Re: [PATCH v3 9/9] mm: Remove swap BIO paths and only use DIO paths

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To: David Howells <dhowells@xxxxxxxxxx>
Subject: Re: [PATCH v3 9/9] mm: Remove swap BIO paths and only use DIO paths
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Sat, 25 Sep 2021 15:56:45 +0100
Cc: hch@xxxxxx, trond.myklebust@xxxxxxxxxxxxxxx, Jens Axboe <axboe@xxxxxxxxx>, "Darrick J. Wong" <djwong@xxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, darrick.wong@xxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, jlayton@xxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <163250396319.2330363.10564506508011638258.stgit@warthog.procyon.org.uk>
References: <163250387273.2330363.13240781819520072222.stgit@warthog.procyon.org.uk> <163250396319.2330363.10564506508011638258.stgit@warthog.procyon.org.uk>

On Fri, Sep 24, 2021 at 06:19:23PM +0100, David Howells wrote:
> Delete the BIO-generating swap read/write paths and always use ->swap_rw().
> This puts the mapping layer in the filesystem.

Is SWP_FS_OPS now unused after this patch?

Also, do we still need ->swap_activate and ->swap_deactivate?

References:
- [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles
  - From: David Howells
- [PATCH v3 9/9] mm: Remove swap BIO paths and only use DIO paths
  - From: David Howells

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