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Message-Id: <1283268619-10728-2-git-send-email-namhyung@gmail.com>
Date: Wed, 1 Sep 2010 00:30:18 +0900
From: Namhyung Kim <namhyung@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Sam Ravnborg <sam@...nborg.org>, Arnd Bergmann <arnd@...db.de>,
Phillip Lougher <phillip@...gher.demon.co.uk>,
Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/2] init: add sys-wrapper.h
sys-wrapper.h contains wrapper functions for various syscalls used in init
code. This wrappers handle proper address space conversion so that it can
remove a lot of warnings from sparse.
Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
init/sys-wrapper.h | 216 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 216 insertions(+), 0 deletions(-)
create mode 100644 init/sys-wrapper.h
diff --git a/init/sys-wrapper.h b/init/sys-wrapper.h
new file mode 100644
index 0000000..10109b6
--- /dev/null
+++ b/init/sys-wrapper.h
@@ -0,0 +1,216 @@
+/*
+ * wrappers for various syscalls for use in the init code
+ *
+ * Copyright (C) 2010 Namhyung Kim <namhyung@...il.com>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/dirent.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+
+
+#define kernel_sys_call(call, ...) \
+({ \
+ long result; \
+ mm_segment_t old_fs = get_fs(); \
+ set_fs(KERNEL_DS); \
+ result = call(__VA_ARGS__); \
+ set_fs(old_fs); \
+ result; \
+})
+
+static inline int kernel_sys_mount(char *dev_name, char *dir_name, char *type,
+ unsigned long flags, void *data)
+{
+ return kernel_sys_call(sys_mount,
+ (char __user __force *) dev_name,
+ (char __user __force *) dir_name,
+ (char __user __force *) type,
+ flags,
+ (void __user __force *) data);
+}
+
+static inline int kernel_sys_umount(char *name, int flags)
+{
+ return kernel_sys_call(sys_umount,
+ (char __user __force *) name, flags);
+}
+
+static inline int kernel_sys_chroot(const char *pathname)
+{
+ return kernel_sys_call(sys_chroot,
+ (const char __user __force *) pathname);
+}
+
+static inline int kernel_sys_link(const char *oldname, const char *newname)
+{
+ return kernel_sys_call(sys_link,
+ (const char __user __force *) oldname,
+ (const char __user __force *) newname);
+}
+
+static inline int kernel_sys_unlink(const char *pathname)
+{
+ return kernel_sys_call(sys_unlink,
+ (const char __user __force *) pathname);
+}
+
+static inline int kernel_sys_newlstat(const char *filename,
+ struct stat *statbuf)
+{
+ return kernel_sys_call(sys_newlstat,
+ (const char __user __force *) filename,
+ (struct stat __user __force *) statbuf);
+}
+
+static inline int kernel_sys_mkdir(const char *pathname, int mode)
+{
+ return kernel_sys_call(sys_mkdir,
+ (const char __user __force *) pathname, mode);
+}
+
+static inline int kernel_sys_rmdir(const char *pathname)
+{
+ return kernel_sys_call(sys_rmdir,
+ (const char __user __force *) pathname);
+}
+
+static inline int kernel_sys_chdir(const char *pathname)
+{
+ return kernel_sys_call(sys_chdir,
+ (const char __user __force *) pathname);
+}
+
+static inline int kernel_sys_mknod(const char *filename,
+ int mode, unsigned dev)
+{
+ return kernel_sys_call(sys_mknod,
+ (const char __user __force *) filename,
+ mode, dev);
+}
+
+static inline int kernel_sys_chown(const char *filename,
+ uid_t user, gid_t group)
+{
+ return kernel_sys_call(sys_chown,
+ (const char __user __force *) filename,
+ user, group);
+}
+
+static inline int kernel_sys_chmod(const char *filename, mode_t mode)
+{
+ return kernel_sys_call(sys_chmod,
+ (const char __user __force *) filename, mode);
+}
+
+static inline int kernel_sys_open(const char *filename, int flags, int mode)
+{
+ return kernel_sys_call(sys_open,
+ (const char __user __force *) filename,
+ flags, mode);
+}
+
+static inline int kernel_sys_fchown(unsigned int fd, uid_t user, gid_t group)
+{
+ return sys_fchown(fd, user, group);
+}
+
+static inline int kernel_sys_fchmod(unsigned int fd, mode_t mode)
+{
+ return sys_fchmod(fd, mode);
+}
+
+static inline int kernel_sys_fchdir(unsigned int fd)
+{
+ return sys_fchdir(fd);
+}
+
+static inline int kernel_sys_ftruncate(unsigned int fd, unsigned long length)
+{
+ return sys_ftruncate(fd, length);
+}
+
+static inline int kernel_sys_read(unsigned int fd, char *buf, size_t count)
+{
+ return kernel_sys_call(sys_read,
+ fd, (char __user __force *) buf, count);
+}
+
+static inline int kernel_sys_write(unsigned int fd, const char *buf,
+ size_t count)
+{
+ return kernel_sys_call(sys_write,
+ fd, (const char __user __force *) buf, count);
+}
+
+static inline int kernel_sys_lseek(unsigned int fd, off_t offset,
+ unsigned int origin)
+{
+ return sys_lseek(fd, offset, origin);
+}
+
+static inline int kernel_sys_ioctl(unsigned int fd, unsigned int cmd,
+ unsigned long arg)
+{
+ return sys_ioctl(fd, cmd, arg);
+}
+
+static inline int kernel_sys_dup(unsigned int fd)
+{
+ return sys_dup(fd);
+}
+
+static inline int kernel_sys_close(unsigned int fd)
+{
+ return sys_close(fd);
+}
+
+static inline int kernel_sys_symlink(const char *oldname, const char *newname)
+{
+ return kernel_sys_call(sys_symlink,
+ (const char __user __force *) oldname,
+ (const char __user __force *) newname);
+}
+
+static inline int kernel_sys_lchown(const char *filename, uid_t user,
+ gid_t group)
+{
+ return kernel_sys_call(sys_lchown,
+ (const char __user __force *) filename,
+ user, group);
+}
+
+static inline int kernel_sys_getdents64(unsigned int fd,
+ struct linux_dirent64 *dirent,
+ unsigned int count)
+{
+ return kernel_sys_call(sys_getdents64,
+ fd,
+ (struct linux_dirent64 __user __force *) dirent,
+ count);
+}
+
+static inline int kernel_sys_access(const char *filename, int mode)
+{
+ return kernel_sys_call(sys_access,
+ (const char __user __force *) filename, mode);
+}
+
+static inline int kernel_sys_setsid(void)
+{
+ return sys_setsid();
+}
+
+static inline int kernel_sys_wait4(pid_t upid, int *stat_addr, int options,
+ struct rusage *ru)
+{
+ return kernel_sys_call(sys_wait4,
+ upid,
+ (int __user __force *) stat_addr,
+ options,
+ (struct rusage __user __force *) ru);
+}
--
1.7.2.2
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