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Wed, 26 Aug 2026 16:18:16 +0000 (GMT) Received: from ltc.linux.ibm.com (unknown [9.5.196.140]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 26 Aug 2026 16:18:16 +0000 (GMT) MIME-Version: 1.0 Date: Wed, 26 Aug 2026 11:18:16 -0500 From: Wen Xiong To: Nilay Shroff Cc: linux-nvme@lists.infradead.org, kbusch@kernel.org, gjoyce@linux.ibm.com, wenxiong@us.ibm.com Subject: Re: [PATCH V2] nvme: Add module reference counting for multipath devices In-Reply-To: References: <20260812223206.720363-1-wenxiong@linux.ibm.com> Message-ID: X-Sender: wenxiong@linux.ibm.com Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=TfimcxQh c=1 sm=1 tr=0 ts=6a8f11cc cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=kj9zAlcOel0A:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=ploPxCd_3tu-NVudjoYA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI2MDEzNCBTYWx0ZWRfXwBMmCbllE+lB HuS/nfCWnNYDYLwjZh4Z8SCcfMl8zTlCzRicgqNxpbc4i4rVWmpwPUN4ffjw9Bc0ljJ37Rw8k5Y MJIotIJMxThFwxclvQcRtSyvHjmI5x0= X-Proofpoint-GUID: nIKCRrERL8KlQ1eQPp_NxxhQbnCt4RRU X-Proofpoint-ORIG-GUID: nIKCRrERL8KlQ1eQPp_NxxhQbnCt4RRU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI2MDEzNCBTYWx0ZWRfX4rAfDiZ6oWKP cXLl43g7/QaaHhzX8cIbXyHFZh7wDXcdtg/w9eAxtnZhtMVLB7dOc4jK3QVUmf6NcjbKL25J64v tRmO5RisHQZDxjbcMnmZfjnVSlvZoUjaBk81N4SPZDx1lStDZKWRiOj17SyrLyPfstCP+q6Igqn akHiU8sVJENegM5uTkYTyaH8D/ODtEzYEQXM0o6QAf2juD3bWgnuhlKqPI7haJVlY0zJnvhf6sn eCU1IhQl3nqiAeTZV6nW+KV3ekWqRQFHkwV+t9mzTwOkRTTjLL0MO1FA3A3LKalFVu6UF394OlC Yu8zUL3q6pkoEQLSBrGdZF1MVXPa4fRE4Lpf1pWsTTwHt5dNUkuCKDrSA//4Pb/Z5Ls1uxJ0Gw8 OQG+PJV+beiWkgYcAgOJqFS+VhcXIla2qxqCYcIGIHGkTN7F2xskoCrc+5riwAcAiL4CT7yNq8q dSLPN2UY+xQvWqWYcLQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-26_04,2026-08-26_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 phishscore=0 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608260134 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260826_091823_657603_975808E8 X-CRM114-Status: GOOD ( 13.47 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 2026-08-26 07:40, Nilay Shroff wrote: > Also, since a multipath head can have paths through different > transports > , we should not take a reference only to the transport of one > namespace/path > found through nvme_find_path(), as was done in v1. Instead, when > opening the > head, take a module reference iterating through each controller > reachable > from the corresponding NVMe subsystem. This ensures that every > transport > that can service I/O for the active multipath namespace remains loaded > for > the duration of its use. > I will look into iterating though each controller/each namespace from nvme subsystem. Thanks, Wendy