ext2fs_vnops.c revision 1.52
1 /* $NetBSD: ext2fs_vnops.c,v 1.52 2004/03/22 19:23:08 bouyer 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 1.52 2004/03/22 19:23:08 bouyer 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 106 __P((struct vnode *, int, struct ucred *, struct proc *)); 107 static int ext2fs_chown 108 __P((struct vnode *, uid_t, gid_t, struct ucred *, struct proc *)); 109 110 union _qcvt { 111 int64_t qcvt; 112 int32_t val[2]; 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(v) 132 void *v; 133 { 134 struct vop_create_args /* { 135 struct vnode *a_dvp; 136 struct vnode **a_vpp; 137 struct componentname *a_cnp; 138 struct vattr *a_vap; 139 } */ *ap = v; 140 int error; 141 142 error = 143 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 144 ap->a_dvp, ap->a_vpp, ap->a_cnp); 145 146 if (error) 147 return (error); 148 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 149 return (0); 150 } 151 152 /* 153 * Mknod vnode call 154 */ 155 /* ARGSUSED */ 156 int 157 ext2fs_mknod(v) 158 void *v; 159 { 160 struct vop_mknod_args /* { 161 struct vnode *a_dvp; 162 struct vnode **a_vpp; 163 struct componentname *a_cnp; 164 struct vattr *a_vap; 165 } */ *ap = v; 166 struct vattr *vap = ap->a_vap; 167 struct vnode **vpp = ap->a_vpp; 168 struct inode *ip; 169 int error; 170 struct mount *mp; 171 ino_t ino; 172 173 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 174 ap->a_dvp, vpp, ap->a_cnp)) != 0) 175 return (error); 176 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 177 ip = VTOI(*vpp); 178 mp = (*vpp)->v_mount; 179 ino = ip->i_number; 180 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 181 if (vap->va_rdev != VNOVAL) { 182 /* 183 * Want to be able to use this to make badblock 184 * inodes, so don't truncate the dev number. 185 */ 186 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 187 } 188 /* 189 * Remove inode so that it will be reloaded by VFS_VGET and 190 * checked to see if it is an alias of an existing entry in 191 * the inode cache. 192 */ 193 vput(*vpp); 194 (*vpp)->v_type = VNON; 195 vgone(*vpp); 196 error = VFS_VGET(mp, ino, vpp); 197 if (error != 0) { 198 *vpp = NULL; 199 return (error); 200 } 201 return (0); 202 } 203 204 /* 205 * Open called. 206 * 207 * Just check the APPEND flag. 208 */ 209 /* ARGSUSED */ 210 int 211 ext2fs_open(v) 212 void *v; 213 { 214 struct vop_open_args /* { 215 struct vnode *a_vp; 216 int a_mode; 217 struct ucred *a_cred; 218 struct proc *a_p; 219 } */ *ap = v; 220 221 /* 222 * Files marked append-only must be opened for appending. 223 */ 224 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 225 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 226 return (EPERM); 227 return (0); 228 } 229 230 int 231 ext2fs_access(v) 232 void *v; 233 { 234 struct vop_access_args /* { 235 struct vnode *a_vp; 236 int a_mode; 237 struct ucred *a_cred; 238 struct proc *a_p; 239 } */ *ap = v; 240 struct vnode *vp = ap->a_vp; 241 struct inode *ip = VTOI(vp); 242 mode_t mode = ap->a_mode; 243 244 /* 245 * Disallow write attempts on read-only file systems; 246 * unless the file is a socket, fifo, or a block or 247 * character device resident on the file system. 248 */ 249 if (mode & VWRITE) { 250 switch (vp->v_type) { 251 case VDIR: 252 case VLNK: 253 case VREG: 254 if (vp->v_mount->mnt_flag & MNT_RDONLY) 255 return (EROFS); 256 break; 257 default: 258 break; 259 } 260 } 261 262 /* If immutable bit set, nobody gets to write it. */ 263 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 264 return (EPERM); 265 266 return (vaccess(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 267 ip->i_e2fs_uid, ip->i_e2fs_gid, mode, ap->a_cred)); 268 } 269 270 /* ARGSUSED */ 271 int 272 ext2fs_getattr(v) 273 void *v; 274 { 275 struct vop_getattr_args /* { 276 struct vnode *a_vp; 277 struct vattr *a_vap; 278 struct ucred *a_cred; 279 struct proc *a_p; 280 } */ *ap = v; 281 struct vnode *vp = ap->a_vp; 282 struct inode *ip = VTOI(vp); 283 struct vattr *vap = ap->a_vap; 284 struct timespec ts; 285 286 TIMEVAL_TO_TIMESPEC(&time, &ts); 287 EXT2FS_ITIMES(ip, &ts, &ts, &ts); 288 /* 289 * Copy from inode table 290 */ 291 vap->va_fsid = ip->i_dev; 292 vap->va_fileid = ip->i_number; 293 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 294 vap->va_nlink = ip->i_e2fs_nlink; 295 vap->va_uid = ip->i_e2fs_uid; 296 vap->va_gid = ip->i_e2fs_gid; 297 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 298 vap->va_size = vp->v_size; 299 vap->va_atime.tv_sec = ip->i_e2fs_atime; 300 vap->va_atime.tv_nsec = 0; 301 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 302 vap->va_mtime.tv_nsec = 0; 303 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 304 vap->va_ctime.tv_nsec = 0; 305 #ifdef EXT2FS_SYSTEM_FLAGS 306 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 307 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 308 #else 309 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 310 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 311 #endif 312 vap->va_gen = ip->i_e2fs_gen; 313 /* this doesn't belong here */ 314 if (vp->v_type == VBLK) 315 vap->va_blocksize = BLKDEV_IOSIZE; 316 else if (vp->v_type == VCHR) 317 vap->va_blocksize = MAXBSIZE; 318 else 319 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 320 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 321 vap->va_type = vp->v_type; 322 vap->va_filerev = ip->i_modrev; 323 return (0); 324 } 325 326 /* 327 * Set attribute vnode op. called from several syscalls 328 */ 329 int 330 ext2fs_setattr(v) 331 void *v; 332 { 333 struct vop_setattr_args /* { 334 struct vnode *a_vp; 335 struct vattr *a_vap; 336 struct ucred *a_cred; 337 struct proc *a_p; 338 } */ *ap = v; 339 struct vattr *vap = ap->a_vap; 340 struct vnode *vp = ap->a_vp; 341 struct inode *ip = VTOI(vp); 342 struct ucred *cred = ap->a_cred; 343 struct proc *p = ap->a_p; 344 int error; 345 346 /* 347 * Check for unsettable attributes. 348 */ 349 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 350 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 351 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 352 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 353 return (EINVAL); 354 } 355 if (vap->va_flags != VNOVAL) { 356 if (vp->v_mount->mnt_flag & MNT_RDONLY) 357 return (EROFS); 358 if (cred->cr_uid != ip->i_e2fs_uid && 359 (error = suser(cred, &p->p_acflag))) 360 return (error); 361 #ifdef EXT2FS_SYSTEM_FLAGS 362 if (cred->cr_uid == 0) { 363 if ((ip->i_e2fs_flags & 364 (EXT2_APPEND | EXT2_IMMUTABLE)) && securelevel > 0) 365 return (EPERM); 366 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 367 ip->i_e2fs_flags |= 368 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 369 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 370 } else 371 return (EPERM); 372 #else 373 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 374 ip->i_e2fs_flags |= 375 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 376 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 377 #endif 378 ip->i_flag |= IN_CHANGE; 379 if (vap->va_flags & (IMMUTABLE | APPEND)) 380 return (0); 381 } 382 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 383 return (EPERM); 384 /* 385 * Go through the fields and update iff not VNOVAL. 386 */ 387 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 388 if (vp->v_mount->mnt_flag & MNT_RDONLY) 389 return (EROFS); 390 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 391 if (error) 392 return (error); 393 } 394 if (vap->va_size != VNOVAL) { 395 /* 396 * Disallow write attempts on read-only file systems; 397 * unless the file is a socket, fifo, or a block or 398 * character device resident on the file system. 399 */ 400 switch (vp->v_type) { 401 case VDIR: 402 return (EISDIR); 403 case VLNK: 404 case VREG: 405 if (vp->v_mount->mnt_flag & MNT_RDONLY) 406 return (EROFS); 407 default: 408 break; 409 } 410 error = VOP_TRUNCATE(vp, vap->va_size, 0, cred, p); 411 if (error) 412 return (error); 413 } 414 ip = VTOI(vp); 415 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 416 if (vp->v_mount->mnt_flag & MNT_RDONLY) 417 return (EROFS); 418 if (cred->cr_uid != ip->i_e2fs_uid && 419 (error = suser(cred, &p->p_acflag)) && 420 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 421 (error = VOP_ACCESS(vp, VWRITE, cred, p)))) 422 return (error); 423 if (vap->va_atime.tv_sec != VNOVAL) 424 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 425 ip->i_flag |= IN_ACCESS; 426 if (vap->va_mtime.tv_sec != VNOVAL) 427 ip->i_flag |= IN_CHANGE | IN_UPDATE; 428 error = VOP_UPDATE(vp, &vap->va_atime, &vap->va_mtime, 429 UPDATE_WAIT); 430 if (error) 431 return (error); 432 } 433 error = 0; 434 if (vap->va_mode != (mode_t)VNOVAL) { 435 if (vp->v_mount->mnt_flag & MNT_RDONLY) 436 return (EROFS); 437 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, p); 438 } 439 VN_KNOTE(vp, NOTE_ATTRIB); 440 return (error); 441 } 442 443 /* 444 * Change the mode on a file. 445 * Inode must be locked before calling. 446 */ 447 static int 448 ext2fs_chmod(vp, mode, cred, p) 449 struct vnode *vp; 450 int mode; 451 struct ucred *cred; 452 struct proc *p; 453 { 454 struct inode *ip = VTOI(vp); 455 int error; 456 457 if (cred->cr_uid != ip->i_e2fs_uid && 458 (error = suser(cred, &p->p_acflag))) 459 return (error); 460 if (cred->cr_uid) { 461 if (vp->v_type != VDIR && (mode & S_ISTXT)) 462 return (EFTYPE); 463 if (!groupmember(ip->i_e2fs_gid, cred) && (mode & ISGID)) 464 return (EPERM); 465 } 466 ip->i_e2fs_mode &= ~ALLPERMS; 467 ip->i_e2fs_mode |= (mode & ALLPERMS); 468 ip->i_flag |= IN_CHANGE; 469 return (0); 470 } 471 472 /* 473 * Perform chown operation on inode ip; 474 * inode must be locked prior to call. 475 */ 476 static int 477 ext2fs_chown(vp, uid, gid, cred, p) 478 struct vnode *vp; 479 uid_t uid; 480 gid_t gid; 481 struct ucred *cred; 482 struct proc *p; 483 { 484 struct inode *ip = VTOI(vp); 485 uid_t ouid; 486 gid_t ogid; 487 int error = 0; 488 489 if (uid == (uid_t)VNOVAL) 490 uid = ip->i_e2fs_uid; 491 if (gid == (gid_t)VNOVAL) 492 gid = ip->i_e2fs_gid; 493 /* 494 * If we don't own the file, are trying to change the owner 495 * of the file, or are not a member of the target group, 496 * the caller must be superuser or the call fails. 497 */ 498 if ((cred->cr_uid != ip->i_e2fs_uid || uid != ip->i_e2fs_uid || 499 (gid != ip->i_e2fs_gid && !groupmember((gid_t)gid, cred))) && 500 (error = suser(cred, &p->p_acflag))) 501 return (error); 502 ogid = ip->i_e2fs_gid; 503 ouid = ip->i_e2fs_uid; 504 505 ip->i_e2fs_gid = gid; 506 ip->i_e2fs_uid = uid; 507 if (ouid != uid || ogid != gid) 508 ip->i_flag |= IN_CHANGE; 509 if (ouid != uid && cred->cr_uid != 0) 510 ip->i_e2fs_mode &= ~ISUID; 511 if (ogid != gid && cred->cr_uid != 0) 512 ip->i_e2fs_mode &= ~ISGID; 513 return (0); 514 } 515 516 int 517 ext2fs_remove(v) 518 void *v; 519 { 520 struct vop_remove_args /* { 521 struct vnode *a_dvp; 522 struct vnode *a_vp; 523 struct componentname *a_cnp; 524 } */ *ap = v; 525 struct inode *ip; 526 struct vnode *vp = ap->a_vp; 527 struct vnode *dvp = ap->a_dvp; 528 int error; 529 530 ip = VTOI(vp); 531 if (vp->v_type == VDIR || 532 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 533 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 534 error = EPERM; 535 } else { 536 error = ext2fs_dirremove(dvp, ap->a_cnp); 537 if (error == 0) { 538 ip->i_e2fs_nlink--; 539 ip->i_flag |= IN_CHANGE; 540 } 541 } 542 543 VN_KNOTE(vp, NOTE_DELETE); 544 VN_KNOTE(dvp, NOTE_WRITE); 545 if (dvp == vp) 546 vrele(vp); 547 else 548 vput(vp); 549 vput(dvp); 550 return (error); 551 } 552 553 /* 554 * link vnode call 555 */ 556 int 557 ext2fs_link(v) 558 void *v; 559 { 560 struct vop_link_args /* { 561 struct vnode *a_dvp; 562 struct vnode *a_vp; 563 struct componentname *a_cnp; 564 } */ *ap = v; 565 struct vnode *dvp = ap->a_dvp; 566 struct vnode *vp = ap->a_vp; 567 struct componentname *cnp = ap->a_cnp; 568 struct inode *ip; 569 int error; 570 571 #ifdef DIAGNOSTIC 572 if ((cnp->cn_flags & HASBUF) == 0) 573 panic("ext2fs_link: no name"); 574 #endif 575 if (vp->v_type == VDIR) { 576 VOP_ABORTOP(dvp, cnp); 577 error = EISDIR; 578 goto out2; 579 } 580 if (dvp->v_mount != vp->v_mount) { 581 VOP_ABORTOP(dvp, cnp); 582 error = EXDEV; 583 goto out2; 584 } 585 if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) { 586 VOP_ABORTOP(dvp, cnp); 587 goto out2; 588 } 589 ip = VTOI(vp); 590 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 591 VOP_ABORTOP(dvp, cnp); 592 error = EMLINK; 593 goto out1; 594 } 595 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 596 VOP_ABORTOP(dvp, cnp); 597 error = EPERM; 598 goto out1; 599 } 600 ip->i_e2fs_nlink++; 601 ip->i_flag |= IN_CHANGE; 602 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_WAIT); 603 if (!error) 604 error = ext2fs_direnter(ip, dvp, cnp); 605 if (error) { 606 ip->i_e2fs_nlink--; 607 ip->i_flag |= IN_CHANGE; 608 } 609 PNBUF_PUT(cnp->cn_pnbuf); 610 out1: 611 if (dvp != vp) 612 VOP_UNLOCK(vp, 0); 613 out2: 614 VN_KNOTE(vp, NOTE_LINK); 615 VN_KNOTE(dvp, NOTE_WRITE); 616 vput(dvp); 617 return (error); 618 } 619 620 /* 621 * Rename system call. 622 * rename("foo", "bar"); 623 * is essentially 624 * unlink("bar"); 625 * link("foo", "bar"); 626 * unlink("foo"); 627 * but ``atomically''. Can't do full commit without saving state in the 628 * inode on disk which isn't feasible at this time. Best we can do is 629 * always guarantee the target exists. 630 * 631 * Basic algorithm is: 632 * 633 * 1) Bump link count on source while we're linking it to the 634 * target. This also ensure the inode won't be deleted out 635 * from underneath us while we work (it may be truncated by 636 * a concurrent `trunc' or `open' for creation). 637 * 2) Link source to destination. If destination already exists, 638 * delete it first. 639 * 3) Unlink source reference to inode if still around. If a 640 * directory was moved and the parent of the destination 641 * is different from the source, patch the ".." entry in the 642 * directory. 643 */ 644 int 645 ext2fs_rename(v) 646 void *v; 647 { 648 struct vop_rename_args /* { 649 struct vnode *a_fdvp; 650 struct vnode *a_fvp; 651 struct componentname *a_fcnp; 652 struct vnode *a_tdvp; 653 struct vnode *a_tvp; 654 struct componentname *a_tcnp; 655 } */ *ap = v; 656 struct vnode *tvp = ap->a_tvp; 657 struct vnode *tdvp = ap->a_tdvp; 658 struct vnode *fvp = ap->a_fvp; 659 struct vnode *fdvp = ap->a_fdvp; 660 struct componentname *tcnp = ap->a_tcnp; 661 struct componentname *fcnp = ap->a_fcnp; 662 struct inode *ip, *xp, *dp; 663 struct ext2fs_dirtemplate dirbuf; 664 int doingdirectory = 0, oldparent = 0, newparent = 0; 665 int error = 0; 666 u_char namlen; 667 668 #ifdef DIAGNOSTIC 669 if ((tcnp->cn_flags & HASBUF) == 0 || 670 (fcnp->cn_flags & HASBUF) == 0) 671 panic("ext2fs_rename: no name"); 672 #endif 673 /* 674 * Check for cross-device rename. 675 */ 676 if ((fvp->v_mount != tdvp->v_mount) || 677 (tvp && (fvp->v_mount != tvp->v_mount))) { 678 error = EXDEV; 679 abortit: 680 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 681 if (tdvp == tvp) 682 vrele(tdvp); 683 else 684 vput(tdvp); 685 if (tvp) 686 vput(tvp); 687 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 688 vrele(fdvp); 689 vrele(fvp); 690 return (error); 691 } 692 693 /* 694 * Check if just deleting a link name. 695 */ 696 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 697 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 698 error = EPERM; 699 goto abortit; 700 } 701 if (fvp == tvp) { 702 if (fvp->v_type == VDIR) { 703 error = EINVAL; 704 goto abortit; 705 } 706 707 /* Release destination completely. */ 708 VOP_ABORTOP(tdvp, tcnp); 709 vput(tdvp); 710 vput(tvp); 711 712 /* Delete source. */ 713 vrele(fdvp); 714 vrele(fvp); 715 fcnp->cn_flags &= ~MODMASK; 716 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 717 if ((fcnp->cn_flags & SAVESTART) == 0) 718 panic("ext2fs_rename: lost from startdir"); 719 fcnp->cn_nameiop = DELETE; 720 (void) relookup(fdvp, &fvp, fcnp); 721 return (VOP_REMOVE(fdvp, fvp, fcnp)); 722 } 723 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 724 goto abortit; 725 dp = VTOI(fdvp); 726 ip = VTOI(fvp); 727 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 728 VOP_UNLOCK(fvp, 0); 729 error = EMLINK; 730 goto abortit; 731 } 732 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 733 (dp->i_e2fs_flags & EXT2_APPEND)) { 734 VOP_UNLOCK(fvp, 0); 735 error = EPERM; 736 goto abortit; 737 } 738 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 739 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); 740 if (!error && tvp) 741 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred, 742 tcnp->cn_proc); 743 if (error) { 744 VOP_UNLOCK(fvp, 0); 745 error = EACCES; 746 goto abortit; 747 } 748 /* 749 * Avoid ".", "..", and aliases of "." for obvious reasons. 750 */ 751 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 752 dp == ip || 753 (fcnp->cn_flags&ISDOTDOT) || 754 (tcnp->cn_flags & ISDOTDOT) || 755 (ip->i_flag & IN_RENAME)) { 756 VOP_UNLOCK(fvp, 0); 757 error = EINVAL; 758 goto abortit; 759 } 760 ip->i_flag |= IN_RENAME; 761 oldparent = dp->i_number; 762 doingdirectory++; 763 } 764 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 765 vrele(fdvp); 766 767 /* 768 * When the target exists, both the directory 769 * and target vnodes are returned locked. 770 */ 771 dp = VTOI(tdvp); 772 xp = NULL; 773 if (tvp) 774 xp = VTOI(tvp); 775 776 /* 777 * 1) Bump link count while we're moving stuff 778 * around. If we crash somewhere before 779 * completing our work, the link count 780 * may be wrong, but correctable. 781 */ 782 ip->i_e2fs_nlink++; 783 ip->i_flag |= IN_CHANGE; 784 if ((error = VOP_UPDATE(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 785 VOP_UNLOCK(fvp, 0); 786 goto bad; 787 } 788 789 /* 790 * If ".." must be changed (ie the directory gets a new 791 * parent) then the source directory must not be in the 792 * directory hierarchy above the target, as this would 793 * orphan everything below the source directory. Also 794 * the user must have write permission in the source so 795 * as to be able to change "..". We must repeat the call 796 * to namei, as the parent directory is unlocked by the 797 * call to checkpath(). 798 */ 799 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); 800 VOP_UNLOCK(fvp, 0); 801 if (oldparent != dp->i_number) 802 newparent = dp->i_number; 803 if (doingdirectory && newparent) { 804 if (error) /* write access check above */ 805 goto bad; 806 if (xp != NULL) 807 vput(tvp); 808 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 809 if (error != 0) 810 goto out; 811 if ((tcnp->cn_flags & SAVESTART) == 0) 812 panic("ext2fs_rename: lost to startdir"); 813 if ((error = relookup(tdvp, &tvp, tcnp)) != 0) 814 goto out; 815 dp = VTOI(tdvp); 816 xp = NULL; 817 if (tvp) 818 xp = VTOI(tvp); 819 } 820 /* 821 * 2) If target doesn't exist, link the target 822 * to the source and unlink the source. 823 * Otherwise, rewrite the target directory 824 * entry to reference the source inode and 825 * expunge the original entry's existence. 826 */ 827 if (xp == NULL) { 828 if (dp->i_dev != ip->i_dev) 829 panic("rename: EXDEV"); 830 /* 831 * Account for ".." in new directory. 832 * When source and destination have the same 833 * parent we don't fool with the link count. 834 */ 835 if (doingdirectory && newparent) { 836 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 837 error = EMLINK; 838 goto bad; 839 } 840 dp->i_e2fs_nlink++; 841 dp->i_flag |= IN_CHANGE; 842 if ((error = VOP_UPDATE(tdvp, NULL, NULL, UPDATE_WAIT)) 843 != 0) 844 goto bad; 845 } 846 error = ext2fs_direnter(ip, tdvp, tcnp); 847 if (error != 0) { 848 if (doingdirectory && newparent) { 849 dp->i_e2fs_nlink--; 850 dp->i_flag |= IN_CHANGE; 851 (void)VOP_UPDATE(tdvp, NULL, NULL, UPDATE_WAIT); 852 } 853 goto bad; 854 } 855 VN_KNOTE(tdvp, NOTE_WRITE); 856 vput(tdvp); 857 } else { 858 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 859 panic("rename: EXDEV"); 860 /* 861 * Short circuit rename(foo, foo). 862 */ 863 if (xp->i_number == ip->i_number) 864 panic("rename: same file"); 865 /* 866 * If the parent directory is "sticky", then the user must 867 * own the parent directory, or the destination of the rename, 868 * otherwise the destination may not be changed (except by 869 * root). This implements append-only directories. 870 */ 871 if ((dp->i_e2fs_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 872 tcnp->cn_cred->cr_uid != dp->i_e2fs_uid && 873 xp->i_e2fs_uid != tcnp->cn_cred->cr_uid) { 874 error = EPERM; 875 goto bad; 876 } 877 /* 878 * Target must be empty if a directory and have no links 879 * to it. Also, ensure source and target are compatible 880 * (both directories, or both not directories). 881 */ 882 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 883 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 884 xp->i_e2fs_nlink > 2) { 885 error = ENOTEMPTY; 886 goto bad; 887 } 888 if (!doingdirectory) { 889 error = ENOTDIR; 890 goto bad; 891 } 892 cache_purge(tdvp); 893 } else if (doingdirectory) { 894 error = EISDIR; 895 goto bad; 896 } 897 error = ext2fs_dirrewrite(dp, ip, tcnp); 898 if (error != 0) 899 goto bad; 900 /* 901 * If the target directory is in the same 902 * directory as the source directory, 903 * decrement the link count on the parent 904 * of the target directory. 905 */ 906 if (doingdirectory && !newparent) { 907 dp->i_e2fs_nlink--; 908 dp->i_flag |= IN_CHANGE; 909 } 910 VN_KNOTE(tdvp, NOTE_WRITE); 911 vput(tdvp); 912 /* 913 * Adjust the link count of the target to 914 * reflect the dirrewrite above. If this is 915 * a directory it is empty and there are 916 * no links to it, so we can squash the inode and 917 * any space associated with it. We disallowed 918 * renaming over top of a directory with links to 919 * it above, as the remaining link would point to 920 * a directory without "." or ".." entries. 921 */ 922 xp->i_e2fs_nlink--; 923 if (doingdirectory) { 924 if (--xp->i_e2fs_nlink != 0) 925 panic("rename: linked directory"); 926 error = VOP_TRUNCATE(tvp, (off_t)0, IO_SYNC, 927 tcnp->cn_cred, tcnp->cn_proc); 928 } 929 xp->i_flag |= IN_CHANGE; 930 VN_KNOTE(tvp, NOTE_DELETE); 931 vput(tvp); 932 xp = NULL; 933 } 934 935 /* 936 * 3) Unlink the source. 937 */ 938 fcnp->cn_flags &= ~MODMASK; 939 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 940 if ((fcnp->cn_flags & SAVESTART) == 0) 941 panic("ext2fs_rename: lost from startdir"); 942 (void) relookup(fdvp, &fvp, fcnp); 943 if (fvp != NULL) { 944 xp = VTOI(fvp); 945 dp = VTOI(fdvp); 946 } else { 947 /* 948 * From name has disappeared. 949 */ 950 if (doingdirectory) 951 panic("ext2fs_rename: lost dir entry"); 952 vrele(ap->a_fvp); 953 return (0); 954 } 955 /* 956 * Ensure that the directory entry still exists and has not 957 * changed while the new name has been entered. If the source is 958 * a file then the entry may have been unlinked or renamed. In 959 * either case there is no further work to be done. If the source 960 * is a directory then it cannot have been rmdir'ed; its link 961 * count of three would cause a rmdir to fail with ENOTEMPTY. 962 * The IRENAME flag ensures that it cannot be moved by another 963 * rename. 964 */ 965 if (xp != ip) { 966 if (doingdirectory) 967 panic("ext2fs_rename: lost dir entry"); 968 } else { 969 /* 970 * If the source is a directory with a 971 * new parent, the link count of the old 972 * parent directory must be decremented 973 * and ".." set to point to the new parent. 974 */ 975 if (doingdirectory && newparent) { 976 dp->i_e2fs_nlink--; 977 dp->i_flag |= IN_CHANGE; 978 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 979 sizeof (struct ext2fs_dirtemplate), (off_t)0, 980 UIO_SYSSPACE, IO_NODELOCKED, 981 tcnp->cn_cred, (size_t *)0, (struct proc *)0); 982 if (error == 0) { 983 namlen = dirbuf.dotdot_namlen; 984 if (namlen != 2 || 985 dirbuf.dotdot_name[0] != '.' || 986 dirbuf.dotdot_name[1] != '.') { 987 ufs_dirbad(xp, (doff_t)12, 988 "ext2fs_rename: mangled dir"); 989 } else { 990 dirbuf.dotdot_ino = h2fs32(newparent); 991 (void) vn_rdwr(UIO_WRITE, fvp, 992 (caddr_t)&dirbuf, 993 sizeof (struct dirtemplate), 994 (off_t)0, UIO_SYSSPACE, 995 IO_NODELOCKED|IO_SYNC, 996 tcnp->cn_cred, (size_t *)0, 997 (struct proc *)0); 998 cache_purge(fdvp); 999 } 1000 } 1001 } 1002 error = ext2fs_dirremove(fdvp, fcnp); 1003 if (!error) { 1004 xp->i_e2fs_nlink--; 1005 xp->i_flag |= IN_CHANGE; 1006 } 1007 xp->i_flag &= ~IN_RENAME; 1008 } 1009 VN_KNOTE(fvp, NOTE_RENAME); 1010 if (dp) 1011 vput(fdvp); 1012 if (xp) 1013 vput(fvp); 1014 vrele(ap->a_fvp); 1015 return (error); 1016 1017 bad: 1018 if (xp) 1019 vput(ITOV(xp)); 1020 vput(ITOV(dp)); 1021 out: 1022 if (doingdirectory) 1023 ip->i_flag &= ~IN_RENAME; 1024 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1025 ip->i_e2fs_nlink--; 1026 ip->i_flag |= IN_CHANGE; 1027 vput(fvp); 1028 } else 1029 vrele(fvp); 1030 return (error); 1031 } 1032 1033 /* 1034 * Mkdir system call 1035 */ 1036 int 1037 ext2fs_mkdir(v) 1038 void *v; 1039 { 1040 struct vop_mkdir_args /* { 1041 struct vnode *a_dvp; 1042 struct vnode **a_vpp; 1043 struct componentname *a_cnp; 1044 struct vattr *a_vap; 1045 } */ *ap = v; 1046 struct vnode *dvp = ap->a_dvp; 1047 struct vattr *vap = ap->a_vap; 1048 struct componentname *cnp = ap->a_cnp; 1049 struct inode *ip, *dp; 1050 struct vnode *tvp; 1051 struct ext2fs_dirtemplate dirtemplate; 1052 int error, dmode; 1053 1054 #ifdef DIAGNOSTIC 1055 if ((cnp->cn_flags & HASBUF) == 0) 1056 panic("ext2fs_mkdir: no name"); 1057 #endif 1058 dp = VTOI(dvp); 1059 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1060 error = EMLINK; 1061 goto out; 1062 } 1063 dmode = vap->va_mode & ACCESSPERMS; 1064 dmode |= IFDIR; 1065 /* 1066 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1067 * but not have it entered in the parent directory. The entry is 1068 * made later after writing "." and ".." entries. 1069 */ 1070 if ((error = VOP_VALLOC(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1071 goto out; 1072 ip = VTOI(tvp); 1073 ip->i_e2fs_uid = cnp->cn_cred->cr_uid; 1074 ip->i_e2fs_gid = dp->i_e2fs_gid; 1075 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1076 ip->i_e2fs_mode = dmode; 1077 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1078 ip->i_e2fs_nlink = 2; 1079 error = VOP_UPDATE(tvp, NULL, NULL, UPDATE_WAIT); 1080 1081 /* 1082 * Bump link count in parent directory 1083 * to reflect work done below. Should 1084 * be done before reference is created 1085 * so reparation is possible if we crash. 1086 */ 1087 dp->i_e2fs_nlink++; 1088 dp->i_flag |= IN_CHANGE; 1089 if ((error = VOP_UPDATE(dvp, NULL, NULL, UPDATE_WAIT)) != 0) 1090 goto bad; 1091 1092 /* Initialize directory with "." and ".." from static template. */ 1093 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1094 dirtemplate.dot_ino = h2fs32(ip->i_number); 1095 dirtemplate.dot_reclen = h2fs16(12); 1096 dirtemplate.dot_namlen = 1; 1097 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1098 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1099 dirtemplate.dot_type = EXT2_FT_DIR; 1100 } 1101 dirtemplate.dot_name[0] = '.'; 1102 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1103 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1104 dirtemplate.dotdot_namlen = 2; 1105 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1106 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1107 dirtemplate.dotdot_type = EXT2_FT_DIR; 1108 } 1109 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1110 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1111 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1112 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, (struct proc *)0); 1113 if (error) { 1114 dp->i_e2fs_nlink--; 1115 dp->i_flag |= IN_CHANGE; 1116 goto bad; 1117 } 1118 if (VTOI(dvp)->i_e2fs->e2fs_bsize > 1119 VFSTOUFS(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1120 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1121 else { 1122 ip->i_e2fs_size = VTOI(dvp)->i_e2fs->e2fs_bsize; 1123 ip->i_flag |= IN_CHANGE; 1124 } 1125 1126 /* Directory set up, now install it's entry in the parent directory. */ 1127 error = ext2fs_direnter(ip, dvp, cnp); 1128 if (error != 0) { 1129 dp->i_e2fs_nlink--; 1130 dp->i_flag |= IN_CHANGE; 1131 } 1132 bad: 1133 /* 1134 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1135 * for us because we set the link count to 0. 1136 */ 1137 if (error) { 1138 ip->i_e2fs_nlink = 0; 1139 ip->i_flag |= IN_CHANGE; 1140 vput(tvp); 1141 } else { 1142 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1143 *ap->a_vpp = tvp; 1144 } 1145 out: 1146 PNBUF_PUT(cnp->cn_pnbuf); 1147 vput(dvp); 1148 return (error); 1149 } 1150 1151 /* 1152 * Rmdir system call. 1153 */ 1154 int 1155 ext2fs_rmdir(v) 1156 void *v; 1157 { 1158 struct vop_rmdir_args /* { 1159 struct vnode *a_dvp; 1160 struct vnode *a_vp; 1161 struct componentname *a_cnp; 1162 } */ *ap = v; 1163 struct vnode *vp = ap->a_vp; 1164 struct vnode *dvp = ap->a_dvp; 1165 struct componentname *cnp = ap->a_cnp; 1166 struct inode *ip, *dp; 1167 int error; 1168 1169 ip = VTOI(vp); 1170 dp = VTOI(dvp); 1171 /* 1172 * No rmdir "." please. 1173 */ 1174 if (dp == ip) { 1175 vrele(dvp); 1176 vput(vp); 1177 return (EINVAL); 1178 } 1179 /* 1180 * Verify the directory is empty (and valid). 1181 * (Rmdir ".." won't be valid since 1182 * ".." will contain a reference to 1183 * the current directory and thus be 1184 * non-empty.) 1185 */ 1186 error = 0; 1187 if (ip->i_e2fs_nlink != 2 || 1188 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1189 error = ENOTEMPTY; 1190 goto out; 1191 } 1192 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1193 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1194 error = EPERM; 1195 goto out; 1196 } 1197 /* 1198 * Delete reference to directory before purging 1199 * inode. If we crash in between, the directory 1200 * will be reattached to lost+found, 1201 */ 1202 error = ext2fs_dirremove(dvp, cnp); 1203 if (error != 0) 1204 goto out; 1205 dp->i_e2fs_nlink--; 1206 dp->i_flag |= IN_CHANGE; 1207 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1208 cache_purge(dvp); 1209 vput(dvp); 1210 dvp = NULL; 1211 /* 1212 * Truncate inode. The only stuff left 1213 * in the directory is "." and "..". The 1214 * "." reference is inconsequential since 1215 * we're quashing it. The ".." reference 1216 * has already been adjusted above. We've 1217 * removed the "." reference and the reference 1218 * in the parent directory, but there may be 1219 * other hard links so decrement by 2 and 1220 * worry about them later. 1221 */ 1222 ip->i_e2fs_nlink -= 2; 1223 error = VOP_TRUNCATE(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1224 cnp->cn_proc); 1225 cache_purge(ITOV(ip)); 1226 out: 1227 VN_KNOTE(vp, NOTE_DELETE); 1228 if (dvp) 1229 vput(dvp); 1230 vput(vp); 1231 return (error); 1232 } 1233 1234 /* 1235 * symlink -- make a symbolic link 1236 */ 1237 int 1238 ext2fs_symlink(v) 1239 void *v; 1240 { 1241 struct vop_symlink_args /* { 1242 struct vnode *a_dvp; 1243 struct vnode **a_vpp; 1244 struct componentname *a_cnp; 1245 struct vattr *a_vap; 1246 char *a_target; 1247 } */ *ap = v; 1248 struct vnode *vp, **vpp = ap->a_vpp; 1249 struct inode *ip; 1250 int len, error; 1251 1252 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1253 vpp, ap->a_cnp); 1254 if (error) 1255 return (error); 1256 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1257 vp = *vpp; 1258 len = strlen(ap->a_target); 1259 if (len < vp->v_mount->mnt_maxsymlinklen) { 1260 ip = VTOI(vp); 1261 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1262 ip->i_e2fs_size = len; 1263 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1264 } else 1265 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1266 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1267 (size_t *)0, (struct proc *)0); 1268 if (error) 1269 vput(vp); 1270 return (error); 1271 } 1272 1273 /* 1274 * Return target name of a symbolic link 1275 */ 1276 int 1277 ext2fs_readlink(v) 1278 void *v; 1279 { 1280 struct vop_readlink_args /* { 1281 struct vnode *a_vp; 1282 struct uio *a_uio; 1283 struct ucred *a_cred; 1284 } */ *ap = v; 1285 struct vnode *vp = ap->a_vp; 1286 struct inode *ip = VTOI(vp); 1287 int isize; 1288 1289 isize = ip->i_e2fs_size; 1290 if (isize < vp->v_mount->mnt_maxsymlinklen || 1291 (vp->v_mount->mnt_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1292 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1293 return (0); 1294 } 1295 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1296 } 1297 1298 /* 1299 * Advisory record locking support 1300 */ 1301 int 1302 ext2fs_advlock(v) 1303 void *v; 1304 { 1305 struct vop_advlock_args /* { 1306 struct vnode *a_vp; 1307 caddr_t a_id; 1308 int a_op; 1309 struct flock *a_fl; 1310 int a_flags; 1311 } */ *ap = v; 1312 struct inode *ip = VTOI(ap->a_vp); 1313 1314 return lf_advlock(ap, &ip->i_lockf, ip->i_e2fs_size); 1315 } 1316 1317 /* 1318 * Initialize the vnode associated with a new inode, handle aliased 1319 * vnodes. 1320 */ 1321 int 1322 ext2fs_vinit(mntp, specops, fifoops, vpp) 1323 struct mount *mntp; 1324 int (**specops) __P((void *)); 1325 int (**fifoops) __P((void *)); 1326 struct vnode **vpp; 1327 { 1328 struct inode *ip; 1329 struct vnode *vp, *nvp; 1330 1331 vp = *vpp; 1332 ip = VTOI(vp); 1333 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1334 case VCHR: 1335 case VBLK: 1336 vp->v_op = specops; 1337 if ((nvp = checkalias(vp, 1338 fs2h32(ip->i_din.e2fs_din->e2di_rdev), mntp)) != NULL) { 1339 /* 1340 * Discard unneeded vnode, but save its inode. 1341 */ 1342 nvp->v_data = vp->v_data; 1343 vp->v_data = NULL; 1344 VOP_UNLOCK(vp, 0); 1345 vp->v_op = spec_vnodeop_p; 1346 vrele(vp); 1347 vgone(vp); 1348 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 1349 /* 1350 * Reinitialize aliased inode. 1351 */ 1352 vp = nvp; 1353 ip->i_vnode = vp; 1354 } 1355 break; 1356 case VFIFO: 1357 vp->v_op = fifoops; 1358 break; 1359 case VNON: 1360 case VBAD: 1361 case VSOCK: 1362 case VLNK: 1363 case VDIR: 1364 case VREG: 1365 break; 1366 } 1367 if (ip->i_number == ROOTINO) 1368 vp->v_flag |= VROOT; 1369 /* 1370 * Initialize modrev times 1371 */ 1372 SETHIGH(ip->i_modrev, mono_time.tv_sec); 1373 SETLOW(ip->i_modrev, mono_time.tv_usec * 4294); 1374 *vpp = vp; 1375 return (0); 1376 } 1377 1378 /* 1379 * Allocate a new inode. 1380 */ 1381 int 1382 ext2fs_makeinode(mode, dvp, vpp, cnp) 1383 int mode; 1384 struct vnode *dvp; 1385 struct vnode **vpp; 1386 struct componentname *cnp; 1387 { 1388 struct inode *ip, *pdir; 1389 struct vnode *tvp; 1390 int error; 1391 1392 pdir = VTOI(dvp); 1393 #ifdef DIAGNOSTIC 1394 if ((cnp->cn_flags & HASBUF) == 0) 1395 panic("ext2fs_makeinode: no name"); 1396 #endif 1397 *vpp = NULL; 1398 if ((mode & IFMT) == 0) 1399 mode |= IFREG; 1400 1401 if ((error = VOP_VALLOC(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1402 PNBUF_PUT(cnp->cn_pnbuf); 1403 vput(dvp); 1404 return (error); 1405 } 1406 ip = VTOI(tvp); 1407 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1408 ip->i_e2fs_uid = cnp->cn_cred->cr_uid; 1409 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1410 ip->i_e2fs_mode = mode; 1411 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1412 ip->i_e2fs_nlink = 1; 1413 if ((ip->i_e2fs_mode & ISGID) && 1414 !groupmember(ip->i_e2fs_gid, cnp->cn_cred) && 1415 suser(cnp->cn_cred, NULL)) 1416 ip->i_e2fs_mode &= ~ISGID; 1417 1418 /* 1419 * Make sure inode goes to disk before directory entry. 1420 */ 1421 if ((error = VOP_UPDATE(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1422 goto bad; 1423 error = ext2fs_direnter(ip, dvp, cnp); 1424 if (error != 0) 1425 goto bad; 1426 if ((cnp->cn_flags & SAVESTART) == 0) 1427 PNBUF_PUT(cnp->cn_pnbuf); 1428 vput(dvp); 1429 *vpp = tvp; 1430 return (0); 1431 1432 bad: 1433 /* 1434 * Write error occurred trying to update the inode 1435 * or the directory so must deallocate the inode. 1436 */ 1437 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1438 ip->i_e2fs_nlink = 0; 1439 ip->i_flag |= IN_CHANGE; 1440 vput(tvp); 1441 PNBUF_PUT(cnp->cn_pnbuf); 1442 vput(dvp); 1443 return (error); 1444 } 1445 1446 /* 1447 * Reclaim an inode so that it can be used for other purposes. 1448 */ 1449 int 1450 ext2fs_reclaim(v) 1451 void *v; 1452 { 1453 struct vop_reclaim_args /* { 1454 struct vnode *a_vp; 1455 } */ *ap = v; 1456 struct vnode *vp = ap->a_vp; 1457 struct inode *ip; 1458 1459 if (prtactive && vp->v_usecount != 0) 1460 vprint("ext2fs_reclaim: pushing active", vp); 1461 /* 1462 * Remove the inode from its hash chain. 1463 */ 1464 ip = VTOI(vp); 1465 ufs_ihashrem(ip); 1466 /* 1467 * Purge old data structures associated with the inode. 1468 */ 1469 cache_purge(vp); 1470 if (ip->i_devvp) { 1471 vrele(ip->i_devvp); 1472 ip->i_devvp = 0; 1473 } 1474 1475 if (ip->i_din.e2fs_din != NULL) 1476 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1477 1478 pool_put(&ext2fs_inode_pool, vp->v_data); 1479 vp->v_data = NULL; 1480 return (0); 1481 } 1482 1483 /* Global vfs data structures for ext2fs. */ 1484 int (**ext2fs_vnodeop_p) __P((void *)); 1485 const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1486 { &vop_default_desc, vn_default_error }, 1487 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1488 { &vop_create_desc, ext2fs_create }, /* create */ 1489 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1490 { &vop_open_desc, ext2fs_open }, /* open */ 1491 { &vop_close_desc, ufs_close }, /* close */ 1492 { &vop_access_desc, ext2fs_access }, /* access */ 1493 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1494 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1495 { &vop_read_desc, ext2fs_read }, /* read */ 1496 { &vop_write_desc, ext2fs_write }, /* write */ 1497 { &vop_lease_desc, ufs_lease_check }, /* lease */ 1498 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1499 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1500 { &vop_poll_desc, ufs_poll }, /* poll */ 1501 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1502 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1503 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1504 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1505 { &vop_seek_desc, ufs_seek }, /* seek */ 1506 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1507 { &vop_link_desc, ext2fs_link }, /* link */ 1508 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1509 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1510 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1511 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1512 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1513 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1514 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1515 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1516 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1517 { &vop_lock_desc, ufs_lock }, /* lock */ 1518 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1519 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1520 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1521 { &vop_print_desc, ufs_print }, /* print */ 1522 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1523 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1524 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1525 { &vop_blkatoff_desc, ext2fs_blkatoff }, /* blkatoff */ 1526 { &vop_valloc_desc, ext2fs_valloc }, /* valloc */ 1527 { &vop_vfree_desc, ext2fs_vfree }, /* vfree */ 1528 { &vop_truncate_desc, ext2fs_truncate }, /* truncate */ 1529 { &vop_update_desc, ext2fs_update }, /* update */ 1530 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1531 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1532 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1533 { NULL, NULL } 1534 }; 1535 const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1536 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1537 1538 int (**ext2fs_specop_p) __P((void *)); 1539 const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1540 { &vop_default_desc, vn_default_error }, 1541 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1542 { &vop_create_desc, spec_create }, /* create */ 1543 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1544 { &vop_open_desc, spec_open }, /* open */ 1545 { &vop_close_desc, ufsspec_close }, /* close */ 1546 { &vop_access_desc, ext2fs_access }, /* access */ 1547 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1548 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1549 { &vop_read_desc, ufsspec_read }, /* read */ 1550 { &vop_write_desc, ufsspec_write }, /* write */ 1551 { &vop_lease_desc, spec_lease_check }, /* lease */ 1552 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1553 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1554 { &vop_poll_desc, spec_poll }, /* poll */ 1555 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1556 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1557 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1558 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1559 { &vop_seek_desc, spec_seek }, /* seek */ 1560 { &vop_remove_desc, spec_remove }, /* remove */ 1561 { &vop_link_desc, spec_link }, /* link */ 1562 { &vop_rename_desc, spec_rename }, /* rename */ 1563 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1564 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1565 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1566 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1567 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1568 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1569 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1570 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1571 { &vop_lock_desc, ufs_lock }, /* lock */ 1572 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1573 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1574 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1575 { &vop_print_desc, ufs_print }, /* print */ 1576 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1577 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1578 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1579 { &vop_blkatoff_desc, spec_blkatoff }, /* blkatoff */ 1580 { &vop_valloc_desc, spec_valloc }, /* valloc */ 1581 { &vop_vfree_desc, ext2fs_vfree }, /* vfree */ 1582 { &vop_truncate_desc, spec_truncate }, /* truncate */ 1583 { &vop_update_desc, ext2fs_update }, /* update */ 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) __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_blkatoff_desc, fifo_blkatoff }, /* blkatoff */ 1634 { &vop_valloc_desc, fifo_valloc }, /* valloc */ 1635 { &vop_vfree_desc, ext2fs_vfree }, /* vfree */ 1636 { &vop_truncate_desc, fifo_truncate }, /* truncate */ 1637 { &vop_update_desc, ext2fs_update }, /* update */ 1638 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1639 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 1640 { NULL, NULL } 1641 }; 1642 const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1643 { &ext2fs_fifoop_p, ext2fs_fifoop_entries }; 1644
Indexes created Sat Sep 27 14:09:57 GMT 2025