From patchwork Tue Jan 24 19:30:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13114642 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8A41C54EB4 for ; Tue, 24 Jan 2023 19:30:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232744AbjAXTak (ORCPT ); Tue, 24 Jan 2023 14:30:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233798AbjAXTah (ORCPT ); Tue, 24 Jan 2023 14:30:37 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C8874DBDB; Tue, 24 Jan 2023 11:30:34 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C8FC8B816AC; Tue, 24 Jan 2023 19:30:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 922E9C433D2; Tue, 24 Jan 2023 19:30:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674588631; bh=yV3t1oc2mIc6UQl4grQoFozaSbqgHuC2qyMyJ9ivPAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QKajcuifCAg51Up9S3ifMhx72LK+AgoAV1YWzhuUijPZWXHqy0T8ENQ2itgt9RkEO 7LZbHaiO8ClQPdfCMbRtDTbnKiSO4ymH9SiL0+eFtpUtb4pIosuTDRRbUTDj01/EAs o92msCtTjV65+0+JvCMiva9v0C+gYzd64TbM1j10bjcq8f7IIRVw2+KfW02vvep2CU xST6f0H4ZeqxKPQWfYtDfBp995d963U1si+A+CTLF2qDxiTQvDA1NTVBBfosbltpHb z/tSIbhJauoc5gE/0a2Olb3rmDz2IIaJ2ubfRHX9JX8+Dr+eVkJMNHYFdHKrWLwUiM fq/i9WVj+ry2A== From: Jeff Layton To: tytso@mit.edu, adilger.kernel@dilger.ca, djwong@kernel.org, david@fromorbit.com, trondmy@hammerspace.com, neilb@suse.de, viro@zeniv.linux.org.uk, zohar@linux.ibm.com, xiubli@redhat.com, chuck.lever@oracle.com, lczerner@redhat.com, jack@suse.cz, bfields@fieldses.org, brauner@kernel.org, fweimer@redhat.com Cc: linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, linux-xfs@vger.kernel.org Subject: [PATCH v8 RESEND 1/8] fs: uninline inode_query_iversion Date: Tue, 24 Jan 2023 14:30:18 -0500 Message-Id: <20230124193025.185781-2-jlayton@kernel.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230124193025.185781-1-jlayton@kernel.org> References: <20230124193025.185781-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Reviewed-by: NeilBrown Signed-off-by: Jeff Layton Reviewed-by: Jan Kara Reviewed-by: Christian Brauner --- fs/libfs.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/iversion.h | 38 ++------------------------------------ 2 files changed, 38 insertions(+), 36 deletions(-) diff --git a/fs/libfs.c b/fs/libfs.c index aada4e7c8713..17ecc47696e1 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1582,3 +1582,39 @@ bool inode_maybe_inc_iversion(struct inode *inode, bool force) return true; } EXPORT_SYMBOL(inode_maybe_inc_iversion); + +/** + * inode_query_iversion - read i_version for later use + * @inode: inode from which i_version should be read + * + * Read the inode i_version counter. This should be used by callers that wish + * to store the returned i_version for later comparison. This will guarantee + * that a later query of the i_version will result in a different value if + * anything has changed. + * + * In this implementation, we fetch the current value, set the QUERIED flag and + * then try to swap it into place with a cmpxchg, if it wasn't already set. If + * that fails, we try again with the newly fetched value from the cmpxchg. + */ +u64 inode_query_iversion(struct inode *inode) +{ + u64 cur, new; + + cur = inode_peek_iversion_raw(inode); + do { + /* If flag is already set, then no need to swap */ + if (cur & I_VERSION_QUERIED) { + /* + * This barrier (and the implicit barrier in the + * cmpxchg below) pairs with the barrier in + * inode_maybe_inc_iversion(). + */ + smp_mb(); + break; + } + + new = cur | I_VERSION_QUERIED; + } while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new)); + return cur >> I_VERSION_QUERIED_SHIFT; +} +EXPORT_SYMBOL(inode_query_iversion); diff --git a/include/linux/iversion.h b/include/linux/iversion.h index e27bd4f55d84..6755d8b4f20b 100644 --- a/include/linux/iversion.h +++ b/include/linux/iversion.h @@ -234,42 +234,6 @@ inode_peek_iversion(const struct inode *inode) return inode_peek_iversion_raw(inode) >> I_VERSION_QUERIED_SHIFT; } -/** - * inode_query_iversion - read i_version for later use - * @inode: inode from which i_version should be read - * - * Read the inode i_version counter. This should be used by callers that wish - * to store the returned i_version for later comparison. This will guarantee - * that a later query of the i_version will result in a different value if - * anything has changed. - * - * In this implementation, we fetch the current value, set the QUERIED flag and - * then try to swap it into place with a cmpxchg, if it wasn't already set. If - * that fails, we try again with the newly fetched value from the cmpxchg. - */ -static inline u64 -inode_query_iversion(struct inode *inode) -{ - u64 cur, new; - - cur = inode_peek_iversion_raw(inode); - do { - /* If flag is already set, then no need to swap */ - if (cur & I_VERSION_QUERIED) { - /* - * This barrier (and the implicit barrier in the - * cmpxchg below) pairs with the barrier in - * inode_maybe_inc_iversion(). - */ - smp_mb(); - break; - } - - new = cur | I_VERSION_QUERIED; - } while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new)); - return cur >> I_VERSION_QUERIED_SHIFT; -} - /* * For filesystems without any sort of change attribute, the best we can * do is fake one up from the ctime: @@ -283,6 +247,8 @@ static inline u64 time_to_chattr(struct timespec64 *t) return chattr; } +u64 inode_query_iversion(struct inode *inode); + /** * inode_eq_iversion_raw - check whether the raw i_version counter has changed * @inode: inode to check