From 2038e214867032b9dc6ef0546b4b5ed99c8375f6 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Fri, 22 Apr 2011 14:55:09 -0700 Subject: [PATCH] Staging: hv: Get rid of blkvsc_do_read_capacity() 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 Signed-off-by: Haiyang Zhang Signed-off-by: Hank Janssen Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/blkvsc_drv.c | 117 +++++++++++--------------------- 1 file changed, 39 insertions(+), 78 deletions(-) diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c index 9dbba3c82594..b2d149d3b137 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, }; /* @@ -406,6 +407,9 @@ 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); @@ -418,6 +422,7 @@ 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; @@ -437,6 +442,15 @@ 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; @@ -446,6 +460,18 @@ 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) { @@ -465,6 +491,17 @@ 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: @@ -715,82 +752,6 @@ 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; @@ -874,7 +835,7 @@ 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); @@ -1350,7 +1311,7 @@ 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); } -- 2.20.1