include/linux/nfs_fs_sb.h - kernel/lockdown - Git at Google

 #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 */
 	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 */
 #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 */
 	struct backing_dev_info	backing_dev_info;
 	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 */
 #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			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)

 	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;
 };

 /* 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)

 #endif
	#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 */
	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 */
	#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 */
	struct backing_dev_info backing_dev_info;
	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 */
	#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 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)

	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;
	};

	/* 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)

	#endif