The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: cnode.h,v 1.17 2008/03/21 17:59:57 plunky Exp $        */
    2 
    3 /*
    4  *
    5  *             Coda: an Experimental Distributed File System
    6  *                              Release 3.1
    7  *
    8  *           Copyright (c) 1987-1998 Carnegie Mellon University
    9  *                          All Rights Reserved
   10  *
   11  * Permission  to  use, copy, modify and distribute this software and its
   12  * documentation is hereby granted,  provided  that  both  the  copyright
   13  * notice  and  this  permission  notice  appear  in  all  copies  of the
   14  * software, derivative works or  modified  versions,  and  any  portions
   15  * thereof, and that both notices appear in supporting documentation, and
   16  * that credit is given to Carnegie Mellon University  in  all  documents
   17  * and publicity pertaining to direct or indirect use of this code or its
   18  * derivatives.
   19  *
   20  * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
   21  * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
   22  * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
   23  * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
   24  * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
   25  * ANY DERIVATIVE WORK.
   26  *
   27  * Carnegie  Mellon  encourages  users  of  this  software  to return any
   28  * improvements or extensions that  they  make,  and  to  grant  Carnegie
   29  * Mellon the rights to redistribute these changes without encumbrance.
   30  *
   31  *      @(#) coda/cnode.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $
   32  */
   33 
   34 /*
   35  * Mach Operating System
   36  * Copyright (c) 1990 Carnegie-Mellon University
   37  * Copyright (c) 1989 Carnegie-Mellon University
   38  * All rights reserved.  The CMU software License Agreement specifies
   39  * the terms and conditions for use and redistribution.
   40  */
   41 
   42 /*
   43  * This code was written for the Coda file system at Carnegie Mellon University.
   44  * Contributers include David Steere, James Kistler, and M. Satyanarayanan.
   45  */
   46 
   47 #ifndef _CNODE_H_
   48 #define _CNODE_H_
   49 
   50 #include <sys/vnode.h>
   51 #ifdef _KERNEL
   52 #include <sys/mallocvar.h>
   53 
   54 MALLOC_DECLARE(M_CODA);
   55 #endif
   56 
   57 /*
   58  * Cnode lookup stuff.
   59  * NOTE: CODA_CACHESIZE must be a power of 2 for cfshash to work!
   60  */
   61 #define CODA_CACHESIZE 512
   62 
   63 #define CODA_ALLOC(ptr, cast, size)                                        \
   64 do {                                                                      \
   65     ptr = (cast)malloc((unsigned long) size, M_CODA, M_WAITOK);            \
   66     if (ptr == 0) {                                                       \
   67         panic("kernel malloc returns 0 at %s:%d\n", __FILE__, __LINE__);  \
   68     }                                                                     \
   69 } while (/*CONSTCOND*/ 0)
   70 
   71 #define CODA_FREE(ptr, size)  free((ptr), M_CODA)
   72 
   73 /*
   74  * global cache state control
   75  */
   76 extern int coda_nc_use;
   77 
   78 /*
   79  * Used to select debugging statements throughout the cfs code.
   80  */
   81 extern int codadebug;
   82 extern int coda_nc_debug;
   83 extern int coda_printf_delay;
   84 extern int coda_vnop_print_entry;
   85 extern int coda_psdev_print_entry;
   86 extern int coda_vfsop_print_entry;
   87 
   88 #define CODADBGMSK(N)            (1 << N)
   89 #define CODADEBUG(N, STMT)       { if (codadebug & CODADBGMSK(N)) { STMT } }
   90 #define myprintf(args)          \
   91 do {                            \
   92     if (coda_printf_delay)       \
   93         DELAY(coda_printf_delay);\
   94     printf args ;               \
   95 } while (/*CONSTCOND*/ 0)
   96 
   97 struct cnode {
   98     struct vnode        *c_vnode;
   99     u_short              c_flags;       /* flags (see below) */
  100     CodaFid              c_fid;         /* file handle */
  101     struct vnode        *c_ovp;         /* open vnode pointer */
  102     u_short              c_ocount;      /* count of openers */
  103     u_short              c_owrite;      /* count of open for write */
  104     struct vattr         c_vattr;       /* attributes */
  105     char                *c_symlink;     /* pointer to symbolic link */
  106     u_short              c_symlen;      /* length of symbolic link */
  107     dev_t                c_device;      /* associated vnode device */
  108     ino_t                c_inode;       /* associated vnode inode */
  109     struct cnode        *c_next;        /* links if on NetBSD machine */
  110 };
  111 #define VTOC(vp)        ((struct cnode *)(vp)->v_data)
  112 #define SET_VTOC(vp)    ((vp)->v_data)
  113 #define CTOV(cp)        ((struct vnode *)((cp)->c_vnode))
  114 
  115 /* flags */
  116 #define C_VATTR         0x01    /* Validity of vattr in the cnode */
  117 #define C_SYMLINK       0x02    /* Validity of symlink pointer in the Code */
  118 #define C_WANTED        0x08    /* Set if lock wanted */
  119 #define C_LOCKED        0x10    /* Set if lock held */
  120 #define C_UNMOUNTING    0X20    /* Set if unmounting */
  121 #define C_PURGING       0x40    /* Set if purging a fid */
  122 
  123 #define VALID_VATTR(cp)         ((cp->c_flags) & C_VATTR)
  124 #define VALID_SYMLINK(cp)       ((cp->c_flags) & C_SYMLINK)
  125 #define IS_UNMOUNTING(cp)       ((cp)->c_flags & C_UNMOUNTING)
  126 
  127 struct vmsg;
  128 
  129 struct vcomm {
  130         u_long                  vc_seq;
  131         int                     vc_open;
  132         struct selinfo          vc_selproc;
  133         TAILQ_HEAD(,vmsg)       vc_requests;
  134         TAILQ_HEAD(,vmsg)       vc_replies;
  135 };
  136 
  137 #define VC_OPEN(vcp)            ((vcp)->vc_open == 1)
  138 #define MARK_VC_CLOSED(vcp)     ((vcp)->vc_open = 0)
  139 #define MARK_VC_OPEN(vcp)       ((vcp)->vc_open = 1)
  140 
  141 struct coda_clstat {
  142         int     ncalls;                 /* client requests */
  143         int     nbadcalls;              /* upcall failures */
  144         int     reqs[CODA_NCALLS];      /* count of each request */
  145 };
  146 extern struct coda_clstat coda_clstat;
  147 
  148 /*
  149  * CODA structure to hold mount/file system information
  150  */
  151 struct coda_mntinfo {
  152     struct vnode        *mi_rootvp;
  153     struct mount        *mi_vfsp;
  154     struct vcomm         mi_vcomm;
  155     int                  mi_started;
  156 };
  157 extern struct coda_mntinfo coda_mnttbl[]; /* indexed by minor device number */
  158 
  159 /*
  160  * vfs pointer to mount info
  161  */
  162 #define vftomi(vfsp)    ((struct coda_mntinfo *)(vfsp->mnt_data))
  163 #define CODA_MOUNTED(vfsp)   ((vftomi(vfsp) != (struct coda_mntinfo *)0) \
  164         && (vftomi(vfsp)->mi_started))
  165 
  166 /*
  167  * vnode pointer to mount info
  168  */
  169 #define vtomi(vp)       ((struct coda_mntinfo *)(vp->v_mount->mnt_data))
  170 
  171 /*
  172  * Used for identifying usage of "Control" object
  173  */
  174 extern struct vnode *coda_ctlvp;
  175 #define IS_CTL_VP(vp)           ((vp) == coda_ctlvp)
  176 #define IS_CTL_NAME(vp, name, l)((l == CODA_CONTROLLEN) \
  177                                  && ((vp) == vtomi((vp))->mi_rootvp)    \
  178                                  && strncmp(name, CODA_CONTROL, l) == 0)
  179 
  180 /*
  181  * An enum to tell us whether something that will remove a reference
  182  * to a cnode was a downcall or not
  183  */
  184 enum dc_status {
  185     IS_DOWNCALL = 6,
  186     NOT_DOWNCALL = 7
  187 };
  188 
  189 /* cfs_psdev.h */
  190 extern int coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize, void *buffer);
  191 extern int coda_kernel_version;
  192 
  193 /* cfs_subr.h */
  194 extern int  handleDownCall(int opcode, union outputArgs *out);
  195 extern void coda_unmounting(struct mount *whoIam);
  196 extern int  coda_vmflush(struct cnode *cp);
  197 
  198 /* cfs_vnodeops.h */
  199 extern struct cnode *make_coda_node(CodaFid *fid, struct mount *vfsp, short type);
  200 extern int coda_vnodeopstats_init(void);
  201 
  202 /* coda_vfsops.h */
  203 extern struct mount *devtomp(dev_t dev);
  204 
  205 /* sigh */
  206 #define CODA_RDWR ((u_long) 31)
  207 
  208 #endif  /* _CNODE_H_ */
  209 

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