1 files changed, 189 insertions, 0 deletions
diff --git a/user/bcachetest.c b/user/bcachetest.c
new file mode 100644
index 0000000..5dc46ef
--- /dev/null
+++ b/user/bcachetest.c
@@ -0,0 +1,189 @@
+#include "kernel/fcntl.h"
+#include "kernel/param.h"
+#include "kernel/types.h"
+#include "kernel/stat.h"
+#include "kernel/riscv.h"
+#include "kernel/fs.h"
+#include "user/user.h"
+
+void test0();
+void test1();
+
+#define SZ 4096
+char buf[SZ];
+
+int
+main(int argc, char *argv[])
+{
+  test0();
+  test1();
+  exit(0);
+}
+
+void
+createfile(char *file, int nblock)
+{
+  int fd;
+  char buf[BSIZE];
+  int i;
+  
+  fd = open(file, O_CREATE | O_RDWR);
+  if(fd < 0){
+    printf("createfile %s failed\n", file);
+    exit(-1);
+  }
+  for(i = 0; i < nblock; i++) {
+    if(write(fd, buf, sizeof(buf)) != sizeof(buf)) {
+      printf("write %s failed\n", file);
+      exit(-1);
+    }
+  }
+  close(fd);
+}
+
+void
+readfile(char *file, int nbytes, int inc)
+{
+  char buf[BSIZE];
+  int fd;
+  int i;
+
+  if(inc > BSIZE) {
+    printf("readfile: inc too large\n");
+    exit(-1);
+  }
+  if ((fd = open(file, O_RDONLY)) < 0) {
+    printf("readfile open %s failed\n", file);
+    exit(-1);
+  }
+  for (i = 0; i < nbytes; i += inc) {
+    if(read(fd, buf, inc) != inc) {
+      printf("read %s failed for block %d (%d)\n", file, i, nbytes);
+      exit(-1);
+    }
+  }
+  close(fd);
+}
+
+int ntas(int print)
+{
+  int n;
+  char *c;
+
+  if (statistics(buf, SZ) <= 0) {
+    fprintf(2, "ntas: no stats\n");
+  }
+  c = strchr(buf, '=');
+  n = atoi(c+2);
+  if(print)
+    printf("%s", buf);
+  return n;
+}
+
+// Test reading small files concurrently
+void
+test0()
+{
+  char file[2];
+  char dir[2];
+  enum { N = 10, NCHILD = 3 };
+  int m, n;
+
+  dir[0] = '0';
+  dir[1] = '\0';
+  file[0] = 'F';
+  file[1] = '\0';
+
+  printf("start test0\n");
+  for(int i = 0; i < NCHILD; i++){
+    dir[0] = '0' + i;
+    mkdir(dir);
+    if (chdir(dir) < 0) {
+      printf("chdir failed\n");
+      exit(1);
+    }
+    unlink(file);
+    createfile(file, N);
+    if (chdir("..") < 0) {
+      printf("chdir failed\n");
+      exit(1);
+    }
+  }
+  m = ntas(0);
+  for(int i = 0; i < NCHILD; i++){
+    dir[0] = '0' + i;
+    int pid = fork();
+    if(pid < 0){
+      printf("fork failed");
+      exit(-1);
+    }
+    if(pid == 0){
+      if (chdir(dir) < 0) {
+        printf("chdir failed\n");
+        exit(1);
+      }
+
+      readfile(file, N*BSIZE, 1);
+
+      exit(0);
+    }
+  }
+
+  for(int i = 0; i < NCHILD; i++){
+    wait(0);
+  }
+  printf("test0 results:\n");
+  n = ntas(1);
+  if (n-m < 500)
+    printf("test0: OK\n");
+  else
+    printf("test0: FAIL\n");
+}
+
+// Test bcache evictions by reading a large file concurrently
+void test1()
+{
+  char file[3];
+  enum { N = 200, BIG=100, NCHILD=2 };
+  
+  printf("start test1\n");
+  file[0] = 'B';
+  file[2] = '\0';
+  for(int i = 0; i < NCHILD; i++){
+    file[1] = '0' + i;
+    unlink(file);
+    if (i == 0) {
+      createfile(file, BIG);
+    } else {
+      createfile(file, 1);
+    }
+  }
+  for(int i = 0; i < NCHILD; i++){
+    file[1] = '0' + i;
+    int pid = fork();
+    if(pid < 0){
+      printf("fork failed");
+      exit(-1);
+    }
+    if(pid == 0){
+      if (i==0) {
+        for (i = 0; i < N; i++) {
+          readfile(file, BIG*BSIZE, BSIZE);
+        }
+        unlink(file);
+        exit(0);
+      } else {
+        for (i = 0; i < N*20; i++) {
+          readfile(file, 1, BSIZE);
+        }
+        unlink(file);
+      }
+      exit(0);
+    }
+  }
+
+  for(int i = 0; i < NCHILD; i++){
+    wait(0);
+  }
+  printf("test1 OK\n");
+}