// 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_group;
struct xfs_mount;
struct xfs_trans;

/*
 * Busy block/extent entry.  Indexed by a rbtree in the group to mark blocks
 * that have been freed but whose transactions aren't committed to disk yet.
 */
struct xfs_extent_busy {
        struct rb_node  rb_node;        /* group by-bno indexed search tree */
        struct list_head list;          /* transaction busy extent list */
        struct xfs_group *group;
        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 */
};

/*
 * List used to track groups of related busy extents all the way through
 * to discard completion.
 */
struct xfs_busy_extents {
        struct list_head        extent_list;
        struct work_struct      endio_work;

        /*
         * Owner is the object containing the struct xfs_busy_extents to free
         * once the busy extents have been processed. If only the
         * xfs_busy_extents object needs freeing, then point this at itself.
         */
        void                    *owner;
};

void xfs_extent_busy_insert(struct xfs_trans *tp, struct xfs_group *xg,
                xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags);
void xfs_extent_busy_insert_discard(struct xfs_group *xg, xfs_agblock_t bno,
                xfs_extlen_t len, struct list_head *busy_list);
void xfs_extent_busy_clear(struct list_head *list, bool do_discard);
int xfs_extent_busy_search(struct xfs_group *xg, xfs_agblock_t bno,
                xfs_extlen_t len);
void xfs_extent_busy_reuse(struct xfs_group *xg, xfs_agblock_t fbno,
                xfs_extlen_t flen, bool userdata);
bool xfs_extent_busy_trim(struct xfs_group *xg, xfs_extlen_t minlen,
                xfs_extlen_t maxlen, xfs_agblock_t *bno, xfs_extlen_t *len,
                unsigned *busy_gen);
int xfs_extent_busy_flush(struct xfs_trans *tp, struct xfs_group *xg,
                unsigned busy_gen, uint32_t alloc_flags);
void xfs_extent_busy_wait_all(struct xfs_mount *mp);
bool xfs_extent_busy_list_empty(struct xfs_group *xg, unsigned int *busy_gen);
struct xfs_extent_busy_tree *xfs_extent_busy_alloc(void);

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);
}

/*
 * Zoned RTGs don't need to track busy extents, as the actual block freeing only
 * happens by a zone reset, which forces out all transactions that touched the
 * to be reset zone first.
 */
#define xfs_group_has_extent_busy(mp, type) \
        ((type) == XG_TYPE_AG || !xfs_has_zoned((mp)))

#endif /* __XFS_EXTENT_BUSY_H__ */