Linux-2.6.12-rc2

[mirror_ubuntu-zesty-kernel.git] / include / linux / nfs_fs.h

/*
 *  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 <linux/config.h>
#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rwsem.h>
#include <linux/wait.h>
#include <linux/uio.h>

#include <linux/nfs_fs_sb.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/rwsem.h>
#include <linux/workqueue.h>
#include <linux/mempool.h>

/*
 * Enable debugging support for nfs client.
 * Requires RPC_DEBUG.
 */
#ifdef RPC_DEBUG
# define NFS_DEBUG
#endif

#define NFS_MAX_FILE_IO_BUFFER_SIZE     32768
#define NFS_DEF_FILE_IO_BUFFER_SIZE     4096

/*
 * The upper limit on timeouts for the exponential backoff algorithm.
 */
#define NFS_WRITEBACK_DELAY             (5*HZ)
#define NFS_WRITEBACK_LOCKDELAY         (60*HZ)
#define NFS_COMMIT_DELAY                (5*HZ)

/*
 * superblock magic number for NFS
 */
#define NFS_SUPER_MAGIC                 0x6969

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

#define NFS_RW_SYNC             0x0001  /* O_SYNC handling */
#define NFS_RW_SWAP             0x0002  /* This is a swap request */

/*
 * When flushing a cluster of dirty pages, there can be different
 * strategies:
 */
#define FLUSH_AGING             0       /* only flush old buffers */
#define FLUSH_SYNC              1       /* file being synced, or contention */
#define FLUSH_WAIT              2       /* wait for completion */
#define FLUSH_STABLE            4       /* commit to stable storage */
#define FLUSH_LOWPRI            8       /* low priority background flush */
#define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */

#ifdef __KERNEL__

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

struct nfs4_state;
struct nfs_open_context {
        atomic_t count;
        struct dentry *dentry;
        struct rpc_cred *cred;
        struct nfs4_state *state;
        fl_owner_t lockowner;
        int mode;
        int error;

        struct list_head list;
        wait_queue_head_t waitq;
};

/*
 * NFSv4 delegation
 */
struct nfs_delegation;

/*
 * 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 int            flags;

        /*
         * read_cache_jiffies is when we started read-caching this inode,
         * and read_cache_mtime is the mtime of the inode at that time.
         * 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
         *
         * and invalidate any cached data/flush out any dirty pages if
         * we find that
         *
         *      mtime != read_cache_mtime
         */
        unsigned long           readdir_timestamp;
        unsigned long           read_cache_jiffies;
        unsigned long           attrtimeo;
        unsigned long           attrtimeo_timestamp;
        __u64                   change_attr;            /* v4 only */

        /* "Generation counter" for the attribute cache. This is
         * bumped whenever we update the metadata on the
         * server.
         */
        unsigned long           cache_change_attribute;
        /*
         * Counter indicating the number of outstanding requests that
         * will cause a file data update.
         */
        atomic_t                data_updates;

        struct nfs_access_entry cache_access;

        /*
         * This is the cookie verifier used for NFSv3 readdir
         * operations
         */
        __u32                   cookieverf[2];

        /*
         * This is the list of dirty unwritten pages.
         */
        spinlock_t              req_lock;
        struct list_head        dirty;
        struct list_head        commit;
        struct radix_tree_root  nfs_page_tree;

        unsigned int            ndirty,
                                ncommit,
                                npages;

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

        wait_queue_head_t       nfs_i_wait;

#ifdef CONFIG_NFS_V4
        /* NFSv4 state */
        struct list_head        open_states;
        struct nfs_delegation   *delegation;
        int                      delegation_state;
        struct rw_semaphore     rwsem;
#endif /* CONFIG_NFS_V4*/

        struct inode            vfs_inode;
};

/*
 * Legal inode flag values
 */
#define NFS_INO_STALE           0x0001          /* possible stale inode */
#define NFS_INO_ADVISE_RDPLUS   0x0002          /* advise readdirplus */
#define NFS_INO_REVALIDATING    0x0004          /* revalidating attrs */
#define NFS_INO_INVALID_ATTR    0x0008          /* cached attrs are invalid */
#define NFS_INO_INVALID_DATA    0x0010          /* cached data is invalid */
#define NFS_INO_INVALID_ATIME   0x0020          /* cached atime is invalid */
#define NFS_INO_INVALID_ACCESS  0x0040          /* cached access cred invalid */

static inline struct nfs_inode *NFS_I(struct inode *inode)
{
        return container_of(inode, struct nfs_inode, vfs_inode);
}
#define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))

#define NFS_FH(inode)                   (&NFS_I(inode)->fh)
#define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
#define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
#define NFS_PROTO(inode)                (NFS_SERVER(inode)->rpc_ops)
#define NFS_ADDR(inode)                 (RPC_PEERADDR(NFS_CLIENT(inode)))
#define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
#define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
#define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
#define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
#define NFS_MINATTRTIMEO(inode) \
        (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
                               : NFS_SERVER(inode)->acregmin)
#define NFS_MAXATTRTIMEO(inode) \
        (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
                               : NFS_SERVER(inode)->acregmax)
#define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)

#define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
#define NFS_REVALIDATING(inode)         (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
#define NFS_STALE(inode)                (NFS_FLAGS(inode) & NFS_INO_STALE)

#define NFS_FILEID(inode)               (NFS_I(inode)->fileid)

static inline int nfs_caches_unstable(struct inode *inode)
{
        return atomic_read(&NFS_I(inode)->data_updates) != 0;
}

static inline void NFS_CACHEINV(struct inode *inode)
{
        if (!nfs_caches_unstable(inode))
                NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
}

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

static inline int NFS_USE_READDIRPLUS(struct inode *inode)
{
        return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
}

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

/**
 * nfs_verify_change_attribute - Detects NFS inode cache updates
 * @inode - pointer to inode
 * @chattr - previously saved change attribute
 * Return "false" if metadata has been updated (or is in the process of
 * being updated) since the change attribute was saved.
 */
static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
{
        return !nfs_caches_unstable(inode)
                && chattr == NFS_I(inode)->cache_change_attribute;
}

/*
 * linux/fs/nfs/inode.c
 */
extern void nfs_zap_caches(struct inode *);
extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
                                struct nfs_fattr *);
extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int nfs_permission(struct inode *, int, struct nameidata *);
extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_release(struct inode *, struct file *);
extern int nfs_attribute_timeout(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);
extern void nfs_end_data_update(struct inode *);
extern void nfs_end_data_update_defer(struct inode *);
extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
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 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
extern void nfs_file_clear_open_context(struct file *filp);

/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern u32 root_nfs_parse_addr(char *name); /*__init*/

/*
 * linux/fs/nfs/file.c
 */
extern struct inode_operations nfs_file_inode_operations;
extern struct file_operations nfs_file_operations;
extern struct address_space_operations nfs_file_aops;

static inline struct rpc_cred *nfs_file_cred(struct file *file)
{
        if (file != NULL) {
                struct nfs_open_context *ctx;

                ctx = (struct nfs_open_context*)file->private_data;
                return ctx->cred;
        }
        return NULL;
}

/*
 * linux/fs/nfs/direct.c
 */
extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
                        unsigned long);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
                        size_t count, loff_t pos);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
                        size_t count, loff_t pos);

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

extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);

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

/*
 * linux/fs/nfs/unlink.c
 */
extern int  nfs_async_unlink(struct dentry *);
extern void nfs_complete_unlink(struct dentry *);

/*
 * linux/fs/nfs/write.c
 */
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);
extern void nfs_writeback_done(struct rpc_task *task);

#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern void nfs_commit_done(struct rpc_task *);
#endif

/*
 * Try to write back everything synchronously (but check the
 * return value!)
 */
extern int  nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int  nfs_commit_inode(struct inode *, unsigned long, unsigned int, int);
#else
static inline int
nfs_commit_inode(struct inode *inode, unsigned long idx_start, unsigned int npages, int how)
{
        return 0;
}
#endif

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

static inline int
nfs_wb_all(struct inode *inode)
{
        int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
        return (error < 0) ? error : 0;
}

/*
 * Write back all requests on one page - we do this before reading it.
 */
static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
{
        int error = nfs_sync_inode(inode, page->index, 1,
                        how | FLUSH_WAIT | FLUSH_STABLE);
        return (error < 0) ? error : 0;
}

static inline int nfs_wb_page(struct inode *inode, struct page* page)
{
        return nfs_wb_page_priority(inode, page, 0);
}

/*
 * Allocate and free nfs_write_data structures
 */
extern mempool_t *nfs_wdata_mempool;

static inline struct nfs_write_data *nfs_writedata_alloc(void)
{
        struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
        if (p) {
                memset(p, 0, sizeof(*p));
                INIT_LIST_HEAD(&p->pages);
        }
        return p;
}

static inline void nfs_writedata_free(struct nfs_write_data *p)
{
        mempool_free(p, nfs_wdata_mempool);
}

/* Hack for future NFS swap support */
#ifndef IS_SWAPFILE
# define IS_SWAPFILE(inode)     (0)
#endif

/*
 * 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 void nfs_readpage_result(struct rpc_task *);

/*
 * Allocate and free nfs_read_data structures
 */
extern mempool_t *nfs_rdata_mempool;

static inline struct nfs_read_data *nfs_readdata_alloc(void)
{
        struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
        if (p)
                memset(p, 0, sizeof(*p));
        return p;
}

static inline void nfs_readdata_free(struct nfs_read_data *p)
{
        mempool_free(p, nfs_rdata_mempool);
}

extern void  nfs_readdata_release(struct rpc_task *task);

/*
 * linux/fs/mount_clnt.c
 * (Used only by nfsroot module)
 */
extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
                int, int);

/*
 * inline functions
 */

static inline loff_t
nfs_size_to_loff_t(__u64 size)
{
        loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
        if (size > maxsz)
                return maxsz;
        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;
}

/* NFS root */

extern void * nfs_root_data(void);

#define nfs_wait_event(clnt, wq, condition)                             \
({                                                                      \
        int __retval = 0;                                               \
        if (clnt->cl_intr) {                                            \
                sigset_t oldmask;                                       \
                rpc_clnt_sigmask(clnt, &oldmask);                       \
                __retval = wait_event_interruptible(wq, condition);     \
                rpc_clnt_sigunmask(clnt, &oldmask);                     \
        } else                                                          \
                wait_event(wq, condition);                              \
        __retval;                                                       \
})

#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)

#ifdef CONFIG_NFS_V4

struct idmap;

/*
 * In a seqid-mutating op, this macro controls which error return
 * values trigger incrementation of the seqid.
 *
 * from rfc 3010:
 * The client MUST monotonically increment the sequence number for the
 * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
 * operations.  This is true even in the event that the previous
 * operation that used the sequence number received an error.  The only
 * exception to this rule is if the previous operation received one of
 * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
 * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
 * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
 *
 */
#define seqid_mutating_err(err)       \
(((err) != NFSERR_STALE_CLIENTID) &&  \
 ((err) != NFSERR_STALE_STATEID)  &&  \
 ((err) != NFSERR_BAD_STATEID)    &&  \
 ((err) != NFSERR_BAD_SEQID)      &&  \
 ((err) != NFSERR_BAD_XDR)        &&  \
 ((err) != NFSERR_RESOURCE)       &&  \
 ((err) != NFSERR_NOFILEHANDLE))

enum nfs4_client_state {
        NFS4CLNT_OK  = 0,
};

/*
 * The nfs4_client identifies our client state to the server.
 */
struct nfs4_client {
        struct list_head        cl_servers;     /* Global list of servers */
        struct in_addr          cl_addr;        /* Server identifier */
        u64                     cl_clientid;    /* constant */
        nfs4_verifier           cl_confirm;
        unsigned long           cl_state;

        u32                     cl_lockowner_id;

        /*
         * The following rwsem ensures exclusive access to the server
         * while we recover the state following a lease expiration.
         */
        struct rw_semaphore     cl_sem;

        struct list_head        cl_delegations;
        struct list_head        cl_state_owners;
        struct list_head        cl_unused;
        int                     cl_nunused;
        spinlock_t              cl_lock;
        atomic_t                cl_count;

        struct rpc_clnt *       cl_rpcclient;
        struct rpc_cred *       cl_cred;

        struct list_head        cl_superblocks; /* List of nfs_server structs */

        unsigned long           cl_lease_time;
        unsigned long           cl_last_renewal;
        struct work_struct      cl_renewd;
        struct work_struct      cl_recoverd;

        wait_queue_head_t       cl_waitq;
        struct rpc_wait_queue   cl_rpcwaitq;

        /* used for the setclientid verifier */
        struct timespec         cl_boot_time;

        /* idmapper */
        struct idmap *          cl_idmap;

        /* Our own IP address, as a null-terminated string.
         * This is used to generate the clientid, and the callback address.
         */
        char                    cl_ipaddr[16];
        unsigned char           cl_id_uniquifier;
};

/*
 * NFS4 state_owners and lock_owners are simply labels for ordered
 * sequences of RPC calls. Their sole purpose is to provide once-only
 * semantics by allowing the server to identify replayed requests.
 *
 * The ->so_sema is held during all state_owner seqid-mutating operations:
 * OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
 * so_seqid.
 */
struct nfs4_state_owner {
        struct list_head     so_list;    /* per-clientid list of state_owners */
        struct nfs4_client   *so_client;
        u32                  so_id;      /* 32-bit identifier, unique */
        struct semaphore     so_sema;
        u32                  so_seqid;   /* protected by so_sema */
        atomic_t             so_count;

        struct rpc_cred      *so_cred;   /* Associated cred */
        struct list_head     so_states;
        struct list_head     so_delegations;
};

/*
 * struct nfs4_state maintains the client-side state for a given
 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 *
 * OPEN:
 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 * we need to know how many files are open for reading or writing on a
 * given inode. This information too is stored here.
 *
 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 */

struct nfs4_lock_state {
        struct list_head        ls_locks;       /* Other lock stateids */
        fl_owner_t              ls_owner;       /* POSIX lock owner */
#define NFS_LOCK_INITIALIZED 1
        int                     ls_flags;
        u32                     ls_seqid;
        u32                     ls_id;
        nfs4_stateid            ls_stateid;
        atomic_t                ls_count;
};

/* bits for nfs4_state->flags */
enum {
        LK_STATE_IN_USE,
        NFS_DELEGATED_STATE,
};

struct nfs4_state {
        struct list_head open_states;   /* List of states for the same state_owner */
        struct list_head inode_states;  /* List of states for the same inode */
        struct list_head lock_states;   /* List of subservient lock stateids */

        struct nfs4_state_owner *owner; /* Pointer to the open owner */
        struct inode *inode;            /* Pointer to the inode */

        unsigned long flags;            /* Do we hold any locks? */
        struct semaphore lock_sema;     /* Serializes file locking operations */
        rwlock_t state_lock;            /* Protects the lock_states list */

        nfs4_stateid stateid;

        unsigned int nreaders;
        unsigned int nwriters;
        int state;                      /* State on the server (R,W, or RW) */
        atomic_t count;
};


struct nfs4_exception {
        long timeout;
        int retry;
};

struct nfs4_state_recovery_ops {
        int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
        int (*recover_lock)(struct nfs4_state *, struct file_lock *);
};

extern struct dentry_operations nfs4_dentry_operations;
extern struct inode_operations nfs4_dir_inode_operations;

/* nfs4proc.c */
extern int nfs4_map_errors(int err);
extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
extern int nfs4_proc_async_renew(struct nfs4_client *);
extern int nfs4_proc_renew(struct nfs4_client *);
extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode);
extern struct inode *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
extern int nfs4_open_revalidate(struct inode *, struct dentry *, int);

extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;

/* nfs4renewd.c */
extern void nfs4_schedule_state_renewal(struct nfs4_client *);
extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
extern void nfs4_kill_renewd(struct nfs4_client *);

/* nfs4state.c */
extern void init_nfsv4_state(struct nfs_server *);
extern void destroy_nfsv4_state(struct nfs_server *);
extern struct nfs4_client *nfs4_get_client(struct in_addr *);
extern void nfs4_put_client(struct nfs4_client *clp);
extern int nfs4_init_client(struct nfs4_client *clp);
extern struct nfs4_client *nfs4_find_client(struct in_addr *);
extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);

extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
extern void nfs4_put_state_owner(struct nfs4_state_owner *);
extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
extern void nfs4_put_open_state(struct nfs4_state *);
extern void nfs4_close_state(struct nfs4_state *, mode_t);
extern struct nfs4_state *nfs4_find_state(struct inode *, struct rpc_cred *, mode_t mode);
extern void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp);
extern void nfs4_schedule_state_recovery(struct nfs4_client *);
extern struct nfs4_lock_state *nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t);
extern struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t);
extern void nfs4_put_lock_state(struct nfs4_lock_state *state);
extern void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *ls);
extern void nfs4_notify_setlk(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
extern void nfs4_notify_unlck(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);



struct nfs4_mount_data;
#else
#define init_nfsv4_state(server)  do { } while (0)
#define destroy_nfsv4_state(server)       do { } while (0)
#define nfs4_put_state_owner(inode, owner) do { } while (0)
#define nfs4_put_open_state(state) do { } while (0)
#define nfs4_close_state(a, b) do { } while (0)
#define nfs4_renewd_prepare_shutdown(server) do { } while (0)
#endif

#endif /* __KERNEL__ */

/*
 * NFS debug flags
 */
#define NFSDBG_VFS              0x0001
#define NFSDBG_DIRCACHE         0x0002
#define NFSDBG_LOOKUPCACHE      0x0004
#define NFSDBG_PAGECACHE        0x0008
#define NFSDBG_PROC             0x0010
#define NFSDBG_XDR              0x0020
#define NFSDBG_FILE             0x0040
#define NFSDBG_ROOT             0x0080
#define NFSDBG_CALLBACK         0x0100
#define NFSDBG_ALL              0xFFFF

#ifdef __KERNEL__
# undef ifdebug
# ifdef NFS_DEBUG
#  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
# else
#  define ifdebug(fac)          if (0)
# endif
#endif /* __KERNEL */

#endif