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Subject[PATCH 09/45] fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()
Date
Using the ksys_truncate() wrapper allows us to get rid of in-kernel
calls to the sys_truncate() syscall. The ksys_ prefix denotes that this
function is meant as a drop-in replacement for the syscall. In
particular, it uses the same calling convention as sys_truncate().

This patch is part of a series which tries to remove in-kernel calls to
syscalls. On this basis, the syscall entry path can be streamlined.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
arch/mips/kernel/linux32.c | 2 +-
arch/parisc/kernel/sys_parisc.c | 6 +++---
arch/powerpc/kernel/sys_ppc32.c | 2 +-
arch/s390/kernel/compat_linux.c | 2 +-
arch/sparc/kernel/sys_sparc32.c | 2 +-
arch/x86/ia32/sys_ia32.c | 3 ++-
fs/open.c | 2 +-
include/linux/syscalls.h | 7 +++++++
8 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 740eee40c668..12421ba4318a 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -82,7 +82,7 @@ struct rlimit32 {
SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
{
- return sys_truncate(path, merge_64(a2, a3));
+ return ksys_truncate(path, merge_64(a2, a3));
}

SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 59b315d6d194..3c1d788ab3ed 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -292,7 +292,7 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
asmlinkage long parisc_truncate64(const char __user * path,
unsigned int high, unsigned int low)
{
- return sys_truncate(path, (long)high << 32 | low);
+ return ksys_truncate(path, (long)high << 32 | low);
}

asmlinkage long parisc_ftruncate64(unsigned int fd,
@@ -305,7 +305,7 @@ asmlinkage long parisc_ftruncate64(unsigned int fd,
* are identical on LP64 */
asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
{
- return sys_truncate(path, length);
+ return ksys_truncate(path, length);
}
asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
{
@@ -320,7 +320,7 @@ asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg
asmlinkage long parisc_truncate64(const char __user * path,
unsigned int high, unsigned int low)
{
- return sys_truncate64(path, (loff_t)high << 32 | low);
+ return ksys_truncate(path, (loff_t)high << 32 | low);
}

asmlinkage long parisc_ftruncate64(unsigned int fd,
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index f41cb34c84c8..eb79138bd44d 100644
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -94,7 +94,7 @@ compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 co
asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
unsigned long high, unsigned long low)
{
- return sys_truncate(path, (high << 32) | low);
+ return ksys_truncate(path, (high << 32) | low);
}

asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index fb902b591bb4..0788df0443ba 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -302,7 +302,7 @@ COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,

COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
{
- return sys_truncate(path, (unsigned long)high << 32 | low);
+ return ksys_truncate(path, (unsigned long)high << 32 | low);
}

COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
diff --git a/arch/sparc/kernel/sys_sparc32.c b/arch/sparc/kernel/sys_sparc32.c
index f8d357540748..4ceb2e591688 100644
--- a/arch/sparc/kernel/sys_sparc32.c
+++ b/arch/sparc/kernel/sys_sparc32.c
@@ -57,7 +57,7 @@ asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, u
if ((int)high < 0)
return -EINVAL;
else
- return sys_truncate(path, (high << 32) | low);
+ return ksys_truncate(path, (high << 32) | low);
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
index 9f5c25093e7a..91ed2c256dac 100644
--- a/arch/x86/ia32/sys_ia32.c
+++ b/arch/x86/ia32/sys_ia32.c
@@ -54,7 +54,8 @@
COMPAT_SYSCALL_DEFINE3(x86_truncate64, const char __user *, filename,
unsigned long, offset_low, unsigned long, offset_high)
{
- return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
+ return ksys_truncate(filename,
+ ((loff_t) offset_high << 32) | offset_low);
}

COMPAT_SYSCALL_DEFINE3(x86_ftruncate64, unsigned int, fd,
diff --git a/fs/open.c b/fs/open.c
index 8a42a2961130..2e816fc7bd56 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -128,7 +128,7 @@ long vfs_truncate(const struct path *path, loff_t length)
}
EXPORT_SYMBOL_GPL(vfs_truncate);

-static long do_sys_truncate(const char __user *pathname, loff_t length)
+long do_sys_truncate(const char __user *pathname, loff_t length)
{
unsigned int lookup_flags = LOOKUP_FOLLOW;
struct path path;
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 1970c6817289..535cc3cf516a 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1045,6 +1045,13 @@ static inline long ksys_access(const char __user *filename, int mode)
return do_faccessat(AT_FDCWD, filename, mode);
}

+extern long do_sys_truncate(const char __user *pathname, loff_t length);
+
+static inline long ksys_truncate(const char __user *pathname, loff_t length)
+{
+ return do_sys_truncate(pathname, length);
+}
+
extern long do_sys_ftruncate(unsigned int fd, loff_t length, int small);

static inline long ksys_ftruncate(unsigned int fd, unsigned long length)
--
2.16.2
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