ext2_vnops.c revision 295714
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 295714 2016-02-17 19:09:06Z 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 != 0) 244 return (error); 245 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0) 246 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp); 247 return (0); 248} 249 250static int 251ext2_open(struct vop_open_args *ap) 252{ 253 254 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) 255 return (EOPNOTSUPP); 256 257 /* 258 * Files marked append-only must be opened for appending. 259 */ 260 if ((VTOI(ap->a_vp)->i_flags & APPEND) && 261 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) 262 return (EPERM); 263 264 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); 265 266 return (0); 267} 268 269/* 270 * Close called. 271 * 272 * Update the times on the inode. 273 */ 274static int 275ext2_close(struct vop_close_args *ap) 276{ 277 struct vnode *vp = ap->a_vp; 278 279 VI_LOCK(vp); 280 if (vp->v_usecount > 1) 281 ext2_itimes_locked(vp); 282 VI_UNLOCK(vp); 283 return (0); 284} 285 286static int 287ext2_access(struct vop_access_args *ap) 288{ 289 struct vnode *vp = ap->a_vp; 290 struct inode *ip = VTOI(vp); 291 accmode_t accmode = ap->a_accmode; 292 int error; 293 294 if (vp->v_type == VBLK || vp->v_type == VCHR) 295 return (EOPNOTSUPP); 296 297 /* 298 * Disallow write attempts on read-only file systems; 299 * unless the file is a socket, fifo, or a block or 300 * character device resident on the file system. 301 */ 302 if (accmode & VWRITE) { 303 switch (vp->v_type) { 304 case VDIR: 305 case VLNK: 306 case VREG: 307 if (vp->v_mount->mnt_flag & MNT_RDONLY) 308 return (EROFS); 309 break; 310 default: 311 break; 312 } 313 } 314 315 /* If immutable bit set, nobody gets to write it. */ 316 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT))) 317 return (EPERM); 318 319 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, 320 ap->a_accmode, ap->a_cred, NULL); 321 return (error); 322} 323 324static int 325ext2_getattr(struct vop_getattr_args *ap) 326{ 327 struct vnode *vp = ap->a_vp; 328 struct inode *ip = VTOI(vp); 329 struct vattr *vap = ap->a_vap; 330 331 ext2_itimes(vp); 332 /* 333 * Copy from inode table 334 */ 335 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev); 336 vap->va_fileid = ip->i_number; 337 vap->va_mode = ip->i_mode & ~IFMT; 338 vap->va_nlink = ip->i_nlink; 339 vap->va_uid = ip->i_uid; 340 vap->va_gid = ip->i_gid; 341 vap->va_rdev = ip->i_rdev; 342 vap->va_size = ip->i_size; 343 vap->va_atime.tv_sec = ip->i_atime; 344 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0; 345 vap->va_mtime.tv_sec = ip->i_mtime; 346 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0; 347 vap->va_ctime.tv_sec = ip->i_ctime; 348 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0; 349 if E2DI_HAS_XTIME(ip) { 350 vap->va_birthtime.tv_sec = ip->i_birthtime; 351 vap->va_birthtime.tv_nsec = ip->i_birthnsec; 352 } 353 vap->va_flags = ip->i_flags; 354 vap->va_gen = ip->i_gen; 355 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; 356 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); 357 vap->va_type = IFTOVT(ip->i_mode); 358 vap->va_filerev = ip->i_modrev; 359 return (0); 360} 361 362/* 363 * Set attribute vnode op. called from several syscalls 364 */ 365static int 366ext2_setattr(struct vop_setattr_args *ap) 367{ 368 struct vattr *vap = ap->a_vap; 369 struct vnode *vp = ap->a_vp; 370 struct inode *ip = VTOI(vp); 371 struct ucred *cred = ap->a_cred; 372 struct thread *td = curthread; 373 int error; 374 375 /* 376 * Check for unsettable attributes. 377 */ 378 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 379 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 380 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 381 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 382 return (EINVAL); 383 } 384 if (vap->va_flags != VNOVAL) { 385 /* Disallow flags not supported by ext2fs. */ 386 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP)) 387 return (EOPNOTSUPP); 388 389 if (vp->v_mount->mnt_flag & MNT_RDONLY) 390 return (EROFS); 391 /* 392 * Callers may only modify the file flags on objects they 393 * have VADMIN rights for. 394 */ 395 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 396 return (error); 397 /* 398 * Unprivileged processes and privileged processes in 399 * jail() are not permitted to unset system flags, or 400 * modify flags if any system flags are set. 401 * Privileged non-jail processes may not modify system flags 402 * if securelevel > 0 and any existing system flags are set. 403 */ 404 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) { 405 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) { 406 error = securelevel_gt(cred, 0); 407 if (error) 408 return (error); 409 } 410 } else { 411 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) || 412 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE)) 413 return (EPERM); 414 } 415 ip->i_flags = vap->va_flags; 416 ip->i_flag |= IN_CHANGE; 417 if (ip->i_flags & (IMMUTABLE | APPEND)) 418 return (0); 419 } 420 if (ip->i_flags & (IMMUTABLE | APPEND)) 421 return (EPERM); 422 /* 423 * Go through the fields and update iff not VNOVAL. 424 */ 425 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 426 if (vp->v_mount->mnt_flag & MNT_RDONLY) 427 return (EROFS); 428 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred, 429 td)) != 0) 430 return (error); 431 } 432 if (vap->va_size != VNOVAL) { 433 /* 434 * Disallow write attempts on read-only file systems; 435 * unless the file is a socket, fifo, or a block or 436 * character device resident on the file system. 437 */ 438 switch (vp->v_type) { 439 case VDIR: 440 return (EISDIR); 441 case VLNK: 442 case VREG: 443 if (vp->v_mount->mnt_flag & MNT_RDONLY) 444 return (EROFS); 445 break; 446 default: 447 break; 448 } 449 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0) 450 return (error); 451 } 452 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 453 if (vp->v_mount->mnt_flag & MNT_RDONLY) 454 return (EROFS); 455 /* 456 * From utimes(2): 457 * If times is NULL, ... The caller must be the owner of 458 * the file, have permission to write the file, or be the 459 * super-user. 460 * If times is non-NULL, ... The caller must be the owner of 461 * the file or be the super-user. 462 */ 463 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) && 464 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 465 (error = VOP_ACCESS(vp, VWRITE, cred, td)))) 466 return (error); 467 if (vap->va_atime.tv_sec != VNOVAL) 468 ip->i_flag |= IN_ACCESS; 469 if (vap->va_mtime.tv_sec != VNOVAL) 470 ip->i_flag |= IN_CHANGE | IN_UPDATE; 471 ext2_itimes(vp); 472 if (vap->va_atime.tv_sec != VNOVAL) { 473 ip->i_atime = vap->va_atime.tv_sec; 474 ip->i_atimensec = vap->va_atime.tv_nsec; 475 } 476 if (vap->va_mtime.tv_sec != VNOVAL) { 477 ip->i_mtime = vap->va_mtime.tv_sec; 478 ip->i_mtimensec = vap->va_mtime.tv_nsec; 479 } 480 ip->i_birthtime = vap->va_birthtime.tv_sec; 481 ip->i_birthnsec = vap->va_birthtime.tv_nsec; 482 error = ext2_update(vp, 0); 483 if (error) 484 return (error); 485 } 486 error = 0; 487 if (vap->va_mode != (mode_t)VNOVAL) { 488 if (vp->v_mount->mnt_flag & MNT_RDONLY) 489 return (EROFS); 490 error = ext2_chmod(vp, (int)vap->va_mode, cred, td); 491 } 492 return (error); 493} 494 495/* 496 * Change the mode on a file. 497 * Inode must be locked before calling. 498 */ 499static int 500ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td) 501{ 502 struct inode *ip = VTOI(vp); 503 int error; 504 505 /* 506 * To modify the permissions on a file, must possess VADMIN 507 * for that file. 508 */ 509 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 510 return (error); 511 /* 512 * Privileged processes may set the sticky bit on non-directories, 513 * as well as set the setgid bit on a file with a group that the 514 * process is not a member of. 515 */ 516 if (vp->v_type != VDIR && (mode & S_ISTXT)) { 517 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0); 518 if (error) 519 return (EFTYPE); 520 } 521 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) { 522 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0); 523 if (error) 524 return (error); 525 } 526 ip->i_mode &= ~ALLPERMS; 527 ip->i_mode |= (mode & ALLPERMS); 528 ip->i_flag |= IN_CHANGE; 529 return (0); 530} 531 532/* 533 * Perform chown operation on inode ip; 534 * inode must be locked prior to call. 535 */ 536static int 537ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 538 struct thread *td) 539{ 540 struct inode *ip = VTOI(vp); 541 uid_t ouid; 542 gid_t ogid; 543 int error = 0; 544 545 if (uid == (uid_t)VNOVAL) 546 uid = ip->i_uid; 547 if (gid == (gid_t)VNOVAL) 548 gid = ip->i_gid; 549 /* 550 * To modify the ownership of a file, must possess VADMIN 551 * for that file. 552 */ 553 if ((error = VOP_ACCESS(vp, VADMIN, cred, td))) 554 return (error); 555 /* 556 * To change the owner of a file, or change the group of a file 557 * to a group of which we are not a member, the caller must 558 * have privilege. 559 */ 560 if (uid != ip->i_uid || (gid != ip->i_gid && 561 !groupmember(gid, cred))) { 562 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0); 563 if (error) 564 return (error); 565 } 566 ogid = ip->i_gid; 567 ouid = ip->i_uid; 568 ip->i_gid = gid; 569 ip->i_uid = uid; 570 ip->i_flag |= IN_CHANGE; 571 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) { 572 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0) 573 ip->i_mode &= ~(ISUID | ISGID); 574 } 575 return (0); 576} 577 578/* 579 * Synch an open file. 580 */ 581/* ARGSUSED */ 582static int 583ext2_fsync(struct vop_fsync_args *ap) 584{ 585 /* 586 * Flush all dirty buffers associated with a vnode. 587 */ 588 589 vop_stdfsync(ap); 590 591 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT)); 592} 593 594/* 595 * Mknod vnode call 596 */ 597/* ARGSUSED */ 598static int 599ext2_mknod(struct vop_mknod_args *ap) 600{ 601 struct vattr *vap = ap->a_vap; 602 struct vnode **vpp = ap->a_vpp; 603 struct inode *ip; 604 ino_t ino; 605 int error; 606 607 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), 608 ap->a_dvp, vpp, ap->a_cnp); 609 if (error) 610 return (error); 611 ip = VTOI(*vpp); 612 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 613 if (vap->va_rdev != VNOVAL) { 614 /* 615 * Want to be able to use this to make badblock 616 * inodes, so don't truncate the dev number. 617 */ 618 ip->i_rdev = vap->va_rdev; 619 } 620 /* 621 * Remove inode, then reload it through VFS_VGET so it is 622 * checked to see if it is an alias of an existing entry in 623 * the inode cache. XXX I don't believe this is necessary now. 624 */ 625 (*vpp)->v_type = VNON; 626 ino = ip->i_number; /* Save this before vgone() invalidates ip. */ 627 vgone(*vpp); 628 vput(*vpp); 629 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp); 630 if (error) { 631 *vpp = NULL; 632 return (error); 633 } 634 return (0); 635} 636 637static int 638ext2_remove(struct vop_remove_args *ap) 639{ 640 struct inode *ip; 641 struct vnode *vp = ap->a_vp; 642 struct vnode *dvp = ap->a_dvp; 643 int error; 644 645 ip = VTOI(vp); 646 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 647 (VTOI(dvp)->i_flags & APPEND)) { 648 error = EPERM; 649 goto out; 650 } 651 error = ext2_dirremove(dvp, ap->a_cnp); 652 if (error == 0) { 653 ip->i_nlink--; 654 ip->i_flag |= IN_CHANGE; 655 } 656out: 657 return (error); 658} 659 660/* 661 * link vnode call 662 */ 663static int 664ext2_link(struct vop_link_args *ap) 665{ 666 struct vnode *vp = ap->a_vp; 667 struct vnode *tdvp = ap->a_tdvp; 668 struct componentname *cnp = ap->a_cnp; 669 struct inode *ip; 670 int error; 671 672#ifdef INVARIANTS 673 if ((cnp->cn_flags & HASBUF) == 0) 674 panic("ext2_link: no name"); 675#endif 676 ip = VTOI(vp); 677 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) { 678 error = EMLINK; 679 goto out; 680 } 681 if (ip->i_flags & (IMMUTABLE | APPEND)) { 682 error = EPERM; 683 goto out; 684 } 685 ip->i_nlink++; 686 ip->i_flag |= IN_CHANGE; 687 error = ext2_update(vp, !DOINGASYNC(vp)); 688 if (!error) 689 error = ext2_direnter(ip, tdvp, cnp); 690 if (error) { 691 ip->i_nlink--; 692 ip->i_flag |= IN_CHANGE; 693 } 694out: 695 return (error); 696} 697 698/* 699 * Rename system call. 700 * rename("foo", "bar"); 701 * is essentially 702 * unlink("bar"); 703 * link("foo", "bar"); 704 * unlink("foo"); 705 * but ``atomically''. Can't do full commit without saving state in the 706 * inode on disk which isn't feasible at this time. Best we can do is 707 * always guarantee the target exists. 708 * 709 * Basic algorithm is: 710 * 711 * 1) Bump link count on source while we're linking it to the 712 * target. This also ensure the inode won't be deleted out 713 * from underneath us while we work (it may be truncated by 714 * a concurrent `trunc' or `open' for creation). 715 * 2) Link source to destination. If destination already exists, 716 * delete it first. 717 * 3) Unlink source reference to inode if still around. If a 718 * directory was moved and the parent of the destination 719 * is different from the source, patch the ".." entry in the 720 * directory. 721 */ 722static int 723ext2_rename(struct vop_rename_args *ap) 724{ 725 struct vnode *tvp = ap->a_tvp; 726 struct vnode *tdvp = ap->a_tdvp; 727 struct vnode *fvp = ap->a_fvp; 728 struct vnode *fdvp = ap->a_fdvp; 729 struct componentname *tcnp = ap->a_tcnp; 730 struct componentname *fcnp = ap->a_fcnp; 731 struct inode *ip, *xp, *dp; 732 struct dirtemplate dirbuf; 733 int doingdirectory = 0, oldparent = 0, newparent = 0; 734 int error = 0; 735 u_char namlen; 736 737#ifdef INVARIANTS 738 if ((tcnp->cn_flags & HASBUF) == 0 || 739 (fcnp->cn_flags & HASBUF) == 0) 740 panic("ext2_rename: no name"); 741#endif 742 /* 743 * Check for cross-device rename. 744 */ 745 if ((fvp->v_mount != tdvp->v_mount) || 746 (tvp && (fvp->v_mount != tvp->v_mount))) { 747 error = EXDEV; 748abortit: 749 if (tdvp == tvp) 750 vrele(tdvp); 751 else 752 vput(tdvp); 753 if (tvp) 754 vput(tvp); 755 vrele(fdvp); 756 vrele(fvp); 757 return (error); 758 } 759 760 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 761 (VTOI(tdvp)->i_flags & APPEND))) { 762 error = EPERM; 763 goto abortit; 764 } 765 766 /* 767 * Renaming a file to itself has no effect. The upper layers should 768 * not call us in that case. Temporarily just warn if they do. 769 */ 770 if (fvp == tvp) { 771 printf("ext2_rename: fvp == tvp (can't happen)\n"); 772 error = 0; 773 goto abortit; 774 } 775 776 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 777 goto abortit; 778 dp = VTOI(fdvp); 779 ip = VTOI(fvp); 780 if (ip->i_nlink >= EXT2_LINK_MAX) { 781 VOP_UNLOCK(fvp, 0); 782 error = EMLINK; 783 goto abortit; 784 } 785 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) 786 || (dp->i_flags & APPEND)) { 787 VOP_UNLOCK(fvp, 0); 788 error = EPERM; 789 goto abortit; 790 } 791 if ((ip->i_mode & IFMT) == IFDIR) { 792 /* 793 * Avoid ".", "..", and aliases of "." for obvious reasons. 794 */ 795 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || 796 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT || 797 (ip->i_flag & IN_RENAME)) { 798 VOP_UNLOCK(fvp, 0); 799 error = EINVAL; 800 goto abortit; 801 } 802 ip->i_flag |= IN_RENAME; 803 oldparent = dp->i_number; 804 doingdirectory++; 805 } 806 vrele(fdvp); 807 808 /* 809 * When the target exists, both the directory 810 * and target vnodes are returned locked. 811 */ 812 dp = VTOI(tdvp); 813 xp = NULL; 814 if (tvp) 815 xp = VTOI(tvp); 816 817 /* 818 * 1) Bump link count while we're moving stuff 819 * around. If we crash somewhere before 820 * completing our work, the link count 821 * may be wrong, but correctable. 822 */ 823 ip->i_nlink++; 824 ip->i_flag |= IN_CHANGE; 825 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) { 826 VOP_UNLOCK(fvp, 0); 827 goto bad; 828 } 829 830 /* 831 * If ".." must be changed (ie the directory gets a new 832 * parent) then the source directory must not be in the 833 * directory hierarchy above the target, as this would 834 * orphan everything below the source directory. Also 835 * the user must have write permission in the source so 836 * as to be able to change "..". We must repeat the call 837 * to namei, as the parent directory is unlocked by the 838 * call to checkpath(). 839 */ 840 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread); 841 VOP_UNLOCK(fvp, 0); 842 if (oldparent != dp->i_number) 843 newparent = dp->i_number; 844 if (doingdirectory && newparent) { 845 if (error) /* write access check above */ 846 goto bad; 847 if (xp != NULL) 848 vput(tvp); 849 error = ext2_checkpath(ip, dp, tcnp->cn_cred); 850 if (error) 851 goto out; 852 VREF(tdvp); 853 error = relookup(tdvp, &tvp, tcnp); 854 if (error) 855 goto out; 856 vrele(tdvp); 857 dp = VTOI(tdvp); 858 xp = NULL; 859 if (tvp) 860 xp = VTOI(tvp); 861 } 862 /* 863 * 2) If target doesn't exist, link the target 864 * to the source and unlink the source. 865 * Otherwise, rewrite the target directory 866 * entry to reference the source inode and 867 * expunge the original entry's existence. 868 */ 869 if (xp == NULL) { 870 if (dp->i_devvp != ip->i_devvp) 871 panic("ext2_rename: EXDEV"); 872 /* 873 * Account for ".." in new directory. 874 * When source and destination have the same 875 * parent we don't fool with the link count. 876 */ 877 if (doingdirectory && newparent) { 878 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 879 error = EMLINK; 880 goto bad; 881 } 882 dp->i_nlink++; 883 dp->i_flag |= IN_CHANGE; 884 error = ext2_update(tdvp, !DOINGASYNC(tdvp)); 885 if (error) 886 goto bad; 887 } 888 error = ext2_direnter(ip, tdvp, tcnp); 889 if (error) { 890 if (doingdirectory && newparent) { 891 dp->i_nlink--; 892 dp->i_flag |= IN_CHANGE; 893 (void)ext2_update(tdvp, 1); 894 } 895 goto bad; 896 } 897 vput(tdvp); 898 } else { 899 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp) 900 panic("ext2_rename: EXDEV"); 901 /* 902 * Short circuit rename(foo, foo). 903 */ 904 if (xp->i_number == ip->i_number) 905 panic("ext2_rename: same file"); 906 /* 907 * If the parent directory is "sticky", then the user must 908 * own the parent directory, or the destination of the rename, 909 * otherwise the destination may not be changed (except by 910 * root). This implements append-only directories. 911 */ 912 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 && 913 tcnp->cn_cred->cr_uid != dp->i_uid && 914 xp->i_uid != tcnp->cn_cred->cr_uid) { 915 error = EPERM; 916 goto bad; 917 } 918 /* 919 * Target must be empty if a directory and have no links 920 * to it. Also, ensure source and target are compatible 921 * (both directories, or both not directories). 922 */ 923 if ((xp->i_mode&IFMT) == IFDIR) { 924 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 925 xp->i_nlink > 2) { 926 error = ENOTEMPTY; 927 goto bad; 928 } 929 if (!doingdirectory) { 930 error = ENOTDIR; 931 goto bad; 932 } 933 cache_purge(tdvp); 934 } else if (doingdirectory) { 935 error = EISDIR; 936 goto bad; 937 } 938 error = ext2_dirrewrite(dp, ip, tcnp); 939 if (error) 940 goto bad; 941 /* 942 * If the target directory is in the same 943 * directory as the source directory, 944 * decrement the link count on the parent 945 * of the target directory. 946 */ 947 if (doingdirectory && !newparent) { 948 dp->i_nlink--; 949 dp->i_flag |= IN_CHANGE; 950 } 951 vput(tdvp); 952 /* 953 * Adjust the link count of the target to 954 * reflect the dirrewrite above. If this is 955 * a directory it is empty and there are 956 * no links to it, so we can squash the inode and 957 * any space associated with it. We disallowed 958 * renaming over top of a directory with links to 959 * it above, as the remaining link would point to 960 * a directory without "." or ".." entries. 961 */ 962 xp->i_nlink--; 963 if (doingdirectory) { 964 if (--xp->i_nlink != 0) 965 panic("ext2_rename: linked directory"); 966 error = ext2_truncate(tvp, (off_t)0, IO_SYNC, 967 tcnp->cn_cred, tcnp->cn_thread); 968 } 969 xp->i_flag |= IN_CHANGE; 970 vput(tvp); 971 xp = NULL; 972 } 973 974 /* 975 * 3) Unlink the source. 976 */ 977 fcnp->cn_flags &= ~MODMASK; 978 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 979 VREF(fdvp); 980 error = relookup(fdvp, &fvp, fcnp); 981 if (error == 0) 982 vrele(fdvp); 983 if (fvp != NULL) { 984 xp = VTOI(fvp); 985 dp = VTOI(fdvp); 986 } else { 987 /* 988 * From name has disappeared. IN_RENAME is not sufficient 989 * to protect against directory races due to timing windows, 990 * so we can't panic here. 991 */ 992 vrele(ap->a_fvp); 993 return (0); 994 } 995 /* 996 * Ensure that the directory entry still exists and has not 997 * changed while the new name has been entered. If the source is 998 * a file then the entry may have been unlinked or renamed. In 999 * either case there is no further work to be done. If the source 1000 * is a directory then it cannot have been rmdir'ed; its link 1001 * count of three would cause a rmdir to fail with ENOTEMPTY. 1002 * The IN_RENAME flag ensures that it cannot be moved by another 1003 * rename. 1004 */ 1005 if (xp != ip) { 1006 /* 1007 * From name resolves to a different inode. IN_RENAME is 1008 * not sufficient protection against timing window races 1009 * so we can't panic here. 1010 */ 1011 } else { 1012 /* 1013 * If the source is a directory with a 1014 * new parent, the link count of the old 1015 * parent directory must be decremented 1016 * and ".." set to point to the new parent. 1017 */ 1018 if (doingdirectory && newparent) { 1019 dp->i_nlink--; 1020 dp->i_flag |= IN_CHANGE; 1021 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf, 1022 sizeof(struct dirtemplate), (off_t)0, 1023 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1024 tcnp->cn_cred, NOCRED, NULL, NULL); 1025 if (error == 0) { 1026 /* Like ufs little-endian: */ 1027 namlen = dirbuf.dotdot_type; 1028 if (namlen != 2 || 1029 dirbuf.dotdot_name[0] != '.' || 1030 dirbuf.dotdot_name[1] != '.') { 1031 ext2_dirbad(xp, (doff_t)12, 1032 "rename: mangled dir"); 1033 } else { 1034 dirbuf.dotdot_ino = newparent; 1035 (void) vn_rdwr(UIO_WRITE, fvp, 1036 (caddr_t)&dirbuf, 1037 sizeof(struct dirtemplate), 1038 (off_t)0, UIO_SYSSPACE, 1039 IO_NODELOCKED | IO_SYNC | 1040 IO_NOMACCHECK, tcnp->cn_cred, 1041 NOCRED, NULL, NULL); 1042 cache_purge(fdvp); 1043 } 1044 } 1045 } 1046 error = ext2_dirremove(fdvp, fcnp); 1047 if (!error) { 1048 xp->i_nlink--; 1049 xp->i_flag |= IN_CHANGE; 1050 } 1051 xp->i_flag &= ~IN_RENAME; 1052 } 1053 if (dp) 1054 vput(fdvp); 1055 if (xp) 1056 vput(fvp); 1057 vrele(ap->a_fvp); 1058 return (error); 1059 1060bad: 1061 if (xp) 1062 vput(ITOV(xp)); 1063 vput(ITOV(dp)); 1064out: 1065 if (doingdirectory) 1066 ip->i_flag &= ~IN_RENAME; 1067 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) { 1068 ip->i_nlink--; 1069 ip->i_flag |= IN_CHANGE; 1070 ip->i_flag &= ~IN_RENAME; 1071 vput(fvp); 1072 } else 1073 vrele(fvp); 1074 return (error); 1075} 1076 1077/* 1078 * Mkdir system call 1079 */ 1080static int 1081ext2_mkdir(struct vop_mkdir_args *ap) 1082{ 1083 struct vnode *dvp = ap->a_dvp; 1084 struct vattr *vap = ap->a_vap; 1085 struct componentname *cnp = ap->a_cnp; 1086 struct inode *ip, *dp; 1087 struct vnode *tvp; 1088 struct dirtemplate dirtemplate, *dtp; 1089 int error, dmode; 1090 1091#ifdef INVARIANTS 1092 if ((cnp->cn_flags & HASBUF) == 0) 1093 panic("ext2_mkdir: no name"); 1094#endif 1095 dp = VTOI(dvp); 1096 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) { 1097 error = EMLINK; 1098 goto out; 1099 } 1100 dmode = vap->va_mode & 0777; 1101 dmode |= IFDIR; 1102 /* 1103 * Must simulate part of ext2_makeinode here to acquire the inode, 1104 * but not have it entered in the parent directory. The entry is 1105 * made later after writing "." and ".." entries. 1106 */ 1107 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp); 1108 if (error) 1109 goto out; 1110 ip = VTOI(tvp); 1111 ip->i_gid = dp->i_gid; 1112#ifdef SUIDDIR 1113 { 1114 /* 1115 * if we are hacking owners here, (only do this where told to) 1116 * and we are not giving it TOO root, (would subvert quotas) 1117 * then go ahead and give it to the other user. 1118 * The new directory also inherits the SUID bit. 1119 * If user's UID and dir UID are the same, 1120 * 'give it away' so that the SUID is still forced on. 1121 */ 1122 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1123 (dp->i_mode & ISUID) && dp->i_uid) { 1124 dmode |= ISUID; 1125 ip->i_uid = dp->i_uid; 1126 } else { 1127 ip->i_uid = cnp->cn_cred->cr_uid; 1128 } 1129 } 1130#else 1131 ip->i_uid = cnp->cn_cred->cr_uid; 1132#endif 1133 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1134 ip->i_mode = dmode; 1135 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */ 1136 ip->i_nlink = 2; 1137 if (cnp->cn_flags & ISWHITEOUT) 1138 ip->i_flags |= UF_OPAQUE; 1139 error = ext2_update(tvp, 1); 1140 1141 /* 1142 * Bump link count in parent directory 1143 * to reflect work done below. Should 1144 * be done before reference is created 1145 * so reparation is possible if we crash. 1146 */ 1147 dp->i_nlink++; 1148 dp->i_flag |= IN_CHANGE; 1149 error = ext2_update(dvp, !DOINGASYNC(dvp)); 1150 if (error) 1151 goto bad; 1152 1153 /* Initialize directory with "." and ".." from static template. */ 1154 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1155 EXT2F_INCOMPAT_FTYPE)) 1156 dtp = &mastertemplate; 1157 else 1158 dtp = &omastertemplate; 1159 dirtemplate = *dtp; 1160 dirtemplate.dot_ino = ip->i_number; 1161 dirtemplate.dotdot_ino = dp->i_number; 1162 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 1163 * so let's just redefine it - for this function only 1164 */ 1165#undef DIRBLKSIZ 1166#define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize 1167 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12; 1168 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate, 1169 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE, 1170 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED, 1171 NULL, NULL); 1172 if (error) { 1173 dp->i_nlink--; 1174 dp->i_flag |= IN_CHANGE; 1175 goto bad; 1176 } 1177 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 1178 /* XXX should grow with balloc() */ 1179 panic("ext2_mkdir: blksize"); 1180 else { 1181 ip->i_size = DIRBLKSIZ; 1182 ip->i_flag |= IN_CHANGE; 1183 } 1184 1185 /* Directory set up, now install its entry in the parent directory. */ 1186 error = ext2_direnter(ip, dvp, cnp); 1187 if (error) { 1188 dp->i_nlink--; 1189 dp->i_flag |= IN_CHANGE; 1190 } 1191bad: 1192 /* 1193 * No need to do an explicit VOP_TRUNCATE here, vrele will do this 1194 * for us because we set the link count to 0. 1195 */ 1196 if (error) { 1197 ip->i_nlink = 0; 1198 ip->i_flag |= IN_CHANGE; 1199 vput(tvp); 1200 } else 1201 *ap->a_vpp = tvp; 1202out: 1203 return (error); 1204#undef DIRBLKSIZ 1205#define DIRBLKSIZ DEV_BSIZE 1206} 1207 1208/* 1209 * Rmdir system call. 1210 */ 1211static int 1212ext2_rmdir(struct vop_rmdir_args *ap) 1213{ 1214 struct vnode *vp = ap->a_vp; 1215 struct vnode *dvp = ap->a_dvp; 1216 struct componentname *cnp = ap->a_cnp; 1217 struct inode *ip, *dp; 1218 int error; 1219 1220 ip = VTOI(vp); 1221 dp = VTOI(dvp); 1222 1223 /* 1224 * Verify the directory is empty (and valid). 1225 * (Rmdir ".." won't be valid since 1226 * ".." will contain a reference to 1227 * the current directory and thus be 1228 * non-empty.) 1229 */ 1230 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) { 1231 error = ENOTEMPTY; 1232 goto out; 1233 } 1234 if ((dp->i_flags & APPEND) 1235 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1236 error = EPERM; 1237 goto out; 1238 } 1239 /* 1240 * Delete reference to directory before purging 1241 * inode. If we crash in between, the directory 1242 * will be reattached to lost+found, 1243 */ 1244 error = ext2_dirremove(dvp, cnp); 1245 if (error) 1246 goto out; 1247 dp->i_nlink--; 1248 dp->i_flag |= IN_CHANGE; 1249 cache_purge(dvp); 1250 VOP_UNLOCK(dvp, 0); 1251 /* 1252 * Truncate inode. The only stuff left 1253 * in the directory is "." and "..". The 1254 * "." reference is inconsequential since 1255 * we're quashing it. The ".." reference 1256 * has already been adjusted above. We've 1257 * removed the "." reference and the reference 1258 * in the parent directory, but there may be 1259 * other hard links so decrement by 2 and 1260 * worry about them later. 1261 */ 1262 ip->i_nlink -= 2; 1263 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, 1264 cnp->cn_thread); 1265 cache_purge(ITOV(ip)); 1266 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1267 VOP_UNLOCK(vp, 0); 1268 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1269 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1270 } 1271out: 1272 return (error); 1273} 1274 1275/* 1276 * symlink -- make a symbolic link 1277 */ 1278static int 1279ext2_symlink(struct vop_symlink_args *ap) 1280{ 1281 struct vnode *vp, **vpp = ap->a_vpp; 1282 struct inode *ip; 1283 int len, error; 1284 1285 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, 1286 vpp, ap->a_cnp); 1287 if (error) 1288 return (error); 1289 vp = *vpp; 1290 len = strlen(ap->a_target); 1291 if (len < vp->v_mount->mnt_maxsymlinklen) { 1292 ip = VTOI(vp); 1293 bcopy(ap->a_target, (char *)ip->i_shortlink, len); 1294 ip->i_size = len; 1295 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1296 } else 1297 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, 1298 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, 1299 ap->a_cnp->cn_cred, NOCRED, NULL, NULL); 1300 if (error) 1301 vput(vp); 1302 return (error); 1303} 1304 1305/* 1306 * Return target name of a symbolic link 1307 */ 1308static int 1309ext2_readlink(struct vop_readlink_args *ap) 1310{ 1311 struct vnode *vp = ap->a_vp; 1312 struct inode *ip = VTOI(vp); 1313 int isize; 1314 1315 isize = ip->i_size; 1316 if (isize < vp->v_mount->mnt_maxsymlinklen) { 1317 uiomove((char *)ip->i_shortlink, isize, ap->a_uio); 1318 return (0); 1319 } 1320 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); 1321} 1322 1323/* 1324 * Calculate the logical to physical mapping if not done already, 1325 * then call the device strategy routine. 1326 * 1327 * In order to be able to swap to a file, the ext2_bmaparray() operation may not 1328 * deadlock on memory. See ext2_bmap() for details. 1329 */ 1330static int 1331ext2_strategy(struct vop_strategy_args *ap) 1332{ 1333 struct buf *bp = ap->a_bp; 1334 struct vnode *vp = ap->a_vp; 1335 struct bufobj *bo; 1336 daddr_t blkno; 1337 int error; 1338 1339 if (vp->v_type == VBLK || vp->v_type == VCHR) 1340 panic("ext2_strategy: spec"); 1341 if (bp->b_blkno == bp->b_lblkno) { 1342 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL); 1343 bp->b_blkno = blkno; 1344 if (error) { 1345 bp->b_error = error; 1346 bp->b_ioflags |= BIO_ERROR; 1347 bufdone(bp); 1348 return (0); 1349 } 1350 if ((long)bp->b_blkno == -1) 1351 vfs_bio_clrbuf(bp); 1352 } 1353 if ((long)bp->b_blkno == -1) { 1354 bufdone(bp); 1355 return (0); 1356 } 1357 bp->b_iooffset = dbtob(bp->b_blkno); 1358 bo = VFSTOEXT2(vp->v_mount)->um_bo; 1359 BO_STRATEGY(bo, bp); 1360 return (0); 1361} 1362 1363/* 1364 * Print out the contents of an inode. 1365 */ 1366static int 1367ext2_print(struct vop_print_args *ap) 1368{ 1369 struct vnode *vp = ap->a_vp; 1370 struct inode *ip = VTOI(vp); 1371 1372 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number); 1373 if (vp->v_type == VFIFO) 1374 fifo_printinfo(vp); 1375 printf("\n"); 1376 return (0); 1377} 1378 1379/* 1380 * Close wrapper for fifos. 1381 * 1382 * Update the times on the inode then do device close. 1383 */ 1384static int 1385ext2fifo_close(struct vop_close_args *ap) 1386{ 1387 struct vnode *vp = ap->a_vp; 1388 1389 VI_LOCK(vp); 1390 if (vp->v_usecount > 1) 1391 ext2_itimes_locked(vp); 1392 VI_UNLOCK(vp); 1393 return (fifo_specops.vop_close(ap)); 1394} 1395 1396/* 1397 * Kqfilter wrapper for fifos. 1398 * 1399 * Fall through to ext2 kqfilter routines if needed 1400 */ 1401static int 1402ext2fifo_kqfilter(struct vop_kqfilter_args *ap) 1403{ 1404 int error; 1405 1406 error = fifo_specops.vop_kqfilter(ap); 1407 if (error) 1408 error = vfs_kqfilter(ap); 1409 return (error); 1410} 1411 1412/* 1413 * Return POSIX pathconf information applicable to ext2 filesystems. 1414 */ 1415static int 1416ext2_pathconf(struct vop_pathconf_args *ap) 1417{ 1418 int error = 0; 1419 1420 switch (ap->a_name) { 1421 case _PC_LINK_MAX: 1422 *ap->a_retval = EXT2_LINK_MAX; 1423 break; 1424 case _PC_NAME_MAX: 1425 *ap->a_retval = NAME_MAX; 1426 break; 1427 case _PC_PATH_MAX: 1428 *ap->a_retval = PATH_MAX; 1429 break; 1430 case _PC_PIPE_BUF: 1431 *ap->a_retval = PIPE_BUF; 1432 break; 1433 case _PC_CHOWN_RESTRICTED: 1434 *ap->a_retval = 1; 1435 break; 1436 case _PC_NO_TRUNC: 1437 *ap->a_retval = 1; 1438 break; 1439 case _PC_MIN_HOLE_SIZE: 1440 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1441 break; 1442 case _PC_ASYNC_IO: 1443 /* _PC_ASYNC_IO should have been handled by upper layers. */ 1444 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 1445 error = EINVAL; 1446 break; 1447 case _PC_PRIO_IO: 1448 *ap->a_retval = 0; 1449 break; 1450 case _PC_SYNC_IO: 1451 *ap->a_retval = 0; 1452 break; 1453 case _PC_ALLOC_SIZE_MIN: 1454 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize; 1455 break; 1456 case _PC_FILESIZEBITS: 1457 *ap->a_retval = 64; 1458 break; 1459 case _PC_REC_INCR_XFER_SIZE: 1460 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1461 break; 1462 case _PC_REC_MAX_XFER_SIZE: 1463 *ap->a_retval = -1; /* means ``unlimited'' */ 1464 break; 1465 case _PC_REC_MIN_XFER_SIZE: 1466 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize; 1467 break; 1468 case _PC_REC_XFER_ALIGN: 1469 *ap->a_retval = PAGE_SIZE; 1470 break; 1471 case _PC_SYMLINK_MAX: 1472 *ap->a_retval = MAXPATHLEN; 1473 break; 1474 1475 default: 1476 error = EINVAL; 1477 break; 1478 } 1479 return (error); 1480} 1481 1482/* 1483 * Vnode pointer to File handle 1484 */ 1485/* ARGSUSED */ 1486static int 1487ext2_vptofh(struct vop_vptofh_args *ap) 1488{ 1489 struct inode *ip; 1490 struct ufid *ufhp; 1491 1492 ip = VTOI(ap->a_vp); 1493 ufhp = (struct ufid *)ap->a_fhp; 1494 ufhp->ufid_len = sizeof(struct ufid); 1495 ufhp->ufid_ino = ip->i_number; 1496 ufhp->ufid_gen = ip->i_gen; 1497 return (0); 1498} 1499 1500/* 1501 * Initialize the vnode associated with a new inode, handle aliased 1502 * vnodes. 1503 */ 1504int 1505ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp) 1506{ 1507 struct inode *ip; 1508 struct vnode *vp; 1509 1510 vp = *vpp; 1511 ip = VTOI(vp); 1512 vp->v_type = IFTOVT(ip->i_mode); 1513 if (vp->v_type == VFIFO) 1514 vp->v_op = fifoops; 1515 1516 if (ip->i_number == EXT2_ROOTINO) 1517 vp->v_vflag |= VV_ROOT; 1518 ip->i_modrev = init_va_filerev(); 1519 *vpp = vp; 1520 return (0); 1521} 1522 1523/* 1524 * Allocate a new inode. 1525 */ 1526static int 1527ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp, 1528 struct componentname *cnp) 1529{ 1530 struct inode *ip, *pdir; 1531 struct vnode *tvp; 1532 int error; 1533 1534 pdir = VTOI(dvp); 1535#ifdef INVARIANTS 1536 if ((cnp->cn_flags & HASBUF) == 0) 1537 panic("ext2_makeinode: no name"); 1538#endif 1539 *vpp = NULL; 1540 if ((mode & IFMT) == 0) 1541 mode |= IFREG; 1542 1543 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp); 1544 if (error) { 1545 return (error); 1546 } 1547 ip = VTOI(tvp); 1548 ip->i_gid = pdir->i_gid; 1549#ifdef SUIDDIR 1550 { 1551 /* 1552 * if we are 1553 * not the owner of the directory, 1554 * and we are hacking owners here, (only do this where told to) 1555 * and we are not giving it TOO root, (would subvert quotas) 1556 * then go ahead and give it to the other user. 1557 * Note that this drops off the execute bits for security. 1558 */ 1559 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) && 1560 (pdir->i_mode & ISUID) && 1561 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) { 1562 ip->i_uid = pdir->i_uid; 1563 mode &= ~07111; 1564 } else { 1565 ip->i_uid = cnp->cn_cred->cr_uid; 1566 } 1567 } 1568#else 1569 ip->i_uid = cnp->cn_cred->cr_uid; 1570#endif 1571 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1572 ip->i_mode = mode; 1573 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */ 1574 ip->i_nlink = 1; 1575 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) { 1576 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0)) 1577 ip->i_mode &= ~ISGID; 1578 } 1579 1580 if (cnp->cn_flags & ISWHITEOUT) 1581 ip->i_flags |= UF_OPAQUE; 1582 1583 /* 1584 * Make sure inode goes to disk before directory entry. 1585 */ 1586 error = ext2_update(tvp, !DOINGASYNC(tvp)); 1587 if (error) 1588 goto bad; 1589 error = ext2_direnter(ip, dvp, cnp); 1590 if (error) 1591 goto bad; 1592 1593 *vpp = tvp; 1594 return (0); 1595 1596bad: 1597 /* 1598 * Write error occurred trying to update the inode 1599 * or the directory so must deallocate the inode. 1600 */ 1601 ip->i_nlink = 0; 1602 ip->i_flag |= IN_CHANGE; 1603 vput(tvp); 1604 return (error); 1605} 1606 1607/* 1608 * Vnode op for reading. 1609 */ 1610static int 1611ext2_read(struct vop_read_args *ap) 1612{ 1613 struct vnode *vp; 1614 struct inode *ip; 1615 int error; 1616 1617 vp = ap->a_vp; 1618 ip = VTOI(vp); 1619 1620 /*EXT4_EXT_LOCK(ip);*/ 1621 if (ip->i_flag & IN_E4EXTENTS) 1622 error = ext4_ext_read(ap); 1623 else 1624 error = ext2_ind_read(ap); 1625 /*EXT4_EXT_UNLOCK(ip);*/ 1626 return (error); 1627} 1628 1629/* 1630 * Vnode op for reading. 1631 */ 1632static int 1633ext2_ind_read(struct vop_read_args *ap) 1634{ 1635 struct vnode *vp; 1636 struct inode *ip; 1637 struct uio *uio; 1638 struct m_ext2fs *fs; 1639 struct buf *bp; 1640 daddr_t lbn, nextlbn; 1641 off_t bytesinfile; 1642 long size, xfersize, blkoffset; 1643 int error, orig_resid, seqcount; 1644 int ioflag; 1645 1646 vp = ap->a_vp; 1647 uio = ap->a_uio; 1648 ioflag = ap->a_ioflag; 1649 1650 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 1651 ip = VTOI(vp); 1652 1653#ifdef INVARIANTS 1654 if (uio->uio_rw != UIO_READ) 1655 panic("%s: mode", "ext2_read"); 1656 1657 if (vp->v_type == VLNK) { 1658 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 1659 panic("%s: short symlink", "ext2_read"); 1660 } else if (vp->v_type != VREG && vp->v_type != VDIR) 1661 panic("%s: type %d", "ext2_read", vp->v_type); 1662#endif 1663 orig_resid = uio->uio_resid; 1664 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0")); 1665 if (orig_resid == 0) 1666 return (0); 1667 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0")); 1668 fs = ip->i_e2fs; 1669 if (uio->uio_offset < ip->i_size && 1670 uio->uio_offset >= fs->e2fs_maxfilesize) 1671 return (EOVERFLOW); 1672 1673 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1674 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1675 break; 1676 lbn = lblkno(fs, uio->uio_offset); 1677 nextlbn = lbn + 1; 1678 size = blksize(fs, ip, lbn); 1679 blkoffset = blkoff(fs, uio->uio_offset); 1680 1681 xfersize = fs->e2fs_fsize - blkoffset; 1682 if (uio->uio_resid < xfersize) 1683 xfersize = uio->uio_resid; 1684 if (bytesinfile < xfersize) 1685 xfersize = bytesinfile; 1686 1687 if (lblktosize(fs, nextlbn) >= ip->i_size) 1688 error = bread(vp, lbn, size, NOCRED, &bp); 1689 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 1690 error = cluster_read(vp, ip->i_size, lbn, size, 1691 NOCRED, blkoffset + uio->uio_resid, seqcount, 1692 0, &bp); 1693 } else if (seqcount > 1) { 1694 u_int nextsize = blksize(fs, ip, nextlbn); 1695 error = breadn(vp, lbn, 1696 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1697 } else 1698 error = bread(vp, lbn, size, NOCRED, &bp); 1699 if (error) { 1700 brelse(bp); 1701 bp = NULL; 1702 break; 1703 } 1704 1705 /* 1706 * If IO_DIRECT then set B_DIRECT for the buffer. This 1707 * will cause us to attempt to release the buffer later on 1708 * and will cause the buffer cache to attempt to free the 1709 * underlying pages. 1710 */ 1711 if (ioflag & IO_DIRECT) 1712 bp->b_flags |= B_DIRECT; 1713 1714 /* 1715 * We should only get non-zero b_resid when an I/O error 1716 * has occurred, which should cause us to break above. 1717 * However, if the short read did not cause an error, 1718 * then we want to ensure that we do not uiomove bad 1719 * or uninitialized data. 1720 */ 1721 size -= bp->b_resid; 1722 if (size < xfersize) { 1723 if (size == 0) 1724 break; 1725 xfersize = size; 1726 } 1727 error = uiomove((char *)bp->b_data + blkoffset, 1728 (int)xfersize, uio); 1729 if (error) 1730 break; 1731 1732 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1733 /* 1734 * If it's VMIO or direct I/O, then we don't 1735 * need the buf, mark it available for 1736 * freeing. If it's non-direct VMIO, the VM has 1737 * the data. 1738 */ 1739 bp->b_flags |= B_RELBUF; 1740 brelse(bp); 1741 } else { 1742 /* 1743 * Otherwise let whoever 1744 * made the request take care of 1745 * freeing it. We just queue 1746 * it onto another list. 1747 */ 1748 bqrelse(bp); 1749 } 1750 } 1751 1752 /* 1753 * This can only happen in the case of an error 1754 * because the loop above resets bp to NULL on each iteration 1755 * and on normal completion has not set a new value into it. 1756 * so it must have come from a 'break' statement 1757 */ 1758 if (bp != NULL) { 1759 if (ioflag & (IO_VMIO|IO_DIRECT)) { 1760 bp->b_flags |= B_RELBUF; 1761 brelse(bp); 1762 } else { 1763 bqrelse(bp); 1764 } 1765 } 1766 1767 if ((error == 0 || uio->uio_resid != orig_resid) && 1768 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 1769 ip->i_flag |= IN_ACCESS; 1770 return (error); 1771} 1772 1773static int 1774ext2_ioctl(struct vop_ioctl_args *ap) 1775{ 1776 1777 switch (ap->a_command) { 1778 case FIOSEEKDATA: 1779 case FIOSEEKHOLE: 1780 return (vn_bmap_seekhole(ap->a_vp, ap->a_command, 1781 (off_t *)ap->a_data, ap->a_cred)); 1782 default: 1783 return (ENOTTY); 1784 } 1785} 1786 1787/* 1788 * this function handles ext4 extents block mapping 1789 */ 1790static int 1791ext4_ext_read(struct vop_read_args *ap) 1792{ 1793 struct vnode *vp; 1794 struct inode *ip; 1795 struct uio *uio; 1796 struct m_ext2fs *fs; 1797 struct buf *bp; 1798 struct ext4_extent nex, *ep; 1799 struct ext4_extent_path path; 1800 daddr_t lbn, newblk; 1801 off_t bytesinfile; 1802 int cache_type; 1803 ssize_t orig_resid; 1804 int error; 1805 long size, xfersize, blkoffset; 1806 1807 vp = ap->a_vp; 1808 ip = VTOI(vp); 1809 uio = ap->a_uio; 1810 memset(&path, 0, sizeof(path)); 1811 1812 orig_resid = uio->uio_resid; 1813 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__)); 1814 if (orig_resid == 0) 1815 return (0); 1816 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__)); 1817 fs = ip->i_e2fs; 1818 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize) 1819 return (EOVERFLOW); 1820 1821 while (uio->uio_resid > 0) { 1822 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 1823 break; 1824 lbn = lblkno(fs, uio->uio_offset); 1825 size = blksize(fs, ip, lbn); 1826 blkoffset = blkoff(fs, uio->uio_offset); 1827 1828 xfersize = fs->e2fs_fsize - blkoffset; 1829 xfersize = MIN(xfersize, uio->uio_resid); 1830 xfersize = MIN(xfersize, bytesinfile); 1831 1832 /* get block from ext4 extent cache */ 1833 cache_type = ext4_ext_in_cache(ip, lbn, &nex); 1834 switch (cache_type) { 1835 case EXT4_EXT_CACHE_NO: 1836 ext4_ext_find_extent(fs, ip, lbn, &path); 1837 ep = path.ep_ext; 1838 if (ep == NULL) 1839 return (EIO); 1840 1841 ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN); 1842 1843 newblk = lbn - ep->e_blk + (ep->e_start_lo | 1844 (daddr_t)ep->e_start_hi << 32); 1845 1846 if (path.ep_bp != NULL) { 1847 brelse(path.ep_bp); 1848 path.ep_bp = NULL; 1849 } 1850 break; 1851 1852 case EXT4_EXT_CACHE_GAP: 1853 /* block has not been allocated yet */ 1854 return (0); 1855 1856 case EXT4_EXT_CACHE_IN: 1857 newblk = lbn - nex.e_blk + (nex.e_start_lo | 1858 (daddr_t)nex.e_start_hi << 32); 1859 break; 1860 1861 default: 1862 panic("%s: invalid cache type", __func__); 1863 } 1864 1865 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp); 1866 if (error) { 1867 brelse(bp); 1868 return (error); 1869 } 1870 1871 size -= bp->b_resid; 1872 if (size < xfersize) { 1873 if (size == 0) { 1874 bqrelse(bp); 1875 break; 1876 } 1877 xfersize = size; 1878 } 1879 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio); 1880 bqrelse(bp); 1881 if (error) 1882 return (error); 1883 } 1884 1885 return (0); 1886} 1887 1888/* 1889 * Vnode op for writing. 1890 */ 1891static int 1892ext2_write(struct vop_write_args *ap) 1893{ 1894 struct vnode *vp; 1895 struct uio *uio; 1896 struct inode *ip; 1897 struct m_ext2fs *fs; 1898 struct buf *bp; 1899 daddr_t lbn; 1900 off_t osize; 1901 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize; 1902 1903 ioflag = ap->a_ioflag; 1904 uio = ap->a_uio; 1905 vp = ap->a_vp; 1906 1907 seqcount = ioflag >> IO_SEQSHIFT; 1908 ip = VTOI(vp); 1909 1910#ifdef INVARIANTS 1911 if (uio->uio_rw != UIO_WRITE) 1912 panic("%s: mode", "ext2_write"); 1913#endif 1914 1915 switch (vp->v_type) { 1916 case VREG: 1917 if (ioflag & IO_APPEND) 1918 uio->uio_offset = ip->i_size; 1919 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 1920 return (EPERM); 1921 /* FALLTHROUGH */ 1922 case VLNK: 1923 break; 1924 case VDIR: 1925 /* XXX differs from ffs -- this is called from ext2_mkdir(). */ 1926 if ((ioflag & IO_SYNC) == 0) 1927 panic("ext2_write: nonsync dir write"); 1928 break; 1929 default: 1930 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp, 1931 vp->v_type, (intmax_t)uio->uio_offset, 1932 (intmax_t)uio->uio_resid); 1933 } 1934 1935 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0")); 1936 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0")); 1937 fs = ip->i_e2fs; 1938 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize) 1939 return (EFBIG); 1940 /* 1941 * Maybe this should be above the vnode op call, but so long as 1942 * file servers have no limits, I don't think it matters. 1943 */ 1944 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 1945 return (EFBIG); 1946 1947 resid = uio->uio_resid; 1948 osize = ip->i_size; 1949 if (seqcount > BA_SEQMAX) 1950 flags = BA_SEQMAX << BA_SEQSHIFT; 1951 else 1952 flags = seqcount << BA_SEQSHIFT; 1953 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1954 flags |= IO_SYNC; 1955 1956 for (error = 0; uio->uio_resid > 0;) { 1957 lbn = lblkno(fs, uio->uio_offset); 1958 blkoffset = blkoff(fs, uio->uio_offset); 1959 xfersize = fs->e2fs_fsize - blkoffset; 1960 if (uio->uio_resid < xfersize) 1961 xfersize = uio->uio_resid; 1962 if (uio->uio_offset + xfersize > ip->i_size) 1963 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 1964 1965 /* 1966 * We must perform a read-before-write if the transfer size 1967 * does not cover the entire buffer. 1968 */ 1969 if (fs->e2fs_bsize > xfersize) 1970 flags |= BA_CLRBUF; 1971 else 1972 flags &= ~BA_CLRBUF; 1973 error = ext2_balloc(ip, lbn, blkoffset + xfersize, 1974 ap->a_cred, &bp, flags); 1975 if (error != 0) 1976 break; 1977 1978 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 1979 bp->b_flags |= B_NOCACHE; 1980 if (uio->uio_offset + xfersize > ip->i_size) 1981 ip->i_size = uio->uio_offset + xfersize; 1982 size = blksize(fs, ip, lbn) - bp->b_resid; 1983 if (size < xfersize) 1984 xfersize = size; 1985 1986 error = 1987 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1988 /* 1989 * If the buffer is not already filled and we encounter an 1990 * error while trying to fill it, we have to clear out any 1991 * garbage data from the pages instantiated for the buffer. 1992 * If we do not, a failed uiomove() during a write can leave 1993 * the prior contents of the pages exposed to a userland mmap. 1994 * 1995 * Note that we need only clear buffers with a transfer size 1996 * equal to the block size because buffers with a shorter 1997 * transfer size were cleared above by the call to ext2_balloc() 1998 * with the BA_CLRBUF flag set. 1999 * 2000 * If the source region for uiomove identically mmaps the 2001 * buffer, uiomove() performed the NOP copy, and the buffer 2002 * content remains valid because the page fault handler 2003 * validated the pages. 2004 */ 2005 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 2006 fs->e2fs_bsize == xfersize) 2007 vfs_bio_clrbuf(bp); 2008 if (ioflag & (IO_VMIO|IO_DIRECT)) { 2009 bp->b_flags |= B_RELBUF; 2010 } 2011 2012 /* 2013 * If IO_SYNC each buffer is written synchronously. Otherwise 2014 * if we have a severe page deficiency write the buffer 2015 * asynchronously. Otherwise try to cluster, and if that 2016 * doesn't do it then either do an async write (if O_DIRECT), 2017 * or a delayed write (if not). 2018 */ 2019 if (ioflag & IO_SYNC) { 2020 (void)bwrite(bp); 2021 } else if (vm_page_count_severe() || 2022 buf_dirty_count_severe() || 2023 (ioflag & IO_ASYNC)) { 2024 bp->b_flags |= B_CLUSTEROK; 2025 bawrite(bp); 2026 } else if (xfersize + blkoffset == fs->e2fs_fsize) { 2027 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 2028 bp->b_flags |= B_CLUSTEROK; 2029 cluster_write(vp, bp, ip->i_size, seqcount, 0); 2030 } else { 2031 bawrite(bp); 2032 } 2033 } else if (ioflag & IO_DIRECT) { 2034 bp->b_flags |= B_CLUSTEROK; 2035 bawrite(bp); 2036 } else { 2037 bp->b_flags |= B_CLUSTEROK; 2038 bdwrite(bp); 2039 } 2040 if (error || xfersize == 0) 2041 break; 2042 } 2043 /* 2044 * If we successfully wrote any data, and we are not the superuser 2045 * we clear the setuid and setgid bits as a precaution against 2046 * tampering. 2047 */ 2048 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 2049 ap->a_cred) { 2050 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 2051 ip->i_mode &= ~(ISUID | ISGID); 2052 } 2053 if (error) { 2054 if (ioflag & IO_UNIT) { 2055 (void)ext2_truncate(vp, osize, 2056 ioflag & IO_SYNC, ap->a_cred, uio->uio_td); 2057 uio->uio_offset -= resid - uio->uio_resid; 2058 uio->uio_resid = resid; 2059 } 2060 } 2061 if (uio->uio_resid != resid) { 2062 ip->i_flag |= IN_CHANGE | IN_UPDATE; 2063 if (ioflag & IO_SYNC) 2064 error = ext2_update(vp, 1); 2065 } 2066 return (error); 2067} 2068 2069/* 2070 * get page routine 2071 */ 2072static int 2073ext2_getpages(struct vop_getpages_args *ap) 2074{ 2075 int i; 2076 vm_page_t mreq; 2077 int pcount; 2078 2079 pcount = round_page(ap->a_count) / PAGE_SIZE; 2080 mreq = ap->a_m[ap->a_reqpage]; 2081 2082 /* 2083 * if ANY DEV_BSIZE blocks are valid on a large filesystem block, 2084 * then the entire page is valid. Since the page may be mapped, 2085 * user programs might reference data beyond the actual end of file 2086 * occuring within the page. We have to zero that data. 2087 */ 2088 VM_OBJECT_WLOCK(mreq->object); 2089 if (mreq->valid) { 2090 if (mreq->valid != VM_PAGE_BITS_ALL) 2091 vm_page_zero_invalid(mreq, TRUE); 2092 for (i = 0; i < pcount; i++) { 2093 if (i != ap->a_reqpage) { 2094 vm_page_lock(ap->a_m[i]); 2095 vm_page_free(ap->a_m[i]); 2096 vm_page_unlock(ap->a_m[i]); 2097 } 2098 } 2099 VM_OBJECT_WUNLOCK(mreq->object); 2100 return VM_PAGER_OK; 2101 } 2102 VM_OBJECT_WUNLOCK(mreq->object); 2103 2104 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 2105 ap->a_count, 2106 ap->a_reqpage); 2107} 2108