ext2fs_vnops.c revision 1.64.10.4
1 /* $NetBSD: ext2fs_vnops.c,v 1.64.10.4 2006/03/11 16:45:25 elad 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 1.64.10.4 2006/03/11 16:45:25 elad 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 91 #include <miscfs/fifofs/fifo.h> 92 #include <miscfs/genfs/genfs.h> 93 #include <miscfs/specfs/specdev.h> 94 95 #include <ufs/ufs/inode.h> 96 #include <ufs/ufs/ufs_extern.h> 97 #include <ufs/ufs/ufsmount.h> 98 99 #include <ufs/ext2fs/ext2fs.h> 100 #include <ufs/ext2fs/ext2fs_extern.h> 101 #include <ufs/ext2fs/ext2fs_dir.h> 102 103 extern int prtactive; 104 105 static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct proc *); 106 static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 107 struct proc *); 108 109 union _qcvt { 110 int64_t qcvt; 111 int32_t val[2]; 112 }; 113 114 #define SETHIGH(q, h) { \ 115 union _qcvt tmp; \ 116 tmp.qcvt = (q); \ 117 tmp.val[_QUAD_HIGHWORD] = (h); \ 118 (q) = tmp.qcvt; \ 119 } 120 #define SETLOW(q, l) { \ 121 union _qcvt tmp; \ 122 tmp.qcvt = (q); \ 123 tmp.val[_QUAD_LOWWORD] = (l); \ 124 (q) = tmp.qcvt; \ 125 } 126 127 /* 128 * Create a regular file 129 */ 130 int 131 ext2fs_create(void *v) 132 { 133 struct vop_create_args /* { 134 struct vnode *a_dvp; 135 struct vnode **a_vpp; 136 struct componentname *a_cnp; 137 struct vattr *a_vap; 138 } */ *ap = v; 139 int error; 140 141 error = 142 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 143 ap->a_dvp, ap->a_vpp, ap->a_cnp); 144 145 if (error) 146 return (error); 147 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 148 return (0); 149 } 150 151 /* 152 * Mknod vnode call 153 */ 154 /* ARGSUSED */ 155 int 156 ext2fs_mknod(void *v) 157 { 158 struct vop_mknod_args /* { 159 struct vnode *a_dvp; 160 struct vnode **a_vpp; 161 struct componentname *a_cnp; 162 struct vattr *a_vap; 163 } */ *ap = v; 164 struct vattr *vap = ap->a_vap; 165 struct vnode **vpp = ap->a_vpp; 166 struct inode *ip; 167 int error; 168 struct mount *mp; 169 ino_t ino; 170 171 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 172 ap->a_dvp, vpp, ap->a_cnp)) != 0) 173 return (error); 174 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 175 ip = VTOI(*vpp); 176 mp = (*vpp)->v_mount; 177 ino = ip->i_number; 178 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 179 if (vap->va_rdev != VNOVAL) { 180 /* 181 * Want to be able to use this to make badblock 182 * inodes, so don't truncate the dev number. 183 */ 184 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 185 } 186 /* 187 * Remove inode so that it will be reloaded by VFS_VGET and 188 * checked to see if it is an alias of an existing entry in 189 * the inode cache. 190 */ 191 vput(*vpp); 192 (*vpp)->v_type = VNON; 193 vgone(*vpp); 194 error = VFS_VGET(mp, ino, vpp); 195 if (error != 0) { 196 *vpp = NULL; 197 return (error); 198 } 199 return (0); 200 } 201 202 /* 203 * Open called. 204 * 205 * Just check the APPEND flag. 206 */ 207 /* ARGSUSED */ 208 int 209 ext2fs_open(void *v) 210 { 211 struct vop_open_args /* { 212 struct vnode *a_vp; 213 int a_mode; 214 kauth_cred_t a_cred; 215 struct lwp *a_l; 216 } */ *ap = v; 217 218 /* 219 * Files marked append-only must be opened for appending. 220 */ 221 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 222 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 223 return (EPERM); 224 return (0); 225 } 226 227 int 228 ext2fs_access(void *v) 229 { 230 struct vop_access_args /* { 231 struct vnode *a_vp; 232 int a_mode; 233 kauth_cred_t a_cred; 234 struct lwp *a_l; 235 } */ *ap = v; 236 struct vnode *vp = ap->a_vp; 237 struct inode *ip = VTOI(vp); 238 mode_t mode = ap->a_mode; 239 240 /* 241 * Disallow write attempts on read-only file systems; 242 * unless the file is a socket, fifo, or a block or 243 * character device resident on the file system. 244 */ 245 if (mode & VWRITE) { 246 switch (vp->v_type) { 247 case VDIR: 248 case VLNK: 249 case VREG: 250 if (vp->v_mount->mnt_flag & MNT_RDONLY) 251 return (EROFS); 252 break; 253 default: 254 break; 255 } 256 } 257 258 /* If immutable bit set, nobody gets to write it. */ 259 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 260 return (EPERM); 261 262 return (vaccess(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 263 ip->i_e2fs_uid, ip->i_e2fs_gid, mode, ap->a_cred)); 264 } 265 266 /* ARGSUSED */ 267 int 268 ext2fs_getattr(void *v) 269 { 270 struct vop_getattr_args /* { 271 struct vnode *a_vp; 272 struct vattr *a_vap; 273 kauth_cred_t a_cred; 274 struct lwp *a_l; 275 } */ *ap = v; 276 struct vnode *vp = ap->a_vp; 277 struct inode *ip = VTOI(vp); 278 struct vattr *vap = ap->a_vap; 279 280 EXT2FS_ITIMES(ip, NULL, NULL, NULL); 281 /* 282 * Copy from inode table 283 */ 284 vap->va_fsid = ip->i_dev; 285 vap->va_fileid = ip->i_number; 286 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 287 vap->va_nlink = ip->i_e2fs_nlink; 288 vap->va_uid = ip->i_e2fs_uid; 289 vap->va_gid = ip->i_e2fs_gid; 290 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 291 vap->va_size = vp->v_size; 292 vap->va_atime.tv_sec = ip->i_e2fs_atime; 293 vap->va_atime.tv_nsec = 0; 294 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 295 vap->va_mtime.tv_nsec = 0; 296 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 297 vap->va_ctime.tv_nsec = 0; 298 #ifdef EXT2FS_SYSTEM_FLAGS 299 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 300 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 301 #else 302 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 303 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 304 #endif 305 vap->va_gen = ip->i_e2fs_gen; 306 /* this doesn't belong here */ 307 if (vp->v_type == VBLK) 308 vap->va_blocksize = BLKDEV_IOSIZE; 309 else if (vp->v_type == VCHR) 310 vap->va_blocksize = MAXBSIZE; 311 else 312 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 313 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 314 vap->va_type = vp->v_type; 315 vap->va_filerev = ip->i_modrev; 316 return (0); 317 } 318 319 /* 320 * Set attribute vnode op. called from several syscalls 321 */ 322 int 323 ext2fs_setattr(void *v) 324 { 325 struct vop_setattr_args /* { 326 struct vnode *a_vp; 327 struct vattr *a_vap; 328 kauth_cred_t a_cred; 329 struct lwp *a_l; 330 } */ *ap = v; 331 struct vattr *vap = ap->a_vap; 332 struct vnode *vp = ap->a_vp; 333 struct inode *ip = VTOI(vp); 334 kauth_cred_t cred = ap->a_cred; 335 struct lwp *l = ap->a_l; 336 int error; 337 338 /* 339 * Check for unsettable attributes. 340 */ 341 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 342 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 343 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 344 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 345 return (EINVAL); 346 } 347 if (vap->va_flags != VNOVAL) { 348 if (vp->v_mount->mnt_flag & MNT_RDONLY) 349 return (EROFS); 350 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 351 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 352 &l->l_proc->p_acflag))) 353 return (error); 354 #ifdef EXT2FS_SYSTEM_FLAGS 355 if (kauth_cred_geteuid(cred) == 0) { 356 if ((ip->i_e2fs_flags & 357 (EXT2_APPEND | EXT2_IMMUTABLE)) && securelevel > 0) 358 return (EPERM); 359 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 360 ip->i_e2fs_flags |= 361 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 362 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 363 } else 364 return (EPERM); 365 #else 366 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 367 ip->i_e2fs_flags |= 368 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 369 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 370 #endif 371 ip->i_flag |= IN_CHANGE; 372 if (vap->va_flags & (IMMUTABLE | APPEND)) 373 return (0); 374 } 375 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 376 return (EPERM); 377 /* 378 * Go through the fields and update iff not VNOVAL. 379 */ 380 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 381 if (vp->v_mount->mnt_flag & MNT_RDONLY) 382 return (EROFS); 383 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l->l_proc); 384 if (error) 385 return (error); 386 } 387 if (vap->va_size != VNOVAL) { 388 /* 389 * Disallow write attempts on read-only file systems; 390 * unless the file is a socket, fifo, or a block or 391 * character device resident on the file system. 392 */ 393 switch (vp->v_type) { 394 case VDIR: 395 return (EISDIR); 396 case VLNK: 397 case VREG: 398 if (vp->v_mount->mnt_flag & MNT_RDONLY) 399 return (EROFS); 400 default: 401 break; 402 } 403 error = ext2fs_truncate(vp, vap->va_size, 0, cred, l->l_proc); 404 if (error) 405 return (error); 406 } 407 ip = VTOI(vp); 408 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 409 if (vp->v_mount->mnt_flag & MNT_RDONLY) 410 return (EROFS); 411 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 412 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 413 &l->l_proc->p_acflag)) && 414 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 415 (error = VOP_ACCESS(vp, VWRITE, cred, l)))) 416 return (error); 417 if (vap->va_atime.tv_sec != VNOVAL) 418 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 419 ip->i_flag |= IN_ACCESS; 420 if (vap->va_mtime.tv_sec != VNOVAL) 421 ip->i_flag |= IN_CHANGE | IN_UPDATE; 422 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 423 UPDATE_WAIT); 424 if (error) 425 return (error); 426 } 427 error = 0; 428 if (vap->va_mode != (mode_t)VNOVAL) { 429 if (vp->v_mount->mnt_flag & MNT_RDONLY) 430 return (EROFS); 431 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l->l_proc); 432 } 433 VN_KNOTE(vp, NOTE_ATTRIB); 434 return (error); 435 } 436 437 /* 438 * Change the mode on a file. 439 * Inode must be locked before calling. 440 */ 441 static int 442 ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct proc *p) 443 { 444 struct inode *ip = VTOI(vp); 445 int error, ismember = 0; 446 447 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 448 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 449 &p->p_acflag))) 450 return (error); 451 if (kauth_cred_geteuid(cred)) { 452 if (vp->v_type != VDIR && (mode & S_ISTXT)) 453 return (EFTYPE); 454 if ((kauth_cred_ismember_gid(cred, ip->i_e2fs_gid, &ismember) != 0 || 455 !ismember) && (mode & ISGID)) 456 return (EPERM); 457 } 458 ip->i_e2fs_mode &= ~ALLPERMS; 459 ip->i_e2fs_mode |= (mode & ALLPERMS); 460 ip->i_flag |= IN_CHANGE; 461 return (0); 462 } 463 464 /* 465 * Perform chown operation on inode ip; 466 * inode must be locked prior to call. 467 */ 468 static int 469 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 470 struct proc *p) 471 { 472 struct inode *ip = VTOI(vp); 473 uid_t ouid; 474 gid_t ogid; 475 int error = 0, ismember = 0; 476 477 if (uid == (uid_t)VNOVAL) 478 uid = ip->i_e2fs_uid; 479 if (gid == (gid_t)VNOVAL) 480 gid = ip->i_e2fs_gid; 481 /* 482 * If we don't own the file, are trying to change the owner 483 * of the file, or are not a member of the target group, 484 * the caller must be superuser or the call fails. 485 */ 486 if ((kauth_cred_geteuid(cred) != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 487 (gid != ip->i_e2fs_gid && 488 !(kauth_cred_getegid(cred) == gid || 489 (kauth_cred_ismember_gid(cred, gid, &ismember) == 0 && ismember)))) && 490 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 491 &p->p_acflag))) 492 return (error); 493 ogid = ip->i_e2fs_gid; 494 ouid = ip->i_e2fs_uid; 495 496 ip->i_e2fs_gid = gid; 497 ip->i_e2fs_uid = uid; 498 if (ouid != uid || ogid != gid) 499 ip->i_flag |= IN_CHANGE; 500 if (ouid != uid && kauth_cred_geteuid(cred) != 0) 501 ip->i_e2fs_mode &= ~ISUID; 502 if (ogid != gid && kauth_cred_geteuid(cred) != 0) 503 ip->i_e2fs_mode &= ~ISGID; 504 return (0); 505 } 506 507 int 508 ext2fs_remove(void *v) 509 { 510 struct vop_remove_args /* { 511 struct vnode *a_dvp; 512 struct vnode *a_vp; 513 struct componentname *a_cnp; 514 } */ *ap = v; 515 struct inode *ip; 516 struct vnode *vp = ap->a_vp; 517 struct vnode *dvp = ap->a_dvp; 518 int error; 519 520 ip = VTOI(vp); 521 if (vp->v_type == VDIR || 522 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 523 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 524 error = EPERM; 525 } else { 526 error = ext2fs_dirremove(dvp, ap->a_cnp); 527 if (error == 0) { 528 ip->i_e2fs_nlink--; 529 ip->i_flag |= IN_CHANGE; 530 } 531 } 532 533 VN_KNOTE(vp, NOTE_DELETE); 534 VN_KNOTE(dvp, NOTE_WRITE); 535 if (dvp == vp) 536 vrele(vp); 537 else 538 vput(vp); 539 vput(dvp); 540 return (error); 541 } 542 543 /* 544 * link vnode call 545 */ 546 int 547 ext2fs_link(void *v) 548 { 549 struct vop_link_args /* { 550 struct vnode *a_dvp; 551 struct vnode *a_vp; 552 struct componentname *a_cnp; 553 } */ *ap = v; 554 struct vnode *dvp = ap->a_dvp; 555 struct vnode *vp = ap->a_vp; 556 struct componentname *cnp = ap->a_cnp; 557 struct inode *ip; 558 int error; 559 560 #ifdef DIAGNOSTIC 561 if ((cnp->cn_flags & HASBUF) == 0) 562 panic("ext2fs_link: no name"); 563 #endif 564 if (vp->v_type == VDIR) { 565 VOP_ABORTOP(dvp, cnp); 566 error = EISDIR; 567 goto out2; 568 } 569 if (dvp->v_mount != vp->v_mount) { 570 VOP_ABORTOP(dvp, cnp); 571 error = EXDEV; 572 goto out2; 573 } 574 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 575 VOP_ABORTOP(dvp, cnp); 576 goto out2; 577 } 578 ip = VTOI(vp); 579 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 580 VOP_ABORTOP(dvp, cnp); 581 error = EMLINK; 582 goto out1; 583 } 584 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 585 VOP_ABORTOP(dvp, cnp); 586 error = EPERM; 587 goto out1; 588 } 589 ip->i_e2fs_nlink++; 590 ip->i_flag |= IN_CHANGE; 591 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 592 if (!error) 593 error = ext2fs_direnter(ip, dvp, cnp); 594 if (error) { 595 ip->i_e2fs_nlink--; 596 ip->i_flag |= IN_CHANGE; 597 } 598 PNBUF_PUT(cnp->cn_pnbuf); 599 out1: 600 if (dvp != vp) 601 VOP_UNLOCK(vp, 0); 602 out2: 603 VN_KNOTE(vp, NOTE_LINK); 604 VN_KNOTE(dvp, NOTE_WRITE); 605 vput(dvp); 606 return (error); 607 } 608 609 /* 610 * Rename system call. 611 * rename("foo", "bar"); 612 * is essentially 613 * unlink("bar"); 614 * link("foo", "bar"); 615 * unlink("foo"); 616 * but ``atomically''. Can't do full commit without saving state in the 617 * inode on disk which isn't feasible at this time. Best we can do is 618 * always guarantee the target exists. 619 * 620 * Basic algorithm is: 621 * 622 * 1) Bump link count on source while we're linking it to the 623 * target. This also ensure the inode won't be deleted out 624 * from underneath us while we work (it may be truncated by 625 * a concurrent `trunc' or `open' for creation). 626 * 2) Link source to destination. If destination already exists, 627 * delete it first. 628 * 3) Unlink source reference to inode if still around. If a 629 * directory was moved and the parent of the destination 630 * is different from the source, patch the ".." entry in the 631 * directory. 632 */ 633 int 634 ext2fs_rename(void *v) 635 { 636 struct vop_rename_args /* { 637 struct vnode *a_fdvp; 638 struct vnode *a_fvp; 639 struct componentname *a_fcnp; 640 struct vnode *a_tdvp; 641 struct vnode *a_tvp; 642 struct componentname *a_tcnp; 643 } */ *ap = v; 644 struct vnode *tvp = ap->a_tvp; 645 struct vnode *tdvp = ap->a_tdvp; 646 struct vnode *fvp = ap->a_fvp; 647 struct vnode *fdvp = ap->a_fdvp; 648 struct componentname *tcnp = ap->a_tcnp; 649 struct componentname *fcnp = ap->a_fcnp; 650 struct inode *ip, *xp, *dp; 651 struct ext2fs_dirtemplate dirbuf; 652 int doingdirectory = 0, oldparent = 0, newparent = 0; 653 int error = 0; 654 u_char namlen; 655 656 #ifdef DIAGNOSTIC 657 if ((tcnp->cn_flags & HASBUF) == 0 || 658 (fcnp->cn_flags & HASBUF) == 0) 659 panic("ext2fs_rename: no name"); 660 #endif 661 /* 662 * Check for cross-device rename. 663 */ 664 if ((fvp->v_mount != tdvp->v_mount) || 665 (tvp && (fvp->v_mount != tvp->v_mount))) { 666 error = EXDEV; 667 abortit: 668 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 669 if (tdvp == tvp) 670 vrele(tdvp); 671 else 672 vput(tdvp); 673 if (tvp) 674 vput(tvp); 675 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 676 vrele(fdvp); 677 vrele(fvp); 678 return (error); 679 } 680 681 /* 682 * Check if just deleting a link name. 683 */ 684 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 685 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 686 error = EPERM; 687 goto abortit; 688 } 689 if (fvp == tvp) { 690 if (fvp->v_type == VDIR) { 691 error = EINVAL; 692 goto abortit; 693 } 694 695 /* Release destination completely. */ 696 VOP_ABORTOP(tdvp, tcnp); 697 vput(tdvp); 698 vput(tvp); 699 700 /* Delete source. */ 701 vrele(fdvp); 702 vrele(fvp); 703 fcnp->cn_flags &= ~MODMASK; 704 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 705 if ((fcnp->cn_flags & SAVESTART) == 0) 706 panic("ext2fs_rename: lost from startdir"); 707 fcnp->cn_nameiop = DELETE; 708 (void) relookup(fdvp, &fvp, fcnp); 709 return (VOP_REMOVE(fdvp, fvp, fcnp)); 710 } 711 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 712 goto abortit; 713 dp = VTOI(fdvp); 714 ip = VTOI(fvp); 715 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 716 VOP_UNLOCK(fvp, 0); 717 error = EMLINK; 718 goto abortit; 719 } 720 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 721 (dp->i_e2fs_flags & EXT2_APPEND)) { 722 VOP_UNLOCK(fvp, 0); 723 error = EPERM; 724 goto abortit; 725 } 726 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 727 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 728 if (!error && tvp) 729 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, 730 tcnp->cn_lwp); 731 if (error) { 732 VOP_UNLOCK(fvp, 0); 733 error = EACCES; 734 goto abortit; 735 } 736 /* 737 * Avoid ".", "..", and aliases of "." for obvious reasons. 738 */ 739 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 740 dp == ip || 741 (fcnp->cn_flags&ISDOTDOT) || 742 (tcnp->cn_flags & ISDOTDOT) || 743 (ip->i_flag & IN_RENAME)) { 744 VOP_UNLOCK(fvp, 0); 745 error = EINVAL; 746 goto abortit; 747 } 748 ip->i_flag |= IN_RENAME; 749 oldparent = dp->i_number; 750 doingdirectory++; 751 } 752 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 753 vrele(fdvp); 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, 0); 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, tcnp->cn_lwp); 788 VOP_UNLOCK(fvp, 0); 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 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 797 if (error != 0) 798 goto out; 799 if ((tcnp->cn_flags & SAVESTART) == 0) 800 panic("ext2fs_rename: lost to startdir"); 801 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 802 goto out; 803 dp = VTOI(tdvp); 804 xp = NULL; 805 if (tvp) 806 xp = VTOI(tvp); 807 } 808 /* 809 * 2) If target doesn't exist, link the target 810 * to the source and unlink the source. 811 * Otherwise, rewrite the target directory 812 * entry to reference the source inode and 813 * expunge the original entry's existence. 814 */ 815 if (xp == NULL) { 816 if (dp->i_dev != ip->i_dev) 817 panic("rename: EXDEV"); 818 /* 819 * Account for ".." in new directory. 820 * When source and destination have the same 821 * parent we don't fool with the link count. 822 */ 823 if (doingdirectory && newparent) { 824 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 825 error = EMLINK; 826 goto bad; 827 } 828 dp->i_e2fs_nlink++; 829 dp->i_flag |= IN_CHANGE; 830 if ((error = ext2fs_update(tdvp, NULL, NULL, 831 UPDATE_WAIT)) != 0) 832 goto bad; 833 } 834 error = ext2fs_direnter(ip, tdvp, tcnp); 835 if (error != 0) { 836 if (doingdirectory && newparent) { 837 dp->i_e2fs_nlink--; 838 dp->i_flag |= IN_CHANGE; 839 (void)ext2fs_update(tdvp, NULL, NULL, 840 UPDATE_WAIT); 841 } 842 goto bad; 843 } 844 VN_KNOTE(tdvp, NOTE_WRITE); 845 vput(tdvp); 846 } else { 847 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 848 panic("rename: EXDEV"); 849 /* 850 * Short circuit rename(foo, foo). 851 */ 852 if (xp->i_number == ip->i_number) 853 panic("rename: same file"); 854 /* 855 * If the parent directory is "sticky", then the user must 856 * own the parent directory, or the destination of the rename, 857 * otherwise the destination may not be changed (except by 858 * root). This implements append-only directories. 859 */ 860 if ((dp->i_e2fs_mode & S_ISTXT) && kauth_cred_geteuid(tcnp->cn_cred) != 0 && 861 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_e2fs_uid && 862 xp->i_e2fs_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 863 error = EPERM; 864 goto bad; 865 } 866 /* 867 * Target must be empty if a directory and have no links 868 * to it. Also, ensure source and target are compatible 869 * (both directories, or both not directories). 870 */ 871 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 872 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 873 xp->i_e2fs_nlink > 2) { 874 error = ENOTEMPTY; 875 goto bad; 876 } 877 if (!doingdirectory) { 878 error = ENOTDIR; 879 goto bad; 880 } 881 cache_purge(tdvp); 882 } else if (doingdirectory) { 883 error = EISDIR; 884 goto bad; 885 } 886 error = ext2fs_dirrewrite(dp, ip, tcnp); 887 if (error != 0) 888 goto bad; 889 /* 890 * If the target directory is in the same 891 * directory as the source directory, 892 * decrement the link count on the parent 893 * of the target directory. 894 */ 895 if (doingdirectory && !newparent) { 896 dp->i_e2fs_nlink--; 897 dp->i_flag |= IN_CHANGE; 898 } 899 VN_KNOTE(tdvp, NOTE_WRITE); 900 vput(tdvp); 901 /* 902 * Adjust the link count of the target to 903 * reflect the dirrewrite above. If this is 904 * a directory it is empty and there are 905 * no links to it, so we can squash the inode and 906 * any space associated with it. We disallowed 907 * renaming over top of a directory with links to 908 * it above, as the remaining link would point to 909 * a directory without "." or ".." entries. 910 */ 911 xp->i_e2fs_nlink--; 912 if (doingdirectory) { 913 if (--xp->i_e2fs_nlink != 0) 914 panic("rename: linked directory"); 915 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 916 tcnp->cn_cred, tcnp->cn_lwp->l_proc); 917 } 918 xp->i_flag |= IN_CHANGE; 919 VN_KNOTE(tvp, NOTE_DELETE); 920 vput(tvp); 921 xp = NULL; 922 } 923 924 /* 925 * 3) Unlink the source. 926 */ 927 fcnp->cn_flags &= ~MODMASK; 928 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 929 if ((fcnp->cn_flags & SAVESTART) == 0) 930 panic("ext2fs_rename: lost from startdir"); 931 (void) relookup(fdvp, &fvp, fcnp); 932 if (fvp != NULL) { 933 xp = VTOI(fvp); 934 dp = VTOI(fdvp); 935 } else { 936 /* 937 * From name has disappeared. 938 */ 939 if (doingdirectory) 940 panic("ext2fs_rename: lost dir entry"); 941 vrele(ap->a_fvp); 942 return (0); 943 } 944 /* 945 * Ensure that the directory entry still exists and has not 946 * changed while the new name has been entered. If the source is 947 * a file then the entry may have been unlinked or renamed. In 948 * either case there is no further work to be done. If the source 949 * is a directory then it cannot have been rmdir'ed; its link 950 * count of three would cause a rmdir to fail with ENOTEMPTY. 951 * The IRENAME flag ensures that it cannot be moved by another 952 * rename. 953 */ 954 if (xp != ip) { 955 if (doingdirectory) 956 panic("ext2fs_rename: lost dir entry"); 957 } else { 958 /* 959 * If the source is a directory with a 960 * new parent, the link count of the old 961 * parent directory must be decremented 962 * and ".." set to point to the new parent. 963 */ 964 if (doingdirectory && newparent) { 965 dp->i_e2fs_nlink--; 966 dp->i_flag |= IN_CHANGE; 967 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 968 sizeof (struct ext2fs_dirtemplate), (off_t)0, 969 UIO_SYSSPACE, IO_NODELOCKED, 970 tcnp->cn_cred, (size_t *)0, NULL); 971 if (error == 0) { 972 namlen = dirbuf.dotdot_namlen; 973 if (namlen != 2 || 974 dirbuf.dotdot_name[0] != '.' || 975 dirbuf.dotdot_name[1] != '.') { 976 ufs_dirbad(xp, (doff_t)12, 977 "ext2fs_rename: mangled dir"); 978 } else { 979 dirbuf.dotdot_ino = h2fs32(newparent); 980 (void) vn_rdwr(UIO_WRITE, fvp, 981 (caddr_t)&dirbuf, 982 sizeof (struct dirtemplate), 983 (off_t)0, UIO_SYSSPACE, 984 IO_NODELOCKED|IO_SYNC, 985 tcnp->cn_cred, (size_t *)0, 986 NULL); 987 cache_purge(fdvp); 988 } 989 } 990 } 991 error = ext2fs_dirremove(fdvp, fcnp); 992 if (!error) { 993 xp->i_e2fs_nlink--; 994 xp->i_flag |= IN_CHANGE; 995 } 996 xp->i_flag &= ~IN_RENAME; 997 } 998 VN_KNOTE(fvp, NOTE_RENAME); 999 if (dp) 1000 vput(fdvp); 1001 if (xp) 1002 vput(fvp); 1003 vrele(ap->a_fvp); 1004 return (error); 1005 1006 bad: 1007 if (xp) 1008 vput(ITOV(xp)); 1009 vput(ITOV(dp)); 1010 out: 1011 if (doingdirectory) 1012 ip->i_flag &= ~IN_RENAME; 1013 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1014 ip->i_e2fs_nlink--; 1015 ip->i_flag |= IN_CHANGE; 1016 vput(fvp); 1017 } else 1018 vrele(fvp); 1019 return (error); 1020 } 1021 1022 /* 1023 * Mkdir system call 1024 */ 1025 int 1026 ext2fs_mkdir(void *v) 1027 { 1028 struct vop_mkdir_args /* { 1029 struct vnode *a_dvp; 1030 struct vnode **a_vpp; 1031 struct componentname *a_cnp; 1032 struct vattr *a_vap; 1033 } */ *ap = v; 1034 struct vnode *dvp = ap->a_dvp; 1035 struct vattr *vap = ap->a_vap; 1036 struct componentname *cnp = ap->a_cnp; 1037 struct inode *ip, *dp = VTOI(dvp); 1038 struct vnode *tvp; 1039 struct ext2fs_dirtemplate dirtemplate; 1040 int error, dmode; 1041 1042 #ifdef DIAGNOSTIC 1043 if ((cnp->cn_flags & HASBUF) == 0) 1044 panic("ext2fs_mkdir: no name"); 1045 #endif 1046 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1047 error = EMLINK; 1048 goto out; 1049 } 1050 dmode = vap->va_mode & ACCESSPERMS; 1051 dmode |= IFDIR; 1052 /* 1053 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1054 * but not have it entered in the parent directory. The entry is 1055 * made later after writing "." and ".." entries. 1056 */ 1057 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1058 goto out; 1059 ip = VTOI(tvp); 1060 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1061 ip->i_e2fs_gid = dp->i_e2fs_gid; 1062 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1063 ip->i_e2fs_mode = dmode; 1064 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1065 ip->i_e2fs_nlink = 2; 1066 1067 /* 1068 * Bump link count in parent directory 1069 * to reflect work done below. Should 1070 * be done before reference is created 1071 * so reparation is possible if we crash. 1072 */ 1073 dp->i_e2fs_nlink++; 1074 dp->i_flag |= IN_CHANGE; 1075 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1076 goto bad; 1077 1078 /* Initialize directory with "." and ".." from static template. */ 1079 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1080 dirtemplate.dot_ino = h2fs32(ip->i_number); 1081 dirtemplate.dot_reclen = h2fs16(12); 1082 dirtemplate.dot_namlen = 1; 1083 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1084 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1085 dirtemplate.dot_type = EXT2_FT_DIR; 1086 } 1087 dirtemplate.dot_name[0] = '.'; 1088 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1089 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1090 dirtemplate.dotdot_namlen = 2; 1091 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1092 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1093 dirtemplate.dotdot_type = EXT2_FT_DIR; 1094 } 1095 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1096 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1097 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1098 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1099 if (error) { 1100 dp->i_e2fs_nlink--; 1101 dp->i_flag |= IN_CHANGE; 1102 goto bad; 1103 } 1104 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1105 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1106 else { 1107 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1108 if (error) { 1109 dp->i_e2fs_nlink--; 1110 dp->i_flag |= IN_CHANGE; 1111 goto bad; 1112 } 1113 ip->i_flag |= IN_CHANGE; 1114 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1115 } 1116 1117 /* Directory set up, now install it's entry in the parent directory. */ 1118 error = ext2fs_direnter(ip, dvp, cnp); 1119 if (error != 0) { 1120 dp->i_e2fs_nlink--; 1121 dp->i_flag |= IN_CHANGE; 1122 } 1123 bad: 1124 /* 1125 * No need to do an explicit ext2fs_truncate here, vrele will do this 1126 * for us because we set the link count to 0. 1127 */ 1128 if (error) { 1129 ip->i_e2fs_nlink = 0; 1130 ip->i_flag |= IN_CHANGE; 1131 vput(tvp); 1132 } else { 1133 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1134 *ap->a_vpp = tvp; 1135 } 1136 out: 1137 PNBUF_PUT(cnp->cn_pnbuf); 1138 vput(dvp); 1139 return (error); 1140 } 1141 1142 /* 1143 * Rmdir system call. 1144 */ 1145 int 1146 ext2fs_rmdir(void *v) 1147 { 1148 struct vop_rmdir_args /* { 1149 struct vnode *a_dvp; 1150 struct vnode *a_vp; 1151 struct componentname *a_cnp; 1152 } */ *ap = v; 1153 struct vnode *vp = ap->a_vp; 1154 struct vnode *dvp = ap->a_dvp; 1155 struct componentname *cnp = ap->a_cnp; 1156 struct inode *ip, *dp; 1157 int error; 1158 1159 ip = VTOI(vp); 1160 dp = VTOI(dvp); 1161 /* 1162 * No rmdir "." please. 1163 */ 1164 if (dp == ip) { 1165 vrele(dvp); 1166 vput(vp); 1167 return (EINVAL); 1168 } 1169 /* 1170 * Verify the directory is empty (and valid). 1171 * (Rmdir ".." won't be valid since 1172 * ".." will contain a reference to 1173 * the current directory and thus be 1174 * non-empty.) 1175 */ 1176 error = 0; 1177 if (ip->i_e2fs_nlink != 2 || 1178 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1179 error = ENOTEMPTY; 1180 goto out; 1181 } 1182 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1183 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1184 error = EPERM; 1185 goto out; 1186 } 1187 /* 1188 * Delete reference to directory before purging 1189 * inode. If we crash in between, the directory 1190 * will be reattached to lost+found, 1191 */ 1192 error = ext2fs_dirremove(dvp, cnp); 1193 if (error != 0) 1194 goto out; 1195 dp->i_e2fs_nlink--; 1196 dp->i_flag |= IN_CHANGE; 1197 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1198 cache_purge(dvp); 1199 vput(dvp); 1200 dvp = NULL; 1201 /* 1202 * Truncate inode. The only stuff left 1203 * in the directory is "." and "..". The 1204 * "." reference is inconsequential since 1205 * we're quashing it. The ".." reference 1206 * has already been adjusted above. We've 1207 * removed the "." reference and the reference 1208 * in the parent directory, but there may be 1209 * other hard links so decrement by 2 and 1210 * worry about them later. 1211 */ 1212 ip->i_e2fs_nlink -= 2; 1213 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1214 cnp->cn_lwp->l_proc); 1215 cache_purge(ITOV(ip)); 1216 out: 1217 VN_KNOTE(vp, NOTE_DELETE); 1218 if (dvp) 1219 vput(dvp); 1220 vput(vp); 1221 return (error); 1222 } 1223 1224 /* 1225 * symlink -- make a symbolic link 1226 */ 1227 int 1228 ext2fs_symlink(void *v) 1229 { 1230 struct vop_symlink_args /* { 1231 struct vnode *a_dvp; 1232 struct vnode **a_vpp; 1233 struct componentname *a_cnp; 1234 struct vattr *a_vap; 1235 char *a_target; 1236 } */ *ap = v; 1237 struct vnode *vp, **vpp; 1238 struct inode *ip; 1239 int len, error; 1240 1241 vpp = ap->a_vpp; 1242 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1243 vpp, ap->a_cnp); 1244 if (error) 1245 return (error); 1246 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1247 vp = *vpp; 1248 len = strlen(ap->a_target); 1249 ip = VTOI(vp); 1250 if (len < ip->i_ump->um_maxsymlinklen) { 1251 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1252 error = ext2fs_setsize(ip, len); 1253 if (error) 1254 goto bad; 1255 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1256 uvm_vnp_setsize(vp, len); 1257 } else 1258 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1259 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1260 (size_t *)0, NULL); 1261 bad: 1262 if (error) 1263 vput(vp); 1264 return (error); 1265 } 1266 1267 /* 1268 * Return target name of a symbolic link 1269 */ 1270 int 1271 ext2fs_readlink(void *v) 1272 { 1273 struct vop_readlink_args /* { 1274 struct vnode *a_vp; 1275 struct uio *a_uio; 1276 kauth_cred_t a_cred; 1277 } */ *ap = v; 1278 struct vnode *vp = ap->a_vp; 1279 struct inode *ip = VTOI(vp); 1280 struct ufsmount *ump = ip->i_ump; 1281 int isize; 1282 1283 isize = ext2fs_size(ip); 1284 if (isize < ump->um_maxsymlinklen || 1285 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1286 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1287 return (0); 1288 } 1289 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1290 } 1291 1292 /* 1293 * Advisory record locking support 1294 */ 1295 int 1296 ext2fs_advlock(void *v) 1297 { 1298 struct vop_advlock_args /* { 1299 struct vnode *a_vp; 1300 caddr_t a_id; 1301 int a_op; 1302 struct flock *a_fl; 1303 int a_flags; 1304 } */ *ap = v; 1305 struct inode *ip = VTOI(ap->a_vp); 1306 1307 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1308 } 1309 1310 int 1311 ext2fs_fsync(void *v) 1312 { 1313 struct vop_fsync_args /* { 1314 struct vnode *a_vp; 1315 kauth_cred_t a_cred; 1316 int a_flags; 1317 off_t offlo; 1318 off_t offhi; 1319 struct proc *a_p; 1320 } */ *ap = v; 1321 struct vnode *vp = ap->a_vp; 1322 int wait; 1323 int error; 1324 1325 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1326 vflushbuf(vp, wait); 1327 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1328 error = 0; 1329 else 1330 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1331 1332 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1333 int l = 0; 1334 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1335 ap->a_l->l_proc->p_cred, ap->a_l); 1336 } 1337 1338 return error; 1339 } 1340 1341 /* 1342 * Initialize the vnode associated with a new inode, handle aliased 1343 * vnodes. 1344 */ 1345 int 1346 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1347 int (**fifoops)(void *), struct vnode **vpp) 1348 { 1349 struct inode *ip; 1350 struct vnode *vp, *nvp; 1351 1352 vp = *vpp; 1353 ip = VTOI(vp); 1354 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1355 case VCHR: 1356 case VBLK: 1357 vp->v_op = specops; 1358 if ((nvp = checkalias(vp, 1359 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1360 /* 1361 * Discard unneeded vnode, but save its inode. 1362 */ 1363 nvp->v_data = vp->v_data; 1364 vp->v_data = NULL; 1365 VOP_UNLOCK(vp, 0); 1366 vp->v_op = spec_vnodeop_p; 1367 vp->v_flag &= ~VLOCKSWORK; 1368 vrele(vp); 1369 vgone(vp); 1370 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1371 /* 1372 * Reinitialize aliased inode. 1373 */ 1374 vp = nvp; 1375 ip->i_vnode = vp; 1376 } 1377 break; 1378 case VFIFO: 1379 vp->v_op = fifoops; 1380 break; 1381 case VNON: 1382 case VBAD: 1383 case VSOCK: 1384 case VLNK: 1385 case VDIR: 1386 case VREG: 1387 break; 1388 } 1389 if (ip->i_number == ROOTINO) 1390 vp->v_flag |= VROOT; 1391 /* 1392 * Initialize modrev times 1393 */ 1394 SETHIGH(ip->i_modrev, mono_time.tv_sec); 1395 SETLOW(ip->i_modrev, mono_time.tv_usec * 4294); 1396 *vpp = vp; 1397 return (0); 1398 } 1399 1400 /* 1401 * Allocate a new inode. 1402 */ 1403 int 1404 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1405 struct componentname *cnp) 1406 { 1407 struct inode *ip, *pdir; 1408 struct vnode *tvp; 1409 int error, ismember = 0; 1410 1411 pdir = VTOI(dvp); 1412 #ifdef DIAGNOSTIC 1413 if ((cnp->cn_flags & HASBUF) == 0) 1414 panic("ext2fs_makeinode: no name"); 1415 #endif 1416 *vpp = NULL; 1417 if ((mode & IFMT) == 0) 1418 mode |= IFREG; 1419 1420 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1421 PNBUF_PUT(cnp->cn_pnbuf); 1422 vput(dvp); 1423 return (error); 1424 } 1425 ip = VTOI(tvp); 1426 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1427 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1428 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1429 ip->i_e2fs_mode = mode; 1430 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1431 ip->i_e2fs_nlink = 1; 1432 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1433 ip->i_e2fs_gid, &ismember) != 0 || !ismember) && 1434 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1435 ip->i_e2fs_mode &= ~ISGID; 1436 1437 /* 1438 * Make sure inode goes to disk before directory entry. 1439 */ 1440 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1441 goto bad; 1442 error = ext2fs_direnter(ip, dvp, cnp); 1443 if (error != 0) 1444 goto bad; 1445 if ((cnp->cn_flags & SAVESTART) == 0) 1446 PNBUF_PUT(cnp->cn_pnbuf); 1447 vput(dvp); 1448 *vpp = tvp; 1449 return (0); 1450 1451 bad: 1452 /* 1453 * Write error occurred trying to update the inode 1454 * or the directory so must deallocate the inode. 1455 */ 1456 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1457 ip->i_e2fs_nlink = 0; 1458 ip->i_flag |= IN_CHANGE; 1459 vput(tvp); 1460 PNBUF_PUT(cnp->cn_pnbuf); 1461 vput(dvp); 1462 return (error); 1463 } 1464 1465 /* 1466 * Reclaim an inode so that it can be used for other purposes. 1467 */ 1468 int 1469 ext2fs_reclaim(void *v) 1470 { 1471 struct vop_reclaim_args /* { 1472 struct vnode *a_vp; 1473 } */ *ap = v; 1474 struct vnode *vp = ap->a_vp; 1475 struct inode *ip = VTOI(vp); 1476 int error; 1477 1478 if ((error = ufs_reclaim(vp, ap->a_l)) != 0) 1479 return (error); 1480 if (ip->i_din.e2fs_din != NULL) 1481 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1482 pool_put(&ext2fs_inode_pool, vp->v_data); 1483 vp->v_data = NULL; 1484 return (0); 1485 } 1486 1487 /* Global vfs data structures for ext2fs. */ 1488 int (**ext2fs_vnodeop_p)(void *); 1489 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1490 { &vop_default_desc, vn_default_error }, 1491 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1492 { &vop_create_desc, ext2fs_create }, /* create */ 1493 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1494 { &vop_open_desc, ext2fs_open }, /* open */ 1495 { &vop_close_desc, ufs_close }, /* close */ 1496 { &vop_access_desc, ext2fs_access }, /* access */ 1497 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1498 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1499 { &vop_read_desc, ext2fs_read }, /* read */ 1500 { &vop_write_desc, ext2fs_write }, /* write */ 1501 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1502 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1503 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1504 { &vop_poll_desc, ufs_poll }, /* poll */ 1505 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1506 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1507 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1508 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1509 { &vop_seek_desc, ufs_seek }, /* seek */ 1510 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1511 { &vop_link_desc, ext2fs_link }, /* link */ 1512 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1513 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1514 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1515 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1516 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1517 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1518 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1519 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1520 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1521 { &vop_lock_desc, ufs_lock }, /* lock */ 1522 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1523 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1524 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1525 { &vop_print_desc, ufs_print }, /* print */ 1526 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1527 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1528 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1529 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1530 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1531 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1532 { NULL, NULL } 1533 }; 1534 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1535 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1536 1537 int (**ext2fs_specop_p)(void *); 1538 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1539 { &vop_default_desc, vn_default_error }, 1540 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1541 { &vop_create_desc, spec_create }, /* create */ 1542 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1543 { &vop_open_desc, spec_open }, /* open */ 1544 { &vop_close_desc, ufsspec_close }, /* close */ 1545 { &vop_access_desc, ext2fs_access }, /* access */ 1546 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1547 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1548 { &vop_read_desc, ufsspec_read }, /* read */ 1549 { &vop_write_desc, ufsspec_write }, /* write */ 1550 { &vop_lease_desc, spec_lease_check }, /* lease */ 1551 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1552 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1553 { &vop_poll_desc, spec_poll }, /* poll */ 1554 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1555 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1556 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1557 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1558 { &vop_seek_desc, spec_seek }, /* seek */ 1559 { &vop_remove_desc, spec_remove }, /* remove */ 1560 { &vop_link_desc, spec_link }, /* link */ 1561 { &vop_rename_desc, spec_rename }, /* rename */ 1562 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1563 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1564 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1565 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1566 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1567 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1568 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1569 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1570 { &vop_lock_desc, ufs_lock }, /* lock */ 1571 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1572 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1573 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1574 { &vop_print_desc, ufs_print }, /* print */ 1575 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1576 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1577 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1578 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1579 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1580 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1581 { NULL, NULL } 1582 }; 1583 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1584 { &ext2fs_specop_p, ext2fs_specop_entries }; 1585 1586 int (**ext2fs_fifoop_p)(void *); 1587 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1588 { &vop_default_desc, vn_default_error }, 1589 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1590 { &vop_create_desc, fifo_create }, /* create */ 1591 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1592 { &vop_open_desc, fifo_open }, /* open */ 1593 { &vop_close_desc, ufsfifo_close }, /* close */ 1594 { &vop_access_desc, ext2fs_access }, /* access */ 1595 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1596 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1597 { &vop_read_desc, ufsfifo_read }, /* read */ 1598 { &vop_write_desc, ufsfifo_write }, /* write */ 1599 { &vop_lease_desc, fifo_lease_check }, /* lease */ 1600 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1601 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1602 { &vop_poll_desc, fifo_poll }, /* poll */ 1603 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1604 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1605 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1606 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1607 { &vop_seek_desc, fifo_seek }, /* seek */ 1608 { &vop_remove_desc, fifo_remove }, /* remove */ 1609 { &vop_link_desc, fifo_link }, /* link */ 1610 { &vop_rename_desc, fifo_rename }, /* rename */ 1611 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1612 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1613 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1614 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1615 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1616 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1617 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1618 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1619 { &vop_lock_desc, ufs_lock }, /* lock */ 1620 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1621 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1622 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1623 { &vop_print_desc, ufs_print }, /* print */ 1624 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1625 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1626 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1627 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1628 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1629 { NULL, NULL } 1630 }; 1631 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1632 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1633
Indexes created Wed Oct 22 00:09:40 GMT 2025