This is a simple C program that I used for calling the copy system call.
Usage: ./nfscopy /nfs/original.txt /nfs/copy.txt
---
nfscopy.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
create mode 100644 nfscopy.c
diff --git a/nfscopy.c b/nfscopy.c
new file mode 100644
index 0000000..535673e
--- /dev/null
+++ b/nfscopy.c
@@ -0,0 +1,64 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define SYS_COPY_RANGE 323
+
+int do_copy(int f_in, int f_out, loff_t f_size)
+{
+ loff_t offset = 0;
+ ssize_t ret;
+
+ while (offset < f_size) {
+ size_t size = f_size - offset;
+ if ((size + offset) != f_size)
+ size = INT_MAX - 1;
+
+ ret = syscall(SYS_COPY_RANGE, f_in, &offset, f_out, &offset, size, 0);
+ if (ret < 0) {
+ printf("Copy error: %s\n", strerror(errno));
+ return ret;
+ }
+ }
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ int f_in, f_out, ret;
+ struct stat fstat;
+
+ if (argc != 3) {
+ printf("Usage: %s f_in f_out\n", argv[0]);
+ exit(1);
+ }
+
+ f_in = open(argv[1], O_RDONLY);
+ if (f_in < 0) {
+ printf("%s: %s\n", argv[1], strerror(errno));
+ exit(1);
+ }
+
+ if (stat(argv[1], &fstat) < 0) {
+ printf("%s: %s\n", argv[1], strerror(errno));
+ exit(1);
+ }
+
+ f_out = open(argv[2], O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+ if (f_out < 0) {
+ printf("%s: %s\n", argv[2], strerror(errno));
+ exit(1);
+ }
+
+ ret = do_copy(f_in, f_out, fstat.st_size);
+
+ fsync(f_out);
+ close(f_in);
+ close(f_out);
+ return ret;
+}
--
2.5.0
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