From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0F83C4741F for ; Thu, 5 Nov 2020 15:03:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83646206D9 for ; Thu, 5 Nov 2020 15:03:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="U03vYUzY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731147AbgKEPDx (ORCPT ); Thu, 5 Nov 2020 10:03:53 -0500 Received: from mx2.suse.de ([195.135.220.15]:41370 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730465AbgKEPDv (ORCPT ); Thu, 5 Nov 2020 10:03:51 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1604588630; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=IrthLEPJSo8wynTfkgfpXAj8luWi7qTkjOVx124cDOw=; b=U03vYUzY8uIz4gTA3f2KQE3dNq2j++e0BeG4N8C0yku9mh5kI9b8uSXUTbHMR6mjZXV8kU sAd7vzQmsnHH98888slY2PbQK+OzVkxBV60xxWOC82Ne47psRoh0s8N1rHxSdEAl2e9Hp4 1fr02TMRRXMq99YfnnzJHcQtn+VJU4k= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 13387AAF1; Thu, 5 Nov 2020 15:03:50 +0000 (UTC) Subject: Re: [PATCH 16/32] btrfs: extent_io: allow find_first_extent_bit() to find a range with exact bits match To: Qu Wenruo , linux-btrfs@vger.kernel.org References: <20201103133108.148112-1-wqu@suse.com> <20201103133108.148112-17-wqu@suse.com> From: Nikolay Borisov Autocrypt: addr=nborisov@suse.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201103133108.148112-17-wqu@suse.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 3.11.20 г. 15:30 ч., Qu Wenruo wrote: > Currently if we pass mutliple @bits to find_first_extent_bit(), it will > return the first range with one or more bits matching @bits. > > This is fine for current code, since most of them are just doing their > own extra checks, and all existing callers only call it with 1 or 2 > bits. > > But for the incoming subpage support, we want the ability to return range > with exact match, so that caller can skip some extra checks. > > So this patch will add a new bool parameter, @exact_match, to > find_first_extent_bit() and its callees. > Currently all callers just pass 'false' to the new parameter, thus no > functional change is introduced. > > Signed-off-by: Qu Wenruo What's the problem of callers doing their own checks, given every one will have different requirements? The interface should be generic enough to satisfy every user and then any specific processing should be performed by the respective user.