From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dai Ngo <dai.ngo@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
Dave Chinner <dgc@kernel.org>,
cem@kernel.org, linux-xfs@vger.kernel.org,
linux-nfs@vger.kernel.org,
Sergey Bashirov <sergeybashirov@gmail.com>
Subject: Re: [PATCH 1/1] xfs: fix overlapping extents returned for pNFS LAYOUTGET
Date: Wed, 20 May 2026 01:24:32 -0700 [thread overview]
Message-ID: <ag1vwFHoYatausLK@infradead.org> (raw)
In-Reply-To: <20260519145949.GH9555@frogsfrogsfrogs>
[adding Sergey, who wrote the code to allow multiple mappings]
On Tue, May 19, 2026 at 07:59:49AM -0700, Darrick J. Wong wrote:
> 1) xfs_fs_map_blocks only takes i_rwsem and XFS_ILOCK; it doesn't take
> the mmap invalidation lock. Does that mean that pagefaults could wander
> in and mess with the layout?
Looks like it.
> 2) Now that NFS apparently can serve up multiple mappings at once,
> should ->map_blocks pass in an array element count so that we can do
> multiple iomaps in a single lock cycle?
I guess we need to do that, or revert the code to provide multiple maps
for now.
> 3) Do the reflink and realtime inode checks need to be re-assessed after
> grabbing the ilock since they can change?
Yes.
next prev parent reply other threads:[~2026-05-20 8:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-12 17:21 [PATCH 1/1] xfs: fix overlapping extents returned for pNFS LAYOUTGET Dai Ngo
2026-05-12 17:34 ` Darrick J. Wong
2026-05-12 19:21 ` Dai Ngo
2026-05-13 7:01 ` Christoph Hellwig
2026-05-13 15:50 ` Dai Ngo
2026-05-13 17:28 ` Dai Ngo
2026-05-14 0:25 ` Darrick J. Wong
2026-05-14 17:19 ` Dai Ngo
2026-05-14 17:49 ` Darrick J. Wong
2026-05-15 21:39 ` Dave Chinner
2026-05-16 2:14 ` Dai Ngo
2026-05-18 5:09 ` Christoph Hellwig
2026-05-18 19:55 ` Dai Ngo
2026-05-19 6:30 ` Christoph Hellwig
2026-05-19 13:44 ` Dai Ngo
2026-05-19 14:59 ` Darrick J. Wong
2026-05-19 17:34 ` Dai Ngo
2026-05-20 8:24 ` Christoph Hellwig [this message]
2026-05-20 15:09 ` Dai Ngo
2026-05-20 16:48 ` Darrick J. Wong
2026-05-20 17:32 ` Dai Ngo
2026-05-20 22:08 ` Sergey Bashirov
2026-05-15 11:50 ` Christoph Hellwig
2026-05-15 11:49 ` Christoph Hellwig
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