1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * Copyright (c) 1982, 1986, 1989, 1993 9 * The Regents of the University of California. All rights reserved. 10 * (c) UNIX System Laboratories, Inc. 11 * All or some portions of this file are derived from material licensed 12 * to the University of California by American Telephone and Telegraph 13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 14 * the permission of UNIX System Laboratories, Inc. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94 41 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 42 * $FreeBSD$ 43 */ 44 45 #include "opt_suiddir.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/fcntl.h> 51 #include <sys/stat.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/endian.h> 55 #include <sys/priv.h> 56 #include <sys/mount.h> 57 #include <sys/unistd.h> 58 #include <sys/time.h> 59 #include <sys/vnode.h> 60 #include <sys/namei.h> 61 #include <sys/lockf.h> 62 #include <sys/event.h> 63 #include <sys/conf.h> 64 #include <sys/file.h> 65 66 #include <vm/vm.h> 67 #include <vm/vm_extern.h> 68 #include <vm/vnode_pager.h> 69 70 #include <fs/fifofs/fifo.h> 71 72 #include <ufs/ufs/dir.h> 73 74 #include <fs/ext2fs/inode.h> 75 #include <fs/ext2fs/ext2_mount.h> 76 #include <fs/ext2fs/fs.h> 77 #include <fs/ext2fs/ext2_extern.h> 78 #include <fs/ext2fs/ext2fs.h> 79 #include <fs/ext2fs/ext2_dir.h> 80 81 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 82 static void ext2_itimes_locked(struct vnode *); 83 84 static vop_access_t ext2_access; 85 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 86 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 87 struct thread *); 88 static vop_close_t ext2_close; 89 static vop_create_t ext2_create; 90 static vop_fsync_t ext2_fsync; 91 static vop_getattr_t ext2_getattr; 92 static vop_link_t ext2_link; 93 static vop_mkdir_t ext2_mkdir; 94 static vop_mknod_t ext2_mknod; 95 static vop_open_t ext2_open; 96 static vop_pathconf_t ext2_pathconf; 97 static vop_print_t ext2_print; 98 static vop_read_t ext2_read; 99 static vop_readlink_t ext2_readlink; 100 static vop_remove_t ext2_remove; 101 static vop_rename_t ext2_rename; 102 static vop_rmdir_t ext2_rmdir; 103 static vop_setattr_t ext2_setattr; 104 static vop_strategy_t ext2_strategy; 105 static vop_symlink_t ext2_symlink; 106 static vop_write_t ext2_write; 107 static vop_vptofh_t ext2_vptofh; 108 static vop_close_t ext2fifo_close; 109 static vop_kqfilter_t ext2fifo_kqfilter; 110 111 /* Global vfs data structures for ext2. */ 112 struct vop_vector ext2_vnodeops = { 113 .vop_default = &default_vnodeops, 114 .vop_access = ext2_access, 115 .vop_bmap = ext2_bmap, 116 .vop_cachedlookup = ext2_lookup, 117 .vop_close = ext2_close, 118 .vop_create = ext2_create, 119 .vop_fsync = ext2_fsync, 120 .vop_getattr = ext2_getattr, 121 .vop_inactive = ext2_inactive, 122 .vop_link = ext2_link, 123 .vop_lookup = vfs_cache_lookup, 124 .vop_mkdir = ext2_mkdir, 125 .vop_mknod = ext2_mknod, 126 .vop_open = ext2_open, 127 .vop_pathconf = ext2_pathconf, 128 .vop_poll = vop_stdpoll, 129 .vop_print = ext2_print, 130 .vop_read = ext2_read, 131 .vop_readdir = ext2_readdir, 132 .vop_readlink = ext2_readlink, 133 .vop_reallocblks = ext2_reallocblks, 134 .vop_reclaim = ext2_reclaim, 135 .vop_remove = ext2_remove, 136 .vop_rename = ext2_rename, 137 .vop_rmdir = ext2_rmdir, 138 .vop_setattr = ext2_setattr, 139 .vop_strategy = ext2_strategy, 140 .vop_symlink = ext2_symlink, 141 .vop_write = ext2_write, 142 .vop_vptofh = ext2_vptofh, 143 }; 144 145 struct vop_vector ext2_fifoops = { 146 .vop_default = &fifo_specops, 147 .vop_access = ext2_access, 148 .vop_close = ext2fifo_close, 149 .vop_fsync = ext2_fsync, 150 .vop_getattr = ext2_getattr, 151 .vop_inactive = ext2_inactive, 152 .vop_kqfilter = ext2fifo_kqfilter, 153 .vop_print = ext2_print, 154 .vop_read = VOP_PANIC, 155 .vop_reclaim = ext2_reclaim, 156 .vop_setattr = ext2_setattr, 157 .vop_write = VOP_PANIC, 158 .vop_vptofh = ext2_vptofh, 159 }; 160 161 #include <fs/ext2fs/ext2_readwrite.c> 162 163 /* 164 * A virgin directory (no blushing please). 165 * Note that the type and namlen fields are reversed relative to ext2. 166 * Also, we don't use `struct odirtemplate', since it would just cause 167 * endianness problems. 168 */ 169 static struct dirtemplate mastertemplate = { 170 0, 12, 1, EXT2_FT_DIR, ".", 171 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 172 }; 173 static struct dirtemplate omastertemplate = { 174 0, 12, 1, EXT2_FT_UNKNOWN, ".", 175 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 176 }; 177 178 static void 179 ext2_itimes_locked(struct vnode *vp) 180 { 181 struct inode *ip; 182 struct timespec ts; 183 184 ASSERT_VI_LOCKED(vp, __func__); 185 186 ip = VTOI(vp); 187 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 188 return; 189 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 190 ip->i_flag |= IN_LAZYMOD; 191 else 192 ip->i_flag |= IN_MODIFIED; 193 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 194 vfs_timestamp(&ts); 195 if (ip->i_flag & IN_ACCESS) { 196 ip->i_atime = ts.tv_sec; 197 ip->i_atimensec = ts.tv_nsec; 198 } 199 if (ip->i_flag & IN_UPDATE) { 200 ip->i_mtime = ts.tv_sec; 201 ip->i_mtimensec = ts.tv_nsec; 202 ip->i_modrev++; 203 } 204 if (ip->i_flag & IN_CHANGE) { 205 ip->i_ctime = ts.tv_sec; 206 ip->i_ctimensec = ts.tv_nsec; 207 } 208 } 209 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 210 } 211 212 void 213 ext2_itimes(struct vnode *vp) 214 { 215 216 VI_LOCK(vp); 217 ext2_itimes_locked(vp); 218 VI_UNLOCK(vp); 219 } 220 221 /* 222 * Create a regular file 223 */ 224 static int 225 ext2_create(ap) 226 struct vop_create_args /* { 227 struct vnode *a_dvp; 228 struct vnode **a_vpp; 229 struct componentname *a_cnp; 230 struct vattr *a_vap; 231 } */ *ap; 232 { 233 int error; 234 235 error = 236 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 237 ap->a_dvp, ap->a_vpp, ap->a_cnp); 238 if (error) 239 return (error); 240 return (0); 241 } 242 243 static int 244 ext2_open(ap) 245 struct vop_open_args /* { 246 struct vnode *a_vp; 247 int a_mode; 248 struct ucred *a_cred; 249 struct thread *a_td; 250 } */ *ap; 251 { 252 253 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 254 return (EOPNOTSUPP); 255 256 /* 257 * Files marked append-only must be opened for appending. 258 */ 259 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 260 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 261 return (EPERM); 262 263 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 264 265 return (0); 266 } 267 268 /* 269 * Close called. 270 * 271 * Update the times on the inode. 272 */ 273 static int 274 ext2_close(ap) 275 struct vop_close_args /* { 276 struct vnode *a_vp; 277 int a_fflag; 278 struct ucred *a_cred; 279 struct thread *a_td; 280 } */ *ap; 281 { 282 struct vnode *vp = ap->a_vp; 283 284 VI_LOCK(vp); 285 if (vp->v_usecount > 1) 286 ext2_itimes_locked(vp); 287 VI_UNLOCK(vp); 288 return (0); 289 } 290 291 static int 292 ext2_access(ap) 293 struct vop_access_args /* { 294 struct vnode *a_vp; 295 accmode_t a_accmode; 296 struct ucred *a_cred; 297 struct thread *a_td; 298 } */ *ap; 299 { 300 struct vnode *vp = ap->a_vp; 301 struct inode *ip = VTOI(vp); 302 accmode_t accmode = ap->a_accmode; 303 int error; 304 305 if (vp->v_type == VBLK || vp->v_type == VCHR) 306 return (EOPNOTSUPP); 307 308 /* 309 * Disallow write attempts on read-only file systems; 310 * unless the file is a socket, fifo, or a block or 311 * character device resident on the file system. 312 */ 313 if (accmode & VWRITE) { 314 switch (vp->v_type) { 315 case VDIR: 316 case VLNK: 317 case VREG: 318 if (vp->v_mount->mnt_flag & MNT_RDONLY) 319 return (EROFS); 320 break; 321 default: 322 break; 323 } 324 } 325 326 /* If immutable bit set, nobody gets to write it. */ 327 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 328 return (EPERM); 329 330 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 331 ap->a_accmode, ap->a_cred, NULL); 332 return (error); 333 } 334 335 static int 336 ext2_getattr(ap) 337 struct vop_getattr_args /* { 338 struct vnode *a_vp; 339 struct vattr *a_vap; 340 struct ucred *a_cred; 341 } */ *ap; 342 { 343 struct vnode *vp = ap->a_vp; 344 struct inode *ip = VTOI(vp); 345 struct vattr *vap = ap->a_vap; 346 347 ext2_itimes(vp); 348 /* 349 * Copy from inode table 350 */ 351 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 352 vap->va_fileid = ip->i_number; 353 vap->va_mode = ip->i_mode & ~IFMT; 354 vap->va_nlink = ip->i_nlink; 355 vap->va_uid = ip->i_uid; 356 vap->va_gid = ip->i_gid; 357 vap->va_rdev = ip->i_rdev; 358 vap->va_size = ip->i_size; 359 vap->va_atime.tv_sec = ip->i_atime; 360 vap->va_atime.tv_nsec = ip->i_atimensec; 361 vap->va_mtime.tv_sec = ip->i_mtime; 362 vap->va_mtime.tv_nsec = ip->i_mtimensec; 363 vap->va_ctime.tv_sec = ip->i_ctime; 364 vap->va_ctime.tv_nsec = ip->i_ctimensec; 365 vap->va_flags = ip->i_flags; 366 vap->va_gen = ip->i_gen; 367 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 368 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 369 vap->va_type = IFTOVT(ip->i_mode); 370 vap->va_filerev = ip->i_modrev; 371 return (0); 372 } 373 374 /* 375 * Set attribute vnode op. called from several syscalls 376 */ 377 static int 378 ext2_setattr(ap) 379 struct vop_setattr_args /* { 380 struct vnode *a_vp; 381 struct vattr *a_vap; 382 struct ucred *a_cred; 383 } */ *ap; 384 { 385 struct vattr *vap = ap->a_vap; 386 struct vnode *vp = ap->a_vp; 387 struct inode *ip = VTOI(vp); 388 struct ucred *cred = ap->a_cred; 389 struct thread *td = curthread; 390 int error; 391 392 /* 393 * Check for unsettable attributes. 394 */ 395 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 396 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 397 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 398 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 399 return (EINVAL); 400 } 401 if (vap->va_flags != VNOVAL) { 402 /* Disallow flags not supported by ext2fs. */ 403 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 404 return (EOPNOTSUPP); 405 406 if (vp->v_mount->mnt_flag & MNT_RDONLY) 407 return (EROFS); 408 /* 409 * Callers may only modify the file flags on objects they 410 * have VADMIN rights for. 411 */ 412 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 413 return (error); 414 /* 415 * Unprivileged processes and privileged processes in 416 * jail() are not permitted to unset system flags, or 417 * modify flags if any system flags are set. 418 * Privileged non-jail processes may not modify system flags 419 * if securelevel > 0 and any existing system flags are set. 420 */ 421 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 422 if (ip->i_flags 423 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 424 error = securelevel_gt(cred, 0); 425 if (error) 426 return (error); 427 } 428 ip->i_flags = vap->va_flags; 429 } else { 430 if (ip->i_flags 431 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 432 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 433 return (EPERM); 434 ip->i_flags &= SF_SETTABLE; 435 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 436 } 437 ip->i_flag |= IN_CHANGE; 438 if (vap->va_flags & (IMMUTABLE | APPEND)) 439 return (0); 440 } 441 if (ip->i_flags & (IMMUTABLE | APPEND)) 442 return (EPERM); 443 /* 444 * Go through the fields and update iff not VNOVAL. 445 */ 446 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 447 if (vp->v_mount->mnt_flag & MNT_RDONLY) 448 return (EROFS); 449 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 450 td)) != 0) 451 return (error); 452 } 453 if (vap->va_size != VNOVAL) { 454 /* 455 * Disallow write attempts on read-only file systems; 456 * unless the file is a socket, fifo, or a block or 457 * character device resident on the file system. 458 */ 459 switch (vp->v_type) { 460 case VDIR: 461 return (EISDIR); 462 case VLNK: 463 case VREG: 464 if (vp->v_mount->mnt_flag & MNT_RDONLY) 465 return (EROFS); 466 break; 467 default: 468 break; 469 } 470 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 471 return (error); 472 } 473 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 474 if (vp->v_mount->mnt_flag & MNT_RDONLY) 475 return (EROFS); 476 /* 477 * From utimes(2): 478 * If times is NULL, ... The caller must be the owner of 479 * the file, have permission to write the file, or be the 480 * super-user. 481 * If times is non-NULL, ... The caller must be the owner of 482 * the file or be the super-user. 483 */ 484 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 485 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 486 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 487 return (error); 488 if (vap->va_atime.tv_sec != VNOVAL) 489 ip->i_flag |= IN_ACCESS; 490 if (vap->va_mtime.tv_sec != VNOVAL) 491 ip->i_flag |= IN_CHANGE | IN_UPDATE; 492 ext2_itimes(vp); 493 if (vap->va_atime.tv_sec != VNOVAL) { 494 ip->i_atime = vap->va_atime.tv_sec; 495 ip->i_atimensec = vap->va_atime.tv_nsec; 496 } 497 if (vap->va_mtime.tv_sec != VNOVAL) { 498 ip->i_mtime = vap->va_mtime.tv_sec; 499 ip->i_mtimensec = vap->va_mtime.tv_nsec; 500 } 501 error = ext2_update(vp, 0); 502 if (error) 503 return (error); 504 } 505 error = 0; 506 if (vap->va_mode != (mode_t)VNOVAL) { 507 if (vp->v_mount->mnt_flag & MNT_RDONLY) 508 return (EROFS); 509 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 510 } 511 return (error); 512 } 513 514 /* 515 * Change the mode on a file. 516 * Inode must be locked before calling. 517 */ 518 static int 519 ext2_chmod(vp, mode, cred, td) 520 struct vnode *vp; 521 int mode; 522 struct ucred *cred; 523 struct thread *td; 524 { 525 struct inode *ip = VTOI(vp); 526 int error; 527 528 /* 529 * To modify the permissions on a file, must possess VADMIN 530 * for that file. 531 */ 532 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 533 return (error); 534 /* 535 * Privileged processes may set the sticky bit on non-directories, 536 * as well as set the setgid bit on a file with a group that the 537 * process is not a member of. 538 */ 539 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 540 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 541 if (error) 542 return (EFTYPE); 543 } 544 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 545 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 546 if (error) 547 return (error); 548 } 549 ip->i_mode &= ~ALLPERMS; 550 ip->i_mode |= (mode & ALLPERMS); 551 ip->i_flag |= IN_CHANGE; 552 return (0); 553 } 554 555 /* 556 * Perform chown operation on inode ip; 557 * inode must be locked prior to call. 558 */ 559 static int 560 ext2_chown(vp, uid, gid, cred, td) 561 struct vnode *vp; 562 uid_t uid; 563 gid_t gid; 564 struct ucred *cred; 565 struct thread *td; 566 { 567 struct inode *ip = VTOI(vp); 568 uid_t ouid; 569 gid_t ogid; 570 int error = 0; 571 572 if (uid == (uid_t)VNOVAL) 573 uid = ip->i_uid; 574 if (gid == (gid_t)VNOVAL) 575 gid = ip->i_gid; 576 /* 577 * To modify the ownership of a file, must possess VADMIN 578 * for that file. 579 */ 580 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 581 return (error); 582 /* 583 * To change the owner of a file, or change the group of a file 584 * to a group of which we are not a member, the caller must 585 * have privilege. 586 */ 587 if (uid != ip->i_uid || (gid != ip->i_gid && 588 !groupmember(gid, cred))) { 589 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 590 if (error) 591 return (error); 592 } 593 ogid = ip->i_gid; 594 ouid = ip->i_uid; 595 ip->i_gid = gid; 596 ip->i_uid = uid; 597 ip->i_flag |= IN_CHANGE; 598 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 599 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 600 ip->i_mode &= ~(ISUID | ISGID); 601 } 602 return (0); 603 } 604 605 /* 606 * Synch an open file. 607 */ 608 /* ARGSUSED */ 609 static int 610 ext2_fsync(ap) 611 struct vop_fsync_args /* { 612 struct vnode *a_vp; 613 struct ucred *a_cred; 614 int a_waitfor; 615 struct thread *a_td; 616 } */ *ap; 617 { 618 /* 619 * Flush all dirty buffers associated with a vnode. 620 */ 621 622 vop_stdfsync(ap); 623 624 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 625 } 626 627 /* 628 * Mknod vnode call 629 */ 630 /* ARGSUSED */ 631 static int 632 ext2_mknod(ap) 633 struct vop_mknod_args /* { 634 struct vnode *a_dvp; 635 struct vnode **a_vpp; 636 struct componentname *a_cnp; 637 struct vattr *a_vap; 638 } */ *ap; 639 { 640 struct vattr *vap = ap->a_vap; 641 struct vnode **vpp = ap->a_vpp; 642 struct inode *ip; 643 ino_t ino; 644 int error; 645 646 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 647 ap->a_dvp, vpp, ap->a_cnp); 648 if (error) 649 return (error); 650 ip = VTOI(*vpp); 651 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 652 if (vap->va_rdev != VNOVAL) { 653 /* 654 * Want to be able to use this to make badblock 655 * inodes, so don't truncate the dev number. 656 */ 657 ip->i_rdev = vap->va_rdev; 658 } 659 /* 660 * Remove inode, then reload it through VFS_VGET so it is 661 * checked to see if it is an alias of an existing entry in 662 * the inode cache. XXX I don't believe this is necessary now. 663 */ 664 (*vpp)->v_type = VNON; 665 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 666 vgone(*vpp); 667 vput(*vpp); 668 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 669 if (error) { 670 *vpp = NULL; 671 return (error); 672 } 673 return (0); 674 } 675 676 static int 677 ext2_remove(ap) 678 struct vop_remove_args /* { 679 struct vnode *a_dvp; 680 struct vnode *a_vp; 681 struct componentname *a_cnp; 682 } */ *ap; 683 { 684 struct inode *ip; 685 struct vnode *vp = ap->a_vp; 686 struct vnode *dvp = ap->a_dvp; 687 int error; 688 689 ip = VTOI(vp); 690 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 691 (VTOI(dvp)->i_flags & APPEND)) { 692 error = EPERM; 693 goto out; 694 } 695 error = ext2_dirremove(dvp, ap->a_cnp); 696 if (error == 0) { 697 ip->i_nlink--; 698 ip->i_flag |= IN_CHANGE; 699 } 700 out: 701 return (error); 702 } 703 704 /* 705 * link vnode call 706 */ 707 static int 708 ext2_link(ap) 709 struct vop_link_args /* { 710 struct vnode *a_tdvp; 711 struct vnode *a_vp; 712 struct componentname *a_cnp; 713 } */ *ap; 714 { 715 struct vnode *vp = ap->a_vp; 716 struct vnode *tdvp = ap->a_tdvp; 717 struct componentname *cnp = ap->a_cnp; 718 struct inode *ip; 719 int error; 720 721 #ifdef DIAGNOSTIC 722 if ((cnp->cn_flags & HASBUF) == 0) 723 panic("ext2_link: no name"); 724 #endif 725 if (tdvp->v_mount != vp->v_mount) { 726 error = EXDEV; 727 goto out; 728 } 729 ip = VTOI(vp); 730 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 731 error = EMLINK; 732 goto out; 733 } 734 if (ip->i_flags & (IMMUTABLE | APPEND)) { 735 error = EPERM; 736 goto out; 737 } 738 ip->i_nlink++; 739 ip->i_flag |= IN_CHANGE; 740 error = ext2_update(vp, 1); 741 if (!error) 742 error = ext2_direnter(ip, tdvp, cnp); 743 if (error) { 744 ip->i_nlink--; 745 ip->i_flag |= IN_CHANGE; 746 } 747 out: 748 return (error); 749 } 750 751 /* 752 * Rename system call. 753 * rename("foo", "bar"); 754 * is essentially 755 * unlink("bar"); 756 * link("foo", "bar"); 757 * unlink("foo"); 758 * but ``atomically''. Can't do full commit without saving state in the 759 * inode on disk which isn't feasible at this time. Best we can do is 760 * always guarantee the target exists. 761 * 762 * Basic algorithm is: 763 * 764 * 1) Bump link count on source while we're linking it to the 765 * target. This also ensure the inode won't be deleted out 766 * from underneath us while we work (it may be truncated by 767 * a concurrent `trunc' or `open' for creation). 768 * 2) Link source to destination. If destination already exists, 769 * delete it first. 770 * 3) Unlink source reference to inode if still around. If a 771 * directory was moved and the parent of the destination 772 * is different from the source, patch the ".." entry in the 773 * directory. 774 */ 775 static int 776 ext2_rename(ap) 777 struct vop_rename_args /* { 778 struct vnode *a_fdvp; 779 struct vnode *a_fvp; 780 struct componentname *a_fcnp; 781 struct vnode *a_tdvp; 782 struct vnode *a_tvp; 783 struct componentname *a_tcnp; 784 } */ *ap; 785 { 786 struct vnode *tvp = ap->a_tvp; 787 struct vnode *tdvp = ap->a_tdvp; 788 struct vnode *fvp = ap->a_fvp; 789 struct vnode *fdvp = ap->a_fdvp; 790 struct componentname *tcnp = ap->a_tcnp; 791 struct componentname *fcnp = ap->a_fcnp; 792 struct inode *ip, *xp, *dp; 793 struct dirtemplate dirbuf; 794 int doingdirectory = 0, oldparent = 0, newparent = 0; 795 int error = 0; 796 u_char namlen; 797 798 #ifdef DIAGNOSTIC 799 if ((tcnp->cn_flags & HASBUF) == 0 || 800 (fcnp->cn_flags & HASBUF) == 0) 801 panic("ext2_rename: no name"); 802 #endif 803 /* 804 * Check for cross-device rename. 805 */ 806 if ((fvp->v_mount != tdvp->v_mount) || 807 (tvp && (fvp->v_mount != tvp->v_mount))) { 808 error = EXDEV; 809 abortit: 810 if (tdvp == tvp) 811 vrele(tdvp); 812 else 813 vput(tdvp); 814 if (tvp) 815 vput(tvp); 816 vrele(fdvp); 817 vrele(fvp); 818 return (error); 819 } 820 821 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 822 (VTOI(tdvp)->i_flags & APPEND))) { 823 error = EPERM; 824 goto abortit; 825 } 826 827 /* 828 * Renaming a file to itself has no effect. The upper layers should 829 * not call us in that case. Temporarily just warn if they do. 830 */ 831 if (fvp == tvp) { 832 printf("ext2_rename: fvp == tvp (can't happen)\n"); 833 error = 0; 834 goto abortit; 835 } 836 837 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 838 goto abortit; 839 dp = VTOI(fdvp); 840 ip = VTOI(fvp); 841 if (ip->i_nlink >= LINK_MAX) { 842 VOP_UNLOCK(fvp, 0); 843 error = EMLINK; 844 goto abortit; 845 } 846 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 847 || (dp->i_flags & APPEND)) { 848 VOP_UNLOCK(fvp, 0); 849 error = EPERM; 850 goto abortit; 851 } 852 if ((ip->i_mode & IFMT) == IFDIR) { 853 /* 854 * Avoid ".", "..", and aliases of "." for obvious reasons. 855 */ 856 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 857 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 858 (ip->i_flag & IN_RENAME)) { 859 VOP_UNLOCK(fvp, 0); 860 error = EINVAL; 861 goto abortit; 862 } 863 ip->i_flag |= IN_RENAME; 864 oldparent = dp->i_number; 865 doingdirectory++; 866 } 867 vrele(fdvp); 868 869 /* 870 * When the target exists, both the directory 871 * and target vnodes are returned locked. 872 */ 873 dp = VTOI(tdvp); 874 xp = NULL; 875 if (tvp) 876 xp = VTOI(tvp); 877 878 /* 879 * 1) Bump link count while we're moving stuff 880 * around. If we crash somewhere before 881 * completing our work, the link count 882 * may be wrong, but correctable. 883 */ 884 ip->i_nlink++; 885 ip->i_flag |= IN_CHANGE; 886 if ((error = ext2_update(fvp, 1)) != 0) { 887 VOP_UNLOCK(fvp, 0); 888 goto bad; 889 } 890 891 /* 892 * If ".." must be changed (ie the directory gets a new 893 * parent) then the source directory must not be in the 894 * directory hierarchy above the target, as this would 895 * orphan everything below the source directory. Also 896 * the user must have write permission in the source so 897 * as to be able to change "..". We must repeat the call 898 * to namei, as the parent directory is unlocked by the 899 * call to checkpath(). 900 */ 901 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 902 VOP_UNLOCK(fvp, 0); 903 if (oldparent != dp->i_number) 904 newparent = dp->i_number; 905 if (doingdirectory && newparent) { 906 if (error) /* write access check above */ 907 goto bad; 908 if (xp != NULL) 909 vput(tvp); 910 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 911 if (error) 912 goto out; 913 VREF(tdvp); 914 error = relookup(tdvp, &tvp, tcnp); 915 if (error) 916 goto out; 917 vrele(tdvp); 918 dp = VTOI(tdvp); 919 xp = NULL; 920 if (tvp) 921 xp = VTOI(tvp); 922 } 923 /* 924 * 2) If target doesn't exist, link the target 925 * to the source and unlink the source. 926 * Otherwise, rewrite the target directory 927 * entry to reference the source inode and 928 * expunge the original entry's existence. 929 */ 930 if (xp == NULL) { 931 if (dp->i_devvp != ip->i_devvp) 932 panic("ext2_rename: EXDEV"); 933 /* 934 * Account for ".." in new directory. 935 * When source and destination have the same 936 * parent we don't fool with the link count. 937 */ 938 if (doingdirectory && newparent) { 939 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 940 error = EMLINK; 941 goto bad; 942 } 943 dp->i_nlink++; 944 dp->i_flag |= IN_CHANGE; 945 error = ext2_update(tdvp, 1); 946 if (error) 947 goto bad; 948 } 949 error = ext2_direnter(ip, tdvp, tcnp); 950 if (error) { 951 if (doingdirectory && newparent) { 952 dp->i_nlink--; 953 dp->i_flag |= IN_CHANGE; 954 (void)ext2_update(tdvp, 1); 955 } 956 goto bad; 957 } 958 vput(tdvp); 959 } else { 960 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 961 panic("ext2_rename: EXDEV"); 962 /* 963 * Short circuit rename(foo, foo). 964 */ 965 if (xp->i_number == ip->i_number) 966 panic("ext2_rename: same file"); 967 /* 968 * If the parent directory is "sticky", then the user must 969 * own the parent directory, or the destination of the rename, 970 * otherwise the destination may not be changed (except by 971 * root). This implements append-only directories. 972 */ 973 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 974 tcnp->cn_cred->cr_uid != dp->i_uid && 975 xp->i_uid != tcnp->cn_cred->cr_uid) { 976 error = EPERM; 977 goto bad; 978 } 979 /* 980 * Target must be empty if a directory and have no links 981 * to it. Also, ensure source and target are compatible 982 * (both directories, or both not directories). 983 */ 984 if ((xp->i_mode&IFMT) == IFDIR) { 985 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 986 xp->i_nlink > 2) { 987 error = ENOTEMPTY; 988 goto bad; 989 } 990 if (!doingdirectory) { 991 error = ENOTDIR; 992 goto bad; 993 } 994 cache_purge(tdvp); 995 } else if (doingdirectory) { 996 error = EISDIR; 997 goto bad; 998 } 999 error = ext2_dirrewrite(dp, ip, tcnp); 1000 if (error) 1001 goto bad; 1002 /* 1003 * If the target directory is in the same 1004 * directory as the source directory, 1005 * decrement the link count on the parent 1006 * of the target directory. 1007 */ 1008 if (doingdirectory && !newparent) { 1009 dp->i_nlink--; 1010 dp->i_flag |= IN_CHANGE; 1011 } 1012 vput(tdvp); 1013 /* 1014 * Adjust the link count of the target to 1015 * reflect the dirrewrite above. If this is 1016 * a directory it is empty and there are 1017 * no links to it, so we can squash the inode and 1018 * any space associated with it. We disallowed 1019 * renaming over top of a directory with links to 1020 * it above, as the remaining link would point to 1021 * a directory without "." or ".." entries. 1022 */ 1023 xp->i_nlink--; 1024 if (doingdirectory) { 1025 if (--xp->i_nlink != 0) 1026 panic("ext2_rename: linked directory"); 1027 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1028 tcnp->cn_cred, tcnp->cn_thread); 1029 } 1030 xp->i_flag |= IN_CHANGE; 1031 vput(tvp); 1032 xp = NULL; 1033 } 1034 1035 /* 1036 * 3) Unlink the source. 1037 */ 1038 fcnp->cn_flags &= ~MODMASK; 1039 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1040 VREF(fdvp); 1041 error = relookup(fdvp, &fvp, fcnp); 1042 if (error == 0) 1043 vrele(fdvp); 1044 if (fvp != NULL) { 1045 xp = VTOI(fvp); 1046 dp = VTOI(fdvp); 1047 } else { 1048 /* 1049 * From name has disappeared. 1050 */ 1051 if (doingdirectory) 1052 panic("ext2_rename: lost dir entry"); 1053 vrele(ap->a_fvp); 1054 return (0); 1055 } 1056 /* 1057 * Ensure that the directory entry still exists and has not 1058 * changed while the new name has been entered. If the source is 1059 * a file then the entry may have been unlinked or renamed. In 1060 * either case there is no further work to be done. If the source 1061 * is a directory then it cannot have been rmdir'ed; its link 1062 * count of three would cause a rmdir to fail with ENOTEMPTY. 1063 * The IN_RENAME flag ensures that it cannot be moved by another 1064 * rename. 1065 */ 1066 if (xp != ip) { 1067 if (doingdirectory) 1068 panic("ext2_rename: lost dir entry"); 1069 } else { 1070 /* 1071 * If the source is a directory with a 1072 * new parent, the link count of the old 1073 * parent directory must be decremented 1074 * and ".." set to point to the new parent. 1075 */ 1076 if (doingdirectory && newparent) { 1077 dp->i_nlink--; 1078 dp->i_flag |= IN_CHANGE; 1079 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1080 sizeof (struct dirtemplate), (off_t)0, 1081 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1082 tcnp->cn_cred, NOCRED, NULL, NULL); 1083 if (error == 0) { 1084 /* Like ufs little-endian: */ 1085 namlen = dirbuf.dotdot_type; 1086 if (namlen != 2 || 1087 dirbuf.dotdot_name[0] != '.' || 1088 dirbuf.dotdot_name[1] != '.') { 1089 ext2_dirbad(xp, (doff_t)12, 1090 "rename: mangled dir"); 1091 } else { 1092 dirbuf.dotdot_ino = newparent; 1093 (void) vn_rdwr(UIO_WRITE, fvp, 1094 (caddr_t)&dirbuf, 1095 sizeof (struct dirtemplate), 1096 (off_t)0, UIO_SYSSPACE, 1097 IO_NODELOCKED | IO_SYNC | 1098 IO_NOMACCHECK, tcnp->cn_cred, 1099 NOCRED, NULL, NULL); 1100 cache_purge(fdvp); 1101 } 1102 } 1103 } 1104 error = ext2_dirremove(fdvp, fcnp); 1105 if (!error) { 1106 xp->i_nlink--; 1107 xp->i_flag |= IN_CHANGE; 1108 } 1109 xp->i_flag &= ~IN_RENAME; 1110 } 1111 if (dp) 1112 vput(fdvp); 1113 if (xp) 1114 vput(fvp); 1115 vrele(ap->a_fvp); 1116 return (error); 1117 1118 bad: 1119 if (xp) 1120 vput(ITOV(xp)); 1121 vput(ITOV(dp)); 1122 out: 1123 if (doingdirectory) 1124 ip->i_flag &= ~IN_RENAME; 1125 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1126 ip->i_nlink--; 1127 ip->i_flag |= IN_CHANGE; 1128 ip->i_flag &= ~IN_RENAME; 1129 vput(fvp); 1130 } else 1131 vrele(fvp); 1132 return (error); 1133 } 1134 1135 /* 1136 * Mkdir system call 1137 */ 1138 static int 1139 ext2_mkdir(ap) 1140 struct vop_mkdir_args /* { 1141 struct vnode *a_dvp; 1142 struct vnode **a_vpp; 1143 struct componentname *a_cnp; 1144 struct vattr *a_vap; 1145 } */ *ap; 1146 { 1147 struct vnode *dvp = ap->a_dvp; 1148 struct vattr *vap = ap->a_vap; 1149 struct componentname *cnp = ap->a_cnp; 1150 struct inode *ip, *dp; 1151 struct vnode *tvp; 1152 struct dirtemplate dirtemplate, *dtp; 1153 int error, dmode; 1154 1155 #ifdef DIAGNOSTIC 1156 if ((cnp->cn_flags & HASBUF) == 0) 1157 panic("ext2_mkdir: no name"); 1158 #endif 1159 dp = VTOI(dvp); 1160 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1161 error = EMLINK; 1162 goto out; 1163 } 1164 dmode = vap->va_mode & 0777; 1165 dmode |= IFDIR; 1166 /* 1167 * Must simulate part of ext2_makeinode here to acquire the inode, 1168 * but not have it entered in the parent directory. The entry is 1169 * made later after writing "." and ".." entries. 1170 */ 1171 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1172 if (error) 1173 goto out; 1174 ip = VTOI(tvp); 1175 ip->i_gid = dp->i_gid; 1176 #ifdef SUIDDIR 1177 { 1178 /* 1179 * if we are hacking owners here, (only do this where told to) 1180 * and we are not giving it TOO root, (would subvert quotas) 1181 * then go ahead and give it to the other user. 1182 * The new directory also inherits the SUID bit. 1183 * If user's UID and dir UID are the same, 1184 * 'give it away' so that the SUID is still forced on. 1185 */ 1186 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1187 (dp->i_mode & ISUID) && dp->i_uid) { 1188 dmode |= ISUID; 1189 ip->i_uid = dp->i_uid; 1190 } else { 1191 ip->i_uid = cnp->cn_cred->cr_uid; 1192 } 1193 } 1194 #else 1195 ip->i_uid = cnp->cn_cred->cr_uid; 1196 #endif 1197 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1198 ip->i_mode = dmode; 1199 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1200 ip->i_nlink = 2; 1201 if (cnp->cn_flags & ISWHITEOUT) 1202 ip->i_flags |= UF_OPAQUE; 1203 error = ext2_update(tvp, 1); 1204 1205 /* 1206 * Bump link count in parent directory 1207 * to reflect work done below. Should 1208 * be done before reference is created 1209 * so reparation is possible if we crash. 1210 */ 1211 dp->i_nlink++; 1212 dp->i_flag |= IN_CHANGE; 1213 error = ext2_update(dvp, 1); 1214 if (error) 1215 goto bad; 1216 1217 /* Initialize directory with "." and ".." from static template. */ 1218 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1219 EXT2F_INCOMPAT_FTYPE)) 1220 dtp = &mastertemplate; 1221 else 1222 dtp = &omastertemplate; 1223 dirtemplate = *dtp; 1224 dirtemplate.dot_ino = ip->i_number; 1225 dirtemplate.dotdot_ino = dp->i_number; 1226 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1227 * so let's just redefine it - for this function only 1228 */ 1229 #undef DIRBLKSIZ 1230 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1231 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1232 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1233 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, 1234 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1235 NULL, NULL); 1236 if (error) { 1237 dp->i_nlink--; 1238 dp->i_flag |= IN_CHANGE; 1239 goto bad; 1240 } 1241 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1242 /* XXX should grow with balloc() */ 1243 panic("ext2_mkdir: blksize"); 1244 else { 1245 ip->i_size = DIRBLKSIZ; 1246 ip->i_flag |= IN_CHANGE; 1247 } 1248 1249 /* Directory set up, now install its entry in the parent directory. */ 1250 error = ext2_direnter(ip, dvp, cnp); 1251 if (error) { 1252 dp->i_nlink--; 1253 dp->i_flag |= IN_CHANGE; 1254 } 1255 bad: 1256 /* 1257 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1258 * for us because we set the link count to 0. 1259 */ 1260 if (error) { 1261 ip->i_nlink = 0; 1262 ip->i_flag |= IN_CHANGE; 1263 vput(tvp); 1264 } else 1265 *ap->a_vpp = tvp; 1266 out: 1267 return (error); 1268 #undef DIRBLKSIZ 1269 #define DIRBLKSIZ DEV_BSIZE 1270 } 1271 1272 /* 1273 * Rmdir system call. 1274 */ 1275 static int 1276 ext2_rmdir(ap) 1277 struct vop_rmdir_args /* { 1278 struct vnode *a_dvp; 1279 struct vnode *a_vp; 1280 struct componentname *a_cnp; 1281 } */ *ap; 1282 { 1283 struct vnode *vp = ap->a_vp; 1284 struct vnode *dvp = ap->a_dvp; 1285 struct componentname *cnp = ap->a_cnp; 1286 struct inode *ip, *dp; 1287 int error; 1288 1289 ip = VTOI(vp); 1290 dp = VTOI(dvp); 1291 1292 /* 1293 * Verify the directory is empty (and valid). 1294 * (Rmdir ".." won't be valid since 1295 * ".." will contain a reference to 1296 * the current directory and thus be 1297 * non-empty.) 1298 */ 1299 error = 0; 1300 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1301 error = ENOTEMPTY; 1302 goto out; 1303 } 1304 if ((dp->i_flags & APPEND) 1305 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1306 error = EPERM; 1307 goto out; 1308 } 1309 /* 1310 * Delete reference to directory before purging 1311 * inode. If we crash in between, the directory 1312 * will be reattached to lost+found, 1313 */ 1314 error = ext2_dirremove(dvp, cnp); 1315 if (error) 1316 goto out; 1317 dp->i_nlink--; 1318 dp->i_flag |= IN_CHANGE; 1319 cache_purge(dvp); 1320 VOP_UNLOCK(dvp, 0); 1321 /* 1322 * Truncate inode. The only stuff left 1323 * in the directory is "." and "..". The 1324 * "." reference is inconsequential since 1325 * we're quashing it. The ".." reference 1326 * has already been adjusted above. We've 1327 * removed the "." reference and the reference 1328 * in the parent directory, but there may be 1329 * other hard links so decrement by 2 and 1330 * worry about them later. 1331 */ 1332 ip->i_nlink -= 2; 1333 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1334 cnp->cn_thread); 1335 cache_purge(ITOV(ip)); 1336 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1337 out: 1338 return (error); 1339 } 1340 1341 /* 1342 * symlink -- make a symbolic link 1343 */ 1344 static int 1345 ext2_symlink(ap) 1346 struct vop_symlink_args /* { 1347 struct vnode *a_dvp; 1348 struct vnode **a_vpp; 1349 struct componentname *a_cnp; 1350 struct vattr *a_vap; 1351 char *a_target; 1352 } */ *ap; 1353 { 1354 struct vnode *vp, **vpp = ap->a_vpp; 1355 struct inode *ip; 1356 int len, error; 1357 1358 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1359 vpp, ap->a_cnp); 1360 if (error) 1361 return (error); 1362 vp = *vpp; 1363 len = strlen(ap->a_target); 1364 if (len < vp->v_mount->mnt_maxsymlinklen) { 1365 ip = VTOI(vp); 1366 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1367 ip->i_size = len; 1368 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1369 } else 1370 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1371 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1372 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1373 if (error) 1374 vput(vp); 1375 return (error); 1376 } 1377 1378 /* 1379 * Return target name of a symbolic link 1380 */ 1381 static int 1382 ext2_readlink(ap) 1383 struct vop_readlink_args /* { 1384 struct vnode *a_vp; 1385 struct uio *a_uio; 1386 struct ucred *a_cred; 1387 } */ *ap; 1388 { 1389 struct vnode *vp = ap->a_vp; 1390 struct inode *ip = VTOI(vp); 1391 int isize; 1392 1393 isize = ip->i_size; 1394 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1395 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1396 return (0); 1397 } 1398 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1399 } 1400 1401 /* 1402 * Calculate the logical to physical mapping if not done already, 1403 * then call the device strategy routine. 1404 * 1405 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1406 * deadlock on memory. See ext2_bmap() for details. 1407 */ 1408 static int 1409 ext2_strategy(ap) 1410 struct vop_strategy_args /* { 1411 struct vnode *a_vp; 1412 struct buf *a_bp; 1413 } */ *ap; 1414 { 1415 struct buf *bp = ap->a_bp; 1416 struct vnode *vp = ap->a_vp; 1417 struct inode *ip; 1418 struct bufobj *bo; 1419 int32_t blkno; 1420 int error; 1421 1422 ip = VTOI(vp); 1423 if (vp->v_type == VBLK || vp->v_type == VCHR) 1424 panic("ext2_strategy: spec"); 1425 if (bp->b_blkno == bp->b_lblkno) { 1426 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1427 bp->b_blkno = blkno; 1428 if (error) { 1429 bp->b_error = error; 1430 bp->b_ioflags |= BIO_ERROR; 1431 bufdone(bp); 1432 return (0); 1433 } 1434 if ((long)bp->b_blkno == -1) 1435 vfs_bio_clrbuf(bp); 1436 } 1437 if ((long)bp->b_blkno == -1) { 1438 bufdone(bp); 1439 return (0); 1440 } 1441 bp->b_iooffset = dbtob(bp->b_blkno); 1442 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1443 BO_STRATEGY(bo, bp); 1444 return (0); 1445 } 1446 1447 /* 1448 * Print out the contents of an inode. 1449 */ 1450 static int 1451 ext2_print(ap) 1452 struct vop_print_args /* { 1453 struct vnode *a_vp; 1454 } */ *ap; 1455 { 1456 struct vnode *vp = ap->a_vp; 1457 struct inode *ip = VTOI(vp); 1458 1459 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number); 1460 if (vp->v_type == VFIFO) 1461 fifo_printinfo(vp); 1462 printf("\n"); 1463 return (0); 1464 } 1465 1466 /* 1467 * Close wrapper for fifos. 1468 * 1469 * Update the times on the inode then do device close. 1470 */ 1471 static int 1472 ext2fifo_close(ap) 1473 struct vop_close_args /* { 1474 struct vnode *a_vp; 1475 int a_fflag; 1476 struct ucred *a_cred; 1477 struct thread *a_td; 1478 } */ *ap; 1479 { 1480 struct vnode *vp = ap->a_vp; 1481 1482 VI_LOCK(vp); 1483 if (vp->v_usecount > 1) 1484 ext2_itimes_locked(vp); 1485 VI_UNLOCK(vp); 1486 return (fifo_specops.vop_close(ap)); 1487 } 1488 1489 /* 1490 * Kqfilter wrapper for fifos. 1491 * 1492 * Fall through to ext2 kqfilter routines if needed 1493 */ 1494 static int 1495 ext2fifo_kqfilter(ap) 1496 struct vop_kqfilter_args *ap; 1497 { 1498 int error; 1499 1500 error = fifo_specops.vop_kqfilter(ap); 1501 if (error) 1502 error = vfs_kqfilter(ap); 1503 return (error); 1504 } 1505 1506 /* 1507 * Return POSIX pathconf information applicable to ext2 filesystems. 1508 */ 1509 static int 1510 ext2_pathconf(ap) 1511 struct vop_pathconf_args /* { 1512 struct vnode *a_vp; 1513 int a_name; 1514 int *a_retval; 1515 } */ *ap; 1516 { 1517 1518 switch (ap->a_name) { 1519 case _PC_LINK_MAX: 1520 *ap->a_retval = LINK_MAX; 1521 return (0); 1522 case _PC_NAME_MAX: 1523 *ap->a_retval = NAME_MAX; 1524 return (0); 1525 case _PC_PATH_MAX: 1526 *ap->a_retval = PATH_MAX; 1527 return (0); 1528 case _PC_PIPE_BUF: 1529 *ap->a_retval = PIPE_BUF; 1530 return (0); 1531 case _PC_CHOWN_RESTRICTED: 1532 *ap->a_retval = 1; 1533 return (0); 1534 case _PC_NO_TRUNC: 1535 *ap->a_retval = 1; 1536 return (0); 1537 default: 1538 return (EINVAL); 1539 } 1540 /* NOTREACHED */ 1541 } 1542 1543 /* 1544 * Vnode pointer to File handle 1545 */ 1546 /* ARGSUSED */ 1547 static int 1548 ext2_vptofh(ap) 1549 struct vop_vptofh_args /* { 1550 struct vnode *a_vp; 1551 struct fid *a_fhp; 1552 } */ *ap; 1553 { 1554 struct inode *ip; 1555 struct ufid *ufhp; 1556 1557 ip = VTOI(ap->a_vp); 1558 ufhp = (struct ufid *)ap->a_fhp; 1559 ufhp->ufid_len = sizeof(struct ufid); 1560 ufhp->ufid_ino = ip->i_number; 1561 ufhp->ufid_gen = ip->i_gen; 1562 return (0); 1563 } 1564 1565 /* 1566 * Initialize the vnode associated with a new inode, handle aliased 1567 * vnodes. 1568 */ 1569 int 1570 ext2_vinit(mntp, fifoops, vpp) 1571 struct mount *mntp; 1572 struct vop_vector *fifoops; 1573 struct vnode **vpp; 1574 { 1575 struct inode *ip; 1576 struct vnode *vp; 1577 1578 vp = *vpp; 1579 ip = VTOI(vp); 1580 vp->v_type = IFTOVT(ip->i_mode); 1581 if (vp->v_type == VFIFO) 1582 vp->v_op = fifoops; 1583 1584 if (ip->i_number == ROOTINO) 1585 vp->v_vflag |= VV_ROOT; 1586 ip->i_modrev = init_va_filerev(); 1587 *vpp = vp; 1588 return (0); 1589 } 1590 1591 /* 1592 * Allocate a new inode. 1593 */ 1594 static int 1595 ext2_makeinode(mode, dvp, vpp, cnp) 1596 int mode; 1597 struct vnode *dvp; 1598 struct vnode **vpp; 1599 struct componentname *cnp; 1600 { 1601 struct inode *ip, *pdir; 1602 struct vnode *tvp; 1603 int error; 1604 1605 pdir = VTOI(dvp); 1606 #ifdef DIAGNOSTIC 1607 if ((cnp->cn_flags & HASBUF) == 0) 1608 panic("ext2_makeinode: no name"); 1609 #endif 1610 *vpp = NULL; 1611 if ((mode & IFMT) == 0) 1612 mode |= IFREG; 1613 1614 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1615 if (error) { 1616 return (error); 1617 } 1618 ip = VTOI(tvp); 1619 ip->i_gid = pdir->i_gid; 1620 #ifdef SUIDDIR 1621 { 1622 /* 1623 * if we are 1624 * not the owner of the directory, 1625 * and we are hacking owners here, (only do this where told to) 1626 * and we are not giving it TOO root, (would subvert quotas) 1627 * then go ahead and give it to the other user. 1628 * Note that this drops off the execute bits for security. 1629 */ 1630 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1631 (pdir->i_mode & ISUID) && 1632 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1633 ip->i_uid = pdir->i_uid; 1634 mode &= ~07111; 1635 } else { 1636 ip->i_uid = cnp->cn_cred->cr_uid; 1637 } 1638 } 1639 #else 1640 ip->i_uid = cnp->cn_cred->cr_uid; 1641 #endif 1642 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1643 ip->i_mode = mode; 1644 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1645 ip->i_nlink = 1; 1646 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1647 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1648 ip->i_mode &= ~ISGID; 1649 } 1650 1651 if (cnp->cn_flags & ISWHITEOUT) 1652 ip->i_flags |= UF_OPAQUE; 1653 1654 /* 1655 * Make sure inode goes to disk before directory entry. 1656 */ 1657 error = ext2_update(tvp, 1); 1658 if (error) 1659 goto bad; 1660 error = ext2_direnter(ip, dvp, cnp); 1661 if (error) 1662 goto bad; 1663 1664 *vpp = tvp; 1665 return (0); 1666 1667 bad: 1668 /* 1669 * Write error occurred trying to update the inode 1670 * or the directory so must deallocate the inode. 1671 */ 1672 ip->i_nlink = 0; 1673 ip->i_flag |= IN_CHANGE; 1674 vput(tvp); 1675 return (error); 1676 } 1677