From patchwork Tue Jun 15 09:17:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 12320831 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=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 2872EC49EA3 for ; Tue, 15 Jun 2021 09:18:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14A6C6142E for ; Tue, 15 Jun 2021 09:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231356AbhFOJUW (ORCPT ); Tue, 15 Jun 2021 05:20:22 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:54346 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230454AbhFOJUU (ORCPT ); Tue, 15 Jun 2021 05:20:20 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 0514321989; Tue, 15 Jun 2021 09:18:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623748695; 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=0XkV+RgC+fT2zb/9P8XJncXzoes6c7BbAf1UfyHkV6A=; b=0e1HG1zyf9r0J2dNWokgc+OQ6H0UXR3iSbtdwrp9wm/bE28mhz4Fb/S8UqOpeYqRtSdOQu cjzSydpXdO1I2vHzYya5mJAaN//RyXzr/7zzUn4xfaMsXEldyCft0OEcFgoH8uBWNaf9EV K6ZVvlNwJx3pxSvhG+7r7Tc+dgN3eSM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623748695; 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=0XkV+RgC+fT2zb/9P8XJncXzoes6c7BbAf1UfyHkV6A=; b=uT6drJDEI8MJfUI/sGn0NhkaG98lb5Jbe1P+6dH/SBVNuTJJgwgIMJ3LZV0NLinp+sR++m YCE36wZaDGigUuDw== Received: from quack2.suse.cz (unknown [10.100.200.198]) by relay2.suse.de (Postfix) with ESMTP id 64B4CA3B95; Tue, 15 Jun 2021 09:18:14 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 3153F1F2CBC; Tue, 15 Jun 2021 11:18:14 +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 , "Darrick J . Wong" Subject: [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Date: Tue, 15 Jun 2021 11:17:54 +0200 Message-Id: <20210615091814.28626-4-jack@suse.cz> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210615090844.6045-1-jack@suse.cz> References: <20210615090844.6045-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2666; h=from:subject; bh=oUYTBj0usYKZHAhcL7fto1zqDGKiVZb74yqc2jI2vTI=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBgyHBDjHixD9ynk7cHWEaRc2rAtNglfOdu6LFrLdwd AgRldvWJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCYMhwQwAKCRCcnaoHP2RA2dx8B/ 4gR5b8Yria4/uQruq+8EWovN0cccZVV1BF92wjDcg5rTaSr5GwLxoWGNa1zmJPwwQ2NRH2fz9jBbWX XTLnwG6OSvOA0TXxy9HTK9HZV6SHDFXUW3yhJ22X9hfGvy8bJz0s8f1eW8xywNms/Nly/xRu5UrXBT GyDDHranBIdveS/GDQ6BdURWmvKQyXthCrw1Wzl56+seW+PZeDN12hTUHRuojD2IaCIEoViNboFWcx jP6JhEYnZi/9K03+kpC2TWCBzY9VNPll6r5dkv4DCQIYTcVCyUPzhAmY4ETc89VR+5lWLjW0AVtXsz vAlFo8n+VuIi4W+AICrWJ+aOTHxfPV X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-cifs@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 Signed-off-by: Jan Kara Reviewed-by: Christoph Hellwig --- 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