linux-kernel - Re: [PATCH] scsi:iscsi: Record session's startup mode in kernel

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Message-ID: <11003745-2b2d-30cf-bf87-798f5175ae09@oracle.com>
Date:   Tue, 22 Nov 2022 10:58:48 -0600
From:   Mike Christie <michael.christie@...cle.com>
To:     Wenchao Hao <haowenchao@...wei.com>, Lee Duncan <lduncan@...e.com>,
        Chris Leech <cleech@...hat.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, liuzhiqiang26@...wei.com,
        linfeilong@...wei.com
Subject: Re: [PATCH] scsi:iscsi: Record session's startup mode in kernel

On 11/22/22 3:30 PM, Wenchao Hao wrote:
> There are 3 iscsi session's startup mode which are onboot, manual and
> automatic. We can boot from iSCSI disks with help of dracut's service
> in initrd, which would set node's startup mode to onboot, then create
> iSCSI sessions.
> 
> While the configure of onboot mode is recorded in file of initrd stage
> and would be lost when switch to rootfs. Even if we update the startup
> mode to onboot by hand after switch to rootfs, it is possible that the
> configure would be covered by another discovery command.
> 
> root would be mounted on iSCSI disks when boot from iSCSI disks, if the
> sessions is logged out, the related disks would be removed, which would
> cause the whole system halt.

The userspace tools check for this already don't they? Running iscsiadm
on the root disk returns a failure and message about it being in use.

Userspace can check the session's disks and see if they are mounted and
what they are being used for.