/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_ATTR_SF_H__
#define __XFS_ATTR_SF_H__

/*
 * We generate this then sort it, attr_list() must return things in hash-order.
 */
typedef struct xfs_attr_sf_sort {
        uint8_t         entno;          /* entry number in original list */
        uint8_t         namelen;        /* length of name value (no null) */
        uint8_t         valuelen;       /* length of value */
        uint8_t         flags;          /* flags bits (see xfs_attr_leaf.h) */
        xfs_dahash_t    hash;           /* this entry's hash value */
        unsigned char   *name;          /* name value, pointer into buffer */
        void            *value;
} xfs_attr_sf_sort_t;

#define XFS_ATTR_SF_ENTSIZE_MAX                 /* max space for name&value */ \
        ((1 << (NBBY*(int)sizeof(uint8_t))) - 1)

/* space name/value uses */
static inline int xfs_attr_sf_entsize_byname(uint8_t nlen, uint8_t vlen)
{
        return sizeof(struct xfs_attr_sf_entry) + nlen + vlen;
}

/* space an entry uses */
static inline int xfs_attr_sf_entsize(struct xfs_attr_sf_entry *sfep)
{
        return struct_size(sfep, nameval, sfep->namelen + sfep->valuelen);
}

/* first entry in the SF attr fork */
static inline struct xfs_attr_sf_entry *
xfs_attr_sf_firstentry(struct xfs_attr_sf_hdr *hdr)
{
        return (struct xfs_attr_sf_entry *)(hdr + 1);
}

/* next entry after sfep */
static inline struct xfs_attr_sf_entry *
xfs_attr_sf_nextentry(struct xfs_attr_sf_entry *sfep)
{
        return (void *)sfep + xfs_attr_sf_entsize(sfep);
}

/* pointer to the space after the last entry, e.g. for adding a new one */
static inline struct xfs_attr_sf_entry *
xfs_attr_sf_endptr(struct xfs_attr_sf_hdr *sf)
{
        return (void *)sf + be16_to_cpu(sf->totsize);
}

#endif  /* __XFS_ATTR_SF_H__ */