Re: [OFFTOPIC] f_pos ?

[FabF <fabian.frederick@skynet.be>]

On Tue, 2004-07-06 at 21:58, Maneesh Soni wrote:
> On Sun, Jul 04, 2004 at 07:31:29PM +0000, FabF wrote:
> > Hi,
> > 	
> > 	I try to understand how readdir process works and I can't understand
> > f_pos management :
> > 
> >         Having in mind things work that way :
> > 
> >         user : ls
> >         glibc : 
> >                 open (->sys_open)
> >                 getdentries64 (->sys_getdentries64)
> >                 
> >         kernel:
> >                 sys_getdentries64
> >                 ->vfs_readdir
> >                         ->ext2_readdir
> > 
> > At that point, I don't understand why ext2_readdir is playing with
> > filp->f_pos .... It should be 0 ...Why does it care about offset ?
> > 
> 
> I think it may not be 0 all the time. A seekdir() could change could change
> the offset to non-zero.
> 
btw, someone could tell why old ext2 readdir had "do the readahead"
feature ; current ext3 as well but new ext2 implementation doesn't ???

Regards,
FabF

> Thanks
> Maneesh