[v5,5/9] mm: Introduce mf_dax_kill_procs() for fsdax case

Message ID	20210628000218.387833-6-ruansy.fnst@fujitsu.com (mailing list archive)
State	New
Headers	show Return-Path: <SRS0=nkpv=LW=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5C1FF619F1 IronPort-HdrOrdr: A9a23:sFZRU6yVrBjE/57Jb06LKrPwEL1zdoMgy1knxilNoH1uA6ilfqWV8cjzuiWbtN9vYhsdcLy7WZVoIkmskKKdg7NhXotKNTOO0ASVxepZnOnfKlPbexHWx6p00KdMV+xEAsTsMF4St63HyTj9P9E+4NTvysyVuds= From: Shiyang Ruan <ruansy.fnst@fujitsu.com> To: <linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>, <nvdimm@lists.linux.dev>, <linux-mm@kvack.org>, <linux-fsdevel@vger.kernel.org>, <dm-devel@redhat.com> CC: <darrick.wong@oracle.com>, <dan.j.williams@intel.com>, <david@fromorbit.com>, <hch@lst.de>, <agk@redhat.com>, <snitzer@redhat.com>, <rgoldwyn@suse.de> 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> In-Reply-To: <20210628000218.387833-1-ruansy.fnst@fujitsu.com> References: <20210628000218.387833-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	fsdax: introduce fs query to support reflink \| expand [v5,0/9] fsdax: introduce fs query to support reflink [v5,1/9] pagemap: Introduce ->memory_failure() [v5,2/9] dax: Introduce holder for dax_device [v5,3/9] mm: factor helpers for memory_failure_dev_pagemap [v5,4/9] pmem,mm: Implement ->memory_failure in pmem driver [v5,5/9] mm: Introduce mf_dax_kill_procs() for fsdax case [v5,6/9] xfs: Implement ->corrupted_range() for XFS [v5,7/9] dm: Introduce ->rmap() to find bdev offset [v5,8/9] md: Implement dax_holder_operations [v5,9/9] fs/dax: Remove useless functions

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);

[v5,5/9] mm: Introduce mf_dax_kill_procs() for fsdax case

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