// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2022-2024 Oracle.
 * All Rights Reserved.
 */
#ifndef __XFS_PARENT_H__
#define __XFS_PARENT_H__

/* Metadata validators */
bool xfs_parent_namecheck(unsigned int attr_flags, const void *name,
                size_t length);
bool xfs_parent_valuecheck(struct xfs_mount *mp, const void *value,
                size_t valuelen);

xfs_dahash_t xfs_parent_hashval(struct xfs_mount *mp, const uint8_t *name,
                int namelen, xfs_ino_t parent_ino);
xfs_dahash_t xfs_parent_hashattr(struct xfs_mount *mp, const uint8_t *name,
                int namelen, const void *value, int valuelen);

/* Initializes a xfs_parent_rec to be stored as an attribute name. */
static inline void
xfs_parent_rec_init(
        struct xfs_parent_rec   *rec,
        xfs_ino_t               ino,
        uint32_t                gen)
{
        rec->p_ino = cpu_to_be64(ino);
        rec->p_gen = cpu_to_be32(gen);
}

/* Initializes a xfs_parent_rec to be stored as an attribute name. */
static inline void
xfs_inode_to_parent_rec(
        struct xfs_parent_rec   *rec,
        const struct xfs_inode  *dp)
{
        xfs_parent_rec_init(rec, dp->i_ino, VFS_IC(dp)->i_generation);
}

extern struct kmem_cache        *xfs_parent_args_cache;

/*
 * Parent pointer information needed to pass around the deferred xattr update
 * machinery.
 */
struct xfs_parent_args {
        struct xfs_parent_rec   rec;
        struct xfs_parent_rec   new_rec;
        struct xfs_da_args      args;
};

/*
 * Start a parent pointer update by allocating the context object we need to
 * perform a parent pointer update.
 */
static inline int
xfs_parent_start(
        struct xfs_mount        *mp,
        struct xfs_parent_args  **ppargsp)
{
        if (!xfs_has_parent(mp)) {
                *ppargsp = NULL;
                return 0;
        }

        *ppargsp = kmem_cache_zalloc(xfs_parent_args_cache, GFP_KERNEL);
        if (!*ppargsp)
                return -ENOMEM;
        return 0;
}

/* Finish a parent pointer update by freeing the context object. */
static inline void
xfs_parent_finish(
        struct xfs_mount        *mp,
        struct xfs_parent_args  *ppargs)
{
        if (ppargs)
                kmem_cache_free(xfs_parent_args_cache, ppargs);
}

int xfs_parent_addname(struct xfs_trans *tp, struct xfs_parent_args *ppargs,
                struct xfs_inode *dp, const struct xfs_name *parent_name,
                struct xfs_inode *child);
int xfs_parent_removename(struct xfs_trans *tp, struct xfs_parent_args *ppargs,
                struct xfs_inode *dp, const struct xfs_name *parent_name,
                struct xfs_inode *child);
int xfs_parent_replacename(struct xfs_trans *tp,
                struct xfs_parent_args *ppargs,
                struct xfs_inode *old_dp, const struct xfs_name *old_name,
                struct xfs_inode *new_dp, const struct xfs_name *new_name,
                struct xfs_inode *child);

int xfs_parent_from_attr(struct xfs_mount *mp, unsigned int attr_flags,
                const unsigned char *name, unsigned int namelen,
                const void *value, unsigned int valuelen,
                xfs_ino_t *parent_ino, uint32_t *parent_gen);

/* Repair functions */
int xfs_parent_lookup(struct xfs_trans *tp, struct xfs_inode *ip,
                const struct xfs_name *name, struct xfs_parent_rec *pptr,
                struct xfs_da_args *scratch);
int xfs_parent_set(struct xfs_inode *ip, xfs_ino_t owner,
                const struct xfs_name *name, struct xfs_parent_rec *pptr,
                struct xfs_da_args *scratch);
int xfs_parent_unset(struct xfs_inode *ip, xfs_ino_t owner,
                const struct xfs_name *name, struct xfs_parent_rec *pptr,
                struct xfs_da_args *scratch);

#endif /* __XFS_PARENT_H__ */