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 /* 326 * Disallow write attempts on read-only file systems; 327 * unless the file is a socket, fifo, or a block or 328 * character device resident on the file system. 329 */ 330 if (accmode & VWRITE) { 331 switch (vp->v_type) { 332 case VDIR: 333 case VLNK: 334 case VREG: 335 if (vp->v_mount->mnt_flag & MNT_RDONLY) 336 return (EROFS); 337 break; 338 default: 339 break; 340 } 341 } 342 343 /* If immutable bit set, nobody gets to write it. */ 344 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 345 return (EPERM); 346 347 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 348 ap->a_accmode, ap->a_cred); 349 return (error); 350 } 351 352 static int 353 ext2_getattr(struct vop_getattr_args *ap) 354 { 355 struct vnode *vp = ap->a_vp; 356 struct inode *ip = VTOI(vp); 357 struct vattr *vap = ap->a_vap; 358 359 ext2_itimes(vp); 360 /* 361 * Copy from inode table 362 */ 363 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 364 vap->va_fileid = ip->i_number; 365 vap->va_mode = ip->i_mode & ~IFMT; 366 vap->va_nlink = ip->i_nlink; 367 vap->va_uid = ip->i_uid; 368 vap->va_gid = ip->i_gid; 369 vap->va_rdev = ip->i_rdev; 370 vap->va_size = ip->i_size; 371 vap->va_atime.tv_sec = ip->i_atime; 372 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 373 vap->va_mtime.tv_sec = ip->i_mtime; 374 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 375 vap->va_ctime.tv_sec = ip->i_ctime; 376 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 377 if (E2DI_HAS_XTIME(ip)) { 378 vap->va_birthtime.tv_sec = ip->i_birthtime; 379 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 380 } 381 vap->va_flags = ip->i_flags; 382 vap->va_gen = ip->i_gen; 383 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 384 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 385 vap->va_type = IFTOVT(ip->i_mode); 386 vap->va_filerev = ip->i_modrev; 387 return (0); 388 } 389 390 /* 391 * Set attribute vnode op. called from several syscalls 392 */ 393 static int 394 ext2_setattr(struct vop_setattr_args *ap) 395 { 396 struct vattr *vap = ap->a_vap; 397 struct vnode *vp = ap->a_vp; 398 struct inode *ip = VTOI(vp); 399 struct ucred *cred = ap->a_cred; 400 struct thread *td = curthread; 401 int error; 402 403 /* 404 * Check for unsettable attributes. 405 */ 406 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 407 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 408 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 409 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 410 return (EINVAL); 411 } 412 if (vap->va_flags != VNOVAL) { 413 /* Disallow flags not supported by ext2fs. */ 414 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 415 return (EOPNOTSUPP); 416 417 if (vp->v_mount->mnt_flag & MNT_RDONLY) 418 return (EROFS); 419 /* 420 * Callers may only modify the file flags on objects they 421 * have VADMIN rights for. 422 */ 423 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 424 return (error); 425 /* 426 * Unprivileged processes and privileged processes in 427 * jail() are not permitted to unset system flags, or 428 * modify flags if any system flags are set. 429 * Privileged non-jail processes may not modify system flags 430 * if securelevel > 0 and any existing system flags are set. 431 */ 432 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 433 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 434 error = securelevel_gt(cred, 0); 435 if (error) 436 return (error); 437 } 438 } else { 439 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 440 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 441 return (EPERM); 442 } 443 ip->i_flags = vap->va_flags; 444 ip->i_flag |= IN_CHANGE; 445 if (ip->i_flags & (IMMUTABLE | APPEND)) 446 return (0); 447 } 448 if (ip->i_flags & (IMMUTABLE | APPEND)) 449 return (EPERM); 450 /* 451 * Go through the fields and update iff not VNOVAL. 452 */ 453 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 454 if (vp->v_mount->mnt_flag & MNT_RDONLY) 455 return (EROFS); 456 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 457 td)) != 0) 458 return (error); 459 } 460 if (vap->va_size != VNOVAL) { 461 /* 462 * Disallow write attempts on read-only file systems; 463 * unless the file is a socket, fifo, or a block or 464 * character device resident on the file system. 465 */ 466 switch (vp->v_type) { 467 case VDIR: 468 return (EISDIR); 469 case VLNK: 470 case VREG: 471 if (vp->v_mount->mnt_flag & MNT_RDONLY) 472 return (EROFS); 473 break; 474 default: 475 break; 476 } 477 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 478 return (error); 479 } 480 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 481 if (vp->v_mount->mnt_flag & MNT_RDONLY) 482 return (EROFS); 483 /* 484 * From utimes(2): 485 * If times is NULL, ... The caller must be the owner of 486 * the file, have permission to write the file, or be the 487 * super-user. 488 * If times is non-NULL, ... The caller must be the owner of 489 * the file or be the super-user. 490 */ 491 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 492 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 493 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 494 return (error); 495 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 496 if (vap->va_atime.tv_sec != VNOVAL) { 497 ip->i_flag &= ~IN_ACCESS; 498 ip->i_atime = vap->va_atime.tv_sec; 499 ip->i_atimensec = vap->va_atime.tv_nsec; 500 } 501 if (vap->va_mtime.tv_sec != VNOVAL) { 502 ip->i_flag &= ~IN_UPDATE; 503 ip->i_mtime = vap->va_mtime.tv_sec; 504 ip->i_mtimensec = vap->va_mtime.tv_nsec; 505 } 506 if (E2DI_HAS_XTIME(ip) && vap->va_birthtime.tv_sec != VNOVAL) { 507 ip->i_birthtime = vap->va_birthtime.tv_sec; 508 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 509 } 510 error = ext2_update(vp, 0); 511 if (error) 512 return (error); 513 } 514 error = 0; 515 if (vap->va_mode != (mode_t)VNOVAL) { 516 if (vp->v_mount->mnt_flag & MNT_RDONLY) 517 return (EROFS); 518 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 519 } 520 return (error); 521 } 522 523 /* 524 * Change the mode on a file. 525 * Inode must be locked before calling. 526 */ 527 static int 528 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 529 { 530 struct inode *ip = VTOI(vp); 531 int error; 532 533 /* 534 * To modify the permissions on a file, must possess VADMIN 535 * for that file. 536 */ 537 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 538 return (error); 539 /* 540 * Privileged processes may set the sticky bit on non-directories, 541 * as well as set the setgid bit on a file with a group that the 542 * process is not a member of. 543 */ 544 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 545 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 546 if (error) 547 return (EFTYPE); 548 } 549 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 550 error = priv_check_cred(cred, PRIV_VFS_SETGID); 551 if (error) 552 return (error); 553 } 554 ip->i_mode &= ~ALLPERMS; 555 ip->i_mode |= (mode & ALLPERMS); 556 ip->i_flag |= IN_CHANGE; 557 return (0); 558 } 559 560 /* 561 * Perform chown operation on inode ip; 562 * inode must be locked prior to call. 563 */ 564 static int 565 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 566 struct thread *td) 567 { 568 struct inode *ip = VTOI(vp); 569 uid_t ouid; 570 gid_t ogid; 571 int error = 0; 572 573 if (uid == (uid_t)VNOVAL) 574 uid = ip->i_uid; 575 if (gid == (gid_t)VNOVAL) 576 gid = ip->i_gid; 577 /* 578 * To modify the ownership of a file, must possess VADMIN 579 * for that file. 580 */ 581 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 582 return (error); 583 /* 584 * To change the owner of a file, or change the group of a file 585 * to a group of which we are not a member, the caller must 586 * have privilege. 587 */ 588 if (uid != ip->i_uid || (gid != ip->i_gid && 589 !groupmember(gid, cred))) { 590 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 591 if (error) 592 return (error); 593 } 594 ogid = ip->i_gid; 595 ouid = ip->i_uid; 596 ip->i_gid = gid; 597 ip->i_uid = uid; 598 ip->i_flag |= IN_CHANGE; 599 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 600 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 601 ip->i_mode &= ~(ISUID | ISGID); 602 } 603 return (0); 604 } 605 606 /* 607 * Synch an open file. 608 */ 609 /* ARGSUSED */ 610 static int 611 ext2_fsync(struct vop_fsync_args *ap) 612 { 613 /* 614 * Flush all dirty buffers associated with a vnode. 615 */ 616 617 vop_stdfsync(ap); 618 619 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 620 } 621 622 static int 623 ext2_check_mknod_limits(dev_t dev) 624 { 625 unsigned maj = major(dev); 626 unsigned min = minor(dev); 627 628 if (maj > EXT2_MAJOR_MAX || min > EXT2_MINOR_MAX) 629 return (EINVAL); 630 631 return (0); 632 } 633 634 /* 635 * Mknod vnode call 636 */ 637 /* ARGSUSED */ 638 static int 639 ext2_mknod(struct vop_mknod_args *ap) 640 { 641 struct vattr *vap = ap->a_vap; 642 struct vnode **vpp = ap->a_vpp; 643 struct inode *ip; 644 ino_t ino; 645 int error; 646 647 if (vap->va_rdev != VNOVAL) { 648 error = ext2_check_mknod_limits(vap->va_rdev); 649 if (error) 650 return (error); 651 } 652 653 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 654 ap->a_dvp, vpp, ap->a_cnp); 655 if (error) 656 return (error); 657 ip = VTOI(*vpp); 658 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 659 if (vap->va_rdev != VNOVAL) 660 ip->i_rdev = vap->va_rdev; 661 662 /* 663 * Remove inode, then reload it through VFS_VGET so it is 664 * checked to see if it is an alias of an existing entry in 665 * the inode cache. XXX I don't believe this is necessary now. 666 */ 667 (*vpp)->v_type = VNON; 668 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 669 vgone(*vpp); 670 vput(*vpp); 671 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 672 if (error) { 673 *vpp = NULL; 674 return (error); 675 } 676 return (0); 677 } 678 679 static int 680 ext2_remove(struct vop_remove_args *ap) 681 { 682 struct inode *ip; 683 struct vnode *vp = ap->a_vp; 684 struct vnode *dvp = ap->a_dvp; 685 int error; 686 687 ip = VTOI(vp); 688 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 689 (VTOI(dvp)->i_flags & APPEND)) { 690 error = EPERM; 691 goto out; 692 } 693 error = ext2_dirremove(dvp, ap->a_cnp); 694 if (error == 0) { 695 ip->i_nlink--; 696 ip->i_flag |= IN_CHANGE; 697 } 698 out: 699 return (error); 700 } 701 702 /* 703 * link vnode call 704 */ 705 static int 706 ext2_link(struct vop_link_args *ap) 707 { 708 struct vnode *vp = ap->a_vp; 709 struct vnode *tdvp = ap->a_tdvp; 710 struct componentname *cnp = ap->a_cnp; 711 struct inode *ip; 712 int error; 713 714 #ifdef INVARIANTS 715 if ((cnp->cn_flags & HASBUF) == 0) 716 panic("ext2_link: no name"); 717 #endif 718 ip = VTOI(vp); 719 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 720 error = EMLINK; 721 goto out; 722 } 723 if (ip->i_flags & (IMMUTABLE | APPEND)) { 724 error = EPERM; 725 goto out; 726 } 727 ip->i_nlink++; 728 ip->i_flag |= IN_CHANGE; 729 error = ext2_update(vp, !DOINGASYNC(vp)); 730 if (!error) 731 error = ext2_direnter(ip, tdvp, cnp); 732 if (error) { 733 ip->i_nlink--; 734 ip->i_flag |= IN_CHANGE; 735 } 736 out: 737 return (error); 738 } 739 740 static int 741 ext2_inc_nlink(struct inode *ip) 742 { 743 744 ip->i_nlink++; 745 746 if (S_ISDIR(ip->i_mode) && 747 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 748 ip->i_nlink > 1) { 749 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 750 ip->i_nlink = 1; 751 } else if (ip->i_nlink > EXT4_LINK_MAX) { 752 ip->i_nlink--; 753 return (EMLINK); 754 } 755 756 return (0); 757 } 758 759 static void 760 ext2_dec_nlink(struct inode *ip) 761 { 762 763 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 764 ip->i_nlink--; 765 } 766 767 /* 768 * Rename system call. 769 * rename("foo", "bar"); 770 * is essentially 771 * unlink("bar"); 772 * link("foo", "bar"); 773 * unlink("foo"); 774 * but ``atomically''. Can't do full commit without saving state in the 775 * inode on disk which isn't feasible at this time. Best we can do is 776 * always guarantee the target exists. 777 * 778 * Basic algorithm is: 779 * 780 * 1) Bump link count on source while we're linking it to the 781 * target. This also ensure the inode won't be deleted out 782 * from underneath us while we work (it may be truncated by 783 * a concurrent `trunc' or `open' for creation). 784 * 2) Link source to destination. If destination already exists, 785 * delete it first. 786 * 3) Unlink source reference to inode if still around. If a 787 * directory was moved and the parent of the destination 788 * is different from the source, patch the ".." entry in the 789 * directory. 790 */ 791 static int 792 ext2_rename(struct vop_rename_args *ap) 793 { 794 struct vnode *tvp = ap->a_tvp; 795 struct vnode *tdvp = ap->a_tdvp; 796 struct vnode *fvp = ap->a_fvp; 797 struct vnode *fdvp = ap->a_fdvp; 798 struct componentname *tcnp = ap->a_tcnp; 799 struct componentname *fcnp = ap->a_fcnp; 800 struct inode *ip, *xp, *dp; 801 struct dirtemplate *dirbuf; 802 int doingdirectory = 0, oldparent = 0, newparent = 0; 803 int error = 0; 804 u_char namlen; 805 806 #ifdef INVARIANTS 807 if ((tcnp->cn_flags & HASBUF) == 0 || 808 (fcnp->cn_flags & HASBUF) == 0) 809 panic("ext2_rename: no name"); 810 #endif 811 /* 812 * Check for cross-device rename. 813 */ 814 if ((fvp->v_mount != tdvp->v_mount) || 815 (tvp && (fvp->v_mount != tvp->v_mount))) { 816 error = EXDEV; 817 abortit: 818 if (tdvp == tvp) 819 vrele(tdvp); 820 else 821 vput(tdvp); 822 if (tvp) 823 vput(tvp); 824 vrele(fdvp); 825 vrele(fvp); 826 return (error); 827 } 828 829 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 830 (VTOI(tdvp)->i_flags & APPEND))) { 831 error = EPERM; 832 goto abortit; 833 } 834 835 /* 836 * Renaming a file to itself has no effect. The upper layers should 837 * not call us in that case. Temporarily just warn if they do. 838 */ 839 if (fvp == tvp) { 840 SDT_PROBE2(ext2fs, , vnops, trace, 1, 841 "rename: fvp == tvp (can't happen)"); 842 error = 0; 843 goto abortit; 844 } 845 846 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 847 goto abortit; 848 dp = VTOI(fdvp); 849 ip = VTOI(fvp); 850 if (ip->i_nlink >= EXT4_LINK_MAX && 851 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 852 VOP_UNLOCK(fvp); 853 error = EMLINK; 854 goto abortit; 855 } 856 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 857 || (dp->i_flags & APPEND)) { 858 VOP_UNLOCK(fvp); 859 error = EPERM; 860 goto abortit; 861 } 862 if ((ip->i_mode & IFMT) == IFDIR) { 863 /* 864 * Avoid ".", "..", and aliases of "." for obvious reasons. 865 */ 866 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 867 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 868 (ip->i_flag & IN_RENAME)) { 869 VOP_UNLOCK(fvp); 870 error = EINVAL; 871 goto abortit; 872 } 873 ip->i_flag |= IN_RENAME; 874 oldparent = dp->i_number; 875 doingdirectory++; 876 } 877 vrele(fdvp); 878 879 /* 880 * When the target exists, both the directory 881 * and target vnodes are returned locked. 882 */ 883 dp = VTOI(tdvp); 884 xp = NULL; 885 if (tvp) 886 xp = VTOI(tvp); 887 888 /* 889 * 1) Bump link count while we're moving stuff 890 * around. If we crash somewhere before 891 * completing our work, the link count 892 * may be wrong, but correctable. 893 */ 894 ext2_inc_nlink(ip); 895 ip->i_flag |= IN_CHANGE; 896 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 897 VOP_UNLOCK(fvp); 898 goto bad; 899 } 900 901 /* 902 * If ".." must be changed (ie the directory gets a new 903 * parent) then the source directory must not be in the 904 * directory hierarchy above the target, as this would 905 * orphan everything below the source directory. Also 906 * the user must have write permission in the source so 907 * as to be able to change "..". We must repeat the call 908 * to namei, as the parent directory is unlocked by the 909 * call to checkpath(). 910 */ 911 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 912 VOP_UNLOCK(fvp); 913 if (oldparent != dp->i_number) 914 newparent = dp->i_number; 915 if (doingdirectory && newparent) { 916 if (error) /* write access check above */ 917 goto bad; 918 if (xp != NULL) 919 vput(tvp); 920 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 921 if (error) 922 goto out; 923 VREF(tdvp); 924 error = relookup(tdvp, &tvp, tcnp); 925 if (error) 926 goto out; 927 vrele(tdvp); 928 dp = VTOI(tdvp); 929 xp = NULL; 930 if (tvp) 931 xp = VTOI(tvp); 932 } 933 /* 934 * 2) If target doesn't exist, link the target 935 * to the source and unlink the source. 936 * Otherwise, rewrite the target directory 937 * entry to reference the source inode and 938 * expunge the original entry's existence. 939 */ 940 if (xp == NULL) { 941 if (dp->i_devvp != ip->i_devvp) 942 panic("ext2_rename: EXDEV"); 943 /* 944 * Account for ".." in new directory. 945 * When source and destination have the same 946 * parent we don't fool with the link count. 947 */ 948 if (doingdirectory && newparent) { 949 error = ext2_inc_nlink(dp); 950 if (error) 951 goto bad; 952 953 dp->i_flag |= IN_CHANGE; 954 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 955 if (error) 956 goto bad; 957 } 958 error = ext2_direnter(ip, tdvp, tcnp); 959 if (error) { 960 if (doingdirectory && newparent) { 961 ext2_dec_nlink(dp); 962 dp->i_flag |= IN_CHANGE; 963 (void)ext2_update(tdvp, 1); 964 } 965 goto bad; 966 } 967 vput(tdvp); 968 } else { 969 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 970 panic("ext2_rename: EXDEV"); 971 /* 972 * Short circuit rename(foo, foo). 973 */ 974 if (xp->i_number == ip->i_number) 975 panic("ext2_rename: same file"); 976 /* 977 * If the parent directory is "sticky", then the user must 978 * own the parent directory, or the destination of the rename, 979 * otherwise the destination may not be changed (except by 980 * root). This implements append-only directories. 981 */ 982 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 983 tcnp->cn_cred->cr_uid != dp->i_uid && 984 xp->i_uid != tcnp->cn_cred->cr_uid) { 985 error = EPERM; 986 goto bad; 987 } 988 /* 989 * Target must be empty if a directory and have no links 990 * to it. Also, ensure source and target are compatible 991 * (both directories, or both not directories). 992 */ 993 if ((xp->i_mode & IFMT) == IFDIR) { 994 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 995 error = ENOTEMPTY; 996 goto bad; 997 } 998 if (!doingdirectory) { 999 error = ENOTDIR; 1000 goto bad; 1001 } 1002 cache_purge(tdvp); 1003 } else if (doingdirectory) { 1004 error = EISDIR; 1005 goto bad; 1006 } 1007 error = ext2_dirrewrite(dp, ip, tcnp); 1008 if (error) 1009 goto bad; 1010 /* 1011 * If the target directory is in the same 1012 * directory as the source directory, 1013 * decrement the link count on the parent 1014 * of the target directory. 1015 */ 1016 if (doingdirectory && !newparent) { 1017 ext2_dec_nlink(dp); 1018 dp->i_flag |= IN_CHANGE; 1019 } 1020 vput(tdvp); 1021 /* 1022 * Adjust the link count of the target to 1023 * reflect the dirrewrite above. If this is 1024 * a directory it is empty and there are 1025 * no links to it, so we can squash the inode and 1026 * any space associated with it. We disallowed 1027 * renaming over top of a directory with links to 1028 * it above, as the remaining link would point to 1029 * a directory without "." or ".." entries. 1030 */ 1031 ext2_dec_nlink(xp); 1032 if (doingdirectory) { 1033 if (xp->i_nlink > 2) 1034 panic("ext2_rename: linked directory"); 1035 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1036 tcnp->cn_cred, tcnp->cn_thread); 1037 xp->i_nlink = 0; 1038 } 1039 xp->i_flag |= IN_CHANGE; 1040 vput(tvp); 1041 xp = NULL; 1042 } 1043 1044 /* 1045 * 3) Unlink the source. 1046 */ 1047 fcnp->cn_flags &= ~MODMASK; 1048 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1049 VREF(fdvp); 1050 error = relookup(fdvp, &fvp, fcnp); 1051 if (error == 0) 1052 vrele(fdvp); 1053 if (fvp != NULL) { 1054 xp = VTOI(fvp); 1055 dp = VTOI(fdvp); 1056 } else { 1057 /* 1058 * From name has disappeared. IN_RENAME is not sufficient 1059 * to protect against directory races due to timing windows, 1060 * so we can't panic here. 1061 */ 1062 vrele(ap->a_fvp); 1063 return (0); 1064 } 1065 /* 1066 * Ensure that the directory entry still exists and has not 1067 * changed while the new name has been entered. If the source is 1068 * a file then the entry may have been unlinked or renamed. In 1069 * either case there is no further work to be done. If the source 1070 * is a directory then it cannot have been rmdir'ed; its link 1071 * count of three would cause a rmdir to fail with ENOTEMPTY. 1072 * The IN_RENAME flag ensures that it cannot be moved by another 1073 * rename. 1074 */ 1075 if (xp != ip) { 1076 /* 1077 * From name resolves to a different inode. IN_RENAME is 1078 * not sufficient protection against timing window races 1079 * so we can't panic here. 1080 */ 1081 } else { 1082 /* 1083 * If the source is a directory with a 1084 * new parent, the link count of the old 1085 * parent directory must be decremented 1086 * and ".." set to point to the new parent. 1087 */ 1088 if (doingdirectory && newparent) { 1089 ext2_dec_nlink(dp); 1090 dp->i_flag |= IN_CHANGE; 1091 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1092 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1093 ip->i_e2fs->e2fs_bsize, (off_t)0, 1094 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1095 tcnp->cn_cred, NOCRED, NULL, NULL); 1096 if (error == 0) { 1097 /* Like ufs little-endian: */ 1098 namlen = dirbuf->dotdot_type; 1099 if (namlen != 2 || 1100 dirbuf->dotdot_name[0] != '.' || 1101 dirbuf->dotdot_name[1] != '.') { 1102 ext2_dirbad(xp, (doff_t)12, 1103 "rename: mangled dir"); 1104 } else { 1105 dirbuf->dotdot_ino = htole32(newparent); 1106 /* 1107 * dirblock 0 could be htree root, 1108 * try both csum update functions. 1109 */ 1110 ext2_dirent_csum_set(ip, 1111 (struct ext2fs_direct_2 *)dirbuf); 1112 ext2_dx_csum_set(ip, 1113 (struct ext2fs_direct_2 *)dirbuf); 1114 (void)vn_rdwr(UIO_WRITE, fvp, 1115 (caddr_t)dirbuf, 1116 ip->i_e2fs->e2fs_bsize, 1117 (off_t)0, UIO_SYSSPACE, 1118 IO_NODELOCKED | IO_SYNC | 1119 IO_NOMACCHECK, tcnp->cn_cred, 1120 NOCRED, NULL, NULL); 1121 cache_purge(fdvp); 1122 } 1123 } 1124 free(dirbuf, M_TEMP); 1125 } 1126 error = ext2_dirremove(fdvp, fcnp); 1127 if (!error) { 1128 ext2_dec_nlink(xp); 1129 xp->i_flag |= IN_CHANGE; 1130 } 1131 xp->i_flag &= ~IN_RENAME; 1132 } 1133 if (dp) 1134 vput(fdvp); 1135 if (xp) 1136 vput(fvp); 1137 vrele(ap->a_fvp); 1138 return (error); 1139 1140 bad: 1141 if (xp) 1142 vput(ITOV(xp)); 1143 vput(ITOV(dp)); 1144 out: 1145 if (doingdirectory) 1146 ip->i_flag &= ~IN_RENAME; 1147 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1148 ext2_dec_nlink(ip); 1149 ip->i_flag |= IN_CHANGE; 1150 ip->i_flag &= ~IN_RENAME; 1151 vput(fvp); 1152 } else 1153 vrele(fvp); 1154 return (error); 1155 } 1156 1157 #ifdef UFS_ACL 1158 static int 1159 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1160 mode_t dmode, struct ucred *cred, struct thread *td) 1161 { 1162 int error; 1163 struct inode *ip = VTOI(tvp); 1164 struct acl *dacl, *acl; 1165 1166 acl = acl_alloc(M_WAITOK); 1167 dacl = acl_alloc(M_WAITOK); 1168 1169 /* 1170 * Retrieve default ACL from parent, if any. 1171 */ 1172 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1173 switch (error) { 1174 case 0: 1175 /* 1176 * Retrieved a default ACL, so merge mode and ACL if 1177 * necessary. If the ACL is empty, fall through to 1178 * the "not defined or available" case. 1179 */ 1180 if (acl->acl_cnt != 0) { 1181 dmode = acl_posix1e_newfilemode(dmode, acl); 1182 ip->i_mode = dmode; 1183 *dacl = *acl; 1184 ext2_sync_acl_from_inode(ip, acl); 1185 break; 1186 } 1187 /* FALLTHROUGH */ 1188 1189 case EOPNOTSUPP: 1190 /* 1191 * Just use the mode as-is. 1192 */ 1193 ip->i_mode = dmode; 1194 error = 0; 1195 goto out; 1196 1197 default: 1198 goto out; 1199 } 1200 1201 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1202 if (error == 0) 1203 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1204 switch (error) { 1205 case 0: 1206 break; 1207 1208 case EOPNOTSUPP: 1209 /* 1210 * XXX: This should not happen, as EOPNOTSUPP above 1211 * was supposed to free acl. 1212 */ 1213 #ifdef DEBUG 1214 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1215 #endif /* DEBUG */ 1216 break; 1217 1218 default: 1219 goto out; 1220 } 1221 1222 out: 1223 acl_free(acl); 1224 acl_free(dacl); 1225 1226 return (error); 1227 } 1228 1229 static int 1230 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1231 mode_t mode, struct ucred *cred, struct thread *td) 1232 { 1233 int error; 1234 struct inode *ip = VTOI(tvp); 1235 struct acl *acl; 1236 1237 acl = acl_alloc(M_WAITOK); 1238 1239 /* 1240 * Retrieve default ACL for parent, if any. 1241 */ 1242 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1243 switch (error) { 1244 case 0: 1245 /* 1246 * Retrieved a default ACL, so merge mode and ACL if 1247 * necessary. 1248 */ 1249 if (acl->acl_cnt != 0) { 1250 /* 1251 * Two possible ways for default ACL to not 1252 * be present. First, the EA can be 1253 * undefined, or second, the default ACL can 1254 * be blank. If it's blank, fall through to 1255 * the it's not defined case. 1256 */ 1257 mode = acl_posix1e_newfilemode(mode, acl); 1258 ip->i_mode = mode; 1259 ext2_sync_acl_from_inode(ip, acl); 1260 break; 1261 } 1262 /* FALLTHROUGH */ 1263 1264 case EOPNOTSUPP: 1265 /* 1266 * Just use the mode as-is. 1267 */ 1268 ip->i_mode = mode; 1269 error = 0; 1270 goto out; 1271 1272 default: 1273 goto out; 1274 } 1275 1276 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1277 switch (error) { 1278 case 0: 1279 break; 1280 1281 case EOPNOTSUPP: 1282 /* 1283 * XXX: This should not happen, as EOPNOTSUPP above was 1284 * supposed to free acl. 1285 */ 1286 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1287 "but no VOP_SETACL()\n"); 1288 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1289 "but no VOP_SETACL()"); */ 1290 break; 1291 1292 default: 1293 goto out; 1294 } 1295 1296 out: 1297 acl_free(acl); 1298 1299 return (error); 1300 } 1301 1302 #endif /* UFS_ACL */ 1303 1304 /* 1305 * Mkdir system call 1306 */ 1307 static int 1308 ext2_mkdir(struct vop_mkdir_args *ap) 1309 { 1310 struct m_ext2fs *fs; 1311 struct vnode *dvp = ap->a_dvp; 1312 struct vattr *vap = ap->a_vap; 1313 struct componentname *cnp = ap->a_cnp; 1314 struct inode *ip, *dp; 1315 struct vnode *tvp; 1316 struct dirtemplate dirtemplate, *dtp; 1317 char *buf = NULL; 1318 int error, dmode; 1319 1320 #ifdef INVARIANTS 1321 if ((cnp->cn_flags & HASBUF) == 0) 1322 panic("ext2_mkdir: no name"); 1323 #endif 1324 dp = VTOI(dvp); 1325 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1326 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1327 error = EMLINK; 1328 goto out; 1329 } 1330 dmode = vap->va_mode & 0777; 1331 dmode |= IFDIR; 1332 /* 1333 * Must simulate part of ext2_makeinode here to acquire the inode, 1334 * but not have it entered in the parent directory. The entry is 1335 * made later after writing "." and ".." entries. 1336 */ 1337 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1338 if (error) 1339 goto out; 1340 ip = VTOI(tvp); 1341 fs = ip->i_e2fs; 1342 ip->i_gid = dp->i_gid; 1343 #ifdef SUIDDIR 1344 { 1345 /* 1346 * if we are hacking owners here, (only do this where told to) 1347 * and we are not giving it TOO root, (would subvert quotas) 1348 * then go ahead and give it to the other user. 1349 * The new directory also inherits the SUID bit. 1350 * If user's UID and dir UID are the same, 1351 * 'give it away' so that the SUID is still forced on. 1352 */ 1353 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1354 (dp->i_mode & ISUID) && dp->i_uid) { 1355 dmode |= ISUID; 1356 ip->i_uid = dp->i_uid; 1357 } else { 1358 ip->i_uid = cnp->cn_cred->cr_uid; 1359 } 1360 } 1361 #else 1362 ip->i_uid = cnp->cn_cred->cr_uid; 1363 #endif 1364 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1365 ip->i_mode = dmode; 1366 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1367 ip->i_nlink = 2; 1368 if (cnp->cn_flags & ISWHITEOUT) 1369 ip->i_flags |= UF_OPAQUE; 1370 error = ext2_update(tvp, 1); 1371 1372 /* 1373 * Bump link count in parent directory 1374 * to reflect work done below. Should 1375 * be done before reference is created 1376 * so reparation is possible if we crash. 1377 */ 1378 ext2_inc_nlink(dp); 1379 dp->i_flag |= IN_CHANGE; 1380 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1381 if (error) 1382 goto bad; 1383 1384 /* Initialize directory with "." and ".." from static template. */ 1385 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1386 EXT2F_INCOMPAT_FTYPE)) 1387 dtp = &mastertemplate; 1388 else 1389 dtp = &omastertemplate; 1390 dirtemplate = *dtp; 1391 dirtemplate.dot_ino = htole32(ip->i_number); 1392 dirtemplate.dotdot_ino = htole32(dp->i_number); 1393 /* 1394 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1395 * just redefine it - for this function only 1396 */ 1397 #undef DIRBLKSIZ 1398 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1399 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12); 1400 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1401 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1402 dirtemplate.dotdot_reclen = 1403 htole16(le16toh(dirtemplate.dotdot_reclen) - 1404 sizeof(struct ext2fs_direct_tail)); 1405 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1406 } 1407 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1408 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1409 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1410 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1411 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1412 NULL, NULL); 1413 if (error) { 1414 ext2_dec_nlink(dp); 1415 dp->i_flag |= IN_CHANGE; 1416 goto bad; 1417 } 1418 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1419 /* XXX should grow with balloc() */ 1420 panic("ext2_mkdir: blksize"); 1421 else { 1422 ip->i_size = DIRBLKSIZ; 1423 ip->i_flag |= IN_CHANGE; 1424 } 1425 1426 #ifdef UFS_ACL 1427 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1428 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1429 cnp->cn_cred, cnp->cn_thread); 1430 if (error) 1431 goto bad; 1432 } 1433 1434 #endif /* UFS_ACL */ 1435 1436 /* Directory set up, now install its entry in the parent directory. */ 1437 error = ext2_direnter(ip, dvp, cnp); 1438 if (error) { 1439 ext2_dec_nlink(dp); 1440 dp->i_flag |= IN_CHANGE; 1441 } 1442 bad: 1443 /* 1444 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1445 * for us because we set the link count to 0. 1446 */ 1447 if (error) { 1448 ip->i_nlink = 0; 1449 ip->i_flag |= IN_CHANGE; 1450 vput(tvp); 1451 } else 1452 *ap->a_vpp = tvp; 1453 out: 1454 free(buf, M_TEMP); 1455 return (error); 1456 #undef DIRBLKSIZ 1457 #define DIRBLKSIZ DEV_BSIZE 1458 } 1459 1460 /* 1461 * Rmdir system call. 1462 */ 1463 static int 1464 ext2_rmdir(struct vop_rmdir_args *ap) 1465 { 1466 struct vnode *vp = ap->a_vp; 1467 struct vnode *dvp = ap->a_dvp; 1468 struct componentname *cnp = ap->a_cnp; 1469 struct inode *ip, *dp; 1470 int error; 1471 1472 ip = VTOI(vp); 1473 dp = VTOI(dvp); 1474 1475 /* 1476 * Verify the directory is empty (and valid). 1477 * (Rmdir ".." won't be valid since 1478 * ".." will contain a reference to 1479 * the current directory and thus be 1480 * non-empty.) 1481 */ 1482 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1483 error = ENOTEMPTY; 1484 goto out; 1485 } 1486 if ((dp->i_flags & APPEND) 1487 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1488 error = EPERM; 1489 goto out; 1490 } 1491 /* 1492 * Delete reference to directory before purging 1493 * inode. If we crash in between, the directory 1494 * will be reattached to lost+found, 1495 */ 1496 error = ext2_dirremove(dvp, cnp); 1497 if (error) 1498 goto out; 1499 ext2_dec_nlink(dp); 1500 dp->i_flag |= IN_CHANGE; 1501 cache_purge(dvp); 1502 VOP_UNLOCK(dvp); 1503 /* 1504 * Truncate inode. The only stuff left 1505 * in the directory is "." and "..". 1506 */ 1507 ip->i_nlink = 0; 1508 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1509 cnp->cn_thread); 1510 cache_purge(ITOV(ip)); 1511 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1512 VOP_UNLOCK(vp); 1513 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1514 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1515 } 1516 out: 1517 return (error); 1518 } 1519 1520 /* 1521 * symlink -- make a symbolic link 1522 */ 1523 static int 1524 ext2_symlink(struct vop_symlink_args *ap) 1525 { 1526 struct vnode *vp, **vpp = ap->a_vpp; 1527 struct inode *ip; 1528 int len, error; 1529 1530 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1531 vpp, ap->a_cnp); 1532 if (error) 1533 return (error); 1534 vp = *vpp; 1535 len = strlen(ap->a_target); 1536 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1537 ip = VTOI(vp); 1538 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1539 ip->i_size = len; 1540 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1541 } else 1542 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1543 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1544 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1545 if (error) 1546 vput(vp); 1547 return (error); 1548 } 1549 1550 /* 1551 * Return target name of a symbolic link 1552 */ 1553 static int 1554 ext2_readlink(struct vop_readlink_args *ap) 1555 { 1556 struct vnode *vp = ap->a_vp; 1557 struct inode *ip = VTOI(vp); 1558 int isize; 1559 1560 isize = ip->i_size; 1561 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1562 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1563 return (0); 1564 } 1565 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1566 } 1567 1568 /* 1569 * Calculate the logical to physical mapping if not done already, 1570 * then call the device strategy routine. 1571 * 1572 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1573 * deadlock on memory. See ext2_bmap() for details. 1574 */ 1575 static int 1576 ext2_strategy(struct vop_strategy_args *ap) 1577 { 1578 struct buf *bp = ap->a_bp; 1579 struct vnode *vp = ap->a_vp; 1580 struct bufobj *bo; 1581 daddr_t blkno; 1582 int error; 1583 1584 if (vp->v_type == VBLK || vp->v_type == VCHR) 1585 panic("ext2_strategy: spec"); 1586 if (bp->b_blkno == bp->b_lblkno) { 1587 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1588 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1589 else 1590 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1591 1592 bp->b_blkno = blkno; 1593 if (error) { 1594 bp->b_error = error; 1595 bp->b_ioflags |= BIO_ERROR; 1596 bufdone(bp); 1597 return (0); 1598 } 1599 if ((long)bp->b_blkno == -1) 1600 vfs_bio_clrbuf(bp); 1601 } 1602 if ((long)bp->b_blkno == -1) { 1603 bufdone(bp); 1604 return (0); 1605 } 1606 bp->b_iooffset = dbtob(bp->b_blkno); 1607 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1608 BO_STRATEGY(bo, bp); 1609 return (0); 1610 } 1611 1612 /* 1613 * Print out the contents of an inode. 1614 */ 1615 static int 1616 ext2_print(struct vop_print_args *ap) 1617 { 1618 struct vnode *vp = ap->a_vp; 1619 struct inode *ip = VTOI(vp); 1620 1621 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1622 if (vp->v_type == VFIFO) 1623 fifo_printinfo(vp); 1624 printf("\n"); 1625 return (0); 1626 } 1627 1628 /* 1629 * Close wrapper for fifos. 1630 * 1631 * Update the times on the inode then do device close. 1632 */ 1633 static int 1634 ext2fifo_close(struct vop_close_args *ap) 1635 { 1636 struct vnode *vp = ap->a_vp; 1637 1638 VI_LOCK(vp); 1639 if (vp->v_usecount > 1) 1640 ext2_itimes_locked(vp); 1641 VI_UNLOCK(vp); 1642 return (fifo_specops.vop_close(ap)); 1643 } 1644 1645 /* 1646 * Kqfilter wrapper for fifos. 1647 * 1648 * Fall through to ext2 kqfilter routines if needed 1649 */ 1650 static int 1651 ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1652 { 1653 int error; 1654 1655 error = fifo_specops.vop_kqfilter(ap); 1656 if (error) 1657 error = vfs_kqfilter(ap); 1658 return (error); 1659 } 1660 1661 /* 1662 * Return POSIX pathconf information applicable to ext2 filesystems. 1663 */ 1664 static int 1665 ext2_pathconf(struct vop_pathconf_args *ap) 1666 { 1667 int error = 0; 1668 1669 switch (ap->a_name) { 1670 case _PC_LINK_MAX: 1671 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1672 EXT2F_ROCOMPAT_DIR_NLINK)) 1673 *ap->a_retval = INT_MAX; 1674 else 1675 *ap->a_retval = EXT4_LINK_MAX; 1676 break; 1677 case _PC_NAME_MAX: 1678 *ap->a_retval = NAME_MAX; 1679 break; 1680 case _PC_PIPE_BUF: 1681 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1682 *ap->a_retval = PIPE_BUF; 1683 else 1684 error = EINVAL; 1685 break; 1686 case _PC_CHOWN_RESTRICTED: 1687 *ap->a_retval = 1; 1688 break; 1689 case _PC_NO_TRUNC: 1690 *ap->a_retval = 1; 1691 break; 1692 1693 #ifdef UFS_ACL 1694 case _PC_ACL_EXTENDED: 1695 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1696 *ap->a_retval = 1; 1697 else 1698 *ap->a_retval = 0; 1699 break; 1700 case _PC_ACL_PATH_MAX: 1701 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1702 *ap->a_retval = ACL_MAX_ENTRIES; 1703 else 1704 *ap->a_retval = 3; 1705 break; 1706 #endif /* UFS_ACL */ 1707 1708 case _PC_MIN_HOLE_SIZE: 1709 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1710 break; 1711 case _PC_PRIO_IO: 1712 *ap->a_retval = 0; 1713 break; 1714 case _PC_SYNC_IO: 1715 *ap->a_retval = 0; 1716 break; 1717 case _PC_ALLOC_SIZE_MIN: 1718 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1719 break; 1720 case _PC_FILESIZEBITS: 1721 *ap->a_retval = 64; 1722 break; 1723 case _PC_REC_INCR_XFER_SIZE: 1724 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1725 break; 1726 case _PC_REC_MAX_XFER_SIZE: 1727 *ap->a_retval = -1; /* means ``unlimited'' */ 1728 break; 1729 case _PC_REC_MIN_XFER_SIZE: 1730 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1731 break; 1732 case _PC_REC_XFER_ALIGN: 1733 *ap->a_retval = PAGE_SIZE; 1734 break; 1735 case _PC_SYMLINK_MAX: 1736 *ap->a_retval = MAXPATHLEN; 1737 break; 1738 1739 default: 1740 error = vop_stdpathconf(ap); 1741 break; 1742 } 1743 return (error); 1744 } 1745 1746 /* 1747 * Vnode operation to remove a named attribute. 1748 */ 1749 static int 1750 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1751 { 1752 struct inode *ip; 1753 struct m_ext2fs *fs; 1754 int error; 1755 1756 ip = VTOI(ap->a_vp); 1757 fs = ip->i_e2fs; 1758 1759 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1760 return (EOPNOTSUPP); 1761 1762 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1763 return (EOPNOTSUPP); 1764 1765 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1766 ap->a_cred, ap->a_td, VWRITE); 1767 if (error) 1768 return (error); 1769 1770 error = ENOATTR; 1771 1772 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1773 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1774 if (error != ENOATTR) 1775 return (error); 1776 } 1777 1778 if (ip->i_facl) 1779 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1780 1781 return (error); 1782 } 1783 1784 /* 1785 * Vnode operation to retrieve a named extended attribute. 1786 */ 1787 static int 1788 ext2_getextattr(struct vop_getextattr_args *ap) 1789 { 1790 struct inode *ip; 1791 struct m_ext2fs *fs; 1792 int error; 1793 1794 ip = VTOI(ap->a_vp); 1795 fs = ip->i_e2fs; 1796 1797 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1798 return (EOPNOTSUPP); 1799 1800 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1801 return (EOPNOTSUPP); 1802 1803 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1804 ap->a_cred, ap->a_td, VREAD); 1805 if (error) 1806 return (error); 1807 1808 if (ap->a_size != NULL) 1809 *ap->a_size = 0; 1810 1811 error = ENOATTR; 1812 1813 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1814 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1815 ap->a_name, ap->a_uio, ap->a_size); 1816 if (error != ENOATTR) 1817 return (error); 1818 } 1819 1820 if (ip->i_facl) 1821 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1822 ap->a_name, ap->a_uio, ap->a_size); 1823 1824 return (error); 1825 } 1826 1827 /* 1828 * Vnode operation to retrieve extended attributes on a vnode. 1829 */ 1830 static int 1831 ext2_listextattr(struct vop_listextattr_args *ap) 1832 { 1833 struct inode *ip; 1834 struct m_ext2fs *fs; 1835 int error; 1836 1837 ip = VTOI(ap->a_vp); 1838 fs = ip->i_e2fs; 1839 1840 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1841 return (EOPNOTSUPP); 1842 1843 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1844 return (EOPNOTSUPP); 1845 1846 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1847 ap->a_cred, ap->a_td, VREAD); 1848 if (error) 1849 return (error); 1850 1851 if (ap->a_size != NULL) 1852 *ap->a_size = 0; 1853 1854 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1855 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1856 ap->a_uio, ap->a_size); 1857 if (error) 1858 return (error); 1859 } 1860 1861 if (ip->i_facl) 1862 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1863 ap->a_uio, ap->a_size); 1864 1865 return (error); 1866 } 1867 1868 /* 1869 * Vnode operation to set a named attribute. 1870 */ 1871 static int 1872 ext2_setextattr(struct vop_setextattr_args *ap) 1873 { 1874 struct inode *ip; 1875 struct m_ext2fs *fs; 1876 int error; 1877 1878 ip = VTOI(ap->a_vp); 1879 fs = ip->i_e2fs; 1880 1881 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1882 return (EOPNOTSUPP); 1883 1884 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1885 return (EOPNOTSUPP); 1886 1887 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1888 ap->a_cred, ap->a_td, VWRITE); 1889 if (error) 1890 return (error); 1891 1892 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1893 if (error) 1894 return (error); 1895 1896 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1897 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1898 ap->a_name, ap->a_uio); 1899 if (error != ENOSPC) 1900 return (error); 1901 } 1902 1903 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1904 ap->a_name, ap->a_uio); 1905 1906 return (error); 1907 } 1908 1909 /* 1910 * Vnode pointer to File handle 1911 */ 1912 /* ARGSUSED */ 1913 static int 1914 ext2_vptofh(struct vop_vptofh_args *ap) 1915 { 1916 struct inode *ip; 1917 struct ufid *ufhp; 1918 1919 ip = VTOI(ap->a_vp); 1920 ufhp = (struct ufid *)ap->a_fhp; 1921 ufhp->ufid_len = sizeof(struct ufid); 1922 ufhp->ufid_ino = ip->i_number; 1923 ufhp->ufid_gen = ip->i_gen; 1924 return (0); 1925 } 1926 1927 /* 1928 * Initialize the vnode associated with a new inode, handle aliased 1929 * vnodes. 1930 */ 1931 int 1932 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1933 { 1934 struct inode *ip; 1935 struct vnode *vp; 1936 1937 vp = *vpp; 1938 ip = VTOI(vp); 1939 vp->v_type = IFTOVT(ip->i_mode); 1940 /* 1941 * Only unallocated inodes should be of type VNON. 1942 */ 1943 if (ip->i_mode != 0 && vp->v_type == VNON) 1944 return (EINVAL); 1945 if (vp->v_type == VFIFO) 1946 vp->v_op = fifoops; 1947 1948 if (ip->i_number == EXT2_ROOTINO) 1949 vp->v_vflag |= VV_ROOT; 1950 ip->i_modrev = init_va_filerev(); 1951 *vpp = vp; 1952 return (0); 1953 } 1954 1955 /* 1956 * Allocate a new inode. 1957 */ 1958 static int 1959 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1960 struct componentname *cnp) 1961 { 1962 struct inode *ip, *pdir; 1963 struct vnode *tvp; 1964 int error; 1965 1966 pdir = VTOI(dvp); 1967 #ifdef INVARIANTS 1968 if ((cnp->cn_flags & HASBUF) == 0) 1969 panic("ext2_makeinode: no name"); 1970 #endif 1971 *vpp = NULL; 1972 if ((mode & IFMT) == 0) 1973 mode |= IFREG; 1974 1975 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1976 if (error) { 1977 return (error); 1978 } 1979 ip = VTOI(tvp); 1980 ip->i_gid = pdir->i_gid; 1981 #ifdef SUIDDIR 1982 { 1983 /* 1984 * if we are 1985 * not the owner of the directory, 1986 * and we are hacking owners here, (only do this where told to) 1987 * and we are not giving it TOO root, (would subvert quotas) 1988 * then go ahead and give it to the other user. 1989 * Note that this drops off the execute bits for security. 1990 */ 1991 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1992 (pdir->i_mode & ISUID) && 1993 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1994 ip->i_uid = pdir->i_uid; 1995 mode &= ~07111; 1996 } else { 1997 ip->i_uid = cnp->cn_cred->cr_uid; 1998 } 1999 } 2000 #else 2001 ip->i_uid = cnp->cn_cred->cr_uid; 2002 #endif 2003 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 2004 ip->i_mode = mode; 2005 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 2006 ip->i_nlink = 1; 2007 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 2008 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 2009 ip->i_mode &= ~ISGID; 2010 } 2011 2012 if (cnp->cn_flags & ISWHITEOUT) 2013 ip->i_flags |= UF_OPAQUE; 2014 2015 /* 2016 * Make sure inode goes to disk before directory entry. 2017 */ 2018 error = ext2_update(tvp, !DOINGASYNC(tvp)); 2019 if (error) 2020 goto bad; 2021 2022 #ifdef UFS_ACL 2023 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 2024 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 2025 cnp->cn_cred, cnp->cn_thread); 2026 if (error) 2027 goto bad; 2028 } 2029 #endif /* UFS_ACL */ 2030 2031 error = ext2_direnter(ip, dvp, cnp); 2032 if (error) 2033 goto bad; 2034 2035 *vpp = tvp; 2036 return (0); 2037 2038 bad: 2039 /* 2040 * Write error occurred trying to update the inode 2041 * or the directory so must deallocate the inode. 2042 */ 2043 ip->i_nlink = 0; 2044 ip->i_flag |= IN_CHANGE; 2045 vput(tvp); 2046 return (error); 2047 } 2048 2049 /* 2050 * Vnode op for reading. 2051 */ 2052 static int 2053 ext2_read(struct vop_read_args *ap) 2054 { 2055 struct vnode *vp; 2056 struct inode *ip; 2057 struct uio *uio; 2058 struct m_ext2fs *fs; 2059 struct buf *bp; 2060 daddr_t lbn, nextlbn; 2061 off_t bytesinfile; 2062 long size, xfersize, blkoffset; 2063 int error, orig_resid, seqcount; 2064 int ioflag; 2065 2066 vp = ap->a_vp; 2067 uio = ap->a_uio; 2068 ioflag = ap->a_ioflag; 2069 2070 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2071 ip = VTOI(vp); 2072 2073 #ifdef INVARIANTS 2074 if (uio->uio_rw != UIO_READ) 2075 panic("%s: mode", "ext2_read"); 2076 2077 if (vp->v_type == VLNK) { 2078 if ((int)ip->i_size < 2079 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) 2080 panic("%s: short symlink", "ext2_read"); 2081 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2082 panic("%s: type %d", "ext2_read", vp->v_type); 2083 #endif 2084 orig_resid = uio->uio_resid; 2085 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2086 if (orig_resid == 0) 2087 return (0); 2088 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2089 fs = ip->i_e2fs; 2090 if (uio->uio_offset < ip->i_size && 2091 uio->uio_offset >= fs->e2fs_maxfilesize) 2092 return (EOVERFLOW); 2093 2094 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2095 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2096 break; 2097 lbn = lblkno(fs, uio->uio_offset); 2098 nextlbn = lbn + 1; 2099 size = blksize(fs, ip, lbn); 2100 blkoffset = blkoff(fs, uio->uio_offset); 2101 2102 xfersize = fs->e2fs_fsize - blkoffset; 2103 if (uio->uio_resid < xfersize) 2104 xfersize = uio->uio_resid; 2105 if (bytesinfile < xfersize) 2106 xfersize = bytesinfile; 2107 2108 if (lblktosize(fs, nextlbn) >= ip->i_size) 2109 error = bread(vp, lbn, size, NOCRED, &bp); 2110 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2111 error = cluster_read(vp, ip->i_size, lbn, size, 2112 NOCRED, blkoffset + uio->uio_resid, seqcount, 2113 0, &bp); 2114 } else if (seqcount > 1) { 2115 u_int nextsize = blksize(fs, ip, nextlbn); 2116 2117 error = breadn(vp, lbn, 2118 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2119 } else 2120 error = bread(vp, lbn, size, NOCRED, &bp); 2121 if (error) { 2122 brelse(bp); 2123 bp = NULL; 2124 break; 2125 } 2126 2127 /* 2128 * We should only get non-zero b_resid when an I/O error 2129 * has occurred, which should cause us to break above. 2130 * However, if the short read did not cause an error, 2131 * then we want to ensure that we do not uiomove bad 2132 * or uninitialized data. 2133 */ 2134 size -= bp->b_resid; 2135 if (size < xfersize) { 2136 if (size == 0) 2137 break; 2138 xfersize = size; 2139 } 2140 error = uiomove((char *)bp->b_data + blkoffset, 2141 (int)xfersize, uio); 2142 if (error) 2143 break; 2144 vfs_bio_brelse(bp, ioflag); 2145 } 2146 2147 /* 2148 * This can only happen in the case of an error because the loop 2149 * above resets bp to NULL on each iteration and on normal 2150 * completion has not set a new value into it. so it must have come 2151 * from a 'break' statement 2152 */ 2153 if (bp != NULL) 2154 vfs_bio_brelse(bp, ioflag); 2155 2156 if ((error == 0 || uio->uio_resid != orig_resid) && 2157 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2158 ip->i_flag |= IN_ACCESS; 2159 return (error); 2160 } 2161 2162 static int 2163 ext2_ioctl(struct vop_ioctl_args *ap) 2164 { 2165 struct vnode *vp; 2166 int error; 2167 2168 vp = ap->a_vp; 2169 switch (ap->a_command) { 2170 case FIOSEEKDATA: 2171 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) { 2172 error = vn_lock(vp, LK_SHARED); 2173 if (error == 0) { 2174 error = ext2_bmap_seekdata(vp, 2175 (off_t *)ap->a_data); 2176 VOP_UNLOCK(vp); 2177 } else 2178 error = EBADF; 2179 return (error); 2180 } 2181 case FIOSEEKHOLE: 2182 return (vn_bmap_seekhole(vp, ap->a_command, 2183 (off_t *)ap->a_data, ap->a_cred)); 2184 default: 2185 return (ENOTTY); 2186 } 2187 } 2188 2189 /* 2190 * Vnode op for writing. 2191 */ 2192 static int 2193 ext2_write(struct vop_write_args *ap) 2194 { 2195 struct vnode *vp; 2196 struct uio *uio; 2197 struct inode *ip; 2198 struct m_ext2fs *fs; 2199 struct buf *bp; 2200 daddr_t lbn; 2201 off_t osize; 2202 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2203 2204 ioflag = ap->a_ioflag; 2205 uio = ap->a_uio; 2206 vp = ap->a_vp; 2207 2208 seqcount = ioflag >> IO_SEQSHIFT; 2209 ip = VTOI(vp); 2210 2211 #ifdef INVARIANTS 2212 if (uio->uio_rw != UIO_WRITE) 2213 panic("%s: mode", "ext2_write"); 2214 #endif 2215 2216 switch (vp->v_type) { 2217 case VREG: 2218 if (ioflag & IO_APPEND) 2219 uio->uio_offset = ip->i_size; 2220 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2221 return (EPERM); 2222 /* FALLTHROUGH */ 2223 case VLNK: 2224 break; 2225 case VDIR: 2226 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2227 if ((ioflag & IO_SYNC) == 0) 2228 panic("ext2_write: nonsync dir write"); 2229 break; 2230 default: 2231 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2232 vp->v_type, (intmax_t)uio->uio_offset, 2233 (intmax_t)uio->uio_resid); 2234 } 2235 2236 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2237 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2238 fs = ip->i_e2fs; 2239 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2240 return (EFBIG); 2241 /* 2242 * Maybe this should be above the vnode op call, but so long as 2243 * file servers have no limits, I don't think it matters. 2244 */ 2245 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 2246 return (EFBIG); 2247 2248 resid = uio->uio_resid; 2249 osize = ip->i_size; 2250 if (seqcount > BA_SEQMAX) 2251 flags = BA_SEQMAX << BA_SEQSHIFT; 2252 else 2253 flags = seqcount << BA_SEQSHIFT; 2254 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2255 flags |= IO_SYNC; 2256 2257 for (error = 0; uio->uio_resid > 0;) { 2258 lbn = lblkno(fs, uio->uio_offset); 2259 blkoffset = blkoff(fs, uio->uio_offset); 2260 xfersize = fs->e2fs_fsize - blkoffset; 2261 if (uio->uio_resid < xfersize) 2262 xfersize = uio->uio_resid; 2263 if (uio->uio_offset + xfersize > ip->i_size) 2264 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2265 2266 /* 2267 * We must perform a read-before-write if the transfer size 2268 * does not cover the entire buffer. 2269 */ 2270 if (fs->e2fs_bsize > xfersize) 2271 flags |= BA_CLRBUF; 2272 else 2273 flags &= ~BA_CLRBUF; 2274 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2275 ap->a_cred, &bp, flags); 2276 if (error != 0) 2277 break; 2278 2279 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2280 bp->b_flags |= B_NOCACHE; 2281 if (uio->uio_offset + xfersize > ip->i_size) 2282 ip->i_size = uio->uio_offset + xfersize; 2283 size = blksize(fs, ip, lbn) - bp->b_resid; 2284 if (size < xfersize) 2285 xfersize = size; 2286 2287 error = 2288 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2289 /* 2290 * If the buffer is not already filled and we encounter an 2291 * error while trying to fill it, we have to clear out any 2292 * garbage data from the pages instantiated for the buffer. 2293 * If we do not, a failed uiomove() during a write can leave 2294 * the prior contents of the pages exposed to a userland mmap. 2295 * 2296 * Note that we need only clear buffers with a transfer size 2297 * equal to the block size because buffers with a shorter 2298 * transfer size were cleared above by the call to ext2_balloc() 2299 * with the BA_CLRBUF flag set. 2300 * 2301 * If the source region for uiomove identically mmaps the 2302 * buffer, uiomove() performed the NOP copy, and the buffer 2303 * content remains valid because the page fault handler 2304 * validated the pages. 2305 */ 2306 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2307 fs->e2fs_bsize == xfersize) 2308 vfs_bio_clrbuf(bp); 2309 2310 vfs_bio_set_flags(bp, ioflag); 2311 2312 /* 2313 * If IO_SYNC each buffer is written synchronously. Otherwise 2314 * if we have a severe page deficiency write the buffer 2315 * asynchronously. Otherwise try to cluster, and if that 2316 * doesn't do it then either do an async write (if O_DIRECT), 2317 * or a delayed write (if not). 2318 */ 2319 if (ioflag & IO_SYNC) { 2320 (void)bwrite(bp); 2321 } else if (vm_page_count_severe() || 2322 buf_dirty_count_severe() || 2323 (ioflag & IO_ASYNC)) { 2324 bp->b_flags |= B_CLUSTEROK; 2325 bawrite(bp); 2326 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2327 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2328 bp->b_flags |= B_CLUSTEROK; 2329 cluster_write(vp, &ip->i_clusterw, bp, 2330 ip->i_size, seqcount, 0); 2331 } else { 2332 bawrite(bp); 2333 } 2334 } else if (ioflag & IO_DIRECT) { 2335 bp->b_flags |= B_CLUSTEROK; 2336 bawrite(bp); 2337 } else { 2338 bp->b_flags |= B_CLUSTEROK; 2339 bdwrite(bp); 2340 } 2341 if (error || xfersize == 0) 2342 break; 2343 } 2344 /* 2345 * If we successfully wrote any data, and we are not the superuser 2346 * we clear the setuid and setgid bits as a precaution against 2347 * tampering. 2348 */ 2349 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2350 ap->a_cred) { 2351 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2352 ip->i_mode &= ~(ISUID | ISGID); 2353 } 2354 if (error) { 2355 if (ioflag & IO_UNIT) { 2356 (void)ext2_truncate(vp, osize, 2357 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2358 uio->uio_offset -= resid - uio->uio_resid; 2359 uio->uio_resid = resid; 2360 } 2361 } 2362 if (uio->uio_resid != resid) { 2363 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2364 if (ioflag & IO_SYNC) 2365 error = ext2_update(vp, 1); 2366 } 2367 return (error); 2368 } 2369