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/*
 * 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 <linux/ceph/msgr.h>
#include <linux/ceph/rados.h>

/*
 * 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);

#define CEPH_MIN_STRIPE_UNIT 65536

struct ceph_dir_layout {
	__u8   dl_dir_hash;   /* see ceph_hash.h for ids */
	__u8   dl_unused1;
	__u16  dl_unused2;
	__u32  dl_unused3;
} __attribute__ ((packed));

/* crypto algorithms */
#define CEPH_CRYPTO_NONE       0x0
#define CEPH_CRYPTO_AES        0x1
#define CEPH_CRYPTO_AES256KRB5 0x2 /* AES256-CTS-HMAC384-192 */

#define CEPH_AES_IV "cephsageyudagreg"

/* security/authentication protocols */
#define CEPH_AUTH_UNKNOWN	0x0
#define CEPH_AUTH_NONE	 	0x1
#define CEPH_AUTH_CEPHX	 	0x2

#define CEPH_AUTH_MODE_NONE		0
#define CEPH_AUTH_MODE_AUTHORIZER	1
#define CEPH_AUTH_MODE_MON		10

/* msgr2 protocol modes */
#define CEPH_CON_MODE_UNKNOWN	0x0
#define CEPH_CON_MODE_CRC	0x1
#define CEPH_CON_MODE_SECURE	0x2

#define CEPH_AUTH_UID_DEFAULT ((__u64) -1)

const char *ceph_auth_proto_name(int proto);
const char *ceph_con_mode_name(int mode);

/*********************************************
 * message layer
 */

/*
 * message types
 */

/* misc */
#define CEPH_MSG_SHUTDOWN               1
#define CEPH_MSG_PING                   2

/* client <-> monitor */
#define CEPH_MSG_MON_MAP                4
#define CEPH_MSG_MON_GET_MAP            5
#define CEPH_MSG_STATFS                 13
#define CEPH_MSG_STATFS_REPLY           14
#define CEPH_MSG_MON_SUBSCRIBE          15
#define CEPH_MSG_MON_SUBSCRIBE_ACK      16
#define CEPH_MSG_AUTH			17
#define CEPH_MSG_AUTH_REPLY		18
#define CEPH_MSG_MON_GET_VERSION        19
#define CEPH_MSG_MON_GET_VERSION_REPLY  20

/* client <-> mds */
#define CEPH_MSG_MDS