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Upstream status: Being tested; not yet presented upstream.
From 6f9b9584f43d9d6058e10048dd0dfc5d0eff88c4 Mon Sep 17 00:00:00 2001
From: Janneke Nieuwenhuizen <janneke@gnu.org>
Date: Fri, 15 May 2026 10:12:30 +0200
Subject: [PATCH] shmem: support xattr gnu.* namespace for the Hurd
The Hurd gained[0] support for moving the translator and author
fields out of the inode and into the "gnu.*" xattr namespace.
In anticipation of that, an xattr INDEX was reserved[1]. The Hurd has
now been brought into compliance[2] with that, and so has ext4[3].
This patch adds support for reading and writing such attributes from
a Linux tmpfs; you can now do something like
mkdir -p hurd-root
mount -t tmpfs -o size=2M tmpfs hurd-root
mkdir -p hurd-root/servers/socket
touch hurd-root/servers/socket/1
setfattr --name=gnu.translator --value='"/hurd/pflocal\0"' \
hurd-root/servers/socket/1
getfattr --name=gnu.translator hurd-root/servers/socket/1
# file: 1
gnu.translator="/hurd/pflocal"
to setup a pipe translator, which is being used to create an
initial file-system image for the Hurd from GNU Guix[4].
[0] https://summerofcode.withgoogle.com/projects/#5869799859027968
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3980bd3b406addb327d858aebd19e229ea340b9a
[2] https://git.savannah.gnu.org/cgit/hurd/hurd.git/commit/?id=a04c7bf83172faa7cb080fbe3b6c04a8415ca645
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=88ee9d571b6d8ed345f877e05f685814412e359b
[4] https://git.savannah.gnu.org/cgit/guix.git/log/?h=wip-hurd-vm
---
mm/shmem.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/mm/shmem.c b/mm/shmem.c
index 3b5dc21b323c..5d60aa4dba92 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -15,6 +15,7 @@
* Extended attribute support for tmpfs:
* Copyright (c) 2004, Luke Kenneth Casson Leighton <lkcl@lkcl.net>
* Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
+ * Copyright (C) 2026 Janneke Nieuwenhuizen <janneke@gnu.org>
*
* tiny-shmem:
* Copyright (c) 2004, 2008 Matt Mackall <mpm@selenic.com>
@@ -4371,10 +4372,17 @@ static const struct xattr_handler shmem_user_xattr_handler = {
.set = shmem_xattr_handler_set,
};
+static const struct xattr_handler shmem_hurd_xattr_handler = {
+ .prefix = XATTR_HURD_PREFIX,
+ .get = shmem_xattr_handler_get,
+ .set = shmem_xattr_handler_set,
+};
+
static const struct xattr_handler * const shmem_xattr_handlers[] = {
&shmem_security_xattr_handler,
&shmem_trusted_xattr_handler,
&shmem_user_xattr_handler,
+ &shmem_hurd_xattr_handler,
NULL
};
--
2.54.0
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