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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 A01FFC4708F for ; Wed, 2 Jun 2021 02:15:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8EBD1613D0 for ; Wed, 2 Jun 2021 02:15:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230060AbhFBCRX (ORCPT ); Tue, 1 Jun 2021 22:17:23 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:38988 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229740AbhFBCRV (ORCPT ); Tue, 1 Jun 2021 22:17:21 -0400 Received: from relay2.suse.de (unknown [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id EAD282194F for ; Wed, 2 Jun 2021 02:15:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1622600137; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=M+Yr5Rg3NFC4PMkIMWE4eKwN8f7i5jaEoNVhYIuvcGk=; b=lVX74x4cV/YsaREDRNn6q8YUPSPWf2U97qqyEkHtFSqcqkBiCPRk4xs5TEr6zsWWMp0e4h ZXf6MyctYW0yPnFS3txigjGLuu0MFhQ71tL8mhEkV+h0Rqf0pcYYjB5g+ZmKaDpPOfEGUp ejuhEKTedGMB3FgQlOTYFkdeiwnGcQY= Received: from adam-pc.lan (unknown [10.163.16.38]) by relay2.suse.de (Postfix) with ESMTP id EA344A3B84 for ; Wed, 2 Jun 2021 02:15:36 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v2 03/10] btrfs: defrag: replace hard coded PAGE_SIZE to sectorsize for defrag_lookup_extent() Date: Wed, 2 Jun 2021 10:15:21 +0800 Message-Id: <20210602021528.68617-4-wqu@suse.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210602021528.68617-1-wqu@suse.com> References: <20210602021528.68617-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org When testing subpage defrag support, I always find some strange inode nbytes error, after a lot of debugging, it turns out that defrag_lookup_extent() is using PAGE_SIZE as size for lookup_extent_mapping(). Since lookup_extent_mapping() is calling __lookup_extent_mapping() with @strict == 1, this means any extent map smaller than one page will be ignored, prevent subpage defrag to grab a correct extent map. There are quite some PAGE_SIZE usage in ioctl.c, but most of them are correct usages, and can be one of the following cases: - ioctl structure size check We want ioctl structure be contained inside one page. - real page opeartions There is one special case left untouched, check_defrag_in_cache(). This function will later be removed completely, thus there is not much meaning to change it now. Signed-off-by: Qu Wenruo --- fs/btrfs/ioctl.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 0b5a48274266..24b0dc1325d3 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1037,23 +1037,24 @@ static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; struct extent_map *em; - u64 len = PAGE_SIZE; + const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; /* * hopefully we have this extent in the tree already, try without * the full extent lock */ read_lock(&em_tree->lock); - em = lookup_extent_mapping(em_tree, start, len); + em = lookup_extent_mapping(em_tree, start, sectorsize); read_unlock(&em_tree->lock); if (!em) { struct extent_state *cached = NULL; - u64 end = start + len - 1; + u64 end = start + sectorsize - 1; /* get the big lock and read metadata off disk */ lock_extent_bits(io_tree, start, end, &cached); - em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); + em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, + sectorsize); unlock_extent_cached(io_tree, start, end, &cached); if (IS_ERR(em)) -- 2.31.1