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/11.1/sys/fs/ext2fs/ext2_vnops.c 311231 2017-01-04 02:42:17Z pfg $
43 */
44
45 #include "opt_suiddir.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
51 #include <sys/filio.h>
52 #include <sys/stat.h>
53 #include <sys/bio.h>
54 #include <sys/buf.h>
55 #include <sys/endian.h>
56 #include <sys/priv.h>
57 #include <sys/rwlock.h>
58 #include <sys/mount.h>
59 #include <sys/unistd.h>
60 #include <sys/time.h>
61 #include <sys/vnode.h>
62 #include <sys/namei.h>
63 #include <sys/lockf.h>
64 #include <sys/event.h>
65 #include <sys/conf.h>
66 #include <sys/file.h>
67
68 #include <vm/vm.h>
69 #include <vm/vm_param.h>
70 #include <vm/vm_extern.h>
71 #include <vm/vm_object.h>
72 #include <vm/vm_page.h>
73 #include <vm/vm_pager.h>
74 #include <vm/vnode_pager.h>
75
76 #include "opt_directio.h"
77
78 #include <ufs/ufs/dir.h>
79
80 #include <fs/ext2fs/fs.h>
81 #include <fs/ext2fs/inode.h>
82 #include <fs/ext2fs/ext2_extern.h>
83 #include <fs/ext2fs/ext2fs.h>
84 #include <fs/ext2fs/ext2_dinode.h>
85 #include <fs/ext2fs/ext2_dir.h>
86 #include <fs/ext2fs/ext2_mount.h>
87
88 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
89 static void ext2_itimes_locked(struct vnode *);
90 static int ext4_ext_read(struct vop_read_args *);
91 static int ext2_ind_read(struct vop_read_args *);
92
93 static vop_access_t ext2_access;
94 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
95 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
96 struct thread *);
97 static vop_close_t ext2_close;
98 static vop_create_t ext2_create;
99 static vop_fsync_t ext2_fsync;
100 static vop_getattr_t ext2_getattr;
101 static vop_ioctl_t ext2_ioctl;
102 static vop_link_t ext2_link;
103 static vop_mkdir_t ext2_mkdir;
104 static vop_mknod_t ext2_mknod;
105 static vop_open_t ext2_open;
106 static vop_pathconf_t ext2_pathconf;
107 static vop_print_t ext2_print;
108 static vop_read_t ext2_read;
109 static vop_readlink_t ext2_readlink;
110 static vop_remove_t ext2_remove;
111 static vop_rename_t ext2_rename;
112 static vop_rmdir_t ext2_rmdir;
113 static vop_setattr_t ext2_setattr;
114 static vop_strategy_t ext2_strategy;
115 static vop_symlink_t ext2_symlink;
116 static vop_write_t ext2_write;
117 static vop_vptofh_t ext2_vptofh;
118 static vop_close_t ext2fifo_close;
119 static vop_kqfilter_t ext2fifo_kqfilter;
120
121 /* Global vfs data structures for ext2. */
122 struct vop_vector ext2_vnodeops = {
123 .vop_default = &default_vnodeops,
124 .vop_access = ext2_access,
125 .vop_bmap = ext2_bmap,
126 .vop_cachedlookup = ext2_lookup,
127 .vop_close = ext2_close,
128 .vop_create = ext2_create,
129 .vop_fsync = ext2_fsync,
130 .vop_getpages = vnode_pager_local_getpages,
131 .vop_getpages_async = vnode_pager_local_getpages_async,
132 .vop_getattr = ext2_getattr,
133 .vop_inactive = ext2_inactive,
134 .vop_ioctl = ext2_ioctl,
135 .vop_link = ext2_link,
136 .vop_lookup = vfs_cache_lookup,
137 .vop_mkdir = ext2_mkdir,
138 .vop_mknod = ext2_mknod,
139 .vop_open = ext2_open,
140 .vop_pathconf = ext2_pathconf,
141 .vop_poll = vop_stdpoll,
142 .vop_print = ext2_print,
143 .vop_read = ext2_read,
144 .vop_readdir = ext2_readdir,
145 .vop_readlink = ext2_readlink,
146 .vop_reallocblks = ext2_reallocblks,
147 .vop_reclaim = ext2_reclaim,
148 .vop_remove = ext2_remove,
149 .vop_rename = ext2_rename,
150 .vop_rmdir = ext2_rmdir,
151 .vop_setattr = ext2_setattr,
152 .vop_strategy = ext2_strategy,
153 .vop_symlink = ext2_symlink,
154 .vop_write = ext2_write,
155 .vop_vptofh = ext2_vptofh,
156 };
157
158 struct vop_vector ext2_fifoops = {
159 .vop_default = &fifo_specops,
160 .vop_access = ext2_access,
161 .vop_close = ext2fifo_close,
162 .vop_fsync = ext2_fsync,
163 .vop_getattr = ext2_getattr,
164 .vop_inactive = ext2_inactive,
165 .vop_kqfilter = ext2fifo_kqfilter,
166 .vop_print = ext2_print,
167 .vop_read = VOP_PANIC,
168 .vop_reclaim = ext2_reclaim,
169 .vop_setattr = ext2_setattr,
170 .vop_write = VOP_PANIC,
171 .vop_vptofh = ext2_vptofh,
172 };
173
174 /*
175 * A virgin directory (no blushing please).
176 * Note that the type and namlen fields are reversed relative to ext2.
177 * Also, we don't use `struct odirtemplate', since it would just cause
178 * endianness problems.
179 */
180 static struct dirtemplate mastertemplate = {
181 0, 12, 1, EXT2_FT_DIR, ".",
182 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
183 };
184 static struct dirtemplate omastertemplate = {
185 0, 12, 1, EXT2_FT_UNKNOWN, ".",
186 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
187 };
188
189 static void
190 ext2_itimes_locked(struct vnode *vp)
191 {
192 struct inode *ip;
193 struct timespec ts;
194
195 ASSERT_VI_LOCKED(vp, __func__);
196
197 ip = VTOI(vp);
198 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
199 return;
200 if ((vp->v_type == VBLK || vp->v_type == VCHR))
201 ip->i_flag |= IN_LAZYMOD;
202 else
203 ip->i_flag |= IN_MODIFIED;
204 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
205 vfs_timestamp(&ts);
206 if (ip->i_flag & IN_ACCESS) {
207 ip->i_atime = ts.tv_sec;
208 ip->i_atimensec = ts.tv_nsec;
209 }
210 if (ip->i_flag & IN_UPDATE) {
211 ip->i_mtime = ts.tv_sec;
212 ip->i_mtimensec = ts.tv_nsec;
213 ip->i_modrev++;
214 }
215 if (ip->i_flag & IN_CHANGE) {
216 ip->i_ctime = ts.tv_sec;
217 ip->i_ctimensec = ts.tv_nsec;
218 }
219 }
220 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
221 }
222
223 void
224 ext2_itimes(struct vnode *vp)
225 {
226
227 VI_LOCK(vp);
228 ext2_itimes_locked(vp);
229 VI_UNLOCK(vp);
230 }
231
232 /*
233 * Create a regular file
234 */
235 static int
236 ext2_create(struct vop_create_args *ap)
237 {
238 int error;
239
240 error =
241 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
242 ap->a_dvp, ap->a_vpp, ap->a_cnp);
243 if (error != 0)
244 return (error);
245 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
246 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
247 return (0);
248 }
249
250 static int
251 ext2_open(struct vop_open_args *ap)
252 {
253
254 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
255 return (EOPNOTSUPP);
256
257 /*
258 * Files marked append-only must be opened for appending.
259 */
260 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
261 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
262 return (EPERM);
263
264 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
265
266 return (0);
267 }
268
269 /*
270 * Close called.
271 *
272 * Update the times on the inode.
273 */
274 static int
275 ext2_close(struct vop_close_args *ap)
276 {
277 struct vnode *vp = ap->a_vp;
278
279 VI_LOCK(vp);
280 if (vp->v_usecount > 1)
281 ext2_itimes_locked(vp);
282 VI_UNLOCK(vp);
283 return (0);
284 }
285
286 static int
287 ext2_access(struct vop_access_args *ap)
288 {
289 struct vnode *vp = ap->a_vp;
290 struct inode *ip = VTOI(vp);
291 accmode_t accmode = ap->a_accmode;
292 int error;
293
294 if (vp->v_type == VBLK || vp->v_type == VCHR)
295 return (EOPNOTSUPP);
296
297 /*
298 * Disallow write attempts on read-only file systems;
299 * unless the file is a socket, fifo, or a block or
300 * character device resident on the file system.
301 */
302 if (accmode & VWRITE) {
303 switch (vp->v_type) {
304 case VDIR:
305 case VLNK:
306 case VREG:
307 if (vp->v_mount->mnt_flag & MNT_RDONLY)
308 return (EROFS);
309 break;
310 default:
311 break;
312 }
313 }
314
315 /* If immutable bit set, nobody gets to write it. */
316 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
317 return (EPERM);
318
319 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
320 ap->a_accmode, ap->a_cred, NULL);
321 return (error);
322 }
323
324 static int
325 ext2_getattr(struct vop_getattr_args *ap)
326 {
327 struct vnode *vp = ap->a_vp;
328 struct inode *ip = VTOI(vp);
329 struct vattr *vap = ap->a_vap;
330
331 ext2_itimes(vp);
332 /*
333 * Copy from inode table
334 */
335 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
336 vap->va_fileid = ip->i_number;
337 vap->va_mode = ip->i_mode & ~IFMT;
338 vap->va_nlink = ip->i_nlink;
339 vap->va_uid = ip->i_uid;
340 vap->va_gid = ip->i_gid;
341 vap->va_rdev = ip->i_rdev;
342 vap->va_size = ip->i_size;
343 vap->va_atime.tv_sec = ip->i_atime;
344 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
345 vap->va_mtime.tv_sec = ip->i_mtime;
346 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
347 vap->va_ctime.tv_sec = ip->i_ctime;
348 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
349 if E2DI_HAS_XTIME(ip) {
350 vap->va_birthtime.tv_sec = ip->i_birthtime;
351 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
352 }
353 vap->va_flags = ip->i_flags;
354 vap->va_gen = ip->i_gen;
355 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
356 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
357 vap->va_type = IFTOVT(ip->i_mode);
358 vap->va_filerev = ip->i_modrev;
359 return (0);
360 }
361
362 /*
363 * Set attribute vnode op. called from several syscalls
364 */
365 static int
366 ext2_setattr(struct vop_setattr_args *ap)
367 {
368 struct vattr *vap = ap->a_vap;
369 struct vnode *vp = ap->a_vp;
370 struct inode *ip = VTOI(vp);
371 struct ucred *cred = ap->a_cred;
372 struct thread *td = curthread;
373 int error;
374
375 /*
376 * Check for unsettable attributes.
377 */
378 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
379 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
380 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
381 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
382 return (EINVAL);
383 }
384 if (vap->va_flags != VNOVAL) {
385 /* Disallow flags not supported by ext2fs. */
386 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
387 return (EOPNOTSUPP);
388
389 if (vp->v_mount->mnt_flag & MNT_RDONLY)
390 return (EROFS);
391 /*
392 * Callers may only modify the file flags on objects they
393 * have VADMIN rights for.
394 */
395 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
396 return (error);
397 /*
398 * Unprivileged processes and privileged processes in
399 * jail() are not permitted to unset system flags, or
400 * modify flags if any system flags are set.
401 * Privileged non-jail processes may not modify system flags
402 * if securelevel > 0 and any existing system flags are set.
403 */
404 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
405 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
406 error = securelevel_gt(cred, 0);
407 if (error)
408 return (error);
409 }
410 } else {
411 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
412 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
413 return (EPERM);
414 }
415 ip->i_flags = vap->va_flags;
416 ip->i_flag |= IN_CHANGE;
417 if (ip->i_flags & (IMMUTABLE | APPEND))
418 return (0);
419 }
420 if (ip->i_flags & (IMMUTABLE | APPEND))
421 return (EPERM);
422 /*
423 * Go through the fields and update iff not VNOVAL.
424 */
425 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
426 if (vp->v_mount->mnt_flag & MNT_RDONLY)
427 return (EROFS);
428 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
429 td)) != 0)
430 return (error);
431 }
432 if (vap->va_size != VNOVAL) {
433 /*
434 * Disallow write attempts on read-only file systems;
435 * unless the file is a socket, fifo, or a block or
436 * character device resident on the file system.
437 */
438 switch (vp->v_type) {
439 case VDIR:
440 return (EISDIR);
441 case VLNK:
442 case VREG:
443 if (vp->v_mount->mnt_flag & MNT_RDONLY)
444 return (EROFS);
445 break;
446 default:
447 break;
448 }
449 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
450 return (error);
451 }
452 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
453 if (vp->v_mount->mnt_flag & MNT_RDONLY)
454 return (EROFS);
455 /*
456 * From utimes(2):
457 * If times is NULL, ... The caller must be the owner of
458 * the file, have permission to write the file, or be the
459 * super-user.
460 * If times is non-NULL, ... The caller must be the owner of
461 * the file or be the super-user.
462 */
463 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
464 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
465 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
466 return (error);
467 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
468 if (vap->va_atime.tv_sec != VNOVAL) {
469 ip->i_flag &= ~IN_ACCESS;
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_flag &= ~IN_UPDATE;
475 ip->i_mtime = vap->va_mtime.tv_sec;
476 ip->i_mtimensec = vap->va_mtime.tv_nsec;
477 }
478 ip->i_birthtime = vap->va_birthtime.tv_sec;
479 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
480 error = ext2_update(vp, 0);
481 if (error)
482 return (error);
483 }
484 error = 0;
485 if (vap->va_mode != (mode_t)VNOVAL) {
486 if (vp->v_mount->mnt_flag & MNT_RDONLY)
487 return (EROFS);
488 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
489 }
490 return (error);
491 }
492
493 /*
494 * Change the mode on a file.
495 * Inode must be locked before calling.
496 */
497 static int
498 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
499 {
500 struct inode *ip = VTOI(vp);
501 int error;
502
503 /*
504 * To modify the permissions on a file, must possess VADMIN
505 * for that file.
506 */
507 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
508 return (error);
509 /*
510 * Privileged processes may set the sticky bit on non-directories,
511 * as well as set the setgid bit on a file with a group that the
512 * process is not a member of.
513 */
514 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
515 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
516 if (error)
517 return (EFTYPE);
518 }
519 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
520 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
521 if (error)
522 return (error);
523 }
524 ip->i_mode &= ~ALLPERMS;
525 ip->i_mode |= (mode & ALLPERMS);
526 ip->i_flag |= IN_CHANGE;
527 return (0);
528 }
529
530 /*
531 * Perform chown operation on inode ip;
532 * inode must be locked prior to call.
533 */
534 static int
535 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
536 struct thread *td)
537 {
538 struct inode *ip = VTOI(vp);
539 uid_t ouid;
540 gid_t ogid;
541 int error = 0;
542
543 if (uid == (uid_t)VNOVAL)
544 uid = ip->i_uid;
545 if (gid == (gid_t)VNOVAL)
546 gid = ip->i_gid;
547 /*
548 * To modify the ownership of a file, must possess VADMIN
549 * for that file.
550 */
551 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
552 return (error);
553 /*
554 * To change the owner of a file, or change the group of a file
555 * to a group of which we are not a member, the caller must
556 * have privilege.
557 */
558 if (uid != ip->i_uid || (gid != ip->i_gid &&
559 !groupmember(gid, cred))) {
560 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
561 if (error)
562 return (error);
563 }
564 ogid = ip->i_gid;
565 ouid = ip->i_uid;
566 ip->i_gid = gid;
567 ip->i_uid = uid;
568 ip->i_flag |= IN_CHANGE;
569 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
570 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
571 ip->i_mode &= ~(ISUID | ISGID);
572 }
573 return (0);
574 }
575
576 /*
577 * Synch an open file.
578 */
579 /* ARGSUSED */
580 static int
581 ext2_fsync(struct vop_fsync_args *ap)
582 {
583 /*
584 * Flush all dirty buffers associated with a vnode.
585 */
586
587 vop_stdfsync(ap);
588
589 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
590 }
591
592 /*
593 * Mknod vnode call
594 */
595 /* ARGSUSED */
596 static int
597 ext2_mknod(struct vop_mknod_args *ap)
598 {
599 struct vattr *vap = ap->a_vap;
600 struct vnode **vpp = ap->a_vpp;
601 struct inode *ip;
602 ino_t ino;
603 int error;
604
605 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
606 ap->a_dvp, vpp, ap->a_cnp);
607 if (error)
608 return (error);
609 ip = VTOI(*vpp);
610 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
611 if (vap->va_rdev != VNOVAL) {
612 /*
613 * Want to be able to use this to make badblock
614 * inodes, so don't truncate the dev number.
615 */
616 ip->i_rdev = vap->va_rdev;
617 }
618 /*
619 * Remove inode, then reload it through VFS_VGET so it is
620 * checked to see if it is an alias of an existing entry in
621 * the inode cache. XXX I don't believe this is necessary now.
622 */
623 (*vpp)->v_type = VNON;
624 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
625 vgone(*vpp);
626 vput(*vpp);
627 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
628 if (error) {
629 *vpp = NULL;
630 return (error);
631 }
632 return (0);
633 }
634
635 static int
636 ext2_remove(struct vop_remove_args *ap)
637 {
638 struct inode *ip;
639 struct vnode *vp = ap->a_vp;
640 struct vnode *dvp = ap->a_dvp;
641 int error;
642
643 ip = VTOI(vp);
644 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
645 (VTOI(dvp)->i_flags & APPEND)) {
646 error = EPERM;
647 goto out;
648 }
649 error = ext2_dirremove(dvp, ap->a_cnp);
650 if (error == 0) {
651 ip->i_nlink--;
652 ip->i_flag |= IN_CHANGE;
653 }
654 out:
655 return (error);
656 }
657
658 /*
659 * link vnode call
660 */
661 static int
662 ext2_link(struct vop_link_args *ap)
663 {
664 struct vnode *vp = ap->a_vp;
665 struct vnode *tdvp = ap->a_tdvp;
666 struct componentname *cnp = ap->a_cnp;
667 struct inode *ip;
668 int error;
669
670 #ifdef INVARIANTS
671 if ((cnp->cn_flags & HASBUF) == 0)
672 panic("ext2_link: no name");
673 #endif
674 ip = VTOI(vp);
675 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) {
676 error = EMLINK;
677 goto out;
678 }
679 if (ip->i_flags & (IMMUTABLE | APPEND)) {
680 error = EPERM;
681 goto out;
682 }
683 ip->i_nlink++;
684 ip->i_flag |= IN_CHANGE;
685 error = ext2_update(vp, !DOINGASYNC(vp));
686 if (!error)
687 error = ext2_direnter(ip, tdvp, cnp);
688 if (error) {
689 ip->i_nlink--;
690 ip->i_flag |= IN_CHANGE;
691 }
692 out:
693 return (error);
694 }
695
696 /*
697 * Rename system call.
698 * rename("foo", "bar");
699 * is essentially
700 * unlink("bar");
701 * link("foo", "bar");
702 * unlink("foo");
703 * but ``atomically''. Can't do full commit without saving state in the
704 * inode on disk which isn't feasible at this time. Best we can do is
705 * always guarantee the target exists.
706 *
707 * Basic algorithm is:
708 *
709 * 1) Bump link count on source while we're linking it to the
710 * target. This also ensure the inode won't be deleted out
711 * from underneath us while we work (it may be truncated by
712 * a concurrent `trunc' or `open' for creation).
713 * 2) Link source to destination. If destination already exists,
714 * delete it first.
715 * 3) Unlink source reference to inode if still around. If a
716 * directory was moved and the parent of the destination
717 * is different from the source, patch the ".." entry in the
718 * directory.
719 */
720 static int
721 ext2_rename(struct vop_rename_args *ap)
722 {
723 struct vnode *tvp = ap->a_tvp;
724 struct vnode *tdvp = ap->a_tdvp;
725 struct vnode *fvp = ap->a_fvp;
726 struct vnode *fdvp = ap->a_fdvp;
727 struct componentname *tcnp = ap->a_tcnp;
728 struct componentname *fcnp = ap->a_fcnp;
729 struct inode *ip, *xp, *dp;
730 struct dirtemplate dirbuf;
731 int doingdirectory = 0, oldparent = 0, newparent = 0;
732 int error = 0;
733 u_char namlen;
734
735 #ifdef INVARIANTS
736 if ((tcnp->cn_flags & HASBUF) == 0 ||
737 (fcnp->cn_flags & HASBUF) == 0)
738 panic("ext2_rename: no name");
739 #endif
740 /*
741 * Check for cross-device rename.
742 */
743 if ((fvp->v_mount != tdvp->v_mount) ||
744 (tvp && (fvp->v_mount != tvp->v_mount))) {
745 error = EXDEV;
746 abortit:
747 if (tdvp == tvp)
748 vrele(tdvp);
749 else
750 vput(tdvp);
751 if (tvp)
752 vput(tvp);
753 vrele(fdvp);
754 vrele(fvp);
755 return (error);
756 }
757
758 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
759 (VTOI(tdvp)->i_flags & APPEND))) {
760 error = EPERM;
761 goto abortit;
762 }
763
764 /*
765 * Renaming a file to itself has no effect. The upper layers should
766 * not call us in that case. Temporarily just warn if they do.
767 */
768 if (fvp == tvp) {
769 printf("ext2_rename: fvp == tvp (can't happen)\n");
770 error = 0;
771 goto abortit;
772 }
773
774 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
775 goto abortit;
776 dp = VTOI(fdvp);
777 ip = VTOI(fvp);
778 if (ip->i_nlink >= EXT2_LINK_MAX) {
779 VOP_UNLOCK(fvp, 0);
780 error = EMLINK;
781 goto abortit;
782 }
783 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
784 || (dp->i_flags & APPEND)) {
785 VOP_UNLOCK(fvp, 0);
786 error = EPERM;
787 goto abortit;
788 }
789 if ((ip->i_mode & IFMT) == IFDIR) {
790 /*
791 * Avoid ".", "..", and aliases of "." for obvious reasons.
792 */
793 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
794 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
795 (ip->i_flag & IN_RENAME)) {
796 VOP_UNLOCK(fvp, 0);
797 error = EINVAL;
798 goto abortit;
799 }
800 ip->i_flag |= IN_RENAME;
801 oldparent = dp->i_number;
802 doingdirectory++;
803 }
804 vrele(fdvp);
805
806 /*
807 * When the target exists, both the directory
808 * and target vnodes are returned locked.
809 */
810 dp = VTOI(tdvp);
811 xp = NULL;
812 if (tvp)
813 xp = VTOI(tvp);
814
815 /*
816 * 1) Bump link count while we're moving stuff
817 * around. If we crash somewhere before
818 * completing our work, the link count
819 * may be wrong, but correctable.
820 */
821 ip->i_nlink++;
822 ip->i_flag |= IN_CHANGE;
823 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
824 VOP_UNLOCK(fvp, 0);
825 goto bad;
826 }
827
828 /*
829 * If ".." must be changed (ie the directory gets a new
830 * parent) then the source directory must not be in the
831 * directory hierarchy above the target, as this would
832 * orphan everything below the source directory. Also
833 * the user must have write permission in the source so
834 * as to be able to change "..". We must repeat the call
835 * to namei, as the parent directory is unlocked by the
836 * call to checkpath().
837 */
838 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
839 VOP_UNLOCK(fvp, 0);
840 if (oldparent != dp->i_number)
841 newparent = dp->i_number;
842 if (doingdirectory && newparent) {
843 if (error) /* write access check above */
844 goto bad;
845 if (xp != NULL)
846 vput(tvp);
847 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
848 if (error)
849 goto out;
850 VREF(tdvp);
851 error = relookup(tdvp, &tvp, tcnp);
852 if (error)
853 goto out;
854 vrele(tdvp);
855 dp = VTOI(tdvp);
856 xp = NULL;
857 if (tvp)
858 xp = VTOI(tvp);
859 }
860 /*
861 * 2) If target doesn't exist, link the target
862 * to the source and unlink the source.
863 * Otherwise, rewrite the target directory
864 * entry to reference the source inode and
865 * expunge the original entry's existence.
866 */
867 if (xp == NULL) {
868 if (dp->i_devvp != ip->i_devvp)
869 panic("ext2_rename: EXDEV");
870 /*
871 * Account for ".." in new directory.
872 * When source and destination have the same
873 * parent we don't fool with the link count.
874 */
875 if (doingdirectory && newparent) {
876 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
877 error = EMLINK;
878 goto bad;
879 }
880 dp->i_nlink++;
881 dp->i_flag |= IN_CHANGE;
882 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
883 if (error)
884 goto bad;
885 }
886 error = ext2_direnter(ip, tdvp, tcnp);
887 if (error) {
888 if (doingdirectory && newparent) {
889 dp->i_nlink--;
890 dp->i_flag |= IN_CHANGE;
891 (void)ext2_update(tdvp, 1);
892 }
893 goto bad;
894 }
895 vput(tdvp);
896 } else {
897 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
898 panic("ext2_rename: EXDEV");
899 /*
900 * Short circuit rename(foo, foo).
901 */
902 if (xp->i_number == ip->i_number)
903 panic("ext2_rename: same file");
904 /*
905 * If the parent directory is "sticky", then the user must
906 * own the parent directory, or the destination of the rename,
907 * otherwise the destination may not be changed (except by
908 * root). This implements append-only directories.
909 */
910 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
911 tcnp->cn_cred->cr_uid != dp->i_uid &&
912 xp->i_uid != tcnp->cn_cred->cr_uid) {
913 error = EPERM;
914 goto bad;
915 }
916 /*
917 * Target must be empty if a directory and have no links
918 * to it. Also, ensure source and target are compatible
919 * (both directories, or both not directories).
920 */
921 if ((xp->i_mode & IFMT) == IFDIR) {
922 if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
923 xp->i_nlink > 2) {
924 error = ENOTEMPTY;
925 goto bad;
926 }
927 if (!doingdirectory) {
928 error = ENOTDIR;
929 goto bad;
930 }
931 cache_purge(tdvp);
932 } else if (doingdirectory) {
933 error = EISDIR;
934 goto bad;
935 }
936 error = ext2_dirrewrite(dp, ip, tcnp);
937 if (error)
938 goto bad;
939 /*
940 * If the target directory is in the same
941 * directory as the source directory,
942 * decrement the link count on the parent
943 * of the target directory.
944 */
945 if (doingdirectory && !newparent) {
946 dp->i_nlink--;
947 dp->i_flag |= IN_CHANGE;
948 }
949 vput(tdvp);
950 /*
951 * Adjust the link count of the target to
952 * reflect the dirrewrite above. If this is
953 * a directory it is empty and there are
954 * no links to it, so we can squash the inode and
955 * any space associated with it. We disallowed
956 * renaming over top of a directory with links to
957 * it above, as the remaining link would point to
958 * a directory without "." or ".." entries.
959 */
960 xp->i_nlink--;
961 if (doingdirectory) {
962 if (--xp->i_nlink != 0)
963 panic("ext2_rename: linked directory");
964 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
965 tcnp->cn_cred, tcnp->cn_thread);
966 }
967 xp->i_flag |= IN_CHANGE;
968 vput(tvp);
969 xp = NULL;
970 }
971
972 /*
973 * 3) Unlink the source.
974 */
975 fcnp->cn_flags &= ~MODMASK;
976 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
977 VREF(fdvp);
978 error = relookup(fdvp, &fvp, fcnp);
979 if (error == 0)
980 vrele(fdvp);
981 if (fvp != NULL) {
982 xp = VTOI(fvp);
983 dp = VTOI(fdvp);
984 } else {
985 /*
986 * From name has disappeared. IN_RENAME is not sufficient
987 * to protect against directory races due to timing windows,
988 * so we can't panic here.
989 */
990 vrele(ap->a_fvp);
991 return (0);
992 }
993 /*
994 * Ensure that the directory entry still exists and has not
995 * changed while the new name has been entered. If the source is
996 * a file then the entry may have been unlinked or renamed. In
997 * either case there is no further work to be done. If the source
998 * is a directory then it cannot have been rmdir'ed; its link
999 * count of three would cause a rmdir to fail with ENOTEMPTY.
1000 * The IN_RENAME flag ensures that it cannot be moved by another
1001 * rename.
1002 */
1003 if (xp != ip) {
1004 /*
1005 * From name resolves to a different inode. IN_RENAME is
1006 * not sufficient protection against timing window races
1007 * so we can't panic here.
1008 */
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 /*
1161 * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
1162 * just redefine it - for this function only
1163 */
1164 #undef DIRBLKSIZ
1165 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1166 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1167 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
1168 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE,
1169 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1170 NULL, NULL);
1171 if (error) {
1172 dp->i_nlink--;
1173 dp->i_flag |= IN_CHANGE;
1174 goto bad;
1175 }
1176 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1177 /* XXX should grow with balloc() */
1178 panic("ext2_mkdir: blksize");
1179 else {
1180 ip->i_size = DIRBLKSIZ;
1181 ip->i_flag |= IN_CHANGE;
1182 }
1183
1184 /* Directory set up, now install its entry in the parent directory. */
1185 error = ext2_direnter(ip, dvp, cnp);
1186 if (error) {
1187 dp->i_nlink--;
1188 dp->i_flag |= IN_CHANGE;
1189 }
1190 bad:
1191 /*
1192 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1193 * for us because we set the link count to 0.
1194 */
1195 if (error) {
1196 ip->i_nlink = 0;
1197 ip->i_flag |= IN_CHANGE;
1198 vput(tvp);
1199 } else
1200 *ap->a_vpp = tvp;
1201 out:
1202 return (error);
1203 #undef DIRBLKSIZ
1204 #define DIRBLKSIZ DEV_BSIZE
1205 }
1206
1207 /*
1208 * Rmdir system call.
1209 */
1210 static int
1211 ext2_rmdir(struct vop_rmdir_args *ap)
1212 {
1213 struct vnode *vp = ap->a_vp;
1214 struct vnode *dvp = ap->a_dvp;
1215 struct componentname *cnp = ap->a_cnp;
1216 struct inode *ip, *dp;
1217 int error;
1218
1219 ip = VTOI(vp);
1220 dp = VTOI(dvp);
1221
1222 /*
1223 * Verify the directory is empty (and valid).
1224 * (Rmdir ".." won't be valid since
1225 * ".." will contain a reference to
1226 * the current directory and thus be
1227 * non-empty.)
1228 */
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 bufobj *bo;
1335 daddr_t blkno;
1336 int error;
1337
1338 if (vp->v_type == VBLK || vp->v_type == VCHR)
1339 panic("ext2_strategy: spec");
1340 if (bp->b_blkno == bp->b_lblkno) {
1341 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1342 bp->b_blkno = blkno;
1343 if (error) {
1344 bp->b_error = error;
1345 bp->b_ioflags |= BIO_ERROR;
1346 bufdone(bp);
1347 return (0);
1348 }
1349 if ((long)bp->b_blkno == -1)
1350 vfs_bio_clrbuf(bp);
1351 }
1352 if ((long)bp->b_blkno == -1) {
1353 bufdone(bp);
1354 return (0);
1355 }
1356 bp->b_iooffset = dbtob(bp->b_blkno);
1357 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1358 BO_STRATEGY(bo, bp);
1359 return (0);
1360 }
1361
1362 /*
1363 * Print out the contents of an inode.
1364 */
1365 static int
1366 ext2_print(struct vop_print_args *ap)
1367 {
1368 struct vnode *vp = ap->a_vp;
1369 struct inode *ip = VTOI(vp);
1370
1371 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
1372 if (vp->v_type == VFIFO)
1373 fifo_printinfo(vp);
1374 printf("\n");
1375 return (0);
1376 }
1377
1378 /*
1379 * Close wrapper for fifos.
1380 *
1381 * Update the times on the inode then do device close.
1382 */
1383 static int
1384 ext2fifo_close(struct vop_close_args *ap)
1385 {
1386 struct vnode *vp = ap->a_vp;
1387
1388 VI_LOCK(vp);
1389 if (vp->v_usecount > 1)
1390 ext2_itimes_locked(vp);
1391 VI_UNLOCK(vp);
1392 return (fifo_specops.vop_close(ap));
1393 }
1394
1395 /*
1396 * Kqfilter wrapper for fifos.
1397 *
1398 * Fall through to ext2 kqfilter routines if needed
1399 */
1400 static int
1401 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1402 {
1403 int error;
1404
1405 error = fifo_specops.vop_kqfilter(ap);
1406 if (error)
1407 error = vfs_kqfilter(ap);
1408 return (error);
1409 }
1410
1411 /*
1412 * Return POSIX pathconf information applicable to ext2 filesystems.
1413 */
1414 static int
1415 ext2_pathconf(struct vop_pathconf_args *ap)
1416 {
1417 int error = 0;
1418
1419 switch (ap->a_name) {
1420 case _PC_LINK_MAX:
1421 *ap->a_retval = EXT2_LINK_MAX;
1422 break;
1423 case _PC_NAME_MAX:
1424 *ap->a_retval = NAME_MAX;
1425 break;
1426 case _PC_PATH_MAX:
1427 *ap->a_retval = PATH_MAX;
1428 break;
1429 case _PC_PIPE_BUF:
1430 *ap->a_retval = PIPE_BUF;
1431 break;
1432 case _PC_CHOWN_RESTRICTED:
1433 *ap->a_retval = 1;
1434 break;
1435 case _PC_NO_TRUNC:
1436 *ap->a_retval = 1;
1437 break;
1438 case _PC_MIN_HOLE_SIZE:
1439 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1440 break;
1441 case _PC_ASYNC_IO:
1442 /* _PC_ASYNC_IO should have been handled by upper layers. */
1443 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
1444 error = EINVAL;
1445 break;
1446 case _PC_PRIO_IO:
1447 *ap->a_retval = 0;
1448 break;
1449 case _PC_SYNC_IO:
1450 *ap->a_retval = 0;
1451 break;
1452 case _PC_ALLOC_SIZE_MIN:
1453 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1454 break;
1455 case _PC_FILESIZEBITS:
1456 *ap->a_retval = 64;
1457 break;
1458 case _PC_REC_INCR_XFER_SIZE:
1459 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1460 break;
1461 case _PC_REC_MAX_XFER_SIZE:
1462 *ap->a_retval = -1; /* means ``unlimited'' */
1463 break;
1464 case _PC_REC_MIN_XFER_SIZE:
1465 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1466 break;
1467 case _PC_REC_XFER_ALIGN:
1468 *ap->a_retval = PAGE_SIZE;
1469 break;
1470 case _PC_SYMLINK_MAX:
1471 *ap->a_retval = MAXPATHLEN;
1472 break;
1473
1474 default:
1475 error = EINVAL;
1476 break;
1477 }
1478 return (error);
1479 }
1480
1481 /*
1482 * Vnode pointer to File handle
1483 */
1484 /* ARGSUSED */
1485 static int
1486 ext2_vptofh(struct vop_vptofh_args *ap)
1487 {
1488 struct inode *ip;
1489 struct ufid *ufhp;
1490
1491 ip = VTOI(ap->a_vp);
1492 ufhp = (struct ufid *)ap->a_fhp;
1493 ufhp->ufid_len = sizeof(struct ufid);
1494 ufhp->ufid_ino = ip->i_number;
1495 ufhp->ufid_gen = ip->i_gen;
1496 return (0);
1497 }
1498
1499 /*
1500 * Initialize the vnode associated with a new inode, handle aliased
1501 * vnodes.
1502 */
1503 int
1504 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1505 {
1506 struct inode *ip;
1507 struct vnode *vp;
1508
1509 vp = *vpp;
1510 ip = VTOI(vp);
1511 vp->v_type = IFTOVT(ip->i_mode);
1512 if (vp->v_type == VFIFO)
1513 vp->v_op = fifoops;
1514
1515 if (ip->i_number == EXT2_ROOTINO)
1516 vp->v_vflag |= VV_ROOT;
1517 ip->i_modrev = init_va_filerev();
1518 *vpp = vp;
1519 return (0);
1520 }
1521
1522 /*
1523 * Allocate a new inode.
1524 */
1525 static int
1526 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1527 struct componentname *cnp)
1528 {
1529 struct inode *ip, *pdir;
1530 struct vnode *tvp;
1531 int error;
1532
1533 pdir = VTOI(dvp);
1534 #ifdef INVARIANTS
1535 if ((cnp->cn_flags & HASBUF) == 0)
1536 panic("ext2_makeinode: no name");
1537 #endif
1538 *vpp = NULL;
1539 if ((mode & IFMT) == 0)
1540 mode |= IFREG;
1541
1542 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1543 if (error) {
1544 return (error);
1545 }
1546 ip = VTOI(tvp);
1547 ip->i_gid = pdir->i_gid;
1548 #ifdef SUIDDIR
1549 {
1550 /*
1551 * if we are
1552 * not the owner of the directory,
1553 * and we are hacking owners here, (only do this where told to)
1554 * and we are not giving it TOO root, (would subvert quotas)
1555 * then go ahead and give it to the other user.
1556 * Note that this drops off the execute bits for security.
1557 */
1558 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1559 (pdir->i_mode & ISUID) &&
1560 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1561 ip->i_uid = pdir->i_uid;
1562 mode &= ~07111;
1563 } else {
1564 ip->i_uid = cnp->cn_cred->cr_uid;
1565 }
1566 }
1567 #else
1568 ip->i_uid = cnp->cn_cred->cr_uid;
1569 #endif
1570 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1571 ip->i_mode = mode;
1572 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1573 ip->i_nlink = 1;
1574 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1575 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
1576 ip->i_mode &= ~ISGID;
1577 }
1578
1579 if (cnp->cn_flags & ISWHITEOUT)
1580 ip->i_flags |= UF_OPAQUE;
1581
1582 /*
1583 * Make sure inode goes to disk before directory entry.
1584 */
1585 error = ext2_update(tvp, !DOINGASYNC(tvp));
1586 if (error)
1587 goto bad;
1588 error = ext2_direnter(ip, dvp, cnp);
1589 if (error)
1590 goto bad;
1591
1592 *vpp = tvp;
1593 return (0);
1594
1595 bad:
1596 /*
1597 * Write error occurred trying to update the inode
1598 * or the directory so must deallocate the inode.
1599 */
1600 ip->i_nlink = 0;
1601 ip->i_flag |= IN_CHANGE;
1602 vput(tvp);
1603 return (error);
1604 }
1605
1606 /*
1607 * Vnode op for reading.
1608 */
1609 static int
1610 ext2_read(struct vop_read_args *ap)
1611 {
1612 struct vnode *vp;
1613 struct inode *ip;
1614 int error;
1615
1616 vp = ap->a_vp;
1617 ip = VTOI(vp);
1618
1619 /* EXT4_EXT_LOCK(ip); */
1620 if (ip->i_flag & IN_E4EXTENTS)
1621 error = ext4_ext_read(ap);
1622 else
1623 error = ext2_ind_read(ap);
1624 /* EXT4_EXT_UNLOCK(ip); */
1625 return (error);
1626 }
1627
1628 /*
1629 * Vnode op for reading.
1630 */
1631 static int
1632 ext2_ind_read(struct vop_read_args *ap)
1633 {
1634 struct vnode *vp;
1635 struct inode *ip;
1636 struct uio *uio;
1637 struct m_ext2fs *fs;
1638 struct buf *bp;
1639 daddr_t lbn, nextlbn;
1640 off_t bytesinfile;
1641 long size, xfersize, blkoffset;
1642 int error, orig_resid, seqcount;
1643 int ioflag;
1644
1645 vp = ap->a_vp;
1646 uio = ap->a_uio;
1647 ioflag = ap->a_ioflag;
1648
1649 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
1650 ip = VTOI(vp);
1651
1652 #ifdef INVARIANTS
1653 if (uio->uio_rw != UIO_READ)
1654 panic("%s: mode", "ext2_read");
1655
1656 if (vp->v_type == VLNK) {
1657 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
1658 panic("%s: short symlink", "ext2_read");
1659 } else if (vp->v_type != VREG && vp->v_type != VDIR)
1660 panic("%s: type %d", "ext2_read", vp->v_type);
1661 #endif
1662 orig_resid = uio->uio_resid;
1663 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
1664 if (orig_resid == 0)
1665 return (0);
1666 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
1667 fs = ip->i_e2fs;
1668 if (uio->uio_offset < ip->i_size &&
1669 uio->uio_offset >= fs->e2fs_maxfilesize)
1670 return (EOVERFLOW);
1671
1672 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
1673 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1674 break;
1675 lbn = lblkno(fs, uio->uio_offset);
1676 nextlbn = lbn + 1;
1677 size = blksize(fs, ip, lbn);
1678 blkoffset = blkoff(fs, uio->uio_offset);
1679
1680 xfersize = fs->e2fs_fsize - blkoffset;
1681 if (uio->uio_resid < xfersize)
1682 xfersize = uio->uio_resid;
1683 if (bytesinfile < xfersize)
1684 xfersize = bytesinfile;
1685
1686 if (lblktosize(fs, nextlbn) >= ip->i_size)
1687 error = bread(vp, lbn, size, NOCRED, &bp);
1688 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
1689 error = cluster_read(vp, ip->i_size, lbn, size,
1690 NOCRED, blkoffset + uio->uio_resid, seqcount,
1691 0, &bp);
1692 } else if (seqcount > 1) {
1693 u_int nextsize = blksize(fs, ip, nextlbn);
1694
1695 error = breadn(vp, lbn,
1696 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
1697 } else
1698 error = bread(vp, lbn, size, NOCRED, &bp);
1699 if (error) {
1700 brelse(bp);
1701 bp = NULL;
1702 break;
1703 }
1704
1705 /*
1706 * If IO_DIRECT then set B_DIRECT for the buffer. This
1707 * will cause us to attempt to release the buffer later on
1708 * and will cause the buffer cache to attempt to free the
1709 * underlying pages.
1710 */
1711 if (ioflag & IO_DIRECT)
1712 bp->b_flags |= B_DIRECT;
1713
1714 /*
1715 * We should only get non-zero b_resid when an I/O error
1716 * has occurred, which should cause us to break above.
1717 * However, if the short read did not cause an error,
1718 * then we want to ensure that we do not uiomove bad
1719 * or uninitialized data.
1720 */
1721 size -= bp->b_resid;
1722 if (size < xfersize) {
1723 if (size == 0)
1724 break;
1725 xfersize = size;
1726 }
1727 error = uiomove((char *)bp->b_data + blkoffset,
1728 (int)xfersize, uio);
1729 if (error)
1730 break;
1731
1732 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1733 /*
1734 * If it's VMIO or direct I/O, then we don't
1735 * need the buf, mark it available for
1736 * freeing. If it's non-direct VMIO, the VM has
1737 * the data.
1738 */
1739 bp->b_flags |= B_RELBUF;
1740 brelse(bp);
1741 } else {
1742 /*
1743 * Otherwise let whoever
1744 * made the request take care of
1745 * freeing it. We just queue
1746 * it onto another list.
1747 */
1748 bqrelse(bp);
1749 }
1750 }
1751
1752 /*
1753 * This can only happen in the case of an error because the loop
1754 * above resets bp to NULL on each iteration and on normal
1755 * completion has not set a new value into it. so it must have come
1756 * from a 'break' statement
1757 */
1758 if (bp != NULL) {
1759 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1760 bp->b_flags |= B_RELBUF;
1761 brelse(bp);
1762 } else {
1763 bqrelse(bp);
1764 }
1765 }
1766
1767 if ((error == 0 || uio->uio_resid != orig_resid) &&
1768 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
1769 ip->i_flag |= IN_ACCESS;
1770 return (error);
1771 }
1772
1773 static int
1774 ext2_ioctl(struct vop_ioctl_args *ap)
1775 {
1776
1777 switch (ap->a_command) {
1778 case FIOSEEKDATA:
1779 case FIOSEEKHOLE:
1780 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
1781 (off_t *)ap->a_data, ap->a_cred));
1782 default:
1783 return (ENOTTY);
1784 }
1785 }
1786
1787 /*
1788 * this function handles ext4 extents block mapping
1789 */
1790 static int
1791 ext4_ext_read(struct vop_read_args *ap)
1792 {
1793 static unsigned char zeroes[EXT2_MAX_BLOCK_SIZE];
1794 struct vnode *vp;
1795 struct inode *ip;
1796 struct uio *uio;
1797 struct m_ext2fs *fs;
1798 struct buf *bp;
1799 struct ext4_extent nex, *ep;
1800 struct ext4_extent_path path;
1801 daddr_t lbn, newblk;
1802 off_t bytesinfile;
1803 int cache_type;
1804 ssize_t orig_resid;
1805 int error;
1806 long size, xfersize, blkoffset;
1807
1808 vp = ap->a_vp;
1809 ip = VTOI(vp);
1810 uio = ap->a_uio;
1811 memset(&path, 0, sizeof(path));
1812
1813 orig_resid = uio->uio_resid;
1814 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__));
1815 if (orig_resid == 0)
1816 return (0);
1817 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__));
1818 fs = ip->i_e2fs;
1819 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize)
1820 return (EOVERFLOW);
1821
1822 while (uio->uio_resid > 0) {
1823 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1824 break;
1825 lbn = lblkno(fs, uio->uio_offset);
1826 size = blksize(fs, ip, lbn);
1827 blkoffset = blkoff(fs, uio->uio_offset);
1828
1829 xfersize = fs->e2fs_fsize - blkoffset;
1830 xfersize = MIN(xfersize, uio->uio_resid);
1831 xfersize = MIN(xfersize, bytesinfile);
1832
1833 /* get block from ext4 extent cache */
1834 cache_type = ext4_ext_in_cache(ip, lbn, &nex);
1835 switch (cache_type) {
1836 case EXT4_EXT_CACHE_NO:
1837 ext4_ext_find_extent(fs, ip, lbn, &path);
1838 if (path.ep_is_sparse)
1839 ep = &path.ep_sparse_ext;
1840 else
1841 ep = path.ep_ext;
1842 if (ep == NULL)
1843 return (EIO);
1844
1845 ext4_ext_put_cache(ip, ep,
1846 path.ep_is_sparse ? EXT4_EXT_CACHE_GAP : EXT4_EXT_CACHE_IN);
1847
1848 newblk = lbn - ep->e_blk + (ep->e_start_lo |
1849 (daddr_t)ep->e_start_hi << 32);
1850
1851 if (path.ep_bp != NULL) {
1852 brelse(path.ep_bp);
1853 path.ep_bp = NULL;
1854 }
1855 break;
1856
1857 case EXT4_EXT_CACHE_GAP:
1858 /* block has not been allocated yet */
1859 break;
1860
1861 case EXT4_EXT_CACHE_IN:
1862 newblk = lbn - nex.e_blk + (nex.e_start_lo |
1863 (daddr_t)nex.e_start_hi << 32);
1864 break;
1865
1866 default:
1867 panic("%s: invalid cache type", __func__);
1868 }
1869
1870 if (cache_type == EXT4_EXT_CACHE_GAP ||
1871 (cache_type == EXT4_EXT_CACHE_NO && path.ep_is_sparse)) {
1872 if (xfersize > sizeof(zeroes))
1873 xfersize = sizeof(zeroes);
1874 error = uiomove(zeroes, xfersize, uio);
1875 if (error)
1876 return (error);
1877 } else {
1878 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size,
1879 NOCRED, &bp);
1880 if (error) {
1881 brelse(bp);
1882 return (error);
1883 }
1884
1885 size -= bp->b_resid;
1886 if (size < xfersize) {
1887 if (size == 0) {
1888 bqrelse(bp);
1889 break;
1890 }
1891 xfersize = size;
1892 }
1893 error = uiomove(bp->b_data + blkoffset, xfersize, uio);
1894 bqrelse(bp);
1895 if (error)
1896 return (error);
1897 }
1898 }
1899
1900 return (0);
1901 }
1902
1903 /*
1904 * Vnode op for writing.
1905 */
1906 static int
1907 ext2_write(struct vop_write_args *ap)
1908 {
1909 struct vnode *vp;
1910 struct uio *uio;
1911 struct inode *ip;
1912 struct m_ext2fs *fs;
1913 struct buf *bp;
1914 daddr_t lbn;
1915 off_t osize;
1916 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
1917
1918 ioflag = ap->a_ioflag;
1919 uio = ap->a_uio;
1920 vp = ap->a_vp;
1921
1922 seqcount = ioflag >> IO_SEQSHIFT;
1923 ip = VTOI(vp);
1924
1925 #ifdef INVARIANTS
1926 if (uio->uio_rw != UIO_WRITE)
1927 panic("%s: mode", "ext2_write");
1928 #endif
1929
1930 switch (vp->v_type) {
1931 case VREG:
1932 if (ioflag & IO_APPEND)
1933 uio->uio_offset = ip->i_size;
1934 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
1935 return (EPERM);
1936 /* FALLTHROUGH */
1937 case VLNK:
1938 break;
1939 case VDIR:
1940 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
1941 if ((ioflag & IO_SYNC) == 0)
1942 panic("ext2_write: nonsync dir write");
1943 break;
1944 default:
1945 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
1946 vp->v_type, (intmax_t)uio->uio_offset,
1947 (intmax_t)uio->uio_resid);
1948 }
1949
1950 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
1951 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
1952 fs = ip->i_e2fs;
1953 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
1954 return (EFBIG);
1955 /*
1956 * Maybe this should be above the vnode op call, but so long as
1957 * file servers have no limits, I don't think it matters.
1958 */
1959 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
1960 return (EFBIG);
1961
1962 resid = uio->uio_resid;
1963 osize = ip->i_size;
1964 if (seqcount > BA_SEQMAX)
1965 flags = BA_SEQMAX << BA_SEQSHIFT;
1966 else
1967 flags = seqcount << BA_SEQSHIFT;
1968 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
1969 flags |= IO_SYNC;
1970
1971 for (error = 0; uio->uio_resid > 0;) {
1972 lbn = lblkno(fs, uio->uio_offset);
1973 blkoffset = blkoff(fs, uio->uio_offset);
1974 xfersize = fs->e2fs_fsize - blkoffset;
1975 if (uio->uio_resid < xfersize)
1976 xfersize = uio->uio_resid;
1977 if (uio->uio_offset + xfersize > ip->i_size)
1978 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
1979
1980 /*
1981 * We must perform a read-before-write if the transfer size
1982 * does not cover the entire buffer.
1983 */
1984 if (fs->e2fs_bsize > xfersize)
1985 flags |= BA_CLRBUF;
1986 else
1987 flags &= ~BA_CLRBUF;
1988 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
1989 ap->a_cred, &bp, flags);
1990 if (error != 0)
1991 break;
1992
1993 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
1994 bp->b_flags |= B_NOCACHE;
1995 if (uio->uio_offset + xfersize > ip->i_size)
1996 ip->i_size = uio->uio_offset + xfersize;
1997 size = blksize(fs, ip, lbn) - bp->b_resid;
1998 if (size < xfersize)
1999 xfersize = size;
2000
2001 error =
2002 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
2003 /*
2004 * If the buffer is not already filled and we encounter an
2005 * error while trying to fill it, we have to clear out any
2006 * garbage data from the pages instantiated for the buffer.
2007 * If we do not, a failed uiomove() during a write can leave
2008 * the prior contents of the pages exposed to a userland mmap.
2009 *
2010 * Note that we need only clear buffers with a transfer size
2011 * equal to the block size because buffers with a shorter
2012 * transfer size were cleared above by the call to ext2_balloc()
2013 * with the BA_CLRBUF flag set.
2014 *
2015 * If the source region for uiomove identically mmaps the
2016 * buffer, uiomove() performed the NOP copy, and the buffer
2017 * content remains valid because the page fault handler
2018 * validated the pages.
2019 */
2020 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2021 fs->e2fs_bsize == xfersize)
2022 vfs_bio_clrbuf(bp);
2023 if (ioflag & (IO_VMIO|IO_DIRECT)) {
2024 bp->b_flags |= B_RELBUF;
2025 }
2026
2027 /*
2028 * If IO_SYNC each buffer is written synchronously. Otherwise
2029 * if we have a severe page deficiency write the buffer
2030 * asynchronously. Otherwise try to cluster, and if that
2031 * doesn't do it then either do an async write (if O_DIRECT),
2032 * or a delayed write (if not).
2033 */
2034 if (ioflag & IO_SYNC) {
2035 (void)bwrite(bp);
2036 } else if (vm_page_count_severe() ||
2037 buf_dirty_count_severe() ||
2038 (ioflag & IO_ASYNC)) {
2039 bp->b_flags |= B_CLUSTEROK;
2040 bawrite(bp);
2041 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2042 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2043 bp->b_flags |= B_CLUSTEROK;
2044 cluster_write(vp, bp, ip->i_size, seqcount, 0);
2045 } else {
2046 bawrite(bp);
2047 }
2048 } else if (ioflag & IO_DIRECT) {
2049 bp->b_flags |= B_CLUSTEROK;
2050 bawrite(bp);
2051 } else {
2052 bp->b_flags |= B_CLUSTEROK;
2053 bdwrite(bp);
2054 }
2055 if (error || xfersize == 0)
2056 break;
2057 }
2058 /*
2059 * If we successfully wrote any data, and we are not the superuser
2060 * we clear the setuid and setgid bits as a precaution against
2061 * tampering.
2062 */
2063 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2064 ap->a_cred) {
2065 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
2066 ip->i_mode &= ~(ISUID | ISGID);
2067 }
2068 if (error) {
2069 if (ioflag & IO_UNIT) {
2070 (void)ext2_truncate(vp, osize,
2071 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2072 uio->uio_offset -= resid - uio->uio_resid;
2073 uio->uio_resid = resid;
2074 }
2075 }
2076 if (uio->uio_resid != resid) {
2077 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2078 if (ioflag & IO_SYNC)
2079 error = ext2_update(vp, 1);
2080 }
2081 return (error);
2082 }
Cache object: 44c5c83d3f751e74b3151a1db57b084a
|