linux-ext4 - Re: [PATCH v2 0/4] Write-hint for FS journal

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Message-ID: <20190125162353.GA11210@localhost.localdomain>
Date:   Fri, 25 Jan 2019 09:23:53 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     Kanchan Joshi <joshi.k@...sung.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-nvme@...ts.infradead.org,
        jack@...e.com, david@...morbit.com, tytso@....edu,
        prakash.v@...sung.com
Subject: Re: [PATCH v2 0/4] Write-hint for FS journal

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.