FUJITA Tomonori wrote:
> From: Boaz Harrosh <[EMAIL PROTECTED]>
> Subject: [RFC 7/8] sd.c and sr.c move to scsi_sgtable implementation
> Date: Thu, 05 Jul 2007 16:44:04 +0300
>
>> - sd and sr would adjust IO size to align on device's block
>> size. So code needs to change once we move to scsi_sgtable
>> implementation. (Not compatible with un-converted drivers)
>> - Convert code to use scsi_for_each_sg
>> - Use Data accessors wherever is appropriate.
>>
>> Signed-off-by: Boaz Harrosh <[EMAIL PROTECTED]>
>> ---
>> drivers/scsi/sd.c | 10 ++++------
>> drivers/scsi/sr.c | 27 ++++++++++++---------------
>> 2 files changed, 16 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
>> index 448d316..459fd23 100644
>> --- a/drivers/scsi/sd.c
>> +++ b/drivers/scsi/sd.c
>> @@ -338,7 +338,7 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
>> struct request *rq = SCpnt->request;
>> struct gendisk *disk = rq->rq_disk;
>> sector_t block = rq->sector;
>> - unsigned int this_count = SCpnt->request_bufflen >> 9;
>> + unsigned int this_count = scsi_bufflen(SCpnt) >> 9;
>> unsigned int timeout = sdp->timeout;
>>
>> SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
>> @@ -418,9 +418,6 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
>> } else if (rq_data_dir(rq) == READ) {
>> SCpnt->cmnd[0] = READ_6;
>> SCpnt->sc_data_direction = DMA_FROM_DEVICE;
>> - } else {
>> - scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n",
>> rq->cmd_flags);
>> - return 0;
>> }
>
> Why?
This seems to be dead code as rq_data_dir can only be either READ or WRITE.
The else case could be a BUG() but I don't see why it should be handled
gracefully.
>
>
>> SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
>> @@ -480,7 +477,8 @@ static int sd_init_command(struct scsi_cmnd * SCpnt)
>> SCpnt->cmnd[4] = (unsigned char) this_count;
>> SCpnt->cmnd[5] = 0;
>> }
>> - SCpnt->request_bufflen = this_count * sdp->sector_size;
>> + BUG_ON(!SCpnt->sgtable);
>> + SCpnt->sgtable->length = this_count * sdp->sector_size;
>>
>> /*
>> * We shouldn't disconnect in the middle of a sector, so with a dumb
>> @@ -892,7 +890,7 @@ static struct block_device_operations sd_fops = {
>> static void sd_rw_intr(struct scsi_cmnd * SCpnt)
>> {
>> int result = SCpnt->result;
>> - unsigned int xfer_size = SCpnt->request_bufflen;
>> + unsigned int xfer_size = scsi_bufflen(SCpnt);
>> unsigned int good_bytes = result ? 0 : xfer_size;
>> u64 start_lba = SCpnt->request->sector;
>> u64 bad_lba;
>> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
>> index f9a52af..ed61ca9 100644
>> --- a/drivers/scsi/sr.c
>> +++ b/drivers/scsi/sr.c
>> @@ -218,7 +218,7 @@ int sr_media_change(struct cdrom_device_info *cdi, int
>> slot)
>> static void rw_intr(struct scsi_cmnd * SCpnt)
>> {
>> int result = SCpnt->result;
>> - int this_count = SCpnt->request_bufflen;
>> + int this_count = scsi_bufflen(SCpnt);
>> int good_bytes = (result == 0 ? this_count : 0);
>> int block_sectors = 0;
>> long error_sector;
>> @@ -345,23 +345,20 @@ static int sr_init_command(struct scsi_cmnd * SCpnt)
>> } else if (rq_data_dir(SCpnt->request) == READ) {
>> SCpnt->cmnd[0] = READ_10;
>> SCpnt->sc_data_direction = DMA_FROM_DEVICE;
>> - } else {
>> - blk_dump_rq_flags(SCpnt->request, "Unknown sr command");
>> - return 0;
>> }
>
> ditto.
ditto :)
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