From patchwork Thu Jul 15 13:40:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 478460 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, USER_AGENT_GIT autolearn=unavailable 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 C4C4FC49ECE for ; Thu, 15 Jul 2021 13:40:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A686D613C9 for ; Thu, 15 Jul 2021 13:40:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237899AbhGONni (ORCPT ); Thu, 15 Jul 2021 09:43:38 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:55660 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232802AbhGONn1 (ORCPT ); Thu, 15 Jul 2021 09:43:27 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 4DBA02282A; Thu, 15 Jul 2021 13:40:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1626356433; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dSJNYi2EjK6WpJlFRpe2IuMqHuUJYHQH+NO2vWgyFGg=; b=r7uAzkh/LSvTU+XWBd733PveaP53L/sk18I7vRhYd0S3xmB5TuJ7AZ0Fekgj5SXJ0B5SfA SJA48ivXLVn5yZKZswQfFOQhR4tLyJ7O5926UjHyDGdIe4/D7UjmMQZLQiEB29PRfktlfw PE4sXqT7AQoC5t17VGOWnzH6vWLrqgE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1626356433; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dSJNYi2EjK6WpJlFRpe2IuMqHuUJYHQH+NO2vWgyFGg=; b=cDdhW4+KKzF+Hly8A0dgozw6g2hc8xSeDQqt2K48qawD+fjxhXSZXfVot5JUTMlbo9xzjr 2oxXXVUmB7i3sNCA== Received: from quack2.suse.cz (unknown [10.100.200.198]) by relay2.suse.de (Postfix) with ESMTP id 3B7ECA3B9A; Thu, 15 Jul 2021 13:40:33 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 0E4B81E0BFC; Thu, 15 Jul 2021 15:40:33 +0200 (CEST) From: Jan Kara To: Cc: , Christoph Hellwig , "Darrick J. Wong" , Ted Tso , Dave Chinner , Matthew Wilcox , , , linux-f2fs-devel@lists.sourceforge.net, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, Jan Kara , Christoph Hellwig Subject: [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Date: Thu, 15 Jul 2021 15:40:14 +0200 Message-Id: <20210715134032.24868-4-jack@suse.cz> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210715133202.5975-1-jack@suse.cz> References: <20210715133202.5975-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2711; h=from:subject; bh=pxG959YMz3LFOsl9BwK2LiP5YusDSYP7NTB6LUXCXkw=; b=owGbwMvMwME4Z+4qdvsUh5uMp9WSGBI+WO1nr+VnNVrxSG3uY7dEM6/6t3IXn6V6e1TJxjHcVdwm E8fZyWjMwsDIwSArpsiyOvKi9rV5Rl1bQzVkYAaxMoFMYeDiFICJlNZxMFy6VmzM/LIjtM65/7Wl4b fi+SYx4r+0rZmVOtIFYrhKml46Wr+TFtLf/MHog7Sp3I+jMoqyP+RN1kVacecHm53mbV78fcLPXfaV XaHmrTuP2yjsEopNTFHfvONLh+T0OQ455ef5W786HWLv8vzqlxeeZNJ55rfPt46uTbXMr66H15RPOa a/xVm24emjcI9brZ8TH327/uZhzbWrDtlTitlYvFzkNFgCj118LTfjWs3ymIR/8c/EahwzfzhL/Zr8 V9/i9eKEJ3u7a/SDT6nPabqZnMvBzNN9uTDhRe2hqHM/nLbZr9GLKi99w5N1/u+bvyn/Epot7z6brT 1VX/HkveR/KqlGh09zxH49u3sSAA== X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Some operations such as reflinking blocks among files will need to lock invalidate_lock for two mappings. Add helper functions to do that. Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Signed-off-by: Jan Kara --- include/linux/fs.h | 6 ++++++ mm/filemap.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index 90a80de37ad4..894ff2451793 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -849,6 +849,12 @@ static inline void filemap_invalidate_unlock_shared( void lock_two_nondirectories(struct inode *, struct inode*); void unlock_two_nondirectories(struct inode *, struct inode*); +void filemap_invalidate_lock_two(struct address_space *mapping1, + struct address_space *mapping2); +void filemap_invalidate_unlock_two(struct address_space *mapping1, + struct address_space *mapping2); + + /* * NOTE: in a 32bit arch with a preemptable kernel and * an UP compile the i_size_read/write must be atomic diff --git a/mm/filemap.c b/mm/filemap.c index f7f9b87d2cd0..0fad08331cf4 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1009,6 +1009,44 @@ struct page *__page_cache_alloc(gfp_t gfp) EXPORT_SYMBOL(__page_cache_alloc); #endif +/* + * filemap_invalidate_lock_two - lock invalidate_lock for two mappings + * + * Lock exclusively invalidate_lock of any passed mapping that is not NULL. + * + * @mapping1: the first mapping to lock + * @mapping2: the second mapping to lock + */ +void filemap_invalidate_lock_two(struct address_space *mapping1, + struct address_space *mapping2) +{ + if (mapping1 > mapping2) + swap(mapping1, mapping2); + if (mapping1) + down_write(&mapping1->invalidate_lock); + if (mapping2 && mapping1 != mapping2) + down_write_nested(&mapping2->invalidate_lock, 1); +} +EXPORT_SYMBOL(filemap_invalidate_lock_two); + +/* + * filemap_invalidate_unlock_two - unlock invalidate_lock for two mappings + * + * Unlock exclusive invalidate_lock of any passed mapping that is not NULL. + * + * @mapping1: the first mapping to unlock + * @mapping2: the second mapping to unlock + */ +void filemap_invalidate_unlock_two(struct address_space *mapping1, + struct address_space *mapping2) +{ + if (mapping1) + up_write(&mapping1->invalidate_lock); + if (mapping2 && mapping1 != mapping2) + up_write(&mapping2->invalidate_lock); +} +EXPORT_SYMBOL(filemap_invalidate_unlock_two); + /* * In order to wait for pages to become available there must be * waitqueues associated with pages. By using a hash table of