208 lines
6.4 KiB
C
208 lines
6.4 KiB
C
/* $NetBSD: cnode.h,v 1.20 2014/12/13 15:59:30 hannken Exp $ */
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/*
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*
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* Coda: an Experimental Distributed File System
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* Release 3.1
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*
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* Copyright (c) 1987-1998 Carnegie Mellon University
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* All Rights Reserved
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation, and
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* that credit is given to Carnegie Mellon University in all documents
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* and publicity pertaining to direct or indirect use of this code or its
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* derivatives.
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*
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* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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* ANY DERIVATIVE WORK.
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*
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* Carnegie Mellon encourages users of this software to return any
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* improvements or extensions that they make, and to grant Carnegie
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* Mellon the rights to redistribute these changes without encumbrance.
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*
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* @(#) coda/cnode.h,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1990 Carnegie-Mellon University
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* Copyright (c) 1989 Carnegie-Mellon University
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* All rights reserved. The CMU software License Agreement specifies
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* the terms and conditions for use and redistribution.
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*/
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/*
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* This code was written for the Coda file system at Carnegie Mellon University.
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* Contributers include David Steere, James Kistler, and M. Satyanarayanan.
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*/
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#ifndef _CNODE_H_
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#define _CNODE_H_
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#include <sys/vnode.h>
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#ifdef _KERNEL
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#include <sys/mallocvar.h>
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MALLOC_DECLARE(M_CODA);
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#endif
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/*
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* Cnode lookup stuff.
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* NOTE: CODA_CACHESIZE must be a power of 2 for cfshash to work!
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*/
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#define CODA_CACHESIZE 512
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#define CODA_ALLOC(ptr, cast, size) \
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do { \
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ptr = (cast)malloc((unsigned long) size, M_CODA, M_WAITOK); \
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if (ptr == 0) { \
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panic("kernel malloc returns 0 at %s:%d\n", __FILE__, __LINE__); \
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} \
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} while (/*CONSTCOND*/ 0)
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#define CODA_FREE(ptr, size) free((ptr), M_CODA)
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/*
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* global cache state control
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*/
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extern int coda_nc_use;
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/*
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* Used to select debugging statements throughout the cfs code.
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*/
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extern int codadebug;
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extern int coda_nc_debug;
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extern int coda_printf_delay;
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extern int coda_vnop_print_entry;
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extern int coda_psdev_print_entry;
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extern int coda_vfsop_print_entry;
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#define CODADBGMSK(N) (1 << N)
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#define CODADEBUG(N, STMT) { if (codadebug & CODADBGMSK(N)) { STMT } }
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#define myprintf(args) \
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do { \
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if (coda_printf_delay) \
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DELAY(coda_printf_delay);\
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printf args ; \
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} while (/*CONSTCOND*/ 0)
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struct cnode {
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struct vnode *c_vnode;
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u_short c_flags; /* flags (see below) */
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CodaFid c_fid; /* file handle */
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struct vnode *c_ovp; /* open vnode pointer */
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u_short c_ocount; /* count of openers */
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u_short c_owrite; /* count of open for write */
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struct vattr c_vattr; /* attributes */
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char *c_symlink; /* pointer to symbolic link */
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u_short c_symlen; /* length of symbolic link */
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dev_t c_device; /* associated vnode device */
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ino_t c_inode; /* associated vnode inode */
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kmutex_t c_lock;
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};
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#define VTOC(vp) ((struct cnode *)(vp)->v_data)
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#define SET_VTOC(vp) ((vp)->v_data)
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#define CTOV(cp) ((struct vnode *)((cp)->c_vnode))
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/* flags */
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#define C_VATTR 0x01 /* Validity of vattr in the cnode */
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#define C_SYMLINK 0x02 /* Validity of symlink pointer in the Code */
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#define C_UNMOUNTING 0X20 /* Set if unmounting */
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#define C_PURGING 0x40 /* Set if purging a fid */
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#define VALID_VATTR(cp) ((cp->c_flags) & C_VATTR)
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#define VALID_SYMLINK(cp) ((cp->c_flags) & C_SYMLINK)
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#define IS_UNMOUNTING(cp) ((cp)->c_flags & C_UNMOUNTING)
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struct vmsg;
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struct vcomm {
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u_long vc_seq;
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int vc_open;
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struct selinfo vc_selproc;
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TAILQ_HEAD(,vmsg) vc_requests;
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TAILQ_HEAD(,vmsg) vc_replies;
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};
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#define VC_OPEN(vcp) ((vcp)->vc_open == 1)
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#define MARK_VC_CLOSED(vcp) ((vcp)->vc_open = 0)
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#define MARK_VC_OPEN(vcp) ((vcp)->vc_open = 1)
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struct coda_clstat {
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int ncalls; /* client requests */
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int nbadcalls; /* upcall failures */
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int reqs[CODA_NCALLS]; /* count of each request */
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};
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extern struct coda_clstat coda_clstat;
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/*
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* CODA structure to hold mount/file system information
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*/
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struct coda_mntinfo {
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struct vnode *mi_rootvp;
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struct mount *mi_vfsp;
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struct vcomm mi_vcomm;
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int mi_started;
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};
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extern struct coda_mntinfo coda_mnttbl[]; /* indexed by minor device number */
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/*
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* vfs pointer to mount info
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*/
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#define vftomi(vfsp) ((struct coda_mntinfo *)(vfsp->mnt_data))
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#define CODA_MOUNTED(vfsp) ((vftomi(vfsp) != (struct coda_mntinfo *)0) \
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&& (vftomi(vfsp)->mi_started))
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/*
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* vnode pointer to mount info
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*/
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#define vtomi(vp) ((struct coda_mntinfo *)(vp->v_mount->mnt_data))
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/*
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* Used for identifying usage of "Control" object
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*/
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extern struct vnode *coda_ctlvp;
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#define IS_CTL_VP(vp) ((vp) == coda_ctlvp)
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#define IS_CTL_NAME(vp, name, l)((l == CODA_CONTROLLEN) \
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&& ((vp) == vtomi((vp))->mi_rootvp) \
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&& strncmp(name, CODA_CONTROL, l) == 0)
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/*
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* An enum to tell us whether something that will remove a reference
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* to a cnode was a downcall or not
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*/
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enum dc_status {
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IS_DOWNCALL = 6,
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NOT_DOWNCALL = 7
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};
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/* cfs_psdev.h */
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extern int coda_call(struct coda_mntinfo *, int, int *, void *);
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extern int coda_kernel_version;
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/* cfs_subr.h */
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extern int handleDownCall(int, union outputArgs *);
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extern void coda_unmounting(struct mount *);
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extern int coda_vmflush(struct cnode *);
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/* cfs_vnodeops.h */
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extern struct cnode *make_coda_node(CodaFid *, struct mount *, short);
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extern int coda_vnodeopstats_init(void);
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/* coda_vfsops.h */
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extern struct mount *devtomp(dev_t);
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/* sigh */
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#define CODA_RDWR ((u_long) 31)
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#endif /* _CNODE_H_ */
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