[PATCH 6/7] xfs: AIL should be log centric

Dave Chinner
2022-03-15T06:43:00Z

From: Dave Chinner <dchinner@redhat.com>

The AIL operates purely on log items, so it is a log centric
subsystem. Divorce it from the xfs_mount and instead have it pass
around xlog pointers.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/xfs_trans.c | 2 +-
fs/xfs/xfs_trans_ail.c | 26 +++++++++++++-------------
fs/xfs/xfs_trans_priv.h | 3 ++-
3 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index de87fb136b51..831d355c3258 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -773,7 +773,7 @@ xfs_trans_committed_bulk(
* object into the AIL as we are in a shutdown situation.
*/
if (aborted) {
- ASSERT(xfs_is_shutdown(ailp->ail_mount));
+ ASSERT(xlog_is_shutdown(ailp->ail_log));
if (lip->li_ops->iop_unpin)
lip->li_ops->iop_unpin(lip, 1);
continue;
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index 1b52952097c1..c2ccb98c7bcd 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -398,7 +398,7 @@ xfsaild_push_item(
* If log item pinning is enabled, skip the push and track the item as
* pinned. This can help induce head-behind-tail conditions.
*/
- if (XFS_TEST_ERROR(false, ailp->ail_mount, XFS_ERRTAG_LOG_ITEM_PIN))
+ if (XFS_TEST_ERROR(false, ailp->ail_log->l_mp, XFS_ERRTAG_LOG_ITEM_PIN))
return XFS_ITEM_PINNED;

/*
@@ -418,7 +418,7 @@ static long
xfsaild_push(
struct xfs_ail *ailp)
{
- xfs_mount_t *mp = ailp->ail_mount;
+ struct xfs_mount *mp = ailp->ail_log->l_mp;
struct xfs_ail_cursor cur;
struct xfs_log_item *lip;
xfs_lsn_t lsn;
@@ -443,7 +443,7 @@ xfsaild_push(
ailp->ail_log_flush = 0;

XFS_STATS_INC(mp, xs_push_ail_flush);
- xlog_cil_flush(mp->m_log);
+ xlog_cil_flush(ailp->ail_log);
}

spin_lock(&ailp->ail_lock);
@@ -632,7 +632,7 @@ xfsaild(
* opportunity to release such buffers from the queue.
*/
ASSERT(list_empty(&ailp->ail_buf_list) ||
- xfs_is_shutdown(ailp->ail_mount));
+ xlog_is_shutdown(ailp->ail_log));
xfs_buf_delwri_cancel(&ailp->ail_buf_list);
break;
}
@@ -695,7 +695,7 @@ xfs_ail_push(
struct xfs_log_item *lip;

lip = xfs_ail_min(ailp);
- if (!lip || xfs_is_shutdown(ailp->ail_mount) ||
+ if (!lip || xlog_is_shutdown(ailp->ail_log) ||
XFS_LSN_CMP(threshold_lsn, ailp->ail_target) <= 0)
return;

@@ -751,7 +751,7 @@ xfs_ail_update_finish(
struct xfs_ail *ailp,
xfs_lsn_t old_lsn) __releases(ailp->ail_lock)
{
- struct xfs_mount *mp = ailp->ail_mount;
+ struct xlog *log = ailp->ail_log;

/* if the tail lsn hasn't changed, don't do updates or wakeups. */
if (!old_lsn || old_lsn == __xfs_ail_min_lsn(ailp)) {
@@ -759,13 +759,13 @@ xfs_ail_update_finish(
return;
}

- if (!xfs_is_shutdown(mp))
- xlog_assign_tail_lsn_locked(mp);
+ if (!xlog_is_shutdown(log))
+ xlog_assign_tail_lsn_locked(log->l_mp);

if (list_empty(&ailp->ail_head))
wake_up_all(&ailp->ail_empty);
spin_unlock(&ailp->ail_lock);
- xfs_log_space_wake(mp);
+ xfs_log_space_wake(log->l_mp);
}

/*
@@ -873,13 +873,13 @@ xfs_trans_ail_delete(
int shutdown_type)
{
struct xfs_ail *ailp = lip->li_ailp;
- struct xfs_mount *mp = ailp->ail_mount;
+ struct xfs_mount *mp = ailp->ail_log->l_mp;
xfs_lsn_t tail_lsn;

spin_lock(&ailp->ail_lock);
if (!test_bit(XFS_LI_IN_AIL, &lip->li_flags)) {
spin_unlock(&ailp->ail_lock);
- if (shutdown_type && !xfs_is_shutdown(mp)) {
+ if (shutdown_type && !xlog_is_shutdown(ailp->ail_log)) {
xfs_alert_tag(mp, XFS_PTAG_AILDELETE,
"%s: attempting to delete a log item that is not in the AIL",
__func__);
@@ -904,7 +904,7 @@ xfs_trans_ail_init(
if (!ailp)
return -ENOMEM;

- ailp->ail_mount = mp;
+ ailp->ail_log = mp->m_log;
INIT_LIST_HEAD(&ailp->ail_head);
INIT_LIST_HEAD(&ailp->ail_cursors);
spin_lock_init(&ailp->ail_lock);
@@ -912,7 +912,7 @@ xfs_trans_ail_init(
init_waitqueue_head(&ailp->ail_empty);

ailp->ail_task = kthread_run(xfsaild, ailp, "xfsaild/%s",
- ailp->ail_mount->m_super->s_id);
+ mp->m_super->s_id);
if (IS_ERR(ailp->ail_task))
goto out_free_ailp;

diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
index 3004aeac9110..f0d79a9050ba 100644
--- a/fs/xfs/xfs_trans_priv.h
+++ b/fs/xfs/xfs_trans_priv.h
@@ -6,6 +6,7 @@
#ifndef __XFS_TRANS_PRIV_H__
#define __XFS_TRANS_PRIV_H__

+struct xlog;
struct xfs_log_item;
struct xfs_mount;
struct xfs_trans;
@@ -50,7 +51,7 @@ struct xfs_ail_cursor {
* Eventually we need to drive the locking in here as well.
*/
struct xfs_ail {
- struct xfs_mount *ail_mount;
+ struct xlog *ail_log;
struct task_struct *ail_task;
struct list_head ail_head;
xfs_lsn_t ail_target;
--
2.35.1