From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Goyal Subject: Re: [PATCH v2 01/14] block: Generalized bio pool freeing Date: Thu, 24 May 2012 13:46:49 -0400 Message-ID: <20120524174649.GC27550@redhat.com> References: <1337817771-25038-1-git-send-email-koverstreet@google.com> <1337817771-25038-2-git-send-email-koverstreet@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1337817771-25038-2-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Kent Overstreet Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org, agk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, neilb-l3A5Bk7waGM@public.gmane.org, drbd-dev-cunTk1MwBs8qoQakbn7OcQ@public.gmane.org, bharrosh-C4P08NqkoRlBDgjK7y7TUQ@public.gmane.org, mpatocka-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, sage-BnTBU8nroG7k1uMJSBkQmQ@public.gmane.org, yehuda-L5o5AL9CYN0tUFlbccrkMA@public.gmane.org List-Id: linux-bcache@vger.kernel.org On Wed, May 23, 2012 at 05:02:38PM -0700, Kent Overstreet wrote: > With the old code, when you allocate a bio from a bio pool you have to > implement your own destructor that knows how to find the bio pool the > bio was originally allocated from. > > This adds a new field to struct bio (bi_pool) and changes > bio_alloc_bioset() to use it. This makes various bio destructors > unnecessary, so they're then deleted. > [..] > @@ -419,7 +406,11 @@ void bio_put(struct bio *bio) > */ > if (atomic_dec_and_test(&bio->bi_cnt)) { > bio->bi_next = NULL; > - bio->bi_destructor(bio); > + > + if (bio->bi_pool) > + bio_free(bio, bio->bi_pool); > + else > + bio->bi_destructor(bio); If you have removed all the users of bi_destructor, then I am wondering that why are we retaining this field and trying to call into it when bio_pool is not set? Thanks Vivek