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[PATCH] pktcdvd: Use bd_claim to get exclusive access

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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: Peter Osterlund <petero2@telia.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Osterlund 2006-01-08 01:02:17 -08:00 committed by Linus Torvalds
parent 97a41e2612
commit 8382bf2e72
1 changed files with 9 additions and 3 deletions
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12
drivers/block/pktcdvd.c
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@ -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);
}