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sys/ufs/ufs/ufs_vnops.c
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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 * $FreeBSD$ 40 */ 41 42 #include "opt_quota.h" 43 #include "opt_suiddir.h" 44 #include "opt_ufs.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/kernel.h> 50 #include <sys/fcntl.h> 51 #include <sys/stat.h> 52 #include <sys/buf.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/unistd.h> 56 #include <sys/vnode.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 #include <sys/lockf.h> 60 #include <sys/event.h> 61 #include <sys/conf.h> 62 63 #include <sys/file.h> /* XXX */ 64 65 #include <vm/vm.h> 66 #include <vm/vm_extern.h> 67 68 #include <miscfs/fifofs/fifo.h> 69 70 #include <ufs/ufs/quota.h> 71 #include <ufs/ufs/inode.h> 72 #include <ufs/ufs/dir.h> 73 #include <ufs/ufs/ufsmount.h> 74 #include <ufs/ufs/ufs_extern.h> 75 #ifdef UFS_DIRHASH 76 #include <ufs/ufs/dirhash.h> 77 #endif 78 79 static int ufs_access __P((struct vop_access_args *)); 80 static int ufs_advlock __P((struct vop_advlock_args *)); 81 static int ufs_chmod __P((struct vnode *, int, struct ucred *, struct proc *)); 82 static int ufs_chown __P((struct vnode *, uid_t, gid_t, struct ucred *, struct proc *)); 83 static int ufs_close __P((struct vop_close_args *)); 84 static int ufs_create __P((struct vop_create_args *)); 85 static int ufs_getattr __P((struct vop_getattr_args *)); 86 static int ufs_link __P((struct vop_link_args *)); 87 static int ufs_makeinode __P((int mode, struct vnode *, struct vnode **, struct componentname *)); 88 static int ufs_missingop __P((struct vop_generic_args *ap)); 89 static int ufs_mkdir __P((struct vop_mkdir_args *)); 90 static int ufs_mknod __P((struct vop_mknod_args *)); 91 static int ufs_mmap __P((struct vop_mmap_args *)); 92 static int ufs_open __P((struct vop_open_args *)); 93 static int ufs_pathconf __P((struct vop_pathconf_args *)); 94 static int ufs_print __P((struct vop_print_args *)); 95 static int ufs_readdir __P((struct vop_readdir_args *)); 96 static int ufs_readlink __P((struct vop_readlink_args *)); 97 static int ufs_remove __P((struct vop_remove_args *)); 98 static int ufs_rename __P((struct vop_rename_args *)); 99 static int ufs_rmdir __P((struct vop_rmdir_args *)); 100 static int ufs_setattr __P((struct vop_setattr_args *)); 101 static int ufs_strategy __P((struct vop_strategy_args *)); 102 static int ufs_symlink __P((struct vop_symlink_args *)); 103 static int ufs_whiteout __P((struct vop_whiteout_args *)); 104 static int ufsfifo_close __P((struct vop_close_args *)); 105 static int ufsfifo_kqfilter __P((struct vop_kqfilter_args *)); 106 static int ufsfifo_read __P((struct vop_read_args *)); 107 static int ufsfifo_write __P((struct vop_write_args *)); 108 static int ufsspec_close __P((struct vop_close_args *)); 109 static int ufsspec_read __P((struct vop_read_args *)); 110 static int ufsspec_write __P((struct vop_write_args *)); 111 static int filt_ufsread __P((struct knote *kn, long hint)); 112 static int filt_ufswrite __P((struct knote *kn, long hint)); 113 static int filt_ufsvnode __P((struct knote *kn, long hint)); 114 static void filt_ufsdetach __P((struct knote *kn)); 115 static int ufs_kqfilter __P((struct vop_kqfilter_args *ap)); 116 117 union _qcvt { 118 int64_t qcvt; 119 int32_t val[2]; 120 }; 121 #define SETHIGH(q, h) { \ 122 union _qcvt tmp; \ 123 tmp.qcvt = (q); \ 124 tmp.val[_QUAD_HIGHWORD] = (h); \ 125 (q) = tmp.qcvt; \ 126 } 127 #define SETLOW(q, l) { \ 128 union _qcvt tmp; \ 129 tmp.qcvt = (q); \ 130 tmp.val[_QUAD_LOWWORD] = (l); \ 131 (q) = tmp.qcvt; \ 132 } 133 #define VN_KNOTE(vp, b) \ 134 KNOTE(&vp->v_pollinfo.vpi_selinfo.si_note, (b)) 135 136 /* 137 * A virgin directory (no blushing please). 138 */ 139 static struct dirtemplate mastertemplate = { 140 0, 12, DT_DIR, 1, ".", 141 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." 142 }; 143 static struct odirtemplate omastertemplate = { 144 0, 12, 1, ".", 145 0, DIRBLKSIZ - 12, 2, ".." 146 }; 147 148 void 149 ufs_itimes(vp) 150 struct vnode *vp; 151 { 152 struct inode *ip; 153 struct timespec ts; 154 155 ip = VTOI(vp); 156 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 157 return; 158 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp)) 159 ip->i_flag |= IN_LAZYMOD; 160 else 161 ip->i_flag |= IN_MODIFIED; 162 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 163 vfs_timestamp(&ts); 164 if (ip->i_flag & IN_ACCESS) { 165 ip->i_atime = ts.tv_sec; 166 ip->i_atimensec = ts.tv_nsec; 167 } 168 if (ip->i_flag & IN_UPDATE) { 169 ip->i_mtime = ts.tv_sec; 170 ip->i_mtimensec = ts.tv_nsec; 171 ip->i_modrev++; 172 } 173 if (ip->i_flag & IN_CHANGE) { 174 ip->i_ctime = ts.tv_sec; 175 ip->i_ctimensec = ts.tv_nsec; 176 } 177 } 178 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 179 } 180 181 /* 182 * Create a regular file 183 */ 184 int 185 ufs_create(ap) 186 struct vop_create_args /* { 187 struct vnode *a_dvp; 188 struct vnode **a_vpp; 189 struct componentname *a_cnp; 190 struct vattr *a_vap; 191 } */ *ap; 192 { 193 int error; 194 195 error = 196 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 197 ap->a_dvp, ap->a_vpp, ap->a_cnp); 198 if (error) 199 return (error); 200 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 201 return (0); 202 } 203 204 /* 205 * Mknod vnode call 206 */ 207 /* ARGSUSED */ 208 int 209 ufs_mknod(ap) 210 struct vop_mknod_args /* { 211 struct vnode *a_dvp; 212 struct vnode **a_vpp; 213 struct componentname *a_cnp; 214 struct vattr *a_vap; 215 } */ *ap; 216 { 217 struct vattr *vap = ap->a_vap; 218 struct vnode **vpp = ap->a_vpp; 219 struct inode *ip; 220 ino_t ino; 221 int error; 222 223 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 224 ap->a_dvp, vpp, ap->a_cnp); 225 if (error) 226 return (error); 227 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 228 ip = VTOI(*vpp); 229 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 230 if (vap->va_rdev != VNOVAL) { 231 /* 232 * Want to be able to use this to make badblock 233 * inodes, so don't truncate the dev number. 234 */ 235 ip->i_rdev = vap->va_rdev; 236 } 237 /* 238 * Remove inode, then reload it through VFS_VGET so it is 239 * checked to see if it is an alias of an existing entry in 240 * the inode cache. 241 */ 242 vput(*vpp); 243 (*vpp)->v_type = VNON; 244 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 245 vgone(*vpp); 246 error = VFS_VGET(ap->a_dvp->v_mount, ino, vpp); 247 if (error) { 248 *vpp = NULL; 249 return (error); 250 } 251 return (0); 252 } 253 254 /* 255 * Open called. 256 * 257 * Nothing to do. 258 */ 259 /* ARGSUSED */ 260 int 261 ufs_open(ap) 262 struct vop_open_args /* { 263 struct vnode *a_vp; 264 int a_mode; 265 struct ucred *a_cred; 266 struct proc *a_p; 267 } */ *ap; 268 { 269 270 /* 271 * Files marked append-only must be opened for appending. 272 */ 273 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 274 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 275 return (EPERM); 276 return (0); 277 } 278 279 /* 280 * Close called. 281 * 282 * Update the times on the inode. 283 */ 284 /* ARGSUSED */ 285 int 286 ufs_close(ap) 287 struct vop_close_args /* { 288 struct vnode *a_vp; 289 int a_fflag; 290 struct ucred *a_cred; 291 struct proc *a_p; 292 } */ *ap; 293 { 294 register struct vnode *vp = ap->a_vp; 295 296 simple_lock(&vp->v_interlock); 297 if (vp->v_usecount > 1) 298 ufs_itimes(vp); 299 simple_unlock(&vp->v_interlock); 300 return (0); 301 } 302 303 int 304 ufs_access(ap) 305 struct vop_access_args /* { 306 struct vnode *a_vp; 307 int a_mode; 308 struct ucred *a_cred; 309 struct proc *a_p; 310 } */ *ap; 311 { 312 struct vnode *vp = ap->a_vp; 313 struct inode *ip = VTOI(vp); 314 struct ucred *cred = ap->a_cred; 315 mode_t mask, mode = ap->a_mode; 316 register gid_t *gp; 317 int i; 318 #ifdef QUOTA 319 int error; 320 #endif 321 322 /* 323 * Disallow write attempts on read-only file systems; 324 * unless the file is a socket, fifo, or a block or 325 * character device resident on the file system. 326 */ 327 if (mode & VWRITE) { 328 switch (vp->v_type) { 329 case VDIR: 330 case VLNK: 331 case VREG: 332 if (vp->v_mount->mnt_flag & MNT_RDONLY) 333 return (EROFS); 334 #ifdef QUOTA 335 if ((error = getinoquota(ip)) != 0) 336 return (error); 337 #endif 338 break; 339 default: 340 break; 341 } 342 } 343 344 /* If immutable bit set, nobody gets to write it. */ 345 if ((mode & VWRITE) && (ip->i_flags & IMMUTABLE)) 346 return (EPERM); 347 348 /* Otherwise, user id 0 always gets access. */ 349 if (cred->cr_uid == 0) 350 return (0); 351 352 mask = 0; 353 354 /* Otherwise, check the owner. */ 355 if (cred->cr_uid == ip->i_uid) { 356 if (mode & VEXEC) 357 mask |= S_IXUSR; 358 if (mode & VREAD) 359 mask |= S_IRUSR; 360 if (mode & VWRITE) 361 mask |= S_IWUSR; 362 return ((ip->i_mode & mask) == mask ? 0 : EACCES); 363 } 364 365 /* Otherwise, check the groups. */ 366 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++) 367 if (ip->i_gid == *gp) { 368 if (mode & VEXEC) 369 mask |= S_IXGRP; 370 if (mode & VREAD) 371 mask |= S_IRGRP; 372 if (mode & VWRITE) 373 mask |= S_IWGRP; 374 return ((ip->i_mode & mask) == mask ? 0 : EACCES); 375 } 376 377 /* Otherwise, check everyone else. */ 378 if (mode & VEXEC) 379 mask |= S_IXOTH; 380 if (mode & VREAD) 381 mask |= S_IROTH; 382 if (mode & VWRITE) 383 mask |= S_IWOTH; 384 return ((ip->i_mode & mask) == mask ? 0 : EACCES); 385 } 386 387 /* ARGSUSED */ 388 int 389 ufs_getattr(ap) 390 struct vop_getattr_args /* { 391 struct vnode *a_vp; 392 struct vattr *a_vap; 393 struct ucred *a_cred; 394 struct proc *a_p; 395 } */ *ap; 396 { 397 register struct vnode *vp = ap->a_vp; 398 register struct inode *ip = VTOI(vp); 399 register struct vattr *vap = ap->a_vap; 400 401 ufs_itimes(vp); 402 /* 403 * Copy from inode table 404 */ 405 vap->va_fsid = dev2udev(ip->i_dev); 406 vap->va_fileid = ip->i_number; 407 vap->va_mode = ip->i_mode & ~IFMT; 408 vap->va_nlink = VFSTOUFS(vp->v_mount)->um_i_effnlink_valid ? 409 ip->i_effnlink : ip->i_nlink; 410 vap->va_uid = ip->i_uid; 411 vap->va_gid = ip->i_gid; 412 vap->va_rdev = ip->i_rdev; 413 vap->va_size = ip->i_din.di_size; 414 vap->va_atime.tv_sec = ip->i_atime; 415 vap->va_atime.tv_nsec = ip->i_atimensec; 416 vap->va_mtime.tv_sec = ip->i_mtime; 417 vap->va_mtime.tv_nsec = ip->i_mtimensec; 418 vap->va_ctime.tv_sec = ip->i_ctime; 419 vap->va_ctime.tv_nsec = ip->i_ctimensec; 420 vap->va_flags = ip->i_flags; 421 vap->va_gen = ip->i_gen; 422 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 423 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 424 vap->va_type = IFTOVT(ip->i_mode); 425 vap->va_filerev = ip->i_modrev; 426 return (0); 427 } 428 429 /* 430 * Set attribute vnode op. called from several syscalls 431 */ 432 int 433 ufs_setattr(ap) 434 struct vop_setattr_args /* { 435 struct vnode *a_vp; 436 struct vattr *a_vap; 437 struct ucred *a_cred; 438 struct proc *a_p; 439 } */ *ap; 440 { 441 struct vattr *vap = ap->a_vap; 442 struct vnode *vp = ap->a_vp; 443 struct inode *ip = VTOI(vp); 444 struct ucred *cred = ap->a_cred; 445 struct proc *p = ap->a_p; 446 int error; 447 448 /* 449 * Check for unsettable attributes. 450 */ 451 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 452 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 453 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 454 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 455 return (EINVAL); 456 } 457 if (vap->va_flags != VNOVAL) { 458 if (vp->v_mount->mnt_flag & MNT_RDONLY) 459 return (EROFS); 460 if (cred->cr_uid != ip->i_uid && 461 (error = suser_xxx(cred, p, PRISON_ROOT))) 462 return (error); 463 if ((cred->cr_uid == 0) && (p->p_prison == NULL)) { 464 if ((ip->i_flags 465 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) && 466 securelevel > 0) 467 return (EPERM); 468 ip->i_flags = vap->va_flags; 469 } else { 470 if (ip->i_flags 471 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 472 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 473 return (EPERM); 474 ip->i_flags &= SF_SETTABLE; 475 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 476 } 477 ip->i_flag |= IN_CHANGE; 478 if (vap->va_flags & (IMMUTABLE | APPEND)) 479 return (0); 480 } 481 if (ip->i_flags & (IMMUTABLE | APPEND)) 482 return (EPERM); 483 /* 484 * Go through the fields and update iff not VNOVAL. 485 */ 486 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 487 if (vp->v_mount->mnt_flag & MNT_RDONLY) 488 return (EROFS); 489 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p)) != 0) 490 return (error); 491 } 492 if (vap->va_size != VNOVAL) { 493 /* 494 * Disallow write attempts on read-only file systems; 495 * unless the file is a socket, fifo, or a block or 496 * character device resident on the file system. 497 */ 498 switch (vp->v_type) { 499 case VDIR: 500 return (EISDIR); 501 case VLNK: 502 case VREG: 503 if (vp->v_mount->mnt_flag & MNT_RDONLY) 504 return (EROFS); 505 break; 506 default: 507 break; 508 } 509 if ((error = UFS_TRUNCATE(vp, vap->va_size, 0, cred, p)) != 0) 510 return (error); 511 } 512 ip = VTOI(vp); 513 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 514 if (vp->v_mount->mnt_flag & MNT_RDONLY) 515 return (EROFS); 516 if (cred->cr_uid != ip->i_uid && 517 (error = suser_xxx(cred, p, PRISON_ROOT)) && 518 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 519 (error = VOP_ACCESS(vp, VWRITE, cred, p)))) 520 return (error); 521 if (vap->va_atime.tv_sec != VNOVAL) 522 ip->i_flag |= IN_ACCESS; 523 if (vap->va_mtime.tv_sec != VNOVAL) 524 ip->i_flag |= IN_CHANGE | IN_UPDATE; 525 ufs_itimes(vp); 526 if (vap->va_atime.tv_sec != VNOVAL) { 527 ip->i_atime = vap->va_atime.tv_sec; 528 ip->i_atimensec = vap->va_atime.tv_nsec; 529 } 530 if (vap->va_mtime.tv_sec != VNOVAL) { 531 ip->i_mtime = vap->va_mtime.tv_sec; 532 ip->i_mtimensec = vap->va_mtime.tv_nsec; 533 } 534 error = UFS_UPDATE(vp, 0); 535 if (error) 536 return (error); 537 } 538 error = 0; 539 if (vap->va_mode != (mode_t)VNOVAL) { 540 if (vp->v_mount->mnt_flag & MNT_RDONLY) 541 return (EROFS); 542 error = ufs_chmod(vp, (int)vap->va_mode, cred, p); 543 } 544 VN_KNOTE(vp, NOTE_ATTRIB); 545 return (error); 546 } 547 548 /* 549 * Change the mode on a file. 550 * Inode must be locked before calling. 551 */ 552 static int 553 ufs_chmod(vp, mode, cred, p) 554 register struct vnode *vp; 555 register int mode; 556 register struct ucred *cred; 557 struct proc *p; 558 { 559 register struct inode *ip = VTOI(vp); 560 int error; 561 562 if (cred->cr_uid != ip->i_uid) { 563 error = suser_xxx(cred, p, PRISON_ROOT); 564 if (error) 565 return (error); 566 } 567 if (cred->cr_uid) { 568 if (vp->v_type != VDIR && (mode & S_ISTXT)) 569 return (EFTYPE); 570 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) 571 return (EPERM); 572 } 573 ip->i_mode &= ~ALLPERMS; 574 ip->i_mode |= (mode & ALLPERMS); 575 ip->i_flag |= IN_CHANGE; 576 return (0); 577 } 578 579 /* 580 * Perform chown operation on inode ip; 581 * inode must be locked prior to call. 582 */ 583 static int 584 ufs_chown(vp, uid, gid, cred, p) 585 register struct vnode *vp; 586 uid_t uid; 587 gid_t gid; 588 struct ucred *cred; 589 struct proc *p; 590 { 591 register struct inode *ip = VTOI(vp); 592 uid_t ouid; 593 gid_t ogid; 594 int error = 0; 595 #ifdef QUOTA 596 register int i; 597 long change; 598 #endif 599 600 if (uid == (uid_t)VNOVAL) 601 uid = ip->i_uid; 602 if (gid == (gid_t)VNOVAL) 603 gid = ip->i_gid; 604 /* 605 * If we don't own the file, are trying to change the owner 606 * of the file, or are not a member of the target group, 607 * the caller must be superuser or the call fails. 608 */ 609 if ((cred->cr_uid != ip->i_uid || uid != ip->i_uid || 610 (gid != ip->i_gid && !groupmember((gid_t)gid, cred))) && 611 (error = suser_xxx(cred, p, PRISON_ROOT))) 612 return (error); 613 ogid = ip->i_gid; 614 ouid = ip->i_uid; 615 #ifdef QUOTA 616 if ((error = getinoquota(ip)) != 0) 617 return (error); 618 if (ouid == uid) { 619 dqrele(vp, ip->i_dquot[USRQUOTA]); 620 ip->i_dquot[USRQUOTA] = NODQUOT; 621 } 622 if (ogid == gid) { 623 dqrele(vp, ip->i_dquot[GRPQUOTA]); 624 ip->i_dquot[GRPQUOTA] = NODQUOT; 625 } 626 change = ip->i_blocks; 627 (void) chkdq(ip, -change, cred, CHOWN); 628 (void) chkiq(ip, -1, cred, CHOWN); 629 for (i = 0; i < MAXQUOTAS; i++) { 630 dqrele(vp, ip->i_dquot[i]); 631 ip->i_dquot[i] = NODQUOT; 632 } 633 #endif 634 ip->i_gid = gid; 635 ip->i_uid = uid; 636 #ifdef QUOTA 637 if ((error = getinoquota(ip)) == 0) { 638 if (ouid == uid) { 639 dqrele(vp, ip->i_dquot[USRQUOTA]); 640 ip->i_dquot[USRQUOTA] = NODQUOT; 641 } 642 if (ogid == gid) { 643 dqrele(vp, ip->i_dquot[GRPQUOTA]); 644 ip->i_dquot[GRPQUOTA] = NODQUOT; 645 } 646 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 647 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 648 goto good; 649 else 650 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 651 } 652 for (i = 0; i < MAXQUOTAS; i++) { 653 dqrele(vp, ip->i_dquot[i]); 654 ip->i_dquot[i] = NODQUOT; 655 } 656 } 657 ip->i_gid = ogid; 658 ip->i_uid = ouid; 659 if (getinoquota(ip) == 0) { 660 if (ouid == uid) { 661 dqrele(vp, ip->i_dquot[USRQUOTA]); 662 ip->i_dquot[USRQUOTA] = NODQUOT; 663 } 664 if (ogid == gid) { 665 dqrele(vp, ip->i_dquot[GRPQUOTA]); 666 ip->i_dquot[GRPQUOTA] = NODQUOT; 667 } 668 (void) chkdq(ip, change, cred, FORCE|CHOWN); 669 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 670 (void) getinoquota(ip); 671 } 672 return (error); 673 good: 674 if (getinoquota(ip)) 675 panic("ufs_chown: lost quota"); 676 #endif /* QUOTA */ 677 ip->i_flag |= IN_CHANGE; 678 if (cred->cr_uid != 0 && (ouid != uid || ogid != gid)) 679 ip->i_mode &= ~(ISUID | ISGID); 680 return (0); 681 } 682 683 /* 684 * Mmap a file 685 * 686 * NB Currently unsupported. 687 */ 688 /* ARGSUSED */ 689 int 690 ufs_mmap(ap) 691 struct vop_mmap_args /* { 692 struct vnode *a_vp; 693 int a_fflags; 694 struct ucred *a_cred; 695 struct proc *a_p; 696 } */ *ap; 697 { 698 699 return (EINVAL); 700 } 701 702 int 703 ufs_remove(ap) 704 struct vop_remove_args /* { 705 struct vnode *a_dvp; 706 struct vnode *a_vp; 707 struct componentname *a_cnp; 708 } */ *ap; 709 { 710 struct inode *ip; 711 struct vnode *vp = ap->a_vp; 712 struct vnode *dvp = ap->a_dvp; 713 int error; 714 715 ip = VTOI(vp); 716 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 717 (VTOI(dvp)->i_flags & APPEND)) { 718 error = EPERM; 719 goto out; 720 } 721 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 722 VN_KNOTE(vp, NOTE_DELETE); 723 VN_KNOTE(dvp, NOTE_WRITE); 724 out: 725 return (error); 726 } 727 728 /* 729 * link vnode call 730 */ 731 int 732 ufs_link(ap) 733 struct vop_link_args /* { 734 struct vnode *a_tdvp; 735 struct vnode *a_vp; 736 struct componentname *a_cnp; 737 } */ *ap; 738 { 739 struct vnode *vp = ap->a_vp; 740 struct vnode *tdvp = ap->a_tdvp; 741 struct componentname *cnp = ap->a_cnp; 742 struct proc *p = cnp->cn_proc; 743 struct inode *ip; 744 struct direct newdir; 745 int error; 746 747 #ifdef DIAGNOSTIC 748 if ((cnp->cn_flags & HASBUF) == 0) 749 panic("ufs_link: no name"); 750 #endif 751 if (tdvp->v_mount != vp->v_mount) { 752 error = EXDEV; 753 goto out2; 754 } 755 if (tdvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE, p))) { 756 goto out2; 757 } 758 ip = VTOI(vp); 759 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 760 error = EMLINK; 761 goto out1; 762 } 763 if (ip->i_flags & (IMMUTABLE | APPEND)) { 764 error = EPERM; 765 goto out1; 766 } 767 ip->i_effnlink++; 768 ip->i_nlink++; 769 ip->i_flag |= IN_CHANGE; 770 if (DOINGSOFTDEP(vp)) 771 softdep_change_linkcnt(ip); 772 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 773 if (!error) { 774 ufs_makedirentry(ip, cnp, &newdir); 775 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 776 } 777 778 if (error) { 779 ip->i_effnlink--; 780 ip->i_nlink--; 781 ip->i_flag |= IN_CHANGE; 782 if (DOINGSOFTDEP(vp)) 783 softdep_change_linkcnt(ip); 784 } 785 out1: 786 if (tdvp != vp) 787 VOP_UNLOCK(vp, 0, p); 788 out2: 789 VN_KNOTE(vp, NOTE_LINK); 790 VN_KNOTE(tdvp, NOTE_WRITE); 791 return (error); 792 } 793 794 /* 795 * whiteout vnode call 796 */ 797 int 798 ufs_whiteout(ap) 799 struct vop_whiteout_args /* { 800 struct vnode *a_dvp; 801 struct componentname *a_cnp; 802 int a_flags; 803 } */ *ap; 804 { 805 struct vnode *dvp = ap->a_dvp; 806 struct componentname *cnp = ap->a_cnp; 807 struct direct newdir; 808 int error = 0; 809 810 switch (ap->a_flags) { 811 case LOOKUP: 812 /* 4.4 format directories support whiteout operations */ 813 if (dvp->v_mount->mnt_maxsymlinklen > 0) 814 return (0); 815 return (EOPNOTSUPP); 816 817 case CREATE: 818 /* create a new directory whiteout */ 819 #ifdef DIAGNOSTIC 820 if ((cnp->cn_flags & SAVENAME) == 0) 821 panic("ufs_whiteout: missing name"); 822 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 823 panic("ufs_whiteout: old format filesystem"); 824 #endif 825 826 newdir.d_ino = WINO; 827 newdir.d_namlen = cnp->cn_namelen; 828 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 829 newdir.d_type = DT_WHT; 830 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 831 break; 832 833 case DELETE: 834 /* remove an existing directory whiteout */ 835 #ifdef DIAGNOSTIC 836 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 837 panic("ufs_whiteout: old format filesystem"); 838 #endif 839 840 cnp->cn_flags &= ~DOWHITEOUT; 841 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 842 break; 843 default: 844 panic("ufs_whiteout: unknown op"); 845 } 846 return (error); 847 } 848 849 /* 850 * Rename system call. 851 * rename("foo", "bar"); 852 * is essentially 853 * unlink("bar"); 854 * link("foo", "bar"); 855 * unlink("foo"); 856 * but ``atomically''. Can't do full commit without saving state in the 857 * inode on disk which isn't feasible at this time. Best we can do is 858 * always guarantee the target exists. 859 * 860 * Basic algorithm is: 861 * 862 * 1) Bump link count on source while we're linking it to the 863 * target. This also ensure the inode won't be deleted out 864 * from underneath us while we work (it may be truncated by 865 * a concurrent `trunc' or `open' for creation). 866 * 2) Link source to destination. If destination already exists, 867 * delete it first. 868 * 3) Unlink source reference to inode if still around. If a 869 * directory was moved and the parent of the destination 870 * is different from the source, patch the ".." entry in the 871 * directory. 872 */ 873 int 874 ufs_rename(ap) 875 struct vop_rename_args /* { 876 struct vnode *a_fdvp; 877 struct vnode *a_fvp; 878 struct componentname *a_fcnp; 879 struct vnode *a_tdvp; 880 struct vnode *a_tvp; 881 struct componentname *a_tcnp; 882 } */ *ap; 883 { 884 struct vnode *tvp = ap->a_tvp; 885 register struct vnode *tdvp = ap->a_tdvp; 886 struct vnode *fvp = ap->a_fvp; 887 struct vnode *fdvp = ap->a_fdvp; 888 struct componentname *tcnp = ap->a_tcnp; 889 struct componentname *fcnp = ap->a_fcnp; 890 struct proc *p = fcnp->cn_proc; 891 struct inode *ip, *xp, *dp; 892 struct direct newdir; 893 int doingdirectory = 0, oldparent = 0, newparent = 0; 894 int error = 0, ioflag; 895 896 #ifdef DIAGNOSTIC 897 if ((tcnp->cn_flags & HASBUF) == 0 || 898 (fcnp->cn_flags & HASBUF) == 0) 899 panic("ufs_rename: no name"); 900 #endif 901 /* 902 * Check for cross-device rename. 903 */ 904 if ((fvp->v_mount != tdvp->v_mount) || 905 (tvp && (fvp->v_mount != tvp->v_mount))) { 906 error = EXDEV; 907 abortit: 908 if (tdvp == tvp) 909 vrele(tdvp); 910 else 911 vput(tdvp); 912 if (tvp) 913 vput(tvp); 914 vrele(fdvp); 915 vrele(fvp); 916 return (error); 917 } 918 919 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 920 (VTOI(tdvp)->i_flags & APPEND))) { 921 error = EPERM; 922 goto abortit; 923 } 924 925 /* 926 * Renaming a file to itself has no effect. The upper layers should 927 * not call us in that case. Temporarily just warn if they do. 928 */ 929 if (fvp == tvp) { 930 printf("ufs_rename: fvp == tvp (can't happen)\n"); 931 error = 0; 932 goto abortit; 933 } 934 935 if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0) 936 goto abortit; 937 dp = VTOI(fdvp); 938 ip = VTOI(fvp); 939 if (ip->i_nlink >= LINK_MAX) { 940 VOP_UNLOCK(fvp, 0, p); 941 error = EMLINK; 942 goto abortit; 943 } 944 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 945 || (dp->i_flags & APPEND)) { 946 VOP_UNLOCK(fvp, 0, p); 947 error = EPERM; 948 goto abortit; 949 } 950 if ((ip->i_mode & IFMT) == IFDIR) { 951 /* 952 * Avoid ".", "..", and aliases of "." for obvious reasons. 953 */ 954 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 955 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 956 (ip->i_flag & IN_RENAME)) { 957 VOP_UNLOCK(fvp, 0, p); 958 error = EINVAL; 959 goto abortit; 960 } 961 ip->i_flag |= IN_RENAME; 962 oldparent = dp->i_number; 963 doingdirectory = 1; 964 } 965 VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */ 966 vrele(fdvp); 967 968 /* 969 * When the target exists, both the directory 970 * and target vnodes are returned locked. 971 */ 972 dp = VTOI(tdvp); 973 xp = NULL; 974 if (tvp) 975 xp = VTOI(tvp); 976 977 /* 978 * 1) Bump link count while we're moving stuff 979 * around. If we crash somewhere before 980 * completing our work, the link count 981 * may be wrong, but correctable. 982 */ 983 ip->i_effnlink++; 984 ip->i_nlink++; 985 ip->i_flag |= IN_CHANGE; 986 if (DOINGSOFTDEP(fvp)) 987 softdep_change_linkcnt(ip); 988 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 989 DOINGASYNC(fvp)))) != 0) { 990 VOP_UNLOCK(fvp, 0, p); 991 goto bad; 992 } 993 994 /* 995 * If ".." must be changed (ie the directory gets a new 996 * parent) then the source directory must not be in the 997 * directory heirarchy above the target, as this would 998 * orphan everything below the source directory. Also 999 * the user must have write permission in the source so 1000 * as to be able to change "..". We must repeat the call 1001 * to namei, as the parent directory is unlocked by the 1002 * call to checkpath(). 1003 */ 1004 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); 1005 VOP_UNLOCK(fvp, 0, p); 1006 if (oldparent != dp->i_number) 1007 newparent = dp->i_number; 1008 if (doingdirectory && newparent) { 1009 if (error) /* write access check above */ 1010 goto bad; 1011 if (xp != NULL) 1012 vput(tvp); 1013 error = ufs_checkpath(ip, dp, tcnp->cn_cred); 1014 if (error) 1015 goto out; 1016 if ((tcnp->cn_flags & SAVESTART) == 0) 1017 panic("ufs_rename: lost to startdir"); 1018 VREF(tdvp); 1019 error = relookup(tdvp, &tvp, tcnp); 1020 if (error) 1021 goto out; 1022 vrele(tdvp); 1023 dp = VTOI(tdvp); 1024 xp = NULL; 1025 if (tvp) 1026 xp = VTOI(tvp); 1027 } 1028 /* 1029 * 2) If target doesn't exist, link the target 1030 * to the source and unlink the source. 1031 * Otherwise, rewrite the target directory 1032 * entry to reference the source inode and 1033 * expunge the original entry's existence. 1034 */ 1035 if (xp == NULL) { 1036 if (dp->i_dev != ip->i_dev) 1037 panic("ufs_rename: EXDEV"); 1038 /* 1039 * Account for ".." in new directory. 1040 * When source and destination have the same 1041 * parent we don't fool with the link count. 1042 */ 1043 if (doingdirectory && newparent) { 1044 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1045 error = EMLINK; 1046 goto bad; 1047 } 1048 dp->i_effnlink++; 1049 dp->i_nlink++; 1050 dp->i_flag |= IN_CHANGE; 1051 if (DOINGSOFTDEP(tdvp)) 1052 softdep_change_linkcnt(dp); 1053 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1054 DOINGASYNC(tdvp))); 1055 if (error) 1056 goto bad; 1057 } 1058 ufs_makedirentry(ip, tcnp, &newdir); 1059 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1060 if (error) { 1061 if (doingdirectory && newparent) { 1062 dp->i_effnlink--; 1063 dp->i_nlink--; 1064 dp->i_flag |= IN_CHANGE; 1065 if (DOINGSOFTDEP(tdvp)) 1066 softdep_change_linkcnt(dp); 1067 (void)UFS_UPDATE(tdvp, 1); 1068 } 1069 goto bad; 1070 } 1071 VN_KNOTE(tdvp, NOTE_WRITE); 1072 vput(tdvp); 1073 } else { 1074 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1075 panic("ufs_rename: EXDEV"); 1076 /* 1077 * Short circuit rename(foo, foo). 1078 */ 1079 if (xp->i_number == ip->i_number) 1080 panic("ufs_rename: same file"); 1081 /* 1082 * If the parent directory is "sticky", then the user must 1083 * own the parent directory, or the destination of the rename, 1084 * otherwise the destination may not be changed (except by 1085 * root). This implements append-only directories. 1086 */ 1087 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 1088 tcnp->cn_cred->cr_uid != dp->i_uid && 1089 xp->i_uid != tcnp->cn_cred->cr_uid) { 1090 error = EPERM; 1091 goto bad; 1092 } 1093 /* 1094 * Target must be empty if a directory and have no links 1095 * to it. Also, ensure source and target are compatible 1096 * (both directories, or both not directories). 1097 */ 1098 if ((xp->i_mode&IFMT) == IFDIR) { 1099 if ((xp->i_effnlink > 2) || 1100 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1101 error = ENOTEMPTY; 1102 goto bad; 1103 } 1104 if (!doingdirectory) { 1105 error = ENOTDIR; 1106 goto bad; 1107 } 1108 cache_purge(tdvp); 1109 } else if (doingdirectory) { 1110 error = EISDIR; 1111 goto bad; 1112 } 1113 error = ufs_dirrewrite(dp, xp, ip->i_number, 1114 IFTODT(ip->i_mode), 1115 (doingdirectory && newparent) ? newparent : doingdirectory); 1116 if (error) 1117 goto bad; 1118 if (doingdirectory) { 1119 if (!newparent) { 1120 dp->i_effnlink--; 1121 if (DOINGSOFTDEP(tdvp)) 1122 softdep_change_linkcnt(dp); 1123 } 1124 xp->i_effnlink--; 1125 if (DOINGSOFTDEP(tvp)) 1126 softdep_change_linkcnt(xp); 1127 } 1128 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1129 /* 1130 * Truncate inode. The only stuff left in the directory 1131 * is "." and "..". The "." reference is inconsequential 1132 * since we are quashing it. We have removed the "." 1133 * reference and the reference in the parent directory, 1134 * but there may be other hard links. The soft 1135 * dependency code will arrange to do these operations 1136 * after the parent directory entry has been deleted on 1137 * disk, so when running with that code we avoid doing 1138 * them now. 1139 */ 1140 if (!newparent) { 1141 dp->i_nlink--; 1142 dp->i_flag |= IN_CHANGE; 1143 } 1144 xp->i_nlink--; 1145 xp->i_flag |= IN_CHANGE; 1146 ioflag = DOINGASYNC(tvp) ? 0 : IO_SYNC; 1147 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1148 tcnp->cn_cred, tcnp->cn_proc)) != 0) 1149 goto bad; 1150 } 1151 VN_KNOTE(tdvp, NOTE_WRITE); 1152 vput(tdvp); 1153 VN_KNOTE(tvp, NOTE_DELETE); 1154 vput(tvp); 1155 xp = NULL; 1156 } 1157 1158 /* 1159 * 3) Unlink the source. 1160 */ 1161 fcnp->cn_flags &= ~MODMASK; 1162 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1163 if ((fcnp->cn_flags & SAVESTART) == 0) 1164 panic("ufs_rename: lost from startdir"); 1165 VREF(fdvp); 1166 error = relookup(fdvp, &fvp, fcnp); 1167 if (error == 0) 1168 vrele(fdvp); 1169 if (fvp != NULL) { 1170 xp = VTOI(fvp); 1171 dp = VTOI(fdvp); 1172 } else { 1173 /* 1174 * From name has disappeared. 1175 */ 1176 if (doingdirectory) 1177 panic("ufs_rename: lost dir entry"); 1178 vrele(ap->a_fvp); 1179 return (0); 1180 } 1181 /* 1182 * Ensure that the directory entry still exists and has not 1183 * changed while the new name has been entered. If the source is 1184 * a file then the entry may have been unlinked or renamed. In 1185 * either case there is no further work to be done. If the source 1186 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1187 * flag ensures that it cannot be moved by another rename or removed 1188 * by a rmdir. 1189 */ 1190 if (xp != ip) { 1191 if (doingdirectory) 1192 panic("ufs_rename: lost dir entry"); 1193 } else { 1194 /* 1195 * If the source is a directory with a 1196 * new parent, the link count of the old 1197 * parent directory must be decremented 1198 * and ".." set to point to the new parent. 1199 */ 1200 if (doingdirectory && newparent) { 1201 xp->i_offset = mastertemplate.dot_reclen; 1202 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1203 cache_purge(fdvp); 1204 } 1205 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1206 xp->i_flag &= ~IN_RENAME; 1207 } 1208 VN_KNOTE(fvp, NOTE_RENAME); 1209 if (dp) 1210 vput(fdvp); 1211 if (xp) 1212 vput(fvp); 1213 vrele(ap->a_fvp); 1214 return (error); 1215 1216 bad: 1217 if (xp) 1218 vput(ITOV(xp)); 1219 vput(ITOV(dp)); 1220 out: 1221 if (doingdirectory) 1222 ip->i_flag &= ~IN_RENAME; 1223 if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) { 1224 ip->i_effnlink--; 1225 ip->i_nlink--; 1226 ip->i_flag |= IN_CHANGE; 1227 ip->i_flag &= ~IN_RENAME; 1228 if (DOINGSOFTDEP(fvp)) 1229 softdep_change_linkcnt(ip); 1230 vput(fvp); 1231 } else 1232 vrele(fvp); 1233 return (error); 1234 } 1235 1236 /* 1237 * Mkdir system call 1238 */ 1239 int 1240 ufs_mkdir(ap) 1241 struct vop_mkdir_args /* { 1242 struct vnode *a_dvp; 1243 struct vnode **a_vpp; 1244 struct componentname *a_cnp; 1245 struct vattr *a_vap; 1246 } */ *ap; 1247 { 1248 register struct vnode *dvp = ap->a_dvp; 1249 register struct vattr *vap = ap->a_vap; 1250 register struct componentname *cnp = ap->a_cnp; 1251 register struct inode *ip, *dp; 1252 struct vnode *tvp; 1253 struct buf *bp; 1254 struct dirtemplate dirtemplate, *dtp; 1255 struct direct newdir; 1256 int error, dmode; 1257 long blkoff; 1258 1259 #ifdef DIAGNOSTIC 1260 if ((cnp->cn_flags & HASBUF) == 0) 1261 panic("ufs_mkdir: no name"); 1262 #endif 1263 dp = VTOI(dvp); 1264 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1265 error = EMLINK; 1266 goto out; 1267 } 1268 dmode = vap->va_mode & 0777; 1269 dmode |= IFDIR; 1270 /* 1271 * Must simulate part of ufs_makeinode here to acquire the inode, 1272 * but not have it entered in the parent directory. The entry is 1273 * made later after writing "." and ".." entries. 1274 */ 1275 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1276 if (error) 1277 goto out; 1278 ip = VTOI(tvp); 1279 ip->i_gid = dp->i_gid; 1280 #ifdef SUIDDIR 1281 { 1282 #ifdef QUOTA 1283 struct ucred ucred, *ucp; 1284 ucp = cnp->cn_cred; 1285 #endif 1286 /* 1287 * If we are hacking owners here, (only do this where told to) 1288 * and we are not giving it TO root, (would subvert quotas) 1289 * then go ahead and give it to the other user. 1290 * The new directory also inherits the SUID bit. 1291 * If user's UID and dir UID are the same, 1292 * 'give it away' so that the SUID is still forced on. 1293 */ 1294 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1295 (dp->i_mode & ISUID) && dp->i_uid) { 1296 dmode |= ISUID; 1297 ip->i_uid = dp->i_uid; 1298 #ifdef QUOTA 1299 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1300 /* 1301 * Make sure the correct user gets charged 1302 * for the space. 1303 * Make a dummy credential for the victim. 1304 * XXX This seems to never be accessed out of 1305 * our context so a stack variable is ok. 1306 */ 1307 ucred.cr_ref = 1; 1308 ucred.cr_uid = ip->i_uid; 1309 ucred.cr_ngroups = 1; 1310 ucred.cr_groups[0] = dp->i_gid; 1311 ucp = &ucred; 1312 } 1313 #endif 1314 } else 1315 ip->i_uid = cnp->cn_cred->cr_uid; 1316 #ifdef QUOTA 1317 if ((error = getinoquota(ip)) || 1318 (error = chkiq(ip, 1, ucp, 0))) { 1319 UFS_VFREE(tvp, ip->i_number, dmode); 1320 vput(tvp); 1321 return (error); 1322 } 1323 #endif 1324 } 1325 #else /* !SUIDDIR */ 1326 ip->i_uid = cnp->cn_cred->cr_uid; 1327 #ifdef QUOTA 1328 if ((error = getinoquota(ip)) || 1329 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1330 UFS_VFREE(tvp, ip->i_number, dmode); 1331 vput(tvp); 1332 return (error); 1333 } 1334 #endif 1335 #endif /* !SUIDDIR */ 1336 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1337 ip->i_mode = dmode; 1338 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1339 ip->i_effnlink = 2; 1340 ip->i_nlink = 2; 1341 if (DOINGSOFTDEP(tvp)) 1342 softdep_change_linkcnt(ip); 1343 if (cnp->cn_flags & ISWHITEOUT) 1344 ip->i_flags |= UF_OPAQUE; 1345 1346 /* 1347 * Bump link count in parent directory to reflect work done below. 1348 * Should be done before reference is created so cleanup is 1349 * possible if we crash. 1350 */ 1351 dp->i_effnlink++; 1352 dp->i_nlink++; 1353 dp->i_flag |= IN_CHANGE; 1354 if (DOINGSOFTDEP(dvp)) 1355 softdep_change_linkcnt(dp); 1356 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1357 if (error) 1358 goto bad; 1359 1360 /* 1361 * Initialize directory with "." and ".." from static template. 1362 */ 1363 if (dvp->v_mount->mnt_maxsymlinklen > 0 1364 ) 1365 dtp = &mastertemplate; 1366 else 1367 dtp = (struct dirtemplate *)&omastertemplate; 1368 dirtemplate = *dtp; 1369 dirtemplate.dot_ino = ip->i_number; 1370 dirtemplate.dotdot_ino = dp->i_number; 1371 if ((error = VOP_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1372 B_CLRBUF, &bp)) != 0) 1373 goto bad; 1374 ip->i_size = DIRBLKSIZ; 1375 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1376 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1377 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1378 if (DOINGSOFTDEP(tvp)) { 1379 /* 1380 * Ensure that the entire newly allocated block is a 1381 * valid directory so that future growth within the 1382 * block does not have to ensure that the block is 1383 * written before the inode. 1384 */ 1385 blkoff = DIRBLKSIZ; 1386 while (blkoff < bp->b_bcount) { 1387 ((struct direct *) 1388 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1389 blkoff += DIRBLKSIZ; 1390 } 1391 } 1392 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1393 DOINGASYNC(tvp)))) != 0) { 1394 (void)VOP_BWRITE(bp->b_vp, bp); 1395 goto bad; 1396 } 1397 /* 1398 * Directory set up, now install its entry in the parent directory. 1399 * 1400 * If we are not doing soft dependencies, then we must write out the 1401 * buffer containing the new directory body before entering the new 1402 * name in the parent. If we are doing soft dependencies, then the 1403 * buffer containing the new directory body will be passed to and 1404 * released in the soft dependency code after the code has attached 1405 * an appropriate ordering dependency to the buffer which ensures that 1406 * the buffer is written before the new name is written in the parent. 1407 */ 1408 if (DOINGASYNC(dvp)) 1409 bdwrite(bp); 1410 else if (!DOINGSOFTDEP(dvp) && ((error = VOP_BWRITE(bp->b_vp, bp)))) 1411 goto bad; 1412 ufs_makedirentry(ip, cnp, &newdir); 1413 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1414 1415 bad: 1416 if (error == 0) { 1417 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1418 *ap->a_vpp = tvp; 1419 } else { 1420 dp->i_effnlink--; 1421 dp->i_nlink--; 1422 dp->i_flag |= IN_CHANGE; 1423 if (DOINGSOFTDEP(dvp)) 1424 softdep_change_linkcnt(dp); 1425 /* 1426 * No need to do an explicit VOP_TRUNCATE here, vrele will 1427 * do this for us because we set the link count to 0. 1428 */ 1429 ip->i_effnlink = 0; 1430 ip->i_nlink = 0; 1431 ip->i_flag |= IN_CHANGE; 1432 if (DOINGSOFTDEP(tvp)) 1433 softdep_change_linkcnt(ip); 1434 vput(tvp); 1435 } 1436 out: 1437 return (error); 1438 } 1439 1440 /* 1441 * Rmdir system call. 1442 */ 1443 int 1444 ufs_rmdir(ap) 1445 struct vop_rmdir_args /* { 1446 struct vnode *a_dvp; 1447 struct vnode *a_vp; 1448 struct componentname *a_cnp; 1449 } */ *ap; 1450 { 1451 struct vnode *vp = ap->a_vp; 1452 struct vnode *dvp = ap->a_dvp; 1453 struct componentname *cnp = ap->a_cnp; 1454 struct inode *ip, *dp; 1455 int error, ioflag; 1456 1457 ip = VTOI(vp); 1458 dp = VTOI(dvp); 1459 1460 /* 1461 * Do not remove a directory that is in the process of being renamed. 1462 * Verify the directory is empty (and valid). Rmdir ".." will not be 1463 * valid since ".." will contain a reference to the current directory 1464 * and thus be non-empty. Do not allow the removal of mounted on 1465 * directories (this can happen when an NFS exported filesystem 1466 * tries to remove a locally mounted on directory). 1467 */ 1468 error = 0; 1469 if (ip->i_flag & IN_RENAME) { 1470 error = EINVAL; 1471 goto out; 1472 } 1473 if (ip->i_effnlink != 2 || 1474 !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1475 error = ENOTEMPTY; 1476 goto out; 1477 } 1478 if ((dp->i_flags & APPEND) 1479 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1480 error = EPERM; 1481 goto out; 1482 } 1483 if (vp->v_mountedhere != 0) { 1484 error = EINVAL; 1485 goto out; 1486 } 1487 /* 1488 * Delete reference to directory before purging 1489 * inode. If we crash in between, the directory 1490 * will be reattached to lost+found, 1491 */ 1492 dp->i_effnlink--; 1493 ip->i_effnlink--; 1494 if (DOINGSOFTDEP(vp)) { 1495 softdep_change_linkcnt(dp); 1496 softdep_change_linkcnt(ip); 1497 } 1498 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1499 if (error) { 1500 dp->i_effnlink++; 1501 ip->i_effnlink++; 1502 if (DOINGSOFTDEP(vp)) { 1503 softdep_change_linkcnt(dp); 1504 softdep_change_linkcnt(ip); 1505 } 1506 goto out; 1507 } 1508 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1509 cache_purge(dvp); 1510 /* 1511 * Truncate inode. The only stuff left in the directory is "." and 1512 * "..". The "." reference is inconsequential since we are quashing 1513 * it. The soft dependency code will arrange to do these operations 1514 * after the parent directory entry has been deleted on disk, so 1515 * when running with that code we avoid doing them now. 1516 */ 1517 if (!DOINGSOFTDEP(vp)) { 1518 dp->i_nlink--; 1519 dp->i_flag |= IN_CHANGE; 1520 ip->i_nlink--; 1521 ip->i_flag |= IN_CHANGE; 1522 ioflag = DOINGASYNC(vp) ? 0 : IO_SYNC; 1523 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1524 cnp->cn_proc); 1525 } 1526 cache_purge(vp); 1527 #ifdef UFS_DIRHASH 1528 /* Kill any active hash; i_effnlink == 0, so it will not come back. */ 1529 if (ip->i_dirhash != NULL) 1530 ufsdirhash_free(ip); 1531 #endif 1532 out: 1533 VN_KNOTE(vp, NOTE_DELETE); 1534 return (error); 1535 } 1536 1537 /* 1538 * symlink -- make a symbolic link 1539 */ 1540 int 1541 ufs_symlink(ap) 1542 struct vop_symlink_args /* { 1543 struct vnode *a_dvp; 1544 struct vnode **a_vpp; 1545 struct componentname *a_cnp; 1546 struct vattr *a_vap; 1547 char *a_target; 1548 } */ *ap; 1549 { 1550 register struct vnode *vp, **vpp = ap->a_vpp; 1551 register struct inode *ip; 1552 int len, error; 1553 1554 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1555 vpp, ap->a_cnp); 1556 if (error) 1557 return (error); 1558 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1559 vp = *vpp; 1560 len = strlen(ap->a_target); 1561 if (len < vp->v_mount->mnt_maxsymlinklen) { 1562 ip = VTOI(vp); 1563 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1564 ip->i_size = len; 1565 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1566 } else 1567 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1568 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, (int *)0, 1569 (struct proc *)0); 1570 if (error) 1571 vput(vp); 1572 return (error); 1573 } 1574 1575 /* 1576 * Vnode op for reading directories. 1577 * 1578 * The routine below assumes that the on-disk format of a directory 1579 * is the same as that defined by <sys/dirent.h>. If the on-disk 1580 * format changes, then it will be necessary to do a conversion 1581 * from the on-disk format that read returns to the format defined 1582 * by <sys/dirent.h>. 1583 */ 1584 int 1585 ufs_readdir(ap) 1586 struct vop_readdir_args /* { 1587 struct vnode *a_vp; 1588 struct uio *a_uio; 1589 struct ucred *a_cred; 1590 int *a_eofflag; 1591 int *ncookies; 1592 u_long **a_cookies; 1593 } */ *ap; 1594 { 1595 register struct uio *uio = ap->a_uio; 1596 int error; 1597 size_t count, lost; 1598 off_t off; 1599 1600 if (ap->a_ncookies != NULL) 1601 /* 1602 * Ensure that the block is aligned. The caller can use 1603 * the cookies to determine where in the block to start. 1604 */ 1605 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1606 off = uio->uio_offset; 1607 count = uio->uio_resid; 1608 /* Make sure we don't return partial entries. */ 1609 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1610 return (EINVAL); 1611 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1612 lost = uio->uio_resid - count; 1613 uio->uio_resid = count; 1614 uio->uio_iov->iov_len = count; 1615 # if (BYTE_ORDER == LITTLE_ENDIAN) 1616 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1617 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1618 } else { 1619 struct dirent *dp, *edp; 1620 struct uio auio; 1621 struct iovec aiov; 1622 caddr_t dirbuf; 1623 int readcnt; 1624 u_char tmp; 1625 1626 auio = *uio; 1627 auio.uio_iov = &aiov; 1628 auio.uio_iovcnt = 1; 1629 auio.uio_segflg = UIO_SYSSPACE; 1630 aiov.iov_len = count; 1631 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); 1632 aiov.iov_base = dirbuf; 1633 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1634 if (error == 0) { 1635 readcnt = count - auio.uio_resid; 1636 edp = (struct dirent *)&dirbuf[readcnt]; 1637 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1638 tmp = dp->d_namlen; 1639 dp->d_namlen = dp->d_type; 1640 dp->d_type = tmp; 1641 if (dp->d_reclen > 0) { 1642 dp = (struct dirent *) 1643 ((char *)dp + dp->d_reclen); 1644 } else { 1645 error = EIO; 1646 break; 1647 } 1648 } 1649 if (dp >= edp) 1650 error = uiomove(dirbuf, readcnt, uio); 1651 } 1652 FREE(dirbuf, M_TEMP); 1653 } 1654 # else 1655 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1656 # endif 1657 if (!error && ap->a_ncookies != NULL) { 1658 struct dirent* dpStart; 1659 struct dirent* dpEnd; 1660 struct dirent* dp; 1661 int ncookies; 1662 u_long *cookies; 1663 u_long *cookiep; 1664 1665 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1666 panic("ufs_readdir: unexpected uio from NFS server"); 1667 dpStart = (struct dirent *) 1668 (uio->uio_iov->iov_base - (uio->uio_offset - off)); 1669 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1670 for (dp = dpStart, ncookies = 0; 1671 dp < dpEnd; 1672 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1673 ncookies++; 1674 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1675 M_WAITOK); 1676 for (dp = dpStart, cookiep = cookies; 1677 dp < dpEnd; 1678 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1679 off += dp->d_reclen; 1680 *cookiep++ = (u_long) off; 1681 } 1682 *ap->a_ncookies = ncookies; 1683 *ap->a_cookies = cookies; 1684 } 1685 uio->uio_resid += lost; 1686 if (ap->a_eofflag) 1687 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1688 return (error); 1689 } 1690 1691 /* 1692 * Return target name of a symbolic link 1693 */ 1694 int 1695 ufs_readlink(ap) 1696 struct vop_readlink_args /* { 1697 struct vnode *a_vp; 1698 struct uio *a_uio; 1699 struct ucred *a_cred; 1700 } */ *ap; 1701 { 1702 register struct vnode *vp = ap->a_vp; 1703 register struct inode *ip = VTOI(vp); 1704 int isize; 1705 1706 isize = ip->i_size; 1707 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1708 (ip->i_din.di_blocks == 0)) { /* XXX - for old fastlink support */ 1709 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1710 return (0); 1711 } 1712 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1713 } 1714 1715 /* 1716 * Calculate the logical to physical mapping if not done already, 1717 * then call the device strategy routine. 1718 * 1719 * In order to be able to swap to a file, the VOP_BMAP operation may not 1720 * deadlock on memory. See ufs_bmap() for details. 1721 */ 1722 int 1723 ufs_strategy(ap) 1724 struct vop_strategy_args /* { 1725 struct vnode *a_vp; 1726 struct buf *a_bp; 1727 } */ *ap; 1728 { 1729 register struct buf *bp = ap->a_bp; 1730 register struct vnode *vp = ap->a_vp; 1731 register struct inode *ip; 1732 int error; 1733 1734 ip = VTOI(vp); 1735 if (vp->v_type == VBLK || vp->v_type == VCHR) 1736 panic("ufs_strategy: spec"); 1737 if (bp->b_blkno == bp->b_lblkno) { 1738 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL, NULL); 1739 if (error) { 1740 bp->b_error = error; 1741 bp->b_flags |= B_ERROR; 1742 biodone(bp); 1743 return (error); 1744 } 1745 if ((long)bp->b_blkno == -1) 1746 vfs_bio_clrbuf(bp); 1747 } 1748 if ((long)bp->b_blkno == -1) { 1749 biodone(bp); 1750 return (0); 1751 } 1752 vp = ip->i_devvp; 1753 bp->b_dev = vp->v_rdev; 1754 VOP_STRATEGY(vp, bp); 1755 return (0); 1756 } 1757 1758 /* 1759 * Print out the contents of an inode. 1760 */ 1761 int 1762 ufs_print(ap) 1763 struct vop_print_args /* { 1764 struct vnode *a_vp; 1765 } */ *ap; 1766 { 1767 register struct vnode *vp = ap->a_vp; 1768 register struct inode *ip = VTOI(vp); 1769 1770 printf("tag VT_UFS, ino %lu, on dev %s (%d, %d)", 1771 (u_long)ip->i_number, devtoname(ip->i_dev), major(ip->i_dev), 1772 minor(ip->i_dev)); 1773 if (vp->v_type == VFIFO) 1774 fifo_printinfo(vp); 1775 lockmgr_printinfo(&ip->i_lock); 1776 printf("\n"); 1777 return (0); 1778 } 1779 1780 /* 1781 * Read wrapper for special devices. 1782 */ 1783 int 1784 ufsspec_read(ap) 1785 struct vop_read_args /* { 1786 struct vnode *a_vp; 1787 struct uio *a_uio; 1788 int a_ioflag; 1789 struct ucred *a_cred; 1790 } */ *ap; 1791 { 1792 int error, resid; 1793 struct inode *ip; 1794 struct uio *uio; 1795 1796 uio = ap->a_uio; 1797 resid = uio->uio_resid; 1798 error = VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap); 1799 /* 1800 * The inode may have been revoked during the call, so it must not 1801 * be accessed blindly here or in the other wrapper functions. 1802 */ 1803 ip = VTOI(ap->a_vp); 1804 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 1805 ip->i_flag |= IN_ACCESS; 1806 return (error); 1807 } 1808 1809 /* 1810 * Write wrapper for special devices. 1811 */ 1812 int 1813 ufsspec_write(ap) 1814 struct vop_write_args /* { 1815 struct vnode *a_vp; 1816 struct uio *a_uio; 1817 int a_ioflag; 1818 struct ucred *a_cred; 1819 } */ *ap; 1820 { 1821 int error, resid; 1822 struct inode *ip; 1823 struct uio *uio; 1824 1825 uio = ap->a_uio; 1826 resid = uio->uio_resid; 1827 error = VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap); 1828 ip = VTOI(ap->a_vp); 1829 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 1830 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE; 1831 return (error); 1832 } 1833 1834 /* 1835 * Close wrapper for special devices. 1836 * 1837 * Update the times on the inode then do device close. 1838 */ 1839 int 1840 ufsspec_close(ap) 1841 struct vop_close_args /* { 1842 struct vnode *a_vp; 1843 int a_fflag; 1844 struct ucred *a_cred; 1845 struct proc *a_p; 1846 } */ *ap; 1847 { 1848 struct vnode *vp = ap->a_vp; 1849 1850 simple_lock(&vp->v_interlock); 1851 if (vp->v_usecount > 1) 1852 ufs_itimes(vp); 1853 simple_unlock(&vp->v_interlock); 1854 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 1855 } 1856 1857 /* 1858 * Read wrapper for fifos. 1859 */ 1860 int 1861 ufsfifo_read(ap) 1862 struct vop_read_args /* { 1863 struct vnode *a_vp; 1864 struct uio *a_uio; 1865 int a_ioflag; 1866 struct ucred *a_cred; 1867 } */ *ap; 1868 { 1869 int error, resid; 1870 struct inode *ip; 1871 struct uio *uio; 1872 1873 uio = ap->a_uio; 1874 resid = uio->uio_resid; 1875 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap); 1876 ip = VTOI(ap->a_vp); 1877 if ((ap->a_vp->v_mount->mnt_flag & MNT_NOATIME) == 0 && ip != NULL && 1878 (uio->uio_resid != resid || (error == 0 && resid != 0))) 1879 VTOI(ap->a_vp)->i_flag |= IN_ACCESS; 1880 return (error); 1881 } 1882 1883 /* 1884 * Write wrapper for fifos. 1885 */ 1886 int 1887 ufsfifo_write(ap) 1888 struct vop_write_args /* { 1889 struct vnode *a_vp; 1890 struct uio *a_uio; 1891 int a_ioflag; 1892 struct ucred *a_cred; 1893 } */ *ap; 1894 { 1895 int error, resid; 1896 struct inode *ip; 1897 struct uio *uio; 1898 1899 uio = ap->a_uio; 1900 resid = uio->uio_resid; 1901 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap); 1902 ip = VTOI(ap->a_vp); 1903 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 1904 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE; 1905 return (error); 1906 } 1907 1908 /* 1909 * Close wrapper for fifos. 1910 * 1911 * Update the times on the inode then do device close. 1912 */ 1913 int 1914 ufsfifo_close(ap) 1915 struct vop_close_args /* { 1916 struct vnode *a_vp; 1917 int a_fflag; 1918 struct ucred *a_cred; 1919 struct proc *a_p; 1920 } */ *ap; 1921 { 1922 struct vnode *vp = ap->a_vp; 1923 1924 simple_lock(&vp->v_interlock); 1925 if (vp->v_usecount > 1) 1926 ufs_itimes(vp); 1927 simple_unlock(&vp->v_interlock); 1928 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 1929 } 1930 1931 /* 1932 * Kqfilter wrapper for fifos. 1933 * 1934 * Fall through to ufs kqfilter routines if needed 1935 */ 1936 int 1937 ufsfifo_kqfilter(ap) 1938 struct vop_kqfilter_args *ap; 1939 { 1940 int error; 1941 1942 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_kqfilter), ap); 1943 if (error) 1944 error = ufs_kqfilter(ap); 1945 return (error); 1946 } 1947 1948 /* 1949 * Return POSIX pathconf information applicable to ufs filesystems. 1950 */ 1951 int 1952 ufs_pathconf(ap) 1953 struct vop_pathconf_args /* { 1954 struct vnode *a_vp; 1955 int a_name; 1956 int *a_retval; 1957 } */ *ap; 1958 { 1959 1960 switch (ap->a_name) { 1961 case _PC_LINK_MAX: 1962 *ap->a_retval = LINK_MAX; 1963 return (0); 1964 case _PC_NAME_MAX: 1965 *ap->a_retval = NAME_MAX; 1966 return (0); 1967 case _PC_PATH_MAX: 1968 *ap->a_retval = PATH_MAX; 1969 return (0); 1970 case _PC_PIPE_BUF: 1971 *ap->a_retval = PIPE_BUF; 1972 return (0); 1973 case _PC_CHOWN_RESTRICTED: 1974 *ap->a_retval = 1; 1975 return (0); 1976 case _PC_NO_TRUNC: 1977 *ap->a_retval = 1; 1978 return (0); 1979 default: 1980 return (EINVAL); 1981 } 1982 /* NOTREACHED */ 1983 } 1984 1985 /* 1986 * Advisory record locking support 1987 */ 1988 int 1989 ufs_advlock(ap) 1990 struct vop_advlock_args /* { 1991 struct vnode *a_vp; 1992 caddr_t a_id; 1993 int a_op; 1994 struct flock *a_fl; 1995 int a_flags; 1996 } */ *ap; 1997 { 1998 register struct inode *ip = VTOI(ap->a_vp); 1999 2000 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size)); 2001 } 2002 2003 /* 2004 * Initialize the vnode associated with a new inode, handle aliased 2005 * vnodes. 2006 */ 2007 int 2008 ufs_vinit(mntp, specops, fifoops, vpp) 2009 struct mount *mntp; 2010 vop_t **specops; 2011 vop_t **fifoops; 2012 struct vnode **vpp; 2013 { 2014 struct inode *ip; 2015 struct vnode *vp; 2016 struct timeval tv; 2017 2018 vp = *vpp; 2019 ip = VTOI(vp); 2020 switch(vp->v_type = IFTOVT(ip->i_mode)) { 2021 case VCHR: 2022 case VBLK: 2023 vp->v_op = specops; 2024 addaliasu(vp, ip->i_rdev); 2025 break; 2026 case VFIFO: 2027 vp->v_op = fifoops; 2028 break; 2029 default: 2030 break; 2031 2032 } 2033 if (ip->i_number == ROOTINO) 2034 vp->v_flag |= VROOT; 2035 /* 2036 * Initialize modrev times 2037 */ 2038 getmicrouptime(&tv); 2039 SETHIGH(ip->i_modrev, tv.tv_sec); 2040 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 2041 *vpp = vp; 2042 return (0); 2043 } 2044 2045 /* 2046 * Allocate a new inode. 2047 */ 2048 int 2049 ufs_makeinode(mode, dvp, vpp, cnp) 2050 int mode; 2051 struct vnode *dvp; 2052 struct vnode **vpp; 2053 struct componentname *cnp; 2054 { 2055 register struct inode *ip, *pdir; 2056 struct direct newdir; 2057 struct vnode *tvp; 2058 int error; 2059 2060 pdir = VTOI(dvp); 2061 #ifdef DIAGNOSTIC 2062 if ((cnp->cn_flags & HASBUF) == 0) 2063 panic("ufs_makeinode: no name"); 2064 #endif 2065 *vpp = NULL; 2066 if ((mode & IFMT) == 0) 2067 mode |= IFREG; 2068 2069 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2070 if (error) 2071 return (error); 2072 ip = VTOI(tvp); 2073 ip->i_gid = pdir->i_gid; 2074 #ifdef SUIDDIR 2075 { 2076 #ifdef QUOTA 2077 struct ucred ucred, *ucp; 2078 ucp = cnp->cn_cred; 2079 #endif 2080 /* 2081 * If we are not the owner of the directory, 2082 * and we are hacking owners here, (only do this where told to) 2083 * and we are not giving it TO root, (would subvert quotas) 2084 * then go ahead and give it to the other user. 2085 * Note that this drops off the execute bits for security. 2086 */ 2087 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2088 (pdir->i_mode & ISUID) && 2089 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2090 ip->i_uid = pdir->i_uid; 2091 mode &= ~07111; 2092 #ifdef QUOTA 2093 /* 2094 * Make sure the correct user gets charged 2095 * for the space. 2096 * Quickly knock up a dummy credential for the victim. 2097 * XXX This seems to never be accessed out of our 2098 * context so a stack variable is ok. 2099 */ 2100 ucred.cr_ref = 1; 2101 ucred.cr_uid = ip->i_uid; 2102 ucred.cr_ngroups = 1; 2103 ucred.cr_groups[0] = pdir->i_gid; 2104 ucp = &ucred; 2105 #endif 2106 } else 2107 ip->i_uid = cnp->cn_cred->cr_uid; 2108 2109 #ifdef QUOTA 2110 if ((error = getinoquota(ip)) || 2111 (error = chkiq(ip, 1, ucp, 0))) { 2112 UFS_VFREE(tvp, ip->i_number, mode); 2113 vput(tvp); 2114 return (error); 2115 } 2116 #endif 2117 } 2118 #else /* !SUIDDIR */ 2119 ip->i_uid = cnp->cn_cred->cr_uid; 2120 #ifdef QUOTA 2121 if ((error = getinoquota(ip)) || 2122 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2123 UFS_VFREE(tvp, ip->i_number, mode); 2124 vput(tvp); 2125 return (error); 2126 } 2127 #endif 2128 #endif /* !SUIDDIR */ 2129 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2130 ip->i_mode = mode; 2131 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2132 ip->i_effnlink = 1; 2133 ip->i_nlink = 1; 2134 if (DOINGSOFTDEP(tvp)) 2135 softdep_change_linkcnt(ip); 2136 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2137 suser_xxx(cnp->cn_cred, 0, 0)) 2138 ip->i_mode &= ~ISGID; 2139 2140 if (cnp->cn_flags & ISWHITEOUT) 2141 ip->i_flags |= UF_OPAQUE; 2142 2143 /* 2144 * Make sure inode goes to disk before directory entry. 2145 */ 2146 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2147 if (error) 2148 goto bad; 2149 ufs_makedirentry(ip, cnp, &newdir); 2150 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2151 if (error) 2152 goto bad; 2153 *vpp = tvp; 2154 return (0); 2155 2156 bad: 2157 /* 2158 * Write error occurred trying to update the inode 2159 * or the directory so must deallocate the inode. 2160 */ 2161 ip->i_effnlink = 0; 2162 ip->i_nlink = 0; 2163 ip->i_flag |= IN_CHANGE; 2164 if (DOINGSOFTDEP(tvp)) 2165 softdep_change_linkcnt(ip); 2166 vput(tvp); 2167 return (error); 2168 } 2169 2170 static int 2171 ufs_missingop(ap) 2172 struct vop_generic_args *ap; 2173 { 2174 2175 panic("no vop function for %s in ufs child", ap->a_desc->vdesc_name); 2176 return (EOPNOTSUPP); 2177 } 2178 2179 static struct filterops ufsread_filtops = 2180 { 1, NULL, filt_ufsdetach, filt_ufsread }; 2181 static struct filterops ufswrite_filtops = 2182 { 1, NULL, filt_ufsdetach, filt_ufswrite }; 2183 static struct filterops ufsvnode_filtops = 2184 { 1, NULL, filt_ufsdetach, filt_ufsvnode }; 2185 2186 static int 2187 ufs_kqfilter(ap) 2188 struct vop_kqfilter_args /* { 2189 struct vnode *a_vp; 2190 struct knote *a_kn; 2191 } */ *ap; 2192 { 2193 struct vnode *vp = ap->a_vp; 2194 struct knote *kn = ap->a_kn; 2195 2196 switch (kn->kn_filter) { 2197 case EVFILT_READ: 2198 kn->kn_fop = &ufsread_filtops; 2199 break; 2200 case EVFILT_WRITE: 2201 kn->kn_fop = &ufswrite_filtops; 2202 break; 2203 case EVFILT_VNODE: 2204 kn->kn_fop = &ufsvnode_filtops; 2205 break; 2206 default: 2207 return (1); 2208 } 2209 2210 kn->kn_hook = (caddr_t)vp; 2211 2212 simple_lock(&vp->v_pollinfo.vpi_lock); 2213 SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext); 2214 simple_unlock(&vp->v_pollinfo.vpi_lock); 2215 2216 return (0); 2217 } 2218 2219 static void 2220 filt_ufsdetach(struct knote *kn) 2221 { 2222 struct vnode *vp = (struct vnode *)kn->kn_hook; 2223 2224 simple_lock(&vp->v_pollinfo.vpi_lock); 2225 SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note, 2226 kn, knote, kn_selnext); 2227 simple_unlock(&vp->v_pollinfo.vpi_lock); 2228 } 2229 2230 /*ARGSUSED*/ 2231 static int 2232 filt_ufsread(struct knote *kn, long hint) 2233 { 2234 struct vnode *vp = (struct vnode *)kn->kn_hook; 2235 struct inode *ip = VTOI(vp); 2236 2237 /* 2238 * filesystem is gone, so set the EOF flag and schedule 2239 * the knote for deletion. 2240 */ 2241 if (hint == NOTE_REVOKE) { 2242 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2243 return (1); 2244 } 2245 2246 kn->kn_data = ip->i_size - kn->kn_fp->f_offset; 2247 return (kn->kn_data != 0); 2248 } 2249 2250 /*ARGSUSED*/ 2251 static int 2252 filt_ufswrite(struct knote *kn, long hint) 2253 { 2254 2255 /* 2256 * filesystem is gone, so set the EOF flag and schedule 2257 * the knote for deletion. 2258 */ 2259 if (hint == NOTE_REVOKE) 2260 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2261 2262 kn->kn_data = 0; 2263 return (1); 2264 } 2265 2266 static int 2267 filt_ufsvnode(struct knote *kn, long hint) 2268 { 2269 2270 if (kn->kn_sfflags & hint) 2271 kn->kn_fflags |= hint; 2272 if (hint == NOTE_REVOKE) { 2273 kn->kn_flags |= EV_EOF; 2274 return (1); 2275 } 2276 return (kn->kn_fflags != 0); 2277 } 2278 2279 /* Global vfs data structures for ufs. */ 2280 static vop_t **ufs_vnodeop_p; 2281 static struct vnodeopv_entry_desc ufs_vnodeop_entries[] = { 2282 { &vop_default_desc, (vop_t *) vop_defaultop }, 2283 { &vop_fsync_desc, (vop_t *) ufs_missingop }, 2284 { &vop_read_desc, (vop_t *) ufs_missingop }, 2285 { &vop_reallocblks_desc, (vop_t *) ufs_missingop }, 2286 { &vop_write_desc, (vop_t *) ufs_missingop }, 2287 { &vop_access_desc, (vop_t *) ufs_access }, 2288 { &vop_advlock_desc, (vop_t *) ufs_advlock }, 2289 { &vop_bmap_desc, (vop_t *) ufs_bmap }, 2290 { &vop_cachedlookup_desc, (vop_t *) ufs_lookup }, 2291 { &vop_close_desc, (vop_t *) ufs_close }, 2292 { &vop_create_desc, (vop_t *) ufs_create }, 2293 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2294 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2295 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 2296 { &vop_link_desc, (vop_t *) ufs_link }, 2297 { &vop_lock_desc, (vop_t *) vop_stdlock }, 2298 { &vop_lookup_desc, (vop_t *) vfs_cache_lookup }, 2299 { &vop_mkdir_desc, (vop_t *) ufs_mkdir }, 2300 { &vop_mknod_desc, (vop_t *) ufs_mknod }, 2301 { &vop_mmap_desc, (vop_t *) ufs_mmap }, 2302 { &vop_open_desc, (vop_t *) ufs_open }, 2303 { &vop_pathconf_desc, (vop_t *) ufs_pathconf }, 2304 { &vop_poll_desc, (vop_t *) vop_stdpoll }, 2305 { &vop_kqfilter_desc, (vop_t *) ufs_kqfilter }, 2306 { &vop_print_desc, (vop_t *) ufs_print }, 2307 { &vop_readdir_desc, (vop_t *) ufs_readdir }, 2308 { &vop_readlink_desc, (vop_t *) ufs_readlink }, 2309 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2310 { &vop_remove_desc, (vop_t *) ufs_remove }, 2311 { &vop_rename_desc, (vop_t *) ufs_rename }, 2312 { &vop_rmdir_desc, (vop_t *) ufs_rmdir }, 2313 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2314 { &vop_strategy_desc, (vop_t *) ufs_strategy }, 2315 { &vop_symlink_desc, (vop_t *) ufs_symlink }, 2316 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 2317 { &vop_whiteout_desc, (vop_t *) ufs_whiteout }, 2318 { NULL, NULL } 2319 }; 2320 static struct vnodeopv_desc ufs_vnodeop_opv_desc = 2321 { &ufs_vnodeop_p, ufs_vnodeop_entries }; 2322 2323 static vop_t **ufs_specop_p; 2324 static struct vnodeopv_entry_desc ufs_specop_entries[] = { 2325 { &vop_default_desc, (vop_t *) spec_vnoperate }, 2326 { &vop_fsync_desc, (vop_t *) ufs_missingop }, 2327 { &vop_access_desc, (vop_t *) ufs_access }, 2328 { &vop_close_desc, (vop_t *) ufsspec_close }, 2329 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2330 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2331 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 2332 { &vop_lock_desc, (vop_t *) vop_stdlock }, 2333 { &vop_print_desc, (vop_t *) ufs_print }, 2334 { &vop_read_desc, (vop_t *) ufsspec_read }, 2335 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2336 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2337 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 2338 { &vop_write_desc, (vop_t *) ufsspec_write }, 2339 { NULL, NULL } 2340 }; 2341 static struct vnodeopv_desc ufs_specop_opv_desc = 2342 { &ufs_specop_p, ufs_specop_entries }; 2343 2344 static vop_t **ufs_fifoop_p; 2345 static struct vnodeopv_entry_desc ufs_fifoop_entries[] = { 2346 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 2347 { &vop_fsync_desc, (vop_t *) ufs_missingop }, 2348 { &vop_access_desc, (vop_t *) ufs_access }, 2349 { &vop_close_desc, (vop_t *) ufsfifo_close }, 2350 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2351 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2352 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 2353 { &vop_kqfilter_desc, (vop_t *) ufsfifo_kqfilter }, 2354 { &vop_lock_desc, (vop_t *) vop_stdlock }, 2355 { &vop_print_desc, (vop_t *) ufs_print }, 2356 { &vop_read_desc, (vop_t *) ufsfifo_read }, 2357 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2358 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2359 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 2360 { &vop_write_desc, (vop_t *) ufsfifo_write }, 2361 { NULL, NULL } 2362 }; 2363 static struct vnodeopv_desc ufs_fifoop_opv_desc = 2364 { &ufs_fifoop_p, ufs_fifoop_entries }; 2365 2366 VNODEOP_SET(ufs_vnodeop_opv_desc); 2367 VNODEOP_SET(ufs_specop_opv_desc); 2368 VNODEOP_SET(ufs_fifoop_opv_desc); 2369 2370 int 2371 ufs_vnoperate(ap) 2372 struct vop_generic_args /* { 2373 struct vnodeop_desc *a_desc; 2374 } */ *ap; 2375 { 2376 return (VOCALL(ufs_vnodeop_p, ap->a_desc->vdesc_offset, ap)); 2377 } 2378 2379 int 2380 ufs_vnoperatefifo(ap) 2381 struct vop_generic_args /* { 2382 struct vnodeop_desc *a_desc; 2383 } */ *ap; 2384 { 2385 return (VOCALL(ufs_fifoop_p, ap->a_desc->vdesc_offset, ap)); 2386 } 2387 2388 int 2389 ufs_vnoperatespec(ap) 2390 struct vop_generic_args /* { 2391 struct vnodeop_desc *a_desc; 2392 } */ *ap; 2393 { 2394 return (VOCALL(ufs_specop_p, ap->a_desc->vdesc_offset, ap)); 2395 }
Cache object: b524f78875932f803b51bd3a8491cde8
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