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From: Dan Williams <dan.j.williams@intel.com>
To: linux-nvdimm@lists.01.org
Cc: Jan Kara <jack@suse.cz>,
	hch@lst.de, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v6 03/13] device-dax: Set page->index
Date: Fri, 13 Jul 2018 21:49:45 -0700	[thread overview]
Message-ID: <153154378540.34503.13530001843688931438.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <153154376846.34503.15480221419473501643.stgit@dwillia2-desk3.amr.corp.intel.com>

In support of enabling memory_failure() handling for device-dax
mappings, set ->index to the pgoff of the page. The rmap implementation
requires ->index to bound the search through the vma interval tree.

The ->index value is never cleared. There is no possibility for the
page to become associated with another pgoff while the device is
enabled. When the device is disabled the 'struct page' array for the
device is destroyed and ->index is reinitialized to zero.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/dax/device.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 95cfcfd612df..361a11089591 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -416,6 +416,7 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
 
 	if (rc == VM_FAULT_NOPAGE) {
 		unsigned long i;
+		pgoff_t pgoff;
 
 		/*
 		 * In the device-dax case the only possibility for a
@@ -423,6 +424,8 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
 		 * mapped. No need to consider the zero page, or racing
 		 * conflicting mappings.
 		 */
+		pgoff = linear_page_index(vmf->vma, vmf->address
+				& ~(fault_size - 1));
 		for (i = 0; i < fault_size / PAGE_SIZE; i++) {
 			struct page *page;
 
@@ -430,6 +433,7 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
 			if (page->mapping)
 				continue;
 			page->mapping = filp->f_mapping;
+			page->index = pgoff + i;
 		}
 	}
 	dax_read_unlock(id);


  parent reply	other threads:[~2018-07-14  4:59 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-14  4:49 [PATCH v6 00/13] mm: Teach memory_failure() about ZONE_DEVICE pages Dan Williams
2018-07-14  4:49 ` [PATCH v6 01/13] device-dax: Convert to vmf_insert_mixed and vm_fault_t Dan Williams
2018-07-14  4:49 ` [PATCH v6 02/13] device-dax: Enable page_mapping() Dan Williams
2018-07-14  4:49 ` Dan Williams [this message]
2018-07-14  4:49 ` [PATCH v6 04/13] filesystem-dax: Set page->index Dan Williams
2018-07-14  4:49 ` [PATCH v6 05/13] mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE pages Dan Williams
2018-07-17  6:47   ` Naoya Horiguchi
2018-07-14  4:50 ` [PATCH v6 06/13] mm, dev_pagemap: Do not clear ->mapping on final put Dan Williams
2018-07-23 16:12   ` Dave Jiang
2018-07-23 16:23     ` Jerome Glisse
2018-07-14  4:50 ` [PATCH v6 07/13] mm, madvise_inject_error: Let memory_failure() optionally take a page reference Dan Williams
2018-07-17  6:52   ` Naoya Horiguchi
2018-07-14  4:50 ` [PATCH v6 08/13] mm, memory_failure: Collect mapping size in collect_procs() Dan Williams
2018-07-14  4:50 ` [PATCH v6 09/13] filesystem-dax: Introduce dax_lock_mapping_entry() Dan Williams
2018-08-06  9:21   ` Jan Kara
2018-07-14  4:50 ` [PATCH v6 10/13] mm, memory_failure: Teach memory_failure() about dev_pagemap pages Dan Williams
2018-08-06  9:27   ` Jan Kara
2018-07-14  4:50 ` [PATCH v6 11/13] x86/mm/pat: Prepare {reserve, free}_memtype() for "decoy" addresses Dan Williams
2018-07-24  7:36   ` Ingo Molnar
2018-07-24 15:46     ` Dave Jiang
2018-07-14  4:50 ` [PATCH v6 12/13] x86/memory_failure: Introduce {set, clear}_mce_nospec() Dan Williams
2018-07-14  4:50 ` [PATCH v6 13/13] libnvdimm, pmem: Restore page attributes when clearing errors Dan Williams
2018-07-19 17:57 ` [PATCH v6 00/13] mm: Teach memory_failure() about ZONE_DEVICE pages Dave Jiang
2018-07-24  7:39   ` Ingo Molnar

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