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xfs: refactor internal dfops initialization

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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 <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2018-08-01 07:20:29 -07:00 committed by Darrick J. Wong
parent 56830d6cc1
commit 98719051e7
1 changed files with 9 additions and 10 deletions
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19
fs/xfs/xfs_trans.c
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@ -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);
/*