fs: add ksys_getdents64() helper; remove in-kernel calls to sys_getdents64()

Using this helper allows us to avoid the in-kernel calls to the
sys_getdents64() 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_getdents64().

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

diff --git a/fs/readdir.c b/fs/readdir.c
index 1b83b0a..d97f548 100644 (file)
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -292,8 +292,8 @@ efault:
        return -EFAULT;
 }
 
-SYSCALL_DEFINE3(getdents64, unsigned int, fd,
-               struct linux_dirent64 __user *, dirent, unsigned int, count)
+int ksys_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent,
+                   unsigned int count)
 {
        struct fd f;
        struct linux_dirent64 __user * lastdirent;
@@ -326,6 +326,13 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
        return error;
 }
 
+
+SYSCALL_DEFINE3(getdents64, unsigned int, fd,
+               struct linux_dirent64 __user *, dirent, unsigned int, count)
+{
+       return ksys_getdents64(fd, dirent, count);
+}
+
 #ifdef CONFIG_COMPAT
 struct compat_old_linux_dirent {
        compat_ulong_t  d_ino;

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index f9df17d..c056aff 100644 (file)
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -955,6 +955,8 @@ ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count);
 int ksys_chdir(const char __user *filename);
 int ksys_fchmod(unsigned int fd, umode_t mode);
 int ksys_fchown(unsigned int fd, uid_t user, gid_t group);
+int ksys_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent,
+                   unsigned int count);
 
 /*
  * The following kernel syscall equivalents are just wrappers to fs-internal

diff --git a/init/initramfs.c b/init/initramfs.c
index 5f2ff1d..13643c4 100644 (file)
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -579,7 +579,7 @@ static void __init clean_rootfs(void)
        }
 
        dirp = buf;
-       num = sys_getdents64(fd, dirp, BUF_SIZE);
+       num = ksys_getdents64(fd, dirp, BUF_SIZE);
        while (num > 0) {
                while (num > 0) {
                        struct kstat st;
@@ -599,7 +599,7 @@ static void __init clean_rootfs(void)
                }
                dirp = buf;
                memset(buf, 0, BUF_SIZE);
-               num = sys_getdents64(fd, dirp, BUF_SIZE);
+               num = ksys_getdents64(fd, dirp, BUF_SIZE);
        }
 
        ksys_close(fd);