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 static vop_kqfilter_t ext2fifo_kqfilter;
139
140 /* Global vfs data structures for ext2. */
141 struct vop_vector ext2_vnodeops = {
142 .vop_default = &default_vnodeops,
143 .vop_access = ext2_access,
144 .vop_bmap = ext2_bmap,
145 .vop_cachedlookup = ext2_lookup,
146 .vop_close = ext2_close,
147 .vop_create = ext2_create,
148 .vop_fsync = ext2_fsync,
149 .vop_getpages = vnode_pager_local_getpages,
150 .vop_getpages_async = vnode_pager_local_getpages_async,
151 .vop_getattr = ext2_getattr,
152 .vop_inactive = ext2_inactive,
153 .vop_ioctl = ext2_ioctl,
154 .vop_link = ext2_link,
155 .vop_lookup = vfs_cache_lookup,
156 .vop_mkdir = ext2_mkdir,
157 .vop_mknod = ext2_mknod,
158 .vop_open = ext2_open,
159 .vop_pathconf = ext2_pathconf,
160 .vop_poll = vop_stdpoll,
161 .vop_print = ext2_print,
162 .vop_read = ext2_read,
163 .vop_readdir = ext2_readdir,
164 .vop_readlink = ext2_readlink,
165 .vop_reallocblks = ext2_reallocblks,
166 .vop_reclaim = ext2_reclaim,
167 .vop_remove = ext2_remove,
168 .vop_rename = ext2_rename,
169 .vop_rmdir = ext2_rmdir,
170 .vop_setattr = ext2_setattr,
171 .vop_strategy = ext2_strategy,
172 .vop_symlink = ext2_symlink,
173 .vop_write = ext2_write,
174 .vop_deleteextattr = ext2_deleteextattr,
175 .vop_getextattr = ext2_getextattr,
176 .vop_listextattr = ext2_listextattr,
177 .vop_setextattr = ext2_setextattr,
178 #ifdef UFS_ACL
179 .vop_getacl = ext2_getacl,
180 .vop_setacl = ext2_setacl,
181 .vop_aclcheck = ext2_aclcheck,
182 #endif /* UFS_ACL */
183 .vop_vptofh = ext2_vptofh,
184 };
185 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops);
186
187 struct vop_vector ext2_fifoops = {
188 .vop_default = &fifo_specops,
189 .vop_access = ext2_access,
190 .vop_close = ext2fifo_close,
191 .vop_fsync = ext2_fsync,
192 .vop_getattr = ext2_getattr,
193 .vop_inactive = ext2_inactive,
194 .vop_kqfilter = ext2fifo_kqfilter,
195 .vop_pathconf = ext2_pathconf,
196 .vop_print = ext2_print,
197 .vop_read = VOP_PANIC,
198 .vop_reclaim = ext2_reclaim,
199 .vop_setattr = ext2_setattr,
200 .vop_write = VOP_PANIC,
201 .vop_vptofh = ext2_vptofh,
202 };
203 VFS_VOP_VECTOR_REGISTER(ext2_fifoops);
204
205 /*
206 * A virgin directory (no blushing please).
207 * Note that the type and namlen fields are reversed relative to ext2.
208 * Also, we don't use `struct odirtemplate', since it would just cause
209 * endianness problems.
210 */
211 static struct dirtemplate mastertemplate = {
212 0, htole16(12), 1, EXT2_FT_DIR, ".",
213 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".."
214 };
215 static struct dirtemplate omastertemplate = {
216 0, htole16(12), 1, EXT2_FT_UNKNOWN, ".",
217 0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".."
218 };
219
220 static void
221 ext2_itimes_locked(struct vnode *vp)
222 {
223 struct inode *ip;
224 struct timespec ts;
225
226 ASSERT_VI_LOCKED(vp, __func__);
227
228 ip = VTOI(vp);
229 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
230 return;
231 if ((vp->v_type == VBLK || vp->v_type == VCHR))
232 ip->i_flag |= IN_LAZYMOD;
233 else
234 ip->i_flag |= IN_MODIFIED;
235 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
236 vfs_timestamp(&ts);
237 if (ip->i_flag & IN_ACCESS) {
238 ip->i_atime = ts.tv_sec;
239 ip->i_atimensec = ts.tv_nsec;
240 }
241 if (ip->i_flag & IN_UPDATE) {
242 ip->i_mtime = ts.tv_sec;
243 ip->i_mtimensec = ts.tv_nsec;
244 ip->i_modrev++;
245 }
246 if (ip->i_flag & IN_CHANGE) {
247 ip->i_ctime = ts.tv_sec;
248 ip->i_ctimensec = ts.tv_nsec;
249 }
250 }
251 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
252 }
253
254 void
255 ext2_itimes(struct vnode *vp)
256 {
257
258 VI_LOCK(vp);
259 ext2_itimes_locked(vp);
260 VI_UNLOCK(vp);
261 }
262
263 /*
264 * Create a regular file
265 */
266 static int
267 ext2_create(struct vop_create_args *ap)
268 {
269 int error;
270
271 error =
272 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
273 ap->a_dvp, ap->a_vpp, ap->a_cnp);
274 if (error != 0)
275 return (error);
276 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
277 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
278 return (0);
279 }
280
281 static int
282 ext2_open(struct vop_open_args *ap)
283 {
284
285 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
286 return (EOPNOTSUPP);
287
288 /*
289 * Files marked append-only must be opened for appending.
290 */
291 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
292 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
293 return (EPERM);
294
295 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
296
297 return (0);
298 }
299
300 /*
301 * Close called.
302 *
303 * Update the times on the inode.
304 */
305 static int
306 ext2_close(struct vop_close_args *ap)
307 {
308 struct vnode *vp = ap->a_vp;
309
310 VI_LOCK(vp);
311 if (vp->v_usecount > 1)
312 ext2_itimes_locked(vp);
313 VI_UNLOCK(vp);
314 return (0);
315 }
316
317 static int
318 ext2_access(struct vop_access_args *ap)
319 {
320 struct vnode *vp = ap->a_vp;
321 struct inode *ip = VTOI(vp);
322 accmode_t accmode = ap->a_accmode;
323 int error;
324
325 if (vp->v_type == VBLK || vp->v_type == VCHR)
326 return (EOPNOTSUPP);
327
328 /*
329 * Disallow write attempts on read-only file systems;
330 * unless the file is a socket, fifo, or a block or
331 * character device resident on the file system.
332 */
333 if (accmode & VWRITE) {
334 switch (vp->v_type) {
335 case VDIR:
336 case VLNK:
337 case VREG:
338 if (vp->v_mount->mnt_flag & MNT_RDONLY)
339 return (EROFS);
340 break;
341 default:
342 break;
343 }
344 }
345
346 /* If immutable bit set, nobody gets to write it. */
347 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
348 return (EPERM);
349
350 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
351 ap->a_accmode, ap->a_cred);
352 return (error);
353 }
354
355 static int
356 ext2_getattr(struct vop_getattr_args *ap)
357 {
358 struct vnode *vp = ap->a_vp;
359 struct inode *ip = VTOI(vp);
360 struct vattr *vap = ap->a_vap;
361
362 ext2_itimes(vp);
363 /*
364 * Copy from inode table
365 */
366 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
367 vap->va_fileid = ip->i_number;
368 vap->va_mode = ip->i_mode & ~IFMT;
369 vap->va_nlink = ip->i_nlink;
370 vap->va_uid = ip->i_uid;
371 vap->va_gid = ip->i_gid;
372 vap->va_rdev = ip->i_rdev;
373 vap->va_size = ip->i_size;
374 vap->va_atime.tv_sec = ip->i_atime;
375 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
376 vap->va_mtime.tv_sec = ip->i_mtime;
377 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
378 vap->va_ctime.tv_sec = ip->i_ctime;
379 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
380 if E2DI_HAS_XTIME(ip) {
381 vap->va_birthtime.tv_sec = ip->i_birthtime;
382 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
383 }
384 vap->va_flags = ip->i_flags;
385 vap->va_gen = ip->i_gen;
386 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
387 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
388 vap->va_type = IFTOVT(ip->i_mode);
389 vap->va_filerev = ip->i_modrev;
390 return (0);
391 }
392
393 /*
394 * Set attribute vnode op. called from several syscalls
395 */
396 static int
397 ext2_setattr(struct vop_setattr_args *ap)
398 {
399 struct vattr *vap = ap->a_vap;
400 struct vnode *vp = ap->a_vp;
401 struct inode *ip = VTOI(vp);
402 struct ucred *cred = ap->a_cred;
403 struct thread *td = curthread;
404 int error;
405
406 /*
407 * Check for unsettable attributes.
408 */
409 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
410 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
411 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
412 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
413 return (EINVAL);
414 }
415 if (vap->va_flags != VNOVAL) {
416 /* Disallow flags not supported by ext2fs. */
417 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
418 return (EOPNOTSUPP);
419
420 if (vp->v_mount->mnt_flag & MNT_RDONLY)
421 return (EROFS);
422 /*
423 * Callers may only modify the file flags on objects they
424 * have VADMIN rights for.
425 */
426 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
427 return (error);
428 /*
429 * Unprivileged processes and privileged processes in
430 * jail() are not permitted to unset system flags, or
431 * modify flags if any system flags are set.
432 * Privileged non-jail processes may not modify system flags
433 * if securelevel > 0 and any existing system flags are set.
434 */
435 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) {
436 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
437 error = securelevel_gt(cred, 0);
438 if (error)
439 return (error);
440 }
441 } else {
442 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
443 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
444 return (EPERM);
445 }
446 ip->i_flags = vap->va_flags;
447 ip->i_flag |= IN_CHANGE;
448 if (ip->i_flags & (IMMUTABLE | APPEND))
449 return (0);
450 }
451 if (ip->i_flags & (IMMUTABLE | APPEND))
452 return (EPERM);
453 /*
454 * Go through the fields and update iff not VNOVAL.
455 */
456 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
457 if (vp->v_mount->mnt_flag & MNT_RDONLY)
458 return (EROFS);
459 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
460 td)) != 0)
461 return (error);
462 }
463 if (vap->va_size != VNOVAL) {
464 /*
465 * Disallow write attempts on read-only file systems;
466 * unless the file is a socket, fifo, or a block or
467 * character device resident on the file system.
468 */
469 switch (vp->v_type) {
470 case VDIR:
471 return (EISDIR);
472 case VLNK:
473 case VREG:
474 if (vp->v_mount->mnt_flag & MNT_RDONLY)
475 return (EROFS);
476 break;
477 default:
478 break;
479 }
480 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
481 return (error);
482 }
483 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
484 if (vp->v_mount->mnt_flag & MNT_RDONLY)
485 return (EROFS);
486 /*
487 * From utimes(2):
488 * If times is NULL, ... The caller must be the owner of
489 * the file, have permission to write the file, or be the
490 * super-user.
491 * If times is non-NULL, ... The caller must be the owner of
492 * the file or be the super-user.
493 */
494 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
495 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
496 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
497 return (error);
498 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
499 if (vap->va_atime.tv_sec != VNOVAL) {
500 ip->i_flag &= ~IN_ACCESS;
501 ip->i_atime = vap->va_atime.tv_sec;
502 ip->i_atimensec = vap->va_atime.tv_nsec;
503 }
504 if (vap->va_mtime.tv_sec != VNOVAL) {
505 ip->i_flag &= ~IN_UPDATE;
506 ip->i_mtime = vap->va_mtime.tv_sec;
507 ip->i_mtimensec = vap->va_mtime.tv_nsec;
508 }
509 ip->i_birthtime = vap->va_birthtime.tv_sec;
510 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
511 error = ext2_update(vp, 0);
512 if (error)
513 return (error);
514 }
515 error = 0;
516 if (vap->va_mode != (mode_t)VNOVAL) {
517 if (vp->v_mount->mnt_flag & MNT_RDONLY)
518 return (EROFS);
519 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
520 }
521 return (error);
522 }
523
524 /*
525 * Change the mode on a file.
526 * Inode must be locked before calling.
527 */
528 static int
529 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
530 {
531 struct inode *ip = VTOI(vp);
532 int error;
533
534 /*
535 * To modify the permissions on a file, must possess VADMIN
536 * for that file.
537 */
538 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
539 return (error);
540 /*
541 * Privileged processes may set the sticky bit on non-directories,
542 * as well as set the setgid bit on a file with a group that the
543 * process is not a member of.
544 */
545 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
546 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE);
547 if (error)
548 return (EFTYPE);
549 }
550 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
551 error = priv_check_cred(cred, PRIV_VFS_SETGID);
552 if (error)
553 return (error);
554 }
555 ip->i_mode &= ~ALLPERMS;
556 ip->i_mode |= (mode & ALLPERMS);
557 ip->i_flag |= IN_CHANGE;
558 return (0);
559 }
560
561 /*
562 * Perform chown operation on inode ip;
563 * inode must be locked prior to call.
564 */
565 static int
566 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
567 struct thread *td)
568 {
569 struct inode *ip = VTOI(vp);
570 uid_t ouid;
571 gid_t ogid;
572 int error = 0;
573
574 if (uid == (uid_t)VNOVAL)
575 uid = ip->i_uid;
576 if (gid == (gid_t)VNOVAL)
577 gid = ip->i_gid;
578 /*
579 * To modify the ownership of a file, must possess VADMIN
580 * for that file.
581 */
582 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
583 return (error);
584 /*
585 * To change the owner of a file, or change the group of a file
586 * to a group of which we are not a member, the caller must
587 * have privilege.
588 */
589 if (uid != ip->i_uid || (gid != ip->i_gid &&
590 !groupmember(gid, cred))) {
591 error = priv_check_cred(cred, PRIV_VFS_CHOWN);
592 if (error)
593 return (error);
594 }
595 ogid = ip->i_gid;
596 ouid = ip->i_uid;
597 ip->i_gid = gid;
598 ip->i_uid = uid;
599 ip->i_flag |= IN_CHANGE;
600 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
601 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0)
602 ip->i_mode &= ~(ISUID | ISGID);
603 }
604 return (0);
605 }
606
607 /*
608 * Synch an open file.
609 */
610 /* ARGSUSED */
611 static int
612 ext2_fsync(struct vop_fsync_args *ap)
613 {
614 /*
615 * Flush all dirty buffers associated with a vnode.
616 */
617
618 vop_stdfsync(ap);
619
620 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
621 }
622
623 /*
624 * Mknod vnode call
625 */
626 /* ARGSUSED */
627 static int
628 ext2_mknod(struct vop_mknod_args *ap)
629 {
630 struct vattr *vap = ap->a_vap;
631 struct vnode **vpp = ap->a_vpp;
632 struct inode *ip;
633 ino_t ino;
634 int error;
635
636 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
637 ap->a_dvp, vpp, ap->a_cnp);
638 if (error)
639 return (error);
640 ip = VTOI(*vpp);
641 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
642 if (vap->va_rdev != VNOVAL) {
643 /*
644 * Want to be able to use this to make badblock
645 * inodes, so don't truncate the dev number.
646 */
647 if (!(ip->i_flag & IN_E4EXTENTS))
648 ip->i_rdev = vap->va_rdev;
649 }
650 /*
651 * Remove inode, then reload it through VFS_VGET so it is
652 * checked to see if it is an alias of an existing entry in
653 * the inode cache. XXX I don't believe this is necessary now.
654 */
655 (*vpp)->v_type = VNON;
656 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
657 vgone(*vpp);
658 vput(*vpp);
659 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
660 if (error) {
661 *vpp = NULL;
662 return (error);
663 }
664 return (0);
665 }
666
667 static int
668 ext2_remove(struct vop_remove_args *ap)
669 {
670 struct inode *ip;
671 struct vnode *vp = ap->a_vp;
672 struct vnode *dvp = ap->a_dvp;
673 int error;
674
675 ip = VTOI(vp);
676 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
677 (VTOI(dvp)->i_flags & APPEND)) {
678 error = EPERM;
679 goto out;
680 }
681 error = ext2_dirremove(dvp, ap->a_cnp);
682 if (error == 0) {
683 ip->i_nlink--;
684 ip->i_flag |= IN_CHANGE;
685 }
686 out:
687 return (error);
688 }
689
690 /*
691 * link vnode call
692 */
693 static int
694 ext2_link(struct vop_link_args *ap)
695 {
696 struct vnode *vp = ap->a_vp;
697 struct vnode *tdvp = ap->a_tdvp;
698 struct componentname *cnp = ap->a_cnp;
699 struct inode *ip;
700 int error;
701
702 #ifdef INVARIANTS
703 if ((cnp->cn_flags & HASBUF) == 0)
704 panic("ext2_link: no name");
705 #endif
706 ip = VTOI(vp);
707 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) {
708 error = EMLINK;
709 goto out;
710 }
711 if (ip->i_flags & (IMMUTABLE | APPEND)) {
712 error = EPERM;
713 goto out;
714 }
715 ip->i_nlink++;
716 ip->i_flag |= IN_CHANGE;
717 error = ext2_update(vp, !DOINGASYNC(vp));
718 if (!error)
719 error = ext2_direnter(ip, tdvp, cnp);
720 if (error) {
721 ip->i_nlink--;
722 ip->i_flag |= IN_CHANGE;
723 }
724 out:
725 return (error);
726 }
727
728 static int
729 ext2_inc_nlink(struct inode *ip)
730 {
731
732 ip->i_nlink++;
733
734 if (S_ISDIR(ip->i_mode) &&
735 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) &&
736 ip->i_nlink > 1) {
737 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2)
738 ip->i_nlink = 1;
739 } else if (ip->i_nlink > EXT4_LINK_MAX) {
740 ip->i_nlink--;
741 return (EMLINK);
742 }
743
744 return (0);
745 }
746
747 static void
748 ext2_dec_nlink(struct inode *ip)
749 {
750
751 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2)
752 ip->i_nlink--;
753 }
754
755 /*
756 * Rename system call.
757 * rename("foo", "bar");
758 * is essentially
759 * unlink("bar");
760 * link("foo", "bar");
761 * unlink("foo");
762 * but ``atomically''. Can't do full commit without saving state in the
763 * inode on disk which isn't feasible at this time. Best we can do is
764 * always guarantee the target exists.
765 *
766 * Basic algorithm is:
767 *
768 * 1) Bump link count on source while we're linking it to the
769 * target. This also ensure the inode won't be deleted out
770 * from underneath us while we work (it may be truncated by
771 * a concurrent `trunc' or `open' for creation).
772 * 2) Link source to destination. If destination already exists,
773 * delete it first.
774 * 3) Unlink source reference to inode if still around. If a
775 * directory was moved and the parent of the destination
776 * is different from the source, patch the ".." entry in the
777 * directory.
778 */
779 static int
780 ext2_rename(struct vop_rename_args *ap)
781 {
782 struct vnode *tvp = ap->a_tvp;
783 struct vnode *tdvp = ap->a_tdvp;
784 struct vnode *fvp = ap->a_fvp;
785 struct vnode *fdvp = ap->a_fdvp;
786 struct componentname *tcnp = ap->a_tcnp;
787 struct componentname *fcnp = ap->a_fcnp;
788 struct inode *ip, *xp, *dp;
789 struct dirtemplate *dirbuf;
790 int doingdirectory = 0, oldparent = 0, newparent = 0;
791 int error = 0;
792 u_char namlen;
793
794 #ifdef INVARIANTS
795 if ((tcnp->cn_flags & HASBUF) == 0 ||
796 (fcnp->cn_flags & HASBUF) == 0)
797 panic("ext2_rename: no name");
798 #endif
799 /*
800 * Check for cross-device rename.
801 */
802 if ((fvp->v_mount != tdvp->v_mount) ||
803 (tvp && (fvp->v_mount != tvp->v_mount))) {
804 error = EXDEV;
805 abortit:
806 if (tdvp == tvp)
807 vrele(tdvp);
808 else
809 vput(tdvp);
810 if (tvp)
811 vput(tvp);
812 vrele(fdvp);
813 vrele(fvp);
814 return (error);
815 }
816
817 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
818 (VTOI(tdvp)->i_flags & APPEND))) {
819 error = EPERM;
820 goto abortit;
821 }
822
823 /*
824 * Renaming a file to itself has no effect. The upper layers should
825 * not call us in that case. Temporarily just warn if they do.
826 */
827 if (fvp == tvp) {
828 SDT_PROBE2(ext2fs, , vnops, trace, 1,
829 "rename: fvp == tvp (can't happen)");
830 error = 0;
831 goto abortit;
832 }
833
834 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
835 goto abortit;
836 dp = VTOI(fdvp);
837 ip = VTOI(fvp);
838 if (ip->i_nlink >= EXT4_LINK_MAX &&
839 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
840 VOP_UNLOCK(fvp);
841 error = EMLINK;
842 goto abortit;
843 }
844 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
845 || (dp->i_flags & APPEND)) {
846 VOP_UNLOCK(fvp);
847 error = EPERM;
848 goto abortit;
849 }
850 if ((ip->i_mode & IFMT) == IFDIR) {
851 /*
852 * Avoid ".", "..", and aliases of "." for obvious reasons.
853 */
854 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
855 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
856 (ip->i_flag & IN_RENAME)) {
857 VOP_UNLOCK(fvp);
858 error = EINVAL;
859 goto abortit;
860 }
861 ip->i_flag |= IN_RENAME;
862 oldparent = dp->i_number;
863 doingdirectory++;
864 }
865 vrele(fdvp);
866
867 /*
868 * When the target exists, both the directory
869 * and target vnodes are returned locked.
870 */
871 dp = VTOI(tdvp);
872 xp = NULL;
873 if (tvp)
874 xp = VTOI(tvp);
875
876 /*
877 * 1) Bump link count while we're moving stuff
878 * around. If we crash somewhere before
879 * completing our work, the link count
880 * may be wrong, but correctable.
881 */
882 ext2_inc_nlink(ip);
883 ip->i_flag |= IN_CHANGE;
884 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
885 VOP_UNLOCK(fvp);
886 goto bad;
887 }
888
889 /*
890 * If ".." must be changed (ie the directory gets a new
891 * parent) then the source directory must not be in the
892 * directory hierarchy above the target, as this would
893 * orphan everything below the source directory. Also
894 * the user must have write permission in the source so
895 * as to be able to change "..". We must repeat the call
896 * to namei, as the parent directory is unlocked by the
897 * call to checkpath().
898 */
899 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
900 VOP_UNLOCK(fvp);
901 if (oldparent != dp->i_number)
902 newparent = dp->i_number;
903 if (doingdirectory && newparent) {
904 if (error) /* write access check above */
905 goto bad;
906 if (xp != NULL)
907 vput(tvp);
908 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
909 if (error)
910 goto out;
911 VREF(tdvp);
912 error = relookup(tdvp, &tvp, tcnp);
913 if (error)
914 goto out;
915 vrele(tdvp);
916 dp = VTOI(tdvp);
917 xp = NULL;
918 if (tvp)
919 xp = VTOI(tvp);
920 }
921 /*
922 * 2) If target doesn't exist, link the target
923 * to the source and unlink the source.
924 * Otherwise, rewrite the target directory
925 * entry to reference the source inode and
926 * expunge the original entry's existence.
927 */
928 if (xp == NULL) {
929 if (dp->i_devvp != ip->i_devvp)
930 panic("ext2_rename: EXDEV");
931 /*
932 * Account for ".." in new directory.
933 * When source and destination have the same
934 * parent we don't fool with the link count.
935 */
936 if (doingdirectory && newparent) {
937 error = ext2_inc_nlink(dp);
938 if (error)
939 goto bad;
940
941 dp->i_flag |= IN_CHANGE;
942 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
943 if (error)
944 goto bad;
945 }
946 error = ext2_direnter(ip, tdvp, tcnp);
947 if (error) {
948 if (doingdirectory && newparent) {
949 ext2_dec_nlink(dp);
950 dp->i_flag |= IN_CHANGE;
951 (void)ext2_update(tdvp, 1);
952 }
953 goto bad;
954 }
955 vput(tdvp);
956 } else {
957 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
958 panic("ext2_rename: EXDEV");
959 /*
960 * Short circuit rename(foo, foo).
961 */
962 if (xp->i_number == ip->i_number)
963 panic("ext2_rename: same file");
964 /*
965 * If the parent directory is "sticky", then the user must
966 * own the parent directory, or the destination of the rename,
967 * otherwise the destination may not be changed (except by
968 * root). This implements append-only directories.
969 */
970 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
971 tcnp->cn_cred->cr_uid != dp->i_uid &&
972 xp->i_uid != tcnp->cn_cred->cr_uid) {
973 error = EPERM;
974 goto bad;
975 }
976 /*
977 * Target must be empty if a directory and have no links
978 * to it. Also, ensure source and target are compatible
979 * (both directories, or both not directories).
980 */
981 if ((xp->i_mode & IFMT) == IFDIR) {
982 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
983 error = ENOTEMPTY;
984 goto bad;
985 }
986 if (!doingdirectory) {
987 error = ENOTDIR;
988 goto bad;
989 }
990 cache_purge(tdvp);
991 } else if (doingdirectory) {
992 error = EISDIR;
993 goto bad;
994 }
995 error = ext2_dirrewrite(dp, ip, tcnp);
996 if (error)
997 goto bad;
998 /*
999 * If the target directory is in the same
1000 * directory as the source directory,
1001 * decrement the link count on the parent
1002 * of the target directory.
1003 */
1004 if (doingdirectory && !newparent) {
1005 ext2_dec_nlink(dp);
1006 dp->i_flag |= IN_CHANGE;
1007 }
1008 vput(tdvp);
1009 /*
1010 * Adjust the link count of the target to
1011 * reflect the dirrewrite above. If this is
1012 * a directory it is empty and there are
1013 * no links to it, so we can squash the inode and
1014 * any space associated with it. We disallowed
1015 * renaming over top of a directory with links to
1016 * it above, as the remaining link would point to
1017 * a directory without "." or ".." entries.
1018 */
1019 ext2_dec_nlink(xp);
1020 if (doingdirectory) {
1021 if (xp->i_nlink > 2)
1022 panic("ext2_rename: linked directory");
1023 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
1024 tcnp->cn_cred, tcnp->cn_thread);
1025 xp->i_nlink = 0;
1026 }
1027 xp->i_flag |= IN_CHANGE;
1028 vput(tvp);
1029 xp = NULL;
1030 }
1031
1032 /*
1033 * 3) Unlink the source.
1034 */
1035 fcnp->cn_flags &= ~MODMASK;
1036 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1037 VREF(fdvp);
1038 error = relookup(fdvp, &fvp, fcnp);
1039 if (error == 0)
1040 vrele(fdvp);
1041 if (fvp != NULL) {
1042 xp = VTOI(fvp);
1043 dp = VTOI(fdvp);
1044 } else {
1045 /*
1046 * From name has disappeared. IN_RENAME is not sufficient
1047 * to protect against directory races due to timing windows,
1048 * so we can't panic here.
1049 */
1050 vrele(ap->a_fvp);
1051 return (0);
1052 }
1053 /*
1054 * Ensure that the directory entry still exists and has not
1055 * changed while the new name has been entered. If the source is
1056 * a file then the entry may have been unlinked or renamed. In
1057 * either case there is no further work to be done. If the source
1058 * is a directory then it cannot have been rmdir'ed; its link
1059 * count of three would cause a rmdir to fail with ENOTEMPTY.
1060 * The IN_RENAME flag ensures that it cannot be moved by another
1061 * rename.
1062 */
1063 if (xp != ip) {
1064 /*
1065 * From name resolves to a different inode. IN_RENAME is
1066 * not sufficient protection against timing window races
1067 * so we can't panic here.
1068 */
1069 } else {
1070 /*
1071 * If the source is a directory with a
1072 * new parent, the link count of the old
1073 * parent directory must be decremented
1074 * and ".." set to point to the new parent.
1075 */
1076 if (doingdirectory && newparent) {
1077 ext2_dec_nlink(dp);
1078 dp->i_flag |= IN_CHANGE;
1079 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO);
1080 error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf,
1081 ip->i_e2fs->e2fs_bsize, (off_t)0,
1082 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1083 tcnp->cn_cred, NOCRED, NULL, NULL);
1084 if (error == 0) {
1085 /* Like ufs little-endian: */
1086 namlen = dirbuf->dotdot_type;
1087 if (namlen != 2 ||
1088 dirbuf->dotdot_name[0] != '.' ||
1089 dirbuf->dotdot_name[1] != '.') {
1090 ext2_dirbad(xp, (doff_t)12,
1091 "rename: mangled dir");
1092 } else {
1093 dirbuf->dotdot_ino = htole32(newparent);
1094 /*
1095 * dirblock 0 could be htree root,
1096 * try both csum update functions.
1097 */
1098 ext2_dirent_csum_set(ip,
1099 (struct ext2fs_direct_2 *)dirbuf);
1100 ext2_dx_csum_set(ip,
1101 (struct ext2fs_direct_2 *)dirbuf);
1102 (void)vn_rdwr(UIO_WRITE, fvp,
1103 (caddr_t)dirbuf,
1104 ip->i_e2fs->e2fs_bsize,
1105 (off_t)0, UIO_SYSSPACE,
1106 IO_NODELOCKED | IO_SYNC |
1107 IO_NOMACCHECK, tcnp->cn_cred,
1108 NOCRED, NULL, NULL);
1109 cache_purge(fdvp);
1110 }
1111 }
1112 free(dirbuf, M_TEMP);
1113 }
1114 error = ext2_dirremove(fdvp, fcnp);
1115 if (!error) {
1116 ext2_dec_nlink(xp);
1117 xp->i_flag |= IN_CHANGE;
1118 }
1119 xp->i_flag &= ~IN_RENAME;
1120 }
1121 if (dp)
1122 vput(fdvp);
1123 if (xp)
1124 vput(fvp);
1125 vrele(ap->a_fvp);
1126 return (error);
1127
1128 bad:
1129 if (xp)
1130 vput(ITOV(xp));
1131 vput(ITOV(dp));
1132 out:
1133 if (doingdirectory)
1134 ip->i_flag &= ~IN_RENAME;
1135 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1136 ext2_dec_nlink(ip);
1137 ip->i_flag |= IN_CHANGE;
1138 ip->i_flag &= ~IN_RENAME;
1139 vput(fvp);
1140 } else
1141 vrele(fvp);
1142 return (error);
1143 }
1144
1145 #ifdef UFS_ACL
1146 static int
1147 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
1148 mode_t dmode, struct ucred *cred, struct thread *td)
1149 {
1150 int error;
1151 struct inode *ip = VTOI(tvp);
1152 struct acl *dacl, *acl;
1153
1154 acl = acl_alloc(M_WAITOK);
1155 dacl = acl_alloc(M_WAITOK);
1156
1157 /*
1158 * Retrieve default ACL from parent, if any.
1159 */
1160 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1161 switch (error) {
1162 case 0:
1163 /*
1164 * Retrieved a default ACL, so merge mode and ACL if
1165 * necessary. If the ACL is empty, fall through to
1166 * the "not defined or available" case.
1167 */
1168 if (acl->acl_cnt != 0) {
1169 dmode = acl_posix1e_newfilemode(dmode, acl);
1170 ip->i_mode = dmode;
1171 *dacl = *acl;
1172 ext2_sync_acl_from_inode(ip, acl);
1173 break;
1174 }
1175 /* FALLTHROUGH */
1176
1177 case EOPNOTSUPP:
1178 /*
1179 * Just use the mode as-is.
1180 */
1181 ip->i_mode = dmode;
1182 error = 0;
1183 goto out;
1184
1185 default:
1186 goto out;
1187 }
1188
1189 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1190 if (error == 0)
1191 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
1192 switch (error) {
1193 case 0:
1194 break;
1195
1196 case EOPNOTSUPP:
1197 /*
1198 * XXX: This should not happen, as EOPNOTSUPP above
1199 * was supposed to free acl.
1200 */
1201 #ifdef DEBUG
1202 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
1203 #endif /* DEBUG */
1204 break;
1205
1206 default:
1207 goto out;
1208 }
1209
1210 out:
1211 acl_free(acl);
1212 acl_free(dacl);
1213
1214 return (error);
1215 }
1216
1217 static int
1218 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
1219 mode_t mode, struct ucred *cred, struct thread *td)
1220 {
1221 int error;
1222 struct inode *ip = VTOI(tvp);
1223 struct acl *acl;
1224
1225 acl = acl_alloc(M_WAITOK);
1226
1227 /*
1228 * Retrieve default ACL for parent, if any.
1229 */
1230 error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
1231 switch (error) {
1232 case 0:
1233 /*
1234 * Retrieved a default ACL, so merge mode and ACL if
1235 * necessary.
1236 */
1237 if (acl->acl_cnt != 0) {
1238 /*
1239 * Two possible ways for default ACL to not
1240 * be present. First, the EA can be
1241 * undefined, or second, the default ACL can
1242 * be blank. If it's blank, fall through to
1243 * the it's not defined case.
1244 */
1245 mode = acl_posix1e_newfilemode(mode, acl);
1246 ip->i_mode = mode;
1247 ext2_sync_acl_from_inode(ip, acl);
1248 break;
1249 }
1250 /* FALLTHROUGH */
1251
1252 case EOPNOTSUPP:
1253 /*
1254 * Just use the mode as-is.
1255 */
1256 ip->i_mode = mode;
1257 error = 0;
1258 goto out;
1259
1260 default:
1261 goto out;
1262 }
1263
1264 error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
1265 switch (error) {
1266 case 0:
1267 break;
1268
1269 case EOPNOTSUPP:
1270 /*
1271 * XXX: This should not happen, as EOPNOTSUPP above was
1272 * supposed to free acl.
1273 */
1274 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1275 "but no VOP_SETACL()\n");
1276 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
1277 "but no VOP_SETACL()"); */
1278 break;
1279
1280 default:
1281 goto out;
1282 }
1283
1284 out:
1285 acl_free(acl);
1286
1287 return (error);
1288 }
1289
1290 #endif /* UFS_ACL */
1291
1292 /*
1293 * Mkdir system call
1294 */
1295 static int
1296 ext2_mkdir(struct vop_mkdir_args *ap)
1297 {
1298 struct m_ext2fs *fs;
1299 struct vnode *dvp = ap->a_dvp;
1300 struct vattr *vap = ap->a_vap;
1301 struct componentname *cnp = ap->a_cnp;
1302 struct inode *ip, *dp;
1303 struct vnode *tvp;
1304 struct dirtemplate dirtemplate, *dtp;
1305 char *buf = NULL;
1306 int error, dmode;
1307
1308 #ifdef INVARIANTS
1309 if ((cnp->cn_flags & HASBUF) == 0)
1310 panic("ext2_mkdir: no name");
1311 #endif
1312 dp = VTOI(dvp);
1313 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX &&
1314 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
1315 error = EMLINK;
1316 goto out;
1317 }
1318 dmode = vap->va_mode & 0777;
1319 dmode |= IFDIR;
1320 /*
1321 * Must simulate part of ext2_makeinode here to acquire the inode,
1322 * but not have it entered in the parent directory. The entry is
1323 * made later after writing "." and ".." entries.
1324 */
1325 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1326 if (error)
1327 goto out;
1328 ip = VTOI(tvp);
1329 fs = ip->i_e2fs;
1330 ip->i_gid = dp->i_gid;
1331 #ifdef SUIDDIR
1332 {
1333 /*
1334 * if we are hacking owners here, (only do this where told to)
1335 * and we are not giving it TOO root, (would subvert quotas)
1336 * then go ahead and give it to the other user.
1337 * The new directory also inherits the SUID bit.
1338 * If user's UID and dir UID are the same,
1339 * 'give it away' so that the SUID is still forced on.
1340 */
1341 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1342 (dp->i_mode & ISUID) && dp->i_uid) {
1343 dmode |= ISUID;
1344 ip->i_uid = dp->i_uid;
1345 } else {
1346 ip->i_uid = cnp->cn_cred->cr_uid;
1347 }
1348 }
1349 #else
1350 ip->i_uid = cnp->cn_cred->cr_uid;
1351 #endif
1352 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1353 ip->i_mode = dmode;
1354 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1355 ip->i_nlink = 2;
1356 if (cnp->cn_flags & ISWHITEOUT)
1357 ip->i_flags |= UF_OPAQUE;
1358 error = ext2_update(tvp, 1);
1359
1360 /*
1361 * Bump link count in parent directory
1362 * to reflect work done below. Should
1363 * be done before reference is created
1364 * so reparation is possible if we crash.
1365 */
1366 ext2_inc_nlink(dp);
1367 dp->i_flag |= IN_CHANGE;
1368 error = ext2_update(dvp, !DOINGASYNC(dvp));
1369 if (error)
1370 goto bad;
1371
1372 /* Initialize directory with "." and ".." from static template. */
1373 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1374 EXT2F_INCOMPAT_FTYPE))
1375 dtp = &mastertemplate;
1376 else
1377 dtp = &omastertemplate;
1378 dirtemplate = *dtp;
1379 dirtemplate.dot_ino = htole32(ip->i_number);
1380 dirtemplate.dotdot_ino = htole32(dp->i_number);
1381 /*
1382 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
1383 * just redefine it - for this function only
1384 */
1385 #undef DIRBLKSIZ
1386 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1387 dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12);
1388 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO);
1389 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
1390 dirtemplate.dotdot_reclen =
1391 htole16(le16toh(dirtemplate.dotdot_reclen) -
1392 sizeof(struct ext2fs_direct_tail));
1393 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ));
1394 }
1395 memcpy(buf, &dirtemplate, sizeof(dirtemplate));
1396 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf);
1397 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf,
1398 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE,
1399 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1400 NULL, NULL);
1401 if (error) {
1402 ext2_dec_nlink(dp);
1403 dp->i_flag |= IN_CHANGE;
1404 goto bad;
1405 }
1406 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1407 /* XXX should grow with balloc() */
1408 panic("ext2_mkdir: blksize");
1409 else {
1410 ip->i_size = DIRBLKSIZ;
1411 ip->i_flag |= IN_CHANGE;
1412 }
1413
1414 #ifdef UFS_ACL
1415 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1416 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
1417 cnp->cn_cred, cnp->cn_thread);
1418 if (error)
1419 goto bad;
1420 }
1421
1422 #endif /* UFS_ACL */
1423
1424 /* Directory set up, now install its entry in the parent directory. */
1425 error = ext2_direnter(ip, dvp, cnp);
1426 if (error) {
1427 ext2_dec_nlink(dp);
1428 dp->i_flag |= IN_CHANGE;
1429 }
1430 bad:
1431 /*
1432 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1433 * for us because we set the link count to 0.
1434 */
1435 if (error) {
1436 ip->i_nlink = 0;
1437 ip->i_flag |= IN_CHANGE;
1438 vput(tvp);
1439 } else
1440 *ap->a_vpp = tvp;
1441 out:
1442 free(buf, M_TEMP);
1443 return (error);
1444 #undef DIRBLKSIZ
1445 #define DIRBLKSIZ DEV_BSIZE
1446 }
1447
1448 /*
1449 * Rmdir system call.
1450 */
1451 static int
1452 ext2_rmdir(struct vop_rmdir_args *ap)
1453 {
1454 struct vnode *vp = ap->a_vp;
1455 struct vnode *dvp = ap->a_dvp;
1456 struct componentname *cnp = ap->a_cnp;
1457 struct inode *ip, *dp;
1458 int error;
1459
1460 ip = VTOI(vp);
1461 dp = VTOI(dvp);
1462
1463 /*
1464 * Verify the directory is empty (and valid).
1465 * (Rmdir ".." won't be valid since
1466 * ".." will contain a reference to
1467 * the current directory and thus be
1468 * non-empty.)
1469 */
1470 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1471 error = ENOTEMPTY;
1472 goto out;
1473 }
1474 if ((dp->i_flags & APPEND)
1475 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1476 error = EPERM;
1477 goto out;
1478 }
1479 /*
1480 * Delete reference to directory before purging
1481 * inode. If we crash in between, the directory
1482 * will be reattached to lost+found,
1483 */
1484 error = ext2_dirremove(dvp, cnp);
1485 if (error)
1486 goto out;
1487 ext2_dec_nlink(dp);
1488 dp->i_flag |= IN_CHANGE;
1489 cache_purge(dvp);
1490 VOP_UNLOCK(dvp);
1491 /*
1492 * Truncate inode. The only stuff left
1493 * in the directory is "." and "..".
1494 */
1495 ip->i_nlink = 0;
1496 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1497 cnp->cn_thread);
1498 cache_purge(ITOV(ip));
1499 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1500 VOP_UNLOCK(vp);
1501 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1502 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1503 }
1504 out:
1505 return (error);
1506 }
1507
1508 /*
1509 * symlink -- make a symbolic link
1510 */
1511 static int
1512 ext2_symlink(struct vop_symlink_args *ap)
1513 {
1514 struct vnode *vp, **vpp = ap->a_vpp;
1515 struct inode *ip;
1516 int len, error;
1517
1518 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1519 vpp, ap->a_cnp);
1520 if (error)
1521 return (error);
1522 vp = *vpp;
1523 len = strlen(ap->a_target);
1524 if (len < vp->v_mount->mnt_maxsymlinklen) {
1525 ip = VTOI(vp);
1526 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1527 ip->i_size = len;
1528 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1529 } else
1530 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target),
1531 len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1532 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1533 if (error)
1534 vput(vp);
1535 return (error);
1536 }
1537
1538 /*
1539 * Return target name of a symbolic link
1540 */
1541 static int
1542 ext2_readlink(struct vop_readlink_args *ap)
1543 {
1544 struct vnode *vp = ap->a_vp;
1545 struct inode *ip = VTOI(vp);
1546 int isize;
1547
1548 isize = ip->i_size;
1549 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1550 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1551 return (0);
1552 }
1553 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1554 }
1555
1556 /*
1557 * Calculate the logical to physical mapping if not done already,
1558 * then call the device strategy routine.
1559 *
1560 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1561 * deadlock on memory. See ext2_bmap() for details.
1562 */
1563 static int
1564 ext2_strategy(struct vop_strategy_args *ap)
1565 {
1566 struct buf *bp = ap->a_bp;
1567 struct vnode *vp = ap->a_vp;
1568 struct bufobj *bo;
1569 daddr_t blkno;
1570 int error;
1571
1572 if (vp->v_type == VBLK || vp->v_type == VCHR)
1573 panic("ext2_strategy: spec");
1574 if (bp->b_blkno == bp->b_lblkno) {
1575 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS)
1576 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL);
1577 else
1578 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1579
1580 bp->b_blkno = blkno;
1581 if (error) {
1582 bp->b_error = error;
1583 bp->b_ioflags |= BIO_ERROR;
1584 bufdone(bp);
1585 return (0);
1586 }
1587 if ((long)bp->b_blkno == -1)
1588 vfs_bio_clrbuf(bp);
1589 }
1590 if ((long)bp->b_blkno == -1) {
1591 bufdone(bp);
1592 return (0);
1593 }
1594 bp->b_iooffset = dbtob(bp->b_blkno);
1595 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1596 BO_STRATEGY(bo, bp);
1597 return (0);
1598 }
1599
1600 /*
1601 * Print out the contents of an inode.
1602 */
1603 static int
1604 ext2_print(struct vop_print_args *ap)
1605 {
1606 struct vnode *vp = ap->a_vp;
1607 struct inode *ip = VTOI(vp);
1608
1609 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
1610 if (vp->v_type == VFIFO)
1611 fifo_printinfo(vp);
1612 printf("\n");
1613 return (0);
1614 }
1615
1616 /*
1617 * Close wrapper for fifos.
1618 *
1619 * Update the times on the inode then do device close.
1620 */
1621 static int
1622 ext2fifo_close(struct vop_close_args *ap)
1623 {
1624 struct vnode *vp = ap->a_vp;
1625
1626 VI_LOCK(vp);
1627 if (vp->v_usecount > 1)
1628 ext2_itimes_locked(vp);
1629 VI_UNLOCK(vp);
1630 return (fifo_specops.vop_close(ap));
1631 }
1632
1633 /*
1634 * Kqfilter wrapper for fifos.
1635 *
1636 * Fall through to ext2 kqfilter routines if needed
1637 */
1638 static int
1639 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1640 {
1641 int error;
1642
1643 error = fifo_specops.vop_kqfilter(ap);
1644 if (error)
1645 error = vfs_kqfilter(ap);
1646 return (error);
1647 }
1648
1649 /*
1650 * Return POSIX pathconf information applicable to ext2 filesystems.
1651 */
1652 static int
1653 ext2_pathconf(struct vop_pathconf_args *ap)
1654 {
1655 int error = 0;
1656
1657 switch (ap->a_name) {
1658 case _PC_LINK_MAX:
1659 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs,
1660 EXT2F_ROCOMPAT_DIR_NLINK))
1661 *ap->a_retval = INT_MAX;
1662 else
1663 *ap->a_retval = EXT4_LINK_MAX;
1664 break;
1665 case _PC_NAME_MAX:
1666 *ap->a_retval = NAME_MAX;
1667 break;
1668 case _PC_PIPE_BUF:
1669 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
1670 *ap->a_retval = PIPE_BUF;
1671 else
1672 error = EINVAL;
1673 break;
1674 case _PC_CHOWN_RESTRICTED:
1675 *ap->a_retval = 1;
1676 break;
1677 case _PC_NO_TRUNC:
1678 *ap->a_retval = 1;
1679 break;
1680
1681 #ifdef UFS_ACL
1682 case _PC_ACL_EXTENDED:
1683 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1684 *ap->a_retval = 1;
1685 else
1686 *ap->a_retval = 0;
1687 break;
1688 case _PC_ACL_PATH_MAX:
1689 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1690 *ap->a_retval = ACL_MAX_ENTRIES;
1691 else
1692 *ap->a_retval = 3;
1693 break;
1694 #endif /* UFS_ACL */
1695
1696 case _PC_MIN_HOLE_SIZE:
1697 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1698 break;
1699 case _PC_PRIO_IO:
1700 *ap->a_retval = 0;
1701 break;
1702 case _PC_SYNC_IO:
1703 *ap->a_retval = 0;
1704 break;
1705 case _PC_ALLOC_SIZE_MIN:
1706 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1707 break;
1708 case _PC_FILESIZEBITS:
1709 *ap->a_retval = 64;
1710 break;
1711 case _PC_REC_INCR_XFER_SIZE:
1712 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1713 break;
1714 case _PC_REC_MAX_XFER_SIZE:
1715 *ap->a_retval = -1; /* means ``unlimited'' */
1716 break;
1717 case _PC_REC_MIN_XFER_SIZE:
1718 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1719 break;
1720 case _PC_REC_XFER_ALIGN:
1721 *ap->a_retval = PAGE_SIZE;
1722 break;
1723 case _PC_SYMLINK_MAX:
1724 *ap->a_retval = MAXPATHLEN;
1725 break;
1726
1727 default:
1728 error = vop_stdpathconf(ap);
1729 break;
1730 }
1731 return (error);
1732 }
1733
1734 /*
1735 * Vnode operation to remove a named attribute.
1736 */
1737 static int
1738 ext2_deleteextattr(struct vop_deleteextattr_args *ap)
1739 {
1740 struct inode *ip;
1741 struct m_ext2fs *fs;
1742 int error;
1743
1744 ip = VTOI(ap->a_vp);
1745 fs = ip->i_e2fs;
1746
1747 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1748 return (EOPNOTSUPP);
1749
1750 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1751 return (EOPNOTSUPP);
1752
1753 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1754 ap->a_cred, ap->a_td, VWRITE);
1755 if (error)
1756 return (error);
1757
1758 error = ENOATTR;
1759
1760 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1761 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name);
1762 if (error != ENOATTR)
1763 return (error);
1764 }
1765
1766 if (ip->i_facl)
1767 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name);
1768
1769 return (error);
1770 }
1771
1772 /*
1773 * Vnode operation to retrieve a named extended attribute.
1774 */
1775 static int
1776 ext2_getextattr(struct vop_getextattr_args *ap)
1777 {
1778 struct inode *ip;
1779 struct m_ext2fs *fs;
1780 int error;
1781
1782 ip = VTOI(ap->a_vp);
1783 fs = ip->i_e2fs;
1784
1785 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1786 return (EOPNOTSUPP);
1787
1788 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1789 return (EOPNOTSUPP);
1790
1791 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1792 ap->a_cred, ap->a_td, VREAD);
1793 if (error)
1794 return (error);
1795
1796 if (ap->a_size != NULL)
1797 *ap->a_size = 0;
1798
1799 error = ENOATTR;
1800
1801 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1802 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace,
1803 ap->a_name, ap->a_uio, ap->a_size);
1804 if (error != ENOATTR)
1805 return (error);
1806 }
1807
1808 if (ip->i_facl)
1809 error = ext2_extattr_block_get(ip, ap->a_attrnamespace,
1810 ap->a_name, ap->a_uio, ap->a_size);
1811
1812 return (error);
1813 }
1814
1815 /*
1816 * Vnode operation to retrieve extended attributes on a vnode.
1817 */
1818 static int
1819 ext2_listextattr(struct vop_listextattr_args *ap)
1820 {
1821 struct inode *ip;
1822 struct m_ext2fs *fs;
1823 int error;
1824
1825 ip = VTOI(ap->a_vp);
1826 fs = ip->i_e2fs;
1827
1828 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1829 return (EOPNOTSUPP);
1830
1831 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1832 return (EOPNOTSUPP);
1833
1834 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1835 ap->a_cred, ap->a_td, VREAD);
1836 if (error)
1837 return (error);
1838
1839 if (ap->a_size != NULL)
1840 *ap->a_size = 0;
1841
1842 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1843 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace,
1844 ap->a_uio, ap->a_size);
1845 if (error)
1846 return (error);
1847 }
1848
1849 if (ip->i_facl)
1850 error = ext2_extattr_block_list(ip, ap->a_attrnamespace,
1851 ap->a_uio, ap->a_size);
1852
1853 return (error);
1854 }
1855
1856 /*
1857 * Vnode operation to set a named attribute.
1858 */
1859 static int
1860 ext2_setextattr(struct vop_setextattr_args *ap)
1861 {
1862 struct inode *ip;
1863 struct m_ext2fs *fs;
1864 int error;
1865
1866 ip = VTOI(ap->a_vp);
1867 fs = ip->i_e2fs;
1868
1869 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1870 return (EOPNOTSUPP);
1871
1872 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1873 return (EOPNOTSUPP);
1874
1875 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1876 ap->a_cred, ap->a_td, VWRITE);
1877 if (error)
1878 return (error);
1879
1880 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name);
1881 if (error)
1882 return (error);
1883
1884 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1885 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace,
1886 ap->a_name, ap->a_uio);
1887 if (error != ENOSPC)
1888 return (error);
1889 }
1890
1891 error = ext2_extattr_block_set(ip, ap->a_attrnamespace,
1892 ap->a_name, ap->a_uio);
1893
1894 return (error);
1895 }
1896
1897 /*
1898 * Vnode pointer to File handle
1899 */
1900 /* ARGSUSED */
1901 static int
1902 ext2_vptofh(struct vop_vptofh_args *ap)
1903 {
1904 struct inode *ip;
1905 struct ufid *ufhp;
1906
1907 ip = VTOI(ap->a_vp);
1908 ufhp = (struct ufid *)ap->a_fhp;
1909 ufhp->ufid_len = sizeof(struct ufid);
1910 ufhp->ufid_ino = ip->i_number;
1911 ufhp->ufid_gen = ip->i_gen;
1912 return (0);
1913 }
1914
1915 /*
1916 * Initialize the vnode associated with a new inode, handle aliased
1917 * vnodes.
1918 */
1919 int
1920 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1921 {
1922 struct inode *ip;
1923 struct vnode *vp;
1924
1925 vp = *vpp;
1926 ip = VTOI(vp);
1927 vp->v_type = IFTOVT(ip->i_mode);
1928 /*
1929 * Only unallocated inodes should be of type VNON.
1930 */
1931 if (ip->i_mode != 0 && vp->v_type == VNON)
1932 return (EINVAL);
1933 if (vp->v_type == VFIFO)
1934 vp->v_op = fifoops;
1935
1936 if (ip->i_number == EXT2_ROOTINO)
1937 vp->v_vflag |= VV_ROOT;
1938 ip->i_modrev = init_va_filerev();
1939 *vpp = vp;
1940 return (0);
1941 }
1942
1943 /*
1944 * Allocate a new inode.
1945 */
1946 static int
1947 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1948 struct componentname *cnp)
1949 {
1950 struct inode *ip, *pdir;
1951 struct vnode *tvp;
1952 int error;
1953
1954 pdir = VTOI(dvp);
1955 #ifdef INVARIANTS
1956 if ((cnp->cn_flags & HASBUF) == 0)
1957 panic("ext2_makeinode: no name");
1958 #endif
1959 *vpp = NULL;
1960 if ((mode & IFMT) == 0)
1961 mode |= IFREG;
1962
1963 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1964 if (error) {
1965 return (error);
1966 }
1967 ip = VTOI(tvp);
1968 ip->i_gid = pdir->i_gid;
1969 #ifdef SUIDDIR
1970 {
1971 /*
1972 * if we are
1973 * not the owner of the directory,
1974 * and we are hacking owners here, (only do this where told to)
1975 * and we are not giving it TOO root, (would subvert quotas)
1976 * then go ahead and give it to the other user.
1977 * Note that this drops off the execute bits for security.
1978 */
1979 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1980 (pdir->i_mode & ISUID) &&
1981 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1982 ip->i_uid = pdir->i_uid;
1983 mode &= ~07111;
1984 } else {
1985 ip->i_uid = cnp->cn_cred->cr_uid;
1986 }
1987 }
1988 #else
1989 ip->i_uid = cnp->cn_cred->cr_uid;
1990 #endif
1991 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1992 ip->i_mode = mode;
1993 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1994 ip->i_nlink = 1;
1995 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1996 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID))
1997 ip->i_mode &= ~ISGID;
1998 }
1999
2000 if (cnp->cn_flags & ISWHITEOUT)
2001 ip->i_flags |= UF_OPAQUE;
2002
2003 /*
2004 * Make sure inode goes to disk before directory entry.
2005 */
2006 error = ext2_update(tvp, !DOINGASYNC(tvp));
2007 if (error)
2008 goto bad;
2009
2010 #ifdef UFS_ACL
2011 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
2012 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
2013 cnp->cn_cred, cnp->cn_thread);
2014 if (error)
2015 goto bad;
2016 }
2017 #endif /* UFS_ACL */
2018
2019 error = ext2_direnter(ip, dvp, cnp);
2020 if (error)
2021 goto bad;
2022
2023 *vpp = tvp;
2024 return (0);
2025
2026 bad:
2027 /*
2028 * Write error occurred trying to update the inode
2029 * or the directory so must deallocate the inode.
2030 */
2031 ip->i_nlink = 0;
2032 ip->i_flag |= IN_CHANGE;
2033 vput(tvp);
2034 return (error);
2035 }
2036
2037 /*
2038 * Vnode op for reading.
2039 */
2040 static int
2041 ext2_read(struct vop_read_args *ap)
2042 {
2043 struct vnode *vp;
2044 struct inode *ip;
2045 struct uio *uio;
2046 struct m_ext2fs *fs;
2047 struct buf *bp;
2048 daddr_t lbn, nextlbn;
2049 off_t bytesinfile;
2050 long size, xfersize, blkoffset;
2051 int error, orig_resid, seqcount;
2052 int ioflag;
2053
2054 vp = ap->a_vp;
2055 uio = ap->a_uio;
2056 ioflag = ap->a_ioflag;
2057
2058 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
2059 ip = VTOI(vp);
2060
2061 #ifdef INVARIANTS
2062 if (uio->uio_rw != UIO_READ)
2063 panic("%s: mode", "ext2_read");
2064
2065 if (vp->v_type == VLNK) {
2066 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
2067 panic("%s: short symlink", "ext2_read");
2068 } else if (vp->v_type != VREG && vp->v_type != VDIR)
2069 panic("%s: type %d", "ext2_read", vp->v_type);
2070 #endif
2071 orig_resid = uio->uio_resid;
2072 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
2073 if (orig_resid == 0)
2074 return (0);
2075 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
2076 fs = ip->i_e2fs;
2077 if (uio->uio_offset < ip->i_size &&
2078 uio->uio_offset >= fs->e2fs_maxfilesize)
2079 return (EOVERFLOW);
2080
2081 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
2082 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
2083 break;
2084 lbn = lblkno(fs, uio->uio_offset);
2085 nextlbn = lbn + 1;
2086 size = blksize(fs, ip, lbn);
2087 blkoffset = blkoff(fs, uio->uio_offset);
2088
2089 xfersize = fs->e2fs_fsize - blkoffset;
2090 if (uio->uio_resid < xfersize)
2091 xfersize = uio->uio_resid;
2092 if (bytesinfile < xfersize)
2093 xfersize = bytesinfile;
2094
2095 if (lblktosize(fs, nextlbn) >= ip->i_size)
2096 error = bread(vp, lbn, size, NOCRED, &bp);
2097 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
2098 error = cluster_read(vp, ip->i_size, lbn, size,
2099 NOCRED, blkoffset + uio->uio_resid, seqcount,
2100 0, &bp);
2101 } else if (seqcount > 1) {
2102 u_int nextsize = blksize(fs, ip, nextlbn);
2103
2104 error = breadn(vp, lbn,
2105 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
2106 } else
2107 error = bread(vp, lbn, size, NOCRED, &bp);
2108 if (error) {
2109 brelse(bp);
2110 bp = NULL;
2111 break;
2112 }
2113
2114 /*
2115 * We should only get non-zero b_resid when an I/O error
2116 * has occurred, which should cause us to break above.
2117 * However, if the short read did not cause an error,
2118 * then we want to ensure that we do not uiomove bad
2119 * or uninitialized data.
2120 */
2121 size -= bp->b_resid;
2122 if (size < xfersize) {
2123 if (size == 0)
2124 break;
2125 xfersize = size;
2126 }
2127 error = uiomove((char *)bp->b_data + blkoffset,
2128 (int)xfersize, uio);
2129 if (error)
2130 break;
2131 vfs_bio_brelse(bp, ioflag);
2132 }
2133
2134 /*
2135 * This can only happen in the case of an error because the loop
2136 * above resets bp to NULL on each iteration and on normal
2137 * completion has not set a new value into it. so it must have come
2138 * from a 'break' statement
2139 */
2140 if (bp != NULL)
2141 vfs_bio_brelse(bp, ioflag);
2142
2143 if ((error == 0 || uio->uio_resid != orig_resid) &&
2144 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
2145 ip->i_flag |= IN_ACCESS;
2146 return (error);
2147 }
2148
2149 static int
2150 ext2_ioctl(struct vop_ioctl_args *ap)
2151 {
2152 struct vnode *vp;
2153 int error;
2154
2155 vp = ap->a_vp;
2156 switch (ap->a_command) {
2157 case FIOSEEKDATA:
2158 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) {
2159 error = vn_lock(vp, LK_SHARED);
2160 if (error == 0) {
2161 error = ext2_bmap_seekdata(vp,
2162 (off_t *)ap->a_data);
2163 VOP_UNLOCK(vp);
2164 } else
2165 error = EBADF;
2166 return (error);
2167 }
2168 case FIOSEEKHOLE:
2169 return (vn_bmap_seekhole(vp, ap->a_command,
2170 (off_t *)ap->a_data, ap->a_cred));
2171 default:
2172 return (ENOTTY);
2173 }
2174 }
2175
2176 /*
2177 * Vnode op for writing.
2178 */
2179 static int
2180 ext2_write(struct vop_write_args *ap)
2181 {
2182 struct vnode *vp;
2183 struct uio *uio;
2184 struct inode *ip;
2185 struct m_ext2fs *fs;
2186 struct buf *bp;
2187 daddr_t lbn;
2188 off_t osize;
2189 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
2190
2191 ioflag = ap->a_ioflag;
2192 uio = ap->a_uio;
2193 vp = ap->a_vp;
2194
2195 seqcount = ioflag >> IO_SEQSHIFT;
2196 ip = VTOI(vp);
2197
2198 #ifdef INVARIANTS
2199 if (uio->uio_rw != UIO_WRITE)
2200 panic("%s: mode", "ext2_write");
2201 #endif
2202
2203 switch (vp->v_type) {
2204 case VREG:
2205 if (ioflag & IO_APPEND)
2206 uio->uio_offset = ip->i_size;
2207 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
2208 return (EPERM);
2209 /* FALLTHROUGH */
2210 case VLNK:
2211 break;
2212 case VDIR:
2213 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
2214 if ((ioflag & IO_SYNC) == 0)
2215 panic("ext2_write: nonsync dir write");
2216 break;
2217 default:
2218 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
2219 vp->v_type, (intmax_t)uio->uio_offset,
2220 (intmax_t)uio->uio_resid);
2221 }
2222
2223 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
2224 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
2225 fs = ip->i_e2fs;
2226 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
2227 return (EFBIG);
2228 /*
2229 * Maybe this should be above the vnode op call, but so long as
2230 * file servers have no limits, I don't think it matters.
2231 */
2232 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
2233 return (EFBIG);
2234
2235 resid = uio->uio_resid;
2236 osize = ip->i_size;
2237 if (seqcount > BA_SEQMAX)
2238 flags = BA_SEQMAX << BA_SEQSHIFT;
2239 else
2240 flags = seqcount << BA_SEQSHIFT;
2241 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
2242 flags |= IO_SYNC;
2243
2244 for (error = 0; uio->uio_resid > 0;) {
2245 lbn = lblkno(fs, uio->uio_offset);
2246 blkoffset = blkoff(fs, uio->uio_offset);
2247 xfersize = fs->e2fs_fsize - blkoffset;
2248 if (uio->uio_resid < xfersize)
2249 xfersize = uio->uio_resid;
2250 if (uio->uio_offset + xfersize > ip->i_size)
2251 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
2252
2253 /*
2254 * We must perform a read-before-write if the transfer size
2255 * does not cover the entire buffer.
2256 */
2257 if (fs->e2fs_bsize > xfersize)
2258 flags |= BA_CLRBUF;
2259 else
2260 flags &= ~BA_CLRBUF;
2261 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
2262 ap->a_cred, &bp, flags);
2263 if (error != 0)
2264 break;
2265
2266 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
2267 bp->b_flags |= B_NOCACHE;
2268 if (uio->uio_offset + xfersize > ip->i_size)
2269 ip->i_size = uio->uio_offset + xfersize;
2270 size = blksize(fs, ip, lbn) - bp->b_resid;
2271 if (size < xfersize)
2272 xfersize = size;
2273
2274 error =
2275 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
2276 /*
2277 * If the buffer is not already filled and we encounter an
2278 * error while trying to fill it, we have to clear out any
2279 * garbage data from the pages instantiated for the buffer.
2280 * If we do not, a failed uiomove() during a write can leave
2281 * the prior contents of the pages exposed to a userland mmap.
2282 *
2283 * Note that we need only clear buffers with a transfer size
2284 * equal to the block size because buffers with a shorter
2285 * transfer size were cleared above by the call to ext2_balloc()
2286 * with the BA_CLRBUF flag set.
2287 *
2288 * If the source region for uiomove identically mmaps the
2289 * buffer, uiomove() performed the NOP copy, and the buffer
2290 * content remains valid because the page fault handler
2291 * validated the pages.
2292 */
2293 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2294 fs->e2fs_bsize == xfersize)
2295 vfs_bio_clrbuf(bp);
2296
2297 vfs_bio_set_flags(bp, ioflag);
2298
2299 /*
2300 * If IO_SYNC each buffer is written synchronously. Otherwise
2301 * if we have a severe page deficiency write the buffer
2302 * asynchronously. Otherwise try to cluster, and if that
2303 * doesn't do it then either do an async write (if O_DIRECT),
2304 * or a delayed write (if not).
2305 */
2306 if (ioflag & IO_SYNC) {
2307 (void)bwrite(bp);
2308 } else if (vm_page_count_severe() ||
2309 buf_dirty_count_severe() ||
2310 (ioflag & IO_ASYNC)) {
2311 bp->b_flags |= B_CLUSTEROK;
2312 bawrite(bp);
2313 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2314 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2315 bp->b_flags |= B_CLUSTEROK;
2316 cluster_write(vp, bp, ip->i_size, seqcount, 0);
2317 } else {
2318 bawrite(bp);
2319 }
2320 } else if (ioflag & IO_DIRECT) {
2321 bp->b_flags |= B_CLUSTEROK;
2322 bawrite(bp);
2323 } else {
2324 bp->b_flags |= B_CLUSTEROK;
2325 bdwrite(bp);
2326 }
2327 if (error || xfersize == 0)
2328 break;
2329 }
2330 /*
2331 * If we successfully wrote any data, and we are not the superuser
2332 * we clear the setuid and setgid bits as a precaution against
2333 * tampering.
2334 */
2335 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2336 ap->a_cred) {
2337 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID))
2338 ip->i_mode &= ~(ISUID | ISGID);
2339 }
2340 if (error) {
2341 if (ioflag & IO_UNIT) {
2342 (void)ext2_truncate(vp, osize,
2343 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2344 uio->uio_offset -= resid - uio->uio_resid;
2345 uio->uio_resid = resid;
2346 }
2347 }
2348 if (uio->uio_resid != resid) {
2349 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2350 if (ioflag & IO_SYNC)
2351 error = ext2_update(vp, 1);
2352 }
2353 return (error);
2354 }
Cache object: c693fe2f88cb6e81d4234e8957d01cc6
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