Method read

src/client/Client.cc:11349–11389

// blocking osd interface

int Client::read(int fd, char *buf, loff_t size, loff_t offset)
{
  RWRef_t mref_reader(mount_state, CLIENT_MOUNTING);
  if (!mref_reader.is_state_satisfied())
    return -ENOTCONN;

  tout(cct) << "read" << std::endl;
  tout(cct) << fd << std::endl;
  tout(cct) << size << std::endl;
  tout(cct) << offset << std::endl;

  std::unique_lock lock(client_lock);
  Fh *f = get_filehandle(fd);
  if (!f)
    return -EBADF;
#if defined(__linux__) && defined(O_PATH)
  if (f->flags & O_PATH)
    return -EBADF;
#endif
  bufferlist bl;
#if defined(__linux__)
  /* We can't return bytes written larger than INT_MAX, clamp size to
   * that or FSCRYPT_MAXIO_SIZE*/
  Inode *in = f->inode.get();
  if (in->is_fscrypt_enabled()) {
    size = std::min(size, (loff_t)FSCRYPT_MAXIO_SIZE);
  } else {
    size = std::min(size, (loff_t)INT_MAX);
  }
#else
  size = std::min(size, (loff_t)INT_MAX);
#endif
  int r = _read(f, offset, size, &bl);
  ldout(cct, 3) << "read(" << fd << ", " << (void*)buf << ", " << size << ", " << offset << ") = " << r << dendl;
  if (r >= 0) {
    lock.unlock();
    bl.begin().copy(bl.length(), buf);
    r = bl.length();
  }
  return r;
}

int Client::preadv(int fd, const struct iovec *iov, int iovcnt, loff_t offset)
{