From: "Darrick J. Wong" <djwong@kernel.org>
To: John Garry <john.g.garry@oracle.com>
Cc: brauner@kernel.org, hch@lst.de, viro@zeniv.linux.org.uk,
jack@suse.cz, cem@kernel.org, linux-fsdevel@vger.kernel.org,
dchinner@redhat.com, linux-xfs@vger.kernel.org,
linux-kernel@vger.kernel.org, ojaswin@linux.ibm.com,
ritesh.list@gmail.com, martin.petersen@oracle.com,
linux-ext4@vger.kernel.org, linux-block@vger.kernel.org,
catherine.hoang@oracle.com, linux-api@vger.kernel.org
Subject: Re: [PATCH v9 13/15] xfs: add xfs_compute_atomic_write_unit_max()
Date: Thu, 1 May 2025 09:23:08 -0700 [thread overview]
Message-ID: <20250501162308.GC25675@frogsfrogsfrogs> (raw)
In-Reply-To: <01f9a1df-859b-4117-8e12-cb06edee9f17@oracle.com>
On Thu, May 01, 2025 at 06:00:12AM +0100, John Garry wrote:
> On 01/05/2025 05:30, Darrick J. Wong wrote:
> > On Wed, Apr 30, 2025 at 08:52:00AM +0100, John Garry wrote:
> > > On 25/04/2025 17:45, John Garry wrote:
> > > > +static inline xfs_extlen_t xfs_calc_perag_awu_max(struct xfs_mount *mp)
> > > > +{
> > > > + if (mp->m_ddev_targp->bt_bdev_awu_min > 0)
> > > > + return max_pow_of_two_factor(mp->m_sb.sb_agblocks);
> > > > + return mp->m_ag_max_usable;
> > > I think that this should be rounddown_pow_of_two(mp->m_ag_max_usable)
> > >
> > > ditto for rt
> > >
> > > I will fix (unless disagree).
> > I don't think this needs fixing. If there's no hardware support on the
> > device, then we can do any size of atomic write that we want.
>
> Check man pages for statx:
>
> stx_atomic_write_unit_min
> stx_atomic_write_unit_max
> ... These values are each guaranteed to be
> a power-of-2.
>
> Same is enforced for size for RWF_ATOMIC.
Ok then.
--D
next prev parent reply other threads:[~2025-05-01 16:23 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-25 16:44 [PATCH v9 00/15] large atomic writes for xfs John Garry
2025-04-25 16:44 ` [PATCH v9 01/15] fs: add atomic write unit max opt to statx John Garry
2025-04-25 16:44 ` [PATCH v9 02/15] xfs: add helpers to compute log item overhead John Garry
2025-04-25 16:44 ` [PATCH v9 03/15] xfs: add helpers to compute transaction reservation for finishing intent items John Garry
2025-04-25 16:44 ` [PATCH v9 04/15] xfs: rename xfs_inode_can_atomicwrite() -> xfs_inode_can_hw_atomic_write() John Garry
2025-04-25 16:44 ` [PATCH v9 05/15] xfs: ignore HW which cannot atomic write a single block John Garry
2025-04-29 12:21 ` Christoph Hellwig
2025-04-29 14:44 ` Darrick J. Wong
2025-04-30 12:59 ` Christoph Hellwig
2025-05-01 16:22 ` Darrick J. Wong
2025-05-01 19:53 ` Darrick J. Wong
2025-04-30 5:18 ` [PATCH v9.1 " Darrick J. Wong
2025-04-25 16:44 ` [PATCH v9 06/15] xfs: allow block allocator to take an alignment hint John Garry
2025-04-25 16:44 ` [PATCH v9 07/15] xfs: refactor xfs_reflink_end_cow_extent() John Garry
2025-04-25 16:44 ` [PATCH v9 08/15] xfs: refine atomic write size check in xfs_file_write_iter() John Garry
2025-04-25 16:44 ` [PATCH v9 09/15] xfs: add xfs_atomic_write_cow_iomap_begin() John Garry
2025-04-25 16:44 ` [PATCH v9 10/15] xfs: add large atomic writes checks in xfs_direct_write_iomap_begin() John Garry
2025-04-25 16:45 ` [PATCH v9 11/15] xfs: commit CoW-based atomic writes atomically John Garry
2025-04-25 16:45 ` [PATCH v9 12/15] xfs: add xfs_file_dio_write_atomic() John Garry
2025-04-25 16:45 ` [PATCH v9 13/15] xfs: add xfs_compute_atomic_write_unit_max() John Garry
2025-04-30 7:52 ` John Garry
2025-05-01 4:30 ` Darrick J. Wong
2025-05-01 5:00 ` John Garry
2025-05-01 16:23 ` Darrick J. Wong [this message]
2025-04-25 16:45 ` [PATCH v9 14/15] xfs: update atomic write limits John Garry
2025-04-25 16:45 ` [PATCH v9 15/15] xfs: allow sysadmins to specify a maximum atomic write limit at mount time John Garry
2025-04-29 12:22 ` Christoph Hellwig
2025-04-29 14:38 ` Darrick J. Wong
2025-04-30 14:14 ` [PATCH v9 00/15] large atomic writes for xfs John Garry
2025-05-01 4:31 ` Darrick J. Wong
2025-05-01 5:04 ` John Garry
2025-05-01 13:44 ` Christoph Hellwig
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