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 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 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 u64 ceph_get_num_objects(struct ceph_file_layout *l, u64 size); 70 71 #endif 72