Re: [PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end

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To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end
From: David Howells <dhowells@xxxxxxxxxx>
Date: Thu, 16 Dec 2021 21:17:47 +0000
Cc: dhowells@xxxxxxxxxx, Matthew Wilcox <willy@xxxxxxxxxxxxx>, linux-cachefs@xxxxxxxxxx, Jeff Layton <jlayton@xxxxxxxxxx>, Marc Dionne <marc.dionne@xxxxxxxxxxxx>, linux-afs@xxxxxxxxxxxxxxxxxxx, Trond Myklebust <trondmy@xxxxxxxxxxxxxxx>, Anna Schumaker <anna.schumaker@xxxxxxxxxx>, Steve French <sfrench@xxxxxxxxx>, Dominique Martinet <asmadeus@xxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Omar Sandoval <osandov@xxxxxxxxxxx>, JeffleXu <jefflexu@xxxxxxxxxxxxxxxxx>, "open list:NFS, SUNRPC, AND..." <linux-nfs@xxxxxxxxxxxxxxx>, CIFS <linux-cifs@xxxxxxxxxxxxxxx>, ceph-devel@xxxxxxxxxxxxxxx, v9fs-developer@xxxxxxxxxxxxxxxxxxxxx, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <CAHk-=wh2dr=NgVSVj0sw-gSuzhxhLRV5FymfPS146zGgF4kBjA@mail.gmail.com>
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Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> So I will NAK these patches by David, because they are fundamentally
> wrong, whichever way we turn. Any "write in bigger chunks" patch will
> be something else entirely.

I'll just drop patches 56 and 57 for now, then.  I think the problem only
manifests if I set the flag saying the filesystem/inode/whatever supports
multipage folios.

David

References:
- Re: [PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end
  - From: Linus Torvalds
- [PATCH v3 00/68] fscache, cachefiles: Rewrite
  - From: David Howells
- [PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end
  - From: David Howells
- Re: [PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end
  - From: Linus Torvalds
- Re: [PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end
  - From: Matthew Wilcox

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