Truncate works, big rewrite how to handle and save modified data to disk

lsfs_disk_controller.h

@@ -37,11 +37,12 @@ int get_free_sectors(int num_sectors_needed, lsfs_sector_offset* output_array);
 int lsfs_disk_read_data_from_file(lsfs_file* file, int buffer_size, void* buffer_for_data);
 int lsfs_disk_write_data_to_file(lsfs_file* file, int data_length, char *data);
 //int lsfs_disk_rename_tag(lsfs_file_id file_id, char* new_filename);
-int lsfs_disk_rename_file(lsfs_file_id file_id, const char* new_filename);
+int lsfs_disk_rename_file(lsfs_file* file, const char* new_filename);
 int lsfs_disk_load_disk();
 int write_data_to_disk(lsfs_sector_offset at_sector, uint32_t file_block_size, void* data_to_write);
-int read_data_from_disk(lsfs_sector_offset index, void* data_buffer);
+int read_data_from_disk(lsfs_sector_offset index, uint32_t file_block_size, void* data_buffer);
 int write_data_to_disk_off(lsfs_sector_offset index, void* data_to_write, int offset);
+int save_modified_file_information(lsfs_file* file);
 
 
 #define SECTOR_SIZE 512
@@ -118,12 +119,14 @@ typedef struct tag_record {
 
 typedef struct lsfs_file {
     lsfs_file_id file_id;
+    lsfs_sector_offset table_entry_pointer;
     char* filename;
     uint32_t owner_id;
     uint64_t size;
     uint64_t creation_date; 
     uint64_t access_time;
     uint64_t modification_time;
+    uint32_t file_block_size;
     lsfs_sector_offset *data;
 } lsfs_file;
 
@@ -136,8 +139,8 @@ int lsfs_disk_getattr(lsfs_file* find_file, const char* path) {
             time_t current_time;
             time ( &current_time );
 
-            //find_file = calloc(1, sizeof(lsfs_file));
             find_file->file_id = p_control.master_table[i].file_id;
+            find_file->table_entry_pointer = i;
             find_file->filename = p_control.master_table[i].filename;
             find_file->owner_id = getuid();
             find_file->size = p_control.master_table[i].file_size; // p_control.master_table[i].data_pointer[0]; //;
@@ -145,6 +148,7 @@ int lsfs_disk_getattr(lsfs_file* find_file, const char* path) {
             find_file->access_time = (uint64_t) current_time;
             find_file->modification_time = (uint64_t) current_time;
             find_file->data = p_control.master_table[i].data_pointer;
+            find_file->file_block_size = 1; // TODO: should be loaded from disk.
             found = 1;
         }
         i++;
@@ -163,7 +167,7 @@ int lsfs_disk_read_data_from_file(lsfs_file *file, int buffer_size, void* buffer
         if(file->data[i] == 0) {
             break;
         }
-        return_val += read_data_from_disk(file->data[i], buffer_for_data + (SECTOR_SIZE * i));
+        return_val += read_data_from_disk(file->data[i], file->file_block_size, buffer_for_data + (SECTOR_SIZE * i));
     }
 
     //time_t current_time;
@@ -182,15 +186,16 @@ static inline time_t lsfs_disk_update_timestamps(lsfs_file *file) {
 #define lsfs_num_sectors_for_size(x) (((x)+SECTOR_SIZE-1)&~(SECTOR_SIZE-1))
 
 int lsfs_disk_write_data_to_file(lsfs_file *file, int data_length, char *data) {
+    int written;
     int amount_written = data_length;
 
     lsfs_sector_offset current_sector = file->size / SECTOR_SIZE;
     unsigned int offset_in_sector = file->size % SECTOR_SIZE;
 
-    char *tmp_buffer = malloc(SECTOR_SIZE);
+    char *tmp_buffer = calloc(file->file_block_size, SECTOR_SIZE);
     assert(tmp_buffer);
 
-    read_data_from_disk(file->data[current_sector], tmp_buffer);
+    read_data_from_disk(file->data[current_sector], file->file_block_size, tmp_buffer); 
 
     memcpy(tmp_buffer + offset_in_sector, data, SECTOR_SIZE-offset_in_sector);
     data_length -= SECTOR_SIZE-offset_in_sector;
@@ -201,7 +206,7 @@ int lsfs_disk_write_data_to_file(lsfs_file *file, int data_length, char *data) {
 
     for (;;) {
         assert(current_sector <= NUM_DATA_POINTERS);
-        write_data_to_disk(p_control.master_table[file->file_id].data_pointer[current_sector], 4, tmp_buffer);
+        written = written + write_data_to_disk(p_control.master_table[file->file_id].data_pointer[current_sector], 4, tmp_buffer);
         if (data_length <= 0) break;
 
         data += SECTOR_SIZE;
@@ -221,9 +226,9 @@ int lsfs_disk_write_data_to_file(lsfs_file *file, int data_length, char *data) {
     free(tmp_buffer);
     
     //lsfs_disk_update_timestamps(&mif_record);
-    p_control.master_table[file->file_id].file_size += amount_written; // update file size
+    file->size += amount_written; // update file size
-
+    save_modified_file_information(file);
-    write_data_to_disk(file->file_id, 4, &p_control.master_table[file->file_id]);
+    //write_data_to_disk(file->file_id, 4, &p_control.master_table[file->file_id]);
     return amount_written;
 }
 
@@ -235,7 +240,8 @@ time_t lsfs_disk_truncate_file(lsfs_file *file, off_t offset) {
 
     file->size = (int) offset; // p_control.master_table[i].data_pointer[0]; //;
 
-    write_data_to_disk(file->file_id, 4, NULL);
+    save_modified_file_information(file);
+    //write_data_to_disk(file->file_id, 4, NULL);
     return result;
 }
 
@@ -256,27 +262,25 @@ time_t lsfs_disk_truncate_file(lsfs_file *file, off_t offset) {
 //     return 1;
 // }
 
-int lsfs_disk_rename_file(lsfs_file_id file_id, const char* new_filename) {
+int lsfs_disk_rename_file(lsfs_file* file, const char* new_filename) {
-    mif* mif_record = calloc(1, SECTOR_SIZE);
-    read_data_from_disk(file_id, mif_record);
 
-    memset(mif_record->filename, 0, sizeof(mif_record->filename));
+    memset(file->filename, 0, 256);
-    sprintf(mif_record->filename, "%s", new_filename); 
+    sprintf(file->filename, "%s", new_filename); 
 
     time_t current_time;
     time ( &current_time );
 
-    mif_record->last_modification_data = (uint64_t) current_time;
+    file->access_time = (uint64_t) current_time;
-    mif_record->last_access_date = (uint64_t) current_time;
+    file->modification_time = (uint64_t) current_time;
+
+    save_modified_file_information(file);
 
-    write_data_to_disk(file_id, 4, mif_record);
-    free(mif_record);
     return 1;
 }
 
 int lsfs_disk_delete_file(lsfs_file_id file_id) {
     mif* mif_record = calloc(1, SECTOR_SIZE);
-    read_data_from_disk(file_id, mif_record);
+    read_data_from_disk(file_id, 1, mif_record);
 
     for (int i = 0; i < MAX_TAGS_FOR_A_FILE; ++i)
     {
@@ -582,6 +586,19 @@ lsfs_file_id lsfs_disk_create_file(char* filename, lsfs_file_id* tags, void* fil
     return return_id;
 }
 
+int save_modified_file_information(lsfs_file* file) {
+    // Write the file struct into the table_entry, such that we can save the data correct. 
+    
+    p_control.master_table[file->table_entry_pointer].file_id = file->file_id;
+    memcpy(p_control.master_table[file->table_entry_pointer].filename, file->filename, 256);
+    p_control.master_table[file->table_entry_pointer].file_size = file->size; // p_control.master_table[i].data_pointer[0]; //;
+    //p_control.master_table[i].data_pointer = find_file->data;
+
+    write_data_to_disk(file->table_entry_pointer, file->file_block_size, &p_control.master_table[file->table_entry_pointer]);
+    return 0;
+}
+
+
 int write_data_to_disk(lsfs_sector_offset index, uint32_t file_block_size, void* data_to_write) {
     fseek ( disk, (index * SECTOR_SIZE), SEEK_SET ); // SEEK_SET start offset at index 0 and move 1 * SECTOR_SIZE, and write here.
     int written = fwrite(data_to_write, 1, (4 * SECTOR_SIZE), disk);
@@ -594,9 +611,9 @@ int write_data_to_disk_off(lsfs_sector_offset index, void* data_to_write, int of
     return written;
 }
 
-int read_data_from_disk(lsfs_sector_offset index, void* data_buffer) {
+int read_data_from_disk(lsfs_sector_offset index, uint32_t file_block_size, void* data_buffer) {
     fseek ( disk, (index * SECTOR_SIZE ), SEEK_SET ); // SEEK_SET start offset at index 0 and move 1 * SECTOR_SIZE, and write here.
-    int read = fread(data_buffer, 1, (4 * SECTOR_SIZE), disk);
+    int read = fread(data_buffer, 1, (file_block_size * SECTOR_SIZE), disk);
     return read;
 }
 

lsfs_fuse.c

@@ -199,9 +199,9 @@ int lsfs_write(const char *path, const char *content, size_t content_length, off
     
     res = lsfs_disk_write_data_to_file(((lsfs_file*) file_info->fh), content_length, (void*) content);
 
-    //((lsfs_file*) file_info->fh)->size += res;
+    ((lsfs_file*) file_info->fh)->size += res;
-    //((lsfs_file*) file_info->fh)->access_time = current_time;
+    ((lsfs_file*) file_info->fh)->access_time = current_time;
-    //((lsfs_file*) file_info->fh)->modification_time = current_time;
+    ((lsfs_file*) file_info->fh)->modification_time = current_time;
     return res;
 }