From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: [PATCH v5 03/11] device-dax: Set page->index From: Dan Williams To: linux-nvdimm@lists.01.org Cc: Jan Kara , hch@lst.de, hch@lst.de, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, jack@suse.cz, ross.zwisler@linux.intel.com Date: Wed, 04 Jul 2018 14:40:39 -0700 Message-ID: <153074043918.27838.10612469015732111514.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <153074042316.27838.17319837331947007626.stgit@dwillia2-desk3.amr.corp.intel.com> References: <153074042316.27838.17319837331947007626.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: 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 Signed-off-by: Dan Williams --- 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);