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_ */ 209 210