ext2fs_vnops.c revision 1.64.10.1
1 /* $NetBSD: ext2fs_vnops.c,v 1.64.10.1 2006/03/08 01:39:11 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 1.64.10.1 2006/03/08 01:39:11 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 = generic_authorize(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 = generic_authorize(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; 446 447 if (kauth_cred_geteuid(cred) != ip->i_e2fs_uid && 448 (error = generic_authorize(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_groupmember(cred, ip->i_e2fs_gid) && (mode & ISGID)) 455 return (EPERM); 456 } 457 ip->i_e2fs_mode &= ~ALLPERMS; 458 ip->i_e2fs_mode |= (mode & ALLPERMS); 459 ip->i_flag |= IN_CHANGE; 460 return (0); 461 } 462 463 /* 464 * Perform chown operation on inode ip; 465 * inode must be locked prior to call. 466 */ 467 static int 468 ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 469 struct proc *p) 470 { 471 struct inode *ip = VTOI(vp); 472 uid_t ouid; 473 gid_t ogid; 474 int error = 0; 475 476 if (uid == (uid_t)VNOVAL) 477 uid = ip->i_e2fs_uid; 478 if (gid == (gid_t)VNOVAL) 479 gid = ip->i_e2fs_gid; 480 /* 481 * If we don't own the file, are trying to change the owner 482 * of the file, or are not a member of the target group, 483 * the caller must be superuser or the call fails. 484 */ 485 if ((kauth_cred_geteuid(cred) != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 486 (gid != ip->i_e2fs_gid && 487 !(kauth_cred_getegid(cred) == gid || kauth_cred_groupmember(cred, (gid_t)gid)))) && 488 (error = generic_authorize(cred, KAUTH_GENERIC_ISSUSER, 489 &p->p_acflag))) 490 return (error); 491 ogid = ip->i_e2fs_gid; 492 ouid = ip->i_e2fs_uid; 493 494 ip->i_e2fs_gid = gid; 495 ip->i_e2fs_uid = uid; 496 if (ouid != uid || ogid != gid) 497 ip->i_flag |= IN_CHANGE; 498 if (ouid != uid && kauth_cred_geteuid(cred) != 0) 499 ip->i_e2fs_mode &= ~ISUID; 500 if (ogid != gid && kauth_cred_geteuid(cred) != 0) 501 ip->i_e2fs_mode &= ~ISGID; 502 return (0); 503 } 504 505 int 506 ext2fs_remove(void *v) 507 { 508 struct vop_remove_args /* { 509 struct vnode *a_dvp; 510 struct vnode *a_vp; 511 struct componentname *a_cnp; 512 } */ *ap = v; 513 struct inode *ip; 514 struct vnode *vp = ap->a_vp; 515 struct vnode *dvp = ap->a_dvp; 516 int error; 517 518 ip = VTOI(vp); 519 if (vp->v_type == VDIR || 520 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 521 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 522 error = EPERM; 523 } else { 524 error = ext2fs_dirremove(dvp, ap->a_cnp); 525 if (error == 0) { 526 ip->i_e2fs_nlink--; 527 ip->i_flag |= IN_CHANGE; 528 } 529 } 530 531 VN_KNOTE(vp, NOTE_DELETE); 532 VN_KNOTE(dvp, NOTE_WRITE); 533 if (dvp == vp) 534 vrele(vp); 535 else 536 vput(vp); 537 vput(dvp); 538 return (error); 539 } 540 541 /* 542 * link vnode call 543 */ 544 int 545 ext2fs_link(void *v) 546 { 547 struct vop_link_args /* { 548 struct vnode *a_dvp; 549 struct vnode *a_vp; 550 struct componentname *a_cnp; 551 } */ *ap = v; 552 struct vnode *dvp = ap->a_dvp; 553 struct vnode *vp = ap->a_vp; 554 struct componentname *cnp = ap->a_cnp; 555 struct inode *ip; 556 int error; 557 558 #ifdef DIAGNOSTIC 559 if ((cnp->cn_flags & HASBUF) == 0) 560 panic("ext2fs_link: no name"); 561 #endif 562 if (vp->v_type == VDIR) { 563 VOP_ABORTOP(dvp, cnp); 564 error = EISDIR; 565 goto out2; 566 } 567 if (dvp->v_mount != vp->v_mount) { 568 VOP_ABORTOP(dvp, cnp); 569 error = EXDEV; 570 goto out2; 571 } 572 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 573 VOP_ABORTOP(dvp, cnp); 574 goto out2; 575 } 576 ip = VTOI(vp); 577 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 578 VOP_ABORTOP(dvp, cnp); 579 error = EMLINK; 580 goto out1; 581 } 582 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 583 VOP_ABORTOP(dvp, cnp); 584 error = EPERM; 585 goto out1; 586 } 587 ip->i_e2fs_nlink++; 588 ip->i_flag |= IN_CHANGE; 589 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 590 if (!error) 591 error = ext2fs_direnter(ip, dvp, cnp); 592 if (error) { 593 ip->i_e2fs_nlink--; 594 ip->i_flag |= IN_CHANGE; 595 } 596 PNBUF_PUT(cnp->cn_pnbuf); 597 out1: 598 if (dvp != vp) 599 VOP_UNLOCK(vp, 0); 600 out2: 601 VN_KNOTE(vp, NOTE_LINK); 602 VN_KNOTE(dvp, NOTE_WRITE); 603 vput(dvp); 604 return (error); 605 } 606 607 /* 608 * Rename system call. 609 * rename("foo", "bar"); 610 * is essentially 611 * unlink("bar"); 612 * link("foo", "bar"); 613 * unlink("foo"); 614 * but ``atomically''. Can't do full commit without saving state in the 615 * inode on disk which isn't feasible at this time. Best we can do is 616 * always guarantee the target exists. 617 * 618 * Basic algorithm is: 619 * 620 * 1) Bump link count on source while we're linking it to the 621 * target. This also ensure the inode won't be deleted out 622 * from underneath us while we work (it may be truncated by 623 * a concurrent `trunc' or `open' for creation). 624 * 2) Link source to destination. If destination already exists, 625 * delete it first. 626 * 3) Unlink source reference to inode if still around. If a 627 * directory was moved and the parent of the destination 628 * is different from the source, patch the ".." entry in the 629 * directory. 630 */ 631 int 632 ext2fs_rename(void *v) 633 { 634 struct vop_rename_args /* { 635 struct vnode *a_fdvp; 636 struct vnode *a_fvp; 637 struct componentname *a_fcnp; 638 struct vnode *a_tdvp; 639 struct vnode *a_tvp; 640 struct componentname *a_tcnp; 641 } */ *ap = v; 642 struct vnode *tvp = ap->a_tvp; 643 struct vnode *tdvp = ap->a_tdvp; 644 struct vnode *fvp = ap->a_fvp; 645 struct vnode *fdvp = ap->a_fdvp; 646 struct componentname *tcnp = ap->a_tcnp; 647 struct componentname *fcnp = ap->a_fcnp; 648 struct inode *ip, *xp, *dp; 649 struct ext2fs_dirtemplate dirbuf; 650 int doingdirectory = 0, oldparent = 0, newparent = 0; 651 int error = 0; 652 u_char namlen; 653 654 #ifdef DIAGNOSTIC 655 if ((tcnp->cn_flags & HASBUF) == 0 || 656 (fcnp->cn_flags & HASBUF) == 0) 657 panic("ext2fs_rename: no name"); 658 #endif 659 /* 660 * Check for cross-device rename. 661 */ 662 if ((fvp->v_mount != tdvp->v_mount) || 663 (tvp && (fvp->v_mount != tvp->v_mount))) { 664 error = EXDEV; 665 abortit: 666 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 667 if (tdvp == tvp) 668 vrele(tdvp); 669 else 670 vput(tdvp); 671 if (tvp) 672 vput(tvp); 673 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 674 vrele(fdvp); 675 vrele(fvp); 676 return (error); 677 } 678 679 /* 680 * Check if just deleting a link name. 681 */ 682 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 683 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 684 error = EPERM; 685 goto abortit; 686 } 687 if (fvp == tvp) { 688 if (fvp->v_type == VDIR) { 689 error = EINVAL; 690 goto abortit; 691 } 692 693 /* Release destination completely. */ 694 VOP_ABORTOP(tdvp, tcnp); 695 vput(tdvp); 696 vput(tvp); 697 698 /* Delete source. */ 699 vrele(fdvp); 700 vrele(fvp); 701 fcnp->cn_flags &= ~MODMASK; 702 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 703 if ((fcnp->cn_flags & SAVESTART) == 0) 704 panic("ext2fs_rename: lost from startdir"); 705 fcnp->cn_nameiop = DELETE; 706 (void) relookup(fdvp, &fvp, fcnp); 707 return (VOP_REMOVE(fdvp, fvp, fcnp)); 708 } 709 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 710 goto abortit; 711 dp = VTOI(fdvp); 712 ip = VTOI(fvp); 713 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 714 VOP_UNLOCK(fvp, 0); 715 error = EMLINK; 716 goto abortit; 717 } 718 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 719 (dp->i_e2fs_flags & EXT2_APPEND)) { 720 VOP_UNLOCK(fvp, 0); 721 error = EPERM; 722 goto abortit; 723 } 724 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 725 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 726 if (!error && tvp) 727 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, 728 tcnp->cn_lwp); 729 if (error) { 730 VOP_UNLOCK(fvp, 0); 731 error = EACCES; 732 goto abortit; 733 } 734 /* 735 * Avoid ".", "..", and aliases of "." for obvious reasons. 736 */ 737 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 738 dp == ip || 739 (fcnp->cn_flags&ISDOTDOT) || 740 (tcnp->cn_flags & ISDOTDOT) || 741 (ip->i_flag & IN_RENAME)) { 742 VOP_UNLOCK(fvp, 0); 743 error = EINVAL; 744 goto abortit; 745 } 746 ip->i_flag |= IN_RENAME; 747 oldparent = dp->i_number; 748 doingdirectory++; 749 } 750 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 751 vrele(fdvp); 752 753 /* 754 * When the target exists, both the directory 755 * and target vnodes are returned locked. 756 */ 757 dp = VTOI(tdvp); 758 xp = NULL; 759 if (tvp) 760 xp = VTOI(tvp); 761 762 /* 763 * 1) Bump link count while we're moving stuff 764 * around. If we crash somewhere before 765 * completing our work, the link count 766 * may be wrong, but correctable. 767 */ 768 ip->i_e2fs_nlink++; 769 ip->i_flag |= IN_CHANGE; 770 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 771 VOP_UNLOCK(fvp, 0); 772 goto bad; 773 } 774 775 /* 776 * If ".." must be changed (ie the directory gets a new 777 * parent) then the source directory must not be in the 778 * directory hierarchy above the target, as this would 779 * orphan everything below the source directory. Also 780 * the user must have write permission in the source so 781 * as to be able to change "..". We must repeat the call 782 * to namei, as the parent directory is unlocked by the 783 * call to checkpath(). 784 */ 785 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp); 786 VOP_UNLOCK(fvp, 0); 787 if (oldparent != dp->i_number) 788 newparent = dp->i_number; 789 if (doingdirectory && newparent) { 790 if (error) /* write access check above */ 791 goto bad; 792 if (xp != NULL) 793 vput(tvp); 794 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 795 if (error != 0) 796 goto out; 797 if ((tcnp->cn_flags & SAVESTART) == 0) 798 panic("ext2fs_rename: lost to startdir"); 799 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 800 goto out; 801 dp = VTOI(tdvp); 802 xp = NULL; 803 if (tvp) 804 xp = VTOI(tvp); 805 } 806 /* 807 * 2) If target doesn't exist, link the target 808 * to the source and unlink the source. 809 * Otherwise, rewrite the target directory 810 * entry to reference the source inode and 811 * expunge the original entry's existence. 812 */ 813 if (xp == NULL) { 814 if (dp->i_dev != ip->i_dev) 815 panic("rename: EXDEV"); 816 /* 817 * Account for ".." in new directory. 818 * When source and destination have the same 819 * parent we don't fool with the link count. 820 */ 821 if (doingdirectory && newparent) { 822 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 823 error = EMLINK; 824 goto bad; 825 } 826 dp->i_e2fs_nlink++; 827 dp->i_flag |= IN_CHANGE; 828 if ((error = ext2fs_update(tdvp, NULL, NULL, 829 UPDATE_WAIT)) != 0) 830 goto bad; 831 } 832 error = ext2fs_direnter(ip, tdvp, tcnp); 833 if (error != 0) { 834 if (doingdirectory && newparent) { 835 dp->i_e2fs_nlink--; 836 dp->i_flag |= IN_CHANGE; 837 (void)ext2fs_update(tdvp, NULL, NULL, 838 UPDATE_WAIT); 839 } 840 goto bad; 841 } 842 VN_KNOTE(tdvp, NOTE_WRITE); 843 vput(tdvp); 844 } else { 845 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 846 panic("rename: EXDEV"); 847 /* 848 * Short circuit rename(foo, foo). 849 */ 850 if (xp->i_number == ip->i_number) 851 panic("rename: same file"); 852 /* 853 * If the parent directory is "sticky", then the user must 854 * own the parent directory, or the destination of the rename, 855 * otherwise the destination may not be changed (except by 856 * root). This implements append-only directories. 857 */ 858 if ((dp->i_e2fs_mode & S_ISTXT) && kauth_cred_geteuid(tcnp->cn_cred) != 0 && 859 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_e2fs_uid && 860 xp->i_e2fs_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 861 error = EPERM; 862 goto bad; 863 } 864 /* 865 * Target must be empty if a directory and have no links 866 * to it. Also, ensure source and target are compatible 867 * (both directories, or both not directories). 868 */ 869 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 870 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 871 xp->i_e2fs_nlink > 2) { 872 error = ENOTEMPTY; 873 goto bad; 874 } 875 if (!doingdirectory) { 876 error = ENOTDIR; 877 goto bad; 878 } 879 cache_purge(tdvp); 880 } else if (doingdirectory) { 881 error = EISDIR; 882 goto bad; 883 } 884 error = ext2fs_dirrewrite(dp, ip, tcnp); 885 if (error != 0) 886 goto bad; 887 /* 888 * If the target directory is in the same 889 * directory as the source directory, 890 * decrement the link count on the parent 891 * of the target directory. 892 */ 893 if (doingdirectory && !newparent) { 894 dp->i_e2fs_nlink--; 895 dp->i_flag |= IN_CHANGE; 896 } 897 VN_KNOTE(tdvp, NOTE_WRITE); 898 vput(tdvp); 899 /* 900 * Adjust the link count of the target to 901 * reflect the dirrewrite above. If this is 902 * a directory it is empty and there are 903 * no links to it, so we can squash the inode and 904 * any space associated with it. We disallowed 905 * renaming over top of a directory with links to 906 * it above, as the remaining link would point to 907 * a directory without "." or ".." entries. 908 */ 909 xp->i_e2fs_nlink--; 910 if (doingdirectory) { 911 if (--xp->i_e2fs_nlink != 0) 912 panic("rename: linked directory"); 913 error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 914 tcnp->cn_cred, tcnp->cn_lwp->l_proc); 915 } 916 xp->i_flag |= IN_CHANGE; 917 VN_KNOTE(tvp, NOTE_DELETE); 918 vput(tvp); 919 xp = NULL; 920 } 921 922 /* 923 * 3) Unlink the source. 924 */ 925 fcnp->cn_flags &= ~MODMASK; 926 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 927 if ((fcnp->cn_flags & SAVESTART) == 0) 928 panic("ext2fs_rename: lost from startdir"); 929 (void) relookup(fdvp, &fvp, fcnp); 930 if (fvp != NULL) { 931 xp = VTOI(fvp); 932 dp = VTOI(fdvp); 933 } else { 934 /* 935 * From name has disappeared. 936 */ 937 if (doingdirectory) 938 panic("ext2fs_rename: lost dir entry"); 939 vrele(ap->a_fvp); 940 return (0); 941 } 942 /* 943 * Ensure that the directory entry still exists and has not 944 * changed while the new name has been entered. If the source is 945 * a file then the entry may have been unlinked or renamed. In 946 * either case there is no further work to be done. If the source 947 * is a directory then it cannot have been rmdir'ed; its link 948 * count of three would cause a rmdir to fail with ENOTEMPTY. 949 * The IRENAME flag ensures that it cannot be moved by another 950 * rename. 951 */ 952 if (xp != ip) { 953 if (doingdirectory) 954 panic("ext2fs_rename: lost dir entry"); 955 } else { 956 /* 957 * If the source is a directory with a 958 * new parent, the link count of the old 959 * parent directory must be decremented 960 * and ".." set to point to the new parent. 961 */ 962 if (doingdirectory && newparent) { 963 dp->i_e2fs_nlink--; 964 dp->i_flag |= IN_CHANGE; 965 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 966 sizeof (struct ext2fs_dirtemplate), (off_t)0, 967 UIO_SYSSPACE, IO_NODELOCKED, 968 tcnp->cn_cred, (size_t *)0, NULL); 969 if (error == 0) { 970 namlen = dirbuf.dotdot_namlen; 971 if (namlen != 2 || 972 dirbuf.dotdot_name[0] != '.' || 973 dirbuf.dotdot_name[1] != '.') { 974 ufs_dirbad(xp, (doff_t)12, 975 "ext2fs_rename: mangled dir"); 976 } else { 977 dirbuf.dotdot_ino = h2fs32(newparent); 978 (void) vn_rdwr(UIO_WRITE, fvp, 979 (caddr_t)&dirbuf, 980 sizeof (struct dirtemplate), 981 (off_t)0, UIO_SYSSPACE, 982 IO_NODELOCKED|IO_SYNC, 983 tcnp->cn_cred, (size_t *)0, 984 NULL); 985 cache_purge(fdvp); 986 } 987 } 988 } 989 error = ext2fs_dirremove(fdvp, fcnp); 990 if (!error) { 991 xp->i_e2fs_nlink--; 992 xp->i_flag |= IN_CHANGE; 993 } 994 xp->i_flag &= ~IN_RENAME; 995 } 996 VN_KNOTE(fvp, NOTE_RENAME); 997 if (dp) 998 vput(fdvp); 999 if (xp) 1000 vput(fvp); 1001 vrele(ap->a_fvp); 1002 return (error); 1003 1004 bad: 1005 if (xp) 1006 vput(ITOV(xp)); 1007 vput(ITOV(dp)); 1008 out: 1009 if (doingdirectory) 1010 ip->i_flag &= ~IN_RENAME; 1011 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1012 ip->i_e2fs_nlink--; 1013 ip->i_flag |= IN_CHANGE; 1014 vput(fvp); 1015 } else 1016 vrele(fvp); 1017 return (error); 1018 } 1019 1020 /* 1021 * Mkdir system call 1022 */ 1023 int 1024 ext2fs_mkdir(void *v) 1025 { 1026 struct vop_mkdir_args /* { 1027 struct vnode *a_dvp; 1028 struct vnode **a_vpp; 1029 struct componentname *a_cnp; 1030 struct vattr *a_vap; 1031 } */ *ap = v; 1032 struct vnode *dvp = ap->a_dvp; 1033 struct vattr *vap = ap->a_vap; 1034 struct componentname *cnp = ap->a_cnp; 1035 struct inode *ip, *dp = VTOI(dvp); 1036 struct vnode *tvp; 1037 struct ext2fs_dirtemplate dirtemplate; 1038 int error, dmode; 1039 1040 #ifdef DIAGNOSTIC 1041 if ((cnp->cn_flags & HASBUF) == 0) 1042 panic("ext2fs_mkdir: no name"); 1043 #endif 1044 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1045 error = EMLINK; 1046 goto out; 1047 } 1048 dmode = vap->va_mode & ACCESSPERMS; 1049 dmode |= IFDIR; 1050 /* 1051 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1052 * but not have it entered in the parent directory. The entry is 1053 * made later after writing "." and ".." entries. 1054 */ 1055 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1056 goto out; 1057 ip = VTOI(tvp); 1058 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1059 ip->i_e2fs_gid = dp->i_e2fs_gid; 1060 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1061 ip->i_e2fs_mode = dmode; 1062 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1063 ip->i_e2fs_nlink = 2; 1064 1065 /* 1066 * Bump link count in parent directory 1067 * to reflect work done below. Should 1068 * be done before reference is created 1069 * so reparation is possible if we crash. 1070 */ 1071 dp->i_e2fs_nlink++; 1072 dp->i_flag |= IN_CHANGE; 1073 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1074 goto bad; 1075 1076 /* Initialize directory with "." and ".." from static template. */ 1077 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1078 dirtemplate.dot_ino = h2fs32(ip->i_number); 1079 dirtemplate.dot_reclen = h2fs16(12); 1080 dirtemplate.dot_namlen = 1; 1081 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1082 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1083 dirtemplate.dot_type = EXT2_FT_DIR; 1084 } 1085 dirtemplate.dot_name[0] = '.'; 1086 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1087 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1088 dirtemplate.dotdot_namlen = 2; 1089 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1090 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1091 dirtemplate.dotdot_type = EXT2_FT_DIR; 1092 } 1093 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1094 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1095 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1096 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1097 if (error) { 1098 dp->i_e2fs_nlink--; 1099 dp->i_flag |= IN_CHANGE; 1100 goto bad; 1101 } 1102 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1103 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1104 else { 1105 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1106 if (error) { 1107 dp->i_e2fs_nlink--; 1108 dp->i_flag |= IN_CHANGE; 1109 goto bad; 1110 } 1111 ip->i_flag |= IN_CHANGE; 1112 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1113 } 1114 1115 /* Directory set up, now install it's entry in the parent directory. */ 1116 error = ext2fs_direnter(ip, dvp, cnp); 1117 if (error != 0) { 1118 dp->i_e2fs_nlink--; 1119 dp->i_flag |= IN_CHANGE; 1120 } 1121 bad: 1122 /* 1123 * No need to do an explicit ext2fs_truncate here, vrele will do this 1124 * for us because we set the link count to 0. 1125 */ 1126 if (error) { 1127 ip->i_e2fs_nlink = 0; 1128 ip->i_flag |= IN_CHANGE; 1129 vput(tvp); 1130 } else { 1131 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1132 *ap->a_vpp = tvp; 1133 } 1134 out: 1135 PNBUF_PUT(cnp->cn_pnbuf); 1136 vput(dvp); 1137 return (error); 1138 } 1139 1140 /* 1141 * Rmdir system call. 1142 */ 1143 int 1144 ext2fs_rmdir(void *v) 1145 { 1146 struct vop_rmdir_args /* { 1147 struct vnode *a_dvp; 1148 struct vnode *a_vp; 1149 struct componentname *a_cnp; 1150 } */ *ap = v; 1151 struct vnode *vp = ap->a_vp; 1152 struct vnode *dvp = ap->a_dvp; 1153 struct componentname *cnp = ap->a_cnp; 1154 struct inode *ip, *dp; 1155 int error; 1156 1157 ip = VTOI(vp); 1158 dp = VTOI(dvp); 1159 /* 1160 * No rmdir "." please. 1161 */ 1162 if (dp == ip) { 1163 vrele(dvp); 1164 vput(vp); 1165 return (EINVAL); 1166 } 1167 /* 1168 * Verify the directory is empty (and valid). 1169 * (Rmdir ".." won't be valid since 1170 * ".." will contain a reference to 1171 * the current directory and thus be 1172 * non-empty.) 1173 */ 1174 error = 0; 1175 if (ip->i_e2fs_nlink != 2 || 1176 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1177 error = ENOTEMPTY; 1178 goto out; 1179 } 1180 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1181 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1182 error = EPERM; 1183 goto out; 1184 } 1185 /* 1186 * Delete reference to directory before purging 1187 * inode. If we crash in between, the directory 1188 * will be reattached to lost+found, 1189 */ 1190 error = ext2fs_dirremove(dvp, cnp); 1191 if (error != 0) 1192 goto out; 1193 dp->i_e2fs_nlink--; 1194 dp->i_flag |= IN_CHANGE; 1195 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1196 cache_purge(dvp); 1197 vput(dvp); 1198 dvp = NULL; 1199 /* 1200 * Truncate inode. The only stuff left 1201 * in the directory is "." and "..". The 1202 * "." reference is inconsequential since 1203 * we're quashing it. The ".." reference 1204 * has already been adjusted above. We've 1205 * removed the "." reference and the reference 1206 * in the parent directory, but there may be 1207 * other hard links so decrement by 2 and 1208 * worry about them later. 1209 */ 1210 ip->i_e2fs_nlink -= 2; 1211 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1212 cnp->cn_lwp->l_proc); 1213 cache_purge(ITOV(ip)); 1214 out: 1215 VN_KNOTE(vp, NOTE_DELETE); 1216 if (dvp) 1217 vput(dvp); 1218 vput(vp); 1219 return (error); 1220 } 1221 1222 /* 1223 * symlink -- make a symbolic link 1224 */ 1225 int 1226 ext2fs_symlink(void *v) 1227 { 1228 struct vop_symlink_args /* { 1229 struct vnode *a_dvp; 1230 struct vnode **a_vpp; 1231 struct componentname *a_cnp; 1232 struct vattr *a_vap; 1233 char *a_target; 1234 } */ *ap = v; 1235 struct vnode *vp, **vpp; 1236 struct inode *ip; 1237 int len, error; 1238 1239 vpp = ap->a_vpp; 1240 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1241 vpp, ap->a_cnp); 1242 if (error) 1243 return (error); 1244 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1245 vp = *vpp; 1246 len = strlen(ap->a_target); 1247 ip = VTOI(vp); 1248 if (len < ip->i_ump->um_maxsymlinklen) { 1249 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1250 error = ext2fs_setsize(ip, len); 1251 if (error) 1252 goto bad; 1253 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1254 uvm_vnp_setsize(vp, len); 1255 } else 1256 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1257 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1258 (size_t *)0, NULL); 1259 bad: 1260 if (error) 1261 vput(vp); 1262 return (error); 1263 } 1264 1265 /* 1266 * Return target name of a symbolic link 1267 */ 1268 int 1269 ext2fs_readlink(void *v) 1270 { 1271 struct vop_readlink_args /* { 1272 struct vnode *a_vp; 1273 struct uio *a_uio; 1274 kauth_cred_t a_cred; 1275 } */ *ap = v; 1276 struct vnode *vp = ap->a_vp; 1277 struct inode *ip = VTOI(vp); 1278 struct ufsmount *ump = ip->i_ump; 1279 int isize; 1280 1281 isize = ext2fs_size(ip); 1282 if (isize < ump->um_maxsymlinklen || 1283 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1284 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1285 return (0); 1286 } 1287 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1288 } 1289 1290 /* 1291 * Advisory record locking support 1292 */ 1293 int 1294 ext2fs_advlock(void *v) 1295 { 1296 struct vop_advlock_args /* { 1297 struct vnode *a_vp; 1298 caddr_t a_id; 1299 int a_op; 1300 struct flock *a_fl; 1301 int a_flags; 1302 } */ *ap = v; 1303 struct inode *ip = VTOI(ap->a_vp); 1304 1305 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1306 } 1307 1308 int 1309 ext2fs_fsync(void *v) 1310 { 1311 struct vop_fsync_args /* { 1312 struct vnode *a_vp; 1313 kauth_cred_t a_cred; 1314 int a_flags; 1315 off_t offlo; 1316 off_t offhi; 1317 struct proc *a_p; 1318 } */ *ap = v; 1319 struct vnode *vp = ap->a_vp; 1320 int wait; 1321 int error; 1322 1323 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1324 vflushbuf(vp, wait); 1325 if ((ap->a_flags & FSYNC_DATAONLY) != 0) 1326 error = 0; 1327 else 1328 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1329 1330 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1331 int l = 0; 1332 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1333 ap->a_l->l_proc->p_cred, ap->a_l); 1334 } 1335 1336 return error; 1337 } 1338 1339 /* 1340 * Initialize the vnode associated with a new inode, handle aliased 1341 * vnodes. 1342 */ 1343 int 1344 ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1345 int (**fifoops)(void *), struct vnode **vpp) 1346 { 1347 struct inode *ip; 1348 struct vnode *vp, *nvp; 1349 1350 vp = *vpp; 1351 ip = VTOI(vp); 1352 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1353 case VCHR: 1354 case VBLK: 1355 vp->v_op = specops; 1356 if ((nvp = checkalias(vp, 1357 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1358 /* 1359 * Discard unneeded vnode, but save its inode. 1360 */ 1361 nvp->v_data = vp->v_data; 1362 vp->v_data = NULL; 1363 VOP_UNLOCK(vp, 0); 1364 vp->v_op = spec_vnodeop_p; 1365 vp->v_flag &= ~VLOCKSWORK; 1366 vrele(vp); 1367 vgone(vp); 1368 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1369 /* 1370 * Reinitialize aliased inode. 1371 */ 1372 vp = nvp; 1373 ip->i_vnode = vp; 1374 } 1375 break; 1376 case VFIFO: 1377 vp->v_op = fifoops; 1378 break; 1379 case VNON: 1380 case VBAD: 1381 case VSOCK: 1382 case VLNK: 1383 case VDIR: 1384 case VREG: 1385 break; 1386 } 1387 if (ip->i_number == ROOTINO) 1388 vp->v_flag |= VROOT; 1389 /* 1390 * Initialize modrev times 1391 */ 1392 SETHIGH(ip->i_modrev, mono_time.tv_sec); 1393 SETLOW(ip->i_modrev, mono_time.tv_usec * 4294); 1394 *vpp = vp; 1395 return (0); 1396 } 1397 1398 /* 1399 * Allocate a new inode. 1400 */ 1401 int 1402 ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1403 struct componentname *cnp) 1404 { 1405 struct inode *ip, *pdir; 1406 struct vnode *tvp; 1407 int error; 1408 1409 pdir = VTOI(dvp); 1410 #ifdef DIAGNOSTIC 1411 if ((cnp->cn_flags & HASBUF) == 0) 1412 panic("ext2fs_makeinode: no name"); 1413 #endif 1414 *vpp = NULL; 1415 if ((mode & IFMT) == 0) 1416 mode |= IFREG; 1417 1418 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1419 PNBUF_PUT(cnp->cn_pnbuf); 1420 vput(dvp); 1421 return (error); 1422 } 1423 ip = VTOI(tvp); 1424 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1425 ip->i_e2fs_uid = kauth_cred_geteuid(cnp->cn_cred); 1426 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1427 ip->i_e2fs_mode = mode; 1428 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1429 ip->i_e2fs_nlink = 1; 1430 if ((ip->i_e2fs_mode & ISGID) && 1431 !kauth_cred_groupmember(cnp->cn_cred, ip->i_e2fs_gid) && 1432 generic_authorize(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1433 ip->i_e2fs_mode &= ~ISGID; 1434 1435 /* 1436 * Make sure inode goes to disk before directory entry. 1437 */ 1438 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1439 goto bad; 1440 error = ext2fs_direnter(ip, dvp, cnp); 1441 if (error != 0) 1442 goto bad; 1443 if ((cnp->cn_flags & SAVESTART) == 0) 1444 PNBUF_PUT(cnp->cn_pnbuf); 1445 vput(dvp); 1446 *vpp = tvp; 1447 return (0); 1448 1449 bad: 1450 /* 1451 * Write error occurred trying to update the inode 1452 * or the directory so must deallocate the inode. 1453 */ 1454 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1455 ip->i_e2fs_nlink = 0; 1456 ip->i_flag |= IN_CHANGE; 1457 vput(tvp); 1458 PNBUF_PUT(cnp->cn_pnbuf); 1459 vput(dvp); 1460 return (error); 1461 } 1462 1463 /* 1464 * Reclaim an inode so that it can be used for other purposes. 1465 */ 1466 int 1467 ext2fs_reclaim(void *v) 1468 { 1469 struct vop_reclaim_args /* { 1470 struct vnode *a_vp; 1471 } */ *ap = v; 1472 struct vnode *vp = ap->a_vp; 1473 struct inode *ip = VTOI(vp); 1474 int error; 1475 1476 if ((error = ufs_reclaim(vp, ap->a_l)) != 0) 1477 return (error); 1478 if (ip->i_din.e2fs_din != NULL) 1479 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1480 pool_put(&ext2fs_inode_pool, vp->v_data); 1481 vp->v_data = NULL; 1482 return (0); 1483 } 1484 1485 /* Global vfs data structures for ext2fs. */ 1486 int (**ext2fs_vnodeop_p)(void *); 1487 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1488 { &vop_default_desc, vn_default_error }, 1489 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1490 { &vop_create_desc, ext2fs_create }, /* create */ 1491 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1492 { &vop_open_desc, ext2fs_open }, /* open */ 1493 { &vop_close_desc, ufs_close }, /* close */ 1494 { &vop_access_desc, ext2fs_access }, /* access */ 1495 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1496 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1497 { &vop_read_desc, ext2fs_read }, /* read */ 1498 { &vop_write_desc, ext2fs_write }, /* write */ 1499 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1500 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1501 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1502 { &vop_poll_desc, ufs_poll }, /* poll */ 1503 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1504 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1505 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1506 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1507 { &vop_seek_desc, ufs_seek }, /* seek */ 1508 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1509 { &vop_link_desc, ext2fs_link }, /* link */ 1510 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1511 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1512 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1513 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1514 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1515 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1516 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1517 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1518 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1519 { &vop_lock_desc, ufs_lock }, /* lock */ 1520 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1521 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1522 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1523 { &vop_print_desc, ufs_print }, /* print */ 1524 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1525 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1526 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1527 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1528 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1529 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1530 { NULL, NULL } 1531 }; 1532 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1533 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1534 1535 int (**ext2fs_specop_p)(void *); 1536 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1537 { &vop_default_desc, vn_default_error }, 1538 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1539 { &vop_create_desc, spec_create }, /* create */ 1540 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1541 { &vop_open_desc, spec_open }, /* open */ 1542 { &vop_close_desc, ufsspec_close }, /* close */ 1543 { &vop_access_desc, ext2fs_access }, /* access */ 1544 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1545 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1546 { &vop_read_desc, ufsspec_read }, /* read */ 1547 { &vop_write_desc, ufsspec_write }, /* write */ 1548 { &vop_lease_desc, spec_lease_check }, /* lease */ 1549 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1550 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1551 { &vop_poll_desc, spec_poll }, /* poll */ 1552 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1553 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1554 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1555 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1556 { &vop_seek_desc, spec_seek }, /* seek */ 1557 { &vop_remove_desc, spec_remove }, /* remove */ 1558 { &vop_link_desc, spec_link }, /* link */ 1559 { &vop_rename_desc, spec_rename }, /* rename */ 1560 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1561 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1562 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1563 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1564 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1565 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1566 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1567 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1568 { &vop_lock_desc, ufs_lock }, /* lock */ 1569 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1570 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1571 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1572 { &vop_print_desc, ufs_print }, /* print */ 1573 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1574 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1575 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1576 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1577 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1578 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1579 { NULL, NULL } 1580 }; 1581 const struct vnodeopv_desc ext2fs_specop_opv_desc = 1582 { &ext2fs_specop_p, ext2fs_specop_entries }; 1583 1584 int (**ext2fs_fifoop_p)(void *); 1585 const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1586 { &vop_default_desc, vn_default_error }, 1587 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 1588 { &vop_create_desc, fifo_create }, /* create */ 1589 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 1590 { &vop_open_desc, fifo_open }, /* open */ 1591 { &vop_close_desc, ufsfifo_close }, /* close */ 1592 { &vop_access_desc, ext2fs_access }, /* access */ 1593 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1594 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1595 { &vop_read_desc, ufsfifo_read }, /* read */ 1596 { &vop_write_desc, ufsfifo_write }, /* write */ 1597 { &vop_lease_desc, fifo_lease_check }, /* lease */ 1598 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 1599 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1600 { &vop_poll_desc, fifo_poll }, /* poll */ 1601 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 1602 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 1603 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 1604 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1605 { &vop_seek_desc, fifo_seek }, /* seek */ 1606 { &vop_remove_desc, fifo_remove }, /* remove */ 1607 { &vop_link_desc, fifo_link }, /* link */ 1608 { &vop_rename_desc, fifo_rename }, /* rename */ 1609 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 1610 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 1611 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 1612 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 1613 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 1614 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 1615 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1616 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1617 { &vop_lock_desc, ufs_lock }, /* lock */ 1618 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1619 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 1620 { &vop_strategy_desc, fifo_strategy }, /* strategy */ 1621 { &vop_print_desc, ufs_print }, /* print */ 1622 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1623 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 1624 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 1625 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1626 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1627 { NULL, NULL } 1628 }; 1629 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1630 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1631
Indexes created Mon Oct 20 11:09:49 GMT 2025