dead_vnops.c revision 1.41.2.1
1 /* $NetBSD: dead_vnops.c,v 1.41.2.1 2006/12/12 12:58:39 tron 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 1.41.2.1 2006/12/12 12:58:39 tron 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(void *); 52 #define dead_create genfs_badop 53 #define dead_mknod genfs_badop 54 int dead_open(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(void *); 60 int dead_write(void *); 61 #define dead_lease_check genfs_nullop 62 #define dead_fcntl genfs_nullop 63 int dead_ioctl(void *); 64 int dead_poll(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(void *); 80 #define dead_unlock genfs_nullop 81 int dead_bmap(void *); 82 int dead_strategy(void *); 83 int dead_print(void *); 84 #define dead_islocked genfs_nullop 85 #define dead_pathconf genfs_ebadf 86 #define dead_advlock genfs_ebadf 87 #define dead_bwrite genfs_nullop 88 #define dead_revoke genfs_nullop 89 int dead_getpages(void *); 90 #define dead_putpages genfs_null_putpages 91 92 int chkvnlock(struct vnode *); 93 94 int (**dead_vnodeop_p)(void *); 95 96 const struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 97 { &vop_default_desc, vn_default_error }, 98 { &vop_lookup_desc, dead_lookup }, /* lookup */ 99 { &vop_create_desc, dead_create }, /* create */ 100 { &vop_mknod_desc, dead_mknod }, /* mknod */ 101 { &vop_open_desc, dead_open }, /* open */ 102 { &vop_close_desc, dead_close }, /* close */ 103 { &vop_access_desc, dead_access }, /* access */ 104 { &vop_getattr_desc, dead_getattr }, /* getattr */ 105 { &vop_setattr_desc, dead_setattr }, /* setattr */ 106 { &vop_read_desc, dead_read }, /* read */ 107 { &vop_write_desc, dead_write }, /* write */ 108 { &vop_lease_desc, dead_lease_check }, /* lease */ 109 { &vop_fcntl_desc, dead_fcntl }, /* fcntl */ 110 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 111 { &vop_poll_desc, dead_poll }, /* poll */ 112 { &vop_revoke_desc, dead_revoke }, /* revoke */ 113 { &vop_mmap_desc, dead_mmap }, /* mmap */ 114 { &vop_fsync_desc, dead_fsync }, /* fsync */ 115 { &vop_seek_desc, dead_seek }, /* seek */ 116 { &vop_remove_desc, dead_remove }, /* remove */ 117 { &vop_link_desc, dead_link }, /* link */ 118 { &vop_rename_desc, dead_rename }, /* rename */ 119 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 120 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 121 { &vop_symlink_desc, dead_symlink }, /* symlink */ 122 { &vop_readdir_desc, dead_readdir }, /* readdir */ 123 { &vop_readlink_desc, dead_readlink }, /* readlink */ 124 { &vop_abortop_desc, dead_abortop }, /* abortop */ 125 { &vop_inactive_desc, dead_inactive }, /* inactive */ 126 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 127 { &vop_lock_desc, dead_lock }, /* lock */ 128 { &vop_unlock_desc, dead_unlock }, /* unlock */ 129 { &vop_bmap_desc, dead_bmap }, /* bmap */ 130 { &vop_strategy_desc, dead_strategy }, /* strategy */ 131 { &vop_print_desc, dead_print }, /* print */ 132 { &vop_islocked_desc, dead_islocked }, /* islocked */ 133 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 134 { &vop_advlock_desc, dead_advlock }, /* advlock */ 135 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 136 { &vop_getpages_desc, dead_getpages }, /* getpages */ 137 { &vop_putpages_desc, dead_putpages }, /* putpages */ 138 { NULL, NULL } 139 }; 140 const struct vnodeopv_desc dead_vnodeop_opv_desc = 141 { &dead_vnodeop_p, dead_vnodeop_entries }; 142 143 /* 144 * Trivial lookup routine that always fails. 145 */ 146 /* ARGSUSED */ 147 int 148 dead_lookup(v) 149 void *v; 150 { 151 struct vop_lookup_args /* { 152 struct vnode * a_dvp; 153 struct vnode ** a_vpp; 154 struct componentname * a_cnp; 155 } */ *ap = v; 156 157 *ap->a_vpp = NULL; 158 return (ENOTDIR); 159 } 160 161 /* 162 * Open always fails as if device did not exist. 163 */ 164 /* ARGSUSED */ 165 int 166 dead_open(void *v) 167 { 168 169 return (ENXIO); 170 } 171 172 /* 173 * Vnode op for read 174 */ 175 /* ARGSUSED */ 176 int 177 dead_read(v) 178 void *v; 179 { 180 struct vop_read_args /* { 181 struct vnode *a_vp; 182 struct uio *a_uio; 183 int a_ioflag; 184 kauth_cred_t a_cred; 185 } */ *ap = v; 186 187 if (chkvnlock(ap->a_vp)) 188 panic("dead_read: lock"); 189 /* 190 * Return EOF for tty devices, EIO for others 191 */ 192 if ((ap->a_vp->v_flag & VISTTY) == 0) 193 return (EIO); 194 return (0); 195 } 196 197 /* 198 * Vnode op for write 199 */ 200 /* ARGSUSED */ 201 int 202 dead_write(v) 203 void *v; 204 { 205 struct vop_write_args /* { 206 struct vnode *a_vp; 207 struct uio *a_uio; 208 int a_ioflag; 209 kauth_cred_t a_cred; 210 } */ *ap = v; 211 212 if (chkvnlock(ap->a_vp)) 213 panic("dead_write: lock"); 214 return (EIO); 215 } 216 217 /* 218 * Device ioctl operation. 219 */ 220 /* ARGSUSED */ 221 int 222 dead_ioctl(v) 223 void *v; 224 { 225 struct vop_ioctl_args /* { 226 struct vnode *a_vp; 227 u_long a_command; 228 void *a_data; 229 int a_fflag; 230 kauth_cred_t a_cred; 231 struct lwp *a_l; 232 } */ *ap = v; 233 234 if (!chkvnlock(ap->a_vp)) 235 return (EBADF); 236 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 237 } 238 239 /* ARGSUSED */ 240 int 241 dead_poll(v) 242 void *v; 243 { 244 struct vop_poll_args /* { 245 struct vnode *a_vp; 246 int a_events; 247 struct lwp *a_l; 248 } */ *ap = v; 249 250 /* 251 * Let the user find out that the descriptor is gone. 252 */ 253 return (ap->a_events); 254 } 255 256 /* 257 * Just call the device strategy routine 258 */ 259 int 260 dead_strategy(v) 261 void *v; 262 { 263 264 struct vop_strategy_args /* { 265 struct vnode *a_vp; 266 struct buf *a_bp; 267 } */ *ap = v; 268 if (ap->a_vp == NULL || !chkvnlock(ap->a_vp)) { 269 ap->a_bp->b_flags |= B_ERROR; 270 biodone(ap->a_bp); 271 return (EIO); 272 } 273 return (VOP_STRATEGY(ap->a_vp, ap->a_bp)); 274 } 275 276 /* 277 * Wait until the vnode has finished changing state. 278 */ 279 int 280 dead_lock(v) 281 void *v; 282 { 283 struct vop_lock_args /* { 284 struct vnode *a_vp; 285 int a_flags; 286 struct proc *a_p; 287 } */ *ap = v; 288 289 if (ap->a_flags & LK_INTERLOCK) { 290 simple_unlock(&ap->a_vp->v_interlock); 291 ap->a_flags &= ~LK_INTERLOCK; 292 } 293 if (!chkvnlock(ap->a_vp)) 294 return (0); 295 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 296 } 297 298 /* 299 * Wait until the vnode has finished changing state. 300 */ 301 int 302 dead_bmap(v) 303 void *v; 304 { 305 struct vop_bmap_args /* { 306 struct vnode *a_vp; 307 daddr_t a_bn; 308 struct vnode **a_vpp; 309 daddr_t *a_bnp; 310 int *a_runp; 311 } */ *ap = v; 312 313 if (!chkvnlock(ap->a_vp)) 314 return (EIO); 315 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 316 } 317 318 /* 319 * Print out the contents of a dead vnode. 320 */ 321 /* ARGSUSED */ 322 int 323 dead_print(void *v) 324 { 325 printf("tag VT_NON, dead vnode\n"); 326 return 0; 327 } 328 329 int 330 dead_getpages(void *v) 331 { 332 struct vop_getpages_args /* { 333 struct vnode *a_vp; 334 voff_t a_offset; 335 struct vm_page **a_m; 336 int *a_count; 337 int a_centeridx; 338 vm_prot_t a_access_type; 339 int a_advice; 340 int a_flags; 341 } */ *ap = v; 342 343 if ((ap->a_flags & PGO_LOCKED) == 0) 344 simple_unlock(&ap->a_vp->v_interlock); 345 346 return (EFAULT); 347 } 348 349 /* 350 * We have to wait during times when the vnode is 351 * in a state of change. 352 */ 353 int 354 chkvnlock(vp) 355 struct vnode *vp; 356 { 357 int locked = 0; 358 359 while (vp->v_flag & VXLOCK) { 360 vp->v_flag |= VXWANT; 361 (void) tsleep(vp, PINOD, "deadchk", 0); 362 locked = 1; 363 } 364 return (locked); 365 } 366
Indexes created Sun Oct 19 16:10:00 GMT 2025