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
8 struct ceph_file_layout;
9
10 void ceph_calc_file_object_mapping(struct ceph_file_layout *l,
11 u64 off, u64 len,
12 u64 *objno, u64 *objoff, u32 *xlen);
13
14 struct ceph_object_extent {
15 struct list_head oe_item;
16 u64 oe_objno;
17 u64 oe_off;
18 u64 oe_len;
19 };
20
ceph_object_extent_init(struct ceph_object_extent * ex)21 static 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 */
33 typedef void (*ceph_object_extent_fn_t)(struct ceph_object_extent *ex,
34 u32 bytes, void *arg);
35
36 int 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);
42 int 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
47 struct ceph_file_extent {
48 u64 fe_off;
49 u64 fe_len;
50 };
51
ceph_file_extents_bytes(struct ceph_file_extent * file_extents,u32 num_file_extents)52 static 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
64 int 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
69 #endif
70
