Re: getdents64 problem

[Trond Myklebust <trond dot myklebust at fys dot uio dot no>]

>>>>> " " == Jakub Jelinek <jakub@redhat.com> writes:

     > glibc expects just uniqueness and that you're able to lseek to
     > any of the d_off's unless it is -1LL, in which case next
     > getdents should read the next dirent entry. But d_off's are
     > visible to other programs, so other programs might do further
     > assumptions. On the other side, without monotonicity getdents
     > would end up with pretty weird behaviour (it would change
     > current file position up and down).

The problem here is that I cannot guarantee that the server won't
insert some new entry in between an existing entry and the next. I
have no idea as to the physical layout of the directory.

Uniqueness can easily be guaranteed (just by using a counter and
increasing it for each new cookie that I add to the dictionary).

Monotonicity cannot so easily be done, as I have to be able to deal
with insertion of new cookies without reassigning existing offsets.

Cheers,
  Trond