On Thu, Oct 22, 2020 at 01:54:16PM -0400, Mike Snitzer wrote: > On Thu, Oct 22, 2020 at 11:14 AM Darrick J. Wong > > Stupid question: Why don't you change the block layer to make it > > possible to insert device mapper devices after the blockdev has been set > > up? > > Not a stupid question. Definitely something that us DM developers > have wanted to do for a while. Devil is in the details but it is the > right way forward. > Yes, I think that is the right thing to do. And I don't think it should be all that hard. All we'd need in the I/O path is something like the pseudo-patch below, which will allow the interposer driver to resubmit bios using submit_bio_noacct as long as the driver sets BIO_INTERPOSED. diff --git a/block/blk-core.c b/block/blk-core.c index ac00d2fa4eb48d..3f6f1eb565e0a8 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1051,6 +1051,9 @@ blk_qc_t submit_bio_noacct(struct bio *bio) return BLK_QC_T_NONE; } + if (blk_has_interposer(bio->bi_disk) && + !(bio->bi_flags & BIO_INTERPOSED)) + return __submit_bio_interposed(bio); if (!bio->bi_disk->fops->submit_bio) return __submit_bio_noacct_mq(bio); return __submit_bio_noacct(bio);
