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Date: Thu, 16 Aug 2007 15:13:44 +1000
From: NeilBrown <neilb@...e.de>
To: Jens Axboe <jens.axboe@...cle.com>
Cc: linux-kernel@...r.kernel.org, Tejun Heo <htejun@...il.com>
Subject: [PATCH 003 of 5] Replace bio_cur_sectors with blk_rq_cur_sectors.
All calls to bio_cur_sectors are for the first bio in a 'struct request'.
A future patch will make the discovery of this number dependant on
information in the request. So change the function to take a
'struct request *' instread of a 'struct bio *', and make it a real
function as more code will need to be added.
One place wants the current bytes rather than sectors, so the
'real function' we create is blk_rq_cur_bytes, and
blk_rq_cur_sectors divides this value by 512.
Signed-off-by: Neil Brown <neilb@...e.de>
### Diffstat output
./block/ll_rw_blk.c | 18 ++++++++++++------
./drivers/ide/ide-cd.c | 11 ++++++-----
./drivers/ide/ide-io.c | 2 +-
./include/linux/bio.h | 1 -
./include/linux/blkdev.h | 5 +++++
5 files changed, 24 insertions(+), 13 deletions(-)
diff .prev/block/ll_rw_blk.c ./block/ll_rw_blk.c
--- .prev/block/ll_rw_blk.c 2007-08-16 15:02:30.000000000 +1000
+++ ./block/ll_rw_blk.c 2007-08-16 15:02:30.000000000 +1000
@@ -2904,10 +2904,11 @@ static void init_request_from_bio(struct
req->errors = 0;
req->hard_sector = req->sector = bio->bi_sector;
req->hard_nr_sectors = req->nr_sectors = bio_sectors(bio);
- req->current_nr_sectors = req->hard_cur_sectors = bio_cur_sectors(bio);
+ req->bio = req->biotail = bio;
+ req->current_nr_sectors = req->hard_cur_sectors =
+ blk_rq_cur_sectors(req);
req->nr_phys_segments = bio_phys_segments(req->q, bio);
req->nr_hw_segments = bio_hw_segments(req->q, bio);
- req->bio = req->biotail = bio;
req->buffer = blk_rq_data(req); /* see ->buffer comment above */
req->ioprio = bio_prio(bio);
req->rq_disk = bio->bi_bdev->bd_disk;
@@ -2978,7 +2979,7 @@ static int __make_request(struct request
* not touch req->buffer either...
*/
req->buffer = blk_rq_data(req);
- req->current_nr_sectors = bio_cur_sectors(bio);
+ req->current_nr_sectors = blk_rq_cur_sectors(req);
req->hard_cur_sectors = req->current_nr_sectors;
req->sector = req->hard_sector = bio->bi_sector;
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
@@ -3371,7 +3372,7 @@ static void blk_recalc_rq_sectors(struct
(rq->sector <= rq->hard_sector)) {
rq->sector = rq->hard_sector;
rq->nr_sectors = rq->hard_nr_sectors;
- rq->hard_cur_sectors = bio_cur_sectors(rq->bio);
+ rq->hard_cur_sectors = blk_rq_cur_sectors(rq);
rq->current_nr_sectors = rq->hard_cur_sectors;
rq->buffer = blk_rq_data(rq);
}
@@ -3675,13 +3676,13 @@ void blk_rq_bio_prep(struct request_queu
rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->nr_hw_segments = bio_hw_segments(q, bio);
- rq->current_nr_sectors = bio_cur_sectors(bio);
- rq->hard_cur_sectors = rq->current_nr_sectors;
rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
rq->data_len = bio->bi_size;
rq->bio = rq->biotail = bio;
rq->buffer = blk_rq_data(rq);
+ rq->current_nr_sectors = blk_rq_cur_sectors(rq);
+ rq->hard_cur_sectors = rq->current_nr_sectors;
}
EXPORT_SYMBOL(blk_rq_bio_prep);
@@ -3693,6 +3694,11 @@ void *blk_rq_data(struct request *rq)
}
EXPORT_SYMBOL(blk_rq_data);
+int blk_rq_cur_bytes(struct request *rq)
+{
+ return bio_iovec(rq->bio)->bv_len;
+}
+EXPORT_SYMBOL(blk_rq_cur_bytes);
int kblockd_schedule_work(struct work_struct *work)
{
diff .prev/drivers/ide/ide-cd.c ./drivers/ide/ide-cd.c
--- .prev/drivers/ide/ide-cd.c 2007-08-16 15:02:30.000000000 +1000
+++ ./drivers/ide/ide-cd.c 2007-08-16 15:02:30.000000000 +1000
@@ -1173,7 +1173,8 @@ static ide_startstop_t cdrom_read_intr (
/* First, figure out if we need to bit-bucket
any of the leading sectors. */
- nskip = min_t(int, rq->current_nr_sectors - bio_cur_sectors(rq->bio), sectors_to_transfer);
+ nskip = min_t(int, rq->current_nr_sectors - blk_rq_cur_sectors(rq),
+ sectors_to_transfer);
while (nskip > 0) {
/* We need to throw away a sector. */
@@ -1273,7 +1274,7 @@ static int cdrom_read_from_buffer (ide_d
represent the number of sectors to skip at the start of a transfer
will fail. I think that this will never happen, but let's be
paranoid and check. */
- if (rq->current_nr_sectors < bio_cur_sectors(rq->bio) &&
+ if (rq->current_nr_sectors < blk_rq_cur_sectors(rq) &&
(rq->sector & (sectors_per_frame - 1))) {
printk(KERN_ERR "%s: cdrom_read_from_buffer: buffer botch (%ld)\n",
drive->name, (long)rq->sector);
@@ -1308,7 +1309,7 @@ static ide_startstop_t cdrom_start_read_
nskip = rq->sector & (sectors_per_frame - 1);
if (nskip > 0) {
/* Sanity check... */
- if (rq->current_nr_sectors != bio_cur_sectors(rq->bio) &&
+ if (rq->current_nr_sectors != blk_rq_cur_sectors(rq) &&
(rq->sector & (sectors_per_frame - 1))) {
printk(KERN_ERR "%s: cdrom_start_read_continuation: buffer botch (%u)\n",
drive->name, rq->current_nr_sectors);
@@ -1389,7 +1390,7 @@ static void restore_request (struct requ
rq->nr_sectors += n;
rq->sector -= n;
}
- rq->hard_cur_sectors = rq->current_nr_sectors = bio_cur_sectors(rq->bio);
+ rq->hard_cur_sectors = rq->current_nr_sectors = blk_rq_cur_sectors(rq);
rq->hard_nr_sectors = rq->nr_sectors;
rq->hard_sector = rq->sector;
rq->q->prep_rq_fn(rq->q, rq);
@@ -1770,7 +1771,7 @@ static ide_startstop_t cdrom_newpc_intr(
*/
if (rq->bio) {
ptr = blk_rq_data(rq);
- blen = bio_iovec(rq->bio)->bv_len;
+ blen = blk_rq_cur_bytes(rq);
}
if (!ptr) {
diff .prev/drivers/ide/ide-io.c ./drivers/ide/ide-io.c
--- .prev/drivers/ide/ide-io.c 2007-08-16 15:02:30.000000000 +1000
+++ ./drivers/ide/ide-io.c 2007-08-16 15:02:30.000000000 +1000
@@ -1424,7 +1424,7 @@ static ide_startstop_t ide_dma_timeout_r
goto out;
rq->sector = rq->bio->bi_sector;
- rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
+ rq->current_nr_sectors = blk_rq_cur_sectors(rq);
rq->hard_cur_sectors = rq->current_nr_sectors;
rq->buffer = blk_rq_data(rq);
out:
diff .prev/include/linux/bio.h ./include/linux/bio.h
--- .prev/include/linux/bio.h 2007-08-16 15:02:30.000000000 +1000
+++ ./include/linux/bio.h 2007-08-16 15:02:30.000000000 +1000
@@ -175,7 +175,6 @@ struct bio {
#define bio_offset(bio) bio_iovec((bio))->bv_offset
#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
#define bio_sectors(bio) ((bio)->bi_size >> 9)
-#define bio_cur_sectors(bio) (bio_iovec(bio)->bv_len >> 9)
#define bio_barrier(bio) ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
#define bio_sync(bio) ((bio)->bi_rw & (1 << BIO_RW_SYNC))
#define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
diff .prev/include/linux/blkdev.h ./include/linux/blkdev.h
--- .prev/include/linux/blkdev.h 2007-08-16 15:02:30.000000000 +1000
+++ ./include/linux/blkdev.h 2007-08-16 15:02:30.000000000 +1000
@@ -701,6 +701,11 @@ extern void blk_execute_rq_nowait(struct
struct request *, int, rq_end_io_fn *);
extern int blk_verify_command(unsigned char *, int);
extern void *blk_rq_data(struct request *);
+extern int blk_rq_cur_bytes(struct request *);
+static inline int blk_rq_cur_sectors(struct request *rq)
+{
+ return blk_rq_cur_bytes(rq) >> 9;
+}
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{
-
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