From patchwork Mon Jun 13 15:53:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Shtepa X-Patchwork-Id: 12879951 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C467C433EF for ; Mon, 13 Jun 2022 18:57:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239137AbiFMS5W (ORCPT ); Mon, 13 Jun 2022 14:57:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343922AbiFMSxG (ORCPT ); Mon, 13 Jun 2022 14:53:06 -0400 Received: from mx2.veeam.com (mx2.veeam.com [64.129.123.6]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2B30F5059; Mon, 13 Jun 2022 08:55:21 -0700 (PDT) Received: from mail.veeam.com (prgmbx01.amust.local [172.24.128.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx2.veeam.com (Postfix) with ESMTPS id 9C18843023; Mon, 13 Jun 2022 11:55:17 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=veeam.com; s=mx2-2022; t=1655135717; bh=6Cwo/SxoNVP3OE3qPkaFglLUcEDMuSRtn+M7BoPqfwI=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=GrUDrOH6sXXEnPaB2INMtSUDWP9te2/XtEi3880mLTgB0PbuY8nUgNkk9tuIx610D PvYZWDAWnl1iSLdv8ypNOtpyZ0PZb/aLRa8PZcpPjEfhVwDZjdQo93g5mXwLsvh3/+ VsrN267XXkCYOplMy9dh3pU7Hspq1YCVjs7ZMDLV51ezupbrUX5+dg+lfhYp/5RC1D Wjvv5s/Pib51Q2UXrMg+0sNXHF8eRavyN80qSlnf41c5fPX7ZwOdirBTGbzsj15nuy 6DEbWq4NOHvPew2nv7vXUq/jQFt1udYONqqK2mjV+1lRo399h24QNAMM1wo3dA9DWR MiY/UyLJUihKw== Received: from prgdevlinuxpatch01.amust.local (172.24.14.5) by prgmbx01.amust.local (172.24.128.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.9; Mon, 13 Jun 2022 17:54:57 +0200 From: Sergei Shtepa To: , , CC: Sergei Shtepa Subject: [PATCH 18/20] block, blksnap: Kconfig Date: Mon, 13 Jun 2022 18:53:11 +0300 Message-ID: <1655135593-1900-19-git-send-email-sergei.shtepa@veeam.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1655135593-1900-1-git-send-email-sergei.shtepa@veeam.com> References: <1655135593-1900-1-git-send-email-sergei.shtepa@veeam.com> MIME-Version: 1.0 X-Originating-IP: [172.24.14.5] X-ClientProxiedBy: prgmbx01.amust.local (172.24.128.102) To prgmbx01.amust.local (172.24.128.102) X-EsetResult: clean, is OK X-EsetId: 37303A29D2A50A536D7766 X-Veeam-MMEX: True Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org The module configuration file allows you to set default values for module parameters. Signed-off-by: Sergei Shtepa --- drivers/block/blksnap/Kconfig | 101 ++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 drivers/block/blksnap/Kconfig diff --git a/drivers/block/blksnap/Kconfig b/drivers/block/blksnap/Kconfig new file mode 100644 index 000000000000..8588a89e30ad --- /dev/null +++ b/drivers/block/blksnap/Kconfig @@ -0,0 +1,101 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# block io layer filter module configuration +# +# + +config BLK_SNAP + tristate "Block device snapshot and change tracker module" + depends on BLK_FILTER + help + Allow to create snapshots and track block changes for a block + devices. Designed for creating backups for any block devices + (without device mapper). Snapshots are temporary and are released + then backup is completed. Change block tracking allows you to + create incremental or differential backups. + +config BLK_SNAP_TRACKING_BLOCK_MINIMUM_SHIFT + depends on BLK_SNAP + int "The power of 2 for minimum trackings block size" + default 16 + help + The minimum tracking block size by default is 64 KB (shift 16) + It's looks good for block device 128 GB or lower. + In this case, the block device is divided into 2097152 blocks. + +config BLK_SNAP_TRACKING_BLOCK_MAXIMUM_COUNT + depends on BLK_SNAP + int "The limit of the maximum number of trackings blocks" + default 2097152 + help + As the size of the block device grows, the size of the tracking block + size should also grow. For this purpose, the limit of the maximum + number of block size is set. + +config BLK_SNAP_CHUNK_MINIMUM_SHIFT + depends on BLK_SNAP + int "The power of 2 for minimum snapshots chunk size" + default 18 + help + The minimum chunk size by default is 256 KB (shift 18) + It's looks good for block device 128 GB or lower. + In this case, the block device is divided into 524288 chunks. + +config BLK_SNAP_CHUNK_MAXIMUM_COUNT + depends on BLK_SNAP + int "The limit of the maximum number of snapshots chunks" + default 2097152 + help + As the size of the block device grows, the size of the chunk + should also grow. For this purpose, the limit of the maximum number + of chunks is set. + +config BLK_SNAP_CHUNK_MAXIMUM_IN_CACHE + depends on BLK_SNAP + int "The limit of the maximum chunks in memory cache" + default 64 + help + Since reading and writing to snapshots is performed in large chunks, + a cache is implemented to optimize reading small portions of data + from the snapshot image. As the number of chunks in the cache + increases, memory consumption also increases. + The minimum recommended value is four. + +config BLK_SNAP_FREE_DIFF_BUFFER_POOL_SIZE + depends on BLK_SNAP + int "The maximum size of the free buffers pool" + default 128 + help + A buffer can be allocated for each chunk. After use, this buffer is + not released immediately, but is sent to the pool of free buffers. + However, if there are too many free buffers in the pool, they are + released immediately. The maximum size of the pool is regulated by + this define. + +config BLK_SNAP_DIFF_STORAGE_MINIMUM + depends on BLK_SNAP + int "The minimum allowable size of the difference storage in sectors" + default 2097152 + help + When reached, an event is generated about the lack of free space. + +config BLK_SNAP_DEBUG_MEMORY_LEAK + depends on BLK_SNAP + bool "Enable memory leak detector" + default n + help + Enables debugging code to monitor memory consumption by the module. + + If unsure, say N. + +config BLK_SNAP_ALLOW_DIFF_STORAGE_IN_MEMORY + depends on BLK_SNAP + bool "Allow difference storage in memory" + default n + help + Enables the ability to create a repository of changes in memory. + This feature can be useful for debugging. Or it can be used for + mobile phones or other devices if there are guaranteed not to be + a large number of writings during the snapshot hold. + + If unsure, say N.