Re: [ECOS] Filesystem get/setinfo

[Nick Garnett <nickg@ecoscentric.com>]

Savin Zlobec <savin.zlobec@email.si> writes:

> On Mon, 20 Oct 2003 at 19:07:19, Nick Garnett wrote:
> 
> > Savin Zlobec <savin@elatec.si> writes:
> > 
> > > I need to write some filesystem specific functions.
> > > The get/setinfo calls seem to be the right way to do this,
> > > but I can't find any functions to access them from my application.
> > > 
> > > The following functions would do the trick for me:
> > > 
> > > int cyg_fs_getinfo(const char *path, int key, void *buf, int len);
> > > int cyg_fs_setinfo(const char *path, int key, void *buf, int len);
> > > int cyg_fs_fgetinfo(int fd, int key, void *buf, int len);
> > > int cyg_fs_fsetinfo(int fd, int key, void *buf. int len);
> > > 
> > > Or is there any way to do this already without accessing internal
> > > structures?
> > 
> > For filesystems you should be using ioctl() for these sorts of
> > out-of-band control operations. That's what it's there for, and more
> > than likely there is already a code defined for what you want to do.
> 
> I could work with ioctl, but if the desired operation is filesystem
> oriented (as opposed to file oriented), then I would need to open a
> file just to get a file descriptor for use with ioctl.
>  
> > What do you need these functions for?
> 
> Currently I need fs info like total/free/used sectors count,
> status flags (if it was cleanly unmounted and if there were any IO errors).
> Later I may need some sort of special access to reserved sectors... 

I see. Like mount()/umount() POSIX has not defined interface for these
sorts of things. Given that, then the functions you propose are
probably a worthwhile addition.

If you would like to submit a patch I'm sure that it will be accepted.


-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com      The eCos and RedBoot experts


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