1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_CEPH_STRIPER_H
3#define _LINUX_CEPH_STRIPER_H
4
5#include <linux/list.h>
6#include <linux/types.h>
7
8struct ceph_file_layout;
9
10void ceph_calc_file_object_mapping(struct ceph_file_layout *l,
11				   u64 off, u64 len,
12				   u64 *objno, u64 *objoff, u32 *xlen);
13
14struct ceph_object_extent {
15	struct list_head oe_item;
16	u64 oe_objno;
17	u64 oe_off;
18	u64 oe_len;
19};
20
21static inline void ceph_object_extent_init(struct ceph_object_extent *ex)
22{
23	INIT_LIST_HEAD(&ex->oe_item);
24}
25
26/*
27 * Called for each mapped stripe unit.
28 *
29 * @bytes: number of bytes mapped, i.e. the minimum of the full length
30 *         requested (file extent length) or the remainder of the stripe
31 *         unit within an object
32 */
33typedef void (*ceph_object_extent_fn_t)(struct ceph_object_extent *ex,
34					u32 bytes, void *arg);
35
36int ceph_file_to_extents(struct ceph_file_layout *l, u64 off, u64 len,
37			 struct list_head *object_extents,
38			 struct ceph_object_extent *alloc_fn(void *arg),
39			 void *alloc_arg,
40			 ceph_object_extent_fn_t action_fn,
41			 void *action_arg);
42int ceph_iterate_extents(struct ceph_file_layout *l, u64 off, u64 len,
43			 struct list_head *object_extents,
44			 ceph_object_extent_fn_t action_fn,
45			 void *action_arg);
46
47struct ceph_file_extent {
48	u64 fe_off;
49	u64 fe_len;
50};
51
52static inline u64 ceph_file_extents_bytes(struct ceph_file_extent *file_extents,
53					  u32 num_file_extents)
54{
55	u64 bytes = 0;
56	u32 i;
57
58	for (i = 0; i < num_file_extents; i++)
59		bytes += file_extents[i].fe_len;
60
61	return bytes;
62}
63
64int ceph_extent_to_file(struct ceph_file_layout *l,
65			u64 objno, u64 objoff, u64 objlen,
66			struct ceph_file_extent **file_extents,
67			u32 *num_file_extents);
68
69u64 ceph_get_num_objects(struct ceph_file_layout *l, u64 size);
70
71#endif
72