From patchwork Tue Apr 18 22:12:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sarthak Kukreti X-Patchwork-Id: 13216186 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 665CCC77B76 for ; Tue, 18 Apr 2023 22:13:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232867AbjDRWNF (ORCPT ); Tue, 18 Apr 2023 18:13:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233200AbjDRWMm (ORCPT ); Tue, 18 Apr 2023 18:12:42 -0400 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 862BC6EAB for ; Tue, 18 Apr 2023 15:12:35 -0700 (PDT) Received: by mail-pl1-x62d.google.com with SMTP id d9443c01a7336-1a6670671e3so22857535ad.0 for ; Tue, 18 Apr 2023 15:12:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1681855955; x=1684447955; 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=DJ+yGPB/3GoY7peOyZ+CblNlWIiKQ+IujQrkD9HaThI=; b=JCDbU/1Bhcl2YTj6lbZ8vWIJJgUX2ZBx7G1LvK9zy76LTAJd32O6W7BwyOtGTnXIPY 4fTpOYl3vnOuO33PE9j8K486WzNAqN1s15u5FrvCJvsazYo2SrKcYSyD9AF0Yn+alco0 ukXRsiqT0/g2OCfSlkCDQQe7njZVTqrULBWrs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681855955; x=1684447955; 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=DJ+yGPB/3GoY7peOyZ+CblNlWIiKQ+IujQrkD9HaThI=; b=lnUjVVbiWpJfGL8hZlcS5Q13FzIb1NuIo5mm/m/PvOtvD/F2HecvDwzFDMj8JFHHmQ 7ESIKlzxD1v8UVbSnue2Lscitu0EMKmVJ3opHOqNCIhmeKkdlOK6nus3tAWA0QvY+JTM Mqth1b3zVmqcB1VQL454JQJsq2IBU/q1sGO7jg9bIgOiMxsxrFISy0PUH7RRq8BWrWEi jmyiyU/blZAHGRrvKXuNa6rX+wIup/KqPVhSdf+WyQJ4IY+aEVzZxZwlB3TIn+UJaqK2 ZQl0L4HE8IO4yqUHVDsfIAGnr7uDRTKaC1rIpCwyg2V3WeZCmgP8G8lvT6T2MBLPR1mL is/Q== X-Gm-Message-State: AAQBX9eFWg1syz62VEV2CaBHFjmR0aCiOpiEVKE59GUhgSehVw7bc/jE q0ylbsdLoVJuDyqdeADMV1JzFw== X-Google-Smtp-Source: AKy350bdGW8lcpNwvg5/Io7seNtW+tP5EWMmhIyDjAkmWhtkJNkd0WaYZiBs0G+Q7zXofrJZlCjQtg== X-Received: by 2002:a17:903:11cc:b0:1a6:4541:73c with SMTP id q12-20020a17090311cc00b001a64541073cmr3738421plh.33.1681855955208; Tue, 18 Apr 2023 15:12:35 -0700 (PDT) Received: from sarthakkukreti-glaptop.corp.google.com ([2620:15c:9d:200:e38b:ca5e:3203:48d3]) by smtp.gmail.com with ESMTPSA id x1-20020a1709029a4100b001a687c505e9sm9911892plv.237.2023.04.18.15.12.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Apr 2023 15:12:34 -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 , Daniil Lunev , "Darrick J. Wong" Subject: [PATCH v4 4/4] loop: Add support for provision requests Date: Tue, 18 Apr 2023 15:12:07 -0700 Message-ID: <20230418221207.244685-5-sarthakkukreti@chromium.org> X-Mailer: git-send-email 2.40.0.634.g4ca3ef3211-goog In-Reply-To: <20230418221207.244685-1-sarthakkukreti@chromium.org> References: <20230414000219.92640-1-sarthakkukreti@chromium.org> <20230418221207.244685-1-sarthakkukreti@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add support for provision requests to loopback devices. Loop devices will configure provision support based on whether the underlying block device/file can support the provision request and upon receiving a provision bio, will map it to the backing device/storage. For loop devices over files, a REQ_OP_PROVISION request will translate to an fallocate mode 0 call on the backing file. Signed-off-by: Sarthak Kukreti --- drivers/block/loop.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index bc31bb7072a2..13c4b4f8b9c1 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -327,6 +327,24 @@ static int lo_fallocate(struct loop_device *lo, struct request *rq, loff_t pos, return ret; } +static int lo_req_provision(struct loop_device *lo, struct request *rq, loff_t pos) +{ + struct file *file = lo->lo_backing_file; + struct request_queue *q = lo->lo_queue; + int ret; + + if (!q->limits.max_provision_sectors) { + ret = -EOPNOTSUPP; + goto out; + } + + ret = file->f_op->fallocate(file, 0, pos, blk_rq_bytes(rq)); + if (unlikely(ret && ret != -EINVAL && ret != -EOPNOTSUPP)) + ret = -EIO; + out: + return ret; +} + static int lo_req_flush(struct loop_device *lo, struct request *rq) { int ret = vfs_fsync(lo->lo_backing_file, 0); @@ -488,6 +506,8 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq) FALLOC_FL_PUNCH_HOLE); case REQ_OP_DISCARD: return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE); + case REQ_OP_PROVISION: + return lo_req_provision(lo, rq, pos); case REQ_OP_WRITE: if (cmd->use_aio) return lo_rw_aio(lo, cmd, pos, ITER_SOURCE); @@ -754,6 +774,25 @@ static void loop_sysfs_exit(struct loop_device *lo) &loop_attribute_group); } +static void loop_config_provision(struct loop_device *lo) +{ + struct file *file = lo->lo_backing_file; + struct inode *inode = file->f_mapping->host; + + /* + * If the backing device is a block device, mirror its provisioning + * capability. + */ + if (S_ISBLK(inode->i_mode)) { + blk_queue_max_provision_sectors(lo->lo_queue, + bdev_max_provision_sectors(I_BDEV(inode))); + } else if (file->f_op->fallocate) { + blk_queue_max_provision_sectors(lo->lo_queue, UINT_MAX >> 9); + } else { + blk_queue_max_provision_sectors(lo->lo_queue, 0); + } +} + static void loop_config_discard(struct loop_device *lo) { struct file *file = lo->lo_backing_file; @@ -1092,6 +1131,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, blk_queue_io_min(lo->lo_queue, bsize); loop_config_discard(lo); + loop_config_provision(lo); loop_update_rotational(lo); loop_update_dio(lo); loop_sysfs_init(lo); @@ -1304,6 +1344,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) } loop_config_discard(lo); + loop_config_provision(lo); /* update dio if lo_offset or transfer is changed */ __loop_update_dio(lo, lo->use_dio); @@ -1830,6 +1871,7 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx, case REQ_OP_FLUSH: case REQ_OP_DISCARD: case REQ_OP_WRITE_ZEROES: + case REQ_OP_PROVISION: cmd->use_aio = false; break; default: