ext2fs_vnops.c revision 1.73
1 /* $NetBSD: ext2fs_vnops.c,v 1.73 2007/02/20 16:21:04 ad 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 1.73 2007/02/20 16:21:04 ad Exp $"); 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/resourcevar.h> 78 #include <sys/kernel.h> 79 #include <sys/file.h> 80 #include <sys/stat.h> 81 #include <sys/buf.h> 82 #include <sys/proc.h> 83 #include <sys/mount.h> 84 #include <sys/namei.h> 85 #include <sys/vnode.h> 86 #include <sys/lockf.h> 87 #include <sys/malloc.h> 88 #include <sys/pool.h> 89 #include <sys/signalvar.h> 90 #include <sys/kauth.h> 91 92 #include <miscfs/fifofs/fifo.h> 93 #include <miscfs/genfs/genfs.h> 94 #include <miscfs/specfs/specdev.h> 95 96 #include <ufs/ufs/inode.h> 97 #include <ufs/ufs/ufs_extern.h> 98 #include <ufs/ufs/ufsmount.h> 99 100 #include <ufs/ext2fs/ext2fs.h> 101 #include <ufs/ext2fs/ext2fs_extern.h> 102 #include <ufs/ext2fs/ext2fs_dir.h> 103 104 extern int prtactive; 105 106 static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *); 107 static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 108 struct lwp *); 109 110 union _qcvt { 111 int64_t qcvt; 112 int32_t val[2]; 113 }; 114 115 #define SETHIGH(q, h) { \ 116 union _qcvt tmp; \ 117 tmp.qcvt = (q); \ 118 tmp.val[_QUAD_HIGHWORD] = (h); \ 119 (q) = tmp.qcvt; \ 120 } 121 #define SETLOW(q, l) { \ 122 union _qcvt tmp; \ 123 tmp.qcvt = (q); \ 124 tmp.val[_QUAD_LOWWORD] = (l); \ 125 (q) = tmp.qcvt; \ 126 } 127 128 /* 129 * Create a regular file 130 */ 131 int 132 ext2fs_create(void *v) 133 { 134 struct vop_create_args /* { 135 struct vnode *a_dvp; 136 struct vnode **a_vpp; 137 struct componentname *a_cnp; 138 struct vattr *a_vap; 139 } */ *ap = v; 140 int error; 141 142 error = 143 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 144 ap->a_dvp, ap->a_vpp, ap->a_cnp); 145 146 if (error) 147 return (error); 148 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 149 return (0); 150 } 151 152 /* 153 * Mknod vnode call 154 */ 155 /* ARGSUSED */ 156 int 157 ext2fs_mknod(void *v) 158 { 159 struct vop_mknod_args /* { 160 struct vnode *a_dvp; 161 struct vnode **a_vpp; 162 struct componentname *a_cnp; 163 struct vattr *a_vap; 164 } */ *ap = v; 165 struct vattr *vap = ap->a_vap; 166 struct vnode **vpp = ap->a_vpp; 167 struct inode *ip; 168 int error; 169 struct mount *mp; 170 ino_t ino; 171 172 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 173 ap->a_dvp, vpp, ap->a_cnp)) != 0) 174 return (error); 175 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 176 ip = VTOI(*vpp); 177 mp = (*vpp)->v_mount; 178 ino = ip->i_number; 179 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 180 if (vap->va_rdev != VNOVAL) { 181 /* 182 * Want to be able to use this to make badblock 183 * inodes, so don't truncate the dev number. 184 */ 185 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 186 } 187 /* 188 * Remove inode so that it will be reloaded by VFS_VGET and 189 * checked to see if it is an alias of an existing entry in 190 * the inode cache. 191 */ 192 vput(*vpp); 193 (*vpp)->v_type = VNON; 194 vgone(*vpp); 195 error = VFS_VGET(mp, ino, vpp); 196 if (error != 0) { 197 *vpp = NULL; 198 return (error); 199 } 200 return (0); 201 } 202 203 /* 204 * Open called. 205 * 206 * Just check the APPEND flag. 207 */ 208 /* ARGSUSED */ 209 int 210 ext2fs_open(void *v) 211 { 212 struct vop_open_args /* { 213 struct vnode *a_vp; 214 int a_mode; 215 kauth_cred_t a_cred; 216 struct lwp *a_l; 217 } */ *ap = v; 218 219 /* 220 * Files marked append-only must be opened for appending. 221 */ 222 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 223 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 224 return (EPERM); 225 return (0); 226 } 227 228 int 229 ext2fs_access(void *v) 230 { 231 struct vop_access_args /* { 232 struct vnode *a_vp; 233 int a_mode; 234 kauth_cred_t a_cred; 235 struct lwp *a_l; 236 } */ *ap = v; 237 struct vnode *vp = ap->a_vp; 238 struct inode *ip = VTOI(vp); 239 mode_t mode = ap->a_mode; 240 241 /* 242 * Disallow write attempts on read-only file systems; 243 * unless the file is a socket, fifo, or a block or 244 * character device resident on the file system. 245 */ 246 if (mode & VWRITE) { 247 switch (vp->v_type) { 248 case VDIR: 249 case VLNK: 250 case VREG: 251 if (vp->v_mount->mnt_flag & MNT_RDONLY) 252 return (EROFS); 253 break; 254 default: 255 break; 256 } 257 } 258 259 /* If immutable bit set, nobody gets to write it. */ 260 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 261 return (EPERM); 262 263 return (vaccess(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 264 ip->i_e2fs_uid, ip->i_e2fs_gid, mode, ap->a_cred)); 265 } 266 267 /* ARGSUSED */ 268 int 269 ext2fs_getattr(void *v) 270 { 271 struct vop_getattr_args /* { 272 struct vnode *a_vp; 273 struct vattr *a_vap; 274 kauth_cred_t a_cred; 275 struct lwp *a_l; 276 } */ *ap = v; 277 struct vnode *vp = ap->a_vp; 278 struct inode *ip = VTOI(vp); 279 struct vattr *vap = ap->a_vap; 280 281 EXT2FS_ITIMES(ip, NULL, NULL, NULL); 282 /* 283 * Copy from inode table 284 */ 285 vap->va_fsid = ip->i_dev; 286 vap->va_fileid = ip->i_number; 287 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 288 vap->va_nlink = ip->i_e2fs_nlink; 289 vap->va_uid = ip->i_e2fs_uid; 290 vap->va_gid = ip->i_e2fs_gid; 291 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 292 vap->va_size = vp->v_size; 293 vap->va_atime.tv_sec = ip->i_e2fs_atime; 294 vap->va_atime.tv_nsec = 0; 295 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 296 vap->va_mtime.tv_nsec = 0; 297 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 298 vap->va_ctime.tv_nsec = 0; 299 #ifdef EXT2FS_SYSTEM_FLAGS 300 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 301 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 302 #else 303 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 304 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 305 #endif 306 vap->va_gen = ip->i_e2fs_gen; 307 /* this doesn't belong here */ 308 if (vp->v_type == VBLK) 309 vap->va_blocksize = BLKDEV_IOSIZE; 310 else if (vp->v_type == VCHR) 311 vap->va_blocksize = MAXBSIZE; 312 else 313 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 314 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 315 vap->va_type = vp->v_type; 316 vap->va_filerev = ip->i_modrev; 317 return (0); 318 } 319 320 /* 321 * Set attribute vnode op. called from several syscalls 322 */ 323 int 324 ext2fs_setattr(void *v) 325 { 326 struct vop_setattr_args /* { 327 struct vnode *a_vp; 328 struct vattr *a_vap; 329 kauth_cred_t a_cred; 330 struct lwp *a_l; 331 } */ *ap = v; 332 struct vattr *vap = ap->a_vap; 333 struct vnode *vp = ap->a_vp; 334 struct inode *ip = VTOI(vp); 335 kauth_cred_t cred = ap->a_cred; 336 struct lwp *l = ap->a_l; 337 int error; 338 339 /* 340 * Check for unsettable attributes. 341 */ 342 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 343 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 344 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 345 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 346 return (EINVAL); 347 } 348 if (vap->va_flags != VNOVAL) { 349 if (vp->v_mount->mnt_flag & MNT_RDONLY) 350 return (EROFS); 351 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 352 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 353 NULL))) 354 return (error); 355 #ifdef EXT2FS_SYSTEM_FLAGS 356 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 357 NULL) == 0) { 358 if ((ip->i_e2fs_flags & 359 (EXT2_APPEND | EXT2_IMMUTABLE)) && 360 kauth_authorize_system(l->l_cred, 361 KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL)) 362 return (EPERM); 363 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 364 ip->i_e2fs_flags |= 365 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 366 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 367 } else 368 return (EPERM); 369 #else 370 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 371 ip->i_e2fs_flags |= 372 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 373 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 374 #endif 375 ip->i_flag |= IN_CHANGE; 376 if (vap->va_flags & (IMMUTABLE | APPEND)) 377 return (0); 378 } 379 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 380 return (EPERM); 381 /* 382 * Go through the fields and update iff not VNOVAL. 383 */ 384 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 385 if (vp->v_mount->mnt_flag & MNT_RDONLY) 386 return (EROFS); 387 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 388 if (error) 389 return (error); 390 } 391 if (vap->va_size != VNOVAL) { 392 /* 393 * Disallow write attempts on read-only file systems; 394 * unless the file is a socket, fifo, or a block or 395 * character device resident on the file system. 396 */ 397 switch (vp->v_type) { 398 case VDIR: 399 return (EISDIR); 400 case VLNK: 401 case VREG: 402 if (vp->v_mount->mnt_flag & MNT_RDONLY) 403 return (EROFS); 404 default: 405 break; 406 } 407 error = ext2fs_truncate(vp, vap->va_size, 0, cred, l->l_proc); 408 if (error) 409 return (error); 410 } 411 ip = VTOI(vp); 412 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 413 if (vp->v_mount->mnt_flag & MNT_RDONLY) 414 return (EROFS); 415 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 416 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 417 NULL)) && 418 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 419 (error = VOP_ACCESS(vp, VWRITE, cred, l)))) 420 return (error); 421 if (vap->va_atime.tv_sec != VNOVAL) 422 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 423 ip->i_flag |= IN_ACCESS; 424 if (vap->va_mtime.tv_sec != VNOVAL) 425 ip->i_flag |= IN_CHANGE | IN_UPDATE; 426 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 427 UPDATE_WAIT); 428 if (error) 429 return (error); 430 } 431 error = 0; 432 if (vap->va_mode != (mode_t)VNOVAL) { 433 if (vp->v_mount->mnt_flag & MNT_RDONLY) 434 return (EROFS); 435 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l); 436 } 437 VN_KNOTE(vp, NOTE_ATTRIB); 438 return (error); 439 } 440 441 /* 442 * Change the mode on a file. 443 * Inode must be locked before calling. 444 */ 445 static int 446 ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l) 447 { 448 struct inode *ip = VTOI(vp); 449 int error, ismember = 0; 450 451 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 452 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 453 NULL))) 454 return (error); 455 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL)) { 456 if (vp->v_type != VDIR && (mode & S_ISTXT)) 457 return (EFTYPE); 458 if ((kauth_cred_ismember_gid(cred, ip->i_e2fs_gid, &ismember) != 0 || 459 !ismember) && (mode & ISGID)) 460 return (EPERM); 461 } 462 ip->i_e2fs_mode &= ~ALLPERMS; 463 ip->i_e2fs_mode |= (mode & ALLPERMS); 464 ip->i_flag |= IN_CHANGE; 465 return (0); 466 } 467 468 /* 469 * Perform chown operation on inode ip; 470 * inode must be locked prior to call. 471 */ 472 static int 473 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 474 struct lwp *l) 475 { 476 struct inode *ip = VTOI(vp); 477 uid_t ouid; 478 gid_t ogid; 479 int error = 0, ismember = 0; 480 481 if (uid == (uid_t)VNOVAL) 482 uid = ip->i_e2fs_uid; 483 if (gid == (gid_t)VNOVAL) 484 gid = ip->i_e2fs_gid; 485 /* 486 * If we don't own the file, are trying to change the owner 487 * of the file, or are not a member of the target group, 488 * the caller must be superuser or the call fails. 489 */ 490 if ((kauth_cred_geteuid(cred) != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 491 (gid != ip->i_e2fs_gid && 492 !(kauth_cred_getegid(cred) == gid || 493 (kauth_cred_ismember_gid(cred, gid, &ismember) == 0 && ismember)))) && 494 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL))) 495 return (error); 496 ogid = ip->i_e2fs_gid; 497 ouid = ip->i_e2fs_uid; 498 499 ip->i_e2fs_gid = gid; 500 ip->i_e2fs_uid = uid; 501 if (ouid != uid || ogid != gid) 502 ip->i_flag |= IN_CHANGE; 503 if (ouid != uid && kauth_authorize_generic(cred, 504 KAUTH_GENERIC_ISSUSER, NULL) != 0) 505 ip->i_e2fs_mode &= ~ISUID; 506 if (ogid != gid && kauth_authorize_generic(cred, 507 KAUTH_GENERIC_ISSUSER, NULL) != 0) 508 ip->i_e2fs_mode &= ~ISGID; 509 return (0); 510 } 511 512 int 513 ext2fs_remove(void *v) 514 { 515 struct vop_remove_args /* { 516 struct vnode *a_dvp; 517 struct vnode *a_vp; 518 struct componentname *a_cnp; 519 } */ *ap = v; 520 struct inode *ip; 521 struct vnode *vp = ap->a_vp; 522 struct vnode *dvp = ap->a_dvp; 523 int error; 524 525 ip = VTOI(vp); 526 if (vp->v_type == VDIR || 527 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 528 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 529 error = EPERM; 530 } else { 531 error = ext2fs_dirremove(dvp, ap->a_cnp); 532 if (error == 0) { 533 ip->i_e2fs_nlink--; 534 ip->i_flag |= IN_CHANGE; 535 } 536 } 537 538 VN_KNOTE(vp, NOTE_DELETE); 539 VN_KNOTE(dvp, NOTE_WRITE); 540 if (dvp == vp) 541 vrele(vp); 542 else 543 vput(vp); 544 vput(dvp); 545 return (error); 546 } 547 548 /* 549 * link vnode call 550 */ 551 int 552 ext2fs_link(void *v) 553 { 554 struct vop_link_args /* { 555 struct vnode *a_dvp; 556 struct vnode *a_vp; 557 struct componentname *a_cnp; 558 } */ *ap = v; 559 struct vnode *dvp = ap->a_dvp; 560 struct vnode *vp = ap->a_vp; 561 struct componentname *cnp = ap->a_cnp; 562 struct inode *ip; 563 int error; 564 565 #ifdef DIAGNOSTIC 566 if ((cnp->cn_flags & HASBUF) == 0) 567 panic("ext2fs_link: no name"); 568 #endif 569 if (vp->v_type == VDIR) { 570 VOP_ABORTOP(dvp, cnp); 571 error = EISDIR; 572 goto out2; 573 } 574 if (dvp->v_mount != vp->v_mount) { 575 VOP_ABORTOP(dvp, cnp); 576 error = EXDEV; 577 goto out2; 578 } 579 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 580 VOP_ABORTOP(dvp, cnp); 581 goto out2; 582 } 583 ip = VTOI(vp); 584 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 585 VOP_ABORTOP(dvp, cnp); 586 error = EMLINK; 587 goto out1; 588 } 589 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 590 VOP_ABORTOP(dvp, cnp); 591 error = EPERM; 592 goto out1; 593 } 594 ip->i_e2fs_nlink++; 595 ip->i_flag |= IN_CHANGE; 596 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 597 if (!error) 598 error = ext2fs_direnter(ip, dvp, cnp); 599 if (error) { 600 ip->i_e2fs_nlink--; 601 ip->i_flag |= IN_CHANGE; 602 } 603 PNBUF_PUT(cnp->cn_pnbuf); 604 out1: 605 if (dvp != vp) 606 VOP_UNLOCK(vp, 0); 607 out2: 608 VN_KNOTE(vp, NOTE_LINK); 609 VN_KNOTE(dvp, NOTE_WRITE); 610 vput(dvp); 611 return (error); 612 } 613 614 /* 615 * Rename system call. 616 * rename("foo", "bar"); 617 * is essentially 618 * unlink("bar"); 619 * link("foo", "bar"); 620 * unlink("foo"); 621 * but ``atomically''. Can't do full commit without saving state in the 622 * inode on disk which isn't feasible at this time. Best we can do is 623 * always guarantee the target exists. 624 * 625 * Basic algorithm is: 626 * 627 * 1) Bump link count on source while we're linking it to the 628 * target. This also ensure the inode won't be deleted out 629 * from underneath us while we work (it may be truncated by 630 * a concurrent `trunc' or `open' for creation). 631 * 2) Link source to destination. If destination already exists, 632 * delete it first. 633 * 3) Unlink source reference to inode if still around. If a 634 * directory was moved and the parent of the destination 635 * is different from the source, patch the ".." entry in the 636 * directory. 637 */ 638 int 639 ext2fs_rename(void *v) 640 { 641 struct vop_rename_args /* { 642 struct vnode *a_fdvp; 643 struct vnode *a_fvp; 644 struct componentname *a_fcnp; 645 struct vnode *a_tdvp; 646 struct vnode *a_tvp; 647 struct componentname *a_tcnp; 648 } */ *ap = v; 649 struct vnode *tvp = ap->a_tvp; 650 struct vnode *tdvp = ap->a_tdvp; 651 struct vnode *fvp = ap->a_fvp; 652 struct vnode *fdvp = ap->a_fdvp; 653 struct componentname *tcnp = ap->a_tcnp; 654 struct componentname *fcnp = ap->a_fcnp; 655 struct inode *ip, *xp, *dp; 656 struct ext2fs_dirtemplate dirbuf; 657 int doingdirectory = 0, oldparent = 0, newparent = 0; 658 int error = 0; 659 u_char namlen; 660 661 #ifdef DIAGNOSTIC 662 if ((tcnp->cn_flags & HASBUF) == 0 || 663 (fcnp->cn_flags & HASBUF) == 0) 664 panic("ext2fs_rename: no name"); 665 #endif 666 /* 667 * Check for cross-device rename. 668 */ 669 if ((fvp->v_mount != tdvp->v_mount) || 670 (tvp && (fvp->v_mount != tvp->v_mount))) { 671 error = EXDEV; 672 abortit: 673 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 674 if (tdvp == tvp) 675 vrele(tdvp); 676 else 677 vput(tdvp); 678 if (tvp) 679 vput(tvp); 680 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 681 vrele(fdvp); 682 vrele(fvp); 683 return (error); 684 } 685 686 /* 687 * Check if just deleting a link name. 688 */ 689 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 690 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 691 error = EPERM; 692 goto abortit; 693 } 694 if (fvp == tvp) { 695 if (fvp->v_type == VDIR) { 696 error = EINVAL; 697 goto abortit; 698 } 699 700 /* Release destination completely. */ 701 VOP_ABORTOP(tdvp, tcnp); 702 vput(tdvp); 703 vput(tvp); 704 705 /* Delete source. */ 706 vrele(fvp); 707 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 708 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 709 fcnp->cn_nameiop = DELETE; 710 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 711 if ((error = relookup(fdvp, &fvp, fcnp))) { 712 vput(fdvp); 713 return (error); 714 } 715 return (VOP_REMOVE(fdvp, fvp, fcnp)); 716 } 717 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 718 goto abortit; 719 dp = VTOI(fdvp); 720 ip = VTOI(fvp); 721 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 722 VOP_UNLOCK(fvp, 0); 723 error = EMLINK; 724 goto abortit; 725 } 726 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 727 (dp->i_e2fs_flags & EXT2_APPEND)) { 728 VOP_UNLOCK(fvp, 0); 729 error = EPERM; 730 goto abortit; 731 } 732 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 733 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 734 if (!error && tvp) 735 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, 736 tcnp->cn_lwp); 737 if (error) { 738 VOP_UNLOCK(fvp, 0); 739 error = EACCES; 740 goto abortit; 741 } 742 /* 743 * Avoid ".", "..", and aliases of "." for obvious reasons. 744 */ 745 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 746 dp == ip || 747 (fcnp->cn_flags & ISDOTDOT) || 748 (tcnp->cn_flags & ISDOTDOT) || 749 (ip->i_flag & IN_RENAME)) { 750 VOP_UNLOCK(fvp, 0); 751 error = EINVAL; 752 goto abortit; 753 } 754 ip->i_flag |= IN_RENAME; 755 oldparent = dp->i_number; 756 doingdirectory = 1; 757 } 758 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 759 760 /* 761 * When the target exists, both the directory 762 * and target vnodes are returned locked. 763 */ 764 dp = VTOI(tdvp); 765 xp = NULL; 766 if (tvp) 767 xp = VTOI(tvp); 768 769 /* 770 * 1) Bump link count while we're moving stuff 771 * around. If we crash somewhere before 772 * completing our work, the link count 773 * may be wrong, but correctable. 774 */ 775 ip->i_e2fs_nlink++; 776 ip->i_flag |= IN_CHANGE; 777 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 778 VOP_UNLOCK(fvp, 0); 779 goto bad; 780 } 781 782 /* 783 * If ".." must be changed (ie the directory gets a new 784 * parent) then the source directory must not be in the 785 * directory hierarchy above the target, as this would 786 * orphan everything below the source directory. Also 787 * the user must have write permission in the source so 788 * as to be able to change "..". We must repeat the call 789 * to namei, as the parent directory is unlocked by the 790 * call to checkpath(). 791 */ 792 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 793 VOP_UNLOCK(fvp, 0); 794 if (oldparent != dp->i_number) 795 newparent = dp->i_number; 796 if (doingdirectory && newparent) { 797 if (error) /* write access check above */ 798 goto bad; 799 if (xp != NULL) 800 vput(tvp); 801 vref(tdvp); /* compensate for the ref checkpath loses */ 802 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 803 if (error != 0) { 804 vrele(tdvp); 805 goto out; 806 } 807 tcnp->cn_flags &= ~SAVESTART; 808 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 809 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) { 810 vput(tdvp); 811 goto out; 812 } 813 dp = VTOI(tdvp); 814 xp = NULL; 815 if (tvp) 816 xp = VTOI(tvp); 817 } 818 /* 819 * 2) If target doesn't exist, link the target 820 * to the source and unlink the source. 821 * Otherwise, rewrite the target directory 822 * entry to reference the source inode and 823 * expunge the original entry's existence. 824 */ 825 if (xp == NULL) { 826 if (dp->i_dev != ip->i_dev) 827 panic("rename: EXDEV"); 828 /* 829 * Account for ".." in new directory. 830 * When source and destination have the same 831 * parent we don't fool with the link count. 832 */ 833 if (doingdirectory && newparent) { 834 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 835 error = EMLINK; 836 goto bad; 837 } 838 dp->i_e2fs_nlink++; 839 dp->i_flag |= IN_CHANGE; 840 if ((error = ext2fs_update(tdvp, NULL, NULL, 841 UPDATE_WAIT)) != 0) 842 goto bad; 843 } 844 error = ext2fs_direnter(ip, tdvp, tcnp); 845 if (error != 0) { 846 if (doingdirectory && newparent) { 847 dp->i_e2fs_nlink--; 848 dp->i_flag |= IN_CHANGE; 849 (void)ext2fs_update(tdvp, NULL, NULL, 850 UPDATE_WAIT); 851 } 852 goto bad; 853 } 854 VN_KNOTE(tdvp, NOTE_WRITE); 855 vput(tdvp); 856 } else { 857 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 858 panic("rename: EXDEV"); 859 /* 860 * Short circuit rename(foo, foo). 861 */ 862 if (xp->i_number == ip->i_number) 863 panic("rename: same file"); 864 /* 865 * If the parent directory is "sticky", then the user must 866 * own the parent directory, or the destination of the rename, 867 * otherwise the destination may not be changed (except by 868 * root). This implements append-only directories. 869 */ 870 if ((dp->i_e2fs_mode & S_ISTXT) && 871 kauth_authorize_generic(tcnp->cn_cred, 872 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 873 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_e2fs_uid && 874 xp->i_e2fs_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 875 error = EPERM; 876 goto bad; 877 } 878 /* 879 * Target must be empty if a directory and have no links 880 * to it. Also, ensure source and target are compatible 881 * (both directories, or both not directories). 882 */ 883 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 884 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 885 xp->i_e2fs_nlink > 2) { 886 error = ENOTEMPTY; 887 goto bad; 888 } 889 if (!doingdirectory) { 890 error = ENOTDIR; 891 goto bad; 892 } 893 cache_purge(tdvp); 894 } else if (doingdirectory) { 895 error = EISDIR; 896 goto bad; 897 } 898 error = ext2fs_dirrewrite(dp, ip, tcnp); 899 if (error != 0) 900 goto bad; 901 /* 902 * If the target directory is in the same 903 * directory as the source directory, 904 * decrement the link count on the parent 905 * of the target directory. 906 */ 907 if (doingdirectory && !newparent) { 908 dp->i_e2fs_nlink--; 909 dp->i_flag |= IN_CHANGE; 910 } 911 /* 912 * Adjust the link count of the target to 913 * reflect the dirrewrite above. If this is 914 * a directory it is empty and there are 915 * no links to it, so we can squash the inode and 916 * any space associated with it. We disallowed 917 * renaming over top of a directory with links to 918 * it above, as the remaining link would point to 919 * a directory without "." or ".." entries. 920 */ 921 xp->i_e2fs_nlink--; 922 if (doingdirectory) { 923 if (--xp->i_e2fs_nlink != 0) 924 panic("rename: linked directory"); 925 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 926 tcnp->cn_cred, tcnp->cn_lwp->l_proc); 927 } 928 xp->i_flag |= IN_CHANGE; 929 VN_KNOTE(tdvp, NOTE_WRITE); 930 vput(tdvp); 931 VN_KNOTE(tvp, NOTE_DELETE); 932 vput(tvp); 933 xp = NULL; 934 } 935 936 /* 937 * 3) Unlink the source. 938 */ 939 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 940 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 941 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 942 if ((error = relookup(fdvp, &fvp, fcnp))) { 943 vput(fdvp); 944 vrele(ap->a_fvp); 945 return (error); 946 } 947 if (fvp != NULL) { 948 xp = VTOI(fvp); 949 dp = VTOI(fdvp); 950 } else { 951 /* 952 * From name has disappeared. 953 */ 954 if (doingdirectory) 955 panic("ext2fs_rename: lost dir entry"); 956 vrele(ap->a_fvp); 957 return (0); 958 } 959 /* 960 * Ensure that the directory entry still exists and has not 961 * changed while the new name has been entered. If the source is 962 * a file then the entry may have been unlinked or renamed. In 963 * either case there is no further work to be done. If the source 964 * is a directory then it cannot have been rmdir'ed; its link 965 * count of three would cause a rmdir to fail with ENOTEMPTY. 966 * The IRENAME flag ensures that it cannot be moved by another 967 * rename. 968 */ 969 if (xp != ip) { 970 if (doingdirectory) 971 panic("ext2fs_rename: lost dir entry"); 972 } else { 973 /* 974 * If the source is a directory with a 975 * new parent, the link count of the old 976 * parent directory must be decremented 977 * and ".." set to point to the new parent. 978 */ 979 if (doingdirectory && newparent) { 980 KASSERT(dp != NULL); 981 dp->i_e2fs_nlink--; 982 dp->i_flag |= IN_CHANGE; 983 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 984 sizeof (struct ext2fs_dirtemplate), (off_t)0, 985 UIO_SYSSPACE, IO_NODELOCKED, 986 tcnp->cn_cred, (size_t *)0, NULL); 987 if (error == 0) { 988 namlen = dirbuf.dotdot_namlen; 989 if (namlen != 2 || 990 dirbuf.dotdot_name[0] != '.' || 991 dirbuf.dotdot_name[1] != '.') { 992 ufs_dirbad(xp, (doff_t)12, 993 "ext2fs_rename: mangled dir"); 994 } else { 995 dirbuf.dotdot_ino = h2fs32(newparent); 996 (void) vn_rdwr(UIO_WRITE, fvp, 997 (caddr_t)&dirbuf, 998 sizeof (struct dirtemplate), 999 (off_t)0, UIO_SYSSPACE, 1000 IO_NODELOCKED|IO_SYNC, 1001 tcnp->cn_cred, (size_t *)0, 1002 NULL); 1003 cache_purge(fdvp); 1004 } 1005 } 1006 } 1007 error = ext2fs_dirremove(fdvp, fcnp); 1008 if (!error) { 1009 xp->i_e2fs_nlink--; 1010 xp->i_flag |= IN_CHANGE; 1011 } 1012 xp->i_flag &= ~IN_RENAME; 1013 } 1014 VN_KNOTE(fvp, NOTE_RENAME); 1015 if (dp) 1016 vput(fdvp); 1017 if (xp) 1018 vput(fvp); 1019 vrele(ap->a_fvp); 1020 return (error); 1021 1022 bad: 1023 if (xp) 1024 vput(ITOV(xp)); 1025 vput(ITOV(dp)); 1026 out: 1027 if (doingdirectory) 1028 ip->i_flag &= ~IN_RENAME; 1029 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1030 ip->i_e2fs_nlink--; 1031 ip->i_flag |= IN_CHANGE; 1032 vput(fvp); 1033 } else 1034 vrele(fvp); 1035 vrele(fdvp); 1036 return (error); 1037 } 1038 1039 /* 1040 * Mkdir system call 1041 */ 1042 int 1043 ext2fs_mkdir(void *v) 1044 { 1045 struct vop_mkdir_args /* { 1046 struct vnode *a_dvp; 1047 struct vnode **a_vpp; 1048 struct componentname *a_cnp; 1049 struct vattr *a_vap; 1050 } */ *ap = v; 1051 struct vnode *dvp = ap->a_dvp; 1052 struct vattr *vap = ap->a_vap; 1053 struct componentname *cnp = ap->a_cnp; 1054 struct inode *ip, *dp = VTOI(dvp); 1055 struct vnode *tvp; 1056 struct ext2fs_dirtemplate dirtemplate; 1057 int error, dmode; 1058 1059 #ifdef DIAGNOSTIC 1060 if ((cnp->cn_flags & HASBUF) == 0) 1061 panic("ext2fs_mkdir: no name"); 1062 #endif 1063 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1064 error = EMLINK; 1065 goto out; 1066 } 1067 dmode = vap->va_mode & ACCESSPERMS; 1068 dmode |= IFDIR; 1069 /* 1070 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1071 * but not have it entered in the parent directory. The entry is 1072 * made later after writing "." and ".." entries. 1073 */ 1074 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1075 goto out; 1076 ip = VTOI(tvp); 1077 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1078 ip->i_e2fs_gid = dp->i_e2fs_gid; 1079 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1080 ip->i_e2fs_mode = dmode; 1081 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1082 ip->i_e2fs_nlink = 2; 1083 1084 /* 1085 * Bump link count in parent directory 1086 * to reflect work done below. Should 1087 * be done before reference is created 1088 * so reparation is possible if we crash. 1089 */ 1090 dp->i_e2fs_nlink++; 1091 dp->i_flag |= IN_CHANGE; 1092 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1093 goto bad; 1094 1095 /* Initialize directory with "." and ".." from static template. */ 1096 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1097 dirtemplate.dot_ino = h2fs32(ip->i_number); 1098 dirtemplate.dot_reclen = h2fs16(12); 1099 dirtemplate.dot_namlen = 1; 1100 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1101 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1102 dirtemplate.dot_type = EXT2_FT_DIR; 1103 } 1104 dirtemplate.dot_name[0] = '.'; 1105 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1106 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1107 dirtemplate.dotdot_namlen = 2; 1108 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1109 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1110 dirtemplate.dotdot_type = EXT2_FT_DIR; 1111 } 1112 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1113 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1114 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1115 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1116 if (error) { 1117 dp->i_e2fs_nlink--; 1118 dp->i_flag |= IN_CHANGE; 1119 goto bad; 1120 } 1121 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1122 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1123 else { 1124 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1125 if (error) { 1126 dp->i_e2fs_nlink--; 1127 dp->i_flag |= IN_CHANGE; 1128 goto bad; 1129 } 1130 ip->i_flag |= IN_CHANGE; 1131 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1132 } 1133 1134 /* Directory set up, now install it's entry in the parent directory. */ 1135 error = ext2fs_direnter(ip, dvp, cnp); 1136 if (error != 0) { 1137 dp->i_e2fs_nlink--; 1138 dp->i_flag |= IN_CHANGE; 1139 } 1140 bad: 1141 /* 1142 * No need to do an explicit ext2fs_truncate here, vrele will do this 1143 * for us because we set the link count to 0. 1144 */ 1145 if (error) { 1146 ip->i_e2fs_nlink = 0; 1147 ip->i_flag |= IN_CHANGE; 1148 vput(tvp); 1149 } else { 1150 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1151 *ap->a_vpp = tvp; 1152 } 1153 out: 1154 PNBUF_PUT(cnp->cn_pnbuf); 1155 vput(dvp); 1156 return (error); 1157 } 1158 1159 /* 1160 * Rmdir system call. 1161 */ 1162 int 1163 ext2fs_rmdir(void *v) 1164 { 1165 struct vop_rmdir_args /* { 1166 struct vnode *a_dvp; 1167 struct vnode *a_vp; 1168 struct componentname *a_cnp; 1169 } */ *ap = v; 1170 struct vnode *vp = ap->a_vp; 1171 struct vnode *dvp = ap->a_dvp; 1172 struct componentname *cnp = ap->a_cnp; 1173 struct inode *ip, *dp; 1174 int error; 1175 1176 ip = VTOI(vp); 1177 dp = VTOI(dvp); 1178 /* 1179 * No rmdir "." please. 1180 */ 1181 if (dp == ip) { 1182 vrele(dvp); 1183 vput(vp); 1184 return (EINVAL); 1185 } 1186 /* 1187 * Verify the directory is empty (and valid). 1188 * (Rmdir ".." won't be valid since 1189 * ".." will contain a reference to 1190 * the current directory and thus be 1191 * non-empty.) 1192 */ 1193 error = 0; 1194 if (ip->i_e2fs_nlink != 2 || 1195 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1196 error = ENOTEMPTY; 1197 goto out; 1198 } 1199 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1200 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1201 error = EPERM; 1202 goto out; 1203 } 1204 /* 1205 * Delete reference to directory before purging 1206 * inode. If we crash in between, the directory 1207 * will be reattached to lost+found, 1208 */ 1209 error = ext2fs_dirremove(dvp, cnp); 1210 if (error != 0) 1211 goto out; 1212 dp->i_e2fs_nlink--; 1213 dp->i_flag |= IN_CHANGE; 1214 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1215 cache_purge(dvp); 1216 vput(dvp); 1217 dvp = NULL; 1218 /* 1219 * Truncate inode. The only stuff left 1220 * in the directory is "." and "..". The 1221 * "." reference is inconsequential since 1222 * we're quashing it. The ".." reference 1223 * has already been adjusted above. We've 1224 * removed the "." reference and the reference 1225 * in the parent directory, but there may be 1226 * other hard links so decrement by 2 and 1227 * worry about them later. 1228 */ 1229 ip->i_e2fs_nlink -= 2; 1230 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1231 cnp->cn_lwp->l_proc); 1232 cache_purge(ITOV(ip)); 1233 out: 1234 VN_KNOTE(vp, NOTE_DELETE); 1235 if (dvp) 1236 vput(dvp); 1237 vput(vp); 1238 return (error); 1239 } 1240 1241 /* 1242 * symlink -- make a symbolic link 1243 */ 1244 int 1245 ext2fs_symlink(void *v) 1246 { 1247 struct vop_symlink_args /* { 1248 struct vnode *a_dvp; 1249 struct vnode **a_vpp; 1250 struct componentname *a_cnp; 1251 struct vattr *a_vap; 1252 char *a_target; 1253 } */ *ap = v; 1254 struct vnode *vp, **vpp; 1255 struct inode *ip; 1256 int len, error; 1257 1258 vpp = ap->a_vpp; 1259 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1260 vpp, ap->a_cnp); 1261 if (error) 1262 return (error); 1263 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1264 vp = *vpp; 1265 len = strlen(ap->a_target); 1266 ip = VTOI(vp); 1267 if (len < ip->i_ump->um_maxsymlinklen) { 1268 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1269 error = ext2fs_setsize(ip, len); 1270 if (error) 1271 goto bad; 1272 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1273 uvm_vnp_setsize(vp, len); 1274 } else 1275 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1276 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1277 (size_t *)0, NULL); 1278 bad: 1279 if (error) 1280 vput(vp); 1281 return (error); 1282 } 1283 1284 /* 1285 * Return target name of a symbolic link 1286 */ 1287 int 1288 ext2fs_readlink(void *v) 1289 { 1290 struct vop_readlink_args /* { 1291 struct vnode *a_vp; 1292 struct uio *a_uio; 1293 kauth_cred_t a_cred; 1294 } */ *ap = v; 1295 struct vnode *vp = ap->a_vp; 1296 struct inode *ip = VTOI(vp); 1297 struct ufsmount *ump = ip->i_ump; 1298 int isize; 1299 1300 isize = ext2fs_size(ip); 1301 if (isize < ump->um_maxsymlinklen || 1302 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1303 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1304 return (0); 1305 } 1306 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1307 } 1308 1309 /* 1310 * Advisory record locking support 1311 */ 1312 int 1313 ext2fs_advlock(void *v) 1314 { 1315 struct vop_advlock_args /* { 1316 struct vnode *a_vp; 1317 caddr_t a_id; 1318 int a_op; 1319 struct flock *a_fl; 1320 int a_flags; 1321 } */ *ap = v; 1322 struct inode *ip = VTOI(ap->a_vp); 1323 1324 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1325 } 1326 1327 int 1328 ext2fs_fsync(void *v) 1329 { 1330 struct vop_fsync_args /* { 1331 struct vnode *a_vp; 1332 kauth_cred_t a_cred; 1333 int a_flags; 1334 off_t offlo; 1335 off_t offhi; 1336 struct proc *a_p; 1337 } */ *ap = v; 1338 struct vnode *vp = ap->a_vp; 1339 int wait; 1340 int error; 1341 1342 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1343 vflushbuf(vp, wait); 1344 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1345 error = 0; 1346 else 1347 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1348 1349 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1350 int l = 0; 1351 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1352 ap->a_l->l_cred, ap->a_l); 1353 } 1354 1355 return error; 1356 } 1357 1358 /* 1359 * Initialize the vnode associated with a new inode, handle aliased 1360 * vnodes. 1361 */ 1362 int 1363 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1364 int (**fifoops)(void *), struct vnode **vpp) 1365 { 1366 struct timeval tv; 1367 struct inode *ip; 1368 struct vnode *vp, *nvp; 1369 1370 vp = *vpp; 1371 ip = VTOI(vp); 1372 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1373 case VCHR: 1374 case VBLK: 1375 vp->v_op = specops; 1376 if ((nvp = checkalias(vp, 1377 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1378 /* 1379 * Discard unneeded vnode, but save its inode. 1380 */ 1381 nvp->v_data = vp->v_data; 1382 vp->v_data = NULL; 1383 VOP_UNLOCK(vp, 0); 1384 vp->v_op = spec_vnodeop_p; 1385 vp->v_flag &= ~VLOCKSWORK; 1386 vrele(vp); 1387 vgone(vp); 1388 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1389 /* 1390 * Reinitialize aliased inode. 1391 */ 1392 vp = nvp; 1393 ip->i_vnode = vp; 1394 } 1395 break; 1396 case VFIFO: 1397 vp->v_op = fifoops; 1398 break; 1399 case VNON: 1400 case VBAD: 1401 case VSOCK: 1402 case VLNK: 1403 case VDIR: 1404 case VREG: 1405 break; 1406 } 1407 if (ip->i_number == ROOTINO) 1408 vp->v_flag |= VROOT; 1409 /* 1410 * Initialize modrev times 1411 */ 1412 getmicrouptime(&tv); 1413 SETHIGH(ip->i_modrev, tv.tv_sec); 1414 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1415 *vpp = vp; 1416 return (0); 1417 } 1418 1419 /* 1420 * Allocate a new inode. 1421 */ 1422 int 1423 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1424 struct componentname *cnp) 1425 { 1426 struct inode *ip, *pdir; 1427 struct vnode *tvp; 1428 int error, ismember = 0; 1429 1430 pdir = VTOI(dvp); 1431 #ifdef DIAGNOSTIC 1432 if ((cnp->cn_flags & HASBUF) == 0) 1433 panic("ext2fs_makeinode: no name"); 1434 #endif 1435 *vpp = NULL; 1436 if ((mode & IFMT) == 0) 1437 mode |= IFREG; 1438 1439 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1440 PNBUF_PUT(cnp->cn_pnbuf); 1441 vput(dvp); 1442 return (error); 1443 } 1444 ip = VTOI(tvp); 1445 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1446 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1447 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1448 ip->i_e2fs_mode = mode; 1449 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1450 ip->i_e2fs_nlink = 1; 1451 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1452 ip->i_e2fs_gid, &ismember) != 0 || !ismember) && 1453 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1454 ip->i_e2fs_mode &= ~ISGID; 1455 1456 /* 1457 * Make sure inode goes to disk before directory entry. 1458 */ 1459 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1460 goto bad; 1461 error = ext2fs_direnter(ip, dvp, cnp); 1462 if (error != 0) 1463 goto bad; 1464 if ((cnp->cn_flags & SAVESTART) == 0) 1465 PNBUF_PUT(cnp->cn_pnbuf); 1466 vput(dvp); 1467 *vpp = tvp; 1468 return (0); 1469 1470 bad: 1471 /* 1472 * Write error occurred trying to update the inode 1473 * or the directory so must deallocate the inode. 1474 */ 1475 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1476 ip->i_e2fs_nlink = 0; 1477 ip->i_flag |= IN_CHANGE; 1478 vput(tvp); 1479 PNBUF_PUT(cnp->cn_pnbuf); 1480 vput(dvp); 1481 return (error); 1482 } 1483 1484 /* 1485 * Reclaim an inode so that it can be used for other purposes. 1486 */ 1487 int 1488 ext2fs_reclaim(void *v) 1489 { 1490 struct vop_reclaim_args /* { 1491 struct vnode *a_vp; 1492 } */ *ap = v; 1493 struct vnode *vp = ap->a_vp; 1494 struct inode *ip = VTOI(vp); 1495 int error; 1496 1497 if ((error = ufs_reclaim(vp, ap->a_l)) != 0) 1498 return (error); 1499 if (ip->i_din.e2fs_din != NULL) 1500 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1501 genfs_node_destroy(vp); 1502 pool_put(&ext2fs_inode_pool, vp->v_data); 1503 vp->v_data = NULL; 1504 return (0); 1505 } 1506 1507 /* Global vfs data structures for ext2fs. */ 1508 int (**ext2fs_vnodeop_p)(void *); 1509 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1510 { &vop_default_desc, vn_default_error }, 1511 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1512 { &vop_create_desc, ext2fs_create }, /* create */ 1513 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1514 { &vop_open_desc, ext2fs_open }, /* open */ 1515 { &vop_close_desc, ufs_close }, /* close */ 1516 { &vop_access_desc, ext2fs_access }, /* access */ 1517 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1518 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1519 { &vop_read_desc, ext2fs_read }, /* read */ 1520 { &vop_write_desc, ext2fs_write }, /* write */ 1521 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1522 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1523 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1524 { &vop_poll_desc, ufs_poll }, /* poll */ 1525 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1526 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1527 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1528 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1529 { &vop_seek_desc, ufs_seek }, /* seek */ 1530 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1531 { &vop_link_desc, ext2fs_link }, /* link */ 1532 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1533 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1534 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1535 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1536 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1537 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1538 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1539 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1540 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1541 { &vop_lock_desc, ufs_lock }, /* lock */ 1542 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1543 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1544 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1545 { &vop_print_desc, ufs_print }, /* print */ 1546 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1547 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1548 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1549 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1550 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1551 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1552 { NULL, NULL } 1553 }; 1554 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1555 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1556 1557 int (**ext2fs_specop_p)(void *); 1558 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1559 { &vop_default_desc, vn_default_error }, 1560 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1561 { &vop_create_desc, spec_create }, /* create */ 1562 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1563 { &vop_open_desc, spec_open }, /* open */ 1564 { &vop_close_desc, ufsspec_close }, /* close */ 1565 { &vop_access_desc, ext2fs_access }, /* access */ 1566 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1567 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1568 { &vop_read_desc, ufsspec_read }, /* read */ 1569 { &vop_write_desc, ufsspec_write }, /* write */ 1570 { &vop_lease_desc, spec_lease_check }, /* lease */ 1571 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1572 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1573 { &vop_poll_desc, spec_poll }, /* poll */ 1574 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1575 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1576 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1577 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1578 { &vop_seek_desc, spec_seek }, /* seek */ 1579 { &vop_remove_desc, spec_remove }, /* remove */ 1580 { &vop_link_desc, spec_link }, /* link */ 1581 { &vop_rename_desc, spec_rename }, /* rename */ 1582 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1583 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1584 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1585 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1586 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1587 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1588 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1589 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1590 { &vop_lock_desc, ufs_lock }, /* lock */ 1591 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1592 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1593 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1594 { &vop_print_desc, ufs_print }, /* print */ 1595 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1596 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1597 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1598 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1599 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1600 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1601 { NULL, NULL } 1602 }; 1603 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1604 { &ext2fs_specop_p, ext2fs_specop_entries }; 1605 1606 int (**ext2fs_fifoop_p)(void *); 1607 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1608 { &vop_default_desc, vn_default_error }, 1609 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1610 { &vop_create_desc, fifo_create }, /* create */ 1611 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1612 { &vop_open_desc, fifo_open }, /* open */ 1613 { &vop_close_desc, ufsfifo_close }, /* close */ 1614 { &vop_access_desc, ext2fs_access }, /* access */ 1615 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1616 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1617 { &vop_read_desc, ufsfifo_read }, /* read */ 1618 { &vop_write_desc, ufsfifo_write }, /* write */ 1619 { &vop_lease_desc, fifo_lease_check }, /* lease */ 1620 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1621 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1622 { &vop_poll_desc, fifo_poll }, /* poll */ 1623 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1624 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1625 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1626 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1627 { &vop_seek_desc, fifo_seek }, /* seek */ 1628 { &vop_remove_desc, fifo_remove }, /* remove */ 1629 { &vop_link_desc, fifo_link }, /* link */ 1630 { &vop_rename_desc, fifo_rename }, /* rename */ 1631 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1632 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1633 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1634 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1635 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1636 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1637 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1638 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1639 { &vop_lock_desc, ufs_lock }, /* lock */ 1640 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1641 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1642 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1643 { &vop_print_desc, ufs_print }, /* print */ 1644 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1645 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1646 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1647 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1648 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1649 { NULL, NULL } 1650 }; 1651 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1652 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1653
Indexes created Fri Sep 26 20:09:58 GMT 2025