1 /* $NetBSD: ext2fs_vnops.c,v 1.77 2007/12/08 19:29:54 pooka 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 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by Manuel Bouyer. 54 * 4. The name of the author may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 61 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 62 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 63 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 64 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 65 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 66 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 * 68 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94 69 * Modified for ext2fs by Manuel Bouyer. 70 */ 71 72 #include <sys/cdefs.h> 73 __KERNEL_RCSID(0, "$NetBSD: ext2fs_vnops.c,v 1.77 2007/12/08 19:29:54 pooka Exp $"); 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/resourcevar.h> 78 #include <sys/kernel.h> 79 #include <sys/file.h> 80 #include <sys/stat.h> 81 #include <sys/buf.h> 82 #include <sys/proc.h> 83 #include <sys/mount.h> 84 #include <sys/namei.h> 85 #include <sys/vnode.h> 86 #include <sys/lockf.h> 87 #include <sys/malloc.h> 88 #include <sys/pool.h> 89 #include <sys/signalvar.h> 90 #include <sys/kauth.h> 91 92 #include <miscfs/fifofs/fifo.h> 93 #include <miscfs/genfs/genfs.h> 94 #include <miscfs/specfs/specdev.h> 95 96 #include <ufs/ufs/inode.h> 97 #include <ufs/ufs/ufs_extern.h> 98 #include <ufs/ufs/ufsmount.h> 99 100 #include <ufs/ext2fs/ext2fs.h> 101 #include <ufs/ext2fs/ext2fs_extern.h> 102 #include <ufs/ext2fs/ext2fs_dir.h> 103 104 extern int prtactive; 105 106 static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *); 107 static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 108 struct lwp *); 109 110 union _qcvt { 111 int64_t qcvt; 112 int32_t val[2]; 113 }; 114 115 #define SETHIGH(q, h) { \ 116 union _qcvt tmp; \ 117 tmp.qcvt = (q); \ 118 tmp.val[_QUAD_HIGHWORD] = (h); \ 119 (q) = tmp.qcvt; \ 120 } 121 #define SETLOW(q, l) { \ 122 union _qcvt tmp; \ 123 tmp.qcvt = (q); \ 124 tmp.val[_QUAD_LOWWORD] = (l); \ 125 (q) = tmp.qcvt; \ 126 } 127 128 /* 129 * Create a regular file 130 */ 131 int 132 ext2fs_create(void *v) 133 { 134 struct vop_create_args /* { 135 struct vnode *a_dvp; 136 struct vnode **a_vpp; 137 struct componentname *a_cnp; 138 struct vattr *a_vap; 139 } */ *ap = v; 140 int error; 141 142 error = 143 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 144 ap->a_dvp, ap->a_vpp, ap->a_cnp); 145 146 if (error) 147 return (error); 148 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 149 return (0); 150 } 151 152 /* 153 * Mknod vnode call 154 */ 155 /* ARGSUSED */ 156 int 157 ext2fs_mknod(void *v) 158 { 159 struct vop_mknod_args /* { 160 struct vnode *a_dvp; 161 struct vnode **a_vpp; 162 struct componentname *a_cnp; 163 struct vattr *a_vap; 164 } */ *ap = v; 165 struct vattr *vap = ap->a_vap; 166 struct vnode **vpp = ap->a_vpp; 167 struct inode *ip; 168 int error; 169 struct mount *mp; 170 ino_t ino; 171 172 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 173 ap->a_dvp, vpp, ap->a_cnp)) != 0) 174 return (error); 175 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 176 ip = VTOI(*vpp); 177 mp = (*vpp)->v_mount; 178 ino = ip->i_number; 179 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 180 if (vap->va_rdev != VNOVAL) { 181 /* 182 * Want to be able to use this to make badblock 183 * inodes, so don't truncate the dev number. 184 */ 185 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 186 } 187 /* 188 * Remove inode so that it will be reloaded by VFS_VGET and 189 * checked to see if it is an alias of an existing entry in 190 * the inode cache. 191 */ 192 vput(*vpp); 193 (*vpp)->v_type = VNON; 194 vgone(*vpp); 195 error = VFS_VGET(mp, ino, vpp); 196 if (error != 0) { 197 *vpp = NULL; 198 return (error); 199 } 200 return (0); 201 } 202 203 /* 204 * Open called. 205 * 206 * Just check the APPEND flag. 207 */ 208 /* ARGSUSED */ 209 int 210 ext2fs_open(void *v) 211 { 212 struct vop_open_args /* { 213 struct vnode *a_vp; 214 int a_mode; 215 kauth_cred_t a_cred; 216 } */ *ap = v; 217 218 /* 219 * Files marked append-only must be opened for appending. 220 */ 221 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 222 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 223 return (EPERM); 224 return (0); 225 } 226 227 int 228 ext2fs_access(void *v) 229 { 230 struct vop_access_args /* { 231 struct vnode *a_vp; 232 int a_mode; 233 kauth_cred_t a_cred; 234 } */ *ap = v; 235 struct vnode *vp = ap->a_vp; 236 struct inode *ip = VTOI(vp); 237 mode_t mode = ap->a_mode; 238 239 /* 240 * Disallow write attempts on read-only file systems; 241 * unless the file is a socket, fifo, or a block or 242 * character device resident on the file system. 243 */ 244 if (mode & VWRITE) { 245 switch (vp->v_type) { 246 case VDIR: 247 case VLNK: 248 case VREG: 249 if (vp->v_mount->mnt_flag & MNT_RDONLY) 250 return (EROFS); 251 break; 252 default: 253 break; 254 } 255 } 256 257 /* If immutable bit set, nobody gets to write it. */ 258 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 259 return (EPERM); 260 261 return (vaccess(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 262 ip->i_e2fs_uid, ip->i_e2fs_gid, mode, ap->a_cred)); 263 } 264 265 /* ARGSUSED */ 266 int 267 ext2fs_getattr(void *v) 268 { 269 struct vop_getattr_args /* { 270 struct vnode *a_vp; 271 struct vattr *a_vap; 272 kauth_cred_t a_cred; 273 } */ *ap = v; 274 struct vnode *vp = ap->a_vp; 275 struct inode *ip = VTOI(vp); 276 struct vattr *vap = ap->a_vap; 277 278 EXT2FS_ITIMES(ip, NULL, NULL, NULL); 279 /* 280 * Copy from inode table 281 */ 282 vap->va_fsid = ip->i_dev; 283 vap->va_fileid = ip->i_number; 284 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 285 vap->va_nlink = ip->i_e2fs_nlink; 286 vap->va_uid = ip->i_e2fs_uid; 287 vap->va_gid = ip->i_e2fs_gid; 288 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 289 vap->va_size = vp->v_size; 290 vap->va_atime.tv_sec = ip->i_e2fs_atime; 291 vap->va_atime.tv_nsec = 0; 292 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 293 vap->va_mtime.tv_nsec = 0; 294 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 295 vap->va_ctime.tv_nsec = 0; 296 #ifdef EXT2FS_SYSTEM_FLAGS 297 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 298 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 299 #else 300 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 301 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 302 #endif 303 vap->va_gen = ip->i_e2fs_gen; 304 /* this doesn't belong here */ 305 if (vp->v_type == VBLK) 306 vap->va_blocksize = BLKDEV_IOSIZE; 307 else if (vp->v_type == VCHR) 308 vap->va_blocksize = MAXBSIZE; 309 else 310 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 311 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 312 vap->va_type = vp->v_type; 313 vap->va_filerev = ip->i_modrev; 314 return (0); 315 } 316 317 /* 318 * Set attribute vnode op. called from several syscalls 319 */ 320 int 321 ext2fs_setattr(void *v) 322 { 323 struct vop_setattr_args /* { 324 struct vnode *a_vp; 325 struct vattr *a_vap; 326 kauth_cred_t a_cred; 327 } */ *ap = v; 328 struct vattr *vap = ap->a_vap; 329 struct vnode *vp = ap->a_vp; 330 struct inode *ip = VTOI(vp); 331 kauth_cred_t cred = ap->a_cred; 332 struct lwp *l = curlwp; 333 int error; 334 335 /* 336 * Check for unsettable attributes. 337 */ 338 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 339 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 340 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 341 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 342 return (EINVAL); 343 } 344 if (vap->va_flags != VNOVAL) { 345 if (vp->v_mount->mnt_flag & MNT_RDONLY) 346 return (EROFS); 347 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 348 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 349 NULL))) 350 return (error); 351 #ifdef EXT2FS_SYSTEM_FLAGS 352 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 353 NULL) == 0) { 354 if ((ip->i_e2fs_flags & 355 (EXT2_APPEND | EXT2_IMMUTABLE)) && 356 kauth_authorize_system(l->l_cred, 357 KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL)) 358 return (EPERM); 359 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 360 ip->i_e2fs_flags |= 361 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 362 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 363 } else 364 return (EPERM); 365 #else 366 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 367 ip->i_e2fs_flags |= 368 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 369 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 370 #endif 371 ip->i_flag |= IN_CHANGE; 372 if (vap->va_flags & (IMMUTABLE | APPEND)) 373 return (0); 374 } 375 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 376 return (EPERM); 377 /* 378 * Go through the fields and update iff not VNOVAL. 379 */ 380 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 381 if (vp->v_mount->mnt_flag & MNT_RDONLY) 382 return (EROFS); 383 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 384 if (error) 385 return (error); 386 } 387 if (vap->va_size != VNOVAL) { 388 /* 389 * Disallow write attempts on read-only file systems; 390 * unless the file is a socket, fifo, or a block or 391 * character device resident on the file system. 392 */ 393 switch (vp->v_type) { 394 case VDIR: 395 return (EISDIR); 396 case VLNK: 397 case VREG: 398 if (vp->v_mount->mnt_flag & MNT_RDONLY) 399 return (EROFS); 400 default: 401 break; 402 } 403 error = ext2fs_truncate(vp, vap->va_size, 0, cred); 404 if (error) 405 return (error); 406 } 407 ip = VTOI(vp); 408 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 409 if (vp->v_mount->mnt_flag & MNT_RDONLY) 410 return (EROFS); 411 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 412 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 413 NULL)) && 414 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 415 (error = VOP_ACCESS(vp, VWRITE, cred)))) 416 return (error); 417 if (vap->va_atime.tv_sec != VNOVAL) 418 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 419 ip->i_flag |= IN_ACCESS; 420 if (vap->va_mtime.tv_sec != VNOVAL) 421 ip->i_flag |= IN_CHANGE | IN_UPDATE; 422 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 423 UPDATE_WAIT); 424 if (error) 425 return (error); 426 } 427 error = 0; 428 if (vap->va_mode != (mode_t)VNOVAL) { 429 if (vp->v_mount->mnt_flag & MNT_RDONLY) 430 return (EROFS); 431 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l); 432 } 433 VN_KNOTE(vp, NOTE_ATTRIB); 434 return (error); 435 } 436 437 /* 438 * Change the mode on a file. 439 * Inode must be locked before calling. 440 */ 441 static int 442 ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l) 443 { 444 struct inode *ip = VTOI(vp); 445 int error, ismember = 0; 446 447 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 448 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 449 NULL))) 450 return (error); 451 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL)) { 452 if (vp->v_type != VDIR && (mode & S_ISTXT)) 453 return (EFTYPE); 454 if ((kauth_cred_ismember_gid(cred, ip->i_e2fs_gid, &ismember) != 0 || 455 !ismember) && (mode & ISGID)) 456 return (EPERM); 457 } 458 ip->i_e2fs_mode &= ~ALLPERMS; 459 ip->i_e2fs_mode |= (mode & ALLPERMS); 460 ip->i_flag |= IN_CHANGE; 461 return (0); 462 } 463 464 /* 465 * Perform chown operation on inode ip; 466 * inode must be locked prior to call. 467 */ 468 static int 469 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 470 struct lwp *l) 471 { 472 struct inode *ip = VTOI(vp); 473 uid_t ouid; 474 gid_t ogid; 475 int error = 0, ismember = 0; 476 477 if (uid == (uid_t)VNOVAL) 478 uid = ip->i_e2fs_uid; 479 if (gid == (gid_t)VNOVAL) 480 gid = ip->i_e2fs_gid; 481 /* 482 * If we don't own the file, are trying to change the owner 483 * of the file, or are not a member of the target group, 484 * the caller must be superuser or the call fails. 485 */ 486 if ((kauth_cred_geteuid(cred) != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 487 (gid != ip->i_e2fs_gid && 488 !(kauth_cred_getegid(cred) == gid || 489 (kauth_cred_ismember_gid(cred, gid, &ismember) == 0 && ismember)))) && 490 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL))) 491 return (error); 492 ogid = ip->i_e2fs_gid; 493 ouid = ip->i_e2fs_uid; 494 495 ip->i_e2fs_gid = gid; 496 ip->i_e2fs_uid = uid; 497 if (ouid != uid || ogid != gid) 498 ip->i_flag |= IN_CHANGE; 499 if (ouid != uid && kauth_authorize_generic(cred, 500 KAUTH_GENERIC_ISSUSER, NULL) != 0) 501 ip->i_e2fs_mode &= ~ISUID; 502 if (ogid != gid && kauth_authorize_generic(cred, 503 KAUTH_GENERIC_ISSUSER, NULL) != 0) 504 ip->i_e2fs_mode &= ~ISGID; 505 return (0); 506 } 507 508 int 509 ext2fs_remove(void *v) 510 { 511 struct vop_remove_args /* { 512 struct vnode *a_dvp; 513 struct vnode *a_vp; 514 struct componentname *a_cnp; 515 } */ *ap = v; 516 struct inode *ip; 517 struct vnode *vp = ap->a_vp; 518 struct vnode *dvp = ap->a_dvp; 519 int error; 520 521 ip = VTOI(vp); 522 if (vp->v_type == VDIR || 523 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 524 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 525 error = EPERM; 526 } else { 527 error = ext2fs_dirremove(dvp, ap->a_cnp); 528 if (error == 0) { 529 ip->i_e2fs_nlink--; 530 ip->i_flag |= IN_CHANGE; 531 } 532 } 533 534 VN_KNOTE(vp, NOTE_DELETE); 535 VN_KNOTE(dvp, NOTE_WRITE); 536 if (dvp == vp) 537 vrele(vp); 538 else 539 vput(vp); 540 vput(dvp); 541 return (error); 542 } 543 544 /* 545 * link vnode call 546 */ 547 int 548 ext2fs_link(void *v) 549 { 550 struct vop_link_args /* { 551 struct vnode *a_dvp; 552 struct vnode *a_vp; 553 struct componentname *a_cnp; 554 } */ *ap = v; 555 struct vnode *dvp = ap->a_dvp; 556 struct vnode *vp = ap->a_vp; 557 struct componentname *cnp = ap->a_cnp; 558 struct inode *ip; 559 int error; 560 561 #ifdef DIAGNOSTIC 562 if ((cnp->cn_flags & HASBUF) == 0) 563 panic("ext2fs_link: no name"); 564 #endif 565 if (vp->v_type == VDIR) { 566 VOP_ABORTOP(dvp, cnp); 567 error = EISDIR; 568 goto out2; 569 } 570 if (dvp->v_mount != vp->v_mount) { 571 VOP_ABORTOP(dvp, cnp); 572 error = EXDEV; 573 goto out2; 574 } 575 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 576 VOP_ABORTOP(dvp, cnp); 577 goto out2; 578 } 579 ip = VTOI(vp); 580 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 581 VOP_ABORTOP(dvp, cnp); 582 error = EMLINK; 583 goto out1; 584 } 585 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 586 VOP_ABORTOP(dvp, cnp); 587 error = EPERM; 588 goto out1; 589 } 590 ip->i_e2fs_nlink++; 591 ip->i_flag |= IN_CHANGE; 592 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 593 if (!error) 594 error = ext2fs_direnter(ip, dvp, cnp); 595 if (error) { 596 ip->i_e2fs_nlink--; 597 ip->i_flag |= IN_CHANGE; 598 } 599 PNBUF_PUT(cnp->cn_pnbuf); 600 out1: 601 if (dvp != vp) 602 VOP_UNLOCK(vp, 0); 603 out2: 604 VN_KNOTE(vp, NOTE_LINK); 605 VN_KNOTE(dvp, NOTE_WRITE); 606 vput(dvp); 607 return (error); 608 } 609 610 /* 611 * Rename system call. 612 * rename("foo", "bar"); 613 * is essentially 614 * unlink("bar"); 615 * link("foo", "bar"); 616 * unlink("foo"); 617 * but ``atomically''. Can't do full commit without saving state in the 618 * inode on disk which isn't feasible at this time. Best we can do is 619 * always guarantee the target exists. 620 * 621 * Basic algorithm is: 622 * 623 * 1) Bump link count on source while we're linking it to the 624 * target. This also ensure the inode won't be deleted out 625 * from underneath us while we work (it may be truncated by 626 * a concurrent `trunc' or `open' for creation). 627 * 2) Link source to destination. If destination already exists, 628 * delete it first. 629 * 3) Unlink source reference to inode if still around. If a 630 * directory was moved and the parent of the destination 631 * is different from the source, patch the ".." entry in the 632 * directory. 633 */ 634 int 635 ext2fs_rename(void *v) 636 { 637 struct vop_rename_args /* { 638 struct vnode *a_fdvp; 639 struct vnode *a_fvp; 640 struct componentname *a_fcnp; 641 struct vnode *a_tdvp; 642 struct vnode *a_tvp; 643 struct componentname *a_tcnp; 644 } */ *ap = v; 645 struct vnode *tvp = ap->a_tvp; 646 struct vnode *tdvp = ap->a_tdvp; 647 struct vnode *fvp = ap->a_fvp; 648 struct vnode *fdvp = ap->a_fdvp; 649 struct componentname *tcnp = ap->a_tcnp; 650 struct componentname *fcnp = ap->a_fcnp; 651 struct inode *ip, *xp, *dp; 652 struct ext2fs_dirtemplate dirbuf; 653 int doingdirectory = 0, oldparent = 0, newparent = 0; 654 int error = 0; 655 u_char namlen; 656 657 #ifdef DIAGNOSTIC 658 if ((tcnp->cn_flags & HASBUF) == 0 || 659 (fcnp->cn_flags & HASBUF) == 0) 660 panic("ext2fs_rename: no name"); 661 #endif 662 /* 663 * Check for cross-device rename. 664 */ 665 if ((fvp->v_mount != tdvp->v_mount) || 666 (tvp && (fvp->v_mount != tvp->v_mount))) { 667 error = EXDEV; 668 abortit: 669 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 670 if (tdvp == tvp) 671 vrele(tdvp); 672 else 673 vput(tdvp); 674 if (tvp) 675 vput(tvp); 676 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 677 vrele(fdvp); 678 vrele(fvp); 679 return (error); 680 } 681 682 /* 683 * Check if just deleting a link name. 684 */ 685 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 686 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 687 error = EPERM; 688 goto abortit; 689 } 690 if (fvp == tvp) { 691 if (fvp->v_type == VDIR) { 692 error = EINVAL; 693 goto abortit; 694 } 695 696 /* Release destination completely. */ 697 VOP_ABORTOP(tdvp, tcnp); 698 vput(tdvp); 699 vput(tvp); 700 701 /* Delete source. */ 702 vrele(fvp); 703 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 704 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 705 fcnp->cn_nameiop = DELETE; 706 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 707 if ((error = relookup(fdvp, &fvp, fcnp))) { 708 vput(fdvp); 709 return (error); 710 } 711 return (VOP_REMOVE(fdvp, fvp, fcnp)); 712 } 713 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 714 goto abortit; 715 dp = VTOI(fdvp); 716 ip = VTOI(fvp); 717 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 718 VOP_UNLOCK(fvp, 0); 719 error = EMLINK; 720 goto abortit; 721 } 722 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 723 (dp->i_e2fs_flags & EXT2_APPEND)) { 724 VOP_UNLOCK(fvp, 0); 725 error = EPERM; 726 goto abortit; 727 } 728 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 729 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 730 if (!error && tvp) 731 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred); 732 if (error) { 733 VOP_UNLOCK(fvp, 0); 734 error = EACCES; 735 goto abortit; 736 } 737 /* 738 * Avoid ".", "..", and aliases of "." for obvious reasons. 739 */ 740 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 741 dp == ip || 742 (fcnp->cn_flags & ISDOTDOT) || 743 (tcnp->cn_flags & ISDOTDOT) || 744 (ip->i_flag & IN_RENAME)) { 745 VOP_UNLOCK(fvp, 0); 746 error = EINVAL; 747 goto abortit; 748 } 749 ip->i_flag |= IN_RENAME; 750 oldparent = dp->i_number; 751 doingdirectory = 1; 752 } 753 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 754 755 /* 756 * When the target exists, both the directory 757 * and target vnodes are returned locked. 758 */ 759 dp = VTOI(tdvp); 760 xp = NULL; 761 if (tvp) 762 xp = VTOI(tvp); 763 764 /* 765 * 1) Bump link count while we're moving stuff 766 * around. If we crash somewhere before 767 * completing our work, the link count 768 * may be wrong, but correctable. 769 */ 770 ip->i_e2fs_nlink++; 771 ip->i_flag |= IN_CHANGE; 772 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 773 VOP_UNLOCK(fvp, 0); 774 goto bad; 775 } 776 777 /* 778 * If ".." must be changed (ie the directory gets a new 779 * parent) then the source directory must not be in the 780 * directory hierarchy above the target, as this would 781 * orphan everything below the source directory. Also 782 * the user must have write permission in the source so 783 * as to be able to change "..". We must repeat the call 784 * to namei, as the parent directory is unlocked by the 785 * call to checkpath(). 786 */ 787 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 788 VOP_UNLOCK(fvp, 0); 789 if (oldparent != dp->i_number) 790 newparent = dp->i_number; 791 if (doingdirectory && newparent) { 792 if (error) /* write access check above */ 793 goto bad; 794 if (xp != NULL) 795 vput(tvp); 796 vref(tdvp); /* compensate for the ref checkpath loses */ 797 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 798 if (error != 0) { 799 vrele(tdvp); 800 goto out; 801 } 802 tcnp->cn_flags &= ~SAVESTART; 803 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 804 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) { 805 vput(tdvp); 806 goto out; 807 } 808 dp = VTOI(tdvp); 809 xp = NULL; 810 if (tvp) 811 xp = VTOI(tvp); 812 } 813 /* 814 * 2) If target doesn't exist, link the target 815 * to the source and unlink the source. 816 * Otherwise, rewrite the target directory 817 * entry to reference the source inode and 818 * expunge the original entry's existence. 819 */ 820 if (xp == NULL) { 821 if (dp->i_dev != ip->i_dev) 822 panic("rename: EXDEV"); 823 /* 824 * Account for ".." in new directory. 825 * When source and destination have the same 826 * parent we don't fool with the link count. 827 */ 828 if (doingdirectory && newparent) { 829 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 830 error = EMLINK; 831 goto bad; 832 } 833 dp->i_e2fs_nlink++; 834 dp->i_flag |= IN_CHANGE; 835 if ((error = ext2fs_update(tdvp, NULL, NULL, 836 UPDATE_WAIT)) != 0) 837 goto bad; 838 } 839 error = ext2fs_direnter(ip, tdvp, tcnp); 840 if (error != 0) { 841 if (doingdirectory && newparent) { 842 dp->i_e2fs_nlink--; 843 dp->i_flag |= IN_CHANGE; 844 (void)ext2fs_update(tdvp, NULL, NULL, 845 UPDATE_WAIT); 846 } 847 goto bad; 848 } 849 VN_KNOTE(tdvp, NOTE_WRITE); 850 vput(tdvp); 851 } else { 852 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 853 panic("rename: EXDEV"); 854 /* 855 * Short circuit rename(foo, foo). 856 */ 857 if (xp->i_number == ip->i_number) 858 panic("rename: same file"); 859 /* 860 * If the parent directory is "sticky", then the user must 861 * own the parent directory, or the destination of the rename, 862 * otherwise the destination may not be changed (except by 863 * root). This implements append-only directories. 864 */ 865 if ((dp->i_e2fs_mode & S_ISTXT) && 866 kauth_authorize_generic(tcnp->cn_cred, 867 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 868 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_e2fs_uid && 869 xp->i_e2fs_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 870 error = EPERM; 871 goto bad; 872 } 873 /* 874 * Target must be empty if a directory and have no links 875 * to it. Also, ensure source and target are compatible 876 * (both directories, or both not directories). 877 */ 878 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 879 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 880 xp->i_e2fs_nlink > 2) { 881 error = ENOTEMPTY; 882 goto bad; 883 } 884 if (!doingdirectory) { 885 error = ENOTDIR; 886 goto bad; 887 } 888 cache_purge(tdvp); 889 } else if (doingdirectory) { 890 error = EISDIR; 891 goto bad; 892 } 893 error = ext2fs_dirrewrite(dp, ip, tcnp); 894 if (error != 0) 895 goto bad; 896 /* 897 * If the target directory is in the same 898 * directory as the source directory, 899 * decrement the link count on the parent 900 * of the target directory. 901 */ 902 if (doingdirectory && !newparent) { 903 dp->i_e2fs_nlink--; 904 dp->i_flag |= IN_CHANGE; 905 } 906 /* 907 * Adjust the link count of the target to 908 * reflect the dirrewrite above. If this is 909 * a directory it is empty and there are 910 * no links to it, so we can squash the inode and 911 * any space associated with it. We disallowed 912 * renaming over top of a directory with links to 913 * it above, as the remaining link would point to 914 * a directory without "." or ".." entries. 915 */ 916 xp->i_e2fs_nlink--; 917 if (doingdirectory) { 918 if (--xp->i_e2fs_nlink != 0) 919 panic("rename: linked directory"); 920 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 921 tcnp->cn_cred); 922 } 923 xp->i_flag |= IN_CHANGE; 924 VN_KNOTE(tdvp, NOTE_WRITE); 925 vput(tdvp); 926 VN_KNOTE(tvp, NOTE_DELETE); 927 vput(tvp); 928 xp = NULL; 929 } 930 931 /* 932 * 3) Unlink the source. 933 */ 934 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 935 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 936 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 937 if ((error = relookup(fdvp, &fvp, fcnp))) { 938 vput(fdvp); 939 vrele(ap->a_fvp); 940 return (error); 941 } 942 if (fvp != NULL) { 943 xp = VTOI(fvp); 944 dp = VTOI(fdvp); 945 } else { 946 /* 947 * From name has disappeared. 948 */ 949 if (doingdirectory) 950 panic("ext2fs_rename: lost dir entry"); 951 vrele(ap->a_fvp); 952 return (0); 953 } 954 /* 955 * Ensure that the directory entry still exists and has not 956 * changed while the new name has been entered. If the source is 957 * a file then the entry may have been unlinked or renamed. In 958 * either case there is no further work to be done. If the source 959 * is a directory then it cannot have been rmdir'ed; its link 960 * count of three would cause a rmdir to fail with ENOTEMPTY. 961 * The IRENAME flag ensures that it cannot be moved by another 962 * rename. 963 */ 964 if (xp != ip) { 965 if (doingdirectory) 966 panic("ext2fs_rename: lost dir entry"); 967 } else { 968 /* 969 * If the source is a directory with a 970 * new parent, the link count of the old 971 * parent directory must be decremented 972 * and ".." set to point to the new parent. 973 */ 974 if (doingdirectory && newparent) { 975 KASSERT(dp != NULL); 976 dp->i_e2fs_nlink--; 977 dp->i_flag |= IN_CHANGE; 978 error = vn_rdwr(UIO_READ, fvp, (void *)&dirbuf, 979 sizeof (struct ext2fs_dirtemplate), (off_t)0, 980 UIO_SYSSPACE, IO_NODELOCKED, 981 tcnp->cn_cred, (size_t *)0, NULL); 982 if (error == 0) { 983 namlen = dirbuf.dotdot_namlen; 984 if (namlen != 2 || 985 dirbuf.dotdot_name[0] != '.' || 986 dirbuf.dotdot_name[1] != '.') { 987 ufs_dirbad(xp, (doff_t)12, 988 "ext2fs_rename: mangled dir"); 989 } else { 990 dirbuf.dotdot_ino = h2fs32(newparent); 991 (void) vn_rdwr(UIO_WRITE, fvp, 992 (void *)&dirbuf, 993 sizeof (struct dirtemplate), 994 (off_t)0, UIO_SYSSPACE, 995 IO_NODELOCKED|IO_SYNC, 996 tcnp->cn_cred, (size_t *)0, 997 NULL); 998 cache_purge(fdvp); 999 } 1000 } 1001 } 1002 error = ext2fs_dirremove(fdvp, fcnp); 1003 if (!error) { 1004 xp->i_e2fs_nlink--; 1005 xp->i_flag |= IN_CHANGE; 1006 } 1007 xp->i_flag &= ~IN_RENAME; 1008 } 1009 VN_KNOTE(fvp, NOTE_RENAME); 1010 if (dp) 1011 vput(fdvp); 1012 if (xp) 1013 vput(fvp); 1014 vrele(ap->a_fvp); 1015 return (error); 1016 1017 bad: 1018 if (xp) 1019 vput(ITOV(xp)); 1020 vput(ITOV(dp)); 1021 out: 1022 if (doingdirectory) 1023 ip->i_flag &= ~IN_RENAME; 1024 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1025 ip->i_e2fs_nlink--; 1026 ip->i_flag |= IN_CHANGE; 1027 vput(fvp); 1028 } else 1029 vrele(fvp); 1030 vrele(fdvp); 1031 return (error); 1032 } 1033 1034 /* 1035 * Mkdir system call 1036 */ 1037 int 1038 ext2fs_mkdir(void *v) 1039 { 1040 struct vop_mkdir_args /* { 1041 struct vnode *a_dvp; 1042 struct vnode **a_vpp; 1043 struct componentname *a_cnp; 1044 struct vattr *a_vap; 1045 } */ *ap = v; 1046 struct vnode *dvp = ap->a_dvp; 1047 struct vattr *vap = ap->a_vap; 1048 struct componentname *cnp = ap->a_cnp; 1049 struct inode *ip, *dp = VTOI(dvp); 1050 struct vnode *tvp; 1051 struct ext2fs_dirtemplate dirtemplate; 1052 int error, dmode; 1053 1054 #ifdef DIAGNOSTIC 1055 if ((cnp->cn_flags & HASBUF) == 0) 1056 panic("ext2fs_mkdir: no name"); 1057 #endif 1058 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1059 error = EMLINK; 1060 goto out; 1061 } 1062 dmode = vap->va_mode & ACCESSPERMS; 1063 dmode |= IFDIR; 1064 /* 1065 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1066 * but not have it entered in the parent directory. The entry is 1067 * made later after writing "." and ".." entries. 1068 */ 1069 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1070 goto out; 1071 ip = VTOI(tvp); 1072 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1073 ip->i_e2fs_gid = dp->i_e2fs_gid; 1074 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1075 ip->i_e2fs_mode = dmode; 1076 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1077 ip->i_e2fs_nlink = 2; 1078 1079 /* 1080 * Bump link count in parent directory 1081 * to reflect work done below. Should 1082 * be done before reference is created 1083 * so reparation is possible if we crash. 1084 */ 1085 dp->i_e2fs_nlink++; 1086 dp->i_flag |= IN_CHANGE; 1087 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1088 goto bad; 1089 1090 /* Initialize directory with "." and ".." from static template. */ 1091 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1092 dirtemplate.dot_ino = h2fs32(ip->i_number); 1093 dirtemplate.dot_reclen = h2fs16(12); 1094 dirtemplate.dot_namlen = 1; 1095 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1096 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1097 dirtemplate.dot_type = EXT2_FT_DIR; 1098 } 1099 dirtemplate.dot_name[0] = '.'; 1100 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1101 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1102 dirtemplate.dotdot_namlen = 2; 1103 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1104 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1105 dirtemplate.dotdot_type = EXT2_FT_DIR; 1106 } 1107 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1108 error = vn_rdwr(UIO_WRITE, tvp, (void *)&dirtemplate, 1109 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1110 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1111 if (error) { 1112 dp->i_e2fs_nlink--; 1113 dp->i_flag |= IN_CHANGE; 1114 goto bad; 1115 } 1116 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1117 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1118 else { 1119 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1120 if (error) { 1121 dp->i_e2fs_nlink--; 1122 dp->i_flag |= IN_CHANGE; 1123 goto bad; 1124 } 1125 ip->i_flag |= IN_CHANGE; 1126 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1127 } 1128 1129 /* Directory set up, now install it's entry in the parent directory. */ 1130 error = ext2fs_direnter(ip, dvp, cnp); 1131 if (error != 0) { 1132 dp->i_e2fs_nlink--; 1133 dp->i_flag |= IN_CHANGE; 1134 } 1135 bad: 1136 /* 1137 * No need to do an explicit ext2fs_truncate here, vrele will do this 1138 * for us because we set the link count to 0. 1139 */ 1140 if (error) { 1141 ip->i_e2fs_nlink = 0; 1142 ip->i_flag |= IN_CHANGE; 1143 vput(tvp); 1144 } else { 1145 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1146 *ap->a_vpp = tvp; 1147 } 1148 out: 1149 PNBUF_PUT(cnp->cn_pnbuf); 1150 vput(dvp); 1151 return (error); 1152 } 1153 1154 /* 1155 * Rmdir system call. 1156 */ 1157 int 1158 ext2fs_rmdir(void *v) 1159 { 1160 struct vop_rmdir_args /* { 1161 struct vnode *a_dvp; 1162 struct vnode *a_vp; 1163 struct componentname *a_cnp; 1164 } */ *ap = v; 1165 struct vnode *vp = ap->a_vp; 1166 struct vnode *dvp = ap->a_dvp; 1167 struct componentname *cnp = ap->a_cnp; 1168 struct inode *ip, *dp; 1169 int error; 1170 1171 ip = VTOI(vp); 1172 dp = VTOI(dvp); 1173 /* 1174 * No rmdir "." please. 1175 */ 1176 if (dp == ip) { 1177 vrele(dvp); 1178 vput(vp); 1179 return (EINVAL); 1180 } 1181 /* 1182 * Verify the directory is empty (and valid). 1183 * (Rmdir ".." won't be valid since 1184 * ".." will contain a reference to 1185 * the current directory and thus be 1186 * non-empty.) 1187 */ 1188 error = 0; 1189 if (ip->i_e2fs_nlink != 2 || 1190 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1191 error = ENOTEMPTY; 1192 goto out; 1193 } 1194 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1195 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1196 error = EPERM; 1197 goto out; 1198 } 1199 /* 1200 * Delete reference to directory before purging 1201 * inode. If we crash in between, the directory 1202 * will be reattached to lost+found, 1203 */ 1204 error = ext2fs_dirremove(dvp, cnp); 1205 if (error != 0) 1206 goto out; 1207 dp->i_e2fs_nlink--; 1208 dp->i_flag |= IN_CHANGE; 1209 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1210 cache_purge(dvp); 1211 vput(dvp); 1212 dvp = NULL; 1213 /* 1214 * Truncate inode. The only stuff left 1215 * in the directory is "." and "..". The 1216 * "." reference is inconsequential since 1217 * we're quashing it. The ".." reference 1218 * has already been adjusted above. We've 1219 * removed the "." reference and the reference 1220 * in the parent directory, but there may be 1221 * other hard links so decrement by 2 and 1222 * worry about them later. 1223 */ 1224 ip->i_e2fs_nlink -= 2; 1225 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred); 1226 cache_purge(ITOV(ip)); 1227 out: 1228 VN_KNOTE(vp, NOTE_DELETE); 1229 if (dvp) 1230 vput(dvp); 1231 vput(vp); 1232 return (error); 1233 } 1234 1235 /* 1236 * symlink -- make a symbolic link 1237 */ 1238 int 1239 ext2fs_symlink(void *v) 1240 { 1241 struct vop_symlink_args /* { 1242 struct vnode *a_dvp; 1243 struct vnode **a_vpp; 1244 struct componentname *a_cnp; 1245 struct vattr *a_vap; 1246 char *a_target; 1247 } */ *ap = v; 1248 struct vnode *vp, **vpp; 1249 struct inode *ip; 1250 int len, error; 1251 1252 vpp = ap->a_vpp; 1253 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1254 vpp, ap->a_cnp); 1255 if (error) 1256 return (error); 1257 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1258 vp = *vpp; 1259 len = strlen(ap->a_target); 1260 ip = VTOI(vp); 1261 if (len < ip->i_ump->um_maxsymlinklen) { 1262 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1263 error = ext2fs_setsize(ip, len); 1264 if (error) 1265 goto bad; 1266 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1267 uvm_vnp_setsize(vp, len); 1268 } else 1269 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1270 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1271 (size_t *)0, NULL); 1272 bad: 1273 if (error) 1274 vput(vp); 1275 return (error); 1276 } 1277 1278 /* 1279 * Return target name of a symbolic link 1280 */ 1281 int 1282 ext2fs_readlink(void *v) 1283 { 1284 struct vop_readlink_args /* { 1285 struct vnode *a_vp; 1286 struct uio *a_uio; 1287 kauth_cred_t a_cred; 1288 } */ *ap = v; 1289 struct vnode *vp = ap->a_vp; 1290 struct inode *ip = VTOI(vp); 1291 struct ufsmount *ump = ip->i_ump; 1292 int isize; 1293 1294 isize = ext2fs_size(ip); 1295 if (isize < ump->um_maxsymlinklen || 1296 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1297 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1298 return (0); 1299 } 1300 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1301 } 1302 1303 /* 1304 * Advisory record locking support 1305 */ 1306 int 1307 ext2fs_advlock(void *v) 1308 { 1309 struct vop_advlock_args /* { 1310 struct vnode *a_vp; 1311 void * a_id; 1312 int a_op; 1313 struct flock *a_fl; 1314 int a_flags; 1315 } */ *ap = v; 1316 struct inode *ip = VTOI(ap->a_vp); 1317 1318 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1319 } 1320 1321 int 1322 ext2fs_fsync(void *v) 1323 { 1324 struct vop_fsync_args /* { 1325 struct vnode *a_vp; 1326 kauth_cred_t a_cred; 1327 int a_flags; 1328 off_t offlo; 1329 off_t offhi; 1330 struct proc *a_p; 1331 } */ *ap = v; 1332 struct vnode *vp = ap->a_vp; 1333 int wait; 1334 int error; 1335 1336 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1337 vflushbuf(vp, wait); 1338 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1339 error = 0; 1340 else 1341 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1342 1343 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1344 int l = 0; 1345 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1346 curlwp->l_cred); 1347 } 1348 1349 return error; 1350 } 1351 1352 /* 1353 * Initialize the vnode associated with a new inode, handle aliased 1354 * vnodes. 1355 */ 1356 int 1357 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1358 int (**fifoops)(void *), struct vnode **vpp) 1359 { 1360 struct timeval tv; 1361 struct inode *ip; 1362 struct vnode *vp, *nvp; 1363 1364 vp = *vpp; 1365 ip = VTOI(vp); 1366 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1367 case VCHR: 1368 case VBLK: 1369 vp->v_op = specops; 1370 if ((nvp = checkalias(vp, 1371 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1372 /* 1373 * Discard unneeded vnode, but save its inode. 1374 */ 1375 nvp->v_data = vp->v_data; 1376 vp->v_data = NULL; 1377 vp->v_vflag &= ~VV_LOCKSWORK; 1378 VOP_UNLOCK(vp, 0); 1379 vp->v_op = spec_vnodeop_p; 1380 vrele(vp); 1381 vgone(vp); 1382 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1383 /* 1384 * Reinitialize aliased inode. 1385 */ 1386 vp = nvp; 1387 ip->i_vnode = vp; 1388 } 1389 break; 1390 case VFIFO: 1391 vp->v_op = fifoops; 1392 break; 1393 case VNON: 1394 case VBAD: 1395 case VSOCK: 1396 case VLNK: 1397 case VDIR: 1398 case VREG: 1399 break; 1400 } 1401 if (ip->i_number == ROOTINO) 1402 vp->v_vflag |= VV_ROOT; 1403 /* 1404 * Initialize modrev times 1405 */ 1406 getmicrouptime(&tv); 1407 SETHIGH(ip->i_modrev, tv.tv_sec); 1408 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1409 *vpp = vp; 1410 return (0); 1411 } 1412 1413 /* 1414 * Allocate a new inode. 1415 */ 1416 int 1417 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1418 struct componentname *cnp) 1419 { 1420 struct inode *ip, *pdir; 1421 struct vnode *tvp; 1422 int error, ismember = 0; 1423 1424 pdir = VTOI(dvp); 1425 #ifdef DIAGNOSTIC 1426 if ((cnp->cn_flags & HASBUF) == 0) 1427 panic("ext2fs_makeinode: no name"); 1428 #endif 1429 *vpp = NULL; 1430 if ((mode & IFMT) == 0) 1431 mode |= IFREG; 1432 1433 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1434 PNBUF_PUT(cnp->cn_pnbuf); 1435 vput(dvp); 1436 return (error); 1437 } 1438 ip = VTOI(tvp); 1439 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1440 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1441 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1442 ip->i_e2fs_mode = mode; 1443 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1444 ip->i_e2fs_nlink = 1; 1445 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1446 ip->i_e2fs_gid, &ismember) != 0 || !ismember) && 1447 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1448 ip->i_e2fs_mode &= ~ISGID; 1449 1450 /* 1451 * Make sure inode goes to disk before directory entry. 1452 */ 1453 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1454 goto bad; 1455 error = ext2fs_direnter(ip, dvp, cnp); 1456 if (error != 0) 1457 goto bad; 1458 if ((cnp->cn_flags & SAVESTART) == 0) 1459 PNBUF_PUT(cnp->cn_pnbuf); 1460 vput(dvp); 1461 *vpp = tvp; 1462 return (0); 1463 1464 bad: 1465 /* 1466 * Write error occurred trying to update the inode 1467 * or the directory so must deallocate the inode. 1468 */ 1469 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1470 ip->i_e2fs_nlink = 0; 1471 ip->i_flag |= IN_CHANGE; 1472 vput(tvp); 1473 PNBUF_PUT(cnp->cn_pnbuf); 1474 vput(dvp); 1475 return (error); 1476 } 1477 1478 /* 1479 * Reclaim an inode so that it can be used for other purposes. 1480 */ 1481 int 1482 ext2fs_reclaim(void *v) 1483 { 1484 struct vop_reclaim_args /* { 1485 struct vnode *a_vp; 1486 } */ *ap = v; 1487 struct vnode *vp = ap->a_vp; 1488 struct inode *ip = VTOI(vp); 1489 int error; 1490 1491 if ((error = ufs_reclaim(vp)) != 0) 1492 return (error); 1493 if (ip->i_din.e2fs_din != NULL) 1494 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1495 genfs_node_destroy(vp); 1496 pool_put(&ext2fs_inode_pool, vp->v_data); 1497 vp->v_data = NULL; 1498 return (0); 1499 } 1500 1501 /* Global vfs data structures for ext2fs. */ 1502 int (**ext2fs_vnodeop_p)(void *); 1503 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1504 { &vop_default_desc, vn_default_error }, 1505 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1506 { &vop_create_desc, ext2fs_create }, /* create */ 1507 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1508 { &vop_open_desc, ext2fs_open }, /* open */ 1509 { &vop_close_desc, ufs_close }, /* close */ 1510 { &vop_access_desc, ext2fs_access }, /* access */ 1511 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1512 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1513 { &vop_read_desc, ext2fs_read }, /* read */ 1514 { &vop_write_desc, ext2fs_write }, /* write */ 1515 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1516 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1517 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1518 { &vop_poll_desc, ufs_poll }, /* poll */ 1519 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1520 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1521 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1522 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1523 { &vop_seek_desc, ufs_seek }, /* seek */ 1524 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1525 { &vop_link_desc, ext2fs_link }, /* link */ 1526 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1527 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1528 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1529 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1530 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1531 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1532 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1533 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1534 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1535 { &vop_lock_desc, ufs_lock }, /* lock */ 1536 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1537 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1538 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1539 { &vop_print_desc, ufs_print }, /* print */ 1540 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1541 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1542 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1543 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1544 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1545 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1546 { NULL, NULL } 1547 }; 1548 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1549 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1550 1551 int (**ext2fs_specop_p)(void *); 1552 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1553 { &vop_default_desc, vn_default_error }, 1554 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1555 { &vop_create_desc, spec_create }, /* create */ 1556 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1557 { &vop_open_desc, spec_open }, /* open */ 1558 { &vop_close_desc, ufsspec_close }, /* close */ 1559 { &vop_access_desc, ext2fs_access }, /* access */ 1560 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1561 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1562 { &vop_read_desc, ufsspec_read }, /* read */ 1563 { &vop_write_desc, ufsspec_write }, /* write */ 1564 { &vop_lease_desc, spec_lease_check }, /* lease */ 1565 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1566 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1567 { &vop_poll_desc, spec_poll }, /* poll */ 1568 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1569 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1570 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1571 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1572 { &vop_seek_desc, spec_seek }, /* seek */ 1573 { &vop_remove_desc, spec_remove }, /* remove */ 1574 { &vop_link_desc, spec_link }, /* link */ 1575 { &vop_rename_desc, spec_rename }, /* rename */ 1576 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1577 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1578 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1579 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1580 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1581 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1582 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1583 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1584 { &vop_lock_desc, ufs_lock }, /* lock */ 1585 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1586 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1587 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1588 { &vop_print_desc, ufs_print }, /* print */ 1589 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1590 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1591 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1592 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1593 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1594 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1595 { NULL, NULL } 1596 }; 1597 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1598 { &ext2fs_specop_p, ext2fs_specop_entries }; 1599 1600 int (**ext2fs_fifoop_p)(void *); 1601 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1602 { &vop_default_desc, vn_default_error }, 1603 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1604 { &vop_create_desc, fifo_create }, /* create */ 1605 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1606 { &vop_open_desc, fifo_open }, /* open */ 1607 { &vop_close_desc, ufsfifo_close }, /* close */ 1608 { &vop_access_desc, ext2fs_access }, /* access */ 1609 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1610 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1611 { &vop_read_desc, ufsfifo_read }, /* read */ 1612 { &vop_write_desc, ufsfifo_write }, /* write */ 1613 { &vop_lease_desc, fifo_lease_check }, /* lease */ 1614 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1615 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1616 { &vop_poll_desc, fifo_poll }, /* poll */ 1617 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1618 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1619 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1620 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1621 { &vop_seek_desc, fifo_seek }, /* seek */ 1622 { &vop_remove_desc, fifo_remove }, /* remove */ 1623 { &vop_link_desc, fifo_link }, /* link */ 1624 { &vop_rename_desc, fifo_rename }, /* rename */ 1625 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1626 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1627 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1628 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1629 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1630 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1631 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1632 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1633 { &vop_lock_desc, ufs_lock }, /* lock */ 1634 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1635 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1636 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1637 { &vop_print_desc, ufs_print }, /* print */ 1638 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1639 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1640 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1641 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1642 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1643 { NULL, NULL } 1644 }; 1645 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1646 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1647