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Milne" Cc: "Martin K. Petersen" , James Bottomley , 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 , hch@lst.de Subject: Re: [resend v1 5/5] drivers/scsi/sd.c: Convert to use disk_set_capacity From: "Martin K. Petersen" Organization: Oracle Corporation References: <20200102075315.22652-1-sblbir@amazon.com> <20200102075315.22652-6-sblbir@amazon.com> <1578369479.3251.31.camel@linux.ibm.com> <1eb9d796f81fffbb0bfe90bff8460bcda34cb04d.camel@redhat.com> Date: Tue, 07 Jan 2020 21:59:58 -0500 In-Reply-To: <1eb9d796f81fffbb0bfe90bff8460bcda34cb04d.camel@redhat.com> (Ewan D. Milne's message of "Tue, 07 Jan 2020 16:37:43 -0500") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9493 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=920 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001080024 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9493 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=981 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001080024 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ewan, > 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. Yep. And some devices will temporarily return a capacity of 0xFFFFFFFF... If we were to trigger a filesystem resize, the results would be disastrous. > 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. If you have a test case, let's fix it. -- Martin K. Petersen Oracle Linux Engineering