linux/ceph/striper.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _LINUX_CEPH_STRIPER_H
0003 #define _LINUX_CEPH_STRIPER_H
0004
0005 #include <linux/list.h>
0006 #include <linux/types.h>
0007
0008 struct ceph_file_layout;
0009
0010 void ceph_calc_file_object_mapping(struct ceph_file_layout *l,
0011                    u64 off, u64 len,
0012                    u64 *objno, u64 *objoff, u32 *xlen);
0013
0014 struct ceph_object_extent {
0015     struct list_head oe_item;
0016     u64 oe_objno;
0017     u64 oe_off;
0018     u64 oe_len;
0019 };
0020
0021 static inline void ceph_object_extent_init(struct ceph_object_extent *ex)
0022 {
0023     INIT_LIST_HEAD(&ex->oe_item);
0024 }
0025
0026 /*
0027  * Called for each mapped stripe unit.
0028  *
0029  * @bytes: number of bytes mapped, i.e. the minimum of the full length
0030  *         requested (file extent length) or the remainder of the stripe
0031  *         unit within an object
0032  */
0033 typedef void (*ceph_object_extent_fn_t)(struct ceph_object_extent *ex,
0034                     u32 bytes, void *arg);
0035
0036 int ceph_file_to_extents(struct ceph_file_layout *l, u64 off, u64 len,
0037              struct list_head *object_extents,
0038              struct ceph_object_extent *alloc_fn(void *arg),
0039              void *alloc_arg,
0040              ceph_object_extent_fn_t action_fn,
0041              void *action_arg);
0042 int ceph_iterate_extents(struct ceph_file_layout *l, u64 off, u64 len,
0043              struct list_head *object_extents,
0044              ceph_object_extent_fn_t action_fn,
0045              void *action_arg);
0046
0047 struct ceph_file_extent {
0048     u64 fe_off;
0049     u64 fe_len;
0050 };
0051
0052 static inline u64 ceph_file_extents_bytes(struct ceph_file_extent *file_extents,
0053                       u32 num_file_extents)
0054 {
0055     u64 bytes = 0;
0056     u32 i;
0057
0058     for (i = 0; i < num_file_extents; i++)
0059         bytes += file_extents[i].fe_len;
0060
0061     return bytes;
0062 }
0063
0064 int ceph_extent_to_file(struct ceph_file_layout *l,
0065             u64 objno, u64 objoff, u64 objlen,
0066             struct ceph_file_extent **file_extents,
0067             u32 *num_file_extents);
0068
0069 u64 ceph_get_num_objects(struct ceph_file_layout *l, u64 size);
0070
0071 #endif