dead_vnops.c revision 1.8
1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93 34 * $Id: dead_vnops.c,v 1.8 1994/06/08 11:33:09 mycroft Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/time.h> 40 #include <sys/vnode.h> 41 #include <sys/errno.h> 42 #include <sys/namei.h> 43 #include <sys/buf.h> 44 45 /* 46 * Prototypes for dead operations on vnodes. 47 */ 48 int dead_badop(), 49 dead_ebadf(); 50 int dead_lookup __P((struct vop_lookup_args *)); 51 #define dead_create ((int (*) __P((struct vop_create_args *)))dead_badop) 52 #define dead_mknod ((int (*) __P((struct vop_mknod_args *)))dead_badop) 53 int dead_open __P((struct vop_open_args *)); 54 #define dead_close ((int (*) __P((struct vop_close_args *)))nullop) 55 #define dead_access ((int (*) __P((struct vop_access_args *)))dead_ebadf) 56 #define dead_getattr ((int (*) __P((struct vop_getattr_args *)))dead_ebadf) 57 #define dead_setattr ((int (*) __P((struct vop_setattr_args *)))dead_ebadf) 58 int dead_read __P((struct vop_read_args *)); 59 int dead_write __P((struct vop_write_args *)); 60 int dead_ioctl __P((struct vop_ioctl_args *)); 61 int dead_select __P((struct vop_select_args *)); 62 #define dead_mmap ((int (*) __P((struct vop_mmap_args *)))dead_badop) 63 #define dead_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 64 #define dead_seek ((int (*) __P((struct vop_seek_args *)))nullop) 65 #define dead_remove ((int (*) __P((struct vop_remove_args *)))dead_badop) 66 #define dead_link ((int (*) __P((struct vop_link_args *)))dead_badop) 67 #define dead_rename ((int (*) __P((struct vop_rename_args *)))dead_badop) 68 #define dead_mkdir ((int (*) __P((struct vop_mkdir_args *)))dead_badop) 69 #define dead_rmdir ((int (*) __P((struct vop_rmdir_args *)))dead_badop) 70 #define dead_symlink ((int (*) __P((struct vop_symlink_args *)))dead_badop) 71 #define dead_readdir ((int (*) __P((struct vop_readdir_args *)))dead_ebadf) 72 #define dead_readlink ((int (*) __P((struct vop_readlink_args *)))dead_ebadf) 73 #define dead_abortop ((int (*) __P((struct vop_abortop_args *)))dead_badop) 74 #define dead_inactive ((int (*) __P((struct vop_inactive_args *)))nullop) 75 #define dead_reclaim ((int (*) __P((struct vop_reclaim_args *)))nullop) 76 int dead_lock __P((struct vop_lock_args *)); 77 #define dead_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 78 int dead_bmap __P((struct vop_bmap_args *)); 79 int dead_strategy __P((struct vop_strategy_args *)); 80 int dead_print __P((struct vop_print_args *)); 81 #define dead_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 82 #define dead_pathconf ((int (*) __P((struct vop_pathconf_args *)))dead_ebadf) 83 #define dead_advlock ((int (*) __P((struct vop_advlock_args *)))dead_ebadf) 84 #define dead_blkatoff ((int (*) __P((struct vop_blkatoff_args *)))dead_badop) 85 #define dead_valloc ((int (*) __P((struct vop_valloc_args *)))dead_badop) 86 #define dead_vfree ((int (*) __P((struct vop_vfree_args *)))dead_badop) 87 #define dead_truncate ((int (*) __P((struct vop_truncate_args *)))nullop) 88 #define dead_update ((int (*) __P((struct vop_update_args *)))nullop) 89 #define dead_bwrite ((int (*) __P((struct vop_bwrite_args *)))nullop) 90 91 int (**dead_vnodeop_p)(); 92 struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 93 { &vop_default_desc, vn_default_error }, 94 { &vop_lookup_desc, dead_lookup }, /* lookup */ 95 { &vop_create_desc, dead_create }, /* create */ 96 { &vop_mknod_desc, dead_mknod }, /* mknod */ 97 { &vop_open_desc, dead_open }, /* open */ 98 { &vop_close_desc, dead_close }, /* close */ 99 { &vop_access_desc, dead_access }, /* access */ 100 { &vop_getattr_desc, dead_getattr }, /* getattr */ 101 { &vop_setattr_desc, dead_setattr }, /* setattr */ 102 { &vop_read_desc, dead_read }, /* read */ 103 { &vop_write_desc, dead_write }, /* write */ 104 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 105 { &vop_select_desc, dead_select }, /* select */ 106 { &vop_mmap_desc, dead_mmap }, /* mmap */ 107 { &vop_fsync_desc, dead_fsync }, /* fsync */ 108 { &vop_seek_desc, dead_seek }, /* seek */ 109 { &vop_remove_desc, dead_remove }, /* remove */ 110 { &vop_link_desc, dead_link }, /* link */ 111 { &vop_rename_desc, dead_rename }, /* rename */ 112 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 113 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 114 { &vop_symlink_desc, dead_symlink }, /* symlink */ 115 { &vop_readdir_desc, dead_readdir }, /* readdir */ 116 { &vop_readlink_desc, dead_readlink }, /* readlink */ 117 { &vop_abortop_desc, dead_abortop }, /* abortop */ 118 { &vop_inactive_desc, dead_inactive }, /* inactive */ 119 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 120 { &vop_lock_desc, dead_lock }, /* lock */ 121 { &vop_unlock_desc, dead_unlock }, /* unlock */ 122 { &vop_bmap_desc, dead_bmap }, /* bmap */ 123 { &vop_strategy_desc, dead_strategy }, /* strategy */ 124 { &vop_print_desc, dead_print }, /* print */ 125 { &vop_islocked_desc, dead_islocked }, /* islocked */ 126 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 127 { &vop_advlock_desc, dead_advlock }, /* advlock */ 128 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 129 { &vop_valloc_desc, dead_valloc }, /* valloc */ 130 { &vop_vfree_desc, dead_vfree }, /* vfree */ 131 { &vop_truncate_desc, dead_truncate }, /* truncate */ 132 { &vop_update_desc, dead_update }, /* update */ 133 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 134 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 135 }; 136 struct vnodeopv_desc dead_vnodeop_opv_desc = 137 { &dead_vnodeop_p, dead_vnodeop_entries }; 138 139 /* 140 * Trivial lookup routine that always fails. 141 */ 142 /* ARGSUSED */ 143 int 144 dead_lookup(ap) 145 struct vop_lookup_args /* { 146 struct vnode * a_dvp; 147 struct vnode ** a_vpp; 148 struct componentname * a_cnp; 149 } */ *ap; 150 { 151 152 *ap->a_vpp = NULL; 153 return (ENOTDIR); 154 } 155 156 /* 157 * Open always fails as if device did not exist. 158 */ 159 /* ARGSUSED */ 160 dead_open(ap) 161 struct vop_open_args /* { 162 struct vnode *a_vp; 163 int a_mode; 164 struct ucred *a_cred; 165 struct proc *a_p; 166 } */ *ap; 167 { 168 169 return (ENXIO); 170 } 171 172 /* 173 * Vnode op for read 174 */ 175 /* ARGSUSED */ 176 dead_read(ap) 177 struct vop_read_args /* { 178 struct vnode *a_vp; 179 struct uio *a_uio; 180 int a_ioflag; 181 struct ucred *a_cred; 182 } */ *ap; 183 { 184 185 if (chkvnlock(ap->a_vp)) 186 panic("dead_read: lock"); 187 /* 188 * Return EOF for character devices, EIO for others 189 */ 190 if (ap->a_vp->v_type != VCHR) 191 return (EIO); 192 return (0); 193 } 194 195 /* 196 * Vnode op for write 197 */ 198 /* ARGSUSED */ 199 dead_write(ap) 200 struct vop_write_args /* { 201 struct vnode *a_vp; 202 struct uio *a_uio; 203 int a_ioflag; 204 struct ucred *a_cred; 205 } */ *ap; 206 { 207 208 if (chkvnlock(ap->a_vp)) 209 panic("dead_write: lock"); 210 return (EIO); 211 } 212 213 /* 214 * Device ioctl operation. 215 */ 216 /* ARGSUSED */ 217 dead_ioctl(ap) 218 struct vop_ioctl_args /* { 219 struct vnode *a_vp; 220 int a_command; 221 caddr_t a_data; 222 int a_fflag; 223 struct ucred *a_cred; 224 struct proc *a_p; 225 } */ *ap; 226 { 227 228 if (!chkvnlock(ap->a_vp)) 229 return (EBADF); 230 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 231 } 232 233 /* ARGSUSED */ 234 dead_select(ap) 235 struct vop_select_args /* { 236 struct vnode *a_vp; 237 int a_which; 238 int a_fflags; 239 struct ucred *a_cred; 240 struct proc *a_p; 241 } */ *ap; 242 { 243 244 /* 245 * Let the user find out that the descriptor is gone. 246 */ 247 return (1); 248 } 249 250 /* 251 * Just call the device strategy routine 252 */ 253 dead_strategy(ap) 254 struct vop_strategy_args /* { 255 struct buf *a_bp; 256 } */ *ap; 257 { 258 259 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 260 ap->a_bp->b_flags |= B_ERROR; 261 biodone(ap->a_bp); 262 return (EIO); 263 } 264 return (VOP_STRATEGY(ap->a_bp)); 265 } 266 267 /* 268 * Wait until the vnode has finished changing state. 269 */ 270 dead_lock(ap) 271 struct vop_lock_args /* { 272 struct vnode *a_vp; 273 } */ *ap; 274 { 275 276 if (!chkvnlock(ap->a_vp)) 277 return (0); 278 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 279 } 280 281 /* 282 * Wait until the vnode has finished changing state. 283 */ 284 dead_bmap(ap) 285 struct vop_bmap_args /* { 286 struct vnode *a_vp; 287 daddr_t a_bn; 288 struct vnode **a_vpp; 289 daddr_t *a_bnp; 290 int *a_runp; 291 } */ *ap; 292 { 293 294 if (!chkvnlock(ap->a_vp)) 295 return (EIO); 296 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 297 } 298 299 /* 300 * Print out the contents of a dead vnode. 301 */ 302 /* ARGSUSED */ 303 dead_print(ap) 304 struct vop_print_args /* { 305 struct vnode *a_vp; 306 } */ *ap; 307 { 308 309 printf("tag VT_NON, dead vnode\n"); 310 } 311 312 /* 313 * Empty vnode failed operation 314 */ 315 dead_ebadf() 316 { 317 318 return (EBADF); 319 } 320 321 /* 322 * Empty vnode bad operation 323 */ 324 dead_badop() 325 { 326 327 panic("dead_badop called"); 328 /* NOTREACHED */ 329 } 330 331 /* 332 * Empty vnode null operation 333 */ 334 dead_nullop() 335 { 336 337 return (0); 338 } 339 340 /* 341 * We have to wait during times when the vnode is 342 * in a state of change. 343 */ 344 chkvnlock(vp) 345 register struct vnode *vp; 346 { 347 int locked = 0; 348 349 while (vp->v_flag & VXLOCK) { 350 vp->v_flag |= VXWANT; 351 sleep((caddr_t)vp, PINOD); 352 locked = 1; 353 } 354 return (locked); 355 } 356
Indexes created Mon Sep 22 21:09:42 GMT 2025