ext2_vnops.c revision 272531
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 272531 2014-10-04 17:46:04Z 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/rwlock.h> 58#include <sys/mount.h> 59#include <sys/unistd.h> 60#include <sys/time.h> 61#include <sys/vnode.h> 62#include <sys/namei.h> 63#include <sys/lockf.h> 64#include <sys/event.h> 65#include <sys/conf.h> 66#include <sys/file.h> 67 68#include <vm/vm.h> 69#include <vm/vm_param.h> 70#include <vm/vm_extern.h> 71#include <vm/vm_object.h> 72#include <vm/vm_page.h> 73#include <vm/vm_pager.h> 74#include <vm/vnode_pager.h> 75 76#include "opt_directio.h" 77 78#include <ufs/ufs/dir.h> 79 80#include <fs/ext2fs/fs.h> 81#include <fs/ext2fs/inode.h> 82#include <fs/ext2fs/ext2_extern.h> 83#include <fs/ext2fs/ext2fs.h> 84#include <fs/ext2fs/ext2_dinode.h> 85#include <fs/ext2fs/ext2_dir.h> 86#include <fs/ext2fs/ext2_mount.h> 87 88static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *); 89static void ext2_itimes_locked(struct vnode *); 90static int ext4_ext_read(struct vop_read_args *); 91static int ext2_ind_read(struct vop_read_args *); 92 93static vop_access_t ext2_access; 94static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *); 95static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *, 96 struct thread *); 97static vop_close_t ext2_close; 98static vop_create_t ext2_create; 99static vop_fsync_t ext2_fsync; 100static vop_getpages_t ext2_getpages; 101static vop_getattr_t ext2_getattr; 102static vop_ioctl_t ext2_ioctl; 103static vop_link_t ext2_link; 104static vop_mkdir_t ext2_mkdir; 105static vop_mknod_t ext2_mknod; 106static vop_open_t ext2_open; 107static vop_pathconf_t ext2_pathconf; 108static vop_print_t ext2_print; 109static vop_read_t ext2_read; 110static vop_readlink_t ext2_readlink; 111static vop_remove_t ext2_remove; 112static vop_rename_t ext2_rename; 113static vop_rmdir_t ext2_rmdir; 114static vop_setattr_t ext2_setattr; 115static vop_strategy_t ext2_strategy; 116static vop_symlink_t ext2_symlink; 117static vop_write_t ext2_write; 118static vop_vptofh_t ext2_vptofh; 119static vop_close_t ext2fifo_close; 120static vop_kqfilter_t ext2fifo_kqfilter; 121 122/* Global vfs data structures for ext2. */ 123struct vop_vector ext2_vnodeops = { 124 .vop_default = &default_vnodeops, 125 .vop_access = ext2_access, 126 .vop_bmap = ext2_bmap, 127 .vop_cachedlookup = ext2_lookup, 128 .vop_close = ext2_close, 129 .vop_create = ext2_create, 130 .vop_fsync = ext2_fsync, 131 .vop_getpages = ext2_getpages, 132 .vop_getattr = ext2_getattr, 133 .vop_inactive = ext2_inactive, 134 .vop_ioctl = ext2_ioctl, 135 .vop_link = ext2_link, 136 .vop_lookup = vfs_cache_lookup, 137 .vop_mkdir = ext2_mkdir, 138 .vop_mknod = ext2_mknod, 139 .vop_open = ext2_open, 140 .vop_pathconf = ext2_pathconf, 141 .vop_poll = vop_stdpoll, 142 .vop_print = ext2_print, 143 .vop_read = ext2_read, 144 .vop_readdir = ext2_readdir, 145 .vop_readlink = ext2_readlink, 146 .vop_reallocblks = ext2_reallocblks, 147 .vop_reclaim = ext2_reclaim, 148 .vop_remove = ext2_remove, 149 .vop_rename = ext2_rename, 150 .vop_rmdir = ext2_rmdir, 151 .vop_setattr = ext2_setattr, 152 .vop_strategy = ext2_strategy, 153 .vop_symlink = ext2_symlink, 154 .vop_write = ext2_write, 155 .vop_vptofh = ext2_vptofh, 156}; 157 158struct vop_vector ext2_fifoops = { 159 .vop_default = &fifo_specops, 160 .vop_access = ext2_access, 161 .vop_close = ext2fifo_close, 162 .vop_fsync = ext2_fsync, 163 .vop_getattr = ext2_getattr, 164 .vop_inactive = ext2_inactive, 165 .vop_kqfilter = ext2fifo_kqfilter, 166 .vop_print = ext2_print, 167 .vop_read = VOP_PANIC, 168 .vop_reclaim = ext2_reclaim, 169 .vop_setattr = ext2_setattr, 170 .vop_write = VOP_PANIC, 171 .vop_vptofh = ext2_vptofh, 172}; 173 174/* 175 * A virgin directory (no blushing please). 176 * Note that the type and namlen fields are reversed relative to ext2. 177 * Also, we don't use `struct odirtemplate', since it would just cause 178 * endianness problems. 179 */ 180static struct dirtemplate mastertemplate = { 181 0, 12, 1, EXT2_FT_DIR, ".", 182 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".." 183}; 184static struct dirtemplate omastertemplate = { 185 0, 12, 1, EXT2_FT_UNKNOWN, ".", 186 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".." 187}; 188 189static void 190ext2_itimes_locked(struct vnode *vp) 191{ 192 struct inode *ip; 193 struct timespec ts; 194 195 ASSERT_VI_LOCKED(vp, __func__); 196 197 ip = VTOI(vp); 198 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0) 199 return; 200 if ((vp->v_type == VBLK || vp->v_type == VCHR)) 201 ip->i_flag |= IN_LAZYMOD; 202 else 203 ip->i_flag |= IN_MODIFIED; 204 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 205 vfs_timestamp(&ts); 206 if (ip->i_flag & IN_ACCESS) { 207 ip->i_atime = ts.tv_sec; 208 ip->i_atimensec = ts.tv_nsec; 209 } 210 if (ip->i_flag & IN_UPDATE) { 211 ip->i_mtime = ts.tv_sec; 212 ip->i_mtimensec = ts.tv_nsec; 213 ip->i_modrev++; 214 } 215 if (ip->i_flag & IN_CHANGE) { 216 ip->i_ctime = ts.tv_sec; 217 ip->i_ctimensec = ts.tv_nsec; 218 } 219 } 220 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); 221} 222 223void 224ext2_itimes(struct vnode *vp) 225{ 226 227 VI_LOCK(vp); 228 ext2_itimes_locked(vp); 229 VI_UNLOCK(vp); 230} 231 232/* 233 * Create a regular file 234 */ 235static int 236ext2_create(struct vop_create_args *ap) 237{ 238 int error; 239 240 error = 241 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), 242 ap->a_dvp, ap->a_vpp, ap->a_cnp); 243 if (error) 244 return (error); 245 return (0); 246} 247 248static int 249ext2_open(struct vop_open_args *ap) 250{ 251 252 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 253 return (EOPNOTSUPP); 254 255 /* 256 * Files marked append-only must be opened for appending. 257 */ 258 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 259 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 260 return (EPERM); 261 262 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 263 264 return (0); 265} 266 267/* 268 * Close called. 269 * 270 * Update the times on the inode. 271 */ 272static int 273ext2_close(struct vop_close_args *ap) 274{ 275 struct vnode *vp = ap->a_vp; 276 277 VI_LOCK(vp); 278 if (vp->v_usecount > 1) 279 ext2_itimes_locked(vp); 280 VI_UNLOCK(vp); 281 return (0); 282} 283 284static int 285ext2_access(struct vop_access_args *ap) 286{ 287 struct vnode *vp = ap->a_vp; 288 struct inode *ip = VTOI(vp); 289 accmode_t accmode = ap->a_accmode; 290 int error; 291 292 if (vp->v_type == VBLK || vp->v_type == VCHR) 293 return (EOPNOTSUPP); 294 295 /* 296 * Disallow write attempts on read-only file systems; 297 * unless the file is a socket, fifo, or a block or 298 * character device resident on the file system. 299 */ 300 if (accmode & VWRITE) { 301 switch (vp->v_type) { 302 case VDIR: 303 case VLNK: 304 case VREG: 305 if (vp->v_mount->mnt_flag & MNT_RDONLY) 306 return (EROFS); 307 break; 308 default: 309 break; 310 } 311 } 312 313 /* If immutable bit set, nobody gets to write it. */ 314 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 315 return (EPERM); 316 317 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 318 ap->a_accmode, ap->a_cred, NULL); 319 return (error); 320} 321 322static int 323ext2_getattr(struct vop_getattr_args *ap) 324{ 325 struct vnode *vp = ap->a_vp; 326 struct inode *ip = VTOI(vp); 327 struct vattr *vap = ap->a_vap; 328 329 ext2_itimes(vp); 330 /* 331 * Copy from inode table 332 */ 333 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 334 vap->va_fileid = ip->i_number; 335 vap->va_mode = ip->i_mode & ~IFMT; 336 vap->va_nlink = ip->i_nlink; 337 vap->va_uid = ip->i_uid; 338 vap->va_gid = ip->i_gid; 339 vap->va_rdev = ip->i_rdev; 340 vap->va_size = ip->i_size; 341 vap->va_atime.tv_sec = ip->i_atime; 342 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 343 vap->va_mtime.tv_sec = ip->i_mtime; 344 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 345 vap->va_ctime.tv_sec = ip->i_ctime; 346 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 347 if E2DI_HAS_XTIME(ip) { 348 vap->va_birthtime.tv_sec = ip->i_birthtime; 349 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 350 } 351 vap->va_flags = ip->i_flags; 352 vap->va_gen = ip->i_gen; 353 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 354 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 355 vap->va_type = IFTOVT(ip->i_mode); 356 vap->va_filerev = ip->i_modrev; 357 return (0); 358} 359 360/* 361 * Set attribute vnode op. called from several syscalls 362 */ 363static int 364ext2_setattr(struct vop_setattr_args *ap) 365{ 366 struct vattr *vap = ap->a_vap; 367 struct vnode *vp = ap->a_vp; 368 struct inode *ip = VTOI(vp); 369 struct ucred *cred = ap->a_cred; 370 struct thread *td = curthread; 371 int error; 372 373 /* 374 * Check for unsettable attributes. 375 */ 376 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 377 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 378 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 379 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 380 return (EINVAL); 381 } 382 if (vap->va_flags != VNOVAL) { 383 /* Disallow flags not supported by ext2fs. */ 384 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 385 return (EOPNOTSUPP); 386 387 if (vp->v_mount->mnt_flag & MNT_RDONLY) 388 return (EROFS); 389 /* 390 * Callers may only modify the file flags on objects they 391 * have VADMIN rights for. 392 */ 393 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 394 return (error); 395 /* 396 * Unprivileged processes and privileged processes in 397 * jail() are not permitted to unset system flags, or 398 * modify flags if any system flags are set. 399 * Privileged non-jail processes may not modify system flags 400 * if securelevel > 0 and any existing system flags are set. 401 */ 402 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 403 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 404 error = securelevel_gt(cred, 0); 405 if (error) 406 return (error); 407 } 408 } else { 409 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 410 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 411 return (EPERM); 412 } 413 ip->i_flags = vap->va_flags; 414 ip->i_flag |= IN_CHANGE; 415 if (ip->i_flags & (IMMUTABLE | APPEND)) 416 return (0); 417 } 418 if (ip->i_flags & (IMMUTABLE | APPEND)) 419 return (EPERM); 420 /* 421 * Go through the fields and update iff not VNOVAL. 422 */ 423 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 424 if (vp->v_mount->mnt_flag & MNT_RDONLY) 425 return (EROFS); 426 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 427 td)) != 0) 428 return (error); 429 } 430 if (vap->va_size != VNOVAL) { 431 /* 432 * Disallow write attempts on read-only file systems; 433 * unless the file is a socket, fifo, or a block or 434 * character device resident on the file system. 435 */ 436 switch (vp->v_type) { 437 case VDIR: 438 return (EISDIR); 439 case VLNK: 440 case VREG: 441 if (vp->v_mount->mnt_flag & MNT_RDONLY) 442 return (EROFS); 443 break; 444 default: 445 break; 446 } 447 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 448 return (error); 449 } 450 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 451 if (vp->v_mount->mnt_flag & MNT_RDONLY) 452 return (EROFS); 453 /* 454 * From utimes(2): 455 * If times is NULL, ... The caller must be the owner of 456 * the file, have permission to write the file, or be the 457 * super-user. 458 * If times is non-NULL, ... The caller must be the owner of 459 * the file or be the super-user. 460 */ 461 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 462 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 463 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 464 return (error); 465 if (vap->va_atime.tv_sec != VNOVAL) 466 ip->i_flag |= IN_ACCESS; 467 if (vap->va_mtime.tv_sec != VNOVAL) 468 ip->i_flag |= IN_CHANGE | IN_UPDATE; 469 ext2_itimes(vp); 470 if (vap->va_atime.tv_sec != VNOVAL) { 471 ip->i_atime = vap->va_atime.tv_sec; 472 ip->i_atimensec = vap->va_atime.tv_nsec; 473 } 474 if (vap->va_mtime.tv_sec != VNOVAL) { 475 ip->i_mtime = vap->va_mtime.tv_sec; 476 ip->i_mtimensec = vap->va_mtime.tv_nsec; 477 } 478 ip->i_birthtime = vap->va_birthtime.tv_sec; 479 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 480 error = ext2_update(vp, 0); 481 if (error) 482 return (error); 483 } 484 error = 0; 485 if (vap->va_mode != (mode_t)VNOVAL) { 486 if (vp->v_mount->mnt_flag & MNT_RDONLY) 487 return (EROFS); 488 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 489 } 490 return (error); 491} 492 493/* 494 * Change the mode on a file. 495 * Inode must be locked before calling. 496 */ 497static int 498ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 499{ 500 struct inode *ip = VTOI(vp); 501 int error; 502 503 /* 504 * To modify the permissions on a file, must possess VADMIN 505 * for that file. 506 */ 507 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 508 return (error); 509 /* 510 * Privileged processes may set the sticky bit on non-directories, 511 * as well as set the setgid bit on a file with a group that the 512 * process is not a member of. 513 */ 514 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 515 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 516 if (error) 517 return (EFTYPE); 518 } 519 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 520 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 521 if (error) 522 return (error); 523 } 524 ip->i_mode &= ~ALLPERMS; 525 ip->i_mode |= (mode & ALLPERMS); 526 ip->i_flag |= IN_CHANGE; 527 return (0); 528} 529 530/* 531 * Perform chown operation on inode ip; 532 * inode must be locked prior to call. 533 */ 534static int 535ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 536 struct thread *td) 537{ 538 struct inode *ip = VTOI(vp); 539 uid_t ouid; 540 gid_t ogid; 541 int error = 0; 542 543 if (uid == (uid_t)VNOVAL) 544 uid = ip->i_uid; 545 if (gid == (gid_t)VNOVAL) 546 gid = ip->i_gid; 547 /* 548 * To modify the ownership of a file, must possess VADMIN 549 * for that file. 550 */ 551 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 552 return (error); 553 /* 554 * To change the owner of a file, or change the group of a file 555 * to a group of which we are not a member, the caller must 556 * have privilege. 557 */ 558 if (uid != ip->i_uid || (gid != ip->i_gid && 559 !groupmember(gid, cred))) { 560 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 561 if (error) 562 return (error); 563 } 564 ogid = ip->i_gid; 565 ouid = ip->i_uid; 566 ip->i_gid = gid; 567 ip->i_uid = uid; 568 ip->i_flag |= IN_CHANGE; 569 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 570 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 571 ip->i_mode &= ~(ISUID | ISGID); 572 } 573 return (0); 574} 575 576/* 577 * Synch an open file. 578 */ 579/* ARGSUSED */ 580static int 581ext2_fsync(struct vop_fsync_args *ap) 582{ 583 /* 584 * Flush all dirty buffers associated with a vnode. 585 */ 586 587 vop_stdfsync(ap); 588 589 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 590} 591 592/* 593 * Mknod vnode call 594 */ 595/* ARGSUSED */ 596static int 597ext2_mknod(struct vop_mknod_args *ap) 598{ 599 struct vattr *vap = ap->a_vap; 600 struct vnode **vpp = ap->a_vpp; 601 struct inode *ip; 602 ino_t ino; 603 int error; 604 605 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 606 ap->a_dvp, vpp, ap->a_cnp); 607 if (error) 608 return (error); 609 ip = VTOI(*vpp); 610 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 611 if (vap->va_rdev != VNOVAL) { 612 /* 613 * Want to be able to use this to make badblock 614 * inodes, so don't truncate the dev number. 615 */ 616 ip->i_rdev = vap->va_rdev; 617 } 618 /* 619 * Remove inode, then reload it through VFS_VGET so it is 620 * checked to see if it is an alias of an existing entry in 621 * the inode cache. XXX I don't believe this is necessary now. 622 */ 623 (*vpp)->v_type = VNON; 624 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 625 vgone(*vpp); 626 vput(*vpp); 627 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 628 if (error) { 629 *vpp = NULL; 630 return (error); 631 } 632 return (0); 633} 634 635static int 636ext2_remove(struct vop_remove_args *ap) 637{ 638 struct inode *ip; 639 struct vnode *vp = ap->a_vp; 640 struct vnode *dvp = ap->a_dvp; 641 int error; 642 643 ip = VTOI(vp); 644 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 645 (VTOI(dvp)->i_flags & APPEND)) { 646 error = EPERM; 647 goto out; 648 } 649 error = ext2_dirremove(dvp, ap->a_cnp); 650 if (error == 0) { 651 ip->i_nlink--; 652 ip->i_flag |= IN_CHANGE; 653 } 654out: 655 return (error); 656} 657 658/* 659 * link vnode call 660 */ 661static int 662ext2_link(struct vop_link_args *ap) 663{ 664 struct vnode *vp = ap->a_vp; 665 struct vnode *tdvp = ap->a_tdvp; 666 struct componentname *cnp = ap->a_cnp; 667 struct inode *ip; 668 int error; 669 670#ifdef INVARIANTS 671 if ((cnp->cn_flags & HASBUF) == 0) 672 panic("ext2_link: no name"); 673#endif 674 ip = VTOI(vp); 675 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 676 error = EMLINK; 677 goto out; 678 } 679 if (ip->i_flags & (IMMUTABLE | APPEND)) { 680 error = EPERM; 681 goto out; 682 } 683 ip->i_nlink++; 684 ip->i_flag |= IN_CHANGE; 685 error = ext2_update(vp, !DOINGASYNC(vp)); 686 if (!error) 687 error = ext2_direnter(ip, tdvp, cnp); 688 if (error) { 689 ip->i_nlink--; 690 ip->i_flag |= IN_CHANGE; 691 } 692out: 693 return (error); 694} 695 696/* 697 * Rename system call. 698 * rename("foo", "bar"); 699 * is essentially 700 * unlink("bar"); 701 * link("foo", "bar"); 702 * unlink("foo"); 703 * but ``atomically''. Can't do full commit without saving state in the 704 * inode on disk which isn't feasible at this time. Best we can do is 705 * always guarantee the target exists. 706 * 707 * Basic algorithm is: 708 * 709 * 1) Bump link count on source while we're linking it to the 710 * target. This also ensure the inode won't be deleted out 711 * from underneath us while we work (it may be truncated by 712 * a concurrent `trunc' or `open' for creation). 713 * 2) Link source to destination. If destination already exists, 714 * delete it first. 715 * 3) Unlink source reference to inode if still around. If a 716 * directory was moved and the parent of the destination 717 * is different from the source, patch the ".." entry in the 718 * directory. 719 */ 720static int 721ext2_rename(struct vop_rename_args *ap) 722{ 723 struct vnode *tvp = ap->a_tvp; 724 struct vnode *tdvp = ap->a_tdvp; 725 struct vnode *fvp = ap->a_fvp; 726 struct vnode *fdvp = ap->a_fdvp; 727 struct componentname *tcnp = ap->a_tcnp; 728 struct componentname *fcnp = ap->a_fcnp; 729 struct inode *ip, *xp, *dp; 730 struct dirtemplate dirbuf; 731 int doingdirectory = 0, oldparent = 0, newparent = 0; 732 int error = 0; 733 u_char namlen; 734 735#ifdef INVARIANTS 736 if ((tcnp->cn_flags & HASBUF) == 0 || 737 (fcnp->cn_flags & HASBUF) == 0) 738 panic("ext2_rename: no name"); 739#endif 740 /* 741 * Check for cross-device rename. 742 */ 743 if ((fvp->v_mount != tdvp->v_mount) || 744 (tvp && (fvp->v_mount != tvp->v_mount))) { 745 error = EXDEV; 746abortit: 747 if (tdvp == tvp) 748 vrele(tdvp); 749 else 750 vput(tdvp); 751 if (tvp) 752 vput(tvp); 753 vrele(fdvp); 754 vrele(fvp); 755 return (error); 756 } 757 758 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 759 (VTOI(tdvp)->i_flags & APPEND))) { 760 error = EPERM; 761 goto abortit; 762 } 763 764 /* 765 * Renaming a file to itself has no effect. The upper layers should 766 * not call us in that case. Temporarily just warn if they do. 767 */ 768 if (fvp == tvp) { 769 printf("ext2_rename: fvp == tvp (can't happen)\n"); 770 error = 0; 771 goto abortit; 772 } 773 774 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 775 goto abortit; 776 dp = VTOI(fdvp); 777 ip = VTOI(fvp); 778 if (ip->i_nlink >= EXT2_LINK_MAX) { 779 VOP_UNLOCK(fvp, 0); 780 error = EMLINK; 781 goto abortit; 782 } 783 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 784 || (dp->i_flags & APPEND)) { 785 VOP_UNLOCK(fvp, 0); 786 error = EPERM; 787 goto abortit; 788 } 789 if ((ip->i_mode & IFMT) == IFDIR) { 790 /* 791 * Avoid ".", "..", and aliases of "." for obvious reasons. 792 */ 793 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 794 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 795 (ip->i_flag & IN_RENAME)) { 796 VOP_UNLOCK(fvp, 0); 797 error = EINVAL; 798 goto abortit; 799 } 800 ip->i_flag |= IN_RENAME; 801 oldparent = dp->i_number; 802 doingdirectory++; 803 } 804 vrele(fdvp); 805 806 /* 807 * When the target exists, both the directory 808 * and target vnodes are returned locked. 809 */ 810 dp = VTOI(tdvp); 811 xp = NULL; 812 if (tvp) 813 xp = VTOI(tvp); 814 815 /* 816 * 1) Bump link count while we're moving stuff 817 * around. If we crash somewhere before 818 * completing our work, the link count 819 * may be wrong, but correctable. 820 */ 821 ip->i_nlink++; 822 ip->i_flag |= IN_CHANGE; 823 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 824 VOP_UNLOCK(fvp, 0); 825 goto bad; 826 } 827 828 /* 829 * If ".." must be changed (ie the directory gets a new 830 * parent) then the source directory must not be in the 831 * directory hierarchy above the target, as this would 832 * orphan everything below the source directory. Also 833 * the user must have write permission in the source so 834 * as to be able to change "..". We must repeat the call 835 * to namei, as the parent directory is unlocked by the 836 * call to checkpath(). 837 */ 838 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 839 VOP_UNLOCK(fvp, 0); 840 if (oldparent != dp->i_number) 841 newparent = dp->i_number; 842 if (doingdirectory && newparent) { 843 if (error) /* write access check above */ 844 goto bad; 845 if (xp != NULL) 846 vput(tvp); 847 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 848 if (error) 849 goto out; 850 VREF(tdvp); 851 error = relookup(tdvp, &tvp, tcnp); 852 if (error) 853 goto out; 854 vrele(tdvp); 855 dp = VTOI(tdvp); 856 xp = NULL; 857 if (tvp) 858 xp = VTOI(tvp); 859 } 860 /* 861 * 2) If target doesn't exist, link the target 862 * to the source and unlink the source. 863 * Otherwise, rewrite the target directory 864 * entry to reference the source inode and 865 * expunge the original entry's existence. 866 */ 867 if (xp == NULL) { 868 if (dp->i_devvp != ip->i_devvp) 869 panic("ext2_rename: EXDEV"); 870 /* 871 * Account for ".." in new directory. 872 * When source and destination have the same 873 * parent we don't fool with the link count. 874 */ 875 if (doingdirectory && newparent) { 876 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 877 error = EMLINK; 878 goto bad; 879 } 880 dp->i_nlink++; 881 dp->i_flag |= IN_CHANGE; 882 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 883 if (error) 884 goto bad; 885 } 886 error = ext2_direnter(ip, tdvp, tcnp); 887 if (error) { 888 if (doingdirectory && newparent) { 889 dp->i_nlink--; 890 dp->i_flag |= IN_CHANGE; 891 (void)ext2_update(tdvp, 1); 892 } 893 goto bad; 894 } 895 vput(tdvp); 896 } else { 897 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 898 panic("ext2_rename: EXDEV"); 899 /* 900 * Short circuit rename(foo, foo). 901 */ 902 if (xp->i_number == ip->i_number) 903 panic("ext2_rename: same file"); 904 /* 905 * If the parent directory is "sticky", then the user must 906 * own the parent directory, or the destination of the rename, 907 * otherwise the destination may not be changed (except by 908 * root). This implements append-only directories. 909 */ 910 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 911 tcnp->cn_cred->cr_uid != dp->i_uid && 912 xp->i_uid != tcnp->cn_cred->cr_uid) { 913 error = EPERM; 914 goto bad; 915 } 916 /* 917 * Target must be empty if a directory and have no links 918 * to it. Also, ensure source and target are compatible 919 * (both directories, or both not directories). 920 */ 921 if ((xp->i_mode&IFMT) == IFDIR) { 922 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 923 xp->i_nlink > 2) { 924 error = ENOTEMPTY; 925 goto bad; 926 } 927 if (!doingdirectory) { 928 error = ENOTDIR; 929 goto bad; 930 } 931 cache_purge(tdvp); 932 } else if (doingdirectory) { 933 error = EISDIR; 934 goto bad; 935 } 936 error = ext2_dirrewrite(dp, ip, tcnp); 937 if (error) 938 goto bad; 939 /* 940 * If the target directory is in the same 941 * directory as the source directory, 942 * decrement the link count on the parent 943 * of the target directory. 944 */ 945 if (doingdirectory && !newparent) { 946 dp->i_nlink--; 947 dp->i_flag |= IN_CHANGE; 948 } 949 vput(tdvp); 950 /* 951 * Adjust the link count of the target to 952 * reflect the dirrewrite above. If this is 953 * a directory it is empty and there are 954 * no links to it, so we can squash the inode and 955 * any space associated with it. We disallowed 956 * renaming over top of a directory with links to 957 * it above, as the remaining link would point to 958 * a directory without "." or ".." entries. 959 */ 960 xp->i_nlink--; 961 if (doingdirectory) { 962 if (--xp->i_nlink != 0) 963 panic("ext2_rename: linked directory"); 964 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 965 tcnp->cn_cred, tcnp->cn_thread); 966 } 967 xp->i_flag |= IN_CHANGE; 968 vput(tvp); 969 xp = NULL; 970 } 971 972 /* 973 * 3) Unlink the source. 974 */ 975 fcnp->cn_flags &= ~MODMASK; 976 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 977 VREF(fdvp); 978 error = relookup(fdvp, &fvp, fcnp); 979 if (error == 0) 980 vrele(fdvp); 981 if (fvp != NULL) { 982 xp = VTOI(fvp); 983 dp = VTOI(fdvp); 984 } else { 985 /* 986 * From name has disappeared. 987 */ 988 if (doingdirectory) 989 panic("ext2_rename: lost dir entry"); 990 vrele(ap->a_fvp); 991 return (0); 992 } 993 /* 994 * Ensure that the directory entry still exists and has not 995 * changed while the new name has been entered. If the source is 996 * a file then the entry may have been unlinked or renamed. In 997 * either case there is no further work to be done. If the source 998 * is a directory then it cannot have been rmdir'ed; its link 999 * count of three would cause a rmdir to fail with ENOTEMPTY. 1000 * The IN_RENAME flag ensures that it cannot be moved by another 1001 * rename. 1002 */ 1003 if (xp != ip) { 1004 if (doingdirectory) 1005 panic("ext2_rename: lost dir entry"); 1006 } else { 1007 /* 1008 * If the source is a directory with a 1009 * new parent, the link count of the old 1010 * parent directory must be decremented 1011 * and ".." set to point to the new parent. 1012 */ 1013 if (doingdirectory && newparent) { 1014 dp->i_nlink--; 1015 dp->i_flag |= IN_CHANGE; 1016 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1017 sizeof(struct dirtemplate), (off_t)0, 1018 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1019 tcnp->cn_cred, NOCRED, NULL, NULL); 1020 if (error == 0) { 1021 /* Like ufs little-endian: */ 1022 namlen = dirbuf.dotdot_type; 1023 if (namlen != 2 || 1024 dirbuf.dotdot_name[0] != '.' || 1025 dirbuf.dotdot_name[1] != '.') { 1026 ext2_dirbad(xp, (doff_t)12, 1027 "rename: mangled dir"); 1028 } else { 1029 dirbuf.dotdot_ino = newparent; 1030 (void) vn_rdwr(UIO_WRITE, fvp, 1031 (caddr_t)&dirbuf, 1032 sizeof(struct dirtemplate), 1033 (off_t)0, UIO_SYSSPACE, 1034 IO_NODELOCKED | IO_SYNC | 1035 IO_NOMACCHECK, tcnp->cn_cred, 1036 NOCRED, NULL, NULL); 1037 cache_purge(fdvp); 1038 } 1039 } 1040 } 1041 error = ext2_dirremove(fdvp, fcnp); 1042 if (!error) { 1043 xp->i_nlink--; 1044 xp->i_flag |= IN_CHANGE; 1045 } 1046 xp->i_flag &= ~IN_RENAME; 1047 } 1048 if (dp) 1049 vput(fdvp); 1050 if (xp) 1051 vput(fvp); 1052 vrele(ap->a_fvp); 1053 return (error); 1054 1055bad: 1056 if (xp) 1057 vput(ITOV(xp)); 1058 vput(ITOV(dp)); 1059out: 1060 if (doingdirectory) 1061 ip->i_flag &= ~IN_RENAME; 1062 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1063 ip->i_nlink--; 1064 ip->i_flag |= IN_CHANGE; 1065 ip->i_flag &= ~IN_RENAME; 1066 vput(fvp); 1067 } else 1068 vrele(fvp); 1069 return (error); 1070} 1071 1072/* 1073 * Mkdir system call 1074 */ 1075static int 1076ext2_mkdir(struct vop_mkdir_args *ap) 1077{ 1078 struct vnode *dvp = ap->a_dvp; 1079 struct vattr *vap = ap->a_vap; 1080 struct componentname *cnp = ap->a_cnp; 1081 struct inode *ip, *dp; 1082 struct vnode *tvp; 1083 struct dirtemplate dirtemplate, *dtp; 1084 int error, dmode; 1085 1086#ifdef INVARIANTS 1087 if ((cnp->cn_flags & HASBUF) == 0) 1088 panic("ext2_mkdir: no name"); 1089#endif 1090 dp = VTOI(dvp); 1091 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1092 error = EMLINK; 1093 goto out; 1094 } 1095 dmode = vap->va_mode & 0777; 1096 dmode |= IFDIR; 1097 /* 1098 * Must simulate part of ext2_makeinode here to acquire the inode, 1099 * but not have it entered in the parent directory. The entry is 1100 * made later after writing "." and ".." entries. 1101 */ 1102 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1103 if (error) 1104 goto out; 1105 ip = VTOI(tvp); 1106 ip->i_gid = dp->i_gid; 1107#ifdef SUIDDIR 1108 { 1109 /* 1110 * if we are hacking owners here, (only do this where told to) 1111 * and we are not giving it TOO root, (would subvert quotas) 1112 * then go ahead and give it to the other user. 1113 * The new directory also inherits the SUID bit. 1114 * If user's UID and dir UID are the same, 1115 * 'give it away' so that the SUID is still forced on. 1116 */ 1117 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1118 (dp->i_mode & ISUID) && dp->i_uid) { 1119 dmode |= ISUID; 1120 ip->i_uid = dp->i_uid; 1121 } else { 1122 ip->i_uid = cnp->cn_cred->cr_uid; 1123 } 1124 } 1125#else 1126 ip->i_uid = cnp->cn_cred->cr_uid; 1127#endif 1128 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1129 ip->i_mode = dmode; 1130 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1131 ip->i_nlink = 2; 1132 if (cnp->cn_flags & ISWHITEOUT) 1133 ip->i_flags |= UF_OPAQUE; 1134 error = ext2_update(tvp, 1); 1135 1136 /* 1137 * Bump link count in parent directory 1138 * to reflect work done below. Should 1139 * be done before reference is created 1140 * so reparation is possible if we crash. 1141 */ 1142 dp->i_nlink++; 1143 dp->i_flag |= IN_CHANGE; 1144 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1145 if (error) 1146 goto bad; 1147 1148 /* Initialize directory with "." and ".." from static template. */ 1149 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1150 EXT2F_INCOMPAT_FTYPE)) 1151 dtp = &mastertemplate; 1152 else 1153 dtp = &omastertemplate; 1154 dirtemplate = *dtp; 1155 dirtemplate.dot_ino = ip->i_number; 1156 dirtemplate.dotdot_ino = dp->i_number; 1157 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1158 * so let's just redefine it - for this function only 1159 */ 1160#undef DIRBLKSIZ 1161#define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1162 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1163 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1164 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1165 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1166 NULL, NULL); 1167 if (error) { 1168 dp->i_nlink--; 1169 dp->i_flag |= IN_CHANGE; 1170 goto bad; 1171 } 1172 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1173 /* XXX should grow with balloc() */ 1174 panic("ext2_mkdir: blksize"); 1175 else { 1176 ip->i_size = DIRBLKSIZ; 1177 ip->i_flag |= IN_CHANGE; 1178 } 1179 1180 /* Directory set up, now install its entry in the parent directory. */ 1181 error = ext2_direnter(ip, dvp, cnp); 1182 if (error) { 1183 dp->i_nlink--; 1184 dp->i_flag |= IN_CHANGE; 1185 } 1186bad: 1187 /* 1188 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1189 * for us because we set the link count to 0. 1190 */ 1191 if (error) { 1192 ip->i_nlink = 0; 1193 ip->i_flag |= IN_CHANGE; 1194 vput(tvp); 1195 } else 1196 *ap->a_vpp = tvp; 1197out: 1198 return (error); 1199#undef DIRBLKSIZ 1200#define DIRBLKSIZ DEV_BSIZE 1201} 1202 1203/* 1204 * Rmdir system call. 1205 */ 1206static int 1207ext2_rmdir(struct vop_rmdir_args *ap) 1208{ 1209 struct vnode *vp = ap->a_vp; 1210 struct vnode *dvp = ap->a_dvp; 1211 struct componentname *cnp = ap->a_cnp; 1212 struct inode *ip, *dp; 1213 int error; 1214 1215 ip = VTOI(vp); 1216 dp = VTOI(dvp); 1217 1218 /* 1219 * Verify the directory is empty (and valid). 1220 * (Rmdir ".." won't be valid since 1221 * ".." will contain a reference to 1222 * the current directory and thus be 1223 * non-empty.) 1224 */ 1225 error = 0; 1226 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1227 error = ENOTEMPTY; 1228 goto out; 1229 } 1230 if ((dp->i_flags & APPEND) 1231 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1232 error = EPERM; 1233 goto out; 1234 } 1235 /* 1236 * Delete reference to directory before purging 1237 * inode. If we crash in between, the directory 1238 * will be reattached to lost+found, 1239 */ 1240 error = ext2_dirremove(dvp, cnp); 1241 if (error) 1242 goto out; 1243 dp->i_nlink--; 1244 dp->i_flag |= IN_CHANGE; 1245 cache_purge(dvp); 1246 VOP_UNLOCK(dvp, 0); 1247 /* 1248 * Truncate inode. The only stuff left 1249 * in the directory is "." and "..". The 1250 * "." reference is inconsequential since 1251 * we're quashing it. The ".." reference 1252 * has already been adjusted above. We've 1253 * removed the "." reference and the reference 1254 * in the parent directory, but there may be 1255 * other hard links so decrement by 2 and 1256 * worry about them later. 1257 */ 1258 ip->i_nlink -= 2; 1259 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1260 cnp->cn_thread); 1261 cache_purge(ITOV(ip)); 1262 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1263 VOP_UNLOCK(vp, 0); 1264 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1265 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1266 } 1267out: 1268 return (error); 1269} 1270 1271/* 1272 * symlink -- make a symbolic link 1273 */ 1274static int 1275ext2_symlink(struct vop_symlink_args *ap) 1276{ 1277 struct vnode *vp, **vpp = ap->a_vpp; 1278 struct inode *ip; 1279 int len, error; 1280 1281 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1282 vpp, ap->a_cnp); 1283 if (error) 1284 return (error); 1285 vp = *vpp; 1286 len = strlen(ap->a_target); 1287 if (len < vp->v_mount->mnt_maxsymlinklen) { 1288 ip = VTOI(vp); 1289 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1290 ip->i_size = len; 1291 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1292 } else 1293 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1294 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1295 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1296 if (error) 1297 vput(vp); 1298 return (error); 1299} 1300 1301/* 1302 * Return target name of a symbolic link 1303 */ 1304static int 1305ext2_readlink(struct vop_readlink_args *ap) 1306{ 1307 struct vnode *vp = ap->a_vp; 1308 struct inode *ip = VTOI(vp); 1309 int isize; 1310 1311 isize = ip->i_size; 1312 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1313 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1314 return (0); 1315 } 1316 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1317} 1318 1319/* 1320 * Calculate the logical to physical mapping if not done already, 1321 * then call the device strategy routine. 1322 * 1323 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1324 * deadlock on memory. See ext2_bmap() for details. 1325 */ 1326static int 1327ext2_strategy(struct vop_strategy_args *ap) 1328{ 1329 struct buf *bp = ap->a_bp; 1330 struct vnode *vp = ap->a_vp; 1331 struct inode *ip; 1332 struct bufobj *bo; 1333 daddr_t blkno; 1334 int error; 1335 1336 ip = VTOI(vp); 1337 if (vp->v_type == VBLK || vp->v_type == VCHR) 1338 panic("ext2_strategy: spec"); 1339 if (bp->b_blkno == bp->b_lblkno) { 1340 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1341 bp->b_blkno = blkno; 1342 if (error) { 1343 bp->b_error = error; 1344 bp->b_ioflags |= BIO_ERROR; 1345 bufdone(bp); 1346 return (0); 1347 } 1348 if ((long)bp->b_blkno == -1) 1349 vfs_bio_clrbuf(bp); 1350 } 1351 if ((long)bp->b_blkno == -1) { 1352 bufdone(bp); 1353 return (0); 1354 } 1355 bp->b_iooffset = dbtob(bp->b_blkno); 1356 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1357 BO_STRATEGY(bo, bp); 1358 return (0); 1359} 1360 1361/* 1362 * Print out the contents of an inode. 1363 */ 1364static int 1365ext2_print(struct vop_print_args *ap) 1366{ 1367 struct vnode *vp = ap->a_vp; 1368 struct inode *ip = VTOI(vp); 1369 1370 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number); 1371 if (vp->v_type == VFIFO) 1372 fifo_printinfo(vp); 1373 printf("\n"); 1374 return (0); 1375} 1376 1377/* 1378 * Close wrapper for fifos. 1379 * 1380 * Update the times on the inode then do device close. 1381 */ 1382static int 1383ext2fifo_close(struct vop_close_args *ap) 1384{ 1385 struct vnode *vp = ap->a_vp; 1386 1387 VI_LOCK(vp); 1388 if (vp->v_usecount > 1) 1389 ext2_itimes_locked(vp); 1390 VI_UNLOCK(vp); 1391 return (fifo_specops.vop_close(ap)); 1392} 1393 1394/* 1395 * Kqfilter wrapper for fifos. 1396 * 1397 * Fall through to ext2 kqfilter routines if needed 1398 */ 1399static int 1400ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1401{ 1402 int error; 1403 1404 error = fifo_specops.vop_kqfilter(ap); 1405 if (error) 1406 error = vfs_kqfilter(ap); 1407 return (error); 1408} 1409 1410/* 1411 * Return POSIX pathconf information applicable to ext2 filesystems. 1412 */ 1413static int 1414ext2_pathconf(struct vop_pathconf_args *ap) 1415{ 1416 int error = 0; 1417 1418 switch (ap->a_name) { 1419 case _PC_LINK_MAX: 1420 *ap->a_retval = EXT2_LINK_MAX; 1421 break; 1422 case _PC_NAME_MAX: 1423 *ap->a_retval = NAME_MAX; 1424 break; 1425 case _PC_PATH_MAX: 1426 *ap->a_retval = PATH_MAX; 1427 break; 1428 case _PC_PIPE_BUF: 1429 *ap->a_retval = PIPE_BUF; 1430 break; 1431 case _PC_CHOWN_RESTRICTED: 1432 *ap->a_retval = 1; 1433 break; 1434 case _PC_NO_TRUNC: 1435 *ap->a_retval = 1; 1436 break; 1437 case _PC_MIN_HOLE_SIZE: 1438 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1439 break; 1440 case _PC_ASYNC_IO: 1441 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1442 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1443 error = EINVAL; 1444 break; 1445 case _PC_PRIO_IO: 1446 *ap->a_retval = 0; 1447 break; 1448 case _PC_SYNC_IO: 1449 *ap->a_retval = 0; 1450 break; 1451 case _PC_ALLOC_SIZE_MIN: 1452 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1453 break; 1454 case _PC_FILESIZEBITS: 1455 *ap->a_retval = 64; 1456 break; 1457 case _PC_REC_INCR_XFER_SIZE: 1458 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1459 break; 1460 case _PC_REC_MAX_XFER_SIZE: 1461 *ap->a_retval = -1; /* means ``unlimited'' */ 1462 break; 1463 case _PC_REC_MIN_XFER_SIZE: 1464 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1465 break; 1466 case _PC_REC_XFER_ALIGN: 1467 *ap->a_retval = PAGE_SIZE; 1468 break; 1469 case _PC_SYMLINK_MAX: 1470 *ap->a_retval = MAXPATHLEN; 1471 break; 1472 1473 default: 1474 error = EINVAL; 1475 break; 1476 } 1477 return (error); 1478} 1479 1480/* 1481 * Vnode pointer to File handle 1482 */ 1483/* ARGSUSED */ 1484static int 1485ext2_vptofh(struct vop_vptofh_args *ap) 1486{ 1487 struct inode *ip; 1488 struct ufid *ufhp; 1489 1490 ip = VTOI(ap->a_vp); 1491 ufhp = (struct ufid *)ap->a_fhp; 1492 ufhp->ufid_len = sizeof(struct ufid); 1493 ufhp->ufid_ino = ip->i_number; 1494 ufhp->ufid_gen = ip->i_gen; 1495 return (0); 1496} 1497 1498/* 1499 * Initialize the vnode associated with a new inode, handle aliased 1500 * vnodes. 1501 */ 1502int 1503ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1504{ 1505 struct inode *ip; 1506 struct vnode *vp; 1507 1508 vp = *vpp; 1509 ip = VTOI(vp); 1510 vp->v_type = IFTOVT(ip->i_mode); 1511 if (vp->v_type == VFIFO) 1512 vp->v_op = fifoops; 1513 1514 if (ip->i_number == EXT2_ROOTINO) 1515 vp->v_vflag |= VV_ROOT; 1516 ip->i_modrev = init_va_filerev(); 1517 *vpp = vp; 1518 return (0); 1519} 1520 1521/* 1522 * Allocate a new inode. 1523 */ 1524static int 1525ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1526 struct componentname *cnp) 1527{ 1528 struct inode *ip, *pdir; 1529 struct vnode *tvp; 1530 int error; 1531 1532 pdir = VTOI(dvp); 1533#ifdef INVARIANTS 1534 if ((cnp->cn_flags & HASBUF) == 0) 1535 panic("ext2_makeinode: no name"); 1536#endif 1537 *vpp = NULL; 1538 if ((mode & IFMT) == 0) 1539 mode |= IFREG; 1540 1541 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1542 if (error) { 1543 return (error); 1544 } 1545 ip = VTOI(tvp); 1546 ip->i_gid = pdir->i_gid; 1547#ifdef SUIDDIR 1548 { 1549 /* 1550 * if we are 1551 * not the owner of the directory, 1552 * and we are hacking owners here, (only do this where told to) 1553 * and we are not giving it TOO root, (would subvert quotas) 1554 * then go ahead and give it to the other user. 1555 * Note that this drops off the execute bits for security. 1556 */ 1557 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1558 (pdir->i_mode & ISUID) && 1559 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1560 ip->i_uid = pdir->i_uid; 1561 mode &= ~07111; 1562 } else { 1563 ip->i_uid = cnp->cn_cred->cr_uid; 1564 } 1565 } 1566#else 1567 ip->i_uid = cnp->cn_cred->cr_uid; 1568#endif 1569 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1570 ip->i_mode = mode; 1571 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1572 ip->i_nlink = 1; 1573 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1574 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1575 ip->i_mode &= ~ISGID; 1576 } 1577 1578 if (cnp->cn_flags & ISWHITEOUT) 1579 ip->i_flags |= UF_OPAQUE; 1580 1581 /* 1582 * Make sure inode goes to disk before directory entry. 1583 */ 1584 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1585 if (error) 1586 goto bad; 1587 error = ext2_direnter(ip, dvp, cnp); 1588 if (error) 1589 goto bad; 1590 1591 *vpp = tvp; 1592 return (0); 1593 1594bad: 1595 /* 1596 * Write error occurred trying to update the inode 1597 * or the directory so must deallocate the inode. 1598 */ 1599 ip->i_nlink = 0; 1600 ip->i_flag |= IN_CHANGE; 1601 vput(tvp); 1602 return (error); 1603} 1604 1605/* 1606 * Vnode op for reading. 1607 */ 1608static int 1609ext2_read(struct vop_read_args *ap) 1610{ 1611 struct vnode *vp; 1612 struct inode *ip; 1613 int error; 1614 1615 vp = ap->a_vp; 1616 ip = VTOI(vp); 1617 1618 /*EXT4_EXT_LOCK(ip);*/ 1619 if (ip->i_flag & IN_E4EXTENTS) 1620 error = ext4_ext_read(ap); 1621 else 1622 error = ext2_ind_read(ap); 1623 /*EXT4_EXT_UNLOCK(ip);*/ 1624 return (error); 1625} 1626 1627/* 1628 * Vnode op for reading. 1629 */ 1630static int 1631ext2_ind_read(struct vop_read_args *ap) 1632{ 1633 struct vnode *vp; 1634 struct inode *ip; 1635 struct uio *uio; 1636 struct m_ext2fs *fs; 1637 struct buf *bp; 1638 daddr_t lbn, nextlbn; 1639 off_t bytesinfile; 1640 long size, xfersize, blkoffset; 1641 int error, orig_resid, seqcount; 1642 int ioflag; 1643 1644 vp = ap->a_vp; 1645 uio = ap->a_uio; 1646 ioflag = ap->a_ioflag; 1647 1648 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1649 ip = VTOI(vp); 1650 1651#ifdef INVARIANTS 1652 if (uio->uio_rw != UIO_READ) 1653 panic("%s: mode", "ext2_read"); 1654 1655 if (vp->v_type == VLNK) { 1656 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1657 panic("%s: short symlink", "ext2_read"); 1658 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1659 panic("%s: type %d", "ext2_read", vp->v_type); 1660#endif 1661 orig_resid = uio->uio_resid; 1662 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1663 if (orig_resid == 0) 1664 return (0); 1665 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1666 fs = ip->i_e2fs; 1667 if (uio->uio_offset < ip->i_size && 1668 uio->uio_offset >= fs->e2fs_maxfilesize) 1669 return (EOVERFLOW); 1670 1671 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1672 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1673 break; 1674 lbn = lblkno(fs, uio->uio_offset); 1675 nextlbn = lbn + 1; 1676 size = blksize(fs, ip, lbn); 1677 blkoffset = blkoff(fs, uio->uio_offset); 1678 1679 xfersize = fs->e2fs_fsize - blkoffset; 1680 if (uio->uio_resid < xfersize) 1681 xfersize = uio->uio_resid; 1682 if (bytesinfile < xfersize) 1683 xfersize = bytesinfile; 1684 1685 if (lblktosize(fs, nextlbn) >= ip->i_size) 1686 error = bread(vp, lbn, size, NOCRED, &bp); 1687 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 1688 error = cluster_read(vp, ip->i_size, lbn, size, 1689 NOCRED, blkoffset + uio->uio_resid, seqcount, 1690 0, &bp); 1691 } else if (seqcount > 1) { 1692 u_int nextsize = blksize(fs, ip, nextlbn); 1693 error = breadn(vp, lbn, 1694 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1695 } else 1696 error = bread(vp, lbn, size, NOCRED, &bp); 1697 if (error) { 1698 brelse(bp); 1699 bp = NULL; 1700 break; 1701 } 1702 1703 /* 1704 * If IO_DIRECT then set B_DIRECT for the buffer. This 1705 * will cause us to attempt to release the buffer later on 1706 * and will cause the buffer cache to attempt to free the 1707 * underlying pages. 1708 */ 1709 if (ioflag & IO_DIRECT) 1710 bp->b_flags |= B_DIRECT; 1711 1712 /* 1713 * We should only get non-zero b_resid when an I/O error 1714 * has occurred, which should cause us to break above. 1715 * However, if the short read did not cause an error, 1716 * then we want to ensure that we do not uiomove bad 1717 * or uninitialized data. 1718 */ 1719 size -= bp->b_resid; 1720 if (size < xfersize) { 1721 if (size == 0) 1722 break; 1723 xfersize = size; 1724 } 1725 error = uiomove((char *)bp->b_data + blkoffset, 1726 (int)xfersize, uio); 1727 if (error) 1728 break; 1729 1730 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1731 /* 1732 * If it's VMIO or direct I/O, then we don't 1733 * need the buf, mark it available for 1734 * freeing. If it's non-direct VMIO, the VM has 1735 * the data. 1736 */ 1737 bp->b_flags |= B_RELBUF; 1738 brelse(bp); 1739 } else { 1740 /* 1741 * Otherwise let whoever 1742 * made the request take care of 1743 * freeing it. We just queue 1744 * it onto another list. 1745 */ 1746 bqrelse(bp); 1747 } 1748 } 1749 1750 /* 1751 * This can only happen in the case of an error 1752 * because the loop above resets bp to NULL on each iteration 1753 * and on normal completion has not set a new value into it. 1754 * so it must have come from a 'break' statement 1755 */ 1756 if (bp != NULL) { 1757 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1758 bp->b_flags |= B_RELBUF; 1759 brelse(bp); 1760 } else { 1761 bqrelse(bp); 1762 } 1763 } 1764 1765 if ((error == 0 || uio->uio_resid != orig_resid) && 1766 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1767 ip->i_flag |= IN_ACCESS; 1768 return (error); 1769} 1770 1771static int 1772ext2_ioctl(struct vop_ioctl_args *ap) 1773{ 1774 1775 switch (ap->a_command) { 1776 case FIOSEEKDATA: 1777 case FIOSEEKHOLE: 1778 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1779 (off_t *)ap->a_data, ap->a_cred)); 1780 default: 1781 return (ENOTTY); 1782 } 1783} 1784 1785/* 1786 * this function handles ext4 extents block mapping 1787 */ 1788static int 1789ext4_ext_read(struct vop_read_args *ap) 1790{ 1791 struct vnode *vp; 1792 struct inode *ip; 1793 struct uio *uio; 1794 struct m_ext2fs *fs; 1795 struct buf *bp; 1796 struct ext4_extent nex, *ep; 1797 struct ext4_extent_path path; 1798 daddr_t lbn, newblk; 1799 off_t bytesinfile; 1800 int cache_type; 1801 ssize_t orig_resid; 1802 int error; 1803 long size, xfersize, blkoffset; 1804 1805 vp = ap->a_vp; 1806 ip = VTOI(vp); 1807 uio = ap->a_uio; 1808 memset(&path, 0, sizeof(path)); 1809 1810 orig_resid = uio->uio_resid; 1811 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1812 if (orig_resid == 0) 1813 return (0); 1814 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1815 fs = ip->i_e2fs; 1816 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1817 return (EOVERFLOW); 1818 1819 while (uio->uio_resid > 0) { 1820 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1821 break; 1822 lbn = lblkno(fs, uio->uio_offset); 1823 size = blksize(fs, ip, lbn); 1824 blkoffset = blkoff(fs, uio->uio_offset); 1825 1826 xfersize = fs->e2fs_fsize - blkoffset; 1827 xfersize = MIN(xfersize, uio->uio_resid); 1828 xfersize = MIN(xfersize, bytesinfile); 1829 1830 /* get block from ext4 extent cache */ 1831 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1832 switch (cache_type) { 1833 case EXT4_EXT_CACHE_NO: 1834 ext4_ext_find_extent(fs, ip, lbn, &path); 1835 ep = path.ep_ext; 1836 if (ep == NULL) 1837 return (EIO); 1838 1839 ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN); 1840 1841 newblk = lbn - ep->e_blk + (ep->e_start_lo | 1842 (daddr_t)ep->e_start_hi << 32); 1843 1844 if (path.ep_bp != NULL) { 1845 brelse(path.ep_bp); 1846 path.ep_bp = NULL; 1847 } 1848 break; 1849 1850 case EXT4_EXT_CACHE_GAP: 1851 /* block has not been allocated yet */ 1852 return (0); 1853 1854 case EXT4_EXT_CACHE_IN: 1855 newblk = lbn - nex.e_blk + (nex.e_start_lo | 1856 (daddr_t)nex.e_start_hi << 32); 1857 break; 1858 1859 default: 1860 panic("%s: invalid cache type", __func__); 1861 } 1862 1863 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp); 1864 if (error) { 1865 brelse(bp); 1866 return (error); 1867 } 1868 1869 size -= bp->b_resid; 1870 if (size < xfersize) { 1871 if (size == 0) { 1872 bqrelse(bp); 1873 break; 1874 } 1875 xfersize = size; 1876 } 1877 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio); 1878 bqrelse(bp); 1879 if (error) 1880 return (error); 1881 } 1882 1883 return (0); 1884} 1885 1886/* 1887 * Vnode op for writing. 1888 */ 1889static int 1890ext2_write(struct vop_write_args *ap) 1891{ 1892 struct vnode *vp; 1893 struct uio *uio; 1894 struct inode *ip; 1895 struct m_ext2fs *fs; 1896 struct buf *bp; 1897 daddr_t lbn; 1898 off_t osize; 1899 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 1900 1901 ioflag = ap->a_ioflag; 1902 uio = ap->a_uio; 1903 vp = ap->a_vp; 1904 1905 seqcount = ioflag >> IO_SEQSHIFT; 1906 ip = VTOI(vp); 1907 1908#ifdef INVARIANTS 1909 if (uio->uio_rw != UIO_WRITE) 1910 panic("%s: mode", "ext2_write"); 1911#endif 1912 1913 switch (vp->v_type) { 1914 case VREG: 1915 if (ioflag & IO_APPEND) 1916 uio->uio_offset = ip->i_size; 1917 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 1918 return (EPERM); 1919 /* FALLTHROUGH */ 1920 case VLNK: 1921 break; 1922 case VDIR: 1923 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 1924 if ((ioflag & IO_SYNC) == 0) 1925 panic("ext2_write: nonsync dir write"); 1926 break; 1927 default: 1928 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 1929 vp->v_type, (intmax_t)uio->uio_offset, 1930 (intmax_t)uio->uio_resid); 1931 } 1932 1933 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 1934 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 1935 fs = ip->i_e2fs; 1936 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 1937 return (EFBIG); 1938 /* 1939 * Maybe this should be above the vnode op call, but so long as 1940 * file servers have no limits, I don't think it matters. 1941 */ 1942 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 1943 return (EFBIG); 1944 1945 resid = uio->uio_resid; 1946 osize = ip->i_size; 1947 if (seqcount > BA_SEQMAX) 1948 flags = BA_SEQMAX << BA_SEQSHIFT; 1949 else 1950 flags = seqcount << BA_SEQSHIFT; 1951 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1952 flags |= IO_SYNC; 1953 1954 for (error = 0; uio->uio_resid > 0;) { 1955 lbn = lblkno(fs, uio->uio_offset); 1956 blkoffset = blkoff(fs, uio->uio_offset); 1957 xfersize = fs->e2fs_fsize - blkoffset; 1958 if (uio->uio_resid < xfersize) 1959 xfersize = uio->uio_resid; 1960 if (uio->uio_offset + xfersize > ip->i_size) 1961 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 1962 1963 /* 1964 * We must perform a read-before-write if the transfer size 1965 * does not cover the entire buffer. 1966 */ 1967 if (fs->e2fs_bsize > xfersize) 1968 flags |= BA_CLRBUF; 1969 else 1970 flags &= ~BA_CLRBUF; 1971 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 1972 ap->a_cred, &bp, flags); 1973 if (error != 0) 1974 break; 1975 1976 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 1977 bp->b_flags |= B_NOCACHE; 1978 if (uio->uio_offset + xfersize > ip->i_size) 1979 ip->i_size = uio->uio_offset + xfersize; 1980 size = blksize(fs, ip, lbn) - bp->b_resid; 1981 if (size < xfersize) 1982 xfersize = size; 1983 1984 error = 1985 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1986 /* 1987 * If the buffer is not already filled and we encounter an 1988 * error while trying to fill it, we have to clear out any 1989 * garbage data from the pages instantiated for the buffer. 1990 * If we do not, a failed uiomove() during a write can leave 1991 * the prior contents of the pages exposed to a userland mmap. 1992 * 1993 * Note that we need only clear buffers with a transfer size 1994 * equal to the block size because buffers with a shorter 1995 * transfer size were cleared above by the call to ext2_balloc() 1996 * with the BA_CLRBUF flag set. 1997 * 1998 * If the source region for uiomove identically mmaps the 1999 * buffer, uiomove() performed the NOP copy, and the buffer 2000 * content remains valid because the page fault handler 2001 * validated the pages. 2002 */ 2003 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2004 fs->e2fs_bsize == xfersize) 2005 vfs_bio_clrbuf(bp); 2006 if (ioflag & (IO_VMIO|IO_DIRECT)) { 2007 bp->b_flags |= B_RELBUF; 2008 } 2009 2010 /* 2011 * If IO_SYNC each buffer is written synchronously. Otherwise 2012 * if we have a severe page deficiency write the buffer 2013 * asynchronously. Otherwise try to cluster, and if that 2014 * doesn't do it then either do an async write (if O_DIRECT), 2015 * or a delayed write (if not). 2016 */ 2017 if (ioflag & IO_SYNC) { 2018 (void)bwrite(bp); 2019 } else if (vm_page_count_severe() || 2020 buf_dirty_count_severe() || 2021 (ioflag & IO_ASYNC)) { 2022 bp->b_flags |= B_CLUSTEROK; 2023 bawrite(bp); 2024 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2025 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2026 bp->b_flags |= B_CLUSTEROK; 2027 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2028 } else { 2029 bawrite(bp); 2030 } 2031 } else if (ioflag & IO_DIRECT) { 2032 bp->b_flags |= B_CLUSTEROK; 2033 bawrite(bp); 2034 } else { 2035 bp->b_flags |= B_CLUSTEROK; 2036 bdwrite(bp); 2037 } 2038 if (error || xfersize == 0) 2039 break; 2040 } 2041 /* 2042 * If we successfully wrote any data, and we are not the superuser 2043 * we clear the setuid and setgid bits as a precaution against 2044 * tampering. 2045 */ 2046 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2047 ap->a_cred) { 2048 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2049 ip->i_mode &= ~(ISUID | ISGID); 2050 } 2051 if (error) { 2052 if (ioflag & IO_UNIT) { 2053 (void)ext2_truncate(vp, osize, 2054 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2055 uio->uio_offset -= resid - uio->uio_resid; 2056 uio->uio_resid = resid; 2057 } 2058 } 2059 if (uio->uio_resid != resid) { 2060 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2061 if (ioflag & IO_SYNC) 2062 error = ext2_update(vp, 1); 2063 } 2064 return (error); 2065} 2066 2067/* 2068 * get page routine 2069 */ 2070static int 2071ext2_getpages(struct vop_getpages_args *ap) 2072{ 2073 int i; 2074 vm_page_t mreq; 2075 int pcount; 2076 2077 pcount = round_page(ap->a_count) / PAGE_SIZE; 2078 mreq = ap->a_m[ap->a_reqpage]; 2079 2080 /* 2081 * if ANY DEV_BSIZE blocks are valid on a large filesystem block, 2082 * then the entire page is valid. Since the page may be mapped, 2083 * user programs might reference data beyond the actual end of file 2084 * occuring within the page. We have to zero that data. 2085 */ 2086 VM_OBJECT_WLOCK(mreq->object); 2087 if (mreq->valid) { 2088 if (mreq->valid != VM_PAGE_BITS_ALL) 2089 vm_page_zero_invalid(mreq, TRUE); 2090 for (i = 0; i < pcount; i++) { 2091 if (i != ap->a_reqpage) { 2092 vm_page_lock(ap->a_m[i]); 2093 vm_page_free(ap->a_m[i]); 2094 vm_page_unlock(ap->a_m[i]); 2095 } 2096 } 2097 VM_OBJECT_WUNLOCK(mreq->object); 2098 return VM_PAGER_OK; 2099 } 2100 VM_OBJECT_WUNLOCK(mreq->object); 2101 2102 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 2103 ap->a_count, 2104 ap->a_reqpage); 2105} 2106