X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=wrapper%2Fsplice.c;fp=wrapper%2Fsplice.c;h=edc499c835efd2278e128d37d6ab8be5d8fb322c;hb=5dd620faf35aaa3f5633435e22556d843f9cd4a5;hp=0000000000000000000000000000000000000000;hpb=254ec7bc4c72da11a4e3f2c90904b111a06a2c55;p=lttng-modules.git

diff --git a/wrapper/splice.c b/wrapper/splice.c
new file mode 100644
index 00000000..edc499c8
--- /dev/null
+++ b/wrapper/splice.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+ *
+ * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
+ * available, else we need to have a kernel that exports this function to GPL
+ * modules.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#ifdef CONFIG_KALLSYMS
+
+#include <linux/kallsyms.h>
+#include <linux/fs.h>
+#include <linux/splice.h>
+
+static
+ssize_t (*splice_to_pipe_sym)(struct pipe_inode_info *pipe,
+			      struct splice_pipe_desc *spd);
+
+ssize_t wrapper_splice_to_pipe(struct pipe_inode_info *pipe,
+			       struct splice_pipe_desc *spd)
+{
+	if (!splice_to_pipe_sym)
+		splice_to_pipe_sym = (void *) kallsyms_lookup_name("splice_to_pipe");
+	if (splice_to_pipe_sym) {
+		return splice_to_pipe_sym(pipe, spd);
+	} else {
+		printk(KERN_WARNING "LTTng: splice_to_pipe symbol lookup failed.\n");
+		return -ENOSYS;
+	}
+}
+
+#else
+
+#include <linux/fs.h>
+#include <linux/splice.h>
+
+ssize_t wrapper_splice_to_pipe(struct pipe_inode_info *pipe,
+			       struct splice_pipe_desc *spd)
+{
+	return splice_to_pipe(pipe, spd);
+}
+
+#endif