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ide-atapi: convert ide-{floppy,tape} to using preallocated sense buffer

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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
drive->request_sense_rq.

tj: * Init request sense ide_atapi_pc from sense request.  In the
      longer timer, it would probably better to fold
      ide_create_request_sense_cmd() into its only current user -
      ide_floppy_get_format_progress().

    * ide_retry_pc() no longer takes @disk.

CC: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Borislav Petkov 2009-04-19 07:00:42 +09:00 committed by Tejun Heo
parent 746d5e4327
commit 6b544fcc8c
4 changed files with 23 additions and 39 deletions
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48
drivers/ide/ide-atapi.c
View file

@ -79,34 +79,6 @@ 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)
{
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) {
rq->data = pc->buf;
rq->data_len = pc->req_xfer;
}
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.
@ -254,18 +226,26 @@ 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.
* 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)
void ide_retry_pc(ide_drive_t *drive)
{
struct request *rq = &drive->request_sense_rq;
struct request *sense_rq = &drive->sense_rq;
struct ide_atapi_pc *pc = &drive->request_sense_pc;
(void)ide_read_error(drive);
ide_create_request_sense_cmd(drive, pc);
/* init pc from sense_rq */
ide_init_pc(pc);
memcpy(pc->c, sense_rq->cmd, 12);
pc->buf = sense_rq->data;
pc->req_xfer = sense_rq->data_len;
if (drive->media == ide_tape)
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
ide_queue_pc_head(drive, disk, pc, rq);
ide_queue_sense_rq(drive, pc);
}
EXPORT_SYMBOL_GPL(ide_retry_pc);
@ -404,7 +384,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
/* Retry operation */
ide_retry_pc(drive, rq->rq_disk);
ide_retry_pc(drive);
/* queued, but not started */
return ide_stopped;

4
drivers/ide/ide-floppy.c
View file

@ -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 +273,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
goto out_end;
}
ide_prep_sense(drive, rq);
memset(&cmd, 0, sizeof(cmd));
if (rq_data_dir(rq))

7
drivers/ide/ide-tape.c
View file

@ -695,7 +695,7 @@ static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
printk(KERN_ERR "ide-tape: %s: I/O error, ",
tape->name);
/* Retry operation */
ide_retry_pc(drive, tape->disk);
ide_retry_pc(drive);
return ide_stopped;
}
pc->error = 0;
@ -752,7 +752,7 @@ 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);
@ -840,6 +840,9 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
BUG();
out:
/* prepare sense request for this command */
ide_prep_sense(drive, rq);
memset(&cmd, 0, sizeof(cmd));
if (rq_data_dir(rq))

3
include/linux/ide.h
View file

@ -604,7 +604,6 @@ struct ide_drive_s {
unsigned long atapi_flags;
struct ide_atapi_pc request_sense_pc;
struct request request_sense_rq;
/* current sense rq and buffer */
bool sense_rq_armed;
@ -1181,7 +1180,7 @@ int ide_do_test_unit_ready(ide_drive_t *, struct gendisk *);
int ide_do_start_stop(ide_drive_t *, struct gendisk *, int);
int ide_set_media_lock(ide_drive_t *, struct gendisk *, int);
void ide_create_request_sense_cmd(ide_drive_t *, struct ide_atapi_pc *);
void ide_retry_pc(ide_drive_t *, struct gendisk *);
void ide_retry_pc(ide_drive_t *drive);
void ide_prep_sense(ide_drive_t *drive, struct request *rq);
void ide_queue_sense_rq(ide_drive_t *drive, void *special);