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 43 #include "opt_suiddir.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/fcntl.h> 49 #include <sys/filio.h> 50 #include <sys/limits.h> 51 #include <sys/sdt.h> 52 #include <sys/stat.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/endian.h> 56 #include <sys/priv.h> 57 #include <sys/rwlock.h> 58 #include <sys/mount.h> 59 #include <sys/unistd.h> 60 #include <sys/time.h> 61 #include <sys/vnode.h> 62 #include <sys/namei.h> 63 #include <sys/lockf.h> 64 #include <sys/event.h> 65 #include <sys/conf.h> 66 #include <sys/file.h> 67 #include <sys/extattr.h> 68 #include <sys/vmmeter.h> 69 70 #include <vm/vm.h> 71 #include <vm/vm_param.h> 72 #include <vm/vm_extern.h> 73 #include <vm/vm_object.h> 74 #include <vm/vm_page.h> 75 #include <vm/vm_pager.h> 76 #include <vm/vnode_pager.h> 77 78 #include "opt_directio.h" 79 80 #include <ufs/ufs/dir.h> 81 82 #include <fs/ext2fs/fs.h> 83 #include <fs/ext2fs/inode.h> 84 #include <fs/ext2fs/ext2_acl.h> 85 #include <fs/ext2fs/ext2fs.h> 86 #include <fs/ext2fs/ext2_extern.h> 87 #include <fs/ext2fs/ext2_dinode.h> 88 #include <fs/ext2fs/ext2_dir.h> 89 #include <fs/ext2fs/ext2_mount.h> 90 #include <fs/ext2fs/ext2_extattr.h> 91 #include <fs/ext2fs/ext2_extents.h> 92 93 SDT_PROVIDER_DECLARE(ext2fs); 94 /* 95 * ext2fs trace probe: 96 * arg0: verbosity. Higher numbers give more verbose messages 97 * arg1: Textual message 98 */ 99 SDT_PROBE_DEFINE2(ext2fs, , vnops, trace, "int", "char*"); 100 101 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 102 static void ext2_itimes_locked(struct vnode *); 103 104 static vop_access_t ext2_access; 105 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 106 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 107 struct thread *); 108 static vop_close_t ext2_close; 109 static vop_create_t ext2_create; 110 static vop_fsync_t ext2_fsync; 111 static vop_getattr_t ext2_getattr; 112 static vop_ioctl_t ext2_ioctl; 113 static vop_link_t ext2_link; 114 static vop_mkdir_t ext2_mkdir; 115 static vop_mknod_t ext2_mknod; 116 static vop_open_t ext2_open; 117 static vop_pathconf_t ext2_pathconf; 118 static vop_print_t ext2_print; 119 static vop_read_t ext2_read; 120 static vop_readlink_t ext2_readlink; 121 static vop_remove_t ext2_remove; 122 static vop_rename_t ext2_rename; 123 static vop_rmdir_t ext2_rmdir; 124 static vop_setattr_t ext2_setattr; 125 static vop_strategy_t ext2_strategy; 126 static vop_symlink_t ext2_symlink; 127 static vop_write_t ext2_write; 128 static vop_deleteextattr_t ext2_deleteextattr; 129 static vop_getextattr_t ext2_getextattr; 130 static vop_listextattr_t ext2_listextattr; 131 static vop_setextattr_t ext2_setextattr; 132 static vop_vptofh_t ext2_vptofh; 133 static vop_close_t ext2fifo_close; 134 135 /* Global vfs data structures for ext2. */ 136 struct vop_vector ext2_vnodeops = { 137 .vop_default = &default_vnodeops, 138 .vop_access = ext2_access, 139 .vop_bmap = ext2_bmap, 140 .vop_cachedlookup = ext2_lookup, 141 .vop_close = ext2_close, 142 .vop_create = ext2_create, 143 .vop_fsync = ext2_fsync, 144 .vop_getpages = vnode_pager_local_getpages, 145 .vop_getpages_async = vnode_pager_local_getpages_async, 146 .vop_getattr = ext2_getattr, 147 .vop_inactive = ext2_inactive, 148 .vop_ioctl = ext2_ioctl, 149 .vop_link = ext2_link, 150 .vop_lookup = vfs_cache_lookup, 151 .vop_mkdir = ext2_mkdir, 152 .vop_mknod = ext2_mknod, 153 .vop_open = ext2_open, 154 .vop_pathconf = ext2_pathconf, 155 .vop_poll = vop_stdpoll, 156 .vop_print = ext2_print, 157 .vop_read = ext2_read, 158 .vop_readdir = ext2_readdir, 159 .vop_readlink = ext2_readlink, 160 .vop_reallocblks = ext2_reallocblks, 161 .vop_reclaim = ext2_reclaim, 162 .vop_remove = ext2_remove, 163 .vop_rename = ext2_rename, 164 .vop_rmdir = ext2_rmdir, 165 .vop_setattr = ext2_setattr, 166 .vop_strategy = ext2_strategy, 167 .vop_symlink = ext2_symlink, 168 .vop_write = ext2_write, 169 .vop_deleteextattr = ext2_deleteextattr, 170 .vop_getextattr = ext2_getextattr, 171 .vop_listextattr = ext2_listextattr, 172 .vop_setextattr = ext2_setextattr, 173 #ifdef UFS_ACL 174 .vop_getacl = ext2_getacl, 175 .vop_setacl = ext2_setacl, 176 .vop_aclcheck = ext2_aclcheck, 177 #endif /* UFS_ACL */ 178 .vop_vptofh = ext2_vptofh, 179 }; 180 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops); 181 182 struct vop_vector ext2_fifoops = { 183 .vop_default = &fifo_specops, 184 .vop_access = ext2_access, 185 .vop_close = ext2fifo_close, 186 .vop_fsync = ext2_fsync, 187 .vop_getattr = ext2_getattr, 188 .vop_inactive = ext2_inactive, 189 .vop_pathconf = ext2_pathconf, 190 .vop_print = ext2_print, 191 .vop_read = VOP_PANIC, 192 .vop_reclaim = ext2_reclaim, 193 .vop_setattr = ext2_setattr, 194 .vop_write = VOP_PANIC, 195 .vop_vptofh = ext2_vptofh, 196 }; 197 VFS_VOP_VECTOR_REGISTER(ext2_fifoops); 198 199 /* 200 * A virgin directory (no blushing please). 201 * Note that the type and namlen fields are reversed relative to ext2. 202 * Also, we don't use `struct odirtemplate', since it would just cause 203 * endianness problems. 204 */ 205 static struct dirtemplate mastertemplate = { 206 0, htole16(12), 1, EXT2_FT_DIR, ".", 207 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".." 208 }; 209 static struct dirtemplate omastertemplate = { 210 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".", 211 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".." 212 }; 213 214 static void 215 ext2_itimes_locked(struct vnode *vp) 216 { 217 struct inode *ip; 218 struct timespec ts; 219 220 ASSERT_VI_LOCKED(vp, __func__); 221 222 ip = VTOI(vp); 223 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 224 return; 225 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 226 ip->i_flag |= IN_LAZYMOD; 227 else 228 ip->i_flag |= IN_MODIFIED; 229 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 230 vfs_timestamp(&ts); 231 if (ip->i_flag & IN_ACCESS) { 232 ip->i_atime = ts.tv_sec; 233 ip->i_atimensec = ts.tv_nsec; 234 } 235 if (ip->i_flag & IN_UPDATE) { 236 ip->i_mtime = ts.tv_sec; 237 ip->i_mtimensec = ts.tv_nsec; 238 ip->i_modrev++; 239 } 240 if (ip->i_flag & IN_CHANGE) { 241 ip->i_ctime = ts.tv_sec; 242 ip->i_ctimensec = ts.tv_nsec; 243 } 244 } 245 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 246 } 247 248 void 249 ext2_itimes(struct vnode *vp) 250 { 251 252 VI_LOCK(vp); 253 ext2_itimes_locked(vp); 254 VI_UNLOCK(vp); 255 } 256 257 /* 258 * Create a regular file 259 */ 260 static int 261 ext2_create(struct vop_create_args *ap) 262 { 263 int error; 264 265 error = 266 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 267 ap->a_dvp, ap->a_vpp, ap->a_cnp); 268 if (error != 0) 269 return (error); 270 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 271 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 272 return (0); 273 } 274 275 static int 276 ext2_open(struct vop_open_args *ap) 277 { 278 279 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 280 return (EOPNOTSUPP); 281 282 /* 283 * Files marked append-only must be opened for appending. 284 */ 285 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 286 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 287 return (EPERM); 288 289 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 290 291 return (0); 292 } 293 294 /* 295 * Close called. 296 * 297 * Update the times on the inode. 298 */ 299 static int 300 ext2_close(struct vop_close_args *ap) 301 { 302 struct vnode *vp = ap->a_vp; 303 304 VI_LOCK(vp); 305 if (vp->v_usecount > 1) 306 ext2_itimes_locked(vp); 307 VI_UNLOCK(vp); 308 return (0); 309 } 310 311 static int 312 ext2_access(struct vop_access_args *ap) 313 { 314 struct vnode *vp = ap->a_vp; 315 struct inode *ip = VTOI(vp); 316 accmode_t accmode = ap->a_accmode; 317 int error; 318 319 /* 320 * Disallow write attempts on read-only file systems; 321 * unless the file is a socket, fifo, or a block or 322 * character device resident on the file system. 323 */ 324 if (accmode & VWRITE) { 325 switch (vp->v_type) { 326 case VDIR: 327 case VLNK: 328 case VREG: 329 if (vp->v_mount->mnt_flag & MNT_RDONLY) 330 return (EROFS); 331 break; 332 default: 333 break; 334 } 335 } 336 337 /* If immutable bit set, nobody gets to write it. */ 338 if ((accmode & VWRITE) && (ip->i_flags & SF_IMMUTABLE)) 339 return (EPERM); 340 341 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 342 ap->a_accmode, ap->a_cred); 343 return (error); 344 } 345 346 static int 347 ext2_getattr(struct vop_getattr_args *ap) 348 { 349 struct vnode *vp = ap->a_vp; 350 struct inode *ip = VTOI(vp); 351 struct vattr *vap = ap->a_vap; 352 353 ext2_itimes(vp); 354 /* 355 * Copy from inode table 356 */ 357 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 358 vap->va_fileid = ip->i_number; 359 vap->va_mode = ip->i_mode & ~IFMT; 360 vap->va_nlink = ip->i_nlink; 361 vap->va_uid = ip->i_uid; 362 vap->va_gid = ip->i_gid; 363 vap->va_rdev = ip->i_rdev; 364 vap->va_size = ip->i_size; 365 vap->va_atime.tv_sec = ip->i_atime; 366 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 367 vap->va_mtime.tv_sec = ip->i_mtime; 368 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 369 vap->va_ctime.tv_sec = ip->i_ctime; 370 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 371 if (E2DI_HAS_XTIME(ip)) { 372 vap->va_birthtime.tv_sec = ip->i_birthtime; 373 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 374 } 375 vap->va_flags = ip->i_flags; 376 vap->va_gen = ip->i_gen; 377 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 378 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 379 vap->va_type = IFTOVT(ip->i_mode); 380 vap->va_filerev = ip->i_modrev; 381 return (0); 382 } 383 384 /* 385 * Set attribute vnode op. called from several syscalls 386 */ 387 static int 388 ext2_setattr(struct vop_setattr_args *ap) 389 { 390 struct vattr *vap = ap->a_vap; 391 struct vnode *vp = ap->a_vp; 392 struct inode *ip = VTOI(vp); 393 struct ucred *cred = ap->a_cred; 394 struct thread *td = curthread; 395 int error; 396 397 /* 398 * Check for unsettable attributes. 399 */ 400 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 401 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 402 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 403 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 404 return (EINVAL); 405 } 406 if (vap->va_flags != VNOVAL) { 407 /* Disallow flags not supported by ext2fs. */ 408 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 409 return (EOPNOTSUPP); 410 411 if (vp->v_mount->mnt_flag & MNT_RDONLY) 412 return (EROFS); 413 /* 414 * Callers may only modify the file flags on objects they 415 * have VADMIN rights for. 416 */ 417 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 418 return (error); 419 /* 420 * Unprivileged processes and privileged processes in 421 * jail() are not permitted to unset system flags, or 422 * modify flags if any system flags are set. 423 * Privileged non-jail processes may not modify system flags 424 * if securelevel > 0 and any existing system flags are set. 425 */ 426 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 427 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 428 error = securelevel_gt(cred, 0); 429 if (error) 430 return (error); 431 } 432 } else { 433 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 434 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 435 return (EPERM); 436 } 437 ip->i_flags = vap->va_flags; 438 ip->i_flag |= IN_CHANGE; 439 if (ip->i_flags & (IMMUTABLE | APPEND)) 440 return (0); 441 } 442 if (ip->i_flags & (IMMUTABLE | APPEND)) 443 return (EPERM); 444 /* 445 * Go through the fields and update iff not VNOVAL. 446 */ 447 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 448 if (vp->v_mount->mnt_flag & MNT_RDONLY) 449 return (EROFS); 450 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 451 td)) != 0) 452 return (error); 453 } 454 if (vap->va_size != VNOVAL) { 455 /* 456 * Disallow write attempts on read-only file systems; 457 * unless the file is a socket, fifo, or a block or 458 * character device resident on the file system. 459 */ 460 switch (vp->v_type) { 461 case VDIR: 462 return (EISDIR); 463 case VLNK: 464 case VREG: 465 if (vp->v_mount->mnt_flag & MNT_RDONLY) 466 return (EROFS); 467 break; 468 default: 469 break; 470 } 471 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 472 return (error); 473 } 474 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 475 if (vp->v_mount->mnt_flag & MNT_RDONLY) 476 return (EROFS); 477 /* 478 * From utimes(2): 479 * If times is NULL, ... The caller must be the owner of 480 * the file, have permission to write the file, or be the 481 * super-user. 482 * If times is non-NULL, ... The caller must be the owner of 483 * the file or be the super-user. 484 */ 485 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 486 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 487 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 488 return (error); 489 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 490 if (vap->va_atime.tv_sec != VNOVAL) { 491 ip->i_flag &= ~IN_ACCESS; 492 ip->i_atime = vap->va_atime.tv_sec; 493 ip->i_atimensec = vap->va_atime.tv_nsec; 494 } 495 if (vap->va_mtime.tv_sec != VNOVAL) { 496 ip->i_flag &= ~IN_UPDATE; 497 ip->i_mtime = vap->va_mtime.tv_sec; 498 ip->i_mtimensec = vap->va_mtime.tv_nsec; 499 } 500 if (E2DI_HAS_XTIME(ip) && vap->va_birthtime.tv_sec != VNOVAL) { 501 ip->i_birthtime = vap->va_birthtime.tv_sec; 502 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 503 } 504 error = ext2_update(vp, 0); 505 if (error) 506 return (error); 507 } 508 error = 0; 509 if (vap->va_mode != (mode_t)VNOVAL) { 510 if (vp->v_mount->mnt_flag & MNT_RDONLY) 511 return (EROFS); 512 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 513 } 514 return (error); 515 } 516 517 /* 518 * Change the mode on a file. 519 * Inode must be locked before calling. 520 */ 521 static int 522 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 523 { 524 struct inode *ip = VTOI(vp); 525 int error; 526 527 /* 528 * To modify the permissions on a file, must possess VADMIN 529 * for that file. 530 */ 531 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 532 return (error); 533 /* 534 * Privileged processes may set the sticky bit on non-directories, 535 * as well as set the setgid bit on a file with a group that the 536 * process is not a member of. 537 */ 538 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 539 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 540 if (error) 541 return (EFTYPE); 542 } 543 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 544 error = priv_check_cred(cred, PRIV_VFS_SETGID); 545 if (error) 546 return (error); 547 } 548 ip->i_mode &= ~ALLPERMS; 549 ip->i_mode |= (mode & ALLPERMS); 550 ip->i_flag |= IN_CHANGE; 551 return (0); 552 } 553 554 /* 555 * Perform chown operation on inode ip; 556 * inode must be locked prior to call. 557 */ 558 static int 559 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 560 struct thread *td) 561 { 562 struct inode *ip = VTOI(vp); 563 uid_t ouid; 564 gid_t ogid; 565 int error = 0; 566 567 if (uid == (uid_t)VNOVAL) 568 uid = ip->i_uid; 569 if (gid == (gid_t)VNOVAL) 570 gid = ip->i_gid; 571 /* 572 * To modify the ownership of a file, must possess VADMIN 573 * for that file. 574 */ 575 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 576 return (error); 577 /* 578 * To change the owner of a file, or change the group of a file 579 * to a group of which we are not a member, the caller must 580 * have privilege. 581 */ 582 if (uid != ip->i_uid || (gid != ip->i_gid && 583 !groupmember(gid, cred))) { 584 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 585 if (error) 586 return (error); 587 } 588 ogid = ip->i_gid; 589 ouid = ip->i_uid; 590 ip->i_gid = gid; 591 ip->i_uid = uid; 592 ip->i_flag |= IN_CHANGE; 593 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 594 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 595 ip->i_mode &= ~(ISUID | ISGID); 596 } 597 return (0); 598 } 599 600 /* 601 * Synch an open file. 602 */ 603 /* ARGSUSED */ 604 static int 605 ext2_fsync(struct vop_fsync_args *ap) 606 { 607 /* 608 * Flush all dirty buffers associated with a vnode. 609 */ 610 611 vop_stdfsync(ap); 612 613 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 614 } 615 616 static int 617 ext2_check_mknod_limits(dev_t dev) 618 { 619 unsigned maj = major(dev); 620 unsigned min = minor(dev); 621 622 if (maj > EXT2_MAJOR_MAX || min > EXT2_MINOR_MAX) 623 return (EINVAL); 624 625 return (0); 626 } 627 628 /* 629 * Mknod vnode call 630 */ 631 /* ARGSUSED */ 632 static int 633 ext2_mknod(struct vop_mknod_args *ap) 634 { 635 struct vattr *vap = ap->a_vap; 636 struct vnode **vpp = ap->a_vpp; 637 struct inode *ip; 638 ino_t ino; 639 int error; 640 641 if (vap->va_rdev != VNOVAL) { 642 error = ext2_check_mknod_limits(vap->va_rdev); 643 if (error) 644 return (error); 645 } 646 647 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 648 ap->a_dvp, vpp, ap->a_cnp); 649 if (error) 650 return (error); 651 ip = VTOI(*vpp); 652 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 653 if (vap->va_rdev != VNOVAL) 654 ip->i_rdev = vap->va_rdev; 655 656 /* 657 * Remove inode, then reload it through VFS_VGET so it is 658 * checked to see if it is an alias of an existing entry in 659 * the inode cache. XXX I don't believe this is necessary now. 660 */ 661 (*vpp)->v_type = VNON; 662 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 663 vgone(*vpp); 664 vput(*vpp); 665 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 666 if (error) { 667 *vpp = NULL; 668 return (error); 669 } 670 return (0); 671 } 672 673 static int 674 ext2_remove(struct vop_remove_args *ap) 675 { 676 struct inode *ip; 677 struct vnode *vp = ap->a_vp; 678 struct vnode *dvp = ap->a_dvp; 679 int error; 680 681 ip = VTOI(vp); 682 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 683 (VTOI(dvp)->i_flags & APPEND)) { 684 error = EPERM; 685 goto out; 686 } 687 error = ext2_dirremove(dvp, ap->a_cnp); 688 if (error == 0) { 689 ip->i_nlink--; 690 ip->i_flag |= IN_CHANGE; 691 } 692 out: 693 return (error); 694 } 695 696 /* 697 * link vnode call 698 */ 699 static int 700 ext2_link(struct vop_link_args *ap) 701 { 702 struct vnode *vp = ap->a_vp; 703 struct vnode *tdvp = ap->a_tdvp; 704 struct componentname *cnp = ap->a_cnp; 705 struct inode *ip; 706 int error; 707 708 ip = VTOI(vp); 709 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 710 error = EMLINK; 711 goto out; 712 } 713 if (ip->i_flags & (IMMUTABLE | APPEND)) { 714 error = EPERM; 715 goto out; 716 } 717 ip->i_nlink++; 718 ip->i_flag |= IN_CHANGE; 719 error = ext2_update(vp, !DOINGASYNC(vp)); 720 if (!error) 721 error = ext2_direnter(ip, tdvp, cnp); 722 if (error) { 723 ip->i_nlink--; 724 ip->i_flag |= IN_CHANGE; 725 } 726 out: 727 return (error); 728 } 729 730 static int 731 ext2_inc_nlink(struct inode *ip) 732 { 733 734 ip->i_nlink++; 735 736 if (S_ISDIR(ip->i_mode) && 737 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 738 ip->i_nlink > 1) { 739 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 740 ip->i_nlink = 1; 741 } else if (ip->i_nlink > EXT4_LINK_MAX) { 742 ip->i_nlink--; 743 return (EMLINK); 744 } 745 746 return (0); 747 } 748 749 static void 750 ext2_dec_nlink(struct inode *ip) 751 { 752 753 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 754 ip->i_nlink--; 755 } 756 757 /* 758 * Rename system call. 759 * rename("foo", "bar"); 760 * is essentially 761 * unlink("bar"); 762 * link("foo", "bar"); 763 * unlink("foo"); 764 * but ``atomically''. Can't do full commit without saving state in the 765 * inode on disk which isn't feasible at this time. Best we can do is 766 * always guarantee the target exists. 767 * 768 * Basic algorithm is: 769 * 770 * 1) Bump link count on source while we're linking it to the 771 * target. This also ensure the inode won't be deleted out 772 * from underneath us while we work (it may be truncated by 773 * a concurrent `trunc' or `open' for creation). 774 * 2) Link source to destination. If destination already exists, 775 * delete it first. 776 * 3) Unlink source reference to inode if still around. If a 777 * directory was moved and the parent of the destination 778 * is different from the source, patch the ".." entry in the 779 * directory. 780 */ 781 static int 782 ext2_rename(struct vop_rename_args *ap) 783 { 784 struct vnode *tvp = ap->a_tvp; 785 struct vnode *tdvp = ap->a_tdvp; 786 struct vnode *fvp = ap->a_fvp; 787 struct vnode *fdvp = ap->a_fdvp; 788 struct componentname *tcnp = ap->a_tcnp; 789 struct componentname *fcnp = ap->a_fcnp; 790 struct inode *ip, *xp, *dp; 791 struct dirtemplate *dirbuf; 792 int doingdirectory = 0, oldparent = 0, newparent = 0; 793 int error = 0; 794 u_char namlen; 795 796 /* 797 * Check for cross-device rename. 798 */ 799 if ((fvp->v_mount != tdvp->v_mount) || 800 (tvp && (fvp->v_mount != tvp->v_mount))) { 801 error = EXDEV; 802 abortit: 803 if (tdvp == tvp) 804 vrele(tdvp); 805 else 806 vput(tdvp); 807 if (tvp) 808 vput(tvp); 809 vrele(fdvp); 810 vrele(fvp); 811 return (error); 812 } 813 814 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 815 (VTOI(tdvp)->i_flags & APPEND))) { 816 error = EPERM; 817 goto abortit; 818 } 819 820 /* 821 * Renaming a file to itself has no effect. The upper layers should 822 * not call us in that case. Temporarily just warn if they do. 823 */ 824 if (fvp == tvp) { 825 SDT_PROBE2(ext2fs, , vnops, trace, 1, 826 "rename: fvp == tvp (can't happen)"); 827 error = 0; 828 goto abortit; 829 } 830 831 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 832 goto abortit; 833 dp = VTOI(fdvp); 834 ip = VTOI(fvp); 835 if (ip->i_nlink >= EXT4_LINK_MAX && 836 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 837 VOP_UNLOCK(fvp); 838 error = EMLINK; 839 goto abortit; 840 } 841 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 842 || (dp->i_flags & APPEND)) { 843 VOP_UNLOCK(fvp); 844 error = EPERM; 845 goto abortit; 846 } 847 if ((ip->i_mode & IFMT) == IFDIR) { 848 /* 849 * Avoid ".", "..", and aliases of "." for obvious reasons. 850 */ 851 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 852 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 853 (ip->i_flag & IN_RENAME)) { 854 VOP_UNLOCK(fvp); 855 error = EINVAL; 856 goto abortit; 857 } 858 ip->i_flag |= IN_RENAME; 859 oldparent = dp->i_number; 860 doingdirectory++; 861 } 862 vrele(fdvp); 863 864 /* 865 * When the target exists, both the directory 866 * and target vnodes are returned locked. 867 */ 868 dp = VTOI(tdvp); 869 xp = NULL; 870 if (tvp) 871 xp = VTOI(tvp); 872 873 /* 874 * 1) Bump link count while we're moving stuff 875 * around. If we crash somewhere before 876 * completing our work, the link count 877 * may be wrong, but correctable. 878 */ 879 ext2_inc_nlink(ip); 880 ip->i_flag |= IN_CHANGE; 881 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 882 VOP_UNLOCK(fvp); 883 goto bad; 884 } 885 886 /* 887 * If ".." must be changed (ie the directory gets a new 888 * parent) then the source directory must not be in the 889 * directory hierarchy above the target, as this would 890 * orphan everything below the source directory. Also 891 * the user must have write permission in the source so 892 * as to be able to change "..". We must repeat the call 893 * to namei, as the parent directory is unlocked by the 894 * call to checkpath(). 895 */ 896 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread); 897 VOP_UNLOCK(fvp); 898 if (oldparent != dp->i_number) 899 newparent = dp->i_number; 900 if (doingdirectory && newparent) { 901 if (error) /* write access check above */ 902 goto bad; 903 if (xp != NULL) 904 vput(tvp); 905 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 906 if (error) 907 goto out; 908 VREF(tdvp); 909 error = vfs_relookup(tdvp, &tvp, tcnp, true); 910 if (error) 911 goto out; 912 vrele(tdvp); 913 dp = VTOI(tdvp); 914 xp = NULL; 915 if (tvp) 916 xp = VTOI(tvp); 917 } 918 /* 919 * 2) If target doesn't exist, link the target 920 * to the source and unlink the source. 921 * Otherwise, rewrite the target directory 922 * entry to reference the source inode and 923 * expunge the original entry's existence. 924 */ 925 if (xp == NULL) { 926 if (dp->i_devvp != ip->i_devvp) 927 panic("ext2_rename: EXDEV"); 928 /* 929 * Account for ".." in new directory. 930 * When source and destination have the same 931 * parent we don't fool with the link count. 932 */ 933 if (doingdirectory && newparent) { 934 error = ext2_inc_nlink(dp); 935 if (error) 936 goto bad; 937 938 dp->i_flag |= IN_CHANGE; 939 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 940 if (error) 941 goto bad; 942 } 943 error = ext2_direnter(ip, tdvp, tcnp); 944 if (error) { 945 if (doingdirectory && newparent) { 946 ext2_dec_nlink(dp); 947 dp->i_flag |= IN_CHANGE; 948 (void)ext2_update(tdvp, 1); 949 } 950 goto bad; 951 } 952 vput(tdvp); 953 } else { 954 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 955 panic("ext2_rename: EXDEV"); 956 /* 957 * Short circuit rename(foo, foo). 958 */ 959 if (xp->i_number == ip->i_number) 960 panic("ext2_rename: same file"); 961 /* 962 * If the parent directory is "sticky", then the user must 963 * own the parent directory, or the destination of the rename, 964 * otherwise the destination may not be changed (except by 965 * root). This implements append-only directories. 966 */ 967 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 968 tcnp->cn_cred->cr_uid != dp->i_uid && 969 xp->i_uid != tcnp->cn_cred->cr_uid) { 970 error = EPERM; 971 goto bad; 972 } 973 /* 974 * Target must be empty if a directory and have no links 975 * to it. Also, ensure source and target are compatible 976 * (both directories, or both not directories). 977 */ 978 if ((xp->i_mode & IFMT) == IFDIR) { 979 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 980 error = ENOTEMPTY; 981 goto bad; 982 } 983 if (!doingdirectory) { 984 error = ENOTDIR; 985 goto bad; 986 } 987 cache_purge(tdvp); 988 } else if (doingdirectory) { 989 error = EISDIR; 990 goto bad; 991 } 992 error = ext2_dirrewrite(dp, ip, tcnp); 993 if (error) 994 goto bad; 995 /* 996 * If the target directory is in the same 997 * directory as the source directory, 998 * decrement the link count on the parent 999 * of the target directory. 1000 */ 1001 if (doingdirectory && !newparent) { 1002 ext2_dec_nlink(dp); 1003 dp->i_flag |= IN_CHANGE; 1004 } 1005 vput(tdvp); 1006 /* 1007 * Adjust the link count of the target to 1008 * reflect the dirrewrite above. If this is 1009 * a directory it is empty and there are 1010 * no links to it, so we can squash the inode and 1011 * any space associated with it. We disallowed 1012 * renaming over top of a directory with links to 1013 * it above, as the remaining link would point to 1014 * a directory without "." or ".." entries. 1015 */ 1016 ext2_dec_nlink(xp); 1017 if (doingdirectory) { 1018 if (xp->i_nlink > 2) 1019 panic("ext2_rename: linked directory"); 1020 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1021 tcnp->cn_cred, curthread); 1022 xp->i_nlink = 0; 1023 } 1024 xp->i_flag |= IN_CHANGE; 1025 vput(tvp); 1026 xp = NULL; 1027 } 1028 1029 /* 1030 * 3) Unlink the source. 1031 */ 1032 fcnp->cn_flags &= ~MODMASK; 1033 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1034 VREF(fdvp); 1035 error = vfs_relookup(fdvp, &fvp, fcnp, true); 1036 if (error == 0) 1037 vrele(fdvp); 1038 if (fvp != NULL) { 1039 xp = VTOI(fvp); 1040 dp = VTOI(fdvp); 1041 } else { 1042 /* 1043 * From name has disappeared. IN_RENAME is not sufficient 1044 * to protect against directory races due to timing windows, 1045 * so we can't panic here. 1046 */ 1047 vrele(ap->a_fvp); 1048 return (0); 1049 } 1050 /* 1051 * Ensure that the directory entry still exists and has not 1052 * changed while the new name has been entered. If the source is 1053 * a file then the entry may have been unlinked or renamed. In 1054 * either case there is no further work to be done. If the source 1055 * is a directory then it cannot have been rmdir'ed; its link 1056 * count of three would cause a rmdir to fail with ENOTEMPTY. 1057 * The IN_RENAME flag ensures that it cannot be moved by another 1058 * rename. 1059 */ 1060 if (xp != ip) { 1061 /* 1062 * From name resolves to a different inode. IN_RENAME is 1063 * not sufficient protection against timing window races 1064 * so we can't panic here. 1065 */ 1066 } else { 1067 /* 1068 * If the source is a directory with a 1069 * new parent, the link count of the old 1070 * parent directory must be decremented 1071 * and ".." set to point to the new parent. 1072 */ 1073 if (doingdirectory && newparent) { 1074 ext2_dec_nlink(dp); 1075 dp->i_flag |= IN_CHANGE; 1076 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1077 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1078 ip->i_e2fs->e2fs_bsize, (off_t)0, 1079 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1080 tcnp->cn_cred, NOCRED, NULL, NULL); 1081 if (error == 0) { 1082 /* Like ufs little-endian: */ 1083 namlen = dirbuf->dotdot_type; 1084 if (namlen != 2 || 1085 dirbuf->dotdot_name[0] != '.' || 1086 dirbuf->dotdot_name[1] != '.') { 1087 /* 1088 * The filesystem is in corrupted state, 1089 * need to run fsck to fix mangled dir 1090 * entry. From other side this error 1091 * need to be ignored because it is 1092 * too difficult to revert directories 1093 * to state before rename from this 1094 * point. 1095 */ 1096 ext2_dirbad(xp, (doff_t)12, 1097 "rename: mangled dir"); 1098 } else { 1099 dirbuf->dotdot_ino = htole32(newparent); 1100 /* 1101 * dirblock 0 could be htree root, 1102 * try both csum update functions. 1103 */ 1104 ext2_dirent_csum_set(ip, 1105 (struct ext2fs_direct_2 *)dirbuf); 1106 ext2_dx_csum_set(ip, 1107 (struct ext2fs_direct_2 *)dirbuf); 1108 (void)vn_rdwr(UIO_WRITE, fvp, 1109 (caddr_t)dirbuf, 1110 ip->i_e2fs->e2fs_bsize, 1111 (off_t)0, UIO_SYSSPACE, 1112 IO_NODELOCKED | IO_SYNC | 1113 IO_NOMACCHECK, tcnp->cn_cred, 1114 NOCRED, NULL, NULL); 1115 cache_purge(fdvp); 1116 } 1117 } 1118 free(dirbuf, M_TEMP); 1119 } 1120 error = ext2_dirremove(fdvp, fcnp); 1121 if (!error) { 1122 ext2_dec_nlink(xp); 1123 xp->i_flag |= IN_CHANGE; 1124 } 1125 xp->i_flag &= ~IN_RENAME; 1126 } 1127 if (dp) 1128 vput(fdvp); 1129 if (xp) 1130 vput(fvp); 1131 vrele(ap->a_fvp); 1132 return (error); 1133 1134 bad: 1135 if (xp) 1136 vput(ITOV(xp)); 1137 vput(ITOV(dp)); 1138 out: 1139 if (doingdirectory) 1140 ip->i_flag &= ~IN_RENAME; 1141 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1142 ext2_dec_nlink(ip); 1143 ip->i_flag |= IN_CHANGE; 1144 ip->i_flag &= ~IN_RENAME; 1145 vput(fvp); 1146 } else 1147 vrele(fvp); 1148 return (error); 1149 } 1150 1151 #ifdef UFS_ACL 1152 static int 1153 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1154 mode_t dmode, struct ucred *cred, struct thread *td) 1155 { 1156 int error; 1157 struct inode *ip = VTOI(tvp); 1158 struct acl *dacl, *acl; 1159 1160 acl = acl_alloc(M_WAITOK); 1161 dacl = acl_alloc(M_WAITOK); 1162 1163 /* 1164 * Retrieve default ACL from parent, if any. 1165 */ 1166 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1167 switch (error) { 1168 case 0: 1169 /* 1170 * Retrieved a default ACL, so merge mode and ACL if 1171 * necessary. If the ACL is empty, fall through to 1172 * the "not defined or available" case. 1173 */ 1174 if (acl->acl_cnt != 0) { 1175 dmode = acl_posix1e_newfilemode(dmode, acl); 1176 ip->i_mode = dmode; 1177 *dacl = *acl; 1178 ext2_sync_acl_from_inode(ip, acl); 1179 break; 1180 } 1181 /* FALLTHROUGH */ 1182 1183 case EOPNOTSUPP: 1184 /* 1185 * Just use the mode as-is. 1186 */ 1187 ip->i_mode = dmode; 1188 error = 0; 1189 goto out; 1190 1191 default: 1192 goto out; 1193 } 1194 1195 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1196 if (error == 0) 1197 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1198 switch (error) { 1199 case 0: 1200 break; 1201 1202 case EOPNOTSUPP: 1203 /* 1204 * XXX: This should not happen, as EOPNOTSUPP above 1205 * was supposed to free acl. 1206 */ 1207 #ifdef DEBUG 1208 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1209 #endif /* DEBUG */ 1210 break; 1211 1212 default: 1213 goto out; 1214 } 1215 1216 out: 1217 acl_free(acl); 1218 acl_free(dacl); 1219 1220 return (error); 1221 } 1222 1223 static int 1224 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1225 mode_t mode, struct ucred *cred, struct thread *td) 1226 { 1227 int error; 1228 struct inode *ip = VTOI(tvp); 1229 struct acl *acl; 1230 1231 acl = acl_alloc(M_WAITOK); 1232 1233 /* 1234 * Retrieve default ACL for parent, if any. 1235 */ 1236 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1237 switch (error) { 1238 case 0: 1239 /* 1240 * Retrieved a default ACL, so merge mode and ACL if 1241 * necessary. 1242 */ 1243 if (acl->acl_cnt != 0) { 1244 /* 1245 * Two possible ways for default ACL to not 1246 * be present. First, the EA can be 1247 * undefined, or second, the default ACL can 1248 * be blank. If it's blank, fall through to 1249 * the it's not defined case. 1250 */ 1251 mode = acl_posix1e_newfilemode(mode, acl); 1252 ip->i_mode = mode; 1253 ext2_sync_acl_from_inode(ip, acl); 1254 break; 1255 } 1256 /* FALLTHROUGH */ 1257 1258 case EOPNOTSUPP: 1259 /* 1260 * Just use the mode as-is. 1261 */ 1262 ip->i_mode = mode; 1263 error = 0; 1264 goto out; 1265 1266 default: 1267 goto out; 1268 } 1269 1270 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1271 switch (error) { 1272 case 0: 1273 break; 1274 1275 case EOPNOTSUPP: 1276 /* 1277 * XXX: This should not happen, as EOPNOTSUPP above was 1278 * supposed to free acl. 1279 */ 1280 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1281 "but no VOP_SETACL()\n"); 1282 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1283 "but no VOP_SETACL()"); */ 1284 break; 1285 1286 default: 1287 goto out; 1288 } 1289 1290 out: 1291 acl_free(acl); 1292 1293 return (error); 1294 } 1295 1296 #endif /* UFS_ACL */ 1297 1298 /* 1299 * Mkdir system call 1300 */ 1301 static int 1302 ext2_mkdir(struct vop_mkdir_args *ap) 1303 { 1304 struct m_ext2fs *fs; 1305 struct vnode *dvp = ap->a_dvp; 1306 struct vattr *vap = ap->a_vap; 1307 struct componentname *cnp = ap->a_cnp; 1308 struct inode *ip, *dp; 1309 struct vnode *tvp; 1310 struct dirtemplate dirtemplate, *dtp; 1311 char *buf = NULL; 1312 int error, dmode; 1313 1314 dp = VTOI(dvp); 1315 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1316 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1317 error = EMLINK; 1318 goto out; 1319 } 1320 dmode = vap->va_mode & 0777; 1321 dmode |= IFDIR; 1322 /* 1323 * Must simulate part of ext2_makeinode here to acquire the inode, 1324 * but not have it entered in the parent directory. The entry is 1325 * made later after writing "." and ".." entries. 1326 */ 1327 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1328 if (error) 1329 goto out; 1330 ip = VTOI(tvp); 1331 fs = ip->i_e2fs; 1332 ip->i_gid = dp->i_gid; 1333 #ifdef SUIDDIR 1334 { 1335 /* 1336 * if we are hacking owners here, (only do this where told to) 1337 * and we are not giving it TOO root, (would subvert quotas) 1338 * then go ahead and give it to the other user. 1339 * The new directory also inherits the SUID bit. 1340 * If user's UID and dir UID are the same, 1341 * 'give it away' so that the SUID is still forced on. 1342 */ 1343 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1344 (dp->i_mode & ISUID) && dp->i_uid) { 1345 dmode |= ISUID; 1346 ip->i_uid = dp->i_uid; 1347 } else { 1348 ip->i_uid = cnp->cn_cred->cr_uid; 1349 } 1350 } 1351 #else 1352 ip->i_uid = cnp->cn_cred->cr_uid; 1353 #endif 1354 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1355 ip->i_mode = dmode; 1356 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1357 ip->i_nlink = 2; 1358 if (cnp->cn_flags & ISWHITEOUT) 1359 ip->i_flags |= UF_OPAQUE; 1360 error = ext2_update(tvp, 1); 1361 1362 /* 1363 * Bump link count in parent directory 1364 * to reflect work done below. Should 1365 * be done before reference is created 1366 * so reparation is possible if we crash. 1367 */ 1368 ext2_inc_nlink(dp); 1369 dp->i_flag |= IN_CHANGE; 1370 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1371 if (error) 1372 goto bad; 1373 1374 /* Initialize directory with "." and ".." from static template. */ 1375 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1376 EXT2F_INCOMPAT_FTYPE)) 1377 dtp = &mastertemplate; 1378 else 1379 dtp = &omastertemplate; 1380 dirtemplate = *dtp; 1381 dirtemplate.dot_ino = htole32(ip->i_number); 1382 dirtemplate.dotdot_ino = htole32(dp->i_number); 1383 /* 1384 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1385 * just redefine it - for this function only 1386 */ 1387 #undef DIRBLKSIZ 1388 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1389 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12); 1390 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1391 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1392 dirtemplate.dotdot_reclen = 1393 htole16(le16toh(dirtemplate.dotdot_reclen) - 1394 sizeof(struct ext2fs_direct_tail)); 1395 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1396 } 1397 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1398 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1399 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1400 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1401 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1402 NULL, NULL); 1403 if (error) { 1404 ext2_dec_nlink(dp); 1405 dp->i_flag |= IN_CHANGE; 1406 goto bad; 1407 } 1408 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1409 /* XXX should grow with balloc() */ 1410 panic("ext2_mkdir: blksize"); 1411 else { 1412 ip->i_size = DIRBLKSIZ; 1413 ip->i_flag |= IN_CHANGE; 1414 } 1415 1416 #ifdef UFS_ACL 1417 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1418 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1419 cnp->cn_cred, curthread); 1420 if (error) 1421 goto bad; 1422 } 1423 1424 #endif /* UFS_ACL */ 1425 1426 /* Directory set up, now install its entry in the parent directory. */ 1427 error = ext2_direnter(ip, dvp, cnp); 1428 if (error) { 1429 ext2_dec_nlink(dp); 1430 dp->i_flag |= IN_CHANGE; 1431 } 1432 bad: 1433 /* 1434 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1435 * for us because we set the link count to 0. 1436 */ 1437 if (error) { 1438 ip->i_nlink = 0; 1439 ip->i_flag |= IN_CHANGE; 1440 vput(tvp); 1441 } else 1442 *ap->a_vpp = tvp; 1443 out: 1444 free(buf, M_TEMP); 1445 return (error); 1446 #undef DIRBLKSIZ 1447 #define DIRBLKSIZ DEV_BSIZE 1448 } 1449 1450 /* 1451 * Rmdir system call. 1452 */ 1453 static int 1454 ext2_rmdir(struct vop_rmdir_args *ap) 1455 { 1456 struct vnode *vp = ap->a_vp; 1457 struct vnode *dvp = ap->a_dvp; 1458 struct componentname *cnp = ap->a_cnp; 1459 struct inode *ip, *dp; 1460 int error; 1461 1462 ip = VTOI(vp); 1463 dp = VTOI(dvp); 1464 1465 /* 1466 * Verify the directory is empty (and valid). 1467 * (Rmdir ".." won't be valid since 1468 * ".." will contain a reference to 1469 * the current directory and thus be 1470 * non-empty.) 1471 */ 1472 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1473 error = ENOTEMPTY; 1474 goto out; 1475 } 1476 if ((dp->i_flags & APPEND) 1477 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1478 error = EPERM; 1479 goto out; 1480 } 1481 /* 1482 * Delete reference to directory before purging 1483 * inode. If we crash in between, the directory 1484 * will be reattached to lost+found, 1485 */ 1486 error = ext2_dirremove(dvp, cnp); 1487 if (error) 1488 goto out; 1489 ext2_dec_nlink(dp); 1490 dp->i_flag |= IN_CHANGE; 1491 cache_purge(dvp); 1492 VOP_UNLOCK(dvp); 1493 /* 1494 * Truncate inode. The only stuff left 1495 * in the directory is "." and "..". 1496 */ 1497 ip->i_nlink = 0; 1498 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1499 curthread); 1500 cache_purge(ITOV(ip)); 1501 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1502 VOP_UNLOCK(vp); 1503 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1504 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1505 } 1506 out: 1507 return (error); 1508 } 1509 1510 /* 1511 * symlink -- make a symbolic link 1512 */ 1513 static int 1514 ext2_symlink(struct vop_symlink_args *ap) 1515 { 1516 struct vnode *vp, **vpp = ap->a_vpp; 1517 struct inode *ip; 1518 int len, error; 1519 1520 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1521 vpp, ap->a_cnp); 1522 if (error) 1523 return (error); 1524 vp = *vpp; 1525 len = strlen(ap->a_target); 1526 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1527 ip = VTOI(vp); 1528 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1529 ip->i_size = len; 1530 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1531 } else 1532 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1533 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1534 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1535 if (error) 1536 vput(vp); 1537 return (error); 1538 } 1539 1540 /* 1541 * Return target name of a symbolic link 1542 */ 1543 static int 1544 ext2_readlink(struct vop_readlink_args *ap) 1545 { 1546 struct vnode *vp = ap->a_vp; 1547 struct inode *ip = VTOI(vp); 1548 int isize; 1549 1550 isize = ip->i_size; 1551 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1552 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1553 return (0); 1554 } 1555 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1556 } 1557 1558 /* 1559 * Calculate the logical to physical mapping if not done already, 1560 * then call the device strategy routine. 1561 * 1562 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1563 * deadlock on memory. See ext2_bmap() for details. 1564 */ 1565 static int 1566 ext2_strategy(struct vop_strategy_args *ap) 1567 { 1568 struct buf *bp = ap->a_bp; 1569 struct vnode *vp = ap->a_vp; 1570 struct bufobj *bo; 1571 daddr_t blkno; 1572 int error; 1573 1574 if (vp->v_type == VBLK || vp->v_type == VCHR) 1575 panic("ext2_strategy: spec"); 1576 if (bp->b_blkno == bp->b_lblkno) { 1577 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1578 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1579 else 1580 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1581 1582 bp->b_blkno = blkno; 1583 if (error) { 1584 bp->b_error = error; 1585 bp->b_ioflags |= BIO_ERROR; 1586 bufdone(bp); 1587 return (0); 1588 } 1589 if ((long)bp->b_blkno == -1) 1590 vfs_bio_clrbuf(bp); 1591 } 1592 if ((long)bp->b_blkno == -1) { 1593 bufdone(bp); 1594 return (0); 1595 } 1596 bp->b_iooffset = dbtob(bp->b_blkno); 1597 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1598 BO_STRATEGY(bo, bp); 1599 return (0); 1600 } 1601 1602 /* 1603 * Print out the contents of an inode. 1604 */ 1605 static int 1606 ext2_print(struct vop_print_args *ap) 1607 { 1608 struct vnode *vp = ap->a_vp; 1609 struct inode *ip = VTOI(vp); 1610 1611 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1612 if (vp->v_type == VFIFO) 1613 fifo_printinfo(vp); 1614 printf("\n"); 1615 return (0); 1616 } 1617 1618 /* 1619 * Close wrapper for fifos. 1620 * 1621 * Update the times on the inode then do device close. 1622 */ 1623 static int 1624 ext2fifo_close(struct vop_close_args *ap) 1625 { 1626 struct vnode *vp = ap->a_vp; 1627 1628 VI_LOCK(vp); 1629 if (vp->v_usecount > 1) 1630 ext2_itimes_locked(vp); 1631 VI_UNLOCK(vp); 1632 return (fifo_specops.vop_close(ap)); 1633 } 1634 1635 /* 1636 * Return POSIX pathconf information applicable to ext2 filesystems. 1637 */ 1638 static int 1639 ext2_pathconf(struct vop_pathconf_args *ap) 1640 { 1641 int error = 0; 1642 1643 switch (ap->a_name) { 1644 case _PC_LINK_MAX: 1645 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1646 EXT2F_ROCOMPAT_DIR_NLINK)) 1647 *ap->a_retval = INT_MAX; 1648 else 1649 *ap->a_retval = EXT4_LINK_MAX; 1650 break; 1651 case _PC_NAME_MAX: 1652 *ap->a_retval = NAME_MAX; 1653 break; 1654 case _PC_PIPE_BUF: 1655 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1656 *ap->a_retval = PIPE_BUF; 1657 else 1658 error = EINVAL; 1659 break; 1660 case _PC_CHOWN_RESTRICTED: 1661 *ap->a_retval = 1; 1662 break; 1663 case _PC_NO_TRUNC: 1664 *ap->a_retval = 1; 1665 break; 1666 1667 #ifdef UFS_ACL 1668 case _PC_ACL_EXTENDED: 1669 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1670 *ap->a_retval = 1; 1671 else 1672 *ap->a_retval = 0; 1673 break; 1674 case _PC_ACL_PATH_MAX: 1675 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1676 *ap->a_retval = ACL_MAX_ENTRIES; 1677 else 1678 *ap->a_retval = 3; 1679 break; 1680 #endif /* UFS_ACL */ 1681 1682 case _PC_MIN_HOLE_SIZE: 1683 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1684 break; 1685 case _PC_PRIO_IO: 1686 *ap->a_retval = 0; 1687 break; 1688 case _PC_SYNC_IO: 1689 *ap->a_retval = 0; 1690 break; 1691 case _PC_ALLOC_SIZE_MIN: 1692 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1693 break; 1694 case _PC_FILESIZEBITS: 1695 *ap->a_retval = 64; 1696 break; 1697 case _PC_REC_INCR_XFER_SIZE: 1698 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1699 break; 1700 case _PC_REC_MAX_XFER_SIZE: 1701 *ap->a_retval = -1; /* means ``unlimited'' */ 1702 break; 1703 case _PC_REC_MIN_XFER_SIZE: 1704 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1705 break; 1706 case _PC_REC_XFER_ALIGN: 1707 *ap->a_retval = PAGE_SIZE; 1708 break; 1709 case _PC_SYMLINK_MAX: 1710 *ap->a_retval = MAXPATHLEN; 1711 break; 1712 1713 default: 1714 error = vop_stdpathconf(ap); 1715 break; 1716 } 1717 return (error); 1718 } 1719 1720 /* 1721 * Vnode operation to remove a named attribute. 1722 */ 1723 static int 1724 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1725 { 1726 struct inode *ip; 1727 struct m_ext2fs *fs; 1728 int error; 1729 1730 ip = VTOI(ap->a_vp); 1731 fs = ip->i_e2fs; 1732 1733 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1734 return (EOPNOTSUPP); 1735 1736 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1737 return (EOPNOTSUPP); 1738 1739 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1740 ap->a_cred, ap->a_td, VWRITE); 1741 if (error) 1742 return (error); 1743 1744 error = ENOATTR; 1745 1746 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1747 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1748 if (error != ENOATTR) 1749 return (error); 1750 } 1751 1752 if (ip->i_facl) 1753 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1754 1755 return (error); 1756 } 1757 1758 /* 1759 * Vnode operation to retrieve a named extended attribute. 1760 */ 1761 static int 1762 ext2_getextattr(struct vop_getextattr_args *ap) 1763 { 1764 struct inode *ip; 1765 struct m_ext2fs *fs; 1766 int error; 1767 1768 ip = VTOI(ap->a_vp); 1769 fs = ip->i_e2fs; 1770 1771 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1772 return (EOPNOTSUPP); 1773 1774 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1775 return (EOPNOTSUPP); 1776 1777 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1778 ap->a_cred, ap->a_td, VREAD); 1779 if (error) 1780 return (error); 1781 1782 if (ap->a_size != NULL) 1783 *ap->a_size = 0; 1784 1785 error = ENOATTR; 1786 1787 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1788 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1789 ap->a_name, ap->a_uio, ap->a_size); 1790 if (error != ENOATTR) 1791 return (error); 1792 } 1793 1794 if (ip->i_facl) 1795 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1796 ap->a_name, ap->a_uio, ap->a_size); 1797 1798 return (error); 1799 } 1800 1801 /* 1802 * Vnode operation to retrieve extended attributes on a vnode. 1803 */ 1804 static int 1805 ext2_listextattr(struct vop_listextattr_args *ap) 1806 { 1807 struct inode *ip; 1808 struct m_ext2fs *fs; 1809 int error; 1810 1811 ip = VTOI(ap->a_vp); 1812 fs = ip->i_e2fs; 1813 1814 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1815 return (EOPNOTSUPP); 1816 1817 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1818 return (EOPNOTSUPP); 1819 1820 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1821 ap->a_cred, ap->a_td, VREAD); 1822 if (error) 1823 return (error); 1824 1825 if (ap->a_size != NULL) 1826 *ap->a_size = 0; 1827 1828 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1829 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1830 ap->a_uio, ap->a_size); 1831 if (error) 1832 return (error); 1833 } 1834 1835 if (ip->i_facl) 1836 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1837 ap->a_uio, ap->a_size); 1838 1839 return (error); 1840 } 1841 1842 /* 1843 * Vnode operation to set a named attribute. 1844 */ 1845 static int 1846 ext2_setextattr(struct vop_setextattr_args *ap) 1847 { 1848 struct inode *ip; 1849 struct m_ext2fs *fs; 1850 int error; 1851 1852 ip = VTOI(ap->a_vp); 1853 fs = ip->i_e2fs; 1854 1855 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1856 return (EOPNOTSUPP); 1857 1858 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1859 return (EOPNOTSUPP); 1860 1861 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1862 ap->a_cred, ap->a_td, VWRITE); 1863 if (error) 1864 return (error); 1865 1866 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1867 if (error) 1868 return (error); 1869 1870 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1871 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1872 ap->a_name, ap->a_uio); 1873 if (error != ENOSPC) 1874 return (error); 1875 } 1876 1877 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1878 ap->a_name, ap->a_uio); 1879 1880 return (error); 1881 } 1882 1883 /* 1884 * Vnode pointer to File handle 1885 */ 1886 /* ARGSUSED */ 1887 static int 1888 ext2_vptofh(struct vop_vptofh_args *ap) 1889 { 1890 struct inode *ip; 1891 struct ufid *ufhp; 1892 1893 ip = VTOI(ap->a_vp); 1894 ufhp = (struct ufid *)ap->a_fhp; 1895 ufhp->ufid_len = sizeof(struct ufid); 1896 ufhp->ufid_ino = ip->i_number; 1897 ufhp->ufid_gen = ip->i_gen; 1898 return (0); 1899 } 1900 1901 /* 1902 * Initialize the vnode associated with a new inode, handle aliased 1903 * vnodes. 1904 */ 1905 int 1906 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1907 { 1908 struct inode *ip; 1909 struct vnode *vp; 1910 1911 vp = *vpp; 1912 ip = VTOI(vp); 1913 vp->v_type = IFTOVT(ip->i_mode); 1914 /* 1915 * Only unallocated inodes should be of type VNON. 1916 */ 1917 if (ip->i_mode != 0 && vp->v_type == VNON) 1918 return (EINVAL); 1919 if (vp->v_type == VFIFO) 1920 vp->v_op = fifoops; 1921 1922 if (ip->i_number == EXT2_ROOTINO) 1923 vp->v_vflag |= VV_ROOT; 1924 ip->i_modrev = init_va_filerev(); 1925 *vpp = vp; 1926 return (0); 1927 } 1928 1929 /* 1930 * Allocate a new inode. 1931 */ 1932 static int 1933 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1934 struct componentname *cnp) 1935 { 1936 struct inode *ip, *pdir; 1937 struct vnode *tvp; 1938 int error; 1939 1940 pdir = VTOI(dvp); 1941 *vpp = NULL; 1942 if ((mode & IFMT) == 0) 1943 mode |= IFREG; 1944 1945 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1946 if (error) { 1947 return (error); 1948 } 1949 ip = VTOI(tvp); 1950 ip->i_gid = pdir->i_gid; 1951 #ifdef SUIDDIR 1952 { 1953 /* 1954 * if we are 1955 * not the owner of the directory, 1956 * and we are hacking owners here, (only do this where told to) 1957 * and we are not giving it TOO root, (would subvert quotas) 1958 * then go ahead and give it to the other user. 1959 * Note that this drops off the execute bits for security. 1960 */ 1961 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1962 (pdir->i_mode & ISUID) && 1963 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1964 ip->i_uid = pdir->i_uid; 1965 mode &= ~07111; 1966 } else { 1967 ip->i_uid = cnp->cn_cred->cr_uid; 1968 } 1969 } 1970 #else 1971 ip->i_uid = cnp->cn_cred->cr_uid; 1972 #endif 1973 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1974 ip->i_mode = mode; 1975 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1976 ip->i_nlink = 1; 1977 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1978 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 1979 ip->i_mode &= ~ISGID; 1980 } 1981 1982 if (cnp->cn_flags & ISWHITEOUT) 1983 ip->i_flags |= UF_OPAQUE; 1984 1985 /* 1986 * Make sure inode goes to disk before directory entry. 1987 */ 1988 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1989 if (error) 1990 goto bad; 1991 1992 #ifdef UFS_ACL 1993 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1994 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 1995 cnp->cn_cred, curthread); 1996 if (error) 1997 goto bad; 1998 } 1999 #endif /* UFS_ACL */ 2000 2001 error = ext2_direnter(ip, dvp, cnp); 2002 if (error) 2003 goto bad; 2004 2005 *vpp = tvp; 2006 return (0); 2007 2008 bad: 2009 /* 2010 * Write error occurred trying to update the inode 2011 * or the directory so must deallocate the inode. 2012 */ 2013 ip->i_nlink = 0; 2014 ip->i_flag |= IN_CHANGE; 2015 vput(tvp); 2016 return (error); 2017 } 2018 2019 /* 2020 * Vnode op for reading. 2021 */ 2022 static int 2023 ext2_read(struct vop_read_args *ap) 2024 { 2025 struct vnode *vp; 2026 struct inode *ip; 2027 struct uio *uio; 2028 struct m_ext2fs *fs; 2029 struct buf *bp; 2030 daddr_t lbn, nextlbn; 2031 off_t bytesinfile; 2032 long size, xfersize, blkoffset; 2033 int error, orig_resid, seqcount; 2034 int ioflag; 2035 2036 vp = ap->a_vp; 2037 uio = ap->a_uio; 2038 ioflag = ap->a_ioflag; 2039 2040 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2041 ip = VTOI(vp); 2042 2043 #ifdef INVARIANTS 2044 if (uio->uio_rw != UIO_READ) 2045 panic("%s: mode", "ext2_read"); 2046 2047 if (vp->v_type == VLNK) { 2048 if ((int)ip->i_size < 2049 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) 2050 panic("%s: short symlink", "ext2_read"); 2051 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2052 panic("%s: type %d", "ext2_read", vp->v_type); 2053 #endif 2054 orig_resid = uio->uio_resid; 2055 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2056 if (orig_resid == 0) 2057 return (0); 2058 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2059 fs = ip->i_e2fs; 2060 if (uio->uio_offset < ip->i_size && 2061 uio->uio_offset >= fs->e2fs_maxfilesize) 2062 return (EOVERFLOW); 2063 2064 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2065 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2066 break; 2067 lbn = lblkno(fs, uio->uio_offset); 2068 nextlbn = lbn + 1; 2069 size = blksize(fs, ip, lbn); 2070 blkoffset = blkoff(fs, uio->uio_offset); 2071 2072 xfersize = fs->e2fs_fsize - blkoffset; 2073 if (uio->uio_resid < xfersize) 2074 xfersize = uio->uio_resid; 2075 if (bytesinfile < xfersize) 2076 xfersize = bytesinfile; 2077 2078 if (lblktosize(fs, nextlbn) >= ip->i_size) 2079 error = bread(vp, lbn, size, NOCRED, &bp); 2080 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2081 error = cluster_read(vp, ip->i_size, lbn, size, 2082 NOCRED, blkoffset + uio->uio_resid, seqcount, 2083 0, &bp); 2084 } else if (seqcount > 1) { 2085 u_int nextsize = blksize(fs, ip, nextlbn); 2086 2087 error = breadn(vp, lbn, 2088 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2089 } else 2090 error = bread(vp, lbn, size, NOCRED, &bp); 2091 if (error) { 2092 brelse(bp); 2093 bp = NULL; 2094 break; 2095 } 2096 2097 /* 2098 * We should only get non-zero b_resid when an I/O error 2099 * has occurred, which should cause us to break above. 2100 * However, if the short read did not cause an error, 2101 * then we want to ensure that we do not uiomove bad 2102 * or uninitialized data. 2103 */ 2104 size -= bp->b_resid; 2105 if (size < xfersize) { 2106 if (size == 0) 2107 break; 2108 xfersize = size; 2109 } 2110 error = uiomove((char *)bp->b_data + blkoffset, 2111 (int)xfersize, uio); 2112 if (error) 2113 break; 2114 vfs_bio_brelse(bp, ioflag); 2115 } 2116 2117 /* 2118 * This can only happen in the case of an error because the loop 2119 * above resets bp to NULL on each iteration and on normal 2120 * completion has not set a new value into it. so it must have come 2121 * from a 'break' statement 2122 */ 2123 if (bp != NULL) 2124 vfs_bio_brelse(bp, ioflag); 2125 2126 if ((error == 0 || uio->uio_resid != orig_resid) && 2127 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2128 ip->i_flag |= IN_ACCESS; 2129 return (error); 2130 } 2131 2132 static int 2133 ext2_ioctl(struct vop_ioctl_args *ap) 2134 { 2135 struct vnode *vp; 2136 int error; 2137 2138 vp = ap->a_vp; 2139 switch (ap->a_command) { 2140 case FIOSEEKDATA: 2141 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) { 2142 error = vn_lock(vp, LK_SHARED); 2143 if (error == 0) { 2144 error = ext2_bmap_seekdata(vp, 2145 (off_t *)ap->a_data); 2146 VOP_UNLOCK(vp); 2147 } else 2148 error = EBADF; 2149 return (error); 2150 } 2151 case FIOSEEKHOLE: 2152 return (vn_bmap_seekhole(vp, ap->a_command, 2153 (off_t *)ap->a_data, ap->a_cred)); 2154 default: 2155 return (ENOTTY); 2156 } 2157 } 2158 2159 /* 2160 * Vnode op for writing. 2161 */ 2162 static int 2163 ext2_write(struct vop_write_args *ap) 2164 { 2165 struct vnode *vp; 2166 struct uio *uio; 2167 struct inode *ip; 2168 struct m_ext2fs *fs; 2169 struct buf *bp; 2170 daddr_t lbn; 2171 off_t osize; 2172 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2173 2174 ioflag = ap->a_ioflag; 2175 uio = ap->a_uio; 2176 vp = ap->a_vp; 2177 2178 seqcount = ioflag >> IO_SEQSHIFT; 2179 ip = VTOI(vp); 2180 2181 #ifdef INVARIANTS 2182 if (uio->uio_rw != UIO_WRITE) 2183 panic("%s: mode", "ext2_write"); 2184 #endif 2185 2186 switch (vp->v_type) { 2187 case VREG: 2188 if (ioflag & IO_APPEND) 2189 uio->uio_offset = ip->i_size; 2190 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2191 return (EPERM); 2192 /* FALLTHROUGH */ 2193 case VLNK: 2194 break; 2195 case VDIR: 2196 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2197 if ((ioflag & IO_SYNC) == 0) 2198 panic("ext2_write: nonsync dir write"); 2199 break; 2200 default: 2201 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2202 vp->v_type, (intmax_t)uio->uio_offset, 2203 (intmax_t)uio->uio_resid); 2204 } 2205 2206 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2207 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2208 fs = ip->i_e2fs; 2209 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2210 return (EFBIG); 2211 /* 2212 * Maybe this should be above the vnode op call, but so long as 2213 * file servers have no limits, I don't think it matters. 2214 */ 2215 error = vn_rlimit_fsize(vp, uio, uio->uio_td); 2216 if (error != 0) 2217 return (error); 2218 2219 resid = uio->uio_resid; 2220 osize = ip->i_size; 2221 if (seqcount > BA_SEQMAX) 2222 flags = BA_SEQMAX << BA_SEQSHIFT; 2223 else 2224 flags = seqcount << BA_SEQSHIFT; 2225 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2226 flags |= IO_SYNC; 2227 2228 for (error = 0; uio->uio_resid > 0;) { 2229 lbn = lblkno(fs, uio->uio_offset); 2230 blkoffset = blkoff(fs, uio->uio_offset); 2231 xfersize = fs->e2fs_fsize - blkoffset; 2232 if (uio->uio_resid < xfersize) 2233 xfersize = uio->uio_resid; 2234 if (uio->uio_offset + xfersize > ip->i_size) 2235 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2236 2237 /* 2238 * We must perform a read-before-write if the transfer size 2239 * does not cover the entire buffer. 2240 */ 2241 if (fs->e2fs_bsize > xfersize) 2242 flags |= BA_CLRBUF; 2243 else 2244 flags &= ~BA_CLRBUF; 2245 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2246 ap->a_cred, &bp, flags); 2247 if (error != 0) 2248 break; 2249 2250 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2251 bp->b_flags |= B_NOCACHE; 2252 if (uio->uio_offset + xfersize > ip->i_size) 2253 ip->i_size = uio->uio_offset + xfersize; 2254 size = blksize(fs, ip, lbn) - bp->b_resid; 2255 if (size < xfersize) 2256 xfersize = size; 2257 2258 error = 2259 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2260 /* 2261 * If the buffer is not already filled and we encounter an 2262 * error while trying to fill it, we have to clear out any 2263 * garbage data from the pages instantiated for the buffer. 2264 * If we do not, a failed uiomove() during a write can leave 2265 * the prior contents of the pages exposed to a userland mmap. 2266 * 2267 * Note that we need only clear buffers with a transfer size 2268 * equal to the block size because buffers with a shorter 2269 * transfer size were cleared above by the call to ext2_balloc() 2270 * with the BA_CLRBUF flag set. 2271 * 2272 * If the source region for uiomove identically mmaps the 2273 * buffer, uiomove() performed the NOP copy, and the buffer 2274 * content remains valid because the page fault handler 2275 * validated the pages. 2276 */ 2277 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2278 fs->e2fs_bsize == xfersize) 2279 vfs_bio_clrbuf(bp); 2280 2281 vfs_bio_set_flags(bp, ioflag); 2282 2283 /* 2284 * If IO_SYNC each buffer is written synchronously. Otherwise 2285 * if we have a severe page deficiency write the buffer 2286 * asynchronously. Otherwise try to cluster, and if that 2287 * doesn't do it then either do an async write (if O_DIRECT), 2288 * or a delayed write (if not). 2289 */ 2290 if (ioflag & IO_SYNC) { 2291 (void)bwrite(bp); 2292 } else if (vm_page_count_severe() || 2293 buf_dirty_count_severe() || 2294 (ioflag & IO_ASYNC)) { 2295 bp->b_flags |= B_CLUSTEROK; 2296 bawrite(bp); 2297 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2298 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2299 bp->b_flags |= B_CLUSTEROK; 2300 cluster_write(vp, &ip->i_clusterw, bp, 2301 ip->i_size, seqcount, 0); 2302 } else { 2303 bawrite(bp); 2304 } 2305 } else if (ioflag & IO_DIRECT) { 2306 bp->b_flags |= B_CLUSTEROK; 2307 bawrite(bp); 2308 } else { 2309 bp->b_flags |= B_CLUSTEROK; 2310 bdwrite(bp); 2311 } 2312 if (error || xfersize == 0) 2313 break; 2314 } 2315 /* 2316 * If we successfully wrote any data, and we are not the superuser 2317 * we clear the setuid and setgid bits as a precaution against 2318 * tampering. 2319 */ 2320 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2321 ap->a_cred) { 2322 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2323 ip->i_mode &= ~(ISUID | ISGID); 2324 } 2325 if (error) { 2326 if (ioflag & IO_UNIT) { 2327 (void)ext2_truncate(vp, osize, 2328 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2329 uio->uio_offset -= resid - uio->uio_resid; 2330 uio->uio_resid = resid; 2331 } 2332 } 2333 if (uio->uio_resid != resid) { 2334 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2335 if (ioflag & IO_SYNC) 2336 error = ext2_update(vp, 1); 2337 } 2338 return (error); 2339 } 2340