+ lip = xfs_ail_min(ailp);
+ if (lip && !XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
+ if (XFS_LSN_CMP(threshold_lsn, ailp->xa_target) > 0)
+ xfsaild_wakeup(ailp, threshold_lsn);
+ }
+}
+
+/*
+ * AIL traversal cursor initialisation.
+ *
+ * The cursor keeps track of where our current traversal is up
+ * to by tracking the next ƣtem in the list for us. However, for
+ * this to be safe, removing an object from the AIL needs to invalidate
+ * any cursor that points to it. hence the traversal cursor needs to
+ * be linked to the struct xfs_ail so that deletion can search all the
+ * active cursors for invalidation.
+ *
+ * We don't link the push cursor because it is embedded in the struct
+ * xfs_ail and hence easily findable.
+ */
+STATIC void
+xfs_trans_ail_cursor_init(
+ struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur)
+{
+ cur->item = NULL;
+ if (cur == &ailp->xa_cursors)
+ return;
+
+ cur->next = ailp->xa_cursors.next;
+ ailp->xa_cursors.next = cur;
+}
+
+/*
+ * Set the cursor to the next item, because when we look
+ * up the cursor the current item may have been freed.
+ */
+STATIC void
+xfs_trans_ail_cursor_set(
+ struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur,
+ struct xfs_log_item *lip)
+{
+ if (lip)
+ cur->item = xfs_ail_next(ailp, lip);
+}
+
+/*
+ * Get the next item in the traversal and advance the cursor.
+ * If the cursor was invalidated (inidicated by a lip of 1),
+ * restart the traversal.
+ */
+struct xfs_log_item *
+xfs_trans_ail_cursor_next(
+ struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur)
+{
+ struct xfs_log_item *lip = cur->item;
+
+ if ((__psint_t)lip & 1)
+ lip = xfs_ail_min(ailp);
+ xfs_trans_ail_cursor_set(ailp, cur, lip);
+ return lip;
+}
+
+/*
+ * Now that the traversal is complete, we need to remove the cursor
+ * from the list of traversing cursors. Avoid removing the embedded
+ * push cursor, but use the fact it is always present to make the
+ * list deletion simple.
+ */
+void
+xfs_trans_ail_cursor_done(
+ struct xfs_ail *ailp,
+ struct xfs_ail_cursor *done)
+{
+ struct xfs_ail_cursor *prev = NULL;
+ struct xfs_ail_cursor *cur;
+
+ done->item = NULL;
+ if (done == &ailp->xa_cursors)
+ return;
+ prev = &ailp->xa_cursors;
+ for (cur = prev->next; cur; prev = cur, cur = prev->next) {
+ if (cur == done) {
+ prev->next = cur->next;
+ break;
+ }
+ }
+ ASSERT(cur);
+}
+
+/*
+ * Invalidate any cursor that is pointing to this item. This is
+ * called when an item is removed from the AIL. Any cursor pointing
+ * to this object is now invalid and the traversal needs to be
+ * terminated so it doesn't reference a freed object. We set the
+ * cursor item to a value of 1 so we can distinguish between an
+ * invalidation and the end of the list when getting the next item
+ * from the cursor.
+ */
+STATIC void
+xfs_trans_ail_cursor_clear(
+ struct xfs_ail *ailp,
+ struct xfs_log_item *lip)
+{
+ struct xfs_ail_cursor *cur;
+
+ /* need to search all cursors */
+ for (cur = &ailp->xa_cursors; cur; cur = cur->next) {
+ if (cur->item == lip)
+ cur->item = (struct xfs_log_item *)
+ ((__psint_t)cur->item | 1);