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 * Copyright (c) 1982, 1986, 1989, 1993 9 * The Regents of the University of California. All rights reserved. 10 * (c) UNIX System Laboratories, Inc. 11 * All or some portions of this file are derived from material licensed 12 * to the University of California by American Telephone and Telegraph 13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 14 * the permission of UNIX System Laboratories, Inc. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94 41 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95 42 * $FreeBSD$ 43 */ 44 45 #include "opt_suiddir.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/fcntl.h> 51 #include <sys/filio.h> 52 #include <sys/stat.h> 53 #include <sys/bio.h> 54 #include <sys/buf.h> 55 #include <sys/endian.h> 56 #include <sys/priv.h> 57 #include <sys/rwlock.h> 58 #include <sys/mount.h> 59 #include <sys/unistd.h> 60 #include <sys/time.h> 61 #include <sys/vnode.h> 62 #include <sys/namei.h> 63 #include <sys/lockf.h> 64 #include <sys/event.h> 65 #include <sys/conf.h> 66 #include <sys/file.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_param.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vm_object.h> 72 #include <vm/vm_page.h> 73 #include <vm/vm_pager.h> 74 #include <vm/vnode_pager.h> 75 76 #include "opt_directio.h" 77 78 #include <ufs/ufs/dir.h> 79 80 #include <fs/ext2fs/fs.h> 81 #include <fs/ext2fs/inode.h> 82 #include <fs/ext2fs/ext2_extern.h> 83 #include <fs/ext2fs/ext2fs.h> 84 #include <fs/ext2fs/ext2_dinode.h> 85 #include <fs/ext2fs/ext2_dir.h> 86 #include <fs/ext2fs/ext2_mount.h> 87 88 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 89 static void ext2_itimes_locked(struct vnode *); 90 static int ext4_ext_read(struct vop_read_args *); 91 static int ext2_ind_read(struct vop_read_args *); 92 93 static vop_access_t ext2_access; 94 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 95 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 96 struct thread *); 97 static vop_close_t ext2_close; 98 static vop_create_t ext2_create; 99 static vop_fsync_t ext2_fsync; 100 static vop_getattr_t ext2_getattr; 101 static vop_ioctl_t ext2_ioctl; 102 static vop_link_t ext2_link; 103 static vop_mkdir_t ext2_mkdir; 104 static vop_mknod_t ext2_mknod; 105 static vop_open_t ext2_open; 106 static vop_pathconf_t ext2_pathconf; 107 static vop_print_t ext2_print; 108 static vop_read_t ext2_read; 109 static vop_readlink_t ext2_readlink; 110 static vop_remove_t ext2_remove; 111 static vop_rename_t ext2_rename; 112 static vop_rmdir_t ext2_rmdir; 113 static vop_setattr_t ext2_setattr; 114 static vop_strategy_t ext2_strategy; 115 static vop_symlink_t ext2_symlink; 116 static vop_write_t ext2_write; 117 static vop_vptofh_t ext2_vptofh; 118 static vop_close_t ext2fifo_close; 119 static vop_kqfilter_t ext2fifo_kqfilter; 120 121 /* Global vfs data structures for ext2. */ 122 struct vop_vector ext2_vnodeops = { 123 .vop_default = &default_vnodeops, 124 .vop_access = ext2_access, 125 .vop_bmap = ext2_bmap, 126 .vop_cachedlookup = ext2_lookup, 127 .vop_close = ext2_close, 128 .vop_create = ext2_create, 129 .vop_fsync = ext2_fsync, 130 .vop_getpages = vnode_pager_local_getpages, 131 .vop_getpages_async = vnode_pager_local_getpages_async, 132 .vop_getattr = ext2_getattr, 133 .vop_inactive = ext2_inactive, 134 .vop_ioctl = ext2_ioctl, 135 .vop_link = ext2_link, 136 .vop_lookup = vfs_cache_lookup, 137 .vop_mkdir = ext2_mkdir, 138 .vop_mknod = ext2_mknod, 139 .vop_open = ext2_open, 140 .vop_pathconf = ext2_pathconf, 141 .vop_poll = vop_stdpoll, 142 .vop_print = ext2_print, 143 .vop_read = ext2_read, 144 .vop_readdir = ext2_readdir, 145 .vop_readlink = ext2_readlink, 146 .vop_reallocblks = ext2_reallocblks, 147 .vop_reclaim = ext2_reclaim, 148 .vop_remove = ext2_remove, 149 .vop_rename = ext2_rename, 150 .vop_rmdir = ext2_rmdir, 151 .vop_setattr = ext2_setattr, 152 .vop_strategy = ext2_strategy, 153 .vop_symlink = ext2_symlink, 154 .vop_write = ext2_write, 155 .vop_vptofh = ext2_vptofh, 156 }; 157 158 struct vop_vector ext2_fifoops = { 159 .vop_default = &fifo_specops, 160 .vop_access = ext2_access, 161 .vop_close = ext2fifo_close, 162 .vop_fsync = ext2_fsync, 163 .vop_getattr = ext2_getattr, 164 .vop_inactive = ext2_inactive, 165 .vop_kqfilter = ext2fifo_kqfilter, 166 .vop_print = ext2_print, 167 .vop_read = VOP_PANIC, 168 .vop_reclaim = ext2_reclaim, 169 .vop_setattr = ext2_setattr, 170 .vop_write = VOP_PANIC, 171 .vop_vptofh = ext2_vptofh, 172 }; 173 174 /* 175 * A virgin directory (no blushing please). 176 * Note that the type and namlen fields are reversed relative to ext2. 177 * Also, we don't use `struct odirtemplate', since it would just cause 178 * endianness problems. 179 */ 180 static struct dirtemplate mastertemplate = { 181 0, 12, 1, EXT2_FT_DIR, ".", 182 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 183 }; 184 static struct dirtemplate omastertemplate = { 185 0, 12, 1, EXT2_FT_UNKNOWN, ".", 186 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 187 }; 188 189 static void 190 ext2_itimes_locked(struct vnode *vp) 191 { 192 struct inode *ip; 193 struct timespec ts; 194 195 ASSERT_VI_LOCKED(vp, __func__); 196 197 ip = VTOI(vp); 198 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 199 return; 200 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 201 ip->i_flag |= IN_LAZYMOD; 202 else 203 ip->i_flag |= IN_MODIFIED; 204 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 205 vfs_timestamp(&ts); 206 if (ip->i_flag & IN_ACCESS) { 207 ip->i_atime = ts.tv_sec; 208 ip->i_atimensec = ts.tv_nsec; 209 } 210 if (ip->i_flag & IN_UPDATE) { 211 ip->i_mtime = ts.tv_sec; 212 ip->i_mtimensec = ts.tv_nsec; 213 ip->i_modrev++; 214 } 215 if (ip->i_flag & IN_CHANGE) { 216 ip->i_ctime = ts.tv_sec; 217 ip->i_ctimensec = ts.tv_nsec; 218 } 219 } 220 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 221 } 222 223 void 224 ext2_itimes(struct vnode *vp) 225 { 226 227 VI_LOCK(vp); 228 ext2_itimes_locked(vp); 229 VI_UNLOCK(vp); 230 } 231 232 /* 233 * Create a regular file 234 */ 235 static int 236 ext2_create(struct vop_create_args *ap) 237 { 238 int error; 239 240 error = 241 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 242 ap->a_dvp, ap->a_vpp, ap->a_cnp); 243 if (error != 0) 244 return (error); 245 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 246 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 247 return (0); 248 } 249 250 static int 251 ext2_open(struct vop_open_args *ap) 252 { 253 254 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 255 return (EOPNOTSUPP); 256 257 /* 258 * Files marked append-only must be opened for appending. 259 */ 260 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 261 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 262 return (EPERM); 263 264 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 265 266 return (0); 267 } 268 269 /* 270 * Close called. 271 * 272 * Update the times on the inode. 273 */ 274 static int 275 ext2_close(struct vop_close_args *ap) 276 { 277 struct vnode *vp = ap->a_vp; 278 279 VI_LOCK(vp); 280 if (vp->v_usecount > 1) 281 ext2_itimes_locked(vp); 282 VI_UNLOCK(vp); 283 return (0); 284 } 285 286 static int 287 ext2_access(struct vop_access_args *ap) 288 { 289 struct vnode *vp = ap->a_vp; 290 struct inode *ip = VTOI(vp); 291 accmode_t accmode = ap->a_accmode; 292 int error; 293 294 if (vp->v_type == VBLK || vp->v_type == VCHR) 295 return (EOPNOTSUPP); 296 297 /* 298 * Disallow write attempts on read-only file systems; 299 * unless the file is a socket, fifo, or a block or 300 * character device resident on the file system. 301 */ 302 if (accmode & VWRITE) { 303 switch (vp->v_type) { 304 case VDIR: 305 case VLNK: 306 case VREG: 307 if (vp->v_mount->mnt_flag & MNT_RDONLY) 308 return (EROFS); 309 break; 310 default: 311 break; 312 } 313 } 314 315 /* If immutable bit set, nobody gets to write it. */ 316 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 317 return (EPERM); 318 319 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 320 ap->a_accmode, ap->a_cred, NULL); 321 return (error); 322 } 323 324 static int 325 ext2_getattr(struct vop_getattr_args *ap) 326 { 327 struct vnode *vp = ap->a_vp; 328 struct inode *ip = VTOI(vp); 329 struct vattr *vap = ap->a_vap; 330 331 ext2_itimes(vp); 332 /* 333 * Copy from inode table 334 */ 335 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 336 vap->va_fileid = ip->i_number; 337 vap->va_mode = ip->i_mode & ~IFMT; 338 vap->va_nlink = ip->i_nlink; 339 vap->va_uid = ip->i_uid; 340 vap->va_gid = ip->i_gid; 341 vap->va_rdev = ip->i_rdev; 342 vap->va_size = ip->i_size; 343 vap->va_atime.tv_sec = ip->i_atime; 344 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 345 vap->va_mtime.tv_sec = ip->i_mtime; 346 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 347 vap->va_ctime.tv_sec = ip->i_ctime; 348 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 349 if E2DI_HAS_XTIME(ip) { 350 vap->va_birthtime.tv_sec = ip->i_birthtime; 351 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 352 } 353 vap->va_flags = ip->i_flags; 354 vap->va_gen = ip->i_gen; 355 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 356 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 357 vap->va_type = IFTOVT(ip->i_mode); 358 vap->va_filerev = ip->i_modrev; 359 return (0); 360 } 361 362 /* 363 * Set attribute vnode op. called from several syscalls 364 */ 365 static int 366 ext2_setattr(struct vop_setattr_args *ap) 367 { 368 struct vattr *vap = ap->a_vap; 369 struct vnode *vp = ap->a_vp; 370 struct inode *ip = VTOI(vp); 371 struct ucred *cred = ap->a_cred; 372 struct thread *td = curthread; 373 int error; 374 375 /* 376 * Check for unsettable attributes. 377 */ 378 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 379 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 380 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 381 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 382 return (EINVAL); 383 } 384 if (vap->va_flags != VNOVAL) { 385 /* Disallow flags not supported by ext2fs. */ 386 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 387 return (EOPNOTSUPP); 388 389 if (vp->v_mount->mnt_flag & MNT_RDONLY) 390 return (EROFS); 391 /* 392 * Callers may only modify the file flags on objects they 393 * have VADMIN rights for. 394 */ 395 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 396 return (error); 397 /* 398 * Unprivileged processes and privileged processes in 399 * jail() are not permitted to unset system flags, or 400 * modify flags if any system flags are set. 401 * Privileged non-jail processes may not modify system flags 402 * if securelevel > 0 and any existing system flags are set. 403 */ 404 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 405 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 406 error = securelevel_gt(cred, 0); 407 if (error) 408 return (error); 409 } 410 } else { 411 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 412 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 413 return (EPERM); 414 } 415 ip->i_flags = vap->va_flags; 416 ip->i_flag |= IN_CHANGE; 417 if (ip->i_flags & (IMMUTABLE | APPEND)) 418 return (0); 419 } 420 if (ip->i_flags & (IMMUTABLE | APPEND)) 421 return (EPERM); 422 /* 423 * Go through the fields and update iff not VNOVAL. 424 */ 425 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 426 if (vp->v_mount->mnt_flag & MNT_RDONLY) 427 return (EROFS); 428 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 429 td)) != 0) 430 return (error); 431 } 432 if (vap->va_size != VNOVAL) { 433 /* 434 * Disallow write attempts on read-only file systems; 435 * unless the file is a socket, fifo, or a block or 436 * character device resident on the file system. 437 */ 438 switch (vp->v_type) { 439 case VDIR: 440 return (EISDIR); 441 case VLNK: 442 case VREG: 443 if (vp->v_mount->mnt_flag & MNT_RDONLY) 444 return (EROFS); 445 break; 446 default: 447 break; 448 } 449 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 450 return (error); 451 } 452 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 453 if (vp->v_mount->mnt_flag & MNT_RDONLY) 454 return (EROFS); 455 /* 456 * From utimes(2): 457 * If times is NULL, ... The caller must be the owner of 458 * the file, have permission to write the file, or be the 459 * super-user. 460 * If times is non-NULL, ... The caller must be the owner of 461 * the file or be the super-user. 462 */ 463 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 464 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 465 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 466 return (error); 467 if (vap->va_atime.tv_sec != VNOVAL) 468 ip->i_flag |= IN_ACCESS; 469 if (vap->va_mtime.tv_sec != VNOVAL) 470 ip->i_flag |= IN_CHANGE | IN_UPDATE; 471 ext2_itimes(vp); 472 if (vap->va_atime.tv_sec != VNOVAL) { 473 ip->i_atime = vap->va_atime.tv_sec; 474 ip->i_atimensec = vap->va_atime.tv_nsec; 475 } 476 if (vap->va_mtime.tv_sec != VNOVAL) { 477 ip->i_mtime = vap->va_mtime.tv_sec; 478 ip->i_mtimensec = vap->va_mtime.tv_nsec; 479 } 480 ip->i_birthtime = vap->va_birthtime.tv_sec; 481 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 482 error = ext2_update(vp, 0); 483 if (error) 484 return (error); 485 } 486 error = 0; 487 if (vap->va_mode != (mode_t)VNOVAL) { 488 if (vp->v_mount->mnt_flag & MNT_RDONLY) 489 return (EROFS); 490 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 491 } 492 return (error); 493 } 494 495 /* 496 * Change the mode on a file. 497 * Inode must be locked before calling. 498 */ 499 static int 500 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 501 { 502 struct inode *ip = VTOI(vp); 503 int error; 504 505 /* 506 * To modify the permissions on a file, must possess VADMIN 507 * for that file. 508 */ 509 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 510 return (error); 511 /* 512 * Privileged processes may set the sticky bit on non-directories, 513 * as well as set the setgid bit on a file with a group that the 514 * process is not a member of. 515 */ 516 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 517 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 518 if (error) 519 return (EFTYPE); 520 } 521 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 522 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 523 if (error) 524 return (error); 525 } 526 ip->i_mode &= ~ALLPERMS; 527 ip->i_mode |= (mode & ALLPERMS); 528 ip->i_flag |= IN_CHANGE; 529 return (0); 530 } 531 532 /* 533 * Perform chown operation on inode ip; 534 * inode must be locked prior to call. 535 */ 536 static int 537 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 538 struct thread *td) 539 { 540 struct inode *ip = VTOI(vp); 541 uid_t ouid; 542 gid_t ogid; 543 int error = 0; 544 545 if (uid == (uid_t)VNOVAL) 546 uid = ip->i_uid; 547 if (gid == (gid_t)VNOVAL) 548 gid = ip->i_gid; 549 /* 550 * To modify the ownership of a file, must possess VADMIN 551 * for that file. 552 */ 553 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 554 return (error); 555 /* 556 * To change the owner of a file, or change the group of a file 557 * to a group of which we are not a member, the caller must 558 * have privilege. 559 */ 560 if (uid != ip->i_uid || (gid != ip->i_gid && 561 !groupmember(gid, cred))) { 562 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 563 if (error) 564 return (error); 565 } 566 ogid = ip->i_gid; 567 ouid = ip->i_uid; 568 ip->i_gid = gid; 569 ip->i_uid = uid; 570 ip->i_flag |= IN_CHANGE; 571 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 572 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 573 ip->i_mode &= ~(ISUID | ISGID); 574 } 575 return (0); 576 } 577 578 /* 579 * Synch an open file. 580 */ 581 /* ARGSUSED */ 582 static int 583 ext2_fsync(struct vop_fsync_args *ap) 584 { 585 /* 586 * Flush all dirty buffers associated with a vnode. 587 */ 588 589 vop_stdfsync(ap); 590 591 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 592 } 593 594 /* 595 * Mknod vnode call 596 */ 597 /* ARGSUSED */ 598 static int 599 ext2_mknod(struct vop_mknod_args *ap) 600 { 601 struct vattr *vap = ap->a_vap; 602 struct vnode **vpp = ap->a_vpp; 603 struct inode *ip; 604 ino_t ino; 605 int error; 606 607 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 608 ap->a_dvp, vpp, ap->a_cnp); 609 if (error) 610 return (error); 611 ip = VTOI(*vpp); 612 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 613 if (vap->va_rdev != VNOVAL) { 614 /* 615 * Want to be able to use this to make badblock 616 * inodes, so don't truncate the dev number. 617 */ 618 ip->i_rdev = vap->va_rdev; 619 } 620 /* 621 * Remove inode, then reload it through VFS_VGET so it is 622 * checked to see if it is an alias of an existing entry in 623 * the inode cache. XXX I don't believe this is necessary now. 624 */ 625 (*vpp)->v_type = VNON; 626 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 627 vgone(*vpp); 628 vput(*vpp); 629 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 630 if (error) { 631 *vpp = NULL; 632 return (error); 633 } 634 return (0); 635 } 636 637 static int 638 ext2_remove(struct vop_remove_args *ap) 639 { 640 struct inode *ip; 641 struct vnode *vp = ap->a_vp; 642 struct vnode *dvp = ap->a_dvp; 643 int error; 644 645 ip = VTOI(vp); 646 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 647 (VTOI(dvp)->i_flags & APPEND)) { 648 error = EPERM; 649 goto out; 650 } 651 error = ext2_dirremove(dvp, ap->a_cnp); 652 if (error == 0) { 653 ip->i_nlink--; 654 ip->i_flag |= IN_CHANGE; 655 } 656 out: 657 return (error); 658 } 659 660 /* 661 * link vnode call 662 */ 663 static int 664 ext2_link(struct vop_link_args *ap) 665 { 666 struct vnode *vp = ap->a_vp; 667 struct vnode *tdvp = ap->a_tdvp; 668 struct componentname *cnp = ap->a_cnp; 669 struct inode *ip; 670 int error; 671 672 #ifdef INVARIANTS 673 if ((cnp->cn_flags & HASBUF) == 0) 674 panic("ext2_link: no name"); 675 #endif 676 ip = VTOI(vp); 677 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 678 error = EMLINK; 679 goto out; 680 } 681 if (ip->i_flags & (IMMUTABLE | APPEND)) { 682 error = EPERM; 683 goto out; 684 } 685 ip->i_nlink++; 686 ip->i_flag |= IN_CHANGE; 687 error = ext2_update(vp, !DOINGASYNC(vp)); 688 if (!error) 689 error = ext2_direnter(ip, tdvp, cnp); 690 if (error) { 691 ip->i_nlink--; 692 ip->i_flag |= IN_CHANGE; 693 } 694 out: 695 return (error); 696 } 697 698 /* 699 * Rename system call. 700 * rename("foo", "bar"); 701 * is essentially 702 * unlink("bar"); 703 * link("foo", "bar"); 704 * unlink("foo"); 705 * but ``atomically''. Can't do full commit without saving state in the 706 * inode on disk which isn't feasible at this time. Best we can do is 707 * always guarantee the target exists. 708 * 709 * Basic algorithm is: 710 * 711 * 1) Bump link count on source while we're linking it to the 712 * target. This also ensure the inode won't be deleted out 713 * from underneath us while we work (it may be truncated by 714 * a concurrent `trunc' or `open' for creation). 715 * 2) Link source to destination. If destination already exists, 716 * delete it first. 717 * 3) Unlink source reference to inode if still around. If a 718 * directory was moved and the parent of the destination 719 * is different from the source, patch the ".." entry in the 720 * directory. 721 */ 722 static int 723 ext2_rename(struct vop_rename_args *ap) 724 { 725 struct vnode *tvp = ap->a_tvp; 726 struct vnode *tdvp = ap->a_tdvp; 727 struct vnode *fvp = ap->a_fvp; 728 struct vnode *fdvp = ap->a_fdvp; 729 struct componentname *tcnp = ap->a_tcnp; 730 struct componentname *fcnp = ap->a_fcnp; 731 struct inode *ip, *xp, *dp; 732 struct dirtemplate dirbuf; 733 int doingdirectory = 0, oldparent = 0, newparent = 0; 734 int error = 0; 735 u_char namlen; 736 737 #ifdef INVARIANTS 738 if ((tcnp->cn_flags & HASBUF) == 0 || 739 (fcnp->cn_flags & HASBUF) == 0) 740 panic("ext2_rename: no name"); 741 #endif 742 /* 743 * Check for cross-device rename. 744 */ 745 if ((fvp->v_mount != tdvp->v_mount) || 746 (tvp && (fvp->v_mount != tvp->v_mount))) { 747 error = EXDEV; 748 abortit: 749 if (tdvp == tvp) 750 vrele(tdvp); 751 else 752 vput(tdvp); 753 if (tvp) 754 vput(tvp); 755 vrele(fdvp); 756 vrele(fvp); 757 return (error); 758 } 759 760 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 761 (VTOI(tdvp)->i_flags & APPEND))) { 762 error = EPERM; 763 goto abortit; 764 } 765 766 /* 767 * Renaming a file to itself has no effect. The upper layers should 768 * not call us in that case. Temporarily just warn if they do. 769 */ 770 if (fvp == tvp) { 771 printf("ext2_rename: fvp == tvp (can't happen)\n"); 772 error = 0; 773 goto abortit; 774 } 775 776 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 777 goto abortit; 778 dp = VTOI(fdvp); 779 ip = VTOI(fvp); 780 if (ip->i_nlink >= EXT2_LINK_MAX) { 781 VOP_UNLOCK(fvp, 0); 782 error = EMLINK; 783 goto abortit; 784 } 785 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 786 || (dp->i_flags & APPEND)) { 787 VOP_UNLOCK(fvp, 0); 788 error = EPERM; 789 goto abortit; 790 } 791 if ((ip->i_mode & IFMT) == IFDIR) { 792 /* 793 * Avoid ".", "..", and aliases of "." for obvious reasons. 794 */ 795 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 796 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 797 (ip->i_flag & IN_RENAME)) { 798 VOP_UNLOCK(fvp, 0); 799 error = EINVAL; 800 goto abortit; 801 } 802 ip->i_flag |= IN_RENAME; 803 oldparent = dp->i_number; 804 doingdirectory++; 805 } 806 vrele(fdvp); 807 808 /* 809 * When the target exists, both the directory 810 * and target vnodes are returned locked. 811 */ 812 dp = VTOI(tdvp); 813 xp = NULL; 814 if (tvp) 815 xp = VTOI(tvp); 816 817 /* 818 * 1) Bump link count while we're moving stuff 819 * around. If we crash somewhere before 820 * completing our work, the link count 821 * may be wrong, but correctable. 822 */ 823 ip->i_nlink++; 824 ip->i_flag |= IN_CHANGE; 825 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 826 VOP_UNLOCK(fvp, 0); 827 goto bad; 828 } 829 830 /* 831 * If ".." must be changed (ie the directory gets a new 832 * parent) then the source directory must not be in the 833 * directory hierarchy above the target, as this would 834 * orphan everything below the source directory. Also 835 * the user must have write permission in the source so 836 * as to be able to change "..". We must repeat the call 837 * to namei, as the parent directory is unlocked by the 838 * call to checkpath(). 839 */ 840 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 841 VOP_UNLOCK(fvp, 0); 842 if (oldparent != dp->i_number) 843 newparent = dp->i_number; 844 if (doingdirectory && newparent) { 845 if (error) /* write access check above */ 846 goto bad; 847 if (xp != NULL) 848 vput(tvp); 849 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 850 if (error) 851 goto out; 852 VREF(tdvp); 853 error = relookup(tdvp, &tvp, tcnp); 854 if (error) 855 goto out; 856 vrele(tdvp); 857 dp = VTOI(tdvp); 858 xp = NULL; 859 if (tvp) 860 xp = VTOI(tvp); 861 } 862 /* 863 * 2) If target doesn't exist, link the target 864 * to the source and unlink the source. 865 * Otherwise, rewrite the target directory 866 * entry to reference the source inode and 867 * expunge the original entry's existence. 868 */ 869 if (xp == NULL) { 870 if (dp->i_devvp != ip->i_devvp) 871 panic("ext2_rename: EXDEV"); 872 /* 873 * Account for ".." in new directory. 874 * When source and destination have the same 875 * parent we don't fool with the link count. 876 */ 877 if (doingdirectory && newparent) { 878 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 879 error = EMLINK; 880 goto bad; 881 } 882 dp->i_nlink++; 883 dp->i_flag |= IN_CHANGE; 884 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 885 if (error) 886 goto bad; 887 } 888 error = ext2_direnter(ip, tdvp, tcnp); 889 if (error) { 890 if (doingdirectory && newparent) { 891 dp->i_nlink--; 892 dp->i_flag |= IN_CHANGE; 893 (void)ext2_update(tdvp, 1); 894 } 895 goto bad; 896 } 897 vput(tdvp); 898 } else { 899 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 900 panic("ext2_rename: EXDEV"); 901 /* 902 * Short circuit rename(foo, foo). 903 */ 904 if (xp->i_number == ip->i_number) 905 panic("ext2_rename: same file"); 906 /* 907 * If the parent directory is "sticky", then the user must 908 * own the parent directory, or the destination of the rename, 909 * otherwise the destination may not be changed (except by 910 * root). This implements append-only directories. 911 */ 912 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 913 tcnp->cn_cred->cr_uid != dp->i_uid && 914 xp->i_uid != tcnp->cn_cred->cr_uid) { 915 error = EPERM; 916 goto bad; 917 } 918 /* 919 * Target must be empty if a directory and have no links 920 * to it. Also, ensure source and target are compatible 921 * (both directories, or both not directories). 922 */ 923 if ((xp->i_mode&IFMT) == IFDIR) { 924 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 925 xp->i_nlink > 2) { 926 error = ENOTEMPTY; 927 goto bad; 928 } 929 if (!doingdirectory) { 930 error = ENOTDIR; 931 goto bad; 932 } 933 cache_purge(tdvp); 934 } else if (doingdirectory) { 935 error = EISDIR; 936 goto bad; 937 } 938 error = ext2_dirrewrite(dp, ip, tcnp); 939 if (error) 940 goto bad; 941 /* 942 * If the target directory is in the same 943 * directory as the source directory, 944 * decrement the link count on the parent 945 * of the target directory. 946 */ 947 if (doingdirectory && !newparent) { 948 dp->i_nlink--; 949 dp->i_flag |= IN_CHANGE; 950 } 951 vput(tdvp); 952 /* 953 * Adjust the link count of the target to 954 * reflect the dirrewrite above. If this is 955 * a directory it is empty and there are 956 * no links to it, so we can squash the inode and 957 * any space associated with it. We disallowed 958 * renaming over top of a directory with links to 959 * it above, as the remaining link would point to 960 * a directory without "." or ".." entries. 961 */ 962 xp->i_nlink--; 963 if (doingdirectory) { 964 if (--xp->i_nlink != 0) 965 panic("ext2_rename: linked directory"); 966 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 967 tcnp->cn_cred, tcnp->cn_thread); 968 } 969 xp->i_flag |= IN_CHANGE; 970 vput(tvp); 971 xp = NULL; 972 } 973 974 /* 975 * 3) Unlink the source. 976 */ 977 fcnp->cn_flags &= ~MODMASK; 978 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 979 VREF(fdvp); 980 error = relookup(fdvp, &fvp, fcnp); 981 if (error == 0) 982 vrele(fdvp); 983 if (fvp != NULL) { 984 xp = VTOI(fvp); 985 dp = VTOI(fdvp); 986 } else { 987 /* 988 * From name has disappeared. 989 */ 990 if (doingdirectory) 991 panic("ext2_rename: lost dir entry"); 992 vrele(ap->a_fvp); 993 return (0); 994 } 995 /* 996 * Ensure that the directory entry still exists and has not 997 * changed while the new name has been entered. If the source is 998 * a file then the entry may have been unlinked or renamed. In 999 * either case there is no further work to be done. If the source 1000 * is a directory then it cannot have been rmdir'ed; its link 1001 * count of three would cause a rmdir to fail with ENOTEMPTY. 1002 * The IN_RENAME flag ensures that it cannot be moved by another 1003 * rename. 1004 */ 1005 if (xp != ip) { 1006 if (doingdirectory) 1007 panic("ext2_rename: lost dir entry"); 1008 } else { 1009 /* 1010 * If the source is a directory with a 1011 * new parent, the link count of the old 1012 * parent directory must be decremented 1013 * and ".." set to point to the new parent. 1014 */ 1015 if (doingdirectory && newparent) { 1016 dp->i_nlink--; 1017 dp->i_flag |= IN_CHANGE; 1018 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1019 sizeof(struct dirtemplate), (off_t)0, 1020 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1021 tcnp->cn_cred, NOCRED, NULL, NULL); 1022 if (error == 0) { 1023 /* Like ufs little-endian: */ 1024 namlen = dirbuf.dotdot_type; 1025 if (namlen != 2 || 1026 dirbuf.dotdot_name[0] != '.' || 1027 dirbuf.dotdot_name[1] != '.') { 1028 ext2_dirbad(xp, (doff_t)12, 1029 "rename: mangled dir"); 1030 } else { 1031 dirbuf.dotdot_ino = newparent; 1032 (void) vn_rdwr(UIO_WRITE, fvp, 1033 (caddr_t)&dirbuf, 1034 sizeof(struct dirtemplate), 1035 (off_t)0, UIO_SYSSPACE, 1036 IO_NODELOCKED | IO_SYNC | 1037 IO_NOMACCHECK, tcnp->cn_cred, 1038 NOCRED, NULL, NULL); 1039 cache_purge(fdvp); 1040 } 1041 } 1042 } 1043 error = ext2_dirremove(fdvp, fcnp); 1044 if (!error) { 1045 xp->i_nlink--; 1046 xp->i_flag |= IN_CHANGE; 1047 } 1048 xp->i_flag &= ~IN_RENAME; 1049 } 1050 if (dp) 1051 vput(fdvp); 1052 if (xp) 1053 vput(fvp); 1054 vrele(ap->a_fvp); 1055 return (error); 1056 1057 bad: 1058 if (xp) 1059 vput(ITOV(xp)); 1060 vput(ITOV(dp)); 1061 out: 1062 if (doingdirectory) 1063 ip->i_flag &= ~IN_RENAME; 1064 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1065 ip->i_nlink--; 1066 ip->i_flag |= IN_CHANGE; 1067 ip->i_flag &= ~IN_RENAME; 1068 vput(fvp); 1069 } else 1070 vrele(fvp); 1071 return (error); 1072 } 1073 1074 /* 1075 * Mkdir system call 1076 */ 1077 static int 1078 ext2_mkdir(struct vop_mkdir_args *ap) 1079 { 1080 struct vnode *dvp = ap->a_dvp; 1081 struct vattr *vap = ap->a_vap; 1082 struct componentname *cnp = ap->a_cnp; 1083 struct inode *ip, *dp; 1084 struct vnode *tvp; 1085 struct dirtemplate dirtemplate, *dtp; 1086 int error, dmode; 1087 1088 #ifdef INVARIANTS 1089 if ((cnp->cn_flags & HASBUF) == 0) 1090 panic("ext2_mkdir: no name"); 1091 #endif 1092 dp = VTOI(dvp); 1093 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1094 error = EMLINK; 1095 goto out; 1096 } 1097 dmode = vap->va_mode & 0777; 1098 dmode |= IFDIR; 1099 /* 1100 * Must simulate part of ext2_makeinode here to acquire the inode, 1101 * but not have it entered in the parent directory. The entry is 1102 * made later after writing "." and ".." entries. 1103 */ 1104 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1105 if (error) 1106 goto out; 1107 ip = VTOI(tvp); 1108 ip->i_gid = dp->i_gid; 1109 #ifdef SUIDDIR 1110 { 1111 /* 1112 * if we are hacking owners here, (only do this where told to) 1113 * and we are not giving it TOO root, (would subvert quotas) 1114 * then go ahead and give it to the other user. 1115 * The new directory also inherits the SUID bit. 1116 * If user's UID and dir UID are the same, 1117 * 'give it away' so that the SUID is still forced on. 1118 */ 1119 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1120 (dp->i_mode & ISUID) && dp->i_uid) { 1121 dmode |= ISUID; 1122 ip->i_uid = dp->i_uid; 1123 } else { 1124 ip->i_uid = cnp->cn_cred->cr_uid; 1125 } 1126 } 1127 #else 1128 ip->i_uid = cnp->cn_cred->cr_uid; 1129 #endif 1130 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1131 ip->i_mode = dmode; 1132 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1133 ip->i_nlink = 2; 1134 if (cnp->cn_flags & ISWHITEOUT) 1135 ip->i_flags |= UF_OPAQUE; 1136 error = ext2_update(tvp, 1); 1137 1138 /* 1139 * Bump link count in parent directory 1140 * to reflect work done below. Should 1141 * be done before reference is created 1142 * so reparation is possible if we crash. 1143 */ 1144 dp->i_nlink++; 1145 dp->i_flag |= IN_CHANGE; 1146 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1147 if (error) 1148 goto bad; 1149 1150 /* Initialize directory with "." and ".." from static template. */ 1151 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1152 EXT2F_INCOMPAT_FTYPE)) 1153 dtp = &mastertemplate; 1154 else 1155 dtp = &omastertemplate; 1156 dirtemplate = *dtp; 1157 dirtemplate.dot_ino = ip->i_number; 1158 dirtemplate.dotdot_ino = dp->i_number; 1159 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1160 * so let's just redefine it - for this function only 1161 */ 1162 #undef DIRBLKSIZ 1163 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1164 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1165 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1166 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1167 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1168 NULL, NULL); 1169 if (error) { 1170 dp->i_nlink--; 1171 dp->i_flag |= IN_CHANGE; 1172 goto bad; 1173 } 1174 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1175 /* XXX should grow with balloc() */ 1176 panic("ext2_mkdir: blksize"); 1177 else { 1178 ip->i_size = DIRBLKSIZ; 1179 ip->i_flag |= IN_CHANGE; 1180 } 1181 1182 /* Directory set up, now install its entry in the parent directory. */ 1183 error = ext2_direnter(ip, dvp, cnp); 1184 if (error) { 1185 dp->i_nlink--; 1186 dp->i_flag |= IN_CHANGE; 1187 } 1188 bad: 1189 /* 1190 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1191 * for us because we set the link count to 0. 1192 */ 1193 if (error) { 1194 ip->i_nlink = 0; 1195 ip->i_flag |= IN_CHANGE; 1196 vput(tvp); 1197 } else 1198 *ap->a_vpp = tvp; 1199 out: 1200 return (error); 1201 #undef DIRBLKSIZ 1202 #define DIRBLKSIZ DEV_BSIZE 1203 } 1204 1205 /* 1206 * Rmdir system call. 1207 */ 1208 static int 1209 ext2_rmdir(struct vop_rmdir_args *ap) 1210 { 1211 struct vnode *vp = ap->a_vp; 1212 struct vnode *dvp = ap->a_dvp; 1213 struct componentname *cnp = ap->a_cnp; 1214 struct inode *ip, *dp; 1215 int error; 1216 1217 ip = VTOI(vp); 1218 dp = VTOI(dvp); 1219 1220 /* 1221 * Verify the directory is empty (and valid). 1222 * (Rmdir ".." won't be valid since 1223 * ".." will contain a reference to 1224 * the current directory and thus be 1225 * non-empty.) 1226 */ 1227 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1228 error = ENOTEMPTY; 1229 goto out; 1230 } 1231 if ((dp->i_flags & APPEND) 1232 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1233 error = EPERM; 1234 goto out; 1235 } 1236 /* 1237 * Delete reference to directory before purging 1238 * inode. If we crash in between, the directory 1239 * will be reattached to lost+found, 1240 */ 1241 error = ext2_dirremove(dvp, cnp); 1242 if (error) 1243 goto out; 1244 dp->i_nlink--; 1245 dp->i_flag |= IN_CHANGE; 1246 cache_purge(dvp); 1247 VOP_UNLOCK(dvp, 0); 1248 /* 1249 * Truncate inode. The only stuff left 1250 * in the directory is "." and "..". The 1251 * "." reference is inconsequential since 1252 * we're quashing it. The ".." reference 1253 * has already been adjusted above. We've 1254 * removed the "." reference and the reference 1255 * in the parent directory, but there may be 1256 * other hard links so decrement by 2 and 1257 * worry about them later. 1258 */ 1259 ip->i_nlink -= 2; 1260 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1261 cnp->cn_thread); 1262 cache_purge(ITOV(ip)); 1263 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1264 VOP_UNLOCK(vp, 0); 1265 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1266 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1267 } 1268 out: 1269 return (error); 1270 } 1271 1272 /* 1273 * symlink -- make a symbolic link 1274 */ 1275 static int 1276 ext2_symlink(struct vop_symlink_args *ap) 1277 { 1278 struct vnode *vp, **vpp = ap->a_vpp; 1279 struct inode *ip; 1280 int len, error; 1281 1282 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1283 vpp, ap->a_cnp); 1284 if (error) 1285 return (error); 1286 vp = *vpp; 1287 len = strlen(ap->a_target); 1288 if (len < vp->v_mount->mnt_maxsymlinklen) { 1289 ip = VTOI(vp); 1290 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1291 ip->i_size = len; 1292 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1293 } else 1294 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1295 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1296 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1297 if (error) 1298 vput(vp); 1299 return (error); 1300 } 1301 1302 /* 1303 * Return target name of a symbolic link 1304 */ 1305 static int 1306 ext2_readlink(struct vop_readlink_args *ap) 1307 { 1308 struct vnode *vp = ap->a_vp; 1309 struct inode *ip = VTOI(vp); 1310 int isize; 1311 1312 isize = ip->i_size; 1313 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1314 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1315 return (0); 1316 } 1317 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1318 } 1319 1320 /* 1321 * Calculate the logical to physical mapping if not done already, 1322 * then call the device strategy routine. 1323 * 1324 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1325 * deadlock on memory. See ext2_bmap() for details. 1326 */ 1327 static int 1328 ext2_strategy(struct vop_strategy_args *ap) 1329 { 1330 struct buf *bp = ap->a_bp; 1331 struct vnode *vp = ap->a_vp; 1332 struct bufobj *bo; 1333 daddr_t blkno; 1334 int error; 1335 1336 if (vp->v_type == VBLK || vp->v_type == VCHR) 1337 panic("ext2_strategy: spec"); 1338 if (bp->b_blkno == bp->b_lblkno) { 1339 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1340 bp->b_blkno = blkno; 1341 if (error) { 1342 bp->b_error = error; 1343 bp->b_ioflags |= BIO_ERROR; 1344 bufdone(bp); 1345 return (0); 1346 } 1347 if ((long)bp->b_blkno == -1) 1348 vfs_bio_clrbuf(bp); 1349 } 1350 if ((long)bp->b_blkno == -1) { 1351 bufdone(bp); 1352 return (0); 1353 } 1354 bp->b_iooffset = dbtob(bp->b_blkno); 1355 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1356 BO_STRATEGY(bo, bp); 1357 return (0); 1358 } 1359 1360 /* 1361 * Print out the contents of an inode. 1362 */ 1363 static int 1364 ext2_print(struct vop_print_args *ap) 1365 { 1366 struct vnode *vp = ap->a_vp; 1367 struct inode *ip = VTOI(vp); 1368 1369 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number); 1370 if (vp->v_type == VFIFO) 1371 fifo_printinfo(vp); 1372 printf("\n"); 1373 return (0); 1374 } 1375 1376 /* 1377 * Close wrapper for fifos. 1378 * 1379 * Update the times on the inode then do device close. 1380 */ 1381 static int 1382 ext2fifo_close(struct vop_close_args *ap) 1383 { 1384 struct vnode *vp = ap->a_vp; 1385 1386 VI_LOCK(vp); 1387 if (vp->v_usecount > 1) 1388 ext2_itimes_locked(vp); 1389 VI_UNLOCK(vp); 1390 return (fifo_specops.vop_close(ap)); 1391 } 1392 1393 /* 1394 * Kqfilter wrapper for fifos. 1395 * 1396 * Fall through to ext2 kqfilter routines if needed 1397 */ 1398 static int 1399 ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1400 { 1401 int error; 1402 1403 error = fifo_specops.vop_kqfilter(ap); 1404 if (error) 1405 error = vfs_kqfilter(ap); 1406 return (error); 1407 } 1408 1409 /* 1410 * Return POSIX pathconf information applicable to ext2 filesystems. 1411 */ 1412 static int 1413 ext2_pathconf(struct vop_pathconf_args *ap) 1414 { 1415 int error = 0; 1416 1417 switch (ap->a_name) { 1418 case _PC_LINK_MAX: 1419 *ap->a_retval = EXT2_LINK_MAX; 1420 break; 1421 case _PC_NAME_MAX: 1422 *ap->a_retval = NAME_MAX; 1423 break; 1424 case _PC_PATH_MAX: 1425 *ap->a_retval = PATH_MAX; 1426 break; 1427 case _PC_PIPE_BUF: 1428 *ap->a_retval = PIPE_BUF; 1429 break; 1430 case _PC_CHOWN_RESTRICTED: 1431 *ap->a_retval = 1; 1432 break; 1433 case _PC_NO_TRUNC: 1434 *ap->a_retval = 1; 1435 break; 1436 case _PC_MIN_HOLE_SIZE: 1437 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1438 break; 1439 case _PC_ASYNC_IO: 1440 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1441 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1442 error = EINVAL; 1443 break; 1444 case _PC_PRIO_IO: 1445 *ap->a_retval = 0; 1446 break; 1447 case _PC_SYNC_IO: 1448 *ap->a_retval = 0; 1449 break; 1450 case _PC_ALLOC_SIZE_MIN: 1451 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1452 break; 1453 case _PC_FILESIZEBITS: 1454 *ap->a_retval = 64; 1455 break; 1456 case _PC_REC_INCR_XFER_SIZE: 1457 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1458 break; 1459 case _PC_REC_MAX_XFER_SIZE: 1460 *ap->a_retval = -1; /* means ``unlimited'' */ 1461 break; 1462 case _PC_REC_MIN_XFER_SIZE: 1463 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1464 break; 1465 case _PC_REC_XFER_ALIGN: 1466 *ap->a_retval = PAGE_SIZE; 1467 break; 1468 case _PC_SYMLINK_MAX: 1469 *ap->a_retval = MAXPATHLEN; 1470 break; 1471 1472 default: 1473 error = EINVAL; 1474 break; 1475 } 1476 return (error); 1477 } 1478 1479 /* 1480 * Vnode pointer to File handle 1481 */ 1482 /* ARGSUSED */ 1483 static int 1484 ext2_vptofh(struct vop_vptofh_args *ap) 1485 { 1486 struct inode *ip; 1487 struct ufid *ufhp; 1488 1489 ip = VTOI(ap->a_vp); 1490 ufhp = (struct ufid *)ap->a_fhp; 1491 ufhp->ufid_len = sizeof(struct ufid); 1492 ufhp->ufid_ino = ip->i_number; 1493 ufhp->ufid_gen = ip->i_gen; 1494 return (0); 1495 } 1496 1497 /* 1498 * Initialize the vnode associated with a new inode, handle aliased 1499 * vnodes. 1500 */ 1501 int 1502 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1503 { 1504 struct inode *ip; 1505 struct vnode *vp; 1506 1507 vp = *vpp; 1508 ip = VTOI(vp); 1509 vp->v_type = IFTOVT(ip->i_mode); 1510 if (vp->v_type == VFIFO) 1511 vp->v_op = fifoops; 1512 1513 if (ip->i_number == EXT2_ROOTINO) 1514 vp->v_vflag |= VV_ROOT; 1515 ip->i_modrev = init_va_filerev(); 1516 *vpp = vp; 1517 return (0); 1518 } 1519 1520 /* 1521 * Allocate a new inode. 1522 */ 1523 static int 1524 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1525 struct componentname *cnp) 1526 { 1527 struct inode *ip, *pdir; 1528 struct vnode *tvp; 1529 int error; 1530 1531 pdir = VTOI(dvp); 1532 #ifdef INVARIANTS 1533 if ((cnp->cn_flags & HASBUF) == 0) 1534 panic("ext2_makeinode: no name"); 1535 #endif 1536 *vpp = NULL; 1537 if ((mode & IFMT) == 0) 1538 mode |= IFREG; 1539 1540 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1541 if (error) { 1542 return (error); 1543 } 1544 ip = VTOI(tvp); 1545 ip->i_gid = pdir->i_gid; 1546 #ifdef SUIDDIR 1547 { 1548 /* 1549 * if we are 1550 * not the owner of the directory, 1551 * and we are hacking owners here, (only do this where told to) 1552 * and we are not giving it TOO root, (would subvert quotas) 1553 * then go ahead and give it to the other user. 1554 * Note that this drops off the execute bits for security. 1555 */ 1556 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1557 (pdir->i_mode & ISUID) && 1558 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1559 ip->i_uid = pdir->i_uid; 1560 mode &= ~07111; 1561 } else { 1562 ip->i_uid = cnp->cn_cred->cr_uid; 1563 } 1564 } 1565 #else 1566 ip->i_uid = cnp->cn_cred->cr_uid; 1567 #endif 1568 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1569 ip->i_mode = mode; 1570 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1571 ip->i_nlink = 1; 1572 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1573 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1574 ip->i_mode &= ~ISGID; 1575 } 1576 1577 if (cnp->cn_flags & ISWHITEOUT) 1578 ip->i_flags |= UF_OPAQUE; 1579 1580 /* 1581 * Make sure inode goes to disk before directory entry. 1582 */ 1583 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1584 if (error) 1585 goto bad; 1586 error = ext2_direnter(ip, dvp, cnp); 1587 if (error) 1588 goto bad; 1589 1590 *vpp = tvp; 1591 return (0); 1592 1593 bad: 1594 /* 1595 * Write error occurred trying to update the inode 1596 * or the directory so must deallocate the inode. 1597 */ 1598 ip->i_nlink = 0; 1599 ip->i_flag |= IN_CHANGE; 1600 vput(tvp); 1601 return (error); 1602 } 1603 1604 /* 1605 * Vnode op for reading. 1606 */ 1607 static int 1608 ext2_read(struct vop_read_args *ap) 1609 { 1610 struct vnode *vp; 1611 struct inode *ip; 1612 int error; 1613 1614 vp = ap->a_vp; 1615 ip = VTOI(vp); 1616 1617 /*EXT4_EXT_LOCK(ip);*/ 1618 if (ip->i_flag & IN_E4EXTENTS) 1619 error = ext4_ext_read(ap); 1620 else 1621 error = ext2_ind_read(ap); 1622 /*EXT4_EXT_UNLOCK(ip);*/ 1623 return (error); 1624 } 1625 1626 /* 1627 * Vnode op for reading. 1628 */ 1629 static int 1630 ext2_ind_read(struct vop_read_args *ap) 1631 { 1632 struct vnode *vp; 1633 struct inode *ip; 1634 struct uio *uio; 1635 struct m_ext2fs *fs; 1636 struct buf *bp; 1637 daddr_t lbn, nextlbn; 1638 off_t bytesinfile; 1639 long size, xfersize, blkoffset; 1640 int error, orig_resid, seqcount; 1641 int ioflag; 1642 1643 vp = ap->a_vp; 1644 uio = ap->a_uio; 1645 ioflag = ap->a_ioflag; 1646 1647 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1648 ip = VTOI(vp); 1649 1650 #ifdef INVARIANTS 1651 if (uio->uio_rw != UIO_READ) 1652 panic("%s: mode", "ext2_read"); 1653 1654 if (vp->v_type == VLNK) { 1655 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1656 panic("%s: short symlink", "ext2_read"); 1657 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1658 panic("%s: type %d", "ext2_read", vp->v_type); 1659 #endif 1660 orig_resid = uio->uio_resid; 1661 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1662 if (orig_resid == 0) 1663 return (0); 1664 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1665 fs = ip->i_e2fs; 1666 if (uio->uio_offset < ip->i_size && 1667 uio->uio_offset >= fs->e2fs_maxfilesize) 1668 return (EOVERFLOW); 1669 1670 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1671 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1672 break; 1673 lbn = lblkno(fs, uio->uio_offset); 1674 nextlbn = lbn + 1; 1675 size = blksize(fs, ip, lbn); 1676 blkoffset = blkoff(fs, uio->uio_offset); 1677 1678 xfersize = fs->e2fs_fsize - blkoffset; 1679 if (uio->uio_resid < xfersize) 1680 xfersize = uio->uio_resid; 1681 if (bytesinfile < xfersize) 1682 xfersize = bytesinfile; 1683 1684 if (lblktosize(fs, nextlbn) >= ip->i_size) 1685 error = bread(vp, lbn, size, NOCRED, &bp); 1686 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 1687 error = cluster_read(vp, ip->i_size, lbn, size, 1688 NOCRED, blkoffset + uio->uio_resid, seqcount, 1689 0, &bp); 1690 } else if (seqcount > 1) { 1691 u_int nextsize = blksize(fs, ip, nextlbn); 1692 error = breadn(vp, lbn, 1693 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1694 } else 1695 error = bread(vp, lbn, size, NOCRED, &bp); 1696 if (error) { 1697 brelse(bp); 1698 bp = NULL; 1699 break; 1700 } 1701 1702 /* 1703 * If IO_DIRECT then set B_DIRECT for the buffer. This 1704 * will cause us to attempt to release the buffer later on 1705 * and will cause the buffer cache to attempt to free the 1706 * underlying pages. 1707 */ 1708 if (ioflag & IO_DIRECT) 1709 bp->b_flags |= B_DIRECT; 1710 1711 /* 1712 * We should only get non-zero b_resid when an I/O error 1713 * has occurred, which should cause us to break above. 1714 * However, if the short read did not cause an error, 1715 * then we want to ensure that we do not uiomove bad 1716 * or uninitialized data. 1717 */ 1718 size -= bp->b_resid; 1719 if (size < xfersize) { 1720 if (size == 0) 1721 break; 1722 xfersize = size; 1723 } 1724 error = uiomove((char *)bp->b_data + blkoffset, 1725 (int)xfersize, uio); 1726 if (error) 1727 break; 1728 1729 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1730 /* 1731 * If it's VMIO or direct I/O, then we don't 1732 * need the buf, mark it available for 1733 * freeing. If it's non-direct VMIO, the VM has 1734 * the data. 1735 */ 1736 bp->b_flags |= B_RELBUF; 1737 brelse(bp); 1738 } else { 1739 /* 1740 * Otherwise let whoever 1741 * made the request take care of 1742 * freeing it. We just queue 1743 * it onto another list. 1744 */ 1745 bqrelse(bp); 1746 } 1747 } 1748 1749 /* 1750 * This can only happen in the case of an error 1751 * because the loop above resets bp to NULL on each iteration 1752 * and on normal completion has not set a new value into it. 1753 * so it must have come from a 'break' statement 1754 */ 1755 if (bp != NULL) { 1756 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1757 bp->b_flags |= B_RELBUF; 1758 brelse(bp); 1759 } else { 1760 bqrelse(bp); 1761 } 1762 } 1763 1764 if ((error == 0 || uio->uio_resid != orig_resid) && 1765 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 1766 ip->i_flag |= IN_ACCESS; 1767 return (error); 1768 } 1769 1770 static int 1771 ext2_ioctl(struct vop_ioctl_args *ap) 1772 { 1773 1774 switch (ap->a_command) { 1775 case FIOSEEKDATA: 1776 case FIOSEEKHOLE: 1777 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1778 (off_t *)ap->a_data, ap->a_cred)); 1779 default: 1780 return (ENOTTY); 1781 } 1782 } 1783 1784 /* 1785 * this function handles ext4 extents block mapping 1786 */ 1787 static int 1788 ext4_ext_read(struct vop_read_args *ap) 1789 { 1790 static unsigned char zeroes[EXT2_MAX_BLOCK_SIZE]; 1791 struct vnode *vp; 1792 struct inode *ip; 1793 struct uio *uio; 1794 struct m_ext2fs *fs; 1795 struct buf *bp; 1796 struct ext4_extent nex, *ep; 1797 struct ext4_extent_path path; 1798 daddr_t lbn, newblk; 1799 off_t bytesinfile; 1800 int cache_type; 1801 ssize_t orig_resid; 1802 int error; 1803 long size, xfersize, blkoffset; 1804 1805 vp = ap->a_vp; 1806 ip = VTOI(vp); 1807 uio = ap->a_uio; 1808 memset(&path, 0, sizeof(path)); 1809 1810 orig_resid = uio->uio_resid; 1811 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1812 if (orig_resid == 0) 1813 return (0); 1814 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1815 fs = ip->i_e2fs; 1816 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1817 return (EOVERFLOW); 1818 1819 while (uio->uio_resid > 0) { 1820 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1821 break; 1822 lbn = lblkno(fs, uio->uio_offset); 1823 size = blksize(fs, ip, lbn); 1824 blkoffset = blkoff(fs, uio->uio_offset); 1825 1826 xfersize = fs->e2fs_fsize - blkoffset; 1827 xfersize = MIN(xfersize, uio->uio_resid); 1828 xfersize = MIN(xfersize, bytesinfile); 1829 1830 /* get block from ext4 extent cache */ 1831 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1832 switch (cache_type) { 1833 case EXT4_EXT_CACHE_NO: 1834 ext4_ext_find_extent(fs, ip, lbn, &path); 1835 if (path.ep_is_sparse) 1836 ep = &path.ep_sparse_ext; 1837 else 1838 ep = path.ep_ext; 1839 if (ep == NULL) 1840 return (EIO); 1841 1842 ext4_ext_put_cache(ip, ep, 1843 path.ep_is_sparse ? EXT4_EXT_CACHE_GAP : EXT4_EXT_CACHE_IN); 1844 1845 newblk = lbn - ep->e_blk + (ep->e_start_lo | 1846 (daddr_t)ep->e_start_hi << 32); 1847 1848 if (path.ep_bp != NULL) { 1849 brelse(path.ep_bp); 1850 path.ep_bp = NULL; 1851 } 1852 break; 1853 1854 case EXT4_EXT_CACHE_GAP: 1855 /* block has not been allocated yet */ 1856 break; 1857 1858 case EXT4_EXT_CACHE_IN: 1859 newblk = lbn - nex.e_blk + (nex.e_start_lo | 1860 (daddr_t)nex.e_start_hi << 32); 1861 break; 1862 1863 default: 1864 panic("%s: invalid cache type", __func__); 1865 } 1866 1867 if (cache_type == EXT4_EXT_CACHE_GAP || 1868 (cache_type == EXT4_EXT_CACHE_NO && path.ep_is_sparse)) { 1869 if (xfersize > sizeof(zeroes)) 1870 xfersize = sizeof(zeroes); 1871 error = uiomove(zeroes, xfersize, uio); 1872 if (error) 1873 return (error); 1874 } else { 1875 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, 1876 NOCRED, &bp); 1877 if (error) { 1878 brelse(bp); 1879 return (error); 1880 } 1881 1882 size -= bp->b_resid; 1883 if (size < xfersize) { 1884 if (size == 0) { 1885 bqrelse(bp); 1886 break; 1887 } 1888 xfersize = size; 1889 } 1890 error = uiomove(bp->b_data + blkoffset, xfersize, uio); 1891 bqrelse(bp); 1892 if (error) 1893 return (error); 1894 } 1895 } 1896 1897 return (0); 1898 } 1899 1900 /* 1901 * Vnode op for writing. 1902 */ 1903 static int 1904 ext2_write(struct vop_write_args *ap) 1905 { 1906 struct vnode *vp; 1907 struct uio *uio; 1908 struct inode *ip; 1909 struct m_ext2fs *fs; 1910 struct buf *bp; 1911 daddr_t lbn; 1912 off_t osize; 1913 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 1914 1915 ioflag = ap->a_ioflag; 1916 uio = ap->a_uio; 1917 vp = ap->a_vp; 1918 1919 seqcount = ioflag >> IO_SEQSHIFT; 1920 ip = VTOI(vp); 1921 1922 #ifdef INVARIANTS 1923 if (uio->uio_rw != UIO_WRITE) 1924 panic("%s: mode", "ext2_write"); 1925 #endif 1926 1927 switch (vp->v_type) { 1928 case VREG: 1929 if (ioflag & IO_APPEND) 1930 uio->uio_offset = ip->i_size; 1931 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 1932 return (EPERM); 1933 /* FALLTHROUGH */ 1934 case VLNK: 1935 break; 1936 case VDIR: 1937 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 1938 if ((ioflag & IO_SYNC) == 0) 1939 panic("ext2_write: nonsync dir write"); 1940 break; 1941 default: 1942 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 1943 vp->v_type, (intmax_t)uio->uio_offset, 1944 (intmax_t)uio->uio_resid); 1945 } 1946 1947 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 1948 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 1949 fs = ip->i_e2fs; 1950 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 1951 return (EFBIG); 1952 /* 1953 * Maybe this should be above the vnode op call, but so long as 1954 * file servers have no limits, I don't think it matters. 1955 */ 1956 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 1957 return (EFBIG); 1958 1959 resid = uio->uio_resid; 1960 osize = ip->i_size; 1961 if (seqcount > BA_SEQMAX) 1962 flags = BA_SEQMAX << BA_SEQSHIFT; 1963 else 1964 flags = seqcount << BA_SEQSHIFT; 1965 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1966 flags |= IO_SYNC; 1967 1968 for (error = 0; uio->uio_resid > 0;) { 1969 lbn = lblkno(fs, uio->uio_offset); 1970 blkoffset = blkoff(fs, uio->uio_offset); 1971 xfersize = fs->e2fs_fsize - blkoffset; 1972 if (uio->uio_resid < xfersize) 1973 xfersize = uio->uio_resid; 1974 if (uio->uio_offset + xfersize > ip->i_size) 1975 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 1976 1977 /* 1978 * We must perform a read-before-write if the transfer size 1979 * does not cover the entire buffer. 1980 */ 1981 if (fs->e2fs_bsize > xfersize) 1982 flags |= BA_CLRBUF; 1983 else 1984 flags &= ~BA_CLRBUF; 1985 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 1986 ap->a_cred, &bp, flags); 1987 if (error != 0) 1988 break; 1989 1990 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 1991 bp->b_flags |= B_NOCACHE; 1992 if (uio->uio_offset + xfersize > ip->i_size) 1993 ip->i_size = uio->uio_offset + xfersize; 1994 size = blksize(fs, ip, lbn) - bp->b_resid; 1995 if (size < xfersize) 1996 xfersize = size; 1997 1998 error = 1999 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 2000 /* 2001 * If the buffer is not already filled and we encounter an 2002 * error while trying to fill it, we have to clear out any 2003 * garbage data from the pages instantiated for the buffer. 2004 * If we do not, a failed uiomove() during a write can leave 2005 * the prior contents of the pages exposed to a userland mmap. 2006 * 2007 * Note that we need only clear buffers with a transfer size 2008 * equal to the block size because buffers with a shorter 2009 * transfer size were cleared above by the call to ext2_balloc() 2010 * with the BA_CLRBUF flag set. 2011 * 2012 * If the source region for uiomove identically mmaps the 2013 * buffer, uiomove() performed the NOP copy, and the buffer 2014 * content remains valid because the page fault handler 2015 * validated the pages. 2016 */ 2017 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2018 fs->e2fs_bsize == xfersize) 2019 vfs_bio_clrbuf(bp); 2020 if (ioflag & (IO_VMIO|IO_DIRECT)) { 2021 bp->b_flags |= B_RELBUF; 2022 } 2023 2024 /* 2025 * If IO_SYNC each buffer is written synchronously. Otherwise 2026 * if we have a severe page deficiency write the buffer 2027 * asynchronously. Otherwise try to cluster, and if that 2028 * doesn't do it then either do an async write (if O_DIRECT), 2029 * or a delayed write (if not). 2030 */ 2031 if (ioflag & IO_SYNC) { 2032 (void)bwrite(bp); 2033 } else if (vm_page_count_severe() || 2034 buf_dirty_count_severe() || 2035 (ioflag & IO_ASYNC)) { 2036 bp->b_flags |= B_CLUSTEROK; 2037 bawrite(bp); 2038 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2039 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2040 bp->b_flags |= B_CLUSTEROK; 2041 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2042 } else { 2043 bawrite(bp); 2044 } 2045 } else if (ioflag & IO_DIRECT) { 2046 bp->b_flags |= B_CLUSTEROK; 2047 bawrite(bp); 2048 } else { 2049 bp->b_flags |= B_CLUSTEROK; 2050 bdwrite(bp); 2051 } 2052 if (error || xfersize == 0) 2053 break; 2054 } 2055 /* 2056 * If we successfully wrote any data, and we are not the superuser 2057 * we clear the setuid and setgid bits as a precaution against 2058 * tampering. 2059 */ 2060 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2061 ap->a_cred) { 2062 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2063 ip->i_mode &= ~(ISUID | ISGID); 2064 } 2065 if (error) { 2066 if (ioflag & IO_UNIT) { 2067 (void)ext2_truncate(vp, osize, 2068 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2069 uio->uio_offset -= resid - uio->uio_resid; 2070 uio->uio_resid = resid; 2071 } 2072 } 2073 if (uio->uio_resid != resid) { 2074 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2075 if (ioflag & IO_SYNC) 2076 error = ext2_update(vp, 1); 2077 } 2078 return (error); 2079 } 2080