ext2fs_vnops.c revision 1.83
1 /* $NetBSD: ext2fs_vnops.c,v 1.83 2008/11/23 10:09:25 mrg 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 1.83 2008/11/23 10:09:25 mrg 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 ip->i_flag |= IN_CHANGE; 506 if (ouid != uid && kauth_authorize_generic(cred, 507 KAUTH_GENERIC_ISSUSER, NULL) != 0) 508 ip->i_e2fs_mode &= ~ISUID; 509 if (ogid != gid && kauth_authorize_generic(cred, 510 KAUTH_GENERIC_ISSUSER, NULL) != 0) 511 ip->i_e2fs_mode &= ~ISGID; 512 return (0); 513 } 514 515 int 516 ext2fs_remove(void *v) 517 { 518 struct vop_remove_args /* { 519 struct vnode *a_dvp; 520 struct vnode *a_vp; 521 struct componentname *a_cnp; 522 } */ *ap = v; 523 struct inode *ip; 524 struct vnode *vp = ap->a_vp; 525 struct vnode *dvp = ap->a_dvp; 526 int error; 527 528 ip = VTOI(vp); 529 if (vp->v_type == VDIR || 530 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 531 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 532 error = EPERM; 533 } else { 534 error = ext2fs_dirremove(dvp, ap->a_cnp); 535 if (error == 0) { 536 ip->i_e2fs_nlink--; 537 ip->i_flag |= IN_CHANGE; 538 } 539 } 540 541 VN_KNOTE(vp, NOTE_DELETE); 542 VN_KNOTE(dvp, NOTE_WRITE); 543 if (dvp == vp) 544 vrele(vp); 545 else 546 vput(vp); 547 vput(dvp); 548 return (error); 549 } 550 551 /* 552 * link vnode call 553 */ 554 int 555 ext2fs_link(void *v) 556 { 557 struct vop_link_args /* { 558 struct vnode *a_dvp; 559 struct vnode *a_vp; 560 struct componentname *a_cnp; 561 } */ *ap = v; 562 struct vnode *dvp = ap->a_dvp; 563 struct vnode *vp = ap->a_vp; 564 struct componentname *cnp = ap->a_cnp; 565 struct inode *ip; 566 int error; 567 568 #ifdef DIAGNOSTIC 569 if ((cnp->cn_flags & HASBUF) == 0) 570 panic("ext2fs_link: no name"); 571 #endif 572 if (vp->v_type == VDIR) { 573 VOP_ABORTOP(dvp, cnp); 574 error = EISDIR; 575 goto out2; 576 } 577 if (dvp->v_mount != vp->v_mount) { 578 VOP_ABORTOP(dvp, cnp); 579 error = EXDEV; 580 goto out2; 581 } 582 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 583 VOP_ABORTOP(dvp, cnp); 584 goto out2; 585 } 586 ip = VTOI(vp); 587 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 588 VOP_ABORTOP(dvp, cnp); 589 error = EMLINK; 590 goto out1; 591 } 592 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 593 VOP_ABORTOP(dvp, cnp); 594 error = EPERM; 595 goto out1; 596 } 597 ip->i_e2fs_nlink++; 598 ip->i_flag |= IN_CHANGE; 599 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 600 if (!error) 601 error = ext2fs_direnter(ip, dvp, cnp); 602 if (error) { 603 ip->i_e2fs_nlink--; 604 ip->i_flag |= IN_CHANGE; 605 } 606 PNBUF_PUT(cnp->cn_pnbuf); 607 out1: 608 if (dvp != vp) 609 VOP_UNLOCK(vp, 0); 610 out2: 611 VN_KNOTE(vp, NOTE_LINK); 612 VN_KNOTE(dvp, NOTE_WRITE); 613 vput(dvp); 614 return (error); 615 } 616 617 /* 618 * Rename system call. 619 * rename("foo", "bar"); 620 * is essentially 621 * unlink("bar"); 622 * link("foo", "bar"); 623 * unlink("foo"); 624 * but ``atomically''. Can't do full commit without saving state in the 625 * inode on disk which isn't feasible at this time. Best we can do is 626 * always guarantee the target exists. 627 * 628 * Basic algorithm is: 629 * 630 * 1) Bump link count on source while we're linking it to the 631 * target. This also ensure the inode won't be deleted out 632 * from underneath us while we work (it may be truncated by 633 * a concurrent `trunc' or `open' for creation). 634 * 2) Link source to destination. If destination already exists, 635 * delete it first. 636 * 3) Unlink source reference to inode if still around. If a 637 * directory was moved and the parent of the destination 638 * is different from the source, patch the ".." entry in the 639 * directory. 640 */ 641 int 642 ext2fs_rename(void *v) 643 { 644 struct vop_rename_args /* { 645 struct vnode *a_fdvp; 646 struct vnode *a_fvp; 647 struct componentname *a_fcnp; 648 struct vnode *a_tdvp; 649 struct vnode *a_tvp; 650 struct componentname *a_tcnp; 651 } */ *ap = v; 652 struct vnode *tvp = ap->a_tvp; 653 struct vnode *tdvp = ap->a_tdvp; 654 struct vnode *fvp = ap->a_fvp; 655 struct vnode *fdvp = ap->a_fdvp; 656 struct componentname *tcnp = ap->a_tcnp; 657 struct componentname *fcnp = ap->a_fcnp; 658 struct inode *ip, *xp, *dp; 659 struct ext2fs_dirtemplate dirbuf; 660 int doingdirectory = 0, oldparent = 0, newparent = 0; 661 int error = 0; 662 u_char namlen; 663 664 #ifdef DIAGNOSTIC 665 if ((tcnp->cn_flags & HASBUF) == 0 || 666 (fcnp->cn_flags & HASBUF) == 0) 667 panic("ext2fs_rename: no name"); 668 #endif 669 /* 670 * Check for cross-device rename. 671 */ 672 if ((fvp->v_mount != tdvp->v_mount) || 673 (tvp && (fvp->v_mount != tvp->v_mount))) { 674 error = EXDEV; 675 abortit: 676 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 677 if (tdvp == tvp) 678 vrele(tdvp); 679 else 680 vput(tdvp); 681 if (tvp) 682 vput(tvp); 683 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 684 vrele(fdvp); 685 vrele(fvp); 686 return (error); 687 } 688 689 /* 690 * Check if just deleting a link name. 691 */ 692 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 693 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 694 error = EPERM; 695 goto abortit; 696 } 697 if (fvp == tvp) { 698 if (fvp->v_type == VDIR) { 699 error = EINVAL; 700 goto abortit; 701 } 702 703 /* Release destination completely. */ 704 VOP_ABORTOP(tdvp, tcnp); 705 vput(tdvp); 706 vput(tvp); 707 708 /* Delete source. */ 709 vrele(fvp); 710 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 711 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 712 fcnp->cn_nameiop = DELETE; 713 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 714 if ((error = relookup(fdvp, &fvp, fcnp))) { 715 vput(fdvp); 716 return (error); 717 } 718 return (VOP_REMOVE(fdvp, fvp, fcnp)); 719 } 720 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 721 goto abortit; 722 dp = VTOI(fdvp); 723 ip = VTOI(fvp); 724 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 725 VOP_UNLOCK(fvp, 0); 726 error = EMLINK; 727 goto abortit; 728 } 729 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 730 (dp->i_e2fs_flags & EXT2_APPEND)) { 731 VOP_UNLOCK(fvp, 0); 732 error = EPERM; 733 goto abortit; 734 } 735 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 736 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 737 if (!error && tvp) 738 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred); 739 if (error) { 740 VOP_UNLOCK(fvp, 0); 741 error = EACCES; 742 goto abortit; 743 } 744 /* 745 * Avoid ".", "..", and aliases of "." for obvious reasons. 746 */ 747 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 748 dp == ip || 749 (fcnp->cn_flags & ISDOTDOT) || 750 (tcnp->cn_flags & ISDOTDOT) || 751 (ip->i_flag & IN_RENAME)) { 752 VOP_UNLOCK(fvp, 0); 753 error = EINVAL; 754 goto abortit; 755 } 756 ip->i_flag |= IN_RENAME; 757 oldparent = dp->i_number; 758 doingdirectory = 1; 759 } 760 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 761 762 /* 763 * When the target exists, both the directory 764 * and target vnodes are returned locked. 765 */ 766 dp = VTOI(tdvp); 767 xp = NULL; 768 if (tvp) 769 xp = VTOI(tvp); 770 771 /* 772 * 1) Bump link count while we're moving stuff 773 * around. If we crash somewhere before 774 * completing our work, the link count 775 * may be wrong, but correctable. 776 */ 777 ip->i_e2fs_nlink++; 778 ip->i_flag |= IN_CHANGE; 779 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 780 VOP_UNLOCK(fvp, 0); 781 goto bad; 782 } 783 784 /* 785 * If ".." must be changed (ie the directory gets a new 786 * parent) then the source directory must not be in the 787 * directory hierarchy above the target, as this would 788 * orphan everything below the source directory. Also 789 * the user must have write permission in the source so 790 * as to be able to change "..". We must repeat the call 791 * to namei, as the parent directory is unlocked by the 792 * call to checkpath(). 793 */ 794 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 795 VOP_UNLOCK(fvp, 0); 796 if (oldparent != dp->i_number) 797 newparent = dp->i_number; 798 if (doingdirectory && newparent) { 799 if (error) /* write access check above */ 800 goto bad; 801 if (xp != NULL) 802 vput(tvp); 803 vref(tdvp); /* compensate for the ref checkpath loses */ 804 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 805 if (error != 0) { 806 vrele(tdvp); 807 goto out; 808 } 809 tcnp->cn_flags &= ~SAVESTART; 810 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 811 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) { 812 vput(tdvp); 813 goto out; 814 } 815 dp = VTOI(tdvp); 816 xp = NULL; 817 if (tvp) 818 xp = VTOI(tvp); 819 } 820 /* 821 * 2) If target doesn't exist, link the target 822 * to the source and unlink the source. 823 * Otherwise, rewrite the target directory 824 * entry to reference the source inode and 825 * expunge the original entry's existence. 826 */ 827 if (xp == NULL) { 828 if (dp->i_dev != ip->i_dev) 829 panic("rename: EXDEV"); 830 /* 831 * Account for ".." in new directory. 832 * When source and destination have the same 833 * parent we don't fool with the link count. 834 */ 835 if (doingdirectory && newparent) { 836 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 837 error = EMLINK; 838 goto bad; 839 } 840 dp->i_e2fs_nlink++; 841 dp->i_flag |= IN_CHANGE; 842 if ((error = ext2fs_update(tdvp, NULL, NULL, 843 UPDATE_WAIT)) != 0) 844 goto bad; 845 } 846 error = ext2fs_direnter(ip, tdvp, tcnp); 847 if (error != 0) { 848 if (doingdirectory && newparent) { 849 dp->i_e2fs_nlink--; 850 dp->i_flag |= IN_CHANGE; 851 (void)ext2fs_update(tdvp, NULL, NULL, 852 UPDATE_WAIT); 853 } 854 goto bad; 855 } 856 VN_KNOTE(tdvp, NOTE_WRITE); 857 vput(tdvp); 858 } else { 859 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 860 panic("rename: EXDEV"); 861 /* 862 * Short circuit rename(foo, foo). 863 */ 864 if (xp->i_number == ip->i_number) 865 panic("rename: same file"); 866 /* 867 * If the parent directory is "sticky", then the user must 868 * own the parent directory, or the destination of the rename, 869 * otherwise the destination may not be changed (except by 870 * root). This implements append-only directories. 871 */ 872 if ((dp->i_e2fs_mode & S_ISTXT) && 873 kauth_authorize_generic(tcnp->cn_cred, 874 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 875 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_uid && 876 xp->i_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 877 error = EPERM; 878 goto bad; 879 } 880 /* 881 * Target must be empty if a directory and have no links 882 * to it. Also, ensure source and target are compatible 883 * (both directories, or both not directories). 884 */ 885 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 886 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 887 xp->i_e2fs_nlink > 2) { 888 error = ENOTEMPTY; 889 goto bad; 890 } 891 if (!doingdirectory) { 892 error = ENOTDIR; 893 goto bad; 894 } 895 cache_purge(tdvp); 896 } else if (doingdirectory) { 897 error = EISDIR; 898 goto bad; 899 } 900 error = ext2fs_dirrewrite(dp, ip, tcnp); 901 if (error != 0) 902 goto bad; 903 /* 904 * If the target directory is in the same 905 * directory as the source directory, 906 * decrement the link count on the parent 907 * of the target directory. 908 */ 909 if (doingdirectory && !newparent) { 910 dp->i_e2fs_nlink--; 911 dp->i_flag |= IN_CHANGE; 912 } 913 /* 914 * Adjust the link count of the target to 915 * reflect the dirrewrite above. If this is 916 * a directory it is empty and there are 917 * no links to it, so we can squash the inode and 918 * any space associated with it. We disallowed 919 * renaming over top of a directory with links to 920 * it above, as the remaining link would point to 921 * a directory without "." or ".." entries. 922 */ 923 xp->i_e2fs_nlink--; 924 if (doingdirectory) { 925 if (--xp->i_e2fs_nlink != 0) 926 panic("rename: linked directory"); 927 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 928 tcnp->cn_cred); 929 } 930 xp->i_flag |= IN_CHANGE; 931 VN_KNOTE(tdvp, NOTE_WRITE); 932 vput(tdvp); 933 VN_KNOTE(tvp, NOTE_DELETE); 934 vput(tvp); 935 xp = NULL; 936 } 937 938 /* 939 * 3) Unlink the source. 940 */ 941 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 942 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 943 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 944 if ((error = relookup(fdvp, &fvp, fcnp))) { 945 vput(fdvp); 946 vrele(ap->a_fvp); 947 return (error); 948 } 949 if (fvp != NULL) { 950 xp = VTOI(fvp); 951 dp = VTOI(fdvp); 952 } else { 953 /* 954 * From name has disappeared. 955 */ 956 if (doingdirectory) 957 panic("ext2fs_rename: lost dir entry"); 958 vrele(ap->a_fvp); 959 return (0); 960 } 961 /* 962 * Ensure that the directory entry still exists and has not 963 * changed while the new name has been entered. If the source is 964 * a file then the entry may have been unlinked or renamed. In 965 * either case there is no further work to be done. If the source 966 * is a directory then it cannot have been rmdir'ed; its link 967 * count of three would cause a rmdir to fail with ENOTEMPTY. 968 * The IRENAME flag ensures that it cannot be moved by another 969 * rename. 970 */ 971 if (xp != ip) { 972 if (doingdirectory) 973 panic("ext2fs_rename: lost dir entry"); 974 } else { 975 /* 976 * If the source is a directory with a 977 * new parent, the link count of the old 978 * parent directory must be decremented 979 * and ".." set to point to the new parent. 980 */ 981 if (doingdirectory && newparent) { 982 KASSERT(dp != NULL); 983 dp->i_e2fs_nlink--; 984 dp->i_flag |= IN_CHANGE; 985 error = vn_rdwr(UIO_READ, fvp, (void *)&dirbuf, 986 sizeof (struct ext2fs_dirtemplate), (off_t)0, 987 UIO_SYSSPACE, IO_NODELOCKED, 988 tcnp->cn_cred, (size_t *)0, NULL); 989 if (error == 0) { 990 namlen = dirbuf.dotdot_namlen; 991 if (namlen != 2 || 992 dirbuf.dotdot_name[0] != '.' || 993 dirbuf.dotdot_name[1] != '.') { 994 ufs_dirbad(xp, (doff_t)12, 995 "ext2fs_rename: mangled dir"); 996 } else { 997 dirbuf.dotdot_ino = h2fs32(newparent); 998 (void) vn_rdwr(UIO_WRITE, fvp, 999 (void *)&dirbuf, 1000 sizeof (struct dirtemplate), 1001 (off_t)0, UIO_SYSSPACE, 1002 IO_NODELOCKED|IO_SYNC, 1003 tcnp->cn_cred, (size_t *)0, 1004 NULL); 1005 cache_purge(fdvp); 1006 } 1007 } 1008 } 1009 error = ext2fs_dirremove(fdvp, fcnp); 1010 if (!error) { 1011 xp->i_e2fs_nlink--; 1012 xp->i_flag |= IN_CHANGE; 1013 } 1014 xp->i_flag &= ~IN_RENAME; 1015 } 1016 VN_KNOTE(fvp, NOTE_RENAME); 1017 if (dp) 1018 vput(fdvp); 1019 if (xp) 1020 vput(fvp); 1021 vrele(ap->a_fvp); 1022 return (error); 1023 1024 bad: 1025 if (xp) 1026 vput(ITOV(xp)); 1027 vput(ITOV(dp)); 1028 out: 1029 if (doingdirectory) 1030 ip->i_flag &= ~IN_RENAME; 1031 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1032 ip->i_e2fs_nlink--; 1033 ip->i_flag |= IN_CHANGE; 1034 vput(fvp); 1035 } else 1036 vrele(fvp); 1037 vrele(fdvp); 1038 return (error); 1039 } 1040 1041 /* 1042 * Mkdir system call 1043 */ 1044 int 1045 ext2fs_mkdir(void *v) 1046 { 1047 struct vop_mkdir_args /* { 1048 struct vnode *a_dvp; 1049 struct vnode **a_vpp; 1050 struct componentname *a_cnp; 1051 struct vattr *a_vap; 1052 } */ *ap = v; 1053 struct vnode *dvp = ap->a_dvp; 1054 struct vattr *vap = ap->a_vap; 1055 struct componentname *cnp = ap->a_cnp; 1056 struct inode *ip, *dp = VTOI(dvp); 1057 struct vnode *tvp; 1058 struct ext2fs_dirtemplate dirtemplate; 1059 int error, dmode; 1060 1061 #ifdef DIAGNOSTIC 1062 if ((cnp->cn_flags & HASBUF) == 0) 1063 panic("ext2fs_mkdir: no name"); 1064 #endif 1065 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1066 error = EMLINK; 1067 goto out; 1068 } 1069 dmode = vap->va_mode & ACCESSPERMS; 1070 dmode |= IFDIR; 1071 /* 1072 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1073 * but not have it entered in the parent directory. The entry is 1074 * made later after writing "." and ".." entries. 1075 */ 1076 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1077 goto out; 1078 ip = VTOI(tvp); 1079 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1080 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1081 ip->i_e2fs_gid = dp->i_e2fs_gid; 1082 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1083 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1084 ip->i_e2fs_gid_high = dp->i_e2fs_gid_high; 1085 } else { 1086 ip->i_e2fs_uid_high = 0; 1087 ip->i_e2fs_gid_high = 0; 1088 } 1089 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1090 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1091 ip->i_e2fs_mode = dmode; 1092 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1093 ip->i_e2fs_nlink = 2; 1094 1095 /* 1096 * Bump link count in parent directory 1097 * to reflect work done below. Should 1098 * be done before reference is created 1099 * so reparation is possible if we crash. 1100 */ 1101 dp->i_e2fs_nlink++; 1102 dp->i_flag |= IN_CHANGE; 1103 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1104 goto bad; 1105 1106 /* Initialize directory with "." and ".." from static template. */ 1107 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1108 dirtemplate.dot_ino = h2fs32(ip->i_number); 1109 dirtemplate.dot_reclen = h2fs16(12); 1110 dirtemplate.dot_namlen = 1; 1111 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1112 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1113 dirtemplate.dot_type = EXT2_FT_DIR; 1114 } 1115 dirtemplate.dot_name[0] = '.'; 1116 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1117 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1118 dirtemplate.dotdot_namlen = 2; 1119 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1120 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1121 dirtemplate.dotdot_type = EXT2_FT_DIR; 1122 } 1123 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1124 error = vn_rdwr(UIO_WRITE, tvp, (void *)&dirtemplate, 1125 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1126 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1127 if (error) { 1128 dp->i_e2fs_nlink--; 1129 dp->i_flag |= IN_CHANGE; 1130 goto bad; 1131 } 1132 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1133 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1134 else { 1135 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1136 if (error) { 1137 dp->i_e2fs_nlink--; 1138 dp->i_flag |= IN_CHANGE; 1139 goto bad; 1140 } 1141 ip->i_flag |= IN_CHANGE; 1142 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1143 } 1144 1145 /* Directory set up, now install it's entry in the parent directory. */ 1146 error = ext2fs_direnter(ip, dvp, cnp); 1147 if (error != 0) { 1148 dp->i_e2fs_nlink--; 1149 dp->i_flag |= IN_CHANGE; 1150 } 1151 bad: 1152 /* 1153 * No need to do an explicit ext2fs_truncate here, vrele will do this 1154 * for us because we set the link count to 0. 1155 */ 1156 if (error) { 1157 ip->i_e2fs_nlink = 0; 1158 ip->i_flag |= IN_CHANGE; 1159 vput(tvp); 1160 } else { 1161 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1162 *ap->a_vpp = tvp; 1163 } 1164 out: 1165 PNBUF_PUT(cnp->cn_pnbuf); 1166 vput(dvp); 1167 return (error); 1168 } 1169 1170 /* 1171 * Rmdir system call. 1172 */ 1173 int 1174 ext2fs_rmdir(void *v) 1175 { 1176 struct vop_rmdir_args /* { 1177 struct vnode *a_dvp; 1178 struct vnode *a_vp; 1179 struct componentname *a_cnp; 1180 } */ *ap = v; 1181 struct vnode *vp = ap->a_vp; 1182 struct vnode *dvp = ap->a_dvp; 1183 struct componentname *cnp = ap->a_cnp; 1184 struct inode *ip, *dp; 1185 int error; 1186 1187 ip = VTOI(vp); 1188 dp = VTOI(dvp); 1189 /* 1190 * No rmdir "." please. 1191 */ 1192 if (dp == ip) { 1193 vrele(dvp); 1194 vput(vp); 1195 return (EINVAL); 1196 } 1197 /* 1198 * Verify the directory is empty (and valid). 1199 * (Rmdir ".." won't be valid since 1200 * ".." will contain a reference to 1201 * the current directory and thus be 1202 * non-empty.) 1203 */ 1204 error = 0; 1205 if (ip->i_e2fs_nlink != 2 || 1206 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1207 error = ENOTEMPTY; 1208 goto out; 1209 } 1210 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1211 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1212 error = EPERM; 1213 goto out; 1214 } 1215 /* 1216 * Delete reference to directory before purging 1217 * inode. If we crash in between, the directory 1218 * will be reattached to lost+found, 1219 */ 1220 error = ext2fs_dirremove(dvp, cnp); 1221 if (error != 0) 1222 goto out; 1223 dp->i_e2fs_nlink--; 1224 dp->i_flag |= IN_CHANGE; 1225 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1226 cache_purge(dvp); 1227 vput(dvp); 1228 dvp = NULL; 1229 /* 1230 * Truncate inode. The only stuff left 1231 * in the directory is "." and "..". The 1232 * "." reference is inconsequential since 1233 * we're quashing it. The ".." reference 1234 * has already been adjusted above. We've 1235 * removed the "." reference and the reference 1236 * in the parent directory, but there may be 1237 * other hard links so decrement by 2 and 1238 * worry about them later. 1239 */ 1240 ip->i_e2fs_nlink -= 2; 1241 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred); 1242 cache_purge(ITOV(ip)); 1243 out: 1244 VN_KNOTE(vp, NOTE_DELETE); 1245 if (dvp) 1246 vput(dvp); 1247 vput(vp); 1248 return (error); 1249 } 1250 1251 /* 1252 * symlink -- make a symbolic link 1253 */ 1254 int 1255 ext2fs_symlink(void *v) 1256 { 1257 struct vop_symlink_args /* { 1258 struct vnode *a_dvp; 1259 struct vnode **a_vpp; 1260 struct componentname *a_cnp; 1261 struct vattr *a_vap; 1262 char *a_target; 1263 } */ *ap = v; 1264 struct vnode *vp, **vpp; 1265 struct inode *ip; 1266 int len, error; 1267 1268 vpp = ap->a_vpp; 1269 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1270 vpp, ap->a_cnp); 1271 if (error) 1272 return (error); 1273 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1274 vp = *vpp; 1275 len = strlen(ap->a_target); 1276 ip = VTOI(vp); 1277 if (len < ip->i_ump->um_maxsymlinklen) { 1278 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1279 error = ext2fs_setsize(ip, len); 1280 if (error) 1281 goto bad; 1282 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1283 uvm_vnp_setsize(vp, len); 1284 } else 1285 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1286 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1287 (size_t *)0, NULL); 1288 bad: 1289 if (error) 1290 vput(vp); 1291 return (error); 1292 } 1293 1294 /* 1295 * Return target name of a symbolic link 1296 */ 1297 int 1298 ext2fs_readlink(void *v) 1299 { 1300 struct vop_readlink_args /* { 1301 struct vnode *a_vp; 1302 struct uio *a_uio; 1303 kauth_cred_t a_cred; 1304 } */ *ap = v; 1305 struct vnode *vp = ap->a_vp; 1306 struct inode *ip = VTOI(vp); 1307 struct ufsmount *ump = ip->i_ump; 1308 int isize; 1309 1310 isize = ext2fs_size(ip); 1311 if (isize < ump->um_maxsymlinklen || 1312 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1313 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1314 return (0); 1315 } 1316 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1317 } 1318 1319 /* 1320 * Advisory record locking support 1321 */ 1322 int 1323 ext2fs_advlock(void *v) 1324 { 1325 struct vop_advlock_args /* { 1326 struct vnode *a_vp; 1327 void * a_id; 1328 int a_op; 1329 struct flock *a_fl; 1330 int a_flags; 1331 } */ *ap = v; 1332 struct inode *ip = VTOI(ap->a_vp); 1333 1334 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1335 } 1336 1337 int 1338 ext2fs_fsync(void *v) 1339 { 1340 struct vop_fsync_args /* { 1341 struct vnode *a_vp; 1342 kauth_cred_t a_cred; 1343 int a_flags; 1344 off_t offlo; 1345 off_t offhi; 1346 struct proc *a_p; 1347 } */ *ap = v; 1348 struct vnode *vp = ap->a_vp; 1349 int wait; 1350 int error; 1351 1352 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1353 1354 if (vp->v_type == VBLK) 1355 spec_fsync(v); 1356 else 1357 vflushbuf(vp, wait); 1358 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1359 error = 0; 1360 else 1361 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1362 1363 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1364 int l = 0; 1365 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1366 curlwp->l_cred); 1367 } 1368 1369 return error; 1370 } 1371 1372 /* 1373 * Initialize the vnode associated with a new inode, handle aliased 1374 * vnodes. 1375 */ 1376 int 1377 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1378 int (**fifoops)(void *), struct vnode **vpp) 1379 { 1380 struct timeval tv; 1381 struct inode *ip; 1382 struct vnode *vp; 1383 1384 vp = *vpp; 1385 ip = VTOI(vp); 1386 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1387 case VCHR: 1388 case VBLK: 1389 vp->v_op = specops; 1390 spec_node_init(vp, fs2h32(ip->i_din.e2fs_din->e2di_rdev)); 1391 break; 1392 case VFIFO: 1393 vp->v_op = fifoops; 1394 break; 1395 case VNON: 1396 case VBAD: 1397 case VSOCK: 1398 case VLNK: 1399 case VDIR: 1400 case VREG: 1401 break; 1402 } 1403 if (ip->i_number == ROOTINO) 1404 vp->v_vflag |= VV_ROOT; 1405 /* 1406 * Initialize modrev times 1407 */ 1408 getmicrouptime(&tv); 1409 SETHIGH(ip->i_modrev, tv.tv_sec); 1410 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1411 *vpp = vp; 1412 return (0); 1413 } 1414 1415 /* 1416 * Allocate a new inode. 1417 */ 1418 int 1419 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1420 struct componentname *cnp) 1421 { 1422 struct inode *ip, *pdir; 1423 struct vnode *tvp; 1424 int error, ismember = 0; 1425 1426 pdir = VTOI(dvp); 1427 #ifdef DIAGNOSTIC 1428 if ((cnp->cn_flags & HASBUF) == 0) 1429 panic("ext2fs_makeinode: no name"); 1430 #endif 1431 *vpp = NULL; 1432 if ((mode & IFMT) == 0) 1433 mode |= IFREG; 1434 1435 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1436 PNBUF_PUT(cnp->cn_pnbuf); 1437 vput(dvp); 1438 return (error); 1439 } 1440 ip = VTOI(tvp); 1441 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1442 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1443 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1444 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1445 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1446 ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high; 1447 } else { 1448 ip->i_e2fs_uid_high = 0; 1449 ip->i_e2fs_gid_high = 0; 1450 } 1451 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1452 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1453 ip->i_e2fs_mode = mode; 1454 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1455 ip->i_e2fs_nlink = 1; 1456 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1457 ip->i_gid, &ismember) != 0 || !ismember) && 1458 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1459 ip->i_e2fs_mode &= ~ISGID; 1460 1461 /* 1462 * Make sure inode goes to disk before directory entry. 1463 */ 1464 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1465 goto bad; 1466 error = ext2fs_direnter(ip, dvp, cnp); 1467 if (error != 0) 1468 goto bad; 1469 if ((cnp->cn_flags & SAVESTART) == 0) 1470 PNBUF_PUT(cnp->cn_pnbuf); 1471 vput(dvp); 1472 *vpp = tvp; 1473 return (0); 1474 1475 bad: 1476 /* 1477 * Write error occurred trying to update the inode 1478 * or the directory so must deallocate the inode. 1479 */ 1480 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1481 ip->i_e2fs_nlink = 0; 1482 ip->i_flag |= IN_CHANGE; 1483 vput(tvp); 1484 PNBUF_PUT(cnp->cn_pnbuf); 1485 vput(dvp); 1486 return (error); 1487 } 1488 1489 /* 1490 * Reclaim an inode so that it can be used for other purposes. 1491 */ 1492 int 1493 ext2fs_reclaim(void *v) 1494 { 1495 struct vop_reclaim_args /* { 1496 struct vnode *a_vp; 1497 } */ *ap = v; 1498 struct vnode *vp = ap->a_vp; 1499 struct inode *ip = VTOI(vp); 1500 int error; 1501 1502 if ((error = ufs_reclaim(vp)) != 0) 1503 return (error); 1504 if (ip->i_din.e2fs_din != NULL) 1505 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1506 genfs_node_destroy(vp); 1507 pool_put(&ext2fs_inode_pool, vp->v_data); 1508 vp->v_data = NULL; 1509 return (0); 1510 } 1511 1512 /* Global vfs data structures for ext2fs. */ 1513 int (**ext2fs_vnodeop_p)(void *); 1514 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1515 { &vop_default_desc, vn_default_error }, 1516 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1517 { &vop_create_desc, ext2fs_create }, /* create */ 1518 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1519 { &vop_open_desc, ext2fs_open }, /* open */ 1520 { &vop_close_desc, ufs_close }, /* close */ 1521 { &vop_access_desc, ext2fs_access }, /* access */ 1522 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1523 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1524 { &vop_read_desc, ext2fs_read }, /* read */ 1525 { &vop_write_desc, ext2fs_write }, /* write */ 1526 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1527 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1528 { &vop_poll_desc, ufs_poll }, /* poll */ 1529 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1530 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1531 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1532 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1533 { &vop_seek_desc, ufs_seek }, /* seek */ 1534 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1535 { &vop_link_desc, ext2fs_link }, /* link */ 1536 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1537 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1538 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1539 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1540 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1541 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1542 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1543 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1544 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1545 { &vop_lock_desc, ufs_lock }, /* lock */ 1546 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1547 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1548 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1549 { &vop_print_desc, ufs_print }, /* print */ 1550 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1551 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1552 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1553 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1554 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1555 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1556 { NULL, NULL } 1557 }; 1558 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1559 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1560 1561 int (**ext2fs_specop_p)(void *); 1562 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1563 { &vop_default_desc, vn_default_error }, 1564 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1565 { &vop_create_desc, spec_create }, /* create */ 1566 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1567 { &vop_open_desc, spec_open }, /* open */ 1568 { &vop_close_desc, ufsspec_close }, /* close */ 1569 { &vop_access_desc, ext2fs_access }, /* access */ 1570 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1571 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1572 { &vop_read_desc, ufsspec_read }, /* read */ 1573 { &vop_write_desc, ufsspec_write }, /* write */ 1574 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1575 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1576 { &vop_poll_desc, spec_poll }, /* poll */ 1577 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1578 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1579 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1580 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1581 { &vop_seek_desc, spec_seek }, /* seek */ 1582 { &vop_remove_desc, spec_remove }, /* remove */ 1583 { &vop_link_desc, spec_link }, /* link */ 1584 { &vop_rename_desc, spec_rename }, /* rename */ 1585 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1586 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1587 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1588 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1589 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1590 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1591 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1592 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1593 { &vop_lock_desc, ufs_lock }, /* lock */ 1594 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1595 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1596 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1597 { &vop_print_desc, ufs_print }, /* print */ 1598 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1599 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1600 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1601 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1602 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1603 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1604 { NULL, NULL } 1605 }; 1606 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1607 { &ext2fs_specop_p, ext2fs_specop_entries }; 1608 1609 int (**ext2fs_fifoop_p)(void *); 1610 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1611 { &vop_default_desc, vn_default_error }, 1612 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1613 { &vop_create_desc, fifo_create }, /* create */ 1614 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1615 { &vop_open_desc, fifo_open }, /* open */ 1616 { &vop_close_desc, ufsfifo_close }, /* close */ 1617 { &vop_access_desc, ext2fs_access }, /* access */ 1618 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1619 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1620 { &vop_read_desc, ufsfifo_read }, /* read */ 1621 { &vop_write_desc, ufsfifo_write }, /* write */ 1622 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1623 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1624 { &vop_poll_desc, fifo_poll }, /* poll */ 1625 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1626 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1627 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1628 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1629 { &vop_seek_desc, fifo_seek }, /* seek */ 1630 { &vop_remove_desc, fifo_remove }, /* remove */ 1631 { &vop_link_desc, fifo_link }, /* link */ 1632 { &vop_rename_desc, fifo_rename }, /* rename */ 1633 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1634 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1635 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1636 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1637 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1638 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1639 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1640 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1641 { &vop_lock_desc, ufs_lock }, /* lock */ 1642 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1643 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1644 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1645 { &vop_print_desc, ufs_print }, /* print */ 1646 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1647 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1648 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1649 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1650 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1651 { NULL, NULL } 1652 }; 1653 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1654 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1655
Indexes created Mon Sep 29 21:09:56 GMT 2025