[PATCH v6 0/6] dax/pmem: Provide a dax operation to zero page range

[Vivek Goyal <vgoyal@redhat.com>]

Hi,

This is V6 of patches. These patches are also available at.

Changes since V5:

- Dan Williams preferred ->zero_page_range() to only accept PAGE_SIZE
  aligned request and clear poison only on page size aligned zeroing. So
  I changed it accordingly. 

- Dropped all the modifications which were required to support arbitrary
  range zeroing with-in a page.

- This patch series also fixes the issue where "truncate -s 512 foo.txt"
  will fail if first sector of file is poisoned. Currently it succeeds
  and filesystem expectes whole of the filesystem block to be free of
  poison at the end of the operation.

Christoph, I have dropped your Reviewed-by tag on 1-2 patches because
these patches changed substantially. Especially signature of of
dax zero_page_range() helper.

Thanks
Vivek

Vivek Goyal (6):
  pmem: Add functions for reading/writing page to/from pmem
  dax, pmem: Add a dax operation zero_page_range
  s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver
  dm,dax: Add dax zero_page_range operation
  dax: Use new dax zero page method for zeroing a page
  dax,iomap: Add helper dax_iomap_zero() to zero a range

 drivers/dax/super.c           | 20 ++++++++
 drivers/md/dm-linear.c        | 18 +++++++
 drivers/md/dm-log-writes.c    | 17 ++++++
 drivers/md/dm-stripe.c        | 23 +++++++++
 drivers/md/dm.c               | 30 +++++++++++
 drivers/nvdimm/pmem.c         | 97 ++++++++++++++++++++++-------------
 drivers/s390/block/dcssblk.c  | 15 ++++++
 fs/dax.c                      | 59 ++++++++++-----------
 fs/iomap/buffered-io.c        |  9 +---
 include/linux/dax.h           | 21 +++-----
 include/linux/device-mapper.h |  3 ++
 11 files changed, 221 insertions(+), 91 deletions(-)

-- 
2.20.1