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Re: [PATCH 01/29] xen/public: add some more 9pfs xenstore paths


  • To: Jason Andryuk <jandryuk@xxxxxxxxx>
  • From: Juergen Gross <jgross@xxxxxxxx>
  • Date: Thu, 2 Nov 2023 08:15:36 +0100
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  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 02 Nov 2023 07:15:45 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 01.11.23 19:31, Jason Andryuk wrote:
On Wed, Nov 1, 2023 at 7:24 AM Juergen Gross <jgross@xxxxxxxx> wrote:

Add some optional additional backend paths for 9pfs PV devices. Those
paths will be supported by the new xenlogd 9pfs backend.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
  xen/include/public/io/9pfs.h | 34 ++++++++++++++++++++++++++++++++++
  1 file changed, 34 insertions(+)

diff --git a/xen/include/public/io/9pfs.h b/xen/include/public/io/9pfs.h
index 9ad2773082..ac4bf0434b 100644
--- a/xen/include/public/io/9pfs.h
+++ b/xen/include/public/io/9pfs.h
@@ -71,6 +71,40 @@
   *                 created on the guest (no user ownership squash or remap)
   *         Only "none" is supported in this version of the protocol.
   *
+ *    max-files
+ *         Values:        <uint32_t>
+ *
+ *         The maximum number of files (including directories) allowed for
+ *         this device. Backend support of this node is optional. If the node
+ *         is not present or the value is zero the number of files is not
+ *         limited.
+ *
+ *    max-open-files
+ *         Values:        <uint32_t>
+ *
+ *         The maximum number of files the guest is allowed to have opened
+ *         concurrently. Multiple concurrent opens of the same file are counted
+ *         individually. Backend support of this node is optional. If the node
+ *         is not present or the value is zero a backend specific default is
+ *         applied.
+ *
+ *    max-space
+ *         Values:        <uint32_t>
+ *
+ *         The maximum file space in MiBs the guest is allowed to use for this
+ *         device. Backend support of this node is optional. If the node is
+ *         not present or the value is zero the space is not limited.
+ *
+ *    auto-delete
+ *         Values:        <bool>
+ *
+ *         When set to "1" the backend will delete the file with the oldest
+ *         modification date below <path> in case the allowed maximum file
+ *         space (see <max-space>) or file number (see <max-files>) is being
+ *         exceeded due to guest activity (creation or extension of files).
+ *         Files currently opened by the guest won't be deleted. Backend
+ *         support of this node is optional.
+ *

These seem reasonable, but it looks like xenlogd only implements
max-open-files.  They are all marked optional, so I guess it's okay to
include them.  Is there a plan to implement them?  Maybe hold off
until an implementation comes along?

See the cover letter of the series.


Juergen

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