Re: [PATCH 08/18] block: Make scsi_req_init() calls implicit

2017-05-21 Thread Christoph Hellwig
On Fri, May 19, 2017 at 11:30:06AM -0700, Bart Van Assche wrote:
> Instead of explicitly calling scsi_req_init(), let
> blk_get_request() call that function from inside blk_rq_init().
> Add an .initialize_rq_fn() callback function to the block drivers
> that need it.

Thanks Bart,

this looks like a very nice cleanup.

> Merge the IDE .init_rq_fn() function into
> .initialize_rq_fn() because it is too small to keep it as a
> separate function.

Although we can't do this IFF we don't call .initialize_rq_fn from
the fast path (which I think we should).


[PATCH 08/18] block: Make scsi_req_init() calls implicit

2017-05-19 Thread Bart Van Assche
Instead of explicitly calling scsi_req_init(), let
blk_get_request() call that function from inside blk_rq_init().
Add an .initialize_rq_fn() callback function to the block drivers
that need it. Merge the IDE .init_rq_fn() function into
.initialize_rq_fn() because it is too small to keep it as a
separate function.

References: commit 82ed4db499b8 ("block: split scsi_request out of struct 
request")
Signed-off-by: Bart Van Assche 
Cc: Jens Axboe 
Cc: Christoph Hellwig 
Cc: Omar Sandoval 
Cc: Hannes Reinecke 
Cc: linux-bl...@vger.kernel.org
---
 block/bsg.c|  1 -
 block/scsi_ioctl.c |  3 ---
 drivers/block/pktcdvd.c|  1 -
 drivers/cdrom/cdrom.c  |  1 -
 drivers/ide/ide-atapi.c|  2 --
 drivers/ide/ide-cd.c   |  1 -
 drivers/ide/ide-cd_ioctl.c |  1 -
 drivers/ide/ide-devsets.c  |  1 -
 drivers/ide/ide-disk.c |  1 -
 drivers/ide/ide-ioctls.c   |  2 --
 drivers/ide/ide-park.c |  2 --
 drivers/ide/ide-pm.c   |  2 --
 drivers/ide/ide-probe.c|  6 +++---
 drivers/ide/ide-tape.c |  1 -
 drivers/ide/ide-taskfile.c |  1 -
 drivers/scsi/osd/osd_initiator.c   |  2 --
 drivers/scsi/osst.c|  1 -
 drivers/scsi/scsi_error.c  |  1 -
 drivers/scsi/scsi_lib.c| 10 +-
 drivers/scsi/scsi_transport_sas.c  |  6 ++
 drivers/scsi/sg.c  |  2 --
 drivers/scsi/st.c  |  1 -
 drivers/target/target_core_pscsi.c |  2 --
 fs/nfsd/blocklayout.c  |  1 -
 24 files changed, 18 insertions(+), 34 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index 5ccecc9855ac..0fe9b584fde0 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -236,7 +236,6 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, 
fmode_t has_write_perm)
rq = blk_get_request(q, op, GFP_KERNEL);
if (IS_ERR(rq))
return rq;
-   scsi_req_init(rq);
 
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm);
if (ret)
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 4a294a5f7fab..f96c51f5df40 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -326,7 +326,6 @@ static int sg_io(struct request_queue *q, struct gendisk 
*bd_disk,
if (IS_ERR(rq))
return PTR_ERR(rq);
req = scsi_req(rq);
-   scsi_req_init(rq);
 
if (hdr->cmd_len > BLK_MAX_CDB) {
req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
@@ -456,7 +455,6 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk 
*disk, fmode_t mode,
goto error_free_buffer;
}
req = scsi_req(rq);
-   scsi_req_init(rq);
 
cmdlen = COMMAND_SIZE(opcode);
 
@@ -542,7 +540,6 @@ static int __blk_send_generic(struct request_queue *q, 
struct gendisk *bd_disk,
rq = blk_get_request(q, REQ_OP_SCSI_OUT, __GFP_RECLAIM);
if (IS_ERR(rq))
return PTR_ERR(rq);
-   scsi_req_init(rq);
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
scsi_req(rq)->cmd[0] = cmd;
scsi_req(rq)->cmd[4] = data;
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 4134bb54f6ad..12dc1f334420 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -707,7 +707,6 @@ static int pkt_generic_packet(struct pktcdvd_device *pd, 
struct packet_command *
 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, __GFP_RECLAIM);
if (IS_ERR(rq))
return PTR_ERR(rq);
-   scsi_req_init(rq);
 
if (cgc->buflen) {
ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index dc20e4368136..547157b8fa1f 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2200,7 +2200,6 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info 
*cdi, __u8 __user *ubuf,
break;
}
req = scsi_req(rq);
-   scsi_req_init(rq);
 
ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
if (ret) {
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 5901937284e7..7edebe0fb1eb 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -93,7 +93,6 @@ int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk 
*disk,
int error;
 
rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
-   scsi_req_init(rq);
ide_req(rq)->type = ATA_PRIV_MISC;
rq->special = (char *)pc;
 
@@ -200,7 +199,6 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
memset(sense, 0, sizeof(*sense));
 
blk_rq_init(rq->q, sense_rq);
-   scsi_req_init(sense_rq);
 
err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,