ufs_vnops.c revision 132653
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: head/sys/ufs/ufs/ufs_vnops.c 132653 2004-07-26 07:24:04Z cperciva $"); 39 40#include "opt_mac.h" 41#include "opt_quota.h" 42#include "opt_suiddir.h" 43#include "opt_ufs.h" 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/malloc.h> 48#include <sys/namei.h> 49#include <sys/kernel.h> 50#include <sys/fcntl.h> 51#include <sys/stat.h> 52#include <sys/bio.h> 53#include <sys/buf.h> 54#include <sys/mount.h> 55#include <sys/unistd.h> 56#include <sys/vnode.h> 57#include <sys/dirent.h> 58#include <sys/lockf.h> 59#include <sys/event.h> 60#include <sys/conf.h> 61#include <sys/acl.h> 62#include <sys/mac.h> 63 64#include <machine/mutex.h> 65 66#include <sys/file.h> /* XXX */ 67 68#include <vm/vm.h> 69#include <vm/vm_extern.h> 70 71#include <fs/fifofs/fifo.h> 72 73#include <ufs/ufs/acl.h> 74#include <ufs/ufs/extattr.h> 75#include <ufs/ufs/quota.h> 76#include <ufs/ufs/inode.h> 77#include <ufs/ufs/dir.h> 78#include <ufs/ufs/ufsmount.h> 79#include <ufs/ufs/ufs_extern.h> 80#ifdef UFS_DIRHASH 81#include <ufs/ufs/dirhash.h> 82#endif 83 84static int ufs_access(struct vop_access_args *); 85static int ufs_advlock(struct vop_advlock_args *); 86static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *); 87static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *); 88static int ufs_close(struct vop_close_args *); 89static int ufs_create(struct vop_create_args *); 90static int ufs_getattr(struct vop_getattr_args *); 91static int ufs_link(struct vop_link_args *); 92static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 93static int ufs_mkdir(struct vop_mkdir_args *); 94static int ufs_mknod(struct vop_mknod_args *); 95static int ufs_open(struct vop_open_args *); 96static int ufs_pathconf(struct vop_pathconf_args *); 97static int ufs_lock(struct vop_lock_args *); 98static int ufs_print(struct vop_print_args *); 99static int ufs_readlink(struct vop_readlink_args *); 100static int ufs_remove(struct vop_remove_args *); 101static int ufs_rename(struct vop_rename_args *); 102static int ufs_rmdir(struct vop_rmdir_args *); 103static int ufs_setattr(struct vop_setattr_args *); 104static int ufs_strategy(struct vop_strategy_args *); 105static int ufs_symlink(struct vop_symlink_args *); 106static int ufs_whiteout(struct vop_whiteout_args *); 107static int ufsfifo_close(struct vop_close_args *); 108static int ufsfifo_kqfilter(struct vop_kqfilter_args *); 109static int ufsfifo_read(struct vop_read_args *); 110static int ufsfifo_write(struct vop_write_args *); 111static int ufsspec_close(struct vop_close_args *); 112static int ufsspec_read(struct vop_read_args *); 113static int ufsspec_write(struct vop_write_args *); 114static int filt_ufsread(struct knote *kn, long hint); 115static int filt_ufswrite(struct knote *kn, long hint); 116static int filt_ufsvnode(struct knote *kn, long hint); 117static void filt_ufsdetach(struct knote *kn); 118static int ufs_kqfilter(struct vop_kqfilter_args *ap); 119 120union _qcvt { 121 int64_t qcvt; 122 int32_t val[2]; 123}; 124#define SETHIGH(q, h) { \ 125 union _qcvt tmp; \ 126 tmp.qcvt = (q); \ 127 tmp.val[_QUAD_HIGHWORD] = (h); \ 128 (q) = tmp.qcvt; \ 129} 130#define SETLOW(q, l) { \ 131 union _qcvt tmp; \ 132 tmp.qcvt = (q); \ 133 tmp.val[_QUAD_LOWWORD] = (l); \ 134 (q) = tmp.qcvt; \ 135} 136 137/* 138 * A virgin directory (no blushing please). 139 */ 140static struct dirtemplate mastertemplate = { 141 0, 12, DT_DIR, 1, ".", 142 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." 143}; 144static struct odirtemplate omastertemplate = { 145 0, 12, 1, ".", 146 0, DIRBLKSIZ - 12, 2, ".." 147}; 148 149void 150ufs_itimes(vp) 151 struct vnode *vp; 152{ 153 struct inode *ip; 154 struct timespec ts; 155 156 ip = VTOI(vp); 157 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 158 return; 159 if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp)) 160 ip->i_flag |= IN_LAZYMOD; 161 else 162 ip->i_flag |= IN_MODIFIED; 163 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 164 vfs_timestamp(&ts); 165 if (ip->i_flag & IN_ACCESS) { 166 DIP(ip, i_atime) = ts.tv_sec; 167 DIP(ip, i_atimensec) = ts.tv_nsec; 168 } 169 if (ip->i_flag & IN_UPDATE) { 170 DIP(ip, i_mtime) = ts.tv_sec; 171 DIP(ip, i_mtimensec) = ts.tv_nsec; 172 ip->i_modrev++; 173 } 174 if (ip->i_flag & IN_CHANGE) { 175 DIP(ip, i_ctime) = ts.tv_sec; 176 DIP(ip, i_ctimensec) = ts.tv_nsec; 177 } 178 } 179 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 180} 181 182/* 183 * Create a regular file 184 */ 185static int 186ufs_create(ap) 187 struct vop_create_args /* { 188 struct vnode *a_dvp; 189 struct vnode **a_vpp; 190 struct componentname *a_cnp; 191 struct vattr *a_vap; 192 } */ *ap; 193{ 194 int error; 195 196 error = 197 ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 198 ap->a_dvp, ap->a_vpp, ap->a_cnp); 199 if (error) 200 return (error); 201 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 202 return (0); 203} 204 205/* 206 * Mknod vnode call 207 */ 208/* ARGSUSED */ 209static int 210ufs_mknod(ap) 211 struct vop_mknod_args /* { 212 struct vnode *a_dvp; 213 struct vnode **a_vpp; 214 struct componentname *a_cnp; 215 struct vattr *a_vap; 216 } */ *ap; 217{ 218 struct vattr *vap = ap->a_vap; 219 struct vnode **vpp = ap->a_vpp; 220 struct inode *ip; 221 ino_t ino; 222 int error; 223 224 error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 225 ap->a_dvp, vpp, ap->a_cnp); 226 if (error) 227 return (error); 228 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 229 ip = VTOI(*vpp); 230 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 231 if (vap->va_rdev != VNOVAL) { 232 /* 233 * Want to be able to use this to make badblock 234 * inodes, so don't truncate the dev number. 235 */ 236 DIP(ip, i_rdev) = vap->va_rdev; 237 } 238 /* 239 * Remove inode, then reload it through VFS_VGET so it is 240 * checked to see if it is an alias of an existing entry in 241 * the inode cache. 242 */ 243 vput(*vpp); 244 (*vpp)->v_type = VNON; 245 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 246 vgone(*vpp); 247 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 248 if (error) { 249 *vpp = NULL; 250 return (error); 251 } 252 return (0); 253} 254 255/* 256 * Open called. 257 * 258 * Nothing to do. 259 */ 260/* ARGSUSED */ 261static int 262ufs_open(ap) 263 struct vop_open_args /* { 264 struct vnode *a_vp; 265 int a_mode; 266 struct ucred *a_cred; 267 struct thread *a_td; 268 } */ *ap; 269{ 270 271 /* 272 * Files marked append-only must be opened for appending. 273 */ 274 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 275 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 276 return (EPERM); 277 return (0); 278} 279 280/* 281 * Close called. 282 * 283 * Update the times on the inode. 284 */ 285/* ARGSUSED */ 286static int 287ufs_close(ap) 288 struct vop_close_args /* { 289 struct vnode *a_vp; 290 int a_fflag; 291 struct ucred *a_cred; 292 struct thread *a_td; 293 } */ *ap; 294{ 295 struct vnode *vp = ap->a_vp; 296 struct mount *mp; 297 298 VI_LOCK(vp); 299 if (vp->v_usecount > 1) { 300 ufs_itimes(vp); 301 VI_UNLOCK(vp); 302 } else { 303 VI_UNLOCK(vp); 304 /* 305 * If we are closing the last reference to an unlinked 306 * file, then it will be freed by the inactive routine. 307 * Because the freeing causes a the filesystem to be 308 * modified, it must be held up during periods when the 309 * filesystem is suspended. 310 * 311 * XXX - EAGAIN is returned to prevent vn_close from 312 * repeating the vrele operation. 313 */ 314 if (vp->v_type == VREG && VTOI(vp)->i_effnlink == 0) { 315 (void) vn_start_write(vp, &mp, V_WAIT); 316 vrele(vp); 317 vn_finished_write(mp); 318 return (EAGAIN); 319 } 320 } 321 return (0); 322} 323 324static int 325ufs_access(ap) 326 struct vop_access_args /* { 327 struct vnode *a_vp; 328 int a_mode; 329 struct ucred *a_cred; 330 struct thread *a_td; 331 } */ *ap; 332{ 333 struct vnode *vp = ap->a_vp; 334 struct inode *ip = VTOI(vp); 335 mode_t mode = ap->a_mode; 336 int error; 337#ifdef UFS_ACL 338 struct acl *acl; 339#endif 340 341 /* 342 * Disallow write attempts on read-only filesystems; 343 * unless the file is a socket, fifo, or a block or 344 * character device resident on the filesystem. 345 */ 346 if (mode & VWRITE) { 347 switch (vp->v_type) { 348 case VDIR: 349 case VLNK: 350 case VREG: 351 if (vp->v_mount->mnt_flag & MNT_RDONLY) 352 return (EROFS); 353#ifdef QUOTA 354 if ((error = getinoquota(ip)) != 0) 355 return (error); 356#endif 357 break; 358 default: 359 break; 360 } 361 } 362 363 /* If immutable bit set, nobody gets to write it. */ 364 if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT))) 365 return (EPERM); 366 367#ifdef UFS_ACL 368 if ((vp->v_mount->mnt_flag & MNT_ACLS) != 0) { 369 MALLOC(acl, struct acl *, sizeof(*acl), M_ACL, M_WAITOK); 370 error = VOP_GETACL(vp, ACL_TYPE_ACCESS, acl, ap->a_cred, 371 ap->a_td); 372 switch (error) { 373 case EOPNOTSUPP: 374 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 375 ip->i_gid, ap->a_mode, ap->a_cred, NULL); 376 break; 377 case 0: 378 error = vaccess_acl_posix1e(vp->v_type, ip->i_uid, 379 ip->i_gid, acl, ap->a_mode, ap->a_cred, NULL); 380 break; 381 default: 382 printf( 383"ufs_access(): Error retrieving ACL on object (%d).\n", 384 error); 385 /* 386 * XXX: Fall back until debugged. Should 387 * eventually possibly log an error, and return 388 * EPERM for safety. 389 */ 390 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, 391 ip->i_gid, ap->a_mode, ap->a_cred, NULL); 392 } 393 FREE(acl, M_ACL); 394 } else 395#endif /* !UFS_ACL */ 396 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 397 ap->a_mode, ap->a_cred, NULL); 398 return (error); 399} 400 401/* ARGSUSED */ 402static int 403ufs_getattr(ap) 404 struct vop_getattr_args /* { 405 struct vnode *a_vp; 406 struct vattr *a_vap; 407 struct ucred *a_cred; 408 struct thread *a_td; 409 } */ *ap; 410{ 411 struct vnode *vp = ap->a_vp; 412 struct inode *ip = VTOI(vp); 413 struct vattr *vap = ap->a_vap; 414 415 ufs_itimes(vp); 416 /* 417 * Copy from inode table 418 */ 419 vap->va_fsid = dev2udev(ip->i_dev); 420 vap->va_fileid = ip->i_number; 421 vap->va_mode = ip->i_mode & ~IFMT; 422 vap->va_nlink = ip->i_effnlink; 423 vap->va_uid = ip->i_uid; 424 vap->va_gid = ip->i_gid; 425 if (ip->i_ump->um_fstype == UFS1) { 426 vap->va_rdev = ip->i_din1->di_rdev; 427 vap->va_size = ip->i_din1->di_size; 428 vap->va_atime.tv_sec = ip->i_din1->di_atime; 429 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec; 430 vap->va_mtime.tv_sec = ip->i_din1->di_mtime; 431 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec; 432 vap->va_ctime.tv_sec = ip->i_din1->di_ctime; 433 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec; 434 vap->va_birthtime.tv_sec = 0; 435 vap->va_birthtime.tv_nsec = 0; 436 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks); 437 } else { 438 vap->va_rdev = ip->i_din2->di_rdev; 439 vap->va_size = ip->i_din2->di_size; 440 vap->va_atime.tv_sec = ip->i_din2->di_atime; 441 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec; 442 vap->va_mtime.tv_sec = ip->i_din2->di_mtime; 443 vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec; 444 vap->va_ctime.tv_sec = ip->i_din2->di_ctime; 445 vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec; 446 vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime; 447 vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec; 448 vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks); 449 } 450 vap->va_flags = ip->i_flags; 451 vap->va_gen = ip->i_gen; 452 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 453 vap->va_type = IFTOVT(ip->i_mode); 454 vap->va_filerev = ip->i_modrev; 455 return (0); 456} 457 458/* 459 * Set attribute vnode op. called from several syscalls 460 */ 461static int 462ufs_setattr(ap) 463 struct vop_setattr_args /* { 464 struct vnode *a_vp; 465 struct vattr *a_vap; 466 struct ucred *a_cred; 467 struct thread *a_td; 468 } */ *ap; 469{ 470 struct vattr *vap = ap->a_vap; 471 struct vnode *vp = ap->a_vp; 472 struct inode *ip = VTOI(vp); 473 struct ucred *cred = ap->a_cred; 474 struct thread *td = ap->a_td; 475 int error; 476 477 /* 478 * Check for unsettable attributes. 479 */ 480 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 481 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 482 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 483 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 484 return (EINVAL); 485 } 486 if (vap->va_flags != VNOVAL) { 487 if (vp->v_mount->mnt_flag & MNT_RDONLY) 488 return (EROFS); 489 /* 490 * Callers may only modify the file flags on objects they 491 * have VADMIN rights for. 492 */ 493 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 494 return (error); 495 /* 496 * Unprivileged processes and privileged processes in 497 * jail() are not permitted to unset system flags, or 498 * modify flags if any system flags are set. 499 * Privileged non-jail processes may not modify system flags 500 * if securelevel > 0 and any existing system flags are set. 501 */ 502 if (!suser_cred(cred, SUSER_ALLOWJAIL)) { 503 if (ip->i_flags 504 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 505 error = securelevel_gt(cred, 0); 506 if (error) 507 return (error); 508 } 509 /* Snapshot flag cannot be set or cleared */ 510 if (((vap->va_flags & SF_SNAPSHOT) != 0 && 511 (ip->i_flags & SF_SNAPSHOT) == 0) || 512 ((vap->va_flags & SF_SNAPSHOT) == 0 && 513 (ip->i_flags & SF_SNAPSHOT) != 0)) 514 return (EPERM); 515 ip->i_flags = vap->va_flags; 516 DIP(ip, i_flags) = vap->va_flags; 517 } else { 518 if (ip->i_flags 519 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 520 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 521 return (EPERM); 522 ip->i_flags &= SF_SETTABLE; 523 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 524 DIP(ip, i_flags) = ip->i_flags; 525 } 526 ip->i_flag |= IN_CHANGE; 527 if (vap->va_flags & (IMMUTABLE | APPEND)) 528 return (0); 529 } 530 if (ip->i_flags & (IMMUTABLE | APPEND)) 531 return (EPERM); 532 /* 533 * Go through the fields and update iff not VNOVAL. 534 */ 535 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 536 if (vp->v_mount->mnt_flag & MNT_RDONLY) 537 return (EROFS); 538 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, 539 td)) != 0) 540 return (error); 541 } 542 if (vap->va_size != VNOVAL) { 543 /* 544 * Disallow write attempts on read-only filesystems; 545 * unless the file is a socket, fifo, or a block or 546 * character device resident on the filesystem. 547 */ 548 switch (vp->v_type) { 549 case VDIR: 550 return (EISDIR); 551 case VLNK: 552 case VREG: 553 if (vp->v_mount->mnt_flag & MNT_RDONLY) 554 return (EROFS); 555 if ((ip->i_flags & SF_SNAPSHOT) != 0) 556 return (EPERM); 557 break; 558 default: 559 break; 560 } 561 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL, 562 cred, td)) != 0) 563 return (error); 564 } 565 if (vap->va_atime.tv_sec != VNOVAL || 566 vap->va_mtime.tv_sec != VNOVAL || 567 vap->va_birthtime.tv_sec != VNOVAL) { 568 if (vp->v_mount->mnt_flag & MNT_RDONLY) 569 return (EROFS); 570 if ((ip->i_flags & SF_SNAPSHOT) != 0) 571 return (EPERM); 572 /* 573 * From utimes(2): 574 * If times is NULL, ... The caller must be the owner of 575 * the file, have permission to write the file, or be the 576 * super-user. 577 * If times is non-NULL, ... The caller must be the owner of 578 * the file or be the super-user. 579 */ 580 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 581 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 582 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 583 return (error); 584 if (vap->va_atime.tv_sec != VNOVAL) 585 ip->i_flag |= IN_ACCESS; 586 if (vap->va_mtime.tv_sec != VNOVAL) 587 ip->i_flag |= IN_CHANGE | IN_UPDATE; 588 if (vap->va_birthtime.tv_sec != VNOVAL && 589 ip->i_ump->um_fstype == UFS2) 590 ip->i_flag |= IN_MODIFIED; 591 ufs_itimes(vp); 592 if (vap->va_atime.tv_sec != VNOVAL) { 593 DIP(ip, i_atime) = vap->va_atime.tv_sec; 594 DIP(ip, i_atimensec) = vap->va_atime.tv_nsec; 595 } 596 if (vap->va_mtime.tv_sec != VNOVAL) { 597 DIP(ip, i_mtime) = vap->va_mtime.tv_sec; 598 DIP(ip, i_mtimensec) = vap->va_mtime.tv_nsec; 599 } 600 if (vap->va_birthtime.tv_sec != VNOVAL && 601 ip->i_ump->um_fstype == UFS2) { 602 ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec; 603 ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec; 604 } 605 error = UFS_UPDATE(vp, 0); 606 if (error) 607 return (error); 608 } 609 error = 0; 610 if (vap->va_mode != (mode_t)VNOVAL) { 611 if (vp->v_mount->mnt_flag & MNT_RDONLY) 612 return (EROFS); 613 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode & 614 (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH))) 615 return (EPERM); 616 error = ufs_chmod(vp, (int)vap->va_mode, cred, td); 617 } 618 VN_KNOTE(vp, NOTE_ATTRIB); 619 return (error); 620} 621 622/* 623 * Change the mode on a file. 624 * Inode must be locked before calling. 625 */ 626static int 627ufs_chmod(vp, mode, cred, td) 628 struct vnode *vp; 629 int mode; 630 struct ucred *cred; 631 struct thread *td; 632{ 633 struct inode *ip = VTOI(vp); 634 int error; 635 636 /* 637 * To modify the permissions on a file, must possess VADMIN 638 * for that file. 639 */ 640 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 641 return (error); 642 /* 643 * Privileged processes may set the sticky bit on non-directories, 644 * as well as set the setgid bit on a file with a group that the 645 * process is not a member of. Both of these are allowed in 646 * jail(8). 647 */ 648 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 649 if (suser_cred(cred, SUSER_ALLOWJAIL)) 650 return (EFTYPE); 651 } 652 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 653 error = suser_cred(cred, SUSER_ALLOWJAIL); 654 if (error) 655 return (error); 656 } 657 ip->i_mode &= ~ALLPERMS; 658 ip->i_mode |= (mode & ALLPERMS); 659 DIP(ip, i_mode) = ip->i_mode; 660 ip->i_flag |= IN_CHANGE; 661 return (0); 662} 663 664/* 665 * Perform chown operation on inode ip; 666 * inode must be locked prior to call. 667 */ 668static int 669ufs_chown(vp, uid, gid, cred, td) 670 struct vnode *vp; 671 uid_t uid; 672 gid_t gid; 673 struct ucred *cred; 674 struct thread *td; 675{ 676 struct inode *ip = VTOI(vp); 677 uid_t ouid; 678 gid_t ogid; 679 int error = 0; 680#ifdef QUOTA 681 int i; 682 ufs2_daddr_t change; 683#endif 684 685 if (uid == (uid_t)VNOVAL) 686 uid = ip->i_uid; 687 if (gid == (gid_t)VNOVAL) 688 gid = ip->i_gid; 689 /* 690 * To modify the ownership of a file, must possess VADMIN 691 * for that file. 692 */ 693 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 694 return (error); 695 /* 696 * To change the owner of a file, or change the group of a file 697 * to a group of which we are not a member, the caller must 698 * have privilege. 699 */ 700 if ((uid != ip->i_uid || 701 (gid != ip->i_gid && !groupmember(gid, cred))) && 702 (error = suser_cred(cred, SUSER_ALLOWJAIL))) 703 return (error); 704 ogid = ip->i_gid; 705 ouid = ip->i_uid; 706#ifdef QUOTA 707 if ((error = getinoquota(ip)) != 0) 708 return (error); 709 if (ouid == uid) { 710 dqrele(vp, ip->i_dquot[USRQUOTA]); 711 ip->i_dquot[USRQUOTA] = NODQUOT; 712 } 713 if (ogid == gid) { 714 dqrele(vp, ip->i_dquot[GRPQUOTA]); 715 ip->i_dquot[GRPQUOTA] = NODQUOT; 716 } 717 change = DIP(ip, i_blocks); 718 (void) chkdq(ip, -change, cred, CHOWN); 719 (void) chkiq(ip, -1, cred, CHOWN); 720 for (i = 0; i < MAXQUOTAS; i++) { 721 dqrele(vp, ip->i_dquot[i]); 722 ip->i_dquot[i] = NODQUOT; 723 } 724#endif 725 ip->i_gid = gid; 726 DIP(ip, i_gid) = gid; 727 ip->i_uid = uid; 728 DIP(ip, i_uid) = uid; 729#ifdef QUOTA 730 if ((error = getinoquota(ip)) == 0) { 731 if (ouid == uid) { 732 dqrele(vp, ip->i_dquot[USRQUOTA]); 733 ip->i_dquot[USRQUOTA] = NODQUOT; 734 } 735 if (ogid == gid) { 736 dqrele(vp, ip->i_dquot[GRPQUOTA]); 737 ip->i_dquot[GRPQUOTA] = NODQUOT; 738 } 739 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { 740 if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) 741 goto good; 742 else 743 (void) chkdq(ip, -change, cred, CHOWN|FORCE); 744 } 745 for (i = 0; i < MAXQUOTAS; i++) { 746 dqrele(vp, ip->i_dquot[i]); 747 ip->i_dquot[i] = NODQUOT; 748 } 749 } 750 ip->i_gid = ogid; 751 DIP(ip, i_gid) = ogid; 752 ip->i_uid = ouid; 753 DIP(ip, i_uid) = ouid; 754 if (getinoquota(ip) == 0) { 755 if (ouid == uid) { 756 dqrele(vp, ip->i_dquot[USRQUOTA]); 757 ip->i_dquot[USRQUOTA] = NODQUOT; 758 } 759 if (ogid == gid) { 760 dqrele(vp, ip->i_dquot[GRPQUOTA]); 761 ip->i_dquot[GRPQUOTA] = NODQUOT; 762 } 763 (void) chkdq(ip, change, cred, FORCE|CHOWN); 764 (void) chkiq(ip, 1, cred, FORCE|CHOWN); 765 (void) getinoquota(ip); 766 } 767 return (error); 768good: 769 if (getinoquota(ip)) 770 panic("ufs_chown: lost quota"); 771#endif /* QUOTA */ 772 ip->i_flag |= IN_CHANGE; 773 if (suser_cred(cred, SUSER_ALLOWJAIL) && (ouid != uid || ogid != gid)) { 774 ip->i_mode &= ~(ISUID | ISGID); 775 DIP(ip, i_mode) = ip->i_mode; 776 } 777 return (0); 778} 779 780static int 781ufs_remove(ap) 782 struct vop_remove_args /* { 783 struct vnode *a_dvp; 784 struct vnode *a_vp; 785 struct componentname *a_cnp; 786 } */ *ap; 787{ 788 struct inode *ip; 789 struct vnode *vp = ap->a_vp; 790 struct vnode *dvp = ap->a_dvp; 791 int error; 792 793 ip = VTOI(vp); 794 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 795 (VTOI(dvp)->i_flags & APPEND)) { 796 error = EPERM; 797 goto out; 798 } 799 error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0); 800 if (ip->i_nlink <= 0) 801 vp->v_vflag |= VV_NOSYNC; 802 VN_KNOTE(vp, NOTE_DELETE); 803 VN_KNOTE(dvp, NOTE_WRITE); 804out: 805 return (error); 806} 807 808/* 809 * link vnode call 810 */ 811static int 812ufs_link(ap) 813 struct vop_link_args /* { 814 struct vnode *a_tdvp; 815 struct vnode *a_vp; 816 struct componentname *a_cnp; 817 } */ *ap; 818{ 819 struct vnode *vp = ap->a_vp; 820 struct vnode *tdvp = ap->a_tdvp; 821 struct componentname *cnp = ap->a_cnp; 822 struct inode *ip; 823 struct direct newdir; 824 int error; 825 826#ifdef DIAGNOSTIC 827 if ((cnp->cn_flags & HASBUF) == 0) 828 panic("ufs_link: no name"); 829#endif 830 if (tdvp->v_mount != vp->v_mount) { 831 error = EXDEV; 832 goto out; 833 } 834 ip = VTOI(vp); 835 if ((nlink_t)ip->i_nlink >= LINK_MAX) { 836 error = EMLINK; 837 goto out; 838 } 839 if (ip->i_flags & (IMMUTABLE | APPEND)) { 840 error = EPERM; 841 goto out; 842 } 843 ip->i_effnlink++; 844 ip->i_nlink++; 845 DIP(ip, i_nlink) = ip->i_nlink; 846 ip->i_flag |= IN_CHANGE; 847 if (DOINGSOFTDEP(vp)) 848 softdep_change_linkcnt(ip); 849 error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp))); 850 if (!error) { 851 ufs_makedirentry(ip, cnp, &newdir); 852 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL); 853 } 854 855 if (error) { 856 ip->i_effnlink--; 857 ip->i_nlink--; 858 DIP(ip, i_nlink) = ip->i_nlink; 859 ip->i_flag |= IN_CHANGE; 860 if (DOINGSOFTDEP(vp)) 861 softdep_change_linkcnt(ip); 862 } 863out: 864 VN_KNOTE(vp, NOTE_LINK); 865 VN_KNOTE(tdvp, NOTE_WRITE); 866 return (error); 867} 868 869/* 870 * whiteout vnode call 871 */ 872static int 873ufs_whiteout(ap) 874 struct vop_whiteout_args /* { 875 struct vnode *a_dvp; 876 struct componentname *a_cnp; 877 int a_flags; 878 } */ *ap; 879{ 880 struct vnode *dvp = ap->a_dvp; 881 struct componentname *cnp = ap->a_cnp; 882 struct direct newdir; 883 int error = 0; 884 885 switch (ap->a_flags) { 886 case LOOKUP: 887 /* 4.4 format directories support whiteout operations */ 888 if (dvp->v_mount->mnt_maxsymlinklen > 0) 889 return (0); 890 return (EOPNOTSUPP); 891 892 case CREATE: 893 /* create a new directory whiteout */ 894#ifdef DIAGNOSTIC 895 if ((cnp->cn_flags & SAVENAME) == 0) 896 panic("ufs_whiteout: missing name"); 897 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 898 panic("ufs_whiteout: old format filesystem"); 899#endif 900 901 newdir.d_ino = WINO; 902 newdir.d_namlen = cnp->cn_namelen; 903 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1); 904 newdir.d_type = DT_WHT; 905 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL); 906 break; 907 908 case DELETE: 909 /* remove an existing directory whiteout */ 910#ifdef DIAGNOSTIC 911 if (dvp->v_mount->mnt_maxsymlinklen <= 0) 912 panic("ufs_whiteout: old format filesystem"); 913#endif 914 915 cnp->cn_flags &= ~DOWHITEOUT; 916 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0); 917 break; 918 default: 919 panic("ufs_whiteout: unknown op"); 920 } 921 return (error); 922} 923 924/* 925 * Rename system call. 926 * rename("foo", "bar"); 927 * is essentially 928 * unlink("bar"); 929 * link("foo", "bar"); 930 * unlink("foo"); 931 * but ``atomically''. Can't do full commit without saving state in the 932 * inode on disk which isn't feasible at this time. Best we can do is 933 * always guarantee the target exists. 934 * 935 * Basic algorithm is: 936 * 937 * 1) Bump link count on source while we're linking it to the 938 * target. This also ensure the inode won't be deleted out 939 * from underneath us while we work (it may be truncated by 940 * a concurrent `trunc' or `open' for creation). 941 * 2) Link source to destination. If destination already exists, 942 * delete it first. 943 * 3) Unlink source reference to inode if still around. If a 944 * directory was moved and the parent of the destination 945 * is different from the source, patch the ".." entry in the 946 * directory. 947 */ 948static int 949ufs_rename(ap) 950 struct vop_rename_args /* { 951 struct vnode *a_fdvp; 952 struct vnode *a_fvp; 953 struct componentname *a_fcnp; 954 struct vnode *a_tdvp; 955 struct vnode *a_tvp; 956 struct componentname *a_tcnp; 957 } */ *ap; 958{ 959 struct vnode *tvp = ap->a_tvp; 960 struct vnode *tdvp = ap->a_tdvp; 961 struct vnode *fvp = ap->a_fvp; 962 struct vnode *fdvp = ap->a_fdvp; 963 struct componentname *tcnp = ap->a_tcnp; 964 struct componentname *fcnp = ap->a_fcnp; 965 struct thread *td = fcnp->cn_thread; 966 struct inode *ip, *xp, *dp; 967 struct direct newdir; 968 int doingdirectory = 0, oldparent = 0, newparent = 0; 969 int error = 0, ioflag; 970 971#ifdef DIAGNOSTIC 972 if ((tcnp->cn_flags & HASBUF) == 0 || 973 (fcnp->cn_flags & HASBUF) == 0) 974 panic("ufs_rename: no name"); 975#endif 976 /* 977 * Check for cross-device rename. 978 */ 979 if ((fvp->v_mount != tdvp->v_mount) || 980 (tvp && (fvp->v_mount != tvp->v_mount))) { 981 error = EXDEV; 982abortit: 983 if (tdvp == tvp) 984 vrele(tdvp); 985 else 986 vput(tdvp); 987 if (tvp) 988 vput(tvp); 989 vrele(fdvp); 990 vrele(fvp); 991 return (error); 992 } 993 994 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 995 (VTOI(tdvp)->i_flags & APPEND))) { 996 error = EPERM; 997 goto abortit; 998 } 999 1000 /* 1001 * Renaming a file to itself has no effect. The upper layers should 1002 * not call us in that case. Temporarily just warn if they do. 1003 */ 1004 if (fvp == tvp) { 1005 printf("ufs_rename: fvp == tvp (can't happen)\n"); 1006 error = 0; 1007 goto abortit; 1008 } 1009 1010 if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0) 1011 goto abortit; 1012 dp = VTOI(fdvp); 1013 ip = VTOI(fvp); 1014 if (ip->i_nlink >= LINK_MAX) { 1015 VOP_UNLOCK(fvp, 0, td); 1016 error = EMLINK; 1017 goto abortit; 1018 } 1019 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1020 || (dp->i_flags & APPEND)) { 1021 VOP_UNLOCK(fvp, 0, td); 1022 error = EPERM; 1023 goto abortit; 1024 } 1025 if ((ip->i_mode & IFMT) == IFDIR) { 1026 /* 1027 * Avoid ".", "..", and aliases of "." for obvious reasons. 1028 */ 1029 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 1030 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 1031 (ip->i_flag & IN_RENAME)) { 1032 VOP_UNLOCK(fvp, 0, td); 1033 error = EINVAL; 1034 goto abortit; 1035 } 1036 ip->i_flag |= IN_RENAME; 1037 oldparent = dp->i_number; 1038 doingdirectory = 1; 1039 } 1040 VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */ 1041 vrele(fdvp); 1042 1043 /* 1044 * When the target exists, both the directory 1045 * and target vnodes are returned locked. 1046 */ 1047 dp = VTOI(tdvp); 1048 xp = NULL; 1049 if (tvp) 1050 xp = VTOI(tvp); 1051 1052 /* 1053 * 1) Bump link count while we're moving stuff 1054 * around. If we crash somewhere before 1055 * completing our work, the link count 1056 * may be wrong, but correctable. 1057 */ 1058 ip->i_effnlink++; 1059 ip->i_nlink++; 1060 DIP(ip, i_nlink) = ip->i_nlink; 1061 ip->i_flag |= IN_CHANGE; 1062 if (DOINGSOFTDEP(fvp)) 1063 softdep_change_linkcnt(ip); 1064 if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | 1065 DOINGASYNC(fvp)))) != 0) { 1066 VOP_UNLOCK(fvp, 0, td); 1067 goto bad; 1068 } 1069 1070 /* 1071 * If ".." must be changed (ie the directory gets a new 1072 * parent) then the source directory must not be in the 1073 * directory heirarchy above the target, as this would 1074 * orphan everything below the source directory. Also 1075 * the user must have write permission in the source so 1076 * as to be able to change "..". We must repeat the call 1077 * to namei, as the parent directory is unlocked by the 1078 * call to checkpath(). 1079 */ 1080 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 1081 VOP_UNLOCK(fvp, 0, td); 1082 if (oldparent != dp->i_number) 1083 newparent = dp->i_number; 1084 if (doingdirectory && newparent) { 1085 if (error) /* write access check above */ 1086 goto bad; 1087 if (xp != NULL) 1088 vput(tvp); 1089 error = ufs_checkpath(ip, dp, tcnp->cn_cred); 1090 if (error) 1091 goto out; 1092 if ((tcnp->cn_flags & SAVESTART) == 0) 1093 panic("ufs_rename: lost to startdir"); 1094 VREF(tdvp); 1095 error = relookup(tdvp, &tvp, tcnp); 1096 if (error) 1097 goto out; 1098 vrele(tdvp); 1099 dp = VTOI(tdvp); 1100 xp = NULL; 1101 if (tvp) 1102 xp = VTOI(tvp); 1103 } 1104 /* 1105 * 2) If target doesn't exist, link the target 1106 * to the source and unlink the source. 1107 * Otherwise, rewrite the target directory 1108 * entry to reference the source inode and 1109 * expunge the original entry's existence. 1110 */ 1111 if (xp == NULL) { 1112 if (dp->i_dev != ip->i_dev) 1113 panic("ufs_rename: EXDEV"); 1114 /* 1115 * Account for ".." in new directory. 1116 * When source and destination have the same 1117 * parent we don't fool with the link count. 1118 */ 1119 if (doingdirectory && newparent) { 1120 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1121 error = EMLINK; 1122 goto bad; 1123 } 1124 dp->i_effnlink++; 1125 dp->i_nlink++; 1126 DIP(dp, i_nlink) = dp->i_nlink; 1127 dp->i_flag |= IN_CHANGE; 1128 if (DOINGSOFTDEP(tdvp)) 1129 softdep_change_linkcnt(dp); 1130 error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) | 1131 DOINGASYNC(tdvp))); 1132 if (error) 1133 goto bad; 1134 } 1135 ufs_makedirentry(ip, tcnp, &newdir); 1136 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL); 1137 if (error) { 1138 if (doingdirectory && newparent) { 1139 dp->i_effnlink--; 1140 dp->i_nlink--; 1141 DIP(dp, i_nlink) = dp->i_nlink; 1142 dp->i_flag |= IN_CHANGE; 1143 if (DOINGSOFTDEP(tdvp)) 1144 softdep_change_linkcnt(dp); 1145 (void)UFS_UPDATE(tdvp, 1); 1146 } 1147 goto bad; 1148 } 1149 VN_KNOTE(tdvp, NOTE_WRITE); 1150 vput(tdvp); 1151 } else { 1152 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) 1153 panic("ufs_rename: EXDEV"); 1154 /* 1155 * Short circuit rename(foo, foo). 1156 */ 1157 if (xp->i_number == ip->i_number) 1158 panic("ufs_rename: same file"); 1159 /* 1160 * If the parent directory is "sticky", then the caller 1161 * must possess VADMIN for the parent directory, or the 1162 * destination of the rename. This implements append-only 1163 * directories. 1164 */ 1165 if ((dp->i_mode & S_ISTXT) && 1166 VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) && 1167 VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) { 1168 error = EPERM; 1169 goto bad; 1170 } 1171 /* 1172 * Target must be empty if a directory and have no links 1173 * to it. Also, ensure source and target are compatible 1174 * (both directories, or both not directories). 1175 */ 1176 if ((xp->i_mode&IFMT) == IFDIR) { 1177 if ((xp->i_effnlink > 2) || 1178 !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 1179 error = ENOTEMPTY; 1180 goto bad; 1181 } 1182 if (!doingdirectory) { 1183 error = ENOTDIR; 1184 goto bad; 1185 } 1186 cache_purge(tdvp); 1187 } else if (doingdirectory) { 1188 error = EISDIR; 1189 goto bad; 1190 } 1191 error = ufs_dirrewrite(dp, xp, ip->i_number, 1192 IFTODT(ip->i_mode), 1193 (doingdirectory && newparent) ? newparent : doingdirectory); 1194 if (error) 1195 goto bad; 1196 if (doingdirectory) { 1197 if (!newparent) { 1198 dp->i_effnlink--; 1199 if (DOINGSOFTDEP(tdvp)) 1200 softdep_change_linkcnt(dp); 1201 } 1202 xp->i_effnlink--; 1203 if (DOINGSOFTDEP(tvp)) 1204 softdep_change_linkcnt(xp); 1205 } 1206 if (doingdirectory && !DOINGSOFTDEP(tvp)) { 1207 /* 1208 * Truncate inode. The only stuff left in the directory 1209 * is "." and "..". The "." reference is inconsequential 1210 * since we are quashing it. We have removed the "." 1211 * reference and the reference in the parent directory, 1212 * but there may be other hard links. The soft 1213 * dependency code will arrange to do these operations 1214 * after the parent directory entry has been deleted on 1215 * disk, so when running with that code we avoid doing 1216 * them now. 1217 */ 1218 if (!newparent) { 1219 dp->i_nlink--; 1220 DIP(dp, i_nlink) = dp->i_nlink; 1221 dp->i_flag |= IN_CHANGE; 1222 } 1223 xp->i_nlink--; 1224 DIP(xp, i_nlink) = xp->i_nlink; 1225 xp->i_flag |= IN_CHANGE; 1226 ioflag = IO_NORMAL; 1227 if (DOINGASYNC(tvp)) 1228 ioflag |= IO_SYNC; 1229 if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag, 1230 tcnp->cn_cred, tcnp->cn_thread)) != 0) 1231 goto bad; 1232 } 1233 VN_KNOTE(tdvp, NOTE_WRITE); 1234 vput(tdvp); 1235 VN_KNOTE(tvp, NOTE_DELETE); 1236 vput(tvp); 1237 xp = NULL; 1238 } 1239 1240 /* 1241 * 3) Unlink the source. 1242 */ 1243 fcnp->cn_flags &= ~MODMASK; 1244 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1245 if ((fcnp->cn_flags & SAVESTART) == 0) 1246 panic("ufs_rename: lost from startdir"); 1247 VREF(fdvp); 1248 error = relookup(fdvp, &fvp, fcnp); 1249 if (error == 0) 1250 vrele(fdvp); 1251 if (fvp != NULL) { 1252 xp = VTOI(fvp); 1253 dp = VTOI(fdvp); 1254 } else { 1255 /* 1256 * From name has disappeared. IN_RENAME is not sufficient 1257 * to protect against directory races due to timing windows, 1258 * so we have to remove the panic. XXX the only real way 1259 * to solve this issue is at a much higher level. By the 1260 * time we hit ufs_rename() it's too late. 1261 */ 1262#if 0 1263 if (doingdirectory) 1264 panic("ufs_rename: lost dir entry"); 1265#endif 1266 vrele(ap->a_fvp); 1267 return (0); 1268 } 1269 /* 1270 * Ensure that the directory entry still exists and has not 1271 * changed while the new name has been entered. If the source is 1272 * a file then the entry may have been unlinked or renamed. In 1273 * either case there is no further work to be done. If the source 1274 * is a directory then it cannot have been rmdir'ed; the IN_RENAME 1275 * flag ensures that it cannot be moved by another rename or removed 1276 * by a rmdir. 1277 */ 1278 if (xp != ip) { 1279 /* 1280 * From name resolves to a different inode. IN_RENAME is 1281 * not sufficient protection against timing window races 1282 * so we can't panic here. XXX the only real way 1283 * to solve this issue is at a much higher level. By the 1284 * time we hit ufs_rename() it's too late. 1285 */ 1286#if 0 1287 if (doingdirectory) 1288 panic("ufs_rename: lost dir entry"); 1289#endif 1290 } else { 1291 /* 1292 * If the source is a directory with a 1293 * new parent, the link count of the old 1294 * parent directory must be decremented 1295 * and ".." set to point to the new parent. 1296 */ 1297 if (doingdirectory && newparent) { 1298 xp->i_offset = mastertemplate.dot_reclen; 1299 ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0); 1300 cache_purge(fdvp); 1301 } 1302 error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0); 1303 xp->i_flag &= ~IN_RENAME; 1304 } 1305 VN_KNOTE(fvp, NOTE_RENAME); 1306 if (dp) 1307 vput(fdvp); 1308 if (xp) 1309 vput(fvp); 1310 vrele(ap->a_fvp); 1311 return (error); 1312 1313bad: 1314 if (xp) 1315 vput(ITOV(xp)); 1316 vput(ITOV(dp)); 1317out: 1318 if (doingdirectory) 1319 ip->i_flag &= ~IN_RENAME; 1320 if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) { 1321 ip->i_effnlink--; 1322 ip->i_nlink--; 1323 DIP(ip, i_nlink) = ip->i_nlink; 1324 ip->i_flag |= IN_CHANGE; 1325 ip->i_flag &= ~IN_RENAME; 1326 if (DOINGSOFTDEP(fvp)) 1327 softdep_change_linkcnt(ip); 1328 vput(fvp); 1329 } else 1330 vrele(fvp); 1331 return (error); 1332} 1333 1334/* 1335 * Mkdir system call 1336 */ 1337static int 1338ufs_mkdir(ap) 1339 struct vop_mkdir_args /* { 1340 struct vnode *a_dvp; 1341 struct vnode **a_vpp; 1342 struct componentname *a_cnp; 1343 struct vattr *a_vap; 1344 } */ *ap; 1345{ 1346 struct vnode *dvp = ap->a_dvp; 1347 struct vattr *vap = ap->a_vap; 1348 struct componentname *cnp = ap->a_cnp; 1349 struct inode *ip, *dp; 1350 struct vnode *tvp; 1351 struct buf *bp; 1352 struct dirtemplate dirtemplate, *dtp; 1353 struct direct newdir; 1354#ifdef UFS_ACL 1355 struct acl *acl, *dacl; 1356#endif 1357 int error, dmode; 1358 long blkoff; 1359 1360#ifdef DIAGNOSTIC 1361 if ((cnp->cn_flags & HASBUF) == 0) 1362 panic("ufs_mkdir: no name"); 1363#endif 1364 dp = VTOI(dvp); 1365 if ((nlink_t)dp->i_nlink >= LINK_MAX) { 1366 error = EMLINK; 1367 goto out; 1368 } 1369 dmode = vap->va_mode & 0777; 1370 dmode |= IFDIR; 1371 /* 1372 * Must simulate part of ufs_makeinode here to acquire the inode, 1373 * but not have it entered in the parent directory. The entry is 1374 * made later after writing "." and ".." entries. 1375 */ 1376 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp); 1377 if (error) 1378 goto out; 1379 ip = VTOI(tvp); 1380 ip->i_gid = dp->i_gid; 1381 DIP(ip, i_gid) = dp->i_gid; 1382#ifdef SUIDDIR 1383 { 1384#ifdef QUOTA 1385 struct ucred ucred, *ucp; 1386 ucp = cnp->cn_cred; 1387#endif 1388 /* 1389 * If we are hacking owners here, (only do this where told to) 1390 * and we are not giving it TO root, (would subvert quotas) 1391 * then go ahead and give it to the other user. 1392 * The new directory also inherits the SUID bit. 1393 * If user's UID and dir UID are the same, 1394 * 'give it away' so that the SUID is still forced on. 1395 */ 1396 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1397 (dp->i_mode & ISUID) && dp->i_uid) { 1398 dmode |= ISUID; 1399 ip->i_uid = dp->i_uid; 1400 DIP(ip, i_uid) = dp->i_uid; 1401#ifdef QUOTA 1402 if (dp->i_uid != cnp->cn_cred->cr_uid) { 1403 /* 1404 * Make sure the correct user gets charged 1405 * for the space. 1406 * Make a dummy credential for the victim. 1407 * XXX This seems to never be accessed out of 1408 * our context so a stack variable is ok. 1409 */ 1410 ucred.cr_ref = 1; 1411 ucred.cr_uid = ip->i_uid; 1412 ucred.cr_ngroups = 1; 1413 ucred.cr_groups[0] = dp->i_gid; 1414 ucp = &ucred; 1415 } 1416#endif 1417 } else { 1418 ip->i_uid = cnp->cn_cred->cr_uid; 1419 DIP(ip, i_uid) = ip->i_uid; 1420 } 1421#ifdef QUOTA 1422 if ((error = getinoquota(ip)) || 1423 (error = chkiq(ip, 1, ucp, 0))) { 1424 UFS_VFREE(tvp, ip->i_number, dmode); 1425 vput(tvp); 1426 return (error); 1427 } 1428#endif 1429 } 1430#else /* !SUIDDIR */ 1431 ip->i_uid = cnp->cn_cred->cr_uid; 1432 DIP(ip, i_uid) = ip->i_uid; 1433#ifdef QUOTA 1434 if ((error = getinoquota(ip)) || 1435 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 1436 UFS_VFREE(tvp, ip->i_number, dmode); 1437 vput(tvp); 1438 return (error); 1439 } 1440#endif 1441#endif /* !SUIDDIR */ 1442 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1443#ifdef UFS_ACL 1444 acl = dacl = NULL; 1445 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 1446 MALLOC(acl, struct acl *, sizeof(*acl), M_ACL, M_WAITOK); 1447 MALLOC(dacl, struct acl *, sizeof(*dacl), M_ACL, M_WAITOK); 1448 1449 /* 1450 * Retrieve default ACL from parent, if any. 1451 */ 1452 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 1453 cnp->cn_thread); 1454 switch (error) { 1455 case 0: 1456 /* 1457 * Retrieved a default ACL, so merge mode and ACL if 1458 * necessary. If the ACL is empty, fall through to 1459 * the "not defined or available" case. 1460 */ 1461 if (acl->acl_cnt != 0) { 1462 dmode = acl_posix1e_newfilemode(dmode, acl); 1463 ip->i_mode = dmode; 1464 DIP(ip, i_mode) = dmode; 1465 *dacl = *acl; 1466 ufs_sync_acl_from_inode(ip, acl); 1467 break; 1468 } 1469 /* FALLTHROUGH */ 1470 1471 case EOPNOTSUPP: 1472 /* 1473 * Just use the mode as-is. 1474 */ 1475 ip->i_mode = dmode; 1476 DIP(ip, i_mode) = dmode; 1477 FREE(acl, M_ACL); 1478 FREE(dacl, M_ACL); 1479 dacl = acl = NULL; 1480 break; 1481 1482 default: 1483 UFS_VFREE(tvp, ip->i_number, dmode); 1484 vput(tvp); 1485 FREE(acl, M_ACL); 1486 FREE(dacl, M_ACL); 1487 return (error); 1488 } 1489 } else { 1490#endif /* !UFS_ACL */ 1491 ip->i_mode = dmode; 1492 DIP(ip, i_mode) = dmode; 1493#ifdef UFS_ACL 1494 } 1495#endif 1496 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1497 ip->i_effnlink = 2; 1498 ip->i_nlink = 2; 1499 DIP(ip, i_nlink) = 2; 1500 if (DOINGSOFTDEP(tvp)) 1501 softdep_change_linkcnt(ip); 1502 if (cnp->cn_flags & ISWHITEOUT) { 1503 ip->i_flags |= UF_OPAQUE; 1504 DIP(ip, i_flags) = ip->i_flags; 1505 } 1506 1507 /* 1508 * Bump link count in parent directory to reflect work done below. 1509 * Should be done before reference is created so cleanup is 1510 * possible if we crash. 1511 */ 1512 dp->i_effnlink++; 1513 dp->i_nlink++; 1514 DIP(dp, i_nlink) = dp->i_nlink; 1515 dp->i_flag |= IN_CHANGE; 1516 if (DOINGSOFTDEP(dvp)) 1517 softdep_change_linkcnt(dp); 1518 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp))); 1519 if (error) 1520 goto bad; 1521#ifdef MAC 1522 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 1523 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 1524 dvp, tvp, cnp); 1525 if (error) 1526 goto bad; 1527 } 1528#endif 1529#ifdef UFS_ACL 1530 if (acl != NULL) { 1531 /* 1532 * XXX: If we abort now, will Soft Updates notify the extattr 1533 * code that the EAs for the file need to be released? 1534 */ 1535 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 1536 cnp->cn_thread); 1537 if (error == 0) 1538 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, 1539 cnp->cn_cred, cnp->cn_thread); 1540 switch (error) { 1541 case 0: 1542 break; 1543 1544 case EOPNOTSUPP: 1545 /* 1546 * XXX: This should not happen, as EOPNOTSUPP above 1547 * was supposed to free acl. 1548 */ 1549 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1550 /* 1551 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()"); 1552 */ 1553 break; 1554 1555 default: 1556 FREE(acl, M_ACL); 1557 FREE(dacl, M_ACL); 1558 goto bad; 1559 } 1560 FREE(acl, M_ACL); 1561 FREE(dacl, M_ACL); 1562 } 1563#endif /* !UFS_ACL */ 1564 1565 /* 1566 * Initialize directory with "." and ".." from static template. 1567 */ 1568 if (dvp->v_mount->mnt_maxsymlinklen > 0 1569 ) 1570 dtp = &mastertemplate; 1571 else 1572 dtp = (struct dirtemplate *)&omastertemplate; 1573 dirtemplate = *dtp; 1574 dirtemplate.dot_ino = ip->i_number; 1575 dirtemplate.dotdot_ino = dp->i_number; 1576 if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred, 1577 BA_CLRBUF, &bp)) != 0) 1578 goto bad; 1579 ip->i_size = DIRBLKSIZ; 1580 DIP(ip, i_size) = DIRBLKSIZ; 1581 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1582 vnode_pager_setsize(tvp, (u_long)ip->i_size); 1583 bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate); 1584 if (DOINGSOFTDEP(tvp)) { 1585 /* 1586 * Ensure that the entire newly allocated block is a 1587 * valid directory so that future growth within the 1588 * block does not have to ensure that the block is 1589 * written before the inode. 1590 */ 1591 blkoff = DIRBLKSIZ; 1592 while (blkoff < bp->b_bcount) { 1593 ((struct direct *) 1594 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ; 1595 blkoff += DIRBLKSIZ; 1596 } 1597 } 1598 if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | 1599 DOINGASYNC(tvp)))) != 0) { 1600 (void)bwrite(bp); 1601 goto bad; 1602 } 1603 /* 1604 * Directory set up, now install its entry in the parent directory. 1605 * 1606 * If we are not doing soft dependencies, then we must write out the 1607 * buffer containing the new directory body before entering the new 1608 * name in the parent. If we are doing soft dependencies, then the 1609 * buffer containing the new directory body will be passed to and 1610 * released in the soft dependency code after the code has attached 1611 * an appropriate ordering dependency to the buffer which ensures that 1612 * the buffer is written before the new name is written in the parent. 1613 */ 1614 if (DOINGASYNC(dvp)) 1615 bdwrite(bp); 1616 else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp)))) 1617 goto bad; 1618 ufs_makedirentry(ip, cnp, &newdir); 1619 error = ufs_direnter(dvp, tvp, &newdir, cnp, bp); 1620 1621bad: 1622 if (error == 0) { 1623 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1624 *ap->a_vpp = tvp; 1625 } else { 1626 dp->i_effnlink--; 1627 dp->i_nlink--; 1628 DIP(dp, i_nlink) = dp->i_nlink; 1629 dp->i_flag |= IN_CHANGE; 1630 if (DOINGSOFTDEP(dvp)) 1631 softdep_change_linkcnt(dp); 1632 /* 1633 * No need to do an explicit VOP_TRUNCATE here, vrele will 1634 * do this for us because we set the link count to 0. 1635 */ 1636 ip->i_effnlink = 0; 1637 ip->i_nlink = 0; 1638 DIP(ip, i_nlink) = 0; 1639 ip->i_flag |= IN_CHANGE; 1640 if (DOINGSOFTDEP(tvp)) 1641 softdep_change_linkcnt(ip); 1642 vput(tvp); 1643 } 1644out: 1645 return (error); 1646} 1647 1648/* 1649 * Rmdir system call. 1650 */ 1651static int 1652ufs_rmdir(ap) 1653 struct vop_rmdir_args /* { 1654 struct vnode *a_dvp; 1655 struct vnode *a_vp; 1656 struct componentname *a_cnp; 1657 } */ *ap; 1658{ 1659 struct vnode *vp = ap->a_vp; 1660 struct vnode *dvp = ap->a_dvp; 1661 struct componentname *cnp = ap->a_cnp; 1662 struct inode *ip, *dp; 1663 int error, ioflag; 1664 1665 ip = VTOI(vp); 1666 dp = VTOI(dvp); 1667 1668 /* 1669 * Do not remove a directory that is in the process of being renamed. 1670 * Verify the directory is empty (and valid). Rmdir ".." will not be 1671 * valid since ".." will contain a reference to the current directory 1672 * and thus be non-empty. Do not allow the removal of mounted on 1673 * directories (this can happen when an NFS exported filesystem 1674 * tries to remove a locally mounted on directory). 1675 */ 1676 error = 0; 1677 if (ip->i_flag & IN_RENAME) { 1678 error = EINVAL; 1679 goto out; 1680 } 1681 if (ip->i_effnlink != 2 || 1682 !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1683 error = ENOTEMPTY; 1684 goto out; 1685 } 1686 if ((dp->i_flags & APPEND) 1687 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1688 error = EPERM; 1689 goto out; 1690 } 1691 if (vp->v_mountedhere != 0) { 1692 error = EINVAL; 1693 goto out; 1694 } 1695 /* 1696 * Delete reference to directory before purging 1697 * inode. If we crash in between, the directory 1698 * will be reattached to lost+found, 1699 */ 1700 dp->i_effnlink--; 1701 ip->i_effnlink--; 1702 if (DOINGSOFTDEP(vp)) { 1703 softdep_change_linkcnt(dp); 1704 softdep_change_linkcnt(ip); 1705 } 1706 error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1); 1707 if (error) { 1708 dp->i_effnlink++; 1709 ip->i_effnlink++; 1710 if (DOINGSOFTDEP(vp)) { 1711 softdep_change_linkcnt(dp); 1712 softdep_change_linkcnt(ip); 1713 } 1714 goto out; 1715 } 1716 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1717 cache_purge(dvp); 1718 /* 1719 * Truncate inode. The only stuff left in the directory is "." and 1720 * "..". The "." reference is inconsequential since we are quashing 1721 * it. The soft dependency code will arrange to do these operations 1722 * after the parent directory entry has been deleted on disk, so 1723 * when running with that code we avoid doing them now. 1724 */ 1725 if (!DOINGSOFTDEP(vp)) { 1726 dp->i_nlink--; 1727 DIP(dp, i_nlink) = dp->i_nlink; 1728 dp->i_flag |= IN_CHANGE; 1729 ip->i_nlink--; 1730 DIP(ip, i_nlink) = ip->i_nlink; 1731 ip->i_flag |= IN_CHANGE; 1732 ioflag = IO_NORMAL; 1733 if (DOINGASYNC(vp)) 1734 ioflag |= IO_SYNC; 1735 error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred, 1736 cnp->cn_thread); 1737 } 1738 cache_purge(vp); 1739#ifdef UFS_DIRHASH 1740 /* Kill any active hash; i_effnlink == 0, so it will not come back. */ 1741 if (ip->i_dirhash != NULL) 1742 ufsdirhash_free(ip); 1743#endif 1744out: 1745 VN_KNOTE(vp, NOTE_DELETE); 1746 return (error); 1747} 1748 1749/* 1750 * symlink -- make a symbolic link 1751 */ 1752static int 1753ufs_symlink(ap) 1754 struct vop_symlink_args /* { 1755 struct vnode *a_dvp; 1756 struct vnode **a_vpp; 1757 struct componentname *a_cnp; 1758 struct vattr *a_vap; 1759 char *a_target; 1760 } */ *ap; 1761{ 1762 struct vnode *vp, **vpp = ap->a_vpp; 1763 struct inode *ip; 1764 int len, error; 1765 1766 error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1767 vpp, ap->a_cnp); 1768 if (error) 1769 return (error); 1770 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1771 vp = *vpp; 1772 len = strlen(ap->a_target); 1773 if (len < vp->v_mount->mnt_maxsymlinklen) { 1774 ip = VTOI(vp); 1775 bcopy(ap->a_target, SHORTLINK(ip), len); 1776 ip->i_size = len; 1777 DIP(ip, i_size) = len; 1778 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1779 } else 1780 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1781 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1782 ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0); 1783 if (error) 1784 vput(vp); 1785 return (error); 1786} 1787 1788/* 1789 * Vnode op for reading directories. 1790 * 1791 * The routine below assumes that the on-disk format of a directory 1792 * is the same as that defined by <sys/dirent.h>. If the on-disk 1793 * format changes, then it will be necessary to do a conversion 1794 * from the on-disk format that read returns to the format defined 1795 * by <sys/dirent.h>. 1796 */ 1797int 1798ufs_readdir(ap) 1799 struct vop_readdir_args /* { 1800 struct vnode *a_vp; 1801 struct uio *a_uio; 1802 struct ucred *a_cred; 1803 int *a_eofflag; 1804 int *ncookies; 1805 u_long **a_cookies; 1806 } */ *ap; 1807{ 1808 struct uio *uio = ap->a_uio; 1809 int error; 1810 size_t count, lost; 1811 off_t off; 1812 1813 if (ap->a_ncookies != NULL) 1814 /* 1815 * Ensure that the block is aligned. The caller can use 1816 * the cookies to determine where in the block to start. 1817 */ 1818 uio->uio_offset &= ~(DIRBLKSIZ - 1); 1819 off = uio->uio_offset; 1820 count = uio->uio_resid; 1821 /* Make sure we don't return partial entries. */ 1822 if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1))) 1823 return (EINVAL); 1824 count -= (uio->uio_offset + count) & (DIRBLKSIZ -1); 1825 lost = uio->uio_resid - count; 1826 uio->uio_resid = count; 1827 uio->uio_iov->iov_len = count; 1828# if (BYTE_ORDER == LITTLE_ENDIAN) 1829 if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { 1830 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1831 } else { 1832 struct dirent *dp, *edp; 1833 struct uio auio; 1834 struct iovec aiov; 1835 caddr_t dirbuf; 1836 int readcnt; 1837 u_char tmp; 1838 1839 auio = *uio; 1840 auio.uio_iov = &aiov; 1841 auio.uio_iovcnt = 1; 1842 auio.uio_segflg = UIO_SYSSPACE; 1843 aiov.iov_len = count; 1844 MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); 1845 aiov.iov_base = dirbuf; 1846 error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred); 1847 if (error == 0) { 1848 readcnt = count - auio.uio_resid; 1849 edp = (struct dirent *)&dirbuf[readcnt]; 1850 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 1851 tmp = dp->d_namlen; 1852 dp->d_namlen = dp->d_type; 1853 dp->d_type = tmp; 1854 if (dp->d_reclen > 0) { 1855 dp = (struct dirent *) 1856 ((char *)dp + dp->d_reclen); 1857 } else { 1858 error = EIO; 1859 break; 1860 } 1861 } 1862 if (dp >= edp) 1863 error = uiomove(dirbuf, readcnt, uio); 1864 } 1865 FREE(dirbuf, M_TEMP); 1866 } 1867# else 1868 error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); 1869# endif 1870 if (!error && ap->a_ncookies != NULL) { 1871 struct dirent* dpStart; 1872 struct dirent* dpEnd; 1873 struct dirent* dp; 1874 int ncookies; 1875 u_long *cookies; 1876 u_long *cookiep; 1877 1878 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1879 panic("ufs_readdir: unexpected uio from NFS server"); 1880 dpStart = (struct dirent *) 1881 ((char *)uio->uio_iov->iov_base - (uio->uio_offset - off)); 1882 dpEnd = (struct dirent *) uio->uio_iov->iov_base; 1883 for (dp = dpStart, ncookies = 0; 1884 dp < dpEnd; 1885 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) 1886 ncookies++; 1887 MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP, 1888 M_WAITOK); 1889 for (dp = dpStart, cookiep = cookies; 1890 dp < dpEnd; 1891 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1892 off += dp->d_reclen; 1893 *cookiep++ = (u_long) off; 1894 } 1895 *ap->a_ncookies = ncookies; 1896 *ap->a_cookies = cookies; 1897 } 1898 uio->uio_resid += lost; 1899 if (ap->a_eofflag) 1900 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset; 1901 return (error); 1902} 1903 1904/* 1905 * Return target name of a symbolic link 1906 */ 1907static int 1908ufs_readlink(ap) 1909 struct vop_readlink_args /* { 1910 struct vnode *a_vp; 1911 struct uio *a_uio; 1912 struct ucred *a_cred; 1913 } */ *ap; 1914{ 1915 struct vnode *vp = ap->a_vp; 1916 struct inode *ip = VTOI(vp); 1917 doff_t isize; 1918 1919 isize = ip->i_size; 1920 if ((isize < vp->v_mount->mnt_maxsymlinklen) || 1921 DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */ 1922 uiomove(SHORTLINK(ip), isize, ap->a_uio); 1923 return (0); 1924 } 1925 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1926} 1927 1928/* 1929 * Calculate the logical to physical mapping if not done already, 1930 * then call the device strategy routine. 1931 * 1932 * In order to be able to swap to a file, the ufs_bmaparray() operation may not 1933 * deadlock on memory. See ufs_bmap() for details. 1934 */ 1935static int 1936ufs_strategy(ap) 1937 struct vop_strategy_args /* { 1938 struct vnode *a_vp; 1939 struct buf *a_bp; 1940 } */ *ap; 1941{ 1942 struct buf *bp = ap->a_bp; 1943 struct vnode *vp = ap->a_vp; 1944 struct inode *ip; 1945 ufs2_daddr_t blkno; 1946 int error; 1947 1948 KASSERT(ap->a_vp == ap->a_bp->b_vp, ("%s(%p != %p)", 1949 __func__, ap->a_vp, ap->a_bp->b_vp)); 1950 ip = VTOI(vp); 1951 if (bp->b_blkno == bp->b_lblkno) { 1952 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL); 1953 bp->b_blkno = blkno; 1954 if (error) { 1955 bp->b_error = error; 1956 bp->b_ioflags |= BIO_ERROR; 1957 bufdone(bp); 1958 return (error); 1959 } 1960 if ((long)bp->b_blkno == -1) 1961 vfs_bio_clrbuf(bp); 1962 } 1963 if ((long)bp->b_blkno == -1) { 1964 bufdone(bp); 1965 return (0); 1966 } 1967 vp = ip->i_devvp; 1968 bp->b_dev = vp->v_rdev; 1969 bp->b_iooffset = dbtob(bp->b_blkno); 1970 if (!buf_prewrite(vp, bp)) 1971 VOP_SPECSTRATEGY(vp, bp); 1972 return (0); 1973} 1974 1975/* 1976 * Snapshots require all lock requests to be exclusive. 1977 */ 1978static int 1979ufs_lock(ap) 1980 struct vop_lock_args /* { 1981 struct vnode *a_vp; 1982 int a_flags; 1983 struct thread *a_td; 1984 } */ *ap; 1985{ 1986 struct vnode *vp = ap->a_vp; 1987 int flags = ap->a_flags; 1988 1989 if ((VTOI(vp)->i_flags & SF_SNAPSHOT) && 1990 ((flags & LK_TYPE_MASK) == LK_SHARED)) { 1991 flags &= ~LK_TYPE_MASK; 1992 flags |= LK_EXCLUSIVE; 1993 } 1994#ifndef DEBUG_LOCKS 1995 return (lockmgr(vp->v_vnlock, flags, VI_MTX(vp), ap->a_td)); 1996#else 1997 return (debuglockmgr(vp->v_vnlock, flags, VI_MTX(vp), 1998 ap->a_td, "vop_stdlock", vp->filename, vp->line)); 1999#endif 2000} 2001 2002/* 2003 * Print out the contents of an inode. 2004 */ 2005static int 2006ufs_print(ap) 2007 struct vop_print_args /* { 2008 struct vnode *a_vp; 2009 } */ *ap; 2010{ 2011 struct vnode *vp = ap->a_vp; 2012 struct inode *ip = VTOI(vp); 2013 2014 printf("\tino %lu, on dev %s (%d, %d)", (u_long)ip->i_number, 2015 devtoname(ip->i_dev), major(ip->i_dev), minor(ip->i_dev)); 2016 if (vp->v_type == VFIFO) 2017 fifo_printinfo(vp); 2018 printf("\n"); 2019 return (0); 2020} 2021 2022/* 2023 * Read wrapper for special devices. 2024 */ 2025static int 2026ufsspec_read(ap) 2027 struct vop_read_args /* { 2028 struct vnode *a_vp; 2029 struct uio *a_uio; 2030 int a_ioflag; 2031 struct ucred *a_cred; 2032 } */ *ap; 2033{ 2034 int error, resid; 2035 struct inode *ip; 2036 struct uio *uio; 2037 2038 uio = ap->a_uio; 2039 resid = uio->uio_resid; 2040 error = VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap); 2041 /* 2042 * The inode may have been revoked during the call, so it must not 2043 * be accessed blindly here or in the other wrapper functions. 2044 */ 2045 ip = VTOI(ap->a_vp); 2046 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 2047 ip->i_flag |= IN_ACCESS; 2048 return (error); 2049} 2050 2051/* 2052 * Write wrapper for special devices. 2053 */ 2054static int 2055ufsspec_write(ap) 2056 struct vop_write_args /* { 2057 struct vnode *a_vp; 2058 struct uio *a_uio; 2059 int a_ioflag; 2060 struct ucred *a_cred; 2061 } */ *ap; 2062{ 2063 int error, resid; 2064 struct inode *ip; 2065 struct uio *uio; 2066 2067 uio = ap->a_uio; 2068 resid = uio->uio_resid; 2069 error = VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap); 2070 ip = VTOI(ap->a_vp); 2071 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 2072 VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE; 2073 return (error); 2074} 2075 2076/* 2077 * Close wrapper for special devices. 2078 * 2079 * Update the times on the inode then do device close. 2080 */ 2081static int 2082ufsspec_close(ap) 2083 struct vop_close_args /* { 2084 struct vnode *a_vp; 2085 int a_fflag; 2086 struct ucred *a_cred; 2087 struct thread *a_td; 2088 } */ *ap; 2089{ 2090 struct vnode *vp = ap->a_vp; 2091 2092 VI_LOCK(vp); 2093 if (vp->v_usecount > 1) 2094 ufs_itimes(vp); 2095 VI_UNLOCK(vp); 2096 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 2097} 2098 2099/* 2100 * Read wrapper for fifos. 2101 */ 2102static int 2103ufsfifo_read(ap) 2104 struct vop_read_args /* { 2105 struct vnode *a_vp; 2106 struct uio *a_uio; 2107 int a_ioflag; 2108 struct ucred *a_cred; 2109 } */ *ap; 2110{ 2111 int error, resid; 2112 struct inode *ip; 2113 struct uio *uio; 2114 2115 uio = ap->a_uio; 2116 resid = uio->uio_resid; 2117 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap); 2118 ip = VTOI(ap->a_vp); 2119 if ((ap->a_vp->v_mount->mnt_flag & MNT_NOATIME) == 0 && ip != NULL && 2120 (uio->uio_resid != resid || (error == 0 && resid != 0))) 2121 ip->i_flag |= IN_ACCESS; 2122 return (error); 2123} 2124 2125/* 2126 * Write wrapper for fifos. 2127 */ 2128static int 2129ufsfifo_write(ap) 2130 struct vop_write_args /* { 2131 struct vnode *a_vp; 2132 struct uio *a_uio; 2133 int a_ioflag; 2134 struct ucred *a_cred; 2135 } */ *ap; 2136{ 2137 int error, resid; 2138 struct inode *ip; 2139 struct uio *uio; 2140 2141 uio = ap->a_uio; 2142 resid = uio->uio_resid; 2143 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap); 2144 ip = VTOI(ap->a_vp); 2145 if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0))) 2146 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2147 return (error); 2148} 2149 2150/* 2151 * Close wrapper for fifos. 2152 * 2153 * Update the times on the inode then do device close. 2154 */ 2155static int 2156ufsfifo_close(ap) 2157 struct vop_close_args /* { 2158 struct vnode *a_vp; 2159 int a_fflag; 2160 struct ucred *a_cred; 2161 struct thread *a_td; 2162 } */ *ap; 2163{ 2164 struct vnode *vp = ap->a_vp; 2165 2166 VI_LOCK(vp); 2167 if (vp->v_usecount > 1) 2168 ufs_itimes(vp); 2169 VI_UNLOCK(vp); 2170 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 2171} 2172 2173/* 2174 * Kqfilter wrapper for fifos. 2175 * 2176 * Fall through to ufs kqfilter routines if needed 2177 */ 2178static int 2179ufsfifo_kqfilter(ap) 2180 struct vop_kqfilter_args *ap; 2181{ 2182 int error; 2183 2184 error = VOCALL(fifo_vnodeop_p, VOFFSET(vop_kqfilter), ap); 2185 if (error) 2186 error = ufs_kqfilter(ap); 2187 return (error); 2188} 2189 2190/* 2191 * Return POSIX pathconf information applicable to ufs filesystems. 2192 */ 2193static int 2194ufs_pathconf(ap) 2195 struct vop_pathconf_args /* { 2196 struct vnode *a_vp; 2197 int a_name; 2198 int *a_retval; 2199 } */ *ap; 2200{ 2201 int error; 2202 2203 error = 0; 2204 switch (ap->a_name) { 2205 case _PC_LINK_MAX: 2206 *ap->a_retval = LINK_MAX; 2207 break; 2208 case _PC_NAME_MAX: 2209 *ap->a_retval = NAME_MAX; 2210 break; 2211 case _PC_PATH_MAX: 2212 *ap->a_retval = PATH_MAX; 2213 break; 2214 case _PC_PIPE_BUF: 2215 *ap->a_retval = PIPE_BUF; 2216 break; 2217 case _PC_CHOWN_RESTRICTED: 2218 *ap->a_retval = 1; 2219 break; 2220 case _PC_NO_TRUNC: 2221 *ap->a_retval = 1; 2222 break; 2223 case _PC_ACL_EXTENDED: 2224#ifdef UFS_ACL 2225 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2226 *ap->a_retval = 1; 2227 else 2228 *ap->a_retval = 0; 2229#else 2230 *ap->a_retval = 0; 2231#endif 2232 break; 2233 case _PC_ACL_PATH_MAX: 2234#ifdef UFS_ACL 2235 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 2236 *ap->a_retval = ACL_MAX_ENTRIES; 2237 else 2238 *ap->a_retval = 3; 2239#else 2240 *ap->a_retval = 3; 2241#endif 2242 break; 2243 case _PC_MAC_PRESENT: 2244#ifdef MAC 2245 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL) 2246 *ap->a_retval = 1; 2247 else 2248 *ap->a_retval = 0; 2249#else 2250 *ap->a_retval = 0; 2251#endif 2252 break; 2253 case _PC_ASYNC_IO: 2254 /* _PC_ASYNC_IO should have been handled by upper layers. */ 2255 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 2256 error = EINVAL; 2257 break; 2258 case _PC_PRIO_IO: 2259 *ap->a_retval = 0; 2260 break; 2261 case _PC_SYNC_IO: 2262 *ap->a_retval = 0; 2263 break; 2264 case _PC_ALLOC_SIZE_MIN: 2265 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 2266 break; 2267 case _PC_FILESIZEBITS: 2268 *ap->a_retval = 64; 2269 break; 2270 case _PC_REC_INCR_XFER_SIZE: 2271 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2272 break; 2273 case _PC_REC_MAX_XFER_SIZE: 2274 *ap->a_retval = -1; /* means ``unlimited'' */ 2275 break; 2276 case _PC_REC_MIN_XFER_SIZE: 2277 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 2278 break; 2279 case _PC_REC_XFER_ALIGN: 2280 *ap->a_retval = PAGE_SIZE; 2281 break; 2282 case _PC_SYMLINK_MAX: 2283 *ap->a_retval = MAXPATHLEN; 2284 break; 2285 2286 default: 2287 error = EINVAL; 2288 break; 2289 } 2290 return (error); 2291} 2292 2293/* 2294 * Advisory record locking support 2295 */ 2296static int 2297ufs_advlock(ap) 2298 struct vop_advlock_args /* { 2299 struct vnode *a_vp; 2300 caddr_t a_id; 2301 int a_op; 2302 struct flock *a_fl; 2303 int a_flags; 2304 } */ *ap; 2305{ 2306 struct inode *ip = VTOI(ap->a_vp); 2307 2308 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size)); 2309} 2310 2311/* 2312 * Initialize the vnode associated with a new inode, handle aliased 2313 * vnodes. 2314 */ 2315int 2316ufs_vinit(mntp, specops, fifoops, vpp) 2317 struct mount *mntp; 2318 vop_t **specops; 2319 vop_t **fifoops; 2320 struct vnode **vpp; 2321{ 2322 struct inode *ip; 2323 struct vnode *vp; 2324 struct timeval tv; 2325 2326 vp = *vpp; 2327 ip = VTOI(vp); 2328 switch(vp->v_type = IFTOVT(ip->i_mode)) { 2329 case VCHR: 2330 case VBLK: 2331 vp->v_op = specops; 2332 vp = addaliasu(vp, DIP(ip, i_rdev)); 2333 ip->i_vnode = vp; 2334 break; 2335 case VFIFO: 2336 vp->v_op = fifoops; 2337 break; 2338 default: 2339 break; 2340 2341 } 2342 ASSERT_VOP_LOCKED(vp, "ufs_vinit"); 2343 if (ip->i_number == ROOTINO) 2344 vp->v_vflag |= VV_ROOT; 2345 /* 2346 * Initialize modrev times 2347 */ 2348 getmicrouptime(&tv); 2349 SETHIGH(ip->i_modrev, tv.tv_sec); 2350 SETLOW(ip->i_modrev, tv.tv_usec * 4294); 2351 *vpp = vp; 2352 return (0); 2353} 2354 2355/* 2356 * Allocate a new inode. 2357 * Vnode dvp must be locked. 2358 */ 2359static int 2360ufs_makeinode(mode, dvp, vpp, cnp) 2361 int mode; 2362 struct vnode *dvp; 2363 struct vnode **vpp; 2364 struct componentname *cnp; 2365{ 2366 struct inode *ip, *pdir; 2367 struct direct newdir; 2368 struct vnode *tvp; 2369#ifdef UFS_ACL 2370 struct acl *acl; 2371#endif 2372 int error; 2373 2374 pdir = VTOI(dvp); 2375#ifdef DIAGNOSTIC 2376 if ((cnp->cn_flags & HASBUF) == 0) 2377 panic("ufs_makeinode: no name"); 2378#endif 2379 *vpp = NULL; 2380 if ((mode & IFMT) == 0) 2381 mode |= IFREG; 2382 2383 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp); 2384 if (error) 2385 return (error); 2386 ip = VTOI(tvp); 2387 ip->i_gid = pdir->i_gid; 2388 DIP(ip, i_gid) = pdir->i_gid; 2389#ifdef SUIDDIR 2390 { 2391#ifdef QUOTA 2392 struct ucred ucred, *ucp; 2393 ucp = cnp->cn_cred; 2394#endif 2395 /* 2396 * If we are not the owner of the directory, 2397 * and we are hacking owners here, (only do this where told to) 2398 * and we are not giving it TO root, (would subvert quotas) 2399 * then go ahead and give it to the other user. 2400 * Note that this drops off the execute bits for security. 2401 */ 2402 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 2403 (pdir->i_mode & ISUID) && 2404 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 2405 ip->i_uid = pdir->i_uid; 2406 DIP(ip, i_uid) = ip->i_uid; 2407 mode &= ~07111; 2408#ifdef QUOTA 2409 /* 2410 * Make sure the correct user gets charged 2411 * for the space. 2412 * Quickly knock up a dummy credential for the victim. 2413 * XXX This seems to never be accessed out of our 2414 * context so a stack variable is ok. 2415 */ 2416 ucred.cr_ref = 1; 2417 ucred.cr_uid = ip->i_uid; 2418 ucred.cr_ngroups = 1; 2419 ucred.cr_groups[0] = pdir->i_gid; 2420 ucp = &ucred; 2421#endif 2422 } else { 2423 ip->i_uid = cnp->cn_cred->cr_uid; 2424 DIP(ip, i_uid) = ip->i_uid; 2425 } 2426 2427#ifdef QUOTA 2428 if ((error = getinoquota(ip)) || 2429 (error = chkiq(ip, 1, ucp, 0))) { 2430 UFS_VFREE(tvp, ip->i_number, mode); 2431 vput(tvp); 2432 return (error); 2433 } 2434#endif 2435 } 2436#else /* !SUIDDIR */ 2437 ip->i_uid = cnp->cn_cred->cr_uid; 2438 DIP(ip, i_uid) = ip->i_uid; 2439#ifdef QUOTA 2440 if ((error = getinoquota(ip)) || 2441 (error = chkiq(ip, 1, cnp->cn_cred, 0))) { 2442 UFS_VFREE(tvp, ip->i_number, mode); 2443 vput(tvp); 2444 return (error); 2445 } 2446#endif 2447#endif /* !SUIDDIR */ 2448 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2449#ifdef UFS_ACL 2450 acl = NULL; 2451 if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) { 2452 MALLOC(acl, struct acl *, sizeof(*acl), M_ACL, M_WAITOK); 2453 2454 /* 2455 * Retrieve default ACL for parent, if any. 2456 */ 2457 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred, 2458 cnp->cn_thread); 2459 switch (error) { 2460 case 0: 2461 /* 2462 * Retrieved a default ACL, so merge mode and ACL if 2463 * necessary. 2464 */ 2465 if (acl->acl_cnt != 0) { 2466 /* 2467 * Two possible ways for default ACL to not 2468 * be present. First, the EA can be 2469 * undefined, or second, the default ACL can 2470 * be blank. If it's blank, fall through to 2471 * the it's not defined case. 2472 */ 2473 mode = acl_posix1e_newfilemode(mode, acl); 2474 ip->i_mode = mode; 2475 DIP(ip, i_mode) = mode; 2476 ufs_sync_acl_from_inode(ip, acl); 2477 break; 2478 } 2479 /* FALLTHROUGH */ 2480 2481 case EOPNOTSUPP: 2482 /* 2483 * Just use the mode as-is. 2484 */ 2485 ip->i_mode = mode; 2486 DIP(ip, i_mode) = mode; 2487 FREE(acl, M_ACL); 2488 acl = NULL; 2489 break; 2490 2491 default: 2492 UFS_VFREE(tvp, ip->i_number, mode); 2493 vput(tvp); 2494 FREE(acl, M_ACL); 2495 acl = NULL; 2496 return (error); 2497 } 2498 } else { 2499#endif 2500 ip->i_mode = mode; 2501 DIP(ip, i_mode) = mode; 2502#ifdef UFS_ACL 2503 } 2504#endif 2505 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2506 ip->i_effnlink = 1; 2507 ip->i_nlink = 1; 2508 DIP(ip, i_nlink) = 1; 2509 if (DOINGSOFTDEP(tvp)) 2510 softdep_change_linkcnt(ip); 2511 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && 2512 suser_cred(cnp->cn_cred, SUSER_ALLOWJAIL)) { 2513 ip->i_mode &= ~ISGID; 2514 DIP(ip, i_mode) = ip->i_mode; 2515 } 2516 2517 if (cnp->cn_flags & ISWHITEOUT) { 2518 ip->i_flags |= UF_OPAQUE; 2519 DIP(ip, i_flags) = ip->i_flags; 2520 } 2521 2522 /* 2523 * Make sure inode goes to disk before directory entry. 2524 */ 2525 error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp))); 2526 if (error) 2527 goto bad; 2528#ifdef MAC 2529 if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) { 2530 error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount, 2531 dvp, tvp, cnp); 2532 if (error) 2533 goto bad; 2534 } 2535#endif 2536#ifdef UFS_ACL 2537 if (acl != NULL) { 2538 /* 2539 * XXX: If we abort now, will Soft Updates notify the extattr 2540 * code that the EAs for the file need to be released? 2541 */ 2542 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred, 2543 cnp->cn_thread); 2544 switch (error) { 2545 case 0: 2546 break; 2547 2548 case EOPNOTSUPP: 2549 /* 2550 * XXX: This should not happen, as EOPNOTSUPP above was 2551 * supposed to free acl. 2552 */ 2553 printf("ufs_makeinode: VOP_GETACL() but no " 2554 "VOP_SETACL()\n"); 2555 /* panic("ufs_makeinode: VOP_GETACL() but no " 2556 "VOP_SETACL()"); */ 2557 break; 2558 2559 default: 2560 FREE(acl, M_ACL); 2561 goto bad; 2562 } 2563 FREE(acl, M_ACL); 2564 } 2565#endif /* !UFS_ACL */ 2566 ufs_makedirentry(ip, cnp, &newdir); 2567 error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL); 2568 if (error) 2569 goto bad; 2570 *vpp = tvp; 2571 return (0); 2572 2573bad: 2574 /* 2575 * Write error occurred trying to update the inode 2576 * or the directory so must deallocate the inode. 2577 */ 2578 ip->i_effnlink = 0; 2579 ip->i_nlink = 0; 2580 DIP(ip, i_nlink) = 0; 2581 ip->i_flag |= IN_CHANGE; 2582 if (DOINGSOFTDEP(tvp)) 2583 softdep_change_linkcnt(ip); 2584 vput(tvp); 2585 return (error); 2586} 2587 2588static struct filterops ufsread_filtops = 2589 { 1, NULL, filt_ufsdetach, filt_ufsread }; 2590static struct filterops ufswrite_filtops = 2591 { 1, NULL, filt_ufsdetach, filt_ufswrite }; 2592static struct filterops ufsvnode_filtops = 2593 { 1, NULL, filt_ufsdetach, filt_ufsvnode }; 2594 2595static int 2596ufs_kqfilter(ap) 2597 struct vop_kqfilter_args /* { 2598 struct vnode *a_vp; 2599 struct knote *a_kn; 2600 } */ *ap; 2601{ 2602 struct vnode *vp = ap->a_vp; 2603 struct knote *kn = ap->a_kn; 2604 2605 switch (kn->kn_filter) { 2606 case EVFILT_READ: 2607 kn->kn_fop = &ufsread_filtops; 2608 break; 2609 case EVFILT_WRITE: 2610 kn->kn_fop = &ufswrite_filtops; 2611 break; 2612 case EVFILT_VNODE: 2613 kn->kn_fop = &ufsvnode_filtops; 2614 break; 2615 default: 2616 return (1); 2617 } 2618 2619 kn->kn_hook = (caddr_t)vp; 2620 2621 if (vp->v_pollinfo == NULL) 2622 v_addpollinfo(vp); 2623 mtx_lock(&vp->v_pollinfo->vpi_lock); 2624 SLIST_INSERT_HEAD(&vp->v_pollinfo->vpi_selinfo.si_note, kn, kn_selnext); 2625 mtx_unlock(&vp->v_pollinfo->vpi_lock); 2626 2627 return (0); 2628} 2629 2630static void 2631filt_ufsdetach(struct knote *kn) 2632{ 2633 struct vnode *vp = (struct vnode *)kn->kn_hook; 2634 2635 KASSERT(vp->v_pollinfo != NULL, ("Mising v_pollinfo")); 2636 mtx_lock(&vp->v_pollinfo->vpi_lock); 2637 SLIST_REMOVE(&vp->v_pollinfo->vpi_selinfo.si_note, 2638 kn, knote, kn_selnext); 2639 mtx_unlock(&vp->v_pollinfo->vpi_lock); 2640} 2641 2642/*ARGSUSED*/ 2643static int 2644filt_ufsread(struct knote *kn, long hint) 2645{ 2646 struct vnode *vp = (struct vnode *)kn->kn_hook; 2647 struct inode *ip = VTOI(vp); 2648 2649 /* 2650 * filesystem is gone, so set the EOF flag and schedule 2651 * the knote for deletion. 2652 */ 2653 if (hint == NOTE_REVOKE) { 2654 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2655 return (1); 2656 } 2657 2658 kn->kn_data = ip->i_size - kn->kn_fp->f_offset; 2659 return (kn->kn_data != 0); 2660} 2661 2662/*ARGSUSED*/ 2663static int 2664filt_ufswrite(struct knote *kn, long hint) 2665{ 2666 2667 /* 2668 * filesystem is gone, so set the EOF flag and schedule 2669 * the knote for deletion. 2670 */ 2671 if (hint == NOTE_REVOKE) 2672 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 2673 2674 kn->kn_data = 0; 2675 return (1); 2676} 2677 2678static int 2679filt_ufsvnode(struct knote *kn, long hint) 2680{ 2681 2682 if (kn->kn_sfflags & hint) 2683 kn->kn_fflags |= hint; 2684 if (hint == NOTE_REVOKE) { 2685 kn->kn_flags |= EV_EOF; 2686 return (1); 2687 } 2688 return (kn->kn_fflags != 0); 2689} 2690 2691/* Global vfs data structures for ufs. */ 2692static vop_t **ufs_vnodeop_p; 2693static struct vnodeopv_entry_desc ufs_vnodeop_entries[] = { 2694 { &vop_default_desc, (vop_t *) vop_defaultop }, 2695 { &vop_fsync_desc, (vop_t *) vop_panic }, 2696 { &vop_read_desc, (vop_t *) vop_panic }, 2697 { &vop_reallocblks_desc, (vop_t *) vop_panic }, 2698 { &vop_write_desc, (vop_t *) vop_panic }, 2699 { &vop_access_desc, (vop_t *) ufs_access }, 2700 { &vop_advlock_desc, (vop_t *) ufs_advlock }, 2701 { &vop_lock_desc, (vop_t *) ufs_lock }, 2702 { &vop_bmap_desc, (vop_t *) ufs_bmap }, 2703 { &vop_cachedlookup_desc, (vop_t *) ufs_lookup }, 2704 { &vop_close_desc, (vop_t *) ufs_close }, 2705 { &vop_create_desc, (vop_t *) ufs_create }, 2706 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2707 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2708 { &vop_link_desc, (vop_t *) ufs_link }, 2709 { &vop_lookup_desc, (vop_t *) vfs_cache_lookup }, 2710 { &vop_mkdir_desc, (vop_t *) ufs_mkdir }, 2711 { &vop_mknod_desc, (vop_t *) ufs_mknod }, 2712 { &vop_open_desc, (vop_t *) ufs_open }, 2713 { &vop_pathconf_desc, (vop_t *) ufs_pathconf }, 2714 { &vop_poll_desc, (vop_t *) vop_stdpoll }, 2715 { &vop_kqfilter_desc, (vop_t *) ufs_kqfilter }, 2716 { &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount }, 2717 { &vop_print_desc, (vop_t *) ufs_print }, 2718 { &vop_readdir_desc, (vop_t *) ufs_readdir }, 2719 { &vop_readlink_desc, (vop_t *) ufs_readlink }, 2720 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2721 { &vop_remove_desc, (vop_t *) ufs_remove }, 2722 { &vop_rename_desc, (vop_t *) ufs_rename }, 2723 { &vop_rmdir_desc, (vop_t *) ufs_rmdir }, 2724 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2725#ifdef MAC 2726 { &vop_setlabel_desc, (vop_t *) vop_stdsetlabel_ea }, 2727#endif 2728 { &vop_strategy_desc, (vop_t *) ufs_strategy }, 2729 { &vop_symlink_desc, (vop_t *) ufs_symlink }, 2730 { &vop_whiteout_desc, (vop_t *) ufs_whiteout }, 2731#ifdef UFS_EXTATTR 2732 { &vop_getextattr_desc, (vop_t *) ufs_getextattr }, 2733 { &vop_deleteextattr_desc, (vop_t *) ufs_deleteextattr }, 2734 { &vop_setextattr_desc, (vop_t *) ufs_setextattr }, 2735#endif 2736#ifdef UFS_ACL 2737 { &vop_getacl_desc, (vop_t *) ufs_getacl }, 2738 { &vop_setacl_desc, (vop_t *) ufs_setacl }, 2739 { &vop_aclcheck_desc, (vop_t *) ufs_aclcheck }, 2740#endif 2741 { NULL, NULL } 2742}; 2743static struct vnodeopv_desc ufs_vnodeop_opv_desc = 2744 { &ufs_vnodeop_p, ufs_vnodeop_entries }; 2745 2746static vop_t **ufs_specop_p; 2747static struct vnodeopv_entry_desc ufs_specop_entries[] = { 2748 { &vop_default_desc, (vop_t *) spec_vnoperate }, 2749 { &vop_fsync_desc, (vop_t *) vop_panic }, 2750 { &vop_access_desc, (vop_t *) ufs_access }, 2751 { &vop_close_desc, (vop_t *) ufsspec_close }, 2752 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2753 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2754 { &vop_print_desc, (vop_t *) ufs_print }, 2755 { &vop_read_desc, (vop_t *) ufsspec_read }, 2756 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2757 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2758#ifdef MAC 2759 { &vop_setlabel_desc, (vop_t *) vop_stdsetlabel_ea }, 2760#endif 2761 { &vop_write_desc, (vop_t *) ufsspec_write }, 2762#ifdef UFS_EXTATTR 2763 { &vop_getextattr_desc, (vop_t *) ufs_getextattr }, 2764 { &vop_deleteextattr_desc, (vop_t *) ufs_deleteextattr }, 2765 { &vop_setextattr_desc, (vop_t *) ufs_setextattr }, 2766#endif 2767#ifdef UFS_ACL 2768 { &vop_getacl_desc, (vop_t *) ufs_getacl }, 2769 { &vop_setacl_desc, (vop_t *) ufs_setacl }, 2770 { &vop_aclcheck_desc, (vop_t *) ufs_aclcheck }, 2771#endif 2772 {NULL, NULL} 2773}; 2774static struct vnodeopv_desc ufs_specop_opv_desc = 2775 { &ufs_specop_p, ufs_specop_entries }; 2776 2777static vop_t **ufs_fifoop_p; 2778static struct vnodeopv_entry_desc ufs_fifoop_entries[] = { 2779 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 2780 { &vop_fsync_desc, (vop_t *) vop_panic }, 2781 { &vop_access_desc, (vop_t *) ufs_access }, 2782 { &vop_close_desc, (vop_t *) ufsfifo_close }, 2783 { &vop_getattr_desc, (vop_t *) ufs_getattr }, 2784 { &vop_inactive_desc, (vop_t *) ufs_inactive }, 2785 { &vop_kqfilter_desc, (vop_t *) ufsfifo_kqfilter }, 2786 { &vop_print_desc, (vop_t *) ufs_print }, 2787 { &vop_read_desc, (vop_t *) ufsfifo_read }, 2788 { &vop_reclaim_desc, (vop_t *) ufs_reclaim }, 2789 { &vop_setattr_desc, (vop_t *) ufs_setattr }, 2790#ifdef MAC 2791 { &vop_setlabel_desc, (vop_t *) vop_stdsetlabel_ea }, 2792#endif 2793 { &vop_write_desc, (vop_t *) ufsfifo_write }, 2794#ifdef UFS_EXTATTR 2795 { &vop_getextattr_desc, (vop_t *) ufs_getextattr }, 2796 { &vop_deleteextattr_desc, (vop_t *) ufs_deleteextattr }, 2797 { &vop_setextattr_desc, (vop_t *) ufs_setextattr }, 2798#endif 2799#ifdef UFS_ACL 2800 { &vop_getacl_desc, (vop_t *) ufs_getacl }, 2801 { &vop_setacl_desc, (vop_t *) ufs_setacl }, 2802 { &vop_aclcheck_desc, (vop_t *) ufs_aclcheck }, 2803#endif 2804 { NULL, NULL } 2805}; 2806static struct vnodeopv_desc ufs_fifoop_opv_desc = 2807 { &ufs_fifoop_p, ufs_fifoop_entries }; 2808 2809VNODEOP_SET(ufs_vnodeop_opv_desc); 2810VNODEOP_SET(ufs_specop_opv_desc); 2811VNODEOP_SET(ufs_fifoop_opv_desc); 2812 2813int 2814ufs_vnoperate(ap) 2815 struct vop_generic_args /* { 2816 struct vnodeop_desc *a_desc; 2817 } */ *ap; 2818{ 2819 return (VOCALL(ufs_vnodeop_p, ap->a_desc->vdesc_offset, ap)); 2820} 2821 2822int 2823ufs_vnoperatefifo(ap) 2824 struct vop_generic_args /* { 2825 struct vnodeop_desc *a_desc; 2826 } */ *ap; 2827{ 2828 return (VOCALL(ufs_fifoop_p, ap->a_desc->vdesc_offset, ap)); 2829} 2830 2831int 2832ufs_vnoperatespec(ap) 2833 struct vop_generic_args /* { 2834 struct vnodeop_desc *a_desc; 2835 } */ *ap; 2836{ 2837 return (VOCALL(ufs_specop_p, ap->a_desc->vdesc_offset, ap)); 2838} 2839