
http://www.usenix.org/events/fast05/wips/slides/welch.pdf



-- STATLITE
  statlite(const char *filename, struct statlite *buf);
  fstatlite(int fd, struct statlite *buf);
  lstatlite(const char *filename, struct statlite *buf);

  * file size, mtime are optionally not guaranteed to be correct
  * mask field to specify which fields you need to be correct


-- READDIR+

  struct dirent_plus *readdirplus(DIR *dirp);
  int readdirplus_r(DIR *dirp, struct dirent_plus *entry, struct dirent_plus **result);
  struct dirent_lite *readdirlite(DIR *dirp);
  int readdirlite_r(DIR *dirp, struct dirent_lite *entry, struct dirent_lite **result);

  * plus returns lstat
  * lite returns lstatlite


-- lazy i/o integrity

  O_LAZY to open(2)

  * relax data coherency
  * writes may not be visible until lazyio_propagate, fsync, close

  lazyio_propagate(int fd, off_t offset, size_t count);
   * my writes are safe

  lazyio_synchronize(int fd, off_t offset, size_t count);
   * i will see everyone else's propagated writes

-- read/write non-serial vectors

  ssize_t readx(int fd, const struct iovec *iov, size_t iov_count, struct xtvec *xtv, size_t xtv_count);
  ssize_t writex(int fd, const struct iovec *iov, size_t iov_count, struct xtvec *xtv, size_t xtv_count);

 * like readv/writev, but serial
 * 


int lockg(int fd, int cmd, lgid_t *lgid)
   group locks

int openg(char *path, int mode, fh_t *handle);
   portable file handle
int sutoc(fh_t *fh);