From: Anthony PERARD <anthony.perard@citrix.com>
To: Paul Durrant <Paul.Durrant@citrix.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
Stefano Stabellini <sstabellini@kernel.org>,
"qemu-block@nongnu.org" <qemu-block@nongnu.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Max Reitz <mreitz@redhat.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH 03/18] xen: introduce 'xen-qdisk'
Date: Tue, 4 Dec 2018 15:49:08 +0000 [thread overview]
Message-ID: <20181204154908.GX14786__1468.75762516192$1543938491$gmane$org@perard.uk.xensource.com> (raw)
In-Reply-To: <311937f3c787461686f2ebf68a70a326@AMSPEX02CL03.citrite.net>
On Tue, Dec 04, 2018 at 03:20:04PM +0000, Paul Durrant wrote:
> > > +static char *disk_to_vbd_name(unsigned int disk)
> > > +{
> > > + unsigned int len = DIV_ROUND_UP(disk, 26);
> > > + char *name = g_malloc0(len + 1);
> > > +
> > > + do {
> > > + name[len--] = 'a' + (disk % 26);
> > > + disk /= 26;
> > > + } while (disk != 0);
> > > + assert(len == 0);
> > > +
> > > + return name;
> > > +}
> >
> > That function doesn't work.
> >
> > For a simple xvdp, (so disk==15), it return "", I mean "\0p".
> >
> > For a more complicated 'xvdbhwza', we have len == 22901. And the assert
> > failed.
> >
> > Maybe the recursing algo in libxl would be fine, with a buffer that is
> > big enough, and could probably be on the stack (in _get_vdev).
>
> I used libxl__device_disk_dev_number() as my model (as well as cross-checking with the spec), but I guess a recursing algorithm would be neater.
There is libxl__devid_to_vdev() actually just after ;-) which calls
encode_disk_name which is recursing.
> > > diff --git a/include/hw/xen/xen-qdisk.h b/include/hw/xen/xen-qdisk.h
> > > new file mode 100644
> > > index 0000000000..ade0866037
> > > --- /dev/null
> > > +++ b/include/hw/xen/xen-qdisk.h
> > > @@ -0,0 +1,38 @@
> > > +/*
> > > + * Copyright (c) Citrix Systems Inc.
> > > + * All rights reserved.
> > > + */
> > > +
> > > +#ifndef HW_XEN_QDISK_H
> > > +#define HW_XEN_QDISK_H
> > > +
> > > +#include "hw/xen/xen-bus.h"
> > > +
> > > +typedef enum XenQdiskVdevType {
> > > + XEN_QDISK_VDEV_TYPE_DP,
> >
> > Maybe we could set type_dp value to 1, so that, when vdev->type isn't
> > set, we can detect it later.
>
> Rather than having the 'valid' bool? Yes, that would work.
Well, the 'valid' bool doesn't seems to always be check so it would be
better. e.g. xen_qdisk_get_vdev() doesn't check `valid` before
genereting a string. Then xen_qdisk_set_vdev could set `type` to invalid
when it is invalid.
--
Anthony PERARD
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
next prev parent reply other threads:[~2018-12-04 15:49 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20181121151211.15997-1-paul.durrant@citrix.com>
2018-11-21 15:11 ` [PATCH 01/18] xen: re-name XenDevice to XenLegacyDevice Paul Durrant
2018-11-28 16:06 ` Anthony PERARD
2018-11-21 15:11 ` [PATCH 02/18] xen: introduce new 'XenBus' and 'XenDevice' object hierarchy Paul Durrant
2018-11-21 15:11 ` [PATCH 03/18] xen: introduce 'xen-qdisk' Paul Durrant
2018-11-21 15:11 ` [PATCH 04/18] xen: create xenstore areas for XenDevice-s Paul Durrant
2018-11-21 15:11 ` [PATCH 05/18] xen: add xenstore watcher infratructure Paul Durrant
2018-11-21 15:11 ` [PATCH 06/18] xen: add grant table interface for XenDevice-s Paul Durrant
2018-12-03 15:45 ` Anthony PERARD
2018-12-05 16:12 ` Paul Durrant
2018-11-21 15:12 ` [PATCH 07/18] xen: add event channel " Paul Durrant
2018-11-21 15:12 ` [PATCH 08/18] xen: duplicate xen_disk.c as basis of dataplane/xen-qdisk.c Paul Durrant
2018-12-03 16:35 ` Anthony PERARD
2018-12-03 16:42 ` Anthony PERARD
2018-11-21 15:12 ` [PATCH 09/18] xen: remove unnecessary code from dataplane/xen-qdisk.c Paul Durrant
2018-12-03 16:58 ` Anthony PERARD
2018-11-21 15:12 ` [PATCH 10/18] xen: add header and build dataplane/xen-qdisk.c Paul Durrant
2018-12-03 18:09 ` Anthony PERARD
[not found] ` <20181203180911.GQ14786@perard.uk.xensource.com>
2018-12-05 17:31 ` Paul Durrant
2018-11-21 15:12 ` [PATCH 11/18] xen: remove 'XenBlkDev' and 'blkdev' names from dataplane/xen-qdisk Paul Durrant
2018-11-21 15:12 ` [PATCH 12/18] xen: remove 'ioreq' struct/varable/field names from dataplane/xen-qdisk.c Paul Durrant
2018-12-04 11:34 ` Anthony PERARD
2018-11-21 15:12 ` [PATCH 13/18] xen: purge 'blk' and 'ioreq' from function names in dataplane/xen-qdisk.c Paul Durrant
2018-12-04 12:10 ` Anthony PERARD
2018-12-05 17:28 ` Paul Durrant
2018-11-21 15:12 ` [PATCH 14/18] xen: add implementations of xen-qdisk connect and disconnect functions Paul Durrant
2018-11-21 15:12 ` [PATCH 15/18] xen: add a mechanism to automatically create XenDevice-s Paul Durrant
2018-12-04 15:35 ` Anthony PERARD
2018-12-06 12:36 ` Paul Durrant
2018-12-06 15:24 ` Anthony PERARD
[not found] ` <20181206152406.GC18875@perard.uk.xensource.com>
2018-12-06 15:36 ` Paul Durrant
2018-11-21 15:12 ` [PATCH 16/18] xen: automatically create XenQdiskDevice-s Paul Durrant
2018-11-21 15:12 ` [PATCH 17/18] MAINTAINERS: add myself as a Xen maintainer Paul Durrant
2018-11-27 19:05 ` Stefano Stabellini
2018-11-29 14:00 ` [Qemu-devel] " Philippe Mathieu-Daudé
[not found] ` <a247dae0-a766-7f97-c16d-07a32572f35d@redhat.com>
2018-11-29 14:01 ` Paul Durrant
2018-12-04 16:42 ` Anthony PERARD
2018-11-21 15:12 ` [PATCH 18/18] xen: remove the legacy 'xen_disk' backend Paul Durrant
[not found] ` <20181121151211.15997-3-paul.durrant@citrix.com>
2018-11-28 16:19 ` [Qemu-block] [PATCH 02/18] xen: introduce new 'XenBus' and 'XenDevice' object hierarchy Kevin Wolf
[not found] ` <20181128161917.GE4222@dhcp-200-186.str.redhat.com>
2018-11-28 16:26 ` Paul Durrant
2018-11-28 16:28 ` Paul Durrant
2018-11-28 16:28 ` Stefano Stabellini
2018-11-28 16:29 ` Paul Durrant
2018-11-28 16:39 ` Kevin Wolf
2018-11-28 16:45 ` Paul Durrant
[not found] ` <5327ba765089439caf8119de49c3a399@AMSPEX02CL03.citrite.net>
2018-11-28 16:46 ` Paul Durrant
2018-11-29 9:04 ` Kevin Wolf
2018-11-28 17:01 ` [Qemu-devel] " Eric Blake
2018-11-28 17:04 ` Paul Durrant
2018-11-28 17:10 ` Anthony PERARD
2018-11-28 17:17 ` Paul Durrant
2018-11-28 17:32 ` Anthony PERARD
[not found] ` <20181121151211.15997-4-paul.durrant@citrix.com>
2018-11-29 16:05 ` [PATCH 03/18] xen: introduce 'xen-qdisk' Anthony PERARD
[not found] ` <20181129160541.GG14786@perard.uk.xensource.com>
2018-12-04 15:20 ` Paul Durrant
[not found] ` <311937f3c787461686f2ebf68a70a326@AMSPEX02CL03.citrite.net>
2018-12-04 15:49 ` Anthony PERARD [this message]
[not found] ` <20181204154908.GX14786@perard.uk.xensource.com>
2018-12-04 15:50 ` Paul Durrant
2018-12-04 17:14 ` Paul Durrant
[not found] ` <20181121151211.15997-5-paul.durrant@citrix.com>
2018-11-29 18:48 ` [PATCH 04/18] xen: create xenstore areas for XenDevice-s Anthony PERARD
[not found] ` <20181129184841.GJ14786@perard.uk.xensource.com>
2018-12-05 12:05 ` Paul Durrant
[not found] ` <589a4488f1ba4e4496775cc06bda291d@AMSPEX02CL03.citrite.net>
2018-12-05 12:43 ` Paul Durrant
[not found] ` <d5bf17f689a34e69b9e3b7b92bcfe4fd@AMSPEX02CL03.citrite.net>
2018-12-05 13:58 ` Anthony PERARD
[not found] ` <20181205135839.GB1259@perard.uk.xensource.com>
2018-12-05 14:24 ` Paul Durrant
2018-12-05 16:28 ` Anthony PERARD
[not found] ` <20181121151211.15997-6-paul.durrant@citrix.com>
2018-12-03 14:42 ` [PATCH 05/18] xen: add xenstore watcher infratructure Anthony PERARD
[not found] ` <20181203144231.GK14786@perard.uk.xensource.com>
2018-12-05 15:24 ` Paul Durrant
[not found] ` <20181121151211.15997-8-paul.durrant@citrix.com>
2018-12-03 16:24 ` [PATCH 07/18] xen: add event channel interface for XenDevice-s Anthony PERARD
2018-12-04 14:24 ` Anthony PERARD
2018-12-05 16:16 ` Paul Durrant
[not found] ` <20181121151211.15997-12-paul.durrant@citrix.com>
2018-12-04 11:05 ` [PATCH 11/18] xen: remove 'XenBlkDev' and 'blkdev' names from dataplane/xen-qdisk Anthony PERARD
[not found] ` <20181121151211.15997-15-paul.durrant@citrix.com>
2018-11-28 16:34 ` [PATCH 14/18] xen: add implementations of xen-qdisk connect and disconnect functions Kevin Wolf
2018-11-28 16:40 ` Paul Durrant
2018-11-29 9:00 ` Kevin Wolf
[not found] ` <20181129090046.GA4797@linux.fritz.box>
2018-11-29 9:33 ` Paul Durrant
[not found] ` <bdee6326dd3041f58202220a50abf9c8@AMSPEX02CL03.citrite.net>
2018-11-29 10:46 ` Kevin Wolf
2018-11-29 10:47 ` Paul Durrant
2018-12-04 12:33 ` Anthony PERARD
[not found] ` <20181204123349.GU14786@perard.uk.xensource.com>
2018-12-06 12:27 ` Paul Durrant
[not found] ` <20181121151211.15997-17-paul.durrant@citrix.com>
2018-12-04 16:40 ` [PATCH 16/18] xen: automatically create XenQdiskDevice-s Anthony PERARD
2018-12-06 13:06 ` Paul Durrant
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