ide-cd,atapi: use bio for internal commands
Impact: unify request data buffer handling
rq->data is used mostly to pass kernel buffer through request queue
without using bio. There are only a couple of places which still do
this in kernel and converting to bio isn't difficult.
This patch converts ide-cd and atapi to use bio instead of rq->data
for request sense and internal pc commands. With previous change to
unify sense request handling, this is relatively easily achieved by
adding blk_rq_map_kern() during sense_rq prep and PC issue.
If blk_rq_map_kern() fails for sense, the error is deferred till sense
issue and aborts the failed command which triggered the sense. Note
that this is a slim possibility as sense prep is done on each command
issue, so for the above condition to actually trigger, all preps since
the last sense issue till the issue of the request which would require
a sense should fail.
* do_request functions might sleep now. This should be okay as ide
request_fn - do_ide_request() - is invoked only from make_request
and plug work. Make sure this is the case by adding might_sleep()
to do_ide_request().
* Functions which access the read sense data before the sense request
is complete now should access bio_data(sense_rq->bio) as the sense
buffer might have been copied during blk_rq_map_kern().
* ide-tape updated to map sg.
* cdrom_do_block_pc() now doesn't have to deal with REQ_TYPE_ATA_PC
special case. Simplified.
* tp_ops->output/input_data path dropped from ide_pc_intr().
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 972c522..5cefe12 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -94,16 +94,18 @@
rq->special = (char *)pc;
if (pc->req_xfer) {
- rq->data = pc->buf;
- rq->data_len = pc->req_xfer;
+ error = blk_rq_map_kern(drive->queue, rq, pc->buf, pc->req_xfer,
+ GFP_NOIO);
+ if (error)
+ goto put_req;
}
memcpy(rq->cmd, pc->c, 12);
if (drive->media == ide_tape)
rq->cmd[13] = REQ_IDETAPE_PC1;
error = blk_execute_rq(drive->queue, disk, rq, 0);
+put_req:
blk_put_request(rq);
-
return error;
}
EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
@@ -168,6 +170,7 @@
struct request_sense *sense = &drive->sense_data;
struct request *sense_rq = &drive->sense_rq;
unsigned int cmd_len, sense_len;
+ int err;
debug_log("%s: enter\n", __func__);
@@ -193,13 +196,19 @@
memset(sense, 0, sizeof(*sense));
blk_rq_init(rq->q, sense_rq);
- sense_rq->rq_disk = rq->rq_disk;
- sense_rq->data = sense;
+ err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
+ GFP_NOIO);
+ if (unlikely(err)) {
+ if (printk_ratelimit())
+ printk(KERN_WARNING "%s: failed to map sense buffer\n",
+ drive->name);
+ return;
+ }
+
+ sense_rq->rq_disk = rq->rq_disk;
sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
sense_rq->cmd[4] = cmd_len;
- sense_rq->data_len = sense_len;
-
sense_rq->cmd_type = REQ_TYPE_SENSE;
sense_rq->cmd_flags |= REQ_PREEMPT;
@@ -210,9 +219,14 @@
}
EXPORT_SYMBOL_GPL(ide_prep_sense);
-void ide_queue_sense_rq(ide_drive_t *drive, void *special)
+int ide_queue_sense_rq(ide_drive_t *drive, void *special)
{
- BUG_ON(!drive->sense_rq_armed);
+ /* deferred failure from ide_prep_sense() */
+ if (!drive->sense_rq_armed) {
+ printk(KERN_WARNING "%s: failed queue sense request\n",
+ drive->name);
+ return -ENOMEM;
+ }
drive->sense_rq.special = special;
drive->sense_rq_armed = false;
@@ -221,6 +235,7 @@
elv_add_request(drive->queue, &drive->sense_rq,
ELEVATOR_INSERT_FRONT, 0);
+ return 0;
}
EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
@@ -239,13 +254,14 @@
/* init pc from sense_rq */
ide_init_pc(pc);
memcpy(pc->c, sense_rq->cmd, 12);
- pc->buf = sense_rq->data;
+ pc->buf = bio_data(sense_rq->bio); /* pointer to mapped address */
pc->req_xfer = sense_rq->data_len;
if (drive->media == ide_tape)
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
- ide_queue_sense_rq(drive, pc);
+ if (ide_queue_sense_rq(drive, pc))
+ ide_complete_rq(drive, -EIO, blk_rq_bytes(drive->hwif->rq));
}
EXPORT_SYMBOL_GPL(ide_retry_pc);
@@ -317,7 +333,6 @@
struct ide_cmd *cmd = &hwif->cmd;
struct request *rq = hwif->rq;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
- xfer_func_t *xferfunc;
unsigned int timeout, done;
u16 bcount;
u8 stat, ireason, dsc = 0;
@@ -411,7 +426,7 @@
rq->errors = -EIO;
}
- if (drive->media == ide_tape)
+ if (drive->media == ide_tape && !rq->bio)
done = ide_rq_bytes(rq); /* FIXME */
else
done = blk_rq_bytes(rq);
@@ -448,16 +463,11 @@
return ide_do_reset(drive);
}
- xferfunc = write ? tp_ops->output_data : tp_ops->input_data;
-
- if (drive->media == ide_floppy && pc->buf == NULL) {
+ if (drive->media == ide_tape && pc->bh)
+ done = drive->pc_io_buffers(drive, pc, bcount, write);
+ else {
done = min_t(unsigned int, bcount, cmd->nleft);
ide_pio_bytes(drive, cmd, write, done);
- } else if (drive->media == ide_tape && pc->bh) {
- done = drive->pc_io_buffers(drive, pc, bcount, write);
- } else {
- done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred);
- xferfunc(drive, NULL, pc->cur_pos, done);
}
/* Update the current position */
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 7b21c7e..392a5bd 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -210,10 +210,12 @@
{
/*
* For REQ_TYPE_SENSE, "rq->special" points to the original
- * failed request
+ * failed request. Also, the sense data should be read
+ * directly from rq which might be different from the original
+ * sense buffer if it got copied during mapping.
*/
struct request *failed = (struct request *)rq->special;
- struct request_sense *sense = &drive->sense_data;
+ void *sense = bio_data(rq->bio);
if (failed) {
if (failed->sense) {
@@ -398,7 +400,7 @@
/* if we got a CHECK_CONDITION status, queue a request sense command */
if (stat & ATA_ERR)
- ide_queue_sense_rq(drive, NULL);
+ return ide_queue_sense_rq(drive, NULL) ? 2 : 1;
return 1;
end_request:
@@ -412,8 +414,7 @@
hwif->rq = NULL;
- ide_queue_sense_rq(drive, rq);
- return 1;
+ return ide_queue_sense_rq(drive, rq) ? 2 : 1;
} else
return 2;
}
@@ -507,8 +508,12 @@
rq->cmd_flags |= cmd_flags;
rq->timeout = timeout;
if (buffer) {
- rq->data = buffer;
- rq->data_len = *bufflen;
+ error = blk_rq_map_kern(drive->queue, rq, buffer,
+ *bufflen, GFP_NOIO);
+ if (error) {
+ blk_put_request(rq);
+ return error;
+ }
}
error = blk_execute_rq(drive->queue, info->disk, rq, 0);
@@ -802,15 +807,10 @@
drive->dma = 0;
/* sg request */
- if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
+ if (rq->bio) {
struct request_queue *q = drive->queue;
+ char *buf = bio_data(rq->bio);
unsigned int alignment;
- char *buf;
-
- if (rq->bio)
- buf = bio_data(rq->bio);
- else
- buf = rq->data;
drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 9b9e8b1..3245c2d 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -481,6 +481,9 @@
spin_unlock_irq(q->queue_lock);
+ /* HLD do_request() callback might sleep, make sure it's okay */
+ might_sleep();
+
if (ide_lock_host(host, hwif))
goto plug_device_2;
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 8324dfa..9b762a2 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -850,6 +850,9 @@
cmd.rq = rq;
+ ide_init_sg_cmd(&cmd, pc->req_xfer);
+ ide_map_sg(drive, &cmd);
+
return ide_tape_issue_pc(drive, &cmd, pc);
}
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 9e67cca..1957461 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1183,7 +1183,7 @@
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);
+int ide_queue_sense_rq(ide_drive_t *drive, void *special);
int ide_cd_expiry(ide_drive_t *);