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sys/fs/ext2fs/ext2_vnops.c
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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 if (vp->v_type == VBLK || vp->v_type == VCHR) 324 return (EOPNOTSUPP); 325 326 /* 327 * Disallow write attempts on read-only file systems; 328 * unless the file is a socket, fifo, or a block or 329 * character device resident on the file system. 330 */ 331 if (accmode & VWRITE) { 332 switch (vp->v_type) { 333 case VDIR: 334 case VLNK: 335 case VREG: 336 if (vp->v_mount->mnt_flag & MNT_RDONLY) 337 return (EROFS); 338 break; 339 default: 340 break; 341 } 342 } 343 344 /* If immutable bit set, nobody gets to write it. */ 345 if ((accmode & VWRITE) && (ip->i_flags & SF_IMMUTABLE)) 346 return (EPERM); 347 348 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 349 ap->a_accmode, ap->a_cred); 350 return (error); 351 } 352 353 static int 354 ext2_getattr(struct vop_getattr_args *ap) 355 { 356 struct vnode *vp = ap->a_vp; 357 struct inode *ip = VTOI(vp); 358 struct vattr *vap = ap->a_vap; 359 360 ext2_itimes(vp); 361 /* 362 * Copy from inode table 363 */ 364 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 365 vap->va_fileid = ip->i_number; 366 vap->va_mode = ip->i_mode & ~IFMT; 367 vap->va_nlink = ip->i_nlink; 368 vap->va_uid = ip->i_uid; 369 vap->va_gid = ip->i_gid; 370 vap->va_rdev = ip->i_rdev; 371 vap->va_size = ip->i_size; 372 vap->va_atime.tv_sec = ip->i_atime; 373 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 374 vap->va_mtime.tv_sec = ip->i_mtime; 375 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 376 vap->va_ctime.tv_sec = ip->i_ctime; 377 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 378 if E2DI_HAS_XTIME(ip) { 379 vap->va_birthtime.tv_sec = ip->i_birthtime; 380 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 381 } 382 vap->va_flags = ip->i_flags; 383 vap->va_gen = ip->i_gen; 384 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 385 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 386 vap->va_type = IFTOVT(ip->i_mode); 387 vap->va_filerev = ip->i_modrev; 388 return (0); 389 } 390 391 /* 392 * Set attribute vnode op. called from several syscalls 393 */ 394 static int 395 ext2_setattr(struct vop_setattr_args *ap) 396 { 397 struct vattr *vap = ap->a_vap; 398 struct vnode *vp = ap->a_vp; 399 struct inode *ip = VTOI(vp); 400 struct ucred *cred = ap->a_cred; 401 struct thread *td = curthread; 402 int error; 403 404 /* 405 * Check for unsettable attributes. 406 */ 407 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 408 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 409 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 410 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 411 return (EINVAL); 412 } 413 if (vap->va_flags != VNOVAL) { 414 /* Disallow flags not supported by ext2fs. */ 415 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 416 return (EOPNOTSUPP); 417 418 if (vp->v_mount->mnt_flag & MNT_RDONLY) 419 return (EROFS); 420 /* 421 * Callers may only modify the file flags on objects they 422 * have VADMIN rights for. 423 */ 424 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 425 return (error); 426 /* 427 * Unprivileged processes and privileged processes in 428 * jail() are not permitted to unset system flags, or 429 * modify flags if any system flags are set. 430 * Privileged non-jail processes may not modify system flags 431 * if securelevel > 0 and any existing system flags are set. 432 */ 433 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) { 434 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 435 error = securelevel_gt(cred, 0); 436 if (error) 437 return (error); 438 } 439 } else { 440 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 441 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 442 return (EPERM); 443 } 444 ip->i_flags = vap->va_flags; 445 ip->i_flag |= IN_CHANGE; 446 if (ip->i_flags & (IMMUTABLE | APPEND)) 447 return (0); 448 } 449 if (ip->i_flags & (IMMUTABLE | APPEND)) 450 return (EPERM); 451 /* 452 * Go through the fields and update iff not VNOVAL. 453 */ 454 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 455 if (vp->v_mount->mnt_flag & MNT_RDONLY) 456 return (EROFS); 457 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 458 td)) != 0) 459 return (error); 460 } 461 if (vap->va_size != VNOVAL) { 462 /* 463 * Disallow write attempts on read-only file systems; 464 * unless the file is a socket, fifo, or a block or 465 * character device resident on the file system. 466 */ 467 switch (vp->v_type) { 468 case VDIR: 469 return (EISDIR); 470 case VLNK: 471 case VREG: 472 if (vp->v_mount->mnt_flag & MNT_RDONLY) 473 return (EROFS); 474 break; 475 default: 476 break; 477 } 478 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 479 return (error); 480 } 481 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 482 if (vp->v_mount->mnt_flag & MNT_RDONLY) 483 return (EROFS); 484 /* 485 * From utimes(2): 486 * If times is NULL, ... The caller must be the owner of 487 * the file, have permission to write the file, or be the 488 * super-user. 489 * If times is non-NULL, ... The caller must be the owner of 490 * the file or be the super-user. 491 */ 492 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 493 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 494 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 495 return (error); 496 ip->i_flag |= IN_CHANGE | IN_MODIFIED; 497 if (vap->va_atime.tv_sec != VNOVAL) { 498 ip->i_flag &= ~IN_ACCESS; 499 ip->i_atime = vap->va_atime.tv_sec; 500 ip->i_atimensec = vap->va_atime.tv_nsec; 501 } 502 if (vap->va_mtime.tv_sec != VNOVAL) { 503 ip->i_flag &= ~IN_UPDATE; 504 ip->i_mtime = vap->va_mtime.tv_sec; 505 ip->i_mtimensec = vap->va_mtime.tv_nsec; 506 } 507 ip->i_birthtime = vap->va_birthtime.tv_sec; 508 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 509 error = ext2_update(vp, 0); 510 if (error) 511 return (error); 512 } 513 error = 0; 514 if (vap->va_mode != (mode_t)VNOVAL) { 515 if (vp->v_mount->mnt_flag & MNT_RDONLY) 516 return (EROFS); 517 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 518 } 519 return (error); 520 } 521 522 /* 523 * Change the mode on a file. 524 * Inode must be locked before calling. 525 */ 526 static int 527 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 528 { 529 struct inode *ip = VTOI(vp); 530 int error; 531 532 /* 533 * To modify the permissions on a file, must possess VADMIN 534 * for that file. 535 */ 536 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 537 return (error); 538 /* 539 * Privileged processes may set the sticky bit on non-directories, 540 * as well as set the setgid bit on a file with a group that the 541 * process is not a member of. 542 */ 543 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 544 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE); 545 if (error) 546 return (EFTYPE); 547 } 548 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 549 error = priv_check_cred(cred, PRIV_VFS_SETGID); 550 if (error) 551 return (error); 552 } 553 ip->i_mode &= ~ALLPERMS; 554 ip->i_mode |= (mode & ALLPERMS); 555 ip->i_flag |= IN_CHANGE; 556 return (0); 557 } 558 559 /* 560 * Perform chown operation on inode ip; 561 * inode must be locked prior to call. 562 */ 563 static int 564 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 565 struct thread *td) 566 { 567 struct inode *ip = VTOI(vp); 568 uid_t ouid; 569 gid_t ogid; 570 int error = 0; 571 572 if (uid == (uid_t)VNOVAL) 573 uid = ip->i_uid; 574 if (gid == (gid_t)VNOVAL) 575 gid = ip->i_gid; 576 /* 577 * To modify the ownership of a file, must possess VADMIN 578 * for that file. 579 */ 580 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 581 return (error); 582 /* 583 * To change the owner of a file, or change the group of a file 584 * to a group of which we are not a member, the caller must 585 * have privilege. 586 */ 587 if (uid != ip->i_uid || (gid != ip->i_gid && 588 !groupmember(gid, cred))) { 589 error = priv_check_cred(cred, PRIV_VFS_CHOWN); 590 if (error) 591 return (error); 592 } 593 ogid = ip->i_gid; 594 ouid = ip->i_uid; 595 ip->i_gid = gid; 596 ip->i_uid = uid; 597 ip->i_flag |= IN_CHANGE; 598 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 599 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0) 600 ip->i_mode &= ~(ISUID | ISGID); 601 } 602 return (0); 603 } 604 605 /* 606 * Synch an open file. 607 */ 608 /* ARGSUSED */ 609 static int 610 ext2_fsync(struct vop_fsync_args *ap) 611 { 612 /* 613 * Flush all dirty buffers associated with a vnode. 614 */ 615 616 vop_stdfsync(ap); 617 618 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 619 } 620 621 /* 622 * Mknod vnode call 623 */ 624 /* ARGSUSED */ 625 static int 626 ext2_mknod(struct vop_mknod_args *ap) 627 { 628 struct vattr *vap = ap->a_vap; 629 struct vnode **vpp = ap->a_vpp; 630 struct inode *ip; 631 ino_t ino; 632 int error; 633 634 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 635 ap->a_dvp, vpp, ap->a_cnp); 636 if (error) 637 return (error); 638 ip = VTOI(*vpp); 639 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 640 if (vap->va_rdev != VNOVAL) { 641 /* 642 * Want to be able to use this to make badblock 643 * inodes, so don't truncate the dev number. 644 */ 645 if (!(ip->i_flag & IN_E4EXTENTS)) 646 ip->i_rdev = vap->va_rdev; 647 } 648 /* 649 * Remove inode, then reload it through VFS_VGET so it is 650 * checked to see if it is an alias of an existing entry in 651 * the inode cache. XXX I don't believe this is necessary now. 652 */ 653 (*vpp)->v_type = VNON; 654 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 655 vgone(*vpp); 656 vput(*vpp); 657 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 658 if (error) { 659 *vpp = NULL; 660 return (error); 661 } 662 return (0); 663 } 664 665 static int 666 ext2_remove(struct vop_remove_args *ap) 667 { 668 struct inode *ip; 669 struct vnode *vp = ap->a_vp; 670 struct vnode *dvp = ap->a_dvp; 671 int error; 672 673 ip = VTOI(vp); 674 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 675 (VTOI(dvp)->i_flags & APPEND)) { 676 error = EPERM; 677 goto out; 678 } 679 error = ext2_dirremove(dvp, ap->a_cnp); 680 if (error == 0) { 681 ip->i_nlink--; 682 ip->i_flag |= IN_CHANGE; 683 } 684 out: 685 return (error); 686 } 687 688 /* 689 * link vnode call 690 */ 691 static int 692 ext2_link(struct vop_link_args *ap) 693 { 694 struct vnode *vp = ap->a_vp; 695 struct vnode *tdvp = ap->a_tdvp; 696 struct componentname *cnp = ap->a_cnp; 697 struct inode *ip; 698 int error; 699 700 #ifdef INVARIANTS 701 if ((cnp->cn_flags & HASBUF) == 0) 702 panic("ext2_link: no name"); 703 #endif 704 ip = VTOI(vp); 705 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) { 706 error = EMLINK; 707 goto out; 708 } 709 if (ip->i_flags & (IMMUTABLE | APPEND)) { 710 error = EPERM; 711 goto out; 712 } 713 ip->i_nlink++; 714 ip->i_flag |= IN_CHANGE; 715 error = ext2_update(vp, !DOINGASYNC(vp)); 716 if (!error) 717 error = ext2_direnter(ip, tdvp, cnp); 718 if (error) { 719 ip->i_nlink--; 720 ip->i_flag |= IN_CHANGE; 721 } 722 out: 723 return (error); 724 } 725 726 static int 727 ext2_inc_nlink(struct inode *ip) 728 { 729 730 ip->i_nlink++; 731 732 if (S_ISDIR(ip->i_mode) && 733 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) && 734 ip->i_nlink > 1) { 735 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2) 736 ip->i_nlink = 1; 737 } else if (ip->i_nlink > EXT4_LINK_MAX) { 738 ip->i_nlink--; 739 return (EMLINK); 740 } 741 742 return (0); 743 } 744 745 static void 746 ext2_dec_nlink(struct inode *ip) 747 { 748 749 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2) 750 ip->i_nlink--; 751 } 752 753 /* 754 * Rename system call. 755 * rename("foo", "bar"); 756 * is essentially 757 * unlink("bar"); 758 * link("foo", "bar"); 759 * unlink("foo"); 760 * but ``atomically''. Can't do full commit without saving state in the 761 * inode on disk which isn't feasible at this time. Best we can do is 762 * always guarantee the target exists. 763 * 764 * Basic algorithm is: 765 * 766 * 1) Bump link count on source while we're linking it to the 767 * target. This also ensure the inode won't be deleted out 768 * from underneath us while we work (it may be truncated by 769 * a concurrent `trunc' or `open' for creation). 770 * 2) Link source to destination. If destination already exists, 771 * delete it first. 772 * 3) Unlink source reference to inode if still around. If a 773 * directory was moved and the parent of the destination 774 * is different from the source, patch the ".." entry in the 775 * directory. 776 */ 777 static int 778 ext2_rename(struct vop_rename_args *ap) 779 { 780 struct vnode *tvp = ap->a_tvp; 781 struct vnode *tdvp = ap->a_tdvp; 782 struct vnode *fvp = ap->a_fvp; 783 struct vnode *fdvp = ap->a_fdvp; 784 struct componentname *tcnp = ap->a_tcnp; 785 struct componentname *fcnp = ap->a_fcnp; 786 struct inode *ip, *xp, *dp; 787 struct dirtemplate *dirbuf; 788 int doingdirectory = 0, oldparent = 0, newparent = 0; 789 int error = 0; 790 u_char namlen; 791 792 #ifdef INVARIANTS 793 if ((tcnp->cn_flags & HASBUF) == 0 || 794 (fcnp->cn_flags & HASBUF) == 0) 795 panic("ext2_rename: no name"); 796 #endif 797 /* 798 * Check for cross-device rename. 799 */ 800 if ((fvp->v_mount != tdvp->v_mount) || 801 (tvp && (fvp->v_mount != tvp->v_mount))) { 802 error = EXDEV; 803 abortit: 804 if (tdvp == tvp) 805 vrele(tdvp); 806 else 807 vput(tdvp); 808 if (tvp) 809 vput(tvp); 810 vrele(fdvp); 811 vrele(fvp); 812 return (error); 813 } 814 815 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 816 (VTOI(tdvp)->i_flags & APPEND))) { 817 error = EPERM; 818 goto abortit; 819 } 820 821 /* 822 * Renaming a file to itself has no effect. The upper layers should 823 * not call us in that case. Temporarily just warn if they do. 824 */ 825 if (fvp == tvp) { 826 SDT_PROBE2(ext2fs, , vnops, trace, 1, 827 "rename: fvp == tvp (can't happen)"); 828 error = 0; 829 goto abortit; 830 } 831 832 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 833 goto abortit; 834 dp = VTOI(fdvp); 835 ip = VTOI(fvp); 836 if (ip->i_nlink >= EXT4_LINK_MAX && 837 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 838 VOP_UNLOCK(fvp); 839 error = EMLINK; 840 goto abortit; 841 } 842 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 843 || (dp->i_flags & APPEND)) { 844 VOP_UNLOCK(fvp); 845 error = EPERM; 846 goto abortit; 847 } 848 if ((ip->i_mode & IFMT) == IFDIR) { 849 /* 850 * Avoid ".", "..", and aliases of "." for obvious reasons. 851 */ 852 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 853 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 854 (ip->i_flag & IN_RENAME)) { 855 VOP_UNLOCK(fvp); 856 error = EINVAL; 857 goto abortit; 858 } 859 ip->i_flag |= IN_RENAME; 860 oldparent = dp->i_number; 861 doingdirectory++; 862 } 863 vrele(fdvp); 864 865 /* 866 * When the target exists, both the directory 867 * and target vnodes are returned locked. 868 */ 869 dp = VTOI(tdvp); 870 xp = NULL; 871 if (tvp) 872 xp = VTOI(tvp); 873 874 /* 875 * 1) Bump link count while we're moving stuff 876 * around. If we crash somewhere before 877 * completing our work, the link count 878 * may be wrong, but correctable. 879 */ 880 ext2_inc_nlink(ip); 881 ip->i_flag |= IN_CHANGE; 882 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 883 VOP_UNLOCK(fvp); 884 goto bad; 885 } 886 887 /* 888 * If ".." must be changed (ie the directory gets a new 889 * parent) then the source directory must not be in the 890 * directory hierarchy above the target, as this would 891 * orphan everything below the source directory. Also 892 * the user must have write permission in the source so 893 * as to be able to change "..". We must repeat the call 894 * to namei, as the parent directory is unlocked by the 895 * call to checkpath(). 896 */ 897 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 898 VOP_UNLOCK(fvp); 899 if (oldparent != dp->i_number) 900 newparent = dp->i_number; 901 if (doingdirectory && newparent) { 902 if (error) /* write access check above */ 903 goto bad; 904 if (xp != NULL) 905 vput(tvp); 906 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 907 if (error) 908 goto out; 909 VREF(tdvp); 910 error = relookup(tdvp, &tvp, tcnp); 911 if (error) 912 goto out; 913 vrele(tdvp); 914 dp = VTOI(tdvp); 915 xp = NULL; 916 if (tvp) 917 xp = VTOI(tvp); 918 } 919 /* 920 * 2) If target doesn't exist, link the target 921 * to the source and unlink the source. 922 * Otherwise, rewrite the target directory 923 * entry to reference the source inode and 924 * expunge the original entry's existence. 925 */ 926 if (xp == NULL) { 927 if (dp->i_devvp != ip->i_devvp) 928 panic("ext2_rename: EXDEV"); 929 /* 930 * Account for ".." in new directory. 931 * When source and destination have the same 932 * parent we don't fool with the link count. 933 */ 934 if (doingdirectory && newparent) { 935 error = ext2_inc_nlink(dp); 936 if (error) 937 goto bad; 938 939 dp->i_flag |= IN_CHANGE; 940 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 941 if (error) 942 goto bad; 943 } 944 error = ext2_direnter(ip, tdvp, tcnp); 945 if (error) { 946 if (doingdirectory && newparent) { 947 ext2_dec_nlink(dp); 948 dp->i_flag |= IN_CHANGE; 949 (void)ext2_update(tdvp, 1); 950 } 951 goto bad; 952 } 953 vput(tdvp); 954 } else { 955 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 956 panic("ext2_rename: EXDEV"); 957 /* 958 * Short circuit rename(foo, foo). 959 */ 960 if (xp->i_number == ip->i_number) 961 panic("ext2_rename: same file"); 962 /* 963 * If the parent directory is "sticky", then the user must 964 * own the parent directory, or the destination of the rename, 965 * otherwise the destination may not be changed (except by 966 * root). This implements append-only directories. 967 */ 968 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 969 tcnp->cn_cred->cr_uid != dp->i_uid && 970 xp->i_uid != tcnp->cn_cred->cr_uid) { 971 error = EPERM; 972 goto bad; 973 } 974 /* 975 * Target must be empty if a directory and have no links 976 * to it. Also, ensure source and target are compatible 977 * (both directories, or both not directories). 978 */ 979 if ((xp->i_mode & IFMT) == IFDIR) { 980 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) { 981 error = ENOTEMPTY; 982 goto bad; 983 } 984 if (!doingdirectory) { 985 error = ENOTDIR; 986 goto bad; 987 } 988 cache_purge(tdvp); 989 } else if (doingdirectory) { 990 error = EISDIR; 991 goto bad; 992 } 993 error = ext2_dirrewrite(dp, ip, tcnp); 994 if (error) 995 goto bad; 996 /* 997 * If the target directory is in the same 998 * directory as the source directory, 999 * decrement the link count on the parent 1000 * of the target directory. 1001 */ 1002 if (doingdirectory && !newparent) { 1003 ext2_dec_nlink(dp); 1004 dp->i_flag |= IN_CHANGE; 1005 } 1006 vput(tdvp); 1007 /* 1008 * Adjust the link count of the target to 1009 * reflect the dirrewrite above. If this is 1010 * a directory it is empty and there are 1011 * no links to it, so we can squash the inode and 1012 * any space associated with it. We disallowed 1013 * renaming over top of a directory with links to 1014 * it above, as the remaining link would point to 1015 * a directory without "." or ".." entries. 1016 */ 1017 ext2_dec_nlink(xp); 1018 if (doingdirectory) { 1019 if (xp->i_nlink > 2) 1020 panic("ext2_rename: linked directory"); 1021 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 1022 tcnp->cn_cred, tcnp->cn_thread); 1023 xp->i_nlink = 0; 1024 } 1025 xp->i_flag |= IN_CHANGE; 1026 vput(tvp); 1027 xp = NULL; 1028 } 1029 1030 /* 1031 * 3) Unlink the source. 1032 */ 1033 fcnp->cn_flags &= ~MODMASK; 1034 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 1035 VREF(fdvp); 1036 error = relookup(fdvp, &fvp, fcnp); 1037 if (error == 0) 1038 vrele(fdvp); 1039 if (fvp != NULL) { 1040 xp = VTOI(fvp); 1041 dp = VTOI(fdvp); 1042 } else { 1043 /* 1044 * From name has disappeared. IN_RENAME is not sufficient 1045 * to protect against directory races due to timing windows, 1046 * so we can't panic here. 1047 */ 1048 vrele(ap->a_fvp); 1049 return (0); 1050 } 1051 /* 1052 * Ensure that the directory entry still exists and has not 1053 * changed while the new name has been entered. If the source is 1054 * a file then the entry may have been unlinked or renamed. In 1055 * either case there is no further work to be done. If the source 1056 * is a directory then it cannot have been rmdir'ed; its link 1057 * count of three would cause a rmdir to fail with ENOTEMPTY. 1058 * The IN_RENAME flag ensures that it cannot be moved by another 1059 * rename. 1060 */ 1061 if (xp != ip) { 1062 /* 1063 * From name resolves to a different inode. IN_RENAME is 1064 * not sufficient protection against timing window races 1065 * so we can't panic here. 1066 */ 1067 } else { 1068 /* 1069 * If the source is a directory with a 1070 * new parent, the link count of the old 1071 * parent directory must be decremented 1072 * and ".." set to point to the new parent. 1073 */ 1074 if (doingdirectory && newparent) { 1075 ext2_dec_nlink(dp); 1076 dp->i_flag |= IN_CHANGE; 1077 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO); 1078 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf, 1079 ip->i_e2fs->e2fs_bsize, (off_t)0, 1080 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1081 tcnp->cn_cred, NOCRED, NULL, NULL); 1082 if (error == 0) { 1083 /* Like ufs little-endian: */ 1084 namlen = dirbuf->dotdot_type; 1085 if (namlen != 2 || 1086 dirbuf->dotdot_name[0] != '.' || 1087 dirbuf->dotdot_name[1] != '.') { 1088 ext2_dirbad(xp, (doff_t)12, 1089 "rename: mangled dir"); 1090 } else { 1091 dirbuf->dotdot_ino = htole32(newparent); 1092 /* 1093 * dirblock 0 could be htree root, 1094 * try both csum update functions. 1095 */ 1096 ext2_dirent_csum_set(ip, 1097 (struct ext2fs_direct_2 *)dirbuf); 1098 ext2_dx_csum_set(ip, 1099 (struct ext2fs_direct_2 *)dirbuf); 1100 (void)vn_rdwr(UIO_WRITE, fvp, 1101 (caddr_t)dirbuf, 1102 ip->i_e2fs->e2fs_bsize, 1103 (off_t)0, UIO_SYSSPACE, 1104 IO_NODELOCKED | IO_SYNC | 1105 IO_NOMACCHECK, tcnp->cn_cred, 1106 NOCRED, NULL, NULL); 1107 cache_purge(fdvp); 1108 } 1109 } 1110 free(dirbuf, M_TEMP); 1111 } 1112 error = ext2_dirremove(fdvp, fcnp); 1113 if (!error) { 1114 ext2_dec_nlink(xp); 1115 xp->i_flag |= IN_CHANGE; 1116 } 1117 xp->i_flag &= ~IN_RENAME; 1118 } 1119 if (dp) 1120 vput(fdvp); 1121 if (xp) 1122 vput(fvp); 1123 vrele(ap->a_fvp); 1124 return (error); 1125 1126 bad: 1127 if (xp) 1128 vput(ITOV(xp)); 1129 vput(ITOV(dp)); 1130 out: 1131 if (doingdirectory) 1132 ip->i_flag &= ~IN_RENAME; 1133 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1134 ext2_dec_nlink(ip); 1135 ip->i_flag |= IN_CHANGE; 1136 ip->i_flag &= ~IN_RENAME; 1137 vput(fvp); 1138 } else 1139 vrele(fvp); 1140 return (error); 1141 } 1142 1143 #ifdef UFS_ACL 1144 static int 1145 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp, 1146 mode_t dmode, struct ucred *cred, struct thread *td) 1147 { 1148 int error; 1149 struct inode *ip = VTOI(tvp); 1150 struct acl *dacl, *acl; 1151 1152 acl = acl_alloc(M_WAITOK); 1153 dacl = acl_alloc(M_WAITOK); 1154 1155 /* 1156 * Retrieve default ACL from parent, if any. 1157 */ 1158 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1159 switch (error) { 1160 case 0: 1161 /* 1162 * Retrieved a default ACL, so merge mode and ACL if 1163 * necessary. If the ACL is empty, fall through to 1164 * the "not defined or available" case. 1165 */ 1166 if (acl->acl_cnt != 0) { 1167 dmode = acl_posix1e_newfilemode(dmode, acl); 1168 ip->i_mode = dmode; 1169 *dacl = *acl; 1170 ext2_sync_acl_from_inode(ip, acl); 1171 break; 1172 } 1173 /* FALLTHROUGH */ 1174 1175 case EOPNOTSUPP: 1176 /* 1177 * Just use the mode as-is. 1178 */ 1179 ip->i_mode = dmode; 1180 error = 0; 1181 goto out; 1182 1183 default: 1184 goto out; 1185 } 1186 1187 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1188 if (error == 0) 1189 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td); 1190 switch (error) { 1191 case 0: 1192 break; 1193 1194 case EOPNOTSUPP: 1195 /* 1196 * XXX: This should not happen, as EOPNOTSUPP above 1197 * was supposed to free acl. 1198 */ 1199 #ifdef DEBUG 1200 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n"); 1201 #endif /* DEBUG */ 1202 break; 1203 1204 default: 1205 goto out; 1206 } 1207 1208 out: 1209 acl_free(acl); 1210 acl_free(dacl); 1211 1212 return (error); 1213 } 1214 1215 static int 1216 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp, 1217 mode_t mode, struct ucred *cred, struct thread *td) 1218 { 1219 int error; 1220 struct inode *ip = VTOI(tvp); 1221 struct acl *acl; 1222 1223 acl = acl_alloc(M_WAITOK); 1224 1225 /* 1226 * Retrieve default ACL for parent, if any. 1227 */ 1228 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td); 1229 switch (error) { 1230 case 0: 1231 /* 1232 * Retrieved a default ACL, so merge mode and ACL if 1233 * necessary. 1234 */ 1235 if (acl->acl_cnt != 0) { 1236 /* 1237 * Two possible ways for default ACL to not 1238 * be present. First, the EA can be 1239 * undefined, or second, the default ACL can 1240 * be blank. If it's blank, fall through to 1241 * the it's not defined case. 1242 */ 1243 mode = acl_posix1e_newfilemode(mode, acl); 1244 ip->i_mode = mode; 1245 ext2_sync_acl_from_inode(ip, acl); 1246 break; 1247 } 1248 /* FALLTHROUGH */ 1249 1250 case EOPNOTSUPP: 1251 /* 1252 * Just use the mode as-is. 1253 */ 1254 ip->i_mode = mode; 1255 error = 0; 1256 goto out; 1257 1258 default: 1259 goto out; 1260 } 1261 1262 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td); 1263 switch (error) { 1264 case 0: 1265 break; 1266 1267 case EOPNOTSUPP: 1268 /* 1269 * XXX: This should not happen, as EOPNOTSUPP above was 1270 * supposed to free acl. 1271 */ 1272 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1273 "but no VOP_SETACL()\n"); 1274 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() " 1275 "but no VOP_SETACL()"); */ 1276 break; 1277 1278 default: 1279 goto out; 1280 } 1281 1282 out: 1283 acl_free(acl); 1284 1285 return (error); 1286 } 1287 1288 #endif /* UFS_ACL */ 1289 1290 /* 1291 * Mkdir system call 1292 */ 1293 static int 1294 ext2_mkdir(struct vop_mkdir_args *ap) 1295 { 1296 struct m_ext2fs *fs; 1297 struct vnode *dvp = ap->a_dvp; 1298 struct vattr *vap = ap->a_vap; 1299 struct componentname *cnp = ap->a_cnp; 1300 struct inode *ip, *dp; 1301 struct vnode *tvp; 1302 struct dirtemplate dirtemplate, *dtp; 1303 char *buf = NULL; 1304 int error, dmode; 1305 1306 #ifdef INVARIANTS 1307 if ((cnp->cn_flags & HASBUF) == 0) 1308 panic("ext2_mkdir: no name"); 1309 #endif 1310 dp = VTOI(dvp); 1311 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX && 1312 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) { 1313 error = EMLINK; 1314 goto out; 1315 } 1316 dmode = vap->va_mode & 0777; 1317 dmode |= IFDIR; 1318 /* 1319 * Must simulate part of ext2_makeinode here to acquire the inode, 1320 * but not have it entered in the parent directory. The entry is 1321 * made later after writing "." and ".." entries. 1322 */ 1323 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1324 if (error) 1325 goto out; 1326 ip = VTOI(tvp); 1327 fs = ip->i_e2fs; 1328 ip->i_gid = dp->i_gid; 1329 #ifdef SUIDDIR 1330 { 1331 /* 1332 * if we are hacking owners here, (only do this where told to) 1333 * and we are not giving it TOO root, (would subvert quotas) 1334 * then go ahead and give it to the other user. 1335 * The new directory also inherits the SUID bit. 1336 * If user's UID and dir UID are the same, 1337 * 'give it away' so that the SUID is still forced on. 1338 */ 1339 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1340 (dp->i_mode & ISUID) && dp->i_uid) { 1341 dmode |= ISUID; 1342 ip->i_uid = dp->i_uid; 1343 } else { 1344 ip->i_uid = cnp->cn_cred->cr_uid; 1345 } 1346 } 1347 #else 1348 ip->i_uid = cnp->cn_cred->cr_uid; 1349 #endif 1350 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1351 ip->i_mode = dmode; 1352 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1353 ip->i_nlink = 2; 1354 if (cnp->cn_flags & ISWHITEOUT) 1355 ip->i_flags |= UF_OPAQUE; 1356 error = ext2_update(tvp, 1); 1357 1358 /* 1359 * Bump link count in parent directory 1360 * to reflect work done below. Should 1361 * be done before reference is created 1362 * so reparation is possible if we crash. 1363 */ 1364 ext2_inc_nlink(dp); 1365 dp->i_flag |= IN_CHANGE; 1366 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1367 if (error) 1368 goto bad; 1369 1370 /* Initialize directory with "." and ".." from static template. */ 1371 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1372 EXT2F_INCOMPAT_FTYPE)) 1373 dtp = &mastertemplate; 1374 else 1375 dtp = &omastertemplate; 1376 dirtemplate = *dtp; 1377 dirtemplate.dot_ino = htole32(ip->i_number); 1378 dirtemplate.dotdot_ino = htole32(dp->i_number); 1379 /* 1380 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's 1381 * just redefine it - for this function only 1382 */ 1383 #undef DIRBLKSIZ 1384 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1385 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12); 1386 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO); 1387 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 1388 dirtemplate.dotdot_reclen = 1389 htole16(le16toh(dirtemplate.dotdot_reclen) - 1390 sizeof(struct ext2fs_direct_tail)); 1391 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ)); 1392 } 1393 memcpy(buf, &dirtemplate, sizeof(dirtemplate)); 1394 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf); 1395 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf, 1396 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE, 1397 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1398 NULL, NULL); 1399 if (error) { 1400 ext2_dec_nlink(dp); 1401 dp->i_flag |= IN_CHANGE; 1402 goto bad; 1403 } 1404 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1405 /* XXX should grow with balloc() */ 1406 panic("ext2_mkdir: blksize"); 1407 else { 1408 ip->i_size = DIRBLKSIZ; 1409 ip->i_flag |= IN_CHANGE; 1410 } 1411 1412 #ifdef UFS_ACL 1413 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1414 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode, 1415 cnp->cn_cred, cnp->cn_thread); 1416 if (error) 1417 goto bad; 1418 } 1419 1420 #endif /* UFS_ACL */ 1421 1422 /* Directory set up, now install its entry in the parent directory. */ 1423 error = ext2_direnter(ip, dvp, cnp); 1424 if (error) { 1425 ext2_dec_nlink(dp); 1426 dp->i_flag |= IN_CHANGE; 1427 } 1428 bad: 1429 /* 1430 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1431 * for us because we set the link count to 0. 1432 */ 1433 if (error) { 1434 ip->i_nlink = 0; 1435 ip->i_flag |= IN_CHANGE; 1436 vput(tvp); 1437 } else 1438 *ap->a_vpp = tvp; 1439 out: 1440 free(buf, M_TEMP); 1441 return (error); 1442 #undef DIRBLKSIZ 1443 #define DIRBLKSIZ DEV_BSIZE 1444 } 1445 1446 /* 1447 * Rmdir system call. 1448 */ 1449 static int 1450 ext2_rmdir(struct vop_rmdir_args *ap) 1451 { 1452 struct vnode *vp = ap->a_vp; 1453 struct vnode *dvp = ap->a_dvp; 1454 struct componentname *cnp = ap->a_cnp; 1455 struct inode *ip, *dp; 1456 int error; 1457 1458 ip = VTOI(vp); 1459 dp = VTOI(dvp); 1460 1461 /* 1462 * Verify the directory is empty (and valid). 1463 * (Rmdir ".." won't be valid since 1464 * ".." will contain a reference to 1465 * the current directory and thus be 1466 * non-empty.) 1467 */ 1468 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1469 error = ENOTEMPTY; 1470 goto out; 1471 } 1472 if ((dp->i_flags & APPEND) 1473 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1474 error = EPERM; 1475 goto out; 1476 } 1477 /* 1478 * Delete reference to directory before purging 1479 * inode. If we crash in between, the directory 1480 * will be reattached to lost+found, 1481 */ 1482 error = ext2_dirremove(dvp, cnp); 1483 if (error) 1484 goto out; 1485 ext2_dec_nlink(dp); 1486 dp->i_flag |= IN_CHANGE; 1487 cache_purge(dvp); 1488 VOP_UNLOCK(dvp); 1489 /* 1490 * Truncate inode. The only stuff left 1491 * in the directory is "." and "..". 1492 */ 1493 ip->i_nlink = 0; 1494 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1495 cnp->cn_thread); 1496 cache_purge(ITOV(ip)); 1497 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1498 VOP_UNLOCK(vp); 1499 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1500 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1501 } 1502 out: 1503 return (error); 1504 } 1505 1506 /* 1507 * symlink -- make a symbolic link 1508 */ 1509 static int 1510 ext2_symlink(struct vop_symlink_args *ap) 1511 { 1512 struct vnode *vp, **vpp = ap->a_vpp; 1513 struct inode *ip; 1514 int len, error; 1515 1516 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1517 vpp, ap->a_cnp); 1518 if (error) 1519 return (error); 1520 vp = *vpp; 1521 len = strlen(ap->a_target); 1522 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1523 ip = VTOI(vp); 1524 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1525 ip->i_size = len; 1526 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1527 } else 1528 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target), 1529 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1530 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1531 if (error) 1532 vput(vp); 1533 return (error); 1534 } 1535 1536 /* 1537 * Return target name of a symbolic link 1538 */ 1539 static int 1540 ext2_readlink(struct vop_readlink_args *ap) 1541 { 1542 struct vnode *vp = ap->a_vp; 1543 struct inode *ip = VTOI(vp); 1544 int isize; 1545 1546 isize = ip->i_size; 1547 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) { 1548 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1549 return (0); 1550 } 1551 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1552 } 1553 1554 /* 1555 * Calculate the logical to physical mapping if not done already, 1556 * then call the device strategy routine. 1557 * 1558 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1559 * deadlock on memory. See ext2_bmap() for details. 1560 */ 1561 static int 1562 ext2_strategy(struct vop_strategy_args *ap) 1563 { 1564 struct buf *bp = ap->a_bp; 1565 struct vnode *vp = ap->a_vp; 1566 struct bufobj *bo; 1567 daddr_t blkno; 1568 int error; 1569 1570 if (vp->v_type == VBLK || vp->v_type == VCHR) 1571 panic("ext2_strategy: spec"); 1572 if (bp->b_blkno == bp->b_lblkno) { 1573 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS) 1574 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL); 1575 else 1576 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1577 1578 bp->b_blkno = blkno; 1579 if (error) { 1580 bp->b_error = error; 1581 bp->b_ioflags |= BIO_ERROR; 1582 bufdone(bp); 1583 return (0); 1584 } 1585 if ((long)bp->b_blkno == -1) 1586 vfs_bio_clrbuf(bp); 1587 } 1588 if ((long)bp->b_blkno == -1) { 1589 bufdone(bp); 1590 return (0); 1591 } 1592 bp->b_iooffset = dbtob(bp->b_blkno); 1593 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1594 BO_STRATEGY(bo, bp); 1595 return (0); 1596 } 1597 1598 /* 1599 * Print out the contents of an inode. 1600 */ 1601 static int 1602 ext2_print(struct vop_print_args *ap) 1603 { 1604 struct vnode *vp = ap->a_vp; 1605 struct inode *ip = VTOI(vp); 1606 1607 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1608 if (vp->v_type == VFIFO) 1609 fifo_printinfo(vp); 1610 printf("\n"); 1611 return (0); 1612 } 1613 1614 /* 1615 * Close wrapper for fifos. 1616 * 1617 * Update the times on the inode then do device close. 1618 */ 1619 static int 1620 ext2fifo_close(struct vop_close_args *ap) 1621 { 1622 struct vnode *vp = ap->a_vp; 1623 1624 VI_LOCK(vp); 1625 if (vp->v_usecount > 1) 1626 ext2_itimes_locked(vp); 1627 VI_UNLOCK(vp); 1628 return (fifo_specops.vop_close(ap)); 1629 } 1630 1631 /* 1632 * Return POSIX pathconf information applicable to ext2 filesystems. 1633 */ 1634 static int 1635 ext2_pathconf(struct vop_pathconf_args *ap) 1636 { 1637 int error = 0; 1638 1639 switch (ap->a_name) { 1640 case _PC_LINK_MAX: 1641 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs, 1642 EXT2F_ROCOMPAT_DIR_NLINK)) 1643 *ap->a_retval = INT_MAX; 1644 else 1645 *ap->a_retval = EXT4_LINK_MAX; 1646 break; 1647 case _PC_NAME_MAX: 1648 *ap->a_retval = NAME_MAX; 1649 break; 1650 case _PC_PIPE_BUF: 1651 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 1652 *ap->a_retval = PIPE_BUF; 1653 else 1654 error = EINVAL; 1655 break; 1656 case _PC_CHOWN_RESTRICTED: 1657 *ap->a_retval = 1; 1658 break; 1659 case _PC_NO_TRUNC: 1660 *ap->a_retval = 1; 1661 break; 1662 1663 #ifdef UFS_ACL 1664 case _PC_ACL_EXTENDED: 1665 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1666 *ap->a_retval = 1; 1667 else 1668 *ap->a_retval = 0; 1669 break; 1670 case _PC_ACL_PATH_MAX: 1671 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS) 1672 *ap->a_retval = ACL_MAX_ENTRIES; 1673 else 1674 *ap->a_retval = 3; 1675 break; 1676 #endif /* UFS_ACL */ 1677 1678 case _PC_MIN_HOLE_SIZE: 1679 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1680 break; 1681 case _PC_PRIO_IO: 1682 *ap->a_retval = 0; 1683 break; 1684 case _PC_SYNC_IO: 1685 *ap->a_retval = 0; 1686 break; 1687 case _PC_ALLOC_SIZE_MIN: 1688 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1689 break; 1690 case _PC_FILESIZEBITS: 1691 *ap->a_retval = 64; 1692 break; 1693 case _PC_REC_INCR_XFER_SIZE: 1694 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1695 break; 1696 case _PC_REC_MAX_XFER_SIZE: 1697 *ap->a_retval = -1; /* means ``unlimited'' */ 1698 break; 1699 case _PC_REC_MIN_XFER_SIZE: 1700 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1701 break; 1702 case _PC_REC_XFER_ALIGN: 1703 *ap->a_retval = PAGE_SIZE; 1704 break; 1705 case _PC_SYMLINK_MAX: 1706 *ap->a_retval = MAXPATHLEN; 1707 break; 1708 1709 default: 1710 error = vop_stdpathconf(ap); 1711 break; 1712 } 1713 return (error); 1714 } 1715 1716 /* 1717 * Vnode operation to remove a named attribute. 1718 */ 1719 static int 1720 ext2_deleteextattr(struct vop_deleteextattr_args *ap) 1721 { 1722 struct inode *ip; 1723 struct m_ext2fs *fs; 1724 int error; 1725 1726 ip = VTOI(ap->a_vp); 1727 fs = ip->i_e2fs; 1728 1729 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1730 return (EOPNOTSUPP); 1731 1732 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1733 return (EOPNOTSUPP); 1734 1735 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1736 ap->a_cred, ap->a_td, VWRITE); 1737 if (error) 1738 return (error); 1739 1740 error = ENOATTR; 1741 1742 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1743 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name); 1744 if (error != ENOATTR) 1745 return (error); 1746 } 1747 1748 if (ip->i_facl) 1749 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name); 1750 1751 return (error); 1752 } 1753 1754 /* 1755 * Vnode operation to retrieve a named extended attribute. 1756 */ 1757 static int 1758 ext2_getextattr(struct vop_getextattr_args *ap) 1759 { 1760 struct inode *ip; 1761 struct m_ext2fs *fs; 1762 int error; 1763 1764 ip = VTOI(ap->a_vp); 1765 fs = ip->i_e2fs; 1766 1767 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1768 return (EOPNOTSUPP); 1769 1770 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1771 return (EOPNOTSUPP); 1772 1773 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1774 ap->a_cred, ap->a_td, VREAD); 1775 if (error) 1776 return (error); 1777 1778 if (ap->a_size != NULL) 1779 *ap->a_size = 0; 1780 1781 error = ENOATTR; 1782 1783 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1784 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace, 1785 ap->a_name, ap->a_uio, ap->a_size); 1786 if (error != ENOATTR) 1787 return (error); 1788 } 1789 1790 if (ip->i_facl) 1791 error = ext2_extattr_block_get(ip, ap->a_attrnamespace, 1792 ap->a_name, ap->a_uio, ap->a_size); 1793 1794 return (error); 1795 } 1796 1797 /* 1798 * Vnode operation to retrieve extended attributes on a vnode. 1799 */ 1800 static int 1801 ext2_listextattr(struct vop_listextattr_args *ap) 1802 { 1803 struct inode *ip; 1804 struct m_ext2fs *fs; 1805 int error; 1806 1807 ip = VTOI(ap->a_vp); 1808 fs = ip->i_e2fs; 1809 1810 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1811 return (EOPNOTSUPP); 1812 1813 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1814 return (EOPNOTSUPP); 1815 1816 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1817 ap->a_cred, ap->a_td, VREAD); 1818 if (error) 1819 return (error); 1820 1821 if (ap->a_size != NULL) 1822 *ap->a_size = 0; 1823 1824 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1825 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace, 1826 ap->a_uio, ap->a_size); 1827 if (error) 1828 return (error); 1829 } 1830 1831 if (ip->i_facl) 1832 error = ext2_extattr_block_list(ip, ap->a_attrnamespace, 1833 ap->a_uio, ap->a_size); 1834 1835 return (error); 1836 } 1837 1838 /* 1839 * Vnode operation to set a named attribute. 1840 */ 1841 static int 1842 ext2_setextattr(struct vop_setextattr_args *ap) 1843 { 1844 struct inode *ip; 1845 struct m_ext2fs *fs; 1846 int error; 1847 1848 ip = VTOI(ap->a_vp); 1849 fs = ip->i_e2fs; 1850 1851 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR)) 1852 return (EOPNOTSUPP); 1853 1854 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1855 return (EOPNOTSUPP); 1856 1857 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1858 ap->a_cred, ap->a_td, VWRITE); 1859 if (error) 1860 return (error); 1861 1862 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name); 1863 if (error) 1864 return (error); 1865 1866 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) { 1867 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace, 1868 ap->a_name, ap->a_uio); 1869 if (error != ENOSPC) 1870 return (error); 1871 } 1872 1873 error = ext2_extattr_block_set(ip, ap->a_attrnamespace, 1874 ap->a_name, ap->a_uio); 1875 1876 return (error); 1877 } 1878 1879 /* 1880 * Vnode pointer to File handle 1881 */ 1882 /* ARGSUSED */ 1883 static int 1884 ext2_vptofh(struct vop_vptofh_args *ap) 1885 { 1886 struct inode *ip; 1887 struct ufid *ufhp; 1888 1889 ip = VTOI(ap->a_vp); 1890 ufhp = (struct ufid *)ap->a_fhp; 1891 ufhp->ufid_len = sizeof(struct ufid); 1892 ufhp->ufid_ino = ip->i_number; 1893 ufhp->ufid_gen = ip->i_gen; 1894 return (0); 1895 } 1896 1897 /* 1898 * Initialize the vnode associated with a new inode, handle aliased 1899 * vnodes. 1900 */ 1901 int 1902 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1903 { 1904 struct inode *ip; 1905 struct vnode *vp; 1906 1907 vp = *vpp; 1908 ip = VTOI(vp); 1909 vp->v_type = IFTOVT(ip->i_mode); 1910 /* 1911 * Only unallocated inodes should be of type VNON. 1912 */ 1913 if (ip->i_mode != 0 && vp->v_type == VNON) 1914 return (EINVAL); 1915 if (vp->v_type == VFIFO) 1916 vp->v_op = fifoops; 1917 1918 if (ip->i_number == EXT2_ROOTINO) 1919 vp->v_vflag |= VV_ROOT; 1920 ip->i_modrev = init_va_filerev(); 1921 *vpp = vp; 1922 return (0); 1923 } 1924 1925 /* 1926 * Allocate a new inode. 1927 */ 1928 static int 1929 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1930 struct componentname *cnp) 1931 { 1932 struct inode *ip, *pdir; 1933 struct vnode *tvp; 1934 int error; 1935 1936 pdir = VTOI(dvp); 1937 #ifdef INVARIANTS 1938 if ((cnp->cn_flags & HASBUF) == 0) 1939 panic("ext2_makeinode: no name"); 1940 #endif 1941 *vpp = NULL; 1942 if ((mode & IFMT) == 0) 1943 mode |= IFREG; 1944 1945 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1946 if (error) { 1947 return (error); 1948 } 1949 ip = VTOI(tvp); 1950 ip->i_gid = pdir->i_gid; 1951 #ifdef SUIDDIR 1952 { 1953 /* 1954 * if we are 1955 * not the owner of the directory, 1956 * and we are hacking owners here, (only do this where told to) 1957 * and we are not giving it TOO root, (would subvert quotas) 1958 * then go ahead and give it to the other user. 1959 * Note that this drops off the execute bits for security. 1960 */ 1961 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1962 (pdir->i_mode & ISUID) && 1963 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1964 ip->i_uid = pdir->i_uid; 1965 mode &= ~07111; 1966 } else { 1967 ip->i_uid = cnp->cn_cred->cr_uid; 1968 } 1969 } 1970 #else 1971 ip->i_uid = cnp->cn_cred->cr_uid; 1972 #endif 1973 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1974 ip->i_mode = mode; 1975 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1976 ip->i_nlink = 1; 1977 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1978 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID)) 1979 ip->i_mode &= ~ISGID; 1980 } 1981 1982 if (cnp->cn_flags & ISWHITEOUT) 1983 ip->i_flags |= UF_OPAQUE; 1984 1985 /* 1986 * Make sure inode goes to disk before directory entry. 1987 */ 1988 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1989 if (error) 1990 goto bad; 1991 1992 #ifdef UFS_ACL 1993 if (dvp->v_mount->mnt_flag & MNT_ACLS) { 1994 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode, 1995 cnp->cn_cred, cnp->cn_thread); 1996 if (error) 1997 goto bad; 1998 } 1999 #endif /* UFS_ACL */ 2000 2001 error = ext2_direnter(ip, dvp, cnp); 2002 if (error) 2003 goto bad; 2004 2005 *vpp = tvp; 2006 return (0); 2007 2008 bad: 2009 /* 2010 * Write error occurred trying to update the inode 2011 * or the directory so must deallocate the inode. 2012 */ 2013 ip->i_nlink = 0; 2014 ip->i_flag |= IN_CHANGE; 2015 vput(tvp); 2016 return (error); 2017 } 2018 2019 /* 2020 * Vnode op for reading. 2021 */ 2022 static int 2023 ext2_read(struct vop_read_args *ap) 2024 { 2025 struct vnode *vp; 2026 struct inode *ip; 2027 struct uio *uio; 2028 struct m_ext2fs *fs; 2029 struct buf *bp; 2030 daddr_t lbn, nextlbn; 2031 off_t bytesinfile; 2032 long size, xfersize, blkoffset; 2033 int error, orig_resid, seqcount; 2034 int ioflag; 2035 2036 vp = ap->a_vp; 2037 uio = ap->a_uio; 2038 ioflag = ap->a_ioflag; 2039 2040 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 2041 ip = VTOI(vp); 2042 2043 #ifdef INVARIANTS 2044 if (uio->uio_rw != UIO_READ) 2045 panic("%s: mode", "ext2_read"); 2046 2047 if (vp->v_type == VLNK) { 2048 if ((int)ip->i_size < 2049 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) 2050 panic("%s: short symlink", "ext2_read"); 2051 } else if (vp->v_type != VREG && vp->v_type != VDIR) 2052 panic("%s: type %d", "ext2_read", vp->v_type); 2053 #endif 2054 orig_resid = uio->uio_resid; 2055 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 2056 if (orig_resid == 0) 2057 return (0); 2058 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 2059 fs = ip->i_e2fs; 2060 if (uio->uio_offset < ip->i_size && 2061 uio->uio_offset >= fs->e2fs_maxfilesize) 2062 return (EOVERFLOW); 2063 2064 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 2065 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 2066 break; 2067 lbn = lblkno(fs, uio->uio_offset); 2068 nextlbn = lbn + 1; 2069 size = blksize(fs, ip, lbn); 2070 blkoffset = blkoff(fs, uio->uio_offset); 2071 2072 xfersize = fs->e2fs_fsize - blkoffset; 2073 if (uio->uio_resid < xfersize) 2074 xfersize = uio->uio_resid; 2075 if (bytesinfile < xfersize) 2076 xfersize = bytesinfile; 2077 2078 if (lblktosize(fs, nextlbn) >= ip->i_size) 2079 error = bread(vp, lbn, size, NOCRED, &bp); 2080 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 2081 error = cluster_read(vp, ip->i_size, lbn, size, 2082 NOCRED, blkoffset + uio->uio_resid, seqcount, 2083 0, &bp); 2084 } else if (seqcount > 1) { 2085 u_int nextsize = blksize(fs, ip, nextlbn); 2086 2087 error = breadn(vp, lbn, 2088 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 2089 } else 2090 error = bread(vp, lbn, size, NOCRED, &bp); 2091 if (error) { 2092 brelse(bp); 2093 bp = NULL; 2094 break; 2095 } 2096 2097 /* 2098 * We should only get non-zero b_resid when an I/O error 2099 * has occurred, which should cause us to break above. 2100 * However, if the short read did not cause an error, 2101 * then we want to ensure that we do not uiomove bad 2102 * or uninitialized data. 2103 */ 2104 size -= bp->b_resid; 2105 if (size < xfersize) { 2106 if (size == 0) 2107 break; 2108 xfersize = size; 2109 } 2110 error = uiomove((char *)bp->b_data + blkoffset, 2111 (int)xfersize, uio); 2112 if (error) 2113 break; 2114 vfs_bio_brelse(bp, ioflag); 2115 } 2116 2117 /* 2118 * This can only happen in the case of an error because the loop 2119 * above resets bp to NULL on each iteration and on normal 2120 * completion has not set a new value into it. so it must have come 2121 * from a 'break' statement 2122 */ 2123 if (bp != NULL) 2124 vfs_bio_brelse(bp, ioflag); 2125 2126 if ((error == 0 || uio->uio_resid != orig_resid) && 2127 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 2128 ip->i_flag |= IN_ACCESS; 2129 return (error); 2130 } 2131 2132 static int 2133 ext2_ioctl(struct vop_ioctl_args *ap) 2134 { 2135 struct vnode *vp; 2136 int error; 2137 2138 vp = ap->a_vp; 2139 switch (ap->a_command) { 2140 case FIOSEEKDATA: 2141 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) { 2142 error = vn_lock(vp, LK_SHARED); 2143 if (error == 0) { 2144 error = ext2_bmap_seekdata(vp, 2145 (off_t *)ap->a_data); 2146 VOP_UNLOCK(vp); 2147 } else 2148 error = EBADF; 2149 return (error); 2150 } 2151 case FIOSEEKHOLE: 2152 return (vn_bmap_seekhole(vp, ap->a_command, 2153 (off_t *)ap->a_data, ap->a_cred)); 2154 default: 2155 return (ENOTTY); 2156 } 2157 } 2158 2159 /* 2160 * Vnode op for writing. 2161 */ 2162 static int 2163 ext2_write(struct vop_write_args *ap) 2164 { 2165 struct vnode *vp; 2166 struct uio *uio; 2167 struct inode *ip; 2168 struct m_ext2fs *fs; 2169 struct buf *bp; 2170 daddr_t lbn; 2171 off_t osize; 2172 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 2173 2174 ioflag = ap->a_ioflag; 2175 uio = ap->a_uio; 2176 vp = ap->a_vp; 2177 2178 seqcount = ioflag >> IO_SEQSHIFT; 2179 ip = VTOI(vp); 2180 2181 #ifdef INVARIANTS 2182 if (uio->uio_rw != UIO_WRITE) 2183 panic("%s: mode", "ext2_write"); 2184 #endif 2185 2186 switch (vp->v_type) { 2187 case VREG: 2188 if (ioflag & IO_APPEND) 2189 uio->uio_offset = ip->i_size; 2190 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 2191 return (EPERM); 2192 /* FALLTHROUGH */ 2193 case VLNK: 2194 break; 2195 case VDIR: 2196 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 2197 if ((ioflag & IO_SYNC) == 0) 2198 panic("ext2_write: nonsync dir write"); 2199 break; 2200 default: 2201 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 2202 vp->v_type, (intmax_t)uio->uio_offset, 2203 (intmax_t)uio->uio_resid); 2204 } 2205 2206 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 2207 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 2208 fs = ip->i_e2fs; 2209 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 2210 return (EFBIG); 2211 /* 2212 * Maybe this should be above the vnode op call, but so long as 2213 * file servers have no limits, I don't think it matters. 2214 */ 2215 error = vn_rlimit_fsize(vp, uio, uio->uio_td); 2216 if (error != 0) 2217 return (error); 2218 2219 resid = uio->uio_resid; 2220 osize = ip->i_size; 2221 if (seqcount > BA_SEQMAX) 2222 flags = BA_SEQMAX << BA_SEQSHIFT; 2223 else 2224 flags = seqcount << BA_SEQSHIFT; 2225 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 2226 flags |= IO_SYNC; 2227 2228 for (error = 0; uio->uio_resid > 0;) { 2229 lbn = lblkno(fs, uio->uio_offset); 2230 blkoffset = blkoff(fs, uio->uio_offset); 2231 xfersize = fs->e2fs_fsize - blkoffset; 2232 if (uio->uio_resid < xfersize) 2233 xfersize = uio->uio_resid; 2234 if (uio->uio_offset + xfersize > ip->i_size) 2235 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 2236 2237 /* 2238 * We must perform a read-before-write if the transfer size 2239 * does not cover the entire buffer. 2240 */ 2241 if (fs->e2fs_bsize > xfersize) 2242 flags |= BA_CLRBUF; 2243 else 2244 flags &= ~BA_CLRBUF; 2245 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 2246 ap->a_cred, &bp, flags); 2247 if (error != 0) 2248 break; 2249 2250 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL)) 2251 bp->b_flags |= B_NOCACHE; 2252 if (uio->uio_offset + xfersize > ip->i_size) 2253 ip->i_size = uio->uio_offset + xfersize; 2254 size = blksize(fs, ip, lbn) - bp->b_resid; 2255 if (size < xfersize) 2256 xfersize = size; 2257 2258 error = 2259 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2260 /* 2261 * If the buffer is not already filled and we encounter an 2262 * error while trying to fill it, we have to clear out any 2263 * garbage data from the pages instantiated for the buffer. 2264 * If we do not, a failed uiomove() during a write can leave 2265 * the prior contents of the pages exposed to a userland mmap. 2266 * 2267 * Note that we need only clear buffers with a transfer size 2268 * equal to the block size because buffers with a shorter 2269 * transfer size were cleared above by the call to ext2_balloc() 2270 * with the BA_CLRBUF flag set. 2271 * 2272 * If the source region for uiomove identically mmaps the 2273 * buffer, uiomove() performed the NOP copy, and the buffer 2274 * content remains valid because the page fault handler 2275 * validated the pages. 2276 */ 2277 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2278 fs->e2fs_bsize == xfersize) 2279 vfs_bio_clrbuf(bp); 2280 2281 vfs_bio_set_flags(bp, ioflag); 2282 2283 /* 2284 * If IO_SYNC each buffer is written synchronously. Otherwise 2285 * if we have a severe page deficiency write the buffer 2286 * asynchronously. Otherwise try to cluster, and if that 2287 * doesn't do it then either do an async write (if O_DIRECT), 2288 * or a delayed write (if not). 2289 */ 2290 if (ioflag & IO_SYNC) { 2291 (void)bwrite(bp); 2292 } else if (vm_page_count_severe() || 2293 buf_dirty_count_severe() || 2294 (ioflag & IO_ASYNC)) { 2295 bp->b_flags |= B_CLUSTEROK; 2296 bawrite(bp); 2297 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2298 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2299 bp->b_flags |= B_CLUSTEROK; 2300 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2301 } else { 2302 bawrite(bp); 2303 } 2304 } else if (ioflag & IO_DIRECT) { 2305 bp->b_flags |= B_CLUSTEROK; 2306 bawrite(bp); 2307 } else { 2308 bp->b_flags |= B_CLUSTEROK; 2309 bdwrite(bp); 2310 } 2311 if (error || xfersize == 0) 2312 break; 2313 } 2314 /* 2315 * If we successfully wrote any data, and we are not the superuser 2316 * we clear the setuid and setgid bits as a precaution against 2317 * tampering. 2318 */ 2319 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2320 ap->a_cred) { 2321 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) 2322 ip->i_mode &= ~(ISUID | ISGID); 2323 } 2324 if (error) { 2325 if (ioflag & IO_UNIT) { 2326 (void)ext2_truncate(vp, osize, 2327 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2328 uio->uio_offset -= resid - uio->uio_resid; 2329 uio->uio_resid = resid; 2330 } 2331 } 2332 if (uio->uio_resid != resid) { 2333 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2334 if (ioflag & IO_SYNC) 2335 error = ext2_update(vp, 1); 2336 } 2337 return (error); 2338 }
Cache object: 9645fcb303936f2cd3567be53ff9ec1c
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