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SubjectRe: Reading page from given block device


On Thu, 9 May 2002, Pavel Machek wrote:

> Hi!
>
> > > Well, I'm doing it during boot, and this is swap partition; it should
> > > not have been accessed previously.
> > >
> > > > > bdev = bdget(kdev_t_to_nr(dev));
> > > > > if (!bdev) {
> > > > > printk("No block device for %s\n", __bdevname(dev));
> > > > > BUG();
> > > > > }
> > > > > printk("C");
> >
> > blkdev_open(bdev, FMODE_READ, O_RDONLY, BDEV_RAW)
>
> blkdev_open is

grr... s/open/get/ - sorry.

> fs.h:extern int blkdev_open(struct inode *, struct file *);
>
> ... I can't see how to use it in this context.
>
> > > > > if (!bh || (!bh->b_data)) {
> > > > > return -1;
> >
> > However, I would really suggest to open the bugger once, do all IO and
> > then close it. See how raw.c and friends deal with these problems.
>
> Performance should not matter here.

Yeah, but amount of places that mess with kdev_t should.

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