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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/7.4/sys/ufs/ufs/ufs_vnops.c 194696 2009-06-23 10:59:59Z kib $"); 39 40 #include "opt_mac.h" 41 #include "opt_quota.h" 42 #include "opt_suiddir.h" 43 #include "opt_ufs.h" 44 #include "opt_ffs.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/malloc.h> 49 #include <sys/namei.h> 50 #include <sys/kernel.h> 51 #include <sys/fcntl.h> 52 #include <sys/stat.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/mount.h> 56 #include <sys/priv.h> 57 #include <sys/refcount.h> 58 #include <sys/unistd.h> 59 #include <sys/vnode.h> 60 #include <sys/dirent.h> 61 #include <sys/lockf.h> 62 #include <sys/conf.h> 63 #include <sys/acl.h> 64 #include <sys/jail.h> 65 66 #include <machine/mutex.h> 67 68 #include <security/mac/mac_framework.h> 69 70 #include <sys/file.h> /* XXX */ 71 72 #include <vm/vm.h> 73 #include <vm/vm_extern.h> 74 75 #include <fs/fifofs/fifo.h> 76 77 #include <ufs/ufs/acl.h> 78 #include <ufs/ufs/extattr.h> 79 #include <ufs/ufs/quota.h> 80 #include <ufs/ufs/inode.h> 81 #include <ufs/ufs/dir.h> 82 #include <ufs/ufs/ufsmount.h> 83 #include <ufs/ufs/ufs_extern.h> 84 #ifdef UFS_DIRHASH 85 #include <ufs/ufs/dirhash.h> 86 #endif 87 #ifdef UFS_GJOURNAL 88 #include <ufs/ufs/gjournal.h> 89 #endif 90 91 #include <ufs/ffs/ffs_extern.h> 92 93 static vop_access_t ufs_access; 94 static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *); 95 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *); 96 static vop_close_t ufs_close; 97 static vop_create_t ufs_create; 98 static vop_getattr_t ufs_getattr; 99 static vop_link_t ufs_link; 100 static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 101 static vop_mkdir_t ufs_mkdir; 102 static vop_mknod_t ufs_mknod; 103 static vop_open_t ufs_open; 104 static vop_pathconf_t ufs_pathconf; 105 static vop_print_t ufs_print; 106 static vop_readlink_t ufs_readlink; 107 static vop_remove_t ufs_remove; 108 static vop_rename_t ufs_rename; 109 static vop_rmdir_t ufs_rmdir; 110 static vop_setattr_t ufs_setattr; 111 static vop_strategy_t ufs_strategy; 112 static vop_symlink_t ufs_symlink; 113 static vop_whiteout_t ufs_whiteout; 114 static vop_close_t ufsfifo_close; 115 static vop_kqfilter_t ufsfifo_kqfilter; 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 ip->i_modrev++; 160 } 161 if (ip->i_flag & IN_CHANGE) { 162 DIP_SET(ip, i_ctime, ts.tv_sec); 163 DIP_SET(ip, i_ctimensec, ts.tv_nsec); 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 int a_mode; 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 mode_t mode = ap->a_mode; 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 (mode & 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, ap->a_td) != 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, ap->a_td); 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, ap->a_td); 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 ((mode & 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 = uma_zalloc(acl_zone, 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_mode, 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_mode, 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_mode, ap->a_cred, NULL); 399 } 400 uma_zfree(acl_zone, 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_mode, 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 struct thread *a_td; 416 } */ *ap; 417 { 418 struct vnode *vp = ap->a_vp; 419 struct inode *ip = VTOI(vp); 420 struct vattr *vap = ap->a_vap; 421 422 VI_LOCK(vp); 423 ufs_itimes_locked(vp); 424 if (ip->i_ump->um_fstype == UFS1) { 425 vap->va_atime.tv_sec = ip->i_din1->di_atime; 426 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec; 427 } else { 428 vap->va_atime.tv_sec = ip->i_din2->di_atime; 429 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec; 430 } 431 VI_UNLOCK(vp); 432 /* 433 * Copy from inode table 434 */ 435 vap->va_fsid = dev2udev(ip->i_dev); 436 vap->va_fileid = ip->i_number; 437 vap->va_mode = ip->i_mode & ~IFMT; 438 vap->va_nlink = ip->i_effnlink; 439 vap->va_uid = ip->i_uid; 440 vap->va_gid = ip->i_gid; 441 if (ip->i_ump->um_fstype == UFS1) { 442 vap->va_rdev = ip->i_din1->di_rdev; 443 vap->va_size = ip->i_din1->di_size; 444 vap->va_mtime.tv_sec = ip->i_din1->di_mtime; 445 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec; 446 vap->va_ctime.tv_sec = ip->i_din1->di_ctime; 447 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec; 448 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks); 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 } 460 vap->va_flags = ip->i_flags; 461 vap->va_gen = ip->i_gen; 462 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 463 vap->va_type = IFTOVT(ip->i_mode); 464 vap->va_filerev = ip->i_modrev; 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 struct thread *a_td; 478 } */ *ap; 479 { 480 struct vattr *vap = ap->a_vap; 481 struct vnode *vp = ap->a_vp; 482 struct inode *ip = VTOI(vp); 483 struct ucred *cred = ap->a_cred; 484 struct thread *td = ap->a_td; 485 int error; 486 487 /* 488 * Check for unsettable attributes. 489 */ 490 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 491 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 492 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 493 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 494 return (EINVAL); 495 } 496 /* 497 * Mark for update the file's access time for vfs_mark_atime(). 498 * We are doing this here to avoid some of the checks done 499 * below -- this operation is done by request of the kernel and 500 * should bypass some security checks. Things like read-only 501 * checks get handled by other levels (e.g., ffs_update()). 502 */ 503 if (vap->va_vaflags & VA_MARK_ATIME) { 504 ip->i_flag |= IN_ACCESS; 505 return (0); 506 } 507 if (vap->va_flags != VNOVAL) { 508 if (vp->v_mount->mnt_flag & MNT_RDONLY) 509 return (EROFS); 510 /* 511 * Callers may only modify the file flags on objects they 512 * have VADMIN rights for. 513 */ 514 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 515 return (error); 516 /* 517 * Unprivileged processes are not permitted to unset system 518 * flags, or modify flags if any system flags are set. 519 * Privileged non-jail processes may not modify system flags 520 * if securelevel > 0 and any existing system flags are set. 521 * Privileged jail processes behave like privileged non-jail 522 * processes if the security.jail.chflags_allowed sysctl is 523 * is non-zero; otherwise, they behave like unprivileged 524 * processes. 525 */ 526 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 527 if (ip->i_flags 528 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 529 error = securelevel_gt(cred, 0); 530 if (error) 531 return (error); 532 } 533 /* Snapshot flag cannot be set or cleared */ 534 if (((vap->va_flags & SF_SNAPSHOT) != 0 && 535 (ip->i_flags & SF_SNAPSHOT) == 0) || 536 ((vap->va_flags & SF_SNAPSHOT) == 0 && 537 (ip->i_flags & SF_SNAPSHOT) != 0)) 538 return (EPERM); 539 ip->i_flags = vap->va_flags; 540 DIP_SET(ip, i_flags, vap->va_flags); 541 } else { 542 if (ip->i_flags 543 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 544 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 545 return (EPERM); 546 ip->i_flags &= SF_SETTABLE; 547 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 548 DIP_SET(ip, i_flags, ip->i_flags); 549 } 550 ip->i_flag |= IN_CHANGE; 551 if (vap->va_flags & (IMMUTABLE | APPEND)) 552 return (0); 553 } 554 if (ip->i_flags & (IMMUTABLE | APPEND)) 555 return (EPERM); 556 /* 557 * Go through the fields and update iff not VNOVAL. 558 */ 559 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 560 if (vp->v_mount->mnt_flag & MNT_RDONLY) 561 return (EROFS); 562 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, 563 td)) != 0) 564 return (error); 565 } 566 if (vap->va_size != VNOVAL) { 567 /* 568 * XXX most of the following special cases should be in 569 * callers instead of in N filesystems. The VDIR check 570 * mostly already is. 571 */ 572 switch (vp->v_type) { 573 case VDIR: 574 return (EISDIR); 575 case VLNK: 576 case VREG: 577 /* 578 * Truncation should have an effect in these cases. 579 * Disallow it if the filesystem is read-only or 580 * the file is being snapshotted. 581 */ 582 if (vp->v_mount->mnt_flag & MNT_RDONLY) 583 return (EROFS); 584 if ((ip->i_flags & SF_SNAPSHOT) != 0) 585 return (EPERM); 586 break; 587 default: 588 /* 589 * According to POSIX, the result is unspecified 590 * for file types other than regular files, 591 * directories and shared memory objects. We 592 * don't support shared memory objects in the file 593 * system, and have dubious support for truncating 594 * symlinks. Just ignore the request in other cases. 595 */ 596 return (0); 597 } 598 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL, 599 cred, td)) != 0) 600 return (error); 601 } 602 if (vap->va_atime.tv_sec != VNOVAL || 603 vap->va_mtime.tv_sec != VNOVAL || 604 vap->va_birthtime.tv_sec != VNOVAL) { 605 if (vp->v_mount->mnt_flag & MNT_RDONLY) 606 return (EROFS); 607 if ((ip->i_flags & SF_SNAPSHOT) != 0) 608 return (EPERM); 609 /* 610 * From utimes(2): 611 * If times is NULL, ... The caller must be the owner of 612 * the file, have permission to write the file, or be the 613 * super-user. 614 * If times is non-NULL, ... The caller must be the owner of 615 * the file or be the super-user. 616 * 617 * Possibly for historical reasons, try to use VADMIN in 618 * preference to VWRITE for a NULL timestamp. This means we 619 * will return EACCES in preference to EPERM if neither 620 * check succeeds. 621 */ 622 if (vap->va_vaflags & VA_UTIMES_NULL) { 623 error = VOP_ACCESS(vp, VADMIN, cred, td); 624 if (error) 625 error = VOP_ACCESS(vp, VWRITE, cred, td); 626 } else 627 error = VOP_ACCESS(vp, VADMIN, cred, td); 628 if (error) 629 return (error); 630 if (vap->va_atime.tv_sec != VNOVAL) 631 ip->i_flag |= IN_ACCESS; 632 if (vap->va_mtime.tv_sec != VNOVAL) 633 ip->i_flag |= IN_CHANGE | IN_UPDATE; 634 if (vap->va_birthtime.tv_sec != VNOVAL && 635 ip->i_ump->um_fstype == UFS2) 636 ip->i_flag |= IN_MODIFIED; 637 ufs_itimes(vp); 638 if (vap->va_atime.tv_sec != VNOVAL) { 639 DIP_SET(ip, i_atime, vap->va_atime.tv_sec); 640 DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec); 641 } 642 if (vap->va_mtime.tv_sec != VNOVAL) { 643 DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec); 644 DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec); 645 } 646 if (vap->va_birthtime.tv_sec != VNOVAL && 647 ip->i_ump->um_fstype == UFS2) { 648 ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec; 649 ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec; 650 } 651 error = UFS_UPDATE(vp, 0); 652 if (error) 653 return (error); 654 } 655 error = 0; 656 if (vap->va_mode != (mode_t)VNOVAL) { 657 if (vp->v_mount->mnt_flag & MNT_RDONLY) 658 return (EROFS); 659 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode & 660 (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH))) 661 return (EPERM); 662 error = ufs_chmod(vp, (int)vap->va_mode, cred, td); 663 } 664 return (error); 665 } 666 667 /* 668 * Change the mode on a file. 669 * Inode must be locked before calling. 670 */ 671 static int 672 ufs_chmod(vp, mode, cred, td) 673 struct vnode *vp; 674 int mode; 675 struct ucred *cred; 676 struct thread *td; 677 { 678 struct inode *ip = VTOI(vp); 679 int error; 680 681 /* 682 * To modify the permissions on a file, must possess VADMIN 683 * for that file. 684 */ 685 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 686 return (error); 687 /* 688 * Privileged processes may set the sticky bit on non-directories, 689 * as well as set the setgid bit on a file with a group that the 690 * process is not a member of. Both of these are allowed in 691 * jail(8). 692 */ 693 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 694 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 695 return (EFTYPE); 696 } 697 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 698 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 699 if (error) 700 return (error); 701 } 702 ip->i_mode &= ~ALLPERMS; 703 ip->i_mode |= (mode & ALLPERMS); 704 DIP_SET(ip, i_mode, ip->i_mode); 705 ip->i_flag |= IN_CHANGE; 706 return (0); 707 } 708 709 /* 710 * Perform chown operation on inode ip; 711 * inode must be locked prior to call. 712 */ 713 static int 714 ufs_chown(vp, uid, gid, cred, td) 715 struct vnode *vp; 716 uid_t uid; 717 gid_t gid; 718 struct ucred *cred; 719 struct thread *td; 720 { 721 struct inode *ip = VTOI(vp); 722 uid_t ouid; 723 gid_t ogid; 724 int error = 0; 725 #ifdef QUOTA 726 int i; 727 ufs2_daddr_t change; 728 #endif 729 730 if (uid == (uid_t)VNOVAL) 731 uid = ip->i_uid; 732 if (gid == (gid_t)VNOVAL) 733 gid = ip->i_gid; 734 /* 735 * To modify the ownership of a file, must possess VADMIN for that 736 * file. 737 */ 738 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 739 return (error); 740 /* 741 * To change the owner of a file, or change the group of a file to a 742 * group of which we are not a member, the caller must have 743 * privilege. 744 */ 745 if ((uid != ip->i_uid || 746 (gid != ip->i_gid && !groupmember(gid, cred))) && 747 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 748 return (error); 749 ogid = ip->i_gid; 750 ouid = ip->i_uid; 751 #ifdef QUOTA 752 if ((error = getinoquota(ip)) != 0) 753 return (error); 754 if (ouid == uid) { 755 dqrele(vp, ip->i_dquot[USRQUOTA]); 756 ip->i_dquot[USRQUOTA] = NODQUOT; 757 } 758 if (ogid == gid) { 759 dqrele(vp, ip->i_dquot[GRPQUOTA]); 760 ip->i_dquot[GRPQUOTA] = NODQUOT; 761 } 762 change = DIP(ip, i_blocks); 763 (void) chkdq(ip, -change, cred, CHOWN); 764 (void) chkiq(ip, -1, cred, CHOWN); 765 for (i = 0; i < MAXQUOTAS; i++) { 766 dqrele(vp, ip->i_dquot[i]); 767 ip->i_dquot[i] = NODQUOT; 768 } 769 #endif 770 ip->i_gid = gid; 771 DIP_SET(ip, i_gid, gid); 772 ip->i_uid = uid; 773 DIP_SET(ip, i_uid, uid); 774 #ifdef QUOTA 775 if ((error = getinoquota(ip)) == 0) { 776 if (ouid == uid) { 777 dqrele(vp, ip->i_dquot[USRQUOTA]); 778 ip->i_dquot[USRQUOTA] = NODQUOT; 779 } 780 if (ogid == gid) { 781 dqrele(vp, ip->i_dquot[GRPQUOTA]); 782 ip->i_dquot[GRPQUOTA] = NODQUOT; 783 } 784 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 785 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 786 goto good; 787 else 788 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 789 } 790 for (i = 0; i < MAXQUOTAS; i++) { 791 dqrele(vp, ip->i_dquot[i]); 792 ip->i_dquot[i] = NODQUOT; 793 } 794 } 795 ip->i_gid = ogid; 796 DIP_SET(ip, i_gid, ogid); 797 ip->i_uid = ouid; 798 DIP_SET(ip, i_uid, ouid); 799 if (getinoquota(ip) == 0) { 800 if (ouid == uid) { 801 dqrele(vp, ip->i_dquot[USRQUOTA]); 802 ip->i_dquot[USRQUOTA] = NODQUOT; 803 } 804 if (ogid == gid) { 805 dqrele(vp, ip->i_dquot[GRPQUOTA]); 806 ip->i_dquot[GRPQUOTA] = NODQUOT; 807 } 808 (void) chkdq(ip, change, cred, FORCE|CHOWN); 809 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 810 (void) getinoquota(ip); 811 } 812 return (error); 813 good: 814 if (getinoquota(ip)) 815 panic("ufs_chown: lost quota"); 816 #endif /* QUOTA */ 817 ip->i_flag |= IN_CHANGE; 818 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 819 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) { 820 ip->i_mode &= ~(ISUID | ISGID); 821 DIP_SET(ip, i_mode, ip->i_mode); 822 } 823 } 824 return (0); 825 } 826 827 static int 828 ufs_remove(ap) 829 struct vop_remove_args /* { 830 struct vnode *a_dvp; 831 struct vnode *a_vp; 832 struct componentname *a_cnp; 833 } */ *ap; 834 { 835 struct inode *ip; 836 struct vnode *vp = ap->a_vp; 837 struct vnode *dvp = ap->a_dvp; 838 int error; 839 struct thread *td; 840 841 td = curthread; 842 ip = VTOI(vp); 843 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 844 (VTOI(dvp)->i_flags & APPEND)) { 845 error = EPERM; 846 goto out; 847 } 848 #ifdef UFS_GJOURNAL 849 ufs_gjournal_orphan(vp); 850 #endif 851 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 852 if (ip->i_nlink <= 0) 853 vp->v_vflag |= VV_NOSYNC; 854 if ((ip->i_flags & SF_SNAPSHOT) != 0) { 855 /* 856 * Avoid deadlock where another thread is trying to 857 * update the inodeblock for dvp and is waiting on 858 * snaplk. Temporary unlock the vnode lock for the 859 * unlinked file and sync the directory. This should 860 * allow vput() of the directory to not block later on 861 * while holding the snapshot vnode locked, assuming 862 * that the directory hasn't been unlinked too. 863 */ 864 VOP_UNLOCK(vp, 0, td); 865 (void) VOP_FSYNC(dvp, MNT_WAIT, td); 866 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 867 } 868 out: 869 return (error); 870 } 871 872 /* 873 * link vnode call 874 */ 875 static int 876 ufs_link(ap) 877 struct vop_link_args /* { 878 struct vnode *a_tdvp; 879 struct vnode *a_vp; 880 struct componentname *a_cnp; 881 } */ *ap; 882 { 883 struct vnode *vp = ap->a_vp; 884 struct vnode *tdvp = ap->a_tdvp; 885 struct componentname *cnp = ap->a_cnp; 886 struct inode *ip; 887 struct direct newdir; 888 int error; 889 890 #ifdef INVARIANTS 891 if ((cnp->cn_flags & HASBUF) == 0) 892 panic("ufs_link: no name"); 893 #endif 894 if (tdvp->v_mount != vp->v_mount) { 895 error = EXDEV; 896 goto out; 897 } 898 ip = VTOI(vp); 899 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 900 error = EMLINK; 901 goto out; 902 } 903 if (ip->i_flags & (IMMUTABLE | APPEND)) { 904 error = EPERM; 905 goto out; 906 } 907 ip->i_effnlink++; 908 ip->i_nlink++; 909 DIP_SET(ip, i_nlink, ip->i_nlink); 910 ip->i_flag |= IN_CHANGE; 911 if (DOINGSOFTDEP(vp)) 912 softdep_change_linkcnt(ip); 913 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 914 if (!error) { 915 ufs_makedirentry(ip, cnp, &newdir); 916 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 917 } 918 919 if (error) { 920 ip->i_effnlink--; 921 ip->i_nlink--; 922 DIP_SET(ip, i_nlink, ip->i_nlink); 923 ip->i_flag |= IN_CHANGE; 924 if (DOINGSOFTDEP(vp)) 925 softdep_change_linkcnt(ip); 926 } 927 out: 928 return (error); 929 } 930 931 /* 932 * whiteout vnode call 933 */ 934 static int 935 ufs_whiteout(ap) 936 struct vop_whiteout_args /* { 937 struct vnode *a_dvp; 938 struct componentname *a_cnp; 939 int a_flags; 940 } */ *ap; 941 { 942 struct vnode *dvp = ap->a_dvp; 943 struct componentname *cnp = ap->a_cnp; 944 struct direct newdir; 945 int error = 0; 946 947 switch (ap->a_flags) { 948 case LOOKUP: 949 /* 4.4 format directories support whiteout operations */ 950 if (dvp->v_mount->mnt_maxsymlinklen > 0) 951 return (0); 952 return (EOPNOTSUPP); 953 954 case CREATE: 955 /* create a new directory whiteout */ 956 #ifdef INVARIANTS 957 if ((cnp->cn_flags & SAVENAME) == 0) 958 panic("ufs_whiteout: missing name"); 959 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 960 panic("ufs_whiteout: old format filesystem"); 961 #endif 962 963 newdir.d_ino = WINO; 964 newdir.d_namlen = cnp->cn_namelen; 965 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 966 newdir.d_type = DT_WHT; 967 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 968 break; 969 970 case DELETE: 971 /* remove an existing directory whiteout */ 972 #ifdef INVARIANTS 973 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 974 panic("ufs_whiteout: old format filesystem"); 975 #endif 976 977 cnp->cn_flags &= ~DOWHITEOUT; 978 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 979 break; 980 default: 981 panic("ufs_whiteout: unknown op"); 982 } 983 return (error); 984 } 985 986 /* 987 * Rename system call. 988 * rename("foo", "bar"); 989 * is essentially 990 * unlink("bar"); 991 * link("foo", "bar"); 992 * unlink("foo"); 993 * but ``atomically''. Can't do full commit without saving state in the 994 * inode on disk which isn't feasible at this time. Best we can do is 995 * always guarantee the target exists. 996 * 997 * Basic algorithm is: 998 * 999 * 1) Bump link count on source while we're linking it to the 1000 * target. This also ensure the inode won't be deleted out 1001 * from underneath us while we work (it may be truncated by 1002 * a concurrent `trunc' or `open' for creation). 1003 * 2) Link source to destination. If destination already exists, 1004 * delete it first. 1005 * 3) Unlink source reference to inode if still around. If a 1006 * directory was moved and the parent of the destination 1007 * is different from the source, patch the ".." entry in the 1008 * directory. 1009 */ 1010 static int 1011 ufs_rename(ap) 1012 struct vop_rename_args /* { 1013 struct vnode *a_fdvp; 1014 struct vnode *a_fvp; 1015 struct componentname *a_fcnp; 1016 struct vnode *a_tdvp; 1017 struct vnode *a_tvp; 1018 struct componentname *a_tcnp; 1019 } */ *ap; 1020 { 1021 struct vnode *tvp = ap->a_tvp; 1022 struct vnode *tdvp = ap->a_tdvp; 1023 struct vnode *fvp = ap->a_fvp; 1024 struct vnode *fdvp = ap->a_fdvp; 1025 struct componentname *tcnp = ap->a_tcnp; 1026 struct componentname *fcnp = ap->a_fcnp; 1027 struct thread *td = fcnp->cn_thread; 1028 struct inode *ip, *xp, *dp; 1029 struct direct newdir; 1030 int doingdirectory = 0, oldparent = 0, newparent = 0; 1031 int error = 0, ioflag; 1032 ino_t fvp_ino; 1033 1034 #ifdef INVARIANTS 1035 if ((tcnp->cn_flags & HASBUF) == 0 || 1036 (fcnp->cn_flags & HASBUF) == 0) 1037 panic("ufs_rename: no name"); 1038 #endif 1039 /* 1040 * Check for cross-device rename. 1041 */ 1042 if ((fvp->v_mount != tdvp->v_mount) || 1043 (tvp && (fvp->v_mount != tvp->v_mount))) { 1044 error = EXDEV; 1045 abortit: 1046 if (tdvp == tvp) 1047 vrele(tdvp); 1048 else 1049 vput(tdvp); 1050 if (tvp) 1051 vput(tvp); 1052 vrele(fdvp); 1053 vrele(fvp); 1054 return (error); 1055 } 1056 1057 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1058 (VTOI(tdvp)->i_flags & APPEND))) { 1059 error = EPERM; 1060 goto abortit; 1061 } 1062 1063 /* 1064 * Renaming a file to itself has no effect. The upper layers should 1065 * not call us in that case. Temporarily just warn if they do. 1066 */ 1067 if (fvp == tvp) { 1068 printf("ufs_rename: fvp == tvp (can't happen)\n"); 1069 error = 0; 1070 goto abortit; 1071 } 1072 1073 if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0) 1074 goto abortit; 1075 dp = VTOI(fdvp); 1076 ip = VTOI(fvp); 1077 if (ip->i_nlink >= LINK_MAX) { 1078 VOP_UNLOCK(fvp, 0, td); 1079 error = EMLINK; 1080 goto abortit; 1081 } 1082 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1083 || (dp->i_flags & APPEND)) { 1084 VOP_UNLOCK(fvp, 0, td); 1085 error = EPERM; 1086 goto abortit; 1087 } 1088 if ((ip->i_mode & IFMT) == IFDIR) { 1089 /* 1090 * Avoid ".", "..", and aliases of "." for obvious reasons. 1091 */ 1092 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1093 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 1094 (ip->i_flag & IN_RENAME)) { 1095 VOP_UNLOCK(fvp, 0, td); 1096 error = EINVAL; 1097 goto abortit; 1098 } 1099 ip->i_flag |= IN_RENAME; 1100 oldparent = dp->i_number; 1101 doingdirectory = 1; 1102 } 1103 vrele(fdvp); 1104 1105 /* 1106 * When the target exists, both the directory 1107 * and target vnodes are returned locked. 1108 */ 1109 dp = VTOI(tdvp); 1110 xp = NULL; 1111 if (tvp) 1112 xp = VTOI(tvp); 1113 1114 /* 1115 * 1) Bump link count while we're moving stuff 1116 * around. If we crash somewhere before 1117 * completing our work, the link count 1118 * may be wrong, but correctable. 1119 */ 1120 ip->i_effnlink++; 1121 ip->i_nlink++; 1122 DIP_SET(ip, i_nlink, ip->i_nlink); 1123 ip->i_flag |= IN_CHANGE; 1124 if (DOINGSOFTDEP(fvp)) 1125 softdep_change_linkcnt(ip); 1126 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 1127 DOINGASYNC(fvp)))) != 0) { 1128 VOP_UNLOCK(fvp, 0, td); 1129 goto bad; 1130 } 1131 1132 /* 1133 * If ".." must be changed (ie the directory gets a new 1134 * parent) then the source directory must not be in the 1135 * directory hierarchy above the target, as this would 1136 * orphan everything below the source directory. Also 1137 * the user must have write permission in the source so 1138 * as to be able to change "..". We must repeat the call 1139 * to namei, as the parent directory is unlocked by the 1140 * call to checkpath(). 1141 */ 1142 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1143 fvp_ino = ip->i_number; 1144 VOP_UNLOCK(fvp, 0, td); 1145 if (oldparent != dp->i_number) 1146 newparent = dp->i_number; 1147 if (doingdirectory && newparent) { 1148 if (error) /* write access check above */ 1149 goto bad; 1150 if (xp != NULL) 1151 vput(tvp); 1152 error = ufs_checkpath(fvp_ino, dp, tcnp->cn_cred); 1153 if (error) 1154 goto out; 1155 if ((tcnp->cn_flags & SAVESTART) == 0) 1156 panic("ufs_rename: lost to startdir"); 1157 VREF(tdvp); 1158 error = relookup(tdvp, &tvp, tcnp); 1159 if (error) 1160 goto out; 1161 vrele(tdvp); 1162 dp = VTOI(tdvp); 1163 xp = NULL; 1164 if (tvp) 1165 xp = VTOI(tvp); 1166 } 1167 /* 1168 * 2) If target doesn't exist, link the target 1169 * to the source and unlink the source. 1170 * Otherwise, rewrite the target directory 1171 * entry to reference the source inode and 1172 * expunge the original entry's existence. 1173 */ 1174 if (xp == NULL) { 1175 if (dp->i_dev != ip->i_dev) 1176 panic("ufs_rename: EXDEV"); 1177 /* 1178 * Account for ".." in new directory. 1179 * When source and destination have the same 1180 * parent we don't fool with the link count. 1181 */ 1182 if (doingdirectory && newparent) { 1183 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1184 error = EMLINK; 1185 goto bad; 1186 } 1187 dp->i_effnlink++; 1188 dp->i_nlink++; 1189 DIP_SET(dp, i_nlink, dp->i_nlink); 1190 dp->i_flag |= IN_CHANGE; 1191 if (DOINGSOFTDEP(tdvp)) 1192 softdep_change_linkcnt(dp); 1193 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1194 DOINGASYNC(tdvp))); 1195 if (error) 1196 goto bad; 1197 } 1198 ufs_makedirentry(ip, tcnp, &newdir); 1199 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1200 if (error) { 1201 if (doingdirectory && newparent) { 1202 dp->i_effnlink--; 1203 dp->i_nlink--; 1204 DIP_SET(dp, i_nlink, dp->i_nlink); 1205 dp->i_flag |= IN_CHANGE; 1206 if (DOINGSOFTDEP(tdvp)) 1207 softdep_change_linkcnt(dp); 1208 (void)UFS_UPDATE(tdvp, 1); 1209 } 1210 goto bad; 1211 } 1212 vput(tdvp); 1213 } else { 1214 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1215 panic("ufs_rename: EXDEV"); 1216 /* 1217 * Short circuit rename(foo, foo). 1218 */ 1219 if (xp->i_number == ip->i_number) 1220 panic("ufs_rename: same file"); 1221 /* 1222 * If the parent directory is "sticky", then the caller 1223 * must possess VADMIN for the parent directory, or the 1224 * destination of the rename. This implements append-only 1225 * directories. 1226 */ 1227 if ((dp->i_mode & S_ISTXT) && 1228 VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) && 1229 VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) { 1230 error = EPERM; 1231 goto bad; 1232 } 1233 /* 1234 * Target must be empty if a directory and have no links 1235 * to it. Also, ensure source and target are compatible 1236 * (both directories, or both not directories). 1237 */ 1238 if ((xp->i_mode&IFMT) == IFDIR) { 1239 if ((xp->i_effnlink > 2) || 1240 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1241 error = ENOTEMPTY; 1242 goto bad; 1243 } 1244 if (!doingdirectory) { 1245 error = ENOTDIR; 1246 goto bad; 1247 } 1248 cache_purge(tdvp); 1249 } else if (doingdirectory) { 1250 error = EISDIR; 1251 goto bad; 1252 } 1253 error = ufs_dirrewrite(dp, xp, ip->i_number, 1254 IFTODT(ip->i_mode), 1255 (doingdirectory && newparent) ? newparent : doingdirectory); 1256 if (error) 1257 goto bad; 1258 if (doingdirectory) { 1259 if (!newparent) { 1260 dp->i_effnlink--; 1261 if (DOINGSOFTDEP(tdvp)) 1262 softdep_change_linkcnt(dp); 1263 } 1264 xp->i_effnlink--; 1265 if (DOINGSOFTDEP(tvp)) 1266 softdep_change_linkcnt(xp); 1267 } 1268 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1269 /* 1270 * Truncate inode. The only stuff left in the directory 1271 * is "." and "..". The "." reference is inconsequential 1272 * since we are quashing it. We have removed the "." 1273 * reference and the reference in the parent directory, 1274 * but there may be other hard links. The soft 1275 * dependency code will arrange to do these operations 1276 * after the parent directory entry has been deleted on 1277 * disk, so when running with that code we avoid doing 1278 * them now. 1279 */ 1280 if (!newparent) { 1281 dp->i_nlink--; 1282 DIP_SET(dp, i_nlink, dp->i_nlink); 1283 dp->i_flag |= IN_CHANGE; 1284 } 1285 xp->i_nlink--; 1286 DIP_SET(xp, i_nlink, xp->i_nlink); 1287 xp->i_flag |= IN_CHANGE; 1288 ioflag = IO_NORMAL; 1289 if (!DOINGASYNC(tvp)) 1290 ioflag |= IO_SYNC; 1291 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1292 tcnp->cn_cred, tcnp->cn_thread)) != 0) 1293 goto bad; 1294 } 1295 vput(tdvp); 1296 vput(tvp); 1297 xp = NULL; 1298 } 1299 1300 /* 1301 * 3) Unlink the source. 1302 */ 1303 fcnp->cn_flags &= ~MODMASK; 1304 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1305 if ((fcnp->cn_flags & SAVESTART) == 0) 1306 panic("ufs_rename: lost from startdir"); 1307 VREF(fdvp); 1308 error = relookup(fdvp, &fvp, fcnp); 1309 if (error == 0) 1310 vrele(fdvp); 1311 if (fvp != NULL) { 1312 xp = VTOI(fvp); 1313 dp = VTOI(fdvp); 1314 } else { 1315 /* 1316 * From name has disappeared. IN_RENAME is not sufficient 1317 * to protect against directory races due to timing windows, 1318 * so we have to remove the panic. XXX the only real way 1319 * to solve this issue is at a much higher level. By the 1320 * time we hit ufs_rename() it's too late. 1321 */ 1322 #if 0 1323 if (doingdirectory) 1324 panic("ufs_rename: lost dir entry"); 1325 #endif 1326 vrele(ap->a_fvp); 1327 return (0); 1328 } 1329 /* 1330 * Ensure that the directory entry still exists and has not 1331 * changed while the new name has been entered. If the source is 1332 * a file then the entry may have been unlinked or renamed. In 1333 * either case there is no further work to be done. If the source 1334 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1335 * flag ensures that it cannot be moved by another rename or removed 1336 * by a rmdir. 1337 */ 1338 if (xp != ip) { 1339 /* 1340 * From name resolves to a different inode. IN_RENAME is 1341 * not sufficient protection against timing window races 1342 * so we can't panic here. XXX the only real way 1343 * to solve this issue is at a much higher level. By the 1344 * time we hit ufs_rename() it's too late. 1345 */ 1346 #if 0 1347 if (doingdirectory) 1348 panic("ufs_rename: lost dir entry"); 1349 #endif 1350 } else { 1351 /* 1352 * If the source is a directory with a 1353 * new parent, the link count of the old 1354 * parent directory must be decremented 1355 * and ".." set to point to the new parent. 1356 */ 1357 if (doingdirectory && newparent) { 1358 xp->i_offset = mastertemplate.dot_reclen; 1359 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1360 cache_purge(fdvp); 1361 } 1362 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1363 xp->i_flag &= ~IN_RENAME; 1364 } 1365 if (dp) 1366 vput(fdvp); 1367 if (xp) 1368 vput(fvp); 1369 vrele(ap->a_fvp); 1370 return (error); 1371 1372 bad: 1373 if (xp) 1374 vput(ITOV(xp)); 1375 vput(ITOV(dp)); 1376 out: 1377 if (doingdirectory) 1378 ip->i_flag &= ~IN_RENAME; 1379 if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) { 1380 ip->i_effnlink--; 1381 ip->i_nlink--; 1382 DIP_SET(ip, i_nlink, ip->i_nlink); 1383 ip->i_flag |= IN_CHANGE; 1384 ip->i_flag &= ~IN_RENAME; 1385 if (DOINGSOFTDEP(fvp)) 1386 softdep_change_linkcnt(ip); 1387 vput(fvp); 1388 } else 1389 vrele(fvp); 1390 return (error); 1391 } 1392 1393 /* 1394 * Mkdir system call 1395 */ 1396 static int 1397 ufs_mkdir(ap) 1398 struct vop_mkdir_args /* { 1399 struct vnode *a_dvp; 1400 struct vnode **a_vpp; 1401 struct componentname *a_cnp; 1402 struct vattr *a_vap; 1403 } */ *ap; 1404 { 1405 struct vnode *dvp = ap->a_dvp; 1406 struct vattr *vap = ap->a_vap; 1407 struct componentname *cnp = ap->a_cnp; 1408 struct inode *ip, *dp; 1409 struct vnode *tvp; 1410 struct buf *bp; 1411 struct dirtemplate dirtemplate, *dtp; 1412 struct direct newdir; 1413 #ifdef UFS_ACL 1414 struct acl *acl, *dacl; 1415 #endif 1416 int error, dmode; 1417 long blkoff; 1418 1419 #ifdef INVARIANTS 1420 if ((cnp->cn_flags & HASBUF) == 0) 1421 panic("ufs_mkdir: no name"); 1422 #endif 1423 dp = VTOI(dvp); 1424 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1425 error = EMLINK; 1426 goto out; 1427 } 1428 dmode = vap->va_mode & 0777; 1429 dmode |= IFDIR; 1430 /* 1431 * Must simulate part of ufs_makeinode here to acquire the inode, 1432 * but not have it entered in the parent directory. The entry is 1433 * made later after writing "." and ".." entries. 1434 */ 1435 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1436 if (error) 1437 goto out; 1438 ip = VTOI(tvp); 1439 ip->i_gid = dp->i_gid; 1440 DIP_SET(ip, i_gid, dp->i_gid); 1441 #ifdef SUIDDIR 1442 { 1443 #ifdef QUOTA 1444 struct ucred ucred, *ucp; 1445 ucp = cnp->cn_cred; 1446 #endif 1447 /* 1448 * If we are hacking owners here, (only do this where told to) 1449 * and we are not giving it TO root, (would subvert quotas) 1450 * then go ahead and give it to the other user. 1451 * The new directory also inherits the SUID bit. 1452 * If user's UID and dir UID are the same, 1453 * 'give it away' so that the SUID is still forced on. 1454 */ 1455 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1456 (dp->i_mode & ISUID) && dp->i_uid) { 1457 dmode |= ISUID; 1458 ip->i_uid = dp->i_uid; 1459 DIP_SET(ip, i_uid, dp->i_uid); 1460 #ifdef QUOTA 1461 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1462 /* 1463 * Make sure the correct user gets charged 1464 * for the space. 1465 * Make a dummy credential for the victim. 1466 * XXX This seems to never be accessed out of 1467 * our context so a stack variable is ok. 1468 */ 1469 refcount_init(&ucred.cr_ref, 1); 1470 ucred.cr_uid = ip->i_uid; 1471 ucred.cr_ngroups = 1; 1472 ucred.cr_groups[0] = dp->i_gid; 1473 ucp = &ucred; 1474 } 1475 #endif 1476 } else { 1477 ip->i_uid = cnp->cn_cred->cr_uid; 1478 DIP_SET(ip, i_uid, ip->i_uid); 1479 } 1480 #ifdef QUOTA 1481 if ((error = getinoquota(ip)) || 1482 (error = chkiq(ip, 1, ucp, 0))) { 1483 UFS_VFREE(tvp, ip->i_number, dmode); 1484 vput(tvp); 1485 return (error); 1486 } 1487 #endif 1488 } 1489 #else /* !SUIDDIR */ 1490 ip->i_uid = cnp->cn_cred->cr_uid; 1491 DIP_SET(ip, i_uid, ip->i_uid); 1492 #ifdef QUOTA 1493 if ((error = getinoquota(ip)) || 1494 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1495 UFS_VFREE(tvp, ip->i_number, dmode); 1496 vput(tvp); 1497 return (error); 1498 } 1499 #endif 1500 #endif /* !SUIDDIR */ 1501 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1502 #ifdef UFS_ACL 1503 acl = dacl = NULL; 1504 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 1505 acl = uma_zalloc(acl_zone, M_WAITOK); 1506 dacl = uma_zalloc(acl_zone, M_WAITOK); 1507 1508 /* 1509 * Retrieve default ACL from parent, if any. 1510 */ 1511 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 1512 cnp->cn_thread); 1513 switch (error) { 1514 case 0: 1515 /* 1516 * Retrieved a default ACL, so merge mode and ACL if 1517 * necessary. If the ACL is empty, fall through to 1518 * the "not defined or available" case. 1519 */ 1520 if (acl->acl_cnt != 0) { 1521 dmode = acl_posix1e_newfilemode(dmode, acl); 1522 ip->i_mode = dmode; 1523 DIP_SET(ip, i_mode, dmode); 1524 *dacl = *acl; 1525 ufs_sync_acl_from_inode(ip, acl); 1526 break; 1527 } 1528 /* FALLTHROUGH */ 1529 1530 case EOPNOTSUPP: 1531 /* 1532 * Just use the mode as-is. 1533 */ 1534 ip->i_mode = dmode; 1535 DIP_SET(ip, i_mode, dmode); 1536 uma_zfree(acl_zone, acl); 1537 uma_zfree(acl_zone, dacl); 1538 dacl = acl = NULL; 1539 break; 1540 1541 default: 1542 UFS_VFREE(tvp, ip->i_number, dmode); 1543 vput(tvp); 1544 uma_zfree(acl_zone, acl); 1545 uma_zfree(acl_zone, dacl); 1546 return (error); 1547 } 1548 } else { 1549 #endif /* !UFS_ACL */ 1550 ip->i_mode = dmode; 1551 DIP_SET(ip, i_mode, dmode); 1552 #ifdef UFS_ACL 1553 } 1554 #endif 1555 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1556 ip->i_effnlink = 2; 1557 ip->i_nlink = 2; 1558 DIP_SET(ip, i_nlink, 2); 1559 if (DOINGSOFTDEP(tvp)) 1560 softdep_change_linkcnt(ip); 1561 if (cnp->cn_flags & ISWHITEOUT) { 1562 ip->i_flags |= UF_OPAQUE; 1563 DIP_SET(ip, i_flags, ip->i_flags); 1564 } 1565 1566 /* 1567 * Bump link count in parent directory to reflect work done below. 1568 * Should be done before reference is created so cleanup is 1569 * possible if we crash. 1570 */ 1571 dp->i_effnlink++; 1572 dp->i_nlink++; 1573 DIP_SET(dp, i_nlink, dp->i_nlink); 1574 dp->i_flag |= IN_CHANGE; 1575 if (DOINGSOFTDEP(dvp)) 1576 softdep_change_linkcnt(dp); 1577 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1578 if (error) 1579 goto bad; 1580 #ifdef MAC 1581 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 1582 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 1583 dvp, tvp, cnp); 1584 if (error) 1585 goto bad; 1586 } 1587 #endif 1588 #ifdef UFS_ACL 1589 if (acl != NULL) { 1590 /* 1591 * XXX: If we abort now, will Soft Updates notify the extattr 1592 * code that the EAs for the file need to be released? 1593 */ 1594 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 1595 cnp->cn_thread); 1596 if (error == 0) 1597 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, 1598 cnp->cn_cred, cnp->cn_thread); 1599 switch (error) { 1600 case 0: 1601 break; 1602 1603 case EOPNOTSUPP: 1604 /* 1605 * XXX: This should not happen, as EOPNOTSUPP above 1606 * was supposed to free acl. 1607 */ 1608 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1609 /* 1610 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()"); 1611 */ 1612 break; 1613 1614 default: 1615 uma_zfree(acl_zone, acl); 1616 uma_zfree(acl_zone, dacl); 1617 dacl = acl = NULL; 1618 goto bad; 1619 } 1620 uma_zfree(acl_zone, acl); 1621 uma_zfree(acl_zone, dacl); 1622 dacl = acl = NULL; 1623 } 1624 #endif /* !UFS_ACL */ 1625 1626 /* 1627 * Initialize directory with "." and ".." from static template. 1628 */ 1629 if (dvp->v_mount->mnt_maxsymlinklen > 0) 1630 dtp = &mastertemplate; 1631 else 1632 dtp = (struct dirtemplate *)&omastertemplate; 1633 dirtemplate = *dtp; 1634 dirtemplate.dot_ino = ip->i_number; 1635 dirtemplate.dotdot_ino = dp->i_number; 1636 if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1637 BA_CLRBUF, &bp)) != 0) 1638 goto bad; 1639 ip->i_size = DIRBLKSIZ; 1640 DIP_SET(ip, i_size, DIRBLKSIZ); 1641 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1642 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1643 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1644 if (DOINGSOFTDEP(tvp)) { 1645 /* 1646 * Ensure that the entire newly allocated block is a 1647 * valid directory so that future growth within the 1648 * block does not have to ensure that the block is 1649 * written before the inode. 1650 */ 1651 blkoff = DIRBLKSIZ; 1652 while (blkoff < bp->b_bcount) { 1653 ((struct direct *) 1654 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1655 blkoff += DIRBLKSIZ; 1656 } 1657 } 1658 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1659 DOINGASYNC(tvp)))) != 0) { 1660 (void)bwrite(bp); 1661 goto bad; 1662 } 1663 /* 1664 * Directory set up, now install its entry in the parent directory. 1665 * 1666 * If we are not doing soft dependencies, then we must write out the 1667 * buffer containing the new directory body before entering the new 1668 * name in the parent. If we are doing soft dependencies, then the 1669 * buffer containing the new directory body will be passed to and 1670 * released in the soft dependency code after the code has attached 1671 * an appropriate ordering dependency to the buffer which ensures that 1672 * the buffer is written before the new name is written in the parent. 1673 */ 1674 if (DOINGASYNC(dvp)) 1675 bdwrite(bp); 1676 else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp)))) 1677 goto bad; 1678 ufs_makedirentry(ip, cnp, &newdir); 1679 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1680 1681 bad: 1682 if (error == 0) { 1683 *ap->a_vpp = tvp; 1684 } else { 1685 #ifdef UFS_ACL 1686 if (acl != NULL) 1687 uma_zfree(acl_zone, acl); 1688 if (dacl != NULL) 1689 uma_zfree(acl_zone, dacl); 1690 #endif 1691 dp->i_effnlink--; 1692 dp->i_nlink--; 1693 DIP_SET(dp, i_nlink, dp->i_nlink); 1694 dp->i_flag |= IN_CHANGE; 1695 if (DOINGSOFTDEP(dvp)) 1696 softdep_change_linkcnt(dp); 1697 /* 1698 * No need to do an explicit VOP_TRUNCATE here, vrele will 1699 * do this for us because we set the link count to 0. 1700 */ 1701 ip->i_effnlink = 0; 1702 ip->i_nlink = 0; 1703 DIP_SET(ip, i_nlink, 0); 1704 ip->i_flag |= IN_CHANGE; 1705 if (DOINGSOFTDEP(tvp)) 1706 softdep_change_linkcnt(ip); 1707 vput(tvp); 1708 } 1709 out: 1710 return (error); 1711 } 1712 1713 /* 1714 * Rmdir system call. 1715 */ 1716 static int 1717 ufs_rmdir(ap) 1718 struct vop_rmdir_args /* { 1719 struct vnode *a_dvp; 1720 struct vnode *a_vp; 1721 struct componentname *a_cnp; 1722 } */ *ap; 1723 { 1724 struct vnode *vp = ap->a_vp; 1725 struct vnode *dvp = ap->a_dvp; 1726 struct componentname *cnp = ap->a_cnp; 1727 struct inode *ip, *dp; 1728 int error, ioflag; 1729 1730 ip = VTOI(vp); 1731 dp = VTOI(dvp); 1732 1733 /* 1734 * Do not remove a directory that is in the process of being renamed. 1735 * Verify the directory is empty (and valid). Rmdir ".." will not be 1736 * valid since ".." will contain a reference to the current directory 1737 * and thus be non-empty. Do not allow the removal of mounted on 1738 * directories (this can happen when an NFS exported filesystem 1739 * tries to remove a locally mounted on directory). 1740 */ 1741 error = 0; 1742 if ((ip->i_flag & IN_RENAME) || ip->i_effnlink < 2) { 1743 error = EINVAL; 1744 goto out; 1745 } 1746 if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1747 error = ENOTEMPTY; 1748 goto out; 1749 } 1750 if ((dp->i_flags & APPEND) 1751 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1752 error = EPERM; 1753 goto out; 1754 } 1755 if (vp->v_mountedhere != 0) { 1756 error = EINVAL; 1757 goto out; 1758 } 1759 #ifdef UFS_GJOURNAL 1760 ufs_gjournal_orphan(vp); 1761 #endif 1762 /* 1763 * Delete reference to directory before purging 1764 * inode. If we crash in between, the directory 1765 * will be reattached to lost+found, 1766 */ 1767 dp->i_effnlink--; 1768 ip->i_effnlink--; 1769 if (DOINGSOFTDEP(vp)) { 1770 softdep_change_linkcnt(dp); 1771 softdep_change_linkcnt(ip); 1772 } 1773 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1774 if (error) { 1775 dp->i_effnlink++; 1776 ip->i_effnlink++; 1777 if (DOINGSOFTDEP(vp)) { 1778 softdep_change_linkcnt(dp); 1779 softdep_change_linkcnt(ip); 1780 } 1781 goto out; 1782 } 1783 cache_purge(dvp); 1784 /* 1785 * Truncate inode. The only stuff left in the directory is "." and 1786 * "..". The "." reference is inconsequential since we are quashing 1787 * it. The soft dependency code will arrange to do these operations 1788 * after the parent directory entry has been deleted on disk, so 1789 * when running with that code we avoid doing them now. 1790 */ 1791 if (!DOINGSOFTDEP(vp)) { 1792 dp->i_nlink--; 1793 DIP_SET(dp, i_nlink, dp->i_nlink); 1794 dp->i_flag |= IN_CHANGE; 1795 ip->i_nlink--; 1796 DIP_SET(ip, i_nlink, ip->i_nlink); 1797 ip->i_flag |= IN_CHANGE; 1798 ioflag = IO_NORMAL; 1799 if (!DOINGASYNC(vp)) 1800 ioflag |= IO_SYNC; 1801 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1802 cnp->cn_thread); 1803 } 1804 cache_purge(vp); 1805 #ifdef UFS_DIRHASH 1806 /* Kill any active hash; i_effnlink == 0, so it will not come back. */ 1807 if (ip->i_dirhash != NULL) 1808 ufsdirhash_free(ip); 1809 #endif 1810 out: 1811 return (error); 1812 } 1813 1814 /* 1815 * symlink -- make a symbolic link 1816 */ 1817 static int 1818 ufs_symlink(ap) 1819 struct vop_symlink_args /* { 1820 struct vnode *a_dvp; 1821 struct vnode **a_vpp; 1822 struct componentname *a_cnp; 1823 struct vattr *a_vap; 1824 char *a_target; 1825 } */ *ap; 1826 { 1827 struct vnode *vp, **vpp = ap->a_vpp; 1828 struct inode *ip; 1829 int len, error; 1830 1831 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1832 vpp, ap->a_cnp); 1833 if (error) 1834 return (error); 1835 vp = *vpp; 1836 len = strlen(ap->a_target); 1837 if (len < vp->v_mount->mnt_maxsymlinklen) { 1838 ip = VTOI(vp); 1839 bcopy(ap->a_target, SHORTLINK(ip), len); 1840 ip->i_size = len; 1841 DIP_SET(ip, i_size, len); 1842 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1843 } else 1844 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1845 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1846 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1847 if (error) 1848 vput(vp); 1849 return (error); 1850 } 1851 1852 /* 1853 * Vnode op for reading directories. 1854 * 1855 * The routine below assumes that the on-disk format of a directory 1856 * is the same as that defined by <sys/dirent.h>. If the on-disk 1857 * format changes, then it will be necessary to do a conversion 1858 * from the on-disk format that read returns to the format defined 1859 * by <sys/dirent.h>. 1860 */ 1861 int 1862 ufs_readdir(ap) 1863 struct vop_readdir_args /* { 1864 struct vnode *a_vp; 1865 struct uio *a_uio; 1866 struct ucred *a_cred; 1867 int *a_eofflag; 1868 int *a_ncookies; 1869 u_long **a_cookies; 1870 } */ *ap; 1871 { 1872 struct uio *uio = ap->a_uio; 1873 int error; 1874 size_t count, lost; 1875 off_t off; 1876 1877 if (ap->a_ncookies != NULL) 1878 /* 1879 * Ensure that the block is aligned. The caller can use 1880 * the cookies to determine where in the block to start. 1881 */ 1882 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1883 off = uio->uio_offset; 1884 count = uio->uio_resid; 1885 /* Make sure we don't return partial entries. */ 1886 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1887 return (EINVAL); 1888 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1889 lost = uio->uio_resid - count; 1890 uio->uio_resid = count; 1891 uio->uio_iov->iov_len = count; 1892 # if (BYTE_ORDER == LITTLE_ENDIAN) 1893 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1894 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1895 } else { 1896 struct dirent *dp, *edp; 1897 struct uio auio; 1898 struct iovec aiov; 1899 caddr_t dirbuf; 1900 int readcnt; 1901 u_char tmp; 1902 1903 auio = *uio; 1904 auio.uio_iov = &aiov; 1905 auio.uio_iovcnt = 1; 1906 auio.uio_segflg = UIO_SYSSPACE; 1907 aiov.iov_len = count; 1908 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); 1909 aiov.iov_base = dirbuf; 1910 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1911 if (error == 0) { 1912 readcnt = count - auio.uio_resid; 1913 edp = (struct dirent *)&dirbuf[readcnt]; 1914 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1915 tmp = dp->d_namlen; 1916 dp->d_namlen = dp->d_type; 1917 dp->d_type = tmp; 1918 if (dp->d_reclen > 0) { 1919 dp = (struct dirent *) 1920 ((char *)dp + dp->d_reclen); 1921 } else { 1922 error = EIO; 1923 break; 1924 } 1925 } 1926 if (dp >= edp) 1927 error = uiomove(dirbuf, readcnt, uio); 1928 } 1929 FREE(dirbuf, M_TEMP); 1930 } 1931 # else 1932 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1933 # endif 1934 if (!error && ap->a_ncookies != NULL) { 1935 struct dirent* dpStart; 1936 struct dirent* dpEnd; 1937 struct dirent* dp; 1938 int ncookies; 1939 u_long *cookies; 1940 u_long *cookiep; 1941 1942 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1943 panic("ufs_readdir: unexpected uio from NFS server"); 1944 dpStart = (struct dirent *) 1945 ((char *)uio->uio_iov->iov_base - (uio->uio_offset - off)); 1946 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1947 for (dp = dpStart, ncookies = 0; 1948 dp < dpEnd; 1949 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1950 ncookies++; 1951 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1952 M_WAITOK); 1953 for (dp = dpStart, cookiep = cookies; 1954 dp < dpEnd; 1955 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1956 off += dp->d_reclen; 1957 *cookiep++ = (u_long) off; 1958 } 1959 *ap->a_ncookies = ncookies; 1960 *ap->a_cookies = cookies; 1961 } 1962 uio->uio_resid += lost; 1963 if (ap->a_eofflag) 1964 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1965 return (error); 1966 } 1967 1968 /* 1969 * Return target name of a symbolic link 1970 */ 1971 static int 1972 ufs_readlink(ap) 1973 struct vop_readlink_args /* { 1974 struct vnode *a_vp; 1975 struct uio *a_uio; 1976 struct ucred *a_cred; 1977 } */ *ap; 1978 { 1979 struct vnode *vp = ap->a_vp; 1980 struct inode *ip = VTOI(vp); 1981 doff_t isize; 1982 1983 isize = ip->i_size; 1984 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1985 DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */ 1986 return (uiomove(SHORTLINK(ip), isize, ap->a_uio)); 1987 } 1988 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1989 } 1990 1991 /* 1992 * Calculate the logical to physical mapping if not done already, 1993 * then call the device strategy routine. 1994 * 1995 * In order to be able to swap to a file, the ufs_bmaparray() operation may not 1996 * deadlock on memory. See ufs_bmap() for details. 1997 */ 1998 static int 1999 ufs_strategy(ap) 2000 struct vop_strategy_args /* { 2001 struct vnode *a_vp; 2002 struct buf *a_bp; 2003 } */ *ap; 2004 { 2005 struct buf *bp = ap->a_bp; 2006 struct vnode *vp = ap->a_vp; 2007 struct bufobj *bo; 2008 struct inode *ip; 2009 ufs2_daddr_t blkno; 2010 int error; 2011 2012 ip = VTOI(vp); 2013 if (bp->b_blkno == bp->b_lblkno) { 2014 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL); 2015 bp->b_blkno = blkno; 2016 if (error) { 2017 bp->b_error = error; 2018 bp->b_ioflags |= BIO_ERROR; 2019 bufdone(bp); 2020 return (0); 2021 } 2022 if ((long)bp->b_blkno == -1) 2023 vfs_bio_clrbuf(bp); 2024 } 2025 if ((long)bp->b_blkno == -1) { 2026 bufdone(bp); 2027 return (0); 2028 } 2029 bp->b_iooffset = dbtob(bp->b_blkno); 2030 bo = ip->i_umbufobj; 2031 BO_STRATEGY(bo, bp); 2032 return (0); 2033 } 2034 2035 /* 2036 * Print out the contents of an inode. 2037 */ 2038 static int 2039 ufs_print(ap) 2040 struct vop_print_args /* { 2041 struct vnode *a_vp; 2042 } */ *ap; 2043 { 2044 struct vnode *vp = ap->a_vp; 2045 struct inode *ip = VTOI(vp); 2046 2047 printf("\tino %lu, on dev %s", (u_long)ip->i_number, 2048 devtoname(ip->i_dev)); 2049 if (vp->v_type == VFIFO) 2050 fifo_printinfo(vp); 2051 printf("\n"); 2052 return (0); 2053 } 2054 2055 /* 2056 * Close wrapper for fifos. 2057 * 2058 * Update the times on the inode then do device close. 2059 */ 2060 static int 2061 ufsfifo_close(ap) 2062 struct vop_close_args /* { 2063 struct vnode *a_vp; 2064 int a_fflag; 2065 struct ucred *a_cred; 2066 struct thread *a_td; 2067 } */ *ap; 2068 { 2069 struct vnode *vp = ap->a_vp; 2070 int usecount; 2071 2072 VI_LOCK(vp); 2073 usecount = vp->v_usecount; 2074 if (usecount > 1) 2075 ufs_itimes_locked(vp); 2076 VI_UNLOCK(vp); 2077 return (fifo_specops.vop_close(ap)); 2078 } 2079 2080 /* 2081 * Kqfilter wrapper for fifos. 2082 * 2083 * Fall through to ufs kqfilter routines if needed 2084 */ 2085 static int 2086 ufsfifo_kqfilter(ap) 2087 struct vop_kqfilter_args *ap; 2088 { 2089 int error; 2090 2091 error = fifo_specops.vop_kqfilter(ap); 2092 if (error) 2093 error = vfs_kqfilter(ap); 2094 return (error); 2095 } 2096 2097 /* 2098 * Return POSIX pathconf information applicable to ufs filesystems. 2099 */ 2100 static int 2101 ufs_pathconf(ap) 2102 struct vop_pathconf_args /* { 2103 struct vnode *a_vp; 2104 int a_name; 2105 int *a_retval; 2106 } */ *ap; 2107 { 2108 int error; 2109 2110 error = 0; 2111 switch (ap->a_name) { 2112 case _PC_LINK_MAX: 2113 *ap->a_retval = LINK_MAX; 2114 break; 2115 case _PC_NAME_MAX: 2116 *ap->a_retval = NAME_MAX; 2117 break; 2118 case _PC_PATH_MAX: 2119 *ap->a_retval = PATH_MAX; 2120 break; 2121 case _PC_PIPE_BUF: 2122 *ap->a_retval = PIPE_BUF; 2123 break; 2124 case _PC_CHOWN_RESTRICTED: 2125 *ap->a_retval = 1; 2126 break; 2127 case _PC_NO_TRUNC: 2128 *ap->a_retval = 1; 2129 break; 2130 case _PC_ACL_EXTENDED: 2131 #ifdef UFS_ACL 2132 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2133 *ap->a_retval = 1; 2134 else 2135 *ap->a_retval = 0; 2136 #else 2137 *ap->a_retval = 0; 2138 #endif 2139 break; 2140 case _PC_ACL_PATH_MAX: 2141 #ifdef UFS_ACL 2142 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2143 *ap->a_retval = ACL_MAX_ENTRIES; 2144 else 2145 *ap->a_retval = 3; 2146 #else 2147 *ap->a_retval = 3; 2148 #endif 2149 break; 2150 case _PC_MAC_PRESENT: 2151 #ifdef MAC 2152 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL) 2153 *ap->a_retval = 1; 2154 else 2155 *ap->a_retval = 0; 2156 #else 2157 *ap->a_retval = 0; 2158 #endif 2159 break; 2160 case _PC_ASYNC_IO: 2161 /* _PC_ASYNC_IO should have been handled by upper layers. */ 2162 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 2163 error = EINVAL; 2164 break; 2165 case _PC_PRIO_IO: 2166 *ap->a_retval = 0; 2167 break; 2168 case _PC_SYNC_IO: 2169 *ap->a_retval = 0; 2170 break; 2171 case _PC_ALLOC_SIZE_MIN: 2172 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 2173 break; 2174 case _PC_FILESIZEBITS: 2175 *ap->a_retval = 64; 2176 break; 2177 case _PC_REC_INCR_XFER_SIZE: 2178 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2179 break; 2180 case _PC_REC_MAX_XFER_SIZE: 2181 *ap->a_retval = -1; /* means ``unlimited'' */ 2182 break; 2183 case _PC_REC_MIN_XFER_SIZE: 2184 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2185 break; 2186 case _PC_REC_XFER_ALIGN: 2187 *ap->a_retval = PAGE_SIZE; 2188 break; 2189 case _PC_SYMLINK_MAX: 2190 *ap->a_retval = MAXPATHLEN; 2191 break; 2192 2193 default: 2194 error = EINVAL; 2195 break; 2196 } 2197 return (error); 2198 } 2199 2200 /* 2201 * Initialize the vnode associated with a new inode, handle aliased 2202 * vnodes. 2203 */ 2204 int 2205 ufs_vinit(mntp, fifoops, vpp) 2206 struct mount *mntp; 2207 struct vop_vector *fifoops; 2208 struct vnode **vpp; 2209 { 2210 struct inode *ip; 2211 struct vnode *vp; 2212 2213 vp = *vpp; 2214 ip = VTOI(vp); 2215 vp->v_type = IFTOVT(ip->i_mode); 2216 if (vp->v_type == VFIFO) 2217 vp->v_op = fifoops; 2218 ASSERT_VOP_LOCKED(vp, "ufs_vinit"); 2219 if (ip->i_number == ROOTINO) 2220 vp->v_vflag |= VV_ROOT; 2221 ip->i_modrev = init_va_filerev(); 2222 *vpp = vp; 2223 return (0); 2224 } 2225 2226 /* 2227 * Allocate a new inode. 2228 * Vnode dvp must be locked. 2229 */ 2230 static int 2231 ufs_makeinode(mode, dvp, vpp, cnp) 2232 int mode; 2233 struct vnode *dvp; 2234 struct vnode **vpp; 2235 struct componentname *cnp; 2236 { 2237 struct inode *ip, *pdir; 2238 struct direct newdir; 2239 struct vnode *tvp; 2240 #ifdef UFS_ACL 2241 struct acl *acl; 2242 #endif 2243 int error; 2244 2245 pdir = VTOI(dvp); 2246 #ifdef INVARIANTS 2247 if ((cnp->cn_flags & HASBUF) == 0) 2248 panic("ufs_makeinode: no name"); 2249 #endif 2250 *vpp = NULL; 2251 if ((mode & IFMT) == 0) 2252 mode |= IFREG; 2253 2254 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2255 if (error) 2256 return (error); 2257 ip = VTOI(tvp); 2258 ip->i_gid = pdir->i_gid; 2259 DIP_SET(ip, i_gid, pdir->i_gid); 2260 #ifdef SUIDDIR 2261 { 2262 #ifdef QUOTA 2263 struct ucred ucred, *ucp; 2264 ucp = cnp->cn_cred; 2265 #endif 2266 /* 2267 * If we are not the owner of the directory, 2268 * and we are hacking owners here, (only do this where told to) 2269 * and we are not giving it TO root, (would subvert quotas) 2270 * then go ahead and give it to the other user. 2271 * Note that this drops off the execute bits for security. 2272 */ 2273 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2274 (pdir->i_mode & ISUID) && 2275 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2276 ip->i_uid = pdir->i_uid; 2277 DIP_SET(ip, i_uid, ip->i_uid); 2278 mode &= ~07111; 2279 #ifdef QUOTA 2280 /* 2281 * Make sure the correct user gets charged 2282 * for the space. 2283 * Quickly knock up a dummy credential for the victim. 2284 * XXX This seems to never be accessed out of our 2285 * context so a stack variable is ok. 2286 */ 2287 refcount_init(&ucred.cr_ref, 1); 2288 ucred.cr_uid = ip->i_uid; 2289 ucred.cr_ngroups = 1; 2290 ucred.cr_groups[0] = pdir->i_gid; 2291 ucp = &ucred; 2292 #endif 2293 } else { 2294 ip->i_uid = cnp->cn_cred->cr_uid; 2295 DIP_SET(ip, i_uid, ip->i_uid); 2296 } 2297 2298 #ifdef QUOTA 2299 if ((error = getinoquota(ip)) || 2300 (error = chkiq(ip, 1, ucp, 0))) { 2301 UFS_VFREE(tvp, ip->i_number, mode); 2302 vput(tvp); 2303 return (error); 2304 } 2305 #endif 2306 } 2307 #else /* !SUIDDIR */ 2308 ip->i_uid = cnp->cn_cred->cr_uid; 2309 DIP_SET(ip, i_uid, ip->i_uid); 2310 #ifdef QUOTA 2311 if ((error = getinoquota(ip)) || 2312 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2313 UFS_VFREE(tvp, ip->i_number, mode); 2314 vput(tvp); 2315 return (error); 2316 } 2317 #endif 2318 #endif /* !SUIDDIR */ 2319 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2320 #ifdef UFS_ACL 2321 acl = NULL; 2322 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 2323 acl = uma_zalloc(acl_zone, M_WAITOK); 2324 2325 /* 2326 * Retrieve default ACL for parent, if any. 2327 */ 2328 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 2329 cnp->cn_thread); 2330 switch (error) { 2331 case 0: 2332 /* 2333 * Retrieved a default ACL, so merge mode and ACL if 2334 * necessary. 2335 */ 2336 if (acl->acl_cnt != 0) { 2337 /* 2338 * Two possible ways for default ACL to not 2339 * be present. First, the EA can be 2340 * undefined, or second, the default ACL can 2341 * be blank. If it's blank, fall through to 2342 * the it's not defined case. 2343 */ 2344 mode = acl_posix1e_newfilemode(mode, acl); 2345 ip->i_mode = mode; 2346 DIP_SET(ip, i_mode, mode); 2347 ufs_sync_acl_from_inode(ip, acl); 2348 break; 2349 } 2350 /* FALLTHROUGH */ 2351 2352 case EOPNOTSUPP: 2353 /* 2354 * Just use the mode as-is. 2355 */ 2356 ip->i_mode = mode; 2357 DIP_SET(ip, i_mode, mode); 2358 uma_zfree(acl_zone, acl); 2359 acl = NULL; 2360 break; 2361 2362 default: 2363 UFS_VFREE(tvp, ip->i_number, mode); 2364 vput(tvp); 2365 uma_zfree(acl_zone, acl); 2366 acl = NULL; 2367 return (error); 2368 } 2369 } else { 2370 #endif 2371 ip->i_mode = mode; 2372 DIP_SET(ip, i_mode, mode); 2373 #ifdef UFS_ACL 2374 } 2375 #endif 2376 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2377 ip->i_effnlink = 1; 2378 ip->i_nlink = 1; 2379 DIP_SET(ip, i_nlink, 1); 2380 if (DOINGSOFTDEP(tvp)) 2381 softdep_change_linkcnt(ip); 2382 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2383 priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) { 2384 ip->i_mode &= ~ISGID; 2385 DIP_SET(ip, i_mode, ip->i_mode); 2386 } 2387 2388 if (cnp->cn_flags & ISWHITEOUT) { 2389 ip->i_flags |= UF_OPAQUE; 2390 DIP_SET(ip, i_flags, ip->i_flags); 2391 } 2392 2393 /* 2394 * Make sure inode goes to disk before directory entry. 2395 */ 2396 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2397 if (error) 2398 goto bad; 2399 #ifdef MAC 2400 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 2401 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 2402 dvp, tvp, cnp); 2403 if (error) 2404 goto bad; 2405 } 2406 #endif 2407 #ifdef UFS_ACL 2408 if (acl != NULL) { 2409 /* 2410 * XXX: If we abort now, will Soft Updates notify the extattr 2411 * code that the EAs for the file need to be released? 2412 */ 2413 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 2414 cnp->cn_thread); 2415 switch (error) { 2416 case 0: 2417 break; 2418 2419 case EOPNOTSUPP: 2420 /* 2421 * XXX: This should not happen, as EOPNOTSUPP above was 2422 * supposed to free acl. 2423 */ 2424 printf("ufs_makeinode: VOP_GETACL() but no " 2425 "VOP_SETACL()\n"); 2426 /* panic("ufs_makeinode: VOP_GETACL() but no " 2427 "VOP_SETACL()"); */ 2428 break; 2429 2430 default: 2431 uma_zfree(acl_zone, acl); 2432 goto bad; 2433 } 2434 uma_zfree(acl_zone, acl); 2435 } 2436 #endif /* !UFS_ACL */ 2437 ufs_makedirentry(ip, cnp, &newdir); 2438 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2439 if (error) 2440 goto bad; 2441 *vpp = tvp; 2442 return (0); 2443 2444 bad: 2445 /* 2446 * Write error occurred trying to update the inode 2447 * or the directory so must deallocate the inode. 2448 */ 2449 ip->i_effnlink = 0; 2450 ip->i_nlink = 0; 2451 DIP_SET(ip, i_nlink, 0); 2452 ip->i_flag |= IN_CHANGE; 2453 if (DOINGSOFTDEP(tvp)) 2454 softdep_change_linkcnt(ip); 2455 vput(tvp); 2456 return (error); 2457 } 2458 2459 /* Global vfs data structures for ufs. */ 2460 struct vop_vector ufs_vnodeops = { 2461 .vop_default = &default_vnodeops, 2462 .vop_fsync = VOP_PANIC, 2463 .vop_read = VOP_PANIC, 2464 .vop_reallocblks = VOP_PANIC, 2465 .vop_write = VOP_PANIC, 2466 .vop_access = ufs_access, 2467 .vop_bmap = ufs_bmap, 2468 .vop_cachedlookup = ufs_lookup, 2469 .vop_close = ufs_close, 2470 .vop_create = ufs_create, 2471 .vop_getattr = ufs_getattr, 2472 .vop_inactive = ufs_inactive, 2473 .vop_link = ufs_link, 2474 .vop_lookup = vfs_cache_lookup, 2475 .vop_mkdir = ufs_mkdir, 2476 .vop_mknod = ufs_mknod, 2477 .vop_open = ufs_open, 2478 .vop_pathconf = ufs_pathconf, 2479 .vop_poll = vop_stdpoll, 2480 .vop_print = ufs_print, 2481 .vop_readdir = ufs_readdir, 2482 .vop_readlink = ufs_readlink, 2483 .vop_reclaim = ufs_reclaim, 2484 .vop_remove = ufs_remove, 2485 .vop_rename = ufs_rename, 2486 .vop_rmdir = ufs_rmdir, 2487 .vop_setattr = ufs_setattr, 2488 #ifdef MAC 2489 .vop_setlabel = vop_stdsetlabel_ea, 2490 #endif 2491 .vop_strategy = ufs_strategy, 2492 .vop_symlink = ufs_symlink, 2493 .vop_whiteout = ufs_whiteout, 2494 #ifdef UFS_EXTATTR 2495 .vop_getextattr = ufs_getextattr, 2496 .vop_deleteextattr = ufs_deleteextattr, 2497 .vop_setextattr = ufs_setextattr, 2498 #endif 2499 #ifdef UFS_ACL 2500 .vop_getacl = ufs_getacl, 2501 .vop_setacl = ufs_setacl, 2502 .vop_aclcheck = ufs_aclcheck, 2503 #endif 2504 }; 2505 2506 struct vop_vector ufs_fifoops = { 2507 .vop_default = &fifo_specops, 2508 .vop_fsync = VOP_PANIC, 2509 .vop_access = ufs_access, 2510 .vop_close = ufsfifo_close, 2511 .vop_getattr = ufs_getattr, 2512 .vop_inactive = ufs_inactive, 2513 .vop_kqfilter = ufsfifo_kqfilter, 2514 .vop_print = ufs_print, 2515 .vop_read = VOP_PANIC, 2516 .vop_reclaim = ufs_reclaim, 2517 .vop_setattr = ufs_setattr, 2518 #ifdef MAC 2519 .vop_setlabel = vop_stdsetlabel_ea, 2520 #endif 2521 .vop_write = VOP_PANIC, 2522 #ifdef UFS_EXTATTR 2523 .vop_getextattr = ufs_getextattr, 2524 .vop_deleteextattr = ufs_deleteextattr, 2525 .vop_setextattr = ufs_setextattr, 2526 #endif 2527 #ifdef UFS_ACL 2528 .vop_getacl = ufs_getacl, 2529 .vop_setacl = ufs_setacl, 2530 .vop_aclcheck = ufs_aclcheck, 2531 #endif 2532 };
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