initial code repo

[stor4nfv.git] / src / ceph / qa / workunits / direct_io / test_short_dio_read.c

diff --git a/src/ceph/qa/workunits/direct_io/test_short_dio_read.c b/src/ceph/qa/workunits/direct_io/test_short_dio_read.c
new file mode 100644 (file)
index 0000000..5024855
--- /dev/null
+++ b/src/ceph/qa/workunits/direct_io/test_short_dio_read.c
@@ -0,0 +1,57 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+int main()
+{
+        char buf[409600];
+        ssize_t r;
+       int err;
+       int fd = open("shortfile", O_WRONLY|O_CREAT, 0644);
+
+       if (fd < 0) {
+               err = errno;
+               printf("error: open() failed with: %d (%s)\n", err, strerror(err));
+               exit(err);
+       }
+
+       printf("writing first 3 bytes of 10k file\n");
+        r = write(fd, "foo", 3);
+       if (r == -1) {
+               err = errno;
+               printf("error: write() failed with: %d (%s)\n", err, strerror(err));
+               close(fd);
+               exit(err);
+       }
+        r = ftruncate(fd, 10000);
+       if (r == -1) {
+               err = errno;
+               printf("error: ftruncate() failed with: %d (%s)\n", err, strerror(err));
+               close(fd);
+               exit(err);
+       }
+       
+        fsync(fd);
+        close(fd);
+
+       printf("reading O_DIRECT\n");
+        fd = open("shortfile", O_RDONLY|O_DIRECT);
+       if (fd < 0) {
+               err = errno;
+               printf("error: open() failed with: %d (%s)\n", err, strerror(err));
+               exit(err);
+       }
+
+        r = read(fd, buf, sizeof(buf));
+        close(fd);
+
+        printf("got %d\n", (int)r);
+       if (r != 10000)
+               return 1;
+        return 0;
+}