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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-13 23:51:17 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:16:03 +0300
commit76847e4344350970e1c2e27c28b5abb3c588c5b3 (patch)
tree3562d369e5299a200ae49fd42e5b6084a594cf2f /fs/read_write.c
parentcbb60b924b9f3e4d7c67a1c9dcf981718f926e4e (diff)
downloadlinux-76847e4344350970e1c2e27c28b5abb3c588c5b3.tar.xz
fs: add ksys_lseek() helper; remove in-kernel calls to sys_lseek()
Using this helper allows us to avoid the in-kernel calls to the sys_lseek() 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_lseek(). 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>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 8e8f0b4f52e2..b38b008a078e 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -301,7 +301,7 @@ loff_t vfs_llseek(struct file *file, loff_t offset, int whence)
}
EXPORT_SYMBOL(vfs_llseek);
-SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
+off_t ksys_lseek(unsigned int fd, off_t offset, unsigned int whence)
{
off_t retval;
struct fd f = fdget_pos(fd);
@@ -319,10 +319,15 @@ SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
return retval;
}
+SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
+{
+ return ksys_lseek(fd, offset, whence);
+}
+
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence)
{
- return sys_lseek(fd, offset, whence);
+ return ksys_lseek(fd, offset, whence);
}
#endif