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 <fs/fifofs/fifo.h> 76 77#include <ufs/ufs/dir.h> 78 79#include <fs/ext2fs/fs.h> 80#include <fs/ext2fs/inode.h> 81#include <fs/ext2fs/ext2_extern.h> 82#include <fs/ext2fs/ext2fs.h> 83#include <fs/ext2fs/ext2_dinode.h> 84#include <fs/ext2fs/ext2_dir.h> 85#include <fs/ext2fs/ext2_mount.h> 86 87static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 88static void ext2_itimes_locked(struct vnode *); 89static int ext4_ext_read(struct vop_read_args *); 90static int ext2_ind_read(struct vop_read_args *); 91 92static vop_access_t ext2_access; 93static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 94static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 95 struct thread *); 96static vop_close_t ext2_close; 97static vop_create_t ext2_create; 98static vop_fsync_t ext2_fsync; 99static vop_getattr_t ext2_getattr; 100static vop_ioctl_t ext2_ioctl; 101static vop_link_t ext2_link; 102static vop_mkdir_t ext2_mkdir; 103static vop_mknod_t ext2_mknod; 104static vop_open_t ext2_open; 105static vop_pathconf_t ext2_pathconf; 106static vop_print_t ext2_print; 107static vop_read_t ext2_read; 108static vop_readlink_t ext2_readlink; 109static vop_remove_t ext2_remove; 110static vop_rename_t ext2_rename; 111static vop_rmdir_t ext2_rmdir; 112static vop_setattr_t ext2_setattr; 113static vop_strategy_t ext2_strategy; 114static vop_symlink_t ext2_symlink; 115static vop_write_t ext2_write; 116static vop_vptofh_t ext2_vptofh; 117static vop_close_t ext2fifo_close; 118static vop_kqfilter_t ext2fifo_kqfilter; 119 120/* Global vfs data structures for ext2. */ 121struct vop_vector ext2_vnodeops = { 122 .vop_default = &default_vnodeops, 123 .vop_access = ext2_access, 124 .vop_bmap = ext2_bmap, 125 .vop_cachedlookup = ext2_lookup, 126 .vop_close = ext2_close, 127 .vop_create = ext2_create, 128 .vop_fsync = ext2_fsync, 129 .vop_getattr = ext2_getattr, 130 .vop_inactive = ext2_inactive, 131 .vop_ioctl = ext2_ioctl, 132 .vop_link = ext2_link, 133 .vop_lookup = vfs_cache_lookup, 134 .vop_mkdir = ext2_mkdir, 135 .vop_mknod = ext2_mknod, 136 .vop_open = ext2_open, 137 .vop_pathconf = ext2_pathconf, 138 .vop_poll = vop_stdpoll, 139 .vop_print = ext2_print, 140 .vop_read = ext2_read, 141 .vop_readdir = ext2_readdir, 142 .vop_readlink = ext2_readlink, 143 .vop_reallocblks = ext2_reallocblks, 144 .vop_reclaim = ext2_reclaim, 145 .vop_remove = ext2_remove, 146 .vop_rename = ext2_rename, 147 .vop_rmdir = ext2_rmdir, 148 .vop_setattr = ext2_setattr, 149 .vop_strategy = ext2_strategy, 150 .vop_symlink = ext2_symlink, 151 .vop_write = ext2_write, 152 .vop_vptofh = ext2_vptofh, 153}; 154 155struct vop_vector ext2_fifoops = { 156 .vop_default = &fifo_specops, 157 .vop_access = ext2_access, 158 .vop_close = ext2fifo_close, 159 .vop_fsync = ext2_fsync, 160 .vop_getattr = ext2_getattr, 161 .vop_inactive = ext2_inactive, 162 .vop_kqfilter = ext2fifo_kqfilter, 163 .vop_print = ext2_print, 164 .vop_read = VOP_PANIC, 165 .vop_reclaim = ext2_reclaim, 166 .vop_setattr = ext2_setattr, 167 .vop_write = VOP_PANIC, 168 .vop_vptofh = ext2_vptofh, 169}; 170 171/* 172 * A virgin directory (no blushing please). 173 * Note that the type and namlen fields are reversed relative to ext2. 174 * Also, we don't use `struct odirtemplate', since it would just cause 175 * endianness problems. 176 */ 177static struct dirtemplate mastertemplate = { 178 0, 12, 1, EXT2_FT_DIR, ".", 179 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 180}; 181static struct dirtemplate omastertemplate = { 182 0, 12, 1, EXT2_FT_UNKNOWN, ".", 183 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 184}; 185 186static void 187ext2_itimes_locked(struct vnode *vp) 188{ 189 struct inode *ip; 190 struct timespec ts; 191 192 ASSERT_VI_LOCKED(vp, __func__); 193 194 ip = VTOI(vp); 195 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 196 return; 197 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 198 ip->i_flag |= IN_LAZYMOD; 199 else 200 ip->i_flag |= IN_MODIFIED; 201 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 202 vfs_timestamp(&ts); 203 if (ip->i_flag & IN_ACCESS) { 204 ip->i_atime = ts.tv_sec; 205 ip->i_atimensec = ts.tv_nsec; 206 } 207 if (ip->i_flag & IN_UPDATE) { 208 ip->i_mtime = ts.tv_sec; 209 ip->i_mtimensec = ts.tv_nsec; 210 ip->i_modrev++; 211 } 212 if (ip->i_flag & IN_CHANGE) { 213 ip->i_ctime = ts.tv_sec; 214 ip->i_ctimensec = ts.tv_nsec; 215 } 216 } 217 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 218} 219 220void 221ext2_itimes(struct vnode *vp) 222{ 223 224 VI_LOCK(vp); 225 ext2_itimes_locked(vp); 226 VI_UNLOCK(vp); 227} 228 229/* 230 * Create a regular file 231 */ 232static int 233ext2_create(struct vop_create_args *ap) 234{ 235 int error; 236 237 error = 238 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 239 ap->a_dvp, ap->a_vpp, ap->a_cnp); 240 if (error) 241 return (error); 242 return (0); 243} 244 245static int 246ext2_open(struct vop_open_args *ap) 247{ 248 249 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 250 return (EOPNOTSUPP); 251 252 /* 253 * Files marked append-only must be opened for appending. 254 */ 255 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 256 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 257 return (EPERM); 258 259 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 260 261 return (0); 262} 263 264/* 265 * Close called. 266 * 267 * Update the times on the inode. 268 */ 269static int 270ext2_close(struct vop_close_args *ap) 271{ 272 struct vnode *vp = ap->a_vp; 273 274 VI_LOCK(vp); 275 if (vp->v_usecount > 1) 276 ext2_itimes_locked(vp); 277 VI_UNLOCK(vp); 278 return (0); 279} 280 281static int 282ext2_access(struct vop_access_args *ap) 283{ 284 struct vnode *vp = ap->a_vp; 285 struct inode *ip = VTOI(vp); 286 accmode_t accmode = ap->a_accmode; 287 int error; 288 289 if (vp->v_type == VBLK || vp->v_type == VCHR) 290 return (EOPNOTSUPP); 291 292 /* 293 * Disallow write attempts on read-only file systems; 294 * unless the file is a socket, fifo, or a block or 295 * character device resident on the file system. 296 */ 297 if (accmode & VWRITE) { 298 switch (vp->v_type) { 299 case VDIR: 300 case VLNK: 301 case VREG: 302 if (vp->v_mount->mnt_flag & MNT_RDONLY) 303 return (EROFS); 304 break; 305 default: 306 break; 307 } 308 } 309 310 /* If immutable bit set, nobody gets to write it. */ 311 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 312 return (EPERM); 313 314 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 315 ap->a_accmode, ap->a_cred, NULL); 316 return (error); 317} 318 319static int 320ext2_getattr(struct vop_getattr_args *ap) 321{ 322 struct vnode *vp = ap->a_vp; 323 struct inode *ip = VTOI(vp); 324 struct vattr *vap = ap->a_vap; 325 326 ext2_itimes(vp); 327 /* 328 * Copy from inode table 329 */ 330 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 331 vap->va_fileid = ip->i_number; 332 vap->va_mode = ip->i_mode & ~IFMT; 333 vap->va_nlink = ip->i_nlink; 334 vap->va_uid = ip->i_uid; 335 vap->va_gid = ip->i_gid; 336 vap->va_rdev = ip->i_rdev; 337 vap->va_size = ip->i_size; 338 vap->va_atime.tv_sec = ip->i_atime; 339 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 340 vap->va_mtime.tv_sec = ip->i_mtime; 341 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 342 vap->va_ctime.tv_sec = ip->i_ctime; 343 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 344 if E2DI_HAS_XTIME(ip) { 345 vap->va_birthtime.tv_sec = ip->i_birthtime; 346 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 347 } 348 vap->va_flags = ip->i_flags; 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 */ 360static int 361ext2_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 & 401 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) { 402 error = securelevel_gt(cred, 0); 403 if (error) 404 return (error); 405 } 406 ip->i_flags = vap->va_flags; 407 } else { 408 if (ip->i_flags & 409 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) || 410 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 411 return (EPERM); 412 ip->i_flags &= SF_SETTABLE; 413 ip->i_flags |= (vap->va_flags & UF_SETTABLE); 414 } 415 ip->i_flag |= IN_CHANGE; 416 if (ip->i_flags & (IMMUTABLE | APPEND)) 417 return (0); 418 } 419 if (ip->i_flags & (IMMUTABLE | APPEND)) 420 return (EPERM); 421 /* 422 * Go through the fields and update iff not VNOVAL. 423 */ 424 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 425 if (vp->v_mount->mnt_flag & MNT_RDONLY) 426 return (EROFS); 427 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 428 td)) != 0) 429 return (error); 430 } 431 if (vap->va_size != VNOVAL) { 432 /* 433 * Disallow write attempts on read-only file systems; 434 * unless the file is a socket, fifo, or a block or 435 * character device resident on the file system. 436 */ 437 switch (vp->v_type) { 438 case VDIR: 439 return (EISDIR); 440 case VLNK: 441 case VREG: 442 if (vp->v_mount->mnt_flag & MNT_RDONLY) 443 return (EROFS); 444 break; 445 default: 446 break; 447 } 448 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 449 return (error); 450 } 451 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 452 if (vp->v_mount->mnt_flag & MNT_RDONLY) 453 return (EROFS); 454 /* 455 * From utimes(2): 456 * If times is NULL, ... The caller must be the owner of 457 * the file, have permission to write the file, or be the 458 * super-user. 459 * If times is non-NULL, ... The caller must be the owner of 460 * the file or be the super-user. 461 */ 462 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 463 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 464 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 465 return (error); 466 if (vap->va_atime.tv_sec != VNOVAL) 467 ip->i_flag |= IN_ACCESS; 468 if (vap->va_mtime.tv_sec != VNOVAL) 469 ip->i_flag |= IN_CHANGE | IN_UPDATE; 470 ext2_itimes(vp); 471 if (vap->va_atime.tv_sec != VNOVAL) { 472 ip->i_atime = vap->va_atime.tv_sec; 473 ip->i_atimensec = vap->va_atime.tv_nsec; 474 } 475 if (vap->va_mtime.tv_sec != VNOVAL) { 476 ip->i_mtime = vap->va_mtime.tv_sec; 477 ip->i_mtimensec = vap->va_mtime.tv_nsec; 478 } 479 ip->i_birthtime = vap->va_birthtime.tv_sec; 480 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 481 error = ext2_update(vp, 0); 482 if (error) 483 return (error); 484 } 485 error = 0; 486 if (vap->va_mode != (mode_t)VNOVAL) { 487 if (vp->v_mount->mnt_flag & MNT_RDONLY) 488 return (EROFS); 489 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 490 } 491 return (error); 492} 493 494/* 495 * Change the mode on a file. 496 * Inode must be locked before calling. 497 */ 498static int 499ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 500{ 501 struct inode *ip = VTOI(vp); 502 int error; 503 504 /* 505 * To modify the permissions on a file, must possess VADMIN 506 * for that file. 507 */ 508 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 509 return (error); 510 /* 511 * Privileged processes may set the sticky bit on non-directories, 512 * as well as set the setgid bit on a file with a group that the 513 * process is not a member of. 514 */ 515 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 516 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 517 if (error) 518 return (EFTYPE); 519 } 520 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 521 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 522 if (error) 523 return (error); 524 } 525 ip->i_mode &= ~ALLPERMS; 526 ip->i_mode |= (mode & ALLPERMS); 527 ip->i_flag |= IN_CHANGE; 528 return (0); 529} 530 531/* 532 * Perform chown operation on inode ip; 533 * inode must be locked prior to call. 534 */ 535static int 536ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 537 struct thread *td) 538{ 539 struct inode *ip = VTOI(vp); 540 uid_t ouid; 541 gid_t ogid; 542 int error = 0; 543 544 if (uid == (uid_t)VNOVAL) 545 uid = ip->i_uid; 546 if (gid == (gid_t)VNOVAL) 547 gid = ip->i_gid; 548 /* 549 * To modify the ownership of a file, must possess VADMIN 550 * for that file. 551 */ 552 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 553 return (error); 554 /* 555 * To change the owner of a file, or change the group of a file 556 * to a group of which we are not a member, the caller must 557 * have privilege. 558 */ 559 if (uid != ip->i_uid || (gid != ip->i_gid && 560 !groupmember(gid, cred))) { 561 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 562 if (error) 563 return (error); 564 } 565 ogid = ip->i_gid; 566 ouid = ip->i_uid; 567 ip->i_gid = gid; 568 ip->i_uid = uid; 569 ip->i_flag |= IN_CHANGE; 570 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 571 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 572 ip->i_mode &= ~(ISUID | ISGID); 573 } 574 return (0); 575} 576 577/* 578 * Synch an open file. 579 */ 580/* ARGSUSED */ 581static int 582ext2_fsync(struct vop_fsync_args *ap) 583{ 584 /* 585 * Flush all dirty buffers associated with a vnode. 586 */ 587 588 vop_stdfsync(ap); 589 590 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 591} 592 593/* 594 * Mknod vnode call 595 */ 596/* ARGSUSED */ 597static int 598ext2_mknod(struct vop_mknod_args *ap) 599{ 600 struct vattr *vap = ap->a_vap; 601 struct vnode **vpp = ap->a_vpp; 602 struct inode *ip; 603 ino_t ino; 604 int error; 605 606 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 607 ap->a_dvp, vpp, ap->a_cnp); 608 if (error) 609 return (error); 610 ip = VTOI(*vpp); 611 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 612 if (vap->va_rdev != VNOVAL) { 613 /* 614 * Want to be able to use this to make badblock 615 * inodes, so don't truncate the dev number. 616 */ 617 ip->i_rdev = vap->va_rdev; 618 } 619 /* 620 * Remove inode, then reload it through VFS_VGET so it is 621 * checked to see if it is an alias of an existing entry in 622 * the inode cache. XXX I don't believe this is necessary now. 623 */ 624 (*vpp)->v_type = VNON; 625 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 626 vgone(*vpp); 627 vput(*vpp); 628 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 629 if (error) { 630 *vpp = NULL; 631 return (error); 632 } 633 return (0); 634} 635 636static int 637ext2_remove(struct vop_remove_args *ap) 638{ 639 struct inode *ip; 640 struct vnode *vp = ap->a_vp; 641 struct vnode *dvp = ap->a_dvp; 642 int error; 643 644 ip = VTOI(vp); 645 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 646 (VTOI(dvp)->i_flags & APPEND)) { 647 error = EPERM; 648 goto out; 649 } 650 error = ext2_dirremove(dvp, ap->a_cnp); 651 if (error == 0) { 652 ip->i_nlink--; 653 ip->i_flag |= IN_CHANGE; 654 } 655out: 656 return (error); 657} 658 659/* 660 * link vnode call 661 */ 662static int 663ext2_link(struct vop_link_args *ap) 664{ 665 struct vnode *vp = ap->a_vp; 666 struct vnode *tdvp = ap->a_tdvp; 667 struct componentname *cnp = ap->a_cnp; 668 struct inode *ip; 669 int error; 670 671#ifdef INVARIANTS 672 if ((cnp->cn_flags & HASBUF) == 0) 673 panic("ext2_link: no name"); 674#endif 675 if (tdvp->v_mount != vp->v_mount) { 676 error = EXDEV; 677 goto out; 678 } 679 ip = VTOI(vp); 680 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 681 error = EMLINK; 682 goto out; 683 } 684 if (ip->i_flags & (IMMUTABLE | APPEND)) { 685 error = EPERM; 686 goto out; 687 } 688 ip->i_nlink++; 689 ip->i_flag |= IN_CHANGE; 690 error = ext2_update(vp, !DOINGASYNC(vp)); 691 if (!error) 692 error = ext2_direnter(ip, tdvp, cnp); 693 if (error) { 694 ip->i_nlink--; 695 ip->i_flag |= IN_CHANGE; 696 } 697out: 698 return (error); 699} 700 701/* 702 * Rename system call. 703 * rename("foo", "bar"); 704 * is essentially 705 * unlink("bar"); 706 * link("foo", "bar"); 707 * unlink("foo"); 708 * but ``atomically''. Can't do full commit without saving state in the 709 * inode on disk which isn't feasible at this time. Best we can do is 710 * always guarantee the target exists. 711 * 712 * Basic algorithm is: 713 * 714 * 1) Bump link count on source while we're linking it to the 715 * target. This also ensure the inode won't be deleted out 716 * from underneath us while we work (it may be truncated by 717 * a concurrent `trunc' or `open' for creation). 718 * 2) Link source to destination. If destination already exists, 719 * delete it first. 720 * 3) Unlink source reference to inode if still around. If a 721 * directory was moved and the parent of the destination 722 * is different from the source, patch the ".." entry in the 723 * directory. 724 */ 725static int 726ext2_rename(struct vop_rename_args *ap) 727{ 728 struct vnode *tvp = ap->a_tvp; 729 struct vnode *tdvp = ap->a_tdvp; 730 struct vnode *fvp = ap->a_fvp; 731 struct vnode *fdvp = ap->a_fdvp; 732 struct componentname *tcnp = ap->a_tcnp; 733 struct componentname *fcnp = ap->a_fcnp; 734 struct inode *ip, *xp, *dp; 735 struct dirtemplate dirbuf; 736 int doingdirectory = 0, oldparent = 0, newparent = 0; 737 int error = 0; 738 u_char namlen; 739 740#ifdef INVARIANTS 741 if ((tcnp->cn_flags & HASBUF) == 0 || 742 (fcnp->cn_flags & HASBUF) == 0) 743 panic("ext2_rename: no name"); 744#endif 745 /* 746 * Check for cross-device rename. 747 */ 748 if ((fvp->v_mount != tdvp->v_mount) || 749 (tvp && (fvp->v_mount != tvp->v_mount))) { 750 error = EXDEV; 751abortit: 752 if (tdvp == tvp) 753 vrele(tdvp); 754 else 755 vput(tdvp); 756 if (tvp) 757 vput(tvp); 758 vrele(fdvp); 759 vrele(fvp); 760 return (error); 761 } 762 763 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 764 (VTOI(tdvp)->i_flags & APPEND))) { 765 error = EPERM; 766 goto abortit; 767 } 768 769 /* 770 * Renaming a file to itself has no effect. The upper layers should 771 * not call us in that case. Temporarily just warn if they do. 772 */ 773 if (fvp == tvp) { 774 printf("ext2_rename: fvp == tvp (can't happen)\n"); 775 error = 0; 776 goto abortit; 777 } 778 779 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 780 goto abortit; 781 dp = VTOI(fdvp); 782 ip = VTOI(fvp); 783 if (ip->i_nlink >= EXT2_LINK_MAX) { 784 VOP_UNLOCK(fvp, 0); 785 error = EMLINK; 786 goto abortit; 787 } 788 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 789 || (dp->i_flags & APPEND)) { 790 VOP_UNLOCK(fvp, 0); 791 error = EPERM; 792 goto abortit; 793 } 794 if ((ip->i_mode & IFMT) == IFDIR) { 795 /* 796 * Avoid ".", "..", and aliases of "." for obvious reasons. 797 */ 798 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 799 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 800 (ip->i_flag & IN_RENAME)) { 801 VOP_UNLOCK(fvp, 0); 802 error = EINVAL; 803 goto abortit; 804 } 805 ip->i_flag |= IN_RENAME; 806 oldparent = dp->i_number; 807 doingdirectory++; 808 } 809 vrele(fdvp); 810 811 /* 812 * When the target exists, both the directory 813 * and target vnodes are returned locked. 814 */ 815 dp = VTOI(tdvp); 816 xp = NULL; 817 if (tvp) 818 xp = VTOI(tvp); 819 820 /* 821 * 1) Bump link count while we're moving stuff 822 * around. If we crash somewhere before 823 * completing our work, the link count 824 * may be wrong, but correctable. 825 */ 826 ip->i_nlink++; 827 ip->i_flag |= IN_CHANGE; 828 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 829 VOP_UNLOCK(fvp, 0); 830 goto bad; 831 } 832 833 /* 834 * If ".." must be changed (ie the directory gets a new 835 * parent) then the source directory must not be in the 836 * directory hierarchy above the target, as this would 837 * orphan everything below the source directory. Also 838 * the user must have write permission in the source so 839 * as to be able to change "..". We must repeat the call 840 * to namei, as the parent directory is unlocked by the 841 * call to checkpath(). 842 */ 843 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 844 VOP_UNLOCK(fvp, 0); 845 if (oldparent != dp->i_number) 846 newparent = dp->i_number; 847 if (doingdirectory && newparent) { 848 if (error) /* write access check above */ 849 goto bad; 850 if (xp != NULL) 851 vput(tvp); 852 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 853 if (error) 854 goto out; 855 VREF(tdvp); 856 error = relookup(tdvp, &tvp, tcnp); 857 if (error) 858 goto out; 859 vrele(tdvp); 860 dp = VTOI(tdvp); 861 xp = NULL; 862 if (tvp) 863 xp = VTOI(tvp); 864 } 865 /* 866 * 2) If target doesn't exist, link the target 867 * to the source and unlink the source. 868 * Otherwise, rewrite the target directory 869 * entry to reference the source inode and 870 * expunge the original entry's existence. 871 */ 872 if (xp == NULL) { 873 if (dp->i_devvp != ip->i_devvp) 874 panic("ext2_rename: EXDEV"); 875 /* 876 * Account for ".." in new directory. 877 * When source and destination have the same 878 * parent we don't fool with the link count. 879 */ 880 if (doingdirectory && newparent) { 881 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 882 error = EMLINK; 883 goto bad; 884 } 885 dp->i_nlink++; 886 dp->i_flag |= IN_CHANGE; 887 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 888 if (error) 889 goto bad; 890 } 891 error = ext2_direnter(ip, tdvp, tcnp); 892 if (error) { 893 if (doingdirectory && newparent) { 894 dp->i_nlink--; 895 dp->i_flag |= IN_CHANGE; 896 (void)ext2_update(tdvp, 1); 897 } 898 goto bad; 899 } 900 vput(tdvp); 901 } else { 902 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 903 panic("ext2_rename: EXDEV"); 904 /* 905 * Short circuit rename(foo, foo). 906 */ 907 if (xp->i_number == ip->i_number) 908 panic("ext2_rename: same file"); 909 /* 910 * If the parent directory is "sticky", then the user must 911 * own the parent directory, or the destination of the rename, 912 * otherwise the destination may not be changed (except by 913 * root). This implements append-only directories. 914 */ 915 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 916 tcnp->cn_cred->cr_uid != dp->i_uid && 917 xp->i_uid != tcnp->cn_cred->cr_uid) { 918 error = EPERM; 919 goto bad; 920 } 921 /* 922 * Target must be empty if a directory and have no links 923 * to it. Also, ensure source and target are compatible 924 * (both directories, or both not directories). 925 */ 926 if ((xp->i_mode&IFMT) == IFDIR) { 927 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 928 xp->i_nlink > 2) { 929 error = ENOTEMPTY; 930 goto bad; 931 } 932 if (!doingdirectory) { 933 error = ENOTDIR; 934 goto bad; 935 } 936 cache_purge(tdvp); 937 } else if (doingdirectory) { 938 error = EISDIR; 939 goto bad; 940 } 941 error = ext2_dirrewrite(dp, ip, tcnp); 942 if (error) 943 goto bad; 944 /* 945 * If the target directory is in the same 946 * directory as the source directory, 947 * decrement the link count on the parent 948 * of the target directory. 949 */ 950 if (doingdirectory && !newparent) { 951 dp->i_nlink--; 952 dp->i_flag |= IN_CHANGE; 953 } 954 vput(tdvp); 955 /* 956 * Adjust the link count of the target to 957 * reflect the dirrewrite above. If this is 958 * a directory it is empty and there are 959 * no links to it, so we can squash the inode and 960 * any space associated with it. We disallowed 961 * renaming over top of a directory with links to 962 * it above, as the remaining link would point to 963 * a directory without "." or ".." entries. 964 */ 965 xp->i_nlink--; 966 if (doingdirectory) { 967 if (--xp->i_nlink != 0) 968 panic("ext2_rename: linked directory"); 969 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 970 tcnp->cn_cred, tcnp->cn_thread); 971 } 972 xp->i_flag |= IN_CHANGE; 973 vput(tvp); 974 xp = NULL; 975 } 976 977 /* 978 * 3) Unlink the source. 979 */ 980 fcnp->cn_flags &= ~MODMASK; 981 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 982 VREF(fdvp); 983 error = relookup(fdvp, &fvp, fcnp); 984 if (error == 0) 985 vrele(fdvp); 986 if (fvp != NULL) { 987 xp = VTOI(fvp); 988 dp = VTOI(fdvp); 989 } else { 990 /* 991 * From name has disappeared. 992 */ 993 if (doingdirectory) 994 panic("ext2_rename: lost dir entry"); 995 vrele(ap->a_fvp); 996 return (0); 997 } 998 /* 999 * Ensure that the directory entry still exists and has not 1000 * changed while the new name has been entered. If the source is 1001 * a file then the entry may have been unlinked or renamed. In 1002 * either case there is no further work to be done. If the source 1003 * is a directory then it cannot have been rmdir'ed; its link 1004 * count of three would cause a rmdir to fail with ENOTEMPTY. 1005 * The IN_RENAME flag ensures that it cannot be moved by another 1006 * rename. 1007 */ 1008 if (xp != ip) { 1009 if (doingdirectory) 1010 panic("ext2_rename: lost dir entry"); 1011 } else { 1012 /* 1013 * If the source is a directory with a 1014 * new parent, the link count of the old 1015 * parent directory must be decremented 1016 * and ".." set to point to the new parent. 1017 */ 1018 if (doingdirectory && newparent) { 1019 dp->i_nlink--; 1020 dp->i_flag |= IN_CHANGE; 1021 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1022 sizeof(struct dirtemplate), (off_t)0, 1023 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1024 tcnp->cn_cred, NOCRED, NULL, NULL); 1025 if (error == 0) { 1026 /* Like ufs little-endian: */ 1027 namlen = dirbuf.dotdot_type; 1028 if (namlen != 2 || 1029 dirbuf.dotdot_name[0] != '.' || 1030 dirbuf.dotdot_name[1] != '.') { 1031 ext2_dirbad(xp, (doff_t)12, 1032 "rename: mangled dir"); 1033 } else { 1034 dirbuf.dotdot_ino = newparent; 1035 (void) vn_rdwr(UIO_WRITE, fvp, 1036 (caddr_t)&dirbuf, 1037 sizeof(struct dirtemplate), 1038 (off_t)0, UIO_SYSSPACE, 1039 IO_NODELOCKED | IO_SYNC | 1040 IO_NOMACCHECK, tcnp->cn_cred, 1041 NOCRED, NULL, NULL); 1042 cache_purge(fdvp); 1043 } 1044 } 1045 } 1046 error = ext2_dirremove(fdvp, fcnp); 1047 if (!error) { 1048 xp->i_nlink--; 1049 xp->i_flag |= IN_CHANGE; 1050 } 1051 xp->i_flag &= ~IN_RENAME; 1052 } 1053 if (dp) 1054 vput(fdvp); 1055 if (xp) 1056 vput(fvp); 1057 vrele(ap->a_fvp); 1058 return (error); 1059 1060bad: 1061 if (xp) 1062 vput(ITOV(xp)); 1063 vput(ITOV(dp)); 1064out: 1065 if (doingdirectory) 1066 ip->i_flag &= ~IN_RENAME; 1067 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1068 ip->i_nlink--; 1069 ip->i_flag |= IN_CHANGE; 1070 ip->i_flag &= ~IN_RENAME; 1071 vput(fvp); 1072 } else 1073 vrele(fvp); 1074 return (error); 1075} 1076 1077/* 1078 * Mkdir system call 1079 */ 1080static int 1081ext2_mkdir(struct vop_mkdir_args *ap) 1082{ 1083 struct vnode *dvp = ap->a_dvp; 1084 struct vattr *vap = ap->a_vap; 1085 struct componentname *cnp = ap->a_cnp; 1086 struct inode *ip, *dp; 1087 struct vnode *tvp; 1088 struct dirtemplate dirtemplate, *dtp; 1089 int error, dmode; 1090 1091#ifdef INVARIANTS 1092 if ((cnp->cn_flags & HASBUF) == 0) 1093 panic("ext2_mkdir: no name"); 1094#endif 1095 dp = VTOI(dvp); 1096 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1097 error = EMLINK; 1098 goto out; 1099 } 1100 dmode = vap->va_mode & 0777; 1101 dmode |= IFDIR; 1102 /* 1103 * Must simulate part of ext2_makeinode here to acquire the inode, 1104 * but not have it entered in the parent directory. The entry is 1105 * made later after writing "." and ".." entries. 1106 */ 1107 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1108 if (error) 1109 goto out; 1110 ip = VTOI(tvp); 1111 ip->i_gid = dp->i_gid; 1112#ifdef SUIDDIR 1113 { 1114 /* 1115 * if we are hacking owners here, (only do this where told to) 1116 * and we are not giving it TOO root, (would subvert quotas) 1117 * then go ahead and give it to the other user. 1118 * The new directory also inherits the SUID bit. 1119 * If user's UID and dir UID are the same, 1120 * 'give it away' so that the SUID is still forced on. 1121 */ 1122 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1123 (dp->i_mode & ISUID) && dp->i_uid) { 1124 dmode |= ISUID; 1125 ip->i_uid = dp->i_uid; 1126 } else { 1127 ip->i_uid = cnp->cn_cred->cr_uid; 1128 } 1129 } 1130#else 1131 ip->i_uid = cnp->cn_cred->cr_uid; 1132#endif 1133 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1134 ip->i_mode = dmode; 1135 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1136 ip->i_nlink = 2; 1137 if (cnp->cn_flags & ISWHITEOUT) 1138 ip->i_flags |= UF_OPAQUE; 1139 error = ext2_update(tvp, 1); 1140 1141 /* 1142 * Bump link count in parent directory 1143 * to reflect work done below. Should 1144 * be done before reference is created 1145 * so reparation is possible if we crash. 1146 */ 1147 dp->i_nlink++; 1148 dp->i_flag |= IN_CHANGE; 1149 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1150 if (error) 1151 goto bad; 1152 1153 /* Initialize directory with "." and ".." from static template. */ 1154 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1155 EXT2F_INCOMPAT_FTYPE)) 1156 dtp = &mastertemplate; 1157 else 1158 dtp = &omastertemplate; 1159 dirtemplate = *dtp; 1160 dirtemplate.dot_ino = ip->i_number; 1161 dirtemplate.dotdot_ino = dp->i_number; 1162 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1163 * so let's just redefine it - for this function only 1164 */ 1165#undef DIRBLKSIZ 1166#define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1167 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1168 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1169 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1170 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1171 NULL, NULL); 1172 if (error) { 1173 dp->i_nlink--; 1174 dp->i_flag |= IN_CHANGE; 1175 goto bad; 1176 } 1177 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1178 /* XXX should grow with balloc() */ 1179 panic("ext2_mkdir: blksize"); 1180 else { 1181 ip->i_size = DIRBLKSIZ; 1182 ip->i_flag |= IN_CHANGE; 1183 } 1184 1185 /* Directory set up, now install its entry in the parent directory. */ 1186 error = ext2_direnter(ip, dvp, cnp); 1187 if (error) { 1188 dp->i_nlink--; 1189 dp->i_flag |= IN_CHANGE; 1190 } 1191bad: 1192 /* 1193 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1194 * for us because we set the link count to 0. 1195 */ 1196 if (error) { 1197 ip->i_nlink = 0; 1198 ip->i_flag |= IN_CHANGE; 1199 vput(tvp); 1200 } else 1201 *ap->a_vpp = tvp; 1202out: 1203 return (error); 1204#undef DIRBLKSIZ 1205#define DIRBLKSIZ DEV_BSIZE 1206} 1207 1208/* 1209 * Rmdir system call. 1210 */ 1211static int 1212ext2_rmdir(struct vop_rmdir_args *ap) 1213{ 1214 struct vnode *vp = ap->a_vp; 1215 struct vnode *dvp = ap->a_dvp; 1216 struct componentname *cnp = ap->a_cnp; 1217 struct inode *ip, *dp; 1218 int error; 1219 1220 ip = VTOI(vp); 1221 dp = VTOI(dvp); 1222 1223 /* 1224 * Verify the directory is empty (and valid). 1225 * (Rmdir ".." won't be valid since 1226 * ".." will contain a reference to 1227 * the current directory and thus be 1228 * non-empty.) 1229 */ 1230 error = 0; 1231 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1232 error = ENOTEMPTY; 1233 goto out; 1234 } 1235 if ((dp->i_flags & APPEND) 1236 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1237 error = EPERM; 1238 goto out; 1239 } 1240 /* 1241 * Delete reference to directory before purging 1242 * inode. If we crash in between, the directory 1243 * will be reattached to lost+found, 1244 */ 1245 error = ext2_dirremove(dvp, cnp); 1246 if (error) 1247 goto out; 1248 dp->i_nlink--; 1249 dp->i_flag |= IN_CHANGE; 1250 cache_purge(dvp); 1251 VOP_UNLOCK(dvp, 0); 1252 /* 1253 * Truncate inode. The only stuff left 1254 * in the directory is "." and "..". The 1255 * "." reference is inconsequential since 1256 * we're quashing it. The ".." reference 1257 * has already been adjusted above. We've 1258 * removed the "." reference and the reference 1259 * in the parent directory, but there may be 1260 * other hard links so decrement by 2 and 1261 * worry about them later. 1262 */ 1263 ip->i_nlink -= 2; 1264 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1265 cnp->cn_thread); 1266 cache_purge(ITOV(ip)); 1267 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1268 VOP_UNLOCK(vp, 0); 1269 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1270 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1271 } 1272out: 1273 return (error); 1274} 1275 1276/* 1277 * symlink -- make a symbolic link 1278 */ 1279static int 1280ext2_symlink(struct vop_symlink_args *ap) 1281{ 1282 struct vnode *vp, **vpp = ap->a_vpp; 1283 struct inode *ip; 1284 int len, error; 1285 1286 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1287 vpp, ap->a_cnp); 1288 if (error) 1289 return (error); 1290 vp = *vpp; 1291 len = strlen(ap->a_target); 1292 if (len < vp->v_mount->mnt_maxsymlinklen) { 1293 ip = VTOI(vp); 1294 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1295 ip->i_size = len; 1296 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1297 } else 1298 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1299 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1300 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1301 if (error) 1302 vput(vp); 1303 return (error); 1304} 1305 1306/* 1307 * Return target name of a symbolic link 1308 */ 1309static int 1310ext2_readlink(struct vop_readlink_args *ap) 1311{ 1312 struct vnode *vp = ap->a_vp; 1313 struct inode *ip = VTOI(vp); 1314 int isize; 1315 1316 isize = ip->i_size; 1317 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1318 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1319 return (0); 1320 } 1321 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1322} 1323 1324/* 1325 * Calculate the logical to physical mapping if not done already, 1326 * then call the device strategy routine. 1327 * 1328 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1329 * deadlock on memory. See ext2_bmap() for details. 1330 */ 1331static int 1332ext2_strategy(struct vop_strategy_args *ap) 1333{ 1334 struct buf *bp = ap->a_bp; 1335 struct vnode *vp = ap->a_vp; 1336 struct inode *ip; 1337 struct bufobj *bo; 1338 daddr_t blkno; 1339 int error; 1340 1341 ip = VTOI(vp); 1342 if (vp->v_type == VBLK || vp->v_type == VCHR) 1343 panic("ext2_strategy: spec"); 1344 if (bp->b_blkno == bp->b_lblkno) { 1345 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1346 bp->b_blkno = blkno; 1347 if (error) { 1348 bp->b_error = error; 1349 bp->b_ioflags |= BIO_ERROR; 1350 bufdone(bp); 1351 return (0); 1352 } 1353 if ((long)bp->b_blkno == -1) 1354 vfs_bio_clrbuf(bp); 1355 } 1356 if ((long)bp->b_blkno == -1) { 1357 bufdone(bp); 1358 return (0); 1359 } 1360 bp->b_iooffset = dbtob(bp->b_blkno); 1361 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1362 BO_STRATEGY(bo, bp); 1363 return (0); 1364} 1365 1366/* 1367 * Print out the contents of an inode. 1368 */ 1369static int 1370ext2_print(struct vop_print_args *ap) 1371{ 1372 struct vnode *vp = ap->a_vp; 1373 struct inode *ip = VTOI(vp); 1374 1375 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number); 1376 if (vp->v_type == VFIFO) 1377 fifo_printinfo(vp); 1378 printf("\n"); 1379 return (0); 1380} 1381 1382/* 1383 * Close wrapper for fifos. 1384 * 1385 * Update the times on the inode then do device close. 1386 */ 1387static int 1388ext2fifo_close(struct vop_close_args *ap) 1389{ 1390 struct vnode *vp = ap->a_vp; 1391 1392 VI_LOCK(vp); 1393 if (vp->v_usecount > 1) 1394 ext2_itimes_locked(vp); 1395 VI_UNLOCK(vp); 1396 return (fifo_specops.vop_close(ap)); 1397} 1398 1399/* 1400 * Kqfilter wrapper for fifos. 1401 * 1402 * Fall through to ext2 kqfilter routines if needed 1403 */ 1404static int 1405ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1406{ 1407 int error; 1408 1409 error = fifo_specops.vop_kqfilter(ap); 1410 if (error) 1411 error = vfs_kqfilter(ap); 1412 return (error); 1413} 1414 1415/* 1416 * Return POSIX pathconf information applicable to ext2 filesystems. 1417 */ 1418static int 1419ext2_pathconf(struct vop_pathconf_args *ap) 1420{ 1421 int error = 0; 1422 1423 switch (ap->a_name) { 1424 case _PC_LINK_MAX: 1425 *ap->a_retval = EXT2_LINK_MAX; 1426 break; 1427 case _PC_NAME_MAX: 1428 *ap->a_retval = NAME_MAX; 1429 break; 1430 case _PC_PATH_MAX: 1431 *ap->a_retval = PATH_MAX; 1432 break; 1433 case _PC_PIPE_BUF: 1434 *ap->a_retval = PIPE_BUF; 1435 break; 1436 case _PC_CHOWN_RESTRICTED: 1437 *ap->a_retval = 1; 1438 break; 1439 case _PC_NO_TRUNC: 1440 *ap->a_retval = 1; 1441 break; 1442 case _PC_MIN_HOLE_SIZE: 1443 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1444 break; 1445 case _PC_ASYNC_IO: 1446 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1447 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1448 error = EINVAL; 1449 break; 1450 case _PC_PRIO_IO: 1451 *ap->a_retval = 0; 1452 break; 1453 case _PC_SYNC_IO: 1454 *ap->a_retval = 0; 1455 break; 1456 case _PC_ALLOC_SIZE_MIN: 1457 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1458 break; 1459 case _PC_FILESIZEBITS: 1460 *ap->a_retval = 64; 1461 break; 1462 case _PC_REC_INCR_XFER_SIZE: 1463 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1464 break; 1465 case _PC_REC_MAX_XFER_SIZE: 1466 *ap->a_retval = -1; /* means ``unlimited'' */ 1467 break; 1468 case _PC_REC_MIN_XFER_SIZE: 1469 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1470 break; 1471 case _PC_REC_XFER_ALIGN: 1472 *ap->a_retval = PAGE_SIZE; 1473 break; 1474 case _PC_SYMLINK_MAX: 1475 *ap->a_retval = MAXPATHLEN; 1476 break; 1477 1478 default: 1479 error = EINVAL; 1480 break; 1481 } 1482 return (error); 1483} 1484 1485/* 1486 * Vnode pointer to File handle 1487 */ 1488/* ARGSUSED */ 1489static int 1490ext2_vptofh(struct vop_vptofh_args *ap) 1491{ 1492 struct inode *ip; 1493 struct ufid *ufhp; 1494 1495 ip = VTOI(ap->a_vp); 1496 ufhp = (struct ufid *)ap->a_fhp; 1497 ufhp->ufid_len = sizeof(struct ufid); 1498 ufhp->ufid_ino = ip->i_number; 1499 ufhp->ufid_gen = ip->i_gen; 1500 return (0); 1501} 1502 1503/* 1504 * Initialize the vnode associated with a new inode, handle aliased 1505 * vnodes. 1506 */ 1507int 1508ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1509{ 1510 struct inode *ip; 1511 struct vnode *vp; 1512 1513 vp = *vpp; 1514 ip = VTOI(vp); 1515 vp->v_type = IFTOVT(ip->i_mode); 1516 if (vp->v_type == VFIFO) 1517 vp->v_op = fifoops; 1518 1519 if (ip->i_number == EXT2_ROOTINO) 1520 vp->v_vflag |= VV_ROOT; 1521 ip->i_modrev = init_va_filerev(); 1522 *vpp = vp; 1523 return (0); 1524} 1525 1526/* 1527 * Allocate a new inode. 1528 */ 1529static int 1530ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1531 struct componentname *cnp) 1532{ 1533 struct inode *ip, *pdir; 1534 struct vnode *tvp; 1535 int error; 1536 1537 pdir = VTOI(dvp); 1538#ifdef INVARIANTS 1539 if ((cnp->cn_flags & HASBUF) == 0) 1540 panic("ext2_makeinode: no name"); 1541#endif 1542 *vpp = NULL; 1543 if ((mode & IFMT) == 0) 1544 mode |= IFREG; 1545 1546 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1547 if (error) { 1548 return (error); 1549 } 1550 ip = VTOI(tvp); 1551 ip->i_gid = pdir->i_gid; 1552#ifdef SUIDDIR 1553 { 1554 /* 1555 * if we are 1556 * not the owner of the directory, 1557 * and we are hacking owners here, (only do this where told to) 1558 * and we are not giving it TOO root, (would subvert quotas) 1559 * then go ahead and give it to the other user. 1560 * Note that this drops off the execute bits for security. 1561 */ 1562 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1563 (pdir->i_mode & ISUID) && 1564 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1565 ip->i_uid = pdir->i_uid; 1566 mode &= ~07111; 1567 } else { 1568 ip->i_uid = cnp->cn_cred->cr_uid; 1569 } 1570 } 1571#else 1572 ip->i_uid = cnp->cn_cred->cr_uid; 1573#endif 1574 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1575 ip->i_mode = mode; 1576 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1577 ip->i_nlink = 1; 1578 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1579 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1580 ip->i_mode &= ~ISGID; 1581 } 1582 1583 if (cnp->cn_flags & ISWHITEOUT) 1584 ip->i_flags |= UF_OPAQUE; 1585 1586 /* 1587 * Make sure inode goes to disk before directory entry. 1588 */ 1589 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1590 if (error) 1591 goto bad; 1592 error = ext2_direnter(ip, dvp, cnp); 1593 if (error) 1594 goto bad; 1595 1596 *vpp = tvp; 1597 return (0); 1598 1599bad: 1600 /* 1601 * Write error occurred trying to update the inode 1602 * or the directory so must deallocate the inode. 1603 */ 1604 ip->i_nlink = 0; 1605 ip->i_flag |= IN_CHANGE; 1606 vput(tvp); 1607 return (error); 1608} 1609 1610/* 1611 * Vnode op for reading. 1612 */ 1613static int 1614ext2_read(struct vop_read_args *ap) 1615{ 1616 struct vnode *vp; 1617 struct inode *ip; 1618 int error; 1619 1620 vp = ap->a_vp; 1621 ip = VTOI(vp); 1622 1623 /*EXT4_EXT_LOCK(ip);*/ 1624 if (ip->i_flag & IN_E4EXTENTS) 1625 error = ext4_ext_read(ap); 1626 else 1627 error = ext2_ind_read(ap); 1628 /*EXT4_EXT_UNLOCK(ip);*/ 1629 return (error); 1630} 1631 1632/* 1633 * Vnode op for reading. 1634 */ 1635static int 1636ext2_ind_read(struct vop_read_args *ap) 1637{ 1638 struct vnode *vp; 1639 struct inode *ip; 1640 struct uio *uio; 1641 struct m_ext2fs *fs; 1642 struct buf *bp; 1643 daddr_t lbn, nextlbn; 1644 off_t bytesinfile; 1645 long size, xfersize, blkoffset; 1646 int error, orig_resid, seqcount; 1647 int ioflag; 1648 1649 vp = ap->a_vp; 1650 uio = ap->a_uio; 1651 ioflag = ap->a_ioflag; 1652 1653 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1654 ip = VTOI(vp); 1655 1656#ifdef INVARIANTS 1657 if (uio->uio_rw != UIO_READ) 1658 panic("%s: mode", "ext2_read"); 1659 1660 if (vp->v_type == VLNK) { 1661 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1662 panic("%s: short symlink", "ext2_read"); 1663 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1664 panic("%s: type %d", "ext2_read", vp->v_type); 1665#endif 1666 orig_resid = uio->uio_resid; 1667 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1668 if (orig_resid == 0) 1669 return (0); 1670 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1671 fs = ip->i_e2fs; 1672 if (uio->uio_offset < ip->i_size && 1673 uio->uio_offset >= fs->e2fs_maxfilesize) 1674 return (EOVERFLOW); 1675 1676 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1677 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1678 break; 1679 lbn = lblkno(fs, uio->uio_offset); 1680 nextlbn = lbn + 1; 1681 size = blksize(fs, ip, lbn); 1682 blkoffset = blkoff(fs, uio->uio_offset); 1683 1684 xfersize = fs->e2fs_fsize - blkoffset; 1685 if (uio->uio_resid < xfersize) 1686 xfersize = uio->uio_resid; 1687 if (bytesinfile < xfersize) 1688 xfersize = bytesinfile; 1689 1690 if (lblktosize(fs, nextlbn) >= ip->i_size) 1691 error = bread(vp, lbn, size, NOCRED, &bp); 1692 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) 1693 error = cluster_read(vp, ip->i_size, lbn, size, 1694 NOCRED, blkoffset + uio->uio_resid, seqcount, &bp); 1695 else if (seqcount > 1) { 1696 u_int nextsize = blksize(fs, ip, nextlbn); 1697 error = breadn(vp, lbn, 1698 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1699 } else 1700 error = bread(vp, lbn, size, NOCRED, &bp); 1701 if (error) { 1702 brelse(bp); 1703 bp = NULL; 1704 break; 1705 } 1706 1707 /* 1708 * If IO_DIRECT then set B_DIRECT for the buffer. This 1709 * will cause us to attempt to release the buffer later on 1710 * and will cause the buffer cache to attempt to free the 1711 * underlying pages. 1712 */ 1713 if (ioflag & IO_DIRECT) 1714 bp->b_flags |= B_DIRECT; 1715 1716 /* 1717 * We should only get non-zero b_resid when an I/O error 1718 * has occurred, which should cause us to break above. 1719 * However, if the short read did not cause an error, 1720 * then we want to ensure that we do not uiomove bad 1721 * or uninitialized data. 1722 */ 1723 size -= bp->b_resid; 1724 if (size < xfersize) { 1725 if (size == 0) 1726 break; 1727 xfersize = size; 1728 } 1729 error = uiomove((char *)bp->b_data + blkoffset, 1730 (int)xfersize, uio); 1731 if (error) 1732 break; 1733 1734 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1735 /* 1736 * If it's VMIO or direct I/O, then we don't 1737 * need the buf, mark it available for 1738 * freeing. If it's non-direct VMIO, the VM has 1739 * the data. 1740 */ 1741 bp->b_flags |= B_RELBUF; 1742 brelse(bp); 1743 } else { 1744 /* 1745 * Otherwise let whoever 1746 * made the request take care of 1747 * freeing it. We just queue 1748 * it onto another list. 1749 */ 1750 bqrelse(bp); 1751 } 1752 } 1753 1754 /* 1755 * This can only happen in the case of an error 1756 * because the loop above resets bp to NULL on each iteration 1757 * and on normal completion has not set a new value into it. 1758 * so it must have come from a 'break' statement 1759 */ 1760 if (bp != NULL) { 1761 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1762 bp->b_flags |= B_RELBUF; 1763 brelse(bp); 1764 } else { 1765 bqrelse(bp); 1766 } 1767 } 1768 1769 if ((error == 0 || uio->uio_resid != orig_resid) && 1770 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1771 ip->i_flag |= IN_ACCESS; 1772 return (error); 1773} 1774 1775static int 1776ext2_ioctl(struct vop_ioctl_args *ap) 1777{ 1778 1779 switch (ap->a_command) { 1780 case FIOSEEKDATA: 1781 case FIOSEEKHOLE: 1782 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1783 (off_t *)ap->a_data, ap->a_cred)); 1784 default: 1785 return (ENOTTY); 1786 } 1787} 1788 1789/* 1790 * this function handles ext4 extents block mapping 1791 */ 1792static int 1793ext4_ext_read(struct vop_read_args *ap) 1794{ 1795 struct vnode *vp; 1796 struct inode *ip; 1797 struct uio *uio; 1798 struct m_ext2fs *fs; 1799 struct buf *bp; 1800 struct ext4_extent nex, *ep; 1801 struct ext4_extent_path path; 1802 daddr_t lbn, newblk; 1803 off_t bytesinfile; 1804 int cache_type; 1805 ssize_t orig_resid; 1806 int error; 1807 long size, xfersize, blkoffset; 1808 1809 vp = ap->a_vp; 1810 ip = VTOI(vp); 1811 uio = ap->a_uio; 1812 memset(&path, 0, sizeof(path)); 1813 1814 orig_resid = uio->uio_resid; 1815 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1816 if (orig_resid == 0) 1817 return (0); 1818 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1819 fs = ip->i_e2fs; 1820 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1821 return (EOVERFLOW); 1822 1823 while (uio->uio_resid > 0) { 1824 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1825 break; 1826 lbn = lblkno(fs, uio->uio_offset); 1827 size = blksize(fs, ip, lbn); 1828 blkoffset = blkoff(fs, uio->uio_offset); 1829 1830 xfersize = fs->e2fs_fsize - blkoffset; 1831 xfersize = MIN(xfersize, uio->uio_resid); 1832 xfersize = MIN(xfersize, bytesinfile); 1833 1834 /* get block from ext4 extent cache */ 1835 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1836 switch (cache_type) { 1837 case EXT4_EXT_CACHE_NO: 1838 ext4_ext_find_extent(fs, ip, lbn, &path); 1839 ep = path.ep_ext; 1840 if (ep == NULL) 1841 return (EIO); 1842 1843 ext4_ext_put_cache(ip, ep, 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 return (0); 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 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp); 1868 if (error) { 1869 brelse(bp); 1870 return (error); 1871 } 1872 1873 size -= bp->b_resid; 1874 if (size < xfersize) { 1875 if (size == 0) { 1876 bqrelse(bp); 1877 break; 1878 } 1879 xfersize = size; 1880 } 1881 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio); 1882 bqrelse(bp); 1883 if (error) 1884 return (error); 1885 } 1886 1887 return (0); 1888} 1889 1890/* 1891 * Vnode op for writing. 1892 */ 1893static int 1894ext2_write(struct vop_write_args *ap) 1895{ 1896 struct vnode *vp; 1897 struct uio *uio; 1898 struct inode *ip; 1899 struct m_ext2fs *fs; 1900 struct buf *bp; 1901 daddr_t lbn; 1902 off_t osize; 1903 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 1904 1905 ioflag = ap->a_ioflag; 1906 uio = ap->a_uio; 1907 vp = ap->a_vp; 1908 1909 seqcount = ioflag >> IO_SEQSHIFT; 1910 ip = VTOI(vp); 1911 1912#ifdef INVARIANTS 1913 if (uio->uio_rw != UIO_WRITE) 1914 panic("%s: mode", "ext2_write"); 1915#endif 1916 1917 switch (vp->v_type) { 1918 case VREG: 1919 if (ioflag & IO_APPEND) 1920 uio->uio_offset = ip->i_size; 1921 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 1922 return (EPERM); 1923 /* FALLTHROUGH */ 1924 case VLNK: 1925 break; 1926 case VDIR: 1927 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 1928 if ((ioflag & IO_SYNC) == 0) 1929 panic("ext2_write: nonsync dir write"); 1930 break; 1931 default: 1932 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 1933 vp->v_type, (intmax_t)uio->uio_offset, 1934 (intmax_t)uio->uio_resid); 1935 } 1936 1937 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 1938 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 1939 fs = ip->i_e2fs; 1940 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 1941 return (EFBIG); 1942 /* 1943 * Maybe this should be above the vnode op call, but so long as 1944 * file servers have no limits, I don't think it matters. 1945 */ 1946 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 1947 return (EFBIG); 1948 1949 resid = uio->uio_resid; 1950 osize = ip->i_size; 1951 if (seqcount > BA_SEQMAX) 1952 flags = BA_SEQMAX << BA_SEQSHIFT; 1953 else 1954 flags = seqcount << BA_SEQSHIFT; 1955 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1956 flags |= IO_SYNC; 1957 1958 for (error = 0; uio->uio_resid > 0;) { 1959 lbn = lblkno(fs, uio->uio_offset); 1960 blkoffset = blkoff(fs, uio->uio_offset); 1961 xfersize = fs->e2fs_fsize - blkoffset; 1962 if (uio->uio_resid < xfersize) 1963 xfersize = uio->uio_resid; 1964 if (uio->uio_offset + xfersize > ip->i_size) 1965 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 1966 1967 /* 1968 * We must perform a read-before-write if the transfer size 1969 * does not cover the entire buffer. 1970 */ 1971 if (fs->e2fs_bsize > xfersize) 1972 flags |= BA_CLRBUF; 1973 else 1974 flags &= ~BA_CLRBUF; 1975 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 1976 ap->a_cred, &bp, flags); 1977 if (error != 0) 1978 break; 1979 1980 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 1981 bp->b_flags |= B_NOCACHE; 1982 if (uio->uio_offset + xfersize > ip->i_size) 1983 ip->i_size = uio->uio_offset + xfersize; 1984 size = blksize(fs, ip, lbn) - bp->b_resid; 1985 if (size < xfersize) 1986 xfersize = size; 1987 1988 error = 1989 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1990 /* 1991 * If the buffer is not already filled and we encounter an 1992 * error while trying to fill it, we have to clear out any 1993 * garbage data from the pages instantiated for the buffer. 1994 * If we do not, a failed uiomove() during a write can leave 1995 * the prior contents of the pages exposed to a userland mmap. 1996 * 1997 * Note that we need only clear buffers with a transfer size 1998 * equal to the block size because buffers with a shorter 1999 * transfer size were cleared above by the call to ext2_balloc() 2000 * with the BA_CLRBUF flag set. 2001 * 2002 * If the source region for uiomove identically mmaps the 2003 * buffer, uiomove() performed the NOP copy, and the buffer 2004 * content remains valid because the page fault handler 2005 * validated the pages. 2006 */ 2007 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2008 fs->e2fs_bsize == xfersize) 2009 vfs_bio_clrbuf(bp); 2010 if (ioflag & (IO_VMIO|IO_DIRECT)) { 2011 bp->b_flags |= B_RELBUF; 2012 } 2013 2014 /* 2015 * If IO_SYNC each buffer is written synchronously. Otherwise 2016 * if we have a severe page deficiency write the buffer 2017 * asynchronously. Otherwise try to cluster, and if that 2018 * doesn't do it then either do an async write (if O_DIRECT), 2019 * or a delayed write (if not). 2020 */ 2021 if (ioflag & IO_SYNC) { 2022 (void)bwrite(bp); 2023 } else if (vm_page_count_severe() || 2024 buf_dirty_count_severe() || 2025 (ioflag & IO_ASYNC)) { 2026 bp->b_flags |= B_CLUSTEROK; 2027 bawrite(bp); 2028 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2029 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2030 bp->b_flags |= B_CLUSTEROK; 2031 cluster_write(vp, bp, ip->i_size, seqcount); 2032 } else { 2033 bawrite(bp); 2034 } 2035 } else if (ioflag & IO_DIRECT) { 2036 bp->b_flags |= B_CLUSTEROK; 2037 bawrite(bp); 2038 } else { 2039 bp->b_flags |= B_CLUSTEROK; 2040 bdwrite(bp); 2041 } 2042 if (error || xfersize == 0) 2043 break; 2044 } 2045 /* 2046 * If we successfully wrote any data, and we are not the superuser 2047 * we clear the setuid and setgid bits as a precaution against 2048 * tampering. 2049 */ 2050 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2051 ap->a_cred) { 2052 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2053 ip->i_mode &= ~(ISUID | ISGID); 2054 } 2055 if (error) { 2056 if (ioflag & IO_UNIT) { 2057 (void)ext2_truncate(vp, osize, 2058 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2059 uio->uio_offset -= resid - uio->uio_resid; 2060 uio->uio_resid = resid; 2061 } 2062 } 2063 if (uio->uio_resid != resid) { 2064 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2065 if (ioflag & IO_SYNC) 2066 error = ext2_update(vp, 1); 2067 } 2068 return (error); 2069} 2070