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authorTejun Heo <tj@kernel.org>2009-04-19 07:00:42 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-04-28 07:37:30 +0200
commit02e7cf8f848841ca21864ccd019e480b73c323b7 (patch)
treeeb8b88b0b253f7063bfbee063df817fbac6eb60f /drivers/ide/ide-cd.c
parent068753203e6cd085664a62e0fc0636e19b148a12 (diff)
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>
Diffstat (limited to 'drivers/ide/ide-cd.c')
-rw-r--r--drivers/ide/ide-cd.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 061d7bbcd34..673628790f1 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -210,10 +210,12 @@ static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
{
/*
* 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 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
/* 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 @@ end_request:
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 @@ int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
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 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
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);