dead_vnops.c revision 1.26
1 /* $NetBSD: dead_vnops.c,v 1.26 1999/12/08 20:05:19 sommerfeld 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/param.h> 39 #include <sys/systm.h> 40 #include <sys/time.h> 41 #include <sys/vnode.h> 42 #include <sys/errno.h> 43 #include <sys/namei.h> 44 #include <sys/buf.h> 45 #include <sys/proc.h> 46 47 #include <miscfs/genfs/genfs.h> 48 49 /* 50 * Prototypes for dead operations on vnodes. 51 */ 52 int dead_lookup __P((void *)); 53 #define dead_create genfs_badop 54 #define dead_mknod genfs_badop 55 int dead_open __P((void *)); 56 #define dead_close genfs_nullop 57 #define dead_access genfs_ebadf 58 #define dead_getattr genfs_ebadf 59 #define dead_setattr genfs_ebadf 60 int dead_read __P((void *)); 61 int dead_write __P((void *)); 62 #define dead_lease_check genfs_nullop 63 #define dead_fcntl genfs_badop 64 int dead_ioctl __P((void *)); 65 int dead_poll __P((void *)); 66 #define dead_mmap genfs_badop 67 #define dead_fsync genfs_nullop 68 #define dead_seek genfs_nullop 69 #define dead_remove genfs_badop 70 #define dead_link genfs_badop 71 #define dead_rename genfs_badop 72 #define dead_mkdir genfs_badop 73 #define dead_rmdir genfs_badop 74 #define dead_symlink genfs_badop 75 #define dead_readdir genfs_ebadf 76 #define dead_readlink genfs_ebadf 77 #define dead_abortop genfs_badop 78 #define dead_inactive genfs_nullop 79 #define dead_reclaim genfs_nullop 80 int dead_lock __P((void *)); 81 #define dead_unlock genfs_nullop 82 int dead_bmap __P((void *)); 83 int dead_strategy __P((void *)); 84 int dead_print __P((void *)); 85 #define dead_islocked genfs_nullop 86 #define dead_pathconf genfs_ebadf 87 #define dead_advlock genfs_ebadf 88 #define dead_blkatoff genfs_badop 89 #define dead_valloc genfs_badop 90 #define dead_vfree genfs_badop 91 #define dead_truncate genfs_nullop 92 #define dead_update genfs_nullop 93 #define dead_bwrite genfs_nullop 94 #define dead_revoke genfs_nullop 95 96 int chkvnlock __P((struct vnode *)); 97 98 int (**dead_vnodeop_p) __P((void *)); 99 100 struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 101 { &vop_default_desc, vn_default_error }, 102 { &vop_lookup_desc, dead_lookup }, /* lookup */ 103 { &vop_create_desc, dead_create }, /* create */ 104 { &vop_mknod_desc, dead_mknod }, /* mknod */ 105 { &vop_open_desc, dead_open }, /* open */ 106 { &vop_close_desc, dead_close }, /* close */ 107 { &vop_access_desc, dead_access }, /* access */ 108 { &vop_getattr_desc, dead_getattr }, /* getattr */ 109 { &vop_setattr_desc, dead_setattr }, /* setattr */ 110 { &vop_read_desc, dead_read }, /* read */ 111 { &vop_write_desc, dead_write }, /* write */ 112 { &vop_lease_desc, dead_lease_check }, /* lease */ 113 { &vop_fcntl_desc, dead_fcntl }, /* fcntl */ 114 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 115 { &vop_poll_desc, dead_poll }, /* poll */ 116 { &vop_revoke_desc, dead_revoke }, /* revoke */ 117 { &vop_mmap_desc, dead_mmap }, /* mmap */ 118 { &vop_fsync_desc, dead_fsync }, /* fsync */ 119 { &vop_seek_desc, dead_seek }, /* seek */ 120 { &vop_remove_desc, dead_remove }, /* remove */ 121 { &vop_link_desc, dead_link }, /* link */ 122 { &vop_rename_desc, dead_rename }, /* rename */ 123 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 124 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 125 { &vop_symlink_desc, dead_symlink }, /* symlink */ 126 { &vop_readdir_desc, dead_readdir }, /* readdir */ 127 { &vop_readlink_desc, dead_readlink }, /* readlink */ 128 { &vop_abortop_desc, dead_abortop }, /* abortop */ 129 { &vop_inactive_desc, dead_inactive }, /* inactive */ 130 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 131 { &vop_lock_desc, dead_lock }, /* lock */ 132 { &vop_unlock_desc, dead_unlock }, /* unlock */ 133 { &vop_bmap_desc, dead_bmap }, /* bmap */ 134 { &vop_strategy_desc, dead_strategy }, /* strategy */ 135 { &vop_print_desc, dead_print }, /* print */ 136 { &vop_islocked_desc, dead_islocked }, /* islocked */ 137 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 138 { &vop_advlock_desc, dead_advlock }, /* advlock */ 139 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 140 { &vop_valloc_desc, dead_valloc }, /* valloc */ 141 { &vop_vfree_desc, dead_vfree }, /* vfree */ 142 { &vop_truncate_desc, dead_truncate }, /* truncate */ 143 { &vop_update_desc, dead_update }, /* update */ 144 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 145 { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } 146 }; 147 struct vnodeopv_desc dead_vnodeop_opv_desc = 148 { &dead_vnodeop_p, dead_vnodeop_entries }; 149 150 /* 151 * Trivial lookup routine that always fails. 152 */ 153 /* ARGSUSED */ 154 int 155 dead_lookup(v) 156 void *v; 157 { 158 struct vop_lookup_args /* { 159 struct vnode * a_dvp; 160 struct vnode ** a_vpp; 161 struct componentname * a_cnp; 162 } */ *ap = v; 163 164 *ap->a_vpp = NULL; 165 return (ENOTDIR); 166 } 167 168 /* 169 * Open always fails as if device did not exist. 170 */ 171 /* ARGSUSED */ 172 int 173 dead_open(v) 174 void *v; 175 { 176 177 return (ENXIO); 178 } 179 180 /* 181 * Vnode op for read 182 */ 183 /* ARGSUSED */ 184 int 185 dead_read(v) 186 void *v; 187 { 188 struct vop_read_args /* { 189 struct vnode *a_vp; 190 struct uio *a_uio; 191 int a_ioflag; 192 struct ucred *a_cred; 193 } */ *ap = v; 194 195 if (chkvnlock(ap->a_vp)) 196 panic("dead_read: lock"); 197 /* 198 * Return EOF for tty devices, EIO for others 199 */ 200 if ((ap->a_vp->v_flag & VISTTY) == 0) 201 return (EIO); 202 return (0); 203 } 204 205 /* 206 * Vnode op for write 207 */ 208 /* ARGSUSED */ 209 int 210 dead_write(v) 211 void *v; 212 { 213 struct vop_write_args /* { 214 struct vnode *a_vp; 215 struct uio *a_uio; 216 int a_ioflag; 217 struct ucred *a_cred; 218 } */ *ap = v; 219 220 if (chkvnlock(ap->a_vp)) 221 panic("dead_write: lock"); 222 return (EIO); 223 } 224 225 /* 226 * Device ioctl operation. 227 */ 228 /* ARGSUSED */ 229 int 230 dead_ioctl(v) 231 void *v; 232 { 233 struct vop_ioctl_args /* { 234 struct vnode *a_vp; 235 u_long a_command; 236 caddr_t a_data; 237 int a_fflag; 238 struct ucred *a_cred; 239 struct proc *a_p; 240 } */ *ap = v; 241 242 if (!chkvnlock(ap->a_vp)) 243 return (EBADF); 244 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 245 } 246 247 /* ARGSUSED */ 248 int 249 dead_poll(v) 250 void *v; 251 { 252 struct vop_poll_args /* { 253 struct vnode *a_vp; 254 int a_events; 255 struct proc *a_p; 256 } */ *ap = v; 257 258 /* 259 * Let the user find out that the descriptor is gone. 260 */ 261 return (ap->a_events); 262 } 263 264 /* 265 * Just call the device strategy routine 266 */ 267 int 268 dead_strategy(v) 269 void *v; 270 { 271 272 struct vop_strategy_args /* { 273 struct buf *a_bp; 274 } */ *ap = v; 275 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 276 ap->a_bp->b_flags |= B_ERROR; 277 biodone(ap->a_bp); 278 return (EIO); 279 } 280 return (VOP_STRATEGY(ap->a_bp)); 281 } 282 283 /* 284 * Wait until the vnode has finished changing state. 285 */ 286 int 287 dead_lock(v) 288 void *v; 289 { 290 struct vop_lock_args /* { 291 struct vnode *a_vp; 292 int a_flags; 293 struct proc *a_p; 294 } */ *ap = v; 295 296 if (ap->a_flags & LK_INTERLOCK) { 297 simple_unlock(&ap->a_vp->v_interlock); 298 ap->a_flags &= ~LK_INTERLOCK; 299 } 300 if (!chkvnlock(ap->a_vp)) 301 return (0); 302 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 303 } 304 305 /* 306 * Wait until the vnode has finished changing state. 307 */ 308 int 309 dead_bmap(v) 310 void *v; 311 { 312 struct vop_bmap_args /* { 313 struct vnode *a_vp; 314 daddr_t a_bn; 315 struct vnode **a_vpp; 316 daddr_t *a_bnp; 317 int *a_runp; 318 } */ *ap = v; 319 320 if (!chkvnlock(ap->a_vp)) 321 return (EIO); 322 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 323 } 324 325 /* 326 * Print out the contents of a dead vnode. 327 */ 328 /* ARGSUSED */ 329 int 330 dead_print(v) 331 void *v; 332 { 333 printf("tag VT_NON, dead vnode\n"); 334 return 0; 335 } 336 337 /* 338 * We have to wait during times when the vnode is 339 * in a state of change. 340 */ 341 int 342 chkvnlock(vp) 343 register struct vnode *vp; 344 { 345 int locked = 0; 346 347 while (vp->v_flag & VXLOCK) { 348 vp->v_flag |= VXWANT; 349 sleep((caddr_t)vp, PINOD); 350 locked = 1; 351 } 352 return (locked); 353 } 354
Indexes created Tue Sep 23 07:09:52 GMT 2025