[Sorry if this is a dupe, dunno if unsubscribed ones can post]
Hi,
I'm trying to understand a bit struct block_device and friends.
I'm writing a piece of code which needs to hold a ref onto a bdev.
This piece of code works on hda or ram0, but oopses on fd0 or cdrom:
> static void piggyback(dev_t dev)
> {
> struct block_device *bdev;
> int err;
> bdev = bdget(dev);
> if(!bdev)
> {
> printk(KERN_ERR "no bdev ...\n");
> goto no_bdev;
> }
> err = blkdev_get(bdev, FMODE_READ, 0, BDEV_RAW);
> if(err)
> {
> printk(KERN_ERR "blkdev_get: error %d\n", -err);
> goto no_get;
> }
> printk(KERN_INFO "using device %s\n", bdev->bd_disk->disk_name);
> blkdev_put(bdev, BDEV_RAW);
> no_get:
> bdput(bdev);
> no_bdev:
> return;
> }
This function gets called inside proc_file_write. I'm using a 2.6.0
kernel. Any hint on what I get wrong ?
Thanks,
Xav
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