Release 4.14 fs/nfs/callback.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/fs/nfs/callback.h
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback definitions
 */
#ifndef __LINUX_FS_NFS_CALLBACK_H

#define __LINUX_FS_NFS_CALLBACK_H
#include <linux/sunrpc/svc.h>


#define NFS4_CALLBACK 0x40000000

#define NFS4_CALLBACK_XDRSIZE 2048

#define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)


enum nfs4_callback_procnum {
	
CB_NULL = 0,
	
CB_COMPOUND = 1,
};


enum nfs4_callback_opnum {
	
OP_CB_GETATTR = 3,
	
OP_CB_RECALL  = 4,
/* Callback operations new to NFSv4.1 */
	
OP_CB_LAYOUTRECALL  = 5,
	
OP_CB_NOTIFY        = 6,
	
OP_CB_PUSH_DELEG    = 7,
	
OP_CB_RECALL_ANY    = 8,
	
OP_CB_RECALLABLE_OBJ_AVAIL = 9,
	
OP_CB_RECALL_SLOT   = 10,
	
OP_CB_SEQUENCE      = 11,
	
OP_CB_WANTS_CANCELLED = 12,
	
OP_CB_NOTIFY_LOCK   = 13,
	
OP_CB_NOTIFY_DEVICEID = 14,
/* Callback operations new to NFSv4.2 */
	
OP_CB_OFFLOAD = 15,
	
OP_CB_ILLEGAL = 10044,
};

struct nfs4_slot;

struct cb_process_state {
	
__be32			drc_status;
	
struct nfs_client	*clp;
	
struct nfs4_slot	*slot;
	
u32			minorversion;
	
struct net		*net;
};


struct cb_compound_hdr_arg {
	
unsigned int taglen;
	
const char *tag;
	
unsigned int minorversion;
	
unsigned int cb_ident; /* v4.0 callback identifier */
	
unsigned nops;
};


struct cb_compound_hdr_res {
	
__be32 *status;
	
unsigned int taglen;
	
const char *tag;
	
__be32 *nops;
};


struct cb_getattrargs {
	
struct nfs_fh fh;
	
uint32_t bitmap[2];
};


struct cb_getattrres {
	
__be32 status;
	
uint32_t bitmap[2];
	
uint64_t size;
	
uint64_t change_attr;
	
struct timespec ctime;
	
struct timespec mtime;
};


struct cb_recallargs {
	
struct nfs_fh fh;
	
nfs4_stateid stateid;
	
uint32_t truncate;
};

#if defined(CONFIG_NFS_V4_1)


struct referring_call {
	
uint32_t			rc_sequenceid;
	
uint32_t			rc_slotid;
};


struct referring_call_list {
	
struct nfs4_sessionid		rcl_sessionid;
	
uint32_t			rcl_nrefcalls;
	
struct referring_call 		*rcl_refcalls;
};


struct cb_sequenceargs {
	
struct sockaddr			*csa_addr;
	
struct nfs4_sessionid		csa_sessionid;
	
uint32_t			csa_sequenceid;
	
uint32_t			csa_slotid;
	
uint32_t			csa_highestslotid;
	
uint32_t			csa_cachethis;
	
uint32_t			csa_nrclists;
	
struct referring_call_list	*csa_rclists;
};


struct cb_sequenceres {
	
__be32				csr_status;
	
struct nfs4_sessionid		csr_sessionid;
	
uint32_t			csr_sequenceid;
	
uint32_t			csr_slotid;
	
uint32_t			csr_highestslotid;
	
uint32_t			csr_target_highestslotid;
};

extern __be32 nfs4_callback_sequence(void *argp, void *resp,
				       struct cb_process_state *cps);


#define RCA4_TYPE_MASK_RDATA_DLG	0

#define RCA4_TYPE_MASK_WDATA_DLG	1

#define RCA4_TYPE_MASK_DIR_DLG         2

#define RCA4_TYPE_MASK_FILE_LAYOUT     3

#define RCA4_TYPE_MASK_BLK_LAYOUT      4

#define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN  8

#define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX  9

#define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12

#define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15

#define RCA4_TYPE_MASK_ALL 0xf31f


struct cb_recallanyargs {
	
uint32_t	craa_objs_to_keep;
	
uint32_t	craa_type_mask;
};

extern __be32 nfs4_callback_recallany(void *argp, void *resp,
					struct cb_process_state *cps);


struct cb_recallslotargs {
	
uint32_t	crsa_target_highest_slotid;
};
extern __be32 nfs4_callback_recallslot(void *argp, void *resp,
					 struct cb_process_state *cps);


struct cb_layoutrecallargs {
	
uint32_t		cbl_recall_type;
	
uint32_t		cbl_layout_type;
	
uint32_t		cbl_layoutchanged;
	union {
		struct {
			
struct nfs_fh		cbl_fh;
			
struct pnfs_layout_range cbl_range;
			
nfs4_stateid		cbl_stateid;
		};
		
struct nfs_fsid		cbl_fsid;
	};
};

extern __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
		struct cb_process_state *cps);


struct cb_devicenotifyitem {
	
uint32_t		cbd_notify_type;
	
uint32_t		cbd_layout_type;
	
struct nfs4_deviceid	cbd_dev_id;
	
uint32_t		cbd_immediate;
};


struct cb_devicenotifyargs {
	
int				 ndevs;
	
struct cb_devicenotifyitem	 *devs;
};

extern __be32 nfs4_callback_devicenotify(void *argp, void *resp,
		struct cb_process_state *cps);


struct cb_notify_lock_args {
	
struct nfs_fh			cbnl_fh;
	
struct nfs_lowner		cbnl_owner;
	
bool				cbnl_valid;
};

extern __be32 nfs4_callback_notify_lock(void *argp, void *resp,
					 struct cb_process_state *cps);
#endif /* CONFIG_NFS_V4_1 */
extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
extern __be32 nfs4_callback_getattr(void *argp, void *resp,
				    struct cb_process_state *cps);
extern __be32 nfs4_callback_recall(void *argp, void *resp,
				   struct cb_process_state *cps);
#if IS_ENABLED(CONFIG_NFS_V4)
extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
extern void nfs_callback_down(int minorversion, struct net *net);
#endif /* CONFIG_NFS_V4 */
/*
 * nfs41: Callbacks are expected to not cause substantial latency,
 * so we limit their concurrency to 1 by setting up the maximum number
 * of slots for the backchannel.
 */

#define NFS41_BC_MIN_CALLBACKS 1

#define NFS41_BC_MAX_CALLBACKS 1


#define NFS4_MIN_NR_CALLBACK_THREADS 1

extern unsigned int nfs_callback_set_tcpport;
extern unsigned short nfs_callback_nr_threads;

#endif /* __LINUX_FS_NFS_CALLBACK_H */
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