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τ _I|+ ? /* SPDX-License-Identifier: GPL-2.0 */
/*
* ceph_fs.h - Ceph constants and data types to share between kernel and
* user space.
*
* Most types in this file are defined as little-endian, and are
* primarily intended to describe data structures that pass over the
* wire or that are stored on disk.
*
* LGPL2
*/
#ifndef CEPH_FS_H
#define CEPH_FS_H
#include
#include
/*
* subprotocol versions. when specific messages types or high-level
* protocols change, bump the affected components. we keep rev
* internal cluster protocols separately from the public,
* client-facing protocol.
*/
#define CEPH_OSDC_PROTOCOL 24 /* server/client */
#define CEPH_MDSC_PROTOCOL 32 /* server/client */
#define CEPH_MONC_PROTOCOL 15 /* server/client */
#define CEPH_INO_ROOT 1
#define CEPH_INO_CEPH 2 /* hidden .ceph dir */
#define CEPH_INO_GLOBAL_SNAPREALM 3 /* global dummy snaprealm */
/* arbitrary limit on max # of monitors (cluster of 3 is typical) */
#define CEPH_MAX_MON 31
/*
* legacy ceph_file_layoute
*/
struct ceph_file_layout_legacy {
/* file -> object mapping */
__le32 fl_stripe_unit; /* stripe unit, in bytes. must be multiple
of page size. */
__le32 fl_stripe_count; /* over this many objects */
__le32 fl_object_size; /* until objects are this big, then move to
new objects */
__le32 fl_cas_hash; /* UNUSED. 0 = none; 1 = sha256 */
/* pg -> disk layout */
__le32 fl_object_stripe_unit; /* UNUSED. for per-object parity, if any */
/* object -> pg layout */
__le32 fl_unused; /* unused; used to be preferred primary for pg (-1 for none) */
__le32 fl_pg_pool; /* namespace, crush ruleset, rep level */
} __attribute__ ((packed));
struct ceph_string;
/*
* ceph_file_layout - describe data layout for a file/inode
*/
struct ceph_file_layout {
/* file -> object mapping */
u32 stripe_unit; /* stripe unit, in bytes */
u32 stripe_count; /* over this many objects */
u32 object_size; /* until objects are this big */
s64 pool_id; /* rados pool id */
struct ceph_string __rcu *pool_ns; /* rados pool namespace */
};
extern int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
extern void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
struct ceph_file_layout_legacy *legacy);
extern void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
struct ceph_file_layout_legacy *legacy);
#de