Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 183 insertions, 0 deletions

diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
new file mode 100644
index 000000000..091eae9f4
--- /dev/null
+++ b/fs/xfs/xfs_trans_priv.h
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_TRANS_PRIV_H__
+#define	__XFS_TRANS_PRIV_H__
+
+struct xfs_log_item;
+struct xfs_mount;
+struct xfs_trans;
+struct xfs_ail;
+struct xfs_log_vec;
+
+
+void	xfs_trans_init(struct xfs_mount *);
+void	xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
+void	xfs_trans_del_item(struct xfs_log_item *);
+void	xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
+				bool abort);
+void	xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
+
+void	xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
+				xfs_lsn_t commit_lsn, int aborted);
+/*
+ * AIL traversal cursor.
+ *
+ * Rather than using a generation number for detecting changes in the ail, use
+ * a cursor that is protected by the ail lock. The aild cursor exists in the
+ * struct xfs_ail, but other traversals can declare it on the stack and link it
+ * to the ail list.
+ *
+ * When an object is deleted from or moved int the AIL, the cursor list is
+ * searched to see if the object is a designated cursor item. If it is, it is
+ * deleted from the cursor so that the next time the cursor is used traversal
+ * will return to the start.
+ *
+ * This means a traversal colliding with a removal will cause a restart of the
+ * list scan, rather than any insertion or deletion anywhere in the list. The
+ * low bit of the item pointer is set if the cursor has been invalidated so
+ * that we can tell the difference between invalidation and reaching the end
+ * of the list to trigger traversal restarts.
+ */
+struct xfs_ail_cursor {
+	struct list_head	list;
+	struct xfs_log_item	*item;
+};
+
+/*
+ * Private AIL structures.
+ *
+ * Eventually we need to drive the locking in here as well.
+ */
+struct xfs_ail {
+	struct xfs_mount	*ail_mount;
+	struct task_struct	*ail_task;
+	struct list_head	ail_head;
+	xfs_lsn_t		ail_target;
+	xfs_lsn_t		ail_target_prev;
+	struct list_head	ail_cursors;
+	spinlock_t		ail_lock;
+	xfs_lsn_t		ail_last_pushed_lsn;
+	int			ail_log_flush;
+	struct list_head	ail_buf_list;
+	wait_queue_head_t	ail_empty;
+};
+
+/*
+ * From xfs_trans_ail.c
+ */
+void	xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
+				struct xfs_ail_cursor *cur,
+				struct xfs_log_item **log_items, int nr_items,
+				xfs_lsn_t lsn) __releases(ailp->ail_lock);
+/*
+ * Return a pointer to the first item in the AIL.  If the AIL is empty, then
+ * return NULL.
+ */
+static inline struct xfs_log_item *
+xfs_ail_min(
+	struct xfs_ail  *ailp)
+{
+	return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item,
+					li_ail);
+}
+
+static inline void
+xfs_trans_ail_update(
+	struct xfs_ail		*ailp,
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn) __releases(ailp->ail_lock)
+{
+	xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
+}
+
+bool xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
+void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip,
+		int shutdown_type) __releases(ailp->ail_lock);
+
+static inline void
+xfs_trans_ail_remove(
+	struct xfs_log_item	*lip,
+	int			shutdown_type)
+{
+	struct xfs_ail		*ailp = lip->li_ailp;
+
+	spin_lock(&ailp->ail_lock);
+	/* xfs_trans_ail_delete() drops the AIL lock */
+	if (test_bit(XFS_LI_IN_AIL, &lip->li_flags))
+		xfs_trans_ail_delete(ailp, lip, shutdown_type);
+	else
+		spin_unlock(&ailp->ail_lock);
+}
+
+void			xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
+void			xfs_ail_push_all(struct xfs_ail *);
+void			xfs_ail_push_all_sync(struct xfs_ail *);
+struct xfs_log_item	*xfs_ail_min(struct xfs_ail  *ailp);
+xfs_lsn_t		xfs_ail_min_lsn(struct xfs_ail *ailp);
+
+struct xfs_log_item *	xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
+					struct xfs_ail_cursor *cur,
+					xfs_lsn_t lsn);
+struct xfs_log_item *	xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
+					struct xfs_ail_cursor *cur,
+					xfs_lsn_t lsn);
+struct xfs_log_item *	xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
+					struct xfs_ail_cursor *cur);
+void			xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
+
+#if BITS_PER_LONG != 64
+static inline void
+xfs_trans_ail_copy_lsn(
+	struct xfs_ail	*ailp,
+	xfs_lsn_t	*dst,
+	xfs_lsn_t	*src)
+{
+	ASSERT(sizeof(xfs_lsn_t) == 8);	/* don't lock if it shrinks */
+	spin_lock(&ailp->ail_lock);
+	*dst = *src;
+	spin_unlock(&ailp->ail_lock);
+}
+#else
+static inline void
+xfs_trans_ail_copy_lsn(
+	struct xfs_ail	*ailp,
+	xfs_lsn_t	*dst,
+	xfs_lsn_t	*src)
+{
+	ASSERT(sizeof(xfs_lsn_t) == 8);
+	*dst = *src;
+}
+#endif
+
+static inline void
+xfs_clear_li_failed(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_buf	*bp = lip->li_buf;
+
+	ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags));
+	lockdep_assert_held(&lip->li_ailp->ail_lock);
+
+	if (test_and_clear_bit(XFS_LI_FAILED, &lip->li_flags)) {
+		lip->li_buf = NULL;
+		xfs_buf_rele(bp);
+	}
+}
+
+static inline void
+xfs_set_li_failed(
+	struct xfs_log_item	*lip,
+	struct xfs_buf		*bp)
+{
+	lockdep_assert_held(&lip->li_ailp->ail_lock);
+
+	if (!test_and_set_bit(XFS_LI_FAILED, &lip->li_flags)) {
+		xfs_buf_hold(bp);
+		lip->li_buf = bp;
+	}
+}
+
+#endif	/* __XFS_TRANS_PRIV_H__ */