path: root/include/linux/nfs_fs.h

/* 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>

#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)

/*
 * 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;
	const struct cred *	cred;
	__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 *ll_cred;	/* low-level cred - use to check for expiry */
	struct nfs4_state *state;
	fmode_t mode;

	unsigned long flags;
#define NFS_CONTEXT_RESEND_WRITES	(1)
#define NFS_CONTEXT_BAD			(2)
#define NFS_CONTEXT_UNLOCK	(3)
	int error;

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

struct nfs_open_dir_context {
	struct list_head list;
	unsigned long attr_gencount;
	__be32	verf[NFS_DIR_VERIFIER_SIZE];
	__u64 dir_cookie;
	__u64 dup_cookie;
	signed char duped;
};

/*
 * 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 */

	/*
	 * 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[NFS_DIR_VERIFIER_SIZE];

	atomic_long_t		nrequests;
	struct nfs_mds_commit_info commit_info;

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

	/* Readers: in-flight sillydelete RPC calls */
	/* Writers: rmdir */
	struct rw_semaphore	rmdir_sem;
	struct mutex		commit_mutex;

	/* track last access to cached pages */
	unsigned long		page_index;

#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;

#ifdef CONFIG_NFS_V4_2
	struct nfs4_xattr_cache *xattr_cache;
#endif
};

struct nfs4_copy_state {
	struct list_head	copies;
	struct list_head	src_copies;
	nfs4_stateid		stateid;
	struct completion	completion;
	uint64_t		count;
	struct nfs_writeverf	verf;
	int			error;
	int			flags;
	struct nfs4_state	*parent_src_state;
	struct nfs4_state	*parent_dst_state;
};

/*
 * Access bit flags
 */
#define NFS_ACCESS_READ        0x0001
#define NFS_ACCESS_LOOKUP      0x0002
#define NFS_ACCESS_MODIFY      0x0004
#define NFS_ACCESS_EXTEND      0x0008
#define NFS_ACCESS_DELETE      0x0010
#define NFS_ACCESS_EXECUTE     0x0020
#define NFS_ACCESS_XAREAD      0x0040
#define NFS_ACCESS_XAWRITE     0x0080
#define NFS_ACCESS_XALIST      0x0100

/*
 * Cache validity bit flags
 */
#define NFS_INO_INVALID_DATA	BIT(1)		/* cached data is invalid */
#define NFS_INO_INVALID_ATIME	BIT(2)		/* cached atime is invalid */
#define NFS_INO_INVALID_ACCESS	BIT(3)		/* cached access cred invalid */
#define NFS_INO_INVALID_ACL	BIT(4)		/* cached acls are invalid */
#define NFS_INO_REVAL_PAGECACHE	BIT(5)		/* must revalidate pagecache */
#define NFS_INO_REVAL_FORCED	BIT(6)		/* force revalidation ignoring a delegation */
#define NFS_INO_INVALID_LABEL	BIT(7)		/* cached label is invalid */
#define NFS_INO_INVALID_CHANGE	BIT(8)		/* cached change is invalid */
#define NFS_INO_INVALID_CTIME	BIT(9)		/* cached ctime is invalid */
#define NFS_INO_INVALID_MTIME	BIT(10)		/* cached mtime is invalid */
#define NFS_INO_INVALID_SIZE	BIT(11)		/* cached size is invalid */
#define NFS_INO_INVALID_OTHER	BIT(12)		/* other attrs are invalid */
#define NFS_INO_DATA_INVAL_DEFER	\
				BIT(13)		/* Deferred cache invalidation */
#define NFS_INO_INVALID_BLOCKS	BIT(14)         /* cached blocks are invalid */
#define NFS_INO_INVALID_XATTR	BIT(15)		/* xattrs are invalid */

#define NFS_INO_INVALID_ATTR	(NFS_INO_INVALID_CHANGE \
		| NFS_INO_INVALID_CTIME \
		| NFS_INO_INVALID_MTIME \
		| NFS_INO_INVALID_SIZE \
		| NFS_INO_INVALID_OTHER)	/* inode metadata 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_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 */
#define NFS_INO_ODIRECT		(12)		/* I/O setting is O_DIRECT */

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 =