To test read/write between a mmap area of one file
and another file directly, with different size.
Signed-off-by: Xiong Zhou <xzhou@xxxxxxxxxx>
---
.gitignore | 1 +
src/Makefile | 2 +-
src/t_mmap_dio.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 83 insertions(+), 1 deletion(-)
create mode 100644 src/t_mmap_dio.c
diff --git a/.gitignore b/.gitignore
index 7dcea14..48a40a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -129,6 +129,7 @@
/src/cloner
/src/renameat2
/src/t_rename_overwrite
+/src/t_mmap_dio
# dmapi/ binaries
/dmapi/src/common/cmd/read_invis
diff --git a/src/Makefile b/src/Makefile
index 94d74aa..eb5a56c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -12,7 +12,7 @@ TARGETS = dirstress fill fill2 getpagesize holes lstat64 \
godown resvtest writemod makeextents itrash rename \
multi_open_unlink dmiperf unwritten_sync genhashnames t_holes \
t_mmap_writev t_truncate_cmtime dirhash_collide t_rename_overwrite \
- holetest t_truncate_self
+ holetest t_truncate_self t_mmap_dio
LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
preallo_rw_pattern_writer ftrunc trunc fs_perms testx looptest \
diff --git a/src/t_mmap_dio.c b/src/t_mmap_dio.c
new file mode 100644
index 0000000..545e900
--- /dev/null
+++ b/src/t_mmap_dio.c
@@ -0,0 +1,81 @@
+/*
+ * This programme was originally written by
+ * Jeff Moyer <jmoyer@xxxxxxxxxx>
+ */
+#define _GNU_SOURCE 1
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <libaio.h>
+#include <errno.h>
+#include <sys/time.h>
+
+void usage(char *prog)
+{
+ fprintf(stderr,
+ "usage: %s <source file> <dest file> <test size>\n",
+ prog);
+ exit(1);
+}
+
+void err_exit(char *op, unsigned long len)
+{
+ fprintf(stderr, "%s(%s) len %lu\n",
+ op, strerror(errno), len);
+ exit(1);
+}
+
+int main(int argc, char **argv)
+{
+ int fd, fd2, ret;
+ char *map;
+ unsigned long len;
+
+ if (argc < 3)
+ usage(basename(argv[0]));
+
+ len = strtoul(argv[3], NULL, 10);
+ if (errno == ERANGE)
+ err_exit("strtoul", 0);
+
+ /* Open source file and mmap*/
+ fd = open(argv[1], O_RDWR, 0644);
+ if (fd < 0)
+ err_exit("open s", len);
+
+ map = (char *)mmap(NULL, len,
+ PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ if (map == MAP_FAILED)
+ err_exit("mmap", len);
+
+ /* Open dest file with O_DIRECT */
+ fd2 = open(argv[2], O_RDWR|O_DIRECT, 0644);
+ if (fd2 < 0)
+ err_exit("open d", len);
+
+ /* First, test storing to dest file from source mapping */
+ ret = write(fd2, map, len);
+ if (ret != len)
+ err_exit("write", len);
+
+ ret = (int)lseek(fd2, 0, SEEK_SET);
+ if (ret == -1)
+ err_exit("lseek", len);
+
+ /* Next, test reading from dest file into source mapping */
+ ret = read(fd2, map, len);
+ if (ret != len)
+ err_exit("read", len);
+ ret = msync(map, len, MS_SYNC);
+ if (ret < 0)
+ err_exit("msync", len);
+
+ ret = munmap(map, len);
+ if (ret < 0)
+ err_exit("munmap", len);
+
+ exit(0);
+}
--
1.8.3.1
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