1 files changed, 70 insertions, 0 deletions
diff --git a/fs/xfs/xfs_extent_busy.h b/fs/xfs/xfs_extent_busy.h
new file mode 100644
index 000000000..4a1181310
--- /dev/null
+++ b/fs/xfs/xfs_extent_busy.h
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2010 David Chinner.
+ * Copyright (c) 2011 Christoph Hellwig.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_EXTENT_BUSY_H__
+#define	__XFS_EXTENT_BUSY_H__
+
+struct xfs_mount;
+struct xfs_perag;
+struct xfs_trans;
+struct xfs_alloc_arg;
+
+/*
+ * Busy block/extent entry.  Indexed by a rbtree in perag to mark blocks that
+ * have been freed but whose transactions aren't committed to disk yet.
+ *
+ * Note that we use the transaction ID to record the transaction, not the
+ * transaction structure itself. See xfs_extent_busy_insert() for details.
+ */
+struct xfs_extent_busy {
+	struct rb_node	rb_node;	/* ag by-bno indexed search tree */
+	struct list_head list;		/* transaction busy extent list */
+	xfs_agnumber_t	agno;
+	xfs_agblock_t	bno;
+	xfs_extlen_t	length;
+	unsigned int	flags;
+#define XFS_EXTENT_BUSY_DISCARDED	0x01	/* undergoing a discard op. */
+#define XFS_EXTENT_BUSY_SKIP_DISCARD	0x02	/* do not discard */
+};
+
+void
+xfs_extent_busy_insert(struct xfs_trans *tp, struct xfs_perag *pag,
+	xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags);
+
+void
+xfs_extent_busy_clear(struct xfs_mount *mp, struct list_head *list,
+	bool do_discard);
+
+int
+xfs_extent_busy_search(struct xfs_mount *mp, struct xfs_perag *pag,
+	xfs_agblock_t bno, xfs_extlen_t len);
+
+void
+xfs_extent_busy_reuse(struct xfs_mount *mp, struct xfs_perag *pag,
+	xfs_agblock_t fbno, xfs_extlen_t flen, bool userdata);
+
+bool
+xfs_extent_busy_trim(struct xfs_alloc_arg *args, xfs_agblock_t *bno,
+		xfs_extlen_t *len, unsigned *busy_gen);
+
+void
+xfs_extent_busy_flush(struct xfs_mount *mp, struct xfs_perag *pag,
+	unsigned busy_gen);
+
+void
+xfs_extent_busy_wait_all(struct xfs_mount *mp);
+
+int
+xfs_extent_busy_ag_cmp(void *priv, const struct list_head *a,
+	const struct list_head *b);
+
+static inline void xfs_extent_busy_sort(struct list_head *list)
+{
+	list_sort(NULL, list, xfs_extent_busy_ag_cmp);
+}
+
+#endif /* __XFS_EXTENT_BUSY_H__ */