Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/ufs/ufs/ufs_vnops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/6.0/sys/ufs/ufs/ufs_vnops.c 147198 2005-06-09 20:20:31Z ssouhlal $"); 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/unistd.h> 57 #include <sys/vnode.h> 58 #include <sys/dirent.h> 59 #include <sys/lockf.h> 60 #include <sys/conf.h> 61 #include <sys/acl.h> 62 #include <sys/mac.h> 63 #include <sys/jail.h> 64 65 #include <machine/mutex.h> 66 67 #include <sys/file.h> /* XXX */ 68 69 #include <vm/vm.h> 70 #include <vm/vm_extern.h> 71 72 #include <fs/fifofs/fifo.h> 73 74 #include <ufs/ufs/acl.h> 75 #include <ufs/ufs/extattr.h> 76 #include <ufs/ufs/quota.h> 77 #include <ufs/ufs/inode.h> 78 #include <ufs/ufs/dir.h> 79 #include <ufs/ufs/ufsmount.h> 80 #include <ufs/ufs/ufs_extern.h> 81 #ifdef UFS_DIRHASH 82 #include <ufs/ufs/dirhash.h> 83 #endif 84 85 #include <ufs/ffs/ffs_extern.h> 86 87 static vop_access_t ufs_access; 88 static vop_advlock_t ufs_advlock; 89 static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *); 90 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *); 91 static vop_close_t ufs_close; 92 static vop_create_t ufs_create; 93 static vop_getattr_t ufs_getattr; 94 static vop_link_t ufs_link; 95 static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 96 static vop_mkdir_t ufs_mkdir; 97 static vop_mknod_t ufs_mknod; 98 static vop_open_t ufs_open; 99 static vop_pathconf_t ufs_pathconf; 100 static vop_print_t ufs_print; 101 static vop_readlink_t ufs_readlink; 102 static vop_remove_t ufs_remove; 103 static vop_rename_t ufs_rename; 104 static vop_rmdir_t ufs_rmdir; 105 static vop_setattr_t ufs_setattr; 106 static vop_strategy_t ufs_strategy; 107 static vop_symlink_t ufs_symlink; 108 static vop_whiteout_t ufs_whiteout; 109 static vop_close_t ufsfifo_close; 110 static vop_kqfilter_t ufsfifo_kqfilter; 111 112 /* 113 * A virgin directory (no blushing please). 114 */ 115 static struct dirtemplate mastertemplate = { 116 0, 12, DT_DIR, 1, ".", 117 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." 118 }; 119 static struct odirtemplate omastertemplate = { 120 0, 12, 1, ".", 121 0, DIRBLKSIZ - 12, 2, ".." 122 }; 123 124 void 125 ufs_itimes(vp) 126 struct vnode *vp; 127 { 128 struct inode *ip; 129 struct timespec ts; 130 131 ip = VTOI(vp); 132 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 133 return; 134 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp)) 135 ip->i_flag |= IN_LAZYMOD; 136 else 137 ip->i_flag |= IN_MODIFIED; 138 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 139 vfs_timestamp(&ts); 140 if (ip->i_flag & IN_ACCESS) { 141 DIP_SET(ip, i_atime, ts.tv_sec); 142 DIP_SET(ip, i_atimensec, ts.tv_nsec); 143 } 144 if (ip->i_flag & IN_UPDATE) { 145 DIP_SET(ip, i_mtime, ts.tv_sec); 146 DIP_SET(ip, i_mtimensec, ts.tv_nsec); 147 ip->i_modrev++; 148 } 149 if (ip->i_flag & IN_CHANGE) { 150 DIP_SET(ip, i_ctime, ts.tv_sec); 151 DIP_SET(ip, i_ctimensec, ts.tv_nsec); 152 } 153 } 154 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 155 } 156 157 /* 158 * Create a regular file 159 */ 160 static int 161 ufs_create(ap) 162 struct vop_create_args /* { 163 struct vnode *a_dvp; 164 struct vnode **a_vpp; 165 struct componentname *a_cnp; 166 struct vattr *a_vap; 167 } */ *ap; 168 { 169 int error; 170 171 error = 172 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 173 ap->a_dvp, ap->a_vpp, ap->a_cnp); 174 if (error) 175 return (error); 176 return (0); 177 } 178 179 /* 180 * Mknod vnode call 181 */ 182 /* ARGSUSED */ 183 static int 184 ufs_mknod(ap) 185 struct vop_mknod_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 struct vattr *vap = ap->a_vap; 193 struct vnode **vpp = ap->a_vpp; 194 struct inode *ip; 195 ino_t ino; 196 int error; 197 198 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 199 ap->a_dvp, vpp, ap->a_cnp); 200 if (error) 201 return (error); 202 ip = VTOI(*vpp); 203 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 204 if (vap->va_rdev != VNOVAL) { 205 /* 206 * Want to be able to use this to make badblock 207 * inodes, so don't truncate the dev number. 208 */ 209 DIP_SET(ip, i_rdev, vap->va_rdev); 210 } 211 /* 212 * Remove inode, then reload it through VFS_VGET so it is 213 * checked to see if it is an alias of an existing entry in 214 * the inode cache. XXX I don't believe this is necessary now. 215 */ 216 (*vpp)->v_type = VNON; 217 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 218 vgone(*vpp); 219 vput(*vpp); 220 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 221 if (error) { 222 *vpp = NULL; 223 return (error); 224 } 225 return (0); 226 } 227 228 /* 229 * Open called. 230 */ 231 /* ARGSUSED */ 232 static int 233 ufs_open(struct vop_open_args *ap) 234 { 235 struct vnode *vp = ap->a_vp; 236 struct inode *ip; 237 238 if (vp->v_type == VCHR || vp->v_type == VBLK) 239 return (EOPNOTSUPP); 240 241 ip = VTOI(vp); 242 /* 243 * Files marked append-only must be opened for appending. 244 */ 245 if ((ip->i_flags & APPEND) && 246 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 247 return (EPERM); 248 vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td); 249 return (0); 250 } 251 252 /* 253 * Close called. 254 * 255 * Update the times on the inode. 256 */ 257 /* ARGSUSED */ 258 static int 259 ufs_close(ap) 260 struct vop_close_args /* { 261 struct vnode *a_vp; 262 int a_fflag; 263 struct ucred *a_cred; 264 struct thread *a_td; 265 } */ *ap; 266 { 267 struct vnode *vp = ap->a_vp; 268 269 VI_LOCK(vp); 270 if (vp->v_usecount > 1) 271 ufs_itimes(vp); 272 VI_UNLOCK(vp); 273 return (0); 274 } 275 276 static int 277 ufs_access(ap) 278 struct vop_access_args /* { 279 struct vnode *a_vp; 280 int a_mode; 281 struct ucred *a_cred; 282 struct thread *a_td; 283 } */ *ap; 284 { 285 struct vnode *vp = ap->a_vp; 286 struct inode *ip = VTOI(vp); 287 mode_t mode = ap->a_mode; 288 int error; 289 #ifdef UFS_ACL 290 struct acl *acl; 291 #endif 292 293 /* 294 * Disallow write attempts on read-only filesystems; 295 * unless the file is a socket, fifo, or a block or 296 * character device resident on the filesystem. 297 */ 298 if (mode & VWRITE) { 299 switch (vp->v_type) { 300 case VDIR: 301 case VLNK: 302 case VREG: 303 if (vp->v_mount->mnt_flag & MNT_RDONLY) 304 return (EROFS); 305 #ifdef QUOTA 306 if ((error = getinoquota(ip)) != 0) 307 return (error); 308 #endif 309 break; 310 default: 311 break; 312 } 313 } 314 315 /* If immutable bit set, nobody gets to write it. */ 316 if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT))) 317 return (EPERM); 318 319 #ifdef UFS_ACL 320 if ((vp->v_mount->mnt_flag & MNT_ACLS) != 0) { 321 MALLOC(acl, struct acl *, sizeof(*acl), M_ACL, M_WAITOK); 322 error = VOP_GETACL(vp, ACL_TYPE_ACCESS, acl, ap->a_cred, 323 ap->a_td); 324 switch (error) { 325 case EOPNOTSUPP: 326 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 327 ip->i_gid, ap->a_mode, ap->a_cred, NULL); 328 break; 329 case 0: 330 error = vaccess_acl_posix1e(vp->v_type, ip->i_uid, 331 ip->i_gid, acl, ap->a_mode, ap->a_cred, NULL); 332 break; 333 default: 334 printf( 335 "ufs_access(): Error retrieving ACL on object (%d).\n", 336 error); 337 /* 338 * XXX: Fall back until debugged. Should 339 * eventually possibly log an error, and return 340 * EPERM for safety. 341 */ 342 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 343 ip->i_gid, ap->a_mode, ap->a_cred, NULL); 344 } 345 FREE(acl, M_ACL); 346 } else 347 #endif /* !UFS_ACL */ 348 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 349 ap->a_mode, ap->a_cred, NULL); 350 return (error); 351 } 352 353 /* ARGSUSED */ 354 static int 355 ufs_getattr(ap) 356 struct vop_getattr_args /* { 357 struct vnode *a_vp; 358 struct vattr *a_vap; 359 struct ucred *a_cred; 360 struct thread *a_td; 361 } */ *ap; 362 { 363 struct vnode *vp = ap->a_vp; 364 struct inode *ip = VTOI(vp); 365 struct vattr *vap = ap->a_vap; 366 367 ufs_itimes(vp); 368 /* 369 * Copy from inode table 370 */ 371 vap->va_fsid = dev2udev(ip->i_dev); 372 vap->va_fileid = ip->i_number; 373 vap->va_mode = ip->i_mode & ~IFMT; 374 vap->va_nlink = ip->i_effnlink; 375 vap->va_uid = ip->i_uid; 376 vap->va_gid = ip->i_gid; 377 if (ip->i_ump->um_fstype == UFS1) { 378 vap->va_rdev = ip->i_din1->di_rdev; 379 vap->va_size = ip->i_din1->di_size; 380 vap->va_atime.tv_sec = ip->i_din1->di_atime; 381 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec; 382 vap->va_mtime.tv_sec = ip->i_din1->di_mtime; 383 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec; 384 vap->va_ctime.tv_sec = ip->i_din1->di_ctime; 385 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec; 386 vap->va_birthtime.tv_sec = 0; 387 vap->va_birthtime.tv_nsec = 0; 388 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks); 389 } else { 390 vap->va_rdev = ip->i_din2->di_rdev; 391 vap->va_size = ip->i_din2->di_size; 392 vap->va_atime.tv_sec = ip->i_din2->di_atime; 393 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec; 394 vap->va_mtime.tv_sec = ip->i_din2->di_mtime; 395 vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec; 396 vap->va_ctime.tv_sec = ip->i_din2->di_ctime; 397 vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec; 398 vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime; 399 vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec; 400 vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks); 401 } 402 vap->va_flags = ip->i_flags; 403 vap->va_gen = ip->i_gen; 404 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 405 vap->va_type = IFTOVT(ip->i_mode); 406 vap->va_filerev = ip->i_modrev; 407 return (0); 408 } 409 410 /* 411 * Set attribute vnode op. called from several syscalls 412 */ 413 static int 414 ufs_setattr(ap) 415 struct vop_setattr_args /* { 416 struct vnode *a_vp; 417 struct vattr *a_vap; 418 struct ucred *a_cred; 419 struct thread *a_td; 420 } */ *ap; 421 { 422 struct vattr *vap = ap->a_vap; 423 struct vnode *vp = ap->a_vp; 424 struct inode *ip = VTOI(vp); 425 struct ucred *cred = ap->a_cred; 426 struct thread *td = ap->a_td; 427 int error; 428 429 /* 430 * Check for unsettable attributes. 431 */ 432 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 433 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 434 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 435 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 436 return (EINVAL); 437 } 438 /* 439 * Update the file's access time when it has been executed. We are 440 * doing this here to specifically avoid some of the checks done 441 * below -- this operation is done by request of the kernel and 442 * should bypass some security checks. Things like read-only 443 * checks get handled by other levels (e.g., ffs_update()). 444 */ 445 if (vap->va_vaflags & VA_EXECVE_ATIME) { 446 ip->i_flag |= IN_ACCESS; 447 return (0); 448 } 449 if (vap->va_flags != VNOVAL) { 450 if (vp->v_mount->mnt_flag & MNT_RDONLY) 451 return (EROFS); 452 /* 453 * Callers may only modify the file flags on objects they 454 * have VADMIN rights for. 455 */ 456 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 457 return (error); 458 /* 459 * Unprivileged processes are not permitted to unset system 460 * flags, or modify flags if any system flags are set. 461 * Privileged non-jail processes may not modify system flags 462 * if securelevel > 0 and any existing system flags are set. 463 * Privileged jail processes behave like privileged non-jail 464 * processes if the security.jail.chflags_allowed sysctl is 465 * is non-zero; otherwise, they behave like unprivileged 466 * processes. 467 */ 468 if (!suser_cred(cred, 469 jail_chflags_allowed ? SUSER_ALLOWJAIL : 0)) { 470 if (ip->i_flags 471 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 472 error = securelevel_gt(cred, 0); 473 if (error) 474 return (error); 475 } 476 /* Snapshot flag cannot be set or cleared */ 477 if (((vap->va_flags & SF_SNAPSHOT) != 0 && 478 (ip->i_flags & SF_SNAPSHOT) == 0) || 479 ((vap->va_flags & SF_SNAPSHOT) == 0 && 480 (ip->i_flags & SF_SNAPSHOT) != 0)) 481 return (EPERM); 482 ip->i_flags = vap->va_flags; 483 DIP_SET(ip, i_flags, vap->va_flags); 484 } else { 485 if (ip->i_flags 486 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 487 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 488 return (EPERM); 489 ip->i_flags &= SF_SETTABLE; 490 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 491 DIP_SET(ip, i_flags, ip->i_flags); 492 } 493 ip->i_flag |= IN_CHANGE; 494 if (vap->va_flags & (IMMUTABLE | APPEND)) 495 return (0); 496 } 497 if (ip->i_flags & (IMMUTABLE | APPEND)) 498 return (EPERM); 499 /* 500 * Go through the fields and update iff not VNOVAL. 501 */ 502 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 503 if (vp->v_mount->mnt_flag & MNT_RDONLY) 504 return (EROFS); 505 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, 506 td)) != 0) 507 return (error); 508 } 509 if (vap->va_size != VNOVAL) { 510 /* 511 * Disallow write attempts on read-only filesystems; 512 * unless the file is a socket, fifo, or a block or 513 * character device resident on the filesystem. 514 */ 515 switch (vp->v_type) { 516 case VDIR: 517 return (EISDIR); 518 case VLNK: 519 case VREG: 520 if (vp->v_mount->mnt_flag & MNT_RDONLY) 521 return (EROFS); 522 if ((ip->i_flags & SF_SNAPSHOT) != 0) 523 return (EPERM); 524 break; 525 default: 526 break; 527 } 528 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL, 529 cred, td)) != 0) 530 return (error); 531 } 532 if (vap->va_atime.tv_sec != VNOVAL || 533 vap->va_mtime.tv_sec != VNOVAL || 534 vap->va_birthtime.tv_sec != VNOVAL) { 535 if (vp->v_mount->mnt_flag & MNT_RDONLY) 536 return (EROFS); 537 if ((ip->i_flags & SF_SNAPSHOT) != 0) 538 return (EPERM); 539 /* 540 * From utimes(2): 541 * If times is NULL, ... The caller must be the owner of 542 * the file, have permission to write the file, or be the 543 * super-user. 544 * If times is non-NULL, ... The caller must be the owner of 545 * the file or be the super-user. 546 */ 547 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 548 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 549 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 550 return (error); 551 if (vap->va_atime.tv_sec != VNOVAL) 552 ip->i_flag |= IN_ACCESS; 553 if (vap->va_mtime.tv_sec != VNOVAL) 554 ip->i_flag |= IN_CHANGE | IN_UPDATE; 555 if (vap->va_birthtime.tv_sec != VNOVAL && 556 ip->i_ump->um_fstype == UFS2) 557 ip->i_flag |= IN_MODIFIED; 558 ufs_itimes(vp); 559 if (vap->va_atime.tv_sec != VNOVAL) { 560 DIP_SET(ip, i_atime, vap->va_atime.tv_sec); 561 DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec); 562 } 563 if (vap->va_mtime.tv_sec != VNOVAL) { 564 DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec); 565 DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec); 566 } 567 if (vap->va_birthtime.tv_sec != VNOVAL && 568 ip->i_ump->um_fstype == UFS2) { 569 ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec; 570 ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec; 571 } 572 error = UFS_UPDATE(vp, 0); 573 if (error) 574 return (error); 575 } 576 error = 0; 577 if (vap->va_mode != (mode_t)VNOVAL) { 578 if (vp->v_mount->mnt_flag & MNT_RDONLY) 579 return (EROFS); 580 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode & 581 (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH))) 582 return (EPERM); 583 error = ufs_chmod(vp, (int)vap->va_mode, cred, td); 584 } 585 return (error); 586 } 587 588 /* 589 * Change the mode on a file. 590 * Inode must be locked before calling. 591 */ 592 static int 593 ufs_chmod(vp, mode, cred, td) 594 struct vnode *vp; 595 int mode; 596 struct ucred *cred; 597 struct thread *td; 598 { 599 struct inode *ip = VTOI(vp); 600 int error; 601 602 /* 603 * To modify the permissions on a file, must possess VADMIN 604 * for that file. 605 */ 606 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 607 return (error); 608 /* 609 * Privileged processes may set the sticky bit on non-directories, 610 * as well as set the setgid bit on a file with a group that the 611 * process is not a member of. Both of these are allowed in 612 * jail(8). 613 */ 614 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 615 if (suser_cred(cred, SUSER_ALLOWJAIL)) 616 return (EFTYPE); 617 } 618 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 619 error = suser_cred(cred, SUSER_ALLOWJAIL); 620 if (error) 621 return (error); 622 } 623 ip->i_mode &= ~ALLPERMS; 624 ip->i_mode |= (mode & ALLPERMS); 625 DIP_SET(ip, i_mode, ip->i_mode); 626 ip->i_flag |= IN_CHANGE; 627 return (0); 628 } 629 630 /* 631 * Perform chown operation on inode ip; 632 * inode must be locked prior to call. 633 */ 634 static int 635 ufs_chown(vp, uid, gid, cred, td) 636 struct vnode *vp; 637 uid_t uid; 638 gid_t gid; 639 struct ucred *cred; 640 struct thread *td; 641 { 642 struct inode *ip = VTOI(vp); 643 uid_t ouid; 644 gid_t ogid; 645 int error = 0; 646 #ifdef QUOTA 647 int i; 648 ufs2_daddr_t change; 649 #endif 650 651 if (uid == (uid_t)VNOVAL) 652 uid = ip->i_uid; 653 if (gid == (gid_t)VNOVAL) 654 gid = ip->i_gid; 655 /* 656 * To modify the ownership of a file, must possess VADMIN 657 * for that file. 658 */ 659 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 660 return (error); 661 /* 662 * To change the owner of a file, or change the group of a file 663 * to a group of which we are not a member, the caller must 664 * have privilege. 665 */ 666 if ((uid != ip->i_uid || 667 (gid != ip->i_gid && !groupmember(gid, cred))) && 668 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 669 return (error); 670 ogid = ip->i_gid; 671 ouid = ip->i_uid; 672 #ifdef QUOTA 673 if ((error = getinoquota(ip)) != 0) 674 return (error); 675 if (ouid == uid) { 676 dqrele(vp, ip->i_dquot[USRQUOTA]); 677 ip->i_dquot[USRQUOTA] = NODQUOT; 678 } 679 if (ogid == gid) { 680 dqrele(vp, ip->i_dquot[GRPQUOTA]); 681 ip->i_dquot[GRPQUOTA] = NODQUOT; 682 } 683 change = DIP(ip, i_blocks); 684 (void) chkdq(ip, -change, cred, CHOWN); 685 (void) chkiq(ip, -1, cred, CHOWN); 686 for (i = 0; i < MAXQUOTAS; i++) { 687 dqrele(vp, ip->i_dquot[i]); 688 ip->i_dquot[i] = NODQUOT; 689 } 690 #endif 691 ip->i_gid = gid; 692 DIP_SET(ip, i_gid, gid); 693 ip->i_uid = uid; 694 DIP_SET(ip, i_uid, uid); 695 #ifdef QUOTA 696 if ((error = getinoquota(ip)) == 0) { 697 if (ouid == uid) { 698 dqrele(vp, ip->i_dquot[USRQUOTA]); 699 ip->i_dquot[USRQUOTA] = NODQUOT; 700 } 701 if (ogid == gid) { 702 dqrele(vp, ip->i_dquot[GRPQUOTA]); 703 ip->i_dquot[GRPQUOTA] = NODQUOT; 704 } 705 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 706 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 707 goto good; 708 else 709 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 710 } 711 for (i = 0; i < MAXQUOTAS; i++) { 712 dqrele(vp, ip->i_dquot[i]); 713 ip->i_dquot[i] = NODQUOT; 714 } 715 } 716 ip->i_gid = ogid; 717 DIP_SET(ip, i_gid, ogid); 718 ip->i_uid = ouid; 719 DIP_SET(ip, i_uid, ouid); 720 if (getinoquota(ip) == 0) { 721 if (ouid == uid) { 722 dqrele(vp, ip->i_dquot[USRQUOTA]); 723 ip->i_dquot[USRQUOTA] = NODQUOT; 724 } 725 if (ogid == gid) { 726 dqrele(vp, ip->i_dquot[GRPQUOTA]); 727 ip->i_dquot[GRPQUOTA] = NODQUOT; 728 } 729 (void) chkdq(ip, change, cred, FORCE|CHOWN); 730 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 731 (void) getinoquota(ip); 732 } 733 return (error); 734 good: 735 if (getinoquota(ip)) 736 panic("ufs_chown: lost quota"); 737 #endif /* QUOTA */ 738 ip->i_flag |= IN_CHANGE; 739 if (suser_cred(cred, SUSER_ALLOWJAIL) && (ouid != uid || ogid != gid)) { 740 ip->i_mode &= ~(ISUID | ISGID); 741 DIP_SET(ip, i_mode, ip->i_mode); 742 } 743 return (0); 744 } 745 746 static int 747 ufs_remove(ap) 748 struct vop_remove_args /* { 749 struct vnode *a_dvp; 750 struct vnode *a_vp; 751 struct componentname *a_cnp; 752 } */ *ap; 753 { 754 struct inode *ip; 755 struct vnode *vp = ap->a_vp; 756 struct vnode *dvp = ap->a_dvp; 757 int error; 758 759 ip = VTOI(vp); 760 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 761 (VTOI(dvp)->i_flags & APPEND)) { 762 error = EPERM; 763 goto out; 764 } 765 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 766 if (ip->i_nlink <= 0) 767 vp->v_vflag |= VV_NOSYNC; 768 out: 769 return (error); 770 } 771 772 /* 773 * link vnode call 774 */ 775 static int 776 ufs_link(ap) 777 struct vop_link_args /* { 778 struct vnode *a_tdvp; 779 struct vnode *a_vp; 780 struct componentname *a_cnp; 781 } */ *ap; 782 { 783 struct vnode *vp = ap->a_vp; 784 struct vnode *tdvp = ap->a_tdvp; 785 struct componentname *cnp = ap->a_cnp; 786 struct inode *ip; 787 struct direct newdir; 788 int error; 789 790 #ifdef DIAGNOSTIC 791 if ((cnp->cn_flags & HASBUF) == 0) 792 panic("ufs_link: no name"); 793 #endif 794 if (tdvp->v_mount != vp->v_mount) { 795 error = EXDEV; 796 goto out; 797 } 798 ip = VTOI(vp); 799 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 800 error = EMLINK; 801 goto out; 802 } 803 if (ip->i_flags & (IMMUTABLE | APPEND)) { 804 error = EPERM; 805 goto out; 806 } 807 ip->i_effnlink++; 808 ip->i_nlink++; 809 DIP_SET(ip, i_nlink, ip->i_nlink); 810 ip->i_flag |= IN_CHANGE; 811 if (DOINGSOFTDEP(vp)) 812 softdep_change_linkcnt(ip); 813 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 814 if (!error) { 815 ufs_makedirentry(ip, cnp, &newdir); 816 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 817 } 818 819 if (error) { 820 ip->i_effnlink--; 821 ip->i_nlink--; 822 DIP_SET(ip, i_nlink, ip->i_nlink); 823 ip->i_flag |= IN_CHANGE; 824 if (DOINGSOFTDEP(vp)) 825 softdep_change_linkcnt(ip); 826 } 827 out: 828 return (error); 829 } 830 831 /* 832 * whiteout vnode call 833 */ 834 static int 835 ufs_whiteout(ap) 836 struct vop_whiteout_args /* { 837 struct vnode *a_dvp; 838 struct componentname *a_cnp; 839 int a_flags; 840 } */ *ap; 841 { 842 struct vnode *dvp = ap->a_dvp; 843 struct componentname *cnp = ap->a_cnp; 844 struct direct newdir; 845 int error = 0; 846 847 switch (ap->a_flags) { 848 case LOOKUP: 849 /* 4.4 format directories support whiteout operations */ 850 if (dvp->v_mount->mnt_maxsymlinklen > 0) 851 return (0); 852 return (EOPNOTSUPP); 853 854 case CREATE: 855 /* create a new directory whiteout */ 856 #ifdef DIAGNOSTIC 857 if ((cnp->cn_flags & SAVENAME) == 0) 858 panic("ufs_whiteout: missing name"); 859 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 860 panic("ufs_whiteout: old format filesystem"); 861 #endif 862 863 newdir.d_ino = WINO; 864 newdir.d_namlen = cnp->cn_namelen; 865 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 866 newdir.d_type = DT_WHT; 867 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 868 break; 869 870 case DELETE: 871 /* remove an existing directory whiteout */ 872 #ifdef DIAGNOSTIC 873 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 874 panic("ufs_whiteout: old format filesystem"); 875 #endif 876 877 cnp->cn_flags &= ~DOWHITEOUT; 878 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 879 break; 880 default: 881 panic("ufs_whiteout: unknown op"); 882 } 883 return (error); 884 } 885 886 /* 887 * Rename system call. 888 * rename("foo", "bar"); 889 * is essentially 890 * unlink("bar"); 891 * link("foo", "bar"); 892 * unlink("foo"); 893 * but ``atomically''. Can't do full commit without saving state in the 894 * inode on disk which isn't feasible at this time. Best we can do is 895 * always guarantee the target exists. 896 * 897 * Basic algorithm is: 898 * 899 * 1) Bump link count on source while we're linking it to the 900 * target. This also ensure the inode won't be deleted out 901 * from underneath us while we work (it may be truncated by 902 * a concurrent `trunc' or `open' for creation). 903 * 2) Link source to destination. If destination already exists, 904 * delete it first. 905 * 3) Unlink source reference to inode if still around. If a 906 * directory was moved and the parent of the destination 907 * is different from the source, patch the ".." entry in the 908 * directory. 909 */ 910 static int 911 ufs_rename(ap) 912 struct vop_rename_args /* { 913 struct vnode *a_fdvp; 914 struct vnode *a_fvp; 915 struct componentname *a_fcnp; 916 struct vnode *a_tdvp; 917 struct vnode *a_tvp; 918 struct componentname *a_tcnp; 919 } */ *ap; 920 { 921 struct vnode *tvp = ap->a_tvp; 922 struct vnode *tdvp = ap->a_tdvp; 923 struct vnode *fvp = ap->a_fvp; 924 struct vnode *fdvp = ap->a_fdvp; 925 struct componentname *tcnp = ap->a_tcnp; 926 struct componentname *fcnp = ap->a_fcnp; 927 struct thread *td = fcnp->cn_thread; 928 struct inode *ip, *xp, *dp; 929 struct direct newdir; 930 int doingdirectory = 0, oldparent = 0, newparent = 0; 931 int error = 0, ioflag; 932 933 #ifdef DIAGNOSTIC 934 if ((tcnp->cn_flags & HASBUF) == 0 || 935 (fcnp->cn_flags & HASBUF) == 0) 936 panic("ufs_rename: no name"); 937 #endif 938 /* 939 * Check for cross-device rename. 940 */ 941 if ((fvp->v_mount != tdvp->v_mount) || 942 (tvp && (fvp->v_mount != tvp->v_mount))) { 943 error = EXDEV; 944 abortit: 945 if (tdvp == tvp) 946 vrele(tdvp); 947 else 948 vput(tdvp); 949 if (tvp) 950 vput(tvp); 951 vrele(fdvp); 952 vrele(fvp); 953 return (error); 954 } 955 956 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 957 (VTOI(tdvp)->i_flags & APPEND))) { 958 error = EPERM; 959 goto abortit; 960 } 961 962 /* 963 * Renaming a file to itself has no effect. The upper layers should 964 * not call us in that case. Temporarily just warn if they do. 965 */ 966 if (fvp == tvp) { 967 printf("ufs_rename: fvp == tvp (can't happen)\n"); 968 error = 0; 969 goto abortit; 970 } 971 972 if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0) 973 goto abortit; 974 dp = VTOI(fdvp); 975 ip = VTOI(fvp); 976 if (ip->i_nlink >= LINK_MAX) { 977 VOP_UNLOCK(fvp, 0, td); 978 error = EMLINK; 979 goto abortit; 980 } 981 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 982 || (dp->i_flags & APPEND)) { 983 VOP_UNLOCK(fvp, 0, td); 984 error = EPERM; 985 goto abortit; 986 } 987 if ((ip->i_mode & IFMT) == IFDIR) { 988 /* 989 * Avoid ".", "..", and aliases of "." for obvious reasons. 990 */ 991 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 992 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 993 (ip->i_flag & IN_RENAME)) { 994 VOP_UNLOCK(fvp, 0, td); 995 error = EINVAL; 996 goto abortit; 997 } 998 ip->i_flag |= IN_RENAME; 999 oldparent = dp->i_number; 1000 doingdirectory = 1; 1001 } 1002 vrele(fdvp); 1003 1004 /* 1005 * When the target exists, both the directory 1006 * and target vnodes are returned locked. 1007 */ 1008 dp = VTOI(tdvp); 1009 xp = NULL; 1010 if (tvp) 1011 xp = VTOI(tvp); 1012 1013 /* 1014 * 1) Bump link count while we're moving stuff 1015 * around. If we crash somewhere before 1016 * completing our work, the link count 1017 * may be wrong, but correctable. 1018 */ 1019 ip->i_effnlink++; 1020 ip->i_nlink++; 1021 DIP_SET(ip, i_nlink, ip->i_nlink); 1022 ip->i_flag |= IN_CHANGE; 1023 if (DOINGSOFTDEP(fvp)) 1024 softdep_change_linkcnt(ip); 1025 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 1026 DOINGASYNC(fvp)))) != 0) { 1027 VOP_UNLOCK(fvp, 0, td); 1028 goto bad; 1029 } 1030 1031 /* 1032 * If ".." must be changed (ie the directory gets a new 1033 * parent) then the source directory must not be in the 1034 * directory heirarchy above the target, as this would 1035 * orphan everything below the source directory. Also 1036 * the user must have write permission in the source so 1037 * as to be able to change "..". We must repeat the call 1038 * to namei, as the parent directory is unlocked by the 1039 * call to checkpath(). 1040 */ 1041 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1042 VOP_UNLOCK(fvp, 0, td); 1043 if (oldparent != dp->i_number) 1044 newparent = dp->i_number; 1045 if (doingdirectory && newparent) { 1046 if (error) /* write access check above */ 1047 goto bad; 1048 if (xp != NULL) 1049 vput(tvp); 1050 error = ufs_checkpath(ip, dp, tcnp->cn_cred); 1051 if (error) 1052 goto out; 1053 if ((tcnp->cn_flags & SAVESTART) == 0) 1054 panic("ufs_rename: lost to startdir"); 1055 VREF(tdvp); 1056 error = relookup(tdvp, &tvp, tcnp); 1057 if (error) 1058 goto out; 1059 vrele(tdvp); 1060 dp = VTOI(tdvp); 1061 xp = NULL; 1062 if (tvp) 1063 xp = VTOI(tvp); 1064 } 1065 /* 1066 * 2) If target doesn't exist, link the target 1067 * to the source and unlink the source. 1068 * Otherwise, rewrite the target directory 1069 * entry to reference the source inode and 1070 * expunge the original entry's existence. 1071 */ 1072 if (xp == NULL) { 1073 if (dp->i_dev != ip->i_dev) 1074 panic("ufs_rename: EXDEV"); 1075 /* 1076 * Account for ".." in new directory. 1077 * When source and destination have the same 1078 * parent we don't fool with the link count. 1079 */ 1080 if (doingdirectory && newparent) { 1081 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1082 error = EMLINK; 1083 goto bad; 1084 } 1085 dp->i_effnlink++; 1086 dp->i_nlink++; 1087 DIP_SET(dp, i_nlink, dp->i_nlink); 1088 dp->i_flag |= IN_CHANGE; 1089 if (DOINGSOFTDEP(tdvp)) 1090 softdep_change_linkcnt(dp); 1091 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1092 DOINGASYNC(tdvp))); 1093 if (error) 1094 goto bad; 1095 } 1096 ufs_makedirentry(ip, tcnp, &newdir); 1097 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1098 if (error) { 1099 if (doingdirectory && newparent) { 1100 dp->i_effnlink--; 1101 dp->i_nlink--; 1102 DIP_SET(dp, i_nlink, dp->i_nlink); 1103 dp->i_flag |= IN_CHANGE; 1104 if (DOINGSOFTDEP(tdvp)) 1105 softdep_change_linkcnt(dp); 1106 (void)UFS_UPDATE(tdvp, 1); 1107 } 1108 goto bad; 1109 } 1110 vput(tdvp); 1111 } else { 1112 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1113 panic("ufs_rename: EXDEV"); 1114 /* 1115 * Short circuit rename(foo, foo). 1116 */ 1117 if (xp->i_number == ip->i_number) 1118 panic("ufs_rename: same file"); 1119 /* 1120 * If the parent directory is "sticky", then the caller 1121 * must possess VADMIN for the parent directory, or the 1122 * destination of the rename. This implements append-only 1123 * directories. 1124 */ 1125 if ((dp->i_mode & S_ISTXT) && 1126 VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) && 1127 VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) { 1128 error = EPERM; 1129 goto bad; 1130 } 1131 /* 1132 * Target must be empty if a directory and have no links 1133 * to it. Also, ensure source and target are compatible 1134 * (both directories, or both not directories). 1135 */ 1136 if ((xp->i_mode&IFMT) == IFDIR) { 1137 if ((xp->i_effnlink > 2) || 1138 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1139 error = ENOTEMPTY; 1140 goto bad; 1141 } 1142 if (!doingdirectory) { 1143 error = ENOTDIR; 1144 goto bad; 1145 } 1146 cache_purge(tdvp); 1147 } else if (doingdirectory) { 1148 error = EISDIR; 1149 goto bad; 1150 } 1151 error = ufs_dirrewrite(dp, xp, ip->i_number, 1152 IFTODT(ip->i_mode), 1153 (doingdirectory && newparent) ? newparent : doingdirectory); 1154 if (error) 1155 goto bad; 1156 if (doingdirectory) { 1157 if (!newparent) { 1158 dp->i_effnlink--; 1159 if (DOINGSOFTDEP(tdvp)) 1160 softdep_change_linkcnt(dp); 1161 } 1162 xp->i_effnlink--; 1163 if (DOINGSOFTDEP(tvp)) 1164 softdep_change_linkcnt(xp); 1165 } 1166 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1167 /* 1168 * Truncate inode. The only stuff left in the directory 1169 * is "." and "..". The "." reference is inconsequential 1170 * since we are quashing it. We have removed the "." 1171 * reference and the reference in the parent directory, 1172 * but there may be other hard links. The soft 1173 * dependency code will arrange to do these operations 1174 * after the parent directory entry has been deleted on 1175 * disk, so when running with that code we avoid doing 1176 * them now. 1177 */ 1178 if (!newparent) { 1179 dp->i_nlink--; 1180 DIP_SET(dp, i_nlink, dp->i_nlink); 1181 dp->i_flag |= IN_CHANGE; 1182 } 1183 xp->i_nlink--; 1184 DIP_SET(xp, i_nlink, xp->i_nlink); 1185 xp->i_flag |= IN_CHANGE; 1186 ioflag = IO_NORMAL; 1187 if (DOINGASYNC(tvp)) 1188 ioflag |= IO_SYNC; 1189 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1190 tcnp->cn_cred, tcnp->cn_thread)) != 0) 1191 goto bad; 1192 } 1193 vput(tdvp); 1194 vput(tvp); 1195 xp = NULL; 1196 } 1197 1198 /* 1199 * 3) Unlink the source. 1200 */ 1201 fcnp->cn_flags &= ~MODMASK; 1202 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1203 if ((fcnp->cn_flags & SAVESTART) == 0) 1204 panic("ufs_rename: lost from startdir"); 1205 VREF(fdvp); 1206 error = relookup(fdvp, &fvp, fcnp); 1207 if (error == 0) 1208 vrele(fdvp); 1209 if (fvp != NULL) { 1210 xp = VTOI(fvp); 1211 dp = VTOI(fdvp); 1212 } else { 1213 /* 1214 * From name has disappeared. IN_RENAME is not sufficient 1215 * to protect against directory races due to timing windows, 1216 * so we have to remove the panic. XXX the only real way 1217 * to solve this issue is at a much higher level. By the 1218 * time we hit ufs_rename() it's too late. 1219 */ 1220 #if 0 1221 if (doingdirectory) 1222 panic("ufs_rename: lost dir entry"); 1223 #endif 1224 vrele(ap->a_fvp); 1225 return (0); 1226 } 1227 /* 1228 * Ensure that the directory entry still exists and has not 1229 * changed while the new name has been entered. If the source is 1230 * a file then the entry may have been unlinked or renamed. In 1231 * either case there is no further work to be done. If the source 1232 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1233 * flag ensures that it cannot be moved by another rename or removed 1234 * by a rmdir. 1235 */ 1236 if (xp != ip) { 1237 /* 1238 * From name resolves to a different inode. IN_RENAME is 1239 * not sufficient protection against timing window races 1240 * so we can't panic here. XXX the only real way 1241 * to solve this issue is at a much higher level. By the 1242 * time we hit ufs_rename() it's too late. 1243 */ 1244 #if 0 1245 if (doingdirectory) 1246 panic("ufs_rename: lost dir entry"); 1247 #endif 1248 } else { 1249 /* 1250 * If the source is a directory with a 1251 * new parent, the link count of the old 1252 * parent directory must be decremented 1253 * and ".." set to point to the new parent. 1254 */ 1255 if (doingdirectory && newparent) { 1256 xp->i_offset = mastertemplate.dot_reclen; 1257 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1258 cache_purge(fdvp); 1259 } 1260 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1261 xp->i_flag &= ~IN_RENAME; 1262 } 1263 if (dp) 1264 vput(fdvp); 1265 if (xp) 1266 vput(fvp); 1267 vrele(ap->a_fvp); 1268 return (error); 1269 1270 bad: 1271 if (xp) 1272 vput(ITOV(xp)); 1273 vput(ITOV(dp)); 1274 out: 1275 if (doingdirectory) 1276 ip->i_flag &= ~IN_RENAME; 1277 if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) { 1278 ip->i_effnlink--; 1279 ip->i_nlink--; 1280 DIP_SET(ip, i_nlink, ip->i_nlink); 1281 ip->i_flag |= IN_CHANGE; 1282 ip->i_flag &= ~IN_RENAME; 1283 if (DOINGSOFTDEP(fvp)) 1284 softdep_change_linkcnt(ip); 1285 vput(fvp); 1286 } else 1287 vrele(fvp); 1288 return (error); 1289 } 1290 1291 /* 1292 * Mkdir system call 1293 */ 1294 static int 1295 ufs_mkdir(ap) 1296 struct vop_mkdir_args /* { 1297 struct vnode *a_dvp; 1298 struct vnode **a_vpp; 1299 struct componentname *a_cnp; 1300 struct vattr *a_vap; 1301 } */ *ap; 1302 { 1303 struct vnode *dvp = ap->a_dvp; 1304 struct vattr *vap = ap->a_vap; 1305 struct componentname *cnp = ap->a_cnp; 1306 struct inode *ip, *dp; 1307 struct vnode *tvp; 1308 struct buf *bp; 1309 struct dirtemplate dirtemplate, *dtp; 1310 struct direct newdir; 1311 #ifdef UFS_ACL 1312 struct acl *acl, *dacl; 1313 #endif 1314 int error, dmode; 1315 long blkoff; 1316 1317 #ifdef DIAGNOSTIC 1318 if ((cnp->cn_flags & HASBUF) == 0) 1319 panic("ufs_mkdir: no name"); 1320 #endif 1321 dp = VTOI(dvp); 1322 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1323 error = EMLINK; 1324 goto out; 1325 } 1326 dmode = vap->va_mode & 0777; 1327 dmode |= IFDIR; 1328 /* 1329 * Must simulate part of ufs_makeinode here to acquire the inode, 1330 * but not have it entered in the parent directory. The entry is 1331 * made later after writing "." and ".." entries. 1332 */ 1333 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1334 if (error) 1335 goto out; 1336 ip = VTOI(tvp); 1337 ip->i_gid = dp->i_gid; 1338 DIP_SET(ip, i_gid, dp->i_gid); 1339 #ifdef SUIDDIR 1340 { 1341 #ifdef QUOTA 1342 struct ucred ucred, *ucp; 1343 ucp = cnp->cn_cred; 1344 #endif 1345 /* 1346 * If we are hacking owners here, (only do this where told to) 1347 * and we are not giving it TO root, (would subvert quotas) 1348 * then go ahead and give it to the other user. 1349 * The new directory also inherits the SUID bit. 1350 * If user's UID and dir UID are the same, 1351 * 'give it away' so that the SUID is still forced on. 1352 */ 1353 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1354 (dp->i_mode & ISUID) && dp->i_uid) { 1355 dmode |= ISUID; 1356 ip->i_uid = dp->i_uid; 1357 DIP_SET(ip, i_uid, dp->i_uid); 1358 #ifdef QUOTA 1359 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1360 /* 1361 * Make sure the correct user gets charged 1362 * for the space. 1363 * Make a dummy credential for the victim. 1364 * XXX This seems to never be accessed out of 1365 * our context so a stack variable is ok. 1366 */ 1367 ucred.cr_ref = 1; 1368 ucred.cr_uid = ip->i_uid; 1369 ucred.cr_ngroups = 1; 1370 ucred.cr_groups[0] = dp->i_gid; 1371 ucp = &ucred; 1372 } 1373 #endif 1374 } else { 1375 ip->i_uid = cnp->cn_cred->cr_uid; 1376 DIP_SET(ip, i_uid, ip->i_uid); 1377 } 1378 #ifdef QUOTA 1379 if ((error = getinoquota(ip)) || 1380 (error = chkiq(ip, 1, ucp, 0))) { 1381 UFS_VFREE(tvp, ip->i_number, dmode); 1382 vput(tvp); 1383 return (error); 1384 } 1385 #endif 1386 } 1387 #else /* !SUIDDIR */ 1388 ip->i_uid = cnp->cn_cred->cr_uid; 1389 DIP_SET(ip, i_uid, ip->i_uid); 1390 #ifdef QUOTA 1391 if ((error = getinoquota(ip)) || 1392 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1393 UFS_VFREE(tvp, ip->i_number, dmode); 1394 vput(tvp); 1395 return (error); 1396 } 1397 #endif 1398 #endif /* !SUIDDIR */ 1399 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1400 #ifdef UFS_ACL 1401 acl = dacl = NULL; 1402 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 1403 MALLOC(acl, struct acl *, sizeof(*acl), M_ACL, M_WAITOK); 1404 MALLOC(dacl, struct acl *, sizeof(*dacl), M_ACL, M_WAITOK); 1405 1406 /* 1407 * Retrieve default ACL from parent, if any. 1408 */ 1409 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 1410 cnp->cn_thread); 1411 switch (error) { 1412 case 0: 1413 /* 1414 * Retrieved a default ACL, so merge mode and ACL if 1415 * necessary. If the ACL is empty, fall through to 1416 * the "not defined or available" case. 1417 */ 1418 if (acl->acl_cnt != 0) { 1419 dmode = acl_posix1e_newfilemode(dmode, acl); 1420 ip->i_mode = dmode; 1421 DIP_SET(ip, i_mode, dmode); 1422 *dacl = *acl; 1423 ufs_sync_acl_from_inode(ip, acl); 1424 break; 1425 } 1426 /* FALLTHROUGH */ 1427 1428 case EOPNOTSUPP: 1429 /* 1430 * Just use the mode as-is. 1431 */ 1432 ip->i_mode = dmode; 1433 DIP_SET(ip, i_mode, dmode); 1434 FREE(acl, M_ACL); 1435 FREE(dacl, M_ACL); 1436 dacl = acl = NULL; 1437 break; 1438 1439 default: 1440 UFS_VFREE(tvp, ip->i_number, dmode); 1441 vput(tvp); 1442 FREE(acl, M_ACL); 1443 FREE(dacl, M_ACL); 1444 return (error); 1445 } 1446 } else { 1447 #endif /* !UFS_ACL */ 1448 ip->i_mode = dmode; 1449 DIP_SET(ip, i_mode, dmode); 1450 #ifdef UFS_ACL 1451 } 1452 #endif 1453 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1454 ip->i_effnlink = 2; 1455 ip->i_nlink = 2; 1456 DIP_SET(ip, i_nlink, 2); 1457 if (DOINGSOFTDEP(tvp)) 1458 softdep_change_linkcnt(ip); 1459 if (cnp->cn_flags & ISWHITEOUT) { 1460 ip->i_flags |= UF_OPAQUE; 1461 DIP_SET(ip, i_flags, ip->i_flags); 1462 } 1463 1464 /* 1465 * Bump link count in parent directory to reflect work done below. 1466 * Should be done before reference is created so cleanup is 1467 * possible if we crash. 1468 */ 1469 dp->i_effnlink++; 1470 dp->i_nlink++; 1471 DIP_SET(dp, i_nlink, dp->i_nlink); 1472 dp->i_flag |= IN_CHANGE; 1473 if (DOINGSOFTDEP(dvp)) 1474 softdep_change_linkcnt(dp); 1475 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1476 if (error) 1477 goto bad; 1478 #ifdef MAC 1479 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 1480 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 1481 dvp, tvp, cnp); 1482 if (error) 1483 goto bad; 1484 } 1485 #endif 1486 #ifdef UFS_ACL 1487 if (acl != NULL) { 1488 /* 1489 * XXX: If we abort now, will Soft Updates notify the extattr 1490 * code that the EAs for the file need to be released? 1491 */ 1492 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 1493 cnp->cn_thread); 1494 if (error == 0) 1495 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, 1496 cnp->cn_cred, cnp->cn_thread); 1497 switch (error) { 1498 case 0: 1499 break; 1500 1501 case EOPNOTSUPP: 1502 /* 1503 * XXX: This should not happen, as EOPNOTSUPP above 1504 * was supposed to free acl. 1505 */ 1506 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1507 /* 1508 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()"); 1509 */ 1510 break; 1511 1512 default: 1513 FREE(acl, M_ACL); 1514 FREE(dacl, M_ACL); 1515 dacl = acl = NULL; 1516 goto bad; 1517 } 1518 FREE(acl, M_ACL); 1519 FREE(dacl, M_ACL); 1520 dacl = acl = NULL; 1521 } 1522 #endif /* !UFS_ACL */ 1523 1524 /* 1525 * Initialize directory with "." and ".." from static template. 1526 */ 1527 if (dvp->v_mount->mnt_maxsymlinklen > 0) 1528 dtp = &mastertemplate; 1529 else 1530 dtp = (struct dirtemplate *)&omastertemplate; 1531 dirtemplate = *dtp; 1532 dirtemplate.dot_ino = ip->i_number; 1533 dirtemplate.dotdot_ino = dp->i_number; 1534 if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1535 BA_CLRBUF, &bp)) != 0) 1536 goto bad; 1537 ip->i_size = DIRBLKSIZ; 1538 DIP_SET(ip, i_size, DIRBLKSIZ); 1539 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1540 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1541 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1542 if (DOINGSOFTDEP(tvp)) { 1543 /* 1544 * Ensure that the entire newly allocated block is a 1545 * valid directory so that future growth within the 1546 * block does not have to ensure that the block is 1547 * written before the inode. 1548 */ 1549 blkoff = DIRBLKSIZ; 1550 while (blkoff < bp->b_bcount) { 1551 ((struct direct *) 1552 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1553 blkoff += DIRBLKSIZ; 1554 } 1555 } 1556 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1557 DOINGASYNC(tvp)))) != 0) { 1558 (void)bwrite(bp); 1559 goto bad; 1560 } 1561 /* 1562 * Directory set up, now install its entry in the parent directory. 1563 * 1564 * If we are not doing soft dependencies, then we must write out the 1565 * buffer containing the new directory body before entering the new 1566 * name in the parent. If we are doing soft dependencies, then the 1567 * buffer containing the new directory body will be passed to and 1568 * released in the soft dependency code after the code has attached 1569 * an appropriate ordering dependency to the buffer which ensures that 1570 * the buffer is written before the new name is written in the parent. 1571 */ 1572 if (DOINGASYNC(dvp)) 1573 bdwrite(bp); 1574 else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp)))) 1575 goto bad; 1576 ufs_makedirentry(ip, cnp, &newdir); 1577 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1578 1579 bad: 1580 if (error == 0) { 1581 *ap->a_vpp = tvp; 1582 } else { 1583 #ifdef UFS_ACL 1584 if (acl != NULL) 1585 FREE(acl, M_ACL); 1586 if (dacl != NULL) 1587 FREE(dacl, M_ACL); 1588 #endif 1589 dp->i_effnlink--; 1590 dp->i_nlink--; 1591 DIP_SET(dp, i_nlink, dp->i_nlink); 1592 dp->i_flag |= IN_CHANGE; 1593 if (DOINGSOFTDEP(dvp)) 1594 softdep_change_linkcnt(dp); 1595 /* 1596 * No need to do an explicit VOP_TRUNCATE here, vrele will 1597 * do this for us because we set the link count to 0. 1598 */ 1599 ip->i_effnlink = 0; 1600 ip->i_nlink = 0; 1601 DIP_SET(ip, i_nlink, 0); 1602 ip->i_flag |= IN_CHANGE; 1603 if (DOINGSOFTDEP(tvp)) 1604 softdep_change_linkcnt(ip); 1605 vput(tvp); 1606 } 1607 out: 1608 return (error); 1609 } 1610 1611 /* 1612 * Rmdir system call. 1613 */ 1614 static int 1615 ufs_rmdir(ap) 1616 struct vop_rmdir_args /* { 1617 struct vnode *a_dvp; 1618 struct vnode *a_vp; 1619 struct componentname *a_cnp; 1620 } */ *ap; 1621 { 1622 struct vnode *vp = ap->a_vp; 1623 struct vnode *dvp = ap->a_dvp; 1624 struct componentname *cnp = ap->a_cnp; 1625 struct inode *ip, *dp; 1626 int error, ioflag; 1627 1628 ip = VTOI(vp); 1629 dp = VTOI(dvp); 1630 1631 /* 1632 * Do not remove a directory that is in the process of being renamed. 1633 * Verify the directory is empty (and valid). Rmdir ".." will not be 1634 * valid since ".." will contain a reference to the current directory 1635 * and thus be non-empty. Do not allow the removal of mounted on 1636 * directories (this can happen when an NFS exported filesystem 1637 * tries to remove a locally mounted on directory). 1638 */ 1639 error = 0; 1640 if ((ip->i_flag & IN_RENAME) || ip->i_effnlink < 2) { 1641 error = EINVAL; 1642 goto out; 1643 } 1644 if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1645 error = ENOTEMPTY; 1646 goto out; 1647 } 1648 if ((dp->i_flags & APPEND) 1649 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1650 error = EPERM; 1651 goto out; 1652 } 1653 if (vp->v_mountedhere != 0) { 1654 error = EINVAL; 1655 goto out; 1656 } 1657 /* 1658 * Delete reference to directory before purging 1659 * inode. If we crash in between, the directory 1660 * will be reattached to lost+found, 1661 */ 1662 dp->i_effnlink--; 1663 ip->i_effnlink--; 1664 if (DOINGSOFTDEP(vp)) { 1665 softdep_change_linkcnt(dp); 1666 softdep_change_linkcnt(ip); 1667 } 1668 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1669 if (error) { 1670 dp->i_effnlink++; 1671 ip->i_effnlink++; 1672 if (DOINGSOFTDEP(vp)) { 1673 softdep_change_linkcnt(dp); 1674 softdep_change_linkcnt(ip); 1675 } 1676 goto out; 1677 } 1678 cache_purge(dvp); 1679 /* 1680 * Truncate inode. The only stuff left in the directory is "." and 1681 * "..". The "." reference is inconsequential since we are quashing 1682 * it. The soft dependency code will arrange to do these operations 1683 * after the parent directory entry has been deleted on disk, so 1684 * when running with that code we avoid doing them now. 1685 */ 1686 if (!DOINGSOFTDEP(vp)) { 1687 dp->i_nlink--; 1688 DIP_SET(dp, i_nlink, dp->i_nlink); 1689 dp->i_flag |= IN_CHANGE; 1690 ip->i_nlink--; 1691 DIP_SET(ip, i_nlink, ip->i_nlink); 1692 ip->i_flag |= IN_CHANGE; 1693 ioflag = IO_NORMAL; 1694 if (DOINGASYNC(vp)) 1695 ioflag |= IO_SYNC; 1696 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1697 cnp->cn_thread); 1698 } 1699 cache_purge(vp); 1700 #ifdef UFS_DIRHASH 1701 /* Kill any active hash; i_effnlink == 0, so it will not come back. */ 1702 if (ip->i_dirhash != NULL) 1703 ufsdirhash_free(ip); 1704 #endif 1705 out: 1706 return (error); 1707 } 1708 1709 /* 1710 * symlink -- make a symbolic link 1711 */ 1712 static int 1713 ufs_symlink(ap) 1714 struct vop_symlink_args /* { 1715 struct vnode *a_dvp; 1716 struct vnode **a_vpp; 1717 struct componentname *a_cnp; 1718 struct vattr *a_vap; 1719 char *a_target; 1720 } */ *ap; 1721 { 1722 struct vnode *vp, **vpp = ap->a_vpp; 1723 struct inode *ip; 1724 int len, error; 1725 1726 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1727 vpp, ap->a_cnp); 1728 if (error) 1729 return (error); 1730 vp = *vpp; 1731 len = strlen(ap->a_target); 1732 if (len < vp->v_mount->mnt_maxsymlinklen) { 1733 ip = VTOI(vp); 1734 bcopy(ap->a_target, SHORTLINK(ip), len); 1735 ip->i_size = len; 1736 DIP_SET(ip, i_size, len); 1737 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1738 } else 1739 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1740 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1741 ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0); 1742 if (error) 1743 vput(vp); 1744 return (error); 1745 } 1746 1747 /* 1748 * Vnode op for reading directories. 1749 * 1750 * The routine below assumes that the on-disk format of a directory 1751 * is the same as that defined by <sys/dirent.h>. If the on-disk 1752 * format changes, then it will be necessary to do a conversion 1753 * from the on-disk format that read returns to the format defined 1754 * by <sys/dirent.h>. 1755 */ 1756 int 1757 ufs_readdir(ap) 1758 struct vop_readdir_args /* { 1759 struct vnode *a_vp; 1760 struct uio *a_uio; 1761 struct ucred *a_cred; 1762 int *a_eofflag; 1763 int *ncookies; 1764 u_long **a_cookies; 1765 } */ *ap; 1766 { 1767 struct uio *uio = ap->a_uio; 1768 int error; 1769 size_t count, lost; 1770 off_t off; 1771 1772 if (ap->a_ncookies != NULL) 1773 /* 1774 * Ensure that the block is aligned. The caller can use 1775 * the cookies to determine where in the block to start. 1776 */ 1777 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1778 off = uio->uio_offset; 1779 count = uio->uio_resid; 1780 /* Make sure we don't return partial entries. */ 1781 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1782 return (EINVAL); 1783 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1784 lost = uio->uio_resid - count; 1785 uio->uio_resid = count; 1786 uio->uio_iov->iov_len = count; 1787 # if (BYTE_ORDER == LITTLE_ENDIAN) 1788 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1789 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1790 } else { 1791 struct dirent *dp, *edp; 1792 struct uio auio; 1793 struct iovec aiov; 1794 caddr_t dirbuf; 1795 int readcnt; 1796 u_char tmp; 1797 1798 auio = *uio; 1799 auio.uio_iov = &aiov; 1800 auio.uio_iovcnt = 1; 1801 auio.uio_segflg = UIO_SYSSPACE; 1802 aiov.iov_len = count; 1803 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); 1804 aiov.iov_base = dirbuf; 1805 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1806 if (error == 0) { 1807 readcnt = count - auio.uio_resid; 1808 edp = (struct dirent *)&dirbuf[readcnt]; 1809 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1810 tmp = dp->d_namlen; 1811 dp->d_namlen = dp->d_type; 1812 dp->d_type = tmp; 1813 if (dp->d_reclen > 0) { 1814 dp = (struct dirent *) 1815 ((char *)dp + dp->d_reclen); 1816 } else { 1817 error = EIO; 1818 break; 1819 } 1820 } 1821 if (dp >= edp) 1822 error = uiomove(dirbuf, readcnt, uio); 1823 } 1824 FREE(dirbuf, M_TEMP); 1825 } 1826 # else 1827 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1828 # endif 1829 if (!error && ap->a_ncookies != NULL) { 1830 struct dirent* dpStart; 1831 struct dirent* dpEnd; 1832 struct dirent* dp; 1833 int ncookies; 1834 u_long *cookies; 1835 u_long *cookiep; 1836 1837 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1838 panic("ufs_readdir: unexpected uio from NFS server"); 1839 dpStart = (struct dirent *) 1840 ((char *)uio->uio_iov->iov_base - (uio->uio_offset - off)); 1841 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1842 for (dp = dpStart, ncookies = 0; 1843 dp < dpEnd; 1844 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1845 ncookies++; 1846 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1847 M_WAITOK); 1848 for (dp = dpStart, cookiep = cookies; 1849 dp < dpEnd; 1850 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1851 off += dp->d_reclen; 1852 *cookiep++ = (u_long) off; 1853 } 1854 *ap->a_ncookies = ncookies; 1855 *ap->a_cookies = cookies; 1856 } 1857 uio->uio_resid += lost; 1858 if (ap->a_eofflag) 1859 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1860 return (error); 1861 } 1862 1863 /* 1864 * Return target name of a symbolic link 1865 */ 1866 static int 1867 ufs_readlink(ap) 1868 struct vop_readlink_args /* { 1869 struct vnode *a_vp; 1870 struct uio *a_uio; 1871 struct ucred *a_cred; 1872 } */ *ap; 1873 { 1874 struct vnode *vp = ap->a_vp; 1875 struct inode *ip = VTOI(vp); 1876 doff_t isize; 1877 1878 isize = ip->i_size; 1879 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1880 DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */ 1881 return (uiomove(SHORTLINK(ip), isize, ap->a_uio)); 1882 } 1883 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1884 } 1885 1886 /* 1887 * Calculate the logical to physical mapping if not done already, 1888 * then call the device strategy routine. 1889 * 1890 * In order to be able to swap to a file, the ufs_bmaparray() operation may not 1891 * deadlock on memory. See ufs_bmap() for details. 1892 */ 1893 static int 1894 ufs_strategy(ap) 1895 struct vop_strategy_args /* { 1896 struct vnode *a_vp; 1897 struct buf *a_bp; 1898 } */ *ap; 1899 { 1900 struct buf *bp = ap->a_bp; 1901 struct vnode *vp = ap->a_vp; 1902 struct bufobj *bo; 1903 struct inode *ip; 1904 ufs2_daddr_t blkno; 1905 int error; 1906 1907 ip = VTOI(vp); 1908 if (bp->b_blkno == bp->b_lblkno) { 1909 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL); 1910 bp->b_blkno = blkno; 1911 if (error) { 1912 bp->b_error = error; 1913 bp->b_ioflags |= BIO_ERROR; 1914 bufdone(bp); 1915 return (error); 1916 } 1917 if ((long)bp->b_blkno == -1) 1918 vfs_bio_clrbuf(bp); 1919 } 1920 if ((long)bp->b_blkno == -1) { 1921 bufdone(bp); 1922 return (0); 1923 } 1924 bp->b_iooffset = dbtob(bp->b_blkno); 1925 bo = ip->i_umbufobj; 1926 BO_STRATEGY(bo, bp); 1927 return (0); 1928 } 1929 1930 /* 1931 * Print out the contents of an inode. 1932 */ 1933 static int 1934 ufs_print(ap) 1935 struct vop_print_args /* { 1936 struct vnode *a_vp; 1937 } */ *ap; 1938 { 1939 struct vnode *vp = ap->a_vp; 1940 struct inode *ip = VTOI(vp); 1941 1942 printf("\tino %lu, on dev %s", (u_long)ip->i_number, 1943 devtoname(ip->i_dev)); 1944 if (vp->v_type == VFIFO) 1945 fifo_printinfo(vp); 1946 printf("\n"); 1947 return (0); 1948 } 1949 1950 /* 1951 * Close wrapper for fifos. 1952 * 1953 * Update the times on the inode then do device close. 1954 */ 1955 static int 1956 ufsfifo_close(ap) 1957 struct vop_close_args /* { 1958 struct vnode *a_vp; 1959 int a_fflag; 1960 struct ucred *a_cred; 1961 struct thread *a_td; 1962 } */ *ap; 1963 { 1964 struct vnode *vp = ap->a_vp; 1965 1966 VI_LOCK(vp); 1967 if (vp->v_usecount > 1) 1968 ufs_itimes(vp); 1969 VI_UNLOCK(vp); 1970 return (fifo_specops.vop_close(ap)); 1971 } 1972 1973 /* 1974 * Kqfilter wrapper for fifos. 1975 * 1976 * Fall through to ufs kqfilter routines if needed 1977 */ 1978 static int 1979 ufsfifo_kqfilter(ap) 1980 struct vop_kqfilter_args *ap; 1981 { 1982 int error; 1983 1984 error = fifo_specops.vop_kqfilter(ap); 1985 if (error) 1986 error = vfs_kqfilter(ap); 1987 return (error); 1988 } 1989 1990 /* 1991 * Return POSIX pathconf information applicable to ufs filesystems. 1992 */ 1993 static int 1994 ufs_pathconf(ap) 1995 struct vop_pathconf_args /* { 1996 struct vnode *a_vp; 1997 int a_name; 1998 int *a_retval; 1999 } */ *ap; 2000 { 2001 int error; 2002 2003 error = 0; 2004 switch (ap->a_name) { 2005 case _PC_LINK_MAX: 2006 *ap->a_retval = LINK_MAX; 2007 break; 2008 case _PC_NAME_MAX: 2009 *ap->a_retval = NAME_MAX; 2010 break; 2011 case _PC_PATH_MAX: 2012 *ap->a_retval = PATH_MAX; 2013 break; 2014 case _PC_PIPE_BUF: 2015 *ap->a_retval = PIPE_BUF; 2016 break; 2017 case _PC_CHOWN_RESTRICTED: 2018 *ap->a_retval = 1; 2019 break; 2020 case _PC_NO_TRUNC: 2021 *ap->a_retval = 1; 2022 break; 2023 case _PC_ACL_EXTENDED: 2024 #ifdef UFS_ACL 2025 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2026 *ap->a_retval = 1; 2027 else 2028 *ap->a_retval = 0; 2029 #else 2030 *ap->a_retval = 0; 2031 #endif 2032 break; 2033 case _PC_ACL_PATH_MAX: 2034 #ifdef UFS_ACL 2035 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2036 *ap->a_retval = ACL_MAX_ENTRIES; 2037 else 2038 *ap->a_retval = 3; 2039 #else 2040 *ap->a_retval = 3; 2041 #endif 2042 break; 2043 case _PC_MAC_PRESENT: 2044 #ifdef MAC 2045 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL) 2046 *ap->a_retval = 1; 2047 else 2048 *ap->a_retval = 0; 2049 #else 2050 *ap->a_retval = 0; 2051 #endif 2052 break; 2053 case _PC_ASYNC_IO: 2054 /* _PC_ASYNC_IO should have been handled by upper layers. */ 2055 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 2056 error = EINVAL; 2057 break; 2058 case _PC_PRIO_IO: 2059 *ap->a_retval = 0; 2060 break; 2061 case _PC_SYNC_IO: 2062 *ap->a_retval = 0; 2063 break; 2064 case _PC_ALLOC_SIZE_MIN: 2065 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 2066 break; 2067 case _PC_FILESIZEBITS: 2068 *ap->a_retval = 64; 2069 break; 2070 case _PC_REC_INCR_XFER_SIZE: 2071 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2072 break; 2073 case _PC_REC_MAX_XFER_SIZE: 2074 *ap->a_retval = -1; /* means ``unlimited'' */ 2075 break; 2076 case _PC_REC_MIN_XFER_SIZE: 2077 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2078 break; 2079 case _PC_REC_XFER_ALIGN: 2080 *ap->a_retval = PAGE_SIZE; 2081 break; 2082 case _PC_SYMLINK_MAX: 2083 *ap->a_retval = MAXPATHLEN; 2084 break; 2085 2086 default: 2087 error = EINVAL; 2088 break; 2089 } 2090 return (error); 2091 } 2092 2093 /* 2094 * Advisory record locking support 2095 */ 2096 static int 2097 ufs_advlock(ap) 2098 struct vop_advlock_args /* { 2099 struct vnode *a_vp; 2100 caddr_t a_id; 2101 int a_op; 2102 struct flock *a_fl; 2103 int a_flags; 2104 } */ *ap; 2105 { 2106 struct inode *ip = VTOI(ap->a_vp); 2107 2108 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size)); 2109 } 2110 2111 /* 2112 * Initialize the vnode associated with a new inode, handle aliased 2113 * vnodes. 2114 */ 2115 int 2116 ufs_vinit(mntp, fifoops, vpp) 2117 struct mount *mntp; 2118 struct vop_vector *fifoops; 2119 struct vnode **vpp; 2120 { 2121 struct inode *ip; 2122 struct vnode *vp; 2123 2124 vp = *vpp; 2125 ip = VTOI(vp); 2126 vp->v_type = IFTOVT(ip->i_mode); 2127 if (vp->v_type == VFIFO) 2128 vp->v_op = fifoops; 2129 ASSERT_VOP_LOCKED(vp, "ufs_vinit"); 2130 if (ip->i_number == ROOTINO) 2131 vp->v_vflag |= VV_ROOT; 2132 ip->i_modrev = init_va_filerev(); 2133 *vpp = vp; 2134 return (0); 2135 } 2136 2137 /* 2138 * Allocate a new inode. 2139 * Vnode dvp must be locked. 2140 */ 2141 static int 2142 ufs_makeinode(mode, dvp, vpp, cnp) 2143 int mode; 2144 struct vnode *dvp; 2145 struct vnode **vpp; 2146 struct componentname *cnp; 2147 { 2148 struct inode *ip, *pdir; 2149 struct direct newdir; 2150 struct vnode *tvp; 2151 #ifdef UFS_ACL 2152 struct acl *acl; 2153 #endif 2154 int error; 2155 2156 pdir = VTOI(dvp); 2157 #ifdef DIAGNOSTIC 2158 if ((cnp->cn_flags & HASBUF) == 0) 2159 panic("ufs_makeinode: no name"); 2160 #endif 2161 *vpp = NULL; 2162 if ((mode & IFMT) == 0) 2163 mode |= IFREG; 2164 2165 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2166 if (error) 2167 return (error); 2168 ip = VTOI(tvp); 2169 ip->i_gid = pdir->i_gid; 2170 DIP_SET(ip, i_gid, pdir->i_gid); 2171 #ifdef SUIDDIR 2172 { 2173 #ifdef QUOTA 2174 struct ucred ucred, *ucp; 2175 ucp = cnp->cn_cred; 2176 #endif 2177 /* 2178 * If we are not the owner of the directory, 2179 * and we are hacking owners here, (only do this where told to) 2180 * and we are not giving it TO root, (would subvert quotas) 2181 * then go ahead and give it to the other user. 2182 * Note that this drops off the execute bits for security. 2183 */ 2184 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2185 (pdir->i_mode & ISUID) && 2186 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2187 ip->i_uid = pdir->i_uid; 2188 DIP_SET(ip, i_uid, ip->i_uid); 2189 mode &= ~07111; 2190 #ifdef QUOTA 2191 /* 2192 * Make sure the correct user gets charged 2193 * for the space. 2194 * Quickly knock up a dummy credential for the victim. 2195 * XXX This seems to never be accessed out of our 2196 * context so a stack variable is ok. 2197 */ 2198 ucred.cr_ref = 1; 2199 ucred.cr_uid = ip->i_uid; 2200 ucred.cr_ngroups = 1; 2201 ucred.cr_groups[0] = pdir->i_gid; 2202 ucp = &ucred; 2203 #endif 2204 } else { 2205 ip->i_uid = cnp->cn_cred->cr_uid; 2206 DIP_SET(ip, i_uid, ip->i_uid); 2207 } 2208 2209 #ifdef QUOTA 2210 if ((error = getinoquota(ip)) || 2211 (error = chkiq(ip, 1, ucp, 0))) { 2212 UFS_VFREE(tvp, ip->i_number, mode); 2213 vput(tvp); 2214 return (error); 2215 } 2216 #endif 2217 } 2218 #else /* !SUIDDIR */ 2219 ip->i_uid = cnp->cn_cred->cr_uid; 2220 DIP_SET(ip, i_uid, ip->i_uid); 2221 #ifdef QUOTA 2222 if ((error = getinoquota(ip)) || 2223 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2224 UFS_VFREE(tvp, ip->i_number, mode); 2225 vput(tvp); 2226 return (error); 2227 } 2228 #endif 2229 #endif /* !SUIDDIR */ 2230 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2231 #ifdef UFS_ACL 2232 acl = NULL; 2233 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 2234 MALLOC(acl, struct acl *, sizeof(*acl), M_ACL, M_WAITOK); 2235 2236 /* 2237 * Retrieve default ACL for parent, if any. 2238 */ 2239 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 2240 cnp->cn_thread); 2241 switch (error) { 2242 case 0: 2243 /* 2244 * Retrieved a default ACL, so merge mode and ACL if 2245 * necessary. 2246 */ 2247 if (acl->acl_cnt != 0) { 2248 /* 2249 * Two possible ways for default ACL to not 2250 * be present. First, the EA can be 2251 * undefined, or second, the default ACL can 2252 * be blank. If it's blank, fall through to 2253 * the it's not defined case. 2254 */ 2255 mode = acl_posix1e_newfilemode(mode, acl); 2256 ip->i_mode = mode; 2257 DIP_SET(ip, i_mode, mode); 2258 ufs_sync_acl_from_inode(ip, acl); 2259 break; 2260 } 2261 /* FALLTHROUGH */ 2262 2263 case EOPNOTSUPP: 2264 /* 2265 * Just use the mode as-is. 2266 */ 2267 ip->i_mode = mode; 2268 DIP_SET(ip, i_mode, mode); 2269 FREE(acl, M_ACL); 2270 acl = NULL; 2271 break; 2272 2273 default: 2274 UFS_VFREE(tvp, ip->i_number, mode); 2275 vput(tvp); 2276 FREE(acl, M_ACL); 2277 acl = NULL; 2278 return (error); 2279 } 2280 } else { 2281 #endif 2282 ip->i_mode = mode; 2283 DIP_SET(ip, i_mode, mode); 2284 #ifdef UFS_ACL 2285 } 2286 #endif 2287 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2288 ip->i_effnlink = 1; 2289 ip->i_nlink = 1; 2290 DIP_SET(ip, i_nlink, 1); 2291 if (DOINGSOFTDEP(tvp)) 2292 softdep_change_linkcnt(ip); 2293 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2294 suser_cred(cnp->cn_cred, SUSER_ALLOWJAIL)) { 2295 ip->i_mode &= ~ISGID; 2296 DIP_SET(ip, i_mode, ip->i_mode); 2297 } 2298 2299 if (cnp->cn_flags & ISWHITEOUT) { 2300 ip->i_flags |= UF_OPAQUE; 2301 DIP_SET(ip, i_flags, ip->i_flags); 2302 } 2303 2304 /* 2305 * Make sure inode goes to disk before directory entry. 2306 */ 2307 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2308 if (error) 2309 goto bad; 2310 #ifdef MAC 2311 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 2312 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 2313 dvp, tvp, cnp); 2314 if (error) 2315 goto bad; 2316 } 2317 #endif 2318 #ifdef UFS_ACL 2319 if (acl != NULL) { 2320 /* 2321 * XXX: If we abort now, will Soft Updates notify the extattr 2322 * code that the EAs for the file need to be released? 2323 */ 2324 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 2325 cnp->cn_thread); 2326 switch (error) { 2327 case 0: 2328 break; 2329 2330 case EOPNOTSUPP: 2331 /* 2332 * XXX: This should not happen, as EOPNOTSUPP above was 2333 * supposed to free acl. 2334 */ 2335 printf("ufs_makeinode: VOP_GETACL() but no " 2336 "VOP_SETACL()\n"); 2337 /* panic("ufs_makeinode: VOP_GETACL() but no " 2338 "VOP_SETACL()"); */ 2339 break; 2340 2341 default: 2342 FREE(acl, M_ACL); 2343 goto bad; 2344 } 2345 FREE(acl, M_ACL); 2346 } 2347 #endif /* !UFS_ACL */ 2348 ufs_makedirentry(ip, cnp, &newdir); 2349 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2350 if (error) 2351 goto bad; 2352 *vpp = tvp; 2353 return (0); 2354 2355 bad: 2356 /* 2357 * Write error occurred trying to update the inode 2358 * or the directory so must deallocate the inode. 2359 */ 2360 ip->i_effnlink = 0; 2361 ip->i_nlink = 0; 2362 DIP_SET(ip, i_nlink, 0); 2363 ip->i_flag |= IN_CHANGE; 2364 if (DOINGSOFTDEP(tvp)) 2365 softdep_change_linkcnt(ip); 2366 vput(tvp); 2367 return (error); 2368 } 2369 2370 /* Global vfs data structures for ufs. */ 2371 struct vop_vector ufs_vnodeops = { 2372 .vop_default = &default_vnodeops, 2373 .vop_fsync = VOP_PANIC, 2374 .vop_read = VOP_PANIC, 2375 .vop_reallocblks = VOP_PANIC, 2376 .vop_write = VOP_PANIC, 2377 .vop_access = ufs_access, 2378 .vop_advlock = ufs_advlock, 2379 .vop_bmap = ufs_bmap, 2380 .vop_cachedlookup = ufs_lookup, 2381 .vop_close = ufs_close, 2382 .vop_create = ufs_create, 2383 .vop_getattr = ufs_getattr, 2384 .vop_inactive = ufs_inactive, 2385 .vop_link = ufs_link, 2386 .vop_lookup = vfs_cache_lookup, 2387 .vop_mkdir = ufs_mkdir, 2388 .vop_mknod = ufs_mknod, 2389 .vop_open = ufs_open, 2390 .vop_pathconf = ufs_pathconf, 2391 .vop_poll = vop_stdpoll, 2392 .vop_print = ufs_print, 2393 .vop_readdir = ufs_readdir, 2394 .vop_readlink = ufs_readlink, 2395 .vop_reclaim = ufs_reclaim, 2396 .vop_remove = ufs_remove, 2397 .vop_rename = ufs_rename, 2398 .vop_rmdir = ufs_rmdir, 2399 .vop_setattr = ufs_setattr, 2400 #ifdef MAC 2401 .vop_setlabel = vop_stdsetlabel_ea, 2402 #endif 2403 .vop_strategy = ufs_strategy, 2404 .vop_symlink = ufs_symlink, 2405 .vop_whiteout = ufs_whiteout, 2406 #ifdef UFS_EXTATTR 2407 .vop_getextattr = ufs_getextattr, 2408 .vop_deleteextattr = ufs_deleteextattr, 2409 .vop_setextattr = ufs_setextattr, 2410 #endif 2411 #ifdef UFS_ACL 2412 .vop_getacl = ufs_getacl, 2413 .vop_setacl = ufs_setacl, 2414 .vop_aclcheck = ufs_aclcheck, 2415 #endif 2416 }; 2417 2418 struct vop_vector ufs_fifoops = { 2419 .vop_default = &fifo_specops, 2420 .vop_fsync = VOP_PANIC, 2421 .vop_access = ufs_access, 2422 .vop_close = ufsfifo_close, 2423 .vop_getattr = ufs_getattr, 2424 .vop_inactive = ufs_inactive, 2425 .vop_kqfilter = ufsfifo_kqfilter, 2426 .vop_print = ufs_print, 2427 .vop_read = VOP_PANIC, 2428 .vop_reclaim = ufs_reclaim, 2429 .vop_setattr = ufs_setattr, 2430 #ifdef MAC 2431 .vop_setlabel = vop_stdsetlabel_ea, 2432 #endif 2433 .vop_write = VOP_PANIC, 2434 #ifdef UFS_EXTATTR 2435 .vop_getextattr = ufs_getextattr, 2436 .vop_deleteextattr = ufs_deleteextattr, 2437 .vop_setextattr = ufs_setextattr, 2438 #endif 2439 #ifdef UFS_ACL 2440 .vop_getacl = ufs_getacl, 2441 .vop_setacl = ufs_setacl, 2442 .vop_aclcheck = ufs_aclcheck, 2443 #endif 2444 };
Cache object: e746b93639754882092c5013ce00a326
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]