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/*

 *  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/magic.h>

/* Default timeout values */

#define NFS_MAX_UDP_TIMEOUT     (60*HZ)

#define NFS_MAX_TCP_TIMEOUT     (600*HZ)

/*

 * When flushing a cluster of dirty pages, there can be different

 * strategies:

 */

#define FLUSH_SYNC              1       /* file being synced, or contention */

#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 */

#define FLUSH_NOCOMMIT          32      /* Don't send the NFSv3/v4 COMMIT */

#define FLUSH_INVALIDATE        64      /* Invalidate the page cache */

#define FLUSH_NOWRITEPAGE       128     /* Don't call writepage() */

#ifdef __KERNEL__

#include <linux/in.h>

#include <linux/kref.h>

#include <linux/mm.h>

#include <linux/namei.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 nfs4_state;

struct nfs_open_context {

        atomic_t count;

        struct path path;

        struct rpc_cred *cred;

        struct nfs4_state *state;

        fl_owner_t lockowner;

        int mode;

        unsigned long flags;

#define NFS_CONTEXT_ERROR_WRITE         (0)

        int error;

        struct list_head list;

        __u64 dir_cookie;

};

/*

 * 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

         */

        unsigned long           read_cache_jiffies;

        unsigned long           attrtimeo;

        unsigned long           attrtimeo_timestamp;

        __u64                   change_attr;            /* v4 only */

        unsigned long           last_updated;

        /* "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;

#ifdef CONFIG_NFS_V3_ACL

        struct posix_acl        *acl_access;

        struct posix_acl        *acl_default;

#endif

        /*

         * This is the cookie verifier used for NFSv3 readdir

         * operations

         */

        __be32                  cookieverf[2];

        /*

         * This is the list of dirty unwritten pages.

         */

        struct radix_tree_root  nfs_page_tree;

        unsigned long           ncommit,

                                npages;

        /* 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;

#ifdef CONFIG_NFS_V4

        struct nfs4_cached_acl  *nfs4_acl;

        /* 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;

};

/*

 * 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 */

/*

 * Bit offsets in flags field

 */

#define NFS_INO_REVALIDATING    (0)             /* revalidating attrs */

#define NFS_INO_ADVISE_RDPLUS   (1)             /* advise readdirplus */

#define NFS_INO_STALE           (2)             /* possible stale inode */

#define NFS_INO_ACL_LRU_SET     (3)             /* Inode is on the LRU list */

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)->nfs_client->rpc_ops)

#define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)

#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_FLAGS(inode)                (NFS_I(inode)->flags)

#define NFS_STALE(inode)                (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))

#define NFS_FILEID(inode)               (NFS_I(inode)->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_INVALID_ACCESS;

        if (S_ISDIR(inode->i_mode))

                nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|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 int NFS_USE_READDIRPLUS(struct inode *inode)

{

        return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));

}

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 *);

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_getattr(struct vfsmount *, struct dentry *, struct kstat *);

extern int nfs_permission(struct inode *, int, struct nameidata *);

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_revalidate_mapping(struct inode *inode, struct address_space *mapping);

extern int nfs_revalidate_mapping_nolock(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);

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, int mode);

extern u64 nfs_compat_user_ino64(u64 fileid);

/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */

extern __be32 root_nfs_parse_addr(char *name); /*__init*/

static inline void nfs_fattr_init(struct nfs_fattr *fattr)

{

        fattr->valid = 0;

        fattr->time_start = jiffies;

}

/*

 * linux/fs/nfs/file.c

 */

extern const struct inode_operations nfs_file_inode_operations;

#ifdef CONFIG_NFS_V3

extern const struct inode_operations nfs3_file_inode_operations;

#endif /* CONFIG_NFS_V3 */

extern const struct file_operations nfs_file_operations;

extern const struct address_space_operations nfs_file_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)

                return nfs_file_open_context(file)->cred;

        return NULL;

}

/*

 * linux/fs/nfs/xattr.c

 */

#ifdef CONFIG_NFS_V3_ACL

extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);

extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);

extern int nfs3_setxattr(struct dentry *, const char *,

                        const void *, size_t, int);

extern int nfs3_removexattr (struct dentry *, const char *name);

#else

# define nfs3_listxattr NULL

# define nfs3_getxattr NULL

# define nfs3_setxattr NULL

# define nfs3_removexattr NULL

#endif

/*

 * 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,

                        const struct iovec *iov, unsigned long nr_segs,

                        loff_t pos);

extern ssize_t nfs_file_direct_write(struct kiocb *iocb,

                        const struct iovec *iov, unsigned long nr_segs,

                        loff_t pos);

/*

 * linux/fs/nfs/dir.c

 */

extern const struct inode_operations nfs_dir_inode_operations;

#ifdef CONFIG_NFS_V3

extern const struct inode_operations nfs3_dir_inode_operations;

#endif /* CONFIG_NFS_V3 */

extern const 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);

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 struct list_head nfs_automount_list;

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 int  nfs_async_unlink(struct inode *dir, struct dentry *dentry);

extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);

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);

extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);

extern void nfs_writedata_release(void *);

/*

 * Try to write back everything synchronously (but check the

 * return value!)

 */

extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);

extern int nfs_wb_all(struct inode *inode);

extern int nfs_wb_nocommit(struct inode *inode);

extern int nfs_wb_page(struct inode *inode, struct page* page);

extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);

#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)

extern int  nfs_commit_inode(struct inode *, int);

extern struct nfs_write_data *nfs_commit_alloc(void);

extern void nfs_commit_free(struct nfs_write_data *wdata);

extern void nfs_commit_release(void *wdata);

#else

static inline int

nfs_commit_inode(struct inode *inode, int how)

{

        return 0;

}

#endif

static inline int

nfs_have_writebacks(struct inode *inode)

{

        return NFS_I(inode)->npages != 0;

}

/*

 * Allocate nfs_write_data structures

 */

extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);

/*

 * 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_result(struct rpc_task *, struct nfs_read_data *);

extern void nfs_readdata_release(void *data);

/*

 * Allocate nfs_read_data structures

 */

extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);

/*

 * linux/fs/nfs3proc.c

 */

#ifdef CONFIG_NFS_V3_ACL

extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);

extern int nfs3_proc_setacl(struct inode *inode, int type,

                            struct posix_acl *acl);

extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,

                mode_t mode);

extern void nfs3_forget_cached_acls(struct inode *inode);

#else

static inline int nfs3_proc_set_default_acl(struct inode *dir,

                                            struct inode *inode,

                                            mode_t mode)

{

        return 0;

}

static inline void nfs3_forget_cached_acls(struct inode *inode)

{

}

#endif /* CONFIG_NFS_V3_ACL */

/*

 * linux/fs/mount_clnt.c

 */

extern int  nfs_mount(struct sockaddr *, size_t, char *, char *,

                      int, int, struct nfs_fh *);

/*

 * 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;

}

/* 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)

#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_CLIENT           0x0200

#define NFSDBG_MOUNT            0x0400

#define NFSDBG_ALL              0xFFFF

#ifdef __KERNEL__

/*

 * Enable debugging support for nfs client.

 * Requires RPC_DEBUG.

 */

#ifdef RPC_DEBUG

# define NFS_DEBUG

#endif

# undef ifdebug

# ifdef NFS_DEBUG

#  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))

# else

#  define ifdebug(fac)          if (0)

# endif

#endif /* __KERNEL */

#endif