union_vnops.c revision 1.21.10.2
1 1.21.10.2 pooka /* $NetBSD: union_vnops.c,v 1.21.10.2 2007/07/29 13:12:43 pooka Exp $ */ 2 1.21.10.2 pooka 3 1.21.10.2 pooka /* 4 1.21.10.2 pooka * Copyright (c) 1992, 1993, 1994, 1995 5 1.21.10.2 pooka * The Regents of the University of California. All rights reserved. 6 1.21.10.2 pooka * 7 1.21.10.2 pooka * This code is derived from software contributed to Berkeley by 8 1.21.10.2 pooka * Jan-Simon Pendry. 9 1.21.10.2 pooka * 10 1.21.10.2 pooka * Redistribution and use in source and binary forms, with or without 11 1.21.10.2 pooka * modification, are permitted provided that the following conditions 12 1.21.10.2 pooka * are met: 13 1.21.10.2 pooka * 1. Redistributions of source code must retain the above copyright 14 1.21.10.2 pooka * notice, this list of conditions and the following disclaimer. 15 1.21.10.2 pooka * 2. Redistributions in binary form must reproduce the above copyright 16 1.21.10.2 pooka * notice, this list of conditions and the following disclaimer in the 17 1.21.10.2 pooka * documentation and/or other materials provided with the distribution. 18 1.21.10.2 pooka * 3. Neither the name of the University nor the names of its contributors 19 1.21.10.2 pooka * may be used to endorse or promote products derived from this software 20 1.21.10.2 pooka * without specific prior written permission. 21 1.21.10.2 pooka * 22 1.21.10.2 pooka * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.21.10.2 pooka * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.21.10.2 pooka * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.21.10.2 pooka * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.21.10.2 pooka * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.21.10.2 pooka * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.21.10.2 pooka * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.21.10.2 pooka * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.21.10.2 pooka * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.21.10.2 pooka * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.21.10.2 pooka * SUCH DAMAGE. 33 1.21.10.2 pooka * 34 1.21.10.2 pooka * @(#)union_vnops.c 8.33 (Berkeley) 7/31/95 35 1.21.10.2 pooka */ 36 1.21.10.2 pooka 37 1.21.10.2 pooka /* 38 1.21.10.2 pooka * Copyright (c) 1992, 1993, 1994, 1995 Jan-Simon Pendry. 39 1.21.10.2 pooka * 40 1.21.10.2 pooka * This code is derived from software contributed to Berkeley by 41 1.21.10.2 pooka * Jan-Simon Pendry. 42 1.21.10.2 pooka * 43 1.21.10.2 pooka * Redistribution and use in source and binary forms, with or without 44 1.21.10.2 pooka * modification, are permitted provided that the following conditions 45 1.21.10.2 pooka * are met: 46 1.21.10.2 pooka * 1. Redistributions of source code must retain the above copyright 47 1.21.10.2 pooka * notice, this list of conditions and the following disclaimer. 48 1.21.10.2 pooka * 2. Redistributions in binary form must reproduce the above copyright 49 1.21.10.2 pooka * notice, this list of conditions and the following disclaimer in the 50 1.21.10.2 pooka * documentation and/or other materials provided with the distribution. 51 1.21.10.2 pooka * 3. All advertising materials mentioning features or use of this software 52 1.21.10.2 pooka * must display the following acknowledgement: 53 1.21.10.2 pooka * This product includes software developed by the University of 54 1.21.10.2 pooka * California, Berkeley and its contributors. 55 1.21.10.2 pooka * 4. Neither the name of the University nor the names of its contributors 56 1.21.10.2 pooka * may be used to endorse or promote products derived from this software 57 1.21.10.2 pooka * without specific prior written permission. 58 1.21.10.2 pooka * 59 1.21.10.2 pooka * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 1.21.10.2 pooka * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 1.21.10.2 pooka * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 1.21.10.2 pooka * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 1.21.10.2 pooka * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 1.21.10.2 pooka * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 1.21.10.2 pooka * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 1.21.10.2 pooka * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 1.21.10.2 pooka * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 1.21.10.2 pooka * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 1.21.10.2 pooka * SUCH DAMAGE. 70 1.21.10.2 pooka * 71 1.21.10.2 pooka * @(#)union_vnops.c 8.33 (Berkeley) 7/31/95 72 1.21.10.2 pooka */ 73 1.21.10.2 pooka 74 1.21.10.2 pooka #include <sys/cdefs.h> 75 1.21.10.2 pooka __KERNEL_RCSID(0, "$NetBSD: union_vnops.c,v 1.21.10.2 2007/07/29 13:12:43 pooka Exp $"); 76 1.21.10.2 pooka 77 1.21.10.2 pooka #include <sys/param.h> 78 1.21.10.2 pooka #include <sys/systm.h> 79 1.21.10.2 pooka #include <sys/proc.h> 80 1.21.10.2 pooka #include <sys/file.h> 81 1.21.10.2 pooka #include <sys/time.h> 82 1.21.10.2 pooka #include <sys/stat.h> 83 1.21.10.2 pooka #include <sys/vnode.h> 84 1.21.10.2 pooka #include <sys/mount.h> 85 1.21.10.2 pooka #include <sys/namei.h> 86 1.21.10.2 pooka #include <sys/malloc.h> 87 1.21.10.2 pooka #include <sys/buf.h> 88 1.21.10.2 pooka #include <sys/queue.h> 89 1.21.10.2 pooka #include <sys/lock.h> 90 1.21.10.2 pooka #include <sys/kauth.h> 91 1.21.10.2 pooka 92 1.21.10.2 pooka #include <fs/union/union.h> 93 1.21.10.2 pooka #include <miscfs/genfs/genfs.h> 94 1.21.10.2 pooka 95 1.21.10.2 pooka int union_lookup(void *); 96 1.21.10.2 pooka int union_create(void *); 97 1.21.10.2 pooka int union_whiteout(void *); 98 1.21.10.2 pooka int union_mknod(void *); 99 1.21.10.2 pooka int union_open(void *); 100 1.21.10.2 pooka int union_close(void *); 101 1.21.10.2 pooka int union_access(void *); 102 1.21.10.2 pooka int union_getattr(void *); 103 1.21.10.2 pooka int union_setattr(void *); 104 1.21.10.2 pooka int union_read(void *); 105 1.21.10.2 pooka int union_write(void *); 106 1.21.10.2 pooka int union_lease(void *); 107 1.21.10.2 pooka int union_ioctl(void *); 108 1.21.10.2 pooka int union_poll(void *); 109 1.21.10.2 pooka int union_revoke(void *); 110 1.21.10.2 pooka int union_mmap(void *); 111 1.21.10.2 pooka int union_fsync(void *); 112 1.21.10.2 pooka int union_seek(void *); 113 1.21.10.2 pooka int union_remove(void *); 114 1.21.10.2 pooka int union_link(void *); 115 1.21.10.2 pooka int union_rename(void *); 116 1.21.10.2 pooka int union_mkdir(void *); 117 1.21.10.2 pooka int union_rmdir(void *); 118 1.21.10.2 pooka int union_symlink(void *); 119 1.21.10.2 pooka int union_readdir(void *); 120 1.21.10.2 pooka int union_readlink(void *); 121 1.21.10.2 pooka int union_abortop(void *); 122 1.21.10.2 pooka int union_inactive(void *); 123 1.21.10.2 pooka int union_reclaim(void *); 124 1.21.10.2 pooka int union_lock(void *); 125 1.21.10.2 pooka int union_unlock(void *); 126 1.21.10.2 pooka int union_bmap(void *); 127 1.21.10.2 pooka int union_print(void *); 128 1.21.10.2 pooka int union_islocked(void *); 129 1.21.10.2 pooka int union_pathconf(void *); 130 1.21.10.2 pooka int union_advlock(void *); 131 1.21.10.2 pooka int union_strategy(void *); 132 1.21.10.2 pooka int union_getpages(void *); 133 1.21.10.2 pooka int union_putpages(void *); 134 1.21.10.2 pooka int union_kqfilter(void *); 135 1.21.10.2 pooka 136 1.21.10.2 pooka static void union_fixup(struct union_node *); 137 1.21.10.2 pooka static int union_lookup1(struct vnode *, struct vnode **, 138 1.21.10.2 pooka struct vnode **, struct componentname *); 139 1.21.10.2 pooka 140 1.21.10.2 pooka 141 1.21.10.2 pooka /* 142 1.21.10.2 pooka * Global vfs data structures 143 1.21.10.2 pooka */ 144 1.21.10.2 pooka int (**union_vnodeop_p)(void *); 145 1.21.10.2 pooka const struct vnodeopv_entry_desc union_vnodeop_entries[] = { 146 1.21.10.2 pooka { &vop_default_desc, vn_default_error }, 147 1.21.10.2 pooka { &vop_lookup_desc, union_lookup }, /* lookup */ 148 1.21.10.2 pooka { &vop_create_desc, union_create }, /* create */ 149 1.21.10.2 pooka { &vop_whiteout_desc, union_whiteout }, /* whiteout */ 150 1.21.10.2 pooka { &vop_mknod_desc, union_mknod }, /* mknod */ 151 1.21.10.2 pooka { &vop_open_desc, union_open }, /* open */ 152 1.21.10.2 pooka { &vop_close_desc, union_close }, /* close */ 153 1.21.10.2 pooka { &vop_access_desc, union_access }, /* access */ 154 1.21.10.2 pooka { &vop_getattr_desc, union_getattr }, /* getattr */ 155 1.21.10.2 pooka { &vop_setattr_desc, union_setattr }, /* setattr */ 156 1.21.10.2 pooka { &vop_read_desc, union_read }, /* read */ 157 1.21.10.2 pooka { &vop_write_desc, union_write }, /* write */ 158 1.21.10.2 pooka { &vop_lease_desc, union_lease }, /* lease */ 159 1.21.10.2 pooka { &vop_ioctl_desc, union_ioctl }, /* ioctl */ 160 1.21.10.2 pooka { &vop_poll_desc, union_poll }, /* select */ 161 1.21.10.2 pooka { &vop_revoke_desc, union_revoke }, /* revoke */ 162 1.21.10.2 pooka { &vop_mmap_desc, union_mmap }, /* mmap */ 163 1.21.10.2 pooka { &vop_fsync_desc, union_fsync }, /* fsync */ 164 1.21.10.2 pooka { &vop_seek_desc, union_seek }, /* seek */ 165 1.21.10.2 pooka { &vop_remove_desc, union_remove }, /* remove */ 166 1.21.10.2 pooka { &vop_link_desc, union_link }, /* link */ 167 1.21.10.2 pooka { &vop_rename_desc, union_rename }, /* rename */ 168 1.21.10.2 pooka { &vop_mkdir_desc, union_mkdir }, /* mkdir */ 169 1.21.10.2 pooka { &vop_rmdir_desc, union_rmdir }, /* rmdir */ 170 1.21.10.2 pooka { &vop_symlink_desc, union_symlink }, /* symlink */ 171 1.21.10.2 pooka { &vop_readdir_desc, union_readdir }, /* readdir */ 172 1.21.10.2 pooka { &vop_readlink_desc, union_readlink }, /* readlink */ 173 1.21.10.2 pooka { &vop_abortop_desc, union_abortop }, /* abortop */ 174 1.21.10.2 pooka { &vop_inactive_desc, union_inactive }, /* inactive */ 175 1.21.10.2 pooka { &vop_reclaim_desc, union_reclaim }, /* reclaim */ 176 1.21.10.2 pooka { &vop_lock_desc, union_lock }, /* lock */ 177 1.21.10.2 pooka { &vop_unlock_desc, union_unlock }, /* unlock */ 178 1.21.10.2 pooka { &vop_bmap_desc, union_bmap }, /* bmap */ 179 1.21.10.2 pooka { &vop_strategy_desc, union_strategy }, /* strategy */ 180 1.21.10.2 pooka { &vop_print_desc, union_print }, /* print */ 181 1.21.10.2 pooka { &vop_islocked_desc, union_islocked }, /* islocked */ 182 1.21.10.2 pooka { &vop_pathconf_desc, union_pathconf }, /* pathconf */ 183 1.21.10.2 pooka { &vop_advlock_desc, union_advlock }, /* advlock */ 184 1.21.10.2 pooka { &vop_getpages_desc, union_getpages }, /* getpages */ 185 1.21.10.2 pooka { &vop_putpages_desc, union_putpages }, /* putpages */ 186 1.21.10.2 pooka { &vop_kqfilter_desc, union_kqfilter }, /* kqfilter */ 187 1.21.10.2 pooka #ifdef notdef 188 1.21.10.2 pooka { &vop_bwrite_desc, union_bwrite }, /* bwrite */ 189 1.21.10.2 pooka #endif 190 1.21.10.2 pooka { NULL, NULL } 191 1.21.10.2 pooka }; 192 1.21.10.2 pooka const struct vnodeopv_desc union_vnodeop_opv_desc = 193 1.21.10.2 pooka { &union_vnodeop_p, union_vnodeop_entries }; 194 1.21.10.2 pooka 195 1.21.10.2 pooka #define FIXUP(un) { \ 196 1.21.10.2 pooka if (((un)->un_flags & UN_ULOCK) == 0) { \ 197 1.21.10.2 pooka union_fixup(un); \ 198 1.21.10.2 pooka } \ 199 1.21.10.2 pooka } 200 1.21.10.2 pooka 201 1.21.10.2 pooka static void 202 1.21.10.2 pooka union_fixup(un) 203 1.21.10.2 pooka struct union_node *un; 204 1.21.10.2 pooka { 205 1.21.10.2 pooka 206 1.21.10.2 pooka vn_lock(un->un_uppervp, LK_EXCLUSIVE | LK_RETRY); 207 1.21.10.2 pooka un->un_flags |= UN_ULOCK; 208 1.21.10.2 pooka } 209 1.21.10.2 pooka 210 1.21.10.2 pooka static int 211 1.21.10.2 pooka union_lookup1(udvp, dvpp, vpp, cnp) 212 1.21.10.2 pooka struct vnode *udvp; 213 1.21.10.2 pooka struct vnode **dvpp; 214 1.21.10.2 pooka struct vnode **vpp; 215 1.21.10.2 pooka struct componentname *cnp; 216 1.21.10.2 pooka { 217 1.21.10.2 pooka int error; 218 1.21.10.2 pooka struct vnode *tdvp; 219 1.21.10.2 pooka struct vnode *dvp; 220 1.21.10.2 pooka struct mount *mp; 221 1.21.10.2 pooka 222 1.21.10.2 pooka dvp = *dvpp; 223 1.21.10.2 pooka 224 1.21.10.2 pooka /* 225 1.21.10.2 pooka * If stepping up the directory tree, check for going 226 1.21.10.2 pooka * back across the mount point, in which case do what 227 1.21.10.2 pooka * lookup would do by stepping back down the mount 228 1.21.10.2 pooka * hierarchy. 229 1.21.10.2 pooka */ 230 1.21.10.2 pooka if (cnp->cn_flags & ISDOTDOT) { 231 1.21.10.2 pooka while ((dvp != udvp) && (dvp->v_flag & VROOT)) { 232 1.21.10.2 pooka /* 233 1.21.10.2 pooka * Don't do the NOCROSSMOUNT check 234 1.21.10.2 pooka * at this level. By definition, 235 1.21.10.2 pooka * union fs deals with namespaces, not 236 1.21.10.2 pooka * filesystems. 237 1.21.10.2 pooka */ 238 1.21.10.2 pooka tdvp = dvp; 239 1.21.10.2 pooka *dvpp = dvp = dvp->v_mount->mnt_vnodecovered; 240 1.21.10.2 pooka VOP_UNLOCK(tdvp, 0); 241 1.21.10.2 pooka vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 242 1.21.10.2 pooka } 243 1.21.10.2 pooka } 244 1.21.10.2 pooka 245 1.21.10.2 pooka error = VOP_LOOKUP(dvp, &tdvp, cnp); 246 1.21.10.2 pooka if (error) 247 1.21.10.2 pooka return (error); 248 1.21.10.2 pooka 249 1.21.10.2 pooka dvp = tdvp; 250 1.21.10.2 pooka 251 1.21.10.2 pooka /* 252 1.21.10.2 pooka * Lastly check if the current node is a mount point in 253 1.21.10.2 pooka * which case walk up the mount hierarchy making sure not to 254 1.21.10.2 pooka * bump into the root of the mount tree (ie. dvp != udvp). 255 1.21.10.2 pooka */ 256 1.21.10.2 pooka while (dvp != udvp && (dvp->v_type == VDIR) && 257 1.21.10.2 pooka (mp = dvp->v_mountedhere)) { 258 1.21.10.2 pooka 259 1.21.10.2 pooka if (vfs_busy(mp, 0, 0)) 260 1.21.10.2 pooka continue; 261 1.21.10.2 pooka 262 1.21.10.2 pooka vput(dvp); 263 1.21.10.2 pooka error = VFS_ROOT(mp, &tdvp); 264 1.21.10.2 pooka vfs_unbusy(mp); 265 1.21.10.2 pooka if (error) { 266 1.21.10.2 pooka return (error); 267 1.21.10.2 pooka } 268 1.21.10.2 pooka dvp = tdvp; 269 1.21.10.2 pooka } 270 1.21.10.2 pooka 271 1.21.10.2 pooka *vpp = dvp; 272 1.21.10.2 pooka return (0); 273 1.21.10.2 pooka } 274 1.21.10.2 pooka 275 1.21.10.2 pooka int 276 1.21.10.2 pooka union_lookup(v) 277 1.21.10.2 pooka void *v; 278 1.21.10.2 pooka { 279 1.21.10.2 pooka struct vop_lookup_args /* { 280 1.21.10.2 pooka struct vnodeop_desc *a_desc; 281 1.21.10.2 pooka struct vnode *a_dvp; 282 1.21.10.2 pooka struct vnode **a_vpp; 283 1.21.10.2 pooka struct componentname *a_cnp; 284 1.21.10.2 pooka } */ *ap = v; 285 1.21.10.2 pooka int error; 286 1.21.10.2 pooka int uerror, lerror; 287 1.21.10.2 pooka struct vnode *uppervp, *lowervp; 288 1.21.10.2 pooka struct vnode *upperdvp, *lowerdvp; 289 1.21.10.2 pooka struct vnode *dvp = ap->a_dvp; 290 1.21.10.2 pooka struct union_node *dun = VTOUNION(dvp); 291 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 292 1.21.10.2 pooka struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount); 293 1.21.10.2 pooka kauth_cred_t saved_cred = NULL; 294 1.21.10.2 pooka int iswhiteout; 295 1.21.10.2 pooka struct vattr va; 296 1.21.10.2 pooka 297 1.21.10.2 pooka #ifdef notyet 298 1.21.10.2 pooka if (cnp->cn_namelen == 3 && 299 1.21.10.2 pooka cnp->cn_nameptr[2] == '.' && 300 1.21.10.2 pooka cnp->cn_nameptr[1] == '.' && 301 1.21.10.2 pooka cnp->cn_nameptr[0] == '.') { 302 1.21.10.2 pooka dvp = *ap->a_vpp = LOWERVP(ap->a_dvp); 303 1.21.10.2 pooka if (dvp == NULLVP) 304 1.21.10.2 pooka return (ENOENT); 305 1.21.10.2 pooka VREF(dvp); 306 1.21.10.2 pooka vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 307 1.21.10.2 pooka return (0); 308 1.21.10.2 pooka } 309 1.21.10.2 pooka #endif 310 1.21.10.2 pooka 311 1.21.10.2 pooka if ((cnp->cn_flags & ISLASTCN) && 312 1.21.10.2 pooka (dvp->v_mount->mnt_flag & MNT_RDONLY) && 313 1.21.10.2 pooka (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 314 1.21.10.2 pooka return (EROFS); 315 1.21.10.2 pooka 316 1.21.10.2 pooka upperdvp = dun->un_uppervp; 317 1.21.10.2 pooka lowerdvp = dun->un_lowervp; 318 1.21.10.2 pooka uppervp = NULLVP; 319 1.21.10.2 pooka lowervp = NULLVP; 320 1.21.10.2 pooka iswhiteout = 0; 321 1.21.10.2 pooka 322 1.21.10.2 pooka /* 323 1.21.10.2 pooka * do the lookup in the upper level. 324 1.21.10.2 pooka * if that level comsumes additional pathnames, 325 1.21.10.2 pooka * then assume that something special is going 326 1.21.10.2 pooka * on and just return that vnode. 327 1.21.10.2 pooka */ 328 1.21.10.2 pooka if (upperdvp != NULLVP) { 329 1.21.10.2 pooka FIXUP(dun); 330 1.21.10.2 pooka /* 331 1.21.10.2 pooka * If we're doing `..' in the underlying filesystem, 332 1.21.10.2 pooka * we must drop our lock on the union node before 333 1.21.10.2 pooka * going up the tree in the lower file system--if we block 334 1.21.10.2 pooka * on the lowervp lock, and that's held by someone else 335 1.21.10.2 pooka * coming down the tree and who's waiting for our lock, 336 1.21.10.2 pooka * we would be hosed. 337 1.21.10.2 pooka */ 338 1.21.10.2 pooka if (cnp->cn_flags & ISDOTDOT) { 339 1.21.10.2 pooka /* retain lock on underlying VP */ 340 1.21.10.2 pooka dun->un_flags |= UN_KLOCK; 341 1.21.10.2 pooka VOP_UNLOCK(dvp, 0); 342 1.21.10.2 pooka } 343 1.21.10.2 pooka uerror = union_lookup1(um->um_uppervp, &upperdvp, 344 1.21.10.2 pooka &uppervp, cnp); 345 1.21.10.2 pooka 346 1.21.10.2 pooka if (cnp->cn_flags & ISDOTDOT) { 347 1.21.10.2 pooka if (dun->un_uppervp == upperdvp) { 348 1.21.10.2 pooka /* 349 1.21.10.2 pooka * we got the underlying bugger back locked... 350 1.21.10.2 pooka * now take back the union node lock. Since we 351 1.21.10.2 pooka * hold the uppervp lock, we can diddle union 352 1.21.10.2 pooka * locking flags at will. :) 353 1.21.10.2 pooka */ 354 1.21.10.2 pooka dun->un_flags |= UN_ULOCK; 355 1.21.10.2 pooka } 356 1.21.10.2 pooka /* 357 1.21.10.2 pooka * if upperdvp got swapped out, it means we did 358 1.21.10.2 pooka * some mount point magic, and we do not have 359 1.21.10.2 pooka * dun->un_uppervp locked currently--so we get it 360 1.21.10.2 pooka * locked here (don't set the UN_ULOCK flag). 361 1.21.10.2 pooka */ 362 1.21.10.2 pooka vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 363 1.21.10.2 pooka } 364 1.21.10.2 pooka if (cnp->cn_consume != 0) { 365 1.21.10.2 pooka *ap->a_vpp = uppervp; 366 1.21.10.2 pooka return (uerror); 367 1.21.10.2 pooka } 368 1.21.10.2 pooka if (uerror == ENOENT || uerror == EJUSTRETURN) { 369 1.21.10.2 pooka if (cnp->cn_flags & ISWHITEOUT) { 370 1.21.10.2 pooka iswhiteout = 1; 371 1.21.10.2 pooka } else if (lowerdvp != NULLVP) { 372 1.21.10.2 pooka lerror = VOP_GETATTR(upperdvp, &va, 373 1.21.10.2 pooka cnp->cn_cred, cnp->cn_lwp); 374 1.21.10.2 pooka if (lerror == 0 && (va.va_flags & OPAQUE)) 375 1.21.10.2 pooka iswhiteout = 1; 376 1.21.10.2 pooka } 377 1.21.10.2 pooka } 378 1.21.10.2 pooka } else { 379 1.21.10.2 pooka uerror = ENOENT; 380 1.21.10.2 pooka } 381 1.21.10.2 pooka 382 1.21.10.2 pooka /* 383 1.21.10.2 pooka * in a similar way to the upper layer, do the lookup 384 1.21.10.2 pooka * in the lower layer. this time, if there is some 385 1.21.10.2 pooka * component magic going on, then vput whatever we got 386 1.21.10.2 pooka * back from the upper layer and return the lower vnode 387 1.21.10.2 pooka * instead. 388 1.21.10.2 pooka */ 389 1.21.10.2 pooka if (lowerdvp != NULLVP && !iswhiteout) { 390 1.21.10.2 pooka int nameiop; 391 1.21.10.2 pooka 392 1.21.10.2 pooka vn_lock(lowerdvp, LK_EXCLUSIVE | LK_RETRY); 393 1.21.10.2 pooka 394 1.21.10.2 pooka /* 395 1.21.10.2 pooka * Only do a LOOKUP on the bottom node, since 396 1.21.10.2 pooka * we won't be making changes to it anyway. 397 1.21.10.2 pooka */ 398 1.21.10.2 pooka nameiop = cnp->cn_nameiop; 399 1.21.10.2 pooka cnp->cn_nameiop = LOOKUP; 400 1.21.10.2 pooka if (um->um_op == UNMNT_BELOW) { 401 1.21.10.2 pooka saved_cred = cnp->cn_cred; 402 1.21.10.2 pooka cnp->cn_cred = um->um_cred; 403 1.21.10.2 pooka } 404 1.21.10.2 pooka 405 1.21.10.2 pooka /* 406 1.21.10.2 pooka * we shouldn't have to worry about locking interactions 407 1.21.10.2 pooka * between the lower layer and our union layer (w.r.t. 408 1.21.10.2 pooka * `..' processing) because we don't futz with lowervp 409 1.21.10.2 pooka * locks in the union-node instantiation code path. 410 1.21.10.2 pooka */ 411 1.21.10.2 pooka lerror = union_lookup1(um->um_lowervp, &lowerdvp, 412 1.21.10.2 pooka &lowervp, cnp); 413 1.21.10.2 pooka if (um->um_op == UNMNT_BELOW) 414 1.21.10.2 pooka cnp->cn_cred = saved_cred; 415 1.21.10.2 pooka cnp->cn_nameiop = nameiop; 416 1.21.10.2 pooka 417 1.21.10.2 pooka if (lowervp != lowerdvp) 418 1.21.10.2 pooka VOP_UNLOCK(lowerdvp, 0); 419 1.21.10.2 pooka 420 1.21.10.2 pooka if (cnp->cn_consume != 0) { 421 1.21.10.2 pooka if (uppervp != NULLVP) { 422 1.21.10.2 pooka if (uppervp == upperdvp) 423 1.21.10.2 pooka vrele(uppervp); 424 1.21.10.2 pooka else 425 1.21.10.2 pooka vput(uppervp); 426 1.21.10.2 pooka uppervp = NULLVP; 427 1.21.10.2 pooka } 428 1.21.10.2 pooka *ap->a_vpp = lowervp; 429 1.21.10.2 pooka return (lerror); 430 1.21.10.2 pooka } 431 1.21.10.2 pooka } else { 432 1.21.10.2 pooka lerror = ENOENT; 433 1.21.10.2 pooka if ((cnp->cn_flags & ISDOTDOT) && dun->un_pvp != NULLVP) { 434 1.21.10.2 pooka lowervp = LOWERVP(dun->un_pvp); 435 1.21.10.2 pooka if (lowervp != NULLVP) { 436 1.21.10.2 pooka VREF(lowervp); 437 1.21.10.2 pooka vn_lock(lowervp, LK_EXCLUSIVE | LK_RETRY); 438 1.21.10.2 pooka lerror = 0; 439 1.21.10.2 pooka } 440 1.21.10.2 pooka } 441 1.21.10.2 pooka } 442 1.21.10.2 pooka 443 1.21.10.2 pooka /* 444 1.21.10.2 pooka * EJUSTRETURN is used by underlying filesystems to indicate that 445 1.21.10.2 pooka * a directory modification op was started successfully. 446 1.21.10.2 pooka * This will only happen in the upper layer, since 447 1.21.10.2 pooka * the lower layer only does LOOKUPs. 448 1.21.10.2 pooka * If this union is mounted read-only, bounce it now. 449 1.21.10.2 pooka */ 450 1.21.10.2 pooka 451 1.21.10.2 pooka if ((uerror == EJUSTRETURN) && (cnp->cn_flags & ISLASTCN) && 452 1.21.10.2 pooka (dvp->v_mount->mnt_flag & MNT_RDONLY) && 453 1.21.10.2 pooka ((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME))) 454 1.21.10.2 pooka uerror = EROFS; 455 1.21.10.2 pooka 456 1.21.10.2 pooka /* 457 1.21.10.2 pooka * at this point, we have uerror and lerror indicating 458 1.21.10.2 pooka * possible errors with the lookups in the upper and lower 459 1.21.10.2 pooka * layers. additionally, uppervp and lowervp are (locked) 460 1.21.10.2 pooka * references to existing vnodes in the upper and lower layers. 461 1.21.10.2 pooka * 462 1.21.10.2 pooka * there are now three cases to consider. 463 1.21.10.2 pooka * 1. if both layers returned an error, then return whatever 464 1.21.10.2 pooka * error the upper layer generated. 465 1.21.10.2 pooka * 466 1.21.10.2 pooka * 2. if the top layer failed and the bottom layer succeeded 467 1.21.10.2 pooka * then two subcases occur. 468 1.21.10.2 pooka * a. the bottom vnode is not a directory, in which 469 1.21.10.2 pooka * case just return a new union vnode referencing 470 1.21.10.2 pooka * an empty top layer and the existing bottom layer. 471 1.21.10.2 pooka * b. the bottom vnode is a directory, in which case 472 1.21.10.2 pooka * create a new directory in the top-level and 473 1.21.10.2 pooka * continue as in case 3. 474 1.21.10.2 pooka * 475 1.21.10.2 pooka * 3. if the top layer succeeded then return a new union 476 1.21.10.2 pooka * vnode referencing whatever the new top layer and 477 1.21.10.2 pooka * whatever the bottom layer returned. 478 1.21.10.2 pooka */ 479 1.21.10.2 pooka 480 1.21.10.2 pooka *ap->a_vpp = NULLVP; 481 1.21.10.2 pooka 482 1.21.10.2 pooka 483 1.21.10.2 pooka /* case 1. */ 484 1.21.10.2 pooka if ((uerror != 0) && (lerror != 0)) { 485 1.21.10.2 pooka return (uerror); 486 1.21.10.2 pooka } 487 1.21.10.2 pooka 488 1.21.10.2 pooka /* case 2. */ 489 1.21.10.2 pooka if (uerror != 0 /* && (lerror == 0) */ ) { 490 1.21.10.2 pooka if (lowervp->v_type == VDIR) { /* case 2b. */ 491 1.21.10.2 pooka /* 492 1.21.10.2 pooka * We may be racing another process to make the 493 1.21.10.2 pooka * upper-level shadow directory. Be careful with 494 1.21.10.2 pooka * locks/etc! 495 1.21.10.2 pooka */ 496 1.21.10.2 pooka if (upperdvp) { 497 1.21.10.2 pooka dun->un_flags &= ~UN_ULOCK; 498 1.21.10.2 pooka VOP_UNLOCK(upperdvp, 0); 499 1.21.10.2 pooka uerror = union_mkshadow(um, upperdvp, cnp, 500 1.21.10.2 pooka &uppervp); 501 1.21.10.2 pooka vn_lock(upperdvp, LK_EXCLUSIVE | LK_RETRY); 502 1.21.10.2 pooka dun->un_flags |= UN_ULOCK; 503 1.21.10.2 pooka } 504 1.21.10.2 pooka if (uerror) { 505 1.21.10.2 pooka if (lowervp != NULLVP) { 506 1.21.10.2 pooka vput(lowervp); 507 1.21.10.2 pooka lowervp = NULLVP; 508 1.21.10.2 pooka } 509 1.21.10.2 pooka return (uerror); 510 1.21.10.2 pooka } 511 1.21.10.2 pooka } 512 1.21.10.2 pooka } 513 1.21.10.2 pooka 514 1.21.10.2 pooka if (lowervp != NULLVP) 515 1.21.10.2 pooka VOP_UNLOCK(lowervp, 0); 516 1.21.10.2 pooka 517 1.21.10.2 pooka error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp, 518 1.21.10.2 pooka uppervp, lowervp, 1); 519 1.21.10.2 pooka 520 1.21.10.2 pooka if (error) { 521 1.21.10.2 pooka if (uppervp != NULLVP) 522 1.21.10.2 pooka vput(uppervp); 523 1.21.10.2 pooka if (lowervp != NULLVP) 524 1.21.10.2 pooka vrele(lowervp); 525 1.21.10.2 pooka } 526 1.21.10.2 pooka 527 1.21.10.2 pooka return (error); 528 1.21.10.2 pooka } 529 1.21.10.2 pooka 530 1.21.10.2 pooka int 531 1.21.10.2 pooka union_create(v) 532 1.21.10.2 pooka void *v; 533 1.21.10.2 pooka { 534 1.21.10.2 pooka struct vop_create_args /* { 535 1.21.10.2 pooka struct vnode *a_dvp; 536 1.21.10.2 pooka struct vnode **a_vpp; 537 1.21.10.2 pooka struct componentname *a_cnp; 538 1.21.10.2 pooka struct vattr *a_vap; 539 1.21.10.2 pooka } */ *ap = v; 540 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_dvp); 541 1.21.10.2 pooka struct vnode *dvp = un->un_uppervp; 542 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 543 1.21.10.2 pooka 544 1.21.10.2 pooka if (dvp != NULLVP) { 545 1.21.10.2 pooka int error; 546 1.21.10.2 pooka struct vnode *vp; 547 1.21.10.2 pooka struct mount *mp; 548 1.21.10.2 pooka 549 1.21.10.2 pooka FIXUP(un); 550 1.21.10.2 pooka 551 1.21.10.2 pooka VREF(dvp); 552 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 553 1.21.10.2 pooka mp = ap->a_dvp->v_mount; 554 1.21.10.2 pooka vput(ap->a_dvp); 555 1.21.10.2 pooka error = VOP_CREATE(dvp, &vp, cnp, ap->a_vap); 556 1.21.10.2 pooka if (error) 557 1.21.10.2 pooka return (error); 558 1.21.10.2 pooka 559 1.21.10.2 pooka error = union_allocvp(ap->a_vpp, mp, NULLVP, NULLVP, cnp, vp, 560 1.21.10.2 pooka NULLVP, 1); 561 1.21.10.2 pooka if (error) 562 1.21.10.2 pooka vput(vp); 563 1.21.10.2 pooka return (error); 564 1.21.10.2 pooka } 565 1.21.10.2 pooka 566 1.21.10.2 pooka vput(ap->a_dvp); 567 1.21.10.2 pooka return (EROFS); 568 1.21.10.2 pooka } 569 1.21.10.2 pooka 570 1.21.10.2 pooka int 571 1.21.10.2 pooka union_whiteout(v) 572 1.21.10.2 pooka void *v; 573 1.21.10.2 pooka { 574 1.21.10.2 pooka struct vop_whiteout_args /* { 575 1.21.10.2 pooka struct vnode *a_dvp; 576 1.21.10.2 pooka struct componentname *a_cnp; 577 1.21.10.2 pooka int a_flags; 578 1.21.10.2 pooka } */ *ap = v; 579 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_dvp); 580 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 581 1.21.10.2 pooka 582 1.21.10.2 pooka if (un->un_uppervp == NULLVP) 583 1.21.10.2 pooka return (EOPNOTSUPP); 584 1.21.10.2 pooka 585 1.21.10.2 pooka FIXUP(un); 586 1.21.10.2 pooka return (VOP_WHITEOUT(un->un_uppervp, cnp, ap->a_flags)); 587 1.21.10.2 pooka } 588 1.21.10.2 pooka 589 1.21.10.2 pooka int 590 1.21.10.2 pooka union_mknod(v) 591 1.21.10.2 pooka void *v; 592 1.21.10.2 pooka { 593 1.21.10.2 pooka struct vop_mknod_args /* { 594 1.21.10.2 pooka struct vnode *a_dvp; 595 1.21.10.2 pooka struct vnode **a_vpp; 596 1.21.10.2 pooka struct componentname *a_cnp; 597 1.21.10.2 pooka struct vattr *a_vap; 598 1.21.10.2 pooka } */ *ap = v; 599 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_dvp); 600 1.21.10.2 pooka struct vnode *dvp = un->un_uppervp; 601 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 602 1.21.10.2 pooka 603 1.21.10.2 pooka if (dvp != NULLVP) { 604 1.21.10.2 pooka int error; 605 1.21.10.2 pooka struct vnode *vp; 606 1.21.10.2 pooka struct mount *mp; 607 1.21.10.2 pooka 608 1.21.10.2 pooka FIXUP(un); 609 1.21.10.2 pooka 610 1.21.10.2 pooka VREF(dvp); 611 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 612 1.21.10.2 pooka mp = ap->a_dvp->v_mount; 613 1.21.10.2 pooka vput(ap->a_dvp); 614 1.21.10.2 pooka error = VOP_MKNOD(dvp, &vp, cnp, ap->a_vap); 615 1.21.10.2 pooka if (error) 616 1.21.10.2 pooka return (error); 617 1.21.10.2 pooka 618 1.21.10.2 pooka error = union_allocvp(ap->a_vpp, mp, NULLVP, NULLVP, 619 1.21.10.2 pooka cnp, vp, NULLVP, 1); 620 1.21.10.2 pooka if (error) 621 1.21.10.2 pooka vput(vp); 622 1.21.10.2 pooka return (error); 623 1.21.10.2 pooka } 624 1.21.10.2 pooka 625 1.21.10.2 pooka vput(ap->a_dvp); 626 1.21.10.2 pooka return (EROFS); 627 1.21.10.2 pooka } 628 1.21.10.2 pooka 629 1.21.10.2 pooka int 630 1.21.10.2 pooka union_open(v) 631 1.21.10.2 pooka void *v; 632 1.21.10.2 pooka { 633 1.21.10.2 pooka struct vop_open_args /* { 634 1.21.10.2 pooka struct vnodeop_desc *a_desc; 635 1.21.10.2 pooka struct vnode *a_vp; 636 1.21.10.2 pooka int a_mode; 637 1.21.10.2 pooka kauth_cred_t a_cred; 638 1.21.10.2 pooka struct lwp *a_l; 639 1.21.10.2 pooka } */ *ap = v; 640 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 641 1.21.10.2 pooka struct vnode *tvp; 642 1.21.10.2 pooka int mode = ap->a_mode; 643 1.21.10.2 pooka kauth_cred_t cred = ap->a_cred; 644 1.21.10.2 pooka struct lwp *l = ap->a_l; 645 1.21.10.2 pooka int error; 646 1.21.10.2 pooka 647 1.21.10.2 pooka /* 648 1.21.10.2 pooka * If there is an existing upper vp then simply open that. 649 1.21.10.2 pooka */ 650 1.21.10.2 pooka tvp = un->un_uppervp; 651 1.21.10.2 pooka if (tvp == NULLVP) { 652 1.21.10.2 pooka /* 653 1.21.10.2 pooka * If the lower vnode is being opened for writing, then 654 1.21.10.2 pooka * copy the file contents to the upper vnode and open that, 655 1.21.10.2 pooka * otherwise can simply open the lower vnode. 656 1.21.10.2 pooka */ 657 1.21.10.2 pooka tvp = un->un_lowervp; 658 1.21.10.2 pooka if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) { 659 1.21.10.2 pooka error = union_copyup(un, (mode&O_TRUNC) == 0, cred, l); 660 1.21.10.2 pooka if (error == 0) 661 1.21.10.2 pooka error = VOP_OPEN(un->un_uppervp, mode, cred, l); 662 1.21.10.2 pooka return (error); 663 1.21.10.2 pooka } 664 1.21.10.2 pooka 665 1.21.10.2 pooka /* 666 1.21.10.2 pooka * Just open the lower vnode, but check for nodev mount flag 667 1.21.10.2 pooka */ 668 1.21.10.2 pooka if ((tvp->v_type == VBLK || tvp->v_type == VCHR) && 669 1.21.10.2 pooka (ap->a_vp->v_mount->mnt_flag & MNT_NODEV)) 670 1.21.10.2 pooka return ENXIO; 671 1.21.10.2 pooka un->un_openl++; 672 1.21.10.2 pooka vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY); 673 1.21.10.2 pooka error = VOP_OPEN(tvp, mode, cred, l); 674 1.21.10.2 pooka VOP_UNLOCK(tvp, 0); 675 1.21.10.2 pooka 676 1.21.10.2 pooka return (error); 677 1.21.10.2 pooka } 678 1.21.10.2 pooka /* 679 1.21.10.2 pooka * Just open the upper vnode, checking for nodev mount flag first 680 1.21.10.2 pooka */ 681 1.21.10.2 pooka if ((tvp->v_type == VBLK || tvp->v_type == VCHR) && 682 1.21.10.2 pooka (ap->a_vp->v_mount->mnt_flag & MNT_NODEV)) 683 1.21.10.2 pooka return ENXIO; 684 1.21.10.2 pooka 685 1.21.10.2 pooka FIXUP(un); 686 1.21.10.2 pooka 687 1.21.10.2 pooka error = VOP_OPEN(tvp, mode, cred, l); 688 1.21.10.2 pooka 689 1.21.10.2 pooka return (error); 690 1.21.10.2 pooka } 691 1.21.10.2 pooka 692 1.21.10.2 pooka int 693 1.21.10.2 pooka union_close(v) 694 1.21.10.2 pooka void *v; 695 1.21.10.2 pooka { 696 1.21.10.2 pooka struct vop_close_args /* { 697 1.21.10.2 pooka struct vnode *a_vp; 698 1.21.10.2 pooka int a_fflag; 699 1.21.10.2 pooka kauth_cred_t a_cred; 700 1.21.10.2 pooka struct lwp *a_l; 701 1.21.10.2 pooka } */ *ap = v; 702 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 703 1.21.10.2 pooka struct vnode *vp; 704 1.21.10.2 pooka 705 1.21.10.2 pooka vp = un->un_uppervp; 706 1.21.10.2 pooka if (vp == NULLVP) { 707 1.21.10.2 pooka #ifdef UNION_DIAGNOSTIC 708 1.21.10.2 pooka if (un->un_openl <= 0) 709 1.21.10.2 pooka panic("union: un_openl cnt"); 710 1.21.10.2 pooka #endif 711 1.21.10.2 pooka --un->un_openl; 712 1.21.10.2 pooka vp = un->un_lowervp; 713 1.21.10.2 pooka } 714 1.21.10.2 pooka 715 1.21.10.2 pooka #ifdef DIAGNOSTIC 716 1.21.10.2 pooka if (vp == NULLVP) 717 1.21.10.2 pooka panic("union_close empty union vnode"); 718 1.21.10.2 pooka #endif 719 1.21.10.2 pooka 720 1.21.10.2 pooka ap->a_vp = vp; 721 1.21.10.2 pooka return (VCALL(vp, VOFFSET(vop_close), ap)); 722 1.21.10.2 pooka } 723 1.21.10.2 pooka 724 1.21.10.2 pooka /* 725 1.21.10.2 pooka * Check access permission on the union vnode. 726 1.21.10.2 pooka * The access check being enforced is to check 727 1.21.10.2 pooka * against both the underlying vnode, and any 728 1.21.10.2 pooka * copied vnode. This ensures that no additional 729 1.21.10.2 pooka * file permissions are given away simply because 730 1.21.10.2 pooka * the user caused an implicit file copy. 731 1.21.10.2 pooka */ 732 1.21.10.2 pooka int 733 1.21.10.2 pooka union_access(v) 734 1.21.10.2 pooka void *v; 735 1.21.10.2 pooka { 736 1.21.10.2 pooka struct vop_access_args /* { 737 1.21.10.2 pooka struct vnodeop_desc *a_desc; 738 1.21.10.2 pooka struct vnode *a_vp; 739 1.21.10.2 pooka int a_mode; 740 1.21.10.2 pooka kauth_cred_t a_cred; 741 1.21.10.2 pooka struct lwp *a_l; 742 1.21.10.2 pooka } */ *ap = v; 743 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 744 1.21.10.2 pooka struct union_node *un = VTOUNION(vp); 745 1.21.10.2 pooka int error = EACCES; 746 1.21.10.2 pooka struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount); 747 1.21.10.2 pooka 748 1.21.10.2 pooka /* 749 1.21.10.2 pooka * Disallow write attempts on read-only file systems; 750 1.21.10.2 pooka * unless the file is a socket, fifo, or a block or 751 1.21.10.2 pooka * character device resident on the file system. 752 1.21.10.2 pooka */ 753 1.21.10.2 pooka if (ap->a_mode & VWRITE) { 754 1.21.10.2 pooka switch (vp->v_type) { 755 1.21.10.2 pooka case VDIR: 756 1.21.10.2 pooka case VLNK: 757 1.21.10.2 pooka case VREG: 758 1.21.10.2 pooka if (vp->v_mount->mnt_flag & MNT_RDONLY) 759 1.21.10.2 pooka return (EROFS); 760 1.21.10.2 pooka break; 761 1.21.10.2 pooka case VBAD: 762 1.21.10.2 pooka case VBLK: 763 1.21.10.2 pooka case VCHR: 764 1.21.10.2 pooka case VSOCK: 765 1.21.10.2 pooka case VFIFO: 766 1.21.10.2 pooka case VNON: 767 1.21.10.2 pooka default: 768 1.21.10.2 pooka break; 769 1.21.10.2 pooka } 770 1.21.10.2 pooka } 771 1.21.10.2 pooka 772 1.21.10.2 pooka 773 1.21.10.2 pooka if ((vp = un->un_uppervp) != NULLVP) { 774 1.21.10.2 pooka FIXUP(un); 775 1.21.10.2 pooka ap->a_vp = vp; 776 1.21.10.2 pooka return (VCALL(vp, VOFFSET(vop_access), ap)); 777 1.21.10.2 pooka } 778 1.21.10.2 pooka 779 1.21.10.2 pooka if ((vp = un->un_lowervp) != NULLVP) { 780 1.21.10.2 pooka vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 781 1.21.10.2 pooka ap->a_vp = vp; 782 1.21.10.2 pooka error = VCALL(vp, VOFFSET(vop_access), ap); 783 1.21.10.2 pooka if (error == 0) { 784 1.21.10.2 pooka if (um->um_op == UNMNT_BELOW) { 785 1.21.10.2 pooka ap->a_cred = um->um_cred; 786 1.21.10.2 pooka error = VCALL(vp, VOFFSET(vop_access), ap); 787 1.21.10.2 pooka } 788 1.21.10.2 pooka } 789 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 790 1.21.10.2 pooka if (error) 791 1.21.10.2 pooka return (error); 792 1.21.10.2 pooka } 793 1.21.10.2 pooka 794 1.21.10.2 pooka return (error); 795 1.21.10.2 pooka } 796 1.21.10.2 pooka 797 1.21.10.2 pooka /* 798 1.21.10.2 pooka * We handle getattr only to change the fsid and 799 1.21.10.2 pooka * track object sizes 800 1.21.10.2 pooka */ 801 1.21.10.2 pooka int 802 1.21.10.2 pooka union_getattr(v) 803 1.21.10.2 pooka void *v; 804 1.21.10.2 pooka { 805 1.21.10.2 pooka struct vop_getattr_args /* { 806 1.21.10.2 pooka struct vnode *a_vp; 807 1.21.10.2 pooka struct vattr *a_vap; 808 1.21.10.2 pooka kauth_cred_t a_cred; 809 1.21.10.2 pooka struct lwp *a_l; 810 1.21.10.2 pooka } */ *ap = v; 811 1.21.10.2 pooka int error; 812 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 813 1.21.10.2 pooka struct vnode *vp = un->un_uppervp; 814 1.21.10.2 pooka struct vattr *vap; 815 1.21.10.2 pooka struct vattr va; 816 1.21.10.2 pooka 817 1.21.10.2 pooka 818 1.21.10.2 pooka /* 819 1.21.10.2 pooka * Some programs walk the filesystem hierarchy by counting 820 1.21.10.2 pooka * links to directories to avoid stat'ing all the time. 821 1.21.10.2 pooka * This means the link count on directories needs to be "correct". 822 1.21.10.2 pooka * The only way to do that is to call getattr on both layers 823 1.21.10.2 pooka * and fix up the link count. The link count will not necessarily 824 1.21.10.2 pooka * be accurate but will be large enough to defeat the tree walkers. 825 1.21.10.2 pooka * 826 1.21.10.2 pooka * To make life more interesting, some filesystems don't keep 827 1.21.10.2 pooka * track of link counts in the expected way, and return a 828 1.21.10.2 pooka * link count of `1' for those directories; if either of the 829 1.21.10.2 pooka * component directories returns a link count of `1', we return a 1. 830 1.21.10.2 pooka */ 831 1.21.10.2 pooka 832 1.21.10.2 pooka vap = ap->a_vap; 833 1.21.10.2 pooka 834 1.21.10.2 pooka vp = un->un_uppervp; 835 1.21.10.2 pooka if (vp != NULLVP) { 836 1.21.10.2 pooka /* 837 1.21.10.2 pooka * It's not clear whether VOP_GETATTR is to be 838 1.21.10.2 pooka * called with the vnode locked or not. stat() calls 839 1.21.10.2 pooka * it with (vp) locked, and fstat calls it with 840 1.21.10.2 pooka * (vp) unlocked. 841 1.21.10.2 pooka * In the mean time, compensate here by checking 842 1.21.10.2 pooka * the union_node's lock flag. 843 1.21.10.2 pooka */ 844 1.21.10.2 pooka if (un->un_flags & UN_LOCKED) 845 1.21.10.2 pooka FIXUP(un); 846 1.21.10.2 pooka 847 1.21.10.2 pooka error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_l); 848 1.21.10.2 pooka if (error) 849 1.21.10.2 pooka return (error); 850 1.21.10.2 pooka union_newsize(ap->a_vp, vap->va_size, VNOVAL); 851 1.21.10.2 pooka } 852 1.21.10.2 pooka 853 1.21.10.2 pooka if (vp == NULLVP) { 854 1.21.10.2 pooka vp = un->un_lowervp; 855 1.21.10.2 pooka } else if (vp->v_type == VDIR) { 856 1.21.10.2 pooka vp = un->un_lowervp; 857 1.21.10.2 pooka if (vp != NULLVP) 858 1.21.10.2 pooka vap = &va; 859 1.21.10.2 pooka } else { 860 1.21.10.2 pooka vp = NULLVP; 861 1.21.10.2 pooka } 862 1.21.10.2 pooka 863 1.21.10.2 pooka if (vp != NULLVP) { 864 1.21.10.2 pooka error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_l); 865 1.21.10.2 pooka if (error) 866 1.21.10.2 pooka return (error); 867 1.21.10.2 pooka union_newsize(ap->a_vp, VNOVAL, vap->va_size); 868 1.21.10.2 pooka } 869 1.21.10.2 pooka 870 1.21.10.2 pooka if ((vap != ap->a_vap) && (vap->va_type == VDIR)) { 871 1.21.10.2 pooka /* 872 1.21.10.2 pooka * Link count manipulation: 873 1.21.10.2 pooka * - If both return "2", return 2 (no subdirs) 874 1.21.10.2 pooka * - If one or the other return "1", return "1" (ENOCLUE) 875 1.21.10.2 pooka */ 876 1.21.10.2 pooka if ((ap->a_vap->va_nlink == 2) && 877 1.21.10.2 pooka (vap->va_nlink == 2)) 878 1.21.10.2 pooka ; 879 1.21.10.2 pooka else if (ap->a_vap->va_nlink != 1) { 880 1.21.10.2 pooka if (vap->va_nlink == 1) 881 1.21.10.2 pooka ap->a_vap->va_nlink = 1; 882 1.21.10.2 pooka else 883 1.21.10.2 pooka ap->a_vap->va_nlink += vap->va_nlink; 884 1.21.10.2 pooka } 885 1.21.10.2 pooka } 886 1.21.10.2 pooka ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 887 1.21.10.2 pooka return (0); 888 1.21.10.2 pooka } 889 1.21.10.2 pooka 890 1.21.10.2 pooka int 891 1.21.10.2 pooka union_setattr(v) 892 1.21.10.2 pooka void *v; 893 1.21.10.2 pooka { 894 1.21.10.2 pooka struct vop_setattr_args /* { 895 1.21.10.2 pooka struct vnode *a_vp; 896 1.21.10.2 pooka struct vattr *a_vap; 897 1.21.10.2 pooka kauth_cred_t a_cred; 898 1.21.10.2 pooka struct lwp *a_l; 899 1.21.10.2 pooka } */ *ap = v; 900 1.21.10.2 pooka struct vattr *vap = ap->a_vap; 901 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 902 1.21.10.2 pooka struct union_node *un = VTOUNION(vp); 903 1.21.10.2 pooka int error; 904 1.21.10.2 pooka 905 1.21.10.2 pooka if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 906 1.21.10.2 pooka vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 907 1.21.10.2 pooka vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 908 1.21.10.2 pooka (vp->v_mount->mnt_flag & MNT_RDONLY)) 909 1.21.10.2 pooka return (EROFS); 910 1.21.10.2 pooka if (vap->va_size != VNOVAL) { 911 1.21.10.2 pooka switch (vp->v_type) { 912 1.21.10.2 pooka case VDIR: 913 1.21.10.2 pooka return (EISDIR); 914 1.21.10.2 pooka case VCHR: 915 1.21.10.2 pooka case VBLK: 916 1.21.10.2 pooka case VSOCK: 917 1.21.10.2 pooka case VFIFO: 918 1.21.10.2 pooka break; 919 1.21.10.2 pooka case VREG: 920 1.21.10.2 pooka case VLNK: 921 1.21.10.2 pooka default: 922 1.21.10.2 pooka /* 923 1.21.10.2 pooka * Disallow write attempts if the filesystem is 924 1.21.10.2 pooka * mounted read-only. 925 1.21.10.2 pooka */ 926 1.21.10.2 pooka if (vp->v_mount->mnt_flag & MNT_RDONLY) 927 1.21.10.2 pooka return (EROFS); 928 1.21.10.2 pooka } 929 1.21.10.2 pooka } 930 1.21.10.2 pooka 931 1.21.10.2 pooka /* 932 1.21.10.2 pooka * Handle case of truncating lower object to zero size, 933 1.21.10.2 pooka * by creating a zero length upper object. This is to 934 1.21.10.2 pooka * handle the case of open with O_TRUNC and O_CREAT. 935 1.21.10.2 pooka */ 936 1.21.10.2 pooka if ((un->un_uppervp == NULLVP) && 937 1.21.10.2 pooka /* assert(un->un_lowervp != NULLVP) */ 938 1.21.10.2 pooka (un->un_lowervp->v_type == VREG)) { 939 1.21.10.2 pooka error = union_copyup(un, (vap->va_size != 0), 940 1.21.10.2 pooka ap->a_cred, ap->a_l); 941 1.21.10.2 pooka if (error) 942 1.21.10.2 pooka return (error); 943 1.21.10.2 pooka } 944 1.21.10.2 pooka 945 1.21.10.2 pooka /* 946 1.21.10.2 pooka * Try to set attributes in upper layer, 947 1.21.10.2 pooka * otherwise return read-only filesystem error. 948 1.21.10.2 pooka */ 949 1.21.10.2 pooka if (un->un_uppervp != NULLVP) { 950 1.21.10.2 pooka FIXUP(un); 951 1.21.10.2 pooka error = VOP_SETATTR(un->un_uppervp, vap, 952 1.21.10.2 pooka ap->a_cred, ap->a_l); 953 1.21.10.2 pooka if ((error == 0) && (vap->va_size != VNOVAL)) 954 1.21.10.2 pooka union_newsize(ap->a_vp, vap->va_size, VNOVAL); 955 1.21.10.2 pooka } else { 956 1.21.10.2 pooka error = EROFS; 957 1.21.10.2 pooka } 958 1.21.10.2 pooka 959 1.21.10.2 pooka return (error); 960 1.21.10.2 pooka } 961 1.21.10.2 pooka 962 1.21.10.2 pooka int 963 1.21.10.2 pooka union_read(v) 964 1.21.10.2 pooka void *v; 965 1.21.10.2 pooka { 966 1.21.10.2 pooka struct vop_read_args /* { 967 1.21.10.2 pooka struct vnode *a_vp; 968 1.21.10.2 pooka struct uio *a_uio; 969 1.21.10.2 pooka int a_ioflag; 970 1.21.10.2 pooka kauth_cred_t a_cred; 971 1.21.10.2 pooka } */ *ap = v; 972 1.21.10.2 pooka int error; 973 1.21.10.2 pooka struct vnode *vp = OTHERVP(ap->a_vp); 974 1.21.10.2 pooka int dolock = (vp == LOWERVP(ap->a_vp)); 975 1.21.10.2 pooka 976 1.21.10.2 pooka if (dolock) 977 1.21.10.2 pooka vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 978 1.21.10.2 pooka else 979 1.21.10.2 pooka FIXUP(VTOUNION(ap->a_vp)); 980 1.21.10.2 pooka error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); 981 1.21.10.2 pooka if (dolock) 982 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 983 1.21.10.2 pooka 984 1.21.10.2 pooka /* 985 1.21.10.2 pooka * XXX 986 1.21.10.2 pooka * perhaps the size of the underlying object has changed under 987 1.21.10.2 pooka * our feet. take advantage of the offset information present 988 1.21.10.2 pooka * in the uio structure. 989 1.21.10.2 pooka */ 990 1.21.10.2 pooka if (error == 0) { 991 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 992 1.21.10.2 pooka off_t cur = ap->a_uio->uio_offset; 993 1.21.10.2 pooka 994 1.21.10.2 pooka if (vp == un->un_uppervp) { 995 1.21.10.2 pooka if (cur > un->un_uppersz) 996 1.21.10.2 pooka union_newsize(ap->a_vp, cur, VNOVAL); 997 1.21.10.2 pooka } else { 998 1.21.10.2 pooka if (cur > un->un_lowersz) 999 1.21.10.2 pooka union_newsize(ap->a_vp, VNOVAL, cur); 1000 1.21.10.2 pooka } 1001 1.21.10.2 pooka } 1002 1.21.10.2 pooka 1003 1.21.10.2 pooka return (error); 1004 1.21.10.2 pooka } 1005 1.21.10.2 pooka 1006 1.21.10.2 pooka int 1007 1.21.10.2 pooka union_write(v) 1008 1.21.10.2 pooka void *v; 1009 1.21.10.2 pooka { 1010 1.21.10.2 pooka struct vop_read_args /* { 1011 1.21.10.2 pooka struct vnode *a_vp; 1012 1.21.10.2 pooka struct uio *a_uio; 1013 1.21.10.2 pooka int a_ioflag; 1014 1.21.10.2 pooka kauth_cred_t a_cred; 1015 1.21.10.2 pooka } */ *ap = v; 1016 1.21.10.2 pooka int error; 1017 1.21.10.2 pooka struct vnode *vp; 1018 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 1019 1.21.10.2 pooka 1020 1.21.10.2 pooka vp = UPPERVP(ap->a_vp); 1021 1.21.10.2 pooka if (vp == NULLVP) 1022 1.21.10.2 pooka panic("union: missing upper layer in write"); 1023 1.21.10.2 pooka 1024 1.21.10.2 pooka FIXUP(un); 1025 1.21.10.2 pooka error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred); 1026 1.21.10.2 pooka 1027 1.21.10.2 pooka /* 1028 1.21.10.2 pooka * the size of the underlying object may be changed by the 1029 1.21.10.2 pooka * write. 1030 1.21.10.2 pooka */ 1031 1.21.10.2 pooka if (error == 0) { 1032 1.21.10.2 pooka off_t cur = ap->a_uio->uio_offset; 1033 1.21.10.2 pooka 1034 1.21.10.2 pooka if (cur > un->un_uppersz) 1035 1.21.10.2 pooka union_newsize(ap->a_vp, cur, VNOVAL); 1036 1.21.10.2 pooka } 1037 1.21.10.2 pooka 1038 1.21.10.2 pooka return (error); 1039 1.21.10.2 pooka } 1040 1.21.10.2 pooka 1041 1.21.10.2 pooka int 1042 1.21.10.2 pooka union_lease(v) 1043 1.21.10.2 pooka void *v; 1044 1.21.10.2 pooka { 1045 1.21.10.2 pooka struct vop_lease_args /* { 1046 1.21.10.2 pooka struct vnode *a_vp; 1047 1.21.10.2 pooka struct lwp *a_l; 1048 1.21.10.2 pooka kauth_cred_t a_cred; 1049 1.21.10.2 pooka int a_flag; 1050 1.21.10.2 pooka } */ *ap = v; 1051 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1052 1.21.10.2 pooka 1053 1.21.10.2 pooka ap->a_vp = ovp; 1054 1.21.10.2 pooka return (VCALL(ovp, VOFFSET(vop_lease), ap)); 1055 1.21.10.2 pooka } 1056 1.21.10.2 pooka 1057 1.21.10.2 pooka int 1058 1.21.10.2 pooka union_ioctl(v) 1059 1.21.10.2 pooka void *v; 1060 1.21.10.2 pooka { 1061 1.21.10.2 pooka struct vop_ioctl_args /* { 1062 1.21.10.2 pooka struct vnode *a_vp; 1063 1.21.10.2 pooka int a_command; 1064 1.21.10.2 pooka void *a_data; 1065 1.21.10.2 pooka int a_fflag; 1066 1.21.10.2 pooka kauth_cred_t a_cred; 1067 1.21.10.2 pooka struct lwp *a_l; 1068 1.21.10.2 pooka } */ *ap = v; 1069 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1070 1.21.10.2 pooka 1071 1.21.10.2 pooka ap->a_vp = ovp; 1072 1.21.10.2 pooka return (VCALL(ovp, VOFFSET(vop_ioctl), ap)); 1073 1.21.10.2 pooka } 1074 1.21.10.2 pooka 1075 1.21.10.2 pooka int 1076 1.21.10.2 pooka union_poll(v) 1077 1.21.10.2 pooka void *v; 1078 1.21.10.2 pooka { 1079 1.21.10.2 pooka struct vop_poll_args /* { 1080 1.21.10.2 pooka struct vnode *a_vp; 1081 1.21.10.2 pooka int a_events; 1082 1.21.10.2 pooka struct lwp *a_l; 1083 1.21.10.2 pooka } */ *ap = v; 1084 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1085 1.21.10.2 pooka 1086 1.21.10.2 pooka ap->a_vp = ovp; 1087 1.21.10.2 pooka return (VCALL(ovp, VOFFSET(vop_poll), ap)); 1088 1.21.10.2 pooka } 1089 1.21.10.2 pooka 1090 1.21.10.2 pooka int 1091 1.21.10.2 pooka union_revoke(v) 1092 1.21.10.2 pooka void *v; 1093 1.21.10.2 pooka { 1094 1.21.10.2 pooka struct vop_revoke_args /* { 1095 1.21.10.2 pooka struct vnode *a_vp; 1096 1.21.10.2 pooka int a_flags; 1097 1.21.10.2 pooka struct proc *a_p; 1098 1.21.10.2 pooka } */ *ap = v; 1099 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 1100 1.21.10.2 pooka 1101 1.21.10.2 pooka if (UPPERVP(vp)) 1102 1.21.10.2 pooka VOP_REVOKE(UPPERVP(vp), ap->a_flags); 1103 1.21.10.2 pooka if (LOWERVP(vp)) 1104 1.21.10.2 pooka VOP_REVOKE(LOWERVP(vp), ap->a_flags); 1105 1.21.10.2 pooka vgone(vp); 1106 1.21.10.2 pooka return (0); 1107 1.21.10.2 pooka } 1108 1.21.10.2 pooka 1109 1.21.10.2 pooka int 1110 1.21.10.2 pooka union_mmap(v) 1111 1.21.10.2 pooka void *v; 1112 1.21.10.2 pooka { 1113 1.21.10.2 pooka struct vop_mmap_args /* { 1114 1.21.10.2 pooka struct vnode *a_vp; 1115 1.21.10.2 pooka vm_prot_t a_prot; 1116 1.21.10.2 pooka kauth_cred_t a_cred; 1117 1.21.10.2 pooka struct lwp *a_l; 1118 1.21.10.2 pooka } */ *ap = v; 1119 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1120 1.21.10.2 pooka 1121 1.21.10.2 pooka ap->a_vp = ovp; 1122 1.21.10.2 pooka return (VCALL(ovp, VOFFSET(vop_mmap), ap)); 1123 1.21.10.2 pooka } 1124 1.21.10.2 pooka 1125 1.21.10.2 pooka int 1126 1.21.10.2 pooka union_fsync(v) 1127 1.21.10.2 pooka void *v; 1128 1.21.10.2 pooka { 1129 1.21.10.2 pooka struct vop_fsync_args /* { 1130 1.21.10.2 pooka struct vnode *a_vp; 1131 1.21.10.2 pooka kauth_cred_t a_cred; 1132 1.21.10.2 pooka int a_flags; 1133 1.21.10.2 pooka off_t offhi; 1134 1.21.10.2 pooka off_t offlo; 1135 1.21.10.2 pooka struct lwp *a_l; 1136 1.21.10.2 pooka } */ *ap = v; 1137 1.21.10.2 pooka int error = 0; 1138 1.21.10.2 pooka struct lwp *l; 1139 1.21.10.2 pooka struct vnode *targetvp; 1140 1.21.10.2 pooka 1141 1.21.10.2 pooka /* 1142 1.21.10.2 pooka * If vinvalbuf is calling us, it's a "shallow fsync" -- don't 1143 1.21.10.2 pooka * bother syncing the underlying vnodes, since (a) they'll be 1144 1.21.10.2 pooka * fsync'ed when reclaimed and (b) we could deadlock if 1145 1.21.10.2 pooka * they're locked; otherwise, pass it through to the 1146 1.21.10.2 pooka * underlying layer. 1147 1.21.10.2 pooka */ 1148 1.21.10.2 pooka if (ap->a_flags & FSYNC_RECLAIM) 1149 1.21.10.2 pooka return 0; 1150 1.21.10.2 pooka 1151 1.21.10.2 pooka targetvp = OTHERVP(ap->a_vp); 1152 1.21.10.2 pooka l = ap->a_l; 1153 1.21.10.2 pooka 1154 1.21.10.2 pooka if (targetvp != NULLVP) { 1155 1.21.10.2 pooka int dolock = (targetvp == LOWERVP(ap->a_vp)); 1156 1.21.10.2 pooka 1157 1.21.10.2 pooka if (dolock) 1158 1.21.10.2 pooka vn_lock(targetvp, LK_EXCLUSIVE | LK_RETRY); 1159 1.21.10.2 pooka else 1160 1.21.10.2 pooka FIXUP(VTOUNION(ap->a_vp)); 1161 1.21.10.2 pooka error = VOP_FSYNC(targetvp, ap->a_cred, ap->a_flags, 1162 1.21.10.2 pooka ap->a_offlo, ap->a_offhi, l); 1163 1.21.10.2 pooka if (dolock) 1164 1.21.10.2 pooka VOP_UNLOCK(targetvp, 0); 1165 1.21.10.2 pooka } 1166 1.21.10.2 pooka 1167 1.21.10.2 pooka return (error); 1168 1.21.10.2 pooka } 1169 1.21.10.2 pooka 1170 1.21.10.2 pooka int 1171 1.21.10.2 pooka union_seek(v) 1172 1.21.10.2 pooka void *v; 1173 1.21.10.2 pooka { 1174 1.21.10.2 pooka struct vop_seek_args /* { 1175 1.21.10.2 pooka struct vnode *a_vp; 1176 1.21.10.2 pooka off_t a_oldoff; 1177 1.21.10.2 pooka off_t a_newoff; 1178 1.21.10.2 pooka kauth_cred_t a_cred; 1179 1.21.10.2 pooka } */ *ap = v; 1180 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1181 1.21.10.2 pooka 1182 1.21.10.2 pooka ap->a_vp = ovp; 1183 1.21.10.2 pooka return (VCALL(ovp, VOFFSET(vop_seek), ap)); 1184 1.21.10.2 pooka } 1185 1.21.10.2 pooka 1186 1.21.10.2 pooka int 1187 1.21.10.2 pooka union_remove(v) 1188 1.21.10.2 pooka void *v; 1189 1.21.10.2 pooka { 1190 1.21.10.2 pooka struct vop_remove_args /* { 1191 1.21.10.2 pooka struct vnode *a_dvp; 1192 1.21.10.2 pooka struct vnode *a_vp; 1193 1.21.10.2 pooka struct componentname *a_cnp; 1194 1.21.10.2 pooka } */ *ap = v; 1195 1.21.10.2 pooka int error; 1196 1.21.10.2 pooka struct union_node *dun = VTOUNION(ap->a_dvp); 1197 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 1198 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 1199 1.21.10.2 pooka 1200 1.21.10.2 pooka if (dun->un_uppervp == NULLVP) 1201 1.21.10.2 pooka panic("union remove: null upper vnode"); 1202 1.21.10.2 pooka 1203 1.21.10.2 pooka if (un->un_uppervp != NULLVP) { 1204 1.21.10.2 pooka struct vnode *dvp = dun->un_uppervp; 1205 1.21.10.2 pooka struct vnode *vp = un->un_uppervp; 1206 1.21.10.2 pooka 1207 1.21.10.2 pooka FIXUP(dun); 1208 1.21.10.2 pooka VREF(dvp); 1209 1.21.10.2 pooka dun->un_flags |= UN_KLOCK; 1210 1.21.10.2 pooka vput(ap->a_dvp); 1211 1.21.10.2 pooka FIXUP(un); 1212 1.21.10.2 pooka VREF(vp); 1213 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 1214 1.21.10.2 pooka vput(ap->a_vp); 1215 1.21.10.2 pooka 1216 1.21.10.2 pooka if (union_dowhiteout(un, cnp->cn_cred, cnp->cn_lwp)) 1217 1.21.10.2 pooka cnp->cn_flags |= DOWHITEOUT; 1218 1.21.10.2 pooka error = VOP_REMOVE(dvp, vp, cnp); 1219 1.21.10.2 pooka if (!error) 1220 1.21.10.2 pooka union_removed_upper(un); 1221 1.21.10.2 pooka } else { 1222 1.21.10.2 pooka FIXUP(dun); 1223 1.21.10.2 pooka error = union_mkwhiteout( 1224 1.21.10.2 pooka MOUNTTOUNIONMOUNT(UNIONTOV(dun)->v_mount), 1225 1.21.10.2 pooka dun->un_uppervp, ap->a_cnp, un->un_path); 1226 1.21.10.2 pooka vput(ap->a_dvp); 1227 1.21.10.2 pooka vput(ap->a_vp); 1228 1.21.10.2 pooka } 1229 1.21.10.2 pooka 1230 1.21.10.2 pooka return (error); 1231 1.21.10.2 pooka } 1232 1.21.10.2 pooka 1233 1.21.10.2 pooka int 1234 1.21.10.2 pooka union_link(v) 1235 1.21.10.2 pooka void *v; 1236 1.21.10.2 pooka { 1237 1.21.10.2 pooka struct vop_link_args /* { 1238 1.21.10.2 pooka struct vnode *a_dvp; 1239 1.21.10.2 pooka struct vnode *a_vp; 1240 1.21.10.2 pooka struct componentname *a_cnp; 1241 1.21.10.2 pooka } */ *ap = v; 1242 1.21.10.2 pooka int error = 0; 1243 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 1244 1.21.10.2 pooka struct lwp *l = cnp->cn_lwp; 1245 1.21.10.2 pooka struct union_node *dun; 1246 1.21.10.2 pooka struct vnode *vp; 1247 1.21.10.2 pooka struct vnode *dvp; 1248 1.21.10.2 pooka 1249 1.21.10.2 pooka dun = VTOUNION(ap->a_dvp); 1250 1.21.10.2 pooka 1251 1.21.10.2 pooka #ifdef DIAGNOSTIC 1252 1.21.10.2 pooka if (!(ap->a_cnp->cn_flags & LOCKPARENT)) { 1253 1.21.10.2 pooka printf("union_link called without LOCKPARENT set!\n"); 1254 1.21.10.2 pooka error = EIO; /* need some error code for "caller is a bozo" */ 1255 1.21.10.2 pooka } else 1256 1.21.10.2 pooka #endif 1257 1.21.10.2 pooka 1258 1.21.10.2 pooka 1259 1.21.10.2 pooka if (ap->a_dvp->v_op != ap->a_vp->v_op) { 1260 1.21.10.2 pooka vp = ap->a_vp; 1261 1.21.10.2 pooka } else { 1262 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 1263 1.21.10.2 pooka if (un->un_uppervp == NULLVP) { 1264 1.21.10.2 pooka /* 1265 1.21.10.2 pooka * Needs to be copied before we can link it. 1266 1.21.10.2 pooka */ 1267 1.21.10.2 pooka vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 1268 1.21.10.2 pooka if (dun->un_uppervp == un->un_dirvp) { 1269 1.21.10.2 pooka dun->un_flags &= ~UN_ULOCK; 1270 1.21.10.2 pooka VOP_UNLOCK(dun->un_uppervp, 0); 1271 1.21.10.2 pooka } 1272 1.21.10.2 pooka error = union_copyup(un, 1, cnp->cn_cred, l); 1273 1.21.10.2 pooka if (dun->un_uppervp == un->un_dirvp) { 1274 1.21.10.2 pooka /* 1275 1.21.10.2 pooka * During copyup, we dropped the lock on the 1276 1.21.10.2 pooka * dir and invalidated any saved namei lookup 1277 1.21.10.2 pooka * state for the directory we'll be entering 1278 1.21.10.2 pooka * the link in. We need to re-run the lookup 1279 1.21.10.2 pooka * in that directory to reset any state needed 1280 1.21.10.2 pooka * for VOP_LINK. 1281 1.21.10.2 pooka * Call relookup on the union-layer to reset 1282 1.21.10.2 pooka * the state. 1283 1.21.10.2 pooka */ 1284 1.21.10.2 pooka vp = NULLVP; 1285 1.21.10.2 pooka if (dun->un_uppervp == NULLVP) 1286 1.21.10.2 pooka panic("union: null upperdvp?"); 1287 1.21.10.2 pooka error = relookup(ap->a_dvp, &vp, ap->a_cnp); 1288 1.21.10.2 pooka if (error) { 1289 1.21.10.2 pooka VOP_UNLOCK(ap->a_vp, 0); 1290 1.21.10.2 pooka return EROFS; /* ? */ 1291 1.21.10.2 pooka } 1292 1.21.10.2 pooka if (vp != NULLVP) { 1293 1.21.10.2 pooka /* 1294 1.21.10.2 pooka * The name we want to create has 1295 1.21.10.2 pooka * mysteriously appeared (a race?) 1296 1.21.10.2 pooka */ 1297 1.21.10.2 pooka error = EEXIST; 1298 1.21.10.2 pooka VOP_UNLOCK(ap->a_vp, 0); 1299 1.21.10.2 pooka vput(ap->a_dvp); 1300 1.21.10.2 pooka vput(vp); 1301 1.21.10.2 pooka return (error); 1302 1.21.10.2 pooka } 1303 1.21.10.2 pooka } 1304 1.21.10.2 pooka VOP_UNLOCK(ap->a_vp, 0); 1305 1.21.10.2 pooka } 1306 1.21.10.2 pooka vp = un->un_uppervp; 1307 1.21.10.2 pooka } 1308 1.21.10.2 pooka 1309 1.21.10.2 pooka dvp = dun->un_uppervp; 1310 1.21.10.2 pooka if (dvp == NULLVP) 1311 1.21.10.2 pooka error = EROFS; 1312 1.21.10.2 pooka 1313 1.21.10.2 pooka if (error) { 1314 1.21.10.2 pooka vput(ap->a_dvp); 1315 1.21.10.2 pooka return (error); 1316 1.21.10.2 pooka } 1317 1.21.10.2 pooka 1318 1.21.10.2 pooka FIXUP(dun); 1319 1.21.10.2 pooka VREF(dvp); 1320 1.21.10.2 pooka dun->un_flags |= UN_KLOCK; 1321 1.21.10.2 pooka vput(ap->a_dvp); 1322 1.21.10.2 pooka 1323 1.21.10.2 pooka return (VOP_LINK(dvp, vp, cnp)); 1324 1.21.10.2 pooka } 1325 1.21.10.2 pooka 1326 1.21.10.2 pooka int 1327 1.21.10.2 pooka union_rename(v) 1328 1.21.10.2 pooka void *v; 1329 1.21.10.2 pooka { 1330 1.21.10.2 pooka struct vop_rename_args /* { 1331 1.21.10.2 pooka struct vnode *a_fdvp; 1332 1.21.10.2 pooka struct vnode *a_fvp; 1333 1.21.10.2 pooka struct componentname *a_fcnp; 1334 1.21.10.2 pooka struct vnode *a_tdvp; 1335 1.21.10.2 pooka struct vnode *a_tvp; 1336 1.21.10.2 pooka struct componentname *a_tcnp; 1337 1.21.10.2 pooka } */ *ap = v; 1338 1.21.10.2 pooka int error; 1339 1.21.10.2 pooka 1340 1.21.10.2 pooka struct vnode *fdvp = ap->a_fdvp; 1341 1.21.10.2 pooka struct vnode *fvp = ap->a_fvp; 1342 1.21.10.2 pooka struct vnode *tdvp = ap->a_tdvp; 1343 1.21.10.2 pooka struct vnode *tvp = ap->a_tvp; 1344 1.21.10.2 pooka 1345 1.21.10.2 pooka if (fdvp->v_op == union_vnodeop_p) { /* always true */ 1346 1.21.10.2 pooka struct union_node *un = VTOUNION(fdvp); 1347 1.21.10.2 pooka if (un->un_uppervp == NULLVP) { 1348 1.21.10.2 pooka /* 1349 1.21.10.2 pooka * this should never happen in normal 1350 1.21.10.2 pooka * operation but might if there was 1351 1.21.10.2 pooka * a problem creating the top-level shadow 1352 1.21.10.2 pooka * directory. 1353 1.21.10.2 pooka */ 1354 1.21.10.2 pooka error = EXDEV; 1355 1.21.10.2 pooka goto bad; 1356 1.21.10.2 pooka } 1357 1.21.10.2 pooka 1358 1.21.10.2 pooka fdvp = un->un_uppervp; 1359 1.21.10.2 pooka VREF(fdvp); 1360 1.21.10.2 pooka } 1361 1.21.10.2 pooka 1362 1.21.10.2 pooka if (fvp->v_op == union_vnodeop_p) { /* always true */ 1363 1.21.10.2 pooka struct union_node *un = VTOUNION(fvp); 1364 1.21.10.2 pooka if (un->un_uppervp == NULLVP) { 1365 1.21.10.2 pooka /* XXX: should do a copyup */ 1366 1.21.10.2 pooka error = EXDEV; 1367 1.21.10.2 pooka goto bad; 1368 1.21.10.2 pooka } 1369 1.21.10.2 pooka 1370 1.21.10.2 pooka if (un->un_lowervp != NULLVP) 1371 1.21.10.2 pooka ap->a_fcnp->cn_flags |= DOWHITEOUT; 1372 1.21.10.2 pooka 1373 1.21.10.2 pooka fvp = un->un_uppervp; 1374 1.21.10.2 pooka VREF(fvp); 1375 1.21.10.2 pooka } 1376 1.21.10.2 pooka 1377 1.21.10.2 pooka if (tdvp->v_op == union_vnodeop_p) { 1378 1.21.10.2 pooka struct union_node *un = VTOUNION(tdvp); 1379 1.21.10.2 pooka if (un->un_uppervp == NULLVP) { 1380 1.21.10.2 pooka /* 1381 1.21.10.2 pooka * this should never happen in normal 1382 1.21.10.2 pooka * operation but might if there was 1383 1.21.10.2 pooka * a problem creating the top-level shadow 1384 1.21.10.2 pooka * directory. 1385 1.21.10.2 pooka */ 1386 1.21.10.2 pooka error = EXDEV; 1387 1.21.10.2 pooka goto bad; 1388 1.21.10.2 pooka } 1389 1.21.10.2 pooka 1390 1.21.10.2 pooka tdvp = un->un_uppervp; 1391 1.21.10.2 pooka VREF(tdvp); 1392 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 1393 1.21.10.2 pooka vput(ap->a_tdvp); 1394 1.21.10.2 pooka } 1395 1.21.10.2 pooka 1396 1.21.10.2 pooka if (tvp != NULLVP && tvp->v_op == union_vnodeop_p) { 1397 1.21.10.2 pooka struct union_node *un = VTOUNION(tvp); 1398 1.21.10.2 pooka 1399 1.21.10.2 pooka tvp = un->un_uppervp; 1400 1.21.10.2 pooka if (tvp != NULLVP) { 1401 1.21.10.2 pooka VREF(tvp); 1402 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 1403 1.21.10.2 pooka } 1404 1.21.10.2 pooka vput(ap->a_tvp); 1405 1.21.10.2 pooka } 1406 1.21.10.2 pooka 1407 1.21.10.2 pooka error = VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp); 1408 1.21.10.2 pooka goto out; 1409 1.21.10.2 pooka 1410 1.21.10.2 pooka bad: 1411 1.21.10.2 pooka vput(tdvp); 1412 1.21.10.2 pooka if (tvp != NULLVP) 1413 1.21.10.2 pooka vput(tvp); 1414 1.21.10.2 pooka vrele(fdvp); 1415 1.21.10.2 pooka vrele(fvp); 1416 1.21.10.2 pooka 1417 1.21.10.2 pooka out: 1418 1.21.10.2 pooka if (fdvp != ap->a_fdvp) { 1419 1.21.10.2 pooka vrele(ap->a_fdvp); 1420 1.21.10.2 pooka } 1421 1.21.10.2 pooka if (fvp != ap->a_fvp) { 1422 1.21.10.2 pooka vrele(ap->a_fvp); 1423 1.21.10.2 pooka } 1424 1.21.10.2 pooka return (error); 1425 1.21.10.2 pooka } 1426 1.21.10.2 pooka 1427 1.21.10.2 pooka int 1428 1.21.10.2 pooka union_mkdir(v) 1429 1.21.10.2 pooka void *v; 1430 1.21.10.2 pooka { 1431 1.21.10.2 pooka struct vop_mkdir_args /* { 1432 1.21.10.2 pooka struct vnode *a_dvp; 1433 1.21.10.2 pooka struct vnode **a_vpp; 1434 1.21.10.2 pooka struct componentname *a_cnp; 1435 1.21.10.2 pooka struct vattr *a_vap; 1436 1.21.10.2 pooka } */ *ap = v; 1437 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_dvp); 1438 1.21.10.2 pooka struct vnode *dvp = un->un_uppervp; 1439 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 1440 1.21.10.2 pooka 1441 1.21.10.2 pooka if (dvp != NULLVP) { 1442 1.21.10.2 pooka int error; 1443 1.21.10.2 pooka struct vnode *vp; 1444 1.21.10.2 pooka 1445 1.21.10.2 pooka FIXUP(un); 1446 1.21.10.2 pooka VREF(dvp); 1447 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 1448 1.21.10.2 pooka VOP_UNLOCK(ap->a_dvp, 0); 1449 1.21.10.2 pooka error = VOP_MKDIR(dvp, &vp, cnp, ap->a_vap); 1450 1.21.10.2 pooka if (error) { 1451 1.21.10.2 pooka vrele(ap->a_dvp); 1452 1.21.10.2 pooka return (error); 1453 1.21.10.2 pooka } 1454 1.21.10.2 pooka 1455 1.21.10.2 pooka error = union_allocvp(ap->a_vpp, ap->a_dvp->v_mount, ap->a_dvp, 1456 1.21.10.2 pooka NULLVP, cnp, vp, NULLVP, 1); 1457 1.21.10.2 pooka if (error) 1458 1.21.10.2 pooka vput(vp); 1459 1.21.10.2 pooka vrele(ap->a_dvp); 1460 1.21.10.2 pooka return (error); 1461 1.21.10.2 pooka } 1462 1.21.10.2 pooka 1463 1.21.10.2 pooka vput(ap->a_dvp); 1464 1.21.10.2 pooka return (EROFS); 1465 1.21.10.2 pooka } 1466 1.21.10.2 pooka 1467 1.21.10.2 pooka int 1468 1.21.10.2 pooka union_rmdir(v) 1469 1.21.10.2 pooka void *v; 1470 1.21.10.2 pooka { 1471 1.21.10.2 pooka struct vop_rmdir_args /* { 1472 1.21.10.2 pooka struct vnode *a_dvp; 1473 1.21.10.2 pooka struct vnode *a_vp; 1474 1.21.10.2 pooka struct componentname *a_cnp; 1475 1.21.10.2 pooka } */ *ap = v; 1476 1.21.10.2 pooka int error; 1477 1.21.10.2 pooka struct union_node *dun = VTOUNION(ap->a_dvp); 1478 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 1479 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 1480 1.21.10.2 pooka 1481 1.21.10.2 pooka if (dun->un_uppervp == NULLVP) 1482 1.21.10.2 pooka panic("union rmdir: null upper vnode"); 1483 1.21.10.2 pooka 1484 1.21.10.2 pooka if (un->un_uppervp != NULLVP) { 1485 1.21.10.2 pooka struct vnode *dvp = dun->un_uppervp; 1486 1.21.10.2 pooka struct vnode *vp = un->un_uppervp; 1487 1.21.10.2 pooka 1488 1.21.10.2 pooka FIXUP(dun); 1489 1.21.10.2 pooka VREF(dvp); 1490 1.21.10.2 pooka dun->un_flags |= UN_KLOCK; 1491 1.21.10.2 pooka vput(ap->a_dvp); 1492 1.21.10.2 pooka FIXUP(un); 1493 1.21.10.2 pooka VREF(vp); 1494 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 1495 1.21.10.2 pooka vput(ap->a_vp); 1496 1.21.10.2 pooka 1497 1.21.10.2 pooka if (union_dowhiteout(un, cnp->cn_cred, cnp->cn_lwp)) 1498 1.21.10.2 pooka cnp->cn_flags |= DOWHITEOUT; 1499 1.21.10.2 pooka error = VOP_RMDIR(dvp, vp, ap->a_cnp); 1500 1.21.10.2 pooka if (!error) 1501 1.21.10.2 pooka union_removed_upper(un); 1502 1.21.10.2 pooka } else { 1503 1.21.10.2 pooka FIXUP(dun); 1504 1.21.10.2 pooka error = union_mkwhiteout( 1505 1.21.10.2 pooka MOUNTTOUNIONMOUNT(UNIONTOV(dun)->v_mount), 1506 1.21.10.2 pooka dun->un_uppervp, ap->a_cnp, un->un_path); 1507 1.21.10.2 pooka vput(ap->a_dvp); 1508 1.21.10.2 pooka vput(ap->a_vp); 1509 1.21.10.2 pooka } 1510 1.21.10.2 pooka 1511 1.21.10.2 pooka return (error); 1512 1.21.10.2 pooka } 1513 1.21.10.2 pooka 1514 1.21.10.2 pooka int 1515 1.21.10.2 pooka union_symlink(v) 1516 1.21.10.2 pooka void *v; 1517 1.21.10.2 pooka { 1518 1.21.10.2 pooka struct vop_symlink_args /* { 1519 1.21.10.2 pooka struct vnode *a_dvp; 1520 1.21.10.2 pooka struct vnode **a_vpp; 1521 1.21.10.2 pooka struct componentname *a_cnp; 1522 1.21.10.2 pooka struct vattr *a_vap; 1523 1.21.10.2 pooka char *a_target; 1524 1.21.10.2 pooka } */ *ap = v; 1525 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_dvp); 1526 1.21.10.2 pooka struct vnode *dvp = un->un_uppervp; 1527 1.21.10.2 pooka struct componentname *cnp = ap->a_cnp; 1528 1.21.10.2 pooka 1529 1.21.10.2 pooka if (dvp != NULLVP) { 1530 1.21.10.2 pooka int error; 1531 1.21.10.2 pooka 1532 1.21.10.2 pooka FIXUP(un); 1533 1.21.10.2 pooka VREF(dvp); 1534 1.21.10.2 pooka un->un_flags |= UN_KLOCK; 1535 1.21.10.2 pooka vput(ap->a_dvp); 1536 1.21.10.2 pooka error = VOP_SYMLINK(dvp, ap->a_vpp, cnp, ap->a_vap, 1537 1.21.10.2 pooka ap->a_target); 1538 1.21.10.2 pooka return (error); 1539 1.21.10.2 pooka } 1540 1.21.10.2 pooka 1541 1.21.10.2 pooka vput(ap->a_dvp); 1542 1.21.10.2 pooka return (EROFS); 1543 1.21.10.2 pooka } 1544 1.21.10.2 pooka 1545 1.21.10.2 pooka /* 1546 1.21.10.2 pooka * union_readdir works in concert with getdirentries and 1547 1.21.10.2 pooka * readdir(3) to provide a list of entries in the unioned 1548 1.21.10.2 pooka * directories. getdirentries is responsible for walking 1549 1.21.10.2 pooka * down the union stack. readdir(3) is responsible for 1550 1.21.10.2 pooka * eliminating duplicate names from the returned data stream. 1551 1.21.10.2 pooka */ 1552 1.21.10.2 pooka int 1553 1.21.10.2 pooka union_readdir(v) 1554 1.21.10.2 pooka void *v; 1555 1.21.10.2 pooka { 1556 1.21.10.2 pooka struct vop_readdir_args /* { 1557 1.21.10.2 pooka struct vnodeop_desc *a_desc; 1558 1.21.10.2 pooka struct vnode *a_vp; 1559 1.21.10.2 pooka struct uio *a_uio; 1560 1.21.10.2 pooka kauth_cred_t a_cred; 1561 1.21.10.2 pooka int *a_eofflag; 1562 1.21.10.2 pooka u_long *a_cookies; 1563 1.21.10.2 pooka int a_ncookies; 1564 1.21.10.2 pooka } */ *ap = v; 1565 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 1566 1.21.10.2 pooka struct vnode *uvp = un->un_uppervp; 1567 1.21.10.2 pooka 1568 1.21.10.2 pooka if (uvp == NULLVP) 1569 1.21.10.2 pooka return (0); 1570 1.21.10.2 pooka 1571 1.21.10.2 pooka FIXUP(un); 1572 1.21.10.2 pooka ap->a_vp = uvp; 1573 1.21.10.2 pooka return (VCALL(uvp, VOFFSET(vop_readdir), ap)); 1574 1.21.10.2 pooka } 1575 1.21.10.2 pooka 1576 1.21.10.2 pooka int 1577 1.21.10.2 pooka union_readlink(v) 1578 1.21.10.2 pooka void *v; 1579 1.21.10.2 pooka { 1580 1.21.10.2 pooka struct vop_readlink_args /* { 1581 1.21.10.2 pooka struct vnode *a_vp; 1582 1.21.10.2 pooka struct uio *a_uio; 1583 1.21.10.2 pooka kauth_cred_t a_cred; 1584 1.21.10.2 pooka } */ *ap = v; 1585 1.21.10.2 pooka int error; 1586 1.21.10.2 pooka struct vnode *vp = OTHERVP(ap->a_vp); 1587 1.21.10.2 pooka int dolock = (vp == LOWERVP(ap->a_vp)); 1588 1.21.10.2 pooka 1589 1.21.10.2 pooka if (dolock) 1590 1.21.10.2 pooka vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1591 1.21.10.2 pooka else 1592 1.21.10.2 pooka FIXUP(VTOUNION(ap->a_vp)); 1593 1.21.10.2 pooka ap->a_vp = vp; 1594 1.21.10.2 pooka error = VCALL(vp, VOFFSET(vop_readlink), ap); 1595 1.21.10.2 pooka if (dolock) 1596 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 1597 1.21.10.2 pooka 1598 1.21.10.2 pooka return (error); 1599 1.21.10.2 pooka } 1600 1.21.10.2 pooka 1601 1.21.10.2 pooka int 1602 1.21.10.2 pooka union_abortop(v) 1603 1.21.10.2 pooka void *v; 1604 1.21.10.2 pooka { 1605 1.21.10.2 pooka struct vop_abortop_args /* { 1606 1.21.10.2 pooka struct vnode *a_dvp; 1607 1.21.10.2 pooka struct componentname *a_cnp; 1608 1.21.10.2 pooka } */ *ap = v; 1609 1.21.10.2 pooka int error; 1610 1.21.10.2 pooka struct vnode *vp = OTHERVP(ap->a_dvp); 1611 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_dvp); 1612 1.21.10.2 pooka int islocked = un->un_flags & UN_LOCKED; 1613 1.21.10.2 pooka int dolock = (vp == LOWERVP(ap->a_dvp)); 1614 1.21.10.2 pooka 1615 1.21.10.2 pooka if (islocked) { 1616 1.21.10.2 pooka if (dolock) 1617 1.21.10.2 pooka vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1618 1.21.10.2 pooka else 1619 1.21.10.2 pooka FIXUP(VTOUNION(ap->a_dvp)); 1620 1.21.10.2 pooka } 1621 1.21.10.2 pooka ap->a_dvp = vp; 1622 1.21.10.2 pooka error = VCALL(vp, VOFFSET(vop_abortop), ap); 1623 1.21.10.2 pooka if (islocked && dolock) 1624 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 1625 1.21.10.2 pooka 1626 1.21.10.2 pooka return (error); 1627 1.21.10.2 pooka } 1628 1.21.10.2 pooka 1629 1.21.10.2 pooka int 1630 1.21.10.2 pooka union_inactive(v) 1631 1.21.10.2 pooka void *v; 1632 1.21.10.2 pooka { 1633 1.21.10.2 pooka struct vop_inactive_args /* { 1634 1.21.10.2 pooka const struct vnodeop_desc *a_desc; 1635 1.21.10.2 pooka struct vnode *a_vp; 1636 1.21.10.2 pooka struct lwp *a_l; 1637 1.21.10.2 pooka } */ *ap = v; 1638 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 1639 1.21.10.2 pooka struct union_node *un = VTOUNION(vp); 1640 1.21.10.2 pooka struct vnode **vpp; 1641 1.21.10.2 pooka 1642 1.21.10.2 pooka /* 1643 1.21.10.2 pooka * Do nothing (and _don't_ bypass). 1644 1.21.10.2 pooka * Wait to vrele lowervp until reclaim, 1645 1.21.10.2 pooka * so that until then our union_node is in the 1646 1.21.10.2 pooka * cache and reusable. 1647 1.21.10.2 pooka * 1648 1.21.10.2 pooka * NEEDSWORK: Someday, consider inactive'ing 1649 1.21.10.2 pooka * the lowervp and then trying to reactivate it 1650 1.21.10.2 pooka * with capabilities (v_id) 1651 1.21.10.2 pooka * like they do in the name lookup cache code. 1652 1.21.10.2 pooka * That's too much work for now. 1653 1.21.10.2 pooka */ 1654 1.21.10.2 pooka 1655 1.21.10.2 pooka if (un->un_dircache != 0) { 1656 1.21.10.2 pooka for (vpp = un->un_dircache; *vpp != NULLVP; vpp++) 1657 1.21.10.2 pooka vrele(*vpp); 1658 1.21.10.2 pooka free(un->un_dircache, M_TEMP); 1659 1.21.10.2 pooka un->un_dircache = 0; 1660 1.21.10.2 pooka } 1661 1.21.10.2 pooka 1662 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 1663 1.21.10.2 pooka 1664 1.21.10.2 pooka if ((un->un_flags & UN_CACHED) == 0) 1665 1.21.10.2 pooka vgone(vp); 1666 1.21.10.2 pooka 1667 1.21.10.2 pooka return (0); 1668 1.21.10.2 pooka } 1669 1.21.10.2 pooka 1670 1.21.10.2 pooka int 1671 1.21.10.2 pooka union_reclaim(v) 1672 1.21.10.2 pooka void *v; 1673 1.21.10.2 pooka { 1674 1.21.10.2 pooka struct vop_reclaim_args /* { 1675 1.21.10.2 pooka struct vnode *a_vp; 1676 1.21.10.2 pooka } */ *ap = v; 1677 1.21.10.2 pooka 1678 1.21.10.2 pooka union_freevp(ap->a_vp); 1679 1.21.10.2 pooka 1680 1.21.10.2 pooka return (0); 1681 1.21.10.2 pooka } 1682 1.21.10.2 pooka 1683 1.21.10.2 pooka int 1684 1.21.10.2 pooka union_lock(v) 1685 1.21.10.2 pooka void *v; 1686 1.21.10.2 pooka { 1687 1.21.10.2 pooka struct vop_lock_args /* { 1688 1.21.10.2 pooka struct vnode *a_vp; 1689 1.21.10.2 pooka int a_flags; 1690 1.21.10.2 pooka } */ *ap = v; 1691 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 1692 1.21.10.2 pooka int flags = ap->a_flags; 1693 1.21.10.2 pooka struct union_node *un; 1694 1.21.10.2 pooka int error; 1695 1.21.10.2 pooka #ifdef DIAGNOSTIC 1696 1.21.10.2 pooka int drain = 0; 1697 1.21.10.2 pooka #endif 1698 1.21.10.2 pooka 1699 1.21.10.2 pooka /* XXX unionfs can't handle shared locks yet */ 1700 1.21.10.2 pooka if ((flags & LK_TYPE_MASK) == LK_SHARED) { 1701 1.21.10.2 pooka flags = LK_EXCLUSIVE | (flags & ~LK_TYPE_MASK); 1702 1.21.10.2 pooka } 1703 1.21.10.2 pooka 1704 1.21.10.2 pooka genfs_nolock(ap); 1705 1.21.10.2 pooka /* 1706 1.21.10.2 pooka * Need to do real lockmgr-style locking here. 1707 1.21.10.2 pooka * in the mean time, draining won't work quite right, 1708 1.21.10.2 pooka * which could lead to a few race conditions. 1709 1.21.10.2 pooka * the following test was here, but is not quite right, we 1710 1.21.10.2 pooka * still need to take the lock: 1711 1.21.10.2 pooka if ((flags & LK_TYPE_MASK) == LK_DRAIN) 1712 1.21.10.2 pooka return (0); 1713 1.21.10.2 pooka */ 1714 1.21.10.2 pooka flags &= ~LK_INTERLOCK; 1715 1.21.10.2 pooka 1716 1.21.10.2 pooka un = VTOUNION(vp); 1717 1.21.10.2 pooka #ifdef DIAGNOSTIC 1718 1.21.10.2 pooka if (un->un_flags & (UN_DRAINING|UN_DRAINED)) { 1719 1.21.10.2 pooka if (un->un_flags & UN_DRAINED) 1720 1.21.10.2 pooka panic("union: %p: warning: locking decommissioned lock", vp); 1721 1.21.10.2 pooka if ((flags & LK_TYPE_MASK) != LK_RELEASE) 1722 1.21.10.2 pooka panic("union: %p: non-release on draining lock: %d", 1723 1.21.10.2 pooka vp, flags & LK_TYPE_MASK); 1724 1.21.10.2 pooka un->un_flags &= ~UN_DRAINING; 1725 1.21.10.2 pooka if ((flags & LK_REENABLE) == 0) 1726 1.21.10.2 pooka un->un_flags |= UN_DRAINED; 1727 1.21.10.2 pooka } 1728 1.21.10.2 pooka #endif 1729 1.21.10.2 pooka 1730 1.21.10.2 pooka /* 1731 1.21.10.2 pooka * Don't pass DRAIN through to sub-vnode lock; keep track of 1732 1.21.10.2 pooka * DRAIN state at this level, and just get an exclusive lock 1733 1.21.10.2 pooka * on the underlying vnode. 1734 1.21.10.2 pooka */ 1735 1.21.10.2 pooka if ((flags & LK_TYPE_MASK) == LK_DRAIN) { 1736 1.21.10.2 pooka #ifdef DIAGNOSTIC 1737 1.21.10.2 pooka drain = 1; 1738 1.21.10.2 pooka #endif 1739 1.21.10.2 pooka flags = LK_EXCLUSIVE | (flags & ~LK_TYPE_MASK); 1740 1.21.10.2 pooka } 1741 1.21.10.2 pooka start: 1742 1.21.10.2 pooka un = VTOUNION(vp); 1743 1.21.10.2 pooka 1744 1.21.10.2 pooka if (un->un_uppervp != NULLVP) { 1745 1.21.10.2 pooka if (((un->un_flags & UN_ULOCK) == 0) && 1746 1.21.10.2 pooka (vp->v_usecount != 0)) { 1747 1.21.10.2 pooka /* 1748 1.21.10.2 pooka * We MUST always use the order of: take upper 1749 1.21.10.2 pooka * vp lock, manipulate union node flags, drop 1750 1.21.10.2 pooka * upper vp lock. This code must not be an 1751 1.21.10.2 pooka */ 1752 1.21.10.2 pooka error = vn_lock(un->un_uppervp, flags); 1753 1.21.10.2 pooka if (error) 1754 1.21.10.2 pooka return (error); 1755 1.21.10.2 pooka un->un_flags |= UN_ULOCK; 1756 1.21.10.2 pooka } 1757 1.21.10.2 pooka #ifdef DIAGNOSTIC 1758 1.21.10.2 pooka if (un->un_flags & UN_KLOCK) { 1759 1.21.10.2 pooka vprint("union: dangling klock", vp); 1760 1.21.10.2 pooka panic("union: dangling upper lock (%p)", vp); 1761 1.21.10.2 pooka } 1762 1.21.10.2 pooka #endif 1763 1.21.10.2 pooka } 1764 1.21.10.2 pooka 1765 1.21.10.2 pooka /* XXX ignores LK_NOWAIT */ 1766 1.21.10.2 pooka if (un->un_flags & UN_LOCKED) { 1767 1.21.10.2 pooka #ifdef DIAGNOSTIC 1768 1.21.10.2 pooka if (curproc && un->un_pid == curproc->p_pid && 1769 1.21.10.2 pooka un->un_pid > -1 && curproc->p_pid > -1) 1770 1.21.10.2 pooka panic("union: locking against myself"); 1771 1.21.10.2 pooka #endif 1772 1.21.10.2 pooka un->un_flags |= UN_WANTED; 1773 1.21.10.2 pooka tsleep(&un->un_flags, PINOD, "unionlk2", 0); 1774 1.21.10.2 pooka goto start; 1775 1.21.10.2 pooka } 1776 1.21.10.2 pooka 1777 1.21.10.2 pooka #ifdef DIAGNOSTIC 1778 1.21.10.2 pooka if (curproc) 1779 1.21.10.2 pooka un->un_pid = curproc->p_pid; 1780 1.21.10.2 pooka else 1781 1.21.10.2 pooka un->un_pid = -1; 1782 1.21.10.2 pooka if (drain) 1783 1.21.10.2 pooka un->un_flags |= UN_DRAINING; 1784 1.21.10.2 pooka #endif 1785 1.21.10.2 pooka 1786 1.21.10.2 pooka un->un_flags |= UN_LOCKED; 1787 1.21.10.2 pooka return (0); 1788 1.21.10.2 pooka } 1789 1.21.10.2 pooka 1790 1.21.10.2 pooka /* 1791 1.21.10.2 pooka * When operations want to vput() a union node yet retain a lock on 1792 1.21.10.2 pooka * the upper vnode (say, to do some further operations like link(), 1793 1.21.10.2 pooka * mkdir(), ...), they set UN_KLOCK on the union node, then call 1794 1.21.10.2 pooka * vput() which calls VOP_UNLOCK() and comes here. union_unlock() 1795 1.21.10.2 pooka * unlocks the union node (leaving the upper vnode alone), clears the 1796 1.21.10.2 pooka * KLOCK flag, and then returns to vput(). The caller then does whatever 1797 1.21.10.2 pooka * is left to do with the upper vnode, and ensures that it gets unlocked. 1798 1.21.10.2 pooka * 1799 1.21.10.2 pooka * If UN_KLOCK isn't set, then the upper vnode is unlocked here. 1800 1.21.10.2 pooka */ 1801 1.21.10.2 pooka int 1802 1.21.10.2 pooka union_unlock(v) 1803 1.21.10.2 pooka void *v; 1804 1.21.10.2 pooka { 1805 1.21.10.2 pooka struct vop_unlock_args /* { 1806 1.21.10.2 pooka struct vnode *a_vp; 1807 1.21.10.2 pooka int a_flags; 1808 1.21.10.2 pooka } */ *ap = v; 1809 1.21.10.2 pooka struct union_node *un = VTOUNION(ap->a_vp); 1810 1.21.10.2 pooka 1811 1.21.10.2 pooka #ifdef DIAGNOSTIC 1812 1.21.10.2 pooka if ((un->un_flags & UN_LOCKED) == 0) 1813 1.21.10.2 pooka panic("union: unlock unlocked node"); 1814 1.21.10.2 pooka if (curproc && un->un_pid != curproc->p_pid && 1815 1.21.10.2 pooka curproc->p_pid > -1 && un->un_pid > -1) 1816 1.21.10.2 pooka panic("union: unlocking other process's union node"); 1817 1.21.10.2 pooka if (un->un_flags & UN_DRAINED) 1818 1.21.10.2 pooka panic("union: %p: warning: unlocking decommissioned lock", ap->a_vp); 1819 1.21.10.2 pooka #endif 1820 1.21.10.2 pooka 1821 1.21.10.2 pooka un->un_flags &= ~UN_LOCKED; 1822 1.21.10.2 pooka 1823 1.21.10.2 pooka if ((un->un_flags & (UN_ULOCK|UN_KLOCK)) == UN_ULOCK) 1824 1.21.10.2 pooka VOP_UNLOCK(un->un_uppervp, 0); 1825 1.21.10.2 pooka 1826 1.21.10.2 pooka un->un_flags &= ~(UN_ULOCK|UN_KLOCK); 1827 1.21.10.2 pooka 1828 1.21.10.2 pooka if (un->un_flags & UN_WANTED) { 1829 1.21.10.2 pooka un->un_flags &= ~UN_WANTED; 1830 1.21.10.2 pooka wakeup( &un->un_flags); 1831 1.21.10.2 pooka } 1832 1.21.10.2 pooka 1833 1.21.10.2 pooka #ifdef DIAGNOSTIC 1834 1.21.10.2 pooka un->un_pid = 0; 1835 1.21.10.2 pooka if (un->un_flags & UN_DRAINING) { 1836 1.21.10.2 pooka un->un_flags |= UN_DRAINED; 1837 1.21.10.2 pooka un->un_flags &= ~UN_DRAINING; 1838 1.21.10.2 pooka } 1839 1.21.10.2 pooka #endif 1840 1.21.10.2 pooka genfs_nounlock(ap); 1841 1.21.10.2 pooka 1842 1.21.10.2 pooka return (0); 1843 1.21.10.2 pooka } 1844 1.21.10.2 pooka 1845 1.21.10.2 pooka int 1846 1.21.10.2 pooka union_bmap(v) 1847 1.21.10.2 pooka void *v; 1848 1.21.10.2 pooka { 1849 1.21.10.2 pooka struct vop_bmap_args /* { 1850 1.21.10.2 pooka struct vnode *a_vp; 1851 1.21.10.2 pooka daddr_t a_bn; 1852 1.21.10.2 pooka struct vnode **a_vpp; 1853 1.21.10.2 pooka daddr_t *a_bnp; 1854 1.21.10.2 pooka int *a_runp; 1855 1.21.10.2 pooka } */ *ap = v; 1856 1.21.10.2 pooka int error; 1857 1.21.10.2 pooka struct vnode *vp = OTHERVP(ap->a_vp); 1858 1.21.10.2 pooka int dolock = (vp == LOWERVP(ap->a_vp)); 1859 1.21.10.2 pooka 1860 1.21.10.2 pooka if (dolock) 1861 1.21.10.2 pooka vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1862 1.21.10.2 pooka else 1863 1.21.10.2 pooka FIXUP(VTOUNION(ap->a_vp)); 1864 1.21.10.2 pooka ap->a_vp = vp; 1865 1.21.10.2 pooka error = VCALL(vp, VOFFSET(vop_bmap), ap); 1866 1.21.10.2 pooka if (dolock) 1867 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 1868 1.21.10.2 pooka 1869 1.21.10.2 pooka return (error); 1870 1.21.10.2 pooka } 1871 1.21.10.2 pooka 1872 1.21.10.2 pooka int 1873 1.21.10.2 pooka union_print(v) 1874 1.21.10.2 pooka void *v; 1875 1.21.10.2 pooka { 1876 1.21.10.2 pooka struct vop_print_args /* { 1877 1.21.10.2 pooka struct vnode *a_vp; 1878 1.21.10.2 pooka } */ *ap = v; 1879 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 1880 1.21.10.2 pooka 1881 1.21.10.2 pooka printf("\ttag VT_UNION, vp=%p, uppervp=%p, lowervp=%p\n", 1882 1.21.10.2 pooka vp, UPPERVP(vp), LOWERVP(vp)); 1883 1.21.10.2 pooka if (UPPERVP(vp) != NULLVP) 1884 1.21.10.2 pooka vprint("union: upper", UPPERVP(vp)); 1885 1.21.10.2 pooka if (LOWERVP(vp) != NULLVP) 1886 1.21.10.2 pooka vprint("union: lower", LOWERVP(vp)); 1887 1.21.10.2 pooka if (VTOUNION(vp)->un_dircache) { 1888 1.21.10.2 pooka struct vnode **vpp; 1889 1.21.10.2 pooka for (vpp = VTOUNION(vp)->un_dircache; *vpp != NULLVP; vpp++) 1890 1.21.10.2 pooka vprint("dircache:", *vpp); 1891 1.21.10.2 pooka } 1892 1.21.10.2 pooka 1893 1.21.10.2 pooka return (0); 1894 1.21.10.2 pooka } 1895 1.21.10.2 pooka 1896 1.21.10.2 pooka int 1897 1.21.10.2 pooka union_islocked(v) 1898 1.21.10.2 pooka void *v; 1899 1.21.10.2 pooka { 1900 1.21.10.2 pooka struct vop_islocked_args /* { 1901 1.21.10.2 pooka struct vnode *a_vp; 1902 1.21.10.2 pooka } */ *ap = v; 1903 1.21.10.2 pooka 1904 1.21.10.2 pooka return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0); 1905 1.21.10.2 pooka } 1906 1.21.10.2 pooka 1907 1.21.10.2 pooka int 1908 1.21.10.2 pooka union_pathconf(v) 1909 1.21.10.2 pooka void *v; 1910 1.21.10.2 pooka { 1911 1.21.10.2 pooka struct vop_pathconf_args /* { 1912 1.21.10.2 pooka struct vnode *a_vp; 1913 1.21.10.2 pooka int a_name; 1914 1.21.10.2 pooka int *a_retval; 1915 1.21.10.2 pooka } */ *ap = v; 1916 1.21.10.2 pooka int error; 1917 1.21.10.2 pooka struct vnode *vp = OTHERVP(ap->a_vp); 1918 1.21.10.2 pooka int dolock = (vp == LOWERVP(ap->a_vp)); 1919 1.21.10.2 pooka 1920 1.21.10.2 pooka if (dolock) 1921 1.21.10.2 pooka vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1922 1.21.10.2 pooka else 1923 1.21.10.2 pooka FIXUP(VTOUNION(ap->a_vp)); 1924 1.21.10.2 pooka ap->a_vp = vp; 1925 1.21.10.2 pooka error = VCALL(vp, VOFFSET(vop_pathconf), ap); 1926 1.21.10.2 pooka if (dolock) 1927 1.21.10.2 pooka VOP_UNLOCK(vp, 0); 1928 1.21.10.2 pooka 1929 1.21.10.2 pooka return (error); 1930 1.21.10.2 pooka } 1931 1.21.10.2 pooka 1932 1.21.10.2 pooka int 1933 1.21.10.2 pooka union_advlock(v) 1934 1.21.10.2 pooka void *v; 1935 1.21.10.2 pooka { 1936 1.21.10.2 pooka struct vop_advlock_args /* { 1937 1.21.10.2 pooka struct vnode *a_vp; 1938 1.21.10.2 pooka void *a_id; 1939 1.21.10.2 pooka int a_op; 1940 1.21.10.2 pooka struct flock *a_fl; 1941 1.21.10.2 pooka int a_flags; 1942 1.21.10.2 pooka } */ *ap = v; 1943 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1944 1.21.10.2 pooka 1945 1.21.10.2 pooka ap->a_vp = ovp; 1946 1.21.10.2 pooka return (VCALL(ovp, VOFFSET(vop_advlock), ap)); 1947 1.21.10.2 pooka } 1948 1.21.10.2 pooka 1949 1.21.10.2 pooka 1950 1.21.10.2 pooka /* 1951 1.21.10.2 pooka * XXX - vop_strategy must be hand coded because it has no 1952 1.21.10.2 pooka * vnode in its arguments. 1953 1.21.10.2 pooka * This goes away with a merged VM/buffer cache. 1954 1.21.10.2 pooka */ 1955 1.21.10.2 pooka int 1956 1.21.10.2 pooka union_strategy(v) 1957 1.21.10.2 pooka void *v; 1958 1.21.10.2 pooka { 1959 1.21.10.2 pooka struct vop_strategy_args /* { 1960 1.21.10.2 pooka struct vnode *a_vp; 1961 1.21.10.2 pooka struct buf *a_bp; 1962 1.21.10.2 pooka } */ *ap = v; 1963 1.21.10.2 pooka struct vnode *ovp = OTHERVP(ap->a_vp); 1964 1.21.10.2 pooka struct buf *bp = ap->a_bp; 1965 1.21.10.2 pooka 1966 1.21.10.2 pooka #ifdef DIAGNOSTIC 1967 1.21.10.2 pooka if (ovp == NULLVP) 1968 1.21.10.2 pooka panic("union_strategy: nil vp"); 1969 1.21.10.2 pooka if (((bp->b_flags & B_READ) == 0) && 1970 1.21.10.2 pooka (ovp == LOWERVP(bp->b_vp))) 1971 1.21.10.2 pooka panic("union_strategy: writing to lowervp"); 1972 1.21.10.2 pooka #endif 1973 1.21.10.2 pooka 1974 1.21.10.2 pooka return (VOP_STRATEGY(ovp, bp)); 1975 1.21.10.2 pooka } 1976 1.21.10.2 pooka 1977 1.21.10.2 pooka int 1978 1.21.10.2 pooka union_getpages(v) 1979 1.21.10.2 pooka void *v; 1980 1.21.10.2 pooka { 1981 1.21.10.2 pooka struct vop_getpages_args /* { 1982 1.21.10.2 pooka struct vnode *a_vp; 1983 1.21.10.2 pooka voff_t a_offset; 1984 1.21.10.2 pooka struct vm_page **a_m; 1985 1.21.10.2 pooka int *a_count; 1986 1.21.10.2 pooka int a_centeridx; 1987 1.21.10.2 pooka vm_prot_t a_access_type; 1988 1.21.10.2 pooka int a_advice; 1989 1.21.10.2 pooka int a_flags; 1990 1.21.10.2 pooka } */ *ap = v; 1991 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 1992 1.21.10.2 pooka int error; 1993 1.21.10.2 pooka 1994 1.21.10.2 pooka /* 1995 1.21.10.2 pooka * just pass the request on to the underlying layer. 1996 1.21.10.2 pooka */ 1997 1.21.10.2 pooka 1998 1.21.10.2 pooka if (ap->a_flags & PGO_LOCKED) { 1999 1.21.10.2 pooka return EBUSY; 2000 1.21.10.2 pooka } 2001 1.21.10.2 pooka ap->a_vp = OTHERVP(vp); 2002 1.21.10.2 pooka simple_unlock(&vp->v_interlock); 2003 1.21.10.2 pooka simple_lock(&ap->a_vp->v_interlock); 2004 1.21.10.2 pooka error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2005 1.21.10.2 pooka return error; 2006 1.21.10.2 pooka } 2007 1.21.10.2 pooka 2008 1.21.10.2 pooka int 2009 1.21.10.2 pooka union_putpages(v) 2010 1.21.10.2 pooka void *v; 2011 1.21.10.2 pooka { 2012 1.21.10.2 pooka struct vop_putpages_args /* { 2013 1.21.10.2 pooka struct vnode *a_vp; 2014 1.21.10.2 pooka voff_t a_offlo; 2015 1.21.10.2 pooka voff_t a_offhi; 2016 1.21.10.2 pooka int a_flags; 2017 1.21.10.2 pooka } */ *ap = v; 2018 1.21.10.2 pooka struct vnode *vp = ap->a_vp; 2019 1.21.10.2 pooka int error; 2020 1.21.10.2 pooka 2021 1.21.10.2 pooka /* 2022 1.21.10.2 pooka * just pass the request on to the underlying layer. 2023 1.21.10.2 pooka */ 2024 1.21.10.2 pooka 2025 1.21.10.2 pooka ap->a_vp = OTHERVP(vp); 2026 1.21.10.2 pooka simple_unlock(&vp->v_interlock); 2027 1.21.10.2 pooka if (ap->a_flags & PGO_RECLAIM) { 2028 1.21.10.2 pooka return 0; 2029 1.21.10.2 pooka } 2030 1.21.10.2 pooka simple_lock(&ap->a_vp->v_interlock); 2031 1.21.10.2 pooka error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2032 1.21.10.2 pooka return error; 2033 1.21.10.2 pooka } 2034 1.21.10.2 pooka 2035 1.21.10.2 pooka int 2036 1.21.10.2 pooka union_kqfilter(void *v) 2037 1.21.10.2 pooka { 2038 1.21.10.2 pooka struct vop_kqfilter_args /* { 2039 1.21.10.2 pooka struct vnode *a_vp; 2040 1.21.10.2 pooka struct knote *a_kn; 2041 1.21.10.2 pooka } */ *ap = v; 2042 1.21.10.2 pooka int error; 2043 1.21.10.2 pooka 2044 1.21.10.2 pooka /* 2045 1.21.10.2 pooka * We watch either the upper layer file (if it already exists), 2046 1.21.10.2 pooka * or the lower layer one. If there is lower layer file only 2047 1.21.10.2 pooka * at this moment, we will keep watching that lower layer file 2048 1.21.10.2 pooka * even if upper layer file would be created later on. 2049 1.21.10.2 pooka */ 2050 1.21.10.2 pooka if (UPPERVP(ap->a_vp)) 2051 1.21.10.2 pooka error = VOP_KQFILTER(UPPERVP(ap->a_vp), ap->a_kn); 2052 1.21.10.2 pooka else if (LOWERVP(ap->a_vp)) 2053 1.21.10.2 pooka error = VOP_KQFILTER(LOWERVP(ap->a_vp), ap->a_kn); 2054 1.21.10.2 pooka else { 2055 1.21.10.2 pooka /* panic? */ 2056 1.21.10.2 pooka error = EOPNOTSUPP; 2057 1.21.10.2 pooka } 2058 1.21.10.2 pooka 2059 1.21.10.2 pooka return (error); 2060 1.21.10.2 pooka } 2061
Indexes created Thu Oct 23 22:10:10 GMT 2025