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From: "Ewan D. Milne" <emilne@redhat.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>,
	James Bottomley <jejb@linux.ibm.com>
Cc: axboe@kernel.dk, Chaitanya.Kulkarni@wdc.com, mst@redhat.com,
	linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
	linux-block@vger.kernel.org, ssomesh@amazon.com,
	Balbir Singh <sblbir@amazon.com>,
	hch@lst.de
Subject: Re: [resend v1 5/5] drivers/scsi/sd.c: Convert to use disk_set_capacity
Date: Tue, 07 Jan 2020 16:37:43 -0500	[thread overview]
Message-ID: <1eb9d796f81fffbb0bfe90bff8460bcda34cb04d.camel@redhat.com> (raw)
In-Reply-To: <yq1y2uj283m.fsf@oracle.com>

On Mon, 2020-01-06 at 23:39 -0500, Martin K. Petersen wrote:
> James,
> 
> > > We already emit an SDEV_EVT_CAPACITY_CHANGE_REPORTED event if device
> > > capacity changes. However, this event does not automatically cause
> > > revalidation.
> > 
> > Which I seem to remember was a deliberate choice: some change
> > capacities occur because the path goes passive and default values get
> > installed.
> 
> Yep, it's very tricky territory.
> 

Yes, there are some storage arrays that refuse a READ CAPACITY
command in certain ALUA states so you can't get the new capacity anyway.

It might be nice to improve this, though, there are some cases now where
we set the capacity to zero when we revalidate and can't get the value.

-Ewan




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  reply	other threads:[~2020-01-07 21:40 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 [this message]
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
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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