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Date: Wed, 25 Mar 2009 23:17:47 +0900
From: Tejun Heo <tj@...nel.org>
To: bzolnier@...il.com, linux-kernel@...r.kernel.org, axboe@...nel.dk,
linux-ide@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>
Subject: [PATCH 04/10] ide-tape: use standard data transfer mechanism
Impact: use standard way to transfer data
Now that data area is represented with bio, there is no need to use
custom data transfer methods. Drop idetape_io_buffers() and
idetape_update_buffers(). pc->bh is set to null to tell ide-atapi to
use standard data transfer mechanism and idetape_bh byte counts are
updated by the issuer on completion using the residual count.
Signed-off-by: Tejun Heo <tj@...nel.org>
---
drivers/ide/ide-tape.c | 84 +++--------------------------------------------
1 files changed, 6 insertions(+), 78 deletions(-)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index bd0e839..dd37fd7 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -292,65 +292,6 @@ static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
return tape;
}
-static int idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount)
-{
- struct idetape_bh *bh = pc->bh;
- int count;
-
- if (bcount && bh) {
- count = min(
- (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
- bcount);
- drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
- atomic_read(&bh->b_count), count);
- bcount -= count;
- atomic_add(count, &bh->b_count);
- if (atomic_read(&bh->b_count) == bh->b_size)
- pc->bh = NULL;
- }
-
- return bcount;
-}
-
-static int idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount)
-{
- struct idetape_bh *bh = pc->bh;
- int count;
-
- if (bcount && bh) {
- count = min((unsigned int)pc->b_count, (unsigned int)bcount);
- drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
- bcount -= count;
- pc->b_data += count;
- pc->b_count -= count;
- if (!pc->b_count)
- pc->bh = NULL;
- }
-
- return bcount;
-}
-
-static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
-{
- struct idetape_bh *bh = pc->bh;
- unsigned int bcount = pc->xferred;
-
- if (pc->flags & PC_FLAG_WRITING)
- return;
- if (bcount) {
- if (bh == NULL || bcount > bh->b_size) {
- printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
- __func__);
- return;
- }
- atomic_set(&bh->b_count, bcount);
- if (atomic_read(&bh->b_count) == bh->b_size)
- pc->bh = NULL;
- }
-}
-
/*
* called on each failed packet command retry to analyze the request sense. We
* currently do not utilize this information.
@@ -368,12 +309,10 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
pc->c[0], tape->sense_key, tape->asc, tape->ascq);
/* Correct pc->xferred by asking the tape. */
- if (pc->flags & PC_FLAG_DMA_ERROR) {
+ if (pc->flags & PC_FLAG_DMA_ERROR)
pc->xferred = pc->req_xfer -
tape->blk_size *
get_unaligned_be32(&sense[3]);
- idetape_update_buffers(drive, pc);
- }
/*
* If error was the result of a zero-length read or write command,
@@ -520,19 +459,6 @@ static void ide_tape_handle_dsc(ide_drive_t *drive)
idetape_postpone_request(drive);
}
-static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount, int write)
-{
- unsigned int bleft;
-
- if (write)
- bleft = idetape_output_buffers(drive, pc, bcount);
- else
- bleft = idetape_input_buffers(drive, pc, bcount);
-
- return bcount - bleft;
-}
-
/*
* Packet Command Interface
*
@@ -685,7 +611,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
ide_init_pc(pc);
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
pc->c[1] = 1;
- pc->bh = bh;
+ pc->bh = NULL;
pc->buf = NULL;
pc->buf_size = length * tape->blk_size;
pc->req_xfer = pc->buf_size;
@@ -1083,7 +1009,11 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
blk_execute_rq(drive->queue, tape->disk, rq, 0);
+ /* calculate the number of transferred bytes and update bh */
size -= rq->data_len;
+ if (cmd == REQ_IDETAPE_READ)
+ atomic_add(size, &bh->b_count);
+
ret = size;
if (rq->errors == IDE_DRV_ERROR_GENERAL)
ret = -EIO;
@@ -2037,8 +1967,6 @@ static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
u16 *ctl = (u16 *)&tape->caps[12];
drive->pc_callback = ide_tape_callback;
- drive->pc_update_buffers = idetape_update_buffers;
- drive->pc_io_buffers = ide_tape_io_buffers;
drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
--
1.6.0.2
--
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