From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03787C77B6F for ; Tue, 11 Apr 2023 20:57:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229661AbjDKU5j (ORCPT ); Tue, 11 Apr 2023 16:57:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229690AbjDKU5g (ORCPT ); Tue, 11 Apr 2023 16:57:36 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67514198A for ; Tue, 11 Apr 2023 13:57:35 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 03D7162C0A for ; Tue, 11 Apr 2023 20:57:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59A87C433EF; Tue, 11 Apr 2023 20:57:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1681246654; bh=oVp0Wev8fZeTy98Y7KAg4uqkGcQYwmIxKo2BS0HnV0E=; h=Date:To:From:Subject:From; b=cKKLSU997QdhmheGn1COnwSE8/J1XYXJrK7/vTkgdgHH/h0Pou0Mux2TUNE0amVyR YwUQrhY6wmJdjiVXFQg+WdIjGC3GtIPggorSA4IHHZk5q7eLmkVPJ/PC3TRlo8Uw9V 7zuG3/2Znow5LrocB4dgiKHh/vc0xlPIXlN1xdkA= Date: Tue, 11 Apr 2023 13:57:33 -0700 To: mm-commits@vger.kernel.org, senozhatsky@chromium.org, minchan@kernel.org, axboe@kernel.dk, hch@lst.de, akpm@linux-foundation.org From: Andrew Morton Subject: + zram-refactor-highlevel-read-and-write-handling.patch added to mm-unstable branch Message-Id: <20230411205734.59A87C433EF@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: zram: refactor highlevel read and write handling has been added to the -mm mm-unstable branch. Its filename is zram-refactor-highlevel-read-and-write-handling.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-refactor-highlevel-read-and-write-handling.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Christoph Hellwig Subject: zram: refactor highlevel read and write handling Date: Tue, 11 Apr 2023 19:14:49 +0200 Instead of having an outer loop in __zram_make_request and then branch out for reads vs writes for each loop iteration in zram_bvec_rw, split the main handler into separat zram_bio_read and zram_bio_write handlers that also include the functionality formerly in zram_bvec_rw. Link: https://lkml.kernel.org/r/20230411171459.567614-8-hch@lst.de Signed-off-by: Christoph Hellwig Acked-by: Minchan Kim Cc: Jens Axboe Cc: Sergey Senozhatsky Signed-off-by: Andrew Morton --- drivers/block/zram/zram_drv.c | 58 ++++++++++++++++---------------- 1 file changed, 30 insertions(+), 28 deletions(-) --- a/drivers/block/zram/zram_drv.c~zram-refactor-highlevel-read-and-write-handling +++ a/drivers/block/zram/zram_drv.c @@ -1921,38 +1921,34 @@ static void zram_bio_discard(struct zram bio_endio(bio); } -/* - * Returns errno if it has some problem. Otherwise return 0 or 1. - * Returns 0 if IO request was done synchronously - * Returns 1 if IO request was successfully submitted. - */ -static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index, - int offset, enum req_op op, struct bio *bio) +static void zram_bio_read(struct zram *zram, struct bio *bio) { - int ret; + struct bvec_iter iter; + struct bio_vec bv; + unsigned long start_time; + + start_time = bio_start_io_acct(bio); + bio_for_each_segment(bv, bio, iter) { + u32 index = iter.bi_sector >> SECTORS_PER_PAGE_SHIFT; + u32 offset = (iter.bi_sector & (SECTORS_PER_PAGE - 1)) << + SECTOR_SHIFT; - if (!op_is_write(op)) { - ret = zram_bvec_read(zram, bvec, index, offset, bio); - if (unlikely(ret < 0)) { + if (zram_bvec_read(zram, &bv, index, offset, bio) < 0) { atomic64_inc(&zram->stats.failed_reads); - return ret; - } - flush_dcache_page(bvec->bv_page); - } else { - ret = zram_bvec_write(zram, bvec, index, offset, bio); - if (unlikely(ret < 0)) { - atomic64_inc(&zram->stats.failed_writes); - return ret; + bio->bi_status = BLK_STS_IOERR; + break; } - } + flush_dcache_page(bv.bv_page); - zram_slot_lock(zram, index); - zram_accessed(zram, index); - zram_slot_unlock(zram, index); - return 0; + zram_slot_lock(zram, index); + zram_accessed(zram, index); + zram_slot_unlock(zram, index); + } + bio_end_io_acct(bio, start_time); + bio_endio(bio); } -static void __zram_make_request(struct zram *zram, struct bio *bio) +static void zram_bio_write(struct zram *zram, struct bio *bio) { struct bvec_iter iter; struct bio_vec bv; @@ -1964,11 +1960,15 @@ static void __zram_make_request(struct z u32 offset = (iter.bi_sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; - if (zram_bvec_rw(zram, &bv, index, offset, bio_op(bio), - bio) < 0) { + if (zram_bvec_write(zram, &bv, index, offset, bio) < 0) { + atomic64_inc(&zram->stats.failed_writes); bio->bi_status = BLK_STS_IOERR; break; } + + zram_slot_lock(zram, index); + zram_accessed(zram, index); + zram_slot_unlock(zram, index); } bio_end_io_acct(bio, start_time); bio_endio(bio); @@ -1983,8 +1983,10 @@ static void zram_submit_bio(struct bio * switch (bio_op(bio)) { case REQ_OP_READ: + zram_bio_read(zram, bio); + break; case REQ_OP_WRITE: - __zram_make_request(zram, bio); + zram_bio_write(zram, bio); break; case REQ_OP_DISCARD: case REQ_OP_WRITE_ZEROES: _ Patches currently in -mm which might be from hch@lst.de are zram-always-compile-read_from_bdev_sync.patch zram-remove-valid_io_request.patch zram-make-zram_bio_discard-more-self-contained.patch zram-simplify-bvec-iteration-in-__zram_make_request.patch zram-move-discard-handling-to-zram_submit_bio.patch zram-return-early-on-error-in-zram_bvec_rw.patch zram-refactor-highlevel-read-and-write-handling.patch zram-dont-use-highmem-for-the-bounce-buffer-in-zram_bvec_readwrite.patch zram-rename-__zram_bvec_read-to-zram_read_page.patch zram-directly-call-zram_read_page-in-writeback_store.patch zram-refactor-zram_bdev_read.patch zram-dont-pass-a-bvec-to-__zram_bvec_write.patch zram-refactor-zram_bdev_write.patch zram-pass-a-page-to-read_from_bdev.patch zram-dont-return-errors-from-read_from_bdev_async.patch zram-fix-synchronous-reads.patch zram-return-errors-from-read_from_bdev_sync.patch