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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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD: releng/8.0/sys/ufs/ufs/ufs_vnops.c 197473 2009-09-24 21:32:56Z brooks $"); 39 40 #include "opt_quota.h" 41 #include "opt_suiddir.h" 42 #include "opt_ufs.h" 43 #include "opt_ffs.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/malloc.h> 48 #include <sys/namei.h> 49 #include <sys/kernel.h> 50 #include <sys/fcntl.h> 51 #include <sys/stat.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/mount.h> 55 #include <sys/priv.h> 56 #include <sys/refcount.h> 57 #include <sys/unistd.h> 58 #include <sys/vnode.h> 59 #include <sys/dirent.h> 60 #include <sys/lockf.h> 61 #include <sys/conf.h> 62 #include <sys/acl.h> 63 64 #include <machine/mutex.h> 65 66 #include <security/mac/mac_framework.h> 67 68 #include <sys/file.h> /* XXX */ 69 70 #include <vm/vm.h> 71 #include <vm/vm_extern.h> 72 73 #include <fs/fifofs/fifo.h> 74 75 #include <ufs/ufs/acl.h> 76 #include <ufs/ufs/extattr.h> 77 #include <ufs/ufs/quota.h> 78 #include <ufs/ufs/inode.h> 79 #include <ufs/ufs/dir.h> 80 #include <ufs/ufs/ufsmount.h> 81 #include <ufs/ufs/ufs_extern.h> 82 #ifdef UFS_DIRHASH 83 #include <ufs/ufs/dirhash.h> 84 #endif 85 #ifdef UFS_GJOURNAL 86 #include <ufs/ufs/gjournal.h> 87 #endif 88 89 #include <ufs/ffs/ffs_extern.h> 90 91 static vop_access_t ufs_access; 92 static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *); 93 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *); 94 static vop_close_t ufs_close; 95 static vop_create_t ufs_create; 96 static vop_getattr_t ufs_getattr; 97 static vop_link_t ufs_link; 98 static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 99 static vop_markatime_t ufs_markatime; 100 static vop_mkdir_t ufs_mkdir; 101 static vop_mknod_t ufs_mknod; 102 static vop_open_t ufs_open; 103 static vop_pathconf_t ufs_pathconf; 104 static vop_print_t ufs_print; 105 static vop_readlink_t ufs_readlink; 106 static vop_remove_t ufs_remove; 107 static vop_rename_t ufs_rename; 108 static vop_rmdir_t ufs_rmdir; 109 static vop_setattr_t ufs_setattr; 110 static vop_strategy_t ufs_strategy; 111 static vop_symlink_t ufs_symlink; 112 static vop_whiteout_t ufs_whiteout; 113 static vop_close_t ufsfifo_close; 114 static vop_kqfilter_t ufsfifo_kqfilter; 115 static vop_pathconf_t ufsfifo_pathconf; 116 117 /* 118 * A virgin directory (no blushing please). 119 */ 120 static struct dirtemplate mastertemplate = { 121 0, 12, DT_DIR, 1, ".", 122 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." 123 }; 124 static struct odirtemplate omastertemplate = { 125 0, 12, 1, ".", 126 0, DIRBLKSIZ - 12, 2, ".." 127 }; 128 129 static void 130 ufs_itimes_locked(struct vnode *vp) 131 { 132 struct inode *ip; 133 struct timespec ts; 134 135 ASSERT_VI_LOCKED(vp, __func__); 136 137 ip = VTOI(vp); 138 if (UFS_RDONLY(ip)) 139 goto out; 140 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 141 return; 142 143 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp)) 144 ip->i_flag |= IN_LAZYMOD; 145 else if (((vp->v_mount->mnt_kern_flag & 146 (MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) || 147 (ip->i_flag & (IN_CHANGE | IN_UPDATE))) 148 ip->i_flag |= IN_MODIFIED; 149 else if (ip->i_flag & IN_ACCESS) 150 ip->i_flag |= IN_LAZYACCESS; 151 vfs_timestamp(&ts); 152 if (ip->i_flag & IN_ACCESS) { 153 DIP_SET(ip, i_atime, ts.tv_sec); 154 DIP_SET(ip, i_atimensec, ts.tv_nsec); 155 } 156 if (ip->i_flag & IN_UPDATE) { 157 DIP_SET(ip, i_mtime, ts.tv_sec); 158 DIP_SET(ip, i_mtimensec, ts.tv_nsec); 159 } 160 if (ip->i_flag & IN_CHANGE) { 161 DIP_SET(ip, i_ctime, ts.tv_sec); 162 DIP_SET(ip, i_ctimensec, ts.tv_nsec); 163 DIP_SET(ip, i_modrev, DIP(ip, i_modrev) + 1); 164 } 165 166 out: 167 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 168 } 169 170 void 171 ufs_itimes(struct vnode *vp) 172 { 173 174 VI_LOCK(vp); 175 ufs_itimes_locked(vp); 176 VI_UNLOCK(vp); 177 } 178 179 /* 180 * Create a regular file 181 */ 182 static int 183 ufs_create(ap) 184 struct vop_create_args /* { 185 struct vnode *a_dvp; 186 struct vnode **a_vpp; 187 struct componentname *a_cnp; 188 struct vattr *a_vap; 189 } */ *ap; 190 { 191 int error; 192 193 error = 194 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 195 ap->a_dvp, ap->a_vpp, ap->a_cnp); 196 if (error) 197 return (error); 198 return (0); 199 } 200 201 /* 202 * Mknod vnode call 203 */ 204 /* ARGSUSED */ 205 static int 206 ufs_mknod(ap) 207 struct vop_mknod_args /* { 208 struct vnode *a_dvp; 209 struct vnode **a_vpp; 210 struct componentname *a_cnp; 211 struct vattr *a_vap; 212 } */ *ap; 213 { 214 struct vattr *vap = ap->a_vap; 215 struct vnode **vpp = ap->a_vpp; 216 struct inode *ip; 217 ino_t ino; 218 int error; 219 220 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 221 ap->a_dvp, vpp, ap->a_cnp); 222 if (error) 223 return (error); 224 ip = VTOI(*vpp); 225 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 226 if (vap->va_rdev != VNOVAL) { 227 /* 228 * Want to be able to use this to make badblock 229 * inodes, so don't truncate the dev number. 230 */ 231 DIP_SET(ip, i_rdev, vap->va_rdev); 232 } 233 /* 234 * Remove inode, then reload it through VFS_VGET so it is 235 * checked to see if it is an alias of an existing entry in 236 * the inode cache. XXX I don't believe this is necessary now. 237 */ 238 (*vpp)->v_type = VNON; 239 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 240 vgone(*vpp); 241 vput(*vpp); 242 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 243 if (error) { 244 *vpp = NULL; 245 return (error); 246 } 247 return (0); 248 } 249 250 /* 251 * Open called. 252 */ 253 /* ARGSUSED */ 254 static int 255 ufs_open(struct vop_open_args *ap) 256 { 257 struct vnode *vp = ap->a_vp; 258 struct inode *ip; 259 260 if (vp->v_type == VCHR || vp->v_type == VBLK) 261 return (EOPNOTSUPP); 262 263 ip = VTOI(vp); 264 /* 265 * Files marked append-only must be opened for appending. 266 */ 267 if ((ip->i_flags & APPEND) && 268 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 269 return (EPERM); 270 vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td); 271 return (0); 272 } 273 274 /* 275 * Close called. 276 * 277 * Update the times on the inode. 278 */ 279 /* ARGSUSED */ 280 static int 281 ufs_close(ap) 282 struct vop_close_args /* { 283 struct vnode *a_vp; 284 int a_fflag; 285 struct ucred *a_cred; 286 struct thread *a_td; 287 } */ *ap; 288 { 289 struct vnode *vp = ap->a_vp; 290 int usecount; 291 292 VI_LOCK(vp); 293 usecount = vp->v_usecount; 294 if (usecount > 1) 295 ufs_itimes_locked(vp); 296 VI_UNLOCK(vp); 297 return (0); 298 } 299 300 static int 301 ufs_access(ap) 302 struct vop_access_args /* { 303 struct vnode *a_vp; 304 accmode_t a_accmode; 305 struct ucred *a_cred; 306 struct thread *a_td; 307 } */ *ap; 308 { 309 struct vnode *vp = ap->a_vp; 310 struct inode *ip = VTOI(vp); 311 accmode_t accmode = ap->a_accmode; 312 int error; 313 #ifdef QUOTA 314 int relocked; 315 #endif 316 #ifdef UFS_ACL 317 struct acl *acl; 318 #endif 319 320 /* 321 * Disallow write attempts on read-only filesystems; 322 * unless the file is a socket, fifo, or a block or 323 * character device resident on the filesystem. 324 */ 325 if (accmode & VWRITE) { 326 switch (vp->v_type) { 327 case VDIR: 328 case VLNK: 329 case VREG: 330 if (vp->v_mount->mnt_flag & MNT_RDONLY) 331 return (EROFS); 332 #ifdef QUOTA 333 /* 334 * Inode is accounted in the quotas only if struct 335 * dquot is attached to it. VOP_ACCESS() is called 336 * from vn_open_cred() and provides a convenient 337 * point to call getinoquota(). 338 */ 339 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 340 341 /* 342 * Upgrade vnode lock, since getinoquota() 343 * requires exclusive lock to modify inode. 344 */ 345 relocked = 1; 346 vhold(vp); 347 vn_lock(vp, LK_UPGRADE | LK_RETRY); 348 VI_LOCK(vp); 349 if (vp->v_iflag & VI_DOOMED) { 350 vdropl(vp); 351 error = ENOENT; 352 goto relock; 353 } 354 vdropl(vp); 355 } else 356 relocked = 0; 357 error = getinoquota(ip); 358 relock: 359 if (relocked) 360 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 361 if (error != 0) 362 return (error); 363 #endif 364 break; 365 default: 366 break; 367 } 368 } 369 370 /* If immutable bit set, nobody gets to write it. */ 371 if ((accmode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT))) 372 return (EPERM); 373 374 #ifdef UFS_ACL 375 if ((vp->v_mount->mnt_flag & MNT_ACLS) != 0) { 376 acl = acl_alloc(M_WAITOK); 377 error = VOP_GETACL(vp, ACL_TYPE_ACCESS, acl, ap->a_cred, 378 ap->a_td); 379 switch (error) { 380 case EOPNOTSUPP: 381 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 382 ip->i_gid, ap->a_accmode, ap->a_cred, NULL); 383 break; 384 case 0: 385 error = vaccess_acl_posix1e(vp->v_type, ip->i_uid, 386 ip->i_gid, acl, ap->a_accmode, ap->a_cred, NULL); 387 break; 388 default: 389 printf( 390 "ufs_access(): Error retrieving ACL on object (%d).\n", 391 error); 392 /* 393 * XXX: Fall back until debugged. Should 394 * eventually possibly log an error, and return 395 * EPERM for safety. 396 */ 397 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 398 ip->i_gid, ap->a_accmode, ap->a_cred, NULL); 399 } 400 acl_free(acl); 401 } else 402 #endif /* !UFS_ACL */ 403 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 404 ap->a_accmode, ap->a_cred, NULL); 405 return (error); 406 } 407 408 /* ARGSUSED */ 409 static int 410 ufs_getattr(ap) 411 struct vop_getattr_args /* { 412 struct vnode *a_vp; 413 struct vattr *a_vap; 414 struct ucred *a_cred; 415 } */ *ap; 416 { 417 struct vnode *vp = ap->a_vp; 418 struct inode *ip = VTOI(vp); 419 struct vattr *vap = ap->a_vap; 420 421 VI_LOCK(vp); 422 ufs_itimes_locked(vp); 423 if (ip->i_ump->um_fstype == UFS1) { 424 vap->va_atime.tv_sec = ip->i_din1->di_atime; 425 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec; 426 } else { 427 vap->va_atime.tv_sec = ip->i_din2->di_atime; 428 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec; 429 } 430 VI_UNLOCK(vp); 431 /* 432 * Copy from inode table 433 */ 434 vap->va_fsid = dev2udev(ip->i_dev); 435 vap->va_fileid = ip->i_number; 436 vap->va_mode = ip->i_mode & ~IFMT; 437 vap->va_nlink = ip->i_effnlink; 438 vap->va_uid = ip->i_uid; 439 vap->va_gid = ip->i_gid; 440 if (ip->i_ump->um_fstype == UFS1) { 441 vap->va_rdev = ip->i_din1->di_rdev; 442 vap->va_size = ip->i_din1->di_size; 443 vap->va_mtime.tv_sec = ip->i_din1->di_mtime; 444 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec; 445 vap->va_ctime.tv_sec = ip->i_din1->di_ctime; 446 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec; 447 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks); 448 vap->va_filerev = ip->i_din1->di_modrev; 449 } else { 450 vap->va_rdev = ip->i_din2->di_rdev; 451 vap->va_size = ip->i_din2->di_size; 452 vap->va_mtime.tv_sec = ip->i_din2->di_mtime; 453 vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec; 454 vap->va_ctime.tv_sec = ip->i_din2->di_ctime; 455 vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec; 456 vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime; 457 vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec; 458 vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks); 459 vap->va_filerev = ip->i_din2->di_modrev; 460 } 461 vap->va_flags = ip->i_flags; 462 vap->va_gen = ip->i_gen; 463 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 464 vap->va_type = IFTOVT(ip->i_mode); 465 return (0); 466 } 467 468 /* 469 * Set attribute vnode op. called from several syscalls 470 */ 471 static int 472 ufs_setattr(ap) 473 struct vop_setattr_args /* { 474 struct vnode *a_vp; 475 struct vattr *a_vap; 476 struct ucred *a_cred; 477 } */ *ap; 478 { 479 struct vattr *vap = ap->a_vap; 480 struct vnode *vp = ap->a_vp; 481 struct inode *ip = VTOI(vp); 482 struct ucred *cred = ap->a_cred; 483 struct thread *td = curthread; 484 int error; 485 486 /* 487 * Check for unsettable attributes. 488 */ 489 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 490 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 491 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 492 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 493 return (EINVAL); 494 } 495 if (vap->va_flags != VNOVAL) { 496 if (vp->v_mount->mnt_flag & MNT_RDONLY) 497 return (EROFS); 498 /* 499 * Callers may only modify the file flags on objects they 500 * have VADMIN rights for. 501 */ 502 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 503 return (error); 504 /* 505 * Unprivileged processes are not permitted to unset system 506 * flags, or modify flags if any system flags are set. 507 * Privileged non-jail processes may not modify system flags 508 * if securelevel > 0 and any existing system flags are set. 509 * Privileged jail processes behave like privileged non-jail 510 * processes if the security.jail.chflags_allowed sysctl is 511 * is non-zero; otherwise, they behave like unprivileged 512 * processes. 513 */ 514 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 515 if (ip->i_flags 516 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 517 error = securelevel_gt(cred, 0); 518 if (error) 519 return (error); 520 } 521 /* Snapshot flag cannot be set or cleared */ 522 if (((vap->va_flags & SF_SNAPSHOT) != 0 && 523 (ip->i_flags & SF_SNAPSHOT) == 0) || 524 ((vap->va_flags & SF_SNAPSHOT) == 0 && 525 (ip->i_flags & SF_SNAPSHOT) != 0)) 526 return (EPERM); 527 ip->i_flags = vap->va_flags; 528 DIP_SET(ip, i_flags, vap->va_flags); 529 } else { 530 if (ip->i_flags 531 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 532 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 533 return (EPERM); 534 ip->i_flags &= SF_SETTABLE; 535 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 536 DIP_SET(ip, i_flags, ip->i_flags); 537 } 538 ip->i_flag |= IN_CHANGE; 539 if (vap->va_flags & (IMMUTABLE | APPEND)) 540 return (0); 541 } 542 if (ip->i_flags & (IMMUTABLE | APPEND)) 543 return (EPERM); 544 /* 545 * Go through the fields and update iff not VNOVAL. 546 */ 547 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 548 if (vp->v_mount->mnt_flag & MNT_RDONLY) 549 return (EROFS); 550 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, 551 td)) != 0) 552 return (error); 553 } 554 if (vap->va_size != VNOVAL) { 555 /* 556 * XXX most of the following special cases should be in 557 * callers instead of in N filesystems. The VDIR check 558 * mostly already is. 559 */ 560 switch (vp->v_type) { 561 case VDIR: 562 return (EISDIR); 563 case VLNK: 564 case VREG: 565 /* 566 * Truncation should have an effect in these cases. 567 * Disallow it if the filesystem is read-only or 568 * the file is being snapshotted. 569 */ 570 if (vp->v_mount->mnt_flag & MNT_RDONLY) 571 return (EROFS); 572 if ((ip->i_flags & SF_SNAPSHOT) != 0) 573 return (EPERM); 574 break; 575 default: 576 /* 577 * According to POSIX, the result is unspecified 578 * for file types other than regular files, 579 * directories and shared memory objects. We 580 * don't support shared memory objects in the file 581 * system, and have dubious support for truncating 582 * symlinks. Just ignore the request in other cases. 583 */ 584 return (0); 585 } 586 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL, 587 cred, td)) != 0) 588 return (error); 589 } 590 if (vap->va_atime.tv_sec != VNOVAL || 591 vap->va_mtime.tv_sec != VNOVAL || 592 vap->va_birthtime.tv_sec != VNOVAL) { 593 if (vp->v_mount->mnt_flag & MNT_RDONLY) 594 return (EROFS); 595 if ((ip->i_flags & SF_SNAPSHOT) != 0) 596 return (EPERM); 597 /* 598 * From utimes(2): 599 * If times is NULL, ... The caller must be the owner of 600 * the file, have permission to write the file, or be the 601 * super-user. 602 * If times is non-NULL, ... The caller must be the owner of 603 * the file or be the super-user. 604 * 605 * Possibly for historical reasons, try to use VADMIN in 606 * preference to VWRITE for a NULL timestamp. This means we 607 * will return EACCES in preference to EPERM if neither 608 * check succeeds. 609 */ 610 if (vap->va_vaflags & VA_UTIMES_NULL) { 611 error = VOP_ACCESS(vp, VADMIN, cred, td); 612 if (error) 613 error = VOP_ACCESS(vp, VWRITE, cred, td); 614 } else 615 error = VOP_ACCESS(vp, VADMIN, cred, td); 616 if (error) 617 return (error); 618 if (vap->va_atime.tv_sec != VNOVAL) 619 ip->i_flag |= IN_ACCESS; 620 if (vap->va_mtime.tv_sec != VNOVAL) 621 ip->i_flag |= IN_CHANGE | IN_UPDATE; 622 if (vap->va_birthtime.tv_sec != VNOVAL && 623 ip->i_ump->um_fstype == UFS2) 624 ip->i_flag |= IN_MODIFIED; 625 ufs_itimes(vp); 626 if (vap->va_atime.tv_sec != VNOVAL) { 627 DIP_SET(ip, i_atime, vap->va_atime.tv_sec); 628 DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec); 629 } 630 if (vap->va_mtime.tv_sec != VNOVAL) { 631 DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec); 632 DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec); 633 } 634 if (vap->va_birthtime.tv_sec != VNOVAL && 635 ip->i_ump->um_fstype == UFS2) { 636 ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec; 637 ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec; 638 } 639 error = UFS_UPDATE(vp, 0); 640 if (error) 641 return (error); 642 } 643 error = 0; 644 if (vap->va_mode != (mode_t)VNOVAL) { 645 if (vp->v_mount->mnt_flag & MNT_RDONLY) 646 return (EROFS); 647 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode & 648 (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH))) 649 return (EPERM); 650 error = ufs_chmod(vp, (int)vap->va_mode, cred, td); 651 } 652 return (error); 653 } 654 655 /* 656 * Mark this file's access time for update for vfs_mark_atime(). This 657 * is called from execve() and mmap(). 658 */ 659 static int 660 ufs_markatime(ap) 661 struct vop_markatime_args /* { 662 struct vnode *a_vp; 663 } */ *ap; 664 { 665 struct vnode *vp = ap->a_vp; 666 struct inode *ip = VTOI(vp); 667 668 VI_LOCK(vp); 669 ip->i_flag |= IN_ACCESS; 670 VI_UNLOCK(vp); 671 return (0); 672 } 673 674 /* 675 * Change the mode on a file. 676 * Inode must be locked before calling. 677 */ 678 static int 679 ufs_chmod(vp, mode, cred, td) 680 struct vnode *vp; 681 int mode; 682 struct ucred *cred; 683 struct thread *td; 684 { 685 struct inode *ip = VTOI(vp); 686 int error; 687 688 /* 689 * To modify the permissions on a file, must possess VADMIN 690 * for that file. 691 */ 692 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 693 return (error); 694 /* 695 * Privileged processes may set the sticky bit on non-directories, 696 * as well as set the setgid bit on a file with a group that the 697 * process is not a member of. Both of these are allowed in 698 * jail(8). 699 */ 700 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 701 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 702 return (EFTYPE); 703 } 704 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 705 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 706 if (error) 707 return (error); 708 } 709 ip->i_mode &= ~ALLPERMS; 710 ip->i_mode |= (mode & ALLPERMS); 711 DIP_SET(ip, i_mode, ip->i_mode); 712 ip->i_flag |= IN_CHANGE; 713 return (0); 714 } 715 716 /* 717 * Perform chown operation on inode ip; 718 * inode must be locked prior to call. 719 */ 720 static int 721 ufs_chown(vp, uid, gid, cred, td) 722 struct vnode *vp; 723 uid_t uid; 724 gid_t gid; 725 struct ucred *cred; 726 struct thread *td; 727 { 728 struct inode *ip = VTOI(vp); 729 uid_t ouid; 730 gid_t ogid; 731 int error = 0; 732 #ifdef QUOTA 733 int i; 734 ufs2_daddr_t change; 735 #endif 736 737 if (uid == (uid_t)VNOVAL) 738 uid = ip->i_uid; 739 if (gid == (gid_t)VNOVAL) 740 gid = ip->i_gid; 741 /* 742 * To modify the ownership of a file, must possess VADMIN for that 743 * file. 744 */ 745 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 746 return (error); 747 /* 748 * To change the owner of a file, or change the group of a file to a 749 * group of which we are not a member, the caller must have 750 * privilege. 751 */ 752 if ((uid != ip->i_uid || 753 (gid != ip->i_gid && !groupmember(gid, cred))) && 754 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 755 return (error); 756 ogid = ip->i_gid; 757 ouid = ip->i_uid; 758 #ifdef QUOTA 759 if ((error = getinoquota(ip)) != 0) 760 return (error); 761 if (ouid == uid) { 762 dqrele(vp, ip->i_dquot[USRQUOTA]); 763 ip->i_dquot[USRQUOTA] = NODQUOT; 764 } 765 if (ogid == gid) { 766 dqrele(vp, ip->i_dquot[GRPQUOTA]); 767 ip->i_dquot[GRPQUOTA] = NODQUOT; 768 } 769 change = DIP(ip, i_blocks); 770 (void) chkdq(ip, -change, cred, CHOWN); 771 (void) chkiq(ip, -1, cred, CHOWN); 772 for (i = 0; i < MAXQUOTAS; i++) { 773 dqrele(vp, ip->i_dquot[i]); 774 ip->i_dquot[i] = NODQUOT; 775 } 776 #endif 777 ip->i_gid = gid; 778 DIP_SET(ip, i_gid, gid); 779 ip->i_uid = uid; 780 DIP_SET(ip, i_uid, uid); 781 #ifdef QUOTA 782 if ((error = getinoquota(ip)) == 0) { 783 if (ouid == uid) { 784 dqrele(vp, ip->i_dquot[USRQUOTA]); 785 ip->i_dquot[USRQUOTA] = NODQUOT; 786 } 787 if (ogid == gid) { 788 dqrele(vp, ip->i_dquot[GRPQUOTA]); 789 ip->i_dquot[GRPQUOTA] = NODQUOT; 790 } 791 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 792 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 793 goto good; 794 else 795 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 796 } 797 for (i = 0; i < MAXQUOTAS; i++) { 798 dqrele(vp, ip->i_dquot[i]); 799 ip->i_dquot[i] = NODQUOT; 800 } 801 } 802 ip->i_gid = ogid; 803 DIP_SET(ip, i_gid, ogid); 804 ip->i_uid = ouid; 805 DIP_SET(ip, i_uid, ouid); 806 if (getinoquota(ip) == 0) { 807 if (ouid == uid) { 808 dqrele(vp, ip->i_dquot[USRQUOTA]); 809 ip->i_dquot[USRQUOTA] = NODQUOT; 810 } 811 if (ogid == gid) { 812 dqrele(vp, ip->i_dquot[GRPQUOTA]); 813 ip->i_dquot[GRPQUOTA] = NODQUOT; 814 } 815 (void) chkdq(ip, change, cred, FORCE|CHOWN); 816 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 817 (void) getinoquota(ip); 818 } 819 return (error); 820 good: 821 if (getinoquota(ip)) 822 panic("ufs_chown: lost quota"); 823 #endif /* QUOTA */ 824 ip->i_flag |= IN_CHANGE; 825 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 826 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) { 827 ip->i_mode &= ~(ISUID | ISGID); 828 DIP_SET(ip, i_mode, ip->i_mode); 829 } 830 } 831 return (0); 832 } 833 834 static int 835 ufs_remove(ap) 836 struct vop_remove_args /* { 837 struct vnode *a_dvp; 838 struct vnode *a_vp; 839 struct componentname *a_cnp; 840 } */ *ap; 841 { 842 struct inode *ip; 843 struct vnode *vp = ap->a_vp; 844 struct vnode *dvp = ap->a_dvp; 845 int error; 846 struct thread *td; 847 848 td = curthread; 849 ip = VTOI(vp); 850 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 851 (VTOI(dvp)->i_flags & APPEND)) { 852 error = EPERM; 853 goto out; 854 } 855 #ifdef UFS_GJOURNAL 856 ufs_gjournal_orphan(vp); 857 #endif 858 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 859 if (ip->i_nlink <= 0) 860 vp->v_vflag |= VV_NOSYNC; 861 if ((ip->i_flags & SF_SNAPSHOT) != 0) { 862 /* 863 * Avoid deadlock where another thread is trying to 864 * update the inodeblock for dvp and is waiting on 865 * snaplk. Temporary unlock the vnode lock for the 866 * unlinked file and sync the directory. This should 867 * allow vput() of the directory to not block later on 868 * while holding the snapshot vnode locked, assuming 869 * that the directory hasn't been unlinked too. 870 */ 871 VOP_UNLOCK(vp, 0); 872 (void) VOP_FSYNC(dvp, MNT_WAIT, td); 873 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 874 } 875 out: 876 return (error); 877 } 878 879 /* 880 * link vnode call 881 */ 882 static int 883 ufs_link(ap) 884 struct vop_link_args /* { 885 struct vnode *a_tdvp; 886 struct vnode *a_vp; 887 struct componentname *a_cnp; 888 } */ *ap; 889 { 890 struct vnode *vp = ap->a_vp; 891 struct vnode *tdvp = ap->a_tdvp; 892 struct componentname *cnp = ap->a_cnp; 893 struct inode *ip; 894 struct direct newdir; 895 int error; 896 897 #ifdef INVARIANTS 898 if ((cnp->cn_flags & HASBUF) == 0) 899 panic("ufs_link: no name"); 900 #endif 901 if (tdvp->v_mount != vp->v_mount) { 902 error = EXDEV; 903 goto out; 904 } 905 ip = VTOI(vp); 906 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 907 error = EMLINK; 908 goto out; 909 } 910 if (ip->i_flags & (IMMUTABLE | APPEND)) { 911 error = EPERM; 912 goto out; 913 } 914 ip->i_effnlink++; 915 ip->i_nlink++; 916 DIP_SET(ip, i_nlink, ip->i_nlink); 917 ip->i_flag |= IN_CHANGE; 918 if (DOINGSOFTDEP(vp)) 919 softdep_change_linkcnt(ip); 920 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 921 if (!error) { 922 ufs_makedirentry(ip, cnp, &newdir); 923 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 924 } 925 926 if (error) { 927 ip->i_effnlink--; 928 ip->i_nlink--; 929 DIP_SET(ip, i_nlink, ip->i_nlink); 930 ip->i_flag |= IN_CHANGE; 931 if (DOINGSOFTDEP(vp)) 932 softdep_change_linkcnt(ip); 933 } 934 out: 935 return (error); 936 } 937 938 /* 939 * whiteout vnode call 940 */ 941 static int 942 ufs_whiteout(ap) 943 struct vop_whiteout_args /* { 944 struct vnode *a_dvp; 945 struct componentname *a_cnp; 946 int a_flags; 947 } */ *ap; 948 { 949 struct vnode *dvp = ap->a_dvp; 950 struct componentname *cnp = ap->a_cnp; 951 struct direct newdir; 952 int error = 0; 953 954 switch (ap->a_flags) { 955 case LOOKUP: 956 /* 4.4 format directories support whiteout operations */ 957 if (dvp->v_mount->mnt_maxsymlinklen > 0) 958 return (0); 959 return (EOPNOTSUPP); 960 961 case CREATE: 962 /* create a new directory whiteout */ 963 #ifdef INVARIANTS 964 if ((cnp->cn_flags & SAVENAME) == 0) 965 panic("ufs_whiteout: missing name"); 966 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 967 panic("ufs_whiteout: old format filesystem"); 968 #endif 969 970 newdir.d_ino = WINO; 971 newdir.d_namlen = cnp->cn_namelen; 972 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 973 newdir.d_type = DT_WHT; 974 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 975 break; 976 977 case DELETE: 978 /* remove an existing directory whiteout */ 979 #ifdef INVARIANTS 980 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 981 panic("ufs_whiteout: old format filesystem"); 982 #endif 983 984 cnp->cn_flags &= ~DOWHITEOUT; 985 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 986 break; 987 default: 988 panic("ufs_whiteout: unknown op"); 989 } 990 return (error); 991 } 992 993 /* 994 * Rename system call. 995 * rename("foo", "bar"); 996 * is essentially 997 * unlink("bar"); 998 * link("foo", "bar"); 999 * unlink("foo"); 1000 * but ``atomically''. Can't do full commit without saving state in the 1001 * inode on disk which isn't feasible at this time. Best we can do is 1002 * always guarantee the target exists. 1003 * 1004 * Basic algorithm is: 1005 * 1006 * 1) Bump link count on source while we're linking it to the 1007 * target. This also ensure the inode won't be deleted out 1008 * from underneath us while we work (it may be truncated by 1009 * a concurrent `trunc' or `open' for creation). 1010 * 2) Link source to destination. If destination already exists, 1011 * delete it first. 1012 * 3) Unlink source reference to inode if still around. If a 1013 * directory was moved and the parent of the destination 1014 * is different from the source, patch the ".." entry in the 1015 * directory. 1016 */ 1017 static int 1018 ufs_rename(ap) 1019 struct vop_rename_args /* { 1020 struct vnode *a_fdvp; 1021 struct vnode *a_fvp; 1022 struct componentname *a_fcnp; 1023 struct vnode *a_tdvp; 1024 struct vnode *a_tvp; 1025 struct componentname *a_tcnp; 1026 } */ *ap; 1027 { 1028 struct vnode *tvp = ap->a_tvp; 1029 struct vnode *tdvp = ap->a_tdvp; 1030 struct vnode *fvp = ap->a_fvp; 1031 struct vnode *fdvp = ap->a_fdvp; 1032 struct componentname *tcnp = ap->a_tcnp; 1033 struct componentname *fcnp = ap->a_fcnp; 1034 struct thread *td = fcnp->cn_thread; 1035 struct inode *ip, *xp, *dp; 1036 struct direct newdir; 1037 int doingdirectory = 0, oldparent = 0, newparent = 0; 1038 int error = 0, ioflag; 1039 ino_t fvp_ino; 1040 1041 #ifdef INVARIANTS 1042 if ((tcnp->cn_flags & HASBUF) == 0 || 1043 (fcnp->cn_flags & HASBUF) == 0) 1044 panic("ufs_rename: no name"); 1045 #endif 1046 /* 1047 * Check for cross-device rename. 1048 */ 1049 if ((fvp->v_mount != tdvp->v_mount) || 1050 (tvp && (fvp->v_mount != tvp->v_mount))) { 1051 error = EXDEV; 1052 abortit: 1053 if (tdvp == tvp) 1054 vrele(tdvp); 1055 else 1056 vput(tdvp); 1057 if (tvp) 1058 vput(tvp); 1059 vrele(fdvp); 1060 vrele(fvp); 1061 return (error); 1062 } 1063 1064 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1065 (VTOI(tdvp)->i_flags & APPEND))) { 1066 error = EPERM; 1067 goto abortit; 1068 } 1069 1070 /* 1071 * Renaming a file to itself has no effect. The upper layers should 1072 * not call us in that case. Temporarily just warn if they do. 1073 */ 1074 if (fvp == tvp) { 1075 printf("ufs_rename: fvp == tvp (can't happen)\n"); 1076 error = 0; 1077 goto abortit; 1078 } 1079 1080 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 1081 goto abortit; 1082 dp = VTOI(fdvp); 1083 ip = VTOI(fvp); 1084 if (ip->i_nlink >= LINK_MAX) { 1085 VOP_UNLOCK(fvp, 0); 1086 error = EMLINK; 1087 goto abortit; 1088 } 1089 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1090 || (dp->i_flags & APPEND)) { 1091 VOP_UNLOCK(fvp, 0); 1092 error = EPERM; 1093 goto abortit; 1094 } 1095 if ((ip->i_mode & IFMT) == IFDIR) { 1096 /* 1097 * Avoid ".", "..", and aliases of "." for obvious reasons. 1098 */ 1099 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1100 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 1101 (ip->i_flag & IN_RENAME)) { 1102 VOP_UNLOCK(fvp, 0); 1103 error = EINVAL; 1104 goto abortit; 1105 } 1106 ip->i_flag |= IN_RENAME; 1107 oldparent = dp->i_number; 1108 doingdirectory = 1; 1109 } 1110 vrele(fdvp); 1111 1112 /* 1113 * When the target exists, both the directory 1114 * and target vnodes are returned locked. 1115 */ 1116 dp = VTOI(tdvp); 1117 xp = NULL; 1118 if (tvp) 1119 xp = VTOI(tvp); 1120 1121 /* 1122 * 1) Bump link count while we're moving stuff 1123 * around. If we crash somewhere before 1124 * completing our work, the link count 1125 * may be wrong, but correctable. 1126 */ 1127 ip->i_effnlink++; 1128 ip->i_nlink++; 1129 DIP_SET(ip, i_nlink, ip->i_nlink); 1130 ip->i_flag |= IN_CHANGE; 1131 if (DOINGSOFTDEP(fvp)) 1132 softdep_change_linkcnt(ip); 1133 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 1134 DOINGASYNC(fvp)))) != 0) { 1135 VOP_UNLOCK(fvp, 0); 1136 goto bad; 1137 } 1138 1139 /* 1140 * If ".." must be changed (ie the directory gets a new 1141 * parent) then the source directory must not be in the 1142 * directory hierarchy above the target, as this would 1143 * orphan everything below the source directory. Also 1144 * the user must have write permission in the source so 1145 * as to be able to change "..". We must repeat the call 1146 * to namei, as the parent directory is unlocked by the 1147 * call to checkpath(). 1148 */ 1149 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1150 fvp_ino = ip->i_number; 1151 VOP_UNLOCK(fvp, 0); 1152 if (oldparent != dp->i_number) 1153 newparent = dp->i_number; 1154 if (doingdirectory && newparent) { 1155 if (error) /* write access check above */ 1156 goto bad; 1157 if (xp != NULL) 1158 vput(tvp); 1159 error = ufs_checkpath(fvp_ino, dp, tcnp->cn_cred); 1160 if (error) 1161 goto out; 1162 if ((tcnp->cn_flags & SAVESTART) == 0) 1163 panic("ufs_rename: lost to startdir"); 1164 VREF(tdvp); 1165 error = relookup(tdvp, &tvp, tcnp); 1166 if (error) 1167 goto out; 1168 vrele(tdvp); 1169 dp = VTOI(tdvp); 1170 xp = NULL; 1171 if (tvp) 1172 xp = VTOI(tvp); 1173 } 1174 /* 1175 * 2) If target doesn't exist, link the target 1176 * to the source and unlink the source. 1177 * Otherwise, rewrite the target directory 1178 * entry to reference the source inode and 1179 * expunge the original entry's existence. 1180 */ 1181 if (xp == NULL) { 1182 if (dp->i_dev != ip->i_dev) 1183 panic("ufs_rename: EXDEV"); 1184 /* 1185 * Account for ".." in new directory. 1186 * When source and destination have the same 1187 * parent we don't fool with the link count. 1188 */ 1189 if (doingdirectory && newparent) { 1190 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1191 error = EMLINK; 1192 goto bad; 1193 } 1194 dp->i_effnlink++; 1195 dp->i_nlink++; 1196 DIP_SET(dp, i_nlink, dp->i_nlink); 1197 dp->i_flag |= IN_CHANGE; 1198 if (DOINGSOFTDEP(tdvp)) 1199 softdep_change_linkcnt(dp); 1200 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1201 DOINGASYNC(tdvp))); 1202 if (error) 1203 goto bad; 1204 } 1205 ufs_makedirentry(ip, tcnp, &newdir); 1206 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1207 if (error) { 1208 if (doingdirectory && newparent) { 1209 dp->i_effnlink--; 1210 dp->i_nlink--; 1211 DIP_SET(dp, i_nlink, dp->i_nlink); 1212 dp->i_flag |= IN_CHANGE; 1213 if (DOINGSOFTDEP(tdvp)) 1214 softdep_change_linkcnt(dp); 1215 (void)UFS_UPDATE(tdvp, 1); 1216 } 1217 goto bad; 1218 } 1219 vput(tdvp); 1220 } else { 1221 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1222 panic("ufs_rename: EXDEV"); 1223 /* 1224 * Short circuit rename(foo, foo). 1225 */ 1226 if (xp->i_number == ip->i_number) 1227 panic("ufs_rename: same file"); 1228 /* 1229 * If the parent directory is "sticky", then the caller 1230 * must possess VADMIN for the parent directory, or the 1231 * destination of the rename. This implements append-only 1232 * directories. 1233 */ 1234 if ((dp->i_mode & S_ISTXT) && 1235 VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) && 1236 VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) { 1237 error = EPERM; 1238 goto bad; 1239 } 1240 /* 1241 * Target must be empty if a directory and have no links 1242 * to it. Also, ensure source and target are compatible 1243 * (both directories, or both not directories). 1244 */ 1245 if ((xp->i_mode&IFMT) == IFDIR) { 1246 if ((xp->i_effnlink > 2) || 1247 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1248 error = ENOTEMPTY; 1249 goto bad; 1250 } 1251 if (!doingdirectory) { 1252 error = ENOTDIR; 1253 goto bad; 1254 } 1255 cache_purge(tdvp); 1256 } else if (doingdirectory) { 1257 error = EISDIR; 1258 goto bad; 1259 } 1260 error = ufs_dirrewrite(dp, xp, ip->i_number, 1261 IFTODT(ip->i_mode), 1262 (doingdirectory && newparent) ? newparent : doingdirectory); 1263 if (error) 1264 goto bad; 1265 if (doingdirectory) { 1266 if (!newparent) { 1267 dp->i_effnlink--; 1268 if (DOINGSOFTDEP(tdvp)) 1269 softdep_change_linkcnt(dp); 1270 } 1271 xp->i_effnlink--; 1272 if (DOINGSOFTDEP(tvp)) 1273 softdep_change_linkcnt(xp); 1274 } 1275 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1276 /* 1277 * Truncate inode. The only stuff left in the directory 1278 * is "." and "..". The "." reference is inconsequential 1279 * since we are quashing it. We have removed the "." 1280 * reference and the reference in the parent directory, 1281 * but there may be other hard links. The soft 1282 * dependency code will arrange to do these operations 1283 * after the parent directory entry has been deleted on 1284 * disk, so when running with that code we avoid doing 1285 * them now. 1286 */ 1287 if (!newparent) { 1288 dp->i_nlink--; 1289 DIP_SET(dp, i_nlink, dp->i_nlink); 1290 dp->i_flag |= IN_CHANGE; 1291 } 1292 xp->i_nlink--; 1293 DIP_SET(xp, i_nlink, xp->i_nlink); 1294 xp->i_flag |= IN_CHANGE; 1295 ioflag = IO_NORMAL; 1296 if (!DOINGASYNC(tvp)) 1297 ioflag |= IO_SYNC; 1298 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1299 tcnp->cn_cred, tcnp->cn_thread)) != 0) 1300 goto bad; 1301 } 1302 vput(tdvp); 1303 vput(tvp); 1304 xp = NULL; 1305 } 1306 1307 /* 1308 * 3) Unlink the source. 1309 */ 1310 fcnp->cn_flags &= ~MODMASK; 1311 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1312 if ((fcnp->cn_flags & SAVESTART) == 0) 1313 panic("ufs_rename: lost from startdir"); 1314 VREF(fdvp); 1315 error = relookup(fdvp, &fvp, fcnp); 1316 if (error == 0) 1317 vrele(fdvp); 1318 if (fvp != NULL) { 1319 xp = VTOI(fvp); 1320 dp = VTOI(fdvp); 1321 } else { 1322 /* 1323 * From name has disappeared. IN_RENAME is not sufficient 1324 * to protect against directory races due to timing windows, 1325 * so we have to remove the panic. XXX the only real way 1326 * to solve this issue is at a much higher level. By the 1327 * time we hit ufs_rename() it's too late. 1328 */ 1329 #if 0 1330 if (doingdirectory) 1331 panic("ufs_rename: lost dir entry"); 1332 #endif 1333 vrele(ap->a_fvp); 1334 return (0); 1335 } 1336 /* 1337 * Ensure that the directory entry still exists and has not 1338 * changed while the new name has been entered. If the source is 1339 * a file then the entry may have been unlinked or renamed. In 1340 * either case there is no further work to be done. If the source 1341 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1342 * flag ensures that it cannot be moved by another rename or removed 1343 * by a rmdir. 1344 */ 1345 if (xp != ip) { 1346 /* 1347 * From name resolves to a different inode. IN_RENAME is 1348 * not sufficient protection against timing window races 1349 * so we can't panic here. XXX the only real way 1350 * to solve this issue is at a much higher level. By the 1351 * time we hit ufs_rename() it's too late. 1352 */ 1353 #if 0 1354 if (doingdirectory) 1355 panic("ufs_rename: lost dir entry"); 1356 #endif 1357 } else { 1358 /* 1359 * If the source is a directory with a 1360 * new parent, the link count of the old 1361 * parent directory must be decremented 1362 * and ".." set to point to the new parent. 1363 */ 1364 if (doingdirectory && newparent) { 1365 xp->i_offset = mastertemplate.dot_reclen; 1366 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1367 cache_purge(fdvp); 1368 } 1369 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1370 xp->i_flag &= ~IN_RENAME; 1371 } 1372 if (dp) 1373 vput(fdvp); 1374 if (xp) 1375 vput(fvp); 1376 vrele(ap->a_fvp); 1377 return (error); 1378 1379 bad: 1380 if (xp) 1381 vput(ITOV(xp)); 1382 vput(ITOV(dp)); 1383 out: 1384 if (doingdirectory) 1385 ip->i_flag &= ~IN_RENAME; 1386 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1387 ip->i_effnlink--; 1388 ip->i_nlink--; 1389 DIP_SET(ip, i_nlink, ip->i_nlink); 1390 ip->i_flag |= IN_CHANGE; 1391 ip->i_flag &= ~IN_RENAME; 1392 if (DOINGSOFTDEP(fvp)) 1393 softdep_change_linkcnt(ip); 1394 vput(fvp); 1395 } else 1396 vrele(fvp); 1397 return (error); 1398 } 1399 1400 /* 1401 * Mkdir system call 1402 */ 1403 static int 1404 ufs_mkdir(ap) 1405 struct vop_mkdir_args /* { 1406 struct vnode *a_dvp; 1407 struct vnode **a_vpp; 1408 struct componentname *a_cnp; 1409 struct vattr *a_vap; 1410 } */ *ap; 1411 { 1412 struct vnode *dvp = ap->a_dvp; 1413 struct vattr *vap = ap->a_vap; 1414 struct componentname *cnp = ap->a_cnp; 1415 struct inode *ip, *dp; 1416 struct vnode *tvp; 1417 struct buf *bp; 1418 struct dirtemplate dirtemplate, *dtp; 1419 struct direct newdir; 1420 #ifdef UFS_ACL 1421 struct acl *acl, *dacl; 1422 #endif 1423 int error, dmode; 1424 long blkoff; 1425 1426 #ifdef INVARIANTS 1427 if ((cnp->cn_flags & HASBUF) == 0) 1428 panic("ufs_mkdir: no name"); 1429 #endif 1430 dp = VTOI(dvp); 1431 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1432 error = EMLINK; 1433 goto out; 1434 } 1435 dmode = vap->va_mode & 0777; 1436 dmode |= IFDIR; 1437 /* 1438 * Must simulate part of ufs_makeinode here to acquire the inode, 1439 * but not have it entered in the parent directory. The entry is 1440 * made later after writing "." and ".." entries. 1441 */ 1442 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1443 if (error) 1444 goto out; 1445 ip = VTOI(tvp); 1446 ip->i_gid = dp->i_gid; 1447 DIP_SET(ip, i_gid, dp->i_gid); 1448 #ifdef SUIDDIR 1449 { 1450 #ifdef QUOTA 1451 struct ucred ucred, *ucp; 1452 gid_t ucred_group; 1453 ucp = cnp->cn_cred; 1454 #endif 1455 /* 1456 * If we are hacking owners here, (only do this where told to) 1457 * and we are not giving it TO root, (would subvert quotas) 1458 * then go ahead and give it to the other user. 1459 * The new directory also inherits the SUID bit. 1460 * If user's UID and dir UID are the same, 1461 * 'give it away' so that the SUID is still forced on. 1462 */ 1463 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1464 (dp->i_mode & ISUID) && dp->i_uid) { 1465 dmode |= ISUID; 1466 ip->i_uid = dp->i_uid; 1467 DIP_SET(ip, i_uid, dp->i_uid); 1468 #ifdef QUOTA 1469 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1470 /* 1471 * Make sure the correct user gets charged 1472 * for the space. 1473 * Make a dummy credential for the victim. 1474 * XXX This seems to never be accessed out of 1475 * our context so a stack variable is ok. 1476 */ 1477 refcount_init(&ucred.cr_ref, 1); 1478 ucred.cr_uid = ip->i_uid; 1479 ucred.cr_ngroups = 1; 1480 ucred.cr_groups = &ucred_group; 1481 ucred.cr_groups[0] = dp->i_gid; 1482 ucp = &ucred; 1483 } 1484 #endif 1485 } else { 1486 ip->i_uid = cnp->cn_cred->cr_uid; 1487 DIP_SET(ip, i_uid, ip->i_uid); 1488 } 1489 #ifdef QUOTA 1490 if ((error = getinoquota(ip)) || 1491 (error = chkiq(ip, 1, ucp, 0))) { 1492 UFS_VFREE(tvp, ip->i_number, dmode); 1493 vput(tvp); 1494 return (error); 1495 } 1496 #endif 1497 } 1498 #else /* !SUIDDIR */ 1499 ip->i_uid = cnp->cn_cred->cr_uid; 1500 DIP_SET(ip, i_uid, ip->i_uid); 1501 #ifdef QUOTA 1502 if ((error = getinoquota(ip)) || 1503 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1504 UFS_VFREE(tvp, ip->i_number, dmode); 1505 vput(tvp); 1506 return (error); 1507 } 1508 #endif 1509 #endif /* !SUIDDIR */ 1510 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1511 #ifdef UFS_ACL 1512 acl = dacl = NULL; 1513 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 1514 acl = acl_alloc(M_WAITOK); 1515 dacl = acl_alloc(M_WAITOK); 1516 1517 /* 1518 * Retrieve default ACL from parent, if any. 1519 */ 1520 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 1521 cnp->cn_thread); 1522 switch (error) { 1523 case 0: 1524 /* 1525 * Retrieved a default ACL, so merge mode and ACL if 1526 * necessary. If the ACL is empty, fall through to 1527 * the "not defined or available" case. 1528 */ 1529 if (acl->acl_cnt != 0) { 1530 dmode = acl_posix1e_newfilemode(dmode, acl); 1531 ip->i_mode = dmode; 1532 DIP_SET(ip, i_mode, dmode); 1533 *dacl = *acl; 1534 ufs_sync_acl_from_inode(ip, acl); 1535 break; 1536 } 1537 /* FALLTHROUGH */ 1538 1539 case EOPNOTSUPP: 1540 /* 1541 * Just use the mode as-is. 1542 */ 1543 ip->i_mode = dmode; 1544 DIP_SET(ip, i_mode, dmode); 1545 acl_free(acl); 1546 acl_free(dacl); 1547 dacl = acl = NULL; 1548 break; 1549 1550 default: 1551 UFS_VFREE(tvp, ip->i_number, dmode); 1552 vput(tvp); 1553 acl_free(acl); 1554 acl_free(dacl); 1555 return (error); 1556 } 1557 } else { 1558 #endif /* !UFS_ACL */ 1559 ip->i_mode = dmode; 1560 DIP_SET(ip, i_mode, dmode); 1561 #ifdef UFS_ACL 1562 } 1563 #endif 1564 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1565 ip->i_effnlink = 2; 1566 ip->i_nlink = 2; 1567 DIP_SET(ip, i_nlink, 2); 1568 if (DOINGSOFTDEP(tvp)) 1569 softdep_change_linkcnt(ip); 1570 if (cnp->cn_flags & ISWHITEOUT) { 1571 ip->i_flags |= UF_OPAQUE; 1572 DIP_SET(ip, i_flags, ip->i_flags); 1573 } 1574 1575 /* 1576 * Bump link count in parent directory to reflect work done below. 1577 * Should be done before reference is created so cleanup is 1578 * possible if we crash. 1579 */ 1580 dp->i_effnlink++; 1581 dp->i_nlink++; 1582 DIP_SET(dp, i_nlink, dp->i_nlink); 1583 dp->i_flag |= IN_CHANGE; 1584 if (DOINGSOFTDEP(dvp)) 1585 softdep_change_linkcnt(dp); 1586 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1587 if (error) 1588 goto bad; 1589 #ifdef MAC 1590 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 1591 error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount, 1592 dvp, tvp, cnp); 1593 if (error) 1594 goto bad; 1595 } 1596 #endif 1597 #ifdef UFS_ACL 1598 if (acl != NULL) { 1599 /* 1600 * XXX: If we abort now, will Soft Updates notify the extattr 1601 * code that the EAs for the file need to be released? 1602 */ 1603 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 1604 cnp->cn_thread); 1605 if (error == 0) 1606 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, 1607 cnp->cn_cred, cnp->cn_thread); 1608 switch (error) { 1609 case 0: 1610 break; 1611 1612 case EOPNOTSUPP: 1613 /* 1614 * XXX: This should not happen, as EOPNOTSUPP above 1615 * was supposed to free acl. 1616 */ 1617 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1618 /* 1619 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()"); 1620 */ 1621 break; 1622 1623 default: 1624 acl_free(acl); 1625 acl_free(dacl); 1626 dacl = acl = NULL; 1627 goto bad; 1628 } 1629 acl_free(acl); 1630 acl_free(dacl); 1631 dacl = acl = NULL; 1632 } 1633 #endif /* !UFS_ACL */ 1634 1635 /* 1636 * Initialize directory with "." and ".." from static template. 1637 */ 1638 if (dvp->v_mount->mnt_maxsymlinklen > 0) 1639 dtp = &mastertemplate; 1640 else 1641 dtp = (struct dirtemplate *)&omastertemplate; 1642 dirtemplate = *dtp; 1643 dirtemplate.dot_ino = ip->i_number; 1644 dirtemplate.dotdot_ino = dp->i_number; 1645 if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1646 BA_CLRBUF, &bp)) != 0) 1647 goto bad; 1648 ip->i_size = DIRBLKSIZ; 1649 DIP_SET(ip, i_size, DIRBLKSIZ); 1650 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1651 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1652 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1653 if (DOINGSOFTDEP(tvp)) { 1654 /* 1655 * Ensure that the entire newly allocated block is a 1656 * valid directory so that future growth within the 1657 * block does not have to ensure that the block is 1658 * written before the inode. 1659 */ 1660 blkoff = DIRBLKSIZ; 1661 while (blkoff < bp->b_bcount) { 1662 ((struct direct *) 1663 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1664 blkoff += DIRBLKSIZ; 1665 } 1666 } 1667 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1668 DOINGASYNC(tvp)))) != 0) { 1669 (void)bwrite(bp); 1670 goto bad; 1671 } 1672 /* 1673 * Directory set up, now install its entry in the parent directory. 1674 * 1675 * If we are not doing soft dependencies, then we must write out the 1676 * buffer containing the new directory body before entering the new 1677 * name in the parent. If we are doing soft dependencies, then the 1678 * buffer containing the new directory body will be passed to and 1679 * released in the soft dependency code after the code has attached 1680 * an appropriate ordering dependency to the buffer which ensures that 1681 * the buffer is written before the new name is written in the parent. 1682 */ 1683 if (DOINGASYNC(dvp)) 1684 bdwrite(bp); 1685 else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp)))) 1686 goto bad; 1687 ufs_makedirentry(ip, cnp, &newdir); 1688 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1689 1690 bad: 1691 if (error == 0) { 1692 *ap->a_vpp = tvp; 1693 } else { 1694 #ifdef UFS_ACL 1695 if (acl != NULL) 1696 acl_free(acl); 1697 if (dacl != NULL) 1698 acl_free(dacl); 1699 #endif 1700 dp->i_effnlink--; 1701 dp->i_nlink--; 1702 DIP_SET(dp, i_nlink, dp->i_nlink); 1703 dp->i_flag |= IN_CHANGE; 1704 if (DOINGSOFTDEP(dvp)) 1705 softdep_change_linkcnt(dp); 1706 /* 1707 * No need to do an explicit VOP_TRUNCATE here, vrele will 1708 * do this for us because we set the link count to 0. 1709 */ 1710 ip->i_effnlink = 0; 1711 ip->i_nlink = 0; 1712 DIP_SET(ip, i_nlink, 0); 1713 ip->i_flag |= IN_CHANGE; 1714 if (DOINGSOFTDEP(tvp)) 1715 softdep_change_linkcnt(ip); 1716 vput(tvp); 1717 } 1718 out: 1719 return (error); 1720 } 1721 1722 /* 1723 * Rmdir system call. 1724 */ 1725 static int 1726 ufs_rmdir(ap) 1727 struct vop_rmdir_args /* { 1728 struct vnode *a_dvp; 1729 struct vnode *a_vp; 1730 struct componentname *a_cnp; 1731 } */ *ap; 1732 { 1733 struct vnode *vp = ap->a_vp; 1734 struct vnode *dvp = ap->a_dvp; 1735 struct componentname *cnp = ap->a_cnp; 1736 struct inode *ip, *dp; 1737 int error, ioflag; 1738 1739 ip = VTOI(vp); 1740 dp = VTOI(dvp); 1741 1742 /* 1743 * Do not remove a directory that is in the process of being renamed. 1744 * Verify the directory is empty (and valid). Rmdir ".." will not be 1745 * valid since ".." will contain a reference to the current directory 1746 * and thus be non-empty. Do not allow the removal of mounted on 1747 * directories (this can happen when an NFS exported filesystem 1748 * tries to remove a locally mounted on directory). 1749 */ 1750 error = 0; 1751 if ((ip->i_flag & IN_RENAME) || ip->i_effnlink < 2) { 1752 error = EINVAL; 1753 goto out; 1754 } 1755 if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1756 error = ENOTEMPTY; 1757 goto out; 1758 } 1759 if ((dp->i_flags & APPEND) 1760 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1761 error = EPERM; 1762 goto out; 1763 } 1764 if (vp->v_mountedhere != 0) { 1765 error = EINVAL; 1766 goto out; 1767 } 1768 #ifdef UFS_GJOURNAL 1769 ufs_gjournal_orphan(vp); 1770 #endif 1771 /* 1772 * Delete reference to directory before purging 1773 * inode. If we crash in between, the directory 1774 * will be reattached to lost+found, 1775 */ 1776 dp->i_effnlink--; 1777 ip->i_effnlink--; 1778 if (DOINGSOFTDEP(vp)) { 1779 softdep_change_linkcnt(dp); 1780 softdep_change_linkcnt(ip); 1781 } 1782 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1783 if (error) { 1784 dp->i_effnlink++; 1785 ip->i_effnlink++; 1786 if (DOINGSOFTDEP(vp)) { 1787 softdep_change_linkcnt(dp); 1788 softdep_change_linkcnt(ip); 1789 } 1790 goto out; 1791 } 1792 cache_purge(dvp); 1793 /* 1794 * Truncate inode. The only stuff left in the directory is "." and 1795 * "..". The "." reference is inconsequential since we are quashing 1796 * it. The soft dependency code will arrange to do these operations 1797 * after the parent directory entry has been deleted on disk, so 1798 * when running with that code we avoid doing them now. 1799 */ 1800 if (!DOINGSOFTDEP(vp)) { 1801 dp->i_nlink--; 1802 DIP_SET(dp, i_nlink, dp->i_nlink); 1803 dp->i_flag |= IN_CHANGE; 1804 ip->i_nlink--; 1805 DIP_SET(ip, i_nlink, ip->i_nlink); 1806 ip->i_flag |= IN_CHANGE; 1807 ioflag = IO_NORMAL; 1808 if (!DOINGASYNC(vp)) 1809 ioflag |= IO_SYNC; 1810 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1811 cnp->cn_thread); 1812 } 1813 cache_purge(vp); 1814 #ifdef UFS_DIRHASH 1815 /* Kill any active hash; i_effnlink == 0, so it will not come back. */ 1816 if (ip->i_dirhash != NULL) 1817 ufsdirhash_free(ip); 1818 #endif 1819 out: 1820 return (error); 1821 } 1822 1823 /* 1824 * symlink -- make a symbolic link 1825 */ 1826 static int 1827 ufs_symlink(ap) 1828 struct vop_symlink_args /* { 1829 struct vnode *a_dvp; 1830 struct vnode **a_vpp; 1831 struct componentname *a_cnp; 1832 struct vattr *a_vap; 1833 char *a_target; 1834 } */ *ap; 1835 { 1836 struct vnode *vp, **vpp = ap->a_vpp; 1837 struct inode *ip; 1838 int len, error; 1839 1840 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1841 vpp, ap->a_cnp); 1842 if (error) 1843 return (error); 1844 vp = *vpp; 1845 len = strlen(ap->a_target); 1846 if (len < vp->v_mount->mnt_maxsymlinklen) { 1847 ip = VTOI(vp); 1848 bcopy(ap->a_target, SHORTLINK(ip), len); 1849 ip->i_size = len; 1850 DIP_SET(ip, i_size, len); 1851 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1852 } else 1853 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1854 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1855 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1856 if (error) 1857 vput(vp); 1858 return (error); 1859 } 1860 1861 /* 1862 * Vnode op for reading directories. 1863 * 1864 * The routine below assumes that the on-disk format of a directory 1865 * is the same as that defined by <sys/dirent.h>. If the on-disk 1866 * format changes, then it will be necessary to do a conversion 1867 * from the on-disk format that read returns to the format defined 1868 * by <sys/dirent.h>. 1869 */ 1870 int 1871 ufs_readdir(ap) 1872 struct vop_readdir_args /* { 1873 struct vnode *a_vp; 1874 struct uio *a_uio; 1875 struct ucred *a_cred; 1876 int *a_eofflag; 1877 int *a_ncookies; 1878 u_long **a_cookies; 1879 } */ *ap; 1880 { 1881 struct uio *uio = ap->a_uio; 1882 int error; 1883 size_t count, lost; 1884 off_t off; 1885 1886 if (ap->a_ncookies != NULL) 1887 /* 1888 * Ensure that the block is aligned. The caller can use 1889 * the cookies to determine where in the block to start. 1890 */ 1891 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1892 off = uio->uio_offset; 1893 count = uio->uio_resid; 1894 /* Make sure we don't return partial entries. */ 1895 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1896 return (EINVAL); 1897 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1898 lost = uio->uio_resid - count; 1899 uio->uio_resid = count; 1900 uio->uio_iov->iov_len = count; 1901 # if (BYTE_ORDER == LITTLE_ENDIAN) 1902 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1903 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1904 } else { 1905 struct dirent *dp, *edp; 1906 struct uio auio; 1907 struct iovec aiov; 1908 caddr_t dirbuf; 1909 int readcnt; 1910 u_char tmp; 1911 1912 auio = *uio; 1913 auio.uio_iov = &aiov; 1914 auio.uio_iovcnt = 1; 1915 auio.uio_segflg = UIO_SYSSPACE; 1916 aiov.iov_len = count; 1917 dirbuf = malloc(count, M_TEMP, M_WAITOK); 1918 aiov.iov_base = dirbuf; 1919 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1920 if (error == 0) { 1921 readcnt = count - auio.uio_resid; 1922 edp = (struct dirent *)&dirbuf[readcnt]; 1923 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1924 tmp = dp->d_namlen; 1925 dp->d_namlen = dp->d_type; 1926 dp->d_type = tmp; 1927 if (dp->d_reclen > 0) { 1928 dp = (struct dirent *) 1929 ((char *)dp + dp->d_reclen); 1930 } else { 1931 error = EIO; 1932 break; 1933 } 1934 } 1935 if (dp >= edp) 1936 error = uiomove(dirbuf, readcnt, uio); 1937 } 1938 free(dirbuf, M_TEMP); 1939 } 1940 # else 1941 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1942 # endif 1943 if (!error && ap->a_ncookies != NULL) { 1944 struct dirent* dpStart; 1945 struct dirent* dpEnd; 1946 struct dirent* dp; 1947 int ncookies; 1948 u_long *cookies; 1949 u_long *cookiep; 1950 1951 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1952 panic("ufs_readdir: unexpected uio from NFS server"); 1953 dpStart = (struct dirent *) 1954 ((char *)uio->uio_iov->iov_base - (uio->uio_offset - off)); 1955 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1956 for (dp = dpStart, ncookies = 0; 1957 dp < dpEnd; 1958 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1959 ncookies++; 1960 cookies = malloc(ncookies * sizeof(u_long), M_TEMP, 1961 M_WAITOK); 1962 for (dp = dpStart, cookiep = cookies; 1963 dp < dpEnd; 1964 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1965 off += dp->d_reclen; 1966 *cookiep++ = (u_long) off; 1967 } 1968 *ap->a_ncookies = ncookies; 1969 *ap->a_cookies = cookies; 1970 } 1971 uio->uio_resid += lost; 1972 if (ap->a_eofflag) 1973 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1974 return (error); 1975 } 1976 1977 /* 1978 * Return target name of a symbolic link 1979 */ 1980 static int 1981 ufs_readlink(ap) 1982 struct vop_readlink_args /* { 1983 struct vnode *a_vp; 1984 struct uio *a_uio; 1985 struct ucred *a_cred; 1986 } */ *ap; 1987 { 1988 struct vnode *vp = ap->a_vp; 1989 struct inode *ip = VTOI(vp); 1990 doff_t isize; 1991 1992 isize = ip->i_size; 1993 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1994 DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */ 1995 return (uiomove(SHORTLINK(ip), isize, ap->a_uio)); 1996 } 1997 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1998 } 1999 2000 /* 2001 * Calculate the logical to physical mapping if not done already, 2002 * then call the device strategy routine. 2003 * 2004 * In order to be able to swap to a file, the ufs_bmaparray() operation may not 2005 * deadlock on memory. See ufs_bmap() for details. 2006 */ 2007 static int 2008 ufs_strategy(ap) 2009 struct vop_strategy_args /* { 2010 struct vnode *a_vp; 2011 struct buf *a_bp; 2012 } */ *ap; 2013 { 2014 struct buf *bp = ap->a_bp; 2015 struct vnode *vp = ap->a_vp; 2016 struct bufobj *bo; 2017 struct inode *ip; 2018 ufs2_daddr_t blkno; 2019 int error; 2020 2021 ip = VTOI(vp); 2022 if (bp->b_blkno == bp->b_lblkno) { 2023 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL); 2024 bp->b_blkno = blkno; 2025 if (error) { 2026 bp->b_error = error; 2027 bp->b_ioflags |= BIO_ERROR; 2028 bufdone(bp); 2029 return (0); 2030 } 2031 if ((long)bp->b_blkno == -1) 2032 vfs_bio_clrbuf(bp); 2033 } 2034 if ((long)bp->b_blkno == -1) { 2035 bufdone(bp); 2036 return (0); 2037 } 2038 bp->b_iooffset = dbtob(bp->b_blkno); 2039 bo = ip->i_umbufobj; 2040 BO_STRATEGY(bo, bp); 2041 return (0); 2042 } 2043 2044 /* 2045 * Print out the contents of an inode. 2046 */ 2047 static int 2048 ufs_print(ap) 2049 struct vop_print_args /* { 2050 struct vnode *a_vp; 2051 } */ *ap; 2052 { 2053 struct vnode *vp = ap->a_vp; 2054 struct inode *ip = VTOI(vp); 2055 2056 printf("\tino %lu, on dev %s", (u_long)ip->i_number, 2057 devtoname(ip->i_dev)); 2058 if (vp->v_type == VFIFO) 2059 fifo_printinfo(vp); 2060 printf("\n"); 2061 return (0); 2062 } 2063 2064 /* 2065 * Close wrapper for fifos. 2066 * 2067 * Update the times on the inode then do device close. 2068 */ 2069 static int 2070 ufsfifo_close(ap) 2071 struct vop_close_args /* { 2072 struct vnode *a_vp; 2073 int a_fflag; 2074 struct ucred *a_cred; 2075 struct thread *a_td; 2076 } */ *ap; 2077 { 2078 struct vnode *vp = ap->a_vp; 2079 int usecount; 2080 2081 VI_LOCK(vp); 2082 usecount = vp->v_usecount; 2083 if (usecount > 1) 2084 ufs_itimes_locked(vp); 2085 VI_UNLOCK(vp); 2086 return (fifo_specops.vop_close(ap)); 2087 } 2088 2089 /* 2090 * Kqfilter wrapper for fifos. 2091 * 2092 * Fall through to ufs kqfilter routines if needed 2093 */ 2094 static int 2095 ufsfifo_kqfilter(ap) 2096 struct vop_kqfilter_args *ap; 2097 { 2098 int error; 2099 2100 error = fifo_specops.vop_kqfilter(ap); 2101 if (error) 2102 error = vfs_kqfilter(ap); 2103 return (error); 2104 } 2105 2106 /* 2107 * Return POSIX pathconf information applicable to fifos. 2108 */ 2109 static int 2110 ufsfifo_pathconf(ap) 2111 struct vop_pathconf_args /* { 2112 struct vnode *a_vp; 2113 int a_name; 2114 int *a_retval; 2115 } */ *ap; 2116 { 2117 2118 switch (ap->a_name) { 2119 case _PC_ACL_EXTENDED: 2120 case _PC_ACL_PATH_MAX: 2121 case _PC_MAC_PRESENT: 2122 return (ufs_pathconf(ap)); 2123 default: 2124 return (fifo_specops.vop_pathconf(ap)); 2125 } 2126 /* NOTREACHED */ 2127 } 2128 2129 /* 2130 * Return POSIX pathconf information applicable to ufs filesystems. 2131 */ 2132 static int 2133 ufs_pathconf(ap) 2134 struct vop_pathconf_args /* { 2135 struct vnode *a_vp; 2136 int a_name; 2137 int *a_retval; 2138 } */ *ap; 2139 { 2140 int error; 2141 2142 error = 0; 2143 switch (ap->a_name) { 2144 case _PC_LINK_MAX: 2145 *ap->a_retval = LINK_MAX; 2146 break; 2147 case _PC_NAME_MAX: 2148 *ap->a_retval = NAME_MAX; 2149 break; 2150 case _PC_PATH_MAX: 2151 *ap->a_retval = PATH_MAX; 2152 break; 2153 case _PC_PIPE_BUF: 2154 *ap->a_retval = PIPE_BUF; 2155 break; 2156 case _PC_CHOWN_RESTRICTED: 2157 *ap->a_retval = 1; 2158 break; 2159 case _PC_NO_TRUNC: 2160 *ap->a_retval = 1; 2161 break; 2162 case _PC_ACL_EXTENDED: 2163 #ifdef UFS_ACL 2164 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2165 *ap->a_retval = 1; 2166 else 2167 *ap->a_retval = 0; 2168 #else 2169 *ap->a_retval = 0; 2170 #endif 2171 break; 2172 case _PC_ACL_PATH_MAX: 2173 #ifdef UFS_ACL 2174 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2175 *ap->a_retval = ACL_MAX_ENTRIES; 2176 else 2177 *ap->a_retval = 3; 2178 #else 2179 *ap->a_retval = 3; 2180 #endif 2181 break; 2182 case _PC_MAC_PRESENT: 2183 #ifdef MAC 2184 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL) 2185 *ap->a_retval = 1; 2186 else 2187 *ap->a_retval = 0; 2188 #else 2189 *ap->a_retval = 0; 2190 #endif 2191 break; 2192 case _PC_ASYNC_IO: 2193 /* _PC_ASYNC_IO should have been handled by upper layers. */ 2194 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 2195 error = EINVAL; 2196 break; 2197 case _PC_PRIO_IO: 2198 *ap->a_retval = 0; 2199 break; 2200 case _PC_SYNC_IO: 2201 *ap->a_retval = 0; 2202 break; 2203 case _PC_ALLOC_SIZE_MIN: 2204 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 2205 break; 2206 case _PC_FILESIZEBITS: 2207 *ap->a_retval = 64; 2208 break; 2209 case _PC_REC_INCR_XFER_SIZE: 2210 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2211 break; 2212 case _PC_REC_MAX_XFER_SIZE: 2213 *ap->a_retval = -1; /* means ``unlimited'' */ 2214 break; 2215 case _PC_REC_MIN_XFER_SIZE: 2216 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2217 break; 2218 case _PC_REC_XFER_ALIGN: 2219 *ap->a_retval = PAGE_SIZE; 2220 break; 2221 case _PC_SYMLINK_MAX: 2222 *ap->a_retval = MAXPATHLEN; 2223 break; 2224 2225 default: 2226 error = EINVAL; 2227 break; 2228 } 2229 return (error); 2230 } 2231 2232 /* 2233 * Initialize the vnode associated with a new inode, handle aliased 2234 * vnodes. 2235 */ 2236 int 2237 ufs_vinit(mntp, fifoops, vpp) 2238 struct mount *mntp; 2239 struct vop_vector *fifoops; 2240 struct vnode **vpp; 2241 { 2242 struct inode *ip; 2243 struct vnode *vp; 2244 2245 vp = *vpp; 2246 ip = VTOI(vp); 2247 vp->v_type = IFTOVT(ip->i_mode); 2248 if (vp->v_type == VFIFO) 2249 vp->v_op = fifoops; 2250 ASSERT_VOP_LOCKED(vp, "ufs_vinit"); 2251 if (ip->i_number == ROOTINO) 2252 vp->v_vflag |= VV_ROOT; 2253 *vpp = vp; 2254 return (0); 2255 } 2256 2257 /* 2258 * Allocate a new inode. 2259 * Vnode dvp must be locked. 2260 */ 2261 static int 2262 ufs_makeinode(mode, dvp, vpp, cnp) 2263 int mode; 2264 struct vnode *dvp; 2265 struct vnode **vpp; 2266 struct componentname *cnp; 2267 { 2268 struct inode *ip, *pdir; 2269 struct direct newdir; 2270 struct vnode *tvp; 2271 #ifdef UFS_ACL 2272 struct acl *acl; 2273 #endif 2274 int error; 2275 2276 pdir = VTOI(dvp); 2277 #ifdef INVARIANTS 2278 if ((cnp->cn_flags & HASBUF) == 0) 2279 panic("ufs_makeinode: no name"); 2280 #endif 2281 *vpp = NULL; 2282 if ((mode & IFMT) == 0) 2283 mode |= IFREG; 2284 2285 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2286 if (error) 2287 return (error); 2288 ip = VTOI(tvp); 2289 ip->i_gid = pdir->i_gid; 2290 DIP_SET(ip, i_gid, pdir->i_gid); 2291 #ifdef SUIDDIR 2292 { 2293 #ifdef QUOTA 2294 struct ucred ucred, *ucp; 2295 gid_t ucred_group; 2296 ucp = cnp->cn_cred; 2297 #endif 2298 /* 2299 * If we are not the owner of the directory, 2300 * and we are hacking owners here, (only do this where told to) 2301 * and we are not giving it TO root, (would subvert quotas) 2302 * then go ahead and give it to the other user. 2303 * Note that this drops off the execute bits for security. 2304 */ 2305 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2306 (pdir->i_mode & ISUID) && 2307 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2308 ip->i_uid = pdir->i_uid; 2309 DIP_SET(ip, i_uid, ip->i_uid); 2310 mode &= ~07111; 2311 #ifdef QUOTA 2312 /* 2313 * Make sure the correct user gets charged 2314 * for the space. 2315 * Quickly knock up a dummy credential for the victim. 2316 * XXX This seems to never be accessed out of our 2317 * context so a stack variable is ok. 2318 */ 2319 refcount_init(&ucred.cr_ref, 1); 2320 ucred.cr_uid = ip->i_uid; 2321 ucred.cr_ngroups = 1; 2322 ucred.cr_groups = &ucred_group; 2323 ucred.cr_groups[0] = pdir->i_gid; 2324 ucp = &ucred; 2325 #endif 2326 } else { 2327 ip->i_uid = cnp->cn_cred->cr_uid; 2328 DIP_SET(ip, i_uid, ip->i_uid); 2329 } 2330 2331 #ifdef QUOTA 2332 if ((error = getinoquota(ip)) || 2333 (error = chkiq(ip, 1, ucp, 0))) { 2334 UFS_VFREE(tvp, ip->i_number, mode); 2335 vput(tvp); 2336 return (error); 2337 } 2338 #endif 2339 } 2340 #else /* !SUIDDIR */ 2341 ip->i_uid = cnp->cn_cred->cr_uid; 2342 DIP_SET(ip, i_uid, ip->i_uid); 2343 #ifdef QUOTA 2344 if ((error = getinoquota(ip)) || 2345 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2346 UFS_VFREE(tvp, ip->i_number, mode); 2347 vput(tvp); 2348 return (error); 2349 } 2350 #endif 2351 #endif /* !SUIDDIR */ 2352 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2353 #ifdef UFS_ACL 2354 acl = NULL; 2355 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 2356 acl = acl_alloc(M_WAITOK); 2357 2358 /* 2359 * Retrieve default ACL for parent, if any. 2360 */ 2361 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 2362 cnp->cn_thread); 2363 switch (error) { 2364 case 0: 2365 /* 2366 * Retrieved a default ACL, so merge mode and ACL if 2367 * necessary. 2368 */ 2369 if (acl->acl_cnt != 0) { 2370 /* 2371 * Two possible ways for default ACL to not 2372 * be present. First, the EA can be 2373 * undefined, or second, the default ACL can 2374 * be blank. If it's blank, fall through to 2375 * the it's not defined case. 2376 */ 2377 mode = acl_posix1e_newfilemode(mode, acl); 2378 ip->i_mode = mode; 2379 DIP_SET(ip, i_mode, mode); 2380 ufs_sync_acl_from_inode(ip, acl); 2381 break; 2382 } 2383 /* FALLTHROUGH */ 2384 2385 case EOPNOTSUPP: 2386 /* 2387 * Just use the mode as-is. 2388 */ 2389 ip->i_mode = mode; 2390 DIP_SET(ip, i_mode, mode); 2391 acl_free(acl); 2392 acl = NULL; 2393 break; 2394 2395 default: 2396 UFS_VFREE(tvp, ip->i_number, mode); 2397 vput(tvp); 2398 acl_free(acl); 2399 acl = NULL; 2400 return (error); 2401 } 2402 } else { 2403 #endif 2404 ip->i_mode = mode; 2405 DIP_SET(ip, i_mode, mode); 2406 #ifdef UFS_ACL 2407 } 2408 #endif 2409 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2410 ip->i_effnlink = 1; 2411 ip->i_nlink = 1; 2412 DIP_SET(ip, i_nlink, 1); 2413 if (DOINGSOFTDEP(tvp)) 2414 softdep_change_linkcnt(ip); 2415 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2416 priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) { 2417 ip->i_mode &= ~ISGID; 2418 DIP_SET(ip, i_mode, ip->i_mode); 2419 } 2420 2421 if (cnp->cn_flags & ISWHITEOUT) { 2422 ip->i_flags |= UF_OPAQUE; 2423 DIP_SET(ip, i_flags, ip->i_flags); 2424 } 2425 2426 /* 2427 * Make sure inode goes to disk before directory entry. 2428 */ 2429 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2430 if (error) 2431 goto bad; 2432 #ifdef MAC 2433 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 2434 error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount, 2435 dvp, tvp, cnp); 2436 if (error) 2437 goto bad; 2438 } 2439 #endif 2440 #ifdef UFS_ACL 2441 if (acl != NULL) { 2442 /* 2443 * XXX: If we abort now, will Soft Updates notify the extattr 2444 * code that the EAs for the file need to be released? 2445 */ 2446 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 2447 cnp->cn_thread); 2448 switch (error) { 2449 case 0: 2450 break; 2451 2452 case EOPNOTSUPP: 2453 /* 2454 * XXX: This should not happen, as EOPNOTSUPP above was 2455 * supposed to free acl. 2456 */ 2457 printf("ufs_makeinode: VOP_GETACL() but no " 2458 "VOP_SETACL()\n"); 2459 /* panic("ufs_makeinode: VOP_GETACL() but no " 2460 "VOP_SETACL()"); */ 2461 break; 2462 2463 default: 2464 acl_free(acl); 2465 goto bad; 2466 } 2467 acl_free(acl); 2468 } 2469 #endif /* !UFS_ACL */ 2470 ufs_makedirentry(ip, cnp, &newdir); 2471 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2472 if (error) 2473 goto bad; 2474 *vpp = tvp; 2475 return (0); 2476 2477 bad: 2478 /* 2479 * Write error occurred trying to update the inode 2480 * or the directory so must deallocate the inode. 2481 */ 2482 ip->i_effnlink = 0; 2483 ip->i_nlink = 0; 2484 DIP_SET(ip, i_nlink, 0); 2485 ip->i_flag |= IN_CHANGE; 2486 if (DOINGSOFTDEP(tvp)) 2487 softdep_change_linkcnt(ip); 2488 vput(tvp); 2489 return (error); 2490 } 2491 2492 /* Global vfs data structures for ufs. */ 2493 struct vop_vector ufs_vnodeops = { 2494 .vop_default = &default_vnodeops, 2495 .vop_fsync = VOP_PANIC, 2496 .vop_read = VOP_PANIC, 2497 .vop_reallocblks = VOP_PANIC, 2498 .vop_write = VOP_PANIC, 2499 .vop_access = ufs_access, 2500 .vop_bmap = ufs_bmap, 2501 .vop_cachedlookup = ufs_lookup, 2502 .vop_close = ufs_close, 2503 .vop_create = ufs_create, 2504 .vop_getattr = ufs_getattr, 2505 .vop_inactive = ufs_inactive, 2506 .vop_link = ufs_link, 2507 .vop_lookup = vfs_cache_lookup, 2508 .vop_markatime = ufs_markatime, 2509 .vop_mkdir = ufs_mkdir, 2510 .vop_mknod = ufs_mknod, 2511 .vop_open = ufs_open, 2512 .vop_pathconf = ufs_pathconf, 2513 .vop_poll = vop_stdpoll, 2514 .vop_print = ufs_print, 2515 .vop_readdir = ufs_readdir, 2516 .vop_readlink = ufs_readlink, 2517 .vop_reclaim = ufs_reclaim, 2518 .vop_remove = ufs_remove, 2519 .vop_rename = ufs_rename, 2520 .vop_rmdir = ufs_rmdir, 2521 .vop_setattr = ufs_setattr, 2522 #ifdef MAC 2523 .vop_setlabel = vop_stdsetlabel_ea, 2524 #endif 2525 .vop_strategy = ufs_strategy, 2526 .vop_symlink = ufs_symlink, 2527 .vop_whiteout = ufs_whiteout, 2528 #ifdef UFS_EXTATTR 2529 .vop_getextattr = ufs_getextattr, 2530 .vop_deleteextattr = ufs_deleteextattr, 2531 .vop_setextattr = ufs_setextattr, 2532 #endif 2533 #ifdef UFS_ACL 2534 .vop_getacl = ufs_getacl, 2535 .vop_setacl = ufs_setacl, 2536 .vop_aclcheck = ufs_aclcheck, 2537 #endif 2538 }; 2539 2540 struct vop_vector ufs_fifoops = { 2541 .vop_default = &fifo_specops, 2542 .vop_fsync = VOP_PANIC, 2543 .vop_access = ufs_access, 2544 .vop_close = ufsfifo_close, 2545 .vop_getattr = ufs_getattr, 2546 .vop_inactive = ufs_inactive, 2547 .vop_kqfilter = ufsfifo_kqfilter, 2548 .vop_markatime = ufs_markatime, 2549 .vop_pathconf = ufsfifo_pathconf, 2550 .vop_print = ufs_print, 2551 .vop_read = VOP_PANIC, 2552 .vop_reclaim = ufs_reclaim, 2553 .vop_setattr = ufs_setattr, 2554 #ifdef MAC 2555 .vop_setlabel = vop_stdsetlabel_ea, 2556 #endif 2557 .vop_write = VOP_PANIC, 2558 #ifdef UFS_EXTATTR 2559 .vop_getextattr = ufs_getextattr, 2560 .vop_deleteextattr = ufs_deleteextattr, 2561 .vop_setextattr = ufs_setextattr, 2562 #endif 2563 #ifdef UFS_ACL 2564 .vop_getacl = ufs_getacl, 2565 .vop_setacl = ufs_setacl, 2566 .vop_aclcheck = ufs_aclcheck, 2567 #endif 2568 };
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