Re: libgdbm open & xfs problems

[Andrei Pelinescu-Onciul <pelinescu-onciul@xxxxxxxxxxxx>]

I think I've found the problem.
It's not an xfs bug, is a bug in libgdbm, gdbm_open:

dbf->header->dir_size = 8 * sizeof (off_t);
[...]

     while (dbf->header->dir_size < dbf->header->block_size)
        {
          dbf->header->dir_size <<= 1;
          dbf->header->dir_bits += 1;
        }

      /* Check for correct block_size. */
      if (dbf->header->dir_size != dbf->header->block_size)
        {
          gdbm_close (dbf);
          gdbm_errno = GDBM_BLOCK_SIZE_ERROR;
          return NULL;
        }

The initial dir_size is 8*4=32. dbf->header->block_size is the io block
size returned by fstat.
On my partition I use swidth=384 => block_size = 196608 = 3 * 65536.
But in the piece of code above dir_size can be only of the form 2^n
(dir_size<<=1), so in my case it will be always different from
block_size :(

I have to report this to libgdbm developers.


Andrei