FreeBSD/Linux Kernel Cross Reference
sys/fs/coda/cnode.h

     /*-
      * 
      *             Coda: an Experimental Distributed File System
      *                              Release 3.1
      * 
      *           Copyright (c) 1987-1998 Carnegie Mellon University
      *                          All Rights Reserved
      * 
      * Permission  to  use, copy, modify and distribute this software and its
     * documentation is hereby granted,  provided  that  both  the  copyright
     * notice  and  this  permission  notice  appear  in  all  copies  of the
     * software, derivative works or  modified  versions,  and  any  portions
     * thereof, and that both notices appear in supporting documentation, and
     * that credit is given to Carnegie Mellon University  in  all  documents
     * and publicity pertaining to direct or indirect use of this code or its
     * derivatives.
     * 
     * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
     * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
     * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
     * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
     * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
     * ANY DERIVATIVE WORK.
     * 
     * Carnegie  Mellon  encourages  users  of  this  software  to return any
     * improvements or extensions that  they  make,  and  to  grant  Carnegie
     * Mellon the rights to redistribute these changes without encumbrance.
     * 
     *      @(#) src/sys/coda/cnode.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $ 
     * $FreeBSD$
     * 
     */
    
    /*-
     * Mach Operating System
     * Copyright (c) 1990 Carnegie-Mellon University
     * Copyright (c) 1989 Carnegie-Mellon University
     * All rights reserved.  The CMU software License Agreement specifies
     * the terms and conditions for use and redistribution.
     */
    
    /*
     * This code was written for the Coda filesystem at Carnegie Mellon University.
     * Contributers include David Steere, James Kistler, and M. Satyanarayanan.
     */
    
    #ifndef _CNODE_H_
    #define _CNODE_H_
    
    #include <sys/vnode.h>
    #include <sys/lock.h>
    
    MALLOC_DECLARE(M_CODA);
    
    /*
     * tmp below since we need struct queue
     */
    #include <fs/coda/coda_kernel.h>
    
    /*
     * Cnode lookup stuff.
     * NOTE: CODA_CACHESIZE must be a power of 2 for cfshash to work!
     */
    #define CODA_CACHESIZE 512
    
    #define CODA_ALLOC(ptr, cast, size)                                        \
    do {                                                                      \
        ptr = (cast)malloc((unsigned long) size, M_CODA, M_WAITOK);            \
        if (ptr == 0) {                                                       \
            panic("kernel malloc returns 0 at %s:%d\n", __FILE__, __LINE__);  \
        }                                                                     \
    } while (0)
    
    #define CODA_FREE(ptr, size)  free((ptr), M_CODA)
    
    /*
     * Used to select debugging statements throughout the cfs code.
     */
    extern int codadebug;
    extern int coda_printf_delay;
    extern int coda_vnop_print_entry;
    extern int coda_psdev_print_entry;
    extern int coda_vfsop_print_entry;
    
    #define CODADBGMSK(N)            (1 << N)
    #define CODADEBUG(N, STMT)       { if (codadebug & CODADBGMSK(N)) { STMT } }
    #define myprintf(args)          \
    do {                            \
        if (coda_printf_delay)       \
            DELAY(coda_printf_delay);\
        printf args ;               \
    } while (0)
    
    struct cnode {
        struct vnode        *c_vnode;
        u_short              c_flags;       /* flags (see below) */
        CodaFid              c_fid;         /* file handle */
        struct vnode        *c_ovp;         /* open vnode pointer */
        u_short              c_ocount;      /* count of openers */
       u_short              c_owrite;      /* count of open for write */
       struct vattr         c_vattr;       /* attributes */
       char                *c_symlink;     /* pointer to symbolic link */
       u_short              c_symlen;      /* length of symbolic link */
       struct cnode        *c_next;        /* links if on NetBSD machine */
   };
   #define VTOC(vp)        ((struct cnode *)(vp)->v_data)
   #define CTOV(cp)        ((struct vnode *)((cp)->c_vnode))
   
   /* flags */
   #define C_VATTR         0x01    /* Validity of vattr in the cnode */
   #define C_SYMLINK       0x02    /* Validity of symlink pointer in the Code */
   #define C_WANTED        0x08    /* Set if lock wanted */
   #define C_LOCKED        0x10    /* Set if lock held */
   #define C_UNMOUNTING    0X20    /* Set if unmounting */
   #define C_PURGING       0x40    /* Set if purging a fid */
   
   #define VALID_VATTR(cp)         ((cp->c_flags) & C_VATTR)
   #define VALID_SYMLINK(cp)       ((cp->c_flags) & C_SYMLINK)
   #define IS_UNMOUNTING(cp)       ((cp)->c_flags & C_UNMOUNTING)
   
   struct vcomm {
           u_long          vc_seq;
           struct selinfo  vc_selproc;
           struct queue    vc_requests;
           struct queue    vc_replys;
   };
   
   #define VC_OPEN(vcp)        ((vcp)->vc_requests.forw != NULL)
   #define MARK_VC_CLOSED(vcp) (vcp)->vc_requests.forw = NULL;
   #define MARK_VC_OPEN(vcp)    /* MT */
   
   struct coda_clstat {
           int     ncalls;                 /* client requests */
           int     nbadcalls;              /* upcall failures */
           int     reqs[CODA_NCALLS];      /* count of each request */
   };
   extern struct coda_clstat coda_clstat;
   
   /*
    * CODA structure to hold mount/filesystem information
    */
   struct coda_mntinfo {
       struct vnode        *mi_rootvp;
       struct mount        *mi_vfsp;
       struct vcomm         mi_vcomm;
       struct cdev         *dev;
       int                  mi_started;
       LIST_ENTRY(coda_mntinfo) mi_list;
   };
   struct coda_mntinfo *dev2coda_mntinfo(struct cdev *dev);
   
   /*
    * vfs pointer to mount info
    */
   #define vftomi(vfsp)    ((struct coda_mntinfo *)(vfsp->mnt_data))
   #define CODA_MOUNTED(vfsp)   (vftomi((vfsp)) != (struct coda_mntinfo *)0)
   
   /*
    * vnode pointer to mount info
    */
   #define vtomi(vp)       ((struct coda_mntinfo *)(vp->v_mount->mnt_data))
   
   /*
    * Used for identifying usage of "Control" object
    */
   extern struct vnode *coda_ctlvp;
   #define IS_CTL_VP(vp)           ((vp) == coda_ctlvp)
   #define IS_CTL_NAME(vp, name, l)((l == CODA_CONTROLLEN) \
                                    && ((vp) == vtomi((vp))->mi_rootvp)    \
                                    && strncmp(name, CODA_CONTROL, l) == 0)
   
   /* 
    * An enum to tell us whether something that will remove a reference
    * to a cnode was a downcall or not
    */
   enum dc_status {
       IS_DOWNCALL = 6,
       NOT_DOWNCALL = 7
   };
   
   /* cfs_psdev.h */
   int coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize, caddr_t buffer);
   extern int coda_kernel_version;
   
   /* cfs_subr.h */
   int  handleDownCall(int opcode, union outputArgs *out);
   void coda_unmounting(struct mount *whoIam);
   int  coda_vmflush(struct cnode *cp);
   
   /* cfs_vnodeops.h */
   struct cnode *make_coda_node(CodaFid *fid, struct mount *vfsp, short type);
   int coda_vnodeopstats_init(void);
   
   /* coda_vfsops.h */
   struct mount *devtomp(struct cdev *dev);
   
   /* sigh */
   #define CODA_RDWR ((u_long) 31)
   
   #endif  /* _CNODE_H_ */
   

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