On Wed, Jan 09, 2019 at 09:00:57PM +0530, Kanchan Joshi wrote:

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.            

The nvme driver disables streams if the controller doesn't support
BLK_MAX_WRITE_HINT number of streams, so this series breaks the feature
for controllers that only support up to 4.