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From: Kevin Wolf <kwolf@redhat.com>
To: Fiona Ebner <f.ebner@proxmox.com>
Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org, hreitz@redhat.com,
	qemu-stable@nongnu.org
Subject: Re: [PATCH 0/3] block/export/fuse: set FUSE_DIRECT_IO_ALLOW_MMAP flag to fix regression
Date: Fri, 5 Jun 2026 17:33:12 +0200	[thread overview]
Message-ID: <aiLsOMEQDfCG3jht@redhat.com> (raw)
In-Reply-To: <20260506145424.10249-1-f.ebner@proxmox.com>

Am 06.05.2026 um 16:49 hat Fiona Ebner geschrieben:
> Commit 8599559580 ("fuse: Set direct_io and parallel_direct_writes")
> broke use cases that require mmap() with MAP_SHARED on the export. In
> particular, swtpm_setup using its 'file://' protocol requires this.
> This is mentioned in the kernel documentation [0]:
> 
> > To allow shared mmap, the FUSE_DIRECT_IO_ALLOW_MMAP flag may be
> > enabled in the FUSE_INIT reply.
> 
> [0]: https://www.kernel.org/doc/html/next/filesystems/fuse/fuse-io.html
> 
> Set the FUSE_DIRECT_IO_ALLOW_MMAP flag to restore compatibility with
> users requiring shared mmap.

Thanks, applied to the block branch.

Kevin



      parent reply	other threads:[~2026-06-05 15:34 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-06 14:49 [PATCH 0/3] block/export/fuse: set FUSE_DIRECT_IO_ALLOW_MMAP flag to fix regression Fiona Ebner
2026-05-06 14:49 ` [PATCH 1/3] block/export/fuse: use struct fuse_init_in Fiona Ebner
2026-05-06 14:49 ` [PATCH 2/3] block/export/fuse: set FUSE_DIRECT_IO_ALLOW_MMAP flag to fix regression Fiona Ebner
2026-05-06 14:49 ` [PATCH 3/3] iotests: test shared mmap for fuse export Fiona Ebner
2026-06-05 15:33 ` Kevin Wolf [this message]

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