Re: Perfomance problem backupscript (more details and tests)

Hi,

> > Any reasonably recent version of 32-bit Linux has sizeof(ino_t)==8.  You
> > have to define _LARGEFILE64_SOURCE to be able to see it, but that is the
> > same thing you need for 'open' and 'lstat' to work with large files anyway.
> 
> Are you sure that you don't confuse it with off_t?

For getting 64 bit off_t i compile with
  -D_FILE_OFFSET_BITS=64
This also replaces the 32 bit versions of the off_t
using functions by 64 bit versions.

Together with
  -D_LARGEFILE_SOURCE
i seem to get a fully 64 bit filesystem API (at least
it could cope with a 5 GB file on ReiserFS).
I should test wether i can omit _LARGEFILE_SOURCE if
_FILE_OFFSET_BITS=64 is set.

_LARGEFILE64_SOURCE indeed enables ino64_t plus
64-bit API functions, but it is specified not to make
ino_t and ino64_t synonymous. It is described as
"transition interface". So you have to call functions
like stat64() in order to get returned struct stat64.

_LARGEFILE_SOURCE allows the use of functions which
use off_t rather than long for byte addressing purposes.


It is said that the macros are described in  info libc
but i am not masochist enough to find out why my  info
only shows me its top level table of contents then.
Found by google:
  http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
I once got my inspirations from :
  http://www.suse.de/~aj/linux_lfs.html
which advises to define all three macros.


Have a nice day :)

Thomas