package/systemd: fix build with recent kernels

Backport a patch from upstream that adds the magic number for the
bcachefs superblock. Otherwise, systemd 254.13 fails to compile with
the latest kernel versions.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f3c1f667dcc300eb7205aa3e1731ba3377a8e48d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/systemd/0002-basic-add-bcachefs-magic.patch

@@ -0,0 +1,53 @@
+From e5ff9b585d7dc54f50085d518d7d588c250b0690 Mon Sep 17 00:00:00 2001
+From: Chris Packham <chris.packham@alliedtelesis.co.nz>
+Date: Fri, 31 May 2024 09:51:38 +1200
+Subject: [PATCH] basic: Add BCACHEFS magic
+
+Import magic.h from Linux 6.9 to get the definition of
+BCACHEFS_SUPER_MAGIC. Update filesystems-gperf.gperf to add knowledge of
+bcachefs.
+
+This fixes the following error building against a bleeding edge kernel.
+```
+src/basic/meson.build:234:8: ERROR: Problem encountered: Unknown filesystems defined in kernel headers:
+
+Filesystem found in kernel header but not in filesystems-gperf.gperf: BCACHEFS_SUPER_MAGIC
+```
+
+Upstream: https://github.com/systemd/systemd/commit/201148b08de65de004d10679a8c3d201cc08fb28
+Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
+---
+ src/basic/filesystems-gperf.gperf | 1 +
+ src/basic/missing_magic.h         | 7 +++++++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/src/basic/filesystems-gperf.gperf b/src/basic/filesystems-gperf.gperf
+index 1cd66b5a5f..c82fe98227 100644
+--- a/src/basic/filesystems-gperf.gperf
++++ b/src/basic/filesystems-gperf.gperf
+@@ -28,6 +28,7 @@ afs,             {AFS_FS_MAGIC, AFS_SUPER_MAGIC}
+ anon_inodefs,    {ANON_INODE_FS_MAGIC}
+ autofs,          {AUTOFS_SUPER_MAGIC}
+ balloon-kvm,     {BALLOON_KVM_MAGIC}
++bcachefs,        {BCACHEFS_SUPER_MAGIC}
+ bdev,            {BDEVFS_MAGIC}
+ binder,          {BINDERFS_SUPER_MAGIC}
+ binfmt_misc,     {BINFMTFS_MAGIC}
+diff --git a/src/basic/missing_magic.h b/src/basic/missing_magic.h
+index 82d71c8ad1..b3d2ee9f57 100644
+--- a/src/basic/missing_magic.h
++++ b/src/basic/missing_magic.h
+@@ -197,3 +197,10 @@
+ #ifndef NTFS3_SUPER_MAGIC
+ #define NTFS3_SUPER_MAGIC 0x7366746e
+ #endif
++
++/* Added in Linux commit e2f48c48090dea172c0c571101041de64634dae5. Remove when next sync'd */
++#ifndef BCACHEFS_SUPER_MAGIC
++#  define BCACHEFS_SUPER_MAGIC 0xca451a4e
++#else
++assert_cc(BCACHEFS_SUPER_MAGIC == 0xca451a4e)
++#endif
+--
+2.45.1
+