1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * SPDX-License-Identifier: BSD-3-Clause 9 * 10 * Copyright (c) 1982, 1986, 1989, 1993 11 * The Regents of the University of California. All rights reserved. 12 * (c) UNIX System Laboratories, Inc. 13 * All or some portions of this file are derived from material licensed 14 * to the University of California by American Telephone and Telegraph 15 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 16 * the permission of UNIX System Laboratories, Inc. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94 43 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 44 * $FreeBSD$ 45 */ 46 47 #include "opt_suiddir.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/fcntl.h> 53 #include <sys/filio.h> 54 #include <sys/limits.h> 55 #include <sys/sdt.h> 56 #include <sys/stat.h> 57 #include <sys/bio.h> 58 #include <sys/buf.h> 59 #include <sys/endian.h> 60 #include <sys/priv.h> 61 #include <sys/rwlock.h> 62 #include <sys/mount.h> 63 #include <sys/unistd.h> 64 #include <sys/time.h> 65 #include <sys/vnode.h> 66 #include <sys/namei.h> 67 #include <sys/lockf.h> 68 #include <sys/event.h> 69 #include <sys/conf.h> 70 #include <sys/file.h> 71 #include <sys/extattr.h> 72 #include <sys/vmmeter.h> 73 74 #include <vm/vm.h> 75 #include <vm/vm_param.h> 76 #include <vm/vm_extern.h> 77 #include <vm/vm_object.h> 78 #include <vm/vm_page.h> 79 #include <vm/vm_pager.h> 80 #include <vm/vnode_pager.h> 81 82 #include "opt_directio.h" 83 84 #include <ufs/ufs/dir.h> 85 86 #include <fs/ext2fs/fs.h> 87 #include <fs/ext2fs/inode.h> 88 #include <fs/ext2fs/ext2_acl.h> 89 #include <fs/ext2fs/ext2fs.h> 90 #include <fs/ext2fs/ext2_extern.h> 91 #include <fs/ext2fs/ext2_dinode.h> 92 #include <fs/ext2fs/ext2_dir.h> 93 #include <fs/ext2fs/ext2_mount.h> 94 #include <fs/ext2fs/ext2_extattr.h> 95 #include <fs/ext2fs/ext2_extents.h> 96 97 SDT_PROVIDER_DECLARE(ext2fs); 98 /* 99 * ext2fs trace probe: 100 * arg0: verbosity. Higher numbers give more verbose messages 101 * arg1: Textual message 102 */ 103 SDT_PROBE_DEFINE2(ext2fs, , vnops, trace, "int", "char*"); 104 105 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 106 static void ext2_itimes_locked(struct vnode *); 107 108 static vop_access_t ext2_access; 109 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 110 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 111 struct thread *); 112 static vop_close_t ext2_close; 113 static vop_create_t ext2_create; 114 static vop_fsync_t ext2_fsync; 115 static vop_getattr_t ext2_getattr; 116 static vop_ioctl_t ext2_ioctl; 117 static vop_link_t ext2_link; 118 static vop_mkdir_t ext2_mkdir; 119 static vop_mknod_t ext2_mknod; 120 static vop_open_t ext2_open; 121 static vop_pathconf_t ext2_pathconf; 122 static vop_print_t ext2_print; 123 static vop_read_t ext2_read; 124 static vop_readlink_t ext2_readlink; 125 static vop_remove_t ext2_remove; 126 static vop_rename_t ext2_rename; 127 static vop_rmdir_t ext2_rmdir; 128 static vop_setattr_t ext2_setattr; 129 static vop_strategy_t ext2_strategy; 130 static vop_symlink_t ext2_symlink; 131 static vop_write_t ext2_write; 132 static vop_deleteextattr_t ext2_deleteextattr; 133 static vop_getextattr_t ext2_getextattr; 134 static vop_listextattr_t ext2_listextattr; 135 static vop_setextattr_t ext2_setextattr; 136 static vop_vptofh_t ext2_vptofh; 137 static vop_close_t ext2fifo_close; 138 139 /* Global vfs data structures for ext2. */ 140 struct vop_vector ext2_vnodeops = { 141 .vop_default = &default_vnodeops, 142 .vop_access = ext2_access, 143 .vop_bmap = ext2_bmap, 144 .vop_cachedlookup = ext2_lookup, 145 .vop_close = ext2_close, 146 .vop_create = ext2_create, 147 .vop_fsync = ext2_fsync, 148 .vop_getpages = vnode_pager_local_getpages, 149 .vop_getpages_async = vnode_pager_local_getpages_async, 150 .vop_getattr = ext2_getattr, 151 .vop_inactive = ext2_inactive, 152 .vop_ioctl = ext2_ioctl, 153 .vop_link = ext2_link, 154 .vop_lookup = vfs_cache_lookup, 155 .vop_mkdir = ext2_mkdir, 156 .vop_mknod = ext2_mknod, 157 .vop_open = ext2_open, 158 .vop_pathconf = ext2_pathconf, 159 .vop_poll = vop_stdpoll, 160 .vop_print = ext2_print, 161 .vop_read = ext2_read, 162 .vop_readdir = ext2_readdir, 163 .vop_readlink = ext2_readlink, 164 .vop_reallocblks = ext2_reallocblks, 165 .vop_reclaim = ext2_reclaim, 166 .vop_remove = ext2_remove, 167 .vop_rename = ext2_rename, 168 .vop_rmdir = ext2_rmdir, 169 .vop_setattr = ext2_setattr, 170 .vop_strategy = ext2_strategy, 171 .vop_symlink = ext2_symlink, 172 .vop_write = ext2_write, 173 .vop_deleteextattr = ext2_deleteextattr, 174 .vop_getextattr = ext2_getextattr, 175 .vop_listextattr = ext2_listextattr, 176 .vop_setextattr = ext2_setextattr, 177 #ifdef UFS_ACL 178 .vop_getacl = ext2_getacl, 179 .vop_setacl = ext2_setacl, 180 .vop_aclcheck = ext2_aclcheck, 181 #endif /* UFS_ACL */ 182 .vop_vptofh = ext2_vptofh, 183 }; 184 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops); 185 186 struct vop_vector ext2_fifoops = { 187 .vop_default = &fifo_specops, 188 .vop_access = ext2_access, 189 .vop_close = ext2fifo_close, 190 .vop_fsync = ext2_fsync, 191 .vop_getattr = ext2_getattr, 192 .vop_inactive = ext2_inactive, 193 .vop_pathconf = ext2_pathconf, 194 .vop_print = ext2_print, 195 .vop_read = VOP_PANIC, 196 .vop_reclaim = ext2_reclaim, 197 .vop_setattr = ext2_setattr, 198 .vop_write = VOP_PANIC, 199 .vop_vptofh = ext2_vptofh, 200 }; 201 VFS_VOP_VECTOR_REGISTER(ext2_fifoops); 202 203 /* 204 * A virgin directory (no blushing please). 205 * Note that the type and namlen fields are reversed relative to ext2. 206 * Also, we don't use `struct odirtemplate', since it would just cause 207 * endianness problems. 208 */ 209 static struct dirtemplate mastertemplate = { 210 0, htole16(12), 1, EXT2_FT_DIR, ".", 211 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".." 212 }; 213 static struct dirtemplate omastertemplate = { 214 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".", 215 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".." 216 }; 217 218 static void 219 ext2_itimes_locked(struct vnode *vp) 220 { 221 struct inode *ip; 222 struct timespec ts; 223 224 ASSERT_VI_LOCKED(vp, __func__); 225 226 ip = VTOI(vp); 227 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 228 return; 229 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 230 ip->i_flag |= IN_LAZYMOD; 231 else 232 ip->i_flag |= IN_MODIFIED; 233 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 234 vfs_timestamp(&ts); 235 if (ip->i_flag & IN_ACCESS) { 236 ip->i_atime = ts.tv_sec; 237 ip->i_atimensec = ts.tv_nsec; 238 } 239 if (ip->i_flag & IN_UPDATE) { 240 ip->i_mtime = ts.tv_sec; 241 ip->i_mtimensec = ts.tv_nsec; 242 ip->i_modrev++; 243 } 244 if (ip->i_flag & IN_CHANGE) { 245 ip->i_ctime = ts.tv_sec; 246 ip->i_ctimensec = ts.tv_nsec; 247 } 248 } 249 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 250 } 251 252 void 253 ext2_itimes(struct vnode *vp) 254 { 255 256 VI_LOCK(vp); 257 ext2_itimes_locked(vp); 258 VI_UNLOCK(vp); 259 } 260 261 /* 262 * Create a regular file 263 */ 264 static int 265 ext2_create(struct vop_create_args *ap) 266 { 267 int error; 268 269 error = 270 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 271 ap->a_dvp, ap->a_vpp, ap->a_cnp); 272 if (error != 0) 273 return (error); 274 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 275 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 276 return (0); 277 } 278 279 static int 280 ext2_open(struct vop_open_args *ap) 281 { 282 283 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 284 return (EOPNOTSUPP); 285 286 /* 287 * Files marked append-only must be opened for appending. 288 */ 289 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 290 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 291 return (EPERM); 292 293 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 294 295 return (0); 296 } 297 298 /* 299 * Close called. 300 * 301 * Update the times on the inode. 302 */ 303 static int 304 ext2_close(struct vop_close_args *ap) 305 { 306 struct vnode *vp = ap->a_vp; 307 308 VI_LOCK(vp); 309 if (vp->v_usecount > 1) 310 ext2_itimes_locked(vp); 311 VI_UNLOCK(vp); 312 return (0); 313 } 314 315 static int 316 ext2_access(struct vop_access_args *ap) 317 { 318 struct vnode *vp = ap->a_vp; 319 struct inode *ip = VTOI(vp); 320 accmode_t accmode = ap->a_accmode; 321 int error; 322 323 /* 324 * Disallow write attempts on read-only file systems; 325 * unless the file is a socket, fifo, or a block or 326 * character device resident on the file system. 327 */ 328 if (accmode & VWRITE) { 329 switch (vp->v_type) { 330 case VDIR: 331 case VLNK: 332 case VREG: 333 if (vp->v_mount->mnt_flag & MNT_RDONLY) 334 return (EROFS); 335 break; 336 default: 337 break; 338 } 339 } 340 341 /* If immutable bit set, nobody gets to write it. */ 342 if ((accmode & VWRITE) && (ip->i_flags & SF_IMMUTABLE)) 343 return (EPERM); 344 345 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 346 ap->a_accmode, ap->a_cred); 347 return (error); 348 } 349 350 static int 351 ext2_getattr(struct vop_getattr_args *ap) 352 { 353 struct vnode *vp = ap->a_vp; 354 struct inode *ip = VTOI(vp); 355 struct vattr *vap = ap->a_vap; 356 357 ext2_itimes(vp); 358 /* 359 * Copy from inode table 360 */ 361 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 362 vap->va_fileid = ip->i_number; 363 vap->va_mode = ip->i_mode & ~IFMT; 364 vap->va_nlink = ip->i_nlink; 365 vap->va_uid = ip->i_uid; 366 vap->va_gid = ip->i_gid; 367 vap->va_rdev = ip->i_rdev; 368 vap->va_size = ip->i_size; 369 vap->va_atime.tv_sec = ip->i_atime; 370 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 371 vap->va_mtime.tv_sec = ip->i_mtime; 372 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 373 vap->va_ctime.tv_sec = ip->i_ctime; 374 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 375 if (E2DI_HAS_XTIME(ip)) { 376 vap->va_birthtime.tv_sec = ip->i_birthtime; 377 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 378 } 379 vap->va_flags = ip->i_flags; 380 vap->va_gen = ip->i_gen; 381 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 382 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 383 vap->va_type = IFTOVT(ip->i_mode); 384 vap->va_filerev = ip->i_modrev; 385 return (0); 386 } 387 388 /* 389 * Set attribute vnode op. called from several syscalls 390 */ 391 static int 392 ext2_setattr(struct vop_setattr_args *ap) 393 { 394 struct vattr *vap = ap->a_vap; 395 struct vnode *vp = ap->a_vp; 396 struct inode *ip = VTOI(vp); 397 struct ucred *cred = ap->a_cred; 398 struct thread *td = curthread; 399 int error; 400 401 /* 402 * Check for unsettable attributes. 403 */ 404 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 405 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 406 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 407 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 408 return (EINVAL); 409 } 410 if (vap->va_flags != VNOVAL) { 411 /* Disallow flags not supported by ext2fs. */ 412 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 413 return (EOPNOTSUPP); 414 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return (EROFS); 417 /* 418 * Callers may only modify the file flags on objects they 419 * have VADMIN rights for. 420 */ 421 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 422 return (error); 423 /* 424 * Unprivileged processes and privileged processes in 425 * jail() are not permitted to unset system flags, or 426 * modify flags if any system flags are set. 427 * Privileged non-jail processes may not modify system flags 428 * if securelevel > 0 and any existing system flags are set. 429 */ 430 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 431 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 432 error = securelevel_gt(cred, 0); 433 if (error) 434 return (error); 435 } 436 } else { 437 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 438 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 439 return (EPERM); 440 } 441 ip->i_flags = vap->va_flags; 442 ip->i_flag |= IN_CHANGE; 443 if (ip->i_flags & (IMMUTABLE | APPEND)) 444 return (0); 445 } 446 if (ip->i_flags & (IMMUTABLE | APPEND)) 447 return (EPERM); 448 /* 449 * Go through the fields and update iff not VNOVAL. 450 */ 451 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 452 if (vp->v_mount->mnt_flag & MNT_RDONLY) 453 return (EROFS); 454 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 455 td)) != 0) 456 return (error); 457 } 458 if (vap->va_size != VNOVAL) { 459 /* 460 * Disallow write attempts on read-only file systems; 461 * unless the file is a socket, fifo, or a block or 462 * character device resident on the file system. 463 */ 464 switch (vp->v_type) { 465 case VDIR: 466 return (EISDIR); 467 case VLNK: 468 case VREG: 469 if (vp->v_mount->mnt_flag & MNT_RDONLY) 470 return (EROFS); 471 break; 472 default: 473 break; 474 } 475 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 476 return (error); 477 } 478 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 479 if (vp->v_mount->mnt_flag & MNT_RDONLY) 480 return (EROFS); 481 /* 482 * From utimes(2): 483 * If times is NULL, ... The caller must be the owner of 484 * the file, have permission to write the file, or be the 485 * super-user. 486 * If times is non-NULL, ... The caller must be the owner of 487 * the file or be the super-user. 488 */ 489 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 490 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 491 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 492 return (error); 493 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 494 if (vap->va_atime.tv_sec != VNOVAL) { 495 ip->i_flag &= ~IN_ACCESS; 496 ip->i_atime = vap->va_atime.tv_sec; 497 ip->i_atimensec = vap->va_atime.tv_nsec; 498 } 499 if (vap->va_mtime.tv_sec != VNOVAL) { 500 ip->i_flag &= ~IN_UPDATE; 501 ip->i_mtime = vap->va_mtime.tv_sec; 502 ip->i_mtimensec = vap->va_mtime.tv_nsec; 503 } 504 if (E2DI_HAS_XTIME(ip) && vap->va_birthtime.tv_sec != VNOVAL) { 505 ip->i_birthtime = vap->va_birthtime.tv_sec; 506 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 507 } 508 error = ext2_update(vp, 0); 509 if (error) 510 return (error); 511 } 512 error = 0; 513 if (vap->va_mode != (mode_t)VNOVAL) { 514 if (vp->v_mount->mnt_flag & MNT_RDONLY) 515 return (EROFS); 516 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 517 } 518 return (error); 519 } 520 521 /* 522 * Change the mode on a file. 523 * Inode must be locked before calling. 524 */ 525 static int 526 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 527 { 528 struct inode *ip = VTOI(vp); 529 int error; 530 531 /* 532 * To modify the permissions on a file, must possess VADMIN 533 * for that file. 534 */ 535 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 536 return (error); 537 /* 538 * Privileged processes may set the sticky bit on non-directories, 539 * as well as set the setgid bit on a file with a group that the 540 * process is not a member of. 541 */ 542 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 543 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 544 if (error) 545 return (EFTYPE); 546 } 547 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 548 error = priv_check_cred(cred, PRIV_VFS_SETGID); 549 if (error) 550 return (error); 551 } 552 ip->i_mode &= ~ALLPERMS; 553 ip->i_mode |= (mode & ALLPERMS); 554 ip->i_flag |= IN_CHANGE; 555 return (0); 556 } 557 558 /* 559 * Perform chown operation on inode ip; 560 * inode must be locked prior to call. 561 */ 562 static int 563 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 564 struct thread *td) 565 { 566 struct inode *ip = VTOI(vp); 567 uid_t ouid; 568 gid_t ogid; 569 int error = 0; 570 571 if (uid == (uid_t)VNOVAL) 572 uid = ip->i_uid; 573 if (gid == (gid_t)VNOVAL) 574 gid = ip->i_gid; 575 /* 576 * To modify the ownership of a file, must possess VADMIN 577 * for that file. 578 */ 579 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 580 return (error); 581 /* 582 * To change the owner of a file, or change the group of a file 583 * to a group of which we are not a member, the caller must 584 * have privilege. 585 */ 586 if (uid != ip->i_uid || (gid != ip->i_gid && 587 !groupmember(gid, cred))) { 588 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 589 if (error) 590 return (error); 591 } 592 ogid = ip->i_gid; 593 ouid = ip->i_uid; 594 ip->i_gid = gid; 595 ip->i_uid = uid; 596 ip->i_flag |= IN_CHANGE; 597 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 598 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 599 ip->i_mode &= ~(ISUID | ISGID); 600 } 601 return (0); 602 } 603 604 /* 605 * Synch an open file. 606 */ 607 /* ARGSUSED */ 608 static int 609 ext2_fsync(struct vop_fsync_args *ap) 610 { 611 /* 612 * Flush all dirty buffers associated with a vnode. 613 */ 614 615 vop_stdfsync(ap); 616 617 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 618 } 619 620 static int 621 ext2_check_mknod_limits(dev_t dev) 622 { 623 unsigned maj = major(dev); 624 unsigned min = minor(dev); 625 626 if (maj > EXT2_MAJOR_MAX || min > EXT2_MINOR_MAX) 627 return (EINVAL); 628 629 return (0); 630 } 631 632 /* 633 * Mknod vnode call 634 */ 635 /* ARGSUSED */ 636 static int 637 ext2_mknod(struct vop_mknod_args *ap) 638 { 639 struct vattr *vap = ap->a_vap; 640 struct vnode **vpp = ap->a_vpp; 641 struct inode *ip; 642 ino_t ino; 643 int error; 644 645 if (vap->va_rdev != VNOVAL) { 646 error = ext2_check_mknod_limits(vap->va_rdev); 647 if (error) 648 return (error); 649 } 650 651 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 652 ap->a_dvp, vpp, ap->a_cnp); 653 if (error) 654 return (error); 655 ip = VTOI(*vpp); 656 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 657 if (vap->va_rdev != VNOVAL) 658 ip->i_rdev = vap->va_rdev; 659 660 /* 661 * Remove inode, then reload it through VFS_VGET so it is 662 * checked to see if it is an alias of an existing entry in 663 * the inode cache. XXX I don't believe this is necessary now. 664 */ 665 (*vpp)->v_type = VNON; 666 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 667 vgone(*vpp); 668 vput(*vpp); 669 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 670 if (error) { 671 *vpp = NULL; 672 return (error); 673 } 674 return (0); 675 } 676 677 static int 678 ext2_remove(struct vop_remove_args *ap) 679 { 680 struct inode *ip; 681 struct vnode *vp = ap->a_vp; 682 struct vnode *dvp = ap->a_dvp; 683 int error; 684 685 ip = VTOI(vp); 686 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 687 (VTOI(dvp)->i_flags & APPEND)) { 688 error = EPERM; 689 goto out; 690 } 691 error = ext2_dirremove(dvp, ap->a_cnp); 692 if (error == 0) { 693 ip->i_nlink--; 694 ip->i_flag |= IN_CHANGE; 695 } 696 out: 697 return (error); 698 } 699 700 /* 701 * link vnode call 702 */ 703 static int 704 ext2_link(struct vop_link_args *ap) 705 { 706 struct vnode *vp = ap->a_vp; 707 struct vnode *tdvp = ap->a_tdvp; 708 struct componentname *cnp = ap->a_cnp; 709 struct inode *ip; 710 int error; 711 712 #ifdef INVARIANTS 713 if ((cnp->cn_flags & HASBUF) == 0) 714 panic("ext2_link: no name"); 715 #endif 716 ip = VTOI(vp); 717 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 718 error = EMLINK; 719 goto out; 720 } 721 if (ip->i_flags & (IMMUTABLE | APPEND)) { 722 error = EPERM; 723 goto out; 724 } 725 ip->i_nlink++; 726 ip->i_flag |= IN_CHANGE; 727 error = ext2_update(vp, !DOINGASYNC(vp)); 728 if (!error) 729 error = ext2_direnter(ip, tdvp, cnp); 730 if (error) { 731 ip->i_nlink--; 732 ip->i_flag |= IN_CHANGE; 733 } 734 out: 735 return (error); 736 } 737 738 static int 739 ext2_inc_nlink(struct inode *ip) 740 { 741 742 ip->i_nlink++; 743 744 if (S_ISDIR(ip->i_mode) && 745 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 746 ip->i_nlink > 1) { 747 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 748 ip->i_nlink = 1; 749 } else if (ip->i_nlink > EXT4_LINK_MAX) { 750 ip->i_nlink--; 751 return (EMLINK); 752 } 753 754 return (0); 755 } 756 757 static void 758 ext2_dec_nlink(struct inode *ip) 759 { 760 761 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 762 ip->i_nlink--; 763 } 764 765 /* 766 * Rename system call. 767 * rename("foo", "bar"); 768 * is essentially 769 * unlink("bar"); 770 * link("foo", "bar"); 771 * unlink("foo"); 772 * but ``atomically''. Can't do full commit without saving state in the 773 * inode on disk which isn't feasible at this time. Best we can do is 774 * always guarantee the target exists. 775 * 776 * Basic algorithm is: 777 * 778 * 1) Bump link count on source while we're linking it to the 779 * target. This also ensure the inode won't be deleted out 780 * from underneath us while we work (it may be truncated by 781 * a concurrent `trunc' or `open' for creation). 782 * 2) Link source to destination. If destination already exists, 783 * delete it first. 784 * 3) Unlink source reference to inode if still around. If a 785 * directory was moved and the parent of the destination 786 * is different from the source, patch the ".." entry in the 787 * directory. 788 */ 789 static int 790 ext2_rename(struct vop_rename_args *ap) 791 { 792 struct vnode *tvp = ap->a_tvp; 793 struct vnode *tdvp = ap->a_tdvp; 794 struct vnode *fvp = ap->a_fvp; 795 struct vnode *fdvp = ap->a_fdvp; 796 struct componentname *tcnp = ap->a_tcnp; 797 struct componentname *fcnp = ap->a_fcnp; 798 struct inode *ip, *xp, *dp; 799 struct dirtemplate *dirbuf; 800 int doingdirectory = 0, oldparent = 0, newparent = 0; 801 int error = 0; 802 u_char namlen; 803 804 #ifdef INVARIANTS 805 if ((tcnp->cn_flags & HASBUF) == 0 || 806 (fcnp->cn_flags & HASBUF) == 0) 807 panic("ext2_rename: no name"); 808 #endif 809 /* 810 * Check for cross-device rename. 811 */ 812 if ((fvp->v_mount != tdvp->v_mount) || 813 (tvp && (fvp->v_mount != tvp->v_mount))) { 814 error = EXDEV; 815 abortit: 816 if (tdvp == tvp) 817 vrele(tdvp); 818 else 819 vput(tdvp); 820 if (tvp) 821 vput(tvp); 822 vrele(fdvp); 823 vrele(fvp); 824 return (error); 825 } 826 827 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 828 (VTOI(tdvp)->i_flags & APPEND))) { 829 error = EPERM; 830 goto abortit; 831 } 832 833 /* 834 * Renaming a file to itself has no effect. The upper layers should 835 * not call us in that case. Temporarily just warn if they do. 836 */ 837 if (fvp == tvp) { 838 SDT_PROBE2(ext2fs, , vnops, trace, 1, 839 "rename: fvp == tvp (can't happen)"); 840 error = 0; 841 goto abortit; 842 } 843 844 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 845 goto abortit; 846 dp = VTOI(fdvp); 847 ip = VTOI(fvp); 848 if (ip->i_nlink >= EXT4_LINK_MAX && 849 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 850 VOP_UNLOCK(fvp); 851 error = EMLINK; 852 goto abortit; 853 } 854 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 855 || (dp->i_flags & APPEND)) { 856 VOP_UNLOCK(fvp); 857 error = EPERM; 858 goto abortit; 859 } 860 if ((ip->i_mode & IFMT) == IFDIR) { 861 /* 862 * Avoid ".", "..", and aliases of "." for obvious reasons. 863 */ 864 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 865 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 866 (ip->i_flag & IN_RENAME)) { 867 VOP_UNLOCK(fvp); 868 error = EINVAL; 869 goto abortit; 870 } 871 ip->i_flag |= IN_RENAME; 872 oldparent = dp->i_number; 873 doingdirectory++; 874 } 875 vrele(fdvp); 876 877 /* 878 * When the target exists, both the directory 879 * and target vnodes are returned locked. 880 */ 881 dp = VTOI(tdvp); 882 xp = NULL; 883 if (tvp) 884 xp = VTOI(tvp); 885 886 /* 887 * 1) Bump link count while we're moving stuff 888 * around. If we crash somewhere before 889 * completing our work, the link count 890 * may be wrong, but correctable. 891 */ 892 ext2_inc_nlink(ip); 893 ip->i_flag |= IN_CHANGE; 894 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 895 VOP_UNLOCK(fvp); 896 goto bad; 897 } 898 899 /* 900 * If ".." must be changed (ie the directory gets a new 901 * parent) then the source directory must not be in the 902 * directory hierarchy above the target, as this would 903 * orphan everything below the source directory. Also 904 * the user must have write permission in the source so 905 * as to be able to change "..". We must repeat the call 906 * to namei, as the parent directory is unlocked by the 907 * call to checkpath(). 908 */ 909 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread); 910 VOP_UNLOCK(fvp); 911 if (oldparent != dp->i_number) 912 newparent = dp->i_number; 913 if (doingdirectory && newparent) { 914 if (error) /* write access check above */ 915 goto bad; 916 if (xp != NULL) 917 vput(tvp); 918 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 919 if (error) 920 goto out; 921 VREF(tdvp); 922 error = vfs_relookup(tdvp, &tvp, tcnp); 923 if (error) 924 goto out; 925 vrele(tdvp); 926 dp = VTOI(tdvp); 927 xp = NULL; 928 if (tvp) 929 xp = VTOI(tvp); 930 } 931 /* 932 * 2) If target doesn't exist, link the target 933 * to the source and unlink the source. 934 * Otherwise, rewrite the target directory 935 * entry to reference the source inode and 936 * expunge the original entry's existence. 937 */ 938 if (xp == NULL) { 939 if (dp->i_devvp != ip->i_devvp) 940 panic("ext2_rename: EXDEV"); 941 /* 942 * Account for ".." in new directory. 943 * When source and destination have the same 944 * parent we don't fool with the link count. 945 */ 946 if (doingdirectory && newparent) { 947 error = ext2_inc_nlink(dp); 948 if (error) 949 goto bad; 950 951 dp->i_flag |= IN_CHANGE; 952 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 953 if (error) 954 goto bad; 955 } 956 error = ext2_direnter(ip, tdvp, tcnp); 957 if (error) { 958 if (doingdirectory && newparent) { 959 ext2_dec_nlink(dp); 960 dp->i_flag |= IN_CHANGE; 961 (void)ext2_update(tdvp, 1); 962 } 963 goto bad; 964 } 965 vput(tdvp); 966 } else { 967 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 968 panic("ext2_rename: EXDEV"); 969 /* 970 * Short circuit rename(foo, foo). 971 */ 972 if (xp->i_number == ip->i_number) 973 panic("ext2_rename: same file"); 974 /* 975 * If the parent directory is "sticky", then the user must 976 * own the parent directory, or the destination of the rename, 977 * otherwise the destination may not be changed (except by 978 * root). This implements append-only directories. 979 */ 980 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 981 tcnp->cn_cred->cr_uid != dp->i_uid && 982 xp->i_uid != tcnp->cn_cred->cr_uid) { 983 error = EPERM; 984 goto bad; 985 } 986 /* 987 * Target must be empty if a directory and have no links 988 * to it. Also, ensure source and target are compatible 989 * (both directories, or both not directories). 990 */ 991 if ((xp->i_mode & IFMT) == IFDIR) { 992 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 993 error = ENOTEMPTY; 994 goto bad; 995 } 996 if (!doingdirectory) { 997 error = ENOTDIR; 998 goto bad; 999 } 1000 cache_purge(tdvp); 1001 } else if (doingdirectory) { 1002 error = EISDIR; 1003 goto bad; 1004 } 1005 error = ext2_dirrewrite(dp, ip, tcnp); 1006 if (error) 1007 goto bad; 1008 /* 1009 * If the target directory is in the same 1010 * directory as the source directory, 1011 * decrement the link count on the parent 1012 * of the target directory. 1013 */ 1014 if (doingdirectory && !newparent) { 1015 ext2_dec_nlink(dp); 1016 dp->i_flag |= IN_CHANGE; 1017 } 1018 vput(tdvp); 1019 /* 1020 * Adjust the link count of the target to 1021 * reflect the dirrewrite above. If this is 1022 * a directory it is empty and there are 1023 * no links to it, so we can squash the inode and 1024 * any space associated with it. We disallowed 1025 * renaming over top of a directory with links to 1026 * it above, as the remaining link would point to 1027 * a directory without "." or ".." entries. 1028 */ 1029 ext2_dec_nlink(xp); 1030 if (doingdirectory) { 1031 if (xp->i_nlink > 2) 1032 panic("ext2_rename: linked directory"); 1033 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1034 tcnp->cn_cred, curthread); 1035 xp->i_nlink = 0; 1036 } 1037 xp->i_flag |= IN_CHANGE; 1038 vput(tvp); 1039 xp = NULL; 1040 } 1041 1042 /* 1043 * 3) Unlink the source. 1044 */ 1045 fcnp->cn_flags &= ~MODMASK; 1046 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1047 VREF(fdvp); 1048 error = vfs_relookup(fdvp, &fvp, fcnp); 1049 if (error == 0) 1050 vrele(fdvp); 1051 if (fvp != NULL) { 1052 xp = VTOI(fvp); 1053 dp = VTOI(fdvp); 1054 } else { 1055 /* 1056 * From name has disappeared. IN_RENAME is not sufficient 1057 * to protect against directory races due to timing windows, 1058 * so we can't panic here. 1059 */ 1060 vrele(ap->a_fvp); 1061 return (0); 1062 } 1063 /* 1064 * Ensure that the directory entry still exists and has not 1065 * changed while the new name has been entered. If the source is 1066 * a file then the entry may have been unlinked or renamed. In 1067 * either case there is no further work to be done. If the source 1068 * is a directory then it cannot have been rmdir'ed; its link 1069 * count of three would cause a rmdir to fail with ENOTEMPTY. 1070 * The IN_RENAME flag ensures that it cannot be moved by another 1071 * rename. 1072 */ 1073 if (xp != ip) { 1074 /* 1075 * From name resolves to a different inode. IN_RENAME is 1076 * not sufficient protection against timing window races 1077 * so we can't panic here. 1078 */ 1079 } else { 1080 /* 1081 * If the source is a directory with a 1082 * new parent, the link count of the old 1083 * parent directory must be decremented 1084 * and ".." set to point to the new parent. 1085 */ 1086 if (doingdirectory && newparent) { 1087 ext2_dec_nlink(dp); 1088 dp->i_flag |= IN_CHANGE; 1089 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1090 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1091 ip->i_e2fs->e2fs_bsize, (off_t)0, 1092 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1093 tcnp->cn_cred, NOCRED, NULL, NULL); 1094 if (error == 0) { 1095 /* Like ufs little-endian: */ 1096 namlen = dirbuf->dotdot_type; 1097 if (namlen != 2 || 1098 dirbuf->dotdot_name[0] != '.' || 1099 dirbuf->dotdot_name[1] != '.') { 1100 ext2_dirbad(xp, (doff_t)12, 1101 "rename: mangled dir"); 1102 } else { 1103 dirbuf->dotdot_ino = htole32(newparent); 1104 /* 1105 * dirblock 0 could be htree root, 1106 * try both csum update functions. 1107 */ 1108 ext2_dirent_csum_set(ip, 1109 (struct ext2fs_direct_2 *)dirbuf); 1110 ext2_dx_csum_set(ip, 1111 (struct ext2fs_direct_2 *)dirbuf); 1112 (void)vn_rdwr(UIO_WRITE, fvp, 1113 (caddr_t)dirbuf, 1114 ip->i_e2fs->e2fs_bsize, 1115 (off_t)0, UIO_SYSSPACE, 1116 IO_NODELOCKED | IO_SYNC | 1117 IO_NOMACCHECK, tcnp->cn_cred, 1118 NOCRED, NULL, NULL); 1119 cache_purge(fdvp); 1120 } 1121 } 1122 free(dirbuf, M_TEMP); 1123 } 1124 error = ext2_dirremove(fdvp, fcnp); 1125 if (!error) { 1126 ext2_dec_nlink(xp); 1127 xp->i_flag |= IN_CHANGE; 1128 } 1129 xp->i_flag &= ~IN_RENAME; 1130 } 1131 if (dp) 1132 vput(fdvp); 1133 if (xp) 1134 vput(fvp); 1135 vrele(ap->a_fvp); 1136 return (error); 1137 1138 bad: 1139 if (xp) 1140 vput(ITOV(xp)); 1141 vput(ITOV(dp)); 1142 out: 1143 if (doingdirectory) 1144 ip->i_flag &= ~IN_RENAME; 1145 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1146 ext2_dec_nlink(ip); 1147 ip->i_flag |= IN_CHANGE; 1148 ip->i_flag &= ~IN_RENAME; 1149 vput(fvp); 1150 } else 1151 vrele(fvp); 1152 return (error); 1153 } 1154 1155 #ifdef UFS_ACL 1156 static int 1157 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1158 mode_t dmode, struct ucred *cred, struct thread *td) 1159 { 1160 int error; 1161 struct inode *ip = VTOI(tvp); 1162 struct acl *dacl, *acl; 1163 1164 acl = acl_alloc(M_WAITOK); 1165 dacl = acl_alloc(M_WAITOK); 1166 1167 /* 1168 * Retrieve default ACL from parent, if any. 1169 */ 1170 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1171 switch (error) { 1172 case 0: 1173 /* 1174 * Retrieved a default ACL, so merge mode and ACL if 1175 * necessary. If the ACL is empty, fall through to 1176 * the "not defined or available" case. 1177 */ 1178 if (acl->acl_cnt != 0) { 1179 dmode = acl_posix1e_newfilemode(dmode, acl); 1180 ip->i_mode = dmode; 1181 *dacl = *acl; 1182 ext2_sync_acl_from_inode(ip, acl); 1183 break; 1184 } 1185 /* FALLTHROUGH */ 1186 1187 case EOPNOTSUPP: 1188 /* 1189 * Just use the mode as-is. 1190 */ 1191 ip->i_mode = dmode; 1192 error = 0; 1193 goto out; 1194 1195 default: 1196 goto out; 1197 } 1198 1199 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1200 if (error == 0) 1201 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1202 switch (error) { 1203 case 0: 1204 break; 1205 1206 case EOPNOTSUPP: 1207 /* 1208 * XXX: This should not happen, as EOPNOTSUPP above 1209 * was supposed to free acl. 1210 */ 1211 #ifdef DEBUG 1212 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1213 #endif /* DEBUG */ 1214 break; 1215 1216 default: 1217 goto out; 1218 } 1219 1220 out: 1221 acl_free(acl); 1222 acl_free(dacl); 1223 1224 return (error); 1225 } 1226 1227 static int 1228 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1229 mode_t mode, struct ucred *cred, struct thread *td) 1230 { 1231 int error; 1232 struct inode *ip = VTOI(tvp); 1233 struct acl *acl; 1234 1235 acl = acl_alloc(M_WAITOK); 1236 1237 /* 1238 * Retrieve default ACL for parent, if any. 1239 */ 1240 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1241 switch (error) { 1242 case 0: 1243 /* 1244 * Retrieved a default ACL, so merge mode and ACL if 1245 * necessary. 1246 */ 1247 if (acl->acl_cnt != 0) { 1248 /* 1249 * Two possible ways for default ACL to not 1250 * be present. First, the EA can be 1251 * undefined, or second, the default ACL can 1252 * be blank. If it's blank, fall through to 1253 * the it's not defined case. 1254 */ 1255 mode = acl_posix1e_newfilemode(mode, acl); 1256 ip->i_mode = mode; 1257 ext2_sync_acl_from_inode(ip, acl); 1258 break; 1259 } 1260 /* FALLTHROUGH */ 1261 1262 case EOPNOTSUPP: 1263 /* 1264 * Just use the mode as-is. 1265 */ 1266 ip->i_mode = mode; 1267 error = 0; 1268 goto out; 1269 1270 default: 1271 goto out; 1272 } 1273 1274 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1275 switch (error) { 1276 case 0: 1277 break; 1278 1279 case EOPNOTSUPP: 1280 /* 1281 * XXX: This should not happen, as EOPNOTSUPP above was 1282 * supposed to free acl. 1283 */ 1284 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1285 "but no VOP_SETACL()\n"); 1286 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1287 "but no VOP_SETACL()"); */ 1288 break; 1289 1290 default: 1291 goto out; 1292 } 1293 1294 out: 1295 acl_free(acl); 1296 1297 return (error); 1298 } 1299 1300 #endif /* UFS_ACL */ 1301 1302 /* 1303 * Mkdir system call 1304 */ 1305 static int 1306 ext2_mkdir(struct vop_mkdir_args *ap) 1307 { 1308 struct m_ext2fs *fs; 1309 struct vnode *dvp = ap->a_dvp; 1310 struct vattr *vap = ap->a_vap; 1311 struct componentname *cnp = ap->a_cnp; 1312 struct inode *ip, *dp; 1313 struct vnode *tvp; 1314 struct dirtemplate dirtemplate, *dtp; 1315 char *buf = NULL; 1316 int error, dmode; 1317 1318 #ifdef INVARIANTS 1319 if ((cnp->cn_flags & HASBUF) == 0) 1320 panic("ext2_mkdir: no name"); 1321 #endif 1322 dp = VTOI(dvp); 1323 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1324 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1325 error = EMLINK; 1326 goto out; 1327 } 1328 dmode = vap->va_mode & 0777; 1329 dmode |= IFDIR; 1330 /* 1331 * Must simulate part of ext2_makeinode here to acquire the inode, 1332 * but not have it entered in the parent directory. The entry is 1333 * made later after writing "." and ".." entries. 1334 */ 1335 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1336 if (error) 1337 goto out; 1338 ip = VTOI(tvp); 1339 fs = ip->i_e2fs; 1340 ip->i_gid = dp->i_gid; 1341 #ifdef SUIDDIR 1342 { 1343 /* 1344 * if we are hacking owners here, (only do this where told to) 1345 * and we are not giving it TOO root, (would subvert quotas) 1346 * then go ahead and give it to the other user. 1347 * The new directory also inherits the SUID bit. 1348 * If user's UID and dir UID are the same, 1349 * 'give it away' so that the SUID is still forced on. 1350 */ 1351 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1352 (dp->i_mode & ISUID) && dp->i_uid) { 1353 dmode |= ISUID; 1354 ip->i_uid = dp->i_uid; 1355 } else { 1356 ip->i_uid = cnp->cn_cred->cr_uid; 1357 } 1358 } 1359 #else 1360 ip->i_uid = cnp->cn_cred->cr_uid; 1361 #endif 1362 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1363 ip->i_mode = dmode; 1364 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1365 ip->i_nlink = 2; 1366 if (cnp->cn_flags & ISWHITEOUT) 1367 ip->i_flags |= UF_OPAQUE; 1368 error = ext2_update(tvp, 1); 1369 1370 /* 1371 * Bump link count in parent directory 1372 * to reflect work done below. Should 1373 * be done before reference is created 1374 * so reparation is possible if we crash. 1375 */ 1376 ext2_inc_nlink(dp); 1377 dp->i_flag |= IN_CHANGE; 1378 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1379 if (error) 1380 goto bad; 1381 1382 /* Initialize directory with "." and ".." from static template. */ 1383 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1384 EXT2F_INCOMPAT_FTYPE)) 1385 dtp = &mastertemplate; 1386 else 1387 dtp = &omastertemplate; 1388 dirtemplate = *dtp; 1389 dirtemplate.dot_ino = htole32(ip->i_number); 1390 dirtemplate.dotdot_ino = htole32(dp->i_number); 1391 /* 1392 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1393 * just redefine it - for this function only 1394 */ 1395 #undef DIRBLKSIZ 1396 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1397 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12); 1398 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1399 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1400 dirtemplate.dotdot_reclen = 1401 htole16(le16toh(dirtemplate.dotdot_reclen) - 1402 sizeof(struct ext2fs_direct_tail)); 1403 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1404 } 1405 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1406 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1407 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1408 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1409 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1410 NULL, NULL); 1411 if (error) { 1412 ext2_dec_nlink(dp); 1413 dp->i_flag |= IN_CHANGE; 1414 goto bad; 1415 } 1416 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1417 /* XXX should grow with balloc() */ 1418 panic("ext2_mkdir: blksize"); 1419 else { 1420 ip->i_size = DIRBLKSIZ; 1421 ip->i_flag |= IN_CHANGE; 1422 } 1423 1424 #ifdef UFS_ACL 1425 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1426 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1427 cnp->cn_cred, curthread); 1428 if (error) 1429 goto bad; 1430 } 1431 1432 #endif /* UFS_ACL */ 1433 1434 /* Directory set up, now install its entry in the parent directory. */ 1435 error = ext2_direnter(ip, dvp, cnp); 1436 if (error) { 1437 ext2_dec_nlink(dp); 1438 dp->i_flag |= IN_CHANGE; 1439 } 1440 bad: 1441 /* 1442 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1443 * for us because we set the link count to 0. 1444 */ 1445 if (error) { 1446 ip->i_nlink = 0; 1447 ip->i_flag |= IN_CHANGE; 1448 vput(tvp); 1449 } else 1450 *ap->a_vpp = tvp; 1451 out: 1452 free(buf, M_TEMP); 1453 return (error); 1454 #undef DIRBLKSIZ 1455 #define DIRBLKSIZ DEV_BSIZE 1456 } 1457 1458 /* 1459 * Rmdir system call. 1460 */ 1461 static int 1462 ext2_rmdir(struct vop_rmdir_args *ap) 1463 { 1464 struct vnode *vp = ap->a_vp; 1465 struct vnode *dvp = ap->a_dvp; 1466 struct componentname *cnp = ap->a_cnp; 1467 struct inode *ip, *dp; 1468 int error; 1469 1470 ip = VTOI(vp); 1471 dp = VTOI(dvp); 1472 1473 /* 1474 * Verify the directory is empty (and valid). 1475 * (Rmdir ".." won't be valid since 1476 * ".." will contain a reference to 1477 * the current directory and thus be 1478 * non-empty.) 1479 */ 1480 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1481 error = ENOTEMPTY; 1482 goto out; 1483 } 1484 if ((dp->i_flags & APPEND) 1485 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1486 error = EPERM; 1487 goto out; 1488 } 1489 /* 1490 * Delete reference to directory before purging 1491 * inode. If we crash in between, the directory 1492 * will be reattached to lost+found, 1493 */ 1494 error = ext2_dirremove(dvp, cnp); 1495 if (error) 1496 goto out; 1497 ext2_dec_nlink(dp); 1498 dp->i_flag |= IN_CHANGE; 1499 cache_purge(dvp); 1500 VOP_UNLOCK(dvp); 1501 /* 1502 * Truncate inode. The only stuff left 1503 * in the directory is "." and "..". 1504 */ 1505 ip->i_nlink = 0; 1506 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1507 curthread); 1508 cache_purge(ITOV(ip)); 1509 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1510 VOP_UNLOCK(vp); 1511 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1512 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1513 } 1514 out: 1515 return (error); 1516 } 1517 1518 /* 1519 * symlink -- make a symbolic link 1520 */ 1521 static int 1522 ext2_symlink(struct vop_symlink_args *ap) 1523 { 1524 struct vnode *vp, **vpp = ap->a_vpp; 1525 struct inode *ip; 1526 int len, error; 1527 1528 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1529 vpp, ap->a_cnp); 1530 if (error) 1531 return (error); 1532 vp = *vpp; 1533 len = strlen(ap->a_target); 1534 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1535 ip = VTOI(vp); 1536 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1537 ip->i_size = len; 1538 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1539 } else 1540 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1541 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1542 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1543 if (error) 1544 vput(vp); 1545 return (error); 1546 } 1547 1548 /* 1549 * Return target name of a symbolic link 1550 */ 1551 static int 1552 ext2_readlink(struct vop_readlink_args *ap) 1553 { 1554 struct vnode *vp = ap->a_vp; 1555 struct inode *ip = VTOI(vp); 1556 int isize; 1557 1558 isize = ip->i_size; 1559 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1560 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1561 return (0); 1562 } 1563 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1564 } 1565 1566 /* 1567 * Calculate the logical to physical mapping if not done already, 1568 * then call the device strategy routine. 1569 * 1570 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1571 * deadlock on memory. See ext2_bmap() for details. 1572 */ 1573 static int 1574 ext2_strategy(struct vop_strategy_args *ap) 1575 { 1576 struct buf *bp = ap->a_bp; 1577 struct vnode *vp = ap->a_vp; 1578 struct bufobj *bo; 1579 daddr_t blkno; 1580 int error; 1581 1582 if (vp->v_type == VBLK || vp->v_type == VCHR) 1583 panic("ext2_strategy: spec"); 1584 if (bp->b_blkno == bp->b_lblkno) { 1585 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1586 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1587 else 1588 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1589 1590 bp->b_blkno = blkno; 1591 if (error) { 1592 bp->b_error = error; 1593 bp->b_ioflags |= BIO_ERROR; 1594 bufdone(bp); 1595 return (0); 1596 } 1597 if ((long)bp->b_blkno == -1) 1598 vfs_bio_clrbuf(bp); 1599 } 1600 if ((long)bp->b_blkno == -1) { 1601 bufdone(bp); 1602 return (0); 1603 } 1604 bp->b_iooffset = dbtob(bp->b_blkno); 1605 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1606 BO_STRATEGY(bo, bp); 1607 return (0); 1608 } 1609 1610 /* 1611 * Print out the contents of an inode. 1612 */ 1613 static int 1614 ext2_print(struct vop_print_args *ap) 1615 { 1616 struct vnode *vp = ap->a_vp; 1617 struct inode *ip = VTOI(vp); 1618 1619 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1620 if (vp->v_type == VFIFO) 1621 fifo_printinfo(vp); 1622 printf("\n"); 1623 return (0); 1624 } 1625 1626 /* 1627 * Close wrapper for fifos. 1628 * 1629 * Update the times on the inode then do device close. 1630 */ 1631 static int 1632 ext2fifo_close(struct vop_close_args *ap) 1633 { 1634 struct vnode *vp = ap->a_vp; 1635 1636 VI_LOCK(vp); 1637 if (vp->v_usecount > 1) 1638 ext2_itimes_locked(vp); 1639 VI_UNLOCK(vp); 1640 return (fifo_specops.vop_close(ap)); 1641 } 1642 1643 /* 1644 * Return POSIX pathconf information applicable to ext2 filesystems. 1645 */ 1646 static int 1647 ext2_pathconf(struct vop_pathconf_args *ap) 1648 { 1649 int error = 0; 1650 1651 switch (ap->a_name) { 1652 case _PC_LINK_MAX: 1653 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1654 EXT2F_ROCOMPAT_DIR_NLINK)) 1655 *ap->a_retval = INT_MAX; 1656 else 1657 *ap->a_retval = EXT4_LINK_MAX; 1658 break; 1659 case _PC_NAME_MAX: 1660 *ap->a_retval = NAME_MAX; 1661 break; 1662 case _PC_PIPE_BUF: 1663 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1664 *ap->a_retval = PIPE_BUF; 1665 else 1666 error = EINVAL; 1667 break; 1668 case _PC_CHOWN_RESTRICTED: 1669 *ap->a_retval = 1; 1670 break; 1671 case _PC_NO_TRUNC: 1672 *ap->a_retval = 1; 1673 break; 1674 1675 #ifdef UFS_ACL 1676 case _PC_ACL_EXTENDED: 1677 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1678 *ap->a_retval = 1; 1679 else 1680 *ap->a_retval = 0; 1681 break; 1682 case _PC_ACL_PATH_MAX: 1683 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1684 *ap->a_retval = ACL_MAX_ENTRIES; 1685 else 1686 *ap->a_retval = 3; 1687 break; 1688 #endif /* UFS_ACL */ 1689 1690 case _PC_MIN_HOLE_SIZE: 1691 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1692 break; 1693 case _PC_PRIO_IO: 1694 *ap->a_retval = 0; 1695 break; 1696 case _PC_SYNC_IO: 1697 *ap->a_retval = 0; 1698 break; 1699 case _PC_ALLOC_SIZE_MIN: 1700 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1701 break; 1702 case _PC_FILESIZEBITS: 1703 *ap->a_retval = 64; 1704 break; 1705 case _PC_REC_INCR_XFER_SIZE: 1706 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1707 break; 1708 case _PC_REC_MAX_XFER_SIZE: 1709 *ap->a_retval = -1; /* means ``unlimited'' */ 1710 break; 1711 case _PC_REC_MIN_XFER_SIZE: 1712 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1713 break; 1714 case _PC_REC_XFER_ALIGN: 1715 *ap->a_retval = PAGE_SIZE; 1716 break; 1717 case _PC_SYMLINK_MAX: 1718 *ap->a_retval = MAXPATHLEN; 1719 break; 1720 1721 default: 1722 error = vop_stdpathconf(ap); 1723 break; 1724 } 1725 return (error); 1726 } 1727 1728 /* 1729 * Vnode operation to remove a named attribute. 1730 */ 1731 static int 1732 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1733 { 1734 struct inode *ip; 1735 struct m_ext2fs *fs; 1736 int error; 1737 1738 ip = VTOI(ap->a_vp); 1739 fs = ip->i_e2fs; 1740 1741 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1742 return (EOPNOTSUPP); 1743 1744 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1745 return (EOPNOTSUPP); 1746 1747 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1748 ap->a_cred, ap->a_td, VWRITE); 1749 if (error) 1750 return (error); 1751 1752 error = ENOATTR; 1753 1754 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1755 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1756 if (error != ENOATTR) 1757 return (error); 1758 } 1759 1760 if (ip->i_facl) 1761 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1762 1763 return (error); 1764 } 1765 1766 /* 1767 * Vnode operation to retrieve a named extended attribute. 1768 */ 1769 static int 1770 ext2_getextattr(struct vop_getextattr_args *ap) 1771 { 1772 struct inode *ip; 1773 struct m_ext2fs *fs; 1774 int error; 1775 1776 ip = VTOI(ap->a_vp); 1777 fs = ip->i_e2fs; 1778 1779 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1780 return (EOPNOTSUPP); 1781 1782 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1783 return (EOPNOTSUPP); 1784 1785 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1786 ap->a_cred, ap->a_td, VREAD); 1787 if (error) 1788 return (error); 1789 1790 if (ap->a_size != NULL) 1791 *ap->a_size = 0; 1792 1793 error = ENOATTR; 1794 1795 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1796 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1797 ap->a_name, ap->a_uio, ap->a_size); 1798 if (error != ENOATTR) 1799 return (error); 1800 } 1801 1802 if (ip->i_facl) 1803 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1804 ap->a_name, ap->a_uio, ap->a_size); 1805 1806 return (error); 1807 } 1808 1809 /* 1810 * Vnode operation to retrieve extended attributes on a vnode. 1811 */ 1812 static int 1813 ext2_listextattr(struct vop_listextattr_args *ap) 1814 { 1815 struct inode *ip; 1816 struct m_ext2fs *fs; 1817 int error; 1818 1819 ip = VTOI(ap->a_vp); 1820 fs = ip->i_e2fs; 1821 1822 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1823 return (EOPNOTSUPP); 1824 1825 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1826 return (EOPNOTSUPP); 1827 1828 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1829 ap->a_cred, ap->a_td, VREAD); 1830 if (error) 1831 return (error); 1832 1833 if (ap->a_size != NULL) 1834 *ap->a_size = 0; 1835 1836 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1837 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1838 ap->a_uio, ap->a_size); 1839 if (error) 1840 return (error); 1841 } 1842 1843 if (ip->i_facl) 1844 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1845 ap->a_uio, ap->a_size); 1846 1847 return (error); 1848 } 1849 1850 /* 1851 * Vnode operation to set a named attribute. 1852 */ 1853 static int 1854 ext2_setextattr(struct vop_setextattr_args *ap) 1855 { 1856 struct inode *ip; 1857 struct m_ext2fs *fs; 1858 int error; 1859 1860 ip = VTOI(ap->a_vp); 1861 fs = ip->i_e2fs; 1862 1863 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1864 return (EOPNOTSUPP); 1865 1866 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1867 return (EOPNOTSUPP); 1868 1869 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1870 ap->a_cred, ap->a_td, VWRITE); 1871 if (error) 1872 return (error); 1873 1874 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1875 if (error) 1876 return (error); 1877 1878 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1879 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1880 ap->a_name, ap->a_uio); 1881 if (error != ENOSPC) 1882 return (error); 1883 } 1884 1885 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1886 ap->a_name, ap->a_uio); 1887 1888 return (error); 1889 } 1890 1891 /* 1892 * Vnode pointer to File handle 1893 */ 1894 /* ARGSUSED */ 1895 static int 1896 ext2_vptofh(struct vop_vptofh_args *ap) 1897 { 1898 struct inode *ip; 1899 struct ufid *ufhp; 1900 1901 ip = VTOI(ap->a_vp); 1902 ufhp = (struct ufid *)ap->a_fhp; 1903 ufhp->ufid_len = sizeof(struct ufid); 1904 ufhp->ufid_ino = ip->i_number; 1905 ufhp->ufid_gen = ip->i_gen; 1906 return (0); 1907 } 1908 1909 /* 1910 * Initialize the vnode associated with a new inode, handle aliased 1911 * vnodes. 1912 */ 1913 int 1914 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1915 { 1916 struct inode *ip; 1917 struct vnode *vp; 1918 1919 vp = *vpp; 1920 ip = VTOI(vp); 1921 vp->v_type = IFTOVT(ip->i_mode); 1922 /* 1923 * Only unallocated inodes should be of type VNON. 1924 */ 1925 if (ip->i_mode != 0 && vp->v_type == VNON) 1926 return (EINVAL); 1927 if (vp->v_type == VFIFO) 1928 vp->v_op = fifoops; 1929 1930 if (ip->i_number == EXT2_ROOTINO) 1931 vp->v_vflag |= VV_ROOT; 1932 ip->i_modrev = init_va_filerev(); 1933 *vpp = vp; 1934 return (0); 1935 } 1936 1937 /* 1938 * Allocate a new inode. 1939 */ 1940 static int 1941 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1942 struct componentname *cnp) 1943 { 1944 struct inode *ip, *pdir; 1945 struct vnode *tvp; 1946 int error; 1947 1948 pdir = VTOI(dvp); 1949 #ifdef INVARIANTS 1950 if ((cnp->cn_flags & HASBUF) == 0) 1951 panic("ext2_makeinode: no name"); 1952 #endif 1953 *vpp = NULL; 1954 if ((mode & IFMT) == 0) 1955 mode |= IFREG; 1956 1957 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1958 if (error) { 1959 return (error); 1960 } 1961 ip = VTOI(tvp); 1962 ip->i_gid = pdir->i_gid; 1963 #ifdef SUIDDIR 1964 { 1965 /* 1966 * if we are 1967 * not the owner of the directory, 1968 * and we are hacking owners here, (only do this where told to) 1969 * and we are not giving it TOO root, (would subvert quotas) 1970 * then go ahead and give it to the other user. 1971 * Note that this drops off the execute bits for security. 1972 */ 1973 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1974 (pdir->i_mode & ISUID) && 1975 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1976 ip->i_uid = pdir->i_uid; 1977 mode &= ~07111; 1978 } else { 1979 ip->i_uid = cnp->cn_cred->cr_uid; 1980 } 1981 } 1982 #else 1983 ip->i_uid = cnp->cn_cred->cr_uid; 1984 #endif 1985 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1986 ip->i_mode = mode; 1987 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1988 ip->i_nlink = 1; 1989 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1990 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 1991 ip->i_mode &= ~ISGID; 1992 } 1993 1994 if (cnp->cn_flags & ISWHITEOUT) 1995 ip->i_flags |= UF_OPAQUE; 1996 1997 /* 1998 * Make sure inode goes to disk before directory entry. 1999 */ 2000 error = ext2_update(tvp, !DOINGASYNC(tvp)); 2001 if (error) 2002 goto bad; 2003 2004 #ifdef UFS_ACL 2005 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 2006 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 2007 cnp->cn_cred, curthread); 2008 if (error) 2009 goto bad; 2010 } 2011 #endif /* UFS_ACL */ 2012 2013 error = ext2_direnter(ip, dvp, cnp); 2014 if (error) 2015 goto bad; 2016 2017 *vpp = tvp; 2018 return (0); 2019 2020 bad: 2021 /* 2022 * Write error occurred trying to update the inode 2023 * or the directory so must deallocate the inode. 2024 */ 2025 ip->i_nlink = 0; 2026 ip->i_flag |= IN_CHANGE; 2027 vput(tvp); 2028 return (error); 2029 } 2030 2031 /* 2032 * Vnode op for reading. 2033 */ 2034 static int 2035 ext2_read(struct vop_read_args *ap) 2036 { 2037 struct vnode *vp; 2038 struct inode *ip; 2039 struct uio *uio; 2040 struct m_ext2fs *fs; 2041 struct buf *bp; 2042 daddr_t lbn, nextlbn; 2043 off_t bytesinfile; 2044 long size, xfersize, blkoffset; 2045 int error, orig_resid, seqcount; 2046 int ioflag; 2047 2048 vp = ap->a_vp; 2049 uio = ap->a_uio; 2050 ioflag = ap->a_ioflag; 2051 2052 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2053 ip = VTOI(vp); 2054 2055 #ifdef INVARIANTS 2056 if (uio->uio_rw != UIO_READ) 2057 panic("%s: mode", "ext2_read"); 2058 2059 if (vp->v_type == VLNK) { 2060 if ((int)ip->i_size < 2061 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) 2062 panic("%s: short symlink", "ext2_read"); 2063 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2064 panic("%s: type %d", "ext2_read", vp->v_type); 2065 #endif 2066 orig_resid = uio->uio_resid; 2067 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2068 if (orig_resid == 0) 2069 return (0); 2070 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2071 fs = ip->i_e2fs; 2072 if (uio->uio_offset < ip->i_size && 2073 uio->uio_offset >= fs->e2fs_maxfilesize) 2074 return (EOVERFLOW); 2075 2076 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2077 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2078 break; 2079 lbn = lblkno(fs, uio->uio_offset); 2080 nextlbn = lbn + 1; 2081 size = blksize(fs, ip, lbn); 2082 blkoffset = blkoff(fs, uio->uio_offset); 2083 2084 xfersize = fs->e2fs_fsize - blkoffset; 2085 if (uio->uio_resid < xfersize) 2086 xfersize = uio->uio_resid; 2087 if (bytesinfile < xfersize) 2088 xfersize = bytesinfile; 2089 2090 if (lblktosize(fs, nextlbn) >= ip->i_size) 2091 error = bread(vp, lbn, size, NOCRED, &bp); 2092 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2093 error = cluster_read(vp, ip->i_size, lbn, size, 2094 NOCRED, blkoffset + uio->uio_resid, seqcount, 2095 0, &bp); 2096 } else if (seqcount > 1) { 2097 u_int nextsize = blksize(fs, ip, nextlbn); 2098 2099 error = breadn(vp, lbn, 2100 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2101 } else 2102 error = bread(vp, lbn, size, NOCRED, &bp); 2103 if (error) { 2104 brelse(bp); 2105 bp = NULL; 2106 break; 2107 } 2108 2109 /* 2110 * We should only get non-zero b_resid when an I/O error 2111 * has occurred, which should cause us to break above. 2112 * However, if the short read did not cause an error, 2113 * then we want to ensure that we do not uiomove bad 2114 * or uninitialized data. 2115 */ 2116 size -= bp->b_resid; 2117 if (size < xfersize) { 2118 if (size == 0) 2119 break; 2120 xfersize = size; 2121 } 2122 error = uiomove((char *)bp->b_data + blkoffset, 2123 (int)xfersize, uio); 2124 if (error) 2125 break; 2126 vfs_bio_brelse(bp, ioflag); 2127 } 2128 2129 /* 2130 * This can only happen in the case of an error because the loop 2131 * above resets bp to NULL on each iteration and on normal 2132 * completion has not set a new value into it. so it must have come 2133 * from a 'break' statement 2134 */ 2135 if (bp != NULL) 2136 vfs_bio_brelse(bp, ioflag); 2137 2138 if ((error == 0 || uio->uio_resid != orig_resid) && 2139 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2140 ip->i_flag |= IN_ACCESS; 2141 return (error); 2142 } 2143 2144 static int 2145 ext2_ioctl(struct vop_ioctl_args *ap) 2146 { 2147 struct vnode *vp; 2148 int error; 2149 2150 vp = ap->a_vp; 2151 switch (ap->a_command) { 2152 case FIOSEEKDATA: 2153 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) { 2154 error = vn_lock(vp, LK_SHARED); 2155 if (error == 0) { 2156 error = ext2_bmap_seekdata(vp, 2157 (off_t *)ap->a_data); 2158 VOP_UNLOCK(vp); 2159 } else 2160 error = EBADF; 2161 return (error); 2162 } 2163 case FIOSEEKHOLE: 2164 return (vn_bmap_seekhole(vp, ap->a_command, 2165 (off_t *)ap->a_data, ap->a_cred)); 2166 default: 2167 return (ENOTTY); 2168 } 2169 } 2170 2171 /* 2172 * Vnode op for writing. 2173 */ 2174 static int 2175 ext2_write(struct vop_write_args *ap) 2176 { 2177 struct vnode *vp; 2178 struct uio *uio; 2179 struct inode *ip; 2180 struct m_ext2fs *fs; 2181 struct buf *bp; 2182 daddr_t lbn; 2183 off_t osize; 2184 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2185 2186 ioflag = ap->a_ioflag; 2187 uio = ap->a_uio; 2188 vp = ap->a_vp; 2189 2190 seqcount = ioflag >> IO_SEQSHIFT; 2191 ip = VTOI(vp); 2192 2193 #ifdef INVARIANTS 2194 if (uio->uio_rw != UIO_WRITE) 2195 panic("%s: mode", "ext2_write"); 2196 #endif 2197 2198 switch (vp->v_type) { 2199 case VREG: 2200 if (ioflag & IO_APPEND) 2201 uio->uio_offset = ip->i_size; 2202 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2203 return (EPERM); 2204 /* FALLTHROUGH */ 2205 case VLNK: 2206 break; 2207 case VDIR: 2208 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2209 if ((ioflag & IO_SYNC) == 0) 2210 panic("ext2_write: nonsync dir write"); 2211 break; 2212 default: 2213 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2214 vp->v_type, (intmax_t)uio->uio_offset, 2215 (intmax_t)uio->uio_resid); 2216 } 2217 2218 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2219 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2220 fs = ip->i_e2fs; 2221 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2222 return (EFBIG); 2223 /* 2224 * Maybe this should be above the vnode op call, but so long as 2225 * file servers have no limits, I don't think it matters. 2226 */ 2227 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 2228 return (EFBIG); 2229 2230 resid = uio->uio_resid; 2231 osize = ip->i_size; 2232 if (seqcount > BA_SEQMAX) 2233 flags = BA_SEQMAX << BA_SEQSHIFT; 2234 else 2235 flags = seqcount << BA_SEQSHIFT; 2236 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2237 flags |= IO_SYNC; 2238 2239 for (error = 0; uio->uio_resid > 0;) { 2240 lbn = lblkno(fs, uio->uio_offset); 2241 blkoffset = blkoff(fs, uio->uio_offset); 2242 xfersize = fs->e2fs_fsize - blkoffset; 2243 if (uio->uio_resid < xfersize) 2244 xfersize = uio->uio_resid; 2245 if (uio->uio_offset + xfersize > ip->i_size) 2246 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2247 2248 /* 2249 * We must perform a read-before-write if the transfer size 2250 * does not cover the entire buffer. 2251 */ 2252 if (fs->e2fs_bsize > xfersize) 2253 flags |= BA_CLRBUF; 2254 else 2255 flags &= ~BA_CLRBUF; 2256 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2257 ap->a_cred, &bp, flags); 2258 if (error != 0) 2259 break; 2260 2261 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2262 bp->b_flags |= B_NOCACHE; 2263 if (uio->uio_offset + xfersize > ip->i_size) 2264 ip->i_size = uio->uio_offset + xfersize; 2265 size = blksize(fs, ip, lbn) - bp->b_resid; 2266 if (size < xfersize) 2267 xfersize = size; 2268 2269 error = 2270 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2271 /* 2272 * If the buffer is not already filled and we encounter an 2273 * error while trying to fill it, we have to clear out any 2274 * garbage data from the pages instantiated for the buffer. 2275 * If we do not, a failed uiomove() during a write can leave 2276 * the prior contents of the pages exposed to a userland mmap. 2277 * 2278 * Note that we need only clear buffers with a transfer size 2279 * equal to the block size because buffers with a shorter 2280 * transfer size were cleared above by the call to ext2_balloc() 2281 * with the BA_CLRBUF flag set. 2282 * 2283 * If the source region for uiomove identically mmaps the 2284 * buffer, uiomove() performed the NOP copy, and the buffer 2285 * content remains valid because the page fault handler 2286 * validated the pages. 2287 */ 2288 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2289 fs->e2fs_bsize == xfersize) 2290 vfs_bio_clrbuf(bp); 2291 2292 vfs_bio_set_flags(bp, ioflag); 2293 2294 /* 2295 * If IO_SYNC each buffer is written synchronously. Otherwise 2296 * if we have a severe page deficiency write the buffer 2297 * asynchronously. Otherwise try to cluster, and if that 2298 * doesn't do it then either do an async write (if O_DIRECT), 2299 * or a delayed write (if not). 2300 */ 2301 if (ioflag & IO_SYNC) { 2302 (void)bwrite(bp); 2303 } else if (vm_page_count_severe() || 2304 buf_dirty_count_severe() || 2305 (ioflag & IO_ASYNC)) { 2306 bp->b_flags |= B_CLUSTEROK; 2307 bawrite(bp); 2308 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2309 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2310 bp->b_flags |= B_CLUSTEROK; 2311 cluster_write(vp, &ip->i_clusterw, bp, 2312 ip->i_size, seqcount, 0); 2313 } else { 2314 bawrite(bp); 2315 } 2316 } else if (ioflag & IO_DIRECT) { 2317 bp->b_flags |= B_CLUSTEROK; 2318 bawrite(bp); 2319 } else { 2320 bp->b_flags |= B_CLUSTEROK; 2321 bdwrite(bp); 2322 } 2323 if (error || xfersize == 0) 2324 break; 2325 } 2326 /* 2327 * If we successfully wrote any data, and we are not the superuser 2328 * we clear the setuid and setgid bits as a precaution against 2329 * tampering. 2330 */ 2331 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2332 ap->a_cred) { 2333 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2334 ip->i_mode &= ~(ISUID | ISGID); 2335 } 2336 if (error) { 2337 if (ioflag & IO_UNIT) { 2338 (void)ext2_truncate(vp, osize, 2339 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2340 uio->uio_offset -= resid - uio->uio_resid; 2341 uio->uio_resid = resid; 2342 } 2343 } 2344 if (uio->uio_resid != resid) { 2345 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2346 if (ioflag & IO_SYNC) 2347 error = ext2_update(vp, 1); 2348 } 2349 return (error); 2350 } 2351