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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("$FreeBSD$"); 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 vop_advlock_t ufs_advlock; 95 static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *); 96 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *); 97 static vop_close_t ufs_close; 98 static vop_create_t ufs_create; 99 static vop_getattr_t ufs_getattr; 100 static vop_link_t ufs_link; 101 static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 102 static vop_mkdir_t ufs_mkdir; 103 static vop_mknod_t ufs_mknod; 104 static vop_open_t ufs_open; 105 static vop_pathconf_t ufs_pathconf; 106 static vop_print_t ufs_print; 107 static vop_readlink_t ufs_readlink; 108 static vop_remove_t ufs_remove; 109 static vop_rename_t ufs_rename; 110 static vop_rmdir_t ufs_rmdir; 111 static vop_setattr_t ufs_setattr; 112 static vop_strategy_t ufs_strategy; 113 static vop_symlink_t ufs_symlink; 114 static vop_whiteout_t ufs_whiteout; 115 static vop_close_t ufsfifo_close; 116 static vop_kqfilter_t ufsfifo_kqfilter; 117 118 /* 119 * A virgin directory (no blushing please). 120 */ 121 static struct dirtemplate mastertemplate = { 122 0, 12, DT_DIR, 1, ".", 123 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." 124 }; 125 static struct odirtemplate omastertemplate = { 126 0, 12, 1, ".", 127 0, DIRBLKSIZ - 12, 2, ".." 128 }; 129 130 static void 131 ufs_itimes_locked(struct vnode *vp) 132 { 133 struct inode *ip; 134 struct timespec ts; 135 136 ASSERT_VI_LOCKED(vp, __func__); 137 138 ip = VTOI(vp); 139 if ((vp->v_mount->mnt_flag & MNT_RDONLY) != 0) 140 goto out; 141 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 142 return; 143 144 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp)) 145 ip->i_flag |= IN_LAZYMOD; 146 else if (((vp->v_mount->mnt_kern_flag & 147 (MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) || 148 (ip->i_flag & (IN_CHANGE | IN_UPDATE))) 149 ip->i_flag |= IN_MODIFIED; 150 else if (ip->i_flag & IN_ACCESS) 151 ip->i_flag |= IN_LAZYACCESS; 152 vfs_timestamp(&ts); 153 if (ip->i_flag & IN_ACCESS) { 154 DIP_SET(ip, i_atime, ts.tv_sec); 155 DIP_SET(ip, i_atimensec, ts.tv_nsec); 156 } 157 if (ip->i_flag & IN_UPDATE) { 158 DIP_SET(ip, i_mtime, ts.tv_sec); 159 DIP_SET(ip, i_mtimensec, ts.tv_nsec); 160 ip->i_modrev++; 161 } 162 if (ip->i_flag & IN_CHANGE) { 163 DIP_SET(ip, i_ctime, ts.tv_sec); 164 DIP_SET(ip, i_ctimensec, ts.tv_nsec); 165 } 166 167 out: 168 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 169 } 170 171 void 172 ufs_itimes(struct vnode *vp) 173 { 174 175 VI_LOCK(vp); 176 ufs_itimes_locked(vp); 177 VI_UNLOCK(vp); 178 } 179 180 /* 181 * Create a regular file 182 */ 183 static int 184 ufs_create(ap) 185 struct vop_create_args /* { 186 struct vnode *a_dvp; 187 struct vnode **a_vpp; 188 struct componentname *a_cnp; 189 struct vattr *a_vap; 190 } */ *ap; 191 { 192 int error; 193 194 error = 195 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 196 ap->a_dvp, ap->a_vpp, ap->a_cnp); 197 if (error) 198 return (error); 199 return (0); 200 } 201 202 /* 203 * Mknod vnode call 204 */ 205 /* ARGSUSED */ 206 static int 207 ufs_mknod(ap) 208 struct vop_mknod_args /* { 209 struct vnode *a_dvp; 210 struct vnode **a_vpp; 211 struct componentname *a_cnp; 212 struct vattr *a_vap; 213 } */ *ap; 214 { 215 struct vattr *vap = ap->a_vap; 216 struct vnode **vpp = ap->a_vpp; 217 struct inode *ip; 218 ino_t ino; 219 int error; 220 221 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 222 ap->a_dvp, vpp, ap->a_cnp); 223 if (error) 224 return (error); 225 ip = VTOI(*vpp); 226 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 227 if (vap->va_rdev != VNOVAL) { 228 /* 229 * Want to be able to use this to make badblock 230 * inodes, so don't truncate the dev number. 231 */ 232 DIP_SET(ip, i_rdev, vap->va_rdev); 233 } 234 /* 235 * Remove inode, then reload it through VFS_VGET so it is 236 * checked to see if it is an alias of an existing entry in 237 * the inode cache. XXX I don't believe this is necessary now. 238 */ 239 (*vpp)->v_type = VNON; 240 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 241 vgone(*vpp); 242 vput(*vpp); 243 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 244 if (error) { 245 *vpp = NULL; 246 return (error); 247 } 248 return (0); 249 } 250 251 /* 252 * Open called. 253 */ 254 /* ARGSUSED */ 255 static int 256 ufs_open(struct vop_open_args *ap) 257 { 258 struct vnode *vp = ap->a_vp; 259 struct inode *ip; 260 261 if (vp->v_type == VCHR || vp->v_type == VBLK) 262 return (EOPNOTSUPP); 263 264 ip = VTOI(vp); 265 /* 266 * Files marked append-only must be opened for appending. 267 */ 268 if ((ip->i_flags & APPEND) && 269 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 270 return (EPERM); 271 vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td); 272 return (0); 273 } 274 275 /* 276 * Close called. 277 * 278 * Update the times on the inode. 279 */ 280 /* ARGSUSED */ 281 static int 282 ufs_close(ap) 283 struct vop_close_args /* { 284 struct vnode *a_vp; 285 int a_fflag; 286 struct ucred *a_cred; 287 struct thread *a_td; 288 } */ *ap; 289 { 290 struct vnode *vp = ap->a_vp; 291 int usecount; 292 293 VI_LOCK(vp); 294 usecount = vp->v_usecount; 295 if (usecount > 1) 296 ufs_itimes_locked(vp); 297 VI_UNLOCK(vp); 298 return (0); 299 } 300 301 static int 302 ufs_access(ap) 303 struct vop_access_args /* { 304 struct vnode *a_vp; 305 int a_mode; 306 struct ucred *a_cred; 307 struct thread *a_td; 308 } */ *ap; 309 { 310 struct vnode *vp = ap->a_vp; 311 struct inode *ip = VTOI(vp); 312 mode_t mode = ap->a_mode; 313 int error; 314 #ifdef UFS_ACL 315 struct acl *acl; 316 #endif 317 318 /* 319 * Disallow write attempts on read-only filesystems; 320 * unless the file is a socket, fifo, or a block or 321 * character device resident on the filesystem. 322 */ 323 if (mode & VWRITE) { 324 switch (vp->v_type) { 325 case VDIR: 326 case VLNK: 327 case VREG: 328 if (vp->v_mount->mnt_flag & MNT_RDONLY) 329 return (EROFS); 330 break; 331 default: 332 break; 333 } 334 } 335 336 /* If immutable bit set, nobody gets to write it. */ 337 if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT))) 338 return (EPERM); 339 340 #ifdef UFS_ACL 341 if ((vp->v_mount->mnt_flag & MNT_ACLS) != 0) { 342 acl = uma_zalloc(acl_zone, M_WAITOK); 343 error = VOP_GETACL(vp, ACL_TYPE_ACCESS, acl, ap->a_cred, 344 ap->a_td); 345 switch (error) { 346 case EOPNOTSUPP: 347 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 348 ip->i_gid, ap->a_mode, ap->a_cred, NULL); 349 break; 350 case 0: 351 error = vaccess_acl_posix1e(vp->v_type, ip->i_uid, 352 ip->i_gid, acl, ap->a_mode, ap->a_cred, NULL); 353 break; 354 default: 355 printf( 356 "ufs_access(): Error retrieving ACL on object (%d).\n", 357 error); 358 /* 359 * XXX: Fall back until debugged. Should 360 * eventually possibly log an error, and return 361 * EPERM for safety. 362 */ 363 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 364 ip->i_gid, ap->a_mode, ap->a_cred, NULL); 365 } 366 uma_zfree(acl_zone, acl); 367 } else 368 #endif /* !UFS_ACL */ 369 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 370 ap->a_mode, ap->a_cred, NULL); 371 return (error); 372 } 373 374 /* ARGSUSED */ 375 static int 376 ufs_getattr(ap) 377 struct vop_getattr_args /* { 378 struct vnode *a_vp; 379 struct vattr *a_vap; 380 struct ucred *a_cred; 381 struct thread *a_td; 382 } */ *ap; 383 { 384 struct vnode *vp = ap->a_vp; 385 struct inode *ip = VTOI(vp); 386 struct vattr *vap = ap->a_vap; 387 388 VI_LOCK(vp); 389 ufs_itimes_locked(vp); 390 if (ip->i_ump->um_fstype == UFS1) { 391 vap->va_atime.tv_sec = ip->i_din1->di_atime; 392 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec; 393 } else { 394 vap->va_atime.tv_sec = ip->i_din2->di_atime; 395 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec; 396 } 397 VI_UNLOCK(vp); 398 /* 399 * Copy from inode table 400 */ 401 vap->va_fsid = dev2udev(ip->i_dev); 402 vap->va_fileid = ip->i_number; 403 vap->va_mode = ip->i_mode & ~IFMT; 404 vap->va_nlink = ip->i_effnlink; 405 vap->va_uid = ip->i_uid; 406 vap->va_gid = ip->i_gid; 407 if (ip->i_ump->um_fstype == UFS1) { 408 vap->va_rdev = ip->i_din1->di_rdev; 409 vap->va_size = ip->i_din1->di_size; 410 vap->va_mtime.tv_sec = ip->i_din1->di_mtime; 411 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec; 412 vap->va_ctime.tv_sec = ip->i_din1->di_ctime; 413 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec; 414 vap->va_birthtime.tv_sec = 0; 415 vap->va_birthtime.tv_nsec = 0; 416 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks); 417 } else { 418 vap->va_rdev = ip->i_din2->di_rdev; 419 vap->va_size = ip->i_din2->di_size; 420 vap->va_mtime.tv_sec = ip->i_din2->di_mtime; 421 vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec; 422 vap->va_ctime.tv_sec = ip->i_din2->di_ctime; 423 vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec; 424 vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime; 425 vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec; 426 vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks); 427 } 428 vap->va_flags = ip->i_flags; 429 vap->va_gen = ip->i_gen; 430 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 431 vap->va_type = IFTOVT(ip->i_mode); 432 vap->va_filerev = ip->i_modrev; 433 return (0); 434 } 435 436 /* 437 * Set attribute vnode op. called from several syscalls 438 */ 439 static int 440 ufs_setattr(ap) 441 struct vop_setattr_args /* { 442 struct vnode *a_vp; 443 struct vattr *a_vap; 444 struct ucred *a_cred; 445 struct thread *a_td; 446 } */ *ap; 447 { 448 struct vattr *vap = ap->a_vap; 449 struct vnode *vp = ap->a_vp; 450 struct inode *ip = VTOI(vp); 451 struct ucred *cred = ap->a_cred; 452 struct thread *td = ap->a_td; 453 int error; 454 455 /* 456 * Check for unsettable attributes. 457 */ 458 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 459 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 460 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 461 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 462 return (EINVAL); 463 } 464 /* 465 * Mark for update the file's access time for vfs_mark_atime(). 466 * We are doing this here to avoid some of the checks done 467 * below -- this operation is done by request of the kernel and 468 * should bypass some security checks. Things like read-only 469 * checks get handled by other levels (e.g., ffs_update()). 470 */ 471 if (vap->va_vaflags & VA_MARK_ATIME) { 472 ip->i_flag |= IN_ACCESS; 473 return (0); 474 } 475 if (vap->va_flags != VNOVAL) { 476 if (vp->v_mount->mnt_flag & MNT_RDONLY) 477 return (EROFS); 478 /* 479 * Callers may only modify the file flags on objects they 480 * have VADMIN rights for. 481 */ 482 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 483 return (error); 484 /* 485 * Unprivileged processes are not permitted to unset system 486 * flags, or modify flags if any system flags are set. 487 * Privileged non-jail processes may not modify system flags 488 * if securelevel > 0 and any existing system flags are set. 489 * Privileged jail processes behave like privileged non-jail 490 * processes if the security.jail.chflags_allowed sysctl is 491 * is non-zero; otherwise, they behave like unprivileged 492 * processes. 493 */ 494 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 495 if (ip->i_flags 496 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 497 error = securelevel_gt(cred, 0); 498 if (error) 499 return (error); 500 } 501 /* Snapshot flag cannot be set or cleared */ 502 if (((vap->va_flags & SF_SNAPSHOT) != 0 && 503 (ip->i_flags & SF_SNAPSHOT) == 0) || 504 ((vap->va_flags & SF_SNAPSHOT) == 0 && 505 (ip->i_flags & SF_SNAPSHOT) != 0)) 506 return (EPERM); 507 ip->i_flags = vap->va_flags; 508 DIP_SET(ip, i_flags, vap->va_flags); 509 } else { 510 if (ip->i_flags 511 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 512 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 513 return (EPERM); 514 ip->i_flags &= SF_SETTABLE; 515 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 516 DIP_SET(ip, i_flags, ip->i_flags); 517 } 518 ip->i_flag |= IN_CHANGE; 519 if (vap->va_flags & (IMMUTABLE | APPEND)) 520 return (0); 521 } 522 if (ip->i_flags & (IMMUTABLE | APPEND)) 523 return (EPERM); 524 /* 525 * Go through the fields and update iff not VNOVAL. 526 */ 527 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 528 if (vp->v_mount->mnt_flag & MNT_RDONLY) 529 return (EROFS); 530 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, 531 td)) != 0) 532 return (error); 533 } 534 if (vap->va_size != VNOVAL) { 535 /* 536 * XXX most of the following special cases should be in 537 * callers instead of in N filesystems. The VDIR check 538 * mostly already is. 539 */ 540 switch (vp->v_type) { 541 case VDIR: 542 return (EISDIR); 543 case VLNK: 544 case VREG: 545 /* 546 * Truncation should have an effect in these cases. 547 * Disallow it if the filesystem is read-only or 548 * the file is being snapshotted. 549 */ 550 if (vp->v_mount->mnt_flag & MNT_RDONLY) 551 return (EROFS); 552 if ((ip->i_flags & SF_SNAPSHOT) != 0) 553 return (EPERM); 554 break; 555 default: 556 /* 557 * According to POSIX, the result is unspecified 558 * for file types other than regular files, 559 * directories and shared memory objects. We 560 * don't support shared memory objects in the file 561 * system, and have dubious support for truncating 562 * symlinks. Just ignore the request in other cases. 563 */ 564 return (0); 565 } 566 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL, 567 cred, td)) != 0) 568 return (error); 569 } 570 if (vap->va_atime.tv_sec != VNOVAL || 571 vap->va_mtime.tv_sec != VNOVAL || 572 vap->va_birthtime.tv_sec != VNOVAL) { 573 if (vp->v_mount->mnt_flag & MNT_RDONLY) 574 return (EROFS); 575 if ((ip->i_flags & SF_SNAPSHOT) != 0) 576 return (EPERM); 577 /* 578 * From utimes(2): 579 * If times is NULL, ... The caller must be the owner of 580 * the file, have permission to write the file, or be the 581 * super-user. 582 * If times is non-NULL, ... The caller must be the owner of 583 * the file or be the super-user. 584 * 585 * Possibly for historical reasons, try to use VADMIN in 586 * preference to VWRITE for a NULL timestamp. This means we 587 * will return EACCES in preference to EPERM if neither 588 * check succeeds. 589 */ 590 if (vap->va_vaflags & VA_UTIMES_NULL) { 591 error = VOP_ACCESS(vp, VADMIN, cred, td); 592 if (error) 593 error = VOP_ACCESS(vp, VWRITE, cred, td); 594 } else 595 error = VOP_ACCESS(vp, VADMIN, cred, td); 596 if (error) 597 return (error); 598 if (vap->va_atime.tv_sec != VNOVAL) 599 ip->i_flag |= IN_ACCESS; 600 if (vap->va_mtime.tv_sec != VNOVAL) 601 ip->i_flag |= IN_CHANGE | IN_UPDATE; 602 if (vap->va_birthtime.tv_sec != VNOVAL && 603 ip->i_ump->um_fstype == UFS2) 604 ip->i_flag |= IN_MODIFIED; 605 ufs_itimes(vp); 606 if (vap->va_atime.tv_sec != VNOVAL) { 607 DIP_SET(ip, i_atime, vap->va_atime.tv_sec); 608 DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec); 609 } 610 if (vap->va_mtime.tv_sec != VNOVAL) { 611 DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec); 612 DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec); 613 } 614 if (vap->va_birthtime.tv_sec != VNOVAL && 615 ip->i_ump->um_fstype == UFS2) { 616 ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec; 617 ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec; 618 } 619 error = UFS_UPDATE(vp, 0); 620 if (error) 621 return (error); 622 } 623 error = 0; 624 if (vap->va_mode != (mode_t)VNOVAL) { 625 if (vp->v_mount->mnt_flag & MNT_RDONLY) 626 return (EROFS); 627 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode & 628 (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH))) 629 return (EPERM); 630 error = ufs_chmod(vp, (int)vap->va_mode, cred, td); 631 } 632 return (error); 633 } 634 635 /* 636 * Change the mode on a file. 637 * Inode must be locked before calling. 638 */ 639 static int 640 ufs_chmod(vp, mode, cred, td) 641 struct vnode *vp; 642 int mode; 643 struct ucred *cred; 644 struct thread *td; 645 { 646 struct inode *ip = VTOI(vp); 647 int error; 648 649 /* 650 * To modify the permissions on a file, must possess VADMIN 651 * for that file. 652 */ 653 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 654 return (error); 655 /* 656 * Privileged processes may set the sticky bit on non-directories, 657 * as well as set the setgid bit on a file with a group that the 658 * process is not a member of. Both of these are allowed in 659 * jail(8). 660 */ 661 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 662 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0)) 663 return (EFTYPE); 664 } 665 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 666 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 667 if (error) 668 return (error); 669 } 670 ip->i_mode &= ~ALLPERMS; 671 ip->i_mode |= (mode & ALLPERMS); 672 DIP_SET(ip, i_mode, ip->i_mode); 673 ip->i_flag |= IN_CHANGE; 674 return (0); 675 } 676 677 /* 678 * Perform chown operation on inode ip; 679 * inode must be locked prior to call. 680 */ 681 static int 682 ufs_chown(vp, uid, gid, cred, td) 683 struct vnode *vp; 684 uid_t uid; 685 gid_t gid; 686 struct ucred *cred; 687 struct thread *td; 688 { 689 struct inode *ip = VTOI(vp); 690 uid_t ouid; 691 gid_t ogid; 692 int error = 0; 693 #ifdef QUOTA 694 int i; 695 ufs2_daddr_t change; 696 #endif 697 698 if (uid == (uid_t)VNOVAL) 699 uid = ip->i_uid; 700 if (gid == (gid_t)VNOVAL) 701 gid = ip->i_gid; 702 /* 703 * To modify the ownership of a file, must possess VADMIN for that 704 * file. 705 */ 706 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 707 return (error); 708 /* 709 * To change the owner of a file, or change the group of a file to a 710 * group of which we are not a member, the caller must have 711 * privilege. 712 */ 713 if ((uid != ip->i_uid || 714 (gid != ip->i_gid && !groupmember(gid, cred))) && 715 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0))) 716 return (error); 717 ogid = ip->i_gid; 718 ouid = ip->i_uid; 719 #ifdef QUOTA 720 if ((error = getinoquota(ip)) != 0) 721 return (error); 722 if (ouid == uid) { 723 dqrele(vp, ip->i_dquot[USRQUOTA]); 724 ip->i_dquot[USRQUOTA] = NODQUOT; 725 } 726 if (ogid == gid) { 727 dqrele(vp, ip->i_dquot[GRPQUOTA]); 728 ip->i_dquot[GRPQUOTA] = NODQUOT; 729 } 730 change = DIP(ip, i_blocks); 731 (void) chkdq(ip, -change, cred, CHOWN); 732 (void) chkiq(ip, -1, cred, CHOWN); 733 for (i = 0; i < MAXQUOTAS; i++) { 734 dqrele(vp, ip->i_dquot[i]); 735 ip->i_dquot[i] = NODQUOT; 736 } 737 #endif 738 ip->i_gid = gid; 739 DIP_SET(ip, i_gid, gid); 740 ip->i_uid = uid; 741 DIP_SET(ip, i_uid, uid); 742 #ifdef QUOTA 743 if ((error = getinoquota(ip)) == 0) { 744 if (ouid == uid) { 745 dqrele(vp, ip->i_dquot[USRQUOTA]); 746 ip->i_dquot[USRQUOTA] = NODQUOT; 747 } 748 if (ogid == gid) { 749 dqrele(vp, ip->i_dquot[GRPQUOTA]); 750 ip->i_dquot[GRPQUOTA] = NODQUOT; 751 } 752 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 753 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 754 goto good; 755 else 756 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 757 } 758 for (i = 0; i < MAXQUOTAS; i++) { 759 dqrele(vp, ip->i_dquot[i]); 760 ip->i_dquot[i] = NODQUOT; 761 } 762 } 763 ip->i_gid = ogid; 764 DIP_SET(ip, i_gid, ogid); 765 ip->i_uid = ouid; 766 DIP_SET(ip, i_uid, ouid); 767 if (getinoquota(ip) == 0) { 768 if (ouid == uid) { 769 dqrele(vp, ip->i_dquot[USRQUOTA]); 770 ip->i_dquot[USRQUOTA] = NODQUOT; 771 } 772 if (ogid == gid) { 773 dqrele(vp, ip->i_dquot[GRPQUOTA]); 774 ip->i_dquot[GRPQUOTA] = NODQUOT; 775 } 776 (void) chkdq(ip, change, cred, FORCE|CHOWN); 777 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 778 (void) getinoquota(ip); 779 } 780 return (error); 781 good: 782 if (getinoquota(ip)) 783 panic("ufs_chown: lost quota"); 784 #endif /* QUOTA */ 785 ip->i_flag |= IN_CHANGE; 786 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 787 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) { 788 ip->i_mode &= ~(ISUID | ISGID); 789 DIP_SET(ip, i_mode, ip->i_mode); 790 } 791 } 792 return (0); 793 } 794 795 static int 796 ufs_remove(ap) 797 struct vop_remove_args /* { 798 struct vnode *a_dvp; 799 struct vnode *a_vp; 800 struct componentname *a_cnp; 801 } */ *ap; 802 { 803 struct inode *ip; 804 struct vnode *vp = ap->a_vp; 805 struct vnode *dvp = ap->a_dvp; 806 int error; 807 struct thread *td; 808 809 td = curthread; 810 ip = VTOI(vp); 811 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 812 (VTOI(dvp)->i_flags & APPEND)) { 813 error = EPERM; 814 goto out; 815 } 816 #ifdef UFS_GJOURNAL 817 ufs_gjournal_orphan(vp); 818 #endif 819 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 820 if (ip->i_nlink <= 0) 821 vp->v_vflag |= VV_NOSYNC; 822 if ((ip->i_flags & SF_SNAPSHOT) != 0) { 823 /* 824 * Avoid deadlock where another thread is trying to 825 * update the inodeblock for dvp and is waiting on 826 * snaplk. Temporary unlock the vnode lock for the 827 * unlinked file and sync the directory. This should 828 * allow vput() of the directory to not block later on 829 * while holding the snapshot vnode locked, assuming 830 * that the directory hasn't been unlinked too. 831 */ 832 VOP_UNLOCK(vp, 0, td); 833 (void) VOP_FSYNC(dvp, MNT_WAIT, td); 834 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 835 } 836 out: 837 return (error); 838 } 839 840 /* 841 * link vnode call 842 */ 843 static int 844 ufs_link(ap) 845 struct vop_link_args /* { 846 struct vnode *a_tdvp; 847 struct vnode *a_vp; 848 struct componentname *a_cnp; 849 } */ *ap; 850 { 851 struct vnode *vp = ap->a_vp; 852 struct vnode *tdvp = ap->a_tdvp; 853 struct componentname *cnp = ap->a_cnp; 854 struct inode *ip; 855 struct direct newdir; 856 int error; 857 858 #ifdef DIAGNOSTIC 859 if ((cnp->cn_flags & HASBUF) == 0) 860 panic("ufs_link: no name"); 861 #endif 862 if (tdvp->v_mount != vp->v_mount) { 863 error = EXDEV; 864 goto out; 865 } 866 ip = VTOI(vp); 867 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 868 error = EMLINK; 869 goto out; 870 } 871 if (ip->i_flags & (IMMUTABLE | APPEND)) { 872 error = EPERM; 873 goto out; 874 } 875 ip->i_effnlink++; 876 ip->i_nlink++; 877 DIP_SET(ip, i_nlink, ip->i_nlink); 878 ip->i_flag |= IN_CHANGE; 879 if (DOINGSOFTDEP(vp)) 880 softdep_change_linkcnt(ip); 881 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 882 if (!error) { 883 ufs_makedirentry(ip, cnp, &newdir); 884 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 885 } 886 887 if (error) { 888 ip->i_effnlink--; 889 ip->i_nlink--; 890 DIP_SET(ip, i_nlink, ip->i_nlink); 891 ip->i_flag |= IN_CHANGE; 892 if (DOINGSOFTDEP(vp)) 893 softdep_change_linkcnt(ip); 894 } 895 out: 896 return (error); 897 } 898 899 /* 900 * whiteout vnode call 901 */ 902 static int 903 ufs_whiteout(ap) 904 struct vop_whiteout_args /* { 905 struct vnode *a_dvp; 906 struct componentname *a_cnp; 907 int a_flags; 908 } */ *ap; 909 { 910 struct vnode *dvp = ap->a_dvp; 911 struct componentname *cnp = ap->a_cnp; 912 struct direct newdir; 913 int error = 0; 914 915 switch (ap->a_flags) { 916 case LOOKUP: 917 /* 4.4 format directories support whiteout operations */ 918 if (dvp->v_mount->mnt_maxsymlinklen > 0) 919 return (0); 920 return (EOPNOTSUPP); 921 922 case CREATE: 923 /* create a new directory whiteout */ 924 #ifdef DIAGNOSTIC 925 if ((cnp->cn_flags & SAVENAME) == 0) 926 panic("ufs_whiteout: missing name"); 927 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 928 panic("ufs_whiteout: old format filesystem"); 929 #endif 930 931 newdir.d_ino = WINO; 932 newdir.d_namlen = cnp->cn_namelen; 933 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 934 newdir.d_type = DT_WHT; 935 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 936 break; 937 938 case DELETE: 939 /* remove an existing directory whiteout */ 940 #ifdef DIAGNOSTIC 941 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 942 panic("ufs_whiteout: old format filesystem"); 943 #endif 944 945 cnp->cn_flags &= ~DOWHITEOUT; 946 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 947 break; 948 default: 949 panic("ufs_whiteout: unknown op"); 950 } 951 return (error); 952 } 953 954 /* 955 * Rename system call. 956 * rename("foo", "bar"); 957 * is essentially 958 * unlink("bar"); 959 * link("foo", "bar"); 960 * unlink("foo"); 961 * but ``atomically''. Can't do full commit without saving state in the 962 * inode on disk which isn't feasible at this time. Best we can do is 963 * always guarantee the target exists. 964 * 965 * Basic algorithm is: 966 * 967 * 1) Bump link count on source while we're linking it to the 968 * target. This also ensure the inode won't be deleted out 969 * from underneath us while we work (it may be truncated by 970 * a concurrent `trunc' or `open' for creation). 971 * 2) Link source to destination. If destination already exists, 972 * delete it first. 973 * 3) Unlink source reference to inode if still around. If a 974 * directory was moved and the parent of the destination 975 * is different from the source, patch the ".." entry in the 976 * directory. 977 */ 978 static int 979 ufs_rename(ap) 980 struct vop_rename_args /* { 981 struct vnode *a_fdvp; 982 struct vnode *a_fvp; 983 struct componentname *a_fcnp; 984 struct vnode *a_tdvp; 985 struct vnode *a_tvp; 986 struct componentname *a_tcnp; 987 } */ *ap; 988 { 989 struct vnode *tvp = ap->a_tvp; 990 struct vnode *tdvp = ap->a_tdvp; 991 struct vnode *fvp = ap->a_fvp; 992 struct vnode *fdvp = ap->a_fdvp; 993 struct componentname *tcnp = ap->a_tcnp; 994 struct componentname *fcnp = ap->a_fcnp; 995 struct thread *td = fcnp->cn_thread; 996 struct inode *ip, *xp, *dp; 997 struct direct newdir; 998 int doingdirectory = 0, oldparent = 0, newparent = 0; 999 int error = 0, ioflag; 1000 1001 #ifdef DIAGNOSTIC 1002 if ((tcnp->cn_flags & HASBUF) == 0 || 1003 (fcnp->cn_flags & HASBUF) == 0) 1004 panic("ufs_rename: no name"); 1005 #endif 1006 /* 1007 * Check for cross-device rename. 1008 */ 1009 if ((fvp->v_mount != tdvp->v_mount) || 1010 (tvp && (fvp->v_mount != tvp->v_mount))) { 1011 error = EXDEV; 1012 abortit: 1013 if (tdvp == tvp) 1014 vrele(tdvp); 1015 else 1016 vput(tdvp); 1017 if (tvp) 1018 vput(tvp); 1019 vrele(fdvp); 1020 vrele(fvp); 1021 return (error); 1022 } 1023 1024 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1025 (VTOI(tdvp)->i_flags & APPEND))) { 1026 error = EPERM; 1027 goto abortit; 1028 } 1029 1030 /* 1031 * Renaming a file to itself has no effect. The upper layers should 1032 * not call us in that case. Temporarily just warn if they do. 1033 */ 1034 if (fvp == tvp) { 1035 printf("ufs_rename: fvp == tvp (can't happen)\n"); 1036 error = 0; 1037 goto abortit; 1038 } 1039 1040 if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0) 1041 goto abortit; 1042 dp = VTOI(fdvp); 1043 ip = VTOI(fvp); 1044 if (ip->i_nlink >= LINK_MAX) { 1045 VOP_UNLOCK(fvp, 0, td); 1046 error = EMLINK; 1047 goto abortit; 1048 } 1049 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1050 || (dp->i_flags & APPEND)) { 1051 VOP_UNLOCK(fvp, 0, td); 1052 error = EPERM; 1053 goto abortit; 1054 } 1055 if ((ip->i_mode & IFMT) == IFDIR) { 1056 /* 1057 * Avoid ".", "..", and aliases of "." for obvious reasons. 1058 */ 1059 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1060 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 1061 (ip->i_flag & IN_RENAME)) { 1062 VOP_UNLOCK(fvp, 0, td); 1063 error = EINVAL; 1064 goto abortit; 1065 } 1066 ip->i_flag |= IN_RENAME; 1067 oldparent = dp->i_number; 1068 doingdirectory = 1; 1069 } 1070 vrele(fdvp); 1071 1072 /* 1073 * When the target exists, both the directory 1074 * and target vnodes are returned locked. 1075 */ 1076 dp = VTOI(tdvp); 1077 xp = NULL; 1078 if (tvp) 1079 xp = VTOI(tvp); 1080 1081 /* 1082 * 1) Bump link count while we're moving stuff 1083 * around. If we crash somewhere before 1084 * completing our work, the link count 1085 * may be wrong, but correctable. 1086 */ 1087 ip->i_effnlink++; 1088 ip->i_nlink++; 1089 DIP_SET(ip, i_nlink, ip->i_nlink); 1090 ip->i_flag |= IN_CHANGE; 1091 if (DOINGSOFTDEP(fvp)) 1092 softdep_change_linkcnt(ip); 1093 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 1094 DOINGASYNC(fvp)))) != 0) { 1095 VOP_UNLOCK(fvp, 0, td); 1096 goto bad; 1097 } 1098 1099 /* 1100 * If ".." must be changed (ie the directory gets a new 1101 * parent) then the source directory must not be in the 1102 * directory hierarchy above the target, as this would 1103 * orphan everything below the source directory. Also 1104 * the user must have write permission in the source so 1105 * as to be able to change "..". We must repeat the call 1106 * to namei, as the parent directory is unlocked by the 1107 * call to checkpath(). 1108 */ 1109 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1110 VOP_UNLOCK(fvp, 0, td); 1111 if (oldparent != dp->i_number) 1112 newparent = dp->i_number; 1113 if (doingdirectory && newparent) { 1114 if (error) /* write access check above */ 1115 goto bad; 1116 if (xp != NULL) 1117 vput(tvp); 1118 error = ufs_checkpath(ip, dp, tcnp->cn_cred); 1119 if (error) 1120 goto out; 1121 if ((tcnp->cn_flags & SAVESTART) == 0) 1122 panic("ufs_rename: lost to startdir"); 1123 VREF(tdvp); 1124 error = relookup(tdvp, &tvp, tcnp); 1125 if (error) 1126 goto out; 1127 vrele(tdvp); 1128 dp = VTOI(tdvp); 1129 xp = NULL; 1130 if (tvp) 1131 xp = VTOI(tvp); 1132 } 1133 /* 1134 * 2) If target doesn't exist, link the target 1135 * to the source and unlink the source. 1136 * Otherwise, rewrite the target directory 1137 * entry to reference the source inode and 1138 * expunge the original entry's existence. 1139 */ 1140 if (xp == NULL) { 1141 if (dp->i_dev != ip->i_dev) 1142 panic("ufs_rename: EXDEV"); 1143 /* 1144 * Account for ".." in new directory. 1145 * When source and destination have the same 1146 * parent we don't fool with the link count. 1147 */ 1148 if (doingdirectory && newparent) { 1149 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1150 error = EMLINK; 1151 goto bad; 1152 } 1153 dp->i_effnlink++; 1154 dp->i_nlink++; 1155 DIP_SET(dp, i_nlink, dp->i_nlink); 1156 dp->i_flag |= IN_CHANGE; 1157 if (DOINGSOFTDEP(tdvp)) 1158 softdep_change_linkcnt(dp); 1159 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1160 DOINGASYNC(tdvp))); 1161 if (error) 1162 goto bad; 1163 } 1164 ufs_makedirentry(ip, tcnp, &newdir); 1165 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1166 if (error) { 1167 if (doingdirectory && newparent) { 1168 dp->i_effnlink--; 1169 dp->i_nlink--; 1170 DIP_SET(dp, i_nlink, dp->i_nlink); 1171 dp->i_flag |= IN_CHANGE; 1172 if (DOINGSOFTDEP(tdvp)) 1173 softdep_change_linkcnt(dp); 1174 (void)UFS_UPDATE(tdvp, 1); 1175 } 1176 goto bad; 1177 } 1178 vput(tdvp); 1179 } else { 1180 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1181 panic("ufs_rename: EXDEV"); 1182 /* 1183 * Short circuit rename(foo, foo). 1184 */ 1185 if (xp->i_number == ip->i_number) 1186 panic("ufs_rename: same file"); 1187 /* 1188 * If the parent directory is "sticky", then the caller 1189 * must possess VADMIN for the parent directory, or the 1190 * destination of the rename. This implements append-only 1191 * directories. 1192 */ 1193 if ((dp->i_mode & S_ISTXT) && 1194 VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) && 1195 VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) { 1196 error = EPERM; 1197 goto bad; 1198 } 1199 /* 1200 * Target must be empty if a directory and have no links 1201 * to it. Also, ensure source and target are compatible 1202 * (both directories, or both not directories). 1203 */ 1204 if ((xp->i_mode&IFMT) == IFDIR) { 1205 if ((xp->i_effnlink > 2) || 1206 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1207 error = ENOTEMPTY; 1208 goto bad; 1209 } 1210 if (!doingdirectory) { 1211 error = ENOTDIR; 1212 goto bad; 1213 } 1214 cache_purge(tdvp); 1215 } else if (doingdirectory) { 1216 error = EISDIR; 1217 goto bad; 1218 } 1219 error = ufs_dirrewrite(dp, xp, ip->i_number, 1220 IFTODT(ip->i_mode), 1221 (doingdirectory && newparent) ? newparent : doingdirectory); 1222 if (error) 1223 goto bad; 1224 if (doingdirectory) { 1225 if (!newparent) { 1226 dp->i_effnlink--; 1227 if (DOINGSOFTDEP(tdvp)) 1228 softdep_change_linkcnt(dp); 1229 } 1230 xp->i_effnlink--; 1231 if (DOINGSOFTDEP(tvp)) 1232 softdep_change_linkcnt(xp); 1233 } 1234 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1235 /* 1236 * Truncate inode. The only stuff left in the directory 1237 * is "." and "..". The "." reference is inconsequential 1238 * since we are quashing it. We have removed the "." 1239 * reference and the reference in the parent directory, 1240 * but there may be other hard links. The soft 1241 * dependency code will arrange to do these operations 1242 * after the parent directory entry has been deleted on 1243 * disk, so when running with that code we avoid doing 1244 * them now. 1245 */ 1246 if (!newparent) { 1247 dp->i_nlink--; 1248 DIP_SET(dp, i_nlink, dp->i_nlink); 1249 dp->i_flag |= IN_CHANGE; 1250 } 1251 xp->i_nlink--; 1252 DIP_SET(xp, i_nlink, xp->i_nlink); 1253 xp->i_flag |= IN_CHANGE; 1254 ioflag = IO_NORMAL; 1255 if (!DOINGASYNC(tvp)) 1256 ioflag |= IO_SYNC; 1257 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1258 tcnp->cn_cred, tcnp->cn_thread)) != 0) 1259 goto bad; 1260 } 1261 vput(tdvp); 1262 vput(tvp); 1263 xp = NULL; 1264 } 1265 1266 /* 1267 * 3) Unlink the source. 1268 */ 1269 fcnp->cn_flags &= ~MODMASK; 1270 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1271 if ((fcnp->cn_flags & SAVESTART) == 0) 1272 panic("ufs_rename: lost from startdir"); 1273 VREF(fdvp); 1274 error = relookup(fdvp, &fvp, fcnp); 1275 if (error == 0) 1276 vrele(fdvp); 1277 if (fvp != NULL) { 1278 xp = VTOI(fvp); 1279 dp = VTOI(fdvp); 1280 } else { 1281 /* 1282 * From name has disappeared. IN_RENAME is not sufficient 1283 * to protect against directory races due to timing windows, 1284 * so we have to remove the panic. XXX the only real way 1285 * to solve this issue is at a much higher level. By the 1286 * time we hit ufs_rename() it's too late. 1287 */ 1288 #if 0 1289 if (doingdirectory) 1290 panic("ufs_rename: lost dir entry"); 1291 #endif 1292 vrele(ap->a_fvp); 1293 return (0); 1294 } 1295 /* 1296 * Ensure that the directory entry still exists and has not 1297 * changed while the new name has been entered. If the source is 1298 * a file then the entry may have been unlinked or renamed. In 1299 * either case there is no further work to be done. If the source 1300 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1301 * flag ensures that it cannot be moved by another rename or removed 1302 * by a rmdir. 1303 */ 1304 if (xp != ip) { 1305 /* 1306 * From name resolves to a different inode. IN_RENAME is 1307 * not sufficient protection against timing window races 1308 * so we can't panic here. XXX the only real way 1309 * to solve this issue is at a much higher level. By the 1310 * time we hit ufs_rename() it's too late. 1311 */ 1312 #if 0 1313 if (doingdirectory) 1314 panic("ufs_rename: lost dir entry"); 1315 #endif 1316 } else { 1317 /* 1318 * If the source is a directory with a 1319 * new parent, the link count of the old 1320 * parent directory must be decremented 1321 * and ".." set to point to the new parent. 1322 */ 1323 if (doingdirectory && newparent) { 1324 xp->i_offset = mastertemplate.dot_reclen; 1325 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1326 cache_purge(fdvp); 1327 } 1328 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1329 xp->i_flag &= ~IN_RENAME; 1330 } 1331 if (dp) 1332 vput(fdvp); 1333 if (xp) 1334 vput(fvp); 1335 vrele(ap->a_fvp); 1336 return (error); 1337 1338 bad: 1339 if (xp) 1340 vput(ITOV(xp)); 1341 vput(ITOV(dp)); 1342 out: 1343 if (doingdirectory) 1344 ip->i_flag &= ~IN_RENAME; 1345 if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) { 1346 ip->i_effnlink--; 1347 ip->i_nlink--; 1348 DIP_SET(ip, i_nlink, ip->i_nlink); 1349 ip->i_flag |= IN_CHANGE; 1350 ip->i_flag &= ~IN_RENAME; 1351 if (DOINGSOFTDEP(fvp)) 1352 softdep_change_linkcnt(ip); 1353 vput(fvp); 1354 } else 1355 vrele(fvp); 1356 return (error); 1357 } 1358 1359 /* 1360 * Mkdir system call 1361 */ 1362 static int 1363 ufs_mkdir(ap) 1364 struct vop_mkdir_args /* { 1365 struct vnode *a_dvp; 1366 struct vnode **a_vpp; 1367 struct componentname *a_cnp; 1368 struct vattr *a_vap; 1369 } */ *ap; 1370 { 1371 struct vnode *dvp = ap->a_dvp; 1372 struct vattr *vap = ap->a_vap; 1373 struct componentname *cnp = ap->a_cnp; 1374 struct inode *ip, *dp; 1375 struct vnode *tvp; 1376 struct buf *bp; 1377 struct dirtemplate dirtemplate, *dtp; 1378 struct direct newdir; 1379 #ifdef UFS_ACL 1380 struct acl *acl, *dacl; 1381 #endif 1382 int error, dmode; 1383 long blkoff; 1384 1385 #ifdef DIAGNOSTIC 1386 if ((cnp->cn_flags & HASBUF) == 0) 1387 panic("ufs_mkdir: no name"); 1388 #endif 1389 dp = VTOI(dvp); 1390 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1391 error = EMLINK; 1392 goto out; 1393 } 1394 dmode = vap->va_mode & 0777; 1395 dmode |= IFDIR; 1396 /* 1397 * Must simulate part of ufs_makeinode here to acquire the inode, 1398 * but not have it entered in the parent directory. The entry is 1399 * made later after writing "." and ".." entries. 1400 */ 1401 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1402 if (error) 1403 goto out; 1404 ip = VTOI(tvp); 1405 ip->i_gid = dp->i_gid; 1406 DIP_SET(ip, i_gid, dp->i_gid); 1407 #ifdef SUIDDIR 1408 { 1409 #ifdef QUOTA 1410 struct ucred ucred, *ucp; 1411 ucp = cnp->cn_cred; 1412 #endif 1413 /* 1414 * If we are hacking owners here, (only do this where told to) 1415 * and we are not giving it TO root, (would subvert quotas) 1416 * then go ahead and give it to the other user. 1417 * The new directory also inherits the SUID bit. 1418 * If user's UID and dir UID are the same, 1419 * 'give it away' so that the SUID is still forced on. 1420 */ 1421 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1422 (dp->i_mode & ISUID) && dp->i_uid) { 1423 dmode |= ISUID; 1424 ip->i_uid = dp->i_uid; 1425 DIP_SET(ip, i_uid, dp->i_uid); 1426 #ifdef QUOTA 1427 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1428 /* 1429 * Make sure the correct user gets charged 1430 * for the space. 1431 * Make a dummy credential for the victim. 1432 * XXX This seems to never be accessed out of 1433 * our context so a stack variable is ok. 1434 */ 1435 refcount_init(&ucred.cr_ref, 1); 1436 ucred.cr_uid = ip->i_uid; 1437 ucred.cr_ngroups = 1; 1438 ucred.cr_groups[0] = dp->i_gid; 1439 ucp = &ucred; 1440 } 1441 #endif 1442 } else { 1443 ip->i_uid = cnp->cn_cred->cr_uid; 1444 DIP_SET(ip, i_uid, ip->i_uid); 1445 } 1446 #ifdef QUOTA 1447 if ((error = getinoquota(ip)) || 1448 (error = chkiq(ip, 1, ucp, 0))) { 1449 UFS_VFREE(tvp, ip->i_number, dmode); 1450 vput(tvp); 1451 return (error); 1452 } 1453 #endif 1454 } 1455 #else /* !SUIDDIR */ 1456 ip->i_uid = cnp->cn_cred->cr_uid; 1457 DIP_SET(ip, i_uid, ip->i_uid); 1458 #ifdef QUOTA 1459 if ((error = getinoquota(ip)) || 1460 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1461 UFS_VFREE(tvp, ip->i_number, dmode); 1462 vput(tvp); 1463 return (error); 1464 } 1465 #endif 1466 #endif /* !SUIDDIR */ 1467 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1468 #ifdef UFS_ACL 1469 acl = dacl = NULL; 1470 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 1471 acl = uma_zalloc(acl_zone, M_WAITOK); 1472 dacl = uma_zalloc(acl_zone, M_WAITOK); 1473 1474 /* 1475 * Retrieve default ACL from parent, if any. 1476 */ 1477 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 1478 cnp->cn_thread); 1479 switch (error) { 1480 case 0: 1481 /* 1482 * Retrieved a default ACL, so merge mode and ACL if 1483 * necessary. If the ACL is empty, fall through to 1484 * the "not defined or available" case. 1485 */ 1486 if (acl->acl_cnt != 0) { 1487 dmode = acl_posix1e_newfilemode(dmode, acl); 1488 ip->i_mode = dmode; 1489 DIP_SET(ip, i_mode, dmode); 1490 *dacl = *acl; 1491 ufs_sync_acl_from_inode(ip, acl); 1492 break; 1493 } 1494 /* FALLTHROUGH */ 1495 1496 case EOPNOTSUPP: 1497 /* 1498 * Just use the mode as-is. 1499 */ 1500 ip->i_mode = dmode; 1501 DIP_SET(ip, i_mode, dmode); 1502 uma_zfree(acl_zone, acl); 1503 uma_zfree(acl_zone, dacl); 1504 dacl = acl = NULL; 1505 break; 1506 1507 default: 1508 UFS_VFREE(tvp, ip->i_number, dmode); 1509 vput(tvp); 1510 uma_zfree(acl_zone, acl); 1511 uma_zfree(acl_zone, dacl); 1512 return (error); 1513 } 1514 } else { 1515 #endif /* !UFS_ACL */ 1516 ip->i_mode = dmode; 1517 DIP_SET(ip, i_mode, dmode); 1518 #ifdef UFS_ACL 1519 } 1520 #endif 1521 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1522 ip->i_effnlink = 2; 1523 ip->i_nlink = 2; 1524 DIP_SET(ip, i_nlink, 2); 1525 if (DOINGSOFTDEP(tvp)) 1526 softdep_change_linkcnt(ip); 1527 if (cnp->cn_flags & ISWHITEOUT) { 1528 ip->i_flags |= UF_OPAQUE; 1529 DIP_SET(ip, i_flags, ip->i_flags); 1530 } 1531 1532 /* 1533 * Bump link count in parent directory to reflect work done below. 1534 * Should be done before reference is created so cleanup is 1535 * possible if we crash. 1536 */ 1537 dp->i_effnlink++; 1538 dp->i_nlink++; 1539 DIP_SET(dp, i_nlink, dp->i_nlink); 1540 dp->i_flag |= IN_CHANGE; 1541 if (DOINGSOFTDEP(dvp)) 1542 softdep_change_linkcnt(dp); 1543 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1544 if (error) 1545 goto bad; 1546 #ifdef MAC 1547 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 1548 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 1549 dvp, tvp, cnp); 1550 if (error) 1551 goto bad; 1552 } 1553 #endif 1554 #ifdef UFS_ACL 1555 if (acl != NULL) { 1556 /* 1557 * XXX: If we abort now, will Soft Updates notify the extattr 1558 * code that the EAs for the file need to be released? 1559 */ 1560 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 1561 cnp->cn_thread); 1562 if (error == 0) 1563 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, 1564 cnp->cn_cred, cnp->cn_thread); 1565 switch (error) { 1566 case 0: 1567 break; 1568 1569 case EOPNOTSUPP: 1570 /* 1571 * XXX: This should not happen, as EOPNOTSUPP above 1572 * was supposed to free acl. 1573 */ 1574 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1575 /* 1576 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()"); 1577 */ 1578 break; 1579 1580 default: 1581 uma_zfree(acl_zone, acl); 1582 uma_zfree(acl_zone, dacl); 1583 dacl = acl = NULL; 1584 goto bad; 1585 } 1586 uma_zfree(acl_zone, acl); 1587 uma_zfree(acl_zone, dacl); 1588 dacl = acl = NULL; 1589 } 1590 #endif /* !UFS_ACL */ 1591 1592 /* 1593 * Initialize directory with "." and ".." from static template. 1594 */ 1595 if (dvp->v_mount->mnt_maxsymlinklen > 0) 1596 dtp = &mastertemplate; 1597 else 1598 dtp = (struct dirtemplate *)&omastertemplate; 1599 dirtemplate = *dtp; 1600 dirtemplate.dot_ino = ip->i_number; 1601 dirtemplate.dotdot_ino = dp->i_number; 1602 if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1603 BA_CLRBUF, &bp)) != 0) 1604 goto bad; 1605 ip->i_size = DIRBLKSIZ; 1606 DIP_SET(ip, i_size, DIRBLKSIZ); 1607 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1608 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1609 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1610 if (DOINGSOFTDEP(tvp)) { 1611 /* 1612 * Ensure that the entire newly allocated block is a 1613 * valid directory so that future growth within the 1614 * block does not have to ensure that the block is 1615 * written before the inode. 1616 */ 1617 blkoff = DIRBLKSIZ; 1618 while (blkoff < bp->b_bcount) { 1619 ((struct direct *) 1620 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1621 blkoff += DIRBLKSIZ; 1622 } 1623 } 1624 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1625 DOINGASYNC(tvp)))) != 0) { 1626 (void)bwrite(bp); 1627 goto bad; 1628 } 1629 /* 1630 * Directory set up, now install its entry in the parent directory. 1631 * 1632 * If we are not doing soft dependencies, then we must write out the 1633 * buffer containing the new directory body before entering the new 1634 * name in the parent. If we are doing soft dependencies, then the 1635 * buffer containing the new directory body will be passed to and 1636 * released in the soft dependency code after the code has attached 1637 * an appropriate ordering dependency to the buffer which ensures that 1638 * the buffer is written before the new name is written in the parent. 1639 */ 1640 if (DOINGASYNC(dvp)) 1641 bdwrite(bp); 1642 else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp)))) 1643 goto bad; 1644 ufs_makedirentry(ip, cnp, &newdir); 1645 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1646 1647 bad: 1648 if (error == 0) { 1649 *ap->a_vpp = tvp; 1650 } else { 1651 #ifdef UFS_ACL 1652 if (acl != NULL) 1653 uma_zfree(acl_zone, acl); 1654 if (dacl != NULL) 1655 uma_zfree(acl_zone, dacl); 1656 #endif 1657 dp->i_effnlink--; 1658 dp->i_nlink--; 1659 DIP_SET(dp, i_nlink, dp->i_nlink); 1660 dp->i_flag |= IN_CHANGE; 1661 if (DOINGSOFTDEP(dvp)) 1662 softdep_change_linkcnt(dp); 1663 /* 1664 * No need to do an explicit VOP_TRUNCATE here, vrele will 1665 * do this for us because we set the link count to 0. 1666 */ 1667 ip->i_effnlink = 0; 1668 ip->i_nlink = 0; 1669 DIP_SET(ip, i_nlink, 0); 1670 ip->i_flag |= IN_CHANGE; 1671 if (DOINGSOFTDEP(tvp)) 1672 softdep_change_linkcnt(ip); 1673 vput(tvp); 1674 } 1675 out: 1676 return (error); 1677 } 1678 1679 /* 1680 * Rmdir system call. 1681 */ 1682 static int 1683 ufs_rmdir(ap) 1684 struct vop_rmdir_args /* { 1685 struct vnode *a_dvp; 1686 struct vnode *a_vp; 1687 struct componentname *a_cnp; 1688 } */ *ap; 1689 { 1690 struct vnode *vp = ap->a_vp; 1691 struct vnode *dvp = ap->a_dvp; 1692 struct componentname *cnp = ap->a_cnp; 1693 struct inode *ip, *dp; 1694 int error, ioflag; 1695 1696 ip = VTOI(vp); 1697 dp = VTOI(dvp); 1698 1699 /* 1700 * Do not remove a directory that is in the process of being renamed. 1701 * Verify the directory is empty (and valid). Rmdir ".." will not be 1702 * valid since ".." will contain a reference to the current directory 1703 * and thus be non-empty. Do not allow the removal of mounted on 1704 * directories (this can happen when an NFS exported filesystem 1705 * tries to remove a locally mounted on directory). 1706 */ 1707 error = 0; 1708 if ((ip->i_flag & IN_RENAME) || ip->i_effnlink < 2) { 1709 error = EINVAL; 1710 goto out; 1711 } 1712 if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1713 error = ENOTEMPTY; 1714 goto out; 1715 } 1716 if ((dp->i_flags & APPEND) 1717 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1718 error = EPERM; 1719 goto out; 1720 } 1721 if (vp->v_mountedhere != 0) { 1722 error = EINVAL; 1723 goto out; 1724 } 1725 #ifdef UFS_GJOURNAL 1726 ufs_gjournal_orphan(vp); 1727 #endif 1728 /* 1729 * Delete reference to directory before purging 1730 * inode. If we crash in between, the directory 1731 * will be reattached to lost+found, 1732 */ 1733 dp->i_effnlink--; 1734 ip->i_effnlink--; 1735 if (DOINGSOFTDEP(vp)) { 1736 softdep_change_linkcnt(dp); 1737 softdep_change_linkcnt(ip); 1738 } 1739 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1740 if (error) { 1741 dp->i_effnlink++; 1742 ip->i_effnlink++; 1743 if (DOINGSOFTDEP(vp)) { 1744 softdep_change_linkcnt(dp); 1745 softdep_change_linkcnt(ip); 1746 } 1747 goto out; 1748 } 1749 cache_purge(dvp); 1750 /* 1751 * Truncate inode. The only stuff left in the directory is "." and 1752 * "..". The "." reference is inconsequential since we are quashing 1753 * it. The soft dependency code will arrange to do these operations 1754 * after the parent directory entry has been deleted on disk, so 1755 * when running with that code we avoid doing them now. 1756 */ 1757 if (!DOINGSOFTDEP(vp)) { 1758 dp->i_nlink--; 1759 DIP_SET(dp, i_nlink, dp->i_nlink); 1760 dp->i_flag |= IN_CHANGE; 1761 ip->i_nlink--; 1762 DIP_SET(ip, i_nlink, ip->i_nlink); 1763 ip->i_flag |= IN_CHANGE; 1764 ioflag = IO_NORMAL; 1765 if (!DOINGASYNC(vp)) 1766 ioflag |= IO_SYNC; 1767 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1768 cnp->cn_thread); 1769 } 1770 cache_purge(vp); 1771 #ifdef UFS_DIRHASH 1772 /* Kill any active hash; i_effnlink == 0, so it will not come back. */ 1773 if (ip->i_dirhash != NULL) 1774 ufsdirhash_free(ip); 1775 #endif 1776 out: 1777 return (error); 1778 } 1779 1780 /* 1781 * symlink -- make a symbolic link 1782 */ 1783 static int 1784 ufs_symlink(ap) 1785 struct vop_symlink_args /* { 1786 struct vnode *a_dvp; 1787 struct vnode **a_vpp; 1788 struct componentname *a_cnp; 1789 struct vattr *a_vap; 1790 char *a_target; 1791 } */ *ap; 1792 { 1793 struct vnode *vp, **vpp = ap->a_vpp; 1794 struct inode *ip; 1795 int len, error; 1796 1797 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1798 vpp, ap->a_cnp); 1799 if (error) 1800 return (error); 1801 vp = *vpp; 1802 len = strlen(ap->a_target); 1803 if (len < vp->v_mount->mnt_maxsymlinklen) { 1804 ip = VTOI(vp); 1805 bcopy(ap->a_target, SHORTLINK(ip), len); 1806 ip->i_size = len; 1807 DIP_SET(ip, i_size, len); 1808 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1809 } else 1810 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1811 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1812 ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0); 1813 if (error) 1814 vput(vp); 1815 return (error); 1816 } 1817 1818 /* 1819 * Vnode op for reading directories. 1820 * 1821 * The routine below assumes that the on-disk format of a directory 1822 * is the same as that defined by <sys/dirent.h>. If the on-disk 1823 * format changes, then it will be necessary to do a conversion 1824 * from the on-disk format that read returns to the format defined 1825 * by <sys/dirent.h>. 1826 */ 1827 int 1828 ufs_readdir(ap) 1829 struct vop_readdir_args /* { 1830 struct vnode *a_vp; 1831 struct uio *a_uio; 1832 struct ucred *a_cred; 1833 int *a_eofflag; 1834 int *a_ncookies; 1835 u_long **a_cookies; 1836 } */ *ap; 1837 { 1838 struct uio *uio = ap->a_uio; 1839 int error; 1840 size_t count, lost; 1841 off_t off; 1842 1843 if (ap->a_ncookies != NULL) 1844 /* 1845 * Ensure that the block is aligned. The caller can use 1846 * the cookies to determine where in the block to start. 1847 */ 1848 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1849 off = uio->uio_offset; 1850 count = uio->uio_resid; 1851 /* Make sure we don't return partial entries. */ 1852 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1853 return (EINVAL); 1854 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1855 lost = uio->uio_resid - count; 1856 uio->uio_resid = count; 1857 uio->uio_iov->iov_len = count; 1858 # if (BYTE_ORDER == LITTLE_ENDIAN) 1859 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1860 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1861 } else { 1862 struct dirent *dp, *edp; 1863 struct uio auio; 1864 struct iovec aiov; 1865 caddr_t dirbuf; 1866 int readcnt; 1867 u_char tmp; 1868 1869 auio = *uio; 1870 auio.uio_iov = &aiov; 1871 auio.uio_iovcnt = 1; 1872 auio.uio_segflg = UIO_SYSSPACE; 1873 aiov.iov_len = count; 1874 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); 1875 aiov.iov_base = dirbuf; 1876 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1877 if (error == 0) { 1878 readcnt = count - auio.uio_resid; 1879 edp = (struct dirent *)&dirbuf[readcnt]; 1880 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1881 tmp = dp->d_namlen; 1882 dp->d_namlen = dp->d_type; 1883 dp->d_type = tmp; 1884 if (dp->d_reclen > 0) { 1885 dp = (struct dirent *) 1886 ((char *)dp + dp->d_reclen); 1887 } else { 1888 error = EIO; 1889 break; 1890 } 1891 } 1892 if (dp >= edp) 1893 error = uiomove(dirbuf, readcnt, uio); 1894 } 1895 FREE(dirbuf, M_TEMP); 1896 } 1897 # else 1898 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1899 # endif 1900 if (!error && ap->a_ncookies != NULL) { 1901 struct dirent* dpStart; 1902 struct dirent* dpEnd; 1903 struct dirent* dp; 1904 int ncookies; 1905 u_long *cookies; 1906 u_long *cookiep; 1907 1908 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1909 panic("ufs_readdir: unexpected uio from NFS server"); 1910 dpStart = (struct dirent *) 1911 ((char *)uio->uio_iov->iov_base - (uio->uio_offset - off)); 1912 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1913 for (dp = dpStart, ncookies = 0; 1914 dp < dpEnd; 1915 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1916 ncookies++; 1917 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1918 M_WAITOK); 1919 for (dp = dpStart, cookiep = cookies; 1920 dp < dpEnd; 1921 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1922 off += dp->d_reclen; 1923 *cookiep++ = (u_long) off; 1924 } 1925 *ap->a_ncookies = ncookies; 1926 *ap->a_cookies = cookies; 1927 } 1928 uio->uio_resid += lost; 1929 if (ap->a_eofflag) 1930 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1931 return (error); 1932 } 1933 1934 /* 1935 * Return target name of a symbolic link 1936 */ 1937 static int 1938 ufs_readlink(ap) 1939 struct vop_readlink_args /* { 1940 struct vnode *a_vp; 1941 struct uio *a_uio; 1942 struct ucred *a_cred; 1943 } */ *ap; 1944 { 1945 struct vnode *vp = ap->a_vp; 1946 struct inode *ip = VTOI(vp); 1947 doff_t isize; 1948 1949 isize = ip->i_size; 1950 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1951 DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */ 1952 return (uiomove(SHORTLINK(ip), isize, ap->a_uio)); 1953 } 1954 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1955 } 1956 1957 /* 1958 * Calculate the logical to physical mapping if not done already, 1959 * then call the device strategy routine. 1960 * 1961 * In order to be able to swap to a file, the ufs_bmaparray() operation may not 1962 * deadlock on memory. See ufs_bmap() for details. 1963 */ 1964 static int 1965 ufs_strategy(ap) 1966 struct vop_strategy_args /* { 1967 struct vnode *a_vp; 1968 struct buf *a_bp; 1969 } */ *ap; 1970 { 1971 struct buf *bp = ap->a_bp; 1972 struct vnode *vp = ap->a_vp; 1973 struct bufobj *bo; 1974 struct inode *ip; 1975 ufs2_daddr_t blkno; 1976 int error; 1977 1978 ip = VTOI(vp); 1979 if (bp->b_blkno == bp->b_lblkno) { 1980 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL); 1981 bp->b_blkno = blkno; 1982 if (error) { 1983 bp->b_error = error; 1984 bp->b_ioflags |= BIO_ERROR; 1985 bufdone(bp); 1986 return (error); 1987 } 1988 if ((long)bp->b_blkno == -1) 1989 vfs_bio_clrbuf(bp); 1990 } 1991 if ((long)bp->b_blkno == -1) { 1992 bufdone(bp); 1993 return (0); 1994 } 1995 bp->b_iooffset = dbtob(bp->b_blkno); 1996 bo = ip->i_umbufobj; 1997 BO_STRATEGY(bo, bp); 1998 return (0); 1999 } 2000 2001 /* 2002 * Print out the contents of an inode. 2003 */ 2004 static int 2005 ufs_print(ap) 2006 struct vop_print_args /* { 2007 struct vnode *a_vp; 2008 } */ *ap; 2009 { 2010 struct vnode *vp = ap->a_vp; 2011 struct inode *ip = VTOI(vp); 2012 2013 printf("\tino %lu, on dev %s", (u_long)ip->i_number, 2014 devtoname(ip->i_dev)); 2015 if (vp->v_type == VFIFO) 2016 fifo_printinfo(vp); 2017 printf("\n"); 2018 return (0); 2019 } 2020 2021 /* 2022 * Close wrapper for fifos. 2023 * 2024 * Update the times on the inode then do device close. 2025 */ 2026 static int 2027 ufsfifo_close(ap) 2028 struct vop_close_args /* { 2029 struct vnode *a_vp; 2030 int a_fflag; 2031 struct ucred *a_cred; 2032 struct thread *a_td; 2033 } */ *ap; 2034 { 2035 struct vnode *vp = ap->a_vp; 2036 int usecount; 2037 2038 VI_LOCK(vp); 2039 usecount = vp->v_usecount; 2040 if (usecount > 1) 2041 ufs_itimes_locked(vp); 2042 VI_UNLOCK(vp); 2043 return (fifo_specops.vop_close(ap)); 2044 } 2045 2046 /* 2047 * Kqfilter wrapper for fifos. 2048 * 2049 * Fall through to ufs kqfilter routines if needed 2050 */ 2051 static int 2052 ufsfifo_kqfilter(ap) 2053 struct vop_kqfilter_args *ap; 2054 { 2055 int error; 2056 2057 error = fifo_specops.vop_kqfilter(ap); 2058 if (error) 2059 error = vfs_kqfilter(ap); 2060 return (error); 2061 } 2062 2063 /* 2064 * Return POSIX pathconf information applicable to ufs filesystems. 2065 */ 2066 static int 2067 ufs_pathconf(ap) 2068 struct vop_pathconf_args /* { 2069 struct vnode *a_vp; 2070 int a_name; 2071 int *a_retval; 2072 } */ *ap; 2073 { 2074 int error; 2075 2076 error = 0; 2077 switch (ap->a_name) { 2078 case _PC_LINK_MAX: 2079 *ap->a_retval = LINK_MAX; 2080 break; 2081 case _PC_NAME_MAX: 2082 *ap->a_retval = NAME_MAX; 2083 break; 2084 case _PC_PATH_MAX: 2085 *ap->a_retval = PATH_MAX; 2086 break; 2087 case _PC_PIPE_BUF: 2088 *ap->a_retval = PIPE_BUF; 2089 break; 2090 case _PC_CHOWN_RESTRICTED: 2091 *ap->a_retval = 1; 2092 break; 2093 case _PC_NO_TRUNC: 2094 *ap->a_retval = 1; 2095 break; 2096 case _PC_ACL_EXTENDED: 2097 #ifdef UFS_ACL 2098 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2099 *ap->a_retval = 1; 2100 else 2101 *ap->a_retval = 0; 2102 #else 2103 *ap->a_retval = 0; 2104 #endif 2105 break; 2106 case _PC_ACL_PATH_MAX: 2107 #ifdef UFS_ACL 2108 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2109 *ap->a_retval = ACL_MAX_ENTRIES; 2110 else 2111 *ap->a_retval = 3; 2112 #else 2113 *ap->a_retval = 3; 2114 #endif 2115 break; 2116 case _PC_MAC_PRESENT: 2117 #ifdef MAC 2118 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL) 2119 *ap->a_retval = 1; 2120 else 2121 *ap->a_retval = 0; 2122 #else 2123 *ap->a_retval = 0; 2124 #endif 2125 break; 2126 case _PC_ASYNC_IO: 2127 /* _PC_ASYNC_IO should have been handled by upper layers. */ 2128 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 2129 error = EINVAL; 2130 break; 2131 case _PC_PRIO_IO: 2132 *ap->a_retval = 0; 2133 break; 2134 case _PC_SYNC_IO: 2135 *ap->a_retval = 0; 2136 break; 2137 case _PC_ALLOC_SIZE_MIN: 2138 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 2139 break; 2140 case _PC_FILESIZEBITS: 2141 *ap->a_retval = 64; 2142 break; 2143 case _PC_REC_INCR_XFER_SIZE: 2144 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2145 break; 2146 case _PC_REC_MAX_XFER_SIZE: 2147 *ap->a_retval = -1; /* means ``unlimited'' */ 2148 break; 2149 case _PC_REC_MIN_XFER_SIZE: 2150 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2151 break; 2152 case _PC_REC_XFER_ALIGN: 2153 *ap->a_retval = PAGE_SIZE; 2154 break; 2155 case _PC_SYMLINK_MAX: 2156 *ap->a_retval = MAXPATHLEN; 2157 break; 2158 2159 default: 2160 error = EINVAL; 2161 break; 2162 } 2163 return (error); 2164 } 2165 2166 /* 2167 * Advisory record locking support 2168 */ 2169 static int 2170 ufs_advlock(ap) 2171 struct vop_advlock_args /* { 2172 struct vnode *a_vp; 2173 caddr_t a_id; 2174 int a_op; 2175 struct flock *a_fl; 2176 int a_flags; 2177 } */ *ap; 2178 { 2179 struct inode *ip = VTOI(ap->a_vp); 2180 2181 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size)); 2182 } 2183 2184 /* 2185 * Initialize the vnode associated with a new inode, handle aliased 2186 * vnodes. 2187 */ 2188 int 2189 ufs_vinit(mntp, fifoops, vpp) 2190 struct mount *mntp; 2191 struct vop_vector *fifoops; 2192 struct vnode **vpp; 2193 { 2194 struct inode *ip; 2195 struct vnode *vp; 2196 2197 vp = *vpp; 2198 ip = VTOI(vp); 2199 vp->v_type = IFTOVT(ip->i_mode); 2200 if (vp->v_type == VFIFO) 2201 vp->v_op = fifoops; 2202 ASSERT_VOP_LOCKED(vp, "ufs_vinit"); 2203 if (ip->i_number == ROOTINO) 2204 vp->v_vflag |= VV_ROOT; 2205 ip->i_modrev = init_va_filerev(); 2206 *vpp = vp; 2207 return (0); 2208 } 2209 2210 /* 2211 * Allocate a new inode. 2212 * Vnode dvp must be locked. 2213 */ 2214 static int 2215 ufs_makeinode(mode, dvp, vpp, cnp) 2216 int mode; 2217 struct vnode *dvp; 2218 struct vnode **vpp; 2219 struct componentname *cnp; 2220 { 2221 struct inode *ip, *pdir; 2222 struct direct newdir; 2223 struct vnode *tvp; 2224 #ifdef UFS_ACL 2225 struct acl *acl; 2226 #endif 2227 int error; 2228 2229 pdir = VTOI(dvp); 2230 #ifdef DIAGNOSTIC 2231 if ((cnp->cn_flags & HASBUF) == 0) 2232 panic("ufs_makeinode: no name"); 2233 #endif 2234 *vpp = NULL; 2235 if ((mode & IFMT) == 0) 2236 mode |= IFREG; 2237 2238 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2239 if (error) 2240 return (error); 2241 ip = VTOI(tvp); 2242 ip->i_gid = pdir->i_gid; 2243 DIP_SET(ip, i_gid, pdir->i_gid); 2244 #ifdef SUIDDIR 2245 { 2246 #ifdef QUOTA 2247 struct ucred ucred, *ucp; 2248 ucp = cnp->cn_cred; 2249 #endif 2250 /* 2251 * If we are not the owner of the directory, 2252 * and we are hacking owners here, (only do this where told to) 2253 * and we are not giving it TO root, (would subvert quotas) 2254 * then go ahead and give it to the other user. 2255 * Note that this drops off the execute bits for security. 2256 */ 2257 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2258 (pdir->i_mode & ISUID) && 2259 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2260 ip->i_uid = pdir->i_uid; 2261 DIP_SET(ip, i_uid, ip->i_uid); 2262 mode &= ~07111; 2263 #ifdef QUOTA 2264 /* 2265 * Make sure the correct user gets charged 2266 * for the space. 2267 * Quickly knock up a dummy credential for the victim. 2268 * XXX This seems to never be accessed out of our 2269 * context so a stack variable is ok. 2270 */ 2271 refcount_init(&ucred.cr_ref, 1); 2272 ucred.cr_uid = ip->i_uid; 2273 ucred.cr_ngroups = 1; 2274 ucred.cr_groups[0] = pdir->i_gid; 2275 ucp = &ucred; 2276 #endif 2277 } else { 2278 ip->i_uid = cnp->cn_cred->cr_uid; 2279 DIP_SET(ip, i_uid, ip->i_uid); 2280 } 2281 2282 #ifdef QUOTA 2283 if ((error = getinoquota(ip)) || 2284 (error = chkiq(ip, 1, ucp, 0))) { 2285 UFS_VFREE(tvp, ip->i_number, mode); 2286 vput(tvp); 2287 return (error); 2288 } 2289 #endif 2290 } 2291 #else /* !SUIDDIR */ 2292 ip->i_uid = cnp->cn_cred->cr_uid; 2293 DIP_SET(ip, i_uid, ip->i_uid); 2294 #ifdef QUOTA 2295 if ((error = getinoquota(ip)) || 2296 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2297 UFS_VFREE(tvp, ip->i_number, mode); 2298 vput(tvp); 2299 return (error); 2300 } 2301 #endif 2302 #endif /* !SUIDDIR */ 2303 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2304 #ifdef UFS_ACL 2305 acl = NULL; 2306 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 2307 acl = uma_zalloc(acl_zone, M_WAITOK); 2308 2309 /* 2310 * Retrieve default ACL for parent, if any. 2311 */ 2312 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 2313 cnp->cn_thread); 2314 switch (error) { 2315 case 0: 2316 /* 2317 * Retrieved a default ACL, so merge mode and ACL if 2318 * necessary. 2319 */ 2320 if (acl->acl_cnt != 0) { 2321 /* 2322 * Two possible ways for default ACL to not 2323 * be present. First, the EA can be 2324 * undefined, or second, the default ACL can 2325 * be blank. If it's blank, fall through to 2326 * the it's not defined case. 2327 */ 2328 mode = acl_posix1e_newfilemode(mode, acl); 2329 ip->i_mode = mode; 2330 DIP_SET(ip, i_mode, mode); 2331 ufs_sync_acl_from_inode(ip, acl); 2332 break; 2333 } 2334 /* FALLTHROUGH */ 2335 2336 case EOPNOTSUPP: 2337 /* 2338 * Just use the mode as-is. 2339 */ 2340 ip->i_mode = mode; 2341 DIP_SET(ip, i_mode, mode); 2342 uma_zfree(acl_zone, acl); 2343 acl = NULL; 2344 break; 2345 2346 default: 2347 UFS_VFREE(tvp, ip->i_number, mode); 2348 vput(tvp); 2349 uma_zfree(acl_zone, acl); 2350 acl = NULL; 2351 return (error); 2352 } 2353 } else { 2354 #endif 2355 ip->i_mode = mode; 2356 DIP_SET(ip, i_mode, mode); 2357 #ifdef UFS_ACL 2358 } 2359 #endif 2360 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2361 ip->i_effnlink = 1; 2362 ip->i_nlink = 1; 2363 DIP_SET(ip, i_nlink, 1); 2364 if (DOINGSOFTDEP(tvp)) 2365 softdep_change_linkcnt(ip); 2366 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2367 priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) { 2368 ip->i_mode &= ~ISGID; 2369 DIP_SET(ip, i_mode, ip->i_mode); 2370 } 2371 2372 if (cnp->cn_flags & ISWHITEOUT) { 2373 ip->i_flags |= UF_OPAQUE; 2374 DIP_SET(ip, i_flags, ip->i_flags); 2375 } 2376 2377 /* 2378 * Make sure inode goes to disk before directory entry. 2379 */ 2380 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2381 if (error) 2382 goto bad; 2383 #ifdef MAC 2384 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 2385 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 2386 dvp, tvp, cnp); 2387 if (error) 2388 goto bad; 2389 } 2390 #endif 2391 #ifdef UFS_ACL 2392 if (acl != NULL) { 2393 /* 2394 * XXX: If we abort now, will Soft Updates notify the extattr 2395 * code that the EAs for the file need to be released? 2396 */ 2397 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 2398 cnp->cn_thread); 2399 switch (error) { 2400 case 0: 2401 break; 2402 2403 case EOPNOTSUPP: 2404 /* 2405 * XXX: This should not happen, as EOPNOTSUPP above was 2406 * supposed to free acl. 2407 */ 2408 printf("ufs_makeinode: VOP_GETACL() but no " 2409 "VOP_SETACL()\n"); 2410 /* panic("ufs_makeinode: VOP_GETACL() but no " 2411 "VOP_SETACL()"); */ 2412 break; 2413 2414 default: 2415 uma_zfree(acl_zone, acl); 2416 goto bad; 2417 } 2418 uma_zfree(acl_zone, acl); 2419 } 2420 #endif /* !UFS_ACL */ 2421 ufs_makedirentry(ip, cnp, &newdir); 2422 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2423 if (error) 2424 goto bad; 2425 *vpp = tvp; 2426 return (0); 2427 2428 bad: 2429 /* 2430 * Write error occurred trying to update the inode 2431 * or the directory so must deallocate the inode. 2432 */ 2433 ip->i_effnlink = 0; 2434 ip->i_nlink = 0; 2435 DIP_SET(ip, i_nlink, 0); 2436 ip->i_flag |= IN_CHANGE; 2437 if (DOINGSOFTDEP(tvp)) 2438 softdep_change_linkcnt(ip); 2439 vput(tvp); 2440 return (error); 2441 } 2442 2443 /* Global vfs data structures for ufs. */ 2444 struct vop_vector ufs_vnodeops = { 2445 .vop_default = &default_vnodeops, 2446 .vop_fsync = VOP_PANIC, 2447 .vop_read = VOP_PANIC, 2448 .vop_reallocblks = VOP_PANIC, 2449 .vop_write = VOP_PANIC, 2450 .vop_access = ufs_access, 2451 .vop_advlock = ufs_advlock, 2452 .vop_bmap = ufs_bmap, 2453 .vop_cachedlookup = ufs_lookup, 2454 .vop_close = ufs_close, 2455 .vop_create = ufs_create, 2456 .vop_getattr = ufs_getattr, 2457 .vop_inactive = ufs_inactive, 2458 .vop_link = ufs_link, 2459 .vop_lookup = vfs_cache_lookup, 2460 .vop_mkdir = ufs_mkdir, 2461 .vop_mknod = ufs_mknod, 2462 .vop_open = ufs_open, 2463 .vop_pathconf = ufs_pathconf, 2464 .vop_poll = vop_stdpoll, 2465 .vop_print = ufs_print, 2466 .vop_readdir = ufs_readdir, 2467 .vop_readlink = ufs_readlink, 2468 .vop_reclaim = ufs_reclaim, 2469 .vop_remove = ufs_remove, 2470 .vop_rename = ufs_rename, 2471 .vop_rmdir = ufs_rmdir, 2472 .vop_setattr = ufs_setattr, 2473 #ifdef MAC 2474 .vop_setlabel = vop_stdsetlabel_ea, 2475 #endif 2476 .vop_strategy = ufs_strategy, 2477 .vop_symlink = ufs_symlink, 2478 .vop_whiteout = ufs_whiteout, 2479 #ifdef UFS_EXTATTR 2480 .vop_getextattr = ufs_getextattr, 2481 .vop_deleteextattr = ufs_deleteextattr, 2482 .vop_setextattr = ufs_setextattr, 2483 #endif 2484 #ifdef UFS_ACL 2485 .vop_getacl = ufs_getacl, 2486 .vop_setacl = ufs_setacl, 2487 .vop_aclcheck = ufs_aclcheck, 2488 #endif 2489 }; 2490 2491 struct vop_vector ufs_fifoops = { 2492 .vop_default = &fifo_specops, 2493 .vop_fsync = VOP_PANIC, 2494 .vop_access = ufs_access, 2495 .vop_close = ufsfifo_close, 2496 .vop_getattr = ufs_getattr, 2497 .vop_inactive = ufs_inactive, 2498 .vop_kqfilter = ufsfifo_kqfilter, 2499 .vop_print = ufs_print, 2500 .vop_read = VOP_PANIC, 2501 .vop_reclaim = ufs_reclaim, 2502 .vop_setattr = ufs_setattr, 2503 #ifdef MAC 2504 .vop_setlabel = vop_stdsetlabel_ea, 2505 #endif 2506 .vop_write = VOP_PANIC, 2507 #ifdef UFS_EXTATTR 2508 .vop_getextattr = ufs_getextattr, 2509 .vop_deleteextattr = ufs_deleteextattr, 2510 .vop_setextattr = ufs_setextattr, 2511 #endif 2512 #ifdef UFS_ACL 2513 .vop_getacl = ufs_getacl, 2514 .vop_setacl = ufs_setacl, 2515 .vop_aclcheck = ufs_aclcheck, 2516 #endif 2517 };
Cache object: 1c7247a3232263e05af7c94838dbef16
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