From patchwork Thu Jul 7 23:43:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Chinner X-Patchwork-Id: 12910395 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 B7DE0CCA485 for ; Thu, 7 Jul 2022 23:43:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236965AbiGGXn5 (ORCPT ); Thu, 7 Jul 2022 19:43:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236967AbiGGXnz (ORCPT ); Thu, 7 Jul 2022 19:43:55 -0400 Received: from mail105.syd.optusnet.com.au (mail105.syd.optusnet.com.au [211.29.132.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 10C446D547 for ; Thu, 7 Jul 2022 16:43:54 -0700 (PDT) Received: from dread.disaster.area (pa49-181-2-147.pa.nsw.optusnet.com.au [49.181.2.147]) by mail105.syd.optusnet.com.au (Postfix) with ESMTPS id F356D10E7CDD for ; Fri, 8 Jul 2022 09:43:49 +1000 (AEST) Received: from discord.disaster.area ([192.168.253.110]) by dread.disaster.area with esmtp (Exim 4.92.3) (envelope-from ) id 1o9b9w-00FoQE-EH for linux-xfs@vger.kernel.org; Fri, 08 Jul 2022 09:43:48 +1000 Received: from dave by discord.disaster.area with local (Exim 4.95) (envelope-from ) id 1o9b9w-004bQ4-Co for linux-xfs@vger.kernel.org; Fri, 08 Jul 2022 09:43:48 +1000 From: Dave Chinner To: linux-xfs@vger.kernel.org Subject: [PATCH 1/9] xfs: factor the xfs_iunlink functions Date: Fri, 8 Jul 2022 09:43:37 +1000 Message-Id: <20220707234345.1097095-2-david@fromorbit.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220707234345.1097095-1-david@fromorbit.com> References: <20220707234345.1097095-1-david@fromorbit.com> MIME-Version: 1.0 X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.4 cv=e9dl9Yl/ c=1 sm=1 tr=0 ts=62c76fb6 a=ivVLWpVy4j68lT4lJFbQgw==:117 a=ivVLWpVy4j68lT4lJFbQgw==:17 a=RgO8CyIxsXoA:10 a=20KFwNOVAAAA:8 a=VwQbUJbxAAAA:8 a=cM0QFjsFstjT-tzj_kwA:9 a=AjGcO6oz07-iQ99wixmX:22 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Dave Chinner Prep work that separates the locking that protects the unlinked list from the actual operations being performed. This also helps document the fact they are performing list insert and remove operations. No functional code change. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_inode.c | 108 +++++++++++++++++++++++++++------------------ 1 file changed, 66 insertions(+), 42 deletions(-) diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 482e1ee2d669..69bca88fc8ed 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -2115,39 +2115,20 @@ xfs_iunlink_update_inode( return error; } -/* - * This is called when the inode's link count has gone to 0 or we are creating - * a tmpfile via O_TMPFILE. The inode @ip must have nlink == 0. - * - * We place the on-disk inode on a list in the AGI. It will be pulled from this - * list when the inode is freed. - */ -STATIC int -xfs_iunlink( +static int +xfs_iunlink_insert_inode( struct xfs_trans *tp, + struct xfs_perag *pag, + struct xfs_buf *agibp, struct xfs_inode *ip) { struct xfs_mount *mp = tp->t_mountp; - struct xfs_perag *pag; - struct xfs_agi *agi; - struct xfs_buf *agibp; + struct xfs_agi *agi = agibp->b_addr; xfs_agino_t next_agino; xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ip->i_ino); short bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; int error; - ASSERT(VFS_I(ip)->i_nlink == 0); - ASSERT(VFS_I(ip)->i_mode != 0); - trace_xfs_iunlink(ip); - - pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); - - /* Get the agi buffer first. It ensures lock ordering on the list. */ - error = xfs_read_agi(pag, tp, &agibp); - if (error) - goto out; - agi = agibp->b_addr; - /* * Get the index into the agi hash table for the list this inode will * go on. Make sure the pointer isn't garbage and that this inode @@ -2157,8 +2138,7 @@ xfs_iunlink( if (next_agino == agino || !xfs_verify_agino_or_null(pag, next_agino)) { xfs_buf_mark_corrupt(agibp); - error = -EFSCORRUPTED; - goto out; + return -EFSCORRUPTED; } if (next_agino != NULLAGINO) { @@ -2171,7 +2151,7 @@ xfs_iunlink( error = xfs_iunlink_update_inode(tp, ip, pag, next_agino, &old_agino); if (error) - goto out; + return error; ASSERT(old_agino == NULLAGINO); /* @@ -2180,11 +2160,42 @@ xfs_iunlink( */ error = xfs_iunlink_add_backref(pag, agino, next_agino); if (error) - goto out; + return error; } /* Point the head of the list to point to this inode. */ - error = xfs_iunlink_update_bucket(tp, pag, agibp, bucket_index, agino); + return xfs_iunlink_update_bucket(tp, pag, agibp, bucket_index, agino); +} + +/* + * This is called when the inode's link count has gone to 0 or we are creating + * a tmpfile via O_TMPFILE. The inode @ip must have nlink == 0. + * + * We place the on-disk inode on a list in the AGI. It will be pulled from this + * list when the inode is freed. + */ +STATIC int +xfs_iunlink( + struct xfs_trans *tp, + struct xfs_inode *ip) +{ + struct xfs_mount *mp = tp->t_mountp; + struct xfs_perag *pag; + struct xfs_buf *agibp; + int error; + + ASSERT(VFS_I(ip)->i_nlink == 0); + ASSERT(VFS_I(ip)->i_mode != 0); + trace_xfs_iunlink(ip); + + pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); + + /* Get the agi buffer first. It ensures lock ordering on the list. */ + error = xfs_read_agi(pag, tp, &agibp); + if (error) + goto out; + + error = xfs_iunlink_insert_inode(tp, pag, agibp, ip); out: xfs_perag_put(pag); return error; @@ -2305,18 +2316,15 @@ xfs_iunlink_map_prev( return 0; } -/* - * Pull the on-disk inode from the AGI unlinked list. - */ -STATIC int -xfs_iunlink_remove( +static int +xfs_iunlink_remove_inode( struct xfs_trans *tp, struct xfs_perag *pag, + struct xfs_buf *agibp, struct xfs_inode *ip) { struct xfs_mount *mp = tp->t_mountp; - struct xfs_agi *agi; - struct xfs_buf *agibp; + struct xfs_agi *agi = agibp->b_addr; struct xfs_buf *last_ibp; struct xfs_dinode *last_dip = NULL; xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ip->i_ino); @@ -2327,12 +2335,6 @@ xfs_iunlink_remove( trace_xfs_iunlink_remove(ip); - /* Get the agi buffer first. It ensures lock ordering on the list. */ - error = xfs_read_agi(pag, tp, &agibp); - if (error) - return error; - agi = agibp->b_addr; - /* * Get the index into the agi hash table for the list this inode will * go on. Make sure the head pointer isn't garbage. @@ -2397,6 +2399,28 @@ xfs_iunlink_remove( next_agino); } +/* + * Pull the on-disk inode from the AGI unlinked list. + */ +STATIC int +xfs_iunlink_remove( + struct xfs_trans *tp, + struct xfs_perag *pag, + struct xfs_inode *ip) +{ + struct xfs_buf *agibp; + int error; + + trace_xfs_iunlink_remove(ip); + + /* Get the agi buffer first. It ensures lock ordering on the list. */ + error = xfs_read_agi(pag, tp, &agibp); + if (error) + return error; + + return xfs_iunlink_remove_inode(tp, pag, agibp, ip); +} + /* * Look up the inode number specified and if it is not already marked XFS_ISTALE * mark it stale. We should only find clean inodes in this lookup that aren't