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 * SPDX-License-Identifier: BSD-3-Clause
9 *
10 * Copyright (c) 1982, 1986, 1989, 1993
11 * The Regents of the University of California. All rights reserved.
12 * (c) UNIX System Laboratories, Inc.
13 * All or some portions of this file are derived from material licensed
14 * to the University of California by American Telephone and Telegraph
15 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
16 * the permission of UNIX System Laboratories, Inc.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
43 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
44 * $FreeBSD$
45 */
46
47 #include "opt_suiddir.h"
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/fcntl.h>
53 #include <sys/filio.h>
54 #include <sys/limits.h>
55 #include <sys/sdt.h>
56 #include <sys/stat.h>
57 #include <sys/bio.h>
58 #include <sys/buf.h>
59 #include <sys/endian.h>
60 #include <sys/priv.h>
61 #include <sys/rwlock.h>
62 #include <sys/mount.h>
63 #include <sys/unistd.h>
64 #include <sys/time.h>
65 #include <sys/vnode.h>
66 #include <sys/namei.h>
67 #include <sys/lockf.h>
68 #include <sys/event.h>
69 #include <sys/conf.h>
70 #include <sys/file.h>
71 #include <sys/extattr.h>
72 #include <sys/vmmeter.h>
73
74 #include <vm/vm.h>
75 #include <vm/vm_param.h>
76 #include <vm/vm_extern.h>
77 #include <vm/vm_object.h>
78 #include <vm/vm_page.h>
79 #include <vm/vm_pager.h>
80 #include <vm/vnode_pager.h>
81
82 #include "opt_directio.h"
83
84 #include <ufs/ufs/dir.h>
85
86 #include <fs/ext2fs/fs.h>
87 #include <fs/ext2fs/inode.h>
88 #include <fs/ext2fs/ext2_acl.h>
89 #include <fs/ext2fs/ext2fs.h>
90 #include <fs/ext2fs/ext2_extern.h>
91 #include <fs/ext2fs/ext2_dinode.h>
92 #include <fs/ext2fs/ext2_dir.h>
93 #include <fs/ext2fs/ext2_mount.h>
94 #include <fs/ext2fs/ext2_extattr.h>
95 #include <fs/ext2fs/ext2_extents.h>
96
97 SDT_PROVIDER_DECLARE(ext2fs);
98 /*
99 * ext2fs trace probe:
100 * arg0: verbosity. Higher numbers give more verbose messages
101 * arg1: Textual message
102 */
103 SDT_PROBE_DEFINE2(ext2fs, , vnops, trace, "int", "char*");
104
105 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
106 static void ext2_itimes_locked(struct vnode *);
107
108 static vop_access_t ext2_access;
109 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
110 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
111 struct thread *);
112 static vop_close_t ext2_close;
113 static vop_create_t ext2_create;
114 static vop_fsync_t ext2_fsync;
115 static vop_getattr_t ext2_getattr;
116 static vop_ioctl_t ext2_ioctl;
117 static vop_link_t ext2_link;
118 static vop_mkdir_t ext2_mkdir;
119 static vop_mknod_t ext2_mknod;
120 static vop_open_t ext2_open;
121 static vop_pathconf_t ext2_pathconf;
122 static vop_print_t ext2_print;
123 static vop_read_t ext2_read;
124 static vop_readlink_t ext2_readlink;
125 static vop_remove_t ext2_remove;
126 static vop_rename_t ext2_rename;
127 static vop_rmdir_t ext2_rmdir;
128 static vop_setattr_t ext2_setattr;
129 static vop_strategy_t ext2_strategy;
130 static vop_symlink_t ext2_symlink;
131 static vop_write_t ext2_write;
132 static vop_deleteextattr_t ext2_deleteextattr;
133 static vop_getextattr_t ext2_getextattr;
134 static vop_listextattr_t ext2_listextattr;
135 static vop_setextattr_t ext2_setextattr;
136 static vop_vptofh_t ext2_vptofh;
137 static vop_close_t ext2fifo_close;
138
139 /* Global vfs data structures for ext2. */
140 struct vop_vector ext2_vnodeops = {
141 .vop_default = &default_vnodeops,
142 .vop_access = ext2_access,
143 .vop_bmap = ext2_bmap,
144 .vop_cachedlookup = ext2_lookup,
145 .vop_close = ext2_close,
146 .vop_create = ext2_create,
147 .vop_fsync = ext2_fsync,
148 .vop_getpages = vnode_pager_local_getpages,
149 .vop_getpages_async = vnode_pager_local_getpages_async,
150 .vop_getattr = ext2_getattr,
151 .vop_inactive = ext2_inactive,
152 .vop_ioctl = ext2_ioctl,
153 .vop_link = ext2_link,
154 .vop_lookup = vfs_cache_lookup,
155 .vop_mkdir = ext2_mkdir,
156 .vop_mknod = ext2_mknod,
157 .vop_open = ext2_open,
158 .vop_pathconf = ext2_pathconf,
159 .vop_poll = vop_stdpoll,
160 .vop_print = ext2_print,
161 .vop_read = ext2_read,
162 .vop_readdir = ext2_readdir,
163 .vop_readlink = ext2_readlink,
164 .vop_reallocblks = ext2_reallocblks,
165 .vop_reclaim = ext2_reclaim,
166 .vop_remove = ext2_remove,
167 .vop_rename = ext2_rename,
168 .vop_rmdir = ext2_rmdir,
169 .vop_setattr = ext2_setattr,
170 .vop_strategy = ext2_strategy,
171 .vop_symlink = ext2_symlink,
172 .vop_write = ext2_write,
173 .vop_deleteextattr = ext2_deleteextattr,
174 .vop_getextattr = ext2_getextattr,
175 .vop_listextattr = ext2_listextattr,
176 .vop_setextattr = ext2_setextattr,
177 #ifdef UFS_ACL
178 .vop_getacl = ext2_getacl,
179 .vop_setacl = ext2_setacl,
180 .vop_aclcheck = ext2_aclcheck,
181 #endif /* UFS_ACL */
182 .vop_vptofh = ext2_vptofh,
183 };
184 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops);
185
186 struct vop_vector ext2_fifoops = {
187 .vop_default = &fifo_specops,
188 .vop_access = ext2_access,
189 .vop_close = ext2fifo_close,
190 .vop_fsync = ext2_fsync,
191 .vop_getattr = ext2_getattr,
192 .vop_inactive = ext2_inactive,
193 .vop_pathconf = ext2_pathconf,
194 .vop_print = ext2_print,
195 .vop_read = VOP_PANIC,
196 .vop_reclaim = ext2_reclaim,
197 .vop_setattr = ext2_setattr,
198 .vop_write = VOP_PANIC,
199 .vop_vptofh = ext2_vptofh,
200 };
201 VFS_VOP_VECTOR_REGISTER(ext2_fifoops);
202
203 /*
204 * A virgin directory (no blushing please).
205 * Note that the type and namlen fields are reversed relative to ext2.
206 * Also, we don't use `struct odirtemplate', since it would just cause
207 * endianness problems.
208 */
209 static struct dirtemplate mastertemplate = {
210 0, htole16(12), 1, EXT2_FT_DIR, ".",
211 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".."
212 };
213 static struct dirtemplate omastertemplate = {
214 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".",
215 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".."
216 };
217
218 static void
219 ext2_itimes_locked(struct vnode *vp)
220 {
221 struct inode *ip;
222 struct timespec ts;
223
224 ASSERT_VI_LOCKED(vp, __func__);
225
226 ip = VTOI(vp);
227 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
228 return;
229 if ((vp->v_type == VBLK || vp->v_type == VCHR))
230 ip->i_flag |= IN_LAZYMOD;
231 else
232 ip->i_flag |= IN_MODIFIED;
233 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
234 vfs_timestamp(&ts);
235 if (ip->i_flag & IN_ACCESS) {
236 ip->i_atime = ts.tv_sec;
237 ip->i_atimensec = ts.tv_nsec;
238 }
239 if (ip->i_flag & IN_UPDATE) {
240 ip->i_mtime = ts.tv_sec;
241 ip->i_mtimensec = ts.tv_nsec;
242 ip->i_modrev++;
243 }
244 if (ip->i_flag & IN_CHANGE) {
245 ip->i_ctime = ts.tv_sec;
246 ip->i_ctimensec = ts.tv_nsec;
247 }
248 }
249 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
250 }
251
252 void
253 ext2_itimes(struct vnode *vp)
254 {
255
256 VI_LOCK(vp);
257 ext2_itimes_locked(vp);
258 VI_UNLOCK(vp);
259 }
260
261 /*
262 * Create a regular file
263 */
264 static int
265 ext2_create(struct vop_create_args *ap)
266 {
267 int error;
268
269 error =
270 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
271 ap->a_dvp, ap->a_vpp, ap->a_cnp);
272 if (error != 0)
273 return (error);
274 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
275 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
276 return (0);
277 }
278
279 static int
280 ext2_open(struct vop_open_args *ap)
281 {
282
283 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
284 return (EOPNOTSUPP);
285
286 /*
287 * Files marked append-only must be opened for appending.
288 */
289 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
290 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
291 return (EPERM);
292
293 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
294
295 return (0);
296 }
297
298 /*
299 * Close called.
300 *
301 * Update the times on the inode.
302 */
303 static int
304 ext2_close(struct vop_close_args *ap)
305 {
306 struct vnode *vp = ap->a_vp;
307
308 VI_LOCK(vp);
309 if (vp->v_usecount > 1)
310 ext2_itimes_locked(vp);
311 VI_UNLOCK(vp);
312 return (0);
313 }
314
315 static int
316 ext2_access(struct vop_access_args *ap)
317 {
318 struct vnode *vp = ap->a_vp;
319 struct inode *ip = VTOI(vp);
320 accmode_t accmode = ap->a_accmode;
321 int error;
322
323 /*
324 * Disallow write attempts on read-only file systems;
325 * unless the file is a socket, fifo, or a block or
326 * character device resident on the file system.
327 */
328 if (accmode & VWRITE) {
329 switch (vp->v_type) {
330 case VDIR:
331 case VLNK:
332 case VREG:
333 if (vp->v_mount->mnt_flag & MNT_RDONLY)
334 return (EROFS);
335 break;
336 default:
337 break;
338 }
339 }
340
341 /* If immutable bit set, nobody gets to write it. */
342 if ((accmode & VWRITE) && (ip->i_flags & SF_IMMUTABLE))
343 return (EPERM);
344
345 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
346 ap->a_accmode, ap->a_cred);
347 return (error);
348 }
349
350 static int
351 ext2_getattr(struct vop_getattr_args *ap)
352 {
353 struct vnode *vp = ap->a_vp;
354 struct inode *ip = VTOI(vp);
355 struct vattr *vap = ap->a_vap;
356
357 ext2_itimes(vp);
358 /*
359 * Copy from inode table
360 */
361 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
362 vap->va_fileid = ip->i_number;
363 vap->va_mode = ip->i_mode & ~IFMT;
364 vap->va_nlink = ip->i_nlink;
365 vap->va_uid = ip->i_uid;
366 vap->va_gid = ip->i_gid;
367 vap->va_rdev = ip->i_rdev;
368 vap->va_size = ip->i_size;
369 vap->va_atime.tv_sec = ip->i_atime;
370 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
371 vap->va_mtime.tv_sec = ip->i_mtime;
372 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
373 vap->va_ctime.tv_sec = ip->i_ctime;
374 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
375 if (E2DI_HAS_XTIME(ip)) {
376 vap->va_birthtime.tv_sec = ip->i_birthtime;
377 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
378 }
379 vap->va_flags = ip->i_flags;
380 vap->va_gen = ip->i_gen;
381 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
382 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
383 vap->va_type = IFTOVT(ip->i_mode);
384 vap->va_filerev = ip->i_modrev;
385 return (0);
386 }
387
388 /*
389 * Set attribute vnode op. called from several syscalls
390 */
391 static int
392 ext2_setattr(struct vop_setattr_args *ap)
393 {
394 struct vattr *vap = ap->a_vap;
395 struct vnode *vp = ap->a_vp;
396 struct inode *ip = VTOI(vp);
397 struct ucred *cred = ap->a_cred;
398 struct thread *td = curthread;
399 int error;
400
401 /*
402 * Check for unsettable attributes.
403 */
404 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
405 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
406 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
407 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
408 return (EINVAL);
409 }
410 if (vap->va_flags != VNOVAL) {
411 /* Disallow flags not supported by ext2fs. */
412 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
413 return (EOPNOTSUPP);
414
415 if (vp->v_mount->mnt_flag & MNT_RDONLY)
416 return (EROFS);
417 /*
418 * Callers may only modify the file flags on objects they
419 * have VADMIN rights for.
420 */
421 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
422 return (error);
423 /*
424 * Unprivileged processes and privileged processes in
425 * jail() are not permitted to unset system flags, or
426 * modify flags if any system flags are set.
427 * Privileged non-jail processes may not modify system flags
428 * if securelevel > 0 and any existing system flags are set.
429 */
430 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) {
431 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
432 error = securelevel_gt(cred, 0);
433 if (error)
434 return (error);
435 }
436 } else {
437 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
438 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
439 return (EPERM);
440 }
441 ip->i_flags = vap->va_flags;
442 ip->i_flag |= IN_CHANGE;
443 if (ip->i_flags & (IMMUTABLE | APPEND))
444 return (0);
445 }
446 if (ip->i_flags & (IMMUTABLE | APPEND))
447 return (EPERM);
448 /*
449 * Go through the fields and update iff not VNOVAL.
450 */
451 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
452 if (vp->v_mount->mnt_flag & MNT_RDONLY)
453 return (EROFS);
454 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
455 td)) != 0)
456 return (error);
457 }
458 if (vap->va_size != VNOVAL) {
459 /*
460 * Disallow write attempts on read-only file systems;
461 * unless the file is a socket, fifo, or a block or
462 * character device resident on the file system.
463 */
464 switch (vp->v_type) {
465 case VDIR:
466 return (EISDIR);
467 case VLNK:
468 case VREG:
469 if (vp->v_mount->mnt_flag & MNT_RDONLY)
470 return (EROFS);
471 break;
472 default:
473 break;
474 }
475 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
476 return (error);
477 }
478 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
479 if (vp->v_mount->mnt_flag & MNT_RDONLY)
480 return (EROFS);
481 /*
482 * From utimes(2):
483 * If times is NULL, ... The caller must be the owner of
484 * the file, have permission to write the file, or be the
485 * super-user.
486 * If times is non-NULL, ... The caller must be the owner of
487 * the file or be the super-user.
488 */
489 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
490 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
491 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
492 return (error);
493 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
494 if (vap->va_atime.tv_sec != VNOVAL) {
495 ip->i_flag &= ~IN_ACCESS;
496 ip->i_atime = vap->va_atime.tv_sec;
497 ip->i_atimensec = vap->va_atime.tv_nsec;
498 }
499 if (vap->va_mtime.tv_sec != VNOVAL) {
500 ip->i_flag &= ~IN_UPDATE;
501 ip->i_mtime = vap->va_mtime.tv_sec;
502 ip->i_mtimensec = vap->va_mtime.tv_nsec;
503 }
504 if (E2DI_HAS_XTIME(ip) && vap->va_birthtime.tv_sec != VNOVAL) {
505 ip->i_birthtime = vap->va_birthtime.tv_sec;
506 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
507 }
508 error = ext2_update(vp, 0);
509 if (error)
510 return (error);
511 }
512 error = 0;
513 if (vap->va_mode != (mode_t)VNOVAL) {
514 if (vp->v_mount->mnt_flag & MNT_RDONLY)
515 return (EROFS);
516 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
517 }
518 return (error);
519 }
520
521 /*
522 * Change the mode on a file.
523 * Inode must be locked before calling.
524 */
525 static int
526 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
527 {
528 struct inode *ip = VTOI(vp);
529 int error;
530
531 /*
532 * To modify the permissions on a file, must possess VADMIN
533 * for that file.
534 */
535 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
536 return (error);
537 /*
538 * Privileged processes may set the sticky bit on non-directories,
539 * as well as set the setgid bit on a file with a group that the
540 * process is not a member of.
541 */
542 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
543 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE);
544 if (error)
545 return (EFTYPE);
546 }
547 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
548 error = priv_check_cred(cred, PRIV_VFS_SETGID);
549 if (error)
550 return (error);
551 }
552 ip->i_mode &= ~ALLPERMS;
553 ip->i_mode |= (mode & ALLPERMS);
554 ip->i_flag |= IN_CHANGE;
555 return (0);
556 }
557
558 /*
559 * Perform chown operation on inode ip;
560 * inode must be locked prior to call.
561 */
562 static int
563 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
564 struct thread *td)
565 {
566 struct inode *ip = VTOI(vp);
567 uid_t ouid;
568 gid_t ogid;
569 int error = 0;
570
571 if (uid == (uid_t)VNOVAL)
572 uid = ip->i_uid;
573 if (gid == (gid_t)VNOVAL)
574 gid = ip->i_gid;
575 /*
576 * To modify the ownership of a file, must possess VADMIN
577 * for that file.
578 */
579 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
580 return (error);
581 /*
582 * To change the owner of a file, or change the group of a file
583 * to a group of which we are not a member, the caller must
584 * have privilege.
585 */
586 if (uid != ip->i_uid || (gid != ip->i_gid &&
587 !groupmember(gid, cred))) {
588 error = priv_check_cred(cred, PRIV_VFS_CHOWN);
589 if (error)
590 return (error);
591 }
592 ogid = ip->i_gid;
593 ouid = ip->i_uid;
594 ip->i_gid = gid;
595 ip->i_uid = uid;
596 ip->i_flag |= IN_CHANGE;
597 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
598 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0)
599 ip->i_mode &= ~(ISUID | ISGID);
600 }
601 return (0);
602 }
603
604 /*
605 * Synch an open file.
606 */
607 /* ARGSUSED */
608 static int
609 ext2_fsync(struct vop_fsync_args *ap)
610 {
611 /*
612 * Flush all dirty buffers associated with a vnode.
613 */
614
615 vop_stdfsync(ap);
616
617 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
618 }
619
620 static int
621 ext2_check_mknod_limits(dev_t dev)
622 {
623 unsigned maj = major(dev);
624 unsigned min = minor(dev);
625
626 if (maj > EXT2_MAJOR_MAX || min > EXT2_MINOR_MAX)
627 return (EINVAL);
628
629 return (0);
630 }
631
632 /*
633 * Mknod vnode call
634 */
635 /* ARGSUSED */
636 static int
637 ext2_mknod(struct vop_mknod_args *ap)
638 {
639 struct vattr *vap = ap->a_vap;
640 struct vnode **vpp = ap->a_vpp;
641 struct inode *ip;
642 ino_t ino;
643 int error;
644
645 if (vap->va_rdev != VNOVAL) {
646 error = ext2_check_mknod_limits(vap->va_rdev);
647 if (error)
648 return (error);
649 }
650
651 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
652 ap->a_dvp, vpp, ap->a_cnp);
653 if (error)
654 return (error);
655 ip = VTOI(*vpp);
656 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
657 if (vap->va_rdev != VNOVAL)
658 ip->i_rdev = vap->va_rdev;
659
660 /*
661 * Remove inode, then reload it through VFS_VGET so it is
662 * checked to see if it is an alias of an existing entry in
663 * the inode cache. XXX I don't believe this is necessary now.
664 */
665 (*vpp)->v_type = VNON;
666 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
667 vgone(*vpp);
668 vput(*vpp);
669 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
670 if (error) {
671 *vpp = NULL;
672 return (error);
673 }
674 return (0);
675 }
676
677 static int
678 ext2_remove(struct vop_remove_args *ap)
679 {
680 struct inode *ip;
681 struct vnode *vp = ap->a_vp;
682 struct vnode *dvp = ap->a_dvp;
683 int error;
684
685 ip = VTOI(vp);
686 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
687 (VTOI(dvp)->i_flags & APPEND)) {
688 error = EPERM;
689 goto out;
690 }
691 error = ext2_dirremove(dvp, ap->a_cnp);
692 if (error == 0) {
693 ip->i_nlink--;
694 ip->i_flag |= IN_CHANGE;
695 }
696 out:
697 return (error);
698 }
699
700 /*
701 * link vnode call
702 */
703 static int
704 ext2_link(struct vop_link_args *ap)
705 {
706 struct vnode *vp = ap->a_vp;
707 struct vnode *tdvp = ap->a_tdvp;
708 struct componentname *cnp = ap->a_cnp;
709 struct inode *ip;
710 int error;
711
712 ip = VTOI(vp);
713 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) {
714 error = EMLINK;
715 goto out;
716 }
717 if (ip->i_flags & (IMMUTABLE | APPEND)) {
718 error = EPERM;
719 goto out;
720 }
721 ip->i_nlink++;
722 ip->i_flag |= IN_CHANGE;
723 error = ext2_update(vp, !DOINGASYNC(vp));
724 if (!error)
725 error = ext2_direnter(ip, tdvp, cnp);
726 if (error) {
727 ip->i_nlink--;
728 ip->i_flag |= IN_CHANGE;
729 }
730 out:
731 return (error);
732 }
733
734 static int
735 ext2_inc_nlink(struct inode *ip)
736 {
737
738 ip->i_nlink++;
739
740 if (S_ISDIR(ip->i_mode) &&
741 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) &&
742 ip->i_nlink > 1) {
743 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2)
744 ip->i_nlink = 1;
745 } else if (ip->i_nlink > EXT4_LINK_MAX) {
746 ip->i_nlink--;
747 return (EMLINK);
748 }
749
750 return (0);
751 }
752
753 static void
754 ext2_dec_nlink(struct inode *ip)
755 {
756
757 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2)
758 ip->i_nlink--;
759 }
760
761 /*
762 * Rename system call.
763 * rename("foo", "bar");
764 * is essentially
765 * unlink("bar");
766 * link("foo", "bar");
767 * unlink("foo");
768 * but ``atomically''. Can't do full commit without saving state in the
769 * inode on disk which isn't feasible at this time. Best we can do is
770 * always guarantee the target exists.
771 *
772 * Basic algorithm is:
773 *
774 * 1) Bump link count on source while we're linking it to the
775 * target. This also ensure the inode won't be deleted out
776 * from underneath us while we work (it may be truncated by
777 * a concurrent `trunc' or `open' for creation).
778 * 2) Link source to destination. If destination already exists,
779 * delete it first.
780 * 3) Unlink source reference to inode if still around. If a
781 * directory was moved and the parent of the destination
782 * is different from the source, patch the ".." entry in the
783 * directory.
784 */
785 static int
786 ext2_rename(struct vop_rename_args *ap)
787 {
788 struct vnode *tvp = ap->a_tvp;
789 struct vnode *tdvp = ap->a_tdvp;
790 struct vnode *fvp = ap->a_fvp;
791 struct vnode *fdvp = ap->a_fdvp;
792 struct componentname *tcnp = ap->a_tcnp;
793 struct componentname *fcnp = ap->a_fcnp;
794 struct inode *ip, *xp, *dp;
795 struct dirtemplate *dirbuf;
796 int doingdirectory = 0, oldparent = 0, newparent = 0;
797 int error = 0;
798 u_char namlen;
799
800 /*
801 * Check for cross-device rename.
802 */
803 if ((fvp->v_mount != tdvp->v_mount) ||
804 (tvp && (fvp->v_mount != tvp->v_mount))) {
805 error = EXDEV;
806 abortit:
807 if (tdvp == tvp)
808 vrele(tdvp);
809 else
810 vput(tdvp);
811 if (tvp)
812 vput(tvp);
813 vrele(fdvp);
814 vrele(fvp);
815 return (error);
816 }
817
818 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
819 (VTOI(tdvp)->i_flags & APPEND))) {
820 error = EPERM;
821 goto abortit;
822 }
823
824 /*
825 * Renaming a file to itself has no effect. The upper layers should
826 * not call us in that case. Temporarily just warn if they do.
827 */
828 if (fvp == tvp) {
829 SDT_PROBE2(ext2fs, , vnops, trace, 1,
830 "rename: fvp == tvp (can't happen)");
831 error = 0;
832 goto abortit;
833 }
834
835 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
836 goto abortit;
837 dp = VTOI(fdvp);
838 ip = VTOI(fvp);
839 if (ip->i_nlink >= EXT4_LINK_MAX &&
840 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
841 VOP_UNLOCK(fvp);
842 error = EMLINK;
843 goto abortit;
844 }
845 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
846 || (dp->i_flags & APPEND)) {
847 VOP_UNLOCK(fvp);
848 error = EPERM;
849 goto abortit;
850 }
851 if ((ip->i_mode & IFMT) == IFDIR) {
852 /*
853 * Avoid ".", "..", and aliases of "." for obvious reasons.
854 */
855 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
856 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
857 (ip->i_flag & IN_RENAME)) {
858 VOP_UNLOCK(fvp);
859 error = EINVAL;
860 goto abortit;
861 }
862 ip->i_flag |= IN_RENAME;
863 oldparent = dp->i_number;
864 doingdirectory++;
865 }
866 vrele(fdvp);
867
868 /*
869 * When the target exists, both the directory
870 * and target vnodes are returned locked.
871 */
872 dp = VTOI(tdvp);
873 xp = NULL;
874 if (tvp)
875 xp = VTOI(tvp);
876
877 /*
878 * 1) Bump link count while we're moving stuff
879 * around. If we crash somewhere before
880 * completing our work, the link count
881 * may be wrong, but correctable.
882 */
883 ext2_inc_nlink(ip);
884 ip->i_flag |= IN_CHANGE;
885 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
886 VOP_UNLOCK(fvp);
887 goto bad;
888 }
889
890 /*
891 * If ".." must be changed (ie the directory gets a new
892 * parent) then the source directory must not be in the
893 * directory hierarchy above the target, as this would
894 * orphan everything below the source directory. Also
895 * the user must have write permission in the source so
896 * as to be able to change "..". We must repeat the call
897 * to namei, as the parent directory is unlocked by the
898 * call to checkpath().
899 */
900 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread);
901 VOP_UNLOCK(fvp);
902 if (oldparent != dp->i_number)
903 newparent = dp->i_number;
904 if (doingdirectory && newparent) {
905 if (error) /* write access check above */
906 goto bad;
907 if (xp != NULL)
908 vput(tvp);
909 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
910 if (error)
911 goto out;
912 VREF(tdvp);
913 error = vfs_relookup(tdvp, &tvp, tcnp, true);
914 if (error)
915 goto out;
916 vrele(tdvp);
917 dp = VTOI(tdvp);
918 xp = NULL;
919 if (tvp)
920 xp = VTOI(tvp);
921 }
922 /*
923 * 2) If target doesn't exist, link the target
924 * to the source and unlink the source.
925 * Otherwise, rewrite the target directory
926 * entry to reference the source inode and
927 * expunge the original entry's existence.
928 */
929 if (xp == NULL) {
930 if (dp->i_devvp != ip->i_devvp)
931 panic("ext2_rename: EXDEV");
932 /*
933 * Account for ".." in new directory.
934 * When source and destination have the same
935 * parent we don't fool with the link count.
936 */
937 if (doingdirectory && newparent) {
938 error = ext2_inc_nlink(dp);
939 if (error)
940 goto bad;
941
942 dp->i_flag |= IN_CHANGE;
943 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
944 if (error)
945 goto bad;
946 }
947 error = ext2_direnter(ip, tdvp, tcnp);
948 if (error) {
949 if (doingdirectory && newparent) {
950 ext2_dec_nlink(dp);
951 dp->i_flag |= IN_CHANGE;
952 (void)ext2_update(tdvp, 1);
953 }
954 goto bad;
955 }
956 vput(tdvp);
957 } else {
958 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
959 panic("ext2_rename: EXDEV");
960 /*
961 * Short circuit rename(foo, foo).
962 */
963 if (xp->i_number == ip->i_number)
964 panic("ext2_rename: same file");
965 /*
966 * If the parent directory is "sticky", then the user must
967 * own the parent directory, or the destination of the rename,
968 * otherwise the destination may not be changed (except by
969 * root). This implements append-only directories.
970 */
971 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
972 tcnp->cn_cred->cr_uid != dp->i_uid &&
973 xp->i_uid != tcnp->cn_cred->cr_uid) {
974 error = EPERM;
975 goto bad;
976 }
977 /*
978 * Target must be empty if a directory and have no links
979 * to it. Also, ensure source and target are compatible
980 * (both directories, or both not directories).
981 */
982 if ((xp->i_mode & IFMT) == IFDIR) {
983 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
984 error = ENOTEMPTY;
985 goto bad;
986 }
987 if (!doingdirectory) {
988 error = ENOTDIR;
989 goto bad;
990 }
991 cache_purge(tdvp);
992 } else if (doingdirectory) {
993 error = EISDIR;
994 goto bad;
995 }
996 error = ext2_dirrewrite(dp, ip, tcnp);
997 if (error)
998 goto bad;
999 /*
1000 * If the target directory is in the same
1001 * directory as the source directory,
1002 * decrement the link count on the parent
1003 * of the target directory.
1004 */
1005 if (doingdirectory && !newparent) {
1006 ext2_dec_nlink(dp);
1007 dp->i_flag |= IN_CHANGE;
1008 }
1009 vput(tdvp);
1010 /*
1011 * Adjust the link count of the target to
1012 * reflect the dirrewrite above. If this is
1013 * a directory it is empty and there are
1014 * no links to it, so we can squash the inode and
1015 * any space associated with it. We disallowed
1016 * renaming over top of a directory with links to
1017 * it above, as the remaining link would point to
1018 * a directory without "." or ".." entries.
1019 */
1020 ext2_dec_nlink(xp);
1021 if (doingdirectory) {
1022 if (xp->i_nlink > 2)
1023 panic("ext2_rename: linked directory");
1024 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
1025 tcnp->cn_cred, curthread);
1026 xp->i_nlink = 0;
1027 }
1028 xp->i_flag |= IN_CHANGE;
1029 vput(tvp);
1030 xp = NULL;
1031 }
1032
1033 /*
1034 * 3) Unlink the source.
1035 */
1036 fcnp->cn_flags &= ~MODMASK;
1037 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1038 VREF(fdvp);
1039 error = vfs_relookup(fdvp, &fvp, fcnp, true);
1040 if (error == 0)
1041 vrele(fdvp);
1042 if (fvp != NULL) {
1043 xp = VTOI(fvp);
1044 dp = VTOI(fdvp);
1045 } else {
1046 /*
1047 * From name has disappeared. IN_RENAME is not sufficient
1048 * to protect against directory races due to timing windows,
1049 * so we can't panic here.
1050 */
1051 vrele(ap->a_fvp);
1052 return (0);
1053 }
1054 /*
1055 * Ensure that the directory entry still exists and has not
1056 * changed while the new name has been entered. If the source is
1057 * a file then the entry may have been unlinked or renamed. In
1058 * either case there is no further work to be done. If the source
1059 * is a directory then it cannot have been rmdir'ed; its link
1060 * count of three would cause a rmdir to fail with ENOTEMPTY.
1061 * The IN_RENAME flag ensures that it cannot be moved by another
1062 * rename.
1063 */
1064 if (xp != ip) {
1065 /*
1066 * From name resolves to a different inode. IN_RENAME is
1067 * not sufficient protection against timing window races
1068 * so we can't panic here.
1069 */
1070 } else {
1071 /*
1072 * If the source is a directory with a
1073 * new parent, the link count of the old
1074 * parent directory must be decremented
1075 * and ".." set to point to the new parent.
1076 */
1077 if (doingdirectory && newparent) {
1078 ext2_dec_nlink(dp);
1079 dp->i_flag |= IN_CHANGE;
1080 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO);
1081 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf,
1082 ip->i_e2fs->e2fs_bsize, (off_t)0,
1083 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1084 tcnp->cn_cred, NOCRED, NULL, NULL);
1085 if (error == 0) {
1086 /* Like ufs little-endian: */
1087 namlen = dirbuf->dotdot_type;
1088 if (namlen != 2 ||
1089 dirbuf->dotdot_name[0] != '.' ||
1090 dirbuf->dotdot_name[1] != '.') {
1091 ext2_dirbad(xp, (doff_t)12,
1092 "rename: mangled dir");
1093 } else {
1094 dirbuf->dotdot_ino = htole32(newparent);
1095 /*
1096 * dirblock 0 could be htree root,
1097 * try both csum update functions.
1098 */
1099 ext2_dirent_csum_set(ip,
1100 (struct ext2fs_direct_2 *)dirbuf);
1101 ext2_dx_csum_set(ip,
1102 (struct ext2fs_direct_2 *)dirbuf);
1103 (void)vn_rdwr(UIO_WRITE, fvp,
1104 (caddr_t)dirbuf,
1105 ip->i_e2fs->e2fs_bsize,
1106 (off_t)0, UIO_SYSSPACE,
1107 IO_NODELOCKED | IO_SYNC |
1108 IO_NOMACCHECK, tcnp->cn_cred,
1109 NOCRED, NULL, NULL);
1110 cache_purge(fdvp);
1111 }
1112 }
1113 free(dirbuf, M_TEMP);
1114 }
1115 error = ext2_dirremove(fdvp, fcnp);
1116 if (!error) {
1117 ext2_dec_nlink(xp);
1118 xp->i_flag |= IN_CHANGE;
1119 }
1120 xp->i_flag &= ~IN_RENAME;
1121 }
1122 if (dp)
1123 vput(fdvp);
1124 if (xp)
1125 vput(fvp);
1126 vrele(ap->a_fvp);
1127 return (error);
1128
1129 bad:
1130 if (xp)
1131 vput(ITOV(xp));
1132 vput(ITOV(dp));
1133 out:
1134 if (doingdirectory)
1135 ip->i_flag &= ~IN_RENAME;
1136 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1137 ext2_dec_nlink(ip);
1138 ip->i_flag |= IN_CHANGE;
1139 ip->i_flag &= ~IN_RENAME;
1140 vput(fvp);
1141 } else
1142 vrele(fvp);
1143 return (error);
1144 }
1145
1146 #ifdef UFS_ACL
1147 static int
1148 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
1149 mode_t dmode, struct ucred *cred, struct thread *td)
1150 {
1151 int error;
1152 struct inode *ip = VTOI(tvp);
1153 struct acl *dacl, *acl;
1154
1155 acl = acl_alloc(M_WAITOK);
1156 dacl = acl_alloc(M_WAITOK);
1157
1158 /*
1159 * Retrieve default ACL from parent, if any.
1160 */
1161 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1162 switch (error) {
1163 case 0:
1164 /*
1165 * Retrieved a default ACL, so merge mode and ACL if
1166 * necessary. If the ACL is empty, fall through to
1167 * the "not defined or available" case.
1168 */
1169 if (acl->acl_cnt != 0) {
1170 dmode = acl_posix1e_newfilemode(dmode, acl);
1171 ip->i_mode = dmode;
1172 *dacl = *acl;
1173 ext2_sync_acl_from_inode(ip, acl);
1174 break;
1175 }
1176 /* FALLTHROUGH */
1177
1178 case EOPNOTSUPP:
1179 /*
1180 * Just use the mode as-is.
1181 */
1182 ip->i_mode = dmode;
1183 error = 0;
1184 goto out;
1185
1186 default:
1187 goto out;
1188 }
1189
1190 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1191 if (error == 0)
1192 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
1193 switch (error) {
1194 case 0:
1195 break;
1196
1197 case EOPNOTSUPP:
1198 /*
1199 * XXX: This should not happen, as EOPNOTSUPP above
1200 * was supposed to free acl.
1201 */
1202 #ifdef DEBUG
1203 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
1204 #endif /* DEBUG */
1205 break;
1206
1207 default:
1208 goto out;
1209 }
1210
1211 out:
1212 acl_free(acl);
1213 acl_free(dacl);
1214
1215 return (error);
1216 }
1217
1218 static int
1219 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
1220 mode_t mode, struct ucred *cred, struct thread *td)
1221 {
1222 int error;
1223 struct inode *ip = VTOI(tvp);
1224 struct acl *acl;
1225
1226 acl = acl_alloc(M_WAITOK);
1227
1228 /*
1229 * Retrieve default ACL for parent, if any.
1230 */
1231 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1232 switch (error) {
1233 case 0:
1234 /*
1235 * Retrieved a default ACL, so merge mode and ACL if
1236 * necessary.
1237 */
1238 if (acl->acl_cnt != 0) {
1239 /*
1240 * Two possible ways for default ACL to not
1241 * be present. First, the EA can be
1242 * undefined, or second, the default ACL can
1243 * be blank. If it's blank, fall through to
1244 * the it's not defined case.
1245 */
1246 mode = acl_posix1e_newfilemode(mode, acl);
1247 ip->i_mode = mode;
1248 ext2_sync_acl_from_inode(ip, acl);
1249 break;
1250 }
1251 /* FALLTHROUGH */
1252
1253 case EOPNOTSUPP:
1254 /*
1255 * Just use the mode as-is.
1256 */
1257 ip->i_mode = mode;
1258 error = 0;
1259 goto out;
1260
1261 default:
1262 goto out;
1263 }
1264
1265 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1266 switch (error) {
1267 case 0:
1268 break;
1269
1270 case EOPNOTSUPP:
1271 /*
1272 * XXX: This should not happen, as EOPNOTSUPP above was
1273 * supposed to free acl.
1274 */
1275 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1276 "but no VOP_SETACL()\n");
1277 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1278 "but no VOP_SETACL()"); */
1279 break;
1280
1281 default:
1282 goto out;
1283 }
1284
1285 out:
1286 acl_free(acl);
1287
1288 return (error);
1289 }
1290
1291 #endif /* UFS_ACL */
1292
1293 /*
1294 * Mkdir system call
1295 */
1296 static int
1297 ext2_mkdir(struct vop_mkdir_args *ap)
1298 {
1299 struct m_ext2fs *fs;
1300 struct vnode *dvp = ap->a_dvp;
1301 struct vattr *vap = ap->a_vap;
1302 struct componentname *cnp = ap->a_cnp;
1303 struct inode *ip, *dp;
1304 struct vnode *tvp;
1305 struct dirtemplate dirtemplate, *dtp;
1306 char *buf = NULL;
1307 int error, dmode;
1308
1309 dp = VTOI(dvp);
1310 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX &&
1311 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
1312 error = EMLINK;
1313 goto out;
1314 }
1315 dmode = vap->va_mode & 0777;
1316 dmode |= IFDIR;
1317 /*
1318 * Must simulate part of ext2_makeinode here to acquire the inode,
1319 * but not have it entered in the parent directory. The entry is
1320 * made later after writing "." and ".." entries.
1321 */
1322 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1323 if (error)
1324 goto out;
1325 ip = VTOI(tvp);
1326 fs = ip->i_e2fs;
1327 ip->i_gid = dp->i_gid;
1328 #ifdef SUIDDIR
1329 {
1330 /*
1331 * if we are hacking owners here, (only do this where told to)
1332 * and we are not giving it TOO root, (would subvert quotas)
1333 * then go ahead and give it to the other user.
1334 * The new directory also inherits the SUID bit.
1335 * If user's UID and dir UID are the same,
1336 * 'give it away' so that the SUID is still forced on.
1337 */
1338 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1339 (dp->i_mode & ISUID) && dp->i_uid) {
1340 dmode |= ISUID;
1341 ip->i_uid = dp->i_uid;
1342 } else {
1343 ip->i_uid = cnp->cn_cred->cr_uid;
1344 }
1345 }
1346 #else
1347 ip->i_uid = cnp->cn_cred->cr_uid;
1348 #endif
1349 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1350 ip->i_mode = dmode;
1351 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1352 ip->i_nlink = 2;
1353 if (cnp->cn_flags & ISWHITEOUT)
1354 ip->i_flags |= UF_OPAQUE;
1355 error = ext2_update(tvp, 1);
1356
1357 /*
1358 * Bump link count in parent directory
1359 * to reflect work done below. Should
1360 * be done before reference is created
1361 * so reparation is possible if we crash.
1362 */
1363 ext2_inc_nlink(dp);
1364 dp->i_flag |= IN_CHANGE;
1365 error = ext2_update(dvp, !DOINGASYNC(dvp));
1366 if (error)
1367 goto bad;
1368
1369 /* Initialize directory with "." and ".." from static template. */
1370 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1371 EXT2F_INCOMPAT_FTYPE))
1372 dtp = &mastertemplate;
1373 else
1374 dtp = &omastertemplate;
1375 dirtemplate = *dtp;
1376 dirtemplate.dot_ino = htole32(ip->i_number);
1377 dirtemplate.dotdot_ino = htole32(dp->i_number);
1378 /*
1379 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
1380 * just redefine it - for this function only
1381 */
1382 #undef DIRBLKSIZ
1383 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1384 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12);
1385 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO);
1386 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
1387 dirtemplate.dotdot_reclen =
1388 htole16(le16toh(dirtemplate.dotdot_reclen) -
1389 sizeof(struct ext2fs_direct_tail));
1390 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ));
1391 }
1392 memcpy(buf, &dirtemplate, sizeof(dirtemplate));
1393 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf);
1394 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf,
1395 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE,
1396 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1397 NULL, NULL);
1398 if (error) {
1399 ext2_dec_nlink(dp);
1400 dp->i_flag |= IN_CHANGE;
1401 goto bad;
1402 }
1403 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1404 /* XXX should grow with balloc() */
1405 panic("ext2_mkdir: blksize");
1406 else {
1407 ip->i_size = DIRBLKSIZ;
1408 ip->i_flag |= IN_CHANGE;
1409 }
1410
1411 #ifdef UFS_ACL
1412 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1413 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
1414 cnp->cn_cred, curthread);
1415 if (error)
1416 goto bad;
1417 }
1418
1419 #endif /* UFS_ACL */
1420
1421 /* Directory set up, now install its entry in the parent directory. */
1422 error = ext2_direnter(ip, dvp, cnp);
1423 if (error) {
1424 ext2_dec_nlink(dp);
1425 dp->i_flag |= IN_CHANGE;
1426 }
1427 bad:
1428 /*
1429 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1430 * for us because we set the link count to 0.
1431 */
1432 if (error) {
1433 ip->i_nlink = 0;
1434 ip->i_flag |= IN_CHANGE;
1435 vput(tvp);
1436 } else
1437 *ap->a_vpp = tvp;
1438 out:
1439 free(buf, M_TEMP);
1440 return (error);
1441 #undef DIRBLKSIZ
1442 #define DIRBLKSIZ DEV_BSIZE
1443 }
1444
1445 /*
1446 * Rmdir system call.
1447 */
1448 static int
1449 ext2_rmdir(struct vop_rmdir_args *ap)
1450 {
1451 struct vnode *vp = ap->a_vp;
1452 struct vnode *dvp = ap->a_dvp;
1453 struct componentname *cnp = ap->a_cnp;
1454 struct inode *ip, *dp;
1455 int error;
1456
1457 ip = VTOI(vp);
1458 dp = VTOI(dvp);
1459
1460 /*
1461 * Verify the directory is empty (and valid).
1462 * (Rmdir ".." won't be valid since
1463 * ".." will contain a reference to
1464 * the current directory and thus be
1465 * non-empty.)
1466 */
1467 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1468 error = ENOTEMPTY;
1469 goto out;
1470 }
1471 if ((dp->i_flags & APPEND)
1472 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1473 error = EPERM;
1474 goto out;
1475 }
1476 /*
1477 * Delete reference to directory before purging
1478 * inode. If we crash in between, the directory
1479 * will be reattached to lost+found,
1480 */
1481 error = ext2_dirremove(dvp, cnp);
1482 if (error)
1483 goto out;
1484 ext2_dec_nlink(dp);
1485 dp->i_flag |= IN_CHANGE;
1486 cache_purge(dvp);
1487 VOP_UNLOCK(dvp);
1488 /*
1489 * Truncate inode. The only stuff left
1490 * in the directory is "." and "..".
1491 */
1492 ip->i_nlink = 0;
1493 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1494 curthread);
1495 cache_purge(ITOV(ip));
1496 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1497 VOP_UNLOCK(vp);
1498 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1499 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1500 }
1501 out:
1502 return (error);
1503 }
1504
1505 /*
1506 * symlink -- make a symbolic link
1507 */
1508 static int
1509 ext2_symlink(struct vop_symlink_args *ap)
1510 {
1511 struct vnode *vp, **vpp = ap->a_vpp;
1512 struct inode *ip;
1513 int len, error;
1514
1515 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1516 vpp, ap->a_cnp);
1517 if (error)
1518 return (error);
1519 vp = *vpp;
1520 len = strlen(ap->a_target);
1521 if (len < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) {
1522 ip = VTOI(vp);
1523 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1524 ip->i_size = len;
1525 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1526 } else
1527 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target),
1528 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1529 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1530 if (error)
1531 vput(vp);
1532 return (error);
1533 }
1534
1535 /*
1536 * Return target name of a symbolic link
1537 */
1538 static int
1539 ext2_readlink(struct vop_readlink_args *ap)
1540 {
1541 struct vnode *vp = ap->a_vp;
1542 struct inode *ip = VTOI(vp);
1543 int isize;
1544
1545 isize = ip->i_size;
1546 if (isize < VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen) {
1547 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1548 return (0);
1549 }
1550 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1551 }
1552
1553 /*
1554 * Calculate the logical to physical mapping if not done already,
1555 * then call the device strategy routine.
1556 *
1557 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1558 * deadlock on memory. See ext2_bmap() for details.
1559 */
1560 static int
1561 ext2_strategy(struct vop_strategy_args *ap)
1562 {
1563 struct buf *bp = ap->a_bp;
1564 struct vnode *vp = ap->a_vp;
1565 struct bufobj *bo;
1566 daddr_t blkno;
1567 int error;
1568
1569 if (vp->v_type == VBLK || vp->v_type == VCHR)
1570 panic("ext2_strategy: spec");
1571 if (bp->b_blkno == bp->b_lblkno) {
1572 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS)
1573 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL);
1574 else
1575 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1576
1577 bp->b_blkno = blkno;
1578 if (error) {
1579 bp->b_error = error;
1580 bp->b_ioflags |= BIO_ERROR;
1581 bufdone(bp);
1582 return (0);
1583 }
1584 if ((long)bp->b_blkno == -1)
1585 vfs_bio_clrbuf(bp);
1586 }
1587 if ((long)bp->b_blkno == -1) {
1588 bufdone(bp);
1589 return (0);
1590 }
1591 bp->b_iooffset = dbtob(bp->b_blkno);
1592 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1593 BO_STRATEGY(bo, bp);
1594 return (0);
1595 }
1596
1597 /*
1598 * Print out the contents of an inode.
1599 */
1600 static int
1601 ext2_print(struct vop_print_args *ap)
1602 {
1603 struct vnode *vp = ap->a_vp;
1604 struct inode *ip = VTOI(vp);
1605
1606 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
1607 if (vp->v_type == VFIFO)
1608 fifo_printinfo(vp);
1609 printf("\n");
1610 return (0);
1611 }
1612
1613 /*
1614 * Close wrapper for fifos.
1615 *
1616 * Update the times on the inode then do device close.
1617 */
1618 static int
1619 ext2fifo_close(struct vop_close_args *ap)
1620 {
1621 struct vnode *vp = ap->a_vp;
1622
1623 VI_LOCK(vp);
1624 if (vp->v_usecount > 1)
1625 ext2_itimes_locked(vp);
1626 VI_UNLOCK(vp);
1627 return (fifo_specops.vop_close(ap));
1628 }
1629
1630 /*
1631 * Return POSIX pathconf information applicable to ext2 filesystems.
1632 */
1633 static int
1634 ext2_pathconf(struct vop_pathconf_args *ap)
1635 {
1636 int error = 0;
1637
1638 switch (ap->a_name) {
1639 case _PC_LINK_MAX:
1640 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs,
1641 EXT2F_ROCOMPAT_DIR_NLINK))
1642 *ap->a_retval = INT_MAX;
1643 else
1644 *ap->a_retval = EXT4_LINK_MAX;
1645 break;
1646 case _PC_NAME_MAX:
1647 *ap->a_retval = NAME_MAX;
1648 break;
1649 case _PC_PIPE_BUF:
1650 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
1651 *ap->a_retval = PIPE_BUF;
1652 else
1653 error = EINVAL;
1654 break;
1655 case _PC_CHOWN_RESTRICTED:
1656 *ap->a_retval = 1;
1657 break;
1658 case _PC_NO_TRUNC:
1659 *ap->a_retval = 1;
1660 break;
1661
1662 #ifdef UFS_ACL
1663 case _PC_ACL_EXTENDED:
1664 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1665 *ap->a_retval = 1;
1666 else
1667 *ap->a_retval = 0;
1668 break;
1669 case _PC_ACL_PATH_MAX:
1670 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1671 *ap->a_retval = ACL_MAX_ENTRIES;
1672 else
1673 *ap->a_retval = 3;
1674 break;
1675 #endif /* UFS_ACL */
1676
1677 case _PC_MIN_HOLE_SIZE:
1678 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1679 break;
1680 case _PC_PRIO_IO:
1681 *ap->a_retval = 0;
1682 break;
1683 case _PC_SYNC_IO:
1684 *ap->a_retval = 0;
1685 break;
1686 case _PC_ALLOC_SIZE_MIN:
1687 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1688 break;
1689 case _PC_FILESIZEBITS:
1690 *ap->a_retval = 64;
1691 break;
1692 case _PC_REC_INCR_XFER_SIZE:
1693 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1694 break;
1695 case _PC_REC_MAX_XFER_SIZE:
1696 *ap->a_retval = -1; /* means ``unlimited'' */
1697 break;
1698 case _PC_REC_MIN_XFER_SIZE:
1699 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1700 break;
1701 case _PC_REC_XFER_ALIGN:
1702 *ap->a_retval = PAGE_SIZE;
1703 break;
1704 case _PC_SYMLINK_MAX:
1705 *ap->a_retval = MAXPATHLEN;
1706 break;
1707
1708 default:
1709 error = vop_stdpathconf(ap);
1710 break;
1711 }
1712 return (error);
1713 }
1714
1715 /*
1716 * Vnode operation to remove a named attribute.
1717 */
1718 static int
1719 ext2_deleteextattr(struct vop_deleteextattr_args *ap)
1720 {
1721 struct inode *ip;
1722 struct m_ext2fs *fs;
1723 int error;
1724
1725 ip = VTOI(ap->a_vp);
1726 fs = ip->i_e2fs;
1727
1728 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1729 return (EOPNOTSUPP);
1730
1731 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1732 return (EOPNOTSUPP);
1733
1734 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1735 ap->a_cred, ap->a_td, VWRITE);
1736 if (error)
1737 return (error);
1738
1739 error = ENOATTR;
1740
1741 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1742 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name);
1743 if (error != ENOATTR)
1744 return (error);
1745 }
1746
1747 if (ip->i_facl)
1748 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name);
1749
1750 return (error);
1751 }
1752
1753 /*
1754 * Vnode operation to retrieve a named extended attribute.
1755 */
1756 static int
1757 ext2_getextattr(struct vop_getextattr_args *ap)
1758 {
1759 struct inode *ip;
1760 struct m_ext2fs *fs;
1761 int error;
1762
1763 ip = VTOI(ap->a_vp);
1764 fs = ip->i_e2fs;
1765
1766 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1767 return (EOPNOTSUPP);
1768
1769 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1770 return (EOPNOTSUPP);
1771
1772 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1773 ap->a_cred, ap->a_td, VREAD);
1774 if (error)
1775 return (error);
1776
1777 if (ap->a_size != NULL)
1778 *ap->a_size = 0;
1779
1780 error = ENOATTR;
1781
1782 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1783 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace,
1784 ap->a_name, ap->a_uio, ap->a_size);
1785 if (error != ENOATTR)
1786 return (error);
1787 }
1788
1789 if (ip->i_facl)
1790 error = ext2_extattr_block_get(ip, ap->a_attrnamespace,
1791 ap->a_name, ap->a_uio, ap->a_size);
1792
1793 return (error);
1794 }
1795
1796 /*
1797 * Vnode operation to retrieve extended attributes on a vnode.
1798 */
1799 static int
1800 ext2_listextattr(struct vop_listextattr_args *ap)
1801 {
1802 struct inode *ip;
1803 struct m_ext2fs *fs;
1804 int error;
1805
1806 ip = VTOI(ap->a_vp);
1807 fs = ip->i_e2fs;
1808
1809 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1810 return (EOPNOTSUPP);
1811
1812 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1813 return (EOPNOTSUPP);
1814
1815 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1816 ap->a_cred, ap->a_td, VREAD);
1817 if (error)
1818 return (error);
1819
1820 if (ap->a_size != NULL)
1821 *ap->a_size = 0;
1822
1823 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1824 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace,
1825 ap->a_uio, ap->a_size);
1826 if (error)
1827 return (error);
1828 }
1829
1830 if (ip->i_facl)
1831 error = ext2_extattr_block_list(ip, ap->a_attrnamespace,
1832 ap->a_uio, ap->a_size);
1833
1834 return (error);
1835 }
1836
1837 /*
1838 * Vnode operation to set a named attribute.
1839 */
1840 static int
1841 ext2_setextattr(struct vop_setextattr_args *ap)
1842 {
1843 struct inode *ip;
1844 struct m_ext2fs *fs;
1845 int error;
1846
1847 ip = VTOI(ap->a_vp);
1848 fs = ip->i_e2fs;
1849
1850 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1851 return (EOPNOTSUPP);
1852
1853 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1854 return (EOPNOTSUPP);
1855
1856 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1857 ap->a_cred, ap->a_td, VWRITE);
1858 if (error)
1859 return (error);
1860
1861 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name);
1862 if (error)
1863 return (error);
1864
1865 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1866 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace,
1867 ap->a_name, ap->a_uio);
1868 if (error != ENOSPC)
1869 return (error);
1870 }
1871
1872 error = ext2_extattr_block_set(ip, ap->a_attrnamespace,
1873 ap->a_name, ap->a_uio);
1874
1875 return (error);
1876 }
1877
1878 /*
1879 * Vnode pointer to File handle
1880 */
1881 /* ARGSUSED */
1882 static int
1883 ext2_vptofh(struct vop_vptofh_args *ap)
1884 {
1885 struct inode *ip;
1886 struct ufid *ufhp;
1887
1888 ip = VTOI(ap->a_vp);
1889 ufhp = (struct ufid *)ap->a_fhp;
1890 ufhp->ufid_len = sizeof(struct ufid);
1891 ufhp->ufid_ino = ip->i_number;
1892 ufhp->ufid_gen = ip->i_gen;
1893 return (0);
1894 }
1895
1896 /*
1897 * Initialize the vnode associated with a new inode, handle aliased
1898 * vnodes.
1899 */
1900 int
1901 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1902 {
1903 struct inode *ip;
1904 struct vnode *vp;
1905
1906 vp = *vpp;
1907 ip = VTOI(vp);
1908 vp->v_type = IFTOVT(ip->i_mode);
1909 /*
1910 * Only unallocated inodes should be of type VNON.
1911 */
1912 if (ip->i_mode != 0 && vp->v_type == VNON)
1913 return (EINVAL);
1914 if (vp->v_type == VFIFO)
1915 vp->v_op = fifoops;
1916
1917 if (ip->i_number == EXT2_ROOTINO)
1918 vp->v_vflag |= VV_ROOT;
1919 ip->i_modrev = init_va_filerev();
1920 *vpp = vp;
1921 return (0);
1922 }
1923
1924 /*
1925 * Allocate a new inode.
1926 */
1927 static int
1928 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1929 struct componentname *cnp)
1930 {
1931 struct inode *ip, *pdir;
1932 struct vnode *tvp;
1933 int error;
1934
1935 pdir = VTOI(dvp);
1936 *vpp = NULL;
1937 if ((mode & IFMT) == 0)
1938 mode |= IFREG;
1939
1940 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1941 if (error) {
1942 return (error);
1943 }
1944 ip = VTOI(tvp);
1945 ip->i_gid = pdir->i_gid;
1946 #ifdef SUIDDIR
1947 {
1948 /*
1949 * if we are
1950 * not the owner of the directory,
1951 * and we are hacking owners here, (only do this where told to)
1952 * and we are not giving it TOO root, (would subvert quotas)
1953 * then go ahead and give it to the other user.
1954 * Note that this drops off the execute bits for security.
1955 */
1956 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1957 (pdir->i_mode & ISUID) &&
1958 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1959 ip->i_uid = pdir->i_uid;
1960 mode &= ~07111;
1961 } else {
1962 ip->i_uid = cnp->cn_cred->cr_uid;
1963 }
1964 }
1965 #else
1966 ip->i_uid = cnp->cn_cred->cr_uid;
1967 #endif
1968 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1969 ip->i_mode = mode;
1970 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1971 ip->i_nlink = 1;
1972 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1973 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID))
1974 ip->i_mode &= ~ISGID;
1975 }
1976
1977 if (cnp->cn_flags & ISWHITEOUT)
1978 ip->i_flags |= UF_OPAQUE;
1979
1980 /*
1981 * Make sure inode goes to disk before directory entry.
1982 */
1983 error = ext2_update(tvp, !DOINGASYNC(tvp));
1984 if (error)
1985 goto bad;
1986
1987 #ifdef UFS_ACL
1988 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1989 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
1990 cnp->cn_cred, curthread);
1991 if (error)
1992 goto bad;
1993 }
1994 #endif /* UFS_ACL */
1995
1996 error = ext2_direnter(ip, dvp, cnp);
1997 if (error)
1998 goto bad;
1999
2000 *vpp = tvp;
2001 return (0);
2002
2003 bad:
2004 /*
2005 * Write error occurred trying to update the inode
2006 * or the directory so must deallocate the inode.
2007 */
2008 ip->i_nlink = 0;
2009 ip->i_flag |= IN_CHANGE;
2010 vput(tvp);
2011 return (error);
2012 }
2013
2014 /*
2015 * Vnode op for reading.
2016 */
2017 static int
2018 ext2_read(struct vop_read_args *ap)
2019 {
2020 struct vnode *vp;
2021 struct inode *ip;
2022 struct uio *uio;
2023 struct m_ext2fs *fs;
2024 struct buf *bp;
2025 daddr_t lbn, nextlbn;
2026 off_t bytesinfile;
2027 long size, xfersize, blkoffset;
2028 int error, orig_resid, seqcount;
2029 int ioflag;
2030
2031 vp = ap->a_vp;
2032 uio = ap->a_uio;
2033 ioflag = ap->a_ioflag;
2034
2035 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
2036 ip = VTOI(vp);
2037
2038 #ifdef INVARIANTS
2039 if (uio->uio_rw != UIO_READ)
2040 panic("%s: mode", "ext2_read");
2041
2042 if (vp->v_type == VLNK) {
2043 if ((int)ip->i_size <
2044 VFSTOEXT2(vp->v_mount)->um_e2fs->e2fs_maxsymlinklen)
2045 panic("%s: short symlink", "ext2_read");
2046 } else if (vp->v_type != VREG && vp->v_type != VDIR)
2047 panic("%s: type %d", "ext2_read", vp->v_type);
2048 #endif
2049 orig_resid = uio->uio_resid;
2050 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
2051 if (orig_resid == 0)
2052 return (0);
2053 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
2054 fs = ip->i_e2fs;
2055 if (uio->uio_offset < ip->i_size &&
2056 uio->uio_offset >= fs->e2fs_maxfilesize)
2057 return (EOVERFLOW);
2058
2059 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
2060 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
2061 break;
2062 lbn = lblkno(fs, uio->uio_offset);
2063 nextlbn = lbn + 1;
2064 size = blksize(fs, ip, lbn);
2065 blkoffset = blkoff(fs, uio->uio_offset);
2066
2067 xfersize = fs->e2fs_fsize - blkoffset;
2068 if (uio->uio_resid < xfersize)
2069 xfersize = uio->uio_resid;
2070 if (bytesinfile < xfersize)
2071 xfersize = bytesinfile;
2072
2073 if (lblktosize(fs, nextlbn) >= ip->i_size)
2074 error = bread(vp, lbn, size, NOCRED, &bp);
2075 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
2076 error = cluster_read(vp, ip->i_size, lbn, size,
2077 NOCRED, blkoffset + uio->uio_resid, seqcount,
2078 0, &bp);
2079 } else if (seqcount > 1) {
2080 u_int nextsize = blksize(fs, ip, nextlbn);
2081
2082 error = breadn(vp, lbn,
2083 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
2084 } else
2085 error = bread(vp, lbn, size, NOCRED, &bp);
2086 if (error) {
2087 brelse(bp);
2088 bp = NULL;
2089 break;
2090 }
2091
2092 /*
2093 * We should only get non-zero b_resid when an I/O error
2094 * has occurred, which should cause us to break above.
2095 * However, if the short read did not cause an error,
2096 * then we want to ensure that we do not uiomove bad
2097 * or uninitialized data.
2098 */
2099 size -= bp->b_resid;
2100 if (size < xfersize) {
2101 if (size == 0)
2102 break;
2103 xfersize = size;
2104 }
2105 error = uiomove((char *)bp->b_data + blkoffset,
2106 (int)xfersize, uio);
2107 if (error)
2108 break;
2109 vfs_bio_brelse(bp, ioflag);
2110 }
2111
2112 /*
2113 * This can only happen in the case of an error because the loop
2114 * above resets bp to NULL on each iteration and on normal
2115 * completion has not set a new value into it. so it must have come
2116 * from a 'break' statement
2117 */
2118 if (bp != NULL)
2119 vfs_bio_brelse(bp, ioflag);
2120
2121 if ((error == 0 || uio->uio_resid != orig_resid) &&
2122 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
2123 ip->i_flag |= IN_ACCESS;
2124 return (error);
2125 }
2126
2127 static int
2128 ext2_ioctl(struct vop_ioctl_args *ap)
2129 {
2130 struct vnode *vp;
2131 int error;
2132
2133 vp = ap->a_vp;
2134 switch (ap->a_command) {
2135 case FIOSEEKDATA:
2136 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) {
2137 error = vn_lock(vp, LK_SHARED);
2138 if (error == 0) {
2139 error = ext2_bmap_seekdata(vp,
2140 (off_t *)ap->a_data);
2141 VOP_UNLOCK(vp);
2142 } else
2143 error = EBADF;
2144 return (error);
2145 }
2146 case FIOSEEKHOLE:
2147 return (vn_bmap_seekhole(vp, ap->a_command,
2148 (off_t *)ap->a_data, ap->a_cred));
2149 default:
2150 return (ENOTTY);
2151 }
2152 }
2153
2154 /*
2155 * Vnode op for writing.
2156 */
2157 static int
2158 ext2_write(struct vop_write_args *ap)
2159 {
2160 struct vnode *vp;
2161 struct uio *uio;
2162 struct inode *ip;
2163 struct m_ext2fs *fs;
2164 struct buf *bp;
2165 daddr_t lbn;
2166 off_t osize;
2167 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
2168
2169 ioflag = ap->a_ioflag;
2170 uio = ap->a_uio;
2171 vp = ap->a_vp;
2172
2173 seqcount = ioflag >> IO_SEQSHIFT;
2174 ip = VTOI(vp);
2175
2176 #ifdef INVARIANTS
2177 if (uio->uio_rw != UIO_WRITE)
2178 panic("%s: mode", "ext2_write");
2179 #endif
2180
2181 switch (vp->v_type) {
2182 case VREG:
2183 if (ioflag & IO_APPEND)
2184 uio->uio_offset = ip->i_size;
2185 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
2186 return (EPERM);
2187 /* FALLTHROUGH */
2188 case VLNK:
2189 break;
2190 case VDIR:
2191 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
2192 if ((ioflag & IO_SYNC) == 0)
2193 panic("ext2_write: nonsync dir write");
2194 break;
2195 default:
2196 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
2197 vp->v_type, (intmax_t)uio->uio_offset,
2198 (intmax_t)uio->uio_resid);
2199 }
2200
2201 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
2202 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
2203 fs = ip->i_e2fs;
2204 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
2205 return (EFBIG);
2206 /*
2207 * Maybe this should be above the vnode op call, but so long as
2208 * file servers have no limits, I don't think it matters.
2209 */
2210 error = vn_rlimit_fsize(vp, uio, uio->uio_td);
2211 if (error != 0)
2212 return (error);
2213
2214 resid = uio->uio_resid;
2215 osize = ip->i_size;
2216 if (seqcount > BA_SEQMAX)
2217 flags = BA_SEQMAX << BA_SEQSHIFT;
2218 else
2219 flags = seqcount << BA_SEQSHIFT;
2220 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
2221 flags |= IO_SYNC;
2222
2223 for (error = 0; uio->uio_resid > 0;) {
2224 lbn = lblkno(fs, uio->uio_offset);
2225 blkoffset = blkoff(fs, uio->uio_offset);
2226 xfersize = fs->e2fs_fsize - blkoffset;
2227 if (uio->uio_resid < xfersize)
2228 xfersize = uio->uio_resid;
2229 if (uio->uio_offset + xfersize > ip->i_size)
2230 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
2231
2232 /*
2233 * We must perform a read-before-write if the transfer size
2234 * does not cover the entire buffer.
2235 */
2236 if (fs->e2fs_bsize > xfersize)
2237 flags |= BA_CLRBUF;
2238 else
2239 flags &= ~BA_CLRBUF;
2240 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
2241 ap->a_cred, &bp, flags);
2242 if (error != 0)
2243 break;
2244
2245 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
2246 bp->b_flags |= B_NOCACHE;
2247 if (uio->uio_offset + xfersize > ip->i_size)
2248 ip->i_size = uio->uio_offset + xfersize;
2249 size = blksize(fs, ip, lbn) - bp->b_resid;
2250 if (size < xfersize)
2251 xfersize = size;
2252
2253 error =
2254 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
2255 /*
2256 * If the buffer is not already filled and we encounter an
2257 * error while trying to fill it, we have to clear out any
2258 * garbage data from the pages instantiated for the buffer.
2259 * If we do not, a failed uiomove() during a write can leave
2260 * the prior contents of the pages exposed to a userland mmap.
2261 *
2262 * Note that we need only clear buffers with a transfer size
2263 * equal to the block size because buffers with a shorter
2264 * transfer size were cleared above by the call to ext2_balloc()
2265 * with the BA_CLRBUF flag set.
2266 *
2267 * If the source region for uiomove identically mmaps the
2268 * buffer, uiomove() performed the NOP copy, and the buffer
2269 * content remains valid because the page fault handler
2270 * validated the pages.
2271 */
2272 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2273 fs->e2fs_bsize == xfersize)
2274 vfs_bio_clrbuf(bp);
2275
2276 vfs_bio_set_flags(bp, ioflag);
2277
2278 /*
2279 * If IO_SYNC each buffer is written synchronously. Otherwise
2280 * if we have a severe page deficiency write the buffer
2281 * asynchronously. Otherwise try to cluster, and if that
2282 * doesn't do it then either do an async write (if O_DIRECT),
2283 * or a delayed write (if not).
2284 */
2285 if (ioflag & IO_SYNC) {
2286 (void)bwrite(bp);
2287 } else if (vm_page_count_severe() ||
2288 buf_dirty_count_severe() ||
2289 (ioflag & IO_ASYNC)) {
2290 bp->b_flags |= B_CLUSTEROK;
2291 bawrite(bp);
2292 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2293 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2294 bp->b_flags |= B_CLUSTEROK;
2295 cluster_write(vp, &ip->i_clusterw, bp,
2296 ip->i_size, seqcount, 0);
2297 } else {
2298 bawrite(bp);
2299 }
2300 } else if (ioflag & IO_DIRECT) {
2301 bp->b_flags |= B_CLUSTEROK;
2302 bawrite(bp);
2303 } else {
2304 bp->b_flags |= B_CLUSTEROK;
2305 bdwrite(bp);
2306 }
2307 if (error || xfersize == 0)
2308 break;
2309 }
2310 /*
2311 * If we successfully wrote any data, and we are not the superuser
2312 * we clear the setuid and setgid bits as a precaution against
2313 * tampering.
2314 */
2315 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2316 ap->a_cred) {
2317 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID))
2318 ip->i_mode &= ~(ISUID | ISGID);
2319 }
2320 if (error) {
2321 if (ioflag & IO_UNIT) {
2322 (void)ext2_truncate(vp, osize,
2323 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2324 uio->uio_offset -= resid - uio->uio_resid;
2325 uio->uio_resid = resid;
2326 }
2327 }
2328 if (uio->uio_resid != resid) {
2329 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2330 if (ioflag & IO_SYNC)
2331 error = ext2_update(vp, 1);
2332 }
2333 return (error);
2334 }
Cache object: 37a94448c6a1d1089366a935bf64e3a0
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