aboutsummaryrefslogtreecommitdiff
path: root/filesystem
diff options
context:
space:
mode:
Diffstat (limited to 'filesystem')
-rw-r--r--filesystem/README.rst0
-rw-r--r--filesystem/disk.h17
-rw-r--r--filesystem/disk.obin3352 -> 0 bytes
-rw-r--r--filesystem/tfs.c352
4 files changed, 0 insertions, 369 deletions
diff --git a/filesystem/README.rst b/filesystem/README.rst
deleted file mode 100644
index e69de29..0000000
--- a/filesystem/README.rst
+++ /dev/null
diff --git a/filesystem/disk.h b/filesystem/disk.h
deleted file mode 100644
index 7bf6ad0..0000000
--- a/filesystem/disk.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#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
deleted file mode 100644
index b1a36f8..0000000
--- a/filesystem/disk.o
+++ /dev/null
Binary files differ
diff --git a/filesystem/tfs.c b/filesystem/tfs.c
deleted file mode 100644
index fe2d94c..0000000
--- a/filesystem/tfs.c
+++ /dev/null
@@ -1,352 +0,0 @@
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/time.h>
-#include "disk.h"
-
-#define MAX_INODES 1000
-#define INODE_START (TRACKS * SECTORS) / (8 * 512)
-#define MAX_FILES 50
-
-struct block_ptr {
- char track;
- short sector;
-};
-struct blockll{
- struct block_ptr data;
- struct blockll *next;
-};
-
-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];
-};
-
-
-struct inode_list{
- struct inode *node;
- struct inode_list *next;
-};
-
-struct file {
- struct inode *node;
- int mode;
- int next_sec;
- int free;
-};
-
-
-int inode_list_size = 0;
-struct inode_list *root, *end;
-
-char bitmap[TRACKS][SECTORS/8];
-
-struct file files[MAX_FILES];
-int size;
-
-
-
-int check_bitmap(t,s)
-int t,s;
-{
- char tmp;
- tmp = bitmap[t][s/8];
- tmp &= (1 << (s % 8));
- return (int) tmp;
-}
-
-void set_bitmap(t,s)
-int t,s;
-{
- bitmap[t][s/8] |= (1 << (s % 8));
- return;
-}
-
-void print_bitmap()
-{
- int i,j;
- for(i = 0; i < 128; i++){
-
- printf("\n%4d ", i);
- for (j = 0; j < 4096/8; j++) {
- printf("%02x", bitmap[i][j]);
- if (j %31 == 0) {
- printf("\n%4d ",i);
- }
- }
- }
-}
-
-
-/* TODO
- * Implement inode table as binary tree to speedup searches
- */
-struct inode* inode_search(name)
-char *name;
-{
- if (strcmp(name,"") == 0) {
- return -1;
- }
- int i;
- struct inode_list *tmp = root;
-
- for(i = 0; i < MAX_INODES && i < inode_list_size; i++){
- tmp = tmp->next;
- if(strcmp(name, tmp->node->info.name) == 0)
- return tmp->node;
- }
- return -2;
-}
-
-struct blockll* get_blocks(size)
-int size;
-{
- int i, t, s;
- struct blockll *root, *current = malloc(sizeof(struct blockll));
- root = current;
-
- for (i = 0; size > 0 && i < (4096 * 128); i++) {
- t = i / 4096;
- s = i % 4096;
-
- if (!check_bitmap(t, s)) {
- current->next = malloc(sizeof(struct blockll));
- current = current->next;
- current-> next = NULL;
- current->data.track = (char) t;
- current->data.sector = (short) s;
-
- set_bitmap(t,s);
- size-= 512;
- }
- }
-
- return i <(4096 * 128) ? root : NULL;
-}
-
-struct inode_list* inode_create(name)
-char *name;
-{
- struct timeval *tmp_time = malloc(sizeof(struct timeval));
-
- struct inode_list *tmp = malloc(sizeof(struct inode_list));
- struct inode *tmp_node = malloc(sizeof(struct inode));
-
-
- tmp->node = tmp_node;
-
- memcpy(&(tmp->node->info.name), name, strlen(name));
-
- gettimeofday(tmp_time, NULL);
-
- tmp->node->info.create = tmp_time->tv_sec;
- tmp->node->info.read = tmp_time->tv_sec;
- tmp->node->info.write = tmp_time->tv_sec;
-
- end->next = tmp;
- end = tmp;
- inode_list_size++;
-
- return tmp;
-}
-
-int inode_init()
-{
- int n = MAX_INODES / 4;
- int i;
- char *ptr;
- struct inode_list *tmp;
-
- if (MAX_INODES % 4 > 0)
- n++;
-
- char *buf = malloc(512 * n);
-
- for (i =0; i < n; i++) {
- rsector(0, i, buf + (512 * i));
- }
- ptr = buf;
-
- tmp = root;
-
- for(i=0; i< MAX_INODES; i++) {
- tmp->next = malloc(sizeof(struct inode_list));
- memcpy(&tmp->node, ptr, 64);
- ptr += 64;
- tmp = tmp->next;
- inode_list_size++;
- }
-}
-
-/*save inodes to first n sectors on disk*/
-void inode_save()
-{
- int i, j;
- char *buf = malloc(512);
- struct inode_list *tmp = root;
-
- for (i = 0; i < MAX_INODES && tmp->next;i++) {
- for (j = 0; j < 4; j++){
- tmp = tmp->next;
- memcpy(buf + j, tmp->node, sizeof(struct inode));
- }
- wsector(0, INODE_START + i, buf);
- }
-}
-
-struct inode* inode_from_fd(fd)
-int fd;
-{
- int i;
- struct inode_list *tmp = root;
-
- for (i = 0; i < fd; i++) {
- tmp = tmp->next;
- }
-
- return tmp->node;
-}
-
-int find_fd()
-{
- int i;
- for (i = 0; i < size; i++) {
- if (files[i].free)
- return i;
- }
-}
-
-int tfs_init()
-{
- int i;
- root = malloc(sizeof(struct inode_list));
- end = root;
-
- dinit();
- /*
- *
- * has issue if inodes have not been written to disk i.e. first run
- inode_init();
- */
- for (i = 0; i < MAX_FILES; i++) {
- files[i].free = 1;
- }
-}
-
-
-int open(fname, mode)
-char *fname, *mode;
-{
- struct inode *fnode = inode_search(fname);
- int fd;
-
- if (fnode == -1)
- return -1;
-
- if (fnode == -2){
- fnode = inode_create(fname)->node;
- }
- fd = find_fd();
-
- files[fd].node = fnode;
- files[fd].mode = *mode;
- files[fd].next_sec = 0;
- files[fd].free = 0;
- size++;
-
- return fd;
-}
-
-int close(fd)
-int fd;
-{
- if (files[fd].free)
- return -1;
-
- files[fd].free = 1;
- return 1;
-}
-
-int read(fd, buf)
-int fd;
-char *buf;
-{
- if (files[fd].free || files[fd].mode || (files[fd].next_sec == 20))
- return -1;
-
-
- rsector(files[fd].node->data[files[fd].next_sec].track, files[fd].node->data[files[fd].next_sec].sector, buf);
- files[fd].next_sec++;
- return 512;
-}
-
-int write(fd, buf)
-int fd;
-char *buf;
-{
- if ((files[fd].next_sec == 20) || !files[fd].mode)
- return 0;
-
- struct blockll *tmp = get_blocks(500);
- files[fd].node->data[files[fd].next_sec].track = tmp->data.track;
- files[fd].node->data[files[fd].next_sec].sector = tmp->data.sector;
-
- wsector(files[fd].node->data[files[fd].next_sec].track, files[fd].node->data[files[fd].next_sec].sector, buf);
- return 1;
-}
-
-int ulink(fname)
-char *fname;
-{
- struct inode_list *tmp = root;
- struct inode *d;
- int i;
-
- for(i = 0; i < MAX_INODES && i < inode_list_size; i++){
- tmp = tmp->next;
- if(strcmp(fname, tmp->next->node->info.name) == 0)
- break;;
- }
-
- d = tmp->next->node;
- tmp->next = tmp->next->next;
- free(d);
- return 1;
- }
-
-int main()
-{
- tfs_init();
-
- /*
- *Test Writing
- */
- int mode = 1;
- int fd = open("test", &mode);
-
- char buf[512];
- memcpy(&buf, "Hello Filesystem", strlen("Hello Filesystem"));
-
- int test = write(fd, &buf);
- close(fd);
-
- /*
- *Test reading
- */
- mode = 0;
- fd = open("test", &mode);
- char buf2[512];
- read(fd, &buf2);
- printf("wrote: %s\n", buf);
-
- printf("read: %s\n", buf2);
-
-}
generated by cgit v1.1 at 2024-12-23 03:52:48 +0000