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
   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 #endif