12/9/2023 0 Comments Loop back deviceNote that, when shrinking a partition, the order of these steps is the other way round: first, resize the file system, then resize the partition (and tell the kernel about the changes if needed), then reduce the size of the backing file). (Unmounting the two file systems will also allow you to shrink or move your partitions around. Also, to be able to resize the file systems we need to make the kernel know about the changed partition table: $ sudo parted <<'EOT' Without unmounting the two partitions, we will only be able to grow them and the contained file systems by the amount of free space on their right (only /dev/loop0p2 can be extended in our case). Then we can grow the file that backs our loop device and let losetup re-read the file's size to update the capacity of loop0: $ fallocate -l 200M volume └─loop0p2 259:1 0 52M 0 part /path/to/mp2įilesystem Size Used Avail Use% Mounted on Maybe this serves as an explanation: The kernel implements several layers of abstraction so that it can treat different hardware the same way. So you always use/need to use the loop back device when mounting a file. Let's set up a working example: $ fallocate -l 100M volume Technically a loop device is a block device that writes to a file, rather than a piece of hardware. (Though you likely don't need to explicitly invoke the latter if you use a GUI partition manager such as GParted). The couple of useful pieces you haven't found yet are losetup -c, to make the loop driver update the size of a block device when its backing file's size changes, and partprobe, to make the kernel update its internal representation of the partitions on a device. As such, partition managers are not meant to directly resize it. Make sure you always backup your data.Ī loop device is a block device, logically analogous to a physical disk. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include +#include +#include +#include +#include +#include +#include +#include "nvmet.h" +#include "./host/nvme.The usual warning: resizing file systems and partitions may cause data loss because of software bugs, faulty hardware, power loss, human errors. See the GNU General Public License for + * more details. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. WASAPI loopback has a big advantage over stereo mix or similar inputs provided by the audio interface. The loopback input records computer playback even if your sound device lacks its own stereo mix or similar input. + * + * This program is free software you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. Choose the loopback input for the computer playback device you will be listening to (for example, 'Speakers (loopback)'. +nvme-loop-y += loop.o diff -git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c Nvmet-y += core.o configfs.o admin-cmd.o io-cmd.o +obj-$(CONFIG_NVME_TARGET_LOOP) += nvme-loop.o diff -git a/drivers/nvme/target/Makefile b/drivers/nvme/target/Makefile index 9c236e4.21e9134 100644 - a/drivers/nvme/target/Makefile +++ b/drivers/nvme/target/Makefile -1,4 +1,6 += nvmet.o + +config NVME_TARGET_LOOP + tristate "NVMe loopback device support" + depends on BLK_DEV_NVME + select NVME_TARGET + help + This enabled the NVMe loopback device support, which can be useful + to test NVMe host and target side features. X-Spam-Checker-Version: SpamAssassin 3.3.1 () on ĭiff -git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig index 9a3d742.1bf92db 100644 - a/drivers/nvme/target/Kconfig +++ b/drivers/nvme/target/Kconfig -2,3 +2,13 NVME_TARGET UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Mailing-List: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, X-SRS-Rewrite: SMTP reverse-path rewritten from by To: nvme-loop: add a NVMe loopback device Received: from (helo=localhost)īy with esmtpsa (Exim 4.80.1 #2 (Red Hat Received: from (:49266 "EHLOī" rhost-flags-OK-OK-OK-OK) by Received: from ( )īy (Postfix) with ESMTP id 95A1C20694 Received: from (localhost )īy (Postfix) with ESMTP id D1F2E20674 X-Original-To: from ( )īy (Postfix) with ESMTP id 9CD929F36A
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