1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)dead_vnops.c 7.21 (Berkeley) 05/31/92 8 */ 9 10 #include "param.h" 11 #include "systm.h" 12 #include "time.h" 13 #include "vnode.h" 14 #include "errno.h" 15 #include "namei.h" 16 #include "buf.h" 17 18 /* 19 * Prototypes for dead operations on vnodes. 20 */ 21 int dead_badop(), 22 dead_ebadf(); 23 int dead_lookup __P((struct vop_lookup_args *)); 24 #define dead_create ((int (*) __P((struct vop_create_args *)))dead_badop) 25 #define dead_mknod ((int (*) __P((struct vop_mknod_args *)))dead_badop) 26 int dead_open __P((struct vop_open_args *)); 27 #define dead_close ((int (*) __P((struct vop_close_args *)))nullop) 28 #define dead_access ((int (*) __P((struct vop_access_args *)))dead_ebadf) 29 #define dead_getattr ((int (*) __P((struct vop_getattr_args *)))dead_ebadf) 30 #define dead_setattr ((int (*) __P((struct vop_setattr_args *)))dead_ebadf) 31 int dead_read __P((struct vop_read_args *)); 32 int dead_write __P((struct vop_write_args *)); 33 int dead_ioctl __P((struct vop_ioctl_args *)); 34 int dead_select __P((struct vop_select_args *)); 35 #define dead_mmap ((int (*) __P((struct vop_mmap_args *)))dead_badop) 36 #define dead_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 37 #define dead_seek ((int (*) __P((struct vop_seek_args *)))nullop) 38 #define dead_remove ((int (*) __P((struct vop_remove_args *)))dead_badop) 39 #define dead_link ((int (*) __P((struct vop_link_args *)))dead_badop) 40 #define dead_rename ((int (*) __P((struct vop_rename_args *)))dead_badop) 41 #define dead_mkdir ((int (*) __P((struct vop_mkdir_args *)))dead_badop) 42 #define dead_rmdir ((int (*) __P((struct vop_rmdir_args *)))dead_badop) 43 #define dead_symlink ((int (*) __P((struct vop_symlink_args *)))dead_badop) 44 #define dead_readdir ((int (*) __P((struct vop_readdir_args *)))dead_ebadf) 45 #define dead_readlink ((int (*) __P((struct vop_readlink_args *)))dead_ebadf) 46 #define dead_abortop ((int (*) __P((struct vop_abortop_args *)))dead_badop) 47 #define dead_inactive ((int (*) __P((struct vop_inactive_args *)))nullop) 48 #define dead_reclaim ((int (*) __P((struct vop_reclaim_args *)))nullop) 49 int dead_lock __P((struct vop_lock_args *)); 50 #define dead_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 51 int dead_bmap __P((struct vop_bmap_args *)); 52 int dead_strategy __P((struct vop_strategy_args *)); 53 int dead_print __P((struct vop_print_args *)); 54 #define dead_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 55 #define dead_advlock ((int (*) __P((struct vop_advlock_args *)))dead_ebadf) 56 #define dead_blkatoff ((int (*) __P((struct vop_blkatoff_args *)))dead_badop) 57 #define dead_vget ((int (*) __P((struct vop_vget_args *)))dead_badop) 58 #define dead_valloc ((int (*) __P((struct vop_valloc_args *)))dead_badop) 59 #define dead_vfree ((int (*) __P((struct vop_vfree_args *)))dead_badop) 60 #define dead_truncate ((int (*) __P((struct vop_truncate_args *)))nullop) 61 #define dead_update ((int (*) __P((struct vop_update_args *)))nullop) 62 #define dead_bwrite ((int (*) __P((struct vop_bwrite_args *)))nullop) 63 64 int (**dead_vnodeop_p)(); 65 struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 66 { &vop_default_desc, vn_default_error }, 67 { &vop_lookup_desc, dead_lookup }, /* lookup */ 68 { &vop_create_desc, dead_create }, /* create */ 69 { &vop_mknod_desc, dead_mknod }, /* mknod */ 70 { &vop_open_desc, dead_open }, /* open */ 71 { &vop_close_desc, dead_close }, /* close */ 72 { &vop_access_desc, dead_access }, /* access */ 73 { &vop_getattr_desc, dead_getattr }, /* getattr */ 74 { &vop_setattr_desc, dead_setattr }, /* setattr */ 75 { &vop_read_desc, dead_read }, /* read */ 76 { &vop_write_desc, dead_write }, /* write */ 77 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 78 { &vop_select_desc, dead_select }, /* select */ 79 { &vop_mmap_desc, dead_mmap }, /* mmap */ 80 { &vop_fsync_desc, dead_fsync }, /* fsync */ 81 { &vop_seek_desc, dead_seek }, /* seek */ 82 { &vop_remove_desc, dead_remove }, /* remove */ 83 { &vop_link_desc, dead_link }, /* link */ 84 { &vop_rename_desc, dead_rename }, /* rename */ 85 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 86 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 87 { &vop_symlink_desc, dead_symlink }, /* symlink */ 88 { &vop_readdir_desc, dead_readdir }, /* readdir */ 89 { &vop_readlink_desc, dead_readlink }, /* readlink */ 90 { &vop_abortop_desc, dead_abortop }, /* abortop */ 91 { &vop_inactive_desc, dead_inactive }, /* inactive */ 92 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 93 { &vop_lock_desc, dead_lock }, /* lock */ 94 { &vop_unlock_desc, dead_unlock }, /* unlock */ 95 { &vop_bmap_desc, dead_bmap }, /* bmap */ 96 { &vop_strategy_desc, dead_strategy }, /* strategy */ 97 { &vop_print_desc, dead_print }, /* print */ 98 { &vop_islocked_desc, dead_islocked }, /* islocked */ 99 { &vop_advlock_desc, dead_advlock }, /* advlock */ 100 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 101 { &vop_vget_desc, dead_vget }, /* vget */ 102 { &vop_valloc_desc, dead_valloc }, /* valloc */ 103 { &vop_vfree_desc, dead_vfree }, /* vfree */ 104 { &vop_truncate_desc, dead_truncate }, /* truncate */ 105 { &vop_update_desc, dead_update }, /* update */ 106 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 107 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 108 }; 109 struct vnodeopv_desc dead_vnodeop_opv_desc = 110 { &dead_vnodeop_p, dead_vnodeop_entries }; 111 112 /* 113 * Trivial lookup routine that always fails. 114 */ 115 /* ARGSUSED */ 116 int 117 dead_lookup (ap) 118 struct vop_lookup_args *ap; 119 { 120 121 *ap->a_vpp = NULL; 122 return (ENOTDIR); 123 } 124 125 /* 126 * Open always fails as if device did not exist. 127 */ 128 /* ARGSUSED */ 129 dead_open (ap) 130 struct vop_open_args *ap; 131 { 132 133 return (ENXIO); 134 } 135 136 /* 137 * Vnode op for read 138 */ 139 /* ARGSUSED */ 140 dead_read (ap) 141 struct vop_read_args *ap; 142 { 143 144 if (chkvnlock(ap->a_vp)) 145 panic("dead_read: lock"); 146 /* 147 * Return EOF for character devices, EIO for others 148 */ 149 if (ap->a_vp->v_type != VCHR) 150 return (EIO); 151 return (0); 152 } 153 154 /* 155 * Vnode op for write 156 */ 157 /* ARGSUSED */ 158 dead_write (ap) 159 struct vop_write_args *ap; 160 { 161 162 if (chkvnlock(ap->a_vp)) 163 panic("dead_write: lock"); 164 return (EIO); 165 } 166 167 /* 168 * Device ioctl operation. 169 */ 170 /* ARGSUSED */ 171 dead_ioctl (ap) 172 struct vop_ioctl_args *ap; 173 { 174 USES_VOP_IOCTL; 175 176 if (!chkvnlock(ap->a_vp)) 177 return (EBADF); 178 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 179 } 180 181 /* ARGSUSED */ 182 dead_select (ap) 183 struct vop_select_args *ap; 184 { 185 186 /* 187 * Let the user find out that the descriptor is gone. 188 */ 189 return (1); 190 } 191 192 /* 193 * Just call the device strategy routine 194 */ 195 dead_strategy (ap) 196 struct vop_strategy_args *ap; 197 { 198 USES_VOP_STRATEGY; 199 200 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 201 ap->a_bp->b_flags |= B_ERROR; 202 biodone(ap->a_bp); 203 return (EIO); 204 } 205 return (VOP_STRATEGY(ap->a_bp)); 206 } 207 208 /* 209 * Wait until the vnode has finished changing state. 210 */ 211 dead_lock (ap) 212 struct vop_lock_args *ap; 213 { 214 USES_VOP_LOCK; 215 216 if (!chkvnlock(ap->a_vp)) 217 return (0); 218 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 219 } 220 221 /* 222 * Wait until the vnode has finished changing state. 223 */ 224 dead_bmap (ap) 225 struct vop_bmap_args *ap; 226 { 227 USES_VOP_BMAP; 228 229 if (!chkvnlock(ap->a_vp)) 230 return (EIO); 231 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp)); 232 } 233 234 /* 235 * Print out the contents of a dead vnode. 236 */ 237 /* ARGSUSED */ 238 dead_print (ap) 239 struct vop_print_args *ap; 240 { 241 242 printf("tag VT_NON, dead vnode\n"); 243 } 244 245 /* 246 * Empty vnode failed operation 247 */ 248 dead_ebadf() 249 { 250 251 return (EBADF); 252 } 253 254 /* 255 * Empty vnode bad operation 256 */ 257 dead_badop() 258 { 259 260 panic("dead_badop called"); 261 /* NOTREACHED */ 262 } 263 264 /* 265 * Empty vnode null operation 266 */ 267 dead_nullop() 268 { 269 270 return (0); 271 } 272 273 /* 274 * We have to wait during times when the vnode is 275 * in a state of change. 276 */ 277 chkvnlock(vp) 278 register struct vnode *vp; 279 { 280 int locked = 0; 281 282 while (vp->v_flag & VXLOCK) { 283 vp->v_flag |= VXWANT; 284 sleep((caddr_t)vp, PINOD); 285 locked = 1; 286 } 287 return (locked); 288 } 289