dead_vnops.c revision 1.38
1 /* $NetBSD: dead_vnops.c,v 1.38 2005/12/11 12:24:50 christos 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 1.38 2005/12/11 12:24:50 christos 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 #define dead_putpages genfs_null_putpages 90 91 int chkvnlock(struct vnode *); 92 93 int (**dead_vnodeop_p)(void *); 94 95 const struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 96 { &vop_default_desc, vn_default_error }, 97 { &vop_lookup_desc, dead_lookup }, /* lookup */ 98 { &vop_create_desc, dead_create }, /* create */ 99 { &vop_mknod_desc, dead_mknod }, /* mknod */ 100 { &vop_open_desc, dead_open }, /* open */ 101 { &vop_close_desc, dead_close }, /* close */ 102 { &vop_access_desc, dead_access }, /* access */ 103 { &vop_getattr_desc, dead_getattr }, /* getattr */ 104 { &vop_setattr_desc, dead_setattr }, /* setattr */ 105 { &vop_read_desc, dead_read }, /* read */ 106 { &vop_write_desc, dead_write }, /* write */ 107 { &vop_lease_desc, dead_lease_check }, /* lease */ 108 { &vop_fcntl_desc, dead_fcntl }, /* fcntl */ 109 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 110 { &vop_poll_desc, dead_poll }, /* poll */ 111 { &vop_revoke_desc, dead_revoke }, /* revoke */ 112 { &vop_mmap_desc, dead_mmap }, /* mmap */ 113 { &vop_fsync_desc, dead_fsync }, /* fsync */ 114 { &vop_seek_desc, dead_seek }, /* seek */ 115 { &vop_remove_desc, dead_remove }, /* remove */ 116 { &vop_link_desc, dead_link }, /* link */ 117 { &vop_rename_desc, dead_rename }, /* rename */ 118 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 119 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 120 { &vop_symlink_desc, dead_symlink }, /* symlink */ 121 { &vop_readdir_desc, dead_readdir }, /* readdir */ 122 { &vop_readlink_desc, dead_readlink }, /* readlink */ 123 { &vop_abortop_desc, dead_abortop }, /* abortop */ 124 { &vop_inactive_desc, dead_inactive }, /* inactive */ 125 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 126 { &vop_lock_desc, dead_lock }, /* lock */ 127 { &vop_unlock_desc, dead_unlock }, /* unlock */ 128 { &vop_bmap_desc, dead_bmap }, /* bmap */ 129 { &vop_strategy_desc, dead_strategy }, /* strategy */ 130 { &vop_print_desc, dead_print }, /* print */ 131 { &vop_islocked_desc, dead_islocked }, /* islocked */ 132 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 133 { &vop_advlock_desc, dead_advlock }, /* advlock */ 134 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 135 { &vop_putpages_desc, dead_putpages }, /* putpages */ 136 { NULL, NULL } 137 }; 138 const struct vnodeopv_desc dead_vnodeop_opv_desc = 139 { &dead_vnodeop_p, dead_vnodeop_entries }; 140 141 /* 142 * Trivial lookup routine that always fails. 143 */ 144 /* ARGSUSED */ 145 int 146 dead_lookup(v) 147 void *v; 148 { 149 struct vop_lookup_args /* { 150 struct vnode * a_dvp; 151 struct vnode ** a_vpp; 152 struct componentname * a_cnp; 153 } */ *ap = v; 154 155 *ap->a_vpp = NULL; 156 return (ENOTDIR); 157 } 158 159 /* 160 * Open always fails as if device did not exist. 161 */ 162 /* ARGSUSED */ 163 int 164 dead_open(v) 165 void *v; 166 { 167 168 return (ENXIO); 169 } 170 171 /* 172 * Vnode op for read 173 */ 174 /* ARGSUSED */ 175 int 176 dead_read(v) 177 void *v; 178 { 179 struct vop_read_args /* { 180 struct vnode *a_vp; 181 struct uio *a_uio; 182 int a_ioflag; 183 struct ucred *a_cred; 184 } */ *ap = v; 185 186 if (chkvnlock(ap->a_vp)) 187 panic("dead_read: lock"); 188 /* 189 * Return EOF for tty devices, EIO for others 190 */ 191 if ((ap->a_vp->v_flag & VISTTY) == 0) 192 return (EIO); 193 return (0); 194 } 195 196 /* 197 * Vnode op for write 198 */ 199 /* ARGSUSED */ 200 int 201 dead_write(v) 202 void *v; 203 { 204 struct vop_write_args /* { 205 struct vnode *a_vp; 206 struct uio *a_uio; 207 int a_ioflag; 208 struct ucred *a_cred; 209 } */ *ap = v; 210 211 if (chkvnlock(ap->a_vp)) 212 panic("dead_write: lock"); 213 return (EIO); 214 } 215 216 /* 217 * Device ioctl operation. 218 */ 219 /* ARGSUSED */ 220 int 221 dead_ioctl(v) 222 void *v; 223 { 224 struct vop_ioctl_args /* { 225 struct vnode *a_vp; 226 u_long a_command; 227 void *a_data; 228 int a_fflag; 229 struct ucred *a_cred; 230 struct lwp *a_l; 231 } */ *ap = v; 232 233 if (!chkvnlock(ap->a_vp)) 234 return (EBADF); 235 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 236 } 237 238 /* ARGSUSED */ 239 int 240 dead_poll(v) 241 void *v; 242 { 243 struct vop_poll_args /* { 244 struct vnode *a_vp; 245 int a_events; 246 struct lwp *a_l; 247 } */ *ap = v; 248 249 /* 250 * Let the user find out that the descriptor is gone. 251 */ 252 return (ap->a_events); 253 } 254 255 /* 256 * Just call the device strategy routine 257 */ 258 int 259 dead_strategy(v) 260 void *v; 261 { 262 263 struct vop_strategy_args /* { 264 struct vnode *a_vp; 265 struct buf *a_bp; 266 } */ *ap = v; 267 if (ap->a_vp == NULL || !chkvnlock(ap->a_vp)) { 268 ap->a_bp->b_flags |= B_ERROR; 269 biodone(ap->a_bp); 270 return (EIO); 271 } 272 return (VOP_STRATEGY(ap->a_vp, ap->a_bp)); 273 } 274 275 /* 276 * Wait until the vnode has finished changing state. 277 */ 278 int 279 dead_lock(v) 280 void *v; 281 { 282 struct vop_lock_args /* { 283 struct vnode *a_vp; 284 int a_flags; 285 struct proc *a_p; 286 } */ *ap = v; 287 288 if (ap->a_flags & LK_INTERLOCK) { 289 simple_unlock(&ap->a_vp->v_interlock); 290 ap->a_flags &= ~LK_INTERLOCK; 291 } 292 if (!chkvnlock(ap->a_vp)) 293 return (0); 294 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 295 } 296 297 /* 298 * Wait until the vnode has finished changing state. 299 */ 300 int 301 dead_bmap(v) 302 void *v; 303 { 304 struct vop_bmap_args /* { 305 struct vnode *a_vp; 306 daddr_t a_bn; 307 struct vnode **a_vpp; 308 daddr_t *a_bnp; 309 int *a_runp; 310 } */ *ap = v; 311 312 if (!chkvnlock(ap->a_vp)) 313 return (EIO); 314 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 315 } 316 317 /* 318 * Print out the contents of a dead vnode. 319 */ 320 /* ARGSUSED */ 321 int 322 dead_print(v) 323 void *v; 324 { 325 printf("tag VT_NON, dead vnode\n"); 326 return 0; 327 } 328 329 /* 330 * We have to wait during times when the vnode is 331 * in a state of change. 332 */ 333 int 334 chkvnlock(vp) 335 struct vnode *vp; 336 { 337 int locked = 0; 338 339 while (vp->v_flag & VXLOCK) { 340 vp->v_flag |= VXWANT; 341 (void) tsleep(vp, PINOD, "deadchk", 0); 342 locked = 1; 343 } 344 return (locked); 345 } 346
Indexes created Fri Sep 26 08:10:20 GMT 2025