linux-kernel - [PATCH 09/56] fs/bad_inode: support compiling out splice

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Message-Id: <1415913813-362-10-git-send-email-pieter@boesman.nl>
Date:	Thu, 13 Nov 2014 22:22:46 +0100
From:	Pieter Smith <pieter@...sman.nl>
To:	pieter@...sman.nl
Cc:	Josh Triplett <josh@...htriplett.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 09/56] fs/bad_inode: support compiling out splice

Compile out splice support from bad_inode when the splice-family of syscalls is
not supported by the system (i.e. CONFIG_SYSCALL_SPLICE is undefined).

add/remove: 0/2 grow/shrink: 0/0 up/down: 0/-12 (-12)
function                                     old     new   delta
bad_file_splice_write                          6       -      -6
bad_file_splice_read                           6       -      -6

Signed-off-by: Pieter Smith <pieter@...sman.nl>
---
 fs/bad_inode.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index afd2b44..ccb076d 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -131,14 +131,16 @@ static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
 	return -EIO;
 }
 
-static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
+static ssize_t __maybe_unused bad_file_splice_write(
+			struct pipe_inode_info *pipe,
 			struct file *out, loff_t *ppos, size_t len,
 			unsigned int flags)
 {
 	return -EIO;
 }
 
-static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
+static ssize_t __maybe_unused bad_file_splice_read(
+			struct file *in, loff_t *ppos,
 			struct pipe_inode_info *pipe, size_t len,
 			unsigned int flags)
 {
@@ -168,8 +170,8 @@ static const struct file_operations bad_file_ops =
 	.get_unmapped_area = bad_file_get_unmapped_area,
 	.check_flags	= bad_file_check_flags,
 	.flock		= bad_file_flock,
-	.splice_write	= bad_file_splice_write,
-	.splice_read	= bad_file_splice_read,
+	SPLICE_WRITE_INIT(bad_file_splice_write)
+	SPLICE_READ_INIT(bad_file_splice_read)
 };
 
 static int bad_inode_create (struct inode *dir, struct dentry *dentry,
-- 
1.9.1

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