CS3871/assignments/filesystem: Initial commit

4 files changed, 150 insertions, 0 deletions

diff --git a/filesystem/README.rst b/filesystem/README.rst
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/filesystem/README.rst
diff --git a/filesystem/disk.h b/filesystem/disk.h
new file mode 100644
index 0000000..7bf6ad0
--- /dev/null
+++ b/filesystem/disk.h
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define TRACKS 128
+#define SECTORS 4096
+
+/* 10ms per track change */
+/* 10ms/SECTORS per unit sector distance > 1 */
+
+void dinit();
+
+void rsector(int t,int s,unsigned char *b);
+
+void wsector(int t,int s,unsigned char *b);
+
+
diff --git a/filesystem/disk.o b/filesystem/disk.o
new file mode 100644
index 0000000..b1a36f8
--- /dev/null
+++ b/filesystem/disk.o
diff --git a/filesystem/tfs.c b/filesystem/tfs.c
new file mode 100644
index 0000000..2d4bdfd
--- /dev/null
+++ b/filesystem/tfs.c
@@ -0,0 +1,133 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "disk.h"
+
+#define MAX_INODES 10
+
+struct block_ptr {
+	char track;
+	short sector; 
+};
+
+struct meta_data{ 
+	char name[8];
+	int size;
+	int read;
+	int write;
+	int create;
+ };
+
+struct inode {
+	struct meta_data info;
+	struct block_ptr data[20];
+};
+
+typedef struct filestuff{
+	int fd;
+	struct inode file;
+};
+
+
+struct inode i_table[MAX_INODES];
+
+char bitmap[128][4096/8];
+
+int check_bitmap(t,s)
+int t,s;
+{
+	char tmp;
+	tmp = bitmap[t][s/8];
+	tmp &= (1 << (7-(s % 8)));
+	return (int) tmp;
+}
+
+void set_bitmap(t,s)
+int t,s;
+{
+	bitmap[t][s/8] |= (1 << (7-(s % 8)));
+}
+
+void print_bitmap()
+{
+	int i,j;
+	for(i = 0; i < 4096; i++) {
+		printf("\n%4d  ", i);
+		for (j = 0; j < 128; j++) {
+			printf("%02x", bitmap[j][i]);
+			if (j == 63) {
+				printf("\n%4d  ",i);
+			}
+		}
+	}
+}
+
+int search_inodes(name)
+char *name;
+{
+
+}
+
+/*
+int tfs_init()
+{
+	int n = MAX_INODES / 4;
+	int i;
+	char *ptr;
+	if (MAX_INODES % 4 > 0)
+		n++;
+
+	char buf[512 * n];
+
+	for (i =0; i < n; i++) {
+		rsector(0, i, &buf + (512 * i));
+	}
+	ptr = &buf;
+
+	for(i=0; i< MAX_INODES; i++) {
+		memcpy(&i_table[i], ptr, 64);
+		ptr + 64;
+	}
+}
+*/
+
+int open(fname, mode)
+char *fname, *mode;
+{
+	
+}
+
+int close(fd)
+int fd;
+{
+	
+}
+
+int read(fd, buf)
+int fd;
+char *buf;
+{
+	
+}
+
+int write(fd, buf)
+int fd;
+char *buf;
+{
+	
+}
+
+int ulink(fname)
+char *fname;
+{
+	
+}
+
+int main() 
+{
+	setBitmap(1,1);
+	setBitmap(2,2);
+
+	printf("test 1,1: %d,  test 2,2: %d\n", checkBitmap(1,1), checkBitmap(2,2));
+	printBitmap();
+}