Most targets just need a single flush bio. Open code that case in __send_duplicate_bios without the need to add the bio to a list.
Signed-off-by: Christoph Hellwig <[email protected]> --- drivers/md/dm.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index c05b6ff1bb957..78df75f57288b 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1241,15 +1241,6 @@ static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, struct bio *bio; int try; - if (!num_bios) - return; - - if (num_bios == 1) { - bio = alloc_tio(ci, ti, 0, len, GFP_NOIO); - bio_list_add(blist, bio); - return; - } - for (try = 0; try < 2; try++) { int bio_nr; @@ -1279,12 +1270,23 @@ static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, struct bio_list blist = BIO_EMPTY_LIST; struct bio *clone; - alloc_multiple_bios(&blist, ci, ti, num_bios, len); - - while ((clone = bio_list_pop(&blist))) { + switch (num_bios) { + case 0: + break; + case 1: + clone = alloc_tio(ci, ti, 0, len, GFP_NOIO); if (len) bio_setup_sector(clone, ci->sector, *len); __map_bio(clone); + break; + default: + alloc_multiple_bios(&blist, ci, ti, num_bios, len); + while ((clone = bio_list_pop(&blist))) { + if (len) + bio_setup_sector(clone, ci->sector, *len); + __map_bio(clone); + } + break; } } -- 2.30.2 -- dm-devel mailing list [email protected] https://listman.redhat.com/mailman/listinfo/dm-devel
