/sys/ufs/ext2fs/ext2fs_vnops.c
C | 1664 lines | 1180 code | 93 blank | 391 comment | 279 complexity | 0971aa255f7c3e5ad9b47cafa714848c MD5 | raw file
1/* $NetBSD: ext2fs_vnops.c,v 1.101 2011/11/18 21:18:51 christos Exp $ */ 2 3/* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94 37 * Modified for ext2fs by Manuel Bouyer. 38 */ 39 40/* 41 * Copyright (c) 1997 Manuel Bouyer. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 * 63 * @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94 64 * Modified for ext2fs by Manuel Bouyer. 65 */ 66 67#include <sys/cdefs.h> 68__KERNEL_RCSID(0, "$NetBSD: ext2fs_vnops.c,v 1.101 2011/11/18 21:18:51 christos Exp $"); 69 70#include <sys/param.h> 71#include <sys/systm.h> 72#include <sys/resourcevar.h> 73#include <sys/kernel.h> 74#include <sys/file.h> 75#include <sys/stat.h> 76#include <sys/buf.h> 77#include <sys/proc.h> 78#include <sys/mount.h> 79#include <sys/namei.h> 80#include <sys/vnode.h> 81#include <sys/lockf.h> 82#include <sys/malloc.h> 83#include <sys/pool.h> 84#include <sys/signalvar.h> 85#include <sys/kauth.h> 86 87#include <miscfs/fifofs/fifo.h> 88#include <miscfs/genfs/genfs.h> 89#include <miscfs/specfs/specdev.h> 90 91#include <ufs/ufs/inode.h> 92#include <ufs/ufs/ufs_extern.h> 93#include <ufs/ufs/ufsmount.h> 94 95#include <ufs/ext2fs/ext2fs.h> 96#include <ufs/ext2fs/ext2fs_extern.h> 97#include <ufs/ext2fs/ext2fs_dir.h> 98 99extern int prtactive; 100 101static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *); 102static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 103 struct lwp *); 104 105union _qcvt { 106 int64_t qcvt; 107 int32_t val[2]; 108}; 109 110#define SETHIGH(q, h) { \ 111 union _qcvt tmp; \ 112 tmp.qcvt = (q); \ 113 tmp.val[_QUAD_HIGHWORD] = (h); \ 114 (q) = tmp.qcvt; \ 115} 116#define SETLOW(q, l) { \ 117 union _qcvt tmp; \ 118 tmp.qcvt = (q); \ 119 tmp.val[_QUAD_LOWWORD] = (l); \ 120 (q) = tmp.qcvt; \ 121} 122 123/* 124 * Create a regular file 125 */ 126int 127ext2fs_create(void *v) 128{ 129 struct vop_create_args /* { 130 struct vnode *a_dvp; 131 struct vnode **a_vpp; 132 struct componentname *a_cnp; 133 struct vattr *a_vap; 134 } */ *ap = v; 135 int error; 136 137 error = 138 ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 139 ap->a_dvp, ap->a_vpp, ap->a_cnp); 140 141 if (error) 142 return (error); 143 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 144 return (0); 145} 146 147/* 148 * Mknod vnode call 149 */ 150/* ARGSUSED */ 151int 152ext2fs_mknod(void *v) 153{ 154 struct vop_mknod_args /* { 155 struct vnode *a_dvp; 156 struct vnode **a_vpp; 157 struct componentname *a_cnp; 158 struct vattr *a_vap; 159 } */ *ap = v; 160 struct vattr *vap = ap->a_vap; 161 struct vnode **vpp = ap->a_vpp; 162 struct inode *ip; 163 int error; 164 struct mount *mp; 165 ino_t ino; 166 167 if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 168 ap->a_dvp, vpp, ap->a_cnp)) != 0) 169 return (error); 170 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 171 ip = VTOI(*vpp); 172 mp = (*vpp)->v_mount; 173 ino = ip->i_number; 174 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 175 if (vap->va_rdev != VNOVAL) { 176 /* 177 * Want to be able to use this to make badblock 178 * inodes, so don't truncate the dev number. 179 */ 180 ip->i_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev); 181 } 182 /* 183 * Remove inode so that it will be reloaded by VFS_VGET and 184 * checked to see if it is an alias of an existing entry in 185 * the inode cache. 186 */ 187 VOP_UNLOCK(*vpp); 188 (*vpp)->v_type = VNON; 189 vgone(*vpp); 190 error = VFS_VGET(mp, ino, vpp); 191 if (error != 0) { 192 *vpp = NULL; 193 return (error); 194 } 195 return (0); 196} 197 198/* 199 * Open called. 200 * 201 * Just check the APPEND flag. 202 */ 203/* ARGSUSED */ 204int 205ext2fs_open(void *v) 206{ 207 struct vop_open_args /* { 208 struct vnode *a_vp; 209 int a_mode; 210 kauth_cred_t a_cred; 211 } */ *ap = v; 212 213 /* 214 * Files marked append-only must be opened for appending. 215 */ 216 if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) && 217 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 218 return (EPERM); 219 return (0); 220} 221 222static int 223ext2fs_check_possible(struct vnode *vp, struct inode *ip, mode_t mode) 224{ 225 226 /* 227 * Disallow write attempts on read-only file systems; 228 * unless the file is a socket, fifo, or a block or 229 * character device resident on the file system. 230 */ 231 if (mode & VWRITE) { 232 switch (vp->v_type) { 233 case VDIR: 234 case VLNK: 235 case VREG: 236 if (vp->v_mount->mnt_flag & MNT_RDONLY) 237 return (EROFS); 238 break; 239 default: 240 break; 241 } 242 } 243 244 /* If immutable bit set, nobody gets to write it. */ 245 if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE)) 246 return (EPERM); 247 248 return 0; 249} 250 251static int 252ext2fs_check_permitted(struct vnode *vp, struct inode *ip, mode_t mode, 253 kauth_cred_t cred) 254{ 255 256 return genfs_can_access(vp->v_type, ip->i_e2fs_mode & ALLPERMS, 257 ip->i_uid, ip->i_gid, mode, cred); 258} 259 260int 261ext2fs_access(void *v) 262{ 263 struct vop_access_args /* { 264 struct vnode *a_vp; 265 int a_mode; 266 kauth_cred_t a_cred; 267 } */ *ap = v; 268 struct vnode *vp = ap->a_vp; 269 struct inode *ip = VTOI(vp); 270 mode_t mode = ap->a_mode; 271 int error; 272 273 error = ext2fs_check_possible(vp, ip, mode); 274 if (error) 275 return error; 276 277 error = ext2fs_check_permitted(vp, ip, mode, ap->a_cred); 278 279 return error; 280} 281 282/* ARGSUSED */ 283int 284ext2fs_getattr(void *v) 285{ 286 struct vop_getattr_args /* { 287 struct vnode *a_vp; 288 struct vattr *a_vap; 289 kauth_cred_t a_cred; 290 } */ *ap = v; 291 struct vnode *vp = ap->a_vp; 292 struct inode *ip = VTOI(vp); 293 struct vattr *vap = ap->a_vap; 294 295 EXT2FS_ITIMES(ip, NULL, NULL, NULL); 296 /* 297 * Copy from inode table 298 */ 299 vap->va_fsid = ip->i_dev; 300 vap->va_fileid = ip->i_number; 301 vap->va_mode = ip->i_e2fs_mode & ALLPERMS; 302 vap->va_nlink = ip->i_e2fs_nlink; 303 vap->va_uid = ip->i_uid; 304 vap->va_gid = ip->i_gid; 305 vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev); 306 vap->va_size = vp->v_size; 307 vap->va_atime.tv_sec = ip->i_e2fs_atime; 308 vap->va_atime.tv_nsec = 0; 309 vap->va_mtime.tv_sec = ip->i_e2fs_mtime; 310 vap->va_mtime.tv_nsec = 0; 311 vap->va_ctime.tv_sec = ip->i_e2fs_ctime; 312 vap->va_ctime.tv_nsec = 0; 313#ifdef EXT2FS_SYSTEM_FLAGS 314 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0; 315 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 316#else 317 vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0; 318 vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0; 319#endif 320 vap->va_gen = ip->i_e2fs_gen; 321 /* this doesn't belong here */ 322 if (vp->v_type == VBLK) 323 vap->va_blocksize = BLKDEV_IOSIZE; 324 else if (vp->v_type == VCHR) 325 vap->va_blocksize = MAXBSIZE; 326 else 327 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 328 vap->va_bytes = dbtob((u_quad_t)ip->i_e2fs_nblock); 329 vap->va_type = vp->v_type; 330 vap->va_filerev = ip->i_modrev; 331 return (0); 332} 333 334/* 335 * Set attribute vnode op. called from several syscalls 336 */ 337int 338ext2fs_setattr(void *v) 339{ 340 struct vop_setattr_args /* { 341 struct vnode *a_vp; 342 struct vattr *a_vap; 343 kauth_cred_t a_cred; 344 } */ *ap = v; 345 struct vattr *vap = ap->a_vap; 346 struct vnode *vp = ap->a_vp; 347 struct inode *ip = VTOI(vp); 348 kauth_cred_t cred = ap->a_cred; 349 struct lwp *l = curlwp; 350 int error; 351 352 /* 353 * Check for unsettable attributes. 354 */ 355 if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) || 356 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 357 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 358 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 359 return (EINVAL); 360 } 361 if (vap->va_flags != VNOVAL) { 362 if (vp->v_mount->mnt_flag & MNT_RDONLY) 363 return (EROFS); 364 if (kauth_cred_geteuid(cred) != ip->i_uid && 365 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 366 NULL))) 367 return (error); 368#ifdef EXT2FS_SYSTEM_FLAGS 369 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 370 NULL) == 0) { 371 if ((ip->i_e2fs_flags & 372 (EXT2_APPEND | EXT2_IMMUTABLE)) && 373 kauth_authorize_system(l->l_cred, 374 KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL)) 375 return (EPERM); 376 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 377 ip->i_e2fs_flags |= 378 (vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 | 379 (vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 380 } else 381 return (EPERM); 382#else 383 ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE); 384 ip->i_e2fs_flags |= 385 (vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 | 386 (vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 387#endif 388 ip->i_flag |= IN_CHANGE; 389 if (vap->va_flags & (IMMUTABLE | APPEND)) 390 return (0); 391 } 392 if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) 393 return (EPERM); 394 /* 395 * Go through the fields and update iff not VNOVAL. 396 */ 397 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 398 if (vp->v_mount->mnt_flag & MNT_RDONLY) 399 return (EROFS); 400 error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 401 if (error) 402 return (error); 403 } 404 if (vap->va_size != VNOVAL) { 405 /* 406 * Disallow write attempts on read-only file systems; 407 * unless the file is a socket, fifo, or a block or 408 * character device resident on the file system. 409 */ 410 switch (vp->v_type) { 411 case VDIR: 412 return (EISDIR); 413 case VLNK: 414 case VREG: 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return (EROFS); 417 default: 418 break; 419 } 420 error = ext2fs_truncate(vp, vap->va_size, 0, cred); 421 if (error) 422 return (error); 423 } 424 ip = VTOI(vp); 425 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 426 if (vp->v_mount->mnt_flag & MNT_RDONLY) 427 return (EROFS); 428 error = genfs_can_chtimes(vp, vap->va_vaflags, ip->i_uid, cred); 429 if (error) 430 return (error); 431 if (vap->va_atime.tv_sec != VNOVAL) 432 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 433 ip->i_flag |= IN_ACCESS; 434 if (vap->va_mtime.tv_sec != VNOVAL) { 435 ip->i_flag |= IN_CHANGE | IN_UPDATE; 436 if (vp->v_mount->mnt_flag & MNT_RELATIME) 437 ip->i_flag |= IN_ACCESS; 438 } 439 error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime, 440 UPDATE_WAIT); 441 if (error) 442 return (error); 443 } 444 error = 0; 445 if (vap->va_mode != (mode_t)VNOVAL) { 446 if (vp->v_mount->mnt_flag & MNT_RDONLY) 447 return (EROFS); 448 error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l); 449 } 450 VN_KNOTE(vp, NOTE_ATTRIB); 451 return (error); 452} 453 454/* 455 * Change the mode on a file. 456 * Inode must be locked before calling. 457 */ 458static int 459ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l) 460{ 461 struct inode *ip = VTOI(vp); 462 int error; 463 464 error = genfs_can_chmod(vp, cred, ip->i_uid, ip->i_gid, mode); 465 if (error) 466 return (error); 467 468 ip->i_e2fs_mode &= ~ALLPERMS; 469 ip->i_e2fs_mode |= (mode & ALLPERMS); 470 ip->i_flag |= IN_CHANGE; 471 return (0); 472} 473 474/* 475 * Perform chown operation on inode ip; 476 * inode must be locked prior to call. 477 */ 478static int 479ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 480 struct lwp *l) 481{ 482 struct inode *ip = VTOI(vp); 483 uid_t ouid; 484 gid_t ogid; 485 int error; 486 487 if (uid == (uid_t)VNOVAL) 488 uid = ip->i_uid; 489 if (gid == (gid_t)VNOVAL) 490 gid = ip->i_gid; 491 492 error = genfs_can_chown(vp, cred, ip->i_uid, ip->i_gid, uid, gid); 493 if (error) 494 return (error); 495 496 ogid = ip->i_gid; 497 ouid = ip->i_uid; 498 499 ip->i_e2fs_gid = gid & 0xffff; 500 ip->i_e2fs_uid = uid & 0xffff; 501 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 502 ip->i_e2fs_gid_high = (gid >> 16) & 0xffff; 503 ip->i_e2fs_uid_high = (uid >> 16) & 0xffff; 504 } else { 505 ip->i_e2fs_gid_high = 0; 506 ip->i_e2fs_uid_high = 0; 507 } 508 if (ouid != uid || ogid != gid) { 509 ext2fs_set_inode_guid(ip); 510 ip->i_flag |= IN_CHANGE; 511 } 512 if (ouid != uid && kauth_authorize_generic(cred, 513 KAUTH_GENERIC_ISSUSER, NULL) != 0) 514 ip->i_e2fs_mode &= ~ISUID; 515 if (ogid != gid && kauth_authorize_generic(cred, 516 KAUTH_GENERIC_ISSUSER, NULL) != 0) 517 ip->i_e2fs_mode &= ~ISGID; 518 return (0); 519} 520 521int 522ext2fs_remove(void *v) 523{ 524 struct vop_remove_args /* { 525 struct vnode *a_dvp; 526 struct vnode *a_vp; 527 struct componentname *a_cnp; 528 } */ *ap = v; 529 struct inode *ip; 530 struct vnode *vp = ap->a_vp; 531 struct vnode *dvp = ap->a_dvp; 532 struct ufs_lookup_results *ulr; 533 int error; 534 535 /* XXX should handle this material another way */ 536 ulr = &VTOI(dvp)->i_crap; 537 UFS_CHECK_CRAPCOUNTER(VTOI(dvp)); 538 539 ip = VTOI(vp); 540 if (vp->v_type == VDIR || 541 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 542 (VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) { 543 error = EPERM; 544 } else { 545 error = ext2fs_dirremove(dvp, ulr, ap->a_cnp); 546 if (error == 0) { 547 ip->i_e2fs_nlink--; 548 ip->i_flag |= IN_CHANGE; 549 } 550 } 551 552 VN_KNOTE(vp, NOTE_DELETE); 553 VN_KNOTE(dvp, NOTE_WRITE); 554 if (dvp == vp) 555 vrele(vp); 556 else 557 vput(vp); 558 vput(dvp); 559 return (error); 560} 561 562/* 563 * ext2fs_link: create hard link. 564 */ 565int 566ext2fs_link(void *v) 567{ 568 struct vop_link_args /* { 569 struct vnode *a_dvp; 570 struct vnode *a_vp; 571 struct componentname *a_cnp; 572 } */ *ap = v; 573 struct vnode *dvp = ap->a_dvp; 574 struct vnode *vp = ap->a_vp; 575 struct componentname *cnp = ap->a_cnp; 576 struct inode *ip; 577 int error; 578 struct ufs_lookup_results *ulr; 579 580 KASSERT(dvp != vp); 581 KASSERT(vp->v_type != VDIR); 582 KASSERT(dvp->v_mount == vp->v_mount); 583 584 /* XXX should handle this material another way */ 585 ulr = &VTOI(dvp)->i_crap; 586 UFS_CHECK_CRAPCOUNTER(VTOI(dvp)); 587 588 error = vn_lock(vp, LK_EXCLUSIVE); 589 if (error) { 590 VOP_ABORTOP(dvp, cnp); 591 goto out2; 592 } 593 ip = VTOI(vp); 594 if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) { 595 VOP_ABORTOP(dvp, cnp); 596 error = EMLINK; 597 goto out1; 598 } 599 if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) { 600 VOP_ABORTOP(dvp, cnp); 601 error = EPERM; 602 goto out1; 603 } 604 ip->i_e2fs_nlink++; 605 ip->i_flag |= IN_CHANGE; 606 error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT); 607 if (!error) 608 error = ext2fs_direnter(ip, dvp, ulr, cnp); 609 if (error) { 610 ip->i_e2fs_nlink--; 611 ip->i_flag |= IN_CHANGE; 612 } 613out1: 614 VOP_UNLOCK(vp); 615out2: 616 VN_KNOTE(vp, NOTE_LINK); 617 VN_KNOTE(dvp, NOTE_WRITE); 618 vput(dvp); 619 return (error); 620} 621 622/* 623 * Rename system call. 624 * rename("foo", "bar"); 625 * is essentially 626 * unlink("bar"); 627 * link("foo", "bar"); 628 * unlink("foo"); 629 * but ``atomically''. Can't do full commit without saving state in the 630 * inode on disk which isn't feasible at this time. Best we can do is 631 * always guarantee the target exists. 632 * 633 * Basic algorithm is: 634 * 635 * 1) Bump link count on source while we're linking it to the 636 * target. This also ensure the inode won't be deleted out 637 * from underneath us while we work (it may be truncated by 638 * a concurrent `trunc' or `open' for creation). 639 * 2) Link source to destination. If destination already exists, 640 * delete it first. 641 * 3) Unlink source reference to inode if still around. If a 642 * directory was moved and the parent of the destination 643 * is different from the source, patch the ".." entry in the 644 * directory. 645 */ 646int 647ext2fs_rename(void *v) 648{ 649 struct vop_rename_args /* { 650 struct vnode *a_fdvp; 651 struct vnode *a_fvp; 652 struct componentname *a_fcnp; 653 struct vnode *a_tdvp; 654 struct vnode *a_tvp; 655 struct componentname *a_tcnp; 656 } */ *ap = v; 657 struct vnode *tvp = ap->a_tvp; 658 struct vnode *tdvp = ap->a_tdvp; 659 struct vnode *fvp = ap->a_fvp; 660 struct vnode *fdvp = ap->a_fdvp; 661 struct componentname *tcnp = ap->a_tcnp; 662 struct componentname *fcnp = ap->a_fcnp; 663 struct inode *ip, *xp, *dp; 664 struct ext2fs_dirtemplate dirbuf; 665 int doingdirectory = 0, oldparent = 0, newparent = 0; 666 int error = 0; 667 u_char namlen; 668 669 /* 670 * Check for cross-device rename. 671 */ 672 if ((fvp->v_mount != tdvp->v_mount) || 673 (tvp && (fvp->v_mount != tvp->v_mount))) { 674 error = EXDEV; 675abortit: 676 VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ 677 if (tdvp == tvp) 678 vrele(tdvp); 679 else 680 vput(tdvp); 681 if (tvp) 682 vput(tvp); 683 VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ 684 vrele(fdvp); 685 vrele(fvp); 686 return (error); 687 } 688 689 /* 690 * Check if just deleting a link name. 691 */ 692 if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 693 (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) { 694 error = EPERM; 695 goto abortit; 696 } 697 if (fvp == tvp) { 698 if (fvp->v_type == VDIR) { 699 error = EINVAL; 700 goto abortit; 701 } 702 703 /* Release destination completely. */ 704 VOP_ABORTOP(tdvp, tcnp); 705 vput(tdvp); 706 vput(tvp); 707 708 /* Delete source. */ 709 vrele(fvp); 710 fcnp->cn_flags &= ~(MODMASK); 711 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 712 fcnp->cn_nameiop = DELETE; 713 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 714 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 715 vput(fdvp); 716 return (error); 717 } 718 return (VOP_REMOVE(fdvp, fvp, fcnp)); 719 } 720 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 721 goto abortit; 722 dp = VTOI(fdvp); 723 ip = VTOI(fvp); 724 if ((nlink_t) ip->i_e2fs_nlink >= LINK_MAX) { 725 VOP_UNLOCK(fvp); 726 error = EMLINK; 727 goto abortit; 728 } 729 if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) || 730 (dp->i_e2fs_flags & EXT2_APPEND)) { 731 VOP_UNLOCK(fvp); 732 error = EPERM; 733 goto abortit; 734 } 735 if ((ip->i_e2fs_mode & IFMT) == IFDIR) { 736 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 737 if (!error && tvp) 738 error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred); 739 if (error) { 740 VOP_UNLOCK(fvp); 741 error = EACCES; 742 goto abortit; 743 } 744 /* 745 * Avoid ".", "..", and aliases of "." for obvious reasons. 746 */ 747 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 748 dp == ip || 749 (fcnp->cn_flags & ISDOTDOT) || 750 (tcnp->cn_flags & ISDOTDOT) || 751 (ip->i_flag & IN_RENAME)) { 752 VOP_UNLOCK(fvp); 753 error = EINVAL; 754 goto abortit; 755 } 756 ip->i_flag |= IN_RENAME; 757 oldparent = dp->i_number; 758 doingdirectory = 1; 759 } 760 VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */ 761 762 /* 763 * When the target exists, both the directory 764 * and target vnodes are returned locked. 765 */ 766 dp = VTOI(tdvp); 767 xp = NULL; 768 if (tvp) 769 xp = VTOI(tvp); 770 771 /* 772 * 1) Bump link count while we're moving stuff 773 * around. If we crash somewhere before 774 * completing our work, the link count 775 * may be wrong, but correctable. 776 */ 777 ip->i_e2fs_nlink++; 778 ip->i_flag |= IN_CHANGE; 779 if ((error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT)) != 0) { 780 VOP_UNLOCK(fvp); 781 goto bad; 782 } 783 784 /* 785 * If ".." must be changed (ie the directory gets a new 786 * parent) then the source directory must not be in the 787 * directory hierarchy above the target, as this would 788 * orphan everything below the source directory. Also 789 * the user must have write permission in the source so 790 * as to be able to change "..". We must repeat the call 791 * to namei, as the parent directory is unlocked by the 792 * call to checkpath(). 793 */ 794 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred); 795 VOP_UNLOCK(fvp); 796 if (oldparent != dp->i_number) 797 newparent = dp->i_number; 798 if (doingdirectory && newparent) { 799 if (error) /* write access check above */ 800 goto bad; 801 if (xp != NULL) 802 vput(tvp); 803 vref(tdvp); /* compensate for the ref checkpath loses */ 804 error = ext2fs_checkpath(ip, dp, tcnp->cn_cred); 805 if (error != 0) { 806 vrele(tdvp); 807 goto out; 808 } 809 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY); 810 if ((error = relookup(tdvp, &tvp, tcnp, 0)) != 0) { 811 vput(tdvp); 812 goto out; 813 } 814 dp = VTOI(tdvp); 815 xp = NULL; 816 if (tvp) 817 xp = VTOI(tvp); 818 } 819 /* 820 * 2) If target doesn't exist, link the target 821 * to the source and unlink the source. 822 * Otherwise, rewrite the target directory 823 * entry to reference the source inode and 824 * expunge the original entry's existence. 825 */ 826 if (xp == NULL) { 827 if (dp->i_dev != ip->i_dev) 828 panic("rename: EXDEV"); 829 /* 830 * Account for ".." in new directory. 831 * When source and destination have the same 832 * parent we don't fool with the link count. 833 */ 834 if (doingdirectory && newparent) { 835 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 836 error = EMLINK; 837 goto bad; 838 } 839 dp->i_e2fs_nlink++; 840 dp->i_flag |= IN_CHANGE; 841 if ((error = ext2fs_update(tdvp, NULL, NULL, 842 UPDATE_WAIT)) != 0) 843 goto bad; 844 } 845 error = ext2fs_direnter(ip, tdvp, &VTOI(tdvp)->i_crap, tcnp); 846 if (error != 0) { 847 if (doingdirectory && newparent) { 848 dp->i_e2fs_nlink--; 849 dp->i_flag |= IN_CHANGE; 850 (void)ext2fs_update(tdvp, NULL, NULL, 851 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) && 872 kauth_authorize_generic(tcnp->cn_cred, 873 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 874 kauth_cred_geteuid(tcnp->cn_cred) != dp->i_uid && 875 xp->i_uid != kauth_cred_geteuid(tcnp->cn_cred)) { 876 error = EPERM; 877 goto bad; 878 } 879 /* 880 * Target must be empty if a directory and have no links 881 * to it. Also, ensure source and target are compatible 882 * (both directories, or both not directories). 883 */ 884 if ((xp->i_e2fs_mode & IFMT) == IFDIR) { 885 if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) || 886 xp->i_e2fs_nlink > 2) { 887 error = ENOTEMPTY; 888 goto bad; 889 } 890 if (!doingdirectory) { 891 error = ENOTDIR; 892 goto bad; 893 } 894 cache_purge(tdvp); 895 } else if (doingdirectory) { 896 error = EISDIR; 897 goto bad; 898 } 899 error = ext2fs_dirrewrite(dp, &dp->i_crap, ip, tcnp); 900 if (error != 0) 901 goto bad; 902 /* 903 * If the target directory is in the same 904 * directory as the source directory, 905 * decrement the link count on the parent 906 * of the target directory. 907 */ 908 if (doingdirectory && !newparent) { 909 dp->i_e2fs_nlink--; 910 dp->i_flag |= IN_CHANGE; 911 } 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 = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, 927 tcnp->cn_cred); 928 } 929 xp->i_flag |= IN_CHANGE; 930 VN_KNOTE(tdvp, NOTE_WRITE); 931 vput(tdvp); 932 VN_KNOTE(tvp, NOTE_DELETE); 933 vput(tvp); 934 xp = NULL; 935 } 936 937 /* 938 * 3) Unlink the source. 939 */ 940 fcnp->cn_flags &= ~(MODMASK); 941 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 942 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 943 if ((error = relookup(fdvp, &fvp, fcnp, 0))) { 944 vput(fdvp); 945 vrele(ap->a_fvp); 946 return (error); 947 } 948 if (fvp != NULL) { 949 xp = VTOI(fvp); 950 dp = VTOI(fdvp); 951 } else { 952 /* 953 * From name has disappeared. 954 */ 955 if (doingdirectory) 956 panic("ext2fs_rename: lost dir entry"); 957 vrele(ap->a_fvp); 958 return (0); 959 } 960 /* 961 * Ensure that the directory entry still exists and has not 962 * changed while the new name has been entered. If the source is 963 * a file then the entry may have been unlinked or renamed. In 964 * either case there is no further work to be done. If the source 965 * is a directory then it cannot have been rmdir'ed; its link 966 * count of three would cause a rmdir to fail with ENOTEMPTY. 967 * The IRENAME flag ensures that it cannot be moved by another 968 * rename. 969 */ 970 if (xp != ip) { 971 if (doingdirectory) 972 panic("ext2fs_rename: lost dir entry"); 973 } else { 974 /* 975 * If the source is a directory with a 976 * new parent, the link count of the old 977 * parent directory must be decremented 978 * and ".." set to point to the new parent. 979 */ 980 if (doingdirectory && newparent) { 981 KASSERT(dp != NULL); 982 dp->i_e2fs_nlink--; 983 dp->i_flag |= IN_CHANGE; 984 error = vn_rdwr(UIO_READ, fvp, (void *)&dirbuf, 985 sizeof (struct ext2fs_dirtemplate), (off_t)0, 986 UIO_SYSSPACE, IO_NODELOCKED, 987 tcnp->cn_cred, (size_t *)0, NULL); 988 if (error == 0) { 989 namlen = dirbuf.dotdot_namlen; 990 if (namlen != 2 || 991 dirbuf.dotdot_name[0] != '.' || 992 dirbuf.dotdot_name[1] != '.') { 993 ufs_dirbad(xp, (doff_t)12, 994 "ext2fs_rename: mangled dir"); 995 } else { 996 dirbuf.dotdot_ino = h2fs32(newparent); 997 (void) vn_rdwr(UIO_WRITE, fvp, 998 (void *)&dirbuf, 999 sizeof (struct dirtemplate), 1000 (off_t)0, UIO_SYSSPACE, 1001 IO_NODELOCKED|IO_SYNC, 1002 tcnp->cn_cred, (size_t *)0, 1003 NULL); 1004 cache_purge(fdvp); 1005 } 1006 } 1007 } 1008 error = ext2fs_dirremove(fdvp, &VTOI(fdvp)->i_crap, fcnp); 1009 if (!error) { 1010 xp->i_e2fs_nlink--; 1011 xp->i_flag |= IN_CHANGE; 1012 } 1013 xp->i_flag &= ~IN_RENAME; 1014 } 1015 VN_KNOTE(fvp, NOTE_RENAME); 1016 if (dp) 1017 vput(fdvp); 1018 if (xp) 1019 vput(fvp); 1020 vrele(ap->a_fvp); 1021 return (error); 1022 1023bad: 1024 if (xp) 1025 vput(ITOV(xp)); 1026 vput(ITOV(dp)); 1027out: 1028 if (doingdirectory) 1029 ip->i_flag &= ~IN_RENAME; 1030 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1031 ip->i_e2fs_nlink--; 1032 ip->i_flag |= IN_CHANGE; 1033 vput(fvp); 1034 } else 1035 vrele(fvp); 1036 vrele(fdvp); 1037 return (error); 1038} 1039 1040/* 1041 * Mkdir system call 1042 */ 1043int 1044ext2fs_mkdir(void *v) 1045{ 1046 struct vop_mkdir_args /* { 1047 struct vnode *a_dvp; 1048 struct vnode **a_vpp; 1049 struct componentname *a_cnp; 1050 struct vattr *a_vap; 1051 } */ *ap = v; 1052 struct vnode *dvp = ap->a_dvp; 1053 struct vattr *vap = ap->a_vap; 1054 struct componentname *cnp = ap->a_cnp; 1055 struct inode *ip, *dp = VTOI(dvp); 1056 struct vnode *tvp; 1057 struct ext2fs_dirtemplate dirtemplate; 1058 int error, dmode; 1059 struct ufs_lookup_results *ulr; 1060 1061 /* XXX should handle this material another way */ 1062 ulr = &VTOI(dvp)->i_crap; 1063 UFS_CHECK_CRAPCOUNTER(VTOI(dvp)); 1064 1065 if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) { 1066 error = EMLINK; 1067 goto out; 1068 } 1069 dmode = vap->va_mode & ACCESSPERMS; 1070 dmode |= IFDIR; 1071 /* 1072 * Must simulate part of ext2fs_makeinode here to acquire the inode, 1073 * but not have it entered in the parent directory. The entry is 1074 * made later after writing "." and ".." entries. 1075 */ 1076 if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0) 1077 goto out; 1078 ip = VTOI(tvp); 1079 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1080 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1081 ip->i_e2fs_gid = dp->i_e2fs_gid; 1082 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1083 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1084 ip->i_e2fs_gid_high = dp->i_e2fs_gid_high; 1085 } else { 1086 ip->i_e2fs_uid_high = 0; 1087 ip->i_e2fs_gid_high = 0; 1088 } 1089 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1090 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1091 ip->i_e2fs_mode = dmode; 1092 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1093 ip->i_e2fs_nlink = 2; 1094 1095 /* 1096 * Bump link count in parent directory 1097 * to reflect work done below. Should 1098 * be done before reference is created 1099 * so reparation is possible if we crash. 1100 */ 1101 dp->i_e2fs_nlink++; 1102 dp->i_flag |= IN_CHANGE; 1103 if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0) 1104 goto bad; 1105 1106 /* Initialize directory with "." and ".." from static template. */ 1107 memset(&dirtemplate, 0, sizeof(dirtemplate)); 1108 dirtemplate.dot_ino = h2fs32(ip->i_number); 1109 dirtemplate.dot_reclen = h2fs16(12); 1110 dirtemplate.dot_namlen = 1; 1111 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1112 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1113 dirtemplate.dot_type = EXT2_FT_DIR; 1114 } 1115 dirtemplate.dot_name[0] = '.'; 1116 dirtemplate.dotdot_ino = h2fs32(dp->i_number); 1117 dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12); 1118 dirtemplate.dotdot_namlen = 2; 1119 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 && 1120 (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) { 1121 dirtemplate.dotdot_type = EXT2_FT_DIR; 1122 } 1123 dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.'; 1124 error = vn_rdwr(UIO_WRITE, tvp, (void *)&dirtemplate, 1125 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1126 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (size_t *)0, NULL); 1127 if (error) { 1128 dp->i_e2fs_nlink--; 1129 dp->i_flag |= IN_CHANGE; 1130 goto bad; 1131 } 1132 if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize) 1133 panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */ 1134 else { 1135 error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize); 1136 if (error) { 1137 dp->i_e2fs_nlink--; 1138 dp->i_flag |= IN_CHANGE; 1139 goto bad; 1140 } 1141 ip->i_flag |= IN_CHANGE; 1142 uvm_vnp_setsize(tvp, ext2fs_size(ip)); 1143 } 1144 1145 /* Directory set up, now install it's entry in the parent directory. */ 1146 error = ext2fs_direnter(ip, dvp, ulr, cnp); 1147 if (error != 0) { 1148 dp->i_e2fs_nlink--; 1149 dp->i_flag |= IN_CHANGE; 1150 } 1151bad: 1152 /* 1153 * No need to do an explicit ext2fs_truncate here, vrele will do this 1154 * for us because we set the link count to 0. 1155 */ 1156 if (error) { 1157 ip->i_e2fs_nlink = 0; 1158 ip->i_flag |= IN_CHANGE; 1159 vput(tvp); 1160 } else { 1161 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1162 *ap->a_vpp = tvp; 1163 } 1164out: 1165 vput(dvp); 1166 return (error); 1167} 1168 1169/* 1170 * Rmdir system call. 1171 */ 1172int 1173ext2fs_rmdir(void *v) 1174{ 1175 struct vop_rmdir_args /* { 1176 struct vnode *a_dvp; 1177 struct vnode *a_vp; 1178 struct componentname *a_cnp; 1179 } */ *ap = v; 1180 struct vnode *vp = ap->a_vp; 1181 struct vnode *dvp = ap->a_dvp; 1182 struct componentname *cnp = ap->a_cnp; 1183 struct inode *ip, *dp; 1184 int error; 1185 struct ufs_lookup_results *ulr; 1186 1187 ip = VTOI(vp); 1188 dp = VTOI(dvp); 1189 1190 /* XXX should handle this material another way */ 1191 ulr = &dp->i_crap; 1192 UFS_CHECK_CRAPCOUNTER(dp); 1193 1194 /* 1195 * No rmdir "." please. 1196 */ 1197 if (dp == ip) { 1198 vrele(dvp); 1199 vput(vp); 1200 return (EINVAL); 1201 } 1202 /* 1203 * Verify the directory is empty (and valid). 1204 * (Rmdir ".." won't be valid since 1205 * ".." will contain a reference to 1206 * the current directory and thus be 1207 * non-empty.) 1208 */ 1209 error = 0; 1210 if (ip->i_e2fs_nlink != 2 || 1211 !ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1212 error = ENOTEMPTY; 1213 goto out; 1214 } 1215 if ((dp->i_e2fs_flags & EXT2_APPEND) || 1216 (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND))) { 1217 error = EPERM; 1218 goto out; 1219 } 1220 /* 1221 * Delete reference to directory before purging 1222 * inode. If we crash in between, the directory 1223 * will be reattached to lost+found, 1224 */ 1225 error = ext2fs_dirremove(dvp, ulr, cnp); 1226 if (error != 0) 1227 goto out; 1228 dp->i_e2fs_nlink--; 1229 dp->i_flag |= IN_CHANGE; 1230 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1231 cache_purge(dvp); 1232 vput(dvp); 1233 dvp = NULL; 1234 /* 1235 * Truncate inode. The only stuff left 1236 * in the directory is "." and "..". The 1237 * "." reference is inconsequential since 1238 * we're quashing it. The ".." reference 1239 * has already been adjusted above. We've 1240 * removed the "." reference and the reference 1241 * in the parent directory, but there may be 1242 * other hard links so decrement by 2 and 1243 * worry about them later. 1244 */ 1245 ip->i_e2fs_nlink -= 2; 1246 error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred); 1247 cache_purge(ITOV(ip)); 1248out: 1249 VN_KNOTE(vp, NOTE_DELETE); 1250 if (dvp) 1251 vput(dvp); 1252 vput(vp); 1253 return (error); 1254} 1255 1256/* 1257 * symlink -- make a symbolic link 1258 */ 1259int 1260ext2fs_symlink(void *v) 1261{ 1262 struct vop_symlink_args /* { 1263 struct vnode *a_dvp; 1264 struct vnode **a_vpp; 1265 struct componentname *a_cnp; 1266 struct vattr *a_vap; 1267 char *a_target; 1268 } */ *ap = v; 1269 struct vnode *vp, **vpp; 1270 struct inode *ip; 1271 int len, error; 1272 1273 vpp = ap->a_vpp; 1274 error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1275 vpp, ap->a_cnp); 1276 if (error) 1277 return (error); 1278 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1279 vp = *vpp; 1280 len = strlen(ap->a_target); 1281 ip = VTOI(vp); 1282 if (len < ip->i_ump->um_maxsymlinklen) { 1283 memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len); 1284 error = ext2fs_setsize(ip, len); 1285 if (error) 1286 goto bad; 1287 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1288 if (vp->v_mount->mnt_flag & MNT_RELATIME) 1289 ip->i_flag |= IN_ACCESS; 1290 uvm_vnp_setsize(vp, len); 1291 } else 1292 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1293 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, 1294 (size_t *)0, NULL); 1295bad: 1296 if (error) 1297 vput(vp); 1298 return (error); 1299} 1300 1301/* 1302 * Return target name of a symbolic link 1303 */ 1304int 1305ext2fs_readlink(void *v) 1306{ 1307 struct vop_readlink_args /* { 1308 struct vnode *a_vp; 1309 struct uio *a_uio; 1310 kauth_cred_t a_cred; 1311 } */ *ap = v; 1312 struct vnode *vp = ap->a_vp; 1313 struct inode *ip = VTOI(vp); 1314 struct ufsmount *ump = ip->i_ump; 1315 int isize; 1316 1317 isize = ext2fs_size(ip); 1318 if (isize < ump->um_maxsymlinklen || 1319 (ump->um_maxsymlinklen == 0 && ip->i_e2fs_nblock == 0)) { 1320 uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio); 1321 return (0); 1322 } 1323 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1324} 1325 1326/* 1327 * Advisory record locking support 1328 */ 1329int 1330ext2fs_advlock(void *v) 1331{ 1332 struct vop_advlock_args /* { 1333 struct vnode *a_vp; 1334 void * a_id; 1335 int a_op; 1336 struct flock *a_fl; 1337 int a_flags; 1338 } */ *ap = v; 1339 struct inode *ip = VTOI(ap->a_vp); 1340 1341 return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip)); 1342} 1343 1344int 1345ext2fs_fsync(void *v) 1346{ 1347 struct vop_fsync_args /* { 1348 struct vnode *a_vp; 1349 kauth_cred_t a_cred; 1350 int a_flags; 1351 off_t offlo; 1352 off_t offhi; 1353 struct proc *a_p; 1354 } */ *ap = v; 1355 struct vnode *vp = ap->a_vp; 1356 int wait; 1357 int error; 1358 1359 wait = (ap->a_flags & FSYNC_WAIT) != 0; 1360 1361 if (vp->v_type == VBLK) 1362 error = spec_fsync(v); 1363 else 1364 error = vflushbuf(vp, wait); 1365 if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0) 1366 error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0); 1367 1368 if (error == 0 && ap->a_flags & FSYNC_CACHE) { 1369 int l = 0; 1370 error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE, 1371 curlwp->l_cred); 1372 } 1373 1374 return error; 1375} 1376 1377/* 1378 * Initialize the vnode associated with a new inode, handle aliased 1379 * vnodes. 1380 */ 1381int 1382ext2fs_vinit(struct mount *mntp, int (**specops)(void *), 1383 int (**fifoops)(void *), struct vnode **vpp) 1384{ 1385 struct timeval tv; 1386 struct inode *ip; 1387 struct vnode *vp; 1388 1389 vp = *vpp; 1390 ip = VTOI(vp); 1391 switch(vp->v_type = IFTOVT(ip->i_e2fs_mode)) { 1392 case VCHR: 1393 case VBLK: 1394 vp->v_op = specops; 1395 spec_node_init(vp, fs2h32(ip->i_din.e2fs_din->e2di_rdev)); 1396 break; 1397 case VFIFO: 1398 vp->v_op = fifoops; 1399 break; 1400 case VNON: 1401 case VBAD: 1402 case VSOCK: 1403 case VLNK: 1404 case VDIR: 1405 case VREG: 1406 break; 1407 } 1408 if (ip->i_number == ROOTINO) 1409 vp->v_vflag |= VV_ROOT; 1410 /* 1411 * Initialize modrev times 1412 */ 1413 getmicrouptime(&tv); 1414 SETHIGH(ip->i_modrev, tv.tv_sec); 1415 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 1416 *vpp = vp; 1417 return (0); 1418} 1419 1420/* 1421 * Allocate a new inode. 1422 */ 1423int 1424ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1425 struct componentname *cnp) 1426{ 1427 struct inode *ip, *pdir; 1428 struct vnode *tvp; 1429 int error, ismember = 0; 1430 struct ufs_lookup_results *ulr; 1431 1432 pdir = VTOI(dvp); 1433 1434 /* XXX should handle this material another way */ 1435 ulr = &pdir->i_crap; 1436 UFS_CHECK_CRAPCOUNTER(pdir); 1437 1438 *vpp = NULL; 1439 if ((mode & IFMT) == 0) 1440 mode |= IFREG; 1441 1442 if ((error = ext2fs_valloc(dvp, mode, cnp->cn_cred, &tvp)) != 0) { 1443 vput(dvp); 1444 return (error); 1445 } 1446 ip = VTOI(tvp); 1447 ip->i_uid = kauth_cred_geteuid(cnp->cn_cred); 1448 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1449 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1450 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1451 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1452 ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high; 1453 } else { 1454 ip->i_e2fs_uid_high = 0; 1455 ip->i_e2fs_gid_high = 0; 1456 } 1457 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1458 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1459 ip->i_e2fs_mode = mode; 1460 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1461 ip->i_e2fs_nlink = 1; 1462 if ((ip->i_e2fs_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred, 1463 ip->i_gid, &ismember) != 0 || !ismember) && 1464 kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) 1465 ip->i_e2fs_mode &= ~ISGID; 1466 1467 /* 1468 * Make sure inode goes to disk before directory entry. 1469 */ 1470 if ((error = ext2fs_update(tvp, NULL, NULL, UPDATE_WAIT)) != 0) 1471 goto bad; 1472 error = ext2fs_direnter(ip, dvp, ulr, cnp); 1473 if (error != 0) 1474 goto bad; 1475 vput(dvp); 1476 *vpp = tvp; 1477 return (0); 1478 1479bad: 1480 /* 1481 * Write error occurred trying to update the inode 1482 * or the directory so must deallocate the inode. 1483 */ 1484 tvp->v_type = VNON; /* Stop explosion if VBLK */ 1485 ip->i_e2fs_nlink = 0; 1486 ip->i_flag |= IN_CHANGE; 1487 vput(tvp); 1488 vput(dvp); 1489 return (error); 1490} 1491 1492/* 1493 * Reclaim an inode so that it can be used for other purposes. 1494 */ 1495int 1496ext2fs_reclaim(void *v) 1497{ 1498 struct vop_reclaim_args /* { 1499 struct vnode *a_vp; 1500 } */ *ap = v; 1501 struct vnode *vp = ap->a_vp; 1502 struct inode *ip = VTOI(vp); 1503 int error; 1504 1505 /* 1506 * The inode must be freed and updated before being removed 1507 * from its hash chain. Other threads trying to gain a hold 1508 * on the inode will be stalled because it is locked (VI_XLOCK). 1509 */ 1510 if (ip->i_omode == 1 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1511 ext2fs_vfree(vp, ip->i_number, ip->i_e2fs_mode); 1512 if ((error = ufs_reclaim(vp)) != 0) 1513 return (error); 1514 if (ip->i_din.e2fs_din != NULL) 1515 pool_put(&ext2fs_dinode_pool, ip->i_din.e2fs_din); 1516 genfs_node_destroy(vp); 1517 pool_put(&ext2fs_inode_pool, vp->v_data); 1518 vp->v_data = NULL; 1519 return (0); 1520} 1521 1522/* Global vfs data structures for ext2fs. */ 1523int (**ext2fs_vnodeop_p)(void *); 1524const struct vnodeopv_entry_desc ext2fs_vnodeop_entries[] = { 1525 { &vop_default_desc, vn_default_error }, 1526 { &vop_lookup_desc, ext2fs_lookup }, /* lookup */ 1527 { &vop_create_desc, ext2fs_create }, /* create */ 1528 { &vop_mknod_desc, ext2fs_mknod }, /* mknod */ 1529 { &vop_open_desc, ext2fs_open }, /* open */ 1530 { &vop_close_desc, ufs_close }, /* close */ 1531 { &vop_access_desc, ext2fs_access }, /* access */ 1532 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1533 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1534 { &vop_read_desc, ext2fs_read }, /* read */ 1535 { &vop_write_desc, ext2fs_write }, /* write */ 1536 { &vop_ioctl_desc, ufs_ioctl }, /* ioctl */ 1537 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1538 { &vop_poll_desc, ufs_poll }, /* poll */ 1539 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 1540 { &vop_revoke_desc, ufs_revoke }, /* revoke */ 1541 { &vop_mmap_desc, ufs_mmap }, /* mmap */ 1542 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1543 { &vop_seek_desc, ufs_seek }, /* seek */ 1544 { &vop_remove_desc, ext2fs_remove }, /* remove */ 1545 { &vop_link_desc, ext2fs_link }, /* link */ 1546 { &vop_rename_desc, ext2fs_rename }, /* rename */ 1547 { &vop_mkdir_desc, ext2fs_mkdir }, /* mkdir */ 1548 { &vop_rmdir_desc, ext2fs_rmdir }, /* rmdir */ 1549 { &vop_symlink_desc, ext2fs_symlink }, /* symlink */ 1550 { &vop_readdir_desc, ext2fs_readdir }, /* readdir */ 1551 { &vop_readlink_desc, ext2fs_readlink }, /* readlink */ 1552 { &vop_abortop_desc, ufs_abortop }, /* abortop */ 1553 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1554 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1555 { &vop_lock_desc, ufs_lock }, /* lock */ 1556 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1557 { &vop_bmap_desc, ext2fs_bmap }, /* bmap */ 1558 { &vop_strategy_desc, ufs_strategy }, /* strategy */ 1559 { &vop_print_desc, ufs_print }, /* print */ 1560 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1561 { &vop_pathconf_desc, ufs_pathconf }, /* pathconf */ 1562 { &vop_advlock_desc, ext2fs_advlock }, /* advlock */ 1563 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1564 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 1565 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 1566 { NULL, NULL } 1567}; 1568const struct vnodeopv_desc ext2fs_vnodeop_opv_desc = 1569 { &ext2fs_vnodeop_p, ext2fs_vnodeop_entries }; 1570 1571int (**ext2fs_specop_p)(void *); 1572const struct vnodeopv_entry_desc ext2fs_specop_entries[] = { 1573 { &vop_default_desc, vn_default_error }, 1574 { &vop_lookup_desc, spec_lookup }, /* lookup */ 1575 { &vop_create_desc, spec_create }, /* create */ 1576 { &vop_mknod_desc, spec_mknod }, /* mknod */ 1577 { &vop_open_desc, spec_open }, /* open */ 1578 { &vop_close_desc, ufsspec_close }, /* close */ 1579 { &vop_access_desc, ext2fs_access }, /* access */ 1580 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1581 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1582 { &vop_read_desc, ufsspec_read }, /* read */ 1583 { &vop_write_desc, ufsspec_write }, /* write */ 1584 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 1585 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1586 { &vop_poll_desc, spec_poll }, /* poll */ 1587 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 1588 { &vop_revoke_desc, spec_revoke }, /* revoke */ 1589 { &vop_mmap_desc, spec_mmap }, /* mmap */ 1590 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1591 { &vop_seek_desc, spec_seek }, /* seek */ 1592 { &vop_remove_desc, spec_remove }, /* remove */ 1593 { &vop_link_desc, spec_link }, /* link */ 1594 { &vop_rename_desc, spec_rename }, /* rename */ 1595 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 1596 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 1597 { &vop_symlink_desc, spec_symlink }, /* symlink */ 1598 { &vop_readdir_desc, spec_readdir }, /* readdir */ 1599 { &vop_readlink_desc, spec_readlink }, /* readlink */ 1600 { &vop_abortop_desc, spec_abortop }, /* abortop */ 1601 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1602 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1603 { &vop_lock_desc, ufs_lock }, /* lock */ 1604 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1605 { &vop_bmap_desc, spec_bmap }, /* bmap */ 1606 { &vop_strategy_desc, spec_strategy }, /* strategy */ 1607 { &vop_print_desc, ufs_print }, /* print */ 1608 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1609 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 1610 { &vop_advlock_desc, spec_advlock }, /* advlock */ 1611 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1612 { &vop_getpages_desc, spec_getpages }, /* getpages */ 1613 { &vop_putpages_desc, spec_putpages }, /* putpages */ 1614 { NULL, NULL } 1615}; 1616const struct vnodeopv_desc ext2fs_specop_opv_desc = 1617 { &ext2fs_specop_p, ext2fs_specop_entries }; 1618 1619int (**ext2fs_fifoop_p)(void *); 1620const struct vnodeopv_entry_desc ext2fs_fifoop_entries[] = { 1621 { &vop_default_desc, vn_default_error }, 1622 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 1623 { &vop_create_desc, vn_fifo_bypass }, /* create */ 1624 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 1625 { &vop_open_desc, vn_fifo_bypass }, /* open */ 1626 { &vop_close_desc, ufsfifo_close }, /* close */ 1627 { &vop_access_desc, ext2fs_access }, /* access */ 1628 { &vop_getattr_desc, ext2fs_getattr }, /* getattr */ 1629 { &vop_setattr_desc, ext2fs_setattr }, /* setattr */ 1630 { &vop_read_desc, ufsfifo_read }, /* read */ 1631 { &vop_write_desc, ufsfifo_write }, /* write */ 1632 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 1633 { &vop_fcntl_desc, ufs_fcntl }, /* fcntl */ 1634 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 1635 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 1636 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 1637 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 1638 { &vop_fsync_desc, ext2fs_fsync }, /* fsync */ 1639 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 1640 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 1641 { &vop_link_desc, vn_fifo_bypass }, /* link */ 1642 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 1643 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 1644 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 1645 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 1646 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 1647 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 1648 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 1649 { &vop_inactive_desc, ext2fs_inactive }, /* inactive */ 1650 { &vop_reclaim_desc, ext2fs_reclaim }, /* reclaim */ 1651 { &vop_lock_desc, ufs_lock }, /* lock */ 1652 { &vop_unlock_desc, ufs_unlock }, /* unlock */ 1653 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 1654 { &vop_strategy_desc, vn_fifo_bypass }, /* strategy */ 1655 { &vop_print_desc, ufs_print }, /* print */ 1656 { &vop_islocked_desc, ufs_islocked }, /* islocked */ 1657 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 1658 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 1659 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 1660 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 1661 { NULL, NULL } 1662}; 1663const struct vnodeopv_desc ext2fs_fifoop_opv_desc = 1664 { &ext2fs_fifoop_p, ext2fs_fifoop_entries };