From: Bart Van Assche <bvanassche@acm.org>
To: Johannes Thumshirn <jthumshirn@suse.de>,
Max Gurtovoy <maxg@mellanox.com>,
Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
Christoph Hellwig <hch@lst.de>
Cc: Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
Linux NVMe Mailinglist <linux-nvme@lists.infradead.org>
Subject: Re: [PATCH] nvmet: disable direct I/O when unavailable
Date: Mon, 25 Feb 2019 06:49:04 -0800 [thread overview]
Message-ID: <a85e85d6-6a06-7663-3a12-710b6467dedd@acm.org> (raw)
In-Reply-To: <2185e4e5-086a-d0c2-0fee-a7a5c98267bb@suse.de>
On 2/25/19 1:37 AM, Johannes Thumshirn wrote:
> On 24/02/2019 11:54, Max Gurtovoy wrote:
>> What is the status of iSCSI/SRP targets in this case ?
>
> iSCSI/SRP passes in the following:
>
> /*
> * Use O_DSYNC by default instead of O_SYNC to forgo syncing
> * of pure timestamp updates.
> */
> flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
That code fragment comes from the LIO file backend. There is no
requirement for a SCSI target core file backend to use O_DSYNC. SCST
allows users to choose whether or not O_DSYNC should be used:
if (virt_dev->wt_flag && !virt_dev->nv_cache)
open_flags |= O_DSYNC;
Bart.
next prev parent reply other threads:[~2019-02-25 14:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-21 18:22 Johannes Thumshirn
2019-02-22 0:41 ` Chaitanya Kulkarni
2019-02-22 5:55 ` Johannes Thumshirn
2019-02-24 10:54 ` Max Gurtovoy
2019-02-25 9:37 ` Johannes Thumshirn
2019-02-25 14:49 ` Bart Van Assche [this message]
2019-02-25 15:38 ` Johannes Thumshirn
2019-02-25 16:10 ` Bart Van Assche
2019-02-25 21:18 ` Sagi Grimberg
2019-03-08 13:26 ` Christoph Hellwig
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