linux-kernel - [PATCH 04/56] fs: Macros to define splice file

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Date:	Thu, 13 Nov 2014 22:22:41 +0100
From:	Pieter Smith <pieter@...sman.nl>
To:	pieter@...sman.nl
Cc:	Josh Triplett <josh@...htriplett.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 04/56] fs: Macros to define splice file_operations

Provides a CONFIG_SYSCALL_SPLICE compatible way of defining the .splice_read
and .splice_write file_operations so that they can later be compiled out when
the kernel is configured without the splice-family syscalls

Signed-off-by: Pieter Smith <pieter@...sman.nl>
---
 include/linux/fs.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9418772..a88de9f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1512,6 +1512,32 @@ struct file_operations {
 	int (*show_fdinfo)(struct seq_file *m, struct file *f);
 };
 
+#ifdef CONFIG_SYSCALL_SPLICE
+
+/*
+ * Define and init the splice_read member of a file_operations struct
+ */
+#define SPLICE_READ_INIT(read) .splice_read = read,
+
+/*
+ * Define and init the splice_read member of a file_operations struct
+ */
+#define SPLICE_WRITE_INIT(write) .splice_write = write,
+
+#else /* #ifdef CONFIG_SYSCALL_SPLICE */
+
+/*
+ * Define and init the splice_read member of a file_operations struct
+ */
+#define SPLICE_READ_INIT(read)
+
+/*
+ * Define and init the splice_read member of a file_operations struct
+ */
+#define SPLICE_WRITE_INIT(write)
+
+#endif /* #ifdef CONFIG_SYSCALL_SPLICE */
+
 struct inode_operations {
 	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
 	void * (*follow_link) (struct dentry *, struct nameidata *);
-- 
1.9.1

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