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     €ЗН„iпЖДЛ ?ч     /* SPDX-License-Identifier: GPL-2.0 */
/*
 *  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/refcount.h>
#include <linux/rwsem.h>
#include <linux/wait.h>

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

#ifdef CONFIG_NFS_FSCACHE
#include <linux/netfs.h>
#endif

#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 for number of transports to different server IPs
 */
#define NFS_MAX_TRANSPORTS 16

/*
 * Size of the NFS directory verifier
 */
#define NFS_DIR_VERIFIER_SIZE		2

/*
 * NFSv3/v4 Access mode cache entry
 */
struct nfs_access_entry {
	struct rb_node		rb_node;
	struct list_head	lru;
	kuid_t			fsuid;
	kgid_t			fsgid;
	struct group_info	*group_info;
	u64			timestamp;
	__u32			mask;
	struct rcu_head		rcu_head;
};

struct nfs_lock_context {
	refcount_t count;
	struct list_head list;
	struct nfs_open_context *open_context;
	fl_owner_t lockowner;
	atomic_t io_count;
	struct rcu_head	rcu_head;
};

struct nfs4_state;
struct nfs_open_context {
	struct nfs_lock_context lock_context;
	fl_owner_t flock_owner;
	struct dentry *dentry;
	const struct cred *cred;
	struct rpc_cred __rcu *ll_cred;	/* low-level cred - use to check for expiry */
	struct nfs4_state *state;
	fmode_t mode;

	unsigned long flags;
#define NFS_CONTEXT_BAD			(2)
#define NFS_CONTEXT_UNLOCK	(3)
#define NFS_CONTEXT_FILE_OPEN		(4)
	int error;

	struct list_head list;
	struct nfs4_threshold	*mdsthreshold;
	struct rcu_head	rcu_head;
};

struct nfs_open_dir_context {
	struct list_head list;
	atomic_t cache_hits;
	atomic_t cache_misses;
	unsigned long attr_gencount;
	__be32	verf[NFS_DIR_VERIFIER_SIZE];
	__u64 dir_cookie;
	__u64 last_cookie;
	pgoff_t page_index;
	unsigned int dtsize;
	bool force_clear;
	bool eof;
	struct rcu_head rcu_head;
};

/*
 * NFSv4 delegation
 */
struct nfs_delegation;

struct posix_acl;

struct nfs4_xattr_cache;

/*
 * 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 */

	/*
	 * NFS Attributes not included in struct inode
	 */

	struct timespec64	btime;

	/*
	 * 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;

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

	union {
		/* Directory */
		struct {
			/* "Generation counter" for the attribute cache.
			 * This is bumped whenever we update the metadata
			 * on the server.
			 */
			unsigned long	cache_change_attribute;
			/*
			 * This is the cookie verifier used for NFSv3 readdir
			 * operations
			 */
			__be32		cookieverf[NFS_DIR_VERIFIER_SIZE];
			/* Readers: in-flight sillydelete RPC calls */
			/* Writers: rmdir */
			struct rw_semaphore	rmdir_sem;
		};
		/* Regular file */
		struct {
			atomic_long_t	nreque