From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE6F6C433F5 for ; Sun, 10 Apr 2022 16:09:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243528AbiDJQLu (ORCPT ); Sun, 10 Apr 2022 12:11:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243480AbiDJQL1 (ORCPT ); Sun, 10 Apr 2022 12:11:27 -0400 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id EE9FC193D8; Sun, 10 Apr 2022 09:09:15 -0700 (PDT) IronPort-Data: =?us-ascii?q?A9a23=3Ac3YRx684NUUSZffSz9O+DrUD/3+TJUtcMsCJ2f8?= =?us-ascii?q?bfWQNrUoigTMHn2sXUGzUMqzcYTP0ettyaN638RkBsJPXyYRnTldlrnsFo1Bi8?= =?us-ascii?q?5ScXYvDRqvT04J+FuWaFQQ/qZx2huDodKjYdVeB4Ef9WlTdhSMkj/vQHOKlULe?= =?us-ascii?q?s1h1ZHmeIdg9w0HqPpMZp2uaEsfDha++8kYuaT//3YTdJ6BYoWo4g0J9vnTs01?= =?us-ascii?q?BjEVJz0iXRlDRxDlAe2e3D4l/vzL4npR5fzatE88uJX24/+IL+FEmPxp3/BC/u?= =?us-ascii?q?ulPD1b08LXqXPewOJjxK6WYD72l4b+HN0if19aZLwam8O49mNt8pswdNWpNq+T?= =?us-ascii?q?xw1FqPRmuUBSAQeGCZ7VUFD0OadeiTi6pzJkyUqdFOpmZ2CFnoeMYQG++pfD3t?= =?us-ascii?q?J8PsCIjERKBuEgoqewLm7YuhqiN4qIMTiMMUYoH4I5T3QC7AkB4/CR6HL7NpD9?= =?us-ascii?q?DY2ms1KW/3ZYqIxZThwaxLPSx5CIFEaDNQ5hujArn3+dSBI7VeQjakp6mPQigt?= =?us-ascii?q?r39DFNsTZe9mPbcFUhVqD4GbH+XnpRB0XKrS3yTGF2na3mqnDkEvTWosUGfuz9?= =?us-ascii?q?uNCh0eazWgeThYRUDOTpfi/l177VclTJlIZ/gIwoqUosk+mVN/wW1u/unHslho?= =?us-ascii?q?dXcdAVu438geAzoLK7AuDQGsJVDhMbJohrsBebTgr0EKZ2sPnHhRxv7CPD3GQ7?= =?us-ascii?q?LGZqXW1Iyd9EIOoTUfoViNcu5+6/t511UmJE75e/GeOpoWdMVnNL/qi8EDSX4k?= =?us-ascii?q?usPM=3D?= IronPort-HdrOrdr: =?us-ascii?q?A9a23=3Al50GkKCYqSimDlnlHemQ55DYdb4zR+YMi2TD?= =?us-ascii?q?tnoBLSC9F/b0qynAppomPGDP4gr5NEtApTniAtjkfZq/z+8X3WB5B97LMzUO01?= =?us-ascii?q?HYTr2Kg7GD/xTQXwX69sN4kZxrarVCDrTLZmRSvILX5xaZHr8brOW6zA=3D=3D?= X-IronPort-AV: E=Sophos;i="5.88,333,1635177600"; d="scan'208";a="123453824" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 11 Apr 2022 00:09:14 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 31C3C4D17165; Mon, 11 Apr 2022 00:09:09 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Mon, 11 Apr 2022 00:09:10 +0800 Received: from irides.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Mon, 11 Apr 2022 00:09:07 +0800 From: Shiyang Ruan To: , , , , CC: , , , , , Christoph Hellwig Subject: [PATCH v12 5/7] mm: Introduce mf_dax_kill_procs() for fsdax case Date: Mon, 11 Apr 2022 00:09:02 +0800 Message-ID: <20220410160904.3758789-6-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220410160904.3758789-1-ruansy.fnst@fujitsu.com> References: <20220410160904.3758789-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-yoursite-MailScanner-ID: 31C3C4D17165.AFA2A X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This new function is a variant of mf_generic_kill_procs that accepts a file, offset pair instead o a struct to support multiple files sharing a DAX mapping. It is intended to be called by the file systems as part of the memory_failure handler after the file system performed a reverse mapping from the storage address to the file and file offset. Signed-off-by: Shiyang Ruan Reviewed-by: Dan Williams Reviewed-by: Christoph Hellwig --- include/linux/mm.h | 2 + mm/memory-failure.c | 96 ++++++++++++++++++++++++++++++++++++++++----- 2 files changed, 88 insertions(+), 10 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index e0ad13486035..742604feef28 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3226,6 +3226,8 @@ enum mf_flags { MF_SOFT_OFFLINE = 1 << 3, MF_UNPOISON = 1 << 4, }; +int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, + unsigned long count, int mf_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 c8c898669c75..0664115c570b 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -295,10 +295,9 @@ void shake_page(struct page *p) } EXPORT_SYMBOL_GPL(shake_page); -static unsigned long dev_pagemap_mapping_shift(struct page *page, - struct vm_area_struct *vma) +static unsigned long dev_pagemap_mapping_shift(struct vm_area_struct *vma, + unsigned long address) { - unsigned long address = vma_address(page, vma); unsigned long ret = 0; pgd_t *pgd; p4d_t *p4d; @@ -338,10 +337,14 @@ 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. + * + * Notice: @fsdax_pgoff is used only when @p is a fsdax page. + * In other cases, such as anonymous and file-backend page, the address to be + * killed can be caculated by @p itself. */ static void add_to_kill(struct task_struct *tsk, struct page *p, - struct vm_area_struct *vma, - struct list_head *to_kill) + pgoff_t fsdax_pgoff, struct vm_area_struct *vma, + struct list_head *to_kill) { struct to_kill *tk; @@ -352,9 +355,15 @@ 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 not used for fsdax, we need + * calculate the address based on the vma. + */ + if (p->pgmap->type == MEMORY_DEVICE_FS_DAX) + tk->addr = vma_pgoff_address(fsdax_pgoff, 1, vma); + tk->size_shift = dev_pagemap_mapping_shift(vma, tk->addr); + } else tk->size_shift = page_shift(compound_head(p)); /* @@ -503,7 +512,7 @@ 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); @@ -539,13 +548,41 @@ 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, 0, vma, to_kill); } } read_unlock(&tasklist_lock); i_mmap_unlock_read(mapping); } +#if IS_ENABLED(CONFIG_FS_DAX) +/* + * Collect processes when the error hit a fsdax page. + */ +static void collect_procs_fsdax(struct page *page, + struct address_space *mapping, pgoff_t pgoff, + struct list_head *to_kill) +{ + struct vm_area_struct *vma; + struct task_struct *tsk; + + i_mmap_lock_read(mapping); + read_lock(&tasklist_lock); + for_each_process(tsk) { + struct task_struct *t = task_early_kill(tsk, true); + + if (!t) + continue; + vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) { + if (vma->vm_mm == t->mm) + add_to_kill(t, page, pgoff, vma, to_kill); + } + } + read_unlock(&tasklist_lock); + i_mmap_unlock_read(mapping); +} +#endif /* CONFIG_FS_DAX */ + /* * Collect the processes who have the corrupted page mapped to kill. */ @@ -1583,6 +1620,45 @@ static int mf_generic_kill_procs(unsigned long long pfn, int flags, return 0; } +#ifdef CONFIG_FS_DAX +/** + * mf_dax_kill_procs - Collect and kill processes who are using this file range + * @mapping: the file in use + * @index: start pgoff of the range within the file + * @count: length of the range, in unit of PAGE_SIZE + * @mf_flags: memory failure flags + */ +int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, + unsigned long count, int mf_flags) +{ + LIST_HEAD(to_kill); + dax_entry_t cookie; + struct page *page; + size_t end = index + count; + + mf_flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + + for (; index < end; index++) { + page = NULL; + cookie = dax_lock_mapping_entry(mapping, index, &page); + if (!cookie) + return -EBUSY; + if (!page) + goto unlock; + + SetPageHWPoison(page); + + collect_procs_fsdax(page, mapping, index, &to_kill); + unmap_and_kill(&to_kill, page_to_pfn(page), mapping, + index, mf_flags); +unlock: + dax_unlock_mapping_entry(mapping, index, cookie); + } + return 0; +} +EXPORT_SYMBOL_GPL(mf_dax_kill_procs); +#endif /* CONFIG_FS_DAX */ + /* * Called from hugetlb code with hugetlb_lock held. * If a hugepage is successfully grabbed (so it's determined to handle -- 2.35.1