Re: CD writing in future Linux (stirring up a hornets' nest)

[Krzysztof Halasa <khc@pm.waw.pl>]

Jan Engelhardt <jengelh@linux01.gwdg.de> writes:

> I would say we all forgot to RTFM. Because O_EXCL does nothing *unless* 
> O_CREAT is specified, which probably *is not* specified in cdrecord or 
> hal.

That would be the case if the CD writter wasn't a block device.

For a block device fs/block_dev.c:

static int blkdev_open(struct inode * inode, struct file * filp)
{
...

        if (!(filp->f_flags & O_EXCL) )
                return 0;

        if (!(res = bd_claim(bdev, filp)))
                return 0;

        blkdev_put(bdev);
        return res;
-- 
Krzysztof Halasa
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