On Thu, Jun 28, 2018 at 09:53:23AM -0600, Jens Axboe wrote: > On 6/27/18 2:12 PM, Bart Van Assche wrote: > > Although __bio_clone_fast() copies bi_io_vec, it does not copy bi_vcnt, > > the number of elements in bi_io_vec[] that contains data. Copy bi_vcnt > > such that code that needs this member behaves identically for original > > and for cloned requests. > > Applied - it's correct for the current base. > Any users of cloned bio shouldn't use this bio's .bi_vcnt directly, since this counter represents the original bio's actual io vector number, nothing related with the cloned bio. So I don't understand why we need to copy it. Thanks, Ming
