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Subject[PATCH 3.10 070/268] scsi: storvsc: properly set residual data length on errors
Date
From: Long Li <longli@microsoft.com>

commit 40630f462824ee24bc00d692865c86c3828094e0 upstream.

On I/O errors, the Windows driver doesn't set data_transfer_length
on error conditions other than SRB_STATUS_DATA_OVERRUN.
In these cases we need to set data_transfer_length to 0,
indicating there is no data transferred. On SRB_STATUS_DATA_OVERRUN,
data_transfer_length is set by the Windows driver to the actual data transferred.

Reported-by: Shiva Krishna <Shiva.Krishna@nimblestorage.com>
Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
drivers/scsi/storvsc_drv.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 2729023..58d898c 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -204,6 +204,7 @@ enum storvsc_request_type {
#define SRB_STATUS_SUCCESS 0x01
#define SRB_STATUS_ABORTED 0x02
#define SRB_STATUS_ERROR 0x04
+#define SRB_STATUS_DATA_OVERRUN 0x12

/*
* This is the end of Protocol specific defines.
@@ -866,6 +867,7 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
struct scsi_sense_hdr sense_hdr;
struct vmscsi_request *vm_srb;
struct stor_mem_pools *memp = scmnd->device->hostdata;
+ u32 data_transfer_length;
struct Scsi_Host *host;
struct storvsc_device *stor_dev;
struct hv_device *dev = host_dev->dev;
@@ -874,6 +876,7 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
host = stor_dev->host;

vm_srb = &cmd_request->vstor_packet.vm_srb;
+ data_transfer_length = vm_srb->data_transfer_length;
if (cmd_request->bounce_sgl_count) {
if (vm_srb->data_in == READ_TYPE)
copy_from_bounce_buffer(scsi_sglist(scmnd),
@@ -892,13 +895,20 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
scsi_print_sense_hdr("storvsc", &sense_hdr);
}

- if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
+ if (vm_srb->srb_status != SRB_STATUS_SUCCESS) {
storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
sense_hdr.ascq);
+ /*
+ * The Windows driver set data_transfer_length on
+ * SRB_STATUS_DATA_OVERRUN. On other errors, this value
+ * is untouched. In these cases we set it to 0.
+ */
+ if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN)
+ data_transfer_length = 0;
+ }

scsi_set_resid(scmnd,
- cmd_request->data_buffer.len -
- vm_srb->data_transfer_length);
+ cmd_request->data_buffer.len - data_transfer_length);

scsi_done_fn = scmnd->scsi_done;

--
2.8.0.rc2.1.gbe9624a
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