include/linux/nfs_fs.h - kernel/msm-4.9 - Gitiles

 /*
  *  linux/include/linux/nfs_fs.h
  *
  *  Copyright (C) 1992  Rick Sladkey
  *
  *  OS-specific nfs filesystem definitions and declarations
  */
 #ifndef _LINUX_NFS_FS_H
 #define _LINUX_NFS_FS_H

 #include <uapi/linux/nfs_fs.h>


 /*
  * Enable dprintk() debugging support for nfs client.
  */
 #ifdef CONFIG_NFS_DEBUG
 # define NFS_DEBUG
 #endif

 #include <linux/in.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/rbtree.h>
 #include <linux/rwsem.h>
 #include <linux/wait.h>

 #include <linux/sunrpc/debug.h>
 #include <linux/sunrpc/auth.h>
 #include <linux/sunrpc/clnt.h>

 #include <linux/nfs.h>
 #include <linux/nfs2.h>
 #include <linux/nfs3.h>
 #include <linux/nfs4.h>
 #include <linux/nfs_xdr.h>
 #include <linux/nfs_fs_sb.h>

 #include <linux/mempool.h>

 /*
  * These are the default flags for swap requests
  */
 #define NFS_RPC_SWAPFLAGS		(RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)

 /*
  * NFSv3/v4 Access mode cache entry
  */
 struct nfs_access_entry {
 	struct rb_node		rb_node;
 	struct list_head	lru;
 	unsigned long		jiffies;
 	struct rpc_cred *	cred;
 	int			mask;
 	struct rcu_head		rcu_head;
 };

 struct nfs_lockowner {
 	fl_owner_t l_owner;
 	pid_t l_pid;
 };

 struct nfs_lock_context {
 	atomic_t count;
 	struct list_head list;
 	struct nfs_open_context *open_context;
 	struct nfs_lockowner lockowner;
 	atomic_t io_count;
 };

 struct nfs4_state;
 struct nfs_open_context {
 	struct nfs_lock_context lock_context;
 	struct dentry *dentry;
 	struct rpc_cred *cred;
 	struct nfs4_state *state;
 	fmode_t mode;

 	unsigned long flags;
 #define NFS_CONTEXT_ERROR_WRITE		(0)
 #define NFS_CONTEXT_RESEND_WRITES	(1)
 #define NFS_CONTEXT_BAD			(2)
 	int error;

 	struct list_head list;
 	struct nfs4_threshold	*mdsthreshold;
 };

 struct nfs_open_dir_context {
 	struct list_head list;
 	struct rpc_cred *cred;
 	unsigned long attr_gencount;
 	__u64 dir_cookie;
 	__u64 dup_cookie;
 	signed char duped;
 };

 /*
  * NFSv4 delegation
  */
 struct nfs_delegation;

 struct posix_acl;

 /*
  * nfs fs inode data in memory
  */
 struct nfs_inode {
 	/*
 	 * The 64bit 'inode number'
 	 */
 	__u64 fileid;

 	/*
 	 * NFS file handle
 	 */
 	struct nfs_fh		fh;

 	/*
 	 * Various flags
 	 */
 	unsigned long		flags;			/* atomic bit ops */
 	unsigned long		cache_validity;		/* bit mask */

 	/*
 	 * read_cache_jiffies is when we started read-caching this inode.
 	 * attrtimeo is for how long the cached information is assumed
 	 * to be valid. A successful attribute revalidation doubles
 	 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 	 * acregmin/acdirmin.
 	 *
 	 * We need to revalidate the cached attrs for this inode if
 	 *
 	 *	jiffies - read_cache_jiffies >= attrtimeo
 	 *
 	 * Please note the comparison is greater than or equal
 	 * so that zero timeout values can be specified.
 	 */
 	unsigned long		read_cache_jiffies;
 	unsigned long		attrtimeo;
 	unsigned long		attrtimeo_timestamp;

 	unsigned long		attr_gencount;
 	/* "Generation counter" for the attribute cache. This is
 	 * bumped whenever we update the metadata on the
 	 * server.
 	 */
 	unsigned long		cache_change_attribute;

 	struct rb_root		access_cache;
 	struct list_head	access_cache_entry_lru;
 	struct list_head	access_cache_inode_lru;

 	/*
 	 * This is the cookie verifier used for NFSv3 readdir
 	 * operations
 	 */
 	__be32			cookieverf[2];

 	unsigned long		nrequests;
 	struct nfs_mds_commit_info commit_info;

 	/* Open contexts for shared mmap writes */
 	struct list_head	open_files;

 	/* Number of in-flight sillydelete RPC calls */
 	atomic_t		silly_count;
 	/* List of deferred sillydelete requests */
 	struct hlist_head	silly_list;
 	wait_queue_head_t	waitqueue;

 #if IS_ENABLED(CONFIG_NFS_V4)
 	struct nfs4_cached_acl	*nfs4_acl;
         /* NFSv4 state */
 	struct list_head	open_states;
 	struct nfs_delegation __rcu *delegation;
 	struct rw_semaphore	rwsem;

 	/* pNFS layout information */
 	struct pnfs_layout_hdr *layout;
 #endif /* CONFIG_NFS_V4*/
 	/* how many bytes have been written/read and how many bytes queued up */
 	__u64 write_io;
 	__u64 read_io;
 #ifdef CONFIG_NFS_FSCACHE
 	struct fscache_cookie	*fscache;
 #endif
 	struct inode		vfs_inode;
 };

 /*
  * Cache validity bit flags
  */
 #define NFS_INO_INVALID_ATTR	0x0001		/* cached attrs are invalid */
 #define NFS_INO_INVALID_DATA	0x0002		/* cached data is invalid */
 #define NFS_INO_INVALID_ATIME	0x0004		/* cached atime is invalid */
 #define NFS_INO_INVALID_ACCESS	0x0008		/* cached access cred invalid */
 #define NFS_INO_INVALID_ACL	0x0010		/* cached acls are invalid */
 #define NFS_INO_REVAL_PAGECACHE	0x0020		/* must revalidate pagecache */
 #define NFS_INO_REVAL_FORCED	0x0040		/* force revalidation ignoring a delegation */
 #define NFS_INO_INVALID_LABEL	0x0080		/* cached label is invalid */

 /*
  * Bit offsets in flags field
  */
 #define NFS_INO_ADVISE_RDPLUS	(0)		/* advise readdirplus */
 #define NFS_INO_STALE		(1)		/* possible stale inode */
 #define NFS_INO_ACL_LRU_SET	(2)		/* Inode is on the LRU list */
 #define NFS_INO_INVALIDATING	(3)		/* inode is being invalidated */
 #define NFS_INO_FLUSHING	(4)		/* inode is flushing out data */
 #define NFS_INO_FSCACHE		(5)		/* inode can be cached by FS-Cache */
 #define NFS_INO_FSCACHE_LOCK	(6)		/* FS-Cache cookie management lock */
 #define NFS_INO_LAYOUTCOMMIT	(9)		/* layoutcommit required */
 #define NFS_INO_LAYOUTCOMMITTING (10)		/* layoutcommit inflight */
 #define NFS_INO_LAYOUTSTATS	(11)		/* layoutstats inflight */

 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 {
 	return container_of(inode, struct nfs_inode, vfs_inode);
 }

 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 {
 	return (struct nfs_server *)(s->s_fs_info);
 }

 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 {
 	return &NFS_I(inode)->fh;
 }

 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 {
 	return NFS_SB(inode->i_sb);
 }

 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 {
 	return NFS_SERVER(inode)->client;
 }

 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 {
 	return NFS_SERVER(inode)->nfs_client->rpc_ops;
 }

 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 {
 	struct nfs_server *nfss = NFS_SERVER(inode);
 	return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 }

 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 {
 	struct nfs_server *nfss = NFS_SERVER(inode);
 	return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 }

 static inline int NFS_STALE(const struct inode *inode)
 {
 	return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 }

 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
 {
 #ifdef CONFIG_NFS_FSCACHE
 	return NFS_I(inode)->fscache;
 #else
 	return NULL;
 #endif
 }

 static inline __u64 NFS_FILEID(const struct inode *inode)
 {
 	return NFS_I(inode)->fileid;
 }

 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 {
 	NFS_I(inode)->fileid = fileid;
 }

 static inline void nfs_mark_for_revalidate(struct inode *inode)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);

 	spin_lock(&inode->i_lock);
 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
 				NFS_INO_REVAL_PAGECACHE |
 				NFS_INO_INVALID_ACCESS |
 				NFS_INO_INVALID_ACL;
 	if (S_ISDIR(inode->i_mode))
 		nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 	spin_unlock(&inode->i_lock);
 }

 static inline int nfs_server_capable(struct inode *inode, int cap)
 {
 	return NFS_SERVER(inode)->caps & cap;
 }

 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 {
 	dentry->d_time = verf;
 }

 /**
  * nfs_save_change_attribute - Returns the inode attribute change cookie
  * @dir - pointer to parent directory inode
  * The "change attribute" is updated every time we finish an operation
  * that will result in a metadata change on the server.
  */
 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 {
 	return NFS_I(dir)->cache_change_attribute;
 }

 /**
  * nfs_verify_change_attribute - Detects NFS remote directory changes
  * @dir - pointer to parent directory inode
  * @chattr - previously saved change attribute
  * Return "false" if the verifiers doesn't match the change attribute.
  * This would usually indicate that the directory contents have changed on
  * the server, and that any dentries need revalidating.
  */
 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 {
 	return chattr == NFS_I(dir)->cache_change_attribute;
 }

 /*
  * linux/fs/nfs/inode.c
  */
 extern int nfs_sync_mapping(struct address_space *mapping);
 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 extern void nfs_zap_caches(struct inode *);
 extern void nfs_invalidate_atime(struct inode *);
 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 				struct nfs_fattr *, struct nfs4_label *);
 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
 extern int nfs_permission(struct inode *, int);
 extern int nfs_open(struct inode *, struct file *);
 extern int nfs_attribute_timeout(struct inode *inode);
 extern int nfs_attribute_cache_expired(struct inode *inode);
 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 extern int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode);
 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
 extern int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping);
 extern int nfs_setattr(struct dentry *, struct iattr *);
 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 				struct nfs4_label *label);
 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 extern void nfs_file_clear_open_context(struct file *flip);
 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
 extern u64 nfs_compat_user_ino64(u64 fileid);
 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
 extern unsigned long nfs_inc_attr_generation_counter(void);

 extern struct nfs_fattr *nfs_alloc_fattr(void);

 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
 {
 	kfree(fattr);
 }

 extern struct nfs_fh *nfs_alloc_fhandle(void);

 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 {
 	kfree(fh);
 }

 #ifdef NFS_DEBUG
 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 {
 	return _nfs_display_fhandle_hash(fh);
 }
 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
 #define nfs_display_fhandle(fh, caption)			\
 	do {							\
 		if (unlikely(nfs_debug & NFSDBG_FACILITY))	\
 			_nfs_display_fhandle(fh, caption);	\
 	} while (0)
 #else
 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 {
 	return 0;
 }
 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
 				       const char *caption)
 {
 }
 #endif

 /*
  * linux/fs/nfs/nfsroot.c
  */
 extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 extern __be32 root_nfs_parse_addr(char *name); /*__init*/

 /*
  * linux/fs/nfs/file.c
  */
 extern const struct file_operations nfs_file_operations;
 #if IS_ENABLED(CONFIG_NFS_V4)
 extern const struct file_operations nfs4_file_operations;
 #endif /* CONFIG_NFS_V4 */
 extern const struct address_space_operations nfs_file_aops;
 extern const struct address_space_operations nfs_dir_aops;

 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 {
 	return filp->private_data;
 }

 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 {
 	if (file != NULL) {
 		struct nfs_open_context *ctx =
 			nfs_file_open_context(file);
 		if (ctx)
 			return ctx->cred;
 	}
 	return NULL;
 }

 /*
  * linux/fs/nfs/direct.c
  */
 extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *, loff_t);
 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 			struct iov_iter *iter,
 			loff_t pos);
 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 			struct iov_iter *iter);

 /*
  * linux/fs/nfs/dir.c
  */
 extern const struct file_operations nfs_dir_operations;
 extern const struct dentry_operations nfs_dentry_operations;

 extern void nfs_force_lookup_revalidate(struct inode *dir);
 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
 			struct nfs_fattr *fattr, struct nfs4_label *label);
 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 extern void nfs_access_zap_cache(struct inode *inode);

 /*
  * linux/fs/nfs/symlink.c
  */
 extern const struct inode_operations nfs_symlink_inode_operations;

 /*
  * linux/fs/nfs/sysctl.c
  */
 #ifdef CONFIG_SYSCTL
 extern int nfs_register_sysctl(void);
 extern void nfs_unregister_sysctl(void);
 #else
 #define nfs_register_sysctl() 0
 #define nfs_unregister_sysctl() do { } while(0)
 #endif

 /*
  * linux/fs/nfs/namespace.c
  */
 extern const struct inode_operations nfs_mountpoint_inode_operations;
 extern const struct inode_operations nfs_referral_inode_operations;
 extern int nfs_mountpoint_expiry_timeout;
 extern void nfs_release_automount_timer(void);

 /*
  * linux/fs/nfs/unlink.c
  */
 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 extern void nfs_wait_on_sillyrename(struct dentry *dentry);
 extern void nfs_block_sillyrename(struct dentry *dentry);
 extern void nfs_unblock_sillyrename(struct dentry *dentry);

 /*
  * linux/fs/nfs/write.c
  */
 extern int  nfs_congestion_kb;
 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);

 /*
  * Try to write back everything synchronously (but check the
  * return value!)
  */
 extern int nfs_sync_inode(struct inode *inode);
 extern int nfs_wb_all(struct inode *inode);
 extern int nfs_wb_single_page(struct inode *inode, struct page *page, bool launder);
 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 extern int  nfs_commit_inode(struct inode *, int);
 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
 extern void nfs_commit_free(struct nfs_commit_data *data);

 static inline int
 nfs_wb_launder_page(struct inode *inode, struct page *page)
 {
 	return nfs_wb_single_page(inode, page, true);
 }

 static inline int
 nfs_wb_page(struct inode *inode, struct page *page)
 {
 	return nfs_wb_single_page(inode, page, false);
 }

 static inline int
 nfs_have_writebacks(struct inode *inode)
 {
 	return NFS_I(inode)->nrequests != 0;
 }

 /*
  * linux/fs/nfs/read.c
  */
 extern int  nfs_readpage(struct file *, struct page *);
 extern int  nfs_readpages(struct file *, struct address_space *,
 		struct list_head *, unsigned);
 extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
 			       struct page *);

 /*
  * inline functions
  */

 static inline loff_t nfs_size_to_loff_t(__u64 size)
 {
 	if (size > (__u64) OFFSET_MAX - 1)
 		return OFFSET_MAX - 1;
 	return (loff_t) size;
 }

 static inline ino_t
 nfs_fileid_to_ino_t(u64 fileid)
 {
 	ino_t ino = (ino_t) fileid;
 	if (sizeof(ino_t) < sizeof(u64))
 		ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 	return ino;
 }

 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)


 # undef ifdebug
 # ifdef NFS_DEBUG
 #  define ifdebug(fac)		if (unlikely(nfs_debug & NFSDBG_##fac))
 #  define NFS_IFDEBUG(x)	x
 # else
 #  define ifdebug(fac)		if (0)
 #  define NFS_IFDEBUG(x)
 # endif
 #endif
	/*
	* linux/include/linux/nfs_fs.h
	*
	* Copyright (C) 1992 Rick Sladkey
	*
	* OS-specific nfs filesystem definitions and declarations
	*/
	#ifndef _LINUX_NFS_FS_H
	#define _LINUX_NFS_FS_H

	#include <uapi/linux/nfs_fs.h>


	/*
	* Enable dprintk() debugging support for nfs client.
	*/
	#ifdef CONFIG_NFS_DEBUG
	# define NFS_DEBUG
	#endif

	#include <linux/in.h>
	#include <linux/mm.h>
	#include <linux/pagemap.h>
	#include <linux/rbtree.h>
	#include <linux/rwsem.h>
	#include <linux/wait.h>

	#include <linux/sunrpc/debug.h>
	#include <linux/sunrpc/auth.h>
	#include <linux/sunrpc/clnt.h>

	#include <linux/nfs.h>
	#include <linux/nfs2.h>
	#include <linux/nfs3.h>
	#include <linux/nfs4.h>
	#include <linux/nfs_xdr.h>
	#include <linux/nfs_fs_sb.h>

	#include <linux/mempool.h>

	/*
	* These are the default flags for swap requests
	*/
	#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER\|RPC_TASK_ROOTCREDS)

	/*
	* NFSv3/v4 Access mode cache entry
	*/
	struct nfs_access_entry {
	struct rb_node rb_node;
	struct list_head lru;
	unsigned long jiffies;
	struct rpc_cred * cred;
	int mask;
	struct rcu_head rcu_head;
	};

	struct nfs_lockowner {
	fl_owner_t l_owner;
	pid_t l_pid;
	};

	struct nfs_lock_context {
	atomic_t count;
	struct list_head list;
	struct nfs_open_context *open_context;
	struct nfs_lockowner lockowner;
	atomic_t io_count;
	};

	struct nfs4_state;
	struct nfs_open_context {
	struct nfs_lock_context lock_context;
	struct dentry *dentry;
	struct rpc_cred *cred;
	struct nfs4_state *state;
	fmode_t mode;

	unsigned long flags;
	#define NFS_CONTEXT_ERROR_WRITE (0)
	#define NFS_CONTEXT_RESEND_WRITES (1)
	#define NFS_CONTEXT_BAD (2)
	int error;

	struct list_head list;
	struct nfs4_threshold *mdsthreshold;
	};

	struct nfs_open_dir_context {
	struct list_head list;
	struct rpc_cred *cred;
	unsigned long attr_gencount;
	__u64 dir_cookie;
	__u64 dup_cookie;
	signed char duped;
	};

	/*
	* NFSv4 delegation
	*/
	struct nfs_delegation;

	struct posix_acl;

	/*
	* nfs fs inode data in memory
	*/
	struct nfs_inode {
	/*
	* The 64bit 'inode number'
	*/
	__u64 fileid;

	/*
	* NFS file handle
	*/
	struct nfs_fh fh;

	/*
	* Various flags
	*/
	unsigned long flags; /* atomic bit ops */
	unsigned long cache_validity; /* bit mask */

	/*
	* read_cache_jiffies is when we started read-caching this inode.
	* attrtimeo is for how long the cached information is assumed
	* to be valid. A successful attribute revalidation doubles
	* attrtimeo (up to acregmax/acdirmax), a failure resets it to
	* acregmin/acdirmin.
	*
	* We need to revalidate the cached attrs for this inode if
	*
	* jiffies - read_cache_jiffies >= attrtimeo
	*
	* Please note the comparison is greater than or equal
	* so that zero timeout values can be specified.
	*/
	unsigned long read_cache_jiffies;
	unsigned long attrtimeo;
	unsigned long attrtimeo_timestamp;

	unsigned long attr_gencount;
	/* "Generation counter" for the attribute cache. This is
	* bumped whenever we update the metadata on the
	* server.
	*/
	unsigned long cache_change_attribute;

	struct rb_root access_cache;
	struct list_head access_cache_entry_lru;
	struct list_head access_cache_inode_lru;

	/*
	* This is the cookie verifier used for NFSv3 readdir
	* operations
	*/
	__be32 cookieverf[2];

	unsigned long nrequests;
	struct nfs_mds_commit_info commit_info;

	/* Open contexts for shared mmap writes */
	struct list_head open_files;

	/* Number of in-flight sillydelete RPC calls */
	atomic_t silly_count;
	/* List of deferred sillydelete requests */
	struct hlist_head silly_list;
	wait_queue_head_t waitqueue;

	#if IS_ENABLED(CONFIG_NFS_V4)
	struct nfs4_cached_acl *nfs4_acl;
	/* NFSv4 state */
	struct list_head open_states;
	struct nfs_delegation __rcu *delegation;
	struct rw_semaphore rwsem;

	/* pNFS layout information */
	struct pnfs_layout_hdr *layout;
	#endif /* CONFIG_NFS_V4*/
	/* how many bytes have been written/read and how many bytes queued up */
	__u64 write_io;
	__u64 read_io;
	#ifdef CONFIG_NFS_FSCACHE
	struct fscache_cookie *fscache;
	#endif
	struct inode vfs_inode;
	};

	/*
	* Cache validity bit flags
	*/
	#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
	#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
	#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
	#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
	#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
	#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
	#define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
	#define NFS_INO_INVALID_LABEL 0x0080 /* cached label is invalid */

	/*
	* Bit offsets in flags field
	*/
	#define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
	#define NFS_INO_STALE (1) /* possible stale inode */
	#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
	#define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
	#define NFS_INO_FLUSHING (4) /* inode is flushing out data */
	#define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
	#define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
	#define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
	#define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
	#define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */

	static inline struct nfs_inode NFS_I(const struct inode inode)
	{
	return container_of(inode, struct nfs_inode, vfs_inode);
	}

	static inline struct nfs_server NFS_SB(const struct super_block s)
	{
	return (struct nfs_server *)(s->s_fs_info);
	}

	static inline struct nfs_fh NFS_FH(const struct inode inode)
	{
	return &NFS_I(inode)->fh;
	}

	static inline struct nfs_server NFS_SERVER(const struct inode inode)
	{
	return NFS_SB(inode->i_sb);
	}

	static inline struct rpc_clnt NFS_CLIENT(const struct inode inode)
	{
	return NFS_SERVER(inode)->client;
	}

	static inline const struct nfs_rpc_ops NFS_PROTO(const struct inode inode)
	{
	return NFS_SERVER(inode)->nfs_client->rpc_ops;
	}

	static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
	{
	struct nfs_server *nfss = NFS_SERVER(inode);
	return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
	}

	static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
	{
	struct nfs_server *nfss = NFS_SERVER(inode);
	return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
	}

	static inline int NFS_STALE(const struct inode *inode)
	{
	return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
	}

	static inline struct fscache_cookie nfs_i_fscache(struct inode inode)
	{
	#ifdef CONFIG_NFS_FSCACHE
	return NFS_I(inode)->fscache;
	#else
	return NULL;
	#endif
	}

	static inline __u64 NFS_FILEID(const struct inode *inode)
	{
	return NFS_I(inode)->fileid;
	}

	static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
	{
	NFS_I(inode)->fileid = fileid;
	}

	static inline void nfs_mark_for_revalidate(struct inode *inode)
	{
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	nfsi->cache_validity \|= NFS_INO_INVALID_ATTR \|
	NFS_INO_REVAL_PAGECACHE \|
	NFS_INO_INVALID_ACCESS \|
	NFS_INO_INVALID_ACL;
	if (S_ISDIR(inode->i_mode))
	nfsi->cache_validity \|= NFS_INO_INVALID_DATA;
	spin_unlock(&inode->i_lock);
	}

	static inline int nfs_server_capable(struct inode *inode, int cap)
	{
	return NFS_SERVER(inode)->caps & cap;
	}

	static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
	{
	dentry->d_time = verf;
	}

	/**
	* nfs_save_change_attribute - Returns the inode attribute change cookie
	* @dir - pointer to parent directory inode
	* The "change attribute" is updated every time we finish an operation
	* that will result in a metadata change on the server.
	*/
	static inline unsigned long nfs_save_change_attribute(struct inode *dir)
	{
	return NFS_I(dir)->cache_change_attribute;
	}

	/**
	* nfs_verify_change_attribute - Detects NFS remote directory changes
	* @dir - pointer to parent directory inode
	* @chattr - previously saved change attribute
	* Return "false" if the verifiers doesn't match the change attribute.
	* This would usually indicate that the directory contents have changed on
	* the server, and that any dentries need revalidating.
	*/
	static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
	{
	return chattr == NFS_I(dir)->cache_change_attribute;
	}

	/*
	* linux/fs/nfs/inode.c
	*/
	extern int nfs_sync_mapping(struct address_space *mapping);
	extern void nfs_zap_mapping(struct inode inode, struct address_space mapping);
	extern void nfs_zap_caches(struct inode *);
	extern void nfs_invalidate_atime(struct inode *);
	extern struct inode nfs_fhget(struct super_block , struct nfs_fh *,
	struct nfs_fattr , struct nfs4_label );
	extern int nfs_refresh_inode(struct inode , struct nfs_fattr );
	extern int nfs_post_op_update_inode(struct inode inode, struct nfs_fattr fattr);
	extern int nfs_post_op_update_inode_force_wcc(struct inode inode, struct nfs_fattr fattr);
	extern int nfs_post_op_update_inode_force_wcc_locked(struct inode inode, struct nfs_fattr fattr);
	extern int nfs_getattr(struct vfsmount , struct dentry , struct kstat *);
	extern void nfs_access_add_cache(struct inode , struct nfs_access_entry );
	extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
	extern int nfs_permission(struct inode *, int);
	extern int nfs_open(struct inode , struct file );
	extern int nfs_attribute_timeout(struct inode *inode);
	extern int nfs_attribute_cache_expired(struct inode *inode);
	extern int nfs_revalidate_inode(struct nfs_server server, struct inode inode);
	extern int nfs_revalidate_inode_rcu(struct nfs_server server, struct inode inode);
	extern int __nfs_revalidate_inode(struct nfs_server , struct inode );
	extern int nfs_revalidate_mapping(struct inode inode, struct address_space mapping);
	extern int nfs_revalidate_mapping_rcu(struct inode *inode);
	extern int nfs_revalidate_mapping_protected(struct inode inode, struct address_space mapping);
	extern int nfs_setattr(struct dentry , struct iattr );
	extern void nfs_setattr_update_inode(struct inode inode, struct iattr attr, struct nfs_fattr *);
	extern void nfs_setsecurity(struct inode inode, struct nfs_fattr fattr,
	struct nfs4_label *label);
	extern struct nfs_open_context get_nfs_open_context(struct nfs_open_context ctx);
	extern void put_nfs_open_context(struct nfs_open_context *ctx);
	extern struct nfs_open_context nfs_find_open_context(struct inode inode, struct rpc_cred *cred, fmode_t mode);
	extern struct nfs_open_context alloc_nfs_open_context(struct dentry dentry, fmode_t f_mode);
	extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
	extern void nfs_file_set_open_context(struct file filp, struct nfs_open_context ctx);
	extern void nfs_file_clear_open_context(struct file *flip);
	extern struct nfs_lock_context nfs_get_lock_context(struct nfs_open_context ctx);
	extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
	extern u64 nfs_compat_user_ino64(u64 fileid);
	extern void nfs_fattr_init(struct nfs_fattr *fattr);
	extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
	extern unsigned long nfs_inc_attr_generation_counter(void);

	extern struct nfs_fattr *nfs_alloc_fattr(void);

	static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
	{
	kfree(fattr);
	}

	extern struct nfs_fh *nfs_alloc_fhandle(void);

	static inline void nfs_free_fhandle(const struct nfs_fh *fh)
	{
	kfree(fh);
	}

	#ifdef NFS_DEBUG
	extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
	static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
	{
	return _nfs_display_fhandle_hash(fh);
	}
	extern void _nfs_display_fhandle(const struct nfs_fh fh, const char caption);
	#define nfs_display_fhandle(fh, caption) \
	do { \
	if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
	_nfs_display_fhandle(fh, caption); \
	} while (0)
	#else
	static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
	{
	return 0;
	}
	static inline void nfs_display_fhandle(const struct nfs_fh *fh,
	const char *caption)
	{
	}
	#endif

	/*
	* linux/fs/nfs/nfsroot.c
	*/
	extern int nfs_root_data(char root_device, char root_data); /__init/
	/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
	extern __be32 root_nfs_parse_addr(char name); /__init*/

	/*
	* linux/fs/nfs/file.c
	*/
	extern const struct file_operations nfs_file_operations;
	#if IS_ENABLED(CONFIG_NFS_V4)
	extern const struct file_operations nfs4_file_operations;
	#endif /* CONFIG_NFS_V4 */
	extern const struct address_space_operations nfs_file_aops;
	extern const struct address_space_operations nfs_dir_aops;

	static inline struct nfs_open_context nfs_file_open_context(struct file filp)
	{
	return filp->private_data;
	}

	static inline struct rpc_cred nfs_file_cred(struct file file)
	{
	if (file != NULL) {
	struct nfs_open_context *ctx =
	nfs_file_open_context(file);
	if (ctx)
	return ctx->cred;
	}
	return NULL;
	}

	/*
	* linux/fs/nfs/direct.c
	*/
	extern ssize_t nfs_direct_IO(struct kiocb , struct iov_iter , loff_t);
	extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
	struct iov_iter *iter,
	loff_t pos);
	extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
	struct iov_iter *iter);

	/*
	* linux/fs/nfs/dir.c
	*/
	extern const struct file_operations nfs_dir_operations;
	extern const struct dentry_operations nfs_dentry_operations;

	extern void nfs_force_lookup_revalidate(struct inode *dir);
	extern int nfs_instantiate(struct dentry dentry, struct nfs_fh fh,
	struct nfs_fattr fattr, struct nfs4_label label);
	extern int nfs_may_open(struct inode inode, struct rpc_cred cred, int openflags);
	extern void nfs_access_zap_cache(struct inode *inode);

	/*
	* linux/fs/nfs/symlink.c
	*/
	extern const struct inode_operations nfs_symlink_inode_operations;

	/*
	* linux/fs/nfs/sysctl.c
	*/
	#ifdef CONFIG_SYSCTL
	extern int nfs_register_sysctl(void);
	extern void nfs_unregister_sysctl(void);
	#else
	#define nfs_register_sysctl() 0
	#define nfs_unregister_sysctl() do { } while(0)
	#endif

	/*
	* linux/fs/nfs/namespace.c
	*/
	extern const struct inode_operations nfs_mountpoint_inode_operations;
	extern const struct inode_operations nfs_referral_inode_operations;
	extern int nfs_mountpoint_expiry_timeout;
	extern void nfs_release_automount_timer(void);

	/*
	* linux/fs/nfs/unlink.c
	*/
	extern void nfs_complete_unlink(struct dentry dentry, struct inode );
	extern void nfs_wait_on_sillyrename(struct dentry *dentry);
	extern void nfs_block_sillyrename(struct dentry *dentry);
	extern void nfs_unblock_sillyrename(struct dentry *dentry);

	/*
	* linux/fs/nfs/write.c
	*/
	extern int nfs_congestion_kb;
	extern int nfs_writepage(struct page page, struct writeback_control wbc);
	extern int nfs_writepages(struct address_space , struct writeback_control );
	extern int nfs_flush_incompatible(struct file file, struct page page);
	extern int nfs_updatepage(struct file , struct page , unsigned int, unsigned int);

	/*
	* Try to write back everything synchronously (but check the
	* return value!)
	*/
	extern int nfs_sync_inode(struct inode *inode);
	extern int nfs_wb_all(struct inode *inode);
	extern int nfs_wb_single_page(struct inode inode, struct page page, bool launder);
	extern int nfs_wb_page_cancel(struct inode inode, struct page page);
	extern int nfs_commit_inode(struct inode *, int);
	extern struct nfs_commit_data *nfs_commitdata_alloc(void);
	extern void nfs_commit_free(struct nfs_commit_data *data);

	static inline int
	nfs_wb_launder_page(struct inode inode, struct page page)
	{
	return nfs_wb_single_page(inode, page, true);
	}

	static inline int
	nfs_wb_page(struct inode inode, struct page page)
	{
	return nfs_wb_single_page(inode, page, false);
	}

	static inline int
	nfs_have_writebacks(struct inode *inode)
	{
	return NFS_I(inode)->nrequests != 0;
	}

	/*
	* linux/fs/nfs/read.c
	*/
	extern int nfs_readpage(struct file , struct page );
	extern int nfs_readpages(struct file , struct address_space ,
	struct list_head *, unsigned);
	extern int nfs_readpage_async(struct nfs_open_context , struct inode ,
	struct page *);

	/*
	* inline functions
	*/

	static inline loff_t nfs_size_to_loff_t(__u64 size)
	{
	if (size > (__u64) OFFSET_MAX - 1)
	return OFFSET_MAX - 1;
	return (loff_t) size;
	}

	static inline ino_t
	nfs_fileid_to_ino_t(u64 fileid)
	{
	ino_t ino = (ino_t) fileid;
	if (sizeof(ino_t) < sizeof(u64))
	ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	return ino;
	}

	#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)


	# undef ifdebug
	# ifdef NFS_DEBUG
	# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
	# define NFS_IFDEBUG(x) x
	# else
	# define ifdebug(fac) if (0)
	# define NFS_IFDEBUG(x)
	# endif
	#endif