101 lines
4.0 KiB
Diff
101 lines
4.0 KiB
Diff
From 3cd3df2a9584e6f753bb62a0028bd67124ab5532 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 12:41:34 -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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Tested-by: Richard W.M. Jones <rjones@redhat.com>
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Message-Id: <20220802164134.1851910-1-berrange@redhat.com>
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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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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 ef53feb5ab45..f4091212027c 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 294e9a8f329e..30a380752c0d 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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