hat.com
To:	linux-fsdevel@...r.kernel.org, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, drbd-dev@...ts.linbit.com
Cc:	Mike Christie <mchristi@...hat.com>
Subject: [PATCH 06/32] xen blkback: prepare for bi_rw split

From: Mike Christie <mchristi@...hat.com>

This patch prepares xen blkback submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
modify the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@...hat.com>
---
 drivers/block/xen-blkback/blkback.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 6a685ae..bfffab3 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -488,7 +488,7 @@ static int xen_vbd_translate(struct phys_req *req, struct xen_blkif *blkif,
 	struct xen_vbd *vbd = &blkif->vbd;
 	int rc = -EACCES;
 
-	if ((operation != READ) && vbd->readonly)
+	if ((operation != REQ_OP_READ) && vbd->readonly)
 		goto out;
 
 	if (likely(req->nr_sects)) {
@@ -990,7 +990,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
 	preq.sector_number = req->u.discard.sector_number;
 	preq.nr_sects      = req->u.discard.nr_sectors;
 
-	err = xen_vbd_translate(&preq, blkif, WRITE);
+	err = xen_vbd_translate(&preq, blkif, REQ_OP_WRITE);
 	if (err) {
 		pr_warn("access denied: DISCARD [%llu->%llu] on dev=%04x\n",
 			preq.sector_number,
@@ -1203,6 +1203,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	struct bio **biolist = pending_req->biolist;
 	int i, nbio = 0;
 	int operation;
+	int operation_flags = 0;
 	struct blk_plug plug;
 	bool drain = false;
 	struct grant_page **pages = pending_req->segments;
@@ -1220,17 +1221,19 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	switch (req_operation) {
 	case BLKIF_OP_READ:
 		blkif->st_rd_req++;
-		operation = READ;
+		operation = REQ_OP_READ;
 		break;
 	case BLKIF_OP_WRITE:
 		blkif->st_wr_req++;
-		operation = WRITE_ODIRECT;
+		operation = REQ_OP_WRITE;
+		operation_flags = WRITE_ODIRECT;
 		break;
 	case BLKIF_OP_WRITE_BARRIER:
 		drain = true;
 	case BLKIF_OP_FLUSH_DISKCACHE:
 		blkif->st_f_req++;
-		operation = WRITE_FLUSH;
+		operation = REQ_OP_WRITE;
+		operation_flags = WRITE_FLUSH;
 		break;
 	default:
 		operation = 0; /* make gcc happy */
@@ -1242,7 +1245,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	nseg = req->operation == BLKIF_OP_INDIRECT ?
 	       req->u.indirect.nr_segments : req->u.rw.nr_segments;
 
-	if (unlikely(nseg == 0 && operation != WRITE_FLUSH) ||
+	if (unlikely(nseg == 0 && operation_flags != WRITE_FLUSH) ||
 	    unlikely((req->operation != BLKIF_OP_INDIRECT) &&
 		     (nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) ||
 	    unlikely((req->operation == BLKIF_OP_INDIRECT) &&
@@ -1349,7 +1352,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 
 	/* This will be hit if the operation was a flush or discard. */
 	if (!bio) {
-		BUG_ON(operation != WRITE_FLUSH);
+		BUG_ON(operation_flags != WRITE_FLUSH);
 
 		bio = bio_alloc(GFP_KERNEL, 0);
 		if (unlikely(bio == NULL))
@@ -1365,14 +1368,14 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	blk_start_plug(&plug);
 
 	for (i = 0; i < nbio; i++)
-		submit_bio(operation, biolist[i]);
+		submit_bio(operation | operation_flags, biolist[i]);
 
 	/* Let the I/Os go.. */
 	blk_finish_plug(&plug);
 
-	if (operation == READ)
+	if (operation == REQ_OP_READ)
 		blkif->st_rd_sect += preq.nr_sects;
-	else if (operation & WRITE)
+	else if (operation == REQ_OP_WRITE)
 		blkif->st_wr_sect += preq.nr_sects;
 
 	return 0;
-- 
1.8.3.1

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