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Date: Mon, 28 Mar 2011 09:33:31 -0700
From: "K. Y. Srinivasan" <kys@...rosoft.com>
To: gregkh@...e.de, linux-kernel@...r.kernel.org,
devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Abhishek Kane <v-abkane@...rosoft.com>,
Hank Janssen <hjanssen@...rosoft.com>
Subject: [PATCH 06/20] Staging: hv: Get rid of the type field from struct hv_storvsc_request
In preparation for consolidating all I/O request state, get rid of the
type field from struct hv_storvsc_request and instead use the
equivalent state in struct vmscsi_request - data_in field.
In the current code there is a call to zero out the struct vstor_packet in
stor_vsc_on_io_request(). So, to be able to directly set the state in the
vstor_packet in blkvsc_drv.c and storvsc_drv.c, get rid of the call to
zero out the packet in stor_vsc_on_io_request() and instead allocate the
request structure that has been zeroed out.
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: Abhishek Kane <v-abkane@...rosoft.com>
Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
---
drivers/staging/hv/blkvsc_drv.c | 18 +++++++++++-------
drivers/staging/hv/storvsc.c | 3 ---
drivers/staging/hv/storvsc_api.h | 1 -
drivers/staging/hv/storvsc_drv.c | 8 +++++---
4 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 1e5320e..00bc226 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -510,7 +510,7 @@ static int blkvsc_do_flush(struct block_device_context *blkdev)
if (blkdev->device_type != HARDDISK_TYPE)
return 0;
- blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
+ blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
if (!blkvsc_req)
return -ENOMEM;
@@ -551,7 +551,7 @@ static int blkvsc_do_inquiry(struct block_device_context *blkdev)
DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_inquiry()\n");
- blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
+ blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
if (!blkvsc_req)
return -ENOMEM;
@@ -638,7 +638,7 @@ static int blkvsc_do_read_capacity(struct block_device_context *blkdev)
blkdev->capacity = 0;
blkdev->media_not_present = 0; /* assume a disk is present */
- blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
+ blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
if (!blkvsc_req)
return -ENOMEM;
@@ -715,7 +715,7 @@ static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
blkdev->capacity = 0;
blkdev->media_not_present = 0; /* assume a disk is present */
- blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_KERNEL);
+ blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
if (!blkvsc_req)
return -ENOMEM;
@@ -913,6 +913,7 @@ static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
struct storvsc_driver_object *storvsc_drv_obj =
drv->priv;
struct hv_storvsc_request *storvsc_req;
+ struct vmscsi_request *vm_srb;
int ret;
DPRINT_DBG(BLKVSC_DRV, "blkvsc_submit_request() - "
@@ -933,8 +934,9 @@ static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
#endif
storvsc_req = &blkvsc_req->request;
+ vm_srb = &storvsc_req->extension.vstor_packet.vm_srb;
- storvsc_req->type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
+ vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
storvsc_req->on_io_completion = request_completion;
storvsc_req->context = blkvsc_req;
@@ -983,7 +985,7 @@ static int blkvsc_do_request(struct block_device_context *blkdev,
(unsigned long)blk_rq_pos(req));
/* Create a group to tie req to list of blkvsc_reqs */
- group = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
+ group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC);
if (!group)
return -ENOMEM;
@@ -1026,7 +1028,9 @@ static int blkvsc_do_request(struct block_device_context *blkdev,
* Create new blkvsc_req to represent
* the current bvec
*/
- blkvsc_req = kmem_cache_alloc(blkdev->request_pool, GFP_ATOMIC);
+ blkvsc_req =
+ kmem_cache_zalloc(
+ blkdev->request_pool, GFP_ATOMIC);
if (!blkvsc_req) {
/* free up everything */
list_for_each_entry_safe(
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 8dc17b9..b580c30 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -545,8 +545,6 @@ int stor_vsc_on_io_request(struct hv_device *device,
request_extension->request = request;
request_extension->device = device;
- memset(vstor_packet, 0 , sizeof(struct vstor_packet));
-
vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
@@ -562,7 +560,6 @@ int stor_vsc_on_io_request(struct hv_device *device,
vstor_packet->vm_srb.cdb_length = request->cdb_len;
memcpy(&vstor_packet->vm_srb.cdb, request->cdb, request->cdb_len);
- vstor_packet->vm_srb.data_in = request->type;
vstor_packet->vm_srb.data_transfer_length = request->data_buffer.len;
vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index cdef1c7..27781f4 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -66,7 +66,6 @@ struct storvsc_request_extension {
};
struct hv_storvsc_request {
- enum storvsc_request_type type;
u32 host;
u32 bus;
u32 target_id;
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index c2a3a5b..b08423b 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -709,6 +709,7 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
int i;
struct scatterlist *sgl;
unsigned int sg_count = 0;
+ struct vmscsi_request *vm_srb;
DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d "
"queue depth %d tagged %d", scmnd, scmnd->sc_data_direction,
@@ -752,19 +753,20 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
scmnd->host_scribble = (unsigned char *)cmd_request;
request = &cmd_request->request;
+ vm_srb = &request->extension.vstor_packet.vm_srb;
DPRINT_DBG(STORVSC_DRV, "req %p size %d", request, request_size);
/* Build the SRB */
switch (scmnd->sc_data_direction) {
case DMA_TO_DEVICE:
- request->type = WRITE_TYPE;
+ vm_srb->data_in = WRITE_TYPE;
break;
case DMA_FROM_DEVICE:
- request->type = READ_TYPE;
+ vm_srb->data_in = READ_TYPE;
break;
default:
- request->type = UNKNOWN_TYPE;
+ vm_srb->data_in = UNKNOWN_TYPE;
break;
}
--
1.7.4.1
--
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