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Date: Thu, 16 Apr 2009 07:54:00 +0200
From: Borislav Petkov <petkovbb@...glemail.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] ide-atapi: convert ide-{floppy,tape} to using
preallocated sense buffer
Since we're issuing REQ_TYPE_SENSE now we need to allow those types of
rqs in the ->do_request callbacks. As a future improvement, sense_len
assignment might be unified across all ATAPI devices. Borislav to check
with specs and test.
As a result, get rid of ide_queue_pc_head() and the block layer structs.
CC: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC: Tejun Heo <tj@...nel.org>
Signed-off-by: Borislav Petkov <petkovbb@...il.com>
---
drivers/ide/ide-atapi.c | 59 ++++++++++++++--------------------------------
drivers/ide/ide-floppy.c | 19 ++++++++++++++-
drivers/ide/ide-gd.c | 4 +++
drivers/ide/ide-tape.c | 23 +++++++++++++++++-
include/linux/ide.h | 3 --
5 files changed, 62 insertions(+), 46 deletions(-)
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index fa09789..43a2337 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -80,40 +80,6 @@ void ide_init_pc(struct ide_atapi_pc *pc)
EXPORT_SYMBOL_GPL(ide_init_pc);
/*
- * Generate a new packet command request in front of the request queue, before
- * the current request, so that it will be processed immediately, on the next
- * pass through the driver.
- */
-static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
- struct ide_atapi_pc *pc, struct request *rq,
- struct bio *bio, struct bio_vec *bvec,
- unsigned short bvec_len)
-{
- blk_rq_init(NULL, rq);
- rq->cmd_type = REQ_TYPE_SPECIAL;
- rq->cmd_flags |= REQ_PREEMPT;
- rq->special = (char *)pc;
- rq->rq_disk = disk;
-
- if (pc->req_xfer) {
- int error;
-
- error = blk_rq_map_kern_prealloc(drive->queue, rq, bio,
- bvec, bvec_len,
- pc->buf, pc->req_xfer, true);
- BUG_ON(error);
- }
-
- memcpy(rq->cmd, pc->c, 12);
- if (drive->media == ide_tape)
- rq->cmd[13] = REQ_IDETAPE_PC1;
-
- drive->hwif->rq = NULL;
-
- elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
-}
-
-/*
* Add a special packet command request to the tail of the request queue,
* and wait for it to be serviced.
*/
@@ -237,22 +203,29 @@ void ide_queue_sense_rq(ide_drive_t *drive)
EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
/*
- * Called when an error was detected during the last packet command.
- * We queue a request sense packet command in the head of the request list.
+ * Called when an error was detected during the last packet command. We queue a
+ * request sense packet command at the head of the request queue.
*/
void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
{
- struct request *rq = &drive->request_sense_rq;
- struct bio *bio = &drive->request_sense_bio;
- struct bio_vec *bvec = drive->request_sense_bvec;
struct ide_atapi_pc *pc = &drive->request_sense_pc;
- unsigned short bvec_len = ARRAY_SIZE(drive->request_sense_bvec);
(void)ide_read_error(drive);
ide_create_request_sense_cmd(drive, pc);
if (drive->media == ide_tape)
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
- ide_queue_pc_head(drive, disk, pc, rq, bio, bvec, bvec_len);
+
+ drive->sense_rq->special = (char *)pc;
+ drive->sense_rq->rq_disk = disk;
+
+ /* FIXME: sense_len == sizeof(struct request_sense) */
+ memcpy(drive->sense_rq->cmd, pc->c, 12);
+ drive->sense_rq->sense_len = pc->req_xfer;
+
+ if (drive->media == ide_tape)
+ drive->sense_rq->cmd[13] = REQ_IDETAPE_PC1;
+
+ ide_queue_sense_rq(drive);
}
EXPORT_SYMBOL_GPL(ide_retry_pc);
@@ -425,6 +398,10 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
error = uptodate ? 0 : -EIO;
}
+ /* prepare request sense if it got used with the last rq */
+ if (blk_sense_request(rq))
+ drive->sense_rq = NULL;
+
ide_complete_rq(drive, error, done);
return ide_stopped;
}
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 9460033..7d2b219 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -263,7 +263,7 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
}
pc = &floppy->queued_pc;
idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
- } else if (blk_special_request(rq)) {
+ } else if (blk_special_request(rq) || blk_sense_request(rq)) {
pc = (struct ide_atapi_pc *)rq->special;
} else if (blk_pc_request(rq)) {
pc = &floppy->queued_pc;
@@ -273,6 +273,23 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
goto out_end;
}
+ /* prepare request sense if it got used with the last rq */
+ if (!drive->sense_rq) {
+ drive->sense_rq = ide_prep_sense(drive, floppy->disk);
+ if (!drive->sense_rq) {
+ printk(KERN_ERR "%s: error prepping sense request!\n",
+ drive->name);
+ return ide_stopped;
+ }
+ }
+
+ /*
+ * save the current request in case we'll be queueing a sense rq
+ * afterwards due to its potential failure.
+ */
+ if (!blk_sense_request(rq))
+ drive->sense_rq->special = rq;
+
memset(&cmd, 0, sizeof(cmd));
if (rq_data_dir(rq))
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c
index 1aebdf1..811c002 100644
--- a/drivers/ide/ide-gd.c
+++ b/drivers/ide/ide-gd.c
@@ -82,6 +82,10 @@ static void ide_disk_release(struct device *dev)
struct gendisk *g = idkp->disk;
drive->disk_ops = NULL;
+
+ if (drive->sense_rq)
+ blk_put_request(drive->sense_rq);
+
drive->driver_data = NULL;
g->private_data = NULL;
put_disk(g);
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index d52f8b3..e26c9c7 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -758,7 +758,7 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
(unsigned long long)rq->sector, rq->nr_sectors,
rq->current_nr_sectors);
- if (!blk_special_request(rq)) {
+ if (!(blk_special_request(rq) || blk_sense_request(rq))) {
/* We do not support buffer cache originated requests. */
printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
"request queue (%d)\n", drive->name, rq->cmd_type);
@@ -850,6 +850,23 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
BUG();
out:
+ /* prepare request sense if it got used with the last rq */
+ if (!drive->sense_rq) {
+ drive->sense_rq = ide_prep_sense(drive, tape->disk);
+ if (!drive->sense_rq) {
+ printk(KERN_ERR "%s: error prepping sense request!\n",
+ drive->name);
+ return ide_stopped;
+ }
+ }
+
+ /*
+ * save the current request in case we'll be queueing a sense rq
+ * afterwards due to its potential failure.
+ */
+ if (!blk_sense_request(rq))
+ drive->sense_rq->special = rq;
+
if (rq_data_dir(rq))
cmd.tf_flags |= IDE_TFLAG_WRITE;
@@ -2249,6 +2266,10 @@ static void ide_tape_release(struct device *dev)
BUG_ON(tape->merge_bh_size);
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
+
+ if (drive->sense_rq)
+ blk_put_request(drive->sense_rq);
+
drive->driver_data = NULL;
device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
device_destroy(idetape_sysfs_class,
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 095cda2..2238e61 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -605,9 +605,6 @@ struct ide_drive_s {
/* for request sense */
struct ide_atapi_pc request_sense_pc;
- struct request request_sense_rq;
- struct bio request_sense_bio;
- struct bio_vec request_sense_bvec[2];
/* current sense rq and buffer */
struct request *sense_rq;
--
1.6.2.2
--
Regards/Gruss,
Boris.
--
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