1 /*-
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back ([email protected])
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
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_kqfilter = ext2fifo_kqfilter,
194 .vop_pathconf = ext2_pathconf,
195 .vop_print = ext2_print,
196 .vop_read = VOP_PANIC,
197 .vop_reclaim = ext2_reclaim,
198 .vop_setattr = ext2_setattr,
199 .vop_write = VOP_PANIC,
200 .vop_vptofh = ext2_vptofh,
201 };
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, 12, 1, EXT2_FT_DIR, ".",
211 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
212 };
213 static struct dirtemplate omastertemplate = {
214 0, 12, 1, EXT2_FT_UNKNOWN, ".",
215 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
216 };
217
218 static void
ext2_itimes_locked(struct vnode * vp)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
ext2_itimes(struct vnode * vp)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
ext2_create(struct vop_create_args * ap)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
ext2_open(struct vop_open_args * ap)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
ext2_close(struct vop_close_args * ap)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
ext2_access(struct vop_access_args * ap)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 if (vp->v_type == VBLK || vp->v_type == VCHR)
324 return (EOPNOTSUPP);
325
326 /*
327 * Disallow write attempts on read-only file systems;
328 * unless the file is a socket, fifo, or a block or
329 * character device resident on the file system.
330 */
331 if (accmode & VWRITE) {
332 switch (vp->v_type) {
333 case VDIR:
334 case VLNK:
335 case VREG:
336 if (vp->v_mount->mnt_flag & MNT_RDONLY)
337 return (EROFS);
338 break;
339 default:
340 break;
341 }
342 }
343
344 /* If immutable bit set, nobody gets to write it. */
345 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
346 return (EPERM);
347
348 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
349 ap->a_accmode, ap->a_cred, NULL);
350 return (error);
351 }
352
353 static int
ext2_getattr(struct vop_getattr_args * ap)354 ext2_getattr(struct vop_getattr_args *ap)
355 {
356 struct vnode *vp = ap->a_vp;
357 struct inode *ip = VTOI(vp);
358 struct vattr *vap = ap->a_vap;
359
360 ext2_itimes(vp);
361 /*
362 * Copy from inode table
363 */
364 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
365 vap->va_fileid = ip->i_number;
366 vap->va_mode = ip->i_mode & ~IFMT;
367 vap->va_nlink = ip->i_nlink;
368 vap->va_uid = ip->i_uid;
369 vap->va_gid = ip->i_gid;
370 vap->va_rdev = ip->i_rdev;
371 vap->va_size = ip->i_size;
372 vap->va_atime.tv_sec = ip->i_atime;
373 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
374 vap->va_mtime.tv_sec = ip->i_mtime;
375 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
376 vap->va_ctime.tv_sec = ip->i_ctime;
377 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
378 if E2DI_HAS_XTIME(ip) {
379 vap->va_birthtime.tv_sec = ip->i_birthtime;
380 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
381 }
382 vap->va_flags = ip->i_flags;
383 vap->va_gen = ip->i_gen;
384 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
385 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
386 vap->va_type = IFTOVT(ip->i_mode);
387 vap->va_filerev = ip->i_modrev;
388 return (0);
389 }
390
391 /*
392 * Set attribute vnode op. called from several syscalls
393 */
394 static int
ext2_setattr(struct vop_setattr_args * ap)395 ext2_setattr(struct vop_setattr_args *ap)
396 {
397 struct vattr *vap = ap->a_vap;
398 struct vnode *vp = ap->a_vp;
399 struct inode *ip = VTOI(vp);
400 struct ucred *cred = ap->a_cred;
401 struct thread *td = curthread;
402 int error;
403
404 /*
405 * Check for unsettable attributes.
406 */
407 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
408 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
409 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
410 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
411 return (EINVAL);
412 }
413 if (vap->va_flags != VNOVAL) {
414 /* Disallow flags not supported by ext2fs. */
415 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
416 return (EOPNOTSUPP);
417
418 if (vp->v_mount->mnt_flag & MNT_RDONLY)
419 return (EROFS);
420 /*
421 * Callers may only modify the file flags on objects they
422 * have VADMIN rights for.
423 */
424 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
425 return (error);
426 /*
427 * Unprivileged processes and privileged processes in
428 * jail() are not permitted to unset system flags, or
429 * modify flags if any system flags are set.
430 * Privileged non-jail processes may not modify system flags
431 * if securelevel > 0 and any existing system flags are set.
432 */
433 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
434 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
435 error = securelevel_gt(cred, 0);
436 if (error)
437 return (error);
438 }
439 } else {
440 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
441 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
442 return (EPERM);
443 }
444 ip->i_flags = vap->va_flags;
445 ip->i_flag |= IN_CHANGE;
446 if (ip->i_flags & (IMMUTABLE | APPEND))
447 return (0);
448 }
449 if (ip->i_flags & (IMMUTABLE | APPEND))
450 return (EPERM);
451 /*
452 * Go through the fields and update iff not VNOVAL.
453 */
454 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
455 if (vp->v_mount->mnt_flag & MNT_RDONLY)
456 return (EROFS);
457 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
458 td)) != 0)
459 return (error);
460 }
461 if (vap->va_size != VNOVAL) {
462 /*
463 * Disallow write attempts on read-only file systems;
464 * unless the file is a socket, fifo, or a block or
465 * character device resident on the file system.
466 */
467 switch (vp->v_type) {
468 case VDIR:
469 return (EISDIR);
470 case VLNK:
471 case VREG:
472 if (vp->v_mount->mnt_flag & MNT_RDONLY)
473 return (EROFS);
474 break;
475 default:
476 break;
477 }
478 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
479 return (error);
480 }
481 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
482 if (vp->v_mount->mnt_flag & MNT_RDONLY)
483 return (EROFS);
484 /*
485 * From utimes(2):
486 * If times is NULL, ... The caller must be the owner of
487 * the file, have permission to write the file, or be the
488 * super-user.
489 * If times is non-NULL, ... The caller must be the owner of
490 * the file or be the super-user.
491 */
492 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
493 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
494 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
495 return (error);
496 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
497 if (vap->va_atime.tv_sec != VNOVAL) {
498 ip->i_flag &= ~IN_ACCESS;
499 ip->i_atime = vap->va_atime.tv_sec;
500 ip->i_atimensec = vap->va_atime.tv_nsec;
501 }
502 if (vap->va_mtime.tv_sec != VNOVAL) {
503 ip->i_flag &= ~IN_UPDATE;
504 ip->i_mtime = vap->va_mtime.tv_sec;
505 ip->i_mtimensec = vap->va_mtime.tv_nsec;
506 }
507 ip->i_birthtime = vap->va_birthtime.tv_sec;
508 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
509 error = ext2_update(vp, 0);
510 if (error)
511 return (error);
512 }
513 error = 0;
514 if (vap->va_mode != (mode_t)VNOVAL) {
515 if (vp->v_mount->mnt_flag & MNT_RDONLY)
516 return (EROFS);
517 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
518 }
519 return (error);
520 }
521
522 /*
523 * Change the mode on a file.
524 * Inode must be locked before calling.
525 */
526 static int
ext2_chmod(struct vnode * vp,int mode,struct ucred * cred,struct thread * td)527 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
528 {
529 struct inode *ip = VTOI(vp);
530 int error;
531
532 /*
533 * To modify the permissions on a file, must possess VADMIN
534 * for that file.
535 */
536 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
537 return (error);
538 /*
539 * Privileged processes may set the sticky bit on non-directories,
540 * as well as set the setgid bit on a file with a group that the
541 * process is not a member of.
542 */
543 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
544 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
545 if (error)
546 return (EFTYPE);
547 }
548 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
549 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
550 if (error)
551 return (error);
552 }
553 ip->i_mode &= ~ALLPERMS;
554 ip->i_mode |= (mode & ALLPERMS);
555 ip->i_flag |= IN_CHANGE;
556 return (0);
557 }
558
559 /*
560 * Perform chown operation on inode ip;
561 * inode must be locked prior to call.
562 */
563 static int
ext2_chown(struct vnode * vp,uid_t uid,gid_t gid,struct ucred * cred,struct thread * td)564 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
565 struct thread *td)
566 {
567 struct inode *ip = VTOI(vp);
568 uid_t ouid;
569 gid_t ogid;
570 int error = 0;
571
572 if (uid == (uid_t)VNOVAL)
573 uid = ip->i_uid;
574 if (gid == (gid_t)VNOVAL)
575 gid = ip->i_gid;
576 /*
577 * To modify the ownership of a file, must possess VADMIN
578 * for that file.
579 */
580 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
581 return (error);
582 /*
583 * To change the owner of a file, or change the group of a file
584 * to a group of which we are not a member, the caller must
585 * have privilege.
586 */
587 if (uid != ip->i_uid || (gid != ip->i_gid &&
588 !groupmember(gid, cred))) {
589 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
590 if (error)
591 return (error);
592 }
593 ogid = ip->i_gid;
594 ouid = ip->i_uid;
595 ip->i_gid = gid;
596 ip->i_uid = uid;
597 ip->i_flag |= IN_CHANGE;
598 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
599 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
600 ip->i_mode &= ~(ISUID | ISGID);
601 }
602 return (0);
603 }
604
605 /*
606 * Synch an open file.
607 */
608 /* ARGSUSED */
609 static int
ext2_fsync(struct vop_fsync_args * ap)610 ext2_fsync(struct vop_fsync_args *ap)
611 {
612 /*
613 * Flush all dirty buffers associated with a vnode.
614 */
615
616 vop_stdfsync(ap);
617
618 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
619 }
620
621 /*
622 * Mknod vnode call
623 */
624 /* ARGSUSED */
625 static int
ext2_mknod(struct vop_mknod_args * ap)626 ext2_mknod(struct vop_mknod_args *ap)
627 {
628 struct vattr *vap = ap->a_vap;
629 struct vnode **vpp = ap->a_vpp;
630 struct inode *ip;
631 ino_t ino;
632 int error;
633
634 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
635 ap->a_dvp, vpp, ap->a_cnp);
636 if (error)
637 return (error);
638 ip = VTOI(*vpp);
639 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
640 if (vap->va_rdev != VNOVAL) {
641 /*
642 * Want to be able to use this to make badblock
643 * inodes, so don't truncate the dev number.
644 */
645 if (!(ip->i_flag & IN_E4EXTENTS))
646 ip->i_rdev = vap->va_rdev;
647 }
648 /*
649 * Remove inode, then reload it through VFS_VGET so it is
650 * checked to see if it is an alias of an existing entry in
651 * the inode cache. XXX I don't believe this is necessary now.
652 */
653 (*vpp)->v_type = VNON;
654 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
655 vgone(*vpp);
656 vput(*vpp);
657 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
658 if (error) {
659 *vpp = NULL;
660 return (error);
661 }
662 return (0);
663 }
664
665 static int
ext2_remove(struct vop_remove_args * ap)666 ext2_remove(struct vop_remove_args *ap)
667 {
668 struct inode *ip;
669 struct vnode *vp = ap->a_vp;
670 struct vnode *dvp = ap->a_dvp;
671 int error;
672
673 ip = VTOI(vp);
674 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
675 (VTOI(dvp)->i_flags & APPEND)) {
676 error = EPERM;
677 goto out;
678 }
679 error = ext2_dirremove(dvp, ap->a_cnp);
680 if (error == 0) {
681 ip->i_nlink--;
682 ip->i_flag |= IN_CHANGE;
683 }
684 out:
685 return (error);
686 }
687
688 /*
689 * link vnode call
690 */
691 static int
ext2_link(struct vop_link_args * ap)692 ext2_link(struct vop_link_args *ap)
693 {
694 struct vnode *vp = ap->a_vp;
695 struct vnode *tdvp = ap->a_tdvp;
696 struct componentname *cnp = ap->a_cnp;
697 struct inode *ip;
698 int error;
699
700 #ifdef INVARIANTS
701 if ((cnp->cn_flags & HASBUF) == 0)
702 panic("ext2_link: no name");
703 #endif
704 ip = VTOI(vp);
705 if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) {
706 error = EMLINK;
707 goto out;
708 }
709 if (ip->i_flags & (IMMUTABLE | APPEND)) {
710 error = EPERM;
711 goto out;
712 }
713 ip->i_nlink++;
714 ip->i_flag |= IN_CHANGE;
715 error = ext2_update(vp, !DOINGASYNC(vp));
716 if (!error)
717 error = ext2_direnter(ip, tdvp, cnp);
718 if (error) {
719 ip->i_nlink--;
720 ip->i_flag |= IN_CHANGE;
721 }
722 out:
723 return (error);
724 }
725
726 static int
ext2_inc_nlink(struct inode * ip)727 ext2_inc_nlink(struct inode *ip)
728 {
729
730 ip->i_nlink++;
731
732 if (S_ISDIR(ip->i_mode) &&
733 EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) &&
734 ip->i_nlink > 1) {
735 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2)
736 ip->i_nlink = 1;
737 } else if (ip->i_nlink > EXT4_LINK_MAX) {
738 ip->i_nlink--;
739 return (EMLINK);
740 }
741
742 return (0);
743 }
744
745 static void
ext2_dec_nlink(struct inode * ip)746 ext2_dec_nlink(struct inode *ip)
747 {
748
749 if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2)
750 ip->i_nlink--;
751 }
752
753 /*
754 * Rename system call.
755 * rename("foo", "bar");
756 * is essentially
757 * unlink("bar");
758 * link("foo", "bar");
759 * unlink("foo");
760 * but ``atomically''. Can't do full commit without saving state in the
761 * inode on disk which isn't feasible at this time. Best we can do is
762 * always guarantee the target exists.
763 *
764 * Basic algorithm is:
765 *
766 * 1) Bump link count on source while we're linking it to the
767 * target. This also ensure the inode won't be deleted out
768 * from underneath us while we work (it may be truncated by
769 * a concurrent `trunc' or `open' for creation).
770 * 2) Link source to destination. If destination already exists,
771 * delete it first.
772 * 3) Unlink source reference to inode if still around. If a
773 * directory was moved and the parent of the destination
774 * is different from the source, patch the ".." entry in the
775 * directory.
776 */
777 static int
ext2_rename(struct vop_rename_args * ap)778 ext2_rename(struct vop_rename_args *ap)
779 {
780 struct vnode *tvp = ap->a_tvp;
781 struct vnode *tdvp = ap->a_tdvp;
782 struct vnode *fvp = ap->a_fvp;
783 struct vnode *fdvp = ap->a_fdvp;
784 struct componentname *tcnp = ap->a_tcnp;
785 struct componentname *fcnp = ap->a_fcnp;
786 struct inode *ip, *xp, *dp;
787 struct dirtemplate *dirbuf;
788 int doingdirectory = 0, oldparent = 0, newparent = 0;
789 int error = 0;
790 u_char namlen;
791
792 #ifdef INVARIANTS
793 if ((tcnp->cn_flags & HASBUF) == 0 ||
794 (fcnp->cn_flags & HASBUF) == 0)
795 panic("ext2_rename: no name");
796 #endif
797 /*
798 * Check for cross-device rename.
799 */
800 if ((fvp->v_mount != tdvp->v_mount) ||
801 (tvp && (fvp->v_mount != tvp->v_mount))) {
802 error = EXDEV;
803 abortit:
804 if (tdvp == tvp)
805 vrele(tdvp);
806 else
807 vput(tdvp);
808 if (tvp)
809 vput(tvp);
810 vrele(fdvp);
811 vrele(fvp);
812 return (error);
813 }
814
815 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
816 (VTOI(tdvp)->i_flags & APPEND))) {
817 error = EPERM;
818 goto abortit;
819 }
820
821 /*
822 * Renaming a file to itself has no effect. The upper layers should
823 * not call us in that case. Temporarily just warn if they do.
824 */
825 if (fvp == tvp) {
826 SDT_PROBE2(ext2fs, , vnops, trace, 1,
827 "rename: fvp == tvp (can't happen)");
828 error = 0;
829 goto abortit;
830 }
831
832 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
833 goto abortit;
834 dp = VTOI(fdvp);
835 ip = VTOI(fvp);
836 if (ip->i_nlink >= EXT4_LINK_MAX &&
837 !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
838 VOP_UNLOCK(fvp, 0);
839 error = EMLINK;
840 goto abortit;
841 }
842 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
843 || (dp->i_flags & APPEND)) {
844 VOP_UNLOCK(fvp, 0);
845 error = EPERM;
846 goto abortit;
847 }
848 if ((ip->i_mode & IFMT) == IFDIR) {
849 /*
850 * Avoid ".", "..", and aliases of "." for obvious reasons.
851 */
852 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
853 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
854 (ip->i_flag & IN_RENAME)) {
855 VOP_UNLOCK(fvp, 0);
856 error = EINVAL;
857 goto abortit;
858 }
859 ip->i_flag |= IN_RENAME;
860 oldparent = dp->i_number;
861 doingdirectory++;
862 }
863 vrele(fdvp);
864
865 /*
866 * When the target exists, both the directory
867 * and target vnodes are returned locked.
868 */
869 dp = VTOI(tdvp);
870 xp = NULL;
871 if (tvp)
872 xp = VTOI(tvp);
873
874 /*
875 * 1) Bump link count while we're moving stuff
876 * around. If we crash somewhere before
877 * completing our work, the link count
878 * may be wrong, but correctable.
879 */
880 ext2_inc_nlink(ip);
881 ip->i_flag |= IN_CHANGE;
882 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
883 VOP_UNLOCK(fvp, 0);
884 goto bad;
885 }
886
887 /*
888 * If ".." must be changed (ie the directory gets a new
889 * parent) then the source directory must not be in the
890 * directory hierarchy above the target, as this would
891 * orphan everything below the source directory. Also
892 * the user must have write permission in the source so
893 * as to be able to change "..". We must repeat the call
894 * to namei, as the parent directory is unlocked by the
895 * call to checkpath().
896 */
897 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
898 VOP_UNLOCK(fvp, 0);
899 if (oldparent != dp->i_number)
900 newparent = dp->i_number;
901 if (doingdirectory && newparent) {
902 if (error) /* write access check above */
903 goto bad;
904 if (xp != NULL)
905 vput(tvp);
906 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
907 if (error)
908 goto out;
909 VREF(tdvp);
910 error = relookup(tdvp, &tvp, tcnp);
911 if (error)
912 goto out;
913 vrele(tdvp);
914 dp = VTOI(tdvp);
915 xp = NULL;
916 if (tvp)
917 xp = VTOI(tvp);
918 }
919 /*
920 * 2) If target doesn't exist, link the target
921 * to the source and unlink the source.
922 * Otherwise, rewrite the target directory
923 * entry to reference the source inode and
924 * expunge the original entry's existence.
925 */
926 if (xp == NULL) {
927 if (dp->i_devvp != ip->i_devvp)
928 panic("ext2_rename: EXDEV");
929 /*
930 * Account for ".." in new directory.
931 * When source and destination have the same
932 * parent we don't fool with the link count.
933 */
934 if (doingdirectory && newparent) {
935 error = ext2_inc_nlink(dp);
936 if (error)
937 goto bad;
938
939 dp->i_flag |= IN_CHANGE;
940 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
941 if (error)
942 goto bad;
943 }
944 error = ext2_direnter(ip, tdvp, tcnp);
945 if (error) {
946 if (doingdirectory && newparent) {
947 ext2_dec_nlink(dp);
948 dp->i_flag |= IN_CHANGE;
949 (void)ext2_update(tdvp, 1);
950 }
951 goto bad;
952 }
953 vput(tdvp);
954 } else {
955 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
956 panic("ext2_rename: EXDEV");
957 /*
958 * Short circuit rename(foo, foo).
959 */
960 if (xp->i_number == ip->i_number)
961 panic("ext2_rename: same file");
962 /*
963 * If the parent directory is "sticky", then the user must
964 * own the parent directory, or the destination of the rename,
965 * otherwise the destination may not be changed (except by
966 * root). This implements append-only directories.
967 */
968 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
969 tcnp->cn_cred->cr_uid != dp->i_uid &&
970 xp->i_uid != tcnp->cn_cred->cr_uid) {
971 error = EPERM;
972 goto bad;
973 }
974 /*
975 * Target must be empty if a directory and have no links
976 * to it. Also, ensure source and target are compatible
977 * (both directories, or both not directories).
978 */
979 if ((xp->i_mode & IFMT) == IFDIR) {
980 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
981 error = ENOTEMPTY;
982 goto bad;
983 }
984 if (!doingdirectory) {
985 error = ENOTDIR;
986 goto bad;
987 }
988 cache_purge(tdvp);
989 } else if (doingdirectory) {
990 error = EISDIR;
991 goto bad;
992 }
993 error = ext2_dirrewrite(dp, ip, tcnp);
994 if (error)
995 goto bad;
996 /*
997 * If the target directory is in the same
998 * directory as the source directory,
999 * decrement the link count on the parent
1000 * of the target directory.
1001 */
1002 if (doingdirectory && !newparent) {
1003 ext2_dec_nlink(dp);
1004 dp->i_flag |= IN_CHANGE;
1005 }
1006 vput(tdvp);
1007 /*
1008 * Adjust the link count of the target to
1009 * reflect the dirrewrite above. If this is
1010 * a directory it is empty and there are
1011 * no links to it, so we can squash the inode and
1012 * any space associated with it. We disallowed
1013 * renaming over top of a directory with links to
1014 * it above, as the remaining link would point to
1015 * a directory without "." or ".." entries.
1016 */
1017 ext2_dec_nlink(xp);
1018 if (doingdirectory) {
1019 if (--xp->i_nlink != 0)
1020 panic("ext2_rename: linked directory");
1021 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
1022 tcnp->cn_cred, tcnp->cn_thread);
1023 }
1024 xp->i_flag |= IN_CHANGE;
1025 vput(tvp);
1026 xp = NULL;
1027 }
1028
1029 /*
1030 * 3) Unlink the source.
1031 */
1032 fcnp->cn_flags &= ~MODMASK;
1033 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1034 VREF(fdvp);
1035 error = relookup(fdvp, &fvp, fcnp);
1036 if (error == 0)
1037 vrele(fdvp);
1038 if (fvp != NULL) {
1039 xp = VTOI(fvp);
1040 dp = VTOI(fdvp);
1041 } else {
1042 /*
1043 * From name has disappeared. IN_RENAME is not sufficient
1044 * to protect against directory races due to timing windows,
1045 * so we can't panic here.
1046 */
1047 vrele(ap->a_fvp);
1048 return (0);
1049 }
1050 /*
1051 * Ensure that the directory entry still exists and has not
1052 * changed while the new name has been entered. If the source is
1053 * a file then the entry may have been unlinked or renamed. In
1054 * either case there is no further work to be done. If the source
1055 * is a directory then it cannot have been rmdir'ed; its link
1056 * count of three would cause a rmdir to fail with ENOTEMPTY.
1057 * The IN_RENAME flag ensures that it cannot be moved by another
1058 * rename.
1059 */
1060 if (xp != ip) {
1061 /*
1062 * From name resolves to a different inode. IN_RENAME is
1063 * not sufficient protection against timing window races
1064 * so we can't panic here.
1065 */
1066 } else {
1067 /*
1068 * If the source is a directory with a
1069 * new parent, the link count of the old
1070 * parent directory must be decremented
1071 * and ".." set to point to the new parent.
1072 */
1073 if (doingdirectory && newparent) {
1074 ext2_dec_nlink(dp);
1075 dp->i_flag |= IN_CHANGE;
1076 dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO);
1077 if (!dirbuf) {
1078 error = ENOMEM;
1079 goto bad;
1080 }
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 = 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
ext2_do_posix1e_acl_inheritance_dir(struct vnode * dvp,struct vnode * tvp,mode_t dmode,struct ucred * cred,struct thread * td)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
ext2_do_posix1e_acl_inheritance_file(struct vnode * dvp,struct vnode * tvp,mode_t mode,struct ucred * cred,struct thread * td)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
ext2_mkdir(struct vop_mkdir_args * ap)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 #ifdef INVARIANTS
1310 if ((cnp->cn_flags & HASBUF) == 0)
1311 panic("ext2_mkdir: no name");
1312 #endif
1313 dp = VTOI(dvp);
1314 if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX &&
1315 !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
1316 error = EMLINK;
1317 goto out;
1318 }
1319 dmode = vap->va_mode & 0777;
1320 dmode |= IFDIR;
1321 /*
1322 * Must simulate part of ext2_makeinode here to acquire the inode,
1323 * but not have it entered in the parent directory. The entry is
1324 * made later after writing "." and ".." entries.
1325 */
1326 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1327 if (error)
1328 goto out;
1329 ip = VTOI(tvp);
1330 fs = ip->i_e2fs;
1331 ip->i_gid = dp->i_gid;
1332 #ifdef SUIDDIR
1333 {
1334 /*
1335 * if we are hacking owners here, (only do this where told to)
1336 * and we are not giving it TOO root, (would subvert quotas)
1337 * then go ahead and give it to the other user.
1338 * The new directory also inherits the SUID bit.
1339 * If user's UID and dir UID are the same,
1340 * 'give it away' so that the SUID is still forced on.
1341 */
1342 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1343 (dp->i_mode & ISUID) && dp->i_uid) {
1344 dmode |= ISUID;
1345 ip->i_uid = dp->i_uid;
1346 } else {
1347 ip->i_uid = cnp->cn_cred->cr_uid;
1348 }
1349 }
1350 #else
1351 ip->i_uid = cnp->cn_cred->cr_uid;
1352 #endif
1353 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1354 ip->i_mode = dmode;
1355 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1356 ip->i_nlink = 2;
1357 if (cnp->cn_flags & ISWHITEOUT)
1358 ip->i_flags |= UF_OPAQUE;
1359 error = ext2_update(tvp, 1);
1360
1361 /*
1362 * Bump link count in parent directory
1363 * to reflect work done below. Should
1364 * be done before reference is created
1365 * so reparation is possible if we crash.
1366 */
1367 ext2_inc_nlink(dp);
1368 dp->i_flag |= IN_CHANGE;
1369 error = ext2_update(dvp, !DOINGASYNC(dvp));
1370 if (error)
1371 goto bad;
1372
1373 /* Initialize directory with "." and ".." from static template. */
1374 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1375 EXT2F_INCOMPAT_FTYPE))
1376 dtp = &mastertemplate;
1377 else
1378 dtp = &omastertemplate;
1379 dirtemplate = *dtp;
1380 dirtemplate.dot_ino = ip->i_number;
1381 dirtemplate.dotdot_ino = dp->i_number;
1382 /*
1383 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
1384 * just redefine it - for this function only
1385 */
1386 #undef DIRBLKSIZ
1387 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1388 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1389 buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO);
1390 if (!buf) {
1391 error = ENOMEM;
1392 ext2_dec_nlink(dp);
1393 dp->i_flag |= IN_CHANGE;
1394 goto bad;
1395 }
1396 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
1397 dirtemplate.dotdot_reclen -= sizeof(struct ext2fs_direct_tail);
1398 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ));
1399 }
1400 memcpy(buf, &dirtemplate, sizeof(dirtemplate));
1401 ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf);
1402 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf,
1403 DIRBLKSIZ, (off_t)0, UIO_SYSSPACE,
1404 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1405 NULL, NULL);
1406 if (error) {
1407 ext2_dec_nlink(dp);
1408 dp->i_flag |= IN_CHANGE;
1409 goto bad;
1410 }
1411 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1412 /* XXX should grow with balloc() */
1413 panic("ext2_mkdir: blksize");
1414 else {
1415 ip->i_size = DIRBLKSIZ;
1416 ip->i_flag |= IN_CHANGE;
1417 }
1418
1419 #ifdef UFS_ACL
1420 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
1421 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
1422 cnp->cn_cred, cnp->cn_thread);
1423 if (error)
1424 goto bad;
1425 }
1426
1427 #endif /* UFS_ACL */
1428
1429 /* Directory set up, now install its entry in the parent directory. */
1430 error = ext2_direnter(ip, dvp, cnp);
1431 if (error) {
1432 ext2_dec_nlink(dp);
1433 dp->i_flag |= IN_CHANGE;
1434 }
1435 bad:
1436 /*
1437 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1438 * for us because we set the link count to 0.
1439 */
1440 if (error) {
1441 ip->i_nlink = 0;
1442 ip->i_flag |= IN_CHANGE;
1443 vput(tvp);
1444 } else
1445 *ap->a_vpp = tvp;
1446 out:
1447 free(buf, M_TEMP);
1448 return (error);
1449 #undef DIRBLKSIZ
1450 #define DIRBLKSIZ DEV_BSIZE
1451 }
1452
1453 /*
1454 * Rmdir system call.
1455 */
1456 static int
ext2_rmdir(struct vop_rmdir_args * ap)1457 ext2_rmdir(struct vop_rmdir_args *ap)
1458 {
1459 struct vnode *vp = ap->a_vp;
1460 struct vnode *dvp = ap->a_dvp;
1461 struct componentname *cnp = ap->a_cnp;
1462 struct inode *ip, *dp;
1463 int error;
1464
1465 ip = VTOI(vp);
1466 dp = VTOI(dvp);
1467
1468 /*
1469 * Verify the directory is empty (and valid).
1470 * (Rmdir ".." won't be valid since
1471 * ".." will contain a reference to
1472 * the current directory and thus be
1473 * non-empty.)
1474 */
1475 if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1476 error = ENOTEMPTY;
1477 goto out;
1478 }
1479 if ((dp->i_flags & APPEND)
1480 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1481 error = EPERM;
1482 goto out;
1483 }
1484 /*
1485 * Delete reference to directory before purging
1486 * inode. If we crash in between, the directory
1487 * will be reattached to lost+found,
1488 */
1489 error = ext2_dirremove(dvp, cnp);
1490 if (error)
1491 goto out;
1492 ext2_dec_nlink(dp);
1493 dp->i_flag |= IN_CHANGE;
1494 cache_purge(dvp);
1495 VOP_UNLOCK(dvp, 0);
1496 /*
1497 * Truncate inode. The only stuff left
1498 * in the directory is "." and "..".
1499 */
1500 ip->i_nlink = 0;
1501 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1502 cnp->cn_thread);
1503 cache_purge(ITOV(ip));
1504 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1505 VOP_UNLOCK(vp, 0);
1506 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1507 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1508 }
1509 out:
1510 return (error);
1511 }
1512
1513 /*
1514 * symlink -- make a symbolic link
1515 */
1516 static int
ext2_symlink(struct vop_symlink_args * ap)1517 ext2_symlink(struct vop_symlink_args *ap)
1518 {
1519 struct vnode *vp, **vpp = ap->a_vpp;
1520 struct inode *ip;
1521 int len, error;
1522
1523 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1524 vpp, ap->a_cnp);
1525 if (error)
1526 return (error);
1527 vp = *vpp;
1528 len = strlen(ap->a_target);
1529 if (len < vp->v_mount->mnt_maxsymlinklen) {
1530 ip = VTOI(vp);
1531 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1532 ip->i_size = len;
1533 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1534 } else
1535 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1536 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1537 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1538 if (error)
1539 vput(vp);
1540 return (error);
1541 }
1542
1543 /*
1544 * Return target name of a symbolic link
1545 */
1546 static int
ext2_readlink(struct vop_readlink_args * ap)1547 ext2_readlink(struct vop_readlink_args *ap)
1548 {
1549 struct vnode *vp = ap->a_vp;
1550 struct inode *ip = VTOI(vp);
1551 int isize;
1552
1553 isize = ip->i_size;
1554 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1555 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1556 return (0);
1557 }
1558 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1559 }
1560
1561 /*
1562 * Calculate the logical to physical mapping if not done already,
1563 * then call the device strategy routine.
1564 *
1565 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1566 * deadlock on memory. See ext2_bmap() for details.
1567 */
1568 static int
ext2_strategy(struct vop_strategy_args * ap)1569 ext2_strategy(struct vop_strategy_args *ap)
1570 {
1571 struct buf *bp = ap->a_bp;
1572 struct vnode *vp = ap->a_vp;
1573 struct bufobj *bo;
1574 daddr_t blkno;
1575 int error;
1576
1577 if (vp->v_type == VBLK || vp->v_type == VCHR)
1578 panic("ext2_strategy: spec");
1579 if (bp->b_blkno == bp->b_lblkno) {
1580
1581 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS)
1582 error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL);
1583 else
1584 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1585
1586 bp->b_blkno = blkno;
1587 if (error) {
1588 bp->b_error = error;
1589 bp->b_ioflags |= BIO_ERROR;
1590 bufdone(bp);
1591 return (0);
1592 }
1593 if ((long)bp->b_blkno == -1)
1594 vfs_bio_clrbuf(bp);
1595 }
1596 if ((long)bp->b_blkno == -1) {
1597 bufdone(bp);
1598 return (0);
1599 }
1600 bp->b_iooffset = dbtob(bp->b_blkno);
1601 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1602 BO_STRATEGY(bo, bp);
1603 return (0);
1604 }
1605
1606 /*
1607 * Print out the contents of an inode.
1608 */
1609 static int
ext2_print(struct vop_print_args * ap)1610 ext2_print(struct vop_print_args *ap)
1611 {
1612 struct vnode *vp = ap->a_vp;
1613 struct inode *ip = VTOI(vp);
1614
1615 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
1616 if (vp->v_type == VFIFO)
1617 fifo_printinfo(vp);
1618 printf("\n");
1619 return (0);
1620 }
1621
1622 /*
1623 * Close wrapper for fifos.
1624 *
1625 * Update the times on the inode then do device close.
1626 */
1627 static int
ext2fifo_close(struct vop_close_args * ap)1628 ext2fifo_close(struct vop_close_args *ap)
1629 {
1630 struct vnode *vp = ap->a_vp;
1631
1632 VI_LOCK(vp);
1633 if (vp->v_usecount > 1)
1634 ext2_itimes_locked(vp);
1635 VI_UNLOCK(vp);
1636 return (fifo_specops.vop_close(ap));
1637 }
1638
1639 /*
1640 * Kqfilter wrapper for fifos.
1641 *
1642 * Fall through to ext2 kqfilter routines if needed
1643 */
1644 static int
ext2fifo_kqfilter(struct vop_kqfilter_args * ap)1645 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1646 {
1647 int error;
1648
1649 error = fifo_specops.vop_kqfilter(ap);
1650 if (error)
1651 error = vfs_kqfilter(ap);
1652 return (error);
1653 }
1654
1655 /*
1656 * Return POSIX pathconf information applicable to ext2 filesystems.
1657 */
1658 static int
ext2_pathconf(struct vop_pathconf_args * ap)1659 ext2_pathconf(struct vop_pathconf_args *ap)
1660 {
1661 int error = 0;
1662
1663 switch (ap->a_name) {
1664 case _PC_LINK_MAX:
1665 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs,
1666 EXT2F_ROCOMPAT_DIR_NLINK))
1667 *ap->a_retval = INT_MAX;
1668 else
1669 *ap->a_retval = EXT4_LINK_MAX;
1670 break;
1671 case _PC_NAME_MAX:
1672 *ap->a_retval = NAME_MAX;
1673 break;
1674 case _PC_PIPE_BUF:
1675 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
1676 *ap->a_retval = PIPE_BUF;
1677 else
1678 error = EINVAL;
1679 break;
1680 case _PC_CHOWN_RESTRICTED:
1681 *ap->a_retval = 1;
1682 break;
1683 case _PC_NO_TRUNC:
1684 *ap->a_retval = 1;
1685 break;
1686
1687 #ifdef UFS_ACL
1688 case _PC_ACL_EXTENDED:
1689 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1690 *ap->a_retval = 1;
1691 else
1692 *ap->a_retval = 0;
1693 break;
1694 case _PC_ACL_PATH_MAX:
1695 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
1696 *ap->a_retval = ACL_MAX_ENTRIES;
1697 else
1698 *ap->a_retval = 3;
1699 break;
1700 #endif /* UFS_ACL */
1701
1702 case _PC_MIN_HOLE_SIZE:
1703 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1704 break;
1705 case _PC_PRIO_IO:
1706 *ap->a_retval = 0;
1707 break;
1708 case _PC_SYNC_IO:
1709 *ap->a_retval = 0;
1710 break;
1711 case _PC_ALLOC_SIZE_MIN:
1712 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1713 break;
1714 case _PC_FILESIZEBITS:
1715 *ap->a_retval = 64;
1716 break;
1717 case _PC_REC_INCR_XFER_SIZE:
1718 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1719 break;
1720 case _PC_REC_MAX_XFER_SIZE:
1721 *ap->a_retval = -1; /* means ``unlimited'' */
1722 break;
1723 case _PC_REC_MIN_XFER_SIZE:
1724 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1725 break;
1726 case _PC_REC_XFER_ALIGN:
1727 *ap->a_retval = PAGE_SIZE;
1728 break;
1729 case _PC_SYMLINK_MAX:
1730 *ap->a_retval = MAXPATHLEN;
1731 break;
1732
1733 default:
1734 error = vop_stdpathconf(ap);
1735 break;
1736 }
1737 return (error);
1738 }
1739
1740 /*
1741 * Vnode operation to remove a named attribute.
1742 */
1743 static int
ext2_deleteextattr(struct vop_deleteextattr_args * ap)1744 ext2_deleteextattr(struct vop_deleteextattr_args *ap)
1745 {
1746 struct inode *ip;
1747 struct m_ext2fs *fs;
1748 int error;
1749
1750 ip = VTOI(ap->a_vp);
1751 fs = ip->i_e2fs;
1752
1753 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1754 return (EOPNOTSUPP);
1755
1756 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1757 return (EOPNOTSUPP);
1758
1759 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1760 ap->a_cred, ap->a_td, VWRITE);
1761 if (error)
1762 return (error);
1763
1764 error = ENOATTR;
1765
1766 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1767 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name);
1768 if (error != ENOATTR)
1769 return (error);
1770 }
1771
1772 if (ip->i_facl)
1773 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name);
1774
1775 return (error);
1776 }
1777
1778 /*
1779 * Vnode operation to retrieve a named extended attribute.
1780 */
1781 static int
ext2_getextattr(struct vop_getextattr_args * ap)1782 ext2_getextattr(struct vop_getextattr_args *ap)
1783 {
1784 struct inode *ip;
1785 struct m_ext2fs *fs;
1786 int error;
1787
1788 ip = VTOI(ap->a_vp);
1789 fs = ip->i_e2fs;
1790
1791 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1792 return (EOPNOTSUPP);
1793
1794 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1795 return (EOPNOTSUPP);
1796
1797 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1798 ap->a_cred, ap->a_td, VREAD);
1799 if (error)
1800 return (error);
1801
1802 if (ap->a_size != NULL)
1803 *ap->a_size = 0;
1804
1805 error = ENOATTR;
1806
1807 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1808 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace,
1809 ap->a_name, ap->a_uio, ap->a_size);
1810 if (error != ENOATTR)
1811 return (error);
1812 }
1813
1814 if (ip->i_facl)
1815 error = ext2_extattr_block_get(ip, ap->a_attrnamespace,
1816 ap->a_name, ap->a_uio, ap->a_size);
1817
1818 return (error);
1819 }
1820
1821 /*
1822 * Vnode operation to retrieve extended attributes on a vnode.
1823 */
1824 static int
ext2_listextattr(struct vop_listextattr_args * ap)1825 ext2_listextattr(struct vop_listextattr_args *ap)
1826 {
1827 struct inode *ip;
1828 struct m_ext2fs *fs;
1829 int error;
1830
1831 ip = VTOI(ap->a_vp);
1832 fs = ip->i_e2fs;
1833
1834 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1835 return (EOPNOTSUPP);
1836
1837 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1838 return (EOPNOTSUPP);
1839
1840 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1841 ap->a_cred, ap->a_td, VREAD);
1842 if (error)
1843 return (error);
1844
1845 if (ap->a_size != NULL)
1846 *ap->a_size = 0;
1847
1848 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1849 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace,
1850 ap->a_uio, ap->a_size);
1851 if (error)
1852 return (error);
1853 }
1854
1855 if (ip->i_facl)
1856 error = ext2_extattr_block_list(ip, ap->a_attrnamespace,
1857 ap->a_uio, ap->a_size);
1858
1859 return (error);
1860 }
1861
1862 /*
1863 * Vnode operation to set a named attribute.
1864 */
1865 static int
ext2_setextattr(struct vop_setextattr_args * ap)1866 ext2_setextattr(struct vop_setextattr_args *ap)
1867 {
1868 struct inode *ip;
1869 struct m_ext2fs *fs;
1870 int error;
1871
1872 ip = VTOI(ap->a_vp);
1873 fs = ip->i_e2fs;
1874
1875 if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
1876 return (EOPNOTSUPP);
1877
1878 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
1879 return (EOPNOTSUPP);
1880
1881 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1882 ap->a_cred, ap->a_td, VWRITE);
1883 if (error)
1884 return (error);
1885
1886 error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name);
1887 if (error)
1888 return (error);
1889
1890 if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
1891 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace,
1892 ap->a_name, ap->a_uio);
1893 if (error != ENOSPC)
1894 return (error);
1895 }
1896
1897 error = ext2_extattr_block_set(ip, ap->a_attrnamespace,
1898 ap->a_name, ap->a_uio);
1899
1900 return (error);
1901 }
1902
1903 /*
1904 * Vnode pointer to File handle
1905 */
1906 /* ARGSUSED */
1907 static int
ext2_vptofh(struct vop_vptofh_args * ap)1908 ext2_vptofh(struct vop_vptofh_args *ap)
1909 {
1910 struct inode *ip;
1911 struct ufid *ufhp;
1912
1913 ip = VTOI(ap->a_vp);
1914 ufhp = (struct ufid *)ap->a_fhp;
1915 ufhp->ufid_len = sizeof(struct ufid);
1916 ufhp->ufid_ino = ip->i_number;
1917 ufhp->ufid_gen = ip->i_gen;
1918 return (0);
1919 }
1920
1921 /*
1922 * Initialize the vnode associated with a new inode, handle aliased
1923 * vnodes.
1924 */
1925 int
ext2_vinit(struct mount * mntp,struct vop_vector * fifoops,struct vnode ** vpp)1926 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1927 {
1928 struct inode *ip;
1929 struct vnode *vp;
1930
1931 vp = *vpp;
1932 ip = VTOI(vp);
1933 vp->v_type = IFTOVT(ip->i_mode);
1934 /*
1935 * Only unallocated inodes should be of type VNON.
1936 */
1937 if (ip->i_mode != 0 && vp->v_type == VNON)
1938 return (EINVAL);
1939 if (vp->v_type == VFIFO)
1940 vp->v_op = fifoops;
1941
1942 if (ip->i_number == EXT2_ROOTINO)
1943 vp->v_vflag |= VV_ROOT;
1944 ip->i_modrev = init_va_filerev();
1945 *vpp = vp;
1946 return (0);
1947 }
1948
1949 /*
1950 * Allocate a new inode.
1951 */
1952 static int
ext2_makeinode(int mode,struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp)1953 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1954 struct componentname *cnp)
1955 {
1956 struct inode *ip, *pdir;
1957 struct vnode *tvp;
1958 int error;
1959
1960 pdir = VTOI(dvp);
1961 #ifdef INVARIANTS
1962 if ((cnp->cn_flags & HASBUF) == 0)
1963 panic("ext2_makeinode: no name");
1964 #endif
1965 *vpp = NULL;
1966 if ((mode & IFMT) == 0)
1967 mode |= IFREG;
1968
1969 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1970 if (error) {
1971 return (error);
1972 }
1973 ip = VTOI(tvp);
1974 ip->i_gid = pdir->i_gid;
1975 #ifdef SUIDDIR
1976 {
1977 /*
1978 * if we are
1979 * not the owner of the directory,
1980 * and we are hacking owners here, (only do this where told to)
1981 * and we are not giving it TOO root, (would subvert quotas)
1982 * then go ahead and give it to the other user.
1983 * Note that this drops off the execute bits for security.
1984 */
1985 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1986 (pdir->i_mode & ISUID) &&
1987 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1988 ip->i_uid = pdir->i_uid;
1989 mode &= ~07111;
1990 } else {
1991 ip->i_uid = cnp->cn_cred->cr_uid;
1992 }
1993 }
1994 #else
1995 ip->i_uid = cnp->cn_cred->cr_uid;
1996 #endif
1997 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1998 ip->i_mode = mode;
1999 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
2000 ip->i_nlink = 1;
2001 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
2002 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
2003 ip->i_mode &= ~ISGID;
2004 }
2005
2006 if (cnp->cn_flags & ISWHITEOUT)
2007 ip->i_flags |= UF_OPAQUE;
2008
2009 /*
2010 * Make sure inode goes to disk before directory entry.
2011 */
2012 error = ext2_update(tvp, !DOINGASYNC(tvp));
2013 if (error)
2014 goto bad;
2015
2016 #ifdef UFS_ACL
2017 if (dvp->v_mount->mnt_flag & MNT_ACLS) {
2018 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
2019 cnp->cn_cred, cnp->cn_thread);
2020 if (error)
2021 goto bad;
2022 }
2023 #endif /* UFS_ACL */
2024
2025 error = ext2_direnter(ip, dvp, cnp);
2026 if (error)
2027 goto bad;
2028
2029 *vpp = tvp;
2030 return (0);
2031
2032 bad:
2033 /*
2034 * Write error occurred trying to update the inode
2035 * or the directory so must deallocate the inode.
2036 */
2037 ip->i_nlink = 0;
2038 ip->i_flag |= IN_CHANGE;
2039 vput(tvp);
2040 return (error);
2041 }
2042
2043 /*
2044 * Vnode op for reading.
2045 */
2046 static int
ext2_read(struct vop_read_args * ap)2047 ext2_read(struct vop_read_args *ap)
2048 {
2049 struct vnode *vp;
2050 struct inode *ip;
2051 struct uio *uio;
2052 struct m_ext2fs *fs;
2053 struct buf *bp;
2054 daddr_t lbn, nextlbn;
2055 off_t bytesinfile;
2056 long size, xfersize, blkoffset;
2057 int error, orig_resid, seqcount;
2058 int ioflag;
2059
2060 vp = ap->a_vp;
2061 uio = ap->a_uio;
2062 ioflag = ap->a_ioflag;
2063
2064 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
2065 ip = VTOI(vp);
2066
2067 #ifdef INVARIANTS
2068 if (uio->uio_rw != UIO_READ)
2069 panic("%s: mode", "ext2_read");
2070
2071 if (vp->v_type == VLNK) {
2072 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
2073 panic("%s: short symlink", "ext2_read");
2074 } else if (vp->v_type != VREG && vp->v_type != VDIR)
2075 panic("%s: type %d", "ext2_read", vp->v_type);
2076 #endif
2077 orig_resid = uio->uio_resid;
2078 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
2079 if (orig_resid == 0)
2080 return (0);
2081 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
2082 fs = ip->i_e2fs;
2083 if (uio->uio_offset < ip->i_size &&
2084 uio->uio_offset >= fs->e2fs_maxfilesize)
2085 return (EOVERFLOW);
2086
2087 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
2088 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
2089 break;
2090 lbn = lblkno(fs, uio->uio_offset);
2091 nextlbn = lbn + 1;
2092 size = blksize(fs, ip, lbn);
2093 blkoffset = blkoff(fs, uio->uio_offset);
2094
2095 xfersize = fs->e2fs_fsize - blkoffset;
2096 if (uio->uio_resid < xfersize)
2097 xfersize = uio->uio_resid;
2098 if (bytesinfile < xfersize)
2099 xfersize = bytesinfile;
2100
2101 if (lblktosize(fs, nextlbn) >= ip->i_size)
2102 error = bread(vp, lbn, size, NOCRED, &bp);
2103 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
2104 error = cluster_read(vp, ip->i_size, lbn, size,
2105 NOCRED, blkoffset + uio->uio_resid, seqcount,
2106 0, &bp);
2107 } else if (seqcount > 1) {
2108 u_int nextsize = blksize(fs, ip, nextlbn);
2109
2110 error = breadn(vp, lbn,
2111 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
2112 } else
2113 error = bread(vp, lbn, size, NOCRED, &bp);
2114 if (error) {
2115 brelse(bp);
2116 bp = NULL;
2117 break;
2118 }
2119
2120 /*
2121 * We should only get non-zero b_resid when an I/O error
2122 * has occurred, which should cause us to break above.
2123 * However, if the short read did not cause an error,
2124 * then we want to ensure that we do not uiomove bad
2125 * or uninitialized data.
2126 */
2127 size -= bp->b_resid;
2128 if (size < xfersize) {
2129 if (size == 0)
2130 break;
2131 xfersize = size;
2132 }
2133 error = uiomove((char *)bp->b_data + blkoffset,
2134 (int)xfersize, uio);
2135 if (error)
2136 break;
2137 vfs_bio_brelse(bp, ioflag);
2138 }
2139
2140 /*
2141 * This can only happen in the case of an error because the loop
2142 * above resets bp to NULL on each iteration and on normal
2143 * completion has not set a new value into it. so it must have come
2144 * from a 'break' statement
2145 */
2146 if (bp != NULL)
2147 vfs_bio_brelse(bp, ioflag);
2148
2149 if ((error == 0 || uio->uio_resid != orig_resid) &&
2150 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
2151 ip->i_flag |= IN_ACCESS;
2152 return (error);
2153 }
2154
2155 static int
ext2_ioctl(struct vop_ioctl_args * ap)2156 ext2_ioctl(struct vop_ioctl_args *ap)
2157 {
2158
2159 switch (ap->a_command) {
2160 case FIOSEEKDATA:
2161 case FIOSEEKHOLE:
2162 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
2163 (off_t *)ap->a_data, ap->a_cred));
2164 default:
2165 return (ENOTTY);
2166 }
2167 }
2168
2169 /*
2170 * Vnode op for writing.
2171 */
2172 static int
ext2_write(struct vop_write_args * ap)2173 ext2_write(struct vop_write_args *ap)
2174 {
2175 struct vnode *vp;
2176 struct uio *uio;
2177 struct inode *ip;
2178 struct m_ext2fs *fs;
2179 struct buf *bp;
2180 daddr_t lbn;
2181 off_t osize;
2182 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
2183
2184 ioflag = ap->a_ioflag;
2185 uio = ap->a_uio;
2186 vp = ap->a_vp;
2187
2188 seqcount = ioflag >> IO_SEQSHIFT;
2189 ip = VTOI(vp);
2190
2191 #ifdef INVARIANTS
2192 if (uio->uio_rw != UIO_WRITE)
2193 panic("%s: mode", "ext2_write");
2194 #endif
2195
2196 switch (vp->v_type) {
2197 case VREG:
2198 if (ioflag & IO_APPEND)
2199 uio->uio_offset = ip->i_size;
2200 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
2201 return (EPERM);
2202 /* FALLTHROUGH */
2203 case VLNK:
2204 break;
2205 case VDIR:
2206 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
2207 if ((ioflag & IO_SYNC) == 0)
2208 panic("ext2_write: nonsync dir write");
2209 break;
2210 default:
2211 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
2212 vp->v_type, (intmax_t)uio->uio_offset,
2213 (intmax_t)uio->uio_resid);
2214 }
2215
2216 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
2217 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
2218 fs = ip->i_e2fs;
2219 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
2220 return (EFBIG);
2221 /*
2222 * Maybe this should be above the vnode op call, but so long as
2223 * file servers have no limits, I don't think it matters.
2224 */
2225 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
2226 return (EFBIG);
2227
2228 resid = uio->uio_resid;
2229 osize = ip->i_size;
2230 if (seqcount > BA_SEQMAX)
2231 flags = BA_SEQMAX << BA_SEQSHIFT;
2232 else
2233 flags = seqcount << BA_SEQSHIFT;
2234 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
2235 flags |= IO_SYNC;
2236
2237 for (error = 0; uio->uio_resid > 0;) {
2238 lbn = lblkno(fs, uio->uio_offset);
2239 blkoffset = blkoff(fs, uio->uio_offset);
2240 xfersize = fs->e2fs_fsize - blkoffset;
2241 if (uio->uio_resid < xfersize)
2242 xfersize = uio->uio_resid;
2243 if (uio->uio_offset + xfersize > ip->i_size)
2244 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
2245
2246 /*
2247 * We must perform a read-before-write if the transfer size
2248 * does not cover the entire buffer.
2249 */
2250 if (fs->e2fs_bsize > xfersize)
2251 flags |= BA_CLRBUF;
2252 else
2253 flags &= ~BA_CLRBUF;
2254 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
2255 ap->a_cred, &bp, flags);
2256 if (error != 0)
2257 break;
2258
2259 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
2260 bp->b_flags |= B_NOCACHE;
2261 if (uio->uio_offset + xfersize > ip->i_size)
2262 ip->i_size = uio->uio_offset + xfersize;
2263 size = blksize(fs, ip, lbn) - bp->b_resid;
2264 if (size < xfersize)
2265 xfersize = size;
2266
2267 error =
2268 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
2269 /*
2270 * If the buffer is not already filled and we encounter an
2271 * error while trying to fill it, we have to clear out any
2272 * garbage data from the pages instantiated for the buffer.
2273 * If we do not, a failed uiomove() during a write can leave
2274 * the prior contents of the pages exposed to a userland mmap.
2275 *
2276 * Note that we need only clear buffers with a transfer size
2277 * equal to the block size because buffers with a shorter
2278 * transfer size were cleared above by the call to ext2_balloc()
2279 * with the BA_CLRBUF flag set.
2280 *
2281 * If the source region for uiomove identically mmaps the
2282 * buffer, uiomove() performed the NOP copy, and the buffer
2283 * content remains valid because the page fault handler
2284 * validated the pages.
2285 */
2286 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2287 fs->e2fs_bsize == xfersize)
2288 vfs_bio_clrbuf(bp);
2289
2290 vfs_bio_set_flags(bp, ioflag);
2291
2292 /*
2293 * If IO_SYNC each buffer is written synchronously. Otherwise
2294 * if we have a severe page deficiency write the buffer
2295 * asynchronously. Otherwise try to cluster, and if that
2296 * doesn't do it then either do an async write (if O_DIRECT),
2297 * or a delayed write (if not).
2298 */
2299 if (ioflag & IO_SYNC) {
2300 (void)bwrite(bp);
2301 } else if (vm_page_count_severe() ||
2302 buf_dirty_count_severe() ||
2303 (ioflag & IO_ASYNC)) {
2304 bp->b_flags |= B_CLUSTEROK;
2305 bawrite(bp);
2306 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2307 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2308 bp->b_flags |= B_CLUSTEROK;
2309 cluster_write(vp, bp, ip->i_size, seqcount, 0);
2310 } else {
2311 bawrite(bp);
2312 }
2313 } else if (ioflag & IO_DIRECT) {
2314 bp->b_flags |= B_CLUSTEROK;
2315 bawrite(bp);
2316 } else {
2317 bp->b_flags |= B_CLUSTEROK;
2318 bdwrite(bp);
2319 }
2320 if (error || xfersize == 0)
2321 break;
2322 }
2323 /*
2324 * If we successfully wrote any data, and we are not the superuser
2325 * we clear the setuid and setgid bits as a precaution against
2326 * tampering.
2327 */
2328 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2329 ap->a_cred) {
2330 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
2331 ip->i_mode &= ~(ISUID | ISGID);
2332 }
2333 if (error) {
2334 if (ioflag & IO_UNIT) {
2335 (void)ext2_truncate(vp, osize,
2336 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2337 uio->uio_offset -= resid - uio->uio_resid;
2338 uio->uio_resid = resid;
2339 }
2340 }
2341 if (uio->uio_resid != resid) {
2342 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2343 if (ioflag & IO_SYNC)
2344 error = ext2_update(vp, 1);
2345 }
2346 return (error);
2347 }
2348