[PATCH v7 0/9] DAX fsync/msync support

[Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>]

Changes since v6 [1]:

1) Fixed an existing NULL pointer dereference bug in __dax_dbg() in patch 1.

2) Fixed an existing bug with the way holes are converted into DAX PMD
entries in patch 2.  This solves a BUG_ON reported by Dan Williams.

3) Removed second verification of our radix tree entry before cache flush
in dax_writeback_one(). (Jan Kara)

4) Updated to the new argument list types for dax_pmd_dbg(). (Dan Williams)

5) Fixed the text of a random debug message so that it accurately reflects
the error being found.

This series replaces v6 in the MM tree and in the "akpm" branch of the next
tree.  A working tree can be found here:

https://git.kernel.org/cgit/linux/kernel/git/zwisler/linux.git/log/?h=fsync_v7

[1]: https://lists.01.org/pipermail/linux-nvdimm/2015-December/003663.html

Ross Zwisler (9):
  dax: fix NULL pointer dereference in __dax_dbg()
  dax: fix conversion of holes to PMDs
  pmem: add wb_cache_pmem() to the PMEM API
  dax: support dirty DAX entries in radix tree
  mm: add find_get_entries_tag()
  dax: add support for fsync/msync
  ext2: call dax_pfn_mkwrite() for DAX fsync/msync
  ext4: call dax_pfn_mkwrite() for DAX fsync/msync
  xfs: call dax_pfn_mkwrite() for DAX fsync/msync

 arch/x86/include/asm/pmem.h |  11 +--
 fs/block_dev.c              |   2 +-
 fs/dax.c                    | 214 ++++++++++++++++++++++++++++++++++++++++----
 fs/ext2/file.c              |   4 +-
 fs/ext4/file.c              |   4 +-
 fs/inode.c                  |   2 +-
 fs/xfs/xfs_file.c           |   7 +-
 include/linux/dax.h         |   7 ++
 include/linux/fs.h          |   3 +-
 include/linux/pagemap.h     |   3 +
 include/linux/pmem.h        |  22 ++++-
 include/linux/radix-tree.h  |   9 ++
 mm/filemap.c                |  91 +++++++++++++++++--
 mm/truncate.c               |  69 +++++++-------
 mm/vmscan.c                 |   9 +-
 mm/workingset.c             |   4 +-
 16 files changed, 391 insertions(+), 70 deletions(-)

-- 
2.5.0