Re: [RFC PATCH 2/8] mm: Add PG_atomic

[RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 2/8] mm: Add PG_atomic · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
Re: [RFC PATCH 2/8] mm: Add PG_atomic · Matthew Wilcox <willy@infradead.org> · 2025-11-12
Re: [RFC PATCH 2/8] mm: Add PG_atomic · "David Hildenbrand (Red Hat)" <david@kernel.org> · 2025-11-13
Re: [RFC PATCH 2/8] mm: Add PG_atomic · Ritesh Harjani (IBM) <ritesh.list@gmail.com> · 2025-11-14
Re: [RFC PATCH 2/8] mm: Add PG_atomic · Matthew Wilcox <willy@infradead.org> · 2025-11-14
Re: [RFC PATCH 2/8] mm: Add PG_atomic · Ritesh Harjani (IBM) <ritesh.list@gmail.com> · 2025-11-18
Re: [RFC PATCH 2/8] mm: Add PG_atomic · Dave Chinner <david@fromorbit.com> · 2025-11-18
[RFC PATCH 1/8] fs: Rename STATX{_ATTR}_WRITE_ATOMIC -> STATX{_ATTR}_WRITE_ATOMIC_DIO · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 3/8] fs: Add initial buffered atomic write support info to statx · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 4/8] iomap: buffered atomic write support · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 5/8] iomap: pin pages for RWF_ATOMIC buffered write · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 6/8] xfs: Report atomic write min and max for buf io as well · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 8/8] xfs: Lift the bs == ps restriction for HW buffered atomic writes · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[RFC PATCH 7/8] iomap: Add bs<ps buffered atomic writes support · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-12
[syzbot ci] Re: xfs: single block atomic writes for buffered IO · syzbot ci <hidden> · 2025-11-12
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Dave Chinner <david@fromorbit.com> · 2025-11-12
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Christoph Hellwig <hch@lst.de> · 2025-11-13
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Ritesh Harjani (IBM) <ritesh.list@gmail.com> · 2025-11-13
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Christoph Hellwig <hch@lst.de> · 2025-11-13
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Dave Chinner <david@fromorbit.com> · 2025-11-13
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-14
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Matthew Wilcox <willy@infradead.org> · 2025-11-14
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Dave Chinner <david@fromorbit.com> · 2025-11-16
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · John Garry <john.g.garry@oracle.com> · 2025-11-17
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Dave Chinner <david@fromorbit.com> · 2025-11-17
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-20
Re: [RFC PATCH 0/8] xfs: single block atomic writes for buffered IO · Ojaswin Mujoo <ojaswin@linux.ibm.com> · 2025-11-20

From: "David Hildenbrand (Red Hat)" <david@kernel.org>
Date: 2025-11-13 12:34:29
Also in: linux-block, linux-ext4, linux-fsdevel, linux-mm, linux-xfs, lkml

On 12.11.25 16:56, Matthew Wilcox wrote:

On Wed, Nov 12, 2025 at 04:36:05PM +0530, Ojaswin Mujoo wrote:

quoted

From: John Garry <john.g.garry@oracle.com>

Add page flag PG_atomic, meaning that a folio needs to be written back
atomically. This will be used by for handling RWF_ATOMIC buffered IO
in upcoming patches.

Page flags are a precious resource.  I'm not thrilled about allocating one
to this rather niche usecase.

Fully agreed.

-- 
Cheers

David

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