Fix compat with glibc 2.36
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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Daniel P. Berrangé
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0011-linux-user-fix-compat-with-glibc-2.36-sys-mount.h.patch
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0011-linux-user-fix-compat-with-glibc-2.36-sys-mount.h.patch
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From a7f14aae85022007a4c77e0792a1abb0509a08eb Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
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Date: Tue, 2 Aug 2022 12:34:23 -0400
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Subject: [PATCH] linux-user: fix compat with glibc >= 2.36 sys/mount.h
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The latest glibc 2.36 has extended sys/mount.h so that it
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defines the FSCONFIG_* enum constants. These are historically
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defined in linux/mount.h, and thus if you include both headers
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the compiler complains:
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In file included from /usr/include/linux/fs.h:19,
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from ../linux-user/syscall.c:98:
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/usr/include/linux/mount.h:95:6: error: redeclaration of 'enum fsconfig_command'
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95 | enum fsconfig_command {
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| ^~~~~~~~~~~~~~~~
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In file included from ../linux-user/syscall.c:31:
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/usr/include/sys/mount.h:189:6: note: originally defined here
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189 | enum fsconfig_command
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| ^~~~~~~~~~~~~~~~
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/usr/include/linux/mount.h:96:9: error: redeclaration of enumerator 'FSCONFIG_SET_FLAG'
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96 | FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
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| ^~~~~~~~~~~~~~~~~
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/usr/include/sys/mount.h:191:3: note: previous definition of 'FSCONFIG_SET_FLAG' with type 'enum fsconfig_command'
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191 | FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
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| ^~~~~~~~~~~~~~~~~
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...snip...
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QEMU doesn't include linux/mount.h, but it does use
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linux/fs.h and thus gets linux/mount.h indirectly.
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glibc acknowledges this problem but does not appear to
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be intending to fix it in the forseeable future, simply
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documenting it as a known incompatibility with no
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workaround:
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https://sourceware.org/glibc/wiki/Release/2.36#Usage_of_.3Clinux.2Fmount.h.3E_and_.3Csys.2Fmount.h.3E
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https://sourceware.org/glibc/wiki/Synchronizing_Headers
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To address this requires either removing use of sys/mount.h
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or linux/fs.h, despite QEMU needing declarations from
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both.
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This patch removes linux/fs.h, meaning we have to define
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various FS_IOC constants that are now unavailable.
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Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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---
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linux-user/syscall.c | 18 ++++++++++++++++++
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meson.build | 2 ++
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2 files changed, 20 insertions(+)
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diff --git a/linux-user/syscall.c b/linux-user/syscall.c
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index b27a6552aa..52d178afe7 100644
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--- a/linux-user/syscall.c
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+++ b/linux-user/syscall.c
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@@ -95,7 +95,25 @@
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#include <linux/soundcard.h>
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#include <linux/kd.h>
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#include <linux/mtio.h>
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+
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+#ifdef HAVE_SYS_MOUNT_FSCONFIG
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+/*
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+ * glibc >= 2.36 linux/mount.h conflicts with sys/mount.h,
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+ * which in turn prevents use of linux/fs.h. So we have to
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+ * define the constants ourselves for now.
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+ */
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+#define FS_IOC_GETFLAGS _IOR('f', 1, long)
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+#define FS_IOC_SETFLAGS _IOW('f', 2, long)
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+#define FS_IOC_GETVERSION _IOR('v', 1, long)
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+#define FS_IOC_SETVERSION _IOW('v', 2, long)
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+#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
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+#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
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+#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
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+#define FS_IOC32_GETVERSION _IOR('v', 1, int)
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+#define FS_IOC32_SETVERSION _IOW('v', 2, int)
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+#else
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#include <linux/fs.h>
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+#endif
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#include <linux/fd.h>
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#if defined(CONFIG_FIEMAP)
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#include <linux/fiemap.h>
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diff --git a/meson.build b/meson.build
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index 294e9a8f32..30a380752c 100644
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--- a/meson.build
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+++ b/meson.build
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@@ -1963,6 +1963,8 @@ config_host_data.set('HAVE_OPTRESET',
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cc.has_header_symbol('getopt.h', 'optreset'))
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config_host_data.set('HAVE_IPPROTO_MPTCP',
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cc.has_header_symbol('netinet/in.h', 'IPPROTO_MPTCP'))
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+config_host_data.set('HAVE_SYS_MOUNT_FSCONFIG',
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+ cc.has_header_symbol('sys/mount.h', 'FSCONFIG_SET_FLAG'))
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# has_member
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config_host_data.set('HAVE_SIGEV_NOTIFY_THREAD_ID',
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--
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2.37.1
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@ -317,7 +317,7 @@ Obsoletes: %{name}-system-unicore32-core <= %{epoch}:%{version}-%{release}
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%endif
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# To prevent rpmdev-bumpspec breakage
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%global baserelease 8
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%global baserelease 9
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Summary: QEMU is a FAST! processor emulator
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Name: qemu
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@ -352,6 +352,8 @@ Patch: 0007-virtio-scsi-move-request-related-items-from-.h-to-.c.patch
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Patch: 0008-Disable-flakey-dbus-display-test.patch
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Patch: 0009-Fix-iotests-with-modules-and-qemu-system-s390x.patch
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Patch: 0010-Skip-iotests-entirely.patch
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# Not yet upstream, fix glibc 2.36 compat
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Patch: 0011-linux-user-fix-compat-with-glibc-2.36-sys-mount.h.patch
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BuildRequires: meson >= %{meson_version}
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BuildRequires: zlib-devel
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@ -2716,6 +2718,9 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
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%changelog
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* Tue Aug 2 2022 Daniel P. Berrangé <berrange@redhat.com> - 7.0.0-9
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- Fix compat with glibc 2.36 headers
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* Mon Jul 25 2022 Paolo Bonzini <pbonzini@redhat.com> - 2:7.0.0-8
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- Replace pcre-static dependency with pcre2-static, to adjust for glib switching
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