1 /* $NetBSD: dead_vnops.c,v 1.32 2001/12/06 04:27:40 chs Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)dead_vnops.c 8.2 (Berkeley) 11/21/94 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.32 2001/12/06 04:27:40 chs Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/time.h> 44 #include <sys/vnode.h> 45 #include <sys/errno.h> 46 #include <sys/namei.h> 47 #include <sys/buf.h> 48 #include <sys/proc.h> 49 50 #include <miscfs/genfs/genfs.h> 51 52 /* 53 * Prototypes for dead operations on vnodes. 54 */ 55 int dead_lookup __P((void *)); 56 #define dead_create genfs_badop 57 #define dead_mknod genfs_badop 58 int dead_open __P((void *)); 59 #define dead_close genfs_nullop 60 #define dead_access genfs_ebadf 61 #define dead_getattr genfs_ebadf 62 #define dead_setattr genfs_ebadf 63 int dead_read __P((void *)); 64 int dead_write __P((void *)); 65 #define dead_lease_check genfs_nullop 66 #define dead_fcntl genfs_nullop 67 int dead_ioctl __P((void *)); 68 int dead_poll __P((void *)); 69 #define dead_mmap genfs_badop 70 #define dead_fsync genfs_nullop 71 #define dead_seek genfs_nullop 72 #define dead_remove genfs_badop 73 #define dead_link genfs_badop 74 #define dead_rename genfs_badop 75 #define dead_mkdir genfs_badop 76 #define dead_rmdir genfs_badop 77 #define dead_symlink genfs_badop 78 #define dead_readdir genfs_ebadf 79 #define dead_readlink genfs_ebadf 80 #define dead_abortop genfs_badop 81 #define dead_inactive genfs_nullop 82 #define dead_reclaim genfs_nullop 83 int dead_lock __P((void *)); 84 #define dead_unlock genfs_nullop 85 int dead_bmap __P((void *)); 86 int dead_strategy __P((void *)); 87 int dead_print __P((void *)); 88 #define dead_islocked genfs_nullop 89 #define dead_pathconf genfs_ebadf 90 #define dead_advlock genfs_ebadf 91 #define dead_blkatoff genfs_badop 92 #define dead_valloc genfs_badop 93 #define dead_vfree genfs_badop 94 #define dead_truncate genfs_nullop 95 #define dead_update genfs_nullop 96 #define dead_bwrite genfs_nullop 97 #define dead_revoke genfs_nullop 98 #define dead_putpages genfs_null_putpages 99 100 int chkvnlock __P((struct vnode *)); 101 102 int (**dead_vnodeop_p) __P((void *)); 103 104 const struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 105 { &vop_default_desc, vn_default_error }, 106 { &vop_lookup_desc, dead_lookup }, /* lookup */ 107 { &vop_create_desc, dead_create }, /* create */ 108 { &vop_mknod_desc, dead_mknod }, /* mknod */ 109 { &vop_open_desc, dead_open }, /* open */ 110 { &vop_close_desc, dead_close }, /* close */ 111 { &vop_access_desc, dead_access }, /* access */ 112 { &vop_getattr_desc, dead_getattr }, /* getattr */ 113 { &vop_setattr_desc, dead_setattr }, /* setattr */ 114 { &vop_read_desc, dead_read }, /* read */ 115 { &vop_write_desc, dead_write }, /* write */ 116 { &vop_lease_desc, dead_lease_check }, /* lease */ 117 { &vop_fcntl_desc, dead_fcntl }, /* fcntl */ 118 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 119 { &vop_poll_desc, dead_poll }, /* poll */ 120 { &vop_revoke_desc, dead_revoke }, /* revoke */ 121 { &vop_mmap_desc, dead_mmap }, /* mmap */ 122 { &vop_fsync_desc, dead_fsync }, /* fsync */ 123 { &vop_seek_desc, dead_seek }, /* seek */ 124 { &vop_remove_desc, dead_remove }, /* remove */ 125 { &vop_link_desc, dead_link }, /* link */ 126 { &vop_rename_desc, dead_rename }, /* rename */ 127 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 128 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 129 { &vop_symlink_desc, dead_symlink }, /* symlink */ 130 { &vop_readdir_desc, dead_readdir }, /* readdir */ 131 { &vop_readlink_desc, dead_readlink }, /* readlink */ 132 { &vop_abortop_desc, dead_abortop }, /* abortop */ 133 { &vop_inactive_desc, dead_inactive }, /* inactive */ 134 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 135 { &vop_lock_desc, dead_lock }, /* lock */ 136 { &vop_unlock_desc, dead_unlock }, /* unlock */ 137 { &vop_bmap_desc, dead_bmap }, /* bmap */ 138 { &vop_strategy_desc, dead_strategy }, /* strategy */ 139 { &vop_print_desc, dead_print }, /* print */ 140 { &vop_islocked_desc, dead_islocked }, /* islocked */ 141 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 142 { &vop_advlock_desc, dead_advlock }, /* advlock */ 143 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 144 { &vop_valloc_desc, dead_valloc }, /* valloc */ 145 { &vop_vfree_desc, dead_vfree }, /* vfree */ 146 { &vop_truncate_desc, dead_truncate }, /* truncate */ 147 { &vop_update_desc, dead_update }, /* update */ 148 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 149 { &vop_putpages_desc, dead_putpages }, /* putpages */ 150 { NULL, NULL } 151 }; 152 const struct vnodeopv_desc dead_vnodeop_opv_desc = 153 { &dead_vnodeop_p, dead_vnodeop_entries }; 154 155 /* 156 * Trivial lookup routine that always fails. 157 */ 158 /* ARGSUSED */ 159 int 160 dead_lookup(v) 161 void *v; 162 { 163 struct vop_lookup_args /* { 164 struct vnode * a_dvp; 165 struct vnode ** a_vpp; 166 struct componentname * a_cnp; 167 } */ *ap = v; 168 169 *ap->a_vpp = NULL; 170 return (ENOTDIR); 171 } 172 173 /* 174 * Open always fails as if device did not exist. 175 */ 176 /* ARGSUSED */ 177 int 178 dead_open(v) 179 void *v; 180 { 181 182 return (ENXIO); 183 } 184 185 /* 186 * Vnode op for read 187 */ 188 /* ARGSUSED */ 189 int 190 dead_read(v) 191 void *v; 192 { 193 struct vop_read_args /* { 194 struct vnode *a_vp; 195 struct uio *a_uio; 196 int a_ioflag; 197 struct ucred *a_cred; 198 } */ *ap = v; 199 200 if (chkvnlock(ap->a_vp)) 201 panic("dead_read: lock"); 202 /* 203 * Return EOF for tty devices, EIO for others 204 */ 205 if ((ap->a_vp->v_flag & VISTTY) == 0) 206 return (EIO); 207 return (0); 208 } 209 210 /* 211 * Vnode op for write 212 */ 213 /* ARGSUSED */ 214 int 215 dead_write(v) 216 void *v; 217 { 218 struct vop_write_args /* { 219 struct vnode *a_vp; 220 struct uio *a_uio; 221 int a_ioflag; 222 struct ucred *a_cred; 223 } */ *ap = v; 224 225 if (chkvnlock(ap->a_vp)) 226 panic("dead_write: lock"); 227 return (EIO); 228 } 229 230 /* 231 * Device ioctl operation. 232 */ 233 /* ARGSUSED */ 234 int 235 dead_ioctl(v) 236 void *v; 237 { 238 struct vop_ioctl_args /* { 239 struct vnode *a_vp; 240 u_long a_command; 241 caddr_t a_data; 242 int a_fflag; 243 struct ucred *a_cred; 244 struct proc *a_p; 245 } */ *ap = v; 246 247 if (!chkvnlock(ap->a_vp)) 248 return (EBADF); 249 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 250 } 251 252 /* ARGSUSED */ 253 int 254 dead_poll(v) 255 void *v; 256 { 257 struct vop_poll_args /* { 258 struct vnode *a_vp; 259 int a_events; 260 struct proc *a_p; 261 } */ *ap = v; 262 263 /* 264 * Let the user find out that the descriptor is gone. 265 */ 266 return (ap->a_events); 267 } 268 269 /* 270 * Just call the device strategy routine 271 */ 272 int 273 dead_strategy(v) 274 void *v; 275 { 276 277 struct vop_strategy_args /* { 278 struct buf *a_bp; 279 } */ *ap = v; 280 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 281 ap->a_bp->b_flags |= B_ERROR; 282 biodone(ap->a_bp); 283 return (EIO); 284 } 285 return (VOP_STRATEGY(ap->a_bp)); 286 } 287 288 /* 289 * Wait until the vnode has finished changing state. 290 */ 291 int 292 dead_lock(v) 293 void *v; 294 { 295 struct vop_lock_args /* { 296 struct vnode *a_vp; 297 int a_flags; 298 struct proc *a_p; 299 } */ *ap = v; 300 301 if (ap->a_flags & LK_INTERLOCK) { 302 simple_unlock(&ap->a_vp->v_interlock); 303 ap->a_flags &= ~LK_INTERLOCK; 304 } 305 if (!chkvnlock(ap->a_vp)) 306 return (0); 307 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 308 } 309 310 /* 311 * Wait until the vnode has finished changing state. 312 */ 313 int 314 dead_bmap(v) 315 void *v; 316 { 317 struct vop_bmap_args /* { 318 struct vnode *a_vp; 319 daddr_t a_bn; 320 struct vnode **a_vpp; 321 daddr_t *a_bnp; 322 int *a_runp; 323 } */ *ap = v; 324 325 if (!chkvnlock(ap->a_vp)) 326 return (EIO); 327 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 328 } 329 330 /* 331 * Print out the contents of a dead vnode. 332 */ 333 /* ARGSUSED */ 334 int 335 dead_print(v) 336 void *v; 337 { 338 printf("tag VT_NON, dead vnode\n"); 339 return 0; 340 } 341 342 /* 343 * We have to wait during times when the vnode is 344 * in a state of change. 345 */ 346 int 347 chkvnlock(vp) 348 struct vnode *vp; 349 { 350 int locked = 0; 351 352 while (vp->v_flag & VXLOCK) { 353 vp->v_flag |= VXWANT; 354 (void) tsleep(vp, PINOD, "deadchk", 0); 355 locked = 1; 356 } 357 return (locked); 358 } 359