From patchwork Mon Jun 28 00:02:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347139 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 0D135C49EB7 for ; Mon, 28 Jun 2021 00:03:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 98E9361C35 for ; Mon, 28 Jun 2021 00:03:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 98E9361C35 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 ACE788D0008; Sun, 27 Jun 2021 20:03:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A7DBA6B007E; Sun, 27 Jun 2021 20:03:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8F7BD8D0008; Sun, 27 Jun 2021 20:03:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0064.hostedemail.com [216.40.44.64]) by kanga.kvack.org (Postfix) with ESMTP id 4779D6B0078 for ; Sun, 27 Jun 2021 20:03:00 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 31396181AEF31 for ; Mon, 28 Jun 2021 00:03:00 +0000 (UTC) X-FDA: 78301182120.24.DA60227 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf28.hostedemail.com (Postfix) with ESMTP id 576F62001096 for ; Mon, 28 Jun 2021 00:02:59 +0000 (UTC) IronPort-HdrOrdr: A9a23:GQqGlqmcPjC+AJqqUeStSZ1TRGzpDfLI3DAbv31ZSRFFG/Fxl6iV8sjzsiWE7gr5OUtQ4OxoV5PhfZqxz/JICMwqTNKftWrdyQyVxeNZnOjfKlTbckWUnINgPOVbAsxD4bbLbGSS4/yU3ODBKadD/DCYytHUuc7ui2dqURpxa7xtqyNwCgOgGEVwQwVcbKBJb6a0145WoSa6Y3QLYoCeDnkBZeLKoNrGj9bIehgDbiRXkjWmvHe57qLgCRiE0lM7WzNL+70r9m/IiEjYy8yYwomG9iM= X-IronPort-AV: E=Sophos;i="5.83,304,1616428800"; d="scan'208";a="110256322" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Jun 2021 08:02:57 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 3EC014D0BA67; Mon, 28 Jun 2021 08:02:54 +0800 (CST) Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Jun 2021 08:02:55 +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 08:02:54 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 1/9] pagemap: Introduce ->memory_failure() Date: Mon, 28 Jun 2021 08:02:10 +0800 Message-ID: <20210628000218.387833-2-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: 3EC014D0BA67.A1167 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Authentication-Results: imf28.hostedemail.com; dkim=none; spf=neutral (imf28.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-Stat-Signature: 1mhzko5s57a15zq363sui6qd3pmzjfdc X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 576F62001096 X-HE-Tag: 1624838579-691339 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: When memory-failure occurs, we call this function which is implemented by each kind of devices. For the fsdax case, pmem device driver implements it. Pmem device driver will find out the filesystem in which the corrupted page located in. And finally call filesystem handler to deal with this error. The filesystem will try to recover the corrupted data if necessary. Signed-off-by: Shiyang Ruan --- include/linux/memremap.h | 9 +++++++++ 1 file changed, 9 insertions(+) -- 2.32.0 diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 45a79da89c5f..d96da47cc249 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -87,6 +87,15 @@ struct dev_pagemap_ops { * the page back to a CPU accessible page. */ vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf); + + /* + * Handle the memory failure happens on a range of pfns. Notify the + * processes who are using these pfns, and try to recover the data on + * them if necessary. The flag is finally passed to the recover + * function through the whole notify routine. + */ + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, + unsigned long nr_pfns, int flags); }; #define PGMAP_ALTMAP_VALID (1 << 0) From patchwork Mon Jun 28 00:02:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347145 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 09A84C49EB7 for ; Mon, 28 Jun 2021 00:03:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B4B80619C4 for ; Mon, 28 Jun 2021 00:03:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B4B80619C4 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 2DFBC8D000C; Sun, 27 Jun 2021 20:03:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 26AFB8D000A; Sun, 27 Jun 2021 20:03:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F3A708D000C; Sun, 27 Jun 2021 20:03:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0144.hostedemail.com [216.40.44.144]) by kanga.kvack.org (Postfix) with ESMTP id B3D378D000A for ; Sun, 27 Jun 2021 20:03:05 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id A2A2518F75 for ; Mon, 28 Jun 2021 00:03:05 +0000 (UTC) X-FDA: 78301182330.22.5241ED1 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf01.hostedemail.com (Postfix) with ESMTP id B27B45001700 for ; Mon, 28 Jun 2021 00:03:04 +0000 (UTC) IronPort-HdrOrdr: A9a23:WJU4YKyumXfXlyQA26UeKrPwyr1zdoMgy1knxilNoRw8SK2lfqeV7Y0mPH7P+U4ssR4b6LO90cW7Lk80sKQFhbX5Xo3SOjUO2lHYTr2KhLGKq1aLdkHDH6xmpMBdmsNFaOEYY2IVsS+D2njcLz8/+qj6zImYwffZ02x2TRxnL4Vp7wJCAA6dFUFsLTM2f6YRJd6N4NZdvTq8dTAyZsS/PHMMWO/OvJnlj5TjCCR2eiIP2U2fiy+y8r7mH1y91hcaaTlGxrAv6izkvmXCl96ej80= X-IronPort-AV: E=Sophos;i="5.83,304,1616428800"; d="scan'208";a="110256332" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Jun 2021 08:03:03 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 3E44C4D0BA6A; Mon, 28 Jun 2021 08:03:01 +0800 (CST) Received: from G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Jun 2021 08:02:57 +0800 Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Jun 2021 08:02:56 +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 08:02:56 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 2/9] dax: Introduce holder for dax_device Date: Mon, 28 Jun 2021 08:02:11 +0800 Message-ID: <20210628000218.387833-3-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: 3E44C4D0BA6A.A2802 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Authentication-Results: imf01.hostedemail.com; dkim=none; spf=neutral (imf01.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-Stat-Signature: zh1zkowx7sp4r6e86pas8bez64jye7f8 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B27B45001700 X-HE-Tag: 1624838584-418804 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: To easily track filesystem from a pmem device, we introduce a holder for dax_device structure, and also its operation. This holder is used to remember who is using this dax_device: - When it is the backend of a filesystem, the holder will be the superblock of this filesystem. - When this pmem device is one of the targets in a mapped device, the holder will be this mapped device. In this case, the mapped device has its own dax_device and it will follow the first rule. So that we can finally track to the filesystem we needed. The holder and holder_ops will be set when filesystem is being mounted, or an target device is being activated. Signed-off-by: Shiyang Ruan --- drivers/dax/super.c | 49 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/dax.h | 17 ++++++++++++++++ 2 files changed, 66 insertions(+) -- 2.32.0 diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 5fa6ae9dbc8b..22f0aa3f2e13 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -222,8 +222,11 @@ struct dax_device { struct cdev cdev; const char *host; void *private; + struct rw_semaphore holder_rwsem; + void *holder_data; unsigned long flags; const struct dax_operations *ops; + const struct dax_holder_operations *holder_ops; }; static ssize_t write_cache_show(struct device *dev, @@ -373,6 +376,24 @@ int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, } EXPORT_SYMBOL_GPL(dax_zero_page_range); +int dax_holder_notify_failure(struct dax_device *dax_dev, loff_t offset, + size_t size, void *data) +{ + int rc = -ENXIO; + if (!dax_dev) + return rc; + + if (dax_dev->holder_data) { + rc = dax_dev->holder_ops->notify_failure(dax_dev, offset, + size, data); + if (rc == -ENODEV) + rc = -ENXIO; + } else + rc = -EOPNOTSUPP; + return rc; +} +EXPORT_SYMBOL_GPL(dax_holder_notify_failure); + #ifdef CONFIG_ARCH_HAS_PMEM_API void arch_wb_cache_pmem(void *addr, size_t size); void dax_flush(struct dax_device *dax_dev, void *addr, size_t size) @@ -603,6 +624,7 @@ struct dax_device *alloc_dax(void *private, const char *__host, dax_add_host(dax_dev, host); dax_dev->ops = ops; dax_dev->private = private; + init_rwsem(&dax_dev->holder_rwsem); if (flags & DAXDEV_F_SYNC) set_dax_synchronous(dax_dev); @@ -624,6 +646,33 @@ void put_dax(struct dax_device *dax_dev) } EXPORT_SYMBOL_GPL(put_dax); +void dax_set_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops) +{ + if (!dax_dev) + return; + down_write(&dax_dev->holder_rwsem); + dax_dev->holder_data = holder; + dax_dev->holder_ops = ops; + up_write(&dax_dev->holder_rwsem); +} +EXPORT_SYMBOL_GPL(dax_set_holder); + +void *dax_get_holder(struct dax_device *dax_dev) +{ + void *holder_data; + + if (!dax_dev) + return NULL; + + down_read(&dax_dev->holder_rwsem); + holder_data = dax_dev->holder_data; + up_read(&dax_dev->holder_rwsem); + + return holder_data; +} +EXPORT_SYMBOL_GPL(dax_get_holder); + /** * dax_get_by_host() - temporary lookup mechanism for filesystem-dax * @host: alternate name for the device registered by a dax driver diff --git a/include/linux/dax.h b/include/linux/dax.h index b52f084aa643..6f4b5c97ceb0 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -38,10 +38,17 @@ struct dax_operations { int (*zero_page_range)(struct dax_device *, pgoff_t, size_t); }; +struct dax_holder_operations { + int (*notify_failure)(struct dax_device *, loff_t, size_t, void *); +}; + extern struct attribute_group dax_attribute_group; #if IS_ENABLED(CONFIG_DAX) struct dax_device *dax_get_by_host(const char *host); +void dax_set_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops); +void *dax_get_holder(struct dax_device *dax_dev); struct dax_device *alloc_dax(void *private, const char *host, const struct dax_operations *ops, unsigned long flags); void put_dax(struct dax_device *dax_dev); @@ -77,6 +84,14 @@ static inline struct dax_device *dax_get_by_host(const char *host) { return NULL; } +static inline void dax_set_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops) +{ +} +static inline void *dax_get_holder(struct dax_device *dax_dev) +{ + return NULL; +} static inline struct dax_device *alloc_dax(void *private, const char *host, const struct dax_operations *ops, unsigned long flags) { @@ -226,6 +241,8 @@ size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, size_t nr_pages); +int dax_holder_notify_failure(struct dax_device *dax_dev, loff_t offset, + size_t size, void *data); void dax_flush(struct dax_device *dax_dev, void *addr, size_t size); ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, From patchwork Mon Jun 28 00:02:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347143 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 B75DFC48BC2 for ; Mon, 28 Jun 2021 00:03:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 504C1619F1 for ; Mon, 28 Jun 2021 00:03:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 504C1619F1 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 920F08D000B; Sun, 27 Jun 2021 20:03:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 883278D000A; Sun, 27 Jun 2021 20:03:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 688258D000B; Sun, 27 Jun 2021 20:03:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0112.hostedemail.com [216.40.44.112]) by kanga.kvack.org (Postfix) with ESMTP id 2DE908D000A for ; Sun, 27 Jun 2021 20:03:05 -0400 (EDT) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1D272180ACF8F for ; Mon, 28 Jun 2021 00:03:05 +0000 (UTC) X-FDA: 78301182330.29.AFB0696 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf28.hostedemail.com (Postfix) with ESMTP id ACBB8200107A for ; Mon, 28 Jun 2021 00:03:03 +0000 (UTC) IronPort-HdrOrdr: A9a23:iGjbsqx6BG84dbzVRShwKrPwEL1zdoMgy1knxilNoH1uA6ilfqWV8cjzuiWbtN9vYhsdcLy7WZVoIkmskKKdg7NhXotKNTOO0ASVxepZnOnfKlPbexHWx6p00KdMV+xEAsTsMF4St63HyTj9P9E+4NTvysyVuds= X-IronPort-AV: E=Sophos;i="5.83,304,1616428800"; d="scan'208";a="110256333" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Jun 2021 08:03:03 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id C6F2D4D0BA6C; Mon, 28 Jun 2021 08:03:01 +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 08:02:56 +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 08:02:57 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 3/9] mm: factor helpers for memory_failure_dev_pagemap Date: Mon, 28 Jun 2021 08:02:12 +0800 Message-ID: <20210628000218.387833-4-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: C6F2D4D0BA6C.A37B2 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Authentication-Results: imf28.hostedemail.com; dkim=none; spf=neutral (imf28.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-Stat-Signature: 9cgsmfeb1kqo8eehiwuprj66g51kgt6g X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: ACBB8200107A X-HE-Tag: 1624838583-991920 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: memory_failure_dev_pagemap code is a bit complex before introduce RMAP feature for fsdax. So it is needed to factor some helper functions to simplify these code. Signed-off-by: Shiyang Ruan --- mm/memory-failure.c | 101 +++++++++++++++++++++++++------------------- 1 file changed, 57 insertions(+), 44 deletions(-) -- 2.32.0 diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 0143d32bc666..068753911946 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1243,6 +1243,60 @@ static int try_to_split_thp_page(struct page *page, const char *msg) return 0; } +static void unmap_and_kill(struct list_head *to_kill, unsigned long pfn, + struct address_space *mapping, pgoff_t index, int flags) +{ + struct to_kill *tk; + unsigned long size = 0; + + list_for_each_entry(tk, to_kill, nd) + if (tk->size_shift) + size = max(size, 1UL << tk->size_shift); + if (size) { + /* + * Unmap the largest mapping to avoid breaking up device-dax + * mappings which are constant size. The actual size of the + * mapping being torn down is communicated in siginfo, see + * kill_proc() + */ + loff_t start = (index << PAGE_SHIFT) & ~(size - 1); + + unmap_mapping_range(mapping, start, size, 0); + } + + kill_procs(to_kill, flags & MF_MUST_KILL, false, pfn, flags); +} + +static int mf_generic_kill_procs(unsigned long long pfn, int flags) +{ + struct page *page = pfn_to_page(pfn); + LIST_HEAD(to_kill); + dax_entry_t cookie; + + /* + * Prevent the inode from being freed while we are interrogating + * the address_space, typically this would be handled by + * lock_page(), but dax pages do not use the page lock. This + * also prevents changes to the mapping of this pfn until + * poison signaling is complete. + */ + cookie = dax_lock_page(page); + if (!cookie) + return -EBUSY; + /* + * Unlike System-RAM there is no possibility to swap in a + * different physical page at a given virtual address, so all + * userspace consumption of ZONE_DEVICE memory necessitates + * SIGBUS (i.e. MF_MUST_KILL) + */ + flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + collect_procs(page, &to_kill, flags & MF_ACTION_REQUIRED); + + unmap_and_kill(&to_kill, pfn, page->mapping, page->index, flags); + dax_unlock_page(page, cookie); + return 0; +} + static int memory_failure_hugetlb(unsigned long pfn, int flags) { struct page *p = pfn_to_page(pfn); @@ -1323,13 +1377,8 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, struct dev_pagemap *pgmap) { struct page *page = pfn_to_page(pfn); - const bool unmap_success = true; - unsigned long size = 0; - struct to_kill *tk; LIST_HEAD(tokill); int rc = -EBUSY; - loff_t start; - dax_entry_t cookie; if (flags & MF_COUNT_INCREASED) /* @@ -1343,20 +1392,9 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, goto out; } - /* - * Prevent the inode from being freed while we are interrogating - * the address_space, typically this would be handled by - * lock_page(), but dax pages do not use the page lock. This - * also prevents changes to the mapping of this pfn until - * poison signaling is complete. - */ - cookie = dax_lock_page(page); - if (!cookie) - goto out; - if (hwpoison_filter(page)) { rc = 0; - goto unlock; + goto out; } if (pgmap->type == MEMORY_DEVICE_PRIVATE) { @@ -1364,7 +1402,7 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, * TODO: Handle HMM pages which may need coordination * with device-side memory. */ - goto unlock; + goto out; } /* @@ -1373,32 +1411,7 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, */ SetPageHWPoison(page); - /* - * Unlike System-RAM there is no possibility to swap in a - * different physical page at a given virtual address, so all - * userspace consumption of ZONE_DEVICE memory necessitates - * SIGBUS (i.e. MF_MUST_KILL) - */ - flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; - collect_procs(page, &tokill, flags & MF_ACTION_REQUIRED); - - list_for_each_entry(tk, &tokill, nd) - if (tk->size_shift) - size = max(size, 1UL << tk->size_shift); - if (size) { - /* - * Unmap the largest mapping to avoid breaking up - * device-dax mappings which are constant size. The - * actual size of the mapping being torn down is - * communicated in siginfo, see kill_proc() - */ - start = (page->index << PAGE_SHIFT) & ~(size - 1); - unmap_mapping_range(page->mapping, start, size, 0); - } - kill_procs(&tokill, flags & MF_MUST_KILL, !unmap_success, pfn, flags); - rc = 0; -unlock: - dax_unlock_page(page, cookie); + mf_generic_kill_procs(pfn, flags); out: /* drop pgmap ref acquired in caller */ put_dev_pagemap(pgmap); From patchwork Mon Jun 28 00:02:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347147 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 084C6C48BC2 for ; Mon, 28 Jun 2021 00:03:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9C6D2619F1 for ; Mon, 28 Jun 2021 00:03:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9C6D2619F1 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 DDC478D000F; Sun, 27 Jun 2021 20:03:12 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D8B288D000E; Sun, 27 Jun 2021 20:03:12 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BDEB68D000F; Sun, 27 Jun 2021 20:03:12 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0220.hostedemail.com [216.40.44.220]) by kanga.kvack.org (Postfix) with ESMTP id 8B8678D000E for ; Sun, 27 Jun 2021 20:03:12 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 8B409180ACF8B for ; Mon, 28 Jun 2021 00:03:12 +0000 (UTC) X-FDA: 78301182624.13.C76DAAC Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf18.hostedemail.com (Postfix) with ESMTP id BFA34200106B for ; Mon, 28 Jun 2021 00:03:11 +0000 (UTC) IronPort-HdrOrdr: A9a23:bto2uqlRFa+Gnj9UhRGuFKoF6UHpDfIQ3DAbv31ZSRFFG/Fw9vre+MjzsCWYtN9/Yh8dcK+7UpVoLUm8yXcX2/h1AV7BZniEhILAFugLgrcKqAeQeREWmNQ86Y5QN4B6CPDVSWNxlNvG5mCDeOoI8Z2q97+JiI7lo0tQcQ== X-IronPort-AV: E=Sophos;i="5.83,304,1616428800"; d="scan'208";a="110256345" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Jun 2021 08:03:10 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 237344D0BA7B; Mon, 28 Jun 2021 08:03:08 +0800 (CST) Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Jun 2021 08:03:04 +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 08:03:03 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 4/9] pmem,mm: Implement ->memory_failure in pmem driver Date: Mon, 28 Jun 2021 08:02:13 +0800 Message-ID: <20210628000218.387833-5-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: 237344D0BA7B.A1C39 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: BFA34200106B X-Stat-Signature: toxxpkntfkqynex7nhjurz8fdqh6oxge 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: 1624838591-996720 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: With dax_holder notify support, we are able to notify the memory failure from pmem driver to upper layers. If there is something not support in the notify routine, memory_failure will fall back to the generic hanlder. Signed-off-by: Shiyang Ruan --- drivers/nvdimm/pmem.c | 13 +++++++++++++ mm/memory-failure.c | 14 ++++++++++++++ 2 files changed, 27 insertions(+) -- 2.32.0 diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index ed10a8b66068..95d79dfb2fc2 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -364,9 +364,22 @@ static void pmem_release_disk(void *__pmem) put_disk(pmem->disk); } +static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, + unsigned long pfn, unsigned long nr_pfns, int flags) +{ + struct pmem_device *pmem = + container_of(pgmap, struct pmem_device, pgmap); + loff_t offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; + + return dax_holder_notify_failure(pmem->dax_dev, offset, + page_size(pfn_to_page(pfn)) * nr_pfns, + &flags); +} + static const struct dev_pagemap_ops fsdax_pagemap_ops = { .kill = pmem_pagemap_kill, .cleanup = pmem_pagemap_cleanup, + .memory_failure = pmem_pagemap_memory_failure, }; static int pmem_attach_disk(struct device *dev, diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 068753911946..30ce1e653c0a 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1411,6 +1411,20 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags, */ SetPageHWPoison(page); + /* + * Call driver's implementation to handle the memory failure, otherwise + * fall back to generic handler. + */ + if (pgmap->ops->memory_failure) { + rc = pgmap->ops->memory_failure(pgmap, pfn, 1, flags); + /* + * Fall back to generic handler too if operation is not + * supported inside the driver/device/filesystem. + */ + if (rc != EOPNOTSUPP) + goto out; + } + mf_generic_kill_procs(pfn, flags); out: /* drop pgmap ref acquired in caller */ From patchwork Mon Jun 28 00:02:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347149 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 B16C1C49EB7 for ; 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Mon, 28 Jun 2021 08:03:09 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 5/9] mm: Introduce mf_dax_kill_procs() for fsdax case Date: Mon, 28 Jun 2021 08:02:14 +0800 Message-ID: <20210628000218.387833-6-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: 4BA114D0C4CE.A47F0 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0389A2001094 X-Stat-Signature: yq7n3by56te9f54oqcdfyywdi6inrdfg 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: 1624838592-982538 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 function is called at the end of RMAP routine, i.e. filesystem recovery function. The difference between mf_generic_kill_procs() is, mf_dax_kill_procs() accepts file mapping and offset instead of struct page. It is because that different file mappings and offsets may share the same page in fsdax mode. So, it is called when filesystem RMAP results are found. Signed-off-by: Shiyang Ruan Reported-by: kernel test robot --- fs/dax.c | 31 +++++++++++++++-------- include/linux/dax.h | 10 ++++++++ include/linux/mm.h | 10 ++++++++ mm/memory-failure.c | 60 +++++++++++++++++++++++++++++++++------------ 4 files changed, 85 insertions(+), 26 deletions(-) -- 2.32.0 diff --git a/fs/dax.c b/fs/dax.c index 62352cbcf0f4..7c5d8acd6bc5 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -389,6 +389,27 @@ static struct page *dax_busy_page(void *entry) return NULL; } +/* + * dax_load_pfn - Load pfn of the DAX entry corresponding to a page + * @mapping: The file whose entry we want to load + * @index: offset where the DAX entry located in + * + * Return: pfn number of the DAX entry + */ +unsigned long dax_load_pfn(struct address_space *mapping, unsigned long index) +{ + XA_STATE(xas, &mapping->i_pages, index); + void *entry; + unsigned long pfn; + + xas_lock_irq(&xas); + entry = xas_load(&xas); + pfn = dax_to_pfn(entry); + xas_unlock_irq(&xas); + + return pfn; +} + /* * dax_lock_mapping_entry - Lock the DAX entry corresponding to a page * @page: The page whose entry we want to lock @@ -789,16 +810,6 @@ static void *dax_insert_entry(struct xa_state *xas, return entry; } -static inline -unsigned long pgoff_address(pgoff_t pgoff, struct vm_area_struct *vma) -{ - unsigned long address; - - address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); - VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); - return address; -} - /* Walk all mappings of a given index of a file and writeprotect them */ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index, unsigned long pfn) diff --git a/include/linux/dax.h b/include/linux/dax.h index 6f4b5c97ceb0..fc0c80f09b79 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -165,6 +165,7 @@ int dax_writeback_mapping_range(struct address_space *mapping, struct page *dax_layout_busy_page(struct address_space *mapping); struct page *dax_layout_busy_page_range(struct address_space *mapping, loff_t start, loff_t end); +unsigned long dax_load_pfn(struct address_space *mapping, unsigned long index); dax_entry_t dax_lock_page(struct page *page); void dax_unlock_page(struct page *page, dax_entry_t cookie); #else @@ -259,6 +260,15 @@ static inline bool dax_mapping(struct address_space *mapping) { return mapping->host && IS_DAX(mapping->host); } +static inline unsigned long pgoff_address(pgoff_t pgoff, + struct vm_area_struct *vma) +{ + unsigned long address; + + address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); + VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); + return address; +} #ifdef CONFIG_DEV_DAX_HMEM_DEVICES void hmem_register_device(int target_nid, struct resource *r); diff --git a/include/linux/mm.h b/include/linux/mm.h index 8ae31622deef..3f101caec30e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1187,6 +1187,14 @@ static inline bool is_device_private_page(const struct page *page) page->pgmap->type == MEMORY_DEVICE_PRIVATE; } +static inline bool is_device_fsdax_page(const struct page *page) +{ + return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) && + IS_ENABLED(CONFIG_FS_DAX) && + is_zone_device_page(page) && + page->pgmap->type == MEMORY_DEVICE_FS_DAX; +} + static inline bool is_pci_p2pdma_page(const struct page *page) { return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) && @@ -3081,6 +3089,8 @@ enum mf_flags { MF_MUST_KILL = 1 << 2, MF_SOFT_OFFLINE = 1 << 3, }; +extern int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, + int flags); extern int memory_failure(unsigned long pfn, int flags); extern void memory_failure_queue(unsigned long pfn, int flags); extern void memory_failure_queue_kick(int cpu); diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 30ce1e653c0a..37ac15b223e0 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -120,6 +120,12 @@ static int hwpoison_filter_dev(struct page *p) if (PageSlab(p)) return -EINVAL; + if (pfn_valid(page_to_pfn(p))) { + if (is_device_fsdax_page(p)) + return 0; + } else + return -EINVAL; + mapping = page_mapping(p); if (mapping == NULL || mapping->host == NULL) return -EINVAL; @@ -290,10 +296,9 @@ void shake_page(struct page *p, int access) } EXPORT_SYMBOL_GPL(shake_page); -static unsigned long dev_pagemap_mapping_shift(struct page *page, +static unsigned long dev_pagemap_mapping_shift(unsigned long address, struct vm_area_struct *vma) { - unsigned long address = vma_address(page, vma); pgd_t *pgd; p4d_t *p4d; pud_t *pud; @@ -333,7 +338,7 @@ static unsigned long dev_pagemap_mapping_shift(struct page *page, * Schedule a process for later kill. * Uses GFP_ATOMIC allocations to avoid potential recursions in the VM. */ -static void add_to_kill(struct task_struct *tsk, struct page *p, +static void add_to_kill(struct task_struct *tsk, struct page *p, pgoff_t pgoff, struct vm_area_struct *vma, struct list_head *to_kill) { @@ -346,9 +351,14 @@ static void add_to_kill(struct task_struct *tsk, struct page *p, } tk->addr = page_address_in_vma(p, vma); - if (is_zone_device_page(p)) - tk->size_shift = dev_pagemap_mapping_shift(p, vma); - else + if (is_zone_device_page(p)) { + /* Since page->mapping is no more used for fsdax, we should + * calculate the address in a fsdax way. + */ + if (is_device_fsdax_page(p)) + tk->addr = pgoff_address(pgoff, vma); + tk->size_shift = dev_pagemap_mapping_shift(tk->addr, vma); + } else tk->size_shift = page_shift(compound_head(p)); /* @@ -496,7 +506,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill, if (!page_mapped_in_vma(page, vma)) continue; if (vma->vm_mm == t->mm) - add_to_kill(t, page, vma, to_kill); + add_to_kill(t, page, 0, vma, to_kill); } } read_unlock(&tasklist_lock); @@ -506,24 +516,20 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill, /* * Collect processes when the error hit a file mapped page. */ -static void collect_procs_file(struct page *page, struct list_head *to_kill, - int force_early) +static void collect_procs_file(struct page *page, struct address_space *mapping, + pgoff_t pgoff, struct list_head *to_kill, int force_early) { struct vm_area_struct *vma; struct task_struct *tsk; - struct address_space *mapping = page->mapping; - pgoff_t pgoff; i_mmap_lock_read(mapping); read_lock(&tasklist_lock); - pgoff = page_to_pgoff(page); for_each_process(tsk) { struct task_struct *t = task_early_kill(tsk, force_early); if (!t) continue; - vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, - pgoff) { + vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) { /* * Send early kill signal to tasks where a vma covers * the page but the corrupted page is not necessarily @@ -532,7 +538,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill, * to be informed of all such data corruptions. */ if (vma->vm_mm == t->mm) - add_to_kill(t, page, vma, to_kill); + add_to_kill(t, page, pgoff, vma, to_kill); } } read_unlock(&tasklist_lock); @@ -551,7 +557,8 @@ static void collect_procs(struct page *page, struct list_head *tokill, if (PageAnon(page)) collect_procs_anon(page, tokill, force_early); else - collect_procs_file(page, tokill, force_early); + collect_procs_file(page, page->mapping, page->index, tokill, + force_early); } static const char *action_name[] = { @@ -1297,6 +1304,27 @@ static int mf_generic_kill_procs(unsigned long long pfn, int flags) return 0; } +int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, int flags) +{ + LIST_HEAD(to_kill); + /* load the pfn of the dax mapping file */ + unsigned long pfn = dax_load_pfn(mapping, index); + + /* + * Unlike System-RAM there is no possibility to swap in a + * different physical page at a given virtual address, so all + * userspace consumption of ZONE_DEVICE memory necessitates + * SIGBUS (i.e. MF_MUST_KILL) + */ + flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + collect_procs_file(pfn_to_page(pfn), mapping, index, &to_kill, + flags & MF_ACTION_REQUIRED); + + unmap_and_kill(&to_kill, pfn, mapping, index, flags); + return 0; +} +EXPORT_SYMBOL_GPL(mf_dax_kill_procs); + static int memory_failure_hugetlb(unsigned long pfn, int flags) { struct page *p = pfn_to_page(pfn); From patchwork Mon Jun 28 00:02:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347153 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 1C574C48BC2 for ; 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Mon, 28 Jun 2021 08:03:11 +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 08:03:11 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 6/9] xfs: Implement ->corrupted_range() for XFS Date: Mon, 28 Jun 2021 08:02:15 +0800 Message-ID: <20210628000218.387833-7-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: 545984D0C4C1.AFA98 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 7932A20010A2 X-Stat-Signature: ssbe8sn6xawkf375xbdsf38qzz4eud4r 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: 1624838602-229149 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 function is used to handle errors which may cause data lost in filesystem. Such as memory failure in fsdax mode. If the rmap feature of XFS enabled, we can query it to find files and metadata which are associated with the corrupt data. For now all we do is kill processes with that file mapped into their address spaces, but future patches could actually do something about corrupt metadata. After that, the memory failure needs to notify the processes who are using those files. Only support data device. Realtime device is not supported for now. Signed-off-by: Shiyang Ruan Reported-by: kernel test robot Reported-by: kernel test robot --- fs/xfs/xfs_fsops.c | 5 ++ fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_super.c | 140 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 146 insertions(+) -- 2.32.0 diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index be9cf88d2ad7..e89ada33d8fc 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -551,6 +551,11 @@ xfs_do_force_shutdown( "Corruption of in-memory data detected. Shutting down filesystem"); if (XFS_ERRLEVEL_HIGH <= xfs_error_level) xfs_stack_trace(); + } else if (flags & SHUTDOWN_CORRUPT_META) { + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, +"Corruption of on-disk metadata detected. Shutting down filesystem"); + if (XFS_ERRLEVEL_HIGH <= xfs_error_level) + xfs_stack_trace(); } else if (logerror) { xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, "Log I/O Error Detected. Shutting down filesystem"); diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index bb67274ee23f..c62ccf3e07d0 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -276,6 +276,7 @@ void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ +#define SHUTDOWN_CORRUPT_META 0x0010 /* corrupt metadata on device */ /* * Flags for xfs_mountfs diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index a2dab05332ac..a986ddf3b248 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -36,11 +36,18 @@ #include "xfs_bmap_item.h" #include "xfs_reflink.h" #include "xfs_pwork.h" +#include "xfs_alloc.h" +#include "xfs_rmap.h" +#include "xfs_rmap_btree.h" +#include "xfs_rtalloc.h" +#include "xfs_bit.h" #include #include #include +#include +static const struct dax_holder_operations xfs_dax_holder_operations; static const struct super_operations xfs_super_operations; static struct kset *xfs_kset; /* top-level xfs sysfs dir */ @@ -358,6 +365,7 @@ xfs_close_devices( xfs_free_buftarg(mp->m_logdev_targp); xfs_blkdev_put(logdev); + dax_set_holder(dax_logdev, NULL, NULL); fs_put_dax(dax_logdev); } if (mp->m_rtdev_targp) { @@ -366,9 +374,11 @@ xfs_close_devices( xfs_free_buftarg(mp->m_rtdev_targp); xfs_blkdev_put(rtdev); + dax_set_holder(dax_rtdev, NULL, NULL); fs_put_dax(dax_rtdev); } xfs_free_buftarg(mp->m_ddev_targp); + dax_set_holder(dax_ddev, NULL, NULL); fs_put_dax(dax_ddev); } @@ -392,6 +402,7 @@ xfs_open_devices( struct block_device *logdev = NULL, *rtdev = NULL; int error; + dax_set_holder(dax_ddev, mp, &xfs_dax_holder_operations); /* * Open real time and log devices - order is important. */ @@ -400,6 +411,9 @@ xfs_open_devices( if (error) goto out; dax_logdev = fs_dax_get_by_bdev(logdev); + if (dax_logdev != dax_ddev) + dax_set_holder(dax_logdev, mp, + &xfs_dax_holder_operations); } if (mp->m_rtname) { @@ -414,6 +428,7 @@ xfs_open_devices( goto out_close_rtdev; } dax_rtdev = fs_dax_get_by_bdev(rtdev); + dax_set_holder(dax_rtdev, mp, &xfs_dax_holder_operations); } /* @@ -1076,6 +1091,131 @@ xfs_fs_free_cached_objects( return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); } +static int +xfs_corrupt_helper( + struct xfs_btree_cur *cur, + struct xfs_rmap_irec *rec, + void *data) +{ + struct xfs_inode *ip; + struct address_space *mapping; + int error = 0; + int *flags = data; + + if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || + (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { + // TODO check and try to fix metadata + xfs_force_shutdown(cur->bc_mp, SHUTDOWN_CORRUPT_META); + return -EFSCORRUPTED; + } + + /* + * Get files that incore, filter out others that are not in use. + */ + error = xfs_iget(cur->bc_mp, cur->bc_tp, rec->rm_owner, XFS_IGET_INCORE, + 0, &ip); + if (error) + return error; + + mapping = VFS_I(ip)->i_mapping; + +#ifdef CONFIG_MEMORY_FAILURE + error = mf_dax_kill_procs(mapping, rec->rm_offset, *flags); +#endif + + // TODO try to fix data + xfs_irele(ip); + + return error; +} + +static loff_t +xfs_dax_bdev_offset( + struct xfs_mount *mp, + struct dax_device *dax_dev, + loff_t disk_offset) +{ + struct block_device *bdev; + + if (mp->m_ddev_targp->bt_daxdev == dax_dev) + bdev = mp->m_ddev_targp->bt_bdev; + else if (mp->m_logdev_targp->bt_daxdev == dax_dev) + bdev = mp->m_logdev_targp->bt_bdev; + else + bdev = mp->m_rtdev_targp->bt_bdev; + + return disk_offset - (get_start_sect(bdev) << SECTOR_SHIFT); +} + +static int +xfs_dax_notify_failure( + struct dax_device *dax_dev, + loff_t offset, + size_t len, + void *data) +{ + struct xfs_mount *mp = dax_get_holder(dax_dev); + struct xfs_trans *tp = NULL; + struct xfs_btree_cur *cur = NULL; + struct xfs_buf *agf_bp = NULL; + struct xfs_rmap_irec rmap_low, rmap_high; + loff_t bdev_offset = xfs_dax_bdev_offset(mp, dax_dev, + offset); + xfs_fsblock_t fsbno = XFS_B_TO_FSB(mp, bdev_offset); + xfs_filblks_t bcnt = XFS_B_TO_FSB(mp, len); + xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno); + xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, fsbno); + int error = 0; + + pr_warn("%s bno: %lld\n", __func__, bdev_offset >> SECTOR_SHIFT); + + if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { + xfs_warn(mp, "corrupted_range support not available for realtime device!"); + return -EOPNOTSUPP; + } + if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && + mp->m_logdev_targp != mp->m_ddev_targp) { + xfs_err(mp, "ondisk log corrupt, shutting down fs!"); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_META); + return -EFSCORRUPTED; + } + + if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) { + xfs_warn(mp, "corrupted_range needs rmapbt enabled!"); + return -EOPNOTSUPP; + } + + error = xfs_trans_alloc_empty(mp, &tp); + if (error) + return error; + + error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp); + if (error) + goto out_cancel_tp; + + cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, agno); + + /* Construct a range for rmap query */ + memset(&rmap_low, 0, sizeof(rmap_low)); + memset(&rmap_high, 0xFF, sizeof(rmap_high)); + rmap_low.rm_startblock = rmap_high.rm_startblock = agbno; + rmap_low.rm_blockcount = rmap_high.rm_blockcount = bcnt; + + error = xfs_rmap_query_range(cur, &rmap_low, &rmap_high, + xfs_corrupt_helper, data); + + xfs_btree_del_cursor(cur, error); + xfs_trans_brelse(tp, agf_bp); + +out_cancel_tp: + xfs_trans_cancel(tp); + return error; +} + +static const struct dax_holder_operations xfs_dax_holder_operations = { + .notify_failure = xfs_dax_notify_failure, +}; + static const struct super_operations xfs_super_operations = { .alloc_inode = xfs_fs_alloc_inode, .destroy_inode = xfs_fs_destroy_inode, From patchwork Mon Jun 28 00:02:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347151 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 85EFDC49EAF for ; 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Mon, 28 Jun 2021 08:03:12 +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 08:03:12 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 7/9] dm: Introduce ->rmap() to find bdev offset Date: Mon, 28 Jun 2021 08:02:16 +0800 Message-ID: <20210628000218.387833-8-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: 862014C36A09.AF525 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1D37E200107C X-Stat-Signature: eg6cj4uik7p5ki557yg4rf9c369wproj 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: 1624838595-951353 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: Pmem device could be a target of mapped device. In order to find out the global location on a mapped device, we introduce this to translate offset from target device to mapped device. Currently, we implement it on linear target, which is easy to do the translation. Other targets will be supported in the future. However, some targets may not support it because of the non-linear mapping. Signed-off-by: Shiyang Ruan --- block/genhd.c | 30 ++++++++++++++++++++++++++++++ drivers/md/dm-linear.c | 20 ++++++++++++++++++++ include/linux/device-mapper.h | 5 +++++ include/linux/genhd.h | 1 + 4 files changed, 56 insertions(+) -- 2.32.0 diff --git a/block/genhd.c b/block/genhd.c index 9f8cb7beaad1..75834bd057df 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -718,6 +718,36 @@ struct block_device *bdget_disk(struct gendisk *disk, int partno) return bdev; } +/** + * bdget_disk_sector - get block device by given sector number + * @disk: gendisk of interest + * @sector: sector number + * + * RETURNS: the found block device where sector locates in + */ +struct block_device *bdget_disk_sector(struct gendisk *disk, sector_t sector) +{ + struct block_device *part = NULL, *p; + unsigned long idx; + + rcu_read_lock(); + xa_for_each(&disk->part_tbl, idx, p) { + if (p->bd_partno == 0) + continue; + if (p->bd_start_sect <= sector && + sector < p->bd_start_sect + bdev_nr_sectors(p)) { + part = p; + break; + } + } + rcu_read_unlock(); + if (!part) + part = disk->part0; + + return bdget_disk(disk, part->bd_partno); +} +EXPORT_SYMBOL(bdget_disk_sector); + /* * print a full list of all partitions - intended for places where the root * filesystem can't be mounted and thus to give the victim some idea of what diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 92db0f5e7f28..f9f9bc765ba7 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -5,6 +5,7 @@ */ #include "dm.h" +#include "dm-core.h" #include #include #include @@ -119,6 +120,24 @@ static void linear_status(struct dm_target *ti, status_type_t type, } } +static int linear_rmap(struct dm_target *ti, sector_t offset, + rmap_callout_fn fn, void *data) +{ + struct linear_c *lc = (struct linear_c *) ti->private; + struct mapped_device *md = ti->table->md; + struct block_device *bdev; + sector_t disk_sect = offset - dm_target_offset(ti, lc->start); + int rc = -ENODEV; + + bdev = bdget_disk_sector(md->disk, offset); + if (!bdev) + return rc; + + rc = fn(ti, bdev, disk_sect, data); + bdput(bdev); + return rc; +} + static int linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev) { struct linear_c *lc = (struct linear_c *) ti->private; @@ -236,6 +255,7 @@ static struct target_type linear_target = { .ctr = linear_ctr, .dtr = linear_dtr, .map = linear_map, + .rmap = linear_rmap, .status = linear_status, .prepare_ioctl = linear_prepare_ioctl, .iterate_devices = linear_iterate_devices, diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index ff700fb6ce1d..89a893565407 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -58,6 +58,10 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti); * = 2: The target wants to push back the io */ typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); +typedef int (*rmap_callout_fn) (struct dm_target *ti, struct block_device *bdev, + sector_t sect, void *data); +typedef int (*dm_rmap_fn) (struct dm_target *ti, sector_t offset, + rmap_callout_fn fn, void *data); typedef int (*dm_clone_and_map_request_fn) (struct dm_target *ti, struct request *rq, union map_info *map_context, @@ -184,6 +188,7 @@ struct target_type { dm_ctr_fn ctr; dm_dtr_fn dtr; dm_map_fn map; + dm_rmap_fn rmap; dm_clone_and_map_request_fn clone_and_map_rq; dm_release_clone_request_fn release_clone_rq; dm_endio_fn end_io; diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 6fc26f7bdf71..2ad70c02c343 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -219,6 +219,7 @@ static inline void add_disk_no_queue_reg(struct gendisk *disk) extern void del_gendisk(struct gendisk *gp); extern struct block_device *bdget_disk(struct gendisk *disk, int partno); +extern struct block_device *bdget_disk_sector(struct gendisk *disk, sector_t sector); void set_disk_ro(struct gendisk *disk, bool read_only); 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 ; 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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 */ From patchwork Mon Jun 28 00:02:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12347157 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 76094C49EA6 for ; Mon, 28 Jun 2021 00:03:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 25BB261C17 for ; Mon, 28 Jun 2021 00:03:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 25BB261C17 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 022108D0018; Sun, 27 Jun 2021 20:03:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D3D588D0016; 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 B40B18D0018; Sun, 27 Jun 2021 20:03:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0041.hostedemail.com [216.40.44.41]) by kanga.kvack.org (Postfix) with ESMTP id 828078D0016 for ; Sun, 27 Jun 2021 20:03:30 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 764D9824999B for ; Mon, 28 Jun 2021 00:03:30 +0000 (UTC) X-FDA: 78301183380.20.FD0A705 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf15.hostedemail.com (Postfix) with ESMTP id B6140A000247 for ; Mon, 28 Jun 2021 00:03:29 +0000 (UTC) IronPort-HdrOrdr: A9a23:9Se1iaFrOT7Xo9FfpLqEDseALOsnbusQ8zAXP0AYc31om6uj5rmTdZUgpGfJYVkqKRIdcLy7V5VoBEmskaKdgrNhW4tKPjOW2ldARbsKheCJrlHd8m/Fh4lgPMxbE5SWZuefMbEDt7ee3OCnKadd/PC3tLCvmfzFz2pgCSVja6Rb5Q9/DQqBe3cGPjVuNN4oEoaG/Mpbq36FcXQTVM6yAX4IRKztvNvO/aiWHCIuNlo27hWUlzO05PrfGxic5B0XVDRC2vMD3AH+4nfE2pk= X-IronPort-AV: E=Sophos;i="5.83,304,1616428800"; d="scan'208";a="110256401" 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 G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 11E524D0BA6A; Mon, 28 Jun 2021 08:03:24 +0800 (CST) Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 28 Jun 2021 08:03:25 +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 08:03:24 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , , Subject: [PATCH v5 9/9] fs/dax: Remove useless functions Date: Mon, 28 Jun 2021 08:02:18 +0800 Message-ID: <20210628000218.387833-10-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: 11E524D0BA6A.A3DAF X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Authentication-Results: imf15.hostedemail.com; dkim=none; spf=neutral (imf15.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-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B6140A000247 X-Stat-Signature: uhh4o5ztwm3a5pt6hmwis7oy5hh58or8 X-HE-Tag: 1624838609-296041 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: Since owner tracking is triggerred by pmem device, these functions are useless. So remove them. Signed-off-by: Shiyang Ruan --- fs/dax.c | 46 ---------------------------------------------- 1 file changed, 46 deletions(-) -- 2.32.0 diff --git a/fs/dax.c b/fs/dax.c index 7c5d8acd6bc5..cee8e61d1025 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -334,48 +334,6 @@ static unsigned long dax_end_pfn(void *entry) for (pfn = dax_to_pfn(entry); \ pfn < dax_end_pfn(entry); pfn++) -/* - * TODO: for reflink+dax we need a way to associate a single page with - * multiple address_space instances at different linear_page_index() - * offsets. - */ -static void dax_associate_entry(void *entry, struct address_space *mapping, - struct vm_area_struct *vma, unsigned long address) -{ - unsigned long size = dax_entry_size(entry), pfn, index; - int i = 0; - - if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) - return; - - index = linear_page_index(vma, address & ~(size - 1)); - for_each_mapped_pfn(entry, pfn) { - struct page *page = pfn_to_page(pfn); - - WARN_ON_ONCE(page->mapping); - page->mapping = mapping; - page->index = index + i++; - } -} - -static void dax_disassociate_entry(void *entry, struct address_space *mapping, - bool trunc) -{ - unsigned long pfn; - - if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) - return; - - for_each_mapped_pfn(entry, pfn) { - struct page *page = pfn_to_page(pfn); - - WARN_ON_ONCE(trunc && page_ref_count(page) > 1); - WARN_ON_ONCE(page->mapping && page->mapping != mapping); - page->mapping = NULL; - page->index = 0; - } -} - static struct page *dax_busy_page(void *entry) { unsigned long pfn; @@ -554,7 +512,6 @@ static void *grab_mapping_entry(struct xa_state *xas, xas_lock_irq(xas); } - dax_disassociate_entry(entry, mapping, false); xas_store(xas, NULL); /* undo the PMD join */ dax_wake_entry(xas, entry, WAKE_ALL); mapping->nrpages -= PG_PMD_NR; @@ -691,7 +648,6 @@ static int __dax_invalidate_entry(struct address_space *mapping, (xas_get_mark(&xas, PAGECACHE_TAG_DIRTY) || xas_get_mark(&xas, PAGECACHE_TAG_TOWRITE))) goto out; - dax_disassociate_entry(entry, mapping, trunc); xas_store(&xas, NULL); mapping->nrpages -= 1UL << dax_entry_order(entry); ret = 1; @@ -785,8 +741,6 @@ static void *dax_insert_entry(struct xa_state *xas, if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) { void *old; - dax_disassociate_entry(entry, mapping, false); - dax_associate_entry(new_entry, mapping, vmf->vma, vmf->address); /* * Only swap our new entry into the page cache if the current * entry is a zero page or an empty entry. If a normal PTE or