From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q95HIL4W071606 for ; Fri, 5 Oct 2012 12:18:21 -0500 Message-Id: <20121005171945.678198252@sgi.com> Date: Fri, 05 Oct 2012 12:18:56 -0500 From: Ben Myers Subject: [patch v4 03/13] [PATCH 03/13] xfs: dont run the sync work if the filesystem is References: <20121005171853.985930109@sgi.com> Content-Disposition: inline; filename=xfs-don-t-run-the-sync-work-if-the-filesystem-is.patch read-only List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Dave Chinner , xfs@oss.sgi.com Cc: Dave Chinner From: Dave Chinner If the filesystem is mounted or remounted read-only, stop the sync worker that tries to flush or cover the log if the filesystem is dirty. It's read-only, so it isn't dirty. Restart it on a remount,rw as necessary. This avoids the need for RO checks in the work. Similarly, stop the sync work when the filesystem is frozen, and start it again when the filesysetm is thawed. This avoids the need for special freeze checks in the work. Signed-off-by: Dave Chinner Reviewed-by: Mark Tinguely Reviewed-by: Christoph Hellwig Signed-off-by: Ben Myers --- fs/xfs/xfs_super.c | 2 ++ fs/xfs/xfs_sync.c | 29 ++++++++++++++++------------- 2 files changed, 18 insertions(+), 13 deletions(-) diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 935b2c7..f6147ae 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1107,6 +1107,7 @@ xfs_fs_remount( * value if it is non-zero, otherwise go with the default. */ xfs_restore_resvblks(mp); + xfs_syncd_queue_sync(mp); } /* rw -> ro */ @@ -1152,6 +1153,7 @@ xfs_fs_unfreeze( struct xfs_mount *mp = XFS_M(sb); xfs_restore_resvblks(mp); + xfs_syncd_queue_sync(mp); return 0; } diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c index 509190f..5d69f23 100644 --- a/fs/xfs/xfs_sync.c +++ b/fs/xfs/xfs_sync.c @@ -323,6 +323,9 @@ xfs_quiesce_data( * Second stage of a quiesce. The data is already synced, now we have to take * care of the metadata. New transactions are already blocked, so we need to * wait for any remaining transactions to drain out before proceeding. + * + * Note: this stops background sync work - the callers must ensure it is started + * again when appropriate. */ void xfs_quiesce_attr( @@ -341,6 +344,9 @@ xfs_quiesce_attr( /* flush all pending changes from the AIL */ xfs_ail_push_all_sync(mp->m_ail); + /* stop background sync work */ + cancel_delayed_work_sync(&mp->m_sync_work); + /* * Just warn here till VFS can correctly support * read-only remount without racing. @@ -379,9 +385,8 @@ xfs_syncd_queue_sync( } /* - * Every sync period we need to unpin all items in the AIL and push them to - * disk. If there is nothing dirty, then we might need to cover the log to - * indicate that the filesystem is idle and not frozen. + * Every sync period we need to push dirty metadata and try to cover the log + * to indicate the filesystem is idle and not frozen. */ void xfs_sync_worker( @@ -391,17 +396,15 @@ xfs_sync_worker( struct xfs_mount, m_sync_work); int error; - if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { - /* dgc: errors ignored here */ - if (mp->m_super->s_writers.frozen == SB_UNFROZEN && - xfs_log_need_covered(mp)) - error = xfs_fs_log_dummy(mp); - else - xfs_log_force(mp, 0); + /* dgc: errors ignored here */ + if (mp->m_super->s_writers.frozen == SB_UNFROZEN && + xfs_log_need_covered(mp)) + error = xfs_fs_log_dummy(mp); + else + xfs_log_force(mp, 0); - /* start pushing all the metadata that is currently dirty */ - xfs_ail_push_all(mp->m_ail); - } + /* start pushing all the metadata that is currently dirty */ + xfs_ail_push_all(mp->m_ail); /* queue us up again */ xfs_syncd_queue_sync(mp); -- 1.7.10 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs