On Thu, Sep 06, 2012 at 03:35:01PM -0700, Kent Overstreet wrote: > Previously, bio_kmalloc() and bio_alloc_bioset() behaved slightly > different because there was some almost-duplicated code - this fixes > some of that. > > The important change is that previously bio_kmalloc() always set > bi_io_vec = bi_inline_vecs, even if nr_iovecs == 0 - unlike > bio_alloc_bioset(). This would cause bio_has_data() to return true; I > don't know if this resulted in any actual bugs but it was certainly > wrong. > > bio_kmalloc() and bio_alloc_bioset() also have different arbitrary > limits on nr_iovecs - 1024 (UIO_MAXIOV) for bio_kmalloc(), 256 > (BIO_MAX_PAGES) for bio_alloc_bioset(). This patch doesn't fix that, but > at least they're enforced closer together and hopefully they will be > fixed in a later patch. > > This'll also help with some future cleanups - there are a fair number of > functions that allocate bios (e.g. bio_clone()), and now they don't have > to be duplicated for bio_alloc(), bio_alloc_bioset(), and bio_kmalloc(). > > Signed-off-by: Kent Overstreet <koverstreet@xxxxxxxxxx> > CC: Jens Axboe <axboe@xxxxxxxxx> > v7: Re-add dropped comments, improv patch description Acked-by: Tejun Heo <tj@xxxxxxxxxx> Thanks. -- tejun -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
