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Subject[PATCH 07/45] fs: add do_vmsplice() helper; remove in-kernel call to syscall
Date
Using the fs-internal do_vmsplice() helper allows us to get rid of the
fs-internal call to the sys_vmsplice() syscall.

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>
---
fs/splice.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/fs/splice.c b/fs/splice.c
index 39e2dc01ac12..005d09cf3fa8 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1331,8 +1331,8 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *uiov,
* Currently we punt and implement it as a normal copy, see pipe_to_user().
*
*/
-SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
- unsigned long, nr_segs, unsigned int, flags)
+static long do_vmsplice(int fd, const struct iovec __user *iov,
+ unsigned long nr_segs, unsigned int flags)
{
struct fd f;
long error;
@@ -1358,6 +1358,12 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
return error;
}

+SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
+ unsigned long, nr_segs, unsigned int, flags)
+{
+ return do_vmsplice(fd, iov, nr_segs, flags);
+}
+
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32,
unsigned int, nr_segs, unsigned int, flags)
@@ -1375,7 +1381,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io
put_user(v.iov_len, &iov[i].iov_len))
return -EFAULT;
}
- return sys_vmsplice(fd, iov, nr_segs, flags);
+ return do_vmsplice(fd, iov, nr_segs, flags);
}
#endif

--
2.16.2
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