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Subject[PATCH 05/22] Staging: hv: Get rid of blkvsc_do_read_capacity()
Date
Now that we have a common function for some of the operations on the device,
use that and get rid of the function blkvsc_do_read_capacity().

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
drivers/staging/hv/blkvsc_drv.c | 117 +++++++++++++--------------------------
1 files changed, 39 insertions(+), 78 deletions(-)
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 8094c5e..925b898 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -48,6 +48,7 @@ enum blkvsc_device_type {

enum blkvsc_op_type {
DO_INQUIRY,
+ DO_CAPACITY,
};

/*
@@ -405,6 +406,9 @@ static int blkvsc_do_operation(struct block_device_context *blkdev,
struct page *page_buf;
unsigned char *buf;
unsigned char device_type;
+ struct scsi_sense_hdr sense_hdr;
+ struct vmscsi_request *vm_srb;
+
int ret = 0;

blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
@@ -417,6 +421,7 @@ static int blkvsc_do_operation(struct block_device_context *blkdev,
return -ENOMEM;
}

+ vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
init_completion(&blkvsc_req->request.wait_event);
blkvsc_req->dev = blkdev;
blkvsc_req->req = NULL;
@@ -436,6 +441,15 @@ static int blkvsc_do_operation(struct block_device_context *blkdev,
blkvsc_req->request.data_buffer.len = 64;
break;

+ case DO_CAPACITY:
+ blkdev->sector_size = 0;
+ blkdev->capacity = 0;
+ blkdev->media_not_present = 0; /* assume a disk is present */
+
+ blkvsc_req->cmnd[0] = READ_CAPACITY;
+ blkvsc_req->cmd_len = 16;
+ blkvsc_req->request.data_buffer.len = 8;
+ break;
default:
ret = -EINVAL;
goto cleanup;
@@ -445,6 +459,18 @@ static int blkvsc_do_operation(struct block_device_context *blkdev,

wait_for_completion_interruptible(&blkvsc_req->request.wait_event);

+ /* check error */
+ if (vm_srb->scsi_status) {
+ scsi_normalize_sense(blkvsc_req->sense_buffer,
+ SCSI_SENSE_BUFFERSIZE, &sense_hdr);
+
+ if (sense_hdr.asc == 0x3A)
+ /* Medium not present */
+ blkdev->media_not_present = 1;
+
+ return 0;
+ }
+
buf = kmap(page_buf);

switch (op) {
@@ -464,6 +490,17 @@ static int blkvsc_do_operation(struct block_device_context *blkdev,

memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
break;
+
+ case DO_CAPACITY:
+ /* be to le */
+ blkdev->capacity =
+ ((buf[0] << 24) | (buf[1] << 16) |
+ (buf[2] << 8) | buf[3]) + 1;
+
+ blkdev->sector_size =
+ (buf[4] << 24) | (buf[5] << 16) |
+ (buf[6] << 8) | buf[7];
+ break;
}

cleanup:
@@ -714,82 +751,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
}


-/* Do a scsi READ_CAPACITY cmd here to get the size of the disk */
-static int blkvsc_do_read_capacity(struct block_device_context *blkdev)
-{
- struct blkvsc_request *blkvsc_req;
- struct page *page_buf;
- unsigned char *buf;
- struct scsi_sense_hdr sense_hdr;
- struct vmscsi_request *vm_srb;
-
- DPRINT_DBG(BLKVSC_DRV, "blkvsc_do_read_capacity()\n");
-
- blkdev->sector_size = 0;
- blkdev->capacity = 0;
- blkdev->media_not_present = 0; /* assume a disk is present */
-
- blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
- if (!blkvsc_req)
- return -ENOMEM;
-
- memset(blkvsc_req, 0, sizeof(struct blkvsc_request));
- page_buf = alloc_page(GFP_KERNEL);
- if (!page_buf) {
- kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
- return -ENOMEM;
- }
-
- vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
- init_completion(&blkvsc_req->request.wait_event);
- blkvsc_req->dev = blkdev;
- blkvsc_req->req = NULL;
- blkvsc_req->write = 0;
-
- blkvsc_req->request.data_buffer.pfn_array[0] =
- page_to_pfn(page_buf);
- blkvsc_req->request.data_buffer.offset = 0;
- blkvsc_req->request.data_buffer.len = 8;
-
- blkvsc_req->cmnd[0] = READ_CAPACITY;
- blkvsc_req->cmd_len = 16;
-
- blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
-
- DPRINT_DBG(BLKVSC_DRV, "waiting %p to complete\n",
- blkvsc_req);
-
- wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
-
- /* check error */
- if (vm_srb->scsi_status) {
- scsi_normalize_sense(blkvsc_req->sense_buffer,
- SCSI_SENSE_BUFFERSIZE, &sense_hdr);
-
- if (sense_hdr.asc == 0x3A) {
- /* Medium not present */
- blkdev->media_not_present = 1;
- }
- return 0;
- }
- buf = kmap(page_buf);
-
- /* be to le */
- blkdev->capacity = ((buf[0] << 24) | (buf[1] << 16) |
- (buf[2] << 8) | buf[3]) + 1;
- blkdev->sector_size = (buf[4] << 24) | (buf[5] << 16) |
- (buf[6] << 8) | buf[7];
-
- kunmap(page_buf);
-
- __free_page(page_buf);
-
- kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
-
- return 0;
-}
-
-
static int blkvsc_do_read_capacity16(struct block_device_context *blkdev)
{
struct blkvsc_request *blkvsc_req;
@@ -873,7 +834,7 @@ static int blkvsc_revalidate_disk(struct gendisk *gd)
DPRINT_DBG(BLKVSC_DRV, "- enter\n");

if (blkdev->device_type == DVD_TYPE) {
- blkvsc_do_read_capacity(blkdev);
+ blkvsc_do_operation(blkdev, DO_CAPACITY);
set_capacity(blkdev->gd, blkdev->capacity *
(blkdev->sector_size/512));
blk_queue_logical_block_size(gd->queue, blkdev->sector_size);
@@ -1348,7 +1309,7 @@ static int blkvsc_probe(struct device *device)
if (blkdev->device_type == DVD_TYPE) {
set_disk_ro(blkdev->gd, 1);
blkdev->gd->flags |= GENHD_FL_REMOVABLE;
- blkvsc_do_read_capacity(blkdev);
+ blkvsc_do_operation(blkdev, DO_CAPACITY);
} else {
blkvsc_do_read_capacity16(blkdev);
}
--
1.7.4.1


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