From: Christoph Hellwig <hch@infradead.org>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: Christoph Hellwig <hch@infradead.org>,
linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
nvdimm@lists.linux.dev, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, djwong@kernel.org,
dan.j.williams@intel.com, david@fromorbit.com,
jane.chu@oracle.com
Subject: Re: [PATCH v9 10/10] fsdax: set a CoW flag when associate reflink mappings
Date: Thu, 20 Jan 2022 23:16:21 -0800 [thread overview]
Message-ID: <YepdxZ+XrAZYv1dX@infradead.org> (raw)
In-Reply-To: <70a24c20-d7ee-064c-e863-9f012422a2f5@fujitsu.com>
On Fri, Jan 21, 2022 at 10:33:58AM +0800, Shiyang Ruan wrote:
> >
> > But different question, how does this not conflict with:
> >
> > #define PAGE_MAPPING_ANON 0x1
> >
> > in page-flags.h?
>
> Now we are treating dax pages, so I think its flags should be different from
> normal page. In another word, PAGE_MAPPING_ANON is a flag of rmap mechanism
> for normal page, it doesn't work for dax page. And now, we have dax rmap
> for dax page. So, I think this two kinds of flags are supposed to be used
> in different mechanisms and won't conflect.
It just needs someone to use folio_test_anon in a place where a DAX
folio can be passed. This probably should not happen, but we need to
clearly document that.
> > Either way I think this flag should move to page-flags.h and be
> > integrated with the PAGE_MAPPING_FLAGS infrastucture.
>
> And that's why I keep them in this dax.c file.
But that does not integrate it with the infrastructure. For people
to debug things it needs to be next to PAGE_MAPPING_ANON and have
documentation explaining why they are exclusive.
next prev parent reply other threads:[~2022-01-21 7:16 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-26 14:34 [PATCH v9 00/10] fsdax: introduce fs query to support reflink Shiyang Ruan
2021-12-26 14:34 ` [PATCH v9 01/10] dax: Use percpu rwsem for dax_{read,write}_lock() Shiyang Ruan
2022-01-04 22:44 ` Dan Williams
2022-01-05 17:45 ` Darrick J. Wong
2022-01-06 11:06 ` Shiyang Ruan
2021-12-26 14:34 ` [PATCH v9 02/10] dax: Introduce holder for dax_device Shiyang Ruan
2022-01-05 18:12 ` Darrick J. Wong
2022-01-05 18:23 ` Dan Williams
2022-01-05 18:56 ` Darrick J. Wong
2022-01-05 19:20 ` Dan Williams
2022-01-05 22:47 ` Darrick J. Wong
2022-01-05 23:01 ` Dan Williams
2022-01-05 23:54 ` Darrick J. Wong
2022-01-06 0:12 ` Dan Williams
2022-01-20 8:46 ` Christoph Hellwig
2022-01-21 1:26 ` Shiyang Ruan
2022-01-21 2:22 ` Darrick J. Wong
2022-01-21 7:17 ` Christoph Hellwig
2022-02-15 21:51 ` Dan Williams
2021-12-26 14:34 ` [PATCH v9 03/10] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2021-12-26 14:34 ` [PATCH v9 04/10] pagemap,pmem: Introduce ->memory_failure() Shiyang Ruan
2022-01-05 19:06 ` Darrick J. Wong
2021-12-26 14:34 ` [PATCH v9 05/10] fsdax: fix function description Shiyang Ruan
2022-01-05 17:50 ` Darrick J. Wong
2022-01-20 8:47 ` Christoph Hellwig
2021-12-26 14:34 ` [PATCH v9 06/10] fsdax: Introduce dax_lock_mapping_entry() Shiyang Ruan
2022-01-04 22:55 ` Dan Williams
2021-12-26 14:34 ` [PATCH v9 07/10] mm: move pgoff_address() to vma_pgoff_address() Shiyang Ruan
2022-01-20 8:47 ` Christoph Hellwig
2021-12-26 14:34 ` [PATCH v9 08/10] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2022-01-20 8:55 ` Christoph Hellwig
2021-12-26 14:34 ` [PATCH v9 09/10] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2022-01-05 18:53 ` Darrick J. Wong
2022-01-05 21:17 ` Dan Williams
2021-12-26 14:34 ` [PATCH v9 10/10] fsdax: set a CoW flag when associate reflink mappings Shiyang Ruan
2022-01-20 8:59 ` Christoph Hellwig
2022-01-21 2:33 ` Shiyang Ruan
2022-01-21 7:16 ` Christoph Hellwig [this message]
2022-01-21 8:34 ` Shiyang Ruan
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