usr/src/sys/nfs/nfs.h

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)nfs.h       7.11 (Berkeley) %G%
 */

/*
 * Tunable constants for nfs
 */

#define NFS_MAXIOVEC    34
#define NFS_HZ          10              /* Ticks per second for NFS timeouts */
#define NFS_TIMEO       (1*NFS_HZ)      /* Default timeout = 1 second */
#define NFS_MINTIMEO    (NFS_HZ)        /* Min timeout to use */
#define NFS_MAXTIMEO    (60*NFS_HZ)     /* Max timeout to backoff to */
#define NFS_MINIDEMTIMEO (2*NFS_HZ)     /* Min timeout for non-idempotent ops*/
#define NFS_RELIABLETIMEO (5*NFS_HZ)    /* Min timeout on reliable sockets */
#define NFS_MAXREXMIT   100             /* Stop counting after this many */
#define NFS_MAXWINDOW   1024            /* Max number of outstanding requests */
#define NFS_RETRANS     10              /* Num of retrans for soft mounts */
#define NFS_FISHY       8               /* Host not responding at this count */
#define NFS_ATTRTIMEO   5               /* Attribute cache timeout in sec */
#define NFS_WSIZE       8192            /* Def. write data size <= 8192 */
#define NFS_RSIZE       8192            /* Def. read data size <= 8192 */
#define NFS_MAXREADDIR  NFS_MAXDATA     /* Max. size of directory read */
#define NFS_MAXASYNCDAEMON 20           /* Max. number async_daemons runable */
#define NFS_DIRBLKSIZ   1024            /* Size of an NFS directory block */
#define NMOD(a)         ((a) % nfs_asyncdaemons)

/*
 * The set of signals the interrupt an I/O in progress for NFSMNT_INT mounts.
 * What should be in this set is open to debate, but I believe that since
 * I/O system calls on ufs are never interrupted by signals the set should
 * be minimal. My reasoning is that many current programs that use signals
 * such as SIGALRM will not expect file I/O system calls to be interrupted
 * by them and break.
 */
#define NFSINT_SIGMASK  (sigmask(SIGINT)|sigmask(SIGTERM)|sigmask(SIGKILL)| \
                         sigmask(SIGHUP)|sigmask(SIGQUIT))

/*
 * Socket errors ignored for connectionless sockets??
 * For now, ignore them all
 */
#define NFSIGNORE_SOERROR(s, e) \
                ((e) != EINTR && (e) != ERESTART && (e) != EWOULDBLOCK && \
                ((s) & PR_CONNREQUIRED) == 0)

/*
 * Nfs outstanding request list element
 */
struct nfsreq {
        struct nfsreq   *r_next;
        struct nfsreq   *r_prev;
        struct mbuf     *r_mreq;
        struct mbuf     *r_mrep;
        struct nfsmount *r_nmp;
        struct vnode    *r_vp;
        u_long          r_xid;
        short           r_flags;        /* flags on request, see below */
        short           r_retry;        /* max retransmission count */
        short           r_rexmit;       /* current retrans count */
        short           r_timer;        /* tick counter on reply */
        short           r_timerinit;    /* reinit tick counter on reply */
        struct proc     *r_procp;       /* Proc that did I/O system call */
};

/* Flag values for r_flags */
#define R_TIMING        0x01            /* timing request (in mntp) */
#define R_SENT          0x02            /* request has been sent */
#define R_SOFTTERM      0x04            /* soft mnt, too many retries */
#define R_INTR          0x08            /* intr mnt, signal pending */
#define R_SOCKERR       0x10            /* Fatal error on socket */
#define R_TPRINTFMSG    0x20            /* Did a tprintf msg. */
#define R_MUSTRESEND    0x40            /* Must resend request */

#ifdef  KERNEL
/*
 * Silly rename structure that hangs off the nfsnode until the name
 * can be removed by nfs_inactive()
 */
struct sillyrename {
        nfsv2fh_t s_fh;
        struct  ucred *s_cred;
        struct  vnode *s_dvp;
        u_short s_namlen;
        char    s_name[20];
};

/* And its flag values */
#define REMOVE          0
#define RMDIR           1
#endif  /* KERNEL */

/*
 * Stats structure
 */
struct nfsstats {
        int     attrcache_hits;
        int     attrcache_misses;
        int     lookupcache_hits;
        int     lookupcache_misses;
        int     direofcache_hits;
        int     direofcache_misses;
        int     biocache_reads;
        int     read_bios;
        int     read_physios;
        int     biocache_writes;
        int     write_bios;
        int     write_physios;
        int     biocache_readlinks;
        int     readlink_bios;
        int     biocache_readdirs;
        int     readdir_bios;
        int     rpccnt[NFS_NPROCS];
        int     rpcretries;
        int     srvrpccnt[NFS_NPROCS];
        int     srvrpc_errs;
        int     srv_errs;
        int     rpcrequests;
        int     rpctimeouts;
        int     rpcunexpected;
        int     rpcinvalid;
        int     srvcache_inproghits;
        int     srvcache_idemdonehits;
        int     srvcache_nonidemdonehits;
        int     srvcache_misses;
};

#ifdef KERNEL
struct nfsstats nfsstats;
#endif /* KERNEL */