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Date: Fri, 25 May 2012 13:25:23 -0700 From: Kent Overstreet <koverstreet@...gle.com> To: linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org, dm-devel@...hat.com, linux-fsdevel@...r.kernel.org Cc: Kent Overstreet <koverstreet@...gle.com>, tj@...nel.org, axboe@...nel.dk, agk@...hat.com, neilb@...e.de, drbd-dev@...ts.linbit.com, bharrosh@...asas.com, vgoyal@...hat.com, mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net Subject: [PATCH v3 00/16] Block cleanups Incorporated various review feedback, and I reordered/reworked the patches to make them more coherent. This also has the latest version of the closure code, incorporating review feedback from Joe and Tejun. I may rewrite the bio splitting stuff to not depend on it so it can go in sooner (Tejun is not a fan of closures), but IMO the patch is better for using them. First 5 patches: Kill bi_destructor Next 3 patches: Better bio splitting Next 3 patches: Rework bio cloning to not clone entire bio vec Tejun also pointed out that with the bio splitting improvements we ought to be able to get rid of merge_bvec_fn, so I started on that. Those patches are definitely a WIP, though. For most of the md code, it looks like things will almost just work - they already had bio_pair_split() calls to handle single page bios that crossed bvec boundries, but bio_pair_split() now splits arbitrary bios so things should just work. (I just thought of one problem - previously, in practice you'd never need to split a bio more than once, but that's no longer true - so the bio_pair_split() calls do need to be stuck in a loop, and the as is the patches aren't correct.) For raid5 though I couldn't find any splitting in the existing code - it looks like it's depending on merge_bvec_fn to make sure bios never need to be split. Adding bio splitting looks to be not quite trivial - Neil, any thoughts? For dm, it was already splitting multi page bios when necessary, it looked like its merge_bvec_fn was mostly for propagating device limits - which my generic_make_request() patch handles. Any dm folks want to take a look? There are only 4 merge_bvec_fns left in my kernel: drivers/md/raid5.c - raid5_mergeable_bvec() drivers/block/drbd/drbd_req.c - drbd_merge_bvec() drivers/block/pktcdvd.c - pkt_merge_bvec() drivers/block/rbd.c - rbd_merge_bvec() I haven't looked at the last three, but if the maintainers want to help out a bit it should be pretty easy to get rid of merge_bvec_fn entirely. Kent Overstreet (16): block: Generalized bio pool freeing dm: Use bioset's front_pad for dm_rq_clone_bio_info block: Add bio_reset() pktcdvd: Switch to bio_kmalloc() block: Kill bi_destructor block: Add an explicit bio flag for bios that own their bvec block: Rename bio_split() -> bio_pair_split() block: Rework bio splitting block: Add bio_clone_kmalloc() block: Add bio_clone_bioset() block: Only clone bio vecs that are in use Closures Make generic_make_request handle arbitrarily large bios Gut bio_add_page() md: Kill merge_bvec_fn()s dm: Kill merge_bvec_fn() Documentation/block/biodoc.txt | 5 - block/blk-core.c | 126 ++++++- drivers/block/drbd/drbd_req.c | 18 +- drivers/block/osdblk.c | 3 +- drivers/block/pktcdvd.c | 121 +++---- drivers/block/rbd.c | 8 +- drivers/md/dm-crypt.c | 9 - drivers/md/dm-io.c | 11 - drivers/md/dm.c | 118 +------ drivers/md/linear.c | 52 +-- drivers/md/md.c | 44 +-- drivers/md/raid0.c | 70 +--- drivers/md/raid1.c | 34 -- drivers/md/raid10.c | 100 +----- drivers/target/target_core_iblock.c | 9 - fs/bio-integrity.c | 44 --- fs/bio.c | 437 ++++++++++++----------- fs/exofs/ore.c | 5 +- include/linux/bio.h | 43 ++- include/linux/blk_types.h | 9 +- include/linux/blkdev.h | 3 + include/linux/closure.h | 658 +++++++++++++++++++++++++++++++++++ lib/Kconfig.debug | 8 + lib/Makefile | 2 +- lib/closure.c | 344 ++++++++++++++++++ 25 files changed, 1482 insertions(+), 799 deletions(-) create mode 100644 include/linux/closure.h create mode 100644 lib/closure.c -- 1.7.9.3.327.g2980b -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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