ext2fs_vnops.c revision 1.64.10.3
1 /* $NetBSD: ext2fs_vnops.c,v 1.64.10.3 2006/03/11 04:55:29 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 1.64.10.3 2006/03/11 04:55:29 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; 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 error = kauth_cred_ismember_gid(cred, ip->i_e2fs_gid, &ismember); 455 if (error) 456 return (error); 457 if (!ismember && (mode & ISGID)) 458 return (EPERM); 459 } 460 ip->i_e2fs_mode &= ~ALLPERMS; 461 ip->i_e2fs_mode |= (mode & ALLPERMS); 462 ip->i_flag |= IN_CHANGE; 463 return (0); 464 } 465 466 /* 467 * Perform chown operation on inode ip; 468 * inode must be locked prior to call. 469 */ 470 static int 471 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 472 struct proc *p) 473 { 474 struct inode *ip = VTOI(vp); 475 uid_t ouid; 476 gid_t ogid; 477 int error = 0, ismember; 478 479 if (uid == (uid_t)VNOVAL) 480 uid = ip->i_e2fs_uid; 481 if (gid == (gid_t)VNOVAL) 482 gid = ip->i_e2fs_gid; 483 /* 484 * If we don't own the file, are trying to change the owner 485 * of the file, or are not a member of the target group, 486 * the caller must be superuser or the call fails. 487 */ 488 error = kauth_cred_ismember_gid(cred, gid, &ismember); 489 if (error) 490 return (error); 491 if ((kauth_cred_geteuid(cred) != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 492 (gid != ip->i_e2fs_gid && 493 !(kauth_cred_getegid(cred) == gid || ismember))) && 494 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 495 &p->p_acflag))) 496 return (error); 497 ogid = ip->i_e2fs_gid; 498 ouid = ip->i_e2fs_uid; 499 500 ip->i_e2fs_gid = gid; 501 ip->i_e2fs_uid = uid; 502 if (ouid != uid || ogid != gid) 503 ip->i_flag |= IN_CHANGE; 504 if (ouid != uid && kauth_cred_geteuid(cred) != 0) 505 ip->i_e2fs_mode &= ~ISUID; 506 if (ogid != gid && kauth_cred_geteuid(cred) != 0) 507 ip->i_e2fs_mode &= ~ISGID; 508 return (0); 509 } 510 511 int 512 ext2fs_remove(void *v) 513 { 514 struct vop_remove_args /* { 515 struct vnode *a_dvp; 516 struct vnode *a_vp; 517 struct componentname *a_cnp; 518 } */ *ap = v; 519 struct inode *ip; 520 struct vnode *vp = ap->a_vp; 521 struct vnode *dvp = ap->a_dvp; 522 int error; 523 524 ip = VTOI(vp); 525 if (vp->v_type == VDIR || 526 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 527 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 528 error = EPERM; 529 } else { 530 error = ext2fs_dirremove(dvp, ap->a_cnp); 531 if (error == 0) { 532 ip->i_e2fs_nlink--; 533 ip->i_flag |= IN_CHANGE; 534 } 535 } 536 537 VN_KNOTE(vp, NOTE_DELETE); 538 VN_KNOTE(dvp, NOTE_WRITE); 539 if (dvp == vp) 540 vrele(vp); 541 else 542 vput(vp); 543 vput(dvp); 544 return (error); 545 } 546 547 /* 548 * link vnode call 549 */ 550 int 551 ext2fs_link(void *v) 552 { 553 struct vop_link_args /* { 554 struct vnode *a_dvp; 555 struct vnode *a_vp; 556 struct componentname *a_cnp; 557 } */ *ap = v; 558 struct vnode *dvp = ap->a_dvp; 559 struct vnode *vp = ap->a_vp; 560 struct componentname *cnp = ap->a_cnp; 561 struct inode *ip; 562 int error; 563 564 #ifdef DIAGNOSTIC 565 if ((cnp->cn_flags & HASBUF) == 0) 566 panic("ext2fs_link: no name"); 567 #endif 568 if (vp->v_type == VDIR) { 569 VOP_ABORTOP(dvp, cnp); 570 error = EISDIR; 571 goto out2; 572 } 573 if (dvp->v_mount != vp->v_mount) { 574 VOP_ABORTOP(dvp, cnp); 575 error = EXDEV; 576 goto out2; 577 } 578 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 579 VOP_ABORTOP(dvp, cnp); 580 goto out2; 581 } 582 ip = VTOI(vp); 583 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 584 VOP_ABORTOP(dvp, cnp); 585 error = EMLINK; 586 goto out1; 587 } 588 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 589 VOP_ABORTOP(dvp, cnp); 590 error = EPERM; 591 goto out1; 592 } 593 ip->i_e2fs_nlink++; 594 ip->i_flag |= IN_CHANGE; 595 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 596 if (!error) 597 error = ext2fs_direnter(ip, dvp, cnp); 598 if (error) { 599 ip->i_e2fs_nlink--; 600 ip->i_flag |= IN_CHANGE; 601 } 602 PNBUF_PUT(cnp->cn_pnbuf); 603 out1: 604 if (dvp != vp) 605 VOP_UNLOCK(vp, 0); 606 out2: 607 VN_KNOTE(vp, NOTE_LINK); 608 VN_KNOTE(dvp, NOTE_WRITE); 609 vput(dvp); 610 return (error); 611 } 612 613 /* 614 * Rename system call. 615 * rename("foo", "bar"); 616 * is essentially 617 * unlink("bar"); 618 * link("foo", "bar"); 619 * unlink("foo"); 620 * but ``atomically''. Can't do full commit without saving state in the 621 * inode on disk which isn't feasible at this time. Best we can do is 622 * always guarantee the target exists. 623 * 624 * Basic algorithm is: 625 * 626 * 1) Bump link count on source while we're linking it to the 627 * target. This also ensure the inode won't be deleted out 628 * from underneath us while we work (it may be truncated by 629 * a concurrent `trunc' or `open' for creation). 630 * 2) Link source to destination. If destination already exists, 631 * delete it first. 632 * 3) Unlink source reference to inode if still around. If a 633 * directory was moved and the parent of the destination 634 * is different from the source, patch the ".." entry in the 635 * directory. 636 */ 637 int 638 ext2fs_rename(void *v) 639 { 640 struct vop_rename_args /* { 641 struct vnode *a_fdvp; 642 struct vnode *a_fvp; 643 struct componentname *a_fcnp; 644 struct vnode *a_tdvp; 645 struct vnode *a_tvp; 646 struct componentname *a_tcnp; 647 } */ *ap = v; 648 struct vnode *tvp = ap->a_tvp; 649 struct vnode *tdvp = ap->a_tdvp; 650 struct vnode *fvp = ap->a_fvp; 651 struct vnode *fdvp = ap->a_fdvp; 652 struct componentname *tcnp = ap->a_tcnp; 653 struct componentname *fcnp = ap->a_fcnp; 654 struct inode *ip, *xp, *dp; 655 struct ext2fs_dirtemplate dirbuf; 656 int doingdirectory = 0, oldparent = 0, newparent = 0; 657 int error = 0; 658 u_char namlen; 659 660 #ifdef DIAGNOSTIC 661 if ((tcnp->cn_flags & HASBUF) == 0 || 662 (fcnp->cn_flags & HASBUF) == 0) 663 panic("ext2fs_rename: no name"); 664 #endif 665 /* 666 * Check for cross-device rename. 667 */ 668 if ((fvp->v_mount != tdvp->v_mount) || 669 (tvp && (fvp->v_mount != tvp->v_mount))) { 670 error = EXDEV; 671 abortit: 672 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 673 if (tdvp == tvp) 674 vrele(tdvp); 675 else 676 vput(tdvp); 677 if (tvp) 678 vput(tvp); 679 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 680 vrele(fdvp); 681 vrele(fvp); 682 return (error); 683 } 684 685 /* 686 * Check if just deleting a link name. 687 */ 688 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 689 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 690 error = EPERM; 691 goto abortit; 692 } 693 if (fvp == tvp) { 694 if (fvp->v_type == VDIR) { 695 error = EINVAL; 696 goto abortit; 697 } 698 699 /* Release destination completely. */ 700 VOP_ABORTOP(tdvp, tcnp); 701 vput(tdvp); 702 vput(tvp); 703 704 /* Delete source. */ 705 vrele(fdvp); 706 vrele(fvp); 707 fcnp->cn_flags &= ~MODMASK; 708 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 709 if ((fcnp->cn_flags & SAVESTART) == 0) 710 panic("ext2fs_rename: lost from startdir"); 711 fcnp->cn_nameiop = DELETE; 712 (void) relookup(fdvp, &fvp, fcnp); 713 return (VOP_REMOVE(fdvp, fvp, fcnp)); 714 } 715 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 716 goto abortit; 717 dp = VTOI(fdvp); 718 ip = VTOI(fvp); 719 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 720 VOP_UNLOCK(fvp, 0); 721 error = EMLINK; 722 goto abortit; 723 } 724 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 725 (dp->i_e2fs_flags & EXT2_APPEND)) { 726 VOP_UNLOCK(fvp, 0); 727 error = EPERM; 728 goto abortit; 729 } 730 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 731 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 732 if (!error && tvp) 733 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, 734 tcnp->cn_lwp); 735 if (error) { 736 VOP_UNLOCK(fvp, 0); 737 error = EACCES; 738 goto abortit; 739 } 740 /* 741 * Avoid ".", "..", and aliases of "." for obvious reasons. 742 */ 743 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 744 dp == ip || 745 (fcnp->cn_flags&ISDOTDOT) || 746 (tcnp->cn_flags & ISDOTDOT) || 747 (ip->i_flag & IN_RENAME)) { 748 VOP_UNLOCK(fvp, 0); 749 error = EINVAL; 750 goto abortit; 751 } 752 ip->i_flag |= IN_RENAME; 753 oldparent = dp->i_number; 754 doingdirectory++; 755 } 756 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 757 vrele(fdvp); 758 759 /* 760 * When the target exists, both the directory 761 * and target vnodes are returned locked. 762 */ 763 dp = VTOI(tdvp); 764 xp = NULL; 765 if (tvp) 766 xp = VTOI(tvp); 767 768 /* 769 * 1) Bump link count while we're moving stuff 770 * around. If we crash somewhere before 771 * completing our work, the link count 772 * may be wrong, but correctable. 773 */ 774 ip->i_e2fs_nlink++; 775 ip->i_flag |= IN_CHANGE; 776 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 777 VOP_UNLOCK(fvp, 0); 778 goto bad; 779 } 780 781 /* 782 * If ".." must be changed (ie the directory gets a new 783 * parent) then the source directory must not be in the 784 * directory hierarchy above the target, as this would 785 * orphan everything below the source directory. Also 786 * the user must have write permission in the source so 787 * as to be able to change "..". We must repeat the call 788 * to namei, as the parent directory is unlocked by the 789 * call to checkpath(). 790 */ 791 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 792 VOP_UNLOCK(fvp, 0); 793 if (oldparent != dp->i_number) 794 newparent = dp->i_number; 795 if (doingdirectory && newparent) { 796 if (error) /* write access check above */ 797 goto bad; 798 if (xp != NULL) 799 vput(tvp); 800 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 801 if (error != 0) 802 goto out; 803 if ((tcnp->cn_flags & SAVESTART) == 0) 804 panic("ext2fs_rename: lost to startdir"); 805 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 806 goto out; 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) && kauth_cred_geteuid(tcnp->cn_cred) != 0 && 865 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_e2fs_uid && 866 xp->i_e2fs_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 867 error = EPERM; 868 goto bad; 869 } 870 /* 871 * Target must be empty if a directory and have no links 872 * to it. Also, ensure source and target are compatible 873 * (both directories, or both not directories). 874 */ 875 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 876 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 877 xp->i_e2fs_nlink > 2) { 878 error = ENOTEMPTY; 879 goto bad; 880 } 881 if (!doingdirectory) { 882 error = ENOTDIR; 883 goto bad; 884 } 885 cache_purge(tdvp); 886 } else if (doingdirectory) { 887 error = EISDIR; 888 goto bad; 889 } 890 error = ext2fs_dirrewrite(dp, ip, tcnp); 891 if (error != 0) 892 goto bad; 893 /* 894 * If the target directory is in the same 895 * directory as the source directory, 896 * decrement the link count on the parent 897 * of the target directory. 898 */ 899 if (doingdirectory && !newparent) { 900 dp->i_e2fs_nlink--; 901 dp->i_flag |= IN_CHANGE; 902 } 903 VN_KNOTE(tdvp, NOTE_WRITE); 904 vput(tdvp); 905 /* 906 * Adjust the link count of the target to 907 * reflect the dirrewrite above. If this is 908 * a directory it is empty and there are 909 * no links to it, so we can squash the inode and 910 * any space associated with it. We disallowed 911 * renaming over top of a directory with links to 912 * it above, as the remaining link would point to 913 * a directory without "." or ".." entries. 914 */ 915 xp->i_e2fs_nlink--; 916 if (doingdirectory) { 917 if (--xp->i_e2fs_nlink != 0) 918 panic("rename: linked directory"); 919 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 920 tcnp->cn_cred, tcnp->cn_lwp->l_proc); 921 } 922 xp->i_flag |= IN_CHANGE; 923 VN_KNOTE(tvp, NOTE_DELETE); 924 vput(tvp); 925 xp = NULL; 926 } 927 928 /* 929 * 3) Unlink the source. 930 */ 931 fcnp->cn_flags &= ~MODMASK; 932 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 933 if ((fcnp->cn_flags & SAVESTART) == 0) 934 panic("ext2fs_rename: lost from startdir"); 935 (void) relookup(fdvp, &fvp, fcnp); 936 if (fvp != NULL) { 937 xp = VTOI(fvp); 938 dp = VTOI(fdvp); 939 } else { 940 /* 941 * From name has disappeared. 942 */ 943 if (doingdirectory) 944 panic("ext2fs_rename: lost dir entry"); 945 vrele(ap->a_fvp); 946 return (0); 947 } 948 /* 949 * Ensure that the directory entry still exists and has not 950 * changed while the new name has been entered. If the source is 951 * a file then the entry may have been unlinked or renamed. In 952 * either case there is no further work to be done. If the source 953 * is a directory then it cannot have been rmdir'ed; its link 954 * count of three would cause a rmdir to fail with ENOTEMPTY. 955 * The IRENAME flag ensures that it cannot be moved by another 956 * rename. 957 */ 958 if (xp != ip) { 959 if (doingdirectory) 960 panic("ext2fs_rename: lost dir entry"); 961 } else { 962 /* 963 * If the source is a directory with a 964 * new parent, the link count of the old 965 * parent directory must be decremented 966 * and ".." set to point to the new parent. 967 */ 968 if (doingdirectory && newparent) { 969 dp->i_e2fs_nlink--; 970 dp->i_flag |= IN_CHANGE; 971 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 972 sizeof (struct ext2fs_dirtemplate), (off_t)0, 973 UIO_SYSSPACE, IO_NODELOCKED, 974 tcnp->cn_cred, (size_t *)0, NULL); 975 if (error == 0) { 976 namlen = dirbuf.dotdot_namlen; 977 if (namlen != 2 || 978 dirbuf.dotdot_name[0] != '.' || 979 dirbuf.dotdot_name[1] != '.') { 980 ufs_dirbad(xp, (doff_t)12, 981 "ext2fs_rename: mangled dir"); 982 } else { 983 dirbuf.dotdot_ino = h2fs32(newparent); 984 (void) vn_rdwr(UIO_WRITE, fvp, 985 (caddr_t)&dirbuf, 986 sizeof (struct dirtemplate), 987 (off_t)0, UIO_SYSSPACE, 988 IO_NODELOCKED|IO_SYNC, 989 tcnp->cn_cred, (size_t *)0, 990 NULL); 991 cache_purge(fdvp); 992 } 993 } 994 } 995 error = ext2fs_dirremove(fdvp, fcnp); 996 if (!error) { 997 xp->i_e2fs_nlink--; 998 xp->i_flag |= IN_CHANGE; 999 } 1000 xp->i_flag &= ~IN_RENAME; 1001 } 1002 VN_KNOTE(fvp, NOTE_RENAME); 1003 if (dp) 1004 vput(fdvp); 1005 if (xp) 1006 vput(fvp); 1007 vrele(ap->a_fvp); 1008 return (error); 1009 1010 bad: 1011 if (xp) 1012 vput(ITOV(xp)); 1013 vput(ITOV(dp)); 1014 out: 1015 if (doingdirectory) 1016 ip->i_flag &= ~IN_RENAME; 1017 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1018 ip->i_e2fs_nlink--; 1019 ip->i_flag |= IN_CHANGE; 1020 vput(fvp); 1021 } else 1022 vrele(fvp); 1023 return (error); 1024 } 1025 1026 /* 1027 * Mkdir system call 1028 */ 1029 int 1030 ext2fs_mkdir(void *v) 1031 { 1032 struct vop_mkdir_args /* { 1033 struct vnode *a_dvp; 1034 struct vnode **a_vpp; 1035 struct componentname *a_cnp; 1036 struct vattr *a_vap; 1037 } */ *ap = v; 1038 struct vnode *dvp = ap->a_dvp; 1039 struct vattr *vap = ap->a_vap; 1040 struct componentname *cnp = ap->a_cnp; 1041 struct inode *ip, *dp = VTOI(dvp); 1042 struct vnode *tvp; 1043 struct ext2fs_dirtemplate dirtemplate; 1044 int error, dmode; 1045 1046 #ifdef DIAGNOSTIC 1047 if ((cnp->cn_flags & HASBUF) == 0) 1048 panic("ext2fs_mkdir: no name"); 1049 #endif 1050 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1051 error = EMLINK; 1052 goto out; 1053 } 1054 dmode = vap->va_mode & ACCESSPERMS; 1055 dmode |= IFDIR; 1056 /* 1057 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1058 * but not have it entered in the parent directory. The entry is 1059 * made later after writing "." and ".." entries. 1060 */ 1061 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1062 goto out; 1063 ip = VTOI(tvp); 1064 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1065 ip->i_e2fs_gid = dp->i_e2fs_gid; 1066 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1067 ip->i_e2fs_mode = dmode; 1068 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1069 ip->i_e2fs_nlink = 2; 1070 1071 /* 1072 * Bump link count in parent directory 1073 * to reflect work done below. Should 1074 * be done before reference is created 1075 * so reparation is possible if we crash. 1076 */ 1077 dp->i_e2fs_nlink++; 1078 dp->i_flag |= IN_CHANGE; 1079 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1080 goto bad; 1081 1082 /* Initialize directory with "." and ".." from static template. */ 1083 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1084 dirtemplate.dot_ino = h2fs32(ip->i_number); 1085 dirtemplate.dot_reclen = h2fs16(12); 1086 dirtemplate.dot_namlen = 1; 1087 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1088 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1089 dirtemplate.dot_type = EXT2_FT_DIR; 1090 } 1091 dirtemplate.dot_name[0] = '.'; 1092 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1093 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1094 dirtemplate.dotdot_namlen = 2; 1095 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1096 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1097 dirtemplate.dotdot_type = EXT2_FT_DIR; 1098 } 1099 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1100 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1101 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1102 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1103 if (error) { 1104 dp->i_e2fs_nlink--; 1105 dp->i_flag |= IN_CHANGE; 1106 goto bad; 1107 } 1108 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1109 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1110 else { 1111 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1112 if (error) { 1113 dp->i_e2fs_nlink--; 1114 dp->i_flag |= IN_CHANGE; 1115 goto bad; 1116 } 1117 ip->i_flag |= IN_CHANGE; 1118 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1119 } 1120 1121 /* Directory set up, now install it's entry in the parent directory. */ 1122 error = ext2fs_direnter(ip, dvp, cnp); 1123 if (error != 0) { 1124 dp->i_e2fs_nlink--; 1125 dp->i_flag |= IN_CHANGE; 1126 } 1127 bad: 1128 /* 1129 * No need to do an explicit ext2fs_truncate here, vrele will do this 1130 * for us because we set the link count to 0. 1131 */ 1132 if (error) { 1133 ip->i_e2fs_nlink = 0; 1134 ip->i_flag |= IN_CHANGE; 1135 vput(tvp); 1136 } else { 1137 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1138 *ap->a_vpp = tvp; 1139 } 1140 out: 1141 PNBUF_PUT(cnp->cn_pnbuf); 1142 vput(dvp); 1143 return (error); 1144 } 1145 1146 /* 1147 * Rmdir system call. 1148 */ 1149 int 1150 ext2fs_rmdir(void *v) 1151 { 1152 struct vop_rmdir_args /* { 1153 struct vnode *a_dvp; 1154 struct vnode *a_vp; 1155 struct componentname *a_cnp; 1156 } */ *ap = v; 1157 struct vnode *vp = ap->a_vp; 1158 struct vnode *dvp = ap->a_dvp; 1159 struct componentname *cnp = ap->a_cnp; 1160 struct inode *ip, *dp; 1161 int error; 1162 1163 ip = VTOI(vp); 1164 dp = VTOI(dvp); 1165 /* 1166 * No rmdir "." please. 1167 */ 1168 if (dp == ip) { 1169 vrele(dvp); 1170 vput(vp); 1171 return (EINVAL); 1172 } 1173 /* 1174 * Verify the directory is empty (and valid). 1175 * (Rmdir ".." won't be valid since 1176 * ".." will contain a reference to 1177 * the current directory and thus be 1178 * non-empty.) 1179 */ 1180 error = 0; 1181 if (ip->i_e2fs_nlink != 2 || 1182 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1183 error = ENOTEMPTY; 1184 goto out; 1185 } 1186 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1187 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1188 error = EPERM; 1189 goto out; 1190 } 1191 /* 1192 * Delete reference to directory before purging 1193 * inode. If we crash in between, the directory 1194 * will be reattached to lost+found, 1195 */ 1196 error = ext2fs_dirremove(dvp, cnp); 1197 if (error != 0) 1198 goto out; 1199 dp->i_e2fs_nlink--; 1200 dp->i_flag |= IN_CHANGE; 1201 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1202 cache_purge(dvp); 1203 vput(dvp); 1204 dvp = NULL; 1205 /* 1206 * Truncate inode. The only stuff left 1207 * in the directory is "." and "..". The 1208 * "." reference is inconsequential since 1209 * we're quashing it. The ".." reference 1210 * has already been adjusted above. We've 1211 * removed the "." reference and the reference 1212 * in the parent directory, but there may be 1213 * other hard links so decrement by 2 and 1214 * worry about them later. 1215 */ 1216 ip->i_e2fs_nlink -= 2; 1217 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1218 cnp->cn_lwp->l_proc); 1219 cache_purge(ITOV(ip)); 1220 out: 1221 VN_KNOTE(vp, NOTE_DELETE); 1222 if (dvp) 1223 vput(dvp); 1224 vput(vp); 1225 return (error); 1226 } 1227 1228 /* 1229 * symlink -- make a symbolic link 1230 */ 1231 int 1232 ext2fs_symlink(void *v) 1233 { 1234 struct vop_symlink_args /* { 1235 struct vnode *a_dvp; 1236 struct vnode **a_vpp; 1237 struct componentname *a_cnp; 1238 struct vattr *a_vap; 1239 char *a_target; 1240 } */ *ap = v; 1241 struct vnode *vp, **vpp; 1242 struct inode *ip; 1243 int len, error; 1244 1245 vpp = ap->a_vpp; 1246 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1247 vpp, ap->a_cnp); 1248 if (error) 1249 return (error); 1250 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1251 vp = *vpp; 1252 len = strlen(ap->a_target); 1253 ip = VTOI(vp); 1254 if (len < ip->i_ump->um_maxsymlinklen) { 1255 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1256 error = ext2fs_setsize(ip, len); 1257 if (error) 1258 goto bad; 1259 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1260 uvm_vnp_setsize(vp, len); 1261 } else 1262 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1263 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1264 (size_t *)0, NULL); 1265 bad: 1266 if (error) 1267 vput(vp); 1268 return (error); 1269 } 1270 1271 /* 1272 * Return target name of a symbolic link 1273 */ 1274 int 1275 ext2fs_readlink(void *v) 1276 { 1277 struct vop_readlink_args /* { 1278 struct vnode *a_vp; 1279 struct uio *a_uio; 1280 kauth_cred_t a_cred; 1281 } */ *ap = v; 1282 struct vnode *vp = ap->a_vp; 1283 struct inode *ip = VTOI(vp); 1284 struct ufsmount *ump = ip->i_ump; 1285 int isize; 1286 1287 isize = ext2fs_size(ip); 1288 if (isize < ump->um_maxsymlinklen || 1289 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1290 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1291 return (0); 1292 } 1293 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1294 } 1295 1296 /* 1297 * Advisory record locking support 1298 */ 1299 int 1300 ext2fs_advlock(void *v) 1301 { 1302 struct vop_advlock_args /* { 1303 struct vnode *a_vp; 1304 caddr_t a_id; 1305 int a_op; 1306 struct flock *a_fl; 1307 int a_flags; 1308 } */ *ap = v; 1309 struct inode *ip = VTOI(ap->a_vp); 1310 1311 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1312 } 1313 1314 int 1315 ext2fs_fsync(void *v) 1316 { 1317 struct vop_fsync_args /* { 1318 struct vnode *a_vp; 1319 kauth_cred_t a_cred; 1320 int a_flags; 1321 off_t offlo; 1322 off_t offhi; 1323 struct proc *a_p; 1324 } */ *ap = v; 1325 struct vnode *vp = ap->a_vp; 1326 int wait; 1327 int error; 1328 1329 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1330 vflushbuf(vp, wait); 1331 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1332 error = 0; 1333 else 1334 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1335 1336 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1337 int l = 0; 1338 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1339 ap->a_l->l_proc->p_cred, ap->a_l); 1340 } 1341 1342 return error; 1343 } 1344 1345 /* 1346 * Initialize the vnode associated with a new inode, handle aliased 1347 * vnodes. 1348 */ 1349 int 1350 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1351 int (**fifoops)(void *), struct vnode **vpp) 1352 { 1353 struct inode *ip; 1354 struct vnode *vp, *nvp; 1355 1356 vp = *vpp; 1357 ip = VTOI(vp); 1358 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1359 case VCHR: 1360 case VBLK: 1361 vp->v_op = specops; 1362 if ((nvp = checkalias(vp, 1363 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1364 /* 1365 * Discard unneeded vnode, but save its inode. 1366 */ 1367 nvp->v_data = vp->v_data; 1368 vp->v_data = NULL; 1369 VOP_UNLOCK(vp, 0); 1370 vp->v_op = spec_vnodeop_p; 1371 vp->v_flag &= ~VLOCKSWORK; 1372 vrele(vp); 1373 vgone(vp); 1374 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1375 /* 1376 * Reinitialize aliased inode. 1377 */ 1378 vp = nvp; 1379 ip->i_vnode = vp; 1380 } 1381 break; 1382 case VFIFO: 1383 vp->v_op = fifoops; 1384 break; 1385 case VNON: 1386 case VBAD: 1387 case VSOCK: 1388 case VLNK: 1389 case VDIR: 1390 case VREG: 1391 break; 1392 } 1393 if (ip->i_number == ROOTINO) 1394 vp->v_flag |= VROOT; 1395 /* 1396 * Initialize modrev times 1397 */ 1398 SETHIGH(ip->i_modrev, mono_time.tv_sec); 1399 SETLOW(ip->i_modrev, mono_time.tv_usec * 4294); 1400 *vpp = vp; 1401 return (0); 1402 } 1403 1404 /* 1405 * Allocate a new inode. 1406 */ 1407 int 1408 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1409 struct componentname *cnp) 1410 { 1411 struct inode *ip, *pdir; 1412 struct vnode *tvp; 1413 int error, ismember; 1414 1415 pdir = VTOI(dvp); 1416 #ifdef DIAGNOSTIC 1417 if ((cnp->cn_flags & HASBUF) == 0) 1418 panic("ext2fs_makeinode: no name"); 1419 #endif 1420 *vpp = NULL; 1421 if ((mode & IFMT) == 0) 1422 mode |= IFREG; 1423 1424 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1425 PNBUF_PUT(cnp->cn_pnbuf); 1426 vput(dvp); 1427 return (error); 1428 } 1429 ip = VTOI(tvp); 1430 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1431 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1432 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1433 ip->i_e2fs_mode = mode; 1434 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1435 ip->i_e2fs_nlink = 1; 1436 error = kauth_cred_ismember_gid(cnp->cn_cred, ip->i_e2fs_gid, &ismember); 1437 if (error) 1438 goto bad; 1439 if ((ip->i_e2fs_mode & ISGID) && !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 if ((cnp->cn_flags & SAVESTART) == 0) 1452 PNBUF_PUT(cnp->cn_pnbuf); 1453 vput(dvp); 1454 *vpp = tvp; 1455 return (0); 1456 1457 bad: 1458 /* 1459 * Write error occurred trying to update the inode 1460 * or the directory so must deallocate the inode. 1461 */ 1462 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1463 ip->i_e2fs_nlink = 0; 1464 ip->i_flag |= IN_CHANGE; 1465 vput(tvp); 1466 PNBUF_PUT(cnp->cn_pnbuf); 1467 vput(dvp); 1468 return (error); 1469 } 1470 1471 /* 1472 * Reclaim an inode so that it can be used for other purposes. 1473 */ 1474 int 1475 ext2fs_reclaim(void *v) 1476 { 1477 struct vop_reclaim_args /* { 1478 struct vnode *a_vp; 1479 } */ *ap = v; 1480 struct vnode *vp = ap->a_vp; 1481 struct inode *ip = VTOI(vp); 1482 int error; 1483 1484 if ((error = ufs_reclaim(vp, ap->a_l)) != 0) 1485 return (error); 1486 if (ip->i_din.e2fs_din != NULL) 1487 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1488 pool_put(&ext2fs_inode_pool, vp->v_data); 1489 vp->v_data = NULL; 1490 return (0); 1491 } 1492 1493 /* Global vfs data structures for ext2fs. */ 1494 int (**ext2fs_vnodeop_p)(void *); 1495 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1496 { &vop_default_desc, vn_default_error }, 1497 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1498 { &vop_create_desc, ext2fs_create }, /* create */ 1499 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1500 { &vop_open_desc, ext2fs_open }, /* open */ 1501 { &vop_close_desc, ufs_close }, /* close */ 1502 { &vop_access_desc, ext2fs_access }, /* access */ 1503 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1504 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1505 { &vop_read_desc, ext2fs_read }, /* read */ 1506 { &vop_write_desc, ext2fs_write }, /* write */ 1507 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1508 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1509 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1510 { &vop_poll_desc, ufs_poll }, /* poll */ 1511 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1512 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1513 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1514 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1515 { &vop_seek_desc, ufs_seek }, /* seek */ 1516 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1517 { &vop_link_desc, ext2fs_link }, /* link */ 1518 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1519 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1520 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1521 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1522 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1523 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1524 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1525 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1526 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1527 { &vop_lock_desc, ufs_lock }, /* lock */ 1528 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1529 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1530 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1531 { &vop_print_desc, ufs_print }, /* print */ 1532 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1533 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1534 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1535 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1536 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1537 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1538 { NULL, NULL } 1539 }; 1540 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1541 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1542 1543 int (**ext2fs_specop_p)(void *); 1544 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1545 { &vop_default_desc, vn_default_error }, 1546 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1547 { &vop_create_desc, spec_create }, /* create */ 1548 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1549 { &vop_open_desc, spec_open }, /* open */ 1550 { &vop_close_desc, ufsspec_close }, /* close */ 1551 { &vop_access_desc, ext2fs_access }, /* access */ 1552 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1553 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1554 { &vop_read_desc, ufsspec_read }, /* read */ 1555 { &vop_write_desc, ufsspec_write }, /* write */ 1556 { &vop_lease_desc, spec_lease_check }, /* lease */ 1557 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1558 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1559 { &vop_poll_desc, spec_poll }, /* poll */ 1560 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1561 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1562 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1563 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1564 { &vop_seek_desc, spec_seek }, /* seek */ 1565 { &vop_remove_desc, spec_remove }, /* remove */ 1566 { &vop_link_desc, spec_link }, /* link */ 1567 { &vop_rename_desc, spec_rename }, /* rename */ 1568 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1569 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1570 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1571 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1572 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1573 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1574 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1575 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1576 { &vop_lock_desc, ufs_lock }, /* lock */ 1577 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1578 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1579 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1580 { &vop_print_desc, ufs_print }, /* print */ 1581 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1582 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1583 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1584 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1585 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1586 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1587 { NULL, NULL } 1588 }; 1589 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1590 { &ext2fs_specop_p, ext2fs_specop_entries }; 1591 1592 int (**ext2fs_fifoop_p)(void *); 1593 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1594 { &vop_default_desc, vn_default_error }, 1595 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1596 { &vop_create_desc, fifo_create }, /* create */ 1597 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1598 { &vop_open_desc, fifo_open }, /* open */ 1599 { &vop_close_desc, ufsfifo_close }, /* close */ 1600 { &vop_access_desc, ext2fs_access }, /* access */ 1601 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1602 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1603 { &vop_read_desc, ufsfifo_read }, /* read */ 1604 { &vop_write_desc, ufsfifo_write }, /* write */ 1605 { &vop_lease_desc, fifo_lease_check }, /* lease */ 1606 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1607 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1608 { &vop_poll_desc, fifo_poll }, /* poll */ 1609 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1610 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1611 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1612 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1613 { &vop_seek_desc, fifo_seek }, /* seek */ 1614 { &vop_remove_desc, fifo_remove }, /* remove */ 1615 { &vop_link_desc, fifo_link }, /* link */ 1616 { &vop_rename_desc, fifo_rename }, /* rename */ 1617 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1618 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1619 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1620 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1621 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1622 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1623 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1624 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1625 { &vop_lock_desc, ufs_lock }, /* lock */ 1626 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1627 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1628 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1629 { &vop_print_desc, ufs_print }, /* print */ 1630 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1631 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1632 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1633 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1634 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1635 { NULL, NULL } 1636 }; 1637 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1638 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1639
Indexes created Wed Oct 22 13:09:56 GMT 2025