From: Matthew Wilcox <willy@infradead.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jane Chu <jane.chu@oracle.com>,
linux-mm@kvack.org, Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
Jan Kara <jack@suse.cz>,
linux-fsdevel@vger.kernel.org,
Christian Brauner <christian@brauner.io>,
Jiaqi Yan <jiaqiyan@google.com>
Subject: Re: [PATCH v9 14/15] filemap: Add support for authoritative mappings
Date: Mon, 21 Sep 2026 22:19:42 +0100 [thread overview]
Message-ID: <arGfbk5Yv9UTlNqB@casper.infradead.org> (raw)
In-Reply-To: <0e0a0908-8e5d-4cee-9fbb-ce730bb662e1@kernel.org>
On Fri, Sep 18, 2026 at 03:51:59PM +0200, David Hildenbrand (Arm) wrote:
> On 8/5/26 23:05, Matthew Wilcox (Oracle) wrote:
> > +++ b/include/linux/pagemap.h
> > @@ -210,6 +210,7 @@ enum mapping_flags {
> > AS_WRITEBACK_MAY_DEADLOCK_ON_RECLAIM = 9,
> > AS_KERNEL_FILE = 10, /* mapping for a fake kernel file that shouldn't
> > account usage to user cgroups */
> > + AS_AUTHORITATIVE = 11, /* If we miss in the page cache, it's a hole */
>
> Just curious if "in-memory file system" would be a different way of looking at
> it. There, a hole in the page cache always expresses a hole in the file.
>
> AS_IN_MEMORY_FILE
>
> Just an idea, because that's why I always had in mind regarding that (all state
> in memory).
I suspect that's always going to be the case, but I don't want to be
quite so prescriptive. I'd rather describe the property than the user.
next prev parent reply other threads:[~2026-09-21 21:19 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-05 21:05 [PATCH v9 00/15] Use generic_file_read_iter() in hugetlbfs Matthew Wilcox (Oracle)
2026-08-05 21:05 ` [PATCH v9 01/15] memory-failure: Fix hardware poison check in unpoison_memory() again Matthew Wilcox (Oracle)
2026-08-05 21:05 ` [PATCH v9 02/15] memory-failure: Prevent hugetlb freeing during unpoisoning Matthew Wilcox (Oracle)
2026-09-04 3:38 ` Miaohe Lin
2026-08-05 21:05 ` [PATCH v9 03/15] mm: Rename folio_contain_hwpoison_page() to folio_has_hwpoison_page() Matthew Wilcox (Oracle)
2026-08-13 7:20 ` David Hildenbrand (Arm)
2026-08-05 21:05 ` [PATCH v9 04/15] hugetlb: Mark some function arguments as const Matthew Wilcox (Oracle)
2026-08-05 21:05 ` [PATCH v9 05/15] guest_memfd: Use folio_has_hwpoisoned_page() Matthew Wilcox (Oracle)
2026-08-13 7:20 ` David Hildenbrand (Arm)
2026-08-13 11:50 ` Matthew Wilcox
2026-08-25 18:41 ` David Hildenbrand (Arm)
2026-08-05 21:05 ` [PATCH v9 06/15] kpageflags: Use is_page_hwpoison() to set KPF_HWPOISON Matthew Wilcox (Oracle)
2026-08-13 7:25 ` David Hildenbrand (Arm)
2026-08-13 9:01 ` David Hildenbrand (Arm)
2026-09-23 18:59 ` Matthew Wilcox
2026-08-05 21:05 ` [PATCH v9 07/15] hugetlb: Move poison to pages before clearing hugetlb page type Matthew Wilcox (Oracle)
2026-08-05 21:05 ` [PATCH v9 08/15] hugetlb: Use the has_hwpoisoned flag Matthew Wilcox (Oracle)
2026-08-13 8:29 ` David Hildenbrand (Arm)
2026-08-13 16:17 ` Matthew Wilcox
2026-09-18 13:44 ` David Hildenbrand (Arm)
2026-09-21 21:32 ` Matthew Wilcox
2026-09-23 11:40 ` David Hildenbrand (Arm)
2026-09-23 19:10 ` Matthew Wilcox
2026-09-24 10:32 ` David Hildenbrand (Arm)
2026-09-24 18:53 ` Matthew Wilcox
2026-09-24 19:21 ` David Hildenbrand (Arm)
2026-09-24 21:28 ` Andrew Morton
2026-08-13 11:12 ` Pedro Falcato
2026-09-04 3:46 ` Miaohe Lin
2026-09-23 19:33 ` Matthew Wilcox
2026-08-05 21:05 ` [PATCH v9 09/15] mm: Remove locking mf_mutex in is_raw_hwpoison_page_in_hugepage() Matthew Wilcox (Oracle)
2026-09-04 6:35 ` Miaohe Lin
2026-09-23 19:34 ` Matthew Wilcox
2026-08-05 21:05 ` [PATCH v9 10/15] mm: Check individual hugetlb pages for poison Matthew Wilcox (Oracle)
2026-09-04 6:37 ` Miaohe Lin
2026-08-05 21:05 ` [PATCH v9 11/15] filemap: Add hwpoison handling to filemap_read() Matthew Wilcox (Oracle)
2026-08-13 10:55 ` Pedro Falcato
2026-08-13 16:33 ` Matthew Wilcox
2026-09-18 13:47 ` David Hildenbrand (Arm)
2026-09-21 20:08 ` Matthew Wilcox
2026-08-05 21:05 ` [PATCH v9 12/15] filemap: Remove checks in mapping_set_folio_order_range() Matthew Wilcox (Oracle)
2026-08-13 11:05 ` Pedro Falcato
2026-08-05 21:05 ` [PATCH v9 13/15] hugetlb: Set mapping folio order Matthew Wilcox (Oracle)
2026-08-13 11:06 ` Pedro Falcato
2026-09-18 13:47 ` David Hildenbrand (Arm)
2026-08-05 21:05 ` [PATCH v9 14/15] filemap: Add support for authoritative mappings Matthew Wilcox (Oracle)
2026-08-13 11:10 ` Pedro Falcato
2026-09-18 13:51 ` David Hildenbrand (Arm)
2026-09-21 21:19 ` Matthew Wilcox [this message]
2026-09-23 13:55 ` David Hildenbrand (Arm)
2026-08-05 21:05 ` [PATCH v9 15/15] hugetlb: replace hugetlbfs_read_iter() with generic_file_read_iter() Matthew Wilcox (Oracle)
2026-08-13 11:10 ` Pedro Falcato
2026-08-06 19:47 ` [PATCH v9 00/15] Use generic_file_read_iter() in hugetlbfs jane.chu
2026-08-13 8:37 ` Lorenzo Stoakes (ARM)
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