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s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=NlR/GC12Ant3qA/m2EG7aiXOZv1rWEA2puHWoOlThvk=; b=tpZlY6ywIhJdrehDn66QS/ZHA6Y/zI2J7Y4sDAk/n5ULtMszYv/YPms/GAAOwP2Hh1 zQTDbYnfXFvVh6AvR/Z/AblQoPGR7FjXSbC9XufjgeOKQtPTAxwT9iHJl4MBceUHCUbi naFLvhEORyLnuTn1C9Oya/CYTNtNxvtVouR9fPgyvNPBX5Et6Jc0Fh+0q6r8av3uAQgw 5Aa7djWNrCEcIdKk34ownBqAi4rh5lbFdeK7jEuAao+d7E17ZIGGc7sHP7cRz/NKY8dl ngHS6UY/3bbBNXK5aIvwe9sNdLGmgwqNz9jgYaMK8ouo/rUTa+ZLQYg1YAuZd9+P56DY vcTw== X-Gm-Message-State: AOAM533nwGrGNPXKSt0Up+hWC/hlhsjH/d1u/ZwCyzUZmoacffSgHEUF zi/VICJQkPg/EZKRjx4OscfGMKORSlciK1/buAQ= X-Google-Smtp-Source: ABdhPJxlFZlMH4/RwDxHGn0TmaGDscWKIkmM65u0I7O18VbZyKglpI3N2Dmu8109b6xquQZlsL/c7UbTpYvUmriIzLU= X-Received: by 2002:a05:600c:20c:: with SMTP id 12mr12939653wmi.138.1619066002313; Wed, 21 Apr 2021 21:33:22 -0700 (PDT) MIME-Version: 1.0 References: <20210421074504.57750-1-minwoo.im.dev@gmail.com> <20210421074504.57750-2-minwoo.im.dev@gmail.com> In-Reply-To: <20210421074504.57750-2-minwoo.im.dev@gmail.com> From: Kanchan Joshi Date: Thu, 22 Apr 2021 10:02:55 +0530 Message-ID: Subject: Re: [PATCH V3 1/1] nvme: introduce generic per-namespace chardev To: Minwoo Im Cc: linux-nvme@lists.infradead.org, Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg , =?UTF-8?Q?Javier_Gonz=C3=A1lez?= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210421_213324_680491_8A48D2E3 X-CRM114-Status: GOOD ( 14.55 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Wed, Apr 21, 2021 at 1:23 PM Minwoo Im wrote: > > Userspace has not been allowed to I/O to device that's failed to > be initialized. This patch introduces generic per-namespace character > device to allow userspace to I/O regardless the block device is there or > not. > > The chardev naming convention will similar to the existing blkdev naming, > using a ng prefix instead of nvme, i.e. > > - /dev/ngXnY > > It also supports multipath which means it will not expose chardev for the > hidden namespace blkdevs (e.g., nvmeXcYnZ). If /dev/ngXnY is created for > a ns_head, then I/O request will be routed to a specific controller > selected by the iopolicy of the subsystem. Tested-by: Kanchan Joshi -- Joshi _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme