missing get_empty_inode()

missing get_empty_inode()

[Ralf Oehler]

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Hello, list

Currently I'm porting my driver sources from 2.4.18 to 2.4.20 an I noticed
the absence of get_empty_inode().
I didn't find an exported function to get a sb-less inode.
My goal is to open sd- and an sg- devices in order to do
ioctl(send_scsi_cmd) on them. As my driver acts as a block device driver
(layered pseudo block device), there is no sb assigned to it.

What is, according to the current philosophy, the cleanest code-sniplet to

- open
- ioctl
- close

an sd-device ?
an sg-device ?

Currently (2.4.18), I do it like



open-sd:
        dummy_inode = get_empty_inode();
        init_special_inode( dummy_inode, 
                            S_IFBLK | 0600,
                            kdev );
        dummy_inode->i_bdev = bdev;
        dummy_inode->i_dev = dummy_inode->i_rdev;
        insert_inode_hash(dummy_inode);

close-sd:
        def_blk_fops.release(dummy_inode, &dummy_filp);

ioctl-sd:
        ioctl_by_bdev(dummy_inode->i_bdev, cmd, arg);




open-sg:
  dummy_inode = get_empty_inode();
  init_special_inode( dummy_inode, 
                      S_IFCHR | 0600,
                      kdev );
  dummy_inode->i_dev = dummy_inode->i_rdev;
  dummy_dentry.d_inode = dummy_inode;
  ret = init_private_file( dummy_file,
                           dummy_dentry,
                           FMODE_READ|FMODE_WRITE );    /* calls open() */
  insert_inode_hash(dummy_inode);

close-sg:
  dummy_file->f_op->release(dummy_inode, dummy_file);
  fops_put(filp->f_op);
  filp->f_dentry = NULL;
  dummy_inode->i_state |= I_FREEING;
  clear_inode(dummy_inode);
  dummy_inode = NULL;

ioctl-sg:
        filp->f_op->ioctl( dummy_inode, filp, cmd, arg );





Regards,
        Ralf


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Re: missing get_empty_inode()

[Christoph Hellwig]

On Fri, May 09, 2003 at 11:27:03AM +0200, Ralf Oehler wrote:
> Hello, list
> 
> Currently I'm porting my driver sources from 2.4.18 to 2.4.20 an I noticed
> the absence of get_empty_inode().
> I didn't find an exported function to get a sb-less inode.

There is none.  Inodes must have superblocks associated to them.

> My goal is to open sd- and an sg- devices in order to do
> ioctl(send_scsi_cmd) on them. As my driver acts as a block device driver
> (layered pseudo block device), there is no sb assigned to it.
> 
> What is, according to the current philosophy, the cleanest code-sniplet to
> 
> - open
> - ioctl
> - close
> 
> an sd-device ?
> an sg-device ?

open it from userspace.