Function flushEntry

packages/computerd/src/fuse/driver.ts:365–388

(path: string)

  // Returns errno on failure so callers can surface it to the
  // kernel; returns 0 on success or when there's nothing to do.
  const flushEntry = (path: string): number => {
    const entry = files.get(path);
    if (entry === undefined || !entry.dirty) return 0;
    try {
      const data = entry.buf.subarray(0, entry.size);
      // Pass the cached mode so writeFile doesn't fall back to its
      // 0o644 default. Without this, a chmod between create/open and
      // flush would land on the FUSE-side meta override but never
      // reach the persisted VFS row, so RPC consumers would see the
      // wrong mode.
      const writeOpts = { mode: entry.mode & 0o7777 };
      if (rangedWriteVfs.writeFileRangesSync !== undefined && entry.dirtyRanges.length > 0) {
        rangedWriteVfs.writeFileRangesSync(toVfs(path), data, entry.dirtyRanges, writeOpts);
      } else {
        vfs.writeFileSync(toVfs(path), data, writeOpts);
      }
      entry.dirty = false;
      entry.dirtyRanges = [];
      entry.pendingCreate = false;
      return 0;
    } catch (error) {
      return toErrno(error);
    }
  };

  const truncatePath = (path: string, size: number, cb: StatusCallback): void => {
    if (!exists(path)) {