On 10/01/2019 17:49, Johannes Thumshirn wrote: > Right, but we're looking for the number of already completed bytes to > rewind here, so from bvec.h's docs it is bi_bvec_done. > > Dmitriy can you see if this works for you: > > diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c > index e74455eb42f9..2d0e2eec5413 100644 > --- a/fs/btrfs/raid56.c > +++ b/fs/btrfs/raid56.c > @@ -1350,6 +1350,7 @@ static int find_bio_stripe(struct btrfs_raid_bio > *rbio, > struct btrfs_bio_stripe *stripe; > > physical <<= 9; > + physical -= bio->bi_iter.bi_bvec_done; OK talked to Hannes about this issue, he says the only way is to save the iterator state before submitting the bio. So the above is bogus too. This also is what Kent said in https://marc.info/?l=linux-block&m=153549921116441&w=2 -- Johannes Thumshirn SUSE Labs Filesystems jthumshirn@xxxxxxx +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
