From patchwork Mon Jun 28 00:02:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347155 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 520C2C48BC2 for ; Mon, 28 Jun 2021 00:03:31 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 095B961C17 for ; Mon, 28 Jun 2021 00:03:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 095B961C17 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=fujitsu.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4DAA08D0017; Sun, 27 Jun 2021 20:03:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4B0B08D0016; Sun, 27 Jun 2021 20:03:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 303F68D0017; Sun, 27 Jun 2021 20:03:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0134.hostedemail.com [216.40.44.134]) by kanga.kvack.org (Postfix) with ESMTP id F07FA8D0016 for ; Sun, 27 Jun 2021 20:03:29 -0400 (EDT) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id E4CF9FB50 for ; Mon, 28 Jun 2021 00:03:29 +0000 (UTC) X-FDA: 78301183338.31.7151628 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf18.hostedemail.com (Postfix) with ESMTP id B16D12001094 for ; Mon, 28 Jun 2021 00:03:28 +0000 (UTC) IronPort-HdrOrdr: A9a23:zsiqNai/4NpkHqZpZqe0lXFt43BQXjwji2hC6mlwRA09TySZ//rOoB19726MtN9xYgBZpTnuAtjifZqxz/FICMwqTNOftWrdyQ2VxeNZnOnfKlTbckWUnIMw6U4jSdkYNDSaNzhHZKjBjjVQa+xQpeVv7prY+dv2/jN8Sx1wcaF840NcAgafKEd/Qw5LHvMCZeChz/sCtzy9Ym4Wc8j+InEEWtLIr9rNmImjTgUBA3ccmXSzpALt+LjnCAKZwxtbdztOxI0p+W/Dnxe8xojLiYDB9iPh X-IronPort-AV: E=Sophos;i="5.83,304,1616428800"; d="scan'208";a="110256402" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Jun 2021 08:03:28 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id EC3084D0BA67; Mon, 28 Jun 2021 08:03:22 +0800 (CST) Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Jun 2021 08:03:13 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 28 Jun 2021 08:03:13 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 8/9] md: Implement dax_holder_operations Date: Mon, 28 Jun 2021 08:02:17 +0800 Message-ID: <20210628000218.387833-9-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210628000218.387833-1-ruansy.fnst@fujitsu.com> References: <20210628000218.387833-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: EC3084D0BA67.A17F2 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: B16D12001094 X-Stat-Signature: f5koctncep9r6zm3xjewgoatcyt54my1 Authentication-Results: imf18.hostedemail.com; dkim=none; spf=neutral (imf18.hostedemail.com: 183.91.158.132 is neither permitted nor denied by domain of ruansy.fnst@fujitsu.com) smtp.mailfrom=ruansy.fnst@fujitsu.com; dmarc=none X-HE-Tag: 1624838608-38583 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This is the case where the holder represents a mapped device, or a list of mapped devices more exactly(because it is possible to create more than one mapped device on one pmem device). Find out which mapped device the offset belongs to, and translate the offset from target device to mapped device. When it is done, call dax_corrupted_range() for the holder of this mapped device. Signed-off-by: Shiyang Ruan --- drivers/md/dm.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 125 insertions(+), 1 deletion(-) -- 2.32.0 diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ca2aedd8ee7d..11c9de0eca6d 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -749,7 +749,11 @@ static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU) } static char *_dm_claim_ptr = "I belong to device-mapper"; - +static const struct dax_holder_operations dm_dax_holder_ops; +struct dm_holder { + struct list_head list; + struct mapped_device *md; +}; /* * Open a table device so we can use it as a map destination. */ @@ -757,6 +761,8 @@ static int open_table_device(struct table_device *td, dev_t dev, struct mapped_device *md) { struct block_device *bdev; + struct list_head *holders; + struct dm_holder *holder; int r; @@ -774,6 +780,19 @@ static int open_table_device(struct table_device *td, dev_t dev, td->dm_dev.bdev = bdev; td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); + if (!td->dm_dev.dax_dev) + return 0; + + holders = dax_get_holder(td->dm_dev.dax_dev); + if (!holders) { + holders = kmalloc(sizeof(*holders), GFP_KERNEL); + INIT_LIST_HEAD(holders); + dax_set_holder(td->dm_dev.dax_dev, holders, &dm_dax_holder_ops); + } + holder = kmalloc(sizeof(*holder), GFP_KERNEL); + holder->md = md; + list_add_tail(&holder->list, holders); + return 0; } @@ -782,9 +801,27 @@ static int open_table_device(struct table_device *td, dev_t dev, */ static void close_table_device(struct table_device *td, struct mapped_device *md) { + struct list_head *holders; + struct dm_holder *holder, *n; + if (!td->dm_dev.bdev) return; + holders = dax_get_holder(td->dm_dev.dax_dev); + if (holders) { + list_for_each_entry_safe(holder, n, holders, list) { + if (holder->md == md) { + list_del(&holder->list); + kfree(holder); + } + } + if (list_empty(holders)) { + kfree(holders); + /* unset dax_device's holder_data */ + dax_set_holder(td->dm_dev.dax_dev, NULL, NULL); + } + } + bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); put_dax(td->dm_dev.dax_dev); @@ -1235,6 +1272,89 @@ static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, return ret; } +#if IS_ENABLED(CONFIG_DAX_DRIVER) +struct corrupted_hit_info { + struct dax_device *dax_dev; + sector_t offset; +}; + +static int dm_blk_corrupted_hit(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t count, void *data) +{ + struct corrupted_hit_info *bc = data; + + return bc->dax_dev == (void *)dev->dax_dev && + (start <= bc->offset && bc->offset < start + count); +} + +struct corrupted_do_info { + size_t length; + void *data; +}; + +static int dm_blk_corrupted_do(struct dm_target *ti, struct block_device *bdev, + sector_t sector, void *data) +{ + struct mapped_device *md = ti->table->md; + struct corrupted_do_info *bc = data; + + return dax_holder_notify_failure(md->dax_dev, to_bytes(sector), + bc->length, bc->data); +} + +static int dm_dax_notify_failure_one(struct mapped_device *md, + struct dax_device *dax_dev, + loff_t offset, size_t length, void *data) +{ + struct dm_table *map; + struct dm_target *ti; + sector_t sect = to_sector(offset); + struct corrupted_hit_info hi = {dax_dev, sect}; + struct corrupted_do_info di = {length, data}; + int srcu_idx, i, rc = -ENODEV; + + map = dm_get_live_table(md, &srcu_idx); + if (!map) + return rc; + + /* + * find the target device, and then translate the offset of this target + * to the whole mapped device. + */ + for (i = 0; i < dm_table_get_num_targets(map); i++) { + ti = dm_table_get_target(map, i); + if (!(ti->type->iterate_devices && ti->type->rmap)) + continue; + if (!ti->type->iterate_devices(ti, dm_blk_corrupted_hit, &hi)) + continue; + + rc = ti->type->rmap(ti, sect, dm_blk_corrupted_do, &di); + break; + } + + dm_put_live_table(md, srcu_idx); + return rc; +} + +static int dm_dax_notify_failure(struct dax_device *dax_dev, + loff_t offset, size_t length, void *data) +{ + struct dm_holder *holder; + struct list_head *holders = dax_get_holder(dax_dev); + int rc = -ENODEV; + + list_for_each_entry(holder, holders, list) { + rc = dm_dax_notify_failure_one(holder->md, dax_dev, offset, + length, data); + if (rc != -ENODEV) + break; + } + return rc; +} +#else +#define dm_dax_notify_failure NULL +#endif + /* * A target may call dm_accept_partial_bio only from the map routine. It is * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, @@ -3157,6 +3277,10 @@ static const struct dax_operations dm_dax_ops = { .zero_page_range = dm_dax_zero_page_range, }; +static const struct dax_holder_operations dm_dax_holder_ops = { + .notify_failure = dm_dax_notify_failure, +}; + /* * module hooks */