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Thu, 16 Jul 2026 15:16:19 +0000 (GMT) Received: from [9.123.7.57] (unknown [9.123.7.57]) by smtpav03.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 16 Jul 2026 15:16:18 +0000 (GMT) Message-ID: Date: Thu, 16 Jul 2026 20:46:17 +0530 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4] nvme/069: add a test for multipath cdev lifetime To: John Garry , shinichiro.kawasaki@wdc.com, linux-block@vger.kernel.org Cc: hch@lst.de, linux-nvme@lists.infradead.org, dwagner@suse.de, John Garry References: <20260716082927.4053505-1-john.g.garry@oracle.com> Content-Language: en-US From: Nilay Shroff In-Reply-To: <20260716082927.4053505-1-john.g.garry@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE2MDE1NiBTYWx0ZWRfX349cFwQqVb0b Ac7+fTbAViq/KSCihxCQoTxX2fV4oqW6636ZjhgVaOyo4aIpzdERuTu4Z06n8XDVPX5U5Im0kYB NgaIxeewpXD5UDuMegchDl+0wem7iiM= X-Proofpoint-GUID: BJ5vKzo4cLaUeD8fFnbOc3i3D4NVGG0N X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE2MDE1NiBTYWx0ZWRfX+7fkkDgSlXNY Z5hFCK6oRp5mQR7owTIRxa+OjEYMzRePrYL1/rZsKi8189ZcteTws8odBUisDVjA1QxEHwaHrcE yo1zv8iffr/rMkXK7xdHKHHNWuwQS+lDF9ZgPNasAVQto3I/9lxbbNUw5BzPRYM6GHT7g0uiImJ /sTo3br61o2cj5teA8Tmo4eubAvv1Z4SnxpUTi4sncJs5V9EwTWZpLn61RQpEpa4+V4iQ9dgPq1 tdFmZnKDPzSQdrTigoziEN5PKzfkuQgdg53fenO04mbS+4OCz2FeRuVl0/smx1FYalhRRj1Mb8i IZzpHN5fQa70q9qWdHi5Fi32zPSndnx4QNvhc7i5Il213VH7WttfZmRf+9UMdbXjGN1deUNncaC uftTMFS+gh8vo7sVSpuFMkUZIalR3fWCThQVizOpUeVYgh1xE5NHsxXMJKoHK2w6SR0qvKVly6k O9m45Cb97lzHWRjsT7A== X-Proofpoint-ORIG-GUID: BJ5vKzo4cLaUeD8fFnbOc3i3D4NVGG0N X-Authority-Analysis: v=2.4 cv=PvajqQM3 c=1 sm=1 tr=0 ts=6a58f5c7 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=USU_oUL85gQPAiYJZBAA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-16_05,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 bulkscore=0 impostorscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 suspectscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607160156 On 7/16/26 1:59 PM, John Garry wrote: > +#include > +#include > +#include > + > +#ifndef _LINUX_NVME_IOCTL_H > +#define _LINUX_NVME_IOCTL_H > +#define NVME_IOCTL_ID _IO('N', 0x40) > +#endif /* _UAPI_LINUX_NVME_IOCTL_H */ > + > +int main(int argc, char **argv) > +{ > + int fd, fd1; > + int count; > + > + if (argc < 2) { > + fprintf(stderr, "usage: %s /dev/ngXnX", argv[0]); > + return EINVAL; > + } > + > + fd = open(argv[1], O_RDONLY); > + if (fd < 0) > + return fd; > + > + /* > + * Steps: > + * a. Signal to parent that we have opened the file so that it may > + * start the teardown. > + * b. Try to open device until disallowed/gone. > + * c. Sleep to allow nvme-subsystem be torn down. > + * d. Issue the ioctl on original fd. > + */ > + kill(getppid(), SIGUSR2); > + count = 0; > + for (;;) { > + fd1 = open(argv[1], O_RDONLY); > + usleep(500000); > + if (fd1 < 0) > + break; Does it make sense to check for errno set to ENODEV or ENOENT before breaking out here? Thanks, --Nilay