linux-kernel - [PATCH 0/2] Write protect DAX PMDs in *sync path

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Date:   Tue, 20 Dec 2016 15:23:04 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...el.com>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org
Subject: [PATCH 0/2] Write protect DAX PMDs in *sync path

Currently dax_mapping_entry_mkclean() fails to clean and write protect the
pmd_t of a DAX PMD entry during an *sync operation.  This can result in
data loss, as detailed in patch 2.

This series is based on Dan's "libnvdimm-pending" branch, which is the
current home for Jan's "dax: Page invalidation fixes" series.  You can find
a working tree here:

https://git.kernel.org/cgit/linux/kernel/git/zwisler/linux.git/log/?h=dax_pmd_clean

Ross Zwisler (2):
  mm: add follow_pte_pmd()
  dax: wrprotect pmd_t in dax_mapping_entry_mkclean

 fs/dax.c           | 51 ++++++++++++++++++++++++++++++++++++---------------
 include/linux/mm.h |  4 ++--
 mm/memory.c        | 41 ++++++++++++++++++++++++++++++++---------
 3 files changed, 70 insertions(+), 26 deletions(-)

-- 
2.7.4