VFS mount/umount + sys_open/close/read/fake write

include/fs/tar.h

@@ -9,6 +9,7 @@
 
 #include <stdint.h>
 #include <limine.h>
+#include <stddef.h>
 
 struct tar_header
 {
@@ -33,4 +34,9 @@ int tar_init_fs(struct limine_file* file);
 struct tar_header* tar_file_lookup(const char* filename);
 void tar_file_read(struct tar_header* header, uint8_t* buf);
 
+int tar_open(const char* path, int flags);
+int tar_close(int fd);
+int64_t tar_read(int fd, char* buf, size_t count);
+int64_t tar_write(int fd, char* buf, size_t count);
+
 #endif

include/fs/vfs.h

@@ -0,0 +1,50 @@
+/*
+ * @author  xamidev <xamidev@riseup.net>
+ * @brief   Virtual filesystem layer
+ * @license GPL-3.0-only
+ */
+
+/*
+ PepperOS will not work like the Unix-based mountpoint approach,
+ but rather like what Windows does. Filesystems will be separated
+ into "drives", and each drive will have a number assigned.
+ */
+
+#ifndef VFS_H
+#define VFS_H
+
+#include <limine.h>
+#include <stddef.h>
+#include <stdint.h>
+
+typedef enum
+{
+    DRIVE_TAR
+} DriveType;
+
+struct drive
+{
+    unsigned int id;
+    DriveType type;
+    struct fs_operations* operations;
+
+    struct drive* next;
+};
+
+struct fs_operations
+{
+    int (*open)(const char* path, int flags);
+    int (*close)(int fd);
+    int64_t (*read)(int fd, char* buf, size_t count);
+    int64_t (*write)(int fd, char* buf, size_t count);
+};
+
+int vfs_mount(struct limine_file* file, DriveType type);
+int vfs_umount(unsigned int drive_id);
+
+int vfs_open(const char* path, int flags);
+int vfs_close(int fd);
+int64_t vfs_read(int fd, char* buf, size_t count);
+int64_t vfs_write(int fd, const char* buf, size_t count);
+
+#endif