ext2fs_vnops.c revision 1.97
1 /* $NetBSD: ext2fs_vnops.c,v 1.97 2011/01/02 05:09:32 dholland 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 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 * 63 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94 64 * Modified for ext2fs by Manuel Bouyer. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: ext2fs_vnops.c,v 1.97 2011/01/02 05:09:32 dholland Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/resourcevar.h> 73 #include <sys/kernel.h> 74 #include <sys/file.h> 75 #include <sys/stat.h> 76 #include <sys/buf.h> 77 #include <sys/proc.h> 78 #include <sys/mount.h> 79 #include <sys/namei.h> 80 #include <sys/vnode.h> 81 #include <sys/lockf.h> 82 #include <sys/malloc.h> 83 #include <sys/pool.h> 84 #include <sys/signalvar.h> 85 #include <sys/kauth.h> 86 87 #include <miscfs/fifofs/fifo.h> 88 #include <miscfs/genfs/genfs.h> 89 #include <miscfs/specfs/specdev.h> 90 91 #include <ufs/ufs/inode.h> 92 #include <ufs/ufs/ufs_extern.h> 93 #include <ufs/ufs/ufsmount.h> 94 95 #include <ufs/ext2fs/ext2fs.h> 96 #include <ufs/ext2fs/ext2fs_extern.h> 97 #include <ufs/ext2fs/ext2fs_dir.h> 98 99 extern int prtactive; 100 101 static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *); 102 static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 103 struct lwp *); 104 105 union _qcvt { 106 int64_t qcvt; 107 int32_t val[2]; 108 }; 109 110 #define SETHIGH(q, h) { \ 111 union _qcvt tmp; \ 112 tmp.qcvt = (q); \ 113 tmp.val[_QUAD_HIGHWORD] = (h); \ 114 (q) = tmp.qcvt; \ 115 } 116 #define SETLOW(q, l) { \ 117 union _qcvt tmp; \ 118 tmp.qcvt = (q); \ 119 tmp.val[_QUAD_LOWWORD] = (l); \ 120 (q) = tmp.qcvt; \ 121 } 122 123 /* 124 * Create a regular file 125 */ 126 int 127 ext2fs_create(void *v) 128 { 129 struct vop_create_args /* { 130 struct vnode *a_dvp; 131 struct vnode **a_vpp; 132 struct componentname *a_cnp; 133 struct vattr *a_vap; 134 } */ *ap = v; 135 int error; 136 137 error = 138 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 139 ap->a_dvp, ap->a_vpp, ap->a_cnp); 140 141 if (error) 142 return (error); 143 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 144 return (0); 145 } 146 147 /* 148 * Mknod vnode call 149 */ 150 /* ARGSUSED */ 151 int 152 ext2fs_mknod(void *v) 153 { 154 struct vop_mknod_args /* { 155 struct vnode *a_dvp; 156 struct vnode **a_vpp; 157 struct componentname *a_cnp; 158 struct vattr *a_vap; 159 } */ *ap = v; 160 struct vattr *vap = ap->a_vap; 161 struct vnode **vpp = ap->a_vpp; 162 struct inode *ip; 163 int error; 164 struct mount *mp; 165 ino_t ino; 166 167 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 168 ap->a_dvp, vpp, ap->a_cnp)) != 0) 169 return (error); 170 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 171 ip = VTOI(*vpp); 172 mp = (*vpp)->v_mount; 173 ino = ip->i_number; 174 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 175 if (vap->va_rdev != VNOVAL) { 176 /* 177 * Want to be able to use this to make badblock 178 * inodes, so don't truncate the dev number. 179 */ 180 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 181 } 182 /* 183 * Remove inode so that it will be reloaded by VFS_VGET and 184 * checked to see if it is an alias of an existing entry in 185 * the inode cache. 186 */ 187 VOP_UNLOCK(*vpp); 188 (*vpp)->v_type = VNON; 189 vgone(*vpp); 190 error = VFS_VGET(mp, ino, vpp); 191 if (error != 0) { 192 *vpp = NULL; 193 return (error); 194 } 195 return (0); 196 } 197 198 /* 199 * Open called. 200 * 201 * Just check the APPEND flag. 202 */ 203 /* ARGSUSED */ 204 int 205 ext2fs_open(void *v) 206 { 207 struct vop_open_args /* { 208 struct vnode *a_vp; 209 int a_mode; 210 kauth_cred_t a_cred; 211 } */ *ap = v; 212 213 /* 214 * Files marked append-only must be opened for appending. 215 */ 216 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 217 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 218 return (EPERM); 219 return (0); 220 } 221 222 static int 223 ext2fs_check_possible(struct vnode *vp, struct inode *ip, mode_t mode) 224 { 225 226 /* 227 * Disallow write attempts on read-only file systems; 228 * unless the file is a socket, fifo, or a block or 229 * character device resident on the file system. 230 */ 231 if (mode & VWRITE) { 232 switch (vp->v_type) { 233 case VDIR: 234 case VLNK: 235 case VREG: 236 if (vp->v_mount->mnt_flag & MNT_RDONLY) 237 return (EROFS); 238 break; 239 default: 240 break; 241 } 242 } 243 244 /* If immutable bit set, nobody gets to write it. */ 245 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 246 return (EPERM); 247 248 return 0; 249 } 250 251 static int 252 ext2fs_check_permitted(struct vnode *vp, struct inode *ip, mode_t mode, 253 kauth_cred_t cred) 254 { 255 256 return genfs_can_access(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 257 ip->i_uid, ip->i_gid, mode, cred); 258 } 259 260 int 261 ext2fs_access(void *v) 262 { 263 struct vop_access_args /* { 264 struct vnode *a_vp; 265 int a_mode; 266 kauth_cred_t a_cred; 267 } */ *ap = v; 268 struct vnode *vp = ap->a_vp; 269 struct inode *ip = VTOI(vp); 270 mode_t mode = ap->a_mode; 271 int error; 272 273 error = ext2fs_check_possible(vp, ip, mode); 274 if (error) 275 return error; 276 277 error = ext2fs_check_permitted(vp, ip, mode, ap->a_cred); 278 279 return error; 280 } 281 282 /* ARGSUSED */ 283 int 284 ext2fs_getattr(void *v) 285 { 286 struct vop_getattr_args /* { 287 struct vnode *a_vp; 288 struct vattr *a_vap; 289 kauth_cred_t a_cred; 290 } */ *ap = v; 291 struct vnode *vp = ap->a_vp; 292 struct inode *ip = VTOI(vp); 293 struct vattr *vap = ap->a_vap; 294 295 EXT2FS_ITIMES(ip, NULL, NULL, NULL); 296 /* 297 * Copy from inode table 298 */ 299 vap->va_fsid = ip->i_dev; 300 vap->va_fileid = ip->i_number; 301 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 302 vap->va_nlink = ip->i_e2fs_nlink; 303 vap->va_uid = ip->i_uid; 304 vap->va_gid = ip->i_gid; 305 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 306 vap->va_size = vp->v_size; 307 vap->va_atime.tv_sec = ip->i_e2fs_atime; 308 vap->va_atime.tv_nsec = 0; 309 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 310 vap->va_mtime.tv_nsec = 0; 311 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 312 vap->va_ctime.tv_nsec = 0; 313 #ifdef EXT2FS_SYSTEM_FLAGS 314 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 315 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 316 #else 317 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 318 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 319 #endif 320 vap->va_gen = ip->i_e2fs_gen; 321 /* this doesn't belong here */ 322 if (vp->v_type == VBLK) 323 vap->va_blocksize = BLKDEV_IOSIZE; 324 else if (vp->v_type == VCHR) 325 vap->va_blocksize = MAXBSIZE; 326 else 327 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 328 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 329 vap->va_type = vp->v_type; 330 vap->va_filerev = ip->i_modrev; 331 return (0); 332 } 333 334 /* 335 * Set attribute vnode op. called from several syscalls 336 */ 337 int 338 ext2fs_setattr(void *v) 339 { 340 struct vop_setattr_args /* { 341 struct vnode *a_vp; 342 struct vattr *a_vap; 343 kauth_cred_t a_cred; 344 } */ *ap = v; 345 struct vattr *vap = ap->a_vap; 346 struct vnode *vp = ap->a_vp; 347 struct inode *ip = VTOI(vp); 348 kauth_cred_t cred = ap->a_cred; 349 struct lwp *l = curlwp; 350 int error; 351 352 /* 353 * Check for unsettable attributes. 354 */ 355 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 356 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 357 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 358 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 359 return (EINVAL); 360 } 361 if (vap->va_flags != VNOVAL) { 362 if (vp->v_mount->mnt_flag & MNT_RDONLY) 363 return (EROFS); 364 if (kauth_cred_geteuid(cred) != ip->i_uid && 365 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 366 NULL))) 367 return (error); 368 #ifdef EXT2FS_SYSTEM_FLAGS 369 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 370 NULL) == 0) { 371 if ((ip->i_e2fs_flags & 372 (EXT2_APPEND | EXT2_IMMUTABLE)) && 373 kauth_authorize_system(l->l_cred, 374 KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL)) 375 return (EPERM); 376 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 377 ip->i_e2fs_flags |= 378 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 379 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 380 } else 381 return (EPERM); 382 #else 383 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 384 ip->i_e2fs_flags |= 385 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 386 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 387 #endif 388 ip->i_flag |= IN_CHANGE; 389 if (vap->va_flags & (IMMUTABLE | APPEND)) 390 return (0); 391 } 392 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 393 return (EPERM); 394 /* 395 * Go through the fields and update iff not VNOVAL. 396 */ 397 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 398 if (vp->v_mount->mnt_flag & MNT_RDONLY) 399 return (EROFS); 400 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 401 if (error) 402 return (error); 403 } 404 if (vap->va_size != VNOVAL) { 405 /* 406 * Disallow write attempts on read-only file systems; 407 * unless the file is a socket, fifo, or a block or 408 * character device resident on the file system. 409 */ 410 switch (vp->v_type) { 411 case VDIR: 412 return (EISDIR); 413 case VLNK: 414 case VREG: 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return (EROFS); 417 default: 418 break; 419 } 420 error = ext2fs_truncate(vp, vap->va_size, 0, cred); 421 if (error) 422 return (error); 423 } 424 ip = VTOI(vp); 425 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 426 if (vp->v_mount->mnt_flag & MNT_RDONLY) 427 return (EROFS); 428 error = genfs_can_chtimes(vp, vap->va_vaflags, ip->i_uid, cred); 429 if (error) 430 return (error); 431 if (vap->va_atime.tv_sec != VNOVAL) 432 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 433 ip->i_flag |= IN_ACCESS; 434 if (vap->va_mtime.tv_sec != VNOVAL) 435 ip->i_flag |= IN_CHANGE | IN_UPDATE; 436 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 437 UPDATE_WAIT); 438 if (error) 439 return (error); 440 } 441 error = 0; 442 if (vap->va_mode != (mode_t)VNOVAL) { 443 if (vp->v_mount->mnt_flag & MNT_RDONLY) 444 return (EROFS); 445 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l); 446 } 447 VN_KNOTE(vp, NOTE_ATTRIB); 448 return (error); 449 } 450 451 /* 452 * Change the mode on a file. 453 * Inode must be locked before calling. 454 */ 455 static int 456 ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l) 457 { 458 struct inode *ip = VTOI(vp); 459 int error; 460 461 error = genfs_can_chmod(vp, cred, ip->i_uid, ip->i_gid, mode); 462 if (error) 463 return (error); 464 465 ip->i_e2fs_mode &= ~ALLPERMS; 466 ip->i_e2fs_mode |= (mode & ALLPERMS); 467 ip->i_flag |= IN_CHANGE; 468 return (0); 469 } 470 471 /* 472 * Perform chown operation on inode ip; 473 * inode must be locked prior to call. 474 */ 475 static int 476 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 477 struct lwp *l) 478 { 479 struct inode *ip = VTOI(vp); 480 uid_t ouid; 481 gid_t ogid; 482 int error; 483 484 if (uid == (uid_t)VNOVAL) 485 uid = ip->i_uid; 486 if (gid == (gid_t)VNOVAL) 487 gid = ip->i_gid; 488 489 error = genfs_can_chown(vp, cred, ip->i_uid, ip->i_gid, uid, gid); 490 if (error) 491 return (error); 492 493 ogid = ip->i_gid; 494 ouid = ip->i_uid; 495 496 ip->i_e2fs_gid = gid & 0xffff; 497 ip->i_e2fs_uid = uid & 0xffff; 498 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 499 ip->i_e2fs_gid_high = (gid >> 16) & 0xffff; 500 ip->i_e2fs_uid_high = (uid >> 16) & 0xffff; 501 } else { 502 ip->i_e2fs_gid_high = 0; 503 ip->i_e2fs_uid_high = 0; 504 } 505 if (ouid != uid || ogid != gid) { 506 ext2fs_set_inode_guid(ip); 507 ip->i_flag |= IN_CHANGE; 508 } 509 if (ouid != uid && kauth_authorize_generic(cred, 510 KAUTH_GENERIC_ISSUSER, NULL) != 0) 511 ip->i_e2fs_mode &= ~ISUID; 512 if (ogid != gid && kauth_authorize_generic(cred, 513 KAUTH_GENERIC_ISSUSER, NULL) != 0) 514 ip->i_e2fs_mode &= ~ISGID; 515 return (0); 516 } 517 518 int 519 ext2fs_remove(void *v) 520 { 521 struct vop_remove_args /* { 522 struct vnode *a_dvp; 523 struct vnode *a_vp; 524 struct componentname *a_cnp; 525 } */ *ap = v; 526 struct inode *ip; 527 struct vnode *vp = ap->a_vp; 528 struct vnode *dvp = ap->a_dvp; 529 int error; 530 531 ip = VTOI(vp); 532 if (vp->v_type == VDIR || 533 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 534 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 535 error = EPERM; 536 } else { 537 error = ext2fs_dirremove(dvp, ap->a_cnp); 538 if (error == 0) { 539 ip->i_e2fs_nlink--; 540 ip->i_flag |= IN_CHANGE; 541 } 542 } 543 544 VN_KNOTE(vp, NOTE_DELETE); 545 VN_KNOTE(dvp, NOTE_WRITE); 546 if (dvp == vp) 547 vrele(vp); 548 else 549 vput(vp); 550 vput(dvp); 551 return (error); 552 } 553 554 /* 555 * link vnode call 556 */ 557 int 558 ext2fs_link(void *v) 559 { 560 struct vop_link_args /* { 561 struct vnode *a_dvp; 562 struct vnode *a_vp; 563 struct componentname *a_cnp; 564 } */ *ap = v; 565 struct vnode *dvp = ap->a_dvp; 566 struct vnode *vp = ap->a_vp; 567 struct componentname *cnp = ap->a_cnp; 568 struct inode *ip; 569 int error; 570 571 if (vp->v_type == VDIR) { 572 VOP_ABORTOP(dvp, cnp); 573 error = EISDIR; 574 goto out2; 575 } 576 if (dvp->v_mount != vp->v_mount) { 577 VOP_ABORTOP(dvp, cnp); 578 error = EXDEV; 579 goto out2; 580 } 581 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 582 VOP_ABORTOP(dvp, cnp); 583 goto out2; 584 } 585 ip = VTOI(vp); 586 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 587 VOP_ABORTOP(dvp, cnp); 588 error = EMLINK; 589 goto out1; 590 } 591 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 592 VOP_ABORTOP(dvp, cnp); 593 error = EPERM; 594 goto out1; 595 } 596 ip->i_e2fs_nlink++; 597 ip->i_flag |= IN_CHANGE; 598 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 599 if (!error) 600 error = ext2fs_direnter(ip, dvp, cnp); 601 if (error) { 602 ip->i_e2fs_nlink--; 603 ip->i_flag |= IN_CHANGE; 604 } 605 out1: 606 if (dvp != vp) 607 VOP_UNLOCK(vp); 608 out2: 609 VN_KNOTE(vp, NOTE_LINK); 610 VN_KNOTE(dvp, NOTE_WRITE); 611 vput(dvp); 612 return (error); 613 } 614 615 /* 616 * Rename system call. 617 * rename("foo", "bar"); 618 * is essentially 619 * unlink("bar"); 620 * link("foo", "bar"); 621 * unlink("foo"); 622 * but ``atomically''. Can't do full commit without saving state in the 623 * inode on disk which isn't feasible at this time. Best we can do is 624 * always guarantee the target exists. 625 * 626 * Basic algorithm is: 627 * 628 * 1) Bump link count on source while we're linking it to the 629 * target. This also ensure the inode won't be deleted out 630 * from underneath us while we work (it may be truncated by 631 * a concurrent `trunc' or `open' for creation). 632 * 2) Link source to destination. If destination already exists, 633 * delete it first. 634 * 3) Unlink source reference to inode if still around. If a 635 * directory was moved and the parent of the destination 636 * is different from the source, patch the ".." entry in the 637 * directory. 638 */ 639 int 640 ext2fs_rename(void *v) 641 { 642 struct vop_rename_args /* { 643 struct vnode *a_fdvp; 644 struct vnode *a_fvp; 645 struct componentname *a_fcnp; 646 struct vnode *a_tdvp; 647 struct vnode *a_tvp; 648 struct componentname *a_tcnp; 649 } */ *ap = v; 650 struct vnode *tvp = ap->a_tvp; 651 struct vnode *tdvp = ap->a_tdvp; 652 struct vnode *fvp = ap->a_fvp; 653 struct vnode *fdvp = ap->a_fdvp; 654 struct componentname *tcnp = ap->a_tcnp; 655 struct componentname *fcnp = ap->a_fcnp; 656 struct inode *ip, *xp, *dp; 657 struct ext2fs_dirtemplate dirbuf; 658 int doingdirectory = 0, oldparent = 0, newparent = 0; 659 int error = 0; 660 u_char namlen; 661 662 /* 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); 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, 0))) { 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); 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); 725 error = EPERM; 726 goto abortit; 727 } 728 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 729 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 730 if (!error && tvp) 731 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred); 732 if (error) { 733 VOP_UNLOCK(fvp); 734 error = EACCES; 735 goto abortit; 736 } 737 /* 738 * Avoid ".", "..", and aliases of "." for obvious reasons. 739 */ 740 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 741 dp == ip || 742 (fcnp->cn_flags & ISDOTDOT) || 743 (tcnp->cn_flags & ISDOTDOT) || 744 (ip->i_flag & IN_RENAME)) { 745 VOP_UNLOCK(fvp); 746 error = EINVAL; 747 goto abortit; 748 } 749 ip->i_flag |= IN_RENAME; 750 oldparent = dp->i_number; 751 doingdirectory = 1; 752 } 753 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 754 755 /* 756 * When the target exists, both the directory 757 * and target vnodes are returned locked. 758 */ 759 dp = VTOI(tdvp); 760 xp = NULL; 761 if (tvp) 762 xp = VTOI(tvp); 763 764 /* 765 * 1) Bump link count while we're moving stuff 766 * around. If we crash somewhere before 767 * completing our work, the link count 768 * may be wrong, but correctable. 769 */ 770 ip->i_e2fs_nlink++; 771 ip->i_flag |= IN_CHANGE; 772 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 773 VOP_UNLOCK(fvp); 774 goto bad; 775 } 776 777 /* 778 * If ".." must be changed (ie the directory gets a new 779 * parent) then the source directory must not be in the 780 * directory hierarchy above the target, as this would 781 * orphan everything below the source directory. Also 782 * the user must have write permission in the source so 783 * as to be able to change "..". We must repeat the call 784 * to namei, as the parent directory is unlocked by the 785 * call to checkpath(). 786 */ 787 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 788 VOP_UNLOCK(fvp); 789 if (oldparent != dp->i_number) 790 newparent = dp->i_number; 791 if (doingdirectory && newparent) { 792 if (error) /* write access check above */ 793 goto bad; 794 if (xp != NULL) 795 vput(tvp); 796 vref(tdvp); /* compensate for the ref checkpath loses */ 797 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 798 if (error != 0) { 799 vrele(tdvp); 800 goto out; 801 } 802 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 803 if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { 804 vput(tdvp); 805 goto out; 806 } 807 dp = VTOI(tdvp); 808 xp = NULL; 809 if (tvp) 810 xp = VTOI(tvp); 811 } 812 /* 813 * 2) If target doesn't exist, link the target 814 * to the source and unlink the source. 815 * Otherwise, rewrite the target directory 816 * entry to reference the source inode and 817 * expunge the original entry's existence. 818 */ 819 if (xp == NULL) { 820 if (dp->i_dev != ip->i_dev) 821 panic("rename: EXDEV"); 822 /* 823 * Account for ".." in new directory. 824 * When source and destination have the same 825 * parent we don't fool with the link count. 826 */ 827 if (doingdirectory && newparent) { 828 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 829 error = EMLINK; 830 goto bad; 831 } 832 dp->i_e2fs_nlink++; 833 dp->i_flag |= IN_CHANGE; 834 if ((error = ext2fs_update(tdvp, NULL, NULL, 835 UPDATE_WAIT)) != 0) 836 goto bad; 837 } 838 error = ext2fs_direnter(ip, tdvp, tcnp); 839 if (error != 0) { 840 if (doingdirectory && newparent) { 841 dp->i_e2fs_nlink--; 842 dp->i_flag |= IN_CHANGE; 843 (void)ext2fs_update(tdvp, NULL, NULL, 844 UPDATE_WAIT); 845 } 846 goto bad; 847 } 848 VN_KNOTE(tdvp, NOTE_WRITE); 849 vput(tdvp); 850 } else { 851 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 852 panic("rename: EXDEV"); 853 /* 854 * Short circuit rename(foo, foo). 855 */ 856 if (xp->i_number == ip->i_number) 857 panic("rename: same file"); 858 /* 859 * If the parent directory is "sticky", then the user must 860 * own the parent directory, or the destination of the rename, 861 * otherwise the destination may not be changed (except by 862 * root). This implements append-only directories. 863 */ 864 if ((dp->i_e2fs_mode & S_ISTXT) && 865 kauth_authorize_generic(tcnp->cn_cred, 866 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 867 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_uid && 868 xp->i_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); 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); 934 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 935 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 936 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 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, (void *)&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 (void *)&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 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1054 error = EMLINK; 1055 goto out; 1056 } 1057 dmode = vap->va_mode & ACCESSPERMS; 1058 dmode |= IFDIR; 1059 /* 1060 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1061 * but not have it entered in the parent directory. The entry is 1062 * made later after writing "." and ".." entries. 1063 */ 1064 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1065 goto out; 1066 ip = VTOI(tvp); 1067 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1068 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1069 ip->i_e2fs_gid = dp->i_e2fs_gid; 1070 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1071 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1072 ip->i_e2fs_gid_high = dp->i_e2fs_gid_high; 1073 } else { 1074 ip->i_e2fs_uid_high = 0; 1075 ip->i_e2fs_gid_high = 0; 1076 } 1077 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1078 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1079 ip->i_e2fs_mode = dmode; 1080 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1081 ip->i_e2fs_nlink = 2; 1082 1083 /* 1084 * Bump link count in parent directory 1085 * to reflect work done below. Should 1086 * be done before reference is created 1087 * so reparation is possible if we crash. 1088 */ 1089 dp->i_e2fs_nlink++; 1090 dp->i_flag |= IN_CHANGE; 1091 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1092 goto bad; 1093 1094 /* Initialize directory with "." and ".." from static template. */ 1095 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1096 dirtemplate.dot_ino = h2fs32(ip->i_number); 1097 dirtemplate.dot_reclen = h2fs16(12); 1098 dirtemplate.dot_namlen = 1; 1099 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1100 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1101 dirtemplate.dot_type = EXT2_FT_DIR; 1102 } 1103 dirtemplate.dot_name[0] = '.'; 1104 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1105 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1106 dirtemplate.dotdot_namlen = 2; 1107 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1108 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1109 dirtemplate.dotdot_type = EXT2_FT_DIR; 1110 } 1111 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1112 error = vn_rdwr(UIO_WRITE, tvp, (void *)&dirtemplate, 1113 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1114 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1115 if (error) { 1116 dp->i_e2fs_nlink--; 1117 dp->i_flag |= IN_CHANGE; 1118 goto bad; 1119 } 1120 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1121 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1122 else { 1123 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1124 if (error) { 1125 dp->i_e2fs_nlink--; 1126 dp->i_flag |= IN_CHANGE; 1127 goto bad; 1128 } 1129 ip->i_flag |= IN_CHANGE; 1130 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1131 } 1132 1133 /* Directory set up, now install it's entry in the parent directory. */ 1134 error = ext2fs_direnter(ip, dvp, cnp); 1135 if (error != 0) { 1136 dp->i_e2fs_nlink--; 1137 dp->i_flag |= IN_CHANGE; 1138 } 1139 bad: 1140 /* 1141 * No need to do an explicit ext2fs_truncate here, vrele will do this 1142 * for us because we set the link count to 0. 1143 */ 1144 if (error) { 1145 ip->i_e2fs_nlink = 0; 1146 ip->i_flag |= IN_CHANGE; 1147 vput(tvp); 1148 } else { 1149 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1150 *ap->a_vpp = tvp; 1151 } 1152 out: 1153 vput(dvp); 1154 return (error); 1155 } 1156 1157 /* 1158 * Rmdir system call. 1159 */ 1160 int 1161 ext2fs_rmdir(void *v) 1162 { 1163 struct vop_rmdir_args /* { 1164 struct vnode *a_dvp; 1165 struct vnode *a_vp; 1166 struct componentname *a_cnp; 1167 } */ *ap = v; 1168 struct vnode *vp = ap->a_vp; 1169 struct vnode *dvp = ap->a_dvp; 1170 struct componentname *cnp = ap->a_cnp; 1171 struct inode *ip, *dp; 1172 int error; 1173 1174 ip = VTOI(vp); 1175 dp = VTOI(dvp); 1176 /* 1177 * No rmdir "." please. 1178 */ 1179 if (dp == ip) { 1180 vrele(dvp); 1181 vput(vp); 1182 return (EINVAL); 1183 } 1184 /* 1185 * Verify the directory is empty (and valid). 1186 * (Rmdir ".." won't be valid since 1187 * ".." will contain a reference to 1188 * the current directory and thus be 1189 * non-empty.) 1190 */ 1191 error = 0; 1192 if (ip->i_e2fs_nlink != 2 || 1193 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1194 error = ENOTEMPTY; 1195 goto out; 1196 } 1197 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1198 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1199 error = EPERM; 1200 goto out; 1201 } 1202 /* 1203 * Delete reference to directory before purging 1204 * inode. If we crash in between, the directory 1205 * will be reattached to lost+found, 1206 */ 1207 error = ext2fs_dirremove(dvp, cnp); 1208 if (error != 0) 1209 goto out; 1210 dp->i_e2fs_nlink--; 1211 dp->i_flag |= IN_CHANGE; 1212 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1213 cache_purge(dvp); 1214 vput(dvp); 1215 dvp = NULL; 1216 /* 1217 * Truncate inode. The only stuff left 1218 * in the directory is "." and "..". The 1219 * "." reference is inconsequential since 1220 * we're quashing it. The ".." reference 1221 * has already been adjusted above. We've 1222 * removed the "." reference and the reference 1223 * in the parent directory, but there may be 1224 * other hard links so decrement by 2 and 1225 * worry about them later. 1226 */ 1227 ip->i_e2fs_nlink -= 2; 1228 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred); 1229 cache_purge(ITOV(ip)); 1230 out: 1231 VN_KNOTE(vp, NOTE_DELETE); 1232 if (dvp) 1233 vput(dvp); 1234 vput(vp); 1235 return (error); 1236 } 1237 1238 /* 1239 * symlink -- make a symbolic link 1240 */ 1241 int 1242 ext2fs_symlink(void *v) 1243 { 1244 struct vop_symlink_args /* { 1245 struct vnode *a_dvp; 1246 struct vnode **a_vpp; 1247 struct componentname *a_cnp; 1248 struct vattr *a_vap; 1249 char *a_target; 1250 } */ *ap = v; 1251 struct vnode *vp, **vpp; 1252 struct inode *ip; 1253 int len, error; 1254 1255 vpp = ap->a_vpp; 1256 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1257 vpp, ap->a_cnp); 1258 if (error) 1259 return (error); 1260 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1261 vp = *vpp; 1262 len = strlen(ap->a_target); 1263 ip = VTOI(vp); 1264 if (len < ip->i_ump->um_maxsymlinklen) { 1265 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1266 error = ext2fs_setsize(ip, len); 1267 if (error) 1268 goto bad; 1269 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1270 uvm_vnp_setsize(vp, len); 1271 } else 1272 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1273 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1274 (size_t *)0, NULL); 1275 bad: 1276 if (error) 1277 vput(vp); 1278 return (error); 1279 } 1280 1281 /* 1282 * Return target name of a symbolic link 1283 */ 1284 int 1285 ext2fs_readlink(void *v) 1286 { 1287 struct vop_readlink_args /* { 1288 struct vnode *a_vp; 1289 struct uio *a_uio; 1290 kauth_cred_t a_cred; 1291 } */ *ap = v; 1292 struct vnode *vp = ap->a_vp; 1293 struct inode *ip = VTOI(vp); 1294 struct ufsmount *ump = ip->i_ump; 1295 int isize; 1296 1297 isize = ext2fs_size(ip); 1298 if (isize < ump->um_maxsymlinklen || 1299 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1300 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1301 return (0); 1302 } 1303 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1304 } 1305 1306 /* 1307 * Advisory record locking support 1308 */ 1309 int 1310 ext2fs_advlock(void *v) 1311 { 1312 struct vop_advlock_args /* { 1313 struct vnode *a_vp; 1314 void * a_id; 1315 int a_op; 1316 struct flock *a_fl; 1317 int a_flags; 1318 } */ *ap = v; 1319 struct inode *ip = VTOI(ap->a_vp); 1320 1321 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1322 } 1323 1324 int 1325 ext2fs_fsync(void *v) 1326 { 1327 struct vop_fsync_args /* { 1328 struct vnode *a_vp; 1329 kauth_cred_t a_cred; 1330 int a_flags; 1331 off_t offlo; 1332 off_t offhi; 1333 struct proc *a_p; 1334 } */ *ap = v; 1335 struct vnode *vp = ap->a_vp; 1336 int wait; 1337 int error; 1338 1339 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1340 1341 if (vp->v_type == VBLK) 1342 spec_fsync(v); 1343 else 1344 vflushbuf(vp, wait); 1345 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1346 error = 0; 1347 else 1348 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1349 1350 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1351 int l = 0; 1352 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1353 curlwp->l_cred); 1354 } 1355 1356 return error; 1357 } 1358 1359 /* 1360 * Initialize the vnode associated with a new inode, handle aliased 1361 * vnodes. 1362 */ 1363 int 1364 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1365 int (**fifoops)(void *), struct vnode **vpp) 1366 { 1367 struct timeval tv; 1368 struct inode *ip; 1369 struct vnode *vp; 1370 1371 vp = *vpp; 1372 ip = VTOI(vp); 1373 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1374 case VCHR: 1375 case VBLK: 1376 vp->v_op = specops; 1377 spec_node_init(vp, fs2h32(ip->i_din.e2fs_din->e2di_rdev)); 1378 break; 1379 case VFIFO: 1380 vp->v_op = fifoops; 1381 break; 1382 case VNON: 1383 case VBAD: 1384 case VSOCK: 1385 case VLNK: 1386 case VDIR: 1387 case VREG: 1388 break; 1389 } 1390 if (ip->i_number == ROOTINO) 1391 vp->v_vflag |= VV_ROOT; 1392 /* 1393 * Initialize modrev times 1394 */ 1395 getmicrouptime(&tv); 1396 SETHIGH(ip->i_modrev, tv.tv_sec); 1397 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1398 *vpp = vp; 1399 return (0); 1400 } 1401 1402 /* 1403 * Allocate a new inode. 1404 */ 1405 int 1406 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1407 struct componentname *cnp) 1408 { 1409 struct inode *ip, *pdir; 1410 struct vnode *tvp; 1411 int error, ismember = 0; 1412 1413 pdir = VTOI(dvp); 1414 *vpp = NULL; 1415 if ((mode & IFMT) == 0) 1416 mode |= IFREG; 1417 1418 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1419 vput(dvp); 1420 return (error); 1421 } 1422 ip = VTOI(tvp); 1423 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1424 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1425 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1426 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1427 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1428 ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high; 1429 } else { 1430 ip->i_e2fs_uid_high = 0; 1431 ip->i_e2fs_gid_high = 0; 1432 } 1433 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1434 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1435 ip->i_e2fs_mode = mode; 1436 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1437 ip->i_e2fs_nlink = 1; 1438 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1439 ip->i_gid, &ismember) != 0 || !ismember) && 1440 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1441 ip->i_e2fs_mode &= ~ISGID; 1442 1443 /* 1444 * Make sure inode goes to disk before directory entry. 1445 */ 1446 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1447 goto bad; 1448 error = ext2fs_direnter(ip, dvp, cnp); 1449 if (error != 0) 1450 goto bad; 1451 vput(dvp); 1452 *vpp = tvp; 1453 return (0); 1454 1455 bad: 1456 /* 1457 * Write error occurred trying to update the inode 1458 * or the directory so must deallocate the inode. 1459 */ 1460 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1461 ip->i_e2fs_nlink = 0; 1462 ip->i_flag |= IN_CHANGE; 1463 vput(tvp); 1464 vput(dvp); 1465 return (error); 1466 } 1467 1468 /* 1469 * Reclaim an inode so that it can be used for other purposes. 1470 */ 1471 int 1472 ext2fs_reclaim(void *v) 1473 { 1474 struct vop_reclaim_args /* { 1475 struct vnode *a_vp; 1476 } */ *ap = v; 1477 struct vnode *vp = ap->a_vp; 1478 struct inode *ip = VTOI(vp); 1479 int error; 1480 1481 /* 1482 * The inode must be freed and updated before being removed 1483 * from its hash chain. Other threads trying to gain a hold 1484 * on the inode will be stalled because it is locked (VI_XLOCK). 1485 */ 1486 if (ip->i_omode == 1 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1487 ext2fs_vfree(vp, ip->i_number, ip->i_e2fs_mode); 1488 if ((error = ufs_reclaim(vp)) != 0) 1489 return (error); 1490 if (ip->i_din.e2fs_din != NULL) 1491 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1492 genfs_node_destroy(vp); 1493 pool_put(&ext2fs_inode_pool, vp->v_data); 1494 vp->v_data = NULL; 1495 return (0); 1496 } 1497 1498 /* Global vfs data structures for ext2fs. */ 1499 int (**ext2fs_vnodeop_p)(void *); 1500 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1501 { &vop_default_desc, vn_default_error }, 1502 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1503 { &vop_create_desc, ext2fs_create }, /* create */ 1504 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1505 { &vop_open_desc, ext2fs_open }, /* open */ 1506 { &vop_close_desc, ufs_close }, /* close */ 1507 { &vop_access_desc, ext2fs_access }, /* access */ 1508 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1509 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1510 { &vop_read_desc, ext2fs_read }, /* read */ 1511 { &vop_write_desc, ext2fs_write }, /* write */ 1512 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1513 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1514 { &vop_poll_desc, ufs_poll }, /* poll */ 1515 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1516 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1517 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1518 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1519 { &vop_seek_desc, ufs_seek }, /* seek */ 1520 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1521 { &vop_link_desc, ext2fs_link }, /* link */ 1522 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1523 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1524 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1525 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1526 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1527 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1528 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1529 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1530 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1531 { &vop_lock_desc, ufs_lock }, /* lock */ 1532 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1533 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1534 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1535 { &vop_print_desc, ufs_print }, /* print */ 1536 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1537 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1538 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1539 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1540 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1541 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1542 { NULL, NULL } 1543 }; 1544 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1545 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1546 1547 int (**ext2fs_specop_p)(void *); 1548 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1549 { &vop_default_desc, vn_default_error }, 1550 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1551 { &vop_create_desc, spec_create }, /* create */ 1552 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1553 { &vop_open_desc, spec_open }, /* open */ 1554 { &vop_close_desc, ufsspec_close }, /* close */ 1555 { &vop_access_desc, ext2fs_access }, /* access */ 1556 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1557 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1558 { &vop_read_desc, ufsspec_read }, /* read */ 1559 { &vop_write_desc, ufsspec_write }, /* write */ 1560 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1561 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1562 { &vop_poll_desc, spec_poll }, /* poll */ 1563 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1564 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1565 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1566 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1567 { &vop_seek_desc, spec_seek }, /* seek */ 1568 { &vop_remove_desc, spec_remove }, /* remove */ 1569 { &vop_link_desc, spec_link }, /* link */ 1570 { &vop_rename_desc, spec_rename }, /* rename */ 1571 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1572 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1573 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1574 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1575 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1576 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1577 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1578 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1579 { &vop_lock_desc, ufs_lock }, /* lock */ 1580 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1581 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1582 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1583 { &vop_print_desc, ufs_print }, /* print */ 1584 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1585 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1586 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1587 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1588 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1589 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1590 { NULL, NULL } 1591 }; 1592 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1593 { &ext2fs_specop_p, ext2fs_specop_entries }; 1594 1595 int (**ext2fs_fifoop_p)(void *); 1596 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1597 { &vop_default_desc, vn_default_error }, 1598 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 1599 { &vop_create_desc, vn_fifo_bypass }, /* create */ 1600 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 1601 { &vop_open_desc, vn_fifo_bypass }, /* open */ 1602 { &vop_close_desc, ufsfifo_close }, /* close */ 1603 { &vop_access_desc, ext2fs_access }, /* access */ 1604 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1605 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1606 { &vop_read_desc, ufsfifo_read }, /* read */ 1607 { &vop_write_desc, ufsfifo_write }, /* write */ 1608 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 1609 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1610 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 1611 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 1612 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 1613 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 1614 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1615 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 1616 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 1617 { &vop_link_desc, vn_fifo_bypass }, /* link */ 1618 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 1619 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 1620 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 1621 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 1622 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 1623 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 1624 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 1625 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1626 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1627 { &vop_lock_desc, ufs_lock }, /* lock */ 1628 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1629 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 1630 { &vop_strategy_desc, vn_fifo_bypass }, /* strategy */ 1631 { &vop_print_desc, ufs_print }, /* print */ 1632 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1633 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 1634 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 1635 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1636 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 1637 { NULL, NULL } 1638 }; 1639 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1640 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1641
Indexes created Mon Sep 29 15:09:53 GMT 2025