ufs_vnops.c revision 50253
1/* 2 * Copyright (c) 1982, 1986, 1989, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 39 * $Id: ufs_vnops.c,v 1.120 1999/08/22 00:15:16 jdp Exp $ 40 */ 41 42#include "opt_quota.h" 43#include "opt_suiddir.h" 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/namei.h> 48#include <sys/kernel.h> 49#include <sys/fcntl.h> 50#include <sys/stat.h> 51#include <sys/buf.h> 52#include <sys/proc.h> 53#include <sys/mount.h> 54#include <sys/unistd.h> 55#include <sys/vnode.h> 56#include <sys/malloc.h> 57#include <sys/dirent.h> 58#include <sys/lockf.h> 59#include <sys/poll.h> 60#include <sys/conf.h> 61 62#include <vm/vm_zone.h> 63#include <vm/vm.h> 64#include <vm/vm_extern.h> 65 66#include <miscfs/fifofs/fifo.h> 67 68#include <ufs/ufs/quota.h> 69#include <ufs/ufs/inode.h> 70#include <ufs/ufs/dir.h> 71#include <ufs/ufs/ufsmount.h> 72#include <ufs/ufs/ufs_extern.h> 73 74static int ufs_abortop __P((struct vop_abortop_args *)); 75static int ufs_access __P((struct vop_access_args *)); 76static int ufs_advlock __P((struct vop_advlock_args *)); 77static int ufs_chmod __P((struct vnode *, int, struct ucred *, struct proc *)); 78static int ufs_chown __P((struct vnode *, uid_t, gid_t, struct ucred *, struct proc *)); 79static int ufs_close __P((struct vop_close_args *)); 80static int ufs_create __P((struct vop_create_args *)); 81static int ufs_getattr __P((struct vop_getattr_args *)); 82static int ufs_link __P((struct vop_link_args *)); 83static int ufs_makeinode __P((int mode, struct vnode *, struct vnode **, struct componentname *)); 84static int ufs_missingop __P((struct vop_generic_args *ap)); 85static int ufs_mkdir __P((struct vop_mkdir_args *)); 86static int ufs_mknod __P((struct vop_mknod_args *)); 87static int ufs_mmap __P((struct vop_mmap_args *)); 88static int ufs_open __P((struct vop_open_args *)); 89static int ufs_pathconf __P((struct vop_pathconf_args *)); 90static int ufs_print __P((struct vop_print_args *)); 91static int ufs_readdir __P((struct vop_readdir_args *)); 92static int ufs_readlink __P((struct vop_readlink_args *)); 93static int ufs_remove __P((struct vop_remove_args *)); 94static int ufs_rename __P((struct vop_rename_args *)); 95static int ufs_rmdir __P((struct vop_rmdir_args *)); 96static int ufs_setattr __P((struct vop_setattr_args *)); 97static int ufs_strategy __P((struct vop_strategy_args *)); 98static int ufs_symlink __P((struct vop_symlink_args *)); 99static int ufs_whiteout __P((struct vop_whiteout_args *)); 100static int ufsfifo_close __P((struct vop_close_args *)); 101static int ufsfifo_read __P((struct vop_read_args *)); 102static int ufsfifo_write __P((struct vop_write_args *)); 103static int ufsspec_close __P((struct vop_close_args *)); 104static int ufsspec_read __P((struct vop_read_args *)); 105static int ufsspec_write __P((struct vop_write_args *)); 106 107union _qcvt { 108 int64_t qcvt; 109 int32_t val[2]; 110}; 111#define SETHIGH(q, h) { \ 112 union _qcvt tmp; \ 113 tmp.qcvt = (q); \ 114 tmp.val[_QUAD_HIGHWORD] = (h); \ 115 (q) = tmp.qcvt; \ 116} 117#define SETLOW(q, l) { \ 118 union _qcvt tmp; \ 119 tmp.qcvt = (q); \ 120 tmp.val[_QUAD_LOWWORD] = (l); \ 121 (q) = tmp.qcvt; \ 122} 123 124/* 125 * A virgin directory (no blushing please). 126 */ 127static struct dirtemplate mastertemplate = { 128 0, 12, DT_DIR, 1, ".", 129 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." 130}; 131static struct odirtemplate omastertemplate = { 132 0, 12, 1, ".", 133 0, DIRBLKSIZ - 12, 2, ".." 134}; 135 136void 137ufs_itimes(vp) 138 struct vnode *vp; 139{ 140 struct inode *ip; 141 struct timespec ts; 142 143 ip = VTOI(vp); 144 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 145 return; 146 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 147 vfs_timestamp(&ts); 148 if ((vp->v_type == VBLK || vp->v_type == VCHR) && 149 !DOINGSOFTDEP(vp)) 150 ip->i_flag |= IN_LAZYMOD; 151 else 152 ip->i_flag |= IN_MODIFIED; 153 if (ip->i_flag & IN_ACCESS) { 154 ip->i_atime = ts.tv_sec; 155 ip->i_atimensec = ts.tv_nsec; 156 } 157 if (ip->i_flag & IN_UPDATE) { 158 ip->i_mtime = ts.tv_sec; 159 ip->i_mtimensec = ts.tv_nsec; 160 ip->i_modrev++; 161 } 162 if (ip->i_flag & IN_CHANGE) { 163 ip->i_ctime = ts.tv_sec; 164 ip->i_ctimensec = ts.tv_nsec; 165 } 166 } 167 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 168} 169 170/* 171 * Create a regular file 172 */ 173int 174ufs_create(ap) 175 struct vop_create_args /* { 176 struct vnode *a_dvp; 177 struct vnode **a_vpp; 178 struct componentname *a_cnp; 179 struct vattr *a_vap; 180 } */ *ap; 181{ 182 int error; 183 184 error = 185 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 186 ap->a_dvp, ap->a_vpp, ap->a_cnp); 187 if (error) 188 return (error); 189 VN_POLLEVENT(ap->a_dvp, POLLWRITE); 190 return (0); 191} 192 193/* 194 * Mknod vnode call 195 */ 196/* ARGSUSED */ 197int 198ufs_mknod(ap) 199 struct vop_mknod_args /* { 200 struct vnode *a_dvp; 201 struct vnode **a_vpp; 202 struct componentname *a_cnp; 203 struct vattr *a_vap; 204 } */ *ap; 205{ 206 struct vattr *vap = ap->a_vap; 207 struct vnode **vpp = ap->a_vpp; 208 struct inode *ip; 209 int error; 210 211 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 212 ap->a_dvp, vpp, ap->a_cnp); 213 if (error) 214 return (error); 215 VN_POLLEVENT(ap->a_dvp, POLLWRITE); 216 ip = VTOI(*vpp); 217 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 218 if (vap->va_rdev != VNOVAL) { 219 /* 220 * Want to be able to use this to make badblock 221 * inodes, so don't truncate the dev number. 222 */ 223 ip->i_rdev = vap->va_rdev; 224 } 225 /* 226 * Remove inode so that it will be reloaded by VFS_VGET and 227 * checked to see if it is an alias of an existing entry in 228 * the inode cache. 229 */ 230 vput(*vpp); 231 (*vpp)->v_type = VNON; 232 vgone(*vpp); 233 *vpp = 0; 234 return (0); 235} 236 237/* 238 * Open called. 239 * 240 * Nothing to do. 241 */ 242/* ARGSUSED */ 243int 244ufs_open(ap) 245 struct vop_open_args /* { 246 struct vnode *a_vp; 247 int a_mode; 248 struct ucred *a_cred; 249 struct proc *a_p; 250 } */ *ap; 251{ 252 253 /* 254 * Files marked append-only must be opened for appending. 255 */ 256 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 257 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 258 return (EPERM); 259 return (0); 260} 261 262/* 263 * Close called. 264 * 265 * Update the times on the inode. 266 */ 267/* ARGSUSED */ 268int 269ufs_close(ap) 270 struct vop_close_args /* { 271 struct vnode *a_vp; 272 int a_fflag; 273 struct ucred *a_cred; 274 struct proc *a_p; 275 } */ *ap; 276{ 277 register struct vnode *vp = ap->a_vp; 278 279 simple_lock(&vp->v_interlock); 280 if (vp->v_usecount > 1) 281 ufs_itimes(vp); 282 simple_unlock(&vp->v_interlock); 283 return (0); 284} 285 286int 287ufs_access(ap) 288 struct vop_access_args /* { 289 struct vnode *a_vp; 290 int a_mode; 291 struct ucred *a_cred; 292 struct proc *a_p; 293 } */ *ap; 294{ 295 struct vnode *vp = ap->a_vp; 296 struct inode *ip = VTOI(vp); 297 struct ucred *cred = ap->a_cred; 298 mode_t mask, mode = ap->a_mode; 299 register gid_t *gp; 300 int i; 301#ifdef QUOTA 302 int error; 303#endif 304 305 /* 306 * Disallow write attempts on read-only file systems; 307 * unless the file is a socket, fifo, or a block or 308 * character device resident on the file system. 309 */ 310 if (mode & VWRITE) { 311 switch (vp->v_type) { 312 case VDIR: 313 case VLNK: 314 case VREG: 315 if (vp->v_mount->mnt_flag & MNT_RDONLY) 316 return (EROFS); 317#ifdef QUOTA 318 if ((error = getinoquota(ip)) != 0) 319 return (error); 320#endif 321 break; 322 default: 323 break; 324 } 325 } 326 327 /* If immutable bit set, nobody gets to write it. */ 328 if ((mode & VWRITE) && (ip->i_flags & IMMUTABLE)) 329 return (EPERM); 330 331 /* Otherwise, user id 0 always gets access. */ 332 if (cred->cr_uid == 0) 333 return (0); 334 335 mask = 0; 336 337 /* Otherwise, check the owner. */ 338 if (cred->cr_uid == ip->i_uid) { 339 if (mode & VEXEC) 340 mask |= S_IXUSR; 341 if (mode & VREAD) 342 mask |= S_IRUSR; 343 if (mode & VWRITE) 344 mask |= S_IWUSR; 345 return ((ip->i_mode & mask) == mask ? 0 : EACCES); 346 } 347 348 /* Otherwise, check the groups. */ 349 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++) 350 if (ip->i_gid == *gp) { 351 if (mode & VEXEC) 352 mask |= S_IXGRP; 353 if (mode & VREAD) 354 mask |= S_IRGRP; 355 if (mode & VWRITE) 356 mask |= S_IWGRP; 357 return ((ip->i_mode & mask) == mask ? 0 : EACCES); 358 } 359 360 /* Otherwise, check everyone else. */ 361 if (mode & VEXEC) 362 mask |= S_IXOTH; 363 if (mode & VREAD) 364 mask |= S_IROTH; 365 if (mode & VWRITE) 366 mask |= S_IWOTH; 367 return ((ip->i_mode & mask) == mask ? 0 : EACCES); 368} 369 370/* ARGSUSED */ 371int 372ufs_getattr(ap) 373 struct vop_getattr_args /* { 374 struct vnode *a_vp; 375 struct vattr *a_vap; 376 struct ucred *a_cred; 377 struct proc *a_p; 378 } */ *ap; 379{ 380 register struct vnode *vp = ap->a_vp; 381 register struct inode *ip = VTOI(vp); 382 register struct vattr *vap = ap->a_vap; 383 384 ufs_itimes(vp); 385 /* 386 * Copy from inode table 387 */ 388 vap->va_fsid = dev2udev(ip->i_dev); 389 vap->va_fileid = ip->i_number; 390 vap->va_mode = ip->i_mode & ~IFMT; 391 vap->va_nlink = ip->i_effnlink; 392 vap->va_uid = ip->i_uid; 393 vap->va_gid = ip->i_gid; 394 vap->va_rdev = ip->i_rdev; 395 vap->va_size = ip->i_din.di_size; 396 vap->va_atime.tv_sec = ip->i_atime; 397 vap->va_atime.tv_nsec = ip->i_atimensec; 398 vap->va_mtime.tv_sec = ip->i_mtime; 399 vap->va_mtime.tv_nsec = ip->i_mtimensec; 400 vap->va_ctime.tv_sec = ip->i_ctime; 401 vap->va_ctime.tv_nsec = ip->i_ctimensec; 402 vap->va_flags = ip->i_flags; 403 vap->va_gen = ip->i_gen; 404 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 405 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 406 vap->va_type = IFTOVT(ip->i_mode); 407 vap->va_filerev = ip->i_modrev; 408 return (0); 409} 410 411/* 412 * Set attribute vnode op. called from several syscalls 413 */ 414int 415ufs_setattr(ap) 416 struct vop_setattr_args /* { 417 struct vnode *a_vp; 418 struct vattr *a_vap; 419 struct ucred *a_cred; 420 struct proc *a_p; 421 } */ *ap; 422{ 423 struct vattr *vap = ap->a_vap; 424 struct vnode *vp = ap->a_vp; 425 struct inode *ip = VTOI(vp); 426 struct ucred *cred = ap->a_cred; 427 struct proc *p = ap->a_p; 428 int error; 429 430 /* 431 * Check for unsettable attributes. 432 */ 433 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 434 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 435 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 436 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 437 return (EINVAL); 438 } 439 if (vap->va_flags != VNOVAL) { 440 if (vp->v_mount->mnt_flag & MNT_RDONLY) 441 return (EROFS); 442 if (cred->cr_uid != ip->i_uid && 443 (error = suser_xxx(cred, p, PRISON_ROOT))) 444 return (error); 445 if (cred->cr_uid == 0) { 446 if ((ip->i_flags 447 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) && 448 securelevel > 0) 449 return (EPERM); 450 ip->i_flags = vap->va_flags; 451 } else { 452 if (ip->i_flags 453 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 454 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 455 return (EPERM); 456 ip->i_flags &= SF_SETTABLE; 457 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 458 } 459 ip->i_flag |= IN_CHANGE; 460 if (vap->va_flags & (IMMUTABLE | APPEND)) 461 return (0); 462 } 463 if (ip->i_flags & (IMMUTABLE | APPEND)) 464 return (EPERM); 465 /* 466 * Go through the fields and update iff not VNOVAL. 467 */ 468 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 469 if (vp->v_mount->mnt_flag & MNT_RDONLY) 470 return (EROFS); 471 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p)) != 0) 472 return (error); 473 } 474 if (vap->va_size != VNOVAL) { 475 /* 476 * Disallow write attempts on read-only file systems; 477 * unless the file is a socket, fifo, or a block or 478 * character device resident on the file system. 479 */ 480 switch (vp->v_type) { 481 case VDIR: 482 return (EISDIR); 483 case VLNK: 484 case VREG: 485 if (vp->v_mount->mnt_flag & MNT_RDONLY) 486 return (EROFS); 487 break; 488 default: 489 break; 490 } 491 if ((error = UFS_TRUNCATE(vp, vap->va_size, 0, cred, p)) != 0) 492 return (error); 493 } 494 ip = VTOI(vp); 495 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 496 if (vp->v_mount->mnt_flag & MNT_RDONLY) 497 return (EROFS); 498 if (cred->cr_uid != ip->i_uid && 499 (error = suser_xxx(cred, p, PRISON_ROOT)) && 500 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 501 (error = VOP_ACCESS(vp, VWRITE, cred, p)))) 502 return (error); 503 if (vap->va_atime.tv_sec != VNOVAL) 504 ip->i_flag |= IN_ACCESS; 505 if (vap->va_mtime.tv_sec != VNOVAL) 506 ip->i_flag |= IN_CHANGE | IN_UPDATE; 507 ufs_itimes(vp); 508 if (vap->va_atime.tv_sec != VNOVAL) { 509 ip->i_atime = vap->va_atime.tv_sec; 510 ip->i_atimensec = vap->va_atime.tv_nsec; 511 } 512 if (vap->va_mtime.tv_sec != VNOVAL) { 513 ip->i_mtime = vap->va_mtime.tv_sec; 514 ip->i_mtimensec = vap->va_mtime.tv_nsec; 515 } 516 error = UFS_UPDATE(vp, 0); 517 if (error) 518 return (error); 519 } 520 error = 0; 521 if (vap->va_mode != (mode_t)VNOVAL) { 522 if (vp->v_mount->mnt_flag & MNT_RDONLY) 523 return (EROFS); 524 error = ufs_chmod(vp, (int)vap->va_mode, cred, p); 525 } 526 VN_POLLEVENT(vp, POLLATTRIB); 527 return (error); 528} 529 530/* 531 * Change the mode on a file. 532 * Inode must be locked before calling. 533 */ 534static int 535ufs_chmod(vp, mode, cred, p) 536 register struct vnode *vp; 537 register int mode; 538 register struct ucred *cred; 539 struct proc *p; 540{ 541 register struct inode *ip = VTOI(vp); 542 int error; 543 544 if (cred->cr_uid != ip->i_uid) { 545 error = suser_xxx(cred, p, PRISON_ROOT); 546 if (error) 547 return (error); 548 } 549 if (cred->cr_uid) { 550 if (vp->v_type != VDIR && (mode & S_ISTXT)) 551 return (EFTYPE); 552 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) 553 return (EPERM); 554 } 555 ip->i_mode &= ~ALLPERMS; 556 ip->i_mode |= (mode & ALLPERMS); 557 ip->i_flag |= IN_CHANGE; 558 return (0); 559} 560 561/* 562 * Perform chown operation on inode ip; 563 * inode must be locked prior to call. 564 */ 565static int 566ufs_chown(vp, uid, gid, cred, p) 567 register struct vnode *vp; 568 uid_t uid; 569 gid_t gid; 570 struct ucred *cred; 571 struct proc *p; 572{ 573 register struct inode *ip = VTOI(vp); 574 uid_t ouid; 575 gid_t ogid; 576 int error = 0; 577#ifdef QUOTA 578 register int i; 579 long change; 580#endif 581 582 if (uid == (uid_t)VNOVAL) 583 uid = ip->i_uid; 584 if (gid == (gid_t)VNOVAL) 585 gid = ip->i_gid; 586 /* 587 * If we don't own the file, are trying to change the owner 588 * of the file, or are not a member of the target group, 589 * the caller must be superuser or the call fails. 590 */ 591 if ((cred->cr_uid != ip->i_uid || uid != ip->i_uid || 592 (gid != ip->i_gid && !groupmember((gid_t)gid, cred))) && 593 (error = suser_xxx(cred, p, PRISON_ROOT))) 594 return (error); 595 ogid = ip->i_gid; 596 ouid = ip->i_uid; 597#ifdef QUOTA 598 if ((error = getinoquota(ip)) != 0) 599 return (error); 600 if (ouid == uid) { 601 dqrele(vp, ip->i_dquot[USRQUOTA]); 602 ip->i_dquot[USRQUOTA] = NODQUOT; 603 } 604 if (ogid == gid) { 605 dqrele(vp, ip->i_dquot[GRPQUOTA]); 606 ip->i_dquot[GRPQUOTA] = NODQUOT; 607 } 608 change = ip->i_blocks; 609 (void) chkdq(ip, -change, cred, CHOWN); 610 (void) chkiq(ip, -1, cred, CHOWN); 611 for (i = 0; i < MAXQUOTAS; i++) { 612 dqrele(vp, ip->i_dquot[i]); 613 ip->i_dquot[i] = NODQUOT; 614 } 615#endif 616 ip->i_gid = gid; 617 ip->i_uid = uid; 618#ifdef QUOTA 619 if ((error = getinoquota(ip)) == 0) { 620 if (ouid == uid) { 621 dqrele(vp, ip->i_dquot[USRQUOTA]); 622 ip->i_dquot[USRQUOTA] = NODQUOT; 623 } 624 if (ogid == gid) { 625 dqrele(vp, ip->i_dquot[GRPQUOTA]); 626 ip->i_dquot[GRPQUOTA] = NODQUOT; 627 } 628 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 629 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 630 goto good; 631 else 632 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 633 } 634 for (i = 0; i < MAXQUOTAS; i++) { 635 dqrele(vp, ip->i_dquot[i]); 636 ip->i_dquot[i] = NODQUOT; 637 } 638 } 639 ip->i_gid = ogid; 640 ip->i_uid = ouid; 641 if (getinoquota(ip) == 0) { 642 if (ouid == uid) { 643 dqrele(vp, ip->i_dquot[USRQUOTA]); 644 ip->i_dquot[USRQUOTA] = NODQUOT; 645 } 646 if (ogid == gid) { 647 dqrele(vp, ip->i_dquot[GRPQUOTA]); 648 ip->i_dquot[GRPQUOTA] = NODQUOT; 649 } 650 (void) chkdq(ip, change, cred, FORCE|CHOWN); 651 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 652 (void) getinoquota(ip); 653 } 654 return (error); 655good: 656 if (getinoquota(ip)) 657 panic("ufs_chown: lost quota"); 658#endif /* QUOTA */ 659 ip->i_flag |= IN_CHANGE; 660 if (cred->cr_uid != 0 && (ouid != uid || ogid != gid)) 661 ip->i_mode &= ~(ISUID | ISGID); 662 return (0); 663} 664 665/* 666 * Mmap a file 667 * 668 * NB Currently unsupported. 669 */ 670/* ARGSUSED */ 671int 672ufs_mmap(ap) 673 struct vop_mmap_args /* { 674 struct vnode *a_vp; 675 int a_fflags; 676 struct ucred *a_cred; 677 struct proc *a_p; 678 } */ *ap; 679{ 680 681 return (EINVAL); 682} 683 684int 685ufs_remove(ap) 686 struct vop_remove_args /* { 687 struct vnode *a_dvp; 688 struct vnode *a_vp; 689 struct componentname *a_cnp; 690 } */ *ap; 691{ 692 struct inode *ip; 693 struct vnode *vp = ap->a_vp; 694 struct vnode *dvp = ap->a_dvp; 695 int error; 696 697 ip = VTOI(vp); 698 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 699 (VTOI(dvp)->i_flags & APPEND)) { 700 error = EPERM; 701 goto out; 702 } 703 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 704 VN_POLLEVENT(vp, POLLNLINK); 705 VN_POLLEVENT(dvp, POLLWRITE); 706out: 707 return (error); 708} 709 710/* 711 * link vnode call 712 */ 713int 714ufs_link(ap) 715 struct vop_link_args /* { 716 struct vnode *a_tdvp; 717 struct vnode *a_vp; 718 struct componentname *a_cnp; 719 } */ *ap; 720{ 721 struct vnode *vp = ap->a_vp; 722 struct vnode *tdvp = ap->a_tdvp; 723 struct componentname *cnp = ap->a_cnp; 724 struct proc *p = cnp->cn_proc; 725 struct inode *ip; 726 struct direct newdir; 727 int error; 728 729#ifdef DIAGNOSTIC 730 if ((cnp->cn_flags & HASBUF) == 0) 731 panic("ufs_link: no name"); 732#endif 733 if (tdvp->v_mount != vp->v_mount) { 734 VOP_ABORTOP(tdvp, cnp); 735 error = EXDEV; 736 goto out2; 737 } 738 if (tdvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE, p))) { 739 VOP_ABORTOP(tdvp, cnp); 740 goto out2; 741 } 742 ip = VTOI(vp); 743 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 744 VOP_ABORTOP(tdvp, cnp); 745 error = EMLINK; 746 goto out1; 747 } 748 if (ip->i_flags & (IMMUTABLE | APPEND)) { 749 VOP_ABORTOP(tdvp, cnp); 750 error = EPERM; 751 goto out1; 752 } 753 ip->i_effnlink++; 754 ip->i_nlink++; 755 ip->i_flag |= IN_CHANGE; 756 if (DOINGSOFTDEP(vp)) 757 softdep_increase_linkcnt(ip); 758 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 759 if (!error) { 760 ufs_makedirentry(ip, cnp, &newdir); 761 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 762 } 763 764 if (error) { 765 ip->i_effnlink--; 766 ip->i_nlink--; 767 ip->i_flag |= IN_CHANGE; 768 } 769 zfree(namei_zone, cnp->cn_pnbuf); 770out1: 771 if (tdvp != vp) 772 VOP_UNLOCK(vp, 0, p); 773out2: 774 VN_POLLEVENT(vp, POLLNLINK); 775 VN_POLLEVENT(tdvp, POLLWRITE); 776 return (error); 777} 778 779/* 780 * whiteout vnode call 781 */ 782int 783ufs_whiteout(ap) 784 struct vop_whiteout_args /* { 785 struct vnode *a_dvp; 786 struct componentname *a_cnp; 787 int a_flags; 788 } */ *ap; 789{ 790 struct vnode *dvp = ap->a_dvp; 791 struct componentname *cnp = ap->a_cnp; 792 struct direct newdir; 793 int error = 0; 794 795 switch (ap->a_flags) { 796 case LOOKUP: 797 /* 4.4 format directories support whiteout operations */ 798 if (dvp->v_mount->mnt_maxsymlinklen > 0) 799 return (0); 800 return (EOPNOTSUPP); 801 802 case CREATE: 803 /* create a new directory whiteout */ 804#ifdef DIAGNOSTIC 805 if ((cnp->cn_flags & SAVENAME) == 0) 806 panic("ufs_whiteout: missing name"); 807 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 808 panic("ufs_whiteout: old format filesystem"); 809#endif 810 811 newdir.d_ino = WINO; 812 newdir.d_namlen = cnp->cn_namelen; 813 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 814 newdir.d_type = DT_WHT; 815 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 816 break; 817 818 case DELETE: 819 /* remove an existing directory whiteout */ 820#ifdef DIAGNOSTIC 821 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 822 panic("ufs_whiteout: old format filesystem"); 823#endif 824 825 cnp->cn_flags &= ~DOWHITEOUT; 826 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 827 break; 828 default: 829 panic("ufs_whiteout: unknown op"); 830 } 831 if (cnp->cn_flags & HASBUF) { 832 zfree(namei_zone, cnp->cn_pnbuf); 833 cnp->cn_flags &= ~HASBUF; 834 } 835 return (error); 836} 837 838/* 839 * Rename system call. 840 * rename("foo", "bar"); 841 * is essentially 842 * unlink("bar"); 843 * link("foo", "bar"); 844 * unlink("foo"); 845 * but ``atomically''. Can't do full commit without saving state in the 846 * inode on disk which isn't feasible at this time. Best we can do is 847 * always guarantee the target exists. 848 * 849 * Basic algorithm is: 850 * 851 * 1) Bump link count on source while we're linking it to the 852 * target. This also ensure the inode won't be deleted out 853 * from underneath us while we work (it may be truncated by 854 * a concurrent `trunc' or `open' for creation). 855 * 2) Link source to destination. If destination already exists, 856 * delete it first. 857 * 3) Unlink source reference to inode if still around. If a 858 * directory was moved and the parent of the destination 859 * is different from the source, patch the ".." entry in the 860 * directory. 861 */ 862int 863ufs_rename(ap) 864 struct vop_rename_args /* { 865 struct vnode *a_fdvp; 866 struct vnode *a_fvp; 867 struct componentname *a_fcnp; 868 struct vnode *a_tdvp; 869 struct vnode *a_tvp; 870 struct componentname *a_tcnp; 871 } */ *ap; 872{ 873 struct vnode *tvp = ap->a_tvp; 874 register struct vnode *tdvp = ap->a_tdvp; 875 struct vnode *fvp = ap->a_fvp; 876 struct vnode *fdvp = ap->a_fdvp; 877 struct componentname *tcnp = ap->a_tcnp; 878 struct componentname *fcnp = ap->a_fcnp; 879 struct proc *p = fcnp->cn_proc; 880 struct inode *ip, *xp, *dp; 881 struct direct newdir; 882 int doingdirectory = 0, oldparent = 0, newparent = 0; 883 int error = 0, ioflag; 884 885#ifdef DIAGNOSTIC 886 if ((tcnp->cn_flags & HASBUF) == 0 || 887 (fcnp->cn_flags & HASBUF) == 0) 888 panic("ufs_rename: no name"); 889#endif 890 /* 891 * Check for cross-device rename. 892 */ 893 if ((fvp->v_mount != tdvp->v_mount) || 894 (tvp && (fvp->v_mount != tvp->v_mount))) { 895 error = EXDEV; 896abortit: 897 VOP_ABORTOP(tdvp, tcnp); 898 if (tdvp == tvp) 899 vrele(tdvp); 900 else 901 vput(tdvp); 902 if (tvp) 903 vput(tvp); 904 VOP_ABORTOP(fdvp, fcnp); 905 vrele(fdvp); 906 vrele(fvp); 907 return (error); 908 } 909 910 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 911 (VTOI(tdvp)->i_flags & APPEND))) { 912 error = EPERM; 913 goto abortit; 914 } 915 916 /* 917 * Check if just deleting a link name or if we've lost a race. 918 * If another process completes the same rename after we've looked 919 * up the source and have blocked looking up the target, then the 920 * source and target inodes may be identical now although the 921 * names were never linked. 922 */ 923 if (fvp == tvp) { 924 if (fvp->v_type == VDIR) { 925 /* 926 * Linked directories are impossible, so we must 927 * have lost the race. Pretend that the rename 928 * completed before the lookup. 929 */ 930#ifdef UFS_RENAME_DEBUG 931 printf("ufs_rename: fvp == tvp for directories\n"); 932#endif 933 error = ENOENT; 934 goto abortit; 935 } 936 937 /* Release destination completely. */ 938 VOP_ABORTOP(tdvp, tcnp); 939 vput(tdvp); 940 vput(tvp); 941 942 /* 943 * Delete source. There is another race now that everything 944 * is unlocked, but this doesn't cause any new complications. 945 * Relookup() may find a file that is unrelated to the 946 * original one, or it may fail. Too bad. 947 */ 948 vrele(fdvp); 949 vrele(fvp); 950 fcnp->cn_flags &= ~MODMASK; 951 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 952 if ((fcnp->cn_flags & SAVESTART) == 0) 953 panic("ufs_rename: lost from startdir"); 954 fcnp->cn_nameiop = DELETE; 955 VREF(fdvp); 956 error = relookup(fdvp, &fvp, fcnp); 957 if (error == 0) 958 vrele(fdvp); 959 if (fvp == NULL) { 960#ifdef UFS_RENAME_DEBUG 961 printf("ufs_rename: from name disappeared\n"); 962#endif 963 return (ENOENT); 964 } 965 error = VOP_REMOVE(fdvp, fvp, fcnp); 966 if (fdvp == fvp) 967 vrele(fdvp); 968 else 969 vput(fdvp); 970 vput(fvp); 971 return (error); 972 } 973 if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0) 974 goto abortit; 975 dp = VTOI(fdvp); 976 ip = VTOI(fvp); 977 if (ip->i_nlink >= LINK_MAX) { 978 VOP_UNLOCK(fvp, 0, p); 979 error = EMLINK; 980 goto abortit; 981 } 982 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 983 || (dp->i_flags & APPEND)) { 984 VOP_UNLOCK(fvp, 0, p); 985 error = EPERM; 986 goto abortit; 987 } 988 if ((ip->i_mode & IFMT) == IFDIR) { 989 /* 990 * Avoid ".", "..", and aliases of "." for obvious reasons. 991 */ 992 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 993 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 994 (ip->i_flag & IN_RENAME)) { 995 VOP_UNLOCK(fvp, 0, p); 996 error = EINVAL; 997 goto abortit; 998 } 999 ip->i_flag |= IN_RENAME; 1000 oldparent = dp->i_number; 1001 doingdirectory = 1; 1002 } 1003 VN_POLLEVENT(fdvp, POLLWRITE); 1004 vrele(fdvp); 1005 1006 /* 1007 * When the target exists, both the directory 1008 * and target vnodes are returned locked. 1009 */ 1010 dp = VTOI(tdvp); 1011 xp = NULL; 1012 if (tvp) 1013 xp = VTOI(tvp); 1014 1015 /* 1016 * 1) Bump link count while we're moving stuff 1017 * around. If we crash somewhere before 1018 * completing our work, the link count 1019 * may be wrong, but correctable. 1020 */ 1021 ip->i_effnlink++; 1022 ip->i_nlink++; 1023 ip->i_flag |= IN_CHANGE; 1024 if (DOINGSOFTDEP(fvp)) 1025 softdep_increase_linkcnt(ip); 1026 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 1027 DOINGASYNC(fvp)))) != 0) { 1028 VOP_UNLOCK(fvp, 0, p); 1029 goto bad; 1030 } 1031 1032 /* 1033 * If ".." must be changed (ie the directory gets a new 1034 * parent) then the source directory must not be in the 1035 * directory heirarchy above the target, as this would 1036 * orphan everything below the source directory. Also 1037 * the user must have write permission in the source so 1038 * as to be able to change "..". We must repeat the call 1039 * to namei, as the parent directory is unlocked by the 1040 * call to checkpath(). 1041 */ 1042 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); 1043 VOP_UNLOCK(fvp, 0, p); 1044 if (oldparent != dp->i_number) 1045 newparent = dp->i_number; 1046 if (doingdirectory && newparent) { 1047 if (error) /* write access check above */ 1048 goto bad; 1049 if (xp != NULL) 1050 vput(tvp); 1051 error = ufs_checkpath(ip, dp, tcnp->cn_cred); 1052 if (error) 1053 goto out; 1054 if ((tcnp->cn_flags & SAVESTART) == 0) 1055 panic("ufs_rename: lost to startdir"); 1056 VREF(tdvp); 1057 error = relookup(tdvp, &tvp, tcnp); 1058 if (error) 1059 goto out; 1060 vrele(tdvp); 1061 dp = VTOI(tdvp); 1062 xp = NULL; 1063 if (tvp) 1064 xp = VTOI(tvp); 1065 } 1066 /* 1067 * 2) If target doesn't exist, link the target 1068 * to the source and unlink the source. 1069 * Otherwise, rewrite the target directory 1070 * entry to reference the source inode and 1071 * expunge the original entry's existence. 1072 */ 1073 if (xp == NULL) { 1074 if (dp->i_dev != ip->i_dev) 1075 panic("ufs_rename: EXDEV"); 1076 /* 1077 * Account for ".." in new directory. 1078 * When source and destination have the same 1079 * parent we don't fool with the link count. 1080 */ 1081 if (doingdirectory && newparent) { 1082 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1083 error = EMLINK; 1084 goto bad; 1085 } 1086 dp->i_effnlink++; 1087 dp->i_nlink++; 1088 dp->i_flag |= IN_CHANGE; 1089 if (DOINGSOFTDEP(tdvp)) 1090 softdep_increase_linkcnt(dp); 1091 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1092 DOINGASYNC(tdvp))); 1093 if (error) 1094 goto bad; 1095 } 1096 ufs_makedirentry(ip, tcnp, &newdir); 1097 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1098 if (error) { 1099 if (doingdirectory && newparent) { 1100 dp->i_effnlink--; 1101 dp->i_nlink--; 1102 dp->i_flag |= IN_CHANGE; 1103 (void)UFS_UPDATE(tdvp, 1); 1104 } 1105 goto bad; 1106 } 1107 VN_POLLEVENT(tdvp, POLLWRITE); 1108 vput(tdvp); 1109 } else { 1110 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1111 panic("ufs_rename: EXDEV"); 1112 /* 1113 * Short circuit rename(foo, foo). 1114 */ 1115 if (xp->i_number == ip->i_number) 1116 panic("ufs_rename: same file"); 1117 /* 1118 * If the parent directory is "sticky", then the user must 1119 * own the parent directory, or the destination of the rename, 1120 * otherwise the destination may not be changed (except by 1121 * root). This implements append-only directories. 1122 */ 1123 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 1124 tcnp->cn_cred->cr_uid != dp->i_uid && 1125 xp->i_uid != tcnp->cn_cred->cr_uid) { 1126 error = EPERM; 1127 goto bad; 1128 } 1129 /* 1130 * Target must be empty if a directory and have no links 1131 * to it. Also, ensure source and target are compatible 1132 * (both directories, or both not directories). 1133 */ 1134 if ((xp->i_mode&IFMT) == IFDIR) { 1135 if ((xp->i_effnlink > 2) || 1136 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1137 error = ENOTEMPTY; 1138 goto bad; 1139 } 1140 if (!doingdirectory) { 1141 error = ENOTDIR; 1142 goto bad; 1143 } 1144 cache_purge(tdvp); 1145 } else if (doingdirectory) { 1146 error = EISDIR; 1147 goto bad; 1148 } 1149 error = ufs_dirrewrite(dp, xp, ip->i_number, 1150 IFTODT(ip->i_mode), 1151 (doingdirectory && newparent) ? newparent : doingdirectory); 1152 if (error) 1153 goto bad; 1154 if (doingdirectory) { 1155 if (!newparent) { 1156 dp->i_effnlink--; 1157 dp->i_flag |= IN_CHANGE; 1158 } 1159 xp->i_effnlink--; 1160 xp->i_flag |= IN_CHANGE; 1161 } 1162 VN_POLLEVENT(tdvp, POLLWRITE); 1163 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1164 /* 1165 * Truncate inode. The only stuff left in the directory 1166 * is "." and "..". The "." reference is inconsequential 1167 * since we are quashing it. We have removed the "." 1168 * reference and the reference in the parent directory, 1169 * but there may be other hard links. The soft 1170 * dependency code will arrange to do these operations 1171 * after the parent directory entry has been deleted on 1172 * disk, so when running with that code we avoid doing 1173 * them now. 1174 */ 1175 if (!newparent) 1176 dp->i_nlink--; 1177 xp->i_nlink--; 1178 ioflag = DOINGASYNC(tvp) ? 0 : IO_SYNC; 1179 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1180 tcnp->cn_cred, tcnp->cn_proc)) != 0) 1181 goto bad; 1182 } 1183 vput(tdvp); 1184 VN_POLLEVENT(tvp, POLLNLINK); /* XXX this right? */ 1185 vput(tvp); 1186 xp = NULL; 1187 } 1188 1189 /* 1190 * 3) Unlink the source. 1191 */ 1192 fcnp->cn_flags &= ~MODMASK; 1193 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1194 if ((fcnp->cn_flags & SAVESTART) == 0) 1195 panic("ufs_rename: lost from startdir"); 1196 VREF(fdvp); 1197 error = relookup(fdvp, &fvp, fcnp); 1198 if (error == 0) 1199 vrele(fdvp); 1200 if (fvp != NULL) { 1201 xp = VTOI(fvp); 1202 dp = VTOI(fdvp); 1203 } else { 1204 /* 1205 * From name has disappeared. 1206 */ 1207 if (doingdirectory) 1208 panic("ufs_rename: lost dir entry"); 1209 vrele(ap->a_fvp); 1210 return (0); 1211 } 1212 /* 1213 * Ensure that the directory entry still exists and has not 1214 * changed while the new name has been entered. If the source is 1215 * a file then the entry may have been unlinked or renamed. In 1216 * either case there is no further work to be done. If the source 1217 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1218 * flag ensures that it cannot be moved by another rename or removed 1219 * by a rmdir. 1220 */ 1221 if (xp != ip) { 1222 if (doingdirectory) 1223 panic("ufs_rename: lost dir entry"); 1224 } else { 1225 /* 1226 * If the source is a directory with a 1227 * new parent, the link count of the old 1228 * parent directory must be decremented 1229 * and ".." set to point to the new parent. 1230 */ 1231 if (doingdirectory && newparent) { 1232 xp->i_offset = mastertemplate.dot_reclen; 1233 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1234 cache_purge(fdvp); 1235 } 1236 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1237 xp->i_flag &= ~IN_RENAME; 1238 } 1239 if (dp) 1240 vput(fdvp); 1241 if (xp) 1242 vput(fvp); 1243 vrele(ap->a_fvp); 1244 return (error); 1245 1246bad: 1247 if (xp) 1248 vput(ITOV(xp)); 1249 vput(ITOV(dp)); 1250out: 1251 if (doingdirectory) 1252 ip->i_flag &= ~IN_RENAME; 1253 if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) { 1254 ip->i_effnlink--; 1255 ip->i_nlink--; 1256 ip->i_flag |= IN_CHANGE; 1257 ip->i_flag &= ~IN_RENAME; 1258 vput(fvp); 1259 } else 1260 vrele(fvp); 1261 return (error); 1262} 1263 1264/* 1265 * Mkdir system call 1266 */ 1267int 1268ufs_mkdir(ap) 1269 struct vop_mkdir_args /* { 1270 struct vnode *a_dvp; 1271 struct vnode **a_vpp; 1272 struct componentname *a_cnp; 1273 struct vattr *a_vap; 1274 } */ *ap; 1275{ 1276 register struct vnode *dvp = ap->a_dvp; 1277 register struct vattr *vap = ap->a_vap; 1278 register struct componentname *cnp = ap->a_cnp; 1279 register struct inode *ip, *dp; 1280 struct vnode *tvp; 1281 struct buf *bp; 1282 struct dirtemplate dirtemplate, *dtp; 1283 struct direct newdir; 1284 int error, dmode; 1285 long blkoff; 1286 1287#ifdef DIAGNOSTIC 1288 if ((cnp->cn_flags & HASBUF) == 0) 1289 panic("ufs_mkdir: no name"); 1290#endif 1291 dp = VTOI(dvp); 1292 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1293 error = EMLINK; 1294 goto out; 1295 } 1296 dmode = vap->va_mode & 0777; 1297 dmode |= IFDIR; 1298 /* 1299 * Must simulate part of ufs_makeinode here to acquire the inode, 1300 * but not have it entered in the parent directory. The entry is 1301 * made later after writing "." and ".." entries. 1302 */ 1303 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1304 if (error) 1305 goto out; 1306 ip = VTOI(tvp); 1307 ip->i_gid = dp->i_gid; 1308#ifdef SUIDDIR 1309 { 1310#ifdef QUOTA 1311 struct ucred ucred, *ucp; 1312 ucp = cnp->cn_cred; 1313#endif I 1314 /* 1315 * If we are hacking owners here, (only do this where told to) 1316 * and we are not giving it TOO root, (would subvert quotas) 1317 * then go ahead and give it to the other user. 1318 * The new directory also inherits the SUID bit. 1319 * If user's UID and dir UID are the same, 1320 * 'give it away' so that the SUID is still forced on. 1321 */ 1322 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1323 (dp->i_mode & ISUID) && dp->i_uid) { 1324 dmode |= ISUID; 1325 ip->i_uid = dp->i_uid; 1326#ifdef QUOTA 1327 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1328 /* 1329 * Make sure the correct user gets charged 1330 * for the space. 1331 * Make a dummy credential for the victim. 1332 * XXX This seems to never be accessed out of 1333 * our context so a stack variable is ok. 1334 */ 1335 ucred.cr_ref = 1; 1336 ucred.cr_uid = ip->i_uid; 1337 ucred.cr_ngroups = 1; 1338 ucred.cr_groups[0] = dp->i_gid; 1339 ucp = &ucred; 1340 } 1341#endif 1342 } else 1343 ip->i_uid = cnp->cn_cred->cr_uid; 1344#ifdef QUOTA 1345 if ((error = getinoquota(ip)) || 1346 (error = chkiq(ip, 1, ucp, 0))) { 1347 zfree(namei_zone, cnp->cn_pnbuf); 1348 UFS_VFREE(tvp, ip->i_number, dmode); 1349 vput(tvp); 1350 return (error); 1351 } 1352#endif 1353 } 1354#else /* !SUIDDIR */ 1355 ip->i_uid = cnp->cn_cred->cr_uid; 1356#ifdef QUOTA 1357 if ((error = getinoquota(ip)) || 1358 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1359 zfree(namei_zone, cnp->cn_pnbuf); 1360 UFS_VFREE(tvp, ip->i_number, dmode); 1361 vput(tvp); 1362 return (error); 1363 } 1364#endif 1365#endif /* !SUIDDIR */ 1366 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1367 ip->i_mode = dmode; 1368 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1369 ip->i_effnlink = 2; 1370 ip->i_nlink = 2; 1371 if (DOINGSOFTDEP(tvp)) 1372 softdep_increase_linkcnt(ip); 1373 if (cnp->cn_flags & ISWHITEOUT) 1374 ip->i_flags |= UF_OPAQUE; 1375 1376 /* 1377 * Bump link count in parent directory to reflect work done below. 1378 * Should be done before reference is created so cleanup is 1379 * possible if we crash. 1380 */ 1381 dp->i_effnlink++; 1382 dp->i_nlink++; 1383 dp->i_flag |= IN_CHANGE; 1384 if (DOINGSOFTDEP(dvp)) 1385 softdep_increase_linkcnt(dp); 1386 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1387 if (error) 1388 goto bad; 1389 1390 /* 1391 * Initialize directory with "." and ".." from static template. 1392 */ 1393 if (dvp->v_mount->mnt_maxsymlinklen > 0 1394 ) 1395 dtp = &mastertemplate; 1396 else 1397 dtp = (struct dirtemplate *)&omastertemplate; 1398 dirtemplate = *dtp; 1399 dirtemplate.dot_ino = ip->i_number; 1400 dirtemplate.dotdot_ino = dp->i_number; 1401 if ((error = VOP_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1402 B_CLRBUF, &bp)) != 0) 1403 goto bad; 1404 ip->i_size = DIRBLKSIZ; 1405 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1406 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1407 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1408 if (DOINGSOFTDEP(tvp)) { 1409 /* 1410 * Ensure that the entire newly allocated block is a 1411 * valid directory so that future growth within the 1412 * block does not have to ensure that the block is 1413 * written before the inode. 1414 */ 1415 blkoff = DIRBLKSIZ; 1416 while (blkoff < bp->b_bcount) { 1417 ((struct direct *) 1418 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1419 blkoff += DIRBLKSIZ; 1420 } 1421 } 1422 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1423 DOINGASYNC(tvp)))) != 0) { 1424 (void)VOP_BWRITE(bp->b_vp, bp); 1425 goto bad; 1426 } 1427 VN_POLLEVENT(dvp, POLLWRITE); /* XXX right place? */ 1428 /* 1429 * Directory set up, now install its entry in the parent directory. 1430 * 1431 * If we are not doing soft dependencies, then we must write out the 1432 * buffer containing the new directory body before entering the new 1433 * name in the parent. If we are doing soft dependencies, then the 1434 * buffer containing the new directory body will be passed to and 1435 * released in the soft dependency code after the code has attached 1436 * an appropriate ordering dependency to the buffer which ensures that 1437 * the buffer is written before the new name is written in the parent. 1438 */ 1439 if (DOINGASYNC(dvp)) 1440 bdwrite(bp); 1441 else if (!DOINGSOFTDEP(dvp) && ((error = VOP_BWRITE(bp->b_vp, bp)))) 1442 goto bad; 1443 ufs_makedirentry(ip, cnp, &newdir); 1444 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1445 1446bad: 1447 if (error == 0) { 1448 *ap->a_vpp = tvp; 1449 } else { 1450 dp->i_effnlink--; 1451 dp->i_nlink--; 1452 dp->i_flag |= IN_CHANGE; 1453 /* 1454 * No need to do an explicit VOP_TRUNCATE here, vrele will 1455 * do this for us because we set the link count to 0. 1456 */ 1457 ip->i_effnlink = 0; 1458 ip->i_nlink = 0; 1459 ip->i_flag |= IN_CHANGE; 1460 vput(tvp); 1461 } 1462out: 1463 zfree(namei_zone, cnp->cn_pnbuf); 1464 return (error); 1465} 1466 1467/* 1468 * Rmdir system call. 1469 */ 1470int 1471ufs_rmdir(ap) 1472 struct vop_rmdir_args /* { 1473 struct vnode *a_dvp; 1474 struct vnode *a_vp; 1475 struct componentname *a_cnp; 1476 } */ *ap; 1477{ 1478 struct vnode *vp = ap->a_vp; 1479 struct vnode *dvp = ap->a_dvp; 1480 struct componentname *cnp = ap->a_cnp; 1481 struct inode *ip, *dp; 1482 int error, ioflag; 1483 1484 ip = VTOI(vp); 1485 dp = VTOI(dvp); 1486 1487 /* 1488 * Do not remove a directory that is in the process of being renamed. 1489 * Verify the directory is empty (and valid). Rmdir ".." will not be 1490 * valid since ".." will contain a reference to the current directory 1491 * and thus be non-empty. Do not allow the removal of mounted on 1492 * directories (this can happen when an NFS exported filesystem 1493 * tries to remove a locally mounted on directory). 1494 */ 1495 error = 0; 1496 if (ip->i_flag & IN_RENAME) { 1497 error = EINVAL; 1498 goto out; 1499 } 1500 if (ip->i_effnlink != 2 || 1501 !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1502 error = ENOTEMPTY; 1503 goto out; 1504 } 1505 if ((dp->i_flags & APPEND) 1506 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1507 error = EPERM; 1508 goto out; 1509 } 1510 if (vp->v_mountedhere != 0) { 1511 error = EINVAL; 1512 goto out; 1513 } 1514 /* 1515 * Delete reference to directory before purging 1516 * inode. If we crash in between, the directory 1517 * will be reattached to lost+found, 1518 */ 1519 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1520 if (error) 1521 goto out; 1522 VN_POLLEVENT(dvp, POLLWRITE|POLLNLINK); 1523 cache_purge(dvp); 1524 /* 1525 * Truncate inode. The only stuff left in the directory is "." and 1526 * "..". The "." reference is inconsequential since we are quashing 1527 * it. We have removed the "." reference and the reference in the 1528 * parent directory, but there may be other hard links. So, 1529 * ufs_dirremove will set the UF_IMMUTABLE flag to ensure that no 1530 * new entries are made. The soft dependency code will arrange to 1531 * do these operations after the parent directory entry has been 1532 * deleted on disk, so when running with that code we avoid doing 1533 * them now. 1534 */ 1535 dp->i_effnlink--; 1536 dp->i_flag |= IN_CHANGE; 1537 ip->i_effnlink--; 1538 ip->i_flag |= IN_CHANGE; 1539 if (!DOINGSOFTDEP(vp)) { 1540 dp->i_nlink--; 1541 ip->i_nlink--; 1542 ioflag = DOINGASYNC(vp) ? 0 : IO_SYNC; 1543 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1544 cnp->cn_proc); 1545 } 1546 cache_purge(vp); 1547out: 1548 VN_POLLEVENT(vp, POLLNLINK); 1549 return (error); 1550} 1551 1552/* 1553 * symlink -- make a symbolic link 1554 */ 1555int 1556ufs_symlink(ap) 1557 struct vop_symlink_args /* { 1558 struct vnode *a_dvp; 1559 struct vnode **a_vpp; 1560 struct componentname *a_cnp; 1561 struct vattr *a_vap; 1562 char *a_target; 1563 } */ *ap; 1564{ 1565 register struct vnode *vp, **vpp = ap->a_vpp; 1566 register struct inode *ip; 1567 int len, error; 1568 1569 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1570 vpp, ap->a_cnp); 1571 if (error) 1572 return (error); 1573 VN_POLLEVENT(ap->a_dvp, POLLWRITE); 1574 vp = *vpp; 1575 len = strlen(ap->a_target); 1576 if (len < vp->v_mount->mnt_maxsymlinklen) { 1577 ip = VTOI(vp); 1578 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1579 ip->i_size = len; 1580 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1581 } else 1582 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1583 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, (int *)0, 1584 (struct proc *)0); 1585 vput(vp); 1586 return (error); 1587} 1588 1589/* 1590 * Vnode op for reading directories. 1591 * 1592 * The routine below assumes that the on-disk format of a directory 1593 * is the same as that defined by <sys/dirent.h>. If the on-disk 1594 * format changes, then it will be necessary to do a conversion 1595 * from the on-disk format that read returns to the format defined 1596 * by <sys/dirent.h>. 1597 */ 1598int 1599ufs_readdir(ap) 1600 struct vop_readdir_args /* { 1601 struct vnode *a_vp; 1602 struct uio *a_uio; 1603 struct ucred *a_cred; 1604 int *a_eofflag; 1605 int *ncookies; 1606 u_long **a_cookies; 1607 } */ *ap; 1608{ 1609 register struct uio *uio = ap->a_uio; 1610 int error; 1611 size_t count, lost; 1612 off_t off; 1613 1614 if (ap->a_ncookies != NULL) 1615 /* 1616 * Ensure that the block is aligned. The caller can use 1617 * the cookies to determine where in the block to start. 1618 */ 1619 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1620 off = uio->uio_offset; 1621 count = uio->uio_resid; 1622 /* Make sure we don't return partial entries. */ 1623 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1624 return (EINVAL); 1625 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1626 lost = uio->uio_resid - count; 1627 uio->uio_resid = count; 1628 uio->uio_iov->iov_len = count; 1629# if (BYTE_ORDER == LITTLE_ENDIAN) 1630 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1631 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1632 } else { 1633 struct dirent *dp, *edp; 1634 struct uio auio; 1635 struct iovec aiov; 1636 caddr_t dirbuf; 1637 int readcnt; 1638 u_char tmp; 1639 1640 auio = *uio; 1641 auio.uio_iov = &aiov; 1642 auio.uio_iovcnt = 1; 1643 auio.uio_segflg = UIO_SYSSPACE; 1644 aiov.iov_len = count; 1645 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); 1646 aiov.iov_base = dirbuf; 1647 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1648 if (error == 0) { 1649 readcnt = count - auio.uio_resid; 1650 edp = (struct dirent *)&dirbuf[readcnt]; 1651 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1652 tmp = dp->d_namlen; 1653 dp->d_namlen = dp->d_type; 1654 dp->d_type = tmp; 1655 if (dp->d_reclen > 0) { 1656 dp = (struct dirent *) 1657 ((char *)dp + dp->d_reclen); 1658 } else { 1659 error = EIO; 1660 break; 1661 } 1662 } 1663 if (dp >= edp) 1664 error = uiomove(dirbuf, readcnt, uio); 1665 } 1666 FREE(dirbuf, M_TEMP); 1667 } 1668# else 1669 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1670# endif 1671 if (!error && ap->a_ncookies != NULL) { 1672 struct dirent* dpStart; 1673 struct dirent* dpEnd; 1674 struct dirent* dp; 1675 int ncookies; 1676 u_long *cookies; 1677 u_long *cookiep; 1678 1679 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1680 panic("ufs_readdir: unexpected uio from NFS server"); 1681 dpStart = (struct dirent *) 1682 (uio->uio_iov->iov_base - (uio->uio_offset - off)); 1683 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1684 for (dp = dpStart, ncookies = 0; 1685 dp < dpEnd; 1686 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1687 ncookies++; 1688 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1689 M_WAITOK); 1690 for (dp = dpStart, cookiep = cookies; 1691 dp < dpEnd; 1692 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1693 off += dp->d_reclen; 1694 *cookiep++ = (u_long) off; 1695 } 1696 *ap->a_ncookies = ncookies; 1697 *ap->a_cookies = cookies; 1698 } 1699 uio->uio_resid += lost; 1700 if (ap->a_eofflag) 1701 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1702 return (error); 1703} 1704 1705/* 1706 * Return target name of a symbolic link 1707 */ 1708int 1709ufs_readlink(ap) 1710 struct vop_readlink_args /* { 1711 struct vnode *a_vp; 1712 struct uio *a_uio; 1713 struct ucred *a_cred; 1714 } */ *ap; 1715{ 1716 register struct vnode *vp = ap->a_vp; 1717 register struct inode *ip = VTOI(vp); 1718 int isize; 1719 1720 isize = ip->i_size; 1721 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1722 (ip->i_din.di_blocks == 0)) { /* XXX - for old fastlink support */ 1723 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1724 return (0); 1725 } 1726 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1727} 1728 1729/* 1730 * Ufs abort op, called after namei() when a CREATE/DELETE isn't actually 1731 * done. If a buffer has been saved in anticipation of a CREATE, delete it. 1732 */ 1733/* ARGSUSED */ 1734int 1735ufs_abortop(ap) 1736 struct vop_abortop_args /* { 1737 struct vnode *a_dvp; 1738 struct componentname *a_cnp; 1739 } */ *ap; 1740{ 1741 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 1742 zfree(namei_zone, ap->a_cnp->cn_pnbuf); 1743 return (0); 1744} 1745 1746/* 1747 * Calculate the logical to physical mapping if not done already, 1748 * then call the device strategy routine. 1749 * 1750 * In order to be able to swap to a file, the VOP_BMAP operation may not 1751 * deadlock on memory. See ufs_bmap() for details. 1752 */ 1753int 1754ufs_strategy(ap) 1755 struct vop_strategy_args /* { 1756 struct vnode *a_vp; 1757 struct buf *a_bp; 1758 } */ *ap; 1759{ 1760 register struct buf *bp = ap->a_bp; 1761 register struct vnode *vp = ap->a_vp; 1762 register struct inode *ip; 1763 int error; 1764 1765 ip = VTOI(vp); 1766 if (vp->v_type == VBLK || vp->v_type == VCHR) 1767 panic("ufs_strategy: spec"); 1768 if (bp->b_blkno == bp->b_lblkno) { 1769 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL, NULL); 1770 if (error) { 1771 bp->b_error = error; 1772 bp->b_flags |= B_ERROR; 1773 biodone(bp); 1774 return (error); 1775 } 1776 if ((long)bp->b_blkno == -1) 1777 vfs_bio_clrbuf(bp); 1778 } 1779 if ((long)bp->b_blkno == -1) { 1780 biodone(bp); 1781 return (0); 1782 } 1783 vp = ip->i_devvp; 1784 bp->b_dev = vp->v_rdev; 1785 VOP_STRATEGY(vp, bp); 1786 return (0); 1787} 1788 1789/* 1790 * Print out the contents of an inode. 1791 */ 1792int 1793ufs_print(ap) 1794 struct vop_print_args /* { 1795 struct vnode *a_vp; 1796 } */ *ap; 1797{ 1798 register struct vnode *vp = ap->a_vp; 1799 register struct inode *ip = VTOI(vp); 1800 1801 printf("tag VT_UFS, ino %lu, on dev %s (%d, %d)", 1802 (u_long)ip->i_number, devtoname(ip->i_dev), major(ip->i_dev), 1803 minor(ip->i_dev)); 1804 if (vp->v_type == VFIFO) 1805 fifo_printinfo(vp); 1806 lockmgr_printinfo(&ip->i_lock); 1807 printf("\n"); 1808 return (0); 1809} 1810 1811/* 1812 * Read wrapper for special devices. 1813 */ 1814int 1815ufsspec_read(ap) 1816 struct vop_read_args /* { 1817 struct vnode *a_vp; 1818 struct uio *a_uio; 1819 int a_ioflag; 1820 struct ucred *a_cred; 1821 } */ *ap; 1822{ 1823 int error, resid; 1824 struct inode *ip; 1825 struct uio *uio; 1826 1827 uio = ap->a_uio; 1828 resid = uio->uio_resid; 1829 error = VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap); 1830 /* 1831 * The inode may have been revoked during the call, so it must not 1832 * be accessed blindly here or in the other wrapper functions. 1833 */ 1834 ip = VTOI(ap->a_vp); 1835 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 1836 ip->i_flag |= IN_ACCESS; 1837 return (error); 1838} 1839 1840/* 1841 * Write wrapper for special devices. 1842 */ 1843int 1844ufsspec_write(ap) 1845 struct vop_write_args /* { 1846 struct vnode *a_vp; 1847 struct uio *a_uio; 1848 int a_ioflag; 1849 struct ucred *a_cred; 1850 } */ *ap; 1851{ 1852 int error, resid; 1853 struct inode *ip; 1854 struct uio *uio; 1855 1856 uio = ap->a_uio; 1857 resid = uio->uio_resid; 1858 error = VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap); 1859 ip = VTOI(ap->a_vp); 1860 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 1861 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE; 1862 return (error); 1863} 1864 1865/* 1866 * Close wrapper for special devices. 1867 * 1868 * Update the times on the inode then do device close. 1869 */ 1870int 1871ufsspec_close(ap) 1872 struct vop_close_args /* { 1873 struct vnode *a_vp; 1874 int a_fflag; 1875 struct ucred *a_cred; 1876 struct proc *a_p; 1877 } */ *ap; 1878{ 1879 struct vnode *vp = ap->a_vp; 1880 1881 simple_lock(&vp->v_interlock); 1882 if (vp->v_usecount > 1) 1883 ufs_itimes(vp); 1884 simple_unlock(&vp->v_interlock); 1885 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 1886} 1887 1888/* 1889 * Read wrapper for fifos. 1890 */ 1891int 1892ufsfifo_read(ap) 1893 struct vop_read_args /* { 1894 struct vnode *a_vp; 1895 struct uio *a_uio; 1896 int a_ioflag; 1897 struct ucred *a_cred; 1898 } */ *ap; 1899{ 1900 int error, resid; 1901 struct inode *ip; 1902 struct uio *uio; 1903 1904 uio = ap->a_uio; 1905 resid = uio->uio_resid; 1906 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap); 1907 ip = VTOI(ap->a_vp); 1908 if ((ap->a_vp->v_mount->mnt_flag & MNT_NOATIME) == 0 && ip != NULL && 1909 (uio->uio_resid != resid || (error == 0 && resid != 0))) 1910 VTOI(ap->a_vp)->i_flag |= IN_ACCESS; 1911 return (error); 1912} 1913 1914/* 1915 * Write wrapper for fifos. 1916 */ 1917int 1918ufsfifo_write(ap) 1919 struct vop_write_args /* { 1920 struct vnode *a_vp; 1921 struct uio *a_uio; 1922 int a_ioflag; 1923 struct ucred *a_cred; 1924 } */ *ap; 1925{ 1926 int error, resid; 1927 struct inode *ip; 1928 struct uio *uio; 1929 1930 uio = ap->a_uio; 1931 resid = uio->uio_resid; 1932 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap); 1933 ip = VTOI(ap->a_vp); 1934 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 1935 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE; 1936 return (error); 1937} 1938 1939/* 1940 * Close wrapper for fifos. 1941 * 1942 * Update the times on the inode then do device close. 1943 */ 1944int 1945ufsfifo_close(ap) 1946 struct vop_close_args /* { 1947 struct vnode *a_vp; 1948 int a_fflag; 1949 struct ucred *a_cred; 1950 struct proc *a_p; 1951 } */ *ap; 1952{ 1953 struct vnode *vp = ap->a_vp; 1954 1955 simple_lock(&vp->v_interlock); 1956 if (vp->v_usecount > 1) 1957 ufs_itimes(vp); 1958 simple_unlock(&vp->v_interlock); 1959 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 1960} 1961 1962/* 1963 * Return POSIX pathconf information applicable to ufs filesystems. 1964 */ 1965int 1966ufs_pathconf(ap) 1967 struct vop_pathconf_args /* { 1968 struct vnode *a_vp; 1969 int a_name; 1970 int *a_retval; 1971 } */ *ap; 1972{ 1973 1974 switch (ap->a_name) { 1975 case _PC_LINK_MAX: 1976 *ap->a_retval = LINK_MAX; 1977 return (0); 1978 case _PC_NAME_MAX: 1979 *ap->a_retval = NAME_MAX; 1980 return (0); 1981 case _PC_PATH_MAX: 1982 *ap->a_retval = PATH_MAX; 1983 return (0); 1984 case _PC_PIPE_BUF: 1985 *ap->a_retval = PIPE_BUF; 1986 return (0); 1987 case _PC_CHOWN_RESTRICTED: 1988 *ap->a_retval = 1; 1989 return (0); 1990 case _PC_NO_TRUNC: 1991 *ap->a_retval = 1; 1992 return (0); 1993 default: 1994 return (EINVAL); 1995 } 1996 /* NOTREACHED */ 1997} 1998 1999/* 2000 * Advisory record locking support 2001 */ 2002int 2003ufs_advlock(ap) 2004 struct vop_advlock_args /* { 2005 struct vnode *a_vp; 2006 caddr_t a_id; 2007 int a_op; 2008 struct flock *a_fl; 2009 int a_flags; 2010 } */ *ap; 2011{ 2012 register struct inode *ip = VTOI(ap->a_vp); 2013 2014 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size)); 2015} 2016 2017/* 2018 * Initialize the vnode associated with a new inode, handle aliased 2019 * vnodes. 2020 */ 2021int 2022ufs_vinit(mntp, specops, fifoops, vpp) 2023 struct mount *mntp; 2024 vop_t **specops; 2025 vop_t **fifoops; 2026 struct vnode **vpp; 2027{ 2028 struct inode *ip; 2029 struct vnode *vp, *nvp; 2030 struct timeval tv; 2031 2032 vp = *vpp; 2033 ip = VTOI(vp); 2034 switch(vp->v_type = IFTOVT(ip->i_mode)) { 2035 case VCHR: 2036 case VBLK: 2037 vp->v_op = specops; 2038 nvp = checkalias(vp, ip->i_rdev, mntp); 2039 if (nvp) { 2040 /* 2041 * Discard unneeded vnode, but save its inode. 2042 * Note that the lock is carried over in the inode 2043 * to the replacement vnode. 2044 */ 2045 nvp->v_data = vp->v_data; 2046 vp->v_data = NULL; 2047 vp->v_op = spec_vnodeop_p; 2048 vrele(vp); 2049 vgone(vp); 2050 /* 2051 * Reinitialize aliased inode. 2052 */ 2053 vp = nvp; 2054 ip->i_vnode = vp; 2055 } 2056 break; 2057 case VFIFO: 2058 vp->v_op = fifoops; 2059 break; 2060 default: 2061 break; 2062 2063 } 2064 if (ip->i_number == ROOTINO) 2065 vp->v_flag |= VROOT; 2066 /* 2067 * Initialize modrev times 2068 */ 2069 getmicrouptime(&tv); 2070 SETHIGH(ip->i_modrev, tv.tv_sec); 2071 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 2072 *vpp = vp; 2073 return (0); 2074} 2075 2076/* 2077 * Allocate a new inode. 2078 */ 2079int 2080ufs_makeinode(mode, dvp, vpp, cnp) 2081 int mode; 2082 struct vnode *dvp; 2083 struct vnode **vpp; 2084 struct componentname *cnp; 2085{ 2086 register struct inode *ip, *pdir; 2087 struct direct newdir; 2088 struct vnode *tvp; 2089 int error; 2090 2091 pdir = VTOI(dvp); 2092#ifdef DIAGNOSTIC 2093 if ((cnp->cn_flags & HASBUF) == 0) 2094 panic("ufs_makeinode: no name"); 2095#endif 2096 *vpp = NULL; 2097 if ((mode & IFMT) == 0) 2098 mode |= IFREG; 2099 2100 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2101 if (error) { 2102 zfree(namei_zone, cnp->cn_pnbuf); 2103 return (error); 2104 } 2105 ip = VTOI(tvp); 2106 ip->i_gid = pdir->i_gid; 2107#ifdef SUIDDIR 2108 { 2109#ifdef QUOTA 2110 struct ucred ucred, *ucp; 2111 ucp = cnp->cn_cred; 2112#endif I 2113 /* 2114 * If we are not the owner of the directory, 2115 * and we are hacking owners here, (only do this where told to) 2116 * and we are not giving it TOO root, (would subvert quotas) 2117 * then go ahead and give it to the other user. 2118 * Note that this drops off the execute bits for security. 2119 */ 2120 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2121 (pdir->i_mode & ISUID) && 2122 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2123 ip->i_uid = pdir->i_uid; 2124 mode &= ~07111; 2125#ifdef QUOTA 2126 /* 2127 * Make sure the correct user gets charged 2128 * for the space. 2129 * Quickly knock up a dummy credential for the victim. 2130 * XXX This seems to never be accessed out of our 2131 * context so a stack variable is ok. 2132 */ 2133 ucred.cr_ref = 1; 2134 ucred.cr_uid = ip->i_uid; 2135 ucred.cr_ngroups = 1; 2136 ucred.cr_groups[0] = pdir->i_gid; 2137 ucp = &ucred; 2138#endif 2139 } else 2140 ip->i_uid = cnp->cn_cred->cr_uid; 2141 2142#ifdef QUOTA 2143 if ((error = getinoquota(ip)) || 2144 (error = chkiq(ip, 1, ucp, 0))) { 2145 zfree(namei_zone, cnp->cn_pnbuf); 2146 UFS_VFREE(tvp, ip->i_number, mode); 2147 vput(tvp); 2148 return (error); 2149 } 2150#endif 2151 } 2152#else /* !SUIDDIR */ 2153 ip->i_uid = cnp->cn_cred->cr_uid; 2154#ifdef QUOTA 2155 if ((error = getinoquota(ip)) || 2156 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2157 zfree(namei_zone, cnp->cn_pnbuf); 2158 UFS_VFREE(tvp, ip->i_number, mode); 2159 vput(tvp); 2160 return (error); 2161 } 2162#endif 2163#endif /* !SUIDDIR */ 2164 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2165 ip->i_mode = mode; 2166 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2167 ip->i_effnlink = 1; 2168 ip->i_nlink = 1; 2169 if (DOINGSOFTDEP(tvp)) 2170 softdep_increase_linkcnt(ip); 2171 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2172 suser_xxx(cnp->cn_cred, 0, 0)) 2173 ip->i_mode &= ~ISGID; 2174 2175 if (cnp->cn_flags & ISWHITEOUT) 2176 ip->i_flags |= UF_OPAQUE; 2177 2178 /* 2179 * Make sure inode goes to disk before directory entry. 2180 */ 2181 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2182 if (error) 2183 goto bad; 2184 ufs_makedirentry(ip, cnp, &newdir); 2185 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2186 if (error) 2187 goto bad; 2188 2189 if ((cnp->cn_flags & SAVESTART) == 0) 2190 zfree(namei_zone, cnp->cn_pnbuf); 2191 *vpp = tvp; 2192 return (0); 2193 2194bad: 2195 /* 2196 * Write error occurred trying to update the inode 2197 * or the directory so must deallocate the inode. 2198 */ 2199 zfree(namei_zone, cnp->cn_pnbuf); 2200 ip->i_effnlink = 0; 2201 ip->i_nlink = 0; 2202 ip->i_flag |= IN_CHANGE; 2203 vput(tvp); 2204 return (error); 2205} 2206 2207static int 2208ufs_missingop(ap) 2209 struct vop_generic_args *ap; 2210{ 2211 2212 panic("no vop function for %s in ufs child", ap->a_desc->vdesc_name); 2213 return (EOPNOTSUPP); 2214} 2215 2216/* Global vfs data structures for ufs. */ 2217static vop_t **ufs_vnodeop_p; 2218static struct vnodeopv_entry_desc ufs_vnodeop_entries[] = { 2219 { &vop_default_desc, (vop_t *) vop_defaultop }, 2220 { &vop_fsync_desc, (vop_t *) ufs_missingop }, 2221 { &vop_read_desc, (vop_t *) ufs_missingop }, 2222 { &vop_reallocblks_desc, (vop_t *) ufs_missingop }, 2223 { &vop_write_desc, (vop_t *) ufs_missingop }, 2224 { &vop_abortop_desc, (vop_t *) ufs_abortop }, 2225 { &vop_access_desc, (vop_t *) ufs_access }, 2226 { &vop_advlock_desc, (vop_t *) ufs_advlock }, 2227 { &vop_bmap_desc, (vop_t *) ufs_bmap }, 2228 { &vop_cachedlookup_desc, (vop_t *) ufs_lookup }, 2229 { &vop_close_desc, (vop_t *) ufs_close }, 2230 { &vop_create_desc, (vop_t *) ufs_create }, 2231 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2232 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2233 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 2234 { &vop_link_desc, (vop_t *) ufs_link }, 2235 { &vop_lock_desc, (vop_t *) vop_stdlock }, 2236 { &vop_lookup_desc, (vop_t *) vfs_cache_lookup }, 2237 { &vop_mkdir_desc, (vop_t *) ufs_mkdir }, 2238 { &vop_mknod_desc, (vop_t *) ufs_mknod }, 2239 { &vop_mmap_desc, (vop_t *) ufs_mmap }, 2240 { &vop_open_desc, (vop_t *) ufs_open }, 2241 { &vop_pathconf_desc, (vop_t *) ufs_pathconf }, 2242 { &vop_poll_desc, (vop_t *) vop_stdpoll }, 2243 { &vop_print_desc, (vop_t *) ufs_print }, 2244 { &vop_readdir_desc, (vop_t *) ufs_readdir }, 2245 { &vop_readlink_desc, (vop_t *) ufs_readlink }, 2246 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2247 { &vop_remove_desc, (vop_t *) ufs_remove }, 2248 { &vop_rename_desc, (vop_t *) ufs_rename }, 2249 { &vop_rmdir_desc, (vop_t *) ufs_rmdir }, 2250 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2251 { &vop_strategy_desc, (vop_t *) ufs_strategy }, 2252 { &vop_symlink_desc, (vop_t *) ufs_symlink }, 2253 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 2254 { &vop_whiteout_desc, (vop_t *) ufs_whiteout }, 2255 { NULL, NULL } 2256}; 2257static struct vnodeopv_desc ufs_vnodeop_opv_desc = 2258 { &ufs_vnodeop_p, ufs_vnodeop_entries }; 2259 2260static vop_t **ufs_specop_p; 2261static struct vnodeopv_entry_desc ufs_specop_entries[] = { 2262 { &vop_default_desc, (vop_t *) spec_vnoperate }, 2263 { &vop_fsync_desc, (vop_t *) ufs_missingop }, 2264 { &vop_access_desc, (vop_t *) ufs_access }, 2265 { &vop_close_desc, (vop_t *) ufsspec_close }, 2266 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2267 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2268 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 2269 { &vop_lock_desc, (vop_t *) vop_stdlock }, 2270 { &vop_print_desc, (vop_t *) ufs_print }, 2271 { &vop_read_desc, (vop_t *) ufsspec_read }, 2272 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2273 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2274 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 2275 { &vop_write_desc, (vop_t *) ufsspec_write }, 2276 { NULL, NULL } 2277}; 2278static struct vnodeopv_desc ufs_specop_opv_desc = 2279 { &ufs_specop_p, ufs_specop_entries }; 2280 2281static vop_t **ufs_fifoop_p; 2282static struct vnodeopv_entry_desc ufs_fifoop_entries[] = { 2283 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 2284 { &vop_fsync_desc, (vop_t *) ufs_missingop }, 2285 { &vop_access_desc, (vop_t *) ufs_access }, 2286 { &vop_close_desc, (vop_t *) ufsfifo_close }, 2287 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2288 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2289 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 2290 { &vop_lock_desc, (vop_t *) vop_stdlock }, 2291 { &vop_print_desc, (vop_t *) ufs_print }, 2292 { &vop_read_desc, (vop_t *) ufsfifo_read }, 2293 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2294 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2295 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 2296 { &vop_write_desc, (vop_t *) ufsfifo_write }, 2297 { NULL, NULL } 2298}; 2299static struct vnodeopv_desc ufs_fifoop_opv_desc = 2300 { &ufs_fifoop_p, ufs_fifoop_entries }; 2301 2302VNODEOP_SET(ufs_vnodeop_opv_desc); 2303VNODEOP_SET(ufs_specop_opv_desc); 2304VNODEOP_SET(ufs_fifoop_opv_desc); 2305 2306int 2307ufs_vnoperate(ap) 2308 struct vop_generic_args /* { 2309 struct vnodeop_desc *a_desc; 2310 } */ *ap; 2311{ 2312 return (VOCALL(ufs_vnodeop_p, ap->a_desc->vdesc_offset, ap)); 2313} 2314 2315int 2316ufs_vnoperatefifo(ap) 2317 struct vop_generic_args /* { 2318 struct vnodeop_desc *a_desc; 2319 } */ *ap; 2320{ 2321 return (VOCALL(ufs_fifoop_p, ap->a_desc->vdesc_offset, ap)); 2322} 2323 2324int 2325ufs_vnoperatespec(ap) 2326 struct vop_generic_args /* { 2327 struct vnodeop_desc *a_desc; 2328 } */ *ap; 2329{ 2330 return (VOCALL(ufs_specop_p, ap->a_desc->vdesc_offset, ap)); 2331} 2332 2333 2334