dm: move duplicate code from callers of alloc_tio into alloc_tio

Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 08689b3..ec230d3 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -565,13 +565,16 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
                unsigned target_bio_nr, unsigned *len, gfp_t gfp_mask)
 {
        struct dm_target_io *tio;
+       struct bio *clone;
 
        if (!ci->io->tio.io) {
                /* the dm_target_io embedded in ci->io is available */
                tio = &ci->io->tio;
+               /* alloc_io() already initialized embedded clone */
+               clone = &tio->clone;
        } else {
-               struct bio *clone = bio_alloc_clone(ci->bio->bi_bdev, ci->bio,
-                                                   gfp_mask, &ci->io->md->bs);
+               clone = bio_alloc_clone(ci->bio->bi_bdev, ci->bio,
+                                       gfp_mask, &ci->io->md->bs);
                if (!clone)
                        return NULL;
 
@@ -586,7 +589,13 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
        tio->len_ptr = len;
        tio->old_sector = 0;
 
-       return &tio->clone;
+       if (len) {
+               clone->bi_iter.bi_size = to_bytes(*len);
+               if (bio_integrity(clone))
+                       bio_integrity_trim(clone);
+       }
+
+       return clone;
 }
 
 static void free_tio(struct bio *clone)
@@ -1237,17 +1246,12 @@ static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
                break;
        case 1:
                clone = alloc_tio(ci, ti, 0, len, GFP_NOIO);
-               if (len)
-                       clone->bi_iter.bi_size = to_bytes(*len);
                __map_bio(clone);
                break;
        default:
                alloc_multiple_bios(&blist, ci, ti, num_bios, len);
-               while ((clone = bio_list_pop(&blist))) {
-                       if (len)
-                               clone->bi_iter.bi_size = to_bytes(*len);
+               while ((clone = bio_list_pop(&blist)))
                        __map_bio(clone);
-               }
                break;
        }
 }
@@ -1362,12 +1366,7 @@ static int __split_and_process_bio(struct clone_info *ci)
                return r;
 
        len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count);
-
        clone = alloc_tio(ci, ti, 0, &len, GFP_NOIO);
-       clone->bi_iter.bi_size = to_bytes(len);
-       if (bio_integrity(clone))
-               bio_integrity_trim(clone);
-
        __map_bio(clone);
 
        ci->sector += len;