[PATCH 16/27] raid5: use bio_reset()

From: Kent Overstreet
Date: Tue Feb 19 2013 - 19:27:08 EST


Had to shuffle the code around a bit (where bi_rw and bi_end_io were
set), but shouldn't really be anything tricky here

Signed-off-by: Kent Overstreet <koverstreet@xxxxxxxxxx>
CC: Jens Axboe <axboe@xxxxxxxxx>
CC: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid5.c | 27 +++++++++++++--------------
1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 0ba12c3..b1b2188 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -568,14 +568,6 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
bi = &sh->dev[i].req;
rbi = &sh->dev[i].rreq; /* For writing to replacement */

- bi->bi_rw = rw;
- rbi->bi_rw = rw;
- if (rw & WRITE) {
- bi->bi_end_io = raid5_end_write_request;
- rbi->bi_end_io = raid5_end_write_request;
- } else
- bi->bi_end_io = raid5_end_read_request;
-
rcu_read_lock();
rrdev = rcu_dereference(conf->disks[i].replacement);
smp_mb(); /* Ensure that if rrdev is NULL, rdev won't be */
@@ -650,7 +642,14 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)

set_bit(STRIPE_IO_STARTED, &sh->state);

+ bio_reset(bi);
bi->bi_bdev = rdev->bdev;
+ bi->bi_rw = rw;
+ bi->bi_end_io = (rw & WRITE)
+ ? raid5_end_write_request
+ : raid5_end_read_request;
+ bi->bi_private = sh;
+
pr_debug("%s: for %llu schedule op %ld on disc %d\n",
__func__, (unsigned long long)sh->sector,
bi->bi_rw, i);
@@ -664,12 +663,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags))
bi->bi_rw |= REQ_FLUSH;

- bi->bi_flags = 1 << BIO_UPTODATE;
- bi->bi_idx = 0;
bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
bi->bi_io_vec[0].bv_offset = 0;
bi->bi_size = STRIPE_SIZE;
- bi->bi_next = NULL;
if (rrdev)
set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
trace_block_bio_remap(bdev_get_queue(bi->bi_bdev),
@@ -684,7 +680,13 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)

set_bit(STRIPE_IO_STARTED, &sh->state);

+ bio_reset(rbi);
rbi->bi_bdev = rrdev->bdev;
+ rbi->bi_rw = rw;
+ BUG_ON(!(rw & WRITE));
+ rbi->bi_end_io = raid5_end_write_request;
+ rbi->bi_private = sh;
+
pr_debug("%s: for %llu schedule op %ld on "
"replacement disc %d\n",
__func__, (unsigned long long)sh->sector,
@@ -696,12 +698,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
else
rbi->bi_sector = (sh->sector
+ rrdev->data_offset);
- rbi->bi_flags = 1 << BIO_UPTODATE;
- rbi->bi_idx = 0;
rbi->bi_io_vec[0].bv_len = STRIPE_SIZE;
rbi->bi_io_vec[0].bv_offset = 0;
rbi->bi_size = STRIPE_SIZE;
- rbi->bi_next = NULL;
trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev),
rbi, disk_devt(conf->mddev->gendisk),
sh->dev[i].sector);
--
1.7.12

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