ext2fs_vnops.c revision 1.70
1 /* $NetBSD: ext2fs_vnops.c,v 1.70 2006/12/09 16:11:52 chs 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 1.70 2006/12/09 16:11:52 chs 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 &l->l_acflag))) 354 return (error); 355 #ifdef EXT2FS_SYSTEM_FLAGS 356 if (kauth_cred_geteuid(cred) == 0) { 357 if ((ip->i_e2fs_flags & 358 (EXT2_APPEND | EXT2_IMMUTABLE)) && securelevel > 0) 359 return (EPERM); 360 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 361 ip->i_e2fs_flags |= 362 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 363 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 364 } else 365 return (EPERM); 366 #else 367 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 368 ip->i_e2fs_flags |= 369 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 370 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 371 #endif 372 ip->i_flag |= IN_CHANGE; 373 if (vap->va_flags & (IMMUTABLE | APPEND)) 374 return (0); 375 } 376 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 377 return (EPERM); 378 /* 379 * Go through the fields and update iff not VNOVAL. 380 */ 381 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 382 if (vp->v_mount->mnt_flag & MNT_RDONLY) 383 return (EROFS); 384 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 385 if (error) 386 return (error); 387 } 388 if (vap->va_size != VNOVAL) { 389 /* 390 * Disallow write attempts on read-only file systems; 391 * unless the file is a socket, fifo, or a block or 392 * character device resident on the file system. 393 */ 394 switch (vp->v_type) { 395 case VDIR: 396 return (EISDIR); 397 case VLNK: 398 case VREG: 399 if (vp->v_mount->mnt_flag & MNT_RDONLY) 400 return (EROFS); 401 default: 402 break; 403 } 404 error = ext2fs_truncate(vp, vap->va_size, 0, cred, l->l_proc); 405 if (error) 406 return (error); 407 } 408 ip = VTOI(vp); 409 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 410 if (vp->v_mount->mnt_flag & MNT_RDONLY) 411 return (EROFS); 412 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 413 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 414 &l->l_acflag)) && 415 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 416 (error = VOP_ACCESS(vp, VWRITE, cred, l)))) 417 return (error); 418 if (vap->va_atime.tv_sec != VNOVAL) 419 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 420 ip->i_flag |= IN_ACCESS; 421 if (vap->va_mtime.tv_sec != VNOVAL) 422 ip->i_flag |= IN_CHANGE | IN_UPDATE; 423 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 424 UPDATE_WAIT); 425 if (error) 426 return (error); 427 } 428 error = 0; 429 if (vap->va_mode != (mode_t)VNOVAL) { 430 if (vp->v_mount->mnt_flag & MNT_RDONLY) 431 return (EROFS); 432 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l); 433 } 434 VN_KNOTE(vp, NOTE_ATTRIB); 435 return (error); 436 } 437 438 /* 439 * Change the mode on a file. 440 * Inode must be locked before calling. 441 */ 442 static int 443 ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l) 444 { 445 struct inode *ip = VTOI(vp); 446 int error, ismember = 0; 447 448 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 449 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 450 &l->l_acflag))) 451 return (error); 452 if (kauth_cred_geteuid(cred)) { 453 if (vp->v_type != VDIR && (mode & S_ISTXT)) 454 return (EFTYPE); 455 if ((kauth_cred_ismember_gid(cred, ip->i_e2fs_gid, &ismember) != 0 || 456 !ismember) && (mode & ISGID)) 457 return (EPERM); 458 } 459 ip->i_e2fs_mode &= ~ALLPERMS; 460 ip->i_e2fs_mode |= (mode & ALLPERMS); 461 ip->i_flag |= IN_CHANGE; 462 return (0); 463 } 464 465 /* 466 * Perform chown operation on inode ip; 467 * inode must be locked prior to call. 468 */ 469 static int 470 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 471 struct lwp *l) 472 { 473 struct inode *ip = VTOI(vp); 474 uid_t ouid; 475 gid_t ogid; 476 int error = 0, ismember = 0; 477 478 if (uid == (uid_t)VNOVAL) 479 uid = ip->i_e2fs_uid; 480 if (gid == (gid_t)VNOVAL) 481 gid = ip->i_e2fs_gid; 482 /* 483 * If we don't own the file, are trying to change the owner 484 * of the file, or are not a member of the target group, 485 * the caller must be superuser or the call fails. 486 */ 487 if ((kauth_cred_geteuid(cred) != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 488 (gid != ip->i_e2fs_gid && 489 !(kauth_cred_getegid(cred) == gid || 490 (kauth_cred_ismember_gid(cred, gid, &ismember) == 0 && ismember)))) && 491 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 492 &l->l_acflag))) 493 return (error); 494 ogid = ip->i_e2fs_gid; 495 ouid = ip->i_e2fs_uid; 496 497 ip->i_e2fs_gid = gid; 498 ip->i_e2fs_uid = uid; 499 if (ouid != uid || ogid != gid) 500 ip->i_flag |= IN_CHANGE; 501 if (ouid != uid && kauth_cred_geteuid(cred) != 0) 502 ip->i_e2fs_mode &= ~ISUID; 503 if (ogid != gid && kauth_cred_geteuid(cred) != 0) 504 ip->i_e2fs_mode &= ~ISGID; 505 return (0); 506 } 507 508 int 509 ext2fs_remove(void *v) 510 { 511 struct vop_remove_args /* { 512 struct vnode *a_dvp; 513 struct vnode *a_vp; 514 struct componentname *a_cnp; 515 } */ *ap = v; 516 struct inode *ip; 517 struct vnode *vp = ap->a_vp; 518 struct vnode *dvp = ap->a_dvp; 519 int error; 520 521 ip = VTOI(vp); 522 if (vp->v_type == VDIR || 523 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 524 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 525 error = EPERM; 526 } else { 527 error = ext2fs_dirremove(dvp, ap->a_cnp); 528 if (error == 0) { 529 ip->i_e2fs_nlink--; 530 ip->i_flag |= IN_CHANGE; 531 } 532 } 533 534 VN_KNOTE(vp, NOTE_DELETE); 535 VN_KNOTE(dvp, NOTE_WRITE); 536 if (dvp == vp) 537 vrele(vp); 538 else 539 vput(vp); 540 vput(dvp); 541 return (error); 542 } 543 544 /* 545 * link vnode call 546 */ 547 int 548 ext2fs_link(void *v) 549 { 550 struct vop_link_args /* { 551 struct vnode *a_dvp; 552 struct vnode *a_vp; 553 struct componentname *a_cnp; 554 } */ *ap = v; 555 struct vnode *dvp = ap->a_dvp; 556 struct vnode *vp = ap->a_vp; 557 struct componentname *cnp = ap->a_cnp; 558 struct inode *ip; 559 int error; 560 561 #ifdef DIAGNOSTIC 562 if ((cnp->cn_flags & HASBUF) == 0) 563 panic("ext2fs_link: no name"); 564 #endif 565 if (vp->v_type == VDIR) { 566 VOP_ABORTOP(dvp, cnp); 567 error = EISDIR; 568 goto out2; 569 } 570 if (dvp->v_mount != vp->v_mount) { 571 VOP_ABORTOP(dvp, cnp); 572 error = EXDEV; 573 goto out2; 574 } 575 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 576 VOP_ABORTOP(dvp, cnp); 577 goto out2; 578 } 579 ip = VTOI(vp); 580 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 581 VOP_ABORTOP(dvp, cnp); 582 error = EMLINK; 583 goto out1; 584 } 585 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 586 VOP_ABORTOP(dvp, cnp); 587 error = EPERM; 588 goto out1; 589 } 590 ip->i_e2fs_nlink++; 591 ip->i_flag |= IN_CHANGE; 592 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 593 if (!error) 594 error = ext2fs_direnter(ip, dvp, cnp); 595 if (error) { 596 ip->i_e2fs_nlink--; 597 ip->i_flag |= IN_CHANGE; 598 } 599 PNBUF_PUT(cnp->cn_pnbuf); 600 out1: 601 if (dvp != vp) 602 VOP_UNLOCK(vp, 0); 603 out2: 604 VN_KNOTE(vp, NOTE_LINK); 605 VN_KNOTE(dvp, NOTE_WRITE); 606 vput(dvp); 607 return (error); 608 } 609 610 /* 611 * Rename system call. 612 * rename("foo", "bar"); 613 * is essentially 614 * unlink("bar"); 615 * link("foo", "bar"); 616 * unlink("foo"); 617 * but ``atomically''. Can't do full commit without saving state in the 618 * inode on disk which isn't feasible at this time. Best we can do is 619 * always guarantee the target exists. 620 * 621 * Basic algorithm is: 622 * 623 * 1) Bump link count on source while we're linking it to the 624 * target. This also ensure the inode won't be deleted out 625 * from underneath us while we work (it may be truncated by 626 * a concurrent `trunc' or `open' for creation). 627 * 2) Link source to destination. If destination already exists, 628 * delete it first. 629 * 3) Unlink source reference to inode if still around. If a 630 * directory was moved and the parent of the destination 631 * is different from the source, patch the ".." entry in the 632 * directory. 633 */ 634 int 635 ext2fs_rename(void *v) 636 { 637 struct vop_rename_args /* { 638 struct vnode *a_fdvp; 639 struct vnode *a_fvp; 640 struct componentname *a_fcnp; 641 struct vnode *a_tdvp; 642 struct vnode *a_tvp; 643 struct componentname *a_tcnp; 644 } */ *ap = v; 645 struct vnode *tvp = ap->a_tvp; 646 struct vnode *tdvp = ap->a_tdvp; 647 struct vnode *fvp = ap->a_fvp; 648 struct vnode *fdvp = ap->a_fdvp; 649 struct componentname *tcnp = ap->a_tcnp; 650 struct componentname *fcnp = ap->a_fcnp; 651 struct inode *ip, *xp, *dp; 652 struct ext2fs_dirtemplate dirbuf; 653 int doingdirectory = 0, oldparent = 0, newparent = 0; 654 int error = 0; 655 u_char namlen; 656 657 #ifdef DIAGNOSTIC 658 if ((tcnp->cn_flags & HASBUF) == 0 || 659 (fcnp->cn_flags & HASBUF) == 0) 660 panic("ext2fs_rename: no name"); 661 #endif 662 /* 663 * Check for cross-device rename. 664 */ 665 if ((fvp->v_mount != tdvp->v_mount) || 666 (tvp && (fvp->v_mount != tvp->v_mount))) { 667 error = EXDEV; 668 abortit: 669 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 670 if (tdvp == tvp) 671 vrele(tdvp); 672 else 673 vput(tdvp); 674 if (tvp) 675 vput(tvp); 676 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 677 vrele(fdvp); 678 vrele(fvp); 679 return (error); 680 } 681 682 /* 683 * Check if just deleting a link name. 684 */ 685 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 686 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 687 error = EPERM; 688 goto abortit; 689 } 690 if (fvp == tvp) { 691 if (fvp->v_type == VDIR) { 692 error = EINVAL; 693 goto abortit; 694 } 695 696 /* Release destination completely. */ 697 VOP_ABORTOP(tdvp, tcnp); 698 vput(tdvp); 699 vput(tvp); 700 701 /* Delete source. */ 702 vrele(fvp); 703 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 704 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 705 fcnp->cn_nameiop = DELETE; 706 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 707 if ((error = relookup(fdvp, &fvp, fcnp))) { 708 vput(fdvp); 709 return (error); 710 } 711 return (VOP_REMOVE(fdvp, fvp, fcnp)); 712 } 713 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 714 goto abortit; 715 dp = VTOI(fdvp); 716 ip = VTOI(fvp); 717 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 718 VOP_UNLOCK(fvp, 0); 719 error = EMLINK; 720 goto abortit; 721 } 722 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 723 (dp->i_e2fs_flags & EXT2_APPEND)) { 724 VOP_UNLOCK(fvp, 0); 725 error = EPERM; 726 goto abortit; 727 } 728 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 729 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 730 if (!error && tvp) 731 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, 732 tcnp->cn_lwp); 733 if (error) { 734 VOP_UNLOCK(fvp, 0); 735 error = EACCES; 736 goto abortit; 737 } 738 /* 739 * Avoid ".", "..", and aliases of "." for obvious reasons. 740 */ 741 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 742 dp == ip || 743 (fcnp->cn_flags & ISDOTDOT) || 744 (tcnp->cn_flags & ISDOTDOT) || 745 (ip->i_flag & IN_RENAME)) { 746 VOP_UNLOCK(fvp, 0); 747 error = EINVAL; 748 goto abortit; 749 } 750 ip->i_flag |= IN_RENAME; 751 oldparent = dp->i_number; 752 doingdirectory = 1; 753 } 754 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 755 756 /* 757 * When the target exists, both the directory 758 * and target vnodes are returned locked. 759 */ 760 dp = VTOI(tdvp); 761 xp = NULL; 762 if (tvp) 763 xp = VTOI(tvp); 764 765 /* 766 * 1) Bump link count while we're moving stuff 767 * around. If we crash somewhere before 768 * completing our work, the link count 769 * may be wrong, but correctable. 770 */ 771 ip->i_e2fs_nlink++; 772 ip->i_flag |= IN_CHANGE; 773 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 774 VOP_UNLOCK(fvp, 0); 775 goto bad; 776 } 777 778 /* 779 * If ".." must be changed (ie the directory gets a new 780 * parent) then the source directory must not be in the 781 * directory hierarchy above the target, as this would 782 * orphan everything below the source directory. Also 783 * the user must have write permission in the source so 784 * as to be able to change "..". We must repeat the call 785 * to namei, as the parent directory is unlocked by the 786 * call to checkpath(). 787 */ 788 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 789 VOP_UNLOCK(fvp, 0); 790 if (oldparent != dp->i_number) 791 newparent = dp->i_number; 792 if (doingdirectory && newparent) { 793 if (error) /* write access check above */ 794 goto bad; 795 if (xp != NULL) 796 vput(tvp); 797 vref(tdvp); /* compensate for the ref checkpath loses */ 798 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 799 if (error != 0) { 800 vrele(tdvp); 801 goto out; 802 } 803 tcnp->cn_flags &= ~SAVESTART; 804 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 805 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) { 806 vput(tdvp); 807 goto out; 808 } 809 dp = VTOI(tdvp); 810 xp = NULL; 811 if (tvp) 812 xp = VTOI(tvp); 813 } 814 /* 815 * 2) If target doesn't exist, link the target 816 * to the source and unlink the source. 817 * Otherwise, rewrite the target directory 818 * entry to reference the source inode and 819 * expunge the original entry's existence. 820 */ 821 if (xp == NULL) { 822 if (dp->i_dev != ip->i_dev) 823 panic("rename: EXDEV"); 824 /* 825 * Account for ".." in new directory. 826 * When source and destination have the same 827 * parent we don't fool with the link count. 828 */ 829 if (doingdirectory && newparent) { 830 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 831 error = EMLINK; 832 goto bad; 833 } 834 dp->i_e2fs_nlink++; 835 dp->i_flag |= IN_CHANGE; 836 if ((error = ext2fs_update(tdvp, NULL, NULL, 837 UPDATE_WAIT)) != 0) 838 goto bad; 839 } 840 error = ext2fs_direnter(ip, tdvp, tcnp); 841 if (error != 0) { 842 if (doingdirectory && newparent) { 843 dp->i_e2fs_nlink--; 844 dp->i_flag |= IN_CHANGE; 845 (void)ext2fs_update(tdvp, NULL, NULL, 846 UPDATE_WAIT); 847 } 848 goto bad; 849 } 850 VN_KNOTE(tdvp, NOTE_WRITE); 851 vput(tdvp); 852 } else { 853 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 854 panic("rename: EXDEV"); 855 /* 856 * Short circuit rename(foo, foo). 857 */ 858 if (xp->i_number == ip->i_number) 859 panic("rename: same file"); 860 /* 861 * If the parent directory is "sticky", then the user must 862 * own the parent directory, or the destination of the rename, 863 * otherwise the destination may not be changed (except by 864 * root). This implements append-only directories. 865 */ 866 if ((dp->i_e2fs_mode & S_ISTXT) && kauth_cred_geteuid(tcnp->cn_cred) != 0 && 867 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_e2fs_uid && 868 xp->i_e2fs_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 869 error = EPERM; 870 goto bad; 871 } 872 /* 873 * Target must be empty if a directory and have no links 874 * to it. Also, ensure source and target are compatible 875 * (both directories, or both not directories). 876 */ 877 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 878 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 879 xp->i_e2fs_nlink > 2) { 880 error = ENOTEMPTY; 881 goto bad; 882 } 883 if (!doingdirectory) { 884 error = ENOTDIR; 885 goto bad; 886 } 887 cache_purge(tdvp); 888 } else if (doingdirectory) { 889 error = EISDIR; 890 goto bad; 891 } 892 error = ext2fs_dirrewrite(dp, ip, tcnp); 893 if (error != 0) 894 goto bad; 895 /* 896 * If the target directory is in the same 897 * directory as the source directory, 898 * decrement the link count on the parent 899 * of the target directory. 900 */ 901 if (doingdirectory && !newparent) { 902 dp->i_e2fs_nlink--; 903 dp->i_flag |= IN_CHANGE; 904 } 905 /* 906 * Adjust the link count of the target to 907 * reflect the dirrewrite above. If this is 908 * a directory it is empty and there are 909 * no links to it, so we can squash the inode and 910 * any space associated with it. We disallowed 911 * renaming over top of a directory with links to 912 * it above, as the remaining link would point to 913 * a directory without "." or ".." entries. 914 */ 915 xp->i_e2fs_nlink--; 916 if (doingdirectory) { 917 if (--xp->i_e2fs_nlink != 0) 918 panic("rename: linked directory"); 919 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 920 tcnp->cn_cred, tcnp->cn_lwp->l_proc); 921 } 922 xp->i_flag |= IN_CHANGE; 923 VN_KNOTE(tdvp, NOTE_WRITE); 924 vput(tdvp); 925 VN_KNOTE(tvp, NOTE_DELETE); 926 vput(tvp); 927 xp = NULL; 928 } 929 930 /* 931 * 3) Unlink the source. 932 */ 933 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 934 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 935 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 936 if ((error = relookup(fdvp, &fvp, fcnp))) { 937 vput(fdvp); 938 vrele(ap->a_fvp); 939 return (error); 940 } 941 if (fvp != NULL) { 942 xp = VTOI(fvp); 943 dp = VTOI(fdvp); 944 } else { 945 /* 946 * From name has disappeared. 947 */ 948 if (doingdirectory) 949 panic("ext2fs_rename: lost dir entry"); 950 vrele(ap->a_fvp); 951 return (0); 952 } 953 /* 954 * Ensure that the directory entry still exists and has not 955 * changed while the new name has been entered. If the source is 956 * a file then the entry may have been unlinked or renamed. In 957 * either case there is no further work to be done. If the source 958 * is a directory then it cannot have been rmdir'ed; its link 959 * count of three would cause a rmdir to fail with ENOTEMPTY. 960 * The IRENAME flag ensures that it cannot be moved by another 961 * rename. 962 */ 963 if (xp != ip) { 964 if (doingdirectory) 965 panic("ext2fs_rename: lost dir entry"); 966 } else { 967 /* 968 * If the source is a directory with a 969 * new parent, the link count of the old 970 * parent directory must be decremented 971 * and ".." set to point to the new parent. 972 */ 973 if (doingdirectory && newparent) { 974 KASSERT(dp != NULL); 975 dp->i_e2fs_nlink--; 976 dp->i_flag |= IN_CHANGE; 977 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 978 sizeof (struct ext2fs_dirtemplate), (off_t)0, 979 UIO_SYSSPACE, IO_NODELOCKED, 980 tcnp->cn_cred, (size_t *)0, NULL); 981 if (error == 0) { 982 namlen = dirbuf.dotdot_namlen; 983 if (namlen != 2 || 984 dirbuf.dotdot_name[0] != '.' || 985 dirbuf.dotdot_name[1] != '.') { 986 ufs_dirbad(xp, (doff_t)12, 987 "ext2fs_rename: mangled dir"); 988 } else { 989 dirbuf.dotdot_ino = h2fs32(newparent); 990 (void) vn_rdwr(UIO_WRITE, fvp, 991 (caddr_t)&dirbuf, 992 sizeof (struct dirtemplate), 993 (off_t)0, UIO_SYSSPACE, 994 IO_NODELOCKED|IO_SYNC, 995 tcnp->cn_cred, (size_t *)0, 996 NULL); 997 cache_purge(fdvp); 998 } 999 } 1000 } 1001 error = ext2fs_dirremove(fdvp, fcnp); 1002 if (!error) { 1003 xp->i_e2fs_nlink--; 1004 xp->i_flag |= IN_CHANGE; 1005 } 1006 xp->i_flag &= ~IN_RENAME; 1007 } 1008 VN_KNOTE(fvp, NOTE_RENAME); 1009 if (dp) 1010 vput(fdvp); 1011 if (xp) 1012 vput(fvp); 1013 vrele(ap->a_fvp); 1014 return (error); 1015 1016 bad: 1017 if (xp) 1018 vput(ITOV(xp)); 1019 vput(ITOV(dp)); 1020 out: 1021 if (doingdirectory) 1022 ip->i_flag &= ~IN_RENAME; 1023 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1024 ip->i_e2fs_nlink--; 1025 ip->i_flag |= IN_CHANGE; 1026 vput(fvp); 1027 } else 1028 vrele(fvp); 1029 vrele(fdvp); 1030 return (error); 1031 } 1032 1033 /* 1034 * Mkdir system call 1035 */ 1036 int 1037 ext2fs_mkdir(void *v) 1038 { 1039 struct vop_mkdir_args /* { 1040 struct vnode *a_dvp; 1041 struct vnode **a_vpp; 1042 struct componentname *a_cnp; 1043 struct vattr *a_vap; 1044 } */ *ap = v; 1045 struct vnode *dvp = ap->a_dvp; 1046 struct vattr *vap = ap->a_vap; 1047 struct componentname *cnp = ap->a_cnp; 1048 struct inode *ip, *dp = VTOI(dvp); 1049 struct vnode *tvp; 1050 struct ext2fs_dirtemplate dirtemplate; 1051 int error, dmode; 1052 1053 #ifdef DIAGNOSTIC 1054 if ((cnp->cn_flags & HASBUF) == 0) 1055 panic("ext2fs_mkdir: no name"); 1056 #endif 1057 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1058 error = EMLINK; 1059 goto out; 1060 } 1061 dmode = vap->va_mode & ACCESSPERMS; 1062 dmode |= IFDIR; 1063 /* 1064 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1065 * but not have it entered in the parent directory. The entry is 1066 * made later after writing "." and ".." entries. 1067 */ 1068 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1069 goto out; 1070 ip = VTOI(tvp); 1071 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1072 ip->i_e2fs_gid = dp->i_e2fs_gid; 1073 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1074 ip->i_e2fs_mode = dmode; 1075 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1076 ip->i_e2fs_nlink = 2; 1077 1078 /* 1079 * Bump link count in parent directory 1080 * to reflect work done below. Should 1081 * be done before reference is created 1082 * so reparation is possible if we crash. 1083 */ 1084 dp->i_e2fs_nlink++; 1085 dp->i_flag |= IN_CHANGE; 1086 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1087 goto bad; 1088 1089 /* Initialize directory with "." and ".." from static template. */ 1090 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1091 dirtemplate.dot_ino = h2fs32(ip->i_number); 1092 dirtemplate.dot_reclen = h2fs16(12); 1093 dirtemplate.dot_namlen = 1; 1094 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1095 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1096 dirtemplate.dot_type = EXT2_FT_DIR; 1097 } 1098 dirtemplate.dot_name[0] = '.'; 1099 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1100 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1101 dirtemplate.dotdot_namlen = 2; 1102 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1103 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1104 dirtemplate.dotdot_type = EXT2_FT_DIR; 1105 } 1106 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1107 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1108 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1109 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1110 if (error) { 1111 dp->i_e2fs_nlink--; 1112 dp->i_flag |= IN_CHANGE; 1113 goto bad; 1114 } 1115 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1116 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1117 else { 1118 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1119 if (error) { 1120 dp->i_e2fs_nlink--; 1121 dp->i_flag |= IN_CHANGE; 1122 goto bad; 1123 } 1124 ip->i_flag |= IN_CHANGE; 1125 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1126 } 1127 1128 /* Directory set up, now install it's entry in the parent directory. */ 1129 error = ext2fs_direnter(ip, dvp, cnp); 1130 if (error != 0) { 1131 dp->i_e2fs_nlink--; 1132 dp->i_flag |= IN_CHANGE; 1133 } 1134 bad: 1135 /* 1136 * No need to do an explicit ext2fs_truncate here, vrele will do this 1137 * for us because we set the link count to 0. 1138 */ 1139 if (error) { 1140 ip->i_e2fs_nlink = 0; 1141 ip->i_flag |= IN_CHANGE; 1142 vput(tvp); 1143 } else { 1144 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1145 *ap->a_vpp = tvp; 1146 } 1147 out: 1148 PNBUF_PUT(cnp->cn_pnbuf); 1149 vput(dvp); 1150 return (error); 1151 } 1152 1153 /* 1154 * Rmdir system call. 1155 */ 1156 int 1157 ext2fs_rmdir(void *v) 1158 { 1159 struct vop_rmdir_args /* { 1160 struct vnode *a_dvp; 1161 struct vnode *a_vp; 1162 struct componentname *a_cnp; 1163 } */ *ap = v; 1164 struct vnode *vp = ap->a_vp; 1165 struct vnode *dvp = ap->a_dvp; 1166 struct componentname *cnp = ap->a_cnp; 1167 struct inode *ip, *dp; 1168 int error; 1169 1170 ip = VTOI(vp); 1171 dp = VTOI(dvp); 1172 /* 1173 * No rmdir "." please. 1174 */ 1175 if (dp == ip) { 1176 vrele(dvp); 1177 vput(vp); 1178 return (EINVAL); 1179 } 1180 /* 1181 * Verify the directory is empty (and valid). 1182 * (Rmdir ".." won't be valid since 1183 * ".." will contain a reference to 1184 * the current directory and thus be 1185 * non-empty.) 1186 */ 1187 error = 0; 1188 if (ip->i_e2fs_nlink != 2 || 1189 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1190 error = ENOTEMPTY; 1191 goto out; 1192 } 1193 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1194 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1195 error = EPERM; 1196 goto out; 1197 } 1198 /* 1199 * Delete reference to directory before purging 1200 * inode. If we crash in between, the directory 1201 * will be reattached to lost+found, 1202 */ 1203 error = ext2fs_dirremove(dvp, cnp); 1204 if (error != 0) 1205 goto out; 1206 dp->i_e2fs_nlink--; 1207 dp->i_flag |= IN_CHANGE; 1208 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1209 cache_purge(dvp); 1210 vput(dvp); 1211 dvp = NULL; 1212 /* 1213 * Truncate inode. The only stuff left 1214 * in the directory is "." and "..". The 1215 * "." reference is inconsequential since 1216 * we're quashing it. The ".." reference 1217 * has already been adjusted above. We've 1218 * removed the "." reference and the reference 1219 * in the parent directory, but there may be 1220 * other hard links so decrement by 2 and 1221 * worry about them later. 1222 */ 1223 ip->i_e2fs_nlink -= 2; 1224 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1225 cnp->cn_lwp->l_proc); 1226 cache_purge(ITOV(ip)); 1227 out: 1228 VN_KNOTE(vp, NOTE_DELETE); 1229 if (dvp) 1230 vput(dvp); 1231 vput(vp); 1232 return (error); 1233 } 1234 1235 /* 1236 * symlink -- make a symbolic link 1237 */ 1238 int 1239 ext2fs_symlink(void *v) 1240 { 1241 struct vop_symlink_args /* { 1242 struct vnode *a_dvp; 1243 struct vnode **a_vpp; 1244 struct componentname *a_cnp; 1245 struct vattr *a_vap; 1246 char *a_target; 1247 } */ *ap = v; 1248 struct vnode *vp, **vpp; 1249 struct inode *ip; 1250 int len, error; 1251 1252 vpp = ap->a_vpp; 1253 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1254 vpp, ap->a_cnp); 1255 if (error) 1256 return (error); 1257 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1258 vp = *vpp; 1259 len = strlen(ap->a_target); 1260 ip = VTOI(vp); 1261 if (len < ip->i_ump->um_maxsymlinklen) { 1262 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1263 error = ext2fs_setsize(ip, len); 1264 if (error) 1265 goto bad; 1266 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1267 uvm_vnp_setsize(vp, len); 1268 } else 1269 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1270 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1271 (size_t *)0, NULL); 1272 bad: 1273 if (error) 1274 vput(vp); 1275 return (error); 1276 } 1277 1278 /* 1279 * Return target name of a symbolic link 1280 */ 1281 int 1282 ext2fs_readlink(void *v) 1283 { 1284 struct vop_readlink_args /* { 1285 struct vnode *a_vp; 1286 struct uio *a_uio; 1287 kauth_cred_t a_cred; 1288 } */ *ap = v; 1289 struct vnode *vp = ap->a_vp; 1290 struct inode *ip = VTOI(vp); 1291 struct ufsmount *ump = ip->i_ump; 1292 int isize; 1293 1294 isize = ext2fs_size(ip); 1295 if (isize < ump->um_maxsymlinklen || 1296 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1297 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1298 return (0); 1299 } 1300 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1301 } 1302 1303 /* 1304 * Advisory record locking support 1305 */ 1306 int 1307 ext2fs_advlock(void *v) 1308 { 1309 struct vop_advlock_args /* { 1310 struct vnode *a_vp; 1311 caddr_t a_id; 1312 int a_op; 1313 struct flock *a_fl; 1314 int a_flags; 1315 } */ *ap = v; 1316 struct inode *ip = VTOI(ap->a_vp); 1317 1318 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1319 } 1320 1321 int 1322 ext2fs_fsync(void *v) 1323 { 1324 struct vop_fsync_args /* { 1325 struct vnode *a_vp; 1326 kauth_cred_t a_cred; 1327 int a_flags; 1328 off_t offlo; 1329 off_t offhi; 1330 struct proc *a_p; 1331 } */ *ap = v; 1332 struct vnode *vp = ap->a_vp; 1333 int wait; 1334 int error; 1335 1336 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1337 vflushbuf(vp, wait); 1338 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1339 error = 0; 1340 else 1341 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1342 1343 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1344 int l = 0; 1345 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1346 ap->a_l->l_cred, ap->a_l); 1347 } 1348 1349 return error; 1350 } 1351 1352 /* 1353 * Initialize the vnode associated with a new inode, handle aliased 1354 * vnodes. 1355 */ 1356 int 1357 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1358 int (**fifoops)(void *), struct vnode **vpp) 1359 { 1360 struct timeval tv; 1361 struct inode *ip; 1362 struct vnode *vp, *nvp; 1363 1364 vp = *vpp; 1365 ip = VTOI(vp); 1366 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1367 case VCHR: 1368 case VBLK: 1369 vp->v_op = specops; 1370 if ((nvp = checkalias(vp, 1371 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1372 /* 1373 * Discard unneeded vnode, but save its inode. 1374 */ 1375 nvp->v_data = vp->v_data; 1376 vp->v_data = NULL; 1377 VOP_UNLOCK(vp, 0); 1378 vp->v_op = spec_vnodeop_p; 1379 vp->v_flag &= ~VLOCKSWORK; 1380 vrele(vp); 1381 vgone(vp); 1382 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1383 /* 1384 * Reinitialize aliased inode. 1385 */ 1386 vp = nvp; 1387 ip->i_vnode = vp; 1388 } 1389 break; 1390 case VFIFO: 1391 vp->v_op = fifoops; 1392 break; 1393 case VNON: 1394 case VBAD: 1395 case VSOCK: 1396 case VLNK: 1397 case VDIR: 1398 case VREG: 1399 break; 1400 } 1401 if (ip->i_number == ROOTINO) 1402 vp->v_flag |= VROOT; 1403 /* 1404 * Initialize modrev times 1405 */ 1406 getmicrouptime(&tv); 1407 SETHIGH(ip->i_modrev, tv.tv_sec); 1408 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1409 *vpp = vp; 1410 return (0); 1411 } 1412 1413 /* 1414 * Allocate a new inode. 1415 */ 1416 int 1417 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1418 struct componentname *cnp) 1419 { 1420 struct inode *ip, *pdir; 1421 struct vnode *tvp; 1422 int error, ismember = 0; 1423 1424 pdir = VTOI(dvp); 1425 #ifdef DIAGNOSTIC 1426 if ((cnp->cn_flags & HASBUF) == 0) 1427 panic("ext2fs_makeinode: no name"); 1428 #endif 1429 *vpp = NULL; 1430 if ((mode & IFMT) == 0) 1431 mode |= IFREG; 1432 1433 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1434 PNBUF_PUT(cnp->cn_pnbuf); 1435 vput(dvp); 1436 return (error); 1437 } 1438 ip = VTOI(tvp); 1439 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1440 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1441 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1442 ip->i_e2fs_mode = mode; 1443 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1444 ip->i_e2fs_nlink = 1; 1445 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1446 ip->i_e2fs_gid, &ismember) != 0 || !ismember) && 1447 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1448 ip->i_e2fs_mode &= ~ISGID; 1449 1450 /* 1451 * Make sure inode goes to disk before directory entry. 1452 */ 1453 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1454 goto bad; 1455 error = ext2fs_direnter(ip, dvp, cnp); 1456 if (error != 0) 1457 goto bad; 1458 if ((cnp->cn_flags & SAVESTART) == 0) 1459 PNBUF_PUT(cnp->cn_pnbuf); 1460 vput(dvp); 1461 *vpp = tvp; 1462 return (0); 1463 1464 bad: 1465 /* 1466 * Write error occurred trying to update the inode 1467 * or the directory so must deallocate the inode. 1468 */ 1469 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1470 ip->i_e2fs_nlink = 0; 1471 ip->i_flag |= IN_CHANGE; 1472 vput(tvp); 1473 PNBUF_PUT(cnp->cn_pnbuf); 1474 vput(dvp); 1475 return (error); 1476 } 1477 1478 /* 1479 * Reclaim an inode so that it can be used for other purposes. 1480 */ 1481 int 1482 ext2fs_reclaim(void *v) 1483 { 1484 struct vop_reclaim_args /* { 1485 struct vnode *a_vp; 1486 } */ *ap = v; 1487 struct vnode *vp = ap->a_vp; 1488 struct inode *ip = VTOI(vp); 1489 int error; 1490 1491 if ((error = ufs_reclaim(vp, ap->a_l)) != 0) 1492 return (error); 1493 if (ip->i_din.e2fs_din != NULL) 1494 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1495 pool_put(&ext2fs_inode_pool, vp->v_data); 1496 vp->v_data = NULL; 1497 return (0); 1498 } 1499 1500 /* Global vfs data structures for ext2fs. */ 1501 int (**ext2fs_vnodeop_p)(void *); 1502 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1503 { &vop_default_desc, vn_default_error }, 1504 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1505 { &vop_create_desc, ext2fs_create }, /* create */ 1506 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1507 { &vop_open_desc, ext2fs_open }, /* open */ 1508 { &vop_close_desc, ufs_close }, /* close */ 1509 { &vop_access_desc, ext2fs_access }, /* access */ 1510 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1511 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1512 { &vop_read_desc, ext2fs_read }, /* read */ 1513 { &vop_write_desc, ext2fs_write }, /* write */ 1514 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1515 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1516 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1517 { &vop_poll_desc, ufs_poll }, /* poll */ 1518 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1519 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1520 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1521 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1522 { &vop_seek_desc, ufs_seek }, /* seek */ 1523 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1524 { &vop_link_desc, ext2fs_link }, /* link */ 1525 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1526 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1527 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1528 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1529 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1530 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1531 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1532 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1533 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1534 { &vop_lock_desc, ufs_lock }, /* lock */ 1535 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1536 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1537 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1538 { &vop_print_desc, ufs_print }, /* print */ 1539 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1540 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1541 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1542 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1543 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1544 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1545 { NULL, NULL } 1546 }; 1547 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1548 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1549 1550 int (**ext2fs_specop_p)(void *); 1551 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1552 { &vop_default_desc, vn_default_error }, 1553 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1554 { &vop_create_desc, spec_create }, /* create */ 1555 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1556 { &vop_open_desc, spec_open }, /* open */ 1557 { &vop_close_desc, ufsspec_close }, /* close */ 1558 { &vop_access_desc, ext2fs_access }, /* access */ 1559 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1560 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1561 { &vop_read_desc, ufsspec_read }, /* read */ 1562 { &vop_write_desc, ufsspec_write }, /* write */ 1563 { &vop_lease_desc, spec_lease_check }, /* lease */ 1564 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1565 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1566 { &vop_poll_desc, spec_poll }, /* poll */ 1567 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1568 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1569 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1570 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1571 { &vop_seek_desc, spec_seek }, /* seek */ 1572 { &vop_remove_desc, spec_remove }, /* remove */ 1573 { &vop_link_desc, spec_link }, /* link */ 1574 { &vop_rename_desc, spec_rename }, /* rename */ 1575 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1576 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1577 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1578 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1579 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1580 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1581 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1582 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1583 { &vop_lock_desc, ufs_lock }, /* lock */ 1584 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1585 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1586 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1587 { &vop_print_desc, ufs_print }, /* print */ 1588 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1589 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1590 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1591 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1592 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1593 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1594 { NULL, NULL } 1595 }; 1596 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1597 { &ext2fs_specop_p, ext2fs_specop_entries }; 1598 1599 int (**ext2fs_fifoop_p)(void *); 1600 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1601 { &vop_default_desc, vn_default_error }, 1602 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1603 { &vop_create_desc, fifo_create }, /* create */ 1604 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1605 { &vop_open_desc, fifo_open }, /* open */ 1606 { &vop_close_desc, ufsfifo_close }, /* close */ 1607 { &vop_access_desc, ext2fs_access }, /* access */ 1608 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1609 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1610 { &vop_read_desc, ufsfifo_read }, /* read */ 1611 { &vop_write_desc, ufsfifo_write }, /* write */ 1612 { &vop_lease_desc, fifo_lease_check }, /* lease */ 1613 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1614 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1615 { &vop_poll_desc, fifo_poll }, /* poll */ 1616 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1617 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1618 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1619 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1620 { &vop_seek_desc, fifo_seek }, /* seek */ 1621 { &vop_remove_desc, fifo_remove }, /* remove */ 1622 { &vop_link_desc, fifo_link }, /* link */ 1623 { &vop_rename_desc, fifo_rename }, /* rename */ 1624 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1625 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1626 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1627 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1628 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1629 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1630 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1631 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1632 { &vop_lock_desc, ufs_lock }, /* lock */ 1633 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1634 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1635 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1636 { &vop_print_desc, ufs_print }, /* print */ 1637 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1638 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1639 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1640 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1641 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1642 { NULL, NULL } 1643 }; 1644 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1645 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1646
Indexes created Sat Sep 27 22:09:54 GMT 2025