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