// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_IALLOC_H__
#define __XFS_IALLOC_H__

struct xfs_buf;
struct xfs_dinode;
struct xfs_imap;
struct xfs_mount;
struct xfs_trans;
struct xfs_btree_cur;
struct xfs_perag;

/* Move inodes in clusters of this size */
#define XFS_INODE_BIG_CLUSTER_SIZE      8192

struct xfs_icluster {
        bool            deleted;        /* record is deleted */
        xfs_ino_t       first_ino;      /* first inode number */
        uint64_t        alloc;          /* inode phys. allocation bitmap for
                                         * sparse chunks */
};

/*
 * Make an inode pointer out of the buffer/offset.
 */
static inline struct xfs_dinode *
xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
{
        return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
}

struct xfs_icreate_args;

/*
 * Allocate an inode on disk.  Mode is used to tell whether the new inode will
 * need space, and whether it is a directory.
 */
int xfs_dialloc(struct xfs_trans **tpp, const struct xfs_icreate_args *args,
                xfs_ino_t *new_ino);

int xfs_difree(struct xfs_trans *tp, struct xfs_perag *pag,
                xfs_ino_t ino, struct xfs_icluster *ifree);

/*
 * Return the location of the inode in imap, for mapping it into a buffer.
 */
int
xfs_imap(
        struct xfs_perag *pag,
        struct xfs_trans *tp,           /* transaction pointer */
        xfs_ino_t       ino,            /* inode to locate */
        struct xfs_imap *imap,          /* location map structure */
        uint            flags);         /* flags for inode btree lookup */

/*
 * Log specified fields for the ag hdr (inode section)
 */
void
xfs_ialloc_log_agi(
        struct xfs_trans *tp,           /* transaction pointer */
        struct xfs_buf  *bp,            /* allocation group header buffer */
        uint32_t        fields);        /* bitmask of fields to log */

int xfs_read_agi(struct xfs_perag *pag, struct xfs_trans *tp, xfs_buf_flags_t flags,
                struct xfs_buf **agibpp);
int xfs_ialloc_read_agi(struct xfs_perag *pag, struct xfs_trans *tp,
                int flags, struct xfs_buf **agibpp);
#define XFS_IALLOC_FLAG_TRYLOCK (1U << 0)  /* use trylock for buffer locking */

/*
 * Lookup a record by ino in the btree given by cur.
 */
int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
                xfs_lookup_t dir, int *stat);

/*
 * Get the data from the pointed-to record.
 */
int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
                xfs_inobt_rec_incore_t *rec, int *stat);
uint8_t xfs_inobt_rec_freecount(const struct xfs_inobt_rec_incore *irec);

/*
 * Inode chunk initialisation routine
 */
int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
                          struct list_head *buffer_list, int icount,
                          xfs_agnumber_t agno, xfs_agblock_t agbno,
                          xfs_agblock_t length, unsigned int gen);


union xfs_btree_rec;
void xfs_inobt_btrec_to_irec(struct xfs_mount *mp,
                const union xfs_btree_rec *rec,
                struct xfs_inobt_rec_incore *irec);
xfs_failaddr_t xfs_inobt_check_irec(struct xfs_perag *pag,
                const struct xfs_inobt_rec_incore *irec);
int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
                xfs_agblock_t bno, xfs_extlen_t len,
                enum xbtree_recpacking *outcome);
int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
                xfs_agino_t *freecount);
int xfs_inobt_insert_rec(struct xfs_btree_cur *cur, uint16_t holemask,
                uint8_t count, int32_t freecount, xfs_inofree_t free,
                int *stat);

int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);

int xfs_ialloc_check_shrink(struct xfs_perag *pag, struct xfs_trans *tp,
                struct xfs_buf *agibp, xfs_agblock_t new_length);

#endif  /* __XFS_IALLOC_H__ */