ext2fs_vnops.c revision 1.82.10.1.4.1
1 /* $NetBSD: ext2fs_vnops.c,v 1.82.10.1.4.1 2010/04/21 00:28:25 matt 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 1.82.10.1.4.1 2010/04/21 00:28:25 matt 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 VOP_UNLOCK(*vpp, 0); 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_uid, ip->i_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_uid; 287 vap->va_gid = ip->i_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_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_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_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_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_uid; 479 if (gid == (gid_t)VNOVAL) 480 gid = ip->i_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_uid || uid != ip->i_uid || 487 (gid != ip->i_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_gid; 493 ouid = ip->i_uid; 494 495 ip->i_e2fs_gid = gid & 0xffff; 496 ip->i_e2fs_uid = uid & 0xffff; 497 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 498 ip->i_e2fs_gid_high = (gid >> 16) & 0xffff; 499 ip->i_e2fs_uid_high = (uid >> 16) & 0xffff; 500 } else { 501 ip->i_e2fs_gid_high = 0; 502 ip->i_e2fs_uid_high = 0; 503 } 504 if (ouid != uid || ogid != gid) { 505 ext2fs_set_inode_guid(ip); 506 ip->i_flag |= IN_CHANGE; 507 } 508 if (ouid != uid && kauth_authorize_generic(cred, 509 KAUTH_GENERIC_ISSUSER, NULL) != 0) 510 ip->i_e2fs_mode &= ~ISUID; 511 if (ogid != gid && kauth_authorize_generic(cred, 512 KAUTH_GENERIC_ISSUSER, NULL) != 0) 513 ip->i_e2fs_mode &= ~ISGID; 514 return (0); 515 } 516 517 int 518 ext2fs_remove(void *v) 519 { 520 struct vop_remove_args /* { 521 struct vnode *a_dvp; 522 struct vnode *a_vp; 523 struct componentname *a_cnp; 524 } */ *ap = v; 525 struct inode *ip; 526 struct vnode *vp = ap->a_vp; 527 struct vnode *dvp = ap->a_dvp; 528 int error; 529 530 ip = VTOI(vp); 531 if (vp->v_type == VDIR || 532 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 533 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 534 error = EPERM; 535 } else { 536 error = ext2fs_dirremove(dvp, ap->a_cnp); 537 if (error == 0) { 538 ip->i_e2fs_nlink--; 539 ip->i_flag |= IN_CHANGE; 540 } 541 } 542 543 VN_KNOTE(vp, NOTE_DELETE); 544 VN_KNOTE(dvp, NOTE_WRITE); 545 if (dvp == vp) 546 vrele(vp); 547 else 548 vput(vp); 549 vput(dvp); 550 return (error); 551 } 552 553 /* 554 * link vnode call 555 */ 556 int 557 ext2fs_link(void *v) 558 { 559 struct vop_link_args /* { 560 struct vnode *a_dvp; 561 struct vnode *a_vp; 562 struct componentname *a_cnp; 563 } */ *ap = v; 564 struct vnode *dvp = ap->a_dvp; 565 struct vnode *vp = ap->a_vp; 566 struct componentname *cnp = ap->a_cnp; 567 struct inode *ip; 568 int error; 569 570 #ifdef DIAGNOSTIC 571 if ((cnp->cn_flags & HASBUF) == 0) 572 panic("ext2fs_link: no name"); 573 #endif 574 if (vp->v_type == VDIR) { 575 VOP_ABORTOP(dvp, cnp); 576 error = EISDIR; 577 goto out2; 578 } 579 if (dvp->v_mount != vp->v_mount) { 580 VOP_ABORTOP(dvp, cnp); 581 error = EXDEV; 582 goto out2; 583 } 584 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 585 VOP_ABORTOP(dvp, cnp); 586 goto out2; 587 } 588 ip = VTOI(vp); 589 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 590 VOP_ABORTOP(dvp, cnp); 591 error = EMLINK; 592 goto out1; 593 } 594 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 595 VOP_ABORTOP(dvp, cnp); 596 error = EPERM; 597 goto out1; 598 } 599 ip->i_e2fs_nlink++; 600 ip->i_flag |= IN_CHANGE; 601 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 602 if (!error) 603 error = ext2fs_direnter(ip, dvp, cnp); 604 if (error) { 605 ip->i_e2fs_nlink--; 606 ip->i_flag |= IN_CHANGE; 607 } 608 PNBUF_PUT(cnp->cn_pnbuf); 609 out1: 610 if (dvp != vp) 611 VOP_UNLOCK(vp, 0); 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 #ifdef DIAGNOSTIC 667 if ((tcnp->cn_flags & HASBUF) == 0 || 668 (fcnp->cn_flags & HASBUF) == 0) 669 panic("ext2fs_rename: no name"); 670 #endif 671 /* 672 * Check for cross-device rename. 673 */ 674 if ((fvp->v_mount != tdvp->v_mount) || 675 (tvp && (fvp->v_mount != tvp->v_mount))) { 676 error = EXDEV; 677 abortit: 678 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 679 if (tdvp == tvp) 680 vrele(tdvp); 681 else 682 vput(tdvp); 683 if (tvp) 684 vput(tvp); 685 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 686 vrele(fdvp); 687 vrele(fvp); 688 return (error); 689 } 690 691 /* 692 * Check if just deleting a link name. 693 */ 694 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 695 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 696 error = EPERM; 697 goto abortit; 698 } 699 if (fvp == tvp) { 700 if (fvp->v_type == VDIR) { 701 error = EINVAL; 702 goto abortit; 703 } 704 705 /* Release destination completely. */ 706 VOP_ABORTOP(tdvp, tcnp); 707 vput(tdvp); 708 vput(tvp); 709 710 /* Delete source. */ 711 vrele(fvp); 712 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 713 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 714 fcnp->cn_nameiop = DELETE; 715 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 716 if ((error = relookup(fdvp, &fvp, fcnp))) { 717 vput(fdvp); 718 return (error); 719 } 720 return (VOP_REMOVE(fdvp, fvp, fcnp)); 721 } 722 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 723 goto abortit; 724 dp = VTOI(fdvp); 725 ip = VTOI(fvp); 726 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 727 VOP_UNLOCK(fvp, 0); 728 error = EMLINK; 729 goto abortit; 730 } 731 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 732 (dp->i_e2fs_flags & EXT2_APPEND)) { 733 VOP_UNLOCK(fvp, 0); 734 error = EPERM; 735 goto abortit; 736 } 737 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 738 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 739 if (!error && tvp) 740 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred); 741 if (error) { 742 VOP_UNLOCK(fvp, 0); 743 error = EACCES; 744 goto abortit; 745 } 746 /* 747 * Avoid ".", "..", and aliases of "." for obvious reasons. 748 */ 749 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 750 dp == ip || 751 (fcnp->cn_flags & ISDOTDOT) || 752 (tcnp->cn_flags & ISDOTDOT) || 753 (ip->i_flag & IN_RENAME)) { 754 VOP_UNLOCK(fvp, 0); 755 error = EINVAL; 756 goto abortit; 757 } 758 ip->i_flag |= IN_RENAME; 759 oldparent = dp->i_number; 760 doingdirectory = 1; 761 } 762 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 763 764 /* 765 * When the target exists, both the directory 766 * and target vnodes are returned locked. 767 */ 768 dp = VTOI(tdvp); 769 xp = NULL; 770 if (tvp) 771 xp = VTOI(tvp); 772 773 /* 774 * 1) Bump link count while we're moving stuff 775 * around. If we crash somewhere before 776 * completing our work, the link count 777 * may be wrong, but correctable. 778 */ 779 ip->i_e2fs_nlink++; 780 ip->i_flag |= IN_CHANGE; 781 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 782 VOP_UNLOCK(fvp, 0); 783 goto bad; 784 } 785 786 /* 787 * If ".." must be changed (ie the directory gets a new 788 * parent) then the source directory must not be in the 789 * directory hierarchy above the target, as this would 790 * orphan everything below the source directory. Also 791 * the user must have write permission in the source so 792 * as to be able to change "..". We must repeat the call 793 * to namei, as the parent directory is unlocked by the 794 * call to checkpath(). 795 */ 796 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 797 VOP_UNLOCK(fvp, 0); 798 if (oldparent != dp->i_number) 799 newparent = dp->i_number; 800 if (doingdirectory && newparent) { 801 if (error) /* write access check above */ 802 goto bad; 803 if (xp != NULL) 804 vput(tvp); 805 vref(tdvp); /* compensate for the ref checkpath loses */ 806 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 807 if (error != 0) { 808 vrele(tdvp); 809 goto out; 810 } 811 tcnp->cn_flags &= ~SAVESTART; 812 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 813 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) { 814 vput(tdvp); 815 goto out; 816 } 817 dp = VTOI(tdvp); 818 xp = NULL; 819 if (tvp) 820 xp = VTOI(tvp); 821 } 822 /* 823 * 2) If target doesn't exist, link the target 824 * to the source and unlink the source. 825 * Otherwise, rewrite the target directory 826 * entry to reference the source inode and 827 * expunge the original entry's existence. 828 */ 829 if (xp == NULL) { 830 if (dp->i_dev != ip->i_dev) 831 panic("rename: EXDEV"); 832 /* 833 * Account for ".." in new directory. 834 * When source and destination have the same 835 * parent we don't fool with the link count. 836 */ 837 if (doingdirectory && newparent) { 838 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 839 error = EMLINK; 840 goto bad; 841 } 842 dp->i_e2fs_nlink++; 843 dp->i_flag |= IN_CHANGE; 844 if ((error = ext2fs_update(tdvp, NULL, NULL, 845 UPDATE_WAIT)) != 0) 846 goto bad; 847 } 848 error = ext2fs_direnter(ip, tdvp, tcnp); 849 if (error != 0) { 850 if (doingdirectory && newparent) { 851 dp->i_e2fs_nlink--; 852 dp->i_flag |= IN_CHANGE; 853 (void)ext2fs_update(tdvp, NULL, NULL, 854 UPDATE_WAIT); 855 } 856 goto bad; 857 } 858 VN_KNOTE(tdvp, NOTE_WRITE); 859 vput(tdvp); 860 } else { 861 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 862 panic("rename: EXDEV"); 863 /* 864 * Short circuit rename(foo, foo). 865 */ 866 if (xp->i_number == ip->i_number) 867 panic("rename: same file"); 868 /* 869 * If the parent directory is "sticky", then the user must 870 * own the parent directory, or the destination of the rename, 871 * otherwise the destination may not be changed (except by 872 * root). This implements append-only directories. 873 */ 874 if ((dp->i_e2fs_mode & S_ISTXT) && 875 kauth_authorize_generic(tcnp->cn_cred, 876 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 877 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_uid && 878 xp->i_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 879 error = EPERM; 880 goto bad; 881 } 882 /* 883 * Target must be empty if a directory and have no links 884 * to it. Also, ensure source and target are compatible 885 * (both directories, or both not directories). 886 */ 887 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 888 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 889 xp->i_e2fs_nlink > 2) { 890 error = ENOTEMPTY; 891 goto bad; 892 } 893 if (!doingdirectory) { 894 error = ENOTDIR; 895 goto bad; 896 } 897 cache_purge(tdvp); 898 } else if (doingdirectory) { 899 error = EISDIR; 900 goto bad; 901 } 902 error = ext2fs_dirrewrite(dp, ip, tcnp); 903 if (error != 0) 904 goto bad; 905 /* 906 * If the target directory is in the same 907 * directory as the source directory, 908 * decrement the link count on the parent 909 * of the target directory. 910 */ 911 if (doingdirectory && !newparent) { 912 dp->i_e2fs_nlink--; 913 dp->i_flag |= IN_CHANGE; 914 } 915 /* 916 * Adjust the link count of the target to 917 * reflect the dirrewrite above. If this is 918 * a directory it is empty and there are 919 * no links to it, so we can squash the inode and 920 * any space associated with it. We disallowed 921 * renaming over top of a directory with links to 922 * it above, as the remaining link would point to 923 * a directory without "." or ".." entries. 924 */ 925 xp->i_e2fs_nlink--; 926 if (doingdirectory) { 927 if (--xp->i_e2fs_nlink != 0) 928 panic("rename: linked directory"); 929 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 930 tcnp->cn_cred); 931 } 932 xp->i_flag |= IN_CHANGE; 933 VN_KNOTE(tdvp, NOTE_WRITE); 934 vput(tdvp); 935 VN_KNOTE(tvp, NOTE_DELETE); 936 vput(tvp); 937 xp = NULL; 938 } 939 940 /* 941 * 3) Unlink the source. 942 */ 943 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 944 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 945 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 946 if ((error = relookup(fdvp, &fvp, fcnp))) { 947 vput(fdvp); 948 vrele(ap->a_fvp); 949 return (error); 950 } 951 if (fvp != NULL) { 952 xp = VTOI(fvp); 953 dp = VTOI(fdvp); 954 } else { 955 /* 956 * From name has disappeared. 957 */ 958 if (doingdirectory) 959 panic("ext2fs_rename: lost dir entry"); 960 vrele(ap->a_fvp); 961 return (0); 962 } 963 /* 964 * Ensure that the directory entry still exists and has not 965 * changed while the new name has been entered. If the source is 966 * a file then the entry may have been unlinked or renamed. In 967 * either case there is no further work to be done. If the source 968 * is a directory then it cannot have been rmdir'ed; its link 969 * count of three would cause a rmdir to fail with ENOTEMPTY. 970 * The IRENAME flag ensures that it cannot be moved by another 971 * rename. 972 */ 973 if (xp != ip) { 974 if (doingdirectory) 975 panic("ext2fs_rename: lost dir entry"); 976 } else { 977 /* 978 * If the source is a directory with a 979 * new parent, the link count of the old 980 * parent directory must be decremented 981 * and ".." set to point to the new parent. 982 */ 983 if (doingdirectory && newparent) { 984 KASSERT(dp != NULL); 985 dp->i_e2fs_nlink--; 986 dp->i_flag |= IN_CHANGE; 987 error = vn_rdwr(UIO_READ, fvp, (void *)&dirbuf, 988 sizeof (struct ext2fs_dirtemplate), (off_t)0, 989 UIO_SYSSPACE, IO_NODELOCKED, 990 tcnp->cn_cred, (size_t *)0, NULL); 991 if (error == 0) { 992 namlen = dirbuf.dotdot_namlen; 993 if (namlen != 2 || 994 dirbuf.dotdot_name[0] != '.' || 995 dirbuf.dotdot_name[1] != '.') { 996 ufs_dirbad(xp, (doff_t)12, 997 "ext2fs_rename: mangled dir"); 998 } else { 999 dirbuf.dotdot_ino = h2fs32(newparent); 1000 (void) vn_rdwr(UIO_WRITE, fvp, 1001 (void *)&dirbuf, 1002 sizeof (struct dirtemplate), 1003 (off_t)0, UIO_SYSSPACE, 1004 IO_NODELOCKED|IO_SYNC, 1005 tcnp->cn_cred, (size_t *)0, 1006 NULL); 1007 cache_purge(fdvp); 1008 } 1009 } 1010 } 1011 error = ext2fs_dirremove(fdvp, fcnp); 1012 if (!error) { 1013 xp->i_e2fs_nlink--; 1014 xp->i_flag |= IN_CHANGE; 1015 } 1016 xp->i_flag &= ~IN_RENAME; 1017 } 1018 VN_KNOTE(fvp, NOTE_RENAME); 1019 if (dp) 1020 vput(fdvp); 1021 if (xp) 1022 vput(fvp); 1023 vrele(ap->a_fvp); 1024 return (error); 1025 1026 bad: 1027 if (xp) 1028 vput(ITOV(xp)); 1029 vput(ITOV(dp)); 1030 out: 1031 if (doingdirectory) 1032 ip->i_flag &= ~IN_RENAME; 1033 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1034 ip->i_e2fs_nlink--; 1035 ip->i_flag |= IN_CHANGE; 1036 vput(fvp); 1037 } else 1038 vrele(fvp); 1039 vrele(fdvp); 1040 return (error); 1041 } 1042 1043 /* 1044 * Mkdir system call 1045 */ 1046 int 1047 ext2fs_mkdir(void *v) 1048 { 1049 struct vop_mkdir_args /* { 1050 struct vnode *a_dvp; 1051 struct vnode **a_vpp; 1052 struct componentname *a_cnp; 1053 struct vattr *a_vap; 1054 } */ *ap = v; 1055 struct vnode *dvp = ap->a_dvp; 1056 struct vattr *vap = ap->a_vap; 1057 struct componentname *cnp = ap->a_cnp; 1058 struct inode *ip, *dp = VTOI(dvp); 1059 struct vnode *tvp; 1060 struct ext2fs_dirtemplate dirtemplate; 1061 int error, dmode; 1062 1063 #ifdef DIAGNOSTIC 1064 if ((cnp->cn_flags & HASBUF) == 0) 1065 panic("ext2fs_mkdir: no name"); 1066 #endif 1067 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1068 error = EMLINK; 1069 goto out; 1070 } 1071 dmode = vap->va_mode & ACCESSPERMS; 1072 dmode |= IFDIR; 1073 /* 1074 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1075 * but not have it entered in the parent directory. The entry is 1076 * made later after writing "." and ".." entries. 1077 */ 1078 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1079 goto out; 1080 ip = VTOI(tvp); 1081 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1082 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1083 ip->i_e2fs_gid = dp->i_e2fs_gid; 1084 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1085 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1086 ip->i_e2fs_gid_high = dp->i_e2fs_gid_high; 1087 } else { 1088 ip->i_e2fs_uid_high = 0; 1089 ip->i_e2fs_gid_high = 0; 1090 } 1091 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1092 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1093 ip->i_e2fs_mode = dmode; 1094 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1095 ip->i_e2fs_nlink = 2; 1096 1097 /* 1098 * Bump link count in parent directory 1099 * to reflect work done below. Should 1100 * be done before reference is created 1101 * so reparation is possible if we crash. 1102 */ 1103 dp->i_e2fs_nlink++; 1104 dp->i_flag |= IN_CHANGE; 1105 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1106 goto bad; 1107 1108 /* Initialize directory with "." and ".." from static template. */ 1109 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1110 dirtemplate.dot_ino = h2fs32(ip->i_number); 1111 dirtemplate.dot_reclen = h2fs16(12); 1112 dirtemplate.dot_namlen = 1; 1113 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1114 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1115 dirtemplate.dot_type = EXT2_FT_DIR; 1116 } 1117 dirtemplate.dot_name[0] = '.'; 1118 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1119 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1120 dirtemplate.dotdot_namlen = 2; 1121 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1122 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1123 dirtemplate.dotdot_type = EXT2_FT_DIR; 1124 } 1125 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1126 error = vn_rdwr(UIO_WRITE, tvp, (void *)&dirtemplate, 1127 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1128 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1129 if (error) { 1130 dp->i_e2fs_nlink--; 1131 dp->i_flag |= IN_CHANGE; 1132 goto bad; 1133 } 1134 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1135 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1136 else { 1137 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1138 if (error) { 1139 dp->i_e2fs_nlink--; 1140 dp->i_flag |= IN_CHANGE; 1141 goto bad; 1142 } 1143 ip->i_flag |= IN_CHANGE; 1144 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1145 } 1146 1147 /* Directory set up, now install it's entry in the parent directory. */ 1148 error = ext2fs_direnter(ip, dvp, cnp); 1149 if (error != 0) { 1150 dp->i_e2fs_nlink--; 1151 dp->i_flag |= IN_CHANGE; 1152 } 1153 bad: 1154 /* 1155 * No need to do an explicit ext2fs_truncate here, vrele will do this 1156 * for us because we set the link count to 0. 1157 */ 1158 if (error) { 1159 ip->i_e2fs_nlink = 0; 1160 ip->i_flag |= IN_CHANGE; 1161 vput(tvp); 1162 } else { 1163 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1164 *ap->a_vpp = tvp; 1165 } 1166 out: 1167 PNBUF_PUT(cnp->cn_pnbuf); 1168 vput(dvp); 1169 return (error); 1170 } 1171 1172 /* 1173 * Rmdir system call. 1174 */ 1175 int 1176 ext2fs_rmdir(void *v) 1177 { 1178 struct vop_rmdir_args /* { 1179 struct vnode *a_dvp; 1180 struct vnode *a_vp; 1181 struct componentname *a_cnp; 1182 } */ *ap = v; 1183 struct vnode *vp = ap->a_vp; 1184 struct vnode *dvp = ap->a_dvp; 1185 struct componentname *cnp = ap->a_cnp; 1186 struct inode *ip, *dp; 1187 int error; 1188 1189 ip = VTOI(vp); 1190 dp = VTOI(dvp); 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, 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 spec_fsync(v); 1358 else 1359 vflushbuf(vp, wait); 1360 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1361 error = 0; 1362 else 1363 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1364 1365 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1366 int l = 0; 1367 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1368 curlwp->l_cred); 1369 } 1370 1371 return error; 1372 } 1373 1374 /* 1375 * Initialize the vnode associated with a new inode, handle aliased 1376 * vnodes. 1377 */ 1378 int 1379 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1380 int (**fifoops)(void *), struct vnode **vpp) 1381 { 1382 struct timeval tv; 1383 struct inode *ip; 1384 struct vnode *vp; 1385 1386 vp = *vpp; 1387 ip = VTOI(vp); 1388 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1389 case VCHR: 1390 case VBLK: 1391 vp->v_op = specops; 1392 spec_node_init(vp, fs2h32(ip->i_din.e2fs_din->e2di_rdev)); 1393 break; 1394 case VFIFO: 1395 vp->v_op = fifoops; 1396 break; 1397 case VNON: 1398 case VBAD: 1399 case VSOCK: 1400 case VLNK: 1401 case VDIR: 1402 case VREG: 1403 break; 1404 } 1405 if (ip->i_number == ROOTINO) 1406 vp->v_vflag |= VV_ROOT; 1407 /* 1408 * Initialize modrev times 1409 */ 1410 getmicrouptime(&tv); 1411 SETHIGH(ip->i_modrev, tv.tv_sec); 1412 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1413 *vpp = vp; 1414 return (0); 1415 } 1416 1417 /* 1418 * Allocate a new inode. 1419 */ 1420 int 1421 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1422 struct componentname *cnp) 1423 { 1424 struct inode *ip, *pdir; 1425 struct vnode *tvp; 1426 int error, ismember = 0; 1427 1428 pdir = VTOI(dvp); 1429 #ifdef DIAGNOSTIC 1430 if ((cnp->cn_flags & HASBUF) == 0) 1431 panic("ext2fs_makeinode: no name"); 1432 #endif 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 PNBUF_PUT(cnp->cn_pnbuf); 1439 vput(dvp); 1440 return (error); 1441 } 1442 ip = VTOI(tvp); 1443 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1444 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1445 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1446 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1447 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1448 ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high; 1449 } else { 1450 ip->i_e2fs_uid_high = 0; 1451 ip->i_e2fs_gid_high = 0; 1452 } 1453 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1454 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1455 ip->i_e2fs_mode = mode; 1456 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1457 ip->i_e2fs_nlink = 1; 1458 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1459 ip->i_gid, &ismember) != 0 || !ismember) && 1460 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1461 ip->i_e2fs_mode &= ~ISGID; 1462 1463 /* 1464 * Make sure inode goes to disk before directory entry. 1465 */ 1466 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1467 goto bad; 1468 error = ext2fs_direnter(ip, dvp, cnp); 1469 if (error != 0) 1470 goto bad; 1471 if ((cnp->cn_flags & SAVESTART) == 0) 1472 PNBUF_PUT(cnp->cn_pnbuf); 1473 vput(dvp); 1474 *vpp = tvp; 1475 return (0); 1476 1477 bad: 1478 /* 1479 * Write error occurred trying to update the inode 1480 * or the directory so must deallocate the inode. 1481 */ 1482 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1483 ip->i_e2fs_nlink = 0; 1484 ip->i_flag |= IN_CHANGE; 1485 vput(tvp); 1486 PNBUF_PUT(cnp->cn_pnbuf); 1487 vput(dvp); 1488 return (error); 1489 } 1490 1491 /* 1492 * Reclaim an inode so that it can be used for other purposes. 1493 */ 1494 int 1495 ext2fs_reclaim(void *v) 1496 { 1497 struct vop_reclaim_args /* { 1498 struct vnode *a_vp; 1499 } */ *ap = v; 1500 struct vnode *vp = ap->a_vp; 1501 struct inode *ip = VTOI(vp); 1502 int error; 1503 1504 if ((error = ufs_reclaim(vp)) != 0) 1505 return (error); 1506 if (ip->i_din.e2fs_din != NULL) 1507 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1508 genfs_node_destroy(vp); 1509 pool_put(&ext2fs_inode_pool, vp->v_data); 1510 vp->v_data = NULL; 1511 return (0); 1512 } 1513 1514 /* Global vfs data structures for ext2fs. */ 1515 int (**ext2fs_vnodeop_p)(void *); 1516 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1517 { &vop_default_desc, vn_default_error }, 1518 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1519 { &vop_create_desc, ext2fs_create }, /* create */ 1520 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1521 { &vop_open_desc, ext2fs_open }, /* open */ 1522 { &vop_close_desc, ufs_close }, /* close */ 1523 { &vop_access_desc, ext2fs_access }, /* access */ 1524 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1525 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1526 { &vop_read_desc, ext2fs_read }, /* read */ 1527 { &vop_write_desc, ext2fs_write }, /* write */ 1528 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1529 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1530 { &vop_poll_desc, ufs_poll }, /* poll */ 1531 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1532 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1533 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1534 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1535 { &vop_seek_desc, ufs_seek }, /* seek */ 1536 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1537 { &vop_link_desc, ext2fs_link }, /* link */ 1538 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1539 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1540 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1541 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1542 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1543 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1544 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1545 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1546 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1547 { &vop_lock_desc, ufs_lock }, /* lock */ 1548 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1549 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1550 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1551 { &vop_print_desc, ufs_print }, /* print */ 1552 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1553 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1554 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1555 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1556 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1557 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1558 { NULL, NULL } 1559 }; 1560 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1561 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1562 1563 int (**ext2fs_specop_p)(void *); 1564 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1565 { &vop_default_desc, vn_default_error }, 1566 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1567 { &vop_create_desc, spec_create }, /* create */ 1568 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1569 { &vop_open_desc, spec_open }, /* open */ 1570 { &vop_close_desc, ufsspec_close }, /* close */ 1571 { &vop_access_desc, ext2fs_access }, /* access */ 1572 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1573 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1574 { &vop_read_desc, ufsspec_read }, /* read */ 1575 { &vop_write_desc, ufsspec_write }, /* write */ 1576 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1577 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1578 { &vop_poll_desc, spec_poll }, /* poll */ 1579 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1580 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1581 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1582 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1583 { &vop_seek_desc, spec_seek }, /* seek */ 1584 { &vop_remove_desc, spec_remove }, /* remove */ 1585 { &vop_link_desc, spec_link }, /* link */ 1586 { &vop_rename_desc, spec_rename }, /* rename */ 1587 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1588 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1589 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1590 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1591 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1592 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1593 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1594 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1595 { &vop_lock_desc, ufs_lock }, /* lock */ 1596 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1597 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1598 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1599 { &vop_print_desc, ufs_print }, /* print */ 1600 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1601 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1602 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1603 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1604 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1605 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1606 { NULL, NULL } 1607 }; 1608 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1609 { &ext2fs_specop_p, ext2fs_specop_entries }; 1610 1611 int (**ext2fs_fifoop_p)(void *); 1612 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1613 { &vop_default_desc, vn_default_error }, 1614 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1615 { &vop_create_desc, fifo_create }, /* create */ 1616 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1617 { &vop_open_desc, fifo_open }, /* open */ 1618 { &vop_close_desc, ufsfifo_close }, /* close */ 1619 { &vop_access_desc, ext2fs_access }, /* access */ 1620 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1621 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1622 { &vop_read_desc, ufsfifo_read }, /* read */ 1623 { &vop_write_desc, ufsfifo_write }, /* write */ 1624 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1625 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1626 { &vop_poll_desc, fifo_poll }, /* poll */ 1627 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1628 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1629 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1630 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1631 { &vop_seek_desc, fifo_seek }, /* seek */ 1632 { &vop_remove_desc, fifo_remove }, /* remove */ 1633 { &vop_link_desc, fifo_link }, /* link */ 1634 { &vop_rename_desc, fifo_rename }, /* rename */ 1635 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1636 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1637 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1638 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1639 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1640 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1641 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1642 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1643 { &vop_lock_desc, ufs_lock }, /* lock */ 1644 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1645 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1646 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1647 { &vop_print_desc, ufs_print }, /* print */ 1648 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1649 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1650 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1651 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1652 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1653 { NULL, NULL } 1654 }; 1655 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1656 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1657
Indexes created Mon Oct 20 03:09:53 GMT 2025