From patchwork Mon Jun 7 14:52:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 12303747 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 19839C48BE6 for ; Mon, 7 Jun 2021 14:52:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0975F60FE5 for ; Mon, 7 Jun 2021 14:52:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231217AbhFGOyd (ORCPT ); Mon, 7 Jun 2021 10:54:33 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:34624 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230264AbhFGOya (ORCPT ); Mon, 7 Jun 2021 10:54:30 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 819DE21A68; Mon, 7 Jun 2021 14:52:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623077557; 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=vhH8fZvd6Tom4nBiYNHBFCVmcJF6aY93XCBQD2IK7mE=; b=sTYyrBrhmcoYH4Pc6qGpefCJy5Sux5PJVReKTeUz6gUVd74lV8PShJvlmgXRUYi7K78zGY d4J3ry2lEKY4SEj8ooKRSfsxNwMcXt1Hj4nLWK6IcMLWMM+R6InO8T8IFySZfCpG7xy0Kk TEFjqGOekbxuEn9tycM3YhzJbNJncoU= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623077557; 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=vhH8fZvd6Tom4nBiYNHBFCVmcJF6aY93XCBQD2IK7mE=; b=DwFAqfCR7Wr+2ACyXhre2GSoLv5DOgFn+ENsakIV7+3dRNt9fpuZ6AfKNeT4x7NlOGqZpl fOCS0M97+XnF36Bg== Received: from quack2.suse.cz (unknown [10.100.200.198]) by relay2.suse.de (Postfix) with ESMTP id B8DC1A3B98; Mon, 7 Jun 2021 14:52:36 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 91DF31F2CB3; Mon, 7 Jun 2021 16:52:36 +0200 (CEST) From: Jan Kara To: Cc: Christoph Hellwig , Dave Chinner , ceph-devel@vger.kernel.org, Chao Yu , Damien Le Moal , "Darrick J. Wong" , Jaegeuk Kim , Jeff Layton , Johannes Thumshirn , linux-cifs@vger.kernel.org, , linux-f2fs-devel@lists.sourceforge.net, , , Miklos Szeredi , Steve French , Ted Tso , Matthew Wilcox , Jan Kara Subject: [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Date: Mon, 7 Jun 2021 16:52:14 +0200 Message-Id: <20210607145236.31852-4-jack@suse.cz> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210607144631.8717-1-jack@suse.cz> References: <20210607144631.8717-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2616; h=from:subject; bh=feuIxLKoHMpqfTsHSNzx+Llrxfh/M4pQHEj3mln4fkU=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBgvjKf4qNEt/Jyz8s3OnJ3hXcO5MHT6Xe5BiU0vi7v Yg+bSvWJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCYL4ynwAKCRCcnaoHP2RA2chHB/ wKYys4WnIBaTn+iTmcDwD76cwJNj9fNUmSIB5g6n0gtAP4/BnjWvcBbmQla0RGUYJvtO/9VQX1/DPE RdysgXZVUQqMFjHYjWjBwkkpPWcvdHvIW+9KXp0iJzLJkqUV8p8ZfByoP2JTRzDN82Rte87GtnN2Sp L0xIljcsn5jrH8Ww2o3Twm5GXBaCRdS8AVgRk1xEBgsw9Tm6VEqipm87uxNWlHgaU4THjuXQviA32K qTmxhDoIUFvd+7DyJIQyVFx8U2bwkAdQVm20zTZnZAZepHKSgapRODGbx6Yqk1g6ob+l9hmvzMz/zA Y3rmXXMf7ydvJe7qAvc8CkddqajivD 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. Signed-off-by: Jan Kara Reviewed-by: Darrick J. Wong --- 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 d8afbc9661d7..ddc11bafc183 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 c8e7e451d81e..b8e9bccecd9f 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