[PATCH] fallocate returned values on failure

[Jones]

Hello list,

There is samba-4.0.5 in the linux box,
and set strict allocate = yes to go through fallocate api.

Found if fallocate() returns -1 with errno = ENOSPC,
cannot catch by error handling as followings:
    ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_EXTEND_SIZE,
             offset, num_to_write);
  if (ret == ENOSPC) {
  errno = ENOSPC;
ret = -1;
        goto out;
  }

Per man pages said,
posix_fallocate() returns an error number on failure,
fallocate() returns -1 on failure.

Patch as attached could handle -1 returned from fallocate() on failure,
please help review and any suggestions are appreciated,
thanks.

--
Regards,
Jones
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