LXR linux/include/linux/ceph/striper.h

   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