/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef _NFS_FS_SB
  #define _NFS_FS_SB
  
  #include <linux/list.h>
  #include <linux/backing-dev.h>

  #include <linux/idr.h>

  #include <linux/wait.h>

  #include <linux/nfs_xdr.h>
  #include <linux/sunrpc/xprt.h>

  #include <linux/atomic.h>

  struct nfs4_session;

  struct nfs_iostats;

  struct nlm_host;

  struct nfs4_sequence_args;
  struct nfs4_sequence_res;
  struct nfs_server;

  struct nfs4_minor_version_ops;

  struct nfs41_server_scope;

  struct nfs41_impl_id;

  /*

   * The nfs_client identifies our client state to the server.
   */
  struct nfs_client {
  	atomic_t		cl_count;

  	atomic_t		cl_mds_count;

  	int			cl_cons_state;	/* current construction state (-ve: init error) */
  #define NFS_CS_READY		0		/* ready to be used */
  #define NFS_CS_INITING		1		/* busy initialising */

  #define NFS_CS_SESSION_INITING	2		/* busy initialising  session */

  	unsigned long		cl_res_state;	/* NFS resources state */

  #define NFS_CS_CALLBACK		1		/* - callback started */
  #define NFS_CS_IDMAP		2		/* - idmap started */

  #define NFS_CS_RENEWD		3		/* - renewd started */

  #define NFS_CS_STOP_RENEW	4		/* no more state to renew */

  #define NFS_CS_CHECK_LEASE_TIME	5		/* need to check lease time */

  	unsigned long		cl_flags;	/* behavior switches */
  #define NFS_CS_NORESVPORT	0		/* - use ephemeral src port */
  #define NFS_CS_DISCRTRY		1		/* - disconnect on RPC retry */

  #define NFS_CS_MIGRATION	2		/* - transparent state migr */

  #define NFS_CS_INFINITE_SLOTS	3		/* - don't limit TCP slots */

  #define NFS_CS_NO_RETRANS_TIMEOUT	4	/* - Disable retransmit timeouts */

  #define NFS_CS_TSM_POSSIBLE	5		/* - Maybe state migration */

  	struct sockaddr_storage	cl_addr;	/* server identifier */
  	size_t			cl_addrlen;

  	char *			cl_hostname;	/* hostname of server */

  	char *			cl_acceptor;	/* GSSAPI acceptor name */

  	struct list_head	cl_share_link;	/* link in global client list */
  	struct list_head	cl_superblocks;	/* List of nfs_server structs */
  
  	struct rpc_clnt *	cl_rpcclient;

  	const struct nfs_rpc_ops *rpc_ops;	/* NFS protocol vector */

  	int			cl_proto;	/* Network transport protocol */

  	struct nfs_subversion *	cl_nfs_mod;	/* pointer to nfs version module */

  	u32			cl_minorversion;/* NFSv4 minorversion */

  	struct rpc_cred		*cl_machine_cred;

  #if IS_ENABLED(CONFIG_NFS_V4)

  	struct list_head	cl_ds_clients; /* auth flavor data servers */

  	u64			cl_clientid;	/* constant */

  	nfs4_verifier		cl_confirm;	/* Clientid verifier */

  	unsigned long		cl_state;

  	spinlock_t		cl_lock;
  
  	unsigned long		cl_lease_time;
  	unsigned long		cl_last_renewal;

  	struct delayed_work	cl_renewd;

  
  	struct rpc_wait_queue	cl_rpcwaitq;

  	/* idmapper */
  	struct idmap *		cl_idmap;

  	/* Client owner identifier */
  	const char *		cl_owner_id;

  	u32			cl_cb_ident;	/* v4.0 callback identifier */

  	const struct nfs4_minor_version_ops *cl_mvops;

  	unsigned long		cl_mig_gen;

  	/* NFSv4.0 transport blocking */
  	struct nfs4_slot_table	*cl_slot_tbl;

  	/* The sequence id to use for the next CREATE_SESSION */
  	u32			cl_seqid;
  	/* The flags used for obtaining the clientid during EXCHANGE_ID */
  	u32			cl_exchange_flags;

  	struct nfs4_session	*cl_session;	/* shared session */

  	bool			cl_preserve_clid;

  	struct nfs41_server_owner *cl_serverowner;

  	struct nfs41_server_scope *cl_serverscope;

  	struct nfs41_impl_id	*cl_implid;

  	/* nfs 4.1+ state protection modes: */
  	unsigned long		cl_sp4_flags;
  #define NFS_SP4_MACH_CRED_MINIMAL  1	/* Minimal sp4_mach_cred - state ops
  					 * must use machine cred */

  #define NFS_SP4_MACH_CRED_CLEANUP  2	/* CLOSE and LOCKU */

  #define NFS_SP4_MACH_CRED_SECINFO  3	/* SECINFO and SECINFO_NO_NAME */

  #define NFS_SP4_MACH_CRED_STATEID  4	/* TEST_STATEID and FREE_STATEID */

  #define NFS_SP4_MACH_CRED_WRITE    5	/* WRITE */
  #define NFS_SP4_MACH_CRED_COMMIT   6	/* COMMIT */

  #define NFS_SP4_MACH_CRED_PNFS_CLEANUP  7 /* LAYOUTRETURN */

  #if IS_ENABLED(CONFIG_NFS_V4_1)
  	wait_queue_head_t	cl_lock_waitq;
  #endif /* CONFIG_NFS_V4_1 */

  #endif /* CONFIG_NFS_V4 */

  	/* Our own IP address, as a null-terminated string.
  	 * This is used to generate the mv0 callback address.
  	 */
  	char			cl_ipaddr[48];

  #ifdef CONFIG_NFS_FSCACHE
  	struct fscache_cookie	*fscache;	/* client index cache cookie */
  #endif

  	struct net		*cl_net;

  };
  
  /*

   * NFS client parameters stored in the superblock.
   */
  struct nfs_server {

  	struct nfs_client *	nfs_client;	/* shared client and NFS4 state */

  	struct list_head	client_link;	/* List of other nfs_server structs
  						 * that share the same client
  						 */
  	struct list_head	master_link;	/* link in master servers list */

  	struct rpc_clnt *	client;		/* RPC client handle */

  	struct rpc_clnt *	client_acl;	/* ACL RPC client handle */

  	struct nlm_host		*nlm_host;	/* NLM client handle */

  	struct nfs_iostats __percpu *io_stats;	/* I/O statistics */

  	atomic_long_t		writeback;	/* number of writeback pages */

  	int			flags;		/* various flags */
  	unsigned int		caps;		/* server capabilities */
  	unsigned int		rsize;		/* read size */
  	unsigned int		rpages;		/* read size (in pages) */
  	unsigned int		wsize;		/* write size */
  	unsigned int		wpages;		/* write size (in pages) */
  	unsigned int		wtmult;		/* server disk block size */
  	unsigned int		dtsize;		/* readdir size */

  	unsigned short		port;		/* "port=" setting */

  	unsigned int		bsize;		/* server block size */
  	unsigned int		acregmin;	/* attr cache timeouts */
  	unsigned int		acregmax;
  	unsigned int		acdirmin;
  	unsigned int		acdirmax;
  	unsigned int		namelen;

  	unsigned int		options;	/* extra options enabled by mount */

  	unsigned int		clone_blksize;	/* granularity of a CLONE operation */

  #define NFS_OPTION_FSCACHE	0x00000001	/* - local caching enabled */

  #define NFS_OPTION_MIGRATION	0x00000002	/* - NFSv4 migration enabled */

  	struct nfs_fsid		fsid;

  	__u64			maxfilesize;	/* maximum file size */

  	struct timespec		time_delta;	/* smallest time granularity */

  	unsigned long		mount_time;	/* when this fs was mounted */

  	struct super_block	*super;		/* VFS super block */

  	dev_t			s_dev;		/* superblock dev numbers */

  	struct nfs_auth_info	auth_info;	/* parsed auth flavors */

  #ifdef CONFIG_NFS_FSCACHE
  	struct nfs_fscache_key	*fscache_key;	/* unique key for superblock */
  	struct fscache_cookie	*fscache;	/* superblock cookie */
  #endif

  	u32			pnfs_blksize;	/* layout_blksize attr */

  #if IS_ENABLED(CONFIG_NFS_V4)

  	u32			attr_bitmask[3];/* V4 bitmask representing the set

  						   of attributes supported on this
  						   filesystem */

  	u32			attr_bitmask_nl[3];
  						/* V4 bitmask representing the
  						   set of attributes supported
  						   on this filesystem excluding
  						   the label support bit. */

  	u32			exclcreat_bitmask[3];
  						/* V4 bitmask representing the
  						   set of attributes supported
  						   on this filesystem for the
  						   exclusive create. */

  	u32			cache_consistency_bitmask[3];

  						/* V4 bitmask representing the subset
  						   of change attribute, size, ctime
  						   and mtime attributes supported by
  						   the server */

  	u32			acl_bitmask;	/* V4 bitmask representing the ACEs
  						   that are supported on this
  						   filesystem */

  	u32			fh_expire_type;	/* V4 bitmask representing file
  						   handle volatility type for
  						   this filesystem */

  	struct pnfs_layoutdriver_type  *pnfs_curr_ld; /* Active layout driver */

  	struct rpc_wait_queue	roc_rpcwaitq;

  	void			*pnfs_ld_data;	/* per mount point data */

  
  	/* the following fields are protected by nfs_client->cl_lock */
  	struct rb_root		state_owners;

  #endif

  	struct ida		openowner_id;

  	struct ida		lockowner_id;

  	struct list_head	state_owners_lru;

  	struct list_head	layouts;

  	struct list_head	delegations;

  
  	unsigned long		mig_gen;
  	unsigned long		mig_status;
  #define NFS_MIG_IN_TRANSITION		(1)
  #define NFS_MIG_FAILED			(2)

  #define NFS_MIG_TSM_POSSIBLE		(3)

  	void (*destroy)(struct nfs_server *);

  
  	atomic_t active; /* Keep trace of any activity to this server */

  
  	/* mountd-related mount options */
  	struct sockaddr_storage	mountd_address;
  	size_t			mountd_addrlen;
  	u32			mountd_version;
  	unsigned short		mountd_port;
  	unsigned short		mountd_protocol;

  	struct rpc_wait_queue	uoc_rpcwaitq;

  };
  
  /* Server capabilities */
  #define NFS_CAP_READDIRPLUS	(1U << 0)
  #define NFS_CAP_HARDLINKS	(1U << 1)
  #define NFS_CAP_SYMLINKS	(1U << 2)
  #define NFS_CAP_ACLS		(1U << 3)
  #define NFS_CAP_ATOMIC_OPEN	(1U << 4)

  /* #define NFS_CAP_CHANGE_ATTR	(1U << 5) */

  #define NFS_CAP_FILEID		(1U << 6)
  #define NFS_CAP_MODE		(1U << 7)
  #define NFS_CAP_NLINK		(1U << 8)
  #define NFS_CAP_OWNER		(1U << 9)
  #define NFS_CAP_OWNER_GROUP	(1U << 10)
  #define NFS_CAP_ATIME		(1U << 11)
  #define NFS_CAP_CTIME		(1U << 12)
  #define NFS_CAP_MTIME		(1U << 13)

  #define NFS_CAP_POSIX_LOCK	(1U << 14)

  #define NFS_CAP_UIDGID_NOMAP	(1U << 15)

  #define NFS_CAP_STATEID_NFSV41	(1U << 16)

  #define NFS_CAP_ATOMIC_OPEN_V1	(1U << 17)

  #define NFS_CAP_SECURITY_LABEL	(1U << 18)

  #define NFS_CAP_SEEK		(1U << 19)

  #define NFS_CAP_ALLOCATE	(1U << 20)

  #define NFS_CAP_DEALLOCATE	(1U << 21)

  #define NFS_CAP_LAYOUTSTATS	(1U << 22)

  #define NFS_CAP_CLONE		(1U << 23)

  #define NFS_CAP_COPY		(1U << 24)

  
  #endif