From patchwork Sat May 6 06:29:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sarthak Kukreti X-Patchwork-Id: 13233312 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 5562CC7EE37 for ; Sat, 6 May 2023 06:29:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230219AbjEFG3j (ORCPT ); Sat, 6 May 2023 02:29:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229973AbjEFG32 (ORCPT ); Sat, 6 May 2023 02:29:28 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3FFB68A76 for ; Fri, 5 May 2023 23:29:26 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id d9443c01a7336-1ab032d9266so24367885ad.0 for ; Fri, 05 May 2023 23:29:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1683354566; x=1685946566; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=GA9/r1+W52jO7n2EjPCELUtEsZGxSnkL540gJUY9gpA=; b=GB0N8axleFFpirH/WmF1g9f99okHbh8g8gp06TveEZqIkmQ30yB/pH6wQ/umVZP/Lc Fm3Qm8Q3WbjHGo1s+YH5daC9mP8AvHv55CLeeA9Yy1dXwq+XOKGlqxKS7Q4lkR6ertny HaWE0Hi1ovT0B6xj/3GwtgGPui4EIVsa1/Kug= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683354566; x=1685946566; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=GA9/r1+W52jO7n2EjPCELUtEsZGxSnkL540gJUY9gpA=; b=RROT4j/00EK9EQdITP413cEi2vP8vthTqsnQb1mEbRwawTGsRVmkWCCph6ln3XkdcS Gy+wFVVvsrsD1rph+WK4AjfZSN14wU3vPZ4v35mAb1knoN7CK7FKgVHIKybrS7EdbhUp nnIhcY/+q6FibGBw3QMvh60WrResqZrBRlNsSKx1xgY9XfvLrCgmNKIiazY1dr3zqhLz ENbjqM5uMZk9eHCmaXoKpqRw41b14txcAbreYzxDMQ+KboqGTthx67cKe5OrgBGBjFT4 FszbAznDmFtOD/4gEND3imYx++j5bezaYcK5V242feSuPzkaVsM/cwTCTWELA3XrhuhX Fyag== X-Gm-Message-State: AC+VfDz7yEuQFrUzC09J2A1zZLVeDGAt+h8lc2S0RDoDDzuGDLsHI0F9 VnaYvTJ/BaHFHXRoAHAsiRtpAw== X-Google-Smtp-Source: ACHHUZ6iXH31TKEcFeJO2THvYCclO77s9oxA5PJtr3JzdCO9jaDgPgMy1cJ3NJNUbXwScTT37BZQpw== X-Received: by 2002:a17:902:8691:b0:19a:9890:eac6 with SMTP id g17-20020a170902869100b0019a9890eac6mr3683354plo.24.1683354565876; Fri, 05 May 2023 23:29:25 -0700 (PDT) Received: from sarthakkukreti-glaptop.hsd1.ca.comcast.net ([2601:647:4200:b5b0:f19c:a713:5517:ed4]) by smtp.gmail.com with ESMTPSA id q16-20020a170902dad000b001ac381f1ce9sm2793598plx.185.2023.05.05.23.29.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 May 2023 23:29:25 -0700 (PDT) From: Sarthak Kukreti To: dm-devel@redhat.com, linux-block@vger.kernel.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Jens Axboe , "Michael S. Tsirkin" , Jason Wang , Stefan Hajnoczi , Alasdair Kergon , Mike Snitzer , Christoph Hellwig , Brian Foster , Theodore Ts'o , Andreas Dilger , Bart Van Assche , "Darrick J. Wong" Subject: [PATCH v6 4/5] dm-thin: Add REQ_OP_PROVISION support Date: Fri, 5 May 2023 23:29:08 -0700 Message-ID: <20230506062909.74601-5-sarthakkukreti@chromium.org> X-Mailer: git-send-email 2.40.1.521.gf1e218fcd8-goog In-Reply-To: <20230506062909.74601-1-sarthakkukreti@chromium.org> References: <20230420004850.297045-1-sarthakkukreti@chromium.org> <20230506062909.74601-1-sarthakkukreti@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org dm-thinpool uses the provision request to provision blocks for a dm-thin device. dm-thinpool currently does not pass through REQ_OP_PROVISION to underlying devices. For shared blocks, provision requests will break sharing and copy the contents of the entire block. Additionally, if 'skip_block_zeroing' is not set, dm-thin will opt to zero out the entire range as a part of provisioning. Signed-off-by: Sarthak Kukreti --- drivers/md/dm-thin.c | 70 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 66 insertions(+), 4 deletions(-) diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 2b13c949bd72..3f94f53ac956 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -274,6 +274,7 @@ struct pool { process_bio_fn process_bio; process_bio_fn process_discard; + process_bio_fn process_provision; process_cell_fn process_cell; process_cell_fn process_discard_cell; @@ -913,7 +914,8 @@ static void __inc_remap_and_issue_cell(void *context, struct bio *bio; while ((bio = bio_list_pop(&cell->bios))) { - if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD) + if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD || + bio_op(bio) == REQ_OP_PROVISION) bio_list_add(&info->defer_bios, bio); else { inc_all_io_entry(info->tc->pool, bio); @@ -1245,8 +1247,8 @@ static int io_overlaps_block(struct pool *pool, struct bio *bio) static int io_overwrites_block(struct pool *pool, struct bio *bio) { - return (bio_data_dir(bio) == WRITE) && - io_overlaps_block(pool, bio); + return (bio_data_dir(bio) == WRITE) && io_overlaps_block(pool, bio) && + bio_op(bio) != REQ_OP_PROVISION; } static void save_and_set_endio(struct bio *bio, bio_end_io_t **save, @@ -1953,6 +1955,51 @@ static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block } } +static void process_provision_bio(struct thin_c *tc, struct bio *bio) +{ + int r; + struct pool *pool = tc->pool; + dm_block_t block = get_bio_block(tc, bio); + struct dm_bio_prison_cell *cell; + struct dm_cell_key key; + struct dm_thin_lookup_result lookup_result; + + /* + * If cell is already occupied, then the block is already + * being provisioned so we have nothing further to do here. + */ + build_virtual_key(tc->td, block, &key); + if (bio_detain(pool, &key, bio, &cell)) + return; + + if (tc->requeue_mode) { + cell_requeue(pool, cell); + return; + } + + r = dm_thin_find_block(tc->td, block, 1, &lookup_result); + switch (r) { + case 0: + if (lookup_result.shared) { + process_shared_bio(tc, bio, block, &lookup_result, cell); + } else { + bio_endio(bio); + cell_defer_no_holder(tc, cell); + } + break; + case -ENODATA: + provision_block(tc, bio, block, cell); + break; + + default: + DMERR_LIMIT("%s: dm_thin_find_block() failed: error = %d", + __func__, r); + cell_defer_no_holder(tc, cell); + bio_io_error(bio); + break; + } +} + static void process_cell(struct thin_c *tc, struct dm_bio_prison_cell *cell) { int r; @@ -2228,6 +2275,8 @@ static void process_thin_deferred_bios(struct thin_c *tc) if (bio_op(bio) == REQ_OP_DISCARD) pool->process_discard(tc, bio); + else if (bio_op(bio) == REQ_OP_PROVISION) + pool->process_provision(tc, bio); else pool->process_bio(tc, bio); @@ -2579,6 +2628,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) dm_pool_metadata_read_only(pool->pmd); pool->process_bio = process_bio_fail; pool->process_discard = process_bio_fail; + pool->process_provision = process_bio_fail; pool->process_cell = process_cell_fail; pool->process_discard_cell = process_cell_fail; pool->process_prepared_mapping = process_prepared_mapping_fail; @@ -2592,6 +2642,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) dm_pool_metadata_read_only(pool->pmd); pool->process_bio = process_bio_read_only; pool->process_discard = process_bio_success; + pool->process_provision = process_bio_fail; pool->process_cell = process_cell_read_only; pool->process_discard_cell = process_cell_success; pool->process_prepared_mapping = process_prepared_mapping_fail; @@ -2612,6 +2663,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) pool->out_of_data_space = true; pool->process_bio = process_bio_read_only; pool->process_discard = process_discard_bio; + pool->process_provision = process_bio_fail; pool->process_cell = process_cell_read_only; pool->process_prepared_mapping = process_prepared_mapping; set_discard_callbacks(pool); @@ -2628,6 +2680,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode) dm_pool_metadata_read_write(pool->pmd); pool->process_bio = process_bio; pool->process_discard = process_discard_bio; + pool->process_provision = process_provision_bio; pool->process_cell = process_cell; pool->process_prepared_mapping = process_prepared_mapping; set_discard_callbacks(pool); @@ -2749,7 +2802,8 @@ static int thin_bio_map(struct dm_target *ti, struct bio *bio) return DM_MAPIO_SUBMITTED; } - if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD) { + if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD || + bio_op(bio) == REQ_OP_PROVISION) { thin_defer_bio_with_throttle(tc, bio); return DM_MAPIO_SUBMITTED; } @@ -3396,6 +3450,9 @@ static int pool_ctr(struct dm_target *ti, unsigned int argc, char **argv) pt->adjusted_pf = pt->requested_pf = pf; ti->num_flush_bios = 1; ti->limit_swap_bios = true; + ti->num_provision_bios = 1; + ti->provision_supported = true; + ti->max_provision_granularity = true; /* * Only need to enable discards if the pool should pass @@ -4114,6 +4171,8 @@ static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits) * The pool uses the same discard limits as the underlying data * device. DM core has already set this up. */ + + limits->max_provision_sectors = pool->sectors_per_block; } static struct target_type pool_target = { @@ -4288,6 +4347,9 @@ static int thin_ctr(struct dm_target *ti, unsigned int argc, char **argv) ti->max_discard_granularity = true; } + ti->num_provision_bios = 1; + ti->provision_supported = true; + mutex_unlock(&dm_thin_pool_table.mutex); spin_lock_irq(&tc->pool->lock);