Re: [RFC PATCH 1/5] fs: add a new user_write_streams() callback

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To: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
Subject: Re: [RFC PATCH 1/5] fs: add a new user_write_streams() callback
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 12 Aug 2025 10:21:32 +0200
Cc: kbusch@xxxxxxxxxx, hch@xxxxxx, axboe@xxxxxxxxx, brauner@xxxxxxxxxx, josef@xxxxxxxxxxxxxx, jack@xxxxxxx, jlayton@xxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, gost.dev@xxxxxxxxxxx
In-reply-to: <20250729145135.12463-2-joshi.k@samsung.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Tue, Jul 29, 2025 at 08:21:31PM +0530, Kanchan Joshi wrote:
> so that filesystem can control number of write streams for user space.

This feels the wrong way around.  I'd rather implement the actual interface
to get/set the write streams in the file system (maybe using common
helpers) than encode the nunber in a file operation.

References:
- [RFC PATCH 0/5] FDP file I/O
  - From: Kanchan Joshi
- [RFC PATCH 1/5] fs: add a new user_write_streams() callback
  - From: Kanchan Joshi

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