Re: [PATCH 11/15] target: add sysfs support

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On 5/10/20 11:57 PM, Mike Christie wrote:
These next two patches add a sysfs interface that reports the target
layer's I_T nexuses/sessions. For the non-SCSI people cc'd, this just means
we are reporting a server's connections to remote clients.

This patch adds the upper level dirs which shows/organizes our local port
(tpgts below) and the connection (session below). The next patch will then
add the dirs/files for each connection/session which exports info like
ACL/permissions and SCSI port values.

Here is the general layout:

[sys]# tree scsi_target/
scsi_target/
|-- fabric/target module
|   `-- target name
|       `-- tpgt_$target_port_group_number
|           `-- sessions
|               `-- initiator name - session ID number
|                   |-- acl
|                   `-- transport_id
|                       |-- name
|                       |-- proto
|                       `-- session_id

Here is an example with the scsi target layer's iSCSI driver:

scsi_target/
|-- iscsi
|   `-- iqn.1999-09.com.tcmu:minna
|       `-- tpgt_1
|           `-- sessions
|               `-- iqn.2005-03.com.ceph:ini1-1
|                   |-- acl
|                   `-- transport_id
|                       |-- name
|                       |-- proto
|                       `-- session_id
|-- fc
|-- loopback
|-- qla2xxx_tcm


I'm not sure if we want to include the actual name for the target name or initiatorname; that we we'll get an instant denial of service if we fail to cleanup this directory and want to recreate a new one. Normally we have been using logical names for sysfs directories (ie targertport0 or session0) and include the actual names in a sysfs attribute. That way the structure can stay around for slightly longer (ie for cleanup operations) _and_ we can create a new one to allow new connections with the same credentials.

Cheers,

Hannes
--
Dr. Hannes Reinecke            Teamlead Storage & Networking
hare@xxxxxxx                               +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer



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