Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753153Ab3J2USb (ORCPT ); Tue, 29 Oct 2013 16:18:31 -0400 Received: from mail-pd0-f173.google.com ([209.85.192.173]:48625 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753068Ab3J2US1 (ORCPT ); Tue, 29 Oct 2013 16:18:27 -0400 From: Kent Overstreet To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, hch@infradead.org, tj@kernel.org, nab@linux-iscsi.org, Kent Overstreet Subject: [PATCH 03/23] bcache: Kill unaligned bvec hack Date: Tue, 29 Oct 2013 13:17:56 -0700 Message-Id: <1383077896-4132-4-git-send-email-kmo@daterainc.com> X-Mailer: git-send-email 1.8.4.rc3 In-Reply-To: <1383077896-4132-1-git-send-email-kmo@daterainc.com> References: <1383077896-4132-1-git-send-email-kmo@daterainc.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5323 Lines: 172 Bcache has a hack to avoid cloning the biovec if it's all full pages - but with immutable biovecs coming this won't be necessary anymore. For now, we remove the special case and always clone the bvec array so that the immutable biovec patches are simpler. Signed-off-by: Kent Overstreet --- drivers/md/bcache/bcache.h | 1 - drivers/md/bcache/debug.c | 4 ---- drivers/md/bcache/request.c | 32 +++++--------------------------- drivers/md/bcache/request.h | 2 +- drivers/md/bcache/super.c | 4 ---- 5 files changed, 6 insertions(+), 37 deletions(-) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 0f12382..206c82b 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -443,7 +443,6 @@ struct bcache_device { unsigned long sectors_dirty_last; long sectors_dirty_derivative; - mempool_t *unaligned_bvec; struct bio_set *bio_split; unsigned data_csum:1; diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c index 88e6411..545680b 100644 --- a/drivers/md/bcache/debug.c +++ b/drivers/md/bcache/debug.c @@ -191,10 +191,6 @@ void bch_data_verify(struct search *s) struct bio_vec *bv; int i; - if (!s->unaligned_bvec) - bio_for_each_segment(bv, s->orig_bio, i) - bv->bv_offset = 0, bv->bv_len = PAGE_SIZE; - check = bio_clone(s->orig_bio, GFP_NOIO); if (!check) return; diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index b6a74bc..00cc9be 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -679,10 +679,14 @@ static void bio_complete(struct search *s) static void do_bio_hook(struct search *s) { struct bio *bio = &s->bio.bio; - memcpy(bio, s->orig_bio, sizeof(struct bio)); + bio_init(bio); + bio->bi_io_vec = s->bv; + bio->bi_max_vecs = BIO_MAX_PAGES; + __bio_clone(bio, s->orig_bio); bio->bi_end_io = request_endio; bio->bi_private = &s->cl; + atomic_set(&bio->bi_cnt, 3); } @@ -694,16 +698,12 @@ static void search_free(struct closure *cl) if (s->op.cache_bio) bio_put(s->op.cache_bio); - if (s->unaligned_bvec) - mempool_free(s->bio.bio.bi_io_vec, s->d->unaligned_bvec); - closure_debug_destroy(cl); mempool_free(s, s->d->c->search); } static struct search *search_alloc(struct bio *bio, struct bcache_device *d) { - struct bio_vec *bv; struct search *s = mempool_alloc(d->c->search, GFP_NOIO); memset(s, 0, offsetof(struct search, op.keys)); @@ -722,15 +722,6 @@ static struct search *search_alloc(struct bio *bio, struct bcache_device *d) s->start_time = jiffies; do_bio_hook(s); - if (bio->bi_size != bio_segments(bio) * PAGE_SIZE) { - bv = mempool_alloc(d->unaligned_bvec, GFP_NOIO); - memcpy(bv, bio_iovec(bio), - sizeof(struct bio_vec) * bio_segments(bio)); - - s->bio.bio.bi_io_vec = bv; - s->unaligned_bvec = 1; - } - return s; } @@ -780,26 +771,13 @@ static void cached_dev_read_complete(struct closure *cl) static void request_read_error(struct closure *cl) { struct search *s = container_of(cl, struct search, cl); - struct bio_vec *bv; - int i; if (s->recoverable) { /* Retry from the backing device: */ trace_bcache_read_retry(s->orig_bio); s->error = 0; - bv = s->bio.bio.bi_io_vec; do_bio_hook(s); - s->bio.bio.bi_io_vec = bv; - - if (!s->unaligned_bvec) - bio_for_each_segment(bv, s->orig_bio, i) - bv->bv_offset = 0, bv->bv_len = PAGE_SIZE; - else - memcpy(s->bio.bio.bi_io_vec, - bio_iovec(s->orig_bio), - sizeof(struct bio_vec) * - bio_segments(s->orig_bio)); /* XXX: invalidate cache */ diff --git a/drivers/md/bcache/request.h b/drivers/md/bcache/request.h index 57dc478..bee95a9 100644 --- a/drivers/md/bcache/request.h +++ b/drivers/md/bcache/request.h @@ -16,7 +16,6 @@ struct search { unsigned cache_bio_sectors; unsigned recoverable:1; - unsigned unaligned_bvec:1; unsigned write:1; unsigned writeback:1; @@ -27,6 +26,7 @@ struct search { /* Anything past op->keys won't get zeroed in do_bio_hook */ struct btree_op op; + struct bio_vec bv[BIO_MAX_PAGES]; }; void bch_cache_read_endio(struct bio *, int); diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 547c4c5..dc073eb 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -743,8 +743,6 @@ static void bcache_device_free(struct bcache_device *d) put_disk(d->disk); bio_split_pool_free(&d->bio_split_hook); - if (d->unaligned_bvec) - mempool_destroy(d->unaligned_bvec); if (d->bio_split) bioset_free(d->bio_split); if (is_vmalloc_addr(d->stripe_sectors_dirty)) @@ -778,8 +776,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, return -ENOMEM; if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) || - !(d->unaligned_bvec = mempool_create_kmalloc_pool(1, - sizeof(struct bio_vec) * BIO_MAX_PAGES)) || bio_split_pool_init(&d->bio_split_hook) || !(d->disk = alloc_disk(1)) || !(q = blk_alloc_queue(GFP_KERNEL))) -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/