Commit 8382bf2e authored by Peter Osterlund's avatar Peter Osterlund Committed by Linus Torvalds
Browse files

[PATCH] pktcdvd: Use bd_claim to get exclusive access 



Use bd_claim() when opening the cdrom device to prevent user space programs
such as cdrecord, hald and kded from interfering with the burning process.

Signed-off-by: default avatarPeter Osterlund <petero2@telia.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 97a41e26

drivers/block/pktcdvd.c

+9 −3
Original line number Diff line number Diff line
@@ -1955,9 +1955,12 @@ static int pkt_open_dev(struct pktcdvd_device *pd, int write) 
	if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))

		goto out;



	if ((ret = bd_claim(pd->bdev, pd)))

		goto out_putdev;



	if ((ret = pkt_get_last_written(pd, &lba))) {

		printk("pktcdvd: pkt_get_last_written failed\n");

		goto out_putdev;

		goto out_unclaim;

	}



	set_capacity(pd->disk, lba << 2);
@@ -1967,7 +1970,7 @@ static int pkt_open_dev(struct pktcdvd_device *pd, int write) 
	q = bdev_get_queue(pd->bdev);

	if (write) {

		if ((ret = pkt_open_write(pd)))

			goto out_putdev;

			goto out_unclaim;

		/*

		 * Some CDRW drives can not handle writes larger than one packet,

		 * even if the size is a multiple of the packet size.
@@ -1982,13 +1985,15 @@ static int pkt_open_dev(struct pktcdvd_device *pd, int write) 
	}



	if ((ret = pkt_set_segment_merging(pd, q)))

		goto out_putdev;

		goto out_unclaim;



	if (write)

		printk("pktcdvd: %lukB available on disc\n", lba << 1);



	return 0;



out_unclaim:

	bd_release(pd->bdev);

out_putdev:

	blkdev_put(pd->bdev);

out:
@@ -2007,6 +2012,7 @@ static void pkt_release_dev(struct pktcdvd_device *pd, int flush) 
	pkt_lock_door(pd, 0);



	pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);

	bd_release(pd->bdev);

	blkdev_put(pd->bdev);

}

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