/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CEPH_STRIPER_H
#define _LINUX_CEPH_STRIPER_H

#include <linux/list.h>
#include <linux/types.h>

struct ceph_file_layout;

void ceph_calc_file_object_mapping(struct ceph_file_layout *l,
                                   u64 off, u64 len,
                                   u64 *objno, u64 *objoff, u32 *xlen);

struct ceph_object_extent {
        struct list_head oe_item;
        u64 oe_objno;
        u64 oe_off;
        u64 oe_len;
};

static inline void ceph_object_extent_init(struct ceph_object_extent *ex)
{
        INIT_LIST_HEAD(&ex->oe_item);
}

/*
 * Called for each mapped stripe unit.
 *
 * @bytes: number of bytes mapped, i.e. the minimum of the full length
 *         requested (file extent length) or the remainder of the stripe
 *         unit within an object
 */
typedef void (*ceph_object_extent_fn_t)(struct ceph_object_extent *ex,
                                        u32 bytes, void *arg);

int ceph_file_to_extents(struct ceph_file_layout *l, u64 off, u64 len,
                         struct list_head *object_extents,
                         struct ceph_object_extent *alloc_fn(void *arg),
                         void *alloc_arg,
                         ceph_object_extent_fn_t action_fn,
                         void *action_arg);
int ceph_iterate_extents(struct ceph_file_layout *l, u64 off, u64 len,
                         struct list_head *object_extents,
                         ceph_object_extent_fn_t action_fn,
                         void *action_arg);

struct ceph_file_extent {
        u64 fe_off;
        u64 fe_len;
};

static inline u64 ceph_file_extents_bytes(struct ceph_file_extent *file_extents,
                                          u32 num_file_extents)
{
        u64 bytes = 0;
        u32 i;

        for (i = 0; i < num_file_extents; i++)
                bytes += file_extents[i].fe_len;

        return bytes;
}

int ceph_extent_to_file(struct ceph_file_layout *l,
                        u64 objno, u64 objoff, u64 objlen,
                        struct ceph_file_extent **file_extents,
                        u32 *num_file_extents);

u64 ceph_get_num_objects(struct ceph_file_layout *l, u64 size);

#endif