diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index e417cf0a69e..7e469260fe5 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1152,15 +1152,23 @@ static void __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti { struct bio *bio = ci->bio; struct dm_target_io *tio; + unsigned target_bio_nr; + unsigned num_target_bios = 1; - tio = alloc_tio(ci, ti, nr_iovecs, 0); - - if (split_bvec) - clone_split_bio(tio, bio, sector, idx, offset, len); - else - clone_bio(tio, bio, sector, idx, bv_count, len); + /* + * Does the target want to receive duplicate copies of the bio? + */ + if (bio_data_dir(bio) == WRITE && ti->num_write_bios) + num_target_bios = ti->num_write_bios(ti, bio); - __map_bio(tio); + for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) { + tio = alloc_tio(ci, ti, nr_iovecs, target_bio_nr); + if (split_bvec) + clone_split_bio(tio, bio, sector, idx, offset, len); + else + clone_bio(tio, bio, sector, idx, bv_count, len); + __map_bio(tio); + } } typedef unsigned (*get_num_bios_fn)(struct dm_target *ti); |