xref: /openbmc/linux/fs/xfs/xfs_extent_busy.h (revision 7f904d7e1f3ec7c2de47c024a5a5c30988b54703)
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  
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