1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * SPDX-License-Identifier: BSD-3-Clause 9 * 10 * Copyright (c) 1982, 1986, 1989, 1993 11 * The Regents of the University of California. All rights reserved. 12 * (c) UNIX System Laboratories, Inc. 13 * All or some portions of this file are derived from material licensed 14 * to the University of California by American Telephone and Telegraph 15 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 16 * the permission of UNIX System Laboratories, Inc. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94 43 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 44 * $FreeBSD$ 45 */ 46 47 #include "opt_suiddir.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/fcntl.h> 53 #include <sys/filio.h> 54 #include <sys/stat.h> 55 #include <sys/bio.h> 56 #include <sys/buf.h> 57 #include <sys/endian.h> 58 #include <sys/priv.h> 59 #include <sys/rwlock.h> 60 #include <sys/mount.h> 61 #include <sys/unistd.h> 62 #include <sys/time.h> 63 #include <sys/vnode.h> 64 #include <sys/namei.h> 65 #include <sys/lockf.h> 66 #include <sys/event.h> 67 #include <sys/conf.h> 68 #include <sys/file.h> 69 #include <sys/extattr.h> 70 #include <sys/vmmeter.h> 71 72 #include <vm/vm.h> 73 #include <vm/vm_param.h> 74 #include <vm/vm_extern.h> 75 #include <vm/vm_object.h> 76 #include <vm/vm_page.h> 77 #include <vm/vm_pager.h> 78 #include <vm/vnode_pager.h> 79 80 #include "opt_directio.h" 81 82 #include <ufs/ufs/dir.h> 83 84 #include <fs/ext2fs/fs.h> 85 #include <fs/ext2fs/inode.h> 86 #include <fs/ext2fs/ext2_acl.h> 87 #include <fs/ext2fs/ext2fs.h> 88 #include <fs/ext2fs/ext2_extern.h> 89 #include <fs/ext2fs/ext2_dinode.h> 90 #include <fs/ext2fs/ext2_dir.h> 91 #include <fs/ext2fs/ext2_mount.h> 92 #include <fs/ext2fs/ext2_extattr.h> 93 #include <fs/ext2fs/ext2_extents.h> 94 95 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 96 static void ext2_itimes_locked(struct vnode *); 97 98 static vop_access_t ext2_access; 99 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 100 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 101 struct thread *); 102 static vop_close_t ext2_close; 103 static vop_create_t ext2_create; 104 static vop_fsync_t ext2_fsync; 105 static vop_getattr_t ext2_getattr; 106 static vop_ioctl_t ext2_ioctl; 107 static vop_link_t ext2_link; 108 static vop_mkdir_t ext2_mkdir; 109 static vop_mknod_t ext2_mknod; 110 static vop_open_t ext2_open; 111 static vop_pathconf_t ext2_pathconf; 112 static vop_print_t ext2_print; 113 static vop_read_t ext2_read; 114 static vop_readlink_t ext2_readlink; 115 static vop_remove_t ext2_remove; 116 static vop_rename_t ext2_rename; 117 static vop_rmdir_t ext2_rmdir; 118 static vop_setattr_t ext2_setattr; 119 static vop_strategy_t ext2_strategy; 120 static vop_symlink_t ext2_symlink; 121 static vop_write_t ext2_write; 122 static vop_deleteextattr_t ext2_deleteextattr; 123 static vop_getextattr_t ext2_getextattr; 124 static vop_listextattr_t ext2_listextattr; 125 static vop_setextattr_t ext2_setextattr; 126 static vop_vptofh_t ext2_vptofh; 127 static vop_close_t ext2fifo_close; 128 static vop_kqfilter_t ext2fifo_kqfilter; 129 130 /* Global vfs data structures for ext2. */ 131 struct vop_vector ext2_vnodeops = { 132 .vop_default = &default_vnodeops, 133 .vop_access = ext2_access, 134 .vop_bmap = ext2_bmap, 135 .vop_cachedlookup = ext2_lookup, 136 .vop_close = ext2_close, 137 .vop_create = ext2_create, 138 .vop_fsync = ext2_fsync, 139 .vop_getpages = vnode_pager_local_getpages, 140 .vop_getpages_async = vnode_pager_local_getpages_async, 141 .vop_getattr = ext2_getattr, 142 .vop_inactive = ext2_inactive, 143 .vop_ioctl = ext2_ioctl, 144 .vop_link = ext2_link, 145 .vop_lookup = vfs_cache_lookup, 146 .vop_mkdir = ext2_mkdir, 147 .vop_mknod = ext2_mknod, 148 .vop_open = ext2_open, 149 .vop_pathconf = ext2_pathconf, 150 .vop_poll = vop_stdpoll, 151 .vop_print = ext2_print, 152 .vop_read = ext2_read, 153 .vop_readdir = ext2_readdir, 154 .vop_readlink = ext2_readlink, 155 .vop_reallocblks = ext2_reallocblks, 156 .vop_reclaim = ext2_reclaim, 157 .vop_remove = ext2_remove, 158 .vop_rename = ext2_rename, 159 .vop_rmdir = ext2_rmdir, 160 .vop_setattr = ext2_setattr, 161 .vop_strategy = ext2_strategy, 162 .vop_symlink = ext2_symlink, 163 .vop_write = ext2_write, 164 .vop_deleteextattr = ext2_deleteextattr, 165 .vop_getextattr = ext2_getextattr, 166 .vop_listextattr = ext2_listextattr, 167 .vop_setextattr = ext2_setextattr, 168 #ifdef UFS_ACL 169 .vop_getacl = ext2_getacl, 170 .vop_setacl = ext2_setacl, 171 .vop_aclcheck = ext2_aclcheck, 172 #endif /* UFS_ACL */ 173 .vop_vptofh = ext2_vptofh, 174 }; 175 176 struct vop_vector ext2_fifoops = { 177 .vop_default = &fifo_specops, 178 .vop_access = ext2_access, 179 .vop_close = ext2fifo_close, 180 .vop_fsync = ext2_fsync, 181 .vop_getattr = ext2_getattr, 182 .vop_inactive = ext2_inactive, 183 .vop_kqfilter = ext2fifo_kqfilter, 184 .vop_pathconf = ext2_pathconf, 185 .vop_print = ext2_print, 186 .vop_read = VOP_PANIC, 187 .vop_reclaim = ext2_reclaim, 188 .vop_setattr = ext2_setattr, 189 .vop_write = VOP_PANIC, 190 .vop_vptofh = ext2_vptofh, 191 }; 192 193 /* 194 * A virgin directory (no blushing please). 195 * Note that the type and namlen fields are reversed relative to ext2. 196 * Also, we don't use `struct odirtemplate', since it would just cause 197 * endianness problems. 198 */ 199 static struct dirtemplate mastertemplate = { 200 0, 12, 1, EXT2_FT_DIR, ".", 201 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 202 }; 203 static struct dirtemplate omastertemplate = { 204 0, 12, 1, EXT2_FT_UNKNOWN, ".", 205 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 206 }; 207 208 static void 209 ext2_itimes_locked(struct vnode *vp) 210 { 211 struct inode *ip; 212 struct timespec ts; 213 214 ASSERT_VI_LOCKED(vp, __func__); 215 216 ip = VTOI(vp); 217 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 218 return; 219 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 220 ip->i_flag |= IN_LAZYMOD; 221 else 222 ip->i_flag |= IN_MODIFIED; 223 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 224 vfs_timestamp(&ts); 225 if (ip->i_flag & IN_ACCESS) { 226 ip->i_atime = ts.tv_sec; 227 ip->i_atimensec = ts.tv_nsec; 228 } 229 if (ip->i_flag & IN_UPDATE) { 230 ip->i_mtime = ts.tv_sec; 231 ip->i_mtimensec = ts.tv_nsec; 232 ip->i_modrev++; 233 } 234 if (ip->i_flag & IN_CHANGE) { 235 ip->i_ctime = ts.tv_sec; 236 ip->i_ctimensec = ts.tv_nsec; 237 } 238 } 239 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 240 } 241 242 void 243 ext2_itimes(struct vnode *vp) 244 { 245 246 VI_LOCK(vp); 247 ext2_itimes_locked(vp); 248 VI_UNLOCK(vp); 249 } 250 251 /* 252 * Create a regular file 253 */ 254 static int 255 ext2_create(struct vop_create_args *ap) 256 { 257 int error; 258 259 error = 260 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 261 ap->a_dvp, ap->a_vpp, ap->a_cnp); 262 if (error != 0) 263 return (error); 264 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 265 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 266 return (0); 267 } 268 269 static int 270 ext2_open(struct vop_open_args *ap) 271 { 272 273 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 274 return (EOPNOTSUPP); 275 276 /* 277 * Files marked append-only must be opened for appending. 278 */ 279 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 280 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 281 return (EPERM); 282 283 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 284 285 return (0); 286 } 287 288 /* 289 * Close called. 290 * 291 * Update the times on the inode. 292 */ 293 static int 294 ext2_close(struct vop_close_args *ap) 295 { 296 struct vnode *vp = ap->a_vp; 297 298 VI_LOCK(vp); 299 if (vp->v_usecount > 1) 300 ext2_itimes_locked(vp); 301 VI_UNLOCK(vp); 302 return (0); 303 } 304 305 static int 306 ext2_access(struct vop_access_args *ap) 307 { 308 struct vnode *vp = ap->a_vp; 309 struct inode *ip = VTOI(vp); 310 accmode_t accmode = ap->a_accmode; 311 int error; 312 313 if (vp->v_type == VBLK || vp->v_type == VCHR) 314 return (EOPNOTSUPP); 315 316 /* 317 * Disallow write attempts on read-only file systems; 318 * unless the file is a socket, fifo, or a block or 319 * character device resident on the file system. 320 */ 321 if (accmode & VWRITE) { 322 switch (vp->v_type) { 323 case VDIR: 324 case VLNK: 325 case VREG: 326 if (vp->v_mount->mnt_flag & MNT_RDONLY) 327 return (EROFS); 328 break; 329 default: 330 break; 331 } 332 } 333 334 /* If immutable bit set, nobody gets to write it. */ 335 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 336 return (EPERM); 337 338 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 339 ap->a_accmode, ap->a_cred, NULL); 340 return (error); 341 } 342 343 static int 344 ext2_getattr(struct vop_getattr_args *ap) 345 { 346 struct vnode *vp = ap->a_vp; 347 struct inode *ip = VTOI(vp); 348 struct vattr *vap = ap->a_vap; 349 350 ext2_itimes(vp); 351 /* 352 * Copy from inode table 353 */ 354 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 355 vap->va_fileid = ip->i_number; 356 vap->va_mode = ip->i_mode & ~IFMT; 357 vap->va_nlink = ip->i_nlink; 358 vap->va_uid = ip->i_uid; 359 vap->va_gid = ip->i_gid; 360 vap->va_rdev = ip->i_rdev; 361 vap->va_size = ip->i_size; 362 vap->va_atime.tv_sec = ip->i_atime; 363 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 364 vap->va_mtime.tv_sec = ip->i_mtime; 365 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 366 vap->va_ctime.tv_sec = ip->i_ctime; 367 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 368 if E2DI_HAS_XTIME(ip) { 369 vap->va_birthtime.tv_sec = ip->i_birthtime; 370 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 371 } 372 vap->va_flags = ip->i_flags; 373 vap->va_gen = ip->i_gen; 374 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 375 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 376 vap->va_type = IFTOVT(ip->i_mode); 377 vap->va_filerev = ip->i_modrev; 378 return (0); 379 } 380 381 /* 382 * Set attribute vnode op. called from several syscalls 383 */ 384 static int 385 ext2_setattr(struct vop_setattr_args *ap) 386 { 387 struct vattr *vap = ap->a_vap; 388 struct vnode *vp = ap->a_vp; 389 struct inode *ip = VTOI(vp); 390 struct ucred *cred = ap->a_cred; 391 struct thread *td = curthread; 392 int error; 393 394 /* 395 * Check for unsettable attributes. 396 */ 397 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 398 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 399 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 400 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 401 return (EINVAL); 402 } 403 if (vap->va_flags != VNOVAL) { 404 /* Disallow flags not supported by ext2fs. */ 405 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 406 return (EOPNOTSUPP); 407 408 if (vp->v_mount->mnt_flag & MNT_RDONLY) 409 return (EROFS); 410 /* 411 * Callers may only modify the file flags on objects they 412 * have VADMIN rights for. 413 */ 414 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 415 return (error); 416 /* 417 * Unprivileged processes and privileged processes in 418 * jail() are not permitted to unset system flags, or 419 * modify flags if any system flags are set. 420 * Privileged non-jail processes may not modify system flags 421 * if securelevel > 0 and any existing system flags are set. 422 */ 423 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 424 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 425 error = securelevel_gt(cred, 0); 426 if (error) 427 return (error); 428 } 429 } else { 430 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 431 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 432 return (EPERM); 433 } 434 ip->i_flags = vap->va_flags; 435 ip->i_flag |= IN_CHANGE; 436 if (ip->i_flags & (IMMUTABLE | APPEND)) 437 return (0); 438 } 439 if (ip->i_flags & (IMMUTABLE | APPEND)) 440 return (EPERM); 441 /* 442 * Go through the fields and update iff not VNOVAL. 443 */ 444 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 445 if (vp->v_mount->mnt_flag & MNT_RDONLY) 446 return (EROFS); 447 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 448 td)) != 0) 449 return (error); 450 } 451 if (vap->va_size != VNOVAL) { 452 /* 453 * Disallow write attempts on read-only file systems; 454 * unless the file is a socket, fifo, or a block or 455 * character device resident on the file system. 456 */ 457 switch (vp->v_type) { 458 case VDIR: 459 return (EISDIR); 460 case VLNK: 461 case VREG: 462 if (vp->v_mount->mnt_flag & MNT_RDONLY) 463 return (EROFS); 464 break; 465 default: 466 break; 467 } 468 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 469 return (error); 470 } 471 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 472 if (vp->v_mount->mnt_flag & MNT_RDONLY) 473 return (EROFS); 474 /* 475 * From utimes(2): 476 * If times is NULL, ... The caller must be the owner of 477 * the file, have permission to write the file, or be the 478 * super-user. 479 * If times is non-NULL, ... The caller must be the owner of 480 * the file or be the super-user. 481 */ 482 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 483 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 484 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 485 return (error); 486 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 487 if (vap->va_atime.tv_sec != VNOVAL) { 488 ip->i_flag &= ~IN_ACCESS; 489 ip->i_atime = vap->va_atime.tv_sec; 490 ip->i_atimensec = vap->va_atime.tv_nsec; 491 } 492 if (vap->va_mtime.tv_sec != VNOVAL) { 493 ip->i_flag &= ~IN_UPDATE; 494 ip->i_mtime = vap->va_mtime.tv_sec; 495 ip->i_mtimensec = vap->va_mtime.tv_nsec; 496 } 497 ip->i_birthtime = vap->va_birthtime.tv_sec; 498 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 499 error = ext2_update(vp, 0); 500 if (error) 501 return (error); 502 } 503 error = 0; 504 if (vap->va_mode != (mode_t)VNOVAL) { 505 if (vp->v_mount->mnt_flag & MNT_RDONLY) 506 return (EROFS); 507 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 508 } 509 return (error); 510 } 511 512 /* 513 * Change the mode on a file. 514 * Inode must be locked before calling. 515 */ 516 static int 517 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 518 { 519 struct inode *ip = VTOI(vp); 520 int error; 521 522 /* 523 * To modify the permissions on a file, must possess VADMIN 524 * for that file. 525 */ 526 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 527 return (error); 528 /* 529 * Privileged processes may set the sticky bit on non-directories, 530 * as well as set the setgid bit on a file with a group that the 531 * process is not a member of. 532 */ 533 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 534 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 535 if (error) 536 return (EFTYPE); 537 } 538 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 539 error = priv_check_cred(cred, PRIV_VFS_SETGID); 540 if (error) 541 return (error); 542 } 543 ip->i_mode &= ~ALLPERMS; 544 ip->i_mode |= (mode & ALLPERMS); 545 ip->i_flag |= IN_CHANGE; 546 return (0); 547 } 548 549 /* 550 * Perform chown operation on inode ip; 551 * inode must be locked prior to call. 552 */ 553 static int 554 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 555 struct thread *td) 556 { 557 struct inode *ip = VTOI(vp); 558 uid_t ouid; 559 gid_t ogid; 560 int error = 0; 561 562 if (uid == (uid_t)VNOVAL) 563 uid = ip->i_uid; 564 if (gid == (gid_t)VNOVAL) 565 gid = ip->i_gid; 566 /* 567 * To modify the ownership of a file, must possess VADMIN 568 * for that file. 569 */ 570 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 571 return (error); 572 /* 573 * To change the owner of a file, or change the group of a file 574 * to a group of which we are not a member, the caller must 575 * have privilege. 576 */ 577 if (uid != ip->i_uid || (gid != ip->i_gid && 578 !groupmember(gid, cred))) { 579 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 580 if (error) 581 return (error); 582 } 583 ogid = ip->i_gid; 584 ouid = ip->i_uid; 585 ip->i_gid = gid; 586 ip->i_uid = uid; 587 ip->i_flag |= IN_CHANGE; 588 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 589 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 590 ip->i_mode &= ~(ISUID | ISGID); 591 } 592 return (0); 593 } 594 595 /* 596 * Synch an open file. 597 */ 598 /* ARGSUSED */ 599 static int 600 ext2_fsync(struct vop_fsync_args *ap) 601 { 602 /* 603 * Flush all dirty buffers associated with a vnode. 604 */ 605 606 vop_stdfsync(ap); 607 608 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 609 } 610 611 /* 612 * Mknod vnode call 613 */ 614 /* ARGSUSED */ 615 static int 616 ext2_mknod(struct vop_mknod_args *ap) 617 { 618 struct vattr *vap = ap->a_vap; 619 struct vnode **vpp = ap->a_vpp; 620 struct inode *ip; 621 ino_t ino; 622 int error; 623 624 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 625 ap->a_dvp, vpp, ap->a_cnp); 626 if (error) 627 return (error); 628 ip = VTOI(*vpp); 629 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 630 if (vap->va_rdev != VNOVAL) { 631 /* 632 * Want to be able to use this to make badblock 633 * inodes, so don't truncate the dev number. 634 */ 635 if (!(ip->i_flag & IN_E4EXTENTS)) 636 ip->i_rdev = vap->va_rdev; 637 } 638 /* 639 * Remove inode, then reload it through VFS_VGET so it is 640 * checked to see if it is an alias of an existing entry in 641 * the inode cache. XXX I don't believe this is necessary now. 642 */ 643 (*vpp)->v_type = VNON; 644 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 645 vgone(*vpp); 646 vput(*vpp); 647 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 648 if (error) { 649 *vpp = NULL; 650 return (error); 651 } 652 return (0); 653 } 654 655 static int 656 ext2_remove(struct vop_remove_args *ap) 657 { 658 struct inode *ip; 659 struct vnode *vp = ap->a_vp; 660 struct vnode *dvp = ap->a_dvp; 661 int error; 662 663 ip = VTOI(vp); 664 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 665 (VTOI(dvp)->i_flags & APPEND)) { 666 error = EPERM; 667 goto out; 668 } 669 error = ext2_dirremove(dvp, ap->a_cnp); 670 if (error == 0) { 671 ip->i_nlink--; 672 ip->i_flag |= IN_CHANGE; 673 } 674 out: 675 return (error); 676 } 677 678 /* 679 * link vnode call 680 */ 681 static int 682 ext2_link(struct vop_link_args *ap) 683 { 684 struct vnode *vp = ap->a_vp; 685 struct vnode *tdvp = ap->a_tdvp; 686 struct componentname *cnp = ap->a_cnp; 687 struct inode *ip; 688 int error; 689 690 #ifdef INVARIANTS 691 if ((cnp->cn_flags & HASBUF) == 0) 692 panic("ext2_link: no name"); 693 #endif 694 ip = VTOI(vp); 695 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 696 error = EMLINK; 697 goto out; 698 } 699 if (ip->i_flags & (IMMUTABLE | APPEND)) { 700 error = EPERM; 701 goto out; 702 } 703 ip->i_nlink++; 704 ip->i_flag |= IN_CHANGE; 705 error = ext2_update(vp, !DOINGASYNC(vp)); 706 if (!error) 707 error = ext2_direnter(ip, tdvp, cnp); 708 if (error) { 709 ip->i_nlink--; 710 ip->i_flag |= IN_CHANGE; 711 } 712 out: 713 return (error); 714 } 715 716 static int 717 ext2_inc_nlink(struct inode *ip) 718 { 719 720 ip->i_nlink++; 721 722 if (S_ISDIR(ip->i_mode) && 723 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 724 ip->i_nlink > 1) { 725 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 726 ip->i_nlink = 1; 727 } else if (ip->i_nlink > EXT4_LINK_MAX) { 728 ip->i_nlink--; 729 return (EMLINK); 730 } 731 732 return (0); 733 } 734 735 static void 736 ext2_dec_nlink(struct inode *ip) 737 { 738 739 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 740 ip->i_nlink--; 741 } 742 743 /* 744 * Rename system call. 745 * rename("foo", "bar"); 746 * is essentially 747 * unlink("bar"); 748 * link("foo", "bar"); 749 * unlink("foo"); 750 * but ``atomically''. Can't do full commit without saving state in the 751 * inode on disk which isn't feasible at this time. Best we can do is 752 * always guarantee the target exists. 753 * 754 * Basic algorithm is: 755 * 756 * 1) Bump link count on source while we're linking it to the 757 * target. This also ensure the inode won't be deleted out 758 * from underneath us while we work (it may be truncated by 759 * a concurrent `trunc' or `open' for creation). 760 * 2) Link source to destination. If destination already exists, 761 * delete it first. 762 * 3) Unlink source reference to inode if still around. If a 763 * directory was moved and the parent of the destination 764 * is different from the source, patch the ".." entry in the 765 * directory. 766 */ 767 static int 768 ext2_rename(struct vop_rename_args *ap) 769 { 770 struct vnode *tvp = ap->a_tvp; 771 struct vnode *tdvp = ap->a_tdvp; 772 struct vnode *fvp = ap->a_fvp; 773 struct vnode *fdvp = ap->a_fdvp; 774 struct componentname *tcnp = ap->a_tcnp; 775 struct componentname *fcnp = ap->a_fcnp; 776 struct inode *ip, *xp, *dp; 777 struct dirtemplate *dirbuf; 778 int doingdirectory = 0, oldparent = 0, newparent = 0; 779 int error = 0; 780 u_char namlen; 781 782 #ifdef INVARIANTS 783 if ((tcnp->cn_flags & HASBUF) == 0 || 784 (fcnp->cn_flags & HASBUF) == 0) 785 panic("ext2_rename: no name"); 786 #endif 787 /* 788 * Check for cross-device rename. 789 */ 790 if ((fvp->v_mount != tdvp->v_mount) || 791 (tvp && (fvp->v_mount != tvp->v_mount))) { 792 error = EXDEV; 793 abortit: 794 if (tdvp == tvp) 795 vrele(tdvp); 796 else 797 vput(tdvp); 798 if (tvp) 799 vput(tvp); 800 vrele(fdvp); 801 vrele(fvp); 802 return (error); 803 } 804 805 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 806 (VTOI(tdvp)->i_flags & APPEND))) { 807 error = EPERM; 808 goto abortit; 809 } 810 811 /* 812 * Renaming a file to itself has no effect. The upper layers should 813 * not call us in that case. Temporarily just warn if they do. 814 */ 815 if (fvp == tvp) { 816 printf("ext2_rename: fvp == tvp (can't happen)\n"); 817 error = 0; 818 goto abortit; 819 } 820 821 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 822 goto abortit; 823 dp = VTOI(fdvp); 824 ip = VTOI(fvp); 825 if (ip->i_nlink >= EXT4_LINK_MAX && 826 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 827 VOP_UNLOCK(fvp, 0); 828 error = EMLINK; 829 goto abortit; 830 } 831 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 832 || (dp->i_flags & APPEND)) { 833 VOP_UNLOCK(fvp, 0); 834 error = EPERM; 835 goto abortit; 836 } 837 if ((ip->i_mode & IFMT) == IFDIR) { 838 /* 839 * Avoid ".", "..", and aliases of "." for obvious reasons. 840 */ 841 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 842 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 843 (ip->i_flag & IN_RENAME)) { 844 VOP_UNLOCK(fvp, 0); 845 error = EINVAL; 846 goto abortit; 847 } 848 ip->i_flag |= IN_RENAME; 849 oldparent = dp->i_number; 850 doingdirectory++; 851 } 852 vrele(fdvp); 853 854 /* 855 * When the target exists, both the directory 856 * and target vnodes are returned locked. 857 */ 858 dp = VTOI(tdvp); 859 xp = NULL; 860 if (tvp) 861 xp = VTOI(tvp); 862 863 /* 864 * 1) Bump link count while we're moving stuff 865 * around. If we crash somewhere before 866 * completing our work, the link count 867 * may be wrong, but correctable. 868 */ 869 ext2_inc_nlink(ip); 870 ip->i_flag |= IN_CHANGE; 871 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 872 VOP_UNLOCK(fvp, 0); 873 goto bad; 874 } 875 876 /* 877 * If ".." must be changed (ie the directory gets a new 878 * parent) then the source directory must not be in the 879 * directory hierarchy above the target, as this would 880 * orphan everything below the source directory. Also 881 * the user must have write permission in the source so 882 * as to be able to change "..". We must repeat the call 883 * to namei, as the parent directory is unlocked by the 884 * call to checkpath(). 885 */ 886 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 887 VOP_UNLOCK(fvp, 0); 888 if (oldparent != dp->i_number) 889 newparent = dp->i_number; 890 if (doingdirectory && newparent) { 891 if (error) /* write access check above */ 892 goto bad; 893 if (xp != NULL) 894 vput(tvp); 895 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 896 if (error) 897 goto out; 898 VREF(tdvp); 899 error = relookup(tdvp, &tvp, tcnp); 900 if (error) 901 goto out; 902 vrele(tdvp); 903 dp = VTOI(tdvp); 904 xp = NULL; 905 if (tvp) 906 xp = VTOI(tvp); 907 } 908 /* 909 * 2) If target doesn't exist, link the target 910 * to the source and unlink the source. 911 * Otherwise, rewrite the target directory 912 * entry to reference the source inode and 913 * expunge the original entry's existence. 914 */ 915 if (xp == NULL) { 916 if (dp->i_devvp != ip->i_devvp) 917 panic("ext2_rename: EXDEV"); 918 /* 919 * Account for ".." in new directory. 920 * When source and destination have the same 921 * parent we don't fool with the link count. 922 */ 923 if (doingdirectory && newparent) { 924 error = ext2_inc_nlink(dp); 925 if (error) 926 goto bad; 927 928 dp->i_flag |= IN_CHANGE; 929 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 930 if (error) 931 goto bad; 932 } 933 error = ext2_direnter(ip, tdvp, tcnp); 934 if (error) { 935 if (doingdirectory && newparent) { 936 ext2_dec_nlink(dp); 937 dp->i_flag |= IN_CHANGE; 938 (void)ext2_update(tdvp, 1); 939 } 940 goto bad; 941 } 942 vput(tdvp); 943 } else { 944 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 945 panic("ext2_rename: EXDEV"); 946 /* 947 * Short circuit rename(foo, foo). 948 */ 949 if (xp->i_number == ip->i_number) 950 panic("ext2_rename: same file"); 951 /* 952 * If the parent directory is "sticky", then the user must 953 * own the parent directory, or the destination of the rename, 954 * otherwise the destination may not be changed (except by 955 * root). This implements append-only directories. 956 */ 957 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 958 tcnp->cn_cred->cr_uid != dp->i_uid && 959 xp->i_uid != tcnp->cn_cred->cr_uid) { 960 error = EPERM; 961 goto bad; 962 } 963 /* 964 * Target must be empty if a directory and have no links 965 * to it. Also, ensure source and target are compatible 966 * (both directories, or both not directories). 967 */ 968 if ((xp->i_mode & IFMT) == IFDIR) { 969 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 970 error = ENOTEMPTY; 971 goto bad; 972 } 973 if (!doingdirectory) { 974 error = ENOTDIR; 975 goto bad; 976 } 977 cache_purge(tdvp); 978 } else if (doingdirectory) { 979 error = EISDIR; 980 goto bad; 981 } 982 error = ext2_dirrewrite(dp, ip, tcnp); 983 if (error) 984 goto bad; 985 /* 986 * If the target directory is in the same 987 * directory as the source directory, 988 * decrement the link count on the parent 989 * of the target directory. 990 */ 991 if (doingdirectory && !newparent) { 992 ext2_dec_nlink(dp); 993 dp->i_flag |= IN_CHANGE; 994 } 995 vput(tdvp); 996 /* 997 * Adjust the link count of the target to 998 * reflect the dirrewrite above. If this is 999 * a directory it is empty and there are 1000 * no links to it, so we can squash the inode and 1001 * any space associated with it. We disallowed 1002 * renaming over top of a directory with links to 1003 * it above, as the remaining link would point to 1004 * a directory without "." or ".." entries. 1005 */ 1006 ext2_dec_nlink(xp); 1007 if (doingdirectory) { 1008 if (--xp->i_nlink != 0) 1009 panic("ext2_rename: linked directory"); 1010 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1011 tcnp->cn_cred, tcnp->cn_thread); 1012 } 1013 xp->i_flag |= IN_CHANGE; 1014 vput(tvp); 1015 xp = NULL; 1016 } 1017 1018 /* 1019 * 3) Unlink the source. 1020 */ 1021 fcnp->cn_flags &= ~MODMASK; 1022 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1023 VREF(fdvp); 1024 error = relookup(fdvp, &fvp, fcnp); 1025 if (error == 0) 1026 vrele(fdvp); 1027 if (fvp != NULL) { 1028 xp = VTOI(fvp); 1029 dp = VTOI(fdvp); 1030 } else { 1031 /* 1032 * From name has disappeared. IN_RENAME is not sufficient 1033 * to protect against directory races due to timing windows, 1034 * so we can't panic here. 1035 */ 1036 vrele(ap->a_fvp); 1037 return (0); 1038 } 1039 /* 1040 * Ensure that the directory entry still exists and has not 1041 * changed while the new name has been entered. If the source is 1042 * a file then the entry may have been unlinked or renamed. In 1043 * either case there is no further work to be done. If the source 1044 * is a directory then it cannot have been rmdir'ed; its link 1045 * count of three would cause a rmdir to fail with ENOTEMPTY. 1046 * The IN_RENAME flag ensures that it cannot be moved by another 1047 * rename. 1048 */ 1049 if (xp != ip) { 1050 /* 1051 * From name resolves to a different inode. IN_RENAME is 1052 * not sufficient protection against timing window races 1053 * so we can't panic here. 1054 */ 1055 } else { 1056 /* 1057 * If the source is a directory with a 1058 * new parent, the link count of the old 1059 * parent directory must be decremented 1060 * and ".." set to point to the new parent. 1061 */ 1062 if (doingdirectory && newparent) { 1063 ext2_dec_nlink(dp); 1064 dp->i_flag |= IN_CHANGE; 1065 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1066 if (!dirbuf) { 1067 error = ENOMEM; 1068 goto bad; 1069 } 1070 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1071 ip->i_e2fs->e2fs_bsize, (off_t)0, 1072 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1073 tcnp->cn_cred, NOCRED, NULL, NULL); 1074 if (error == 0) { 1075 /* Like ufs little-endian: */ 1076 namlen = dirbuf->dotdot_type; 1077 if (namlen != 2 || 1078 dirbuf->dotdot_name[0] != '.' || 1079 dirbuf->dotdot_name[1] != '.') { 1080 ext2_dirbad(xp, (doff_t)12, 1081 "rename: mangled dir"); 1082 } else { 1083 dirbuf->dotdot_ino = newparent; 1084 /* 1085 * dirblock 0 could be htree root, 1086 * try both csum update functions. 1087 */ 1088 ext2_dirent_csum_set(ip, 1089 (struct ext2fs_direct_2 *)dirbuf); 1090 ext2_dx_csum_set(ip, 1091 (struct ext2fs_direct_2 *)dirbuf); 1092 (void)vn_rdwr(UIO_WRITE, fvp, 1093 (caddr_t)dirbuf, 1094 ip->i_e2fs->e2fs_bsize, 1095 (off_t)0, UIO_SYSSPACE, 1096 IO_NODELOCKED | IO_SYNC | 1097 IO_NOMACCHECK, tcnp->cn_cred, 1098 NOCRED, NULL, NULL); 1099 cache_purge(fdvp); 1100 } 1101 } 1102 free(dirbuf, M_TEMP); 1103 } 1104 error = ext2_dirremove(fdvp, fcnp); 1105 if (!error) { 1106 ext2_dec_nlink(xp); 1107 xp->i_flag |= IN_CHANGE; 1108 } 1109 xp->i_flag &= ~IN_RENAME; 1110 } 1111 if (dp) 1112 vput(fdvp); 1113 if (xp) 1114 vput(fvp); 1115 vrele(ap->a_fvp); 1116 return (error); 1117 1118 bad: 1119 if (xp) 1120 vput(ITOV(xp)); 1121 vput(ITOV(dp)); 1122 out: 1123 if (doingdirectory) 1124 ip->i_flag &= ~IN_RENAME; 1125 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1126 ext2_dec_nlink(ip); 1127 ip->i_flag |= IN_CHANGE; 1128 ip->i_flag &= ~IN_RENAME; 1129 vput(fvp); 1130 } else 1131 vrele(fvp); 1132 return (error); 1133 } 1134 1135 #ifdef UFS_ACL 1136 static int 1137 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1138 mode_t dmode, struct ucred *cred, struct thread *td) 1139 { 1140 int error; 1141 struct inode *ip = VTOI(tvp); 1142 struct acl *dacl, *acl; 1143 1144 acl = acl_alloc(M_WAITOK); 1145 dacl = acl_alloc(M_WAITOK); 1146 1147 /* 1148 * Retrieve default ACL from parent, if any. 1149 */ 1150 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1151 switch (error) { 1152 case 0: 1153 /* 1154 * Retrieved a default ACL, so merge mode and ACL if 1155 * necessary. If the ACL is empty, fall through to 1156 * the "not defined or available" case. 1157 */ 1158 if (acl->acl_cnt != 0) { 1159 dmode = acl_posix1e_newfilemode(dmode, acl); 1160 ip->i_mode = dmode; 1161 *dacl = *acl; 1162 ext2_sync_acl_from_inode(ip, acl); 1163 break; 1164 } 1165 /* FALLTHROUGH */ 1166 1167 case EOPNOTSUPP: 1168 /* 1169 * Just use the mode as-is. 1170 */ 1171 ip->i_mode = dmode; 1172 error = 0; 1173 goto out; 1174 1175 default: 1176 goto out; 1177 } 1178 1179 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1180 if (error == 0) 1181 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1182 switch (error) { 1183 case 0: 1184 break; 1185 1186 case EOPNOTSUPP: 1187 /* 1188 * XXX: This should not happen, as EOPNOTSUPP above 1189 * was supposed to free acl. 1190 */ 1191 #ifdef DEBUG 1192 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1193 #endif /* DEBUG */ 1194 break; 1195 1196 default: 1197 goto out; 1198 } 1199 1200 out: 1201 acl_free(acl); 1202 acl_free(dacl); 1203 1204 return (error); 1205 } 1206 1207 static int 1208 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1209 mode_t mode, struct ucred *cred, struct thread *td) 1210 { 1211 int error; 1212 struct inode *ip = VTOI(tvp); 1213 struct acl *acl; 1214 1215 acl = acl_alloc(M_WAITOK); 1216 1217 /* 1218 * Retrieve default ACL for parent, if any. 1219 */ 1220 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1221 switch (error) { 1222 case 0: 1223 /* 1224 * Retrieved a default ACL, so merge mode and ACL if 1225 * necessary. 1226 */ 1227 if (acl->acl_cnt != 0) { 1228 /* 1229 * Two possible ways for default ACL to not 1230 * be present. First, the EA can be 1231 * undefined, or second, the default ACL can 1232 * be blank. If it's blank, fall through to 1233 * the it's not defined case. 1234 */ 1235 mode = acl_posix1e_newfilemode(mode, acl); 1236 ip->i_mode = mode; 1237 ext2_sync_acl_from_inode(ip, acl); 1238 break; 1239 } 1240 /* FALLTHROUGH */ 1241 1242 case EOPNOTSUPP: 1243 /* 1244 * Just use the mode as-is. 1245 */ 1246 ip->i_mode = mode; 1247 error = 0; 1248 goto out; 1249 1250 default: 1251 goto out; 1252 } 1253 1254 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1255 switch (error) { 1256 case 0: 1257 break; 1258 1259 case EOPNOTSUPP: 1260 /* 1261 * XXX: This should not happen, as EOPNOTSUPP above was 1262 * supposed to free acl. 1263 */ 1264 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1265 "but no VOP_SETACL()\n"); 1266 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1267 "but no VOP_SETACL()"); */ 1268 break; 1269 1270 default: 1271 goto out; 1272 } 1273 1274 out: 1275 acl_free(acl); 1276 1277 return (error); 1278 } 1279 1280 #endif /* UFS_ACL */ 1281 1282 /* 1283 * Mkdir system call 1284 */ 1285 static int 1286 ext2_mkdir(struct vop_mkdir_args *ap) 1287 { 1288 struct m_ext2fs *fs; 1289 struct vnode *dvp = ap->a_dvp; 1290 struct vattr *vap = ap->a_vap; 1291 struct componentname *cnp = ap->a_cnp; 1292 struct inode *ip, *dp; 1293 struct vnode *tvp; 1294 struct dirtemplate dirtemplate, *dtp; 1295 char *buf = NULL; 1296 int error, dmode; 1297 1298 #ifdef INVARIANTS 1299 if ((cnp->cn_flags & HASBUF) == 0) 1300 panic("ext2_mkdir: no name"); 1301 #endif 1302 dp = VTOI(dvp); 1303 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1304 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1305 error = EMLINK; 1306 goto out; 1307 } 1308 dmode = vap->va_mode & 0777; 1309 dmode |= IFDIR; 1310 /* 1311 * Must simulate part of ext2_makeinode here to acquire the inode, 1312 * but not have it entered in the parent directory. The entry is 1313 * made later after writing "." and ".." entries. 1314 */ 1315 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1316 if (error) 1317 goto out; 1318 ip = VTOI(tvp); 1319 fs = ip->i_e2fs; 1320 ip->i_gid = dp->i_gid; 1321 #ifdef SUIDDIR 1322 { 1323 /* 1324 * if we are hacking owners here, (only do this where told to) 1325 * and we are not giving it TOO root, (would subvert quotas) 1326 * then go ahead and give it to the other user. 1327 * The new directory also inherits the SUID bit. 1328 * If user's UID and dir UID are the same, 1329 * 'give it away' so that the SUID is still forced on. 1330 */ 1331 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1332 (dp->i_mode & ISUID) && dp->i_uid) { 1333 dmode |= ISUID; 1334 ip->i_uid = dp->i_uid; 1335 } else { 1336 ip->i_uid = cnp->cn_cred->cr_uid; 1337 } 1338 } 1339 #else 1340 ip->i_uid = cnp->cn_cred->cr_uid; 1341 #endif 1342 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1343 ip->i_mode = dmode; 1344 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1345 ip->i_nlink = 2; 1346 if (cnp->cn_flags & ISWHITEOUT) 1347 ip->i_flags |= UF_OPAQUE; 1348 error = ext2_update(tvp, 1); 1349 1350 /* 1351 * Bump link count in parent directory 1352 * to reflect work done below. Should 1353 * be done before reference is created 1354 * so reparation is possible if we crash. 1355 */ 1356 ext2_inc_nlink(dp); 1357 dp->i_flag |= IN_CHANGE; 1358 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1359 if (error) 1360 goto bad; 1361 1362 /* Initialize directory with "." and ".." from static template. */ 1363 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1364 EXT2F_INCOMPAT_FTYPE)) 1365 dtp = &mastertemplate; 1366 else 1367 dtp = &omastertemplate; 1368 dirtemplate = *dtp; 1369 dirtemplate.dot_ino = ip->i_number; 1370 dirtemplate.dotdot_ino = dp->i_number; 1371 /* 1372 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1373 * just redefine it - for this function only 1374 */ 1375 #undef DIRBLKSIZ 1376 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1377 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1378 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1379 if (!buf) { 1380 error = ENOMEM; 1381 ext2_dec_nlink(dp); 1382 dp->i_flag |= IN_CHANGE; 1383 goto bad; 1384 } 1385 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1386 dirtemplate.dotdot_reclen -= sizeof(struct ext2fs_direct_tail); 1387 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1388 } 1389 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1390 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1391 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1392 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1393 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1394 NULL, NULL); 1395 if (error) { 1396 ext2_dec_nlink(dp); 1397 dp->i_flag |= IN_CHANGE; 1398 goto bad; 1399 } 1400 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1401 /* XXX should grow with balloc() */ 1402 panic("ext2_mkdir: blksize"); 1403 else { 1404 ip->i_size = DIRBLKSIZ; 1405 ip->i_flag |= IN_CHANGE; 1406 } 1407 1408 #ifdef UFS_ACL 1409 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1410 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1411 cnp->cn_cred, cnp->cn_thread); 1412 if (error) 1413 goto bad; 1414 } 1415 1416 #endif /* UFS_ACL */ 1417 1418 /* Directory set up, now install its entry in the parent directory. */ 1419 error = ext2_direnter(ip, dvp, cnp); 1420 if (error) { 1421 ext2_dec_nlink(dp); 1422 dp->i_flag |= IN_CHANGE; 1423 } 1424 bad: 1425 /* 1426 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1427 * for us because we set the link count to 0. 1428 */ 1429 if (error) { 1430 ip->i_nlink = 0; 1431 ip->i_flag |= IN_CHANGE; 1432 vput(tvp); 1433 } else 1434 *ap->a_vpp = tvp; 1435 out: 1436 free(buf, M_TEMP); 1437 return (error); 1438 #undef DIRBLKSIZ 1439 #define DIRBLKSIZ DEV_BSIZE 1440 } 1441 1442 /* 1443 * Rmdir system call. 1444 */ 1445 static int 1446 ext2_rmdir(struct vop_rmdir_args *ap) 1447 { 1448 struct vnode *vp = ap->a_vp; 1449 struct vnode *dvp = ap->a_dvp; 1450 struct componentname *cnp = ap->a_cnp; 1451 struct inode *ip, *dp; 1452 int error; 1453 1454 ip = VTOI(vp); 1455 dp = VTOI(dvp); 1456 1457 /* 1458 * Verify the directory is empty (and valid). 1459 * (Rmdir ".." won't be valid since 1460 * ".." will contain a reference to 1461 * the current directory and thus be 1462 * non-empty.) 1463 */ 1464 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1465 error = ENOTEMPTY; 1466 goto out; 1467 } 1468 if ((dp->i_flags & APPEND) 1469 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1470 error = EPERM; 1471 goto out; 1472 } 1473 /* 1474 * Delete reference to directory before purging 1475 * inode. If we crash in between, the directory 1476 * will be reattached to lost+found, 1477 */ 1478 error = ext2_dirremove(dvp, cnp); 1479 if (error) 1480 goto out; 1481 ext2_dec_nlink(dp); 1482 dp->i_flag |= IN_CHANGE; 1483 cache_purge(dvp); 1484 VOP_UNLOCK(dvp, 0); 1485 /* 1486 * Truncate inode. The only stuff left 1487 * in the directory is "." and "..". 1488 */ 1489 ip->i_nlink = 0; 1490 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1491 cnp->cn_thread); 1492 cache_purge(ITOV(ip)); 1493 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1494 VOP_UNLOCK(vp, 0); 1495 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1496 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1497 } 1498 out: 1499 return (error); 1500 } 1501 1502 /* 1503 * symlink -- make a symbolic link 1504 */ 1505 static int 1506 ext2_symlink(struct vop_symlink_args *ap) 1507 { 1508 struct vnode *vp, **vpp = ap->a_vpp; 1509 struct inode *ip; 1510 int len, error; 1511 1512 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1513 vpp, ap->a_cnp); 1514 if (error) 1515 return (error); 1516 vp = *vpp; 1517 len = strlen(ap->a_target); 1518 if (len < vp->v_mount->mnt_maxsymlinklen) { 1519 ip = VTOI(vp); 1520 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1521 ip->i_size = len; 1522 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1523 } else 1524 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1525 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1526 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1527 if (error) 1528 vput(vp); 1529 return (error); 1530 } 1531 1532 /* 1533 * Return target name of a symbolic link 1534 */ 1535 static int 1536 ext2_readlink(struct vop_readlink_args *ap) 1537 { 1538 struct vnode *vp = ap->a_vp; 1539 struct inode *ip = VTOI(vp); 1540 int isize; 1541 1542 isize = ip->i_size; 1543 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1544 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1545 return (0); 1546 } 1547 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1548 } 1549 1550 /* 1551 * Calculate the logical to physical mapping if not done already, 1552 * then call the device strategy routine. 1553 * 1554 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1555 * deadlock on memory. See ext2_bmap() for details. 1556 */ 1557 static int 1558 ext2_strategy(struct vop_strategy_args *ap) 1559 { 1560 struct buf *bp = ap->a_bp; 1561 struct vnode *vp = ap->a_vp; 1562 struct bufobj *bo; 1563 daddr_t blkno; 1564 int error; 1565 1566 if (vp->v_type == VBLK || vp->v_type == VCHR) 1567 panic("ext2_strategy: spec"); 1568 if (bp->b_blkno == bp->b_lblkno) { 1569 1570 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1571 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1572 else 1573 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1574 1575 bp->b_blkno = blkno; 1576 if (error) { 1577 bp->b_error = error; 1578 bp->b_ioflags |= BIO_ERROR; 1579 bufdone(bp); 1580 return (0); 1581 } 1582 if ((long)bp->b_blkno == -1) 1583 vfs_bio_clrbuf(bp); 1584 } 1585 if ((long)bp->b_blkno == -1) { 1586 bufdone(bp); 1587 return (0); 1588 } 1589 bp->b_iooffset = dbtob(bp->b_blkno); 1590 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1591 BO_STRATEGY(bo, bp); 1592 return (0); 1593 } 1594 1595 /* 1596 * Print out the contents of an inode. 1597 */ 1598 static int 1599 ext2_print(struct vop_print_args *ap) 1600 { 1601 struct vnode *vp = ap->a_vp; 1602 struct inode *ip = VTOI(vp); 1603 1604 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1605 if (vp->v_type == VFIFO) 1606 fifo_printinfo(vp); 1607 printf("\n"); 1608 return (0); 1609 } 1610 1611 /* 1612 * Close wrapper for fifos. 1613 * 1614 * Update the times on the inode then do device close. 1615 */ 1616 static int 1617 ext2fifo_close(struct vop_close_args *ap) 1618 { 1619 struct vnode *vp = ap->a_vp; 1620 1621 VI_LOCK(vp); 1622 if (vp->v_usecount > 1) 1623 ext2_itimes_locked(vp); 1624 VI_UNLOCK(vp); 1625 return (fifo_specops.vop_close(ap)); 1626 } 1627 1628 /* 1629 * Kqfilter wrapper for fifos. 1630 * 1631 * Fall through to ext2 kqfilter routines if needed 1632 */ 1633 static int 1634 ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1635 { 1636 int error; 1637 1638 error = fifo_specops.vop_kqfilter(ap); 1639 if (error) 1640 error = vfs_kqfilter(ap); 1641 return (error); 1642 } 1643 1644 /* 1645 * Return POSIX pathconf information applicable to ext2 filesystems. 1646 */ 1647 static int 1648 ext2_pathconf(struct vop_pathconf_args *ap) 1649 { 1650 int error = 0; 1651 1652 switch (ap->a_name) { 1653 case _PC_LINK_MAX: 1654 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1655 EXT2F_ROCOMPAT_DIR_NLINK)) 1656 *ap->a_retval = INT_MAX; 1657 else 1658 *ap->a_retval = EXT4_LINK_MAX; 1659 break; 1660 case _PC_NAME_MAX: 1661 *ap->a_retval = NAME_MAX; 1662 break; 1663 case _PC_PIPE_BUF: 1664 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1665 *ap->a_retval = PIPE_BUF; 1666 else 1667 error = EINVAL; 1668 break; 1669 case _PC_CHOWN_RESTRICTED: 1670 *ap->a_retval = 1; 1671 break; 1672 case _PC_NO_TRUNC: 1673 *ap->a_retval = 1; 1674 break; 1675 1676 #ifdef UFS_ACL 1677 case _PC_ACL_EXTENDED: 1678 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1679 *ap->a_retval = 1; 1680 else 1681 *ap->a_retval = 0; 1682 break; 1683 case _PC_ACL_PATH_MAX: 1684 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1685 *ap->a_retval = ACL_MAX_ENTRIES; 1686 else 1687 *ap->a_retval = 3; 1688 break; 1689 #endif /* UFS_ACL */ 1690 1691 case _PC_MIN_HOLE_SIZE: 1692 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1693 break; 1694 case _PC_PRIO_IO: 1695 *ap->a_retval = 0; 1696 break; 1697 case _PC_SYNC_IO: 1698 *ap->a_retval = 0; 1699 break; 1700 case _PC_ALLOC_SIZE_MIN: 1701 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1702 break; 1703 case _PC_FILESIZEBITS: 1704 *ap->a_retval = 64; 1705 break; 1706 case _PC_REC_INCR_XFER_SIZE: 1707 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1708 break; 1709 case _PC_REC_MAX_XFER_SIZE: 1710 *ap->a_retval = -1; /* means ``unlimited'' */ 1711 break; 1712 case _PC_REC_MIN_XFER_SIZE: 1713 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1714 break; 1715 case _PC_REC_XFER_ALIGN: 1716 *ap->a_retval = PAGE_SIZE; 1717 break; 1718 case _PC_SYMLINK_MAX: 1719 *ap->a_retval = MAXPATHLEN; 1720 break; 1721 1722 default: 1723 error = vop_stdpathconf(ap); 1724 break; 1725 } 1726 return (error); 1727 } 1728 1729 /* 1730 * Vnode operation to remove a named attribute. 1731 */ 1732 static int 1733 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1734 { 1735 struct inode *ip; 1736 struct m_ext2fs *fs; 1737 int error; 1738 1739 ip = VTOI(ap->a_vp); 1740 fs = ip->i_e2fs; 1741 1742 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1743 return (EOPNOTSUPP); 1744 1745 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1746 return (EOPNOTSUPP); 1747 1748 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1749 ap->a_cred, ap->a_td, VWRITE); 1750 if (error) 1751 return (error); 1752 1753 error = ENOATTR; 1754 1755 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1756 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1757 if (error != ENOATTR) 1758 return (error); 1759 } 1760 1761 if (ip->i_facl) 1762 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1763 1764 return (error); 1765 } 1766 1767 /* 1768 * Vnode operation to retrieve a named extended attribute. 1769 */ 1770 static int 1771 ext2_getextattr(struct vop_getextattr_args *ap) 1772 { 1773 struct inode *ip; 1774 struct m_ext2fs *fs; 1775 int error; 1776 1777 ip = VTOI(ap->a_vp); 1778 fs = ip->i_e2fs; 1779 1780 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1781 return (EOPNOTSUPP); 1782 1783 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1784 return (EOPNOTSUPP); 1785 1786 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1787 ap->a_cred, ap->a_td, VREAD); 1788 if (error) 1789 return (error); 1790 1791 if (ap->a_size != NULL) 1792 *ap->a_size = 0; 1793 1794 error = ENOATTR; 1795 1796 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1797 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1798 ap->a_name, ap->a_uio, ap->a_size); 1799 if (error != ENOATTR) 1800 return (error); 1801 } 1802 1803 if (ip->i_facl) 1804 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1805 ap->a_name, ap->a_uio, ap->a_size); 1806 1807 return (error); 1808 } 1809 1810 /* 1811 * Vnode operation to retrieve extended attributes on a vnode. 1812 */ 1813 static int 1814 ext2_listextattr(struct vop_listextattr_args *ap) 1815 { 1816 struct inode *ip; 1817 struct m_ext2fs *fs; 1818 int error; 1819 1820 ip = VTOI(ap->a_vp); 1821 fs = ip->i_e2fs; 1822 1823 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1824 return (EOPNOTSUPP); 1825 1826 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1827 return (EOPNOTSUPP); 1828 1829 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1830 ap->a_cred, ap->a_td, VREAD); 1831 if (error) 1832 return (error); 1833 1834 if (ap->a_size != NULL) 1835 *ap->a_size = 0; 1836 1837 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1838 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1839 ap->a_uio, ap->a_size); 1840 if (error) 1841 return (error); 1842 } 1843 1844 if (ip->i_facl) 1845 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1846 ap->a_uio, ap->a_size); 1847 1848 return (error); 1849 } 1850 1851 /* 1852 * Vnode operation to set a named attribute. 1853 */ 1854 static int 1855 ext2_setextattr(struct vop_setextattr_args *ap) 1856 { 1857 struct inode *ip; 1858 struct m_ext2fs *fs; 1859 int error; 1860 1861 ip = VTOI(ap->a_vp); 1862 fs = ip->i_e2fs; 1863 1864 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1865 return (EOPNOTSUPP); 1866 1867 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1868 return (EOPNOTSUPP); 1869 1870 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1871 ap->a_cred, ap->a_td, VWRITE); 1872 if (error) 1873 return (error); 1874 1875 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1876 if (error) 1877 return (error); 1878 1879 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1880 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1881 ap->a_name, ap->a_uio); 1882 if (error != ENOSPC) 1883 return (error); 1884 } 1885 1886 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1887 ap->a_name, ap->a_uio); 1888 1889 return (error); 1890 } 1891 1892 /* 1893 * Vnode pointer to File handle 1894 */ 1895 /* ARGSUSED */ 1896 static int 1897 ext2_vptofh(struct vop_vptofh_args *ap) 1898 { 1899 struct inode *ip; 1900 struct ufid *ufhp; 1901 1902 ip = VTOI(ap->a_vp); 1903 ufhp = (struct ufid *)ap->a_fhp; 1904 ufhp->ufid_len = sizeof(struct ufid); 1905 ufhp->ufid_ino = ip->i_number; 1906 ufhp->ufid_gen = ip->i_gen; 1907 return (0); 1908 } 1909 1910 /* 1911 * Initialize the vnode associated with a new inode, handle aliased 1912 * vnodes. 1913 */ 1914 int 1915 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1916 { 1917 struct inode *ip; 1918 struct vnode *vp; 1919 1920 vp = *vpp; 1921 ip = VTOI(vp); 1922 vp->v_type = IFTOVT(ip->i_mode); 1923 /* 1924 * Only unallocated inodes should be of type VNON. 1925 */ 1926 if (ip->i_mode != 0 && vp->v_type == VNON) 1927 return (EINVAL); 1928 if (vp->v_type == VFIFO) 1929 vp->v_op = fifoops; 1930 1931 if (ip->i_number == EXT2_ROOTINO) 1932 vp->v_vflag |= VV_ROOT; 1933 ip->i_modrev = init_va_filerev(); 1934 *vpp = vp; 1935 return (0); 1936 } 1937 1938 /* 1939 * Allocate a new inode. 1940 */ 1941 static int 1942 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1943 struct componentname *cnp) 1944 { 1945 struct inode *ip, *pdir; 1946 struct vnode *tvp; 1947 int error; 1948 1949 pdir = VTOI(dvp); 1950 #ifdef INVARIANTS 1951 if ((cnp->cn_flags & HASBUF) == 0) 1952 panic("ext2_makeinode: no name"); 1953 #endif 1954 *vpp = NULL; 1955 if ((mode & IFMT) == 0) 1956 mode |= IFREG; 1957 1958 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1959 if (error) { 1960 return (error); 1961 } 1962 ip = VTOI(tvp); 1963 ip->i_gid = pdir->i_gid; 1964 #ifdef SUIDDIR 1965 { 1966 /* 1967 * if we are 1968 * not the owner of the directory, 1969 * and we are hacking owners here, (only do this where told to) 1970 * and we are not giving it TOO root, (would subvert quotas) 1971 * then go ahead and give it to the other user. 1972 * Note that this drops off the execute bits for security. 1973 */ 1974 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1975 (pdir->i_mode & ISUID) && 1976 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1977 ip->i_uid = pdir->i_uid; 1978 mode &= ~07111; 1979 } else { 1980 ip->i_uid = cnp->cn_cred->cr_uid; 1981 } 1982 } 1983 #else 1984 ip->i_uid = cnp->cn_cred->cr_uid; 1985 #endif 1986 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1987 ip->i_mode = mode; 1988 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1989 ip->i_nlink = 1; 1990 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1991 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 1992 ip->i_mode &= ~ISGID; 1993 } 1994 1995 if (cnp->cn_flags & ISWHITEOUT) 1996 ip->i_flags |= UF_OPAQUE; 1997 1998 /* 1999 * Make sure inode goes to disk before directory entry. 2000 */ 2001 error = ext2_update(tvp, !DOINGASYNC(tvp)); 2002 if (error) 2003 goto bad; 2004 2005 #ifdef UFS_ACL 2006 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 2007 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 2008 cnp->cn_cred, cnp->cn_thread); 2009 if (error) 2010 goto bad; 2011 } 2012 #endif /* UFS_ACL */ 2013 2014 error = ext2_direnter(ip, dvp, cnp); 2015 if (error) 2016 goto bad; 2017 2018 *vpp = tvp; 2019 return (0); 2020 2021 bad: 2022 /* 2023 * Write error occurred trying to update the inode 2024 * or the directory so must deallocate the inode. 2025 */ 2026 ip->i_nlink = 0; 2027 ip->i_flag |= IN_CHANGE; 2028 vput(tvp); 2029 return (error); 2030 } 2031 2032 /* 2033 * Vnode op for reading. 2034 */ 2035 static int 2036 ext2_read(struct vop_read_args *ap) 2037 { 2038 struct vnode *vp; 2039 struct inode *ip; 2040 struct uio *uio; 2041 struct m_ext2fs *fs; 2042 struct buf *bp; 2043 daddr_t lbn, nextlbn; 2044 off_t bytesinfile; 2045 long size, xfersize, blkoffset; 2046 int error, orig_resid, seqcount; 2047 int ioflag; 2048 2049 vp = ap->a_vp; 2050 uio = ap->a_uio; 2051 ioflag = ap->a_ioflag; 2052 2053 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2054 ip = VTOI(vp); 2055 2056 #ifdef INVARIANTS 2057 if (uio->uio_rw != UIO_READ) 2058 panic("%s: mode", "ext2_read"); 2059 2060 if (vp->v_type == VLNK) { 2061 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 2062 panic("%s: short symlink", "ext2_read"); 2063 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2064 panic("%s: type %d", "ext2_read", vp->v_type); 2065 #endif 2066 orig_resid = uio->uio_resid; 2067 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2068 if (orig_resid == 0) 2069 return (0); 2070 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2071 fs = ip->i_e2fs; 2072 if (uio->uio_offset < ip->i_size && 2073 uio->uio_offset >= fs->e2fs_maxfilesize) 2074 return (EOVERFLOW); 2075 2076 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2077 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2078 break; 2079 lbn = lblkno(fs, uio->uio_offset); 2080 nextlbn = lbn + 1; 2081 size = blksize(fs, ip, lbn); 2082 blkoffset = blkoff(fs, uio->uio_offset); 2083 2084 xfersize = fs->e2fs_fsize - blkoffset; 2085 if (uio->uio_resid < xfersize) 2086 xfersize = uio->uio_resid; 2087 if (bytesinfile < xfersize) 2088 xfersize = bytesinfile; 2089 2090 if (lblktosize(fs, nextlbn) >= ip->i_size) 2091 error = bread(vp, lbn, size, NOCRED, &bp); 2092 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2093 error = cluster_read(vp, ip->i_size, lbn, size, 2094 NOCRED, blkoffset + uio->uio_resid, seqcount, 2095 0, &bp); 2096 } else if (seqcount > 1) { 2097 u_int nextsize = blksize(fs, ip, nextlbn); 2098 2099 error = breadn(vp, lbn, 2100 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2101 } else 2102 error = bread(vp, lbn, size, NOCRED, &bp); 2103 if (error) { 2104 brelse(bp); 2105 bp = NULL; 2106 break; 2107 } 2108 2109 /* 2110 * We should only get non-zero b_resid when an I/O error 2111 * has occurred, which should cause us to break above. 2112 * However, if the short read did not cause an error, 2113 * then we want to ensure that we do not uiomove bad 2114 * or uninitialized data. 2115 */ 2116 size -= bp->b_resid; 2117 if (size < xfersize) { 2118 if (size == 0) 2119 break; 2120 xfersize = size; 2121 } 2122 error = uiomove((char *)bp->b_data + blkoffset, 2123 (int)xfersize, uio); 2124 if (error) 2125 break; 2126 vfs_bio_brelse(bp, ioflag); 2127 } 2128 2129 /* 2130 * This can only happen in the case of an error because the loop 2131 * above resets bp to NULL on each iteration and on normal 2132 * completion has not set a new value into it. so it must have come 2133 * from a 'break' statement 2134 */ 2135 if (bp != NULL) 2136 vfs_bio_brelse(bp, ioflag); 2137 2138 if ((error == 0 || uio->uio_resid != orig_resid) && 2139 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2140 ip->i_flag |= IN_ACCESS; 2141 return (error); 2142 } 2143 2144 static int 2145 ext2_ioctl(struct vop_ioctl_args *ap) 2146 { 2147 2148 switch (ap->a_command) { 2149 case FIOSEEKDATA: 2150 case FIOSEEKHOLE: 2151 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 2152 (off_t *)ap->a_data, ap->a_cred)); 2153 default: 2154 return (ENOTTY); 2155 } 2156 } 2157 2158 /* 2159 * Vnode op for writing. 2160 */ 2161 static int 2162 ext2_write(struct vop_write_args *ap) 2163 { 2164 struct vnode *vp; 2165 struct uio *uio; 2166 struct inode *ip; 2167 struct m_ext2fs *fs; 2168 struct buf *bp; 2169 daddr_t lbn; 2170 off_t osize; 2171 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2172 2173 ioflag = ap->a_ioflag; 2174 uio = ap->a_uio; 2175 vp = ap->a_vp; 2176 2177 seqcount = ioflag >> IO_SEQSHIFT; 2178 ip = VTOI(vp); 2179 2180 #ifdef INVARIANTS 2181 if (uio->uio_rw != UIO_WRITE) 2182 panic("%s: mode", "ext2_write"); 2183 #endif 2184 2185 switch (vp->v_type) { 2186 case VREG: 2187 if (ioflag & IO_APPEND) 2188 uio->uio_offset = ip->i_size; 2189 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2190 return (EPERM); 2191 /* FALLTHROUGH */ 2192 case VLNK: 2193 break; 2194 case VDIR: 2195 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2196 if ((ioflag & IO_SYNC) == 0) 2197 panic("ext2_write: nonsync dir write"); 2198 break; 2199 default: 2200 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2201 vp->v_type, (intmax_t)uio->uio_offset, 2202 (intmax_t)uio->uio_resid); 2203 } 2204 2205 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2206 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2207 fs = ip->i_e2fs; 2208 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2209 return (EFBIG); 2210 /* 2211 * Maybe this should be above the vnode op call, but so long as 2212 * file servers have no limits, I don't think it matters. 2213 */ 2214 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 2215 return (EFBIG); 2216 2217 resid = uio->uio_resid; 2218 osize = ip->i_size; 2219 if (seqcount > BA_SEQMAX) 2220 flags = BA_SEQMAX << BA_SEQSHIFT; 2221 else 2222 flags = seqcount << BA_SEQSHIFT; 2223 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2224 flags |= IO_SYNC; 2225 2226 for (error = 0; uio->uio_resid > 0;) { 2227 lbn = lblkno(fs, uio->uio_offset); 2228 blkoffset = blkoff(fs, uio->uio_offset); 2229 xfersize = fs->e2fs_fsize - blkoffset; 2230 if (uio->uio_resid < xfersize) 2231 xfersize = uio->uio_resid; 2232 if (uio->uio_offset + xfersize > ip->i_size) 2233 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2234 2235 /* 2236 * We must perform a read-before-write if the transfer size 2237 * does not cover the entire buffer. 2238 */ 2239 if (fs->e2fs_bsize > xfersize) 2240 flags |= BA_CLRBUF; 2241 else 2242 flags &= ~BA_CLRBUF; 2243 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2244 ap->a_cred, &bp, flags); 2245 if (error != 0) 2246 break; 2247 2248 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2249 bp->b_flags |= B_NOCACHE; 2250 if (uio->uio_offset + xfersize > ip->i_size) 2251 ip->i_size = uio->uio_offset + xfersize; 2252 size = blksize(fs, ip, lbn) - bp->b_resid; 2253 if (size < xfersize) 2254 xfersize = size; 2255 2256 error = 2257 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2258 /* 2259 * If the buffer is not already filled and we encounter an 2260 * error while trying to fill it, we have to clear out any 2261 * garbage data from the pages instantiated for the buffer. 2262 * If we do not, a failed uiomove() during a write can leave 2263 * the prior contents of the pages exposed to a userland mmap. 2264 * 2265 * Note that we need only clear buffers with a transfer size 2266 * equal to the block size because buffers with a shorter 2267 * transfer size were cleared above by the call to ext2_balloc() 2268 * with the BA_CLRBUF flag set. 2269 * 2270 * If the source region for uiomove identically mmaps the 2271 * buffer, uiomove() performed the NOP copy, and the buffer 2272 * content remains valid because the page fault handler 2273 * validated the pages. 2274 */ 2275 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2276 fs->e2fs_bsize == xfersize) 2277 vfs_bio_clrbuf(bp); 2278 2279 vfs_bio_set_flags(bp, ioflag); 2280 2281 /* 2282 * If IO_SYNC each buffer is written synchronously. Otherwise 2283 * if we have a severe page deficiency write the buffer 2284 * asynchronously. Otherwise try to cluster, and if that 2285 * doesn't do it then either do an async write (if O_DIRECT), 2286 * or a delayed write (if not). 2287 */ 2288 if (ioflag & IO_SYNC) { 2289 (void)bwrite(bp); 2290 } else if (vm_page_count_severe() || 2291 buf_dirty_count_severe() || 2292 (ioflag & IO_ASYNC)) { 2293 bp->b_flags |= B_CLUSTEROK; 2294 bawrite(bp); 2295 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2296 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2297 bp->b_flags |= B_CLUSTEROK; 2298 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2299 } else { 2300 bawrite(bp); 2301 } 2302 } else if (ioflag & IO_DIRECT) { 2303 bp->b_flags |= B_CLUSTEROK; 2304 bawrite(bp); 2305 } else { 2306 bp->b_flags |= B_CLUSTEROK; 2307 bdwrite(bp); 2308 } 2309 if (error || xfersize == 0) 2310 break; 2311 } 2312 /* 2313 * If we successfully wrote any data, and we are not the superuser 2314 * we clear the setuid and setgid bits as a precaution against 2315 * tampering. 2316 */ 2317 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2318 ap->a_cred) { 2319 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2320 ip->i_mode &= ~(ISUID | ISGID); 2321 } 2322 if (error) { 2323 if (ioflag & IO_UNIT) { 2324 (void)ext2_truncate(vp, osize, 2325 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2326 uio->uio_offset -= resid - uio->uio_resid; 2327 uio->uio_resid = resid; 2328 } 2329 } 2330 if (uio->uio_resid != resid) { 2331 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2332 if (ioflag & IO_SYNC) 2333 error = ext2_update(vp, 1); 2334 } 2335 return (error); 2336 } 2337