On Mon, Sep 16, 2002 at 05:36:43AM +0100, Dharmender Rai wrote: > a super block is related to one file system. linux > supports many. "x" super-blocks can be used to support > that "x" fs types. the info about the fs can be > extracted using the union. More exactly, info the specific filesystem driver uses internaly is stored there. Noone but the driver system should ever look there. > PS : union is being used to save space (also because > we need info abt 1 fs ) ;) > > --- VS <dojik@yahoo.com> wrote: > Hi, > > > > In the struct super_block in linux/fs.h > > there is a union which has the union u which points > > to > > the super_block_info of different file systems. > > Could > > someone tell me what this super_block_info is and > > what > > it is used for. Is there any particular format for > > the > > structure. Is there any documentation on this on the > > web. Also I think to add a filesystem I have to use > > the generic_spb pointer in this union. Any pointers > > are appreciated. It's data of filesystem driver. If you are writing a driver, put anything you need there. If not, don't ever thing of looking there. If you are adding a driver, you may either patch fs.h to include your struct as well, or use the generic pointer. > > Thanks, > > VS ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
