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/mount.h> 58 #include <sys/unistd.h> 59 #include <sys/time.h> 60 #include <sys/vnode.h> 61 #include <sys/namei.h> 62 #include <sys/lockf.h> 63 #include <sys/event.h> 64 #include <sys/conf.h> 65 #include <sys/file.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_page.h> 69 #include <vm/vm_object.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vnode_pager.h> 72 73 #include "opt_directio.h" 74 75 #include <ufs/ufs/dir.h> 76 77 #include <fs/ext2fs/fs.h> 78 #include <fs/ext2fs/inode.h> 79 #include <fs/ext2fs/ext2_extern.h> 80 #include <fs/ext2fs/ext2fs.h> 81 #include <fs/ext2fs/ext2_dinode.h> 82 #include <fs/ext2fs/ext2_dir.h> 83 #include <fs/ext2fs/ext2_mount.h> 84 85 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 86 static void ext2_itimes_locked(struct vnode *); 87 static int ext4_ext_read(struct vop_read_args *); 88 static int ext2_ind_read(struct vop_read_args *); 89 90 static vop_access_t ext2_access; 91 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 92 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 93 struct thread *); 94 static vop_close_t ext2_close; 95 static vop_create_t ext2_create; 96 static vop_fsync_t ext2_fsync; 97 static vop_getattr_t ext2_getattr; 98 static vop_ioctl_t ext2_ioctl; 99 static vop_link_t ext2_link; 100 static vop_mkdir_t ext2_mkdir; 101 static vop_mknod_t ext2_mknod; 102 static vop_open_t ext2_open; 103 static vop_pathconf_t ext2_pathconf; 104 static vop_print_t ext2_print; 105 static vop_read_t ext2_read; 106 static vop_readlink_t ext2_readlink; 107 static vop_remove_t ext2_remove; 108 static vop_rename_t ext2_rename; 109 static vop_rmdir_t ext2_rmdir; 110 static vop_setattr_t ext2_setattr; 111 static vop_strategy_t ext2_strategy; 112 static vop_symlink_t ext2_symlink; 113 static vop_write_t ext2_write; 114 static vop_vptofh_t ext2_vptofh; 115 static vop_close_t ext2fifo_close; 116 static vop_kqfilter_t ext2fifo_kqfilter; 117 118 /* Global vfs data structures for ext2. */ 119 struct vop_vector ext2_vnodeops = { 120 .vop_default = &default_vnodeops, 121 .vop_access = ext2_access, 122 .vop_bmap = ext2_bmap, 123 .vop_cachedlookup = ext2_lookup, 124 .vop_close = ext2_close, 125 .vop_create = ext2_create, 126 .vop_fsync = ext2_fsync, 127 .vop_getattr = ext2_getattr, 128 .vop_inactive = ext2_inactive, 129 .vop_ioctl = ext2_ioctl, 130 .vop_link = ext2_link, 131 .vop_lookup = vfs_cache_lookup, 132 .vop_mkdir = ext2_mkdir, 133 .vop_mknod = ext2_mknod, 134 .vop_open = ext2_open, 135 .vop_pathconf = ext2_pathconf, 136 .vop_poll = vop_stdpoll, 137 .vop_print = ext2_print, 138 .vop_read = ext2_read, 139 .vop_readdir = ext2_readdir, 140 .vop_readlink = ext2_readlink, 141 .vop_reallocblks = ext2_reallocblks, 142 .vop_reclaim = ext2_reclaim, 143 .vop_remove = ext2_remove, 144 .vop_rename = ext2_rename, 145 .vop_rmdir = ext2_rmdir, 146 .vop_setattr = ext2_setattr, 147 .vop_strategy = ext2_strategy, 148 .vop_symlink = ext2_symlink, 149 .vop_write = ext2_write, 150 .vop_vptofh = ext2_vptofh, 151 }; 152 153 struct vop_vector ext2_fifoops = { 154 .vop_default = &fifo_specops, 155 .vop_access = ext2_access, 156 .vop_close = ext2fifo_close, 157 .vop_fsync = ext2_fsync, 158 .vop_getattr = ext2_getattr, 159 .vop_inactive = ext2_inactive, 160 .vop_kqfilter = ext2fifo_kqfilter, 161 .vop_print = ext2_print, 162 .vop_read = VOP_PANIC, 163 .vop_reclaim = ext2_reclaim, 164 .vop_setattr = ext2_setattr, 165 .vop_write = VOP_PANIC, 166 .vop_vptofh = ext2_vptofh, 167 }; 168 169 /* 170 * A virgin directory (no blushing please). 171 * Note that the type and namlen fields are reversed relative to ext2. 172 * Also, we don't use `struct odirtemplate', since it would just cause 173 * endianness problems. 174 */ 175 static struct dirtemplate mastertemplate = { 176 0, 12, 1, EXT2_FT_DIR, ".", 177 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 178 }; 179 static struct dirtemplate omastertemplate = { 180 0, 12, 1, EXT2_FT_UNKNOWN, ".", 181 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 182 }; 183 184 static void 185 ext2_itimes_locked(struct vnode *vp) 186 { 187 struct inode *ip; 188 struct timespec ts; 189 190 ASSERT_VI_LOCKED(vp, __func__); 191 192 ip = VTOI(vp); 193 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 194 return; 195 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 196 ip->i_flag |= IN_LAZYMOD; 197 else 198 ip->i_flag |= IN_MODIFIED; 199 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 200 vfs_timestamp(&ts); 201 if (ip->i_flag & IN_ACCESS) { 202 ip->i_atime = ts.tv_sec; 203 ip->i_atimensec = ts.tv_nsec; 204 } 205 if (ip->i_flag & IN_UPDATE) { 206 ip->i_mtime = ts.tv_sec; 207 ip->i_mtimensec = ts.tv_nsec; 208 ip->i_modrev++; 209 } 210 if (ip->i_flag & IN_CHANGE) { 211 ip->i_ctime = ts.tv_sec; 212 ip->i_ctimensec = ts.tv_nsec; 213 } 214 } 215 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 216 } 217 218 void 219 ext2_itimes(struct vnode *vp) 220 { 221 222 VI_LOCK(vp); 223 ext2_itimes_locked(vp); 224 VI_UNLOCK(vp); 225 } 226 227 /* 228 * Create a regular file 229 */ 230 static int 231 ext2_create(struct vop_create_args *ap) 232 { 233 int error; 234 235 error = 236 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 237 ap->a_dvp, ap->a_vpp, ap->a_cnp); 238 if (error) 239 return (error); 240 return (0); 241 } 242 243 static int 244 ext2_open(struct vop_open_args *ap) 245 { 246 247 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 248 return (EOPNOTSUPP); 249 250 /* 251 * Files marked append-only must be opened for appending. 252 */ 253 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 254 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 255 return (EPERM); 256 257 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 258 259 return (0); 260 } 261 262 /* 263 * Close called. 264 * 265 * Update the times on the inode. 266 */ 267 static int 268 ext2_close(struct vop_close_args *ap) 269 { 270 struct vnode *vp = ap->a_vp; 271 272 VI_LOCK(vp); 273 if (vp->v_usecount > 1) 274 ext2_itimes_locked(vp); 275 VI_UNLOCK(vp); 276 return (0); 277 } 278 279 static int 280 ext2_access(struct vop_access_args *ap) 281 { 282 struct vnode *vp = ap->a_vp; 283 struct inode *ip = VTOI(vp); 284 accmode_t accmode = ap->a_accmode; 285 int error; 286 287 if (vp->v_type == VBLK || vp->v_type == VCHR) 288 return (EOPNOTSUPP); 289 290 /* 291 * Disallow write attempts on read-only file systems; 292 * unless the file is a socket, fifo, or a block or 293 * character device resident on the file system. 294 */ 295 if (accmode & VWRITE) { 296 switch (vp->v_type) { 297 case VDIR: 298 case VLNK: 299 case VREG: 300 if (vp->v_mount->mnt_flag & MNT_RDONLY) 301 return (EROFS); 302 break; 303 default: 304 break; 305 } 306 } 307 308 /* If immutable bit set, nobody gets to write it. */ 309 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 310 return (EPERM); 311 312 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 313 ap->a_accmode, ap->a_cred, NULL); 314 return (error); 315 } 316 317 static int 318 ext2_getattr(struct vop_getattr_args *ap) 319 { 320 struct vnode *vp = ap->a_vp; 321 struct inode *ip = VTOI(vp); 322 struct vattr *vap = ap->a_vap; 323 324 ext2_itimes(vp); 325 /* 326 * Copy from inode table 327 */ 328 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 329 vap->va_fileid = ip->i_number; 330 vap->va_mode = ip->i_mode & ~IFMT; 331 vap->va_nlink = ip->i_nlink; 332 vap->va_uid = ip->i_uid; 333 vap->va_gid = ip->i_gid; 334 vap->va_rdev = ip->i_rdev; 335 vap->va_size = ip->i_size; 336 vap->va_atime.tv_sec = ip->i_atime; 337 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 338 vap->va_mtime.tv_sec = ip->i_mtime; 339 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 340 vap->va_ctime.tv_sec = ip->i_ctime; 341 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 342 if E2DI_HAS_XTIME(ip) { 343 vap->va_birthtime.tv_sec = ip->i_birthtime; 344 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 345 } 346 vap->va_flags = ip->i_flags; 347 /* E4_* flags are private to the driver */ 348 vap->va_flags &= !(E4_INDEX | E4_EXTENTS); 349 vap->va_gen = ip->i_gen; 350 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 351 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 352 vap->va_type = IFTOVT(ip->i_mode); 353 vap->va_filerev = ip->i_modrev; 354 return (0); 355 } 356 357 /* 358 * Set attribute vnode op. called from several syscalls 359 */ 360 static int 361 ext2_setattr(struct vop_setattr_args *ap) 362 { 363 struct vattr *vap = ap->a_vap; 364 struct vnode *vp = ap->a_vp; 365 struct inode *ip = VTOI(vp); 366 struct ucred *cred = ap->a_cred; 367 struct thread *td = curthread; 368 int error; 369 370 /* 371 * Check for unsettable attributes. 372 */ 373 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 374 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 375 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 376 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 377 return (EINVAL); 378 } 379 if (vap->va_flags != VNOVAL) { 380 /* Disallow flags not supported by ext2fs. */ 381 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 382 return (EOPNOTSUPP); 383 384 if (vp->v_mount->mnt_flag & MNT_RDONLY) 385 return (EROFS); 386 /* 387 * Callers may only modify the file flags on objects they 388 * have VADMIN rights for. 389 */ 390 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 391 return (error); 392 /* 393 * Unprivileged processes and privileged processes in 394 * jail() are not permitted to unset system flags, or 395 * modify flags if any system flags are set. 396 * Privileged non-jail processes may not modify system flags 397 * if securelevel > 0 and any existing system flags are set. 398 */ 399 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 400 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 401 error = securelevel_gt(cred, 0); 402 if (error) 403 return (error); 404 } 405 } else { 406 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 407 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 408 return (EPERM); 409 } 410 ip->i_flags = vap->va_flags; 411 ip->i_flag |= IN_CHANGE; 412 if (ip->i_flags & (IMMUTABLE | APPEND)) 413 return (0); 414 } 415 if (ip->i_flags & (IMMUTABLE | APPEND)) 416 return (EPERM); 417 /* 418 * Go through the fields and update iff not VNOVAL. 419 */ 420 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 421 if (vp->v_mount->mnt_flag & MNT_RDONLY) 422 return (EROFS); 423 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 424 td)) != 0) 425 return (error); 426 } 427 if (vap->va_size != VNOVAL) { 428 /* 429 * Disallow write attempts on read-only file systems; 430 * unless the file is a socket, fifo, or a block or 431 * character device resident on the file system. 432 */ 433 switch (vp->v_type) { 434 case VDIR: 435 return (EISDIR); 436 case VLNK: 437 case VREG: 438 if (vp->v_mount->mnt_flag & MNT_RDONLY) 439 return (EROFS); 440 break; 441 default: 442 break; 443 } 444 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 445 return (error); 446 } 447 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 448 if (vp->v_mount->mnt_flag & MNT_RDONLY) 449 return (EROFS); 450 /* 451 * From utimes(2): 452 * If times is NULL, ... The caller must be the owner of 453 * the file, have permission to write the file, or be the 454 * super-user. 455 * If times is non-NULL, ... The caller must be the owner of 456 * the file or be the super-user. 457 */ 458 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 459 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 460 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 461 return (error); 462 if (vap->va_atime.tv_sec != VNOVAL) 463 ip->i_flag |= IN_ACCESS; 464 if (vap->va_mtime.tv_sec != VNOVAL) 465 ip->i_flag |= IN_CHANGE | IN_UPDATE; 466 ext2_itimes(vp); 467 if (vap->va_atime.tv_sec != VNOVAL) { 468 ip->i_atime = vap->va_atime.tv_sec; 469 ip->i_atimensec = vap->va_atime.tv_nsec; 470 } 471 if (vap->va_mtime.tv_sec != VNOVAL) { 472 ip->i_mtime = vap->va_mtime.tv_sec; 473 ip->i_mtimensec = vap->va_mtime.tv_nsec; 474 } 475 ip->i_birthtime = vap->va_birthtime.tv_sec; 476 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 477 error = ext2_update(vp, 0); 478 if (error) 479 return (error); 480 } 481 error = 0; 482 if (vap->va_mode != (mode_t)VNOVAL) { 483 if (vp->v_mount->mnt_flag & MNT_RDONLY) 484 return (EROFS); 485 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 486 } 487 return (error); 488 } 489 490 /* 491 * Change the mode on a file. 492 * Inode must be locked before calling. 493 */ 494 static int 495 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 496 { 497 struct inode *ip = VTOI(vp); 498 int error; 499 500 /* 501 * To modify the permissions on a file, must possess VADMIN 502 * for that file. 503 */ 504 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 505 return (error); 506 /* 507 * Privileged processes may set the sticky bit on non-directories, 508 * as well as set the setgid bit on a file with a group that the 509 * process is not a member of. 510 */ 511 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 512 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 513 if (error) 514 return (EFTYPE); 515 } 516 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 517 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 518 if (error) 519 return (error); 520 } 521 ip->i_mode &= ~ALLPERMS; 522 ip->i_mode |= (mode & ALLPERMS); 523 ip->i_flag |= IN_CHANGE; 524 return (0); 525 } 526 527 /* 528 * Perform chown operation on inode ip; 529 * inode must be locked prior to call. 530 */ 531 static int 532 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 533 struct thread *td) 534 { 535 struct inode *ip = VTOI(vp); 536 uid_t ouid; 537 gid_t ogid; 538 int error = 0; 539 540 if (uid == (uid_t)VNOVAL) 541 uid = ip->i_uid; 542 if (gid == (gid_t)VNOVAL) 543 gid = ip->i_gid; 544 /* 545 * To modify the ownership of a file, must possess VADMIN 546 * for that file. 547 */ 548 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 549 return (error); 550 /* 551 * To change the owner of a file, or change the group of a file 552 * to a group of which we are not a member, the caller must 553 * have privilege. 554 */ 555 if (uid != ip->i_uid || (gid != ip->i_gid && 556 !groupmember(gid, cred))) { 557 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 558 if (error) 559 return (error); 560 } 561 ogid = ip->i_gid; 562 ouid = ip->i_uid; 563 ip->i_gid = gid; 564 ip->i_uid = uid; 565 ip->i_flag |= IN_CHANGE; 566 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 567 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 568 ip->i_mode &= ~(ISUID | ISGID); 569 } 570 return (0); 571 } 572 573 /* 574 * Synch an open file. 575 */ 576 /* ARGSUSED */ 577 static int 578 ext2_fsync(struct vop_fsync_args *ap) 579 { 580 /* 581 * Flush all dirty buffers associated with a vnode. 582 */ 583 584 vop_stdfsync(ap); 585 586 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 587 } 588 589 /* 590 * Mknod vnode call 591 */ 592 /* ARGSUSED */ 593 static int 594 ext2_mknod(struct vop_mknod_args *ap) 595 { 596 struct vattr *vap = ap->a_vap; 597 struct vnode **vpp = ap->a_vpp; 598 struct inode *ip; 599 ino_t ino; 600 int error; 601 602 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 603 ap->a_dvp, vpp, ap->a_cnp); 604 if (error) 605 return (error); 606 ip = VTOI(*vpp); 607 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 608 if (vap->va_rdev != VNOVAL) { 609 /* 610 * Want to be able to use this to make badblock 611 * inodes, so don't truncate the dev number. 612 */ 613 ip->i_rdev = vap->va_rdev; 614 } 615 /* 616 * Remove inode, then reload it through VFS_VGET so it is 617 * checked to see if it is an alias of an existing entry in 618 * the inode cache. XXX I don't believe this is necessary now. 619 */ 620 (*vpp)->v_type = VNON; 621 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 622 vgone(*vpp); 623 vput(*vpp); 624 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 625 if (error) { 626 *vpp = NULL; 627 return (error); 628 } 629 return (0); 630 } 631 632 static int 633 ext2_remove(struct vop_remove_args *ap) 634 { 635 struct inode *ip; 636 struct vnode *vp = ap->a_vp; 637 struct vnode *dvp = ap->a_dvp; 638 int error; 639 640 ip = VTOI(vp); 641 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 642 (VTOI(dvp)->i_flags & APPEND)) { 643 error = EPERM; 644 goto out; 645 } 646 error = ext2_dirremove(dvp, ap->a_cnp); 647 if (error == 0) { 648 ip->i_nlink--; 649 ip->i_flag |= IN_CHANGE; 650 } 651 out: 652 return (error); 653 } 654 655 /* 656 * link vnode call 657 */ 658 static int 659 ext2_link(struct vop_link_args *ap) 660 { 661 struct vnode *vp = ap->a_vp; 662 struct vnode *tdvp = ap->a_tdvp; 663 struct componentname *cnp = ap->a_cnp; 664 struct inode *ip; 665 int error; 666 667 #ifdef INVARIANTS 668 if ((cnp->cn_flags & HASBUF) == 0) 669 panic("ext2_link: no name"); 670 #endif 671 if (tdvp->v_mount != vp->v_mount) { 672 error = EXDEV; 673 goto out; 674 } 675 ip = VTOI(vp); 676 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 677 error = EMLINK; 678 goto out; 679 } 680 if (ip->i_flags & (IMMUTABLE | APPEND)) { 681 error = EPERM; 682 goto out; 683 } 684 ip->i_nlink++; 685 ip->i_flag |= IN_CHANGE; 686 error = ext2_update(vp, !DOINGASYNC(vp)); 687 if (!error) 688 error = ext2_direnter(ip, tdvp, cnp); 689 if (error) { 690 ip->i_nlink--; 691 ip->i_flag |= IN_CHANGE; 692 } 693 out: 694 return (error); 695 } 696 697 /* 698 * Rename system call. 699 * rename("foo", "bar"); 700 * is essentially 701 * unlink("bar"); 702 * link("foo", "bar"); 703 * unlink("foo"); 704 * but ``atomically''. Can't do full commit without saving state in the 705 * inode on disk which isn't feasible at this time. Best we can do is 706 * always guarantee the target exists. 707 * 708 * Basic algorithm is: 709 * 710 * 1) Bump link count on source while we're linking it to the 711 * target. This also ensure the inode won't be deleted out 712 * from underneath us while we work (it may be truncated by 713 * a concurrent `trunc' or `open' for creation). 714 * 2) Link source to destination. If destination already exists, 715 * delete it first. 716 * 3) Unlink source reference to inode if still around. If a 717 * directory was moved and the parent of the destination 718 * is different from the source, patch the ".." entry in the 719 * directory. 720 */ 721 static int 722 ext2_rename(struct vop_rename_args *ap) 723 { 724 struct vnode *tvp = ap->a_tvp; 725 struct vnode *tdvp = ap->a_tdvp; 726 struct vnode *fvp = ap->a_fvp; 727 struct vnode *fdvp = ap->a_fdvp; 728 struct componentname *tcnp = ap->a_tcnp; 729 struct componentname *fcnp = ap->a_fcnp; 730 struct inode *ip, *xp, *dp; 731 struct dirtemplate dirbuf; 732 int doingdirectory = 0, oldparent = 0, newparent = 0; 733 int error = 0; 734 u_char namlen; 735 736 #ifdef INVARIANTS 737 if ((tcnp->cn_flags & HASBUF) == 0 || 738 (fcnp->cn_flags & HASBUF) == 0) 739 panic("ext2_rename: no name"); 740 #endif 741 /* 742 * Check for cross-device rename. 743 */ 744 if ((fvp->v_mount != tdvp->v_mount) || 745 (tvp && (fvp->v_mount != tvp->v_mount))) { 746 error = EXDEV; 747 abortit: 748 if (tdvp == tvp) 749 vrele(tdvp); 750 else 751 vput(tdvp); 752 if (tvp) 753 vput(tvp); 754 vrele(fdvp); 755 vrele(fvp); 756 return (error); 757 } 758 759 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 760 (VTOI(tdvp)->i_flags & APPEND))) { 761 error = EPERM; 762 goto abortit; 763 } 764 765 /* 766 * Renaming a file to itself has no effect. The upper layers should 767 * not call us in that case. Temporarily just warn if they do. 768 */ 769 if (fvp == tvp) { 770 printf("ext2_rename: fvp == tvp (can't happen)\n"); 771 error = 0; 772 goto abortit; 773 } 774 775 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 776 goto abortit; 777 dp = VTOI(fdvp); 778 ip = VTOI(fvp); 779 if (ip->i_nlink >= EXT2_LINK_MAX) { 780 VOP_UNLOCK(fvp, 0); 781 error = EMLINK; 782 goto abortit; 783 } 784 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 785 || (dp->i_flags & APPEND)) { 786 VOP_UNLOCK(fvp, 0); 787 error = EPERM; 788 goto abortit; 789 } 790 if ((ip->i_mode & IFMT) == IFDIR) { 791 /* 792 * Avoid ".", "..", and aliases of "." for obvious reasons. 793 */ 794 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 795 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 796 (ip->i_flag & IN_RENAME)) { 797 VOP_UNLOCK(fvp, 0); 798 error = EINVAL; 799 goto abortit; 800 } 801 ip->i_flag |= IN_RENAME; 802 oldparent = dp->i_number; 803 doingdirectory++; 804 } 805 vrele(fdvp); 806 807 /* 808 * When the target exists, both the directory 809 * and target vnodes are returned locked. 810 */ 811 dp = VTOI(tdvp); 812 xp = NULL; 813 if (tvp) 814 xp = VTOI(tvp); 815 816 /* 817 * 1) Bump link count while we're moving stuff 818 * around. If we crash somewhere before 819 * completing our work, the link count 820 * may be wrong, but correctable. 821 */ 822 ip->i_nlink++; 823 ip->i_flag |= IN_CHANGE; 824 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 825 VOP_UNLOCK(fvp, 0); 826 goto bad; 827 } 828 829 /* 830 * If ".." must be changed (ie the directory gets a new 831 * parent) then the source directory must not be in the 832 * directory hierarchy above the target, as this would 833 * orphan everything below the source directory. Also 834 * the user must have write permission in the source so 835 * as to be able to change "..". We must repeat the call 836 * to namei, as the parent directory is unlocked by the 837 * call to checkpath(). 838 */ 839 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 840 VOP_UNLOCK(fvp, 0); 841 if (oldparent != dp->i_number) 842 newparent = dp->i_number; 843 if (doingdirectory && newparent) { 844 if (error) /* write access check above */ 845 goto bad; 846 if (xp != NULL) 847 vput(tvp); 848 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 849 if (error) 850 goto out; 851 VREF(tdvp); 852 error = relookup(tdvp, &tvp, tcnp); 853 if (error) 854 goto out; 855 vrele(tdvp); 856 dp = VTOI(tdvp); 857 xp = NULL; 858 if (tvp) 859 xp = VTOI(tvp); 860 } 861 /* 862 * 2) If target doesn't exist, link the target 863 * to the source and unlink the source. 864 * Otherwise, rewrite the target directory 865 * entry to reference the source inode and 866 * expunge the original entry's existence. 867 */ 868 if (xp == NULL) { 869 if (dp->i_devvp != ip->i_devvp) 870 panic("ext2_rename: EXDEV"); 871 /* 872 * Account for ".." in new directory. 873 * When source and destination have the same 874 * parent we don't fool with the link count. 875 */ 876 if (doingdirectory && newparent) { 877 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 878 error = EMLINK; 879 goto bad; 880 } 881 dp->i_nlink++; 882 dp->i_flag |= IN_CHANGE; 883 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 884 if (error) 885 goto bad; 886 } 887 error = ext2_direnter(ip, tdvp, tcnp); 888 if (error) { 889 if (doingdirectory && newparent) { 890 dp->i_nlink--; 891 dp->i_flag |= IN_CHANGE; 892 (void)ext2_update(tdvp, 1); 893 } 894 goto bad; 895 } 896 vput(tdvp); 897 } else { 898 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 899 panic("ext2_rename: EXDEV"); 900 /* 901 * Short circuit rename(foo, foo). 902 */ 903 if (xp->i_number == ip->i_number) 904 panic("ext2_rename: same file"); 905 /* 906 * If the parent directory is "sticky", then the user must 907 * own the parent directory, or the destination of the rename, 908 * otherwise the destination may not be changed (except by 909 * root). This implements append-only directories. 910 */ 911 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 912 tcnp->cn_cred->cr_uid != dp->i_uid && 913 xp->i_uid != tcnp->cn_cred->cr_uid) { 914 error = EPERM; 915 goto bad; 916 } 917 /* 918 * Target must be empty if a directory and have no links 919 * to it. Also, ensure source and target are compatible 920 * (both directories, or both not directories). 921 */ 922 if ((xp->i_mode&IFMT) == IFDIR) { 923 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 924 xp->i_nlink > 2) { 925 error = ENOTEMPTY; 926 goto bad; 927 } 928 if (!doingdirectory) { 929 error = ENOTDIR; 930 goto bad; 931 } 932 cache_purge(tdvp); 933 } else if (doingdirectory) { 934 error = EISDIR; 935 goto bad; 936 } 937 error = ext2_dirrewrite(dp, ip, tcnp); 938 if (error) 939 goto bad; 940 /* 941 * If the target directory is in the same 942 * directory as the source directory, 943 * decrement the link count on the parent 944 * of the target directory. 945 */ 946 if (doingdirectory && !newparent) { 947 dp->i_nlink--; 948 dp->i_flag |= IN_CHANGE; 949 } 950 vput(tdvp); 951 /* 952 * Adjust the link count of the target to 953 * reflect the dirrewrite above. If this is 954 * a directory it is empty and there are 955 * no links to it, so we can squash the inode and 956 * any space associated with it. We disallowed 957 * renaming over top of a directory with links to 958 * it above, as the remaining link would point to 959 * a directory without "." or ".." entries. 960 */ 961 xp->i_nlink--; 962 if (doingdirectory) { 963 if (--xp->i_nlink != 0) 964 panic("ext2_rename: linked directory"); 965 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 966 tcnp->cn_cred, tcnp->cn_thread); 967 } 968 xp->i_flag |= IN_CHANGE; 969 vput(tvp); 970 xp = NULL; 971 } 972 973 /* 974 * 3) Unlink the source. 975 */ 976 fcnp->cn_flags &= ~MODMASK; 977 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 978 VREF(fdvp); 979 error = relookup(fdvp, &fvp, fcnp); 980 if (error == 0) 981 vrele(fdvp); 982 if (fvp != NULL) { 983 xp = VTOI(fvp); 984 dp = VTOI(fdvp); 985 } else { 986 /* 987 * From name has disappeared. 988 */ 989 if (doingdirectory) 990 panic("ext2_rename: lost dir entry"); 991 vrele(ap->a_fvp); 992 return (0); 993 } 994 /* 995 * Ensure that the directory entry still exists and has not 996 * changed while the new name has been entered. If the source is 997 * a file then the entry may have been unlinked or renamed. In 998 * either case there is no further work to be done. If the source 999 * is a directory then it cannot have been rmdir'ed; its link 1000 * count of three would cause a rmdir to fail with ENOTEMPTY. 1001 * The IN_RENAME flag ensures that it cannot be moved by another 1002 * rename. 1003 */ 1004 if (xp != ip) { 1005 if (doingdirectory) 1006 panic("ext2_rename: lost dir entry"); 1007 } else { 1008 /* 1009 * If the source is a directory with a 1010 * new parent, the link count of the old 1011 * parent directory must be decremented 1012 * and ".." set to point to the new parent. 1013 */ 1014 if (doingdirectory && newparent) { 1015 dp->i_nlink--; 1016 dp->i_flag |= IN_CHANGE; 1017 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1018 sizeof(struct dirtemplate), (off_t)0, 1019 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1020 tcnp->cn_cred, NOCRED, NULL, NULL); 1021 if (error == 0) { 1022 /* Like ufs little-endian: */ 1023 namlen = dirbuf.dotdot_type; 1024 if (namlen != 2 || 1025 dirbuf.dotdot_name[0] != '.' || 1026 dirbuf.dotdot_name[1] != '.') { 1027 ext2_dirbad(xp, (doff_t)12, 1028 "rename: mangled dir"); 1029 } else { 1030 dirbuf.dotdot_ino = newparent; 1031 (void) vn_rdwr(UIO_WRITE, fvp, 1032 (caddr_t)&dirbuf, 1033 sizeof(struct dirtemplate), 1034 (off_t)0, UIO_SYSSPACE, 1035 IO_NODELOCKED | IO_SYNC | 1036 IO_NOMACCHECK, tcnp->cn_cred, 1037 NOCRED, NULL, NULL); 1038 cache_purge(fdvp); 1039 } 1040 } 1041 } 1042 error = ext2_dirremove(fdvp, fcnp); 1043 if (!error) { 1044 xp->i_nlink--; 1045 xp->i_flag |= IN_CHANGE; 1046 } 1047 xp->i_flag &= ~IN_RENAME; 1048 } 1049 if (dp) 1050 vput(fdvp); 1051 if (xp) 1052 vput(fvp); 1053 vrele(ap->a_fvp); 1054 return (error); 1055 1056 bad: 1057 if (xp) 1058 vput(ITOV(xp)); 1059 vput(ITOV(dp)); 1060 out: 1061 if (doingdirectory) 1062 ip->i_flag &= ~IN_RENAME; 1063 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1064 ip->i_nlink--; 1065 ip->i_flag |= IN_CHANGE; 1066 ip->i_flag &= ~IN_RENAME; 1067 vput(fvp); 1068 } else 1069 vrele(fvp); 1070 return (error); 1071 } 1072 1073 /* 1074 * Mkdir system call 1075 */ 1076 static int 1077 ext2_mkdir(struct vop_mkdir_args *ap) 1078 { 1079 struct vnode *dvp = ap->a_dvp; 1080 struct vattr *vap = ap->a_vap; 1081 struct componentname *cnp = ap->a_cnp; 1082 struct inode *ip, *dp; 1083 struct vnode *tvp; 1084 struct dirtemplate dirtemplate, *dtp; 1085 int error, dmode; 1086 1087 #ifdef INVARIANTS 1088 if ((cnp->cn_flags & HASBUF) == 0) 1089 panic("ext2_mkdir: no name"); 1090 #endif 1091 dp = VTOI(dvp); 1092 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1093 error = EMLINK; 1094 goto out; 1095 } 1096 dmode = vap->va_mode & 0777; 1097 dmode |= IFDIR; 1098 /* 1099 * Must simulate part of ext2_makeinode here to acquire the inode, 1100 * but not have it entered in the parent directory. The entry is 1101 * made later after writing "." and ".." entries. 1102 */ 1103 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1104 if (error) 1105 goto out; 1106 ip = VTOI(tvp); 1107 ip->i_gid = dp->i_gid; 1108 #ifdef SUIDDIR 1109 { 1110 /* 1111 * if we are hacking owners here, (only do this where told to) 1112 * and we are not giving it TOO root, (would subvert quotas) 1113 * then go ahead and give it to the other user. 1114 * The new directory also inherits the SUID bit. 1115 * If user's UID and dir UID are the same, 1116 * 'give it away' so that the SUID is still forced on. 1117 */ 1118 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1119 (dp->i_mode & ISUID) && dp->i_uid) { 1120 dmode |= ISUID; 1121 ip->i_uid = dp->i_uid; 1122 } else { 1123 ip->i_uid = cnp->cn_cred->cr_uid; 1124 } 1125 } 1126 #else 1127 ip->i_uid = cnp->cn_cred->cr_uid; 1128 #endif 1129 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1130 ip->i_mode = dmode; 1131 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1132 ip->i_nlink = 2; 1133 if (cnp->cn_flags & ISWHITEOUT) 1134 ip->i_flags |= UF_OPAQUE; 1135 error = ext2_update(tvp, 1); 1136 1137 /* 1138 * Bump link count in parent directory 1139 * to reflect work done below. Should 1140 * be done before reference is created 1141 * so reparation is possible if we crash. 1142 */ 1143 dp->i_nlink++; 1144 dp->i_flag |= IN_CHANGE; 1145 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1146 if (error) 1147 goto bad; 1148 1149 /* Initialize directory with "." and ".." from static template. */ 1150 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1151 EXT2F_INCOMPAT_FTYPE)) 1152 dtp = &mastertemplate; 1153 else 1154 dtp = &omastertemplate; 1155 dirtemplate = *dtp; 1156 dirtemplate.dot_ino = ip->i_number; 1157 dirtemplate.dotdot_ino = dp->i_number; 1158 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1159 * so let's just redefine it - for this function only 1160 */ 1161 #undef DIRBLKSIZ 1162 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1163 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1164 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1165 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1166 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1167 NULL, NULL); 1168 if (error) { 1169 dp->i_nlink--; 1170 dp->i_flag |= IN_CHANGE; 1171 goto bad; 1172 } 1173 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1174 /* XXX should grow with balloc() */ 1175 panic("ext2_mkdir: blksize"); 1176 else { 1177 ip->i_size = DIRBLKSIZ; 1178 ip->i_flag |= IN_CHANGE; 1179 } 1180 1181 /* Directory set up, now install its entry in the parent directory. */ 1182 error = ext2_direnter(ip, dvp, cnp); 1183 if (error) { 1184 dp->i_nlink--; 1185 dp->i_flag |= IN_CHANGE; 1186 } 1187 bad: 1188 /* 1189 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1190 * for us because we set the link count to 0. 1191 */ 1192 if (error) { 1193 ip->i_nlink = 0; 1194 ip->i_flag |= IN_CHANGE; 1195 vput(tvp); 1196 } else 1197 *ap->a_vpp = tvp; 1198 out: 1199 return (error); 1200 #undef DIRBLKSIZ 1201 #define DIRBLKSIZ DEV_BSIZE 1202 } 1203 1204 /* 1205 * Rmdir system call. 1206 */ 1207 static int 1208 ext2_rmdir(struct vop_rmdir_args *ap) 1209 { 1210 struct vnode *vp = ap->a_vp; 1211 struct vnode *dvp = ap->a_dvp; 1212 struct componentname *cnp = ap->a_cnp; 1213 struct inode *ip, *dp; 1214 int error; 1215 1216 ip = VTOI(vp); 1217 dp = VTOI(dvp); 1218 1219 /* 1220 * Verify the directory is empty (and valid). 1221 * (Rmdir ".." won't be valid since 1222 * ".." will contain a reference to 1223 * the current directory and thus be 1224 * non-empty.) 1225 */ 1226 error = 0; 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 inode *ip; 1333 struct bufobj *bo; 1334 daddr_t blkno; 1335 int error; 1336 1337 ip = VTOI(vp); 1338 if (vp->v_type == VBLK || vp->v_type == VCHR) 1339 panic("ext2_strategy: spec"); 1340 if (bp->b_blkno == bp->b_lblkno) { 1341 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1342 bp->b_blkno = blkno; 1343 if (error) { 1344 bp->b_error = error; 1345 bp->b_ioflags |= BIO_ERROR; 1346 bufdone(bp); 1347 return (0); 1348 } 1349 if ((long)bp->b_blkno == -1) 1350 vfs_bio_clrbuf(bp); 1351 } 1352 if ((long)bp->b_blkno == -1) { 1353 bufdone(bp); 1354 return (0); 1355 } 1356 bp->b_iooffset = dbtob(bp->b_blkno); 1357 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1358 BO_STRATEGY(bo, bp); 1359 return (0); 1360 } 1361 1362 /* 1363 * Print out the contents of an inode. 1364 */ 1365 static int 1366 ext2_print(struct vop_print_args *ap) 1367 { 1368 struct vnode *vp = ap->a_vp; 1369 struct inode *ip = VTOI(vp); 1370 1371 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number); 1372 if (vp->v_type == VFIFO) 1373 fifo_printinfo(vp); 1374 printf("\n"); 1375 return (0); 1376 } 1377 1378 /* 1379 * Close wrapper for fifos. 1380 * 1381 * Update the times on the inode then do device close. 1382 */ 1383 static int 1384 ext2fifo_close(struct vop_close_args *ap) 1385 { 1386 struct vnode *vp = ap->a_vp; 1387 1388 VI_LOCK(vp); 1389 if (vp->v_usecount > 1) 1390 ext2_itimes_locked(vp); 1391 VI_UNLOCK(vp); 1392 return (fifo_specops.vop_close(ap)); 1393 } 1394 1395 /* 1396 * Kqfilter wrapper for fifos. 1397 * 1398 * Fall through to ext2 kqfilter routines if needed 1399 */ 1400 static int 1401 ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1402 { 1403 int error; 1404 1405 error = fifo_specops.vop_kqfilter(ap); 1406 if (error) 1407 error = vfs_kqfilter(ap); 1408 return (error); 1409 } 1410 1411 /* 1412 * Return POSIX pathconf information applicable to ext2 filesystems. 1413 */ 1414 static int 1415 ext2_pathconf(struct vop_pathconf_args *ap) 1416 { 1417 int error = 0; 1418 1419 switch (ap->a_name) { 1420 case _PC_LINK_MAX: 1421 *ap->a_retval = EXT2_LINK_MAX; 1422 break; 1423 case _PC_NAME_MAX: 1424 *ap->a_retval = NAME_MAX; 1425 break; 1426 case _PC_PATH_MAX: 1427 *ap->a_retval = PATH_MAX; 1428 break; 1429 case _PC_PIPE_BUF: 1430 *ap->a_retval = PIPE_BUF; 1431 break; 1432 case _PC_CHOWN_RESTRICTED: 1433 *ap->a_retval = 1; 1434 break; 1435 case _PC_NO_TRUNC: 1436 *ap->a_retval = 1; 1437 break; 1438 case _PC_MIN_HOLE_SIZE: 1439 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1440 break; 1441 case _PC_ASYNC_IO: 1442 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1443 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1444 error = EINVAL; 1445 break; 1446 case _PC_PRIO_IO: 1447 *ap->a_retval = 0; 1448 break; 1449 case _PC_SYNC_IO: 1450 *ap->a_retval = 0; 1451 break; 1452 case _PC_ALLOC_SIZE_MIN: 1453 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1454 break; 1455 case _PC_FILESIZEBITS: 1456 *ap->a_retval = 64; 1457 break; 1458 case _PC_REC_INCR_XFER_SIZE: 1459 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1460 break; 1461 case _PC_REC_MAX_XFER_SIZE: 1462 *ap->a_retval = -1; /* means ``unlimited'' */ 1463 break; 1464 case _PC_REC_MIN_XFER_SIZE: 1465 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1466 break; 1467 case _PC_REC_XFER_ALIGN: 1468 *ap->a_retval = PAGE_SIZE; 1469 break; 1470 case _PC_SYMLINK_MAX: 1471 *ap->a_retval = MAXPATHLEN; 1472 break; 1473 1474 default: 1475 error = EINVAL; 1476 break; 1477 } 1478 return (error); 1479 } 1480 1481 /* 1482 * Vnode pointer to File handle 1483 */ 1484 /* ARGSUSED */ 1485 static int 1486 ext2_vptofh(struct vop_vptofh_args *ap) 1487 { 1488 struct inode *ip; 1489 struct ufid *ufhp; 1490 1491 ip = VTOI(ap->a_vp); 1492 ufhp = (struct ufid *)ap->a_fhp; 1493 ufhp->ufid_len = sizeof(struct ufid); 1494 ufhp->ufid_ino = ip->i_number; 1495 ufhp->ufid_gen = ip->i_gen; 1496 return (0); 1497 } 1498 1499 /* 1500 * Initialize the vnode associated with a new inode, handle aliased 1501 * vnodes. 1502 */ 1503 int 1504 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1505 { 1506 struct inode *ip; 1507 struct vnode *vp; 1508 1509 vp = *vpp; 1510 ip = VTOI(vp); 1511 vp->v_type = IFTOVT(ip->i_mode); 1512 if (vp->v_type == VFIFO) 1513 vp->v_op = fifoops; 1514 1515 if (ip->i_number == EXT2_ROOTINO) 1516 vp->v_vflag |= VV_ROOT; 1517 ip->i_modrev = init_va_filerev(); 1518 *vpp = vp; 1519 return (0); 1520 } 1521 1522 /* 1523 * Allocate a new inode. 1524 */ 1525 static int 1526 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1527 struct componentname *cnp) 1528 { 1529 struct inode *ip, *pdir; 1530 struct vnode *tvp; 1531 int error; 1532 1533 pdir = VTOI(dvp); 1534 #ifdef INVARIANTS 1535 if ((cnp->cn_flags & HASBUF) == 0) 1536 panic("ext2_makeinode: no name"); 1537 #endif 1538 *vpp = NULL; 1539 if ((mode & IFMT) == 0) 1540 mode |= IFREG; 1541 1542 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1543 if (error) { 1544 return (error); 1545 } 1546 ip = VTOI(tvp); 1547 ip->i_gid = pdir->i_gid; 1548 #ifdef SUIDDIR 1549 { 1550 /* 1551 * if we are 1552 * not the owner of the directory, 1553 * and we are hacking owners here, (only do this where told to) 1554 * and we are not giving it TOO root, (would subvert quotas) 1555 * then go ahead and give it to the other user. 1556 * Note that this drops off the execute bits for security. 1557 */ 1558 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1559 (pdir->i_mode & ISUID) && 1560 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1561 ip->i_uid = pdir->i_uid; 1562 mode &= ~07111; 1563 } else { 1564 ip->i_uid = cnp->cn_cred->cr_uid; 1565 } 1566 } 1567 #else 1568 ip->i_uid = cnp->cn_cred->cr_uid; 1569 #endif 1570 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1571 ip->i_mode = mode; 1572 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1573 ip->i_nlink = 1; 1574 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1575 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1576 ip->i_mode &= ~ISGID; 1577 } 1578 1579 if (cnp->cn_flags & ISWHITEOUT) 1580 ip->i_flags |= UF_OPAQUE; 1581 1582 /* 1583 * Make sure inode goes to disk before directory entry. 1584 */ 1585 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1586 if (error) 1587 goto bad; 1588 error = ext2_direnter(ip, dvp, cnp); 1589 if (error) 1590 goto bad; 1591 1592 *vpp = tvp; 1593 return (0); 1594 1595 bad: 1596 /* 1597 * Write error occurred trying to update the inode 1598 * or the directory so must deallocate the inode. 1599 */ 1600 ip->i_nlink = 0; 1601 ip->i_flag |= IN_CHANGE; 1602 vput(tvp); 1603 return (error); 1604 } 1605 1606 /* 1607 * Vnode op for reading. 1608 */ 1609 static int 1610 ext2_read(struct vop_read_args *ap) 1611 { 1612 struct vnode *vp; 1613 struct inode *ip; 1614 int error; 1615 1616 vp = ap->a_vp; 1617 ip = VTOI(vp); 1618 1619 /*EXT4_EXT_LOCK(ip);*/ 1620 if (ip->i_flags & E4_EXTENTS) 1621 error = ext4_ext_read(ap); 1622 else 1623 error = ext2_ind_read(ap); 1624 /*EXT4_EXT_UNLOCK(ip);*/ 1625 return (error); 1626 } 1627 1628 1629 /* 1630 * Vnode op for reading. 1631 */ 1632 static int 1633 ext2_ind_read(struct vop_read_args *ap) 1634 { 1635 struct vnode *vp; 1636 struct inode *ip; 1637 struct uio *uio; 1638 struct m_ext2fs *fs; 1639 struct buf *bp; 1640 daddr_t lbn, nextlbn; 1641 off_t bytesinfile; 1642 long size, xfersize, blkoffset; 1643 int error, orig_resid, seqcount; 1644 int ioflag; 1645 1646 vp = ap->a_vp; 1647 uio = ap->a_uio; 1648 ioflag = ap->a_ioflag; 1649 1650 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1651 ip = VTOI(vp); 1652 1653 #ifdef INVARIANTS 1654 if (uio->uio_rw != UIO_READ) 1655 panic("%s: mode", "ext2_read"); 1656 1657 if (vp->v_type == VLNK) { 1658 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1659 panic("%s: short symlink", "ext2_read"); 1660 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1661 panic("%s: type %d", "ext2_read", vp->v_type); 1662 #endif 1663 orig_resid = uio->uio_resid; 1664 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1665 if (orig_resid == 0) 1666 return (0); 1667 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1668 fs = ip->i_e2fs; 1669 if (uio->uio_offset < ip->i_size && 1670 uio->uio_offset >= fs->e2fs_maxfilesize) 1671 return (EOVERFLOW); 1672 1673 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1674 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1675 break; 1676 lbn = lblkno(fs, uio->uio_offset); 1677 nextlbn = lbn + 1; 1678 size = blksize(fs, ip, lbn); 1679 blkoffset = blkoff(fs, uio->uio_offset); 1680 1681 xfersize = fs->e2fs_fsize - blkoffset; 1682 if (uio->uio_resid < xfersize) 1683 xfersize = uio->uio_resid; 1684 if (bytesinfile < xfersize) 1685 xfersize = bytesinfile; 1686 1687 if (lblktosize(fs, nextlbn) >= ip->i_size) 1688 error = bread(vp, lbn, size, NOCRED, &bp); 1689 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 1690 error = cluster_read(vp, ip->i_size, lbn, size, 1691 NOCRED, blkoffset + uio->uio_resid, seqcount, 1692 0, &bp); 1693 } else if (seqcount > 1) { 1694 u_int nextsize = blksize(fs, ip, nextlbn); 1695 error = breadn(vp, lbn, 1696 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1697 } else 1698 error = bread(vp, lbn, size, NOCRED, &bp); 1699 if (error) { 1700 brelse(bp); 1701 bp = NULL; 1702 break; 1703 } 1704 1705 /* 1706 * If IO_DIRECT then set B_DIRECT for the buffer. This 1707 * will cause us to attempt to release the buffer later on 1708 * and will cause the buffer cache to attempt to free the 1709 * underlying pages. 1710 */ 1711 if (ioflag & IO_DIRECT) 1712 bp->b_flags |= B_DIRECT; 1713 1714 /* 1715 * We should only get non-zero b_resid when an I/O error 1716 * has occurred, which should cause us to break above. 1717 * However, if the short read did not cause an error, 1718 * then we want to ensure that we do not uiomove bad 1719 * or uninitialized data. 1720 */ 1721 size -= bp->b_resid; 1722 if (size < xfersize) { 1723 if (size == 0) 1724 break; 1725 xfersize = size; 1726 } 1727 error = uiomove((char *)bp->b_data + blkoffset, 1728 (int)xfersize, uio); 1729 if (error) 1730 break; 1731 1732 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1733 /* 1734 * If it's VMIO or direct I/O, then we don't 1735 * need the buf, mark it available for 1736 * freeing. If it's non-direct VMIO, the VM has 1737 * the data. 1738 */ 1739 bp->b_flags |= B_RELBUF; 1740 brelse(bp); 1741 } else { 1742 /* 1743 * Otherwise let whoever 1744 * made the request take care of 1745 * freeing it. We just queue 1746 * it onto another list. 1747 */ 1748 bqrelse(bp); 1749 } 1750 } 1751 1752 /* 1753 * This can only happen in the case of an error 1754 * because the loop above resets bp to NULL on each iteration 1755 * and on normal completion has not set a new value into it. 1756 * so it must have come from a 'break' statement 1757 */ 1758 if (bp != NULL) { 1759 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1760 bp->b_flags |= B_RELBUF; 1761 brelse(bp); 1762 } else { 1763 bqrelse(bp); 1764 } 1765 } 1766 1767 if ((error == 0 || uio->uio_resid != orig_resid) && 1768 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1769 ip->i_flag |= IN_ACCESS; 1770 return (error); 1771 } 1772 1773 static int 1774 ext2_ioctl(struct vop_ioctl_args *ap) 1775 { 1776 1777 switch (ap->a_command) { 1778 case FIOSEEKDATA: 1779 case FIOSEEKHOLE: 1780 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1781 (off_t *)ap->a_data, ap->a_cred)); 1782 default: 1783 return (ENOTTY); 1784 } 1785 } 1786 1787 /* 1788 * this function handles ext4 extents block mapping 1789 */ 1790 static int 1791 ext4_ext_read(struct vop_read_args *ap) 1792 { 1793 struct vnode *vp; 1794 struct inode *ip; 1795 struct uio *uio; 1796 struct m_ext2fs *fs; 1797 struct buf *bp; 1798 struct ext4_extent nex, *ep; 1799 struct ext4_extent_path path; 1800 daddr_t lbn, newblk; 1801 off_t bytesinfile; 1802 int cache_type; 1803 ssize_t orig_resid; 1804 int error; 1805 long size, xfersize, blkoffset; 1806 1807 vp = ap->a_vp; 1808 ip = VTOI(vp); 1809 uio = ap->a_uio; 1810 memset(&path, 0, sizeof(path)); 1811 1812 orig_resid = uio->uio_resid; 1813 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1814 if (orig_resid == 0) 1815 return (0); 1816 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1817 fs = ip->i_e2fs; 1818 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1819 return (EOVERFLOW); 1820 1821 while (uio->uio_resid > 0) { 1822 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1823 break; 1824 lbn = lblkno(fs, uio->uio_offset); 1825 size = blksize(fs, ip, lbn); 1826 blkoffset = blkoff(fs, uio->uio_offset); 1827 1828 xfersize = fs->e2fs_fsize - blkoffset; 1829 xfersize = MIN(xfersize, uio->uio_resid); 1830 xfersize = MIN(xfersize, bytesinfile); 1831 1832 /* get block from ext4 extent cache */ 1833 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1834 switch (cache_type) { 1835 case EXT4_EXT_CACHE_NO: 1836 ext4_ext_find_extent(fs, ip, lbn, &path); 1837 ep = path.ep_ext; 1838 if (ep == NULL) 1839 return (EIO); 1840 1841 ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN); 1842 1843 newblk = lbn - ep->e_blk + (ep->e_start_lo | 1844 (daddr_t)ep->e_start_hi << 32); 1845 1846 if (path.ep_bp != NULL) { 1847 brelse(path.ep_bp); 1848 path.ep_bp = NULL; 1849 } 1850 break; 1851 1852 case EXT4_EXT_CACHE_GAP: 1853 /* block has not been allocated yet */ 1854 return (0); 1855 1856 case EXT4_EXT_CACHE_IN: 1857 newblk = lbn - nex.e_blk + (nex.e_start_lo | 1858 (daddr_t)nex.e_start_hi << 32); 1859 break; 1860 1861 default: 1862 panic("%s: invalid cache type", __func__); 1863 } 1864 1865 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp); 1866 if (error) { 1867 brelse(bp); 1868 return (error); 1869 } 1870 1871 size -= bp->b_resid; 1872 if (size < xfersize) { 1873 if (size == 0) { 1874 bqrelse(bp); 1875 break; 1876 } 1877 xfersize = size; 1878 } 1879 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio); 1880 bqrelse(bp); 1881 if (error) 1882 return (error); 1883 } 1884 1885 return (0); 1886 } 1887 1888 /* 1889 * Vnode op for writing. 1890 */ 1891 static int 1892 ext2_write(struct vop_write_args *ap) 1893 { 1894 struct vnode *vp; 1895 struct uio *uio; 1896 struct inode *ip; 1897 struct m_ext2fs *fs; 1898 struct buf *bp; 1899 daddr_t lbn; 1900 off_t osize; 1901 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 1902 1903 ioflag = ap->a_ioflag; 1904 uio = ap->a_uio; 1905 vp = ap->a_vp; 1906 1907 seqcount = ioflag >> IO_SEQSHIFT; 1908 ip = VTOI(vp); 1909 1910 #ifdef INVARIANTS 1911 if (uio->uio_rw != UIO_WRITE) 1912 panic("%s: mode", "ext2_write"); 1913 #endif 1914 1915 switch (vp->v_type) { 1916 case VREG: 1917 if (ioflag & IO_APPEND) 1918 uio->uio_offset = ip->i_size; 1919 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 1920 return (EPERM); 1921 /* FALLTHROUGH */ 1922 case VLNK: 1923 break; 1924 case VDIR: 1925 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 1926 if ((ioflag & IO_SYNC) == 0) 1927 panic("ext2_write: nonsync dir write"); 1928 break; 1929 default: 1930 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 1931 vp->v_type, (intmax_t)uio->uio_offset, 1932 (intmax_t)uio->uio_resid); 1933 } 1934 1935 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 1936 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 1937 fs = ip->i_e2fs; 1938 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 1939 return (EFBIG); 1940 /* 1941 * Maybe this should be above the vnode op call, but so long as 1942 * file servers have no limits, I don't think it matters. 1943 */ 1944 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 1945 return (EFBIG); 1946 1947 resid = uio->uio_resid; 1948 osize = ip->i_size; 1949 if (seqcount > BA_SEQMAX) 1950 flags = BA_SEQMAX << BA_SEQSHIFT; 1951 else 1952 flags = seqcount << BA_SEQSHIFT; 1953 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1954 flags |= IO_SYNC; 1955 1956 for (error = 0; uio->uio_resid > 0;) { 1957 lbn = lblkno(fs, uio->uio_offset); 1958 blkoffset = blkoff(fs, uio->uio_offset); 1959 xfersize = fs->e2fs_fsize - blkoffset; 1960 if (uio->uio_resid < xfersize) 1961 xfersize = uio->uio_resid; 1962 if (uio->uio_offset + xfersize > ip->i_size) 1963 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 1964 1965 /* 1966 * We must perform a read-before-write if the transfer size 1967 * does not cover the entire buffer. 1968 */ 1969 if (fs->e2fs_bsize > xfersize) 1970 flags |= BA_CLRBUF; 1971 else 1972 flags &= ~BA_CLRBUF; 1973 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 1974 ap->a_cred, &bp, flags); 1975 if (error != 0) 1976 break; 1977 1978 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 1979 bp->b_flags |= B_NOCACHE; 1980 if (uio->uio_offset + xfersize > ip->i_size) 1981 ip->i_size = uio->uio_offset + xfersize; 1982 size = blksize(fs, ip, lbn) - bp->b_resid; 1983 if (size < xfersize) 1984 xfersize = size; 1985 1986 error = 1987 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1988 /* 1989 * If the buffer is not already filled and we encounter an 1990 * error while trying to fill it, we have to clear out any 1991 * garbage data from the pages instantiated for the buffer. 1992 * If we do not, a failed uiomove() during a write can leave 1993 * the prior contents of the pages exposed to a userland mmap. 1994 * 1995 * Note that we need only clear buffers with a transfer size 1996 * equal to the block size because buffers with a shorter 1997 * transfer size were cleared above by the call to ext2_balloc() 1998 * with the BA_CLRBUF flag set. 1999 * 2000 * If the source region for uiomove identically mmaps the 2001 * buffer, uiomove() performed the NOP copy, and the buffer 2002 * content remains valid because the page fault handler 2003 * validated the pages. 2004 */ 2005 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2006 fs->e2fs_bsize == xfersize) 2007 vfs_bio_clrbuf(bp); 2008 if (ioflag & (IO_VMIO|IO_DIRECT)) { 2009 bp->b_flags |= B_RELBUF; 2010 } 2011 2012 /* 2013 * If IO_SYNC each buffer is written synchronously. Otherwise 2014 * if we have a severe page deficiency write the buffer 2015 * asynchronously. Otherwise try to cluster, and if that 2016 * doesn't do it then either do an async write (if O_DIRECT), 2017 * or a delayed write (if not). 2018 */ 2019 if (ioflag & IO_SYNC) { 2020 (void)bwrite(bp); 2021 } else if (vm_page_count_severe() || 2022 buf_dirty_count_severe() || 2023 (ioflag & IO_ASYNC)) { 2024 bp->b_flags |= B_CLUSTEROK; 2025 bawrite(bp); 2026 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2027 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2028 bp->b_flags |= B_CLUSTEROK; 2029 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2030 } else { 2031 bawrite(bp); 2032 } 2033 } else if (ioflag & IO_DIRECT) { 2034 bp->b_flags |= B_CLUSTEROK; 2035 bawrite(bp); 2036 } else { 2037 bp->b_flags |= B_CLUSTEROK; 2038 bdwrite(bp); 2039 } 2040 if (error || xfersize == 0) 2041 break; 2042 } 2043 /* 2044 * If we successfully wrote any data, and we are not the superuser 2045 * we clear the setuid and setgid bits as a precaution against 2046 * tampering. 2047 */ 2048 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2049 ap->a_cred) { 2050 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2051 ip->i_mode &= ~(ISUID | ISGID); 2052 } 2053 if (error) { 2054 if (ioflag & IO_UNIT) { 2055 (void)ext2_truncate(vp, osize, 2056 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2057 uio->uio_offset -= resid - uio->uio_resid; 2058 uio->uio_resid = resid; 2059 } 2060 } 2061 if (uio->uio_resid != resid) { 2062 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2063 if (ioflag & IO_SYNC) 2064 error = ext2_update(vp, 1); 2065 } 2066 return (error); 2067 } 2068