adde disk read/write functions

kernel/fs/fs.c

@@ -57,3 +57,23 @@ struct file *fs_find_file_rel(struct file *rel, char *rel_path)
 
 	panic("fs_find_file_rel NOT YET IMPLEMENTED");
 }
+
+int disk_read(struct disk *disk, size_t offset, size_t len, uint8_t *buffer)
+{
+	(void) disk;
+	(void) offset;
+	(void) len;
+	(void) buffer;
+
+	panic("disk_read NOT YET IMPLEMENTED");
+}
+
+int disk_write(struct disk *disk, size_t offset, size_t len, uint8_t *buffer)
+{
+	(void) disk;
+	(void) offset;
+	(void) len;
+	(void) buffer;
+
+	panic("disk_write NOT YET IMPLEMENTED");
+}

kernel/include/comus/fs.h

@@ -28,6 +28,28 @@ struct disk {
 	/// we then need drivers for ide and/or sata, ide is easier
 };
 
+/**
+ * read data from a disk into a buffer
+ *
+ * @param disk - the disk to read from
+ * @param offset - the offset into the disk to read
+ * @param len - the length of the data to read into `buffer`
+ * @param buffer - the buffer to save data into
+ * @returns bytes read on success, negative fs error code in failure
+ */
+int disk_read(struct disk *disk, size_t offset, size_t len, uint8_t *buffer);
+
+/**
+ * write data from a disk into a buffer
+ *
+ * @param disk - the disk to write from
+ * @param offset - the offset into the disk to write
+ * @param len - the length of the data to write into `buffer`
+ * @param buffer - the buffer to read from
+ * @returns bytes written on success, negative fs error code in failure
+ */
+int disk_write(struct disk *disk, size_t offset, size_t len, uint8_t *buffer);
+
 enum file_type {
 	// regular file
 	F_REG = 0,