1 /* $NetBSD: ext2fs_vnops.c,v 1.100 2011/07/12 16:59:48 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94 37 * Modified for ext2fs by Manuel Bouyer. 38 */ 39 40 /* 41 * Copyright (c) 1997 Manuel Bouyer. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 * 63 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94 64 * Modified for ext2fs by Manuel Bouyer. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: ext2fs_vnops.c,v 1.100 2011/07/12 16:59:48 dholland Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/resourcevar.h> 73 #include <sys/kernel.h> 74 #include <sys/file.h> 75 #include <sys/stat.h> 76 #include <sys/buf.h> 77 #include <sys/proc.h> 78 #include <sys/mount.h> 79 #include <sys/namei.h> 80 #include <sys/vnode.h> 81 #include <sys/lockf.h> 82 #include <sys/malloc.h> 83 #include <sys/pool.h> 84 #include <sys/signalvar.h> 85 #include <sys/kauth.h> 86 87 #include <miscfs/fifofs/fifo.h> 88 #include <miscfs/genfs/genfs.h> 89 #include <miscfs/specfs/specdev.h> 90 91 #include <ufs/ufs/inode.h> 92 #include <ufs/ufs/ufs_extern.h> 93 #include <ufs/ufs/ufsmount.h> 94 95 #include <ufs/ext2fs/ext2fs.h> 96 #include <ufs/ext2fs/ext2fs_extern.h> 97 #include <ufs/ext2fs/ext2fs_dir.h> 98 99 extern int prtactive; 100 101 static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *); 102 static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 103 struct lwp *); 104 105 union _qcvt { 106 int64_t qcvt; 107 int32_t val[2]; 108 }; 109 110 #define SETHIGH(q, h) { \ 111 union _qcvt tmp; \ 112 tmp.qcvt = (q); \ 113 tmp.val[_QUAD_HIGHWORD] = (h); \ 114 (q) = tmp.qcvt; \ 115 } 116 #define SETLOW(q, l) { \ 117 union _qcvt tmp; \ 118 tmp.qcvt = (q); \ 119 tmp.val[_QUAD_LOWWORD] = (l); \ 120 (q) = tmp.qcvt; \ 121 } 122 123 /* 124 * Create a regular file 125 */ 126 int 127 ext2fs_create(void *v) 128 { 129 struct vop_create_args /* { 130 struct vnode *a_dvp; 131 struct vnode **a_vpp; 132 struct componentname *a_cnp; 133 struct vattr *a_vap; 134 } */ *ap = v; 135 int error; 136 137 error = 138 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 139 ap->a_dvp, ap->a_vpp, ap->a_cnp); 140 141 if (error) 142 return (error); 143 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 144 return (0); 145 } 146 147 /* 148 * Mknod vnode call 149 */ 150 /* ARGSUSED */ 151 int 152 ext2fs_mknod(void *v) 153 { 154 struct vop_mknod_args /* { 155 struct vnode *a_dvp; 156 struct vnode **a_vpp; 157 struct componentname *a_cnp; 158 struct vattr *a_vap; 159 } */ *ap = v; 160 struct vattr *vap = ap->a_vap; 161 struct vnode **vpp = ap->a_vpp; 162 struct inode *ip; 163 int error; 164 struct mount *mp; 165 ino_t ino; 166 167 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 168 ap->a_dvp, vpp, ap->a_cnp)) != 0) 169 return (error); 170 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 171 ip = VTOI(*vpp); 172 mp = (*vpp)->v_mount; 173 ino = ip->i_number; 174 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 175 if (vap->va_rdev != VNOVAL) { 176 /* 177 * Want to be able to use this to make badblock 178 * inodes, so don't truncate the dev number. 179 */ 180 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 181 } 182 /* 183 * Remove inode so that it will be reloaded by VFS_VGET and 184 * checked to see if it is an alias of an existing entry in 185 * the inode cache. 186 */ 187 VOP_UNLOCK(*vpp); 188 (*vpp)->v_type = VNON; 189 vgone(*vpp); 190 error = VFS_VGET(mp, ino, vpp); 191 if (error != 0) { 192 *vpp = NULL; 193 return (error); 194 } 195 return (0); 196 } 197 198 /* 199 * Open called. 200 * 201 * Just check the APPEND flag. 202 */ 203 /* ARGSUSED */ 204 int 205 ext2fs_open(void *v) 206 { 207 struct vop_open_args /* { 208 struct vnode *a_vp; 209 int a_mode; 210 kauth_cred_t a_cred; 211 } */ *ap = v; 212 213 /* 214 * Files marked append-only must be opened for appending. 215 */ 216 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 217 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 218 return (EPERM); 219 return (0); 220 } 221 222 static int 223 ext2fs_check_possible(struct vnode *vp, struct inode *ip, mode_t mode) 224 { 225 226 /* 227 * Disallow write attempts on read-only file systems; 228 * unless the file is a socket, fifo, or a block or 229 * character device resident on the file system. 230 */ 231 if (mode & VWRITE) { 232 switch (vp->v_type) { 233 case VDIR: 234 case VLNK: 235 case VREG: 236 if (vp->v_mount->mnt_flag & MNT_RDONLY) 237 return (EROFS); 238 break; 239 default: 240 break; 241 } 242 } 243 244 /* If immutable bit set, nobody gets to write it. */ 245 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 246 return (EPERM); 247 248 return 0; 249 } 250 251 static int 252 ext2fs_check_permitted(struct vnode *vp, struct inode *ip, mode_t mode, 253 kauth_cred_t cred) 254 { 255 256 return genfs_can_access(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 257 ip->i_uid, ip->i_gid, mode, cred); 258 } 259 260 int 261 ext2fs_access(void *v) 262 { 263 struct vop_access_args /* { 264 struct vnode *a_vp; 265 int a_mode; 266 kauth_cred_t a_cred; 267 } */ *ap = v; 268 struct vnode *vp = ap->a_vp; 269 struct inode *ip = VTOI(vp); 270 mode_t mode = ap->a_mode; 271 int error; 272 273 error = ext2fs_check_possible(vp, ip, mode); 274 if (error) 275 return error; 276 277 error = ext2fs_check_permitted(vp, ip, mode, ap->a_cred); 278 279 return error; 280 } 281 282 /* ARGSUSED */ 283 int 284 ext2fs_getattr(void *v) 285 { 286 struct vop_getattr_args /* { 287 struct vnode *a_vp; 288 struct vattr *a_vap; 289 kauth_cred_t a_cred; 290 } */ *ap = v; 291 struct vnode *vp = ap->a_vp; 292 struct inode *ip = VTOI(vp); 293 struct vattr *vap = ap->a_vap; 294 295 EXT2FS_ITIMES(ip, NULL, NULL, NULL); 296 /* 297 * Copy from inode table 298 */ 299 vap->va_fsid = ip->i_dev; 300 vap->va_fileid = ip->i_number; 301 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 302 vap->va_nlink = ip->i_e2fs_nlink; 303 vap->va_uid = ip->i_uid; 304 vap->va_gid = ip->i_gid; 305 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 306 vap->va_size = vp->v_size; 307 vap->va_atime.tv_sec = ip->i_e2fs_atime; 308 vap->va_atime.tv_nsec = 0; 309 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 310 vap->va_mtime.tv_nsec = 0; 311 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 312 vap->va_ctime.tv_nsec = 0; 313 #ifdef EXT2FS_SYSTEM_FLAGS 314 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 315 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 316 #else 317 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 318 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 319 #endif 320 vap->va_gen = ip->i_e2fs_gen; 321 /* this doesn't belong here */ 322 if (vp->v_type == VBLK) 323 vap->va_blocksize = BLKDEV_IOSIZE; 324 else if (vp->v_type == VCHR) 325 vap->va_blocksize = MAXBSIZE; 326 else 327 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 328 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 329 vap->va_type = vp->v_type; 330 vap->va_filerev = ip->i_modrev; 331 return (0); 332 } 333 334 /* 335 * Set attribute vnode op. called from several syscalls 336 */ 337 int 338 ext2fs_setattr(void *v) 339 { 340 struct vop_setattr_args /* { 341 struct vnode *a_vp; 342 struct vattr *a_vap; 343 kauth_cred_t a_cred; 344 } */ *ap = v; 345 struct vattr *vap = ap->a_vap; 346 struct vnode *vp = ap->a_vp; 347 struct inode *ip = VTOI(vp); 348 kauth_cred_t cred = ap->a_cred; 349 struct lwp *l = curlwp; 350 int error; 351 352 /* 353 * Check for unsettable attributes. 354 */ 355 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 356 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 357 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 358 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 359 return (EINVAL); 360 } 361 if (vap->va_flags != VNOVAL) { 362 if (vp->v_mount->mnt_flag & MNT_RDONLY) 363 return (EROFS); 364 if (kauth_cred_geteuid(cred) != ip->i_uid && 365 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 366 NULL))) 367 return (error); 368 #ifdef EXT2FS_SYSTEM_FLAGS 369 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 370 NULL) == 0) { 371 if ((ip->i_e2fs_flags & 372 (EXT2_APPEND | EXT2_IMMUTABLE)) && 373 kauth_authorize_system(l->l_cred, 374 KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL)) 375 return (EPERM); 376 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 377 ip->i_e2fs_flags |= 378 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 379 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 380 } else 381 return (EPERM); 382 #else 383 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 384 ip->i_e2fs_flags |= 385 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 386 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 387 #endif 388 ip->i_flag |= IN_CHANGE; 389 if (vap->va_flags & (IMMUTABLE | APPEND)) 390 return (0); 391 } 392 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 393 return (EPERM); 394 /* 395 * Go through the fields and update iff not VNOVAL. 396 */ 397 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 398 if (vp->v_mount->mnt_flag & MNT_RDONLY) 399 return (EROFS); 400 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 401 if (error) 402 return (error); 403 } 404 if (vap->va_size != VNOVAL) { 405 /* 406 * Disallow write attempts on read-only file systems; 407 * unless the file is a socket, fifo, or a block or 408 * character device resident on the file system. 409 */ 410 switch (vp->v_type) { 411 case VDIR: 412 return (EISDIR); 413 case VLNK: 414 case VREG: 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return (EROFS); 417 default: 418 break; 419 } 420 error = ext2fs_truncate(vp, vap->va_size, 0, cred); 421 if (error) 422 return (error); 423 } 424 ip = VTOI(vp); 425 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 426 if (vp->v_mount->mnt_flag & MNT_RDONLY) 427 return (EROFS); 428 error = genfs_can_chtimes(vp, vap->va_vaflags, ip->i_uid, cred); 429 if (error) 430 return (error); 431 if (vap->va_atime.tv_sec != VNOVAL) 432 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 433 ip->i_flag |= IN_ACCESS; 434 if (vap->va_mtime.tv_sec != VNOVAL) 435 ip->i_flag |= IN_CHANGE | IN_UPDATE; 436 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 437 UPDATE_WAIT); 438 if (error) 439 return (error); 440 } 441 error = 0; 442 if (vap->va_mode != (mode_t)VNOVAL) { 443 if (vp->v_mount->mnt_flag & MNT_RDONLY) 444 return (EROFS); 445 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l); 446 } 447 VN_KNOTE(vp, NOTE_ATTRIB); 448 return (error); 449 } 450 451 /* 452 * Change the mode on a file. 453 * Inode must be locked before calling. 454 */ 455 static int 456 ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l) 457 { 458 struct inode *ip = VTOI(vp); 459 int error; 460 461 error = genfs_can_chmod(vp, cred, ip->i_uid, ip->i_gid, mode); 462 if (error) 463 return (error); 464 465 ip->i_e2fs_mode &= ~ALLPERMS; 466 ip->i_e2fs_mode |= (mode & ALLPERMS); 467 ip->i_flag |= IN_CHANGE; 468 return (0); 469 } 470 471 /* 472 * Perform chown operation on inode ip; 473 * inode must be locked prior to call. 474 */ 475 static int 476 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 477 struct lwp *l) 478 { 479 struct inode *ip = VTOI(vp); 480 uid_t ouid; 481 gid_t ogid; 482 int error; 483 484 if (uid == (uid_t)VNOVAL) 485 uid = ip->i_uid; 486 if (gid == (gid_t)VNOVAL) 487 gid = ip->i_gid; 488 489 error = genfs_can_chown(vp, cred, ip->i_uid, ip->i_gid, uid, gid); 490 if (error) 491 return (error); 492 493 ogid = ip->i_gid; 494 ouid = ip->i_uid; 495 496 ip->i_e2fs_gid = gid & 0xffff; 497 ip->i_e2fs_uid = uid & 0xffff; 498 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 499 ip->i_e2fs_gid_high = (gid >> 16) & 0xffff; 500 ip->i_e2fs_uid_high = (uid >> 16) & 0xffff; 501 } else { 502 ip->i_e2fs_gid_high = 0; 503 ip->i_e2fs_uid_high = 0; 504 } 505 if (ouid != uid || ogid != gid) { 506 ext2fs_set_inode_guid(ip); 507 ip->i_flag |= IN_CHANGE; 508 } 509 if (ouid != uid && kauth_authorize_generic(cred, 510 KAUTH_GENERIC_ISSUSER, NULL) != 0) 511 ip->i_e2fs_mode &= ~ISUID; 512 if (ogid != gid && kauth_authorize_generic(cred, 513 KAUTH_GENERIC_ISSUSER, NULL) != 0) 514 ip->i_e2fs_mode &= ~ISGID; 515 return (0); 516 } 517 518 int 519 ext2fs_remove(void *v) 520 { 521 struct vop_remove_args /* { 522 struct vnode *a_dvp; 523 struct vnode *a_vp; 524 struct componentname *a_cnp; 525 } */ *ap = v; 526 struct inode *ip; 527 struct vnode *vp = ap->a_vp; 528 struct vnode *dvp = ap->a_dvp; 529 struct ufs_lookup_results *ulr; 530 int error; 531 532 /* XXX should handle this material another way */ 533 ulr = &VTOI(dvp)->i_crap; 534 UFS_CHECK_CRAPCOUNTER(VTOI(dvp)); 535 536 ip = VTOI(vp); 537 if (vp->v_type == VDIR || 538 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 539 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 540 error = EPERM; 541 } else { 542 error = ext2fs_dirremove(dvp, ulr, ap->a_cnp); 543 if (error == 0) { 544 ip->i_e2fs_nlink--; 545 ip->i_flag |= IN_CHANGE; 546 } 547 } 548 549 VN_KNOTE(vp, NOTE_DELETE); 550 VN_KNOTE(dvp, NOTE_WRITE); 551 if (dvp == vp) 552 vrele(vp); 553 else 554 vput(vp); 555 vput(dvp); 556 return (error); 557 } 558 559 /* 560 * ext2fs_link: create hard link. 561 */ 562 int 563 ext2fs_link(void *v) 564 { 565 struct vop_link_args /* { 566 struct vnode *a_dvp; 567 struct vnode *a_vp; 568 struct componentname *a_cnp; 569 } */ *ap = v; 570 struct vnode *dvp = ap->a_dvp; 571 struct vnode *vp = ap->a_vp; 572 struct componentname *cnp = ap->a_cnp; 573 struct inode *ip; 574 int error; 575 struct ufs_lookup_results *ulr; 576 577 KASSERT(dvp != vp); 578 KASSERT(vp->v_type != VDIR); 579 KASSERT(dvp->v_mount == vp->v_mount); 580 581 /* XXX should handle this material another way */ 582 ulr = &VTOI(dvp)->i_crap; 583 UFS_CHECK_CRAPCOUNTER(VTOI(dvp)); 584 585 error = vn_lock(vp, LK_EXCLUSIVE); 586 if (error) { 587 VOP_ABORTOP(dvp, cnp); 588 goto out2; 589 } 590 ip = VTOI(vp); 591 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 592 VOP_ABORTOP(dvp, cnp); 593 error = EMLINK; 594 goto out1; 595 } 596 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 597 VOP_ABORTOP(dvp, cnp); 598 error = EPERM; 599 goto out1; 600 } 601 ip->i_e2fs_nlink++; 602 ip->i_flag |= IN_CHANGE; 603 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 604 if (!error) 605 error = ext2fs_direnter(ip, dvp, ulr, cnp); 606 if (error) { 607 ip->i_e2fs_nlink--; 608 ip->i_flag |= IN_CHANGE; 609 } 610 out1: 611 VOP_UNLOCK(vp); 612 out2: 613 VN_KNOTE(vp, NOTE_LINK); 614 VN_KNOTE(dvp, NOTE_WRITE); 615 vput(dvp); 616 return (error); 617 } 618 619 /* 620 * Rename system call. 621 * rename("foo", "bar"); 622 * is essentially 623 * unlink("bar"); 624 * link("foo", "bar"); 625 * unlink("foo"); 626 * but ``atomically''. Can't do full commit without saving state in the 627 * inode on disk which isn't feasible at this time. Best we can do is 628 * always guarantee the target exists. 629 * 630 * Basic algorithm is: 631 * 632 * 1) Bump link count on source while we're linking it to the 633 * target. This also ensure the inode won't be deleted out 634 * from underneath us while we work (it may be truncated by 635 * a concurrent `trunc' or `open' for creation). 636 * 2) Link source to destination. If destination already exists, 637 * delete it first. 638 * 3) Unlink source reference to inode if still around. If a 639 * directory was moved and the parent of the destination 640 * is different from the source, patch the ".." entry in the 641 * directory. 642 */ 643 int 644 ext2fs_rename(void *v) 645 { 646 struct vop_rename_args /* { 647 struct vnode *a_fdvp; 648 struct vnode *a_fvp; 649 struct componentname *a_fcnp; 650 struct vnode *a_tdvp; 651 struct vnode *a_tvp; 652 struct componentname *a_tcnp; 653 } */ *ap = v; 654 struct vnode *tvp = ap->a_tvp; 655 struct vnode *tdvp = ap->a_tdvp; 656 struct vnode *fvp = ap->a_fvp; 657 struct vnode *fdvp = ap->a_fdvp; 658 struct componentname *tcnp = ap->a_tcnp; 659 struct componentname *fcnp = ap->a_fcnp; 660 struct inode *ip, *xp, *dp; 661 struct ext2fs_dirtemplate dirbuf; 662 int doingdirectory = 0, oldparent = 0, newparent = 0; 663 int error = 0; 664 u_char namlen; 665 666 /* 667 * Check for cross-device rename. 668 */ 669 if ((fvp->v_mount != tdvp->v_mount) || 670 (tvp && (fvp->v_mount != tvp->v_mount))) { 671 error = EXDEV; 672 abortit: 673 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 674 if (tdvp == tvp) 675 vrele(tdvp); 676 else 677 vput(tdvp); 678 if (tvp) 679 vput(tvp); 680 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 681 vrele(fdvp); 682 vrele(fvp); 683 return (error); 684 } 685 686 /* 687 * Check if just deleting a link name. 688 */ 689 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 690 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 691 error = EPERM; 692 goto abortit; 693 } 694 if (fvp == tvp) { 695 if (fvp->v_type == VDIR) { 696 error = EINVAL; 697 goto abortit; 698 } 699 700 /* Release destination completely. */ 701 VOP_ABORTOP(tdvp, tcnp); 702 vput(tdvp); 703 vput(tvp); 704 705 /* Delete source. */ 706 vrele(fvp); 707 fcnp->cn_flags &= ~(MODMASK); 708 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 709 fcnp->cn_nameiop = DELETE; 710 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 711 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 712 vput(fdvp); 713 return (error); 714 } 715 return (VOP_REMOVE(fdvp, fvp, fcnp)); 716 } 717 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 718 goto abortit; 719 dp = VTOI(fdvp); 720 ip = VTOI(fvp); 721 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 722 VOP_UNLOCK(fvp); 723 error = EMLINK; 724 goto abortit; 725 } 726 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 727 (dp->i_e2fs_flags & EXT2_APPEND)) { 728 VOP_UNLOCK(fvp); 729 error = EPERM; 730 goto abortit; 731 } 732 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 733 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 734 if (!error && tvp) 735 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred); 736 if (error) { 737 VOP_UNLOCK(fvp); 738 error = EACCES; 739 goto abortit; 740 } 741 /* 742 * Avoid ".", "..", and aliases of "." for obvious reasons. 743 */ 744 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 745 dp == ip || 746 (fcnp->cn_flags & ISDOTDOT) || 747 (tcnp->cn_flags & ISDOTDOT) || 748 (ip->i_flag & IN_RENAME)) { 749 VOP_UNLOCK(fvp); 750 error = EINVAL; 751 goto abortit; 752 } 753 ip->i_flag |= IN_RENAME; 754 oldparent = dp->i_number; 755 doingdirectory = 1; 756 } 757 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 758 759 /* 760 * When the target exists, both the directory 761 * and target vnodes are returned locked. 762 */ 763 dp = VTOI(tdvp); 764 xp = NULL; 765 if (tvp) 766 xp = VTOI(tvp); 767 768 /* 769 * 1) Bump link count while we're moving stuff 770 * around. If we crash somewhere before 771 * completing our work, the link count 772 * may be wrong, but correctable. 773 */ 774 ip->i_e2fs_nlink++; 775 ip->i_flag |= IN_CHANGE; 776 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 777 VOP_UNLOCK(fvp); 778 goto bad; 779 } 780 781 /* 782 * If ".." must be changed (ie the directory gets a new 783 * parent) then the source directory must not be in the 784 * directory hierarchy above the target, as this would 785 * orphan everything below the source directory. Also 786 * the user must have write permission in the source so 787 * as to be able to change "..". We must repeat the call 788 * to namei, as the parent directory is unlocked by the 789 * call to checkpath(). 790 */ 791 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 792 VOP_UNLOCK(fvp); 793 if (oldparent != dp->i_number) 794 newparent = dp->i_number; 795 if (doingdirectory && newparent) { 796 if (error) /* write access check above */ 797 goto bad; 798 if (xp != NULL) 799 vput(tvp); 800 vref(tdvp); /* compensate for the ref checkpath loses */ 801 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 802 if (error != 0) { 803 vrele(tdvp); 804 goto out; 805 } 806 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 807 if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { 808 vput(tdvp); 809 goto out; 810 } 811 dp = VTOI(tdvp); 812 xp = NULL; 813 if (tvp) 814 xp = VTOI(tvp); 815 } 816 /* 817 * 2) If target doesn't exist, link the target 818 * to the source and unlink the source. 819 * Otherwise, rewrite the target directory 820 * entry to reference the source inode and 821 * expunge the original entry's existence. 822 */ 823 if (xp == NULL) { 824 if (dp->i_dev != ip->i_dev) 825 panic("rename: EXDEV"); 826 /* 827 * Account for ".." in new directory. 828 * When source and destination have the same 829 * parent we don't fool with the link count. 830 */ 831 if (doingdirectory && newparent) { 832 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 833 error = EMLINK; 834 goto bad; 835 } 836 dp->i_e2fs_nlink++; 837 dp->i_flag |= IN_CHANGE; 838 if ((error = ext2fs_update(tdvp, NULL, NULL, 839 UPDATE_WAIT)) != 0) 840 goto bad; 841 } 842 error = ext2fs_direnter(ip, tdvp, &VTOI(tdvp)->i_crap, tcnp); 843 if (error != 0) { 844 if (doingdirectory && newparent) { 845 dp->i_e2fs_nlink--; 846 dp->i_flag |= IN_CHANGE; 847 (void)ext2fs_update(tdvp, NULL, NULL, 848 UPDATE_WAIT); 849 } 850 goto bad; 851 } 852 VN_KNOTE(tdvp, NOTE_WRITE); 853 vput(tdvp); 854 } else { 855 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 856 panic("rename: EXDEV"); 857 /* 858 * Short circuit rename(foo, foo). 859 */ 860 if (xp->i_number == ip->i_number) 861 panic("rename: same file"); 862 /* 863 * If the parent directory is "sticky", then the user must 864 * own the parent directory, or the destination of the rename, 865 * otherwise the destination may not be changed (except by 866 * root). This implements append-only directories. 867 */ 868 if ((dp->i_e2fs_mode & S_ISTXT) && 869 kauth_authorize_generic(tcnp->cn_cred, 870 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 871 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_uid && 872 xp->i_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 873 error = EPERM; 874 goto bad; 875 } 876 /* 877 * Target must be empty if a directory and have no links 878 * to it. Also, ensure source and target are compatible 879 * (both directories, or both not directories). 880 */ 881 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 882 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 883 xp->i_e2fs_nlink > 2) { 884 error = ENOTEMPTY; 885 goto bad; 886 } 887 if (!doingdirectory) { 888 error = ENOTDIR; 889 goto bad; 890 } 891 cache_purge(tdvp); 892 } else if (doingdirectory) { 893 error = EISDIR; 894 goto bad; 895 } 896 error = ext2fs_dirrewrite(dp, &dp->i_crap, ip, tcnp); 897 if (error != 0) 898 goto bad; 899 /* 900 * If the target directory is in the same 901 * directory as the source directory, 902 * decrement the link count on the parent 903 * of the target directory. 904 */ 905 if (doingdirectory && !newparent) { 906 dp->i_e2fs_nlink--; 907 dp->i_flag |= IN_CHANGE; 908 } 909 /* 910 * Adjust the link count of the target to 911 * reflect the dirrewrite above. If this is 912 * a directory it is empty and there are 913 * no links to it, so we can squash the inode and 914 * any space associated with it. We disallowed 915 * renaming over top of a directory with links to 916 * it above, as the remaining link would point to 917 * a directory without "." or ".." entries. 918 */ 919 xp->i_e2fs_nlink--; 920 if (doingdirectory) { 921 if (--xp->i_e2fs_nlink != 0) 922 panic("rename: linked directory"); 923 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 924 tcnp->cn_cred); 925 } 926 xp->i_flag |= IN_CHANGE; 927 VN_KNOTE(tdvp, NOTE_WRITE); 928 vput(tdvp); 929 VN_KNOTE(tvp, NOTE_DELETE); 930 vput(tvp); 931 xp = NULL; 932 } 933 934 /* 935 * 3) Unlink the source. 936 */ 937 fcnp->cn_flags &= ~(MODMASK); 938 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 939 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 940 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 941 vput(fdvp); 942 vrele(ap->a_fvp); 943 return (error); 944 } 945 if (fvp != NULL) { 946 xp = VTOI(fvp); 947 dp = VTOI(fdvp); 948 } else { 949 /* 950 * From name has disappeared. 951 */ 952 if (doingdirectory) 953 panic("ext2fs_rename: lost dir entry"); 954 vrele(ap->a_fvp); 955 return (0); 956 } 957 /* 958 * Ensure that the directory entry still exists and has not 959 * changed while the new name has been entered. If the source is 960 * a file then the entry may have been unlinked or renamed. In 961 * either case there is no further work to be done. If the source 962 * is a directory then it cannot have been rmdir'ed; its link 963 * count of three would cause a rmdir to fail with ENOTEMPTY. 964 * The IRENAME flag ensures that it cannot be moved by another 965 * rename. 966 */ 967 if (xp != ip) { 968 if (doingdirectory) 969 panic("ext2fs_rename: lost dir entry"); 970 } else { 971 /* 972 * If the source is a directory with a 973 * new parent, the link count of the old 974 * parent directory must be decremented 975 * and ".." set to point to the new parent. 976 */ 977 if (doingdirectory && newparent) { 978 KASSERT(dp != NULL); 979 dp->i_e2fs_nlink--; 980 dp->i_flag |= IN_CHANGE; 981 error = vn_rdwr(UIO_READ, fvp, (void *)&dirbuf, 982 sizeof (struct ext2fs_dirtemplate), (off_t)0, 983 UIO_SYSSPACE, IO_NODELOCKED, 984 tcnp->cn_cred, (size_t *)0, NULL); 985 if (error == 0) { 986 namlen = dirbuf.dotdot_namlen; 987 if (namlen != 2 || 988 dirbuf.dotdot_name[0] != '.' || 989 dirbuf.dotdot_name[1] != '.') { 990 ufs_dirbad(xp, (doff_t)12, 991 "ext2fs_rename: mangled dir"); 992 } else { 993 dirbuf.dotdot_ino = h2fs32(newparent); 994 (void) vn_rdwr(UIO_WRITE, fvp, 995 (void *)&dirbuf, 996 sizeof (struct dirtemplate), 997 (off_t)0, UIO_SYSSPACE, 998 IO_NODELOCKED|IO_SYNC, 999 tcnp->cn_cred, (size_t *)0, 1000 NULL); 1001 cache_purge(fdvp); 1002 } 1003 } 1004 } 1005 error = ext2fs_dirremove(fdvp, &VTOI(fdvp)->i_crap, fcnp); 1006 if (!error) { 1007 xp->i_e2fs_nlink--; 1008 xp->i_flag |= IN_CHANGE; 1009 } 1010 xp->i_flag &= ~IN_RENAME; 1011 } 1012 VN_KNOTE(fvp, NOTE_RENAME); 1013 if (dp) 1014 vput(fdvp); 1015 if (xp) 1016 vput(fvp); 1017 vrele(ap->a_fvp); 1018 return (error); 1019 1020 bad: 1021 if (xp) 1022 vput(ITOV(xp)); 1023 vput(ITOV(dp)); 1024 out: 1025 if (doingdirectory) 1026 ip->i_flag &= ~IN_RENAME; 1027 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1028 ip->i_e2fs_nlink--; 1029 ip->i_flag |= IN_CHANGE; 1030 vput(fvp); 1031 } else 1032 vrele(fvp); 1033 vrele(fdvp); 1034 return (error); 1035 } 1036 1037 /* 1038 * Mkdir system call 1039 */ 1040 int 1041 ext2fs_mkdir(void *v) 1042 { 1043 struct vop_mkdir_args /* { 1044 struct vnode *a_dvp; 1045 struct vnode **a_vpp; 1046 struct componentname *a_cnp; 1047 struct vattr *a_vap; 1048 } */ *ap = v; 1049 struct vnode *dvp = ap->a_dvp; 1050 struct vattr *vap = ap->a_vap; 1051 struct componentname *cnp = ap->a_cnp; 1052 struct inode *ip, *dp = VTOI(dvp); 1053 struct vnode *tvp; 1054 struct ext2fs_dirtemplate dirtemplate; 1055 int error, dmode; 1056 struct ufs_lookup_results *ulr; 1057 1058 /* XXX should handle this material another way */ 1059 ulr = &VTOI(dvp)->i_crap; 1060 UFS_CHECK_CRAPCOUNTER(VTOI(dvp)); 1061 1062 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1063 error = EMLINK; 1064 goto out; 1065 } 1066 dmode = vap->va_mode & ACCESSPERMS; 1067 dmode |= IFDIR; 1068 /* 1069 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1070 * but not have it entered in the parent directory. The entry is 1071 * made later after writing "." and ".." entries. 1072 */ 1073 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1074 goto out; 1075 ip = VTOI(tvp); 1076 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1077 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1078 ip->i_e2fs_gid = dp->i_e2fs_gid; 1079 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1080 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1081 ip->i_e2fs_gid_high = dp->i_e2fs_gid_high; 1082 } else { 1083 ip->i_e2fs_uid_high = 0; 1084 ip->i_e2fs_gid_high = 0; 1085 } 1086 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1087 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1088 ip->i_e2fs_mode = dmode; 1089 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1090 ip->i_e2fs_nlink = 2; 1091 1092 /* 1093 * Bump link count in parent directory 1094 * to reflect work done below. Should 1095 * be done before reference is created 1096 * so reparation is possible if we crash. 1097 */ 1098 dp->i_e2fs_nlink++; 1099 dp->i_flag |= IN_CHANGE; 1100 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1101 goto bad; 1102 1103 /* Initialize directory with "." and ".." from static template. */ 1104 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1105 dirtemplate.dot_ino = h2fs32(ip->i_number); 1106 dirtemplate.dot_reclen = h2fs16(12); 1107 dirtemplate.dot_namlen = 1; 1108 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1109 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1110 dirtemplate.dot_type = EXT2_FT_DIR; 1111 } 1112 dirtemplate.dot_name[0] = '.'; 1113 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1114 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1115 dirtemplate.dotdot_namlen = 2; 1116 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1117 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1118 dirtemplate.dotdot_type = EXT2_FT_DIR; 1119 } 1120 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1121 error = vn_rdwr(UIO_WRITE, tvp, (void *)&dirtemplate, 1122 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1123 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1124 if (error) { 1125 dp->i_e2fs_nlink--; 1126 dp->i_flag |= IN_CHANGE; 1127 goto bad; 1128 } 1129 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1130 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1131 else { 1132 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1133 if (error) { 1134 dp->i_e2fs_nlink--; 1135 dp->i_flag |= IN_CHANGE; 1136 goto bad; 1137 } 1138 ip->i_flag |= IN_CHANGE; 1139 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1140 } 1141 1142 /* Directory set up, now install it's entry in the parent directory. */ 1143 error = ext2fs_direnter(ip, dvp, ulr, cnp); 1144 if (error != 0) { 1145 dp->i_e2fs_nlink--; 1146 dp->i_flag |= IN_CHANGE; 1147 } 1148 bad: 1149 /* 1150 * No need to do an explicit ext2fs_truncate here, vrele will do this 1151 * for us because we set the link count to 0. 1152 */ 1153 if (error) { 1154 ip->i_e2fs_nlink = 0; 1155 ip->i_flag |= IN_CHANGE; 1156 vput(tvp); 1157 } else { 1158 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1159 *ap->a_vpp = tvp; 1160 } 1161 out: 1162 vput(dvp); 1163 return (error); 1164 } 1165 1166 /* 1167 * Rmdir system call. 1168 */ 1169 int 1170 ext2fs_rmdir(void *v) 1171 { 1172 struct vop_rmdir_args /* { 1173 struct vnode *a_dvp; 1174 struct vnode *a_vp; 1175 struct componentname *a_cnp; 1176 } */ *ap = v; 1177 struct vnode *vp = ap->a_vp; 1178 struct vnode *dvp = ap->a_dvp; 1179 struct componentname *cnp = ap->a_cnp; 1180 struct inode *ip, *dp; 1181 int error; 1182 struct ufs_lookup_results *ulr; 1183 1184 ip = VTOI(vp); 1185 dp = VTOI(dvp); 1186 1187 /* XXX should handle this material another way */ 1188 ulr = &dp->i_crap; 1189 UFS_CHECK_CRAPCOUNTER(dp); 1190 1191 /* 1192 * No rmdir "." please. 1193 */ 1194 if (dp == ip) { 1195 vrele(dvp); 1196 vput(vp); 1197 return (EINVAL); 1198 } 1199 /* 1200 * Verify the directory is empty (and valid). 1201 * (Rmdir ".." won't be valid since 1202 * ".." will contain a reference to 1203 * the current directory and thus be 1204 * non-empty.) 1205 */ 1206 error = 0; 1207 if (ip->i_e2fs_nlink != 2 || 1208 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1209 error = ENOTEMPTY; 1210 goto out; 1211 } 1212 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1213 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1214 error = EPERM; 1215 goto out; 1216 } 1217 /* 1218 * Delete reference to directory before purging 1219 * inode. If we crash in between, the directory 1220 * will be reattached to lost+found, 1221 */ 1222 error = ext2fs_dirremove(dvp, ulr, cnp); 1223 if (error != 0) 1224 goto out; 1225 dp->i_e2fs_nlink--; 1226 dp->i_flag |= IN_CHANGE; 1227 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1228 cache_purge(dvp); 1229 vput(dvp); 1230 dvp = NULL; 1231 /* 1232 * Truncate inode. The only stuff left 1233 * in the directory is "." and "..". The 1234 * "." reference is inconsequential since 1235 * we're quashing it. The ".." reference 1236 * has already been adjusted above. We've 1237 * removed the "." reference and the reference 1238 * in the parent directory, but there may be 1239 * other hard links so decrement by 2 and 1240 * worry about them later. 1241 */ 1242 ip->i_e2fs_nlink -= 2; 1243 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred); 1244 cache_purge(ITOV(ip)); 1245 out: 1246 VN_KNOTE(vp, NOTE_DELETE); 1247 if (dvp) 1248 vput(dvp); 1249 vput(vp); 1250 return (error); 1251 } 1252 1253 /* 1254 * symlink -- make a symbolic link 1255 */ 1256 int 1257 ext2fs_symlink(void *v) 1258 { 1259 struct vop_symlink_args /* { 1260 struct vnode *a_dvp; 1261 struct vnode **a_vpp; 1262 struct componentname *a_cnp; 1263 struct vattr *a_vap; 1264 char *a_target; 1265 } */ *ap = v; 1266 struct vnode *vp, **vpp; 1267 struct inode *ip; 1268 int len, error; 1269 1270 vpp = ap->a_vpp; 1271 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1272 vpp, ap->a_cnp); 1273 if (error) 1274 return (error); 1275 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1276 vp = *vpp; 1277 len = strlen(ap->a_target); 1278 ip = VTOI(vp); 1279 if (len < ip->i_ump->um_maxsymlinklen) { 1280 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1281 error = ext2fs_setsize(ip, len); 1282 if (error) 1283 goto bad; 1284 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1285 uvm_vnp_setsize(vp, len); 1286 } else 1287 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1288 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1289 (size_t *)0, NULL); 1290 bad: 1291 if (error) 1292 vput(vp); 1293 return (error); 1294 } 1295 1296 /* 1297 * Return target name of a symbolic link 1298 */ 1299 int 1300 ext2fs_readlink(void *v) 1301 { 1302 struct vop_readlink_args /* { 1303 struct vnode *a_vp; 1304 struct uio *a_uio; 1305 kauth_cred_t a_cred; 1306 } */ *ap = v; 1307 struct vnode *vp = ap->a_vp; 1308 struct inode *ip = VTOI(vp); 1309 struct ufsmount *ump = ip->i_ump; 1310 int isize; 1311 1312 isize = ext2fs_size(ip); 1313 if (isize < ump->um_maxsymlinklen || 1314 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1315 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1316 return (0); 1317 } 1318 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1319 } 1320 1321 /* 1322 * Advisory record locking support 1323 */ 1324 int 1325 ext2fs_advlock(void *v) 1326 { 1327 struct vop_advlock_args /* { 1328 struct vnode *a_vp; 1329 void * a_id; 1330 int a_op; 1331 struct flock *a_fl; 1332 int a_flags; 1333 } */ *ap = v; 1334 struct inode *ip = VTOI(ap->a_vp); 1335 1336 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1337 } 1338 1339 int 1340 ext2fs_fsync(void *v) 1341 { 1342 struct vop_fsync_args /* { 1343 struct vnode *a_vp; 1344 kauth_cred_t a_cred; 1345 int a_flags; 1346 off_t offlo; 1347 off_t offhi; 1348 struct proc *a_p; 1349 } */ *ap = v; 1350 struct vnode *vp = ap->a_vp; 1351 int wait; 1352 int error; 1353 1354 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1355 1356 if (vp->v_type == VBLK) 1357 error = spec_fsync(v); 1358 else 1359 error = vflushbuf(vp, wait); 1360 if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) 1361 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1362 1363 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1364 int l = 0; 1365 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1366 curlwp->l_cred); 1367 } 1368 1369 return error; 1370 } 1371 1372 /* 1373 * Initialize the vnode associated with a new inode, handle aliased 1374 * vnodes. 1375 */ 1376 int 1377 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1378 int (**fifoops)(void *), struct vnode **vpp) 1379 { 1380 struct timeval tv; 1381 struct inode *ip; 1382 struct vnode *vp; 1383 1384 vp = *vpp; 1385 ip = VTOI(vp); 1386 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1387 case VCHR: 1388 case VBLK: 1389 vp->v_op = specops; 1390 spec_node_init(vp, fs2h32(ip->i_din.e2fs_din->e2di_rdev)); 1391 break; 1392 case VFIFO: 1393 vp->v_op = fifoops; 1394 break; 1395 case VNON: 1396 case VBAD: 1397 case VSOCK: 1398 case VLNK: 1399 case VDIR: 1400 case VREG: 1401 break; 1402 } 1403 if (ip->i_number == ROOTINO) 1404 vp->v_vflag |= VV_ROOT; 1405 /* 1406 * Initialize modrev times 1407 */ 1408 getmicrouptime(&tv); 1409 SETHIGH(ip->i_modrev, tv.tv_sec); 1410 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1411 *vpp = vp; 1412 return (0); 1413 } 1414 1415 /* 1416 * Allocate a new inode. 1417 */ 1418 int 1419 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1420 struct componentname *cnp) 1421 { 1422 struct inode *ip, *pdir; 1423 struct vnode *tvp; 1424 int error, ismember = 0; 1425 struct ufs_lookup_results *ulr; 1426 1427 pdir = VTOI(dvp); 1428 1429 /* XXX should handle this material another way */ 1430 ulr = &pdir->i_crap; 1431 UFS_CHECK_CRAPCOUNTER(pdir); 1432 1433 *vpp = NULL; 1434 if ((mode & IFMT) == 0) 1435 mode |= IFREG; 1436 1437 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1438 vput(dvp); 1439 return (error); 1440 } 1441 ip = VTOI(tvp); 1442 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1443 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1444 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1445 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1446 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1447 ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high; 1448 } else { 1449 ip->i_e2fs_uid_high = 0; 1450 ip->i_e2fs_gid_high = 0; 1451 } 1452 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1453 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1454 ip->i_e2fs_mode = mode; 1455 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1456 ip->i_e2fs_nlink = 1; 1457 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1458 ip->i_gid, &ismember) != 0 || !ismember) && 1459 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1460 ip->i_e2fs_mode &= ~ISGID; 1461 1462 /* 1463 * Make sure inode goes to disk before directory entry. 1464 */ 1465 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1466 goto bad; 1467 error = ext2fs_direnter(ip, dvp, ulr, cnp); 1468 if (error != 0) 1469 goto bad; 1470 vput(dvp); 1471 *vpp = tvp; 1472 return (0); 1473 1474 bad: 1475 /* 1476 * Write error occurred trying to update the inode 1477 * or the directory so must deallocate the inode. 1478 */ 1479 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1480 ip->i_e2fs_nlink = 0; 1481 ip->i_flag |= IN_CHANGE; 1482 vput(tvp); 1483 vput(dvp); 1484 return (error); 1485 } 1486 1487 /* 1488 * Reclaim an inode so that it can be used for other purposes. 1489 */ 1490 int 1491 ext2fs_reclaim(void *v) 1492 { 1493 struct vop_reclaim_args /* { 1494 struct vnode *a_vp; 1495 } */ *ap = v; 1496 struct vnode *vp = ap->a_vp; 1497 struct inode *ip = VTOI(vp); 1498 int error; 1499 1500 /* 1501 * The inode must be freed and updated before being removed 1502 * from its hash chain. Other threads trying to gain a hold 1503 * on the inode will be stalled because it is locked (VI_XLOCK). 1504 */ 1505 if (ip->i_omode == 1 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1506 ext2fs_vfree(vp, ip->i_number, ip->i_e2fs_mode); 1507 if ((error = ufs_reclaim(vp)) != 0) 1508 return (error); 1509 if (ip->i_din.e2fs_din != NULL) 1510 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1511 genfs_node_destroy(vp); 1512 pool_put(&ext2fs_inode_pool, vp->v_data); 1513 vp->v_data = NULL; 1514 return (0); 1515 } 1516 1517 /* Global vfs data structures for ext2fs. */ 1518 int (**ext2fs_vnodeop_p)(void *); 1519 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1520 { &vop_default_desc, vn_default_error }, 1521 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1522 { &vop_create_desc, ext2fs_create }, /* create */ 1523 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1524 { &vop_open_desc, ext2fs_open }, /* open */ 1525 { &vop_close_desc, ufs_close }, /* close */ 1526 { &vop_access_desc, ext2fs_access }, /* access */ 1527 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1528 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1529 { &vop_read_desc, ext2fs_read }, /* read */ 1530 { &vop_write_desc, ext2fs_write }, /* write */ 1531 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1532 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1533 { &vop_poll_desc, ufs_poll }, /* poll */ 1534 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1535 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1536 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1537 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1538 { &vop_seek_desc, ufs_seek }, /* seek */ 1539 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1540 { &vop_link_desc, ext2fs_link }, /* link */ 1541 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1542 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1543 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1544 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1545 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1546 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1547 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1548 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1549 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1550 { &vop_lock_desc, ufs_lock }, /* lock */ 1551 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1552 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1553 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1554 { &vop_print_desc, ufs_print }, /* print */ 1555 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1556 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1557 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1558 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1559 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1560 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1561 { NULL, NULL } 1562 }; 1563 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1564 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1565 1566 int (**ext2fs_specop_p)(void *); 1567 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1568 { &vop_default_desc, vn_default_error }, 1569 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1570 { &vop_create_desc, spec_create }, /* create */ 1571 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1572 { &vop_open_desc, spec_open }, /* open */ 1573 { &vop_close_desc, ufsspec_close }, /* close */ 1574 { &vop_access_desc, ext2fs_access }, /* access */ 1575 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1576 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1577 { &vop_read_desc, ufsspec_read }, /* read */ 1578 { &vop_write_desc, ufsspec_write }, /* write */ 1579 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1580 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1581 { &vop_poll_desc, spec_poll }, /* poll */ 1582 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1583 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1584 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1585 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1586 { &vop_seek_desc, spec_seek }, /* seek */ 1587 { &vop_remove_desc, spec_remove }, /* remove */ 1588 { &vop_link_desc, spec_link }, /* link */ 1589 { &vop_rename_desc, spec_rename }, /* rename */ 1590 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1591 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1592 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1593 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1594 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1595 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1596 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1597 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1598 { &vop_lock_desc, ufs_lock }, /* lock */ 1599 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1600 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1601 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1602 { &vop_print_desc, ufs_print }, /* print */ 1603 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1604 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1605 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1606 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1607 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1608 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1609 { NULL, NULL } 1610 }; 1611 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1612 { &ext2fs_specop_p, ext2fs_specop_entries }; 1613 1614 int (**ext2fs_fifoop_p)(void *); 1615 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1616 { &vop_default_desc, vn_default_error }, 1617 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 1618 { &vop_create_desc, vn_fifo_bypass }, /* create */ 1619 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 1620 { &vop_open_desc, vn_fifo_bypass }, /* open */ 1621 { &vop_close_desc, ufsfifo_close }, /* close */ 1622 { &vop_access_desc, ext2fs_access }, /* access */ 1623 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1624 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1625 { &vop_read_desc, ufsfifo_read }, /* read */ 1626 { &vop_write_desc, ufsfifo_write }, /* write */ 1627 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 1628 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1629 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 1630 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 1631 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 1632 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 1633 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1634 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 1635 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 1636 { &vop_link_desc, vn_fifo_bypass }, /* link */ 1637 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 1638 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 1639 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 1640 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 1641 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 1642 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 1643 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 1644 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1645 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1646 { &vop_lock_desc, ufs_lock }, /* lock */ 1647 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1648 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 1649 { &vop_strategy_desc, vn_fifo_bypass }, /* strategy */ 1650 { &vop_print_desc, ufs_print }, /* print */ 1651 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1652 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 1653 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 1654 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1655 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 1656 { NULL, NULL } 1657 }; 1658 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1659 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1660