Difficulty with RH 6.x and LVM

Forwarded message from Eric M. Hopper <[email protected]> ...

-------- Original Message --------
From: "Eric M. Hopper" <[email protected]>
Subject: Difficulty with RH 6.x and LVM
Message-ID: <[email protected]>

The lines in the patches assume that the kernel to be patched
calls md_make_request like this:

md_make_request(MINOR (bh[i]->b_dev), rw, bh[i]);

The RedHat 6.x kernels seem to have a different md_make_request
that they call like this:

md_make_request(bh[i], rw);

As you may notice, there is a large discrepancy here that is
rather worrisome, since the change to use rdev instead of dev can't be made in any way.

In drivers/block/md.c, RedHat's md_make_request looks like this:

int md_make_request (struct buffer_head * bh, int rw)

{
	int err;
	mddev_t *mddev = kdev_to_mddev(bh->b_dev);

	if (!mddev || !mddev->pers) {
		err = -ENXIO;
		goto out;
	}

	if (mddev->pers->make_request) {
		if (buffer_locked(bh)) {
			err = 0;
			goto out;
		}
		set_bit(BH_Lock, &bh->b_state);
		if (rw == WRITE || rw == WRITEA) {
			if (!buffer_dirty(bh)) {
				bh->b_end_io(bh, buffer_uptodate(bh));
				err = 0;
				goto out;
			}
		}
		if (rw == READ || rw == READA) {
			if (buffer_uptodate(bh)) {
				bh->b_end_io(bh, buffer_uptodate(bh));
				err = 0;
				goto out;
			}
		}
		err = mddev->pers->make_request(mddev, rw, bh);
	} else {
		make_request (MAJOR(bh->b_rdev), rw, bh);
		err = 0;
	}
out:
	return err;
}

Any suggestions as to how I apply the patch?

Thanks,
--
Its name is Public Opinion. It is held in reverence. It settles everything.
Some think it is the voice of God. Loyalty to petrified opinion never yet
broke a chain or freed a human soul. ---Mark Twain
-- Eric Hopper ([email protected]
http://omnifarious.mn.org/~hopper) --