linux-kernel - [PATCH v2 0/4] Write protect DAX PMDs in *sync path

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Date:   Thu, 22 Dec 2016 14:18:52 -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>,
        Arnd Bergmann <arnd@...db.de>, 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-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-nvdimm@...ts.01.org
Subject: [PATCH v2 0/4] 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 4.

You can find a working tree here:

https://git.kernel.org/cgit/linux/kernel/git/zwisler/linux.git/log/?h=dax_pmd_clean_v2

This series applies cleanly to mmotm-2016-12-19-16-31.

Changes since v1:
 - Included Dan's patch to kill DAX support for UML.
 - Instead of wrapping the DAX PMD code in dax_mapping_entry_mkclean() in
   an #ifdef, we now create a stub for pmdp_huge_clear_flush() for the case
   when CONFIG_TRANSPARENT_HUGEPAGE isn't defined. (Dan & Jan)

Dan Williams (1):
  dax: kill uml support

Ross Zwisler (3):
  dax: add stub for pmdp_huge_clear_flush()
  mm: add follow_pte_pmd()
  dax: wrprotect pmd_t in dax_mapping_entry_mkclean

 fs/Kconfig                    |  2 +-
 fs/dax.c                      | 49 ++++++++++++++++++++++++++++++-------------
 include/asm-generic/pgtable.h | 10 +++++++++
 include/linux/mm.h            |  4 ++--
 mm/memory.c                   | 41 ++++++++++++++++++++++++++++--------
 5 files changed, 79 insertions(+), 27 deletions(-)

-- 
2.7.4