[PATCH 1/2] splice: Make vmsplice public

[arni@dagur.eu]

From: Árni Dagur <arni@dagur.eu>

Create a public function do_vmsplice(), so that other parts of the
kernel can use it.

Signed-off-by: Árni Dagur <arni@dagur.eu>
---
 fs/splice.c            | 21 +++++++++++++++------
 include/linux/splice.h |  2 +-
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/fs/splice.c b/fs/splice.c
index 866d5c2367b2..2d653a20cced 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1270,6 +1270,20 @@ static int vmsplice_type(struct fd f, int *type)
 	return 0;
 }
 
+long do_vmsplice(struct file *file, struct iov_iter *iter, unsigned int flags)
+{
+	long error;
+
+	if (!iov_iter_count(iter))
+		error = 0;
+	else if (iov_iter_rw(iter) == WRITE)
+		error = vmsplice_to_pipe(file, iter, flags);
+	else
+		error = vmsplice_to_user(file, iter, flags);
+
+	return error;
+}
+
 /*
  * Note that vmsplice only really supports true splicing _from_ user memory
  * to a pipe, not the other way around. Splicing from user memory is a simple
@@ -1309,12 +1323,7 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
 	if (error < 0)
 		goto out_fdput;
 
-	if (!iov_iter_count(&iter))
-		error = 0;
-	else if (iov_iter_rw(&iter) == WRITE)
-		error = vmsplice_to_pipe(f.file, &iter, flags);
-	else
-		error = vmsplice_to_user(f.file, &iter, flags);
+	error = do_vmsplice(f.file, &iter, flags);
 
 	kfree(iov);
 out_fdput:
diff --git a/include/linux/splice.h b/include/linux/splice.h
index a55179fd60fc..44c0e612f652 100644
--- a/include/linux/splice.h
+++ b/include/linux/splice.h
@@ -81,9 +81,9 @@ extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
 extern long do_splice(struct file *in, loff_t *off_in,
 		      struct file *out, loff_t *off_out,
 		      size_t len, unsigned int flags);
-
 extern long do_tee(struct file *in, struct file *out, size_t len,
 		   unsigned int flags);
+extern long do_vmsplice(struct file *file, struct iov_iter *iter, unsigned int flags);
 
 /*
  * for dynamic pipe sizing
-- 
2.30.0