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 static vop_kqfilter_t ext2fifo_kqfilter; 139 140 /* Global vfs data structures for ext2. */ 141 struct vop_vector ext2_vnodeops = { 142 .vop_default = &default_vnodeops, 143 .vop_access = ext2_access, 144 .vop_bmap = ext2_bmap, 145 .vop_cachedlookup = ext2_lookup, 146 .vop_close = ext2_close, 147 .vop_create = ext2_create, 148 .vop_fsync = ext2_fsync, 149 .vop_getpages = vnode_pager_local_getpages, 150 .vop_getpages_async = vnode_pager_local_getpages_async, 151 .vop_getattr = ext2_getattr, 152 .vop_inactive = ext2_inactive, 153 .vop_ioctl = ext2_ioctl, 154 .vop_link = ext2_link, 155 .vop_lookup = vfs_cache_lookup, 156 .vop_mkdir = ext2_mkdir, 157 .vop_mknod = ext2_mknod, 158 .vop_open = ext2_open, 159 .vop_pathconf = ext2_pathconf, 160 .vop_poll = vop_stdpoll, 161 .vop_print = ext2_print, 162 .vop_read = ext2_read, 163 .vop_readdir = ext2_readdir, 164 .vop_readlink = ext2_readlink, 165 .vop_reallocblks = ext2_reallocblks, 166 .vop_reclaim = ext2_reclaim, 167 .vop_remove = ext2_remove, 168 .vop_rename = ext2_rename, 169 .vop_rmdir = ext2_rmdir, 170 .vop_setattr = ext2_setattr, 171 .vop_strategy = ext2_strategy, 172 .vop_symlink = ext2_symlink, 173 .vop_write = ext2_write, 174 .vop_deleteextattr = ext2_deleteextattr, 175 .vop_getextattr = ext2_getextattr, 176 .vop_listextattr = ext2_listextattr, 177 .vop_setextattr = ext2_setextattr, 178 #ifdef UFS_ACL 179 .vop_getacl = ext2_getacl, 180 .vop_setacl = ext2_setacl, 181 .vop_aclcheck = ext2_aclcheck, 182 #endif /* UFS_ACL */ 183 .vop_vptofh = ext2_vptofh, 184 }; 185 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops); 186 187 struct vop_vector ext2_fifoops = { 188 .vop_default = &fifo_specops, 189 .vop_access = ext2_access, 190 .vop_close = ext2fifo_close, 191 .vop_fsync = ext2_fsync, 192 .vop_getattr = ext2_getattr, 193 .vop_inactive = ext2_inactive, 194 .vop_kqfilter = ext2fifo_kqfilter, 195 .vop_pathconf = ext2_pathconf, 196 .vop_print = ext2_print, 197 .vop_read = VOP_PANIC, 198 .vop_reclaim = ext2_reclaim, 199 .vop_setattr = ext2_setattr, 200 .vop_write = VOP_PANIC, 201 .vop_vptofh = ext2_vptofh, 202 }; 203 VFS_VOP_VECTOR_REGISTER(ext2_fifoops); 204 205 /* 206 * A virgin directory (no blushing please). 207 * Note that the type and namlen fields are reversed relative to ext2. 208 * Also, we don't use `struct odirtemplate', since it would just cause 209 * endianness problems. 210 */ 211 static struct dirtemplate mastertemplate = { 212 0, htole16(12), 1, EXT2_FT_DIR, ".", 213 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".." 214 }; 215 static struct dirtemplate omastertemplate = { 216 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".", 217 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".." 218 }; 219 220 static void 221 ext2_itimes_locked(struct vnode *vp) 222 { 223 struct inode *ip; 224 struct timespec ts; 225 226 ASSERT_VI_LOCKED(vp, __func__); 227 228 ip = VTOI(vp); 229 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 230 return; 231 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 232 ip->i_flag |= IN_LAZYMOD; 233 else 234 ip->i_flag |= IN_MODIFIED; 235 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 236 vfs_timestamp(&ts); 237 if (ip->i_flag & IN_ACCESS) { 238 ip->i_atime = ts.tv_sec; 239 ip->i_atimensec = ts.tv_nsec; 240 } 241 if (ip->i_flag & IN_UPDATE) { 242 ip->i_mtime = ts.tv_sec; 243 ip->i_mtimensec = ts.tv_nsec; 244 ip->i_modrev++; 245 } 246 if (ip->i_flag & IN_CHANGE) { 247 ip->i_ctime = ts.tv_sec; 248 ip->i_ctimensec = ts.tv_nsec; 249 } 250 } 251 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 252 } 253 254 void 255 ext2_itimes(struct vnode *vp) 256 { 257 258 VI_LOCK(vp); 259 ext2_itimes_locked(vp); 260 VI_UNLOCK(vp); 261 } 262 263 /* 264 * Create a regular file 265 */ 266 static int 267 ext2_create(struct vop_create_args *ap) 268 { 269 int error; 270 271 error = 272 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 273 ap->a_dvp, ap->a_vpp, ap->a_cnp); 274 if (error != 0) 275 return (error); 276 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 277 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 278 return (0); 279 } 280 281 static int 282 ext2_open(struct vop_open_args *ap) 283 { 284 285 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 286 return (EOPNOTSUPP); 287 288 /* 289 * Files marked append-only must be opened for appending. 290 */ 291 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 292 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 293 return (EPERM); 294 295 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 296 297 return (0); 298 } 299 300 /* 301 * Close called. 302 * 303 * Update the times on the inode. 304 */ 305 static int 306 ext2_close(struct vop_close_args *ap) 307 { 308 struct vnode *vp = ap->a_vp; 309 310 VI_LOCK(vp); 311 if (vp->v_usecount > 1) 312 ext2_itimes_locked(vp); 313 VI_UNLOCK(vp); 314 return (0); 315 } 316 317 static int 318 ext2_access(struct vop_access_args *ap) 319 { 320 struct vnode *vp = ap->a_vp; 321 struct inode *ip = VTOI(vp); 322 accmode_t accmode = ap->a_accmode; 323 int error; 324 325 if (vp->v_type == VBLK || vp->v_type == VCHR) 326 return (EOPNOTSUPP); 327 328 /* 329 * Disallow write attempts on read-only file systems; 330 * unless the file is a socket, fifo, or a block or 331 * character device resident on the file system. 332 */ 333 if (accmode & VWRITE) { 334 switch (vp->v_type) { 335 case VDIR: 336 case VLNK: 337 case VREG: 338 if (vp->v_mount->mnt_flag & MNT_RDONLY) 339 return (EROFS); 340 break; 341 default: 342 break; 343 } 344 } 345 346 /* If immutable bit set, nobody gets to write it. */ 347 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 348 return (EPERM); 349 350 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 351 ap->a_accmode, ap->a_cred); 352 return (error); 353 } 354 355 static int 356 ext2_getattr(struct vop_getattr_args *ap) 357 { 358 struct vnode *vp = ap->a_vp; 359 struct inode *ip = VTOI(vp); 360 struct vattr *vap = ap->a_vap; 361 362 ext2_itimes(vp); 363 /* 364 * Copy from inode table 365 */ 366 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 367 vap->va_fileid = ip->i_number; 368 vap->va_mode = ip->i_mode & ~IFMT; 369 vap->va_nlink = ip->i_nlink; 370 vap->va_uid = ip->i_uid; 371 vap->va_gid = ip->i_gid; 372 vap->va_rdev = ip->i_rdev; 373 vap->va_size = ip->i_size; 374 vap->va_atime.tv_sec = ip->i_atime; 375 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 376 vap->va_mtime.tv_sec = ip->i_mtime; 377 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 378 vap->va_ctime.tv_sec = ip->i_ctime; 379 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 380 if E2DI_HAS_XTIME(ip) { 381 vap->va_birthtime.tv_sec = ip->i_birthtime; 382 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 383 } 384 vap->va_flags = ip->i_flags; 385 vap->va_gen = ip->i_gen; 386 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 387 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 388 vap->va_type = IFTOVT(ip->i_mode); 389 vap->va_filerev = ip->i_modrev; 390 return (0); 391 } 392 393 /* 394 * Set attribute vnode op. called from several syscalls 395 */ 396 static int 397 ext2_setattr(struct vop_setattr_args *ap) 398 { 399 struct vattr *vap = ap->a_vap; 400 struct vnode *vp = ap->a_vp; 401 struct inode *ip = VTOI(vp); 402 struct ucred *cred = ap->a_cred; 403 struct thread *td = curthread; 404 int error; 405 406 /* 407 * Check for unsettable attributes. 408 */ 409 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 410 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 411 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 412 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 413 return (EINVAL); 414 } 415 if (vap->va_flags != VNOVAL) { 416 /* Disallow flags not supported by ext2fs. */ 417 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 418 return (EOPNOTSUPP); 419 420 if (vp->v_mount->mnt_flag & MNT_RDONLY) 421 return (EROFS); 422 /* 423 * Callers may only modify the file flags on objects they 424 * have VADMIN rights for. 425 */ 426 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 427 return (error); 428 /* 429 * Unprivileged processes and privileged processes in 430 * jail() are not permitted to unset system flags, or 431 * modify flags if any system flags are set. 432 * Privileged non-jail processes may not modify system flags 433 * if securelevel > 0 and any existing system flags are set. 434 */ 435 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 436 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 437 error = securelevel_gt(cred, 0); 438 if (error) 439 return (error); 440 } 441 } else { 442 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 443 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 444 return (EPERM); 445 } 446 ip->i_flags = vap->va_flags; 447 ip->i_flag |= IN_CHANGE; 448 if (ip->i_flags & (IMMUTABLE | APPEND)) 449 return (0); 450 } 451 if (ip->i_flags & (IMMUTABLE | APPEND)) 452 return (EPERM); 453 /* 454 * Go through the fields and update iff not VNOVAL. 455 */ 456 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 457 if (vp->v_mount->mnt_flag & MNT_RDONLY) 458 return (EROFS); 459 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 460 td)) != 0) 461 return (error); 462 } 463 if (vap->va_size != VNOVAL) { 464 /* 465 * Disallow write attempts on read-only file systems; 466 * unless the file is a socket, fifo, or a block or 467 * character device resident on the file system. 468 */ 469 switch (vp->v_type) { 470 case VDIR: 471 return (EISDIR); 472 case VLNK: 473 case VREG: 474 if (vp->v_mount->mnt_flag & MNT_RDONLY) 475 return (EROFS); 476 break; 477 default: 478 break; 479 } 480 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 481 return (error); 482 } 483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 484 if (vp->v_mount->mnt_flag & MNT_RDONLY) 485 return (EROFS); 486 /* 487 * From utimes(2): 488 * If times is NULL, ... The caller must be the owner of 489 * the file, have permission to write the file, or be the 490 * super-user. 491 * If times is non-NULL, ... The caller must be the owner of 492 * the file or be the super-user. 493 */ 494 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 495 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 496 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 497 return (error); 498 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 499 if (vap->va_atime.tv_sec != VNOVAL) { 500 ip->i_flag &= ~IN_ACCESS; 501 ip->i_atime = vap->va_atime.tv_sec; 502 ip->i_atimensec = vap->va_atime.tv_nsec; 503 } 504 if (vap->va_mtime.tv_sec != VNOVAL) { 505 ip->i_flag &= ~IN_UPDATE; 506 ip->i_mtime = vap->va_mtime.tv_sec; 507 ip->i_mtimensec = vap->va_mtime.tv_nsec; 508 } 509 ip->i_birthtime = vap->va_birthtime.tv_sec; 510 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 511 error = ext2_update(vp, 0); 512 if (error) 513 return (error); 514 } 515 error = 0; 516 if (vap->va_mode != (mode_t)VNOVAL) { 517 if (vp->v_mount->mnt_flag & MNT_RDONLY) 518 return (EROFS); 519 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 520 } 521 return (error); 522 } 523 524 /* 525 * Change the mode on a file. 526 * Inode must be locked before calling. 527 */ 528 static int 529 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 530 { 531 struct inode *ip = VTOI(vp); 532 int error; 533 534 /* 535 * To modify the permissions on a file, must possess VADMIN 536 * for that file. 537 */ 538 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 539 return (error); 540 /* 541 * Privileged processes may set the sticky bit on non-directories, 542 * as well as set the setgid bit on a file with a group that the 543 * process is not a member of. 544 */ 545 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 546 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 547 if (error) 548 return (EFTYPE); 549 } 550 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 551 error = priv_check_cred(cred, PRIV_VFS_SETGID); 552 if (error) 553 return (error); 554 } 555 ip->i_mode &= ~ALLPERMS; 556 ip->i_mode |= (mode & ALLPERMS); 557 ip->i_flag |= IN_CHANGE; 558 return (0); 559 } 560 561 /* 562 * Perform chown operation on inode ip; 563 * inode must be locked prior to call. 564 */ 565 static int 566 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 567 struct thread *td) 568 { 569 struct inode *ip = VTOI(vp); 570 uid_t ouid; 571 gid_t ogid; 572 int error = 0; 573 574 if (uid == (uid_t)VNOVAL) 575 uid = ip->i_uid; 576 if (gid == (gid_t)VNOVAL) 577 gid = ip->i_gid; 578 /* 579 * To modify the ownership of a file, must possess VADMIN 580 * for that file. 581 */ 582 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 583 return (error); 584 /* 585 * To change the owner of a file, or change the group of a file 586 * to a group of which we are not a member, the caller must 587 * have privilege. 588 */ 589 if (uid != ip->i_uid || (gid != ip->i_gid && 590 !groupmember(gid, cred))) { 591 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 592 if (error) 593 return (error); 594 } 595 ogid = ip->i_gid; 596 ouid = ip->i_uid; 597 ip->i_gid = gid; 598 ip->i_uid = uid; 599 ip->i_flag |= IN_CHANGE; 600 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 601 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 602 ip->i_mode &= ~(ISUID | ISGID); 603 } 604 return (0); 605 } 606 607 /* 608 * Synch an open file. 609 */ 610 /* ARGSUSED */ 611 static int 612 ext2_fsync(struct vop_fsync_args *ap) 613 { 614 /* 615 * Flush all dirty buffers associated with a vnode. 616 */ 617 618 vop_stdfsync(ap); 619 620 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 621 } 622 623 /* 624 * Mknod vnode call 625 */ 626 /* ARGSUSED */ 627 static int 628 ext2_mknod(struct vop_mknod_args *ap) 629 { 630 struct vattr *vap = ap->a_vap; 631 struct vnode **vpp = ap->a_vpp; 632 struct inode *ip; 633 ino_t ino; 634 int error; 635 636 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 637 ap->a_dvp, vpp, ap->a_cnp); 638 if (error) 639 return (error); 640 ip = VTOI(*vpp); 641 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 642 if (vap->va_rdev != VNOVAL) { 643 /* 644 * Want to be able to use this to make badblock 645 * inodes, so don't truncate the dev number. 646 */ 647 if (!(ip->i_flag & IN_E4EXTENTS)) 648 ip->i_rdev = vap->va_rdev; 649 } 650 /* 651 * Remove inode, then reload it through VFS_VGET so it is 652 * checked to see if it is an alias of an existing entry in 653 * the inode cache. XXX I don't believe this is necessary now. 654 */ 655 (*vpp)->v_type = VNON; 656 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 657 vgone(*vpp); 658 vput(*vpp); 659 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 660 if (error) { 661 *vpp = NULL; 662 return (error); 663 } 664 return (0); 665 } 666 667 static int 668 ext2_remove(struct vop_remove_args *ap) 669 { 670 struct inode *ip; 671 struct vnode *vp = ap->a_vp; 672 struct vnode *dvp = ap->a_dvp; 673 int error; 674 675 ip = VTOI(vp); 676 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 677 (VTOI(dvp)->i_flags & APPEND)) { 678 error = EPERM; 679 goto out; 680 } 681 error = ext2_dirremove(dvp, ap->a_cnp); 682 if (error == 0) { 683 ip->i_nlink--; 684 ip->i_flag |= IN_CHANGE; 685 } 686 out: 687 return (error); 688 } 689 690 /* 691 * link vnode call 692 */ 693 static int 694 ext2_link(struct vop_link_args *ap) 695 { 696 struct vnode *vp = ap->a_vp; 697 struct vnode *tdvp = ap->a_tdvp; 698 struct componentname *cnp = ap->a_cnp; 699 struct inode *ip; 700 int error; 701 702 #ifdef INVARIANTS 703 if ((cnp->cn_flags & HASBUF) == 0) 704 panic("ext2_link: no name"); 705 #endif 706 ip = VTOI(vp); 707 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 708 error = EMLINK; 709 goto out; 710 } 711 if (ip->i_flags & (IMMUTABLE | APPEND)) { 712 error = EPERM; 713 goto out; 714 } 715 ip->i_nlink++; 716 ip->i_flag |= IN_CHANGE; 717 error = ext2_update(vp, !DOINGASYNC(vp)); 718 if (!error) 719 error = ext2_direnter(ip, tdvp, cnp); 720 if (error) { 721 ip->i_nlink--; 722 ip->i_flag |= IN_CHANGE; 723 } 724 out: 725 return (error); 726 } 727 728 static int 729 ext2_inc_nlink(struct inode *ip) 730 { 731 732 ip->i_nlink++; 733 734 if (S_ISDIR(ip->i_mode) && 735 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 736 ip->i_nlink > 1) { 737 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 738 ip->i_nlink = 1; 739 } else if (ip->i_nlink > EXT4_LINK_MAX) { 740 ip->i_nlink--; 741 return (EMLINK); 742 } 743 744 return (0); 745 } 746 747 static void 748 ext2_dec_nlink(struct inode *ip) 749 { 750 751 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 752 ip->i_nlink--; 753 } 754 755 /* 756 * Rename system call. 757 * rename("foo", "bar"); 758 * is essentially 759 * unlink("bar"); 760 * link("foo", "bar"); 761 * unlink("foo"); 762 * but ``atomically''. Can't do full commit without saving state in the 763 * inode on disk which isn't feasible at this time. Best we can do is 764 * always guarantee the target exists. 765 * 766 * Basic algorithm is: 767 * 768 * 1) Bump link count on source while we're linking it to the 769 * target. This also ensure the inode won't be deleted out 770 * from underneath us while we work (it may be truncated by 771 * a concurrent `trunc' or `open' for creation). 772 * 2) Link source to destination. If destination already exists, 773 * delete it first. 774 * 3) Unlink source reference to inode if still around. If a 775 * directory was moved and the parent of the destination 776 * is different from the source, patch the ".." entry in the 777 * directory. 778 */ 779 static int 780 ext2_rename(struct vop_rename_args *ap) 781 { 782 struct vnode *tvp = ap->a_tvp; 783 struct vnode *tdvp = ap->a_tdvp; 784 struct vnode *fvp = ap->a_fvp; 785 struct vnode *fdvp = ap->a_fdvp; 786 struct componentname *tcnp = ap->a_tcnp; 787 struct componentname *fcnp = ap->a_fcnp; 788 struct inode *ip, *xp, *dp; 789 struct dirtemplate *dirbuf; 790 int doingdirectory = 0, oldparent = 0, newparent = 0; 791 int error = 0; 792 u_char namlen; 793 794 #ifdef INVARIANTS 795 if ((tcnp->cn_flags & HASBUF) == 0 || 796 (fcnp->cn_flags & HASBUF) == 0) 797 panic("ext2_rename: no name"); 798 #endif 799 /* 800 * Check for cross-device rename. 801 */ 802 if ((fvp->v_mount != tdvp->v_mount) || 803 (tvp && (fvp->v_mount != tvp->v_mount))) { 804 error = EXDEV; 805 abortit: 806 if (tdvp == tvp) 807 vrele(tdvp); 808 else 809 vput(tdvp); 810 if (tvp) 811 vput(tvp); 812 vrele(fdvp); 813 vrele(fvp); 814 return (error); 815 } 816 817 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 818 (VTOI(tdvp)->i_flags & APPEND))) { 819 error = EPERM; 820 goto abortit; 821 } 822 823 /* 824 * Renaming a file to itself has no effect. The upper layers should 825 * not call us in that case. Temporarily just warn if they do. 826 */ 827 if (fvp == tvp) { 828 SDT_PROBE2(ext2fs, , vnops, trace, 1, 829 "rename: fvp == tvp (can't happen)"); 830 error = 0; 831 goto abortit; 832 } 833 834 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 835 goto abortit; 836 dp = VTOI(fdvp); 837 ip = VTOI(fvp); 838 if (ip->i_nlink >= EXT4_LINK_MAX && 839 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 840 VOP_UNLOCK(fvp); 841 error = EMLINK; 842 goto abortit; 843 } 844 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 845 || (dp->i_flags & APPEND)) { 846 VOP_UNLOCK(fvp); 847 error = EPERM; 848 goto abortit; 849 } 850 if ((ip->i_mode & IFMT) == IFDIR) { 851 /* 852 * Avoid ".", "..", and aliases of "." for obvious reasons. 853 */ 854 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 855 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 856 (ip->i_flag & IN_RENAME)) { 857 VOP_UNLOCK(fvp); 858 error = EINVAL; 859 goto abortit; 860 } 861 ip->i_flag |= IN_RENAME; 862 oldparent = dp->i_number; 863 doingdirectory++; 864 } 865 vrele(fdvp); 866 867 /* 868 * When the target exists, both the directory 869 * and target vnodes are returned locked. 870 */ 871 dp = VTOI(tdvp); 872 xp = NULL; 873 if (tvp) 874 xp = VTOI(tvp); 875 876 /* 877 * 1) Bump link count while we're moving stuff 878 * around. If we crash somewhere before 879 * completing our work, the link count 880 * may be wrong, but correctable. 881 */ 882 ext2_inc_nlink(ip); 883 ip->i_flag |= IN_CHANGE; 884 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 885 VOP_UNLOCK(fvp); 886 goto bad; 887 } 888 889 /* 890 * If ".." must be changed (ie the directory gets a new 891 * parent) then the source directory must not be in the 892 * directory hierarchy above the target, as this would 893 * orphan everything below the source directory. Also 894 * the user must have write permission in the source so 895 * as to be able to change "..". We must repeat the call 896 * to namei, as the parent directory is unlocked by the 897 * call to checkpath(). 898 */ 899 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 900 VOP_UNLOCK(fvp); 901 if (oldparent != dp->i_number) 902 newparent = dp->i_number; 903 if (doingdirectory && newparent) { 904 if (error) /* write access check above */ 905 goto bad; 906 if (xp != NULL) 907 vput(tvp); 908 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 909 if (error) 910 goto out; 911 VREF(tdvp); 912 error = relookup(tdvp, &tvp, tcnp); 913 if (error) 914 goto out; 915 vrele(tdvp); 916 dp = VTOI(tdvp); 917 xp = NULL; 918 if (tvp) 919 xp = VTOI(tvp); 920 } 921 /* 922 * 2) If target doesn't exist, link the target 923 * to the source and unlink the source. 924 * Otherwise, rewrite the target directory 925 * entry to reference the source inode and 926 * expunge the original entry's existence. 927 */ 928 if (xp == NULL) { 929 if (dp->i_devvp != ip->i_devvp) 930 panic("ext2_rename: EXDEV"); 931 /* 932 * Account for ".." in new directory. 933 * When source and destination have the same 934 * parent we don't fool with the link count. 935 */ 936 if (doingdirectory && newparent) { 937 error = ext2_inc_nlink(dp); 938 if (error) 939 goto bad; 940 941 dp->i_flag |= IN_CHANGE; 942 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 943 if (error) 944 goto bad; 945 } 946 error = ext2_direnter(ip, tdvp, tcnp); 947 if (error) { 948 if (doingdirectory && newparent) { 949 ext2_dec_nlink(dp); 950 dp->i_flag |= IN_CHANGE; 951 (void)ext2_update(tdvp, 1); 952 } 953 goto bad; 954 } 955 vput(tdvp); 956 } else { 957 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 958 panic("ext2_rename: EXDEV"); 959 /* 960 * Short circuit rename(foo, foo). 961 */ 962 if (xp->i_number == ip->i_number) 963 panic("ext2_rename: same file"); 964 /* 965 * If the parent directory is "sticky", then the user must 966 * own the parent directory, or the destination of the rename, 967 * otherwise the destination may not be changed (except by 968 * root). This implements append-only directories. 969 */ 970 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 971 tcnp->cn_cred->cr_uid != dp->i_uid && 972 xp->i_uid != tcnp->cn_cred->cr_uid) { 973 error = EPERM; 974 goto bad; 975 } 976 /* 977 * Target must be empty if a directory and have no links 978 * to it. Also, ensure source and target are compatible 979 * (both directories, or both not directories). 980 */ 981 if ((xp->i_mode & IFMT) == IFDIR) { 982 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 983 error = ENOTEMPTY; 984 goto bad; 985 } 986 if (!doingdirectory) { 987 error = ENOTDIR; 988 goto bad; 989 } 990 cache_purge(tdvp); 991 } else if (doingdirectory) { 992 error = EISDIR; 993 goto bad; 994 } 995 error = ext2_dirrewrite(dp, ip, tcnp); 996 if (error) 997 goto bad; 998 /* 999 * If the target directory is in the same 1000 * directory as the source directory, 1001 * decrement the link count on the parent 1002 * of the target directory. 1003 */ 1004 if (doingdirectory && !newparent) { 1005 ext2_dec_nlink(dp); 1006 dp->i_flag |= IN_CHANGE; 1007 } 1008 vput(tdvp); 1009 /* 1010 * Adjust the link count of the target to 1011 * reflect the dirrewrite above. If this is 1012 * a directory it is empty and there are 1013 * no links to it, so we can squash the inode and 1014 * any space associated with it. We disallowed 1015 * renaming over top of a directory with links to 1016 * it above, as the remaining link would point to 1017 * a directory without "." or ".." entries. 1018 */ 1019 ext2_dec_nlink(xp); 1020 if (doingdirectory) { 1021 if (xp->i_nlink > 2) 1022 panic("ext2_rename: linked directory"); 1023 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1024 tcnp->cn_cred, tcnp->cn_thread); 1025 xp->i_nlink = 0; 1026 } 1027 xp->i_flag |= IN_CHANGE; 1028 vput(tvp); 1029 xp = NULL; 1030 } 1031 1032 /* 1033 * 3) Unlink the source. 1034 */ 1035 fcnp->cn_flags &= ~MODMASK; 1036 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1037 VREF(fdvp); 1038 error = relookup(fdvp, &fvp, fcnp); 1039 if (error == 0) 1040 vrele(fdvp); 1041 if (fvp != NULL) { 1042 xp = VTOI(fvp); 1043 dp = VTOI(fdvp); 1044 } else { 1045 /* 1046 * From name has disappeared. IN_RENAME is not sufficient 1047 * to protect against directory races due to timing windows, 1048 * so we can't panic here. 1049 */ 1050 vrele(ap->a_fvp); 1051 return (0); 1052 } 1053 /* 1054 * Ensure that the directory entry still exists and has not 1055 * changed while the new name has been entered. If the source is 1056 * a file then the entry may have been unlinked or renamed. In 1057 * either case there is no further work to be done. If the source 1058 * is a directory then it cannot have been rmdir'ed; its link 1059 * count of three would cause a rmdir to fail with ENOTEMPTY. 1060 * The IN_RENAME flag ensures that it cannot be moved by another 1061 * rename. 1062 */ 1063 if (xp != ip) { 1064 /* 1065 * From name resolves to a different inode. IN_RENAME is 1066 * not sufficient protection against timing window races 1067 * so we can't panic here. 1068 */ 1069 } else { 1070 /* 1071 * If the source is a directory with a 1072 * new parent, the link count of the old 1073 * parent directory must be decremented 1074 * and ".." set to point to the new parent. 1075 */ 1076 if (doingdirectory && newparent) { 1077 ext2_dec_nlink(dp); 1078 dp->i_flag |= IN_CHANGE; 1079 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1080 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1081 ip->i_e2fs->e2fs_bsize, (off_t)0, 1082 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1083 tcnp->cn_cred, NOCRED, NULL, NULL); 1084 if (error == 0) { 1085 /* Like ufs little-endian: */ 1086 namlen = dirbuf->dotdot_type; 1087 if (namlen != 2 || 1088 dirbuf->dotdot_name[0] != '.' || 1089 dirbuf->dotdot_name[1] != '.') { 1090 ext2_dirbad(xp, (doff_t)12, 1091 "rename: mangled dir"); 1092 } else { 1093 dirbuf->dotdot_ino = htole32(newparent); 1094 /* 1095 * dirblock 0 could be htree root, 1096 * try both csum update functions. 1097 */ 1098 ext2_dirent_csum_set(ip, 1099 (struct ext2fs_direct_2 *)dirbuf); 1100 ext2_dx_csum_set(ip, 1101 (struct ext2fs_direct_2 *)dirbuf); 1102 (void)vn_rdwr(UIO_WRITE, fvp, 1103 (caddr_t)dirbuf, 1104 ip->i_e2fs->e2fs_bsize, 1105 (off_t)0, UIO_SYSSPACE, 1106 IO_NODELOCKED | IO_SYNC | 1107 IO_NOMACCHECK, tcnp->cn_cred, 1108 NOCRED, NULL, NULL); 1109 cache_purge(fdvp); 1110 } 1111 } 1112 free(dirbuf, M_TEMP); 1113 } 1114 error = ext2_dirremove(fdvp, fcnp); 1115 if (!error) { 1116 ext2_dec_nlink(xp); 1117 xp->i_flag |= IN_CHANGE; 1118 } 1119 xp->i_flag &= ~IN_RENAME; 1120 } 1121 if (dp) 1122 vput(fdvp); 1123 if (xp) 1124 vput(fvp); 1125 vrele(ap->a_fvp); 1126 return (error); 1127 1128 bad: 1129 if (xp) 1130 vput(ITOV(xp)); 1131 vput(ITOV(dp)); 1132 out: 1133 if (doingdirectory) 1134 ip->i_flag &= ~IN_RENAME; 1135 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1136 ext2_dec_nlink(ip); 1137 ip->i_flag |= IN_CHANGE; 1138 ip->i_flag &= ~IN_RENAME; 1139 vput(fvp); 1140 } else 1141 vrele(fvp); 1142 return (error); 1143 } 1144 1145 #ifdef UFS_ACL 1146 static int 1147 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1148 mode_t dmode, struct ucred *cred, struct thread *td) 1149 { 1150 int error; 1151 struct inode *ip = VTOI(tvp); 1152 struct acl *dacl, *acl; 1153 1154 acl = acl_alloc(M_WAITOK); 1155 dacl = acl_alloc(M_WAITOK); 1156 1157 /* 1158 * Retrieve default ACL from parent, if any. 1159 */ 1160 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1161 switch (error) { 1162 case 0: 1163 /* 1164 * Retrieved a default ACL, so merge mode and ACL if 1165 * necessary. If the ACL is empty, fall through to 1166 * the "not defined or available" case. 1167 */ 1168 if (acl->acl_cnt != 0) { 1169 dmode = acl_posix1e_newfilemode(dmode, acl); 1170 ip->i_mode = dmode; 1171 *dacl = *acl; 1172 ext2_sync_acl_from_inode(ip, acl); 1173 break; 1174 } 1175 /* FALLTHROUGH */ 1176 1177 case EOPNOTSUPP: 1178 /* 1179 * Just use the mode as-is. 1180 */ 1181 ip->i_mode = dmode; 1182 error = 0; 1183 goto out; 1184 1185 default: 1186 goto out; 1187 } 1188 1189 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1190 if (error == 0) 1191 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1192 switch (error) { 1193 case 0: 1194 break; 1195 1196 case EOPNOTSUPP: 1197 /* 1198 * XXX: This should not happen, as EOPNOTSUPP above 1199 * was supposed to free acl. 1200 */ 1201 #ifdef DEBUG 1202 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1203 #endif /* DEBUG */ 1204 break; 1205 1206 default: 1207 goto out; 1208 } 1209 1210 out: 1211 acl_free(acl); 1212 acl_free(dacl); 1213 1214 return (error); 1215 } 1216 1217 static int 1218 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1219 mode_t mode, struct ucred *cred, struct thread *td) 1220 { 1221 int error; 1222 struct inode *ip = VTOI(tvp); 1223 struct acl *acl; 1224 1225 acl = acl_alloc(M_WAITOK); 1226 1227 /* 1228 * Retrieve default ACL for parent, if any. 1229 */ 1230 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1231 switch (error) { 1232 case 0: 1233 /* 1234 * Retrieved a default ACL, so merge mode and ACL if 1235 * necessary. 1236 */ 1237 if (acl->acl_cnt != 0) { 1238 /* 1239 * Two possible ways for default ACL to not 1240 * be present. First, the EA can be 1241 * undefined, or second, the default ACL can 1242 * be blank. If it's blank, fall through to 1243 * the it's not defined case. 1244 */ 1245 mode = acl_posix1e_newfilemode(mode, acl); 1246 ip->i_mode = mode; 1247 ext2_sync_acl_from_inode(ip, acl); 1248 break; 1249 } 1250 /* FALLTHROUGH */ 1251 1252 case EOPNOTSUPP: 1253 /* 1254 * Just use the mode as-is. 1255 */ 1256 ip->i_mode = mode; 1257 error = 0; 1258 goto out; 1259 1260 default: 1261 goto out; 1262 } 1263 1264 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1265 switch (error) { 1266 case 0: 1267 break; 1268 1269 case EOPNOTSUPP: 1270 /* 1271 * XXX: This should not happen, as EOPNOTSUPP above was 1272 * supposed to free acl. 1273 */ 1274 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1275 "but no VOP_SETACL()\n"); 1276 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1277 "but no VOP_SETACL()"); */ 1278 break; 1279 1280 default: 1281 goto out; 1282 } 1283 1284 out: 1285 acl_free(acl); 1286 1287 return (error); 1288 } 1289 1290 #endif /* UFS_ACL */ 1291 1292 /* 1293 * Mkdir system call 1294 */ 1295 static int 1296 ext2_mkdir(struct vop_mkdir_args *ap) 1297 { 1298 struct m_ext2fs *fs; 1299 struct vnode *dvp = ap->a_dvp; 1300 struct vattr *vap = ap->a_vap; 1301 struct componentname *cnp = ap->a_cnp; 1302 struct inode *ip, *dp; 1303 struct vnode *tvp; 1304 struct dirtemplate dirtemplate, *dtp; 1305 char *buf = NULL; 1306 int error, dmode; 1307 1308 #ifdef INVARIANTS 1309 if ((cnp->cn_flags & HASBUF) == 0) 1310 panic("ext2_mkdir: no name"); 1311 #endif 1312 dp = VTOI(dvp); 1313 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1314 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1315 error = EMLINK; 1316 goto out; 1317 } 1318 dmode = vap->va_mode & 0777; 1319 dmode |= IFDIR; 1320 /* 1321 * Must simulate part of ext2_makeinode here to acquire the inode, 1322 * but not have it entered in the parent directory. The entry is 1323 * made later after writing "." and ".." entries. 1324 */ 1325 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1326 if (error) 1327 goto out; 1328 ip = VTOI(tvp); 1329 fs = ip->i_e2fs; 1330 ip->i_gid = dp->i_gid; 1331 #ifdef SUIDDIR 1332 { 1333 /* 1334 * if we are hacking owners here, (only do this where told to) 1335 * and we are not giving it TOO root, (would subvert quotas) 1336 * then go ahead and give it to the other user. 1337 * The new directory also inherits the SUID bit. 1338 * If user's UID and dir UID are the same, 1339 * 'give it away' so that the SUID is still forced on. 1340 */ 1341 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1342 (dp->i_mode & ISUID) && dp->i_uid) { 1343 dmode |= ISUID; 1344 ip->i_uid = dp->i_uid; 1345 } else { 1346 ip->i_uid = cnp->cn_cred->cr_uid; 1347 } 1348 } 1349 #else 1350 ip->i_uid = cnp->cn_cred->cr_uid; 1351 #endif 1352 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1353 ip->i_mode = dmode; 1354 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1355 ip->i_nlink = 2; 1356 if (cnp->cn_flags & ISWHITEOUT) 1357 ip->i_flags |= UF_OPAQUE; 1358 error = ext2_update(tvp, 1); 1359 1360 /* 1361 * Bump link count in parent directory 1362 * to reflect work done below. Should 1363 * be done before reference is created 1364 * so reparation is possible if we crash. 1365 */ 1366 ext2_inc_nlink(dp); 1367 dp->i_flag |= IN_CHANGE; 1368 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1369 if (error) 1370 goto bad; 1371 1372 /* Initialize directory with "." and ".." from static template. */ 1373 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1374 EXT2F_INCOMPAT_FTYPE)) 1375 dtp = &mastertemplate; 1376 else 1377 dtp = &omastertemplate; 1378 dirtemplate = *dtp; 1379 dirtemplate.dot_ino = htole32(ip->i_number); 1380 dirtemplate.dotdot_ino = htole32(dp->i_number); 1381 /* 1382 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1383 * just redefine it - for this function only 1384 */ 1385 #undef DIRBLKSIZ 1386 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1387 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12); 1388 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1389 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1390 dirtemplate.dotdot_reclen = 1391 htole16(le16toh(dirtemplate.dotdot_reclen) - 1392 sizeof(struct ext2fs_direct_tail)); 1393 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1394 } 1395 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1396 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1397 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1398 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1399 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1400 NULL, NULL); 1401 if (error) { 1402 ext2_dec_nlink(dp); 1403 dp->i_flag |= IN_CHANGE; 1404 goto bad; 1405 } 1406 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1407 /* XXX should grow with balloc() */ 1408 panic("ext2_mkdir: blksize"); 1409 else { 1410 ip->i_size = DIRBLKSIZ; 1411 ip->i_flag |= IN_CHANGE; 1412 } 1413 1414 #ifdef UFS_ACL 1415 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1416 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1417 cnp->cn_cred, cnp->cn_thread); 1418 if (error) 1419 goto bad; 1420 } 1421 1422 #endif /* UFS_ACL */ 1423 1424 /* Directory set up, now install its entry in the parent directory. */ 1425 error = ext2_direnter(ip, dvp, cnp); 1426 if (error) { 1427 ext2_dec_nlink(dp); 1428 dp->i_flag |= IN_CHANGE; 1429 } 1430 bad: 1431 /* 1432 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1433 * for us because we set the link count to 0. 1434 */ 1435 if (error) { 1436 ip->i_nlink = 0; 1437 ip->i_flag |= IN_CHANGE; 1438 vput(tvp); 1439 } else 1440 *ap->a_vpp = tvp; 1441 out: 1442 free(buf, M_TEMP); 1443 return (error); 1444 #undef DIRBLKSIZ 1445 #define DIRBLKSIZ DEV_BSIZE 1446 } 1447 1448 /* 1449 * Rmdir system call. 1450 */ 1451 static int 1452 ext2_rmdir(struct vop_rmdir_args *ap) 1453 { 1454 struct vnode *vp = ap->a_vp; 1455 struct vnode *dvp = ap->a_dvp; 1456 struct componentname *cnp = ap->a_cnp; 1457 struct inode *ip, *dp; 1458 int error; 1459 1460 ip = VTOI(vp); 1461 dp = VTOI(dvp); 1462 1463 /* 1464 * Verify the directory is empty (and valid). 1465 * (Rmdir ".." won't be valid since 1466 * ".." will contain a reference to 1467 * the current directory and thus be 1468 * non-empty.) 1469 */ 1470 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1471 error = ENOTEMPTY; 1472 goto out; 1473 } 1474 if ((dp->i_flags & APPEND) 1475 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1476 error = EPERM; 1477 goto out; 1478 } 1479 /* 1480 * Delete reference to directory before purging 1481 * inode. If we crash in between, the directory 1482 * will be reattached to lost+found, 1483 */ 1484 error = ext2_dirremove(dvp, cnp); 1485 if (error) 1486 goto out; 1487 ext2_dec_nlink(dp); 1488 dp->i_flag |= IN_CHANGE; 1489 cache_purge(dvp); 1490 VOP_UNLOCK(dvp); 1491 /* 1492 * Truncate inode. The only stuff left 1493 * in the directory is "." and "..". 1494 */ 1495 ip->i_nlink = 0; 1496 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1497 cnp->cn_thread); 1498 cache_purge(ITOV(ip)); 1499 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1500 VOP_UNLOCK(vp); 1501 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1502 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1503 } 1504 out: 1505 return (error); 1506 } 1507 1508 /* 1509 * symlink -- make a symbolic link 1510 */ 1511 static int 1512 ext2_symlink(struct vop_symlink_args *ap) 1513 { 1514 struct vnode *vp, **vpp = ap->a_vpp; 1515 struct inode *ip; 1516 int len, error; 1517 1518 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1519 vpp, ap->a_cnp); 1520 if (error) 1521 return (error); 1522 vp = *vpp; 1523 len = strlen(ap->a_target); 1524 if (len < vp->v_mount->mnt_maxsymlinklen) { 1525 ip = VTOI(vp); 1526 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1527 ip->i_size = len; 1528 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1529 } else 1530 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1531 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1532 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1533 if (error) 1534 vput(vp); 1535 return (error); 1536 } 1537 1538 /* 1539 * Return target name of a symbolic link 1540 */ 1541 static int 1542 ext2_readlink(struct vop_readlink_args *ap) 1543 { 1544 struct vnode *vp = ap->a_vp; 1545 struct inode *ip = VTOI(vp); 1546 int isize; 1547 1548 isize = ip->i_size; 1549 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1550 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1551 return (0); 1552 } 1553 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1554 } 1555 1556 /* 1557 * Calculate the logical to physical mapping if not done already, 1558 * then call the device strategy routine. 1559 * 1560 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1561 * deadlock on memory. See ext2_bmap() for details. 1562 */ 1563 static int 1564 ext2_strategy(struct vop_strategy_args *ap) 1565 { 1566 struct buf *bp = ap->a_bp; 1567 struct vnode *vp = ap->a_vp; 1568 struct bufobj *bo; 1569 daddr_t blkno; 1570 int error; 1571 1572 if (vp->v_type == VBLK || vp->v_type == VCHR) 1573 panic("ext2_strategy: spec"); 1574 if (bp->b_blkno == bp->b_lblkno) { 1575 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1576 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1577 else 1578 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1579 1580 bp->b_blkno = blkno; 1581 if (error) { 1582 bp->b_error = error; 1583 bp->b_ioflags |= BIO_ERROR; 1584 bufdone(bp); 1585 return (0); 1586 } 1587 if ((long)bp->b_blkno == -1) 1588 vfs_bio_clrbuf(bp); 1589 } 1590 if ((long)bp->b_blkno == -1) { 1591 bufdone(bp); 1592 return (0); 1593 } 1594 bp->b_iooffset = dbtob(bp->b_blkno); 1595 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1596 BO_STRATEGY(bo, bp); 1597 return (0); 1598 } 1599 1600 /* 1601 * Print out the contents of an inode. 1602 */ 1603 static int 1604 ext2_print(struct vop_print_args *ap) 1605 { 1606 struct vnode *vp = ap->a_vp; 1607 struct inode *ip = VTOI(vp); 1608 1609 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1610 if (vp->v_type == VFIFO) 1611 fifo_printinfo(vp); 1612 printf("\n"); 1613 return (0); 1614 } 1615 1616 /* 1617 * Close wrapper for fifos. 1618 * 1619 * Update the times on the inode then do device close. 1620 */ 1621 static int 1622 ext2fifo_close(struct vop_close_args *ap) 1623 { 1624 struct vnode *vp = ap->a_vp; 1625 1626 VI_LOCK(vp); 1627 if (vp->v_usecount > 1) 1628 ext2_itimes_locked(vp); 1629 VI_UNLOCK(vp); 1630 return (fifo_specops.vop_close(ap)); 1631 } 1632 1633 /* 1634 * Kqfilter wrapper for fifos. 1635 * 1636 * Fall through to ext2 kqfilter routines if needed 1637 */ 1638 static int 1639 ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1640 { 1641 int error; 1642 1643 error = fifo_specops.vop_kqfilter(ap); 1644 if (error) 1645 error = vfs_kqfilter(ap); 1646 return (error); 1647 } 1648 1649 /* 1650 * Return POSIX pathconf information applicable to ext2 filesystems. 1651 */ 1652 static int 1653 ext2_pathconf(struct vop_pathconf_args *ap) 1654 { 1655 int error = 0; 1656 1657 switch (ap->a_name) { 1658 case _PC_LINK_MAX: 1659 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1660 EXT2F_ROCOMPAT_DIR_NLINK)) 1661 *ap->a_retval = INT_MAX; 1662 else 1663 *ap->a_retval = EXT4_LINK_MAX; 1664 break; 1665 case _PC_NAME_MAX: 1666 *ap->a_retval = NAME_MAX; 1667 break; 1668 case _PC_PIPE_BUF: 1669 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1670 *ap->a_retval = PIPE_BUF; 1671 else 1672 error = EINVAL; 1673 break; 1674 case _PC_CHOWN_RESTRICTED: 1675 *ap->a_retval = 1; 1676 break; 1677 case _PC_NO_TRUNC: 1678 *ap->a_retval = 1; 1679 break; 1680 1681 #ifdef UFS_ACL 1682 case _PC_ACL_EXTENDED: 1683 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1684 *ap->a_retval = 1; 1685 else 1686 *ap->a_retval = 0; 1687 break; 1688 case _PC_ACL_PATH_MAX: 1689 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1690 *ap->a_retval = ACL_MAX_ENTRIES; 1691 else 1692 *ap->a_retval = 3; 1693 break; 1694 #endif /* UFS_ACL */ 1695 1696 case _PC_MIN_HOLE_SIZE: 1697 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1698 break; 1699 case _PC_PRIO_IO: 1700 *ap->a_retval = 0; 1701 break; 1702 case _PC_SYNC_IO: 1703 *ap->a_retval = 0; 1704 break; 1705 case _PC_ALLOC_SIZE_MIN: 1706 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1707 break; 1708 case _PC_FILESIZEBITS: 1709 *ap->a_retval = 64; 1710 break; 1711 case _PC_REC_INCR_XFER_SIZE: 1712 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1713 break; 1714 case _PC_REC_MAX_XFER_SIZE: 1715 *ap->a_retval = -1; /* means ``unlimited'' */ 1716 break; 1717 case _PC_REC_MIN_XFER_SIZE: 1718 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1719 break; 1720 case _PC_REC_XFER_ALIGN: 1721 *ap->a_retval = PAGE_SIZE; 1722 break; 1723 case _PC_SYMLINK_MAX: 1724 *ap->a_retval = MAXPATHLEN; 1725 break; 1726 1727 default: 1728 error = vop_stdpathconf(ap); 1729 break; 1730 } 1731 return (error); 1732 } 1733 1734 /* 1735 * Vnode operation to remove a named attribute. 1736 */ 1737 static int 1738 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1739 { 1740 struct inode *ip; 1741 struct m_ext2fs *fs; 1742 int error; 1743 1744 ip = VTOI(ap->a_vp); 1745 fs = ip->i_e2fs; 1746 1747 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1748 return (EOPNOTSUPP); 1749 1750 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1751 return (EOPNOTSUPP); 1752 1753 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1754 ap->a_cred, ap->a_td, VWRITE); 1755 if (error) 1756 return (error); 1757 1758 error = ENOATTR; 1759 1760 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1761 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1762 if (error != ENOATTR) 1763 return (error); 1764 } 1765 1766 if (ip->i_facl) 1767 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1768 1769 return (error); 1770 } 1771 1772 /* 1773 * Vnode operation to retrieve a named extended attribute. 1774 */ 1775 static int 1776 ext2_getextattr(struct vop_getextattr_args *ap) 1777 { 1778 struct inode *ip; 1779 struct m_ext2fs *fs; 1780 int error; 1781 1782 ip = VTOI(ap->a_vp); 1783 fs = ip->i_e2fs; 1784 1785 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1786 return (EOPNOTSUPP); 1787 1788 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1789 return (EOPNOTSUPP); 1790 1791 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1792 ap->a_cred, ap->a_td, VREAD); 1793 if (error) 1794 return (error); 1795 1796 if (ap->a_size != NULL) 1797 *ap->a_size = 0; 1798 1799 error = ENOATTR; 1800 1801 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1802 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1803 ap->a_name, ap->a_uio, ap->a_size); 1804 if (error != ENOATTR) 1805 return (error); 1806 } 1807 1808 if (ip->i_facl) 1809 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1810 ap->a_name, ap->a_uio, ap->a_size); 1811 1812 return (error); 1813 } 1814 1815 /* 1816 * Vnode operation to retrieve extended attributes on a vnode. 1817 */ 1818 static int 1819 ext2_listextattr(struct vop_listextattr_args *ap) 1820 { 1821 struct inode *ip; 1822 struct m_ext2fs *fs; 1823 int error; 1824 1825 ip = VTOI(ap->a_vp); 1826 fs = ip->i_e2fs; 1827 1828 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1829 return (EOPNOTSUPP); 1830 1831 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1832 return (EOPNOTSUPP); 1833 1834 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1835 ap->a_cred, ap->a_td, VREAD); 1836 if (error) 1837 return (error); 1838 1839 if (ap->a_size != NULL) 1840 *ap->a_size = 0; 1841 1842 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1843 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1844 ap->a_uio, ap->a_size); 1845 if (error) 1846 return (error); 1847 } 1848 1849 if (ip->i_facl) 1850 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1851 ap->a_uio, ap->a_size); 1852 1853 return (error); 1854 } 1855 1856 /* 1857 * Vnode operation to set a named attribute. 1858 */ 1859 static int 1860 ext2_setextattr(struct vop_setextattr_args *ap) 1861 { 1862 struct inode *ip; 1863 struct m_ext2fs *fs; 1864 int error; 1865 1866 ip = VTOI(ap->a_vp); 1867 fs = ip->i_e2fs; 1868 1869 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1870 return (EOPNOTSUPP); 1871 1872 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1873 return (EOPNOTSUPP); 1874 1875 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1876 ap->a_cred, ap->a_td, VWRITE); 1877 if (error) 1878 return (error); 1879 1880 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1881 if (error) 1882 return (error); 1883 1884 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1885 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1886 ap->a_name, ap->a_uio); 1887 if (error != ENOSPC) 1888 return (error); 1889 } 1890 1891 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1892 ap->a_name, ap->a_uio); 1893 1894 return (error); 1895 } 1896 1897 /* 1898 * Vnode pointer to File handle 1899 */ 1900 /* ARGSUSED */ 1901 static int 1902 ext2_vptofh(struct vop_vptofh_args *ap) 1903 { 1904 struct inode *ip; 1905 struct ufid *ufhp; 1906 1907 ip = VTOI(ap->a_vp); 1908 ufhp = (struct ufid *)ap->a_fhp; 1909 ufhp->ufid_len = sizeof(struct ufid); 1910 ufhp->ufid_ino = ip->i_number; 1911 ufhp->ufid_gen = ip->i_gen; 1912 return (0); 1913 } 1914 1915 /* 1916 * Initialize the vnode associated with a new inode, handle aliased 1917 * vnodes. 1918 */ 1919 int 1920 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1921 { 1922 struct inode *ip; 1923 struct vnode *vp; 1924 1925 vp = *vpp; 1926 ip = VTOI(vp); 1927 vp->v_type = IFTOVT(ip->i_mode); 1928 /* 1929 * Only unallocated inodes should be of type VNON. 1930 */ 1931 if (ip->i_mode != 0 && vp->v_type == VNON) 1932 return (EINVAL); 1933 if (vp->v_type == VFIFO) 1934 vp->v_op = fifoops; 1935 1936 if (ip->i_number == EXT2_ROOTINO) 1937 vp->v_vflag |= VV_ROOT; 1938 ip->i_modrev = init_va_filerev(); 1939 *vpp = vp; 1940 return (0); 1941 } 1942 1943 /* 1944 * Allocate a new inode. 1945 */ 1946 static int 1947 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1948 struct componentname *cnp) 1949 { 1950 struct inode *ip, *pdir; 1951 struct vnode *tvp; 1952 int error; 1953 1954 pdir = VTOI(dvp); 1955 #ifdef INVARIANTS 1956 if ((cnp->cn_flags & HASBUF) == 0) 1957 panic("ext2_makeinode: no name"); 1958 #endif 1959 *vpp = NULL; 1960 if ((mode & IFMT) == 0) 1961 mode |= IFREG; 1962 1963 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1964 if (error) { 1965 return (error); 1966 } 1967 ip = VTOI(tvp); 1968 ip->i_gid = pdir->i_gid; 1969 #ifdef SUIDDIR 1970 { 1971 /* 1972 * if we are 1973 * not the owner of the directory, 1974 * and we are hacking owners here, (only do this where told to) 1975 * and we are not giving it TOO root, (would subvert quotas) 1976 * then go ahead and give it to the other user. 1977 * Note that this drops off the execute bits for security. 1978 */ 1979 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1980 (pdir->i_mode & ISUID) && 1981 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1982 ip->i_uid = pdir->i_uid; 1983 mode &= ~07111; 1984 } else { 1985 ip->i_uid = cnp->cn_cred->cr_uid; 1986 } 1987 } 1988 #else 1989 ip->i_uid = cnp->cn_cred->cr_uid; 1990 #endif 1991 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1992 ip->i_mode = mode; 1993 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1994 ip->i_nlink = 1; 1995 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1996 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 1997 ip->i_mode &= ~ISGID; 1998 } 1999 2000 if (cnp->cn_flags & ISWHITEOUT) 2001 ip->i_flags |= UF_OPAQUE; 2002 2003 /* 2004 * Make sure inode goes to disk before directory entry. 2005 */ 2006 error = ext2_update(tvp, !DOINGASYNC(tvp)); 2007 if (error) 2008 goto bad; 2009 2010 #ifdef UFS_ACL 2011 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 2012 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 2013 cnp->cn_cred, cnp->cn_thread); 2014 if (error) 2015 goto bad; 2016 } 2017 #endif /* UFS_ACL */ 2018 2019 error = ext2_direnter(ip, dvp, cnp); 2020 if (error) 2021 goto bad; 2022 2023 *vpp = tvp; 2024 return (0); 2025 2026 bad: 2027 /* 2028 * Write error occurred trying to update the inode 2029 * or the directory so must deallocate the inode. 2030 */ 2031 ip->i_nlink = 0; 2032 ip->i_flag |= IN_CHANGE; 2033 vput(tvp); 2034 return (error); 2035 } 2036 2037 /* 2038 * Vnode op for reading. 2039 */ 2040 static int 2041 ext2_read(struct vop_read_args *ap) 2042 { 2043 struct vnode *vp; 2044 struct inode *ip; 2045 struct uio *uio; 2046 struct m_ext2fs *fs; 2047 struct buf *bp; 2048 daddr_t lbn, nextlbn; 2049 off_t bytesinfile; 2050 long size, xfersize, blkoffset; 2051 int error, orig_resid, seqcount; 2052 int ioflag; 2053 2054 vp = ap->a_vp; 2055 uio = ap->a_uio; 2056 ioflag = ap->a_ioflag; 2057 2058 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2059 ip = VTOI(vp); 2060 2061 #ifdef INVARIANTS 2062 if (uio->uio_rw != UIO_READ) 2063 panic("%s: mode", "ext2_read"); 2064 2065 if (vp->v_type == VLNK) { 2066 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 2067 panic("%s: short symlink", "ext2_read"); 2068 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2069 panic("%s: type %d", "ext2_read", vp->v_type); 2070 #endif 2071 orig_resid = uio->uio_resid; 2072 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2073 if (orig_resid == 0) 2074 return (0); 2075 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2076 fs = ip->i_e2fs; 2077 if (uio->uio_offset < ip->i_size && 2078 uio->uio_offset >= fs->e2fs_maxfilesize) 2079 return (EOVERFLOW); 2080 2081 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2082 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2083 break; 2084 lbn = lblkno(fs, uio->uio_offset); 2085 nextlbn = lbn + 1; 2086 size = blksize(fs, ip, lbn); 2087 blkoffset = blkoff(fs, uio->uio_offset); 2088 2089 xfersize = fs->e2fs_fsize - blkoffset; 2090 if (uio->uio_resid < xfersize) 2091 xfersize = uio->uio_resid; 2092 if (bytesinfile < xfersize) 2093 xfersize = bytesinfile; 2094 2095 if (lblktosize(fs, nextlbn) >= ip->i_size) 2096 error = bread(vp, lbn, size, NOCRED, &bp); 2097 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2098 error = cluster_read(vp, ip->i_size, lbn, size, 2099 NOCRED, blkoffset + uio->uio_resid, seqcount, 2100 0, &bp); 2101 } else if (seqcount > 1) { 2102 u_int nextsize = blksize(fs, ip, nextlbn); 2103 2104 error = breadn(vp, lbn, 2105 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2106 } else 2107 error = bread(vp, lbn, size, NOCRED, &bp); 2108 if (error) { 2109 brelse(bp); 2110 bp = NULL; 2111 break; 2112 } 2113 2114 /* 2115 * We should only get non-zero b_resid when an I/O error 2116 * has occurred, which should cause us to break above. 2117 * However, if the short read did not cause an error, 2118 * then we want to ensure that we do not uiomove bad 2119 * or uninitialized data. 2120 */ 2121 size -= bp->b_resid; 2122 if (size < xfersize) { 2123 if (size == 0) 2124 break; 2125 xfersize = size; 2126 } 2127 error = uiomove((char *)bp->b_data + blkoffset, 2128 (int)xfersize, uio); 2129 if (error) 2130 break; 2131 vfs_bio_brelse(bp, ioflag); 2132 } 2133 2134 /* 2135 * This can only happen in the case of an error because the loop 2136 * above resets bp to NULL on each iteration and on normal 2137 * completion has not set a new value into it. so it must have come 2138 * from a 'break' statement 2139 */ 2140 if (bp != NULL) 2141 vfs_bio_brelse(bp, ioflag); 2142 2143 if ((error == 0 || uio->uio_resid != orig_resid) && 2144 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2145 ip->i_flag |= IN_ACCESS; 2146 return (error); 2147 } 2148 2149 static int 2150 ext2_ioctl(struct vop_ioctl_args *ap) 2151 { 2152 struct vnode *vp; 2153 int error; 2154 2155 vp = ap->a_vp; 2156 switch (ap->a_command) { 2157 case FIOSEEKDATA: 2158 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) { 2159 error = vn_lock(vp, LK_SHARED); 2160 if (error == 0) { 2161 error = ext2_bmap_seekdata(vp, 2162 (off_t *)ap->a_data); 2163 VOP_UNLOCK(vp); 2164 } else 2165 error = EBADF; 2166 return (error); 2167 } 2168 case FIOSEEKHOLE: 2169 return (vn_bmap_seekhole(vp, ap->a_command, 2170 (off_t *)ap->a_data, ap->a_cred)); 2171 default: 2172 return (ENOTTY); 2173 } 2174 } 2175 2176 /* 2177 * Vnode op for writing. 2178 */ 2179 static int 2180 ext2_write(struct vop_write_args *ap) 2181 { 2182 struct vnode *vp; 2183 struct uio *uio; 2184 struct inode *ip; 2185 struct m_ext2fs *fs; 2186 struct buf *bp; 2187 daddr_t lbn; 2188 off_t osize; 2189 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2190 2191 ioflag = ap->a_ioflag; 2192 uio = ap->a_uio; 2193 vp = ap->a_vp; 2194 2195 seqcount = ioflag >> IO_SEQSHIFT; 2196 ip = VTOI(vp); 2197 2198 #ifdef INVARIANTS 2199 if (uio->uio_rw != UIO_WRITE) 2200 panic("%s: mode", "ext2_write"); 2201 #endif 2202 2203 switch (vp->v_type) { 2204 case VREG: 2205 if (ioflag & IO_APPEND) 2206 uio->uio_offset = ip->i_size; 2207 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2208 return (EPERM); 2209 /* FALLTHROUGH */ 2210 case VLNK: 2211 break; 2212 case VDIR: 2213 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2214 if ((ioflag & IO_SYNC) == 0) 2215 panic("ext2_write: nonsync dir write"); 2216 break; 2217 default: 2218 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2219 vp->v_type, (intmax_t)uio->uio_offset, 2220 (intmax_t)uio->uio_resid); 2221 } 2222 2223 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2224 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2225 fs = ip->i_e2fs; 2226 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2227 return (EFBIG); 2228 /* 2229 * Maybe this should be above the vnode op call, but so long as 2230 * file servers have no limits, I don't think it matters. 2231 */ 2232 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 2233 return (EFBIG); 2234 2235 resid = uio->uio_resid; 2236 osize = ip->i_size; 2237 if (seqcount > BA_SEQMAX) 2238 flags = BA_SEQMAX << BA_SEQSHIFT; 2239 else 2240 flags = seqcount << BA_SEQSHIFT; 2241 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2242 flags |= IO_SYNC; 2243 2244 for (error = 0; uio->uio_resid > 0;) { 2245 lbn = lblkno(fs, uio->uio_offset); 2246 blkoffset = blkoff(fs, uio->uio_offset); 2247 xfersize = fs->e2fs_fsize - blkoffset; 2248 if (uio->uio_resid < xfersize) 2249 xfersize = uio->uio_resid; 2250 if (uio->uio_offset + xfersize > ip->i_size) 2251 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2252 2253 /* 2254 * We must perform a read-before-write if the transfer size 2255 * does not cover the entire buffer. 2256 */ 2257 if (fs->e2fs_bsize > xfersize) 2258 flags |= BA_CLRBUF; 2259 else 2260 flags &= ~BA_CLRBUF; 2261 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2262 ap->a_cred, &bp, flags); 2263 if (error != 0) 2264 break; 2265 2266 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2267 bp->b_flags |= B_NOCACHE; 2268 if (uio->uio_offset + xfersize > ip->i_size) 2269 ip->i_size = uio->uio_offset + xfersize; 2270 size = blksize(fs, ip, lbn) - bp->b_resid; 2271 if (size < xfersize) 2272 xfersize = size; 2273 2274 error = 2275 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2276 /* 2277 * If the buffer is not already filled and we encounter an 2278 * error while trying to fill it, we have to clear out any 2279 * garbage data from the pages instantiated for the buffer. 2280 * If we do not, a failed uiomove() during a write can leave 2281 * the prior contents of the pages exposed to a userland mmap. 2282 * 2283 * Note that we need only clear buffers with a transfer size 2284 * equal to the block size because buffers with a shorter 2285 * transfer size were cleared above by the call to ext2_balloc() 2286 * with the BA_CLRBUF flag set. 2287 * 2288 * If the source region for uiomove identically mmaps the 2289 * buffer, uiomove() performed the NOP copy, and the buffer 2290 * content remains valid because the page fault handler 2291 * validated the pages. 2292 */ 2293 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2294 fs->e2fs_bsize == xfersize) 2295 vfs_bio_clrbuf(bp); 2296 2297 vfs_bio_set_flags(bp, ioflag); 2298 2299 /* 2300 * If IO_SYNC each buffer is written synchronously. Otherwise 2301 * if we have a severe page deficiency write the buffer 2302 * asynchronously. Otherwise try to cluster, and if that 2303 * doesn't do it then either do an async write (if O_DIRECT), 2304 * or a delayed write (if not). 2305 */ 2306 if (ioflag & IO_SYNC) { 2307 (void)bwrite(bp); 2308 } else if (vm_page_count_severe() || 2309 buf_dirty_count_severe() || 2310 (ioflag & IO_ASYNC)) { 2311 bp->b_flags |= B_CLUSTEROK; 2312 bawrite(bp); 2313 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2314 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2315 bp->b_flags |= B_CLUSTEROK; 2316 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2317 } else { 2318 bawrite(bp); 2319 } 2320 } else if (ioflag & IO_DIRECT) { 2321 bp->b_flags |= B_CLUSTEROK; 2322 bawrite(bp); 2323 } else { 2324 bp->b_flags |= B_CLUSTEROK; 2325 bdwrite(bp); 2326 } 2327 if (error || xfersize == 0) 2328 break; 2329 } 2330 /* 2331 * If we successfully wrote any data, and we are not the superuser 2332 * we clear the setuid and setgid bits as a precaution against 2333 * tampering. 2334 */ 2335 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2336 ap->a_cred) { 2337 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2338 ip->i_mode &= ~(ISUID | ISGID); 2339 } 2340 if (error) { 2341 if (ioflag & IO_UNIT) { 2342 (void)ext2_truncate(vp, osize, 2343 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2344 uio->uio_offset -= resid - uio->uio_resid; 2345 uio->uio_resid = resid; 2346 } 2347 } 2348 if (uio->uio_resid != resid) { 2349 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2350 if (ioflag & IO_SYNC) 2351 error = ext2_update(vp, 1); 2352 } 2353 return (error); 2354 } 2355