1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
4  * Copyright (c) 2010 David Chinner.
5  * Copyright (c) 2011 Christoph Hellwig.
6  * All Rights Reserved.
7  */
8 #ifndef __XFS_EXTENT_BUSY_H__
9 #define	__XFS_EXTENT_BUSY_H__
10 
11 struct xfs_mount;
12 struct xfs_trans;
13 struct xfs_alloc_arg;
14 
15 /*
16  * Busy block/extent entry.  Indexed by a rbtree in perag to mark blocks that
17  * have been freed but whose transactions aren't committed to disk yet.
18  *
19  * Note that we use the transaction ID to record the transaction, not the
20  * transaction structure itself. See xfs_extent_busy_insert() for details.
21  */
22 struct xfs_extent_busy {
23 	struct rb_node	rb_node;	/* ag by-bno indexed search tree */
24 	struct list_head list;		/* transaction busy extent list */
25 	xfs_agnumber_t	agno;
26 	xfs_agblock_t	bno;
27 	xfs_extlen_t	length;
28 	unsigned int	flags;
29 #define XFS_EXTENT_BUSY_DISCARDED	0x01	/* undergoing a discard op. */
30 #define XFS_EXTENT_BUSY_SKIP_DISCARD	0x02	/* do not discard */
31 };
32 
33 void
34 xfs_extent_busy_insert(struct xfs_trans *tp, xfs_agnumber_t agno,
35 	xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags);
36 
37 void
38 xfs_extent_busy_clear(struct xfs_mount *mp, struct list_head *list,
39 	bool do_discard);
40 
41 int
42 xfs_extent_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno,
43 	xfs_agblock_t bno, xfs_extlen_t len);
44 
45 void
46 xfs_extent_busy_reuse(struct xfs_mount *mp, xfs_agnumber_t agno,
47 	xfs_agblock_t fbno, xfs_extlen_t flen, bool userdata);
48 
49 bool
50 xfs_extent_busy_trim(struct xfs_alloc_arg *args, xfs_agblock_t *bno,
51 		xfs_extlen_t *len, unsigned *busy_gen);
52 
53 void
54 xfs_extent_busy_flush(struct xfs_mount *mp, struct xfs_perag *pag,
55 	unsigned busy_gen);
56 
57 void
58 xfs_extent_busy_wait_all(struct xfs_mount *mp);
59 
60 int
61 xfs_extent_busy_ag_cmp(void *priv, struct list_head *a, struct list_head *b);
62 
xfs_extent_busy_sort(struct list_head * list)63 static inline void xfs_extent_busy_sort(struct list_head *list)
64 {
65 	list_sort(NULL, list, xfs_extent_busy_ag_cmp);
66 }
67 
68 #endif /* __XFS_EXTENT_BUSY_H__ */
69