[PATCH v5 4/7] fs/fuse: support compiling out splice

[Pieter Smith <pieter@boesman.nl>]

To implement splice support, fs/fuse makes use of nosteal_pipe_buf_ops. This
struct is exported by fs/splice. The goal of the larger patch set is to
completely compile out fs/splice, so uses of the exported struct need to be
compiled out along with fs/splice.

This patch therefore compiles out splice support in fs/fuse when
CONFIG_SYSCALL_SPLICE is undefined.

Signed-off-by: Pieter Smith <pieter@boesman.nl>
---
 fs/fuse/dev.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ca88731..e984302 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1191,8 +1191,9 @@ __releases(fc->lock)
  * request_end().  Otherwise add it to the processing list, and set
  * the 'sent' flag.
  */
-static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
-				struct fuse_copy_state *cs, size_t nbytes)
+static ssize_t __maybe_unused
+fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
+		 struct fuse_copy_state *cs, size_t nbytes)
 {
 	int err;
 	struct fuse_req *req;
@@ -1291,6 +1292,7 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
 	return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs));
 }
 
+#ifdef CONFIG_SYSCALL_SPLICE
 static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
 				    struct pipe_inode_info *pipe,
 				    size_t len, unsigned int flags)
@@ -1368,6 +1370,9 @@ out:
 	kfree(bufs);
 	return ret;
 }
+#else /* CONFIG_SYSCALL_SPLICE */
+#define fuse_dev_splice_read NULL
+#endif
 
 static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size,
 			    struct fuse_copy_state *cs)
-- 
2.1.0