raid5: use bio_reset()

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@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 4e0f87e..7bbd285 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -567,14 +567,6 @@ 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 */
@@ -649,7 +641,14 @@ 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);
@@ -663,12 +662,9 @@ 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),
@@ -683,7 +679,13 @@ 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,
@@ -695,12 +697,9 @@ 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);