From: Dan Williams <dan.j.williams@intel.com>
To: linux-nvdimm@lists.01.org
Cc: Jan Kara <jack@suse.cz>,
linux-kernel@vger.kernel.org,
Matthew Wilcox <willy@infradead.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH v6 04/13] filesystem-dax: Set page->index
Date: Fri, 13 Jul 2018 21:49:50 -0700 [thread overview]
Message-ID: <153154379074.34503.9610948190338126460.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 filesystem-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 is set and cleared at dax_associate_entry() and
dax_disassociate_entry() time respectively.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
fs/dax.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 641192808bb6..4de11ed463ce 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -319,18 +319,27 @@ static unsigned long dax_radix_end_pfn(void *entry)
for (pfn = dax_radix_pfn(entry); \
pfn < dax_radix_end_pfn(entry); pfn++)
-static void dax_associate_entry(void *entry, struct address_space *mapping)
+/*
+ * 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 pfn;
+ 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++;
}
}
@@ -348,6 +357,7 @@ static void dax_disassociate_entry(void *entry, struct address_space *mapping,
WARN_ON_ONCE(trunc && page_ref_count(page) > 1);
WARN_ON_ONCE(page->mapping && page->mapping != mapping);
page->mapping = NULL;
+ page->index = 0;
}
}
@@ -701,7 +711,7 @@ static void *dax_insert_mapping_entry(struct address_space *mapping,
new_entry = dax_radix_locked_entry(pfn, flags);
if (dax_entry_size(entry) != dax_entry_size(new_entry)) {
dax_disassociate_entry(entry, mapping, false);
- dax_associate_entry(new_entry, mapping);
+ dax_associate_entry(new_entry, mapping, vmf->vma, vmf->address);
}
if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) {
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next prev 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 ` [PATCH v6 03/13] device-dax: Set page->index Dan Williams
2018-07-14 4:49 ` Dan Williams [this message]
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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