From a16fd1689ac4fd56078b20dc404d92ee50c22024 Mon Sep 17 00:00:00 2001
From: adilger <adilger>
Date: Fri, 18 Jul 2003 01:55:53 +0000
Subject: [PATCH] Commit small_write.c test. Move munlink into installed files
 so we can use it to delete bad files.

---
 lustre/tests/small_write.c | 132 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 lustre/tests/small_write.c

diff --git a/lustre/tests/small_write.c b/lustre/tests/small_write.c
new file mode 100644
index 0000000..8234450
--- /dev/null
+++ b/lustre/tests/small_write.c
@@ -0,0 +1,132 @@
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main (int argc, char **argv) {
+	int fd, i, rc;
+	unsigned long bytes, lbytes;
+	struct stat st;
+	char *str, *str2, *readbuf;
+
+	if (argc != 3) {
+		fprintf(stderr, "usage: %s <filename> <bytes>\n", argv[0]);
+		return 1;
+	}
+
+	bytes = strtoul(argv[2], NULL, 10);
+	if (!bytes) {
+		printf("No bytes!\n");
+		return 1;
+	}
+	if (bytes % 2) {
+		printf("Need an even number of bytes!\n");
+		return 1;
+	}
+	lbytes = 3*bytes/2;
+
+	str = malloc(bytes+1);
+	if (!str) {
+		printf("No enough memory for %lu bytes.\n", bytes);
+		return 1;
+	}
+	str2 = malloc(lbytes+1);
+	if (!str) {
+		printf("No enough memory for %lu bytes.\n", lbytes);
+		return 1;
+	}
+	readbuf = malloc(bytes*2);
+	if (!str) {
+		printf("No enough memory for %lu bytes.\n", bytes*2);
+		return 1;
+	}
+
+	for(i=0; i < bytes; i++)
+		str[i] = 'a' + (i % 26);
+	str[i] = '\0';
+
+	memcpy(str2, str, bytes);
+	memcpy(str2+(bytes/2), str, bytes);
+	str2[lbytes] = '\0';
+
+	printf("First  String: %s\nSecond String: %s\n", str, str2);
+
+	fd = open(argv[1], O_CREAT|O_RDWR|O_TRUNC, 0700);
+	if (fd == -1) {
+		printf("Could not open file %s.\n", argv[1]);
+		return 1;
+	}
+
+	rc = write(fd, str, bytes);
+	if (rc != bytes) {
+		printf("Write failed!\n");
+		return 1;
+	}
+
+	sleep(1);
+	rc = fstat(fd, &st);
+	if (rc < 0 || st.st_size != bytes) {
+		printf("bad file %lu size first write %lu != %lu: rc %d\n",
+		       st.st_ino, st.st_size, bytes, rc);
+		return 1;
+	}
+
+	rc = lseek(fd, bytes / 2, SEEK_SET);
+	if (rc != bytes / 2) {
+		printf("Seek failed!\n");
+		return 1;
+	}
+
+	rc = write(fd, str, bytes);
+	if (rc != bytes) {
+		printf("Write failed!\n");
+		return 1;
+	}
+
+	rc = fstat(fd, &st);
+	if (rc < 0 || st.st_size != bytes + bytes / 2) {
+		printf("bad file %lu size second write %lu != %lu: rc %d\n",
+		       st.st_ino, st.st_size, bytes, rc);
+		return 1;
+	}
+
+	rc = lseek(fd, 0, SEEK_SET);
+	if (rc != 0) {
+		printf("Seek failed!\n");
+		return 1;
+	}
+
+	rc = read(fd, readbuf, bytes * 2);
+	if (rc != lbytes) {
+		printf("Read %d bytes instead of %lu.\n", rc, lbytes);
+		if (rc == -1)
+			perror("");
+		else
+			printf("%s\n%s\n", readbuf, str2);
+		rc = fstat(fd, &st);
+		if (rc < 0 || st.st_size != bytes + bytes / 2) {
+			printf("bad file size after read %lu != %lu: rc %d\n",
+			       st.st_size, bytes + bytes / 2, rc);
+			return 1;
+		}
+
+		return 1;
+	}
+
+	fd = close(fd);
+	if (fd == -1)
+		return 1;
+
+	printf("%s\n%s\n", readbuf, str2);
+	if (strcmp(readbuf, str2)) {
+		printf("No match!\n");
+		return 1;
+	}
+
+	printf("Pass!\n");
+	return 0;
+}
-- 
1.8.3.1