1 /*-
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 */
7 /*-
8 * Copyright (c) 1982, 1986, 1989, 1993
9 * The Regents of the University of California. All rights reserved.
10 * (c) UNIX System Laboratories, Inc.
11 * All or some portions of this file are derived from material licensed
12 * to the University of California by American Telephone and Telegraph
13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
14 * the permission of UNIX System Laboratories, Inc.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
41 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
42 * $FreeBSD: releng/9.2/sys/fs/ext2fs/ext2_vnops.c 253218 2013-07-11 19:18:13Z pfg $
43 */
44
45 #include "opt_suiddir.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
51 #include <sys/filio.h>
52 #include <sys/stat.h>
53 #include <sys/bio.h>
54 #include <sys/buf.h>
55 #include <sys/endian.h>
56 #include <sys/priv.h>
57 #include <sys/mount.h>
58 #include <sys/unistd.h>
59 #include <sys/time.h>
60 #include <sys/vnode.h>
61 #include <sys/namei.h>
62 #include <sys/lockf.h>
63 #include <sys/event.h>
64 #include <sys/conf.h>
65 #include <sys/file.h>
66
67 #include <vm/vm.h>
68 #include <vm/vm_page.h>
69 #include <vm/vm_object.h>
70 #include <vm/vm_extern.h>
71 #include <vm/vnode_pager.h>
72
73 #include "opt_directio.h"
74
75 #include <fs/fifofs/fifo.h>
76
77 #include <ufs/ufs/dir.h>
78
79 #include <fs/ext2fs/fs.h>
80 #include <fs/ext2fs/inode.h>
81 #include <fs/ext2fs/ext2_extern.h>
82 #include <fs/ext2fs/ext2fs.h>
83 #include <fs/ext2fs/ext2_dinode.h>
84 #include <fs/ext2fs/ext2_dir.h>
85 #include <fs/ext2fs/ext2_mount.h>
86
87 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
88 static void ext2_itimes_locked(struct vnode *);
89
90 static vop_access_t ext2_access;
91 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
92 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
93 struct thread *);
94 static vop_close_t ext2_close;
95 static vop_create_t ext2_create;
96 static vop_fsync_t ext2_fsync;
97 static vop_getattr_t ext2_getattr;
98 static vop_ioctl_t ext2_ioctl;
99 static vop_link_t ext2_link;
100 static vop_mkdir_t ext2_mkdir;
101 static vop_mknod_t ext2_mknod;
102 static vop_open_t ext2_open;
103 static vop_pathconf_t ext2_pathconf;
104 static vop_print_t ext2_print;
105 static vop_read_t ext2_read;
106 static vop_readlink_t ext2_readlink;
107 static vop_remove_t ext2_remove;
108 static vop_rename_t ext2_rename;
109 static vop_rmdir_t ext2_rmdir;
110 static vop_setattr_t ext2_setattr;
111 static vop_strategy_t ext2_strategy;
112 static vop_symlink_t ext2_symlink;
113 static vop_write_t ext2_write;
114 static vop_vptofh_t ext2_vptofh;
115 static vop_close_t ext2fifo_close;
116 static vop_kqfilter_t ext2fifo_kqfilter;
117
118 /* Global vfs data structures for ext2. */
119 struct vop_vector ext2_vnodeops = {
120 .vop_default = &default_vnodeops,
121 .vop_access = ext2_access,
122 .vop_bmap = ext2_bmap,
123 .vop_cachedlookup = ext2_lookup,
124 .vop_close = ext2_close,
125 .vop_create = ext2_create,
126 .vop_fsync = ext2_fsync,
127 .vop_getattr = ext2_getattr,
128 .vop_inactive = ext2_inactive,
129 .vop_ioctl = ext2_ioctl,
130 .vop_link = ext2_link,
131 .vop_lookup = vfs_cache_lookup,
132 .vop_mkdir = ext2_mkdir,
133 .vop_mknod = ext2_mknod,
134 .vop_open = ext2_open,
135 .vop_pathconf = ext2_pathconf,
136 .vop_poll = vop_stdpoll,
137 .vop_print = ext2_print,
138 .vop_read = ext2_read,
139 .vop_readdir = ext2_readdir,
140 .vop_readlink = ext2_readlink,
141 .vop_reallocblks = ext2_reallocblks,
142 .vop_reclaim = ext2_reclaim,
143 .vop_remove = ext2_remove,
144 .vop_rename = ext2_rename,
145 .vop_rmdir = ext2_rmdir,
146 .vop_setattr = ext2_setattr,
147 .vop_strategy = ext2_strategy,
148 .vop_symlink = ext2_symlink,
149 .vop_write = ext2_write,
150 .vop_vptofh = ext2_vptofh,
151 };
152
153 struct vop_vector ext2_fifoops = {
154 .vop_default = &fifo_specops,
155 .vop_access = ext2_access,
156 .vop_close = ext2fifo_close,
157 .vop_fsync = ext2_fsync,
158 .vop_getattr = ext2_getattr,
159 .vop_inactive = ext2_inactive,
160 .vop_kqfilter = ext2fifo_kqfilter,
161 .vop_print = ext2_print,
162 .vop_read = VOP_PANIC,
163 .vop_reclaim = ext2_reclaim,
164 .vop_setattr = ext2_setattr,
165 .vop_write = VOP_PANIC,
166 .vop_vptofh = ext2_vptofh,
167 };
168
169 /*
170 * A virgin directory (no blushing please).
171 * Note that the type and namlen fields are reversed relative to ext2.
172 * Also, we don't use `struct odirtemplate', since it would just cause
173 * endianness problems.
174 */
175 static struct dirtemplate mastertemplate = {
176 0, 12, 1, EXT2_FT_DIR, ".",
177 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
178 };
179 static struct dirtemplate omastertemplate = {
180 0, 12, 1, EXT2_FT_UNKNOWN, ".",
181 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
182 };
183
184 static void
185 ext2_itimes_locked(struct vnode *vp)
186 {
187 struct inode *ip;
188 struct timespec ts;
189
190 ASSERT_VI_LOCKED(vp, __func__);
191
192 ip = VTOI(vp);
193 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
194 return;
195 if ((vp->v_type == VBLK || vp->v_type == VCHR))
196 ip->i_flag |= IN_LAZYMOD;
197 else
198 ip->i_flag |= IN_MODIFIED;
199 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
200 vfs_timestamp(&ts);
201 if (ip->i_flag & IN_ACCESS) {
202 ip->i_atime = ts.tv_sec;
203 ip->i_atimensec = ts.tv_nsec;
204 }
205 if (ip->i_flag & IN_UPDATE) {
206 ip->i_mtime = ts.tv_sec;
207 ip->i_mtimensec = ts.tv_nsec;
208 ip->i_modrev++;
209 }
210 if (ip->i_flag & IN_CHANGE) {
211 ip->i_ctime = ts.tv_sec;
212 ip->i_ctimensec = ts.tv_nsec;
213 }
214 }
215 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
216 }
217
218 void
219 ext2_itimes(struct vnode *vp)
220 {
221
222 VI_LOCK(vp);
223 ext2_itimes_locked(vp);
224 VI_UNLOCK(vp);
225 }
226
227 /*
228 * Create a regular file
229 */
230 static int
231 ext2_create(struct vop_create_args *ap)
232 {
233 int error;
234
235 error =
236 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
237 ap->a_dvp, ap->a_vpp, ap->a_cnp);
238 if (error)
239 return (error);
240 return (0);
241 }
242
243 static int
244 ext2_open(struct vop_open_args *ap)
245 {
246
247 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
248 return (EOPNOTSUPP);
249
250 /*
251 * Files marked append-only must be opened for appending.
252 */
253 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
254 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
255 return (EPERM);
256
257 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
258
259 return (0);
260 }
261
262 /*
263 * Close called.
264 *
265 * Update the times on the inode.
266 */
267 static int
268 ext2_close(struct vop_close_args *ap)
269 {
270 struct vnode *vp = ap->a_vp;
271
272 VI_LOCK(vp);
273 if (vp->v_usecount > 1)
274 ext2_itimes_locked(vp);
275 VI_UNLOCK(vp);
276 return (0);
277 }
278
279 static int
280 ext2_access(struct vop_access_args *ap)
281 {
282 struct vnode *vp = ap->a_vp;
283 struct inode *ip = VTOI(vp);
284 accmode_t accmode = ap->a_accmode;
285 int error;
286
287 if (vp->v_type == VBLK || vp->v_type == VCHR)
288 return (EOPNOTSUPP);
289
290 /*
291 * Disallow write attempts on read-only file systems;
292 * unless the file is a socket, fifo, or a block or
293 * character device resident on the file system.
294 */
295 if (accmode & VWRITE) {
296 switch (vp->v_type) {
297 case VDIR:
298 case VLNK:
299 case VREG:
300 if (vp->v_mount->mnt_flag & MNT_RDONLY)
301 return (EROFS);
302 break;
303 default:
304 break;
305 }
306 }
307
308 /* If immutable bit set, nobody gets to write it. */
309 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
310 return (EPERM);
311
312 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
313 ap->a_accmode, ap->a_cred, NULL);
314 return (error);
315 }
316
317 static int
318 ext2_getattr(struct vop_getattr_args *ap)
319 {
320 struct vnode *vp = ap->a_vp;
321 struct inode *ip = VTOI(vp);
322 struct vattr *vap = ap->a_vap;
323
324 ext2_itimes(vp);
325 /*
326 * Copy from inode table
327 */
328 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
329 vap->va_fileid = ip->i_number;
330 vap->va_mode = ip->i_mode & ~IFMT;
331 vap->va_nlink = ip->i_nlink;
332 vap->va_uid = ip->i_uid;
333 vap->va_gid = ip->i_gid;
334 vap->va_rdev = ip->i_rdev;
335 vap->va_size = ip->i_size;
336 vap->va_atime.tv_sec = ip->i_atime;
337 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
338 vap->va_mtime.tv_sec = ip->i_mtime;
339 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
340 vap->va_ctime.tv_sec = ip->i_ctime;
341 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
342 if E2DI_HAS_XTIME(ip) {
343 vap->va_birthtime.tv_sec = ip->i_birthtime;
344 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
345 }
346 vap->va_flags = ip->i_flags;
347 vap->va_gen = ip->i_gen;
348 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
349 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
350 vap->va_type = IFTOVT(ip->i_mode);
351 vap->va_filerev = ip->i_modrev;
352 return (0);
353 }
354
355 /*
356 * Set attribute vnode op. called from several syscalls
357 */
358 static int
359 ext2_setattr(struct vop_setattr_args *ap)
360 {
361 struct vattr *vap = ap->a_vap;
362 struct vnode *vp = ap->a_vp;
363 struct inode *ip = VTOI(vp);
364 struct ucred *cred = ap->a_cred;
365 struct thread *td = curthread;
366 int error;
367
368 /*
369 * Check for unsettable attributes.
370 */
371 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
372 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
373 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
374 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
375 return (EINVAL);
376 }
377 if (vap->va_flags != VNOVAL) {
378 /* Disallow flags not supported by ext2fs. */
379 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
380 return (EOPNOTSUPP);
381
382 if (vp->v_mount->mnt_flag & MNT_RDONLY)
383 return (EROFS);
384 /*
385 * Callers may only modify the file flags on objects they
386 * have VADMIN rights for.
387 */
388 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
389 return (error);
390 /*
391 * Unprivileged processes and privileged processes in
392 * jail() are not permitted to unset system flags, or
393 * modify flags if any system flags are set.
394 * Privileged non-jail processes may not modify system flags
395 * if securelevel > 0 and any existing system flags are set.
396 */
397 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
398 if (ip->i_flags &
399 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
400 error = securelevel_gt(cred, 0);
401 if (error)
402 return (error);
403 }
404 ip->i_flags = vap->va_flags;
405 } else {
406 if (ip->i_flags &
407 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
408 (vap->va_flags & UF_SETTABLE) != vap->va_flags)
409 return (EPERM);
410 ip->i_flags &= SF_SETTABLE;
411 ip->i_flags |= (vap->va_flags & UF_SETTABLE);
412 }
413 ip->i_flag |= IN_CHANGE;
414 if (ip->i_flags & (IMMUTABLE | APPEND))
415 return (0);
416 }
417 if (ip->i_flags & (IMMUTABLE | APPEND))
418 return (EPERM);
419 /*
420 * Go through the fields and update iff not VNOVAL.
421 */
422 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
423 if (vp->v_mount->mnt_flag & MNT_RDONLY)
424 return (EROFS);
425 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
426 td)) != 0)
427 return (error);
428 }
429 if (vap->va_size != VNOVAL) {
430 /*
431 * Disallow write attempts on read-only file systems;
432 * unless the file is a socket, fifo, or a block or
433 * character device resident on the file system.
434 */
435 switch (vp->v_type) {
436 case VDIR:
437 return (EISDIR);
438 case VLNK:
439 case VREG:
440 if (vp->v_mount->mnt_flag & MNT_RDONLY)
441 return (EROFS);
442 break;
443 default:
444 break;
445 }
446 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
447 return (error);
448 }
449 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
450 if (vp->v_mount->mnt_flag & MNT_RDONLY)
451 return (EROFS);
452 /*
453 * From utimes(2):
454 * If times is NULL, ... The caller must be the owner of
455 * the file, have permission to write the file, or be the
456 * super-user.
457 * If times is non-NULL, ... The caller must be the owner of
458 * the file or be the super-user.
459 */
460 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
461 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
462 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
463 return (error);
464 if (vap->va_atime.tv_sec != VNOVAL)
465 ip->i_flag |= IN_ACCESS;
466 if (vap->va_mtime.tv_sec != VNOVAL)
467 ip->i_flag |= IN_CHANGE | IN_UPDATE;
468 ext2_itimes(vp);
469 if (vap->va_atime.tv_sec != VNOVAL) {
470 ip->i_atime = vap->va_atime.tv_sec;
471 ip->i_atimensec = vap->va_atime.tv_nsec;
472 }
473 if (vap->va_mtime.tv_sec != VNOVAL) {
474 ip->i_mtime = vap->va_mtime.tv_sec;
475 ip->i_mtimensec = vap->va_mtime.tv_nsec;
476 }
477 ip->i_birthtime = vap->va_birthtime.tv_sec;
478 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
479 error = ext2_update(vp, 0);
480 if (error)
481 return (error);
482 }
483 error = 0;
484 if (vap->va_mode != (mode_t)VNOVAL) {
485 if (vp->v_mount->mnt_flag & MNT_RDONLY)
486 return (EROFS);
487 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
488 }
489 return (error);
490 }
491
492 /*
493 * Change the mode on a file.
494 * Inode must be locked before calling.
495 */
496 static int
497 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
498 {
499 struct inode *ip = VTOI(vp);
500 int error;
501
502 /*
503 * To modify the permissions on a file, must possess VADMIN
504 * for that file.
505 */
506 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
507 return (error);
508 /*
509 * Privileged processes may set the sticky bit on non-directories,
510 * as well as set the setgid bit on a file with a group that the
511 * process is not a member of.
512 */
513 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
514 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
515 if (error)
516 return (EFTYPE);
517 }
518 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
519 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
520 if (error)
521 return (error);
522 }
523 ip->i_mode &= ~ALLPERMS;
524 ip->i_mode |= (mode & ALLPERMS);
525 ip->i_flag |= IN_CHANGE;
526 return (0);
527 }
528
529 /*
530 * Perform chown operation on inode ip;
531 * inode must be locked prior to call.
532 */
533 static int
534 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
535 struct thread *td)
536 {
537 struct inode *ip = VTOI(vp);
538 uid_t ouid;
539 gid_t ogid;
540 int error = 0;
541
542 if (uid == (uid_t)VNOVAL)
543 uid = ip->i_uid;
544 if (gid == (gid_t)VNOVAL)
545 gid = ip->i_gid;
546 /*
547 * To modify the ownership of a file, must possess VADMIN
548 * for that file.
549 */
550 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
551 return (error);
552 /*
553 * To change the owner of a file, or change the group of a file
554 * to a group of which we are not a member, the caller must
555 * have privilege.
556 */
557 if (uid != ip->i_uid || (gid != ip->i_gid &&
558 !groupmember(gid, cred))) {
559 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
560 if (error)
561 return (error);
562 }
563 ogid = ip->i_gid;
564 ouid = ip->i_uid;
565 ip->i_gid = gid;
566 ip->i_uid = uid;
567 ip->i_flag |= IN_CHANGE;
568 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
569 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
570 ip->i_mode &= ~(ISUID | ISGID);
571 }
572 return (0);
573 }
574
575 /*
576 * Synch an open file.
577 */
578 /* ARGSUSED */
579 static int
580 ext2_fsync(struct vop_fsync_args *ap)
581 {
582 /*
583 * Flush all dirty buffers associated with a vnode.
584 */
585
586 vop_stdfsync(ap);
587
588 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
589 }
590
591 /*
592 * Mknod vnode call
593 */
594 /* ARGSUSED */
595 static int
596 ext2_mknod(struct vop_mknod_args *ap)
597 {
598 struct vattr *vap = ap->a_vap;
599 struct vnode **vpp = ap->a_vpp;
600 struct inode *ip;
601 ino_t ino;
602 int error;
603
604 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
605 ap->a_dvp, vpp, ap->a_cnp);
606 if (error)
607 return (error);
608 ip = VTOI(*vpp);
609 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
610 if (vap->va_rdev != VNOVAL) {
611 /*
612 * Want to be able to use this to make badblock
613 * inodes, so don't truncate the dev number.
614 */
615 ip->i_rdev = vap->va_rdev;
616 }
617 /*
618 * Remove inode, then reload it through VFS_VGET so it is
619 * checked to see if it is an alias of an existing entry in
620 * the inode cache. XXX I don't believe this is necessary now.
621 */
622 (*vpp)->v_type = VNON;
623 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
624 vgone(*vpp);
625 vput(*vpp);
626 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
627 if (error) {
628 *vpp = NULL;
629 return (error);
630 }
631 return (0);
632 }
633
634 static int
635 ext2_remove(struct vop_remove_args *ap)
636 {
637 struct inode *ip;
638 struct vnode *vp = ap->a_vp;
639 struct vnode *dvp = ap->a_dvp;
640 int error;
641
642 ip = VTOI(vp);
643 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
644 (VTOI(dvp)->i_flags & APPEND)) {
645 error = EPERM;
646 goto out;
647 }
648 error = ext2_dirremove(dvp, ap->a_cnp);
649 if (error == 0) {
650 ip->i_nlink--;
651 ip->i_flag |= IN_CHANGE;
652 }
653 out:
654 return (error);
655 }
656
657 /*
658 * link vnode call
659 */
660 static int
661 ext2_link(struct vop_link_args *ap)
662 {
663 struct vnode *vp = ap->a_vp;
664 struct vnode *tdvp = ap->a_tdvp;
665 struct componentname *cnp = ap->a_cnp;
666 struct inode *ip;
667 int error;
668
669 #ifdef INVARIANTS
670 if ((cnp->cn_flags & HASBUF) == 0)
671 panic("ext2_link: no name");
672 #endif
673 if (tdvp->v_mount != vp->v_mount) {
674 error = EXDEV;
675 goto out;
676 }
677 ip = VTOI(vp);
678 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) {
679 error = EMLINK;
680 goto out;
681 }
682 if (ip->i_flags & (IMMUTABLE | APPEND)) {
683 error = EPERM;
684 goto out;
685 }
686 ip->i_nlink++;
687 ip->i_flag |= IN_CHANGE;
688 error = ext2_update(vp, !DOINGASYNC(vp));
689 if (!error)
690 error = ext2_direnter(ip, tdvp, cnp);
691 if (error) {
692 ip->i_nlink--;
693 ip->i_flag |= IN_CHANGE;
694 }
695 out:
696 return (error);
697 }
698
699 /*
700 * Rename system call.
701 * rename("foo", "bar");
702 * is essentially
703 * unlink("bar");
704 * link("foo", "bar");
705 * unlink("foo");
706 * but ``atomically''. Can't do full commit without saving state in the
707 * inode on disk which isn't feasible at this time. Best we can do is
708 * always guarantee the target exists.
709 *
710 * Basic algorithm is:
711 *
712 * 1) Bump link count on source while we're linking it to the
713 * target. This also ensure the inode won't be deleted out
714 * from underneath us while we work (it may be truncated by
715 * a concurrent `trunc' or `open' for creation).
716 * 2) Link source to destination. If destination already exists,
717 * delete it first.
718 * 3) Unlink source reference to inode if still around. If a
719 * directory was moved and the parent of the destination
720 * is different from the source, patch the ".." entry in the
721 * directory.
722 */
723 static int
724 ext2_rename(struct vop_rename_args *ap)
725 {
726 struct vnode *tvp = ap->a_tvp;
727 struct vnode *tdvp = ap->a_tdvp;
728 struct vnode *fvp = ap->a_fvp;
729 struct vnode *fdvp = ap->a_fdvp;
730 struct componentname *tcnp = ap->a_tcnp;
731 struct componentname *fcnp = ap->a_fcnp;
732 struct inode *ip, *xp, *dp;
733 struct dirtemplate dirbuf;
734 int doingdirectory = 0, oldparent = 0, newparent = 0;
735 int error = 0;
736 u_char namlen;
737
738 #ifdef INVARIANTS
739 if ((tcnp->cn_flags & HASBUF) == 0 ||
740 (fcnp->cn_flags & HASBUF) == 0)
741 panic("ext2_rename: no name");
742 #endif
743 /*
744 * Check for cross-device rename.
745 */
746 if ((fvp->v_mount != tdvp->v_mount) ||
747 (tvp && (fvp->v_mount != tvp->v_mount))) {
748 error = EXDEV;
749 abortit:
750 if (tdvp == tvp)
751 vrele(tdvp);
752 else
753 vput(tdvp);
754 if (tvp)
755 vput(tvp);
756 vrele(fdvp);
757 vrele(fvp);
758 return (error);
759 }
760
761 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
762 (VTOI(tdvp)->i_flags & APPEND))) {
763 error = EPERM;
764 goto abortit;
765 }
766
767 /*
768 * Renaming a file to itself has no effect. The upper layers should
769 * not call us in that case. Temporarily just warn if they do.
770 */
771 if (fvp == tvp) {
772 printf("ext2_rename: fvp == tvp (can't happen)\n");
773 error = 0;
774 goto abortit;
775 }
776
777 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
778 goto abortit;
779 dp = VTOI(fdvp);
780 ip = VTOI(fvp);
781 if (ip->i_nlink >= EXT2_LINK_MAX) {
782 VOP_UNLOCK(fvp, 0);
783 error = EMLINK;
784 goto abortit;
785 }
786 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
787 || (dp->i_flags & APPEND)) {
788 VOP_UNLOCK(fvp, 0);
789 error = EPERM;
790 goto abortit;
791 }
792 if ((ip->i_mode & IFMT) == IFDIR) {
793 /*
794 * Avoid ".", "..", and aliases of "." for obvious reasons.
795 */
796 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
797 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
798 (ip->i_flag & IN_RENAME)) {
799 VOP_UNLOCK(fvp, 0);
800 error = EINVAL;
801 goto abortit;
802 }
803 ip->i_flag |= IN_RENAME;
804 oldparent = dp->i_number;
805 doingdirectory++;
806 }
807 vrele(fdvp);
808
809 /*
810 * When the target exists, both the directory
811 * and target vnodes are returned locked.
812 */
813 dp = VTOI(tdvp);
814 xp = NULL;
815 if (tvp)
816 xp = VTOI(tvp);
817
818 /*
819 * 1) Bump link count while we're moving stuff
820 * around. If we crash somewhere before
821 * completing our work, the link count
822 * may be wrong, but correctable.
823 */
824 ip->i_nlink++;
825 ip->i_flag |= IN_CHANGE;
826 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
827 VOP_UNLOCK(fvp, 0);
828 goto bad;
829 }
830
831 /*
832 * If ".." must be changed (ie the directory gets a new
833 * parent) then the source directory must not be in the
834 * directory hierarchy above the target, as this would
835 * orphan everything below the source directory. Also
836 * the user must have write permission in the source so
837 * as to be able to change "..". We must repeat the call
838 * to namei, as the parent directory is unlocked by the
839 * call to checkpath().
840 */
841 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
842 VOP_UNLOCK(fvp, 0);
843 if (oldparent != dp->i_number)
844 newparent = dp->i_number;
845 if (doingdirectory && newparent) {
846 if (error) /* write access check above */
847 goto bad;
848 if (xp != NULL)
849 vput(tvp);
850 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
851 if (error)
852 goto out;
853 VREF(tdvp);
854 error = relookup(tdvp, &tvp, tcnp);
855 if (error)
856 goto out;
857 vrele(tdvp);
858 dp = VTOI(tdvp);
859 xp = NULL;
860 if (tvp)
861 xp = VTOI(tvp);
862 }
863 /*
864 * 2) If target doesn't exist, link the target
865 * to the source and unlink the source.
866 * Otherwise, rewrite the target directory
867 * entry to reference the source inode and
868 * expunge the original entry's existence.
869 */
870 if (xp == NULL) {
871 if (dp->i_devvp != ip->i_devvp)
872 panic("ext2_rename: EXDEV");
873 /*
874 * Account for ".." in new directory.
875 * When source and destination have the same
876 * parent we don't fool with the link count.
877 */
878 if (doingdirectory && newparent) {
879 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
880 error = EMLINK;
881 goto bad;
882 }
883 dp->i_nlink++;
884 dp->i_flag |= IN_CHANGE;
885 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
886 if (error)
887 goto bad;
888 }
889 error = ext2_direnter(ip, tdvp, tcnp);
890 if (error) {
891 if (doingdirectory && newparent) {
892 dp->i_nlink--;
893 dp->i_flag |= IN_CHANGE;
894 (void)ext2_update(tdvp, 1);
895 }
896 goto bad;
897 }
898 vput(tdvp);
899 } else {
900 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
901 panic("ext2_rename: EXDEV");
902 /*
903 * Short circuit rename(foo, foo).
904 */
905 if (xp->i_number == ip->i_number)
906 panic("ext2_rename: same file");
907 /*
908 * If the parent directory is "sticky", then the user must
909 * own the parent directory, or the destination of the rename,
910 * otherwise the destination may not be changed (except by
911 * root). This implements append-only directories.
912 */
913 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
914 tcnp->cn_cred->cr_uid != dp->i_uid &&
915 xp->i_uid != tcnp->cn_cred->cr_uid) {
916 error = EPERM;
917 goto bad;
918 }
919 /*
920 * Target must be empty if a directory and have no links
921 * to it. Also, ensure source and target are compatible
922 * (both directories, or both not directories).
923 */
924 if ((xp->i_mode&IFMT) == IFDIR) {
925 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
926 xp->i_nlink > 2) {
927 error = ENOTEMPTY;
928 goto bad;
929 }
930 if (!doingdirectory) {
931 error = ENOTDIR;
932 goto bad;
933 }
934 cache_purge(tdvp);
935 } else if (doingdirectory) {
936 error = EISDIR;
937 goto bad;
938 }
939 error = ext2_dirrewrite(dp, ip, tcnp);
940 if (error)
941 goto bad;
942 /*
943 * If the target directory is in the same
944 * directory as the source directory,
945 * decrement the link count on the parent
946 * of the target directory.
947 */
948 if (doingdirectory && !newparent) {
949 dp->i_nlink--;
950 dp->i_flag |= IN_CHANGE;
951 }
952 vput(tdvp);
953 /*
954 * Adjust the link count of the target to
955 * reflect the dirrewrite above. If this is
956 * a directory it is empty and there are
957 * no links to it, so we can squash the inode and
958 * any space associated with it. We disallowed
959 * renaming over top of a directory with links to
960 * it above, as the remaining link would point to
961 * a directory without "." or ".." entries.
962 */
963 xp->i_nlink--;
964 if (doingdirectory) {
965 if (--xp->i_nlink != 0)
966 panic("ext2_rename: linked directory");
967 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
968 tcnp->cn_cred, tcnp->cn_thread);
969 }
970 xp->i_flag |= IN_CHANGE;
971 vput(tvp);
972 xp = NULL;
973 }
974
975 /*
976 * 3) Unlink the source.
977 */
978 fcnp->cn_flags &= ~MODMASK;
979 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
980 VREF(fdvp);
981 error = relookup(fdvp, &fvp, fcnp);
982 if (error == 0)
983 vrele(fdvp);
984 if (fvp != NULL) {
985 xp = VTOI(fvp);
986 dp = VTOI(fdvp);
987 } else {
988 /*
989 * From name has disappeared.
990 */
991 if (doingdirectory)
992 panic("ext2_rename: lost dir entry");
993 vrele(ap->a_fvp);
994 return (0);
995 }
996 /*
997 * Ensure that the directory entry still exists and has not
998 * changed while the new name has been entered. If the source is
999 * a file then the entry may have been unlinked or renamed. In
1000 * either case there is no further work to be done. If the source
1001 * is a directory then it cannot have been rmdir'ed; its link
1002 * count of three would cause a rmdir to fail with ENOTEMPTY.
1003 * The IN_RENAME flag ensures that it cannot be moved by another
1004 * rename.
1005 */
1006 if (xp != ip) {
1007 if (doingdirectory)
1008 panic("ext2_rename: lost dir entry");
1009 } else {
1010 /*
1011 * If the source is a directory with a
1012 * new parent, the link count of the old
1013 * parent directory must be decremented
1014 * and ".." set to point to the new parent.
1015 */
1016 if (doingdirectory && newparent) {
1017 dp->i_nlink--;
1018 dp->i_flag |= IN_CHANGE;
1019 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
1020 sizeof(struct dirtemplate), (off_t)0,
1021 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1022 tcnp->cn_cred, NOCRED, NULL, NULL);
1023 if (error == 0) {
1024 /* Like ufs little-endian: */
1025 namlen = dirbuf.dotdot_type;
1026 if (namlen != 2 ||
1027 dirbuf.dotdot_name[0] != '.' ||
1028 dirbuf.dotdot_name[1] != '.') {
1029 ext2_dirbad(xp, (doff_t)12,
1030 "rename: mangled dir");
1031 } else {
1032 dirbuf.dotdot_ino = newparent;
1033 (void) vn_rdwr(UIO_WRITE, fvp,
1034 (caddr_t)&dirbuf,
1035 sizeof(struct dirtemplate),
1036 (off_t)0, UIO_SYSSPACE,
1037 IO_NODELOCKED | IO_SYNC |
1038 IO_NOMACCHECK, tcnp->cn_cred,
1039 NOCRED, NULL, NULL);
1040 cache_purge(fdvp);
1041 }
1042 }
1043 }
1044 error = ext2_dirremove(fdvp, fcnp);
1045 if (!error) {
1046 xp->i_nlink--;
1047 xp->i_flag |= IN_CHANGE;
1048 }
1049 xp->i_flag &= ~IN_RENAME;
1050 }
1051 if (dp)
1052 vput(fdvp);
1053 if (xp)
1054 vput(fvp);
1055 vrele(ap->a_fvp);
1056 return (error);
1057
1058 bad:
1059 if (xp)
1060 vput(ITOV(xp));
1061 vput(ITOV(dp));
1062 out:
1063 if (doingdirectory)
1064 ip->i_flag &= ~IN_RENAME;
1065 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1066 ip->i_nlink--;
1067 ip->i_flag |= IN_CHANGE;
1068 ip->i_flag &= ~IN_RENAME;
1069 vput(fvp);
1070 } else
1071 vrele(fvp);
1072 return (error);
1073 }
1074
1075 /*
1076 * Mkdir system call
1077 */
1078 static int
1079 ext2_mkdir(struct vop_mkdir_args *ap)
1080 {
1081 struct vnode *dvp = ap->a_dvp;
1082 struct vattr *vap = ap->a_vap;
1083 struct componentname *cnp = ap->a_cnp;
1084 struct inode *ip, *dp;
1085 struct vnode *tvp;
1086 struct dirtemplate dirtemplate, *dtp;
1087 int error, dmode;
1088
1089 #ifdef INVARIANTS
1090 if ((cnp->cn_flags & HASBUF) == 0)
1091 panic("ext2_mkdir: no name");
1092 #endif
1093 dp = VTOI(dvp);
1094 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
1095 error = EMLINK;
1096 goto out;
1097 }
1098 dmode = vap->va_mode & 0777;
1099 dmode |= IFDIR;
1100 /*
1101 * Must simulate part of ext2_makeinode here to acquire the inode,
1102 * but not have it entered in the parent directory. The entry is
1103 * made later after writing "." and ".." entries.
1104 */
1105 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1106 if (error)
1107 goto out;
1108 ip = VTOI(tvp);
1109 ip->i_gid = dp->i_gid;
1110 #ifdef SUIDDIR
1111 {
1112 /*
1113 * if we are hacking owners here, (only do this where told to)
1114 * and we are not giving it TOO root, (would subvert quotas)
1115 * then go ahead and give it to the other user.
1116 * The new directory also inherits the SUID bit.
1117 * If user's UID and dir UID are the same,
1118 * 'give it away' so that the SUID is still forced on.
1119 */
1120 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1121 (dp->i_mode & ISUID) && dp->i_uid) {
1122 dmode |= ISUID;
1123 ip->i_uid = dp->i_uid;
1124 } else {
1125 ip->i_uid = cnp->cn_cred->cr_uid;
1126 }
1127 }
1128 #else
1129 ip->i_uid = cnp->cn_cred->cr_uid;
1130 #endif
1131 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1132 ip->i_mode = dmode;
1133 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1134 ip->i_nlink = 2;
1135 if (cnp->cn_flags & ISWHITEOUT)
1136 ip->i_flags |= UF_OPAQUE;
1137 error = ext2_update(tvp, 1);
1138
1139 /*
1140 * Bump link count in parent directory
1141 * to reflect work done below. Should
1142 * be done before reference is created
1143 * so reparation is possible if we crash.
1144 */
1145 dp->i_nlink++;
1146 dp->i_flag |= IN_CHANGE;
1147 error = ext2_update(dvp, !DOINGASYNC(dvp));
1148 if (error)
1149 goto bad;
1150
1151 /* Initialize directory with "." and ".." from static template. */
1152 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1153 EXT2F_INCOMPAT_FTYPE))
1154 dtp = &mastertemplate;
1155 else
1156 dtp = &omastertemplate;
1157 dirtemplate = *dtp;
1158 dirtemplate.dot_ino = ip->i_number;
1159 dirtemplate.dotdot_ino = dp->i_number;
1160 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
1161 * so let's just redefine it - for this function only
1162 */
1163 #undef DIRBLKSIZ
1164 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1165 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1166 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
1167 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE,
1168 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1169 NULL, NULL);
1170 if (error) {
1171 dp->i_nlink--;
1172 dp->i_flag |= IN_CHANGE;
1173 goto bad;
1174 }
1175 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1176 /* XXX should grow with balloc() */
1177 panic("ext2_mkdir: blksize");
1178 else {
1179 ip->i_size = DIRBLKSIZ;
1180 ip->i_flag |= IN_CHANGE;
1181 }
1182
1183 /* Directory set up, now install its entry in the parent directory. */
1184 error = ext2_direnter(ip, dvp, cnp);
1185 if (error) {
1186 dp->i_nlink--;
1187 dp->i_flag |= IN_CHANGE;
1188 }
1189 bad:
1190 /*
1191 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1192 * for us because we set the link count to 0.
1193 */
1194 if (error) {
1195 ip->i_nlink = 0;
1196 ip->i_flag |= IN_CHANGE;
1197 vput(tvp);
1198 } else
1199 *ap->a_vpp = tvp;
1200 out:
1201 return (error);
1202 #undef DIRBLKSIZ
1203 #define DIRBLKSIZ DEV_BSIZE
1204 }
1205
1206 /*
1207 * Rmdir system call.
1208 */
1209 static int
1210 ext2_rmdir(struct vop_rmdir_args *ap)
1211 {
1212 struct vnode *vp = ap->a_vp;
1213 struct vnode *dvp = ap->a_dvp;
1214 struct componentname *cnp = ap->a_cnp;
1215 struct inode *ip, *dp;
1216 int error;
1217
1218 ip = VTOI(vp);
1219 dp = VTOI(dvp);
1220
1221 /*
1222 * Verify the directory is empty (and valid).
1223 * (Rmdir ".." won't be valid since
1224 * ".." will contain a reference to
1225 * the current directory and thus be
1226 * non-empty.)
1227 */
1228 error = 0;
1229 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1230 error = ENOTEMPTY;
1231 goto out;
1232 }
1233 if ((dp->i_flags & APPEND)
1234 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1235 error = EPERM;
1236 goto out;
1237 }
1238 /*
1239 * Delete reference to directory before purging
1240 * inode. If we crash in between, the directory
1241 * will be reattached to lost+found,
1242 */
1243 error = ext2_dirremove(dvp, cnp);
1244 if (error)
1245 goto out;
1246 dp->i_nlink--;
1247 dp->i_flag |= IN_CHANGE;
1248 cache_purge(dvp);
1249 VOP_UNLOCK(dvp, 0);
1250 /*
1251 * Truncate inode. The only stuff left
1252 * in the directory is "." and "..". The
1253 * "." reference is inconsequential since
1254 * we're quashing it. The ".." reference
1255 * has already been adjusted above. We've
1256 * removed the "." reference and the reference
1257 * in the parent directory, but there may be
1258 * other hard links so decrement by 2 and
1259 * worry about them later.
1260 */
1261 ip->i_nlink -= 2;
1262 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1263 cnp->cn_thread);
1264 cache_purge(ITOV(ip));
1265 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1266 VOP_UNLOCK(vp, 0);
1267 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1268 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1269 }
1270 out:
1271 return (error);
1272 }
1273
1274 /*
1275 * symlink -- make a symbolic link
1276 */
1277 static int
1278 ext2_symlink(struct vop_symlink_args *ap)
1279 {
1280 struct vnode *vp, **vpp = ap->a_vpp;
1281 struct inode *ip;
1282 int len, error;
1283
1284 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1285 vpp, ap->a_cnp);
1286 if (error)
1287 return (error);
1288 vp = *vpp;
1289 len = strlen(ap->a_target);
1290 if (len < vp->v_mount->mnt_maxsymlinklen) {
1291 ip = VTOI(vp);
1292 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1293 ip->i_size = len;
1294 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1295 } else
1296 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1297 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1298 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1299 if (error)
1300 vput(vp);
1301 return (error);
1302 }
1303
1304 /*
1305 * Return target name of a symbolic link
1306 */
1307 static int
1308 ext2_readlink(struct vop_readlink_args *ap)
1309 {
1310 struct vnode *vp = ap->a_vp;
1311 struct inode *ip = VTOI(vp);
1312 int isize;
1313
1314 isize = ip->i_size;
1315 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1316 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1317 return (0);
1318 }
1319 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1320 }
1321
1322 /*
1323 * Calculate the logical to physical mapping if not done already,
1324 * then call the device strategy routine.
1325 *
1326 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1327 * deadlock on memory. See ext2_bmap() for details.
1328 */
1329 static int
1330 ext2_strategy(struct vop_strategy_args *ap)
1331 {
1332 struct buf *bp = ap->a_bp;
1333 struct vnode *vp = ap->a_vp;
1334 struct inode *ip;
1335 struct bufobj *bo;
1336 int32_t blkno;
1337 int error;
1338
1339 ip = VTOI(vp);
1340 if (vp->v_type == VBLK || vp->v_type == VCHR)
1341 panic("ext2_strategy: spec");
1342 if (bp->b_blkno == bp->b_lblkno) {
1343 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1344 bp->b_blkno = blkno;
1345 if (error) {
1346 bp->b_error = error;
1347 bp->b_ioflags |= BIO_ERROR;
1348 bufdone(bp);
1349 return (0);
1350 }
1351 if ((long)bp->b_blkno == -1)
1352 vfs_bio_clrbuf(bp);
1353 }
1354 if ((long)bp->b_blkno == -1) {
1355 bufdone(bp);
1356 return (0);
1357 }
1358 bp->b_iooffset = dbtob(bp->b_blkno);
1359 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1360 BO_STRATEGY(bo, bp);
1361 return (0);
1362 }
1363
1364 /*
1365 * Print out the contents of an inode.
1366 */
1367 static int
1368 ext2_print(struct vop_print_args *ap)
1369 {
1370 struct vnode *vp = ap->a_vp;
1371 struct inode *ip = VTOI(vp);
1372
1373 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number);
1374 if (vp->v_type == VFIFO)
1375 fifo_printinfo(vp);
1376 printf("\n");
1377 return (0);
1378 }
1379
1380 /*
1381 * Close wrapper for fifos.
1382 *
1383 * Update the times on the inode then do device close.
1384 */
1385 static int
1386 ext2fifo_close(struct vop_close_args *ap)
1387 {
1388 struct vnode *vp = ap->a_vp;
1389
1390 VI_LOCK(vp);
1391 if (vp->v_usecount > 1)
1392 ext2_itimes_locked(vp);
1393 VI_UNLOCK(vp);
1394 return (fifo_specops.vop_close(ap));
1395 }
1396
1397 /*
1398 * Kqfilter wrapper for fifos.
1399 *
1400 * Fall through to ext2 kqfilter routines if needed
1401 */
1402 static int
1403 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1404 {
1405 int error;
1406
1407 error = fifo_specops.vop_kqfilter(ap);
1408 if (error)
1409 error = vfs_kqfilter(ap);
1410 return (error);
1411 }
1412
1413 /*
1414 * Return POSIX pathconf information applicable to ext2 filesystems.
1415 */
1416 static int
1417 ext2_pathconf(struct vop_pathconf_args *ap)
1418 {
1419
1420 switch (ap->a_name) {
1421 case _PC_LINK_MAX:
1422 *ap->a_retval = EXT2_LINK_MAX;
1423 return (0);
1424 case _PC_NAME_MAX:
1425 *ap->a_retval = NAME_MAX;
1426 return (0);
1427 case _PC_PATH_MAX:
1428 *ap->a_retval = PATH_MAX;
1429 return (0);
1430 case _PC_PIPE_BUF:
1431 *ap->a_retval = PIPE_BUF;
1432 return (0);
1433 case _PC_CHOWN_RESTRICTED:
1434 *ap->a_retval = 1;
1435 return (0);
1436 case _PC_NO_TRUNC:
1437 *ap->a_retval = 1;
1438 return (0);
1439 case _PC_MIN_HOLE_SIZE:
1440 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1441 return(0);
1442 default:
1443 return (EINVAL);
1444 }
1445 /* NOTREACHED */
1446 }
1447
1448 /*
1449 * Vnode pointer to File handle
1450 */
1451 /* ARGSUSED */
1452 static int
1453 ext2_vptofh(struct vop_vptofh_args *ap)
1454 {
1455 struct inode *ip;
1456 struct ufid *ufhp;
1457
1458 ip = VTOI(ap->a_vp);
1459 ufhp = (struct ufid *)ap->a_fhp;
1460 ufhp->ufid_len = sizeof(struct ufid);
1461 ufhp->ufid_ino = ip->i_number;
1462 ufhp->ufid_gen = ip->i_gen;
1463 return (0);
1464 }
1465
1466 /*
1467 * Initialize the vnode associated with a new inode, handle aliased
1468 * vnodes.
1469 */
1470 int
1471 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1472 {
1473 struct inode *ip;
1474 struct vnode *vp;
1475
1476 vp = *vpp;
1477 ip = VTOI(vp);
1478 vp->v_type = IFTOVT(ip->i_mode);
1479 if (vp->v_type == VFIFO)
1480 vp->v_op = fifoops;
1481
1482 if (ip->i_number == EXT2_ROOTINO)
1483 vp->v_vflag |= VV_ROOT;
1484 ip->i_modrev = init_va_filerev();
1485 *vpp = vp;
1486 return (0);
1487 }
1488
1489 /*
1490 * Allocate a new inode.
1491 */
1492 static int
1493 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1494 struct componentname *cnp)
1495 {
1496 struct inode *ip, *pdir;
1497 struct vnode *tvp;
1498 int error;
1499
1500 pdir = VTOI(dvp);
1501 #ifdef INVARIANTS
1502 if ((cnp->cn_flags & HASBUF) == 0)
1503 panic("ext2_makeinode: no name");
1504 #endif
1505 *vpp = NULL;
1506 if ((mode & IFMT) == 0)
1507 mode |= IFREG;
1508
1509 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1510 if (error) {
1511 return (error);
1512 }
1513 ip = VTOI(tvp);
1514 ip->i_gid = pdir->i_gid;
1515 #ifdef SUIDDIR
1516 {
1517 /*
1518 * if we are
1519 * not the owner of the directory,
1520 * and we are hacking owners here, (only do this where told to)
1521 * and we are not giving it TOO root, (would subvert quotas)
1522 * then go ahead and give it to the other user.
1523 * Note that this drops off the execute bits for security.
1524 */
1525 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1526 (pdir->i_mode & ISUID) &&
1527 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1528 ip->i_uid = pdir->i_uid;
1529 mode &= ~07111;
1530 } else {
1531 ip->i_uid = cnp->cn_cred->cr_uid;
1532 }
1533 }
1534 #else
1535 ip->i_uid = cnp->cn_cred->cr_uid;
1536 #endif
1537 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1538 ip->i_mode = mode;
1539 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1540 ip->i_nlink = 1;
1541 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1542 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
1543 ip->i_mode &= ~ISGID;
1544 }
1545
1546 if (cnp->cn_flags & ISWHITEOUT)
1547 ip->i_flags |= UF_OPAQUE;
1548
1549 /*
1550 * Make sure inode goes to disk before directory entry.
1551 */
1552 error = ext2_update(tvp, !DOINGASYNC(tvp));
1553 if (error)
1554 goto bad;
1555 error = ext2_direnter(ip, dvp, cnp);
1556 if (error)
1557 goto bad;
1558
1559 *vpp = tvp;
1560 return (0);
1561
1562 bad:
1563 /*
1564 * Write error occurred trying to update the inode
1565 * or the directory so must deallocate the inode.
1566 */
1567 ip->i_nlink = 0;
1568 ip->i_flag |= IN_CHANGE;
1569 vput(tvp);
1570 return (error);
1571 }
1572
1573 /*
1574 * Vnode op for reading.
1575 */
1576 static int
1577 ext2_read(struct vop_read_args *ap)
1578 {
1579 struct vnode *vp;
1580 struct inode *ip;
1581 struct uio *uio;
1582 struct m_ext2fs *fs;
1583 struct buf *bp;
1584 daddr_t lbn, nextlbn;
1585 off_t bytesinfile;
1586 long size, xfersize, blkoffset;
1587 int error, orig_resid, seqcount;
1588 int ioflag;
1589
1590 vp = ap->a_vp;
1591 uio = ap->a_uio;
1592 ioflag = ap->a_ioflag;
1593
1594 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
1595 ip = VTOI(vp);
1596
1597 #ifdef INVARIANTS
1598 if (uio->uio_rw != UIO_READ)
1599 panic("%s: mode", "ext2_read");
1600
1601 if (vp->v_type == VLNK) {
1602 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
1603 panic("%s: short symlink", "ext2_read");
1604 } else if (vp->v_type != VREG && vp->v_type != VDIR)
1605 panic("%s: type %d", "ext2_read", vp->v_type);
1606 #endif
1607 orig_resid = uio->uio_resid;
1608 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
1609 if (orig_resid == 0)
1610 return (0);
1611 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
1612 fs = ip->i_e2fs;
1613 if (uio->uio_offset < ip->i_size &&
1614 uio->uio_offset >= fs->e2fs_maxfilesize)
1615 return (EOVERFLOW);
1616
1617 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
1618 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1619 break;
1620 lbn = lblkno(fs, uio->uio_offset);
1621 nextlbn = lbn + 1;
1622 size = blksize(fs, ip, lbn);
1623 blkoffset = blkoff(fs, uio->uio_offset);
1624
1625 xfersize = fs->e2fs_fsize - blkoffset;
1626 if (uio->uio_resid < xfersize)
1627 xfersize = uio->uio_resid;
1628 if (bytesinfile < xfersize)
1629 xfersize = bytesinfile;
1630
1631 if (lblktosize(fs, nextlbn) >= ip->i_size)
1632 error = bread(vp, lbn, size, NOCRED, &bp);
1633 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0)
1634 error = cluster_read(vp, ip->i_size, lbn, size,
1635 NOCRED, blkoffset + uio->uio_resid, seqcount, &bp);
1636 else if (seqcount > 1) {
1637 int nextsize = blksize(fs, ip, nextlbn);
1638 error = breadn(vp, lbn,
1639 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
1640 } else
1641 error = bread(vp, lbn, size, NOCRED, &bp);
1642 if (error) {
1643 brelse(bp);
1644 bp = NULL;
1645 break;
1646 }
1647
1648 /*
1649 * If IO_DIRECT then set B_DIRECT for the buffer. This
1650 * will cause us to attempt to release the buffer later on
1651 * and will cause the buffer cache to attempt to free the
1652 * underlying pages.
1653 */
1654 if (ioflag & IO_DIRECT)
1655 bp->b_flags |= B_DIRECT;
1656
1657 /*
1658 * We should only get non-zero b_resid when an I/O error
1659 * has occurred, which should cause us to break above.
1660 * However, if the short read did not cause an error,
1661 * then we want to ensure that we do not uiomove bad
1662 * or uninitialized data.
1663 */
1664 size -= bp->b_resid;
1665 if (size < xfersize) {
1666 if (size == 0)
1667 break;
1668 xfersize = size;
1669 }
1670 error = uiomove((char *)bp->b_data + blkoffset,
1671 (int)xfersize, uio);
1672 if (error)
1673 break;
1674
1675 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1676 /*
1677 * If it's VMIO or direct I/O, then we don't
1678 * need the buf, mark it available for
1679 * freeing. If it's non-direct VMIO, the VM has
1680 * the data.
1681 */
1682 bp->b_flags |= B_RELBUF;
1683 brelse(bp);
1684 } else {
1685 /*
1686 * Otherwise let whoever
1687 * made the request take care of
1688 * freeing it. We just queue
1689 * it onto another list.
1690 */
1691 bqrelse(bp);
1692 }
1693 }
1694
1695 /*
1696 * This can only happen in the case of an error
1697 * because the loop above resets bp to NULL on each iteration
1698 * and on normal completion has not set a new value into it.
1699 * so it must have come from a 'break' statement
1700 */
1701 if (bp != NULL) {
1702 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1703 bp->b_flags |= B_RELBUF;
1704 brelse(bp);
1705 } else {
1706 bqrelse(bp);
1707 }
1708 }
1709
1710 if ((error == 0 || uio->uio_resid != orig_resid) &&
1711 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
1712 ip->i_flag |= IN_ACCESS;
1713 return (error);
1714 }
1715
1716 static int
1717 ext2_ioctl(struct vop_ioctl_args *ap)
1718 {
1719
1720 switch (ap->a_command) {
1721 case FIOSEEKDATA:
1722 case FIOSEEKHOLE:
1723 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
1724 (off_t *)ap->a_data, ap->a_cred));
1725 default:
1726 return (ENOTTY);
1727 }
1728 }
1729
1730 /*
1731 * Vnode op for writing.
1732 */
1733 static int
1734 ext2_write(struct vop_write_args *ap)
1735 {
1736 struct vnode *vp;
1737 struct uio *uio;
1738 struct inode *ip;
1739 struct m_ext2fs *fs;
1740 struct buf *bp;
1741 daddr_t lbn;
1742 off_t osize;
1743 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
1744
1745 ioflag = ap->a_ioflag;
1746 uio = ap->a_uio;
1747 vp = ap->a_vp;
1748
1749 seqcount = ioflag >> IO_SEQSHIFT;
1750 ip = VTOI(vp);
1751
1752 #ifdef INVARIANTS
1753 if (uio->uio_rw != UIO_WRITE)
1754 panic("%s: mode", "ext2_write");
1755 #endif
1756
1757 switch (vp->v_type) {
1758 case VREG:
1759 if (ioflag & IO_APPEND)
1760 uio->uio_offset = ip->i_size;
1761 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
1762 return (EPERM);
1763 /* FALLTHROUGH */
1764 case VLNK:
1765 break;
1766 case VDIR:
1767 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
1768 if ((ioflag & IO_SYNC) == 0)
1769 panic("ext2_write: nonsync dir write");
1770 break;
1771 default:
1772 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
1773 vp->v_type, (intmax_t)uio->uio_offset,
1774 (intmax_t)uio->uio_resid);
1775 }
1776
1777 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
1778 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
1779 fs = ip->i_e2fs;
1780 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
1781 return (EFBIG);
1782 /*
1783 * Maybe this should be above the vnode op call, but so long as
1784 * file servers have no limits, I don't think it matters.
1785 */
1786 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
1787 return (EFBIG);
1788
1789 resid = uio->uio_resid;
1790 osize = ip->i_size;
1791 if (seqcount > BA_SEQMAX)
1792 flags = BA_SEQMAX << BA_SEQSHIFT;
1793 else
1794 flags = seqcount << BA_SEQSHIFT;
1795 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
1796 flags |= IO_SYNC;
1797
1798 for (error = 0; uio->uio_resid > 0;) {
1799 lbn = lblkno(fs, uio->uio_offset);
1800 blkoffset = blkoff(fs, uio->uio_offset);
1801 xfersize = fs->e2fs_fsize - blkoffset;
1802 if (uio->uio_resid < xfersize)
1803 xfersize = uio->uio_resid;
1804 if (uio->uio_offset + xfersize > ip->i_size)
1805 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
1806
1807 /*
1808 * We must perform a read-before-write if the transfer size
1809 * does not cover the entire buffer.
1810 */
1811 if (fs->e2fs_bsize > xfersize)
1812 flags |= BA_CLRBUF;
1813 else
1814 flags &= ~BA_CLRBUF;
1815 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
1816 ap->a_cred, &bp, flags);
1817 if (error != 0)
1818 break;
1819
1820 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
1821 bp->b_flags |= B_NOCACHE;
1822 if (uio->uio_offset + xfersize > ip->i_size)
1823 ip->i_size = uio->uio_offset + xfersize;
1824 size = blksize(fs, ip, lbn) - bp->b_resid;
1825 if (size < xfersize)
1826 xfersize = size;
1827
1828 error =
1829 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
1830 /*
1831 * If the buffer is not already filled and we encounter an
1832 * error while trying to fill it, we have to clear out any
1833 * garbage data from the pages instantiated for the buffer.
1834 * If we do not, a failed uiomove() during a write can leave
1835 * the prior contents of the pages exposed to a userland mmap.
1836 *
1837 * Note that we need only clear buffers with a transfer size
1838 * equal to the block size because buffers with a shorter
1839 * transfer size were cleared above by the call to ext2_balloc()
1840 * with the BA_CLRBUF flag set.
1841 *
1842 * If the source region for uiomove identically mmaps the
1843 * buffer, uiomove() performed the NOP copy, and the buffer
1844 * content remains valid because the page fault handler
1845 * validated the pages.
1846 */
1847 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
1848 fs->e2fs_bsize == xfersize)
1849 vfs_bio_clrbuf(bp);
1850 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1851 bp->b_flags |= B_RELBUF;
1852 }
1853
1854 /*
1855 * If IO_SYNC each buffer is written synchronously. Otherwise
1856 * if we have a severe page deficiency write the buffer
1857 * asynchronously. Otherwise try to cluster, and if that
1858 * doesn't do it then either do an async write (if O_DIRECT),
1859 * or a delayed write (if not).
1860 */
1861 if (ioflag & IO_SYNC) {
1862 (void)bwrite(bp);
1863 } else if (vm_page_count_severe() ||
1864 buf_dirty_count_severe() ||
1865 (ioflag & IO_ASYNC)) {
1866 bp->b_flags |= B_CLUSTEROK;
1867 bawrite(bp);
1868 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
1869 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
1870 bp->b_flags |= B_CLUSTEROK;
1871 cluster_write(vp, bp, ip->i_size, seqcount);
1872 } else {
1873 bawrite(bp);
1874 }
1875 } else if (ioflag & IO_DIRECT) {
1876 bp->b_flags |= B_CLUSTEROK;
1877 bawrite(bp);
1878 } else {
1879 bp->b_flags |= B_CLUSTEROK;
1880 bdwrite(bp);
1881 }
1882 if (error || xfersize == 0)
1883 break;
1884 }
1885 /*
1886 * If we successfully wrote any data, and we are not the superuser
1887 * we clear the setuid and setgid bits as a precaution against
1888 * tampering.
1889 */
1890 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
1891 ap->a_cred) {
1892 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
1893 ip->i_mode &= ~(ISUID | ISGID);
1894 }
1895 if (error) {
1896 if (ioflag & IO_UNIT) {
1897 (void)ext2_truncate(vp, osize,
1898 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
1899 uio->uio_offset -= resid - uio->uio_resid;
1900 uio->uio_resid = resid;
1901 }
1902 }
1903 if (uio->uio_resid != resid) {
1904 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1905 if (ioflag & IO_SYNC)
1906 error = ext2_update(vp, 1);
1907 }
1908 return (error);
1909 }
Cache object: 74985797dcabedd327dd7cd65b8d2f12
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