dead_vnops.c revision 1.35
1 /* $NetBSD: dead_vnops.c,v 1.35 2004/04/27 17:37:31 jrf 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)dead_vnops.c 8.2 (Berkeley) 11/21/94 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.35 2004/04/27 17:37:31 jrf Exp $"); 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 #include <sys/proc.h> 45 46 #include <miscfs/genfs/genfs.h> 47 48 /* 49 * Prototypes for dead operations on vnodes. 50 */ 51 int dead_lookup __P((void *)); 52 #define dead_create genfs_badop 53 #define dead_mknod genfs_badop 54 int dead_open __P((void *)); 55 #define dead_close genfs_nullop 56 #define dead_access genfs_ebadf 57 #define dead_getattr genfs_ebadf 58 #define dead_setattr genfs_ebadf 59 int dead_read __P((void *)); 60 int dead_write __P((void *)); 61 #define dead_lease_check genfs_nullop 62 #define dead_fcntl genfs_nullop 63 int dead_ioctl __P((void *)); 64 int dead_poll __P((void *)); 65 #define dead_mmap genfs_badop 66 #define dead_fsync genfs_nullop 67 #define dead_seek genfs_nullop 68 #define dead_remove genfs_badop 69 #define dead_link genfs_badop 70 #define dead_rename genfs_badop 71 #define dead_mkdir genfs_badop 72 #define dead_rmdir genfs_badop 73 #define dead_symlink genfs_badop 74 #define dead_readdir genfs_ebadf 75 #define dead_readlink genfs_ebadf 76 #define dead_abortop genfs_badop 77 #define dead_inactive genfs_nullop 78 #define dead_reclaim genfs_nullop 79 int dead_lock __P((void *)); 80 #define dead_unlock genfs_nullop 81 int dead_bmap __P((void *)); 82 int dead_strategy __P((void *)); 83 int dead_print __P((void *)); 84 #define dead_islocked genfs_nullop 85 #define dead_pathconf genfs_ebadf 86 #define dead_advlock genfs_ebadf 87 #define dead_blkatoff genfs_badop 88 #define dead_valloc genfs_badop 89 #define dead_vfree genfs_badop 90 #define dead_truncate genfs_nullop 91 #define dead_update genfs_nullop 92 #define dead_bwrite genfs_nullop 93 #define dead_revoke genfs_nullop 94 #define dead_putpages genfs_null_putpages 95 96 int chkvnlock __P((struct vnode *)); 97 98 int (**dead_vnodeop_p) __P((void *)); 99 100 const 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 { &vop_putpages_desc, dead_putpages }, /* putpages */ 146 { NULL, NULL } 147 }; 148 const struct vnodeopv_desc dead_vnodeop_opv_desc = 149 { &dead_vnodeop_p, dead_vnodeop_entries }; 150 151 /* 152 * Trivial lookup routine that always fails. 153 */ 154 /* ARGSUSED */ 155 int 156 dead_lookup(v) 157 void *v; 158 { 159 struct vop_lookup_args /* { 160 struct vnode * a_dvp; 161 struct vnode ** a_vpp; 162 struct componentname * a_cnp; 163 } */ *ap = v; 164 165 *ap->a_vpp = NULL; 166 return (ENOTDIR); 167 } 168 169 /* 170 * Open always fails as if device did not exist. 171 */ 172 /* ARGSUSED */ 173 int 174 dead_open(v) 175 void *v; 176 { 177 178 return (ENXIO); 179 } 180 181 /* 182 * Vnode op for read 183 */ 184 /* ARGSUSED */ 185 int 186 dead_read(v) 187 void *v; 188 { 189 struct vop_read_args /* { 190 struct vnode *a_vp; 191 struct uio *a_uio; 192 int a_ioflag; 193 struct ucred *a_cred; 194 } */ *ap = v; 195 196 if (chkvnlock(ap->a_vp)) 197 panic("dead_read: lock"); 198 /* 199 * Return EOF for tty devices, EIO for others 200 */ 201 if ((ap->a_vp->v_flag & VISTTY) == 0) 202 return (EIO); 203 return (0); 204 } 205 206 /* 207 * Vnode op for write 208 */ 209 /* ARGSUSED */ 210 int 211 dead_write(v) 212 void *v; 213 { 214 struct vop_write_args /* { 215 struct vnode *a_vp; 216 struct uio *a_uio; 217 int a_ioflag; 218 struct ucred *a_cred; 219 } */ *ap = v; 220 221 if (chkvnlock(ap->a_vp)) 222 panic("dead_write: lock"); 223 return (EIO); 224 } 225 226 /* 227 * Device ioctl operation. 228 */ 229 /* ARGSUSED */ 230 int 231 dead_ioctl(v) 232 void *v; 233 { 234 struct vop_ioctl_args /* { 235 struct vnode *a_vp; 236 u_long a_command; 237 void *a_data; 238 int a_fflag; 239 struct ucred *a_cred; 240 struct proc *a_p; 241 } */ *ap = v; 242 243 if (!chkvnlock(ap->a_vp)) 244 return (EBADF); 245 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 246 } 247 248 /* ARGSUSED */ 249 int 250 dead_poll(v) 251 void *v; 252 { 253 struct vop_poll_args /* { 254 struct vnode *a_vp; 255 int a_events; 256 struct proc *a_p; 257 } */ *ap = v; 258 259 /* 260 * Let the user find out that the descriptor is gone. 261 */ 262 return (ap->a_events); 263 } 264 265 /* 266 * Just call the device strategy routine 267 */ 268 int 269 dead_strategy(v) 270 void *v; 271 { 272 273 struct vop_strategy_args /* { 274 struct vnode *a_vp; 275 struct buf *a_bp; 276 } */ *ap = v; 277 if (ap->a_vp == NULL || !chkvnlock(ap->a_vp)) { 278 ap->a_bp->b_flags |= B_ERROR; 279 biodone(ap->a_bp); 280 return (EIO); 281 } 282 return (VOP_STRATEGY(ap->a_vp, ap->a_bp)); 283 } 284 285 /* 286 * Wait until the vnode has finished changing state. 287 */ 288 int 289 dead_lock(v) 290 void *v; 291 { 292 struct vop_lock_args /* { 293 struct vnode *a_vp; 294 int a_flags; 295 struct proc *a_p; 296 } */ *ap = v; 297 298 if (ap->a_flags & LK_INTERLOCK) { 299 simple_unlock(&ap->a_vp->v_interlock); 300 ap->a_flags &= ~LK_INTERLOCK; 301 } 302 if (!chkvnlock(ap->a_vp)) 303 return (0); 304 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 305 } 306 307 /* 308 * Wait until the vnode has finished changing state. 309 */ 310 int 311 dead_bmap(v) 312 void *v; 313 { 314 struct vop_bmap_args /* { 315 struct vnode *a_vp; 316 daddr_t a_bn; 317 struct vnode **a_vpp; 318 daddr_t *a_bnp; 319 int *a_runp; 320 } */ *ap = v; 321 322 if (!chkvnlock(ap->a_vp)) 323 return (EIO); 324 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 325 } 326 327 /* 328 * Print out the contents of a dead vnode. 329 */ 330 /* ARGSUSED */ 331 int 332 dead_print(v) 333 void *v; 334 { 335 printf("tag VT_NON, dead vnode\n"); 336 return 0; 337 } 338 339 /* 340 * We have to wait during times when the vnode is 341 * in a state of change. 342 */ 343 int 344 chkvnlock(vp) 345 struct vnode *vp; 346 { 347 int locked = 0; 348 349 while (vp->v_flag & VXLOCK) { 350 vp->v_flag |= VXWANT; 351 (void) tsleep(vp, PINOD, "deadchk", 0); 352 locked = 1; 353 } 354 return (locked); 355 } 356
Indexes created Tue Sep 23 23:09:58 GMT 2025