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From: Mark Williamson <mark.williamson@cl.cam.ac.uk>
To: xen-devel@lists.xensource.com
Cc: Arjan van de Ven <arjan@infradead.org>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	Andrew Morton <akpm@osdl.org>,
	Ian Pratt <ian.pratt@xensource.com>,
	linux-kernel@vger.kernel.org, Chris Wright <chrisw@sous-sol.org>,
	virtualization@lists.osdl.org,
	Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Subject: Re: [Xen-devel] Re: [patch 20/20] XEN-paravirt: Add Xen virtual block device driver.
Date: Tue, 16 Jan 2007 02:53:42 +0000	[thread overview]
Message-ID: <200701160253.43218.mark.williamson@cl.cam.ac.uk> (raw)
In-Reply-To: <1168736848.3123.352.camel@laptopd505.fenrus.org>

> > +
> > +	err = xenbus_printf(xbt, dev->nodename,
> > +			    "ring-ref","%u", info->ring_ref);
>
> why do you need your own printf?

xenbus_printf isn't a printf replacement - it is used for writing a formatted 
string into XenStore (which contains  VM configuration data in a 
human-readable form).

Internally it does a vsnprintf into a buffer and writes the resulting string 
to the XenStore.

Cheers,
Mark

> > +static inline int GET_ID_FROM_FREELIST(
>
> does this really need screaming?
>
> > +
> > +int blkif_ioctl(struct inode *inode, struct file *filep,
> > +		unsigned command, unsigned long argument)
> > +{
> > +	int i;
> > +
> > +	DPRINTK_IOCTL("command: 0x%x, argument: 0x%lx, dev: 0x%04x\n",
> > +		      command, (long)argument, inode->i_rdev);
> > +
> > +	switch (command) {
> > +	case CDROMMULTISESSION:
> > +		DPRINTK("FIXME: support multisession CDs later\n");
> > +		for (i = 0; i < sizeof(struct cdrom_multisession); i++)
> > +			if (put_user(0, (char __user *)(argument + i)))
> > +				return -EFAULT;
> > +		return 0;
> > +
> > +	default:
> > +		/*printk(KERN_ALERT "ioctl %08x not supported by Xen blkdev\n",
> > +		  command);*/
> > +		return -EINVAL; /* same return as native Linux */
> > +	}
>
> eh so you implement no ioctls.. why then implement the ioctl method at
> all?

I'm not familiar with this code...  but perhaps the (fake) multisession 
handling is to keep userspace that queries this happy?  I can't really think 
of anywhere this would apply off the top of my head, though.

Cheers,
Mark

> > +static struct xenbus_driver blkfront = {
> > +	.name = "vbd",
> > +	.owner = THIS_MODULE,
> > +	.ids = blkfront_ids,
> > +	.probe = blkfront_probe,
> > +	.remove = blkfront_remove,
> > +	.resume = blkfront_resume,
> > +	.otherend_changed = backend_changed,
> > +};
>
> this can be const
>
> > +
> > +#define DPRINTK(_f, _a...) pr_debug(_f, ## _a)
>
> why this silly abstraction? Just use pr_debug in the code directly
>
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

  parent reply	other threads:[~2007-01-16  3:19 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-13  1:45 [patch 00/20] XEN-paravirt: Xen guest implementation for paravirt_ops interface Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 01/20] XEN-paravirt: Fix typo in sync_constant_test_bit()s name Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 02/20] XEN-paravirt: Add a flag to allow the VGA console to be disabled Jeremy Fitzhardinge
2007-01-14  0:27   ` [Xen-devel] " Alan
2007-01-13  1:45 ` [patch 03/20] XEN-paravirt: paravirt: page-table accessors Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 04/20] XEN-paravirt: paravirt pagetable init Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 05/20] XEN-paravirt: paravirt: reserve fixmap slot Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 06/20] XEN-paravirt: remove pgd ctor Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 07/20] XEN-paravirt: paravirt shared kernel pmd flag Jeremy Fitzhardinge
2007-01-15  8:59   ` [Xen-devel] " Jan Beulich
2007-01-13  1:45 ` [patch 08/20] XEN-paravirt: paravirt pgd allocation alignment Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 09/20] XEN-paravirt: dont export paravirt_ops structure, do individual functions Jeremy Fitzhardinge
2007-01-14  0:57   ` Rusty Russell
2007-01-13  1:45 ` [patch 10/20] XEN-paravirt: mm lifetime hooks Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 11/20] XEN-paravirt: Add apply_to_page_range() which applies a function to a pte range Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 12/20] XEN-paravirt: Xen: Add nosegneg capability to the vsyscall page notes Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 13/20] XEN-paravirt: Xen: Add config options and disable unsupported config options Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 15/20] XEN-paravirt: Xen: core paravirt guest changes Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 16/20] XEN-paravirt: Add the Xen virtual console driver Jeremy Fitzhardinge
2007-01-14  0:37   ` Alan
2007-01-14  0:35     ` Jeremy Fitzhardinge
2007-01-15 13:03   ` Pavel Machek
2007-01-19  4:11     ` Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 17/20] XEN-paravirt: Add Xen grant table support Jeremy Fitzhardinge
2007-01-15 13:05   ` Pavel Machek
2007-01-19  4:07     ` Jeremy Fitzhardinge
2007-01-13  1:45 ` [patch 18/20] XEN-paravirt: Add Xen driver utility functions Jeremy Fitzhardinge
2007-01-14  7:41   ` Greg KH
2007-01-13  1:45 ` [patch 19/20] XEN-paravirt: Add the Xenbus sysfs and virtual device hotplug driver Jeremy Fitzhardinge
2007-01-15 13:18   ` Pavel Machek
2007-01-13  1:45 ` [patch 20/20] XEN-paravirt: Add Xen virtual block device driver Jeremy Fitzhardinge
2007-01-14  1:07   ` Arjan van de Ven
2007-01-14  7:43     ` Greg KH
2007-01-16  2:53     ` Mark Williamson [this message]
2007-01-14 11:05   ` Jan Engelhardt
2007-01-14 11:24     ` Muli Ben-Yehuda
2007-01-14 11:35       ` Jan Engelhardt
2007-01-14 12:37     ` Keir Fraser

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