1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)dead_vnops.c 7.23 (Berkeley) 07/12/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/time.h> 13 #include <sys/vnode.h> 14 #include <sys/errno.h> 15 #include <sys/namei.h> 16 #include <sys/buf.h> 17 18 /* 19 * Prototypes for dead operations on vnodes. 20 */ 21 int dead_badop(), 22 dead_ebadf(); 23 int dead_lookup __P((struct vop_lookup_args *)); 24 #define dead_create ((int (*) __P((struct vop_create_args *)))dead_badop) 25 #define dead_mknod ((int (*) __P((struct vop_mknod_args *)))dead_badop) 26 int dead_open __P((struct vop_open_args *)); 27 #define dead_close ((int (*) __P((struct vop_close_args *)))nullop) 28 #define dead_access ((int (*) __P((struct vop_access_args *)))dead_ebadf) 29 #define dead_getattr ((int (*) __P((struct vop_getattr_args *)))dead_ebadf) 30 #define dead_setattr ((int (*) __P((struct vop_setattr_args *)))dead_ebadf) 31 int dead_read __P((struct vop_read_args *)); 32 int dead_write __P((struct vop_write_args *)); 33 int dead_ioctl __P((struct vop_ioctl_args *)); 34 int dead_select __P((struct vop_select_args *)); 35 #define dead_mmap ((int (*) __P((struct vop_mmap_args *)))dead_badop) 36 #define dead_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 37 #define dead_seek ((int (*) __P((struct vop_seek_args *)))nullop) 38 #define dead_remove ((int (*) __P((struct vop_remove_args *)))dead_badop) 39 #define dead_link ((int (*) __P((struct vop_link_args *)))dead_badop) 40 #define dead_rename ((int (*) __P((struct vop_rename_args *)))dead_badop) 41 #define dead_mkdir ((int (*) __P((struct vop_mkdir_args *)))dead_badop) 42 #define dead_rmdir ((int (*) __P((struct vop_rmdir_args *)))dead_badop) 43 #define dead_symlink ((int (*) __P((struct vop_symlink_args *)))dead_badop) 44 #define dead_readdir ((int (*) __P((struct vop_readdir_args *)))dead_ebadf) 45 #define dead_readlink ((int (*) __P((struct vop_readlink_args *)))dead_ebadf) 46 #define dead_abortop ((int (*) __P((struct vop_abortop_args *)))dead_badop) 47 #define dead_inactive ((int (*) __P((struct vop_inactive_args *)))nullop) 48 #define dead_reclaim ((int (*) __P((struct vop_reclaim_args *)))nullop) 49 int dead_lock __P((struct vop_lock_args *)); 50 #define dead_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 51 int dead_bmap __P((struct vop_bmap_args *)); 52 int dead_strategy __P((struct vop_strategy_args *)); 53 int dead_print __P((struct vop_print_args *)); 54 #define dead_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 55 #define dead_advlock ((int (*) __P((struct vop_advlock_args *)))dead_ebadf) 56 #define dead_blkatoff ((int (*) __P((struct vop_blkatoff_args *)))dead_badop) 57 #define dead_valloc ((int (*) __P((struct vop_valloc_args *)))dead_badop) 58 #define dead_vfree ((int (*) __P((struct vop_vfree_args *)))dead_badop) 59 #define dead_truncate ((int (*) __P((struct vop_truncate_args *)))nullop) 60 #define dead_update ((int (*) __P((struct vop_update_args *)))nullop) 61 #define dead_bwrite ((int (*) __P((struct vop_bwrite_args *)))nullop) 62 63 int (**dead_vnodeop_p)(); 64 struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 65 { &vop_default_desc, vn_default_error }, 66 { &vop_lookup_desc, dead_lookup }, /* lookup */ 67 { &vop_create_desc, dead_create }, /* create */ 68 { &vop_mknod_desc, dead_mknod }, /* mknod */ 69 { &vop_open_desc, dead_open }, /* open */ 70 { &vop_close_desc, dead_close }, /* close */ 71 { &vop_access_desc, dead_access }, /* access */ 72 { &vop_getattr_desc, dead_getattr }, /* getattr */ 73 { &vop_setattr_desc, dead_setattr }, /* setattr */ 74 { &vop_read_desc, dead_read }, /* read */ 75 { &vop_write_desc, dead_write }, /* write */ 76 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 77 { &vop_select_desc, dead_select }, /* select */ 78 { &vop_mmap_desc, dead_mmap }, /* mmap */ 79 { &vop_fsync_desc, dead_fsync }, /* fsync */ 80 { &vop_seek_desc, dead_seek }, /* seek */ 81 { &vop_remove_desc, dead_remove }, /* remove */ 82 { &vop_link_desc, dead_link }, /* link */ 83 { &vop_rename_desc, dead_rename }, /* rename */ 84 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 85 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 86 { &vop_symlink_desc, dead_symlink }, /* symlink */ 87 { &vop_readdir_desc, dead_readdir }, /* readdir */ 88 { &vop_readlink_desc, dead_readlink }, /* readlink */ 89 { &vop_abortop_desc, dead_abortop }, /* abortop */ 90 { &vop_inactive_desc, dead_inactive }, /* inactive */ 91 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 92 { &vop_lock_desc, dead_lock }, /* lock */ 93 { &vop_unlock_desc, dead_unlock }, /* unlock */ 94 { &vop_bmap_desc, dead_bmap }, /* bmap */ 95 { &vop_strategy_desc, dead_strategy }, /* strategy */ 96 { &vop_print_desc, dead_print }, /* print */ 97 { &vop_islocked_desc, dead_islocked }, /* islocked */ 98 { &vop_advlock_desc, dead_advlock }, /* advlock */ 99 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 100 { &vop_valloc_desc, dead_valloc }, /* valloc */ 101 { &vop_vfree_desc, dead_vfree }, /* vfree */ 102 { &vop_truncate_desc, dead_truncate }, /* truncate */ 103 { &vop_update_desc, dead_update }, /* update */ 104 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 105 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 106 }; 107 struct vnodeopv_desc dead_vnodeop_opv_desc = 108 { &dead_vnodeop_p, dead_vnodeop_entries }; 109 110 /* 111 * Trivial lookup routine that always fails. 112 */ 113 /* ARGSUSED */ 114 int 115 dead_lookup(ap) 116 struct vop_lookup_args /* { 117 struct vnode * a_dvp; 118 struct vnode ** a_vpp; 119 struct componentname * a_cnp; 120 } */ *ap; 121 { 122 123 *ap->a_vpp = NULL; 124 return (ENOTDIR); 125 } 126 127 /* 128 * Open always fails as if device did not exist. 129 */ 130 /* ARGSUSED */ 131 dead_open(ap) 132 struct vop_open_args /* { 133 struct vnode *a_vp; 134 int a_mode; 135 struct ucred *a_cred; 136 struct proc *a_p; 137 } */ *ap; 138 { 139 140 return (ENXIO); 141 } 142 143 /* 144 * Vnode op for read 145 */ 146 /* ARGSUSED */ 147 dead_read(ap) 148 struct vop_read_args /* { 149 struct vnode *a_vp; 150 struct uio *a_uio; 151 int a_ioflag; 152 struct ucred *a_cred; 153 } */ *ap; 154 { 155 156 if (chkvnlock(ap->a_vp)) 157 panic("dead_read: lock"); 158 /* 159 * Return EOF for character devices, EIO for others 160 */ 161 if (ap->a_vp->v_type != VCHR) 162 return (EIO); 163 return (0); 164 } 165 166 /* 167 * Vnode op for write 168 */ 169 /* ARGSUSED */ 170 dead_write(ap) 171 struct vop_write_args /* { 172 struct vnode *a_vp; 173 struct uio *a_uio; 174 int a_ioflag; 175 struct ucred *a_cred; 176 } */ *ap; 177 { 178 179 if (chkvnlock(ap->a_vp)) 180 panic("dead_write: lock"); 181 return (EIO); 182 } 183 184 /* 185 * Device ioctl operation. 186 */ 187 /* ARGSUSED */ 188 dead_ioctl(ap) 189 struct vop_ioctl_args /* { 190 struct vnode *a_vp; 191 int a_command; 192 caddr_t a_data; 193 int a_fflag; 194 struct ucred *a_cred; 195 struct proc *a_p; 196 } */ *ap; 197 { 198 199 if (!chkvnlock(ap->a_vp)) 200 return (EBADF); 201 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 202 } 203 204 /* ARGSUSED */ 205 dead_select(ap) 206 struct vop_select_args /* { 207 struct vnode *a_vp; 208 int a_which; 209 int a_fflags; 210 struct ucred *a_cred; 211 struct proc *a_p; 212 } */ *ap; 213 { 214 215 /* 216 * Let the user find out that the descriptor is gone. 217 */ 218 return (1); 219 } 220 221 /* 222 * Just call the device strategy routine 223 */ 224 dead_strategy(ap) 225 struct vop_strategy_args /* { 226 struct buf *a_bp; 227 } */ *ap; 228 { 229 230 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 231 ap->a_bp->b_flags |= B_ERROR; 232 biodone(ap->a_bp); 233 return (EIO); 234 } 235 return (VOP_STRATEGY(ap->a_bp)); 236 } 237 238 /* 239 * Wait until the vnode has finished changing state. 240 */ 241 dead_lock(ap) 242 struct vop_lock_args /* { 243 struct vnode *a_vp; 244 } */ *ap; 245 { 246 247 if (!chkvnlock(ap->a_vp)) 248 return (0); 249 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 250 } 251 252 /* 253 * Wait until the vnode has finished changing state. 254 */ 255 dead_bmap(ap) 256 struct vop_bmap_args /* { 257 struct vnode *a_vp; 258 daddr_t a_bn; 259 struct vnode **a_vpp; 260 daddr_t *a_bnp; 261 } */ *ap; 262 { 263 264 if (!chkvnlock(ap->a_vp)) 265 return (EIO); 266 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp)); 267 } 268 269 /* 270 * Print out the contents of a dead vnode. 271 */ 272 /* ARGSUSED */ 273 dead_print(ap) 274 struct vop_print_args /* { 275 struct vnode *a_vp; 276 } */ *ap; 277 { 278 279 printf("tag VT_NON, dead vnode\n"); 280 } 281 282 /* 283 * Empty vnode failed operation 284 */ 285 dead_ebadf() 286 { 287 288 return (EBADF); 289 } 290 291 /* 292 * Empty vnode bad operation 293 */ 294 dead_badop() 295 { 296 297 panic("dead_badop called"); 298 /* NOTREACHED */ 299 } 300 301 /* 302 * Empty vnode null operation 303 */ 304 dead_nullop() 305 { 306 307 return (0); 308 } 309 310 /* 311 * We have to wait during times when the vnode is 312 * in a state of change. 313 */ 314 chkvnlock(vp) 315 register struct vnode *vp; 316 { 317 int locked = 0; 318 319 while (vp->v_flag & VXLOCK) { 320 vp->v_flag |= VXWANT; 321 sleep((caddr_t)vp, PINOD); 322 locked = 1; 323 } 324 return (locked); 325 } 326