Re: [PATCH 08/10] block: cleanup rq->data_len usages

Boaz Harrosh
2009-04-30T13:48:51Z

On 04/29/2009 12:13 PM, Tejun Heo wrote:
> With recent unification of fields, it's now guaranteed that
> rq->data_len always equals blk_rq_bytes(). Convert all non-IDE direct
> users to accessors. IDE will be converted in a separate patch.
>
> [ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Pete Zaitcev <zaitcev@redhat.com>
> Cc: Eric Moore <Eric.Moore@lsi.com>
> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
> Cc: Darrick J. Wong <djwong@us.ibm.com>
> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
> Cc: Eric Moore <Eric.Moore@lsi.com>
> Cc: Boaz Harrosh <bharrosh@panasas.com>
> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
> ---
<snip>
> drivers/scsi/osd/osd_initiator.c | 4 ++--
> fs/exofs/osd.c | 4 ++--
<snip>
> diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
> index 2a5f077..d178a8b 100644
> --- a/drivers/scsi/osd/osd_initiator.c
> +++ b/drivers/scsi/osd/osd_initiator.c
> @@ -1299,7 +1299,7 @@ int osd_finalize_request(struct osd_request *or,
> return ret;
> }
> OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n",
> - _LLU(or->out.total_bytes), or->out.req->data_len);
> + _LLU(or->out.total_bytes), blk_rq_bytes(or->out.req));
> }
> if (or->in.bio) {
> ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio);
> @@ -1308,7 +1308,7 @@ int osd_finalize_request(struct osd_request *or,
> return ret;
> }
> OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n",
> - _LLU(or->in.total_bytes), or->in.req->data_len);
> + _LLU(or->in.total_bytes), blk_rq_bytes(or->in.req));
> }
>
> or->out.pad_buff = sg_out_pad_buffer;

Sorry about this stupid debug-print. Leftover from the learning days
Ack for this bit.

> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 39b3acf..3d16c70 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -682,14 +682,13 @@ EXPORT_SYMBOL(scsi_release_buffers);
> static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
> {
> struct request *req = cmd->request;
> - unsigned int dlen = req->data_len;
> - unsigned int next_dlen = req->next_rq->data_len;
>
> req->resid_len = scsi_out(cmd)->resid;
> req->next_rq->resid_len = scsi_in(cmd)->resid;
>
> /* The req and req->next_rq have not been completed */
> - BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
> + BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req),
> + blk_rq_bytes(req->next_rq)));
>

Just blk_end_request_all() actually. If you let blk_end_request_all also do bidi

> scsi_release_buffers(cmd);
>

and then it can be in-lined into caller, where blk_pc_request(req) just do blk_end_request_all
regardless (and only the residual setting is conditional)

I'll send a patch to scsi_lib later once this settles a bit.

> @@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
> BUG_ON(count > sdb->table.nents);
> sdb->table.nents = count;
> if (blk_pc_request(req))
> - sdb->length = req->data_len;
> + sdb->length = blk_rq_bytes(req);
> else
> sdb->length = blk_rq_sectors(req) << 9;

Is this true. I thought they must be the same now. I was actually anticipating this if() removed.

> return BLKPREP_OK;
> @@ -1087,21 +1086,21 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
> if (unlikely(ret))
> return ret;
> } else {
> - BUG_ON(req->data_len);
> + BUG_ON(blk_rq_bytes(req));
>
> memset(&cmd->sdb, 0, sizeof(cmd->sdb));
> req->buffer = NULL;
> }
>
> cmd->cmd_len = req->cmd_len;
> - if (!req->data_len)
> + if (!blk_rq_bytes(req))
> cmd->sc_data_direction = DMA_NONE;
> else if (rq_data_dir(req) == WRITE)
> cmd->sc_data_direction = DMA_TO_DEVICE;
> else
> cmd->sc_data_direction = DMA_FROM_DEVICE;
>
> - cmd->transfersize = req->data_len;
> + cmd->transfersize = blk_rq_bytes(req);
> cmd->allowed = req->retries;
> return BLKPREP_OK;
> }
> diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
> index 48ba413..1030327 100644
> --- a/drivers/scsi/scsi_tgt_lib.c
> +++ b/drivers/scsi/scsi_tgt_lib.c
> @@ -387,7 +387,7 @@ static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
> * we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
> * length for us.
> */
> - cmd->sdb.length = rq->data_len;
> + cmd->sdb.length = blk_rq_bytes(rq);
>
> return 0;
>
> diff --git a/fs/exofs/osd.c b/fs/exofs/osd.c
> index b249ae9..c97420b 100644
> --- a/fs/exofs/osd.c
> +++ b/fs/exofs/osd.c
> @@ -50,10 +50,10 @@ int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
>
> /* FIXME: should be include in osd_sense_info */
> if (in_resid)
> - *in_resid = or->in.req ? or->in.req->data_len : 0;
> + *in_resid = or->in.req ? blk_rq_bytes(or->in.req) : 0;

+ *in_resid = or->in.req ? or->in.req->resid_len : 0;

>
> if (out_resid)
> - *out_resid = or->out.req ? or->out.req->data_len : 0;
> + *out_resid = or->out.req ? blk_rq_bytes(or->out.req) : 0;

+ *out_resid = or->out.req ? or->out.req->resid_len : 0;

>
> return ret;
> }

OK This segment is wrong. It should be moved to the residual count patch
(PATCH 3/10) the assignment into *in_resid/*out_resid should shourly triggered
a warning ;-)

Thanks
Boaz