making fs drivers ignore already open files during kernel setup and when opening init for the first time

src/kernel/drive.c

@@ -6,6 +6,8 @@
 uint8_t n_drives;
 struct drive drives[256];
 
+bool ignore_already_open = false;
+
 void init_drives() {
   n_drives = 0;
 }

src/kernel/drive.h

@@ -49,4 +49,6 @@ extern struct drive drives[MAX_DRIVES];
 void init_drives();
 void commit_drive(struct drive data);
 
+extern bool ignore_already_open;
+
 #endif

src/kernel/fat.c

@@ -238,7 +238,7 @@ static file_id_t fat_get_file(const struct drive *d, const char *path) {
         return 0;
       }
 
-      if (cur_dir->extra_attrib & FEA_OPEN_EXCLUSIVE) {
+      if (!ignore_already_open && (cur_dir->extra_attrib & FEA_OPEN_EXCLUSIVE)) {
         d->done(d);
         return 0;//maybe have a special return value for this?
       }

src/kernel/main.c

@@ -38,6 +38,8 @@ void main() {
   init_ide();
   //other drive drivers
 
+  ignore_already_open = true;
+
   init_log();
   init_settings();
 
@@ -94,6 +96,8 @@ void main() {
   if (!try_elf_run(drives, "bin/init", "", 0))
     PANIC("Failed to load init program.");
 
+  ignore_already_open = false;
+
   logf(LOG_INFO, "Switching to init task.");
 
   _start_user_mode();