From 98719051e75ccf9eca18bd2b569de4ea637b4479 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Wed, 1 Aug 2018 07:20:29 -0700 Subject: xfs: refactor internal dfops initialization The current transaction allocation code conditionally initializes the ->t_dfops indirection pointer. Transaction commit/cancel check the validity of the pointer to determine whether to finish/cancel the internal dfops. This disallows the ability to use the internal dfops list as a temporary container (via xfs_trans_alloc_empty()). Refactor transaction allocation to always initialize ->t_dfops and check permanent reservation state on transaction commit/cancel. Signed-off-by: Brian Foster Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_trans.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) (limited to 'fs/xfs') diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index 7bf5c1202719..12b6ad1558e6 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -281,13 +281,7 @@ xfs_trans_alloc( INIT_LIST_HEAD(&tp->t_items); INIT_LIST_HEAD(&tp->t_busy); tp->t_firstblock = NULLFSBLOCK; - /* - * We only roll transactions with permanent log reservation. Don't init - * ->t_dfops to skip attempts to finish or cancel an empty dfops with a - * non-permanent res. - */ - if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) - xfs_defer_init(tp, &tp->t_dfops_internal); + xfs_defer_init(tp, &tp->t_dfops_internal); error = xfs_trans_reserve(tp, resp, blocks, rtextents); if (error) { @@ -931,8 +925,13 @@ __xfs_trans_commit( trace_xfs_trans_commit(tp, _RET_IP_); - /* finish deferred items on final commit */ - if (!regrant && tp->t_dfops) { + /* + * Finish deferred items on final commit. Only permanent transactions + * should ever have deferred ops. + */ + WARN_ON_ONCE(xfs_defer_has_unfinished_work(tp->t_dfops) && + !(tp->t_flags & XFS_TRANS_PERM_LOG_RES)); + if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) { error = xfs_defer_finish_noroll(&tp); if (error) { xfs_defer_cancel(tp); @@ -1029,7 +1028,7 @@ xfs_trans_cancel( trace_xfs_trans_cancel(tp, _RET_IP_); - if (tp->t_dfops) + if (tp->t_flags & XFS_TRANS_PERM_LOG_RES) xfs_defer_cancel(tp); /* -- cgit v1.2.3-59-g8ed1b