From: "Ewan D. Milne" <emilne@redhat.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>,
"Singh, Balbir" <sblbir@amazon.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
"Chaitanya.Kulkarni@wdc.com" <Chaitanya.Kulkarni@wdc.com>,
"mst@redhat.com" <mst@redhat.com>,
"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"Sangaraju, Someswarudu" <ssomesh@amazon.com>,
"hch@lst.de" <hch@lst.de>
Subject: Re: [resend v1 5/5] drivers/scsi/sd.c: Convert to use disk_set_capacity
Date: Wed, 08 Jan 2020 16:32:28 -0500 [thread overview]
Message-ID: <8339b890eec74c423fa2260a90fcc2154cf05b53.camel@redhat.com> (raw)
In-Reply-To: <yq1blre1vwr.fsf@oracle.com>
On Tue, 2020-01-07 at 22:15 -0500, Martin K. Petersen wrote:
> Balbir,
>
> > > We already emit an SDEV_EVT_CAPACITY_CHANGE_REPORTED event if device
> > > capacity changes. However, this event does not automatically cause
> > > revalidation.
> >
> > The proposed idea is to not reinforce revalidation, unless explictly
> > specified (in the thread before Bob Liu had suggestions). The goal is
> > to notify user space of changes via RESIZE. SCSI sd can opt out of
> > this IOW, I can remove this if you feel
> > SDEV_EVT_CAPACITY_CHANGE_REPORTED is sufficient for current use cases.
Remember that this event is generated because of a Unit Attention from
the device. We are only passing on this indication to udev. It basically
allows automation without having to scrape the log file. We don't proactively
look. e.g. in the case of SCSI unless you have commands being sent to the
device to return the UA status you won't hear about it.
>
> I have no particular objection to the code change. I was just observing
> that in the context of sd.c, RESIZE=1 is more of a "your request to
> resize was successful" notification due to the requirement of an
> explicit userland action in case a device reports a capacity change.
>
next prev parent reply other threads:[~2020-01-08 21:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-02 7:53 [resend v1 0/5] Add support for block disk resize notification Balbir Singh
2020-01-02 7:53 ` [resend v1 1/5] block/genhd: Notify udev about capacity change Balbir Singh
2020-01-03 6:16 ` Chaitanya Kulkarni
2020-01-04 4:44 ` Singh, Balbir
2020-01-04 22:32 ` Chaitanya Kulkarni
2020-01-08 15:02 ` hch
2020-01-07 3:32 ` Martin K. Petersen
2020-01-07 22:30 ` Singh, Balbir
2020-01-08 3:15 ` Martin K. Petersen
2020-01-08 15:04 ` hch
2020-01-21 19:57 ` Singh, Balbir
2020-01-02 7:53 ` [resend v1 2/5] drivers/block/virtio_blk.c: Convert to use disk_set_capacity Balbir Singh
2020-01-02 7:53 ` [resend v1 3/5] drivers/block/xen-blkfront.c: " Balbir Singh
2020-01-02 7:53 ` [resend v1 4/5] drivers/nvme/host/core.c: " Balbir Singh
2020-01-04 22:27 ` Chaitanya Kulkarni
2020-01-06 0:46 ` Singh, Balbir
2020-01-08 15:04 ` hch
2020-01-09 3:33 ` Martin K. Petersen
2020-01-09 13:12 ` Ewan D. Milne
2020-01-21 19:52 ` Singh, Balbir
2020-01-02 7:53 ` [resend v1 5/5] drivers/scsi/sd.c: " Balbir Singh
2020-01-02 22:21 ` Chaitanya Kulkarni
2020-01-03 0:23 ` Singh, Balbir
2020-01-07 3:48 ` Martin K. Petersen
2020-01-07 3:57 ` James Bottomley
2020-01-07 4:39 ` Martin K. Petersen
2020-01-07 21:37 ` Ewan D. Milne
2020-01-08 2:59 ` Martin K. Petersen
2020-01-08 21:27 ` Ewan D. Milne
2020-01-07 22:28 ` Singh, Balbir
2020-01-08 3:15 ` Martin K. Petersen
2020-01-08 4:20 ` Singh, Balbir
2020-01-08 21:32 ` Ewan D. Milne [this message]
2020-01-08 15:06 ` Christoph Hellwig
2020-01-09 2:53 ` Martin K. Petersen
2020-01-06 5:59 ` [resend v1 0/5] Add support for block disk resize notification Bob Liu
2020-01-06 8:47 ` Singh, Balbir
2020-01-06 9:08 ` Bob Liu
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