VFS can now reschedule the calling process

kernel/fs/fatfs_ctx.h

@@ -1,6 +1,9 @@
 #ifndef _KERNEL_FS_FATFS_CTX_H
 #define _KERNEL_FS_FATFS_CTX_H
 
+struct proc;
+struct reschedule_ctx;
+
 struct fatfs_ctx {
   FL_FILE _files[FATFS_MAX_OPEN_FILES];
   int _filelib_init;
@@ -9,6 +12,8 @@ struct fatfs_ctx {
   struct fat_list _open_file_list;
   struct fat_list _free_file_list;
   void* udata;
+  struct proc* proc;
+  struct reschedule_ctx* rctx;
 };
 
 #endif // _KERNEL_FS_FATFS_CTX_H