ext2_vnops.c revision 262723
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: stable/10/sys/fs/ext2fs/ext2_vnops.c 262723 2014-03-04 03:10:31Z pfg $ 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 85static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 86static void ext2_itimes_locked(struct vnode *); 87static int ext4_ext_read(struct vop_read_args *); 88static int ext2_ind_read(struct vop_read_args *); 89 90static vop_access_t ext2_access; 91static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 92static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 93 struct thread *); 94static vop_close_t ext2_close; 95static vop_create_t ext2_create; 96static vop_fsync_t ext2_fsync; 97static vop_getattr_t ext2_getattr; 98static vop_ioctl_t ext2_ioctl; 99static vop_link_t ext2_link; 100static vop_mkdir_t ext2_mkdir; 101static vop_mknod_t ext2_mknod; 102static vop_open_t ext2_open; 103static vop_pathconf_t ext2_pathconf; 104static vop_print_t ext2_print; 105static vop_read_t ext2_read; 106static vop_readlink_t ext2_readlink; 107static vop_remove_t ext2_remove; 108static vop_rename_t ext2_rename; 109static vop_rmdir_t ext2_rmdir; 110static vop_setattr_t ext2_setattr; 111static vop_strategy_t ext2_strategy; 112static vop_symlink_t ext2_symlink; 113static vop_write_t ext2_write; 114static vop_vptofh_t ext2_vptofh; 115static vop_close_t ext2fifo_close; 116static vop_kqfilter_t ext2fifo_kqfilter; 117 118/* Global vfs data structures for ext2. */ 119struct 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 153struct 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 */ 175static struct dirtemplate mastertemplate = { 176 0, 12, 1, EXT2_FT_DIR, ".", 177 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 178}; 179static struct dirtemplate omastertemplate = { 180 0, 12, 1, EXT2_FT_UNKNOWN, ".", 181 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 182}; 183 184static void 185ext2_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 218void 219ext2_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 */ 230static int 231ext2_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 243static int 244ext2_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 */ 267static int 268ext2_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 279static int 280ext2_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 317static int 318ext2_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 vap->va_gen = ip->i_gen; 348 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 349 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 350 vap->va_type = IFTOVT(ip->i_mode); 351 vap->va_filerev = ip->i_modrev; 352 return (0); 353} 354 355/* 356 * Set attribute vnode op. called from several syscalls 357 */ 358static int 359ext2_setattr(struct vop_setattr_args *ap) 360{ 361 struct vattr *vap = ap->a_vap; 362 struct vnode *vp = ap->a_vp; 363 struct inode *ip = VTOI(vp); 364 struct ucred *cred = ap->a_cred; 365 struct thread *td = curthread; 366 int error; 367 368 /* 369 * Check for unsettable attributes. 370 */ 371 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 372 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 373 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 374 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 375 return (EINVAL); 376 } 377 if (vap->va_flags != VNOVAL) { 378 /* Disallow flags not supported by ext2fs. */ 379 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 380 return (EOPNOTSUPP); 381 382 if (vp->v_mount->mnt_flag & MNT_RDONLY) 383 return (EROFS); 384 /* 385 * Callers may only modify the file flags on objects they 386 * have VADMIN rights for. 387 */ 388 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 389 return (error); 390 /* 391 * Unprivileged processes and privileged processes in 392 * jail() are not permitted to unset system flags, or 393 * modify flags if any system flags are set. 394 * Privileged non-jail processes may not modify system flags 395 * if securelevel > 0 and any existing system flags are set. 396 */ 397 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 398 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 399 error = securelevel_gt(cred, 0); 400 if (error) 401 return (error); 402 } 403 } else { 404 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 405 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 406 return (EPERM); 407 } 408 ip->i_flags = vap->va_flags; 409 ip->i_flag |= IN_CHANGE; 410 if (ip->i_flags & (IMMUTABLE | APPEND)) 411 return (0); 412 } 413 if (ip->i_flags & (IMMUTABLE | APPEND)) 414 return (EPERM); 415 /* 416 * Go through the fields and update iff not VNOVAL. 417 */ 418 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 419 if (vp->v_mount->mnt_flag & MNT_RDONLY) 420 return (EROFS); 421 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 422 td)) != 0) 423 return (error); 424 } 425 if (vap->va_size != VNOVAL) { 426 /* 427 * Disallow write attempts on read-only file systems; 428 * unless the file is a socket, fifo, or a block or 429 * character device resident on the file system. 430 */ 431 switch (vp->v_type) { 432 case VDIR: 433 return (EISDIR); 434 case VLNK: 435 case VREG: 436 if (vp->v_mount->mnt_flag & MNT_RDONLY) 437 return (EROFS); 438 break; 439 default: 440 break; 441 } 442 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 443 return (error); 444 } 445 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 446 if (vp->v_mount->mnt_flag & MNT_RDONLY) 447 return (EROFS); 448 /* 449 * From utimes(2): 450 * If times is NULL, ... The caller must be the owner of 451 * the file, have permission to write the file, or be the 452 * super-user. 453 * If times is non-NULL, ... The caller must be the owner of 454 * the file or be the super-user. 455 */ 456 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 457 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 458 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 459 return (error); 460 if (vap->va_atime.tv_sec != VNOVAL) 461 ip->i_flag |= IN_ACCESS; 462 if (vap->va_mtime.tv_sec != VNOVAL) 463 ip->i_flag |= IN_CHANGE | IN_UPDATE; 464 ext2_itimes(vp); 465 if (vap->va_atime.tv_sec != VNOVAL) { 466 ip->i_atime = vap->va_atime.tv_sec; 467 ip->i_atimensec = vap->va_atime.tv_nsec; 468 } 469 if (vap->va_mtime.tv_sec != VNOVAL) { 470 ip->i_mtime = vap->va_mtime.tv_sec; 471 ip->i_mtimensec = vap->va_mtime.tv_nsec; 472 } 473 ip->i_birthtime = vap->va_birthtime.tv_sec; 474 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 475 error = ext2_update(vp, 0); 476 if (error) 477 return (error); 478 } 479 error = 0; 480 if (vap->va_mode != (mode_t)VNOVAL) { 481 if (vp->v_mount->mnt_flag & MNT_RDONLY) 482 return (EROFS); 483 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 484 } 485 return (error); 486} 487 488/* 489 * Change the mode on a file. 490 * Inode must be locked before calling. 491 */ 492static int 493ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 494{ 495 struct inode *ip = VTOI(vp); 496 int error; 497 498 /* 499 * To modify the permissions on a file, must possess VADMIN 500 * for that file. 501 */ 502 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 503 return (error); 504 /* 505 * Privileged processes may set the sticky bit on non-directories, 506 * as well as set the setgid bit on a file with a group that the 507 * process is not a member of. 508 */ 509 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 510 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 511 if (error) 512 return (EFTYPE); 513 } 514 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 515 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 516 if (error) 517 return (error); 518 } 519 ip->i_mode &= ~ALLPERMS; 520 ip->i_mode |= (mode & ALLPERMS); 521 ip->i_flag |= IN_CHANGE; 522 return (0); 523} 524 525/* 526 * Perform chown operation on inode ip; 527 * inode must be locked prior to call. 528 */ 529static int 530ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 531 struct thread *td) 532{ 533 struct inode *ip = VTOI(vp); 534 uid_t ouid; 535 gid_t ogid; 536 int error = 0; 537 538 if (uid == (uid_t)VNOVAL) 539 uid = ip->i_uid; 540 if (gid == (gid_t)VNOVAL) 541 gid = ip->i_gid; 542 /* 543 * To modify the ownership of a file, must possess VADMIN 544 * for that file. 545 */ 546 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 547 return (error); 548 /* 549 * To change the owner of a file, or change the group of a file 550 * to a group of which we are not a member, the caller must 551 * have privilege. 552 */ 553 if (uid != ip->i_uid || (gid != ip->i_gid && 554 !groupmember(gid, cred))) { 555 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 556 if (error) 557 return (error); 558 } 559 ogid = ip->i_gid; 560 ouid = ip->i_uid; 561 ip->i_gid = gid; 562 ip->i_uid = uid; 563 ip->i_flag |= IN_CHANGE; 564 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 565 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 566 ip->i_mode &= ~(ISUID | ISGID); 567 } 568 return (0); 569} 570 571/* 572 * Synch an open file. 573 */ 574/* ARGSUSED */ 575static int 576ext2_fsync(struct vop_fsync_args *ap) 577{ 578 /* 579 * Flush all dirty buffers associated with a vnode. 580 */ 581 582 vop_stdfsync(ap); 583 584 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 585} 586 587/* 588 * Mknod vnode call 589 */ 590/* ARGSUSED */ 591static int 592ext2_mknod(struct vop_mknod_args *ap) 593{ 594 struct vattr *vap = ap->a_vap; 595 struct vnode **vpp = ap->a_vpp; 596 struct inode *ip; 597 ino_t ino; 598 int error; 599 600 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 601 ap->a_dvp, vpp, ap->a_cnp); 602 if (error) 603 return (error); 604 ip = VTOI(*vpp); 605 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 606 if (vap->va_rdev != VNOVAL) { 607 /* 608 * Want to be able to use this to make badblock 609 * inodes, so don't truncate the dev number. 610 */ 611 ip->i_rdev = vap->va_rdev; 612 } 613 /* 614 * Remove inode, then reload it through VFS_VGET so it is 615 * checked to see if it is an alias of an existing entry in 616 * the inode cache. XXX I don't believe this is necessary now. 617 */ 618 (*vpp)->v_type = VNON; 619 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 620 vgone(*vpp); 621 vput(*vpp); 622 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 623 if (error) { 624 *vpp = NULL; 625 return (error); 626 } 627 return (0); 628} 629 630static int 631ext2_remove(struct vop_remove_args *ap) 632{ 633 struct inode *ip; 634 struct vnode *vp = ap->a_vp; 635 struct vnode *dvp = ap->a_dvp; 636 int error; 637 638 ip = VTOI(vp); 639 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 640 (VTOI(dvp)->i_flags & APPEND)) { 641 error = EPERM; 642 goto out; 643 } 644 error = ext2_dirremove(dvp, ap->a_cnp); 645 if (error == 0) { 646 ip->i_nlink--; 647 ip->i_flag |= IN_CHANGE; 648 } 649out: 650 return (error); 651} 652 653/* 654 * link vnode call 655 */ 656static int 657ext2_link(struct vop_link_args *ap) 658{ 659 struct vnode *vp = ap->a_vp; 660 struct vnode *tdvp = ap->a_tdvp; 661 struct componentname *cnp = ap->a_cnp; 662 struct inode *ip; 663 int error; 664 665#ifdef INVARIANTS 666 if ((cnp->cn_flags & HASBUF) == 0) 667 panic("ext2_link: no name"); 668#endif 669 if (tdvp->v_mount != vp->v_mount) { 670 error = EXDEV; 671 goto out; 672 } 673 ip = VTOI(vp); 674 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 675 error = EMLINK; 676 goto out; 677 } 678 if (ip->i_flags & (IMMUTABLE | APPEND)) { 679 error = EPERM; 680 goto out; 681 } 682 ip->i_nlink++; 683 ip->i_flag |= IN_CHANGE; 684 error = ext2_update(vp, !DOINGASYNC(vp)); 685 if (!error) 686 error = ext2_direnter(ip, tdvp, cnp); 687 if (error) { 688 ip->i_nlink--; 689 ip->i_flag |= IN_CHANGE; 690 } 691out: 692 return (error); 693} 694 695/* 696 * Rename system call. 697 * rename("foo", "bar"); 698 * is essentially 699 * unlink("bar"); 700 * link("foo", "bar"); 701 * unlink("foo"); 702 * but ``atomically''. Can't do full commit without saving state in the 703 * inode on disk which isn't feasible at this time. Best we can do is 704 * always guarantee the target exists. 705 * 706 * Basic algorithm is: 707 * 708 * 1) Bump link count on source while we're linking it to the 709 * target. This also ensure the inode won't be deleted out 710 * from underneath us while we work (it may be truncated by 711 * a concurrent `trunc' or `open' for creation). 712 * 2) Link source to destination. If destination already exists, 713 * delete it first. 714 * 3) Unlink source reference to inode if still around. If a 715 * directory was moved and the parent of the destination 716 * is different from the source, patch the ".." entry in the 717 * directory. 718 */ 719static int 720ext2_rename(struct vop_rename_args *ap) 721{ 722 struct vnode *tvp = ap->a_tvp; 723 struct vnode *tdvp = ap->a_tdvp; 724 struct vnode *fvp = ap->a_fvp; 725 struct vnode *fdvp = ap->a_fdvp; 726 struct componentname *tcnp = ap->a_tcnp; 727 struct componentname *fcnp = ap->a_fcnp; 728 struct inode *ip, *xp, *dp; 729 struct dirtemplate dirbuf; 730 int doingdirectory = 0, oldparent = 0, newparent = 0; 731 int error = 0; 732 u_char namlen; 733 734#ifdef INVARIANTS 735 if ((tcnp->cn_flags & HASBUF) == 0 || 736 (fcnp->cn_flags & HASBUF) == 0) 737 panic("ext2_rename: no name"); 738#endif 739 /* 740 * Check for cross-device rename. 741 */ 742 if ((fvp->v_mount != tdvp->v_mount) || 743 (tvp && (fvp->v_mount != tvp->v_mount))) { 744 error = EXDEV; 745abortit: 746 if (tdvp == tvp) 747 vrele(tdvp); 748 else 749 vput(tdvp); 750 if (tvp) 751 vput(tvp); 752 vrele(fdvp); 753 vrele(fvp); 754 return (error); 755 } 756 757 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 758 (VTOI(tdvp)->i_flags & APPEND))) { 759 error = EPERM; 760 goto abortit; 761 } 762 763 /* 764 * Renaming a file to itself has no effect. The upper layers should 765 * not call us in that case. Temporarily just warn if they do. 766 */ 767 if (fvp == tvp) { 768 printf("ext2_rename: fvp == tvp (can't happen)\n"); 769 error = 0; 770 goto abortit; 771 } 772 773 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 774 goto abortit; 775 dp = VTOI(fdvp); 776 ip = VTOI(fvp); 777 if (ip->i_nlink >= EXT2_LINK_MAX) { 778 VOP_UNLOCK(fvp, 0); 779 error = EMLINK; 780 goto abortit; 781 } 782 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 783 || (dp->i_flags & APPEND)) { 784 VOP_UNLOCK(fvp, 0); 785 error = EPERM; 786 goto abortit; 787 } 788 if ((ip->i_mode & IFMT) == IFDIR) { 789 /* 790 * Avoid ".", "..", and aliases of "." for obvious reasons. 791 */ 792 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 793 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 794 (ip->i_flag & IN_RENAME)) { 795 VOP_UNLOCK(fvp, 0); 796 error = EINVAL; 797 goto abortit; 798 } 799 ip->i_flag |= IN_RENAME; 800 oldparent = dp->i_number; 801 doingdirectory++; 802 } 803 vrele(fdvp); 804 805 /* 806 * When the target exists, both the directory 807 * and target vnodes are returned locked. 808 */ 809 dp = VTOI(tdvp); 810 xp = NULL; 811 if (tvp) 812 xp = VTOI(tvp); 813 814 /* 815 * 1) Bump link count while we're moving stuff 816 * around. If we crash somewhere before 817 * completing our work, the link count 818 * may be wrong, but correctable. 819 */ 820 ip->i_nlink++; 821 ip->i_flag |= IN_CHANGE; 822 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 823 VOP_UNLOCK(fvp, 0); 824 goto bad; 825 } 826 827 /* 828 * If ".." must be changed (ie the directory gets a new 829 * parent) then the source directory must not be in the 830 * directory hierarchy above the target, as this would 831 * orphan everything below the source directory. Also 832 * the user must have write permission in the source so 833 * as to be able to change "..". We must repeat the call 834 * to namei, as the parent directory is unlocked by the 835 * call to checkpath(). 836 */ 837 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 838 VOP_UNLOCK(fvp, 0); 839 if (oldparent != dp->i_number) 840 newparent = dp->i_number; 841 if (doingdirectory && newparent) { 842 if (error) /* write access check above */ 843 goto bad; 844 if (xp != NULL) 845 vput(tvp); 846 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 847 if (error) 848 goto out; 849 VREF(tdvp); 850 error = relookup(tdvp, &tvp, tcnp); 851 if (error) 852 goto out; 853 vrele(tdvp); 854 dp = VTOI(tdvp); 855 xp = NULL; 856 if (tvp) 857 xp = VTOI(tvp); 858 } 859 /* 860 * 2) If target doesn't exist, link the target 861 * to the source and unlink the source. 862 * Otherwise, rewrite the target directory 863 * entry to reference the source inode and 864 * expunge the original entry's existence. 865 */ 866 if (xp == NULL) { 867 if (dp->i_devvp != ip->i_devvp) 868 panic("ext2_rename: EXDEV"); 869 /* 870 * Account for ".." in new directory. 871 * When source and destination have the same 872 * parent we don't fool with the link count. 873 */ 874 if (doingdirectory && newparent) { 875 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 876 error = EMLINK; 877 goto bad; 878 } 879 dp->i_nlink++; 880 dp->i_flag |= IN_CHANGE; 881 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 882 if (error) 883 goto bad; 884 } 885 error = ext2_direnter(ip, tdvp, tcnp); 886 if (error) { 887 if (doingdirectory && newparent) { 888 dp->i_nlink--; 889 dp->i_flag |= IN_CHANGE; 890 (void)ext2_update(tdvp, 1); 891 } 892 goto bad; 893 } 894 vput(tdvp); 895 } else { 896 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 897 panic("ext2_rename: EXDEV"); 898 /* 899 * Short circuit rename(foo, foo). 900 */ 901 if (xp->i_number == ip->i_number) 902 panic("ext2_rename: same file"); 903 /* 904 * If the parent directory is "sticky", then the user must 905 * own the parent directory, or the destination of the rename, 906 * otherwise the destination may not be changed (except by 907 * root). This implements append-only directories. 908 */ 909 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 910 tcnp->cn_cred->cr_uid != dp->i_uid && 911 xp->i_uid != tcnp->cn_cred->cr_uid) { 912 error = EPERM; 913 goto bad; 914 } 915 /* 916 * Target must be empty if a directory and have no links 917 * to it. Also, ensure source and target are compatible 918 * (both directories, or both not directories). 919 */ 920 if ((xp->i_mode&IFMT) == IFDIR) { 921 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 922 xp->i_nlink > 2) { 923 error = ENOTEMPTY; 924 goto bad; 925 } 926 if (!doingdirectory) { 927 error = ENOTDIR; 928 goto bad; 929 } 930 cache_purge(tdvp); 931 } else if (doingdirectory) { 932 error = EISDIR; 933 goto bad; 934 } 935 error = ext2_dirrewrite(dp, ip, tcnp); 936 if (error) 937 goto bad; 938 /* 939 * If the target directory is in the same 940 * directory as the source directory, 941 * decrement the link count on the parent 942 * of the target directory. 943 */ 944 if (doingdirectory && !newparent) { 945 dp->i_nlink--; 946 dp->i_flag |= IN_CHANGE; 947 } 948 vput(tdvp); 949 /* 950 * Adjust the link count of the target to 951 * reflect the dirrewrite above. If this is 952 * a directory it is empty and there are 953 * no links to it, so we can squash the inode and 954 * any space associated with it. We disallowed 955 * renaming over top of a directory with links to 956 * it above, as the remaining link would point to 957 * a directory without "." or ".." entries. 958 */ 959 xp->i_nlink--; 960 if (doingdirectory) { 961 if (--xp->i_nlink != 0) 962 panic("ext2_rename: linked directory"); 963 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 964 tcnp->cn_cred, tcnp->cn_thread); 965 } 966 xp->i_flag |= IN_CHANGE; 967 vput(tvp); 968 xp = NULL; 969 } 970 971 /* 972 * 3) Unlink the source. 973 */ 974 fcnp->cn_flags &= ~MODMASK; 975 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 976 VREF(fdvp); 977 error = relookup(fdvp, &fvp, fcnp); 978 if (error == 0) 979 vrele(fdvp); 980 if (fvp != NULL) { 981 xp = VTOI(fvp); 982 dp = VTOI(fdvp); 983 } else { 984 /* 985 * From name has disappeared. 986 */ 987 if (doingdirectory) 988 panic("ext2_rename: lost dir entry"); 989 vrele(ap->a_fvp); 990 return (0); 991 } 992 /* 993 * Ensure that the directory entry still exists and has not 994 * changed while the new name has been entered. If the source is 995 * a file then the entry may have been unlinked or renamed. In 996 * either case there is no further work to be done. If the source 997 * is a directory then it cannot have been rmdir'ed; its link 998 * count of three would cause a rmdir to fail with ENOTEMPTY. 999 * The IN_RENAME flag ensures that it cannot be moved by another 1000 * rename. 1001 */ 1002 if (xp != ip) { 1003 if (doingdirectory) 1004 panic("ext2_rename: lost dir entry"); 1005 } else { 1006 /* 1007 * If the source is a directory with a 1008 * new parent, the link count of the old 1009 * parent directory must be decremented 1010 * and ".." set to point to the new parent. 1011 */ 1012 if (doingdirectory && newparent) { 1013 dp->i_nlink--; 1014 dp->i_flag |= IN_CHANGE; 1015 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1016 sizeof(struct dirtemplate), (off_t)0, 1017 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1018 tcnp->cn_cred, NOCRED, NULL, NULL); 1019 if (error == 0) { 1020 /* Like ufs little-endian: */ 1021 namlen = dirbuf.dotdot_type; 1022 if (namlen != 2 || 1023 dirbuf.dotdot_name[0] != '.' || 1024 dirbuf.dotdot_name[1] != '.') { 1025 ext2_dirbad(xp, (doff_t)12, 1026 "rename: mangled dir"); 1027 } else { 1028 dirbuf.dotdot_ino = newparent; 1029 (void) vn_rdwr(UIO_WRITE, fvp, 1030 (caddr_t)&dirbuf, 1031 sizeof(struct dirtemplate), 1032 (off_t)0, UIO_SYSSPACE, 1033 IO_NODELOCKED | IO_SYNC | 1034 IO_NOMACCHECK, tcnp->cn_cred, 1035 NOCRED, NULL, NULL); 1036 cache_purge(fdvp); 1037 } 1038 } 1039 } 1040 error = ext2_dirremove(fdvp, fcnp); 1041 if (!error) { 1042 xp->i_nlink--; 1043 xp->i_flag |= IN_CHANGE; 1044 } 1045 xp->i_flag &= ~IN_RENAME; 1046 } 1047 if (dp) 1048 vput(fdvp); 1049 if (xp) 1050 vput(fvp); 1051 vrele(ap->a_fvp); 1052 return (error); 1053 1054bad: 1055 if (xp) 1056 vput(ITOV(xp)); 1057 vput(ITOV(dp)); 1058out: 1059 if (doingdirectory) 1060 ip->i_flag &= ~IN_RENAME; 1061 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1062 ip->i_nlink--; 1063 ip->i_flag |= IN_CHANGE; 1064 ip->i_flag &= ~IN_RENAME; 1065 vput(fvp); 1066 } else 1067 vrele(fvp); 1068 return (error); 1069} 1070 1071/* 1072 * Mkdir system call 1073 */ 1074static int 1075ext2_mkdir(struct vop_mkdir_args *ap) 1076{ 1077 struct vnode *dvp = ap->a_dvp; 1078 struct vattr *vap = ap->a_vap; 1079 struct componentname *cnp = ap->a_cnp; 1080 struct inode *ip, *dp; 1081 struct vnode *tvp; 1082 struct dirtemplate dirtemplate, *dtp; 1083 int error, dmode; 1084 1085#ifdef INVARIANTS 1086 if ((cnp->cn_flags & HASBUF) == 0) 1087 panic("ext2_mkdir: no name"); 1088#endif 1089 dp = VTOI(dvp); 1090 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1091 error = EMLINK; 1092 goto out; 1093 } 1094 dmode = vap->va_mode & 0777; 1095 dmode |= IFDIR; 1096 /* 1097 * Must simulate part of ext2_makeinode here to acquire the inode, 1098 * but not have it entered in the parent directory. The entry is 1099 * made later after writing "." and ".." entries. 1100 */ 1101 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1102 if (error) 1103 goto out; 1104 ip = VTOI(tvp); 1105 ip->i_gid = dp->i_gid; 1106#ifdef SUIDDIR 1107 { 1108 /* 1109 * if we are hacking owners here, (only do this where told to) 1110 * and we are not giving it TOO root, (would subvert quotas) 1111 * then go ahead and give it to the other user. 1112 * The new directory also inherits the SUID bit. 1113 * If user's UID and dir UID are the same, 1114 * 'give it away' so that the SUID is still forced on. 1115 */ 1116 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1117 (dp->i_mode & ISUID) && dp->i_uid) { 1118 dmode |= ISUID; 1119 ip->i_uid = dp->i_uid; 1120 } else { 1121 ip->i_uid = cnp->cn_cred->cr_uid; 1122 } 1123 } 1124#else 1125 ip->i_uid = cnp->cn_cred->cr_uid; 1126#endif 1127 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1128 ip->i_mode = dmode; 1129 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1130 ip->i_nlink = 2; 1131 if (cnp->cn_flags & ISWHITEOUT) 1132 ip->i_flags |= UF_OPAQUE; 1133 error = ext2_update(tvp, 1); 1134 1135 /* 1136 * Bump link count in parent directory 1137 * to reflect work done below. Should 1138 * be done before reference is created 1139 * so reparation is possible if we crash. 1140 */ 1141 dp->i_nlink++; 1142 dp->i_flag |= IN_CHANGE; 1143 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1144 if (error) 1145 goto bad; 1146 1147 /* Initialize directory with "." and ".." from static template. */ 1148 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1149 EXT2F_INCOMPAT_FTYPE)) 1150 dtp = &mastertemplate; 1151 else 1152 dtp = &omastertemplate; 1153 dirtemplate = *dtp; 1154 dirtemplate.dot_ino = ip->i_number; 1155 dirtemplate.dotdot_ino = dp->i_number; 1156 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1157 * so let's just redefine it - for this function only 1158 */ 1159#undef DIRBLKSIZ 1160#define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1161 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1162 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1163 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1164 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1165 NULL, NULL); 1166 if (error) { 1167 dp->i_nlink--; 1168 dp->i_flag |= IN_CHANGE; 1169 goto bad; 1170 } 1171 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1172 /* XXX should grow with balloc() */ 1173 panic("ext2_mkdir: blksize"); 1174 else { 1175 ip->i_size = DIRBLKSIZ; 1176 ip->i_flag |= IN_CHANGE; 1177 } 1178 1179 /* Directory set up, now install its entry in the parent directory. */ 1180 error = ext2_direnter(ip, dvp, cnp); 1181 if (error) { 1182 dp->i_nlink--; 1183 dp->i_flag |= IN_CHANGE; 1184 } 1185bad: 1186 /* 1187 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1188 * for us because we set the link count to 0. 1189 */ 1190 if (error) { 1191 ip->i_nlink = 0; 1192 ip->i_flag |= IN_CHANGE; 1193 vput(tvp); 1194 } else 1195 *ap->a_vpp = tvp; 1196out: 1197 return (error); 1198#undef DIRBLKSIZ 1199#define DIRBLKSIZ DEV_BSIZE 1200} 1201 1202/* 1203 * Rmdir system call. 1204 */ 1205static int 1206ext2_rmdir(struct vop_rmdir_args *ap) 1207{ 1208 struct vnode *vp = ap->a_vp; 1209 struct vnode *dvp = ap->a_dvp; 1210 struct componentname *cnp = ap->a_cnp; 1211 struct inode *ip, *dp; 1212 int error; 1213 1214 ip = VTOI(vp); 1215 dp = VTOI(dvp); 1216 1217 /* 1218 * Verify the directory is empty (and valid). 1219 * (Rmdir ".." won't be valid since 1220 * ".." will contain a reference to 1221 * the current directory and thus be 1222 * non-empty.) 1223 */ 1224 error = 0; 1225 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1226 error = ENOTEMPTY; 1227 goto out; 1228 } 1229 if ((dp->i_flags & APPEND) 1230 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1231 error = EPERM; 1232 goto out; 1233 } 1234 /* 1235 * Delete reference to directory before purging 1236 * inode. If we crash in between, the directory 1237 * will be reattached to lost+found, 1238 */ 1239 error = ext2_dirremove(dvp, cnp); 1240 if (error) 1241 goto out; 1242 dp->i_nlink--; 1243 dp->i_flag |= IN_CHANGE; 1244 cache_purge(dvp); 1245 VOP_UNLOCK(dvp, 0); 1246 /* 1247 * Truncate inode. The only stuff left 1248 * in the directory is "." and "..". The 1249 * "." reference is inconsequential since 1250 * we're quashing it. The ".." reference 1251 * has already been adjusted above. We've 1252 * removed the "." reference and the reference 1253 * in the parent directory, but there may be 1254 * other hard links so decrement by 2 and 1255 * worry about them later. 1256 */ 1257 ip->i_nlink -= 2; 1258 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1259 cnp->cn_thread); 1260 cache_purge(ITOV(ip)); 1261 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1262 VOP_UNLOCK(vp, 0); 1263 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1264 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1265 } 1266out: 1267 return (error); 1268} 1269 1270/* 1271 * symlink -- make a symbolic link 1272 */ 1273static int 1274ext2_symlink(struct vop_symlink_args *ap) 1275{ 1276 struct vnode *vp, **vpp = ap->a_vpp; 1277 struct inode *ip; 1278 int len, error; 1279 1280 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1281 vpp, ap->a_cnp); 1282 if (error) 1283 return (error); 1284 vp = *vpp; 1285 len = strlen(ap->a_target); 1286 if (len < vp->v_mount->mnt_maxsymlinklen) { 1287 ip = VTOI(vp); 1288 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1289 ip->i_size = len; 1290 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1291 } else 1292 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1293 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1294 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1295 if (error) 1296 vput(vp); 1297 return (error); 1298} 1299 1300/* 1301 * Return target name of a symbolic link 1302 */ 1303static int 1304ext2_readlink(struct vop_readlink_args *ap) 1305{ 1306 struct vnode *vp = ap->a_vp; 1307 struct inode *ip = VTOI(vp); 1308 int isize; 1309 1310 isize = ip->i_size; 1311 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1312 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1313 return (0); 1314 } 1315 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1316} 1317 1318/* 1319 * Calculate the logical to physical mapping if not done already, 1320 * then call the device strategy routine. 1321 * 1322 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1323 * deadlock on memory. See ext2_bmap() for details. 1324 */ 1325static int 1326ext2_strategy(struct vop_strategy_args *ap) 1327{ 1328 struct buf *bp = ap->a_bp; 1329 struct vnode *vp = ap->a_vp; 1330 struct inode *ip; 1331 struct bufobj *bo; 1332 daddr_t blkno; 1333 int error; 1334 1335 ip = VTOI(vp); 1336 if (vp->v_type == VBLK || vp->v_type == VCHR) 1337 panic("ext2_strategy: spec"); 1338 if (bp->b_blkno == bp->b_lblkno) { 1339 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1340 bp->b_blkno = blkno; 1341 if (error) { 1342 bp->b_error = error; 1343 bp->b_ioflags |= BIO_ERROR; 1344 bufdone(bp); 1345 return (0); 1346 } 1347 if ((long)bp->b_blkno == -1) 1348 vfs_bio_clrbuf(bp); 1349 } 1350 if ((long)bp->b_blkno == -1) { 1351 bufdone(bp); 1352 return (0); 1353 } 1354 bp->b_iooffset = dbtob(bp->b_blkno); 1355 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1356 BO_STRATEGY(bo, bp); 1357 return (0); 1358} 1359 1360/* 1361 * Print out the contents of an inode. 1362 */ 1363static int 1364ext2_print(struct vop_print_args *ap) 1365{ 1366 struct vnode *vp = ap->a_vp; 1367 struct inode *ip = VTOI(vp); 1368 1369 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number); 1370 if (vp->v_type == VFIFO) 1371 fifo_printinfo(vp); 1372 printf("\n"); 1373 return (0); 1374} 1375 1376/* 1377 * Close wrapper for fifos. 1378 * 1379 * Update the times on the inode then do device close. 1380 */ 1381static int 1382ext2fifo_close(struct vop_close_args *ap) 1383{ 1384 struct vnode *vp = ap->a_vp; 1385 1386 VI_LOCK(vp); 1387 if (vp->v_usecount > 1) 1388 ext2_itimes_locked(vp); 1389 VI_UNLOCK(vp); 1390 return (fifo_specops.vop_close(ap)); 1391} 1392 1393/* 1394 * Kqfilter wrapper for fifos. 1395 * 1396 * Fall through to ext2 kqfilter routines if needed 1397 */ 1398static int 1399ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1400{ 1401 int error; 1402 1403 error = fifo_specops.vop_kqfilter(ap); 1404 if (error) 1405 error = vfs_kqfilter(ap); 1406 return (error); 1407} 1408 1409/* 1410 * Return POSIX pathconf information applicable to ext2 filesystems. 1411 */ 1412static int 1413ext2_pathconf(struct vop_pathconf_args *ap) 1414{ 1415 int error = 0; 1416 1417 switch (ap->a_name) { 1418 case _PC_LINK_MAX: 1419 *ap->a_retval = EXT2_LINK_MAX; 1420 break; 1421 case _PC_NAME_MAX: 1422 *ap->a_retval = NAME_MAX; 1423 break; 1424 case _PC_PATH_MAX: 1425 *ap->a_retval = PATH_MAX; 1426 break; 1427 case _PC_PIPE_BUF: 1428 *ap->a_retval = PIPE_BUF; 1429 break; 1430 case _PC_CHOWN_RESTRICTED: 1431 *ap->a_retval = 1; 1432 break; 1433 case _PC_NO_TRUNC: 1434 *ap->a_retval = 1; 1435 break; 1436 case _PC_MIN_HOLE_SIZE: 1437 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1438 break; 1439 case _PC_ASYNC_IO: 1440 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1441 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1442 error = EINVAL; 1443 break; 1444 case _PC_PRIO_IO: 1445 *ap->a_retval = 0; 1446 break; 1447 case _PC_SYNC_IO: 1448 *ap->a_retval = 0; 1449 break; 1450 case _PC_ALLOC_SIZE_MIN: 1451 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1452 break; 1453 case _PC_FILESIZEBITS: 1454 *ap->a_retval = 64; 1455 break; 1456 case _PC_REC_INCR_XFER_SIZE: 1457 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1458 break; 1459 case _PC_REC_MAX_XFER_SIZE: 1460 *ap->a_retval = -1; /* means ``unlimited'' */ 1461 break; 1462 case _PC_REC_MIN_XFER_SIZE: 1463 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1464 break; 1465 case _PC_REC_XFER_ALIGN: 1466 *ap->a_retval = PAGE_SIZE; 1467 break; 1468 case _PC_SYMLINK_MAX: 1469 *ap->a_retval = MAXPATHLEN; 1470 break; 1471 1472 default: 1473 error = EINVAL; 1474 break; 1475 } 1476 return (error); 1477} 1478 1479/* 1480 * Vnode pointer to File handle 1481 */ 1482/* ARGSUSED */ 1483static int 1484ext2_vptofh(struct vop_vptofh_args *ap) 1485{ 1486 struct inode *ip; 1487 struct ufid *ufhp; 1488 1489 ip = VTOI(ap->a_vp); 1490 ufhp = (struct ufid *)ap->a_fhp; 1491 ufhp->ufid_len = sizeof(struct ufid); 1492 ufhp->ufid_ino = ip->i_number; 1493 ufhp->ufid_gen = ip->i_gen; 1494 return (0); 1495} 1496 1497/* 1498 * Initialize the vnode associated with a new inode, handle aliased 1499 * vnodes. 1500 */ 1501int 1502ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1503{ 1504 struct inode *ip; 1505 struct vnode *vp; 1506 1507 vp = *vpp; 1508 ip = VTOI(vp); 1509 vp->v_type = IFTOVT(ip->i_mode); 1510 if (vp->v_type == VFIFO) 1511 vp->v_op = fifoops; 1512 1513 if (ip->i_number == EXT2_ROOTINO) 1514 vp->v_vflag |= VV_ROOT; 1515 ip->i_modrev = init_va_filerev(); 1516 *vpp = vp; 1517 return (0); 1518} 1519 1520/* 1521 * Allocate a new inode. 1522 */ 1523static int 1524ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1525 struct componentname *cnp) 1526{ 1527 struct inode *ip, *pdir; 1528 struct vnode *tvp; 1529 int error; 1530 1531 pdir = VTOI(dvp); 1532#ifdef INVARIANTS 1533 if ((cnp->cn_flags & HASBUF) == 0) 1534 panic("ext2_makeinode: no name"); 1535#endif 1536 *vpp = NULL; 1537 if ((mode & IFMT) == 0) 1538 mode |= IFREG; 1539 1540 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1541 if (error) { 1542 return (error); 1543 } 1544 ip = VTOI(tvp); 1545 ip->i_gid = pdir->i_gid; 1546#ifdef SUIDDIR 1547 { 1548 /* 1549 * if we are 1550 * not the owner of the directory, 1551 * and we are hacking owners here, (only do this where told to) 1552 * and we are not giving it TOO root, (would subvert quotas) 1553 * then go ahead and give it to the other user. 1554 * Note that this drops off the execute bits for security. 1555 */ 1556 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1557 (pdir->i_mode & ISUID) && 1558 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1559 ip->i_uid = pdir->i_uid; 1560 mode &= ~07111; 1561 } else { 1562 ip->i_uid = cnp->cn_cred->cr_uid; 1563 } 1564 } 1565#else 1566 ip->i_uid = cnp->cn_cred->cr_uid; 1567#endif 1568 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1569 ip->i_mode = mode; 1570 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1571 ip->i_nlink = 1; 1572 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1573 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1574 ip->i_mode &= ~ISGID; 1575 } 1576 1577 if (cnp->cn_flags & ISWHITEOUT) 1578 ip->i_flags |= UF_OPAQUE; 1579 1580 /* 1581 * Make sure inode goes to disk before directory entry. 1582 */ 1583 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1584 if (error) 1585 goto bad; 1586 error = ext2_direnter(ip, dvp, cnp); 1587 if (error) 1588 goto bad; 1589 1590 *vpp = tvp; 1591 return (0); 1592 1593bad: 1594 /* 1595 * Write error occurred trying to update the inode 1596 * or the directory so must deallocate the inode. 1597 */ 1598 ip->i_nlink = 0; 1599 ip->i_flag |= IN_CHANGE; 1600 vput(tvp); 1601 return (error); 1602} 1603 1604/* 1605 * Vnode op for reading. 1606 */ 1607static int 1608ext2_read(struct vop_read_args *ap) 1609{ 1610 struct vnode *vp; 1611 struct inode *ip; 1612 int error; 1613 1614 vp = ap->a_vp; 1615 ip = VTOI(vp); 1616 1617 /*EXT4_EXT_LOCK(ip);*/ 1618 if (ip->i_flag & IN_E4EXTENTS) 1619 error = ext4_ext_read(ap); 1620 else 1621 error = ext2_ind_read(ap); 1622 /*EXT4_EXT_UNLOCK(ip);*/ 1623 return (error); 1624} 1625 1626/* 1627 * Vnode op for reading. 1628 */ 1629static int 1630ext2_ind_read(struct vop_read_args *ap) 1631{ 1632 struct vnode *vp; 1633 struct inode *ip; 1634 struct uio *uio; 1635 struct m_ext2fs *fs; 1636 struct buf *bp; 1637 daddr_t lbn, nextlbn; 1638 off_t bytesinfile; 1639 long size, xfersize, blkoffset; 1640 int error, orig_resid, seqcount; 1641 int ioflag; 1642 1643 vp = ap->a_vp; 1644 uio = ap->a_uio; 1645 ioflag = ap->a_ioflag; 1646 1647 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1648 ip = VTOI(vp); 1649 1650#ifdef INVARIANTS 1651 if (uio->uio_rw != UIO_READ) 1652 panic("%s: mode", "ext2_read"); 1653 1654 if (vp->v_type == VLNK) { 1655 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1656 panic("%s: short symlink", "ext2_read"); 1657 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1658 panic("%s: type %d", "ext2_read", vp->v_type); 1659#endif 1660 orig_resid = uio->uio_resid; 1661 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1662 if (orig_resid == 0) 1663 return (0); 1664 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1665 fs = ip->i_e2fs; 1666 if (uio->uio_offset < ip->i_size && 1667 uio->uio_offset >= fs->e2fs_maxfilesize) 1668 return (EOVERFLOW); 1669 1670 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1671 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1672 break; 1673 lbn = lblkno(fs, uio->uio_offset); 1674 nextlbn = lbn + 1; 1675 size = blksize(fs, ip, lbn); 1676 blkoffset = blkoff(fs, uio->uio_offset); 1677 1678 xfersize = fs->e2fs_fsize - blkoffset; 1679 if (uio->uio_resid < xfersize) 1680 xfersize = uio->uio_resid; 1681 if (bytesinfile < xfersize) 1682 xfersize = bytesinfile; 1683 1684 if (lblktosize(fs, nextlbn) >= ip->i_size) 1685 error = bread(vp, lbn, size, NOCRED, &bp); 1686 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 1687 error = cluster_read(vp, ip->i_size, lbn, size, 1688 NOCRED, blkoffset + uio->uio_resid, seqcount, 1689 0, &bp); 1690 } else if (seqcount > 1) { 1691 u_int nextsize = blksize(fs, ip, nextlbn); 1692 error = breadn(vp, lbn, 1693 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1694 } else 1695 error = bread(vp, lbn, size, NOCRED, &bp); 1696 if (error) { 1697 brelse(bp); 1698 bp = NULL; 1699 break; 1700 } 1701 1702 /* 1703 * If IO_DIRECT then set B_DIRECT for the buffer. This 1704 * will cause us to attempt to release the buffer later on 1705 * and will cause the buffer cache to attempt to free the 1706 * underlying pages. 1707 */ 1708 if (ioflag & IO_DIRECT) 1709 bp->b_flags |= B_DIRECT; 1710 1711 /* 1712 * We should only get non-zero b_resid when an I/O error 1713 * has occurred, which should cause us to break above. 1714 * However, if the short read did not cause an error, 1715 * then we want to ensure that we do not uiomove bad 1716 * or uninitialized data. 1717 */ 1718 size -= bp->b_resid; 1719 if (size < xfersize) { 1720 if (size == 0) 1721 break; 1722 xfersize = size; 1723 } 1724 error = uiomove((char *)bp->b_data + blkoffset, 1725 (int)xfersize, uio); 1726 if (error) 1727 break; 1728 1729 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1730 /* 1731 * If it's VMIO or direct I/O, then we don't 1732 * need the buf, mark it available for 1733 * freeing. If it's non-direct VMIO, the VM has 1734 * the data. 1735 */ 1736 bp->b_flags |= B_RELBUF; 1737 brelse(bp); 1738 } else { 1739 /* 1740 * Otherwise let whoever 1741 * made the request take care of 1742 * freeing it. We just queue 1743 * it onto another list. 1744 */ 1745 bqrelse(bp); 1746 } 1747 } 1748 1749 /* 1750 * This can only happen in the case of an error 1751 * because the loop above resets bp to NULL on each iteration 1752 * and on normal completion has not set a new value into it. 1753 * so it must have come from a 'break' statement 1754 */ 1755 if (bp != NULL) { 1756 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1757 bp->b_flags |= B_RELBUF; 1758 brelse(bp); 1759 } else { 1760 bqrelse(bp); 1761 } 1762 } 1763 1764 if ((error == 0 || uio->uio_resid != orig_resid) && 1765 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1766 ip->i_flag |= IN_ACCESS; 1767 return (error); 1768} 1769 1770static int 1771ext2_ioctl(struct vop_ioctl_args *ap) 1772{ 1773 1774 switch (ap->a_command) { 1775 case FIOSEEKDATA: 1776 case FIOSEEKHOLE: 1777 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1778 (off_t *)ap->a_data, ap->a_cred)); 1779 default: 1780 return (ENOTTY); 1781 } 1782} 1783 1784/* 1785 * this function handles ext4 extents block mapping 1786 */ 1787static int 1788ext4_ext_read(struct vop_read_args *ap) 1789{ 1790 struct vnode *vp; 1791 struct inode *ip; 1792 struct uio *uio; 1793 struct m_ext2fs *fs; 1794 struct buf *bp; 1795 struct ext4_extent nex, *ep; 1796 struct ext4_extent_path path; 1797 daddr_t lbn, newblk; 1798 off_t bytesinfile; 1799 int cache_type; 1800 ssize_t orig_resid; 1801 int error; 1802 long size, xfersize, blkoffset; 1803 1804 vp = ap->a_vp; 1805 ip = VTOI(vp); 1806 uio = ap->a_uio; 1807 memset(&path, 0, sizeof(path)); 1808 1809 orig_resid = uio->uio_resid; 1810 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1811 if (orig_resid == 0) 1812 return (0); 1813 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1814 fs = ip->i_e2fs; 1815 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1816 return (EOVERFLOW); 1817 1818 while (uio->uio_resid > 0) { 1819 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1820 break; 1821 lbn = lblkno(fs, uio->uio_offset); 1822 size = blksize(fs, ip, lbn); 1823 blkoffset = blkoff(fs, uio->uio_offset); 1824 1825 xfersize = fs->e2fs_fsize - blkoffset; 1826 xfersize = MIN(xfersize, uio->uio_resid); 1827 xfersize = MIN(xfersize, bytesinfile); 1828 1829 /* get block from ext4 extent cache */ 1830 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1831 switch (cache_type) { 1832 case EXT4_EXT_CACHE_NO: 1833 ext4_ext_find_extent(fs, ip, lbn, &path); 1834 ep = path.ep_ext; 1835 if (ep == NULL) 1836 return (EIO); 1837 1838 ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN); 1839 1840 newblk = lbn - ep->e_blk + (ep->e_start_lo | 1841 (daddr_t)ep->e_start_hi << 32); 1842 1843 if (path.ep_bp != NULL) { 1844 brelse(path.ep_bp); 1845 path.ep_bp = NULL; 1846 } 1847 break; 1848 1849 case EXT4_EXT_CACHE_GAP: 1850 /* block has not been allocated yet */ 1851 return (0); 1852 1853 case EXT4_EXT_CACHE_IN: 1854 newblk = lbn - nex.e_blk + (nex.e_start_lo | 1855 (daddr_t)nex.e_start_hi << 32); 1856 break; 1857 1858 default: 1859 panic("%s: invalid cache type", __func__); 1860 } 1861 1862 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp); 1863 if (error) { 1864 brelse(bp); 1865 return (error); 1866 } 1867 1868 size -= bp->b_resid; 1869 if (size < xfersize) { 1870 if (size == 0) { 1871 bqrelse(bp); 1872 break; 1873 } 1874 xfersize = size; 1875 } 1876 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio); 1877 bqrelse(bp); 1878 if (error) 1879 return (error); 1880 } 1881 1882 return (0); 1883} 1884 1885/* 1886 * Vnode op for writing. 1887 */ 1888static int 1889ext2_write(struct vop_write_args *ap) 1890{ 1891 struct vnode *vp; 1892 struct uio *uio; 1893 struct inode *ip; 1894 struct m_ext2fs *fs; 1895 struct buf *bp; 1896 daddr_t lbn; 1897 off_t osize; 1898 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 1899 1900 ioflag = ap->a_ioflag; 1901 uio = ap->a_uio; 1902 vp = ap->a_vp; 1903 1904 seqcount = ioflag >> IO_SEQSHIFT; 1905 ip = VTOI(vp); 1906 1907#ifdef INVARIANTS 1908 if (uio->uio_rw != UIO_WRITE) 1909 panic("%s: mode", "ext2_write"); 1910#endif 1911 1912 switch (vp->v_type) { 1913 case VREG: 1914 if (ioflag & IO_APPEND) 1915 uio->uio_offset = ip->i_size; 1916 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 1917 return (EPERM); 1918 /* FALLTHROUGH */ 1919 case VLNK: 1920 break; 1921 case VDIR: 1922 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 1923 if ((ioflag & IO_SYNC) == 0) 1924 panic("ext2_write: nonsync dir write"); 1925 break; 1926 default: 1927 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 1928 vp->v_type, (intmax_t)uio->uio_offset, 1929 (intmax_t)uio->uio_resid); 1930 } 1931 1932 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 1933 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 1934 fs = ip->i_e2fs; 1935 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 1936 return (EFBIG); 1937 /* 1938 * Maybe this should be above the vnode op call, but so long as 1939 * file servers have no limits, I don't think it matters. 1940 */ 1941 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 1942 return (EFBIG); 1943 1944 resid = uio->uio_resid; 1945 osize = ip->i_size; 1946 if (seqcount > BA_SEQMAX) 1947 flags = BA_SEQMAX << BA_SEQSHIFT; 1948 else 1949 flags = seqcount << BA_SEQSHIFT; 1950 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1951 flags |= IO_SYNC; 1952 1953 for (error = 0; uio->uio_resid > 0;) { 1954 lbn = lblkno(fs, uio->uio_offset); 1955 blkoffset = blkoff(fs, uio->uio_offset); 1956 xfersize = fs->e2fs_fsize - blkoffset; 1957 if (uio->uio_resid < xfersize) 1958 xfersize = uio->uio_resid; 1959 if (uio->uio_offset + xfersize > ip->i_size) 1960 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 1961 1962 /* 1963 * We must perform a read-before-write if the transfer size 1964 * does not cover the entire buffer. 1965 */ 1966 if (fs->e2fs_bsize > xfersize) 1967 flags |= BA_CLRBUF; 1968 else 1969 flags &= ~BA_CLRBUF; 1970 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 1971 ap->a_cred, &bp, flags); 1972 if (error != 0) 1973 break; 1974 1975 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 1976 bp->b_flags |= B_NOCACHE; 1977 if (uio->uio_offset + xfersize > ip->i_size) 1978 ip->i_size = uio->uio_offset + xfersize; 1979 size = blksize(fs, ip, lbn) - bp->b_resid; 1980 if (size < xfersize) 1981 xfersize = size; 1982 1983 error = 1984 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1985 /* 1986 * If the buffer is not already filled and we encounter an 1987 * error while trying to fill it, we have to clear out any 1988 * garbage data from the pages instantiated for the buffer. 1989 * If we do not, a failed uiomove() during a write can leave 1990 * the prior contents of the pages exposed to a userland mmap. 1991 * 1992 * Note that we need only clear buffers with a transfer size 1993 * equal to the block size because buffers with a shorter 1994 * transfer size were cleared above by the call to ext2_balloc() 1995 * with the BA_CLRBUF flag set. 1996 * 1997 * If the source region for uiomove identically mmaps the 1998 * buffer, uiomove() performed the NOP copy, and the buffer 1999 * content remains valid because the page fault handler 2000 * validated the pages. 2001 */ 2002 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2003 fs->e2fs_bsize == xfersize) 2004 vfs_bio_clrbuf(bp); 2005 if (ioflag & (IO_VMIO|IO_DIRECT)) { 2006 bp->b_flags |= B_RELBUF; 2007 } 2008 2009 /* 2010 * If IO_SYNC each buffer is written synchronously. Otherwise 2011 * if we have a severe page deficiency write the buffer 2012 * asynchronously. Otherwise try to cluster, and if that 2013 * doesn't do it then either do an async write (if O_DIRECT), 2014 * or a delayed write (if not). 2015 */ 2016 if (ioflag & IO_SYNC) { 2017 (void)bwrite(bp); 2018 } else if (vm_page_count_severe() || 2019 buf_dirty_count_severe() || 2020 (ioflag & IO_ASYNC)) { 2021 bp->b_flags |= B_CLUSTEROK; 2022 bawrite(bp); 2023 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2024 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2025 bp->b_flags |= B_CLUSTEROK; 2026 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2027 } else { 2028 bawrite(bp); 2029 } 2030 } else if (ioflag & IO_DIRECT) { 2031 bp->b_flags |= B_CLUSTEROK; 2032 bawrite(bp); 2033 } else { 2034 bp->b_flags |= B_CLUSTEROK; 2035 bdwrite(bp); 2036 } 2037 if (error || xfersize == 0) 2038 break; 2039 } 2040 /* 2041 * If we successfully wrote any data, and we are not the superuser 2042 * we clear the setuid and setgid bits as a precaution against 2043 * tampering. 2044 */ 2045 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2046 ap->a_cred) { 2047 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2048 ip->i_mode &= ~(ISUID | ISGID); 2049 } 2050 if (error) { 2051 if (ioflag & IO_UNIT) { 2052 (void)ext2_truncate(vp, osize, 2053 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2054 uio->uio_offset -= resid - uio->uio_resid; 2055 uio->uio_resid = resid; 2056 } 2057 } 2058 if (uio->uio_resid != resid) { 2059 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2060 if (ioflag & IO_SYNC) 2061 error = ext2_update(vp, 1); 2062 } 2063 return (error); 2064} 2065