[PATCH v2 0/4] Write-hint for FS journal

[Kanchan Joshi <joshi.k@samsung.com>]

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)


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