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/* 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,
};
struct nfs4_slot;
struct cb_process_state {
struct nfs_client *clp;
struct nfs4_slot *slot;
struct net *net;
u32 minorversion;
__be32 drc_status;
unsigned int referring_calls;
};
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 timespec64 ctime;
struct timespec64 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 PNFS_FF_RCA4_TYPE_MASK_READ 16
#define PNFS_FF_RCA4_TYPE_MASK_RW 17
#define RCA4_TYPE_MASK_ALL 0x3f31f
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 {
uint32_t 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 */
#ifdef CONFIG_NFS_V4_2
struct cb_offloadargs {
struct nfs_fh coa_fh;
nfs4_stateid coa_stateid;
uint32_t error;
uint64_t wr_count;
struct nfs_writeverf wr_writeverf;
};
extern __be32 nfs4_callback_offload(void *args, void *dummy,
struct cb_process_state *cps);
#endif /* CONFIG_NFS_V4_2 */
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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