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/limits.h> 55 #include <sys/sdt.h> 56 #include <sys/stat.h> 57 #include <sys/bio.h> 58 #include <sys/buf.h> 59 #include <sys/endian.h> 60 #include <sys/priv.h> 61 #include <sys/rwlock.h> 62 #include <sys/mount.h> 63 #include <sys/unistd.h> 64 #include <sys/time.h> 65 #include <sys/vnode.h> 66 #include <sys/namei.h> 67 #include <sys/lockf.h> 68 #include <sys/event.h> 69 #include <sys/conf.h> 70 #include <sys/file.h> 71 #include <sys/extattr.h> 72 #include <sys/vmmeter.h> 73 74 #include <vm/vm.h> 75 #include <vm/vm_param.h> 76 #include <vm/vm_extern.h> 77 #include <vm/vm_object.h> 78 #include <vm/vm_page.h> 79 #include <vm/vm_pager.h> 80 #include <vm/vnode_pager.h> 81 82 #include "opt_directio.h" 83 84 #include <ufs/ufs/dir.h> 85 86 #include <fs/ext2fs/fs.h> 87 #include <fs/ext2fs/inode.h> 88 #include <fs/ext2fs/ext2_acl.h> 89 #include <fs/ext2fs/ext2fs.h> 90 #include <fs/ext2fs/ext2_extern.h> 91 #include <fs/ext2fs/ext2_dinode.h> 92 #include <fs/ext2fs/ext2_dir.h> 93 #include <fs/ext2fs/ext2_mount.h> 94 #include <fs/ext2fs/ext2_extattr.h> 95 #include <fs/ext2fs/ext2_extents.h> 96 97 SDT_PROVIDER_DECLARE(ext2fs); 98 /* 99 * ext2fs trace probe: 100 * arg0: verbosity. Higher numbers give more verbose messages 101 * arg1: Textual message 102 */ 103 SDT_PROBE_DEFINE2(ext2fs, , vnops, trace, "int", "char*"); 104 105 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 106 static void ext2_itimes_locked(struct vnode *); 107 108 static vop_access_t ext2_access; 109 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 110 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 111 struct thread *); 112 static vop_close_t ext2_close; 113 static vop_create_t ext2_create; 114 static vop_fsync_t ext2_fsync; 115 static vop_getattr_t ext2_getattr; 116 static vop_ioctl_t ext2_ioctl; 117 static vop_link_t ext2_link; 118 static vop_mkdir_t ext2_mkdir; 119 static vop_mknod_t ext2_mknod; 120 static vop_open_t ext2_open; 121 static vop_pathconf_t ext2_pathconf; 122 static vop_print_t ext2_print; 123 static vop_read_t ext2_read; 124 static vop_readlink_t ext2_readlink; 125 static vop_remove_t ext2_remove; 126 static vop_rename_t ext2_rename; 127 static vop_rmdir_t ext2_rmdir; 128 static vop_setattr_t ext2_setattr; 129 static vop_strategy_t ext2_strategy; 130 static vop_symlink_t ext2_symlink; 131 static vop_write_t ext2_write; 132 static vop_deleteextattr_t ext2_deleteextattr; 133 static vop_getextattr_t ext2_getextattr; 134 static vop_listextattr_t ext2_listextattr; 135 static vop_setextattr_t ext2_setextattr; 136 static vop_vptofh_t ext2_vptofh; 137 static vop_close_t ext2fifo_close; 138 139 /* Global vfs data structures for ext2. */ 140 struct vop_vector ext2_vnodeops = { 141 .vop_default = &default_vnodeops, 142 .vop_access = ext2_access, 143 .vop_bmap = ext2_bmap, 144 .vop_cachedlookup = ext2_lookup, 145 .vop_close = ext2_close, 146 .vop_create = ext2_create, 147 .vop_fsync = ext2_fsync, 148 .vop_getpages = vnode_pager_local_getpages, 149 .vop_getpages_async = vnode_pager_local_getpages_async, 150 .vop_getattr = ext2_getattr, 151 .vop_inactive = ext2_inactive, 152 .vop_ioctl = ext2_ioctl, 153 .vop_link = ext2_link, 154 .vop_lookup = vfs_cache_lookup, 155 .vop_mkdir = ext2_mkdir, 156 .vop_mknod = ext2_mknod, 157 .vop_open = ext2_open, 158 .vop_pathconf = ext2_pathconf, 159 .vop_poll = vop_stdpoll, 160 .vop_print = ext2_print, 161 .vop_read = ext2_read, 162 .vop_readdir = ext2_readdir, 163 .vop_readlink = ext2_readlink, 164 .vop_reallocblks = ext2_reallocblks, 165 .vop_reclaim = ext2_reclaim, 166 .vop_remove = ext2_remove, 167 .vop_rename = ext2_rename, 168 .vop_rmdir = ext2_rmdir, 169 .vop_setattr = ext2_setattr, 170 .vop_strategy = ext2_strategy, 171 .vop_symlink = ext2_symlink, 172 .vop_write = ext2_write, 173 .vop_deleteextattr = ext2_deleteextattr, 174 .vop_getextattr = ext2_getextattr, 175 .vop_listextattr = ext2_listextattr, 176 .vop_setextattr = ext2_setextattr, 177 #ifdef UFS_ACL 178 .vop_getacl = ext2_getacl, 179 .vop_setacl = ext2_setacl, 180 .vop_aclcheck = ext2_aclcheck, 181 #endif /* UFS_ACL */ 182 .vop_vptofh = ext2_vptofh, 183 }; 184 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops); 185 186 struct vop_vector ext2_fifoops = { 187 .vop_default = &fifo_specops, 188 .vop_access = ext2_access, 189 .vop_close = ext2fifo_close, 190 .vop_fsync = ext2_fsync, 191 .vop_getattr = ext2_getattr, 192 .vop_inactive = ext2_inactive, 193 .vop_pathconf = ext2_pathconf, 194 .vop_print = ext2_print, 195 .vop_read = VOP_PANIC, 196 .vop_reclaim = ext2_reclaim, 197 .vop_setattr = ext2_setattr, 198 .vop_write = VOP_PANIC, 199 .vop_vptofh = ext2_vptofh, 200 }; 201 VFS_VOP_VECTOR_REGISTER(ext2_fifoops); 202 203 /* 204 * A virgin directory (no blushing please). 205 * Note that the type and namlen fields are reversed relative to ext2. 206 * Also, we don't use `struct odirtemplate', since it would just cause 207 * endianness problems. 208 */ 209 static struct dirtemplate mastertemplate = { 210 0, htole16(12), 1, EXT2_FT_DIR, ".", 211 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".." 212 }; 213 static struct dirtemplate omastertemplate = { 214 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".", 215 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".." 216 }; 217 218 static void 219 ext2_itimes_locked(struct vnode *vp) 220 { 221 struct inode *ip; 222 struct timespec ts; 223 224 ASSERT_VI_LOCKED(vp, __func__); 225 226 ip = VTOI(vp); 227 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 228 return; 229 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 230 ip->i_flag |= IN_LAZYMOD; 231 else 232 ip->i_flag |= IN_MODIFIED; 233 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 234 vfs_timestamp(&ts); 235 if (ip->i_flag & IN_ACCESS) { 236 ip->i_atime = ts.tv_sec; 237 ip->i_atimensec = ts.tv_nsec; 238 } 239 if (ip->i_flag & IN_UPDATE) { 240 ip->i_mtime = ts.tv_sec; 241 ip->i_mtimensec = ts.tv_nsec; 242 ip->i_modrev++; 243 } 244 if (ip->i_flag & IN_CHANGE) { 245 ip->i_ctime = ts.tv_sec; 246 ip->i_ctimensec = ts.tv_nsec; 247 } 248 } 249 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 250 } 251 252 void 253 ext2_itimes(struct vnode *vp) 254 { 255 256 VI_LOCK(vp); 257 ext2_itimes_locked(vp); 258 VI_UNLOCK(vp); 259 } 260 261 /* 262 * Create a regular file 263 */ 264 static int 265 ext2_create(struct vop_create_args *ap) 266 { 267 int error; 268 269 error = 270 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 271 ap->a_dvp, ap->a_vpp, ap->a_cnp); 272 if (error != 0) 273 return (error); 274 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 275 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 276 return (0); 277 } 278 279 static int 280 ext2_open(struct vop_open_args *ap) 281 { 282 283 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 284 return (EOPNOTSUPP); 285 286 /* 287 * Files marked append-only must be opened for appending. 288 */ 289 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 290 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 291 return (EPERM); 292 293 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 294 295 return (0); 296 } 297 298 /* 299 * Close called. 300 * 301 * Update the times on the inode. 302 */ 303 static int 304 ext2_close(struct vop_close_args *ap) 305 { 306 struct vnode *vp = ap->a_vp; 307 308 VI_LOCK(vp); 309 if (vp->v_usecount > 1) 310 ext2_itimes_locked(vp); 311 VI_UNLOCK(vp); 312 return (0); 313 } 314 315 static int 316 ext2_access(struct vop_access_args *ap) 317 { 318 struct vnode *vp = ap->a_vp; 319 struct inode *ip = VTOI(vp); 320 accmode_t accmode = ap->a_accmode; 321 int error; 322 323 /* 324 * Disallow write attempts on read-only file systems; 325 * unless the file is a socket, fifo, or a block or 326 * character device resident on the file system. 327 */ 328 if (accmode & VWRITE) { 329 switch (vp->v_type) { 330 case VDIR: 331 case VLNK: 332 case VREG: 333 if (vp->v_mount->mnt_flag & MNT_RDONLY) 334 return (EROFS); 335 break; 336 default: 337 break; 338 } 339 } 340 341 /* If immutable bit set, nobody gets to write it. */ 342 if ((accmode & VWRITE) && (ip->i_flags & SF_IMMUTABLE)) 343 return (EPERM); 344 345 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 346 ap->a_accmode, ap->a_cred); 347 return (error); 348 } 349 350 static int 351 ext2_getattr(struct vop_getattr_args *ap) 352 { 353 struct vnode *vp = ap->a_vp; 354 struct inode *ip = VTOI(vp); 355 struct vattr *vap = ap->a_vap; 356 357 ext2_itimes(vp); 358 /* 359 * Copy from inode table 360 */ 361 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 362 vap->va_fileid = ip->i_number; 363 vap->va_mode = ip->i_mode & ~IFMT; 364 vap->va_nlink = ip->i_nlink; 365 vap->va_uid = ip->i_uid; 366 vap->va_gid = ip->i_gid; 367 vap->va_rdev = ip->i_rdev; 368 vap->va_size = ip->i_size; 369 vap->va_atime.tv_sec = ip->i_atime; 370 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 371 vap->va_mtime.tv_sec = ip->i_mtime; 372 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 373 vap->va_ctime.tv_sec = ip->i_ctime; 374 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 375 if (E2DI_HAS_XTIME(ip)) { 376 vap->va_birthtime.tv_sec = ip->i_birthtime; 377 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 378 } 379 vap->va_flags = ip->i_flags; 380 vap->va_gen = ip->i_gen; 381 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 382 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 383 vap->va_type = IFTOVT(ip->i_mode); 384 vap->va_filerev = ip->i_modrev; 385 return (0); 386 } 387 388 /* 389 * Set attribute vnode op. called from several syscalls 390 */ 391 static int 392 ext2_setattr(struct vop_setattr_args *ap) 393 { 394 struct vattr *vap = ap->a_vap; 395 struct vnode *vp = ap->a_vp; 396 struct inode *ip = VTOI(vp); 397 struct ucred *cred = ap->a_cred; 398 struct thread *td = curthread; 399 int error; 400 401 /* 402 * Check for unsettable attributes. 403 */ 404 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 405 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 406 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 407 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 408 return (EINVAL); 409 } 410 if (vap->va_flags != VNOVAL) { 411 /* Disallow flags not supported by ext2fs. */ 412 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 413 return (EOPNOTSUPP); 414 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return (EROFS); 417 /* 418 * Callers may only modify the file flags on objects they 419 * have VADMIN rights for. 420 */ 421 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 422 return (error); 423 /* 424 * Unprivileged processes and privileged processes in 425 * jail() are not permitted to unset system flags, or 426 * modify flags if any system flags are set. 427 * Privileged non-jail processes may not modify system flags 428 * if securelevel > 0 and any existing system flags are set. 429 */ 430 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 431 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 432 error = securelevel_gt(cred, 0); 433 if (error) 434 return (error); 435 } 436 } else { 437 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 438 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 439 return (EPERM); 440 } 441 ip->i_flags = vap->va_flags; 442 ip->i_flag |= IN_CHANGE; 443 if (ip->i_flags & (IMMUTABLE | APPEND)) 444 return (0); 445 } 446 if (ip->i_flags & (IMMUTABLE | APPEND)) 447 return (EPERM); 448 /* 449 * Go through the fields and update iff not VNOVAL. 450 */ 451 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 452 if (vp->v_mount->mnt_flag & MNT_RDONLY) 453 return (EROFS); 454 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 455 td)) != 0) 456 return (error); 457 } 458 if (vap->va_size != VNOVAL) { 459 /* 460 * Disallow write attempts on read-only file systems; 461 * unless the file is a socket, fifo, or a block or 462 * character device resident on the file system. 463 */ 464 switch (vp->v_type) { 465 case VDIR: 466 return (EISDIR); 467 case VLNK: 468 case VREG: 469 if (vp->v_mount->mnt_flag & MNT_RDONLY) 470 return (EROFS); 471 break; 472 default: 473 break; 474 } 475 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 476 return (error); 477 } 478 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 479 if (vp->v_mount->mnt_flag & MNT_RDONLY) 480 return (EROFS); 481 /* 482 * From utimes(2): 483 * If times is NULL, ... The caller must be the owner of 484 * the file, have permission to write the file, or be the 485 * super-user. 486 * If times is non-NULL, ... The caller must be the owner of 487 * the file or be the super-user. 488 */ 489 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 490 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 491 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 492 return (error); 493 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 494 if (vap->va_atime.tv_sec != VNOVAL) { 495 ip->i_flag &= ~IN_ACCESS; 496 ip->i_atime = vap->va_atime.tv_sec; 497 ip->i_atimensec = vap->va_atime.tv_nsec; 498 } 499 if (vap->va_mtime.tv_sec != VNOVAL) { 500 ip->i_flag &= ~IN_UPDATE; 501 ip->i_mtime = vap->va_mtime.tv_sec; 502 ip->i_mtimensec = vap->va_mtime.tv_nsec; 503 } 504 if (E2DI_HAS_XTIME(ip) && vap->va_birthtime.tv_sec != VNOVAL) { 505 ip->i_birthtime = vap->va_birthtime.tv_sec; 506 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 507 } 508 error = ext2_update(vp, 0); 509 if (error) 510 return (error); 511 } 512 error = 0; 513 if (vap->va_mode != (mode_t)VNOVAL) { 514 if (vp->v_mount->mnt_flag & MNT_RDONLY) 515 return (EROFS); 516 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 517 } 518 return (error); 519 } 520 521 /* 522 * Change the mode on a file. 523 * Inode must be locked before calling. 524 */ 525 static int 526 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 527 { 528 struct inode *ip = VTOI(vp); 529 int error; 530 531 /* 532 * To modify the permissions on a file, must possess VADMIN 533 * for that file. 534 */ 535 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 536 return (error); 537 /* 538 * Privileged processes may set the sticky bit on non-directories, 539 * as well as set the setgid bit on a file with a group that the 540 * process is not a member of. 541 */ 542 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 543 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 544 if (error) 545 return (EFTYPE); 546 } 547 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 548 error = priv_check_cred(cred, PRIV_VFS_SETGID); 549 if (error) 550 return (error); 551 } 552 ip->i_mode &= ~ALLPERMS; 553 ip->i_mode |= (mode & ALLPERMS); 554 ip->i_flag |= IN_CHANGE; 555 return (0); 556 } 557 558 /* 559 * Perform chown operation on inode ip; 560 * inode must be locked prior to call. 561 */ 562 static int 563 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 564 struct thread *td) 565 { 566 struct inode *ip = VTOI(vp); 567 uid_t ouid; 568 gid_t ogid; 569 int error = 0; 570 571 if (uid == (uid_t)VNOVAL) 572 uid = ip->i_uid; 573 if (gid == (gid_t)VNOVAL) 574 gid = ip->i_gid; 575 /* 576 * To modify the ownership of a file, must possess VADMIN 577 * for that file. 578 */ 579 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 580 return (error); 581 /* 582 * To change the owner of a file, or change the group of a file 583 * to a group of which we are not a member, the caller must 584 * have privilege. 585 */ 586 if (uid != ip->i_uid || (gid != ip->i_gid && 587 !groupmember(gid, cred))) { 588 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 589 if (error) 590 return (error); 591 } 592 ogid = ip->i_gid; 593 ouid = ip->i_uid; 594 ip->i_gid = gid; 595 ip->i_uid = uid; 596 ip->i_flag |= IN_CHANGE; 597 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 598 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 599 ip->i_mode &= ~(ISUID | ISGID); 600 } 601 return (0); 602 } 603 604 /* 605 * Synch an open file. 606 */ 607 /* ARGSUSED */ 608 static int 609 ext2_fsync(struct vop_fsync_args *ap) 610 { 611 /* 612 * Flush all dirty buffers associated with a vnode. 613 */ 614 615 vop_stdfsync(ap); 616 617 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 618 } 619 620 static int 621 ext2_check_mknod_limits(dev_t dev) 622 { 623 unsigned maj = major(dev); 624 unsigned min = minor(dev); 625 626 if (maj > EXT2_MAJOR_MAX || min > EXT2_MINOR_MAX) 627 return (EINVAL); 628 629 return (0); 630 } 631 632 /* 633 * Mknod vnode call 634 */ 635 /* ARGSUSED */ 636 static int 637 ext2_mknod(struct vop_mknod_args *ap) 638 { 639 struct vattr *vap = ap->a_vap; 640 struct vnode **vpp = ap->a_vpp; 641 struct inode *ip; 642 ino_t ino; 643 int error; 644 645 if (vap->va_rdev != VNOVAL) { 646 error = ext2_check_mknod_limits(vap->va_rdev); 647 if (error) 648 return (error); 649 } 650 651 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 652 ap->a_dvp, vpp, ap->a_cnp); 653 if (error) 654 return (error); 655 ip = VTOI(*vpp); 656 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 657 if (vap->va_rdev != VNOVAL) 658 ip->i_rdev = vap->va_rdev; 659 660 /* 661 * Remove inode, then reload it through VFS_VGET so it is 662 * checked to see if it is an alias of an existing entry in 663 * the inode cache. XXX I don't believe this is necessary now. 664 */ 665 (*vpp)->v_type = VNON; 666 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 667 vgone(*vpp); 668 vput(*vpp); 669 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 670 if (error) { 671 *vpp = NULL; 672 return (error); 673 } 674 return (0); 675 } 676 677 static int 678 ext2_remove(struct vop_remove_args *ap) 679 { 680 struct inode *ip; 681 struct vnode *vp = ap->a_vp; 682 struct vnode *dvp = ap->a_dvp; 683 int error; 684 685 ip = VTOI(vp); 686 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 687 (VTOI(dvp)->i_flags & APPEND)) { 688 error = EPERM; 689 goto out; 690 } 691 error = ext2_dirremove(dvp, ap->a_cnp); 692 if (error == 0) { 693 ip->i_nlink--; 694 ip->i_flag |= IN_CHANGE; 695 } 696 out: 697 return (error); 698 } 699 700 /* 701 * link vnode call 702 */ 703 static int 704 ext2_link(struct vop_link_args *ap) 705 { 706 struct vnode *vp = ap->a_vp; 707 struct vnode *tdvp = ap->a_tdvp; 708 struct componentname *cnp = ap->a_cnp; 709 struct inode *ip; 710 int error; 711 712 ip = VTOI(vp); 713 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 714 error = EMLINK; 715 goto out; 716 } 717 if (ip->i_flags & (IMMUTABLE | APPEND)) { 718 error = EPERM; 719 goto out; 720 } 721 ip->i_nlink++; 722 ip->i_flag |= IN_CHANGE; 723 error = ext2_update(vp, !DOINGASYNC(vp)); 724 if (!error) 725 error = ext2_direnter(ip, tdvp, cnp); 726 if (error) { 727 ip->i_nlink--; 728 ip->i_flag |= IN_CHANGE; 729 } 730 out: 731 return (error); 732 } 733 734 static int 735 ext2_inc_nlink(struct inode *ip) 736 { 737 738 ip->i_nlink++; 739 740 if (S_ISDIR(ip->i_mode) && 741 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 742 ip->i_nlink > 1) { 743 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 744 ip->i_nlink = 1; 745 } else if (ip->i_nlink > EXT4_LINK_MAX) { 746 ip->i_nlink--; 747 return (EMLINK); 748 } 749 750 return (0); 751 } 752 753 static void 754 ext2_dec_nlink(struct inode *ip) 755 { 756 757 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 758 ip->i_nlink--; 759 } 760 761 /* 762 * Rename system call. 763 * rename("foo", "bar"); 764 * is essentially 765 * unlink("bar"); 766 * link("foo", "bar"); 767 * unlink("foo"); 768 * but ``atomically''. Can't do full commit without saving state in the 769 * inode on disk which isn't feasible at this time. Best we can do is 770 * always guarantee the target exists. 771 * 772 * Basic algorithm is: 773 * 774 * 1) Bump link count on source while we're linking it to the 775 * target. This also ensure the inode won't be deleted out 776 * from underneath us while we work (it may be truncated by 777 * a concurrent `trunc' or `open' for creation). 778 * 2) Link source to destination. If destination already exists, 779 * delete it first. 780 * 3) Unlink source reference to inode if still around. If a 781 * directory was moved and the parent of the destination 782 * is different from the source, patch the ".." entry in the 783 * directory. 784 */ 785 static int 786 ext2_rename(struct vop_rename_args *ap) 787 { 788 struct vnode *tvp = ap->a_tvp; 789 struct vnode *tdvp = ap->a_tdvp; 790 struct vnode *fvp = ap->a_fvp; 791 struct vnode *fdvp = ap->a_fdvp; 792 struct componentname *tcnp = ap->a_tcnp; 793 struct componentname *fcnp = ap->a_fcnp; 794 struct inode *ip, *xp, *dp; 795 struct dirtemplate *dirbuf; 796 int doingdirectory = 0, oldparent = 0, newparent = 0; 797 int error = 0; 798 u_char namlen; 799 800 /* 801 * Check for cross-device rename. 802 */ 803 if ((fvp->v_mount != tdvp->v_mount) || 804 (tvp && (fvp->v_mount != tvp->v_mount))) { 805 error = EXDEV; 806 abortit: 807 if (tdvp == tvp) 808 vrele(tdvp); 809 else 810 vput(tdvp); 811 if (tvp) 812 vput(tvp); 813 vrele(fdvp); 814 vrele(fvp); 815 return (error); 816 } 817 818 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 819 (VTOI(tdvp)->i_flags & APPEND))) { 820 error = EPERM; 821 goto abortit; 822 } 823 824 /* 825 * Renaming a file to itself has no effect. The upper layers should 826 * not call us in that case. Temporarily just warn if they do. 827 */ 828 if (fvp == tvp) { 829 SDT_PROBE2(ext2fs, , vnops, trace, 1, 830 "rename: fvp == tvp (can't happen)"); 831 error = 0; 832 goto abortit; 833 } 834 835 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 836 goto abortit; 837 dp = VTOI(fdvp); 838 ip = VTOI(fvp); 839 if (ip->i_nlink >= EXT4_LINK_MAX && 840 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 841 VOP_UNLOCK(fvp); 842 error = EMLINK; 843 goto abortit; 844 } 845 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 846 || (dp->i_flags & APPEND)) { 847 VOP_UNLOCK(fvp); 848 error = EPERM; 849 goto abortit; 850 } 851 if ((ip->i_mode & IFMT) == IFDIR) { 852 /* 853 * Avoid ".", "..", and aliases of "." for obvious reasons. 854 */ 855 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 856 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 857 (ip->i_flag & IN_RENAME)) { 858 VOP_UNLOCK(fvp); 859 error = EINVAL; 860 goto abortit; 861 } 862 ip->i_flag |= IN_RENAME; 863 oldparent = dp->i_number; 864 doingdirectory++; 865 } 866 vrele(fdvp); 867 868 /* 869 * When the target exists, both the directory 870 * and target vnodes are returned locked. 871 */ 872 dp = VTOI(tdvp); 873 xp = NULL; 874 if (tvp) 875 xp = VTOI(tvp); 876 877 /* 878 * 1) Bump link count while we're moving stuff 879 * around. If we crash somewhere before 880 * completing our work, the link count 881 * may be wrong, but correctable. 882 */ 883 ext2_inc_nlink(ip); 884 ip->i_flag |= IN_CHANGE; 885 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 886 VOP_UNLOCK(fvp); 887 goto bad; 888 } 889 890 /* 891 * If ".." must be changed (ie the directory gets a new 892 * parent) then the source directory must not be in the 893 * directory hierarchy above the target, as this would 894 * orphan everything below the source directory. Also 895 * the user must have write permission in the source so 896 * as to be able to change "..". We must repeat the call 897 * to namei, as the parent directory is unlocked by the 898 * call to checkpath(). 899 */ 900 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread); 901 VOP_UNLOCK(fvp); 902 if (oldparent != dp->i_number) 903 newparent = dp->i_number; 904 if (doingdirectory && newparent) { 905 if (error) /* write access check above */ 906 goto bad; 907 if (xp != NULL) 908 vput(tvp); 909 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 910 if (error) 911 goto out; 912 VREF(tdvp); 913 error = vfs_relookup(tdvp, &tvp, tcnp, true); 914 if (error) 915 goto out; 916 vrele(tdvp); 917 dp = VTOI(tdvp); 918 xp = NULL; 919 if (tvp) 920 xp = VTOI(tvp); 921 } 922 /* 923 * 2) If target doesn't exist, link the target 924 * to the source and unlink the source. 925 * Otherwise, rewrite the target directory 926 * entry to reference the source inode and 927 * expunge the original entry's existence. 928 */ 929 if (xp == NULL) { 930 if (dp->i_devvp != ip->i_devvp) 931 panic("ext2_rename: EXDEV"); 932 /* 933 * Account for ".." in new directory. 934 * When source and destination have the same 935 * parent we don't fool with the link count. 936 */ 937 if (doingdirectory && newparent) { 938 error = ext2_inc_nlink(dp); 939 if (error) 940 goto bad; 941 942 dp->i_flag |= IN_CHANGE; 943 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 944 if (error) 945 goto bad; 946 } 947 error = ext2_direnter(ip, tdvp, tcnp); 948 if (error) { 949 if (doingdirectory && newparent) { 950 ext2_dec_nlink(dp); 951 dp->i_flag |= IN_CHANGE; 952 (void)ext2_update(tdvp, 1); 953 } 954 goto bad; 955 } 956 vput(tdvp); 957 } else { 958 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 959 panic("ext2_rename: EXDEV"); 960 /* 961 * Short circuit rename(foo, foo). 962 */ 963 if (xp->i_number == ip->i_number) 964 panic("ext2_rename: same file"); 965 /* 966 * If the parent directory is "sticky", then the user must 967 * own the parent directory, or the destination of the rename, 968 * otherwise the destination may not be changed (except by 969 * root). This implements append-only directories. 970 */ 971 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 972 tcnp->cn_cred->cr_uid != dp->i_uid && 973 xp->i_uid != tcnp->cn_cred->cr_uid) { 974 error = EPERM; 975 goto bad; 976 } 977 /* 978 * Target must be empty if a directory and have no links 979 * to it. Also, ensure source and target are compatible 980 * (both directories, or both not directories). 981 */ 982 if ((xp->i_mode & IFMT) == IFDIR) { 983 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 984 error = ENOTEMPTY; 985 goto bad; 986 } 987 if (!doingdirectory) { 988 error = ENOTDIR; 989 goto bad; 990 } 991 cache_purge(tdvp); 992 } else if (doingdirectory) { 993 error = EISDIR; 994 goto bad; 995 } 996 error = ext2_dirrewrite(dp, ip, tcnp); 997 if (error) 998 goto bad; 999 /* 1000 * If the target directory is in the same 1001 * directory as the source directory, 1002 * decrement the link count on the parent 1003 * of the target directory. 1004 */ 1005 if (doingdirectory && !newparent) { 1006 ext2_dec_nlink(dp); 1007 dp->i_flag |= IN_CHANGE; 1008 } 1009 vput(tdvp); 1010 /* 1011 * Adjust the link count of the target to 1012 * reflect the dirrewrite above. If this is 1013 * a directory it is empty and there are 1014 * no links to it, so we can squash the inode and 1015 * any space associated with it. We disallowed 1016 * renaming over top of a directory with links to 1017 * it above, as the remaining link would point to 1018 * a directory without "." or ".." entries. 1019 */ 1020 ext2_dec_nlink(xp); 1021 if (doingdirectory) { 1022 if (xp->i_nlink > 2) 1023 panic("ext2_rename: linked directory"); 1024 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1025 tcnp->cn_cred, curthread); 1026 xp->i_nlink = 0; 1027 } 1028 xp->i_flag |= IN_CHANGE; 1029 vput(tvp); 1030 xp = NULL; 1031 } 1032 1033 /* 1034 * 3) Unlink the source. 1035 */ 1036 fcnp->cn_flags &= ~MODMASK; 1037 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1038 VREF(fdvp); 1039 error = vfs_relookup(fdvp, &fvp, fcnp, true); 1040 if (error == 0) 1041 vrele(fdvp); 1042 if (fvp != NULL) { 1043 xp = VTOI(fvp); 1044 dp = VTOI(fdvp); 1045 } else { 1046 /* 1047 * From name has disappeared. IN_RENAME is not sufficient 1048 * to protect against directory races due to timing windows, 1049 * so we can't panic here. 1050 */ 1051 vrele(ap->a_fvp); 1052 return (0); 1053 } 1054 /* 1055 * Ensure that the directory entry still exists and has not 1056 * changed while the new name has been entered. If the source is 1057 * a file then the entry may have been unlinked or renamed. In 1058 * either case there is no further work to be done. If the source 1059 * is a directory then it cannot have been rmdir'ed; its link 1060 * count of three would cause a rmdir to fail with ENOTEMPTY. 1061 * The IN_RENAME flag ensures that it cannot be moved by another 1062 * rename. 1063 */ 1064 if (xp != ip) { 1065 /* 1066 * From name resolves to a different inode. IN_RENAME is 1067 * not sufficient protection against timing window races 1068 * so we can't panic here. 1069 */ 1070 } else { 1071 /* 1072 * If the source is a directory with a 1073 * new parent, the link count of the old 1074 * parent directory must be decremented 1075 * and ".." set to point to the new parent. 1076 */ 1077 if (doingdirectory && newparent) { 1078 ext2_dec_nlink(dp); 1079 dp->i_flag |= IN_CHANGE; 1080 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1081 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1082 ip->i_e2fs->e2fs_bsize, (off_t)0, 1083 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1084 tcnp->cn_cred, NOCRED, NULL, NULL); 1085 if (error == 0) { 1086 /* Like ufs little-endian: */ 1087 namlen = dirbuf->dotdot_type; 1088 if (namlen != 2 || 1089 dirbuf->dotdot_name[0] != '.' || 1090 dirbuf->dotdot_name[1] != '.') { 1091 ext2_dirbad(xp, (doff_t)12, 1092 "rename: mangled dir"); 1093 } else { 1094 dirbuf->dotdot_ino = htole32(newparent); 1095 /* 1096 * dirblock 0 could be htree root, 1097 * try both csum update functions. 1098 */ 1099 ext2_dirent_csum_set(ip, 1100 (struct ext2fs_direct_2 *)dirbuf); 1101 ext2_dx_csum_set(ip, 1102 (struct ext2fs_direct_2 *)dirbuf); 1103 (void)vn_rdwr(UIO_WRITE, fvp, 1104 (caddr_t)dirbuf, 1105 ip->i_e2fs->e2fs_bsize, 1106 (off_t)0, UIO_SYSSPACE, 1107 IO_NODELOCKED | IO_SYNC | 1108 IO_NOMACCHECK, tcnp->cn_cred, 1109 NOCRED, NULL, NULL); 1110 cache_purge(fdvp); 1111 } 1112 } 1113 free(dirbuf, M_TEMP); 1114 } 1115 error = ext2_dirremove(fdvp, fcnp); 1116 if (!error) { 1117 ext2_dec_nlink(xp); 1118 xp->i_flag |= IN_CHANGE; 1119 } 1120 xp->i_flag &= ~IN_RENAME; 1121 } 1122 if (dp) 1123 vput(fdvp); 1124 if (xp) 1125 vput(fvp); 1126 vrele(ap->a_fvp); 1127 return (error); 1128 1129 bad: 1130 if (xp) 1131 vput(ITOV(xp)); 1132 vput(ITOV(dp)); 1133 out: 1134 if (doingdirectory) 1135 ip->i_flag &= ~IN_RENAME; 1136 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1137 ext2_dec_nlink(ip); 1138 ip->i_flag |= IN_CHANGE; 1139 ip->i_flag &= ~IN_RENAME; 1140 vput(fvp); 1141 } else 1142 vrele(fvp); 1143 return (error); 1144 } 1145 1146 #ifdef UFS_ACL 1147 static int 1148 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1149 mode_t dmode, struct ucred *cred, struct thread *td) 1150 { 1151 int error; 1152 struct inode *ip = VTOI(tvp); 1153 struct acl *dacl, *acl; 1154 1155 acl = acl_alloc(M_WAITOK); 1156 dacl = acl_alloc(M_WAITOK); 1157 1158 /* 1159 * Retrieve default ACL from parent, if any. 1160 */ 1161 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1162 switch (error) { 1163 case 0: 1164 /* 1165 * Retrieved a default ACL, so merge mode and ACL if 1166 * necessary. If the ACL is empty, fall through to 1167 * the "not defined or available" case. 1168 */ 1169 if (acl->acl_cnt != 0) { 1170 dmode = acl_posix1e_newfilemode(dmode, acl); 1171 ip->i_mode = dmode; 1172 *dacl = *acl; 1173 ext2_sync_acl_from_inode(ip, acl); 1174 break; 1175 } 1176 /* FALLTHROUGH */ 1177 1178 case EOPNOTSUPP: 1179 /* 1180 * Just use the mode as-is. 1181 */ 1182 ip->i_mode = dmode; 1183 error = 0; 1184 goto out; 1185 1186 default: 1187 goto out; 1188 } 1189 1190 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1191 if (error == 0) 1192 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1193 switch (error) { 1194 case 0: 1195 break; 1196 1197 case EOPNOTSUPP: 1198 /* 1199 * XXX: This should not happen, as EOPNOTSUPP above 1200 * was supposed to free acl. 1201 */ 1202 #ifdef DEBUG 1203 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1204 #endif /* DEBUG */ 1205 break; 1206 1207 default: 1208 goto out; 1209 } 1210 1211 out: 1212 acl_free(acl); 1213 acl_free(dacl); 1214 1215 return (error); 1216 } 1217 1218 static int 1219 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1220 mode_t mode, struct ucred *cred, struct thread *td) 1221 { 1222 int error; 1223 struct inode *ip = VTOI(tvp); 1224 struct acl *acl; 1225 1226 acl = acl_alloc(M_WAITOK); 1227 1228 /* 1229 * Retrieve default ACL for parent, if any. 1230 */ 1231 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1232 switch (error) { 1233 case 0: 1234 /* 1235 * Retrieved a default ACL, so merge mode and ACL if 1236 * necessary. 1237 */ 1238 if (acl->acl_cnt != 0) { 1239 /* 1240 * Two possible ways for default ACL to not 1241 * be present. First, the EA can be 1242 * undefined, or second, the default ACL can 1243 * be blank. If it's blank, fall through to 1244 * the it's not defined case. 1245 */ 1246 mode = acl_posix1e_newfilemode(mode, acl); 1247 ip->i_mode = mode; 1248 ext2_sync_acl_from_inode(ip, acl); 1249 break; 1250 } 1251 /* FALLTHROUGH */ 1252 1253 case EOPNOTSUPP: 1254 /* 1255 * Just use the mode as-is. 1256 */ 1257 ip->i_mode = mode; 1258 error = 0; 1259 goto out; 1260 1261 default: 1262 goto out; 1263 } 1264 1265 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1266 switch (error) { 1267 case 0: 1268 break; 1269 1270 case EOPNOTSUPP: 1271 /* 1272 * XXX: This should not happen, as EOPNOTSUPP above was 1273 * supposed to free acl. 1274 */ 1275 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1276 "but no VOP_SETACL()\n"); 1277 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1278 "but no VOP_SETACL()"); */ 1279 break; 1280 1281 default: 1282 goto out; 1283 } 1284 1285 out: 1286 acl_free(acl); 1287 1288 return (error); 1289 } 1290 1291 #endif /* UFS_ACL */ 1292 1293 /* 1294 * Mkdir system call 1295 */ 1296 static int 1297 ext2_mkdir(struct vop_mkdir_args *ap) 1298 { 1299 struct m_ext2fs *fs; 1300 struct vnode *dvp = ap->a_dvp; 1301 struct vattr *vap = ap->a_vap; 1302 struct componentname *cnp = ap->a_cnp; 1303 struct inode *ip, *dp; 1304 struct vnode *tvp; 1305 struct dirtemplate dirtemplate, *dtp; 1306 char *buf = NULL; 1307 int error, dmode; 1308 1309 dp = VTOI(dvp); 1310 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1311 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1312 error = EMLINK; 1313 goto out; 1314 } 1315 dmode = vap->va_mode & 0777; 1316 dmode |= IFDIR; 1317 /* 1318 * Must simulate part of ext2_makeinode here to acquire the inode, 1319 * but not have it entered in the parent directory. The entry is 1320 * made later after writing "." and ".." entries. 1321 */ 1322 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1323 if (error) 1324 goto out; 1325 ip = VTOI(tvp); 1326 fs = ip->i_e2fs; 1327 ip->i_gid = dp->i_gid; 1328 #ifdef SUIDDIR 1329 { 1330 /* 1331 * if we are hacking owners here, (only do this where told to) 1332 * and we are not giving it TOO root, (would subvert quotas) 1333 * then go ahead and give it to the other user. 1334 * The new directory also inherits the SUID bit. 1335 * If user's UID and dir UID are the same, 1336 * 'give it away' so that the SUID is still forced on. 1337 */ 1338 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1339 (dp->i_mode & ISUID) && dp->i_uid) { 1340 dmode |= ISUID; 1341 ip->i_uid = dp->i_uid; 1342 } else { 1343 ip->i_uid = cnp->cn_cred->cr_uid; 1344 } 1345 } 1346 #else 1347 ip->i_uid = cnp->cn_cred->cr_uid; 1348 #endif 1349 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1350 ip->i_mode = dmode; 1351 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1352 ip->i_nlink = 2; 1353 if (cnp->cn_flags & ISWHITEOUT) 1354 ip->i_flags |= UF_OPAQUE; 1355 error = ext2_update(tvp, 1); 1356 1357 /* 1358 * Bump link count in parent directory 1359 * to reflect work done below. Should 1360 * be done before reference is created 1361 * so reparation is possible if we crash. 1362 */ 1363 ext2_inc_nlink(dp); 1364 dp->i_flag |= IN_CHANGE; 1365 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1366 if (error) 1367 goto bad; 1368 1369 /* Initialize directory with "." and ".." from static template. */ 1370 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1371 EXT2F_INCOMPAT_FTYPE)) 1372 dtp = &mastertemplate; 1373 else 1374 dtp = &omastertemplate; 1375 dirtemplate = *dtp; 1376 dirtemplate.dot_ino = htole32(ip->i_number); 1377 dirtemplate.dotdot_ino = htole32(dp->i_number); 1378 /* 1379 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1380 * just redefine it - for this function only 1381 */ 1382 #undef DIRBLKSIZ 1383 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1384 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12); 1385 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1386 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1387 dirtemplate.dotdot_reclen = 1388 htole16(le16toh(dirtemplate.dotdot_reclen) - 1389 sizeof(struct ext2fs_direct_tail)); 1390 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1391 } 1392 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1393 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1394 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1395 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1396 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1397 NULL, NULL); 1398 if (error) { 1399 ext2_dec_nlink(dp); 1400 dp->i_flag |= IN_CHANGE; 1401 goto bad; 1402 } 1403 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1404 /* XXX should grow with balloc() */ 1405 panic("ext2_mkdir: blksize"); 1406 else { 1407 ip->i_size = DIRBLKSIZ; 1408 ip->i_flag |= IN_CHANGE; 1409 } 1410 1411 #ifdef UFS_ACL 1412 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1413 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1414 cnp->cn_cred, curthread); 1415 if (error) 1416 goto bad; 1417 } 1418 1419 #endif /* UFS_ACL */ 1420 1421 /* Directory set up, now install its entry in the parent directory. */ 1422 error = ext2_direnter(ip, dvp, cnp); 1423 if (error) { 1424 ext2_dec_nlink(dp); 1425 dp->i_flag |= IN_CHANGE; 1426 } 1427 bad: 1428 /* 1429 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1430 * for us because we set the link count to 0. 1431 */ 1432 if (error) { 1433 ip->i_nlink = 0; 1434 ip->i_flag |= IN_CHANGE; 1435 vput(tvp); 1436 } else 1437 *ap->a_vpp = tvp; 1438 out: 1439 free(buf, M_TEMP); 1440 return (error); 1441 #undef DIRBLKSIZ 1442 #define DIRBLKSIZ DEV_BSIZE 1443 } 1444 1445 /* 1446 * Rmdir system call. 1447 */ 1448 static int 1449 ext2_rmdir(struct vop_rmdir_args *ap) 1450 { 1451 struct vnode *vp = ap->a_vp; 1452 struct vnode *dvp = ap->a_dvp; 1453 struct componentname *cnp = ap->a_cnp; 1454 struct inode *ip, *dp; 1455 int error; 1456 1457 ip = VTOI(vp); 1458 dp = VTOI(dvp); 1459 1460 /* 1461 * Verify the directory is empty (and valid). 1462 * (Rmdir ".." won't be valid since 1463 * ".." will contain a reference to 1464 * the current directory and thus be 1465 * non-empty.) 1466 */ 1467 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1468 error = ENOTEMPTY; 1469 goto out; 1470 } 1471 if ((dp->i_flags & APPEND) 1472 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1473 error = EPERM; 1474 goto out; 1475 } 1476 /* 1477 * Delete reference to directory before purging 1478 * inode. If we crash in between, the directory 1479 * will be reattached to lost+found, 1480 */ 1481 error = ext2_dirremove(dvp, cnp); 1482 if (error) 1483 goto out; 1484 ext2_dec_nlink(dp); 1485 dp->i_flag |= IN_CHANGE; 1486 cache_purge(dvp); 1487 VOP_UNLOCK(dvp); 1488 /* 1489 * Truncate inode. The only stuff left 1490 * in the directory is "." and "..". 1491 */ 1492 ip->i_nlink = 0; 1493 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1494 curthread); 1495 cache_purge(ITOV(ip)); 1496 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1497 VOP_UNLOCK(vp); 1498 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1499 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1500 } 1501 out: 1502 return (error); 1503 } 1504 1505 /* 1506 * symlink -- make a symbolic link 1507 */ 1508 static int 1509 ext2_symlink(struct vop_symlink_args *ap) 1510 { 1511 struct vnode *vp, **vpp = ap->a_vpp; 1512 struct inode *ip; 1513 int len, error; 1514 1515 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1516 vpp, ap->a_cnp); 1517 if (error) 1518 return (error); 1519 vp = *vpp; 1520 len = strlen(ap->a_target); 1521 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1522 ip = VTOI(vp); 1523 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1524 ip->i_size = len; 1525 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1526 } else 1527 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1528 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1529 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1530 if (error) 1531 vput(vp); 1532 return (error); 1533 } 1534 1535 /* 1536 * Return target name of a symbolic link 1537 */ 1538 static int 1539 ext2_readlink(struct vop_readlink_args *ap) 1540 { 1541 struct vnode *vp = ap->a_vp; 1542 struct inode *ip = VTOI(vp); 1543 int isize; 1544 1545 isize = ip->i_size; 1546 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1547 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1548 return (0); 1549 } 1550 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1551 } 1552 1553 /* 1554 * Calculate the logical to physical mapping if not done already, 1555 * then call the device strategy routine. 1556 * 1557 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1558 * deadlock on memory. See ext2_bmap() for details. 1559 */ 1560 static int 1561 ext2_strategy(struct vop_strategy_args *ap) 1562 { 1563 struct buf *bp = ap->a_bp; 1564 struct vnode *vp = ap->a_vp; 1565 struct bufobj *bo; 1566 daddr_t blkno; 1567 int error; 1568 1569 if (vp->v_type == VBLK || vp->v_type == VCHR) 1570 panic("ext2_strategy: spec"); 1571 if (bp->b_blkno == bp->b_lblkno) { 1572 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1573 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1574 else 1575 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1576 1577 bp->b_blkno = blkno; 1578 if (error) { 1579 bp->b_error = error; 1580 bp->b_ioflags |= BIO_ERROR; 1581 bufdone(bp); 1582 return (0); 1583 } 1584 if ((long)bp->b_blkno == -1) 1585 vfs_bio_clrbuf(bp); 1586 } 1587 if ((long)bp->b_blkno == -1) { 1588 bufdone(bp); 1589 return (0); 1590 } 1591 bp->b_iooffset = dbtob(bp->b_blkno); 1592 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1593 BO_STRATEGY(bo, bp); 1594 return (0); 1595 } 1596 1597 /* 1598 * Print out the contents of an inode. 1599 */ 1600 static int 1601 ext2_print(struct vop_print_args *ap) 1602 { 1603 struct vnode *vp = ap->a_vp; 1604 struct inode *ip = VTOI(vp); 1605 1606 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1607 if (vp->v_type == VFIFO) 1608 fifo_printinfo(vp); 1609 printf("\n"); 1610 return (0); 1611 } 1612 1613 /* 1614 * Close wrapper for fifos. 1615 * 1616 * Update the times on the inode then do device close. 1617 */ 1618 static int 1619 ext2fifo_close(struct vop_close_args *ap) 1620 { 1621 struct vnode *vp = ap->a_vp; 1622 1623 VI_LOCK(vp); 1624 if (vp->v_usecount > 1) 1625 ext2_itimes_locked(vp); 1626 VI_UNLOCK(vp); 1627 return (fifo_specops.vop_close(ap)); 1628 } 1629 1630 /* 1631 * Return POSIX pathconf information applicable to ext2 filesystems. 1632 */ 1633 static int 1634 ext2_pathconf(struct vop_pathconf_args *ap) 1635 { 1636 int error = 0; 1637 1638 switch (ap->a_name) { 1639 case _PC_LINK_MAX: 1640 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1641 EXT2F_ROCOMPAT_DIR_NLINK)) 1642 *ap->a_retval = INT_MAX; 1643 else 1644 *ap->a_retval = EXT4_LINK_MAX; 1645 break; 1646 case _PC_NAME_MAX: 1647 *ap->a_retval = NAME_MAX; 1648 break; 1649 case _PC_PIPE_BUF: 1650 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1651 *ap->a_retval = PIPE_BUF; 1652 else 1653 error = EINVAL; 1654 break; 1655 case _PC_CHOWN_RESTRICTED: 1656 *ap->a_retval = 1; 1657 break; 1658 case _PC_NO_TRUNC: 1659 *ap->a_retval = 1; 1660 break; 1661 1662 #ifdef UFS_ACL 1663 case _PC_ACL_EXTENDED: 1664 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1665 *ap->a_retval = 1; 1666 else 1667 *ap->a_retval = 0; 1668 break; 1669 case _PC_ACL_PATH_MAX: 1670 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1671 *ap->a_retval = ACL_MAX_ENTRIES; 1672 else 1673 *ap->a_retval = 3; 1674 break; 1675 #endif /* UFS_ACL */ 1676 1677 case _PC_MIN_HOLE_SIZE: 1678 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1679 break; 1680 case _PC_PRIO_IO: 1681 *ap->a_retval = 0; 1682 break; 1683 case _PC_SYNC_IO: 1684 *ap->a_retval = 0; 1685 break; 1686 case _PC_ALLOC_SIZE_MIN: 1687 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1688 break; 1689 case _PC_FILESIZEBITS: 1690 *ap->a_retval = 64; 1691 break; 1692 case _PC_REC_INCR_XFER_SIZE: 1693 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1694 break; 1695 case _PC_REC_MAX_XFER_SIZE: 1696 *ap->a_retval = -1; /* means ``unlimited'' */ 1697 break; 1698 case _PC_REC_MIN_XFER_SIZE: 1699 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1700 break; 1701 case _PC_REC_XFER_ALIGN: 1702 *ap->a_retval = PAGE_SIZE; 1703 break; 1704 case _PC_SYMLINK_MAX: 1705 *ap->a_retval = MAXPATHLEN; 1706 break; 1707 1708 default: 1709 error = vop_stdpathconf(ap); 1710 break; 1711 } 1712 return (error); 1713 } 1714 1715 /* 1716 * Vnode operation to remove a named attribute. 1717 */ 1718 static int 1719 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1720 { 1721 struct inode *ip; 1722 struct m_ext2fs *fs; 1723 int error; 1724 1725 ip = VTOI(ap->a_vp); 1726 fs = ip->i_e2fs; 1727 1728 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1729 return (EOPNOTSUPP); 1730 1731 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1732 return (EOPNOTSUPP); 1733 1734 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1735 ap->a_cred, ap->a_td, VWRITE); 1736 if (error) 1737 return (error); 1738 1739 error = ENOATTR; 1740 1741 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1742 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1743 if (error != ENOATTR) 1744 return (error); 1745 } 1746 1747 if (ip->i_facl) 1748 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1749 1750 return (error); 1751 } 1752 1753 /* 1754 * Vnode operation to retrieve a named extended attribute. 1755 */ 1756 static int 1757 ext2_getextattr(struct vop_getextattr_args *ap) 1758 { 1759 struct inode *ip; 1760 struct m_ext2fs *fs; 1761 int error; 1762 1763 ip = VTOI(ap->a_vp); 1764 fs = ip->i_e2fs; 1765 1766 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1767 return (EOPNOTSUPP); 1768 1769 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1770 return (EOPNOTSUPP); 1771 1772 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1773 ap->a_cred, ap->a_td, VREAD); 1774 if (error) 1775 return (error); 1776 1777 if (ap->a_size != NULL) 1778 *ap->a_size = 0; 1779 1780 error = ENOATTR; 1781 1782 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1783 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1784 ap->a_name, ap->a_uio, ap->a_size); 1785 if (error != ENOATTR) 1786 return (error); 1787 } 1788 1789 if (ip->i_facl) 1790 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1791 ap->a_name, ap->a_uio, ap->a_size); 1792 1793 return (error); 1794 } 1795 1796 /* 1797 * Vnode operation to retrieve extended attributes on a vnode. 1798 */ 1799 static int 1800 ext2_listextattr(struct vop_listextattr_args *ap) 1801 { 1802 struct inode *ip; 1803 struct m_ext2fs *fs; 1804 int error; 1805 1806 ip = VTOI(ap->a_vp); 1807 fs = ip->i_e2fs; 1808 1809 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1810 return (EOPNOTSUPP); 1811 1812 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1813 return (EOPNOTSUPP); 1814 1815 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1816 ap->a_cred, ap->a_td, VREAD); 1817 if (error) 1818 return (error); 1819 1820 if (ap->a_size != NULL) 1821 *ap->a_size = 0; 1822 1823 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1824 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1825 ap->a_uio, ap->a_size); 1826 if (error) 1827 return (error); 1828 } 1829 1830 if (ip->i_facl) 1831 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1832 ap->a_uio, ap->a_size); 1833 1834 return (error); 1835 } 1836 1837 /* 1838 * Vnode operation to set a named attribute. 1839 */ 1840 static int 1841 ext2_setextattr(struct vop_setextattr_args *ap) 1842 { 1843 struct inode *ip; 1844 struct m_ext2fs *fs; 1845 int error; 1846 1847 ip = VTOI(ap->a_vp); 1848 fs = ip->i_e2fs; 1849 1850 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1851 return (EOPNOTSUPP); 1852 1853 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1854 return (EOPNOTSUPP); 1855 1856 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1857 ap->a_cred, ap->a_td, VWRITE); 1858 if (error) 1859 return (error); 1860 1861 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1862 if (error) 1863 return (error); 1864 1865 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1866 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1867 ap->a_name, ap->a_uio); 1868 if (error != ENOSPC) 1869 return (error); 1870 } 1871 1872 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1873 ap->a_name, ap->a_uio); 1874 1875 return (error); 1876 } 1877 1878 /* 1879 * Vnode pointer to File handle 1880 */ 1881 /* ARGSUSED */ 1882 static int 1883 ext2_vptofh(struct vop_vptofh_args *ap) 1884 { 1885 struct inode *ip; 1886 struct ufid *ufhp; 1887 1888 ip = VTOI(ap->a_vp); 1889 ufhp = (struct ufid *)ap->a_fhp; 1890 ufhp->ufid_len = sizeof(struct ufid); 1891 ufhp->ufid_ino = ip->i_number; 1892 ufhp->ufid_gen = ip->i_gen; 1893 return (0); 1894 } 1895 1896 /* 1897 * Initialize the vnode associated with a new inode, handle aliased 1898 * vnodes. 1899 */ 1900 int 1901 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1902 { 1903 struct inode *ip; 1904 struct vnode *vp; 1905 1906 vp = *vpp; 1907 ip = VTOI(vp); 1908 vp->v_type = IFTOVT(ip->i_mode); 1909 /* 1910 * Only unallocated inodes should be of type VNON. 1911 */ 1912 if (ip->i_mode != 0 && vp->v_type == VNON) 1913 return (EINVAL); 1914 if (vp->v_type == VFIFO) 1915 vp->v_op = fifoops; 1916 1917 if (ip->i_number == EXT2_ROOTINO) 1918 vp->v_vflag |= VV_ROOT; 1919 ip->i_modrev = init_va_filerev(); 1920 *vpp = vp; 1921 return (0); 1922 } 1923 1924 /* 1925 * Allocate a new inode. 1926 */ 1927 static int 1928 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1929 struct componentname *cnp) 1930 { 1931 struct inode *ip, *pdir; 1932 struct vnode *tvp; 1933 int error; 1934 1935 pdir = VTOI(dvp); 1936 *vpp = NULL; 1937 if ((mode & IFMT) == 0) 1938 mode |= IFREG; 1939 1940 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1941 if (error) { 1942 return (error); 1943 } 1944 ip = VTOI(tvp); 1945 ip->i_gid = pdir->i_gid; 1946 #ifdef SUIDDIR 1947 { 1948 /* 1949 * if we are 1950 * not the owner of the directory, 1951 * and we are hacking owners here, (only do this where told to) 1952 * and we are not giving it TOO root, (would subvert quotas) 1953 * then go ahead and give it to the other user. 1954 * Note that this drops off the execute bits for security. 1955 */ 1956 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1957 (pdir->i_mode & ISUID) && 1958 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1959 ip->i_uid = pdir->i_uid; 1960 mode &= ~07111; 1961 } else { 1962 ip->i_uid = cnp->cn_cred->cr_uid; 1963 } 1964 } 1965 #else 1966 ip->i_uid = cnp->cn_cred->cr_uid; 1967 #endif 1968 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1969 ip->i_mode = mode; 1970 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1971 ip->i_nlink = 1; 1972 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1973 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 1974 ip->i_mode &= ~ISGID; 1975 } 1976 1977 if (cnp->cn_flags & ISWHITEOUT) 1978 ip->i_flags |= UF_OPAQUE; 1979 1980 /* 1981 * Make sure inode goes to disk before directory entry. 1982 */ 1983 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1984 if (error) 1985 goto bad; 1986 1987 #ifdef UFS_ACL 1988 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1989 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 1990 cnp->cn_cred, curthread); 1991 if (error) 1992 goto bad; 1993 } 1994 #endif /* UFS_ACL */ 1995 1996 error = ext2_direnter(ip, dvp, cnp); 1997 if (error) 1998 goto bad; 1999 2000 *vpp = tvp; 2001 return (0); 2002 2003 bad: 2004 /* 2005 * Write error occurred trying to update the inode 2006 * or the directory so must deallocate the inode. 2007 */ 2008 ip->i_nlink = 0; 2009 ip->i_flag |= IN_CHANGE; 2010 vput(tvp); 2011 return (error); 2012 } 2013 2014 /* 2015 * Vnode op for reading. 2016 */ 2017 static int 2018 ext2_read(struct vop_read_args *ap) 2019 { 2020 struct vnode *vp; 2021 struct inode *ip; 2022 struct uio *uio; 2023 struct m_ext2fs *fs; 2024 struct buf *bp; 2025 daddr_t lbn, nextlbn; 2026 off_t bytesinfile; 2027 long size, xfersize, blkoffset; 2028 int error, orig_resid, seqcount; 2029 int ioflag; 2030 2031 vp = ap->a_vp; 2032 uio = ap->a_uio; 2033 ioflag = ap->a_ioflag; 2034 2035 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2036 ip = VTOI(vp); 2037 2038 #ifdef INVARIANTS 2039 if (uio->uio_rw != UIO_READ) 2040 panic("%s: mode", "ext2_read"); 2041 2042 if (vp->v_type == VLNK) { 2043 if ((int)ip->i_size < 2044 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) 2045 panic("%s: short symlink", "ext2_read"); 2046 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2047 panic("%s: type %d", "ext2_read", vp->v_type); 2048 #endif 2049 orig_resid = uio->uio_resid; 2050 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2051 if (orig_resid == 0) 2052 return (0); 2053 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2054 fs = ip->i_e2fs; 2055 if (uio->uio_offset < ip->i_size && 2056 uio->uio_offset >= fs->e2fs_maxfilesize) 2057 return (EOVERFLOW); 2058 2059 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2060 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2061 break; 2062 lbn = lblkno(fs, uio->uio_offset); 2063 nextlbn = lbn + 1; 2064 size = blksize(fs, ip, lbn); 2065 blkoffset = blkoff(fs, uio->uio_offset); 2066 2067 xfersize = fs->e2fs_fsize - blkoffset; 2068 if (uio->uio_resid < xfersize) 2069 xfersize = uio->uio_resid; 2070 if (bytesinfile < xfersize) 2071 xfersize = bytesinfile; 2072 2073 if (lblktosize(fs, nextlbn) >= ip->i_size) 2074 error = bread(vp, lbn, size, NOCRED, &bp); 2075 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2076 error = cluster_read(vp, ip->i_size, lbn, size, 2077 NOCRED, blkoffset + uio->uio_resid, seqcount, 2078 0, &bp); 2079 } else if (seqcount > 1) { 2080 u_int nextsize = blksize(fs, ip, nextlbn); 2081 2082 error = breadn(vp, lbn, 2083 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2084 } else 2085 error = bread(vp, lbn, size, NOCRED, &bp); 2086 if (error) { 2087 brelse(bp); 2088 bp = NULL; 2089 break; 2090 } 2091 2092 /* 2093 * We should only get non-zero b_resid when an I/O error 2094 * has occurred, which should cause us to break above. 2095 * However, if the short read did not cause an error, 2096 * then we want to ensure that we do not uiomove bad 2097 * or uninitialized data. 2098 */ 2099 size -= bp->b_resid; 2100 if (size < xfersize) { 2101 if (size == 0) 2102 break; 2103 xfersize = size; 2104 } 2105 error = uiomove((char *)bp->b_data + blkoffset, 2106 (int)xfersize, uio); 2107 if (error) 2108 break; 2109 vfs_bio_brelse(bp, ioflag); 2110 } 2111 2112 /* 2113 * This can only happen in the case of an error because the loop 2114 * above resets bp to NULL on each iteration and on normal 2115 * completion has not set a new value into it. so it must have come 2116 * from a 'break' statement 2117 */ 2118 if (bp != NULL) 2119 vfs_bio_brelse(bp, ioflag); 2120 2121 if ((error == 0 || uio->uio_resid != orig_resid) && 2122 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2123 ip->i_flag |= IN_ACCESS; 2124 return (error); 2125 } 2126 2127 static int 2128 ext2_ioctl(struct vop_ioctl_args *ap) 2129 { 2130 struct vnode *vp; 2131 int error; 2132 2133 vp = ap->a_vp; 2134 switch (ap->a_command) { 2135 case FIOSEEKDATA: 2136 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) { 2137 error = vn_lock(vp, LK_SHARED); 2138 if (error == 0) { 2139 error = ext2_bmap_seekdata(vp, 2140 (off_t *)ap->a_data); 2141 VOP_UNLOCK(vp); 2142 } else 2143 error = EBADF; 2144 return (error); 2145 } 2146 case FIOSEEKHOLE: 2147 return (vn_bmap_seekhole(vp, ap->a_command, 2148 (off_t *)ap->a_data, ap->a_cred)); 2149 default: 2150 return (ENOTTY); 2151 } 2152 } 2153 2154 /* 2155 * Vnode op for writing. 2156 */ 2157 static int 2158 ext2_write(struct vop_write_args *ap) 2159 { 2160 struct vnode *vp; 2161 struct uio *uio; 2162 struct inode *ip; 2163 struct m_ext2fs *fs; 2164 struct buf *bp; 2165 daddr_t lbn; 2166 off_t osize; 2167 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2168 2169 ioflag = ap->a_ioflag; 2170 uio = ap->a_uio; 2171 vp = ap->a_vp; 2172 2173 seqcount = ioflag >> IO_SEQSHIFT; 2174 ip = VTOI(vp); 2175 2176 #ifdef INVARIANTS 2177 if (uio->uio_rw != UIO_WRITE) 2178 panic("%s: mode", "ext2_write"); 2179 #endif 2180 2181 switch (vp->v_type) { 2182 case VREG: 2183 if (ioflag & IO_APPEND) 2184 uio->uio_offset = ip->i_size; 2185 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2186 return (EPERM); 2187 /* FALLTHROUGH */ 2188 case VLNK: 2189 break; 2190 case VDIR: 2191 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2192 if ((ioflag & IO_SYNC) == 0) 2193 panic("ext2_write: nonsync dir write"); 2194 break; 2195 default: 2196 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2197 vp->v_type, (intmax_t)uio->uio_offset, 2198 (intmax_t)uio->uio_resid); 2199 } 2200 2201 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2202 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2203 fs = ip->i_e2fs; 2204 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2205 return (EFBIG); 2206 /* 2207 * Maybe this should be above the vnode op call, but so long as 2208 * file servers have no limits, I don't think it matters. 2209 */ 2210 error = vn_rlimit_fsize(vp, uio, uio->uio_td); 2211 if (error != 0) 2212 return (error); 2213 2214 resid = uio->uio_resid; 2215 osize = ip->i_size; 2216 if (seqcount > BA_SEQMAX) 2217 flags = BA_SEQMAX << BA_SEQSHIFT; 2218 else 2219 flags = seqcount << BA_SEQSHIFT; 2220 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2221 flags |= IO_SYNC; 2222 2223 for (error = 0; uio->uio_resid > 0;) { 2224 lbn = lblkno(fs, uio->uio_offset); 2225 blkoffset = blkoff(fs, uio->uio_offset); 2226 xfersize = fs->e2fs_fsize - blkoffset; 2227 if (uio->uio_resid < xfersize) 2228 xfersize = uio->uio_resid; 2229 if (uio->uio_offset + xfersize > ip->i_size) 2230 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2231 2232 /* 2233 * We must perform a read-before-write if the transfer size 2234 * does not cover the entire buffer. 2235 */ 2236 if (fs->e2fs_bsize > xfersize) 2237 flags |= BA_CLRBUF; 2238 else 2239 flags &= ~BA_CLRBUF; 2240 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2241 ap->a_cred, &bp, flags); 2242 if (error != 0) 2243 break; 2244 2245 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2246 bp->b_flags |= B_NOCACHE; 2247 if (uio->uio_offset + xfersize > ip->i_size) 2248 ip->i_size = uio->uio_offset + xfersize; 2249 size = blksize(fs, ip, lbn) - bp->b_resid; 2250 if (size < xfersize) 2251 xfersize = size; 2252 2253 error = 2254 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2255 /* 2256 * If the buffer is not already filled and we encounter an 2257 * error while trying to fill it, we have to clear out any 2258 * garbage data from the pages instantiated for the buffer. 2259 * If we do not, a failed uiomove() during a write can leave 2260 * the prior contents of the pages exposed to a userland mmap. 2261 * 2262 * Note that we need only clear buffers with a transfer size 2263 * equal to the block size because buffers with a shorter 2264 * transfer size were cleared above by the call to ext2_balloc() 2265 * with the BA_CLRBUF flag set. 2266 * 2267 * If the source region for uiomove identically mmaps the 2268 * buffer, uiomove() performed the NOP copy, and the buffer 2269 * content remains valid because the page fault handler 2270 * validated the pages. 2271 */ 2272 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2273 fs->e2fs_bsize == xfersize) 2274 vfs_bio_clrbuf(bp); 2275 2276 vfs_bio_set_flags(bp, ioflag); 2277 2278 /* 2279 * If IO_SYNC each buffer is written synchronously. Otherwise 2280 * if we have a severe page deficiency write the buffer 2281 * asynchronously. Otherwise try to cluster, and if that 2282 * doesn't do it then either do an async write (if O_DIRECT), 2283 * or a delayed write (if not). 2284 */ 2285 if (ioflag & IO_SYNC) { 2286 (void)bwrite(bp); 2287 } else if (vm_page_count_severe() || 2288 buf_dirty_count_severe() || 2289 (ioflag & IO_ASYNC)) { 2290 bp->b_flags |= B_CLUSTEROK; 2291 bawrite(bp); 2292 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2293 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2294 bp->b_flags |= B_CLUSTEROK; 2295 cluster_write(vp, &ip->i_clusterw, bp, 2296 ip->i_size, seqcount, 0); 2297 } else { 2298 bawrite(bp); 2299 } 2300 } else if (ioflag & IO_DIRECT) { 2301 bp->b_flags |= B_CLUSTEROK; 2302 bawrite(bp); 2303 } else { 2304 bp->b_flags |= B_CLUSTEROK; 2305 bdwrite(bp); 2306 } 2307 if (error || xfersize == 0) 2308 break; 2309 } 2310 /* 2311 * If we successfully wrote any data, and we are not the superuser 2312 * we clear the setuid and setgid bits as a precaution against 2313 * tampering. 2314 */ 2315 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2316 ap->a_cred) { 2317 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2318 ip->i_mode &= ~(ISUID | ISGID); 2319 } 2320 if (error) { 2321 if (ioflag & IO_UNIT) { 2322 (void)ext2_truncate(vp, osize, 2323 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2324 uio->uio_offset -= resid - uio->uio_resid; 2325 uio->uio_resid = resid; 2326 } 2327 } 2328 if (uio->uio_resid != resid) { 2329 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2330 if (ioflag & IO_SYNC) 2331 error = ext2_update(vp, 1); 2332 } 2333 return (error); 2334 } 2335