raid10: Use bio_reset()

More prep work for immutable bio vecs, mainly getting rid of references
to bi_idx.

bio_reset was being open coded in a few places. The one in sync_request
was a bit nontrivial to convert, so could use some extra eyeballs.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: NeilBrown <neilb@suse.de>
Acked-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 434586d..e32e8b1 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2077,13 +2077,10 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
                 * First we need to fixup bv_offset, bv_len and
                 * bi_vecs, as the read request might have corrupted these
                 */
+               bio_reset(tbio);
+
                tbio->bi_vcnt = vcnt;
                tbio->bi_size = r10_bio->sectors << 9;
-               tbio->bi_idx = 0;
-               tbio->bi_phys_segments = 0;
-               tbio->bi_flags &= ~(BIO_POOL_MASK - 1);
-               tbio->bi_flags |= 1 << BIO_UPTODATE;
-               tbio->bi_next = NULL;
                tbio->bi_rw = WRITE;
                tbio->bi_private = r10_bio;
                tbio->bi_sector = r10_bio->devs[i].addr;
@@ -3090,6 +3087,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
                                        }
                                }
                                bio = r10_bio->devs[0].bio;
+                               bio_reset(bio);
                                bio->bi_next = biolist;
                                biolist = bio;
                                bio->bi_private = r10_bio;
@@ -3114,6 +3112,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
                                rdev = mirror->rdev;
                                if (!test_bit(In_sync, &rdev->flags)) {
                                        bio = r10_bio->devs[1].bio;
+                                       bio_reset(bio);
                                        bio->bi_next = biolist;
                                        biolist = bio;
                                        bio->bi_private = r10_bio;
@@ -3142,6 +3141,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
                                if (rdev == NULL || bio == NULL ||
                                    test_bit(Faulty, &rdev->flags))
                                        break;
+                               bio_reset(bio);
                                bio->bi_next = biolist;
                                biolist = bio;
                                bio->bi_private = r10_bio;
@@ -3240,7 +3240,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
                                r10_bio->devs[i].repl_bio->bi_end_io = NULL;
 
                        bio = r10_bio->devs[i].bio;
-                       bio->bi_end_io = NULL;
+                       bio_reset(bio);
                        clear_bit(BIO_UPTODATE, &bio->bi_flags);
                        if (conf->mirrors[d].rdev == NULL ||
                            test_bit(Faulty, &conf->mirrors[d].rdev->flags))
@@ -3277,6 +3277,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 
                        /* Need to set up for writing to the replacement */
                        bio = r10_bio->devs[i].repl_bio;
+                       bio_reset(bio);
                        clear_bit(BIO_UPTODATE, &bio->bi_flags);
 
                        sector = r10_bio->devs[i].addr;
@@ -3310,17 +3311,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
                }
        }
 
-       for (bio = biolist; bio ; bio=bio->bi_next) {
-
-               bio->bi_flags &= ~(BIO_POOL_MASK - 1);
-               if (bio->bi_end_io)
-                       bio->bi_flags |= 1 << BIO_UPTODATE;
-               bio->bi_vcnt = 0;
-               bio->bi_idx = 0;
-               bio->bi_phys_segments = 0;
-               bio->bi_size = 0;
-       }
-
        nr_sectors = 0;
        if (sector_nr + max_sync < max_sector)
                max_sector = sector_nr + max_sync;
@@ -4390,17 +4380,14 @@ read_more:
                }
                if (!rdev2 || test_bit(Faulty, &rdev2->flags))
                        continue;
+
+               bio_reset(b);
                b->bi_bdev = rdev2->bdev;
                b->bi_sector = r10_bio->devs[s/2].addr + rdev2->new_data_offset;
                b->bi_private = r10_bio;
                b->bi_end_io = end_reshape_write;
                b->bi_rw = WRITE;
-               b->bi_flags &= ~(BIO_POOL_MASK - 1);
-               b->bi_flags |= 1 << BIO_UPTODATE;
                b->bi_next = blist;
-               b->bi_vcnt = 0;
-               b->bi_idx = 0;
-               b->bi_size = 0;
                blist = b;
        }