Hi Jens,
Can you please have a glance on this patch series, given than attempt is 
to extend the original architecture of write-hints.

Thanks,

On Thursday 24 January 2019 01:59 PM, Jan Kara wrote:

Hello,

On Wed 09-01-19 21:00:57, Kanchan Joshi wrote:

quoted

Towards supporing write-hints/streams for filesystem journal.
                                                                                 
Here is the v1 patch for background -
https://marc.info/?l=linux-fsdevel&m=154444637519020&w=2
                                                                                 
Changes since v1:
- introduce four more hints for in-kernel use, as recommended by Dave chinner
   & Jens axboe. This isolates kernel-mode hints from user-mode ones.
- remove mount-option to specify write-hint, as recommended by Jan kara &
   Dave chinner. Rather, FS always sets write-hint for journal. This gets ignored
   if device does not support stream.
- Removed code-redundancy for write_dirty_buffer (Jan kara's review comment)

I guess the series should also go to Jens since he was the original author
of write-hint support so he has the best idea about the architecture.

								Honza

quoted

Kanchan Joshi (4):
   block: Increase count of supported write-hints
   fs: introduce four macros for in-kernel hints
   fs: introduce APIs to enable sending write-hint with buffer-head
   fs/ext4,jbd2: add support for passing write-hint with journal.

  fs/buffer.c                 | 18 ++++++++++++++++--
  fs/ext4/super.c             |  2 ++
  fs/jbd2/commit.c            | 11 +++++++----
  fs/jbd2/journal.c           |  3 ++-
  fs/jbd2/revoke.c            |  3 ++-
  include/linux/blkdev.h      |  5 ++++-
  include/linux/buffer_head.h |  3 +++
  include/linux/fs.h          |  5 +++++
  include/linux/jbd2.h        |  8 ++++++++
  9 files changed, 49 insertions(+), 9 deletions(-)

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2.7.4