dead_vnops.c revision 1.41
1 /* $NetBSD: dead_vnops.c,v 1.41 2006/11/16 01:33:38 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 1.41 2006/11/16 01:33:38 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(void *v) 165 { 166 167 return (ENXIO); 168 } 169 170 /* 171 * Vnode op for read 172 */ 173 /* ARGSUSED */ 174 int 175 dead_read(v) 176 void *v; 177 { 178 struct vop_read_args /* { 179 struct vnode *a_vp; 180 struct uio *a_uio; 181 int a_ioflag; 182 kauth_cred_t a_cred; 183 } */ *ap = v; 184 185 if (chkvnlock(ap->a_vp)) 186 panic("dead_read: lock"); 187 /* 188 * Return EOF for tty devices, EIO for others 189 */ 190 if ((ap->a_vp->v_flag & VISTTY) == 0) 191 return (EIO); 192 return (0); 193 } 194 195 /* 196 * Vnode op for write 197 */ 198 /* ARGSUSED */ 199 int 200 dead_write(v) 201 void *v; 202 { 203 struct vop_write_args /* { 204 struct vnode *a_vp; 205 struct uio *a_uio; 206 int a_ioflag; 207 kauth_cred_t a_cred; 208 } */ *ap = v; 209 210 if (chkvnlock(ap->a_vp)) 211 panic("dead_write: lock"); 212 return (EIO); 213 } 214 215 /* 216 * Device ioctl operation. 217 */ 218 /* ARGSUSED */ 219 int 220 dead_ioctl(v) 221 void *v; 222 { 223 struct vop_ioctl_args /* { 224 struct vnode *a_vp; 225 u_long a_command; 226 void *a_data; 227 int a_fflag; 228 kauth_cred_t a_cred; 229 struct lwp *a_l; 230 } */ *ap = v; 231 232 if (!chkvnlock(ap->a_vp)) 233 return (EBADF); 234 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 235 } 236 237 /* ARGSUSED */ 238 int 239 dead_poll(v) 240 void *v; 241 { 242 struct vop_poll_args /* { 243 struct vnode *a_vp; 244 int a_events; 245 struct lwp *a_l; 246 } */ *ap = v; 247 248 /* 249 * Let the user find out that the descriptor is gone. 250 */ 251 return (ap->a_events); 252 } 253 254 /* 255 * Just call the device strategy routine 256 */ 257 int 258 dead_strategy(v) 259 void *v; 260 { 261 262 struct vop_strategy_args /* { 263 struct vnode *a_vp; 264 struct buf *a_bp; 265 } */ *ap = v; 266 if (ap->a_vp == NULL || !chkvnlock(ap->a_vp)) { 267 ap->a_bp->b_flags |= B_ERROR; 268 biodone(ap->a_bp); 269 return (EIO); 270 } 271 return (VOP_STRATEGY(ap->a_vp, ap->a_bp)); 272 } 273 274 /* 275 * Wait until the vnode has finished changing state. 276 */ 277 int 278 dead_lock(v) 279 void *v; 280 { 281 struct vop_lock_args /* { 282 struct vnode *a_vp; 283 int a_flags; 284 struct proc *a_p; 285 } */ *ap = v; 286 287 if (ap->a_flags & LK_INTERLOCK) { 288 simple_unlock(&ap->a_vp->v_interlock); 289 ap->a_flags &= ~LK_INTERLOCK; 290 } 291 if (!chkvnlock(ap->a_vp)) 292 return (0); 293 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 294 } 295 296 /* 297 * Wait until the vnode has finished changing state. 298 */ 299 int 300 dead_bmap(v) 301 void *v; 302 { 303 struct vop_bmap_args /* { 304 struct vnode *a_vp; 305 daddr_t a_bn; 306 struct vnode **a_vpp; 307 daddr_t *a_bnp; 308 int *a_runp; 309 } */ *ap = v; 310 311 if (!chkvnlock(ap->a_vp)) 312 return (EIO); 313 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 314 } 315 316 /* 317 * Print out the contents of a dead vnode. 318 */ 319 /* ARGSUSED */ 320 int 321 dead_print(void *v) 322 { 323 printf("tag VT_NON, dead vnode\n"); 324 return 0; 325 } 326 327 /* 328 * We have to wait during times when the vnode is 329 * in a state of change. 330 */ 331 int 332 chkvnlock(vp) 333 struct vnode *vp; 334 { 335 int locked = 0; 336 337 while (vp->v_flag & VXLOCK) { 338 vp->v_flag |= VXWANT; 339 (void) tsleep(vp, PINOD, "deadchk", 0); 340 locked = 1; 341 } 342 return (locked); 343 } 344
Indexes created Tue Sep 23 02:09:52 GMT 2025