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/*
 * linux/include/linux/nfsd/nfsd.h
 *
 * Hodge-podge collection of knfsd-related stuff.
 * I will sort this out later.
 *
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */


#ifndef LINUX_NFSD_NFSD_H
#define LINUX_NFSD_NFSD_H

#include <linux/config.h>
#include <linux/types.h>
#include <linux/unistd.h>
#include <linux/dirent.h>
#include <linux/fs.h>
#include <linux/mount.h>

#include <linux/nfsd/debug.h>
#include <linux/nfsd/nfsfh.h>
#include <linux/nfsd/export.h>
#include <linux/nfsd/auth.h>
#include <linux/nfsd/stats.h>
#include <linux/nfsd/interface.h>
/*
 * nfsd version
 */

#define NFSD_VERSION            "0.5"
#define NFSD_SUPPORTED_MINOR_VERSION    0

#ifdef __KERNEL__
/*
 * Special flags for nfsd_permission. These must be different from MAY_READ,
 * MAY_WRITE, and MAY_EXEC.
 */

#define MAY_NOP                 0
#define MAY_SATTR               8
#define MAY_TRUNC               16
#define MAY_LOCK                32
#define MAY_OWNER_OVERRIDE      64
#define MAY_LOCAL_ACCESS        128 /* IRIX doing local access check on device special file*/
#if (MAY_SATTR | MAY_TRUNC | MAY_LOCK | MAY_OWNER_OVERRIDE | MAY_LOCAL_ACCESS) & (MAY_READ | MAY_WRITE | MAY_EXEC)
# error "please use a different value for MAY_SATTR or MAY_TRUNC or MAY_LOCK or MAY_LOCAL_ACCESS or MAY_OWNER_OVERRIDE."
#endif
#define MAY_CREATE              (MAY_EXEC|MAY_WRITE)
#define MAY_REMOVE              (MAY_EXEC|MAY_WRITE|MAY_TRUNC)

/*
 * Callback function for readdir
 */

struct readdir_cd {
        int                     err;    /* 0, nfserr, or nfserr_eof */
};
typedef int             (*encode_dent_fn)(struct readdir_cd *, const char *,
                                                int, loff_t, ino_t, unsigned int);
typedef int (*nfsd_dirop_t)(struct inode *, struct dentry *, int, int);

extern struct svc_program       nfsd_program;
extern struct svc_version       nfsd_version2, nfsd_version3,
                                nfsd_version4;

/*
 * Function prototypes.
 */

int             nfsd_svc(unsigned short port, int nrservs);
int             nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp);

/* nfsd/vfs.c */
int             fh_lock_parent(struct svc_fh *, struct dentry *);
int             nfsd_racache_init(int);
void            nfsd_racache_shutdown(void);
int             nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
                                struct svc_export **expp);
int             nfsd_lookup(struct svc_rqst *, struct svc_fh *,
                                const char *, int, struct svc_fh *);
int             nfsd_setattr(struct svc_rqst *, struct svc_fh *,
                                struct iattr *, int, time_t);
int             nfsd_create(struct svc_rqst *, struct svc_fh *,
                                char *name, int len, struct iattr *attrs,
                                int type, dev_t rdev, struct svc_fh *res);
#ifdef CONFIG_NFSD_V3
int             nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
int             nfsd_create_v3(struct svc_rqst *, struct svc_fh *,
                                char *name, int len, struct iattr *attrs,
                                struct svc_fh *res, int createmode,
                                u32 *verifier, int *truncp);
int             nfsd_commit(struct svc_rqst *, struct svc_fh *,
                                off_t, unsigned long);
#endif /* CONFIG_NFSD_V3 */
int             nfsd_open(struct svc_rqst *, struct svc_fh *, int,
                                int, struct file *);
void            nfsd_close(struct file *);
int             nfsd_read(struct svc_rqst *, struct svc_fh *,
                                loff_t, struct iovec *,int, unsigned long *);
int             nfsd_write(struct svc_rqst *, struct svc_fh *,
                                loff_t, struct iovec *,int, unsigned long, int *);
int             nfsd_readlink(struct svc_rqst *, struct svc_fh *,
                                char *, int *);
int             nfsd_symlink(struct svc_rqst *, struct svc_fh *,
                                char *name, int len, char *path, int plen,
                                struct svc_fh *res, struct iattr *);
int             nfsd_link(struct svc_rqst *, struct svc_fh *,
                                char *, int, struct svc_fh *);
int             nfsd_rename(struct svc_rqst *,
                                struct svc_fh *, char *, int,
                                struct svc_fh *, char *, int);
int             nfsd_remove(struct svc_rqst *,
                                struct svc_fh *, char *, int);
int             nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
                                char *name, int len);
int             nfsd_truncate(struct svc_rqst *, struct svc_fh *,
                                unsigned long size);
int             nfsd_readdir(struct svc_rqst *, struct svc_fh *,
                             loff_t *, struct readdir_cd *, encode_dent_fn);
int             nfsd_statfs(struct svc_rqst *, struct svc_fh *,
                                struct kstatfs *);

int             nfsd_notify_change(struct inode *, struct iattr *);
int             nfsd_permission(struct svc_export *, struct dentry *, int);


/*
 * NFSv4 State
 */

#ifdef CONFIG_NFSD_V4
void nfs4_state_init(void);
void nfs4_state_shutdown(void);
#else
void static inline nfs4_state_init(void){}
void static inline nfs4_state_shutdown(void){}
#endif

/*
 * lockd binding
 */

void            nfsd_lockd_init(void);
void            nfsd_lockd_shutdown(void);


/*
 * These macros provide pre-xdr'ed values for faster operation.
 */

#define nfs_ok                  __constant_htonl(NFS_OK)
#define nfserr_perm             __constant_htonl(NFSERR_PERM)
#define nfserr_noent            __constant_htonl(NFSERR_NOENT)
#define nfserr_io               __constant_htonl(NFSERR_IO)
#define nfserr_nxio             __constant_htonl(NFSERR_NXIO)
#define nfserr_eagain           __constant_htonl(NFSERR_EAGAIN)
#define nfserr_acces            __constant_htonl(NFSERR_ACCES)
#define nfserr_exist            __constant_htonl(NFSERR_EXIST)
#define nfserr_xdev             __constant_htonl(NFSERR_XDEV)
#define nfserr_nodev            __constant_htonl(NFSERR_NODEV)
#define nfserr_notdir           __constant_htonl(NFSERR_NOTDIR)
#define nfserr_isdir            __constant_htonl(NFSERR_ISDIR)
#define nfserr_inval            __constant_htonl(NFSERR_INVAL)
#define nfserr_fbig             __constant_htonl(NFSERR_FBIG)
#define nfserr_nospc            __constant_htonl(NFSERR_NOSPC)
#define nfserr_rofs             __constant_htonl(NFSERR_ROFS)
#define nfserr_mlink            __constant_htonl(NFSERR_MLINK)
#define nfserr_opnotsupp        __constant_htonl(NFSERR_OPNOTSUPP)
#define nfserr_nametoolong      __constant_htonl(NFSERR_NAMETOOLONG)
#define nfserr_notempty         __constant_htonl(NFSERR_NOTEMPTY)
#define nfserr_dquot            __constant_htonl(NFSERR_DQUOT)
#define nfserr_stale            __constant_htonl(NFSERR_STALE)
#define nfserr_remote           __constant_htonl(NFSERR_REMOTE)
#define nfserr_wflush           __constant_htonl(NFSERR_WFLUSH)
#define nfserr_badhandle        __constant_htonl(NFSERR_BADHANDLE)
#define nfserr_notsync          __constant_htonl(NFSERR_NOT_SYNC)
#define nfserr_badcookie        __constant_htonl(NFSERR_BAD_COOKIE)
#define nfserr_notsupp          __constant_htonl(NFSERR_NOTSUPP)
#define nfserr_toosmall         __constant_htonl(NFSERR_TOOSMALL)
#define nfserr_serverfault      __constant_htonl(NFSERR_SERVERFAULT)
#define nfserr_badtype          __constant_htonl(NFSERR_BADTYPE)
#define nfserr_jukebox          __constant_htonl(NFSERR_JUKEBOX)
#define nfserr_denied           __constant_htonl(NFSERR_DENIED)
#define nfserr_deadlock         __constant_htonl(NFSERR_DEADLOCK)
#define nfserr_expired          __constant_htonl(NFSERR_EXPIRED)
#define nfserr_bad_cookie       __constant_htonl(NFSERR_BAD_COOKIE)
#define nfserr_same             __constant_htonl(NFSERR_SAME)
#define nfserr_clid_inuse       __constant_htonl(NFSERR_CLID_INUSE)
#define nfserr_stale_clientid   __constant_htonl(NFSERR_STALE_CLIENTID)
#define nfserr_resource         __constant_htonl(NFSERR_RESOURCE)
#define nfserr_nofilehandle     __constant_htonl(NFSERR_NOFILEHANDLE)
#define nfserr_minor_vers_mismatch      __constant_htonl(NFSERR_MINOR_VERS_MISMATCH)
#define nfserr_share_denied     __constant_htonl(NFSERR_SHARE_DENIED)
#define nfserr_stale_stateid    __constant_htonl(NFSERR_STALE_STATEID)
#define nfserr_old_stateid      __constant_htonl(NFSERR_OLD_STATEID)
#define nfserr_bad_stateid      __constant_htonl(NFSERR_BAD_STATEID)
#define nfserr_bad_seqid        __constant_htonl(NFSERR_BAD_SEQID)
#define nfserr_symlink          __constant_htonl(NFSERR_SYMLINK)
#define nfserr_not_same         __constant_htonl(NFSERR_NOT_SAME)
#define nfserr_readdir_nospc    __constant_htonl(NFSERR_READDIR_NOSPC)
#define nfserr_bad_xdr          __constant_htonl(NFSERR_BAD_XDR)
#define nfserr_openmode         __constant_htonl(NFSERR_OPENMODE)

/* error codes for internal use */
/* if a request fails due to kmalloc failure, it gets dropped.
 *  Client should resend eventually
 */

#define nfserr_dropit           __constant_htonl(30000)
/* end-of-file indicator in readdir */
#define nfserr_eof              __constant_htonl(30001)

/* Check for dir entries '.' and '..' */
#define isdotent(n, l)  (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))

/*
 * Time of server startup
 */

extern struct timeval   nfssvc_boot;

static inline int is_fsid(struct svc_fh *fh, struct knfsd_fh *reffh)
{
        if (fh->fh_export->ex_flags & NFSEXP_FSID) {
                struct vfsmount *mnt = fh->fh_export->ex_mnt;
                if (!old_valid_dev(mnt->mnt_sb->s_dev) ||
                    (reffh->fh_version == 1 && reffh->fh_fsid_type == 1))
                        return 1;
        }
        return 0;
}


#ifdef CONFIG_NFSD_V4

/* before processing a COMPOUND operation, we have to check that there
 * is enough space in the buffer for XDR encode to succeed.  otherwise,
 * we might process an operation with side effects, and be unable to
 * tell the client that the operation succeeded.
 *
 * COMPOUND_SLACK_SPACE - this is the minimum amount of buffer space
 * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
 * READ, READDIR, and READLINK have their own buffer checks.)  if we
 * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
 *
 * COMPOUND_ERR_SLACK_SPACE - this is the minimum amount of buffer space
 * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
 * care is taken to ensure that we never fall below this level for any
 * reason.
 */

#define COMPOUND_SLACK_SPACE            140    /* OP_GETFH */
#define COMPOUND_ERR_SLACK_SPACE        12     /* OP_SETATTR */

#define NFSD_LEASE_TIME                 60  /* seconds */
#define NFSD_LAUNDROMAT_MINTIMEOUT      10   /* seconds */

/*
 * The following attributes are currently not supported by the NFSv4 server:
 *    ACL           (will be supported in a forthcoming patch)
 *    ARCHIVE       (deprecated anyway)
 *    FS_LOCATIONS  (will be supported eventually)
 *    HIDDEN        (unlikely to be supported any time soon)
 *    MIMETYPE      (unlikely to be supported any time soon)
 *    QUOTA_*       (will be supported in a forthcoming patch)
 *    SYSTEM        (unlikely to be supported any time soon)
 *    TIME_BACKUP   (unlikely to be supported any time soon)
 *    TIME_CREATE   (unlikely to be supported any time soon)
 */

#define NFSD_SUPPORTED_ATTRS_WORD0                                                          \
(FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
 | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
 | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
 | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
 | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
 | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
 | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
 | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_HOMOGENEOUS      \
 | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
 | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE)


#define NFSD_SUPPORTED_ATTRS_WORD1                                                          \
(FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
 | FATTR4_WORD1_OWNER           | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
 | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
 | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
 | FATTR4_WORD1_TIME_CREATE     | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
 | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET)


/* These will return ERR_INVAL if specified in GETATTR or READDIR. */
#define NFSD_WRITEONLY_ATTRS_WORD1                                                          \
(FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)


/* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
#define NFSD_WRITEABLE_ATTRS_WORD0                            FATTR4_WORD0_SIZE
#define NFSD_WRITEABLE_ATTRS_WORD1                                                          \
(FATTR4_WORD1_MODE              | FATTR4_WORD1_OWNER         | FATTR4_WORD1_OWNER_GROUP     \
 | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_METADATA | FATTR4_WORD1_TIME_MODIFY_SET)


#endif /* CONFIG_NFSD_V4 */

#endif /* __KERNEL__ */

#endif /* LINUX_NFSD_NFSD_H */