linux-kernel - Re: [PATCH] scsi: iscsi_tcp: set BDI_CAP_STABLE

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Message-ID: <yq1a7v31l7i.fsf@oracle.com>
Date:   Mon, 19 Mar 2018 23:26:25 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     lduncan@...e.com, cleech@...hat.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, open-iscsi@...glegroups.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: iscsi_tcp: set BDI_CAP_STABLE_WRITES when data digest enabled


Jianchao,

> iscsi tcp will first send out data, then calculate and send data
> digest. If we don't have BDI_CAP_STABLE_WRITES, the page cache will
> be written in spite of the on going writeback. Consequently, wrong
> digest will be got and sent to target.
>
> To fix this, set BDI_CAP_STABLE_WRITES when data digest is enabled
> in iscsi_tcp .slave_configure callback.

Applied to 4.16/scsi-fixes. Thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering